# Patent

## Title
Rotary engine lip-seal apparatus and method of operation therefor

## Abstract

The invention comprises a rotary engine method and apparatus configured with a lip seal. A lip seal restricts fuel flow from a fuel compartment to a non-fuel compartment and/or fuel flow between fuel chambers, such as between a reference expansion chamber and any of an engine: rotor, vane, housing, and/or a leading or trailing expansion chamber. In separate states, high pressure and low pressure force sealing movement of the lip seal, respectively. The lip seal is optionally used in combination with a cap seal to form a dynamic seal. The dynamic seals ability to track a noncircular path are particularly beneficial for use in a rotary engine having an offset rotor and with a non-circular inner rotary engine compartment having engine wall cut-outs and/or build-ups. The dynamic sealing forces further provide cap sealing forces over a range of temperatures, pressures, fuel flow rates, varying loads, and operating engine rotation rates.

## Background
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. patent application Ser. No. 13/069,165 filed Mar. 22, 2011, which:

    
    
        is a continuation-in-part of U.S. patent application Ser. No. 13/042,744 filed Mar. 8, 2011;
        is a continuation-in-part of U.S. patent application Ser. No. 13/031,228 filed Feb. 20, 2011;
        is a continuation-in-part of U.S. patent application Ser. No. 13/031,190 filed Feb. 19, 2011;
        is a continuation-in-part of U.S. patent application Ser. No. 13/041,368 filed Mar. 5, 2011, which is a continuation-in-part of U.S. patent application Ser. No. 13/031,755 filed Feb. 22, 2011, which is a continuation-in-part of U.S. patent application Ser. No. 13/014,167 filed Jan. 26, 2011, which
        
            is a continuation-in-part of U.S. patent application Ser. No. 12/705,731 filed Feb. 15, 2010, which is a continuation of U.S. patent application Ser. No. 11/388,361 filed Mar. 24, 2006, now U.S. Pat. No. 7,694,520, which is a continuation-in-part of U.S. patent application Ser. No. 11/077,289 filed Mar. 9, 2005, now U.S. Pat. No. 7,055,327;
            claims the benefit of U.S. provisional patent application No. 61/304,462 filed Feb. 14, 2010;
            claims the benefit of U.S. provisional patent application No. 61/311,319 filed Mar. 6, 2010;
            claims the benefit of U.S. provisional patent application No. 61/316,164 filed Mar. 22, 2010;
            claims the benefit of U.S. provisional patent application No. 61/316,241 filed Mar. 22, 2010;
            claims the benefit of U.S. provisional patent application No. 61/316,718 filed Mar. 23, 2010;
            claims the benefit of U.S. provisional patent application No. 61/323,138 filed Apr. 12, 2010; and
            claims the benefit of U.S. provisional patent application No. 61/330,355 filed May 2, 2010,
        
        
        all of which are incorporated herein in their entirety by this reference thereto.
    
    




TECHNICAL FIELD OF THE INVENTION
The present invention relates to the field of rotary engines. More specifically, the present invention relates to the field of rotary engines having a lip seal.
BACKGROUND OF THE INVENTION
The controlled expansion of gases forms the basis for the majority of non-electrical rotational engines in use today. These engines include reciprocating, rotary, and turbine engines, and may be driven by heat, such as with heat engines, or other forms of energy. Heat engines optionally use combustion, solar, geothermal, nuclear, and/or forms of thermal energy. Further, combustion-based heat engines optionally utilize either an internal or an external combustion system, which are further described infra.
Internal Combustion Engines
Internal combustion engines derive power from the combustion of a fuel within the engine itself. Typical internal combustion engines include reciprocating engines, rotary engines, and turbine engines.
Internal combustion reciprocating engines convert the expansion of burning gases, such as an air-fuel mixture, into the linear movement of pistons within cylinders. This linear movement is subsequently converted into rotational movement through connecting rods and a crankshaft. Examples of internal combustion reciprocating engines are the common automotive gasoline and diesel engines.
Internal combustion rotary engines use rotors and chambers to more directly convert the expansion of burning gases into rotational movement. An example of an internal combustion rotary engine is a Wankel engine, which utilizes a triangular rotor that revolves in a chamber, instead of pistons within cylinders. The Wankel engine has fewer moving parts and is generally smaller and lighter, for a given power output, than an equivalent internal combustion reciprocating engine.
Internal combustion turbine engines direct the expansion of burning gases against a turbine, which subsequently rotates. An example of an internal combustion turbine engine is a turboprop aircraft engine, in which the turbine is coupled to a propeller to provide motive power for the aircraft.
Internal combustion turbine engines are often used as thrust engines, where the expansion of the burning gases exit the engine in a controlled manner to produce thrust. An example of an internal combustion turbine/thrust engine is the turbofan aircraft engine, in which the rotation of the turbine is typically coupled back to a compressor, which increases the pressure of the air in the air-fuel mixture and increases the resultant thrust.
All internal combustion engines suffer from poor efficiency; only a small percentage of the potential energy is released during combustion as the combustion is invariably incomplete. Of energy released in combustion, only a small percentage is converted into rotational energy while the rest is dissipated as heat.
If the fuel used in an internal combustion engine is a typical hydrocarbon or hydrocarbon-based compound, such as gasoline, diesel oil, and/or jet fuel, then the partial combustion characteristic of internal combustion engines causes the release of a range of combustion by-product pollutants into the atmosphere via an engine exhaust. To reduce the quantity of pollutants, a support system including a catalytic converter and other apparatus is typically necessitated. Even with the support system, a significant quantity of pollutants are released into the atmosphere as a result of incomplete combustion when using an internal combustion engine.
Because internal combustion engines depend upon the rapid and explosive combustion of fuel within the engine itself, the engine must be engineered to withstand a considerable amount of heat and pressure. These are drawbacks that require a more robust and more complex engine compared to external combustion engines of similar power output.
External Combustion Engines
External combustion engines derive power from the combustion of a fuel in a combustion chamber separate from the engine. A Rankine-cycle engine typifies a modern external combustion engine. In a Rankine-cycle engine, fuel is burned in the combustion chamber and used to heat a liquid at substantially constant pressure. The liquid is vaporized to a gas, which is passed into the engine where it expands. The desired rotational energy and/or power is derived from the expansion energy of the gas. Typical external combustion engines also include reciprocating engines, rotary engines, and turbine engines, described infra.
External combustion reciprocating engines convert the expansion of heated gases into the linear movement of pistons within cylinders and the linear movement is subsequently converted into rotational movement through linkages. A conventional steam locomotive engine is used to illustrate functionality of an external combustion open-loop Rankine-cycle reciprocating engine. Fuel, such as wood, coal, or oil, is burned in a combustion chamber or firebox of the locomotive and is used to heat water at a substantially constant pressure. The water is vaporized to a gas or steam form and is passed into the cylinders. The expansion of the gas in the cylinders drives the pistons. Linkages or drive rods transform the piston movement into rotary power that is coupled to the wheels of a locomotive and is used to propel the locomotive down the track. The expanded gas is released into the atmosphere in the form of steam.
External combustion rotary engines use rotors and chambers instead of pistons, cylinders, and linkages to more directly convert the expansion of heated gases into rotational movement.
External combustion turbine engines direct the expansion of heated gases against a turbine, which then rotates. A modern nuclear power plant is an example of an external-combustion closed-loop Rankine-cycle turbine engine. Nuclear fuel is consumed in a combustion chamber known as a reactor and the resultant energy release is used to heat water. The water is vaporized to a gas, such as steam, which is directed against a turbine forcing rotation. The rotation of the turbine drives a generator to produce electricity. The expanded steam is then condensed back into water and is typically made available for reheating.
With proper design, external combustion engines are more efficient than corresponding internal combustion engines. Through the use of a combustion chamber, the fuel is more thoroughly consumed, releasing a greater percentage of the potential energy. Further, more thorough consumption means fewer combustion by-products with a corresponding reduction in pollutants.
Because external combustion engines do not themselves encompass the combustion of fuel, they are optionally engineered to operate at a lower pressure and a lower temperature than comparable internal combustion engines, which allows the use of less complex support systems, such as cooling and exhaust systems. The result is external combustion engines that are simpler and lighter for a given power output compared with internal combustion engines.
External Combustion Engine Types
Turbine Engines
Typical turbine engines operate at high rotational speeds. The high rotational speeds present several engineering challenges that typically result in specialized designs and materials, which adds to system complexity and cost. Further, to operate at low-to-moderate rotational speeds, turbine engines typically utilize a step-down transmission of some sort, which again adds to system complexity and cost.
Reciprocating Engines
Similarly, reciprocating engines require linkages to convert linear motion to rotary motion resulting in complex designs with many moving parts. In addition, the linear motion of the pistons and the motions of the linkages produce significant vibration, which results in a loss of efficiency and a decrease in engine life. To compensate, components are typically counterbalanced to reduce vibration, which again increases both design complexity and cost.
Heat Engines
Typical heat engines depend upon the diabatic expansion of a gas. That is, as the gas expands, it loses heat. This diabatic expansion represents a loss of energy.
Patents and patent applications related to the current invention are summarized here.
Rotary Engine Types
J. Faucett, “Improvement in Rotary Engines”, U.S. Pat. No. 122,713 (Jan. 16, 1872) describes a class of rotary steam engines using a revolving disk instead of a piston. Particularly, the engine uses a pair of oval concentrics secured to a single transverse shaft, each revolving within a separate steam chamber.
L. Kramer, “Sliding-Vane Rotary Fluid Displacement Machine”, U.S. Pat. No. 3,539,281 (Nov. 10, 1970) describes a sliding-vane rotary fluid displacement machine having a rotor carrying a plurality of sliding vanes that positively move outward as the rotor rotates. The rotor and vanes are surrounded by a cylinder that rotates with the rotor and vanes about an axis.
R. Hoffman, “Rotary Steam Engine”, U.S. Pat. No. 4,047,856 (Sep. 13, 1977) describes a unidirectional rotary steam power unit using a power fluid supplied through a hollow rotor and is conducted to working chambers using passages in walls of the housing controlled by seal means carried by the rotor.
D. Larson, “Rotary Internal Combustion Engine”, U.S. Pat. No. 4,178,900 (Dec. 18, 1979) describes a rotary internal combustion engine configured with a stator and two pairs of sockets. Wedges are affixed to each socket. Rotation of an inner rotor, the sides of the rotor defining a cam, allows pivoting of the wedges, which alters chamber sizes between the rotor and the stator.
J. Ramer, “Method for Operating a Rotary Engine”, U.S. Pat. No. 4,203,410 (May 20, 1980) describes a rotary engine having a pair of spaced coaxial rotors in a housing, each rotor rotating separate rotor chambers. An axially extending chamber in the housing communicates the rotor chambers.
F. Lowther, “Vehicle Braking and Kinetic Energy Recovery System”, U.S. Pat. No. 4,290,268 (Sep. 22, 1981) describes an auxiliary kinetic energy recovery system incorporating a rotary sliding vane engine and/or compressor, using compressed air or electrical energy recovered from the kinetic energy of the braking system, with controls including the regulation of the inlet aperture.
O. Rosaen, “Rotary Engine”, U.S. Pat. No. 4,353,337 (Oct. 12, 1982) describes a rotary internal combustion engine having an elliptically formed internal chamber, with a plurality of vane members slidably disposed within the rotor, constructed to ensure a sealing engagement between the vane member and the wall surface.
J. Herrero, et. al., “Rotary Electrohydraulic Device With Axially Sliding Vanes”, U.S. Pat. No. 4,492,541 (Jan. 8, 1985) describes a rotary electrohydraulic device applicable as a braking or slackening device.
O. Lien, “Rotary Engine”, U.S. Pat. No. 4,721,079 (Jan. 26, 1988) describes a rotary engine configured with rotors, forming opposite sides of the combustion chambers, rotated on an angled, non-rotatable shaft through which a straight power shaft passes.
K. Yang, “Rotary Engine”, U.S. Pat. No. 4,813,388 (Mar. 21, 1989) describes an engine having a pair of cylindrical hubs interleaved in a mesh type rotary engine, each of the cylindrical hubs defining combustion and expansion chambers.
A. Nardi, “Rotary Expander”, U.S. Pat. No. 5,039,290 (Aug. 13, 1991) describes a positive displacement single expansion steam engine having cylinder heads fixed to a wall of the engine, a rotatable power shaft having a plurality of nests, and a free-floating piston in each nest.
G. Testea, et. al., “Rotary Engine System”, U.S. Pat. No. 5,235,945 (Aug. 17, 1993) describes an internal combustion rotary engine having an offset rotor for rotation about an axis eccentric to a central axis of a cylindrical cavity that provides the working chambers of the engine.
R. Weatherston, “Two Rotor Sliding Vane Compressor”, U.S. Pat. No. 5,681,153 (Oct. 28, 1997) describes a two-rotor sliding member rotary compressor including an inner rotor, an outer rotor eccentric to the inner rotor, and at least three sliding members between the inner rotor and the outer rotor.
G. Round, et. al., “Rotary Engine and Method of Operation”, U.S. Pat. No. 5,720,251 (Feb. 24, 1998) describes a rotary engine having an inner rotor and an outer rotor with the outer rotor being offset from the inner rotor. The outer rotor is configured with inward projecting lobes forming seals with outward extending radial arms of the inner rotor, the lobes and arms forming chambers of the engine.
J. Klassen, “Rotary Positive Displacement Engine”, U.S. Pat. No. 5,755,196 (May 26, 1998) describes an engine having a pair of rotors both housed within a single housing, where each rotor is mounted on an axis extending through a center of the housing, where the rotors interlock with each other to define chambers, where a contact face of a first rotor is defined by rotation of a conical section of a second rotor of the two rotors, such that there is a constant linear contact between opposing vanes on the two rotors.
M. Ichieda, “Side Pressure Type Rotary Engine”, U.S. Pat. No. 5,794,583 (Aug. 18, 1998) describes a side pressure type rotary engine configured with a suction port and an exhaust port. A suction blocking element and exhaust blocking element are timed for movement and use in synchronization with rotor rotation to convert expansive forces into a rotational force.
R. Saint-Hilaire, et. al. “Quasiturbine Zero Vibration-Continuous Combustion Rotary Engine Compressor or Pump”, U.S. Pat. No. 6,164,263 (Dec. 26, 2000) describe a rotary engine using four degrees of freedom, where an assembly of four carriages, supporting pivots of four pivoting blades, forms a variable shape rotor.
J. Pelleja, “Rotary Internal Combustion Engine and Rotary Internal Combustion Engine Cycle”, U.S. Pat. No. 6,247,443 B1 (Jun. 19, 2001) describes an internal combustion rotary engine configured with a set of push rod vanes arranged in a staggered and radial arrangement relative to a drive shaft of the engine.
R. Pekau, “Variable Geometry Toroidal Engine”, U.S. Pat. No. 6,546,908 B1 (Apr. 15, 2003) describes a rotary engine including a single toroidal cylinder and a set of pistons on a rotating circular piston assembly where the pistons are mechanically extendable and retractable in synchronization with opening and closing of a disk valve.
M. King, “Variable Vane Rotary Engine”, U.S. Pat. No. 6,729,296 B2 (May 4, 2004) describes a rotary engine including: (1) a concentric stator sandwiched between a front wall and an aft wall enclosing a cylindrical inner space and (2) a network of combustors stationed about the periphery of the stator.
O. Al-Hawaj, “Supercharged Radial Vane Rotary Device”, U.S. Pat. No. 6,772,728 B2 (Aug. 10, 2004) describes two and four phase internal combustion engines having a doughnut shaped rotor assembly with an integrated axial pump portion.
M. Kight, “Bimodal Fan, Heat Exchanger and Bypass Air Supercharging for Piston or Rotary Driven Turbine”, U.S. Pat. No. 6,786,036 B2 (Sep. 7, 2004) describes a turbine for aircraft use where the turbine includes a heat exchanger with minimal drag for increasing the engine effectiveness through an enthalpy increase on the working fluid.
A. Regev, “Rotary Vane Motor”, U.S. Pat. No. 6,886,527 B2 (May 3, 2005) describes a rotary vane motor using a pair of second order elliptical gears for controlling movement of vanes and to define an intake stage, a compression stage, an expansion stage, and an exhaust stage of the motor.
S. Wang, “Rotary Engine with Vanes Rotatable by Compressed Gas Injected Thereon”, U.S. Pat. No. 7,845,332 B2 (Dec. 7, 2010) describes a planetary gear rotary engine for internal combustion, where a rotor rotates within an outer shell. With a given rotation of the rotor, vanes drive a power generating unit.
Ignition
E. Pangman, “Multiple Vane Rotary Internal Combustion Engine”, U.S. Pat. No. 5,277,158 (Jan. 11, 1994) describes a rotary engine having a fuel ignition system provided to more than one combustion chamber at a time by expanding gases passing through a plasma bleed-over groove. Further exhaust gases are removed by a secondary system using a venturi creating negative pressure.
End Plates
S. Smart, et. al., “Rotary Vane Pump With Floating Rotor Side Plates”, U.S. Pat. No. 4,804,317 (Feb. 14, 1989) describes a rotary vane pump having a rotor within a cavity, a pair of stationary wear plates on the sides of the cavity, carbon composite vanes riding in the rotor and a pair of carbon composite rotor side plates positioned between one side of the rotor and the stationary end plates, the vanes having sufficient width to extend into slots of both side plates to drive the side plates with the rotor during operation.
Rotors
F. Bellmer, “Multi-Chamber Rotary Vane Compressor”, U.S. Pat. No. 3,381,891 (May 7, 1968) describes a rotary sliding vane compressor having multiple compression chambers circumferentially spaced within the rotor housing with groups of chambers serially connected to provide pressure staging.
Y. Ishizuka, et. al., “Sliding Vane Compressor with End Face Inserts or Rotor”, U.S. Pat. No. 4,242,065 (Dec. 30, 1980) describes a sliding vane compressor having a rotor, the rotor having axial endfaces, which are juxtaposed. The axial rotor endfaces having a material of higher thermal coefficient of expansion than a material of the rotor itself, the thermal expansion of the endfaces used to set a spacing.
T. Edwards, “Non-Contact Rotary Vane Gas Expanding Apparatus”, U.S. Pat. No. 5,501,586 (Mar. 26, 1991) describes a non-contact rotary vane gas expanding apparatus having a stator housing, a rotor, a plurality of vanes in radial slots of the rotor, a plurality of gas receiving pockets in the rotor adjacent to the radial slots of the rotor, and formations in the stator housing to effectuate transfer of gas under pressure through the stator housing to the gas receiving pockets.
J. Minier, “Rotary Internal Combustion Engine”, U.S. Pat. No. 6,070,565 (Jun. 6, 2000) describes an internal combustion engine apparatus containing a slotted yoke positioned for controlling the sliding of vane blades.
Vanes
H. Kalen, et. al., “Rotary Machines of the Sliding Vane Type Having Interconnected Vane Slots”, U.S. Pat. No. 3,915,598 (Oct. 28, 1975) describe a rotary machine of the sliding-vane type having a stator housing and a rotor operatively mounted therein, the rotor having vane slots to accommodate sliding vanes with a series of channels in the rotor body interconnecting the vane slots.
R. Jenkins, et. al., “Rotary Engine”, U.S. Pat. No. 4,064,841 (Dec. 27, 1977) describes a rotary engine having a stator, an offset, a track in the rotor, and roller vanes running in the track, where each vane extends outward to separate the rotor/stator gap into chambers.
R. Roberts, et. al., “Rotary Sliding Vane Compressor with Magnetic Vane Retractor”, U.S. Pat. No. 4,132,512 (Jan. 2, 1979) describes a rotary sliding vane compressor having magnetic vane retractor means to control the pumping capacity of the compressor without the use of an on/off clutch in the drive system.
D. August, “Rotary Energy-Transmitting Mechanism”, U.S. Pat. No. 4,191,032 (Mar. 4, 1980) describes a rotary energy-transmitting device configured with a stator, an inner rotor, and vanes separating the stator and rotor into chambers, where the vanes each pivot on a rolling ball mechanism, the ball mechanisms substantially embedded in the rotor.
J. Taylor, “Rotary Internal Combustion Engine”, U.S. Pat. No. 4,515,123 (May 7, 1985) describes a rotary internal combustion engine, which provides spring-loaded vanes seated opposed within a cylindrical cavity in which a rotary transfer valve rotates on a shaft.
S. Sumikawa, et. al. “Sliding-vane Rotary Compressor for Automotive Air Conditioner”, U.S. Pat. No. 4,580,950 (Apr. 8, 1986) describe a sliding-vane rotary compressor utilizing a control valve constructed to actuate in immediate response to a change in pressure of a fluid to be compressed able to reduce the flow of the fluid when the engine rate is high.
W. Crittenden, “Rotary Internal Combustion engine”, U.S. Pat. No. 4,638,776 (Jan. 27, 1987) describes a rotary internal combustion engine utilizing a radial sliding vane on an inner surface of an eccentric circular chamber, and an arcuate transfer passage communicating between the chambers via slots in the rotors adjacent the vanes.
R. Wilks, “Rotary Piston Engine”, U.S. Pat. No. 4,817,567 (Apr. 4, 1989) describes a rotary piston engine having a pear-shaped piston, with a piston vane, and four spring-loaded vanes mounted for reciprocal movement.
J. Bishop, et. al., “Rotary Vane Pump With Carbon/Carbon Vanes”, U.S. Pat. No. 5,181,844 (Jan. 26, 1993) describes a rotary sliding vane pump having vanes fabricated from a carbon/carbon based material that is optionally teflon coated.
K. Pie, “Rotary Device with Vanes Composed of Vane Segments”, U.S. Pat. No. 5,224,850 (Jul. 6, 1993) describes a rotary engine having multipart vanes between an inner rotor and an outer housing, where each vane has end parts and an intermediate part. In a first embodiment, the intermediate part and end part have cooperating inclined ramp faces, such that an outwardly directed force applied to the vane or by a biasing spring causes the end parts to thrust laterally via a wedging action. In a second embodiment, the end parts and intermediate part are separated by wedging members, located in the intermediate portion, acting on the end parts.
S. Anderson, “Gas Compressor/Expander”, U.S. Pat. No. 5,379,736 (Jan. 10, 1995) describes an air compressor and gas expander having an inner rotor, an outer stator, and a set of vanes, where each vanes independently rotates, along an axis parallel to an axis of rotation of the rotor, to separate a space between the rotor and stator into chambers.
B. Mallen, et. al., “Sliding Vane Engine”, U.S. Pat. No. 5,524,587 (Jun. 11, 1996) describes a sliding vane engine including: a stator and a rotor in relative rotation and vanes containing pins that extend into a pin channel for controlling sliding motion of the vanes.
J. Penn, “Radial Vane Rotary Engine”, U.S. Pat. No. 5,540,199 (Jul. 30, 1996) describes a radial vane rotary engine having an inner space with a substantially constant distance between an inner cam and an outer stator, where a set of fixed length vanes separate the inner space into chambers. The inner rotating cam forces movement of each vane to contact the outer stator during each engine cycle.
L. Hedelin, “Sliding Vane Machine Having Vane Guides and Inlet Opening Regulation”, U.S. Pat. No. 5,558,511 (Sep. 24, 1996) describes a sliding vane machine with a cylindrical rotor placed in a housing, the rotor being rotatably mounted in the housing at one point and being provided with a number of vanes, where movement of the vanes is guided along a guide race in the housing.
K. Kirtley, et. al., “Rotary Vane Pump With Continuous Carbon Fiber Reinforced PolyEtherEtherKetone (PEEK) Vanes”, U.S. Pat. No. 6,364,646 B1 (Apr. 2, 2002) describes a rotary paddle pump with sliding vanes and a stationary side wall, where the vanes and side wall are fabricated using a continuous carbon-fiber reinforced polyetheretherketone material, having self-lubrication properties.
R. Davidow, “Steam-Powered Rotary Engine”, U.S. Pat. No. 6,565,310 B1 (May 20, 2003) describes a steam-powered rotary engine having a rotor arm assembly and an outer ring, where steam ejected from an outer end of the rotor arm assembly impacts at essentially right angle onto steps in the outer ring causing the rotor arm to rotate in a direction opposite the direction of travel of the exiting steam.
D. Renegar, “Flexible Vane Rotary Engine”, U.S. Pat. No. 6,659,065 B1 (Dec. 9, 2003) describes an internal combustion rotary engine comprising a rotor spinning in an oval cavity and flexible vanes, defining four chambers, that bend in response to cyclical variation in distance between the rotor and an inner wall of a housing of the rotary engine.
R. Saint-Hilaire, et. al., “Quasiturbine (Qurbine) Rotor with Central Annular Support and Ventilation”, U.S. Pat. No. 6,899,075 B2 (May 31, 2005) describe a quasiturbine having a rotor arrangement peripherally supported by four rolling carriages, the carriages taking the pressure load of pivoting blades forming the rotor and transferring the load to the opposite internal contoured housing wall. The pivoting blades each include wheel bearing rolling on annular tracks attached to the central area of the lateral side covers forming part of the stator casing.
T. Hamada, et. al. “Sliding Structure for Automotive Engine”, U.S. Pat. No. 7,255,083 (Aug. 14, 2007) describe an automotive engine having a sliding portion, such as a rotary vane, where the sliding portion has a hard carbon film formed on the base of the sliding portion.
S. MacMurray, “Single Cycle Elliptical Rotary Engine”, U.S. Pat. No. 7,395,805 B1 (Jul. 8, 2008) describes a rotary engine configured a rotor housing having a bisected, offset elliptical interior wall a rotor member disposed therein. Four vanes rotate with the rotor. The rotor vanes are forced out by a pressurized oxygen/fuel mixture entering behind the vanes through ports and the vanes are pushed back into the rotor due to narrowing elliptical walls of the housing.
W. Peitzke, et. al., “Multilobe Rotary Motion Asymmetric Compression/Expansion Engine”, U.S. Pat. No. 7,578,278 B2 (Aug. 25, 2009) describe a rotary engine with multiple pivotally mounted lobes desmodromically extendible and retractable from a rotor to trace asymmetric volumes for inlet and compression and for inlet and exhaust based on the contour of the engine case, which the lobes sealingly engage.
J. Rodgers, “Rotary Engine”, U.S. Pat. No. 7,713,042, B1 (May 11, 2010) describes a rotary engine configured to use compressed air or high pressure steam to produce power. The engine includes a rotor having three slotted piston, opposed inlet ports running through a central valve into the slotted pistons, and a casing having two exhaust ports.
Valves
T. Larson, “Rotary Engine”, U.S. Pat. No. 4,548,171 (Oct. 22, 1985) describes a rotary engine having a plurality of passages for intake, compression, expansion, and exhaust and valve means to selectively open and close the passages in a cycle of the engine.
S. Nagata, et. al., “Four Cycle Rotary Engine”, U.S. Pat. No. 5,937,820 (Aug. 17, 1999) describes a rotary engine configured with an oblong casing, a circular shaped rotor therein, vanes attached to the rotor, and inlet and outlet valves. Means for manipulating the inlet and outlet valves are housed in the rotor.
Seals
L. Keller, “Rotary Vane Device with Improved Seals”, U.S. Pat. No. 3,883,277 (May 13, 1975) describes an eccentric rotor vane device having a plurality of annularly related radial vanes, independently pivotal and rotatable about a vane axis, where seal means include a plurality of cylindrical rollers that serve as vane guides intermediate each pair of vanes, the cylindrical rollers adjacent each face of each respective lateral vane face so that the vane traverses radially inward and outward with the vanes lateral faces rolling on the rollers.
J. Wyman, “Rotary Motor”, U.S. Pat. No. 4,115,045 (Sep. 19, 1978) describes a rotary steam engine having a peripheral, circular casing with side walls defining an interior cylindrical section and a rotor adapted to rotate therein, where the rotor includes a series of spaced transverse lobes with spring-biased transverse seals adapted to engage the inner periphery of the casing and the casing having a series of spaced spring-biased transverse vanes adapted to engage the outer periphery seals and lobes of the rotor.
R. Rettew, “Rotary Vane Machine with Roller Seals for the Vanes”, U.S. Pat. No. 4,168,941 (Sep. 25, 1979) describes a rotary vane machine using tapered vanes. Rollers, which form seals are disposed in slots formed in a rotor wall opening on each side of the tapered vanes. The roller seals are spring biased against the vanes and centrifugal forces urge rollers against the vanes to form the seals.
F. Lowther, “Rotary Sliding Vane Device with Radial Bias Control”, U.S. Pat. No. 4,355,965 (Oct. 26, 1982) describes a rotary sliding vane device having vanes having longitudinal passages and axial passages therethrough for supplying lubrication and sealing fluid to the tip and axial end portions of the vane.
H. Banasiuk, “Floating Seal System for Rotary Devices”, U.S. Pat. No. 4,399,863 (Aug. 23, 1983) describes a floating seal system for rotary devices to reduce gas leakage around the rotary device. The peripheral seal bodies have a generally U-shaped cross-section with one of the legs secured to a support member and the other forms a contacting seal against the rotary device. A resilient flexible tube is positioned within a tubular channel to reduce gas leakage across the tubular channel and a spacer extends beyond the face of the floating channel to provide a desired clearance between the floating channel and the face of the rotary device.
C. David, “External Combustion Rotary Engine”, U.S. Pat. No. 4,760,701 (Aug. 2, 1988) describes an external combustion rotary engine configured to operate using compressed air in internal expansion chambers. A fraction of the compressed air is further compressed and used as an air pad cushion to isolate rotating engine components from fixed position engine components.
E. Slaughter, “Hinged Valved Rotary Engine with Separate Compression and Expansion Chambers”, U.S. Pat. No. 4,860,704 (Aug. 29, 1989) describes a hinge valved rotary engine where air is compressed by cooperation of a hinged compression valve that sealingly engages a compression rotor of the engine. Further, vanes expansion rotor lobe seals are forced into contact with the peripheral surface of the expansion chamber using springs.
C. Parme, “Seal Rings for the Roller on a Rotary Compressor”, U.S. Pat. No. 5,116,208 (May 26, 1992) describes a sliding vane rotary pump, including: a housing, a roller mounted in the cylindrical housing, and bearing plates for closing top and bottom ends of the cylindrical opening. A seal ring is disposed within a counterbored surface of each end of the cylindrical ring, the internal space is filled with a pressurized fluid supplied by the compressor, and the pressurized fluid exerts a bias force on the seal rings causing the seal rings to move outwardly from the ends of the roller to form a seal with the bearing plates.
J. Kolhouse, “Self-Sealing Water Pump Seal”, U.S. Pat. No. 5,336,047 (Aug. 9, 1994) describes a self-sealing water pump seal having a barrier after a primary seal, the barrier designed to become clogged over time with solids leaking past the primary seal, thereby forming a secondary seal.
O. Lien, “Rotary Engine Piston and Seal Assembly”, U.S. Pat. No. 5,419,691 (May 30, 1995) describes a rotary engine piston and seal assembly having a cube shaped piston and a pair of grooves running around all four sliding side surfaces of the piston. the grooves contain a series of segmented metal seal compressed against mating surfaces with seal springs.
T. Stoll, et. al., “Hinged Vane Rotary Pump”, U.S. Pat. No. 5,571,005 (Nov. 5, 1996) describes a hinged vane rotary pump including: a cylindrical chamber, a rotor eccentrically mounted within the chamber, and a plurality hinged vanes, where wear on the vane effectively moves to the center of the vane.
D. Andres, “Air Bearing Rotary Engine”, U.S. Pat. No. 5,571,244 (Nov. 5, 1996) describes a rotary engine including vanes having tip apertures supplied with pressurized fluid to provide air bearings between the vane tip and a casing of the stator housing.
J. Klassen, “Rotary Positive Displacement Engine”, U.S. Pat. No. 6,036,463 (Mar. 14, 2000) describes an engine having a pair of rotors both housed within a single housing, where each rotor is mounted on an axis extending through a center of the housing, where the rotors interlock with each other to define chambers, where a contact face of a first rotor is defined by rotation of a conical section of a second rotor of the two rotors, such that there is a constant linear contact between opposing vanes on the two rotors.
J. Klassen, “Rotary Engine and Method for Determining Engagement Surface Contours Therefor”, U.S. Pat. No. 6,739,852 B1 (May 25, 2004) describes a rotary engine configured with rotor surfaces that are mirror images of engine interior contours to form a seal and recesses for interrupting the seal at predetermined points in a rotational cycle of the engine.
J. Rodgers, “Rotary Engine”, U.S. Pat. No. 7,713,042 B1 (May 11, 2010) describes a rotary engine configured with pistons, where springs within each piston cause an angled tip of the piston to contact a rotary chamber edge upon start up.
B. Garcia, “Rotary Internal Combustion Engine”, U.S. patent application Ser. No. 2006/0102139 A1 (May 18, 2006) describes a rotary internal combustion engine having a coaxial stator, a rotor, and a transmission system, where the transmission system causes retraction movements of a first group of blades to transmit to a second group of blades forming a seal between the free edge of the blades and the inner surface of the engine.
Exhaust
W. Doerner, et. al., “Rotary Rankine Engine Powered Electric Generating Apparatus”, U.S. Pat. No. 3,950,950 (Apr. 20, 1976) describe a rotary closed Rankine cycle turbine engine powered electric generating apparatus having a single condenser and/or a primary and secondary condenser for condensing exhaust vapors.
D. Aden, et. al., “Sliding Vane Pump”, U.S. Pat. No. 6,497,557 B2 (Dec. 24, 2002) describes a sliding vane pump having a plurality of inlet ports, internal discharge ports, and at least two discharge ports where all of the fluid from one of the internal discharge ports exits through one of the external discharge ports.
J. Klassen, “Method for Determining Engagement Surface Contours for a Rotor of an Engine”, U.S. Pat. No. 6,634,873 B2 (Oct. 21, 2003) describes a rotary engine configured with rotor surfaces that are mirror images of engine interior contours to form a seal and recesses for interrupting the seal at predetermined points in a rotational cycle of the engine.
D. Patterson, et. al., “Combustion and Exhaust Heads for Fluid Turbine Engines”, U.S. Pat. No. 6,799,549 B1 (Oct. 5, 2004) describes an internal combustion rotary turbine engine including controls for opening and closing an exhaust valve during engine operation.
R. Gorski, “Gorski Rotary Engine”, U.S. Pat. No. 7,073,477 B2 (Jul. 11, 2006) describes a rotary engine configured with solid vanes extending from a rotor to an interior wall of the stator housing. A series of grooves in the interior wall permit the expanding exhaust gases to by-pass the vanes proximate the combustion chamber to engage the larger surface area of the vane protruding from the rotor.
H. Maeng, “Sliding Vane of Rotors”, U.S. Pat. No. 7,674,101 B2 (Mar. 9, 2010) describes a sliding vane extending through a rotor in diametrically opposed directions and rotating with the rotor. Diametrically opposed ends of the sliding vane include sealing slots. The sliding vane further includes two pairs of compression plates provided in plate sealing slots for sealing the edges of the vane, the compression plates activated using springs in the vane.
E. Carnahan, “External Heat Engine of the Rotary Vane Type and Compressor/Expander”, U.S. patent application Ser. No. US 2008/0041056 A1 (Feb. 21, 2008) describes a rotary engine using injected cool liquid into a compression section of the engine.
Cooling
G. Cann, “Rankine Cycle Engine”, U.S. Pat. No. 4,367,629 (Jan. 11, 1983) describes a Rankine cycle engine having a coolant disposed within rotor coolant passages that uses centrifugal force to accelerate movement of the coolant.
T. Maruyama, et. al. “Rotary Vane Compressor With Suction Port Adjustment”, U.S. Pat. No. 4,486,158 (Dec. 4, 1984) describe a sliding vane type rotary compressor with suction port adjustment, of which refrigerating capacity at the high speed operation is suppressed by making use of suction loss involved when refrigerant pressure in the vane chamber becomes lower than the pressure of the refrigerant supply source in the suction stroke of the compressor.
A. Ryska, et. al., “Two-Stage Rotary Vane Motor”, U.S. Pat. No. 6,086,347 (Jul. 11, 2000) describes a two-stage rotary vane motor having first and second fluid cooling chambers with independent inlets for receiving pressurized cryogen. One chamber is used for low cooling requirements and both chambers are used for high cooling requirements.
R. Ullyott, “Internal Cooling System for Rotary Engine”, U.S. Pat. No. 7,412,831 B2 (Aug. 19, 2008) describes a rotary combustion engine with self-cooling system, where the cooling system includes: a heat exchanging interface and a drive fan integrated on an output shaft of the rotary engine, the fan providing a flow of forced air over the heat exchanging interface.
Varying Loads
T. Alund, “Sliding Vane Machines”, U.S. Pat. No. 4,046,493 (Sep. 6, 1977) describes a sliding vane machine using a valve and pressure plates to control the working area of valves in the sliding vane machine.
Jet
A. Schlote, “Rotary Heat Engine”, U.S. Pat. No. 5,408,824 (Apr. 25, 1995) describes a jet-propelled rotary engine having a rotor rotating about an axis and at least one jet assembly secured to the rotor and adapted for combustion of a pressurized oxygen-fuel mixture.
Problem Statement
What is needed is an engine, pump, expander, and/or compressor that more efficiently converts fuel or energy into motion, work, power, stored energy, and/or force. For example, what is needed is an external combustion rotary heat engine that more efficiently converts about adiabatic expansive energy of the gases driving the engine into rotational power and/or energy for use in a variety of applications.
SUMMARY OF THE INVENTION
The invention comprises a rotary engine method and apparatus using a deformable lip seal to seal rotary engine chambers.



BRIEF DESCRIPTION OF THE DRAWINGS
A more complete understanding of the present invention is derived by referring to the detailed description and claims when considered in connection with the Figures, wherein like reference numbers refer to similar items throughout the Figures.
FIG. 1 illustrates a rotary engine system;
FIG. 2 illustrates a rotary engine housing;
FIG. 3 illustrates a sectional view of a single offset rotary engine;
FIG. 4 illustrates a sectional view of a double offset rotary engine;
FIG. 5 illustrates housing cut-outs;
FIG. 6 illustrates a housing build-up;
FIG. 7 provides a method of use of the rotary engine system;
FIG. 8 illustrates an expanding expansion chamber with rotor rotation;
FIG. 9 illustrates an expanding concave expansion chamber with rotor rotation;
FIG. 10 illustrates a vane;
FIG. 11 illustrates a rotor having valving;
FIG. 12 illustrates a rotor and vanes having fuel paths;
FIG. 13 illustrates a booster;
FIG. 14 illustrates a vane having multiple fuel paths;
FIG. 15 illustrates a fuel path running through FIG. 15A a shaft and FIG. 15B into a vane.
FIG. 16 illustrates a vane in a cross sectional view, FIG. 16A, and in a perspective view, FIG. 16B.
FIG. 17 illustrates a vane end;
FIG. 18 illustrates a vane extension or wing;
FIG. 19 illustrates a pressure relief cut in a vane extension or wing;
FIG. 20 illustrates a vane wing booster;
FIG. 21 illustrates a swing vane, FIG. 21A, and a set of swing vanes in a rotary engine, FIG. 21B;
FIG. 22 illustrates a vane having a cap;
FIG. 23 illustrates a dynamic vane cap in a high potential energy state for vane cap actuation, FIG. 23A, and in a relaxed vane cap actuated state, FIG. 23B;
FIG. 24 illustrates a cap bearing relative to a vane cap in an unaccuated, FIG. 24A, and actuated state, FIG. 24B state;
FIG. 25 illustrates multiple axes vane caps;
FIG. 26 illustrates rotor caps;
FIG. 27 is a perspective view of a vane having lip seals;
FIG. 28 is a perspective view of a cap having a lip seal;
FIG. 29 is a perspective view of lip seals in a natural state, FIG. 29A, and in a deformed state, FIG. 29B; and
FIG. 30 is an illustrative cross-sectional view of a rotor having lip seals.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention comprises a rotary engine method and apparatus configured with at least one lip seal. A lip seal restricts fuel flow from a fuel compartment to a non-fuel compartment and/or fuel flow between fuel compartments, such as between a reference expansion chamber and any of an engine: rotor, vane, housing, and/or a leading or trailing expansion chamber. Types of lip seals include: vane lip seals, rotor lip seals, and rotor-vane slot lip seal. Generally, lip seals dynamically move or deform as a result of fuel movement or pressure to seal a junction between a sealing surface of the lip seal and a rotary engine component. For example, a vane lip seal sealing to the inner housing dynamically moves along the y-axis until an outer surface of the lip seal seals to the housing.
In another embodiment, the rotary engine method and apparatus uses an offset rotor. The rotary engine is preferably a component of an engine system using a recirculating liquid/vapor.
In yet another embodiment, an engine is described for operation on a fuel expanding about adiabatically in a power stroke of the engine. To aid the power stroke efficiency, the rotary engine contains one or more of a rotor configured to rotate in a stator, the rotor offset along both an x-axis and a y-axis relative to a center of the stator, a vane configured to span a distance between the rotor and the stator, where the inner wall of the stator further comprises at least one of: a first cut-out in the housing at the initiation of the power stroke, use of a build-up in the housing at the end of the power stroke, and/or use of a second cut-out in the housing at the completion of rotation of the rotor in the engine. The engine yields a cross-sectional area expanding during a portion of the power stroke at about the Fibonacci ratio.
For example, a rotary engine is provided for operation on a recirculating fuel expanding about adiabatically during a power cycle or power stroke of the rotary engine. To aid the power stroke efficiency, the rotary engine preferably contains one or more of:

    
    
        a double offset rotor geometry relative to a housing or a stator, such as an eccentrically positioned rotor relative to the housing, where the eccentrically positioned rotor is additionally offset so that the rotor is offset from the housing center along both an x-axis and a y-axis;
        use of a first cut-out in the engine housing at the initiation of the power stroke;
        use of a build-up in the housing at the end of the power stroke; and/or
        use of a second cut-out in the housing at the completion of rotation of the rotor in the engine.
    
    


The first-cut out allows an increased distance between a stator or the housing and the rotor, which yields an increased cross-sectional area of the expansion chamber, which yields increased power of the engine. The build-up allows an increased x-axis and y-axis offset of the double offset rotor relative to the center of the housing. More particularly, the vane reaches full extension before the six o'clock position to optimize power and without the build up at the six o'clock position the vane overextends potentially causing unit failure. The second cut-out allows room for a vane, having a vane tip, a vane wing, a vane wingtip, or a vane end not fully retractable into the rotor, to pass between the rotor and the stator at about the eleven o'clock position without restraint of movement.
In yet still another embodiment, a rotary engine is described including: (1) a rotor eccentrically located within a housing, the rotor configured with a plurality of rotor vane slots; (2) a first vane of a set of vanes separating an interior space between the rotor and the housing into at least a trailing chamber and a leading chamber, where the first vane slidingly engages a rotor vane slot; (3) a first conduit within the rotor configured to communicate a first flow between the trailing chamber and the rotor vane slot; and (4) a second conduit within the rotor configured to communicate a second flow between the trailing chamber and the first conduit. Optionally, a vane seal is affixed to the first vane or the rotor, where the vane seal is configured to valve the first conduit or a vane conduit, respectively.
In still yet another embodiment, a rotary engine is described having fuel paths that run through a portion of a rotor of the rotary engine, through a portion of a shaft, and/or through a vane of the rotary engine. The fuel paths are optionally opened and shut as a function of rotation of the rotor to enhance power provided by the engine. The valving that opens and/or shuts a fuel path operates to: (1) equalize pressure between an expansion chamber and a rotor-vane chamber and/or (2) to control a booster, which creates a pressure differential resulting in enhanced flow of fuel. The fuel paths, valves, seals, and boosters are further described, infra.
In yet another embodiment, a rotary engine or an external combustion rotary engine is described including: (1) a rotor located within a housing, the rotor configured with a plurality of rotor vane slots; (2) a vane separating an interior space between the rotor and the housing into at least a trailing chamber and a leading chamber, where the vane slidingly engages a rotor vane slot; (3) a first conduit within the rotor configured to communicate a first flow between the trailing chamber and the rotor vane slot; and (4) a lower trailing vane seal affixed to the vane, the lower trailing vane seal configured to valve the first conduit with rotation of the rotor. Optionally, a second conduit within the rotor is configured to communicate a second flow between the trailing chamber and the first conduit. Optionally, movement of the vane operates to directly valve one or more additional fuel flow paths as a function of rotation of the rotor.
In still another embodiment, a rotary engine is described including: (1) a rotor located within a housing, the rotor configured with a plurality of rotor vane slots; (2) a vane separating an interior space between the rotor and the housing into at least a trailing chamber and a leading chamber, where the vane slidingly engages a rotor vane slot; (3) a first passage through the vane, the first passage including a first exit port into the rotationally trailing chamber; and (4) a second exit port to the rotationally trailing chamber, where the first exit port and the second exit port connect to any of: (a) the first passage through the vane and (b) the first passage and a second passage through the vane, respectively. Optionally, one or more seals affixed to the vane and/or the rotor, valve the first passage, the second passage, a vane wingtip, and/or a conduit through the rotor.
In yet another embodiment, a vane or a vane component reduces chatter or vibration of a vane end against the inner wall of the housing of the rotary engine during operation of the engine, where chatter leads to unwanted opening and/or closing of the seal between an expansion chamber and a leading chamber. For example, the bearings bear the force of the vane against the inner wall of the rotary engine housing relieving centrifugal force, which facilitates the seals sealing the vane to the housing and additionally to provides a seal between the leading chamber and the expansion chamber of the rotary engine. Pressure build-up between the vane end and the inner wall of the housing, which results in unwanted engine chatter or chatter about the vane end proximate the housing, is reduced through the use of one or more pressure relief cuts, and optionally with a vane path booster element. The reduction of engine chatter increases engine power and/or efficiency. Further, the pressure relief aids in uninterrupted contact of the seals between the vane and inner housing of the rotary engine, which yields enhanced rotary engine efficiency.
In still another embodiment, a vane is carried with a rotor. The vane optionally includes: (1) a central vane axis extending radially outward along a y-axis, the y-axis comprising a line from a center of the rotor to a housing; and (2) a vane end intersecting the y-axis proximate an inner surface of the housing. Rotation of the rotor within the housing generates a centrifugal force of the vane toward the housing. The centrifugal force is primarily distributed and/or opposed with a first sealing element mounted on an end of the vane, such as a rigid support, ball bearing, and/or a roller bearing. The rigid structure of the first sealing element allows use of a second flexible sealing element mounted on the vane end. The second flexible sealing element performs as a seal between a trailing expansion chamber and a leading expansion chamber on opposite sides of the vane. The rigid seal and the flexible seal typically function independently of each other as separate constituents of the tip or end of a given vane. As the rigid sealing element resists the centrifugal force, the second sealing element is preferably designed to resist less than about ten percent of the outward centrifugal force of a given vane into the housing with rotation of the rotor in the housing.
In another embodiment, a rotary engine method and apparatus using a vane rotating with a rotor about a shaft in a rotary engine is described, where the vane has a vane end or vane tip including:

    
    
        one or more bearings for bearing the force of the vane applied to the inner housing;
        one or more seals for providing a seal between the leading chamber and expansion chamber;
        one or more pressure relief apertures or cuts for reducing pressure build-up between the vane extensions of vane wings and the inner wall of the housing; and/or
        a booster enhancing pressure equalization and/or flow from above to below a vane wing.
    
    


Further, fuels described maintain about adiabatic expansion to a high ratio of gas/liquid when maintained at a relatively constant temperature via use of a temperature controller for the expansion chambers. Expansive forces of the fuel acting on the rotor are aided by hydraulic forces, vortical forces, an about Fibonacci-ratio increase in volume in an expansion chamber during the power cycle or power stroke, sliding vanes, and/or swinging vanes between the rotor and housing. Herein, a power stroke refers to the stroke of a cyclic motor or engine which generates force.
In another embodiment, the invention comprises a rotary apparatus, such as an engine, method, and/or apparatus using a vane with at least one vane extension or vane wing rotating with a rotor about a shaft in a rotary engine. The vane extension or vane wing optionally includes: a curved outer surface, a curved inner surface, an aperture through the extension, and/or a curved tunnel passing through the wing. For example, the curved outer surface of the wing curves away from an inner wall of the engine housing as a function of distance away from the vane body. In a second example, the curved inner surface of the wing curves toward the inner wall of the engine housing as a function of distance from the vane body. In a third example fuel flows through the curved tunnel, aperture, or passageway thereby passing through the wing, which creates a partial negative pressure during engine operation that lifts an end or tip of the vane toward the housing while simultaneously reducing pressure between the vane end and the housing. The curved tunnel or passageway relieves pressure above the vane extension or vane wing thereby reducing possible chatter at the engine vane end/engine housing interface.
In another embodiment, a rotary engine is configured with elements having cap seals. A cap seal restricts fuel flow from a fuel compartment to a non-fuel compartment and/or fuel flow between fuel compartments, such as between a reference expansion chamber and any of an engine: rotor, vane, housing, and/or a leading or trailing expansion chamber. Types of caps include vane caps, rotor caps, and rotor-vane slot caps. For a given type of cap, optional sub-cap types exist. For example, types of vane caps include: vane-housing caps, vane-rotor-rotor caps, and vane-endplate caps. Generally, caps dynamically move or float to seal a junction between a sealing surface of the cap and a rotary engine component. For example, a vane cap sealing to the inner housing dynamically moves along the y-axis until an outer surface of the cap seals to the housing.
Means for providing cap sealing force to seal the cap against a rotary engine housing element comprise one or more of: a spring force, a magnetic force, a deformable seal force, and a fuel force. The dynamic caps ability to trace a noncircular path are particularly beneficial for use in a rotary engine having an offset rotor and with a non-circular inner rotary engine compartment having engine wall cut-outs and/or build-ups. Further, the dynamic sealing forces provide cap sealing forces over a range of temperatures and operating rotational engine speeds.
In still yet another embodiment, a rotary engine method and apparatus uses a swing vane and/or a telescoping swing vane. Preferably, three or more swing vanes are used in the rotary engine to separate expansion chambers of the rotary engine. A swing vane pivots about a pivot point on the rotor and/or about a separate pivot on the housing. Since, the swing vane pivots with rotation of the rotor in the rotary engine, the reach of the swing vane between the rotor and housing ranges from a narrow thickness or width of the swing vane to the longer length of the swing vane. The dynamic pivoting of the swing vane yields an expansion chamber separator ranging from the short width of the vane to the longer length of the vane, which allows use of an offset rotor in the rotary engine. Optionally, the swing vane additionally dynamically extends to reach the inner housing of the rotary engine. For example, an outer sliding swing vane portion of the swing vane slides along the inner pivoting portion of the swing vane to dynamically lengthen or shorten the length of the swing vane. The combination of the pivoting and the sliding of the vane allows for use with a double offset rotary engine having housing wall cut-outs and/or buildups, which allows greater volume of the expansion chamber during the power stroke of the rotary engine and corresponding increases in power and/or efficiency.
In another embodiment, the vanes reduce chatter or vibration of the vane-tips against the inner wall of the housing of the rotary engine during operation of the engine, where chatter leads to unwanted opening and closing of the seal between an expansion chamber and a leading chamber. For example, an actuator force forces the vane against the inner wall of the rotary engine housing thereby providing a seal between the leading chamber and expansion chamber of the rotary engine. The reduction of engine chatter increases engine power and/or efficiency. Further, pressure relief aids in uninterrupted contact of the seals between the vane and inner housing of the rotary engine, which yields enhanced rotary engine efficiency.
In yet still another embodiment, permutations and/or combinations of any of the rotary engine elements described herein are used to increase rotary engine efficiency.
Rotary Engine
Herein, rotary engine examples are used to explain the engine system 100 elements. However, the engine system 100 elements additionally apply in-part and/or in-whole to expander engines, heat engines, pumps, and/or compressors.
A rotary engine system uses power from an expansive force, such as from an internal or external combustion process, to produce an output energy, such as a rotational or electric force.
Referring now to FIG. 1, a rotary engine 110 is preferably a component of an engine system 100. In the engine system 100, gas/liquid in various states or phases are optionally re-circulated in a circulation system 180, illustrated figuratively. In the illustrated example, gas output from the rotary engine 110 is transferred to and/or through a condenser 120 to form a liquid; then through an optional reservoir 130 to a fluid heater 140 where the liquid is heated to a temperature and pressure sufficient to result in state change of the liquid to gas form when passed through an injector 160 and back into the rotary engine 110. In one case, the fluid heater 140 optionally uses an external energy source 150, such as radiation, vibration, and/or heat to heat the circulating fluid in an energy exchanger 142. In a second case, the fluid heater 140 optionally uses fuel in an external combustion chamber 154 to heat the circulating fluid in the energy exchanger 142. The rotary engine 110, is further described infra.
Still referring to FIG. 1, maintenance of the rotary engine 110 at a set operating temperature enhances precision and/or efficiency of operation of the engine system 100. Hence, the rotary engine 110 is optionally coupled to a temperature controller 170 and/or a block heater 175. Preferably, the temperature controller senses with one or more sensors the temperature of the rotary engine 110 and controls a heat exchange element attached and/or indirectly attached to the rotary engine, which maintains the rotary engine 110 at about the set point operational temperature. In a first scenario, the block heater 175 heats expansion chambers, described infra, to a desired operating temperature. The block heater 175 is optionally configured to extract excess heat from the fluid heater 140 to heat one or more elements of the rotary engine 110, such as the rotor 320, double offset rotor 440, vanes, an inner wall of the housing, an inner wall of the first end plate 212, and/or an inner wall of the first or second end plate 214.
Referring now to FIG. 2, the rotary engine 110 includes a stator or housing 210 on an outer side of a series of expansion chambers. The housing 210 optionally includes a first end plate 212 affixed to a first side of the housing and a second end plate 214 affixed to a second side of the housing. Combined, the housing 210, first end plate 212, second end plate 214, and a rotor, described infra, contain a series of expansion chambers in the rotary engine 110. An offset shaft preferably runs into and/or runs through the first end plate 212, inside the housing 210, and into and/or through the second end plate 214. The offset shaft 220 is centered to the rotor 320 or double offset rotor 440 and is offset relative to the center of the rotary engine 110.
Rotors
Rotors of various configurations are used in the rotary engine 110. The rotor 320 is optionally offset in the x- and/or y-axes relative to a z-axis running along the length of the shaft 220. A rotor 320 offset in the x-axis and y-axis relative to a z-axis running along the length of the shaft 220 is referred to herein as a double offset rotor 440. The shaft 220 is optionally double walled or multi-walled. The rotor chamber face 442, also referred to as an outer edge of the rotor, or the rotor outer wall, of the double offset rotor 440 forming an inner wall of the expansion chambers is of any geometry. Examples of rotor configurations in terms of offsets and shapes are further described, infra. The examples are illustrative in nature and each element is optional and is optionally used in various permutations and/or combinations with other elements described herein.
Vanes
A vane or blade separates two chambers of a rotary engine. The vane optionally functions as a seal and/or valve. The vane itself optionally acts as a propeller, impeller, and/or an electromagnetic generator element.
Engines are illustratively represented herein with clock positions, with twelve o'clock being a top of an x-, y-plane cross-sectional view of the engine with the z-axis running along the length of the shaft of the engine. The twelve o'clock position is alternatively referred to as a zero degree position. Similarly twelve o'clock to three o'clock is alternatively referred to as zero degrees to ninety degrees and a full rotation around the clock covers three hundred sixty degrees. Those skilled in the art will immediately understand that any multi-axes illustration system is alternatively used and that rotating engine elements in this coordination system alters only the relative description of the elements without altering the elements themselves or function of the elements.
Referring now to FIG. 3, vanes relative to an inner wall 420 of the housing 210 and relative to a rotor 320 are described. As illustrated, a z-axis runs through the length of the shaft 220 and the rotor rotates around the z-axis. A plane defined by x- and y-axes is perpendicular to the z-axis. Vanes extend between the rotor 320 and the inner wall 420 of the housing 210. As illustrated, the single offset rotor system 300 includes six vanes, with: a first vane 330 at a twelve o'clock position, a second vane 340 at a two o'clock position, a third vane 350 at a four o'clock position, a fourth vane 360 at a six o'clock position, a fifth vane 370 at a ten o'clock position, and a sixth vane 380 at a ten o'clock position. Any number of vanes are optionally used, such as about two, three, four, five, six, eight, or more vanes. Preferably, an even number of vanes are used in the rotor system 300.
Still referring to FIG. 3, the vanes extend outward from vane slots of the rotor 320. As illustrated, the first vane 330 extends from a first vane slot 332, the second vane 340 extends from a second vane slot 342, the third vane 350 extends from a third vane slot 352, the fourth vane 360 extends from a fourth vane slot 362, the fifth vane 370 extends from a fifth vane slot 372, and the sixth vane 380 extends from a sixth vane slot 382. Each of the vanes are slidingly coupled and/or hingedly coupled to the rotor 320 and the rotor 320 is fixedly coupled to the shaft 220. When the rotary engine is in operation, the rotor 320, vanes, and vane slots rotate about the shaft 220. Hence, the first vane 330 rotates from the twelve o'clock position sequentially through each of the two, four, six, eight, and ten o'clock positions and ends up back at the twelve o'clock position. When the rotary engine 210 is in operation, pressure upon the vanes causes the rotor 320 to rotate relative to a non-rotating or rotating inner wall of the housing 420, which causes rotation of shaft 220. As the rotor 210 rotates, each vane slides outward to maintain proximate contact or sealing contact with the inner wall of the housing 420.
Still referring to FIG. 3, expansion chambers or sealed expansion chambers relative to an inner wall 420 of the housing 210, vanes, and rotor 320 are described. As illustrated, the rotary system is configured with six expansion chambers. Each of the expansion chambers reside in the rotary engine 210 along the z-axis between the first end plate 212 and second end plate 214. Further, each of the expansion chambers resides between the rotor 320 and inner wall of the housing 420. Still further, the expansion chambers are contained between the vanes. As illustrated, a first expansion chamber 335 is in a first volume between the first vane 330 and the second vane 340, a second expansion chamber 345 is in a second volume between the second vane 340 and the third vane 350, a third expansion chamber 355 is in a third volume between the third vane 350 and the fourth vane 360, a fourth expansion chamber or first reduction chamber 365 is in a fourth volume between the fourth vane 360 and the fifth vane 370, a fifth expansion chamber or second reduction chamber 375 is in a fifth volume between the fifth vane 370 and the sixth vane 380, and a sixth expansion chamber or third reduction chamber 385 is in a sixth volume between the sixth vane 380 and the first vane 330. The first, second, and third reduction chambers 365, 375, 385 are optionally compression or exhaust chambers. As illustrated, the volume of the second expansion chamber 345 is greater than the volume of the first expansion chamber and the volume of the third expansion chamber is greater than the volume of the second expansion chamber. The increasing volume of the expansion chambers, during the power stroke, in the first half of a rotation of the rotor 320 about the shaft 220 results in greater efficiency, power, and/or torque, as described infra.
Single Offset Rotor
Still referring to FIG. 3, a single offset rotor is illustrated. The housing 210 has a center position in terms of the x-, y-, and z-axis system. In a single offset rotor system, the shaft 220 running along the z-axis is offset along one of the x- or y-axes. For clarity of presentation, expansion chambers are referred to herein as residing in static positions and having static volumes, though they rotate about the shaft and change in both volume and position with rotation of the rotor 320 about the shaft 220. As illustrated, the shaft 220 is offset along the y-axis, though the offset could be along the x-axis. Without the offset along the y-axis, each of the expansion chambers is uniform in volume. With the offset, the second expansion chamber 345, at the position illustrated, has a volume greater than the first expansion chamber and the third expansion chamber has a volume greater than that of the second expansion chamber. The fuel mixture from the fluid heater 140 or vapor generator is injected via one or more injectors 160 into the first expansion chamber 335 and/or into the shaft 220. As the rotor rotates, the volume of the expansion chambers increases, as illustrated in the static position of the second expansion chamber 345 and third expansion chamber 355. The increasing volume allows an expansion of the fuel, such as a gas, vapor, and/or plasma, which preferably occurs about adiabatically and/or in an about isothermal environment. The expansion of the fuel releases energy that is forced against the vane and/or vanes, which results in rotation of the rotor. The increasing volume of a given expansion chamber through the first half of a rotation of the rotor 320, such as in the power stroke described infra, about the shaft 220 combined with the extension of the vane from the rotor shaft to the inner wall of the housing results in a greater surface area for the expanding gas to exert force against resulting in rotation of the rotor 320. The increasing exposed surface area of the vane, reactive to the expanding gas, as a function of rotation in the first half of the rotation increases efficiency of the rotary engine 110. For reference, relative to double offset rotary engines and rotary engines including build-ups and cutouts, described infra, the single offset rotary engine has a first distance, d1, at the two o'clock position and a fourth distance, d4, between the rotor 320 and inner wall of the housing 430 at the eight o'clock position.
Double Offset Rotor
Referring now to FIG. 4, a double offset rotary engine 400 is illustrated. To demonstrate the offset of the housing, three housing 210 positions are illustrated. The double offset rotor 440 and vanes 450 are illustrated only for the double offset housing position 430. In the first zero offset position, the first housing position 410 is denoted by a dotted line and the housing 210 is equidistant from the double offset rotor 440 in the x-, y-plane. Stated again, in the first housing position, the double offset rotor 440 is centered relative to the first housing position 410 about point ‘A’. The centered first housing position 410 is non-functional. The single offset rotor position was described, supra, and illustrated in FIG. 3. The single offset housing position 420 is repeated and still illustrated as a dashed line in FIG. 4. The housing second position is a single offset housing position 420 centered at point ‘B’, which has an offset in only the y-axis versus the zero offset housing position 410. A third preferred housing position is a double offset rotor position 430 centered at position ‘C’. The double offset housing position 430 is offset in both the x- and y-axes versus the zero offset housing position. The offset of the housing 430 relative to the double offset rotor 440 in two axes results in efficiency gains of the double offset rotary engine, as described supra.
Still referring to FIG. 4, the extended two o'clock vane position 340 for the single offset rotor illustrated in FIG. 3 is re-illustrated in the same position in FIG. 4 as a dashed line with distance, d1, between the vane wing and the outer edge of the double offset rotor 440. It is observed that the extended two o'clock vane position 450 for the double offset rotor has a longer distance, d2, between the vane wing and the outer edge of the double offset rotor 440 compared with the extended position vane in the single offset rotor. The larger extension, d2, yields a larger cross-sectional area for the expansive forces in the first expansion chamber 335 to act on, thereby resulting in larger forces, such as turning forces or rotational forces, from the expanding gas pushing on the double offset rotor 440. Note that the illustrated double offset rotor 440 in FIG. 4 is illustrated with the rotor chamber face 442 having a curved surface running from near a wing tip of a vane toward the shaft in the expansion chamber to increase expansion chamber volume and to allow a greater surface area for the expanding gases to operate on with a force vector, F. The curved surface is of any specified geometry to set the volume of the expansion chamber 335. Similar force and/or power gains are observed from the twelve o'clock to six o'clock position using the double offset rotary engine 400 compared to the single offset rotary engine 300.
Still referring to FIG. 4, The fully extended eight o'clock vane 370 of the single offset rotor is re-illustrated in the same position in FIG. 4 as a dashed image with distance, d4, between the vane wing and the outer edge of the double offset rotor 440. It is noted that the double offset housing 430 forces full extension of the vane to a smaller distance, d5, between the vane wing tip and the outer edge of the double offset rotor 440. However, rotational forces are not lost with the decrease in vane extension at the eight o'clock position as the expansive forces of the gas fuel are expended by the six o'clock position and the gases are vented before the eight o'clock position, as described supra. The detailed eight o'clock position is exemplary of the six o'clock to twelve o'clock positions.
The net effect of using a double offset rotary engine 400 is increased efficiency and power in the power stroke, such as from about the twelve o'clock position to about the six o'clock position or through about 180 degrees, using the double offset rotary engine 400 compared to the single offset rotary engine 300. The double offset rotary engine design 400 reduces loss of efficiency, parasitic negative work, or power from the six o'clock to twelve o'clock positions relative to the single offset rotary engine 300.
Cutouts, Build-ups, and Vane Extension
FIGS. 3 and 4 illustrate inner walls of housings 410, 420, and 430 that are circular. However, an added power and/or efficiency advantage results from cutouts and/or buildups in the inner surface of the housing. For example, an x-, y-axes cross-section of the inner wall shape of the housing 210 is optionally non-circular, elliptical, oval, egg shaped, cutout relative to a circle, and/or built up relative to a circle.
Referring now to FIG. 5 and still referring to FIG. 4, optional cutouts in the housing 210 are described. A cutout is readily understood as a removal of material from a elliptical inner wall of the housing; however, the material is not necessarily removed by machining the inner wall, but rather is optionally cast or formed in final form or is defined by the shape of an insert piece or insert sleeve that fits along the inner wall 420 of the housing. For clarity, cutouts are described relative to the inner wall of the double offset rotor housing 430; however, cutouts are optionally used with any housing 210. The optional cutouts and build-ups described herein are optionally used independently or in combination.
Still referring to FIG. 5, a first optional cutout is illustrated at about the one o'clock to three o'clock position of the housing 430. To further clarify, a cut-out, which is optionally referred to as a vane extension limiter beyond a nominal distance to the housing 430, is optionally: (1) a machined away portion of an otherwise inner wall of the circular housing 430; (2) an inner wall housing 430 section having a greater radius from the center of the shaft 220 to the inner wall of the housing 430 compared with a non-cutout section of the inner wall housing 430; (3) is a section molded, cast, and/or machined to have a further distance for the vane 450 to slide to reach the housing compared to a nominal circular housing; or (4) is a removable housing insert circumferentially bordering the inner wall housing 430 about the rotor, where the housing insert includes an increased distance from the center of the rotor within the cut-out at the one o'clock to three o'clock position. For clarity, only the ten o'clock to two o'clock position of the double offset rotary engine 400 is illustrated. The first cutout 510 in the housing 430 is present in about the twelve o'clock to three o'clock position and preferably at about the two o'clock position. Generally, the first cutout allows a longer vane 450 extension at the cutout position compared to a circular or an elliptical x-, y-cross-section of the housing 430. To illustrate, still referring to FIG. 5, the extended two o'clock vane position 340 for the double offset rotor illustrated in FIG. 4 is re-illustrated in the same position in FIG. 5 as a solid line image with distance, d2, between the vane wing tip and the outer edge of the double offset rotor 440. It is observed that the extended two o'clock vane position 450 for the double offset rotor having cutout 510 has a longer distance, d3, between the vane wing tip and the outer edge of the double offset rotor 440 compared with the extended position vane in the double offset rotor. The larger extension, d3, yields a larger cross-sectional area for the expansive forces, pump forces, compression forces, and/or hydraulic forces in the first expansion chamber 335 to act on, thereby resulting in larger turning forces from the expanding gas pushing on the double offset rotor 440. To summarize, the vane extension distance, d1, using a single offset rotary engine 300 is less than the vane extension distance, d2, using a double offset rotary engine 400, which is less than vane extension distance, d3, using a double offset rotary engine with a first cutout as is observed in equation 1.

d1<d2<d3  (eq. 1)

Still referring to FIG. 5, a second optional cutout 520 is illustrated at about the eleven o'clock position of the housing 430. The second cutout 520 is present at about the ten o'clock to twelve o'clock position and preferably at about the eleven o'clock to twelve o'clock position. Generally, the second cutout allows a vane having a wingtip protrusion, or radial extension, described supra, to physically fit between the double offset rotor 440 and housing 430 in a double offset rotary engine 500. The second cutout 520 also adds to the magnitude of the offset possible in the single offset engine 300 and in the double offset engine 400, which increases distances d2 and d3.
Referring now to FIG. 6, an optional build-up 610 on the interior wall of the housing 430 is illustrated from an about five o'clock to an about seven o'clock position of the engine rotation. The build-up 610 allows a greater offset of the double offset rotor 440 up along the y-axis. Without the build-up 610, a smaller y-axis offset of the double offset rotor 440 relative to the housing 430 is needed as the vane 450 at the six o'clock position would not reach, without possible damage due to overextension of the vane, the inner wall of the housing 430. As illustrated, the build-up 610 reduces the vane extension distance required for the vane 450 to reach from the double offset rotor 440 to the housing 430 from a sixth distance, d6, from an elliptical housing to a seventh distance, d7 of the built-up housing 610. As described, supra, the greater offset in the x- and y-axes of the double offset rotor 440 relative to the housing 430 yields greater rotary engine 110 output power and/or efficiency by increasing the volume of the first expansion chamber 335, second expansion chamber 345, and/or third expansion chamber 355.
Method of Operation
For the purposes of this discussion, any of the single offset-rotary engine 300, double offset rotary engine 400, rotary engine having a cutout 500, rotary engine having a build-up 600, or a rotary engine having one or more elements described herein is applicable to use as the rotary engine 110 used in this example. Further, any housing 210, rotor 320, and vane 450 dividing the rotary engine 210 into expansion chambers is optionally used as in this example. For clarity, a reference expansion chamber is used to describe a current position of the expansion chambers. For example, the reference chamber rotates in a single rotation from the twelve o'clock position and sequentially through the one o'clock position, three o'clock position, five o'clock position, seven o'clock position, nine o'clock position, and eleven o'clock position before returning to the twelve o'clock position. The reference expansion chamber is alternatively referred to as a compression chamber from about a six o'clock to the twelve o'clock position. Alternately, the reference expansion chamber functions as a compression chamber or pump chamber.
Referring now to FIG. 7, a flow chart of a process 700 for the operation of rotary engine system 100 in accordance a preferred embodiment is described. Process 700 describes the operation of rotary engine 110.
Initially, a fuel and/or energy source is provided 710. The fuel is optionally from the external energy source 150. The energy source 150 is a source of: radiation, such as solar; vibration, such as an acoustical energy; and/or heat, such as convection. Optionally the fuel is from an external combustion chamber 154 or a waste heat source, such as from a power plant, or from the rotary engine 100.
Throughout operation process 700, a first parent task circulates the fuel 760 through a closed loop or an open loop. The closed loop cycles sequentially through: heating the fuel 720; injecting the fuel 730 into the rotary engine 110; expanding the fuel 742 in the reference expansion chamber; one or both of exerting an expansive force 743 on the double offset rotor 440 and exerting a vortical force 744 on the double offset rotor 440; rotating the rotor 746 to drive an external process, described infra; exhausting the fuel 748; condensing the fuel 750, and repeating the process of circulating the fuel 760. Preferably, the external energy source 150 provides the energy necessary in the heating the fuel step 720. Individual steps in the operation process are further described, infra.
Throughout the operation process 700, an optional second parent task maintains temperature 770 of at least one rotary engine 110 component. For example, a sensor senses engine temperature 772 and provides the temperature input to a controller of engine temperature 774. The controller directs or controls a heater 776 to heat the engine component. Preferably, the temperature controller 770 heats at least the first expansion chamber 335 to an operating temperature in excess of the vapor-point temperature of the fuel. Preferably, at least the first three expansion chambers 335, 345, 355 are maintained at an operating temperature exceeding the vapor-point of the fuel throughout operation of the rotary engine system 100. Preferably, the fluid heater 140 is simultaneously heating the fuel to a temperature proximate but less than the vapor-point temperature of fluid. Hence, when the fuel is injected through the injector 160 into the first expansion chamber 335, the fuel flash vaporizes exerting expansive force 743 and starts to rotate due to reference chamber geometry and rotation of the rotor to form the vortical force 744.
The fuel is optionally any fuel that expands into a vapor, gas, and/or gas-vapor mix where the expansion of the fuel releases energy used to drive the double offset rotor 440. The fuel is preferably a liquid component and/or a fluid that phase changes to a vapor phase at a very low temperature and has a significant vapor expansion characteristic. Fuels and energy sources are further described, infra.
In task 720, the fluid heater 140 preferably superheats the fuel to a temperature greater than or equal to a vapor-point temperature of the fuel. For example, if a plasmatic fluid is used as the fuel, the fluid heater 140 heats the plasmatic fluid to a temperature greater than or equal to a vapor-point temperature of the plasmatic fluid.
In a task 730, the injector 160 injects the heated fuel, via an inlet port 162, into the reference cell, which is the first expansion chamber 335 at time of fuel injection into the rotary engine 110. When the fuel is superheated, the fuel flash-vaporizes and expands 742, which exerts one of more forces on the double offset rotor 440. A first force is an expansive force 743 resultant from the phase change of the fuel from predominantly a liquid phase to substantially a vapor and/or gas phase. The expansive force acts on the double offset rotor 440 as described, supra, and is represented by force, F, in FIG. 4 and is illustratively represented as expansive force vectors 620 in FIG. 6. A second force is a vortical force 744 exerted on the double offset rotor 440. The vortical force 744 is resultant of geometry of the reference cell, which causes a vortex or rotational movement of the fuel in the chamber based on the geometry of the injection port, rotor chamber face 442 of the double offset rotor 440, inner wall of the housing 210, first end plate 212, second end plate 214, and the extended vane 450 and is illustratively represented as vortex force vectors 625 in FIG. 6. A third force is a hydraulic force of the fuel pushing against the leading vane as the inlet preferably forces the fuel into the leading vane upon injection of the fuel 730. A fourth force results from passage of the fuel through a passageway in the rotary engine 100 resulting in an electromagnetically generated field or force. The hydraulic force exists early in the power stroke before the fluid is flash-vaporized. All of the hydraulic force, the expansive force vectors 620, vortex force vectors 625, and/or electromagnetic force optionally simultaneously exist in the reference cell, in the first expansion chamber 335, second expansion chamber 345, and third expansion chamber 355.
When the fuel is introduced into the reference cell of the rotary engine 110, the fuel begins to expand hydraulically and/or about adiabatically in a task 740. The expansion of the fuel in the reference cell begins the power stroke or power cycle of the engine, described infra. In a task 746, the hydraulic and about adiabatic expansion of fuel exerts the expansive force 743 upon a leading vane 450 or upon the surface of the vane 450 proximate or bordering the reference cell in the direction of rotation 390 of the double offset rotor 440. Simultaneously, in a task 744, a vortex generator, generates a vortex 625 within the reference cell, which exerts a vortical force 744 upon the leading vane 450. The vortical force 744 adds to the expansive force 743 and contributes to rotation 390 of rotor 450 and shaft 220. Alternatively, either the expansive force 743 or vortical force 744 causes the leading vane 450 to move in the direction of rotation 390 and results in rotation of the rotor 746 and shaft 220. Examples of a vortex generator include: an aerodynamic fin, a vapor booster, a vane wingtip, expansion chamber geometry, valving, inlet port 162 orientation, an exhaust port booster, and/or power shaft injector inlet.
The about adiabatic expansion resulting in the expansive force 743 and the generation of a vortex resulting in the vortical force 744 continue throughout the power cycle of the rotary engine, which is nominally complete at about the six o'clock position of the reference cell. Thereafter, the reference cell decreases in volume, as in the first reduction chamber 365, second reduction chamber 375, and third reduction chamber 385. In a task 748, the fuel is exhausted or released 748 from the reference cell, such as through exhaust grooves cut through the housing 210, first end plate 212, and/or second end plate 214 at or about the seven o'clock to ten o'clock position and optionally at about a six, seven, eight, nine, or ten o'clock position. The exhausted fuel is optionally discarded in a non-circulating system. Preferably, the exhausted fuel is condensed 750 to liquid form in the condenser 120, optionally stored in the reservoir 130, and recirculated 760, as described supra.
Fuel
Fuel is optionally any liquid or liquid/solid mixture that expands into a vapor, vapor-solid, gas, gas-solid, gas-vapor, gas-liquid, gas-vapor-solid mix where the expansion of the fuel releases energy used to drive the double offset rotor 440. The fuel is preferably substantially a liquid component and/or a fluid that phase changes to a vapor phase at a very low temperature and has a significant vapor expansion characteristic. Additives into the fuel and/or mixtures of fuels include any permutation and/or combination of fuel elements described herein. A first example of a fuel is any fuel that both phase changes to a vapor at a very low temperature and has a significant vapor expansion characteristic for aid in driving the double offset rotor 440, such as a nitrogen and/or an ammonia based fuel. A second example of a fuel is a diamagnetic liquid fuel. A third example of a fuel is a liquid having a permeability of less than that of a vacuum and that has an induced magnetism in a direction opposite that of a ferromagnetic material. A fourth example of a fuel is a fluorocarbon, such as Fluorinert liquid FC-77® (3M, St. Paul, Minn.), 1,1,1,3,3-pentafluoropropane, and/or Genetron® 245fa (Honeywell, Morristown, N.J.). A fifth example of a fuel is a plasmatic fluid composed of a non-reactive liquid component to which a solid component is added. The solid component is optionally a particulate held in suspension within the liquid component. Preferably the liquid and solid components of the fuel have a low coefficient of vaporization and a high heat transfer characteristic making the plasmatic fluid suitable for use in a closed-loop engine with moderate operating temperatures, such as below about 400° C. (750° F.) at moderate pressures. The solid component is preferably a particulate paramagnetic substance having non-aligned magnetic moments of the atoms when placed in a magnetic field and that possess magnetization in direct proportion to the field strength. An example of a paramagnetic solid additive is powdered magnetite (Fe3O4) or a variation thereof. The plasmatic fluid optionally contains other components, such as an ester-based fuel lubricant, a seal lubricant, and/or an ionic salt. The plasmatic fluid preferably comprises a diamagnetic liquid in which a particulate paramagnetic solid is suspended as when the plasmatic fluid is vaporized the resulting vapor carries a paramagnetic charge, which sustains an ability to be affected by an electromagnetic field. That is, the gaseous form of the plasmatic fluid is a current carrying plasma and/or an electromagnetically responsive vapor fluid. The exothermic release of chemical energy of the fuel is optionally used as a source of power.
The fuel is optionally an electromagnetically responsive fluid and/or vapor. For example, the electromagnetically responsive fuel contains a salt and/or a paramagnetic material.
The engine system 100 is optionally run in either an open loop configuration or a closed loop configuration. In the open loop configuration, the fuel is consumed and/or wasted. In the closed loop system, the fuel is consumed and/or recirculated.
Power Stroke
The power stroke of the rotary engine 110 occurs when the fuel is expanding exerting the expansive force 743 and/or is exerting the vortical force 744. In a first example, the power stroke occurs from through about the first one hundred eighty degrees of rotation, such as from about the twelve o'clock position to the about six o'clock position. In a second example, the power stroke or a power cycle occurs through about 360 degrees of rotation. In a third example, the power stroke occurs from when the reference cell is in approximately the one o'clock position until when the reference cell is in approximately the six o'clock position. From the one o'clock to six o'clock position, the reference cell preferably continuously increases in volume. The increase in volume allows energy to be obtained from the combination of vapor hydraulics, adiabatic expansion forces 743, the vortical forces 744, and/or electromagnetic forces as greater surface areas on the leading vane are available for application of the applied force backed by simultaneously increasing volume of the reference cell. To maximize use of energy released by the vaporizing fuel, preferably the curvature of housing 210 relative to the rotor 450 results in a radial cross-sectional distance or a radial cross-sectional area that has a volume of space or cross-sectional area within the reference cell that increases at about a golden ratio, φ, as a function of radial angle. The golden ratio is defined as a ratio where the lesser is to the greater as the greater is to the sum of the lesser plus the greater, equation 2.




  
    
      
        
          a
          b
        
        =
        
          b
          
            a
            +
            b
          
        
      
    
    
      
        (
        
          eq
          .
          
            
          
          ⁢
          2
        
        )
      
    
  




Assuming the lesser, a, to be unity, then the greater, b, becomes φ, as calculated in equations 3 to 5.




  
    
      
        
          1
          φ
        
        =
        
          φ
          
            1
            +
            φ
          
        
      
    
    
      
        (
        
          eq
          .
          
            
          
          ⁢
          3
        
        )
      
    
  
  
    
      
        
          φ
          2
        
        =
        
          φ
          +
          1
        
      
    
    
      
        (
        
          eq
          .
          
            
          
          ⁢
          4
        
        )
      
    
  
  
    
      
        
          
            φ
            2
          
          -
          φ
          -
          1
        
        =
        0
      
    
    
      
        (
        
          eq
          .
          
            
          
          ⁢
          5
        
        )
      
    
  




Using the quadratic formula, limited to the positive result, the golden ratio is about 1.618, which is the Fibonacci ratio, equation 6.




  
    
      
        φ
        =
        
          
            
              1
              +
              
                5
              
            
            2
          
          ≅
          1.618033989
        
      
    
    
      
        (
        
          eq
          .
          
            
          
          ⁢
          6
        
        )
      
    
  




Hence, the cross-sectional area of the reference chamber as a function of rotation or the surface area of the leading vane 450 as a function of rotation is preferably controlled by geometry of the rotary engine 110 to increase at a ratio of about 1.4 to and more preferably to increase with a ratio of about 1.5 to 1.7, and still more preferably to increase at a ratio of about 1.618 through any of the power stroke from the one o'clock to about six o'clock position. The ratio is controlled by a combination of one or more of use of: the double offset rotor geometry 400, use of the first cut-out 510 in the housing 210, use of the build-up 610 in the housing 210, and/or use of the second cut-out 520 in the housing. Further, the fuels described maintain about adiabatic expansion to a high ratio of gas/liquid when maintained at a relatively constant temperature by the temperature controller 770.
Expansion Volume
Referring now to FIG. 8 and FIG. 9, an expansion volume of a chamber 800 preferably increases as a function of radial angle through the power stroke/expansion phase of the expansion chamber of the rotary engine, such as from about the twelve o'clock position through about the six o'clock position, where the radial angle, e, is defined by two hands of a clock having a center in the rotor 440. Illustrative of a chamber volume, the expansion chamber 333 is illustrated between: an outer rotor surface 442 of the rotor 440, the inner wall of the housing 410, a trailing vane 451, and a leading vane 453. The trailing vane 451 has a trailing vane chamber side 455 and the leading vane 453 has a leading vane chamber side 454. It is observed that the expansion chamber 333 has a smaller interface area 810, A1, with the trailing vane chamber side 455 and a larger interface area 812, A2, with the leading vane chamber side 454. Fuel expansion forces applied to the rotating vanes 451, 453 are proportional to the interface area. Thus, the trailing vane interface area 810, A1, experiences expansion force one, F1, and the leading vane interface area 812, A2, experience expansion force two, F2. Hence, the net rotational force, FT, is the difference in the forces, according to equation 7.

FT≅F2−F1  (eq. 7)

The force calculation according to equation 7 is an approximation and is illustrative in nature. However, it is readily observed that the net turning force in a given expansion chamber is the difference in expansive force applied to the leading vane 453 and the trailing vane 451. Hence, the use of the any of: the single offset rotary engine 300, the double offset rotary engine 400, the first cutout 510, the build-up 610, and/or the second cutout 520, which allow a larger cross-section of the expansion chamber as a function of radial angle yields more net turning forces on the rotor 440. Referring still to FIG. 9, to further illustrate, the cross-sectional area of the expansion volume 333 described in FIG. 8 is illustrated in FIG. 9 at three radial positions. In the first radial position, the cross-sectional area of the expansion volume 333 is illustrated as the area defined by points B1, C1, F1, and E1. The cross-sectional area of the expansion chamber 333 is observed to expand at a second radial position as illustrated by points B2, C2, F2, and E2. The cross-sectional area of the expansion chamber 333 is observed to still further expand at a third radial position as illustrated by points B3, C3, F3, and E3. Hence, as described supra, the net rotational force turns the rotor 440 due to the increase in cross-sectional area of the expansion chamber 333 as a function of radial angle.
Referring still to FIG. 9, a rotor cutout expansion volume is described that yields a yet larger net turning force on the rotor 440. As illustrated in FIG. 3, the outer surface of rotor 320 is circular. As illustrated in FIG. 4, the outer surface of the rotor 442 is optionally geometrically shaped to increase the distance between the outer surface of the rotor and the inner wall of the housing 420 as a function of radial angle through at least a portion of an expansion chamber 333. Optionally, the rotor 440 has an outer surface proximate the expansion chamber 333 that is concave. Preferably, the outer wall of rotor 440 includes walls next to each of: the end plates 212, 214, the trailing edge of the rotor, and the leading edge of the rotor. The concave rotor chamber is optionally described as a rotor wall cavity, a ‘dug-out’ chamber, or a chamber having several sides partially enclosing an expansion volume larger than an expansion chamber having an inner wall of a circular rotor. The ‘dug-out’ volume optionally increases as a function of radial angle within the reference expansion cell, illustrated as the expansion chamber or expansion cell 333. Referring still to FIG. 9, the ‘dug-out’ rotor 444 volume of the rotor 440 is observed to expand with radial angle theta, θ, and is illustrated at the same three radial angles as the expansion volume cross-sectional area. In the first radial position, the cross-section of the ‘dug-out’ rotor 444 volume is illustrated as the area defined by points A1, B1, E1, and D1. The cross-sectional area of the ‘dug-out’ rotor 440 volume is observed to expand at the second radial position as illustrated by points A2, B2, E2, and D2. The cross-sectional area of the ‘dug-out’ rotor 444 is observed to still further expand at the third radial position as illustrated by points A3, B3, E3, and D3. Hence, as described supra, the rotational forces applied to the leading rotor surface exceed the forces applied to the trailing rotor edge yielding a net expansive force applied to the rotor 440, which adds to the net expansive forces applied to the vane, FT, which turns the rotor 440. The ‘dug-out’ rotor 444 volume is optionally machined or cast at time of rotor creation and the term ‘dug-out’ is descriptive in nature of shape, not of a creation or manufacture process of the dug-out rotor 444.
The overall volume of the expansion chamber 333 is increased by removing a portion of the rotor 440 to form the dug-out rotor. The increase in the overall volume of the expansion chamber using a dug-out rotor enhances rotational force of the rotary engine 110 and/or efficiency of the rotary engine.
Vane Seals/Valves
Seals
Referring now to FIG. 10, an example of a vane 450 is provided. Preferably, the vane 450 includes about six seals, including: a lower trailing vane seal 1026, a lower leading seal 1027, an upper trailing seal 1028, an upper leading seal 1029, an inner seal, and/or an outer seal. The lower trailing seal 1026 and lower leading seal 1027 are (1) attached to the vane 450 and (2) move or slide with the vane 450. The upper trailing seal 1028 and upper leading seal 1029 are preferably (1) attached to the rotor 440 and (2) do not move relative to the rotor 440 as the vane 450 moves. Both the lower trailing seal 1026 and upper trailing seal 1028 optionally operate as valves, as described infra. Each of the seals 1026, 1027, 1028, 1029 restrict and/or stop expansion of the fuel between the rotor 440 and vane 450.
Fuel Routing/Valves
Still referring to FIG. 10, in another embodiment, gas or fluid fuels are routed from an expansion chamber 333 into one or more rotor conduits 1020 leading from the expansion chamber 333 to the rotor-vane chamber or rotor-vane slot 452 on a shaft 220 side of the vane 450 in the rotor guide. The expanding fuel optionally runs through the rotor 440, to the rotor channel guiding a vane 452, into the vane 450, and/or a into a tip of the vane 450. Fuel routing paths additionally optionally run through the shaft 220 of the rotary engine 110, through piping, and into the rotor-vane chamber 452.
Referring now to FIG. 11, an example of a rotor 440 having fuel routing paths 1100 is provided. The fuel routing paths, valves, and seals are all optional. Upon expansion and/or flow, fuel in the expansion chamber 333 enters into a first rotor conduit, tunnel, or fuel pathway 1022 running from the expansion chamber 333 or rotor dug-out chamber 444 to the rotor-vane chamber 452. The rotor-vane chamber 452: (1) aids in guiding movement of the vane 450 and (2) optionally provides a partial containment chamber for fuel from the expansion chamber 333 as described herein and/or as a partial containment chamber from fuel routed through the shaft 220, as described infra.
In an initial position of the rotor 440, such as for the first expansion chamber at about the two o'clock position, the first rotor conduit 1022 terminates at the lower trailing vane seal 1026, which prevents further expansion and/or flow of the fuel through the first rotor conduit 1022. Stated again, the lower trailing vane seal 1026 functions as a valve that is off or closed in the two o'clock position and on or open at a later position in the power stroke of the rotary engine 110, as described infra. The first rotor conduit 1022 optionally runs from any portion of the expansion chamber 333 to the rotor vane guide, but preferably runs from the expansion chamber dug-out volume 444 of the expansion chamber 333 to an entrance port either sealed by lower trailing vane seal 1026 or through an opening into the rotor vane guide or rotor-vane chamber 452 on an inner radial side of the vane 450, which is the side of the vane closest to the shaft 220. The cross-sectional geometry of the first rotor conduit 1022 is preferably circular, but is optionally of any geometry. An optional second rotor conduit 1024 runs from the expansion chamber to the first rotor conduit 1022. Preferably, the first rotor conduit 1022 includes a cross-sectional area at least twice that of a cross-sectional area of the second rotor conduit 1024. The intersection of the first rotor conduit 1022 and second rotor conduit 1024 is further described, infra.
As the rotor 440 rotates, such as to about the four o'clock position, the vane 450 extends toward the inner wall of the housing 430. As described supra, the lower trailing vane seal 1026 is preferably affixed to the vane 450 and hence moves, travels, translates, and/or slides with the vane. The extension of the vane 450 results in outward radial movement of the lower vane seals 1026, 1027. Outward radial movement of the lower trailing vane seal 1026 opens a pathway, such as opening of a valve, at the lower end of the first rotor conduit 1022 into the rotor-vane chamber 452 or the rotor guiding channel on the shaft 220 side of the vane 450. Upon opening of the lower trailing vane seal or valve 1026, the expanding fuel enters the rotor vane chamber 452 behind the vane and the expansive forces of the fuel aid centrifugal forces in the extension of the vane 450 toward the inner wall of the housing 430. The lower vane seals 1026, 1027 hinder and preferably stop flow of the expanding fuel about outer edges of the vane 450. As described supra, the upper trailing vane seal 1028 is preferably affixed to the rotor 440, which results in no movement of the upper vane seal 1028 with movement of the vane 450. The optional upper vane seals 1028, 1029 hinder and preferably prevent direct fuel expansion from the expansion chamber 333 into a region between the vane 450 and rotor 440.
As the rotor 440 continues to rotate, the vane 450 maintains an extended position keeping the lower trailing vane seal 1026 in an open position, which maintains an open aperture at the terminal end of the first rotor conduit 1022. As the rotor 440 continues to rotate, the inner wall 430 of the housing forces the vane 450 back into the rotor guide, which forces the lower trailing vane seal 1026 to close or seal the terminal aperture of the first rotor conduit 1022.
During a rotation cycle of the rotor 440, the first rotor conduit 1022 provides a pathway for the expanding fuel to push on the back or rotationally trailing side of the vane 450 during the power stroke. The moving lower trailing vane seal 1026 functions as a valve opening the first rotor conduit 1022 near the beginning of the power stroke and further functions as a valve closing the rotor conduit 1022 pathway near the end of the power stroke.
Concurrently, the upper trailing vane seal 1028 functions as a second valve. The upper trailing vane seal 1028 valves an end of the vane conduit 1025 proximate the expansion chamber 333. For example, at about the ten o'clock and twelve o'clock positions, the upper trailing vane seal 1028 functions as a closed valve to the vane conduit 1025. Similarly, in the about four o'clock and six o'clock positions, the upper trailing vane seal functions as an open valve to the vane conduit 1025.
Optionally, the expanding fuel is routed through at least a portion of the shaft 220 to the rotor-vane chamber 452 in the rotor guide on the inner radial side of the vane 450, as discussed infra.
Vane Conduits
Referring now to FIG. 12, in yet another embodiment the vane 450 includes a fuel conduit 1200. In this embodiment, expanding fuel moves from the rotor-vane chamber 452 in the rotor guide at the inner radial side of the vane 450 into one or more vane conduits. Preferably 2, 3, 4 or more vane conduits are used in the vane 450. For clarity, a single vane conduit is used in this example. The single vane conduit, first vane conduit 1025, runs about longitudinally along at least fifty percent of the length of the vane 450 and terminates along a trailing edge of the vane 450 into the expansion chamber 333. Hence, fuel runs and/or expands sequentially: from the inlet port 162, through the expansion chamber 333, through a rotor conduit 1020, such as the first rotor conduit 1022 and/or second rotor conduit 1024, to the rotor-vane chamber 452 at the inner radial side of the vane 450, through a portion of the vane in the first vane conduit 1025, and exits or returns into the same expansion chamber 333. The exit of the first vane conduit 1025 from the vane 450 back to the expansion chamber 333 or trailing expansion chamber is optionally through a vane exit port on the trailing edge of the vane and/or through a trailing portion of the T-form vane head. The expanding fuel exiting the vane provides a turbo effect and/or a rotational force aiding in rotation 390 of the rotor 450 about the shaft 220. The combined turbo effect with the expansion cycle or Rankine cycle yields a turbo-Rankine engine or a turbo-Rankine heat cycle engine. The upper trailing vane seal 1028 controls timing of opening and closing of a pressure equalization path between the expansion chamber 333 and the rotor vane chamber 452. Preferably, the exit port from the vane conduit to the trailing expansion chamber couples two vane conduits into a vane flow booster 1340. The vane flow booster 1340 is a species of a flow booster 1300, described infra. The vane flow booster 1340 uses fuel expanding and/or flowing a first vane flow channel to accelerate fuel expanding into the expansion chamber 333.
Flow Booster
Referring now to FIG. 13, an optional flow booster 1300 or amplifier accelerates movement of the gas/fuel in the first rotor conduit 1022. In this description, the flow booster is located at the junction of the first rotor conduit 1022 and second rotor conduit 1024. However, the description applies equally to flow boosters located at one or more exit ports of the fuel flow path exiting the vane 450 into the trailing expansion chamber. In this example, fuel in the first rotor conduit 1022 optionally flows from a region having a first cross-sectional distance 1310, d1, through a region having a second cross-sectional distance 1320, d2, where d1>d2. At the same time, fuel and/or expanding fuel flows through the second rotor conduit 1024 and optionally circumferentially encompassed an about cylindrical barrier separating the first rotor conduit 1022 from the second rotor conduit 1024. The fuel in the second rotor conduit 1024 passes through an exit port 1330 and mixes and/or forms a vortex with the fuel exiting out of the cylindrical barrier, which accelerates the fuel traveling through the first rotor conduit 1022.
Branching Vane Conduits
Referring now to FIG. 14, in yet another embodiment, expanding fuel moves from the rotor-vane chamber 452 in the rotor guide at the inner radial side of the vane 450 into a branching vane conduit. For example, the first vane conduit 1025 runs about longitudinally along at least fifty percent of the length of the vane 450 and branches into at least two branching vane conduits, where each of the branching vane conduits exit the vane 450 into the trailing expansion chamber 333. For example, the first vane conduit 1025 branches into a first branching vane conduit 1410 and a second branching vane conduit 1420, which each exit to the trailing expansion chamber 333.
Multiple Fuel Lines
Referring now to FIG. 15, in still yet an additional embodiment, fuel additionally enters into the rotor-vane chamber 452 through as least a portion of the shaft 220. Referring now to FIG. 15A, a shaft 220 is illustrated. The shaft optionally includes an internal insert 224. The insert 224 remains static while wall 222 of the shaft 220 rotates about the insert 224 on one or more bearings 229. Fuel, preferably under pressure, flows from the insert 224 through an optional valve 226 into a fuel chamber 228, which rotates with the shaft wall 222. Referring now to FIG. 15B, a flow tube 1510, which rotates with the shaft wall 222 transports the fuel from the rotating fuel chamber 228 and optionally through the rotor-vane chamber 450 where the fuel enters into a vane conduit 1520, which terminates at the trailing expansion chamber 333. The pressurized fuel in the static insert 224 expands before entering the expansion chamber and the force of expansion and/or directional booster force of propulsion provides tortional force against the rotor 440 to force the rotor to rotate. Optionally, a second vane conduit is used in combination with a flow booster to enhance movement of the fuel into the expansion chamber adding additional expansion and directional booster forces. Upon entering the expansion chamber 333, the fuel may proceed to expand through any of the rotor conduits 1020, as described supra.
Vanes
Referring now to FIG. 16A, a sliding vane 450 is illustrated relative to a rotor 440 and the inner wall 432 of the housing 210. The housing inner wall or inner wall 432 is exemplary of the inner wall of any rotary engine housing. Referring still to FIG. 16A and now referring to FIG. 16B, the vane 450 is illustrated in a perspective view. The vane includes a vane body 1610 between a vane base 1612, and vane end 1614. The vane end 1614 is proximate the inner housing 432 during use. The vane 450 has a leading face 1616 proximate a leading chamber 334 and a trailing face 1618 proximate a trailing chamber or reference expansion chamber 333. In one embodiment, the leading face 1616 and trailing face 1618 of the vane 450 extend as about parallel edges, sides, or faces from the vane base 1612 to the vane end 1614. Optional vane wing tips or vane extensions are described, infra. Herein, the leading chamber 334 and reference expansion chamber 333 are both expansion chambers. The leading chamber 334 and reference expansion chamber 333 are chambers on opposite sides of a vane 450.
Vane Axis
The vanes 450 rotate with the rotor 440 about a rotation point and/or about the shaft 220. Hence, a localized axis system is optionally used to describe elements of the vane 450. For a static position of a given vane, an x-axis runs through the vane body 1610 from the trailing chamber or 333 to the leading chamber 334, a y-axis runs from the vane base 1612 to the vane end 1614, and a z-axis is normal to the x-, y-plane, such as defining the thickness of the vane. Hence, as the vane rotates, the axis system rotates and each vane has its own axis system at a given point in time.
Vane Head
Referring now to FIG. 17, the vane 450 optionally includes a replaceably attachable vane head 1611 attached to the vane body 1610. The replaceable vane head 1611 allows for separate machining and ready replacement of the vane wings 1620, 1630 and vane tip 1614 elements. Optionally the vane head 1611 hinges, snaps, or slides onto the vane body 1610.
Vane Caps/Vane Seals
Preferably vane extensions or vane caps, not illustrated, cover the upper and lower surface of the vane 450. For example, an upper vane cap covers the entirety of the upper z-axis surface of the vane 450 and a lower vane cap covers the entirety of the lower z-axis surface of the vane 450. Optionally the vane caps function as seals or seals are added to the vane caps.
Vane Movement
The vane 450 optionally slidingly moves along and/or within the rotor-vane chamber or rotor-vane slot 452. The edges of the rotor vane slot 452 function as guides to restrict movement of the vane along the y-axis. The vane movement moves the vane body, in a reciprocating manner, toward and then away from the housing inner wall 432. Referring now to FIG. 16A, the vane base 1612 of the vane 450 is illustrated at a fully retracted position into the rotor-vane channel 452 at a first time, t1, and at a fully extended position at a second time, t2.
Vane Wing-Tips
Herein vane wings or vane extensions are defined, which protrude or extend away from the vane body 1610 along the x-axis. Referring again to FIG. 16, certain elements are described for a leading vane wing 1620, that extends into the leading chamber 334 and certain elements are described for a trailing wing 1630, that extends into the expansion chamber 333. Any element described with reference to the leading vane wing 1620 is optionally applied to the trailing wing 1630. Similarly, any element described with reference to the trailing wing 1630 is optionally applied to the leading wing 1620. Further, the rotary engine 110 optionally runs clockwise, counter clockwise, and/or is reversible from clock-wise to counter clockwise rotation.
Still referring to FIG. 16, optional vane ends are illustrated. Optionally, one or more of a leading vane wing-tip 1620 and a trailing wing tip 1630 are added to the vane 450. The leading wing-tip 1620 extends from about the vane end 1614 into the leading chamber 334 and the trailing wing-tip 1630 extends from about the vane end 1614 into the trailing chamber or reference expansion chamber 333. The leading wing-tip 1620 and trailing wing-tip 1630 are optionally of any geometry. However, the preferred geometry of the wing-tips reduces chatter or vibration of the vane ends against the outer housing during operation of the engine. Chatter is unwanted opening and closing of the seal between expansion chamber 333 and leading chamber 334. The unwanted opening and closing results in unwanted release of pressure from the expansion chamber 333, because the vane end 1614 is pushed away from the inner wall 432 of the housing, with resulting loss of expansion chamber 333 pressure and rotary engine 110 power.
In one example, the outer edge of the wing-tips 1620, 1630, proximate the inner wall 432, are progressively further from the inner wall 432 as the wing-tip extends away from the vane end 1614 along the x-axis. In another example, a distance between the inner edge of the wing-tip 1634 and the inner housing 432 decreases along a portion of the x-axis versus a central x-axis point of the vane body 1610. Some optional wing-tip shape elements include:

    
    
        an about perpendicular wing-tip bottom 1634 adjoining the vane body 1610;
        a curved wing-tip surface proximate the inner housing 432;
        an outer vane wing-tip surface extending further from the housing inner wall 432 with increasing x-axis or rotational distance from a central point of the vane end 1614;
        an inner vane wing-tip surface 1634 having a decreasing y-axis distance to the housing inner wall 432 with increasing x-axis or rotational distance from a central point of the vane end 1614; and
        a three, four, five, six, or more sided polygon perimeter in an x-, y-cross-sectional plane of an individual wing tip, such as the leading wing-tip 1620 or trailing wing-tip 1630.
    
    


Further examples of wing-tip shapes are illustrated in connection with optional wing-tip pressure elements and vane caps, described infra.
A t-shaped vane refers to a vane 450 having both a leading wing-tip 1620 and trailing wing-tip 1630.
Vane End Components
Referring now to FIG. 17, examples of optional vane end 1614 components are illustrated. Preferred vane end 1614 components include:

    
    
        one or more bearings for bearing the centrifugal force of the vane 450 applied to the inner housing 420;
        one or more seals for providing a seal between the leading chamber 334 and the expansion chamber 333;
        one or more pressure relief cuts for reducing pressure build-up between the vane wings 1620, 1630 and the inner wall 432 of the housing; and
        a booster enhancing pressure equalization above and below a vane wing.
    
    


Each of the bearings, seals, pressure relief cuts, and/or boosters are further described herein.
Bearings
The vane end 1614 optionally includes a roller bearing 1740. The roller bearing 1740 preferably takes a majority of the force of the vane 450 applied to the inner housing 432, such as fuel expansion forces and/or centrifugal forces. The roller bearing 1740 is optionally an elongated bearing or a ball bearing. An elongated bearing is preferred as the elongated bearing distributes the force of the vane 450 across a larger portion of the inner housing 432 as the rotor 440 turns about the shaft 220, which minimizes formation of a wear groove on the housing inner wall 432. The roller bearing 1740 is optionally one, two, three, or more bearings. Preferably, each roller bearing is spring loaded to apply an outward force of the roller bearing 1740 into the inner wall 432 of the housing. The roller bearing 1740 is optionally magnetic.
Seals
Still referring to FIG. 17, the vane end 1614 preferably includes one or more seals affixed to the vane 450. The seals provide a barrier between the leading chamber 334 and the expansion chamber 333. A first vane end seal 1730 example comprises a seal affixed to the vane end 1614, where the vane-seal includes a longitudinal seal running along the z-axis from about the top of the vane 1617 to about the bottom of the vane 1619. The first-vane seal 1730 is illustrated as having an arched longitudinal surface. A second vane end seal 1732 example includes a flat edge proximately contacting the housing inner wall 432 during use. Optionally, for each vane 450, one, two, three, or more vane seals are configured to provide proximate contact between the vane end 1614 and housing inner wall 432. Optionally, the vane-seals 1730, 1732 are fixedly and/or replaceably attached to the vane 450, such as by sliding into a groove in the vane-tip running along the z-axis. Preferably, the vane-seal comprises a plastic, fluoropolymer, flexible, and/or rubber seal material.
Pressure Relief Cuts
As the vane 450 rotates, a resistance pressure builds up between the vane end 1614 and the housing inner wall 432 that results in chatter. For example, pressure builds up between the leading wing-tip surface 1710 and the housing inner wall 432. Pressure between the vane end 1614 and housing inner wall 432 results in vane chatter and inefficiency of the engine.
The leading wing-tip 1620 optionally includes a leading wing-tip surface 1710. The leading wing-tip surface 1710, which is preferably an edge running along the z-axis, cuts, travels, and/or rotates through air and/or fuel in the leading chamber 334.
The leading vane wing-tip 1620 optionally includes: a cut, aperture, hole, fuel flow path, air flow path, and/or tunnel 1720 cut through the leading wing-tip along the y-axis. The cut 1720 is optionally one, two, three, or more cuts. As air/fuel pressure builds between the leading wing-tip surface 1710 or vane end 1614 and the housing inner wall 432, the cut 1720 provides a pressure relief flow path 1725, which reduces chatter in the rotary engine 110. Hence, the cut or tunnel 1720 reduces build-up of pressure, resultant from rotation of the engine vanes 450 about the shaft 220, proximate the vane end 1614. The cut 1720 provides an air/fuel flow path 1725 from the leading chamber 334 to a volume above the leading wing-tip surface 1710, through the cut 1720, and back to the leading chamber 334. Any geometric shape that reduces engine chatter and/or increases engine efficiency is included herein as possible wing-tip shapes.
Still referring to FIG. 17, the vane end 1614 optionally includes one or more trailing: cuts, apertures, holes, fuel flow paths, air flow paths, and/or tunnels 1750 cut through the trailing wing-tip 1630 along the y-axis. The trailing cut 1750 is optionally one, two, three, or more cuts. As fuel expansion pressure builds between the trailing edge tip 1750 or vane end 1614 and the housing inner wall 432, the cut 1750 provides a pressure relief flow path 1755, which reduces chatter in the rotary engine 110. Hence, the cut or tunnel 1750 reduces build-up of pressure, resultant from rotation of the engine vanes 450 about the shaft 220, proximate the vane end 1614. The cut 1750 provides an air/fuel flow path 1755 from the expansion chamber 333 to a volume above the trailing wing-tip surface 1760, through the cut 1750, and back to the trailing chamber 333. Any geometric shape that reduces engine chatter and/or increases engine efficiency is included herein as possible wing-tip shapes.
Vane Wing
Referring now to FIG. 18, a cross-section of the vane 450 is illustrated having several optional features including: a curved outer surface, a curved inner surface, and a curved tunnel, each described infra.
The first optional feature is a curved outer surface 1622 of the leading vane wing 1620. In a first case, the curved outer surface 1622 extends further from the inner wall of the housing 432 as a function of x-axis position relative to the vane body 1610. For instance, at a first x-axis position, x1, there is a first distance, d1, between the outer surface 1622 of the wing 1620 and the inner housing 432. At a second position, x2, further from the vane body 1610, there is a second distance, d2, between the outer surface 1622 of the wing 1620 and the inner housing 432 and the second distance, d2, is greater than the first distance, d1. Preferably, there are positions on the outer surface 1622 of the leading wing 1620 where the second distance, d2, is about two, four, or six times as large as the first distance, d1. In a second case, the outer surface 1622 of the leading wing 1620 contains a negative curvature section 1623. The negative curvature section 1623 is optionally described as a concave region. The negative curvature section 1623 on the outer surface 1622 of the leading wing 1620 allows the build-up 610 and the cut-outs 510, 520 in the housing as without the negative curvature 1623, the vane 450 mechanically catches or physically interferes with the inner wall of the housing 432 with rotation of the vane 450 about the shaft 220 when using a double offset housing 430.
The second optional feature is a curved inner surface 1624 of the leading vane wing 1620. The curved inner surface 1624 extends further toward the inner wall of the housing 432 as a function of x-axis position relative to the vane body 1610. Stated differently, the inner surface 1624 of the leading vane curves away from a reference line 1625 normal to the vane body at the point of intersection of the vane body 1610 and the leading vane wing 1620. For instance, at a third x-axis position, x3, there is a third distance, d3, between the outer surface 1622 of the wing 1620 and the reference line 1625. At a fourth position, x4, further from the vane body 1610, there is a fourth distance, d4, between the outer surface 1622 of the wing 1620 and the reference line 1625 and the fourth distance, d4, is greater than the third distance, d3. Preferably, there are positions on the outer surface 1622 of the leading wing 1620 where the fourth distance, d4, is about two, four, or six times as large as the third distance, d3.
The third optional feature is a curved fuel flow path 2010 running through the leading vane wing 1620, where the fuel flow path is optionally described as a hole, aperture, and/or tunnel. The curved fuel flow path 2010 includes an entrance opening 2012 and an exit opening 2014 of the fuel flow path 2010 in the leading vane wing 1620. The edges of the fuel flow path are preferably curved, such as with a curvature approximating an aircraft wing. A distance from the vane wing-tip 1710 through the fuel flow path 2010 to the inner surface at the exit port 2014 of the leading wing 1624 is longer than a distance from the vane wing-tip 1710 to the exit port 2014 along the inner surface 1624 of the leading wing 1620. Hence, the flow rate of the fuel through the fuel flow path 2010 maintains a higher velocity compared to the fuel flow velocity along the base 1624 of the leading wing 1620, resulting in a negative pressure between the leading wing 1620 and the inner housing 432. The negative pressure lifts the vane 450 toward the inner wall 432, which lifts the vane tip 1614 along the y-axis to proximately contact the inner housing 432 during use of the rotary engine 110. The fuel flow path 2010 additionally reduces unwanted pressure between the leading wing 1620 and inner housing 432, where excess pressure results in detrimental engine chatter.
Trailing Wing
Referring now to FIG. 19, an example of a trailing cut 1750 in a vane 450 trailing wing 1630 is illustrated. For clarity, only a portion of vane 450 is illustrated. The trailing wing 1630 is illustrated, but the elements described in the trailing wing-tip 1630 are optionally used in the leading wing 1620. The optional hole or aperture 1750 leads from an outer area 1920 of the wing-tip to an inner area 1930 of the wing-tip. Referring now to FIG. 19A, a cross-section of a single hole 1940 having about parallel sides is illustrated. The aperture aids in equalization of pressure in an expansion chamber between an inner side of the wing-tip and an outer side of the wing-tip.
Still referring to FIG. 19A, a single aperture 1750 is illustrated. Optionally, a series of holes 1750 are used where the holes are separated along the z-axis. Optionally, the series of holes are connected to form a groove similar to the cut 1720. Similarly, groove 1720 is optionally a series of holes, similar to holes 1750.
Referring now to FIG. 19B, a vane 450 having a trailing wing 1630 with an optional aperture 1942 configuration is illustrated. In this example, the optional aperture 1942 expands from a first cross-sectional distance at the outer area of the wing 1920 to a larger second cross-sectional distance at the inner area of the wing 1930. Preferably, the second cross-sectional distance is at least 11⁄2 times that of the first cross-sectional distance and optionally about two, three, or four times that of the first cross-sectional distance.
Booster
Referring now to FIG. 20, an example of a vane 450 having a booster 1300 is provided. The booster 1300 is applied in a vane booster 2011 configuration. The flow along the trailing pressure relief flow path 1755, is optionally boosted or amplified using flow through the vane conduit 1025. Flow from the vane conduit runs along a vane flow path 2040 to an acceleration chamber 2042 at least partially about the trailing flow path 1755. Flow from the vane conduit 1025 exits the trailing wing 1630 through one or more exit ports 2044. The flow from the vane conduit 1025 exiting through the exit ports 2044 provides a partial vacuum force that accelerates the flow along the trailing pressure relief flow path 1755, which aids in pressure equalization above and below the trailing wing 1630, which reduces vane 450 and rotary engine 110 chatter. Preferably, an insert 2012 contains one or more of and preferably all of: the inner area of the wing 1920, the outer area of the wing 1930, the acceleration chamber 2042, and exit port 2044 along with a portion of the trailing pressure relief flow path 1755 and vane flow path 2040.
Swing Vane
In another embodiment, a swing vane 2100 is used in combination with an offset rotor, such as a double offset rotor in the rotary engine 110. More particularly, the rotary engine, using a swing vane separating expansion chambers, is configured for operation with a pressurized fuel or fuel expanding during a rotation of the engine. A swing vane pivots about a pivot point on the rotor and/or pivots about a separate pivot point on or in the housing yielding an expansion chamber separator ranging from the width of the swing vane to the length of the swing vane. The swing vane optionally slidingly extends to dynamically lengthen or shorten the length of the swing vane. The combination of the pivoting and the sliding of the vane allows for use of a double offset rotor in the rotary engine and the use of rotary engine housing wall cut-outs and/or buildups to expand rotary engine expansion chamber volumes with corresponding increases in rotary engine power and/or efficiency.
The swing vane 2100 is optionally used in place of the sliding vane 450. The swing vane 2100 is optionally described as a separator between expansion chambers. For example, the swing vane 2100 separates expansion chamber 333 from leading chamber 334. The swing vane 2100 is optionally used with in combination with any of the elements described herein used with the sliding vane 450.
Swing Vane Rotation
Referring now to FIG. 21A and FIG. 21B, in one example, a swing vane 2100 includes a swing vane base 2110, which is attached to the rotor 440 of a rotary engine 110 at a swing vane rotor pivot 2115. In another embodiment, described infra, the swing vane base 2110 is attached to the housing 430. Preferably, a spring loaded pin provides a rotational force that rotates the swing vane base 2110 about the swing vane pivot 2115. The spring loaded pin additionally provides a dampening force that prevents rapid collapse of the swing vane 2100 back to the rotor 440 after the power stroke in the exhaust phase. The swing vane 2100 pivots about the swing vane pivot 2115 attached to the rotor 440 during use. Since, the swing vane pivots with rotation of the rotor in the rotary engine, the span or reach of the swing vane between the rotor and housing ranges from a narrow width of the swing vane to the length of the swing vane. For example, at about the twelve o'clock position the swing vane 2100 is orientated as if laying on its side and the distance between the rotor 440 and inner housing 432 is the width of the swing vane 2100. Further, at about the three o'clock position the swing vane extends nearly perpendicularly outward from the rotor 440 and the distance between the rotor and the inner housing 432 is the length of the swing vane. Hence, the dynamic pivoting of the swing vane yields an expansion chamber separator ranging from the shorter width of the swing vane to the longer length of the swing vane, which allows use of an offset rotor in the rotary engine.
In another embodiment, the swing vane 2100 pivots about a swing vane housing pivot 2116. In this embodiment one or both of the housing 430 and/or rotor 440 rotate.
In yet another embodiment, the swing vane 2100 pivots about both the swing vane rotor pivot 2115 and the swing vane housing pivot 2116. In this embodiment one or both of the housing 430 and/or rotor 440 rotate.
Swing Vane Extension
Preferably, the swing vane base 2110 includes a straight section or a curved section, slidably or telescopically respectively attached to a straight section or a curved section of a sliding swing vane or a sliding swing vane head 2120. For clarity, only the curved telescoping swing vane is further described herein. For example, the sliding swing vane head 2120 slidingly extends along the curved section of the swing vane base 2110 during use to extend an extension length of the swing vane 2100. A variable size chamber 2150 preferably exists between the swing vane base 2110 and swing vane head 2120. The extension length extends the swing vane 2100 from the rotor 440 into proximate contact with the housing inner wall 432. One or both of the curved sections on the swing vane base 2110 or sliding swing vane head 2120 guides sliding movement of the sliding swing vane head 2120 along the swing vane base 2110 to extend a length of the swing vane 2100. For example, at about the six o'clock position the swing vane extends nearly perpendicularly outward from the rotor 440 and the distance between the rotor and the housing inner wall 432 is the length of the swing vane plus the length of the extension between the sliding swing vane head 2120 and swing vane base 2110. In one case, an inner curved surface of the sliding swing vane head 2120 slides along an outer curved surface of the swing vane base 2110, which is illustrated in FIG. 21A. In a second case, the sliding swing vane inserts into the swing vane base and an outer curved surface of the sliding swing vane slides along an inner curved surface of the swing vane base.
A vane actuator 2130 provides an outward force, where the outward force extends the sliding swing vane head 2120 into proximate contact with the housing wall 432. A first example of vane actuator is a spring attached to either the swing vane base 2110 or to the sliding swing vane head 2120. The spring provides a spring force resulting in sliding movement of the sliding swing vane head 2120 relative to the swing vane base 2110. A second example of vane actuator is a magnet and/or magnet pair where at least one magnet is attached or embedded in either the swing vane base 2110 or to the sliding swing vane head 2120. The magnet provides a repelling magnet force providing a partial internal separation between the swing vane base 2110 from the sliding swing vane head 2120. A third example of vane actuator is a air and/or fuel pressure directed through the swing vane base 2110 to the sliding swing vane head 2120, such as through a sliding vane conduit 2155. The fuel pressure provides an outward sliding force to the sliding swing vane head 2120, which extends the length of the swing vane 2100. The spring, magnet, and fuel vane actuators are optionally used independently or in combination to extend the length of the swing vane 2100 and the actuator operates in combination with centrifugal force of the rotary engine 110.
Referring now to FIG. 21B, swing vanes 2100 are illustrated at various points in rotation and/or extension about the shaft 220. The swing vanes 2100 pivot about the swing vane pivot 2115. Additionally, from about the twelve o'clock position to about the six o'clock position, the swing vane 2100 extends to a greater length through sliding of the sliding swing vane head 2120 along the swing vane base 2110 toward the housing inner wall 432. The sliding of the swing vane 2100 is aided by centrifugal force and optionally with vane actuator 2130 force. From about the six o'clock position to about the twelve o'clock position, the swing vane 2100 length decreases as the sliding swing vane head 2120 slides back along the swing vane base 2110 toward the rotor 440. Hence, during use the swing vane 2100 both pivots and extends. The combination of swing vane 2100 pivoting and extension allows greater reach of the swing vane. The greater reach allows use of the double offset rotor, described supra. The combination of the swing vane 2100 and double offset rotor in a double offset rotary engine 400 yields increased volume in the expansion chamber from about the twelve o'clock position to about the six o'clock position, as described supra. Further, the combination of the pivoting and the sliding of the vane allows for use with a double offset rotary engine having housing wall cut-outs and/or buildups, described supra. The greater volume of the expansion chamber during the power stroke of the rotary engine results in a rotary engine 110 having increased power and/or efficiency.
Rotor-Vane Cut-Out
Optionally, the rotor 440 includes a swing vane rotor cut-out 2125, a swing vane housing build-up 2126, and/or a swing vane housing cut-out 2127, each of which alter the distance between the rotor 440 and the housing inner wall 432 as a function of rotational position. In a first example, the rotor cut-out 2125 allows the swing vane 2100 to fold into the rotor 440, thereby reducing to an about minimum space a first between the rotor 440 and the housing inner wall. More particularly, by folding the swing vane 2100 into the rotor 440, the distance between the rotor 440 ands housing inner wall 432 is reduced allowing a greater double offset position of the rotor 440 relative to the housing 430 as at least a portion of the width of the swing vane 2100 lays in the rotor 440. In a second example, the swing vane housing build-up 2126 moves the housing inner wall 432 closer to the rotor 440, which allows the swing vane 2100 to further lay into the rotor 440 at about the ten o'clock to twelve o'clock position without losing contact with the housing inner wall 432. In a third example, the swing vane housing cut-out 432 allows the swing vane 2100 to pivot outward early in the rotational cycle, such as from about the one o'clock position to about the three o'clock position yielding a expansion chamber 333 with an increasing volume as a function of rotor rotation in the power phase of the engine operation.
Swing Vane Seals
Referring again to FIG. 21A and still to FIG. 21B, the swing vane 2100 proximately contacts the housing inner wall 432 during use at one or more contact points or areas. A first example of a sliding vane seal is a forward sliding vane seal 2142 on an outer surface of the swing vane base 2110. A second example of a sliding vane seal is a rear vane seal 2144 on an outer surface of the sliding swing vane head 2120. Each of the forward seal 2142 and rear seal 2142 are optionally a wiper seal or a double lip seal. A third example of a sliding vane seal is a vane tip seal 2146, where a region of the end of the sliding swing vane head 2120 proximately contacts the housing inner wall 432. The vane tip seal 2146 is optionally a wiper seal, such as a smooth outer surface of the end of the sliding swing vane head 2120, and/or a secondary seal embedded into the wiper seal. At various times in rotation of the rotor 440 about the shaft 220, one or more of the forward seal 2142, rear seal 2144, and vane tip seal 2146 contact the housing inner wall 432. For example, from about the twelve o'clock position to about the eight o'clock position, the vane tip seal 2146 of the sliding swing vane proximately contacts the housing inner wall 432. From about the nine o'clock position to about the twelve o'clock position, first the rear seal 2144 and then both the rear seal 2144 and the forward seal 2142 proximately contact the housing inner wall 432. For example, when the vane 450 is in about the eleven o'clock position both the rear seal 2144 and forward seal 2142 simultaneously proximately contact the inner surface of the second cut-out 520 of the housing inner wall 432. Generally, during one rotation of the rotor 440 and a reference swing vane 2100 about the shaft from the about six o'clock to 12 o'clock position, first the vane tip seal 2146, then the rear seal 2144, then both the rear seal 2144 and forward seal 2142 contact the housing inner wall 432. Generally, during operation the forward seal 2142 rotationally leads the rear seal 2144, which rotationally leads the vane tip seal. Generally, the rear seal 2144 is positioned longitudinally on the swing vane 2100 between the forward seal 2142 and the vane tip seal 2146. The forward seal 2142 is optionally mounted on or is integrated into either the sliding swing vane base 2110 or sliding swing vane head 2120. Similarly, the rear seal 2144 is optionally mounted on or is integrated into either the sliding swing vane base 2110 or sliding swing vane head 2120.
Swing Vane Caps
Preferably a swing vane cap covers each z-axis edge of the swing vane 2100. For example, a first and second swing vane cap covers the innermost and outermost edge of the swing vane, respectively. The two swing vane caps function as a wiper seals, sealing the end plate sides of the swing vane 2100 to the first end plate 212 and second end plate 214, respectively.
Scalability
The swing vane 2100 attaches to the rotor 440 via the swing vane pivot 2115. Since, swing vane movement is controlled by the swing vane pivot 2115, the rotor vane chamber 452 is not necessary. Hence, the rotor 440 does not necessitate the rotor vane chamber 452. When scaling down a rotor 440 guiding a sliding vane 450, the rotor vane chamber 452 limits the minimum size of the rotor. As the swing vane 2100 does not require the rotor vane chamber 452, the diameter of the rotor 440 is optionally about as small as 1⁄4, 1⁄2, 1, or 2 inches or as large as about 1, 2, 3, or 5 feet. Traditional rotary engines have a minimum rotor size of about a two inch diameter.
Cap or Extension
Referring now to FIG. 22, in yet another embodiment dynamic extensions or dynamic caps 2200 or seals seal boundaries between fuel containing regions and surrounding rotary engine 110 elements. For example, extensions or caps 2200 seal boundaries between the reference expansion chamber 333 and surrounding rotary engine elements, such as the rotor 440 and vane 450. Types of extensions or caps 2200 include vane caps, rotor caps, and rotor-vane caps. Generally, dynamic caps float, ride, and/or are carried along an axis normal to the caps outer surface. Herein, vane caps are first described in detail. Subsequently, rotor caps are described using the vane cap description and noting key differences.
More particularly, a rotary engine method and apparatus configured with a dynamic cap seal is described. A dynamic cap 2200 or seal restricts fuel flow from a fuel compartment to a non-fuel compartment and/or fuel flow between fuel compartments, such as between a reference expansion chamber and any of an engine: rotor, vane, housing, and/or a leading or trailing expansion chamber. For a given type of cap, optional sub-cap types exist. In a first example, types of vane caps include: vane-housing caps, vane-rotor caps, and rotor-vane slot caps. As a second example, types of rotor caps include: rotor-slot caps, rotor/expansion chamber caps, and/or inner rotor/shaft caps. Generally, caps float or dynamically move along an axis about normal to an outer surface of the cap. For example, the first vane cap 2210 includes an outer surface 2214, which seals to the housing 210 or an endplate 212, 214. Generally, the outer surface of the cap seals to a rotary engine element, such as a housing 210 or endplate element 212, 214, providing a dynamic seal. Means for providing cap sealing force to seal the cap against a rotary engine housing element comprise one or more of a spring force, a magnetic force, a deformable seal force, and a fuel force. The dynamic caps ability to track a noncircular path while still providing a seal are particularly beneficial for use in a rotary engine having an offset rotor and with a non-circular inner rotary engine compartment having engine wall cut-outs and/or build-ups. For example, the dynamic cap ability to move to form a seal allows the seal to be maintained between a vane and a housing of the rotary engine even with a housing cut-out at about the one o'clock position. Further, the dynamic sealing forces provide cap sealing forces over a range of temperatures and operating engine rotation speeds.
Still more particularly, caps 2200 dynamically move or float to seal a junction between a sealing surface of the cap and a rotary engine component. For example, a vane cap sealing to the housing inner wall 432 dynamically moves along the y-axis until an outer surface of the cap seals to the housing 430.
In one example, caps 2200 function as seals between rotary chambers over a range of operating speeds and temperatures. For the case of operating speeds, the dynamic caps seal the rotary engine chambers at zero revolutions per minute (r.p.m.) and continue to seal the rotary engine compartments as the engine accelerates to operating revolutions per minute, such as about 1000, 2000, 5000, or 10,000 r.p.m. For example, since the caps move along an axis normal to an outer surface and have dynamic means for forcing the movement to a sealed position, the caps seal the engine compartments when the engine is any of: off, in the process of starting, is just started, and or is operating. In an exemplary case, the rotary engine vane 450 is sealed against the rotary engine housing 210 by a vane cap. For the case of operating temperatures, the same dynamic movement of the caps allows function over a range of temperatures. For example, the dynamic cap sealing forces function to apply cap sealing forces when an engine starts, such as at room temperature, and continue to apply appropriate sealing forces as the temperature of the rotary engine increases to operational temperature, such as at about 100, 250, 500, 1000, or 1500 degrees centigrade. The dynamic movement of the caps 2200 is described, infra.
Vane Caps
Still referring to FIG. 22, a vane 450 is optionally configured with one or more dynamic caps 2200. A particular example of a cap 2200 is a vane/endplate cap, which provides a dynamic seal or wiper seal between the vane body 1610 and a housing endplate, such as the first endplate 212 and/or second endplate 214. Vane/endplate caps cover one or both z-axis sides of the vane 450 or swing vane 2100. Referring now to FIG. 22, an example of a first vane cap 2210 and the second vane cap 2220 covering an innermost and an outermost z-axis side of the vane 450, respectively, is provided. The two vane caps 2210, 2220 function as wiper seals, sealing the edges of the vane 450 or swing vane 2100 to the first endplate 212 and second endplate 214, respectively. Preferably, a vane/endplate cap includes one or more z-axis vane cap bearings 2212, which are affixed to the vane body 1610 through the vane cap 2200 and proximately contact the rotary engine endplates 212, 214. For example, FIG. 22 illustrates a first vane cap 2210 configured with five vane cap bearings 2212 that contact the first endplate 212 of the rotary engine 110 during use. Each of the vane/endplate caps elements are further described, infra. The vane/endplate cap elements described herein are exemplary of optional cap 2200 elements.
Herein, for a static position of a given vane, an x-axis runs through the vane body 1610 from the trailing chamber or 333 to the leading chamber 334, a y-axis runs from the vane base 1612 to the vane-tip 1614, and a z-axis is normal to the x-, y-plane, such as defining the thickness of the vane between the first endplate 212 and second endplate 214. Further, as the vane rotates, the axis system rotates and each vane has its own axis system at a given point in time.
Referring now to FIG. 23, an example of a cross-section of a dynamic vane/endplate cap 2300 is provided. The vane/endplate cap 2300 resides on the z-axis between the vane body 1612 and an endplate, such as the first endplate 212 and second endplate 214. In the illustrated example, the first vane cap 2210 resides on the z-axis between the vane body 1610 and the first endplate 212. Further, the vane body 1610 and first vane cap 2210 combine to provide a separation, barrier, and seal between the reference expansion chamber 333 and leading expansion chamber 334. Means for providing a z-axis force against the vane cap forces the first vane cap 2210 into proximate contact with the first endplate 212 to form a seal between the vane cap 2210 and first endplate 212. Referring now to FIG. 23A, it is observed that a cap/endplate gap 2310 could exist between an outer face 2214 of the first vane cap 2210 and the first endplate 212. However, now referring to FIG. 23B, the z-axis force positions the vane cap outer face 2214 of the first vane cap 2210 into proximate contact with the first endplate 212 reducing the cap/endplate gap 2310 to nominally about a zero distance, which provides a seal between the vane cap 2210 and the first endplate 212. While the vane/endplate cap 2210 moves into proximate contact with the housing endplate 212, one or more inner seals 2320, 2330 prevent or minimize movement of fuel from the reference expansion chamber 333 to the leading chamber 334, where the potential fuel leakage follows a path running between the vane body 1610 and first vane cap 2210.
Vane Cap Movement
Still referring to FIG. 23, the means for providing a z-axis force against the vane cap forces the first vane cap 2210 into proximate contact with the first endplate 212 to form a seal, a sealing surface, and/or a restriction of fuel flow between the vane cap 2210 and first endplate 212 is further described. The vane cap z-axis force moves the vane cap 2300 along the z-axis relative to the vane 450. Examples of vane cap z-axis forces include one or more of:

    
    
        a spring force;
        a magnetic force
        a deformable seal force; and
        a fuel force.
    
    


Examples are provided of a vane z-axis spring, magnet, deformable seal, and fuel force.
In a first example, a vane cap z-axis spring force is described. One or more vane cap springs 2340 are affixed to one or both of the vane body 1610 and the first vane cap 2210. In FIG. 23A, two vane cap springs 2340 are illustrated in a compressed configuration. As illustrated in FIG. 23B the springs extend or relax by pushing the first vane cap 2210 into proximate contact with the first endplate 212, which seals the first vane cap 2210 to the first endplate 212 by reducing the cap/endplate gap 2310 to a distance of about zero.
In a second example, a vane cap z-axis magnetic force is described. One or more vane cap magnets 2350 are: affixed to, partially embedded in, and/or are embedded within one or both of the vane body 1610 and first vane cap 2210. In FIG. 23A, two vane cap magnets 2350 are illustrated with like magnetic poles facing each other in a magnetic field resistant position. As illustrated in FIG. 23B the magnets 2350 repel each other to force the first vane cap 2210 into proximate contact with the first endplate 212, thereby reducing the cap/endplate gap 2310 to a gap distance of about zero, which provides a seal between the first vane cap 2210 and first endplate 212.
In a third example, a vane cap z-axis deformable seal force is described. One or more vane cap deformable seals 2330 are affixed to and/or are partially embedded in one or both of the vane body 1610 and the first vane cap 2210. In FIG. 23A, a deformable seal 2330 is illustrated between the vane body 1610 and first vane cap 2210. As illustrated in FIG. 23B the deformable seal 2330 expands toward a natural state to force the first vane cap 2210 into proximate contact with the first endplate 212, thereby reducing the cap/endplate gap 2310 to a gap distance of about zero, which provides a sealing contact surface between the first vane cap 2210 and first endplate 212. An example of a deformable seal is a rope-type material or a compressed packing material type seal. The deformable seal is optionally positioned on an extension 2360 of the vane body 1610 or on an extension of the first vane cap 2210, described infra. Notably, the deformable seal has duel functionality: (1) providing a z-axis force as described herein and (2) providing a seal between the vane body 1610 and first vane cap 2210, described infra.
Each of the spring force, magnetic force, and deformable seal force are stored potential energy sources optionally set to provide a sealing force that seals the vane cap outer face 2214 to the first endplate 212 with a force that is (1) great enough to provide a fuel leakage seal and (2) small enough to allow a wiper seal movement of the vane cap outer face 2214 against the first endplate 212 with rotation of the rotor 440 in the rotary engine 110. The sealing force is further described, infra.
In a fourth example, a vane cap z-axis fuel force is described. As fuel penetrates into a vane body/cap gap 2315, the fuel provides a z-axis fuel force pushing the first vane cap 2210 into proximate contact with the first endplate 212. The cap/endplate gap 2310 and vane body/cap gap 2315 are exaggerated in the provided illustrations to clarify the subject matter. The potential fuel leak path between the first vane cap 2210 and vane body 1610 is blocked by one or more of a first seal 2320, the deformable seal 2330, and a flow-path reduction geometry. An example of a first seal 2320 is an o-ring positioned about either an extension 2360 of the vane body 1610 into the first vane cap 2210, as illustrated, or an extension of the first vane cap 2210 into the vane body 1610, not illustrated. In a first case, the first seal 2320 is affixed to the vane body 1610 and the first seal 2320 remains stationary relative to the vane body 1610 as the first vane cap 2210 moves along the z-axis. Similarly, in a second case the first seal 2320 is affixed to the first vane cap 2210 and the first seal 2320 remains stationary relative to the first vane cap 2210 as the first vane cap 2210 moves along the z-axis. The deformable seal was described, supra. The flow path reduction geometry reduces flow of the fuel between the vane body 1610 and first vane cap 2210 by forcing the fuel through a path having a series of about right angle turns about the above described extension. Fuel flowing through the labyrinth must turn multiple times breaking the flow velocity or momentum of the fuel from the reference expansion chamber 333 to the leading expansion chamber 334. For example, the turns of the labyrinth extend into the vane cap 2210 and/or into the vane body 1610.
Vane Cap Sealing Force
Referring now to FIG. 24A and FIG. 24B, examples of applied sealing forces in a cap 2200 and controlled sealing forces are described using the vane/endplate cap 2300 as an example. Optionally, one or more vane cap bearings 2212 are incorporated into the vane 450 and/or vane cap 2210. Optionally, the vane cap bearing 2212 has a z-axis force applied via a vane body spring 2420 and intermediate vane/cap linkages 2430, which transmit the force of the spring 2420 to the vane cap bearing 2212. Optionally, a rigid support 2440, such as a tube or bearing containment wall, extends from the vane cap outer face 2214 to and preferably into the vane body 1610. The rigid support 2440 transmits the centrifugal force of the vane 450 to the first endplate 212 via the vane cap bearing 2212. Hence, the vane cap bearing 2212, rigid support 2440, and vane body spring 2420 support the majority of the force applied by the vane 450 to the first endplate 212. The vane body spring 2420 preferably applies a greater outward z-axis force to the vane cap bearing 2212 compared to the less forceful outward z-axis forces of one or more of the above described spring force, magnetic force, and/or deformable seal force. For example, the vane body spring 2420 results in a greater coefficient of friction between the vane cap bearing 2212 and end plate 212 compared to a lesser coefficient of friction resulting from the outward z-axis forces of one or more of spring force, magnetic force, and/or deformable seal force. Hence, there exists a first coefficient of friction resultant from the vane body spring 2420, usable to set a load bearing force, such as to the bearing 2212. Additionally, there exists a second coefficient of friction resultant from the spring force, magnetic force, and/or deformable seal force, usable to set a sealing force, such as to a seal. Each of the load bearing force and spring force are independently controlled by their corresponding springs. Further, the reduced contact area of the bearing 2212 with the endplate 212, compared to the potential contact are a of all of outer surface 2214 with the endplate 212, reduces friction between the vane 450 and the endplate 212. Still further, since the greater outward force is supported by the vane cap bearing 2212, rigid support 2440, and vane body spring 2420, the lighter spring force, magnetic force, and/or deformable seal force providing the sealing force to the cap 2200 are adjusted to provide a lesser wiper sealing force sufficient to maintain or about maintain a seal between the first vane cap 2210 and first endplate 212. Referring now to FIG. 24B, the sealing force reduces the cap/endplate gap 2310 to a distance of about zero.
The rigid support 2440 additionally functions as a guide controlling x- and/or y-axis movement of the first vane cap 2210 while allowing z-axis sealing motion of the first vane cap 2210 against the first endplate 212.
Positioning of Vane Caps
FIGS. 22, 23, and 24 illustrated a first vane cap 2210. One or more of the elements of the first vane cap 2210 are applicable to a multitude of caps in various locations in the rotary engine 110. Referring now to FIG. 25, additional vane caps 2300 or seals are illustrated and described.
The vane 450 in FIG. 25 illustrates five optional vane caps, cap seals, or vane extensions: the first vane cap 2210, the second vane cap 2220, a reference chamber vane cap 2510, a leading chamber vane cap 2520, and vane tip cap 2530. The reference chamber vane cap 2510 is a particular type of the lower trailing vane seal 1026, where the reference chamber vane cap 2510 has functionality of sealing movement along the x-axis. Similarly, the leading chamber vane cap 2520 is a particular type of lower trailing seal 1028. Though, not illustrated, the upper trailing seal 1028 and upper leading seal 1029 each are optionally configured as dynamic x-axis vane caps.
One or more vane caps 2300 optionally interconnect to guide and/or restrict movement of another vane cap. For instance, the reference chamber vane cap 2510 and/or the leading chamber vane cap 2520 restrict y-axis movement of the first vane cap 2210.
The vane caps seal potential fuel leak paths. The first vane cap 2210, second vane cap 2220 and the vane tip cap 2530 provide three x-axis seals between the expansion chamber 333 and the leading chamber 334. As described, supra, the first vane cap 2210 provides a first x-axis seal between the expansion chamber 333 and the leading chamber 334. The second vane cap 2220 is optionally and preferably a mirror image of the first vane cap 2210. The second vane cap 2220 contains one or more elements that are as described for the first vane cap 2210, with the second end cap 2220 positioned between the vane body 1610 and the second endplate 214. Like the first end cap 2210, the second end cap 2220 provides another x-axis seal between the reference expansion chamber 333 and the leading chamber 334. Similarly, the vane tip cap 2530 preferably contains one or more elements as described for the first vane cap 2210, only the vane tip cap is located between the vane body 1610 and inner wall 432 of the housing 210. The vane tip cap 2530 provides yet another seal between the expansion chamber 333 and the leading chamber 334. The vane tip cap 2530 optionally contains any of the elements of the vane head 1611. However, the vane tip cap 2530 preferably uses the roller bearings 1740 described in reference to the vane head 1611 in place of the bearings 2212. The roller bearings 1740 aid in guiding rotational movement of the vane about the shaft 220.
The vane 450 optionally and preferably contains four additional seals between the expansion chamber 333 and the rotor-vane slot 452. For example, the reference chamber vane cap 2510 provides a y-axis seal between the reference chamber 333 and the rotor-vane slot 452. Similarly, the leading chamber vane cap 2520 provides a y-axis seal between the leading chamber 334 and the rotor-vane slot 452. Each of the reference chamber vane cap 2510 and leading chamber vane cap 2520 contain one or more elements that correspond with any of the elements described for the first vane cap 2510. The reference and leading chamber vane caps 2510, 2520 preferably contain roller bearings 2522 in place of the bearings 2212. The roller bearings 2522 aid in guiding movement of the vane 450 next to the rotor 440 along the y-axis as the roller bearings have unidirectional ability to rotate. The reference chamber vane cap 2510 and leading chamber vane slot 2520 each provide y-axis seals between an expansion chamber and the rotor-vane slot 452. The upper trailing seal 1028 and upper leading seal 1029 each are optionally configured as dynamic x-axis dynamically moveable vane caps, which also function as y-axis seals, though the upper trailing seal 1028 and upper leading seal 1029 function as seals along the upper end of the rotor-vane slot 452 next to the reference and leading expansion chambers 333, 334, respectively.
Generally, the vane caps 2300 are species of the generic cap 2200. Caps 2200 provide seals between the reference expansion chamber and any of: the leading expansion chamber 334, a trailing expansion chamber, the rotor-vane slot 452, the inner housing 432, and a rotor face. Similarly caps provide seals between the rotor-vane slot 452 and any of: the leading expansion chamber 334, a trailing expansion chamber, and a rotor face.
Rotor Caps
Referring now to FIG. 26, examples of rotor caps 2600 between the first end plate 212 and a face of the rotor 446 are illustrated. Examples of rotor caps 2600 include: a rotor/vane slot cap 2610, a rotor/expansion chamber cap 2620, and an inner rotor cap 2630. Any of the rotor caps 2600 exist on one or both z-axis faces of the rotor 446, such as proximate the first end plate 212 and second end plate 214. The rotor/vane slot cap 2610 is a cap proximate the rotor-vane slot 452 on an endplate face of the rotor 446. The rotor/expansion cap 2620 is a cap proximate the reference expansion chamber 333 on an endplate face of the rotor 446. The inner rotor cap 2630 is a cap proximate the shaft 220 on an endplate face of the rotor 446. Generally, the rotor caps 2600 are caps 2200 that contain any of the elements described in terms of the vane caps 2300. Generally, the rotor caps 2600 seal potential fuel leak paths, such as potential fuel leak paths originating in the reference chamber 333 or rotor-vane slot 452. The inner rotor cap 2630 optionally seals potential fuel leak paths originating in the rotor-vane slot 452 and or in a fuel chamber proximate the shaft 220.
Magnetic/Non-Magnetic Rotary Engine Elements
Optionally, the bearing 2212, roller bearing 1740, and/or roller bearing 2522 are magnetic. Optionally, any of the remaining elements of rotary engine 110 are non-magnetic. Combined, the bearing 2212, roller bearing 1740, rigid support 2440, intermediate vane/cap linkages 2430, and/or vane body spring 2420 provide an electrically conductive pathway between the housing 210 and/or endplates 212, 214 to a conductor proximate the shaft 220.
Lip Seals
In still yet another embodiment, a lip seal 2710 is an optional rotary engine 110 seal sealing boundaries between fuel containing regions and surrounding rotary engine 110 elements. A static seal and/or a dynamic seal seals a gap between two surfaces with minimal force that allows movement of the seal relative to a rotary engine 110 component. For example, a lip seal 2710 seals boundaries between the reference expansion chamber 333 and surrounding rotary engine elements, such as the rotor 440, vane 450, housing 210, and/or first and second end plates 212, 214. Generally, one or more lip seals 2710 are inserted into any dynamic cap 2200 as a secondary seal, where the dynamic cap 2200 functions as a primary seal. However, a lip seal 2710 is optionally affixed or inserted into a rotary engine surface in place of the dynamic cap 2200. For example, a lip seal 2710 is optionally placed in any location previously described for use of a cap seal 2200. Herein, lips seals are first described in detail as affixed to a vane 450 or vane cap. Subsequently, lips seals are described for rotor 440 elements. When the lip seal 2710 moves in the rotary engine 110, the lip seal 2710 functions as a wiper seal.
More particularly, a rotary engine method and apparatus configured with a lip seal 2710 is described. A lip seal 2710 restricts fuel flow from a fuel compartment to a non-fuel compartment and/or fuel flow between fuel compartments, such as between a reference expansion chamber and any of an engine: rotor 440, vane 450, housing 210, and/or a leading expansion chamber 334 or trailing expansion chamber 333. Generally, a lip seal 2710 is a semi-flexible insert, optionally inserted into a vane 450 or dynamic cap 2200, that dynamically flexes in response to fuel flow to seal a boundary, such as sealing a vane 450 or rotor 440 to a rotary engine 110 housing 210 or endplate element 212, 214. The lip seal 2710 provides a seal between a high pressure region, such as in the expansion chamber 333, and a low pressure region, such as the leading chamber 334 past the seven o'clock position in the exhaust phase. Further, lips seals are readily replaced, detachable, and/or are removable.
Referring now to FIG. 27, a vane configured with lip seals 2700 is used as an example in a description of a lip seal 2710. In FIG. 27, vane caps are illustrated with a plurality of optional lip seals 2710, however, the lip seals 2710 are optionally affixed directly to the vane 450 without the use of a cap 2200. As illustrated, lip seals 2710 are incorporated into each of the first vane cap 2210, the second vane cap 2220, the reference chamber vane cap 2510, the leading chamber vane cap 2520, and the vane tip cap 2530. Each lip seal 2710 seals a potential fuel leak path. For example, the lip seals 2710 on the first vane cap 2210, the second vane cap 2220, and the vane tip cap 2530 provide three x-axis seals between the expansion chamber 333 and the leading chamber 334. Lip seals 2710 are also illustrated on each of the reference chamber vane cap 2510 and the leading chamber vane cap 2520, providing seals between an expansion chamber 333, 334 and the rotor-vane slot 452, respectively. Not illustrated are lip seals 2710 corresponding to the upper trailing seal 1028 and upper leading seal 1029.
Lip seals 2710 are compatible with one or more cap 2200 elements. For example, lip seals 2710 are optionally used in conjunction with any of bearings 2212, roller bearings 2522, and any of the means for dynamically moving the cap 2200.
Referring now to FIG. 28, an example of cap configured with seals 2800 is provided. Particularly, the leading chamber vane cap 2520 configured with two lip seals 2710 is provided. The leading chamber vane cap 2520 is configured with one, two, or more channels 2810. The lip seal 2710 inserts into the channel 2810. Preferably, the channel 2810 and lip seal 2710 are configured so that the outer surface of the lip seal 2712 is about flush and/or planar with the outer surface of the leading chamber vane cap 2822. A ring-seal 2720, such as an o-ring, restricts and/or prevents flow of fuel between the lip seal 2710 and the leading chamber vane cap 2520.
Still referring to FIG. 28, as fuel flows between the outer surface of the leading chamber end cap 2822 and housing 210, the fuel engages the lip seal 2710 and deforms a shape of the lip seal. For example, the fuel deforms the shape of the lip seal causing the lip seal to have an increased thickness or cross-sectional area. The increased thickness of the seal forms a seal between the end cap and the housing despite variation in distance between the end cap 2822 and the housing 210. The flexible lip seal 2710 deforms to form a dynamic and/or proximate contact with the housing 210. More particularly, the fuel provides a deforming force that forces and/or pushes an outer edge of the flexible lip seal into the housing 210.
Referring now to FIG. 29, an example of the lip seal 2710 is further illustrated. The flexible lip seal 2710 contains a trailing lip seal edge 2730 facing the reference expansion chamber 333. The lip seal 2710 penetrates into the leading chamber vane cap to a depth 2732, such as along a cut line. Referring now to FIG. 29B, as fuel attempts to flow from the reference expansion chamber 333 between the leading chamber vane cap 2520 and the housing 210, the trailing lip seal edge 2730 deforms to form tighter, better, and/or more effective contact with the housing 210. Similarly, as fuel runs from the leading expansion chamber 334 between the leading chamber vane cap 2520 and the housing 210, the leading lip seal edge 2731 deforms to form tighter contact with the housing 210. Optionally, both the trailing and leading lip seal edges 2730, 2731 are incorporated into a single insert into channel 2810.
In one example, the trailing lip seal edge 2730 is forced toward the housing 210 by fuel pressure in the reference expansion chamber 333 at the same time the leading lip seal edge 2731 is pulled toward the housing 210 by low pressure in the leading chamber 334. Motion of the trailing lip seal edge 2730 is independent of motion of the leading lip seal edge 2731. An example of two lips seals having opposing lip seals is curving in a first orientation of the trailing lip seal edge 2730 toward the housing 210 and the curving in a second opposing orientation of the leading lip seal edge 2731 toward the housing.
Referring now to FIG. 30, lip seals, such as the lip seal 2710 previously described, are optionally placed proximate the rotor face, such as next to the first end plate 212 and/or the second end plate 214. Examples of lip seals on the rotor face include: a rotor/vane lip seal 2714, a rotor/expansion chamber lip seal 2716, and an inner rotor lip seal 2718. The rotor/vane lip seal 2714 is located on the trailing edge of rotor/vane slot 452 and/or on a leading edge of rotor/vane slot, which aids in sealing against fuel flow from the rotor/vane slot 452 to the face of the rotor 440. The rotor/expansion chamber lip seal 2716 aids in sealing against fuel flow from the reference expansion chamber 333 to the face of the rotor 440. The inner rotor lip seal 2718 aids in sealing against fuel flow from the rotor/vane slot 452 to the face of the rotor 440 toward the shaft 220. A first end of the rotor/vane lip seal 2714 optionally terminates within about one, two, three, or more millimeters from a termination of the rotor/expansion chamber lip seal 2716. A second end of the rotor/vane lip seal 2714 optionally terminates within about one, two, three, or more millimeters from the inner rotor lip seal 2718.
Lip seals 2710 are optionally used alone, in pairs, and/or in sets of three or more. Optionally a second lip seal lays parallel to the first lip seal. In a first case of a rotor face lip seal, the second seal provides an additional seal against fuel traversing past the first lip seal. In a second case, referring again to FIG. 29B, the two lip seals seal against fuel flow from two opposite directions, such as fuel from the reference expansion chamber 333 or leading expansion chamber 334 past seals 2730 and 2731 on the leading chamber vane cap 2520, respectively.
Although the invention has been described herein with reference to certain preferred embodiments, one skilled in the art will readily appreciate that other applications may be substituted for those set forth herein without departing from the spirit and scope of the present invention. Accordingly, the invention should only be limited by the Claims included below.

## Claims

1. A method for using a rotary apparatus, comprising the steps of:
providing a housing including an endplate;
providing a rotor positioned within said housing;
providing a vane;
providing a fuel source;
spanning a first distance between said rotor and said housing with said vane;
using at least one of said rotor and said housing to carry said vane, said vane comprising:
a vane body;
a vane cap;
a gap positioned between said vane body and said vane cap; and
a vane seal, said vane seal configured to dynamically vary in cross sectional shape to span a gap distance between said first vane seal and at least one of:
said housing; and
said rotor; and
said vane seal dynamically varying outward to close said gap distance in response to a fuel flow from said fuel source into the gap between said vane body and said vane cap.

2. The method of claim 1, further comprising the steps of:
a rotationally trailing edge of said vane seal deforming radially outward from said vane body due to a first force directed from a rotationally trailing chamber; and
a rotationally leading edge of an additional vane seal deforming radially outward from said vane body due to a second force directed from a rotationally leading chamber, said additional vane seal about planar to said vane seal.

3. The method of claim 1, further comprising the step of:
dynamically separating a vane extension from said vane body by an additional gap distance, said vane extension positioned between said vane body and said vane seal.

4. The method of claim 3, further comprising the step of:
providing a force to aid movement of said vane extension away from said vane body, the force provided by at least one of:
opposing magnets positioned in said vane body and said vane extension, respectively;
a spring positioned between said vane body and said vane extension;
a compressed seal positioned between said vane body and said vane extension; and
a fuel pressure directed into an interface between said vane body and said vane extension.