Patent ID: 8579615
Filing Date: 2013-11-12
Classification: F01C

Abstract:
1. A rotary expander, comprising: a housing having a generally cylindrical main chamber, a generally cylindrical rotatable rotor mounted eccentrically with respect to housing main chamber centre; a generally cylindrical rotor liner free to move around the rotor and a single vane assembly comprised of an arched circular portion having a pivot axis fixed to a housing side body and a hinge movably connecting said vane to the rotor liner, the rotary expander further including: a main shaft centre rigidly connected to eccentrically placed rotor, said rotor rotatably and circumferentially housed within cylindrical rotor liner; air or fluidic journal or roller bearings provided between rotor liner and eccentric rotor to reduce rotational friction; a single arc vane element pivotally mounted to the housing side body and periodically extending sealingly from housing slot into said main chamber up to rotor liner to divide the crescent shape volume into two consecutive working chambers, said rotor liner movably hinged to said arc vane link in such a way that outer cylindrical surface of said rotor liner is sealingly tangent to housing working chamber inner peripheral without any frictional contact; a crescent shape a main housing chamber formed by an inner peripheral of housing and an outer surface of the rotor liner being periodically divided into at most two working chambers by the pivoting vane and the common tangency line of two osculating surfaces, namely the rotor liner outer boundary and a housing cylindrical inner peripheral; a plurality of working chambers formed depending on the rotational position of the pivoting vane, each of the said chambers, delimited by an inner cylindrical peripheral surface of an, outer peripheral surface of the rotor liner and the side surface of the hinged arc vane; an inlet port equipped with a rotating valve synchronous with main rotor shaft half speed either mechanically or electrically, regulating the admission time and duration of the entering working fluid within rotary expander and thus preventing the said working fluid to bypass the working chambers and shortcut the inlet and outlet ports of such devices; an inlet port formed in said housing for admitting high pressure and momentum inlet fluid flows into the working chamber delimited by the rotor liner, a housing cylindrical peripheral wall and the arc vane; an inlet nozzle downstream of rotating valve and accelerating fluid up to exit, where after working fluid hits impulse bucket engraved in the rotor liner, wherein a bucket is provided with a leading edge, splitting and diverting fluid by 180° within bucket cavities so as to maximise jet impulse momentum transfer to said rotor liner; a single or a multiple of fluidic cavity or buckets engraved all along the outer surface of the rotor liner together with corresponding single or multiple inlet nozzle to provide additional momentum impulse transfer from working fluid to rotor liner and eccentric rotor and achieve a higher stagnation pressure in working chamber; a working cycle lasting for 360° clockwise rotation of eccentric rotor, wherein a new working cycle under the clockwise rotation of said rotor is initiated every time the tangency line passes by the inlet port, wherein a first working chamber admitting high pressure fluid from inlet port and expansion of the working fluid in said chamber imparts energy to the eccentric rotor under the forcing torque and pressure of admitted fluid, and wherein a working chamber is progressively enlarged to a crescent shape like volume and expanding the admitted high pressure and momentum working fluid through; a second working cycle defined in the consecutive 360° clockwise rotation of said rotor allowing the fully expanded working fluid now in a second working chamber to discharge through exhaust port, wherein the maximum crescent shape volume of the expander main chamber is sized to allow the inlet fluid pressure expansion to desired discharge pressure; a periodic sequence of expanded fluid expulsed from the outlet port with each rotation of the eccentric rotor in response to high pressure and temperature fluid expansion in said expander; provision for geometrical gap between the pivot of the arched vane and end plates adjusted with spacers so that friction contact of the arched vane with housing end plates during said vane reciprocating motion is reduced; retaining rings used on the rotor outer cylindrical surface and on the rotor liner inner circumferential peripheral, wherein said rings operate to eliminate any axial displacement of the rotor liner parallel to main axis, thus reducing friction between rotor liner and end plates; housing cooling holes for steady long operation of the expander and for decrease of the weight of expander unit; rotor liner dynamic balance holes and rotor dynamic balance holes to reduce vibration during operation and to decrease overall weight; and a dynamic balance of the pivoting arc vane with added weight.