Patent ID: 9458848
Filing Date: 2016-10-04
CPC Classification: F04C

Claim Text:
1. A hermetic revolving piston rotary compressor, comprising, in combination: a housing defined by a cylindrical main body portion, an upper and a lower cap interposed and fixedly secured to opposite ends of said cylindrical main body portion to form a high pressure side portion of said housing, a base mounting bracket fixedly attached to said lower cap, and a top cylindrical cap whose open end is fixedly secured to a cylindrical projection of said upper cap to form a suction input cavity, said upper cap and said lower cap each having a circular central aperture; a stationary crankshaft, said stationary crankshaft having an eccentric integrally formed therein, an upper end and a lower end, said lower end of said stationary crankshaft being fixedly secured in said circular central aperture of said lower cap and said upper end of said stationary crankshaft being fixedly secured in said circular central aperture of said upper cap to sealingly separate said high pressure side portion from said suction input cavity, said upper end of said stationary crankshaft extending through said circular central aperture of said upper cap into said suction input cavity, said stationary crankshaft having a longitudinal channel opened at a top of said upper end positioned in said suction input cavity; an oil containing sump being disposed in an interior of said high pressure side portion of said housing; a motor having a stator and an external rotor, said stator being permanently fixed to said eccentric of said stationary crankshaft, said external rotor surrounding said stator and comprising a rotor cylinder whose housing inner wall has a plurality of permanent magnets evenly spaced by an air gap from a facing surface of said stator to form a brushless external rotor motor, said rotor cylinder being rotatably mounted on said eccentric of said stationary crankshaft via lower and upper rotor heads each having a central projection equipped with a bearing and a flange portion being circumferentially detachably fixed to opposite ends of said rotor cylinder, whereby a rotor block is formed, said rotor block housing a motor compartment; a revolving piston assembly having a piston cylinder with a coaxial cavity whose diameter is larger than an external diameter of said rotor block, said piston cylinder surrounding said rotor block and fitted eccentrically to the rotor block without radial operating clearance, said piston cylinder being rotatably mounted on said upper and lower ends of said stationary crankshaft via lower and upper piston heads each having a central projection equipped with a bearing and a flange portion being circumferentially detachably fixed axially to opposite ends of said piston cylinder to form said revolving piston assembly which houses said rotor block, thereby forming a compressor type pump; a working cavity defined as a crescent shaped space formed between an external periphery of said rotor block and an internal surface of said revolving piston assembly due to difference in diameter and eccentric positioning of said piston and rotor cylinders; a vane which is formed integrally with said piston cylinder, said vane being projected radially inwardly from a surface of said coaxial cavity of the piston cylinder to partition said working cavity into a suction chamber which is in fluid communication with said motor compartment via a suction port, said suction chamber with said suction port positioned on one side of said vane and a compression chamber communicating through a discharge port of a discharge valve assembly formed in a rim of said piston cylinder, said compression chamber and said discharge valve assembly positioned on opposed sides of said vane which does not slide or swing relative to said revolving piston assembly; a guide bushing which is disposed in a cylindrical aperture extending longitudinally in the wall of said rotor cylinder, said cylindrical aperture having an axis parallel to an axis of said rotor block rotation, said guide bushing supporting said vane in such a manner that when said rotor block is rotated, said revolving piston assembly will be driven simultaneously by the interaction of said vane upon said guide bushing which drives said revolving piston assembly by virtue of its bearing seat in said cylindrical aperture where said guide bushing will oscillate to allow for change in angular position of said vane when said rotor block and said revolving piston assembly are rotated in the same direction: an internal suction system which consists of a low pressure side portion of the housing being in fluid communication through said longitudinal channel in the stationary crankshaft with said motor compartment which, consequently, is in fluid communication with said suction chamber through said suction port; a discharge system comprising said discharge valve assembly with a discharge valve member disposed in a discharge valve cavity formed in the rim of said piston cylinder, said discharge valve cavity providing fluid communication between said compression chamber and a discharge expansion cavity which is circumferentially formed in said rim of said piston cylinder, a valve retainer with a mounting screw, said valve retainer surrounded by said valve member disposed in said discharge valve cavity; a thrust bearing block being securely mounted above said compressor type pump on said upper end of said stationary crankshaft with a thrust seat of said thrust bearing block being biased into engagement with a thrust surface of said bearing fixed in said central projection of said piston upper head to support and limit axial movement of said compressor type pump; an integral oil pump —thrust seat block being securely mounted on said stationary crankshaft's lower end below said compressor type pump with another thrust seat being biased into engagement with a thrust surface of said bearing fixed in the central projection of said piston lower head to support and limit axial movement of said compressor pump, said integral oil pump —thrust seat block having a holder comprising an axial aperture to accommodate said stationary crankshaft's lower end during assembly, a dead end barrel housing an oil pump piston, said barrel formed with an oil input port and oil discharge channel, said integral oil pump —thrust seat block partially submerged in said oil containing sump.