Rolling piston compressor
AssigneesNippondenso Co., Ltd., Nippon Soken, Inc.
InventorsMikio Matsuda, Mitsuo Inagaki, Hiroshi Ogawa, Hideaki Sasaya
Life of this patent
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Abstract
A rolling piston type compressor of a simplified design having a single rolling piston, capable of reducing a variation in torque. The compressor has a housing in which a rolling piston 42 is arranged so that an orbital movement of the rolling piston is obtained about the axis of a crankshaft 5, so that a first operating chamber 40 is formed between the rolling piston 42 and the housing. A cylindrical pillar 47 which is stationary is arranged in the rolling piston, so that a second operating chamber is formed between the rolling piston and the pillar. The medium compressed in the first operating chamber is introduced into the second operating chamber for obtaining two step compression.
Claims24
A rolling piston type compressor, comprising:
- (a) a housing defining a circular cylinder bore defining an inner cylindrical surface;
- (b) a shaft having an axis of elongation rotatably supported by said housing, said shaft having a crank member which is eccentric with respect to the axis of the shaft;
- (c) a circular cylindrical pillar which is fixed to the housing and which has an axis of elongation which coincides with the axis of the shaft, said pillar forming an outer cylindrical surface;
- (d) a rolling piston of a circular tubular shape having an axis of elongation, the rolling piston being connected rotatably to the crank member of the shaft so that an orbital movement of the rolling piston is obtained about the axis of the shaft, said rolling piston having an inner and outer circular cylindrical surfaces, which, during said orbital movement of the rolling piston, stay in contact, respectively, with said outer cylindrical surface of the pillar and said inner cylindrical surface of the housing, so that first and second operating chambers are created between the rolling piston and the housing and between the rolling piston and the pillar, respectively, a value of a volume ratio between said first and second operating chambers being in a range between about 0.4 to about 0.6;
- (e) first vane means for dividing the first chamber into first and second sections so that, upon the orbital movement of the rolling piston, the volume of the first section of the first chamber increases while the volume of the second section of the first chamber decreases;
- (f) second vane means for dividing the second chamber into first and second sections, so that, upon the orbital movement of the rolling piston, the volume of the first section of the second chamber increases while the volume of the second section of the second chamber decreases, said first and second vane means being arranged in such a relationship that a timing of a commencement of a compression process is different by a value of about 180 degrees between said first and second operating chambers;
- (g) an intake port opened to a first section of one of the first and second chambers for introducing a medium to be compressed thereinto;
- (h) an intermediate pressure chamber for connecting the second section of said one chamber with the first section of the other chamber for receiving the medium as compressed at the one chamber, and;
- (i) an outlet pressure chamber connected to the second section of the other chamber for receiving the medium compressed at the other chamber.
Dependencies are inferred from the claim text.