Rotary compressor and refrigeration cycle apparatus

Abstract

A rotary compressor is provided that can prevent decrease in reliability of a multi-stage compression mechanism unit and can be downsized. A compression mechanism unit of a compressor includes: a low-pressure side cylinder having a low-pressure side compression chamber that compresses introduced gaseous refrigerant and discharges the compressed refrigerant gas by power of a low-pressure side eccentric portion; a high-pressure side cylinder having a high-pressure side compression chamber that compresses the refrigerant discharged from the low-pressure side compression chamber by power of a high-pressure side eccentric portion; and a partition plate provided between the low-pressure side cylinder and the high-pressure side cylinder, wherein a height of the low-pressure side compression chamber is the same as a height of the high-pressure side compression chamber, and an inner diameter dimension of the low-pressure side compression chamber is larger than an inner diameter dimension of the high-pressure side compression chamber.

1 . A rotary compressor comprising:
 a sealed container including a central axis extending in an up-down direction;   an electric motor unit provided within the sealed container;   a crankshaft, including a low-pressure side eccentric portion and a high-pressure side eccentric portion, configured to be rotationally driven around the central axis by the electric motor unit, the low-pressure side eccentric portion being eccentric from the central axis of the sealed container by a first eccentric length, the high-pressure side eccentric portion being provided below the low-pressure side eccentric portion and being eccentric from the central axis by a second eccentric length; and   a compression mechanism unit including a low-pressure side cylinder, a high-pressure side cylinder, and a partition plate provided between the low-pressure side cylinder and the high-pressure side cylinder, the low-pressure side cylinder including a low-pressure side compression chamber configured to compress introduced gaseous refrigerant and discharge the compressed refrigerant gas by power of the low-pressure side eccentric portion, the high-pressure side cylinder including a high-pressure side compression chamber that configured to compress the refrigerant discharged from the low-pressure side compression chamber by power of the high-pressure side eccentric portion, wherein   a height of the low-pressure side compression chamber is a same as a height of the high-pressure side compression chamber, and   an inner diameter dimension of the low-pressure side compression chamber is larger than an inner diameter dimension of the high-pressure side compression chamber.   
     
     
         2 . The rotary compressor according to  claim 1 , wherein the first eccentric length is larger than the second eccentric length. 
     
     
         3 . The rotary compressor according to  claim 1 , wherein a compression start angle of the high-pressure side compression chamber is larger than a compression start angle of the low-pressure side compression chamber. 
     
     
         4 . The rotary compressor according to  claim 1 , wherein the high-pressure side cylinder includes a groove, the groove being provided on a wall surface defining the high-pressure side compression chamber, the groove being connected to a suction portion of the high-pressure side compression chamber. 
     
     
         5 . The rotary compressor according to  claim 1 , wherein
 the partition plate and the high-pressure side cylinder include a medium-pressure flow path, and   the medium-pressure flow path connects a discharge portion of the low-pressure side compression chamber and a suction portion of the high-pressure side compression chamber.   
     
     
         6 . The rotary compressor according to  claim 5 , wherein
 the partition plate includes a first partition plate half body and a second partition plate half body stacked below the first partition plate half body, and part of the medium-pressure flow path is provided on a mating surface of the first partition plate half body and the second partition plate half body, and   the second partition plate half body has a larger thickness than the first partition plate half body, the second partition plate half body including a lower part of the part of the medium-pressure flow path, the first partition plate half body including an upper part of the part of the medium-pressure flow path.   
     
     
         7 . The rotary compressor according to  claim 5 , further comprising an intermediate pipe provided outside the sealed container,
 wherein the medium-pressure flow path is connected to a suction portion of the high-pressure side compression chamber via the intermediate pipe.   
     
     
         8 . A refrigeration cycle apparatus comprising:
 a rotary compressor according to  claim 1 ;   a heat radiator;   an expansion device;   a heat absorber; and   a refrigerant pipe that connects the rotary compressor, the heat radiator, the expansion device, and the heat absorber, and is configured to allow the refrigerant to circulate.   
     
     
         9 . The rotary compressor according to  claim 2 , wherein a compression start angle of the high-pressure side compression chamber is larger than a compression start angle of the low-pressure side compression chamber. 
     
     
         10 . The rotary compressor according to  claim 2 , wherein the high-pressure side cylinder includes a groove, the groove being provided on a wall surface defining the high-pressure side compression chamber, the groove being connected to a suction portion of the high-pressure side compression chamber. 
     
     
         11 . The rotary compressor according to  claim 3 , wherein the high-pressure side cylinder includes a groove, the groove being provided on a wall surface defining the high-pressure side compression chamber, the groove being connected to a suction portion of the high-pressure side compression chamber. 
     
     
         12 . The rotary compressor according to  claim 2 , wherein
 the partition plate and the high-pressure side cylinder include a medium-pressure flow path, and   the medium-pressure flow path connects a discharge portion of the low-pressure side compression chamber and a suction portion of the high-pressure side compression chamber.   
     
     
         13 . The rotary compressor according to  claim 3 , wherein
 the partition plate and the high-pressure side cylinder include a medium-pressure flow path, and   the medium-pressure flow path connects a discharge portion of the low-pressure side compression chamber and a suction portion of the high-pressure side compression chamber.   
     
     
         14 . The rotary compressor according to  claim 4 , wherein
 the partition plate and the high-pressure side cylinder include a medium-pressure flow path, and   the medium-pressure flow path connects a discharge portion of the low-pressure side compression chamber and a suction portion of the high-pressure side compression chamber.   
     
     
         15 . The rotary compressor according to  claim 6 , further comprising an intermediate pipe provided outside the sealed container,
 wherein the medium-pressure flow path is connected to a suction portion of the high-pressure side compression chamber via the intermediate pipe.   
     
     
         16 . A refrigeration cycle apparatus comprising:
 a rotary compressor according to  claim 2 ;   a heat radiator;   an expansion device;   a heat absorber; and   a refrigerant pipe that connects the rotary compressor, the heat radiator, the expansion device, and the heat absorber, and is configured to allow the refrigerant to circulate.   
     
     
         17 . A refrigeration cycle apparatus comprising:
 a rotary compressor according to  claim 3 ;   a heat radiator;   an expansion device;   a heat absorber; and   a refrigerant pipe that connects the rotary compressor, the heat radiator, the expansion device, and the heat absorber, and is configured to allow the refrigerant to circulate.   
     
     
         18 . A refrigeration cycle apparatus comprising:
 a rotary compressor according to  claim 4 ;   a heat radiator;   an expansion device;   a heat absorber; and   a refrigerant pipe that connects the rotary compressor, the heat radiator, the expansion device, and the heat absorber, and is configured to allow the refrigerant to circulate.   
     
     
         19 . A refrigeration cycle apparatus comprising:
 a rotary compressor according to  claim 5 ;   a heat radiator;   an expansion device;   a heat absorber; and   a refrigerant pipe that connects the rotary compressor, the heat radiator, the expansion device, and the heat absorber, and is configured to allow the refrigerant to circulate.   
     
     
         20 . A refrigeration cycle apparatus comprising:
 a rotary compressor according to  claim 6 ;   a heat radiator;   an expansion device;   a heat absorber; and   a refrigerant pipe that connects the rotary compressor, the heat radiator, the expansion device, and the heat absorber, and is configured to allow the refrigerant to circulate.