Rotary compressor and refrigeration apparatus

Abstract

A rotary compressor includes a compression mechanism configured to compress a refrigerant, a drive shaft configured to drive the compression mechanism, a motor configured to rotate the drive shaft, a support member disposed between the compression mechanism and the motor, and a balance weight provided for the drive shaft. The support member rotatably supports the drive shaft. The balance weigh is disposed between the compression mechanism and the motor. The support member includes a first support portion that supports the drive shaft on a side closer to the compression mechanism than the balance weight, and a second support portion that supports the drive shaft on a side closer to the motor than the balance weight.

1 . A rotary compressor comprising:
 a compression mechanism configured to compress a refrigerant;   a drive shaft configured to drive the compression mechanism; and   a motor configured to rotate the drive shaft;   a support member disposed between the compression mechanism and the motor, the support member rotatably supporting the drive shaft; and   a balance weight provided for the drive shaft, the balance weigh being disposed between the compression mechanism and the motor,   the support member including
 a first support portion that supports the drive shaft on a side closer to the compression mechanism than the balance weight, and 
 a second support portion that supports the drive shaft on a side closer to the motor than the balance weight. 
   
     
     
         2 . The rotary compressor of  claim 1 , wherein
 an axial length of a portion of the drive shaft supported by the first support portion is L 1 ,   an axial length of a portion of the drive shaft supported by the second support portion is L 2 , and   L 1 ≥L 2 .   
     
     
         3 . The rotary compressor of  claim 1 , further comprising:
 a first bearing provided at the first support portion, the first bearing supporting the drive shaft; and   a second bearing provided at the second support portion, the second bearing supporting the drive shaft.   
     
     
         4 . The rotary compressor of  claim 1 , further comprising:
 a casing that houses the compression mechanism,   the support member including
 a first housing body including the first support portion, the first housing body being fixed to the casing, and 
 a second housing body including the second support portion, the second housing body being fixed to the first housing body. 
   
     
     
         5 . A refrigeration apparatus including the rotary compressor of  claim 1 , the refrigeration apparatus further comprising:
 a refrigerant circuit through which a refrigerant compressed by the rotary compressor flows.