Rotary compressor and heat pump system

Abstract

There is provided a rotary compressor in which the pressure loss in a refrigerant suction pipe connecting the compressor and an accumulator to each other is reduced, and the compression efficiency is increased. The inside diameter D 2 of a refrigerant suction pipe 64 on the outlet side of the accumulator 6 is made larger than the inside diameter D 1 of a refrigerant return pipe 62 on the inlet side thereof (D 2 >D 1 ).

1 . A rotary compressor comprising a compressor body including a motor and a rotary compressing section in a closed shell, and an accumulator at the side of the compressor body, in which a refrigerant return pipe connected to a refrigerating cycle is connected to the upper part of the accumulator, and a refrigerant suction pipe connected to the compressing section is connected to the lower part of the accumulator, wherein
 when the inside diameter of the refrigerant return pipe is taken as D 1 , and the inside diameter of the refrigerant suction pipe is taken as D 2 , D 2  is larger than D 1 .   
   
   
       2 . The rotary compressor according to  claim 1 , wherein the refrigerant suction pipe is arranged so as to be offset in the direction such as to be separated from the compressor body with respect to the center axis of the accumulator. 
   
   
       3 . The rotary compressor according to  claim 1 , wherein the rotational speed of the compressing section is variable. 
   
   
       4 . The rotary compressor according to  claim 1 , wherein the rotary compressing section is provided with a low-stage compressing section and a high-stage compressing section, and a means for allowing the discharge side of the low-stage compressing section and the suction side of the high-stage compressing section to communicate with each other is provided, whereby a two-stage compressing section is formed. 
   
   
       5 . A heat pump system having a refrigerating cycle including a compressor, a condenser, an expansion mechanism, and an evaporator and comprising a low-pressure refrigerant pipe for connecting an accumulator for the compressor to the evaporator, wherein
 the compressor described in  claim 1  is used as the compressor, and taking the inside diameter of the low-pressure refrigerant pipe as D 0 , D 2  is larger than D 0 .