Refrigerating cycle device and sealed-type rotary compressor

Abstract

There is provided a pressure switching mechanism that switches one compressor mechanism in a sealed-type rotary compressor between regular compression operation and operation stop in accordance with the magnitude of load, and the pressure switching mechanism is equipped with a branch pipe which includes an open/close valve at the middle thereof and which communicates a high-pressure side of a refrigerating cycle to a second suction pipe, an auxiliary suction pipe connected to the suction pipe end part in an accumulator, a check valve which is mounted on either the auxiliary suction pipe or the suction pipe and checks a reverse flow of refrigerant into the accumulator, and a guide pipe which mounts and holds the suction pipe or the auxiliary pipe to the accumulator.

1 . A refrigerating cycle device, comprising: 
 a sealed-type rotary compressor which houses an electric motor unit and multiple sets of rotary compressor mechanisms connected to the electric motor unit in a sealed casing, which suctions a refrigerant from an accumulator provided outside the sealed casing via suction pipes, respectively, to each of the compressor mechanisms, which compresses the refrigerant at each compressor mechanism, and then, discharges the refrigerant via a space in the sealed casing;    a refrigerating cycle circuit composed of this sealed-type rotary compressor and refrigerating cycle components which are linked to communicate via a refrigerant pipe; and    pressure switching means switching one of the compressor mechanisms in such a manner that low-pressure gas is guided to the compressor mechanism in the sealed-type rotary compressor to allow it to conduct regular compression operation or high-pressure gas is guided thereto to allow it to stop compression operation in accordance with the magnitude of load,    wherein the pressure switching means comprises:    a branch pipe, one end of which is connected to a high pressure side of the refrigerating cycle via an electromagnetic open-close valve and the other end of which is connected to a suction pipe which communicates the accumulator to the other compressor mechanism;    an auxiliary suction pipe connected to an end part protruding to the inside of the accumulator of the suction pipe;    a check valve which is mounted on the auxiliary suction pipe or the suction pipe and which checks reverse flow of refrigerant to the accumulator; and    a guide pipe which mounts and holds the suction pipe or the auxiliary suction pipe to the accumulator.    
   
   
       2 . The refrigerating cycle device according to  claim 1 , 
 wherein the suction pipe includes an end connector unit bulge-forming processed to connect the branch pipe, and an extended tube part to mount the check valve, and the auxiliary suction pipe is integrally linked to the extended tube part.    
   
   
       3 . The refrigerating cycle device according to  claim 1 , 
 wherein the suction pipe has a bent part protruded downward from a connection portion with the compressor mechanism.    
   
   
       4 . The refrigerating cycle device according to  claim 2 , 
 wherein the suction pipe has a bent part protruded downward from a connection portion with the compressor mechanism.    
   
   
       5 . A sealed-type rotary compressor which houses an electric motor unit and multiple sets of rotary compressor mechanisms to be connected to this electric motor unit in a sealed housing, which suctions a refrigerant from an accumulator provided outside the sealed casing via suction pipes, respectively, to each of the compressor mechanisms, and which compresses the refrigerant in each compressor mechanism, and then, discharges the refrigerant via a space in the sealed casing, the compressor comprising pressure switching means having: 
 a branch pipe, one end of which is connected to a high pressure side of the refrigerating cycle via an electromagnetic open-close valve and the other end of which is connected to a suction pipe which communicates the accumulator to the other compressor mechanism;    an auxiliary suction pipe connected to an end part protruding to the inside of the accumulator of the suction pipe;    a check valve which is mounted on the auxiliary suction pipe or the suction pipe and which checks reverse flow of refrigerant to the accumulator; and    a guide pipe which mounts and holds the suction pipe or the auxiliary suction pipe to the accumulator.