Multi-stage rotary compressor

摘要

A multi-stage compression type rotary compressor (10)
characterized in that the rotary compressor (10) comprises:
a sealed vessel (12);
an electrical-power element (14) having a rotary shaft (16); and
a first rotary compression element (32) and
a second rotary compression element (34) driven by the rotary shaft (16) of the electrical-power element (14),
wherein a refrigerant compressed by the first rotary compression element (32) is compressed by the second rotary compression element (34), and
wherein the refrigerant comprises a combustible refrigerant, and the refrigerant compressed by the first rotary compression element (32) is discharged into the sealed vessel (12), and the discharged refrigerant is under a medium pressure and is further compressed by the second rotary compression element (34) and wherein the discharged medium pressure refrigerant is compressed by the second rotary compression element (34), and a discharge side of the refrigerant in the second rotary compression element (34) communicates with the first and second back pressure chambers (82,80).