| 摘要 |
PROBLEM TO BE SOLVED: To improve the efficiency of a compressor by cooling the compressor through the heat exchange between an injection refrigerant and the compressor. SOLUTION: A rotary compressor includes a first suction pipe which is connected to the suction side of a lower stage side compression mechanism unit to lead a low-pressure refrigerant on the injection refrigerating cycle side to the lower stage side compression mechanism unit, an intermediate communication passage for communicating the discharge side of the lower stage side compression mechanism unit with the suction side of a higher stage side compression mechanism unit, a discharge pipe which is connected to a hermetic container to discharge a high-pressure refrigerant discharged inside the hermetic container from the higher stage side compression mechanism unit to the injection refrigerating cycle side, and a second suction pipe for leading the intermediate pressure injection refrigerant which is the wet refrigerant on the injection refrigerating cycle side to the intermediate communication passage. The intermediate communication passage has a means for promoting the heat exchange in which the merged refrigerant of the refrigerant discharged from the lower stage side compression mechanism unit and the intermediate pressure injection refrigerant and the merged refrigerant of the refrigerant discharged from the lower stage side compression mechanism unit in relation to the inside of the hermetic container or the outer surface of the hermetic container absorb the heat. COPYRIGHT: (C)2012,JPO&INPIT
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