| 摘要 |
An outdoor heat exchanger ( 23 ), an indoor heat exchanger ( 24 ), a compression/expansion unit ( 30 ), and other circuit components are connected in a refrigerant circuit ( 20 ). The compression/expansion unit ( 30 ) includes a compression mechanism ( 50 ), an electric motor ( 45 ), and an expansion mechanism ( 60 ). In addition, the refrigerant circuit ( 20 ) has an injection pipeline ( 26 ). When an injection valve ( 27 ) is opened, a portion of high pressure refrigerant after heat dissipation flows into the injection pipeline ( 26 ) and is introduced into an expansion chamber ( 66 ) of the expansion mechanism ( 60 ) in the process of expansion. In the expansion mechanism ( 60 ), power is recovered from both high pressure refrigerant introduced into the expansion chamber ( 66 ) from an inflow port ( 34 ) and high pressure refrigerant introduced into the expansion chamber ( 66 ) from the injection pipeline ( 26 ).
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