| 摘要 |
PURPOSE:To improve the efficiency of a compressor by a method wherein a part of the compression element and refrigerant of the compressor, having an injection cooling circuit and a capacity control unit, is returned into a suction refrigerant and the piping of the capacity control circuit is constituted of double pipings. CONSTITUTION:When the compressor 1 is driven and a piston 13b is rotated, the refrigerant flows from the compressor 1 to an outdoor heat exchanger 7, presure reducing devices 6, 5, an indoor heat exchanger 4 and the compressor 1. The refrigerant flows into the injection cooling circuit 8 from a place between both pressure reducing devices 5, 6 through a capacity control pipe 2a, whose penetrating part is forming the double pipe structure through the pressure reducer 9, and is poured into the compression space A of the cylinder 13a to cool the compressor 1. The high temperature refrigerant, flowing through the capacity control pipe 2a and on the way of being compressed, exchanges the heat thereof with the low temperature refrigerant in the injection cooling circuit 8 in order to mitigate the temperature rise of the suction refrigerant.
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