| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple heat pump air conditioner that can ensure a normal function of a double pipe heat exchanger circuit and a gas injection circuit in both cooling and heating by operating a bridge circuit reliably. SOLUTION: The multiple heat pump air conditioner 1 has, in rectification piping 43 connected between two connections 42E and 42F of the bridge circuit 40 connected to a liquid refrigerant pipe, a receiver 50, the double pipe heat exchanger circuit 20 for subcooling a refrigerant flowing in the liquid refrigerant pipe 4D or rectification piping 43 through a double pipe heat exchanger 21 with a refrigerant diverted on an outlet side of the receiver 50, and the gas injection circuit 30 for injecting the gas refrigerant past the receiver 50 into an intermediate pressure chamber of a compressor 5. The rectification piping 43 is provided with an electronic expansion valve 51 for controlling the refrigerant flowing in the rectification piping 43 to an intermediate pressure. COPYRIGHT: (C)2008,JPO&INPIT
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