To improve operation efficiency of an air conditioner.
This air conditioner comprises a compressor 1, a heat source side heat exchanger 3, a receiver 4, a main decompression device 5, a use side heat exchanger 6, and an injection circuit guiding refrigerant of the receiver 4 to an intermediate pressure chamber or the suction side of the compressor. This system is so set that in cooling, the refrigerant flows in the order of the heat source side heat exchanger 3, the receiver 4, and the main decompression device 5, while in heating, the refrigerant flows in the order of the main decompression device 5, and receiver 4, and the heat source side heat exchanger 3. The receiver 4 is provided with a flow direction control circuit 11 connected thereto via a refrigerant inflow pipe and refrigerant outflow pipe. The flow direction control circuit 11 is so constituted that the refrigerant flowing from the heat source side heat exchanger 3 to the receiver 4 and the refrigerant flowing from the main decompression device to the receiver 4 are made to flow to the receiver via the refrigerant inflow pipe, while the refrigerant flowing from the receiver to the heat source side heat exchanger 3 and the refrigerant flowing from the receiver to the main decompression device 5 are made to flow from the receiver via the refrigerant outflow pipe.
NAKAYAMA SUSUMU
MATSUMURA KENJI
MATSUSHIMA HIROAKI
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