To control an evaporation refrigerant amount supplied from a vapor injection device to a vapor injection port of a compressor to improve remarkably performance of a refrigerant circuit unit or a heat pump device.
In this heat pump device 22 provided with the first and second heat exchangers 34, 38 connected with a fluid each other, the scroll type compressor 28, and the vapor injection device 32, a flash tank 58 of the vapor injection device has an inlet 60 for a liquid refrigerant from the heat exchangers, a sub-cooled liquid refrigerant outlet 64 to the heat exchangers, and a vaporized refrigerant outlet 62 to a vapor injection port 48 of the scroll type compressor. An expansion valve 86 is provided to open and close the inlet of the flash tank by a float means to regulate a liquid refrigerant amount fed into the tank, so as to control a sub-cooled liquid refrigerant amount in the tank and the evaporation refrigerant amount supplied from the tank to the compressor.
WU MAN WAI
WANG SIMON YIREN
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