VEHICULAR AIR CONDITIONER

摘要

There is disclosed a vehicular air conditioner in which in a dehumidifying and cooling mode, a heating capability of a radiator can be acquired without increasing a flow rate of a refrigerant into a heat absorber. The dehumidifying and cooling mode is executed to let the refrigerant discharged from a compressor 2 radiate heat in a radiator 4 and an outdoor heat exchanger 7, decompress the refrigerant by which heat has been radiated and then let the refrigerant absorb heat in a heat absorber 9. The vehicular air conditioner includes an injection circuit 40 which distributes a part of the refrigerant flowing out from the radiator 4 to return the part of the refrigerant to the compressor 2, and in the dehumidifying and cooling mode, the injection circuit 40 is operated to return the refrigerant to the compressor 2, in a case where there is established predetermined radiator capability shortage condition on which a heating capability of the radiator 4 runs short and/or predetermined low outdoor air temperature startup condition on which startup is performed at a low outdoor air temperature.

主权项

1. A vehicular air conditioner comprising:
a compressor which compresses a refrigerant; a radiator which lets the refrigerant radiate heat to heat air to be supplied to a vehicle interior; a heat absorber which lets the refrigerant absorb heat to cool the air to be supplied to the vehicle interior; an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant radiate heat; and control means, the vehicular air conditioner executing a dehumidifying and cooling mode in which the control means lets the refrigerant discharged from the compressor radiate heat in the radiator and the outdoor heat exchanger or only in the radiator, decompresses the refrigerant by which heat has been radiated and then lets the refrigerant absorb heat in the heat absorber, the vehicular air conditioner comprising: an injection circuit which distributes a part of the refrigerant flowing out from the radiator to return the part of the refrigerant to the compressor, wherein in the dehumidifying and cooling mode, the control means operates the injection circuit to return the refrigerant to the compressor, when there is established predetermined radiator capability shortage condition on which a heating capability of the radiator runs short and/or predetermined low outdoor air temperature startup condition on which startup is performed at a low outdoor air temperature.