AIR CONDITIONING DEVICE FOR VEHICLE

摘要

There is disclosed an air conditioning device for vehicle in which in a defrosting mode to defrost an outdoor heat exchanger, the defrosting of the outdoor heat exchanger can be achieved without hindrance while maintaining heating of a vehicle interior. A refrigerant discharged from a compressor 2 radiates heat in a radiator 4 and the refrigerant by which heat has been radiated is decompressed and then absorbs heat in an outdoor heat exchanger 7 to heat the vehicle interior. The air conditioning device for vehicle includes an injection circuit 40 which distributes a part of the refrigerant flowing out from the radiator 4 to return the part to the compressor 2. When a controller 32 passes the high-temperature refrigerant through the outdoor heat exchanger 7 to perform defrosting, the controller operates the injection circuit 40 to return the refrigerant to the compressor 2.

主权项

1. An air conditioning device for vehicle comprising:
a compressor which compresses a refrigerant; an air flow passage through which air to be supplied to a vehicle interior flows; a radiator disposed in the air flow passage to let the refrigerant radiate heat; a heat absorber disposed in the air flow passage to let the refrigerant absorb heat; an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant radiate or absorb heat; and control means, the control means being configured to let the refrigerant discharged from the compressor radiate heat in the radiator, decompress the refrigerant by which heat has been radiated and then let the refrigerant absorb heat in the outdoor heat exchanger, thereby heating the vehicle interior, the air conditioning device for vehicle 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 the control means operates the injection circuit to return the refrigerant to the compressor, when the high-temperature refrigerant is passed through the outdoor heat exchanger to perform defrosting.