US 2018/0001741 A1 · VEHICLE AIR-CONDITIONING DEVICE

Abstract

There is disclosed a vehicle air-conditioning device in which a heating qualification by gas injection can sufficiently be obtained. The vehicle air-conditioning device comprises a compressor 2 which compresses a refrigerant, an air flow passage 3 through which air to be supplied into a vehicle interior flows, a radiator 4 disposed in the air flow passage to let the refrigerant radiate heat, a heat absorber 9 disposed in the air flow passage to let the refrigerant absorb heat, an outdoor heat exchanger 7 disposed outside the vehicle interior to let the refrigerant radiate or absorb heat, and a controller. The controller executes a heating mode in which the refrigerant discharged from the compressor 2 radiates heat in the radiator 4 and the refrigerant by which heat has been radiated is decompressed and then absorbs heat in the outdoor heat exchanger 7. The vehicle air-conditioning device comprises an injection circuit 40 which distributes a part of the refrigerant flowing out from the radiator 4 to return the refrigerant to the middle of compression by the compressor 2, and the injection circuit 40 has an expansion valve 30, and a discharge side heat exchanger 35 which performs heat exchange between the refrigerant decompressed by the expansion valve 30 and the refrigerant discharged from the compressor 2 before flowing into the radiator 4.

Claims12

Dependent claims

(canceled)

A vehicle air-conditioning device comprising:

a compressor which compresses a refrigerant;
an air flow passage through which air to be supplied into 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,
at least the control means being configured to execute a heating mode in which the refrigerant discharged from the compressor radiates heat in the radiator and the refrigerant by which heat has been radiated is decompressed and then absorbs heat in the outdoor heat exchanger,
the vehicle air-conditioning device comprising:
an injection circuit which distributes a part of the refrigerant flowing out from the radiator to return the refrigerant to the middle of compression by the compressor;
and
a water circulation circuit in which water heated by heating means is circulated by circulating means,
wherein the injection circuit has pressure reducing means, and a water-refrigerant heat exchanger which performs heat exchange between the refrigerant decompressed by the pressure reducing means and the water flowing in the water circulation circuit,
wherein the water circulation circuit has a water-air heat exchanger disposed on an air inflow side of the outdoor heat exchanger or in the air flow passage.

11 more elements

A vehicle air-conditioning device comprising:

a compressor which compresses a refrigerant;
an air flow passage through which air to be supplied into 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,
at least the control means being configured to execute a heating mode in which the refrigerant discharged from the compressor radiates heat in the radiator and the refrigerant by which heat has been radiated is decompressed and then absorbs heat in the outdoor heat exchanger,
the vehicle air-conditioning device comprising an injection circuit which distributes a part of the refrigerant flowing out from the radiator to return the refrigerant to the middle of compression by the compressor,
wherein the control means has frost formation condition estimating means for estimating a frost formation condition to the outdoor heat exchanger, and operates the injection circuit and returns the refrigerant to the middle of compression by the compressor, when frost formation to the outdoor heat exchanger is predicted on the basis of the estimation of the frost formation condition estimating means,
wherein the control means compares a demand heating qualification Qtgt which is a demanded radiator heating qualification with a heating qualification Qhp generated by the radiator, and controls an injection amount by the injection circuit,
and which comprises a water circulation circuit in which water heated by heating means is circulated by circulating means,
wherein the water circulation circuit has a water-air heat exchanger disposed in the air flow passage, and the water circulation circuit is operated when the heating qualification Qhp of the radiator is insufficient.

10 more elements

Dependencies are inferred from the claim text.

Vehicle air-conditioning device

Life of this patent

Vehicle air-conditioning device

Life of this patent

Abstract

Claims12