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 inte
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.
대표청구항▼
1. 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 pas
1. 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; andcontrol 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 injection circuit has pressure reducing means, and a discharge side heat exchanger which performs heat exchange between the refrigerant decompressed by the pressure reducing means and the refrigerant discharged from the compressor before flowing into the radiator,wherein the injection circuit further has a radiator outlet side heat exchanger which performs heat exchange between the refrigerant decompressed by the pressure reducing means or another pressure reducing means that is separately disposed and the refrigerant flowing out from the radiator. 2. The vehicle air-conditioning device according to claim 1, wherein the injection circuit further has flow path control means for controlling flow of the refrigerant to the respective heat exchangers in the injection circuit, andthe control means usually evaporates the refrigerant decompressed by the pressure reducing means in the radiator outlet side heat exchanger by the flow path control means, and evaporates the refrigerant in the discharge side heat exchanger or the water-refrigerant heat exchanger and increases a refrigerant flow rate in the injection circuit by the pressure reducing means when the heat radiation of the radiator runs short. 3. The vehicle air-conditioning device according to claim 1, 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 allows the refrigerant to flow through the injection circuit by the pressure reducing means when the heating qualification Qhp is lower than the demand heating qualification Qtgt. 4. The vehicle air-conditioning device according to claim 3, wherein the control means calculates the demand heating qualification Qtgt on the basis of one of indexes indicating a temperature of the air flowing into the radiator, a temperature of the air flowing out from the radiator, and a volume of the air passing the radiator, or any combination of these indexes, and indexes indicating specific heat of the air flowing into the radiator and a density of the air, andthe control means calculates the heating qualification Qhp on the basis of one of indexes indicating an outdoor temperature, the refrigerant flow rate, an air volume in the air flow passage, a velocity, a temperature of the heat absorber, a revolution number of the compressor, a refrigerant pressure of an outlet of the radiator, a refrigerant temperature of the radiator outlet, a refrigerant pressure of an inlet of the radiator, and a refrigerant temperature of the radiator inlet, or any combination of these indexes. 5. The vehicle air-conditioning device according to claim 1, wherein the control means judges an environmental condition in the heating mode on the basis of the environmental condition judged from one of indexes indicating the outdoor temperature, the air volume in the air flow passage, a difference between a target radiator temperature and an actual radiator temperature, a discharge refrigerant temperature of the compressor, and a discharge refrigerant pressure of the compressor, or any combination of these indexes, and when one of the following conditions occurs in the heating mode: the outdoor temperature is a predetermined value or less, the air volume in the air flow passage is a predetermined value or more, the difference between the target radiator temperature and the actual radiator temperature is a predetermined value or more, the discharge refrigerant temperature of the compressor is a predetermined value or more, the discharge refrigerant pressure of the compressor is a predetermined value or more, the control means judges the environmental condition in the heating mode as being worsened and allows the refrigerant to flow through the injection circuit by the pressure reducing means. 6. The vehicle air-conditioning device according to claim 3, wherein the control means controls an amount of the refrigerant to be returned from the injection circuit to the compressor by the pressure reducing means, on the basis of one of a difference between the demand heating qualification Qtgt which is the demanded radiator heating qualification and the heating qualification Qhp generated by the radiator, a difference between the target radiator temperature and a temperature of the radiator, a difference between a target radiator pressure and a pressure of the radiator, and a target outlet temperature to the vehicle interior, or any combination thereof.
Itoh Satoshi,JPX ; Takeo Yuji,JPX ; Takahashi Eiji,JPX ; Iritani Kunio,JPX, Vehicle air conditioning system with expansion valve control during high pressure cycle conditions.
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