An in-vehicle interior heating device, an indirect heat pump air conditioner for an electric vehicle, and an automobile

Abstract

The present invention provides an in-vehicle interior heating device, an indirect heat pump air conditioner for an electric vehicle, and an automobile, including a three-way valve, a first throttle valve, an in-vehicle evaporator, a second throttle valve, and a one-way check valve that are connected in sequence; the three-way valve is configured to restrict the refrigerant from flowing into the first throttle valve, the in-vehicle evaporator, and the second throttle valve in sequence when heating by the in-vehicle interior cooling device is required; the first throttle valve is configured to throttle the flowing refrigerant and release the heat of the refrigerant during the throttling process; the in-vehicle evaporator is configured to cool the flowing refrigerant and release heat during the cooling process; the second throttle valve is configured to throttle the flowing refrigerant and convert the flowing refrigerant into a two-phase refrigerant, and release heat during the throttling process. The present invention uses the in-vehicle evaporator as a secondary in-vehicle condenser to improve the heating energy efficiency of the heat pump system; reduce the power consumption of the air conditioner, and improve the cruising range of the electric vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and particularly to an in-vehicle indoor heating device, an indirect heat pump air conditioner for electric vehicles, and an automobile. Background Art

[0002] Since electric vehicles lack an internal combustion engine, the heating demand of the vehicle air conditioner in winter is one of the reasons for the reduction of the cruising range of electric vehicles. Heat pump technology seems to be one of the excellent solutions to improve the winter cruising range of electric vehicles. There are basically two routes for heat pump air conditioners: indirect heat pumps and direct heat pumps. Both have their respective advantages and disadvantages. Among them, the disadvantage of the indirect heat pump compared to the direct heat pump is low heating energy efficiency.

[0003] Currently, automotive heat pump air conditioning technology is basically divided into two routes: air PTC (Positive Temperature Coefficient) + direct heat pump or water PTC + indirect heat pump. Among them, the direct heat pump uses high-temperature and high-pressure refrigerant to directly heat the passenger compartment; the indirect heat pump uses high-temperature and high-pressure refrigerant to heat the coolant, and then the coolant circulation circuit transports the heat to the passenger compartment to achieve in-vehicle heating. Each of the two heat pump technology routes has its own advantages and disadvantages. The indirect heat pump has the following deficiencies: under the same heating conditions, the heating performance of the indirect heat pump is worse than that of the direct heat pump by about 15%.

[0004] As Figure 1 shown, is a typical heat pump air conditioner for electric vehicles, specifically including: a refrigerant circulation circuit, an air-side circulation, and a coolant circulation circuit. This system can achieve heating and cooling functions in multiple modes, for example, refrigeration, battery cooling, dehumidification, heating and dehumidification, motor waste heat recovery, defrosting and demisting, and defrosting.

[0005] The refrigerant circuit includes: 1. Electric compressor; 2. Water-cooled condenser; 3. Electronic expansion valve 1; 5. Outdoor heat exchanger; 6. Cooling fan; 7. Electronic expansion valve 2; 8. Chiller (water chiller); 9. Two-way valve; 10. Electronic expansion valve 3; 4. HVAC (Heating, Ventilation and Air Conditioning); 11. Evaporator; 12. Gas-liquid separator; temperature and pressure sensor; the coolant circulation circuit includes: 15. Heater core; 13. Water pump; 2. Water-cooled condenser; 14. Water PTC; air-side heating circulation: the air inside the vehicle enters from the HVAC return air duct, passes through the evaporator and the heater core, and finally blows out from the air outlet. The disadvantages of this typical heat pump air conditioner are also relatively obvious, such as low heating performance, and although the energy consumption is higher than that of the water PTC, it is worse than that of the direct heat pump in terms of performance. Summary of the Invention

[0006] The object of the present invention is to provide an in-vehicle interior heating device, an indirect heat pump air conditioner for electric vehicles, and an automobile, so as to solve the technical problems of low heating performance and high energy consumption of existing heat pump air conditioners.

[0007] On the one hand, an indirect heat pump air conditioner for electric vehicles is provided for heating of the indirect heat pump air conditioner for electric vehicles, including: a three-way valve, a first throttle valve, an indoor evaporator, a second throttle valve, and a one-way check valve connected in sequence;

[0008] The three-way valve is used to restrict the refrigerant from flowing into the first throttle valve, the indoor evaporator, and the second throttle valve in sequence when the in-vehicle interior cooling device needs to be heated;

[0009] The first throttle valve is used to throttle the flowing refrigerant and release the heat of the refrigerant during the throttling process;

[0010] The indoor evaporator is used to cool the flowing refrigerant and release heat during the cooling process;

[0011] The second throttle valve is used to throttle the flowing refrigerant and convert the flowing refrigerant into a two-phase refrigerant, and release heat during the throttling process;

[0012] The one-way check valve is used to restrict the flow direction of the refrigerant.

[0013] Preferably, the input end of the three-way valve is connected to the output end of the water-cooled condenser for introducing the refrigerant flowing through the water-cooled condenser into the first throttle valve; one output end of the three-way valve is connected to the input end of the first throttle valve; the other output end of the three-way valve is respectively connected to the output end of the second throttle valve and the input end of other in-vehicle heating devices for restricting the refrigerant output by the second throttle valve from flowing into other in-vehicle heating devices.

[0014] Preferably, the input end of the indoor evaporator is connected to the output end of the first throttle valve, and the output end of the indoor evaporator is respectively connected to the input end of the second throttle valve and the one-way check valve.

[0015] On the other hand, an indirect heat pump air conditioner for electric vehicles is further provided, including: the in-vehicle interior heating device, the in-vehicle exterior heating device, a compressor, a coolant circulation device, and an HVAC; the output end of the compressor is connected to the input end of the in-vehicle interior heating device, the output end of the in-vehicle interior heating device is connected to the input end of the in-vehicle exterior heating device, and the output end of the in-vehicle exterior heating device is connected to the input end of the compressor; the HVAC is respectively connected to the in-vehicle interior heating device, the in-vehicle exterior heating device, and the coolant circulation device;

[0016] The on-vehicle outdoor heating device is used to convert the two-phase refrigerant output by the on-vehicle indoor heating device into a gaseous refrigerant by absorbing the heat of outdoor air, and transmit the gaseous refrigerant back to the compressor;

[0017] The compressor is used to drive the refrigerant in the on-vehicle indoor heating device and the on-vehicle outdoor heating device to circulate;

[0018] The HVAC is used to conduct the heat released by the on-vehicle indoor heating device, the on-vehicle outdoor heating device, and the coolant circulation device to the interior of the vehicle for heating;

[0019] The coolant circulation device is used to cool the flowing refrigerant and conduct the heat released during the cooling process to the HVAC.

[0020] Preferably, the on-vehicle outdoor heating device includes: a first electronic expansion valve, an outdoor heat exchanger, a cooling fan, a second electronic expansion valve, a chiller, a two-way valve, a third electronic expansion valve, and a gas-liquid separator; the input end of the first electronic expansion valve is respectively connected to the output end of the three-way valve and the output end of the second throttle valve, the output end of the first electronic expansion valve is connected to the input end of the outdoor heat exchanger, the cooling fan is arranged on the outdoor heat exchanger, the output end of the outdoor heat exchanger is respectively connected to the second electronic expansion valve, the two-way valve, and the third electronic expansion valve, the other end of the second electronic expansion valve is connected to the chiller, the other end of the two-way valve and the other end of the chiller are respectively connected to the gas-liquid separator, and the other end of the gas-liquid separator is connected to the compressor; the other end of the third electronic expansion valve is respectively connected to the output end of the first throttle valve and the input end of the indoor evaporator, and is used to limit the refrigerant flowing through the third electronic expansion valve or the first throttle valve from flowing into the indoor evaporator.

[0021] Preferably, the input end of the three-way valve is connected to the output end of the water-cooled condenser, and is used to introduce the refrigerant flowing through the water-cooled condenser into the first throttle valve; one output end of the three-way valve is connected to the input end of the first throttle valve; the other output end of the three-way valve is respectively connected to the output end of the second throttle valve and the input end of the first electronic expansion valve, and is used to limit the refrigerant output by the second throttle valve from flowing into the first electronic expansion valve.

[0022] Preferably, the input end of the indoor evaporator is respectively connected to the output end of the first throttle valve and the output end of the third electronic expansion valve, the output end of the indoor evaporator is connected to the input end of the second throttle valve and the one-way check valve; the other end of the one-way check valve is connected to the gas-liquid separator.

[0023] Preferably, the coolant circulation device includes: a water-cooled condenser, an electric water pump, a PTC, and a heater core; the refrigerant input by the compressor passes through the water-cooled condenser and is input into the three-way valve, one end of the water-cooled condenser is sequentially connected to the PTC, the heater core, and the electric water pump, and the output end of the electric water pump is connected to the other end of the water-cooled condenser.

[0024] Preferably, the HVAC is provided with a return air outlet, an air outlet, and an air duct connecting the return air outlet and the air outlet; the air duct passes through the indoor evaporator and the heater core, and is used to guide the air entering from the return air outlet to pass through the indoor evaporator and the heater core, and introduce the heat released by the indoor evaporator and the heater core into the vehicle interior from the air outlet.

[0025] On the other hand, a vehicle is also provided, including: the indirect heat pump air conditioner for electric vehicles as described above.

[0026] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0027] The on-vehicle indoor heating device, the indirect heat pump air conditioner for electric vehicles, and the vehicle provided by the present invention utilize the vehicle interior evaporator as a secondary indoor condenser in a typical indirect heat pump architecture of an automotive air conditioner, and it is expected that the heat pump operating condition can save 12% of the air conditioner energy consumption, improve the heating energy efficiency of the heat pump system; increase the system COP value, reduce the air conditioner power consumption, and increase the driving range of the electric vehicle. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present invention.

[0029] Figure 1 It is a schematic diagram of a typical electric vehicle heat pump air conditioner in the background art.

[0030] Figure 2 It is a schematic diagram of an on-vehicle indoor heating device in an embodiment of the present invention.

[0031] Figure 3 It is a schematic diagram of an indirect heat pump air conditioner for electric vehicles in an embodiment of the present invention. Detailed Embodiments

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings.

[0033] As shown Figure 2 in the figure, it is a schematic diagram of an embodiment of an in-vehicle interior heating device provided by the present invention. In this embodiment, the device is used for heating an indirect heat pump air conditioner of an electric vehicle, and includes: a three-way valve 16, a first throttle valve 18, an indoor evaporator 11, a second throttle valve 19, and a one-way check valve 17, which are connected in sequence;

[0034] The three-way valve 16 is used to restrict the refrigerant from flowing into the first throttle valve 18, the indoor evaporator 11, and the second throttle valve 19 in sequence when heating by the in-vehicle interior cooling device is required; specifically, the input end of the three-way valve 16 is connected to the output end of the water-cooled condenser 2 for guiding the refrigerant flowing through the water-cooled condenser 2 into the first throttle valve 18; one output end of the three-way valve 16 is connected to the input end of the first throttle valve 18; the other output end of the three-way valve 16 is respectively connected to the output end of the second throttle valve 19 and the input end of other in-vehicle heating devices for restricting the refrigerant output by the second throttle valve 19 from flowing into other in-vehicle heating devices; it can be understood that the high-temperature and high-pressure refrigerant at the outlet of the compressor 1 passes through the water-cooled condenser 2 and then flows into the input port of the three-way valve 16 and flows into the first throttle valve 18 from the direction of the b valve of the three-way valve 16.

[0035] The first throttle valve 18 is used to throttle the flowing refrigerant and release the heat of the refrigerant during the throttling process; specifically, the high-temperature and high-pressure refrigerant passes through the first throttle valve 18 and is converted into a lower-temperature and lower-pressure refrigerant under the throttling action and then flows into the indoor evaporator 11.

[0036] The indoor evaporator 11 is used to cool the flowing refrigerant and release heat during the cooling process; specifically, the input end of the indoor evaporator 11 is connected to the output end of the first throttle valve 18, and the output end of the indoor evaporator 11 is respectively connected to the input end of the second throttle valve 19 and the one-way check valve 17; it can be understood that the refrigerant is cooled twice in the indoor evaporator 11 into a low-temperature subcooled refrigerant; the low-temperature subcooled refrigerant continues to pass through the one-way check valve 17 and the second throttle valve 19.

[0037] The second throttle valve 19 is used to throttle the flowing refrigerant and convert the flowing refrigerant into a two-phase refrigerant, and release heat during the throttling process; specifically, the low-temperature subcooled refrigerant is changed into a low-temperature and low-pressure two-phase refrigerant under the throttling action and input into the first electronic expansion valve 3.

[0038] The one-way check valve 17 is used to restrict the flow direction of the refrigerant, specifically, to restrict the refrigerant from flowing from the indoor evaporator 11 to the gas-liquid separator 12, prevent backflow, and prevent the refrigerant flowing out of the chiller 8 or the two-way valve 9 from flowing to the indoor evaporator 11.

[0039] As shown Figure 3As shown in the figure, it is a schematic diagram of an embodiment of an indirect heat pump air conditioner for electric vehicles provided by the present invention. In this embodiment, it includes: the on-vehicle indoor heating device, the on-vehicle outdoor heating device, the compressor 1, the coolant circulation device, and the HVAC 4; the output end of the compressor 1 is connected to the input end of the on-vehicle indoor heating device, the output end of the on-vehicle indoor heating device is connected to the input end of the on-vehicle outdoor heating device, and the output end of the on-vehicle outdoor heating device is connected to the input end of the compressor 1; the HVAC 4 is respectively connected to the on-vehicle indoor heating device, the on-vehicle outdoor heating device, and the coolant circulation device;

[0040] The in-vehicle interior heating device includes: a three-way valve 16, a first throttle valve 18, an interior evaporator 11, a second throttle valve 19, and a one-way check valve 17, which are connected in sequence; the three-way valve 16 is used to restrict the refrigerant from flowing into the first throttle valve 18, the interior evaporator 11, and the second throttle valve 19 in sequence when the in-vehicle interior cooling device needs to provide heating; specifically, the input end of the three-way valve 16 is connected to the output end of the water-cooled condenser 2 for guiding the refrigerant flowing through the water-cooled condenser 2 into the first throttle valve 18; one output end of the three-way valve 16 is connected to the input end of the first throttle valve 18; the other output end of the three-way valve 16 is respectively connected to the output end of the second throttle valve 19 and the input end of the first electronic expansion valve 3 for restricting the refrigerant output from the second throttle valve 19 from flowing into the first electronic expansion valve 3; it can be understood that the high-temperature and high-pressure refrigerant at the outlet of the compressor 1 passes through the water-cooled condenser 2 and then flows into the input port of the three-way valve 16 and flows into the first throttle valve 18 from the direction of the b valve of the three-way valve 16. The first throttle valve 18 is used to throttle the flowing refrigerant and release the heat of the refrigerant during the throttling process; specifically, the high-temperature and high-pressure refrigerant passes through the first throttle valve 18 and is converted into a lower-temperature and lower-pressure refrigerant under the throttling action and then flows into the interior evaporator 11. The interior evaporator 11 is used to cool the flowing refrigerant and release heat during the cooling process; specifically, the input end of the interior evaporator 11 is respectively connected to the output end of the first throttle valve 18 and the output end of the third electronic expansion valve 10, and the output end of the interior evaporator 11 is connected to the input end of the second throttle valve 19 and the one-way check valve 17; the other end of the one-way check valve 17 is connected to the gas-liquid separator 12; it can be understood that the refrigerant is cooled twice in the interior evaporator 11 into a low-temperature subcooled refrigerant; the low-temperature subcooled refrigerant continues to pass through the one-way check valve 17 and the second throttle valve 19. The second throttle valve 19 is used to throttle the flowing refrigerant and convert the flowing refrigerant into a two-phase refrigerant and release heat during the throttling process; specifically, the low-temperature subcooled refrigerant is converted into a low-temperature and low-pressure two-phase refrigerant under the throttling action and is input into the first electronic expansion valve 3. The one-way check valve 17 is used to restrict the flow direction of the refrigerant, specifically, to restrict the refrigerant from flowing from the interior evaporator 11 to the gas-liquid separator 12, prevent backflow, and prevent the refrigerant flowing out of the chiller 8 or the two-way valve 9 from flowing to the interior evaporator 11.

[0041] The on-vehicle outdoor heating device is used to convert the two-phase refrigerant output by the on-vehicle indoor heating device into a gaseous refrigerant by absorbing the heat of outdoor air, and transmit the gaseous refrigerant back to the compressor 1. In a specific implementation, the on-vehicle outdoor heating device includes: a first electronic expansion valve 3, an outdoor heat exchanger 5, a cooling fan 6, a second electronic expansion valve 7, a water chiller 8, a two-way valve 9, a third electronic expansion valve 10, and a gas-liquid separator 12; the input end of the first electronic expansion valve 3 is respectively connected to the output end of the three-way valve 16 and the output end of the second throttle valve 19, the output end of the first electronic expansion valve 3 is connected to the input end of the outdoor heat exchanger 5, the cooling fan 6 is arranged on the outdoor heat exchanger 5, the output end of the outdoor heat exchanger 5 is respectively connected to the second electronic expansion valve 7, the two-way valve 9, and the third electronic expansion valve 10, the other end of the second electronic expansion valve 7 is connected to the water chiller 8, the other ends of the two-way valve 9 and the water chiller 8 are respectively connected to the gas-liquid separator 12, and the other end of the gas-liquid separator 12 is connected to the compressor 1; the other end of the third electronic expansion valve 10 is respectively connected to the output end of the first throttle valve 18 and the input end of the indoor evaporator 11, and is used to limit the refrigerant flowing through the third electronic expansion valve 10 or the first throttle valve 18 from flowing into the indoor evaporator 11. It can be understood that the low-temperature and low-pressure two-phase refrigerant output by the second throttle valve 19 absorbs the heat of outdoor air through the outdoor heat exchanger 5, is converted into a low-pressure gaseous refrigerant, and finally flows through the two-way valve 9 and the liquid storage tank in sequence and returns to the compressor 1 to continue the cycle.

[0042] The compressor 1 is used to drive the refrigerant in the on-vehicle indoor heating device and the on-vehicle outdoor heating device to circulate.

[0043] The HVAC 4 is used to conduct the heat released by the on-vehicle indoor heating device, the on-vehicle outdoor heating device, and the coolant circulation device to the interior of the vehicle for heating; specifically, the HVAC 4 is provided with an air return port, an air outlet, and an air duct connecting the air return port and the air outlet; the air duct passes through the indoor evaporator 11 and the heater core 15, and is used to divert the air entering from the air return port through the indoor evaporator 11 and the heater core 15, and introduce the heat released by the indoor evaporator 11 and the heater core 15 into the vehicle from the air outlet.

[0044] The coolant circulation device is used to cool the flowing refrigerant and conduct the heat released during the cooling process to the HVAC4. Specifically, the coolant circulation device includes: a water-cooled condenser 2, an electric water pump 13, a PTC 14, and a heater core 15; the refrigerant input by the compressor 1 passes through the water-cooled condenser 2 and is input into the three-way valve 16. One end of the water-cooled condenser 2 is sequentially connected to the PTC 14, the heater core 15, and the electric water pump 13, and the output end of the electric water pump 13 is connected to the other end of the water-cooled condenser 2; in the coolant circuit, the coolant sequentially flows through the water-cooled condenser 2, the PTC 14, and the heater core 15 under the pressure of the water pump.

[0045] In this embodiment, in the heating mode, the second electronic expansion valve 7, the third electronic expansion valve 10, and the one-way check valve 17 are all closed. The high-temperature and high-pressure refrigerant at the outlet of the compressor 1 passes through the water-cooled condenser 2 and then flows into the inlet of the three-way valve 16 and flows into the first throttle valve 18 from the direction of the three-way valve 16b; the high-temperature and high-pressure refrigerant passes through the first throttle valve 18 and is converted into a relatively low-temperature and low-pressure refrigerant under the throttling effect, and then flows into the indoor evaporator 11; the refrigerant is cooled again in the indoor evaporator 11 to become a low-temperature supercooled refrigerant; the low-temperature supercooled refrigerant continues to pass through the one-way check valve 17 and the second throttle valve 19; the low-temperature supercooled refrigerant is converted into a low-temperature and low-pressure two-phase refrigerant under the throttling effect and is input into the first electronic expansion valve 3; the low-temperature and low-pressure two-phase refrigerant absorbs the heat of the outdoor air through the outdoor heat exchanger 5 and is converted into a low-pressure gaseous refrigerant, and finally sequentially flows through the two-way valve 9 and the liquid storage tank and returns to the compressor 1 to continue the cycle.

[0046] An embodiment of the present invention further provides an automobile, including: the indirect heat pump air conditioner for electric vehicles described above.

[0047] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0048] The in-vehicle indoor heating device, the indirect heat pump air conditioner for electric vehicles, and the automobile provided by the present invention use the in-vehicle evaporator as a secondary indoor condenser in a typical indirect heat pump architecture of an automobile air conditioner, and it is expected that the heat pump working condition can save 12% of the air conditioner energy consumption, improve the heating energy efficiency of the heat pump system; increase the system COP value, reduce the air conditioner power consumption, and improve the cruising range of electric vehicles.

[0049] The above-disclosed are only the preferred embodiments of the present invention, and of course, the scope of the rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An indirect heat pump air conditioner for an electric vehicle, characterized in that, Comprising: An in-vehicle interior heating device, an in-vehicle exterior heating device, a compressor, a coolant circulation device, and an HVAC; the output end of the compressor is connected to the input end of the in-vehicle interior heating device, the output end of the in-vehicle interior heating device is connected to the input end of the in-vehicle exterior heating device, and the output end of the in-vehicle exterior heating device is connected to the input end of the compressor; the HVAC is respectively connected to the in-vehicle interior heating device, the in-vehicle exterior heating device, and the coolant circulation device; The in-vehicle exterior heating device is used for absorbing the heat of outdoor air, converting the two-phase refrigerant output by the in-vehicle interior heating device into a gaseous refrigerant, and returning the gaseous refrigerant to the compressor; The compressor is used for driving the refrigerant in the in-vehicle interior heating device and the in-vehicle exterior heating device to circulate; The HVAC is used for conducting the heat released by the in-vehicle interior heating device, the in-vehicle exterior heating device, and the coolant circulation device to the interior of the vehicle for heating; The in-vehicle interior heating device includes: a three-way valve, a first throttle valve, an indoor evaporator, a second throttle valve, and a one-way check valve connected in sequence; The three-way valve is used for restricting the refrigerant from flowing into the first throttle valve, the indoor evaporator, and the second throttle valve in sequence when the in-vehicle interior cooling device needs to be heated; The first throttle valve is used for throttling the flowing refrigerant and releasing the heat of the refrigerant during the throttling process; The indoor evaporator is used for cooling the flowing refrigerant and releasing heat during the cooling process; The second throttle valve is used for throttling the flowing refrigerant, converting the flowing refrigerant into a two-phase refrigerant, and releasing heat during the throttling process; The one-way check valve is used for restricting the flow direction of the refrigerant; The input end of the three-way valve is connected to the output end of the water-cooled condenser for introducing the refrigerant flowing through the water-cooled condenser into the first throttle valve; one output end of the three-way valve is connected to the input end of the first throttle valve; the other output end of the three-way valve is respectively connected to the output end of the second throttle valve and the input end of other in-vehicle heating devices for restricting the refrigerant output by the second throttle valve from flowing into other in-vehicle heating devices; The coolant circulation device is used to cool the flowing refrigerant and conduct the heat released during the cooling process to the HVAC; the on-vehicle outdoor heating device includes: a first electronic expansion valve, an outdoor heat exchanger, a cooling fan, a second electronic expansion valve, a water chiller, a two-way valve, a third electronic expansion valve, and a gas-liquid separator; the input end of the first electronic expansion valve is respectively connected to the output end of the three-way valve and the output end of the second throttle valve, the output end of the first electronic expansion valve is connected to the input end of the outdoor heat exchanger, the cooling fan is arranged on the outdoor heat exchanger, the output end of the outdoor heat exchanger is respectively connected to one end of the second electronic expansion valve, one end of the two-way valve, and one end of the third electronic expansion valve, the other end of the second electronic expansion valve is connected to one end of the water chiller, the other end of the two-way valve and the other end of the water chiller are respectively connected to one end of the gas-liquid separator, and the other end of the gas-liquid separator is connected to the compressor; the other end of the third electronic expansion valve is respectively connected to the output end of the first throttle valve and the input end of the indoor evaporator, and is used to limit the refrigerant flowing through the third electronic expansion valve or the first throttle valve from flowing into the indoor evaporator.

2. The indirect heat pump air conditioner for electric vehicle according to claim 1, characterized in that, The input end of the indoor evaporator is connected to the output end of the first throttle valve, and the output end of the indoor evaporator is respectively connected to the input end of the second throttle valve and a one-way check valve.

3. The indirect heat pump air conditioner for electric vehicle according to claim 2, wherein The other output end of the three-way valve is respectively connected to the output end of the second throttle valve and the input end of the first electronic expansion valve, and is used to limit the refrigerant output by the second throttle valve from flowing into the first electronic expansion valve.

4. The indirect heat pump air conditioner for electric vehicle according to claim 3, wherein The input end of the indoor evaporator is respectively connected to the output end of the first throttle valve and the output end of the third electronic expansion valve, the output end of the indoor evaporator is connected to the input end of the second throttle valve and one end of the one-way check valve; the other end of the one-way check valve is connected to the gas-liquid separator.

5. The indirect heat pump air conditioner for electric vehicle according to claim 4, wherein The coolant circulation device includes: a water-cooled condenser, an electronic water pump, a PTC, and a heater core; the refrigerant output by the compressor sequentially passes through the water-cooled condenser and the three-way valve, one end of the water-cooled condenser is sequentially connected to the PTC, the heater core, and the electronic water pump, and the output end of the electronic water pump is connected to the other end of the water-cooled condenser.

6. The indirect heat pump air conditioner for electric vehicle according to claim 5, characterized in that The HVAC is provided with an air return port, an air outlet, and a duct connecting the air return port and the air outlet; the duct passes through the indoor evaporator and the heater core, and is used to guide the air entering from the air return port to pass through the indoor evaporator and the heater core, and introduce the heat released by the indoor evaporator and the heater core into the vehicle from the air outlet.

7. A vehicle, characterized in that, Including: The indirect heat pump air conditioner for electric vehicles according to any one of claims 1-6.

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