Heat pump air conditioning system and electric vehicle

Abstract

The application provides a heat pump air conditioning system and an electric vehicle. The heat pump air conditioning system comprises a compressor, a condenser, an inlet of which is communicated with an outlet of the compressor, a coaxial pipeline comprising a high-pressure outer tube and a low-pressure inner tube, which are coaxially sleeved, a first flow-through cavity is arranged between the high-pressure outer tube and the low-pressure inner tube, an inlet of the first flow-through cavity is communicated with an outlet of the condenser, the low-pressure inner tube penetrates through a second flow-through cavity, an evaporator, an inlet of which is communicated with an outlet of the first flow-through cavity, an outlet of which is communicated with an inlet of the compressor, and a first throttling valve is arranged at the inlet, a battery cooler, a first inlet of which is communicated with an outlet of the first flow-through cavity, a first outlet of which is communicated with an inlet of the compressor, and a second throttling valve is arranged at the first inlet, a liquid inlet pipeline, two ends of which are respectively communicated with a second inlet of the battery cooler and an outlet of a battery pack, and a water pump is arranged on the liquid inlet pipeline, a liquid outlet pipeline, two ends of which are respectively communicated with a second outlet of the battery cooler and an inlet of the second flow-through cavity, and a liquid return pipeline, two ends of which are respectively communicated with an outlet of the second flow-through cavity and an inlet of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning technology, specifically to a heat pump air conditioning system and an electric vehicle. Background Technology

[0002] Currently, with the booming development of new energy vehicles, the usage rate of heat pump air conditioners is increasing. Automotive air conditioning pipes connect components such as the evaporator, condenser, compressor, and battery cooler, delivering refrigerant to various major components of the air conditioning system to assist in cooling, heating, defrosting, and heat exchange with battery / electronic components. In existing technologies, the refrigerant output from the condenser exists in a partial gas-liquid two-phase state. This two-phase refrigerant entering the evaporator and battery cooler is detrimental to the stable operation of the heat pump air conditioning system. Therefore, there is still room for improvement in ensuring the stable operation of heat pump air conditioning systems. Summary of the Invention

[0003] In view of this, the present invention provides a heat pump air conditioning system and an electric vehicle, wherein a coaxial pipeline is provided between the condenser, the evaporator and the battery cooler, and two flow chambers in the coaxial pipeline respectively flow through the refrigerant delivered by the condenser and the low-temperature coolant cooled by the battery cooler. While the refrigerant and the low-temperature coolant flow in opposite directions, the coolant further cools the refrigerant, so that the refrigerant remains completely liquid, thereby improving the operational stability of the heat pump air conditioning system.

[0004] The heat pump air conditioning system provided by this invention includes: a compressor; a condenser, the inlet of which is connected to the outlet of the compressor; a coaxial pipeline, the coaxial pipeline including a high-pressure outer pipe and a low-pressure inner pipe coaxially sleeved, a first flow cavity provided between the high-pressure outer pipe and the low-pressure inner pipe, and a second flow cavity provided through the low-pressure inner pipe, the inlet of the first flow cavity being connected to the outlet of the condenser; an evaporator, the inlet of which is connected to the outlet of the first flow cavity, the outlet of which is connected to the inlet of the compressor, and a first throttling valve installed at the inlet of the evaporator; and a battery cooler, the first inlet of which is connected to the first flow cavity. The battery cooler has an outlet connected to the compressor inlet, and a second throttle valve is installed at the first inlet of the battery cooler; an inlet pipe has a first end connected to the second inlet of the battery cooler, and a second end connected to the outlet of the battery pack, and a water pump is installed on the inlet pipe; an outlet pipe has a first end connected to the second outlet of the battery cooler, and a second end connected to the inlet of the second flow chamber; and a return pipe has a first end connected to the outlet of the second flow chamber, and a second end connected to the inlet of the battery pack.

[0005] Optionally, the heat pump air conditioning system further includes: a liquid storage tank, the inlet of which is connected to the outlet of the condenser, and the outlet of which is connected to the inlet of the first flow chamber.

[0006] Optionally, the first throttle valve is configured as a first electronic expansion valve; a first temperature sensor is provided at the outlet of the evaporator; the heat pump air conditioning system further includes a controller, the input terminal of which is communicatively connected to the output terminal of the first temperature sensor, and the output terminal of which is communicatively connected to the control terminal of the first electronic expansion valve.

[0007] Optionally, the outlet of the evaporator is provided with a first pressure sensor, and the output of the first pressure sensor is communicatively connected to the input of the controller.

[0008] Optionally, the second throttle valve is configured as a second electronic expansion valve; a second temperature sensor is provided at the first outlet of the battery cooler, the output of the second temperature sensor is communicatively connected to the input of the controller, and the output of the controller is communicatively connected to the control terminal of the second electronic expansion valve.

[0009] Optionally, a second pressure sensor is provided at the first outlet of the battery cooler, and the output of the second pressure sensor is communicatively connected to the input of the controller.

[0010] Optionally, a third temperature sensor is provided at the outlet of the water pump, the output of the third temperature sensor is communicatively connected to the input of the controller, and the output of the controller is communicatively connected to the control terminal of the water pump.

[0011] Optionally, a first temperature and pressure sensor is provided at the inlet of the compressor, and a second temperature and pressure sensor is provided at the outlet of the compressor. The output terminals of the first temperature and pressure sensor and the second temperature and pressure sensor are respectively communicatively connected to the input terminal of the controller, and the output terminal of the controller is communicatively connected to the control terminal of the compressor.

[0012] Optionally, the heat pump air conditioning system further includes: a replenishment tank, the outlet of which is connected to the inlet of the storage tank via a replenishment pipeline, an electrically controlled valve installed on the replenishment pipeline, a liquid level sensor installed inside the storage tank, the output of which is communicatively connected to the input of the controller, and the output of the controller is communicatively connected to the control end of the electrically controlled valve.

[0013] The present invention also provides an electric vehicle including the heat pump air conditioning system described in any of the above claims.

[0014] The technical solutions provided by this invention have at least the following beneficial effects compared with the prior art:

[0015] The heat pump air conditioning system and electric vehicle of this invention have a coaxial pipeline between the condenser, evaporator and battery cooler. The two flow chambers in the coaxial pipeline are respectively filled with refrigerant delivered from the condenser and low-temperature coolant cooled by the battery cooler. While the refrigerant and low-temperature coolant flow in opposite directions, the coolant further cools the refrigerant, keeping the refrigerant completely liquid. This improves the stability of the heat pump air conditioning system, avoids system temperature oscillations or fluctuations, and prevents the heat pump air conditioning system from failing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a heat pump air conditioning system according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A 3D view of the coaxial piping in the heat pump air conditioning system shown.

[0018] Figure 3 for Figure 2 A cross-sectional view of the coaxial piping shown.

[0019] Figure label:

[0020] 1: Compressor; 2: Condenser; 3: Coaxial piping; 31: High-pressure outer pipe; 32: Low-pressure inner pipe; 33: Second flow chamber; 34: High-pressure lead-out connector; 35: Connecting pipe; 4: Evaporator; 5: Battery cooler; 6: Liquid inlet pipe; 7: Liquid outlet pipe; 8: Liquid return pipe; 9: First throttle valve; 10: Second throttle valve; 11: Battery pack; 12: Water pump; 13: Liquid storage tank. Detailed Implementation

[0021] The embodiments of the present invention will be further described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of the present invention and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0022] Figure 1 This is a schematic diagram of a heat pump air conditioning system according to an embodiment of the present invention; Figure 2 for Figure 1 A 3D view of the coaxial piping in the heat pump air conditioning system shown. Figure 3 for Figure 2 A cross-sectional view of the coaxial piping shown.

[0023] like Figures 1-3 As shown, the heat pump air conditioning system includes a compressor 1, a condenser 2, a coaxial pipe 3, an evaporator 4, a battery cooler 5, an inlet pipe 6, an outlet pipe 7, and a return pipe 8.

[0024] The inlet of the condenser 2 is connected to the outlet of the compressor 1; the coaxial pipeline 3 includes a high-pressure outer pipe 31 and a low-pressure inner pipe 32 coaxially sleeved, a first flow chamber is provided between the high-pressure outer pipe 31 and the low-pressure inner pipe 32, and a second flow chamber 33 is provided through the low-pressure inner pipe 32, the inlet of the first flow chamber is connected to the outlet of the condenser 2; the inlet of the evaporator 4 is connected to the outlet of the first flow chamber, the outlet of the evaporator 4 is connected to the inlet of the compressor 1, and a first throttle valve 9 is installed at the inlet of the evaporator 4; the first inlet of the battery cooler 5 is connected to the outlet of the first flow chamber, and the battery cooler... The first outlet of the battery cooler 5 is connected to the inlet of the compressor 1, and a second throttle valve 10 is installed at the first inlet of the battery cooler 5; the first end of the liquid inlet pipe 6 is connected to the second inlet of the battery cooler 5, and the second end of the liquid inlet pipe 5 is used to connect to the outlet of the battery pack 11, and a water pump 12 is installed on the liquid inlet pipe 6; the first end of the liquid outlet pipe 7 is connected to the second outlet of the battery cooler 5, and the second end of the liquid outlet pipe 7 is connected to the inlet of the second flow chamber 33; the first end of the liquid return pipe 8 is connected to the outlet of the second flow chamber 33, and the second end of the liquid return pipe 8 is used to connect to the inlet of the battery pack 11.

[0025] The heat pump air conditioning system described in this invention is only used for cooling the battery pack. During system operation, a portion of the refrigerant, after passing through the second throttle valve 10, becomes a low-temperature, low-pressure refrigerant and enters the battery cooler 5 through the first inlet. The coolant in the battery pack, which absorbs heat from the battery, enters the battery cooler 5 through the second inlet. The low-temperature refrigerant and the high-temperature coolant exchange heat within the battery cooler 5. The refrigerant absorbs heat from the coolant, heats up, and enters the compressor 1 in a gaseous state. The low-temperature coolant, after dissipating heat, is transported to the second flow chamber 33 of the coaxial pipe 3 through the second outlet of the battery cooler 5 and the outlet pipe 7. A portion of the refrigerant, after passing through the first throttle valve 9, becomes a low-temperature, low-pressure refrigerant and enters the evaporator 4. The low-temperature, low-pressure refrigerant absorbs heat emitted by the battery cooler 5 and heat from the vehicle interior, heats up, and also enters the compressor 1 in a gaseous state. The compressor 1 discharges high-temperature, high-pressure refrigerant gas through its outlet to the condenser 2 for heat dissipation. The cooled, medium-temperature, high-pressure refrigerant... The refrigerant, which is at medium temperature and high pressure, flows in the first flow chamber of the coaxial pipe 3 in the opposite direction to the flow direction of the coolant, which is at low temperature, in the second flow chamber 33. This allows the medium-temperature, high-pressure refrigerant and the coolant to fully exchange heat in the coaxial pipe 3. After absorbing some of the heat from the refrigerant, the coolant returns to the battery pack through the outlet of the second flow chamber 33 and the return pipe 8, where it reabsorbs heat from the battery pack. After the refrigerant absorbs some heat from the coolant, it achieves subcooling. At this point, the refrigerant is entirely in a liquid state. Part of the liquid refrigerant enters the battery cooler 5 through the second throttle valve 10 and exchanges heat with the coolant in the battery cooler 5 again. After the heat exchange, it becomes gaseous refrigerant and re-enters the compressor 1. At the same time, part of the liquid refrigerant enters the evaporator 4 through the first throttle valve 9, absorbing heat emitted by the battery cooler 5 and heat from inside the vehicle. After absorbing heat and becoming gaseous refrigerant, it re-enters the compressor 1, and so on.

[0026] The heat pump air conditioning system of the present invention includes a coaxial pipe 3 installed between the condenser 2, the evaporator 4, and the battery cooler 5. Two flow chambers within the coaxial pipe 3 are respectively filled with refrigerant supplied from the condenser 2 and low-temperature coolant cooled by the battery cooler 5. As the refrigerant and low-temperature coolant flow in opposite directions, the coolant further cools the refrigerant, ensuring it remains completely liquid. This improves the operational stability of the heat pump air conditioning system, prevents system temperature fluctuations or oscillations, and avoids system failure.

[0027] Figure 1The solid line represents the refrigerant circuit, and the dashed line represents the battery pack coolant circuit. As shown in the diagram, the refrigerant circulates in the refrigerant circuit consisting of compressor 1-condenser 2-coaxial pipe 3-evaporator 4 / battery cooler 5-compressor 1, and the coolant circulates in the coolant circuit consisting of battery pack 11-battery cooler 5-coaxial pipe 3-battery pack 11. Figure 2 , Figure 3 As shown, the high-pressure outer tube 31 and the low-pressure inner tube 32 of the coaxial conduit 3 are both hollow cylinders. The length of the high-pressure outer tube 31 is less than the length of the low-pressure inner tube 32, and the inner diameter of the high-pressure outer tube 31 is greater than the outer diameter of the low-pressure inner tube 32. The low-pressure inner tube 32 is fitted into and fixed in the middle of the low-pressure inner tube 32. The gap between the high-pressure outer tube 31 and the low-pressure inner tube 32 constitutes the first flow cavity, and the space inside the low-pressure inner tube 32 constitutes the second flow cavity 33. Figure 2 , Figure 3 As shown, high-pressure lead-out connectors 34 are installed at the inlet and outlet of the first flow cavity, respectively. Each high-pressure lead-out connector 34 is connected to a connecting pipe 35 to facilitate the input and output of refrigerant. Figure 3 As shown, the coolant cooled by the battery cooler 5 enters through the outlet pipe 7 from the right inlet of the second flow chamber 33 and exits through the left outlet to the return pipe 8. The refrigerant output from the condenser 2 enters the first flow chamber through the left connecting pipe 35, exchanges heat with the low-temperature coolant in the second flow chamber 33 within the length of the high-pressure outer pipe 31, and then exits through the right connecting pipe 35 to the first throttle valve 9 and the second throttle valve 10. The effective length of the high-pressure outer pipe 31 is the length of the refrigerant heat exchange section. Relevant test data shows that when the length of the refrigerant heat exchange section of the coaxial pipe 3 is 300 mm, a subcooling of about 3 degrees Celsius can be obtained. This value will vary depending on the specific design of the coaxial pipe and the temperature of the refrigerant and coolant passing through the coaxial pipe. The specific shape and size of the high-pressure outer pipe 31 and the low-pressure inner pipe 32 can be adjusted according to the actual application.

[0028] Optionally, the heat pump air conditioning system further includes a liquid storage tank 13, the inlet of which is connected to the outlet of the condenser 2, and the outlet of which is connected to the inlet of the first flow chamber. By providing the liquid storage tank 13, the refrigerant output from the condenser 2 first enters the liquid storage tank 13 for pressure stabilization, and then the stabilized refrigerant enters the first flow chamber of the coaxial pipe 3 to exchange heat with the low-temperature coolant in the second flow chamber 33.

[0029] Optionally, the first throttling valve 9 is configured as a first electronic expansion valve; a first temperature sensor (not shown) is installed at the outlet of the evaporator 4; the heat pump air conditioning system further includes a controller (not shown), the input terminal of which is communicatively connected to the output terminal of the first temperature sensor, and the output terminal of which is communicatively connected to the control terminal of the first electronic expansion valve. With this configuration, the controller automatically adjusts the opening of the first electronic expansion valve according to the temperature of the refrigerant at the outlet of the evaporator 4, resulting in faster response and action speed, and higher system temperature regulation accuracy.

[0030] During system operation, the first temperature sensor monitors the refrigerant temperature at the outlet of the evaporator 4 in real time and transmits the first temperature data to the controller. The controller has a pre-stored correspondence between different first temperature data and the opening degree of the first electronic expansion valve. The controller then adjusts the opening degree of the first electronic expansion valve in real time according to the first temperature data. The control logic of the controller controlling the opening degree of the first electronic expansion valve according to the first temperature data can be implemented using existing mature algorithms, and will not be elaborated here.

[0031] Optionally, the outlet of the evaporator 4 is equipped with a first pressure sensor (not shown), and the output of the first pressure sensor is communicatively connected to the input of the controller. With this configuration, the controller automatically adjusts the opening of the first electronic expansion valve based on the first pressure data of the refrigerant at the outlet of the evaporator 4 monitored by the first pressure sensor. This, together with the first temperature sensor, controls the opening adjustment of the first electronic expansion valve, providing a double safety measure.

[0032] During system operation, the first pressure sensor monitors the refrigerant pressure at the outlet of evaporator 4 in real time and transmits the pressure data to the controller. The controller has a pre-stored correspondence between different first pressure data and the opening degree of the first electronic expansion valve. The controller then adjusts the opening degree of the first electronic expansion valve in real time based on the first pressure data. The control logic for controlling the opening degree of the first electronic expansion valve based on the first pressure data can be implemented using existing mature algorithms and will not be elaborated here. The first pressure data, the first temperature data, and the corresponding opening degree of the first electronic expansion valve pre-stored in the controller are matched. When both are working normally, the opening degree of the corresponding first electronic expansion valve is consistent. When a sensor malfunctions, the controller adjusts the opening degree of the first electronic expansion valve based on the data monitored by the normally functioning sensor.

[0033] Optionally, the second throttle valve 10 is configured as a second electronic expansion valve; a second temperature sensor (not shown) is provided at the first outlet of the battery cooler 5, the output of the second temperature sensor being communicatively connected to the input of the controller, and the output of the controller being communicatively connected to the control terminal of the second electronic expansion valve. With this configuration, the controller automatically adjusts the opening of the second electronic expansion valve according to the temperature of the refrigerant at the outlet of the battery cooler 5, resulting in faster response and action speed, and higher system temperature regulation accuracy.

[0034] During system operation, the second temperature sensor monitors the second temperature of the refrigerant at the outlet of the battery cooler 5 in real time and transmits the second temperature data to the controller. The controller has a pre-stored correspondence between different second temperature data and the opening degree of the second electronic expansion valve. The controller then adjusts the opening degree of the second electronic expansion valve in real time according to the second temperature data. The control logic of the controller controlling the opening degree of the second electronic expansion valve according to the second temperature data can be implemented using existing mature algorithms, and will not be elaborated here.

[0035] Optionally, a second pressure sensor is provided at the first outlet of the battery cooler 5, and the output of the second pressure sensor is communicatively connected to the input of the controller. With this configuration, the controller automatically adjusts the opening of the second electronic expansion valve based on the second pressure data of the refrigerant at the outlet of the battery cooler 5 monitored by the second pressure sensor. This, together with the second temperature sensor, controls the opening adjustment of the second electronic expansion valve, providing a double safety measure.

[0036] During system operation, the second pressure sensor monitors the second pressure of the refrigerant at the outlet of the battery cooler 5 in real time and transmits the second pressure data to the controller. The controller has a pre-stored correspondence between different second pressure data and the opening degree of the second electronic expansion valve. The controller then adjusts the opening degree of the second electronic expansion valve in real time according to the second pressure data. The control logic of the controller controlling the opening degree of the second electronic expansion valve according to the second pressure data can be implemented using existing mature algorithms, and will not be elaborated here. The second pressure data, the second temperature data, and the corresponding opening degree of the second electronic expansion valve pre-stored in the controller are matched. When both are working normally, the opening degree of the corresponding second electronic expansion valve is consistent. When a sensor fails, the controller adjusts the opening degree of the second electronic expansion valve according to the data monitored by the normally functioning sensor.

[0037] Optionally, a third temperature sensor (not shown) is provided at the outlet of the water pump 12. The output of the third temperature sensor is communicatively connected to the input of the controller, and the output of the controller is communicatively connected to the control terminal of the water pump 12. With this configuration, the controller automatically adjusts the output power of the water pump 12 based on the temperature change of the coolant at the outlet of the water pump 12, thereby adjusting the flow rate of the coolant in the loop and ultimately regulating the heat exchange efficiency of the coolant.

[0038] During system operation, the third temperature sensor monitors the coolant temperature at the outlet of the water pump 12 in real time and transmits the coolant temperature data to the controller. The controller has a pre-stored correspondence between coolant temperature data and the output power of the water pump 12. The controller then automatically adjusts the output power of the water pump 12 based on the coolant temperature data, ultimately regulating the heat exchange efficiency of the coolant. The control logic for adjusting the output power of the water pump 12 based on the coolant temperature data can be implemented using existing mature algorithms, and its specific working principle will not be elaborated here.

[0039] Optionally, a first temperature and pressure sensor (not shown) is installed at the inlet of the compressor 1, and a second temperature and pressure sensor (not shown) is installed at the outlet of the compressor. The output terminals of the first and second temperature and pressure sensors are respectively communicatively connected to the input terminal of the controller, and the output terminal of the controller is communicatively connected to the control terminal of the compressor 1. With this configuration, the controller automatically adjusts the output power of the compressor 1 based on changes in temperature and pressure at the inlet and outlet of the compressor 1, thereby adjusting the flow rate of the refrigerant in the circuit and ultimately regulating the heat exchange efficiency of the refrigerant.

[0040] During system operation, the first temperature and pressure sensor monitors the first temperature and pressure data at the inlet of compressor 1 in real time, and the second temperature and pressure sensor monitors the second temperature and pressure data at the outlet of compressor 1 in real time. Both the first and second temperature and pressure data are transmitted to the controller. The controller receives the first and second temperature and pressure data, performs a difference operation on them, and obtains the temperature and pressure difference data. The controller has a pre-stored correspondence between the temperature and pressure difference data and the output power of compressor 1. Therefore, the controller automatically adjusts the output power of compressor 1 according to the temperature and pressure difference data, ultimately adjusting the heat exchange efficiency of the refrigerant. The control logic of the controller adjusting the output power of compressor 1 according to the temperature and pressure difference data can be implemented using existing mature algorithms, and its specific working principle will not be elaborated here.

[0041] Optionally, the heat pump air conditioning system further includes a replenishment tank (not shown), the outlet of which is connected to the inlet of the storage tank 13 via a replenishment pipeline. An electrically controlled valve is installed on the replenishment pipeline. A liquid level sensor (not shown) is installed inside the storage tank 13. The output of the liquid level sensor is communicatively connected to the input of the controller, and the output of the controller is communicatively connected to the control terminal of the electrically controlled valve. This configuration allows for timely replenishment when the liquid level in the storage tank 13 is detected to be too low, i.e., insufficient refrigerant, thus preventing disruption to the normal operation of the system.

[0042] The liquid level sensor monitors the liquid level in the storage tank 13 in real time and transmits the liquid level data to the controller. The controller has pre-stored high and low level thresholds. When the liquid level is less than or equal to the low level threshold, the controller controls the solenoid valve to open. If the replenishment tank contains refrigerant, the refrigerant in the replenishment tank is added to the storage tank 13 through the replenishment pipeline. When the liquid level is greater than or equal to the high level threshold, the controller controls the solenoid valve to close, and the replenishment tank stops adding refrigerant to the storage tank 13. The control logic of the controller automatically replenishing refrigerant to the storage tank 13 based on the liquid level data can be implemented using existing mature algorithms, and its specific working principle will not be elaborated here.

[0043] The present invention also provides an electric vehicle including the heat pump air conditioning system described in any of the above embodiments.

[0044] The second end of the liquid inlet pipe 6 of the heat pump air conditioning system is connected to the outlet of the battery pack of the electric vehicle, and the second end of the liquid return pipe 8 of the heat pump air conditioning system is connected to the inlet of the battery pack.

[0045] The electric vehicle using this invention has a coaxial pipe 3 installed between the condenser 2, the evaporator 4, and the battery cooler 5. The two flow chambers in the coaxial pipe 3 are respectively filled with refrigerant supplied by the condenser 2 and low-temperature coolant cooled by the battery cooler 5. While the refrigerant and the low-temperature coolant flow in opposite directions, the coolant further cools the refrigerant, keeping the refrigerant completely liquid. This improves the stability of the heat pump air conditioning system, avoids system temperature fluctuations, and prevents the heat pump air conditioning system from failing.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat pump air conditioning system, characterized in that, include: compressor; A condenser, the inlet of which is connected to the outlet of the compressor; The coaxial pipeline includes a high-pressure outer pipe and a low-pressure inner pipe coaxially sleeved together. A first flow cavity is provided between the high-pressure outer pipe and the low-pressure inner pipe. A second flow cavity is provided through the low-pressure inner pipe. The inlet of the first flow cavity is connected to the outlet of the condenser. An evaporator, wherein the inlet of the evaporator is connected to the outlet of the first flow chamber, the outlet of the evaporator is connected to the inlet of the compressor, and a first throttling valve is installed at the inlet of the evaporator; A battery cooler, wherein the first inlet of the battery cooler is connected to the outlet of the first flow chamber, the first outlet of the battery cooler is connected to the inlet of the compressor, and a second throttle valve is installed at the first inlet of the battery cooler; The liquid inlet pipe has a first end connected to the second inlet of the battery cooler and a second end connected to the outlet of the battery pack. A water pump is installed on the liquid inlet pipe. The liquid outlet pipe has a first end connected to the second outlet of the battery cooler and a second end connected to the inlet of the second flow chamber. The return liquid pipeline has a first end connected to the outlet of the second flow chamber and a second end connected to the inlet of the battery pack. The first flow chamber contains refrigerant supplied by the condenser, and the second flow chamber contains cryogenic coolant cooled by the battery cooler. As the refrigerant and cryogenic coolant flow in opposite directions, the cryogenic coolant further cools the refrigerant, keeping it completely liquid.

2. The heat pump air conditioning system according to claim 1, characterized in that, Also includes: A liquid storage tank, the inlet of which is connected to the outlet of the condenser, and the outlet of which is connected to the inlet of the first flow chamber.

3. The heat pump air conditioning system according to claim 2, characterized in that: The first throttle valve is configured as a first electronic expansion valve; The outlet of the evaporator is equipped with a first temperature sensor; The heat pump air conditioning system also includes a controller, the input terminal of which is communicatively connected to the output terminal of the first temperature sensor, and the output terminal of which is communicatively connected to the control terminal of the first electronic expansion valve.

4. The heat pump air conditioning system according to claim 3, characterized in that: The outlet of the evaporator is equipped with a first pressure sensor, and the output of the first pressure sensor is communicatively connected to the input of the controller.

5. The heat pump air conditioning system according to claim 3 or 4, characterized in that: The second throttle valve is configured as a second electronic expansion valve; The first outlet of the battery cooler is equipped with a second temperature sensor. The output of the second temperature sensor is communicatively connected to the input of the controller, and the output of the controller is communicatively connected to the control terminal of the second electronic expansion valve.

6. The heat pump air conditioning system according to claim 5, characterized in that: The first outlet of the battery cooler is equipped with a second pressure sensor, and the output of the second pressure sensor is communicatively connected to the input of the controller.

7. The heat pump air conditioning system according to claim 3 or 4, characterized in that: The outlet of the water pump is equipped with a third temperature sensor. The output of the third temperature sensor is communicatively connected to the input of the controller, and the output of the controller is communicatively connected to the control terminal of the water pump.

8. The heat pump air conditioning system according to claim 3 or 4, characterized in that: The compressor is equipped with a first temperature and pressure sensor at its inlet and a second temperature and pressure sensor at its outlet. The outputs of the first and second temperature and pressure sensors are respectively connected to the input of the controller, and the output of the controller is connected to the control terminal of the compressor.

9. The heat pump air conditioning system according to claim 3 or 4, characterized in that, Also includes: A replenishment tank is provided, the outlet of which is connected to the inlet of a storage tank via a replenishment pipeline. An electrically controlled valve is installed on the replenishment pipeline. A liquid level sensor is installed inside the storage tank. The output of the liquid level sensor is communicatively connected to the input of a controller. The output of the controller is communicatively connected to the control terminal of the electrically controlled valve.

10. An electric vehicle, characterized in that, Includes the heat pump air conditioning system according to any one of claims 1-9.

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