New energy vehicle heat pump air conditioning system

Abstract

The application relates to the technical field of heat pump air conditioners, in particular to a new energy automobile heat pump air conditioner system, which comprises a compressor, a PTC heating unit, a control valve, a condenser, a throttler, an evaporator and a gas-liquid separator which are sequentially connected through pipelines; the outlet end and the inlet end of the compressor are respectively communicated with the PTC heating unit and the gas-liquid separator; the control valve comprises a first interface, a second interface, a third interface and a fourth interface; when the first interface and the second interface are communicated and the third interface and the fourth interface are communicated, the system is in a heating mode; when the first interface and the third interface are communicated and the second interface and the fourth interface are communicated, the system is in a refrigeration mode. The PTC heating unit can directly heat refrigerant, the heat pump air conditioner system can be assisted to heat, and the heat pump air conditioner system can quickly enter a stable working state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump air conditioning, in particular to a new energy vehicle heat pump air conditioning system. BACKGROUND

[0002] With the maturation of the new energy vehicle industry, air conditioning as a functional requirement for driving comfort will inevitably have higher and higher requirements. In terms of development and work efficiency of air conditioning technology, the good working performance of heat pump type air conditioning system will become an important development trend.

[0003] In the prior art, the new energy vehicle heat pump air conditioning system cannot quickly enter the normal working state when starting in cold winter, because the heat pump air conditioning system needs a process for heating, and it is difficult to achieve the desired effect in a short time. Moreover, the air conditioning heat pump system uses air heating or water heating for auxiliary heating, which has high energy consumption, especially the heating body of air heating is located in the cab, which is a high-voltage high-temperature component, and there is a certain safety hazard. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the deficiencies in the prior art and provide a new energy vehicle heat pump air conditioning system.

[0005] The present application is realized by the following technical solutions:

[0006] A new energy vehicle heat pump air conditioning system, comprising a compressor, a PTC heating unit, a control valve, a condenser, a throttler, an evaporator and a gas-liquid separator connected in sequence by pipelines, the outlet end and the inlet end of the compressor are respectively communicated with the PTC heating unit and the gas-liquid separator, and the control valve comprises a first interface, a second interface, a third interface and a fourth interface.

[0007] Preferably, the first interface is communicated with the second interface, and the third interface is communicated with the fourth interface, so that when the refrigerant flows through the compressor, the PTC heating unit, the evaporator, the throttler, the condenser, the gas-liquid separator in sequence and then returns to the compressor, the new energy vehicle heat pump air conditioning system is in a heating working mode.

[0008] Preferably, the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface, so that when the refrigerant flows through the compressor, the PTC heating unit, the condenser, the throttler, the evaporator, the gas-liquid separator in sequence and then returns to the compressor, the new energy vehicle heat pump air conditioning system is in a cooling working mode.

[0009] Preferably, the outlet end of the PTC heating unit is provided with a first branch and a second branch, the first branch is communicated with the first interface of the control valve, and the second branch is communicated with the gas-liquid separator through a one-way valve.

[0010] Preferably, a fan is provided at the condenser.

[0011] Preferably, the heating cavity in the PTC heating unit is a multi-cavity flow channel structure.

[0012] Preferably, the multi-cavity flow channel structure includes a plurality of groups of downstream channels circumferentially arranged in the PTC heating cavity, a plurality of groups of upstream channels arranged between the downstream channels and respectively connected to the ends of the downstream channels, and a confluent channel arranged in the center of the PTC heating unit, the head end of the confluent channel being connected to the end of the upstream channel.

[0013] The beneficial effects of the present invention are:

[0014] Because the PTC heating unit is set at the tail end of the compressor, the refrigerant flowing through the PTC heating unit is heated by operating the controller, so that the high-temperature and high-pressure gaseous refrigerant coming out of the compressor will not be quickly liquefied due to the low ambient temperature, so that the heat pump air-conditioning system can reach a stable working state in a short time, achieve the effect of short-time rapid heating, and directly heat the refrigerant, improve heating efficiency, and greatly reduce energy consumption; and under the action of the second branch at the output end of the PTC heating unit, heat is provided to the gas-liquid separator, which helps to gasify the refrigerant, thereby greatly reducing the energy consumption of the system and reducing the workload of the compressor. The present invention can directly heat the refrigerant through the PTC heating unit to play an auxiliary heating role in the air-conditioning heat pump system, so that the heat pump air-conditioning system can quickly enter a stable working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the connection structure of the heat pump air conditioning system of the present invention.

[0016] Figure 2 It is a structural diagram of the heating mode of the heat pump air-conditioning system of the present invention.

[0017] Figure 3 It is a structural diagram of the refrigeration mode of the heat pump air-conditioning system of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the heating cavity of the PTC heating unit of the present invention.

[0019] In the figure: 1. Compressor, 2. PTC heating unit, 3. Control valve, 4. First interface, 5. Second interface, 6. Third interface, 7. Fourth interface, 8. Condenser, 9. Fan, 10. Throttle, 11. Evaporator, 12. Gas-liquid separator, 13. One-way valve, 14. First branch, 15. Second branch, 16. Downstream channel, 17. Countercurrent channel, 18. Converging channel. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and the best embodiments.

[0021] like Figures 1 to 4 As shown, a new energy vehicle heat pump air conditioning system according to the present invention comprises a compressor 1, a PTC heating unit 2, a control valve 3, a condenser 8, a throttle 10, an evaporator 11 and a gas-liquid separator 12 connected in sequence through pipelines. The outlet and inlet ends of the compressor 1 are respectively connected to the PTC heating unit 2 and the gas-liquid separator 12. The control valve 3 comprises a first interface 4, a second interface 5, a third interface 6 and a fourth interface 7. Through the action of the PTC heating unit 2 connected to the outlet end of the compressor 1, the high-temperature and high-pressure gaseous refrigerant flowing out of the outlet end of the compressor 1 is heated by the PTC heating unit 2, and the hot refrigerant is sprayed into the evaporator 11, which can improve the heat exchange efficiency and solve the problem that the heat pump air conditioning system cannot quickly enter a normal working state in a low-temperature environment.

[0022] It should be noted that, in actual applications, those skilled in the art may set the control valve to a multi-way valve, or may set the control valve to a four-way valve, etc. Such adjustments and changes to the specific type of control valve do not deviate from the principles and scope of the present invention and should be included in the scope of protection of the present invention.

[0023] Preferably, the PTC heating unit 2 includes a PTC heating unit 2 and a controller for realizing the on / off of the PTC heating unit 2 and heating the fluid flowing through the flow channel of the PTC heating unit 2. By operating the controller to realize the on / off of the PTC heating unit 2, when the heat pump air conditioning system is just started in winter, the controller is operated to realize the PTC heating unit 2 to heat the refrigerant flowing through its flow channel, so that the heat pump air conditioning system quickly enters a normal working state. When the heat pump air conditioning system is running stably, the controller is operated to realize the PTC heating unit 2 to stop heating the refrigerant, so that the PTC heating unit 2 plays a role of auxiliary heating for the heat pump air conditioning system.

[0024] Preferably, the first interface 4 is connected to the second interface 5, and the third interface 6 is connected to the fourth interface 7. The refrigerant in the new energy vehicle heat pump air conditioning system flows along a first circulation loop, which includes flowing through the compressor 1, the PTC heating unit 2, the evaporator 11, the throttle 10, the condenser 8, and the gas-liquid separator 12 in sequence before returning to the compressor 1. The new energy vehicle heat pump air conditioning system is in a heating operating mode. When the new energy vehicle heat pump air conditioning system is in a heating operating mode, the outlet end of the compressor 1 is connected to the PTC heating unit 2, and then connected to the second interface 5 through the first interface 4 of the control valve 3, and the third interface 6 is connected to the fourth interface 7, so that the compressor 1 is connected to the evaporator 11 through the PTC heating unit 2 and the control valve 3, and the condenser 8 is connected to the gas-liquid separator 12. Finally, the connection between the gas-liquid separator 12 and the compressor 1 forms the first circulation loop of the refrigerant, achieving a heating function.

[0025] Preferably, the first interface 4 is connected to the third interface 6, and the second interface 5 is connected to the fourth interface 7. The refrigerant in the new energy vehicle heat pump air conditioning system flows along a second circulation loop, which includes flowing through the compressor 1, the PTC heating unit 2, the condenser 8, the throttle 10, the evaporator 11, the gas-liquid separator 12 in sequence and then returning to the compressor 1. The new energy vehicle heat pump air conditioning system is in a cooling operating mode. When the new energy vehicle heat pump air conditioning is in cooling operating mode, the outlet end of the compressor 1 is connected to the PTC heating unit 2, and then connected to the third interface 6 through the first interface 4 of the control valve 3, and the second interface 5 is connected to the fourth interface 7, so that the compressor 1 is connected to the condenser 8 through the PTC heating unit 2 and the control valve 3, and the evaporator 11 is connected to the gas-liquid separator 12. Finally, the connection between the gas-liquid separator 12 and the compressor 1 forms a second circulation loop of the refrigerant, achieving a cooling function.

[0026] Preferably, the outlet end of the PTC heating unit 2 is provided with a first branch 14 and a second branch 15 , the first branch 14 is connected to the first interface 4 of the control valve 3 , and the second branch 15 is connected to the gas-liquid separator 12 through a one-way valve 13 . Through the first branch 14 connected to the first interface 4 of the control valve 3, when the PTC heating unit 2 heats the refrigerant flowing through it, the gaseous refrigerant injected into the evaporator 11 has a certain temperature, thereby improving the heat exchange efficiency and preventing the heat pump air-conditioning system from being unable to quickly enter a normal working state due to the low ambient temperature around the evaporator 11, thereby enabling the new energy vehicle heat pump air-conditioning system to quickly enter a normal working state when it is just started in winter; under the action of the second branch 15 connected to the gas-liquid separator 12, the hot refrigerant flowing out of the outlet end of the PTC heating unit 2 flows into the gas-liquid separator 12 through the one-way valve 13, providing heat for the gas-liquid separator 12, and further contributing to the vaporization of the refrigerant in a low-temperature environment, greatly reducing energy consumption, while reducing the workload of the compressor 1, and reducing the performance requirements of the heat pump air-conditioning system on the compressor 1.

[0027] Preferably, a fan 9 is provided at the condenser 8. In the cooling condition, the fan 9 blows away the heat around the condenser 8 and provides cold air for the condenser 8, thereby improving the heat dissipation efficiency of the condenser 8.

[0028] Preferably, the heating cavity within the PTC heating unit 2 is a multi-cavity flow channel structure, with a PTC heating plate disposed between two adjacent multi-cavity flow channels. The PTC heating plate is used to heat the refrigerant flowing through the multi-cavity flow channels. This multi-cavity flow channel structure facilitates connection of the PTC heating unit 2 to the outlet of the compressor 1. The multi-cavity flow channel structure within the PTC heating unit 2 provides a buffer for noise generated by the operation of the compressor 1, significantly reducing the noise generated by the operation of the compressor 1 and providing a silencing effect, thus eliminating the need for a muffler.

[0029] Preferably, the multi-cavity flow channel structure includes a plurality of groups of downstream channels 16 circumferentially arranged in the PTC heating cavity, a plurality of groups of countercurrent channels 17 arranged between the downstream channels 16 and respectively connected to the ends of the downstream channels 16, and a converging channel 18 arranged in the center of the PTC heating unit 2, wherein the head end of the converging channel 18 is connected to the end of the countercurrent channel 17. The multi-cavity flow channel structure inside the PTC heating unit 2 provides a buffer space for the noise generated by the operation of the compressor 1, greatly reducing the noise generated by the operation of the compressor 1, playing a silencing role, and saving the use of a muffler. At the same time, the multi-cavity flow channel structure inside the PTC heating unit 2 allows the refrigerant to flow into the PTC heating unit 2 through the downstream channel 16 and then flow out of the PTC heating unit 2 through the countercurrent channel 17 and the converging channel 18. The reflux flow of the refrigerant greatly improves the heat exchange efficiency, reduces energy consumption, and makes the heat pump air conditioning system more energy-efficient.

[0030] During operation, when the heat pump air conditioning system of the new energy vehicle is started in winter, the outside temperature is low, the heat pump air conditioning system will produce frost, and it cannot quickly enter the normal working state. By adjusting the control valve 3, the first interface 4 and the second interface 5 are connected, the third interface 6 and the fourth interface 7 are connected, and the outlet section of the PTC is connected to the evaporator 11, and the condenser 8 is connected to the gas-liquid separator 12, so that the refrigerant in the new energy heat pump air conditioning system flows along the first circulation loop. Through the work of the compressor 1, the refrigerant is changed from a low-temperature and low-pressure gas to a high-temperature and high-pressure gas. However, due to the low ambient temperature, when the high-temperature and high-pressure refrigerant comes out of the compressor 1, it is easy to liquefy, thereby affecting the heat exchange efficiency, so that the heat pump air conditioning system cannot quickly enter the normal working state. When the high-temperature and high-pressure refrigerant coming out of the compressor 1 is input into the PTC heating unit 2, the controller of the PTC heating unit 2 is started to The refrigerant in the C heating unit 2 is heated to prevent the high-temperature and high-pressure refrigerant from rapidly liquefying due to the low external temperature, and enters the evaporation chamber to exchange heat with the surrounding environment. After the heat exchange, the ambient temperature around the evaporation chamber rises, which can quickly allow the heat pump air-conditioning system to enter a benign working state, so that the heat pump air-conditioning system reaches a stable working state in a short time. The refrigerant coming out of the evaporator 11 is reduced in pressure by the throttle 10 and becomes a liquid at normal temperature and pressure, and flows into the condenser 8. It is connected through the third interface 6 and the fourth interface 7 of the control valve 3, so that the refrigerant passes through the condenser 8, the control valve 3 and the gas-liquid separator 12 in turn, and then returns to the compressor 1 to enter the next cycle; at the same time, the refrigerant flowing through the PTC heating unit 2 is heated by the PTC heating unit 2, so that the hot refrigerant flows between the heat pump air conditioners, which will melt the frost generated by the heat pump air-conditioning system and play an auxiliary heating role for the heat pump air-conditioning system.

[0031] Under the action of the second branch 15 connected to the gas-liquid separator 12 by the outlet end of the PTC heating unit 2, a part of the refrigerant heated by the PTC heating unit 2 can enter the gas-liquid separator 12, providing heat for the gas-liquid separator 12. The gas-liquid mixed refrigerant in the gas-liquid separator 12 is more conducive to the gasification of the refrigerant after obtaining heat, which not only greatly reduces the energy consumption of the system, but also reduces the workload of the compressor 1.

[0032] Under the auxiliary heating action of the PTC heating unit 2, with the increase of the refrigerant temperature, when the temperature accumulates to a certain degree, the system operation reaches equilibrium, the heat pump air conditioning system can work normally and can work stably without the PTC heating unit 2, the operation controller stops heating the refrigerant by the PTC heating unit 2, at this time, the high-temperature and high-pressure refrigerant from the compressor 1 flows through the PTC heating unit 2, the PTC heating unit 2 no longer heats the refrigerant, the high-temperature and high-pressure refrigerant output by the compressor 1 after work enters the gas-liquid separator 12 through the second branch 15 of the PTC heating unit 2 to provide heat for the gas-liquid separator 12, reduces the working load of the compressor 1, and realizes the auxiliary heating function of the PTC heating unit 2 to the heat pump air conditioner.

[0033] When the new energy automobile heat pump air conditioning system is in the refrigeration mode, the control valve 3 is controlled to make the first interface 4 and the third interface 6 communicate, and the second interface 5 and the fourth interface 7 communicate, the refrigerant is compressed into high-temperature and high-pressure gas by the compressor 1, and then flows into the PTC heating unit 2, the porous channel structure in the PTC heating unit 2 forms a buffer space, which plays a sound-absorbing role for the compressor 1, reduces the noise generated by the operation of the compressor 1, thereby saving the use of the silencer, the refrigerant flowing out of the PTC heating unit 2 enters the condenser 8, exchanges heat to become a normal-temperature and high-pressure liquid, and then enters the evaporator 11 after being decompressed by the throttling device 10, the liquid refrigerant absorbs the heat around the evaporator 11 to become low-temperature and low-pressure steam, reduces the temperature of the surrounding environment of the evaporator 11, and plays a refrigeration role, the low-temperature and low-pressure steam from the evaporator 11 passes through the second interface 5 and the fourth interface 7 of the control valve 3 and the gas-liquid separator 12 in turn, and returns to the compressor 1 to enter the next cycle.

[0034] Due to the PTC heating unit arranged at the tail end of the compressor, the refrigerant flowing through the PTC heating unit is heated by the operation controller, so that the high-temperature and high-pressure gaseous refrigerant compressed by the compressor will not be rapidly liquefied due to the excessively low ambient temperature, the heat pump air conditioning system can reach a stable working state in a short time, the effect of short-time rapid heating is achieved, the refrigerant is directly heated, the heating efficiency is improved, and the energy consumption is greatly reduced; at the same time, the hot refrigerant flowing in the heat pump air conditioner can melt the frost generated by the heat pump air conditioning system, and realize the defrosting function; and under the action of the second branch at the output end of the PTC heating unit, heat is provided for the gas-liquid separator, which is helpful to the vaporization of the refrigerant, thereby greatly reducing the energy consumption of the system and the working load of the compressor. The present application can directly heat the refrigerant by the PTC heating unit to play an auxiliary heating role on the air conditioning heat pump system, so that the heat pump air conditioning system can quickly enter a stable working state.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A new energy vehicle heat pump air conditioning system, characterized by: The invention comprises a compressor, a PTC heating unit, a control valve, a condenser, a throttle, an evaporator and a gas-liquid separator connected in sequence through pipelines, wherein the outlet end of the compressor is connected to the PTC heating unit, the inlet end of the compressor is connected to the gas-liquid separator, and the control valve comprises a first interface, a second interface, a third interface and a fourth interface; When the new energy vehicle heat pump air-conditioning system is in a heating working mode, the first interface is connected to the second interface, and the third interface is connected to the fourth interface, so that the refrigerant flows through the compressor, PTC heating unit, evaporator, throttle, condenser, and gas-liquid separator in sequence and then returns to the compressor; when the new energy vehicle heat pump air-conditioning system is in a cooling working mode, the first interface is connected to the third interface, and the second interface is connected to the fourth interface, so that the refrigerant flows through the compressor, PTC heating unit, condenser, throttle, evaporator, and gas-liquid separator in sequence and then returns to the compressor. The outlet end of the PTC heating unit is provided with a first branch and a second branch. The first branch is connected to the first interface of the control valve, and the second branch is connected to the gas-liquid separator through a one-way valve. Under the action of the second branch connected to the gas-liquid separator, the hot refrigerant flowing out of the outlet end of the PTC heating unit flows into the gas-liquid separator through the one-way valve to provide heat for the gas-liquid separator.

2. A new energy vehicle heat pump air conditioning system according to claim 1, characterized in that: The throttle is an expansion valve.

3. A new energy vehicle heat pump air conditioning system according to claim 2, characterized in that: A fan is provided at the condenser.

4. A new energy vehicle heat pump air conditioning system according to any one of claims 1 to 3, characterized in that: The heating cavity in the PTC heating unit is a multi-cavity flow channel structure.

5. A new energy vehicle heat pump air conditioning system according to claim 4, characterized in that: The multi-cavity flow channel structure includes multiple groups of downstream channels circumferentially arranged in the PTC heating cavity, multiple groups of countercurrent channels arranged between the downstream channels and respectively connected to the ends of the downstream channels, and a converging channel arranged in the center of the PTC heating unit, and the head end of the converging channel is connected to the end of the countercurrent channel.

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