Cleaning device and cleaning process for heat pump air conditioning system of new energy vehicle

Abstract

The invention relates to a cleaning device and a cleaning process for a heat pump air conditioning system of a new energy vehicle. A four-way reversing valve; a pressurizing unit; the air valve unit comprises a first air valve and a second air valve, the pressurizing unit comprises an air pump, one end of the first air valve is communicated with a pipeline between the water pump and the four-way reversing valve, the other end of the first air valve is connected with the air pump, and the two ends of the second air valve are communicated with an outlet of the first filter and the liquid storage tank respectively; a valve capable of closing the pipeline is also arranged between the outlet of the first filter and the liquid storage tank, and the valve capable of closing the pipeline is connected with the second air valve in parallel; the invention further discloses a new energy vehicle heat pump air conditioning system cleaning process. The process comprises the following steps that equipment is connected; bidirectional cleaning; discharging waste liquid; circularly cleaning; blow-drying the pipeline; and accumulated pressure blowing is performed. According to the new energy vehicle heat pump air-conditioning system cleaning device and the cleaning process, the new energy vehicle heat pump air-conditioning system is cleaned, and cleaning liquid is prevented from remaining in the pipeline.

Description

TECHNICAL FIELD

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

[0002] The heat pump air conditioner is an important component of many new energy vehicles, and whether it can work normally and efficiently is of great significance to the vehicle. The representative Tesla electric vehicle heat pump air conditioner adopts a highly integrated super manifold, which integrates multiple expansion valves and micro-channel pipelines inside, has obvious efficiency advantage, but also leads to the problem of complex refrigerant circuit structure and easy failure. Common causes include metal debris blockage, desiccant pollution, and cooling liquid mixed with refrigerant to form oily gel attached to the pipe wall. These problems directly lead to a possible decrease of more than 40% in system heating efficiency, seriously affecting the normal use of the vehicle and user experience.

[0003] In view of the above problems, the current maintenance scheme mainly includes three types: one is to replace the assembly, the second is to disassemble and clean the scheme, and the third is to circulate and clean. The cost of replacing the assembly is amazing, and the disassembly and cleaning generally requires disassembling the super manifold, and then performing ultrasonic soaking and manual brushing. The process is complex, and the risk of sealing failure after reassembly is more than 30%, which is easy to cause refrigerant leakage.

[0004] As for ordinary circulating cleaning, although it has certain cost advantage and is relatively simple to operate, due to the fact that the pipeline of the new energy vehicle heat pump air conditioning system is too complex, the ordinary water circulating cleaning machine cannot clean it thoroughly. The reason is that the conventional water circulating cleaning machine usually pours the chemical agent prepared in advance into the pipeline system, so that the chemical agent reacts with the pipe wall dirt, and then the sewage is discharged to achieve the cleaning purpose. However, due to the fact that the new energy vehicle heat pump air conditioning system integrates multiple valves and micro-channel pipelines inside, the sewage after cleaning is difficult to completely discharge from the system, even if clean cleaning agent is replaced for repeated cleaning, it will also be contaminated by the dirt remaining in the pipeline. To achieve relatively thorough cleaning, a considerable number of times need to be repeated. SUMMARY

[0005] In view of the defects of the prior art, the technical problem to be solved by the present application is to provide a new energy vehicle heat pump air conditioning system cleaning device and cleaning process, which can efficiently and relatively thoroughly clean the new energy vehicle heat pump air conditioning system, and avoid cleaning liquid remaining in the pipeline.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0007] The application discloses a new energy vehicle heat pump air conditioning system cleaning device, which comprises a cleaning liquid unit, a four-way reversing valve, a pressurizing unit, a filtering unit and a gas valve unit.

[0008] The new energy vehicle heat pump air conditioning system cleaning device can avoid the problem that water or other liquid will inevitably mix with a part of the contaminated cleaning liquid when the residual cleaning liquid is flushed with water or other liquid, so that the pipeline is difficult to be thoroughly cleaned, and the residual cleaning liquid can be pushed out of the air conditioning system with the pressure increase of the pipeline.

[0009] Further, the filtering unit further comprises a second filter, the second filter is arranged in the center of the liquid storage tank, a filtering area is formed in the second filter, a to-be-filtered area is formed between the second filter and the liquid storage tank, a second air valve is in communication with the to-be-filtered area of the liquid storage tank, and an inlet end of the water pump is in communication with the filtering area. After the impurities are filtered by the first filter, a small amount of impurities will still be circulated to the liquid storage tank, and if the water pump sucks the cleaning liquid containing impurities in the liquid storage tank at this time, the pump body will be damaged. The second filter is arranged in the liquid storage tank to block the impurities again, so that the impurities in the cleaning liquid are effectively reduced, and the operation stability of the high-pressure water pump is improved. More importantly, the design can fully utilize the kinetic energy of the pressure accumulation and blowing, so that the residual liquid blown out stirs the cleaning liquid to generate the required turbulent flow and vortex for filtering, and the second filter arranged in the liquid storage tank connected with the second air valve can achieve good filtering effect.

[0010] Further, the new energy vehicle heat pump air conditioning system cleaning device further comprises an external hanging unit, the external hanging unit is connected with a mode switching control system of the to-be-cleaned heat pump air conditioning system, and the external hanging unit can adjust the communication state of the pipeline of the to-be-cleaned heat pump air conditioning system to various actual working conditions. Due to the complexity of the pipeline of the new energy vehicle heat pump air conditioning system, if all the pipeline valves are opened at the same time, the pipeline will form a network shape, which not only causes a cleaning dead angle of the cleaning liquid, but also greatly reduces the pressure accumulation and blowing effect due to the complexity of the pipeline. Therefore, the external hanging unit is used to control the pipeline to simulate different communication states of actual working conditions, which can effectively improve the cleaning effect although multiple cleaning is required.

[0011] Further, the water pump is a high-pressure plunger pump, an automatic exhaust valve is further arranged on the liquid storage tank, and a pressure regulating valve is a valve for realizing pipeline closure. Since the high-pressure plunger pump can form a high-frequency pulse water flow, if air exists in the cleaning circuit, the air in the pipeline will form a spring effect to offset the kinetic energy of the water flow. Therefore, the automatic exhaust valve is specially arranged on the liquid storage tank, so that the liquid storage tank can be filled with cleaning liquid to avoid residual air. The pressure regulating valve can adjust the cleaning pressure of the cleaning liquid according to the pollution state of the to-be-cleaned heat pump air conditioning system, fully play the role of the high-pressure plunger pump, and also realize pipeline closure.

[0012] Further, the new energy vehicle heat pump air conditioning system cleaning device further comprises a flow meter and a liquid supply barrel, the liquid supply barrel has at least two, any one of the liquid supply barrels is provided with an independent liquid suction device, the flow meter is arranged between the pressure regulating valve and the liquid storage tank, and the liquid outlet end of the liquid suction device is connected between the flow meter and the pressure regulating valve. With such a design, the cleaning device can automatically add liquid of different stages of multiple cleaning agents through multiple sets of liquid supply barrels and liquid suction devices, and the flow meter can have two functions: one is to accurately display and control the liquid adding amount of the cleaning device, and the other is that the flow in the cleaning circuit can reflect the pipeline blockage or cleaning state in the cleaning state.

[0013] Further, the new energy vehicle heat pump air conditioning system cleaning device further comprises a pressure measuring unit, the pressure measuring unit comprises a first pressure sensor, a second pressure sensor and a third pressure sensor, the first pressure sensor and the second pressure sensor are respectively arranged at the liquid inlet interface and the liquid outlet interface of the four-way reversing valve, and the third pressure sensor is installed at the outlet of the first filter. The first pressure sensor controls the water pump output pressure on one hand, and on the other hand, the pressure difference between the first pressure sensor and the second pressure sensor reflects the blockage or pollution of the air conditioning system to be cleaned, so that the cleaning device can be flexibly reversed according to the setting (reverse cleaning can achieve certain effect when blocked). The pressure difference between the second pressure sensor and the third sensor can reflect the pollution state of the first filter, and can remind the user to replace the filter in time.

[0014] The application further provides a new energy vehicle heat pump air conditioning system cleaning process, which uses the new energy vehicle heat pump air conditioning system cleaning device to clean the new energy vehicle heat pump air conditioning system, and comprises the following steps: device connection: connecting the high-pressure interface and the low-pressure interface of the cleaning device to the high-pressure pipe and the low-pressure pipe of the heat pump air conditioning system to be cleaned; bidirectional cleaning: injecting clean cleaning liquid into the liquid storage tank, starting the water pump to drive the cleaning liquid to flow from the liquid storage tank to the heat pump air conditioning system to be cleaned through the four-way reversing valve along the high-pressure pipe or the low-pressure pipe, and then flowing out through the low-pressure pipe or the high-pressure pipe, and then returning to the liquid storage tank through the first filter, and after a certain number of cycles, the four-way reversing valve is reversed to make the cleaning liquid flow reversely in the heat pump air conditioning system to be cleaned, and the same cycle is repeated for a certain number of times; waste liquid discharge: closing the water pump and discharging the contaminated cleaning liquid in the liquid storage tank; circulating cleaning: repeating the bidirectional cleaning and waste liquid discharge steps at least once; pipeline drying: opening the air pump and using high-pressure gas flow to dry the pipeline of the heat pump air conditioning system; and further comprising pressure accumulation and blowing: after the waste liquid discharge step, closing the valve and the second air valve that can realize pipeline sealing, opening the air pump and the first air valve, and after the air pressure rises, opening the second air valve to instantaneously flush out the liquid remaining in the pipeline, and closing the air pump after completion, and performing the pressure accumulation and blowing step after each circulating cleaning.

[0015] Further, the circulating cleaning step repeats the bidirectional cleaning and waste liquid discharge steps twice, that is, the bidirectional cleaning and waste liquid discharge steps are performed three times, and the cleaning liquid used in the three times is respectively strong solubility cleaning liquid, weak solubility cleaning liquid and volatile cleaning liquid. The strong solubility cleaning liquid and the weak solubility cleaning liquid can be used for rough cleaning and fine cleaning respectively, and the volatile cleaning liquid can dissolve the previously remaining cleaning liquid, and can quickly leave the air conditioning pipeline in the subsequent pipeline drying step due to the volatile property, so as to ensure the cleanliness of the pipeline system and avoid pollution of the refrigerant.

[0016] Further, in the bidirectional cleaning step, the pipeline communication state of the heat pump air conditioning system to be cleaned is adjusted to the pipeline communication state under various actual working conditions respectively for cleaning. The opening and closing of the valves in various modes of the heat pump air conditioner are simulated, each line of the super manifold is accurately cleaned, and the cleaning effect is improved.

[0017] Further, in the pressure accumulation blowing step, the pipeline communication state of the heat pump air conditioning system to be cleaned is adjusted to the pipeline communication state under various actual working conditions respectively for blowing. The opening and closing of the valves in various modes of the heat pump air conditioner are simulated, each line of the super manifold is accurately blown, and the blowing effect is improved.

[0018] In summary, such a new energy vehicle heat pump air conditioning system cleaning device and cleaning process can efficiently and relatively completely clean the new energy vehicle heat pump air conditioning system, and avoid residual cleaning liquid in the pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0020] Figure 1 is a brief description of the device connection node of the embodiment;

[0021] Figure 2 is a process flow diagram of the embodiment;

[0022] Among them, cleaning liquid unit-1, liquid storage tank-11, automatic exhaust valve-12, safety valve-13, waste liquid bucket-14, liquid discharge electromagnetic valve-15, four-way reversing valve-2, high-pressure interface-21, low-pressure interface-22, liquid inlet interface-23, liquid outlet interface-24, pressurizing unit-3, water pump-31, air pump-32, filtering unit-4, first filter-41, second filter-42, filtering area-43, area to be filtered-44, air valve unit-5, first air valve-51, second air valve-52, pressure regulating valve-6, flow meter-7, liquid supply bucket-8, liquid suction device-81, pressure measuring unit-9, first pressure sensor-91, second pressure sensor-92, third pressure sensor-93. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments.

[0024] The application discloses a new energy vehicle heat pump air conditioning system cleaning device, which comprises a cleaning liquid unit 1, a four-way reversing valve 2, a pressurizing unit 3, a filtering unit 4 and a gas valve unit 5. The cleaning liquid unit 1 comprises a liquid storage tank 11. The four-way reversing valve 2 has a high-pressure interface 21, a low-pressure interface 22, a liquid inlet interface 23 and a liquid outlet interface 24. The high-pressure interface 21 and the low-pressure interface 22 are respectively connected with high-pressure pipes and low-pressure pipes of a heat pump air conditioning system to be cleaned. The liquid outlet interface 24 is connected with the liquid storage tank 11. The pressurizing unit 3 comprises a water pump 31. The inlet end of the water pump 31 is connected with the liquid storage tank 11. The outlet end of the water pump 31 is connected with the liquid inlet interface 23 of the four-way reversing valve 2. The filtering unit 4 comprises a first filter 41. The inlet of the first filter 41 is connected with the liquid outlet interface 24 of the four-way reversing valve 2. The outlet of the first filter 41 is connected with the liquid storage tank 11. The gas valve unit 5 comprises a first gas valve 51 and a second gas valve 52. The pressurizing unit 3 comprises a gas pump 32. One end of the first gas valve 51 is connected with a pipeline between the water pump 31 and the four-way reversing valve 2. The other end of the first gas valve 51 is connected with the gas pump 32. The two ends of the second gas valve 52 are respectively connected with the outlet of the first filter 41 and the liquid storage tank 11. A valve capable of realizing pipeline closure is arranged between the outlet of the first filter 41 and the liquid storage tank 11. The valve capable of realizing pipeline closure is connected with the second gas valve 52 in parallel.

[0025] The new energy vehicle heat pump air conditioning system cleaning device is characterized in that, after cleaning and discharging cleaning liquid, the pressure regulating valve 6 is closed, the second gas valve 52 is kept in a closed state, the gas pump 32 is started and the first gas valve 51 is opened, residual cleaning liquid in the pipeline is pushed out of the air conditioning system with the increase of pressure, the second gas valve 52 is opened instantaneously after a certain period of time, the pipeline is suddenly depressurized, and the gas flow drives the cleaning liquid to be quickly flushed out. In this way, the problem that water or other liquid will inevitably mix with a part of the contaminated cleaning liquid when the water or other liquid is used to flush the residual cleaning liquid, so that the pipeline is difficult to be relatively completely cleaned, is avoided. In addition, due to the complexity of the new energy vehicle heat pump air conditioning system pipeline, the pressurized gas flow can effectively shuttle in the pipeline, so that the effect similar to liquid flushing is achieved. It is worth noting that the valve capable of realizing pipeline closure plays an important role in the scheme. The valve capable of realizing pipeline closure can completely close the liquid flow channel, so that the gas storage pipeline is formed between the first gas valve 51 and the second gas valve 52, and the above-mentioned pressurized blowing function is realized.

[0026] The bottom of the liquid storage tank 11 is connected with a waste liquid tank 14. A liquid discharge electromagnetic valve 15 is arranged between the bottom of the liquid storage tank 11 and the waste liquid tank 14. The liquid discharge electromagnetic valve 15 is not opened in the cleaning liquid circulation cleaning step and is kept in an open state after cleaning, so as to facilitate the discharge of waste liquid and high-pressure gas.

[0027] In the embodiment, the filtering unit 4 further comprises a second filter 42, the second filter 42 is arranged at the center of the liquid storage tank 11, a filtering area 43 is formed in the second filter 42, a second air valve 52 is in communication with the filtering area 44 of the liquid storage tank 11, and the inlet end of the water pump 31 is in communication with the filtering area 43. After the impurities are filtered by the first filter 41, a small amount of impurities will still be circulated to the liquid storage tank 11, and if the water pump 31 sucks the cleaning liquid containing impurities in the liquid storage tank 11 at this time, the pump body will be damaged. The second filter 42 is arranged in the liquid storage tank 11 to block the impurities again, effectively reduce the impurities in the cleaning liquid, and improve the operation stability of the high-pressure water pump 31. More importantly, such a design can make full use of the kinetic energy of the pressure accumulation and blowing, so that the residual liquid blown out can stir the cleaning liquid to generate the required turbulent flow and vortex for filtering, and the second filter 42 arranged in the liquid storage tank 11 connected with the second air valve 52 can achieve good filtering effect.

[0028] Preferably, the new energy vehicle heat pump air conditioning system cleaning device further comprises an external hanging unit (not shown in the figure), the external hanging unit is connected with the mode switching control system of the heat pump air conditioning system to be cleaned, and the external hanging unit can adjust the communication state of the pipeline of the heat pump air conditioning system to be cleaned to various actual working conditions. Due to the complexity of the pipeline of the new energy vehicle heat pump air conditioning system, if all the pipeline valves are opened at the same time, the pipeline will form a network shape, which will not only cause the cleaning dead angle of the cleaning liquid, but also the pressure accumulation and blowing effect will be greatly reduced due to the complexity of the pipeline. Therefore, the external hanging unit is used to control the pipeline to simulate different communication states of actual working conditions, which can effectively improve the cleaning effect although multiple cleaning is required.

[0029] In the embodiment, the water pump 31 is a high-pressure piston pump, and the liquid storage tank 11 is further provided with an automatic exhaust valve 12. In the embodiment, the valve capable of realizing pipeline closure is a pressure regulating valve 6. Since the high-pressure piston pump will form a high-frequency pulse water flow, if there is air in the cleaning circuit, the air in the pipeline will form a spring effect to offset the kinetic energy of the water flow. Therefore, the automatic exhaust valve 12 is specially arranged on the liquid storage tank 11, so that the liquid storage tank 11 can be filled with cleaning liquid to avoid air residue. The pressure regulating valve 6 can adjust the cleaning pressure of the cleaning liquid according to the pollution state of the heat pump air conditioning system to be cleaned, fully play the role of the high-pressure piston pump, and also realize the pipeline closure.

[0030] In addition, the new energy vehicle heat pump air conditioning system cleaning device further comprises a flow meter 7 and liquid supply barrels 8, the liquid supply barrels 8 are at least two, any one of the liquid supply barrels 8 is provided with an independent liquid suction device 81, the flow meter 7 is arranged between the pressure regulating valve 6 and the liquid storage tank 11, and the liquid outlet end of the liquid suction device 81 is connected between the flow meter 7 and the pressure regulating valve 6. By adopting such a design, the cleaning device can automatically add liquid of different stages and various cleaning agents through multiple sets of liquid supply barrels 8 and liquid washing devices, and the flow meter 7 can simultaneously have two functions: on the one hand, the flow meter 7 can accurately display and control the liquid adding amount of the cleaning device, and on the other hand, the flow in the cleaning circuit can reflect the pipeline blockage or cleaning state in the cleaning state.

[0031] The new energy vehicle heat pump air conditioning system cleaning device further comprises a pressure measuring unit 9, the pressure measuring unit 9 comprises a first pressure sensor 91, a second pressure sensor 92 and a third pressure sensor 93, the first pressure sensor 91 and the second pressure sensor 92 are arranged at the liquid inlet interface 23 and the liquid outlet interface 24 of the four-way reversing valve 2 respectively, and the third pressure sensor 93 is installed at the outlet of the first filter 41. The first pressure sensor 91 controls the output pressure of the water pump 31 on the one hand, and the pressure difference between the first pressure sensor 91 and the second pressure sensor 92 reflects the blockage or pollution of the air conditioning system to be cleaned, so that the cleaning device can flexibly reverse the cleaning according to the setting (the reverse cleaning can achieve certain effect when blocked). The pressure difference between the second pressure sensor 92 and the third sensor can reflect the pollution state of the first filter 41, and the user can be reminded to replace the first filter 41 in time.

[0032] Meanwhile, a pipeline directly connected to the liquid storage tank 11 is arranged between the first gas valve 51 and the first pressure sensor 91, and a safety valve 13 is arranged on the pipeline, for emergency pressure relief inside the pipeline, when the pressure in the pipeline is higher than 2Mpa, the safety valve is opened to relieve pressure to the liquid storage tank 11, to prevent damage to the automobile refrigerant pipeline caused by high pressure.

[0033] The application further provides a new energy vehicle heat pump air conditioning system cleaning process, which utilizes the new energy vehicle heat pump air conditioning system cleaning device to clean the new energy vehicle heat pump air conditioning system, and comprises the following steps:

[0034] Device connection: the high-pressure interface 21 and the low-pressure interface 22 of the cleaning device are connected to the high-pressure pipe and the low-pressure pipe of the heat pump air conditioning system to be cleaned respectively.

[0035] Bidirectional cleaning: clean cleaning fluid is injected into the storage tank 11, the water pump 31 is started to drive the cleaning fluid from the storage tank 11 through the four-way reversing valve 2 along the high-pressure pipe or the low-pressure pipe into the heat pump air conditioning system to be cleaned, and then flows out through the low-pressure pipe or the high-pressure pipe, and then the cleaning fluid returns to the storage tank 11 through the first filter 41. After a certain number of cycles, the four-way reversing valve 2 is reversed to make the cleaning fluid flow in the opposite direction in the heat pump air conditioning system to be cleaned, and the same cycle is repeated. Among them, the pipeline communication state of the heat pump air conditioning system to be cleaned is adjusted to various actual working conditions to clean the pipeline communication state respectively.

[0036] Discharge of waste liquid: close the water pump 31, and discharge the contaminated cleaning fluid in the storage tank 11.

[0037] Pressure accumulation blow cleaning: close the pressure regulating valve 6 and the second air valve 52, open the air pump 32 and the first air valve 51, and after the air pressure rises, open the second air valve 52 to instantaneously blow out the liquid remaining in the pipeline, and then close the air pump 32. Among them, the pipeline communication state of the heat pump air conditioning system to be cleaned is adjusted to various actual working conditions to blow clean the pipeline communication state respectively.

[0038] Circulating cleaning: repeat the bidirectional cleaning and waste liquid discharge steps at least once, and perform pressure accumulation blow cleaning. In this embodiment, the circulating cleaning step repeats the bidirectional cleaning and waste liquid discharge steps twice, that is, the bidirectional cleaning and waste liquid discharge steps are performed three times. The cleaning fluids used in the three times are strong solubility cleaning fluid, weak solubility cleaning fluid and volatile cleaning fluid respectively. The strong solubility cleaning fluid and the weak solubility cleaning fluid can be used for rough cleaning and fine cleaning respectively, and the volatile cleaning fluid can dissolve the previously remaining cleaning fluid to ensure the cleanliness of the pipeline system and avoid pollution to the refrigerant.

[0039] Pipeline blow drying: open the air pump 32, and use high-pressure air flow to blow dry the pipeline of the heat pump air conditioning system.

[0040] Preferably, the circulating cleaning step repeats the bidirectional cleaning and waste liquid discharge steps twice, that is, the bidirectional cleaning and waste liquid discharge steps are performed three times. The cleaning fluids used in the three times are strong solubility cleaning fluid, weak solubility cleaning fluid and volatile cleaning fluid respectively. The strong solubility cleaning fluid and the weak solubility cleaning fluid can be used for rough cleaning and fine cleaning respectively, and the volatile cleaning fluid can dissolve the previously remaining cleaning fluid to ensure the cleanliness of the pipeline system and avoid pollution to the refrigerant.

[0041] Further, in the bidirectional cleaning step, the pipeline communication state of the heat pump air conditioning system to be cleaned is adjusted to various actual working conditions to clean the pipeline communication state respectively. The opening and closing of the valves in each mode of the heat pump air conditioning system is simulated to accurately clean each line of the super manifold and improve the cleaning effect.

[0042] In addition, in the pressure storage purging step, the to-be-cleaned heat pump air conditioning system pipeline communication state is adjusted to the pipeline communication state under various actual working conditions respectively for purging. The opening and closing of the valve of the heat pump air conditioner under various modes are simulated, each line of the super manifold is accurately purged, and the effect of blow-drying is improved.

[0043] In summary, such a new energy vehicle heat pump air conditioning system cleaning device and cleaning process can efficiently and relatively completely clean the new energy vehicle heat pump air conditioning system, and avoid residual cleaning liquid in the pipeline.

[0044] In summary, the above only describes preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A new energy vehicle heat pump air conditioning system cleaning device, comprising a cleaning liquid unit, the cleaning liquid unit comprising a liquid storage tank; a four-way reversing valve, the four-way reversing valve having a high-pressure interface, a low-pressure interface, a liquid inlet interface, and a liquid outlet interface, the high-pressure interface and the low-pressure interface being respectively connected to a high-pressure pipe and a low-pressure pipe of a heat pump air conditioning system to be cleaned, and the liquid outlet interface being connected to the liquid storage tank; a pressurizing unit, the pressurizing unit comprising a water pump, an inlet end of the water pump being connected to the liquid storage tank, and an outlet end of the water pump being connected to the liquid inlet interface of the four-way reversing valve; a filtering unit, the filtering unit comprising a first filter, an inlet of the first filter being connected to the liquid outlet interface of the four-way reversing valve, and an outlet of the first filter being connected to the liquid storage tank; characterized in that the device further comprises a gas valve unit, the gas valve unit comprising a first gas valve and a second gas valve, the pressurizing unit comprising a gas pump, one end of the first gas valve being in communication with a pipeline between the water pump and the four-way reversing valve, the other end of the first gas valve being connected to the gas pump, and two ends of the second gas valve being respectively in communication with the outlet of the first filter and the liquid storage tank; a valve capable of achieving pipeline closure is further arranged between the outlet of the first filter and the liquid storage tank, and the valve capable of achieving pipeline closure is connected in parallel with the second gas valve.

2. The new energy vehicle heat pump air conditioning system cleaning device according to claim 1, characterized in that: the filtering unit further comprises a second filter, the second filter being arranged at the center of the liquid storage tank, a filtering area being formed in the second filter, a to-be-filtered area being formed between the second filter and the liquid storage tank, the second gas valve being in communication with the to-be-filtered area of the liquid storage tank, and an inlet end of the water pump being in communication with the filtering area.

3. The new energy vehicle heat pump air conditioning system cleaning device according to claim 2, characterized in that: the device further comprises an external hanging unit, the external hanging unit being connected to a mode switching control system of the heat pump air conditioning system to be cleaned, and the external hanging unit being capable of adjusting a pipeline communication state of the heat pump air conditioning system to be cleaned to various actual working conditions.

4. The new energy vehicle heat pump air conditioning system cleaning device according to claim 3, characterized in that: the water pump is a high-pressure plunger pump, an automatic exhaust valve is further arranged on the liquid storage tank, and the valve capable of achieving pipeline closure is a pressure regulating valve.

5. The new energy vehicle heat pump air conditioning system cleaning device according to claim 4, characterized in that: the device further comprises a flow meter and liquid supply barrels, at least two liquid supply barrels are provided, any one of the liquid supply barrels is provided with an independent liquid suction device, the flow meter is arranged between the pressure regulating valve and the liquid storage tank, and a liquid outlet end of the liquid suction device is connected between the flow meter and the pressure regulating valve.

6. The new energy vehicle heat pump air conditioning system cleaning device according to claim 1, characterized in that: the device further comprises a pressure measuring unit, the pressure measuring unit comprising a first pressure sensor, a second pressure sensor, and a third pressure sensor, the first pressure sensor and the second pressure sensor being respectively arranged at the liquid inlet interface and the liquid outlet interface of the four-way reversing valve, and the third pressure sensor being arranged at the outlet of the first filter.

7. A new energy vehicle heat pump air conditioning system cleaning process according to claim 1, the new energy vehicle heat pump air conditioning system being cleaned by using the new energy vehicle heat pump air conditioning system cleaning device according to any one of claims 1 to 6, the cleaning process comprising the following steps: device connection: connecting the high-pressure interface and the low-pressure interface of the cleaning device to the high-pressure pipe and the low-pressure pipe of the heat pump air conditioning system to be cleaned, respectively; Bidirectional cleaning: inject clean cleaning liquid into the liquid tank, start the water pump to drive the cleaning liquid from the liquid tank through the four-way reversing valve along the high-pressure pipe or the low-pressure pipe into the heat pump air conditioning system to be cleaned, then flow out through the low-pressure pipe or the high-pressure pipe, and then the cleaning liquid returns to the liquid tank through the first filter; after a certain number of cycles, the four-way reversing valve is reversed to make the cleaning liquid flow in the opposite direction in the heat pump air conditioning system to be cleaned, and the same cycle is repeated for a certain number of times; Discharge of waste liquid: close the water pump and discharge the contaminated cleaning liquid in the liquid tank; Circulating cleaning: repeat the bidirectional cleaning and waste liquid discharge steps at least once; Pipe drying: open the air pump and use high-pressure gas flow to dry the pipes of the heat pump air conditioning system; Its characteristics are: It also includes pressure accumulation and blowing: after the waste liquid discharge step, close the valve that can achieve pipe closure and the second air valve, open the air pump and the first air valve, and after the air pressure rises, open the second air valve to instantly blow out the liquid remaining in the pipe, and then close the air pump. After the circulating cleaning step, the pressure accumulation and blowing step is performed each time. 8.The new energy vehicle heat pump air conditioning system cleaning process according to claim 7, characterized in that: The circulating cleaning step repeats the bidirectional cleaning and waste liquid discharge steps twice, i.e., a total of three bidirectional cleaning and waste liquid discharge steps, and the cleaning liquids used in the three steps are strong solubility cleaning liquid, weak solubility cleaning liquid, and volatile cleaning liquid, respectively. 9.The new energy vehicle heat pump air conditioning system cleaning process according to claim 8, characterized in that: In the bidirectional cleaning step, the pipe connection state of the heat pump air conditioning system to be cleaned is adjusted to various actual working conditions to perform cleaning. 10.The new energy vehicle heat pump air conditioning system cleaning process of claim 9, wherein: In the pressure accumulation and blowing step, the pipe connection state of the heat pump air conditioning system to be cleaned is adjusted to various actual working conditions to perform blowing.

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