Charging gun line heat exchange system

Abstract

The application provides a charging gun line heat exchange system, which has a refrigeration mode and a natural cooling mode. In the refrigeration mode, the flow path switching device is connected with a main path and a first branch path, the flow path switching device is connected with a second branch path and a third branch path, a refrigeration circuit is used to circulate refrigerant, the refrigerant in a second heat exchange part cools a cooling liquid in a first heat exchange part, and a fourth heat exchanger cools a charging gun line unit. In the natural cooling mode, the flow path switching device is connected with the main path and the third branch path, the main path and the third branch path are used to circulate the cooling liquid, the third heat exchanger releases heat to an external environment, and the fourth heat exchanger cools the charging gun line unit. The charging gun line heat exchange system provided by the application can selectively adopt the natural cooling and compression refrigeration or the combination of the two to dissipate heat of the charging gun line, so that the heat dissipation effect is ensured and the energy efficiency ratio is high.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of charging pile heat exchange, and in particular to a charging gun wire heat exchange system. BACKGROUND

[0002] Charging piles, as basic supporting facilities of new energy vehicles, are indispensable in the development process of new energy vehicles. Charging piles are divided into alternating current charging piles and direct current charging piles. The alternating current charging pile is commonly known as "slow charging", which cannot directly charge the automobile power battery and needs to be connected with the vehicle-mounted charger to charge the automobile. The advantage of the alternating current charging pile lies in simple structure, small size and low cost, but the charging power is small and the charging is slow. The direct current charging pile is commonly known as "fast charging", which can directly charge the automobile power battery. The advantage of the direct current charging pile lies in large charging power and fast charging. Therefore, the advantage of fast charging makes the direct current charging pile more and more popular. However, the greater the charging power and voltage and current are, the greater the heat generated by the charging gun wire cable is. If the heat of the charging gun wire cable cannot be dissipated in time and effectively, the normal charging work of the charging gun will be affected.

[0003] In the related art, the heat dissipation system of the charging gun wire adopts a single refrigeration heat dissipation mode, and the energy efficiency is low. Therefore, it is necessary to propose an improved charging gun wire heat exchange system. SUMMARY

[0004] The application provides a charging gun wire heat exchange system with high energy efficiency.

[0005] The application provides a charging gun wire heat exchange system for heat exchange with a charging gun wire unit. The charging gun wire heat exchange system comprises a refrigeration circuit, a main circuit, a first branch circuit and a third branch circuit.

[0006] The charging gun wire heat exchange system comprises a first heat exchanger and a flow path switching device. The first heat exchanger comprises a first heat exchange part and a second heat exchange part. The flow path switching device is connected with the main circuit, the first branch circuit and the third branch circuit respectively.

[0007] The refrigeration circuit comprises a compressor, a second heat exchanger, a throttling device and the second heat exchange part. The main circuit comprises a first liquid pump and a fourth heat exchanger. The first branch circuit comprises the first heat exchange part. The third branch circuit comprises a third heat exchanger. The second heat exchanger comprises a third heat exchange part and a fourth heat exchange part. The charging gun wire heat exchange system comprises a second branch circuit. The second branch circuit comprises a second liquid pump and the fourth heat exchange part. The refrigeration circuit comprises the third heat exchange part. The second branch circuit is connected with the flow path switching device.

[0008] The charging gun line heat exchange system has a refrigeration mode and a natural cooling mode; in the refrigeration mode, the flow path switching device communicates the main path and the first branch path, the flow path switching device communicates the second branch path and the third branch path, the refrigeration circuit flows through refrigerant, the refrigerant in the second heat exchange part cools the cooling liquid of the first heat exchange part, the fourth heat exchanger cools the charging gun line unit, the second branch path and the third branch path flow through the cooling liquid, the third heat exchanger exchanges heat with the external environment, and the cooling liquid in the fourth heat exchange part cools the refrigerant of the third heat exchange part; in the natural cooling mode, the flow path switching device communicates the main path and the third branch path, the main path and the third branch path flow through the cooling liquid, the third heat exchanger releases heat to the external environment, and the fourth heat exchanger cools the charging gun line unit.

[0009] The charging gun line heat exchange system provided by the application comprises a refrigeration circuit main path, a first branch path, a third branch path and a flow path switching device, the main path and the first branch path and the third branch path are communicated through the flow path switching device, so that the natural cooling and compression refrigeration or the combination of the two can be selectively used to dissipate heat of the charging gun line, and the high energy efficiency ratio is ensured while the heat dissipation effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a charging gun line heat exchange system schematic diagram of the application in the refrigeration mode of an eight-way valve;

[0011] Figure 2 is a charging gun line heat exchange system schematic diagram of the application in the natural cooling mode of an eight-way valve; Figure 1

[0012] Figure 3 is another charging gun line heat exchange system schematic diagram of the application in the refrigeration mode of a nine-way valve;

[0013] Figure 4 is a charging gun line heat exchange system schematic diagram of the application in the natural cooling mode of a nine-way valve; Figure 3

[0014] Figure 5 is another charging gun line heat exchange system schematic diagram of the application in the refrigeration mode of two four-way valves;

[0015] Figure 6 is a charging gun line heat exchange system schematic diagram of the application in the refrigeration mode of two four-way valves; Figure 5

[0016] Figure 7 is another charging gun line heat exchange system schematic diagram of the application in the refrigeration mode of one four-way valve;

[0017] Figure 8 is a charging gun line heat exchange system schematic diagram of the application in the refrigeration mode of one four-way valve; Figure 7 ​​​The schematic diagram of the charging gun line heat exchange system using a four-way valve natural cooling mode is shown in the figure.

[0018] Figure 9 The schematic diagram of another charging gun line heat exchange system of the application using a three-way valve refrigeration mode and a natural cooling mode is shown in the figure.

[0019] Figure 10 The schematic diagram of another charging gun line heat exchange system of the application using a two-way valve refrigeration mode and a natural cooling mode is shown in the figure.

[0020] Figure 11 The schematic diagram of another charging gun line heat exchange system is shown in the figure. Figure 1 The schematic diagram of another charging gun line heat exchange system is shown in the figure.

[0021] In the figure: main road 1, first branch 2, second branch 3, third branch 4, refrigeration circuit 5, charging terminal 6, charging gun line unit 7, fourth heat exchanger 8, fifth electromagnetic valve 9, three-way flow valve 10, first pressure sensor 11, second temperature sensor 12, third liquid pump 13, heating unit 14, second pressure sensor 16, liquid level meter 17, pressure relief valve 18, water tank 19, Y-type filter 20, first liquid pump 21, first temperature sensor 22, eight-way valve 23, first valve port 24, second valve port 25, third valve port 26, fourth valve port 27, sixth valve port 28, seventh valve port 29, eighth valve port 30, second liquid pump 31, second needle valve 32, suction pressure sensor 33, compressor 34, discharge pressure sensor 35, first needle valve 36, first heat exchange part 37, second heat exchange part 38, third heat exchange part 39, fourth heat exchange part 40, third temperature sensor 41, fourth temperature sensor 42, drying filter 43, throttling device 44, fourth branch 45, third heat exchanger 46, fan 47, ambient temperature sensor 48, fifth valve port 50, nine-way valve 51, four-way valve 52, three-way valve group 53, second electromagnetic valve 55, first electromagnetic valve 56, fourth electromagnetic valve 57, third electromagnetic valve 58, control unit 60, first connection port 61, second connection port 62, third connection port 63, fourth connection port 64, second heat exchanger 65. DETAILED DESCRIPTION

[0022] The following description is provided to enable any person skilled in the art to practice the application. The preferred embodiments in the following description are only examples of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The basic principles defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the application. All technical solutions and improvements without departing from the spirit and scope of the application shall be covered within the scope of the claims of the application.

[0023] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0024] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0025] Hereinafter, the present application will be described with reference to all or part of Figures 1 to 11 .

[0026] As Figures 1 to 10As shown, the embodiment provides a charging gun line heat exchange system for heat exchange of at least one charging gun line unit 7 of at least one charging pile. The charging pile is an essential supporting facility for new energy vehicles and is indispensable in the development process of new energy vehicles. The charging gun is an essential part of the charging pile. The fourth heat exchanger 8 is arranged in the charging gun line unit 7. The fourth heat exchanger 8 can adopt a liquid cooling plate, etc. The charging gun line unit 7 includes a charging module, a charging cable, and a liquid pipe. The fourth heat exchanger 8 is configured to dissipate heat for the charging module. The charging module is connected with the charging cable. The fourth heat exchanger 8 is connected with the charging gun line heat exchange system through the liquid pipe. The liquid pipe is in contact with the charging cable for heat exchange. The liquid pipe and the charging cable together form the charging gun line. The charging pile is divided into two types: alternating current charging pile and direct current charging pile. The alternating current charging pile is commonly known as "slow charging". It cannot directly charge the power battery of the vehicle and needs to be connected with the vehicle-mounted charger to charge the new energy vehicle. The advantage of the alternating current charging pile is simple structure and small size, but the defect is obvious, that is, the charging power is small and the charging is slow. Small charging power can make the charging gun line dissipate heat in time and has good safety. Therefore, the alternating current charging pile is usually installed in urban public parking lots, shopping malls, and residential areas. The direct current charging pile is commonly known as "fast charging" and can directly charge the power battery of the new energy vehicle. Its advantage is large charging power and fast charging, but the defect is high cost and large voltage and current. Due to the large voltage and current, the heat generation of the charging gun cable is also large. If the heat cannot be dissipated in time, it will affect the normal work of the charging gun. Therefore, in order to ensure that the charging gun cable will not fail due to overheating during charging, a heat exchange system needs to be configured for heat dissipation. However, the energy efficiency is low when heat dissipation is performed by a single refrigeration mode, which cannot meet the energy saving requirement. Therefore, a charging gun line heat exchange system with both refrigeration mode and natural cooling mode is provided to improve energy efficiency and meet the energy saving and heat dissipation effect. The charging gun line heat exchange system includes a refrigeration circuit 5, a main circuit 1, a first branch circuit 2, and a third branch circuit 4. The charging gun line heat exchange system includes a first heat exchanger and a flow path switching device. The first heat exchanger is a double-flow heat exchanger, which is an evaporator in this embodiment. The first heat exchanger includes a first heat exchange part 37 and a second heat exchange part 38. The flow path switching device is connected with the main circuit 1, the first branch circuit 2, and the third branch circuit 4, respectively. In this embodiment, the flow path switching device is electrically connected with a control unit 60 in the charging gun line heat exchange system. The pipe direction in the flow path switching device is switched by the control unit 60 to change the flow direction of the cooling liquid in the pipe.Refrigeration circuit 5 includes a compressor 34, a second heat exchange section 38, a throttling device 44, and a second heat exchanger 65. The main circuit includes a first liquid pump 21 and a fourth heat exchanger 8. The first branch circuit 2 includes a first heat exchange section 37, and the third branch circuit 4 includes a third heat exchanger 46. In this embodiment, the third heat exchanger 46 is an air cooler. The main circuit 1, the first branch circuit 2, and the third branch circuit 4 are used for circulating coolant, and the refrigeration circuit 5 is used for circulating refrigerant. Therefore, coolant flows through the first heat exchange section 37 and the third heat exchanger 46, and refrigerant flows through the second heat exchange section 38. The electric gun wire heat exchange system has a cooling mode and an air-cooling mode. The air-cooling mode can also be called the natural cooling mode, which utilizes the cooling capacity of the air in the natural environment for heat exchange. In the cooling mode, the flow path switching device connects the main path 1 and the first branch path 2. The refrigerant flows through the cooling circuit 5. The coolant flowing out of the main path 1 flows into the first branch path 2. When it flows through the first heat exchange section 37, the refrigerant in the second heat exchange section 38 cools the coolant in the first heat exchange section 37. The cooled coolant after heat exchange flows to the fourth heat exchanger 8. The fourth heat exchanger 8 cools the charging gun wire unit 7. Under this scheme, for example... Figure 11 As shown, considering that the refrigerant discharged from the compressor undergoes phase change and releases heat as it flows through the second heat exchanger 65, the temperature of the second heat exchanger 65 is relatively high at this time. If the second heat exchanger 65 is not cooled in time, it will affect the refrigerant's performance. Therefore, multiple methods are used to cool the second heat exchanger 65. For example, a fan can be added next to the second heat exchanger 65 to cool it. Of course, the scheme in this embodiment can also be used. The charging gun heat exchange system also includes a second branch 3. The second heat exchanger 65 also adopts a dual-channel heat exchanger. The second heat exchanger 65 is a condenser and includes a third heat exchange section 39 and a fourth heat exchange section 40. The second branch 3 includes a second liquid pump 31 and a fourth heat exchange section 40. The refrigeration circuit 5 includes a third heat exchange section 39. The second branch 3 is connected to a flow path switching device. In the refrigeration mode, the flow path switching device connects the second branch 3 and the third branch 4. Coolant flows through the second branch 3 and the third branch 4. The three heat exchangers 46 exchange heat with the external environment, and the coolant in the fourth heat exchange section 40 cools the refrigerant in the third heat exchange section 39. In the natural cooling mode, the compressor 34 does not work, the flow path switching device connects the main path 1 and the third branch path 4, the main path 1 and the third branch path 4 flow with coolant, the third heat exchanger 46 releases heat to the external environment, and the fourth heat exchanger 8 cools the charging gun line unit 7. In addition, in this embodiment, in the natural cooling mode, the flow path switching device connects the first branch path 2 and the second branch path 3, but since the compressor 34 does not work and does not generate heat, the first branch path 2 and the second branch path 3 also do not need to work. Therefore, the charging gun line heat exchange system of this embodiment can selectively use natural cooling and compression refrigeration or a combination of both to dissipate heat from the charging gun line during use. Furthermore, in this embodiment, the compressor 34 is a variable frequency compressor, and the operation of the compressor 34 can be adjusted according to the actual load of the multiple charging gun line units 7.

[0027] In actual use, when in a suitable or low temperature weather environment, such as winter, spring and autumn, the charging gun line heat exchange system can select natural cooling (air cooling) mode as the single or main heat dissipation mode, and the compressor 34 is not started at this time, so that the energy consumption can be reduced; when in a high temperature weather environment, such as summer, the charging gun line heat exchange system can select the compressor 34 refrigeration mode as the single or main heat dissipation mode; therefore, the charging gun line heat exchange system provided by the embodiment can selectively adopt natural cooling and compression refrigeration or a combination of both to dissipate heat of the charging gun line, so as to ensure the heat dissipation effect while having a high energy efficiency ratio.

[0028] In the above embodiment, the cooling liquid is mixed by ethylene glycol and water in a certain proportion, for example, ethylene glycol and water are mixed in a ratio of 1:1. Of course, in other embodiments, other cooling liquids such as cooling oil can also be used. When the season changes and the environmental temperature changes greatly, the density of the cooling liquid will also change, causing the volume to expand and shrink. In order to solve the above problems, in the embodiment, the main circuit 1 further comprises a liquid supplementing and discharging device, the liquid supplementing and discharging device, the fourth heat exchanger 8 and the first liquid pump 21 are connected in series and located between the first liquid pump 21 and the fourth heat exchanger 8. The liquid supplementing and discharging device comprises a water tank 19, a pressure relief valve 18 arranged in the water tank 19 and a liquid level meter 17 located at least partially in the water tank 19. The liquid level meter 17 is electrically connected with the control unit 60. The liquid outlet end of the water tank 19 is connected with the inlet end of the first liquid pump 21, and the liquid inlet end of the water tank 19 is connected with the liquid outlet end of the fourth heat exchanger 8. The connection includes direct connection and indirect connection. The direct connection is that the liquid outlet end pipeline of the water tank 19 is directly communicated with the inlet end pipeline of the first liquid pump 21. The indirect connection is that the liquid outlet end pipeline of the water tank 19 is indirectly communicated with the inlet end pipeline of the first liquid pump 21 through an adapter pipeline. When the volume of the cooling liquid expands, the excess cooling liquid in the main circuit 1 returns to the water tank 19 for storage, so that the explosion of components, pipelines and the like caused by the volume expansion of the cooling liquid is avoided, and the safety is improved. When the volume of the cooling liquid shrinks, the cooling liquid in the water tank 19 can be supplemented to the main circuit 1 for work. The liquid level meter 17 is used to monitor the water level in the water tank 19. The liquid level meter 17 feeds back signal data to the control unit 60. The pressure relief valve 18 can discharge air in the pipeline, so that the pressure in the water tank remains constant. In other embodiments, the concentration of the cooling liquid can also be adjusted as needed. In order to prevent the third branch circuit 4 from also needing to supplement or store liquid, a liquid supplementing and discharging device can also be arranged on the third branch circuit 4.

[0029] Further, the liquid supplementing device further comprises a Y-type filter 20, which is located between the water tank 19 and the first liquid pump 21. The Y-type filter 20 can filter out sundries such as metal chips, particulate dust, mixed gas, oxide and the like from the cooling liquid discharged from the water tank 19, so as to prevent the sundries from blocking the pipeline of the heat exchange system. On the other hand, if the cooling liquid is mixed with the sundries, the heat exchange efficiency of the cooling liquid will be affected. Therefore, the Y-type filter 20 can better filter out the sundries mixed in the cooling liquid, so as to optimize the heat exchange effect of the cooling liquid.

[0030] It is worth mentioning that, in the embodiment, the flow path switching device comprises a multi-way valve. Different types and numbers of the multi-way valve can realize different embodiments, as follows.

[0031] Referring to FIG. 1, Figures 1 to 2 As shown in FIG. 1, the multi-way valve comprises eight valve ports. In a first embodiment, the multi-way valve is an eight-way valve 23. That is, an eight-way valve 23 is arranged in the charging gun line heat exchange system. The multi-way valve comprises a first valve port 24, a second valve port 25, a third valve port 26, a fourth valve port 27, a fifth valve port 50, a sixth valve port 28, a seventh valve port 29 and an eighth valve port 30. Since the main path 1, the first branch path 2, the second branch path 3 and the third branch path 4 are all communicated with the eight-way valve 23 and are connected to the corresponding liquid inlet end and liquid outlet end, the main path 1, the first branch path 2, the second branch path 3 and the third branch path 4 can be independent of each other when they are not installed with the eight-way valve 23. The liquid outlet end of the main path 1 is connected to the first valve port 24, the liquid inlet end of the main path 1 is connected to the second valve port 25, the liquid outlet end of the first branch path 2 is connected to the third valve port 26, the liquid inlet end of the first branch path 2 is connected to the fourth valve port 27, the liquid outlet end of the second branch path 3 is connected to the fifth valve port 50, the liquid inlet end of the second branch path 3 is connected to the sixth valve port 28, the liquid outlet end of the third branch path 4 is connected to the seventh valve port 29, and the liquid inlet end of the third branch path 4 is connected to the eighth valve port 30.

[0032] In the refrigeration mode, the first valve port 24 communicates with the fourth valve port 27, the second valve port 25 communicates with the third valve port 26, the fifth valve port 50 communicates with the eighth valve port 30, and the sixth valve port 28 communicates with the seventh valve port 29; Specifically, on the refrigeration circuit 5, the compressor 34 is started, the compressor 34 sucks in low-temperature and low-pressure gaseous refrigerant, and discharges high-temperature and high-pressure gaseous refrigerant after adiabatic compression, and the gaseous refrigerant becomes medium-temperature and high-pressure liquid refrigerant in the third heat exchange part 39 of the second heat exchanger 65 (condenser) and the cooling liquid phase change exothermic located in the fourth heat exchange part 40, and the refrigerant becomes low-temperature and low-pressure gas-liquid two-phase after isenthalpic throttling, and the liquid refrigerant becomes gaseous after absorbing heat in the first heat exchanger (evaporator), and the gaseous refrigerant returns to the compressor 34, and so on, on the main circuit 1 and the first branch circuit 2, the first liquid pump 21 drives the cooling liquid on the main circuit 1 to enter the first branch circuit 2 and flow through the first heat exchange part 37, the cooling liquid releases heat in the first heat exchange part 37 to reduce the temperature, and the low-temperature cooling liquid is transported to different fourth heat exchangers 8 through the third liquid pump 13 on the branch circuit to cool different charging gun line units 7, at the same time, the second branch circuit 3 and the third branch circuit 4 communicate the cooling liquid flow, and the second liquid pump 31 is driven to drive the cooling liquid in the second branch circuit 3;

[0033] The eight-way valve 23 is switched to make the charging gun line heat exchange system in the natural cooling mode, the first valve port 24 communicates with the eighth valve port 30, the second valve port 25 communicates with the seventh valve port 29, the third valve port 26 communicates with the sixth valve port 28, and the fourth valve port 27 communicates with the fifth valve port 50; Specifically, in this mode, the compressor 34 is not started, the first liquid pump 21 drives the cooling liquid to enter the third branch circuit 4, and the cooling liquid flows through the third heat exchanger 46, at this time, the ambient temperature is lower than the cooling liquid temperature, the cooling liquid releases heat to the ambient air, the cooled cooling liquid is transported back to the main circuit 1 through the third liquid pump 13, and is transported to different charging piles to cool the charging gun line unit 7.

[0034] Please refer to Figures 3 to 4 As shown, the multi-way valve includes nine valve ports, and the second embodiment is that the multi-way valve adopts a nine-way valve 51, and the charging gun line heat exchange system is provided with a nine-way valve 51, and the difference between the nine-way valve 51 and the eight-way valve 23 is that one of the valve ports of the nine-way valve 51 includes two inlets or outlets, in this embodiment, the first valve port 24 includes two inlets, and the outlet end of the main circuit 1 can be connected to one of the inlets, and the main circuit 1, the first branch circuit 2, the second branch circuit 3 and the third branch circuit 4 can be independent of each other when they are not installed with the nine-way valve 51, and in this embodiment, the connection relationship of the remaining main circuit 1, the first branch circuit 2, the second branch circuit 3 and the third branch circuit 4 with the nine-way valve 51 and the cooling liquid flow direction in the pipeline can be referred to the eight-way valve 23 and the first embodiment. Figure 3 and Figure 4 .

[0035] Please refer to Figures 5 to 6As shown, the third embodiment is a four-way valve 52, two four-way valves 52 are arranged in the charging gun line heat exchange system, the main path 1, the first branch path 2, the second branch path 3 and the third branch path 4 can be independent of each other when not installed with the eight-way valve 23, the two four-way valves 52 have eight valve ports, i.e. the first valve port 24, the second valve port 25, the third valve port 26, the fourth valve port 27, the fifth valve port 50, the sixth valve port 28, the seventh valve port 29 and the eighth valve port 30, the outlet of the main path 1 is connected with the first valve port 24, the inlet of the main path 1 is connected with the second valve port 25, the outlet of the first branch path 2 is connected with the third valve port 26, the inlet of the first branch path 2 is connected with the fourth valve port 27, the outlet of the second branch path 3 is connected with the fifth valve port 50, the inlet of the second branch path 3 is connected with the sixth valve port 28, the outlet of the third branch path 4 is connected with the seventh valve port 29, and the inlet of the third branch path 4 is connected with the eighth valve port 30, in the refrigeration mode, the first valve port 24 is communicated with the fourth valve port 27, the second valve port 25 is communicated with the third valve port 26, the fifth valve port 50 is communicated with the eighth valve port 30, and the sixth valve port 28 is communicated with the seventh valve port 29; the eight-way valve 23 is switched so that the charging gun line heat exchange system is in the natural cooling mode, the first valve port 24 is communicated with the eighth valve port 30, the second valve port 25 is communicated with the seventh valve port 29, the third valve port 26 is communicated with the sixth valve port 28, and the fourth valve port 27 is communicated with the fifth valve port 50; wherein the flow direction of the refrigerant and the cold carrier can refer to the scheme of the eight-way valve 23, which will not be described in detail here.

[0036] Please refer to Figures 7 to 8 As shown, the fourth embodiment is a four-way valve 52, one four-way valve 52 is arranged in the charging gun line heat exchange system, the four-way valve 52 includes a first connecting port 61, a second connecting port 62, a third connecting port 63 and a fourth connecting port 64, wherein the outlet of the main path 1 is connected with the first connecting port 61, the inlet of the first branch path 2 is connected with the second connecting port 62, the outlet of the second branch path 3 is connected with the third connecting port 63, and the inlet of the third branch path 4 is connected with the fourth connecting port 64, the inlet of the main path 1, the outlet of the first branch path 2, the inlet of the second branch path 3 and the inlet of the third branch path 4 are connected.

[0037] In the refrigeration mode, the first connecting port 61 is communicated with the second connecting port 62, and the third connecting port 63 is communicated with the fourth connecting port 64; in this mode, the compressor 34 and the second liquid pump 31 are both turned on, and the first heat exchanger and the second heat exchanger 65 are in working heat exchange state, since the lower management path is disconnected by the four-way valve 52, the second branch path 3 and the first branch path 2 cannot form a flow loop, the main path 1 and the first branch path 2 flow the cooling liquid, and the second branch path 3 and the third branch path 4 flow the cooling liquid.

[0038] In the air cooling mode (natural cooling mode), the compressor 34 and the second liquid pump 31 do not work, the first connecting port 61 communicates with the fourth connecting port 64, the second connecting port 62 communicates with the third connecting port 63, the cooling liquid in the loop formed by the first branch 2, the second branch 3 and the refrigeration circuit 5 does not flow and there is no heat exchange, the loop formed by the main circuit 1 and the third branch 4 is driven by the first liquid pump 21 and the third liquid pump 13, and the cooling liquid is cooled by the third heat exchanger 46.

[0039] Please refer to Figure 10 As shown in the figure, the fifth embodiment is a multi-way valve using a two-way valve, and the two-way valve is an electromagnetic valve. Four electromagnetic valves are arranged in the charging gun line heat exchange system, which are a first electromagnetic valve 56, a second electromagnetic valve 55, a third electromagnetic valve 58 and a fourth electromagnetic valve 57. In this scheme, the third branch 4 is in series with the main circuit 1, the first branch 2 is in series with the main circuit 1, the second branch 3 is in series with the main circuit 1, the third branch 4, the second branch 3 and the first branch 2 are in parallel, the first port of the first electromagnetic valve 56 is connected to the liquid outlet end of the main circuit 1, and the second port of the first electromagnetic valve 56 is connected to the liquid inlet end of the third branch 4; the first port of the second electromagnetic valve 55 is connected to the liquid outlet end of the main circuit 1, and the first port of the second electromagnetic valve 55 is connected between the first port of the first electromagnetic valve 56 and the liquid outlet end of the main circuit 1, and the second port of the second electromagnetic valve 55 is connected to the liquid inlet end of the first branch 2; the first port of the third electromagnetic valve 58 is connected to the liquid inlet end of the second branch 3, and the second port of the third electromagnetic valve 58 is connected to the liquid outlet end of the third branch 4; the first port of the fourth electromagnetic valve 57 is connected to the liquid inlet end of the main circuit 1, and the second port of the fourth electromagnetic valve 57 is connected to the liquid outlet end of the third branch 4, and the second port of the fourth electromagnetic valve 57 is connected between the liquid outlet end of the third branch 4 and the second port of the third electromagnetic valve 58, the liquid outlet end of the first branch 2 is connected between the first port of the fourth electromagnetic valve 57 and the liquid inlet end of the main circuit 1, and the liquid outlet end of the second branch 3 is connected between the second port of the first electromagnetic valve 56 and the liquid inlet end of the third branch 4; in the refrigeration mode, the second electromagnetic valve 55 and the third electromagnetic valve 58 are opened, and the first electromagnetic valve 56 and the fourth electromagnetic valve 57 are closed, in the natural cooling mode, the first electromagnetic valve 56 and the fourth electromagnetic valve 57 are opened, and the second electromagnetic valve 55 and the third electromagnetic valve 58 are closed, in the two modes, the flow direction of the cooling liquid can refer to the first embodiment, which will not be described in detail here.

[0040] Please refer to Figure 9As shown, the sixth embodiment is a multi-way valve using a three-way valve group, the three-way valve group includes two three-way valves 53, the two three-way valves 53 are arranged in the charging gun line heat exchange system, the three-way valve 53 includes one inlet and two outlets, wherein the connection relationship of the main path 1, the first branch path 2, the second branch path 3 and the third branch path 4 refers to the fifth embodiment, and will not be described again, the liquid inlet end of the main path 1, the liquid outlet end of the third branch path 4 and the liquid inlet end of the second branch path 3 are all connected with one of the three-way valves 53, the liquid outlet end of the main path 1, the liquid inlet end of the third branch path 4 and the liquid inlet end of the first branch path 2 are all connected with the other three-way valve 53, the liquid inlet end of the first branch path 2 is arranged close to the liquid outlet end of the main path 1, the other end of the first branch path 2 is located between the first heat exchange part 37 and the fourth heat exchanger 8, the liquid outlet end of the second branch path 3 is arranged close to the liquid inlet end of the third branch path 4, and the other end of the second branch path 3 is located between the third heat exchanger 46 and the fourth heat exchange part 40; in the two modes, the flow direction of the cooling liquid can refer to the first and fifth embodiments, which will not be described again.

[0041] In the embodiment, the first heat exchanger can use a plate heat exchanger, which can save space and greatly reduce the refrigerant charge; the second heat exchanger 65 can also use a plate heat exchanger, the plate heat exchanger includes a plurality of heat exchange plates stacked, a channel between adjacent plates, one of the channels is used for flowing the cooling liquid (the heat exchange plates on both sides of the channel are combined into the first heat exchange part 37 or the fourth heat exchange part 40), and the other channel is used for flowing the refrigerant (the heat exchange plates on both sides of the channel are combined into the second heat exchange part 38 or the third heat exchange part 39); of course, in other embodiments, the first heat exchanger and the second heat exchanger 65 can use a double-pipe heat exchanger; the third heat exchanger 46 is used for heat exchange between the cooling liquid and the ambient air, in other embodiments, the third heat exchanger 46 can use a micro-channel heat exchanger, which has small volume, small air resistance and high heat exchange efficiency, and can also use a copper tube fin heat exchanger.

[0042] In the above embodiments, please refer to Figures 1 to 10As shown, the charging gun line heat exchange system includes at least one fan 47, the fan 47 is arranged beside the third heat exchanger 46, the fan 47 is used to transport the ambient air flow through the third heat exchanger 46, the fan 47 is electrically connected with the control unit 60, the fan 47 and the ambient air exchange heat with the cooling liquid in the third heat exchanger 46, compared with the heat exchange through the ambient air alone, the heat dissipation effect is further optimized, in other embodiments, the charging gun line heat exchange system includes two fans 47, one fan 47 is arranged beside the third heat exchanger 46, and the other fan 47 is arranged beside the second heat exchanger 65. In addition, in the embodiment, the charging gun line heat exchange system further includes a first temperature sensor 22, the first temperature sensor 22 is arranged close to the outlet of the fourth heat exchanger 8, the first temperature sensor 22 is configured to detect the outlet temperature of the fourth heat exchanger 8, and the first temperature sensor 22 is electrically connected with the control unit 60; the charging gun line heat exchange system further includes a second temperature sensor 12, the second temperature sensor 12 is arranged close to the inlet of the fourth heat exchanger 8, the second temperature sensor 12 is configured to detect the inlet temperature of the fourth heat exchanger 8, and the second temperature sensor 12 is electrically connected with the control unit 60; the rotating speed of the fan 47 is controlled according to different temperature sensors, in the natural cooling mode, the rotating speed of the fan 47 is controlled based on the inlet temperature and the outlet temperature monitored by the first temperature sensor 22 and the second temperature sensor 12, in the embodiment, the second branch 3 includes a third temperature sensor 41 and a fourth temperature sensor 42, the third temperature sensor 41 is arranged at the inlet of the fourth heat exchange part, and the fourth temperature sensor 42 is arranged at the outlet of the fourth heat exchange part, in the refrigeration mode, the rotating speed of the fan 47 is controlled based on the inlet temperature and the outlet temperature monitored by the third temperature sensor 41 and the fourth temperature sensor 42.

[0043] Please refer again to Figures 1 to 10 As shown, in the above embodiment, when a plurality of charging gun line units 7 are arranged, the plurality of charging gun line units 7 constitute the charging terminal 6, the charging gun line units 7 are arranged in parallel, the charging gun line unit 7 includes the fourth heat exchanger 8, the charging gun line heat exchange system further includes a plurality of fifth electromagnetic valves 9, and the fourth heat exchanger 8 is connected with one fifth electromagnetic valve 9 in series; the charging gun line unit 7 further includes a charging cable, and the charging cable is in contact with the liquid pipe; wherein the contact includes direct or indirect contact, the charging cable and the liquid pipe jointly form a charging gun line, the fifth electromagnetic valve 9 is located at the front end of the charging gun line, the fifth electromagnetic valve 9 is electrically connected with the control unit 60, the fifth electromagnetic valve 9 controls the opening or closing of the cooling liquid in this path, when one of the charging guns does not work, the corresponding charging gun line does not need to dissipate heat, the fifth electromagnetic valve 9 in this path is in the closed state, so that the cooling liquid cannot enter this path to dissipate heat, when one of the charging guns works, the corresponding charging gun line needs to dissipate heat, the fifth electromagnetic valve 9 in this path is in the open state, so that the cooling liquid can enter this path to dissipate heat.

[0044] In view of the fact that the environmental temperature change also affects the viscosity of the cooling liquid in the charging gun line heat exchange system, and in the case of low temperature in winter, the viscosity of the cooling liquid becomes higher, and the flowability of the cooling liquid becomes worse, and the flowability of the cooling liquid affects the heat exchange effect, in order to solve the above problems, the flow path can ensure the heat dissipation of the entire heat exchange system even in the case of low environmental temperature, at least the main path 1 further comprises a heating unit 14 and a third liquid pump 13, the heating unit 14, the third liquid pump 13 and the charging terminal 6 are connected in series, the third liquid pump 13 is located between the heating unit 14 and the charging terminal 6, and the heating unit 14 is close to the inlet end of the charging terminal 6; when the heat exchange system is in a cold winter environment, the heating unit 14 starts to preheat or heat the cooling liquid in the flow path in real time to reduce the viscosity of the cooling liquid and ensure the smooth flow of the cooling liquid; the third liquid pump 13 can further ensure the flow of the cooling liquid to the charging gun line and ensure the constant flow in the flow path.

[0045] In addition, considering that not every time multiple charging gun line units 7 need to be cooled, in other words, each charging gun line may need cooling liquid to flow in at different time points for heat dissipation, or only one or two charging gun line units 7 may need to be cooled each time, therefore, based on the above problems, in the present embodiment, a branch path is added in the main path 1 to solve the problem, specifically, the charging gun line heat exchange system further comprises a fourth branch path 45 and a three-way flow valve 10, the three-way flow valve 10 is located between the third liquid pump 13 and the charging terminal 6, the three-way flow valve 10 comprises an inlet and two outlets, the inlet is connected with the third liquid pump 13, one of the two outlets is connected with the liquid inlet end of the fourth branch path 45, and the other is connected with the liquid inlet end of the charging terminal 6; the liquid outlet end of the fourth branch path 45 communicates with the outlet end of the charging terminal 6, the flow distribution ratio of the flow of the two valve outlets is adjusted by controlling the opening of the three-way valve group 53, the three-way flow valve 10 distributes the flow of the cooling liquid flowing into the charging terminal 6, and the excess cooling liquid flows to the fourth branch path 45, for example, when only one charging gun line unit 7 in the charging terminal 6 needs to be cooled, the cooling liquid flows through the three-way flow valve 10, and the cooling liquid flow for cooling one charging gun line flows into the charging terminal 6, and the remaining cooling liquid flow flows into the fourth branch path 45, thereby improving the constant flow of the cooling liquid in the flow path.

[0046] In the embodiment, the refrigeration circuit 5 comprises a throttling device 44 and a drying filter 43, the throttling device 44, the drying filter 43, the second heat exchange part 38 and the third heat exchange part 39 are connected in series, the throttling device 44 is located between the second heat exchange part 38 and the third heat exchange part 39, the drying filter 43 is located between the throttling device 44 and the third heat exchange part 39, and the throttling device 44 is electrically connected with the control unit 60. The compressor 34 is started, the compressor 34 sucks in low-temperature and low-pressure gaseous refrigerant, discharges high-temperature and high-pressure gaseous refrigerant after adiabatic compression, and the gaseous refrigerant exchanges heat in the third heat exchange part 39 to become medium-temperature and high-pressure liquid refrigerant. The high-pressure refrigerant liquid is injected into the second heat exchange part 38 after being throttled and decompressed by the throttling device 44. The throttling device 44 can be one of throttling elements such as a capillary, a thermal expansion valve and an electronic expansion valve, and the throttling device 44 is preferably an electronic expansion valve. The drying filter 43 can filter out impurities such as dust, various oxides and metal shavings in the refrigerant, so as to prevent the impurities from blocking the capillary in the refrigeration system or damaging the compressor 34. On the other hand, if the refrigerant is mixed with impurities, the heat exchange effect will be affected. In addition, the drying filter 43 can also absorb the residual moisture in the refrigeration system to prevent ice blockage and reduce the corrosion of moisture to the refrigeration system.

[0047] In the above embodiment, the refrigeration circuit 5 further comprises an exhaust pressure sensor 35 and an intake pressure sensor 33, the exhaust pressure sensor 35 and the intake pressure sensor 33 are connected in series with the compressor 34, the exhaust pressure sensor 35 is arranged between the outlet end of the compressor 34 and the third heat exchange part 39, the intake pressure sensor 33 is arranged between the inlet end of the compressor 34 and the second heat exchange part 38, the exhaust pressure sensor 35 is used for monitoring the exhaust pressure of the compressor 34, the intake pressure sensor 33 is used for monitoring the intake pressure of the compressor 34, and the exhaust pressure sensor 35 and the intake pressure sensor 33 are electrically connected with the control unit 60. When the third heat exchange part 39 is seriously dirty and blocked, the refrigerant is excessive, air or other non-condensed gas is mixed in the system, the exhaust pressure is too high, the working efficiency is reduced, and the compressor 34 is even damaged. When the exhaust pressure sensor 35 monitors that the exhaust pressure is too high, the control unit 60 controls the compressor 34 to stop working according to the signal of the too-high exhaust pressure, so as to play a protection role. Similarly, the intake pressure sensor 33 monitors the intake pressure of the compressor 34.

[0048] In the above embodiment, the refrigeration circuit 5 further comprises a first needle valve 36 and a second needle valve 32, the first needle valve 36 and the second needle valve 32 are connected in series with the compressor 34, the first needle valve 36 is arranged between the exhaust pressure sensor 35 and the third heat exchange part 39, the second needle valve 32 is arranged between the intake pressure sensor 33 and the second heat exchange part 38, and the first needle valve 36 and the second needle valve 32 are used for refrigerant charging.

[0049] In the embodiment, the main circuit 1 further comprises a first pressure sensor 11 and a second pressure sensor 16, the first pressure sensor 11 is arranged between the second temperature sensor 12 and the three-way flow regulating valve, the second pressure sensor 16 is arranged between the water tank 19 and the charging terminal 6, the first pressure sensor 11 and the second pressure sensor 16 are electrically connected with the control unit 60, the first pressure sensor 11 and the second pressure sensor 16 are used for monitoring the running state of the main circuit 1, and if the liquid pump is blocked or the pressure of the main circuit 1 is abnormal, an alarm can be monitored and given.

[0050] The charging gun line heat exchange system provided in the embodiment adopts the combination of air cooling (natural cooling) and compressor 34 circulating refrigeration to dissipate heat of the plurality of charging gun lines of the plurality of charging piles, can effectively utilize the environmental cold source, is relatively energy-saving in spring, autumn and winter, has better heat dissipation effect in combination with the refrigeration mode in the weather with higher temperature, compared with the single refrigeration heat exchange mode, the dual mode can save energy more, in the embodiment, the charging gun line heat exchange system further comprises an ambient temperature sensor 48, the ambient temperature sensor 48 is used for monitoring the outdoor ambient temperature, the ambient temperature sensor 48 is electrically connected with the control unit 60, when the ambient temperature is low, the compressor 34 does not need to be started, and even the fan 47 does not need to be started, so that the heat dissipation effect is guaranteed and the energy-saving effect is achieved, and the energy efficiency ratio is higher.

[0051] Those skilled in the art should understand that the embodiments of the application shown in the above description and the drawings are only examples and do not limit the application.

[0052] The purpose of the application has been completely and effectively achieved. The function and structural principle of the application have been shown and explained in the embodiments, and the embodiments of the application can be any modification or change without departing from the principle.

Claims

1. A charging gun wire heat exchange system, used for heat exchange with a charging gun wire unit, characterized in that, The charging gun wire heat exchange system includes a cooling circuit, a main circuit, a first branch circuit, and a third branch circuit; The charging gun line heat exchange system includes a first heat exchanger and a flow path switching device. The first heat exchanger includes a first heat exchange section and a second heat exchange section. The flow path switching device is connected to the main line, the first branch line and the third branch line respectively. The refrigeration circuit includes a compressor, a second heat exchanger, a throttling device, and a second heat exchange section. The main circuit includes a first liquid pump and a fourth heat exchanger. The first branch circuit includes the first heat exchange section. The third branch circuit includes a third heat exchanger. The second heat exchanger includes a third heat exchange section and a fourth heat exchange section. The charging gun wire heat exchange system includes a second branch circuit. The second branch circuit includes a second liquid pump and the fourth heat exchange section. The refrigeration circuit includes a third heat exchange section. The second branch circuit is connected to a flow path switching device. The charging gun line heat exchange system has a cooling mode and a natural cooling mode. In the cooling mode, the flow path switching device connects the main path and the first branch, the flow path switching device connects the second branch and the third branch, the cooling circuit circulates refrigerant, the refrigerant in the second heat exchange section cools the coolant in the first heat exchange section, the fourth heat exchanger cools the charging gun line unit, the second branch and the third branch circulate coolant, the third heat exchanger exchanges heat with the external environment, and the coolant in the fourth heat exchange section cools the refrigerant in the third heat exchange section. In natural cooling mode, the flow path switching device connects the main path and the third branch path, the main path and the third branch path are circulated with coolant, the third heat exchanger releases heat to the external environment, and the fourth heat exchanger cools the charging gun line unit.

2. The charging gun wire heat exchange system according to claim 1, characterized in that, The flow path switching device includes a multi-way valve, and the charging gun line heat exchange system also includes a control unit, which is electrically connected to the multi-way valve.

3. The charging gun wire heat exchange system according to claim 2, characterized in that, The multi-way valve includes at least eight valve ports, including a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port, and an eighth valve port. One end of the main line is connected to the first valve port, and the other end of the main line is connected to the second valve port. One end of the first branch line is connected to the third valve port, and the other end of the first branch line is connected to the fourth valve port. One end of the second branch line is connected to the fifth valve port, and the other end of the second branch line is connected to the sixth valve port. One end of the third branch line is connected to the seventh valve port, and the other end of the third branch line is connected to the eighth valve port. In cooling mode, the first valve port is connected to the fourth valve port, the second valve port is connected to the third valve port, the fifth valve port is connected to the eighth valve port, and the sixth valve port is connected to the seventh valve port; In natural cooling mode, the first valve port is connected to the eighth valve port, and the second valve port is connected to the seventh valve port.

4. The charging gun wire heat exchange system according to claim 2, characterized in that, The multi-way valve includes a four-way valve, which includes a first connection port, a second connection port, a third connection port, and a fourth connection port. One end of the main line is connected to the first connection port, one end of the first branch line is connected to the second connection port, one end of the second branch line is connected to the third connection port, one end of the third branch line is connected to the fourth connection port, and the other ends of the main line, the first branch line, the second branch line, and the third branch line are connected. In cooling mode, the first connection port is connected to the second connection port, and the third connection port is connected to the fourth connection port; In natural cooling mode, the first connection port is connected to the fourth connection port, and the second connection port is connected to the third connection port.

5. The charging gun wire heat exchange system according to claim 2, characterized in that, The multi-way valve includes a three-way valve assembly, which includes two three-way valves. One end of the main line, one end of the third branch, and one end of the first branch are respectively connected to the three ports of one of the three-way valves. The other end of the main line, the other end of the third branch, and one end of the second branch are respectively connected to the three ports of the other three-way valve. One end of the first branch is connected to the main line, and the other end of the first branch is located between the first heat exchange section and the fourth heat exchanger. One end of the second branch is connected to the third branch, and the other end of the second branch is located between the third heat exchanger and the fourth heat exchange section. The third branch and the main line are connected in series, the first branch and the main line are connected in series, the second branch and the main line are connected in series, and the first branch, the second branch, and the third branch are connected in parallel.

6. The charging gun wire heat exchange system according to claim 2, characterized in that, The multi-way valve includes a two-way valve group, which includes a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve. The third branch is connected in series with the main branch, the first branch is connected in series with the main branch, the second branch is connected in series with the main branch, and the first, second, and third branches are connected in parallel. The first port of the first solenoid valve is connected to the outlet of the main branch, and the second port of the first solenoid valve is connected to the inlet of the third branch. The first port of the second solenoid valve is connected to the outlet of the main branch, and the first port of the second solenoid valve is connected between the first port of the first solenoid valve and the outlet of the main branch. The first port of the third solenoid valve is connected to the inlet of the first branch; the second port of the third solenoid valve is connected to the outlet of the third branch; the first port of the fourth solenoid valve is connected to the inlet of the main line; the second port of the fourth solenoid valve is connected to the outlet of the third branch, and the second port of the fourth solenoid valve is connected between the outlet of the third branch and the second port of the third solenoid valve; the outlet of the first branch is connected between the first port of the fourth solenoid valve and the inlet of the main line; the outlet of the second branch is connected between the second port of the first solenoid valve and the inlet of the third branch. In cooling mode, the second and third solenoid valves are open, while the first and fourth solenoid valves are closed. In natural cooling mode, the first and fourth solenoid valves are open, while the second and third solenoid valves are closed.

7. The charging gun wire heat exchange system according to claim 2, characterized in that, The charging gun wire heat exchange system includes at least one fan, which is located beside the third heat exchanger. The fan is used to transport outside airflow through the third heat exchanger and is electrically connected to the control unit. The charging gun heat exchange system also includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located at the liquid outlet of the fourth heat exchanger, and the second temperature sensor is located at the liquid inlet of the fourth heat exchanger. The first temperature sensor and the second temperature sensor are used to detect the liquid outlet temperature and the liquid inlet temperature of the fourth heat exchanger, respectively. Both the first temperature sensor and the second temperature sensor are electrically connected to the control unit. The second branch includes a third temperature sensor and a fourth temperature sensor. The third temperature sensor is located at the liquid outlet of the fourth heat exchanger, and the fourth temperature sensor is located at the liquid inlet of the fourth heat exchanger. The third temperature sensor and the fourth temperature sensor are respectively configured to detect the liquid outlet temperature and the liquid inlet temperature of the fourth heat exchanger. Both the third temperature sensor and the fourth temperature sensor are electrically connected to the control unit.

8. The charging gun wire heat exchange system according to any one of claims 1 to 7, characterized in that, The main circuit also includes a liquid replenishment and drainage device, which is connected in series with the fourth heat exchanger and the first liquid pump. The liquid replenishment and drainage device is located between the first liquid pump and the fourth heat exchanger. The liquid replenishment and drainage device includes a water tank, a pressure relief valve installed in the water tank, and a level gauge located at least partially in the water tank. The outlet of the water tank is connected to the inlet of the first liquid pump, and the inlet of the water tank is connected to the outlet of the fourth heat exchanger. The replenishment and drainage device also includes a filter located between the water tank and the first liquid pump. The filter is a Y-type filter.

9. The charging gun wire heat exchange system according to any one of claims 1 to 7, characterized in that, The main circuit also includes a heating unit and a third liquid pump, wherein the heating unit, the third liquid pump and the fourth heat exchanger are connected in series, and the third liquid pump is located between the heating unit and the fourth heat exchanger; The charging gun line heat exchange system also includes a fourth branch and a three-way flow valve. The three-way flow valve is located between the third liquid pump and the fourth heat exchanger. The three-way flow valve includes an inlet and two outlets. The inlet is connected to the third liquid pump, one of the two outlets is connected to the liquid inlet of the fourth branch, and the other is connected to the liquid inlet of the fourth heat exchanger. The liquid outlet of the fourth branch is connected to the outlet of the charging terminal. The charging gun line heat exchange system also includes a fifth solenoid valve, which is connected in series with the charging gun line unit. The refrigeration circuit includes a dryer filter, the throttling device is an electronic expansion valve, the dryer filter, the throttling device, the third heat exchange section and the second heat exchange section are connected, the throttling device is located between the second heat exchange section and the third heat exchange section, and the dryer filter is located between the throttling device and the third heat exchange section.

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