A double circulation cooling device and cooling method for a charging gun

Abstract

The application provides a double-circulation cooling device and method for a charging gun, which comprises a water pump, a water distribution unit, a liquid storage unit and a heat dissipation unit. The water pump comprises a first water pump and a second water pump. The first water pump, the water distribution unit and the liquid storage unit are sequentially connected to form a first circulation system. The second water pump, the heat dissipation unit and the liquid storage unit are sequentially connected to form a second circulation system. The first circulation system and the second circulation system exchange working medium and heat in the liquid storage unit. The double-circulation cooling system used in the application can make the cooling liquid flow through the working units of the circulation cooling system through multiple circuits, and the liquid storage unit is used as a working medium and heat exchange place between the first circulation and the second circulation. The flow of the cooling liquid in the liquid storage unit is switched to different circuits, the water resistance of the cooling liquid flowing through the circuits is small, the operating pressure of the components in the circuits is small, and the reliability of the charging gun cooling device is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of cooling technology, and particularly relates to the field of charging gun cooling. BACKGROUND

[0002] With the rapid growth of new energy vehicles, the market of traditional fuel vehicles has been greatly impacted. In order to solve the last short board of new energy vehicles, that is, the journey anxiety problem, many manufacturers have launched 500KW, 600KW and 800KW super charging piles. Compared with the early fast charging, in order to solve the problem of thermal runaway and the overburden of charging gun during fast charging, engineers further improve the early fast charging pile and begin to adopt the liquid cooling method to cool the charging gun and cable.

[0003] At present, the charging gun mostly adopts a single cycle cooling system of liquid cooling. The cooling liquid directly flows through all working units of the circulating cooling system through one loop. In this way, the circulating route is long, the number of working units is large, the water resistance in the circulating system is too large, the operating pressure is large, and some working units in the system are easily damaged. At present, the liquid cooling charging gun cooling device using double cycle and multi cycle system mostly uses electromagnetic valves, check valves and other valves to switch the flow direction of the pipeline. As long as any valve fails, the cooling device cannot operate normally, which greatly reduces the reliability of the cooling device.

[0004] It can be seen that in the related art, the cooling system of the charging gun has the problem of unreliable operation, which cannot meet the cooling demand of the super charging pile. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a double cycle cooling device for a charging gun, which aims to solve the problem of low reliability of the cooling device in the related art.

[0006] To solve the above technical problems, the present application is implemented as follows, a double cycle cooling device for a charging gun is provided, comprising: a water pump, a water distribution unit, a liquid storage unit and a heat dissipation unit;

[0007] The water pump comprises a first water pump and a second water pump.

[0008] The first water pump, the water distribution unit and the liquid storage unit are connected in sequence to form a first circulation system. The liquid storage unit is used for storing cooling liquid, and the first water pump is used for driving the cooling liquid to flow in the first circulation system.

[0009] The second water pump, the heat dissipation unit and the liquid storage unit are connected in sequence to form a second circulation system. The second water pump is used for driving the cooling liquid to flow in the second circulation system.

[0010] The first circulation system and the second circulation system exchange working fluid and heat within the liquid storage unit.

[0011] Furthermore, the liquid storage unit includes a housing, a first circulating water outlet, a first circulating water return outlet, a second circulating water outlet, and a second circulating water return outlet, the other ends of which are all connected to the housing;

[0012] One end of the first circulating water outlet is connected to the first water pump;

[0013] One end of the first circulating water return port is connected to the water distribution unit;

[0014] One end of the second circulation outlet is connected to the second water pump;

[0015] One end of the second circulation return port is connected to the heat dissipation unit.

[0016] Furthermore, the housing includes a first circulation chamber, a second circulation chamber, a first return water passage, and a second return water passage;

[0017] The housing has a common chamber located outside the first circulation chamber and the second circulation chamber, and both the first circulation chamber and the second circulation chamber are connected to the common chamber;

[0018] The first return water passage is connected to the first circulation return water inlet and the first circulation chamber at both ends, and the first circulation outlet is connected to the first circulation chamber at both ends; the second return water passage is connected to the second circulation return water inlet and the second circulation chamber at both ends, and the second circulation outlet is connected to the second circulation chamber at both ends.

[0019] Furthermore, the connection point between the first return water passage and the first circulation chamber is not higher than the preset minimum liquid level of the tank body, the connection point between the second return water passage and the second circulation chamber is not higher than the preset minimum liquid level of the tank body, the highest point of the connection point between the first circulation chamber and the second circulation chamber and the common chamber is lower than the preset minimum liquid level of the tank body, and the lowest point of the connection point between the first circulation chamber and the second circulation chamber and the common chamber is not lower than the bottom of the tank body.

[0020] Furthermore, the housing also includes a liquid inlet and a liquid level system;

[0021] The filling port is located on the surface of the tank and is used to connect to a device for adding coolant, so that the device can add coolant to the tank.

[0022] The liquid level system includes a liquid level sensor and an early warning component. The detection point of the liquid level sensor is located at the preset minimum liquid level of the tank. The early warning component is connected to the liquid level sensor.

[0023] Furthermore, the dual-cycle cooling device for the charging gun also includes a filter unit, one end of which is connected to the heat dissipation unit and the other end of which is connected to the first circulation return port.

[0024] Furthermore, the height of the first circulation outlet is higher than the height of the second circulation outlet, and the second circulation outlet is flush with the bottom of the tank.

[0025] Furthermore, the water distribution unit includes a water distributor and a charging gun cooling pipe;

[0026] The water distributor includes a water distributor outlet and a water distributor return outlet;

[0027] The charging gun cooling pipe includes a charging gun liquid outlet and a charging gun liquid return port.

[0028] One end of the water distributor outlet is connected to the liquid storage unit, and the other end is connected to the charging gun outlet; one end of the water distributor return port is connected to the first water pump, and the other end is connected to the charging gun return port.

[0029] Furthermore, the dual-cycle cooling device for the charging gun also includes a temperature sensor and a control unit. The liquid storage unit, the water distributor return port, and the heat dissipation unit are all equipped with the temperature sensor, and the control unit is connected to the temperature sensor.

[0030] Furthermore, the heat dissipation unit includes a fan and a radiator. One end of the radiator is connected to the liquid storage unit, and the other end is connected to the second water pump. The fan is used to drive outside air through the radiator.

[0031] Furthermore, the coolant can be water, ethylene glycol solution, silicone oil, or electronic fluorinated liquid.

[0032] This invention also discloses a dual-cycle cooling method for a charging gun, which includes the following steps:

[0033] When the coolant used in the dual-circulation cooling device of the charging gun is electronic fluorinated liquid or ethylene glycol aqueous solution:

[0034] When the charging gun starts working, the first circulation system starts and runs for a predetermined time. When T2>N1 and T2>T1, the second circulation system starts working and the heat dissipation unit starts.

[0035] When the charging gun stops working and T2 < N1, the first circulation system stops working; when ΔT ≥ a °C, the second circulation system still operates according to the established program, and the greater the ΔT, the greater the power of the second circulation system; when ΔT < a °C, the second circulation system is closed;

[0036] When the coolant used in the double-circulation cooling device of the charging gun is silicone oil:

[0037] When the charging gun starts to work, the first circulation system is started. After running for a predetermined duration, when T2 > N2 and T2 > T1, the second circulation system starts to work, and the heat dissipation unit starts to dissipate heat;

[0038] Regardless of whether the charging gun is working or not, when ΔT ≥ a °C and T1 > N2, the second circulation system operates according to the established program, and the greater the ΔT, the greater the power of the second circulation system; when ΔT < a °C, the second circulation system is closed; when T1 < N2, the first water pump intermittently starts to generate heat, so that N2 - b °C < T1 < N2 + b °C;

[0039] T1 is the temperature of the coolant in the liquid storage unit;

[0040] T2 is the temperature of the coolant flowing through the return port of the water distributor;

[0041] T6 is the temperature of the air outside the heat dissipation unit;

[0042] N1 is the set temperature, which is the critical temperature for starting the heat dissipation unit to dissipate heat;

[0043] N2 is the optimal working temperature of the coolant, which is the target working temperature for starting the heat dissipation unit to dissipate heat. N2 is determined and matched through tests and cannot be changed arbitrarily;

[0044] ΔT is the difference between the temperature of the coolant in the common chamber and the temperature of the air outside the heat dissipation unit, and ΔT = T1 - T6

[0045] a is the comparison temperature of ΔT, which is determined and matched through tests;

[0046] b is the fluctuation value of the optimal working temperature of the coolant, which is set according to different coolants.

[0047] The beneficial effects of the present invention compared with the prior art are as follows:

[0048] This invention employs a dual-cycle cooling device for charging guns, comprising a first circulation system consisting of a first water pump, a water distribution unit, and a liquid storage unit connected in sequence, and a second circulation system consisting of a second water pump, a heat dissipation unit, and a liquid storage unit connected in sequence. The first and second circulation systems exchange working fluid and heat within the liquid storage unit. The coolant in this dual-cycle cooling system can flow through multiple loops through the working units of the circulation cooling system. Furthermore, the liquid storage unit cleverly serves as the exchange site for working fluid and heat between the first and second cycles. The coolant flow rate switches between different loops within the liquid storage unit, resulting in low water resistance and low operating pressure on components in each loop. This eliminates the need for valves such as solenoid valves or check valves to switch the flow direction, and reduces the risk of component damage during circulation. This significantly improves the reliability of the charging gun cooling device and better meets the application requirements of supercharging piles. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structural layout of the dual-cycle cooling device for the charging gun in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the structure of the liquid storage device in an embodiment of the present invention;

[0051] Figure 3 This is a front view of the structure of the box in an embodiment of the present invention.

[0052] In the accompanying drawings, the reference numerals represent: 1. Water pump; 11. First water pump; 12. Second water pump; 2. Water distribution unit; 21. Water distributor; 211. Water distributor outlet; 212. Water distributor return outlet; 22. Charging gun cooling pipe; 221. Charging gun liquid return outlet; 222. Charging gun liquid outlet; 3. Liquid storage unit; 31. Housing; 311. First circulation chamber; 312. Second circulation chamber; 313. Common chamber; 314. Circular opening; 315. Liquid inlet; 316. First return water passage; 317. Second return water passage; 32. Liquid level system; 33. First circulation outlet; 34. First circulation return outlet; 35. Second circulation outlet; 36. Second circulation return outlet; 4. Heat dissipation unit; 41. Fan; 42. Radiator; 5. Filter unit. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] Example:

[0055] In this embodiment, asFigure 1 As shown, a dual-cycle cooling device for a charging gun includes a water pump 1, a water distribution unit 2, a liquid storage unit 3, and a heat dissipation unit 4. The water pump 1 includes a first water pump 11 and a second water pump 12.

[0056] The first water pump 11, the water distribution unit 2, and the liquid storage unit 3 are connected in sequence to form a first circulation system. The liquid storage unit 3 is used to store coolant, and the first water pump 11 is used to drive the coolant to flow in the first circulation system. The second water pump 12, the heat dissipation unit 4, and the liquid storage unit 3 are connected in sequence to form a second circulation system. The second water pump 12 is used to drive the coolant to flow in the second circulation system.

[0057] The first and second circulation systems exchange working fluid and heat within the liquid storage unit 3.

[0058] The first circulation system is responsible for driving the coolant within it through the external charging gun cooling pipe 22 to remove heat from the charging gun. Specifically, as follows: Figure 1 As shown, the water distribution unit 2 in the first circulation system is connected to an external charging gun. Driven by the first water pump 11, the cooled coolant flows out of the liquid storage unit 3 and through the water distribution unit 2. The water distribution unit 2 is connected to the external charging gun, and the cooled coolant further flows through the charging gun to cool it down. The temperature of the coolant flowing out of the charging gun rises, and the high-temperature coolant returns to the liquid storage unit 3 through the water distribution unit 2. The high-temperature coolant returning to the liquid storage unit 3 enters the second circulation system for cooling.

[0059] The second circulation system is responsible for circulating and cooling the coolant in the liquid storage unit 3. Specifically, such as... Figure 1 As shown, driven by the second water pump 12, coolant flows out from the liquid storage unit 3, passes through the heat dissipation unit 4 for cooling, and finally returns to the liquid storage unit 3. The cooled coolant that returns to the liquid storage unit 3 re-enters the first circulation system, repeating the operation of the first circulation system to cool the external charging gun.

[0060] The first circulation system separates the charging gun from the components with high water resistance in the second circulation system. This significantly reduces the water resistance of the coolant flowing through the first circulation system, thereby lowering the risk of charging gun tube rupture and leakage. Furthermore, while the coolant in the original single circulation system flowed through all components, the dual circulation system distributes the components across two circulation systems, greatly reducing water resistance in each circulation and increasing the reliability of the cooling device. The two circulations do not interfere with each other; water pump 1 can operate independently. The liquid storage unit 3 serves as the working fluid and heat exchanger in the dual circulation, eliminating the need for check valves and solenoid valves, reducing the number of components, lowering costs, and further enhancing the reliability of the cooling device.

[0061] In other embodiments, the arrangement order of the components in the first circulation system and the second circulation system can be different. Specifically, in the first circulation system, the arrangement order of the components along the flow direction of the coolant can be: the first water pump 11, the water distribution unit 2, and the liquid storage unit 3 arranged in sequence; or, the water distribution unit 2, the first water pump 11, and the liquid storage unit 3 arranged in sequence. In the second circulation system, the arrangement order of the components along the flow direction of the coolant can be: the second water pump 12, the heat dissipation unit 4, and the liquid storage unit 3 arranged in sequence; or, the heat dissipation unit 4, the second water pump 12, and the liquid storage unit 3 arranged in sequence.

[0062] It should be understood that the arrangement order of the components of the first circulation system and the arrangement order of the components of the second circulation system do not affect each other. That is, any arrangement order of the components of the first circulation system can be combined with any arrangement order of the components of the second circulation system, as long as the two circulation systems share a single liquid storage unit 3.

[0063] In this embodiment, only the first and second circulation systems are used to form a dual circulation system. In other embodiments, more circulation systems can be added, such as a triple circulation system, a quadruple circulation system, or other multi-circulation systems.

[0064] Furthermore, the liquid storage unit 3 includes a first circulation outlet 33, a first circulation return outlet 34, a second circulation outlet 35, a second circulation return outlet 36, and a housing 31. Figure 2 As shown, one end of the first circulation outlet 33 is connected to the first water pump 11, one end of the first circulation return outlet 34 is connected to the water distribution unit 2, one end of the second circulation outlet 35 is connected to the second water pump 12, one end of the second circulation return outlet 36 is connected to the heat dissipation unit 4, and the other ends of the first circulation outlet 33, the first circulation return outlet 34, the second circulation outlet 35, and the second circulation return outlet 36 are all connected to the housing 31.

[0065] In other embodiments, the connections of the first circulation outlet 33 and the first circulation return outlet 34 to other components of the first circulation system may be different. Specifically, one end of the first circulation outlet 33 may be connected to the first water pump 11, and one end of the first circulation return outlet 34 may be connected to the water distribution unit 2; or, one end of the first circulation outlet 33 may be connected to the water distribution unit 2, and the first circulation return outlet 34 may be connected to the first water pump 11.

[0066] In other embodiments, the second circulation outlet 35 and the second circulation return outlet 36 may be connected to different components of the second circulation system. Specifically, one end of the second circulation outlet 35 may be connected to the second water pump 12, and one end of the second circulation return outlet 36 may be connected to the heat dissipation unit 4; or, one end of the second circulation outlet 35 may be connected to the heat dissipation unit 4, and the second circulation return outlet 36 may be connected to the second water pump 12.

[0067] Furthermore, the housing 31 includes a first circulation chamber 311, a second circulation chamber 312, a first return water passage 316, and a second return water passage 317;

[0068] like Figure 2 As shown, the housing 31 has a common chamber 313 located outside the first circulation chamber 311 and the second circulation chamber 312. The first circulation chamber 311 and the second circulation chamber 312 are both connected to the common chamber 313. The two ends of the first return water passage 316 are respectively connected to the first circulation return water inlet 34 and the first circulation chamber 311. The first circulation outlet 33 is connected to the first circulation chamber 311. The two ends of the second return water passage 317 are respectively connected to the second circulation return water inlet 36 and the second circulation chamber 312. The second circulation outlet 35 is connected to the second circulation chamber 312.

[0069] In this embodiment, the box 31 is a regular square prism. The first circulation chamber 311 is a cuboid chamber formed by the partition and the inner wall of the box 31. The second circulation chamber 312 is also a cuboid chamber formed by the partition and the inner wall of the box 31. The first circulation chamber 311 and the second circulation chamber 312 are both located at the bottom of the box 31 and are located at two opposite corners of the box 31. There is a gap between the first circulation chamber 311 and the second circulation chamber 312. The length extension directions of the first circulation chamber 311 and the second circulation chamber 312 are parallel to each other and parallel to one side of the bottom surface of the box 31. One end of the first circulation chamber 311 is spaced from the inner wall of the housing 31, and a circular opening 314 is formed at that end. One end of the second circulation chamber 312 is also spaced from the inner wall of the housing 31, and a circular opening 314 is formed at that end. The circular openings 314 of the first and second circulation chambers 311 and 312 face different directions, and the diameter of the circular opening 314 is larger than the diameter of the first circulation outlet 33 and the second circulation outlet 35. The side length of each cuboid chamber is more than twice the diameter of the circular opening 314. The first and second circulation chambers 311 and 312 are placed diagonally with a gap, and the circular openings 314 face different directions. This design avoids the rapid mixing of high-temperature and low-temperature coolants in different chambers, resulting in a low temperature difference between the coolant entering the heat dissipation unit 4 from the housing 31 and the air, thus reducing cooling efficiency.

[0070] The purpose of having a diameter larger than that of the first circulation outlet 33 and the second circulation outlet 35 is to prevent the cross-sectional area of ​​the circular opening 314 from being smaller than the cross-sectional area of ​​the flow interface between the coolant in the first and second circulation systems. This avoids insufficient flow of coolant into the common chamber 313, preventing inadequate mixing of the coolant within the common chamber 313. The allowance in the dimensions of the first circulation chamber 311 and the second circulation chamber 312 not only does not affect the water pump 1's water replenishment and pressure stabilization but also minimizes the water resistance generated by the first and second circulation chambers 311 and 312. When the ambient temperature is low, the second circulation system is not needed to cool the coolant at the beginning of charging. Only the first circulation system is operating. The coolant flowing into the first circulation chamber 311 from the first circulation return outlet 34 can be fully mixed with the existing coolant inside the tank 31 through the circular opening 314. This design can serve as a cold storage function, preventing drastic fluctuations in water temperature.

[0071] The first return water passage 316 and the second return water passage 317 can be two flexible hoses. The upper part of the housing 31 contains air, and the lower part contains coolant. After installing the first return water passage 316 and the second return water passage 317, the coolant flowing out from the first circulation return water port 34 and the second circulation return water port 36 can enter the coolant level below the housing 31, avoiding the generation of air bubbles by liquid impact, and thus avoiding cavitation of the water pump 1 by air bubbles.

[0072] It should be understood that in other embodiments, the first circulation chamber 311 and the second circulation chamber 312 can be made not only into a cuboid shape, but also into a sphere or other cavities with shapes that prevent the coolant from spreading around. Besides directly opening a circular opening 314 to connect the first circulation chamber 311 and the second circulation chamber 312 to the common chamber 313, they can also be connected to the common chamber 313 through an organic membrane or ceramic membrane, or through a liquid switching valve. Regardless of the connection method, as long as the flow rate of coolant at the connection point between the first circulation chamber 311 and the second circulation chamber 312 and the common chamber 313 is greater than the flow rate of coolant at the cross-section of the first and second circulation systems, the connection method between the first circulation chamber 311 and the second circulation chamber 312 and the common chamber 313 can also be different depending on the temperature or other properties of the coolant entering the first circulation chamber 311 and the second circulation chamber 312. The first return water passage 316 and the second return water passage 317 are not limited to passages made of different materials such as flexible hoses or rigid pipes; any passage with good sealing is acceptable.

[0073] In this embodiment, specifically, the coolant circulation process within the housing 31 of the first circulation system is as follows: The coolant flowing out of the first circulation return port 34 enters the first circulation chamber 311 directly through the first return water passage 316. The first circulation chamber 311 has a circular opening 314 that exchanges working fluid with the coolant outside the chamber. After the first water pump 11 of the first circulation system is turned on, the coolant in the first circulation chamber 311 can be driven to flow into the first circulation outlet 33, allowing the coolant in the first circulation chamber 311 to enter and operate within the first circulation system. Because the coolant flowing out of the first circulation return port 34 is already cooled by the second circulation system, the coolant entering the first circulation chamber 311 is at a low temperature. The coolant in the first circulation chamber 311 slowly mixes with the existing coolant in the housing 31 through the circular opening 314 on the first circulation chamber 311. This reduces the degree of mixing between the coolant cooled by the second circulation system and the existing coolant in the housing 31. Meanwhile, the design that allows the coolant in the first circulation chamber 311 to be directly driven into the first circulation outlet 33 shortens the distance from the cooled coolant to the first circulation outlet 33, preventing the cooled coolant from rising in temperature during mixing and transmission, and further improving the cooling efficiency of the charging gun.

[0074] The coolant circulation process in the second circulation system within the housing 31 is as follows: The coolant flowing out of the second circulation return port 36 enters the second circulation chamber 312 directly through the second return passage 317. The second circulation chamber 312 has only one circular opening 314 for working fluid exchange with the coolant outside the chamber. After the water pump 1 of the second circulation system is turned on, the coolant in the second circulation chamber 312 can be driven to flow into the second circulation system. The coolant entering the second circulation chamber 312 is the high-temperature coolant that has returned after passing through the first circulation system. The coolant outside the second circulation chamber 312 has a lower temperature. The high-temperature coolant in the second circulation chamber 312 slowly mixes with the existing coolant in the housing 31 through the circular opening 314. This design reduces the degree of mixing between the high-temperature coolant returning to the housing 31 and the existing coolant in the housing 31. After the second water pump 12 is turned on, the coolant in the second circulation chamber 312 can flow directly into the second circulation outlet 35. The coolant enters the second circulation system through the second circulation outlet 35 to cool down. Because the high temperature coolant in the second circulation chamber 312 has a low degree of mixing with the existing coolant, the temperature difference between the coolant and the surrounding air is large when the coolant flows through the second circulation system. The high heat transfer temperature difference improves the heat dissipation efficiency of the heat dissipation unit 4, and the coolant cools down faster, thereby improving the cooling efficiency of the charging gun.

[0075] Furthermore, such as Figure 2 As shown, the housing 31 also includes a liquid inlet 315 and a liquid level system 32.

[0076] A coolant inlet 315 is provided on the surface of the housing 31. The coolant inlet 315 is used to connect to a device for adding coolant, so that the device can replenish coolant into the housing 31. The liquid level system 32 includes a liquid level sensor and an early warning component. The detection point of the liquid level sensor is located at the preset minimum liquid level of the housing 31; the early warning component is connected to the liquid level sensor.

[0077] In other embodiments, a removable filler cap can be installed on the filler port 315. The filler cap can be a vent valve open to the atmosphere or a plug completely sealed to the atmosphere. When the added coolant is not easily evaporable, a vent valve can be used as the filler cap. When the temperature of the coolant flowing into the housing 31 is too high, the air pressure in the housing 31 increases. Using a vent valve as the filler cap allows air above the housing 31 to be discharged into the atmosphere through the vent valve. When the coolant temperature inside the housing 31 drops, air enters the housing 31 through the vent valve, solving the problem of unstable gas pressure inside the housing 31 due to large temperature fluctuations. However, when using easily evaporable coolants such as electronic fluorinated liquids, a plug-type filler cap is required. The plug is only opened when adding coolant, the filler port 315 is connected to the coolant adding device, and after adding, the filler port 315 is sealed with the plug; otherwise, the easily evaporable coolant will evaporate quickly.

[0078] The liquid level sensor can be of different types, such as contact or non-contact, and can be selected according to the type of coolant used. The liquid level sensor presets the highest and lowest liquid levels of the coolant in the tank 31. When the coolant in the tank 31 is lower than the lowest level or higher than the highest level, the liquid level sensor outputs a liquid level signal. The warning component receives the liquid level signal and outputs an alarm sound. In other embodiments, the warning component can also be connected to a display screen to output liquid level information. The liquid level system 32 and the filler port 315 can ensure that there is a constant range of coolant in the tank 31, that is, the highest liquid level of the coolant is lower than the height of the first circulation return port 34 and the second circulation return port 36, and the lowest liquid level of the coolant is higher than the height of the first circulation outlet 33 and the second circulation outlet 35, so as to avoid the coolant circulation of the cooling device being affected by too little or too much coolant.

[0079] Furthermore, the connection between the first return water passage 316 and the first circulation chamber 311 is not higher than the preset minimum liquid level of the tank 31, the connection between the second return water passage 317 and the second circulation chamber 312 is not higher than the preset minimum liquid level of the tank 31, the highest point of the connection between the first circulation chamber 311 and the second circulation chamber 312 and the common chamber 313 is lower than the preset minimum liquid level of the tank 31, and the lowest point of the connection between the first circulation chamber 311 and the second circulation chamber 312 and the common chamber 313 is not lower than the bottom of the tank 31.

[0080] likeFigure 3 As shown, specifically in this embodiment, both the first circulation chamber 311 and the second circulation chamber 312 are cuboid in shape. The top of the first circulation chamber 311 is connected to the first return water passage 316 via a pagoda connector, and the top of the second circulation chamber 312 is connected to the second return water passage 317 via a pagoda connector. The connection points of all the above-mentioned pagoda connectors are not higher than the preset minimum liquid level of the tank 31. The highest point of the connection between the first circulation chamber 311, the second circulation chamber 312, and the common chamber 313 is lower than the preset minimum liquid level of the tank 31. With this configuration, gas will not enter the first circulation chamber 311 and the second circulation chamber 312, and no bubbles will be generated during the operation of the first and second circulation systems, ensuring the normal operation of the first and second circulation systems and reducing the operational risk of the dual-circulation cooling device.

[0081] Furthermore, such as Figure 1 As shown, the dual-cycle cooling device for the charging gun also includes a filter unit 5, one end of which is connected to the heat dissipation unit 4, and the other end is connected to the first circulation return port 34.

[0082] In this embodiment, specifically, the filter unit 5 is a Y-type filter, which is installed near the return water inlet and above the highest liquid level. The filter is filled with air, and the coolant has already flowed into the housing 31 due to gravity. Therefore, whether it is an open circulation, closed circulation, or a closed circulation completely isolated from the atmosphere, when there are too many impurities and it is necessary to replace the filter or the filter screen, the filter can be replaced directly without draining the coolant or worrying about coolant leakage.

[0083] In other embodiments, the filter unit 5 may also be selected as a straight-through pipe filter, a T-type pipe filter, or a dual-switching filter, or other filters with pipe filtration functions.

[0084] Furthermore, such as Figure 3 As shown, the height of the first circulation outlet 33 is higher than the height of the second circulation outlet, and the second circulation outlet 35 is flush with the bottom of the tank 31.

[0085] The first circulation system is connected to the charging gun. The charging gun and its cable are subjected to harsh operating environments such as dragging, bending, and being run over by vehicles. Furthermore, the cross-sectional area of ​​the charging gun cable is typically small. If large particles of impurities enter the first circulation system, it may cause blockages in the charging gun cable. Therefore, this invention designs the first circulation outlet 33 to be higher than the second circulation outlet 35, and places the second circulation outlet 35 at the lowest position of the housing 31. This directs impurities generated during coolant circulation to the second circulation system, indirectly protecting the first circulation system.

[0086] Furthermore, the water distribution unit 2 includes a water distributor 21 and a charging gun cooling pipe 22;

[0087] like Figure 1 As shown, the water distributor 21 includes a water distributor outlet 211 and a water distributor return outlet 212, and the charging gun cooling pipe 22 includes a charging gun liquid outlet 222 and a charging gun liquid return outlet 221. One end of the water distributor outlet 211 is connected to the liquid storage unit 3, and the other end is connected to the charging gun liquid outlet 222; one end of the water distributor return outlet 212 is connected to the first water pump 11, and the other end is connected to the charging gun liquid return outlet 221.

[0088] The first water pump 11 is turned on, and the coolant flows sequentially through the first circulation outlet 33, the water distributor return outlet 212, the charging gun return outlet 221, the charging gun outlet 222, the water distributor outlet 211, and the liquid storage unit 3. The water distributor 21 is connected to the charging gun cooling pipe 22 separately, which greatly reduces the water resistance of the circulation system, thereby reducing the risk of charging gun pipe bursting and leakage.

[0089] Furthermore, the dual-cycle cooling device for the charging gun also includes a temperature sensor and a control unit. Temperature sensors are installed in the liquid storage unit 3, the water distributor return port 212, and the heat dissipation unit 4. The control unit is connected to the temperature sensor.

[0090] In other embodiments, a temperature sensor, also connected to the control unit, can be installed at the water distributor outlet 211, the second circulation return outlet 36, and the second circulation outlet 35 for fault detection of the dual-circulation cooling device.

[0091] Furthermore, such as Figure 1 As shown, the heat dissipation unit 4 includes a fan 41 and a radiator 42. One end of the radiator 42 is connected to the liquid storage unit 3, and the other end is connected to the second water pump 12. The fan 41 is used to drive outside air through the radiator 42. In other embodiments, in addition to air cooling, water cooling and other heat dissipation methods can also be used.

[0092] Furthermore, the coolant can be water, ethylene glycol solution, silicone oil, or electronic fluorinated fluid.

[0093] The present invention also provides a dual-cycle cooling method for a charging gun. In this embodiment, the specific steps of the dual-cycle cooling method for the charging gun are as follows:

[0094] When the dual-circulation cooling device for the charging gun uses a low-viscosity coolant, such as electronic fluorinated liquid or ethylene glycol aqueous solution:

[0095] When the charging gun starts working, the first cycle system starts and runs for a predetermined time. When T2>N1 and T2>T1, the second cycle system starts working and the heat dissipation unit 4 starts.

[0096] When the charging gun stops working and T2 < N1, the first circulation system stops working; when ΔT ≥ 3°C, the second circulation system still operates according to the established program, and the greater ΔT is, the greater the power of the second circulation system; when ΔT < a°C, the second circulation system is closed;

[0097] When the coolant used in the double-circulation cooling device of the charging gun is a high-viscosity coolant, such as silicone oil:

[0098] When the charging gun starts to work, the first circulation system starts. After running for a predetermined duration, when T2 > N2 and T2 > T1, the second circulation system starts to work, and the heat dissipation unit 4 starts to dissipate heat;

[0099] Regardless of whether the charging gun is working or not, when ΔT ≥ a°C and T1 > N2, the second circulation system operates according to the established program, and the greater ΔT is, the greater the power of the second circulation system; when ΔT < 3°C, the second circulation system is closed; when T1 < N2, the first water pump 11 intermittently starts to generate heat to make N2 - b°C < T1 < N2 + b°C;

[0100] T1 is the temperature of the coolant in the liquid storage unit 3;

[0101] T2 is the temperature of the coolant flowing through the return water port 212 of the water distributor;

[0102] T6 is the temperature of the air outside the heat dissipation unit 4;

[0103] N1 is the set temperature, which is the critical temperature for starting the heat dissipation unit 4 to dissipate heat;

[0104] N2 is the optimal working temperature of the coolant, which is the target working temperature for starting the heat dissipation unit 4 to dissipate heat. N2 is determined and matched through tests and cannot be changed arbitrarily;

[0105] ΔT is the difference between the temperature of the coolant in the liquid storage unit 3 and the temperature of the air outside the heat dissipation unit 4, and ΔT = T1 - T6;

[0106] a is the comparison temperature of ΔT, which is determined and matched through tests;

[0107] b is the fluctuation value of the optimal working temperature of the coolant, which is set according to different coolants.

[0108] In this embodiment, when the charging gun starts working, after the first circulation system has been running for a predetermined time of 5-10 seconds, logical judgments are made on T1 / T2 / T6. Specifically, T1 is the temperature of the coolant in the common chamber 313, and T6 is the temperature of the air inlet of the fan 41 in the heat dissipation unit 4. ΔT = T1 - T6, which is the difference between the temperature of the coolant in the common chamber 313 and the temperature of the air inlet of the fan 41. When ΔT ≥ 3℃, the temperature difference between the coolant to be cooled in the common chamber 313 and the air around the radiator 42 is too large. At this time, the second circulation system should be activated to cool the coolant and improve the cooling efficiency of the dual-circulation cooling device of the charging gun. In other embodiments, 2-3℃ is the optimal temperature range for a, and the specific value is determined through multiple tests based on different coolants used.

[0109] In this embodiment, the electronic fluorinated liquid and ethylene glycol aqueous solution are low-viscosity coolants with slow dynamic viscosity changes with temperature, while silicone oil is a low-viscosity coolant with large dynamic viscosity changes with temperature. Therefore, when using silicone oil as a coolant, it is necessary to maintain it at its optimal operating temperature N2 to avoid low circulation efficiency of the silicone oil in the circulation system. Specifically, the temperature of the silicone oil in the liquid storage unit 3 fluctuates within the range of N2 ± b℃, where b = 5℃, i.e., N2 ± 5℃. When the ambient temperature is low, high-viscosity coolants such as silicone oil need to be heated to their optimal operating temperature. In a single-cycle cooling system, there is only one circulation loop, and the coolant inevitably flows through the heat dissipation unit, which slows down the rate of temperature rise or prevents it from reaching the optimal operating temperature. However, the dual-cycle cooling system for the charging gun in this invention can not only simultaneously activate two water pumps to make both circulation systems work at the same time, but also activate only one water pump to start the first circulation system separately. The coolant does not need to pass through the heat dissipation unit 4, avoiding the defects of the single-cycle cooling system and greatly improving efficiency.

[0110] In other embodiments, T3 / T4 / T5 can also be detected. After the second circulation system has been running for a period of time, if T4 > T6, T5 > T6, and the difference between T4 and T5 is extremely small, it can be determined that the heat dissipation unit 4 has malfunctioned. This may be due to damage to the fan 41 or dust accumulation on the radiator 42, which prevents the heat dissipation unit 4 from effectively cooling the liquid. T3 is the coolant temperature at the water distributor outlet 211, T4 is the coolant temperature at the second circulation return water inlet 36, and T5 is the coolant temperature at the second circulation outlet 35.

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double circulation cooling device for charging gun, comprising a water pump, a water distribution unit, a liquid storage unit and a heat dissipation unit, characterized in that, the water pump comprises a first water pump and a second water pump; the first water pump, the water distribution unit and the liquid storage unit are connected in sequence to form a first circulation system, the liquid storage unit is used for storing cooling liquid, and the first water pump is used for driving the cooling liquid to flow in the first circulation system; the second water pump, the heat dissipation unit and the liquid storage unit are connected in sequence to form a second circulation system, and the second water pump is used for driving the cooling liquid to flow in the second circulation system; the first circulation system and the second circulation system exchange working medium and heat in the liquid storage unit; the liquid storage unit comprises a box, a first circulation outlet, a first circulation return inlet, a second circulation outlet and a second circulation return inlet, the first circulation outlet, the first circulation return inlet, the second circulation outlet and the second circulation return inlet are connected to the box at the other end; the first circulation outlet is connected to the first water pump at one end; the first circulation return inlet is connected to the water distribution unit at one end; the second circulation outlet is connected to the second water pump at one end; the second circulation return inlet is connected to the heat dissipation unit at one end; the box comprises a first circulation chamber, a second circulation chamber, a first return water passage and a second return water passage; the box has a common chamber outside the first circulation chamber and the second circulation chamber, and the first circulation chamber and the second circulation chamber are communicated with the common chamber; the first return water passage is communicated with the first circulation return inlet and the first circulation chamber at both ends, and the first circulation outlet is communicated with the first circulation chamber; the second return water passage is communicated with the second circulation return inlet and the second circulation chamber at both ends, and the second circulation outlet is communicated with the second circulation chamber.

2. The double circulation cooling device for charging gun according to claim 1, characterized in that, The connection between the first return water passage and the first circulation chamber is not higher than the preset minimum liquid level of the box, the connection between the second return water passage and the second circulation chamber is not higher than the preset minimum liquid level of the box, and the highest point of the communication between the first circulation chamber and the second circulation chamber and the common chamber is lower than the preset minimum liquid level of the box.

3. The double circulation cooling device for charging gun according to claim 1, characterized in that, The box further comprises a liquid inlet and a liquid level system; the liquid inlet is arranged on the surface of the box, and is connected to a device for adding cooling liquid to supplement the cooling liquid in the box; the liquid level system comprises a liquid level sensor and a warning component, the detection site of the liquid level sensor is located at the preset minimum liquid level of the box, and the warning component is connected to the liquid level sensor.

4. The double circulation cooling device for the charging gun according to claim 1, characterized in that, The double circulation cooling device for charging gun further comprises a filter unit, one end of the filter unit is connected to the heat dissipation unit, and the other end is connected to the first circulation return inlet.

5. The double circulation cooling device for charging gun according to claim 1, characterized in that, The height of the first circulation outlet is higher than that of the second circulation outlet, and the second circulation outlet is flush with the bottom of the box.

6. The double circulation cooling device for charging gun according to claim 1, characterized in that, the water distribution unit comprises a water distributor and a charging gun cooling pipe; The water distributor comprises a water distributor water outlet and a water distributor water return outlet; The charging gun cooling pipe comprises a charging gun liquid outlet and a charging gun liquid return outlet; One end of the water distributor water outlet is connected to the liquid storage unit, and the other end is connected to the charging gun liquid outlet; one end of the water distributor water return outlet is connected to the first water pump, and the other end is connected to the charging gun liquid return outlet.

7. The double circulation cooling device for the charging gun according to claim 6, characterized in that, The charging gun double-circulation cooling device further comprises a temperature sensor and a control unit, and the temperature sensor is installed on the liquid storage unit, the water distributor water return outlet and the heat dissipation unit; the control unit is connected to the temperature sensor.

8. A double circulation cooling method for a charging gun, characterized by, A charging gun double-circulation cooling device for claim 7; the charging gun double-circulation cooling method comprises the following steps: When the cooling liquid used by the charging gun double-circulation cooling device is a low-viscosity cooling liquid: When the charging gun starts to work, the first circulation system starts to work, and after running for a predetermined time, when T2>N1 and T2>T1, the second circulation system starts to work, and the heat dissipation unit starts to work; When the charging gun stops working, and T2<N1, the first circulation system stops working; when ΔT≥a℃, the second circulation system still operates according to the predetermined program, and the greater ΔT is, the greater the power of the second circulation system is; when ΔT When the cooling liquid used by the charging gun double-circulation cooling device is a high-viscosity cooling liquid: When the charging gun starts to work, the first circulation system starts to work, and after running for a predetermined time, when T2>N2 and T2>T1, the second circulation system starts to work, and the heat dissipation unit starts to work; Whether the charging gun works or not, when ΔT≥a℃ and T1>N2, the second circulation system operates according to the predetermined program, and the greater ΔT is, the greater the power of the second circulation system is; when ΔT T1 is the temperature of the cooling liquid in the liquid storage unit; T2 is the temperature of the cooling liquid flowing through the water distributor water return outlet; T6 is the temperature of the air outside the heat dissipation unit; N1 is a set temperature, which is a critical temperature for starting the heat dissipation unit to dissipate heat; N2 is the optimal working temperature of the cooling liquid, which is the target working temperature for starting the heat dissipation unit to dissipate heat, and N2 is matched by test and cannot be changed at will; ΔT is the difference between the temperature of the cooling liquid in the liquid storage unit and the temperature of the air outside the heat dissipation unit, ΔT=T1-T6; a is a comparative temperature of ΔT, which is matched by test; b is the fluctuation value of the optimal working temperature of the cooling liquid, which is set according to different cooling liquids.

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