Outer circulation heat dissipation device of charging station

Abstract

The invention relates to a charging station external circulation heat dissipation device which comprises a charging station body, and the charging station body comprises a shell and charging station equipment installed in the shell. The outer channel heat dissipation assembly comprises a ventilation heat dissipation pipeline installed outside the shell, the ventilation heat dissipation pipeline is provided with an air inlet port and an air outlet port, an air cooler is installed at the air inlet port of the ventilation heat dissipation pipeline, and an exhaust fan is installed at the air outlet port of the ventilation heat dissipation pipeline; the circulating heat exchange assembly comprises a fin type heat exchanger, a plurality of contact pieces filled with heat-conducting media and a heat-conducting medium circulating part, and the fin type heat exchanger is installed in the ventilation and heat dissipation pipeline and exchanges heat with air flowing in the ventilation and heat dissipation pipeline; and the plurality of contact pieces are communicated with the finned heat exchanger through the circulating liquid passing pipeline part. According to the charging station, the overall heat dissipation efficiency is effectively enhanced, the working temperature of the charging station equipment can be kept within a proper range, and compared with a traditional heat dissipation mode, the heat dissipation speed is remarkably increased.

Description

Technical Field

[0001] The present invention relates to the technical field of charging station equipment, and in particular to an external circulation heat dissipation device for a charging station. Background Art

[0002] As electric vehicles become more and more popular, the number of charging stations is also increasing. During the charging process, the charging piles and related electrical equipment in the charging station will generate a lot of heat. If this heat cannot be dissipated in a timely and effective manner, it will cause the equipment temperature to be too high, affecting its performance and service life, and may even cause safety hazards, such as overheating, damage, short circuit, etc.

[0003] At present, there are some major shortcomings in the common cooling methods of charging stations. For example, some use internal circulation cooling systems, which have limited cooling efficiency. The cooling medium is often the air inside the charging station. During the continuous cooling process, the air temperature inside the station will continue to rise as heat is absorbed, and the temperature difference between the air and the charging equipment will gradually decrease, which is prone to local heat accumulation. When the temperature difference becomes smaller, the rate of heat transfer will be significantly reduced, and the cooling effect and efficiency will be greatly reduced, resulting in the inability to dissipate the heat of the equipment in time, and the temperature is likely to remain high, resulting in poor cooling effect for the charging station. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an external circulation heat dissipation device for a charging station. The specific technical solution is as follows:

[0005] The external circulation heat dissipation device of the charging station includes:

[0006] A charging station body, the charging station body comprising a shell and a charging station device installed inside the shell;

[0007] The outer channel heat dissipation component comprises a ventilation and heat dissipation duct installed outside the housing, the ventilation and heat dissipation duct having an air inlet port and an air outlet port, an air cooler is installed at the air inlet port of the ventilation and heat dissipation duct, and an exhaust fan is installed at the air outlet port of the ventilation and heat dissipation duct;

[0008] The circulating heat exchange component includes a finned heat exchanger, a plurality of contact pieces with a heat-conducting medium injected therein, and a heat-conducting medium circulation part. The finned heat exchanger is installed inside a ventilation and heat dissipation duct to exchange heat with the air flowing in the ventilation and heat dissipation duct. The contact piece contacts the heat end generated by the charging station equipment. The plurality of contact pieces are connected to the finned heat exchanger through a circulating liquid pipeline part. The circulating liquid pipeline part is used to continuously circulate the heat-conducting medium among the contact piece, the circulating liquid pipeline part, and the finned heat exchanger.

[0009] As an improvement of the above technical solution: the finned heat exchanger includes a plurality of heat exchange tubes arranged in an array, adjacent heat exchange tubes are connected through pipelines, and the surfaces of the heat exchange tubes are connected to first heat dissipation fins.

[0010] As an improvement of the above technical solution: the contact member includes a contact sleeve, the circulating liquid pipeline portion includes a first liquid tank and a second liquid tank, the heat transfer medium circulation portion includes a circulating pump, the contact sleeve is connected with a second liquid pipe, the other end of the second liquid pipe is connected with the second liquid tank, the input end of the circulating pump is connected with the inside of the second liquid tank through a pipeline, the output end of the circulating pump is connected with the heat exchange tube at the head end of the fin-type heat exchange portion through a third liquid pipe, the heat exchange tube at the tail end of the fin-type heat exchange portion is connected with a fourth liquid pipe, the contact sleeve is connected with a first liquid pipe, the other end of the first liquid pipe is connected with the first liquid tank, and the other end of the fourth liquid pipe is connected with the first liquid tank.

[0011] As an improvement of the above technical solution: a second one-way valve is installed at one end of the second liquid tube close to the contact sleeve, and the second one-way valve makes the liquid flow direction of the second liquid tube flow from one end of the second liquid tube close to the contact sleeve to the other end of the second liquid tank; a first one-way valve is installed at one end of the first liquid tube close to the contact sleeve, and the first one-way valve makes the liquid flow direction of the first liquid tube flow from one end of the first liquid tube close to the contact sleeve to the other end of the first liquid tank.

[0012] As an improvement of the above technical solution: an installation isolation frame is connected to the interior of the shell, and an insulation cavity is formed between the outer wall of the installation isolation frame and the inner wall of the shell, and a U-shaped sealing block is fixedly connected to the front of the insulation cavity, and the U-shaped sealing block is used to seal the insulation cavity, the charging station equipment is located on the inner side of the installation isolation frame, the circulating liquid pipeline is located on the outer side of the installation isolation frame, and the outer side surface of the contact sleeve is connected to the insulation frame, and the contact sleeve is fixedly connected to the installation isolation frame, one end of the contact sleeve is located on the inner side of the installation isolation frame, and the other end of the contact sleeve is located in the insulation cavity, so that the installation isolation frame and the insulation frame can effectively isolate the heat of the contact sleeve from reflux and dissipation to the inside of the installation isolation frame and the periphery of the charging station equipment, and the installation isolation frame can also play an isolation role between the charging station equipment and the components inside the insulation cavity.

[0013] As an improvement of the above technical solution: a first main pipe is provided inside the ventilation and heat dissipation duct at the air outlet end of the air cooler, and the first main pipe is connected to a second air inlet pipe and the first air inlet pipe, the other end of the second air inlet pipe faces the flow direction of the ventilation and heat dissipation duct, and the other end of the first air inlet pipe extends into the heat-insulating cavity; a second main pipe is provided inside the ventilation and heat dissipation duct at the air inlet end of the exhaust fan, and the second main pipe is connected to a first air outlet pipe and a third air outlet pipe, the other end of the first air outlet pipe faces the flow direction of the ventilation and heat dissipation duct, and the other end of the third air outlet pipe extends into the heat-insulating cavity.

[0014] As an improvement of the above technical solution: a third one-way valve is installed on the first air outlet pipe, and a fourth one-way valve is installed on the third air outlet pipe. The third one-way valve makes the ventilation direction of the first air outlet pipe toward the second main pipe, and the fourth one-way valve makes the ventilation direction of the third air outlet pipe toward the second main pipe, so that the air inside the ventilation and heat dissipation duct and the air inside the insulation cavity can flow out from the exhaust fan in one direction.

[0015] As an improvement of the above technical solution: one end of the contact sleeve located inside the insulation cavity is connected to a plurality of second heat dissipation fins, and the other end of the contact sleeve is connected to a silicone heat conductive block in contact with the heating end of the charging station device.

[0016] As an improvement of the above technical solution: a door body is hinged on the front of the shell, a ventilation filter is installed on the door body, and a fan is installed on the shell. The filter can be ventilated by the fan to facilitate the heat around the charging station equipment to be dissipated to the outside of the shell.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present application adopts a design that combines a circulating heat exchange component with an external channel heat dissipation component. In the circulating heat exchange component, the heat exchange tubes and heat dissipation fin structure of the finned heat exchanger can greatly increase the contact area with the air, and efficiently transfer the heat in the heat transfer medium to the air in the ventilation and heat dissipation duct. In actual operation, when the charging station equipment is in high-load operation and generates a large amount of heat, the heat can be quickly transferred to the heat exchanger through this component to ensure that the temperature of the core components of the equipment will not rise sharply. In addition, the air cooler and exhaust fan of the external channel heat dissipation component work together to accelerate the flow of air in the ventilation and heat dissipation duct. The air cooler continuously provides low-temperature air to take away the heat from the heat exchanger and surrounding components. The exhaust fan discharges hot air in time to maintain a low-temperature environment in the pipeline, which effectively enhances the overall heat dissipation efficiency and can keep the operating temperature of the charging station equipment within an appropriate range. Compared with traditional heat dissipation methods, the heat dissipation speed is significantly improved.

[0019] 2. This application effectively isolates the heat transfer between the charging station equipment and the insulation cavity and the contact sleeve by installing an isolation frame and an insulation frame. The presence of the insulation cavity reduces the diffusion of heat to other areas inside the shell, preventing heat accumulation from affecting other components around the equipment. For example, during long-term operation, aging or failure of surrounding electrical circuits due to heat accumulation can be avoided. The one-way valve in the ventilation and heat dissipation duct ensures that the air and the air in the insulation cavity flow out from the exhaust fan in one direction, achieving directional heat dissipation, ensuring the orderly progress of the heat dissipation process, and further improving the stability and reliability of the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the internal structure of the present invention as a whole;

[0021] Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the housing in the present invention;

[0023] Figure 4 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 5 It is a schematic diagram of the structure of the fin type heat exchange part in the present invention.

[0025] 1. Shell; 2. Installation isolation frame; 3. Charging station equipment; 4. Ventilation and heat dissipation duct; 5. Air cooler; 6. First main pipe; 61. First air inlet pipe; 62. Second air inlet pipe; 7. First liquid tank; 711. First one-way valve; 71. First liquid pipe; 8. Fin-type heat exchange unit; 81. Heat exchange pipe; 82. First heat dissipation fin; 9. Second liquid tank; 91. Second liquid pipe; 911. Second one-way valve; 10. Circulation pump; 101. Third liquid pipe; 100. Insulation chamber; 11. Fourth liquid pipe; 12. Exhaust fan; 131. Second main pipe; 132. First air outlet pipe; 133. Third air outlet pipe; 14. Contact sleeve; 141. Insulation frame; 142. Silicone thermal conductive block; 143. Second heat dissipation fin; 15. Door body; 151. Ventilation filter; 16. U-shaped blocking block. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Embodiment 1:

[0028] This embodiment provides a charging station external circulation heat dissipation device, please refer to Figure 1-Figure 5 The external circulation heat dissipation device of the charging station of the present invention is mainly composed of the following key parts:

[0029] Charging station body: It consists of a solid shell 1 and the charging station equipment 3 installed inside it. The shell 1 is made of high-strength metal materials, such as aluminum alloy, which has good mechanical strength and certain heat dissipation performance, and can provide reliable physical protection for the internal equipment. The charging station equipment 3 includes core components such as charging piles and charging modules. During the charging process, a large amount of heat will continue to be generated, and it is the focus of heat dissipation.

[0030] External channel heat dissipation component: The core component is the ventilation and heat dissipation duct 4 installed on the outside of the shell 1, which is made of corrosion-resistant and heat-conducting materials, such as galvanized steel plates. The ventilation and heat dissipation duct 4 is provided with an air inlet port and an air outlet port. The air inlet port is equipped with a cold air blower 5. The cold air blower 5 adopts a high-performance axial flow fan, which can generate a stable and strong low-temperature airflow and provide a cold source for the entire heat dissipation system. The exhaust fan 12 is installed at the air outlet port. The exhaust fan 12 adopts a centrifugal fan, which can effectively promote the rapid flow of air in the ventilation and heat dissipation duct 4 and ensure that the heat can be discharged in time.

[0031] In addition, a first main pipe 6 is provided at the air outlet end of the air cooler 5 inside the ventilation and heat dissipation duct 4, and a first air inlet pipe 61 and a second air inlet pipe 62 are connected to the first main pipe 6. The other end of the second air inlet pipe 62 faces the flow direction of the ventilation and heat dissipation duct 4, and the other end of the first air inlet pipe 61 extends into the insulation cavity 100, and is used to introduce part of the cold air blown out by the air cooler 5 into the insulation cavity 100, so as to enhance the heat dissipation effect in the insulation cavity 100.

[0032] A second main pipe 131 is provided inside the ventilation and heat dissipation duct 4 at the air inlet end of the exhaust fan 12, and the second main pipe 131 is connected to a first air outlet pipe 132 and a third air outlet pipe 133. The other end of the first air outlet pipe 132 faces the flow direction of the ventilation and heat dissipation duct 4, and the other end of the third air outlet pipe 133 extends into the insulation cavity 100. A third one-way valve is installed on the first air outlet pipe 132, and a fourth one-way valve is installed on the third air outlet pipe 133. The third one-way valve makes the ventilation direction of the first air outlet pipe 132 face the second main pipe 131, and the fourth one-way valve makes the ventilation direction of the third air outlet pipe 133 face the second main pipe 131. In this way, it can be ensured that the air in the ventilation and heat dissipation duct 4 and the air in the insulation cavity 100 flow out from the exhaust fan 12 in one direction, maintain the directional flow of air, and optimize the heat dissipation effect.

[0033] Circulating heat exchange assembly: including a finned heat exchanger, which is installed inside the ventilation and heat dissipation duct 4 and is composed of a plurality of closely and evenly arranged heat exchange tubes 81. The heat exchange tubes 81 are made of copper tubes with excellent thermal conductivity. Adjacent heat exchange tubes 81 are connected by pipes to form an efficient heat exchange channel. The surface of the heat exchange tube 81 is connected with a first heat dissipation fin 82, which is made of aluminum and is tightly combined with the heat exchange tube 81 through a precision welding process, which greatly increases the heat exchange area, can quickly and effectively exchange heat with the air flowing in the ventilation and heat dissipation duct 4, and significantly improve the heat dissipation efficiency.

[0034] Multiple contact pieces with heat-conducting medium (coolant) injected inside: The contact piece is a contact sleeve 14, and its outer side is connected to an insulation frame 141. The insulation frame 141 is made of high-performance insulation material, such as ceramic fiber, which can effectively isolate heat conduction. The insulation frame 141 is fixedly connected to the installation isolation frame 2. One end of the contact sleeve 14 is located on the inner side of the installation isolation frame 2 and is in close contact with the heating end of the charging station equipment 3 to ensure that heat can be efficiently transferred. The other end of the contact sleeve 14 is located in the insulation cavity 100, and one end inside the insulation cavity 100 is connected to a plurality of second heat dissipation fins 143. The second heat dissipation fins 143 are also made of aluminum material, which can further increase the heat dissipation area of ​​the contact sleeve 14 in the insulation cavity 100 and improve the heat dissipation effect. The contact sleeve 14 is connected to a first liquid pipe 71 and a second liquid pipe 91. The other end of the first liquid pipe 71 is connected to the first liquid tank 7, and a first one-way valve 711 is installed at the end close to the contact sleeve 14 to ensure that the liquid can only flow from the contact sleeve 14 to the first liquid tank 7; the other end of the second liquid pipe 91 is connected to the second liquid tank 9, and a second one-way valve 911 is installed at the end close to the contact sleeve 14 to ensure that the liquid can only flow from the contact sleeve 14 to the second liquid tank 9.

[0035] Heat transfer medium circulation part: including a circulation pump 10, a first liquid tank 7 and a second liquid tank 9. The circulation pump 10 can be a centrifugal pump with high flow and high head. The input end of the circulation pump 10 is connected to the inside of the second liquid tank 9 through a pipeline, and the output end is connected to the heat exchange tube 81 at the head end of the finned heat exchanger through the third liquid pipe 101. The heat exchange tube 81 at the tail end of the finned heat exchanger is connected to the fourth liquid pipe 11, and the other end of the fourth liquid pipe 11 is connected to the first liquid tank 7. Under the action of the circulation pump 10, the heat transfer medium circulates continuously and stably between the contact sleeve 14, the circulation liquid pipe part and the finned heat exchanger, realizing efficient heat transfer and exchange.

[0036] Specifically, in this embodiment, taking a medium-sized charging station as an example, the shell 1 of the charging station body can be 5 meters long, 3 meters wide, and 2.5 meters high, and is welded with an aluminum alloy plate with a thickness of 3 mm. The installation isolation frame 2 is installed inside the shell 1, and its material is a ceramic fiberboard with a thickness of 2 cm, which effectively isolates the charging station equipment 3 from other components to prevent heat diffusion. The ventilation and heat dissipation duct 4 is a circular galvanized steel plate duct with a diameter of 30 cm. The air cooler 5 installed at its air inlet port has a power of 2000 watts, which can generate sufficient low-temperature airflow. The exhaust fan 12 at the air outlet port has a power of 1500 watts, which can ensure the rapid circulation of air in the ventilation and heat dissipation duct 4. The heat exchange tube 81 of the finned heat exchange part 8 has a diameter of 2 cm, and the spacing between adjacent heat exchange tubes 81 is 3 cm. The first heat dissipation fin 82 has a thickness of 2 mm and a height of 5 cm, and is connected to the heat exchange tube 81 by tight welding. The silicone heat conductive block 142 of the contact sleeve 14 fits tightly with the heating end of the charging station equipment 3, and the contact area reaches 100 square centimeters. The flow rate of the circulation pump 10 is 50 liters / minute and the head is 15 meters.

[0037] When the charging station device 3 is operating normally, the air cooler 5, the circulating pump 10 and the exhaust fan 12 are started at the same time. The heat generated by the charging station device 3 is quickly transferred to the contact sleeve 14 through the silicone heat conductive block 142, and then flows to the first liquid tank 7 and the second liquid tank 9 through the first liquid pipe 71 and the second liquid pipe 91 respectively. The circulating pump 10 extracts the heat transfer medium in the second liquid tank 9 and transports it to the heat exchange tube 81 of the finned heat exchange part 8 through the third liquid pipe 101. Under the action of the cold air flowing in the ventilation and heat dissipation duct 4, the heat is efficiently taken away, and the cooled heat transfer medium returns to the first liquid tank 7 through the fourth liquid pipe 11, realizing stable circulation heat dissipation.

[0038] At the same time, the cold air blown by the air cooler 5 circulates in the ventilation and heat dissipation duct 4, not only taking away the heat on the finned heat exchange part 8 and the contact sleeve 14, but also flowing into the insulation cavity 100 through the first air inlet pipe 61, further enhancing the heat dissipation effect in the insulation cavity 100, while improving the heat dissipation efficiency with the help of the second heat dissipation fins 143 on the contact sleeve 14.

[0039] Example 2

[0040] This embodiment is optimized and expanded on the basis of embodiment 1. The heat dissipation device is adaptively adjusted in response to different ambient temperatures and changes in the load of the charging station equipment 3. When the ambient temperature rises by 10°C and the load of the charging station equipment 3 increases by 30%, the power of the air cooler 5 is automatically adjusted to 2500 watts through the intelligent control PLC controller system of the prior art (electrically or wirelessly connected to the components related to this application), the flow rate of the circulating pump 10 is increased to 60 liters / minute, and the diameter of the ventilation and heat dissipation duct 4 is expanded to 35 cm. After long-term operation monitoring, it was found that under such harsh working conditions, the temperature of the charging station equipment 3 can still be stabilized within the safe operating temperature range. Compared with before adjustment, the maximum temperature of the equipment has been reduced by about 8°C, which fully verifies the adaptive adjustment ability and efficient heat dissipation performance of the heat dissipation device of the present invention.

[0041] When the present application is used specifically, a large amount of heat will be generated during the operation of the charging station device 3. At this time, the air cooler 5, the circulating pump 10 and the exhaust fan 12 are started synchronously.

[0042] In terms of heat transfer, the heat generated by the heating end of the charging station device 3 is first absorbed by the contact sleeve 14. The silicone heat-conducting block 142 on the contact sleeve 14 is in close contact with the heating end of the charging station device 3 to ensure efficient heat transfer. After absorbing the heat, the contact sleeve 14 transfers the heat to the heat-conducting medium through the first liquid pipe 71 and the second liquid pipe 91, wherein the first liquid pipe 71 is controlled by the first one-way valve 711 to allow the heat-conducting medium to flow to the first liquid tank 7; the second liquid pipe 91 is controlled by the second one-way valve 911 to allow the heat-conducting medium to flow to the second liquid tank 9.

[0043] During the circulation of the heat transfer medium, the circulation pump 10 plays a key role. Its input end extracts the heat transfer medium from the second liquid tank 9 and transports it to the head end of the heat exchange tube 81 of the finned heat exchanger through the third liquid pipe 101. In the finned heat exchanger, the heat exchange tube 81 and the first heat dissipation fin 82 on its surface exchange heat with the cold air flowing in the ventilation and heat dissipation duct 4. The air flow in the ventilation and heat dissipation duct 4 is provided with a cold air source by the air cooler 5, and the exhaust fan 12 maintains the air circulation. The cold air takes away the heat on the heat transfer tube 81 and the first heat dissipation fin 82, so that the heat transfer medium flowing through the finned heat exchanger is cooled. The cooled heat transfer medium flows back to the first liquid tank 7 from the heat exchange tube 81 at the tail end of the finned heat exchanger through the fourth liquid pipe 11, completing a cycle.

[0044] In addition, when the cold air blown by the air cooler 5 circulates in the ventilation and heat dissipation duct 4, on the one hand, it directly takes away the heat on the finned heat exchange part 8 and the contact sleeve 14; on the other hand, part of the cold air is transported to the heat insulation cavity 100 through the first air inlet pipe 61 of the first main pipe 6 to further take away the heat. At the same time, the third air outlet pipe 133 on the second main pipe 131 located at the air inlet end of the exhaust fan 12 in the ventilation and heat dissipation duct 4 will also introduce part of the air into the heat insulation cavity 100, and under the action of the exhaust fan 12, the air in the heat insulation cavity 100 and the air in the ventilation and heat dissipation duct 4 flow out from the exhaust fan 12 in one direction, maintaining the directional flow of air and optimizing the heat dissipation effect. In the heat insulation cavity 100, the second heat dissipation fins 143 on the contact sleeve 14 can enhance the heat dissipation efficiency of the contact sleeve 14 in the heat insulation cavity 100.

[0045] The above description is only 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 in the protection scope of the present invention.

Claims

1. The external circulation heat dissipation device of the charging station is characterized by: include: A charging station body, the charging station body comprising a shell (1) and a charging station device (3) installed inside the shell (1); An external channel heat dissipation component comprises a ventilation and heat dissipation duct (4) installed outside a housing (1), the ventilation and heat dissipation duct (4) having an air inlet port and an air outlet port, an air cooler (5) being installed at the air inlet port of the ventilation and heat dissipation duct (4), and an exhaust fan (12) being installed at the air outlet port of the ventilation and heat dissipation duct (4); The circulating heat exchange component comprises a finned heat exchanger, a plurality of contact pieces with a heat-conducting medium injected therein, and a heat-conducting medium circulation part. The finned heat exchanger is installed inside a ventilation and heat dissipation duct (4) to exchange heat with air flowing in the ventilation and heat dissipation duct (4). The contact piece contacts the heat end generated by the charging station equipment (3). The plurality of contact pieces are connected to the finned heat exchanger through a circulating liquid pipeline part. The circulating liquid pipeline part is used to continuously circulate the heat-conducting medium between the contact piece, the circulating liquid pipeline part, and the finned heat exchanger.

2. The external circulation heat dissipation device for a charging station according to claim 1, characterized in that: The fin-type heat exchanger comprises a plurality of heat exchange tubes (81) arranged in an array, adjacent heat exchange tubes (81) are connected via pipelines, and the surfaces of the heat exchange tubes (81) are connected to first heat dissipation fins (82).

3. The external circulation heat dissipation device for a charging station according to claim 2 is characterized in that: The contact member comprises a contact sleeve (14); the circulating liquid pipeline section comprises a first liquid tank (7) and a second liquid tank (9); the heat transfer medium circulation section comprises a circulating pump (10); the contact sleeve (14) is connected to a second liquid pipe (91); the other end of the second liquid pipe (91) is connected to the second liquid tank (9); the input end of the circulating pump (10) is connected to the inside of the second liquid tank (9) through a pipeline; the output end of the circulating pump (10) is connected to a heat exchange tube (81) at the head end of the finned heat exchange section (8) through a third liquid pipe (101); the heat exchange tube (81) at the tail end of the finned heat exchange section (8) is connected to a fourth liquid pipe (11); the contact sleeve (14) is connected to a first liquid pipe (71); the other end of the first liquid pipe (71) is connected to the first liquid tank (7); the other end of the fourth liquid pipe (11) is connected to the first liquid tank (7).

4. The external circulation heat dissipation device for a charging station according to claim 3 is characterized in that: A second one-way valve (911) is installed at one end of the second liquid passage tube (91) close to the contact sleeve (14), and the second one-way valve (911) enables the liquid in the second liquid passage tube (91) to flow from one end of the second liquid passage tube (91) close to the contact sleeve (14) to the other end of the second liquid tank (9). A first one-way valve (711) is installed at one end of the first liquid passage tube (71) close to the contact sleeve (14), and the first one-way valve (711) enables the liquid in the first liquid passage tube (71) to flow from one end of the first liquid passage tube (71) close to the contact sleeve (14) to the other end of the first liquid tank (7).

5. The external circulation heat dissipation device for a charging station according to claim 4, characterized in that: The shell (1) is internally connected to an installation isolation frame (2); an insulation cavity (100) is formed between the outer wall of the installation isolation frame (2) and the inner wall of the shell (1); a U-shaped blocking block (16) is fixedly connected to the front of the insulation cavity (100); the U-shaped blocking block (16) is used to block the insulation cavity (100); the charging station equipment (3) is located on the inner side of the installation isolation frame (2); the circulating liquid pipeline is located on the outer side of the installation isolation frame (2); the outer side of the contact sleeve (14) is connected to an insulation frame (141); the contact sleeve (14) is fixedly connected to the installation isolation frame (2); one end of the contact sleeve (14) is located on the inner side of the installation isolation frame (2); and the other end of the contact sleeve (14) is located in the insulation cavity (100).

6. The external circulation heat dissipation device for a charging station according to claim 5, characterized in that: A first main pipe (6) is provided inside the ventilation and heat dissipation duct (4) at the air outlet end of the air cooler (5); the first main pipe (6) is connected to a second air inlet pipe (62) and a first air inlet pipe (61); the other end of the second air inlet pipe (62) faces the flow direction of the ventilation and heat dissipation duct (4); the other end of the first air inlet pipe (61) extends into the heat insulation cavity (100); a second main pipe (131) is provided inside the ventilation and heat dissipation duct (4) at the air inlet end of the exhaust fan (12); the second main pipe (131) is connected to a first air outlet pipe (132) and a third air outlet pipe (133); the other end of the first air outlet pipe (132) faces the flow direction of the ventilation and heat dissipation duct (4); the other end of the third air outlet pipe (133) extends into the heat insulation cavity (100).

7. The external circulation heat dissipation device for a charging station according to claim 6, characterized in that: A third one-way valve is installed on the first air outlet pipe (132), and a fourth one-way valve is installed on the third air outlet pipe (133); the third one-way valve enables the ventilation direction of the first air outlet pipe (132) to be toward the second main pipe (131), and the fourth one-way valve enables the ventilation direction of the third air outlet pipe (133) to be toward the second main pipe (131).

8. The external circulation heat dissipation device for a charging station according to claim 7, characterized in that: One end of the contact sleeve (14) located inside the heat-insulating cavity (100) is connected to a plurality of second heat-dissipating fins (143), and the other end of the contact sleeve (14) is connected to a silicone heat-conducting block (142) in contact with the heating end of the charging station device (3).

9. The external circulation heat dissipation device for a charging station according to claim 8, characterized in that: A door body (15) is hinged on the front of the shell (1), a ventilation filter screen (151) is installed on the door body (15), and a fan is installed on the shell (1).

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