High-voltage switchgear

Abstract

The invention belongs to the field of high-voltage switch equipment, and particularly relates to high-voltage switch equipment which comprises a box body and a heating element arranged in the box body, a radiator is arranged on the box wall of the box body, at least part of the radiator is located outside the box body, and the high-voltage switch equipment further comprises a heat pipe. The evaporation end of the heat pipe is in heat conduction connection with the heating element, the condensation end of the heat pipe is located in the box body and keeps an insulation distance with the box wall, the lower end of the constraint pipe covers at least part of the outer side of the condensation end of the heat pipe, and the upper end of the constraint pipe extends to the position where the radiator is located. Therefore, hot air flow formed at the condensation end of the heat pipe can flow to the radiator under the constraint and guide of the constraint pipe, and rapid and efficient heat dissipation is achieved.

Description

Technical Field

[0001] The invention belongs to the field of switchgear for high-voltage lines, and in particular relates to a high-voltage switchgear. Background Art

[0002] When high-voltage switchgear such as high-current switchgear, gas-filled cabinets, and generator circuit breakers are working, the internal circuit breakers, busbars and other heating elements will generate a lot of heat due to the large current flowing through them. To ensure the safe operation of the equipment, the temperature of heating elements such as circuit breakers and busbars cannot be higher than the ambient temperature by more than 75°C. Therefore, a cooling system needs to be set up in the high-voltage switchgear.

[0003] The Chinese invention patent application with application publication number CN117543380A and application publication date February 9, 2024 discloses a cooling device for an inflatable cabinet and an inflatable cabinet, wherein a first fan and a second fan are installed on the box wall of the inflatable cabinet, and the second fan is powered and rotated by the secondary side of the current transformer. The rotating shaft of the second fan is used as a driving shaft to drive the first fan to rotate and supply air, and the first fan supplies air into the box to achieve cooling inside the box. This cooling method depends on the normal operation of the second fan. Once the second fan fails and cannot drive the first fan to rotate, the heat dissipation device will not work, resulting in an increase in the temperature of the switchgear and a dangerous situation. Therefore, natural heat dissipation becomes the best choice for the stable operation of high-current and high-voltage switchgear.

[0004] A Chinese invention patent application with application publication number CN104701778A and application publication date June 10, 2015 discloses a self-cooling high-voltage AC metal-enclosed switchgear, in which a circuit breaker heat pipe radiator is installed at the static outlet end of the circuit breaker. When the device is in operation, the heat on the static conductive rod of the vacuum arc chamber in the circuit breaker is dissipated to the air in the circuit breaker chamber through the circuit breaker heat pipe radiator connected thereto. At the same time, a top heat pipe radiator is installed on the pressure relief channel cover plate at the top of the circuit breaker chamber. The evaporation end of the top heat pipe radiator is located in the circuit breaker chamber, and the condensation end extends to the outside of the circuit breaker chamber. The heat in the air in the circuit breaker chamber is conducted to the outside by the top heat pipe radiator to achieve cooling of the equipment.

[0005] The above-mentioned method of cooling by natural heat dissipation effectively avoids the unreliability caused by cooling with the help of fans. However, since the static conductive rod of the arc extinguishing chamber carries a high voltage when working, the heat pipe radiator of the circuit breaker connected thereto will also carry a high voltage. In order to ensure insulation, a large insulation distance needs to be maintained between the heat pipe radiator of the circuit breaker and the walls of the cabinet, which increases the distance that the hot air flow formed at the condensation end of the heat pipe radiator of the circuit breaker flows to the top heat pipe radiator (i.e., the radiator on the box wall). As a result, the hot air flow is easily dispersed in the equipment box during the process of flowing to the radiator on the box wall, and cannot be concentrated on contacting the radiator on the box wall for heat dissipation, affecting the heat dissipation rate of the heat dissipation system. Summary of the invention

[0006] The object of the present invention is to provide a high-voltage switchgear to solve the technical problem of low cooling efficiency of high-voltage switchgear using natural heat dissipation in the prior art.

[0007] To achieve the above-mentioned purpose, the technical solution of the high-voltage switchgear provided by the present invention is:

[0008] A high-voltage switchgear comprises a box body and a heating element arranged in the box body, a radiator is arranged on the box wall of the box body, and the radiator is at least partially located outside the box body. The high-voltage switchgear also comprises a heat pipe, the evaporation end of the heat pipe is thermally connected to the heating element, and the condensation end is located in the box body and keeps an insulation distance from the box wall. The high-voltage switchgear also comprises a restraining tube made of insulating material, the lower end of the restraining tube covers at least part of the outside of the condensation end of the heat pipe, and the upper end extends to the position of the radiator, so that the hot air flow formed at the condensation end of the heat pipe can flow to the radiator under the restraint and guidance of the restraining tube.

[0009] As a further improvement, an air outlet is provided on the box wall of the box body, and the radiator includes a heat dissipation box and heat dissipation fins arranged on the outer side wall of the heat dissipation box. The heat dissipation box is fixed outside the box body and has a box opening connected to the air outlet.

[0010] As a further improvement, the upper end of the restraining tube is fixed on the box wall and the inner cavity of the restraining tube is communicated with the air outlet.

[0011] As a further improvement, a mounting block is arranged on the inner wall surface of the box wall outside the air outlet, and a threaded hole is opened on the side of the mounting block. The constraint tube cover is arranged on the outside of the mounting block and the air outlet, and the upper end surface of the constraint tube is abutted against the inner wall surface of the box wall. The constraint tube is fixed to the mounting block by screws that penetrate through itself and cooperate with the threaded holes.

[0012] As a further improvement, the radiator is located on the top wall of the box body, and the restraining pipe extends up and down.

[0013] As a further improvement, the heating element includes a static end of the arc extinguishing chamber, the axis of the arc extinguishing chamber is horizontally arranged in the box, the static end of the arc extinguishing chamber is connected to the static end outlet seat, the static end outlet seat is cylindrical and coaxially connected to the arc extinguishing chamber, the static end of the arc extinguishing chamber is provided with an insertion hole extending along the axis of the arc extinguishing chamber, the bottom of the static end outlet seat is provided with a through hole aligned with the insertion hole, the heat pipe is bent, the evaporation end passes through the through hole and is inserted in the insertion hole to make thermal contact with the hole wall of the insertion hole, and the cylinder wall of the static end outlet seat is provided with a through hole for the condensation end to extend outward.

[0014] As a further improvement, a fixing block is fixed at the through hole, and the heat pipe is fixed to the side of the fixing block by a saddle clamp.

[0015] As a further improvement, the condensation end of the heat pipe cantilevers upward, there are multiple heat pipes and they are arranged in at least one row, and the distance between the condensation ends of two adjacent heat pipes in one row gradually increases from bottom to top.

[0016] As a further improvement, a heat dissipation structure is further provided on the box body outside the area where the radiator is located, so that the heat in the hot air flow in the box body that has not entered the restraining tube can be conducted to the outside through the heat dissipation structure.

[0017] As a further improvement, the top of the box body is a prism structure, the radiator is arranged on the top table of the prism structure, and the heat dissipation structure is arranged on the side of the prism structure.

[0018] The beneficial effect is: the medium and high voltage switchgear of the present invention is improved on the basis of the medium and high voltage switchgear in the prior art, and belongs to an improved invention. On the basis of setting the heat pipe and the heating element in contact with each other for heat conduction, it emphasizes setting an insulating constraint tube between the condensation end of the heat pipe and the radiator on the box body. After the condensation end of the heat pipe releases heat to heat the surrounding gas into high-temperature gas, the high-temperature gas rises to form a hot air flow, which can be constrained and guided by the constraint tube, so that the hot air flow can flow to the radiator more concentratedly and quickly, and the heat is conducted to the external environment through the radiator, ensuring that the large-capacity and high-current high-voltage switchgear has a high heat dissipation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the high voltage switchgear of the present invention;

[0020] Figure 2 A schematic diagram of the structure of a heat pipe of a medium- and high-voltage switchgear of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the cooperation between the heat pipe and the circuit breaker of the high-voltage switchgear of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the cooperation between the heat pipe and the circuit breaker of the high-voltage switchgear of the present invention from another perspective;

[0023] Figure 5 It is a schematic diagram of the structure in which the restraining tube of the high-voltage switchgear of the present invention is installed on the top wall of the box body;

[0024] Figure 6 It is a structural schematic diagram of the heat dissipation box of the medium and high voltage switchgear of the present invention;

[0025] Figure 7 A schematic diagram of the internal structure of the heat dissipation box of the high-voltage switchgear of the present invention;

[0026] Figure 8It is a schematic diagram of the structure of the heat sink plate constituting the heat sink box of the medium and high voltage switchgear of the present invention;

[0027] Fig. 9 A schematic structural diagram of a restraining tube of a high-voltage switchgear according to the present invention.

[0028] Description of reference numerals:

[0029] 1. Box body; 2. Arc extinguishing chamber; 3. Static end outlet socket; 4. Heat pipe; 5. Heat pipe cooling fin; 6. Through hole; 7. Air outlet; 8. Heat dissipation box; 9. Restraint pipe; 10. Fin; 11. Plate body; 12. Cooling fin; 13. Avoidance channel; 14. Fixing block; 15. Riding card; 16. Flange; 17. Thin side wall; 18. Thick side wall; 19. Mounting block. DETAILED DESCRIPTION

[0030] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0031] The present invention is based on the improvement of the large current and high voltage switch equipment in the prior art, and is mainly used to solve the technical problem of low heat dissipation and cooling efficiency of the existing large current and high voltage switch equipment.

[0032] The scheme principle of the medium and high voltage switchgear of the present invention is: for the working elements which are fixedly arranged in the box body and carry large current when working, a heat pipe is arranged and the evaporation end of the heat pipe is in contact with the corresponding working element to ensure that the heat generated when the working element carries large current can be quickly transferred to the heat pipe, and the condensation end of the heat pipe is located in the box body and keeps an insulation distance from the box body wall to avoid discharge between the heat pipe and the box body wall, and at the same time, a restraining tube of insulating material is arranged in the box body, and the upper port of the restraining tube is connected with the pipeline heat dissipation structure on the top wall of the box body, and the lower port is arranged at the position of the condensation end of the heat pipe, so that when the air around the cold end of the heat pipe absorbs heat and turns into hot air flow and rises, it can flow to the pipeline heat dissipation structure under the restraint and guidance of the restraining tube, thereby realizing high-efficiency heat dissipation and cooling.

[0033] Embodiment 1 of the high voltage switchgear of the present invention:

[0034] The high-voltage switchgear includes a housing and working elements fixed in the housing for conducting large currents. These working elements are heating elements and will generate a large amount of heat when conducting large currents. In fact, since the large-current high-voltage switchgear is used to achieve the conduction and disconnection of the circuit, in addition to the fixed heating elements, there are also movably arranged heating elements in the housing. For example, the static end of the arc extinguishing chamber is a fixed heating element, and the moving end is a movably arranged heating element. In addition, the fixed heating elements include busbars and other working elements.

[0035] In this embodiment, the high-voltage switchgear is specifically a large-capacity generator circuit breaker as an example for description. In other embodiments, it can also be a high-current switch cabinet or an inflatable cabinet. Figure 1 As shown, the generator circuit breaker includes a box body 1, a circuit breaker is arranged in the box body 1, and the circuit breaker includes an arc extinguishing chamber 2. The static end of the arc extinguishing chamber 2 is a working component fixedly arranged in the box body 1, and the dynamic end is movable. In the closed state, the dynamic end and the static end are in contact to conduct a large current, and both the static end and the dynamic end will generate a lot of heat. The specific structure of the arc extinguishing chamber 2 belongs to the prior art and will not be described here.

[0036] The static end of the arc extinguishing chamber 2 is also provided with a static end outlet seat 3, and a heat pipe 4 is provided corresponding to the static end of the arc extinguishing chamber 2. Specifically, the axis of the arc extinguishing chamber 2 is arranged horizontally, and the static end outlet seat 3 is a cylinder with a cylinder bottom, and the cylinder bottom of the static end outlet seat 3 is fixed to the static end of the arc extinguishing chamber 2 so that the static end outlet seat 3 and the static end of the arc extinguishing chamber 2 conduct current. Figure 2 As shown, the heat pipe 4 is an L-shaped bending structure, and a heat pipe heat dissipation fin 5 is arranged at the condensing end, an insertion hole is opened along the axial direction of the static end conductive rod of the static end of the arc extinguishing chamber 2, and a through hole aligned with the insertion hole is opened on the bottom of the static end outlet seat 3. The evaporation end of the heat pipe 4 is inserted into the insertion hole through the through hole, so that the evaporation end of the heat pipe 4 is in contact with the static end of the arc extinguishing chamber 2, so that the heat generated when the arc extinguishing chamber 2 conducts a large current can be quickly conducted to the heat pipe 4. Figure 3 and Figure 4 As shown, a through hole 6 is opened on the wall of the static end outlet seat 3, and the condensing end of the heat pipe 4 extends upward from the static end outlet seat 3 through the through hole 6. To prevent high voltage breakdown discharge, an insulation distance is maintained between the condensing end of the heat pipe 4 and the box wall of the box body 1.

[0037] The box body 1 has a radiator. Specifically, the top of the box body 1 is a prism structure, and the top wall of the prism structure constitutes the top wall of the box body 1. Figure 5 As shown, an air outlet 7 is provided on the top wall of the prism structure, and the radiator includes a heat dissipation box 8 arranged on the top wall of the box body 1 and heat dissipation fins located on the outer wall of the heat dissipation box 8. A flange 16 is welded to the box opening of the heat dissipation box 8, and the flange 16 is connected to the air outlet 7. To ensure air tightness, a sealing ring is provided between the flange 16 and the top wall of the box body 1. In this way, the radiator is located outside the box body 1. In this embodiment, two air outlets 7 are provided, and correspondingly, two heat dissipation boxes 8 and two restraining tubes 9 are provided. In other embodiments, the number of heat dissipation boxes can be adaptively increased or decreased, and the number of air outlets and restraining tubes can correspond to the number of heat dissipation boxes.

[0038] The air around the heat pipe 4 is heated by the condensation end of the heat pipe 4 to form an ascending hot air flow. In order to prevent discharge, the condensation end of the heat pipe 4 is kept at an insulating distance from the box wall, which makes it difficult for the hot air flow to be concentrated and flow quickly to the heat dissipation structure. In order to enable the hot air flow to be concentrated and flow quickly to the heat dissipation structure, a constraint tube 9 made of insulating material is also arranged in the box body 1. The upper end of the constraint tube 9 extends to the position of the radiator. In this embodiment, it is connected to the air outlet 7, and the lower end is covered outside the condensation end of the heat pipe 4. In this way, the hot air flow formed at the condensation end of the heat pipe 4 can flow quickly to the radiator under the constraint and guidance of the constraint tube 9, and enter the heat dissipation box 8 through the air outlet 7. The heat is finally conducted to the outside through the heat dissipation box 8.

[0039] Based on the above structure, the heat generated when the arc extinguishing chamber 2 conducts a large current can be quickly transferred to the heat pipe 4, and finally transferred to the surrounding gas through the condensation section of the heat pipe 4 to form a hot air flow, and the hot air flow can be concentrated and quickly flow to the radiator to transfer the heat to the outside, so as to achieve the purpose of efficient heat dissipation and cooling. Those skilled in the art can know that according to actual needs, heat pipes can be flexibly set for all or part of the heating elements fixed in the box, such as only setting heat pipes for the static end of the arc extinguishing chamber, only setting heat pipes for the busbar in the box, or setting heat pipes for both the static end and the busbar of the arc extinguishing chamber.

[0040] The structure of the radiator is as follows Figure 6 and Figure 7 As shown, the heat sink 8 has a box opening at the bottom, and the other five side walls are provided with fins 10 inside and outside. The two sides of the fins 10 are wavy to increase their surface area. The fins 10 located inside the box are used to increase the heat absorption area inside the heat sink 8, and are heat absorption fins. The fins 10 located outside the box are used to increase the heat dissipation area outside the heat sink 8, and are heat dissipation fins. The side walls of the heat sink 8 are Figure 8 The heat sink shown is spliced ​​together, and the heat sink includes a plate body 11, fins 10 are arranged on both sides of the plate body 11, and the end face of one end of the plate body 11 is an inclined surface, so that when the two heat sinks are butt-welded to form the side wall of the heat sink 8, a V-shaped butt welding groove can be formed at the splicing to ensure the sealing of the heat sink 8. The other end of the plate body 11 is a flat end face, and the height of the part of the fin on the plate body 11 used to form the heat absorbing fin close to the flat end face is gradually reduced to prevent the heat absorbing fins from interfering with the adjacent box walls of the heat sink 8. In other embodiments, under the premise that the heat dissipation capacity meets the requirements, the fins may not be arranged inside the heat sink.

[0041] Since there are many heating elements in the box 1, cooling fins are also arranged on the outside of the static end outlet seat and the dynamic end outlet seat. Therefore, the hot air flow in the box cannot all enter the constraint tube 9. In view of this, in this embodiment, a heat dissipation structure is also arranged on the side wall of the prism structure. The heat dissipation structure is specifically a heat dissipation fin 12. The heat in the hot air flow in the box 1 that does not enter the constraint tube 9 can be conducted to the outside through the heat dissipation fin 12. In this way, the radiator and the heat dissipation structure are arranged on the prism structure, which can increase the layout area of ​​the heat dissipation structure, thereby improving the heat dissipation and cooling efficiency of the generator circuit breaker. In addition, since the flow direction of the airflow around the generator circuit breaker is unstable, the above structure allows the radiator and the heat dissipation structure to be arranged up and down, increasing the probability of the external ambient air contacting the radiator and the heat dissipation structure. In other embodiments, the top of the box can be a flat structure, and the top is the top wall, and the heat dissipation fins are arranged on the top wall. The heat dissipation structure can also be a plurality of heat pipes arranged on the top of the box, with the evaporation end of these heat pipes located inside the box and the condensation end located outside the box. At this time, the upper pipe mouth of the constraint tube is against the top wall, enclosing the evaporation end of some heat pipes of the heat dissipation structure within the constraint tube.

[0042] In order to facilitate the installation of the heat pipe 4 on the arc extinguishing chamber 2, an avoidance channel 13 connected to the through hole is also opened on the wall of the tube at the tube mouth of the static end outlet seat 3, so that the heat pipe 4 can enter the through hole 6 through the avoidance channel 13 along the axial extension direction of the static end outlet seat 3. In order to fix the heat pipe 4, a fixing block 14 is also fixed at the through hole 6. The fixing block 14 spans the through hole 6 along the circumference of the static end outlet seat 3, and both ends are fixed to the wall of the static end outlet seat 3 by screws. In this embodiment, six heat pipes 4 are arranged corresponding to the static end of the arc extinguishing chamber 2. The six heat pipes 4 are divided into two rows and fixed on both sides of the fixing block 14 in a row of three. The heat pipe 4 is fixed to the fixing block 14 by fixing the riding clip 15 on the side wall of the fixing block 14. For the number of heat pipes, in other embodiments, it can be adaptively increased or decreased according to actual needs, and can be only one or more than six. The fixing block can also span the through hole 6 along the axial direction of the arc extinguishing chamber.

[0043] In this embodiment, the outer circumference of the static end outlet seat 3 is a polygon, and the hole 6 is opened on one of the planes. The shape of the fixed block 14 is adapted to the outer circumference of the cylinder of the static end outlet seat 3, and it is a three-section bending structure, which is arranged across three planes on the outer circumference of the static end outlet seat 3. Four threaded holes are arranged on each side of the fixed block 14, two are located on the two end sections of the fixed block 14, and two are located on the middle section. The adjacent ends of two adjacent riding cards 15 share a threaded hole, so that three independent riding cards 15 can be installed. Because the fixed block 14 is a bending structure, there is an angle between the groove axes of the three riding cards, so that the distance between the condensation ends of the three heat pipes 4 on the same side gradually increases, and the heat dissipation rate of the condensation end is improved. In other embodiments, the outer circumference of the static end outlet seat 3 can also be a circular surface, and the corresponding fixed block is an arc block. In other embodiments, the arc extinguishing chamber can also be arranged vertically in the box body. At this time, the heat pipe is a straight pipe structure, extending upward through the barrel mouth of the static end outlet seat.

[0044] In this embodiment, the structure of the restraining tube 9 is as follows Fig. 9 As shown, it is a rectangular tube, including a pair of opposite thin side walls 17 and a pair of oppositely arranged thick side walls 18, the thin side walls 17 and the thick side walls 18 are fixed together by threaded fasteners of insulating material, so that the constraint tube 9 is designed as a split assembly structure, which can reduce the difficulty of manufacturing the constraint tube 9. Specifically, threaded holes are provided at intervals on the two end surfaces of the thick side wall 18 in the width direction, the thin side wall 17 is matched with the side surface of the thick side wall 18 in the width direction, and a mounting hole aligned with the threaded hole is provided on the thin side wall 17, and the mounting hole is a light hole. The thick side wall 18 and the thin side wall 17 are assembled together to form the constraint tube 9 by screwing the threaded fasteners of insulating material into the mounting hole and the threaded hole. In order to improve the convenience of assembly operation, a step structure is provided at the position where the thin side wall 17 and the thick side wall 18 are matched, and the width dimension of the step surface is equivalent to the thickness dimension of the thick side wall 18, so that the thin side wall 17 can be positioned and matched with the thick side wall 18 through the step structure during assembly, so as to facilitate the alignment of the threaded hole and the mounting hole. In other embodiments, the restraint tube may also be a round tube. Structurally, the restraint tube may also be an integrated structure. In this case, a corresponding mold needs to be designed to manufacture the integrated restraint tube.

[0045] In order to install the restraining tube 9, a mounting structure for fixing the restraining tube 9 is provided on the inner side of the top wall of the box body 1, such as Figure 5 As shown, the mounting structure in this embodiment includes a mounting block 19 fixedly mounted on the inner side of the top wall, and the outer side of the mounting block 19 has a threaded hole. Correspondingly, a matching hole penetrating the constraint tube wall is provided at the top of the constraint tube 9. The matching hole is a light hole, and the constraint tube 9 is fixed to the top wall by screwing screws in the threaded hole and the matching hole. In other embodiments, the constraint tube can also be fixed to the side wall of the box.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-voltage switchgear, comprising a box and a heating element arranged in the box, a radiator is arranged on the box wall of the box, and the radiator is at least partially located outside the box, and the high-voltage switchgear also includes a heat pipe, the evaporation end of the heat pipe is thermally connected to the heating element, and the condensation end is located in the box and maintains an insulation distance from the box wall, wherein: The high-voltage switchgear also includes a restraining tube made of insulating material, the lower end of which covers at least part of the outside of the condensation end of the heat pipe, and the upper end of which extends to the location of the radiator, so that the hot air flow formed at the condensation end of the heat pipe can flow to the radiator under the restraint and guidance of the restraining tube.

2. The high voltage switchgear according to claim 1, characterized in that: An air outlet is provided on the box wall of the box body. The radiator comprises a heat dissipation box and heat dissipation fins arranged on the outer side wall of the heat dissipation box. The heat dissipation box is fixed outside the box body and has a box opening communicated with the air outlet.

3. The high voltage switchgear according to claim 2, characterized in that: The upper end of the restraining tube is fixed on the box wall and the inner cavity of the restraining tube is communicated with the air outlet.

4. The high voltage switchgear according to claim 3, characterized in that: A mounting block is arranged on the inner wall surface of the box wall at the periphery of the air outlet, and a threaded hole is opened on the side of the mounting block. The constraint tube cover is arranged on the outside of the mounting block and the air outlet, and the upper end surface of the constraint tube abuts against the inner wall surface of the box wall. The constraint tube is fixed to the mounting block by screws that penetrate through itself and cooperate with the threaded holes.

5. The high voltage switchgear according to any one of claims 1 to 4, characterized in that: The radiator is located on the top wall of the box body, and the restraining pipe extends up and down.

6. The high voltage switchgear according to any one of claims 1 to 4, characterized in that: The heating element includes a static end of an arc extinguishing chamber, the axis of the arc extinguishing chamber is horizontally arranged in a box body, the static end of the arc extinguishing chamber is connected to a static end outlet seat, the static end outlet seat is cylindrical and coaxially connected to the arc extinguishing chamber, the static end of the arc extinguishing chamber is provided with an insertion hole extending along the axis of the arc extinguishing chamber, the bottom of the static end outlet seat is provided with a through hole aligned with the insertion hole, the heat pipe is bent, the evaporation end passes through the through hole and is inserted in the insertion hole to be in heat-conducting contact with the hole wall of the insertion hole, and the cylinder wall of the static end outlet seat is provided with a through hole for the condensation end to extend outward.

7. The high voltage switchgear according to claim 6, characterized in that: A fixing block is fixed at the through hole, and the heat pipe is fixed on the side surface of the fixing block through a riding clamp.

8. The high voltage switchgear according to claim 6, characterized in that: The condensation end of the heat pipe is cantilevered upward, and there are a plurality of heat pipes arranged in at least one row, and the distance between the condensation ends of two adjacent heat pipes in one row gradually increases from bottom to top.

9. The high voltage switchgear according to any one of claims 1 to 4, characterized in that: The box body is also provided with a heat dissipation structure outside the area where the radiator is located, so that the heat in the hot air flow in the box body that has not entered the restraining tube can be conducted to the outside through the heat dissipation structure.

10. The high voltage switchgear according to claim 9, characterized in that: The top of the box body is a prism structure, the radiator is arranged on the top table of the prism structure, and the heat dissipation structure is arranged on the side of the prism structure.

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