Vehicle direct current lightning arrester with built-in separation device

Abstract

The invention relates to the technical field of lightning arresters, and discloses a vehicle direct current lightning arrester with a built-in separation device, the vehicle direct current lightning arrester comprises an outer sleeve and a core body, the core body comprises an insulating tube, an electrode is arranged in the insulating tube, the electrode divides the interior of the insulating tube into an upper cavity and a lower cavity, the upper cavity is provided with a functional module, the functional module is used for realizing an overvoltage protection function, and the lower cavity is provided with a power supply. A separating device is arranged in the lower cavity and located on the upper portion of the lower cavity, a connecting hole communicated with the lower cavity is formed in the core body, a grounding end is arranged in the connecting hole, and the grounding end is connected with the separating device; according to the lightning arrester, when the insulating property of the upper cavity is completely lost due to a short-circuit fault, the accurate and reliable action of the separating device of the lower cavity can still be ensured when the fault occurs, the disconnection of a circuit is realized, the insulating property of the lower cavity can be kept after the action, and the risk of a secondary fault is avoided; as the disengagement device is limited in the lightning arrester, the adverse effect of scattered objects generated when the external disengagement device acts on the vehicle can be avoided.

Description

Technical Field

[0001] This application relates to the technical field of surge arresters, and in particular to a DC surge arrester for vehicles with a built-in disconnect device. Background Technology

[0002] DC surge arresters for vehicles are key protection devices for the DC power supply system of subway vehicles. Their core function is to limit the overvoltage amplitude caused by lightning, switching operations, and DC contact network faults, thereby protecting the external insulation of the vehicle's electrical equipment from damage. Under normal system voltage, the surge arrester exhibits a high-resistance state, with only microampere-level leakage current flowing through it, thus providing insulation from the system. When an overvoltage (lightning or switching overvoltage) occurs in the system, the surge arrester exhibits a low-resistance state, absorbing some of the overvoltage energy while limiting its amplitude, and simultaneously conducting the overvoltage as energy to the ground, thereby protecting the external insulation of the equipment connected in parallel from damage. Traditional power line surge arresters are usually equipped with disconnectors, whose function is to disconnect the circuit by triggering the internal operating element of the disconnector when a short-circuit fault occurs in the surge arrester through the power frequency follow current, thus preventing the fault from escalating.

[0003] However, during subway train operation, if the external disconnector of the surge arrester is triggered, the throwing of the disconnector lead and the resulting metal fragments and debris can damage surrounding electrical equipment, affecting train operation. Simply placing the disconnector inside the surge arrester presents new risks: when a short-circuit fault occurs in the surge arrester, the arc generated by the short-circuit current can burn the internal insulation components, causing surface carbonization and loss of insulation performance. Even if the disconnector successfully disconnects before the traction substation circuit breaker trips, it is ineffective. Once the circuit breaker recloses, the pantograph on the train roof will draw current again. At this time, because the faulty surge arrester has completely lost its insulation performance, a short-circuit path will re-form inside, causing the train to lose power and become stranded, leading to train delays. In more serious cases, it can result in serious consequences such as burning of the grid and evacuation of passengers. Summary of the Invention

[0004] In order to mitigate the risks that may arise from externally mounted or internally mounted surge arresters, this application provides a DC surge arrester for vehicles with an internally mounted disconnect device.

[0005] This application provides a DC surge arrester for vehicles with a built-in disconnection device, which adopts the following technical solution: A DC surge arrester for vehicles with a built-in disconnection device includes an outer sleeve and a core. The outer sleeve is fitted onto the core. An electrode is provided inside the insulating tube, which divides the interior of the insulating tube into an upper chamber and a lower chamber. A functional module is provided in the upper chamber for overvoltage protection. A disconnection device is provided in the lower chamber and is located at the upper part of the lower chamber. A connection hole is provided on the core to connect to the lower chamber, and a grounding terminal is provided in the connection hole. The grounding terminal is connected to the disconnection device.

[0006] By adopting the above technical solution, electrodes are placed inside the insulating tube, allowing the internal space of the insulating tube to be divided into an upper chamber and a lower chamber. The upper chamber contains functional modules, enabling overvoltage protection under normal operating conditions. When the surge arrester fails and a short-circuit fault occurs, the arc generated by the short-circuit current causes the gas in the upper chamber to expand rapidly under thermal effects, thereby pushing the breaker to quickly break through the outer casing, releasing the pressure inside the upper chamber and preventing a pulverizing explosion of the surge arrester. Because the disconnection device is located in the lower chamber and physically isolated by electrodes, the complete loss of insulation performance in the upper chamber will not affect the performance of the lower chamber, ensuring that the disconnection device reliably operates to disconnect the circuit during this process. Furthermore, after the disconnection device operates, the insulation performance of the insulating components in the lower chamber is preserved. In addition, since the disconnection device is located in the lower chamber, even if it operates, the metal fragments and debris generated are confined to the inside of the surge arrester and will not damage other electrical equipment near the surge arrester. This fundamentally avoids the adverse effects on rail vehicles caused by metal fragments, debris, and the ejection of the disconnector lead wire after the operation of an external disconnection device.

[0007] Optionally, the core further includes a lower flange, the insulating tube is disposed inside the outer jacket, the lower flange is disposed on the insulating tube, and the lower flange and the insulating tube form a lower chamber.

[0008] By adopting the above technical solution, the assembly personnel fix the release device to the electrode using a threaded or other fixing structure. Then, the lower flange is fixed to the insulating tube using a threaded or other fixing structure, so that the lower flange, the insulating tube, and the electrode form a lower chamber. The release device is located above the lower chamber, so that the assembly personnel can install the release device.

[0009] Optionally, the insulating tube has a T-shaped hole that connects to the upper chamber, and a piercing device is provided at the T-shaped hole. The outer sleeve is made of silicone rubber, and the surface of the piercing device is tapered.

[0010] By adopting the above technical solution, when a short-circuit fault occurs in the surge arrester, the air in the upper chamber of the insulating tube expands rapidly due to the thermal effect of the short-circuit current, forcing the breaker to quickly break through the silicone rubber outer jacket, thereby releasing the rapidly increasing pressure inside the upper chamber and ensuring that the surge arrester does not explode pulverized. At the same time, because the surface of the breaker is conical, it can quickly tear the outer jacket. Since the breaker is located at the T-shaped hole, the wall of the T-shaped hole can support the breaker, allowing it to move stably towards the outer jacket. Furthermore, the T-shaped hole does not restrict the movement of the breaker, ensuring that it can successfully break through the outer jacket.

[0011] Optionally, the disconnection device further includes a disconnection component for disconnecting the circuit by a disconnection action. The grounding terminal is provided with a fixing block and a sealing ring. The fixing block is located on the side of the sealing ring close to the disconnection device, and the sealing ring is polygonal. When the fixing block abuts against the insulating tube, the ball head of the grounding terminal abuts against the outer wall of the disconnection component in the disconnection device.

[0012] By adopting the above technical solution, when the fixing block abuts against the insulating tube, the assembly personnel cannot continue to install the grounding terminal, and at this time the assembly personnel know that the grounding terminal is installed in place; since the sealing ring is polygonal, the sealing ring can restrict the rotation of the grounding terminal, reducing the possibility of relative rotation between the grounding terminal and the insulating tube; the grounding terminal and the insulating tube are fixed by a threaded connection or other fixed structure to eliminate the possibility of the grounding terminal becoming loose due to impact vibration during vehicle operation.

[0013] Optionally, the distance between the outer surface of the sealing ring and the grounding end is greater than the distance between the outer surface of the fixing block and the grounding end, and the outer sleeve is filled between the sealing ring and the insulating tube.

[0014] By adopting the above technical solution, when the silicone rubber jacket is applied, the silicone rubber completely fills the sealing ring between the fixing block and the insulating tube, as well as the periphery of the fixing block. This further improves the firmness between the grounding terminal and the jacket, and also increases the sealing performance of the grounding terminal, preventing external moisture from entering the lower chamber through the grounding terminal and affecting the insulation performance of the lower chamber.

[0015] Optionally, the electrode has a countersunk hole, and the detachment device includes a detachment seat with a connecting block threaded into the countersunk hole.

[0016] By adopting the above technical solution, the connecting block is threaded into the countersunk hole, which allows the release device and the electrode to be fixed to each other, reducing the possibility of the release device becoming loose due to the impact vibration generated during vehicle operation.

[0017] Optionally, the electrode is provided with a connecting ring, which is threaded onto the inner wall of the insulating tube.

[0018] By adopting the above technical solution, the connection between the electrode and the insulating tube can be made more secure by connecting the connecting ring to the inner wall of the insulating tube with a thread. The electrode can reliably divide the insulating tube cavity into two independent chambers, an upper chamber and a lower chamber, so that the air in the upper chamber and the air in the lower chamber will not flow to each other. At the same time, it can prevent the possibility of the electrode moving in the insulating tube due to air expansion in the upper chamber under short-circuit fault conditions, and also avoid the possibility of electric arc entering the lower chamber and damaging the insulation of the lower chamber.

[0019] Optionally, the detachment device further includes a detachment component. A fixing groove for placing the detachment component is provided on the surface of the detachment seat near the electrode. The outer diameter of the detachment component gradually increases along the direction from the opening of the fixing groove to the bottom wall of the fixing groove. A grounding hole communicating with the fixing groove is provided on the detachment seat.

[0020] By adopting the above technical solution, when the disconnecting device disengages, the disconnecting component can penetrate the bottom wall of the fixed slot, allowing it to detach from the slot. Because the outer diameter of the disconnecting component gradually increases from the opening of the fixed slot to the bottom wall, friction between the grounding end ball and the disconnecting component is reduced, facilitating rapid detachment from the fixed slot. Furthermore, the grounding end is connected to the disconnecting component of the disconnecting device through the grounding hole of the disconnecting seat. After the disconnecting component detaches, an effective electrical circuit cannot be formed between the grounding end and the electrode due to the lack of the necessary disconnecting component for conduction. At this point, there will be sufficient insulation distance between the grounding end and the electrode, allowing the fault arrester to obtain sufficient insulation performance. When the pantograph receives current again after the traction substation circuit breaker is reclosed, a short-circuit path will not be re-established inside the arrester.

[0021] Optionally, an annular groove is formed on the surface of the release seat away from the functional module, and the diameter of the annular groove is the same as the diameter of the bottom wall of the fixing groove.

[0022] By adopting the above technical solution, when the release component penetrates the bottom wall of the fixing groove, it is located on the surface of the release seat away from the electrode through an annular groove, which enables the release component to penetrate the bottom wall of the fixing groove more quickly, and the separation between the release component and the release seat can be achieved more quickly.

[0023] Optionally, the release member has a receiving groove, and a conductive sheet and a ceramic ring are provided in the receiving groove. The ceramic ring is sleeved on the conductive sheet, and the conductive sheet is used to abut the electrode. An isolation ring is sleeved on the ceramic ring and is located in the receiving groove.

[0024] By adopting the above technical solution, the discharge of the ceramic ring to the inner wall of the release component can be prevented, thus avoiding any impact on the reliable operation of the release device. In addition, apart from the release seat and the release component, the conductive plate and the ceramic ring are completely placed inside the release component, which can maximize the protection that the nail gun triggering action will only damage the inner wall of the release component and will not affect the insulation of the lower chamber.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By placing electrodes inside the insulating tube, the internal space of the insulating tube can be divided into an upper chamber and a lower chamber. The upper chamber contains a functional module, providing overvoltage protection under normal operating conditions. When the surge arrester fails and a short-circuit fault occurs, the arc generated by the short-circuit current causes the gas in the upper chamber to expand rapidly under thermal effects, thereby pushing the breaker to quickly break through the outer casing, releasing the pressure in the upper chamber and preventing the surge arrester from shattering and exploding. The detachment device is located in the lower chamber, and is physically isolated by electrodes. The complete loss of insulation performance in the upper chamber will not affect the performance of the lower chamber, and the disconnection device can still reliably operate to disconnect the circuit during this process. At the same time, after the disconnection device operates, the insulation performance of the insulating components in the lower chamber can still be preserved. In addition, since the disconnection device is located in the lower chamber, even if it operates and disconnects, the metal fragments and debris generated are limited to the inside of the surge arrester and will not cause damage to other electrical equipment near the surge arrester. This avoids the adverse effects on the rail vehicle caused by metal fragments, debris, and disconnector lead wires thrown out after the operation of the external disconnection device.

[0026] 2. When the disconnecting device disengages, the disconnecting component can penetrate the bottom wall of the fixing slot, allowing it to detach from the slot. Because the outer diameter of the disconnecting component gradually increases from the opening of the fixing slot to the bottom wall, friction between the grounding end ball and the disconnecting component is reduced, facilitating rapid detachment. Furthermore, the grounding end is connected to the disconnecting component of the disconnecting device through the grounding hole of the disconnecting seat. After the disconnecting component detaches, an effective electrical circuit cannot be formed between the grounding end and the electrode due to the lack of the necessary disconnecting component for conduction. At this point, there will be sufficient insulation distance between the grounding end and the electrode, allowing the fault arrester to obtain adequate insulation performance. When the pantograph receives current again after the traction substation circuit breaker is reclosed, a short-circuit path will not be re-established inside the arrester. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is an exploded view of the core in an embodiment of this application; Figure 3 It is along Figure 1Sectional view of line AA in the middle; Figure 4 yes Figure 3 Enlarged diagram of part B.

[0028] Reference numerals: 1. Core; 11. Top cover; 111. Upper ring; 112. First sealing groove; 12. Outer sleeve; 13. Lower flange; 131. Fixing ring; 132. Second sealing groove; 2. Insulating tube; 21. Upper chamber; 22. Lower chamber; 23. T-hole; 231. Hole breaker; 24. Connecting hole; 3. Functional module; 31. Electrode; 311. Connecting ring; 312. Mounting groove; 313. Countersunk hole; 32. AC / DC resistor element; 33. Aluminum 34. Pad; 341. Spring positioning block; 35. Boss; 4. Compression spring; 4. Release device; 41. Release seat; 411. Fixing groove; 412. Ring groove; 413. Connecting block; 414. Grounding hole; 42. Release component; 421. Receiving groove; 422. Receiving groove; 43. Isolation ring; 44. Ceramic ring; 45. Conductive sheet; 46. Gap cover; 47. Nail gun cartridge; 48. Small spring; 5. Grounding end; 51. Fixing block; 52. Sealing ring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0030] This embodiment discloses a DC surge arrester for vehicles with a built-in disconnection device. (Refer to...) Figure 1 and Figure 2 A DC surge arrester for vehicles with a built-in disconnection device includes an outer casing 12 and a core 1. The core 1 includes an upper cover 11, an insulating tube 2, and a lower flange 13.

[0031] Reference Figure 3 A retaining ring 131 is integrally formed on the lower flange 13, and the insulating tube 2 is threadedly connected to the inner wall of the retaining ring 131 to achieve relative fixation between the lower flange 13 and the insulating tube 2. An upper ring 111 is integrally formed on the upper cover 11, and the insulating tube 2 is threadedly connected to the inner wall of the upper ring 111 to achieve relative fixation between the upper ring 111 and the insulating tube 2.

[0032] Reference Figure 3 The outer surface of the fixing ring 131 has multiple second sealing grooves 132, which are arranged in an array along the height direction of the fixing ring 131. The outer surface of the upper ring 111 has multiple first sealing grooves 112, which are arranged in an array along the height direction of the upper ring 111. The outer sleeve 12 is made of silicone rubber and is integrally formed on the insulating tube 2, the upper cover 11, and the lower flange 13. The outer sleeve 12 can be located within the second sealing grooves 132 and the first sealing grooves 112.

[0033] Reference Figure 3 The insulating tube 2 contains a functional module 3, which is used to implement overvoltage protection. The insulating tube 2 contains an electrode 31. The functional module 3 includes two AC / DC resistors 32, an aluminum pad 33, and a spring positioning block 34. The aluminum pad 33 is disposed between the two AC / DC resistors 32. The spring positioning block 34 and the electrode 31 are respectively disposed on the end faces of different AC / DC resistors 32. Both AC / DC resistors 32 are located between the spring positioning block 34 and the electrode 31.

[0034] Reference Figure 3 The functional module 3 is provided with a compression spring 35, which is located between the limiting block integrally formed by the upper cover 11 and the boss 341 integrally formed by the spring positioning block 34.

[0035] Reference Figure 4 A connecting ring 311 is integrally formed on the electrode 31, and the connecting ring 311 is threaded to the inner wall of the insulating tube 2. Two mounting grooves 312 are formed on the electrode 31, and the inner wall of the mounting grooves 312 is threaded. The assembler inserts a tool into the mounting groove 312 to install the electrode 31 on the inner wall of the insulating tube 2.

[0036] Reference Figure 3 and Figure 4 When electrode 31 is installed on insulating tube 2, electrode 31 divides the interior of insulating tube 2 into upper chamber 21 and lower chamber 22. Upper chamber 21 is the space between electrode 31 and upper cover 11, and lower chamber 22 is the space between electrode 31 and lower flange 13. Lower chamber 22 is equipped with disconnection device 4, which disconnects the circuit after a short circuit fault occurs in the surge arrester within lower chamber 22.

[0037] Reference Figure 3 Multiple T-shaped holes 23 are formed on the outer surface of the insulating tube 2, and the T-shaped holes 23 connect to the upper chamber 21. A puncturer 231 is installed inside the T-shaped hole 23, and the end face of the puncturer 231 near the outer sleeve 12 is conical. When a short circuit fault occurs in the surge arrester, the air in the upper chamber 21 expands rapidly due to the thermal effect of the short circuit current, forcing the puncturer 231 to quickly break through the outer sleeve 12, thereby releasing the rapidly increasing pressure inside the upper chamber 21.

[0038] Reference Figure 4 The detachment device 4 includes a detachment seat 41 and a detachment member 42. A fixing groove 411 is formed on the detachment seat 41, extending along the height direction of the detachment seat 41. The detachment member 42 is disposed within the fixing groove 411. An annular groove 412 is formed on the side of the detachment seat 41 away from the opening of the fixing groove 411. The annular groove 412 is a V-shaped groove that extends circumferentially along the detachment seat 41, and its diameter is the same as the diameter of the bottom wall of the fixing groove 411.

[0039] Reference Figure 4 A connecting block 413 is integrally formed on the surface of the release seat 41, and the connecting block 413 is arranged in a ring shape. A countersunk hole 313 is formed on the surface of the electrode 31 for the connecting block 413 to be inserted. The groove wall of the countersunk hole 313 is threadedly connected to the connecting block 413 to achieve relative fixation of the release seat 41 and the electrode 31.

[0040] Reference Figure 4 A receiving groove 421 is formed on the end face of the release member 42, and the receiving groove 421 extends along the height direction of the release member 42. A receiving groove 422 is formed on the bottom wall of the receiving groove 421, and the receiving groove 422 extends along the height direction of the release member 42. An isolation ring 43 and a ceramic ring 44 are provided in the receiving groove 421, and the ceramic ring 44 is disposed inside the isolation ring 43.

[0041] Reference Figure 4 A conductive sheet 45 is provided in the receiving groove 421, and the electrode 31 is abutted above the conductive sheet 45. A gap cover 46 is provided at each of the upper and lower ends of the ceramic ring 44, and the conductive sheet 45 abuts against one gap cover 46. A nail gun cartridge 47 is provided in the receiving groove 422, and a small spring 48 is provided on the bottom wall of the receiving groove 422, and the small spring 48 abuts against the nail gun cartridge 47.

[0042] Reference Figure 3 and Figure 4 When a short circuit occurs in the upper chamber 21, the short circuit current will cause the ceramic ring 44 to heat up rapidly, and then the heat will be conducted to the nail gun 47 to trigger its rapid action. Under the impact of the kinetic energy of the nail gun 47 and the weight of the release member 42, the release member 42 and the components inside it will break through the release seat 41 together with the release member 42 and fall rapidly to the lower part of the lower chamber 22, thereby disconnecting the electrical circuit.

[0043] Reference Figure 4 The insulating tube 2 is provided with a grounding terminal 5, and a connecting hole 24 is opened on the insulating tube 2 to connect to the lower chamber 22. The grounding terminal 5 is threaded into the connecting hole 24. A fixing block 51 and a sealing ring 52 are integrally formed on the grounding terminal 5. The fixing block 51 is cylindrical, and the sealing ring 52 is hexagonal prism. The fixing block 51 is located on the side of the sealing ring 52 closer to the insulating tube 2. The distance from the outer surface of the sealing ring 52 to the grounding terminal 5 is greater than the distance from the outer surface of the fixing block 51 to the grounding terminal 5.

[0044] Reference Figure 4 When the grounding terminal 5 is fixed to the insulating tube 2, the outer sleeve 12 can fill the periphery of the sealing ring 52 and the insulating tube 2 to enhance the relative fixation and sealing performance of the grounding terminal 5 and the insulating tube 2.

[0045] Reference Figure 4One end of the grounding terminal 5 has a ball head, and a grounding hole 414 communicating with the fixing groove 411 is opened on the outer surface of the release seat 41. The grounding hole 414 allows the ball head of the grounding terminal 5 to be inserted, and the ball head can abut against the outer surface of the release member 42. The outer diameter of the release member 42 gradually increases from the opening of the fixing groove 411 to the bottom wall of the fixing groove 411, so as to reduce the friction between the grounding terminal 5 and the release member 42 when the release member 42 is released from the fixing groove 411.

[0046] The implementation principle of a vehicle DC surge arrester with a built-in disconnection device in this application embodiment is as follows: When a short circuit fault occurs in the surge arrester, the short circuit current will cause the ceramic ring 44 to heat up rapidly, and then the heat will be conducted to the nail gun cartridge 47 to trigger its rapid action. Under the impact of the kinetic energy of the nail gun cartridge 47 and the weight of the disconnection component 42, the disconnection component 42 and the components inside it will break through the disconnection seat 41 together with the disconnection component 42 and fall rapidly to the lower part of the lower chamber 22. Since the disconnection component 42 required for conduction between the electrode 31 and the grounding terminal 5 is missing, the electrical circuit is disconnected.

[0047] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. A DC surge arrester for vehicles with a built-in disconnection device, characterized in that: The device includes an outer casing (12) and a core (1). The outer casing (12) is fitted onto the core (1). The core (1) includes an insulating tube (2). An electrode (31) is provided inside the insulating tube (2). The electrode (31) divides the interior of the insulating tube (2) into an upper chamber (21) and a lower chamber (22). A functional module (3) is provided inside the upper chamber (21). The functional module (3) is used to implement overvoltage protection. A disconnection device (4) is provided inside the lower chamber (22). The disconnection device (4) is located at the upper part of the lower chamber (22). A connection hole (24) is provided on the core (1) to connect to the lower chamber (22). A grounding terminal (5) is provided inside the connection hole (24). The grounding terminal (5) is connected to the disconnection device (4).

2. A vehicle DC surge arrester with a built-in disconnection device according to claim 1, characterized in that: The core (1) also includes a lower flange (13), the insulating tube (2) is disposed inside the outer sleeve (12), the lower flange (13) is disposed on the insulating tube (2), and the lower flange (13) and the insulating tube (2) form a lower chamber (22).

3. A vehicle DC surge arrester with a built-in disconnection device according to claim 2, characterized in that: The insulating tube (2) has a T-shaped hole (23) that connects to the upper chamber (21). A hole breaker (231) is provided at the T-shaped hole (23). The outer sleeve (12) is made of silicone rubber. The surface of the hole breaker (231) is conical.

4. A vehicle DC surge arrester with a built-in disconnection device according to claim 2, characterized in that: The disconnection device (4) further includes a disconnection component (42), which is used to disconnect the circuit by disconnection action. The grounding end (5) is provided with a fixing block (51) and a sealing ring (52). The fixing block (51) is located on the side of the sealing ring (52) close to the disconnection device (4). The sealing ring (52) is polygonal. When the fixing block (51) abuts against the insulating tube (2), the ball head of the grounding end (5) abuts against the outer wall of the disconnection component (42) in the disconnection device (4).

5. A vehicle DC surge arrester with a built-in disconnection device according to claim 4, characterized in that: The distance between the outer surface of the sealing ring (52) and the grounding end (5) is greater than the distance between the outer surface of the fixing block (51) and the grounding end (5), and the outer sleeve (12) is filled between the sealing ring (52) and the insulating tube (2).

6. A vehicle DC surge arrester with a built-in disconnection device according to claim 1, characterized in that: The electrode (31) has a countersunk hole (313), and the detachment device (4) includes a detachment seat (41). The detachment seat (41) is provided with a connecting block (413), and the connecting block (413) is threaded into the countersunk hole (313).

7. A vehicle DC surge arrester with a built-in disconnection device according to claim 6, characterized in that: The electrode (31) is provided with a connecting ring (311), which is threaded to the inner wall of the insulating tube (2).

8. A vehicle DC surge arrester with a built-in disconnection device according to claim 6, characterized in that: The detachment device (4) further includes a detachment member (42). The detachment seat (41) has a fixing groove (411) for placing the detachment member (42) on its surface near the electrode (31). The outer diameter of the detachment member (42) gradually increases along the direction from the opening of the fixing groove (411) to the bottom wall of the fixing groove (411). The detachment seat (41) has a grounding hole (414) that connects to the fixing groove (411).

9. A vehicle DC surge arrester with a built-in disconnection device according to claim 8, characterized in that: The surface of the release seat (41) away from the functional module (3) has an annular groove (412), the diameter of which is the same as the diameter of the bottom wall of the fixing groove (411).

10. A vehicle DC surge arrester with a built-in disconnection device according to claim 8, characterized in that: The release member (42) has a receiving groove (421), and a conductive sheet (45) and a ceramic ring (44) are provided in the receiving groove (421). The ceramic ring (44) is sleeved on the conductive sheet (45), and the conductive sheet (45) is used to abut the electrode (31). An isolation ring (43) is sleeved on the ceramic ring (44), and the isolation ring (43) is located in the receiving groove (421).

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