Arrester

Abstract

The present application provides an arrester. The arrester comprises: a housing, the housing comprising a first mounting portion and a second mounting portion, the first mounting portion being provided with a first mounting cavity, the second mounting portion being provided with a second mounting cavity, and the first mounting cavity being communicated with the second mounting cavity; an arrester core, mounted in the second mounting cavity; a sealing assembly, the sealing assembly being mounted in the first mounting cavity and comprising a first elastic member and a sealing cover, one end of the first elastic member abutting against the top of the first mounting portion, the other end of the first elastic member abutting against the sealing cover, and a pressure relief hole communicated with the second mounting cavity being provided on the sealing cover; and an anti-explosion structure, the strength of the anti-explosion structure being smaller than that of the housing, the anti-explosion structure being located between the sealing cover and the arrester core, and the anti-explosion structure being configured to be capable of plugging the pressure relief hole. The arrester of the technical solution of the present application solves the problem in the prior art of unstable explosion values at weak points of arresters having pressure relief devices.

Description

lightning arrester

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 12, 2024, with application number 202410048570.1 and application name “Lightning Arrester”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of lightning arresters, and in particular to a lightning arrester. Background Art

[0003] Zinc oxide surge arresters are currently recognized worldwide as the most superior overvoltage protectors. They are used to protect transmission lines and electrical equipment from high transient overvoltages and limit the amplitude and duration of follow-current current. The arrester's overvoltage protection characteristics are reflected in its core component, the resistor. As the State Grid continues to increase its requirements for grid safety and reliability, 10kV surge arresters are now widely used for overvoltage protection in 10kV power systems. 10kV surge arresters are primarily available in composite and porcelain jackets. In southern China, particularly at high altitudes, porcelain jackets are generally preferred due to factors such as high altitude and strong ultraviolet rays. When providing overvoltage protection in power systems, 10kV porcelain-cased surge arresters can explode if subjected to energy exceeding their tolerance limits. If the arrester's seal is damp, prolonged operation under power frequency voltage will cause continuous heat generation, accelerating aging. When the arrester's heating rate exceeds its heat dissipation rate, it will eventually experience thermal collapse, leading to product explosion. 10kV porcelain case lightning arresters are usually used in conjunction with power transmission systems, and are surrounded by a variety of electrical equipment, such as transformers, fuses, transmission lines, distribution boxes, etc. If a lightning arrester explodes, it will cause immeasurable damage to surrounding equipment. In addition, 10kV transmission lines are generally built in residential areas. If a lightning arrester explodes, it will also cause harm to people and vehicles under the line.

[0004] In the prior art, the upper end of the arrester is sealed with an end sealing ring, the copper end cover is rolled and riveted, and the lower end is sealed with a V-shaped sealing ring, which is compressed by a spring and tightened by a T-bolt to achieve sealing of the arrester. At the same time, a pressure relief device is provided at the end of the arrester, that is, a weak point is provided on the copper end cover. When the pressure inside the arrester exceeds a certain pressure value, the weak point explodes, which can reduce the internal pressure of the porcelain sleeve and avoid a pulverizing explosion of the porcelain sleeve. However, the weak point is provided on the copper end cover, that is, a groove is made on the end face of the copper end cover, and the blasting value of the weak point is unstable. If the groove depth is too large, the mechanical strength of the copper end cover will be reduced, and the compression spring provided inside the arrester may explode the weak point. If the groove depth is too small, the purpose of setting the weak point for pressure relief cannot be achieved. Secondly, the material and processing technology of copper will directly affect the blasting value of the weak point. The raw materials and processing technology purchased by different manufacturers are different. Moreover, during the rolling riveting process, the copper end cover will generate tearing force on the weak point, reducing the mechanical strength of the copper end cover. The damage to the weak point caused by the rolling riveting process is immeasurable. Summary of the Invention

[0005] The main purpose of the present application is to provide a lightning arrester that can solve the problem of unstable explosion value of weak points of lightning arresters with pressure relief devices in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a lightning arrester is provided, including: a shell, the shell including a first mounting part and a second mounting part, the first mounting part having a first mounting cavity, the second mounting part having a second mounting cavity, and the first mounting cavity being connected to the second mounting cavity; a lightning arrester core, installed in the second mounting cavity; a sealing assembly, the sealing assembly being installed in the first mounting cavity, the sealing assembly including a first elastic member and a sealing cover, the first elastic member being used to press the sealing cover tightly at the open end of the second mounting part, one end of the first elastic member abutting the top of the first mounting part, and the other end of the first elastic member abutting the sealing cover, and the sealing cover being provided with a pressure relief hole connected to the second mounting cavity; and an explosion-proof structure, the strength of the explosion-proof structure being less than the strength of the shell, the explosion-proof structure being located between the sealing cover and the lightning arrester core, and the explosion-proof structure being constructed to be able to block the pressure relief hole.

[0007] Based on the above technical content, by setting the explosion-proof structure, the shell and the sealing cover independently of each other, the compressive strength of the explosion-proof structure is not affected by the structural errors, material selection and processing technology of the shell and the sealing cover. The compressive strength of the explosion-proof structure is determinable and constant, that is, the explosion value of the explosion-proof structure (the maximum pressure value at which the explosion-proof structure is damaged) is determinable and stable.

[0008] In one possible implementation, a second elastic member is provided at one end of the arrester core close to the first mounting portion, one end of the second elastic member is sleeved on the arrester core, and the other end of the second elastic member is elastically abutted against the explosion-proof structure. The central axis of the second elastic member, the central axis of the pressure relief hole, and the central axis of the explosion-proof structure are collinear, and the outer diameter of the end of the second elastic member close to the sealing cover is larger than the diameter of the pressure relief hole.

[0009] Furthermore, by sleevedly placing one end of the second elastic member on the arrester core, and elastically contacting the explosion-proof structure with the other end of the second elastic member, on the one hand, under the elastic force of the second elastic member, the explosion-proof structure is pressed against the sealing cover, so that the explosion-proof structure blocks the pressure relief hole. On the other hand, the arrester core can be limited to prevent the arrester core from rocking left and right within the first mounting cavity. The outer diameter of the end of the second elastic member near the sealing cover is greater than the diameter of the pressure relief hole 41, so that the sealing cover bears part of the elastic force of the second elastic member, which can prevent the elastic force of the second elastic member from acting entirely on the explosion-proof structure, causing damage to the explosion-proof structure.

[0010] In a possible implementation, the pressure exerted by the first elastic member on the sealing cover is greater than the pressure exerted by the second elastic member on the sealing cover.

[0011] Furthermore, by setting the pressure of the first elastic part on the sealing cover to be greater than the pressure of the second elastic part on the sealing cover, the sealing cover can be pressed against the open end of the second mounting part, and the bottom surface of the sealing cover is tightly fitted with the end surface of the second mounting part, thereby ensuring the sealing effect of the second mounting cavity.

[0012] In a possible implementation, the first mounting portion and the second mounting portion are an integrated structure, and an end of the first mounting portion away from the arrester core is provided with a mounting hole communicating with the first mounting cavity.

[0013] Further,

[0014] In a possible implementation, the sealing cover is slidably disposed in the first mounting portion and is capable of sliding along the length extension direction of the arrester core.

[0015] Furthermore, by arranging the first mounting portion and the second mounting portion as an integrated structure, there is no need to arrange an additional connecting structure to achieve the connection between the two, so that the overall structure of the lightning arrester is relatively simple.

[0016] In a possible implementation, the first installation cavity passes through the first installation portion in a direction perpendicular to the central axis of the arrester.

[0017] Furthermore, by being arranged in a direction perpendicular to the central axis of the arrester, the first installation cavity penetrates the first installation portion, so that the gas in the second installation cavity can be discharged, thereby achieving pressure relief.

[0018] In a possible implementation, a limiting groove is provided on a side of the sealing cover facing away from the arrester core, and an end of the first elastic member close to the arrester core is clamped in the limiting groove.

[0019] Furthermore, the setting of the limiting groove can not only achieve installation positioning and improve installation efficiency, but also limit the first elastic member in the horizontal direction to prevent the first elastic member from moving in the horizontal direction, thereby improving the structural stability of the lightning arrester.

[0020] In one possible implementation, the sealing assembly also includes a sealing ring, which is arranged at the end of the second mounting portion. The sealing ring is located on the side of the explosion-proof structure away from the first elastic member. When the first elastic member presses the sealing cover against the open end of the second mounting portion, the sealing cover can press the sealing ring against the open end of the second mounting portion.

[0021] Furthermore, the provision of the sealing ring can further prevent the first installation cavity or external air from entering the second installation cavity, thereby improving the sealing effect.

[0022] In one possible implementation, a mounting groove is provided on the side of the sealing cover facing the arrester core, the depth of the mounting groove is greater than the thickness of the explosion-proof structure, and the depth of the mounting groove is less than the sum of the thickness of the explosion-proof structure and the sealing ring, and one end of the arrester core close to the first mounting portion is constructed to be able to press and fix the explosion-proof structure in the mounting groove.

[0023] Furthermore, by providing the mounting groove, the sealing ring 60 can be accurately compressed, so that the sealing performance of the arrester meets the requirements and the qualified rate of the arrester products reaches 100%.

[0024] In one possible implementation, the arrester further includes a high-voltage terminal wiring assembly, which is mounted at an end of the first mounting portion away from the arrester core, and the first elastic member elastically abuts between the high-voltage terminal wiring assembly and the sealing cover.

[0025] Furthermore, the high-voltage terminal wiring assembly is used to connect with other electrical devices on the one hand, and on the other hand, the high-voltage terminal wiring assembly cooperates with the sealing cover to compress the first elastic member, and the elastic restoring force of the first elastic member presses the sealing cover tightly against the open end of the second mounting portion.

[0026] In one possible implementation, the high-voltage terminal wiring assembly includes a wiring member, a limit member and a first locking member. One end of the wiring member is located in the first mounting cavity and fits against the inner wall of the first mounting portion. The other end of the wiring member passes through the mounting hole. The limit member is sleeved on the wiring member. The end of the limit member away from the first elastic member fits against the outer wall of the first mounting portion. The first locking member is used to lock the limit member on the wiring member.

[0027] Furthermore, by providing a high-voltage terminal wiring assembly, the high-voltage terminal wiring assembly can be fixedly mounted on the first mounting portion.

[0028] In a possible implementation, the explosion-proof structure is an explosion-proof disk, and the thickness of the explosion-proof disk ranges from 0.7 mm to 0.9 mm.

[0029] Furthermore, the thickness of the explosion-proof disk is in the range of 0.7 mm to 0.9 mm, which can ensure the structural strength of the explosion-proof disk.

[0030] In a possible implementation, the compression amount of the sealing ring is 30% to 35%.

[0031] Furthermore, the compression amount of the sealing ring is 30% to 35%, so that the sealing ring can be prevented from losing its elasticity due to overpressure while ensuring the sealing effect.

[0032] The lightning arrester provided by the present application uses the technical solution of the present application. The first mounting cavity serves as a pressure relief space. The first elastic member presses the sealing cover against the open end of the second mounting portion. The bottom surface of the sealing cover is tightly fitted with the end surface of the open end of the second mounting portion. The explosion-proof structure blocks the pressure relief hole on the sealing cover to achieve sealing of the second mounting cavity. When the pressure in the second mounting cavity is greater than the maximum limit pressure that the explosion-proof structure can withstand, the explosion-proof structure is damaged and a rupture is generated. The gas in the second mounting cavity is discharged into the first mounting cavity through the pressure relief hole to achieve pressure relief, thereby preventing the shell from exploding. Compared with the prior art method of making grooves on the copper end cap as a weak point, the explosion-proof structure of the present application is independently arranged from the shell and the sealing cover. The compressive strength of the explosion-proof structure is not affected by the structural error, material selection, and processing technology of the shell and the sealing cover. The compressive strength of the explosion-proof structure is determinable and constant, that is, the explosion value of the explosion-proof structure (the maximum pressure value at which the explosion-proof structure is damaged) is determinable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0034] FIG1 shows a partial structural cross-sectional view of a lightning arrester according to an embodiment of the present application;

[0035] FIG2 shows a partial structural cross-sectional view of a lightning arrester according to an embodiment of the present application;

[0036] FIG3 shows a partial structural cross-sectional view of a lightning arrester according to an embodiment of the present application;

[0037] FIG4 shows a partial structural cross-sectional view of a lightning arrester according to an embodiment of the present application;

[0038] FIG5 is a schematic structural diagram of a housing of a lightning arrester according to an embodiment of the present application;

[0039] FIG6 shows a cross-sectional view of the housing of the arrester according to an embodiment of the present application;

[0040] FIG7 shows a partial structural cross-sectional view of a lightning arrester according to an embodiment of the present application;

[0041] FIG8 shows a cross-sectional view of a sealing cover of a lightning arrester according to an embodiment of the present application;

[0042] FIG9 shows a top view of the sealing cover of the arrester according to an embodiment of the present application;

[0043] FIG10 shows a partial structural cross-sectional view of a lightning arrester according to an embodiment of the present application;

[0044] FIG11 shows a partial structural cross-sectional view of the arrester core according to an embodiment of the present application;

[0045] FIG12 shows a schematic structural diagram of an explosion-proof structure according to an embodiment of the present application;

[0046] FIG13 shows a schematic structural diagram of the explosion-proof structure of an embodiment of the present application from another angle;

[0047] FIG14 shows a schematic structural diagram of a sealing ring according to an embodiment of the present application;

[0048] FIG15 shows a cross-sectional view of a sealing ring according to an embodiment of the present application;

[0049] FIG16 shows a cross-sectional view of a V-shaped sealing ring according to an embodiment of the present application;

[0050] FIG17 shows a schematic structural diagram of a connecting member according to an embodiment of the present application; and

[0051] FIG18 shows a schematic structural diagram of the second elastic member of an embodiment of the present application.

[0052] Among them, the above-mentioned drawings include the following figure marks: 10. Shell; 11. First mounting part; 12. Second mounting part; 13. First mounting cavity; 14. Second mounting cavity; 15. Mounting hole; 16. Through hole; 20. Arrester core; 21. Resistor; 22. Gasket; 23. T-bolt; 24. Heat shrink tube; 25. Gasket; 26. Positioning electrode; 30. First elastic part; 40. Sealing cover; 41. Pressure relief hole; 42. Mounting groove; 43. Limiting groove; 50. Explosion-proof structure; 60. Sealing ring; 70. Second elastic part; 80. High-voltage terminal wiring assembly; 81. Wiring member; 82. Limiting member; 83. Locking member; 90. V-shaped sealing ring. DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] According to the "GB / T11032 AC Gapless Metal Oxide Arrester" standard, newly designed arrester products need to undergo short-circuit testing to verify that the arrester jacket will not explode unacceptably (mainly in the form of a pulverizing explosion) when the arrester fails. In order to ensure the safety and reliability of 10kV transmission line operation, 10kV porcelain shell arresters are widely used in 10kV power systems to achieve overvoltage protection and prevent flashover of transmission line insulator strings, which can cause line tripping. Relevant data show that the failure of 10kV porcelain shell arresters has a certain proportion in the total number of distribution network failures, becoming one of the important factors affecting the reliability of distribution network operation. The main phenomenon of 10kV porcelain shell lightning arrester failure is explosion. The main reasons for the explosion are as follows: (1) Product quality problems. The core component resistor is used for assembly. When the lightning arrester performs overvoltage protection, it cannot withstand the energy generated under normal circumstances, resulting in explosion; (2) There is no problem with product quality, but the energy that the lightning arrester can withstand during protection has a certain limit. When the lightning arrester withstands energy exceeding its own limit, the lightning arrester will explode. In nature, the energy generated by lightning strikes on power transmission lines is mostly below the limit value, but there is also a certain probability of generating overvoltage with greater energy; (3) The lightning arrester seal fails and the interior is damp. Water enters the lightning arrester and the leakage current increases. The lightning arrester continues to heat up. The core component inside the lightning arrester, the resistor, is damaged or accelerates aging, causing a short circuit at the high and low voltage ends of the lightning arrester. The components or materials inside the porcelain sleeve are burned and vaporized, generating a large amount of heat, and the pressure inside the lightning arrester porcelain sleeve increases rapidly.

[0055] With reference to Figures 1 to 18, the present application provides a lightning arrester, which includes: a housing 10, the housing 10 includes a first mounting portion 11 and a second mounting portion 12, the first mounting portion 11 has a first mounting cavity 13, the second mounting portion 12 has a second mounting cavity 14, and the first mounting cavity 13 is connected to the second mounting cavity 14; a lightning arrester core 20, which is installed in the second mounting cavity 14; a sealing assembly, which is installed in the first mounting cavity 13, and the sealing assembly includes a first elastic member 30 and a sealing cover 40 The first elastic member 30 is used to press the sealing cover 40 against the open end of the second mounting portion 12, one end of the first elastic member 30 abuts against the top of the first mounting portion 11, and the other end of the first elastic member abuts against the sealing cover 40. The sealing cover 40 is provided with a pressure relief hole 41 connected to the second mounting cavity 14; and an explosion-proof structure 50. The strength of the explosion-proof structure 50 is less than that of the shell 10. The explosion-proof structure 50 is located between the sealing cover 40 and the arrester core 20. The explosion-proof structure 50 is constructed to be able to block the pressure relief hole 41.

[0056] In this embodiment, the first mounting cavity 13 can be used as a pressure relief space, the arrester core 20 is installed in the second mounting cavity 14, the first elastic member 30 presses the sealing cover 40 against the open end of the second mounting portion 12, the bottom surface of the sealing cover 40 is tightly fitted with the end surface of the open end of the second mounting portion 12, and the explosion-proof structure 50 blocks the pressure relief hole 41 on the sealing cover 40 to achieve sealing of the second mounting cavity 14. The strength of the explosion-proof structure 50 is less than the strength of the shell 10. The strength here refers to the compressive strength. The explosion-proof structure 50 is the weak point of the arrester. When the pressure in the second mounting cavity 14 is greater than the maximum limit pressure that the explosion-proof structure 50 can withstand, the explosion-proof structure 50 is damaged and a rupture is generated. The gas in the second mounting cavity 14 is discharged into the first mounting cavity 13 through the pressure relief hole 41 to achieve pressure relief, thereby preventing the shell 10 from exploding. Compared with the prior art method of making grooves on the copper end cover as weak points, the explosion-proof structure 50 of the present application is independently arranged from the shell 10 and the sealing cover 40. The compressive strength of the explosion-proof structure 50 is not affected by the structural errors, material selection, and processing technology of the shell 10 and the sealing cover 40. The compressive strength of the explosion-proof structure 50 is determinable and constant, that is, the explosion value of the explosion-proof structure 50 (the maximum pressure value at which the explosion-proof structure 50 is damaged) is determinable and stable.

[0057] In addition, the arrester core 20 is installed into the second mounting cavity 14 from the open end of the second mounting portion 12, one end of the first elastic member 30 elastically abuts against the top of the first mounting portion 11, and the other end of the first elastic member 30 elastically abuts against the sealing cover 40. The first elastic member 30 is compressed to generate elastic force, which can press the sealing cover 40 against the open end of the second mounting portion 12. The explosion-proof structure 50 blocks the pressure relief hole 41, and finally achieves the sealing of the second mounting cavity 14. As can be seen from the above, the generation of the elastic force of the first elastic member 30 of the present application relies on the first mounting portion 11 and the sealing cover 40. There is no need to set up an additional structure to cooperate with the first elastic member 30 to generate an elastic force. The overall structure of the arrester is relatively simple and easy to produce.

[0058] In the prior art, the upper end of the 10kV porcelain shell arrester is sealed with an end sealing ring, the copper end cover is rolled and riveted, and the lower end is sealed with a V-shaped sealing ring, which is compressed by a spring and tightened by a T-bolt to achieve the sealing of the arrester. The porcelain sleeve of the 10kV porcelain shell arrester is made by firing in a kiln. There are certain errors in the shrinkage rate and coaxiality of the porcelain sleeve, and the structural dimensions of the porcelain sleeve are unstable. Due to the different coaxialities of the porcelain sleeve, the porcelain sleeve will shake left and right when it is rolled and riveted, causing the end face of the porcelain sleeve to knock and splash. The sealing method of the present application is to press the sealing cover 40 against the open end of the second mounting part 12 through the elastic force of the first elastic member 30, and the explosion-proof structure 50 blocks the pressure relief hole 41 to achieve the sealing of the second mounting cavity 14. Compared with the above-mentioned sealing method, the sealing method of the present application is more convenient and safer.

[0059] In addition, due to the different shrinkage rates of the porcelain sleeve, the structural height of the porcelain sleeve fluctuates within a certain range. When the copper end cap is roll-riveted on the porcelain sleeve, there will be overpressure or underpressure. When overpressure occurs, the end sealing ring will be deformed due to excessive pressure. When underpressure occurs, the end sealing ring will not be compressed enough due to insufficient pressure. Both overpressure and underpressure will lead to poor sealing. After the mesh is put into operation, an explosion will occur within a short period of time. Roll-riveting sealing cannot guarantee 100% sealing compliance. Table 1 shows the qualified rate data of the 10kV porcelain shell lightning arrester sealing test under different pressing forces:

[0060] Table 1

[0061] The sealing of the present application is achieved by the elastic force of the first elastic member 30 pressing the sealing cover 40 against the open end of the second mounting portion 12 and the explosion-proof structure 50 blocking the pressure relief hole 41. The compression amount of the first elastic member 30 can be adjusted by the height of the first mounting cavity 13 and the thickness of the sealing cover 40. That is, the elastic force of the first elastic member 30 can be accurately controlled, and problems such as overpressure and underpressure will not occur, which can make the lightning arrester have good sealing performance.

[0062] In one embodiment, the first elastic member 30 is a spring.

[0063] At present, the market includes 10kV porcelain shell lightning arresters without pressure relief devices and 10kV porcelain shell lightning arresters with pressure relief devices. In order to ensure that the 10kV porcelain shell lightning arrester has good sealing performance, it is also necessary to ensure that no pulverizing explosion occurs when the lightning arrester fails. For 10kV porcelain shell lightning arresters without pressure relief devices, the strength of the product is increased by increasing the thickness of the porcelain sleeve. However, the method of increasing the thickness of the porcelain sleeve to increase the strength is immeasurable for the increase in product cost. At the same time, when the lightning arrester fails, the energy generated varies. If the energy is small, the lightning arrester porcelain sleeve will not explode due to its high strength. However, if the energy is large, the pressure generated inside the porcelain sleeve is large, and the risk of explosion is also greater. The lightning arrester of the present application adopts the method of arranging an explosion-proof structure 50 inside the lightning arrester. When the pressure inside the lightning arrester is too high, the explosion-proof structure 50 explodes, and the gas inside the lightning arrester is discharged through the through hole 16 on the sealing cover 40, achieving pressure relief. Compared with the above-mentioned method of avoiding the explosion of the porcelain sleeve, the cost of the lightning arrester of the present application is lower.

[0064] It should be noted that the strength of the explosion-proof structure 50 is much smaller than the strength of the shell 10. If the strengths of the two are close, when the pressure value in the installation cavity is too large, even if the explosion-proof structure 50 explodes first, the gas in the second installation cavity 14 will not have enough time to be discharged. The pressure value in the second installation cavity 14 will continue to increase, and the shell 10 will still explode.

[0065] 1 to 18 , in one embodiment of the present application, a second elastic member 70 is provided at one end of the arrester core 20 close to the first mounting portion 11, one end of the second elastic member 70 is sleeved on the arrester core 20, and the other end of the second elastic member 70 is elastically abutted against the explosion-proof structure 50, and the central axis of the second elastic member 70, the central axis of the pressure relief hole 41 and the central axis of the explosion-proof structure 50 are collinear, and the outer diameter of the end of the second elastic member 70 close to the sealing cover 40 is greater than the diameter of the pressure relief hole 41.

[0066] In this embodiment, one end of the second elastic member 70 is sleeved on the arrester core 20, and the other end of the second elastic member 70 is elastically abutted against the explosion-proof structure 50. On the one hand, under the elastic force of the second elastic member 70, the explosion-proof structure 50 is pressed against the sealing cover 40, so that the explosion-proof structure 50 blocks the pressure relief hole 41. On the other hand, the arrester core 20 can be limited to prevent the arrester core 20 from shaking left and right in the first installation cavity 13. The outer diameter of the end of the second elastic member 70 close to the sealing cover 40 is greater than the diameter of the pressure relief hole 41, so that the sealing cover 40 bears part of the elastic force of the second elastic member 70, which can prevent the elastic force of the second elastic member 70 from acting entirely on the explosion-proof structure 50 and causing damage to the explosion-proof structure 50.

[0067] In one embodiment, the second elastic member 70 is a conical spring. The central axis of the conical spring, the central axis of the pressure relief hole 41, and the central axis of the explosion-proof structure 50 are collinear. The conical spring has an outer diameter of 32 mm and an inner diameter of 26 mm, and the diameter of the pressure relief hole 41 is 28 mm. This arrangement ensures a pressure relief effect while preventing the entire elastic force of the conical spring from acting on the explosion-proof structure 50, potentially causing rupture of the explosion-proof structure 50.

[0068] With reference to FIG. 1 to FIG. 18 , in one embodiment of the present application, the pressure exerted by the first elastic member 30 on the sealing cover 40 is greater than the pressure exerted by the second elastic member 70 on the sealing cover 40 .

[0069] Through the above arrangement, the sealing cover 40 can be pressed against the open end of the second mounting portion 12 , and the bottom surface of the sealing cover 40 is tightly fitted with the end surface of the second mounting portion 12 , thereby ensuring the sealing effect of the second mounting cavity 14 .

[0070] 1 to 18 , in one embodiment of the present application, the first mounting portion 11 and the second mounting portion 12 are an integrated structure, and a mounting hole 15 communicating with the first mounting cavity 13 is provided at one end of the first mounting portion 11 away from the arrester core 20 .

[0071] In this embodiment, the arrester core 20 passes through the first mounting cavity 13 through the mounting hole 15 and is then installed into the second mounting cavity 14. Since the first mounting portion 11 and the second mounting portion 12 are an integrated structure, no additional connecting structure is required to connect the two, making the overall structure of the arrester relatively simple.

[0072] In one embodiment, the top wall thickness of the first mounting portion 11 is 10 mm, the side wall thickness is 5.5 mm, and the diameter of the mounting hole 15 is 38 mm, which ensures that the arrester core 20 can be inserted into the second mounting cavity 14 from the mounting hole 15 during assembly.

[0073] In one embodiment, the housing 10 is made of ceramic, and the first mounting portion 11 and the second mounting portion 12 can be fired separately and then glued together, or they can be integrally formed and then fired as a whole.

[0074] 1 to 18 , in one embodiment of the present application, the sealing cover 40 is slidably disposed in the first mounting portion 11 and is capable of sliding along the length extension direction of the arrester core 20 .

[0075] In this embodiment, when the pressure in the second installation cavity 14 is too high, the sealing cover 40 can be lifted up, and the sealing cover 40 slides in a direction away from the arrester core 20, and part of the gas flows into the first installation cavity 13 through the open end of the second installation cavity 14, thereby reducing the pressure in the second installation cavity 14.

[0076] With reference to FIG. 1 to FIG. 18 , in one embodiment of the present application, the first installation cavity 13 passes through the first installation portion 11 in a direction perpendicular to the central axis of the arrester.

[0077] In this embodiment, the first installation cavity 13 is connected to the outside world. When the pressure in the second installation cavity 14 exceeds the maximum pressure that the explosion-proof structure 50 can withstand, the explosion-proof structure 50 explodes, and the gas in the second installation cavity 14 is discharged from the pressure relief hole 41 to the first installation cavity 13. Since the first installation cavity 13 is connected to the outside world, the gas in the second installation cavity 14 can be discharged, thereby achieving pressure relief.

[0078] 1 to 18 , in one embodiment of the present application, a limiting groove 43 is provided on the side of the sealing cover 40 facing away from the arrester core 20 , and an end of the first elastic member 30 close to the arrester core 20 is clamped in the limiting groove 43 .

[0079] In this embodiment, the setting of the limiting groove 43 can not only achieve installation positioning and improve installation efficiency, but also limit the first elastic member 30 in the horizontal direction to prevent the first elastic member 30 from moving in the horizontal direction, thereby improving the structural stability of the lightning arrester.

[0080] Referring to Figures 1 to 18 , in one embodiment of the present application, the sealing assembly further includes a sealing ring 60, which is disposed at the end of the second mounting portion 12. The sealing ring 60 is located on a side of the explosion-proof structure 50 away from the first elastic member 30. When the first elastic member 30 presses the sealing cover 40 against the open end of the second mounting portion 12, the sealing cover 40 can press the sealing ring 60 against the open end of the second mounting portion 12.

[0081] Through the above arrangement, the sealing ring 60 can be pressed against the open end of the second mounting portion 12 . The arrangement of the sealing ring 60 can further prevent the first mounting cavity 13 or external air from entering the second mounting cavity 14 , thereby improving the sealing effect.

[0082] Referring to Figures 1 to 18 , in one embodiment of the present application, a mounting groove 42 is provided on the side of the sealing cover 40 facing the arrester core 20 , the depth of the mounting groove 42 is greater than the thickness of the explosion-proof structure 50 , and the depth of the mounting groove 42 is less than the sum of the thicknesses of the explosion-proof structure 50 and the sealing ring 60 , and the end of the arrester core 20 close to the first mounting portion 11 is constructed to be able to press and fix the explosion-proof structure 50 in the mounting groove 42 .

[0083] In the present embodiment, the depth of the mounting groove 42 is greater than the thickness of the explosion-proof structure 50, and the depth of the mounting groove 42 is less than the sum of the thicknesses of the explosion-proof structure 50 and the sealing ring 60. After the explosion-proof structure 50 and the sealing ring 60 are placed in the mounting groove 42 in sequence, the sealing ring 60 can expose the limiting groove 43. When the first elastic member 30 presses the sealing cover 40 against the open end of the housing 10, the portion of the sealing ring 60 that exposes the limiting groove 43 is pressed into the mounting groove 42. The thickness of the portion of the sealing ring 60 that exposes the limiting groove 43 is the compression amount of the sealing ring 60. In actual application, the compression amount of the sealing ring 60 is adjusted by adjusting the depth of the limiting groove 43, the thickness of the explosion-proof structure 50, and the thickness of the sealing ring 60. Under the premise of ensuring the sealing effect, the sealing ring 60 is avoided from being over-pressed and losing its elasticity. Through the above-mentioned arrangement, it is possible to achieve accurate compression of the sealing ring 60, so that the sealing performance of the lightning arrester meets the requirements, and the qualified rate of the lightning arrester product reaches 100%.

[0084] In addition, the first elastic member 30 is used to press the sealing cover 40, and the sealing ring 60 is compressed to achieve sealing of the open end of the second mounting portion 12. Compared with the method of sealing by rolling rivets on the copper end cover, the above-mentioned sealing structure is used for sealing, and different components only need to be installed in the installation order, and the operation process is simpler.

[0085] In one embodiment, the thickness of the sealing ring 60 is 3 mm, the thickness of the explosion-proof structure 50 is 0.8 mm, and the depth of the mounting groove 42 is 2.8 mm. After the sealing ring 60 and the explosion-proof structure 50 are placed in the mounting groove 42, the thickness of the sealing ring 60 exposed in the mounting groove 42 is 1 mm. When the first elastic member 30 presses the sealing cover 40 to the open end of the second mounting portion 12, the maximum compression of the sealing ring 60 is 1 mm, and the compression ratio is approximately 33%.

[0086] In one embodiment, the explosion-proof structure 50 is an explosion-proof disk, the outer diameter of the sealing ring 60 is 64 (0 to -0.5) mm, the outer diameter of the explosion-proof disk is 64 (0 to -0.5) mm, and the inner diameter of the mounting groove 42 is 64 (+0.5 to 0) mm. The above arrangement can ensure that the sealing ring 60 and the explosion-proof disk can be placed in the mounting groove 42.

[0087] Referring to Figures 1 to 18 , in one embodiment of the present application, the arrester further includes a high-voltage terminal wiring assembly 80 , which is installed at an end of the first mounting portion 11 away from the arrester core 20 , and the first elastic member 30 elastically abuts between the high-voltage terminal wiring assembly 80 and the sealing cover 40 .

[0088] In this embodiment, the high-voltage terminal wiring assembly 80 is used to connect to other electrical components on the one hand, and on the other hand, the high-voltage terminal wiring assembly 80 cooperates with the sealing cover 40 to compress the first elastic member 30. The elastic restoring force of the first elastic member 30 presses the sealing cover 40 against the open end of the second mounting portion 12.

[0089] In one embodiment, a square through hole with a width range of 68mm to 72mm and a height range of 48mm to 52mm is provided on the first mounting portion 11, and the inner cavity of the square through hole is the first mounting cavity 13. The above-mentioned width setting can ensure that the first elastic member 30 and the sealing assembly can be installed in the first mounting cavity 13, and the above-mentioned height setting can ensure the compression amount of the first elastic member 30, thereby ensuring the sealing performance of the lightning arrester.

[0090] Preferably, the square through hole has a width of 70 mm and a height of 50 mm.

[0091] In one embodiment, the first elastic member 30 is a spring, the second elastic member 70 is a conical spring, and the sealing ring 60 is located between the sealing cover 40 and the conical spring. The original length of the spring is 79 mm, the height of the square through hole is 50 mm, the thickness of the high-voltage terminal wiring assembly 80 within the square hole is 3 mm, the thickness of the sealing cover 40 is 10 mm, the depth of the mounting groove 42 is 2 mm, the compression of the spring is 79 mm - (50 mm - 3 mm - 10 mm + 2 mm) = 40 mm, and the pressing force on the sealing cover 40 is 588 N. The original length of the conical spring is 39 mm, the compression in normal operation is 10 mm, and the elastic force exerted on the sealing cover 40 is 147 N. The compression in the extreme state is 20 mm, and the elastic force exerted on the sealing cover 40 is 294 N.

[0092] From the above, it can be seen that the pressing force of the first elastic member 30 is much greater than the elastic force applied to the sealing cover 40 by the tower-shaped spring in normal working state and the elastic force applied to the sealing cover 40 in the limit state. This can ensure that the first elastic member 30 presses the sealing cover 40 so that the lower end face of the sealing cover 40 fits with the end face of the second mounting portion 12, thereby ensuring the compression amount of the sealing ring 60.

[0093] Referring to Figures 1 to 18, in one embodiment of the present application, the high-voltage terminal wiring assembly 80 includes a wiring member 81, a limiting member 82 and a locking member 83. One end of the wiring member 81 is located in the first mounting cavity 13 and is in contact with the inner wall of the first mounting portion 11. The other end of the wiring member 81 passes through the mounting hole 15. The limiting member 82 is sleeved on the wiring member 81. The end of the limiting member 82 away from the first elastic member 30 is in contact with the outer wall of the first mounting portion 11. The locking member 83 is used to lock the limiting member 82 on the wiring member 81.

[0094] Through the above arrangement, the high voltage terminal wiring assembly 80 can be fixedly mounted on the first mounting portion 11. Specifically, the limiting member 82 is a nut.

[0095] In one embodiment of the present application, the explosion-proof structure 50 is an explosion-proof disk, and the thickness of the explosion-proof disk ranges from 0.7 mm to 0.9 mm.

[0096] In this embodiment, the thickness of the explosion-proof disk is in the range of 0.7 mm to 0.9 mm, which can ensure the structural strength of the explosion-proof disk.

[0097] In one embodiment, the explosion-proof disk is made of epoxy glass cloth, and the side of the explosion-proof disk facing the sealing ring 60 is copper-plated to increase the smoothness of the surface. When the first elastic member 30 presses the sealing cover 40 against the open end of the shell 10, the side of the explosion-proof disk facing the sealing ring 60 can fit tightly with the sealing ring 60, thereby ensuring the sealing performance of the lightning arrester.

[0098] In one embodiment, the burst disk is an aluminum disk.

[0099] The bursting force of a bursting disk (i.e., the maximum pressure it can withstand) depends on the material and thickness of the bursting disk, is constant, and is not affected by other components or assembly processes.

[0100] In one embodiment, the thickness of the explosion-proof disk is 0.8 mm, and the thickness of the housing 10 is 11.5 mm. The housing 10 and the explosion-proof disk were subjected to a water pressure test, and the bursting force values ​​of the two are shown in Table 2:

[0101] Table 2

[0102] It should be noted that the thickness of the explosion-proof disk is closely related to the pressure relief capacity of the lightning arrester. The smaller the thickness, the better the pressure relief effect. When designing the thickness of the explosion-proof disk, it is necessary to take into account the negative pressure generated when the lightning arrester is subjected to the vacuum test and the pressure generated when the internal temperature of the lightning arrester rises after the protection action. During the vacuum test, the negative pressure is 0.02 (+0.004 ~ 0) MPa. After the lightning arrester is in normal action and protection, the temperature rise of the lightning arrester core 20 generally does not exceed 200 ° C. After measurement, the pressure in the second installation cavity 14 generally does not exceed 0.2 MPa. At the same time, taking into account the 2-fold protection margin, the blasting force value of the explosion-proof disk needs to be greater than 0.4 MPa. When the thickness of the explosion-proof disk is 0.8 mm, a water pressure test is carried out on multiple shells 10 and explosion-proof disks. The blasting force value of the explosion-proof disk is in the range of 0.5 MPa to 0.9 MPa, which meets the design requirement.

[0103] In one embodiment of the present application, the compression amount of the sealing ring 60 is 30% to 35%.

[0104] In this embodiment, the compression amount of the sealing ring 60 is 30% to 35%. In this way, the sealing ring 60 can be prevented from losing its elasticity due to overpressure while ensuring the sealing effect.

[0105] With reference to Figures 1 to 18 , in one embodiment of the present application, the arrester core 20 includes a resistor 21, a gasket 22, a T-bolt 23, a heat shrink tube 24, a gasket 25, and a positioning electrode 26. The positioning electrode 26, the resistor 21, the gasket 22, the T-bolt 23, and the gasket 25 are stacked into a cylindrical core, wherein the resistor 21 is provided at both ends of the gasket 22, the positioning electrode 26 and the T-bolt 23 are respectively located at both ends of the cylindrical core, the gasket 25 is provided between the resistor 21 and the gasket 22, and the heat shrink tube 24 is coated on the outer periphery of the cylindrical core. The number of resistors 21 and gaskets 25 can be set according to actual needs. The assembly process of the arrester core 20 is as follows: determine the specifications and quantity of the resistor 21 according to the assembly parameter requirements of the arrester; stack the resistor 21, positioning electrode 26, gasket 22, T-bolt 23, and gasket 25 into a cylindrical core, and adjust the number of gaskets 25 to make the height of the cylindrical core meet the requirements; put the heat shrink tube 24 on the cylindrical core, heat it and then shrink it to fix it.

[0106] The arrester also includes a V-shaped sealing ring 90, a flat washer, a spring washer and a nut, and the housing 10 is provided with a through hole 16 at one end away from the first mounting portion 11. The assembly process of the arrester is as follows: the V-shaped sealing ring 90 is sleeved on the T-bolt 23 at the lower end of the arrester core 20; the second elastic member 70 is sleeved on the positioning electrode 26 at the upper end of the arrester core 20; then the arrester core 20 with the V-shaped sealing ring 90 and the second elastic member 70 is installed into the second mounting cavity 14; the high-voltage terminal wiring assembly 80 is installed on the first mounting portion 11; the sealing ring 60, the explosion-proof structure 50 and the sealing cover 40 are placed on the end face of the open end of the second mounting portion 12 in sequence; the sealing cover 40 is pressed downward, and the first elastic member 30 is installed into the first mounting cavity 13 at the same time, and finally the T-bolt 23 is passed through the through hole 16 and fastened by the flat washer, the spring washer and the nut.

[0107] It should be noted that the materials of flat washers, spring washers and nuts are Q235 hot-dip galvanized or 304 stainless steel or 316 stainless steel.

[0108] In one embodiment, the sealing cover 40 is made of Q235 electro-galvanized steel or 304 stainless steel.

[0109] From the above description, it can be seen that the above-mentioned embodiment of the present application achieves the following technical effects: the first mounting cavity serves as a pressure relief space, the first elastic member 30 presses the sealing cover against the open end of the second mounting portion, the bottom surface of the sealing cover is tightly fitted with the end surface of the open end of the second mounting portion, and the explosion-proof structure blocks the pressure relief hole on the sealing cover to achieve sealing of the second mounting cavity. When the pressure in the second mounting cavity is greater than the maximum limit pressure that the explosion-proof structure can withstand, the explosion-proof structure is damaged and a rupture is generated, and the gas in the second mounting cavity is discharged into the first mounting cavity through the pressure relief hole, achieving pressure relief, thereby preventing the shell from exploding. Compared with the prior art method of using a groove on the copper end cap as a weak point, the explosion-proof structure of the present application is independently arranged from the shell and the sealing cover. The compressive strength of the explosion-proof structure is not affected by the structural error, material selection, and processing technology of the shell and the sealing cover. The compressive strength of the explosion-proof structure is determinable and constant, that is, the explosion value of the explosion-proof structure (the maximum pressure value at which the explosion-proof structure is damaged) is determinable and stable.

[0110] Obviously, the embodiments described above are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0111] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0112] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A lightning arrester, characterized in that, Comprising: A housing (10), the housing (10) includes a first mounting portion (11) and a second mounting portion (12), the first mounting portion (11) has a first mounting cavity (13), the second mounting portion (12) has a second mounting cavity (14), the first mounting cavity (13) communicates with the second mounting cavity (14), and in a direction perpendicular to the central axis of the lightning arrester, the first mounting cavity (13) penetrates through the first mounting portion (11); A lightning arrester core body (20), installed in the second mounting cavity (14); A sealing assembly, the sealing assembly is installed in the first mounting cavity (13), the sealing assembly includes a first elastic member (30) and a sealing cover (40), the first elastic member (30) is used to press the sealing cover (40) against the open end of the second mounting portion (12), one end of the first elastic member (30) abuts against the top of the first mounting portion (11), the other end of the first elastic member (30) abuts against the sealing cover (40), and a pressure relief hole (41) communicating with the second mounting cavity (14) is provided on the sealing cover (40); and An explosion-proof structure (50), the strength of the explosion-proof structure (50) is less than the strength of the housing (10), the explosion-proof structure (50) is located between the sealing cover (40) and the lightning arrester core body (20), the explosion-proof structure (50) is configured to be able to block the pressure relief hole (41) to achieve the sealing of the second mounting cavity (14), when the pressure in the second mounting cavity (14) is greater than the maximum limit pressure that the explosion-proof structure (50) can withstand, the explosion-proof structure (50) is damaged to generate a break.

2. The lightning arrester according to claim 1, characterized in that, One end of the lightning arrester core body (20) close to the first mounting portion (11) is provided with a second elastic member (70), one end of the second elastic member (70) is sleeved on the lightning arrester core body (20), the other end of the second elastic member (70) elastically abuts against the explosion-proof structure (50), the central axis of the second elastic member (70), the central axis of the pressure relief hole (41) and the central axis of the explosion-proof structure (50) are collinear, and the outer diameter of one end of the second elastic member (70) close to the sealing cover (40) is greater than the diameter of the pressure relief hole (41).

3. The lightning arrester according to claim 2, characterized in that, The pressure of the first elastic member (30) on the sealing cover (40) is greater than the pressure of the second elastic member (70) on the sealing cover (40).

4. The lightning arrester according to claim 1, characterized in that, The first mounting portion (11) and the second mounting portion (12) are of an integral structure, and an installation hole (15) communicating with the first mounting cavity (13) is provided at one end of the first mounting portion (11) away from the lightning arrester core body (20).

5. The lightning arrester according to claim 1, characterized in that, The sealing cover (40) is slidably arranged in the first mounting portion (11) and can slide along the length extension direction of the lightning arrester core body (20).

6. The lightning arrester according to claim 1, characterized in that, A limiting groove (43) is provided on one side of the sealing cover (40) facing away from the arrester core body (20), and one end of the first elastic member (30) close to the arrester core body (20) is clamped in the limiting groove (43).

7. The lightning arrester according to claim 1, characterized in that, The sealing assembly further includes a sealing ring (60). The sealing ring (60) is arranged at the end of the second mounting portion (12). The sealing ring (60) is located on the side of the explosion-proof structure (50) away from the first elastic member (30). When the first elastic member (30) presses the sealing cover (40) against the open end of the second mounting portion (12), the sealing cover (40) can press the sealing ring (60) against the open end of the second mounting portion (12).

8. The lightning arrester according to claim 7, characterized in that, An installation groove (42) is provided on one side of the sealing cover (40) facing the arrester core body (20). The depth of the installation groove (42) is greater than the thickness of the explosion-proof structure (50), and the depth of the installation groove (42) is less than the sum of the thicknesses of the explosion-proof structure (50) and the sealing ring (60). One end of the arrester core body (20) close to the first mounting portion (11) is configured to be able to press and fix the explosion-proof structure (50) in the installation groove (42).

9. The lightning arrester according to claim 4, characterized in that, The arrester further includes a high-voltage terminal wiring assembly (80). The high-voltage terminal wiring assembly (80) is installed at one end of the first mounting portion (11) away from the arrester core body (20), and the first elastic member (30) elastically abuts between the high-voltage terminal wiring assembly (80) and the sealing cover (40).

10. The lightning arrester according to claim 9, characterized in that, The high-voltage terminal wiring assembly (80) includes a wiring member (81), a limiting member (82), and a first locking member (83). One end of the wiring member (81) is located in the first installation cavity (13) and fits against the inner wall of the first mounting portion (11). The other end of the wiring member (81) passes through the installation hole (15). The limiting member (82) is sleeved on the wiring member (81). One end of the limiting member (82) away from the first elastic member (30) fits against the outer wall of the first mounting portion (11). The first locking member (83) is used to lock the limiting member (82) on the wiring member (81).

11. The lightning arrester according to claim 1, characterized in that, The explosion-proof structure (50) is an explosion-proof film, and the value range of the thickness of the explosion-proof film is 0.7 mm to 0.9 mm.

12. The lightning arrester according to claim 7, characterized in that, The compression amount of the sealing ring (60) is 30% to 35%.

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