A composite insulation outdoor intelligent AC lightning arrester

Abstract

The present invention discloses a composite-insulated outdoor intelligent AC lightning arrester, which relates to the technical field of lightning arresters and includes terminals located at the upper and lower ends of the arrester; a sealing ring assembly arranged on the terminal and coaxially sleeved on the outside of the terminal seat, including a threaded limiting ring and a fixing ring, and the fixing ring is respectively provided with an expansion bag and a rubber ring. The composite-insulated outdoor intelligent AC lightning arrester is restricted by the limiting ring so that the fixing ring is tightly attached to the terminal seat, avoiding the formation of a gap between the terminal seat and the terminal, and the terminal seat is integrally formed with the silicone rubber sleeve by compression molding, reducing the gap caused by assembly during the production process, and the tear cord is buried in the silicone rubber sleeve during the assembly process. When recycling is required, the silicone rubber sleeve is separated by pulling the tear cord, which not only meets the demand for reuse, but also avoids the problem of loose sealing when using a set.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning arresters, in particular to a composite-insulated outdoor intelligent AC lightning arrester. Background Art

[0002] Lightning arresters are key protective devices used to limit overvoltages (such as lightning overvoltage and operating overvoltage) in power systems. Their core function is to quickly release energy through nonlinear resistance characteristics to protect electrical equipment from damage.

[0003] In conjunction with publication number CN118824658B, publication date 2024-12-17, a lightning arrester is disclosed, including two end caps, a plurality of resistors arranged between the two end caps and arranged in a direction from one end cap to the other end cap, a plurality of limit struts connecting the two end caps and distributed around the periphery of the variable resistors, and an insulating shell mounted outside the limit struts, and also including: a locking mechanism that cooperates with the limit struts to drive the two end caps to move toward each other, the end caps are provided with a non-return mechanism that cooperates with the locking mechanism and the insulating shell to limit the action of the locking mechanism, and the two ends of the insulating shell are provided with a sealing fixing mechanism that is detachably sealed with the end caps.

[0004] However, in the prior art including the above-mentioned patent, in order to facilitate the disassembly of the insulating shell, the insulating shell is assembled in a set manner, and the two ends of the insulating shell are connected to the end caps through a locking mechanism, which results in a gap between the inner wall of the insulating shell and the limit support and the variable resistor block.

[0005] The locking mechanism can provide axial limitation for the insulating shell, but after long-term use, the end cap is subjected to a large thermal effect of the current during a lightning strike, making the insulating shell near the end cap more prone to brittleness and aging due to high temperature. At this time, the extrusion pressure in the locking mechanism will promote the deformation of the end of the insulating shell, causing a gap between the insulating shell and the locking mechanism, reducing the sealing effect, and leading to the intrusion of water vapor and moisture. Summary of the Invention

[0006] The purpose of the present invention is to provide a composite-insulated outdoor intelligent AC lightning arrester to solve the above-mentioned problems.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a composite-insulated outdoor intelligent AC lightning arrester, comprising wiring terminals located at the upper and lower ends of the lightning arrester and a varistor block disposed between the wiring terminals, a support bar disposed on the outer wall of the varistor block, a silicone rubber sleeve molded around the outer periphery of the support bar, and an intelligent detection module, comprising a terminal block glued to the opposite sides of the wiring terminals and abutting the varistor block;

[0008] A sealing ring assembly is provided on the terminal and coaxially sleeved on the outside of the terminal block, comprising a threaded limiting ring and a fixing ring, wherein the port of the fixing ring is squeezed by the limiting ring and has a radially contracted state, and the fixing ring is respectively provided with an expansion bag and a rubber ring;

[0009] The locking pieces used to limit the positions of the limiting ring and the fixing ring are relatively arranged at the upper and lower ends of the lightning arrester, and a tear rope for cutting the silicone rubber sleeve is arranged between the two locking pieces.

[0010] Preferably, the sealing ring assembly is provided with a circumferential array of fixed plug rods for clamping the terminal.

[0011] Preferably, the top end of the fixing rod extends into the terminal, and the fixing rod is connected to the expansion bag to transport the overflow gas from the adhesive surface of the terminal seat.

[0012] Preferably, a plurality of positioning rocker arms are rotatably provided on the fixing ring, and the positioning rocker arms switch between inclined or vertical states as the limiting ring moves, so as to introduce or position the support bars.

[0013] Preferably, a cavity for communicating with a rubber ring is provided on the tail end of the positioning rocker, and in the tilted state, the rubber ring is offset from the cavity and communicated with the outside.

[0014] Preferably, the rubber ring is communicated with the expansion bladder.

[0015] Preferably, the expansion bag has an opening communicating with the outside, and the limiting ring has a low position in its movable stroke for blocking the opening.

[0016] Preferably, the limiting ring is fixedly provided with an embedding portion for embedding into the fixing ring, and the cross section of the embedding portion is wedge-shaped.

[0017] Preferably, the end of the locking member extends out of the sealing ring assembly, and a lead for grounding is fixedly provided on the locking member.

[0018] Preferably, a ring groove corresponding to the rubber ring is provided on the terminal seat.

[0019] In the above technical solution, the present invention provides a composite insulated outdoor intelligent AC lightning arrester, which has the following beneficial effects: the fixing ring is restricted by the limiting ring to make it close to the terminal seat, thereby avoiding the formation of a gap between the terminal seat and the terminal, and the terminal seat is integrally formed with the silicone rubber sleeve by injection molding, thereby reducing the gap caused by assembly during the production process, and the tear rope is buried in the silicone rubber sleeve during the assembly process. When recycling is required, the silicone rubber sleeve is separated by pulling the tear rope, which not only meets the demand for reuse, but also avoids the problem of loose sealing when using a set. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 An overall three-dimensional schematic diagram provided for an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the cross-sectional structure of a lightning arrester provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the positions of the terminal, sealing ring assembly and terminal block provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the cross-sectional structure of a sealing ring assembly and a terminal block provided in an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a sealing ring assembly provided in an embodiment of the present invention;

[0026] Figure 6 A schematic cross-sectional view of the sealing ring assembly structure provided by an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of the structure of the limiting ring, fixing ring and positioning rocker provided in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the positioning rocker structure provided by an embodiment of the present invention;

[0029] Figure 9 A schematic diagram of the locking member and tear cord structure provided by an embodiment of the present invention;

[0030] Figure 10 The embodiment of the present invention provides Figure 4 A magnified schematic diagram of the structure in the middle;

[0031] Figure 11 The embodiment of the present invention provides Figure 6 A magnified schematic diagram of the structure B in the middle.

[0032] Description of reference numerals:

[0033] 1. Sealing ring assembly; 11. Limiting ring; 111. Embedded part; 112. Internal thread; 113. External thread; 114. External groove; 12. Fixing ring; 121. Recessed part; 122. Internal screw groove; 123. External screw groove; 13. Fixing rod; 14. Internal groove; 15. Rubber ring; 151. Second channel; 152. Third channel; 16. Expansion bladder; 161. First channel; 2. Terminal; 3. Silicone rubber sleeve; 4. Positioning rocker; 41. Fixing rod; 42. Cavity; 43. Fourth channel; 44. Rotating disk; 45. Teeth; 5. Locking piece; 51. Lead wire; 52. Tear rope; 6. Variable resistor block; 7. Support bar; 8. Terminal seat; 81. Ring groove. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1-11 As shown, a composite insulated outdoor intelligent AC lightning arrester includes terminals 2 at the upper and lower ends of the lightning arrester and a varistor block 6 arranged between the terminals 2, a support bar 7 arranged on the outer wall of the varistor block 6, a silicone rubber sleeve 3 molded on the outer periphery of the support bar 7, and an intelligent detection module, such as Figure 2 Also includes a terminal block 8 glued to the opposite side of the terminal 2 and abutting the varistor block 6, as Figure 3 As shown, the gap between the top of the sealing ring assembly 1 and the terminal 2 is the adhesive space;

[0036] The sealing ring assembly 1 is provided on the terminal 2 and coaxially sleeved on the outside of the terminal block 8, and comprises a threaded limiting ring 11 and a fixing ring 12, wherein the end of the fixing ring 12 is squeezed by the limiting ring 11 and has a radial contraction state, and the fixing ring 12 is respectively provided with an expansion bag 16 and a rubber ring 15 (such as Figure 5 and Figure 6 shown);

[0037] It also includes a locking member 5 (such as a locking member 5) for limiting the position of the limiting ring 11 and the fixing ring 12. Figure 4 As shown), it is relatively arranged at the upper and lower ends of the arrester, and a tear rope 52 for cutting the silicone rubber sleeve 3 is provided between the two locking members 5 (as shown Figure 9 shown).

[0038] Specifically, a circumferential array of grooves for accommodating the ends of the support bars 7 is provided on the terminal seat 8, and the support bars 7 are made of glass fiber, the variable resistor block 6 is a zinc oxide valve plate, and the tear rope 52 is made of aramid fiber.

[0039] Furthermore, the specific assembly process is: first, the sealing ring assembly 1 is detachably installed on the opposite surface of the terminal 2, and then, glue is applied in the adhesive space of the terminal 2 surrounded by the sealing ring assembly 1, and then the terminal seat 8 is coaxially inserted into the sealing ring assembly 1, and the annular groove 81 opened on the terminal seat 8 is clamped with the rubber ring 15, and the top of the terminal seat 8 is fully contacted and fixed with the glue in the adhesive space.

[0040] The limiting ring 11 is fixed with an external thread 113, and the fixing ring 12 is provided with an external screw groove 123 corresponding to the position of the external thread 113, and the circle diameter of the external screw groove 123 increases from top to bottom (such as Figure 6 As shown). The limiting ring 11 has a completely disconnected gap, while the fixing ring 12 has a blind hole that is not completely disconnected. The lower end of the blind hole extends to the end of the fixing ring 12 and is drilled through toward the inner wall, so that there is a break at the end of the fixing ring 12 (as shown). Figure 6 As shown in the figure, the limiting ring 11 and the fixing ring 12 are provided with an outer groove 114 and an inner groove 14 at the position of the notch and the blind hole, respectively. After the terminal block 8 is fixed, the limiting ring 11 is rotated again. The limiting ring 11 rotates along the outer screw groove 123 and moves downward. At the same time, the gradually increasing outer screw groove 123 is squeezed by the outer thread 113, so that the port of the fixing ring 12 slowly converges, and the convergence margin is released through the space of the fracture, preventing the fixing ring 12 from cracking due to internal stress concentration. The fixing ring 12 further fixes the terminal block 8, and the restriction of the limiting ring 11 makes the fixing ring 12 close to the terminal block 8, further achieving sealing.

[0041] like Figure 5 As shown, in the above process, the fixed ring 12 is constrained by the limit ring 11 and the port is reduced, and the spacing of the inner groove 14 is reduced, while the limit ring 11 is slightly expanded by the reaction force of the fixed ring 12, and the spacing of the outer groove 114 is increased. When the outer groove 114 of the limit ring 11 corresponds to the position of the inner groove 14, a through groove is formed between the outer groove 114 and the inner groove 14, and the spacing of the through groove gradually decreases from the outside to the inside. Figure 3 As shown, the locking piece 5 is inserted into the two through grooves (i.e., the outer groove 114 and the inner groove 14) located at the upper and lower ends of the sealing ring assembly 1 of the lightning arrester, and the positions of the limiting ring 11 and the fixing ring 12 are fixed by the locking piece 5, and the locking piece 5 is clamped and fixed by the through groove, and the tear rope 52 between the two locking pieces 5 is tightly attached to the outer wall of the variable resistance block 6.

[0042] Multiple varistor blocks 6 are stacked between two terminal blocks 8, connected in series to form a nonlinear resistor. The ends of multiple support bars 7 are then placed in the grooves on the sides of the terminal blocks 8, vertically constraining the central varistor block 6 via the support bars 7. Finally, an injection molding mechanism is used to apply a mold around the periphery of the support bars 7 (the mold being positioned between the facing sides of the two sealing ring assemblies 1). Silicone rubber material is injected into the mold, which cools and forms a flexible silicone rubber sleeve 3. Injection molding reduces the gap between the silicone rubber sleeve 3 and the varistor block 6, and the tear cord 52 is located within the silicone rubber sleeve 3.

[0043] When the silicone rubber sleeve 3 is aged and needs to be replaced, first pull out the two locking pieces 5, then rotate the limit ring 11 upward to loosen the port of the fixing ring 12, and pull one of the locking pieces 5 along the axial direction of the lightning arrester, so that the tear rope 52 is tensioned and cuts the silicone rubber sleeve 3 along the pulling direction, so that the silicone rubber sleeve 3 is cut, and the silicone rubber sleeve 3 can be quickly peeled off along the cutting line. Then, the support bar 7 and the variable resistor block 6 can be removed as needed for recycling.

[0044] The intelligent detection module uses an infrared or imaging device to scan the entire arrester, transmit the information to a screen for real-time feedback, and highlight high-temperature areas. To facilitate monitoring by maintenance personnel, the aforementioned electronic components can utilize an infrared device for valve body flaw detection, as disclosed in Publication No. CN105223203B, published on April 10, 2018. This is a conventional detection module well known to those skilled in the art and will not be described in detail here.

[0045] In the above technology, the fixing ring 12 is restricted by the limiting ring 11 to make it close to the terminal seat 8, avoiding the formation of a gap between the terminal seat 8 and the terminal 2, and the terminal seat 8 is integrally formed with the silicone rubber sleeve 3 by injection molding, reducing the gap caused by assembly during the production process, and the tear rope 52 is buried in the silicone rubber sleeve 3 during the assembly process. When recycling is required, the silicone rubber sleeve 3 is separated by pulling the tear rope 52, which not only meets the needs of reuse, but also avoids the problem of loose sealing when using a set.

[0046] As a further embodiment provided by the present invention, a fixing rod 13 for clamping the terminal 2 is provided in a circumferential array on the sealing ring assembly 1 .

[0047] Specifically, the fixed rod 13 is fixedly arranged on the upper end of the fixed ring 12, such as Figure 3As shown, a rectangular groove corresponding to the fixed plug rod 13 is provided on the terminal 2. When assembling the sealing ring assembly 1, the fixing ring 12 is first inserted into the fixing plug rod 13 along the rectangular groove. At this time, an adhesive space is formed between the inner ring of the fixing ring 12 and the end face of the terminal 2. The fixing ring 12 is fixed by injecting glue into the space, and a rainproof layer can be formed between the terminal 2 and the terminal seat 8 through the adhesive surface to prevent rainwater from penetrating. The adhesive material uses modified epoxy resin.

[0048] As another embodiment provided by the present invention, the top end of the fixing rod 13 extends into the terminal 2 , and the fixing rod 13 is connected to the expansion bag 16 to transport the overflow gas from the adhesive surface of the terminal block 8 .

[0049] Specifically, such as Figure 4 As shown, in order to achieve sealing, the outer wall of the terminal seat 8 is tightly fitted with the inner wall of the fixing ring 12, and a closed environment is formed between the terminal seat 8, the fixing ring 12 and the terminal 2. The small amount of air originally existing at the upper end of the terminal seat 8 will be squeezed into the adhesive space during the process of plugging the terminal seat 8, causing bubbles to exist in the adhesive space.

[0050] In order to alleviate this problem, the top end of the fixed rod 13 is an open hollow structure, and the top end is connected to the expansion bag 16 through the first channel 161 opened in the fixed ring 12, as shown in FIG. Figure 7 As shown. When assembling the sealing ring assembly 1, the top end of the fixed rod 13 is inserted into the rectangular groove of the terminal 2, and the bottom end of the fixed rod 13 is located below the end face of the terminal 2, that is, the bottom end of the fixed rod 13 is located in the adhesive space, while the top end of the fixed rod 13 is offset from the adhesive space, so that the glue enters along the gap between the rectangular groove and the fixed rod 13. Due to the tension of the glue itself and the resistance to the glue caused by the narrow gap, the glue will not reach the top end of the fixed rod 13. During the process of plugging in the terminal block 8, the air on the end face of the terminal block 8 is squeezed into the adhesive space to form bubbles. Since the bubbles are light and are squeezed upward by the terminal block 8 (the terminal block 8 at the lower end squeezes the bubbles downward), the bubbles will automatically float upward. The bubble is located at the top layer of the adhesive space, and then, under the restriction of the end face of the terminal 2, the bubble enters the rectangular groove along the gap between the rectangular groove and the fixed rod 13. When entering the rectangular groove, the bubble breaks through the surface tension of the glue and ruptures. The air in the bubble then enters the first channel 161 through the hollow structure, and enters the expansion bag 16 through the first channel 161, causing the expansion bag 16 to expand slightly.

[0051] When the glue is completely cured, the adhesive surface becomes brittle and may cause gaps or cracks between the fixing ring 12, the terminal 2 and the terminal seat 8, resulting in a weakening of the rainproof effect of the adhesive space, allowing rain or moisture to enter. This is difficult to avoid in the existing technology, and the temperature abnormality of the lightning arrester can only be detected by the intelligent detection module when a lightning strike occurs. At this time, it is difficult for maintenance personnel to carry out maintenance work on site; when the above technical solution is adopted, when the lightning arrester is struck by overload lightning, the heat released by the current causes the water vapor in the adhesive space to evaporate, the air expands and flows along the gap caused by the curing of the glue, and enters the top of the fixed rod 13, and finally overflows to the expansion bag 16 along the first channel 161, so as to avoid the air in the adhesive space from being released in time and the mechanical stress generated causing the lightning arrester to explode.

[0052] As another embodiment provided by the present invention, a plurality of positioning rocker arms 4 are rotatably provided on the fixing ring 12 , and the positioning rocker arms 4 switch between inclined or vertical states as the limiting ring 11 moves, so as to introduce or position the support bar 7 .

[0053] Specifically, a plurality of teeth 45 meshing with the external thread 113 are arranged in a circular array on the head end of the positioning rocker 4, wherein the teeth 45 are tangent to the screw groove between the external thread 113. During the downward movement of the external thread 113, the screw groove presses the teeth 45 downward, causing the teeth 45 to deflect as the external thread 113 moves downward, forming a structure similar to a worm gear, wherein the thread lead angle of the external thread 113 needs to be complementary to the helix angle of the teeth 45. Figure 7 As shown, in its default state, the positioning lever 4 is tilted as indicated by the dashed line. At this point, the limiting ring 11 is located in the dashed position. The multiple positioning levers 4 form a gradually narrowing, bucket-shaped guide space from bottom to top, allowing the end of the support bar 7 to enter through the guide space. The limiting ring 11 then rotates while moving downward to the solid line position, driving the positioning lever 4 to swing toward the variable resistor block 6. The positioning lever 4 swings from the outside to the inside, clamping and securing the support bar 7. This differs from the prior art method of using heat-curing tape to secure the support bar 7. This avoids the problem of poor heat dissipation caused by excessive and dense wrapping of the heat-curing tape around the support bar 7.

[0054] As another embodiment provided by the present invention, a cavity 42 for communicating with the rubber ring 15 is opened on the tail end of the positioning rocker 4, and in the tilted state, the rubber ring 15 is offset from the cavity 42 and communicates with the outside.

[0055] Specifically, a fixing rod 41 (such as Figure 4 As shown), the first end of the positioning rocker 4 is a rotating disk 44, and the rotating disk 44 is separated by an arc plate to form a fourth channel 43, wherein the fourth channel 43 is connected to the cavity 42 (as shown Figure 8As shown, a second channel 151 is fixedly provided on the rubber ring 15 (as shown Figure 7 shown).

[0056] Combine Figure 7 and Figure 8 In its default state, positioning rocker 4 is tilted as shown by the dotted line. Fourth channel 43 is offset from the end of second channel 151, while the end of second channel 151 points toward the open space between rotating disk 44 and the curved plate. This space is open to the outside world and unenclosed. At this point, when terminal block 8 is inserted into retaining ring 12, annular groove 81 squeezes rubber ring 15, allowing air within rubber ring 15 to flow directly to the outside world through second channel 151, thus achieving adaptive regulation.

[0057] As the limiting ring 11 is rotated and moved downward to limit the terminal seat 8, the positioning swing rod 4 is rotated toward the terminal seat 8 to a vertical state. At this time, the second channel 151 is aligned with the fourth channel 43. Figure 7 As shown by the solid line part in .

[0058] Since the fixing rod 41 is inserted into the support bar 7 as the positioning rocker 4 swings, it plays a role in fixing the support bar 7 and also makes the distance between the fixing rod 41 and the variable resistor block 6 closer. In the prior art, the variable resistor block 6 generates heat when the high-voltage current passes through it during the operation of the lightning arrester. However, the heat is within the threshold range during normal use. The heat accelerates the aging of the silicone rubber sleeve 3 and causes the sealing effect of the silicone rubber sleeve 3 to deteriorate, resulting in a gap between the inner wall of the silicone rubber sleeve 3 and the support bar 7. Moisture enters the terminal 2 and the terminal seat 8 at the upper and lower ends through the gap, which can easily lead to a high-voltage breakdown accident, thereby causing the lightning arrester to malfunction. In the present invention, the heat will be transferred to the cavity 42 through the fixing rod 41, so that the gas in the cavity 42 enters the rubber ring 15, causing the rubber ring 15 to expand, thereby preventing moisture from entering the terminal 2 and the terminal seat 8 along the gap in the inner wall of the silicone rubber sleeve 3.

[0059] As another embodiment provided by the present invention, the expansion bag 16 has an opening 162 communicating with the outside, and the limiting ring 11 has a low position for blocking the opening 162 during its movable stroke.

[0060] Specifically, the position of the opening 162 is as follows Figure 10 and Figure 11 As shown, it is located at the bottom of the expansion bladder 16 facing the outside. In the default state, the side of the limiting ring 11 is located above the opening 162 and does not block the opening 162, allowing the air in the expansion bladder 16 to enter between the limiting ring 11 and the fixing ring 12 through the opening 162. Since the limiting ring 11 itself does not have sealing properties, the opening 162 is connected to the outside, and the rubber ring 15 is also connected to the outside and deforms in accordance with the annular groove 81.

[0061] Then, the limiting ring 11 is rotated downward to block the opening 162, causing the expansion bag 16 and the rubber ring 15 to be closed, and the rubber ring 15 is connected to the expansion bag 16 through the third channel 152. When the lightning arrester is struck by overload lightning, the heat released by the current causes the water vapor in the adhesive space to evaporate, and the expanded air eventually overflows along the first channel 161 to the expansion bag 16, and part of it enters the rubber ring 15 through the third channel 152, isolating the adhesive space and the inner wall of the silicone rubber sleeve 3, thereby preventing air from entering the silicone rubber sleeve 3 and causing the seal to fail.

[0062] Moreover, during long-term use, the heat released by the variable resistor block 6 will slowly affect the silicone rubber sleeve 3. Since the process is slow and does not exceed the threshold value, and the heat release is mainly concentrated on the inner wall of the silicone rubber sleeve 3, it is difficult to observe directly. Through the design of the present invention, under normal use, the variable resistor block 6 releases less heat, so that the air in the cavity 42 mainly enters the rubber ring 15. After long-term use, the heat release of the variable resistor block 6 causes the air in the cavity 42 to slowly expand. The space in the rubber ring 15 is insufficient to accommodate the expanded air, and the air will enter the expansion bag 16. The bulging of the expansion bag 16 intuitively reminds the relevant maintenance personnel.

[0063] As another embodiment provided by the present invention, an embedding portion 111 for embedding into the fixing ring 12 is fixedly provided on the limiting ring 11 , and the cross section of the embedding portion 111 is wedge-shaped.

[0064] Specifically, the structures of the fixing ring 12 and the limiting ring 11 are as follows: Figure 6 As shown, the fixing ring 12 is provided with a recessed portion 121 specifically for accommodating the embedded portion 111, wherein the inner wall of the embedded portion 111 is provided with an internal thread 112, and the inner wall of the recessed portion 121 is provided with an internal screw groove 122 corresponding to the internal thread 112. Figure 7 When the default state shown by the dotted line is rotated downward, the embedded portion 111 is inserted into the recessed portion 121, causing extrusion on the middle part of the inner wall of the fixing ring 12, and preventing the limiting ring 11 from detaching, thereby improving the fixing effect on the terminal seat 8. At the same time, it can reach the lowest point through the limiting ring 11, completely covering the outer screw groove 123 on the fixing ring 12 and the head end of the positioning rocker 4, to prevent these movable parts from being attached to the injection liquid during the injection molding process.

[0065] As another embodiment provided by the present invention, the end of the locking member 5 extends out of the sealing ring assembly 1 , and a lead 51 for grounding is fixedly provided on the locking member 5 .

[0066] Specifically, the end of the locking member 5 is located outside the sealing ring assembly 1. When it rains, rainwater forms a water film along the outer wall of the silicone rubber sleeve 3, and the water film will cover the end surface of the locking member 5. If the high-voltage current flashes along the surface of the insulating material, the conductive path formed by the water film will be directly connected to the ground along the lead 51.

[0067] Working Principle: First, removably install the sealing ring assembly 1 on the facing surface of the terminal 2. Insert the top end of the fixing rod 13 into the rectangular groove of the terminal 2. At this point, the bottom end of the fixing rod 13 is located below the end face of the terminal 2, that is, the bottom end of the fixing rod 13 is located in the adhesive space, while the top end of the fixing rod 13 is offset from the adhesive space. Subsequently, glue is applied to the adhesive space surrounded by the sealing ring assembly 1 on the terminal 2. The terminal block 8 is then coaxially inserted into the sealing ring assembly 1. The annular groove 81 on the terminal block 8 engages with the rubber ring 15, and the top end of the terminal block 8 is ensured to fully contact and secure the adhesive in the adhesive space.

[0068] After the terminal block 8 is fixed, the limiting ring 11 is rotated again. The limiting ring 11 rotates and moves downward along the outer screw groove 123. At the same time, the gradually enlarging outer screw groove 123 is squeezed by the outer thread 113, and the embedded portion 111 is inserted into the recessed portion 121, squeezing the middle part of the inner wall of the fixing ring 12. This can prevent the limiting ring 11 from detaching, improve the fixing effect on the terminal block 8, and at the same time, it can reach the lowest point through the limiting ring 11, completely covering the outer screw groove 123 on the fixing ring 12 and the head end of the positioning rocker 4. While the limiting ring 11 rotates, it moves downward to the solid line position, driving the positioning rocker 4 to swing toward the direction of the variable resistor block 6. The positioning rocker 4 swings from the outside to the inside and clamps the fixed support bar 7.

[0069] When the outer card slot 114 of the limiting ring 11 corresponds to the inner card slot 14, a through slot is formed between the outer card slot 114 and the inner card slot 14. Figure 3 As shown, the locking piece 5 is inserted into the upper and lower through grooves, and the positions of the limiting ring 11 and the fixing ring 12 are fixed by the locking piece 5, and the locking piece 5 is clamped and fixed by the through grooves, and the tear rope 52 between the two locking pieces 5 is tightly attached to the outer wall of the variable resistance block 6.

[0070] Multiple varistor blocks 6 are stacked between two terminal blocks 8, connected in series to form a nonlinear resistor. The ends of multiple support bars 7 are then placed in the grooves on the sides of the terminal blocks 8, vertically constraining the central varistor block 6 via the support bars 7. Finally, an injection molding mechanism is used to apply a mold around the periphery of the support bars 7 (the mold being positioned between the facing sides of the two sealing ring assemblies 1). Silicone rubber material is injected into the mold, which cools and forms a flexible silicone rubber sleeve 3. Injection molding reduces the gap between the silicone rubber sleeve 3 and the varistor block 6, and the tear cord 52 is located within the silicone rubber sleeve 3.

[0071] When the glue is completely cured, the adhesive surface becomes brittle and may cause gaps or cracks between the fixing ring 12, the terminal 2 and the terminal seat 8, resulting in a weakening of the rainproof effect of the adhesive space, allowing rain or moisture to enter, which is difficult to avoid in the prior art; and when the above-mentioned technical solution is adopted, when the lightning arrester is struck by overload lightning, the heat released by the current causes the water vapor in the adhesive space to evaporate, the air expands and flows along the gap caused by the curing of the glue, and enters the top of the fixed rod 13, and finally overflows to the expansion bag 16 along the first channel 161, so as to avoid the air in the adhesive space from being released too late, and the mechanical stress generated causes the lightning arrester to explode, and by observing the expansion of the expansion bag 16, it can be intuitively known that the lightning arrester has an internal moisture problem and is replaced in time.

[0072] When replacement is required, first pull out the two locking pieces 5, then rotate the limit ring 11 upward to loosen the port of the fixing ring 12, and pull one of the locking pieces 5 along the axial direction of the lightning arrester, so that the tear rope 52 is tensioned and cuts the silicone rubber sleeve 3 along the pulling direction, so that the silicone rubber sleeve 3 is cut, and the silicone rubber sleeve 3 can be quickly peeled off along the cutting line. Then, the support bar 7 and the variable resistor block 6 can be removed as needed for recycling.

[0073] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A composite insulated outdoor intelligent AC lightning arrester, comprising terminals at the upper and lower ends of the arrester and a varistor block disposed between the terminals, a support bar disposed on the outer wall of the varistor block, a silicone rubber sleeve molded around the outer periphery of the support bar, and an intelligent detection module, characterized in that: It includes a terminal seat glued to the opposite sides of the terminal and abutting against the varistor block; A sealing ring assembly is provided on the terminal and coaxially sleeved on the outside of the terminal block, comprising a threaded limiting ring and a fixing ring, wherein the port of the fixing ring is squeezed by the limiting ring and has a radially contracted state, and the fixing ring is respectively provided with an expansion bag and a rubber ring; Locking pieces for limiting the position of the limiting ring and the fixing ring are relatively arranged at the upper and lower ends of the arrester, and a tear rope for cutting the silicone rubber sleeve is arranged between the two locking pieces; A plurality of positioning swing rods are rotatably provided on the fixed ring, and the positioning swing rods switch between tilted or vertical states as the limiting ring moves to introduce or position the support bars; A cavity for communicating with the rubber ring is opened on the tail end of the positioning rocker, and in the tilted state, the rubber ring is staggered from the cavity and communicated with the outside.

2. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: The sealing ring assembly is provided with a circumferential array of fixed plug rods for clamping the terminal.

3. The composite insulation outdoor intelligent AC arrester according to claim 2, characterized in that: The top end of the fixed plug rod extends into the wiring terminal, and the fixed plug rod is communicated with the expansion bag to transport the overflow gas on the adhesive surface of the terminal seat.

4. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: The rubber ring is communicated with the expansion bag.

5. The composite insulation outdoor intelligent AC lightning arrester according to claim 1, characterized in that: The expansion bag has an opening communicating with the outside, and the limiting ring has a low position for blocking the opening during its movable stroke.

6. The composite insulation outdoor intelligent AC lightning arrester according to claim 1, characterized in that: An embedding portion for embedding into the fixing ring is fixedly provided on the limiting ring, and the cross section of the embedding portion is wedge-shaped.

7. The composite insulation outdoor intelligent AC lightning arrester according to claim 1, characterized in that: The end of the locking piece extends out of the sealing ring assembly, and a lead wire for grounding is fixedly provided on the locking piece.

8. The composite insulation outdoor intelligent AC lightning arrester according to claim 1, characterized in that: The terminal seat is provided with a ring groove corresponding to the rubber ring.

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