Composite insulation outdoor intelligent alternating current lightning arrester

Abstract

The invention discloses a composite insulated outdoor intelligent alternating current lightning arrester, which relates to the technical field of lightning arresters, and comprises wiring terminals positioned at the upper end and the lower end of the lightning arrester, and the sealing ring assembly is arranged on the wiring end and coaxially sleeved outside the terminal seat and comprises a limiting ring and a fixing ring which are in threaded fit, and an expansion bag and a rubber ring are respectively arranged on the fixing ring. According to the composite insulation outdoor intelligent alternating current lightning arrester, the fixing ring is tightly attached to the terminal base through limitation of the limiting ring, a gap is prevented from being generated between the terminal base and the wiring terminal, the terminal base and the silicon rubber sleeve are integrally formed in a mold pressing injection molding mode, the gap caused by assembly in the production process is reduced, and the production efficiency is improved. The tearing rope is embedded in the silicone rubber sleeve in the assembling process, the silicone rubber sleeve is divided by pulling the tearing rope when recycling is needed, the requirement for repeated use is met, and the problem that sealing is not tight when sleeving is adopted is solved.

Description

Technical Field

[0001] The 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 overvoltages and operating overvoltages) 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 varistors 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 outer periphery of the varistors, and an insulating shell mounted outside the limit struts, and also including: a locking mechanism cooperating 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 cooperating with the locking mechanism and the insulating shell for limiting the action of the locking mechanism, and sealing fixing mechanisms are provided at both ends of the insulating shell that are 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 bar 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 the lightning strike, making the insulating shell near the end cap more susceptible 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, resulting in 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] In order 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 arranged between the wiring terminals, and also comprising a support bar arranged on the outer wall of the varistor block and a silicone rubber sleeve molded on the outer periphery of the support bar and an intelligent detection module, including a terminal seat glued to the opposite side of the wiring terminal and abutting against the varistor block; A sealing ring assembly is arranged on the terminal and coaxially sleeved outside the terminal seat, 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 radial contraction state, and the fixing ring is respectively provided with an expansion bag and a rubber ring; 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 arrester, and a tearing rope used for cutting the silicone rubber sleeve is arranged between the two locking pieces.

[0008] Preferably, the sealing ring assembly is provided with a circumferential array of fixed plug rods for clamping the wiring terminals.

[0009] Preferably, the top end of the fixing rod extends into the wiring terminal, and the fixing rod is connected to the expansion bag to transport the overflow gas from the adhesive surface of the terminal seat.

[0010] Preferably, a plurality of positioning swing rods are rotatably provided on the fixing ring, and the positioning swing rods switch between inclined or vertical states as the limiting ring moves, so as to introduce or position the support bars.

[0011] Preferably, a cavity for communicating with the 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.

[0012] Preferably, the rubber ring is communicated with the expansion bladder.

[0013] 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.

[0014] 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.

[0015] Preferably, the end of the locking member extends out of the sealing ring assembly, and a lead wire for grounding is fixedly provided on the locking member.

[0016] Preferably, a ring groove corresponding to the rubber ring is formed on the terminal seat.

[0017] In the above technical scheme, a composite insulated outdoor intelligent AC lightning arrester provided by the present invention has the following beneficial effects: the fixing ring is restricted by the limit ring to make it close to the terminal seat, thereby avoiding the generation 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, 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 can be split by pulling the tear rope, which not only meets the demand for reuse, but also avoids the problem of poor sealing when using a set. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 An overall three-dimensional schematic diagram provided for an embodiment of the present invention; Figure 2 A schematic diagram of the cross-sectional structure of a lightning arrester provided in an embodiment of the present invention; Figure 3 A schematic diagram of the positions of the wiring terminal, sealing ring assembly and terminal seat provided in an embodiment of the present invention; Figure 4 A schematic diagram of a cutaway structure of a sealing ring assembly and a terminal block provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a sealing ring assembly provided in an embodiment of the present invention; Figure 6 A schematic cross-sectional view of the sealing ring assembly structure provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a limiting ring, a fixing ring and a positioning swing rod provided in an embodiment of the present invention; Figure 8 A schematic diagram of the positioning swing rod structure provided by an embodiment of the present invention; Fig. 9 A schematic diagram of the locking member and tear rope structure provided in an embodiment of the present invention; Fig.10 The embodiment of the present invention provides Figure 4 A schematic diagram of the enlarged structure in the middle; Fig.11 The embodiment of the present invention provides Figure 6 A magnified schematic diagram of structure B in the middle.

[0020] Description of reference numerals: 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 bag; 161. First channel; 2. Terminal; 3. Silicon 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

[0021] 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.

[0022] 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 variable resistance block 6 arranged between the terminals 2, and also includes a support bar 7 arranged on the outer wall of the variable resistance block 6 and 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, such as Figure 3 As shown, the gap between the top of the sealing ring assembly 1 and the terminal 2 is the adhesive space; The sealing ring assembly 1 is arranged on the terminal 2 and coaxially sleeved outside the terminal seat 8, comprising a threaded limiting ring 11 and a fixing ring 12, wherein the port 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); 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 (as shown) for cutting the silicone rubber sleeve 3 is arranged between the two locking members 5. Fig. 9 as shown).

[0023] 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 resistance block 6 is a zinc oxide valve plate, and the tear rope 52 is made of aramid fiber.

[0024] 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 block 8 is coaxially inserted into the sealing ring assembly 1, and the annular groove 81 opened on the terminal block 8 is clamped with the rubber ring 15, and the top of the terminal block 8 is fully contacted and fixed with the glue in the adhesive space.

[0025] The limiting ring 11 is fixedly provided 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 The limiting ring 11 has a completely disconnected gap, while the fixing ring 12 has an incompletely disconnected blind hole, the lower end of which extends toward 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 in FIG. Figure 6 As shown), 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 seat 8 is fixed, the limiting ring 11 is rotated again, and the limiting ring 11 is rotated and moved downward along the outer screw groove 123. 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 is slowly contracted, and the contracted margin is released through the space of the fracture, so as to prevent the fixing ring 12 from cracking due to internal stress concentration. The fixing ring 12 further fixes the terminal seat 8, and the fixing ring 12 is tightly attached to the terminal seat 8 through the restriction of the limiting ring 11, so as to further achieve sealing.

[0026] 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 grooves 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 grooves 114 is increased. When the outer grooves 114 of the limit ring 11 correspond to the positions of the inner grooves 14, a through groove is formed between the outer grooves 114 and the inner grooves 14, and the spacing of the through grooves gradually decreases from the outside to the inside. Figure 3 As shown, the locking piece 5 is inserted into two through grooves (i.e., the outer groove 114 and the inner groove 14) respectively 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 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.

[0027] Multiple varistor blocks 6 are stacked between two terminal seats 8 to form a nonlinear resistor in series, and then the ends of multiple support bars 7 are placed on the grooves on the side of the terminal seat 8, and the middle varistor block 6 is vertically constrained by the support bars 7. Finally, a mold is put on the periphery of the support bar 7 by an injection molding mechanism (where the mold is located between the opposite sides of the two sealing ring assemblies 1) and a silicone rubber raw material is injected into the mold. After the silicone rubber raw material is cooled and formed, a silicone rubber sleeve 3 with a certain flexibility is formed. The gap between the silicone rubber sleeve 3 and the varistor block 6 can be reduced by injection molding. At this time, the tear rope 52 is located inside the silicone rubber sleeve 3.

[0028] 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 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, and then the support bar 7 and the variable resistor block 6 can be removed as needed for recycling.

[0029] The intelligent detection module can use an infrared detection device or an image detection device to scan the arrester as a whole, transmit it to the screen for real-time feedback, and highlight the high-temperature parts. To facilitate maintenance personnel monitoring, the above electronic components can use an infrared device for valve body flaw detection disclosed in publication number CN105223203B, publication date 2018-04-10, which belongs to a conventional detection module known to those skilled in the art and will not be described in detail here.

[0030] 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 compression 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 split by pulling the tear rope 52, which not only meets the demand for reuse, but also avoids the problem of poor sealing when using a set.

[0031] As an embodiment further provided by the present invention, a fixing plug rod 13 for clamping the terminal 2 is arranged in a circumferential array on the sealing ring assembly 1 .

[0032] Specifically, the fixed rod 13 is fixedly arranged at the upper end of the fixed ring 12, such as Figure 3 As shown, a rectangular groove corresponding to the fixing 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 rod 13 along the rectangular groove. At this time, an adhesive space is enclosed between the inner ring of the fixing ring 12 and the end face of the terminal 2. The fixing of the fixing ring 12 is achieved 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.

[0033] As another embodiment provided by the present invention, the top end of the fixing rod 13 extends into the wiring 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 seat 8.

[0034] Specifically, 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.

[0035] 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 a first channel 161 opened in the fixed ring 12, such as Figure 7As shown. When assembling the sealing ring assembly 1, the top end of the fixed plug rod 13 is embedded in the rectangular groove of the terminal 2, and the bottom end of the fixed plug rod 13 is located below the end face of the terminal 2, that is, the bottom end of the fixed plug rod 13 is located in the adhesive space, and the top end of the fixed plug rod 13 is staggered from the adhesive space, so that the glue enters along the gap between the rectangular groove and the fixed plug rod 13. Due to the tension of the glue itself and the resistance of the narrow gap to the glue, the glue will not reach the top end of the fixed plug rod 13. During the process of plugging the terminal seat 8, the air on the end face of the terminal seat 8 is squeezed into the adhesive space to form bubbles. Since the bubbles are light and are squeezed upward by the terminal seat 8 (the terminal seat 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 plug 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.

[0036] 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 prior art, 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 operations on site; 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, thereby preventing the air in the adhesive space from being released in time and the mechanical stress generated causing the lightning arrester to explode.

[0037] As another embodiment provided by the present invention, a plurality of positioning swing rods 4 are rotatably provided on the fixing ring 12 , and the positioning swing rods 4 switch between the inclined or vertical states as the limiting ring 11 moves, so as to introduce or position the support bar 7 .

[0038] Specifically, a plurality of teeth 45 meshing with the external thread 113 are arranged in a circumferential 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, and when the external thread 113 moves downward, the screw groove presses the teeth 45 downward, so that the teeth 45 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 7As shown, the positioning swing rod 4 in the default state is in the tilted state shown by the dotted line, and the limit ring 11 is at the dotted line position. At this time, multiple positioning swing rods 4 form a bucket-shaped guide space that gradually narrows from bottom to top, allowing the end of the support bar 7 to enter through the guide space. Then, the limit ring 11 rotates and moves downward to the solid line position, driving the positioning swing rod 4 to swing toward the variable resistance block 6. The positioning swing rod 4 swings from the outside to the inside and clamps the fixed support bar 7, which is different from the method of fixing the support bar 7 with a heat-curing tape in the prior art, avoiding the problem of poor heat dissipation caused by too many turns of the heat-curing tape wrapped around the support bar 7.

[0039] As another embodiment provided by the present invention, a cavity 42 for communicating with the rubber ring 15 is provided 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 communicated with the outside.

[0040] Specifically, a fixing rod 41 (such as Figure 4 As shown), the first end of the positioning swing rod 4 is a rotating disk 44, and the rotating disk 44 is separated by a fourth channel 43 through an arc plate, wherein the fourth channel 43 is connected to the cavity 42 (as shown Figure 8 As shown, the rubber ring 15 is fixedly provided with a second channel 151 (as shown Figure 7 as shown).

[0041] Combination Figure 7 and Figure 8 In the default state, the positioning swing rod 4 is in the tilted state shown by the dotted line, the fourth channel 43 is staggered with the port of the second channel 151, and the port of the second channel 151 points to the open space between the rotating disk 44 and the arc plate, which is open to the outside and not closed. At this time, when the terminal seat 8 is inserted into the fixing ring 12, the ring groove 81 squeezes the rubber ring 15, so that the air in the rubber ring 15 will directly pass through the second channel 151 to the outside, playing a role of adaptive adjustment.

[0042] 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 in the solid line part.

[0043] Since the fixing rod 41 will be inserted into the support bar 7 as the positioning swing rod 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 resistance block 6 closer. In the prior art, the variable resistance block 6 generates heat when the high-voltage current passes through the arrester during operation, but 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, so that there is a gap between the inner wall of the silicone rubber sleeve 3 and the support bar 7. Moisture enters the wiring terminals 2 and the terminal seat 8 at the upper and lower ends through the gap, which is easy to cause a high-voltage breakdown accident, thereby causing the arrester to malfunction. The heat in the present invention 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 to expand the rubber ring 15, preventing moisture from entering the wiring terminals 2 and the terminal seat 8 along the gap of the inner wall of the silicone rubber sleeve 3.

[0044] 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.

[0045] Specifically, the position of the opening 162 is as follows: Fig.10 and Fig.11 As shown, it is located at the bottom of the expansion bag 16 facing the outside. The side of the limiting ring 11 in the default state is located above the opening 162, and does not block the opening 162, so that the air in the expansion bag 16 enters 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 coordination with the annular groove 81.

[0046] Then, the limiting ring 11 is rotated downward to block the opening 162, so that the expansion bag 16 and the rubber ring 15 are both 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 toward the expansion bag 16 along the first channel 161, and part of it enters the rubber ring 15 through the third channel 152, separating 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 sealing failure.

[0047] Moreover, during long-term use, the heat release of the variable resistance 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 resistance 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 resistance block 6 causes the air in the cavity 42 to slowly expand, and the space in the rubber ring 15 is not enough to accommodate the expanded air. The air will enter the expansion bag 16, and the bulging of the expansion bag 16 will intuitively remind the relevant maintenance personnel.

[0048] 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.

[0049] 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 thread 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 can prevent 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 moving parts from being attached to the injection liquid during the injection molding process.

[0050] 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 wire 51 for grounding is fixedly provided on the locking member 5 .

[0051] 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 covers the end surface of the locking member 5. Once the high voltage current forms a surface flashover along the surface of the insulating material, the conductive path formed by the water film will be directly grounded along the lead 51.

[0052] Working principle: First, install the sealing ring assembly 1 detachably on the facing surface of the terminal 2, and insert the top of the fixed plug rod 13 into the rectangular groove of the terminal 2. At this time, the bottom end of the fixed plug rod 13 is located below the end surface of the terminal 2, that is, the bottom end of the fixed plug rod 13 is located in the adhesive space, and the top end of the fixed plug rod 13 is staggered from the adhesive space. Subsequently, glue is applied in the adhesive space surrounded by the sealing ring assembly 1 of the terminal 2, 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 end of the terminal seat 8 is fully contacted and fixed with the glue in the adhesive space.

[0053] After the terminal seat 8 is fixed, the limiting ring 11 is rotated again, and the limiting ring 11 is rotated and moved downward along the external screw groove 123. At the same time, the gradually enlarged external screw groove 123 is squeezed through the external thread 113, and the embedded part 111 is inserted into the recessed part 121, which squeezes the middle part of the inner wall of the fixing ring 12, which can prevent the limiting ring 11 from detaching, improve the fixing effect on the terminal seat 8, and at the same time, the limiting ring 11 can reach the lowest point, completely covering the external screw groove 123 on the fixing ring 12 and the head end of the positioning swing rod 4. The limiting ring 11 rotates and moves downward to the solid line position, driving the positioning swing rod 4 to swing toward the direction of the variable resistance block 6, and the positioning swing rod 4 swings from the outside to the inside and clamps the fixed support bar 7.

[0054] When the outer slot 114 of the limiting ring 11 corresponds to the inner slot 14, a through slot is formed between the outer slot 114 and the inner slot 14. Figure 3 As shown, the locking member 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 member 5, and the locking member 5 is clamped and fixed by the through grooves, and the tear rope 52 between the two locking members 5 is tightly attached to the outer wall of the variable resistance block 6.

[0055] Multiple varistor blocks 6 are stacked between two terminal seats 8 to form a nonlinear resistor in series, and then the ends of multiple support bars 7 are placed on the grooves on the side of the terminal seat 8, and the middle varistor block 6 is vertically constrained by the support bars 7. Finally, a mold is put on the periphery of the support bar 7 by an injection molding mechanism (where the mold is located between the opposite sides of the two sealing ring assemblies 1) and a silicone rubber raw material is injected into the mold. After the silicone rubber raw material is cooled and formed, a silicone rubber sleeve 3 with a certain flexibility is formed. The gap between the silicone rubber sleeve 3 and the varistor block 6 can be reduced by injection molding. At this time, the tear rope 52 is located inside the silicone rubber sleeve 3.

[0056] 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 scheme 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 plug 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 causing 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.

[0057] When replacement is needed, 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 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, and then the support bar 7 and the variable resistor block 6 can be removed as needed for recycling.

[0058] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A composite insulated outdoor intelligent AC lightning arrester, comprising wiring terminals (2) located at the upper and lower ends of the lightning arrester and a variable resistance block (6) arranged between the wiring terminals (2), and also comprising a support bar (7) arranged on the outer wall of the variable resistance block (6) and a silicone rubber sleeve (3) molded on the outer periphery of the support bar (7) and an intelligent detection module, characterized in that: It comprises a terminal seat (8) glued to the opposite side of the wiring terminal (2) and abutting against the variable resistance block (6); A sealing ring assembly (1) is arranged on the wiring terminal (2) and coaxially sleeved outside the terminal seat (8), comprising a threaded limiting ring (11) and a fixing ring (12), wherein the port of the fixing ring (12) is in a radially contracted state due to being squeezed by the limiting ring (11), and the fixing ring (12) is respectively provided with an expansion bag (16) and a rubber ring (15); A locking member (5) for limiting the position of a limiting ring (11) and a fixing ring (12) is arranged relatively at the upper and lower ends of the arrester, and a tearing rope (52) for cutting the silicone rubber sleeve (3) is arranged between the two locking members (5).

2. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: The sealing ring assembly (1) is provided with a fixed insertion rod (13) in a circumferential array on the upper side for clamping the wiring terminal (2).

3. The composite insulation outdoor intelligent AC arrester according to claim 2 is characterized in that: The top end of the fixed plug rod (13) extends into the wiring terminal (2), and the fixed plug rod (13) is connected to the expansion bag (16) to transport the overflow gas from the adhesive surface of the terminal seat (8).

4. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: A plurality of positioning swing rods (4) are rotatably arranged on the fixing ring (12), and the positioning swing rods (4) switch between inclined or vertical states as the limiting ring (11) moves, so as to introduce or position the support bar (7).

5. The composite insulation outdoor intelligent AC arrester according to claim 4, characterized in that: A cavity (42) for communicating with the rubber ring (15) is provided on the tail end of the positioning rocker rod (4), and in a tilted state, the rubber ring (15) and the cavity (42) are offset and communicated with the outside.

6. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: The rubber ring (15) is in communication with the expansion bag (16).

7. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: The expansion bag (16) has an opening (162) communicating with the outside, and the limiting ring (11) has a low position in its movable stroke that blocks the opening (162).

8. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: 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.

9. The composite insulation outdoor intelligent AC lightning arrester according to claim 1, characterized in that: The end of the locking member (5) extends out of the sealing ring assembly (1), and a lead wire (51) for grounding is fixedly provided on the locking member (5).

10. The composite insulation outdoor intelligent AC arrester according to claim 1, characterized in that: The terminal seat (8) is provided with an annular groove (81) corresponding to the rubber ring (15).

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