lightning arrester

Abstract

The present invention discloses a lightning arrester, comprising 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 stays connecting the two end caps and arranged around the outer periphery of the varistors, and an insulating shell sleeved outside the limit stays, and further comprising: a locking mechanism for driving the two end caps to move toward each other in cooperation with the limit stays, a non-return mechanism for cooperating with the locking mechanism and the insulating shell to limit the action of the locking mechanism on the end caps, and a sealing fixing mechanism for detachably sealingly mounting the end caps at both ends of the insulating shell. The present invention has the following advantages and effects: the present invention has better practicality, longer service life, and is easy to recycle.

Description

Technical Field

[0001] The invention relates to an electrical device, in particular to a lightning arrester. Background Art

[0002] Lightning arresters are mainly used in power systems to protect electrical equipment from the hazards of high transient overvoltages during lightning strikes, and to limit the follow-on time, and often the follow-on amplitude. When lightning overvoltages invade the power system along overhead lines or other paths, they may cause damage to electrical equipment such as cables. Therefore, installing lightning arresters in cable lines can effectively reduce the impact of lightning overvoltages on cables, protect the insulation layer of cables from breakdown, and thus ensure the safe and stable operation of the power system.

[0003] The existing arrester includes a core shaft and an insulating shell wrapped around the outer periphery of the core shaft. The insulating shell and the core shaft are integrally formed by injection molding, which results in the insulating shell and the core shaft being fixed by adhesion. Since this adhesive fixation method has many adhesive surfaces, it is extremely difficult to separate the insulating shell and the core shaft, which makes it impossible to recycle the core shaft in the old arrester, resulting in a huge waste of resources.

[0004] In addition, the existing core shaft uses a simple threaded fastening structure between the two end caps to achieve the locking between the varistors, and the threaded fastening structure is very easy to loosen when subjected to continuous vibration; and due to the influence of the insulating shell material and the assembly structure, the insulating shell cannot play a good axial fixing role on the core shaft. As a result, after the threaded fastening structure is loosened, a small amount of vibration gap will be generated between the varistors when they are vibrated, which will affect the transmission of voltage, causing burns at the gap, and ultimately affecting the service life of the arrester. Summary of the invention

[0005] The object of the present invention is to provide a lightning arrester which has better practicability, longer service life and is easy to recycle.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a lightning arrester, comprising 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 comprising: a locking mechanism cooperating with the limit struts to drive the two end caps to move toward each other, a non-return mechanism cooperating with the locking mechanism and the insulating shell to limit the action of the locking mechanism on the end caps, and sealing fixing mechanisms provided at both ends of the insulating shell that are detachably sealed with the end caps.

[0007] By adopting the above technical solution, a plurality of varistors are stacked and placed between the two end caps, and then the two end caps are connected by a limit stay and arranged around the outer periphery of the varistors. The two end caps are driven to move toward each other by a locking mechanism, thereby realizing the locking between adjacent varistors. Then, an insulating shell is mounted on the outer periphery of the limit stay, and the action of the locking mechanism is limited by a non-return mechanism, thereby constituting a non-return for the locking mechanism to prevent the locking mechanism from loosening. Finally, the two ends of the insulating shell are sealed and fixed by a sealing and fixing mechanism, and the production and assembly operation of the arrester can be completed. When the arrester is to be recycled, the sealing and fixing mechanism can be removed to separate the mandrel from the insulating shell, thereby realizing the recycling of the mandrel. The above-mentioned structure makes the arrester more practical, has a longer service life, and is easy to recycle. Moreover, this setting structure can achieve comprehensive and tight contact between the end cap and the varistor, retaining the contact area between the end cap and the varistor to the greatest extent, so that the voltage can be transmitted quickly and dispersedly, reducing overload damage caused by voltage concentration, thereby improving the quality and reliability of the lightning arrester.

[0008] It is further configured as follows: the outer peripheral walls of the two end caps are provided with docking grooves for the limiting struts to be embedded in the positions corresponding to each limiting strut, and the two end caps are respectively an upper end cap and a lower end cap, and the locking mechanism includes a plurality of abutting grooves arranged on the upper end cap and corresponding to and communicating with the docking grooves on the upper end cap, a abutting slider slidably arranged in each abutting groove and reciprocatingly moving between the two end caps and abutting against the limiting struts, a locking ring mounted on the upper end cap, and a reversing locking component formed between the locking ring and the upper end cap for driving the abutting slider to move opposite to the rheostat and abut against the limiting struts, and the locking ring restricts the limiting struts from leaving the docking grooves.

[0009] By adopting the above technical solution, the rotating locking ring controls the movement of the locking ring opposite to the rheostat under the action of the reversing locking member, and then drives the pressing slider to move opposite to the rheostat in the pressing slide groove and press the limit stay, and the reverse force generated by pressing the limit stay is used to press the two end caps, so as to achieve the locking purpose between adjacent rheostats. And the driven locking ring can limit the limit stay from leaving the docking groove while driving the pressing slider to move, so as to limit the horizontal stability of the limit stay, and further improve the stability of the core shaft installation structure, so that the locking ring has dual functions and better practicality.

[0010] It is further configured that: the clamping slide groove along the movement path of the opposite rheostat includes, in sequence, an embedding position for the clamping slider to be placed and not protruding from the outer peripheral wall of the upper end cap, and an inclined driving path for the clamping slider to move and gradually protruding from the outer peripheral wall of the upper end cap; an upper alignment slope connected to the inclined driving path is formed at the bottom of the docking groove; an upper matching slope matching the upper alignment slope is formed corresponding to the position of the limit support bar; an elastic part driving the clamping slider to move from the embedding position toward the inclined driving path is provided in the upper end cap; a lower alignment component is provided between the docking groove of the lower end cap and the limiting support bar.

[0011] By adopting the above technical solution, the abutting slider is moved to the embedded position, so that the existing abutting slider does not protrude from the outer peripheral wall of the upper end cap, thereby making it easier to install the locking ring and avoiding structural interference with the installation of the locking ring. After the locking ring is installed, the force acting on the abutting slider is released, so that the abutting slider moves from the embedded position to the inclined driving path under the action of the elastic member, and the abutting slider gradually protrudes from the outer peripheral wall of the upper end cap while moving toward the limiting stay, so that the locking ring can drive the abutting slider to move toward the limiting stay. The moving limit stays expand outward toward the outer wall of the upper end cap under the action of the upper alignment slope and the upper matching slope, and form an extrusion lock with the moving locking ring, and then cooperate with the lower alignment assembly to limit the installation position of the limit stays, so as to achieve precise installation of each limit stay and compensate for the different assembly tolerances formed by the installation of each limit stay; so that a uniform and equidistant installation gap can be formed between each limit stay and the resistor, which is more convenient for the sparks generated by power overload to be evenly released outward, thereby improving the performance of the lightning arrester.

[0012] It is further configured as follows: the inner ring of the locking ring is adapted to the outer peripheral wall of the upper end cap and is rotationally matched therewith, the lower alignment component includes a lower alignment slope arranged at the bottom of the docking groove, extending toward one side of the variable resistor and gradually inclined outward, and a lower matching slope arranged on the limiting support bar corresponding to the position of the lower alignment slope and matching the lower alignment slope, and a chemical rope is wound and fixed at a position close to the lower end cap on the outer periphery of the limiting support bar.

[0013] By adopting the above technical solution, this setting structure enables the upper end cap to effectively limit the locking ring, so as to improve the structural stability of the locking ring when it squeezes and locks the limit stay, thereby further improving the stability of the assembly. And this setting structure can minimize the volume increased by the locking ring to ensure the small and compact size of the lightning arrester. The installation positions of the limit stay and the lower end cap are aligned by the cooperation of the lower alignment bevel and the lower matching bevel, thereby ensuring the installation accuracy of the limit stay. And the limit stay and the lower end cap are further fixed by the provided reinforcement rope, thereby improving the stability of the installation.

[0014] It is further configured as follows: the reversing locking component includes a reversing protrusion fixedly arranged on the upper end cap and a reversing guide block rotating with the locking ring and abutting against the reversing protrusion, the reversing protrusion is connected to the upper end cap at one end along the rotation direction of the locking ring, and the other end is gradually protruded along the side of the opposite resistor, and the reversing protrusion and the reversing guide block are both distributed in multiple groups around the outer peripheral wall of the upper end cap.

[0015] By adopting the above technical solution, the locking ring drives the reversing guide block to move along the reversing protrusion, and the reversing protrusion abuts against different positions of the reversing guide block to drive the locking ring to move in opposite directions, thereby providing a clamping force to the clamping slider.

[0016] It is further configured as follows: the anti-return mechanism includes a plurality of lower anti-return slots arranged on the outer peripheral wall of the locking ring, a plurality of upper anti-return slots arranged on the outer peripheral wall of the upper end cap, and a anti-return pin for inserting into the lower anti-return slots and the upper anti-return slots, one end of the upper anti-return slot opposite to the lower anti-return slot is communicated with the outside world, and the insulating shell limits the anti-return pin from detaching from the upper anti-return slot and the lower anti-return slot.

[0017] By adopting the above technical solution, the locking ring is rotated to adjust the locking mechanism to a suitable locking position, and then the check pin is inserted into the lower check slot and the upper check slot in turn to limit the check rotation of the locking ring. Then, the insulating shell is put on to limit the check pin from being separated from the lower check slot and the upper check slot, thereby achieving the purpose of checking the locking mechanism.

[0018] It is further configured as follows: the sealing and fixing mechanism includes an upper sealing and fixing component and a lower sealing and fixing component, the upper sealing and fixing component includes an upper sealing cover covered on the upper end cap, an upper sealing ring integrally connected to the insulating shell and extending between the upper sealing cover and the upper end cap, and an upper fastener driving the upper sealing cover to press and seal the upper sealing ring.

[0019] By adopting the above technical solution, the insulating shell is mounted on the core shaft along the direction from the upper end cap to the lower end cap, so that the upper sealing ring can be located above the top of the upper end cap, and then the upper sealing cover is mounted on the upper end cap. Finally, the upper fastener is locked to drive the upper sealing cover to press the upper sealing ring to achieve sealing, thereby realizing a detachable seal.

[0020] It is further configured as follows: the lower sealing fixing component includes a lower sealing groove formed on the insulating shell and having an opening, a lower sealing cover arranged on the lower end cap and sealedly inserted into the lower sealing groove, and a lower fastener driving the lower sealing cover to be inserted into the lower sealing groove, and the opening of the lower sealing groove is arranged toward one side of the lower end cap.

[0021] By adopting the above technical solution, the lower fastener drives the lower cover to be inserted into the lower sealing groove, thereby forming a seal between the lower end of the insulating shell and the lower end cap, and by setting the opening direction of the lower sealing groove to face the side of the lower end cap, the direction of the assembly gap is changed to prevent rainwater from penetrating inward through the assembly gap, thereby achieving a better sealing effect.

[0022] It is further configured as follows: a plurality of sealing rings are provided between the insulating shell and the lower cover.

[0023] By adopting the above technical solution, multiple sealing rings are provided to achieve multi-pass sealing, thereby further improving the sealing performance.

[0024] In summary, the present invention has the following beneficial effects: the present invention has better practicality, longer service life and is easy to recycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment;

[0026] Figure 2 is a cross-sectional view of an embodiment;

[0027] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0028] Figure 4 for Figure 2 Enlarged view of middle part B;

[0029] Figure 5 It is a partial structural schematic diagram of an embodiment;

[0030] Figure 6 for Figure 5 Schematic diagram of the local structure in;

[0031] Figure 7 It is a partial exploded view of the embodiment.

[0032] In the figure: 1, rheostat; 2, limit stay; 3, insulating shell; 4, locking mechanism; 41, pressing slide groove; 411, embedded position; 412, inclined driving path; 42, pressing slide block; 43, locking ring; 44, reversing protrusion; 45, reversing guide block; 5, non-return mechanism; 51, lower non-return slot; 52, upper non-return slot; 53, non-return pin; 6, upper sealing fixing member; 61, upper cover ; 62. Upper sealing ring; 63. Upper fastener; 7. Lower sealing fixing member; 71. Lower sealing groove; 72. Lower sealing cover; 73. Lower fastener; 8. Docking groove; 9. Upper end cap; 10. Lower end cap; 11. Upper alignment slope; 12. Upper matching slope; 13. Elastic member; 14. Lower alignment component; 141. Lower alignment slope; 142. Lower matching slope; 15. Sealing ring; 16. Reinforcement rope. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] refer to Figures 1 to 7 , a lightning arrester, comprising two end caps, a plurality of varistors 1 arranged between the two end caps and arranged in a direction from one end cap to the other end cap, a plurality of limit stays 2 connecting the two end caps and arranged around the outer periphery of the varistor 1, and an insulating shell 3 sleeved on the limit stays 2. It also includes: a locking mechanism 4 for driving the two end caps to move toward each other in cooperation with the limit stays 2, a non-return mechanism 5 for cooperating with the locking mechanism 4 and the insulating shell 3 to limit the action of the locking mechanism 4 on the end caps, and a sealing fixing mechanism for detachably sealingly mounting with the end caps at both ends of the insulating shell 3. The varistor 1 is a metal oxide varistor disc, and the limit stays 2 are glass fiber strips.

[0035] The outer peripheral walls of the two end caps are provided with a butt joint groove 8 for the butt joint stay 2 to be inserted, corresponding to the position of each butt joint stay 2, and the two end caps are respectively an upper end cap 9 and a lower end cap 10. The locking mechanism 4 includes a plurality of abutting slide grooves 41 provided on the upper end cap 9 and corresponding to and communicating with the butt joint grooves 8 on the upper end cap 9, a butt joint slider 42 slidably arranged in each butt joint slide groove 41 and reciprocatingly moving between the upper end cap 9 and the lower end cap 10 and moving in opposite directions from the variable resistor 1 to butt against the butt joint stay 2, a locking ring 43 sleeved on the upper end cap 9, and a reversing locking member formed between the locking ring 43 and the upper end cap 9 for driving the butt joint slider 42 to move in opposite directions from the variable resistor 1 and butt against the butt joint stay 2, and the locking ring 43 restricts the butt joint stay 2 from leaving the butt joint groove 8.

[0036] The pressing slide groove 41 includes, along the movement path of the opposite variable resistor 1, an embedding position 411 for the pressing slider 42 to be placed and not protruding from the outer peripheral wall of the upper end cap 9, and an inclined driving path 412 for the pressing slider 42 to move and gradually protrude from the outer peripheral wall of the upper end cap 9. An upper alignment slope 11 connected to the inclined driving path 412 is formed at the bottom of the docking groove 8 of the upper end cap 9, and an upper matching slope 12 matching with the upper alignment slope 11 is formed at the position corresponding to the upper alignment slope 11 of the limiting support bar 2. An elastic member 13 is provided in the upper end cap 9 to drive the pressing slider 42 to move from the embedding position 411 toward the inclined driving path 412. The elastic member 13 is an elastic rubber block, and a lower alignment component 14 is provided between the docking groove 8 of the lower end cap 10 and the limiting support bar 2.

[0037] The inner ring of the locking ring 43 is adapted to the outer peripheral wall of the upper end cap 9 and is rotationally matched therewith. The lower alignment component 14 includes a lower alignment slope 141 which is provided at the bottom of the docking groove 8 of the lower end cap 10 and extends toward one side of the varistor 1 and is gradually inclined outward, and a lower matching slope 142 which is provided at the position of the limiting stay 2 corresponding to the lower alignment slope 141 and matches the lower alignment slope 141. A reinforcing rope 16 is wound and fixed at a position of the outer periphery of the limiting stay 2 close to the lower end cap 10, and the reinforcing rope 16 is a resin fiber rope.

[0038] The reversing locking member 4 includes a reversing protrusion 44 fixedly arranged on the upper end cap 9 and a reversing guide block 45 integrally arranged on the locking ring 43 and abutting against the reversing protrusion 44. One end of the reversing protrusion 44 along the rotation direction of the locking ring 43 is connected to the upper end cap 9, and the other end is gradually protruded along the side opposite to the varistor 1. Multiple groups of reversing protrusions 44 and reversing guide blocks 45 are arranged around the outer peripheral wall of the upper end cap 9.

[0039] The anti-return mechanism 5 includes a plurality of lower anti-return slots 51 provided on the outer peripheral wall of the locking ring 43, a plurality of upper anti-return slots 52 provided on the outer peripheral wall of the upper end cap 9, and an anti-return pin 53 for inserting into the lower anti-return slots 51 and the upper anti-return slots 52. One end of the upper anti-return slot 52 opposite to the lower anti-return slot 51 is communicated with the outside. The insulating housing 3 restricts the anti-return pin 53 from being separated from the upper anti-return slot 52 and the lower anti-return slot 51.

[0040] The sealing and fixing mechanism includes an upper sealing and fixing member 6 and a lower sealing and fixing member 7. The upper sealing and fixing member 6 includes an upper cover 61 covered on the upper end cap 9, an upper sealing ring 62 integrally connected to the insulating housing 3 and extending between the upper cover 61 and the top of the upper end cap 9, and an upper fastener 63 driving the upper cover 61 to press and seal the upper sealing ring 62. The upper fastener 63 is a bolt that passes through the upper cover 61 and is threadedly connected to the upper end cap 9. The material of the insulating housing 3 is silicone rubber.

[0041] The lower sealing fixing member 7 includes a lower sealing groove 71 formed in the insulating housing 3 and having an opening, a lower cover 72 which is covered on the lower end cap 10 and is sealed and inserted into the lower sealing groove 71, and a lower fastener 73 which drives the lower cover 72 to be inserted into the lower sealing groove 71. The lower fastener 73 is a bolt which passes through the lower cover 72 and is threadedly connected to the lower end cap 10. The opening of the lower sealing groove 71 is arranged toward the side of the lower end cap 10. A plurality of sealing rings 15 are arranged between the insulating housing 3 and the lower cover 72, and the sealing rings 15 are integrally arranged on the insulating housing 3.

[0042] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A lightning arrester, comprising two end caps, a plurality of varistors (1) arranged between the two end caps and arranged in a direction from one end cap to the other end cap, a plurality of limit stays (2) connecting the two end caps and arranged around the outer periphery of the varistors (1), and an insulating shell (3) sleeved on the outer side of the limit stays (2), characterized in that: It also includes: a locking mechanism (4) for cooperating with the limiting strut (2) to drive the two end caps to move toward each other; the end caps are provided with a non-return mechanism (5) for cooperating with the locking mechanism (4) and the insulating shell (3) to limit the action of the locking mechanism (4); both ends of the insulating shell (3) are provided with sealing fixing mechanisms that are detachably sealed and mounted with the end caps; the outer peripheral walls of the two end caps are provided with a docking groove (8) for the limiting strut (2) to be embedded in the position corresponding to each limiting strut (2); the two end caps are respectively an upper end cap (9) and a lower end cap (10); the locking mechanism (4) includes a setting A plurality of abutting slide grooves (41) are provided on the upper end cap (9) and correspond to and communicate with the docking grooves (8) on the upper end cap (9); abutting sliders (42) are slidably arranged in each abutting slide groove (41) and reciprocate between the two end caps and abut against the limit stay (2); a locking ring (43) is mounted on the upper end cap (9); and a reversing locking component is formed between the locking ring (43) and the upper end cap (9) and is used to drive the abutting sliders (42) to move in the opposite direction of the rheostat (1) and abut against the limit stay (2); the locking ring (43) limits the limit stay (2) from leaving the docking grooves (8).

2. The lightning arrester according to claim 1, characterized in that: The abutting slide groove (41) includes, along the movement path of the opposed variable resistor (1), an embedding position (411) for the abutting slider (42) to be placed and not protruding from the outer peripheral wall of the upper end cap (9), and an inclined driving path (412) for the abutting slider (42) to move and gradually protrude from the outer peripheral wall of the upper end cap (9); an upper alignment slope (11) connected to the inclined driving path (412) is formed at the bottom of the docking embedding groove (8); an upper matching slope (12) matching with the upper alignment slope (11) is formed corresponding to the position of the upper alignment slope (11) of the limiting support bar (2); an elastic member (13) for driving the abutting slider (42) to move from the embedding position (411) toward the inclined driving path (412) is provided in the upper end cap (9); a lower alignment component (14) is provided between the docking embedding groove (8) of the lower end cap (10) and the limiting support bar (2).

3. The lightning arrester according to claim 2, characterized in that: The inner ring of the locking ring (43) is adapted to the outer peripheral wall of the upper end cap (9) and is rotatably matched therewith. The lower alignment component (14) includes a lower alignment slope (141) arranged at the bottom of the docking groove (8), extending toward one side of the resistor (1) and gradually tilted outward, and a lower matching slope (142) arranged on the limiting support bar (2) corresponding to the position of the lower alignment slope (141) and matching with the lower alignment slope (141). A chemical rope (16) is wound and fixed on the outer periphery of the limiting support bar (2) close to the lower end cap (10).

4. The arrester according to claim 1, characterized in that: The reversing locking component comprises a reversing protrusion (44) fixedly arranged on the upper end cap (9) and a reversing guide block (45) rotating with the locking ring (43) and abutting against the reversing protrusion (44); one end of the reversing protrusion (44) along the rotation direction of the locking ring (43) is connected to the upper end cap (9), and the other end is gradually protruding along the side of the opposite variable resistor (1); the reversing protrusion (44) and the reversing guide block (45) are both arranged in a plurality of groups around the outer peripheral wall of the upper end cap (9).

5. The arrester according to claim 1, characterized in that: The anti-return mechanism (5) comprises a plurality of lower anti-return slots (51) arranged on the outer peripheral wall of the locking ring (43), a plurality of upper anti-return slots (52) arranged on the outer peripheral wall of the upper end cap (9), and an anti-return pin (53) for inserting into the lower anti-return slots (51) and the upper anti-return slots (52), wherein one end of the upper anti-return slot (52) opposite to the lower anti-return slot (51) is communicated with the outside, and the insulating shell (3) restricts the anti-return pin (53) from being separated from the upper anti-return slot (52) and the lower anti-return slot (51).

6. The lightning arrester according to claim 1, characterized in that: The sealing and fixing mechanism comprises an upper sealing and fixing component (6) and a lower sealing and fixing component (7), wherein the upper sealing and fixing component (6) comprises an upper cover (61) which is covered on an upper end cap (9), an upper sealing ring (62) which is integrally connected to the insulating housing (3) and extends between the upper cover (61) and the upper end cap (9), and an upper fastener (63) which drives the upper cover (61) to press and seal the upper sealing ring (62).

7. The lightning arrester according to claim 6, characterized in that: The lower sealing fixing component (7) comprises a lower sealing groove (71) formed on the insulating housing (3) and having an opening, a lower sealing cover (72) which is arranged on the lower end cap (10) and is sealed and inserted into the lower sealing groove (71), and a lower fastener (73) which drives the lower sealing cover (72) to be inserted into the lower sealing groove (71), and the opening of the lower sealing groove (71) is arranged toward one side of the lower end cap (10).

8. The lightning arrester according to claim 7, characterized in that: A plurality of sealing rings (15) are provided between the insulating shell (3) and the lower cover (72).

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