Parallel lightning arrester convenient to disassemble and assemble

Abstract

The utility model discloses a parallel lightning arrester convenient to disassemble and assemble, which comprises a zinc oxide lightning arrester, an upper mounting plate, a lower mounting plate, a pressing mechanism, a positioning gasket, an internal thread hand wheel and a composite insulator, the lower mounting plate is horizontally mounted at the lower part of the composite insulator, and a plurality of U-shaped holes are formed in the edge of the lower mounting plate; the upper mounting plate is horizontally mounted at the upper part of the composite insulator; a plurality of through holes are formed in the upper mounting plate; the upper end and the lower end of the zinc oxide arrester are respectively provided with an upper-end fitting and a lower-end fitting; the lower-end fitting passes through the U-shaped hole and is fixed on the lower mounting plate through an internal thread hand wheel after being sleeved with a positioning gasket; the pressing mechanism is fixedly connected above the through hole of the upper mounting plate, and the upper-end hardware fitting penetrates through the through hole and is pressed by the pressing mechanism at the same time; according to the utility model, the overhauling, dismounting and mounting processes of the parallel zinc oxide lightning arrester group are simplified, the requirement of an AC / DC system on high energy absorption of the lightning arrester can be met, the difficulty of overhauling the lightning arrester is reduced, and the practicability is strong.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning arresters, in particular to a parallel lightning arrester which is easy to disassemble and assemble. Background Art

[0002] A lightning arrester is an electrical device used to protect electrical equipment from high transient overvoltage hazards and limit the follow-through time and often the follow-through amplitude. This term includes any external gap necessary for the normal function of the device during operation and installation, regardless of whether it is a component of the whole. Lightning arresters are usually connected between the grid conductor and the ground wire, but sometimes they are also connected next to the electrical winding or between the wires. Lightning arresters are sometimes also called overvoltage protectors and surge dividers. Lightning arresters are another important device often used to prevent communication cables from being damaged by lightning.

[0003] Zinc oxide arrester is a new type of arrester developed in the 1970s. It is mainly composed of zinc oxide varistor. Each varistor has a certain switching voltage (called varistor voltage) when it is made. Under normal working voltage (i.e. less than varistor voltage), the varistor value is very large, which is equivalent to insulation state, but under the action of impulse voltage (greater than varistor voltage), the varistor is broken down at a low value, which is equivalent to short circuit state. However, after the varistor is struck, it can restore the insulation state; when the voltage higher than the varistor voltage is removed, it restores the high resistance state. Therefore, if zinc oxide arrester is installed on the power line, when lightning strikes, the high voltage of the lightning wave breaks down the varistor, and the lightning current flows into the earth through the varistor, which can control the voltage on the power line within a safe range, thereby protecting the safety of electrical equipment.

[0004] In order to meet the requirements of high energy absorption of lightning arresters in AC and DC systems and reduce the insulation level of protected equipment, multi-column parallel structure lightning arresters came into being. Up to now, multi-column parallel lightning arresters, such as series compensated voltage limiters, DC neutral bus lightning arresters, high-performance low residual voltage lightning arresters, etc., have been widely used in domestic and foreign power systems.

[0005] Utility model patent CN204012614U discloses a large-capacity drop-out arrester, including an upper bracket, a lower bracket, a zinc oxide arrester with a thermal release device, an ordinary zinc oxide arrester and a pillar insulator, wherein the upper bracket and the lower bracket are both Y-shaped, and the zinc oxide arrester with a thermal release device, the ordinary zinc oxide arrester and the pillar insulator are connected in parallel and are respectively fixed between the upper bracket and the lower bracket.

[0006] However, in the patented technical solution and the conventionally used multi-column parallel structure lightning arresters, the lightning arresters are fixed with bolts, nuts and other parts. When installing, repairing and replacing lightning arresters, operators are required to carry more manual or electric tools and work at high altitudes far from the ground. The cumbersome operation increases the difficulty of the maintenance work, and also increases the safety hazards such as tools falling and injuring people.

[0007] Therefore, it is necessary to develop a parallel lightning arrester that is easy to disassemble and assemble in view of the above defects. Utility Model Content

[0008] The purpose of the utility model is to provide a parallel lightning arrester which is easy to disassemble and assemble. A plurality of groups of zinc oxide lightning arresters are assembled into a group through an upper clamping mechanism, an upper mounting plate, a lower mounting plate and an internally threaded handwheel. Compared with a single zinc oxide lightning arrester, the ability to release overvoltage current is increased, and the difficulty of maintenance and replacement of conventional multi-column parallel lightning arresters is also simplified.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0010] The utility model discloses a parallel lightning arrester which is easy to disassemble and assemble, comprising a zinc oxide lightning arrester, an upper mounting plate, a lower mounting plate, a clamping mechanism, a positioning gasket, an internal thread hand wheel and a composite insulator, wherein the composite insulator is vertically arranged in a middle position, the zinc oxide lightning arrester is vertically arranged around the composite insulator and comprises an upper hardware fitting and a lower hardware fitting, the lower mounting plate is horizontally mounted on the lower part of the composite insulator, a plurality of U-shaped holes are provided on the edge of the lower mounting plate, the upper mounting plate is horizontally mounted on the upper part of the composite insulator, a plurality of through holes are provided on the upper mounting plate; the lower hardware fitting passes through the U-shaped hole and is fixed to the lower mounting plate by an internal thread hand wheel after being fitted with the positioning gasket; the clamping mechanism is fixedly connected above the through hole of the upper mounting plate, and the upper hardware fitting passes through the through hole and is clamped by the clamping mechanism at the same time.

[0011] Furthermore, a circular groove is provided on the bottom surface of the lower mounting plate at the position of the U-shaped hole, and the position of the circular groove corresponds to the axis of the zinc oxide lightning arrester; the diameter of the circular groove matches the outer circle of the positioning gasket.

[0012] Furthermore, the upper end of the upper end fitting is a spherical head structure, the lower connecting column of the lower end fitting is a screw structure, and the internal thread handwheel is threadedly connected to the screw.

[0013] Furthermore, the clamping mechanism includes a shell, an electrode pressing block and a pressure spring. The inner cavity of the shell is a cylindrical hole with the hole opening facing downward. The electrode pressing block is a cylindrical part with a hemispherical hole groove at the bottom. The electrode pressing block coaxially slides in the inner cavity of the cylindrical hole of the shell and can slide up and down. The pressure spring is coaxially sleeved in the inner cavity of the shell and elastically presses the electrode pressing block from above; the spherical head of the upper hardware falls into the hemispherical hole groove.

[0014] Furthermore, the utility model provides a parallel lightning arrester that is easy to disassemble and assemble, and also includes a mounting bracket for installation and a continuous terminal block, wherein the mounting bracket is fixedly connected to the bottom surface of the lower mounting plate, and the terminal block is fixedly connected to the housing.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are:

[0016] The utility model discloses a zinc oxide lightning arrester in a parallel lightning arrester which is easy to disassemble and assemble, adopts a new installation method, with the lower end being threaded and the upper end being spring-loaded, and a cage-type parallel structure consisting of a composite insulator, upper and lower mounting plates and the zinc oxide lightning arrester, which can effectively improve the ability to release overvoltage current, simplify the difficulty of maintenance and replacement operations, and significantly improve the safety of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the parallel lightning arrester which is easy to disassemble and assemble according to the utility model;

[0019] Figure 2 It is a top view of the three-dimensional structure of the parallel lightning arrester which is easy to disassemble and assemble according to the utility model;

[0020] Figure 3 It is a schematic cross-sectional structure diagram of the parallel type lightning arrester which is easy to disassemble and assemble according to the utility model;

[0021] Figure 4 It is a cross-sectional structural schematic diagram of the clamping mechanism of the utility model;

[0022] Figure 5 It is a cross-sectional schematic diagram of the installation structure of the positioning gasket and the internal thread handwheel of the utility model;

[0023] Figure 6 It is a schematic diagram of the top structure of the lower mounting plate of the utility model.

[0024] Explanation of the reference numerals in the accompanying drawings: 1. zinc oxide arrester; 101. upper end fitting; 102. lower end fitting; 2. upper mounting plate; 3. lower mounting plate; 4. clamping mechanism; 401. housing; 402. electrode pressing block; 403. pressure spring; 5. positioning gasket; 6. internal threaded handwheel; 7. mounting bracket; 8. terminal block; 9. composite insulator. DETAILED DESCRIPTION

[0025] The core of the utility model is to provide a parallel lightning arrester that is easy to disassemble and assemble. Multiple groups of zinc oxide lightning arresters are assembled into a group through an upper clamping mechanism, an upper mounting plate, a lower mounting plate and an internally threaded handwheel. Compared with a single zinc oxide lightning arrester, the ability to release overvoltage current is increased, and the difficulty of maintenance and replacement of conventional multi-column parallel lightning arresters is also simplified.

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In a specific embodiment of the present invention, Figure 1 and Figure 3 As shown, the utility model is a parallel lightning arrester that is easy to disassemble and assemble, including a vertical composite insulator 9 in the middle position and multiple vertical zinc oxide lightning arresters 1 around it, and also includes an upper mounting plate 2, a lower mounting plate 3, a clamping mechanism 4, a positioning gasket 5 and an internal threaded handwheel 6. The lower mounting plate 3 is horizontally mounted on the lower part of the composite insulator 9, and the edge of the lower mounting plate 3 is provided with multiple U-shaped holes. The upper mounting plate 2 is horizontally mounted on the upper part of the composite insulator 9, and the upper mounting plate 2 is provided with multiple through holes; the upper and lower ends of the zinc oxide lightning arrester 1 are respectively provided with an upper end hardware 101 and a lower end hardware 102, the lower end hardware 102 passes through the U-shaped hole and is fixed to the lower mounting plate 3 by the internal threaded handwheel 6 after the positioning gasket 5 is installed; the clamping mechanism 4 is installed above the through hole of the upper mounting plate 2 by bolts, and the upper end hardware 101 passes through the through hole and is clamped by the clamping mechanism 4 at the same time.

[0029] Specifically, the composite insulator 9 in the middle position and the upper mounting plate 2 and the lower mounting plate 3 installed on the upper and lower parts thereof form an installation frame, and multiple zinc oxide lightning arresters 1 are installed inside this frame. The lower end of the zinc oxide lightning arrester 1 is fixed by the internal threaded handwheel 6 and the lower mounting plate 3, and the upper end of the zinc oxide lightning arrester 1 is clamped by the clamping mechanism 4 on the upper side of the upper mounting plate 2 to form an integral fixation.

[0030] In a specific embodiment of the present invention, Figure 3 and Figure 5 As shown, a circular groove is provided on the bottom surface of the lower mounting plate 3 at the position of the U-shaped hole, and the position of the circular groove corresponds to the axis of the zinc oxide arrester 1 ; the diameter of the circular groove matches the outer circle of the positioning gasket 5 .

[0031] Specifically, when the zinc oxide lightning arrester 1 is installed and disassembled, it is tilted at a certain small angle, and the lower end hardware 102 can pass through the U-shaped hole on the lower mounting plate 3 to enable the zinc oxide lightning arrester 1 to be detached from the lower mounting plate 3 without disassembling the lower mounting plate 3 and the composite insulator 9.

[0032] Furthermore, the circular groove on the lower side of the lower mounting plate 3 and the positioning gasket 5 are of the same size. After the lower end fitting 102 of the zinc oxide lightning arrester 1 is coaxially mounted on the positioning gasket 5, the internal threaded handwheel 6 and the lower end fitting 102 are threadedly connected and rotated to tighten the positioning gasket 5, and the positioning gasket 5 is pressed into the circular groove on the lower side of the lower mounting plate 3. This can prevent the threaded connection of the internal threaded handwheel 6 from loosening, and can also prevent the lower end fitting 102 of the zinc oxide lightning arrester 1 from moving when in a tightened state.

[0033] In a specific embodiment of the present invention, Figure 3 , Figure 4 and Figure 5 As shown, the upper end of the upper hardware 101 is a spherical head structure, the lower connecting column of the lower hardware 102 is a screw structure, and the internal thread hand wheel 6 is threadedly connected to the screw.

[0034] Specifically, the spherical head structure of the upper hardware 101 corresponds to the size of the hemispherical cavity of the electrode pressing block 402 in the clamping mechanism 4, which can not only make the contact between the upper hardware 101 and the electrode pressing block 402 closer, but also ensure that the force on the upper hardware 101 and the electrode pressing block 402 is uniform when the zinc oxide lightning arrester is disassembled, assembled and tilted, thereby reducing the wear on the sliding surface.

[0035] In a specific embodiment of the present invention, Figure 3 and Figure 4As shown, the clamping mechanism 4 includes a shell 401, an electrode clamp 402 and a pressure spring 403. The inner cavity of the shell 401 is a cylindrical hole with the hole opening facing downward. The electrode clamp 402 is a cylindrical part with a hemispherical hole groove at the bottom. The electrode clamp 402 coaxially slides in the inner cavity of the cylindrical hole of the shell 401 and can slide up and down. The pressure spring 403 is coaxially sleeved in the inner cavity of the shell 401 and elastically clamps the electrode clamp 402 from above; the spherical head of the upper hardware 101 falls into the hemispherical hole groove.

[0036] Specifically, the clamping mechanism 4 is installed on the upper side of the upper mounting plate 2 by bolts. In the normal installation state, the pressure spring 403 gives a certain pre-pressure to the electrode clamp 402 at the upper part, so that the electrode clamp 402 can clamp the upper end hardware 101 on the lower side. When disassembling the zinc oxide lightning arrester 1, the upper end hardware 101 pushes the electrode clamp 402 upward and tilts at a certain small angle, so that the lower end hardware 102 is detached from the U-shaped hole on the lower mounting plate 3. The reverse process is the installation step of the zinc oxide lightning arrester 1.

[0037] In a specific embodiment of the present invention, Figure 1 and Figure 2 As shown, the mounting bracket 7 is fixedly connected to the bottom surface of the lower mounting plate 3 , and the terminal block 8 is fixedly connected to the housing 401 .

[0038] Specifically, the mounting bracket 7 is a part that connects the new parallel lightning arrester that is easy to disassemble and assemble and the external power mounting bracket. If the external mounting structure allows direct connection of the lower mounting plate 3, the mounting bracket 7 can be omitted. At the same time, replacements with simple mounting structures such as other frame-type brackets, mounting plates, etc. also fall within the protection scope of the present utility model.

[0039] The terminal block 8 is a connection terminal for an external power transmission cable, and is a substitute for simple structures such as an O-type crimping terminal and a cable terminal, and also falls within the protection scope of the present utility model.

[0040] The utility model is a parallel lightning arrester that is easy to disassemble and assemble: during the first installation, the mounting bracket 7 is first connected to the external mounting structure, and then the lower mounting plate 3 is welded to the upper part of the mounting bracket 7, and then the composite insulator 9 is bolted to the upper part of the lower mounting plate 3, and then the upper mounting plate 2 is bolted to the upper part of the composite insulator 9, and then the clamping mechanism 4 is bolted to the corresponding positions of the four through-hole positions on the upper part of the upper mounting plate 2, and finally the terminal board 8 is bolted to the corresponding screw hole positions of the clamping mechanism 4, and the assembly of the mounting frame is completed. Then tilt the zinc oxide lightning arrester 1 at a certain angle, insert the upper hardware 101 into the lower part of the clamping mechanism 4 and contact the electrode pressing block 402, push the zinc oxide lightning arrester 1 upward so that the lower hardware 102 passes through the U-shaped groove on the lower mounting plate 3, then the zinc oxide lightning arrester 1 is vertical and close to the lower mounting plate 3, insert the positioning gasket 5 into the screw of the lower hardware 102 from below, then the internal thread handwheel 6 is screwed into the screw of the lower hardware 102 and rotates to press the positioning gasket 5, so that the positioning gasket 5 is pressed into the circular groove under the lower mounting plate 3, so that one zinc oxide lightning arrester 1 is installed, and the installation of the remaining three zinc oxide lightning arresters 1 is repeated. The disassembly of the zinc oxide lightning arrester 1 is the reverse process of the installation process.

[0041] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0042] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A parallel lightning arrester that is easy to disassemble and assemble, comprising a vertical composite insulator (9) in the middle and a plurality of vertical zinc oxide lightning arresters (1) around it, characterized in that: It also includes an upper mounting plate (2), a lower mounting plate (3), a clamping mechanism (4), a positioning gasket (5) and an internally threaded handwheel (6); the lower mounting plate (3) is horizontally mounted on the lower part of the composite insulator (9); a plurality of U-shaped holes are provided on the edge of the lower mounting plate (3); the upper mounting plate (2) is horizontally mounted on the upper part of the composite insulator (9); a plurality of through holes are provided on the upper mounting plate (2); upper and lower ends of the zinc oxide lightning arrester (1) are respectively provided with an upper end fitting (101) and a lower end fitting (102); the lower end fitting (102) passes through the U-shaped hole and is fitted with the positioning gasket (5) and then fixed to the lower mounting plate (3) by an internally threaded handwheel (6); the clamping mechanism (4) is fixedly connected above the through hole of the upper mounting plate (2); the upper end fitting (101) passes through the through hole and is clamped by the clamping mechanism (4) at the same time.

2. The parallel lightning arrester that is easy to assemble and disassemble according to claim 1 is characterized in that: The bottom surface of the lower mounting plate (3) is provided with a circular groove at the position of the U-shaped hole, and the position of the circular groove corresponds to the axis of the zinc oxide arrester (1); the diameter of the circular groove matches the outer circle of the positioning gasket (5).

3. The parallel arrester that is easy to assemble and disassemble according to claim 1 is characterized in that: The upper end of the upper end fitting (101) is a spherical head structure, the lower connecting column of the lower end fitting (102) is a screw rod structure, and the internal thread hand wheel (6) is threadedly connected to the screw rod.

4. The parallel arrester that is easy to assemble and disassemble according to claim 3 is characterized in that: The clamping mechanism (4) comprises a shell (401), an electrode clamp (402) and a pressure spring (403); the inner cavity of the shell (401) is a cylindrical hole with the hole opening facing downward; the electrode clamp (402) is a cylindrical part with a hemispherical hole groove at the bottom; the electrode clamp (402) coaxially slides in the inner cavity of the cylindrical hole of the shell (401) and can slide up and down; the pressure spring (403) is coaxially sleeved in the inner cavity of the shell (401) and elastically presses the electrode clamp (402) from above; the spherical head of the upper end hardware (101) falls into the hemispherical hole groove.

5. The parallel arrester that is easy to assemble and disassemble according to claim 4 is characterized in that: It also includes a mounting bracket (7) for installation and a continuous wiring board (8), wherein the mounting bracket (7) is fixedly connected to the bottom surface of the lower mounting plate (3), and the wiring board (8) is fixedly connected to the housing (401).

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