High-safety lightning arrester

Abstract

The utility model relates to a high-safety lightning arrester, relates to the technical field of lightning arresters, and is suitable for a composite housed lightning arrester filled with gas. The interior of the resistor is mainly composed of an insulating tube, sealing fittings fixedly arranged at the two ends of the insulating tube and a plurality of resistor discs located in the insulating tube, the periphery of the insulating tube is wrapped by a silicone rubber jacket, and a plurality of umbrella skirts are distributed on the circumference of the silicone rubber jacket; a plurality of pressure release holes are formed in the insulating tube, insulating hole breaking pieces are arranged at the opening edges, facing the silicone rubber outer sleeve, of the pressure release holes, and the hole breaking pieces are located between the insulating tube and the silicone rubber outer sleeve; in a normal state, the hole breaking piece is used for blocking the pressure release hole; when a fault occurs, high temperature generated by a short-circuit current can enable gas in the lightning arrester to rapidly expand, the hole breaking piece is forced to be separated from the edge of the pressure release hole by the internal suddenly-rising pressure, and the corresponding hole is broken from inside to outside from the silicon rubber outer sleeve, so that the pressure in the lightning arrester can be rapidly released from the broken hole.

Description

Technical Field

[0001] The present application relates to the technical field of lightning arresters, and in particular to a high-safety lightning arrester. Background Art

[0002] The widely used lightning arrester, as an important electrical equipment in the electrical system, is equipped with a resistor with excellent nonlinear characteristics. Based on the excellent protection characteristics of the resistor, it can effectively conduct overvoltage energy into the earth, demonstrating excellent overvoltage protection performance.

[0003] Specifically, a type of lightning arrester design in current technology includes an insulating tube body, sealing hardware fixed at both ends of the insulating tube body, and a silicone rubber jacket mounted on the circumference of the insulating tube body. The silicone rubber jacket is formed with a number of umbrella skirt structures around the circumference, and a number of resistor sheets are arranged inside the insulating tube body, wherein there is a gap between the circumference of the resistor sheet and the inner wall of the insulating tube body for gas circulation.

[0004] However, under extreme operating conditions, such as when the arrester is damaged, the system's power-frequency voltage can generate a large short-circuit current inside the arrester, causing the internal gas to expand rapidly due to heat. If the internal gas pressure exceeds the load-bearing limit of the arrester's casing, there is a potential risk of a shattering explosion, which undoubtedly poses a threat to equipment safety and system operation. Therefore, optimization and improvement of this technical issue are urgently needed. Utility Model Content

[0005] The purpose of this application is to provide a high-safety lightning arrester to solve the risk problem caused by the sudden increase in internal gas pressure when the above-mentioned lightning arrester is short-circuited.

[0006] The high-safety lightning arrester provided in this application adopts the following technical solution:

[0007] A high-safety lightning arrester comprises an insulating tube, sealing hardware fixed at both ends of the insulating tube, and a plurality of resistor plates located within the insulating tube. The outer periphery of the insulating tube is wrapped with a silicone rubber jacket, and a plurality of sheds are fixed on the circumference of the silicone rubber jacket along the axial direction of the insulating tube. The insulating tube is provided with a plurality of pressure release holes, and an insulating rupture piece is fixed at the opening edge of the pressure release hole toward the silicone rubber jacket, and the rupture piece is located between the insulating tube and the silicone rubber jacket. Under normal conditions, the rupture piece is used to seal the pressure release hole. When a fault occurs, the rupture piece is separated from the edge of the pressure release hole under the pressure of gas pressure and ruptures a corresponding hole in the silicone rubber jacket.

[0008] By adopting the above technical solution, in the fixing method of the rupture piece, when the lightning arrester is operating normally, the rupture piece is fixed to the opening edge of the pressure release hole to seal the pressure release hole; in the event of a short circuit fault during the operation of the lightning arrester, the internal gas pressure suddenly rises due to heat, and at this time the rupture piece is separated from the edge of the pressure release hole under the action of the gas pressure, the fixing force of the rupture piece fails, and the side of the rupture piece facing the silicone rubber jacket breaks the corresponding hole in the silicone rubber jacket under the action of the gas pressure, so that the internal pressure is released from the broken hole in time, avoiding the occurrence of a pulverizing explosion, and improving the safety performance of the lightning arrester during application.

[0009] Optionally, the piercing member includes a piercing body and a raised portion fixed to one side of the piercing body, the raised portion is conical in shape, and the raised portion abuts against the inner wall of the silicone rubber jacket.

[0010] By adopting the above technical solution, due to the coordinated arrangement of the rupture body and the raised portion, the rupture piece can quickly rupture the corresponding hole in the silicone rubber outer shell under the pressure of the expanding gas, reducing the possibility that the rupture piece cannot rupture the corresponding hole, thereby improving the safety performance of the lightning arrester during application.

[0011] Optionally, the insulating tube is provided with a recessed groove for the piercing body to be placed and fixed on the inner edge of the opening of the pressure release hole toward the silicone rubber outer sleeve.

[0012] By adopting the above technical solution, due to the opening of the sinking groove, when the hole-breaking component is assembled and used, the hole-breaking body can be placed inside the sinking groove and fixed, thereby reducing the possibility of the hole-breaking component being loosened during installation under normal circumstances and improving the stability and sealing performance of the hole-breaking component under normal circumstances.

[0013] Optionally, the plurality of pressure release holes are evenly distributed in staggered positions around the insulating tube.

[0014] By adopting the above technical solution, due to the staggered distribution of the pressure release holes, the holes broken by the piercing member are distributed more evenly, and the expanded gas is also discharged more evenly, reducing the possibility of the expanded gas being discharged concentratedly in a part of the holes, thereby further reducing the possibility of a pulverizing explosion.

[0015] Optionally, the inner interface of the silicone rubber outer shell between adjacent umbrella skirts is in contact with the opening edge of the pressure release hole.

[0016] By adopting the above technical solution, since the thickness of the silicone rubber jackets of adjacent sheds is relatively small, it is convenient for the piercing member to pierce corresponding holes in the silicone rubber jackets under the action of gas pressure when a short circuit occurs.

[0017] Optionally, a sealing groove is provided on the periphery of the sealing hardware for the silicone rubber jacket to be embedded during vulcanization molding.

[0018] By adopting the above technical solution, when the silicone rubber jacket is vulcanized and formed, the silicone rubber is filled into the sealing groove on the sealing hardware, thereby achieving a tight combination of the silicone rubber jacket, the sealing hardware and the insulating tube.

[0019] Optionally, the number of sealing grooves at the same end of the sealing fitting is at least two.

[0020] By adopting the above technical solution, since the number of sealing grooves at the same end is at least two, the sealing performance of the silicone rubber jacket is further improved, and the possibility of poor sealing of the lightning arrester during use is reduced.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. Due to the structural design of the rupture piece, when a short circuit occurs during the operation of the arrester, the internal gas pressure rises suddenly due to the short circuit current. At this time, the rupture piece is separated from the edge of the pressure release hole under the action of the gas pressure, and the fixing force of the rupture piece fails. The side of the rupture piece facing the silicone rubber jacket breaks the corresponding hole in the silicone rubber jacket under the action of the gas pressure, so that the internal pressure is released from the broken hole in time, avoiding the occurrence of a pulverizing explosion and improving the safety performance of the arrester during application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the explosion structure of an embodiment of the present application;

[0026] Figure 3 is a schematic cross-sectional structural diagram of an embodiment of the present application;

[0027] Figure 4 yes Figure 3 A partial enlarged schematic diagram of part A;

[0028] Figure 5 yes Figure 3 A partial enlarged schematic diagram of part B.

[0029] In the figure, 1. Insulating tube; 11. Pressure relief hole; 12. Sink; 2. Sealing hardware; 21. Sealing groove; 3. Resistor; 4. Silicone rubber jacket; 41. Umbrella skirt; 5. Hole-breaking member; 51. Hole-breaking body; 52. Protruding portion. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0031] Example:

[0032] Reference Figure 1 、 Figure 2 and Figure 3 A high-safety lightning arrester includes an insulating tube 1, sealing hardware 2 fixed at both ends of the insulating tube 1, and several resistors 3 located in the insulating tube 1. There is a gap between the resistors 3 and the inner wall of the insulating tube 1; the outer periphery of the insulating tube 1 is wrapped with a silicone rubber jacket 4, and the silicone rubber jacket 4 has several sheds 41 integrally formed along its own axial direction.

[0033] Reference Figure 3 and Figure 4 One end of the sealing hardware 2 is tightly fixed to the inner wall of the insulating tube 1 by means of threaded fitting, and a part of the sealing hardware 2 is located outside the insulating tube 1; a sealing groove 21 is provided on the sealing hardware 2 for injection during the vulcanization molding of the silicone rubber jacket 4; and there are two sealing grooves 21 at the same end of the sealing hardware 2, thereby realizing the assembly and fixation of the silicone rubber jacket 4, the sealing hardware 2 and the insulating tube 1.

[0034] Reference Figure 3 and Figure 4 A mounting groove 43 is provided on the inner wall of the silicone rubber jacket 4 for inserting the outer edge of the insulating tube 1; when the silicone rubber jacket 4 is installed, the outer edge of the insulating tube 1 is inserted into the mounting groove 43 on the inner wall of the silicone rubber jacket 4, thereby further improving the installation stability between the insulating tube 1 and the silicone rubber jacket 4.

[0035] Reference Figure 3 and Figure 5 The insulating tube 1 is provided with a plurality of pressure relief holes 11, and a recessed groove 12 is provided on the inner edge of the opening of the insulating tube 1 at the pressure relief holes 11 facing the silicone rubber jacket 4; an insulating piercing member 5 is fixedly provided on the opening edge of the insulating tube 1 at the pressure relief holes 11 facing the silicone rubber jacket 4, and the piercing member 5 is located between the insulating tube 1 and the silicone rubber jacket 4; the piercing member 5 includes a piercing body 51 and a raised portion 52 integrally formed on one side of the piercing body 51, wherein the raised portion 52 is conical in shape, abuts against the inner wall of the silicone rubber jacket 4, and has a conical profile;

[0036] When the arrester is operating normally, the rupture body 51 is fixed with sealant to seal the pressure release hole 11; when a short circuit occurs during the operation of the arrester, the gas inside expands rapidly. At this time, the rupture member 5 is separated from the edge of the pressure release hole 11 by the pressure of the gas, the fixing force of the sealant fails, and the conical tip of the raised part 52 breaks the corresponding hole in the silicone rubber jacket 4 under the action of the gas pressure, so that the rapidly expanding gas can be discharged from the broken hole in time, avoiding the risk of a pulverizing explosion.

[0037] Reference Figure 3 and Figure 5 The inner interface of the silicone rubber jacket 4 between adjacent umbrella skirts 41 is in contact with the opening edge of the pressure release hole 11; since the thickness of the inner wall portion of the silicone rubber jacket 4 between adjacent umbrella skirts 41 is relatively small, it is convenient for the raised portion 52 to break open the corresponding hole under the action of gas pressure when a short circuit occurs.

[0038] Reference Figure 2 and Figure 3 The plurality of pressure release holes 11 are evenly distributed around the insulating tube 1, and due to the staggered distribution of the pressure release holes 11, the holes opened by the piercing member 5 are more evenly distributed, and the expanded gas is also discharged more evenly, reducing the possibility of the expanded gas being discharged from a part of the holes, thereby further reducing the possibility of a pulverizing explosion.

[0039] The implementation principle of the embodiment of this application is:

[0040] When the arrester is operating normally, the puncture body 51 is fixed with the sealant to seal the pressure release hole 11. Under the action of the internal gas, the pressure on the puncture body 51 is less than the adhesion of the sealant. When a short circuit occurs during the operation of the arrester, the internal gas expands rapidly. At this time, the puncture member 5 is separated from the edge of the pressure release hole 11 by the pressure of the gas, the fixing force of the sealant fails, and the conical tip of the raised part 52 breaks the corresponding hole in the silicone rubber jacket 4 under the action of the gas pressure, so that the rapidly expanding gas can be discharged from the broken hole in time.

[0041] Unless otherwise defined, the terms or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "A" or "one" and other similar words do not indicate a quantity limit, but rather indicate the existence of at least one. "Include" or "comprising" and other similar words mean that the elements or objects appearing before "include" or "comprising" cover the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A high-safety lightning arrester, comprising an insulating tube (1), sealing fittings (2) fixed at both ends of the insulating tube (1), and a plurality of resistors (3) located in the insulating tube (1), wherein the outer periphery of the insulating tube (1) is wrapped with a silicone rubber jacket (4), and a plurality of sheds (41) are fixed on the circumference of the silicone rubber jacket (4) along the axial direction of the insulating tube (1); It is characterized in that The insulating tube (1) is provided with a plurality of pressure release holes (11), and the insulating tube (1) is fixed with an insulating puncture piece (5) at the opening edge of the pressure release hole (11) facing the silicone rubber jacket (4), and the puncture piece (5) is located between the insulating tube (1) and the silicone rubber jacket (4); Under normal conditions, the piercing member (5) is used to seal the pressure release hole (11); when a fault occurs, the piercing member (5) is forced to separate from the edge of the pressure release hole (11) by the gas pressure and breaks a corresponding hole in the silicone rubber jacket (4).

2. A high-safety lightning arrester according to claim 1, characterized in that: The piercing member (5) comprises a piercing body (51) and a raised portion (52) fixed to one side of the piercing body (51); the raised portion (52) is conical in shape, and the raised portion (52) abuts against the inner wall of the silicone rubber jacket (4).

3. A high-safety lightning arrester according to claim 2, characterized in that: The insulating tube (1) is provided with a sinking groove (12) on the inner edge of the opening of the pressure release hole (11) toward the silicone rubber outer shell (4) for the hole body (51) to be placed and fixed.

4. A high-safety lightning arrester according to claim 1, characterized in that: The plurality of pressure release holes (11) are evenly distributed in a staggered manner around the insulating tube (1).

5. A high-safety lightning arrester according to claim 1, characterized in that: The inner interface of the silicone rubber outer shell (4) between adjacent umbrella skirts (41) is in contact with the opening edge of the pressure release hole (11).

6. A high-safety lightning arrester according to claim 1, characterized in that: The sealing hardware (2) is provided with a sealing groove (21) on its circumference for the silicone rubber jacket (4) to be embedded during vulcanization molding.

7. A high-safety lightning arrester according to claim 6, characterized in that: The number of the sealing grooves (21) at the same end of the sealing fitting (2) is at least two.

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