Lightning arrester with porcelain jacket

Abstract

The utility model relates to a porcelain jacket lightning arrester, and relates to the technical field of lightning arresters, the porcelain jacket lightning arrester comprises a porcelain shell and a core body located in the porcelain shell, the outer circumferences of the two ends of the porcelain shell are fixedly sleeved with an upper flange and a lower flange respectively, the upper flange is fixedly provided with an upper pressing plate used for fixing one end of the core body, and the lower flange is fixedly provided with a lower pressing plate used for fixing the other end of the core body. A lower pressing plate for fixing the other end of the core body is fixedly arranged on the lower flange; an anti-explosion plate is fixedly arranged on the end face, away from the porcelain shell, of the upper pressing plate, a scribing groove is formed in the end face, facing a cavity opening of the porcelain shell, of the anti-explosion plate, a through hole is formed in the upper pressing plate, and closed gas in the porcelain shell can directly penetrate through the through hole to impact the scribing groove; according to the lightning arrester, when a short-circuit fault occurs in the operation process of the lightning arrester, the closed gas in the ceramic shell is sharply expanded, and the expanded gas applies pressure to the explosion-proof plate, so that the explosion-proof plate is torn at the scribed line groove, the internal pressure is released in time from the torn part, the possibility of comminuted explosion is reduced, and the service life of the lightning arrester is prolonged. And the safety performance of the lightning arrester in application is improved.

Description

Technical Field

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

[0002] Porcelain-jacketed surge arresters, also known as porcelain-jacketed arresters or porcelain-jacketed metal oxide arresters (MOAs), are crucial devices in power systems, used to protect them from atmospheric and switching overvoltages. With their superior structural characteristics, durable sealing, uniform potential distribution, and reliable pressure relief devices, these arresters play a vital role in protecting power transmission and substation equipment, capacitor banks, and motor neutral points from lightning strikes and switching overvoltages.

[0003] In the related art, a typical porcelain-coated arrester design includes an arrester body with a lower cover, explosion-proof panels, and upper cover mounted on either end. The explosion-proof panels also function as pressure relief devices. The arrester body is filled with a sealed gas. When a short circuit occurs in the arrester, the high temperature of the arc causes the gas to expand rapidly, creating pressure that impacts the explosion-proof panels.

[0004] However, in actual applications, due to material selection or other design factors, the expanding gas may not be able to effectively break through the explosion-proof plate, resulting in the arrester failing to release internal pressure as expected. In this case, the arrester may explode violently, posing a serious safety hazard to the power system. Utility Model Content

[0005] The purpose of this application is to provide a porcelain-coated lightning arrester to solve the problem in the above-mentioned related art that the explosion-proof plate may not be able to be broken through by the expanding gas, posing a safety hazard.

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

[0007] A porcelain-sheathed lightning arrester comprises a porcelain shell and a core body located within the porcelain shell, wherein an upper flange and a lower flange are fixedly sleeved on the outer circumferences of both ends of the porcelain shell, an upper pressure plate for fixing one end of the core body is fixedly provided on the upper flange, and a lower pressure plate for fixing the other end of the core body is fixedly provided on the lower flange; an explosion-proof plate is fixedly provided on the end surface of the upper pressure plate away from the porcelain shell, a groove is provided on the end surface of the explosion-proof plate facing the cavity of the porcelain shell, and a through hole is provided on the upper pressure plate, so that the enclosed gas in the porcelain shell can directly pass through the through hole to impact the groove.

[0008] By adopting the above technical solution, when a short circuit fault occurs during the operation of the lightning arrester, the enclosed gas in the porcelain shell expands rapidly due to the high temperature of the arc, and the suddenly rising pressure can directly impact the scored groove through the through hole. Since the scored groove is the weak point of the explosion-proof plate, the explosion-proof plate can be torn from the scored groove under the action of pressure, and the internal pressure can be released from the torn part in time, reducing the possibility of a pulverizing explosion and improving the safety performance of the lightning arrester during application.

[0009] Optionally, an explosion-proof pressure plate for fixing the explosion-proof plate is fixed on the side surface of the upper flange, and the inner diameter of the explosion-proof pressure plate is not less than the diameter of the scored groove.

[0010] By adopting the above technical solution, due to the installation setting of the explosion-proof pressure plate, the explosion-proof plate is located between the explosion-proof pressure plate and the upper pressure plate, thereby achieving the installation and fixation of the explosion-proof plate and reducing the possibility of the explosion-proof plate being loosened during application.

[0011] Optionally, the cross-sectional thickness of the explosion-proof pressure plate decreases in a direction approaching its own axis.

[0012] By adopting the above technical solution, under the premise of ensuring the installation stability of the explosion-proof plate, the raw materials required for the production of the explosion-proof pressure plate are reduced due to the reduced thickness of the fixed compression spring, thereby saving corresponding production costs.

[0013] Optionally, a limiting groove for the outer edge of the explosion-proof plate to be placed is provided on the side of the explosion-proof pressure plate.

[0014] By adopting the above technical solution, due to the setting of the limiting groove, when the explosion-proof plate is installed, the outer edge of the explosion-proof plate is limited to the limiting groove on the fixed pressure plate, thereby further improving the installation stability of the explosion-proof plate.

[0015] Optionally, a protective plate is provided on the side of the explosion-proof pressure plate away from the explosion-proof plate, and the protective plate is fixed on the end surface of the upper flange away from the porcelain shell, and there is a clearance gap between the protective plate and the explosion-proof pressure plate.

[0016] By adopting the above technical solution, when the explosion-proof plate is torn or even washed off from the groove by the expanding gas, it is protected by the protective plate so that the broken explosion-proof plate is placed in the gap, thereby preventing the broken part of the explosion-proof plate from flying around and accidentally injuring other electrical equipment or personnel, thereby further improving the corresponding safety performance.

[0017] Optionally, a plurality of fixing bosses are fixed on the outer peripheral skirt of the upper flange, and mounting holes are provided on the fixing bosses; fixing ears corresponding to the fixing bosses are fixed on the outer periphery of the protective plate, and fixing holes that can coincide with the mounting holes are provided on the fixing ears; and locking bolts are provided on the side of the porcelain shell for penetrating the mounting holes and the fixing holes to fix the protective plate.

[0018] By adopting the above technical solution, due to the coordinated arrangement of the fixing boss, the fixing ear and the locking bolt, when the protective plate needs to be installed and fixed, the locking bolt is passed through the mounting hole and the fixing hole and then the protective plate is fixed to the upper flange, thereby realizing the installation and fixation of the protective plate.

[0019] Optionally, a first sealing ring is provided on the side of the ceramic shell, and a first sealing ring groove for receiving the first sealing ring is opened on the side of the upper pressing plate facing the ceramic shell.

[0020] By adopting the above technical solution, due to the coordinated arrangement of the first sealing ring and the corresponding first sealing ring groove, the sealing performance of the lightning arrester during operation is improved, and the possibility of leakage of the enclosed gas in the porcelain shell is reduced.

[0021] Optionally, a second sealing ring is provided on the side of the ceramic shell, and a second sealing ring groove for inserting the second sealing ring is opened on the side of the upper pressure plate facing the explosion-proof plate.

[0022] By adopting the above technical solution, due to the coordinated arrangement of the second sealing ring and the corresponding second sealing ring groove, the sealing performance of the lightning arrester during operation is further improved, and the possibility of leakage of the enclosed gas in the porcelain shell is further reduced.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Since the scored groove is the weak point of the explosion-proof plate, when a short circuit fault occurs during the operation of the lightning arrester, the enclosed gas in the porcelain shell expands rapidly, and the expanded gas exerts pressure on the explosion-proof plate, causing the explosion-proof plate to be torn at the scored groove, thereby releasing the internal pressure from the torn part in time, reducing the possibility of a pulverizing explosion and improving the safety performance of the lightning arrester during application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the explosion structure of the embodiment of the present application, which embodies the installation distribution of the upper flange, upper pressure plate, explosion-proof plate and explosion-proof pressure plate;

[0028] Figure 3 This is a schematic diagram of the explosion structure of the embodiment of the present application, which embodies the installation distribution of the upper pressure plate, explosion-proof plate and explosion-proof pressure plate;

[0029] Figure 4 This is a schematic cross-sectional view of the installation and coordination of the explosion-proof plate according to an embodiment of the present application;

[0030] Figure 5 yes Figure 4 A magnified schematic diagram of part A;

[0031] Figure 6 yes Figure 4 Schematic diagram of the enlarged portion B.

[0032] In the figure, 1. porcelain shell; 11. upper flange; 111. fixing boss; 1111. mounting hole; 12. lower flange; 13. first sealing ring; 14. second sealing ring; 2. core; 3. upper pressure plate; 31. through hole; 32. first sealing ring groove; 33. second sealing ring groove; 4. lower pressure plate; 5. explosion-proof plate; 51. engraved groove; 6. explosion-proof pressure plate; 61. limit groove; 7. protective plate; 71. fixing ear; 711. fixing hole; 8. locking bolt. DETAILED DESCRIPTION

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

[0034] Example:

[0035] Reference Figure 1 and Figure 2 A porcelain-sheathed lightning arrester comprises a porcelain shell 1 and a core 2 located inside the porcelain shell 1, wherein an upper flange 11 and a lower flange 12 are fixedly sleeved on the outer circumference of both ends of the porcelain shell 1, an upper pressure plate 3 for fixing one end of the core 2 is fixedly provided on the upper flange 11 by screws, and a lower pressure plate 4 for fixing the other end of the core 2 is fixedly provided on the lower flange 12 by screws; an explosion-proof plate 5 is fixedly provided above the upper pressure plate 3 away from the cavity of the porcelain shell 1.

[0036] Reference Figure 3 、 Figure 4 and Figure 5 The explosion-proof plate 5 is a copper plate with a thickness of 0.2 mm. A V-shaped groove 51 is provided on the side of the explosion-proof plate 5 facing the porcelain shell 1. Two through holes 31 are provided on the upper pressing plate 3. The two through holes 31 are symmetrically arranged, and the cross-sectional shape of the through holes 31 is semicircular.

[0037] There is a closed gas inside the porcelain shell 1. When a short circuit or other fault occurs during the operation of the lightning arrester, the closed gas in the porcelain shell 1 expands rapidly and can directly pass through the through hole 31 to impact the scored groove 51. Since the scored groove 51 is the weak point of the explosion-proof plate 5, the expanded gas exerts pressure on the explosion-proof plate 5, causing the explosion-proof plate 5 to tear from the scored groove 51, thereby allowing the sudden increase in internal pressure to be released in time from the torn point, reducing the possibility of a pulverizing explosion.

[0038] Reference Figure 4 and Figure 6 , an explosion-proof pressure plate 6 for fixing the explosion-proof plate 5 is fixed on the end surface of the upper flange 11, and the inner diameter of the explosion-proof pressure plate 6 is not less than the diameter of the scored groove 51; wherein the explosion-proof plate 5 is located between the explosion-proof pressure plate 6 and the upper pressure plate 3, and a limiting groove 61 for the explosion-proof plate 5 to be placed is opened on the end surface of the explosion-proof pressure plate 6;

[0039] When the explosion-proof plate 5 is installed inside the limiting groove 61, one side of the explosion-proof pressure plate 6 abuts against one side of the upper pressure plate 3; the screws pass through the abutting parts of the explosion-proof pressure plate 6 and the upper pressure plate 3 and continue to be screwed onto the upper flange 11, thereby realizing the installation and fixation of the explosion-proof plate 5.

[0040] Reference Figure 4 The cross-sectional thickness of the explosion-proof pressure plate 6 decreases in the direction close to its own axis, thereby reducing the raw materials required for the production of the explosion-proof pressure plate 6 while ensuring the installation stability of the explosion-proof plate 5, thereby saving production costs.

[0041] Reference Figure 4 The end face of the porcelain shell 1 is provided with a first sealing ring 13 and a second sealing ring 14 made of rubber. A first sealing ring groove 32 for inserting the first sealing ring 13 is opened on the end face of the upper pressure plate 3 facing the porcelain shell 1, and a second sealing ring groove 33 for inserting the second sealing ring 14 is opened on the end face of the upper pressure plate 3 facing the explosion-proof plate 5; thereby reducing the possibility of leakage of the enclosed gas inside the porcelain shell 1 during normal use of the lightning arrester and improving the performance of the lightning arrester.

[0042] Reference Figure 4 and Figure 5 A protective plate 7 is provided above the explosion-proof pressure plate 6 away from the explosion-proof plate 5, wherein the protective plate 7 is fixedly arranged above the upper flange 11 away from the cavity of the porcelain shell 1, and there is a clearance between the protective plate 7 and the explosion-proof pressure plate 6; when the explosion-proof plate 5 is cracked or even washed off from the scored groove 51 by the expanding gas, it is protected by the protective plate 7 to prevent the cracked part of the explosion-proof plate 5 from splashing around and accidentally injuring the staff.

[0043] Reference Figure 2 and Figure 4Three fixing bosses 111 are integrally formed on the outer skirt of the upper flange 11, and mounting holes 1111 are opened on the fixing bosses 111; fixing ears 71 corresponding to the fixing bosses 111 are integrally formed on the outer periphery of the protective plate 7, and fixing ears 71 are opened on the fixing ears 71 to coincide with the mounting holes 1111; the side of the porcelain shell 1 is provided with a locking bolt 8 that passes through the mounting holes 1111 and the fixing holes 711 to fix the protective plate 7, thereby realizing the installation and fixation of the protective plate 7.

[0044] The implementation principle of the embodiment of this application is:

[0045] When the arrester is operating normally, the explosion-proof plate 5 acts as a seal to prevent the enclosed gas in the porcelain shell 1 from leaking; when a short circuit or other fault occurs during the operation of the arrester, the enclosed gas in the porcelain shell 1 expands rapidly and can directly pass through the through hole 31 to impact the scored groove 51. Since the scored groove 51 is the weak point of the explosion-proof plate 5, the expanded gas exerts pressure on the explosion-proof plate 5, causing the explosion-proof plate 5 to tear from the scored groove 51, thereby releasing the suddenly rising internal pressure from the torn part in time.

[0046] 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.

[0047] 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 porcelain-coated lightning arrester, comprising a porcelain shell (1) and a core (2) located in the porcelain shell (1), wherein an upper flange (11) and a lower flange (12) are fixedly sleeved on the outer circumference of both ends of the porcelain shell (1), an upper pressure plate (3) for fixing one end of the core (2) is fixedly provided on the upper flange (11), and a lower pressure plate (4) for fixing the other end of the core (2) is fixedly provided on the lower flange (12); It is characterized by: An explosion-proof plate (5) is fixedly provided above the upper pressure plate (3) away from the cavity opening of the porcelain shell (1); a groove (51) is provided on the end surface of the explosion-proof plate (5) facing the cavity opening of the porcelain shell (1); a through hole (31) is provided on the upper pressure plate (3); and the enclosed gas in the porcelain shell (1) can directly pass through the through hole (31) to impact the groove (51).

2. The porcelain-coated arrester according to claim 1, characterized in that: An explosion-proof pressure plate (6) for fixing the explosion-proof plate (5) is fixed on the end surface of the upper flange (11), and the inner diameter of the explosion-proof pressure plate (6) is not less than the diameter of the scored groove (51).

3. The porcelain-coated arrester according to claim 2, characterized in that: The cross-sectional thickness of the explosion-proof pressure plate (6) decreases in a direction approaching its own axis.

4. The porcelain-coated lightning arrester according to claim 2, characterized in that: A limiting groove (61) for the outer edge of the explosion-proof plate (5) to be placed is provided on the side surface of the explosion-proof pressure plate (6).

5. The porcelain-coated arrester according to claim 2, characterized in that: A protective plate (7) is provided above the explosion-proof pressure plate (6) away from the cavity opening of the explosion-proof plate (5). The protective plate (7) is fixed on the side of the upper flange (11) away from the porcelain shell (1), and a clearance gap exists between the protective plate (7) and the explosion-proof pressure plate (6).

6. The porcelain-coated arrester according to claim 5, characterized in that: A plurality of fixing bosses (111) are fixedly provided on the outer peripheral skirt of the upper flange (11), and mounting holes (1111) are opened on the fixing bosses (111); A fixing ear (71) corresponding to the fixing boss (111) is fixedly provided on the outer periphery of the protective plate (7), and a fixing hole (711) capable of coinciding with the mounting hole (1111) is provided on the fixing ear (71); and a locking bolt (8) is provided on the side of the ceramic shell (1) and passes through the mounting hole (1111) and the fixing hole (711) to fix the protective plate (7).

7. The porcelain-coated arrester according to claim 1, characterized in that: The end surface of the ceramic shell (1) is provided with a first sealing ring (13), and the side surface of the upper pressure plate (3) facing the cavity of the ceramic shell (1) is provided with a first sealing ring groove (32) for the first sealing ring (13) to be placed.

8. The porcelain-coated arrester according to claim 7, characterized in that: The end surface of the ceramic shell (1) is provided with a second sealing ring (14), and the side of the upper pressure plate (3) facing the explosion-proof plate (5) is provided with a second sealing ring groove (33) for the second sealing ring (14) to be placed.

Images