Two-body vacuum arc-extinguishing outdoor grading ring

Abstract

The utility model discloses a two-body vacuum arc-extinguishing outdoor grading ring comprising a first arc-shaped member and a second arc-shaped member, the first arc-shaped member and the second arc-shaped member are made of the same metal material, the inner side of the first arc-shaped member is provided with a first arc-shaped groove, the inner side of the second arc-shaped member is provided with a second arc-shaped groove, and the first arc-shaped groove and the second arc-shaped groove are made of metal materials. The first arc-shaped piece and the second arc-shaped piece are oppositely connected to form a complete circular ring, the first arc-shaped piece and the second arc-shaped piece are connected through screws, and the two ends of the first arc-shaped groove and the two ends of the second arc-shaped groove are connected to form a complete circular-ring-shaped groove. According to the utility model, the condition of non-uniform distribution of electric fields on the outer edge surface of the vacuum arc-extinguishing chamber is improved, and the flashover phenomenon on the edge surface in the aging process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vacuum interrupter technology, specifically to a two-body vacuum interrupter external equalizing ring. Background Technology

[0002] During the withstand voltage test of a vacuum interrupter, the presence of stray capacitance to ground causes potential shifts and electric field distortions throughout the chamber. Uneven voltage distribution and concentrated electric field in the ceramic shell can lead to surface flashover. Surface flashover in a vacuum interrupter can cause irreversible damage to the ceramic shell and increase the probability of shell breakdown.

[0003] According to the Secondary Electron Emission Avalanche (SEEA) model, surface flashover mainly involves the initial electrons generated at the three-junction junction (CTJ) colliding with the insulator surface to emit secondary electrons, the desorption of surface-adsorbed gas, and subsequent collisional ionization. In the electric field distribution diagram of the outer surface of the ceramic shell, electric field spikes often appear at the ceramic-shield-gas three-junction junction. Therefore, it is necessary to improve the outdoor insulation structure of the vacuum arc interrupter to make its electric field distribution more uniform and eliminate the electric field spikes at the ceramic-shield-gas three-junction junction.

[0004] Most high-voltage vacuum interrupters lack preventative measures against surface flashover, resulting in noticeable flashover marks on the ceramic shell surface during aging and a high risk of breakdown. Currently, one approach involves coating the three junctions with semi-conductive silicone rubber to improve surface flashover resistance. This utilizes the electric field relaxation properties of semi-conductive silicone rubber to increase the creepage distance of the vacuum interrupter under high voltage, thereby enhancing the surface flashover resistance of the ceramic shell. However, silicone rubber coating requires a high-temperature environment, which, being not a vacuum, greatly increases the risk of oxidation of the vacuum interrupter's metal components. Furthermore, air may remain between the silicone rubber and the interrupter during the coating process, leading to a decrease in the external insulation performance of the interrupter. Silicone is a rubber-based product, and the interface will age over time, also causing a decline in insulation performance.

[0005] Furthermore, without silicone rubber coating, a few black spots were observed on the three-junction surface of the arc-extinguishing chamber after surface flashover; after silicone rubber coating, numerous black spots formed on the surface of the arc-extinguishing chamber after surface flashover, which would damage the surface insulation of the ceramic shell. Therefore, if a scheme of coating the three-junction with semi-conductive silicone rubber is chosen, sufficient insulation margin must be ensured along the ceramic shell surface to prevent surface flashover. Otherwise, if surface flashover occurs, the glaze layer on the ceramic shell surface will be damaged, leaving irreversible discharge traces and damage, which will have a certain impact on the insulation performance and service life of the arc-extinguishing chamber. Utility Model Content

[0006] This invention provides a two-body vacuum interrupter outer equalizing ring, which improves the uneven distribution of electric field along the surface of the vacuum interrupter and reduces surface flashover during the aging process.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0008] A two-body vacuum interrupter external equalizing ring includes a first arc-shaped component and a second arc-shaped component. The first arc-shaped component and the second arc-shaped component are made of the same metal material. The first arc-shaped component has a first arc-shaped groove on its inner side, and the second arc-shaped component has a second arc-shaped groove on its inner side. The first arc-shaped component and the second arc-shaped component are connected to each other to form a complete ring. They are connected by screws. The two ends of the first arc-shaped groove and the two ends of the second arc-shaped groove are joined to form a complete annular groove.

[0009] Furthermore, the upper surfaces of both ends of the first arc-shaped component are provided with a first stepped surface, and a threaded hole is formed on the first stepped surface. The lower surfaces of both ends of the second arc-shaped component are provided with a second stepped surface, and a hole is formed on the second stepped surface. The first stepped surface and the second stepped surface overlap, and the screw passes through the hole to connect to the threaded hole.

[0010] Furthermore, the cross-sections of the first and second arc-shaped components are circular.

[0011] Furthermore, the cross-sections of the first and second arc-shaped components are elliptical.

[0012] Furthermore, the inner diameters of the first and second arc-shaped components are adapted to the ceramic outer shell of the vacuum interrupter.

[0013] Furthermore, the width of the annular groove is greater than the joint width of the ceramic shell.

[0014] Furthermore, an arc-shaped copper sheet is welded to the seam of the ceramic shell, the arc-shaped copper sheet protruding from the surface of the ceramic shell and fitting into the annular groove.

[0015] Furthermore, the hole is a countersunk hole.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. Metal equalizing rings can effectively improve the uneven distribution of electric field around the vacuum interrupter and reduce surface flashover during the aging process.

[0018] 2. The metal equalizing ring has a simple structure, is easy to process, has a long service life, is not prone to aging, and reduces the maintenance cost of the arc-extinguishing chamber.

[0019] 3. The metal equalizing ring is easy to install and can be installed after the arc-extinguishing chamber is sealed and drained. In the subsequent aging process, it can improve the insulation stability of the vacuum arc-extinguishing chamber, thereby improving the aging efficiency and optimizing the entire process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the first arc-shaped component;

[0022] Figure 2 This is a schematic diagram of the structure of the second arc-shaped component;

[0023] Figure 3 This is a schematic diagram of the overall structure of the present invention installed on a vacuum interrupter;

[0024] Figure 4 for Figure 3 A sectional view of part A in the middle;

[0025] In the figure: 1-first arc-shaped component, 2-second arc-shaped component, 3-circular copper sheet, 4-first arc-shaped groove, 5-second arc-shaped groove, 6-first stepped surface, 7-threaded hole, 8-second stepped surface, 9-hole, 10-ceramic shell. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0028] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] As shown in the figure, a two-body vacuum arc-quenching external equalizing ring includes a first arc-shaped component 1 and a second arc-shaped component 2. Both the first arc-shaped component 1 and the second arc-shaped component 2 are made of metal. The inner side of the first arc-shaped component 1 is provided with a first arc-shaped groove 4, and the inner side of the second arc-shaped component 2 is provided with a second arc-shaped groove 5. The first arc-shaped component 1 and the second arc-shaped component 2 are connected to each other to form a complete ring. They are connected by screws. The two ends of the first arc-shaped groove 4 and the two ends of the second arc-shaped groove 5 are joined to form a complete annular groove.

[0030] Specifically, the upper surfaces of both ends of the first arc-shaped component 1 are provided with a first stepped surface 6, and a threaded hole 7 is provided on the first stepped surface 6. The lower surfaces of both ends of the second arc-shaped component 2 are provided with a second stepped surface 8, and a hole 9 is provided on the second stepped surface 8. The first stepped surface 6 and the second stepped surface 8 overlap, and the screw passes through the hole 9 to connect to the threaded hole 7.

[0031] Preferably, the cross-sections of the first arc-shaped component 1 and the second arc-shaped component 2 are circular or elliptical.

[0032] The inner diameters of the first arc-shaped component 1 and the second arc-shaped component 2 are adapted to the ceramic outer shell 10 of the vacuum interrupter. Preferably, the width of the annular groove is greater than the joint width of the ceramic outer shell 10.

[0033] To facilitate the installation of the equalizing ring, an arc-shaped copper sheet 3 is welded at the joint of the ceramic shell 10. The arc-shaped copper sheet 3 protrudes from the surface of the ceramic shell 10 and is adapted to the annular groove. During installation, the first arc-shaped part 1 and the second arc-shaped part 2 are snapped onto the annular copper sheet 3 and connected together with screws.

[0034] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A two-piece outer grading ring for a vacuum interrupter, characterized by: The first circular arc member (1) and the second circular arc member (2) are made of the same metal material, the first circular arc member (1) is internally provided with a first circular arc groove (4), the second circular arc member (2) is internally provided with a second circular arc groove (5), the first circular arc member (1) and the second circular arc member (2) are oppositely connected to form a complete circular ring, the first circular arc groove (4) and the second circular arc groove (5) are connected at both ends to form a complete circular groove through screw connection.

2. The two-part vacuum interrupter outer grading ring of claim 1, wherein: The upper surface of both ends of the first circular arc member (1) is provided with a first step surface (6), the first step surface (6) is provided with a threaded hole (7), the lower surface of both ends of the second circular arc member (2) is provided with a second step surface (8), the second step surface (8) is provided with a hole (9), the first step surface (6) and the second step surface (8) are overlapped, and a screw passes through the hole (9) and is connected with the threaded hole (7).

3. The two-part vacuum interrupter outer grading ring of claim 1, wherein: The cross section of the first circular arc member (1) and the second circular arc member (2) is circular.

4. The two-part vacuum interrupter outer grading ring of claim 1, wherein: The cross section of the first circular arc member (1) and the second circular arc member (2) is elliptical.

5. The two-part vacuum interrupter outer grading ring of claim 1, wherein: The inner diameter of the first circular arc member (1) and the second circular arc member (2) is matched with the ceramic shell (10) of the vacuum interrupter.

6. The two-part vacuum interrupter outer grading ring of claim 5, wherein: The width of the circular groove is greater than the joint width of the ceramic shell (10).

7. The two-part vacuum interrupter outer grading ring of claim 5, wherein: The joint of the ceramic shell (10) is welded with a circular arc copper sheet (3), the circular arc copper sheet (3) protrudes from the surface of the ceramic shell (10) and is matched with the circular groove.

8. The two-part vacuum interrupter outer grading ring of claim 2, wherein: The hole (9) is a countersunk hole.

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