A solid-seal pole for air tank

Abstract

A kind of solid seal pole includes solidification formed insulating shell, arc-extinguishing chamber with silicone rubber and conductive terminal;And the conductive terminal that arc-extinguishing chamber is fastened is located at the lower end of insulating shell;Conductive terminal is provided with recess, the inner wall of recess forms inner boss on one side, recess outer wall forms outer boss on one side, outer boss is higher than inner boss, the end surface of inner boss is in contact with the end surface of static conductive rod of arc-extinguishing chamber, and outer boss extrudes the silicone rubber on arc-extinguishing chamber;The inner wall of insulating shell is provided with inner flange, and inner flange extends to the flat surface of silicone rubber in arc-extinguishing chamber dynamic end cover plate part, so that the solidification formed insulating shell can fasten arc-extinguishing chamber.The beneficial effects of the present application are: outer boss of conductive terminal is tightly pressed to silicone rubber, effectively avoids pouring solidification epoxy resin to flow into the lap joint surface between static conductive rod and conductive terminal of arc-extinguishing chamber;And after solidification, under the extrusion of outer boss, inner flange and insulating shell, silicone rubber is tightly held by insulating shell, and air gap is eliminated.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power distribution equipment, and specifically to a solid-sealed pole that can be used in an air-cooled switchgear. Background Technology

[0002] Solid-sealed poles are integrated poles that combine vacuum interrupters and conductive terminals into one piece using epoxy resin. Because the vacuum interrupter is encapsulated in epoxy resin, it is almost unaffected by external contamination and moisture. In addition, epoxy resin not only serves as the main insulation for the interrupter but also as its mechanical support. The electric field distribution is superior to that of traditional assembled poles. At the same time, the number of structural parts is reduced, and the reliability of the conductive circuit is increased, leading to its increasingly widespread application.

[0003] Solid-sealed electrode process: First, a layer of silicone rubber is vulcanized on the surface of the vacuum interrupter. Then, the interrupter and conductive components are assembled and placed in a mold where epoxy resin is poured and cured. The silicone rubber buffer layer between the interrupter and the epoxy resin must retain a certain internal force to ensure that the silicone rubber is tightly held by the epoxy resin, so that the interface between the silicone rubber and the epoxy resin can reliably withstand the insulation requirements of the vacuum interrupter's break.

[0004] Currently, most solid-sealed electrodes are prone to air gaps when manufacturing processes are not well controlled. These air gaps cause uneven electric fields in different areas, resulting in localized drops in electrical strength within the insulation below the electric field strength, leading to localized breakdown. Simultaneously, epoxy resin material can easily flow into the contact surface between the arc-extinguishing chamber and the conductive terminal, further reducing the current conductivity between them. Therefore, further improvements are necessary. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a solid-sealed pole that is simple in structure, easy to use, and can effectively reduce air gaps and can be used in air cabinets.

[0006] The objective of this invention is achieved in the following manner: A solid-sealed pole includes a cured insulating shell, an arc-extinguishing chamber with silicone rubber, and a conductive terminal; the conductive terminal, which is fastened to the arc-extinguishing chamber, is located at the lower end of the insulating shell; the conductive terminal has a groove, an inner boss is formed on one side of the inner wall of the groove, and an outer boss is formed on one side of the outer wall of the groove, the outer boss is higher than the inner boss, the end face of the inner boss contacts the end face of the stationary conductive rod of the arc-extinguishing chamber, and the outer boss compresses the silicone rubber on the arc-extinguishing chamber; the inner wall of the insulating shell has an inner flange, which extends to the silicone rubber flat surface of the moving end cover plate of the arc-extinguishing chamber, so that the cured insulating shell can fasten the arc-extinguishing chamber.

[0007] Preferably, there is an air gap of 1.5-2mm between the silicone rubber and the conductive rod on the arc-extinguishing chamber. The small air gap in this part is eliminated by increasing the air gap between the silicone rubber and the conductive rod.

[0008] Preferably, the conductive terminal is further provided with a vent hole, which extends from the groove to the other side of the conductive terminal; after the arc-extinguishing chamber and the conductive terminal are fastened, there will be a cavity structure, and the heat generated in the cavity structure when the sealed pole is energized can be discharged through the vent hole.

[0009] Preferably, the outer diameter of the outer boss is smaller than the outer edge dimension of the stationary end cover plate of the arc-extinguishing chamber.

[0010] Preferably, the area of ​​the inner boss end face is larger than that of the static conductive rod end face of the arc-extinguishing chamber, so that the static conductive rod end face of the arc-extinguishing chamber is in complete contact with the inner boss end face of the conductive terminal, ensuring its current conduction performance.

[0011] Preferably, the conductive terminal is provided with an anti-detachment groove to prevent the cured insulating shell from falling off.

[0012] The beneficial effects of this invention are: 1. Simple structure, low production cost, and improved market competitiveness. 2. The outer protrusion of the conductive terminal tightly presses against the silicone rubber, effectively preventing epoxy resin from flowing into the overlapping surface between the static guide rod of the arc-extinguishing chamber and the conductive terminal during casting and curing; moreover, after curing, under the pressure of the outer protrusion, inner flange, and insulating shell, the silicone rubber is tightly held by the insulating shell, eliminating air gaps. 3. After the arc-extinguishing chamber and conductive terminal are fastened, a cavity structure exists, and the heat generated in the cavity structure when the sealed electrode is energized can be discharged through the vent. 4. The product of this invention can operate safely in dry air, expanding its applicability. Attached Figure Description

[0013] Figure 1 This is a cross-sectional diagram of a solid-sealed pole.

[0014] Figure 2 This is a cross-sectional diagram of a conductive terminal.

[0015] Figure 3 This is a magnified schematic diagram of partial discharge at the stationary end of the arc-extinguishing chamber.

[0016] Figure 4 This is an enlarged schematic diagram of partial discharge at the moving end of the arc-extinguishing chamber.

[0017] Wherein: 1-Insulating shell, 11-Inner flange, 2-Arc extinguishing chamber, 3-Conductive terminal, 31-Groove, 32-Outer boss, 33-Inner boss, 34-Ventilation hole, 35-Anti-detachment groove, 4-Silicone rubber. Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings. The solid-sealed pole includes a cured insulating shell 1, an arc-extinguishing chamber 2 with silicone rubber 4, and a conductive terminal 3; the conductive terminal 3, which is fastened to the arc-extinguishing chamber 2, is located at the lower end of the insulating shell 1; The conductive terminal 3 is cylindrical and has a groove 31. An inner boss 33 is formed on one side of the inner wall of the groove 31, and an outer boss 32 is formed on one side of the outer wall of the groove 31. The outer boss 32 is 1.5mm higher than the inner boss 33. The conductive terminal 3 is fastened to the arc-extinguishing chamber 2 through the mounting hole in the middle. The end face of the inner boss 33 is in contact with the end face of the stationary conductive rod of the arc-extinguishing chamber 2. The outer boss 32 compresses the silicone rubber 4 on the arc-extinguishing chamber 2. The inner wall of the insulating shell 1 is provided with an inner flange 11, which extends to the flat surface of the silicone rubber 4 on the moving end cover of the arc-extinguishing chamber 2, so that the insulating shell 1 after curing can secure the arc-extinguishing chamber 2.

[0019] There is a 2mm air gap between the silicone rubber 4 and the conductive rod on the arc-extinguishing chamber 2.

[0020] The conductive terminal 3 is also provided with a vent hole 34, which extends from the groove 31 to the other side of the conductive terminal 3. After the arc-extinguishing chamber 2 and the conductive terminal 3 are fastened, there will be a cavity structure in the groove 31. When the solidified pole is energized, the heat generated in the cavity structure can be discharged through the vent hole 34.

[0021] The outer diameter of the external protrusion 32 is smaller than the outer edge dimension of the stationary end cover plate of the arc extinguishing chamber 2.

[0022] The end face area of ​​the inner boss 33 is larger than the end face of the static conductive rod of the arc-extinguishing chamber 2, and the end face of the static conductive rod of the arc-extinguishing chamber 2 is in complete contact with the end face of the inner boss 33 of the conductive terminal 3.

[0023] The conductive terminal 3 has two anti-detachment grooves 35 in the middle to prevent the cured insulating shell 1 from falling off. At the same time, the conductive terminal 3 between the two anti-detachment grooves 35 is knurled to increase the friction between the conductive terminal and the insulating shell and prevent the conductive terminal from rotating.

[0024] Compared to traditional technologies, the conductive terminal's outer protrusion tightly presses against the silicone rubber, effectively preventing epoxy resin from flowing into the overlap surface between the arc-extinguishing chamber's stationary guide rod and the conductive terminal during casting and curing. Furthermore, after curing, the silicone rubber is tightly held by the insulating shell under the pressure of the outer protrusion, inner flange, and insulating shell, eliminating air gaps. Simultaneously, the arc-extinguishing chamber and conductive terminal, once firmly secured, create a cavity structure. The heat generated within this cavity structure during energized operation of the sealed electrode can be dissipated through the vent holes, increasing the equipment's heat dissipation capacity and enabling the product to operate efficiently and stably for extended periods. Additionally, the product's ability to operate safely in dry air expands its applicability, allowing for widespread adoption.

[0025] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this invention.

Claims

1. A solid-sealed electrode for an air cabinet, characterized in that: It includes a cured insulating shell (1), an arc-extinguishing chamber (2) with silicone rubber (4) and a conductive terminal (3); the conductive terminal (3) fastened to the arc-extinguishing chamber (2) is located at the lower end of the insulating shell (1); The conductive terminal (3) is provided with a groove (31), an inner boss (33) is formed on one side of the inner wall of the groove (31), and an outer boss (32) is formed on one side of the outer wall of the groove (31). The outer boss (32) is higher than the inner boss (33). The end face of the inner boss (33) is in contact with the end face of the static conductive rod of the arc-extinguishing chamber (2). The outer boss (32) squeezes the silicone rubber (4) on the arc-extinguishing chamber (2). The inner wall of the insulating shell (1) is provided with an inner flange (11). The inner flange (11) extends to the flat surface of the silicone rubber (4) of the moving end cover of the arc-extinguishing chamber (2) so that the cured insulating shell (1) secures the arc-extinguishing chamber (2). There is an air gap of 1.5~2mm between the silicone rubber (4) and the conductive rod on the arc-extinguishing chamber (2); the conductive terminal (3) is also provided with a vent hole (34). The vent (34) extends from the groove (31) to the other side of the conductive terminal (3); The outer diameter of the external boss (32) is smaller than the outer edge of the static end cover plate of the arc-extinguishing chamber (2); The end face area of ​​the inner boss (33) is larger than the end face of the static conductive rod of the arc-extinguishing chamber (2).

2. The solid-sealed pole for an air cabinet according to claim 1, characterized in that: The conductive terminal (3) is provided with an anti-detachment groove (35).

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