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Wall bushing

A technology of wall-piercing bushings and conductive rods, applied in the direction of electrical components, etc., can solve the problems of unguaranteed long-term reliability of dynamic seals, high price of bellows, limited flow capacity, etc.

Pending Publication Date: 2021-02-02
JIANGSU SHENMA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the head components of the existing wall-piercing bushings are corrugated tubes, the conductive rod and the corrugated tube are connected in an axial seal, and the conductive rod passes through the corrugated tube to be directly electrically connected to the external parts. Specifically, the conductive rod One end is fixed with the end of the wall bushing, the other end of the conductive rod is fixed with the corrugated tube and extends out of the corrugated tube for electrical connection with external components. The elastic corrugated tube provides tension to the conductive rod to maintain The tension of the conductive rod, when the conductive rod is heated and elongated, the bellows can be elastically deformed, so that the conductive rod remains straight without stress bending, but there are the following problems: the head assembly of the wall bushing adopts For the bellows, if the axial seal is used, due to the long-term frictional effect of thermal expansion and contraction, the long-term reliability of the dynamic seal cannot be guaranteed, and the product is prone to air leakage; if the axial seal is not used, an external transition tank needs to be installed, wiring A soft connection is required between the terminal and the conductive rod, and the flow capacity is limited; the price of the bellows itself is high, which increases the manufacturing cost of the product; metal chips are easily generated between the conductive rod and the head assembly due to friction, resulting in internal discharge

Method used

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, the present embodiment provides a wall bushing 100, including a head assembly 110, a conductive rod 120, and a connecting terminal 140 (only schematically shown in the figure) that seals the head assembly 110 and the conductive rod 120. 140 is electrically connected with the conductive rod 120, and the head assembly 110 includes a transition tank 111 and a transition plate 112 connected to each other; the upper end of the transition tank 111 is provided with a first through hole 1111, and the lower end of the transition tank 111 passes through; the transition plate 112 The second through hole 1121 is provided, the conductive rod 120 passes through the first through hole 1111 and the second through hole 1121 , the transition tank 111 and the transition plate 112 are fixedly connected so that the transition tank 111 surrounds the conductive rod 120 to form an accommodation chamber 113 . The wall bushing 100 has a simple structure, and the core c...

Embodiment 2

[0038] Such as figure 2 As shown, this embodiment provides a wall bushing 200 , the difference from Embodiment 1 is that the structure of the transition plate 212 is different.

[0039] In this embodiment, the lower surface 2122 of the transition plate 212 is provided with a protruding ring 2123 surrounding the second through hole 2121 . The provision of the protruding ring 2123 increases the supporting area of ​​the conductive rod 220 and can improve the bending resistance of the conductive rod 220 .

[0040] In other embodiments, the protruding ring can also be arranged on the upper surface of the transition plate, or both the upper surface and the lower surface are provided with a protruding ring, the essence is to expand the contact area between the conductive rod and the transition plate, and improve the bending resistance of the conductive rod .

[0041] The wall-piercing bushing 200 of this embodiment can improve the bending resistance of the conductive rod 220 due t...

Embodiment 3

[0043] Such as image 3 As shown, this embodiment provides a wall-piercing bushing 300 , which differs from the second embodiment in that a non-metallic lining 330 is added.

[0044] In this embodiment, the inner wall of the first through hole 3111 and the inner wall of the second through hole 3121 are provided with a non-metallic lining 330 to avoid friction between the conductive rod 330 and the transition plate 312 and the transition tank 311 to produce metal particles, and improve product operation. reliability.

[0045] In other embodiments, a non-metal lining may also be provided only on the inner wall of the first through hole or inside the second through hole.

[0046] In this embodiment, the inner wall of the protruding ring 3123 is also provided with a non-metal lining 330 . In other embodiments, the non-metallic lining can be arranged continuously in the area where the conductive rod contacts other metal conductors, or it can be arranged in sections so that there ...

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PUM

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Abstract

The invention discloses a wall bushing, which comprises a head assembly, a conducting rod and a wiring terminal hermetically covering the head assembly and the conducting rod, wherein the wiring terminal is electrically connected with the conducting rod, and the head assembly comprises a transition tank and a transition plate which are connected with each other; a first through hole is formed in the upper end of the transition tank, and the lower end of the transition tank is through. The transition plate is provided with a second through hole, the conducting rod penetrates through the first through hole and the second through hole, the transition tank and the transition plate are fixedly connected to enable the interior of the transition tank to surround the conducting rod to form a containing cavity. The wall bushing is simple in structure, a corrugated pipe structure is omitted, an axial dynamic sealing device can be prevented from being adopted, and the product sealing reliabilityis greatly improved. Meanwhile, the production cost can be reduced.

Description

technical field [0001] The present application relates to the technical field of power transmission insulation equipment, in particular to a wall-piercing bushing. Background technique [0002] In DC power transmission and transformation projects, the wall bushing, as the only electrical component connecting the inside and outside of the valve hall, carries the full voltage and current of the entire line, and its performance reliability is related to the operation safety and stability of the entire line. [0003] At present, most of the head components of the existing wall-piercing bushings are corrugated tubes, the conductive rod and the corrugated tube are connected in an axial seal, and the conductive rod passes through the corrugated tube to be directly electrically connected to the external parts. Specifically, the conductive rod One end is fixed with the end of the wall bushing, the other end of the conductive rod is fixed with the corrugated tube and extends out of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G3/22H02G3/04
CPCH02G3/22H02G3/0481H02G3/0487H01B17/303
Inventor 黄从鹏刘超马斌
Owner JIANGSU SHENMA ELECTRIC CO LTD