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Arc extinguish chamber for low-voltage circuit breaker

A low-voltage circuit breaker and arc extinguishing chamber technology, which is applied in the field of arc extinguishing chambers, can solve problems such as low speed, reduced arc extinguishing performance of the arc extinguishing chamber, and poor gas circulation in the arc extinguishing chamber, so as to achieve long service life, improve magnetic field distribution, The effect of shortening the arcing time

Pending Publication Date: 2022-03-04
SHANGHAI RENMIN ELECTRICAL APP WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After adopting the arc extinguishing chamber with this structure, the short-circuit breaking capacity of the circuit breaker is increased from the original 80kA to 120kA. Arc chamber arc extinguishing performance

Method used

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  • Arc extinguish chamber for low-voltage circuit breaker
  • Arc extinguish chamber for low-voltage circuit breaker
  • Arc extinguish chamber for low-voltage circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as Figure 1~2As shown, an arc extinguishing chamber for a low-voltage circuit breaker includes an arc extinguishing grid set 15, an arc striker 3, a side plate 5, a base 4, a flame extinguishing plate 16 and a top cover 13, and the arc extinguishing grid set 15 is composed of upper arc extinguishing grid group 1 and lower arc extinguishing grid group 2 parallel to each other. The lower arc extinguishing grid group 2 is close to the static contact area, that is, the arc generation area, and the upper arc extinguishing grid group 1 is set on the lower arc extinguishing grid group. Above the grid group 2, the included angle between the pins of the lower arc-extinguishing grid group 2 and the horizontal direction is 35-50°.

[0033] Such as figure 1 As shown, the lower arc extinguishing grid set 2 has a larger area and a smaller distance from the contact area than the upper arc extinguishing grid set 1, wherein the area of ​​each grid in the lower arc extinguishing g...

Embodiment 2

[0045] An arc extinguishing chamber for a low-voltage circuit breaker, comprising an arc extinguishing grid set 15, an arc striker 3, a side plate 5, a base 4, a flame extinguishing plate 16 and a top cover 13, and the arc extinguishing grid set 15 consists of mutual The parallel upper arc extinguishing grid group 1 and the lower arc extinguishing grid group 2 are composed, the lower arc extinguishing grid group 2 is close to the static contact area, that is, the arc generation area, and the upper arc extinguishing grid group 1 is set on the lower arc extinguishing grid group Above 2, the included angle between the pins of the lower arc extinguishing grid set 2 and the horizontal direction is 35-50°.

[0046] The lower arc extinguishing grid group 2 has a larger area and a smaller distance from the contact area than the upper arc extinguishing grid group 1, wherein the area of ​​each grid in the lower arc extinguishing grid group 2 is larger than that of the upper arc extinguis...

Embodiment 3

[0058] An arc extinguishing chamber for a low-voltage circuit breaker, comprising an arc extinguishing grid set 15, an arc striker 3, a side plate 5, a base 4, a flame extinguishing plate 16 and a top cover 13, and the arc extinguishing grid set 15 consists of mutual The parallel upper arc extinguishing grid group 1 and the lower arc extinguishing grid group 2 are composed, the lower arc extinguishing grid group 2 is close to the static contact area, that is, the arc generation area, and the upper arc extinguishing grid group 1 is set on the lower arc extinguishing grid group Above 2, the included angle between the pins of the lower arc extinguishing grid set 2 and the horizontal direction is 35-50°.

[0059] The lower arc extinguishing grid group 2 has a larger area and a smaller distance from the contact area than the upper arc extinguishing grid group 1, wherein the area of ​​each grid in the lower arc extinguishing grid group 2 is larger than that of the upper arc extinguis...

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Abstract

The invention relates to an arc extinguish chamber for a low-voltage circuit breaker, the arc extinguish chamber comprises an arc extinguish grid group (15), an arc striking sheet (3), a side plate (5), a base (4), a flame extinguish sheet (16) and a top cover (13), the arc extinguish grid group (15) is composed of an upper arc extinguish grid group (1) and a lower arc extinguish grid group (2) which are parallel to each other, and the lower arc extinguish grid group (2) is close to a static contact area, namely an arc generation area. The upper arc-extinguishing grid plate group (1) is arranged above the lower arc-extinguishing grid plate group (2), and an included angle between a pin of the lower arc-extinguishing grid plate group (2) and the horizontal direction is 35-50 degrees; the area of the lower arc-extinguishing grid sheet group (2) is larger than that of the upper arc-extinguishing grid sheet group (1), the distance between the lower arc-extinguishing grid sheet group (2) and a contact area is smaller, and the area of each grid sheet in the lower arc-extinguishing grid sheet group (2) is larger than that of each grid sheet in the upper arc-extinguishing grid sheet group (1) by 2-3 cm < 2 >. Compared with the prior art, the invention has the advantages of excellent arc extinguishing performance, long service life, high breaking capacity and the like.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing chamber for a low-voltage circuit breaker. Background technique [0002] The low-voltage circuit breaker is an important protective device used to connect and break the line in the low-voltage power distribution system. It can automatically disconnect the line when the line is overloaded or short-circuited to protect the line and the load from damage. When the low-voltage circuit breaker breaks the fault current, an arc will be generated between the contacts of the electrical appliance. The arc is a high-temperature free gas, which will cause great damage to the contacts of the circuit breaker. If the arc is not extinguished in time, it may It will cause damage to the circuit breaker, and more seriously, it will cause a safety accident. Therefore, the existing circuit breakers are equipped with an arc extinguishing chamber, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H73/18
CPCH01H73/18
Inventor 叶心凌眭皓徐琛君卢春荣
Owner SHANGHAI RENMIN ELECTRICAL APP WORKS
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