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Low voltage circuit breaker and its arc extinguishing chamber

A low-voltage circuit breaker and arc extinguishing chamber technology, which is applied to circuit breaker components, circuits, electrical components, etc., can solve the problem that the structure of the arc extinguishing chamber cannot provide higher arc voltage, the effective length of the grid is limited, and the lack of gas cooling effect and other problems, to avoid rapid drop and fall, to facilitate rapid extinguishment, and to enhance the effect of gas arc extinguishing

Active Publication Date: 2020-08-04
TIANJIN JINGREN ELECTRIC APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the moving and static contacts in the prior art are all located in the center of the arc extinguishing chamber, and because there are narrow slits in the grid, the arc movement area will be concentrated in the middle of the arc extinguishing chamber and near the narrow slit, so the arc has a great impact on the gas generating plate. The burning is limited, especially, the burning of the arc on both sides of the grid is relatively small, and the area of ​​the entire grid is less than 50%. At the same time, limited by the size of the switch, the effective length of the grid is also limited, resulting in the arc from After entering the narrow slit of the grid, it will continue to move forward and run out from the back of the grid, and be connected in series on the back, so that the number of arcs divided by the grid is reduced, the arc voltage is greatly reduced, and the extinguishing of the arc is extremely effective. Unfavorable, moreover, once the arc enters the grid, it is completely cooled by the grid, which lacks the gas cooling effect and is prone to arc reignition
[0007] With the development of electric power, the operating voltage of the power system continues to increase. The AC voltage is as high as 1200V and the DC voltage is as high as 1500V. However, the structure of the arc extinguishing chamber in the prior art cannot provide a higher arc voltage. , it is necessary to develop a circuit breaker arc extinguishing chamber that can provide higher arc voltage, rapid cooling and arc extinguishing

Method used

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  • Low voltage circuit breaker and its arc extinguishing chamber
  • Low voltage circuit breaker and its arc extinguishing chamber
  • Low voltage circuit breaker and its arc extinguishing chamber

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Embodiment approach 1

[0074] Such as Figure 5 to Figure 29 As shown, the present invention provides an arc extinguishing chamber of a low-voltage circuit breaker, wherein the front of the arc extinguishing chamber is opposite to the moving contact, the rear of the arc extinguishing chamber is an arc outlet, and the arc extinguishing chamber of the low-voltage circuit breaker The arc extinguishing chamber includes at least two arc extinguishing grids 2 stacked up and down and at least one insulating block 1 capable of blocking arcs. Both sides of the arc extinguishing grid 2 are fixed by insulating brackets 4, and the insulating block 1 is set At the rear of the arc extinguishing chamber, the insulating block 1 is interlocked with the arc extinguishing grid 2 .

[0075] The arc extinguishing chamber of the low-voltage circuit breaker of the present invention also includes an arc striker 3, which is located above the arc extinguishing grid 2, and both sides of the arc striker 3 pass through the insu...

Embodiment approach 2

[0092] The present invention also provides a low-voltage circuit breaker, wherein the low-voltage circuit breaker includes the arc extinguishing chamber of the low-voltage circuit breaker described in the first embodiment, and the structure, working principle and beneficial effect of the arc extinguishing chamber are the same as those in the first embodiment , which will not be repeated here.

[0093] When the low-voltage circuit breaker and its arc extinguishing chamber of the present invention work, such as Figure 15 and Figure 16 As shown, when an arc is generated, the arc enters the arc extinguishing grid 2 of the arc extinguishing chamber under the action of the magnetic field and air blowing and moves from front to back, wherein the concentrated area of ​​the arc enters through the narrow gap in the middle of the arc extinguishing grid 2 The arc extinguishing grid 2 and the insulating block 1 block the arc, so that the arc moves to both sides of the arc extinguishing ...

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Abstract

The invention provides an arc extinguishing chamber of a low-voltage circuit breaker. The front portion of the arc extinguishing chamber is opposite to a movable contact. The rear portion of the arc extinguishing chamber is an arc outlet. The arc extinguishing chamber of the low-voltage circuit breaker comprises at least two arc chutes stacked up and down and at least one insulating block capableof blocking the arc. Both sides of the each arc chute are fixed by insulating brackets. The insulating block is arranged at the rear portion of the arc extinguishing chamber. The insulating block andthe arc chutes are clamped. The present invention also provides a low-voltage circuit breaker comprising the arc extinguishing chamber of the low-voltage circuit breaker. The arc is rapidly cooled andextinguished by the insulating block and is prevented from burning up again.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to a low-voltage circuit breaker and an arc extinguishing chamber thereof. Background technique [0002] The low-voltage circuit breaker is mainly composed of the shell, the contact system, the arc extinguishing system and the operating mechanism, etc. Among them, the arc extinguishing chamber of the arc extinguishing system is a very important functional part of the low-voltage circuit breaker, and its performance has a great impact on the short-circuit condition of the low-voltage circuit breaker. Reliable breaking down plays a decisive role. [0003] The arc extinguishing grid type arc extinguishing chamber structure adopted by the existing low-voltage circuit breaker is composed of an arc extinguishing grid and partitions fixed on both sides of the arc extinguishing grid. The arc extinguishing grid is a metal grid and the partition is an insulating mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H73/18H01H9/34
Inventor 刘万里南寅吴来顺王喜成
Owner TIANJIN JINGREN ELECTRIC APPLIANCE CO LTD
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