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Arc chute, arc chute and circuit breaker

An arc-extinguishing grid and arc-extinguishing chamber technology, which is applied to circuits, electrical components, electrical switches, etc., can solve the problems of increasing arc extinguishing and the difficulty of successfully extinguishing arcs in the arc-extinguishing chamber, and achieves increased deployment length, improved structural strength and Heat capacity, mass increase effect

Active Publication Date: 2020-12-18
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the commonly used flat metal arc extinguishing grid arc extinguishing chamber, after the arc enters the arc extinguishing grid and is divided into many short arcs, the movement of each short arc between the arc extinguishing grids cannot be exactly the same, resulting in the The position between the gratings has front and back, such as figure 2 As shown, the front position in the adjacent short arc will receive the electromotive force F 1 The action continues to move forward, and the position behind receives the electric force F 2 , F 3 function to stop advancing or even retreating, which is beneficial to figure 1 The air cooling between the moving and static contacts has a negative effect, which increases the probability of occurrence of phenomena that are not conducive to arc extinguishing, such as back breakdown and arc re-ignition
The market demand for low-voltage circuit breakers is increasingly miniaturized and the breaking capacity is increasing, which makes it increasingly difficult for arc extinguishing chambers assembled with traditional flat arc extinguishing grids to successfully extinguish the arc.

Method used

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  • Arc chute, arc chute and circuit breaker
  • Arc chute, arc chute and circuit breaker
  • Arc chute, arc chute and circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment one: see Figure 3-Figure 11 As shown, an arc extinguishing grid 1, an arc extinguishing chamber and a circuit breaker:

[0042] see Figure 4 , an arc extinguishing grid 1, an arc extinguishing chamber, and a circuit breaker. The arc extinguishing grid 1 is formed by folding a piece of material in half. Specifically, it has an upper layer part 101 and a lower layer part 102 stacked up and down. The upper layer part There is a gap 103 between 101 and the lower part 102, and, as Image 6 , Figure 7 and Figure 11 As shown, the gap 103 between the upper part 101 and the lower part 102 is embedded with a sheet-shaped insulating member 4, such as flame-retardant cardboard, but not limited to flame-retardant cardboard. The afterbody of the arc grid sheet, the air outlet 104, the installation ear 122, etc. all protrude appropriately from the tail end of the arc extinguishing grid sheet, the air outlet 104, and the installation ear 122 to form the protrusion 41...

Embodiment 2

[0049] Embodiment two: see Figure 12-Figure 15 Shown:

[0050] An arc extinguishing grid 1, an arc extinguishing chamber and a circuit breaker, the difference from Embodiment 1 is that the arc extinguishing chamber further includes an insulating support 5, and the insulating support 5 is arranged on the arc extinguishing grid 1 At one end in another direction perpendicular to the width direction of the arc extinguishing grid 1 , the insulating support 5 provides support for the end of each arc extinguishing grid 1 . Specifically, if Figure 12 and Figure 14 As shown, the insulating support 5 is provided with a slot 51 corresponding to each arc extinguishing grid 1, so that the insulating support 5 presents a comb shape, and the trend of the slot 51 in the width direction of the arc extinguishing grid 1 is similar to that of the arc extinguishing grid. The trend of the surface of 1 is the same, for example, the end of the arc extinguishing grid 1 is flat, the trend of the ...

Embodiment 3

[0053] Embodiment three: see Figure 16-Figure 18 Shown:

[0054] An arc extinguishing grid 1, an arc extinguishing chamber and a circuit breaker, the difference from the second embodiment is that the arc extinguishing grid 1 is not provided with mounting ears 122, and an insulating bracket 6 is used instead of the insulating side plate 2 and the The insulating support 5 is used to support the arc extinguishing grid 1 . Specifically, the insulating bracket 6 is provided with a left support body 61 and a right support body 62 arranged in rows, and the left support body 61 and the right support body 62 are correspondingly arranged on both sides of the arc extinguishing grid sheet 1 in the width direction. Slots 611, 621 are provided on the corresponding edges of each arc extinguishing grid 1 on the body 61 and the right supporting body 62, that is, the left supporting body 61 and the right supporting body 62 both present a comb shape, and the arc extinguishing grid 1 The edges...

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Abstract

The invention relates to an arc chute, an arc extinguishing chamber, and a circuit breaker. The arc chute is a plate body and is characterized in that the plate body of the arc chute is formed by folding one sheet material so that the sheet material has upper and lower portions stacked up and down. A gap is arranged between the upper portion and the lower portion and a plate insulating member is embedded in the gap between the upper portion and the lower portion. The plate insulating member is added to the arc chute so as to reduce the probability that adjacent short arcs are integrated and toprovide support for the further improvement of the miniaturization and breaking capacity of a circuit breaker.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing grid and an arc extinguishing chamber. Background technique [0002] The role of low-voltage circuit breakers in distribution lines is to break and connect circuits. When there is an abnormal fault in the line, such as a short circuit, the contact pair is separated to quickly break the line to avoid equipment damage. As is well known in the industry, when the contacts are separated under current-carrying conditions, an arc will be generated, especially when breaking a short circuit with a large current, the energy of the arc is large, and the ablation of the contacts is serious. Therefore, in low-voltage circuit breakers, usually The arc extinguishing chamber with metal arc extinguishing grid is set to extinguish the arc to ensure the safe operation of electrical equipment. Such as figure 1 As shown, after the arc enters the arc e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/36
CPCH01H9/36H01H2009/365
Inventor 陈会林刘洪武瞿帅强
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)