CN115020163A - an arc extinguishing chamber - Google Patents

Abstract

The invention discloses an arc extinguish chamber which is characterized by comprising a grid group, a first fixing plate, a second fixing plate, a first partition plate and a second partition plate, wherein the first fixing plate is fixedly connected with the first partition plate, the second fixing plate is fixedly connected with the second partition plate, a plurality of raised ribs are respectively arranged on the first partition plate and the second partition plate, a limiting groove is formed between every two adjacent ribs, the limiting groove is matched with a leg part of the grid group, each rib comprises a parallel and level part and an inclined part, and the inclined part and the leg part form a sharp-horn-shaped narrow slit. According to the arc extinguish chamber, the sharp-angle-shaped narrow gap is formed between the ribs and the arc extinguish grid pieces, and the electric arc entering the arc extinguish chamber is further cooled and cut in the sharp-angle-shaped narrow gap, so that the purposes of better cooling the electric arc, improving the arcing voltage, reducing the burning loss of the electric arc on the grid pieces and improving the breaking capacity are achieved.

Description

an arc extinguishing chamber

technical field

The invention belongs to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing chamber.

Background technique

The main function of the low-voltage circuit breaker arc extinguishing system is to extinguish the arc generated by the contact when the circuit is cut off. Since the arc extinguishing effect of the grid is much stronger than that of the DC, most of the existing AC arc extinguishing systems are arranged in parallel or The arc-quenching grid structure arranged in a radial pattern, the arc generated when the dynamic and static contacts are disconnected is attracted by the steel grids of different lengths placed crosswise after being elongated. Under the strong cooling effect of the grids and the short arc effect down to go out. As shown in Fig. 1 and Fig. 2, respectively are the arc-extinguishing chambers with the grids in the radial shape disclosed by the Chinese Patent Publication No. CN212392201U and the arc-extinguishing chambers with the grids arranged in parallel in the Chinese Patent Publication No. CN204102752U, respectively, Both use the grid arc extinguishing method to extinguish the arc. When the contacts are separated, the generated arc is pushed into the metal grid group under the action of electrodynamic force and is divided into several sections. Each metal grid is insulated from each other. All are equivalent to one electrode, so there are many cathode and anode voltage drops. For the AC arc, near the cathode, there will be a dielectric strength of 150V ~ 250V when the arc crosses zero, so that the arc cannot continue to be maintained and extinguished, but the conventional grid arc extinguishing method cannot effectively eliminate the grid leg. Arc has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

To sum up, the purpose of the present invention is to provide an arc extinguishing chamber, which can effectively overcome the above problems.

To achieve the above object, the present invention adopts the following technical solutions:

An arc extinguishing chamber, comprising a grid plate group, a first fixing plate, a second fixing plate, a first partition plate and a second partition plate, the first fixing plate and the first partition plate are fixedly connected, and the The second fixed plate is fixedly connected to the second partition plate, a plurality of raised ribs are respectively provided on the first partition plate and the second partition plate, and a limit groove is formed between the adjacent ribs, so The limiting grooves are matched with the legs of the grid group, and the ribs include a flat part and an inclined part, and the inclined part and the legs form a sharp-angle slit.

Preferably, the height of the inclined portion is lower than the height of the flush portion, and gradually extends from the top of the flush portion to the edge of the first partition or the second partition.

Preferably, the length of the limiting groove is not greater than the length of the legs of the grid group.

Preferably, the height of the flush portion is equal to the width of the legs of the grid group.

Preferably, the slits are gradually enlarged along the rear of the grid group.

Preferably, the grid plates of the grid plate group are radially distributed.

Preferably, the inclination angle of the grid is between 0-50 degrees.

Preferably, the first fixing plate and the second fixing plate are insulating gas-generating materials, and the first separator and the second separator are thermoplastic insulating gas-generating materials.

Preferably, the first fixing plate and the second fixing plate are melamine plates.

Preferably, the first separator and the second separator are nylon PA66.

In the arc extinguishing chamber of the present invention, under the action of the magnetic field electromotive force formed by the arc, the arc can be elongated and enter into the narrow, long, sharp-angled slit of the arc extinguishing chamber, and the slit can divide the arc into several The arc is quickly extinguished when it is in contact with the solid medium, so as to better cool the arc, increase the arc voltage, reduce the arc's burning loss to the grid, improve the breaking capacity, and achieve fast and effective arc extinguishing.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, which are of great significance to the art For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of an arc-extinguishing chamber with grids arranged radially in the background art.

FIG. 2 is a schematic structural diagram of an arc-extinguishing chamber with grids arranged in parallel in the background art.

FIG. 3 is a schematic diagram of the structure of the arc extinguishing chamber of the present invention.

FIG. 4 is a schematic structural diagram of another angle of the arc extinguishing chamber of the present invention.

FIG. 5 is a schematic structural diagram of the assembled state of the separator and the grid of the present invention.

FIG. 6 is a schematic diagram of the structure of the separator of the present invention.

FIG. 7 is a sectional view of the arc extinguishing chamber of the present invention.

FIG. 8 is a schematic diagram of the structure of the fixing plate of the present invention.

FIG. 9 is a schematic diagram of the grid structure of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted here that the descriptions of these embodiments are used to help the understanding of the present invention, but do not constitute a limitation of the present invention.

Please refer to FIG. 3 to FIG. 8 , the present invention discloses an arc extinguishing chamber, the arc extinguishing chamber includes a grid plate group 100 , a first fixing plate 200 , a second fixing plate 300 , a first partition plate 400 and a second fixing plate 300 . Two partition plates 500, the first fixed plate 200 and the second fixed plate 300 have the same structure and are symmetrically arranged, the first partition plate 400 and the second partition plate 500 have the same shape and are symmetrically arranged, and the first partition plate 400 and the second partition plate 500 are arranged symmetrically. The plate 400 and the first fixing plate 200 are enclosed to form an accommodating cavity, the second partition plate 500 and the second fixing plate 300 are enclosed to form another accommodating cavity, and the grid plate group 100 includes several grids The two legs of the grid are respectively arranged in the above two accommodating chambers, and a gap is provided between the adjacent grids of the grid group 100. After the arc enters the arc extinguishing chamber, it passes through the grid. The cooling and cutting of the film group 100 can achieve the purpose of arc extinguishing.

Specifically, please refer to FIG. 3 and FIG. 9 , the grid set 100 includes a plurality of grids, the grids are gradually inclined at a certain angle from the horizontal position from the bottom of the arc extinguishing chamber, and the grids are distributed in a radial shape as a whole. , its tilt angle is between 0-50 degrees. The grids respectively include legs 101 and legs 102, and an escape groove 103 is formed between the legs 101 and the leg 102, and the escape groove 103 is used to provide a moving space for the moving contact of the low-voltage electrical appliance, The root of the hollow groove 103 can be an inclined surface or a straight surface. When the root of the hollow groove 103 is a sloped surface, the slopes of adjacent grids are staggered, so that the arc is elongated to achieve better extinguishing. purpose of the arc. Protruding columnar structures 104 are respectively provided on both sides of the grid, and the columnar structures 104 are respectively matched with the via holes 210 on the first fixing plate 200 and the second fixing plate 300 . The structure 104 is clamped in the via hole 210 , so as to realize the fixation of the grid group 100 . Preferably, the grid plate group 100 is made of metal material.

It should be noted that, in this embodiment, the grid group 100 further includes a grid 110, and the grid 110 is the most edge grid arranged on the top of the arc extinguishing chamber. , the grid 110 is not provided with an escape groove. The advantage of this setting is that when the moving contact is opened, the generated arc is blocked at the grid 110 and enters the arc extinguishing chamber, and then enters the arc extinguishing chamber. The grids are cut and cooled layer by layer.

Please refer to FIG. 8 , the first fixing plate 200 and the second fixing plate 300 are respectively connected with the first partition plate 400 and the second partition plate 500 by screws. Screw holes and via holes 210 for matching with the legs of the grid group 100 are respectively provided on the second fixing plate 300 and the second fixing plate 300 . The first fixing plate 200 and the second fixing plate 300 are insulating gas-generating materials, such as melamine plates.

Please refer to FIG. 5 to FIG. 7 , the first partition plate 400 and the second partition plate 500 are respectively connected with the first fixing plate 200 and the second fixing plate 300 by screws. 400 is provided with several protruding ribs 410, the ribs 410 include a flush portion 411 and an inclined portion 412, the width of the flush portion 411 is not less than the width of the legs of the grid group 100, the The inclined portion 412 gradually extends from the top of the flat portion 411 to the edge of the first partition 400 , that is, the height of the flat portion 411 is greater than the height of the inclined portion 412 , and the flat portion 411 The height is equal to the width A of the leg 101 of the grid group 100 . Limiting grooves 420 are formed between adjacent ribs 410 , the limiting grooves 420 are matched with the legs 101 of the grid group 100 , the legs 101 are clamped in the limiting grooves 420 , and the The length of the limiting slot 420 is not greater than the length B of the leg portion 101 . The structures of the first separator 400 and the second separator 500 are the same, and details are not described herein again.

Please continue to refer to FIG. 7 , the first separator 400 and the second separator 500 are thermoplastic insulating gas-generating materials, such as nylon PA66. Because the inclined part 412 of the rib 410 is lower than the leg of the grid group 100, the leg of each grid of the grid group 100 and the first partition 400 and the first partition Narrow slits 430 are respectively formed between the two separators 500 . The narrow slits 430 are sharp-angled and gradually expand toward the rear of the grid group 100 . side of the vent. After the arc enters the arc extinguishing chamber, it will continue to transfer to the legs on both sides of the grid group 100 . The first fixing plate 200 , the second fixing plate 300 , the first partition plate 400 and the The gas generated by the second separator 500 under the action of the high temperature of the arc pushes the arc of the leg of the grid group 100 into the slit 430, and continues to be cooled and cut in the slit 430, so as to better cool the arc, Increase the arc voltage, reduce the arc burning loss to the grid, and improve the breaking capacity. The cooled arc finally exits the arc extinguishing chamber in the direction indicated by the arrow. The smaller the angle of the sharp corner, the longer the slit, and the better the cooling arc effect, that is, the better the arc extinguishing effect.

In the arc-extinguishing chamber of the present invention, by arranging protruding ribs on the first partition plate and the second partition plate, a sharp-angled narrow gap is formed between the ribs and the arc-extinguishing grid, and the The arc of the arc extinguishing chamber is further cooled and cut in the sharp-edged narrow slit, so as to better cool the arc, increase the arc voltage, reduce the arc's burning loss to the grid, and improve the breaking capacity.

As shown in this specification and claims, the terms "comprising" and "comprising" only imply that the clearly identified steps and elements are included, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

It should be noted that, unless otherwise specified, when a feature is called "fixed" or "connected" to another feature, it can be directly fixed or connected to another feature, or it can be indirectly fixed or connected to another feature. on a feature. In addition, the descriptions of upper, lower, left, right, etc. used in the present invention are only relative to the mutual positional relationship of each component of the present invention in the accompanying drawings.

It should be further understood that in the present disclosure, "plurality" refers to two or more, and other quantifiers are similar.

The above-mentioned embodiment is only to illustrate the technical concept and characteristics of the present invention, and is a preferred embodiment, and its purpose is that those who are familiar with the technology can understand the content of the present invention and implement it accordingly, and cannot limit the present invention by this. protected range. All equivalent transformations or modifications made according to the principles of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides an arc extinguish chamber, a serial communication port, including grid piece group, first fixed plate, second fixed plate, first baffle and second baffle, first fixed plate with first baffle fixed connection, the second fixed plate with second baffle fixed connection a baffle with be equipped with a plurality of bellied ribs on the second baffle respectively, form the spacing groove between the adjacent rib, the spacing groove with the shank cooperation of grid piece group, the rib includes parallel and level portion and rake, the rake with the shank forms the closed angle form slot.

2. An arc chute according to claim 1, characterized in that the height of the inclined portion is lower than the height of the flush portion and extends gradually from the top end of the flush portion to the edge of the first or second partition plate.

3. An arc chute according to claim 1 or 2, characterized in that the length of the limiting groove is not greater than the length of the leg of the group of bars.

4. An arc chute according to claim 1 or 2, characterized in that the height of the flush part is equal to the width of the leg of the group of bars.

5. An arc chute according to claim 1, characterized in that said slots are gradually enlarged along the rear part of said group of bars.

6. An arc chute according to claim 1, characterized in that the grid pieces of the grid set are distributed radially.

7. An arc chute according to claim 6, characterized in that the angle of inclination of the grid is between 0 and 50 degrees.

8. The arc extinguish chamber according to claim 1, wherein the first fixing plate and the second fixing plate are made of insulating gas generating materials, and the first partition plate and the second partition plate are made of thermoplastic insulating gas generating materials.

9. An arc chute according to claim 8, characterized in that said first and second fixed plates are melamine plates.

10. The arc chute of claim 8 wherein said first and second spacers are nylon PA 66.

Images