CN115020163A

CN115020163A - Arc extinguish chamber

Info

Publication number: CN115020163A
Application number: CN202210896995.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Changzhou Ankai Electric Co ltd
Current assignee: Changzhou Ankai Electric Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-09-06

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

Arc extinguish chamber

Technical Field

The invention belongs to the technical field of low-voltage electric appliances, and particularly relates to an arc extinguish chamber.

Background

The arc extinguishing system of the low-voltage circuit breaker is mainly used for extinguishing electric arcs generated by contacts when a circuit is cut off, and the arc extinguishing effect of grid pieces is much stronger than that of direct current, so that most of the existing arc extinguishing systems of alternating-current electric appliances adopt arc extinguishing grid piece structures which are arranged in parallel or in a radial mode, electric arcs generated when dynamic and static contacts are broken are attracted by steel grid pieces with different lengths which are arranged in a crossed mode after being lengthened, and the electric arcs are extinguished under the strong cooling effect of the grid pieces and the short arc effect. As shown in fig. 1 and 2, the arc-extinguishing chamber disclosed in chinese patent publication No. CN212392201U, which has radial grid plates, and the arc-extinguishing chamber disclosed in chinese patent publication No. CN204102752U, which has parallel grid plates, both adopt grid plate arc-extinguishing method to extinguish arc, when the contacts are separated, the generated arc is pushed into the metal grid plate group by the action of electric force and is divided into several segments, each metal grid plate insulated from each other is equivalent to an electrode, and thus there are many cathode and anode voltage drops. For alternating current electric arcs, a dielectric strength of 150V-250V appears at the position near a cathode when the electric arcs cross zero, so that the electric arcs cannot be continuously maintained and extinguished, but the conventional grid plate arc extinguishing method cannot effectively eliminate the electric arcs at the leg parts of the grid plates, and the problem to be solved is urgently needed.

Disclosure of Invention

In view of the above, the present invention provides an arc-extinguishing chamber, which can effectively overcome the above problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an arc extinguish chamber, includes grid 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 group, the rib includes parallel and level portion and rake, the rake with the shank forms the closed angle form slot.

Preferably, 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.

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

Preferably, the height of the flush part is equal to the width of the leg part of the grid group.

Preferably, the narrow slits are gradually enlarged along the rear portion of the group of the grids.

Preferably, the grid sheets of the grid sheet set are distributed in a radial shape.

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

Preferably, 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.

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

Preferably, the first separator and the second separator are nylon PA 66.

The arc extinguishing chamber can enable the electric arc to be elongated and enter the narrow and long sharp-horn-shaped narrow slit of the arc extinguishing chamber under the action of the magnetic field and the electric force formed by the electric arc, the narrow slit can divide the electric arc into a plurality of sections and is in contact with a solid medium, and the electric arc is quickly extinguished, so that the purposes of better cooling the electric arc, improving the arc burning voltage, reducing the burning loss of the electric arc to a grid plate and improving the breaking capacity are achieved, and the quick and effective arc extinguishing is realized.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an arc extinguishing chamber with grid sheets arranged in a radial shape in the prior art.

Fig. 2 is a schematic structural diagram of an arc extinguish chamber with grid pieces arranged in parallel in the prior art.

Fig. 3 is a schematic view of the arc extinguishing chamber of the present invention.

Fig. 4 is another angle structure diagram of the arc extinguish chamber of the invention.

Fig. 5 is a schematic structural view of the assembled state of the partition and the grid according to the present invention.

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

Fig. 7 is a cross-sectional view of an arc chute of the present invention.

Fig. 8 is a schematic structural view of a fixing plate according to the present invention.

Fig. 9 is a schematic diagram of a gate structure according to the present invention.

Detailed Description

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 invention may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

Referring to fig. 3 to 8, the present invention discloses an arc extinguish chamber, which includes a grid set 100, a first fixing plate 200, a second fixing plate 300, a first partition plate 400 and a second partition plate 500, wherein the first fixing plate 200 and the second fixing plate 300 are identical in structure and are symmetrically disposed, the first partition plate 400 and the second partition plate 500 are identical in shape and are symmetrically disposed, the first partition plate 400 and the first fixing plate 200 enclose to form an accommodating cavity, the second partition plate 500 and the second fixing plate 300 enclose to form another accommodating cavity, the grid set 100 includes a plurality of grid pieces, two legs of the grid pieces are respectively disposed in the two accommodating cavities, a gap is disposed between adjacent grid pieces of the grid set 100, and after an arc enters the arc extinguish chamber, the arc extinguish chamber is cooled and cut by the grid set 100, thereby achieving the purpose of arc extinguish.

Specifically, referring to fig. 3 and 9, the grid assembly 100 includes a plurality of grids, and the grids gradually incline from the bottom of the arc extinguish chamber at a certain angle from the horizontal position, and are integrally distributed in a radial shape, and the inclination angle is between 0 and 50 degrees. The grids respectively comprise a leg part 101 and a leg part 102, a clearance groove 103 is formed between the leg part 101 and the leg part 102, the clearance groove 103 is used for providing a moving space of a moving contact of a low-voltage electrical appliance, the root part of the clearance groove 103 can be an inclined plane or a straight plane, and when the root part of the clearance groove 103 is the inclined plane, the inclined planes of adjacent grids are arranged in a staggered mode, so that electric arcs are lengthened to achieve the purpose of better arc extinction. Protruding columnar structures 104 are respectively arranged on two sides of the grid plate, the columnar structures 104 are respectively matched with the through holes 210 on the first fixing plate 200 and the second fixing plate 300, and the columnar structures 104 are clamped in the through holes 210, so that the grid plate group 100 is fixed. Preferably, the gate set 100 is made of a metal material.

It should be noted that, in this embodiment, the grid assembly 100 further includes a grid 110, the grid 110 is an edge-most grid arranged at the top of the arc extinguish chamber, and different from other grids, the grid 110 is not provided with a clearance groove, so that the advantage of this arrangement is that after the movable contact is opened, the generated electric arc is blocked at the grid 110 and enters the arc extinguish chamber, and then is cut and cooled layer by layer in the grid assembly.

Referring to fig. 8, the first fixing plate 200 and the second fixing plate 300 are respectively fixedly connected to the first partition plate 400 and the second partition plate 500 by screws, and the first fixing plate 200 and the second fixing plate 300 are respectively provided with screw holes and via holes 210 matched with the legs of the grid set 100. The first fixing plate 200 and the second fixing plate 300 are made of an insulating gas-generating material, such as melamine.

Referring to fig. 5 to 7, a first separator 400 and a second separator 500 are respectively fixedly connected to the first fixing plate 200 and the second fixing plate 300 by screws, a plurality of raised ribs 410 are disposed on the first separator 400, each rib 410 includes a level portion 411 and an inclined portion 412, the width of the level portion 411 is not less than the width of a leg of the gate stack 100, the inclined portion 412 extends from the top end of the level portion 411 to the edge of the first separator 400, that is, the height of the level portion 411 is greater than the height of the inclined portion 412, and the height of the level portion 411 is equal to the width a of the leg 101 of the gate stack 100. A limiting groove 420 is formed between the adjacent ribs 410, the limiting groove 420 is matched with the leg part 101 of the grid set 100, the leg part 101 is clamped in the limiting groove 420, and the length of the limiting groove 420 is not greater than the length B of the leg part 101. The first separator 400 and the second separator 500 have the same structure, and thus, the description thereof is omitted.

With continued reference to fig. 7, the first separator 400 and the second separator 500 are made of a thermoplastic insulating gas generating material, such as nylon PA 66. Because the inclined portions 412 of the ribs 410 are lower than the leg portions of the grid assembly 100, narrow slits 430 are respectively formed between the leg portions of each grid of the grid assembly 100 and the first and

second separators

400 and 500, the narrow slits 430 are in a sharp angle shape and gradually expand toward the rear portion of the grid assembly 100, and the rear portion of the grid assembly 100 is the side away from the arc inlet. When electric arc gets into behind the explosion chamber, can continue towards the shank of bars group 100 both sides shifts, first fixed plate 200 the second fixed plate 300 first baffle 400 with the gas promotion that produces under the high temperature effect that second baffle 500 received electric arc the electric arc of bars group 100 leg enters into in the slot 430 to continue at slot 430 by the cooling cutting, thereby better cooling electric arc promotes the arcing voltage, and reduces the loss of burning of electric arc to the bars, promotes breaking capacity. The cooled arc is finally discharged from the arc chute in the direction indicated by the arrow. The smaller the angle of the sharp corner is, the longer the narrow gap is, the better the cooling electric arc effect is, namely the better the arc extinguishing effect is

According to the arc extinguish chamber, the protruding ribs are arranged on the first partition plate and the second partition plate, the sharp-angle-shaped narrow gap is formed between the ribs and the arc extinguish grid plate, and an 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 arc burning voltage, reducing the burning loss of the electric arc to the grid plate and improving the breaking capacity are achieved.

As used in this specification and the appended claims, the terms "comprises" and "comprising" are intended to only encompass the explicitly identified steps and elements, which do not constitute an exclusive list, and that a method or apparatus may 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 referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Further, the description of the upper, lower, left, right, etc. used in the present invention is only with respect to the positional relationship of the respective components of the present invention with respect to each other in the drawings.

It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the principles of the present invention should be covered within the scope of the present invention.

Claims

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.