CN111834178A - Arc extinguishing system of a circuit breaker - Google Patents

Abstract

The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing system of a circuit breaker, which comprises: the arc extinguishing device comprises a fixed contact, an arc isolating plate is clamped between two contacts of the fixed contact, an arc striking plate penetrates through the arc isolating plate, arc extinguishing chambers are arranged on the arc isolating plate, arc extinguishing grid pieces are fixedly arranged in the arc extinguishing chambers, arc extinguishing plates are arranged on the arc extinguishing grid pieces, and moving contacts corresponding to the fixed contact are movably arranged on one side of the fixed contact close to the contacts.

Description

Arc extinguishing system of a circuit breaker

technical field

The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing system for circuit breakers.

Background technique

The current circuit breaker generally includes arc extinguishing device, tripping device, contact system and operating mechanism. When the dynamic and static contacts of the circuit breaker are separated, an arc will be generated. Because the moving path of the contact arm of the movable contact is in the arc extinguishing In the cavity of the grid, the arc will enter the arc extinguishing chamber during the generation process, and the arc will be introduced between the grids through the arc extinguishing grid, and the arc will be cut into short arcs in series, making the arc thinner and faster. Increase the arc voltage drop, so as to achieve the effect of arc extinguishing;

The arc-extinguishing system of the existing circuit breaker is usually an arc-extinguishing chamber. Usually, arc-extinguishing grids are placed at intervals in the arc-extinguishing chamber to increase the arc-extinguishing effect. Therefore, we propose a circuit breaker arc extinguishing system to solve the above drawbacks well.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an arc extinguishing system for a circuit breaker to solve the problems raised in the above background art.

The above-mentioned purpose of the present invention is achieved through the following technical solutions:

An arc extinguishing system of a circuit breaker, comprising: a static contact, an arc isolation plate is sandwiched between two contacts of the static contact, an arc striking plate is arranged through the arc isolation plate, and the arc isolation plate An arc-extinguishing chamber is arranged on the plate, an arc-extinguishing grid is fixed in the arc-extinguishing chamber, an arc-extinguishing plate is arranged on the arc-extinguishing grid, and the side of the static contact close to the contact is movably provided with a corresponding Set moving contacts.

Further, the arc-extinguishing grid is composed of several pieces, and the several arc-extinguishing grids are evenly distributed in the arc-extinguishing chamber, and the arc-extinguishing grid is integrally formed with a plurality of protrusions on the side away from the arc isolation plate. Several of the protrusions are inserted through the arc-extinguishing plate, and the several arc-extinguishing grids are distributed at equal distances.

Further, the arc extinguishing grid sheet is made of magnetic steel sheet.

Further, there are two arc extinguishing chambers, the two arc extinguishing chambers are symmetrically distributed on both sides of the arc partition plate, and one side of the two arc extinguishing chambers is communicated through the arc striking plate.

Further, the two arc extinguishing chambers are distributed on both sides of the arc baffle in an up-and-down manner.

Further, the arc striking plate is disposed on the side of the arc blocking plate away from the contact point of the stationary contact, and the contact point of the moving contact is located between the arc striking plate and the stationary contact.

Compared with the prior art, the present invention provides an arc extinguishing system for a circuit breaker, which has the following beneficial effects:

1. According to the present invention, after the moving contact is opened, two arcs are generated between the moving contact and the static contact, and the two arcs are respectively introduced into two arc extinguishing chambers under the action of the arc extinguishing grid. As a medium for connecting two arcs in series, the arc length of the entire arc extinguishing system is maximized; and the arc clapboard is used to isolate the two arc extinguishing chambers;

2. In the present invention, by arranging the two arc extinguishing chambers on the arc baffle in a superimposed manner, the width and space of the arc extinguishing system can be reduced, and at the same time, the line will generate two arcs and corresponding arcs. Two arc extinguishing chambers can extinguish the arc faster than the traditional single arc extinguishing chamber.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the present invention;

FIG. 2 is a schematic diagram of the rear structure of the present invention.

In the figure: 1-static contact; 2-arc barrier; 3-arc strike plate; 4-arc extinguishing chamber; 5-arc extinguishing grid; 6-arc extinguishing plate; 7-moving contact; 8-protrusion .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example: Please refer to Figures 1 to 2, the present invention provides a technical solution: an arc extinguishing system for a circuit breaker, comprising: a static contact 1, and an arc isolation plate is sandwiched between the two contacts of the static contact 1 2. Arc-striking plate 3 is arranged on arc-cutting plate 2, arc-extinguishing chamber 4 is arranged on arc-cutting plate 2, arc-quenching grid 5 is fixedly arranged in arc-quenching chamber 4, and arc-quenching grid 5 is provided with extinguishing The arc plate 6, the side of the static contact 1 close to the contact is movably provided with a corresponding movable contact 7, the arc-extinguishing grid 5 is a number of pieces, and the several arc-extinguishing grids 5 are evenly distributed in the arc-extinguishing chamber 4 Inside, the side of the arc-extinguishing grid sheet away from the arc-extinguishing plate 2 is integrally formed with a plurality of protrusions 8, and the plurality of protrusions 8 are inserted through the arc-quenching plate 6, and the arc-extinguishing grid sheets 5, etc. The distance is distributed, the arc-extinguishing grid 5 is made of magnetic steel sheet, the arc-striking plate 3 is arranged on the side of the arc-striking plate 6 away from the contact point of the static contact 1, and the contact point of the moving contact 7 is located on the arc-striking plate 3 and Between the static contacts, after the moving contact 7 is opened, two arcs are generated between the moving contact 7 and the static contact 1, and the two arcs are introduced into two arc extinguishing under the action of the arc extinguishing grid 5 respectively. In the chamber 4 , the arc striking plate 3 serves as a medium for connecting two arcs in series, so as to maximize the length of the arc generated in the entire arc extinguishing system;

Among them, there are two arc extinguishing chambers 4, the two arc extinguishing chambers 4 are symmetrically distributed on both sides of the arc partition plate 6, and one side of the two arc extinguishing chambers 4 is communicated through the arc striking plate 3, and the two arc extinguishing chambers 4 adopt upper and lower arc extinguishing chambers. The two sides of the arc-extinguishing board 6 are distributed in a superimposed manner. By arranging the two arc-extinguishing chambers 4 on the arc-extinguishing board 2 in a superimposed manner, the width and space of the arc-extinguishing system can be reduced, and at the same time, the circuit will Two arcs and the corresponding two arc extinguishing chambers 4 are generated, which can extinguish the arc faster than the traditional single arc extinguishing chamber 4 .

Working principle: During the use of the present invention, after the movable contact 7 is opened, two arcs are generated between the movable contact 7 and the static contact 1, and the two arcs are respectively introduced under the action of the arc extinguishing grid 5. In the two arc extinguishing chambers 4, the arc striking plate 3 is used as a medium for connecting two arcs in series, so as to maximize the length of the arc generated in the entire arc extinguishing system; The two arc extinguishing chambers 4 are arranged on the arc partition plate 2 in a superimposed manner, so that the width and space arrangement of the arc extinguishing system can be reduced, and at the same time, the line will generate two arcs and two corresponding arc extinguishing Compared with the traditional single arc extinguishing chamber 4, the arc can be extinguished faster.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or device that includes the element.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. An arc extinguishing system of a circuit breaker, comprising: static contact (1), its characterized in that: the arc-extinguishing plate is characterized in that an arc-isolating plate (2) is clamped between two contacts of the static contact (1), an arc striking plate (3) penetrates through the arc-isolating plate (2), an arc-extinguishing chamber (4) is arranged on the arc-isolating plate (2), an arc-extinguishing grid piece (5) is fixedly arranged in the arc-extinguishing chamber (4), an arc-extinguishing plate (6) is arranged on the arc-extinguishing grid piece (5), and a moving contact (7) which is arranged correspondingly to the static contact is movably arranged on one side, close to the contacts, of the static contact (1).

2. The arc extinguishing system of a circuit breaker according to claim 1, wherein: arc extinguishing bars piece (5) are a plurality of, and a plurality of arc extinguishing bars piece (5) evenly distributed is in explosion chamber (4), one side integrated into one piece that arc extinguishing bars piece kept away from flash barrier (2) is provided with a plurality of arch (8), a plurality of arch (8) run through and peg graft on arc extinguishing plate (6), and the equidistance distributes between a plurality of arc extinguishing bars piece (5).

3. The arc extinguishing system of a circuit breaker according to claim 1, wherein: the arc extinguishing grid plate (5) is made of magnetic steel sheets.

4. The arc extinguishing system of a circuit breaker according to claim 1, wherein: the arc extinguishing chambers (4) are two, two the arc extinguishing chambers (4) are symmetrically distributed on two sides of the arc isolating plate (6), and one sides of the two arc extinguishing chambers (4) are communicated through the arc striking plates (3).

5. The arc extinguishing system of a circuit breaker according to claim 1, wherein: two arc extinguish chambers (4) adopt the mode of upper and lower stack to distribute the both sides of flash barrier (6).

6. The arc extinguishing system of a circuit breaker according to claim 1, wherein: the arc striking plate (3) is arranged on one side, away from the contact of the static contact (1), of the arc isolating plate (6), and the contact of the moving contact (7) is located between the arc striking plate (3) and the static contact.

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