CN222071848U

CN222071848U - Arc extinguishing chamber and miniature circuit breaker thereof

Info

Publication number: CN222071848U
Application number: CN202323369902.6U
Authority: CN
Inventors: 周红兵; 高超; 蔡明阳
Original assignee: Xi'an Zero One Intelligent Electric Appliance Co ltd
Current assignee: Xi'an Zero One Intelligent Electric Appliance Co ltd
Priority date: 2023-12-11
Filing date: 2023-12-11
Publication date: 2024-11-26
Anticipated expiration: 2033-12-11

Abstract

The utility model belongs to the technical field of piezoelectric devices, and discloses an arc-extinguishing chamber and a miniature circuit breaker thereof, wherein the arc-extinguishing chamber comprises a nonpolar magnetic drive arc structure formed by permanent magnets and U-shaped magnetic conduction plates, and a multi-arc-extinguishing chamber structure which is alternately arranged along the axial direction of an arc, and the multi-arc-extinguishing chamber comprises one or more double-insulation narrow-slit arc-extinguishing chambers and metal grid arc-extinguishing chambers; the electric arc rapidly enters the double-insulation narrow-slit arc-extinguishing chamber and the metal grid arc-extinguishing chamber under the magnetic driving effect, the insulation narrow slits can compress and cool the electric arc, and the local air pressure is increased, so that the electric arc is further driven to move towards the cutting part of the metal grid; for high-voltage direct-current arc breaking, the arc voltage can be effectively improved, especially the improvement effect on the electric life is more remarkable, and meanwhile, the technical scheme is simple in structure and low in cost.

Description

Arc extinguishing chamber and miniature circuit breaker thereof

Technical Field

The utility model belongs to the technical field of piezoelectric devices, and particularly relates to an arc extinguishing chamber and a miniature circuit breaker thereof.

Background

The system voltage is a main mode of improving efficiency and reducing cost of the system such as photovoltaic power generation, energy storage, new energy vehicle charging and the like, however, the electric arc breaking difficulty of the circuit breaker can be obviously increased by the voltage improvement, and the number of times of electric service life can be obviously reduced. The above-described systems are typically dc, low voltage dc breakers break the arc, and typically require an increase in the arc voltage to a level comparable to or even higher than the system voltage to break the arc. If the system voltage is too high, the energy dissipation and the arc elongation function of the arc purely by the action of the moving and static contacts on the elongation of the arc or the movement of the arc on the arc runner may not reach enough voltage values, so that the probability of arc breaking failure or electric life shortening is increased.

Disclosure of Invention

The utility model aims to provide an arc-extinguishing chamber and a miniature circuit breaker thereof, which are used for solving the problems of difficult breaking and low electrical life of a high-voltage direct-current arc in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The utility model provides an arc-extinguishing chamber, which comprises a metal grid arc-extinguishing chamber and a double-insulation narrow-slit arc-extinguishing chamber, wherein the metal grid arc-extinguishing chamber is provided with a plurality of metal grids which are mutually spaced, two sides of each metal grid are fixed by an insulating plate, and the double-insulation narrow-slit arc-extinguishing chamber is of a mountain-shaped structure.

The utility model is further improved in that the opening direction of the metal grid arc-extinguishing chamber is consistent with that of the double-insulation narrow-slit arc-extinguishing chamber.

The utility model is further improved in that the metal gate arc-extinguishing chamber is provided with a first metal gate arc-extinguishing chamber and a second metal gate arc-extinguishing chamber, and the opening directions of the first metal gate arc-extinguishing chamber, the double-insulation narrow-slit arc-extinguishing chamber and the second metal gate arc-extinguishing chamber are consistent.

The utility model is further improved in that the metal gate arc-extinguishing chambers and the double-insulation narrow-slit arc-extinguishing chambers are provided with a plurality of metal gate arc-extinguishing chambers, and the opening directions of the metal gate arc-extinguishing chambers and the double-insulation narrow-slit arc-extinguishing chambers are consistent.

The utility model is further improved in that the bottoms of the two insulating narrow slits of the double-insulating narrow-slit arc extinguishing chamber are provided with air outlets.

A further improvement of the utility model is that the metal grid has W-shaped openings and two V-shaped grooves.

The utility model provides a miniature circuit breaker, which comprises an arc extinguishing chamber, a movable arc runner and a static arc runner, wherein one end of the movable arc runner is connected with a movable contact, one end of the static arc runner is connected with the static contact, one end of the static arc runner, which is far away from the static contact, extends to one end of the arc extinguishing chamber, one end of the movable arc runner, which is far away from the movable contact, extends to the other end of the arc extinguishing chamber, the arc extinguishing chamber is positioned between the movable arc runner and the static arc runner, a magnetic conduction plate is arranged on the movable arc runner, a permanent magnet is arranged in the magnetic conduction plate, a first polar surface of the permanent magnet is contacted with the bottom of the magnetic conduction plate, and a second polar surface of the permanent magnet is contacted with one side surface of the movable arc runner, which is far away from the static arc runner.

The utility model is further improved in that the magnetic conduction plate is of a U-shaped structure, and the U-shaped opening of the magnetic conduction plate faces the direction of the static contact and the static arc running channel.

The utility model is further improved in that the inner sides of the two side walls of the magnetic conduction plate are provided with arc separation walls.

Compared with the prior art, the utility model has the following beneficial effects:

According to the arc extinguishing chamber, by adopting a mode of combining the double-insulation narrow-slit arc extinguishing chamber and the metal grid arc extinguishing chamber, an arc can move rapidly, firstly enters the double-insulation narrow-slit arc extinguishing chamber or simultaneously enters the double-insulation narrow-slit arc extinguishing chamber and the metal grid arc extinguishing chamber, the insulation narrow slits can compress and cool the arc, the local air pressure is improved, the ablation phenomenon of the arc on the metal grid is avoided, the electric service life is prolonged, and the problem that high-voltage direct-current arc breaking is difficult is solved.

Further, the bottoms of the two insulating narrow slits of the double-insulating narrow-slit arc-extinguishing chamber are respectively provided with an air outlet, so that arc hot gas can be discharged.

Further, the metal grid plate has a W-shaped opening and two V-shaped grooves, which enable the arc to penetrate into the cut portions on both sides.

According to the miniature circuit breaker, the advantages of the insulating narrow slits and the metal grid plates are integrated and mutually complemented under the limited space of the arc extinguishing chamber, so that the problem of weak ablation resistance of the metal grid plates on the action of the service life of the metal grid plates is avoided, the nonpolar magnetic drive arc structure of the permanent magnet and the U-shaped magnetic guide plate is effectively combined, the arc voltage of a high-voltage direct current arc can be obviously improved, the service life and the arc breaking capacity of the circuit breaker are improved, and the miniature circuit breaker is simple in structure and low in cost.

Further, the inner sides of the two side walls of the magnetic conduction plate are provided with arc separation walls, so that the magnetic conduction plate can be separated from an electric arc.

Drawings

Fig. 1 is a schematic view of the internal structure of an arc extinguishing chamber according to the present utility model;

FIG. 2 is a schematic diagram of a metal gate arc chute of the present utility model;

FIG. 3 is a schematic diagram of an insulated slot arc chute of the present utility model;

Fig. 4 is a schematic diagram showing a deformation of an inner structure of an arc extinguishing chamber according to the present utility model;

fig. 5 is a schematic diagram showing a deformation of an inner structure of an arc extinguishing chamber according to the present utility model;

fig. 6 is a schematic diagram of a circuit breaker of the present utility model.

1, An arc extinguishing chamber; 1-1, a metal grid arc extinguishing chamber; 1-1-1, a first metal grid arc-extinguishing chamber; 1-1-2, a second metal grid arc extinguishing chamber; 1-2, double-insulation narrow-slit arc extinguishing chambers; 1-11, metal grid sheets; 1-12, insulating board; 1-111, W-shaped opening; 1-112, V-grooves; 1-21, an air outlet; 2. a moving contact; 3. a stationary contact; 4. moving an arc running channel; 5. static arc running channel; 6. a permanent magnet; 7. a magnetic conductive plate; 8. an arc partition wall; 9. a housing; 10. an instantaneous trip structure; 11. an operating mechanism; 12. a bimetal strip time delay tripping structure; 13. a handle.

Detailed Description

The present utility model will be further described with reference to the drawings and examples, but it should not be construed that the scope of the above-described subject matter of the present utility model is limited to the following examples. Various substitutions and alterations are made according to the ordinary skill and familiar means of the art without departing from the technical spirit of the utility model, and all such substitutions and alterations are intended to be included in the scope of the utility model.

Referring to fig. 1-3, the arc extinguishing chamber comprises a metal gate arc extinguishing chamber 1-1 and a double-insulation narrow-slit arc extinguishing chamber 1-2, wherein the metal gate arc extinguishing chamber 1-1 is provided with a plurality of metal gate plates 1-11 which are mutually spaced, two sides of the metal gate plates 1-11 are fixed by insulating plates 1-12, each metal gate plate 1-11 is provided with a W-shaped opening 1-111 and two V-shaped grooves 1-112, the double-insulation narrow-slit arc extinguishing chamber 1-2 is of a mountain-shaped structure, the double-insulation narrow-slit arc extinguishing chamber 1-2 is made of a high-temperature resistant insulating material, and particularly, polyoxymethylene, polyamide, polymethyl methacrylate or polytetrafluoroethylene can be selected as the bottoms of the two insulation narrow-slits of the double-insulation narrow-slit arc extinguishing chamber 1-2, one or more air outlets 1-21 are respectively formed in the bottoms of the two insulation narrow-slit arc extinguishing chambers 1-1 and the opening directions of the double-insulation narrow-slit arc extinguishing chamber 1-2 are consistent.

Referring to fig. 4, as a preferred scheme, the metal gate arc extinguishing chamber 1-1 is provided with a first metal gate arc extinguishing chamber 1-1-1 and a second metal gate arc extinguishing chamber 1-1-2, and the opening directions of the first metal gate arc extinguishing chamber 1-1-1, the double-insulation narrow-slit arc extinguishing chamber 1-2 and the second metal gate arc extinguishing chamber 1-1-2 are consistent.

Referring to fig. 5, as another preferred scheme, the metal gate arc extinguishing chambers 1-1 and the double-insulation narrow-slit arc extinguishing chambers 1-2 are provided with a plurality of metal gate arc extinguishing chambers 1-1 and a plurality of double-insulation narrow-slit arc extinguishing chambers 1-2, and the opening directions of the metal gate arc extinguishing chambers 1-1 and the double-insulation narrow-slit arc extinguishing chambers are consistent.

Referring to fig. 1-6, the miniature circuit breaker comprises an arc extinguishing chamber 1, a moving contact 2, a fixed contact 3, a moving arc runner 4, a fixed arc runner 5, a permanent magnet 6, a magnetic conduction plate 7, an arc separation wall 8, a shell 9, an instantaneous trip structure 10, an operating mechanism 11, a bimetallic strip time delay trip mechanism 12 and a handle 13; one end of the moving arc runner 4 is in soft connection with the moving contact 2 through a copper wire, one end of the moving arc runner 5 is fixedly connected with the moving contact 3, one end of the moving arc runner 4, which is far away from the moving contact 2, extends to one end of the arc extinguishing chamber 1, one end of the moving arc runner 5, which is far away from the moving contact 3, extends to the other end of the arc extinguishing chamber 1, namely the arc extinguishing chamber 1 is located between the moving arc runner 5 and one end of the moving arc runner 4, which is far away from the moving contact 3 and the moving contact 2.

The magnetic conduction plate 7 is of a U-shaped structure, the permanent magnet 6 is positioned in the U-shaped structure of the magnetic conduction plate 7, a first polar surface of the permanent magnet 6 is contacted with the bottom of the U-shaped structure, a U-shaped opening of the magnetic conduction plate 7 faces the direction of the fixed contact 3 and the fixed arc runner 5 and is sleeved on the movable arc runner 4, the movable arc runner 4 and the magnetic conduction plate 7 are made of magnetic conduction and electric conduction metal materials, and a second polar surface of the permanent magnet 6 is contacted with one side surface of the movable arc runner 4 far away from the fixed arc runner 5; the arc separation wall 8 is fixed on the inner sides of the two side walls of the U-shaped structure of the magnetic conduction plate 7, covers the inner side wall of the U-shaped structure of the magnetic conduction plate 7, separates the magnetic conduction plate 7 from an electric arc, and the arc separation wall 8 is made of high-temperature resistant insulating materials.

Working principle: firstly, the permanent magnet 6 is matched with the U-shaped magnetic conduction plate 7 to generate acting force towards the arc extinguishing chamber 1, the arc can move towards the arc extinguishing chamber 1 more quickly, and then the arc enters the insulating narrow slits or simultaneously enters the double-insulating narrow slit arc extinguishing chamber 1-2 and the metal grid arc extinguishing chamber 1-1 by utilizing the two arc extinguishing chambers 1 which are alternately arranged along the axial direction of the arc, namely the double-insulating narrow slit arc extinguishing chamber 1-2 and the metal grid arc extinguishing chamber 1-1, so that the insulating narrow slits can compress and cool the arc, and the local air pressure is promoted, and the arc is further driven to move towards the cutting part of the metal grid 1-11. For the direct current arc breaking of high voltage, the arc voltage can be effectively improved, and particularly, the effect of improving the electric life is more remarkable, for example, the arc extinguishing chamber 1-1 is only provided with metal grid plates, the metal grid plates 1-11 can be seriously damaged by the arc after being ablated for multiple times, or adhesion is generated between the metal grid plates 1-11, so that part of the metal grid plates 1-11 lose the cutting effect on the arc, and in contrast, the double-insulation narrow-slit arc extinguishing chamber 1-2 can bear multiple arc ablations and cannot be obviously deteriorated.

The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, one skilled in the art may make modifications and equivalents to the specific embodiments of the present utility model, and any modifications and equivalents not departing from the spirit and scope of the present utility model are within the scope of the claims of the present utility model.

Claims

1. The arc extinguishing chamber is characterized by comprising a metal grid arc extinguishing chamber (1-1) and a double-insulation narrow-slit arc extinguishing chamber (1-2), wherein the metal grid arc extinguishing chamber (1-1) is provided with a plurality of metal grid plates (1-11) which are mutually spaced, two sides of each metal grid plate (1-11) are fixed by an insulating plate (1-12), and the double-insulation narrow-slit arc extinguishing chamber (1-2) is of a mountain-shaped structure.

2. An arc chute according to claim 1, characterized in that the metal gate arc chute (1-1) is aligned with the opening direction of the double insulated slot arc chute (1-2).

3. An arc chute as claimed in claim 1, characterized in that the metal gate arc chute (1-1) has a first metal gate arc chute (1-1-1) and a second metal gate arc chute (1-1-2), the first metal gate arc chute (1-1-1), the double insulation slot arc chute (1-2) and the second metal gate arc chute (1-1-2) being open in the same direction.

4. An arc extinguishing chamber according to claim 1, characterized in that the metal gate arc extinguishing chamber (1-1) and the double insulation narrow slit arc extinguishing chamber (1-2) are provided with a plurality of metal gate arc extinguishing chambers (1-1) and a plurality of double insulation narrow slit arc extinguishing chambers (1-2) with the same opening direction.

5. An arc chute according to claim 1, characterized in that the bottoms of both insulating slits of the double insulating slit arc chute (1-2) are provided with air outlets (1-21).

6. An arc chute according to claim 1, characterized in that the metal grid (1-11) has a W-shaped opening (1-111) and two V-shaped grooves (1-112).

7. The utility model provides a miniature circuit breaker, a serial communication port, including explosion chamber (1), move run arc way (4) and quiet run arc way (5), the one end that moves run arc way (4) is connected with moving contact (2), the one end that quiet run arc was said (5) is connected with fixed contact (3), the one end that quiet run arc way (5) kept away from fixed contact (3) extends to the one end of explosion chamber (1), the one end that moves run arc way (4) kept away from moving contact (2) extends to the other end of explosion chamber (1), explosion chamber (1) are located to move run arc way (4) and quiet run arc way (5), set up on moving run arc way (4) and lead magnetic board (7), the inside permanent magnet (6) that sets up of magnetic board (7), the first polarity face and the magnetic board (7) bottom contact of permanent magnet (6), the second polarity face and the moving run arc way (4) keep away from a side contact of quiet run arc way (5).

8. A miniature circuit breaker according to claim 7, characterized in that the magnetic plate (7) has a U-shaped structure, the U-shaped opening of the magnetic plate (7) being oriented in the direction of the stationary contact (3) and the stationary run-out (5).

9. A miniature circuit breaker according to claim 7, characterized in that the inner sides of the two side walls of the magnetic conducting plate (7) are provided with arc-dividing walls (8).