CN219303591U

CN219303591U - Magnetic blowout structure of circuit breaker

Info

Publication number: CN219303591U
Application number: CN202223599208.9U
Authority: CN
Inventors: 赵晓泉; 请求不公布姓名
Original assignee: Xi'an Zero One Intelligent Electric Appliance Co ltd
Current assignee: Xi'an Zero One Intelligent Electric Appliance Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-07-04
Anticipated expiration: 2032-12-30

Abstract

The utility model provides a magnetic blowout structure of a circuit breaker, which comprises a first magnetic conduction plate and a second magnetic conduction plate which are arranged in opposite directions, wherein a moving arc root movement track and a static arc root movement track are arranged between the first magnetic conduction plate and the second magnetic conduction plate in a centering manner, the moving arc root movement track, the static arc root movement track, the first magnetic conduction plate and the second magnetic conduction plate enclose an arc movement cavity, a first permanent magnet and a second permanent magnet are respectively arranged on the inner side walls of the first magnetic conduction plate and the second magnetic conduction plate, homopolar surfaces of the first permanent magnet and the second permanent magnet are arranged in opposite directions, and the first permanent magnet and the second permanent magnet are arranged close to the arc extinguishing chamber. The utility model drives and accelerates the movement of the electric arc through the combined action of the external magnetic field and the magnetic conduction plate, and can effectively solve the problems of difficult breaking of direct current critical current and great difficulty in improving the electric life under rated current in the prior art.

Description

Magnetic blowout structure of circuit breaker

Technical Field

The utility model belongs to the technical field of piezoelectric devices, and particularly relates to a magnetic blowout structure of a circuit breaker.

Background

The direct current has no natural zero crossing point, so that the breaking of the direct current arc is more difficult than that of the alternating current arc. In the prior art, arc voltage is raised through the ways of stretching, compressing, cooling, cutting the arc and the like, and current is limited to cross zero to break the arc.

In the case of a direct-current high-current arc, the arc is usually easily broken by the above means in combination with a plurality of metal grid pieces. However, the scheme related to the prior art has the problems that the arc driving force of the direct current critical current is insufficient, the breaking is difficult, the breaking of the rated current is very serious due to long arcing time, and the like.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a magnetic blowout structure of a circuit breaker, which drives and accelerates the movement of an electric arc through the combined action of an external magnetic field and a magnetic conduction plate, can effectively solve the problems of difficult breaking of direct current critical current and great difficulty in improving the electric life under rated current in the prior art, and is effective for the electric arc of bidirectional direct current.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a magnetic blow out arc extinguishing structure of circuit breaker, including the first magnetic conduction board and the second magnetic conduction board that set up in opposite directions, move arc root motion track and quiet arc root motion track and arrange between first magnetic conduction board and second magnetic conduction board in the middle, move arc root motion track, quiet arc root motion track, first magnetic conduction board and second magnetic conduction board enclose into the electric arc motion cavity, be provided with first permanent magnet and second permanent magnet on the inside wall of first magnetic conduction board and second magnetic conduction board respectively, the homopolar face of first permanent magnet and second permanent magnet sets up relatively, first permanent magnet and second permanent magnet are close to the explosion chamber setting.

Further, the device also comprises a moving contact and a fixed contact which are arranged in opposite directions, wherein the first magnetic conduction plate and the second magnetic conduction plate are arranged on two sides of the moving contact and the fixed contact.

Further, one end of the moving contact is provided with a moving arc root moving track, one end of the static contact is provided with a static arc root moving track, and the first magnetic conduction plate and the second magnetic conduction plate are arranged at the other ends of the moving contact and the static contact.

Further, the moving arc root moving track and the static arc root moving track are arranged at intervals in parallel.

Further, an arc extinguishing chamber is arranged between the moving arc root moving track and the static arc root moving track.

Further, the arc extinguishing chamber is composed of a plurality of metal grid plates, the metal grid plates are arranged in parallel at intervals, and the metal grid plates are arranged towards the first magnetic conduction plate and the second magnetic conduction plate.

Further, the long edges of the first permanent magnet and the second permanent magnet are arranged along the superposition direction of the metal grid plates of the arc extinguishing chamber.

Further, the first permanent magnet and the second permanent magnet are of cuboid structures, and two surfaces with the largest area are polar surfaces.

Further, the other polar surface of the first permanent magnet is in contact with the first magnetic conductive plate, and the other polar surface of the second permanent magnet is in contact with the second magnetic conductive plate.

Further, the first permanent magnet and the second permanent magnet are identical in structure, material and performance.

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

according to the magnetic blowout and arc extinguishing structure of the circuit breaker, provided by the utility model, through the scheme that the first magnetic conduction plates and the second magnetic conduction plates which are positioned on the two sides of the moving arc root moving track and the static arc root moving track are provided with the pair of first permanent magnets and the pair of second permanent magnets with opposite homopolar surfaces, lorentz force acting on the electric arc in the direction of an arc extinguishing chamber can be generated, the movement of the electric arc to the arc extinguishing chamber is accelerated, the problems that the direct current critical current breaking difficulty and the electric life lifting difficulty under the rated current are high in the prior art can be effectively solved, and the magnetic blowout of the bidirectional direct current is effective.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a permanent magnet and magnetic conductive plate structure according to an embodiment of the present utility model;

FIG. 3 is a side view of a permanent magnet and magnetic conductive plate layout in an embodiment of the utility model;

FIG. 4 is a top view of a permanent magnet and magnetic conductive plate layout in an embodiment of the utility model;

FIG. 5 is a schematic diagram showing the magnetization effect of S poles of a permanent magnet according to an embodiment of the present utility model;

fig. 6 is a schematic diagram showing the relative magnetization effect of N poles of a permanent magnet according to an embodiment of the present utility model.

Wherein: 1. a moving contact; 2. a stationary contact; 31. a first magnetic conductive plate; 32. a second magnetic conductive plate; 41. a first permanent magnet; 42. a second permanent magnet; 5. a moving arc root movement track; 6. static arc root motion track; 7. an arc extinguishing chamber.

Detailed Description

The utility model is further described below with reference to the drawings and the detailed description.

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is to be noted that when one component is considered to be "connected" to another component, it may be directly connected to the other component, or several components may exist at the same time. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. It should also be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless otherwise specifically defined and limited; either mechanically or electrically, or by communication between two components. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

It should be further noted that, in the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model.

Referring to fig. 1, the utility model provides a magnetic blowout structure of a circuit breaker, which is provided with a moving contact 1 and a fixed contact 2, wherein the moving contact 1 has two fixed positions relative to the fixed contact 2, and a first position is a contact position with the fixed contact 2, namely a closing position of the moving contact 1 and the fixed contact 2; the second position is a position with a relative distance from the fixed contact 2, namely a brake separating position of the movable contact 1 and the fixed contact 2, and the distance between the two positions is a contact opening distance. When the moving contact 1 and the fixed contact 2 are positioned at the closing position, current can be conducted, if the circuit breaker receives a switching-off instruction, the moving contact 1 is driven by an operating mechanism of the circuit breaker to rapidly leave the fixed contact 2, and an electric arc can be generated between the moving contact 1 and the fixed contact 2. The electric arc is a high-temperature high-heat and conductive gas, and moves under the actions of an electric field, a magnetic field, a pressure gradient and the like.

Referring to fig. 2, 3 and 4, the present embodiment further includes a first magnetic conductive plate 31 and a second magnetic conductive plate 32, the first magnetic conductive plate 31 and the second magnetic conductive plate 32 are disposed on two sides of the moving contact 1 and the fixed contact 2, and the first magnetic conductive plate 31 and the second magnetic conductive plate 32 are located at one ends of the moving contact 1 and the fixed contact 2;

the permanent magnet assembly comprises a first permanent magnet 41 and a second permanent magnet 42, wherein the first permanent magnet 41 and the second permanent magnet 42 are positioned on the inner side of a channel formed by the first magnetic conduction plate 31 and the second magnetic conduction plate 32, the homopolar surfaces of the first permanent magnet 41 and the second permanent magnet 42 are oppositely arranged, the other polar surface of the first permanent magnet 41 is contacted with the first magnetic conduction plate 31, and the other polar surface of the second permanent magnet 42 is contacted with the second magnetic conduction plate 32;

a moving arc root movement track 5 and a static arc root movement track 6 are arranged at one end of the moving contact 1 and the fixed contact 2, the moving arc root movement track 5 and the static arc root movement track 6 are arranged on the symmetrical surfaces of the first magnetic conduction plate 31 and the second magnetic conduction plate 32 in a centering way, the moving arc root movement track 5 and the static arc root movement track 6 are oppositely arranged, and an arc movement cavity is formed by surrounding the moving arc root movement track 5 and the static arc root movement track 6 and the first magnetic conduction plate 31 and the second magnetic conduction plate 32;

the arc extinguishing chamber 7 is formed by a plurality of mutually-spaced and parallel metal grid plates, and the arc extinguishing chamber 7 is arranged between the moving arc root moving track 5 and the static arc root moving track 6.

The moving contact 1 and the fixed contact 2 are oppositely arranged, a moving arc root moving track 5 and a fixed arc root moving track 6 are arranged at one ends of the moving contact 1 and the fixed contact 2, a first magnetic conduction plate 31 and a second magnetic conduction plate 32 which are positioned at two sides of the moving arc root moving track 5 and the fixed arc root moving track 6, a first permanent magnet 41 positioned at the inner side of the first magnetic conduction plate 31, a second permanent magnet 42 positioned at the inner side of the second magnetic conduction plate 32, and an arc extinguishing chamber 7 arranged at the other ends of the first magnetic conduction plate 31 and the second magnetic conduction plate 32.

Referring to fig. 5, in the present embodiment, the S-polar surfaces of the first permanent magnet 41 and the second permanent magnet 42 are disposed opposite to each other, in other words, the N-polar surface of the first permanent magnet 41 is in contact with the first magnetic conductive plate 31, and the N-polar surface of the second permanent magnet 42 is in contact with the second magnetic conductive plate 32, so that the first magnetic conductive plate 31 and the second magnetic conductive plate 32 are magnetized by the first permanent magnet 41 and the second permanent magnet 42, respectively, and the polarities of the first magnetic conductive plate 31 and the second magnetic conductive plate 32 after magnetization except the areas covered by the first permanent magnet 41 and the second permanent magnet 42 are N. A magnetic field perpendicular to the direction of the magnetic conductive plates exists near the inner surfaces of the first magnetic conductive plate 31 and the second magnetic conductive plate 32, and on the other hand, a magnetic field component directed toward the arc extinguishing chamber 7 exists in the region between the first magnetic conductive plate 31 and the second magnetic conductive plate 32 due to the polar surfaces of the first permanent magnet 41 and the second permanent magnet 42S. When the direct current arc enters the area between the first magnetic conductive plate 31 and the second magnetic conductive plate 32, it is easy to know that the direct current arc will deviate to the first magnetic conductive plate 31 or the second magnetic conductive plate 32 under the action of the magnetic field component pointing to the direction of the arc extinguishing chamber according to the left hand rule, and move to the direction of the arc extinguishing chamber 7 under the action of the magnetic field of the side magnetic conductive plate perpendicular to the direction of the magnetic conductive plates. In the above process, the arc is biased to one of the magnetic conductive plates due to the difference of the current directions, if the current direction is from the fixed contact to the moving contact, the arc is biased to the first magnetic conductive plate 31, and a magnetic field component perpendicular to the magnetic conductive plate direction and pointing to the second magnetic conductive plate 32 exists near the first magnetic conductive plate 31, and the arc is subjected to lorentz force pointing to the direction of the arc extinguishing chamber 7. If the direction of the current is from the moving contact to the stationary contact, the arc will be biased towards the second magnetically permeable plate 32, and there is a magnetic field component in the vicinity of the second magnetically permeable plate 32 perpendicular to the direction of the magnetically permeable plate and directed towards the first magnetically permeable plate 31, the arc will be subjected to lorentz forces directed towards the arc chute 7.

Referring to fig. 6, in the present embodiment, the N-polar surfaces of the first permanent magnet 41 and the second permanent magnet 42 are disposed opposite to each other, in other words, the S-polar surface of the first permanent magnet 41 is in contact with the first magnetic conductive plate 31, and the S-polar surface of the second permanent magnet 42 is in contact with the second magnetic conductive plate 32, so that the first magnetic conductive plate 31 and the second magnetic conductive plate 32 are magnetized by the first permanent magnet 41 and the second permanent magnet 42, respectively, and the polarities of the first magnetic conductive plate 31 and the second magnetic conductive plate 32 after magnetization except the areas covered by the first permanent magnet 41 and the second permanent magnet 42 are S. Similar to the previous discussion, the arc will be biased towards either the first 31 or the second 32 magnetic plate due to the different current direction, and will move towards the arc chute 7 under the influence of the magnetic field of the side magnetic plate perpendicular to the direction of the magnetic plate.

The first permanent magnet 41 is located on a side of the first magnetic conductive plate 31 facing the second magnetic conductive plate 32 and is close to one end of the arc extinguishing chamber 7, and the second permanent magnet 42 is located on a side of the second magnetic conductive plate 32 facing the first magnetic conductive plate 31 and is close to one end of the arc extinguishing chamber 7.

The first permanent magnet 41 and the second permanent magnet 42 are identical in structure, material and performance, are of cuboid structures, the two surfaces with the largest areas are polar surfaces, the long edges of the first permanent magnet 41 and the second permanent magnet 42 are arranged along the overlapping direction of the metal bars of the arc extinguishing chamber 7, and as arc roots move along dynamic and static arc running paths respectively, the arrangement of the long edges along the overlapping direction of the metal bars can enable the whole arc of the arc before entering the arc extinguishing chamber to be subjected to strong electromagnetic force, so that the arc is easier to enter the arc extinguishing chamber.

In summary, according to the magnetic blowout and arc extinguishing structure of the circuit breaker, through the scheme that the pair of permanent magnets with opposite homopolar surfaces are arranged on the inner sides of the magnetic conduction plates positioned on the two sides of the movable arc chute and the static arc chute, lorentz force acting towards the direction of the arc extinguishing chamber can be generated on the electric arc, movement of the electric arc towards the arc extinguishing chamber is accelerated, the problems that in the prior art, direct current critical current breaking is difficult, and the electric life under rated current is difficult to improve are effectively solved, and the magnetic blowout and arc extinguishing structure is effective on electric arcs of bidirectional direct current.

The above is only for illustrating the technical idea of the present utility model, and the protection scope of the present utility model is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present utility model falls within the protection scope of the claims of the present utility model.

Claims

1. The utility model provides a magnetic blow-out arc extinguishing structure of circuit breaker, a serial communication port, including first magnetic conduction board (31) and second magnetic conduction board (32) that set up in opposite directions, move arc root motion track (5) and quiet arc root motion track (6) and arrange between first magnetic conduction board (31) and second magnetic conduction board (32) in the middle, move arc root motion track (5), quiet arc root motion track (6), first magnetic conduction board (31) and second magnetic conduction board (32) enclose into the arc motion cavity, be provided with first permanent magnet (41) and second permanent magnet (42) on the inside wall of first magnetic conduction board (31) and second magnetic conduction board (32) respectively, the homopolar face of first permanent magnet (41) and second permanent magnet (42) sets up relatively, first permanent magnet (41) and second permanent magnet (42) are close to explosion chamber (7) setting.

2. The magnetic blowout structure of the circuit breaker according to claim 1, further comprising a moving contact (1) and a fixed contact (2) which are arranged in opposite directions, wherein the first magnetic conduction plate (31) and the second magnetic conduction plate (32) are arranged on two sides of the moving contact (1) and the fixed contact (2).

3. The magnetic blowout structure of a circuit breaker according to claim 2, wherein one end of the moving contact (1) is provided with a moving arc root moving track (5), one end of the static contact (2) is provided with a static arc root moving track (6), and the first magnetic conduction plate (31) and the second magnetic conduction plate (32) are arranged at the other ends of the moving contact (1) and the static contact (2).

4. A magnetic blowout structure of a circuit breaker according to claim 1 or 3, characterized in that the moving arc root movement track (5) and the static arc root movement track (6) are arranged in parallel and spaced apart.

5. A magnetic blowout structure of a circuit breaker according to claim 1, characterized in that an arc extinguishing chamber (7) is arranged between the moving arc root movement track (5) and the static arc root movement track (6).

6. A magnetic blowout structure of a circuit breaker according to claim 1 or 5, characterized in that the extinguishing chamber (7) consists of a plurality of metal bars arranged in parallel and spaced apart, the metal bars being arranged towards the first (31) and the second (32) magnetic permeability plates.

7. A magnetic quenching structure of a circuit breaker according to claim 1, characterized in that the long edges of the first permanent magnet (41) and the second permanent magnet (42) are arranged along the overlapping direction of the metal bars of the quenching chamber (7).

8. The magnetic blowout structure of a circuit breaker according to claim 1, wherein the first permanent magnet (41) and the second permanent magnet (42) are rectangular parallelepiped structures, and the two faces with the largest area are polar faces.

9. A magnetic blowout structure of a circuit breaker according to claim 1, wherein the other polar surface of the first permanent magnet (41) is in contact with the first magnetically permeable plate (31) and the other polar surface of the second permanent magnet (42) is in contact with the second magnetically permeable plate (32).

10. A magnetic blowout structure of a circuit breaker according to claim 1, characterized in that the first permanent magnet (41) and the second permanent magnet (42) are of identical structure, material, performance.