CN116092893A - Multi-grid permanent magnet driving arc extinguishing system - Google Patents

Abstract

The invention discloses a multi-grid permanent magnet drive arc extinguishing system which comprises an insulating plate, a contact assembly and a grid arc extinguishing assembly, wherein the insulating plate is arranged on the contact assembly; the insulation board comprises a front insulation board and side insulation boards, the front insulation board is arranged on two sides of the contact assembly, one end of the front insulation board faces the contact assembly, and the other end of the front insulation board is provided with a first permanent magnet group; the contact assembly can realize switching-on and switching-off through rotation, and the grid arc extinguishing assembly is arranged on the radial outer side of an arc line through which the contact assembly rotates in a surrounding manner; the side insulating board surrounds the radial outside that sets up the arc that passes at the bars piece arc extinction subassembly along the contact subassembly rotation, and the radial outside that the arc was passed along the contact subassembly rotation to the side insulating board surrounds and is provided with additional permanent magnet group. The invention can improve the number of the grid plates, simultaneously provides strong magnetic field drive for the electric arc to deviate from the contact rapidly and enter the grid plate arc-extinguishing chamber, can drive the electric arc in various current directions to move towards the arc-extinguishing chamber, and is effective for bidirectional nonpolar direct current and alternating current.

Description

Multi-grid permanent magnet driving arc extinguishing system

Technical Field

The invention belongs to the technical field of piezoelectric devices, and particularly relates to a multi-grid permanent magnet driving arc extinguishing system.

Background

The plastic shell circuit breaker is important control and protection equipment in the field of low-voltage power distribution, and along with the continuous provision of the electric power industry on the performance requirements of the piezoelectric device, miniaturization, high performance and high reliability become an important technical development direction of the plastic shell circuit breaker at the present stage. The breaking capacity of high voltage and high current is an important index of the molded case circuit breaker, and the key link of the design is the design of an arc extinguishing system of the molded case circuit breaker.

The plastic-case circuit breaker in the prior art generally comprises a mechanism part, a movable contact part, an arc-extinguishing chamber part and the like, wherein the arc-extinguishing chamber is of a metal grid arc-extinguishing chamber structure and is arranged near the movable contact and the movable contact, and an arc is introduced into the arc-extinguishing chamber through a reasonable arc striking structure, so that on one hand, the ablation of the arc to a contact is reduced, on the other hand, the arc can be cut into a plurality of short arcs by the metal grid in the arc-extinguishing chamber, a plurality of near-voltage drops are provided, the arc voltage is improved, and the current-limiting and breaking purposes are achieved. Therefore, the electric arc rapidly enters a plurality of grid sheets as much as possible and is effectively cut into a plurality of sections of short arcs, which is a key for improving the breaking capacity of the plastic-case circuit breaker on high voltage and large current.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention aims to provide a multi-grid permanent magnet driving arc extinguishing system, which utilizes the cooperation of a permanent magnet and a magnetizer, so that the number of grids is increased, and meanwhile, powerful magnetic field driving is provided for the electric arc to quickly deviate from a contact and enter a grid arc extinguishing chamber.

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

a multi-grid permanent magnet drive arc extinguishing system comprises an insulating plate, a contact assembly and a grid arc extinguishing assembly;

the insulation board comprises a front insulation board and side insulation boards, the front insulation board is arranged on two sides of the contact assembly, one end of the front insulation board faces the contact assembly, and a first permanent magnet group is arranged on the other end of the front insulation board;

the contact assembly can realize switching-on and switching-off through rotation, and the grid arc extinguishing assembly is arranged on the radial outer side of an arc line through which the contact assembly rotates in a surrounding manner; the side insulating plate is arranged on the radial outer side of the arc line which is rotated by the grid arc extinguishing assembly along the contact assembly in a surrounding mode, and the side insulating plate is provided with an additional permanent magnet group on the radial outer side of the arc line which is rotated by the contact assembly in a surrounding mode.

Optionally, the gate arc extinguishing component comprises a first gate group, a second gate group and a third gate group, the first gate group is arranged in the opening direction of the opening state of the contact component, the third gate group can be communicated with the contact component to form an arc when the contact component is opened, and the second gate group is arranged between the first gate group and the third gate group.

Optionally, the additional permanent magnet group includes a second permanent magnet, a third permanent magnet, and a fourth permanent magnet; the second permanent magnet is arranged on the outer side of the first grid sheet group in the direction away from the contact assembly; the fourth permanent magnet is arranged on the outer side of the third grid sheet group in the direction away from the contact assembly; the third permanent magnet is arranged on the outer side of the second grid plate group, which is far away from the direction of the contact assembly.

Optionally, the contact assembly includes a movable conductive portion and a static conductive portion, the movable conductive portion being rotatable and contactable with the static conductive portion; the static conductive part can be communicated with an electric arc between the first grid plate group.

Optionally, a movable contact part is fixed on the movable conductive part, a static contact part matched with the movable contact part is fixed on the static conductive part, and the movable contact part and the static contact part can be contacted; and a movable arc striking part is arranged on the other side of the end part of the movable conductive part and used for guiding an electric arc to the third grid sheet group.

Optionally, a static arc striking part is fixedly connected to the static conductive part and is used for guiding the electric arc to the first grid sheet group.

Optionally, the first grid plate group and the third grid plate group are each composed of a plurality of parallel grid plates, and the grid plates of the first grid plate group are mutually perpendicular to the grid plates of the third grid plate group.

Optionally, the second grid sheet group is an L-shaped grid sheet formed by two grid sheets, and an included angle between the two grid sheets of the second grid sheet group is 0-90 degrees.

Optionally, a long grid is arranged on the end part, far away from the second grid, of the third grid, the long grid is parallel to the grid in the third grid, and the length of the long grid is greater than that of the grid in the third grid, and the long grid is used for communicating an electric arc with the contact assembly.

Optionally, the first permanent magnet group includes a side first permanent magnet and a side second permanent magnet, the side first permanent magnet and the side second permanent magnet each include an N-polarity surface and an S-polarity surface, and homopolar surfaces of the side first permanent magnet and the side second permanent magnet are opposite; and the polarity of one surface of the additional permanent magnet group facing the grid plate arc extinguishing assembly is opposite to the polarity of the second side permanent magnet facing the first side permanent magnet.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the grid arc extinguishing assembly is arranged outside the contact assembly, the insulating plate is arranged outside the contact assembly, the first permanent magnet group is arranged outside the insulating plate, and the grid arc extinguishing assembly is arranged outside the contact assembly in a surrounding manner; the side insulating plate surrounds the outside that sets up the bars piece arc extinguishing subassembly, the side insulating plate outside surrounds and is provided with additional permanent magnet group. The number of the grid plates can be increased, powerful magnetic field driving can be provided for the electric arcs to deviate from the contacts rapidly and enter the grid plate arc-extinguishing chamber, the electric arcs in various current directions can be driven to move towards the movement direction of the arc-extinguishing chamber, and the electric arcs are effective to bidirectional nonpolar direct current and alternating current.

Further, the first grid plate group, the second grid plate group and the third grid plate group are arranged, and the electric arc can be conveniently led to the grid plate assembly when a plurality of grid plate groups are arranged.

Further, the movable arc striking part is arranged on the movable conductive part, so that the electric arc can be conveniently guided to the third grid plate group.

Furthermore, the static arc striking part is fixedly connected to the static conductive part, so that the electric arc can be conveniently guided to the first grid sheet group.

Further, the third grid plate group is provided with the long grid plates, so that the electric arc can be conveniently communicated with the contact assembly.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. In the drawings:

fig. 1 is a schematic view of the structure of a contact assembly and a gate arc extinguishing assembly of the present invention;

fig. 2 is a schematic view of the structure of the contact assembly and the gate arc extinguishing assembly of the present invention;

FIG. 3 is a front view of the present invention;

FIG. 4 is a top view of the present invention;

FIG. 5 is a side view of the present invention;

the device comprises a 1-contact assembly, a 101-movable contact part, a 102-static contact part, a 103-movable conductive part, a 104-static conductive part, a 105-movable arc striking part, a 106-static arc striking part, a 2-grid arc extinguishing assembly, a 201-first grid sheet group, a 2011-first short grid sheet group, 2012-second short grid sheet group, 202-second grid sheet group, 2021-U-shaped grid sheet, 203-third grid sheet group, 2031-long grid sheet, 3-permanent magnet arc striking assembly, 301-first permanent magnet group, 3011-side first permanent magnet, 3012-side second permanent magnet, 302-conductor group, 3021-first conductor, 3022-second conductor, 303-second permanent magnet, 304-third permanent magnet and 305-fourth permanent magnet.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 to 5, a multi-grid permanent magnet driving arc extinguishing system comprises an insulating plate, a contact assembly 1 and a grid arc extinguishing assembly 2; the insulation plates comprise a front insulation plate and side insulation plates, the front insulation plates are arranged on two sides of the contact assembly 1, one end of each front insulation plate faces the contact assembly 1, and a first permanent magnet group 301 is arranged on the other end of each front insulation plate;

the contact assembly 1 can realize switching-on and switching-off through rotation, and the grid arc extinguishing assembly 2 is arranged on the radial outer side of an arc through which the contact assembly 1 rotates in a surrounding manner; the side insulating plates are arranged on the radial outer side of an arc line which is formed by the rotation of the grid arc extinguishing assembly 2 along the contact assembly 1 in a surrounding mode.

The contact assembly 1 comprises a movable contact part 101, a static contact part 102, a movable conductive part 103, a static conductive part 104, a movable arc striking part 105 and a static arc striking part 106;

the movable conductive part 103 is a rod, the movable arc striking part 105 is fixed at the end part of the movable conductive part 103, and forms an L-shaped structure with the movable conductive part 103, and the movable arc striking part 105 is arc-shaped. The movable contact part 101 is fixedly mounted on the movable conductive part 103, and the movable striking part 105 is positioned on the back surface of the end surface.

The static conductive part 104 includes an upper plate and a lower plate, which are parallel to each other, and the length of the upper plate is smaller than that of the lower plate. The end part of the upper plate and the end part of the lower plate are fixedly connected through a connecting plate. The connecting plate is perpendicular to the upper plate and the lower plate, and the upper plate and the lower plate are oppositely arranged. The stationary contact 102 is fixedly mounted on top of the upper plate.

The movable conductive part 103 can perform arc-shaped rotary motion to realize the opening and closing functions of the molded case circuit breaker, and the movable contact part 101 and the static contact part 102 are contacted in a closing state to connect the movable conductive part 103 and the static contact part 104 for through flow.

The static striking portion 106 with static conductive portion 104 fixed connection, the tip of static striking portion 106 is located the one end of bars piece arc extinguishing component 2, static striking portion 106 includes parallel end and turning end, wherein, parallel end with go up plate and lower plate parallel, highly lie in between plate and the lower plate, turning end one end is connected parallel end, the other end is connected the tip of last plate.

The gate arc extinguishing assembly 2 comprises a first gate group 201 positioned above the static striking part 106, a second gate group 202 positioned in the direction of an extension line of the movable conductive part 103, and a third gate group 203 positioned in the direction of one side of the movable conductive part 103 away from the static contact part 102; the second set of grid plates 202 is located between the first set of grid plates 201 and the third set of grid plates 203.

The first grid set 201 is formed by overlapping a plurality of parallel metal grids.

A first short grating group 2011 is arranged at a position, closest to the static striking part 106, of the first grating group 201, and a second short grating group 2012 is arranged at a position, closest to the second grating group 202, of the first grating group 201.

The grid sheets of the first short grid sheet group 2011 are one or a superposition of multiple grid sheets, and the lengths of the grid sheets in the first short grid sheet group 2011 and the second short grid sheet group 2012 are smaller than the length of the grid sheet of the first grid sheet group 201.

Optionally, as shown in fig. 1, the second grid set 202 is a plurality of V-shaped grid plates with wall surfaces having an included angle of 0 ° to 90 °, the opening direction of the V-shaped grid plates is far away from the direction of the movable conductive portion 103, and the V-shaped grid plates are formed by grid plates with two intersecting end portions. The V-shaped grid plates are arranged in a fan shape, and the direction of the fan-shaped opening is a direction away from the movable conductive part 103. Optionally, the second grid set 202 further includes a U-shaped grid 2021, and the U-shaped grid 2021 is sandwiched between a plurality of the V-shaped grids. The U-shaped grating 2021 comprises two grating plates which are identical in size, are oppositely arranged and are parallel to each other, and a connecting short grating plate for connecting the end parts of the two parallel grating plates, wherein the connecting short grating plate is perpendicular to the two parallel grating plates. The opening direction of the U-shaped grid 2021 is a direction away from the movable conductive portion 103.

Alternatively, as shown in fig. 2, one side of the second grid set 202 is close to the top of the first grid set 201, and the other side is close to one side of the third grid set 203. Optionally, the second grid set 202 is an L-shaped grid, an included angle between two walls of the L-shaped grid is 0 ° to 90 °, and an opening direction of the included angle of the L-shaped grid is a direction away from the movable conductive portion 103.

The third grid set 203 includes a plurality of parallel grids with equal size, and the direction of the grids in the third grid set 203 is perpendicular to the direction of the metal grids in the first grid set 201.

Optionally, a long gate 2031 is disposed at an end of the third gate group 203, where the long gate 2031 is located at an end of the third gate group 203 away from the second gate group 202, and a portion of the long gate 2031 that extends is close to the dynamic arc striking portion 105.

As shown in fig. 3, the permanent magnet arc striking assembly 3 includes a first permanent magnet group 301 and a magnetizer group 302, and the side insulating plate is circumferentially provided with an additional permanent magnet group along the radial outer side of the arc through which the contact assembly 1 rotates. The additional permanent magnet group includes: a second permanent magnet 303, a third permanent magnet 304 and a fourth permanent magnet 305.

The plane in which the contact assembly 1 is located is a first plane, the first plane can pass through all components of the contact assembly 1, all components of the grid arc extinguishing assembly 2 can be passed through by the first plane, the first permanent magnet groups 301 are arranged on two sides perpendicular to the first plane, and all components of the first permanent magnet groups 301 do not intersect with the first plane. The magnetic conductor set 302 is disposed on a surface of the first permanent magnet set 301. The second permanent magnet 303, the third permanent magnet 304 and the fourth permanent magnet 305 are all disposed in the first plane.

The gate arc extinguishing assemblies 2 are all made of metal materials. The insulating plates are made of high-temperature-resistant insulating materials.

As shown in fig. 4 and 5, the first permanent magnet set 301 includes a side first permanent magnet 3011 and a side second permanent magnet 3012, the side first permanent magnet 3011 and the side second permanent magnet 3012 each include an N-polarity surface and an S-polarity surface, homopolar surfaces of the side first permanent magnet 3011 and the side second permanent magnet 3012 are opposite, an included angle between the homopolar surfaces which are oppositely arranged is 0 ° to 90 °, and the number of permanent magnet pieces in the side first permanent magnet 3011 and the side second permanent magnet 3012 is equal to or greater than one. When the permanent magnets in the side first permanent magnet 3011 or the side second permanent magnet 3012 are multiple, the permanent magnets are arranged in a superposition or tiling mode.

The magnetizer set 302 includes a first magnetizer 3021 and a second magnetizer 3022, the first magnetizer 3021 is located between the side first permanent magnet 3011 and the contact assembly 1, the second magnetizer 3022 is located between the side second permanent magnet 3012 and the contact assembly 1, and the first magnetizer 3021 and the second magnetizer 3022 are arranged in parallel, and are made of materials with good magnetic permeability.

The second permanent magnet 303 is disposed on the outer side of the first grid set 201 in the direction away from the contact assembly 1. One polar surface of the second permanent magnet 303 faces the first grid set 201, and the other polar surface with opposite polarity faces away from the contact assembly 1.

The third permanent magnet 304 is disposed outside the second grid set 202 in a direction away from the movable conductive portion 103. One polar surface of the third permanent magnet 304 faces the second grid set 202, and the polarity on the polar surface is opposite to the polarity of the polar surface of the side first permanent magnet 3011 facing the contact assembly 1.

The fourth permanent magnet 305 is disposed on the outer side of the third grid set 203 away from the contact assembly 1. One polar surface of the fourth permanent magnet 305 faces the third grid set 203, and the polarity of the polar surface is opposite to the polarity of the polar surface of the side first permanent magnet 3011 facing the contact assembly 1.

The polarity of the side first permanent magnet 3011 near the first magnetic conductor 3021 is the same as the polarity of the side second permanent magnet 3012 near the second magnetic conductor 3022.

The polarity of the second permanent magnet 303 facing the first grid set 201, the polarity of the third permanent magnet 304 facing the second grid set 202, and the polarity of the fourth permanent magnet 305 facing the third grid set 203 are opposite to the polarity of the side second permanent magnet 3012 near the second magnetizer 3022.

Example 1

As shown in fig. 4 to 5, in the present embodiment: the polarity of the side first permanent magnet 3011 near the first magnetic conductor 3021 is N, and the polarity of the side second permanent magnet 3012 near the second magnetic conductor 3022 is N.

The polarity of the second permanent magnet 303 facing the first grid set 201 is S, the polarity of the third permanent magnet 304 facing the second grid set 202 is S, and the polarity of the fourth permanent magnet 305 facing the third grid set 203 is S.

The first magnetic conductor 3021 and the second magnetic conductor 3022 are magnetized by the first permanent magnet group 301, and the magnetic force lines on the surfaces of the first magnetic conductor 3021 and the second magnetic conductor 3022 are both directed to the first plane and deflected in the directions where the second permanent magnet 303, the third permanent magnet 304, and the fourth permanent magnet 305 are located.

When the molded case circuit breaker of this embodiment performs the opening operation, the moving contact portion 101 and the static contact portion 102 are separated and generate an arc therebetween, if the direction of the arc current is that the moving contact portion 101 flows to the static contact portion 102, the arc will inevitably be all or partially deflected sideways due to the instability and diffusivity of the arc self-configuration, if the moving contact portion is deflected to the first conductive magnet 3021, the charged particles will be subjected to the lorentz force in the magnetic field, according to the left hand rule, the arc deflected to the first conductive magnet 3021 side will be subjected to the lorentz force in the direction perpendicular to the first conductive magnet 3022, and if the arc is deflected to the second conductive magnet 3022 side, the arc will still be subjected to the lorentz force deflected to the second conductive magnet 3022 direction in the direction perpendicular to the second conductive magnet 3022, after the arc is deflected to the second conductive magnet 3022 side, when the arc root at the moving contact portion 101 moves to the moving conductive magnet 3021, the contact portion is subjected to the lorentz force in the direction of the first conductive magnet group 201, and the arc 202 moves to the second conductive magnet group 203 in the direction, and the arc group of the arc is further separated from the first conductive magnet group 203, and the arc is further deflected to the second conductive magnet group 203, and the arc is moved to the second conductive magnet group is moved to the first arc group 203, and the arc is further separated from the first conductive magnet group is moved to the second conductive magnet group is moved to the grid group to the second arc section, and the arc is moved to the second arc section is moved to the grid group is moved to the grid section and moves to the grid section, and is moved to the arc stage.

If the direction of the arc current is from the stationary contact part 102 to the movable contact part 101, if the arc generated between the movable contact part 101 and the stationary contact part 102 is shifted toward the first magnetizer 3021, according to the left-hand rule, the arc is still subjected to the lorentz force in the direction perpendicular to the first magnetizer 3021, which is biased toward the first magnetizer 3021; if the arc is offset toward the second magnetic conductor 3022, the arc will receive repulsive force from the magnetic field near the second magnetic conductor 3022, driving the arc to move toward the first magnetic conductor 3021; when the arc is biased to the first magnetizer 3021 side, the arc is subjected to lorentz force in the direction of the first grating group 201, and when the arc root at the movable contact portion 101 moves to the movable striking portion 105, the arc shape is changed into an arc shape far away from the contact assembly 1, at this time, the arc current direction close to the movable striking portion 105 also changes, and the arc continues to move towards the second grating group 202 and the third grating group 203 under the action of the magnetic field at the first magnetizer 3021 side, and finally enters the first grating group 201, the second grating group 202 and the third grating group 203, so that the breaking of the arc is completed.

In summary, in the multi-grid permanent magnet driving arc extinguishing system for the molded case circuit breaker, firstly, the arc extinguishing chamber of the molded case circuit breaker is optimally laid out, and a larger number of grid plates can be arranged than in the prior art; however, after the number of the grid sheets in the arc extinguishing chamber is increased, the difficulty of arc striking and entering the grid sheets is greatly increased, and the scheme aims at the contradiction between the increase of the number of the grid sheets and the striking effect, and utilizes the three-dimensional layout structure of the permanent magnet and the magnetizer to cooperate, so that powerful magnetic field driving is provided for the arc to quickly deviate from the contact and enter the grid sheet arc extinguishing chamber, and the driving force can drive the arc to move towards the movement direction of the arc extinguishing chamber no matter whether the direction of the arc current flows from the static contact part to the movable contact part or from the movable contact part to the static contact part.

The device elements in the above embodiments are conventional device elements unless otherwise specified, and the structural arrangement, operation or control modes in the embodiments are conventional arrangement, operation or control modes in the art unless otherwise specified.

Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. The multi-grid permanent magnet driving arc extinguishing system is characterized by comprising an insulating plate, a contact assembly (1) and a grid arc extinguishing assembly (2);

the insulation board comprises a front insulation board and side insulation boards, the front insulation board is arranged on two sides of the contact assembly (1), one end of the front insulation board faces the contact assembly (1), and a first permanent magnet group (301) is arranged on the other end of the front insulation board;

the contact assembly (1) can realize switching-on and switching-off through rotation, and the grid arc extinguishing assembly (2) is arranged on the radial outer side of an arc line through which the contact assembly (1) rotates in a surrounding mode; the side insulating plate is arranged on the radial outer side of the arc line which is formed by the rotation of the contact assembly (1) in a surrounding mode, and the side insulating plate is provided with an additional permanent magnet group in a surrounding mode on the radial outer side of the arc line which is formed by the rotation of the contact assembly (1).

2. The multi-grid permanent magnet drive arc extinguishing system according to claim 1, characterized in that the grid arc extinguishing assembly (2) comprises a first grid group (201), a second grid group (202) and a third grid group (203), the first grid group (201) is arranged in an opening direction of the contact assembly (1) in a switching-off state, the third grid group (203) can be communicated with an arc with the contact assembly (1) when the contact assembly (1) is switched off, and the second grid group (202) is arranged between the first grid group (201) and the third grid group (203).

3. A multi-grid permanent magnet drive arc suppression system according to claim 2, characterized in that the additional permanent magnet group comprises a second permanent magnet (303), a third permanent magnet (304) and a fourth permanent magnet (305); the second permanent magnet (303) is arranged on the outer side of the first grid sheet group (201) in the direction away from the contact assembly (1); the fourth permanent magnet (305) is arranged on the outer side of the third grid sheet group (203) in the direction away from the contact assembly (1); the third permanent magnet (304) is arranged on the outer side of the second grid plate group (202) in the direction away from the contact assembly (1).

4. A multi-grid permanent magnet driven arc extinguishing system according to claim 2, characterized in that the contact assembly (1) comprises a movable conductive part (103) and a static conductive part (104), the movable conductive part (103) being rotatable and being in contact with the static conductive part (104); the static conductive part (104) can be communicated with an arc between the first grid plate group (201).

5. The multi-grid permanent magnet driving arc extinguishing system according to claim 4, wherein a movable contact part (101) is fixed on the movable conductive part (103), a static contact part (102) matched with the movable contact part (101) is fixed on the static conductive part (104), and the movable contact part (101) can be contacted with the static contact part (102); and a movable arc striking part (105) is arranged on the other side of the end part of the movable contact part (101) on the movable conductive part (103) and is used for guiding an arc to the third grid sheet group (203).

6. The multi-grid permanent magnet driven arc extinguishing system according to claim 4, wherein the static conductive portion (104) is fixedly connected with a static striking portion (106) for guiding the arc to the first grid group (201).

7. The multi-grid permanent magnet driven arc extinguishing system according to claim 2, characterized in that the first grid group (201) and the third grid group (203) are each composed of a plurality of parallel grids, and the grids of the first grid group (201) and the grids of the third grid group (203) are mutually perpendicular.

8. The multi-grid permanent magnet driving arc extinguishing system according to claim 2, wherein the second grid group (202) is an L-shaped grid formed by two grids, and an included angle between the two grids of the second grid group (202) is 0-90 °.

9. The multi-grid permanent magnet driving arc extinguishing system according to claim 2, characterized in that a long grid (2031) is arranged on the third grid set (203) at an end far away from the second grid set (202), the long grid (2031) is parallel to the grids in the third grid set (203), and the length of the long grid (2031) is longer than that of the grids in the third grid set (203) and is used for communicating an arc with the contact assembly (1).

10. The multi-grid permanent magnet drive arc extinguishing system according to claim 1, characterized in that the first permanent magnet group (301) comprises a side first permanent magnet (3011) and a side second permanent magnet (3012), the side first permanent magnet (3011) and the side second permanent magnet (3012) each comprise an N-polarity face and an S-polarity face, and homopolar faces of the side first permanent magnet (3011) and the side second permanent magnet (3012) are opposite; the polarity of the side of the additional permanent magnet group facing the grid arc extinguishing component (2) is opposite to the polarity of the side second permanent magnet (3012) facing the side first permanent magnet (3011).

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