CN220172048U - Arc extinguishing device and circuit breaker - Google Patents

Abstract

The arc extinguishing device and the breaker of the arc extinguishing device comprises an arc extinguishing chamber, wherein the arc extinguishing chamber comprises an arc extinguishing cavity and a plurality of grid sheet groups, the grid sheet groups comprise a first grid sheet group, a second grid sheet group and a third grid sheet group which are sequentially arranged along the first direction of the arc extinguishing cavity, the first grid sheet group, the second grid sheet group and the third grid sheet group respectively comprise a plurality of first arc extinguishing grid sheets, second arc extinguishing grid sheets and third arc extinguishing grid sheets which are spaced, the extending directions of the first arc extinguishing grid sheets and the second arc extinguishing grid sheets are included angles, an included angle is formed between the extending directions of the first arc extinguishing grid sheets and the second direction, and the second direction is perpendicular to the first direction. According to the utility model, the first arc-extinguishing grid sheet and the second arc-extinguishing grid sheet form an included angle in the extending direction, so that the first arc-extinguishing grid sheet and the second arc-extinguishing grid sheet can extend towards two different directions respectively, the first arc-extinguishing grid sheet or the second arc-extinguishing grid sheet is less limited in extending, the space occupied by the first grid sheet group and the second grid sheet group in the same direction is reduced, and the space utilization rate is improved.

Description

Arc extinguishing device and circuit breaker

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to an arc extinguishing device and a circuit breaker.

Background

The circuit breaker is a device which plays an electric protection role in a circuit, when a movable contact and a fixed contact of the circuit breaker are separated, abnormal current is broken, at the moment, electric arcs are generated between the movable contact and the fixed contact instantly, high-temperature high-pressure gas is generated, and the electric arcs and the high-temperature high-pressure gas sprayed outwards are easy to cause problems such as interphase breakdown and ablation of parts, so that an arc extinguishing chamber matched with a contact mechanism is particularly important. However, with the development of power systems such as power grids and new energy sources, the conventional arc extinguishing chambers have difficulty in considering the development trend of high performance and miniaturization of the circuit breaker due to the limitation of the structure and layout.

Disclosure of Invention

The utility model aims to overcome at least one defect in the prior art and provides an arc extinguishing device and a circuit breaker.

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

the arc extinguishing device comprises an arc extinguishing chamber, the arc extinguishing chamber is matched with a contact mechanism and assembled in a shell together, the arc extinguishing chamber comprises an arc extinguishing cavity and a plurality of grid sheet groups, the grid sheet groups comprise a first grid sheet group, a second grid sheet group and a third grid sheet group which are sequentially arranged along the first direction of the arc extinguishing cavity, the first grid sheet group, the second grid sheet group and the third grid sheet group respectively comprise a plurality of first arc extinguishing grid sheets, second arc extinguishing grid sheets and third arc extinguishing grid sheets which are arranged at intervals, the extending directions of the first arc extinguishing grid sheets and the second arc extinguishing grid sheets are included angles, an included angle is formed between the extending directions of the first arc extinguishing grid sheets and the second direction, and the second direction is perpendicular to the first direction.

Further, the explosion chamber still includes with bars piece group complex magnetism increasing piece, magnetism increasing piece sets up in the lateral wall of explosion chamber along first direction, and first direction is the length direction in explosion chamber.

Further, the explosion chamber includes a pair of gas generating parts, and every gas generating part corresponds the assembly in the opening both sides of explosion chamber, has seted up the mounting groove that is used for assembling the magnetism increasing part in the one side of gas generating part back to the explosion chamber.

Further, the explosion chamber includes the curb plate that a pair of interval set up, and the space between a pair of curb plate is equipped with a plurality of bars piece group as the explosion chamber, and one side that every curb plate is close to contact mechanism is provided with a housing lateral wall, and two housing lateral wall intervals form the opening of explosion chamber relatively, and one side that every housing lateral wall was facing away from the explosion chamber is equipped with gas production spare, is formed with the air current passageway of intercommunication explosion chamber between every gas production spare and the housing lateral wall, air current passageway extends along the third direction, and the two liang of perpendicular of third direction, second direction and first direction.

Further comprises a first arc striking plate and/or a second arc striking plate which are arranged between the arc extinguishing chamber and the contact mechanism,

the contact mechanism comprises a moving contact and a fixed contact which are matched with each other, the first grid sheet group corresponds to the breaking position of the moving contact, one end of the first striking plate extends to one side of the first grid sheet group and is parallel and opposite to the first arc extinguishing grid sheet,

the third grid sheet group is arranged corresponding to the fixed contact, and one end of the second arc striking plate extends to one side of the third grid sheet group and is parallel and opposite to the third arc extinguishing grid sheet.

Further, the arc extinguishing chamber further comprises at least one arc striking grid sheet, and the arc striking grid sheet is positioned between two adjacent grid sheet groups and used for striking an arc.

Further, the second arc-extinguishing grid piece is arranged along the second direction, the first arc-extinguishing grid piece and the third arc-extinguishing grid piece are respectively arranged obliquely along the first direction, and the first arc-extinguishing grid piece and the third arc-extinguishing grid piece are obliquely oriented to the contact mechanism.

Further, a first arc striking grid sheet is arranged between the first grid sheet group and the second grid sheet group, and two ends of the first arc striking grid sheet are respectively parallel to the first arc extinguishing grid sheet and the second arc extinguishing grid sheet;

and a second arc striking grid sheet is arranged between the second grid sheet group and the third grid sheet group, and two ends of the second arc striking grid sheet are respectively parallel to the second arc extinguishing grid sheet and the third arc extinguishing grid sheet.

Further, the arc extinguishing chamber further comprises a magnetism increasing block, wherein the magnetism increasing block corresponds to between the second grid sheet group and the third grid sheet group and is positioned at one side of the second arc striking grid sheet, which is opposite to the contact mechanism.

Further, a third arc striking grid sheet and a fourth arc striking grid sheet are arranged between the first grid sheet group and the second grid sheet group, a fifth arc striking grid sheet and a sixth arc striking grid sheet are arranged between the second grid sheet group and the third grid sheet group, the fourth arc striking grid sheet and the fifth arc striking grid sheet are respectively positioned on two opposite sides of the second grid sheet group, the fourth arc striking grid sheet and the fifth arc striking grid sheet are respectively parallel to the second arc extinguishing grid sheet, one end of the third arc striking grid sheet is parallel to the first arc extinguishing grid sheet, the other end of the third arc striking grid sheet is bent towards the fourth arc striking grid sheet, one end of the sixth arc striking grid sheet is parallel to the third arc extinguishing grid sheet, and the other end of the sixth arc striking grid sheet is bent towards the fifth arc striking grid sheet.

Further, the first arc-extinguishing grid piece is obliquely arranged along the second direction, the second arc-extinguishing grid piece and the third arc-extinguishing grid piece are obliquely arranged along the first direction respectively, and the first arc-extinguishing grid piece and the third arc-extinguishing grid piece are obliquely oriented to the contact mechanism respectively.

Further, the second grid sheet group comprises at least two second sub grid sheet groups which are arranged at intervals along the first direction, a seventh arc striking grid sheet is arranged between the first grid sheet group and the adjacent second sub grid sheet group, one end of the seventh arc striking grid sheet is parallel and opposite to the first arc extinguishing grid sheet, and the other end of the seventh arc striking grid sheet is parallel and opposite to the second arc extinguishing grid sheet of the adjacent second sub grid sheet group;

an eighth arc striking grid sheet is arranged between the third grid sheet group and the adjacent second sub-grid sheet assembly, one end of the eighth arc striking grid sheet is parallel and opposite to the third arc extinguishing grid sheet, and the other end of the eighth arc striking grid sheet is parallel and opposite to the second arc extinguishing grid sheet of the adjacent second sub-grid sheet group;

and a ninth arc striking grid sheet is arranged between the two adjacent second sub-grid sheet groups, and two ends of the ninth arc striking grid sheet are respectively opposite to the second arc extinguishing grid sheets of the two adjacent second sub-grid sheet groups in parallel.

Further, the first arc-extinguishing grid piece is obliquely arranged along the first direction, the second arc-extinguishing grid piece and the third arc-extinguishing grid piece are obliquely arranged along the second direction respectively, and the second arc-extinguishing grid piece and the third arc-extinguishing grid piece are parallel to each other.

The utility model also provides a circuit breaker, which comprises a shell and a contact mechanism arranged in the shell, wherein one side of the contact mechanism is provided with the arc extinguishing device in a matching way.

According to the arc-extinguishing device and the circuit breaker, the first arc-extinguishing grid sheet and the second arc-extinguishing grid sheet form the included angle in the extending direction, so that the first arc-extinguishing grid sheet and the second arc-extinguishing grid sheet can extend towards two different directions respectively, the first arc-extinguishing grid sheet or the second arc-extinguishing grid sheet is less limited in extending, the space occupied by the first grid sheet group and the second grid sheet group in the same direction can be reduced, and the space utilization rate is improved.

In addition, the arc-extinguishing chamber is matched with the magnetism-increasing piece, when the contact mechanism is disconnected, the magnetism-increasing piece is magnetized to form a magnetic field, and the arc is beneficial to fast movement of the arc to the grid sheet group through the matching of the magnetic field formed by the arc, so that the arc-extinguishing efficiency is improved.

In addition, the gas generating piece is provided with a mounting groove, so that an assembling position is provided for the magnetism increasing piece, and the structure of the arc extinguishing chamber is more compact.

In addition, the gas generating part corresponds to the opening of the arc extinguishing cavity, and particularly, the gas generating part is also provided with an air flow channel, so that the arc burns the gas generating part to generate gas, the internal pressure of the arc extinguishing chamber is increased, the formation of a thermal current injection phenomenon is facilitated, the arc is promoted to enter the grid plate group to perform arc cutting, and the arc is extinguished.

In addition, the arrangement direction of the arc extinguishing grid plates of the three grid plate groups is flexible, so that the internal space layout of different circuit breakers can be met; in addition, the arc striking grid plates are arranged between two adjacent grid plate groups, so that the arc mobility between the two adjacent grid plate groups can be improved, and the arc extinguishing efficiency can be improved.

Drawings

Fig. 1 is a schematic structural view of an arc chute according to a first embodiment of the present utility model;

fig. 2 is a side view of the arc chute of the first embodiment of the present utility model;

fig. 3 is an exploded view of an arc chute according to a first embodiment of the present utility model;

fig. 4 is a sectional view of an arc chute according to a first embodiment of the present utility model;

fig. 5 is a schematic diagram of the cooperation of the arc chute and the contact mechanism according to the first embodiment of the present utility model;

fig. 6 is an internal schematic view of the arc chute of the first embodiment of the present utility model;

fig. 7 is a schematic structural view of an arc chute according to a second embodiment of the present utility model;

fig. 8 is a side view of a second embodiment of the utility model;

fig. 9 is an exploded view of an arc chute according to a second embodiment of the present utility model;

fig. 10 is a schematic diagram of the mating of the arc chute and the contact mechanism of the second embodiment of the present utility model;

fig. 11 is a schematic structural view of an arc chute according to a third embodiment of the present utility model;

fig. 12 is a side view of an arc chute according to a third embodiment of the utility model;

fig. 13 is an exploded view of an arc chute according to a third embodiment of the present utility model;

fig. 14 is a sectional view of an arc chute according to a third embodiment of the present utility model;

fig. 15 is a schematic view showing the cooperation of the arc extinguishing chamber and the contact mechanism according to the third embodiment of the present utility model;

fig. 16 is a schematic structural view of an arc chute according to a fourth embodiment of the present utility model;

fig. 17 is a side view of a fourth embodiment of the utility model;

fig. 18 is an exploded view of an arc chute according to a fourth embodiment of the present utility model;

fig. 19 is a sectional view of an arc chute according to a fourth embodiment of the present utility model;

fig. 20 is a schematic view showing the cooperation of the arc extinguishing chamber and the contact mechanism according to the fourth embodiment of the present utility model;

reference numerals:

a-arc extinguishing chamber, a 1-airflow channel, 1-side plate, 2-housing side wall, 3-grid plate group, 31-first grid plate group, 311-first arc extinguishing grid plate, 32-second grid plate group, 321-second arc extinguishing grid plate, 32 a-second branch grid plate group, 33-third grid plate group, 331-third arc extinguishing grid plate, 341-first arc striking grid plate, 342-second arc striking grid plate, 343-third arc striking grid plate, 344-fourth arc striking grid plate, 345-fifth arc striking grid plate, 346-sixth arc striking grid plate, 347-seventh arc striking grid plate, 348-eighth arc striking grid plate, 349-ninth arc striking grid plate, 4-gas generating member, 41-mounting groove, 5-magnetism increasing member, 51-magnetism increasing piece, 61-first arc striking plate, 62-second arc striking plate, 71-moving contact, 72-static contact.

Detailed Description

Embodiments of the arc extinguishing device and the circuit breaker according to the utility model are further described below with reference to the examples given in the accompanying drawings. The arc extinguishing device and the circuit breaker of the present utility model are not limited to the description of the following embodiments.

The circuit breaker comprises a shell, an operating mechanism and a contact mechanism, wherein the operating mechanism and the contact mechanism are arranged in the shell, the contact mechanism comprises a moving contact 71 and a fixed contact 72 which are matched with each other, the moving contact 71 is rotationally assembled in the middle of the shell and is in linkage connection with the operating mechanism, the fixed contact 72 is fixed in the shell and is opposite to the moving contact 71, and the moving contact 71 is driven to contact or separate from the fixed contact 72 through the operating mechanism, so that a main circuit of the circuit breaker is closed; the arc extinguishing device is arranged on one side of the contact mechanism in a matched mode, the arc extinguishing device comprises an arc extinguishing chamber a and an arc striking plate, an arc extinguishing cavity of the arc extinguishing chamber a is opposite to the contact mechanism, a plurality of grid plate groups 3 used for cutting arcs are arranged in the arc extinguishing cavity, each grid plate group 3 comprises a plurality of arc extinguishing grid plates arranged at intervals, an arc extinguishing gap is formed between two adjacent arc extinguishing grid plates, one end of the arc striking plate extends into the arc extinguishing chamber a, the other end of the arc striking plate is connected with the contact mechanism, arcs generated by breaking the contact mechanism are led into the arc extinguishing cavity through the arc striking plate, and the arcs are discharged out of the arc extinguishing chamber a through cutting of the arc extinguishing grid plates and then are discharged through an exhaust port arranged on the shell.

The improvement point of the present utility model is that the plurality of gate sheet groups 3 include a first gate sheet group 31, a second gate sheet group 32 and a third gate sheet group 33 sequentially arranged along a first direction of the arc extinguishing chamber, the first gate sheet group 31, the second gate sheet group 32 and the third gate sheet group 33 respectively include a plurality of first arc extinguishing gate sheets 311, second arc extinguishing gate sheets 321 and third arc extinguishing gate sheets 331 which are arranged at intervals, the extending directions of the first arc extinguishing gate sheets 311 and the second arc extinguishing gate sheets 321 form an included angle, and the extending directions of the first arc extinguishing gate sheets 311 and the second direction form an included angle, and the second direction is perpendicular to the first direction. The first arc-extinguishing grid piece 311 and the second arc-extinguishing grid piece 321 are in an included angle in the extending direction, so that the first arc-extinguishing grid piece 311 and the second arc-extinguishing grid piece 321 can extend towards two different directions respectively, the first arc-extinguishing grid piece 311 or the second arc-extinguishing grid piece 321 is less limited in extension, the space occupied by the first grid piece group 31 and the second grid piece group 32 in the same direction can be reduced, and the space utilization rate is improved.

Specifically, the arc extinguishing chamber a includes a pair of side plates 1 disposed at intervals, the space between the pair of side plates 1 is used as an arc extinguishing chamber to be assembled with a plurality of grid sheet groups 3, the length direction of the side plates 1 is taken as a first direction, the length direction of the side plates 1 is also taken as the length direction of the arc extinguishing chamber, the width direction of the side plates 1 is taken as a second direction, the connecting line direction between the two side plates 1 is taken as a third direction, the first direction, the second direction and the third direction are perpendicular to each other, wherein the first grid sheet group 31 is correspondingly disposed at the breaking position of the movable contact 71, the third grid sheet group 33 is correspondingly disposed with the fixed contact 72, and preferably, the arc extinguishing device further includes a first arc striking plate 61 and/or a second arc striking plate 62 disposed between the arc extinguishing chamber a and the contact mechanism, wherein one end of the first arc striking plate 61 extends to one side of the first grid sheet group 31 and is parallel to be opposite to the first grid sheet 311, and one end of the second arc striking plate 62 extends to one side of the third grid sheet group 33 and is parallel to be opposite to the third arc striking plate 331, so as to facilitate the introduction of the arc extinguishing chamber after breaking of the contacts into the arc extinguishing chamber.

Further, the arc-extinguishing chamber a further comprises a magnetism-increasing piece 5 matched with the grid sheet group 3, the magnetism-increasing piece 5 is arranged on the side wall of the arc-extinguishing cavity along the first direction, and when the contact mechanism is disconnected, the magnetism-increasing piece 5 is magnetized to form a magnetic field, so that the arc can move towards the grid sheet group 3 quickly, and the arc-extinguishing efficiency is improved.

Further, explosion chamber a still includes gas production spare 4, and every gas production spare 4 corresponds the assembly in the opening both sides of explosion chamber, makes electric arc burn gas production spare 4 produce gas, increases explosion chamber a internal pressure, does benefit to electric arc entering explosion chamber and is extinguished, has seted up mounting groove 41 in the one side that gas production spare 4 was facing away from the explosion chamber, and magnetism increasing piece 5 corresponds the assembly in mounting groove 41, and gas production spare 4 provides the assembly position for magnetism increasing piece 5, makes the structure of explosion chamber a compacter.

In connection with fig. 1-6, a first embodiment of an arc extinguishing device is provided, which comprises an arc extinguishing chamber a and a first striking plate 61, wherein the arc extinguishing chamber a comprises an arc extinguishing chamber and a first grating sheet group 31, a second grating sheet group 32 and a third grating sheet group 33 assembled in the arc extinguishing chamber, in this embodiment, the arc extinguishing chamber a comprises a pair of side plates 1 arranged at intervals, the space between the two side plates 1 is taken as the arc extinguishing chamber, the first grating sheet group 31, the second grating sheet group 32 and the third grating sheet group 33 are assembled between the pair of side plates 1 along a first direction, a housing side wall 2 is arranged at one side of each side plate 1 close to a contact mechanism, two housing side walls 2 are arranged at intervals to form an opening of the arc extinguishing chamber, and a moving contact 71 performs switching-on/off swinging at the opening of the arc extinguishing chamber, that is, the moving contact 71 is separated from or contacted with a fixed contact 72 along the first direction.

As shown in fig. 2, 3, 5 and 6, the first gate group 31 is correspondingly disposed at the breaking position of the moving contact 71, and the first gate group 31 includes a plurality of first arc extinguishing gate plates 311 disposed obliquely along the first direction, such that one end of each first arc extinguishing gate plate 311 is inclined toward the contact mechanism, that is, one end of the first arc extinguishing gap between two adjacent first arc extinguishing gate plates 311 is inclined toward the contact mechanism; the third grid plate group 33 is disposed corresponding to the fixed contact 72, and the third grid plate group 33 includes a plurality of third arc extinguishing grid plates 331 disposed obliquely along the first direction, such that one end of each third arc extinguishing grid plate 331 is obliquely oriented to the contact mechanism, that is, one end of each adjacent two third arc extinguishing gaps is obliquely oriented to the contact mechanism; the second gate sheet group 32 is located between the first gate sheet group 31 and the third gate sheet group 33, the second gate sheet group 32 includes a plurality of second arc-extinguishing gate sheets 321 that are disposed along the second direction, one end of the second arc-extinguishing gap between two adjacent second arc-extinguishing gate sheets 321 is connected with the swing track of the moving contact 71, preferably, the first arc-extinguishing gate sheets 311 and 331 are disposed at an included angle with the second arc-extinguishing gate sheets 321, and the first arc-extinguishing gap and the third arc-extinguishing gap are inclined and opposite, and arc-extinguishing grooves are respectively formed at one side edges of the first arc-extinguishing gate sheets 311, the second arc-extinguishing gate sheets 321 and the third arc-extinguishing gate sheets 331 facing the contact mechanism, in this embodiment, the extension of the second arc-extinguishing gate sheets 321 is limited by the width of a pair of side plates 1, and the inclined setting of the first arc-extinguishing gate sheets 311 and the third arc-extinguishing gate sheets 331 is not limited by the width of the side plates 1, so that the size of the first arc-extinguishing gate sheets 311 and the third arc-extinguishing gate sheets 331 can be larger than the size of the second arc-extinguishing gate sheets 321, but the size of the arc-extinguishing chamber a is not increased, and the inner space utilization rate and efficiency are improved.

Further, the arc extinguishing chamber a further includes at least one arc striking grid sheet, the arc striking grid sheet is disposed between two adjacent grid sheet groups 3 for striking an arc, specifically as shown in fig. 3, 5 and 6, a first arc striking grid sheet 341 is disposed between the first grid sheet group 31 and the second grid sheet group 32, preferably the first arc striking grid sheet 341 is in an integrally formed plate structure, the middle part of the first arc striking grid sheet 341 is bent, two ends of the first arc striking grid sheet 341 are respectively parallel to the first arc extinguishing grid sheet 311 and the second arc extinguishing grid sheet 321, one end of the first arc striking grid sheet 341 is parallel to the first arc extinguishing grid sheet 311 at the lowest side of the first grid sheet group 31 in fig. 5 and 6, and the other end is parallel to the second arc extinguishing grid sheet 321 adjacent to the first grid sheet group 31 in the second grid sheet group 32; a second arc striking grid 342 is disposed between the second grid 32 and the third grid 33, as shown in fig. 5 and 6, the second arc striking grid 342 is also an integrally formed plate structure, and the middle of the second arc striking grid 342 is bent, so that two ends of the second arc striking grid 342 are parallel to the second arc extinguishing grid 321 and the third arc extinguishing grid 331 respectively, in the figure, one end of the second arc striking grid 342 is parallel to the third arc extinguishing grid 331 at the lowest side of the third grid 33, and the other end is parallel to the second arc extinguishing grid 321 of the second grid 32 adjacent to the second grid 32.

The electric arcs generated after the movable contact 71 and the fixed contact 72 are separated are divided into three sections of electric arcs by the three grid plate groups 3, each section of electric arcs respectively enter the first grid plate group 31, the second grid plate group 32 and the third grid plate group 33 and are gradually elongated, divided and cut off, the single electric arc capacity is reduced, the electric arcs are more favorably divided and extinguished by the grid plate groups 3, the electric arcs can flow between the two adjacent grid plate groups 3 through the first arc striking grid plate 341 and the second arc striking grid plate 342, the electric arc fluidity is improved, and the arc extinguishing capacity is further improved.

Further, the arc-extinguishing chamber a further comprises a gas generating part 4 and a magnetism increasing part 5, as shown in fig. 1-6, one side of the side wall 2 of the housing, which faces away from the arc-extinguishing chamber, is respectively provided with the gas generating part 4, the gas generating part 4 is attached to the side wall 2 of the housing and corresponds to the opening of the arc-extinguishing chamber, when the contact mechanism is disconnected, the gas generating part 4 is burned by the electric arc to generate gas, so that pressure difference is generated inside and outside the arc-extinguishing chamber a, a thermal current spraying phenomenon is formed, the thermal current spraying phenomenon is more beneficial to the electric arc entering the grid plate, electric arc cutting is performed, and the electric arc is extinguished; an air flow channel a1 communicated with the arc extinguishing cavity is arranged between the gas generating piece 4 and the side wall 2 of the housing, wherein the air flow channel a1 extends along a third direction, the air flow channel a1 triggers the energy release to act rapidly, and the moving contact 71 is opened rapidly to further promote the electric arc to move towards the direction of the grid sheet group 3. In this embodiment, the energy trip is derived from the pressure gas generated by the arc extinguishing chamber a, the high-temperature arc generated when the moving contact 71 and the fixed contact 72 are separated burns the side wall 2 of the housing, high-temperature high-pressure gas is generated, and a mechanism which is in linkage with the trip mechanism is arranged outside the air flow channel a1 and is pushed by the high-pressure gas discharged by the air flow channel a 1. In this embodiment, the magnetism increasing members 5 are assembled on the side walls of the arc extinguishing chamber along the first direction, and preferably, the magnetism increasing members 5 are assembled on the gas generating members 4, and a mounting groove 41 is formed on one side of each gas generating member 4 facing away from the arc extinguishing chamber, and the magnetism increasing members 5 are correspondingly assembled in the mounting groove 41, so that the overall structure of the arc extinguishing chamber a is compact, and the volume of the arc extinguishing chamber a is prevented from being increased. In addition, the arc extinguishing chamber a further includes a magnetism increasing block 51, where the magnetism increasing block 51 is correspondingly assembled between the second grid plate set 32 and the third grid plate set 33 and is located at a side of the second arc striking grid plate 342 opposite to the contact mechanism, and in fig. 2, 5 and 6, the magnetism increasing block 51 is located between the pair of side plates 1 and is correspondingly disposed in a bending area of the second arc striking grid plate 342, so as to facilitate enhancing a magnetic field.

The contact mechanism is divided into a plurality of segments to generate an electric arc to generate a magnetic field, and the magnetic field can magnetize the magnetism increasing piece 5 and the magnetism increasing block 51, so that the magnetism increasing piece 5 and the magnetism increasing block 51 generate a magnetic field in the corresponding grid sheet group 3, and the magnetic field generated by the magnetism increasing piece 5 and the magnetism increasing block 51 interacts with an electromagnetic field formed by the electric arc, thereby facilitating the electric arc to quickly flow to the grid sheet group 3 and be divided and extinguished.

The first arc striking plate 61 is located between the arc extinguishing chamber a and the breaking position of the moving contact 71 and is used for striking an arc, as shown in fig. 3, 5 and 6, the first arc striking plate 61 is located between the breaking position of the moving contact 71 and the first grid sheet group 31, the whole first arc striking plate 61 is in a plate-shaped structure, one end of the first arc striking plate 61 is located on the upper side of the first grid sheet group 31 and is parallel and opposite to the first arc extinguishing grid sheet 311 on the uppermost side of the first grid sheet group 31, and the other end of the first arc striking plate 61 is bent to be connected with the moving contact 71 located at the breaking position, so that the arc striking is facilitated. Of course, a second striking plate 62 (see fig. 15) for striking an arc may be provided between the stationary contact 72 and the third grid set 33, the second striking plate 62 being parallel-opposed to the third arc extinguishing grid 331 of the third grid set 33.

A second embodiment of an arc extinguishing device is provided in conjunction with fig. 7-10, which is the same as the first embodiment, and the arc extinguishing device comprises an arc extinguishing chamber a and a first arc striking plate 61, wherein the arc extinguishing chamber a comprises a pair of side plates 1 arranged at intervals, a space between the pair of side plates 1 forms an arc extinguishing cavity, a first grid plate group 31, a second grid plate group 32 and a third grid plate group 33 are arranged in the arc extinguishing cavity along a first direction, the first grid plate group 31 and the third grid plate group 33 are respectively arranged in an inclined manner along the first direction, the first arc extinguishing grid plate 311 and the third arc extinguishing grid plate 331 are respectively arranged in an inclined manner towards a contact mechanism, the first grid plate group 31 corresponds to a moving contact 71 in a breaking position, the third grid plate group 33 corresponds to a fixed contact 72, the second grid plate group 32 is arranged between the first grid plate group 31 and the third grid plate group 33, and the second arc extinguishing grid plate group 321 is arranged along a second direction.

Unlike the first embodiment, the arc extinguishing chamber a further includes a plurality of arc striking grids disposed between two adjacent grid groups 3, specifically as shown in fig. 9 and 10, a third arc striking grid 343 and a fourth arc striking grid 344 are disposed between the first grid group 31 and the second grid group 32, a fifth arc striking grid 345 and a sixth arc striking grid 346 are disposed between the second grid group 32 and the third grid group 33, wherein the fourth arc striking grid 344 and the fifth arc striking grid 345 are similar to a straight plate structure, the fourth arc striking grid 344 and the fifth arc striking grid 345 can be similar to the second arc striking grid 321 in size, the fourth arc striking grid 344 and the fifth arc striking grid 345 are respectively located at two opposite sides of the second grid group 32, the fourth arc striking grid 344 and the fifth arc striking grid 345 are respectively parallel to the second grid 321, the third arc striking grid 343 has an integral plate structure, one end of the third arc striking grid 344 is parallel to the first arc striking grid 311, the second arc striking grid 311 extends to the lower side of the third grid 31, and the third arc striking grid 343 extends to the opposite side of the third arc striking grid 311; one end of the sixth arc striking grid 346 is parallel to the third arc extinguishing grid 331, and in fig. 9 and 10, one end of the sixth arc striking grid 346 extends to the lower side of the third grid set 33 and is parallel to and opposite to the third arc extinguishing grid 331 at the lowest side of the third grid set 33, and the other end of the sixth arc striking grid 346 is bent toward the fifth arc striking grid 345.

As in the first embodiment, the electric arcs generated after the moving contact 71 and the fixed contact 72 are separated are divided into three sections of electric arcs by the three grid plate groups 3, each section of electric arcs respectively enter the first grid plate group 31, the second grid plate group 32 and the third grid plate group 33 and are gradually elongated, divided and cut off, the capacity of a single electric arc is reduced, the electric arcs are more favorably divided and extinguished by the grid plate groups 3, the electric arcs can flow between two adjacent grid plate groups 3 through the first arc striking grid plate 341 and the second arc striking grid plate 342, the mobility of the electric arcs is improved, and the arc extinguishing capacity is further improved.

In this embodiment, the side of each side plate 1 near the contact mechanism is provided with the same housing sidewall 2 as the first embodiment, the arc extinguishing chamber a further comprises the same gas generating member 4 and the same magnetism increasing member 5 as the first embodiment, wherein the structures and assembly modes of the gas generating member 4, the magnetism increasing member 5 and the housing sidewall 2 are the same as the first embodiment, the gas generating member 4 and the housing sidewall 2 are also provided with an air flow channel a1 in a matched manner, but no magnetism increasing block 51 is provided in this embodiment; the first arc striking plate 61 is located between the breaking position of the movable contact 71 and the first grid group 31, and the first arc striking plate 61 may have the same structure as the first embodiment.

In connection with fig. 11-15, a third embodiment of an arc extinguishing device is provided, which comprises an arc extinguishing chamber a, a first arc striking plate 61 and a second arc striking plate 62, wherein the arc extinguishing chamber a comprises an arc extinguishing chamber and a first grid plate group 31, a second grid plate group 32 and a third grid plate group 33 assembled in the arc extinguishing chamber, in this embodiment, the arc extinguishing chamber a comprises a pair of side plates 1 arranged at intervals, a space between the two side plates 1 is taken as the arc extinguishing chamber, the first grid plate group 31, the second grid plate group 32 and the third grid plate group 33 are assembled between the pair of side plates 1 along a first direction, and the moving contact 71 performs opening and closing swing at an opening of the arc extinguishing chamber, that is, the moving contact 71 is separated from or contacted with the fixed contact 72 along the first direction.

As shown in fig. 10, the first gate group 31 is correspondingly disposed at the breaking position of the moving contact 71, where the first gate group 31 includes a plurality of first arc-extinguishing gate plates 311 disposed at intervals along the second direction, preferably, the first arc-extinguishing gate plates 311 are disposed obliquely along the second direction, and the first arc-extinguishing gaps between two adjacent first arc-extinguishing gate plates 311 have a structure with one thick end and one thin end, so that the whole first gate group 31 approximates to a fan-shaped structure, the thin end of the first arc-extinguishing gap faces the contact mechanism, and the extension of the first arc-extinguishing gate plates 311 is limited by the width of the side plate 1, but the oblique arrangement and the fan-shaped structure are formed, so that the size of the first arc-extinguishing gate plates 311 can be increased as much as possible in a limited space.

The second grating group 32 includes a plurality of second arc-extinguishing grating plates 321 arranged at intervals, the extending direction of the second arc-extinguishing grating plates 321 forms an included angle with the first direction, preferably, the second grating group 32 includes at least two second sub-grating plate groups 332a arranged at intervals along the first direction, the inclination angles of the second arc-extinguishing grating plates 321 of the second sub-grating plate groups 332a adjacent to the third grating plate group 33 are different from each other, in this embodiment, the second grating plate group 32 includes two second sub-grating plate groups 332a arranged along the first direction, in fig. 13 and 15, the inclination angles of the second arc-extinguishing grating plates 321 of the second sub-grating plate groups 332a adjacent to the first grating plate group 31 are smaller, and one end of the second arc-extinguishing grating plate 321 in the second sub-grating plate group 332a adjacent to the third grating plate group 33 is slightly inclined towards the direction close to the contact mechanism, and the second arc-extinguishing plate group 332a adjacent to the third grating plate group 33 is inclined towards the second end, so that the second arc-extinguishing plate 321 in the second sub-grating plate groups can be inclined towards the second direction, and the second grating plate groups 332a can be inclined towards the same direction, and the second arc-extinguishing plate groups can be limited by the second arc-extinguishing plate groups 321 in the same direction, and the width can be limited by the second direction, and the two grating plate groups can be inclined towards the second side plate groups, and the second arc-extinguishing plate groups.

The third grid plate group 33 is arranged corresponding to the fixed contact 72, and the third grid plate group 33 comprises a plurality of third arc-extinguishing grid plates 331 which are obliquely arranged along the first direction, so that one end of each third arc-extinguishing grid plate 331 is obliquely oriented to the contact mechanism, that is, one end of each adjacent two third arc-extinguishing gaps is obliquely oriented to the contact mechanism, one end, close to the second grid plate group 32, of each third arc-extinguishing grid plate 331 is obliquely arranged towards one side, close to the fixed contact 72, of each third arc-extinguishing grid plate 331 in fig. 13 and 15, and the third arc-extinguishing grid plates 331 can extend in the first direction, thereby being beneficial to increasing the size of each third arc-extinguishing grid plate 331 and improving the arc-extinguishing efficiency.

Preferably, a seventh arc striking grid piece 347 is disposed between the first grid piece group 31 and the adjacent second sub-grid piece group 332a, specifically as shown in fig. 13 and 15, the seventh arc striking grid piece 347 has an L-shaped plate structure as a whole, one end of the seventh arc striking grid piece 347 is parallel and opposite to the first arc extinguishing grid piece 311, the other end of the seventh arc striking grid piece 347 is parallel and opposite to the second arc extinguishing grid piece 321 of the adjacent second sub-grid piece group 332a, that is, in fig. 15, the other end of the seventh arc striking grid piece 347 extends to the upper side of the adjacent second sub-grid piece group 332a and is parallel and opposite to the second arc extinguishing grid piece 321 located at the uppermost side; an eighth arc striking grid 348 is arranged between the third grid set 33 and the adjacent second sub-grid set 332a, in fig. 15, the eighth arc striking grid 348 is in a Z-shaped plate structure, one end of the eighth arc striking grid 348 is parallel to the third arc extinguishing grid 331, that is, one end of the eighth arc striking grid 348 extends to the lower side of the third grid set 33 and is parallel to and opposite to the third arc extinguishing grid 331 at the lowest side, and the other end of the eighth arc striking grid 348 is parallel to the second arc extinguishing grid 321 of the adjacent second sub-grid set 332a, that is, the other end of the eighth arc striking grid 348 extends to the upper side of the adjacent second sub-grid set 332a and is parallel to and opposite to the second arc extinguishing grid 321 at the uppermost side; further, a ninth striking grid 349 is disposed between two adjacent second sub-grid groups 332a, in fig. 15, the ninth striking grid 349 is an integrally formed U-shaped body, two ends of the ninth striking grid 349 are respectively bent and extended to be parallel to the second arc-extinguishing grid 321 of the two adjacent second sub-grid groups 332a, in this embodiment, the ninth striking grid 349 is located between the two second sub-grid groups 332a, two ends of the ninth striking grid 349 respectively extend to the lower sides of the two second sub-grid groups 332a, and are respectively parallel to and opposite to the lowest second arc-extinguishing grid 321 of each second sub-grid group 332 a.

The electric arc generated after the moving contact 71 and the fixed contact 72 are separated is divided into a plurality of sections of electric arcs by the first grid sheet group 31, the at least two second grid sheet groups 332a and the third grid sheet group 33, each section of electric arc is respectively elongated and cut off gradually, the capacity of a single electric arc is reduced, the electric arc is more favorably divided and extinguished by the grid sheet group 3, the electric arc can flow through the seventh arc striking grid sheet 347, the eighth arc striking grid sheet 348 and the ninth arc striking grid sheet 349, the mobility of the electric arc is improved, and the arc extinguishing capacity is further improved.

Further, the arc extinguishing chamber a further includes a gas generating member 4 and a magnetism enhancing member 5, as shown in fig. 11-14, a pair of gas generating members 4 are respectively and correspondingly assembled at two sides of the opening of the arc extinguishing chamber, that is, a pair of gas generating members 4 are assembled between a pair of side plates 1, each gas generating member 4 is respectively and fixedly connected with one side plate 1, the side wall 2 of the housing is not required to be arranged in this embodiment, and correspondingly, an air flow channel a1 communicated with the arc extinguishing chamber is not required to be arranged, so that the assembling process is simplified, the structure is simpler and more compact, and more occupied space is avoided; in this embodiment, as shown in fig. 14, the magnetism increasing members 5 are disposed on two sides of the arc extinguishing chamber along the first direction, and in preferred embodiments, the magnetism increasing members 5 are disposed on a side of the gas generating member 4 opposite to the arc extinguishing chamber, and a mounting groove 41 (see fig. 13) is preferably disposed on a side of the gas generating member 4 opposite to the arc extinguishing chamber, and each magnetism increasing member 5 is correspondingly assembled in the mounting groove 41, and may be fixed in the mounting groove 41 by adopting a screw fixing or other assembling modes.

The first arc striking plate 61 and the second arc striking plate 62 are correspondingly arranged between the arc extinguishing chamber a and the contact mechanism, as shown in fig. 13 and 15, the first arc striking plate 61 is positioned between the breaking position of the moving contact 71 and the first grid sheet group 31, the whole first arc striking plate 61 is in a plate-shaped structure, one end of the first arc striking plate 61 is positioned at one side of the first grid sheet group 31 far away from the second grid sheet group 32 and is parallel and opposite to the first arc extinguishing grid sheet 311 at the most edge of the first grid sheet group 31, and the other end of the first arc striking plate 61 is bent and connected with the moving contact 71 at the breaking position, namely the upper end of the first arc striking plate 61 is bent and opposite to the moving contact 71 in the drawing, so that arc striking is facilitated; as shown in fig. 15, the second arc striking plate 62 is integrally provided between the fixed contact 72 and the third grid set 33 in a plate-like structure, and the second arc striking plate 62 is parallel to and opposite to the third arc extinguishing grid 331 of the third grid set 33, so as to facilitate the introduction of the arc generated by breaking the contact mechanism into the arc extinguishing chamber a.

A fourth embodiment of an arc extinguishing device is provided in connection with fig. 16-20, the arc extinguishing device comprising an arc extinguishing chamber a and a first striking plate 61, the arc extinguishing chamber a comprising an arc extinguishing chamber and a first grating sheet group 31, a second grating sheet group 32 and a third grating sheet group 33 assembled in the arc extinguishing chamber, the arc extinguishing chamber a comprising a pair of side plates 1 arranged at intervals as an arc extinguishing chamber as in the third embodiment, the first grating sheet group 31, the second grating sheet group 32 and the third grating sheet group 33 being assembled between the pair of side plates 1 in a first direction, the moving contact 71 being subjected to opening and closing swinging at an opening of the arc extinguishing chamber, i.e. the moving contact 71 being separated from or in contact with the stationary contact 72 substantially in the first direction.

As shown in fig. 20, the first grid set 31 is correspondingly disposed at a breaking position of the moving contact 71, the first grid set 31 includes a plurality of first arc extinguishing grid plates 311 disposed at intervals along a first direction, and one end of the first arc extinguishing grid plates 311 adjacent to the second grid set 32 is inclined toward the contact mechanism; the third grid set 33 is arranged corresponding to the fixed contact 72, the second grid set 32 is located between the first grid set 31 and the third grid set 33, the third grid set 33 comprises a plurality of parallel and opposite third arc-extinguishing grid plates 331 at intervals, the second grid set 32 comprises a plurality of parallel and opposite second arc-extinguishing grid plates 321 at intervals, the second arc-extinguishing grid plates 321 and the third arc-extinguishing grid plates 331 are parallel to each other, and the second arc-extinguishing grid plates 321 and the third arc-extinguishing grid plates 331 are all inclined towards the contact mechanism. In this embodiment, the extension of the first arc-extinguishing gate 311 is not limited by the width of the side plate 1, the second arc-extinguishing gate 321 and the third arc-extinguishing gate 331 are inclined to be beneficial to increase the size, in the figure, the size of the second arc-extinguishing gate 321 is the largest, and then the size of the third arc-extinguishing gate 331, the size of the first arc-extinguishing gate 311 is the smallest, in this embodiment, the second gate group 32 includes two groups of second arc-extinguishing gate 321 with different specifications, and of course, the second arc-extinguishing gate 321 with the same specification can also be adopted.

In this embodiment, no arc striking grid is disposed between the two grid groups 3, so that as many arc extinguishing grid sheets as possible can be disposed in the arc extinguishing chamber a, so as to improve arc extinguishing efficiency.

As in the third embodiment, the arc extinguishing chamber a further includes a gas generating member 4 and a magnetism enhancing member 5, as shown in fig. 16 to 19, a pair of gas generating members 4 are respectively and correspondingly assembled at two sides of the opening of the arc extinguishing chamber, that is, a pair of gas generating members 4 are assembled between a pair of side plates 1, each gas generating member 4 is respectively and fixedly connected with one side plate 1, the magnetism enhancing member 5 is disposed at two sides of the arc extinguishing chamber along the first direction, in this embodiment, the magnetism enhancing member 5 is disposed at one side of the gas generating member 4 facing away from the arc extinguishing chamber, and a mounting groove 41 for assembling the magnetism enhancing member 5 is disposed at one side of each gas generating member 4 facing away from the arc extinguishing chamber.

As in the first embodiment, the first striking plate 61 is located between the arc extinguishing chamber a and the breaking position of the moving contact 71 for striking an arc, and as shown in fig. 16 and 18, the first striking plate 61 is located between the breaking position of the moving contact 71 and the first grid set 31, the first striking plate 61 is in a plate-like structure as a whole, and one end of the first striking plate 61 is located on the upper side of the first grid set 31 and is parallel and opposite to the first arc extinguishing grid 311 on the uppermost side of the first grid set 31. Of course, a second striking plate 62 for striking an arc may also be provided between the stationary contact 72 and the third grid set 33.

A circuit breaker comprises a shell, wherein a contact mechanism is arranged in the shell, and the arc extinguishing devices of the four embodiments are matched and arranged on one side of the contact mechanism.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (14)

1. The arc extinguishing device comprises an arc extinguishing chamber (a), wherein the arc extinguishing chamber (a) is matched with a contact mechanism and assembled in a shell together, and the arc extinguishing chamber (a) comprises an arc extinguishing cavity and a plurality of grid sheet groups (3), and is characterized in that: the first grating group (31), the second grating group (32) and the third grating group (33) are sequentially arranged along the first direction of the arc extinguishing cavity, the first grating group (31), the second grating group (32) and the third grating group (33) respectively comprise a plurality of first arc extinguishing grating plates (311), second arc extinguishing plates (321) and third arc extinguishing plates (331) which are arranged at intervals, the extending directions of the first arc extinguishing plates (311) and the second arc extinguishing plates (321) form an included angle, and the extending directions of the first arc extinguishing plates (311) and the second direction form an included angle, and the second direction is perpendicular to the first direction.

2. The arc extinguishing device according to claim 1, wherein: the arc extinguishing chamber (a) further comprises a magnetism increasing piece (5) matched with the grid sheet group (3), the magnetism increasing piece (5) is arranged on the side wall of the arc extinguishing chamber along a first direction, and the first direction is the length direction of the arc extinguishing chamber.

3. The arc extinguishing device according to claim 1, wherein: the arc extinguishing chamber (a) comprises a pair of gas generating pieces (4), each gas generating piece (4) is correspondingly assembled on two sides of an opening of the arc extinguishing chamber, and a mounting groove (41) for assembling the magnetism increasing piece (5) is formed in one side of the gas generating piece (4) back to the arc extinguishing chamber.

4. The arc suppressing apparatus according to claim 3, wherein: the arc extinguishing chamber (a) comprises a pair of side plates (1) which are arranged at intervals, a plurality of grid sheet groups (3) are assembled in the space between the pair of side plates (1) as an arc extinguishing chamber, one side, close to a contact mechanism, of each side plate (1) is provided with a housing side wall (2), two housing side walls (2) are spaced to form an opening of the arc extinguishing chamber relatively, one side, opposite to the arc extinguishing chamber, of each housing side wall (2) is provided with a gas generating part (4), an air flow channel (a 1) for communicating the arc extinguishing chamber is formed between each gas generating part (4) and each housing side wall (2), the air flow channel (a 1) extends along a third direction, and the third direction, the second direction and the first direction are perpendicular to each other.

5. The arc suppressing apparatus according to any one of claims 1 to 4, wherein: also comprises a first arc striking plate (61) and/or a second arc striking plate (62) which are arranged between the arc extinguishing chamber (a) and the contact mechanism,

the contact mechanism comprises a moving contact (71) and a fixed contact (72) which are matched with each other, the first grid sheet group (31) corresponds to the breaking position of the moving contact (71), one end of the first arc striking plate (61) extends to one side of the first grid sheet group (31) and is parallel and opposite to the first arc extinguishing grid sheet (311),

the third grid plate group (33) is arranged corresponding to the fixed contact (72), and one end of the second arc striking plate (62) extends to one side of the third grid plate group (33) and is parallel and opposite to the third arc extinguishing grid plate (331).

6. The arc suppressing apparatus according to claim 5, wherein: the arc extinguishing chamber (a) further comprises at least one arc striking grid sheet, and the arc striking grid sheet is positioned between two adjacent grid sheet groups (3) and used for striking an arc.

7. The arc suppressing apparatus according to claim 6, wherein: the second arc-extinguishing grid plates (321) are arranged along the second direction, the first arc-extinguishing grid plates (311) and the third arc-extinguishing grid plates (331) are respectively arranged obliquely along the first direction, and the first arc-extinguishing grid plates (311) and the third arc-extinguishing grid plates (331) are obliquely oriented to the contact mechanism.

8. The arc suppressing apparatus according to claim 7, wherein: a first arc striking grid sheet (341) is arranged between the first grid sheet group (31) and the second grid sheet group (32), and two ends of the first arc striking grid sheet (341) are respectively parallel to the first arc extinguishing grid sheet (311) and the second arc extinguishing grid sheet (321);

a second arc striking grid sheet (342) is arranged between the second grid sheet group (32) and the third grid sheet group (33), and two ends of the second arc striking grid sheet (342) are respectively parallel to the second arc extinguishing grid sheet (321) and the third arc extinguishing grid sheet (331).

9. The arc suppressing apparatus according to claim 8, wherein: the arc extinguishing chamber (a) further comprises a magnetism increasing block (51), wherein the magnetism increasing block (51) corresponds to between the second grid sheet group (32) and the third grid sheet group (33) and is positioned on one side of the second arc striking grid sheet (342) opposite to the contact mechanism.

10. The arc suppressing apparatus according to claim 7, wherein: third arc striking grid pieces (343) and fourth arc striking grid pieces (344) are arranged between the first grid piece group (31) and the second grid piece group (32), fifth arc striking grid pieces (345) and sixth arc striking grid pieces (346) are arranged between the second grid piece group (32) and the third grid piece group (33), the fourth arc striking grid pieces (344) and the fifth arc striking grid pieces (345) are respectively located on two opposite sides of the second grid piece group (32), the fourth arc striking grid pieces (344) and the fifth arc striking grid pieces (345) are respectively parallel to the second arc extinguishing grid pieces (321), one end of the third arc striking grid pieces (343) are parallel to the first arc extinguishing grid pieces (311), the other end of the third arc striking grid pieces are bent towards the fourth arc striking grid pieces (344), one end of the sixth arc striking grid pieces (346) are parallel to the third arc extinguishing grid pieces (331), and the other end of the sixth arc striking grid pieces (346) are bent towards the fifth arc striking grid pieces (345).

11. The arc suppressing apparatus according to claim 5, wherein: the first arc-extinguishing grid plates (311) are obliquely arranged along the second direction, the second arc-extinguishing grid plates (321) and the third arc-extinguishing grid plates (331) are obliquely arranged along the first direction respectively, and the first arc-extinguishing grid plates (311) and the third arc-extinguishing grid plates (331) are obliquely oriented to the contact mechanism respectively.

12. The arc suppressing apparatus according to claim 11, wherein: the second grid plate group (32) comprises at least two second sub grid plate groups (332 a) which are arranged at intervals along the first direction, a seventh arc striking grid plate (347) is arranged between the first grid plate group (31) and the adjacent second sub grid plate groups (332 a), one end of the seventh arc striking grid plate (347) is parallel and opposite to the first arc extinguishing grid plate (311), and the other end of the seventh arc striking grid plate is parallel and opposite to the second arc extinguishing grid plate (321) of the adjacent second sub grid plate groups (332 a);

an eighth arc striking grid sheet (348) is arranged between the third grid sheet group (33) and the adjacent second sub-grid sheet group (332 a), one end of the eighth arc striking grid sheet (348) is parallel and opposite to the third arc extinguishing grid sheet (331), and the other end of the eighth arc striking grid sheet is parallel and opposite to the second arc extinguishing grid sheet (321) of the adjacent second sub-grid sheet group (332 a);

a ninth arc striking grid sheet (349) is arranged between two adjacent second sub-grid sheet groups (332 a), and two ends of the ninth arc striking grid sheet (349) are respectively opposite to the second arc extinguishing grid sheets (321) of the two adjacent second sub-grid sheet groups (332 a) in parallel.

13. The arc suppressing apparatus according to claim 5, wherein: the first arc-extinguishing grid plates (311) are obliquely arranged along a first direction, the second arc-extinguishing grid plates (321) and the third arc-extinguishing grid plates (331) are obliquely arranged along a second direction respectively, and the second arc-extinguishing grid plates (321) and the third arc-extinguishing grid plates (331) are parallel to each other.

14. The circuit breaker, including the shell and set up the contact mechanism in the shell, its characterized in that: an arc extinguishing device according to any one of claims 1-13 is cooperatively arranged on one side of the contact mechanism.