CN220710227U - Arc extinguishing assembly and circuit breaker - Google Patents

Abstract

The application discloses an arc extinguishing assembly and a circuit breaker, wherein the arc extinguishing assembly is arranged between a contact assembly and a total air outlet of the circuit breaker and comprises an arc striking assembly; the arc extinguishing chamber is electrically connected with the contact assembly through the arc striking assembly and is used for extinguishing an arc formed by the contact assembly; the anti-breakdown piece is arranged between the arc extinguish chamber and the total air outlet and comprises a flow dividing piece and a buffer piece, the flow dividing piece is provided with a plurality of exhaust hole groups which are arranged separately, the buffer piece comprises a plurality of buffer chambers which are arranged in an array, each exhaust hole group is arranged corresponding to one buffer chamber, and the exhaust hole groups are used for introducing air flow formed by the arc extinguish chamber into the corresponding buffer chambers. The arc extinguishing component and the circuit breaker can prevent the air current passing through the arc extinguishing chamber from breaking down again, and the circuit breaker is protected from being influenced by flashover.

Description

Arc extinguishing assembly and circuit breaker

Technical Field

The application belongs to electrical equipment technical field, especially relates to an arc extinguishing subassembly and circuit breaker.

Background

The breaker can produce electric arc in its breaking process, and the electric arc forms the air current that has metal ion after the explosion chamber of circuit breaker, and high Wen Daidian's metal ion can break away from the circuit breaker, forms the flashover outside the circuit breaker, and the flashover can produce the influence to the circuit breaker, causes the circuit breaker and the burnout of circuit breaker external circuit and equipment.

At present, in order to solve the influence of the arcing of the circuit breaker, a buffer space communicated with the arc extinguishing chamber is usually added behind the arc extinguishing chamber, and a baffle is arranged in the buffer space, so that the air flow with metal particles is cooled and energy is attenuated in the buffer space, and the arcing is prevented from being separated from the circuit breaker. However, in the current arc extinguishing mode, after all the air flows formed after passing through the arc extinguishing chamber enter the buffer space, the air flows with metal particles can be broken down again, so that the electric arcs are regenerated and discharged out of the circuit breaker, and the circuit breaker is influenced.

Disclosure of Invention

The application provides an arc extinguishing subassembly and circuit breaker can prevent to break down again through the air current of explosion chamber, protects the circuit breaker not receive the flashover influence.

The application provides an arc extinguishing subassembly, wherein locates between the contact subassembly and the total gas outlet of circuit breaker, and arc extinguishing subassembly includes: an arc striking assembly; the arc extinguishing chamber is electrically connected with the contact assembly through the arc striking assembly and is used for extinguishing an arc formed by the contact assembly; the anti-breakdown piece is arranged between the arc extinguish chamber and the total air outlet and comprises a flow dividing piece and a buffer piece, the flow dividing piece is provided with a plurality of exhaust hole groups which are arranged separately, the buffer piece comprises a plurality of buffer chambers which are arranged in an array, each exhaust hole group is arranged corresponding to one buffer chamber, and the exhaust hole groups are used for introducing air flow formed by the arc extinguish chamber into the corresponding buffer chambers.

The arc extinguishing assembly comprises a plurality of buffer chambers, wherein the buffer chambers are divided into a plurality of rows of buffer chambers which are distributed along a first direction, a first partition plate is arranged between every two adjacent rows of buffer chambers, the buffer chambers in each row are sequentially distributed along a second direction, a second partition plate is arranged between every two adjacent buffer chambers in each row, and the first partition plate and the second partition plate are all insulating plates.

The arc extinguishing assembly comprises at least one arc striking sheet and a plurality of grid sheets, wherein the arc striking sheets and the grid sheets are arranged in the arc extinguishing chamber, the grid sheets are arranged in parallel, a passing space for passing through an electric arc and an air current is arranged between the adjacent grid sheets, the arc striking sheets are arranged between the grid sheets and protrude out of the grid sheets towards the contact assembly, the arc striking sheets are arranged corresponding to the first separation plates, and the arc striking sheets and the corresponding first separation plates are positioned in the same plane.

The arc extinguishing assembly comprises an arc striking head and two extending sheets, wherein the arc striking head is of an arc structure and protrudes out of the plurality of grid sheets, two ends of the arc striking head are respectively connected with the two extending sheets, the two extending sheets are arranged parallel to the grid sheets, and a passing space is reserved between each extending sheet and the adjacent grid sheet.

The arc extinguishing assembly comprises an arc extinguishing assembly, wherein the exhaust hole group comprises a plurality of exhaust holes which are arranged at intervals along a first direction, the flow dividing piece comprises a plurality of guide parts, each guide part and one exhaust hole are correspondingly arranged, the guide parts and the exhaust holes corresponding to the guide parts are arranged side by side along a second direction, and the guide parts are wedge-shaped structural members which are obliquely arranged towards the exhaust holes corresponding to the guide parts.

The arc extinguishing assembly comprises a buffer chamber, wherein the buffer chamber is provided with a buffer air inlet and a buffer air outlet along the third direction, the buffer air inlet is communicated with the exhaust hole group, the buffer air outlet is communicated with the total air outlet, a plurality of buffer sheets are arranged in the buffer chamber at intervals along the third direction, the buffer sheets are protruded out of the inner surfaces of the side walls of the buffer chamber which are oppositely arranged, the adjacent buffer sheets are protruded out of the side walls of the buffer chamber, and at least part of projections of the adjacent buffer sheets are overlapped on a plane perpendicular to the third direction.

The arc extinguishing assembly comprises a buffer piece, wherein the buffer piece comprises a plurality of arc extinguishing nets, the arc extinguishing nets are arranged in a one-to-one correspondence with the buffer chambers, and the arc extinguishing nets are arranged in the corresponding buffer chambers and are used for eliminating ionization of air flow in the buffer chambers.

The arc extinguishing assembly comprises an arc extinguishing chamber, an arc splitting piece, an arc extinguishing assembly and a breakdown preventing piece, wherein the breakdown preventing piece further comprises a breakdown preventing block, and the breakdown preventing block is arranged between the arc extinguishing chamber and the flow dividing piece and used for preventing the gas flow from breaking down after being separated from the arc extinguishing chamber.

The arc extinguishing assembly comprises a buffer piece and a plurality of guide walls, wherein the buffer piece is provided with a plurality of buffer air outlets and a plurality of guide walls, the plurality of buffer air outlets are all communicated with the total air outlet, the plurality of guide walls are connected between the buffer air outlets and the buffer chambers at preset angles, and the plurality of buffer chambers are communicated with the plurality of buffer air outlets through the guide walls.

On the other hand, the application also provides a circuit breaker, wherein, the circuit breaker includes contact assembly, total gas outlet and foretell arc extinguishing subassembly.

The utility model provides an arc extinguishing subassembly includes arc striking subassembly, explosion chamber and anti-puncture piece, when the circuit breaker breaks up, contact assembly release electric arc, because explosion chamber passes through arc striking subassembly and contact assembly electrical connection, under the striking effect of arc striking subassembly, the electric arc gets into the explosion chamber and carries out the arc extinction, form the air current that contains charged metal particles after the arc extinction, the air current separates into the multistrand air current after the exhaust group that sets up through a plurality of divisions of diverging piece, every air current all contains a small amount of charged metal particles, make every air current get into the buffer chamber that corresponds under the guide of exhaust group and cushion when buffering, the phenomenon that the air current that contains a large amount of charged metal particles breaks down again forms the flashover can not appear, after the air current after the buffer chamber elimination charged metal particles is discharged the circuit breaker by total gas outlet, can not exist the flashover and produce the influence to the circuit breaker, consequently, the explosion subassembly of this application can produce the protection effect to the circuit breaker.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.

Fig. 1 is a cross-sectional view of an arc chute assembly according to an embodiment of the present application;

fig. 2 is an isometric view of a break-through prevention member of an arc chute assembly according to an embodiment of the present application;

fig. 3 is a side view of a buffer member of an arc extinguishing assembly of an embodiment of the present application;

fig. 4 is a schematic structural diagram of an arc extinguishing assembly according to an embodiment of the present application;

fig. 5 is a first distribution of buffer sheets in a buffer chamber of an arc extinguishing assembly according to an embodiment of the present application;

fig. 6 is a second distribution of buffer sheets in a buffer chamber of an arc extinguishing assembly according to an embodiment of the present application;

fig. 7 is a third distribution of buffer sheets in a buffer chamber of an arc extinguishing assembly according to an embodiment of the present application;

fig. 8 is a fourth distribution of buffer sheets in a buffer chamber of an arc extinguishing assembly according to an embodiment of the present application;

fig. 9 is an exploded view of an arc chute assembly according to another embodiment of the present application;

fig. 10 is a cross-sectional view of an arc extinguishing assembly according to another embodiment of the present application.

Reference numerals illustrate:

10. an arc extinguishing assembly; 20. a contact assembly; 30. a total air outlet; 40. an arc striking assembly; 41. a first arc striking member; 42. a second arc striking member; 50. an arc extinguishing chamber; 51. an arc striking piece; 511. an arc striking head; 512. an extension piece; 52. a grid sheet; 53. a passing space; 60. an anti-puncture member; 61. a shunt; 611. an exhaust hole group; 612. an exhaust port; 613. a guide part; 62. a buffer member; 621. a buffer chamber; 622. a first partition plate; 623. a second partition plate; 624. a buffer sheet; 625. a buffer air inlet; 626. a buffer air outlet; 627. eliminating free net; 628. a drainage wall; 63. an anti-punch-through block;

x, a first direction; y, second direction; z, third direction.

Detailed Description

Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present application more apparent, and to further describe the present application in conjunction with the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.

As shown in fig. 1 to 4, the embodiment of the present application provides an arc extinguishing assembly, wherein the arc extinguishing assembly is disposed between a contact assembly 20 and a total air outlet 30 of a circuit breaker, when the circuit breaker is broken, the contact assembly 20 acts and releases an arc to the arc extinguishing assembly 10, the arc forms an air flow containing charged metal particles after being extinguished by the arc extinguishing assembly 10, and the air flow is discharged out of the circuit breaker through the total air outlet 30, thereby completing the arc extinguishing process of the whole circuit breaker.

The arc extinguishing assembly 10 includes an arc striking assembly 40; the arc extinguishing chamber 50, the arc extinguishing chamber 50 is electrically connected with the contact assembly 20 through the arc striking assembly 40, and the arc extinguishing chamber 50 is used for extinguishing an arc formed by the contact assembly 20; the anti-breakdown piece 60 is arranged between the arc extinguishing chamber 50 and the total air outlet 30, the anti-breakdown piece 60 comprises a flow dividing piece 61 and a buffer piece 62, the flow dividing piece 61 is provided with a plurality of exhaust hole groups 611 which are arranged in a separated mode, the buffer piece 62 comprises a plurality of buffer chambers 621 which are arranged in an array mode, each exhaust hole group 611 is arranged corresponding to one buffer chamber 621, and the exhaust hole groups 611 are used for introducing air flow formed by the arc extinguishing chamber 50 into the corresponding buffer chambers 621.

During implementation, the arc extinguishing assembly 10 of the present application includes the arc striking assembly 40, the explosion chamber 50 and the anti-breakdown piece 60, when the breaker breaks, the contact assembly 20 releases the arc, because the explosion chamber 50 is electrically connected with the contact assembly 20 through the arc striking assembly 40, under the striking effect of the arc striking assembly 40, the arc enters the explosion chamber 50 to extinguish the arc, the air current containing charged metal particles is formed after the arc is extinguished, after passing through the exhaust hole group 611 of the multiple separation setting of the dividing piece 61, the air current is divided into multiple air currents, each air current contains a small amount of charged metal particles, when each air current enters the corresponding buffer chamber 621 to buffer under the guidance of the exhaust hole group 611, the phenomenon that the air current containing a large amount of charged metal particles breaks down again to form the flashover does not appear, after the air current after the charged metal particles are eliminated by the buffer chamber 621 is discharged out of the breaker by the total air outlet 30, the flashover does not influence the breaker, therefore the arc extinguishing assembly 10 of the present application can produce the protection effect to the breaker.

As shown in fig. 3, in the arc extinguishing assembly according to the embodiment of the present application, the plurality of buffer chambers 621 are divided into a plurality of rows of buffer chambers 621 arranged along a first direction X, a first partition plate 622 is disposed between two adjacent rows of buffer chambers 621, the plurality of buffer chambers 621 in each row are sequentially arranged along a second direction Y, a second partition plate 623 is disposed between two adjacent buffer chambers 621 in each row, and the first partition plate 622 and the second partition plate 623 are both insulating plates. The first direction X is a vertical direction in fig. 3, the second direction Y is a horizontal direction in fig. 3, and the actual placement direction of the circuit breaker and the arc extinguishing assembly 10 is the same as the direction in fig. 3 during use.

In particular, the first partition plate 622 and the second partition plate 623 are arranged to separate the plurality of buffer chambers 621, so that each buffer chamber 621 has an independent space, and after the plurality of charged airflows enter the independent spaces respectively, the charged particles in the plurality of airflows do not interact due to the insulating plates of the first partition plate 622 and the second partition plate 623, so that the phenomenon of re-breakdown of the airflows is avoided, and the situation that the breaker is damaged due to flashover after the airflows are discharged from the breaker through the total air outlet 30 is avoided.

Specifically, the arc extinguishing assembly 10 includes four buffer chambers 621, and the four buffer chambers 621 are arranged in a two-row and two-column manner, so that the gas exhausted after arc extinguishing of the arc extinguishing chamber 50 can be cut into four parts, thereby avoiding the re-breakdown phenomenon of the gas flow.

As shown in fig. 4, in the arc extinguishing assembly according to the embodiment of the present application, at least one striking plate 51 and a plurality of grid plates 52 are disposed in the arc extinguishing chamber 50, the plurality of grid plates 52 are disposed in parallel, a passing space 53 for passing an arc and an air current is disposed between adjacent grid plates 52, the passing space 53 is disposed in communication with the air vent group 611, the striking plate 51 is disposed between the plurality of grid plates 52 and protrudes toward the contact assembly 20 and disposed on the plurality of grid plates 52, so that the arc can be guided to different directions, and thus the arc is split into different passing spaces 53, the striking plate 51 is disposed corresponding to the first partition plate 622, the striking plate 51 and the corresponding first partition plate 622 are disposed in the same plane, so that the arc can be split into two parts, one part of the arc reaches the passing space 53 corresponding to the buffer chamber 621 on one side of the first partition plate 622 and the air vent group 611, and the other part of the arc reaches the passing space 53 corresponding to the buffer chamber 621 on the other side of the first partition plate 622 and the air vent group 611, so as to avoid the phenomenon of re-strike between the arcs or the air currents on both sides of the first partition plate 622.

In particular, during the process of entering each passing space 53, the long arc is cut into multiple sections of short arcs by the multiple grid plates 52, the short arcs enter the corresponding passing spaces 53, the complete arc extinguishing operation is completed, and the gas after arc extinguishing enters the buffer chamber 621 through the exhaust hole group 611 for buffering, so that the re-breakdown of the gas flow is avoided.

As shown in fig. 4, in the arc extinguishing assembly of the embodiment of the present application, the arc striking piece 51 includes an arc striking head 511 and two extending pieces 512, the arc striking head 511 is in an arc structure and protrudes out of the plurality of grid pieces 52, two ends of the arc striking head 511 are respectively connected with the two extending pieces 512, the two extending pieces 512 are all arranged parallel to the grid pieces 52, and a passing space 53 is provided between the extending piece 512 and the adjacent grid piece 52.

In particular, before the electric arc enters the passing space 53, the arc striking head 511 protrudes from the plurality of grid plates 52, so that the electric arc firstly contacts the arc striking head 511 of the arc striking plate 51, and is divided into two sections of electric arcs under the guidance of the arc striking head 511 of the arc structure, the two sections of electric arcs respectively enter the passing space along the extending direction of the extending plates 512 under the guidance of the two extending plates 512, and finally arc extinction is obtained, and the gas after arc extinction also respectively reaches each buffer chamber 621 at two sides of the first partition plate 622 to be buffered, so that the arc striking plate 51 has the effects of guiding and dividing the electric arc in the arc extinction process of the electric arc.

Alternatively, the striking head 511 may be formed of two striking plates having a predetermined included angle, and the connection portions of the two striking plates are disposed toward the contact assembly 20, so that the long arc can be accurately and uniformly divided.

Specifically, the striking assembly 40 includes a first striking member 41 and a second striking member 42, where the first striking member 41 and the second striking member 42 are respectively disposed on two sides of the contact assembly 20 along the first direction X and are electrically connected to the contact assembly 20, the first striking member 41 is used for guiding a part of the electric arc generated by the contact assembly 20 into a plurality of passing spaces 53 above the striking plate 51, and the second striking member 42 is used for guiding a part of the electric arc generated by the contact assembly 20 into a plurality of passing spaces 53 below the striking plate 51.

As shown in fig. 2, in the arc extinguishing assembly according to the embodiment of the present application, the exhaust hole group 611 includes a plurality of exhaust ports 612 that are spaced along the first direction X, the splitter 61 includes a plurality of guide portions 613, each guide portion 613 is disposed corresponding to one exhaust port 612, the guide portions 613 and the exhaust ports 612 corresponding to themselves are disposed side by side along the second direction Y, and the guide portions 613 are wedge-shaped structures that are disposed obliquely toward the exhaust ports 612 corresponding to themselves.

In particular, the guide portion 613 can guide the gas discharged from the space 53 to the corresponding exhaust port 612, and the guide portion 613 is inclined toward the corresponding exhaust port 612, so that the gas is not guided to other exhaust ports 612 to interfere with each other.

Specifically, the guiding portion 613 is configured to guide gas to the corresponding exhaust ports 612 in the exhaust hole groups 611 adjacent to each other along the second direction Y, and one guiding portion 613 is disposed between two adjacent exhaust ports 612 along the first direction X, so that the two adjacent exhaust ports 612 can be separated from each other, and the situation that the gas is introduced into the adjacent exhaust ports 612 to interfere with each other is avoided.

As shown in fig. 4, in the arc extinguishing assembly of the embodiment of the present application, two sides of the buffer chamber 621 along the third direction Z are respectively provided with a buffer air inlet 625 and a buffer air outlet 626, the buffer air inlet 625 is communicated with the exhaust hole group 611, the buffer air outlet 626 is communicated with the total air outlet 30, a plurality of buffer sheets 624 are further disposed in the buffer chamber 621 at intervals along the third direction Z, the plurality of buffer sheets 624 are protruded on inner surfaces of opposite side walls of the buffer chamber 621, adjacent buffer sheets 624 are protruded on different side walls, and at least part of projections of the adjacent buffer sheets 624 are overlapped on a plane perpendicular to the third direction Z. Wherein the third direction Z is the horizontal direction in fig. 4.

In particular, the overlapping arrangement of the plurality of buffer sheets 624 makes the air flow from the buffer air inlet 625 to the buffer air outlet 626 along the S-shaped route in the process of passing through the buffer chamber 621, and during the flowing process, the air flow flowing into the buffer air inlet 625 along the third direction Z collides with the buffer sheets 624 protruding from the inner surface of the side wall of the buffer chamber 621, and the collision can reduce the electric arc in the air flow, so that the air flow can cool and extinguish the electric arc in the air flow after being buffered by the collision of the buffer sheets 624, and the temperature of the air flow can be reduced, so that the air flow is safely discharged out of the circuit breaker.

Alternatively, fig. 5 to 8 show different distributions of the plurality of buffer sheets 624, and in each of the different embodiments, an S-shaped channel is formed between the plurality of buffer sheets 624 in each buffer chamber 621 to allow gas to pass therethrough, and the arrow direction in fig. 5 to 8 is the direction of gas flow, and the gas contacts the buffer sheets 624 to collide and buffer during the flow. Note that the distribution of the plurality of buffer sheets 624 includes, but is not limited to, the distribution of fig. 5 to 8.

As shown in fig. 9 and 10, in another embodiment of the arc extinguishing assembly of the present application, the buffer member 62 further includes a plurality of dissociation nets 627, the plurality of dissociation nets 627 are disposed in one-to-one correspondence with the plurality of buffer chambers 621, and the dissociation nets 627 are disposed inside the corresponding buffer chambers 621 and are used for removing ionization to the air flow in the buffer chambers 621.

In specific implementation, the deionization net can filter the air flow in the corresponding buffer chamber 621, can generate a blocking effect on charged particles in the air flow, and avoids the charged particles from escaping from the circuit breaker along with the air flow, so that the effect of eliminating ionization is realized, and the damage to the circuit breaker is reduced.

As shown in fig. 9 and 10, the arc extinguishing assembly according to another embodiment of the present application further includes a breakdown preventing block 63, where the breakdown preventing block 63 is disposed between the arc extinguishing chamber 50 and the shunt 61, and is used for preventing the breakdown of the gas flow after the gas flow is separated from the arc extinguishing chamber 50. Furthermore, the anti-breakdown block 63 can prevent the arc from directly flying out of the arc-extinguishing chamber 50, and damage of the arcing to the circuit breaker is avoided.

In specific implementation, the charged gas after arc extinction by the arc extinguishing chamber 50 passes through the anti-breakdown block 63 and enters the corresponding buffer chamber 621 to be divided into a plurality of gas strands, and under the auxiliary effect of the dissociation net 627, the ionization of the gas can be eliminated, and the re-breakdown between the gases is avoided.

As shown in fig. 10, in the arc extinguishing assembly according to another embodiment of the present application, the buffer member 62 has a plurality of buffer air outlets 626 and a plurality of flow guiding walls 628, the plurality of buffer air outlets 626 are all disposed in communication with the total air outlet 30, the plurality of flow guiding walls 628 are connected between the buffer air outlets 626 and the buffer chambers 621 at a predetermined angle, and the plurality of buffer chambers 621 are in communication with the plurality of buffer air outlets 626 through the flow guiding walls 628.

In specific implementation, the circuit breaker is generally provided with a gas blocking member such as a fixing screw, for example, the fixing screw at the top of the circuit breaker in fig. 10, and the arc extinguishing assembly in another embodiment of the present application can drain the gas exhausted from the buffer chamber 621 to the buffer gas outlet 626 through the drainage wall 628, and the buffer gas outlet 626 is communicated with the total gas outlet 30, so that the gas cannot blow to the surface of the fixing screw, the influence of the gas on the fixing screw is avoided, the fixing screw can avoid the influence of flashover, and the service life of the fixing screw is ensured.

The embodiment of the application also provides a circuit breaker, wherein the circuit breaker comprises a contact assembly 20, a total air outlet 30 and the arc extinguishing assembly.

During specific implementation, the circuit breaker of this application embodiment includes arc extinguishing subassembly 10, arc extinguishing subassembly 10 includes arc striking subassembly 40, explosion chamber 50 and anti-puncture piece 60, when the circuit breaker breaks out, contact subassembly 20 release electric arc, because explosion chamber 50 passes through arc striking subassembly 40 and is connected with contact subassembly 20 electricity, under the striking effect of arc striking subassembly 40, electric arc gets into explosion chamber 50 and carries out the arc extinction, form the air current that contains charged metal particles after the arc extinction, the air current separates into the multistrand air current after the exhaust hole group 611 that sets up through a plurality of separations of dividing piece 61, every air current all contains a small amount of charged metal particles, when making every air current get into corresponding buffer chamber 621 under the guide of exhaust hole group 611 and cushion, the phenomenon that the air current that contains a large amount of charged metal particles breaks down again forms the flashover can not appear, after the air current after the buffer chamber 621 eliminates charged metal particles is discharged out the circuit breaker by total gas outlet 30, can not exist the flashover and produce the influence to the circuit breaker, consequently, the explosion subassembly 10 of this application can produce the protection effect to the circuit breaker.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

In the foregoing, only the specific embodiments of the present application are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, which are intended to be included in the scope of the present application.

Claims (10)

1. An arc extinguishing assembly characterized by being arranged between a contact assembly (20) and a total air outlet (30) of a circuit breaker, the arc extinguishing assembly (10) comprising:

an arc striking assembly (40);

the arc extinguishing chamber (50) is electrically connected with the contact assembly (20) through the arc striking assembly (40), and the arc extinguishing chamber (50) is used for extinguishing an arc formed by the contact assembly (20);

anti-breakdown piece (60) locates explosion chamber (50) with between total gas outlet (30), anti-breakdown piece (60) include reposition of redundant personnel piece (61) and bolster (62), reposition of redundant personnel piece (61) have a plurality of exhaust hole group (611) that separate the setting mutually, bolster (62) include a plurality of buffer chambers (621) that are the array and arrange, every exhaust hole group (611) with one buffer chamber (621) correspond the setting, exhaust hole group (611) are used for with the air current that explosion chamber (50) formed is introduced in corresponding buffer chamber (621).

2. The arc extinguishing assembly according to claim 1, wherein a plurality of the buffer chambers (621) are divided into a plurality of rows of the buffer chambers (621) arranged along a first direction (X), a first partition plate (622) is provided between two adjacent rows of the buffer chambers (621), the plurality of the buffer chambers (621) in each row are sequentially arranged along a second direction (Y), a second partition plate (623) is provided between two adjacent buffer chambers (621) in each row, and the first partition plate (622) and the second partition plate (623) are both insulating plates.

3. The arc extinguishing assembly according to claim 2, wherein at least one arc striking sheet (51) and a plurality of grid sheets (52) are arranged in the arc extinguishing chamber (50), a plurality of grid sheets (52) are arranged in parallel, a passing space (53) for passing through the arc and the air flow is arranged between the adjacent grid sheets (52), the passing space (53) is communicated with the exhaust hole group (611), the arc striking sheet (51) is arranged between the grid sheets (52) and protrudes out of the grid sheets (52) towards the contact assembly (20), the arc striking sheet (51) is arranged corresponding to the first partition plate (622), and the arc striking sheet (51) and the corresponding first partition plate (622) are in the same plane.

4. An arc extinguishing assembly according to claim 3, characterized in that the arc striking piece (51) comprises an arc striking head (511) and two extending pieces (512), the arc striking head (511) is of an arc structure and protrudes out of a plurality of grid pieces (52), two ends of the arc striking head (511) are respectively connected with the two extending pieces (512), the two extending pieces (512) are arranged in parallel with the grid pieces (52), and the passing space (53) is formed between the extending piece (512) and the adjacent grid pieces (52).

5. The arc extinguishing assembly according to claim 2, characterized in that the exhaust hole group (611) comprises a plurality of exhaust holes (612) arranged at intervals along a first direction (X), the flow dividing member (61) comprises a plurality of guide portions (613), each guide portion (613) and one exhaust hole (612) are arranged correspondingly, the guide portions (613) and the exhaust holes (612) corresponding to the guide portions (613) are arranged side by side along the second direction (Y), and the guide portions (613) are wedge-shaped structural members arranged obliquely towards the exhaust holes (612) corresponding to the guide portions.

6. The arc extinguishing assembly according to claim 1, wherein two sides of the buffer chamber (621) along a third direction (Z) are respectively provided with a buffer air inlet (625) and a buffer air outlet (626), the buffer air inlet (625) is communicated with the exhaust hole group (611), the buffer air outlet (626) is communicated with the total air outlet (30), a plurality of buffer sheets (624) are further arranged in the buffer chamber (621) at intervals along the third direction (Z), the buffer sheets (624) are protruded from inner surfaces of side walls of the buffer chamber (621) which are oppositely arranged, adjacent buffer sheets (624) are protruded from different side walls, and at least part of projections of the adjacent buffer sheets (624) are overlapped and arranged on a plane perpendicular to the third direction (Z).

7. The arc extinguishing assembly according to claim 1, wherein the buffer member (62) further comprises a plurality of dissociation nets (627), the plurality of dissociation nets (627) being arranged in one-to-one correspondence with the plurality of buffer chambers (621), the dissociation nets (627) being arranged inside the corresponding buffer chambers (621) for deionizing the gas flow in the buffer chambers (621).

8. The arc extinguishing assembly of claim 7, wherein the breakdown preventing member (60) further comprises a breakdown preventing block (63), the breakdown preventing block (63) being disposed between the arc extinguishing chamber (50) and the shunt member (61) for preventing breakdown of the gas flow after the gas flow is separated from the arc extinguishing chamber (50).

9. The arc extinguishing assembly according to claim 7, wherein the buffer member (62) has a plurality of buffer air outlets (626) and a plurality of flow guiding walls (628), a plurality of the buffer air outlets (626) are all disposed in communication with the total air outlet (30), a plurality of the flow guiding walls (628) are connected between the buffer air outlets (626) and the buffer chambers (621) at a predetermined angle, and a plurality of the buffer chambers (621) are in communication with a plurality of the buffer air outlets (626) through the flow guiding walls (628).

10. A circuit breaker, characterized in that it comprises a contact assembly (20), a total air outlet (30) and an arc extinguishing assembly according to any one of claims 1 to 9.