CN116313679A

CN116313679A - Circuit breaker

Info

Publication number: CN116313679A
Application number: CN202310064749.1A
Authority: CN
Inventors: 张森林; 孙良权; 孙健焜; 刘毅; 张慧民
Original assignee: Shanghai Electrical Apparatus Research Institute Group Co Ltd
Current assignee: Shanghai Electrical Apparatus Research Institute Group Co Ltd
Priority date: 2023-01-12
Filing date: 2023-01-12
Publication date: 2023-06-23

Abstract

The application provides a circuit breaker, including arc extinguishing system and contact system and the gas vent of relative setting, arc extinguishing system includes arc extinguishing subassembly and prevents breaking down the subassembly. The arc extinguishing assembly comprises a first arc extinguishing chamber, a second arc extinguishing chamber and an arc guide piece, wherein the projections of the first arc extinguishing chamber and the second arc extinguishing chamber on a first plane along a first direction are at least partially overlapped, the first arc extinguishing chamber and the second arc extinguishing chamber can be electrically connected through the arc guide piece, the second arc extinguishing chamber is located on one side, deviating from the contact system, of the first arc extinguishing chamber, the first direction is parallel to the arrangement direction of the contact system and the exhaust port, and the first plane is perpendicular to the first direction. The breakdown prevention assembly comprises a first insulating piece, the first insulating piece is abutted to one side, deviating from the first arc-extinguishing chamber, of the second arc-extinguishing chamber, the first insulating piece is provided with a plurality of first through parts penetrating through the first insulating piece along a first direction, and the first through parts are used for discharging gas generated by the second arc-extinguishing chamber to an exhaust port. The circuit breaker of this application embodiment can improve the arc extinguishing effect.

Description

Circuit breaker

Technical Field

The present application relates to the field of circuit switching devices, and in particular to a circuit breaker.

Background

A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions and closing, carrying and opening a current under abnormal circuit conditions within a prescribed time. In general, an arc extinguishing chamber is adopted to extinguish an arc, and metal grid plates arranged in a stacking mode are adopted in the arc extinguishing chamber to cut the arc, so that a long arc is forced to be divided into a plurality of sections of short arcs, and arc partial pressure and cooling are realized.

A circuit breaker breaking a high voltage circuit generally comprises two arc extinguishing chambers, a first arc extinguishing chamber, which is close to a contact system, and a second arc extinguishing chamber, which is remote from the contact system. When breaking the circuit, the arc of the second arc-extinguishing chamber may move to one side away from the first arc-extinguishing chamber, so that breakdown occurs, and the arc-extinguishing effect of the circuit breaker is reduced.

Disclosure of Invention

The embodiment of the application provides a circuit breaker to improve the arc extinguishing effect.

The embodiment of the application provides a circuit breaker, including arc extinguishing system and contact system and the gas vent of relative setting, arc extinguishing system includes arc extinguishing subassembly and prevents breaking through the subassembly. The arc extinguishing assembly comprises a first arc extinguishing chamber, a second arc extinguishing chamber and an arc guide piece, wherein the projections of the first arc extinguishing chamber and the second arc extinguishing chamber on a first plane along a first direction are at least partially overlapped, the first arc extinguishing chamber and the second arc extinguishing chamber can be electrically connected through the arc guide piece, the second arc extinguishing chamber is located on one side, deviating from the contact system, of the first arc extinguishing chamber, the first direction is parallel to the arrangement direction of the contact system and the exhaust port, and the first plane is perpendicular to the first direction. The breakdown prevention assembly comprises a first insulating piece, the first insulating piece is abutted to one side, deviating from the first arc-extinguishing chamber, of the second arc-extinguishing chamber, the first insulating piece is provided with a plurality of first through parts penetrating through the first insulating piece along a first direction, and the first through parts are used for discharging gas generated by the second arc-extinguishing chamber to an exhaust port.

In some embodiments, the circuit breaker includes a conductive bar, a wiring board, and a transition plate connected between the conductive bar and the wiring board, the conductive bar is opposite to the arc extinguishing assembly in a second direction, the second direction is parallel to an arrangement direction of a plurality of gate sheets of the second arc extinguishing chamber and intersects the first direction, the first insulating member includes a first body and a baffle, the first body is provided with a plurality of first through portions, at least part of the baffle is disposed on a side of the first body facing away from the second arc extinguishing chamber, the baffle extends from a junction of the transition plate and the conductive bar to a side of the wiring board facing away from the conductive bar, a cavity is formed between the baffle and the plurality of first through portions opposite to the baffle in the first direction, and the cavity is communicated with the exhaust port.

In some embodiments, the first body includes a partition, a first portion and a second portion, the first portion and the partition are arranged along a second direction, the second portion is connected to one side of the partition near the second arc extinguishing chamber, the second portion is opposite to the baffle in the first direction and exceeds an end portion of the baffle, which faces away from the conductive row, along a direction from the conductive row to the second arc extinguishing chamber, at least part of the partition is connected between the baffle and the second portion and divides the cavity into two subcavities opposite along a third direction, the two subcavities are respectively communicated with the exhaust port, and the third direction is intersected with both the first direction and the second direction.

In some embodiments, the end of the baffle facing away from the conductive strip has a first surface opposite the second arc chute, the first surface, the surface of the first subsection facing away from the second arc chute and the surface of the spacer facing away from the second arc chute being in the same plane.

In some embodiments, at least part of the first through portions is located between two adjacent gate sheets of the second arc extinguishing chamber, the first insulating member includes a first body and a plurality of first air guide portions, the first body is provided with a plurality of first through portions, the plurality of first air guide portions are disposed on one side of the first body facing the second arc extinguishing chamber, at least one side of at least part of the first through portions in a third direction is correspondingly provided with the first air guide portions, and gas between two adjacent gate sheets of the second arc extinguishing chamber is introduced into the first insulating member through the first air guide portions, and the third direction intersects in the first direction and an arrangement direction of the plurality of gate sheets of the second arc extinguishing chamber.

In some embodiments, the first air guiding portion has a strip-shaped structure and a first air guiding surface facing away from the first body, and the distance between the first air guiding surface and the first body is gradually reduced from one end far away from the first through portion to one end close to the first through portion.

In some embodiments, the plurality of first through sub-portions includes a plurality of first through sub-portions and a plurality of second through sub-portions, the plurality of first through sub-portions and the plurality of second through sub-portions are disposed at intervals along a second direction in a projection of a second plane, the second direction is parallel to an arrangement direction of the plurality of gate sheets of the second arc extinguishing chamber, the second plane is perpendicular to the second direction, and a projection of the plurality of first through sub-portions along a third direction on a side where the plurality of second through sub-portions are disposed is alternately and alternately disposed with the plurality of second through sub-portions in the second direction; one side of the first through sub-part and one side of the second through sub-part in the third direction are respectively provided with a first air guide part, and the air guide directions of the first air guide parts corresponding to the first through sub-part and the second through sub-part are opposite.

In some embodiments, the breakdown preventing assembly further includes a second insulating member, the second insulating member is abutted to one side of the first arc-extinguishing chamber facing the second arc-extinguishing chamber, the second insulating member includes a second body and a second air guide portion, the second body is provided with a plurality of second through portions, at least part of the second through portions are located between two adjacent grid sheets of the first arc-extinguishing chamber and are used for discharging air generated by the first arc-extinguishing chamber, the plurality of second air guide portions are arranged on one side of the second body facing the first arc-extinguishing chamber, at least part of the second through portions are correspondingly provided with second air guide portions on at least one side of a fourth direction, and air between the two adjacent grid sheets of the first arc-extinguishing chamber is led into the second insulating member through the second air guide portion, and the fourth direction intersects in the first direction and the arrangement direction of the plurality of grid sheets of the first arc-extinguishing chamber.

In some embodiments, the circuit breaker further comprises two opposite side plates, the first arc-extinguishing chamber and the second arc-extinguishing chamber are mounted on the side plates, the second insulating member further comprises an end plate arranged on the second body, the end plate is arranged at one end of the second body in the lamination direction of the plurality of gate sheets of the first arc-extinguishing chamber, and two opposite ends of the end plate along the fourth direction are respectively clamped with the two side plates.

In some embodiments, the first arc extinguishing chamber comprises a first end and a second end opposite to each other in the stacking direction, the second arc extinguishing chamber comprises a third end and a fourth end opposite to each other in the stacking direction, the projection of the first arc extinguishing chamber on the second arc extinguishing chamber in the first direction covers the fourth end, the projection of the second arc extinguishing chamber on the first arc extinguishing chamber in the first direction covers the first end, the second insulating member further comprises a gas guide plate connected to the second body, the gas guide plate comprises a fifth end stacked with the first end and a sixth end stacked with the fourth end, the gas guide plate guides gas of the first arc extinguishing chamber to the gas outlet in the direction from the fifth end to the sixth end, the first insulating member extends from the third end to the fourth end and has a limit protrusion facing the sixth end, and one side of the sixth end facing the fourth end is provided with a limit groove for accommodating the limit protrusion and limiting the limit protrusion in the first direction.

In some embodiments, the arc guiding piece comprises a seventh end stacked with the fourth end, a slot is formed on one side of the sixth end of the gas guiding plate facing the fourth end of the second arc extinguishing chamber, and the seventh end of the arc guiding piece can be in plug-in fit with the slot.

In some embodiments, the circuit breaker further includes two first arc-gathering members symmetrically disposed and two second arc-gathering members symmetrically disposed, at least a portion of the first arc-gathering members being disposed between the first arc-extinguishing chamber and the contact system, the first arc-gathering members including second surfaces facing each other, a first slit being formed between the two second surfaces of the two first arc-gathering members so that the arc moves to the first arc-extinguishing chamber along the first slit, a first limit groove being disposed on a side of the first arc-gathering member opposite to the second surface in a fourth direction, the first limit groove being in one-to-one engagement with at least a portion of the first arc-extinguishing chamber, the fourth direction being perpendicular to the first direction and a stacking direction of the plurality of the first arc-extinguishing chamber; at least part of second arc-suppressing member sets up between first explosion chamber and second explosion chamber, second arc-suppressing member includes the third surface towards each other, form the second narrow slit between two third surfaces of two second arc-suppressing members, so that the electric arc moves to the second explosion chamber along the second narrow slit, the second limiting groove that is equipped with the one-to-one with at least partial bars piece of second explosion chamber in the opposite side of third direction with the third surface of second arc-suppressing member, third direction perpendicular to the range upon range of direction of a plurality of bars pieces of first direction and second explosion chamber.

In some embodiments, the fourth direction is parallel to the third direction, the first arc gathering member includes a first arc gathering portion and a second arc gathering portion, the first arc gathering portion is located between the first arc extinguishing chamber and the contact system, the second arc gathering portion is located at one side of the first arc extinguishing chamber in the stacking direction of the grid sheets, one end of the second arc gathering portion, facing the second arc extinguishing chamber, is provided with a first step surface, one end of the second arc gathering member, facing the contact system, is provided with a second step surface, and the first step surface and the second step surface are in butt fit to form limiting of the first arc gathering member and the second arc gathering member in the third direction.

In some embodiments, the contact system includes the stationary contact, and the stationary contact sets up relatively in first direction with the second explosion chamber, and the arc root of stationary contact can shift to the second explosion chamber, and the stationary contact includes the loading board, keeps off arc spare and stationary contact, and the stationary contact sets up in loading board face one side towards the arc extinguishing subassembly, keeps off the arc spare and applies in loading board face and set up around the stationary contact towards the one side of arc extinguishing subassembly, keeps off the arc spare and is used for preventing the arc root of stationary contact to the direction motion that deviates from the second explosion chamber.

This application sets up first insulating part through one side that deviates from first explosion chamber at the second explosion chamber to block the electric arc, make with first insulating part in the unable motion to the second explosion chamber of electric arc of first direction corresponding part, thereby improve the arc extinguishing effect of second explosion chamber, improve the arc extinguishing effect of circuit breaker promptly.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present application will be described below by referring to the accompanying drawings.

Fig. 1 is a schematic structural view of a circuit breaker according to an embodiment of the present application;

fig. 2 is a schematic partial structure of a circuit breaker according to an embodiment of the present application;

fig. 3 is a schematic structural view of a breakdown preventing assembly of the circuit breaker according to the embodiment of the present application;

fig. 4 is a schematic structural view of a first insulating member of the circuit breaker according to the embodiment of the present application;

fig. 5 is a schematic structural view of a second insulating member of the circuit breaker according to the embodiment of the present application;

fig. 6 is an exploded view of a second insulator and side plate of the circuit breaker of the embodiments of the present application;

FIG. 7 is an assembly view of the second insulator and side plates shown in FIG. 6;

FIG. 8 is a schematic view of the second insulator shown in FIG. 5 at another angle;

FIG. 9 is a schematic view of a partial structure of the second insulator shown in FIG. 8 at another angle;

fig. 10 is a schematic structural view of an arc guide plate of the circuit breaker according to the embodiment of the present application;

FIG. 11 is a schematic view of a partial assembly of the second insulator shown in FIG. 9 and the arc chute shown in FIG. 10;

fig. 12 is a schematic view of an assembled structure of a first arc focusing member and a second arc focusing member of the circuit breaker according to the embodiment of the present application;

FIG. 13 is a schematic view of the first arc gathering member shown in FIG. 12;

FIG. 14 is a schematic view of the structure of the second arc runner shown in FIG. 12;

fig. 15 is an exploded view of a stationary contact and an arc chute of a circuit breaker according to an embodiment of the present application;

FIG. 16 is a schematic view of the assembly of the stationary contact and the arc chute shown in FIG. 15;

fig. 17 is another exploded view of a stationary contact and an arc chute of a circuit breaker of an embodiment of the present application;

FIG. 18 is an assembly view of the stationary contact and the arc chute shown in FIG. 17;

fig. 19 is another structural schematic view of the first insulating member of the circuit breaker according to the embodiment of the present application;

fig. 20 is another structural schematic diagram of a breakdown preventing assembly of the circuit breaker according to the embodiment of the present application;

fig. 21 is another structural schematic diagram of a second insulating member of the circuit breaker according to the embodiment of the present application.

Reference numerals:

1. a contact system;

11. a stationary contact; 12. a carrying plate; 13. an arc blocking piece; 131. a first sub-section; 132. a second sub-section; 14. a stationary contact;

2. an exhaust port;

3. an arc extinguishing system;

4. an arc extinguishing assembly; 41. a first arc extinguishing chamber; 411. a first end; 412. a second end; 42. a second arc extinguishing chamber; 421. a third end; 422. a fourth end; 43. an arc guide member; 431. a seventh end;

5. an anti-puncture assembly;

51. A first insulating member;

511. a first through portion; 5111. a first through sub-section; 5112. a second through sub-section; 512. a first body; 5121. a first reinforcing plate; 513. a baffle; 5131. a first surface; 514. a cavity; 5141. a sub-cavity; 515. an isolation part; 516. a first subsection; 517. a second subsection; 518. a first air guide part; 5181. a first air guide surface; 519. a limit protrusion;

52. a second insulating member;

521. a second body; 5211. a second reinforcing plate; 522. a second air guide part; 523. a second through portion; 524. an end plate; 525. an air guide plate; 526. a fifth end; 527. a sixth end; 528. a limit groove; 529. a slot;

61. a conductive bar; 62. a wiring board; 63. a transition plate; 64. a side plate; 65. an arc guiding sheet; 66. a connecting plate;

71. a first arc gathering member; 711. a second surface; 712. a first slot; 713. a first limit groove; 714. a first arc-gathering portion; 715. a second arc-converging portion; 716. a first step surface; 72. a second arc-gathering member; 721. a third surface; 722. a second slit; 723. the second limit groove; 724. a second step surface;

x, a first direction;

y, second direction;

z, third direction;

A. and a fourth direction.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the present application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.

For a better understanding of the present application, embodiments of the present application are described below in connection with fig. 1 to 21.

Fig. 1 is a schematic structural view of a circuit breaker according to an embodiment of the present application; fig. 2 is a schematic partial structure of a circuit breaker according to an embodiment of the present application.

Referring to fig. 1 and 2, the circuit breaker provided in the embodiment of the present application includes an arc extinguishing system 3, and a contact system 1 and an exhaust port 2 disposed opposite to each other, where the arc extinguishing system 3 includes an arc extinguishing assembly 4 and a breakdown preventing assembly 5. The arc extinguishing assembly 4 comprises a first arc extinguishing chamber 41, a second arc extinguishing chamber 42 and an arc guiding member 43, wherein the projections of the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42 on a first plane along a first direction X are at least partially overlapped, and can be electrically connected through the arc guiding member 43, the second arc extinguishing chamber 42 is positioned on one side of the first arc extinguishing chamber 41 away from the contact system 1, wherein the first direction X is parallel to the arrangement direction of the contact system 1 and the exhaust port 2, and the first plane is perpendicular to the first direction X.

The breakdown preventing assembly 5 includes a first insulating member 51, where the first insulating member 51 abuts against one side of the second arc extinguishing chamber 42 facing away from the first arc extinguishing chamber 41, and the first insulating member 51 is provided with a plurality of first through portions 511 penetrating through itself along the first direction X, and the first through portions 511 are configured to discharge gas generated by the second arc extinguishing chamber 42 toward the exhaust port 2.

In this embodiment, the projections of the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42 along the first direction X on the first plane may completely overlap, or may partially overlap. Alternatively, the projection portions of the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42 on the first plane along the first direction X overlap.

The first insulating member 51 of the embodiment of the present application abuts against one side of the second arc extinguishing chamber 42 near the exhaust port 2. The first insulating member 51 may abut against the entire side of the second arc extinguishing chamber 42 facing the exhaust port 2, or may abut against a portion of the side of the second arc extinguishing chamber 42 facing the exhaust port 2.

The embodiment of the present application does not limit the specific structure of the first through portion 511. Illustratively, the first through portion 511 is a through hole or a slot.

The first insulating member 51 of the embodiment of the present application is made of an insulating material.

When the second arc-extinguishing chamber 42 is in arc extinction, the arc may move to one side of the second arc-extinguishing chamber 42 away from the first arc-extinguishing chamber 41, so that a breakdown phenomenon occurs, at least part of the grid plates of the second arc-extinguishing chamber 42 cannot play an arc-extinguishing role, and an arc-extinguishing effect is affected. This application is through setting up first insulating part 51 in one side that second explosion chamber 42 deviates from first explosion chamber 41 to block the electric arc, make with first insulating part 51 at the unable motion to the second explosion chamber 42 of electric arc of first direction X corresponding part outside, thereby improve the arc extinguishing effect of second explosion chamber 42, improve the arc extinguishing effect of circuit breaker promptly.

In some embodiments, the first insulating member 51 extends from one end of the second arc extinguishing chamber 42 in the lamination direction to the other end in the lamination direction.

Optionally, the dimension of the first insulating member 51 along the third direction Z is greater than or equal to the dimension of the corresponding portion of the second arc extinguishing chamber 42 along the third direction Z. Wherein the third direction Z intersects the first direction X and the arrangement direction of the gate sheets of the second arc extinguishing chamber 42.

Optionally, a first through portion 511 is correspondingly disposed between any two gate sheets of the second arc extinguishing chamber 42.

In some embodiments, the circuit breaker includes a conductive bar 61, a terminal plate 62, and a transition plate 63 connected between the conductive bar 61 and the terminal plate 62, the conductive bar 61 is opposite to the arc extinguishing assembly 4 in a second direction Y, the second direction Y is parallel to an arrangement direction of the plurality of gate sheets of the second arc extinguishing chamber 42 and intersects the first direction X, the first insulating member 51 includes a first body 512 and a baffle 513, the first body 512 is provided with a plurality of first through portions 511, at least part of the baffle 513 is disposed on a side of the first body 512 facing away from the second arc extinguishing chamber 42, the baffle 513 extends from a connection of the transition plate 63 and the conductive bar 61 to a side of the terminal plate 62 facing away from the conductive bar 61, a plurality of first through portions 511 opposite to the baffle 513 in the first direction X form a cavity 514 between the baffle 513, and the cavity 514 communicates with the exhaust port 2.

The embodiment of the application does not limit the included angle between the transition plate 63 and the conductive bars 61, the wiring board 62. Illustratively, the transition plate 63 is connected to the conductor bars 61 and the terminal plate 62 at an obtuse angle.

The baffle 513 in the embodiment of the present application extends from the connection between the transition plate 63 and the conductive bar 61 to the connection between the transition plate 63 and the wiring board 62, which means that the baffle 513 has two opposite ends, one of which is located at the connection between the transition plate 63 and the conductive bar 61 and the other of which is located at the side of the wiring board 62 facing away from the conductive bar 61. The side of the terminal plate 62 facing away from the conductor bars 61 is the upper side of the terminal plate 62 in fig. 2.

The high temperature gas generated from the arc after being cut by the second arc chute 42 is directly discharged to the transition plate 63 and the terminal plate 62, thereby causing the terminal plate 62 to be welded with the bolts provided thereon, causing damage to the terminal plate 62, thereby affecting the use. The application sets up baffle 513 in one side that first body 512 deviates from second explosion chamber 42, and baffle 513 extends to the one side that wiring board 62 deviates from electrically conductive row 61 from the junction of transition board 63 and electrically conductive row 61, and in this way, baffle 513 has blockked the effect to the high temperature gas, blocks the direct row of at least part high temperature gas to transition board 63 and wiring board 62, improves the fusion welding problem of wiring board 62 and bolt, prolongs the life of wiring board 62.

Fig. 3 is a schematic structural view of a breakdown preventing assembly of the circuit breaker according to the embodiment of the present application.

Referring to fig. 3, in some embodiments, the first body 512 includes a partition 515, a first portion 516 and a second portion 517, the first portion 516 and the partition 515 are arranged along a second direction Y, the second portion 517 is connected to a side of the partition 515 near the second arc extinguishing chamber 42, the second portion 517 is opposite to the baffle 513 in a first direction X and extends beyond an end of the baffle 513 facing away from the conductive line 61 in a direction from the conductive line 61 to the second arc extinguishing chamber 42, at least a portion of the partition 515 is connected between the baffle 513 and the second portion 517 and divides the cavity 514 into two sub-cavities 5141 opposite in a third direction Z, the two sub-cavities 5141 are respectively communicated with the exhaust port 2, and the third direction Z intersects both the first direction X and the second direction Y.

The second section 517 and the baffle 513 of the present embodiment form the cavity therebetween.

Optionally, the third direction Z is perpendicular to the first direction X and the second direction Y.

The shape of the isolation portion 515 is not limited in the embodiment of the present application. Illustratively, the spacer 515 is a plate-like member. Further alternatively, the partition 515 is disposed perpendicular to the third direction Z.

Optionally, the isolation portion 515 extends from an end of the second portion 517 facing away from the first portion 516 to an end of the second portion 517 adjacent to the first portion 516 to divide an area of the second portion 517 opposite the portion of the second portion beyond the baffle 513 into two portions that are respectively in communication with the two subcavities 5141.

Optionally, the first section 516, the second section 517 and the spacer section 515 are all directly connected. Further, the isolation portion 515, the first division 516, the second division 517, and the baffle 513 are integrally formed.

In this embodiment, the second subsection 517 extends beyond the end portion of the baffle 513 away from the conductive strip 61 along the direction from the conductive strip 61 to the second arc extinguishing chamber 42, so that the area corresponding to the portion of the second subsection 517 extending beyond the baffle 513 along the first direction X can be communicated with the two sub-cavities 5141, and the two sub-cavities 5141 are communicated with the exhaust port 2 through the partial area, so that the high-temperature gas is smoothly discharged.

The isolation portion 515 is disposed so as to be connected between the baffle 513 and the second division portion 517 and divides the cavity 514 into two sub-cavities 5141, so that not only the structural strength of the first insulating member 51 is increased, but also the high temperature gas is separated, and the possibility of re-arcing of the high temperature gas is reduced.

In some embodiments, the end of the baffle 513 facing away from the conductive row 61 has a first surface 5131 opposite the second arc chute 42, the first surface 5131, the surface of the first subsection 516 facing away from the second arc chute 42 and the surface of the partition 515 facing away from the second arc chute 42 being in the same plane.

By this arrangement, the side of the first insulating member 51 facing the exhaust port 2 can be made planar, so that other structures can be easily provided, and interference between the first insulating member 51 and other components can be reduced.

Fig. 4 is a schematic structural view of a first insulating member of the circuit breaker according to the embodiment of the present application.

Referring to fig. 4, in some embodiments, at least a portion of the first through portion 511 is located between two adjacent gate sheets of the second arc extinguishing chamber 42, the first insulating member 51 includes a first body 512 and a plurality of first air guiding portions 518, the first body 512 is provided with a plurality of first through portions 511, the plurality of first air guiding portions 518 are disposed on a side of the first body 512 facing the second arc extinguishing chamber 42, at least one side of at least a portion of the first through portions 511 in a third direction Z is correspondingly provided with the first air guiding portions 518, and gas between two adjacent gate sheets of the second arc extinguishing chamber 42 is introduced into itself through the first air guiding portions 518, and the third direction Z intersects the first direction X and the arrangement direction of the plurality of gate sheets of the second arc extinguishing chamber 42.

At least a portion of the first through portion 511 is located between two adjacent gate sheets of the second arc extinguishing chamber 42, and does not represent that at least a portion of the first through portion 511 is provided between any two adjacent gate sheets of the second arc extinguishing chamber 42.

The shape of the first air guide 518 is not limited in the embodiment of the present application. The first air guiding portion 518 may be an integral strip structure, or may be a plurality of block structures disposed at intervals.

The first air guide portion 518 of the present embodiment may be disposed on one side of the first through portion 511 in the third direction Z, or may be disposed on opposite sides of the first through portion 511 in the third direction Z.

Optionally, the third direction Z is perpendicular to the arrangement direction of the plurality of gate sheets of the second arc extinguishing chamber 42. Further alternatively, the first direction X, the arrangement direction of the plurality of gate sheets of the second arc extinguishing chamber 42, and the third direction Z are perpendicular to each other.

The first air guide portion 518 is disposed on the first body 512, so that high-temperature air generated by arc extinction between two adjacent grid plates is guided into the first through portion 511, so that the high-temperature air smoothly moves towards the air outlet 2, the air outlet efficiency is improved, and explosion risks caused by unsmooth flow of the high-temperature air are reduced.

In some embodiments, the first air guiding portion 518 has a strip-shaped structure and has a first air guiding surface 5181 facing away from the first body 512, and the distance between the first air guiding surface 5181 and the first body 512 is gradually reduced from one end of the first air guiding portion 518 away from the first through portion 511 to one end of the first air guiding portion near the first through portion 511.

The shape of the first air guide surface 5181 is not limited in the embodiment of the present application. The first air guiding surface 5181 may be a plane surface, a curved surface, or an irregularly shaped surface combining a plane surface and a curved surface.

The first air guiding part 518 is arranged in a whole strip-shaped structure, so that the processing and the manufacturing are convenient.

In some embodiments, the plurality of first through portions 511 includes a plurality of first through sub-portions 5111 and a plurality of second through sub-portions 5112, the plurality of first through sub-portions 5111 and the plurality of second through sub-portions 5112 are disposed at intervals along a second direction Y in a projection of a second plane, the second direction Y is parallel to an arrangement direction of the plurality of gate sheets of the second arc extinguishing chamber 42, the second plane is perpendicular to the second direction Y, and projections of the plurality of first through sub-portions 5111 along a third direction Z on sides of the plurality of second through sub-portions 5112 are alternately and alternately disposed with the plurality of second through sub-portions 5112 along the second direction Y.

Optionally, the third direction Z, the first direction X and the second direction Y are perpendicular to each other.

The first through sub-portions 5111 and the second through sub-portions 5112 are arranged at the projection interval of the second plane along the second direction Y, and the projections of the plurality of first through sub-portions 5111 on the side of the plurality of second through sub-portions 5112 along the third direction Z are alternately arranged at intervals along the second direction Y with the plurality of second through sub-portions 5112, so that the adjacent two first through sub-portions 5111 are larger in interval, the adjacent two second through sub-portions 5112 are also larger in interval, the structural strength of the first insulating member 51 can be remarkably increased, the possibility that high-temperature gas is re-burnt on the side of the first insulating member 51 deviating from the second arc extinguishing chamber 42 is greatly reduced, and the arc extinguishing effect of the second arc extinguishing chamber 42 is improved.

In some embodiments, one first air guiding portion 518 is disposed on each side of the first through sub-portion 5111 and the second through sub-portion 5112 in the third direction Z, and the air guiding directions of the first air guiding portions 518 corresponding to the first through sub-portion 5111 and the second through sub-portion 5112 are opposite.

In the present embodiment, the first through sub-portion 5111 is provided with a first air guide portion 518 on a side close to the second through sub-portion 5112, and the second through sub-portion 5112 is provided with a first air guide portion 518 on a side close to the first through sub-portion 5111.

The air guiding directions of the first air guiding portion 518 and the second air guiding portion 522 in this embodiment are along the third direction Z.

By providing the first gas guide portions 518 corresponding to the first through sub-portions 5111 and the second through sub-portions 5112 in the opposite gas guide directions, the high-temperature gas generated by arc extinction between the adjacent first through sub-portions 5111 or the adjacent second through sub-portions 5112 can be guided to the corresponding first through portions 511 along the first gas guide portions 518, and the accumulation of the high-temperature gas can be reduced.

Fig. 5 is a schematic structural view of a second insulating member of the circuit breaker according to the embodiment of the present application.

Referring to fig. 5, in some embodiments, the breakdown preventing assembly 5 further includes a second insulating member 52, the second insulating member 52 is abutted against one side of the first arc extinguishing chamber 41 facing the second arc extinguishing chamber 42, the second insulating member 52 includes a second body 521 and a second air guiding portion 522, the second body 521 is provided with a plurality of second through portions 523, at least part of the second through portions 523 are located between two adjacent grid sheets of the first arc extinguishing chamber 41 and are used for discharging the air generated by the first arc extinguishing chamber 41, the plurality of second air guiding portions 522 are disposed on one side of the second body 521 facing the first arc extinguishing chamber 41, at least part of the second through portions 523 are correspondingly provided with second air guiding portions 522 on at least one side of the fourth direction a, and the second direction a intersects the first direction X and the arrangement direction of the plurality of grid sheets of the first arc extinguishing chamber 41.

The second insulating member 52 may be abutted against the entire side of the first arc extinguishing chamber 41 facing the second arc extinguishing chamber 42, or may be abutted against a portion of the side of the first arc extinguishing chamber 41 facing the second arc extinguishing chamber 42.

The second insulating member 52 of the present embodiment is made of an insulating material.

At least a portion of the second through portion 523 is located between two adjacent gate sheets of the first arc extinguishing chamber 41, and does not represent that at least a portion of the second through portion 523 is provided between any two adjacent gate sheets of the first arc extinguishing chamber 41.

The embodiment of the present application does not limit the specific structure of the second through portion 523. The second through portion 523 is a through hole or a groove, for example.

The shape of the second air guide 522 is not limited in the embodiment of the present application. The second air guiding portion 522 may be an integral strip structure, or may be a plurality of block structures disposed at intervals.

The second air guiding portion 522 in the embodiment of the present application may be disposed at one side of the second through portion 523 in the fourth direction a, or may be disposed at two opposite sides of the second through portion 523 in the fourth direction a.

Alternatively, the fourth direction a is perpendicular to the arrangement direction of the plurality of gate sheets of the first arc extinguishing chamber 41. Further alternatively, the first direction X, the arrangement direction of the plurality of gate sheets of the first arc extinguishing chamber 41, and the fourth direction a are perpendicular to each other.

Optionally, the fourth direction a is parallel to the third direction Z.

The second air guide part 522 is arranged on the second body 521, so that high-temperature air generated by arc extinction between two adjacent grid plates in the first arc extinguishing chamber 41 is guided into the second through part 523, thereby enabling the high-temperature air to smoothly move towards the air outlet 2, improving the air outlet efficiency and reducing explosion risks caused by unsmooth flow of the high-temperature air.

Fig. 6 is an exploded view of a second insulator and a side plate of the circuit breaker according to the embodiment of the present application, and fig. 7 is an assembly view of the second insulator and the side plate shown in fig. 6.

Referring to fig. 6 and 7, in some embodiments, the circuit breaker further includes two opposite side plates 64, the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42 are mounted on the side plates 64, the second insulating member 52 further includes an end plate 524 disposed on the second body 521, the end plate 524 is disposed on one end of the second body 521 in the stacking direction of the plurality of gate sheets of the first arc extinguishing chamber 41, and two opposite ends of the end plate 524 along the fourth direction a are respectively clamped with the two side plates 64.

The end plate 524 of the embodiment of the present application is disposed at an end of the second body 521 remote from the stationary contact of the contact system 1, i.e., at an upper end in fig. 2.

The embodiment of the present application does not limit the way in which the end plate 524 is clamped to the side plate 64. Illustratively, the two sides of the end plate 524 are provided with protrusions, the side plate 64 is provided with a recess, and the protrusions can be clamped in the recess to limit the spacing of the end plate 524 and the side plate 64 in the first direction X. Optionally, the protrusions are provided with a guide ramp for abutment with the side plates 64 to enable movement of the end plates 524 to the recess. Still another example, two sides of the end plate 524 are provided with protrusions, the side plate 64 is provided with a through hole, and the protrusions can be clamped in the through hole to limit the limit of the end plate 524 and the side plate 64 in the first direction X. Still another example, two sides of the end plate 524 are provided with grooves, the side plate 64 is provided with protrusions, and the protrusions can be clamped in the grooves to limit the limit of the end plate 524 and the side plate 64 in the first direction X.

The end plate 524 is clamped with the side plate 64, that is, the second insulating member 52 is clamped with the side plate 64, so that the second insulating member 52 is mounted and fixed, and the structural strength of the circuit breaker is improved.

Fig. 8 is a schematic view of the second insulator shown in fig. 5 at another angle.

Referring to fig. 1, 3, 5 and 8, in some embodiments, the first arc extinguishing chamber 41 includes a first end 411 and a second end 412 opposite in the stacking direction, the second arc extinguishing chamber 42 includes a third end 421 and a fourth end 422 opposite in the stacking direction, a projection of the first arc extinguishing chamber 41 in the first direction X on the second arc extinguishing chamber 42 covers the fourth end 422, and a projection of the second arc extinguishing chamber 42 in the first direction X on the first arc extinguishing chamber 41 covers the first end 411.

The second insulating member 52 further includes a gas guide plate 525, the gas guide plate 525 is connected to the second body 521, the gas guide plate 525 includes a fifth end 526 stacked with the first end 411 and a sixth end 527 stacked with the fourth end 422, and the gas guide plate 525 guides the gas of the first arc extinguishing chamber 41 to be discharged to the gas outlet 2 along the direction from the fifth end 526 to the sixth end 527. The first insulating member 51 extends from the third end 421 to the fourth end 422 and has a limiting projection 519 facing the sixth end 527, and a limiting groove 528 is formed on a side of the sixth end 527 facing the fourth end 422, and the limiting groove 528 is configured to receive the limiting projection 519 and limit the limiting projection 519 in the first direction X.

The gas guide plate 525 of the present embodiment is formed substantially in a Z-shaped structure, and a middle portion of the Z-shaped structure is used to guide the gas of the first arc extinguishing chamber 41 to the gas exhaust port 2.

In the actual use process of the circuit breaker, the first insulating member 51 is located above the second insulating member 52, so as to reduce the risk of the second insulating member 52 falling due to gravity, and therefore, the first insulating member 51 and the second insulating member 52 are limited in the first direction X through the limiting protrusion 519 and the limiting groove 528, thereby increasing the durability of the circuit breaker in use.

In other embodiments, the first insulating member 51 extends from the third end 421 to the fourth end 422 and has a limiting protrusion 519 facing the sixth end 527, and a limiting protrusion is formed on a side of the sixth end 527 facing the fourth end 422, and the limiting protrusion is configured to abut against a side of the limiting protrusion 519 facing the second arc extinguishing chamber 42 and support the limiting protrusion 519 in the first direction X.

The present embodiment does not limit the shape of the limit protrusion, and it may be, for example, a block shape or a bar shape.

Fig. 9 is a schematic view of a partial structure of the second insulating member shown in fig. 8 at another angle, fig. 10 is a schematic view of a structure of an arc guide of the circuit breaker according to an embodiment of the present application, and fig. 11 is a schematic view of a partial assembly structure of the second insulating member shown in fig. 9 and the arc guide shown in fig. 10.

Referring to fig. 9-11, in some embodiments, the arc guiding member 43 includes a seventh end 431 stacked on the fourth end 422, and a slot 529 is formed on a side of the sixth end 527 of the air guiding plate 525 facing the fourth end 422, where the seventh end 431 of the arc guiding member 43 can be in plug-in fit with the slot 529.

Optionally, the arc guide 43 includes an end portion stacked with the first end 411 of the first arc extinguishing chamber 41 and a seventh end 431 stacked with the fourth end 422, so as to electrically connect the first arc extinguishing chamber and the second arc extinguishing chamber.

Alternatively, the arc guide 43 is attached to the air guide plate 525.

The arc guide 43 of the present embodiment is made of a conductive material.

The slot 529 of the present embodiment opens toward the first arc chute 41.

The temperature of the arc guide 43 will gradually rise during the arc extinguishing process, and thermal deformation occurs, and this deformation may be represented by the upward bending of the arc guide 43 or the downward bending of the arc guide 43, so that the air guide plate 525 is in plug-in fit with the end of the arc guide 43, so as to reduce the severity of the bending deformation of the arc guide 43.

Fig. 12 is a schematic view of an assembled structure of a first arc focusing member and a second arc focusing member of the circuit breaker according to the embodiment of the present application; FIG. 13 is a schematic view of the first arc gathering member shown in FIG. 12; fig. 14 is a schematic view of the structure of the second arc accumulating member shown in fig. 12.

Referring to fig. 12-14, in some embodiments, the circuit breaker further includes two first arc-gathering members 71 disposed symmetrically and two second arc-gathering members 72 disposed symmetrically, at least a portion of the first arc-gathering members 71 are disposed between the first arc-extinguishing chamber 41 and the contact system 1, the first arc-gathering members 71 include second surfaces 711 facing each other, and a first slit 712 is formed between the two second surfaces 711 of the two first arc-gathering members 71, so that the arc moves to the first arc-extinguishing chamber 41 along the first slit 712, and a first limiting groove 713 that is inserted into at least a portion of the grid pieces of the first arc-extinguishing chamber 41 one by one is formed on a side of the first arc-gathering members 71 opposite to the second surface 711 in a fourth direction a, and the fourth direction a is perpendicular to the first direction X and the stacking direction of the plurality of grid pieces of the first arc-extinguishing chamber 41.

At least a portion of the second arc-extinguishing member 72 is disposed between the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42, the second arc-extinguishing member 72 includes a third surface 721 facing each other, a second slit 722 is formed between the two third surfaces 721 of the two second arc-extinguishing members 72, so that the arc moves to the second arc-extinguishing chamber 42 along the second slit 722, and a second limiting groove 723 which is inserted one by one with at least a portion of the grid plates of the second arc-extinguishing chamber 42 is provided on a side of the second arc-extinguishing member 72 opposite to the third surface 721 in a third direction Z, and the third direction Z is perpendicular to the first direction X and the lamination direction of the plurality of grid plates of the second arc-extinguishing chamber 42.

The first arc focusing member 71 and the second arc focusing member 72 of the embodiment of the present application are made of an insulating material.

The third direction Z and the fourth direction a in the embodiment of the present application may be parallel to each other or may not be parallel to each other.

The shape of the second surface 711 is not limited in the embodiments of the present application. By way of example, the second surface 711 may be a planar, curved, or other irregularly shaped surface. As is the third surface 721, the disclosure of which is omitted herein.

Optionally, the second arc runner 72 has a dimension along the second direction Y that is the same as the dimension of the second arc chute 42 along the second direction Y.

The first arc-gathering member 71 and the second arc-gathering member 72 are provided, so that the arc can enter the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 along the first slit 712 and the second slit 722 as much as possible by the arc-gathering action of the first arc-gathering member 71 and the second arc-gathering member 72, thereby improving the arc-extinguishing capability of the arc-extinguishing system 3. And, the first arc focusing member 71 and the second arc focusing member 72 are respectively provided with a plurality of first limiting grooves 713 and a plurality of second limiting grooves 723, the plurality of first limiting grooves 713 can form limiting of the grid sheet of the first arc extinguishing chamber 41 in the self-lamination direction and the fourth direction a, the plurality of second limiting grooves 723 can form limiting of the grid sheet of the second arc extinguishing chamber 42 in the self-lamination direction and the third direction Z, the shaking amplitude of the first arc extinguishing chamber 41 and the second arc extinguishing chamber 42 is reduced, and the electric arc can enter the main body part with larger area of the grid sheet and is cut by the main body part of the grid sheet, so that the arc extinguishing effect is improved.

In some embodiments, the fourth direction a is parallel to the third direction Z, the first arc focusing element 71 includes a first arc focusing portion 714 and a second arc focusing portion 715, the first arc focusing portion 714 is located between the first arc extinguishing chamber 41 and the contact system 1, the second arc focusing portion 715 is located at one side of the first arc extinguishing chamber 41 in the stacking direction of the grid sheets, an end of the second arc focusing portion 715 facing the second arc extinguishing chamber 42 has a first step surface 716, an end of the second arc focusing element 72 facing the contact system 1 has a second step surface 724, and the first step surface 716 and the second step surface 724 are in abutting fit to form a limit of the first arc focusing element 71 and the second arc focusing element 72 in the third direction Z.

Optionally, the first arc focusing portion 714 and the second arc focusing portion 715 are integrally provided.

The first step surface 716 and the second step surface 724 of the embodiment of the present application are in abutting engagement, i.e., the first step surface 716 and the second step surface 724 are in matching engagement.

Alternatively, the lamination direction of the gate sheets of the first arc extinguishing chamber 41 is parallel to the lamination direction of the gate sheets of the second arc extinguishing chamber 42. Further alternatively, the length direction of the first step surface 716 and the second step surface 724 is parallel to the lamination direction of the gate sheets of the first arc extinguishing chamber 41.

The first arc-gathering member 71 and the second arc-gathering member 72 are limited in the third direction Z by the first step surface 716 and the second step surface 724, and since the first arc-gathering member 71 and the second arc-gathering member 72 have the limiting action on the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42, respectively, the first arc-gathering member 71 and the second arc-gathering member 72 which are limited to each other can limit the shake of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42, and improve the reliability of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42.

Fig. 15 is an exploded view of the stationary contact and the arc chute of the circuit breaker according to the embodiment of the present application, and fig. 16 is an assembled schematic view of the stationary contact and the arc chute shown in fig. 15, fig. 17 is another exploded view of the stationary contact and the arc chute of the circuit breaker according to the embodiment of the present application, and fig. 18 is an assembled view of the stationary contact and the arc chute shown in fig. 17.

Referring to fig. 15 and 16, in some embodiments, the contact system 1 includes a fixed contact 11, where the fixed contact 11 and the second arc extinguishing chamber 42 are disposed opposite to each other in a first direction X, an arc root of the fixed contact 11 can be transferred to the second arc extinguishing chamber 42, the fixed contact 11 includes a bearing plate 12, an arc blocking member 13, and a fixed contact 14, the fixed contact 14 is disposed on a side of the bearing plate 12 facing the arc extinguishing assembly 4, the arc blocking member 13 is applied on a side of the bearing plate 12 facing the arc extinguishing assembly 4 and disposed around the fixed contact 14, and the arc blocking member 13 is used for preventing the arc root of the fixed contact 11 from moving in a direction away from the second arc extinguishing chamber 42.

The carrier plate 12 of the embodiment of the present application is connected to the conductive bars 61. Alternatively, the carrier plate 12 is integrally provided with the conductive bars 61.

The arc blocking member 13 of the embodiment of the present application is made of an insulating material. Alternatively, the arc blocking member 13 is made of insulating paper or plastic sheet.

The stationary contact 14 of the embodiment of the present application protrudes from the carrier plate 12. Alternatively, the stationary contact 14 is of a block-like structure. Further alternatively, the stationary contact 14 is of a rectangular parallelepiped block-like structure.

The arc blocking member 13 of the present embodiment is disposed around the stationary contact 14, but is not disposed on a side of the stationary contact 14 facing the second arc extinguishing chamber 42.

Optionally, the circuit breaker further includes a connection plate 66 connected between the conductive strip 61 and the carrier plate 12, and two ends of the connection plate 66 are respectively connected with the conductive strip 61 and the carrier plate 12 at an included angle. Further alternatively, the conductive bars 61, the connection plates 66 and the carrier plate 12 are integrally provided.

Optionally, the arc blocking member 13 includes a first sub-portion 131 applied to the carrier plate 12 and a second sub-portion 132 applied to the connecting plate 66, and the second sub-portion 132 is screwed with the connecting plate 66. Further alternatively, the first sub-portion 131 is bonded to the carrier plate 12. Further alternatively, the second sub-portion 132 is bonded to the connection plate 66.

Optionally, the circuit breaker further includes an arc guiding piece 65, where the arc guiding piece 65 is disposed on a side of the conductive bar 61 facing the arc extinguishing assembly 4 and electrically connected to the fixed contact 11, and the arc guiding piece 65 is stacked on the third end 421 of the second arc extinguishing chamber 42 to transfer the arc on the fixed contact 11 to the second arc extinguishing chamber 42.

Further alternatively, the arc guide 65, the connection plate 66 and the arc stopper 13 are screw-coupled.

Referring to fig. 17 and 18, alternatively, the arc blocking member 13 includes a first sub-portion 131 and a second sub-portion 132 attached to the carrier 12, and two third sub-portions 133 and a fourth sub-portion, where the first sub-portion 131 and the fourth sub-portion are disposed opposite to each other along the second direction Y, the second sub-portion 132 is connected to the first sub-portion 131 in a bending manner, and the two third sub-portions 133 are respectively connected to two ends of the first sub-portion 131 along the third direction Z and disposed opposite to each other. The first sub-portion 131, the second sub-portion 132, the two third sub-portions 133 and the fourth sub-portion enclose a receiving cavity, so as to cover and fasten the carrier plate 12, the connecting plate 66 and a portion of the conductive bars 61.

During connection, the arc guide plate 65 and the connecting plate 66 can be assembled together by using screws, and then the arc blocking piece 13 is sleeved. The arc blocking piece 13 is arranged to be of a cover-shaped structure, so that the screw is not exposed, the electric creepage distance is increased, and the use safety of the circuit breaker is improved.

The arc blocking piece 13 is arranged on the bearing plate 12 to prevent the arc root of the fixed contact 11 from moving in the direction deviating from the second arc extinguishing chamber 42, reduce the risk of burning of the arc root near the fixed contact 11 and enhance the arc extinguishing effect of the circuit breaker.

Fig. 19 is another structural schematic view of the first insulating member of the circuit breaker according to the embodiment of the present application; fig. 20 is another structural schematic diagram of a breakdown preventing assembly of a circuit breaker according to an embodiment of the present application.

Referring to fig. 19 and 20, in some embodiments, the first body 512 includes a plurality of first reinforcing plates 5121 sequentially arranged along the third direction Z, two adjacent first reinforcing plates 5121 are disposed opposite to each other along the third direction Z, and at least a portion of the first through portion 511 is disposed between the two adjacent first reinforcing plates 5121.

Further alternatively, the number of the first reinforcing plates 5121 is three, the three first reinforcing plates 5121 form two accommodating spaces, the plurality of first through sub-portions 5111 are disposed in one of the accommodating spaces, and the second through sub-portions 5112 are disposed in the other accommodating space.

The plurality of first reinforcing plates 5121 are provided on the first body 512 to increase the structural strength of the first body 512, reducing the possibility of breakage of the first body 512 due to the provision of the plurality of first through portions 511.

Referring to fig. 21, in some embodiments, the second body 521 includes a plurality of second reinforcing plates 5211 sequentially arranged along the fourth direction a, two adjacent second reinforcing plates 5211 are disposed opposite to each other along the fourth direction a, and at least a portion of the plurality of second through portions 523 is disposed between the two adjacent second reinforcing plates 5211.

A plurality of second reinforcing plates 5211 are provided on the second body 521 to increase the structural strength of the second body 521, reducing the possibility of breakage of the second body 521 due to the provision of the plurality of second through portions 523.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, the technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A circuit breaker comprising a contact system and an exhaust port disposed in opposition, further comprising an arc extinguishing system comprising:

the arc extinguishing assembly comprises a first arc extinguishing chamber, a second arc extinguishing chamber and an arc guide piece, wherein the projections of the first arc extinguishing chamber and the second arc extinguishing chamber on a first plane along a first direction are at least partially overlapped, the first arc extinguishing chamber and the second arc extinguishing chamber can be electrically connected through the arc guide piece, the second arc extinguishing chamber is positioned on one side of the first arc extinguishing chamber, which is away from the contact system, wherein the first direction is parallel to the arrangement direction of the contact system and the exhaust port, and the first plane is perpendicular to the first direction;

the anti-breakdown assembly comprises a first insulating piece, wherein the first insulating piece is abutted to one side, deviating from the first arc-extinguishing chamber, of the second arc-extinguishing chamber, a plurality of first through parts penetrating through the first insulating piece along the first direction are arranged on the first insulating piece, and the first through parts are used for discharging gas generated by the second arc-extinguishing chamber to the exhaust port.

2. The circuit breaker of claim 1, comprising a conductive strip, a terminal block, and a transition plate connected between the conductive strip and the terminal block, the conductive strip being opposite the arc chute assembly in a second direction parallel to the direction of arrangement of the plurality of gate sheets of the second arc chute and intersecting the first direction,

The first insulating piece comprises a first body and a baffle, the first body is provided with a plurality of first through parts, at least part of the baffle is arranged on one side of the first body, which is away from the second arc extinguishing chamber, the baffle extends from the junction of the transition plate and the conducting bar to one side of the wiring board, which is away from the conducting bar, and a cavity is formed between the plurality of first through parts, which are opposite to the baffle in the first direction, and the cavity is communicated with the exhaust port.

3. The circuit breaker according to claim 2, wherein the first body includes a partition, a first division and a second division, the first division and the partition being arranged along the second direction, the second division being connected to a side of the partition near the second arc extinguishing chamber,

the second subsection is opposite to the baffle in the first direction and exceeds the end part of the baffle, which is far away from the conducting bar, along the direction from the conducting bar to the second arc extinguishing chamber, at least part of the isolation part is connected between the baffle and the second subsection and divides the cavity into two subcavities opposite along the third direction, the two subcavities are respectively communicated with the exhaust port, and the third direction is intersected with the first direction and the second direction.

4. The circuit breaker of claim 2, wherein an end of the baffle facing away from the conductive strip has a first surface facing away from the second arc chute, the first surface, the first section facing away from the second arc chute, and the spacer facing away from the second arc chute lie in a same plane.

5. The circuit breaker according to claim 1, wherein,

at least part of the first through part is positioned between two adjacent grid sheets of the second arc extinguishing chamber,

the first insulating piece comprises a first body and a plurality of first air guide parts, wherein the first body is provided with a plurality of first through parts, the first air guide parts are arranged on one side of the first body facing the second arc-extinguishing chamber, at least one side of the first through parts in a third direction is correspondingly provided with the first air guide parts, air between two adjacent grid sheets of the second arc-extinguishing chamber is introduced into the first insulating piece through the first air guide parts, and the third direction is intersected in the first direction and the arrangement direction of the grid sheets of the second arc-extinguishing chamber.

6. The circuit breaker of claim 5, wherein the first air guide portion has a strip-shaped structure and a first air guide surface facing away from the first body, and the first air guide portion is gradually reduced in distance from the first body from one end far away from the first through portion to one end close to the first through portion.

7. The circuit breaker of claim 5, wherein the plurality of first through-portions includes a plurality of first through-sub-portions and a plurality of second through-sub-portions, the plurality of first through-sub-portions and the plurality of second through-sub-portions being disposed at intervals along a projection of a second direction on a second plane, the second direction being parallel to an arrangement direction of the plurality of gate pieces of the second arc extinguishing chamber, the second plane being perpendicular to the second direction,

the projections of the first through sub-parts on the side where the second through sub-parts are located along the third direction are alternately arranged with the second through sub-parts at intervals along the second direction;

one side of the first through sub-part and one side of the second through sub-part in the third direction are respectively provided with one first air guide part, and the air guide directions of the first air guide parts corresponding to the first through sub-part and the second through sub-part are opposite.

8. The circuit breaker of claim 1, wherein the breakdown preventing assembly further comprises a second insulator,

the second insulating piece is abutted to one side of the first arc-extinguishing chamber facing the second arc-extinguishing chamber, the second insulating piece comprises a second body and a second air guide part, the second body is provided with a plurality of second through parts, at least part of the second through parts are positioned between two adjacent grid sheets of the first arc-extinguishing chamber and used for exhausting the air generated by the first arc-extinguishing chamber,

The second gas guide parts are arranged on one side of the second body facing the first arc-extinguishing chamber, at least one side of the second through parts in a fourth direction is correspondingly provided with the second gas guide parts, gas between two adjacent grid sheets of the first arc-extinguishing chamber is introduced into the second gas guide parts, and the fourth direction is intersected in the first direction and the arrangement direction of the grid sheets of the first arc-extinguishing chamber.

9. The circuit breaker according to claim 8, wherein,

the device also comprises two opposite side plates, the first arc extinguishing chamber and the second arc extinguishing chamber are arranged on the side plates,

the second insulating piece further comprises an end plate arranged on the second body, the end plate is arranged at one end of the second body in the lamination direction of the plurality of grid sheets of the first arc extinguishing chamber, and two opposite ends of the end plate along the fourth direction are respectively clamped with the two side plates.

10. The circuit breaker of claim 8, wherein the first arc chute includes first and second ends that are opposite in a lamination direction, the second arc chute includes third and fourth ends that are opposite in the lamination direction, a projection of the first arc chute in the first direction at the second arc chute covers the fourth end, a projection of the second arc chute in the first direction at the first arc chute covers the first end,

The second insulating part further comprises an air guide plate connected with the second body, the air guide plate comprises a fifth end and a sixth end, the fifth end is overlapped with the first end, the sixth end is overlapped with the fourth end, the air guide plate guides the air of the first arc extinguishing chamber to be discharged to the air outlet along the direction from the fifth end to the sixth end,

the first insulating piece extends from the third end to the fourth end and is provided with a limiting protrusion facing the sixth end, a limiting groove is formed on one side of the sixth end facing the fourth end, and the limiting groove is used for accommodating the limiting protrusion and limiting the limiting protrusion in the first direction.

11. The circuit breaker of claim 10, wherein the arc guide includes a seventh end disposed in a stacked relationship with the fourth end, the sixth end of the gas guide plate facing the second arc chute forming a slot on a side of the fourth end, the seventh end of the arc guide being capable of mating with the slot.

12. The circuit breaker of claim 1, further comprising two first arc gathering members symmetrically disposed and two second arc gathering members symmetrically disposed,

At least part of the first arc-gathering piece is arranged between the first arc-extinguishing chamber and the contact system, the first arc-gathering piece comprises second surfaces facing each other, a first narrow slit is formed between the two second surfaces of the two first arc-gathering pieces, so that an electric arc moves to the first arc-extinguishing chamber along the first narrow slit, one side of the first arc-gathering piece, which is opposite to the second surface in a fourth direction, is provided with first limit grooves which are in one-to-one connection with at least part of the grid plates of the first arc-extinguishing chamber, and the fourth direction is perpendicular to the first direction and the stacking direction of the grid plates of the first arc-extinguishing chamber;

the second arc-extinguishing device comprises a first arc-extinguishing chamber, a second arc-extinguishing member, a second limiting groove and a second limiting groove, wherein at least part of the second arc-extinguishing member is arranged between the first arc-extinguishing chamber and the second arc-extinguishing chamber, the second arc-extinguishing member comprises a third surface facing each other, a second narrow slit is formed between the two third surfaces of the second arc-extinguishing member, so that an electric arc moves to the second arc-extinguishing chamber along the second narrow slit, one side, opposite to the third surface, of the second arc-extinguishing member is provided with a second limiting groove which is in one-to-one connection with at least part of the grid plates of the second arc-extinguishing chamber, and the third direction is perpendicular to the stacking direction of the grid plates of the first arc-extinguishing chamber and the second arc-extinguishing chamber.

13. The circuit breaker of claim 12, wherein the fourth direction is parallel to the third direction, the first arc gathering member comprises a first arc gathering portion and a second arc gathering portion,

the first arc-gathering part is positioned between the first arc-extinguishing chamber and the contact system, the second arc-gathering part is positioned at one side of the first arc-extinguishing chamber in the stacking direction of the grid plates,

the second arc-gathering part is provided with a first step surface facing one end of the second arc-extinguishing chamber, the second arc-gathering part is provided with a second step surface facing one end of the contact system, and the first step surface and the second step surface are in butt fit to form a limit of the first arc-gathering part and the second arc-gathering part in the third direction.

14. The circuit breaker according to claim 1, wherein,

the contact system comprises a fixed contact, the fixed contact and the second arc extinguishing chamber are oppositely arranged in the first direction, the arc root of the fixed contact can be transferred to the second arc extinguishing chamber,

the static contact comprises a bearing plate, an arc blocking piece and a static contact, wherein the static contact is arranged on one side of the bearing plate facing the arc extinguishing assembly, the arc blocking piece is attached to one side of the bearing plate facing the arc extinguishing assembly and surrounds the static contact, and the arc blocking piece is used for preventing the arc root of the static contact from moving in the direction deviating from the second arc extinguishing chamber.