CN217544515U - Circuit breaker - Google Patents

Abstract

The application provides a circuit breaker, include: a contact system comprising a first contact and a second contact; the wiring device comprises a first terminal, a second terminal and an electric connector, wherein the first terminal is used for connecting an external circuit, and the first terminal is connected to the first contact through the electric connector; the arc extinguishing system comprises an arc extinguishing device, an arc striking device and an insulating piece, wherein the arc striking device comprises a first arc striking piece and a second arc striking piece, the first arc striking piece is connected with a first contact and is arranged opposite to a part of electric connecting pieces, the second arc striking piece can be electrically connected with a second contact so as to lead an arc into the arc extinguishing device, the insulating piece comprises a shell body and a separation part, and the shell body wraps the part of the first arc striking piece and the part of the electric connecting pieces so that the arc enters the arc extinguishing device along the first arc striking piece; the isolation portion is capable of electrically isolating the first arc ignition member and a part of the electrical connection member opposite to the first arc ignition member. The circuit breaker of this application embodiment eliminates the potential safety hazard between first striking spare and the electric connection piece, promotes the security performance of circuit breaker.

Description

Circuit breaker

Technical Field

The application relates to the technical field of circuit breakers, in particular to a circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. Generally, a circuit breaker uses an arc extinguishing chamber, in which metal grids arranged in a stacked manner are used to cut an arc, the long arc is forced to be divided into a plurality of sections of short arcs, and the arc voltage division and cooling are realized. The arc voltage drop is the voltage for maintaining the continuous arc, the lowest arc voltage in the air with the standard atmospheric pressure is dozens of volts, and when the arc enters enough arc extinguishing grid pieces and the power supply voltage is not enough to support the lowest arc voltage, the arc is extinguished. When the electric arc is extinguished, the metal grid piece helps the electric arc to cool, and the phenomenon that the voltage of the next cycle is punctured again to cause re-ignition is avoided.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a circuit breaker to at least, reduce the potential safety hazard that exists in the circuit breaker, promote the security performance of circuit breaker.

The embodiment of the application provides a circuit breaker, include:

the contact system comprises a first contact and a second contact, the second contact can rotate relative to the first contact to switch on or off a circuit, and when the circuit is switched off, an arc is generated between the second contact and the first contact;

the wiring device comprises a first terminal, a second terminal and an electric connector, wherein the first terminal is used for connecting an external circuit, and the first terminal is connected to the first contact through the electric connector;

an arc extinguishing system comprising an arc extinguishing device, an arc striking device and an insulating element, the arc extinguishing device and the arc striking device being electrically connectable, the arc striking device comprising a first arc striking member connected to the first contact and arranged opposite to part of the electrical connection member, and a second arc striking member electrically connectable to the second contact for introducing an arc into the arc extinguishing device,

the insulating part comprises a shell body and a separation part, and the shell body wraps part of the first arc striking part and part of the electric connecting part so that the electric arc enters the arc extinguishing device along the first arc striking part; the isolation portion is capable of electrically isolating the first arc ignition member and a part of the electrical connection member opposite to the first arc ignition member.

In some embodiments, the first arc striking part comprises a first arc striking part, a first connecting part and a second arc striking part which are sequentially connected, the first arc striking part is connected with the first contact, and the second arc striking part is stacked with the arc extinguishing device; the electric connecting piece comprises a first connecting end, a second connecting part and a second connecting end which are connected in sequence, the first connecting end is connected with the first contact, and the second connecting end is connected with the first wiring terminal; an accommodating channel is formed between the shell body and the isolating part and used for accommodating part of the first arc striking piece and part of the electric connecting piece and sequentially extends along the trend of the first connecting part, the first arc striking part, the first connecting end and the second connecting part so as to realize the electric isolation between the second connecting part and the first arc striking piece.

In some embodiments, the second connecting portion includes a first sub-portion, a second sub-portion and a third sub-portion which are sequentially connected in a bending manner, the first sub-portion is connected with the first connecting end in a bending manner, the third sub-portion is connected with the second connecting end in a bending manner, and the first sub-portion and the third sub-portion are oppositely arranged along the direction of the first contact and the first terminal; wherein, the isolation part extends to the bending part of the third subsection and the second connecting end.

In some embodiments, the shell body is formed with a first narrow slit extending along the first arc-striking portion and the first connecting portion, so that a side of the first arc-striking member facing the arc-extinguishing device is exposed from the first narrow slit.

In some embodiments, the arc extinguishing system comprises a housing, the housing has a containing cavity, the containing cavity comprises a first arc extinguishing zone and a second arc extinguishing zone which are arranged along a first direction, and a first contact and a second contact are positioned on one side of the first arc extinguishing zone far away from the second arc extinguishing zone in the containing cavity; the arc extinguishing device comprises a first arc extinguishing chamber, a second arc extinguishing chamber and a first arc guiding piece, wherein at least part of the first arc extinguishing chamber is positioned in a first arc extinguishing zone, at least part of the second arc extinguishing chamber is positioned in a second arc extinguishing zone, the first arc extinguishing chamber and the second arc extinguishing chamber are overlapped in projection on the shell along a first direction, and the first arc extinguishing chamber and the second arc extinguishing chamber can be electrically connected through the first arc guiding piece; the arc striking device is used for introducing electric arcs into the first arc extinguish chamber and the second arc extinguish chamber; the second arc ignition part and the second arc extinguish chamber are arranged in a stacked mode, and the first narrow gap is at least partially located in the first arc extinguish region so that an arc root of the first contact is led into the second arc ignition part along the first narrow gap.

In some embodiments, the arc extinguishing system further includes two arc isolating pieces arranged oppositely, each arc isolating piece includes a first arc isolating section, a second arc isolating section and a third arc isolating section which are connected in sequence, the first arc isolating section is located on one side, away from the second arc extinguishing chamber, of the first arc extinguishing chamber, the second arc isolating section is located on one side, close to the insulating piece, of the first arc extinguishing chamber, the third arc isolating section is located on one side, close to the first arc extinguishing chamber, of the second arc extinguishing chamber, and a portion of the third arc isolating section is clamped between the first arc extinguishing chamber and the second arc extinguishing chamber, so that the second arc extinguishing chamber and the first arc extinguishing chamber are electrically isolated from each other, a second narrow slit is formed between the two arc isolating pieces, and the first narrow slit is aligned with portions, corresponding to the second arc isolating section and the third arc isolating section, of the second narrow slit, so that an arc moves into the first arc extinguishing chamber and the second arc extinguishing chamber along the first narrow slit and the second narrow slit.

In some embodiments, the housing body forms a preformed hole for exposing the first contact, the preformed hole communicating with the first slot.

In some embodiments, the insulating member includes a first mounting portion and a second mounting portion, the first mounting portion and the second mounting portion being arranged and detachably connected along a second direction, wherein the second direction is perpendicular to the arrangement direction of the first arc-striking portion and the second arc-striking portion, wherein the first mounting portion and the second mounting portion together form the isolation portion and the first narrow slit.

In some embodiments, the first mounting portion includes a first clip member, the second mounting portion includes a second clip member, and the first mounting portion and the second mounting portion are snap-fitted by the first clip member and the second clip member.

In some embodiments, a side of the first mounting portion facing the second mounting portion is formed with a first step surface, a side of the second mounting portion facing the first mounting portion is formed with a second step surface, and the first step surface and the second step surface are fitted to each other.

The circuit breaker that this application embodiment provided utilizes the first arc starting piece of shell body parcel part and partial electric connector for electric arc gets into arc control device and then is quenched along the trend of first arc starting piece. And, through first striking spare and the electric connection piece of isolation portion electrical isolation, prevent that relative first striking spare that sets up and the part electric connection piece relative with first striking spare from being punctured by the electric arc, guarantee the safety of the two, eliminate the potential safety hazard between first striking spare and the electric connection piece, promote the security performance of circuit breaker.

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 diagram of a circuit breaker according to an embodiment of the present application;

figure 2 is a schematic view of a portion of the circuit breaker shown in figure 1;

figure 3 is a schematic view of a portion of the circuit breaker shown in figure 1;

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

FIG. 5 is a partial schematic view of the insulator shown in FIG. 4;

FIG. 6 is an exploded view of the insulator and electrical connector of FIG. 4;

fig. 7 is a partially exploded schematic view of an arc extinguishing system according to an embodiment of the present application;

FIG. 8 is a partial schematic illustration of the assembled arc extinguishing system of FIG. 7;

fig. 9 is a schematic structural view of an arc barrier in the arc extinguishing system shown in fig. 7;

FIG. 10 is a partial schematic view of the insulator shown in FIG. 4;

fig. 11 is a schematic structural view of an insulating member and a first arc striking member in the circuit breaker according to the embodiment of the present application;

fig. 12 is a partial schematic view of the assembled arc extinguishing system of fig. 7;

fig. 13 is a schematic view of a first insulator of the arc extinguishing system of fig. 7;

fig. 14 is an assembly schematic view of a first arc chute, a first insulator, and a first arc runner of the arc extinguishing system shown in fig. 7;

fig. 15 is a schematic view of a second insulating member of the arc extinguishing system shown in fig. 7;

fig. 16 is a schematic view of the first and second arc-extinguishing chambers of the arc-extinguishing system shown in fig. 7;

fig. 17 is a schematic view of the structure of a first grid of the first arc chute shown in fig. 16;

fig. 18 is a schematic structural view of a third grid of the second arc chute shown in fig. 16.

Fig. 19 is an assembled schematic view of the arc extinguishing system shown in fig. 7.

Reference numerals:

1. a housing;

11. a first arc extinguishing zone;

12. a second arc extinguishing zone;

131. a first side plate; 132. a second side plate; 133. mounting holes;

2. an arc extinguishing device;

21. a first arc-extinguishing chamber; 211. a first end; 212. a second end; 213. a first grid sheet; 214. a first body; 215. a first extension portion; 216. a first groove;

22. a second arc extinguishing chamber; 221. a third end; 222. a fourth end; 223. a second grid sheet; 224. a third grid sheet; 225. a second body; 226. a second extension portion; 227. a third groove;

23. a first arc guide member; 231. a first surface; 232. a second surface; 233. a first arc guiding section; 234. a first connection section; 235. a second connection section; 236. a second arc guiding section;

27. a first insulating member; 271. a first insulating section; 272. a second insulating segment; 273. a third insulating segment; 274. an arc blocking part; 275. a flow dividing section; 276. a first vent hole;

28. a second insulating member; 281. a second vent hole;

29. an arc-isolating piece; 291. a first arc-isolating section; 292. a second arc-isolating section; 293. a third arc-separating section; 294. a second narrow slit; 295. a first accommodating portion; 296. a second accommodating portion;

3. an arc striking device;

31. a first arc striking member; 313. a first arc striking part; 314. a first connection portion; 315. a second arc striking part;

32. a second arc striking member; 323. a jumping-over part; 324. a first guide part;

4. a wiring device;

41. a first terminal; 42. a second terminal; 43. an electrical connection; 431. a first connection end; 432. a second connecting portion; 433. a second connection end; 434. a first subsection; 435. a second subsection; 436. a third sub-segment;

5. an insulating member;

51. a housing body; 511. a first narrow slit; 512. reserving a hole; 513. a curved plate; 514. a first side panel; 515. a second side panel; 516. a third side panel; 52. an isolation section; 521. a closed ring structure; 522. an extension portion; 53. a receiving channel; 54. a first mounting portion; 541. a first clip member; 542. a first step surface; 543. a first mounting plate; 55. a second mounting portion; 551. a second clip member; 552. a second step surface; 553. a second mounting plate;

9. a contact system; 91. a first contact; 92. a second contact;

x, a first direction;

y, a second direction;

z, third direction.

Detailed Description

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

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the 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 following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed and removable connections as well as integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above 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 with reference to fig. 1 to 19.

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present application, fig. 2 is a schematic partial structural diagram of the circuit breaker shown in fig. 1, fig. 3 is a schematic partial structural diagram of the circuit breaker shown in fig. 1, fig. 4 is a schematic structural diagram of an insulating member and a first arc striking member in the circuit breaker according to the embodiment of the present application, and fig. 5 is a schematic partial structural diagram of the insulating member shown in fig. 4.

Referring to fig. 1 to 5, an embodiment of the present application provides a circuit breaker, which includes a contact system 9, a wiring device 4, and an arc extinguishing system. The circuit breaker comprises a housing for accommodating the contact system 9, the arc extinguishing system and the wiring device 4. The shell is provided with an exhaust port for exhausting gas generated when the arc extinguishing system extinguishes the arc.

The contact system 9 comprises a first contact 91 and a second contact 92, the second contact 92 being rotatable with respect to the first contact 91 to close or open an electric circuit, an arc being generated between the second contact 92 and the first contact 91 when the electric circuit is opened.

Optionally, the first contact 91 is a fixed contact, and the second contact 92 is a movable contact. The first contact 91 may be a movable contact.

The wiring device 4 includes a first terminal 41 for connecting an external circuit, a second terminal 42, and an electrical connector 43, the first terminal 41 being connected to the first contact 91 through the electrical connector 43.

One of the first terminal 41 and the second terminal 42 is used for connecting the positive pole of an external circuit, and the other is used for connecting the negative pole of the external circuit. The first terminal 41 is connected to the first contact 91, and the second terminal 42 is connected to the second contact 92. When the first contact 91 and the second contact 92 are in contact, the external circuit is completed. When the first contact 91 and the second contact 92 are separated, the external circuit is opened.

The arc extinguishing system comprises an arc extinguishing device 2, an arc striking device 3 and an insulating piece 5, wherein the arc extinguishing device 2 and the arc striking device 3 can be electrically connected, the arc striking device 3 comprises a first arc striking piece 31 and a second arc striking piece 32, the first arc striking piece 31 is connected with a first contact 91 and is arranged opposite to a part of the electric connecting piece 43, the second arc striking piece 32 can be electrically connected with a second contact 92, and the first arc striking piece 31 and the second arc striking piece 32 can guide an arc into the arc extinguishing device 2.

The insulating member 5 includes a case body 51 and a partition 52, the case body 51 wrapping a part of the first arc ignition member 31 and a part of the electrical connection member 43 to allow the arc to enter the arc extinguishing device 2 along the first arc ignition member 31; the isolation portion 52 can electrically isolate the first ignition member 31 and a part of the electrical connection member 43 opposite to the first ignition member 31.

It should be noted that the first arc ignition member 31 and the part of the electrical connection members 43 opposite to the first arc ignition member 31 are oppositely arranged along the third direction Z.

Wherein, the insulating part 5 is made of insulating material.

The housing body 51 encloses a part of the first arc ignition member 31 and a part of the electrical connection member 43 so that the arc enters the arc extinguishing device 2 along the first arc ignition member 31, avoiding the arc moving in the opposite direction causing the arc to persist and burning the corresponding parts. Moreover, the case body 51 covers part of the first arc striking part 31 and part of the electric connecting part 43, and also insulates the first arc striking part 31 and the electric connecting part 43 from the inner wall of the case of the circuit breaker, thereby preventing the electric arc from contacting the inner wall of the case through the electric connecting part 43 and the first arc striking part 31 to cause damage to the inner wall of the case.

The existing circuit breaker has limited space, so that the first arc striking part 31 and the electric connecting part 43 have the risk of arc breakdown in the opposite directions of the first arc striking part and the electric connecting part and between the positions with close distance, and have potential safety hazards.

The circuit breaker that this application embodiment provided utilizes shell body 51 parcel part first striking piece 31 and part electric connector 43 for the electric arc gets into arc control device 2 and then is extinguished along the trend of first striking piece 31. And, through the isolation part 52 electrically isolating the first arc ignition member 31 and the electric connector 43, the breakdown of the first arc ignition member 31 and the part of the electric connector 43 opposite to the first arc ignition member 31 is prevented, the safety of the first arc ignition member 31 and the electric connector 43 is ensured, and the potential safety hazard between the first arc ignition member 31 and the electric connector 43 is eliminated. In addition, the circuit breaker provided by the embodiment of the application utilizes the insulating member 5 to electrically isolate the first arc striking member 31 from the inner wall of the shell and the electric connecting member 43 from the inner wall of the shell, so that the arc is prevented from being transferred to the inner wall of the shell by the first arc striking member 31 and the electric connecting member 43, the shell is prevented from being damaged, and the safety of the shell is ensured.

In some embodiments, the first arc striking part 31 includes a first arc striking portion 313, a first connection portion 314, and a second arc striking portion 315, which are connected in sequence, the first arc striking portion 313 is connected to the first contact 91, and the second arc striking portion 315 is stacked with the arc extinguishing device 2. The electric connector 43 includes a first connection end 431, a second connection portion 432 and a second connection end 433 which are connected in sequence, the first connection end 431 is connected with the first contact 91, and the second connection end 433 is connected with the first terminal 41; a receiving channel 53 is formed between the shell body 51 and the isolation portion 52, and the receiving channel 53 is used for receiving a part of the first arc-striking piece 31 and a part of the electrical connector 43 and extends along the first connecting portion 314, the first arc-striking portion 313, the first connecting end 431 and the second connecting portion 432 in sequence to realize electrical isolation between the second connecting portion 432 and the first arc-striking piece 31.

Since the second arc striking portion 315 is stacked on the arc extinguishing device 2, one surface of the second arc striking portion 315 facing the arc extinguishing device 2 needs to be entirely exposed, and the second arc striking portion 315 is not located in the accommodating passage 53, that is, the side of the second arc striking portion 315 facing the arc extinguishing device 2 is not covered by the case body 51 and the separating portion 52.

In one embodiment, the second arc striking portion 315 and the first connection portion 314 are bent toward a side toward the arc extinguishing device 2, and the first connection portion 314 and the first arc striking portion 313 are bent toward a side away from the arc extinguishing device 2. Further, the included angle formed by bending the second arc-striking portion 315 and the first connection portion 314 is an obtuse angle, and the included angle formed by bending the first connection portion 314 and the first arc-striking portion 313 is an obtuse angle.

In one embodiment, the first and second arc-striking parts 313 and 315 are plate-shaped structures, and both are parallel to the first direction X. I.e. both sides of the plate-like structure extend in the first direction X.

In one embodiment, the included angle between the second arc-striking portion 315 and the first connection portion 314 ranges from 110 ° to 130 °.

The included angle between the second arc striking portion 315 and the first connection portion 314 is set to 110 ° to 130 °, so that the arc has a sufficient distance to enter the grid of the arc extinguishing device 2 more easily. When the included angle is smaller than 110 °, for example, the included angle is inclined to 90 °, the elongation of the arc is affected, and the arc is not easy to enter the arc extinguishing device 2, and even stays in the second arc striking portion 315 without being cut. When the contained angle of the two is greater than 130 °, the angle is too slow, then can increase the volume of first striking piece 31, and then increase arc extinguishing system's volume, but the space size that general circuit breaker left arc extinguishing system for is fixed, the increase of arc extinguishing system volume then can lead to it can't install in the circuit breaker and then can't be used, and, second striking portion 315 still can lead to the electric arc by first striking portion 313 with the angle of first connecting portion 314 too big, the route overlength of first connecting portion 314 to second striking portion 315, it is difficult to walk the arc.

In one embodiment, the first arcing section 313 is threadedly coupled to the first contact 91. Of course, other connection methods such as welding may be used.

In one embodiment, the first connection end 431 is threadably connected with the first contact 91. Of course, other connection methods such as welding may be used.

The second connection end 433 is connected to the first connection end 41, the first connection end 431 is connected to the first contact 91, the second connection end 433 and the first contact 91 are oppositely arranged along the first direction X, an arc running space is formed between the second connection end 433 and the first connection end 431, and the first arc striking part 31 is located in the space. Wherein the third direction Z is perpendicular to the first direction X. Specifically, the second connecting portion 432 is formed into a substantially U-shaped structure, and the first arc ignition member 31 is located in a recessed space defined by the U-shaped structure. The first arc ignition portion 313 is connected to the first connection end 431, so that the first arc ignition member 31 and the electrical connection member 43 are enclosed to form an annular structure having an opening, which is a gap extending along the first direction X formed between one end of the second arc ignition portion 315 departing from the first arc ignition portion 313 and the second connection portion 432. A portion of the isolation portion 52 is located in the space enclosed by the annular structure, and another portion of the isolation portion 52 protrudes through the opening and extends along the second connection portion 432, so as to electrically isolate a portion of the second connection portion 432 opposite to the third direction Z from the first arc ignition element 31. Wherein another portion of the isolation portion 52 protrudes through the opening and extends along the second connection portion 432, preventing the second arc portion 315 and a portion of the second connection portion 432 opposite to the second arc portion 315 in the first direction X from being arc broken.

A receiving channel 53 is defined between the housing body 51 and the isolation portion 52 for electrically isolating the second connecting portion 432 from the first arc striking member 31 to prevent the two from being damaged by arc breakdown. Specifically, the case body 51 is enclosed outside the partition portion 52, and not only is the accommodating passage 53 enclosed with the partition portion 52, but also the arc is prevented from contacting the inner wall of the case through the electric connecting member 43 and the first arc ignition member 31, causing damage to the inner wall of the case.

In one embodiment, the isolation portion 52 includes a closed loop structure 521 and an extension portion 522, the closed loop structure 521 matches with a cavity surrounded by the first connection portion 314, the first arc ignition portion 313 and a part of the second connection portion 432, and the extension portion 522 extends from the closed loop structure 521 to the second connection end 433 along the direction of the second connection portion 432.

Providing the isolation portion 52 in the form of a closed ring structure 521 in combination with the extension portion 522 not only ensures electrical isolation of the first ignition part 31 and the electrical connection member 43, but also makes full use of the space between the first ignition part 31 and the electrical connection member 43, improving the structural strength of the electrical insulation member 5.

Fig. 6 is an exploded view of the insulator and electrical connector of fig. 4.

Referring to fig. 6, in some embodiments, the second connecting portion 432 includes a first sub-segment 434, a second sub-segment 435, and a third sub-segment 436 that are sequentially connected in a bent manner, the first sub-segment 434 is connected with the first connecting end 431 in a bent manner, the third sub-segment 436 is connected with the second connecting end 433 in a bent manner, and the first sub-segment 434 and the third sub-segment 436 are oppositely disposed along the direction of the first contact 91 and the first terminal 41; the isolation portion 52 extends to the bent portion of the third sub-section 436 and the second connection end 433. Specifically, the extension portion 522 extends to the bent portion of the third sub-segment 436 and the second connection end 433.

The isolation portion 52 extends to the bent portion of the third subsection 436 and the second connection end 433 to ensure the electrical isolation between the third subsection 436 and the second subsection 435 and the second arc-striking portion 315.

In one embodiment, the bending angle between the first sub-segment 434 and the first connection end 431 is 90 °, the bending angle between the second sub-segment 435 and the first sub-segment 434 is 90 °, the bending angle between the third sub-segment 436 and the second sub-segment 435 is an obtuse angle, and the bending angle between the third sub-segment 436 and the second connection end 433 is an obtuse angle. The bending angle of 90 ° refers to the degree of the included angle formed by the two, but the bending form of the two is not limited, and for example, the two may be in a form of a rounded structure to form a right angle, or may be in a form of a right angle directly.

In one embodiment, the first arc-striking portion 313, the second arc-striking portion 315, and the second sub-segment 435 are parallel to each other and parallel to the first direction X.

Specifically, the portions of the first connection portion 314, the first arc-leading portion 313, the first connection end 431, the first sub-portion 434 and the second sub-portion 435, which are opposite to the first connection portion 314 and the first arc-leading portion 313, are surrounded to form the cavity, and the shape and the size of the closed ring-shaped structure 521 are matched with the cavity, that is, the closed ring-shaped structure 521 is filled in the cavity, and the size of the closed ring-shaped structure 521 is slightly smaller than the size of the cavity. The extension 522 extends from the closed loop structure 521 to the second connection end 433 along a portion of the second subsection 435 opposite the second arc initiation 315 and the third subsection 436.

Referring to fig. 4, in some embodiments, the housing body 51 is formed with a first slit 511, and the first slit 511 extends along the first arc-striking portion 313 and the first connecting portion 314, so that a side of the first arc-striking member 31 facing the arc-extinguishing device is exposed from the first slit 511.

In one embodiment, the first slot 511 extends along a central position of the first arc ignition member 31.

Through setting up first slot 511 for the arc root of electric arc moves to second arc portion 315 along first slot 511 from first contact 91, and then guides electric arc and gets into arc extinguishing device 2, and so, can make the arc root of electric arc walk according to first slot 511 for walking speed, and then accelerate arc extinguishing efficiency, avoid the arc root to walk to other border position of first arc piece 31 and influence arc extinguishing efficiency.

Fig. 7 is a partially exploded view of an arc extinguishing system according to an embodiment of the present application.

In some embodiments, the arc extinguishing system comprises a housing 1, the housing 1 having a receiving cavity, the receiving cavity comprising a first arc extinguishing zone 11 and a second arc extinguishing zone 12 arranged along a first direction X, the first contact 91 and the second contact 92 being located in the receiving cavity on a side of the first arc extinguishing zone 11 away from the second arc extinguishing zone 12. I.e. the contact system 9, the first extinguishing zone 11 and the second extinguishing zone 12 are arranged in sequence along the first direction X. The exhaust port is communicated with the second arc extinguishing zone 12, namely, is positioned on one side of the second arc extinguishing zone 12 far away from the first arc extinguishing zone 11.

The arc extinguishing device 2 comprises a first arc extinguishing chamber 21 located in at least part of the first arc extinguishing zone 11, a second arc extinguishing chamber 22 located at least part of the second arc extinguishing zone 12, and a first arc guiding piece 23, wherein the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 are overlapped in a projection on a first plane along the first direction X, and the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 can be electrically connected through the first arc guiding piece 23. Wherein the first plane is perpendicular to the first direction. The electrical connection means that an arc is generated when the first contact 91 and the second contact 92 are disconnected, and the arc forms an arc current in each member to close a circuit, thereby forming an electrical connection.

In one embodiment, the projections of the first arc chute 21 and the second arc chute 22 on the first plane along the first direction X partially overlap.

In another embodiment, the projection of the second arc chute 22 onto the first plane along the first direction X completely covers the projection of the first arc chute 21 onto the first plane along the first direction X.

In another embodiment, the projection of the first arc chute 21 onto the first plane along the first direction X completely covers the projection of the second arc chute 22 onto the first plane along the first direction X.

In one embodiment, the first and second arc-extinguishing chambers 21, 22 are stacked along a third direction Z, perpendicular to the first direction X. Of course, the stacking direction of the first arc-extinguishing chamber 21 and the stacking direction of the second arc-extinguishing chamber 22 respectively form an angle with the first direction X, which may also be other angles, for example, 80 ° to 100 °, that is, the stacking directions of the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 may be different. Wherein, the stacking direction of first explosion chamber 21 and the stacking direction of second explosion chamber 22 respectively with first direction X become the contained angle and need satisfy the requirement that electric arc can be cut by the two.

Further, the range of an included angle between the stacking direction of the first arc-extinguishing chamber 21 and the stacking direction of the second arc-extinguishing chamber 22 is 0 ° to 10 °. Wherein, the angle between the stacking direction of the first arc-extinguishing chamber 21 and the stacking direction of the second arc-extinguishing chamber 22 is required to satisfy the requirement that the arc can be cut by both.

The arc ignition device 3 serves to introduce an arc into the first arc chute 21 and the second arc chute 22.

It should be noted that the arc entering the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 means that the arc is simultaneously cut by the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22, and the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 are electrically connected in series.

The second arc ignition part 315 is stacked with the second arc-extinguishing chamber 22, the first narrow slit 512 is at least partially located in the first arc-extinguishing zone 11, to direct the arc root of the first contact 91 along the first slot 512 into the second arc striking portion 315.

It should be noted that the first narrow slit 512 may be partially located in the first arc-extinguishing region 11 and partially located in the second arc-extinguishing region 12; or may be located entirely within the first arc-extinguishing zone 11.

The arc root of the first contact 91 is led into the second arc striking part 315 along the first narrow slit 512, so that the arc is cut by the second arc extinguishing chamber 22, and the arc extinguishing efficiency of the second arc extinguishing chamber 22 is accelerated.

In the process of breaking the circuit, the first contact 91 and the second contact 92, the arc current formed by the arc flows from the first contact 91 to the arc striking device 3, the arc extinguishing device 2, the arc striking device 3 and the second contact 92 in sequence, or flows from the second contact 92 to the arc striking device 3, the arc extinguishing device 2, the arc striking device 3 and the first contact 91 in sequence, and no matter the direction of the arc current, the magnetic field generated by the magnetic field enables the arc to be blown to the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 along the first direction X, that is, under the action of other arc blowing devices, the arc can still be introduced into the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 for arc extinguishing by virtue of the self-blowing action of the arc current and the guiding action of the arc striking device 3.

The arc extinguishing system of circuit breaker that this application embodiment provided includes first explosion chamber 21 and second explosion chamber 22, and the two sets up in first direction X is crisscross. The space has been saved greatly to the arrangement mode of crisscross setting, so the arc extinguishing system of circuit breaker that this application embodiment provided has arranged two explosion chambers to carry out the arc extinguishing in having utilized the finite space in the casing 1, greatly increased the quantity of bars piece, is showing and is improving the arcing pressure drop, has promoted the breaking capacity of arc extinguishing system, satisfies the user demand of the alternating current-direct current system of high voltage level completely.

Fig. 8 is a partial structural view of the assembled arc extinguishing system shown in fig. 7, and fig. 9 is a structural view of an arc barrier in the arc extinguishing system shown in fig. 7.

Referring to fig. 8 and 9, in some embodiments, the arc extinguishing system further includes two arc barriers 29 disposed opposite to each other, each arc barrier 29 includes a first arc barrier 291, a second arc barrier 292, and a third arc barrier 293 connected in sequence, the first arc barrier 291 is located on a side of the first arc extinguishing chamber 21 away from the second arc extinguishing chamber 22, the second arc barrier 292 is located on a side of the first arc extinguishing chamber 21 close to the insulating member 5, the third arc barrier 293 is located on a side of the second arc extinguishing chamber 22 close to the first arc extinguishing chamber 21, a portion of the first arc barrier 291 is sandwiched between the first arc guiding member 23 and the second arc extinguishing chamber 22, and a portion of the third arc barrier 293 is sandwiched between the first connecting portion 314 and the second arc extinguishing chamber 22, wherein a second narrow gap 294 is formed between the two arc barriers 29, and the first narrow gap 511 is aligned with a portion of the second arc barrier 292 and the third arc barrier 293 in the second narrow gap 294, so that an arc moves into the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 along the first narrow gap 512 and the second narrow gap 294. Wherein, the arc-isolating piece 29 is made of insulating material.

In one embodiment, the arc separator 29 is made of a gas generating material. The arc-insulating members 29 can be made of melamine, for example. The arc isolating piece 29 is made of gas generating material, and the generated gas is beneficial to arc blowing, so that the arc extinguishing efficiency is accelerated.

In one embodiment, the first arc chute 291 extends partially into the first arc chute 21.

In one embodiment, the second arc chute 292 extends partially into the second arc chute 22.

In one embodiment, the third arc separating segment 293 extends partially into the second arc chute 22.

When the circuit breaker is just switched off, an arc generated between the first contact 91 and the second contact 92 moves into the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 along the second narrow slit 294 and the first narrow slit 512 between the two arc-isolating pieces 29, and does not move to other positions, such as the edge position of the first arc-striking piece 31 in the width direction or other non-narrow slit positions, so that the first arc only moves along the first narrow slit 512 and the second narrow slit 294, the moving process is accelerated, and the arc-extinguishing efficiency is improved.

Referring to fig. 4 and 6, in some embodiments, the housing body 51 forms a preformed hole 512 for exposing the contact of the first contact 91, and the preformed hole 512 is in communication with the first slit 512.

In one embodiment, the preformed hole 512 is rectangular in shape. Of course, the preformed hole 512 may have other shapes, such as a circular shape, which is not limited herein.

By providing the preformed hole 512 and communicating it with the first narrow slit 511, the arc root on the first contact 91 can be transferred to the first arc striking part 31 and travel along the first arc striking part 31, and then the arc enters the second arc extinguishing chamber 22 to be extinguished.

Fig. 10 is a partial structural view of the insulating member shown in fig. 4.

Referring to fig. 10, in some embodiments, the insulating member 5 includes a first mounting portion 54 and a second mounting portion 55, and the first mounting portion 54 and the second mounting portion 55 are arranged and detachably connected along a second direction Y, wherein the second direction Y is perpendicular to the arrangement direction of the first arc guiding portion 313 and the second arc guiding portion 315, and the first mounting portion 54 and the second mounting portion 55 together form a separating portion 52 and a first narrow slit 511.

It should be noted that, since the first arc striking portion 313 is connected to the first contact 91, the second arc striking portion 315 is stacked on the second arc extinguishing chamber 22, and the first contact 91 and the second arc extinguishing chamber 22 are arranged along the first direction X, therefore, the arrangement direction of the first arc-striking portion 313 and the second arc-striking portion 315 is also the first direction X, and the second direction Y is perpendicular to the first direction X.

It should be noted that the first mounting portion 54 and the second mounting portion 55 respectively have a portion of the housing body 51 and a portion of the partition portion 52, and the first mounting portion 54 and the second mounting portion 55 are connected to form the housing body 51, the partition portion 52 and the first narrow slit 511. Further, the partition portion 52 includes a closed ring structure 521 and an extension portion 522, and the first mounting portion 54 and the second mounting portion 55 have a portion of the closed ring structure 521 and a portion of the extension portion 522, respectively.

In one embodiment, the first and second mounting portions 54 and 55 are equal in width along the second direction Y.

The insulator 5 is configured to include the first mounting portion 54 and the second mounting portion 55, and to be detachably connected, and in this way, the first ignition member 31, the electric connection member 43, and the insulator 5 are easily assembled. Specifically, after the first arc striking member 31, the electrical connection member 43, the first terminal 41, and the first contact 91 are fixedly connected, the first mounting portion 54 and the second mounting portion 55 are inserted into corresponding positions and then assembled, and the assembly and disassembly are extremely convenient.

Specifically, the first mounting portion 54 and the second mounting portion 55 can be detachably connected, and can be in a threaded connection or a clamping connection.

In some embodiments, the first mounting portion 54 includes a first clip 541, the second mounting portion 55 includes a second clip 551, and the first mounting portion 54 and the second mounting portion 55 are snap-fitted by the first clip 541 and the second clip 551.

First installation department 54 and second installation department 55 are fixed through first joint spare 541 and the complex mode of second joint spare 551 joint, and it is all extremely convenient to install and dismantle, and user experience is good.

In one embodiment, the first clip member 541 is a buckle or a slot, and the second clip member 551 is a slot or a buckle. Of course, the first clip member 541 and the second clip member 551 may also adopt other clip-fit structures, and the application is not limited herein.

Of course, the first and second mounting portions 54 and 55 may be detachably connected by other methods, such as riveting.

In another embodiment, the first mounting portion 54 and the second mounting portion 55 are joined by gluing.

In one embodiment, the isolating portion 52 of the first mounting portion 54 has a plurality of first mounting plates 543 disposed in the cavity of the closed ring structure 521, and the first engaging member 541 is disposed on a side of the first mounting plates 543 facing the second mounting portion 55. A plurality of second mounting plates 553 are arranged in the cavity of the closed ring structure 521 in the isolation part 52 of the second mounting part 55, and the second clamping pieces 551 are arranged on one sides of the second mounting plates 553 facing the first mounting part 54.

Because the space occupied by the partition portion 52 is large, the first clamping pieces 541 and the second clamping pieces 551 are arranged in the partition portion 52, the space is fully utilized, and the quantity requirements of the first clamping pieces 541 and the second clamping pieces 551 are further ensured.

In some embodiments, a first step surface 542 is formed on a side of the first mounting portion 54 facing the second mounting portion 55, a second step surface 552 is formed on a side of the second mounting portion 55 facing the first mounting portion 54, and the first step surface 542 and the second step surface 552 are fitted to each other.

It should be noted that, both the first step surface 542 and the second step surface 552 are step surfaces, and the number thereof is not limited, and may be one or two.

In one embodiment, the first mounting portion 54 is formed with a first step surface 542 on a side of the case body 51 and the partition portion 52 facing the second mounting portion 55, and the second mounting portion 55 is formed with a second step surface 552 on a side of the case body 51 and the partition portion 52 facing the first mounting portion 54. It should be noted that the first step surface 542 and the second step surface 552 are formed only at positions where the first mounting portion 54 and the second mounting portion 55 contact each other.

The first mounting portion 54 and the second mounting portion 55 are mutually embedded through the first step surface 542 and the second step surface 552, so that not only can alignment be facilitated during mounting, but also the sealing performance of the joint position of the first mounting portion and the second mounting portion can be ensured, and the effect of electrically isolating the first arc striking piece 31 from the electric connecting piece 43 can be ensured.

Fig. 11 is a schematic structural view of an insulating member and a first arc ignition member in the circuit breaker according to the embodiment of the present application.

Referring to fig. 11, in some embodiments, the housing body 51 includes a curved plate 513 having a first narrow slit 511, and a first side panel 514, a second side panel 515, and a third side panel 516 that are located on a side of the curved plate 513 away from the second contact 92, where the first side panel 514 and the second side panel 515 are disposed opposite to each other along the second direction Y, the isolation portion 52 is connected between the first side panel 514 and the second side panel 515, and the third side panel 516 is connected to an end portion of the first side panel 514 and the second side panel 515 that is located on the same side as the first contact 41.

In one embodiment, the first side panel 514 and the second side panel 515 are symmetrically disposed.

The curved plate 513, the first side plate 514, the second side plate 515 and the third side plate 516 cover most of the isolation portion 52 and most of the electrical connection members 43, so that the first arc striking member 31 is insulated from the inner wall of the housing, and the electrical connection members 43 are insulated from the inner wall of the housing, thereby ensuring the safety of the inner wall of the housing.

In some embodiments, the first arc chute 21 includes a first end 211 and a second end 212 opposite to each other in the stacking direction, the second arc chute 22 includes a third end 221 and a fourth end 222 opposite to each other in the stacking direction, the second end 212 and the third end 221 can be electrically connected through the first arc guide 23, the first end 211 can be electrically connected with the second contact 92, the fourth end 222 can be electrically connected with the first contact 91, the first end 211 protrudes beyond the third end 221 in a direction in which the second end 212 points to the first end 211, the fourth end 222 protrudes beyond the second end 212 in a direction in which the third end 221 points to the fourth end 222, and a projection of the first arc chute 21 onto the first plane along the first direction X covers a projection of the third end 221 onto the first plane along the first direction X.

Set up first explosion chamber 21 and second explosion chamber 22 as the structure form that interlocks each other, and the first end 211 of first explosion chamber 21 surpasss the third end 221 of second explosion chamber 22 in the direction that second end 212 points to first end 211, and the fourth end 222 of second explosion chamber 22 surpasss first explosion chamber 21 second end 212 in the direction that third end 221 points to fourth end 222, so set up, then first arc extinguishing area 11 has the blank area relative at first direction X with second explosion chamber 22, and electric arc can get into second explosion chamber 22 from this blank area more easily and cut. Furthermore, the second arc extinguishing zone 12 also has a free area facing the first arc extinguishing chamber 21 in the first direction X, through which the gas generated after the arc cutting in the first arc extinguishing chamber 21 is more easily exhausted.

Fig. 12 is a partial schematic view of the assembled arc extinguishing system of fig. 7.

Referring to fig. 12, in some embodiments, the arc extinguishing system may further include a first insulating member 27, where the first insulating member 27 is attached to the first arc guiding member 23, and is used to electrically isolate the first arc extinguishing chamber 21 from a portion of the first arc guiding member 23 opposite to the first arc extinguishing chamber 21 along the first direction X and prevent a back breakdown of the first arc extinguishing chamber 21.

Under the magnetic blow effect, the electric arc is blown to the first arc extinguish chamber 21 and the second arc extinguish chamber 22 from the position of the contact system 9 along the first direction X, in the first arc extinguish chamber 21, the electric arc still bends towards the second arc extinguish region 12 under the magnetic blow effect, and thus, the electric arc under the magnetic blow effect is easily blown to the outside of the first arc extinguish chamber 21 to cause the electric arc to be punctured outside the first arc extinguish chamber 21, and even possibly contacts with the first arc guide member 23 to cause short circuit, so that the electric arc cannot be cut by all grid pieces of the first arc extinguish chamber 21, and therefore, the first insulating member 27 is arranged, the first arc extinguish chamber 21 and the first arc guide member 23 are mutually insulated from the part opposite to the first arc extinguish chamber 21 in the first direction X, the short circuit can be avoided, the back puncture of the first arc extinguish chamber 21 is also prevented, the electric arc is guaranteed to be completely cut by the first arc extinguish chamber 21, and the arc extinguish effect is guaranteed. Wherein a portion of the first arc guiding member 23 directly opposite to the first arc chute 21 in the first direction X comprises a first connecting section 234.

It should be noted that the width of the first insulating member 27 should be wider than the width of the first arc guiding member 23, so as to prevent the exposed portion of the first arc guiding member 23 from being short-circuited with the grid of the first arc extinguishing chamber 21, that is, the length of the first insulating member 27 along the second direction Y is greater than the length of the first arc guiding member 23 along the second direction Y, so as to ensure complete insulation between the first arc extinguishing chamber 21 and the portion of the first arc guiding member 23 opposite to the first arc extinguishing chamber 21 in the first direction X.

In some embodiments, the first arc guiding member 23 has a first surface 231 and a second surface 232 which are opposite to each other, the first arc guiding member 23 includes a first arc guiding section 233, a first connecting section 234, a second connecting section 235 and a second arc guiding section 236 which are sequentially connected in a bending manner, the first arc guiding section 233 and the first connecting section 234 are bent toward the first surface 231, the first connecting section 234 and the second connecting section 235 are bent toward the second surface 232, the second connecting section 235 and the second arc guiding section 236 are bent toward the second surface 232 and form a containing cavity, the first arc guiding section 233 and the third end 221 are stacked, the first arc guiding section 233 first surface 231 faces the second arc extinguishing chamber 22, the second arc guiding section 236 and the second end 212 are stacked, and the second arc guiding section 236 first surface 231 faces the first arc extinguishing chamber 21.

In one embodiment, the first conductive arc segment 233, the second connecting segment 235, and the second conductive arc segment 236 are parallel to each other. Further, the first arc guiding section 233, the second connecting section 235 and the second arc guiding section 236 are all plate-shaped structures, and all of the three sections are parallel to the first direction X.

Set up first arc piece 23 of leading to first arc 233 to buckle the connection in proper order, first linkage segment 234, second linkage segment 235 and second arc 236 of leading, and make first arc 233 and the range upon range of setting of second explosion chamber 22 of leading, second arc 236 and the range upon range of setting of first explosion chamber 21 of leading, first arc 233 and the second explosion chamber 22 of leading has the clearance between the grid piece adjacent with it, second arc 236 and the first explosion chamber 21 of leading have the clearance between the grid piece adjacent with it, the existence in clearance has improved arc voltage drop, and then has improved arc extinguishing system's disjunction ability.

Fig. 13 is a schematic view of a first insulating member of the arc extinguishing system shown in fig. 7.

Referring to fig. 13, in some embodiments, the first insulating member 27 includes a first insulating segment 271, a second insulating segment 272, and a third insulating segment 273, which are sequentially connected in a bending manner, the first insulating segment 271 is attached to the second surface 232 of the first conducting segment 233, the second insulating segment 272 is attached to the second surface 232 of the first connecting segment 234, and the third insulating segment 273 is located in the accommodating cavity.

The first insulating part 27 is attached to the side of the first arc guiding part 23 facing the first arc extinguishing chamber 21, which not only plays an insulating role, but also saves space.

Fig. 14 is an assembly view of the first arc chute, the first insulator, and the first arc runner of the arc extinguishing system shown in fig. 7.

Referring to fig. 14, in one embodiment, the width of the first insulating segment 271 is greater than the width of the first conducting arc segment 233, the width of the second insulating segment 272 is greater than the width of the first connecting segment 234, and the width of the third insulating segment 273 is greater than the width of any one of the second connecting segment 235 and the second conducting arc segment 236. With such an arrangement, mutual insulation between the first connecting section 234 of the first arc guiding member 23 and the first arc extinguishing chamber 21 can be sufficiently ensured, and an arc on a grid sheet in the middle of the first arc extinguishing chamber 21 is prevented from passing through a side end face of the first insulating member 27 and entering the first connecting section 234 of the first arc guiding member 23, so as to avoid a short circuit. While also avoiding arcing through the receiving cavity between the second connecting segment 235 and the second conducting segment 236.

In one embodiment, the first insulating segment 271, the second insulating segment 272, and the third insulating segment 273 are each a plate-like structure. Further, the first insulating segment 271 and the third insulating segment 273 are parallel to each other and to the first direction X.

In some embodiments, the first insulating member 27 further includes an arc blocking portion 274 and a shunting portion 275, the arc blocking portion 274 is disposed at a bending position of the second insulating segment 272 and the third insulating segment 273 and is located at a side of the first arc-extinguishing chamber 21 close to the second arc-extinguishing area 12, and is used for blocking a phenomenon that an arc in the first arc-extinguishing chamber 21 moves to an outside of the first arc-extinguishing chamber 21 to form back breakdown, the arc blocking portion 274 is formed with a plurality of first vent holes 276 adapted to the first arc-extinguishing chamber 21, a gas generated by an arc in the first arc-extinguishing chamber 21 can flow to the second arc-extinguishing area 12 along the second insulating segment 272 through the first vent holes 276, and the shunting portion 275 is disposed at a side of the first insulating segment 271 away from the first arc-guiding segment 233 and is used for shunting the gas generated by the arc.

In another embodiment, the arc blocking portion 274 is formed with a plurality of first venting grooves adapted to the first arc extinguishing chamber 21, through which the gas generated by the arc in the first arc extinguishing chamber 21 can flow along the second insulating section 272 towards the second arc extinguishing zone 12.

Through setting up arc blocking portion 274, with the electric arc separation in first explosion chamber 21, avoid electric arc motion to first explosion chamber 21 to be close to one side of second explosion chamber 22 and cause the condition of puncturing behind one's back to take place to electric arc is cut by first explosion chamber 21 completely, improves the arc extinguishing ability of first explosion chamber 21, avoids the condition of puncturing behind one's back of first explosion chamber 21 to take place. Set up reposition of redundant personnel portion 275, the gas that electric arc produced shunts through reposition of redundant personnel portion 275, can be according to the size of adjustment reposition of redundant personnel portion 275, and then adjusts the area of giving vent to anger of the gas of first explosion chamber 21 in reposition of redundant personnel portion 275 department, adjusts the area proportion of giving vent to anger of first explosion chamber 21 and second explosion chamber 22 promptly to make the effect of giving vent to anger of first explosion chamber 21 and second explosion chamber 22 reach best. Moreover, the configuration of the diverter 275 provides structural support for the arc 274.

In one embodiment, the arc blocking portion 274 has a plate-like structure, and is attached to an end surface of the first arc-extinguishing chamber 21 facing the second arc-extinguishing region 12. The plurality of first vent holes 276 of the arc blocking portion 274 communicate with the first gap between any adjacent two grids in the first arc extinguishing chamber 21.

Further, the plurality of first vent holes 276 correspond to the first gaps between any two adjacent grid sheets one to one, two first vent holes 276 corresponding to two adjacent first gaps in the first arc-extinguishing chamber 21 are respectively located on two sides of the extending direction of the arc-blocking portion 274, and the projections of the two first vent holes 276 on the third insulating section 273 along the extending direction do not overlap. The extending direction of the arc blocking portion 274 is parallel to the grid lamination direction of the first arc extinguishing chamber 21.

With such an arrangement, the structural strength of the arc blocking portion 274 is increased on the premise of blocking the arc and ensuring the gas circulation.

In one embodiment, the shunt portion 275 is integrally formed with the first insulating section 271, and the arc stop portion 274 and the shunt portion 275 are integrally formed. Of course, the arc blocking portion 274 and the diverging portion 275 may be separately provided, and the present application is not limited thereto.

In one embodiment, the arc stop 274 is fixed to the bends of the second insulating segment 272 and the third insulating segment 273.

In one embodiment, the total area of the first vent holes 276 is 300mm ² . By such arrangement, normal gas discharge of the first arc extinguish chamber 21 can be ensured, and the structural strength of the arc blocking part 274 can be ensured.

In one embodiment, the first vent holes 276 at both ends of the arc blocking portion 274 in the extending direction have an area larger than that of the first vent hole 276 in the middle of the arc blocking portion 274. So set up, can guide the air current more smooth and easy at both ends run, and then lengthen electric arc, be convenient for by the cutting of first explosion chamber 21, improve the arc extinguishing effect.

Fig. 15 is a schematic view of a second insulating member of the arc extinguishing system shown in fig. 7.

Referring to fig. 15, in some embodiments, the arc extinguishing system further includes a second insulating member 28, the second insulating member 28 is located on a side of the second arc extinguishing chamber 22 opposite to the first arc extinguishing chamber 21 for preventing the second arc extinguishing chamber 22 from breaking back, and the second insulating member 28 has a plurality of second venting holes 281 adapted to the second arc extinguishing chamber 22, so that gas generated by the arc in the second arc extinguishing chamber 22 flows to the exhaust port through the second venting holes 281.

Through setting up second insulator 28, with the electric arc separation in second explosion chamber 22, thereby avoid the electric arc motion to the second explosion chamber 22 to deviate from the one side of first explosion chamber 21 and arouse the condition emergence of puncturing behind one's back, electric arc can be cut completely by second explosion chamber 22.

In one embodiment, the second insulator 28 is a plate-like structure that is disposed in close proximity to the second arc chute 22. The plurality of second ventilation holes 281 of the second insulating member 28 communicate with the second gap between any adjacent two of the grids in the second arc extinguishing chamber 22.

Further, the plurality of second ventilation holes 281 correspond to second gaps between any two adjacent grid plates of the second arc-extinguishing chamber 22 one by one, two second ventilation holes 281 corresponding to two adjacent second gaps in the second arc-extinguishing chamber 22 are respectively located at two sides of the extending direction of the second insulating member 28, and projections of the two second ventilation holes 281 on the third plane along the extending direction are not overlapped. Wherein the extending direction of the second insulating member 28 is parallel to the grid lamination direction of the second arc chute 22, and the third plane is perpendicular to the extending direction of the second insulating member 28.

With such an arrangement, the structural strength of the second insulating member 28 is increased on the premise of blocking the electric arc and ensuring the gas circulation.

In one embodiment, the total area of the second venting holes 281 is 600mm ² . So set up, can guarantee the gaseous normal discharge of second explosion chamber 22, can guarantee the structural strength of second insulator 28 again.

In one embodiment, the total area of the first venting holes 276 is less than the total area of the second venting holes 281. Further, the total area of the first vent holes 276 is one-half of the total area of the second vent holes 281. So set up for the area proportion of giving vent to anger of first explosion chamber 21 and second explosion chamber 22 reaches the best, and then the arc extinguishing effect reaches the best.

In one embodiment, the area of the second ventilation holes 281 at both ends of the second insulating member 28 in the extending direction is larger than the area of the second ventilation holes 281 in the middle of the second insulating member 28. So arranged, the gas flow can be guided to run more smoothly at both ends, and then the electric arc is elongated, so as to be conveniently cut by the second arc extinguishing chamber 22.

Referring to fig. 8 and 9, in one embodiment, the third arc separating section 293 extends from the second arc separating section 292 toward the third end 221 and the fourth end 222 of the second arc extinguishing chamber 22, so as to electrically isolate the second arc extinguishing chamber 22 from a portion of the first arc guiding member 23 and from the second arc extinguishing chamber 22 from a portion of the arc ignition device 3. Specifically, the third arc-isolating section 293 is disposed to electrically isolate the second arc-extinguishing chamber 22 from a portion of the first arc-guiding member 23 opposite to the second arc-extinguishing chamber 22 along the first direction X, such as the first connecting section 234, so as to prevent the arc from jumping to the grid of the second arc-extinguishing chamber 22 directly along the first direction X from the first connecting section 234. Similarly, the other portion of the third arc separating section 293 is arranged to electrically isolate the second arc-extinguishing chamber 22 from the portion of the first arc-striking member 31 opposite to the second arc-extinguishing chamber 22 along the first direction X, so as to prevent the arc from directly jumping to the grid of the second arc-extinguishing chamber 22 along the first direction X from the portion of the first arc-striking member 31 opposite to the second arc-extinguishing chamber 22 along the first direction X.

Further, the third arc separating segment 293 is of a fishtail structure, one of two parts of the fishtail structure protruding outwards is located between the second arc extinguish chamber 22 and the first arc guiding member 23, and the other part is located between the second arc extinguish chamber 22 and the arc striking device 3.

Fig. 16 is a schematic structural view of a first arc-extinguishing chamber and a second arc-extinguishing chamber in the arc-extinguishing system shown in fig. 7, and fig. 17 is a schematic structural view of a first grid of the first arc-extinguishing chamber shown in fig. 16.

Referring to fig. 16 and 17, in some embodiments, the first arc chute 21 includes a plurality of first grid pieces 213 stacked in layers, each first grid piece 213 includes a first body 214 and two first extending portions 215, each first extending portion 215 extends from the first body 214 to a side away from the second arc chute 22, and the two first extending portions 215 are disposed opposite to each other and cooperate with the two first arc-separating sections 291 to form a magnetic field for moving the arc toward the first arc chute 21.

It should be noted that the relative direction of the two first arc isolating sections 291 is the same as the relative direction of the two first extending sections 215, so that the first extending section 215 on one side of the first grid plates 213 is in inserting fit with the first arc isolating section 291 on the same side, and the first extending section 215 on the other side of the first grid plates 213 is in inserting fit with the first arc isolating section 291 on the same side.

The two first extending portions 215 can generate a magnetic field when the electric arc is generated, and the magnetic field has a magnetic blowing effect on the electric arc, so that the electric arc moves into the first arc extinguish chamber 21 through the narrow slit, the moving speed of the electric arc is increased by the arrangement of the first extending portions 215, and the arc extinguish time is shortened.

In one embodiment, the first extension 215 extends from the first body 214 along the second arc-extinguishing zone 12 in a direction towards the first arc-extinguishing zone 11, and the relative directions of the two first arc-separating segments 291 and the relative directions of the two first extensions 215 are both parallel to the second direction Y.

In one embodiment, the first body 214 and the first extension portion 215 are both plate-shaped structures, and the surfaces of the first body 214 and the first extension portion 215 are disposed parallel to the first direction X and also parallel to the second direction Y.

In one embodiment, a side of the first arc-isolating section 291 facing away from the second slit 294 is formed with a first receiving portion 295, and the first receiving portion 295 is used to receive the first extending portion 215.

It should be noted that the first body 214 of the first grid 213 plays an arc extinguishing role, and the first extension 215 only plays a magnetic blow role, so the area of the first body 214 is necessarily larger than the area of the first extension 215.

The first receiving portion 295 is formed at a side of the first arc isolating section 291, which faces away from the second narrow slit 294, and the two first extending portions 215 are still insulated by the blocking of the first arc isolating section 291, so that an arc does not jump into the first extending portions 215 during a movement process, but moves directly into the first body 214 of the first grid 213 according to the second narrow slit 294, and is cut by the first body 214 with a larger area.

In one embodiment, a side of the first body 214 near the first extension 215 is formed with a first groove 216 extending away from the first extension 215 and opposite to the second narrow slit 294. The presence of the first groove 216 facilitates lengthening of the arc, facilitating arc extinction.

Further, the first groove 216 is a chute. Two adjacent first grids 213 are arranged in an inverted manner. Therefore, the two inclined grooves with opposite inclination directions are alternately arranged, and the electric arc travels along with the inclined grooves and is further elongated, so that the arc extinction is facilitated.

Fig. 18 is a schematic structural view of a third grid of the second arc chute shown in fig. 16.

In some embodiments, the second arc chute 22 comprises a plurality of second grids 223 and third grids 224 arranged in a stacked manner, the plurality of second grids 223 is located in the middle of the second arc chute 22, the plurality of third grids 224 is located on both sides of the second grids 223, the second grids 223 comprise a second body 225 and two second extensions 226, the two second extensions 226 extend from the second body 225 toward the contact system 9, and the two second extensions 226 are oppositely arranged and respectively cooperate with the two arc separators 29 to form a magnetic field for moving the arc toward the second arc chute 22.

It should be noted that the relative direction of the two arc-isolating pieces 29 is the same as the relative direction of the two second extending portions 226, so that the second extending portion 226 on one side of the second grid pieces 223 is inserted and matched with the arc-isolating piece 29 on the same side, and the second extending portion 226 on the other side of the second grid pieces 223 is inserted and matched with the arc-isolating piece 29 on the same side.

Specifically, the grid of the second arc chute 22 is arranged in the order of the plurality of third grids 224, the plurality of second grids 223, and the plurality of third grids 224. The second grid 223 with the second extension 226 is centrally located to avoid the second extension 226 from interfering with any of the first arc guiding member 23, the first arc extinguishing chamber 21 and the arc ignition device 3.

The two second extending portions 226 can generate a magnetic field when an arc is generated, and the magnetic field forms a magnetic blowing effect on the arc, so that the arc moves into the second arc extinguish chamber 22 through the narrow slit, the moving speed of the arc is increased by the arrangement of the second extending portions 226, and the arc extinguish time is shortened.

In one embodiment, the second extension 226 extends from the second body 225 along the second arc-extinguishing zone 12 in a direction pointing to the first arc-extinguishing zone 11, and the opposite directions of the two second extensions 226 and the two arc dividers 29 are parallel to the second direction Y.

In one embodiment, the second body 225 and the second extension portion 226 are both plate-shaped structures, and the surfaces of the second body 225 and the second extension portion 226 are parallel to the first direction X and the second direction Y.

In one embodiment, the second extension 226 extends into the second and third arc splitter sections 292, 293, i.e., into the first extinguishing zone 11. The longer the length of the second extension 226, the stronger the resulting magnetic blow, and the faster the arc extinction. Further, the second arc-separating section 292 and the third arc-separating section 293 together form a second accommodating portion 296 for accommodating the second extending portion 226, and the second accommodating portion 296 is formed on a side of the second arc-separating section 292 and the third arc-separating section 293 facing away from the second narrow slit 294.

It should be noted that the second body 225 of the second grid 223 plays an arc extinguishing role, and the second extending portion 226 only plays a role of magnetic blow, so that the area of the second body 225 is necessarily larger than that of the second extending portion 226.

By forming the second receiving portion 296 on the side of the arc spacer 29 away from the second narrow slit 294, the two second extending portions 226 are still insulated from each other by the blocking of the second and third arc spacer sections 292 and 293, the arc does not jump into the second extension part 226 during the movement, but moves directly into the second body 225 of the second barrier 223 according to the second narrow slit 294, and is cut by the second body 225 having a larger area.

In one embodiment, a side of the second body 225 adjacent to the second extension portion 226 is formed with a second groove extending in a direction away from the second extension portion 226 and opposite to the second narrow slit 294. The existence of the second groove is favorable for lengthening the electric arc, and arc extinction is facilitated.

Further, the second groove is a chute. Two adjacent second gates 223 are arranged upside down. Therefore, the two inclined grooves with opposite inclination directions are alternately arranged, and the electric arc travels along with the inclined grooves, so that the arc extinguishing is facilitated.

In one embodiment, a third groove 227 is formed on a side of the third grid 224 close to the first arc-extinguishing region 11, and the third groove 227 is opposite to the second narrow slit 294. The presence of the third recess 227 facilitates lengthening of the arc, facilitating arc extinction.

Further, the third groove 227 is a chute. Two adjacent third grids 224 are arranged in an inverted manner. Therefore, the two inclined grooves with opposite inclination directions are alternately arranged, and the electric arc travels along with the inclined grooves and is further lengthened, so that arc extinction is facilitated.

In some embodiments, the arc ignition device 3 comprises a first arc ignition member 31 and a second arc ignition member 32, wherein one end of the first arc ignition member 31 is connected to the first contact 91, the other end of the first arc ignition member 31 is stacked with the fourth end 222 of the second arc extinguishing chamber 22, one end of the second arc ignition member 32 is electrically connectable with the second contact 92, and the other end of the second arc ignition member 32 is stacked with the first end 211 of the first arc extinguishing chamber 21.

It should be noted that the second arc ignition member 32 can be electrically connected to the second contact 92, which means that the second contact 92 is electrically connected to the second arc ignition member 32 by an arc after rotating to the maximum angle.

The first arc striking member 31 is connected to the first contact 91 and is stacked on the fourth end 222 of the second arc extinguishing chamber 22, so that an arc can be introduced into the second arc extinguishing chamber 22 for arc extinguishing in an arc extinguishing stage. The first arc striking member 31 and the fourth end 222 of the second arc extinguishing chamber 22 are stacked, i.e. spaced, so that the arc voltage drop of the arc burning in the second arc extinguishing chamber 22 is improved, and arc extinguishing is facilitated. Similarly, the second contact 92 is electrically connected to the second arc striking member 32 after rotating, the second contact 92 introduces the arc into the first arc extinguishing chamber 21 to extinguish the arc, and the second arc striking member 32 is stacked with the first end 211 of the first arc extinguishing chamber 21, so that the arc voltage drop of the arc burning in the first arc extinguishing chamber 21 is increased, and arc extinguishing is facilitated.

In one embodiment, one end of the first arc ignition member 31 is threadedly connected to the first contact 91. Of course, welding and the like may also be used, and the present application is not limited thereto.

In some embodiments, the first connection portion 314 extends from the second arc ignition portion 315 to the first arc ignition portion 313 in a direction away from the second arc extinguishing chamber 22. In this way, the second arc striking portion 315 and the second arc extinguishing chamber 22 are stacked, and the first connecting portion 314 extends in a direction away from the fourth end 222 of the second arc extinguishing chamber 22 and close to the second grid 223, so that a receiving space is formed between the first connecting portion 314 and the second arc extinguishing chamber 22, and a portion of the third arc separating segment 293 is located in the receiving space, so as to insulate the first connecting portion 314 and the third grid 224 from each other.

It should be noted that although the two third arc separating segments 293 have the second narrow slits 294 therebetween, the third grooves 227 are located in the third barrier 224 corresponding to the second narrow slits 294, and the third grooves 227 enable the third barrier 224 to be located at a longer distance from the first connecting portion 314, so as to prevent the arc root of the arc from jumping directly from the first connecting portion 314 to the third barrier 224 located above the fourth end 222. Similarly, the second arc extinguishing chamber 22 is also electrically isolated from the first arc guiding member 23, and the other portion of the third arc isolating section 293 is disposed to substantially electrically isolate the second arc extinguishing chamber 22 from the first connecting section 234.

In one embodiment, the third grating 224 is 3-5mm away from the first connection portion 314. Within this distance range, the arc can more easily enter the second arc chute 22 from the first arc ignition member 31 for arc extinction, and a direct jumping of the arc from the first connection portion 314 to the third grid 224 hardly occurs.

In one embodiment, the third grid 224 is spaced 3-5mm from the first connecting segment 234. Within this distance range, the arc can more easily enter the second arc chute 22 from the first arc guiding piece 23 for arc extinction, and a direct jumping of the arc from the first connecting section 234 to the third grid 224 hardly occurs.

It should be noted that, in the present application, the first arc striking component 31 may not be provided, and the shape of the second arc extinguishing chamber 22 is set so that the fourth end 222 of the second arc extinguishing chamber 22 is closer to the first contact 91, and then, in the arc extinguishing stage, the arc breaks through the air between the two to electrically connect the two.

Referring to fig. 7, in one embodiment, the second arc striking member 32 includes a potential jump piece, the potential jump piece includes a jump portion 323 and a first guide portion 324, when the second contact 92 rotates to a maximum angle, the jump portion 323 has an interval with the second contact 92, the jump portion 323 is used for introducing the arc of the second contact 92 into itself, and the first guide portion 324 is stacked with the first end 211 of the first arc extinguishing chamber 21 to introduce the arc into the first arc extinguishing chamber 21.

In another embodiment, the second arc ignition member 32 includes a second guide portion that contacts the second contact 92 to introduce the arc of the second contact 92 into itself when the second contact 92 is rotated to a maximum angle, and a third guide portion that is stacked with the first end 211 of the first arc extinguishing chamber 21 to introduce the arc into the first arc extinguishing chamber 21.

It should be noted that, in the present application, the second arc striking component 32 may not be provided, and the first end 211 of the first arc extinguishing chamber 21 is arranged to be closer to the second contact 92 by setting the shape of the first arc extinguishing chamber 21, so that the arc breaks through the air between the two to electrically connect the two in the arc extinguishing stage.

Fig. 19 is an assembled schematic view of the arc extinguishing system shown in fig. 7.

Referring to fig. 19, in some embodiments, the housing 1 includes a first side plate 131 and a second side plate 132, and the first side plate 131 and the second side plate 132 are oppositely disposed to form an accommodating cavity. The first side plate 131 and the second side plate 132 are respectively provided with a plurality of mounting holes 133 for mounting the first arc-extinguishing chamber 21, the second arc-extinguishing chamber 22, the first arc-guiding member 23, the arc-isolating member 29 and the second insulating member 28.

In one embodiment, the first side plate 131 and the second side plate 132 are oppositely disposed along a second direction Y, which is perpendicular to the first direction X. Further, the two arc separators 29 are disposed oppositely along the second direction Y, the two first extending portions 215 are disposed oppositely along the second direction Y, and the two second extending portions 226 are disposed oppositely along the second direction Y.

In other embodiments, the second arc extinguishing chamber 22 exceeds the first arc extinguishing chamber 21 in a direction in which the first contact 91 points towards said second contact 92.

Further, the first arc chute 21 extends beyond the second arc chute 22 in a direction in which the second contact 92 points towards the first contact 91.

While the present application has been described with reference to preferred embodiments, 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, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (11)

1. A circuit breaker, comprising:

the contact system comprises a first contact and a second contact, the second contact can rotate relative to the first contact to switch on or off a circuit, and when the circuit is switched off, an arc is generated between the second contact and the first contact;

a wiring device including a first terminal for connecting an external circuit, a second terminal, and an electrical connector, the first terminal being connected to the first contact through the electrical connector;

an arc extinguishing system comprising an arc extinguishing device, an arc striking device and an insulating member, the arc extinguishing device and the arc striking device being electrically connectable, the arc striking device comprising a first arc striking member connected with the first contact and disposed opposite to a portion of the electrical connection member, and a second arc striking member electrically connectable with the second contact to introduce the arc into the arc extinguishing device,

the insulating piece comprises a shell body and a separation part, and the shell body wraps part of the first arc striking piece and part of the electric connecting piece so that electric arcs enter the arc extinguishing device along the first arc striking piece; the isolation portion is capable of electrically isolating the first arc ignition piece and a portion of the electrical connection member opposite to the first arc ignition piece.

2. The circuit breaker according to claim 1, wherein the first arc striking member comprises a first arc striking portion, a first connecting portion and a second arc striking portion which are connected in sequence, the first arc striking portion is connected with the first contact, and the second arc striking portion is stacked with the arc extinguishing device;

the electric connecting piece comprises a first connecting end, a second connecting part and a second connecting end which are connected in sequence, the first connecting end is connected with the first contact, and the second connecting end is connected with the first wiring end;

an accommodating channel is formed between the shell body and the isolating part, and is used for accommodating part of the first arc striking piece and part of the electric connecting piece and sequentially extends along the direction of the first connecting part, the first arc striking part, the first connecting end and the second connecting part so as to realize the electrical isolation between the second connecting part and the first arc striking piece.

3. The circuit breaker according to claim 2, wherein the second connecting portion comprises a first sub-segment, a second sub-segment and a third sub-segment which are sequentially connected in a bent manner, the first sub-segment is connected with the first connecting end in a bent manner, the third sub-segment is connected with the second connecting end in a bent manner, and the first sub-segment and the third sub-segment are oppositely arranged along the direction of the first contact and the first terminal;

the isolation part extends to the bent part of the third subsection and the second connecting end.

4. The circuit breaker of claim 2,

the shell body is provided with a first narrow slit which extends along the trend of the first arc-striking part and the first connecting part, so that one side of the first arc-striking part facing the arc-extinguishing device is exposed from the first narrow slit.

5. The circuit breaker of claim 4, wherein the arc quenching system comprises a housing having a receiving cavity, the receiving cavity comprising a first arc quenching zone and a second arc quenching zone arranged along a first direction, the first contact and the second contact being located at a side of the receiving cavity where the first arc quenching zone is far away from the second arc quenching zone;

the arc extinguishing device comprises a first arc extinguishing chamber, a second arc extinguishing chamber and a first arc guiding piece, wherein at least part of the first arc extinguishing chamber is positioned in the first arc extinguishing zone, at least part of the second arc extinguishing chamber is positioned in the second arc extinguishing zone, and the first arc extinguishing chamber and the second arc extinguishing chamber are overlapped in projection on the shell along the first direction and can be electrically connected through the first arc guiding piece; the arc striking device is used for introducing the electric arc into the first arc extinguishing chamber and the second arc extinguishing chamber;

the second arc ignition part and the second arc extinguish chamber are arranged in a stacked mode, and the first narrow gap is at least partially located in the first arc extinguish region so that an arc root of the first contact is led into the second arc ignition part along the first narrow gap.

6. The circuit breaker of claim 5,

the arc extinguishing system further comprises two arc isolating pieces which are oppositely arranged, each arc isolating piece comprises a first arc isolating section, a second arc isolating section and a third arc isolating section which are sequentially connected, the first arc isolating section is positioned on one side, deviating from the second arc extinguishing chamber, of the first arc extinguishing chamber, the second arc isolating section is positioned on one side, close to the insulating piece, of the first arc extinguishing chamber, the third arc isolating section is positioned on one side, close to the first arc extinguishing chamber, of the second arc extinguishing chamber, one part of the third arc isolating section is clamped between the first arc conducting piece and the second arc extinguishing chamber, so that the second arc extinguishing chamber and the first arc extinguishing chamber are electrically isolated from each other,

a second narrow slit is formed between the two arc isolating pieces, and the first narrow slit is aligned with the corresponding parts of the second arc isolating section and the third arc isolating section in the second narrow slit, so that the electric arc moves into the first arc extinguish chamber and the second arc extinguish chamber along the first narrow slit and the second narrow slit.

7. The circuit breaker of claim 4, wherein the housing body forms a preformed hole for exposing the first contact, the preformed hole communicating with the first slot.

8. The circuit breaker of claim 4, wherein the insulator includes a first mounting portion and a second mounting portion, the first mounting portion and the second mounting portion being aligned and detachably connected in a second direction, wherein the second direction is perpendicular to an alignment direction of the first arc striking portion and the second arc striking portion,

wherein the first mounting portion and the second mounting portion together form the isolation portion and the first slit.

9. The circuit breaker of claim 8, wherein the first mounting portion includes a first clamping member, the second mounting portion includes a second clamping member, the first mounting portion and the second mounting portion pass through the first clamping member and the second clamping member are clamped and matched.

10. The circuit breaker of claim 8, wherein a first step surface is formed on a side of the first mounting portion facing the second mounting portion, a second step surface is formed on a side of the second mounting portion facing the first mounting portion, and the first step surface and the second step surface are engaged with each other.

11. The circuit breaker according to claim 2, wherein the isolation portion comprises a closed ring structure and an extension portion, the closed ring structure is matched with a cavity formed by the first connection portion, the first arc striking portion and a part of the second connection portion in an enclosing manner, and the extension portion extends from the closed ring structure to the second connection end along the direction of the second connection portion.

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