CN210925931U - Arc extinguishing chamber and circuit breaker - Google Patents

Abstract

The utility model provides an explosion chamber and circuit breaker, fit the lid on base and the well seat including the base and locating well seat on the base and lid, the setting of arc-extinguishing piece perpendicular to base, and have the arc extinguishing clearance between the adjacent arc-extinguishing piece, the one end of well seat keeping away from the magnetic support is equipped with the fender arc muscle group that is used for shutoff arc extinguishing clearance, and upper strata fender arc muscle and lower floor keep off the arc muscle and shelter from the upper portion and the lower part in two adjacent arc extinguishing clearances respectively. Electric arc can form the arc extinguishing passageway through the arc extinguishing clearance, and the tail end of arc extinguishing piece is not the shutoff completely, it blocks off the arc muscle through the upper strata that interlocks each other and lower floor and blocks off the arc muscle and carry out the shutoff to the tail end of arc extinguishing piece respectively, only upper portion shutoff or lower part shutoff in arc extinguishing clearance promptly, can form the passageway of ventilating of intercommunication to the guide of arc extinguishing air current, thereby accelerate gaseous flow, make electric arc remove in moving to the arc extinguishing chamber and towards the afterbody of arc extinguishing chamber from the magnetic support easily, reduce the extinguishing time of electric arc.

Description

Arc extinguishing chamber and circuit breaker

Technical Field

The utility model relates to a technical field of circuit breaker structure, concretely relates to explosion chamber and circuit breaker.

Background

For the circuit breaker in the prior art, an arc extinguishing chamber is generally required to be arranged for arc extinguishing, wherein the arc extinguishing chamber generally adopts a traditional metal grid arc extinguishing chamber, and an arc extinguishing sheet on the upper part of the arc extinguishing chamber and the periphery of the arc extinguishing chamber adopt a melamine laminated board. When an arc is generated, the melamine laminate is heated to release a gas which helps to extinguish the arc. The arc extinguishing piece laminated board on the upper part of the arc extinguishing chamber is punched with a plurality of holes with equal size, and airflow and heat are released through the holes, so that the aim of arc extinguishing is fulfilled.

However, the arc extinguishing passageway in current explosion chamber generally is located the afterbody of explosion chamber, no matter the size in the outside buffer zone space of explosion chamber this moment, it generally only shelters from through the splint of bellied rib and explosion chamber outer fringe on the shell, and the distance between the splint of bellied rib and explosion chamber outer fringe and the arc extinguishing piece is unequal on the shell, the spatial distribution who leads to the buffer is inhomogeneous, and there is the problem that airflow channel is not smooth and easy in the buffer zone of subregion, if shelter from the afterbody of explosion chamber completely, can lead to electric arc to be difficult for getting into the explosion chamber, the utilization efficiency of explosion chamber is lower, the phenomenon of puncturing behind one's back can also appear in the electric arc that gets into the explosion chamber, thereby reduce the performance of breaking of circuit breaker.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an explosion chamber to solve the technical problem who exists among the prior art.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides an arc extinguish chamber, include the base and locate well seat and lid on the base fit the base with lid on the well seat, set up the chamber that holds that is used for holding a plurality of arc extinguishing pieces in the well seat, the arc extinguishing piece perpendicular to the base sets up, and is adjacent have the arc extinguishing clearance between the arc extinguishing piece, magnetism support extensible extremely on the arc extinguishing piece, well seat is keeping away from the one end of magnetism support is equipped with and is used for the shutoff the arc extinguishing clearance keep off the arc muscle group, keep off the arc muscle group including the upper strata that sets up that interlocks each other and keep off the arc muscle and lower floor and keep off the arc muscle, the upper strata keep off the arc muscle with the lower floor keeps off the arc muscle and shelters from adjacent two respectively the upper portion and the lower part in arc extinguishing clearance.

Furthermore, a partition plate is transversely arranged on the middle seat, the partition plate is parallel to the base, an upper buffer wall is convexly arranged on the outer edge of the partition plate towards the cover body, an upper buffer area is formed by enclosing the partition plate, the cover body and the upper buffer wall, and the upper part of the arc extinguishing gap can be communicated with the upper buffer area;

a lower buffer wall is convexly arranged on one side, facing the base, of the outer edge of the partition plate, a lower buffer area is formed among the partition plate, the base and the lower buffer wall, and the lower part of the arc extinguishing gap can be communicated with the lower buffer area;

the lower arc blocking rib close to one side of the magnetic support is provided with a notch, and the lower part of the arc extinguishing gap close to one side of the magnetic support is not blocked.

Furthermore, a first air outlet is formed in one side, far away from the magnetic support, of the upper buffer area, and a second air outlet is formed in one side, far away from the magnetic support, of the lower buffer area.

Furthermore, the upper-layer arc blocking rib is convexly arranged on one side of the partition plate, which is far away from the base, and comprises a plurality of upper-layer stop blocks arranged at intervals, and each upper-layer stop block corresponds to the upper part of one arc extinguishing gap; the lower layer arc blocking rib is convexly arranged on one side, close to the base, of the partition plate and comprises a plurality of lower layer stop blocks arranged at intervals, and each lower layer stop block corresponds to the lower part of one arc extinguishing gap; the upper layer stop blocks and the lower layer stop blocks are arranged in a staggered mode.

Furthermore, a corner plate is arranged on one side of the upper layer stop block, which is positioned at one end far away from the magnetic support, and blocks the arc extinguishing gap at one end far away from the magnetic support.

Furthermore, an air outlet channel is arranged between the arc extinguishing sheet which is positioned on one side closest to the magnetic support and the edge of the middle seat, and a third air outlet which is connected with the air outlet channel and the upper buffer area and a fourth air outlet which is connected with the air outlet channel and the lower buffer area are arranged on the middle seat.

Further, the cross-sectional area of the third air outlet is larger than the cross-sectional area of the fourth air outlet.

Furthermore, an extension wall surrounding the outer edge of the air outlet channel extends from one side of the upper buffer wall facing the air outlet channel.

Furthermore, a fifth air outlet is formed in one side of the middle seat, which is used for fixing the fixing column of the magnetic support.

The utility model also provides a circuit breaker, including the magnetism support with as above the explosion chamber, magnetism support extensible extremely on the explosion chamber, just be equipped with the static contact on the magnetism support.

The utility model provides an explosion chamber and circuit breaker's beneficial effect lies in: compared with the prior art, the utility model discloses explosion chamber and circuit breaker, the center frame is established in the base, and the arc extinguishing piece sets up the intracavity that holds of center, thereby position through the outer fringe of center is injectd the arc extinguishing piece, electric arc can form the arc extinguishing passageway through the arc extinguishing clearance, and the tail end of arc extinguishing piece is not totally the shutoff, it blocks off the tail end of arc extinguishing piece respectively through the upper strata arc blocking muscle that interlocks each other and lower floor arc blocking muscle, only upper segment shutoff or lower part shutoff in arc extinguishing clearance promptly, can form the passageway of ventilating of intercommunication to the guide of arc extinguishing air current, realize the intercommunication with clearance and outside between the arc extinguishing piece, thereby accelerate gaseous flow, make electric arc remove to the afterbody of explosion chamber in and towards the explosion chamber from the magnetic support easily, reduce the extinguishing time of electric arc.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic front view of an arc extinguish chamber according to an embodiment of the present invention, wherein a cover is not shown;

fig. 2 is a schematic top view of an arc extinguish chamber according to an embodiment of the present invention, wherein a cover is not shown;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a sectional view taken along line B-B of FIG. 2;

fig. 5 is a schematic perspective view of an arc extinguish chamber according to an embodiment of the present invention, wherein a cover is not shown;

fig. 6 is a schematic perspective view of a second arc extinguish chamber according to an embodiment of the present invention, wherein a cover is not shown;

fig. 7 is a partially enlarged structural view of a portion C in fig. 6;

fig. 8 is a schematic rear view of the arc extinguish chamber according to the embodiment of the present invention, wherein the base is not shown.

Description of reference numerals:

1. a base; 2. a middle seat; 3. a cover body; 4. an arc extinguishing sheet; 5. a magnetic support; 21. an accommodating chamber; 22. an arc blocking rib group; 23. a partition plate; 24. an upper buffer area; 25. a lower buffer area; 26. an air outlet channel; 27. a third air outlet; 28. a fourth air outlet; 29. a fifth air outlet; 221. an upper layer of arc blocking ribs; 222. the lower layer of arc blocking ribs; 231. an upper buffer wall; 232. a lower bumper wall; 233. a first air outlet; 234. a second air outlet; 235. an extension wall; 31. a corner plate; 41. an arc extinguishing gap; 51. and (7) carrying out static contact.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 to 4 together, the arc extinguishing chamber provided by the present invention will now be described. Arc extinguishing chamber, include base 1 and locate well seat 2 and lid on the base 1 fit base 1 with lid 3 on the well seat 2, it is used for holding chamber 21 that holds of a plurality of arc extinguishing pieces 4 to have seted up in well seat 2, arc extinguishing piece 4 perpendicular to base 1 sets up, and is adjacent arc extinguishing gap 41 has between the arc extinguishing piece 4, and magnetic support 5 extendible extremely on the arc extinguishing piece 4, well seat 2 is keeping away from the one end of magnetic support 5 is equipped with and is used for the shutoff arc extinguishing gap 41 keeps off arc muscle group 22, it keeps off arc muscle group 22 including the last layer that interlocks the setting each other and keeps off arc muscle 221 and lower floor and keeps off arc muscle 222, the last layer keep off arc muscle 221 with lower floor keeps off arc muscle 222 and shelters from adjacent two respectively the upper portion and the lower part of arc extinguishing gap 41.

The utility model provides an arc extinguishing chamber, compared with the prior art, 2 frames of well seat are established in base 1, and arc extinguishing piece 4 sets up in the chamber 21 that holds of well seat 2, thereby the position of arc extinguishing piece 4 is injectd through the outer fringe of well seat 2, electric arc can form the arc extinguishing passageway through arc extinguishing clearance 41, and the tail end of arc extinguishing piece 4 is not totally shutoff, it blocks up the tail end of arc extinguishing piece 4 respectively through crisscross upper strata arc blocking muscle 221 and lower floor arc blocking muscle 222, only upper segment shutoff or lower part shutoff of arc extinguishing clearance 41 promptly, can form the passageway of ventilating of intercommunication to the arc extinguishing air current guide, the intercommunication is realized with clearance and outside between the arc extinguishing piece 4, thereby accelerate gaseous flow, make electric arc remove to the afterbody of arc extinguishing chamber in the arc extinguishing chamber and towards the arc extinguishing chamber from magnetic bracket 5 easily, reduce the time of extinguishing of electric arc.

Specifically, the base 1 and the cover 3 are standard components of a circuit breaker, an operating mechanism (not shown), a static contact 51, an electromagnetic coil and the like are further arranged between the base 1 and the cover 3, the magnetic support 5 is an arc striking plate and can guide an electric arc to between the arc extinguishing plates 4, and one side of the static contact 51 fixed on the arc striking plate can be in contact with a movable contact (not shown). Well seat 2 sets up on base 1, and the mid portion of well seat 2 has a through-hole, and the outer wall of this through-hole, base 1 and lid 3 enclose jointly and are one and hold chamber 21, and arc extinguishing piece 4 is vertical to be arranged in should holding chamber 21, and the quantity of arc extinguishing piece 4 is a plurality of, and even interval means in proper order should holding chamber 21, can form arc extinguishing clearance 41 between the adjacent arc extinguishing piece 4, and arc extinguishing gas can enter into the buffer zone of well seat 2 outer fringe through arc extinguishing clearance 41. Wherein, in order to make the setting of perpendicular base 1 that arc-extinguishing piece 4 can be stable, the one end of keeping away from base 1 at arc-extinguishing piece 4 is provided with a connection piece, and two adjacent arc-extinguishing pieces 4 can be connected to this connection piece, can fix the interval between arc-extinguishing piece 4, also can prescribe a limit to the position of arc-extinguishing piece 4.

Further, please refer to fig. 1 to 5 together, as a specific embodiment of the arc extinguishing chamber of the present invention, a partition plate 23 is transversely disposed on the middle base 2, the partition plate 23 is disposed parallel to the base 1, an upper buffer wall 231 is disposed on an outer edge of the partition plate 23 facing the cover 3 in a protruding manner, an upper buffer area 24 is defined between the partition plate 23, the cover 3 and the upper buffer wall 231, and an upper portion of the arc extinguishing gap 41 can be communicated with the upper buffer area 24; a lower buffer wall 232 is convexly arranged on one side of the outer edge of the partition plate 23 facing the base 1, a lower buffer area 25 is formed among the partition plate 23, the base 1 and the lower buffer wall 232, and the lower part of the arc extinguishing gap 41 can be communicated with the lower buffer area 25; the lower arc-stopping rib 222 near one side of the magnetic bracket 5 has a notch (not shown), and the lower portion of the arc-extinguishing gap 41 near one side of the magnetic bracket 5 is not blocked. Specifically, the partition plate 23 is disposed in the middle of the middle seat 2, and divides the buffer area into the upper buffer area 24 and the lower buffer area 25, the arc extinguishing gap 41 without the upper arc blocking rib 221 can be communicated with the upper buffer area 24, the arc extinguishing gap 41 with the lower arc blocking rib 222 can be communicated with the lower buffer area 25, and the arc extinguishing gas in the arc extinguishing gap 41 are respectively guided to the inside of the upper buffer area 24 and the lower buffer area 25. In general, the space of the upper buffer area 24 is smaller than the space of the lower buffer area 25, and therefore, more arcs and arc-extinguishing gases need to be guided into the lower buffer area 25, and therefore, an unblocked gap is provided on the lower buffer area 25, at this time, a plurality of arc-extinguishing gaps 41 located at the outermost edge can be all communicated with the lower buffer area 25, preferably, 3 to 4 arc-extinguishing gaps 41 located at a side close to the magnetic bracket 5 can be all directly communicated with the lower buffer area 25, and only half of the arc-extinguishing gaps 41 can be communicated with the upper buffer area 24.

Further, referring to fig. 1 to 5, as a specific embodiment of the arc extinguish chamber provided in the present invention, the upper buffer area 24 has a first air outlet 233 at a side away from the magnetic bracket 5, and the lower buffer area 25 has a second air outlet 234 at a side away from the magnetic bracket 5. Specifically, first gas outlet 233 and second gas outlet 234 set up respectively in last buffer 24 and the one end of buffer 25 keeping away from magnetic bracket 5 down, keep away from other components and parts in the circuit breaker promptly, and first gas outlet 233 and second gas outlet 234 are generally linked together with the circuit breaker outside, can avoid the gaseous and electric arc of exhaust arc extinguishing to influence the normal work of other components this moment.

In order to facilitate the installation of other components in the circuit breaker, therefore, the upper buffer wall 231 and the lower buffer wall 232 are both obliquely arranged, the upper buffer wall 231 is convexly arranged on one side of the partition plate 23 away from the base 1, and the upper buffer wall 231 is located at the tail end of the arc extinguish chamber, so as to seal the upper buffer area 24 at the tail end of the arc extinguish chamber, the upper buffer wall 231 obliquely extends from one side close to the magnetic bracket 5 to one side away from the magnetic bracket 5, and at the moment, the upper buffer wall 231 can also play a role in guiding the gas to flow. Lower buffer wall 232 protrusion sets up in the one side that is close to base 1 of baffle 23, and can support baffle 23, and lower buffer wall 232 also is located the tail end of explosion chamber to seal the lower buffer 25 of explosion chamber tail end, lower buffer wall 232 extends by the one side slope of keeping away from magnetic bracket 5 of one side orientation that is close to magnetic bracket 5, and buffer wall 232 can also play the effect of guide gas flow direction this moment.

Further, referring to fig. 1 to 5, as a specific embodiment of the arc extinguishing chamber provided by the present invention, the upper arc blocking rib 221 is convexly disposed on one side of the partition plate 23 away from the base 1, the upper arc blocking rib 221 includes a plurality of upper stoppers arranged at intervals, and each upper stopper corresponds to an upper portion of the arc extinguishing gap 41; the lower arc-blocking rib 222 is convexly arranged on one side of the partition plate 23 close to the base 1, the lower arc-blocking rib 222 comprises a plurality of lower stoppers arranged at intervals, and each lower stopper corresponds to the lower part of one arc-extinguishing gap 41; the upper layer stop blocks and the lower layer stop blocks are arranged in a staggered mode. Specifically, the upper-layer arc blocking ribs 221 are a plurality of upper-layer blocking blocks convexly arranged on the partition plate 23, and the upper-layer blocking blocks uniformly block the upper part of the arc extinguishing gap 41 at intervals; the lower arc blocking ribs 222 are a plurality of lower blocking blocks protruding from the partition 23, the lower blocking blocks are uniformly spaced to block the upper portion of the arc extinguishing gap 41, and a gap is formed by the lower blocking blocks not arranged on one side close to the magnetic support 5. The upper layer of blocks and the lower layer of blocks are staggered, namely, the upper part of each arc extinguishing gap 41 is partially blocked by the upper layer of blocks or the lower layer of blocks. Of course, according to actual conditions and specific requirements, in the utility model discloses an in other embodiments, upper strata keeps off arc muscle 221 and lower floor and keeps off arc muscle 222 and can also be a confined plate body, and has seted up intercommunicating pore and lower intercommunicating pore respectively in the punishment that corresponds arc extinguishing clearance 41, goes up the intercommunicating pore and sets up for crisscross with lower intercommunicating pore, does not do only limit here.

Further, please refer to fig. 8, as a specific embodiment of the arc extinguish chamber provided by the present invention, a corner plate 31 is disposed on one side of the upper layer stopper away from one end of the magnetic bracket 5, and the corner plate 31 blocks the arc extinguish gap 41 away from the end of the magnetic bracket 5. Specifically, be located the arc extinguishing clearance 41 of keeping away from one side of magnetic bracket 5 the most, this arc extinguishing clearance 41 can switch on with lower buffer 25 mutually, and upper layer dog does not carry out the shutoff with this arc extinguishing clearance 41, carry out the shutoff with this arc extinguishing clearance 41 through this turning plate 31, can combine together with lower floor's dog and seal the arc extinguishing clearance 41 of keeping away from one side of magnetic bracket 5 the most greatly, guarantee that the explosion chamber keeps away from the atmospheric pressure of the part of magnetic bracket 5 and can not discharge fast, guaranteed to supply electric arc quick travel by sufficient atmospheric pressure in the explosion chamber.

Preferably, the corner plate 31 is an obliquely disposed strip protruding from the lower surface of the cover 3, one end of the strip is directly sealed at the upper portion of the arc extinguishing gap 41, and the other end of the strip is obliquely disposed toward the first air outlet 233, and at this time, the corner plate 31 can be combined with the upper buffer wall 231 to guide the air flow together, so as to ensure that the arc extinguishing gas in the upper buffer 24 can be discharged from the first air outlet 233.

Further, please refer to fig. 6 and 7, as a specific embodiment of the arc extinguishing chamber provided by the present invention, an air outlet channel 26 is provided between the arc extinguishing plate 4 located at a side closest to the magnetic bracket 5 and the edge of the middle seat 2, and a third air outlet 27 connected to the air outlet channel 26 and the upper buffer area 24 and a fourth air outlet 28 connected to the air outlet channel 26 and the lower buffer area 25 are provided on the middle seat 2. Specifically, after a plurality of arc extinguishing pieces 4 are arranged in the middle seat 2, a gap is formed between the arc extinguishing pieces 4 positioned on the outer edges of the two sides and the middle seat 2, the gap is an air outlet channel 26, wherein the air outlet channel 26 close to one side of the magnetic support 5 can be communicated with the upper buffer area 24 and the lower buffer area 25, the arc striking plates of the magnetic support 5 can lead electric arcs into the air outlet channel 26, the electric arcs can be accelerated to rapidly enter the arc extinguishing chamber, the arc striking roots are made to jump to the magnetic support 5 from the arc striking angles on the magnetic support 5 easily, the electric arcs move to the tail of the arc extinguishing chamber rapidly, and the extinguishing time of the electric arcs is shortened.

Further, please refer to fig. 7, as a specific embodiment of the arc extinguish chamber provided in the present invention, the cross-sectional area of the third air outlet 27 is larger than the cross-sectional area of the fourth air outlet 28. Specifically, the upper end of the arc extinguishing gap 41 closest to the air outlet channel 26 is blocked by an upper layer block, the lower end of the arc extinguishing gap is not blocked, a third air outlet 27 is formed on one side of the outermost arc extinguishing piece 4 of the middle seat 2, the third air outlet 27 is directly formed on the side wall of the middle seat 2 and is communicated with the upper buffer zone 24, a smaller fourth air outlet 28 is formed on one side of the lower-end-unclosed arc extinguishing gap 41 of the middle seat 2, the fourth air outlet 28 can be communicated with the outermost arc extinguishing gap 41 and flows into the lower buffer zone 25, and the space of the lower buffer zone 25 is larger than that of the upper buffer zone 24, so that more arc extinguishing gas can flow into the lower buffer zone 25, the flow of gas in the arc extinguishing chamber is accelerated, and the arc extinguishing time is shortened.

Further, referring to fig. 6 and 7, as a specific embodiment of the arc extinguish chamber provided in the present invention, the upper buffer wall 231 is extended at a side facing the gas outlet channel 26 to form an extended wall 235 enclosing the outer edge of the gas outlet channel 26. Specifically, the upper buffer wall 231 is arranged at the tail of the arc extinguish chamber, and the upper buffer wall 231 is used for enclosing to form the upper buffer area 24, so as to avoid that the arc extinguish gas and the electric arc entering the upper buffer area 24 affect other components, the buffer wall is extended to form the extension wall 235, wherein the extension wall 235 extends from the end part of the buffer wall to one side of the magnetic bracket 5, and the extension length can be adjusted according to the specific structure and layout of the circuit breaker.

Further, please refer to fig. 1, as a specific embodiment of the arc extinguish chamber provided by the present invention, a fifth air outlet 29 is further formed at one side of the fixing column for fixing the magnetic bracket 5 of the middle seat 2. Specifically, the fifth air outlet 29 is disposed at an end of the arc extinguishing chamber and located at one side of the magnetic support 5, and at this time, the fifth air outlet 29 can be communicated with the third air outlet 27 and the fourth air outlet 28, so that air flow circulation is formed in the area of the static contact 51, the flow speed of the arc extinguishing gas is accelerated, and the time required for arc extinguishing is reduced.

Referring to fig. 1 to 8, the present invention further provides a circuit breaker, which includes a magnetic bracket 5 and the arc extinguish chamber, wherein the magnetic bracket 5 is extendable to the arc extinguish chamber, and the magnetic bracket 5 is provided with a static contact 51.

The utility model provides a circuit breaker, 2 frames of well seat are established in base 1, and arc extinguishing piece 4 sets up in the chamber 21 that holds of well seat 2, thereby position through well seat 2 is injectd arc extinguishing piece 4 to the outer fringe, electric arc can form the arc extinguishing passageway through arc extinguishing clearance 41, and the tail end of arc extinguishing piece 4 is not totally blocked, it keeps off arc rib 221 and lower floor through the upper strata that interlocks and keeps off arc rib 222 and carries out the shutoff respectively to the tail end of arc extinguishing piece 4, only upper portion shutoff or lower part shutoff of arc extinguishing clearance 41 promptly, can form the passageway of ventilating of intercommunication to the arc extinguishing air current guide, clearance and outside realization intercommunication between the arc extinguishing piece 4, thereby accelerate gaseous flow, make electric arc remove to indoor and towards the afterbody removal of explosion chamber from magnetic bracket 5 easily, reduce the arc extinguishing time of arc.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. Arc extinguishing chamber, include base (1) and locate well seat (2) and the lid on base (1) fit base (1) with lid (3) on well seat (2), set up chamber (21) that holds that is used for holding a plurality of arc extinguishing pieces (4) in well seat (2), arc extinguishing piece (4) perpendicular to base (1) sets up, and adjacent have arc extinguishing clearance (41) between arc extinguishing piece (4), magnetism support (5) extensible extremely on arc extinguishing piece (4), its characterized in that: well seat (2) are keeping away from the one end of magnetic support (5) is equipped with and is used for the shutoff arc muscle group (22) of arc extinguishing clearance (41), keep off arc muscle group (22) including crisscross upper strata that sets up each other and keep off arc muscle (221) and lower floor's arc muscle (222), upper strata keep off arc muscle (221) with lower floor keeps off arc muscle (222) and shelters from adjacent two respectively the upper portion and the lower part of arc extinguishing clearance (41).

2. The arc chute of claim 1, wherein: a partition plate (23) is transversely arranged on the middle seat (2), the partition plate (23) is arranged in parallel to the base (1), an upper buffer wall (231) is convexly arranged on the outer edge of the partition plate (23) towards the cover body (3), an upper buffer area (24) is formed by enclosing the partition plate (23), the cover body (3) and the upper buffer wall (231), and the upper part of the arc extinguishing gap (41) can be communicated with the upper buffer area (24);

a lower buffer wall (232) is convexly arranged on one side, facing the base (1), of the outer edge of the partition plate (23), a lower buffer area (25) is formed among the partition plate (23), the base (1) and the lower buffer wall (232), and the lower part of the arc extinguishing gap (41) can be communicated with the lower buffer area (25);

the lower arc blocking rib (222) close to one side of the magnetic support (5) is provided with a notch, and the lower part of the arc extinguishing gap (41) close to one side of the magnetic support (5) is not blocked.

3. The arc chute of claim 2, wherein: the upper buffer area (24) is provided with a first air outlet (233) at one side far away from the magnetic support (5), and the lower buffer area (25) is provided with a second air outlet (234) at one side far away from the magnetic support (5).

4. The arc chute of claim 2, wherein: the upper-layer arc blocking rib (221) is convexly arranged on one side, far away from the base (1), of the partition plate (23), the upper-layer arc blocking rib (221) comprises a plurality of upper-layer stop blocks which are arranged at intervals, and each upper-layer stop block corresponds to the upper part of one arc extinguishing gap (41); the lower arc blocking rib (222) is convexly arranged on one side, close to the base (1), of the partition plate (23), the lower arc blocking rib (222) comprises a plurality of lower blocking blocks which are arranged at intervals, and each lower blocking block corresponds to the lower part of one arc extinguishing gap (41); the upper layer stop blocks and the lower layer stop blocks are arranged in a staggered mode.

5. The arc chute of claim 4, wherein: and a corner plate (31) is arranged on one side of the upper layer stop block, which is positioned at one end far away from the magnetic bracket (5), and the corner plate (31) blocks the arc extinguishing gap (41) at one end far away from the magnetic bracket (5).

6. The arc chute of claim 3, wherein: an air outlet channel (26) is arranged between the arc extinguishing sheet (4) which is positioned at one side closest to the magnetic support (5) and the edge of the middle seat (2), and a third air outlet (27) which is connected with the air outlet channel (26) and the upper buffer area (24) and a fourth air outlet (28) which is connected with the air outlet channel (26) and the lower buffer area (25) are arranged on the middle seat (2).

7. The arc chute of claim 6, wherein: the cross-sectional area of the third air outlet (27) is greater than the cross-sectional area of the fourth air outlet (28).

8. The arc chute of claim 6, wherein: the upper buffer wall (231) is extended with an extension wall (235) surrounding the outer edge of the air outlet channel (26) at one side facing the air outlet channel (26).

9. The arc chute according to any one of claims 1 to 7, characterized in that: and a fifth air outlet (29) is formed in one side of the middle seat (2) used for fixing a fixing column of the magnetic support (5).

10. The circuit breaker, its characterized in that: comprising a magnetic support (5) and an arc chute according to any one of claims 1 to 9, said magnetic support (5) being extendable onto said arc chute and said magnetic support (5) being provided with a stationary contact (51).

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