CN222320161U - Arc extinguishing chamber and circuit breaker - Google Patents

Abstract

The arc extinguishing chamber comprises two arc isolating plates, a plurality of arc extinguishing grid sheets which are arranged between the two arc isolating plates in a stacked mode at intervals and a reflecting chamber which is arranged on the arc inlet side of the arc extinguishing chamber, wherein the arc extinguishing grooves formed in the arc inlet side of the arc extinguishing grid sheets divide the arc inlet side of the arc extinguishing grid sheets into two pins, the reflecting chamber is provided with an exhaust channel, the pins of the arc extinguishing grid sheets are inserted in the exhaust channel, the arc extinguishing chamber is provided with exhaust holes on the side face provided with the arc isolating plates, and the exhaust channel is communicated with the outside of the arc extinguishing chamber through the exhaust holes. The circuit breaker comprises the arc extinguishing chamber. According to the arc extinguishing chamber and the circuit breaker, on the basis that the original arc extinguishing chamber exhausts through the exhaust side, the exhaust channel arranged on the reflecting chamber at the arc inlet side of the arc extinguishing chamber enables high-temperature gas at the exhaust side to enter the exhaust channel along the pins of the arc extinguishing grid plate and then to be exhausted from the exhaust hole, the effect of cooling high Wen Youli gas is achieved, the medium recovery strength between conductors is improved, the occurrence of back breakdown phenomenon is reduced, and rapid breaking of an arc is facilitated.

Description

Arc extinguishing chamber and circuit breaker

Technical Field

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

Background

Direct current breaking relies on high arc voltages, which lead to a greater challenge in the insulation properties between conductors. Along with the improvement of the breaking index, the current to be broken is increased, the arc voltage is required to be increased to limit the short-circuit current and reduce the breaking arc energy, but at the same time, the high-temperature free gas still exists in the area behind the arc column (in the direction of the contact), so that the thermal breakdown occurs under the high arc voltage to generate a new arc. The new arc will short the arc which has entered the arc-extinguishing chamber and will disappear (which is equivalent to the arc exiting from the arc-extinguishing chamber), this phenomenon will repeatedly appear until the free gas in the back area gradually disappears until the pressure resistance of the back area is greater than the arc voltage, and the repeated occurrence of back breakdown will cause the burning time to increase and be unfavorable for breaking.

Disclosure of Invention

The object of the present utility model is to overcome at least one of the drawbacks of the prior art and to provide an arc chute and a circuit breaker.

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

The arc extinguishing chamber, arc extinguishing chamber one side is the side of advancing the arc, and the opposite side is the exhaust side, the explosion chamber includes two flash barrier, interval range upon range of a plurality of arc extinguishing bars piece that set up between two flash barrier and the reflecting chamber of setting in the side of advancing the arc of explosion chamber, the arc extinguishing groove of advancing the arc side of arc extinguishing bars piece and dividing into two with the side of advancing the arc of arc extinguishing bars piece and participate in, the reflecting chamber is equipped with the exhaust passage, the participate in of arc extinguishing bars piece is inserted in the exhaust passage, be equipped with on at least one side of arc extinguishing chamber that is equipped with the flash barrier with exhaust passage communicating exhaust hole, the exhaust passage communicates with each other with the explosion chamber through exhaust hole.

Optionally, the reflection chamber is located between the two arc baffles, and the exhaust hole is arranged on the arc baffles.

Optionally, the vent hole is disposed on a side of the reflective chamber opposite the arc shield.

Optionally, the reflecting chamber is U-shaped structure, has the clearance of dodging that is used for dodging the moving contact that is located between two arms, respectively be equipped with an exhaust passage on the two arms of reflecting chamber.

Optionally, a plurality of baffles are arranged in the exhaust channel, the plurality of baffles are arranged at intervals to divide the exhaust channel into a plurality of independent slots, and single pins of the arc extinguishing grid plates are inserted in the single slots.

Optionally, the arc extinguishing groove includes the notch portion and the groove afterbody that set gradually along the direction of advancing arc side to exhaust side, wherein the groove afterbody is close to towards one side arc-stop plate, is kept away from towards the opposite side arc-stop plate and sets up.

Optionally, the notch portion gradually decreases in width in a direction from the inlet side to the exhaust side.

Optionally, the tail part of the groove is provided with an inclined section and a cavity which are sequentially arranged along the direction from the arc inlet side to the exhaust side, wherein the inclined section is obliquely arranged towards the direction gradually approaching to the arc baffle at one side.

Optionally, the cavity is round, oval or kidney-shaped.

Alternatively, the groove tail parts of two adjacent arc extinguishing grid plates are staggered.

Optionally, the arc extinguishing bars are vertically arranged between the two arc baffles, and the arc extinguishing bars are arranged in parallel at intervals.

Optionally, the exhaust channel is provided with a first side opening opposite to the pins of the arc extinguishing grid sheet and a second side opening opposite to the arc-isolating plate, the first side opening is adjacent to the second side opening, the pins of the arc extinguishing grid sheet are inserted into the exhaust channel through the first side opening, the arc-isolating plate covers the second side opening of the exhaust channel, and the exhaust hole is formed in the arc-isolating plate and corresponds to the second side opening.

Optionally, the device further comprises an arc baffle, wherein one end of the arc baffle is connected to the reflecting chamber, and the other end of the arc baffle is arranged above the arc extinguishing grid sheet on the uppermost layer in a stacked mode at intervals.

Optionally, the exhaust direction of the exhaust hole is perpendicular to the exhaust direction of the exhaust outlet of the arc extinguishing chamber.

A circuit breaker comprising any one of said arc-extinguishing chambers.

Optionally, the explosion chamber is installed between two opposite lateral walls of casing, and the exhaust side of explosion chamber and the venthole intercommunication of casing, and leave the installation clearance between the arc-shield plate of explosion chamber and the lateral wall of casing, exhaust hole and installation clearance intercommunication, installation clearance and venthole intercommunication.

According to the arc extinguishing chamber and the circuit breaker, on the basis that the original arc extinguishing chamber exhausts through the exhaust side, the high-temperature gas on the exhaust side is discharged from the exhaust hole after entering the exhaust channel along the pins of the arc extinguishing grid plate through the exhaust channel formed in the reflecting chamber on the arc inlet side of the arc extinguishing chamber, so that the effect of cooling the high-temperature Wen Youli gas is achieved, the accumulation of the high-temperature Wen Youli gas on the arc inlet side of the arc extinguishing chamber is reduced, the medium recovery strength between conductors is improved, the occurrence of the back breakdown phenomenon is reduced, the rapid breaking of an arc is facilitated, and the arc extinguishing chamber is suitable for alternating current arc extinguishing and direct current arc extinguishing.

In addition, when breaking, the arc is easier to move to the cavity of the tail part along the notch part and the inclined section of the arc extinguishing grid sheet, and the cavity is surrounded by the annular side wall, so that the position of the arc column of the arc is favorably fixed, the arc is stabilized inside the arc extinguishing chamber, and is far away from the arc inlet side of the arc extinguishing chamber, the temperature of the arc inlet side can be reduced, and the occurrence of breakdown phenomenon is favorably reduced.

In addition, the horizontal arrangement of the arc-extinguishing bars can maximally utilize the space to place more arc-extinguishing bars, so that the arc is divided into more short arcs to improve the arc voltage.

Drawings

Fig. 1 is a schematic diagram of the gas flow of an arc chute within a housing of the present utility model;

fig. 2 is an assembly view of the arc chute of the present utility model;

Fig. 3 is an exploded view of the arc chute of the present utility model;

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

fig. 5 is a schematic structural view of a second embodiment of an arc chute sheet according to the present utility model;

FIG. 6 is a schematic view of the structure of the reflection chamber of the present utility model;

Arc shield plate 1, exhaust hole 11, mounting hole 12, arc extinguishing gate 2, arc extinguishing groove 21, notch 211, inclined section 212, cavity 213, pin 22, mounting boss 23, reflection chamber 3, partition 31, slot 32, avoiding gap 33, first side opening 34, second side opening 35, arc shield plate 4, and case 5.

Detailed Description

Embodiments of the arc chute and circuit breaker of the present utility model are further described below with reference to the examples shown in the drawings. The arc chute and the circuit breaker of the present utility model are not limited to the description of the following embodiments.

As shown in fig. 1, the circuit breaker of this embodiment includes a housing 5, a moving contact, a fixed contact and an arc extinguishing chamber which are installed in the housing 5, and further includes an operating mechanism, an overload protection mechanism, a short-circuit protection mechanism, etc., wherein the operating mechanism drives the moving contact to swing and open or close with the fixed contact to realize breaking or closing of the circuit breaker, the arc extinguishing chamber is used for extinguishing an arc generated in the opening and closing process of the moving contact and the fixed contact, and the overload protection mechanism and the short-circuit protection mechanism are used for triggering the operating mechanism to trip when a circuit fails, so that the operating mechanism drives the moving contact to disconnect with the fixed contact, thereby realizing the fault protection of the circuit. In this embodiment, the housing 5 includes an upper cover and a base, where the upper cover is covered on the base to form an installation cavity, and the moving contact, the fixed contact, the arc extinguishing chamber, the operating mechanism, the overload protection mechanism and the short-circuit protection mechanism are installed in the installation cavity, and a handle connected with the operating mechanism penetrates out of the upper cover for manual opening and closing operation. One side of the arc extinguishing chamber, which is close to the moving contact, is an arc inlet side, the other side is an exhaust side provided with an exhaust outlet, an arc can be generated in the opening and closing process of the moving contact and the fixed contact, the arc enters the arc extinguishing chamber from the arc inlet side and is extinguished, high Wen Youli gas is generated, and high Wen Youli gas is discharged out of the arc extinguishing chamber from the exhaust side. Of course, the arc extinguishing chamber of the present embodiment may also be applied to other switching devices such as contactors.

As shown in fig. 1-3, the arc extinguishing chamber of the present embodiment includes two arc-isolating plates 1, a plurality of arc-extinguishing gate sheets 2 stacked between the two arc-isolating plates 1 at intervals, and a reflecting chamber 3 disposed on the arc-entering side of the arc extinguishing chamber, wherein an arc-extinguishing slot 21 formed on the arc-entering side of the arc-extinguishing gate sheet 2 divides the arc-entering side of the arc-extinguishing gate sheet 2 into two pins 22, in particular, the reflecting chamber 3 is provided with an exhaust channel, the pins 22 of the arc-extinguishing gate sheet 2 are inserted in the exhaust channel, at least one side of the arc extinguishing chamber provided with the arc-extinguishing plate 1 is provided with an exhaust hole 11 communicated with the exhaust channel, and the exhaust channel is communicated with the outside of the arc extinguishing chamber through the exhaust hole 11.

As shown in fig. 1, the arc extinguishing chamber is installed between two opposite side walls of the shell 5, the arc extinguishing chamber is arranged on the side surface opposite to the side wall of the shell 5, namely, on the side surface provided with the arc-isolating plate 1, an exhaust hole 11 communicated with an exhaust channel is arranged, the exhaust side of the arc extinguishing chamber is communicated with an air outlet hole of the shell 5, an installation gap is reserved between the side surface of the arc-isolating plate 1 of the arc extinguishing chamber and the side wall of the shell 5, the exhaust hole 11 is communicated with the air outlet hole, when the arc extinguishing chamber is disconnected, the arc extinguishes and generates high Wen Youli gas, the high Wen Youli gas is discharged along the exhaust side of the arc extinguishing gate 2, the high Wen Youli gas accumulated on the arc inlet side can be discharged from the exhaust hole 11 after entering the exhaust channel along the pins 22 of the arc extinguishing gate 2 for cooling, flows into the installation gap, is discharged from the exhaust hole from the installation gap channel to the outside of the exhaust side of the arc extinguishing chamber, and is discharged from the air outlet hole of the shell 5, and the occurrence of a back breakdown phenomenon is reduced. The explosion chamber and the circuit breaker of this embodiment, on original explosion chamber carries out the exhaust through the exhaust side on the basis, still make the high-temperature gas of exhaust side discharge explosion chamber from the exhaust hole after the gas inlet of the reflection chamber 3 of arc inlet side of explosion chamber gets into the exhaust passageway along the pin 22 of arc extinguishing bars piece 2, reach the gaseous effect of cooling high Wen Youli, thereby reduce the piling up of high Wen Youli gas at the arc inlet side of explosion chamber, improve the medium recovery intensity between the conductor, reduce the appearance of back breakdown phenomenon, be favorable to breaking the electric arc fast, can be applicable to exchanging arc extinction and direct current arc extinction. In this embodiment, the arc extinguishing chamber is provided with the exhaust holes 11 on both sides provided with the arc barrier 1, or may be provided with the exhaust holes 11 on only one side. Preferably, the exhaust direction of the exhaust hole 11 is perpendicular to the exhaust direction of the exhaust outlet of the arc extinguishing chamber, and of course, the exhaust directions of the exhaust hole 11 and the exhaust outlet of the arc extinguishing chamber can be obliquely arranged and form an oblique angle.

As shown in fig. 2-3 and fig. 6, in this embodiment, the reflection chamber 3 is located between the two arc baffles 1, the exhaust hole 11 is disposed on the arc baffles 1, and the exhaust hole 11 is communicated with the exhaust channel. Specifically, in the structure of the exhaust channel of this embodiment, the exhaust channel is only provided with a first side opening 34 opposite to the pin 22 of the arc extinguishing grid plate 2 and a second side opening 35 opposite to the arc baffle plate 1, the first side opening 34 and the second side opening 35 are adjacent, the pin 22 of the arc extinguishing grid plate 2 is inserted into the exhaust channel through the first side opening 34, the arc baffle plate 1 is used as a side wall of the exhaust channel, the second side opening 35 of the exhaust channel is covered, and the exhaust hole 11 is opened on the arc baffle plate 1 and corresponds to the second side opening 35. Simple structure is convenient for reflection room 3 manufacturing shaping, and exhaust passage opening only is towards arc extinguishing bars piece 2 and flash barrier 1, and effective guide high temperature gas is to between explosion chamber and the casing lateral wall, avoids spouting other spare part in the casing and causes the harm. Of course, the exhaust hole 11 may be provided at any position on the arc inlet side of the arc extinguishing chamber. As other embodiments, the vent hole 11 may be formed directly in the uncapped portion by incompletely capping the second side opening 35 of the vent passage by the arc-shaped plate 1 instead of being provided in the arc-shaped plate 1, or the reflection chamber 3 may be provided between the arc-shaped plates 1 without being provided therebetween or only partially between the arc-shaped plates 1, and the vent hole 11 may be provided directly on the side of the reflection chamber 3 opposite to the arc-shaped plate 1. In addition, a plurality of partition plates 31 are arranged in the exhaust channel, the partition plates 31 are arranged at intervals to divide the exhaust channel into a plurality of independent slots 32, and the single pins 22 of the arc extinguishing grid plates 2 are inserted into the single slots 32. The exhaust passage is partitioned into slots 32 for insertion of the single pins 22 by the partition plate 31, so that the high-temperature gas is branched, and the cooling effect of the reflection chamber 3 is improved. The plurality of slots 32 of the present embodiment are communicated with the same air vent 11, and of course, a plurality of air vents 11 may be provided for one-to-one correspondence with the plurality of slots 32.

As shown in fig. 2-3 and fig. 6, the reflecting chamber 3 in this embodiment is of an integrally formed U-shaped structure, the reflecting chamber 3 has an avoidance gap 33 between two arms for avoiding the moving contact, and two arms of the reflecting chamber 3 are respectively provided with an exhaust channel. The reflection chamber 3 in this embodiment is installed on the arc extinguishing grid sheet 3 in an interference manner and is located between the two arc baffles 1, and of course, the reflection chamber 3 and the arc baffles 1 may be integrally formed, or the reflection chamber 3 may be fixedly connected with the arc baffles 1 by fixing means such as screw fixing and clamping fixing. Of course, as other embodiments, the reflecting chamber 3 may be two independent vertical blocks, and the avoiding gap 33 is formed by symmetrical interval arrangement. The reflective chamber 3 is preferably made of a gas generating material, although it may not.

As shown in fig. 4 to 5, the arc extinguishing groove 21 of the present embodiment has a structure in which the arc extinguishing groove 21 includes a notch portion 211 and a groove tail portion which are disposed in order along a direction from an arc inlet side to an exhaust side, wherein the groove tail portion is disposed toward one side arc-shield plate 1 and away from the other side arc-shield plate 1. The tail part of the groove is provided with an inclined section 212 and a cavity 213 which are sequentially arranged along the direction from the arc inlet side to the exhaust side, wherein the inclined section 212 is obliquely arranged towards the direction gradually approaching to the arc baffle plate 1 at one side. When breaking, the arc moves to the cavity 213 of the tail part along the notch 211 and the inclined section 212 of the arc extinguishing grid sheet 2 more easily, the cavity 213 is surrounded by the annular side wall, which is beneficial to fixing the position of the arc column of the arc, stabilizing the arc inside the arc extinguishing chamber and keeping away from the arc inlet side of the arc extinguishing chamber, reducing the temperature of the arc inlet side and reducing the occurrence of breakdown phenomenon.

Preferably, the cavity 213 is circular, oval or kidney-shaped. As shown in fig. 4, the cavity 213 of the present embodiment is in a kidney shape having a length larger than the width of the inclined section 212 so that the cavity 213 and the inclined section 212 are L-shaped, and as shown in fig. 5, the cavity 213 of the present embodiment is in an oval shape having a major axis larger than the width of the inclined section 212 so that the cavity 213 and the inclined section 212 are T-shaped. Of course, the cavity 213 may have other shapes such as arcuate, square, etc. Further, the notched portion 211 is similar to a V-shaped structure in that the width of the notched portion 211 gradually decreases in the direction of the inlet side toward the exhaust side, and the width of the notched portion 211 is larger than the width of the tail portion of the slot at the junction with the notched portion 211 (i.e., the inclined section 212). The notch portion 211 is formed by spacing two symmetrically arranged straight side walls, the width of the notch portion 211 refers to the spacing distance between the two symmetrically arranged straight side walls, the inclined section 212 is formed by spacing two parallel arranged straight side walls, and the width of the inclined section 212 refers to the spacing distance between the two parallel arranged straight side walls. Of course, as other degraded embodiments, the arc extinguishing groove 21 may be provided without a groove tail, or without an inclined section 212, or without a cavity 213.

As shown in fig. 1-3, the arc-extinguishing grid plates 2 are vertically arranged between two arc-extinguishing plates 1, that is, as shown in fig. 2-3, the arc-extinguishing plates 1 are vertically arranged, the arc-extinguishing grid plates 2 are horizontally arranged, and the arc-extinguishing grid plates 2 are arranged in parallel at intervals. The horizontal placement of the arc extinguishing bars 2 can maximally utilize the space to place more arc extinguishing bars 2, so that the arc is divided into more short arcs to improve the arc voltage. Of course, the arc-extinguishing bars 2 can also be arranged slightly inclined. The arc extinguishing grating sheet 2 is fixedly connected with the arc barrier 1, and mounting protrusions 23 are arranged on two sides of the arc extinguishing grating sheet 2 and are used for being matched with mounting holes 12 in the arc barrier 1. The arc-extinguishing grid plates 2 can be sequentially turned over and riveted on the arc-isolating plates 1 to realize staggered arrangement of the groove tail parts of two adjacent arc-extinguishing grid plates 2, and the groove tail parts of the two adjacent arc-extinguishing grid plates 2 are symmetrically arranged on two sides of the center line of the arc-extinguishing grid plates 2. The tail parts of the arc extinguishing bars 2 are staggered and laminated, which is more beneficial to separating the arc and improving the arc extinguishing effect.

As shown in fig. 2-3, the arc extinguishing chamber of this embodiment further includes an arc baffle plate 4, where the arc baffle plate 4 is an integrally formed L-shaped sheet, one end of the arc baffle plate 4 is connected to the reflection chamber 3, and the other end is stacked above the arc extinguishing grid sheet 2 on the uppermost layer at intervals. The arc baffle 4 spans the reflecting chamber 3 and the arc extinguishing grid 2 to prevent the arc from being ejected from the upper part of the arc extinguishing chamber. The arc baffle 4 and the reflecting chamber 3 can be connected by adopting a clamping connection mode and other fixed connection modes.

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

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

Claims (16)

1. The arc extinguishing chamber comprises two arc isolating plates (1), a plurality of arc extinguishing grid plates (2) which are arranged between the two arc isolating plates (1) in a stacked mode at intervals and a reflecting chamber (3) which is arranged on the arc inlet side of the arc extinguishing chamber, wherein the arc extinguishing grooves (21) formed in the arc inlet side of the arc extinguishing grid plates (2) divide the arc inlet side of the arc extinguishing grid plates (2) into two pins (22), and the arc extinguishing chamber is characterized in that the reflecting chamber (3) is provided with an exhaust channel, the pins (22) of the arc extinguishing grid plates (2) are inserted in the exhaust channel, and at least one side provided with the arc isolating plates (1) is provided with exhaust holes (11) which are communicated with the exhaust channel, and the exhaust channel is communicated with the arc extinguishing chamber through the exhaust holes (11).

2. The arc extinguishing chamber according to claim 1, characterized in that the reflecting chamber (3) is located between the two arc baffles (1), and the exhaust hole (11) is arranged on the arc baffles (1).

3. The arc chute as claimed in claim 1, characterized in that the vent hole (11) is provided on the opposite side of the reflective chamber (3) from the arc barrier (1).

4. The arc extinguishing chamber according to claim 1, wherein the reflecting chamber (3) has a U-shaped structure and is provided with an avoidance gap (33) between two arms for avoiding the moving contact, and two exhaust channels are respectively arranged on the two arms of the reflecting chamber (3).

5. The arc extinguishing chamber according to claim 1 or 4, wherein a plurality of partition boards (31) are arranged in the exhaust passage, the partition boards (31) are arranged at intervals to divide the exhaust passage into a plurality of independent slots (32), and the single pins (22) of the arc extinguishing grid sheet (2) are inserted into the single slots (32).

6. The arc extinguishing chamber according to claim 1, wherein the arc extinguishing chamber (21) comprises a chamber part (211) and a chamber tail part which are sequentially arranged along the direction from the arc inlet side to the exhaust side, and the chamber tail part is close to one side of the arc-isolating plate (1) and far from the other side of the arc-isolating plate (1).

7. The arc extinguishing chamber according to claim 6, wherein the notch portion (211) gradually decreases in width in a direction from the arc inlet side toward the exhaust side.

8. The arc extinguishing chamber according to claim 6, wherein the slot tail has an inclined section (212) and a cavity (213) arranged in order along a direction from an arc inlet side to an exhaust side, wherein the inclined section (212) is arranged obliquely in a direction gradually approaching the one-sided arc shield (1).

9. The arc chute as claimed in claim 8, wherein the cavity (213) is circular, oval or kidney-shaped.

10. The arc extinguishing chamber according to claim 6, characterized in that the groove tails of two adjacent arc extinguishing bars (2) are staggered.

11. The arc extinguishing chamber according to claim 1, wherein the plurality of arc extinguishing gate sheets (2) are vertically arranged between the two arc baffles (1), and the plurality of arc extinguishing gate sheets (2) are arranged in parallel at intervals.

12. The arc extinguishing chamber according to claim 2, wherein the exhaust passage is provided with a first side opening (34) opposite to the pins (22) of the arc extinguishing grid plate (2) and a second side opening (35) opposite to the arc barrier plate (1), the first side opening (34) and the second side opening (35) are adjacent, the pins (22) of the arc extinguishing grid plate (2) are inserted into the exhaust passage through the first side opening (34), the arc barrier plate (1) covers the second side opening (35) of the exhaust passage, and the exhaust hole (11) is formed in the arc barrier plate (1) and corresponds to the second side opening (35).

13. The arc extinguishing chamber according to claim 1, further comprising an arc baffle plate (4), wherein one end of the arc baffle plate (4) is connected to the reflecting chamber (3), and the other end is arranged above the arc extinguishing grid plate (2) at the uppermost layer in a stacked manner at intervals.

14. The arc extinguishing chamber according to claim 1, characterized in that the exhaust direction of the exhaust hole (11) is perpendicular to the exhaust direction of the exhaust outlet of the arc extinguishing chamber.

15. A circuit breaker comprising an arc chute according to any one of claims 1-14.

16. The circuit breaker according to claim 15, wherein the arc extinguishing chamber is installed between opposite side walls of the housing (5), an exhaust side of the arc extinguishing chamber is communicated with an air outlet hole of the housing (5), an installation gap is left between a side surface of the arc-isolating plate (1) of the arc extinguishing chamber and the side wall of the housing (5), the exhaust hole (11) is communicated with the installation gap, and the installation gap is communicated with the air outlet hole.