Arc extinguish chamber and circuit breaker

Abstract

The arc extinguish chamber comprises two flash barriers, a plurality of arc extinguish grid sheets arranged between the two flash barriers in a spaced and stacked mode and a reflection chamber arranged on the arc inlet side of the arc extinguish chamber, an arc extinguish groove formed in the arc inlet side of each arc extinguish grid sheet divides the arc inlet side of each arc extinguish grid sheet into two plug pins, and the reflection chamber is provided with an exhaust channel; the pins of the arc extinguishing grid sheets are inserted in the exhaust channel, the side surface of the arc extinguishing chamber provided with the flash barrier is provided with an exhaust hole, and the exhaust channel is communicated with the outside of the arc extinguishing chamber through the exhaust hole. The circuit breaker comprises the arc extinguish chamber. According to the arc extinguish chamber and the circuit breaker of the utility model, on the basis that the original arc extinguish chamber exhausts air through the exhaust side, high-temperature gas at the exhaust side enters the exhaust channel along the pins of the arc extinguish grid sheets through the exhaust channel arranged in the reflection chamber at the arc inlet side of the arc extinguish chamber and then is exhausted out of the arc extinguish chamber through the exhaust hole; the effect of cooling high-temperature free gas is achieved, the medium recovery strength between the conductors is improved, the back breakdown phenomenon is reduced, and rapid breaking of an arc is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to an arc extinguishing chamber and a circuit breaker. Background Art

[0002] DC interruption relies on high arc voltage, which puts a greater test on the insulation performance between conductors. As the interruption index increases, the current to be interrupted also increases, so it is necessary to increase the arc voltage to limit the short-circuit current and reduce the arc energy of the interruption. However, since there is still high-temperature free gas in the area behind the arc column (towards the contact), this will cause thermal breakdown under high arc voltage and generate a new arc. The generation of a new arc will short-circuit the arc that has entered the arc extinguishing chamber and make it disappear (equivalent to the arc exiting the arc extinguishing chamber grid). This phenomenon will repeat until the free gas in the back area gradually disappears until the withstand voltage strength of the back area is greater than the arc voltage. The repeated occurrence of back breakdown will increase the arc burning time and is not conducive to interruption. Summary of the invention

[0003] The utility model aims to overcome at least one defect of the prior art and provide an arc extinguishing chamber and a circuit breaker.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An arc extinguishing chamber, one side of the arc extinguishing chamber is an arc-entry side, and the other side is an exhaust side. The arc extinguishing chamber includes two arc-isolating plates, a plurality of arc-extinguishing grids stacked and spaced between the two arc-isolating plates, and a reflecting chamber arranged on the arc-entry side of the arc extinguishing chamber. The arc-extinguishing grooves provided on the arc-entry side of the arc-extinguishing grid divide the arc-entry side of the arc-extinguishing grid into two pins. The reflecting chamber is provided with an exhaust channel, and the pins of the arc-extinguishing grid are inserted in the exhaust channel. The arc extinguishing chamber is provided with an exhaust hole communicating with the exhaust channel on at least one side of the arc-isolating plate, and the exhaust channel is communicated with the outside of the arc extinguishing chamber through the exhaust hole.

[0006] Optionally, the reflection chamber is located between the two arc isolation plates, and the exhaust holes are arranged on the arc isolation plates.

[0007] Optionally, the exhaust hole is arranged on a side of the reflection chamber opposite to the arc isolation plate.

[0008] Optionally, the reflection chamber is a U-shaped structure having an avoidance gap between two arms for avoiding the moving contact, and an exhaust channel is respectively provided on the two arms of the reflection chamber.

[0009] Optionally, a plurality of partitions are provided in the exhaust passage, and the plurality of partitions are arranged at intervals to divide the exhaust passage into a plurality of independent slots, and a single pin of the arc extinguishing grid is inserted in a single slot.

[0010] Optionally, the arc extinguishing groove comprises a groove mouth portion and a groove tail portion which are sequentially arranged in a direction from the arc entry side to the exhaust side, wherein the groove tail portion is arranged close to the arc isolation plate on one side and away from the arc isolation plate on the other side.

[0011] Optionally, the width of the notch portion gradually decreases along the direction from the arc entry side to the exhaust side.

[0012] Optionally, the slot tail portion has an inclined section and a cavity sequentially arranged in a direction from the arc entry side to the exhaust side, wherein the inclined section is inclined in a direction gradually approaching the arc isolation plate on one side.

[0013] Optionally, the cavity is circular, oval or waist-shaped.

[0014] Optionally, the slot tails of two adjacent arc-extinguishing grids are arranged alternately.

[0015] Optionally, the plurality of arc-extinguishing grids are vertically arranged between two arc-isolating plates, and the plurality of arc-extinguishing grids are arranged in parallel and at intervals.

[0016] Optionally, the exhaust channel is provided with a first side opening opposite to the pin of the arc extinguishing grid and a second side opening opposite to the arc isolation plate, the first side opening and the second side opening are adjacent to each other, the pin of the arc extinguishing grid is inserted into the exhaust channel through the first side opening, the arc isolation plate covers the second side opening of the exhaust channel, and the exhaust hole is opened on the arc isolation plate corresponding to the second side opening.

[0017] Optionally, an arc-blocking plate is further included, one end of which is connected to the reflection chamber, and the other end of which is stacked above the uppermost arc-extinguishing grid.

[0018] Optionally, the exhaust direction of the exhaust hole is perpendicular to the exhaust direction of the exhaust outlet of the arc extinguishing chamber.

[0019] A circuit breaker comprises any one of the arc extinguishing chambers.

[0020] Optionally, the arc extinguishing chamber is installed between two opposite side walls of the shell, the exhaust side of the arc extinguishing chamber is connected to the air outlet of the shell, and an installation gap is left between the arc isolation plate of the arc extinguishing chamber and the side wall of the shell, the exhaust hole is connected to the installation gap, and the installation gap is connected to the air outlet.

[0021] The arc extinguishing chamber and circuit breaker of the utility model, on the basis of exhausting the original arc extinguishing chamber through the exhaust side, also use the exhaust channel opened in the reflection chamber on the arc entry side of the arc extinguishing chamber to allow the high-temperature gas on the exhaust side to enter the exhaust channel along the pins of the arc extinguishing grid and then be discharged from the arc extinguishing chamber from the exhaust hole, so as to achieve the effect of cooling the high-temperature free gas, thereby reducing the accumulation of the high-temperature free gas on the arc entry side of the arc extinguishing chamber, improving the dielectric recovery strength between the conductors, reducing the occurrence of back breakdown phenomenon, which is conducive to quickly breaking the arc and can be suitable for AC arc extinguishing and DC arc extinguishing.

[0022] In addition, when breaking, the arc is more likely to move along the notch and inclined section of the arc extinguishing grid to the rearmost cavity. The cavity is surrounded by annular side walls, which is conducive to fixing the position of the arc column and stabilizing the arc inside the arc extinguishing chamber, away from the arc entry side of the arc extinguishing chamber, thereby reducing the temperature of the arc entry side and helping to reduce the occurrence of breakdown.

[0023] In addition, placing the arc extinguishing grids horizontally can maximize the use of space to place more arc extinguishing grids, so that the arc is divided into more short arcs to increase the arc voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the gas flow in the arc extinguishing chamber in the shell of the utility model;

[0025] Figure 2 It is an assembly drawing of the arc extinguishing chamber of the utility model;

[0026] Figure 3 It is an exploded view of the arc extinguishing chamber of the utility model;

[0027] Figure 4 This is a structural schematic diagram of the first embodiment of the arc extinguishing grid of the utility model;

[0028] Figure 5 This is a schematic structural diagram of the arc-extinguishing grid embodiment 2 of the utility model;

[0029] Figure 6 It is a structural schematic diagram of the reflection chamber of the utility model;

[0030] Arc isolation plate 1; exhaust hole 11; mounting hole 12; arc extinguishing grid 2; arc extinguishing groove 21; notch portion 211; inclined section 212; cavity 213; pin 22; mounting protrusion 23; reflection chamber 3; partition 31; slot 32; avoidance gap 33; first side opening 34; second side opening 35; arc blocking plate 4; shell 5. DETAILED DESCRIPTION

[0031] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the arc extinguishing chamber and the circuit breaker of the utility model. The arc extinguishing chamber and the circuit breaker of the utility model are not limited to the description of the following embodiments.

[0032] like Figure 1As shown, the circuit breaker of this embodiment includes a housing 5 and a moving contact, a static contact and an arc extinguishing chamber installed in the housing 5, and also includes an operating mechanism, an overload protection mechanism, a short-circuit protection mechanism, etc. The operating mechanism drives the moving contact to swing and disconnect or close with the static contact to realize the disconnection or connection of the circuit breaker. The arc extinguishing chamber is used to extinguish the arc generated during the opening and closing of the moving contact and the static contact. The overload protection mechanism and the short-circuit protection mechanism are used to trigger the operating mechanism to trip when a circuit fault occurs, so that the operating mechanism drives the moving contact to disconnect from the static contact to realize the fault protection of the circuit. The housing 5 described in this embodiment includes an upper cover and a base, and the upper cover is covered on the base to form an installation chamber, and the moving contact, the static contact, the arc extinguishing chamber, the operating mechanism, the overload protection mechanism, and the short-circuit protection mechanism are installed in the installation chamber, and the handle connected to the operating mechanism passes through the upper cover for manual opening and closing operations. The arc extinguishing chamber has one side close to the moving contact as the arc-entry side, and the other side as the exhaust side with an exhaust outlet. An arc is generated during the opening and closing of the moving contact and the static contact. The arc enters the arc extinguishing chamber from the arc-entry side and is extinguished to generate high-temperature free gas, which is discharged from the arc extinguishing chamber from the exhaust side. Of course, the arc extinguishing chamber of this embodiment can also be applied to other switch devices such as contactors.

[0033] like Figure 1-3 As shown, the arc extinguishing chamber of this embodiment includes two arc-isolating plates 1, a plurality of arc-extinguishing grids 2 spaced and stacked between the two arc-isolating plates 1, and a reflecting chamber 3 arranged on the arc-entry side of the arc-extinguishing chamber, the arc-extinguishing grooves 21 provided on the arc-entry side of the arc-extinguishing grid 2 divide the arc-entry side of the arc-extinguishing grid 2 into two pins 22, in particular, the reflecting chamber 3 is provided with an exhaust channel, the pins 22 of the arc-extinguishing grid 2 are inserted in the exhaust channel, the arc-extinguishing chamber is provided with an exhaust hole 11 communicated with the exhaust channel on at least one side of the arc-isolating plate 1, and the exhaust channel is communicated with the outside of the arc-extinguishing chamber through the exhaust hole 11.

[0034] like Figure 1As shown, the arc extinguishing chamber is installed between two opposite side walls of the shell 5, and the arc extinguishing chamber is provided with an exhaust hole 11 communicated with the exhaust channel on the surface opposite to the side wall of the shell 5, that is, on the side where the arc isolation plate 1 is provided, the exhaust side of the arc extinguishing chamber is connected with the outlet hole of the shell 5, and an installation gap is reserved between the side of the arc isolation plate 1 of the arc extinguishing chamber and the side wall of the shell 5, the exhaust hole 11 is connected with the installation gap, and the installation gap is connected with the outlet hole. When the arc is disconnected, the arc is extinguished in the arc extinguishing chamber and high-temperature free gas is generated. The high-temperature free gas is not only discharged along the exhaust side of the arc extinguishing grid 2, but the high-temperature free gas accumulated on the arc inlet side can also enter the exhaust channel along the pins 22 of the arc extinguishing grid 2 for cooling and then be discharged from the exhaust hole 11, flow into the installation gap, flow from the installation gap flow channel to the exhaust side of the arc extinguishing chamber, and be discharged from the outlet hole of the shell 5, which is conducive to reducing the occurrence of back breakdown. The arc extinguishing chamber and the circuit breaker of this embodiment, on the basis of exhausting the original arc extinguishing chamber through the exhaust side, also use the exhaust channel opened in the reflection chamber 3 on the arc entry side of the arc extinguishing chamber to allow the high-temperature gas on the exhaust side to enter the exhaust channel along the pins 22 of the arc extinguishing grid 2 and then be discharged from the arc extinguishing chamber from the exhaust hole, so as to achieve the effect of cooling the high-temperature free gas, thereby reducing the accumulation of high-temperature free gas on the arc entry side of the arc extinguishing chamber, improving the dielectric recovery strength between conductors, reducing the occurrence of back breakdown phenomenon, and facilitating rapid arc breaking, which can be applied to AC arc extinguishing and DC arc extinguishing. In this embodiment, the arc extinguishing chamber is provided with exhaust holes 11 on both sides of the arc isolation plate 1, or only on 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; of course, the exhaust directions of the two can also be inclined to form an oblique angle.

[0035] like Figure 2-3 , Figure 6As shown, the reflection chamber 3 in this embodiment is located between the two arc-isolating plates 1, and the exhaust hole 11 is arranged on the arc-isolating plate 1, and the exhaust hole 11 is communicated with the exhaust channel. Specifically, in the structure of the exhaust channel in this embodiment, the exhaust channel is only provided with a first side opening 34 opposite to the pin 22 of the arc-extinguishing grid 2 and a second side opening 35 opposite to the arc-isolating plate 1, the first side opening 34 and the second side opening 35 are adjacent, the pin 22 of the arc-extinguishing grid 2 is inserted into the exhaust channel through the first side opening 34, the arc-isolating plate 1 serves as a side wall of the exhaust channel, and covers the second side opening 35 of the exhaust channel, and the exhaust hole 11 is provided on the arc-isolating plate 1 corresponding to the second side opening 35. The structure is simple, and the reflection chamber 3 is convenient to manufacture and form. The exhaust channel opening is only toward the arc-extinguishing grid 2 and the arc-isolating plate 1, and the high-temperature gas is effectively guided to the space between the arc-extinguishing chamber and the side wall of the shell, so as to avoid spraying to other parts in the shell and causing damage. Of course, the exhaust hole 11 can be arranged at any position on the arc-entry side of the arc-extinguishing chamber. As other embodiments, the exhaust hole 11 may not be arranged on the arc isolation plate 1, and the arc isolation plate 1 may not completely cover the second side opening 35 of the exhaust channel, and the exhaust hole 11 may be directly formed in the uncovered part; or, the reflection chamber 3 may not be arranged between the two arc isolation plates 1, or may be only partially located between the two arc isolation plates 1, and the exhaust hole 11 may be directly arranged on the side of the reflection chamber 3 opposite to the arc isolation plate 1. In addition, a plurality of partitions 31 are arranged in the exhaust channel, and the plurality of partitions 31 are arranged at intervals to divide the exhaust channel into a plurality of independent slots 32, and a single pin 22 of the arc extinguishing grid 2 is inserted into a single slot 32. The partition 31 divides the exhaust channel into slots 32 for inserting a single pin 22, so that the high-temperature gas is diverted, thereby improving the cooling effect of the reflection chamber 3. In this embodiment, the plurality of slots 32 are connected to the same exhaust hole 11, and of course, a plurality of exhaust holes 11 may be arranged to correspond to the plurality of slots 32 one by one.

[0036] like Figure 2-3 , Figure 6 As shown, the reflection chamber 3 of this embodiment is an integrally formed U-shaped structure, and the reflection chamber 3 has an avoidance gap 33 located between the two arms for avoiding the moving contact, and an exhaust channel is provided on each of the two arms of the reflection chamber 3. The reflection chamber 3 of this embodiment is interference-mounted on the arc-extinguishing grid 3 and is located between the two arc-isolating plates 1. Of course, the reflection chamber 3 and the arc-isolating plates 1 can also be integrally formed, or the reflection chamber 3 can be fixedly connected to the arc-isolating plates 1 by screw fixing, clamping fixing, etc. Of course, as other embodiments, the reflection chamber 3 can also be two independent vertical blocks, and the avoidance gap 33 is formed by symmetrical spacing. The reflection chamber 3 is preferably made of a gas-generating material, but of course it may not be a gas-generating material.

[0037] like Figure 4-5As shown, the structure of the arc extinguishing groove 21 of this embodiment, the arc extinguishing groove 21 includes a notch portion 211 and a groove tail portion sequentially arranged along the direction from the arc entry side to the exhaust side, wherein the groove tail portion is arranged close to the arc isolation plate 1 on one side and away from the arc isolation plate 1 on the other side. The groove tail portion has an inclined section 212 and a cavity 213 sequentially arranged along the direction from the arc entry side to the exhaust side, wherein the inclined section 212 is inclined in a direction gradually approaching the arc isolation plate 1 on one side. When breaking, the arc is more likely to move along the notch portion 211 and the inclined section 212 of the arc extinguishing grid 2 to the cavity 213 at the rear end. The cavity 213 is surrounded by an annular side wall, which is conducive to fixing the position of the arc column, so that the arc is stable inside the arc extinguishing chamber, away from the arc entry side of the arc extinguishing chamber, so that the temperature of the arc entry side can be reduced, which is conducive to reducing the occurrence of breakdown.

[0038] Preferably, the cavity 213 is circular, oval or waist-shaped. Figure 4 As shown, the cavity 213 of this embodiment is waist-shaped, and its length is greater than the width of the inclined section 212, so that the cavity 213 and the inclined section 212 form an L shape; Figure 5 As shown, the cavity 213 of this embodiment is elliptical, and its major axis is greater than the width of the inclined section 212, so that the cavity 213 and the inclined section 212 form a T-shape. Of course, the cavity 213 can also be other shapes such as an arch or a square. In addition, the slot portion 211 is similar to a V-shaped structure, and the width gradually decreases from the arc entry side to the exhaust side. The width of the slot portion 211 is greater than the width of the slot tail at the connection with the slot portion 211 (that is, the inclined section 212). The slot portion 211 is formed by two symmetrically arranged straight side walls, and the width of the slot portion 211 refers to the spacing distance between the two symmetrically arranged straight side walls; the inclined section 212 is formed by two parallel straight side walls, and the width of the inclined section 212 refers to the spacing distance between the two parallel straight side walls. Of course, as other inferior embodiments, the arc extinguishing slot 21 may not be provided with a slot tail, or the inclined section 212, or the cavity 213.

[0039] like Figure 1-3 As shown, the plurality of arc extinguishing grids 2 are vertically arranged between two arc isolation plates 1, that is, Figure 2-3The arc-isolating plate 1 is vertically arranged, the arc-extinguishing grid 2 is horizontally arranged, and the multiple arc-extinguishing grids 2 are arranged in parallel and spaced apart. The arc-extinguishing grids 2 are placed horizontally to maximize the use of space to place more arc-extinguishing grids 2, so that the arc is divided into more short arcs to increase the arc voltage. Of course, the arc-extinguishing grids 2 can also be slightly tilted. The arc-extinguishing grids 2 are fixedly connected to the arc-isolating plate 1, and mounting protrusions 23 are provided on both sides of the arc-extinguishing grid 2 for matching with the mounting holes 12 on the arc-isolating plate 1. The slot tails of two adjacent arc-extinguishing grids 2 can be staggered by flipping the arc-extinguishing grids 2 and riveting them to the arc-isolating plate 1 in turn, and the slot tails of two adjacent arc-extinguishing grids 2 are symmetrically arranged on both sides of the center line of the arc-extinguishing grid 2. The slot tails of the arc-extinguishing grids 2 are staggered and stacked, which is more conducive to separating the arc and improving the arc extinguishing effect.

[0040] like Figure 2-3 As shown, the arc extinguishing chamber of this embodiment further includes an arc baffle plate 4, which is an integrally formed L-shaped plate, one end of which is connected to the reflection chamber 3, and the other end is stacked above the topmost arc extinguishing grid 2. The arc baffle plate 4 spans the reflection chamber 3 and the arc extinguishing grid 2 to prevent the arc from ejecting from the top of the arc extinguishing chamber. The connection between the arc baffle plate 4 and the reflection chamber 3 can be fixed by a clamping method or the like.

[0041] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0042] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An arc extinguishing chamber, wherein one side of the arc extinguishing chamber is an arc-entry side and the other side is an exhaust side provided with an exhaust outlet, the arc extinguishing chamber comprising two arc-isolating plates (1), a plurality of arc-extinguishing grids (2) arranged in a stacked manner between the two arc-isolating plates (1), and a reflection chamber (3) arranged on the arc-entry side of the arc extinguishing chamber, an arc-extinguishing groove (21) provided on the arc-entry side of the arc-extinguishing grid (2) divides the arc-entry side of the arc-extinguishing grid (2) into two pins (22), characterized in that: The reflection chamber (3) is provided with an exhaust passage, the pins (22) of the arc extinguishing grid (2) are inserted into the exhaust passage, the arc extinguishing chamber is provided with an exhaust hole (11) communicating with the exhaust passage on at least one side where the arc isolation plate (1) is provided, and the exhaust passage is communicated with the outside of the arc extinguishing chamber through the exhaust hole (11).

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

3. The arc extinguishing chamber according to claim 1, characterized in that: The exhaust hole (11) is arranged on the side of the reflection chamber (3) opposite to the arc isolation plate (1).

4. The arc extinguishing chamber according to claim 1, characterized in that: The reflection chamber (3) is a U-shaped structure, having an avoidance gap (33) between two arms for avoiding the moving contact, and an exhaust channel is respectively provided on the two arms of the reflection chamber (3).

5. The arc extinguishing chamber according to claim 1 or 4, characterized in that: A plurality of partitions (31) are arranged in the exhaust passage, and the plurality of partitions (31) are arranged at intervals to divide the exhaust passage into a plurality of independent slots (32), and a single pin (22) of the arc extinguishing grid (2) is inserted in a single slot (32).

6. The arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing groove (21) comprises a groove opening portion (211) and a groove tail portion which are sequentially arranged in a direction from the arc entry side to the exhaust side, wherein the groove tail portion is arranged close to the arc isolation plate (1) on one side and away from the arc isolation plate (1) on the other side.

7. The arc extinguishing chamber according to claim 6, characterized in that: The width of the notch portion (211) gradually decreases along the direction from the arc entry side to the exhaust side.

8. The arc extinguishing chamber according to claim 6, characterized in that: The slot tail portion comprises an inclined section (212) and a cavity (213) which are sequentially arranged in a direction from the arc entry side to the exhaust side, wherein the inclined section (212) is inclined in a direction gradually approaching the arc isolation plate (1) on one side.

9. The arc extinguishing chamber according to claim 8, characterized in that: The mold cavity (213) is circular, elliptical or waist-shaped.

10. The arc extinguishing chamber according to claim 6, characterized in that: The slot tails of two adjacent arc-extinguishing grids (2) are arranged in a staggered manner.

11. The arc extinguishing chamber according to claim 1, characterized in that: The plurality of arc-extinguishing grids (2) are vertically arranged between two arc-isolating plates (1), and the plurality of arc-extinguishing grids (2) are arranged in parallel and at intervals.

12. The arc extinguishing chamber according to claim 2, characterized in that: The exhaust passage is provided with a first side opening (34) opposite to the pin (22) of the arc extinguishing grid (2) and a second side opening (35) opposite to the arc isolation plate (1); the first side opening (34) and the second side opening (35) are adjacent to each other; the pin (22) of the arc extinguishing grid (2) is inserted into the exhaust passage through the first side opening (34); the arc isolation plate (1) covers the second side opening (35) of the exhaust passage; and the exhaust hole (11) is provided on the arc isolation plate (1) and corresponds to the second side opening (35).

13. The arc extinguishing chamber according to claim 1, characterized in that: It also comprises an arc blocking plate (4), one end of which is connected to the reflection chamber (3), and the other end of which is arranged in a stacked manner above the uppermost arc extinguishing grid plate (2).

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, characterized in that: It comprises the arc extinguishing chamber described in any one of claims 1-14.

16. The circuit breaker according to claim 15, characterized in that: The arc extinguishing chamber is installed between two opposite side walls of the housing (5); the exhaust side of the arc extinguishing chamber is connected to the air outlet of the housing (5); an installation gap is left between the side of the arc isolation plate (1) of the arc extinguishing chamber and the side wall of the housing (5); the exhaust hole (11) is connected to the installation gap; and the installation gap is connected to the air outlet.

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