Arc extinguish chamber structure and circuit breaker

Abstract

The utility model relates to an arc extinguish chamber structure and a circuit breaker, the arc extinguish chamber structure comprises two supporting plates, a plurality of metal grid sheets and an insulating seat, and the two supporting plates are oppositely arranged at an interval to form a mounting space; the metal gate sheets are accommodated in the mounting space, the two ends of the metal gate sheets are fixedly connected to the two supporting plates respectively, and the multiple metal gate sheets are stacked to form multiple arc discharge grooves; the insulating seat is located in the mounting space, the insulating seat comprises a seat body with a first air hole and a second air hole, and a plurality of first insulating gate sheets and a plurality of second insulating gate sheets which are fixedly connected to the seat body, and the first insulating gate sheets and the second insulating gate sheets are arranged at intervals along the overlapping direction of the metal gate sheets and extend from the middle part of the seat body in a back-to-back manner; the first insulated gate sheet and the second insulated gate sheet are located in the arc discharge groove and abut against the metal gate sheet and one of the two supporting plates. The first air holes are located between the two adjacent first insulated gate sheets, and the second air holes are located between the two adjacent second insulated gate sheets, and are correspondingly communicated with the arc discharge grooves.

Description

Technical Field

[0001] The utility model relates to the technical field of arc extinguishing of circuit breakers, in particular to an arc extinguishing chamber structure and a circuit breaker. Background Art

[0002] Compared with traditional 400V circuit breakers, high-voltage circuit breakers have higher energy in breaking arcs, which are more harmful to the distribution box and other components in the box. In order to deal with this situation, high-voltage circuit breakers on the market are usually equipped with a huge arc shield outside the main switch, which makes the overall size of the circuit breaker larger, resulting in a reduction in the available space in the circuit control box, and hindering the installation of other circuit control components, which increases the overall cost of the circuit control box.

[0003] Existing improvements include changing the arc extinguishing grid from a single metal grid to a combination of a metal grid and an insulating grid, extending the same number of insulating grids on the side of the metal grid away from the contact, and using the cooling effect of the insulating grids on the arc to keep the arc in the arc extinguishing chamber. However, this method also requires opening a slot in the circuit breaker for installing the insulating grids, or pre-assembling the insulating grids and the metal grids. Due to the large number of arc extinguishing grids, batch assembly is time-consuming and labor-intensive, and there are cases of missed connections, wrong connections, and damage and wear at the connections. Once the above problems occur during assembly, there is a risk of arc breakdown of the arc extinguishing grids when the actual circuit is connected and disconnected, which damages the operator's work safety. Utility Model Content

[0004] Since the insulating grids in the existing high-voltage circuit breakers have the problem that the assembly quality and speed cannot be taken into account at the same time, it is necessary to provide an arc extinguishing chamber structure and a circuit breaker.

[0005] An arc extinguishing chamber structure, comprising:

[0006] Two support plates, the two support plates are arranged opposite to each other and spaced apart to form an installation space;

[0007] A plurality of metal grids, the metal grids are accommodated in the installation space, two ends of the metal grids are respectively fixedly connected to the two support plates, and the plurality of metal grids are stacked to form a plurality of arc grooves; and

[0008] An insulating seat, the insulating seat is located in the installation space, the insulating seat comprises a seat body having a first air hole and a second air hole, and a plurality of first insulating grids and a plurality of second insulating grids fixedly connected to the seat body, the first insulating grids and the second insulating grids are alternately arranged along the stacking direction of the metal grids, and respectively extend backward from the middle of the seat body;

[0009] The first insulating grid and the second insulating grid are both located in the arc-drawing groove and abut against the metal grid and one of the two support plates. The first air hole is located between two adjacent first insulating grids, and the second air hole is located between two adjacent second insulating grids. The first air hole and the second air hole are respectively connected to the arc-drawing groove.

[0010] With such arrangement, the first insulating grid and the second insulating grid are fixed by the base body, and during assembly, all the insulating grids can be in contact with all the metal grids at the same time, and the assembly efficiency is high; the first insulating grid and the second insulating grid can also limit the shaking of the edges of the metal grids, so that the width of the arc-drawing groove is relatively fixed, thereby ensuring the stability of arc extinguishing, which is beneficial to preventing the arc from breaking through the metal grid; the first insulating grid and the second insulating grid extend backward from the middle of the base body so that the first air holes and the second air holes are staggered, and even if the arc overflows from two adjacent arc-drawing grooves, it is difficult to gather and reignite, and the first insulating grid and the second insulating grid do not interfere with each other. At the same time, on the basis of the insulating grids correspondingly provided in each arc-drawing groove, the distance between the two adjacent first insulating grids and the distance between the two adjacent second insulating grids are increased, thereby enhancing the cooling effect on the arc.

[0011] In one embodiment, the extension direction of the first insulating gate and the second insulating gate are both perpendicular to the stacking direction of the metal gate.

[0012] With such arrangement, the structure is neat, the insulating seat and the plurality of metal grids can be assembled quickly, the metal grids are not easily damaged, and batch processing of the insulating seat is also convenient.

[0013] In one embodiment, the first insulating grid has a first guiding slope, the first guiding slope is located at one end of the first insulating grid close to the middle of the base, and the first guiding slope gradually approaches the support plate in a direction away from the base.

[0014] In one embodiment, the second insulating grid has a second guiding slope, the second guiding slope is located at one end of the second insulating grid close to the middle of the base, and the second guiding slope gradually approaches the support plate in a direction away from the base.

[0015] In this arrangement, the first guiding bevel and the second guiding bevel are used to guide the airflow in the arc-drawing groove toward the first air hole and the second air hole, thereby preventing the arc from reigniting in the arc extinguishing chamber due to the backflow of the airflow, thereby improving the arc extinguishing efficiency.

[0016] In one embodiment, the metal grid includes a metal plate, a first mounting foot and a second mounting foot located at two opposite ends of the metal plate, and the support plate is provided with a first slot and a second slot corresponding to the first mounting foot and the second mounting foot respectively.

[0017] Such an arrangement also facilitates the replacement of metal grids, reduces maintenance costs, and avoids material waste.

[0018] In one embodiment, the distances between the first mounting foot and the second mounting foot and the insulating seat are different, and in two adjacent metal grids, the first mounting foot located on one of the metal grids and the second mounting foot located on the other metal grid are respectively connected to the support plate on the same side.

[0019] With this arrangement, the metal grids are arranged in a staggered manner, and the first and second slots corresponding to the two mounting feet of the metal grids are also arranged in a staggered manner, which helps prevent the local slots on the support plate from being too concentrated, thereby increasing the overall rigidity of the arc extinguishing chamber structure.

[0020] In one embodiment, the metal grid is provided with a guide groove, the guide groove is located at a side of the metal grid away from the base, and the width of the guide groove gradually decreases in a direction toward the base.

[0021] With such arrangement, after the airflow enters the guide groove, it can quickly flow toward the first air hole and the second air hole without backflow, which is beneficial to improving the efficiency of air blowing out the arc.

[0022] In one of the embodiments, the guide groove gradually deflects toward a side close to the first mounting foot along a direction toward the seat body.

[0023] With such arrangement, under the premise of the staggered arrangement of two adjacent metal grids, the airflow flows into the arc-drawing groove and is guided by the guide groove toward the first mounting foot, that is, flows toward the two sides of the arc extinguishing chamber, so that it flows out from the first air hole and the second air hole more smoothly and is not easily re-ignited after flowing out.

[0024] The present application also provides a circuit breaker, comprising a housing, a cover, a plurality of metal meshes, a static contact, a moving contact and an arc extinguishing chamber structure as described above, wherein the housing is provided with an air outlet, the cover and the arc extinguishing chamber structure are both located in the housing, the cover is spaced apart from the insulating seat and the cover is provided with an installation opening connected to the air outlet, the first air vent and the second air vent, and the plurality of metal meshes are located at the installation opening and fixedly connected to the cover;

[0025] The static contact is fixedly connected to the housing and abuts against the arc extinguishing chamber structure, and the moving contact is located on a side of the arc extinguishing chamber structure away from the gas outlet and is movably connected to the housing.

[0026] With such an arrangement, the arc extinguishing chamber structure provided in the present application can prevent the arc from being sprayed outside the metal grid before being extinguished. The multiple metal meshes can absorb the metal particles and droplets in the free arc and gas, thereby improving the arc extinguishing effect.

[0027] In one embodiment, the outer wall of the housing adjacent to the stationary contact is recessed to form a socket groove.

[0028] With such an arrangement, the circuit breaker is miniaturized, the external protrusion of the shell is reduced, and it is beneficial to reduce the overall occupied space of the circuit breaker.

[0029] In one embodiment, the cover includes an outer frame and two partition plates fixedly connected to the outer frame, the outer frame is provided with a makeshift groove adapted to the socket groove, the partition plate includes a mounting portion and a guide portion extending from the mounting portion toward the insulating seat, the guide portion extends toward the static contact along the extension direction and abuts against the insulating seat.

[0030] With such arrangement, the guide portion is inclined toward the static contact, guiding the airflow to the three chambers divided by two partition plates in the cover, which is beneficial to combing the airflow flowing out of the arc extinguishing chamber structure and avoiding the arc being concentrated on one side of the give way groove of the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a circuit breaker in an embodiment of the utility model;

[0032] Figure 2 for Figure 1 a cross-sectional view of the circuit breaker shown;

[0033] Figure 3 for Figure 2 A partial structural schematic diagram of the circuit breaker shown;

[0034] Figure 4 for Figure 3 a cross-sectional view of the structure shown;

[0035] Figure 5 for Figure 4 Structural schematic diagram of the middle insulating seat;

[0036] Figure 6 for Figure 4 Schematic diagram of the structure of the metal plate and the support plate assembly.

[0037] Reference numerals:

[0038] 10. Shell; 11. Socket slot; 12. Air outlet; 21. Cover; 211. Mounting port; 212. Outer frame; 213. Partition plate; 2131. Mounting portion; 2132. Guide portion; 2133. Give way slot; 22. Metal mesh; 31. Stationary contact; 32. Moving contact; 40. Arc extinguishing chamber structure; 41. Support plate; 411. First card slot; 412. Second card slot; 42. Metal grid; 421. Metal plate; 422. First mounting foot; 423. Second mounting foot; 424. Guide slot; 43. Insulating seat; 431. Seat body; 4311. First air vent; 4312. Second air vent; 432. First insulating grid; 4321. First guide slope; 433. Second insulating grid; 4331. Second guide slope; 44. Arcing slot; 50. Gas producing part. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0045] Compared with traditional 400V circuit breakers, high-voltage circuit breakers have higher energy in breaking arcs, which are more harmful to the distribution box and other components in the box. In order to deal with this situation, high-voltage circuit breakers on the market are usually equipped with a huge arc shield outside the main switch, which makes the overall size of the circuit breaker larger, resulting in a reduction in the available space in the circuit control box, and hindering the installation of other circuit control components, which increases the overall cost of the circuit control box.

[0046] Existing improvements include changing the arc extinguishing grid from a single metal grid 42 to a combination of a metal grid 42 and an insulating grid, extending the same number of insulating grids on the side of the metal grid 42 away from the contact, and using the cooling effect of the insulating grids on the arc to keep the arc in the arc extinguishing chamber. However, this method also requires a slot for installing the insulating grid in the circuit breaker, or pre-assembling the insulating grid and the metal grid 42. Due to the large number of arc extinguishing grids, batch assembly is time-consuming and labor-intensive, and there are cases of missed connections, wrong connections, and damage and wear at the connections. Once the above problems occur during assembly, there is a risk of arc breakdown of the arc extinguishing grid when the actual circuit is connected and disconnected, which damages the operating safety of the operator.

[0047] See also Figure 1 and Figure 2 , Figure 1 Schematic diagram of the structure of a circuit breaker in an embodiment of the utility model. Figure 2 for Figure 1 A cross-sectional view of the circuit breaker shown.

[0048] A circuit breaker provided in the present application includes a shell 10, a cover 21, multiple metal meshes 22, a static contact 31, a moving contact 32, two gas-producing parts 50 and an arc-extinguishing chamber structure 40. The shell 10 is provided with a gas outlet 12. The cover 21 and the arc-extinguishing chamber structure 40 are both located in the shell 10. The cover 21 and the insulating seat 43 are arranged at intervals and the cover 21 is provided with a mounting port 211 connected to the gas outlet 12. The multiple metal meshes 22 are located at the mounting port 211 and are fixedly connected to the cover 21; the static contact 31 is fixedly connected to the shell 10 and abuts against the arc-extinguishing chamber structure 40, the moving contact 32 is located on the side of the arc-extinguishing chamber structure 40 away from the gas outlet 12 and is movably connected to the shell 10, and the two gas-producing parts 50 are arranged at intervals to form a space for accommodating the static contact 31 and the moving contact 32.

[0049] In particular, in the above embodiment, the outer wall of the housing 10 near the stationary contact 31 is recessed to form the socket slot 11. In this way, the circuit breaker is miniaturized, the outer protrusion of the housing 10 is reduced, and the overall occupied space of the circuit breaker is reduced.

[0050] Furthermore, the cover 21 includes an outer frame 212 and two partition plates 213 fixedly connected to the outer frame 212. The outer frame 212 is provided with a clearance groove 2133 adapted to the socket groove 11. The partition plate 213 includes a mounting portion 2131 and a guide portion 2132 extending from the mounting portion 2131 toward the insulating seat 43. The guide portion 2132 extends toward the static contact 31 along the extending direction and abuts against the insulating seat 43. The guide portion 2132 is inclined toward the static contact 31, and guides the airflow to the three chambers divided by the two partition plates 213 in the cover 21, which is conducive to combing the airflow flowing out of the arc extinguishing chamber structure 40 and preventing the arc from being concentrated on one side of the clearance groove 2133 of the cover 21.

[0051] In view of the problem that the assembly quality and speed of the insulating grid in the existing high-voltage circuit breaker cannot be balanced, the arc extinguishing chamber structure 40 provided in the present application includes two support plates 41, a plurality of metal grids 42 and an insulating seat 43. Please refer to Figures 3 to 5 , Figure 3 for Figure 2 The schematic diagram of the partial structure of the circuit breaker shown in the figure is as follows: Figure 4 for Figure 3 A cross-sectional view of the structure shown, Figure 5 for Figure 4 A schematic structural diagram of the middle insulating seat 43.

[0052] The two support plates 41 are arranged opposite to each other and spaced apart to form an installation space, and the metal grid 42 and the insulating seat 43 are both accommodated in the installation space.

[0053] Two ends of the metal grid 42 are fixedly connected to the two support plates 41 , respectively. A plurality of metal grids 42 are stacked to form a plurality of arc-drawing grooves 44 .

[0054] The insulating seat 43 is located in the installation space. The insulating seat 43 includes a seat body 431 having a first air hole 4311 and a second air hole 4312, and a plurality of first insulating grids 432 and a plurality of second insulating grids 433 fixedly connected to the seat body 431. The first insulating grids 432 and the second insulating grids 433 are alternately arranged along the stacking direction of the metal grids 42, and respectively extend backwards from the middle of the seat body 431, that is, forming a staggered shape. The first insulating grids 432 and the second insulating grids 433 are both located in the arc-drawing groove 44 and abut against the metal grid 42 and one of the two support plates 41; the first air hole 4311 is located between two adjacent first insulating grids 432, the second air hole 4312 is located between two adjacent second insulating grids 433, and the first air hole 4311 and the second air hole 4312 are respectively connected to the arc-drawing groove 44.

[0055] In the above embodiment, the first insulating grid 432 and the second insulating grid 433 are fixed by the base 431. During assembly, all the insulating grids can be in contact with all the metal grids 42 at the same time, and the assembly efficiency is high. The first insulating grid 432 and the second insulating grid 433 can also limit the shaking of the edge of the metal grid 42, so that the width of the arc-drawing groove 44 is relatively fixed, thereby ensuring the stability of arc extinguishing, which is beneficial to preventing the arc from breaking through the metal grid 42. The first insulating grid 432 and the second insulating grid 433 extend backward from the middle of the base 431, so that the first air holes 4311 and the second air holes 4312 are staggered. Even if the arc overflows from two adjacent arc-drawing grooves 44, it is difficult to gather and reignite. The first insulating grid 432 and the second insulating grid 433 do not interfere with each other. At the same time, on the basis of the insulating grid being provided in each arc-drawing groove 44, the distance between the two adjacent first insulating grids 432 or the two adjacent second insulating grids 433 is increased, thereby enhancing the cooling effect on the arc.

[0056] Preferably, in one embodiment, the extension direction of the first insulating grid 432 and the second insulating grid 433 are perpendicular to the stacking direction of the metal grids 42. In this way, the structure is neat, the insulating seat 43 and the plurality of metal grids 42 are assembled quickly, the metal grids 42 are not easily damaged, and the batch processing of the insulating seat 43 is also convenient.

[0057] Furthermore, in the above embodiment, the first insulating grid 432 has a first guiding slope 4321, which is located at one end of the first insulating grid 432 close to the middle of the seat body 431, and the first guiding slope 4321 gradually approaches the support plate 41 in a direction away from the seat body 431. In this way, the airflow in the arc groove 44 can be guided to flow toward the first air hole 4311 and the second air hole 4312, thereby preventing the arc from reigniting in the arc extinguishing chamber due to the backflow of the airflow, and improving the arc extinguishing efficiency.

[0058] See also Figure 6 , Figure 6 for Figure 4 Schematic diagram of the structure of the metal plate 421 and the support plate 41. The metal grid 42 includes the metal plate 421, the first mounting feet 422 and the second mounting feet 423 located at two opposite ends of the metal plate 421, and the support plate 41 is provided with a first clamping groove 411 and a second clamping groove 412 corresponding to the first mounting feet 422 and the second mounting feet 423. This makes it convenient to replace the metal grid 42, reduces maintenance costs, and avoids material waste.

[0059] Furthermore, the distances between the first mounting foot 422 and the second mounting foot 423 and the insulating seat 43 are different, and the first mounting foot 422 located at one of the metal grids 42 and the second mounting foot 423 located at the other metal grid 42 of two adjacent metal grids 42 are respectively connected to the support plate 41 on the same side. The metal grids 42 are arranged in a staggered manner, and the first card slots 411 and the second card slots 412 corresponding to the two mounting feet of the metal grids 42 are also arranged in a staggered manner, which is conducive to preventing the local slots on the support plate 41 from being too concentrated, and structurally increasing the overall rigidity of the arc extinguishing chamber structure 40.

[0060] Furthermore, the metal grid 42 is provided with a guide groove 424, which is located on a side of the metal grid 42 away from the base 431, and the width of the guide groove 424 gradually decreases in the direction toward the base 431. After entering the guide groove 424, the airflow can quickly flow toward the first air hole 4311 and the second air hole 4312 without backflow, which is conducive to improving the efficiency of air blowing arc extinguishing.

[0061] In particular, the guide groove 424 gradually deflects toward the side close to the first mounting foot 422 in the direction toward the seat body 431. Under the premise that two adjacent metal grids 42 are arranged in a staggered manner, the airflow flows toward the arc-drawing groove 44 and is guided by the guide groove toward the first mounting foot 422, that is, toward the two sides of the arc-extinguishing chamber, so that the airflow flows out from the first air hole 4311 and the second air hole 4312 more smoothly, and is not easily contacted with re-ignition after flowing out.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An arc extinguishing chamber structure, characterized in that: include: Two support plates (41), the two support plates (41) being arranged opposite to each other and spaced apart to form an installation space; a plurality of metal grids (42), the metal grids (42) being accommodated in the installation space, the two ends of the metal grids (42) being respectively fixedly connected to the two support plates (41), and the plurality of metal grids (42) being stacked to form a plurality of arc-drawing grooves (44); and An insulating seat (43), the insulating seat (43) being located in the installation space, the insulating seat (43) comprising a seat body (431) having a first air vent (4311) and a second air vent (4312), and a plurality of first insulating grids (432) and a plurality of second insulating grids (433) fixedly connected to the seat body (431), the first insulating grids (432) and the second insulating grids (433) being arranged alternately along the stacking direction of the metal grids (42), and respectively extending in a reverse direction from the middle of the seat body (431); The first insulating grid (432) and the second insulating grid (433) are both located in the arc-drawing groove (44) and abut against the metal grid (42) and one of the two support plates (41); the first air vent (4311) is located between two adjacent first insulating grids (432); the second air vent (4312) is located between two adjacent second insulating grids (433); the first air vent (4311) and the second air vent (4312) are respectively connected to the arc-drawing groove (44).

2. An arc extinguishing chamber structure according to claim 1, characterized in that: The extension directions of the first insulating grid plate (432) and the second insulating grid plate (433) are both perpendicular to the stacking direction of the metal grid plate (42).

3. The arc extinguishing chamber structure according to claim 1, characterized in that: The first insulating grid (432) has a first guiding slope (4321), the first guiding slope (4321) is located at one end of the first insulating grid (432) close to the middle of the base (431), and the first guiding slope (4321) gradually approaches the support plate (41) along a direction away from the base (431); and / or The second insulating grid (433) has a second guiding slope (4331), and the second guiding slope (4331) is located at one end of the second insulating grid (433) close to the middle of the base (431), and the second guiding slope (4331) gradually approaches the support plate (41) along a direction away from the base (431).

4. An arc extinguishing chamber structure according to any one of claims 1 to 3, characterized in that: The metal grid (42) comprises a metal plate (421), a first mounting foot (422) and a second mounting foot (423) located at two opposite ends of the metal plate (421), and the support plate (41) is provided with a first card slot (411) and a second card slot (412) corresponding to the first mounting foot (422) and the second mounting foot (423), respectively.

5. An arc extinguishing chamber structure according to claim 4, characterized in that: The first mounting foot (422) and the second mounting foot (423) are at different distances from the insulating seat (43); in two adjacent metal grids (42), the first mounting foot (422) located on one of the metal grids (42) and the second mounting foot (423) located on the other of the metal grids (42) are respectively connected to the support plate (41) on the same side.

6. The arc extinguishing chamber structure according to claim 5, characterized in that: The metal grid (42) is provided with a guide groove (424), the guide groove (424) is located on a side of the metal grid (42) away from the seat body (431), and the width of the guide groove (424) gradually decreases in a direction toward the seat body (431).

7. An arc extinguishing chamber structure according to claim 6, characterized in that: The guide groove (424) gradually deflects toward a side close to the first mounting foot (422) in a direction toward the seat body (431).

8. A circuit breaker, characterized in that: The invention comprises a housing (10), a cover (21), a plurality of metal meshes (22), a stationary contact (31), a moving contact (32) and an arc extinguishing chamber structure (40) according to any one of claims 1 to 7, wherein the housing (10) is provided with an air outlet (12), the cover (21) and the arc extinguishing chamber structure (40) are both located in the housing (10), the cover (21) and the insulating seat (43) are arranged at intervals, and the cover (21) is provided with a mounting opening (211) which is in communication with the air outlet (12), the first air vent (4311) and the second air vent (4312), and the plurality of metal meshes (22) are located at the mounting opening (211) and are fixedly connected to the cover (21); The stationary contact (31) is fixedly connected to the housing (10) and abuts against the arc extinguishing chamber structure (40), and the moving contact (32) is located on a side of the arc extinguishing chamber structure (40) away from the gas outlet (12) and is movably connected to the housing (10).

9. A circuit breaker according to claim 8, characterized in that: The outer wall of the housing (10) is recessed near the stationary contact (31) to form a socket groove (11).

10. A circuit breaker according to claim 9, characterized in that: The cover (21) comprises an outer frame (212) and two partition plates (213) fixedly connected to the outer frame (212); the outer frame (212) is provided with a clearance groove (2133) adapted to the socket groove (11); the partition plate (213) comprises a mounting portion (2131) and a guide portion (2132) extending from the mounting portion (2131) toward the insulating seat (43); the guide portion (2132) extends toward the static contact (31) along the extending direction and abuts against the insulating seat (43).

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