Arc extinguishing structure of circuit breaker and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and particularly discloses an arc extinguishing structure of a circuit breaker and the circuit breaker. According to the arc extinguishing structure of the circuit breaker provided by the utility model, the buffer chamber and the arc extinguishing assembly are arranged in the shell, the exhaust channel is arranged between the arc extinguishing assembly and the buffer chamber, the exhaust channel is communicated with the exhaust port of the arc extinguishing assembly and the buffer chamber, and hot air in the arc extinguishing assembly is guided into the buffer chamber through the exhaust channel. The exhaust channel plays a role in guiding the flowing direction of the hot air flow; the exhaust channel is inclined from the exhaust port to the buffer chamber, so that hot air in the buffer chamber is effectively prevented from reversely flowing back to the contact system, the risk of arc reignition is reduced, the contact and other structures in the circuit breaker cannot be burnt, the breaking performance of the circuit breaker is improved, and the service life of the circuit breaker is prolonged.

Description

Technical Field

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

[0002] During the process of contact breaking of the circuit breaker, the air medium is broken down to generate high-temperature and charged gas, which is called arc. After the arc passes through the arc extinguishing chamber, hot air flow will be generated in the arc extinguishing chamber. The hot air flow will be reflected by the rear wall of the arc extinguishing chamber. Under the action of the reflected air flow, thermal breakdown occurs in the arc running channel and the contact area to generate new arcs, and even the phenomenon of breakdown behind the arc may occur. The contacts and other structures inside the circuit breaker will be continuously burned out, the breaking performance of the circuit breaker is poor, and the service life of the circuit breaker is shortened. Summary of the Invention

[0003] The purpose of the utility model is to provide an arc extinguishing structure of a circuit breaker and a circuit breaker, in which the hot air flow generated by arc extinguishing is guided to the buffer chamber, and the hot air flow in the buffer chamber will not flow back in the reverse direction, reducing the risk of arc reignition, not burning out the internal structure of the circuit breaker, and improving the breaking performance and service life of the circuit breaker.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] In a first aspect, an arc extinguishing structure of a circuit breaker is provided, including:

[0006] A housing, in which a buffer chamber is provided;

[0007] An arc extinguishing component, arranged in the housing, the arc extinguishing component has an exhaust port, and an exhaust channel is provided between the exhaust port and the buffer chamber. The exhaust channel communicates the exhaust port and the buffer chamber, and the exhaust channel is inclined from the exhaust port to the buffer chamber.

[0008] As an optional technical solution of the arc extinguishing structure of the circuit breaker, there are multiple exhaust ports, and the multiple exhaust ports are arranged at intervals along a first direction. There are multiple exhaust channels, and each exhaust channel corresponds to at least one of the exhaust ports.

[0009] As an optional technical solution of the arc extinguishing structure of the circuit breaker, the exhaust channel includes a first exhaust channel and a second exhaust channel. The first exhaust channel and the second exhaust channel are arranged along the first direction, and the first exhaust channel and the second exhaust channel are arranged in a staggered manner in a second direction. The first exhaust channel communicates the exhaust port and the buffer chamber, and the second exhaust channel communicates the exhaust port and the buffer chamber.

[0010] As an alternative technical solution for the arc extinguishing structure of the above circuit breaker, a plurality of first exhaust grids and a plurality of second exhaust grids are provided inside the housing. The plurality of first exhaust grids and the plurality of second exhaust grids are respectively arranged at intervals along a first direction. The first exhaust grids and the second exhaust grids are oppositely arranged in a second direction. The second exhaust grid is inserted between two adjacent first exhaust grids, and a first exhaust channel is formed between the second exhaust grid and the two first exhaust grids. The first exhaust grid is inserted between two adjacent second exhaust grids, and a second exhaust channel is formed between the first exhaust grid and the two second exhaust grids.

[0011] As an alternative technical solution for the arc extinguishing structure of the above circuit breaker, the housing includes a base and a side cover. The first exhaust grid is arranged on the base, the second exhaust grid is arranged on the side cover, and the side cover is buckled on the base.

[0012] As an alternative technical solution for the arc extinguishing structure of the above circuit breaker, a through hole is provided at the bottom of the housing in the first direction. The through hole is communicated with the buffer chamber, and the exhaust channel is inclined towards the bottom of the housing.

[0013] As an alternative technical solution for the arc extinguishing structure of the above circuit breaker, the arc extinguishing assembly includes a plurality of arc extinguishing grids. The plurality of arc extinguishing grids are arranged at intervals along the first direction. At least one positioning grid group is respectively provided on two opposite sides of the housing in the second direction. Each positioning grid group includes a plurality of positioning grids arranged at intervals along the first direction. The positioning grids are inserted between two adjacent arc extinguishing grids.

[0014] As an alternative technical solution for the arc extinguishing structure of the above circuit breaker, a plurality of the positioning grid groups are respectively provided on two opposite sides of the housing in the second direction, and the positioning grid groups arranged on both sides of the housing are arranged in one-to-one correspondence.

[0015] As an alternative technical solution for the arc extinguishing structure of the above circuit breaker, support members are provided on both side walls of the housing opposite to each other in the second direction. The arc extinguishing assembly is clamped between the support members, and a reserved air cavity is formed between the arc extinguishing assembly and the inner side wall of the housing by the support members.

[0016] As an alternative technical solution for the arc extinguishing structure of the above circuit breaker, the support member includes a plurality of first support ribs arranged at intervals, and the first support ribs press against the arc extinguishing assembly.

[0017] In a second aspect, a circuit breaker is provided, including the arc extinguishing structure of the circuit breaker described in any one of the above.

[0018] Advantages of the present utility model:

[0019] The arc extinguishing structure of the circuit breaker provided by the present utility model has a buffer chamber and an arc extinguishing component inside the housing. An exhaust passage is provided between the arc extinguishing component and the buffer chamber. The exhaust passage communicates the exhaust port of the arc extinguishing component and the buffer chamber. The hot air flow inside the arc extinguishing component is guided into the buffer chamber through the exhaust passage, and the exhaust passage plays a role in guiding the flow direction of the hot air flow; the exhaust passage is inclined from the exhaust port to the buffer chamber, effectively preventing the hot air flow in the buffer chamber from flowing back reversely to the contact system, reducing the risk of arc reignition, not burning the contacts and other structures inside the circuit breaker, and improving the breaking performance and service life of the circuit breaker. Description of the drawings

[0020] Figure 1 is a schematic structural diagram of the circuit breaker provided by the embodiment of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the arc extinguishing component installed on the base provided by the embodiment of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the arc extinguishing component provided by the embodiment of the present utility model;

[0023] Figure 4 is a schematic structural diagram of the cooperation between the first exhaust grid and the second exhaust grid provided by the embodiment of the present utility model;

[0024] Figure 5 is a three-dimensional structural diagram of the cooperation between the first exhaust grid and the second exhaust grid provided by the embodiment of the present utility model;

[0025] Figure 6 is a schematic plan view of the base provided by the embodiment of the present utility model;

[0026] Figure 7 is an axonometric view of the base provided by the embodiment of the present utility model;

[0027] Figure 8 is a schematic plan view of the side cover provided by the embodiment of the present utility model;

[0028] Figure 9 is an axonometric view of the side cover provided by the embodiment of the present utility model.

[0029] In the figure:

[0030] 100, contact system; 200, electromagnetic system; 300, arcing path; 400, magnetic conductive plate;

[0031] 1. Outer shell; 2. Arc extinguishing component; 3. Exhaust passage; 4. First exhaust grid; 5. Second exhaust grid; 6. Positioning grid group; 7. Support member; 8. Reserved air cavity;

[0032] 11. Buffer chamber; 111. First cavity; 112. Second cavity; 12. Base; 13. Side cover; 14. Positioning baffle;

[0033] 21. Exhaust port; 22. Arc extinguishing grid; 23. Fixed clamping plate;

[0034] 31. First exhaust passage; 32. Second exhaust passage;

[0035] 61. Positioning grid;

[0036] 71. First support rib; 72. Second support rib. Detailed implementation mode

[0037] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0038] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0040] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] As Figure 1 and Figure 2 shown, this embodiment provides a circuit breaker. The circuit breaker includes a contact system 100, an electromagnetic system 200, an arc runner 300, a magnetic conductive plate 400, and an arc extinguishing structure of the circuit breaker. The arc extinguishing structure of the circuit breaker includes a housing 1 and an arc extinguishing component 2. The arc extinguishing component 2, the contact system 100, the electromagnetic system 200, the arc runner 300, and the magnetic conductive plate 400 are all arranged inside the housing 1. When the circuit breaker is short-circuited, the arc generated by the breaking of the contact system 100 enters the arc extinguishing component 2 through the magnetic yoke of the electromagnetic system 200 and the arc runner 300. The housing 1 is a high-temperature resistant gas-producing material, which can form air pressure inside the circuit breaker and play a role in blowing arc extinguishing. The electromagnetic system 200, the arc runner 300, and the magnetic conductive plate 400 strengthen the magnetic field of the circuit breaker and play a role in magnetic blow arc extinguishing.

[0042] A buffer chamber 11 is provided inside the housing 1. The arc extinguishing component 2 has an exhaust port 21. An exhaust passage 3 is provided between the exhaust port 21 and the buffer chamber 11. The exhaust passage 3 communicates the exhaust port 21 and the buffer chamber 11, and the exhaust passage 3 is inclined from the exhaust port 21 to the buffer chamber 11. The hot air flow inside the arc extinguishing component 2 is guided into the buffer chamber 11 through the exhaust passage 3. The exhaust passage 3 plays a role in guiding the flow direction of the hot air flow; the exhaust passage 3 is inclined from the exhaust port 21 to the buffer chamber 11, effectively preventing the hot air flow in the buffer chamber 11 from flowing back to the contact system 100 in the reverse direction, reducing the risk of arc reignition, not burning the contacts and other structures inside the circuit breaker, and improving the breaking performance and service life of the circuit breaker.

[0043] As Figure 3 shown, the arc extinguishing component 2 includes a plurality of arc extinguishing grid plates 22 and a fixed clamping plate 23 connecting the plurality of arc extinguishing grid plates 22. The plurality of arc extinguishing grid plates 22 are arranged at intervals in sequence. One end of two adjacent arc extinguishing grid plates 22 forms the exhaust port 21, and the hot air flow placed between the two arc extinguishing grid plates 22 is discharged through the exhaust port 21.

[0044] Combined with Figure 2 and Figure 3As shown, the arc extinguishing component 2 is provided with a plurality of exhaust ports 21, and the plurality of exhaust ports 21 are arranged at intervals in the first direction. There are a plurality of exhaust channels 3, and each exhaust channel 3 corresponds to at least one exhaust port 21 respectively, that is, the plurality of exhaust channels 3 are arranged in the first direction. The arrangement of the plurality of exhaust channels 3 plays a role in shunting, improving the exhaust efficiency, and at the same time also increasing the cooling speed of the hot air flow. Optionally, one exhaust channel 3 is correspondingly arranged for each exhaust port 21.

[0045] The buffer chamber 11 is used to cool the arc to discharge the hot air flow. When the circuit breaker is tripped, an arc is formed in the contact system 100, the housing 1 generates gas to increase the pressure, and the buffer chamber 11 exhausts and decompresses, so that a pressure difference is formed inside the circuit breaker, which is beneficial to accelerating the movement of the arc to the arc extinguishing component 2 for arc extinguishing.

[0046] In some embodiments, the bottom of the housing 1 in the first direction is provided with a through hole, the through hole is communicated with the buffer chamber 11, the exhaust channel 3 is inclined towards the bottom of the housing 1, so that the hot air flow entering the buffer chamber 11 can be quickly discharged to the outside of the housing 1 through the through hole, and the inclined arrangement of the exhaust channel 3 can effectively prevent the hot air flow in the buffer chamber 11 from flowing back to the contact system 100 in the reverse direction. Optionally, the buffer chamber 11 includes a first cavity 111 and a second cavity 112. The first cavity 111 is arranged at the lower part inside the housing 1, the through hole is communicated with the first cavity 111, there are a plurality of exhaust channels 3, and the plurality of exhaust channels 3 are arranged in the first direction. The second cavity 112 extends in the first direction inside the housing 1, the second cavity 112 is communicated with the first cavity 111, the exhaust channel 3 is communicated with the second cavity 112, and the hot air flow discharged from the arc extinguishing component 2 through the exhaust port 21 can pass through the exhaust channel 3, enter the second cavity 112, and then enter the first cavity 111.

[0047] In other embodiments, the bottom of the housing 1 in the first direction is provided with a through hole, the through hole is communicated with the buffer chamber 11, the exhaust channel 3 is inclined towards the top of the housing 1, and the inclined arrangement of the exhaust channel 3 can effectively prevent the hot air flow in the buffer chamber 11 from flowing back to the contact system 100 in the reverse direction. Optionally, the buffer chamber 11 includes a first cavity 111 and a second cavity 112. The first cavity 111 is arranged at the lower part inside the housing 1, the through hole is communicated with the first cavity 111, there are a plurality of exhaust channels 3, and the plurality of exhaust channels 3 are arranged in the first direction. The second cavity 112 extends in the first direction inside the housing 1, the second cavity 112 is communicated with the first cavity 111, the exhaust channel 3 is communicated with the second cavity 112, and the hot air flow discharged from the arc extinguishing component 2 through the exhaust port 21 can pass through the exhaust channel 3, enter the second cavity 112, and then enter the first cavity 111.

[0048] Combined Figure 2 、 Figure 4 and Figure 5As shown, in some embodiments, the exhaust passage 3 includes a first exhaust passage 31 and a second exhaust passage 32. The first exhaust passage 31 and the second exhaust passage 32 are arranged along a first direction, and the first exhaust passage 31 and the second exhaust passage 32 are offset in a second direction. The first exhaust passage 31 communicates with the exhaust port 21 and the buffer chamber 11, and the second exhaust passage 32 communicates with the exhaust port 21 and the buffer chamber 11. The offset arrangement of the first exhaust passage 31 and the second exhaust passage 32 can play a role in extinguishing the arc and cooling the hot air flow. If one exhaust passage 3 corresponds to one exhaust port 21, then the first exhaust passage 31 and the second exhaust passage 32 communicate with the same exhaust port 21, which plays a role in diverting the hot air flow and improving the cooling speed of the hot air flow. If one exhaust passage 3 corresponds to multiple exhaust ports 21, the first exhaust passage 31 communicates with one or more exhaust ports 21, and the second exhaust passage 32 communicates with one or more exhaust ports 21. The specific setting method is not specifically limited herein.

[0049] Further optionally, a plurality of first exhaust grids 4 and a plurality of second exhaust grids 5 are provided in the housing 1. The plurality of first exhaust grids 4 and the plurality of second exhaust grids 5 are respectively arranged at intervals along the first direction. The first exhaust grid 4 and the second exhaust grid 5 are oppositely arranged in the second direction. The second exhaust grid 5 is inserted between two adjacent first exhaust grids 4, and a first exhaust passage 31 is formed between the second exhaust grid 5 and the two first exhaust grids 4. The first exhaust grid 4 is inserted between two adjacent second exhaust grids 5, and a second exhaust passage 32 is formed between the first exhaust grid 4 and the two second exhaust grids 5. The structure is simple, and the first exhaust passage 31 and the second exhaust passage 32 with an offset arrangement can be formed.

[0050] As Figure 4 and Figures 6 to 9 As shown, the housing 1 includes a base 12 and a side cover 13. The first exhaust grid 4 is arranged on the base 12, and the second exhaust grid 5 is arranged on the side cover 13. The side cover 13 is buckled on the base 12. The first exhaust grid 4 is inserted between two adjacent second exhaust grids 5, and the second exhaust grid 5 is inserted between two adjacent first exhaust grids 4. When assembling the base 12 and the side cover 13, the first exhaust grid 4 and the second exhaust grid 5 are inserted into each other to form the first exhaust passage 31 and the second exhaust passage 32, which is convenient for assembly.

[0051] It should be further explained that both the first exhaust grid 4 and the second exhaust grid 5 are inclined. When the base 12 and the side cover 13 are buckled together, the inclined directions of the first exhaust grid 4 and the second exhaust grid 5 are the same to form the inclined first exhaust passage 31 and the second exhaust passage 32.

[0052] In some other embodiments, the housing 1 includes a base 12 and a side cover 13. One of the base 12 and the side cover 13 is provided with a plurality of third exhaust grids which are arranged at intervals in the first direction. After the base 12 and the side cover 13 are fastened and connected, the third exhaust grids abut against the other one of the base 12 and the side cover 13 to form an exhaust passage 3.

[0053] As Figure 2 and Figures 6 to 9 As shown, in some embodiments, when the arc extinguishing component 2 is installed in the housing 1, a plurality of arc extinguishing grids 22 of the arc extinguishing component 2 are arranged at intervals in the first direction. Positioning grid groups 6 are respectively provided on two opposite sides of the housing 1 in the second direction. Each positioning grid group 6 includes a plurality of positioning grids 61 which are arranged at intervals in the first direction. The positioning grids 61 are inserted between two adjacent arc extinguishing grids 22. When the arc extinguishing component 2 is installed in the housing 1, the positioning grids 61 are inserted between two arc extinguishing grids 22 to realize the positioning and support of the arc extinguishing grids 22, avoid the scattering of a plurality of arc extinguishing grids 22 caused by the burning of the fixing clamp plate 23 for fixing the arc extinguishing grids 22, and improve the reliability of the circuit breaker during use.

[0054] Optionally, a plurality of positioning grid groups 6 are respectively provided on two opposite sides of the housing 1 in the second direction, and the positioning grid groups 6 on both sides of the housing 1 are arranged in one-to-one correspondence, providing multiple support points for positioning the arc extinguishing grids 22, avoiding the inclination of a plurality of arc extinguishing grids 22 when the fixing clamp plate 23 is burned, and playing a role in stably supporting the arc extinguishing grids 22. Exemplarily, two positioning grid groups 6 are respectively provided on two opposite sides of the housing 1 in the second direction. The arc extinguishing grids 22 are of a rectangular structure, and the four positioning grid groups 6 are arranged at the four corners of the arc extinguishing grids 22, providing effective support for the arc extinguishing grids 22.

[0055] Positioning grid groups 6 are provided at corresponding positions on the inner sides of the base 12 and the side cover 13. The arc extinguishing component 2 can be first placed in the base 12, so that the positioning grids 61 on the base 12 are inserted between two arc extinguishing grids 22, and then the side cover 13 is fastened to the base 12. At the same time, the positioning grids 61 on the side cover 13 are inserted between two arc extinguishing grids 22, improving the assembly efficiency of the circuit breaker and being convenient for operation.

[0056] Continuing to refer to Figure 2 and Figures 6 to 9 As shown, in some embodiments, support members 7 are provided on two opposite side walls of the housing 1 in the second direction. The arc extinguishing component 2 is clamped between the support members 7, and the support members 7 form a reserved air cavity 8 between the arc extinguishing component 2 and the inner side wall of the housing 1. The arc extinguishing component 2 is not in direct contact with the housing 1, which is beneficial to the heat dissipation of the arc extinguishing component 2 and avoids burning the housing 1.

[0057] Optionally, the support member 7 includes a plurality of first support ribs 71 arranged at intervals. The first support ribs 71 are pressed against the arc extinguishing assembly 2. A reserved air cavity 8 is formed between the first support ribs 71, the housing 1 and the arc extinguishing assembly 2, and the structure is simple. The first support ribs 71 and the housing 1 are of an integral connection structure.

[0058] Further optionally, the support member 7 includes two first support ribs 71 arranged at intervals. One end of the two first support ribs 71 is connected with a second support rib 72, and the second support rib 72 is also pressed against the arc extinguishing assembly 2. A positioning baffle 14 is provided at the other end of the two first support ribs 71. The positioning baffle 14 is higher than the first support ribs 71 and plays a role in positioning the installation of the arc extinguishing assembly 2. A reserved air cavity 8 is formed among the positioning baffle 14, the first support ribs 71, the second support rib 72, the housing 1 and the arc extinguishing assembly 2.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. The arc extinguishing structure of the circuit breaker is characterized by: include: A housing (1), wherein a buffer chamber (11) is provided in the housing (1); An arc extinguishing assembly (2) is arranged in the housing (1), the arc extinguishing assembly (2) having an exhaust port (21), an exhaust passage (3) being arranged between the exhaust port (21) and the buffer chamber (11), the exhaust passage (3) being connected to the exhaust port (21) and the buffer chamber (11), and the exhaust passage (3) being arranged obliquely from the exhaust port (21) to the buffer chamber (11).

2. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: A plurality of exhaust ports (21) are provided, and the plurality of exhaust ports (21) are arranged at intervals along a first direction. A plurality of exhaust channels (3) are provided, and each exhaust channel (3) corresponds to at least one exhaust port (21).

3. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The exhaust channel (3) comprises a first exhaust channel (31) and a second exhaust channel (32), the first exhaust channel (31) and the second exhaust channel (32) are arranged along a first direction, and the first exhaust channel (31) and the second exhaust channel (32) are staggered in a second direction, the first exhaust channel (31) is connected to the exhaust port (21) and the buffer chamber (11), and the second exhaust channel (32) is connected to the exhaust port (21) and the buffer chamber (11).

4. The arc extinguishing structure of the circuit breaker according to claim 3, characterized in that: A plurality of first exhaust grilles (4) and a plurality of second exhaust grilles (5) are arranged in the housing (1); the plurality of first exhaust grilles (4) and the plurality of second exhaust grilles (5) are arranged at intervals along a first direction; the first exhaust grilles (4) and the second exhaust grilles (5) are arranged opposite to each other in a second direction; the second exhaust grille (5) is inserted between two adjacent first exhaust grilles (4), and a first exhaust channel (31) is formed between the second exhaust grille (5) and the two first exhaust grilles (4); the first exhaust grille (4) is inserted between two adjacent second exhaust grilles (5), and a second exhaust channel (32) is formed between the first exhaust grille (4) and the two second exhaust grilles (5).

5. The arc extinguishing structure of the circuit breaker according to claim 4, characterized in that: The housing (1) comprises a base (12) and a side cover (13); the first exhaust grille (4) is arranged on the base (12); the second exhaust grille (5) is arranged on the side cover (13); and the side cover (13) is buckled onto the base (12).

6. The arc extinguishing structure of a circuit breaker according to any one of claims 1 to 5, characterized in that: A through hole is provided at the bottom of the housing (1) in the first direction, the through hole being in communication with the buffer chamber (11), and the exhaust passage (3) is arranged inclined toward the bottom of the housing (1).

7. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The arc extinguishing assembly (2) comprises a plurality of arc extinguishing grids (22), the plurality of arc extinguishing grids (22) being arranged at intervals along a first direction, at least one positioning grid group (6) being provided on two opposite sides in a second direction in the housing (1), each positioning grid group (6) comprising a plurality of positioning grids (61) arranged at intervals along the first direction, the positioning grids (61) being inserted between two adjacent arc extinguishing grids (22).

8. The arc extinguishing structure of the circuit breaker according to claim 7, characterized in that: A plurality of positioning grid groups (6) are respectively arranged on two opposite sides of the shell (1) in the second direction, and the positioning grid groups (6) arranged on the two sides of the shell (1) are arranged in a one-to-one correspondence.

9. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: Support members (7) are provided on two side walls opposite to each other in the second direction in the housing (1); the arc extinguishing assembly (2) is sandwiched between the support members (7); and the support members (7) form a reserved air cavity (8) between the arc extinguishing assembly (2) and the inner side wall of the housing (1).

10. The arc extinguishing structure of the circuit breaker according to claim 9, characterized in that: The support member (7) comprises a plurality of first support ribs (71) arranged at intervals, wherein the first support ribs (71) are pressed against the arc extinguishing assembly (2).

11. A circuit breaker, characterized in that The invention comprises the arc extinguishing structure of the circuit breaker according to any one of claims 1 to 10.

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