Arc extinguishing structure and circuit breaker

Abstract

The utility model provides an arc extinguishing structure and a circuit breaker, and relates to the technical field of electrical equipment. The arc extinguishing structure comprises a housing and a plurality of grid sheets. The shell is provided with an arc extinguishing part and an exhaust channel; the plurality of grid plates are all arranged on the arc extinguishing part, two adjacent grid plates form an arc extinguishing channel, the arc extinguishing channel is communicated with the exhaust channel, and one ends, adjacent to the exhaust channel, of the plurality of grid plates are distributed in a stepped manner, so that a relatively large number of grid plates can be placed in a narrow space in the shell as much as possible, and a relatively small mounting space of the shell can be adapted; the exhaust channel is arranged between the end parts of the plurality of grid sheets and the bottom wall of the shell, so that electric arcs and high-temperature gas flow along the arc extinguishing channel after entering the arc extinguishing channel, and are discharged into the exhaust channel communicated with the arc extinguishing channel in time, and finally, the electric arcs and the high-temperature gas are discharged from the exhaust channel; and one ends, close to the moving contact, of the plurality of grid sheets are distributed in a high-low staggered manner, so that a narrow mounting space in the shell is further adapted, and the adaptability of the arc extinguishing structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field, specifically, relate to an arc extinguishing structure and circuit breaker. BACKGROUND

[0002] In the electrical equipment related field, the switch will produce arc in the process of closing and opening of the moving contact and the static contact, and the arc will cause the contact surface to melt and evaporate, which will seriously affect the contact performance of the contact in the long run, thus shortening the service life of the equipment.

[0003] However, the volume of the conventional electrical product is small, and the space reserved for the arc extinguishing system in the product is also too small, the structure design of the arc extinguishing system is unreasonable, the arc is discharged at a slow speed in the arc extinguishing system, and the arc extinguishing effect cannot meet the requirements. SUMMARY

[0004] The utility model discloses a kind of arc extinguishing structure and circuit breaker, its arc extinguishing structure is simple and set reasonably, can effectively extinguish arc.

[0005] The embodiment of the utility model is implemented as follows:

[0006] In the first aspect, the utility model provides an arc extinguishing structure, comprising:

[0007] The shell is provided with an arc extinguishing part and an exhaust passage;

[0008] A plurality of louvers are arranged in the arc extinguishing part, and adjacent two louvers form an arc extinguishing passage.

[0009] In an optional embodiment, the bottom wall of the shell is on a reference plane, at least two louvers form a louver group, the number of louver groups is multiple, and the distance between the multiple louver groups and the reference plane gradually increases along the length direction of the shell to form a stepped distribution.

[0010] In an optional embodiment, the bottom wall of the shell is on a reference plane, and the distance between the multiple louvers and the reference plane gradually increases along the length direction of the shell to form a stepped distribution.

[0011] In an optional embodiment, the number of exhaust passages is multiple, and one exhaust passage is communicated with at least one arc extinguishing passage.

[0012] In an optional embodiment, the shell is provided with a first isolation part parallel to the reference plane.

[0013] The plurality of grid groups comprises a first grid group, the first grid group is closest to the reference plane, and the first isolation portion and the first grid group form the first exhaust channel.

[0014] In an optional embodiment, the shell is provided with a second isolation portion.

[0015] The plurality of grid groups further comprises a second grid group adjacent to the first grid group, the second isolation portion and the second grid group form the second exhaust channel, the first isolation portion and the bottom wall of the shell form a converging channel, and the second exhaust channel communicates with the converging channel.

[0016] In an optional embodiment, the shell is provided with a third isolation portion and a fourth isolation portion, the third isolation portion is arranged between the second isolation portion and the bottom wall of the shell, the third isolation portion and the second isolation portion form the third exhaust channel, the third isolation portion and the bottom wall of the shell form the fourth exhaust channel, and the fourth isolation portion and the bottom wall of the shell form a fifth exhaust channel.

[0017] The fourth isolation portion is provided with a first air guide groove, the plurality of grid groups further comprises a third grid group adjacent to the second grid group, one end of the first air guide groove communicates with the arc extinguishing channel of the third grid group, and the other end communicates with the fifth exhaust channel, one end of the third exhaust channel and the fourth exhaust channel collectively communicates with the fifth exhaust channel, and the other end collectively communicates with the converging channel.

[0018] In an optional embodiment, the fourth isolation portion is provided with a second air guide groove, the plurality of grid groups further comprises a fourth grid group adjacent to the third grid group, one end of the second air guide groove communicates with the arc extinguishing channel of the fourth grid group, and the other end communicates with the fifth exhaust channel.

[0019] In a second aspect, the utility model provides a circuit breaker, including movable contact and as preceding any one described in the arc extinguishing structure, movable contact is movably arranged in the shell, and at least part of movable contact is located in the arc extinguishing portion.

[0020] In an optional embodiment, the circuit breaker further comprises a pole terminal, the pole terminal is arranged at the bottom wall of the shell and located at one side of the arc extinguishing portion.

[0021] The arc extinguishing structure and the circuit breaker have the beneficial effects that: the other ends of the plurality of grid plates are distributed in a stepped manner, that is, the end portions of the plurality of grid plates are not on the same horizontal line, so that more grid plates can be placed in the narrow space in the shell as much as possible to adapt to the small installation space of the shell; the exhaust passages are arranged between the end portions of the plurality of grid plates and the bottom wall of the shell, so that the electric arc and the high-temperature gas flow along the arc extinguishing passages after entering the arc extinguishing passages, and are timely discharged into the exhaust passages communicated with the arc extinguishing passages, and finally the electric arc and the high-temperature gas are discharged from the exhaust passages; and the one end of the plurality of grid plates close to the movable contact is distributed in a staggered manner, further adapting to the narrow installation space in the shell to install as many grid plates as possible, so as to improve the adaptability of the arc extinguishing structure. It can be seen that the arc extinguishing structure is simple, the end portions of the plurality of grid plates are reasonably arranged in a stepped manner, and the arc extinguishing passages formed by the grid plates are communicated with the exhaust passages, so that the arc extinguishing structure not only adapts to the small installation space of the shell, but also effectively guides the electric arc and the high-temperature gas, so that the arc extinguishing effect meets the use requirement. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 The circuit breaker structure schematic diagram provided by the embodiments of the present application is shown in Figure 1.

[0024] Figure 2 The circuit breaker structure schematic diagram provided by the embodiments of the present application is shown in Figure 2.

[0025] Figure 3 The circuit breaker structure provided by the embodiments of the present application is shown in Figure 3. Figure 2 The local enlarged view is shown in Figure 4.

[0026] Figure legend: 1-circuit breaker; 10-arc extinguishing structure; 20-movable contact; 30-pole terminal; 100-shell; 110-arc extinguishing part; 120-exhaust passage; 121-first exhaust passage; 122-second exhaust passage; 123-third exhaust passage; 124-fourth exhaust passage; 125-fifth exhaust passage; 126-converging passage; 130-first isolation part; 140-second isolation part; 150-third isolation part; 160-fourth isolation part; 161-first air guide groove; 162-second air guide groove; 200-grid plate; 210-first grid plate group; 220-second grid plate group; 230-third grid plate group; 240-fourth grid plate group; 300-arc extinguishing passage. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships of the product of the present application when it is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", etc. do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term '' set '', '' install '', '' link '', '' connect '' should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two element internal communication.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0033] In the field of electrical equipment, switch will produce arc in the process of closing and opening of moving contact and static contact, and the arc will cause the melting and evaporation of the contact surface, which will seriously affect the contact performance of the contact in the long run, thus shortening the service life of the equipment.

[0034] However, the volume of conventional electrical products is small, and the space reserved for the arc extinguishing system in the product is also too small, the structure of the arc extinguishing system is unreasonable, the arc is discharged slowly in the arc extinguishing system, and the arc extinguishing effect cannot meet the requirements.

[0035] Based on the problems in the prior art, please refer to Figures 1 to 3 The utility model embodiment provides a circuit breaker 1 applied to low-voltage electrical equipment, and the circuit breaker 1 comprises an arc extinguishing structure 10, which is reasonably structured and can effectively extinguish arc.

[0036] In the embodiment, the circuit breaker 1 further comprises a moving contact 20, which is movably arranged in the shell 100, and at least part of the moving contact 20 is located in the arc extinguishing part 110, so that the arc can enter the arc extinguishing part 110.

[0037] Further, the arc extinguishing structure 10 comprises a shell 100 and a plurality of fins 200.

[0038] The shell 100 is provided with an arc extinguishing part 110 and an exhaust passage 120, and the plurality of fins 200 are arranged in the arc extinguishing part 110, adjacent two fins 200 form an arc extinguishing passage 300, the arc extinguishing passage 300 is communicated with the exhaust passage 120, one end of the plurality of fins 200 adjacent to the exhaust passage 120 is in stepped distribution, and the other end of the plurality of fins 200 away from the exhaust passage 120 is in staggered distribution.

[0039] In the embodiment, one end of the plurality of grid pieces 200 corresponds to the moving contact 20, so that the electric arc and high-temperature gas generated when the moving contact 20 and the static contact are in contact and separated can quickly enter the arc extinguishing channel 300; the other end of the plurality of grid pieces 200 is distributed in a stepped manner, that is, the end of the plurality of grid pieces 200 is not on the same horizontal line, so that more grid pieces 200 can be placed in the narrow space in the shell 100, thereby adapting to the small installation space of the shell 100; the exhaust channel 120 is arranged between the end of the plurality of grid pieces 200 and the bottom wall of the shell 100, so that the electric arc and high-temperature gas flow along the arc extinguishing channel 300 after entering the arc extinguishing channel 300, and are discharged in time to the exhaust channel 120 communicated with the arc extinguishing channel 300, and finally the electric arc and high-temperature gas are discharged from the exhaust channel 120; and the end of the plurality of grid pieces 200 close to the moving contact 20 is distributed in a staggered manner, further adapting to the narrow installation space in the shell 100, so that more grid pieces 200 can be installed, thereby improving the adaptability of the arc extinguishing structure 10.

[0040] Therefore, the arc extinguishing structure 10 provided by the embodiment of the utility model is simple, the ends of the plurality of grid pieces 200 are reasonably arranged in a stepped distribution, and the arc extinguishing channel 300 formed by the grid pieces 200 is communicated with the exhaust channel 120, which not only adapts to the small installation space of the shell 100, but also effectively guides the electric arc and high-temperature gas, so that the arc extinguishing effect meets the use requirement.

[0041] Further, the horizontal plane where the bottom wall of the shell 100 is located is a reference plane (as shown in the figure), at least two grid pieces 200 constitute a grid piece group, the number of the grid piece groups is multiple, and the distance between the multiple grid piece groups and the reference plane gradually increases along the length direction of the shell 100, so as to be distributed in a stepped manner.

[0042] It is worth mentioning that the end of the plurality of grid pieces 200 close to the moving contact 20 is distributed in a staggered manner, that is, the inlet end of the plurality of grid pieces 200 is also arranged in a non-equal height manner relative to the reference plane.

[0043] In the embodiment, as shown in the figure, a plurality of grid piece groups are arranged in the arc extinguishing part 110, and the number of the grid pieces 200 in each grid piece group is at least two, that is, each grid piece group has at least one arc extinguishing channel 300.

[0044] For example, in the direction from left to right, the plane where the bottom wall of the shell 100 is located is a reference plane, the plurality of grid piece groups are arranged in sequence in the direction from left to right, and the distance between the end of the plurality of grid piece groups and the reference plane gradually increases in the direction from left to right, thereby adapting to the limited installation space in the shell 100.

[0045] Of course, not only so, in other embodiments of the utility model, the distance between multiple grid pieces 200 and the reference plane gradually increases along the length direction of the shell 100, to be distributed in a stepped manner.

[0046] Further, the number of exhaust channels 120 is multiple, and one exhaust channel 120 is communicated with at least one arc extinguishing channel 300.

[0047] In the embodiment, by setting multiple exhaust channels 120 and making each exhaust channel 120 communicated with at least one arc extinguishing channel 300, the problem of gas stagnation is reduced, so that the arc and high-temperature gas are effectively transferred through the arc extinguishing channel 300 and the exhaust channel 120, thereby ensuring the arc extinguishing effect.

[0048] In detail, one exhaust channel 120 is correspondingly provided with at least one grid piece group.

[0049] Specifically, as shown in the figure, the number of grid piece groups is 4, of course, in other embodiments of the utility model, the number of grid piece groups can also be other settings, which are not limited here.

[0050] For detailed description, the following describes the embodiment of 4 grid piece groups.

[0051] The multiple grid piece groups include a first grid piece group 210, a second grid piece group 220, a third grid piece group 230 and a fourth grid piece group 240, the first grid piece group 210, the second grid piece group 220, the third grid piece group 230 and the fourth grid piece group 240 are arranged in order along the direction from left to right shown in the figure, and the spacing between the end thereof and the reference plane increases in order, that is, the spacing between the first grid piece group 210 and the reference plane is the smallest, and the spacing between the fourth grid piece group 240 and the reference plane is the largest.

[0052] In addition, it should be noted that the multiple exhaust channels 120 include a first exhaust channel 121, a second exhaust channel 122, a third exhaust channel 123, a fourth exhaust channel 124, a fifth exhaust channel 125 and a merging channel 126, and the shell 100 is provided with a first isolation part 130, a second isolation part 140, a third isolation part 150 and a fourth isolation part 160, which are described in detail below.

[0053] Further, the first isolation part 130 and the first grid piece group 210 form the first exhaust channel 121.

[0054] Therefore, in the embodiment, the arc extinguishing channel 300 of the first grid piece group 210 is communicated with the first exhaust channel 121, and the arc and high-temperature gas are discharged through the first exhaust channel 121 after entering the arc extinguishing channel 300 of the first grid piece group 210.

[0055] In detail, as shown in the figure, the number of the grid fins 200 in the first grid fin group 210 is 4.

[0056] Further, the second grid fin group 220 is adjacent to the first grid fin group 210, the second isolation part 140 and the second grid fin group 220 form the second exhaust channel 122, the first isolation part 130 and the bottom wall of the shell 100 form the convergence channel 126, and the second exhaust channel 122 and the convergence channel 126 are in communication.

[0057] In this embodiment, it should be noted that the second isolation part 140 is arranged at intervals with the first isolation part 130, and the second exhaust channel 122 and the convergence channel 126 are in communication through the gap between the second isolation part 140 and the first isolation part 130, so that the arc and high-temperature gas can be discharged by the convergence channel 126 after entering the arc extinguishing channel 300 of the second grid fin group 220 through the second exhaust channel 122.

[0058] In detail, as shown in the figure, the number of the grid fins 200 in the second grid fin group 220 is 2.

[0059] Further, the third isolation part 150 is arranged between the second isolation part 140 and the bottom wall of the shell 100, the third isolation part 150 and the second isolation part 140 form the third exhaust channel 123, the third isolation part 150 and the bottom wall of the shell 100 form the fourth exhaust channel 124, and the fourth isolation part 160 and the bottom wall of the shell 100 form the fifth exhaust channel 125.

[0060] The fourth isolation part 160 is provided with a first gas guide groove 161, the third grid fin group 230 is adjacent to the second grid fin group 220, one end of the first gas guide groove 161 is in communication with the arc extinguishing channel 300 of the third grid fin group 230, and the other end is in communication with the fifth exhaust channel 125, one end of the third exhaust channel 123 and the fourth exhaust channel 124 is in common communication with the fifth exhaust channel 125, and the other end is in common communication with the convergence channel 126.

[0061] In this embodiment, the arc and high-temperature gas enter the fifth exhaust channel 125 through the first gas guide groove 161 after entering the arc extinguishing channel 300 of the third grid fin group 230, and enter the convergence channel 126 through the third exhaust channel 123 and the fourth exhaust channel 124, and are finally discharged by the convergence channel 126.

[0062] It should be noted that the number of the first gas guide groove 161 is consistent with the number of the arc extinguishing channel 300 of the third grid fin group 230, that is, one gas guide groove is in communication with one arc extinguishing channel 300, so as to ensure that the arc and high-temperature gas of each arc extinguishing channel 300 can enter the fifth exhaust channel 125 through the first gas guide groove 161.

[0063] In detail, as shown in the figure, the number of the vanes 200 in the third vane group 230 is 3.

[0064] Further, the fourth isolation portion 160 is provided with a second air guide groove 162, the fourth vane group 240 is adjacent to the third vane group 230, one end of the second air guide groove 162 is in communication with the arc extinguishing channel 300 of the fourth vane group 240, and the other end is in communication with the fifth exhaust channel 125.

[0065] In this embodiment, the number of the second air guide groove 162 can be multiple, so as to correspond to multiple arc extinguishing channels 300 of the fourth vane group 240 respectively, so that the arc and high-temperature gas enter the fifth exhaust channel 125 through the second air guide groove 162 after entering the arc extinguishing channel 300 of the fourth vane group 240, and then enter the merging channel 126 through the third exhaust channel 123 and the fourth exhaust channel 124, and finally are discharged from the merging channel 126.

[0066] In detail, as shown in the figure, the number of the vanes 200 in the third vane group 230 is 3.

[0067] It should be noted that the second isolation portion 140 includes a first horizontal section, an inclined section and a first vertical section connected in sequence, the third isolation portion 150 is arranged in parallel with the inclined section of the second isolation portion 140, and the bottom wall of the shell 100 also includes a second horizontal section, a second vertical section extending towards the arc extinguishing structure 10 and a third horizontal section connected in sequence, the merging channel 126 is formed between the first isolation portion 130 and the second horizontal section, the fourth exhaust channel 124 is formed between the third isolation portion 150 and the second horizontal section and the second vertical section, and the fifth exhaust channel 125 is formed between the fourth isolation portion 160 and the third horizontal section.

[0068] Therefore, after the arc and high-temperature gas enter the arc extinguishing channels 300 of the first vane group 210, the second vane group 220, the third vane group 230 and the fourth vane group 240, they can be discharged through the corresponding first exhaust channel 121, the second exhaust channel 122, the third exhaust channel 123, the fourth exhaust channel 124 and the fifth exhaust channel 125 respectively, effectively improving the exhaust speed and exhaust efficiency, i.e. through the arrangement of multiple air passages, the problem of gas stagnation at the exhaust end of the arc extinguishing channel 300 is effectively solved.

[0069] Further, the circuit breaker 1 further includes a pole terminal 30, which is arranged at the bottom wall of the shell 100 and located at one side of the arc extinguishing portion 110.

[0070] In this embodiment, with reference to the figure, the pole terminal 30 is arranged at the lower right of the arc extinguishing portion 110.

[0071] In summary, the utility model provides a kind of arc extinguishing structure 10 and circuit breaker 1, one end of multiple louvers 200 corresponds with moving contact 20, to facilitate the arc and high-temperature gas generated when moving contact 20 and static contact are contacted and separated rapidly enter arc extinguishing passage 300;And the other end of multiple louvers 200 is in the form of ladder, i.e. the end of multiple louvers 200 is not on the same horizontal line, to make the narrow space in shell 100 as possible place more quantity of louvers 200, to adapt to the smaller installation space of shell 100;By setting exhaust passage 120 between the end of multiple louvers 200 and the bottom wall of shell 100, so that arc and high-temperature gas flow along arc extinguishing passage 300 after entering arc extinguishing passage 300, and timely exhaust into exhaust passage 120 communicated with arc extinguishing passage 300, finally make arc and high-temperature gas exhaust from exhaust passage 120.It can be seen from this that the arc extinguishing structure 10 provided in the utility model embodiment is simple, by reasonably setting the end of multiple louvers 200 in the form of ladder, and making arc extinguishing passage 300 formed by louver 200 communicate with exhaust passage 120, not only adapt to the smaller installation space of shell 100, but also can effectively guide arc and high-temperature gas, so that arc extinguishing effect reaches use requirement.

[0072] The above is only preferred embodiment of the utility model, and is not used to limit the utility model, for the person skilled in the art, the utility model can have various changes and changes.For any modification, equivalent replacement, improvement, etc., which is within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. An arc extinguishing structure (10) characterized in that, The utility model relates to an arc extinguishing device, comprising: a housing (100) provided with an arc extinguishing part (110) and an exhaust channel (120); a plurality of grid fins (200) each arranged in the arc extinguishing part (110), two adjacent grid fins (200) forming an arc extinguishing channel (300) in communication with the exhaust channel (120), and the plurality of grid fins (200) being distributed in steps at one end adjacent to the exhaust channel (120) and being distributed in staggered steps at the other end away from the exhaust channel (120) and cooperating with an operating mechanism.

2. The quenching structure (10) according to claim 1, characterized in that The bottom wall of the housing (100) is on a reference plane, at least two grid fins (200) form a grid fin (200) group, the number of the grid fin (200) groups is multiple, and the distance between the plurality of grid fin (200) groups and the reference plane gradually increases along the length direction of the housing (100) to be distributed in steps.

3. The quenching structure (10) according to claim 1, characterized in that The bottom wall of the housing (100) is on a reference plane, and the distance between the plurality of grid fins (200) and the reference plane gradually increases along the length direction of the housing (100) to be distributed in steps.

4. The quenching structure (10) according to any one of claims 1-3, characterized in that The number of the exhaust channels (120) is multiple, and one exhaust channel (120) is in communication with at least one arc extinguishing channel (300).

5. The quenching structure (10) according to claim 2, characterized in that The housing (100) is provided with a first isolation part (130) parallel to the reference plane. The plurality of grid fin (200) groups include a first grid fin group (210) having the smallest distance from the reference plane, and a first exhaust channel (121) is formed between the first isolation part (130) and the first grid fin group (210).

6. The quenching structure (10) according to claim 5, characterized in that The housing (100) is provided with a second isolation part (140). The plurality of grid fin (200) groups further include a second grid fin group (220) adjacent to the first grid fin group (210), a second exhaust channel (122) is formed between the second isolation part (140) and the second grid fin group (220), the first isolation part (130) and the bottom wall of the housing (100) form a converging channel (126), and the second exhaust channel (122) is in communication with the converging channel (126).

7. The quenching structure (10) according to claim 6, characterized in that The housing (100) is provided with a third isolation part (150) and a fourth isolation part (160), the third isolation part (150) is arranged between the second isolation part (140) and the bottom wall of the housing (100), a third exhaust channel (123) is formed between the third isolation part (150) and the second isolation part (140), a fourth exhaust channel (124) is formed between the third isolation part (150) and the bottom wall of the housing (100), and a fifth exhaust channel (125) is formed between the fourth isolation part (160) and the bottom wall of the housing (100). The fourth isolation part (160) is provided with a first air guide groove (161), the plurality of groups of grid fins (200) further include a third group of grid fins (230) adjacent to the second group of grid fins (220), one end of the first air guide groove (161) is communicated with the arc extinguishing channel (300) of the third group of grid fins (230), and the other end is communicated with the fifth exhaust channel (125), one end of the third exhaust channel (123) and the fourth exhaust channel (124) is commonly communicated with the fifth exhaust channel (125), and the other end is commonly communicated with the converging channel (126).

8. The quenching structure (10) according to claim 7, characterized in that The fourth isolation part (160) is provided with a second air guide groove (162), the plurality of groups of grid fins (200) further include a fourth group of grid fins (240) adjacent to the third group of grid fins (230), one end of the second air guide groove (162) is communicated with the arc extinguishing channel (300) of the fourth group of grid fins (240), and the other end is communicated with the fifth exhaust channel (125).

9. A circuit breaker (1) characterized by The circuit breaker (1) further includes a pole connection terminal (30), the pole connection terminal (30) is arranged at the bottom wall of the shell (100) and located at one side of the arc extinguishing part (110).

10. The circuit breaker (1) according to claim 9, characterized in that The circuit breaker (1) further includes a pole connection terminal (30), the pole connection terminal (30) is arranged at the bottom wall of the shell (100) and located at one side of the arc extinguishing part (110).

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