An arc extinguishing system and a breaking device having the arc extinguishing system

Abstract

The present invention relates to an arc extinguishing system and a breaking device having the arc extinguishing system. The arc extinguishing system includes arc extinguishing grid plates and an insulating member. The insulating member includes insulating portions corresponding to the number of the arc extinguishing grid plates. The corresponding insulating portions abut against the lower ends of the corresponding arc extinguishing grid plates and at least cover the lower edges of the arc extinguishing grid plates, and adjacent insulating portions are spaced apart with an air gap therebetween. In the present invention, the arc extinguishing grid plates in the arc extinguishing system are arranged such that their lower ends abut against the insulating portions, so that when an arc passes through the arc extinguishing grid plates and then through the insulating portions, the arc can be further deionized, reducing the arcing distance. Moreover, the insulating portions generally cover the lower ends of the arc extinguishing grid plates. Even if an arc with sufficient charged particles moves to this end portion, the insulating portions can eliminate the short-circuit phenomenon between the grid plates, thereby increasing the arc voltage, reducing the arcing time, and improving the breaking capacity of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the field of interrupting devices, and particularly to an improvement in the arc extinguishing system therein. Background Art

[0002] When a circuit breaker interrupts, the initial distance between the moving contact and the static contact is small, and the electric field strength is high. An arc will be generated between the moving and static contacts. If the arc is not extinguished, the circuit cannot be completely disconnected. Moreover, the temperature of the arc is very high, and the high-temperature arc will burn out the equipment, causing serious accidents. The arc extinguishing grid is the main structure for extinguishing the arc, but the length of the arc extinguishing grid is often limited by the volume of the circuit breaker. During the short-circuit interruption process, the interrupted energy is relatively large, and the arc extinguishing ability of the arc extinguishing grid with a short length is insufficient, resulting in the gas coming out of the arc chamber still carrying enough charged particles. Therefore, at the rear end of the grid, it is easy for the arcs between the grids to be short-circuited, thereby increasing the arc burning time, severely burning the switch, and even causing a failure in opening. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention proposes an arc extinguishing system with an optimized structure and an interrupting device having the arc extinguishing system.

[0004] The present invention is implemented by adopting the following technical solutions:

[0005] The present invention proposes an arc extinguishing system. The arc extinguishing system is arranged opposite to the contact system and is used for extinguishing the arc generated by the contact system. The contact system is relatively located at the upper end of the arc extinguishing system, and the arc extinguishing system is relatively located at the lower end of the contact system. The arc extinguishing system includes several arc extinguishing grids arranged at intervals, and also includes an insulating member. The insulating member includes insulating parts corresponding to the number of the arc extinguishing grids. The corresponding insulating parts abut against the lower ends of the corresponding arc extinguishing grids and at least cover the lower edges of the arc extinguishing grids, and the adjacent insulating parts are arranged at intervals with air gaps therebetween.

[0006] Wherein, in order to make the air channels between the insulating parts and the air channels between the arc extinguishing grids more coherent, in one embodiment, the width of the insulating part is substantially the same as the thickness of the arc extinguishing grid, so that the interval between the adjacent insulating parts is substantially the same as the interval between the adjacent arc extinguishing grids.

[0007] Wherein, considering installation and manufacturing, in one embodiment, the insulating member is a plurality of insulating monomer structures corresponding to the number of the arc extinguishing grids.

[0008] Wherein, is the length of the short arc extinguishing grid piece, so as to optimize the external shape and volume of the circuit breaker. In one embodiment, the insulating part is an integrally formed structure generally in a "U" shape. The integrally formed structure in a "U" shape has hooks at its two upper ends. The two side ends of the arc extinguishing grid piece near the lower edge respectively have bayonets matching the hooks. The insulating part is connected and fixed in the bayonets by matching its hooks, so that the insulating part and the arc extinguishing grid piece are embedded and fixed into an integral sheet-like structure.

[0009] Wherein, for the convenience of assembling the arc extinguishing system and reducing costs, in one embodiment, the arc extinguishing system further includes a first grid piece mounting plate and a second grid piece mounting plate. The first grid piece mounting plate and the second grid piece mounting plate are respectively arranged on the left and right sides of the arc extinguishing grid piece. The insulating part is a plurality of first insulating rods and second insulating rods corresponding in number and respectively fixedly connected to the first grid piece mounting plate and the second grid piece mounting plate. The plurality of first insulating rods are arranged at intervals on the first grid piece mounting plate in a comb-like shape. The plurality of second insulating rods are arranged at intervals on the second grid piece mounting plate in a comb-like shape. The corresponding first insulating rods and the corresponding second insulating rods extend towards each other and are butt-jointed to form the insulating part. The arc extinguishing grid piece is fixed between the first grid piece mounting plate and the second grid piece mounting plate, and the lower end of the arc extinguishing grid piece abuts against the insulating part.

[0010] Wherein, for achieving a tight butt-joint fit and being more convenient for assembly operation through alignment during the butt-joint process, in one embodiment, the first insulating rod and the second insulating rod achieve the butt-joint through the mortise and tenon structure at their respective relative ends.

[0011] Wherein, for making the contact fit between the arc extinguishing grid piece and the insulating part more stable, in one embodiment, the first insulating rod and the second insulating rod are "L"-shaped structures with steps. The first insulating rod and the second insulating rod are butt-jointed to form the "U"-shaped insulating part. The lower end of the arc extinguishing grid piece is roughly surrounded by the "U"-shaped insulating part.

[0012] Wherein, based on assembly and manufacturing considerations, in one embodiment, both the first grid piece mounting plate and the second grid piece mounting plate are provided with grid piece mounting grooves opened from top to bottom. The arc extinguishing grid piece is inserted and fixed in the grid piece mounting grooves from top to bottom.

[0013] Wherein, based on assembly and manufacturing considerations, in one embodiment, the arc extinguishing grid piece is further provided with hooks. The first grid piece mounting plate and the second grid piece mounting plate have hanging parts matching the hooks. The arc extinguishing grid piece is hung on the hanging parts by its hooks.

[0014] Among them, for assembly and manufacturing considerations, in one embodiment, the insulating member is an insulating plate, and a plurality of strip-shaped ventilation holes arranged at intervals are provided on the insulating plate, and the insulating part is the solid part of the insulating member between every two adjacent ventilation holes.

[0015] Among them, to improve the arc extinguishing efficiency, in one embodiment, the insulating part is made of gas-producing material.

[0016] Based on the above arc extinguishing system, the present invention also proposes a breaking device, and the breaking device has the above arc extinguishing system.

[0017] The present invention has the following beneficial effects: In this embodiment, the arc extinguishing grid in the arc extinguishing system is set to abut against the insulating part at the lower end, so that when the arc passes through the arc extinguishing grid and then through the insulating part, it can be further deionized, reducing the arcing distance. Moreover, the insulating part generally covers the lower end of the arc extinguishing grid. Even if the arc with sufficient charged particles moves to this end, the insulating part can eliminate the short-circuit phenomenon between the grids, thereby increasing the arc voltage, reducing the arcing time, and improving the breaking capacity of the circuit breaker. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the circuit breaker in Embodiment 1;

[0019] Figure 2 is an exploded schematic diagram of the contact system and the arc extinguishing system of the circuit breaker in Embodiment 1;

[0020] Figure 3 is a schematic diagram of the arc extinguishing system in Embodiment 1;

[0021] Figure 4 is an exploded schematic diagram of the arc extinguishing system in Embodiment 1;

[0022] Figure 5 is a schematic diagram of the arc extinguishing grid, the first insulating rod, and the second insulating rod in Embodiment 1;

[0023] Figure 6 is a schematic diagram of the arc extinguishing grid assembled in the grid mounting groove of the first grid mounting plate in Embodiment 1;

[0024] Figure 7 is a front view of the arc extinguishing system in Embodiment 1;

[0025] Figure 8 is Figure 7 a cross-sectional view taken along line A-A in

[0026] Figure 9 is Figure 7 a cross-sectional view taken along line B-B in

[0027] Figure 10It is a schematic diagram of the arc extinguishing system in Embodiment 2;

[0028] Figure 11 It is an exploded schematic diagram of the arc extinguishing system in Embodiment 2;

[0029] Figure 12 It is a schematic diagram of the arc extinguishing grid and the insulating part being fitted and fixed together as a whole in Embodiment 2;

[0030] Figure 13 It is an exploded view of the arc extinguishing grid and the insulating part in Embodiment 2;

[0031] Figure 14 It is a schematic diagram of the insulating part in Embodiment 3. Detailed implementation manners

[0032] To further illustrate each embodiment, the present invention provides accompanying drawings. These drawings are a part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used to explain the operation principle of the embodiments in combination with the relevant descriptions in the specification. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0033] Now, the present invention will be further described in combination with the accompanying drawings and the detailed implementation manners.

[0034] Embodiment 1:

[0035] As a preferred embodiment of the present invention, a circuit breaker is provided. Refer to Figure 1-2 , the circuit breaker includes a housing and a contact system 1 and an arc extinguishing system 2 installed in the housing. The contact system 1 and the arc extinguishing system 2 are arranged opposite to each other. The contact system 1 includes a movable moving contact and a fixed static contact. The moving contact contacts or separates from the static contact by virtue of its movement to realize the conduction and breaking of the circuit breaker. The arc extinguishing system 2 is arranged approximately along the length direction of the circuit breaker housing. Refer to Figure 3-4, the arc extinguishing system 2 includes arc extinguishing grid plates 23, and several arc extinguishing grid plates 23 are linearly arranged at intervals to extinguish the arc. For the convenience of description, it is defined that the contact system 1 is relatively located at the upper end of the arc extinguishing system 2, then the arc extinguishing system 2 is relatively located at the lower end of the contact system 1. Of course, in actual applications, the circuit breaker may also be arranged vertically, that is, at this time the arc extinguishing system 2 is arranged to extend substantially vertically. In this case, the contact system 1 is generally located at the left end (or right end) of the arc extinguishing system 2, and the arc extinguishing system 2 is generally located at the right end (or left end) of the contact system 1. That is to say, in actual applications, the specific relative orientation of the contact system 1 and the arc extinguishing system 2 may vary due to different installation positions. The orientation descriptions exemplified in this example should be regarded as exemplary explanations based on the drawings for the convenience of description and should not be used as a structural limitation of the present invention. The arc extinguishing system 2 further includes a gas-producing insulating plate 21. The gas-producing insulating plate 21 is arranged at one end of the arc extinguishing grid plates 23 relatively close to the contact system 1. The gas-producing insulating plate 21 includes two relatively arranged first gas-producing insulating plates 211 and second gas-producing insulating plates 212. The first gas-producing insulating plates 211 and the second gas-producing insulating plates 212 substantially enclose the moving contact of the contact system 1. The first gas-producing insulating plates 211 and the second gas-producing insulating plates 212 are made of insulating and gas-producing materials, such as nylon, melamine, PA46, etc. When the circuit breaker is opened, an arc is generated between the moving and static contacts. The first gas-producing insulating plates 211 and the second gas-producing insulating plates 212 can generate a large amount of gas under the high-temperature burning of the arc, and the gas further promotes the movement of the arc to accelerate arc extinguishing. Grid plate mounting plates 22 are provided on both sides of the arc extinguishing grid plates 23 for fixedly mounting the arc extinguishing grid plates 23. The grid plate mounting plates 22 include a first grid plate mounting plate 221 and a second grid plate mounting plate 222. The arc extinguishing grid plates 23 are fixed between the first grid plate mounting plate 221 and the second grid plate mounting plate 222. An insulating member abuts against the lower end of the arc extinguishing grid plates 23. The insulating member includes insulating portions corresponding to the number of the arc extinguishing grid plates 23. Refer to Figure 3-6 , the insulating member includes a first insulating rod 241 and a second insulating rod 242. The first insulating rod 241 and the second insulating rod 242 are rod-shaped structures extending from the first grid plate mounting plate 221 and the second grid plate mounting plate 222 respectively. The first insulating rods 241 are arranged at intervals on the first grid plate mounting plate 221 in a comb-like shape, and the second insulating rods 242 are arranged at intervals on the second grid plate mounting plate 222 in a comb-like shape. The corresponding first insulating rods 241 and the corresponding second insulating rods 242 extend towards each other and are butted together to form the insulating member. Each individual insulating member forms an insulating portion 24. Specifically, such as Figure 4As shown, the opposite ends of the two are docked through a mortise and tenon structure with mutually matching shapes, which can not only achieve a tight docking fit, but also have a positioning effect during the docking process, making the assembly operation more convenient. In this embodiment, the first insulating rod 241 and the second insulating rod 242 are integrally formed on the first grid plate mounting plate 221 and the second grid plate mounting plate 222 in a single-body structure. Therefore, during manufacturing, the insulating rod and the grid plate mounting plate are integrally injection-molded, with low manufacturing costs and a simple assembly process for the first grid plate mounting plate 221 and the second grid plate mounting plate 222. The first grid plate mounting plate 221 is provided with a grid plate mounting groove 2211 opened from top to bottom (the second grid plate mounting plate 222 also has the same grid plate mounting groove structure). The arc extinguishing grid plate 23 is inserted into the grid plate mounting groove 2211 from top to bottom, and the lower end of the arc extinguishing grid plate 23 abuts against the insulating portion 24 and is carried by the insulating portion 24. Thus, the arc extinguishing grid plate 23 is embedded and fixed between the first grid plate mounting plate 221 and the second grid plate mounting plate 222. In this embodiment, the insulating portion 24 is used to carry the arc extinguishing grid plate 23, and the arc extinguishing grid plate 23 is embedded by the grid plate mounting groove provided on the grid plate mounting plate 22. When installing the arc extinguishing grid plate 23, it only needs to be inserted into the space between the first grid plate mounting plate 221 and the second grid plate mounting plate 222 from top to bottom along the grid plate mounting groove, with a relatively simple installation process and high installation efficiency. More importantly, since the lower end of the arc extinguishing grid plate 23 abuts against the insulating portion 24, when the arc passes through the arc extinguishing grid plate 23 and then through the insulating portion 24 here, it can be further deionized, reducing the arcing distance. Moreover, the insulating portion 24 generally covers one end of the arc extinguishing grid plate 23 relatively far from the contact system 1. Even if an arc with sufficient charged particles moves to this end, the insulating portion 24 can eliminate the short-circuit phenomenon between the grid plates, thereby increasing the arc voltage, reducing the arcing time, and improving the breaking capacity of the circuit breaker. As Figure 9 shown, the first insulating rod 241 and the second insulating rod 242 are in a stepped structure in the shape of an "L", and the two are docked to form a U-shaped insulating portion 24, while the lower end of the arc extinguishing grid plate 23 is in a trapezoidal structure matching this U-shape. In other embodiments, the insulating portion 24 can merely cover the lower edge of the arc extinguishing grid plate 23. For example, the insulating portion 24 is in a strip-shaped structure in the shape of a "-", which can achieve the above-mentioned deionization and short-circuit elimination functions. However, in this embodiment, it is preferably to set the insulating portion 24 in a U-shaped structure surrounding the lower end of the arc extinguishing grid plate 23, so that the protection range of the insulating portion 24 is more complete, the short-circuit elimination function is more stable and reliable, and at the same time, the contact fit between the arc extinguishing grid plate 23 and the insulating portion 24 is also more stable.

[0036] In this embodiment, both the first insulating rod 241 and the second insulating rod 242 are comb-shaped structures with air gaps, such that each insulating part 24 is arranged at intervals corresponding to the arc extinguishing grid plates 23 to form a fence-like shape. There is a certain air gap between adjacent insulating parts 24. Therefore, although the insulating part 24 is attached to the lower end of the arc extinguishing grid plate 23, it does not block the air passage between adjacent arc extinguishing grid plates 23, thus maintaining the smoothness of the initial arc entering the arc extinguishing chamber. In this embodiment, the width of the insulating part 24 is approximately the same as the thickness of the arc extinguishing grid plate 23, such that the air gap between the insulating parts 24 is approximately the same as the air gap between the arc extinguishing grid plates 23 to further ensure the continuity of the air passage.

[0037] Refer to again Figure 4 and Figure 6 , on the opposite sides of the first grid plate mounting plate 221 and the second grid plate mounting plate 222, there are also convex parts with an arc shape (such as the convex part 2210 of the first grid plate mounting plate 221 shown in the figure). The convex parts are inserted between the arc extinguishing grid plates 23. The two opposite convex parts first form a contraction channel with a decreasing diameter between the air gaps of the arc extinguishing grid plates 23, and then form an expansion channel with an increasing diameter, that is, generally form a Laval nozzle channel with a channel diameter decreasing from large to small and contracting towards the middle, and then increasing from small to large and expanding outwards. Under the action of the Laval nozzle channel, the gas accelerates, which can further push the arc to move. At the same time, the Laval nozzle channel with a narrow opening structure can further compress the arc, increase the arc voltage, deionize, and reduce arc restriking.

[0038] In addition, some of the arc extinguishing grid plates 23 are also provided with hooks 231, such as Figure 8 , on the first grid plate mounting plate 221 and the second grid plate mounting plate 222, there are hanging parts matching the hooks 231 (such as the hanging part 2220 of the second grid plate mounting plate 222 shown in the figure). The arc extinguishing grid plate 23 is hung on the hanging part with its hook 231, so as to be further fixed between the first grid plate mounting plate 221 and the second grid plate mounting plate 222.

[0039] The insulating part 24 can be an insulating non-gas-producing material, such as BMC, SMC, GPO, phenolic mold, etc., or an insulating gas-producing material such as nylon, melamine, POM, etc. In this embodiment, the insulating part 24 is made of an insulating gas-producing material. Thus, when the arc passes through the insulating part 24, it ablates the insulating part 24 to produce gas, and the gas flow pushes the arc to move and quickly takes away the heat in the arc extinguishing system.

[0040] The arc extinguishing system structure provided in this embodiment can be applicable to different current levels of small, medium, and large, and is particularly applicable to the case of small current. In the case of small current, the arc intensity generated by the contact system is not high and the number is not large, and it is relatively easy to pass through the arc extinguishing grid plates and gather at the end of the grid plates.

[0041] Although this embodiment illustrates the specific structure and function of the arc extinguishing system using a circuit breaker as an example, the arc extinguishing system provided in this embodiment can also be used in other interrupting devices, such as knife switches, disconnectors, contactors, etc.

[0042] Embodiment 2:

[0043] This embodiment provides another circuit breaker, including a contact system and an arc extinguishing system arranged in the same manner as in Embodiment 1. The arc extinguishing system is similar in structure to the arc extinguishing system in Embodiment 1 and has the same functions of the same structures as in Embodiment 1, such as a gas-producing insulating plate, a Laval nozzle channel, etc. However, the structure of the insulating part in this embodiment is different from that in Embodiment 1. In this embodiment, the insulating part is a plurality of insulating monomer structures corresponding to the number of arc extinguishing grid pieces 23. Refer to Figure 10-13 , the arc extinguishing system includes arc extinguishing grid pieces 23' and insulating hooks 24'. The insulating hooks 24' are embedded at the end of the arc extinguishing grid pieces 23' relatively far from the contact system. Specifically, the insulating hooks 24' are an integrally formed structure generally in a "U" shape, including an insulating part 24'3 generally in a "U" shape and a first hook part 24'1 and a second hook part 24'2 connected to the upper end of the insulating part 24'3. The two side ends of the arc extinguishing grid pieces 23' near the lower edge have a first bayonet 23'1 and a second bayonet 23'2 matching the first hook part 24'1 and the second hook part 24'2. The insulating hooks 24' are embedded and fixed in the first bayonet 23'1 and the second bayonet 23'2 of the arc extinguishing grid pieces 23' with their first hook part 24'1 and second hook part 24'2, so that the insulating hooks 24' and the arc extinguishing grid pieces 23' are connected into a sheet-like integral structure. The "U"-shaped insulating part 24'3 surrounds the end of the arc extinguishing grid pieces 23' and the two are fitted and connected, so that when the arc passes through the arc extinguishing grid pieces 23' and then passes through the insulating hooks 24' here, it can be further deionized, reducing the arcing distance. And even if the arc with enough charged particles moves to this end, the insulating hooks 24' can also eliminate the short-circuit phenomenon between the grid pieces, thereby increasing the arc voltage, reducing the arcing time, and improving the breaking capacity of the circuit breaker.

[0044] In this embodiment, embedding the insulating hooks 24' at the end of the arc extinguishing grid pieces 23' can shorten the length of the arc extinguishing grid pieces, thereby optimizing the external shape and volume of the circuit breaker, reducing the installation and use space. At the same time, the insulating hooks 24' are the same as the insulating part 24 in Embodiment 1 and do not block the air channels between adjacent arc extinguishing grid pieces 23. And the installation method of directly embedding the insulating part at the end of the arc extinguishing grid pieces does not need to consider other installation structures (such as grid piece mounting plates) and can use various arc extinguishing systems with different structures.

[0045] Embodiment 3:

[0046] This embodiment provides another circuit breaker, including a contact system and an arc extinguishing system arranged in the same manner as in Embodiments 1 and 2. The arc extinguishing system is similar in structure to the arc extinguishing systems in Embodiments 1 and 2 and has the same functions of the same structures in Embodiments 1 and 2, such as the gas-producing insulating plate, the Laval nozzle channel, etc. However, this embodiment is different from Embodiments 1 and 2 in the structure of the insulating member. Refer to Figure 14 , the insulating member 24 in this embodiment is a whole insulating plate 100. The whole insulating plate 100 is fixedly installed at the bottom of the arc extinguishing grid plates. A plurality of strip-shaped ventilation holes 101 arranged at intervals are provided on the insulating plate 100. The insulating plate 100 has insulating portions 102 corresponding to the number of arc extinguishing grid plates. The insulating portion 102 is a solid portion between every two adjacent ventilation holes 101. In this embodiment, ventilation holes 101 are opened on an integral insulating plate 101 to separate each insulating portion 102, and each insulating portion 102 individually corresponds to an arc extinguishing grid plate. This implementation method is very convenient in manufacturing and can save costs and manufacturing processes.

[0047] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims all fall within the protection scope of the present invention.

Claims

1. An arc extinguishing system, which is arranged opposite to the contact system and is used for extinguishing the arc generated by the contact system. Characterized in that: The contact system is relatively located at the upper end of the arc extinguishing system, and the arc extinguishing system is relatively located at the lower end of the contact system. The arc extinguishing system includes several arc extinguishing grid plates arranged at intervals, and also includes an insulating member. The insulating member includes insulating parts corresponding to the number of the arc extinguishing grid plates. The corresponding insulating parts abut against the lower ends of the corresponding arc extinguishing grid plates and at least cover the lower edges of the arc extinguishing grid plates, and the adjacent insulating parts are arranged at intervals with an air gap therebetween.

2. The arc extinguishing system according to claim 1, Characterized in that: The width of the insulating part is substantially the same as the thickness of the arc extinguishing grid plate, so that the interval between adjacent insulating parts is substantially the same as the interval between adjacent arc extinguishing grid plates.

3. The arc extinguishing system according to claim 1, Characterized in that: The insulating member is a plurality of insulating monomer structures corresponding to the number of the arc extinguishing grid plates.

4. The arc extinguishing system according to claim 3, Characterized in that: The insulating member is a generally "U"-shaped integral structure. The two upper ends of this "U"-shaped integral structure have hooks, and the two side ends of the arc extinguishing grid plate near the lower edge respectively have bayonets matching the hooks. The insulating member is connected and fixed in the bayonets by its hooks, so that the insulating member and the arc extinguishing grid plate are embedded and fixed into an integral sheet-like structure.

5. The arc extinguishing system according to claim 1, Characterized in that: It further includes a first grid plate mounting plate and a second grid plate mounting plate. The first grid plate mounting plate and the second grid plate mounting plate are respectively arranged on the left and right sides of the arc extinguishing grid plate. The insulating member is a plurality of first insulating rods and second insulating rods corresponding to the number and respectively fixedly connected to the first grid plate mounting plate and the second grid plate mounting plate. The plurality of first insulating rods are arranged at intervals on the first grid plate mounting plate in a comb-like shape, and the plurality of second insulating rods are arranged at intervals on the second grid plate mounting plate in a comb-like shape. The corresponding first insulating rods and the corresponding second insulating rods extend towards each other and are butt-jointed to form the insulating parts. The arc extinguishing grid plate is fixed between the first grid plate mounting plate and the second grid plate mounting plate, and the lower end of the arc extinguishing grid plate abuts against the insulating parts.

6. The arc extinguishing system according to claim 5, Characterized in that: The first insulating rod and the second insulating rod realize the butt-joint through the mortise and tenon structure at their respective opposite ends.

7. The arc extinguishing system according to claim 5, Characterized in that: The first insulating rod and the second insulating rod are "L"-shaped structures with steps. The first insulating rod and the second insulating rod are butt-jointed to form the "U"-shaped insulating part, and the lower end of the arc extinguishing grid plate is substantially surrounded by the "U"-shaped insulating part.

8. The arc extinguishing system according to claim 5, Characterized in that: Both the first grid plate mounting plate and the second grid plate mounting plate are provided with grid plate mounting grooves opened from top to bottom, and the arc extinguishing grid plate is inserted and fixed in the grid plate mounting grooves from top to bottom.

9. The arc extinguishing system according to claim 5, It is characterized in that: The arc extinguishing grid sheet is further provided with a hook, the first grid sheet mounting plate and the second grid sheet mounting plate have hanging parts matching the hook, and the arc extinguishing grid sheet is hung on the hanging parts by its hook.

10. The arc extinguishing system according to claim 1, It is characterized in that: The insulating part is an insulating plate, and a plurality of strip-shaped ventilation holes arranged at intervals are provided on the insulating plate, and the insulating part is the solid part of the insulating part between every two adjacent ventilation holes.

11. A breaking device, It is characterized in that: The breaking device has the arc extinguishing system according to any one of claims 1-10.

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