Zero-flashover device

Abstract

The utility model discloses a zero flashover device, which comprises a housing and an arc extinguishing module, the housing is provided with a plurality of mounting grooves with openings facing a wiring end, the arc extinguishing module is detachably mounted in the mounting grooves through a plug-in structure, the arc extinguishing module comprises an arc extinguishing frame and an arc extinguishing chamber arranged in the arc extinguishing frame in a penetrating manner, and the arc extinguishing chamber is detachably mounted in the mounting grooves through the plug-in structure. The arc extinguishing chamber is arranged in the mounting groove, the plurality of arc extinguishing meshes are arranged in the arc extinguishing chamber at intervals, the opening direction of the arc extinguishing chamber is consistent with the opening direction of the mounting groove, and the arc extinguishing module plays roles of secondary arc extinguishing, metal particle adsorption and free gas neutralization on electric arc and gas sprayed out of the wiring end, so that the flashover phenomenon at the wiring end of the circuit breaker is avoided, and the service life of the circuit breaker is prolonged. According to the zero-flashover cover, the requirement for zero flashover is better met, use is safe and reliable, modular installation of the arc extinction module on the cover shell is achieved, the installation structure is simplified, installation and disassembly are convenient, the installation efficiency is improved, automatic production and assembly of the zero-flashover cover are facilitated, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a zero-arc device. Background Technology

[0002] During the tripping operation of a molded case circuit breaker under load or in the event of a fault with high current, an electric arc is generated. The arc-extinguishing chamber inside the circuit breaker alone cannot completely and reliably extinguish the arc. Residual arc particles are ejected along the gas duct towards the circuit breaker ports, carrying a large amount of hot metal particles directly with the arc, easily damaging the insulation at the terminals. Current practice involves installing an arc-extinguishing cover at the circuit breaker ports to extinguish the arc and block metal particles. The arc-extinguishing cover consists of a housing with multiple mounting cavities and multiple arc-extinguishing plates housed within these cavities. These cavities correspond to the multiple ports of the circuit breaker, and the arc-extinguishing plates must be inserted one by one into the slots within the mounting cavities. This complex installation structure and numerous steps reduce installation efficiency and hinder automated production and assembly of the arc-extinguishing cover. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the problems of complex installation structure, numerous installation steps, and reduced installation efficiency of the arc suppression cover in the prior art, which is not conducive to the automated production and assembly of the arc suppression cover.

[0004] To solve the above-mentioned technical problems, this utility model provides a zero-arc flash device, comprising:

[0005] The housing, installed at the terminals of the circuit breaker, has multiple mounting slots with openings facing the terminals;

[0006] The arc-suppression module is detachably installed in the mounting slot via a plug-in structure. The arc-suppression module includes an arc-suppression frame adapted to the mounting slot, an arc-suppression chamber penetrating through the arc-suppression frame, and a plurality of arc-suppression meshes spaced apart in the arc-suppression chamber. The opening direction of the arc-suppression chamber is consistent with the opening direction of the mounting slot. The plug-in structure includes a set of first plug-in slots disposed opposite to each other on the inner walls of the two sides of the mounting slot, and a set of plug-in strips disposed corresponding to the two side walls of the arc-suppression frame and inserted into the plug-in slots.

[0007] As a preferred embodiment, the cover includes an outer grille plate disposed on the rear side of the mounting groove, the front side of the arc-extinguishing frame is provided with an opening facing the wiring terminal, and the rear side is provided with an inner grille plate opposite to the grille baffle. The inner grille plate and the outer grille plate are respectively provided with a plurality of ventilation hole structures.

[0008] As a preferred embodiment, the plug-in structure further includes an elastic plug-in buckle disposed on the inner grid plate and a snap-fit ​​hole disposed on the outer grid plate and engaging with the elastic plug-in buckle.

[0009] As a preferred embodiment, the upper end of the arc-extinguishing frame is provided with multiple slots that communicate with the arc-extinguishing chamber, and the lower end of the arc-extinguishing frame is a closed structure, with multiple arc-extinguishing mesh pieces inserted into the arc-extinguishing chamber from the multiple slots respectively.

[0010] As a preferred embodiment, multiple sets of positioning blocks are arranged at intervals on the inner walls of both sides of the arc-extinguishing chamber, and multiple sets of positioning grooves for positioning and connecting multiple arc-extinguishing meshes are formed between the multiple sets of positioning blocks. The multiple sets of positioning blocks are arranged at intervals on the inner walls of both sides of the arc-extinguishing chamber along the depth direction of the arc-extinguishing chamber.

[0011] As a preferred embodiment, the housing includes an upper baffle disposed on the upper side of the mounting groove and a wiring space disposed on the lower side of the mounting groove. The lower side of the mounting groove is provided with a lower insertion port into which an arc-suppressing frame can be inserted. The upper end of the arc-suppressing frame abuts against the upper baffle, and its lower end is accommodated in the lower insertion port.

[0012] As a preferred embodiment, multiple sets of second insertion slots for intermittently inserting multiple arc-extinguishing mesh pieces are provided on the inner walls of both sides of the mounting groove. At least one set of second insertion slots is provided in the first insertion slot, and the first insertion slot and the second insertion slot extend in the same direction to the lower insertion port.

[0013] As a preferred embodiment, a foolproof structure is provided between the mounting slot and the arc suppression module. The foolproof structure includes a foolproof opening at one end of the first insertion slot and a foolproof block correspondingly provided at one end of the insertion strip and cooperating with the foolproof opening. The width of the foolproof opening is greater than the width of the first insertion slot.

[0014] As a preferred embodiment, the inner side of the upper baffle is provided with a plurality of circular protrusions spaced apart, and a plurality of sets of rib structures connecting the plurality of circular protrusions respectively.

[0015] As a preferred embodiment, the housing includes a plurality of shearing grooves disposed on the upper baffle and a shearing portion formed by the shearing grooves, the two ends of the shearing grooves extending to one side of the upper baffle.

[0016] The technical solution of this utility model has the following advantages compared with the prior art:

[0017] 1. The zero-arc flash cover provided by this utility model consists of an arc-extinguishing module assembled from multiple arc-extinguishing meshes and an arc-extinguishing frame. These are detachably installed in the mounting slot of the cover via a plug-in structure. The cover is then installed on the circuit breaker's terminals. The arc-extinguishing module provides secondary arc extinguishing, adsorbs metal particles, and neutralizes free gases emitted from the terminals. It primarily utilizes multi-layered arc-extinguishing meshes to perform multiple deionization treatments on charged free gases, thereby absorbing and neutralizing them, reducing their activity, and achieving secondary arc extinguishing. This prevents arc flash at the circuit breaker terminals, better meeting the zero-arc flash requirement, improving the circuit breaker's arc-extinguishing capability and service life, and ensuring safe and reliable operation. The zero-arc flash cover designed using this technology allows for modular and independent installation of the arc-extinguishing module on the cover, simplifying the installation structure, facilitating installation and disassembly, simplifying maintenance, improving installation efficiency, and promoting automated production and assembly of the zero-arc flash cover, thus reducing costs.

[0018] 2. In the zero-arc shroud provided by this utility model, an elastic plug-in buckle is provided on the inner grid plate of the arc-extinguishing frame, and a corresponding snap-fit ​​hole is provided on the outer grid plate of the shroud. When the arc-extinguishing module is inserted into the mounting groove of the shroud, the elastic plug-in buckle is snapped into the snap-fit ​​hole to form a snap-fit ​​fit, thereby realizing the installation and fixation of the arc-extinguishing module in the mounting groove, preventing the arc-extinguishing module from slipping out of the mounting groove. In addition, the plug-in fit between the first plug-in groove and the plug-in strip ensures the stability and reliability of the arc-extinguishing module installation.

[0019] 3. In the zero-arc cover provided by this utility model, multiple arc-extinguishing mesh pieces are inserted into the arc-extinguishing chamber through multiple slots at the upper end of the arc-extinguishing frame. By setting multiple sets of positioning blocks opposite to each other on the inner walls of both sides of the arc-extinguishing chamber, and forming multiple sets of positioning grooves between the multiple sets of positioning blocks, the multiple arc-extinguishing mesh pieces inserted into the arc-extinguishing chamber are respectively positioned and connected with the multiple sets of positioning grooves. This realizes the positioning and installation of multiple arc-extinguishing mesh pieces in the arc-extinguishing chamber, thereby assembling multiple arc-extinguishing mesh pieces and the arc-extinguishing frame into an integral arc-extinguishing module, which is then inserted into the mounting groove of the cover, achieving the effect of modular assembly.

[0020] 4. In the zero-arc hood provided by this utility model, the hood includes an upper baffle plate and a wiring space disposed on the upper and lower sides of the mounting groove. The arc-extinguishing frame is inserted into the mounting groove from bottom to top from the lower insertion port, so that the upper end of the arc-extinguishing frame with the slot is exactly abutting the upper baffle plate, while the lower end of the arc-extinguishing frame is accommodated in the lower insertion port. The advantages of this design are that, on the one hand, the upper baffle plate blocks the position of the slot, thereby limiting and blocking the arc-extinguishing mesh plate inserted in the slot. On the other hand, the lower end of the arc-extinguishing frame blocks the lower insertion port, thereby preventing charged free gas from entering the wiring space through the lower insertion port, so as to ensure the safety of the wiring board in the wiring space and achieve the insulation isolation effect between the arc-extinguishing chamber and the wiring space.

[0021] 5. In the zero-arc shroud provided by this utility model, the arc-extinguishing mesh in the zero-arc shroud can be installed in two ways. One is that the arc-extinguishing mesh and the arc-extinguishing frame are integrated into an arc-extinguishing module, and then the arc-extinguishing module is inserted into the mounting slot through the first insertion slot to achieve modular assembly; the other is to use the traditional installation method to install the arc-extinguishing mesh on the shroud, that is, the arc-extinguishing mesh can also be inserted into the mounting slot through the second insertion slot. This design allows users to choose to install the arc-extinguishing module or the arc-extinguishing mesh according to their actual needs. It has good installation versatility, meets various user needs, and improves product performance.

[0022] 6. In the zero-arc flyback cover provided by this utility model, since the cover is installed at the terminal of the circuit breaker, it will block part of the mounting hole position of the electric operating mechanism. Therefore, when the circuit breaker is selected to install the electric operating mechanism, it is necessary to use a tool to cut off the shearing part along the shearing groove position, so as to make room for the mounting hole position for the electric operating mechanism. The zero-arc flyback cover with this structure can cut off or retain the shearing part according to the selection requirements of the electric operating mechanism, which is more convenient to use, helps to reduce material inventory, and thus reduces costs. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0024] Figure 1 A three-dimensional structural diagram of the zero-flying arc device provided by this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the cover of this utility model;

[0026] Figure 3 This is a bottom view of the casing of this utility model;

[0027] Figure 4 This is a three-dimensional structural diagram of the arc suppression module of this utility model;

[0028] Figure 5 This is a schematic diagram of the back structure of the arc suppression module of this utility model;

[0029] Figure 6 This is a schematic diagram of the arc-extinguishing frame of this utility model.

[0030] Explanation of reference numerals in the attached drawings: 1. Cover; 11. Outer grille; 12. Snap-fit ​​hole; 13. Upper baffle; 14. Wiring space; 15. Circular boss; 16. Raised rib structure; 2. Mounting groove; 21. First insertion groove; 22. Second insertion groove; 23. Anti-fooling opening; 3. Arc suppression frame; 31. Inner grille; 32. Slot opening; 4. Arc suppression chamber; 5. Arc suppression mesh; 6. Positioning block; 61. Positioning groove; 7. Elastic insertion buckle; 8. Insertion strip; 81. Anti-fooling block; 9. Shearing groove; 91. Shearing part; a. Arc suppression module. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Example

[0035] The following is a detailed description of this embodiment with reference to the accompanying drawings:

[0036] This embodiment provides, as follows: Figure 1-6 The zero-arc flash device shown includes a housing 1 and multiple arc-extinguishing modules a. The housing 1 is installed on the terminals of a circuit breaker and has multiple mounting slots 2 with openings facing the terminals. The arc-extinguishing modules a are detachably installed in the mounting slots 2 via a plug-in structure. Each arc-extinguishing module a includes an arc-extinguishing frame 3 adapted to the mounting slot 2, an arc-extinguishing chamber 4 penetrating the arc-extinguishing frame 3, and multiple arc-extinguishing meshes 5 spaced apart in the arc-extinguishing chamber 4. The opening direction of the arc-extinguishing chamber 4 is consistent with the opening direction of the mounting slot 2. The plug-in structure includes a set of first plug-in slots 21 oppositely disposed on the inner walls of both sides of the mounting slot 2, and a set of plug-in strips 8 correspondingly disposed on the side walls of the arc-extinguishing frame 3 and inserted into the plug-in slots.

[0037] The above-described implementation method is the core technical solution of this embodiment. The arc-extinguishing module is assembled from multiple arc-extinguishing meshes 5 and an arc-extinguishing frame 3, and is detachably installed in the mounting slot 2 of the cover through a plug-in structure. The cover 1 is then installed on the terminal of the circuit breaker. The arc-extinguishing module plays a secondary role in extinguishing the arc and gas ejected from the terminal, adsorbing metal particles, and neutralizing free gas. It mainly utilizes the multi-layered arc-extinguishing meshes 5 to perform multiple deionization treatments on charged free gas, thereby achieving the effect of absorbing and neutralizing charged free gas, reducing its activity, and realizing the purpose of secondary arc extinguishing. This avoids the occurrence of arc flash at the circuit breaker terminal, better achieving the requirement of zero arc flash, improving the arc extinguishing capability and service life of the circuit breaker, and ensuring safe and reliable use. The zero arc flash cover designed using this technical solution enables the modular and independent installation of the arc-extinguishing module a on the cover 1, simplifying the installation structure, facilitating installation and disassembly, simplifying maintenance, improving installation efficiency, and promoting automated production and assembly of the zero arc flash cover, thus reducing costs.

[0038] The following is combined with Figure 2-6 A detailed explanation of the specific structure of the arc suppression module is provided below:

[0039] The housing 1 includes an outer grid plate 11 disposed on the rear side of the mounting groove 2. The front side of the arc-extinguishing frame 3 is provided with an opening facing the terminal block, and the rear side is provided with an inner grid plate 31 opposite to the grid baffle. The inner grid plate 31 and the outer grid plate 11 are respectively provided with a plurality of ventilation hole structures. The charged ionized gas and residual arc ejected from the circuit breaker terminal block enter the arc-extinguishing chamber 4 through the opening. The multi-layered arc-extinguishing mesh 5 can adsorb and eliminate the ions in the ionized gas, playing a secondary arc-extinguishing role and blocking the metal particles from being ejected outward. Finally, the gas after being filtered and deionized is discharged outward from the ventilation hole structure of the outer grid plate. This will not cause ablation damage to the terminal block and achieve a zero-arc effect.

[0040] To ensure the stability of the arc-extinguishing module a in the mounting slot, the plug-in structure further includes an elastic plug-in buckle 7 on the inner grid plate 31 and a snap-fit ​​hole 12 on the outer grid plate 11 that engages with the elastic plug-in buckle 7. With this structure, when the arc-extinguishing module is inserted into the mounting slot 2 of the cover 1, the elastic plug-in buckle 7 engages with the snap-fit ​​hole 12, thereby fixing the arc-extinguishing module in the mounting slot 2 and preventing the arc-extinguishing module a from slipping out of the mounting slot 2. In addition, the plug-in engagement between the first plug-in slot 21 and the plug-in strip 8 further ensures the stability and reliability of the arc-extinguishing module installation.

[0041] like Figure 5As shown, the upper end of the arc-extinguishing frame 3 is provided with multiple slots 32 that connect to the arc-extinguishing chamber 4 at intervals. The lower end of the arc-extinguishing frame 3 is a closed structure. Multiple arc-extinguishing mesh pieces 5 are inserted into the arc-extinguishing chamber 4 from the multiple slots 32. More preferably, multiple sets of positioning blocks 6 are arranged at intervals on both sides of the inner wall of the arc-extinguishing chamber 4, and multiple sets of positioning grooves 61 are formed between the multiple sets of positioning blocks 6 for positioning and connecting the multiple arc-extinguishing mesh pieces 5. The multiple sets of positioning blocks 6 are arranged at intervals along the depth direction of the arc-extinguishing chamber 4 on both sides of the inner wall. With this structural configuration, the arc-extinguishing mesh pieces 5 inserted into the arc-extinguishing chamber 4 at the slots 32 will be correspondingly inserted into the positioning grooves 61, thus forming a positioning connection between the multiple arc-extinguishing mesh pieces 5 inserted into the arc-extinguishing chamber 4 and the multiple sets of positioning grooves 61. This achieves the positioning and installation of the multiple arc-extinguishing mesh pieces 5 in the arc-extinguishing chamber 4, allowing the multiple arc-extinguishing mesh pieces 5 and the arc-extinguishing frame 3 to assemble into an integral arc-extinguishing module, which is then inserted into the mounting groove of the cover, achieving a modular assembly effect.

[0042] like Figure 2 As shown, the housing 1 includes an upper baffle 13 disposed on the upper side of the mounting groove 2 and a wiring space 14 disposed on the lower side of the mounting groove 2. The lower side of the mounting groove 2 is provided with a lower insertion port for inserting the arc-extinguishing frame 3 into the mounting groove 2. The arc-extinguishing frame 3 is inserted into the mounting groove 2 from bottom to top through the lower insertion port. The upper end of the arc-extinguishing frame 3 abuts against the upper baffle 13, and its lower end is accommodated in the lower insertion port. The advantages of this design are that, on the one hand, the upper baffle 13 blocks the position of the slot opening 32, thereby limiting and blocking the arc-extinguishing mesh 5 passing through the slot opening 32; on the other hand, the lower end of the arc-extinguishing frame blocks the lower insertion port, thereby preventing charged ionized gas from entering the wiring space 14 through the lower insertion port, so as to ensure the safety of the wiring board in the wiring space and achieve the insulation isolation effect between the arc-extinguishing chamber 4 and the wiring space 14.

[0043] To ensure the unique installation direction of the arc-suppressing module, a foolproof structure is provided between the mounting slot 2 and the arc-suppressing module a, combined with... Figure 2 and Figure 4 As shown, the foolproof structure includes a foolproof opening 23 at one end of the first insertion slot 21 and a foolproof block 81 correspondingly disposed at one end of the insertion strip 8 and cooperating with the foolproof opening 23. The width of the foolproof opening 23 is greater than the width of the first insertion slot 21. The advantage of this design is that the cooperation between the foolproof opening 23 and the foolproof block 81 can ensure that the arc suppression module a maintains the correct orientation and position during installation, avoiding the arc suppression frame 3's slot opening 32 from being installed downwards. This foolproof structure design can effectively prevent user misoperation or incorrect installation, and prevent misinstallation problems in subsequent production and installation.

[0044] In a further preferred configuration, the upper baffle of the housing 1 is fixedly connected to the top of the circuit breaker terminal by fasteners. The inner side of the upper baffle 13 is provided with a plurality of circular protrusions 15 at intervals, and a plurality of rib structures 16 connecting the plurality of circular protrusions 15 respectively. The plurality of circular protrusions 15 are correspondingly inserted into a plurality of operating holes at the top of the terminal. This not only serves to position and connect the entire housing to the terminal, but also to provide insulation and separation at the operating hole positions. The rib structure 16 can improve the structural strength of the upper baffle and has better impact resistance.

[0045] The zero-arc flash cover provided in this embodiment, while satisfying the installation requirements of the arc-extinguishing module a, can also meet the installation requirements of the traditional arc-extinguishing mesh 5 by designing the first insertion slot 21. For specific configuration details, please refer to [reference needed]. Figure 2-3 As shown, multiple sets of second insertion slots 22 for intermittently inserting multiple arc-extinguishing mesh pieces 5 are arranged opposite each other on the inner walls of both sides of the mounting groove 2. The first insertion groove 21 is provided with one set of second insertion slots 22, and the remaining sets of second insertion slots 22 are distributed at intervals on one or both sides of the first insertion groove 21. The first insertion groove 21 and the second insertion slots 22 extend in the same direction to the lower insertion port, so that the arc-extinguishing module a is inserted into the mounting groove 2 from the lower insertion port through the first insertion slot 21; or, the arc-extinguishing mesh piece 5 is inserted into the mounting groove 2 from the lower insertion port through the second insertion slot 22. As can be seen from the above, there are two installation methods for the arc-extinguishing mesh 5 in this zero-arc cover. One method is to integrate the arc-extinguishing mesh 5 with the arc-extinguishing frame 3 into an arc-extinguishing module a, and then insert the arc-extinguishing module a into the mounting slot 2 through the first insertion slot 21 to achieve modular assembly. The other method is to use the traditional installation method to install the arc-extinguishing mesh 5 on the cover 1, that is, the arc-extinguishing mesh 5 can also be inserted into the mounting slot 2 through the second insertion slot 22. This design allows users to choose to install the arc-extinguishing module a or the arc-extinguishing mesh 5 according to their actual needs. It has good installation versatility, meets various user needs, and improves product performance.

[0046] It's important to understand that this type of molded case circuit breaker, when required for reclosing, will have an electric operating mechanism installed. The mounting bracket for this mechanism extends to the top of the terminal block, and multiple mounting holes for connecting the mechanism are located at the top of the terminal block. However, when the cover 1 is installed on the circuit breaker's terminal block, it will partially obstruct these mounting holes. To avoid interfering with the normal installation of the electric operating mechanism, refer to... Figure 1-2The housing 1 includes multiple shearing grooves 9 disposed on the upper baffle 13 and a shearing portion 91 formed by the shearing grooves 9. Both ends of the shearing grooves 9 extend to one side of the upper baffle 13, and the shearing portion 91 obstructs the mounting hole position. Therefore, when selecting an electric operating mechanism for the circuit breaker, the shearing portion 91 needs to be cut along the shearing grooves using a tool, thus making room for the mounting hole to install the electric operating mechanism. This zero-arc cover design allows for the removal or retention of the shearing portion according to the electric operating mechanism's installation requirements, making it convenient to use, reducing material inventory, and thus lowering costs.

[0047] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A zero flashover device, characterized by, The utility model relates to a circuit breaker arc extinguishing module, including: A cover (1) is installed to the wiring terminal of circuit breaker, and it has a plurality of installation slot (2) with the opening direction to the wiring terminal; Arc extinguishing module (a) is detachably installed in the installation slot (2) through the plug-in structure, the arc extinguishing module (a) includes the arc extinguishing frame (3) with the installation slot (2) is adapted, and the arc chamber (4) is arranged in the arc extinguishing frame (3) through, and a plurality of arc screen (5) are arranged in the interval in the arc chamber (4), and the opening direction of the arc chamber (4) is consistent with the opening direction of the installation slot (2);The plug-in structure includes a set of first plug-in slot (21) that is oppositely arranged on the inner wall of the both sides of the installation slot (2), and a set of plug-in strip (8) that is correspondingly arranged on the both sides of the arc extinguishing frame (3) and is inserted in the plug-in slot.

2. The zero arc-walk device according to claim 1, characterized in that: The cover (1) includes the outer grid plate (11) that is arranged in the rear side of installation slot (2), the front side of arc extinguishing frame (3) is equipped with the opening part towards the wiring terminal, and the rear side is equipped with the inner grid plate (31) with the grid baffle, the inner grid plate (31) and outer grid plate (11) are equipped with a plurality of ventilation hole structures respectively.

3. The zero arc-walk device according to claim 2, characterized in that: The plug-in structure further includes the elastic plug-in buckle (7) that is arranged on the inner grid plate (31), and the clamping hole (12) that is correspondingly arranged on the outer grid plate (11) and is formed with the elastic plug-in buckle (7) clamping cooperation.

4. The zero arc-walk device according to any one of claims 1 to 3, characterized in that: The upper end of the arc extinguishing frame (3) is spaced apart and is provided with a plurality of slot openings (32) communicating with the arc chamber (4), and the lower end of the arc extinguishing frame (3) is a closed structure, and a plurality of arc screens (5) are respectively inserted into the arc chamber (4) from a plurality of slot openings (32).

5. The zero arc-walk device according to claim 4, characterized in that: The two side inner walls of the arc chamber (4) are oppositely provided with a plurality of groups of positioning blocks (6) distributed in the interval, and a plurality of groups of positioning grooves (61) for positioning and connecting a plurality of arc screens (5) are formed between the plurality of groups of positioning blocks (6), and the plurality of groups of positioning blocks (6) are arranged in the depth direction of the arc chamber and are arranged on the two side inner walls of the arc chamber (4).

6. The zero arc-walk device according to claim 1, characterized in that: The cover (1) includes the upper baffle (13) arranged on the upper side of the installation slot (2) and the wiring space (14) arranged on the lower side of the installation slot (2), and the lower side of the installation slot (2) is provided with a lower opening for the arc extinguishing frame (3) to be inserted into the installation slot (2), and the upper end of the arc extinguishing frame (3) abuts against the upper baffle (13), and the lower end is accommodated in the lower opening.

7. The zero arc-walk device according to claim 6, characterized in that: The two side inner walls of the installation slot (2) are oppositely provided with a plurality of groups of second plug-in slots (22) for spacing and inserting a plurality of arc screens (5), at least one group of second plug-in slots (22) is arranged in the first plug-in slot (21), and the first plug-in slot (21) and the second plug-in slot (22) are arranged in the same direction to the lower opening.

8. The zero arc-walk device according to claim 1, characterized in that: A foolproof structure is arranged between the installation slot (2) and the arc extinguishing module (a), the foolproof structure includes a foolproof opening (23) arranged at one end of the first plug-in slot (21), and a foolproof block (81) correspondingly arranged at one end of the plug-in strip (8) and matched with the foolproof opening (23), and the width of the foolproof opening (23) is greater than the width of the first plug-in slot (21).

9. The zero arc-walk device according to claim 6, characterized in that: A plurality of circular bosses (15) are arranged on the inner side of the upper baffle (13) at intervals, and a plurality of groups of convex rib structures (16) are connected to the circular bosses (15) respectively.

10. The zero arc-walk device according to claim 9, characterized in that: The cover (1) comprises a plurality of shearing grooves (9) arranged on the upper baffle (13) and a shearing part (91) formed by surrounding the shearing grooves (9), and the two ends of the shearing grooves (9) extend to one side edge of the upper baffle (13).

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