Arc extinguishing system and electrical switch

Abstract

The present invention discloses an arc extinguishing system and an electrical switch, belonging to the technical field of electrical equipment. The two ends of a front arc extinguishing grid group serve as the two ends of a first-stage arc extinguishing system; the two ends of a series-connected or single rear arc extinguishing grid group serve as the two ends of a second-stage arc extinguishing system; the two ends are connected in parallel after being connected to a static arc-strike grid and a dynamic arc-strike grid; the front end of the arc-strike grid group is attached to and inserted between the arc extinguishing grids of the front arc extinguishing grid group, and the rear end is connected to the ends of different rear arc extinguishing grid groups; the total length of the first-stage arc extinguishing system in the arc extinguishing grid thickness direction is less than that of the second-stage arc extinguishing system, and the dynamic arc-strike grid is connected to the moving contact busbar, and the static arc-strike grid is connected to the static contact busbar at the same potential. The present invention can fully utilize the space of the electrical switch and reasonably arrange the arc extinguishing grids, and can also significantly increase the capacity of the arc extinguishing system. On this basis, it can accelerate the arc root transfer speed, shorten the time it takes for the arc to enter the arc extinguishing system, significantly reduce the arc energy, and improve the safety and reliability of the arc extinguishing system.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an arc extinguishing system and an electrical switch. Background Art

[0002] As a key device for controlling the on-off switching of electrical current, the stability and reliability of electrical switches are crucial. During the on-load opening and closing process of an electrical switch, the voltage between the contacts causes discharge in the air, forming an arc. The presence of an arc not only damages the electrical switch itself but can also have serious impacts on connected electrical equipment and the entire power distribution system. Therefore, electrical switches often utilize arc-extinguishing systems consisting of arc-quenching grids. These systems quickly extinguish the arc by cutting and cooling it, ensuring safe operation of the switch.

[0003] As a core component of electrical switches, the performance of the arc extinguishing system directly impacts the switch's arc extinguishing capability and reliability. Especially in high-voltage environments, electrical switches require a more robust arc extinguishing system to interrupt the arc. Currently, air-based electrical switches generally utilize arc extinguishing grids, increasing the number of stacked grids to improve arc extinguishing capability. However, as electrical switches move toward higher voltages, traditional arc extinguishing system layouts face numerous challenges.

[0004] First, traditional arc extinguishing systems often fail to fully utilize the remaining space in electrical switches, resulting in limited capacity increases and an inability to meet the needs of electrical switches in high-voltage environments. Secondly, increasing the capacity of the arc extinguishing system often interferes with other components of the electrical switch, making it difficult to adapt common components and requiring redesign. This not only increases R&D costs and mold costs, but can also lead to a significant increase in raw material costs. In addition, traditional arc extinguishing systems have deficiencies in arc transfer and extinguishing. The arc cannot be quickly transferred from the contacts to the arc extinguishing system, resulting in longer arcing time, increased arc energy, and severe ablation damage to the arc extinguishing system, reducing the reliability and service life of the arc extinguishing system.

[0005] In particular, in universal circuit breaker-type electrical switches, increasing the arc extinguishing system's capacity is typically accomplished by increasing its height and extending the arc extinguishing system beyond the switch housing. However, this approach not only fails to fully utilize the switch's internal space but also increases external space. It also increases the distance between the arc extinguishing grid and the contacts, prolonging the arc's burning time before the grid cuts, hindering rapid arc extinguishing and energy reduction.

[0006] Therefore, how to innovatively design an arc extinguishing system that can fully utilize the space of electrical switches, reasonably arrange arc extinguishing grids, and significantly increase the capacity of the arc extinguishing system has become an important issue that needs to be urgently addressed in the current electrical switch field. Summary of the Invention

[0007] The purpose of the present invention is to provide an arc extinguishing system and an electrical switch to solve the problems existing in the above-mentioned prior art. It can fully utilize the space of the electrical switch and reasonably arrange the arc extinguishing grids, and can also greatly improve the capacity of the arc extinguishing system. On this basis, it can accelerate the arc root transfer speed, shorten the time for the arc to enter the arc extinguishing system, greatly reduce the arc energy, and improve the safety and reliability of the arc extinguishing system.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides an arc extinguishing system, comprising a first-stage arc extinguishing system and a second-stage arc extinguishing system. The first-stage arc extinguishing system comprises a front arc extinguishing grid group, two ends of the front arc extinguishing grid group serving as two ends of the first-stage arc extinguishing system and respectively used to connect a static arc-striking grid and a moving arc-striking grid. The second-stage arc extinguishing system comprises at least one rear arc extinguishing grid group, different rear arc extinguishing grid groups are connected in series via an arc-striking grid group, two ends of the series-connected or single rear arc extinguishing grid group serve as two ends of the second-stage arc extinguishing system and respectively used to connect the static arc-striking grid and the moving arc-striking grid, the front ends of the arc-striking grid groups being attached to and inserted between the arc extinguishing grids of the front arc extinguishing grid group, and the rear ends of the arc-striking grid groups being connected to ends of different rear arc extinguishing grid groups. The total length of the first-stage arc extinguishing system in the arc extinguishing grid thickness direction is smaller than that of the second-stage arc extinguishing system. The moving arc extinguishing grid is used to be connected to a moving contact busbar with equal potential, and the static arc extinguishing grid is used to be connected to a static contact busbar with equal potential.

[0010] In one embodiment, the front arc-quenching grid group is divided into a first section and a second section by the arc-quenching grid group; the rear arc-quenching grid group includes a first arc-quenching grid group and a second arc-quenching grid group, the first arc-quenching grid group is connected in parallel with the first section, and the second arc-quenching grid group is connected in parallel with the second section; the arc-quenching grid group includes a first upper arc-quenching grid and a second lower arc-quenching grid, the front end of the first upper arc-quenching grid and the front end of the second lower arc-quenching grid are affixed to and inserted between the first section and the second section, the rear end of the first upper arc-quenching grid is located at the top end of the first arc-quenching grid group, and the rear end of the second lower arc-quenching grid is located at the bottom end of the second arc-quenching grid group; the static arc-quenching grid is provided at the bottom end of the first arc-quenching grid group, and the dynamic arc-quenching grid is provided at the top end of the second arc-quenching grid group.

[0011] In one embodiment, it further includes a bracket, which separates the arc extinguishing system into a front arc extinguishing chamber and a rear arc extinguishing chamber, the rear arc extinguishing chamber includes a first arc extinguishing chamber and a second arc extinguishing chamber, the bracket includes a first partition plate and a second partition plate, the second partition plate is vertically connected to the arc entrance side of the first partition plate, the two sides of the second partition plate are respectively the front arc extinguishing chamber and the rear arc extinguishing chamber, the two sides of the first partition plate are respectively the first arc extinguishing chamber and the second arc extinguishing chamber; the front arc extinguishing grid plate group is located in the front arc extinguishing chamber, the first arc extinguishing grid plate group is located in the first arc extinguishing chamber, and the second arc extinguishing grid plate group is located in the second arc extinguishing chamber.

[0012] In one embodiment, a first left baffle and a first right baffle are provided on the arc entrance side of the first arc-extinguishing grid group, and a second left baffle and a second right baffle are provided on the arc entrance side of the second arc-extinguishing grid group. The first left baffle and the second spacer cooperate to form a first arc entrance port, and the second right baffle and the second spacer cooperate to form a second arc entrance port.

[0013] In one embodiment, a left front baffle and a right front baffle are provided on both sides of the front arc-quenching grid group, and the left front baffle and the right front baffle have chamfered structures, and the chamfered structures guide the arc-quenching grid gaps of the first section and the second section of the front arc-quenching grid group to the first arc-quenching chamber and the second arc-quenching chamber respectively.

[0014] In one embodiment, a groove structure is provided on the side of the bracket, the first left baffle and the second right baffle facing the front arc extinguishing chamber, and the ends of the arc extinguishing grids in the front arc extinguishing grid group are arranged alternately in length, and the ends of the longer arc extinguishing grids are inserted into the groove structure.

[0015] In one embodiment, the device further includes a guide plate and a diversion plate, wherein the guide plate is arranged at the end of the rear arc-extinguishing grid group, and the diversion plate is arranged on the outside of the guide plate. The diversion plates correspond one-to-one to the rear arc-extinguishing chambers, and the guide plate has a guide hole, and the guide plate has an exhaust port and a diversion slope, and the diversion slope is used to guide the airflow of the guide hole to the exhaust port.

[0016] The present invention also provides an electrical switch, comprising a housing and the arc extinguishing system as described above, wherein the first-stage arc extinguishing system is located inside the housing, and the second-stage arc extinguishing system is located outside the housing. The switch also comprises a static contact busbar and a moving contact busbar, wherein the static contact busbar is connected to the static arc-striking grid at the same potential, and the moving contact busbar is connected to the moving arc-striking grid at the same potential; a left side plate is provided on the left side of the housing, a right side plate is provided on the right side of the housing, a face mask is provided on the front side of the housing, the left side plate is used for installing secondary wiring terminals, and the rear side of the housing is used for installing the moving contact busbar and the static contact busbar.

[0017] In one embodiment, it also includes a connecting plate 1 and a connecting plate 2, the static contact busbar is connected to the static arc-striking grid at the same potential through the connecting plate 1, and the connecting plate 1 and the static arc-striking grid are connected by a detachable equipotential connection screw; the moving contact busbar is connected to the moving arc-striking grid at the same potential through the connecting plate 2, and a connecting bar assembly is also connected between the connecting plate 2 and the moving arc-striking grid, and the connecting plate 2 and the connecting bar assembly are connected by a detachable equipotential connection screw.

[0018] In one embodiment, it also includes a moving contact system, which includes an arc contact and a moving contact cover connected to the arc contact, the arc contact is electrically connected to the moving contact busbar through a flexible wire, the moving contact cover is provided with a slide groove structure, and also includes a moving contact baffle, the moving contact baffle is slidably connected to the slide groove structure, and the moving contact baffle and the moving contact cover are used to isolate the arc when the electrical switch performs an opening and closing action.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The arc extinguishing system of the present invention adopts a multi-stage structural arrangement as a whole, including a first-stage arc extinguishing system placed inside the electrical switch and a second-stage arc extinguishing system arranged on the top of the electrical switch. It can make full use of the space of the electrical switch, greatly improve the capacity of the arc extinguishing system, and improve the ability of the arc extinguishing system to extinguish arcs under high voltage. The arc extinguishing system adopts a dual equipotential structure to accelerate the arc root transfer speed, shorten the time for the arc to enter the arc extinguishing system, greatly reduce the arc energy, and improve the safety and reliability of the arc extinguishing system.

[0021] The electrical switch of the present invention can be improved by using existing electrical switches without changing the overall size of the electrical switch, and the size (such as the size of the main circuit terminals, etc.) and position (such as the position of accessories such as the shunt release, closing release, undervoltage release, auxiliary switch, etc.) of other components. While achieving the purpose of increasing the capacity of the arc extinguishing system and reducing the arc energy, it can also significantly save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a right side view of the electrical switch in the embodiment of the present invention;

[0024] Figure 2This is a front view of an electrical switch in an embodiment of the present invention;

[0025] Figure 3 It is a left side view of the electrical switch in the embodiment of the present invention;

[0026] Figure 4 is a cross-sectional view of an electrical switch according to an embodiment of the present invention;

[0027] Figure 5a is an isometric view of an electrical switch according to an embodiment of the present invention;

[0028] Figure 5b for Figure 5a Enlarged view of Y in the middle;

[0029] Figure 6a Schematic diagram of quick disassembly and assembly of the arc extinguishing system in an embodiment of the present invention;

[0030] Figure 6b for Figure 6a Enlarged view of the middle Z;

[0031] Figure 7 A plan view of the arc extinguishing system and the contact system in an embodiment of the present invention;

[0032] Figure 8 An exploded diagram of the arc extinguishing system in an embodiment of the present invention;

[0033] Figure 9 The arc extinguishing system shaft side in the embodiment of the present invention Figure 1 ;

[0034] Figure 10 The arc extinguishing system shaft side in the embodiment of the present invention Figure 2 ;

[0035] Figure 11 The arc extinguishing system shaft side in the embodiment of the present invention Figure 3 ;

[0036] Figure 12 The arc extinguishing system shaft side in the embodiment of the present invention Figure 4 ;

[0037] Figure 13 This is an isometric view of the arc extinguishing system according to an embodiment of the present invention;

[0038] Figure 14 Figure 6 is the axonometric view of the arc extinguishing system in an embodiment of the present invention;

[0039] Figure 15a This is a front view of the arc extinguishing system in an embodiment of the present invention;

[0040] Figure 15b for Figure 15a Middle CC section view;

[0041] Figure 15c for Figure 15a Middle DD section view;

[0042] Figure 16 This is a structural diagram of the second-stage arc extinguishing system in an embodiment of the present invention;

[0043] Figure 17a Schematic diagram of each arc extinguishing chamber in the embodiment of the present invention Figure 1 ;

[0044] Figure 17b Schematic diagram of each arc extinguishing chamber in the embodiment of the present invention Figure 2 ;

[0045] Figure 18 This is a structural diagram of the first-stage arc extinguishing system in an embodiment of the present invention;

[0046] Figure 19 An exploded view of components in the first arc extinguishing chamber according to an embodiment of the present invention;

[0047] Figure 20 An exploded view of components in the second arc extinguishing chamber according to an embodiment of the present invention;

[0048] Figure 21 Schematic diagram of the structural arrangement and current path of each arc striking grid in an embodiment of the present invention;

[0049] Figure 22 Schematic diagram of the relationship between the connecting bar assembly and the housing in an embodiment of the present invention;

[0050] Figure 23 Schematic diagram of equipotential connection relationship of connecting bar components in an embodiment of the present invention;

[0051] Figure 24 Schematic diagram of the double equipotential connection relationship in an embodiment of the present invention;

[0052] Figure 25a Schematic diagram of the positional relationship of the components of the moving contact system when the electrical switch is in the open state in an embodiment of the present invention;

[0053] Figure 25b for Figure 25a Cross-sectional view;

[0054] Figure 26a Schematic diagram of the positional relationship of the components of the moving contact system when the electrical switch is in the closed state in an embodiment of the present invention;

[0055] Figure 26b for Figure 26a Cross-sectional view;

[0056] Figure 27Schematic diagram of the current when the arc contact and the static arc-starting grid are in the initial contact position during the closing or opening process of the electrical switch in an embodiment of the present invention;

[0057] Figure 28 Schematic diagram of the current and arc path at the initial stage of disconnection of an electrical switch in an embodiment of the present invention;

[0058] Figure 29 Schematic diagram of the current and arc path in the early stage of disconnection of an electrical switch in an embodiment of the present invention;

[0059] Figure 30a Schematic diagram of the current and arc path of the first arc-extinguishing grid group at the end of the disconnection period of the electrical switch in an embodiment of the present invention;

[0060] Figure 30b Schematic diagram of the current and arc path of the second arc-extinguishing grid group at the end of the disconnection period of the electrical switch in an embodiment of the present invention;

[0061] Figure 31 This is a schematic diagram of the layout structure of an electrical switch of a traditional universal circuit breaker structure type;

[0062] Figure 32 Schematic diagram of the layout structure of the electrical switch in an embodiment of the present invention.

[0063] Among them, 1. Arc extinguishing system; 2. Mask; 3. Housing; 4. Right side panel; 5. Stopper; 6. Left side panel; 7. Static contact busbar; 8. Moving contact busbar; 9. Secondary wiring terminal; 10. Moving contact system; 11. Moving contact cover; 12. Moving contact baffle; 16. Connecting bar assembly; 17. Connecting plate 1; 19. Left housing; 20. Right housing; 21. Static arc-striking grid; 22. Static arc-striking silver point; 23. Front arc-striking grid group; 24. Left front baffle; 25. Chamfer structure; 26. First left baffle; 27. First right baffle; 28. First upper arc-striking grid; 29. ​​First arc-striking grid group; 30. Support Frame; 31. Second left baffle; 32. Second right baffle; 33. Moving arc-striking grid; 34. Iron core; 35. V-shaped arc-striking structure; 37. Second lower arc-striking grid; 38. Second arc-extinguishing grid group; 39. Groove structure; 41. Guide plate; 42. Guide hole; 44. Guide plate; 45. Exhaust port; 46. Metal mesh; 47. Drainage slope; 48. Fixed plate; 49. End baffle; 50. Cover; 51. Exhaust hole; 54. Right front baffle; 55. Connecting plate 2; 63. Insert plate; 67. Arc contact; 68. Arc contact silver point; 69. Main contact; 70. Main contact silver point; 71. Static contact.

[0064] For the convenience of description, the following parts or structure names are introduced: 13. Rotating shaft; 14. Push rod; 15. Equipotential connection screw; 40. Arc striking structure; 52. Cylindrical structure; 53. First guide rail structure; 56. Narrow slot structure; 57. First arc entrance; 58. Second arc entrance; 59. Front arc extinguishing chamber; 60. Second arc extinguishing chamber; 61. First arc extinguishing chamber; 62. Equipotential connection point; 65. Second guide rail structure; 66. Slide groove structure; 72. First-stage arc extinguishing system; 73. Second-stage arc extinguishing system. DETAILED DESCRIPTION

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0066] The purpose of the present invention is to provide an arc extinguishing system and an electrical switch to solve the problems existing in the prior art. It can fully utilize the space of the electrical switch and reasonably arrange the arc extinguishing grids, and can also greatly improve the capacity of the arc extinguishing system. On this basis, it can accelerate the arc root transfer speed, shorten the time for the arc to enter the arc extinguishing system, greatly reduce the arc energy, and improve the safety and reliability of the arc extinguishing system.

[0067] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0068] like Figures 1 to 32As shown, the present invention provides an arc extinguishing system, including a first-stage arc extinguishing system 72 and a second-stage arc extinguishing system 73. The first-stage arc extinguishing system 72 and the second-stage arc extinguishing system 73 can be located in different locations, for example, inside and outside the housing 3, respectively, to facilitate the layout of the arc extinguishing system 1. The first-stage arc extinguishing system 72 includes a front arc extinguishing grid group 23. The two ends of the front arc extinguishing grid group 23 serve as the two ends of the first-stage arc extinguishing system 72, respectively used to connect the static arc ignition grid 21 and the dynamic arc ignition grid 33. The second-stage arc extinguishing system 73 includes at least one rear arc extinguishing grid group. By changing the number of arc extinguishing grids connected in series in the second-stage arc extinguishing system 73, different voltage level requirements can be met. When multiple rear arc-quenching grid groups are provided, the different rear arc-quenching grid groups are connected in series via the pilot arc grid group. The two ends of the series-connected rear arc-quenching grid group (when only one rear arc-quenching grid group is provided, the two ends of that arc-quenching grid group) serve as the two ends of the second-stage arc-quenching system 73, respectively used to connect the static pilot arc grid 21 and the dynamic pilot arc grid 33. Thus, the static pilot arc grid 21 and the dynamic pilot arc grid 33 connect the first-stage arc-quenching system 72 and the second-stage arc-quenching system 73 in parallel. The front end of the pilot arc grid group is attached to and inserted between the arc quenching grids of the front arc-quenching grid group 23, and the rear end of the pilot arc grid group is connected to the ends of different rear arc-quenching grid groups. In other words, the front arc-quenching grid group 23 is divided into multiple sections by the pilot arc grid group, and each section is connected in parallel with a different rear arc-quenching grid group. The total length of the first-stage arc-extinguishing system 72, along the arc-extinguishing grid thickness, is less than that of the second-stage arc-extinguishing system 73. This means that, according to the aforementioned arc-extinguishing system 1, the positions and sizes of the first-stage arc-extinguishing system 72 and the second-stage arc-extinguishing system 73 can be flexibly arranged according to the space available for the electrical switch. Furthermore, the moving arc-striking grid 33 is used for equipotential connection with the moving contact busbar 8, and the stationary arc-striking grid 21 is used for equipotential connection with the stationary contact busbar 7, forming a dual equipotential structure.

[0069] The arc extinguishing system 1 of the present invention adopts a multi-stage structural arrangement as a whole, including a first-stage arc extinguishing system 72 placed inside the electrical switch and a second-stage arc extinguishing system 73 arranged on the top of the electrical switch. It can make full use of the space of the electrical switch, greatly improve the capacity of the arc extinguishing system 1, and improve the ability of the arc extinguishing system 1 to extinguish arcs under high voltage. The arc extinguishing system 1 adopts a dual equipotential structure to accelerate the arc root transfer speed, shorten the time for the arc to enter the arc extinguishing system 1, greatly reduce the arc energy, and improve the safety and reliability of the arc extinguishing system 1.

[0070] In one embodiment, the arc extinguishing system 1 is disposed on top of the electrical switch, with at least a portion of the arc extinguishing system 1 located within the electrical switch housing 3. The arc extinguishing system 1 extending outside the housing 3 covers at least two-thirds of the total dimension of the electrical switch faceplate 2 and the housing 3 in the depth direction (the thickness direction of the arc extinguishing grid, hereinafter the same). At least one end of the arc extinguishing system 1 extending outside the housing 3 is aligned with one end of the depth direction of the electrical switch faceplate 2 and the housing 3.

[0071] In one embodiment, the front arc-quenching grid group 23 is divided into a first section and a second section by the arc-quenching grid group. The rear arc-quenching grid group includes a first arc-quenching grid group 29 and a second arc-quenching grid group 38. The first arc-quenching grid group 29 is connected in parallel with the first section, and the second arc-quenching grid group 38 is connected in parallel with the second section. The arc-quenching grid group includes a first upper arc-quenching grid 28 and a second lower arc-quenching grid 37. The front ends of the first upper arc-quenching grid 28 and the front ends of the second lower arc-quenching grid 37 are aligned and inserted between the first and second sections. The rear end of the first upper arc-quenching grid 28 is located at the top of the first arc-quenching grid group 29, and the rear end of the second lower arc-quenching grid 37 is located at the bottom of the second arc-quenching grid group 38. The static arc-quenching grid 21 is provided at the bottom of the first arc-quenching grid group 29, and the dynamic arc-quenching grid 33 is provided at the top of the second arc-quenching grid group 38.

[0072] like Figure 8 、 Figure 17a 、 Figure 17b 、 Figure 19 and Figure 20 As shown, the bent end flat plate of the first upper arc-starting grid 28 is placed above the uppermost arc-stopping grid of the first arc-stopping grid group 29. The bent end flat plate of the second lower arc-starting grid 37 is placed below the lowermost arc-stopping grid of the second arc-stopping grid group 38. The front flat plates of the first upper arc-starting grid 28 and the second lower arc-starting grid 37 are stacked together to form an equipotential connection point 62 and placed in the front arc-stopping grid group 23, dividing the front arc-stopping grid group 23 into two upper and lower grid groups (a first section and a second section). The arc-stopping grids of each divided grid group are respectively the first section and the second section. The arc-stopping grid group in the second-stage arc-stopping system 73 between the arc-starting grids at both ends of the first section forms a parallel structure with the first section, and the arc-stopping grid group in the second-stage arc-stopping system 73 between the arc-starting grids at both ends of the second section forms a parallel structure with the second section. Specifically, the lower plurality of arc-quenching grids of the front arc-quenching grid group 23 and the first arc-quenching grid group 29 form a parallel structure via the static arc-strike grid 21 and the first upper arc-strike grid 28. The upper plurality of arc-quenching grids of the front arc-quenching grid group 23 and the second arc-quenching grid group 38 form a parallel structure via the second lower arc-strike grid 37 and the dynamic arc-strike grid 33. Overall, the first upper arc-strike grid 28 and the second lower arc-strike grid 37 form a series structure between the first arc-quenching grid group 29 and the second arc-quenching grid group 38. This series structure of arc-quenching grids is connected in parallel to the front arc-quenching grid group 23 via the dynamic arc-strike grid 33 and the static arc-strike grid 21.

[0073] In one embodiment, the arc-extinguishing system 1 further includes a bracket 30, which separates the arc-extinguishing system 1 into a front arc-extinguishing chamber 59 and a rear arc-extinguishing chamber. The rear arc-extinguishing chamber includes a first arc-extinguishing chamber 61 and a second arc-extinguishing chamber 60. The bracket 30 includes a first partition plate and a second partition plate. The second partition plate is perpendicularly connected to the arc-entry side of the first partition plate. The second partition plate is flanked by the front arc-extinguishing chamber 59 and the rear arc-extinguishing chamber, respectively. The first partition plate is flanked by the first arc-extinguishing chamber 61 and the second arc-extinguishing chamber 60, respectively. The front arc-extinguishing grid group 23 is located within the front arc-extinguishing chamber 59, the first arc-extinguishing grid group 29 is located within the first arc-extinguishing chamber 61, and the second arc-extinguishing grid group 38 is located within the second arc-extinguishing chamber 60. The first upper arc-starting grid 28 has a bent end extending into the first arc-extinguishing chamber 61. The bent end plate is placed above the uppermost arc-extinguishing grid of the first arc-extinguishing grid group 29. The end of the second lower arc-starting grid 37 is bent and extends to the second arc-extinguishing chamber 60 , and the bent end flat plate is placed under the lowermost arc-extinguishing grid of the second arc-extinguishing grid group 38 .

[0074] like Figure 8 、 Figure 17a and Figure 17b As shown, the arc extinguishing system 1 further includes a left housing 19 and a right housing 20. The bracket 30 divides the internal cavity enclosed by the left and right housings 19, 20 into multiple chambers, including a front arc extinguishing chamber 59 where the front arc extinguishing grid group 23 is located. Furthermore, based on the number of parallel arc extinguishing grid groups in the second-stage arc extinguishing system 73, the second-stage arc extinguishing system 73 is divided into two mutually isolated chambers: a first arc extinguishing chamber 61 where the first arc extinguishing grid group 29 is located, and a second arc extinguishing chamber 60 where the second arc extinguishing grid group 38 is located. The first arc extinguishing chamber 61 and the second arc extinguishing chamber 60 are electrically isolated from each other.

[0075] like Figure 8 、 Figure 17a 、 Figure 17b and Figure 20 As shown, the central flat portion of the movable arc-striking grid 33 is positioned above the topmost arc-striking grid in the front arc-striking grid group 23. The distal end is bent and extends into the second arc-striking chamber 60. The bent distal end is then positioned above the topmost arc-striking grid in the second arc-striking grid group 38. The front flat surface of the movable arc-striking grid 33 has mounting holes that extend to the exterior surfaces of the left and right housings 19 and 20. These mounting holes in the front flat surface of the movable arc-striking grid 33, extending to the exterior surfaces, allow for the installation of a second connecting plate 55, facilitating connection to the equipotential element.

[0076] like Figure 8 、 Figure 17a 、 Figure 17b and Figure 19As shown, the central flat portion of the static arc-strike grid 21 is positioned below the lowest arc-extinguishing grid in the front arc-extinguishing grid group 23. The distal end is bent and extended into the first arc-extinguishing chamber 61. The extended distal flat portion is then positioned below the lowest arc-extinguishing grid in the first arc-extinguishing grid group 29. The static arc-strike grid 21 is provided with a static arc-strike silver point 22, which contacts the arc contact silver point 68 to achieve current conduction.

[0077] In one embodiment, a first left baffle 26 and a first right baffle 27 are provided on the arc entrance side of the first arc-extinguishing grid group 29, and a second left baffle 31 and a second right baffle 32 are provided on the arc entrance side of the second arc-extinguishing grid group 38. The first left baffle 26 and the second partition plate cooperate to form a first arc entrance opening 57, and the second right baffle 32 and the second partition plate cooperate to form a second arc entrance opening 58.

[0078] like Figure 8 、 Figure 16 、 Figure 17a and Figure 17b As shown, the first left baffle 26 and the second right baffle 32 in the second-stage arc-extinguishing system 73 cooperate with the bracket 30 to form a first arc-entry opening 57 and a second arc-entry opening 58, respectively connecting the first arc-extinguishing chamber 61 and the second arc-extinguishing chamber 60 to the front arc-extinguishing chamber 59. It should be noted that when the second-stage arc-extinguishing system 73 uses more than two sets of parallel arc-extinguishing grid groups, the number of arc-entry openings matches the number of parallel arc-extinguishing grid groups.

[0079] In one embodiment, a left front baffle 24 and a right front baffle 54 are provided on both sides of the front arc-quenching grid group 23. The left front baffle 24 and the right front baffle 54 have a chamfered structure 25. The chamfered structure 25 guides the arc-quenching grid gaps of the first section and the second section of the front arc-quenching grid group 23 to the first arc-quenching chamber 61 and the second arc-quenching chamber 60 respectively.

[0080] like Figure 15a 、 Figure 15b 、 Figure 15c and Figure 18 As shown, the left and right front baffles 24 and 54 have chamfered structures 25. These structures 25 direct the arc-quenching grid gaps of the front arc-quenching grid assembly 23 into the first and second arc-quenching openings 57 and 58, respectively. The chamfered structures 25 facilitate the guidance of the arc and high-temperature gas into the second-stage arc-quenching system 73, reducing the arc and high-temperature gas diversion resistance. The number of grid gaps in the front arc-quenching grid assembly 23 can be increased or decreased depending on the number of arc-quenching openings.

[0081] In one embodiment, a groove structure 39 is provided on the side of the bracket 30, the first left baffle 26 and the second right baffle 32 facing the front arc extinguishing chamber 59, and the ends of the arc extinguishing grids in the front arc extinguishing grid group 23 are arranged alternately in length, and the ends of the longer arc extinguishing grids are inserted into the groove structure 39.

[0082] like Figure 8 、 Figure 14 and Figure 16 As shown, the ends of the arc-quenching grids in the front arc-quenching grid group 23 are arranged in long and short intervals. Grooves 39 are provided at the corresponding locations where the bracket 30, the first left baffle 26, and the second right baffle 32 engage with the ends of the front arc-quenching grid group 23. The ends of the longer arc-quenching grids of the front arc-quenching grid group 23 are inserted into the grooves 39. The grooves 39 prevent arcs in the gaps between the arc-quenching grids of the front arc-quenching grid group 23 from escaping outside the guiding direction. They also alter the electric field distribution at the ends of the arc-quenching grids, preventing excessive electric field concentration from causing a short circuit due to strong electric field discharge at the ends of the arc-quenching grids, which could lead to short circuits between the arc-quenching grids and arc-quenching grid failure.

[0083] In one embodiment, it also includes a guide plate 41 and a diverter plate 44. The guide plate 41 is arranged at the end of the rear arc extinguishing grid group, and the diverter plate 44 is arranged on the outside of the guide plate 41. The diverter plates 44 correspond one-to-one to the rear arc extinguishing chambers (for example, the first arc extinguishing chamber 61 and the second arc extinguishing chamber 60). The guide plate 41 has a guide hole 42, and the diverter plate 44 has an exhaust port 45 and a diversion slope 47. The diversion slope 47 is used to guide the airflow of the guide hole 42 to the exhaust port 45. The exhaust port 45 can separately divert the arcs in different arc extinguishing chambers in the second-stage arc extinguishing system 73 to prevent arc short-circuit breakdown with different voltage gradients. The diversion slope 47 can guide the direction of the exhaust air flow in the exhaust port 45, increase the exhaust resistance of the arc extinguishing grid gap corresponding to the first arc inlet 57 and the second arc inlet 58, reduce the exhaust resistance of the arc extinguishing grid gap away from each arc inlet, balance the arc movement speed, and make the arc extinguishing grids of the first arc extinguishing grid group 29 and the second arc extinguishing grid group 38 in the second-stage arc extinguishing system 73 cut the arc synchronously, improve the synchronous utilization rate of the arc extinguishing grid, and prevent the arc extinguishing grid gap facing the arc inlet from ejecting high-energy arc too early, causing the arc to continue to burn at the end of the arc extinguishing grid, resulting in disconnection failure.

[0084] like Figure 8 and Figure 11 As shown, a cover 50 is secured to the top of the arc extinguishing system 1 and features an outlet 51 offset from the exhaust port 45. This prevents molten metal from directly ejecting from the arc extinguishing system 1, fully protecting external power distribution equipment. A metal mesh 46 is positioned within the exhaust port 45 to further dissipate residual arc energy and prevent flashover. An end baffle 49 secures the metal mesh 46, deflector 41, guide plate 44, and cover 50 to the arc extinguishing system 1 using a fixing plate 48.

[0085] like Figures 1 to 32As shown, the present invention also provides an electrical switch, comprising a housing 3 and the arc extinguishing system 1 described above. The first-stage arc extinguishing system 72 is located inside the housing 3, and the second-stage arc extinguishing system 73 is located outside the housing 3. The switch also comprises a static contact busbar 7 and a moving contact busbar 8. The static contact busbar 7 is connected to the static arc-striking grid 21 at the same potential, and the moving contact busbar 8 is connected to the moving arc-striking grid 33 at the same potential. A left side plate 6 is provided on the left side of the housing 3, a right side plate 4 is provided on the right side of the housing 3, and a face shield 2 is provided on the front side of the housing 3. The left side plate 6 is used to mount secondary wiring terminals 9, and the rear side of the housing 3 is used to mount the moving contact busbar 8 and the static contact busbar 7. By changing the layout of the traditional electrical switch, the secondary wiring terminals 9 originally located on the top of the electrical switch are arranged on the side of the electrical switch, that is, mounted on the surface of the left side plate 6. The use of smaller secondary wiring terminals 9 allows the space originally occupied by the secondary wiring terminals 9 to be provided to the arc extinguishing system 1, thereby improving space utilization.

[0086] like Figure 4 As shown, the arc-extinguishing system 1 is placed inside the electrical switch housing 3 and on top of the switch. The arc-extinguishing system 1, located on top of the switch, covers the entire depth of the switch face 2 and housing 3, significantly increasing the number of arc-extinguishing grids within the switch. The arc-extinguishing system 1 utilizes a multi-stage structure, comprising a first-stage arc-extinguishing system 72 located inside the switch housing 3 and a second-stage arc-extinguishing system 73 located on top of the switch.

[0087] like Figure 31 and Figure 32 As shown, compared Figure 31 Electrical switches of traditional universal circuit breaker structure type, and Figure 32 The schematic diagram of the layout structure of the electrical switch in the embodiment of the present invention shows that the arrangement of the arc extinguishing system 1 of the electrical switch in the embodiment of the present invention not only improves the space utilization, but also does not change the overall size of the electrical switch, and can still use common components such as main circuit terminals, shunt releases, closing releases, undervoltage releases, auxiliary switches, etc. The installation method remains unchanged, and does not affect the wiring reliability and convenience of the main circuit terminals. There is no need to increase additional mold costs and material costs, which greatly saves costs.

[0088] like Figure 8 、 Figure 17a 、 Figure 17b and Figure 20As shown, a V-shaped arc-striking structure 35 can be provided between the central flat portion and the front flat surface of the movable arc-striking grid 33. This allows the arc to quickly jump from the surface of the arc contact 67 to the movable arc-striking grid 33 when the electrical switch is opened and the arc contact 67 is opened. This reduces arc erosion of the arc contact 67, increases the service life of the arc contact 67, and shortens the time it takes for the arc to enter the arc extinguishing system 1. An iron core 34 can be added to the V-shaped arc-striking structure 35 to increase the thermal capacity at the location of the V-shaped arc-striking structure 35 and improve the arc erosion resistance of the V-shaped arc-striking structure 35. The second lower arc-striking grid 37 is provided with an arc-striking structure 40, which facilitates the introduction of the arc into the second lower arc-striking grid 37 and the entry of the arc into the second arc-extinguishing grid group 38 along the path.

[0089] In one embodiment, the device further includes a first connecting plate 17 and a second connecting plate 55. The static contact busbar 7 is connected to the static arc-striking grid 21 at the same potential via the first connecting plate 17. The first connecting plate 17 and the static arc-striking grid 21 are connected via detachable equipotential connection screws 15. The moving contact busbar 8 is connected to the moving arc-striking grid 33 at the same potential via the second connecting plate 55. A connecting bar assembly 16 is further connected between the second connecting plate 55 and the moving arc-striking grid 33. The second connecting plate 55 and the connecting bar assembly 16 are connected via detachable equipotential connection screws 15.

[0090] like Figure 5a 、 Figure 5b 、 Figure 6a 、 Figure 6b and Figure 24 As shown, when the arc extinguishing system 1 is repeatedly connected and disconnected and needs to be replaced or maintained, the arc extinguishing system 1 can be removed from the electrical switch by simply removing the stopper 5 and the equipotential connection screws 15 and other surface fixing screws without removing other components, thus enabling quick maintenance of the arc extinguishing system 1. During installation, the equipotential connection screws 15 can also be used to quickly achieve a double equipotential connection between the arc extinguishing system 1 and the electrical switch, providing a simple and reliable connection method.

[0091] like Figure 7 、 Figure 22 、 Figure 23 and Figure 24As shown, the arc extinguishing system 1 adopts a dual equipotential structure, that is, the static contact busbar 7 is equipotentially connected to the static arc-striking grid 21 through the connecting plate 1 17, and the moving contact busbar 8 is equipotentially connected to the moving arc-striking grid 33 through the connecting bar assembly 16 and the connecting plate 2 55. The connecting bar assembly 16 is placed inside the side of the electrical switch housing 3, and the redundant parts are electrically isolated using the plug-in plate 63. The equipotential connection structure can promote the rapid transfer of the arc root, shorten the time for the arc to transfer from the arc contact 67 to the moving arc-striking grid 33, and at the same time increase the speed of the arc moving on the surface of the moving arc-striking grid 33 and the static arc-striking grid 21, so that the arc quickly enters the front arc-striking grid group 23, shortening the time from arc generation to the intervention of the arc-striking grid, and can quickly suppress the arc energy, making the arc easier to extinguish. At the same time, the amount of metal vapor and metal particles generated by arcing between the arc contact 67 and the V-shaped arc-strike structure 35 is greatly reduced, thereby improving the electrical life of the arc contact 67 and the V-shaped arc-strike structure 35; on the other hand, the reduction of metal vapor and metal particles can effectively improve the dielectric properties of the surface of the insulating material in the arc extinguishing system 1, thereby ensuring the dielectric properties after the electrical switch is disconnected.

[0092] In one embodiment, it also includes a moving contact system 10, which includes an arc contact 67 and a moving contact cover 11 connected to the arc contact 67. The arc contact 67 is electrically connected to the moving contact busbar 8 through a flexible wire. The moving contact cover 11 is provided with a slide structure 66 and also includes a moving contact baffle 12. The moving contact baffle 12 is slidably connected to the slide structure 66. The moving contact baffle 12 and the moving contact cover 11 are used to isolate the arc when the electrical switch is opening and closing.

[0093] like Figure 25a 、 Figure 25b 、 Figure 26a and Figure 26b As shown, the moving contact system 10 has a moving contact cover 11, and a moving contact baffle 12 is provided on the surface of the moving contact cover 11. The protrusions on both sides of the moving contact baffle 12 can slide freely in the slide groove structure 66 of the moving contact cover 11, with the central axis of rotation of the moving contact system 10 as the axis. The surface of the moving contact baffle 12 is a cylindrical structure 52 with the central axis of rotation of the moving contact system 10 as the axis, which can be aligned with the cylindrical structure 52 of the arc extinguishing system 1 housing. The moving contact baffle 12 has a second guide rail structure 65, which can cooperate with the first guide rail structure 53 of the arc extinguishing system 1 housing. While maintaining alignment with the arc extinguishing system 1, the moving contact baffle 12 can rotate around the central axis of rotation of the moving contact system 10, preventing the arc generated in the narrow gap structure 56 from entering the space between the main contact 69 and the static contact busbar 7, ensuring that the arc is only generated between the arc contact 67 and the static arc-starting grid 21.

[0094] like Figures 27 to 29 As shown, the main contact 69 is provided with a main contact silver point 70, and the static contact busbar 7 is provided with a static contact point 71 corresponding to the main contact silver point 70. Figure 4As shown, a rotating shaft 13 is connected to the operating handle, and the operating handle is connected to the moving contact system 10 through a push rod 14. When opening and closing the switch, the push rod 14 can be used to drive the moving contact system 10 by pushing the operating handle. At this time, the operating handle rotates around the rotating shaft 13.

[0095] When the switch is opened, the upper part of the moving contact baffle 12 is limited by the housing 3 of the electrical switch, and the moving contact baffle 12 rotates relative to the moving contact cover 11 in the direction away from the arc contact 67, ultimately ensuring that the switch is opened in place and the moving contact cover 11 and the moving contact baffle 12 are used to block the arc (such as Figure 25a and Figure 25b status shown).

[0096] When the closing action is performed, the lower part of the moving contact baffle 12 is limited by the connecting plate 17, and the moving contact baffle 12 rotates relative to the moving contact cover 11 in the direction close to the arc contact 67, and finally ensures that the closing is in place (such as Figure 26a and Figure 26b shown).

[0097] The moving contact baffle 12 and the moving contact cover 11 can isolate the arc generated in the narrow gap structure 56 when the electrical switch is opening and closing, preventing the arc from contacting the main contact 69 and the static contact busbar 7, thereby preventing the main contact 69 and the static contact busbar 7 from causing breakdown due to the arc. At the same time, they can prevent the high-pressure and high-temperature gas in the narrow gap structure 56 from moving toward the main contact 69, promoting the gas blowing effect to push the arc toward the arc extinguishing chamber, thereby improving the gas blowing effect.

[0098] The working principle of the present invention is as follows:

[0099] Take the breaking process as an example.

[0100] Figure 27 This is a schematic diagram of the current path of the electrical switch just before the switch is opened.

[0101] At this time, the arc contact silver point 68 on the arc contact 67 is still in contact with the static arc striking silver point 22 of the static arc striking grid 21, and the relative position of the moving contact baffle 12 and the moving contact cover 11 is Figure 26a and Figure 26b As shown, the current path is: moving contact busbar 8 → arcing contact 67 → static arc-striking grid 21 → connecting plate 17 → static contact busbar 7.

[0102] Figure 28 Schematic diagram of the current and arc path at the initial stage of disconnection.

[0103] At this point, the electrical switch is disconnected, and an arc is generated between the arc contact 67 and the static arc-striking grid 21, within the narrow gap structure 56. Because the moving arc-striking grid 33, arc contact 67, and moving contact busbar 8 are connected at the same potential, the arc is more easily transferred from the arc contact 67 to the moving arc-striking grid 33, reducing arc erosion of the arc contact 67 and the arc-striking resistance on the surface of the moving arc-striking grid 33. The current path quickly changes from: moving contact busbar 8 → arc contact 67 → static arc-striking grid 21 → connecting plate 1 17 → static contact busbar 7 to: moving contact busbar 8 → connecting bar assembly 16 → connecting plate 2 55 → moving arc-striking grid 33 → static arc-striking grid 21 → connecting plate 1 17 → static contact busbar 7. Since the static arc-striking grid 21 and the static contact busbar 7 are also connected at the same potential, the arc-striking resistance on the surface of the static arc-striking grid 21 is reduced, so that the arc moves quickly into the arc extinguishing system 1 along the moving arc-striking grid 33 and the static arc-striking grid 21.

[0104] At the same time, due to the blocking effect of the moving contact baffle 12 and the moving contact cover 11, the gas is prevented from overflowing, so that the gas blowing effect pushes the arc into the arc extinguishing system 1 and accelerates the movement of the arc.

[0105] Figure 29 Schematic diagram of current and arc path in the early stage of disconnection.

[0106] The arc, drawn by the dynamic arc-striking grid 33 and the static arc-striking grid 21, quickly enters the front arc-extinguishing grid set 23. The arc energy is significantly reduced by the arc-extinguishing grids' deionizing action. Because the electrical switch is disconnected, the arc-extinguishing grids intervene at the earliest stage of arc generation, shortening their intervention time. This quickly suppresses the arc energy, reduces the arc's impact on the arc-extinguishing system 1, and creates favorable conditions for subsequent arc extinguishing.

[0107] Figure 30a Schematic diagram of the current and arc path at the end of the interruption of the first arc-extinguishing grid group 29; Figure 30b Schematic diagram of the current and arc path at the end of the interruption of the second arc-extinguishing grid group 38.

[0108] like Figure 30a and Figure 15c As shown, after the arc flows through the front arc-extinguishing grid group 23, the arc in the lower part (second section) is drawn by the static arc-strike grid 21 and the first upper arc-strike grid 28, enters the first arc-extinguishing grid group 29, and is cut and cooled by each arc-extinguishing grid.

[0109] like Figure 30b and Figure 15b As shown, after the arc flows through the front arc-extinguishing grid group 23, the upper part (first section) of the arc enters the second arc-extinguishing grid group 38 under the traction of the movable arc-strike grid 33 and the second lower arc-strike grid 37, and is cut and cooled by each arc-extinguishing grid.

[0110] Since there are a large number of arc extinguishing grids in the first arc extinguishing grid group 29 and the second arc extinguishing grid group 38, and the arc extinguishing grids are connected in series under the action of the arc striking grids, such as Figure 21 As shown in Figure 1, the arc is cut and cooled by the large number of arc-extinguishing grids connected in series, causing the voltage to rise rapidly. After being extinguished by the first-stage arc-extinguishing system 72, the arc enters the second-stage arc-extinguishing system 73, where it is again extinguished by a large number of arc-extinguishing grids. The arc energy is rapidly reduced, and the arc is extinguished. Due to the significant increase in the number of arc-extinguishing grids connected in series, the electrical switch can be disconnected at a higher voltage, thereby increasing the operating voltage of the electrical switch.

[0111] The residual arc and high temperature gas in the gap of the arc extinguishing grid pass through the guide holes 42 of the guide plate 41, where their energy is reduced again and the residual arc is prevented from short-circuiting and breaking down. The airflow passes through the guide slope 47 of the guide plate 44 and is filtered by the metal mesh 46 before being discharged. The airflow direction is as follows: Figure 30a and Figure 30b As shown in the figure, under the action of the guide slope 47, the exhaust resistance is greater at the position directly opposite the first arc inlet 57 and the guide slope 47, while the exhaust resistance is smaller at the position away from the arc inlet. This makes the airflow more balanced, prevents the arc from being directly discharged from the arc extinguishing gap directly opposite the arc inlet, improves the synchronization of the arc cutting by the arc extinguishing grid, and improves the grid utilization rate.

[0112] Finally, the gas is discharged from the gas outlet 51 of the housing 50. After multiple drainage and filtration by the guide holes 42, the drainage slope 47, the metal mesh 46 and the housing 50, the residual arc is completely eliminated, achieving zero arcing.

[0113] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An arc extinguishing system, characterized in that: include: A first-stage arc extinguishing system, wherein the first-stage arc extinguishing system includes a front arc extinguishing grid group, and two ends of the front arc extinguishing grid group serve as two ends of the first-stage arc extinguishing system, respectively used to connect a static arc-striking grid and a dynamic arc-striking grid; and a second-stage arc extinguishing system, the second-stage arc extinguishing system comprising at least one group of rear arc-extinguishing grids, wherein different rear arc-extinguishing grids are connected in series via an arc-starting grid group, and two ends of the series-connected or single rear arc-extinguishing grid group serve as two ends of the second-stage arc extinguishing system, respectively used to connect the static arc-starting grid and the dynamic arc-starting grid, the front end of the arc-starting grid group being attached to and inserted between the arc-extinguishing grids of the front arc-extinguishing grid group, and the rear end of the arc-starting grid group being connected to the ends of different rear arc-extinguishing grid groups; The total length of the first-stage arc extinguishing system in the thickness direction of the arc extinguishing grid is smaller than that of the second-stage arc extinguishing system, the movable arc-striking grid is used for equipotential connection with the movable contact busbar, and the static arc-striking grid is used for equipotential connection with the static contact busbar; The front arc-extinguishing grid group is divided into a first section and a second section by the arc-strike grid group; the rear arc-extinguishing grid group includes a first arc-extinguishing grid group and a second arc-extinguishing grid group, the first arc-extinguishing grid group is connected in parallel with the first section, and the second arc-extinguishing grid group is connected in parallel with the second section; the arc-strike grid group includes a first upper arc-strike grid and a second lower arc-strike grid, the front end of the first upper arc-strike grid and the front end of the second lower arc-strike grid are attached to and inserted between the first section and the second section, the rear end of the first upper arc-strike grid is located at the top end of the first arc-extinguishing grid group, and the rear end of the second lower arc-strike grid is located at the bottom end of the second arc-extinguishing grid group; the static arc-strike grid is provided at the bottom end of the first arc-extinguishing grid group, and the dynamic arc-strike grid is provided at the top end of the second arc-extinguishing grid group; The arc extinguishing system further includes a bracket, the bracket separating the arc extinguishing system into a front arc extinguishing chamber and a rear arc extinguishing chamber, the rear arc extinguishing chamber including a first arc extinguishing chamber and a second arc extinguishing chamber, the bracket including a first partition plate and a second partition plate, the second partition plate being vertically connected to the arc entrance side of the first partition plate, the front arc extinguishing chamber and the rear arc extinguishing chamber being located on either side of the second partition plate, and the first arc extinguishing chamber and the second arc extinguishing chamber being located on either side of the first partition plate; the front arc extinguishing grid group being located in the front arc extinguishing chamber, the first arc extinguishing grid group being located in the first arc extinguishing chamber, and the second arc extinguishing grid group being located in the second arc extinguishing chamber; A first left baffle and a first right baffle are provided on the arc entrance side of the first arc-extinguishing grid group, and a second left baffle and a second right baffle are provided on the arc entrance side of the second arc-extinguishing grid group. The first left baffle and the second spacer cooperate to form a first arc entrance opening, and the second right baffle and the second spacer cooperate to form a second arc entrance opening.

2. The arc extinguishing system according to claim 1, characterized in that: A left front baffle and a right front baffle are provided on both sides of the front arc-extinguishing grid group. The left front baffle and the right front baffle have chamfered structures. The chamfered structures guide the gaps between the arc-extinguishing grids of the first section and the second section of the front arc-extinguishing grid group into the first arc-extinguishing chamber and the second arc-extinguishing chamber, respectively.

3. The arc extinguishing system according to claim 1, characterized in that: A groove structure is provided on the side of the bracket, the first left baffle and the second right baffle facing the front arc extinguishing chamber. The ends of the arc extinguishing grids in the front arc extinguishing grid group are arranged alternately in length, and the ends of the longer arc extinguishing grids are inserted into the groove structure.

4. The arc extinguishing system according to claim 1, characterized in that: It also includes a guide plate and a diversion plate, wherein the guide plate is arranged at the end of the rear arc-extinguishing grid group, and the diversion plate is arranged on the outside of the guide plate. The diversion plates correspond one-to-one to the rear arc-extinguishing chambers, and the guide plate has a guide hole, and the guide plate has an exhaust port and a diversion slope, and the diversion slope is used to guide the airflow of the guide hole to the exhaust port.

5. An electrical switch, characterized in that: It includes a shell and an arc extinguishing system as described in any one of claims 1 to 4, wherein the first-stage arc extinguishing system is located inside the shell, and the second-stage arc extinguishing system is located outside the shell, and also includes a static contact busbar and a moving contact busbar, the static contact busbar is connected to the static arc-striking grid at the same potential, and the moving contact busbar is connected to the moving arc-striking grid at the same potential; a left side plate is provided on the left side of the shell, a right side plate is provided on the right side of the shell, and a mask is provided on the front side of the shell, the left side plate is used for installing secondary wiring terminals, and the rear side of the shell is used for installing the moving contact busbar and the static contact busbar.

6. The electrical switch according to claim 5, characterized in that: It also includes connecting plate 1 and connecting plate 2, the static contact busbar is connected to the static arc-striking grid at the same potential through the connecting plate 1, and the connecting plate 1 and the static arc-striking grid are connected by detachable equipotential connection screws; the moving contact busbar is connected to the moving arc-striking grid at the same potential through the connecting plate 2, and a connecting bar assembly is further connected between the connecting plate 2 and the moving arc-striking grid, and the connecting plate 2 and the connecting bar assembly are connected by detachable equipotential connection screws.

7. The electrical switch according to claim 5, characterized in that: It also includes a moving contact system, which includes an arc contact and a moving contact cover connected to the arc contact. The arc contact is electrically connected to the moving contact busbar through a flexible wire. The moving contact cover is provided with a slide structure and also includes a moving contact baffle. The moving contact baffle is slidably connected to the slide structure. The moving contact baffle and the moving contact cover are used to isolate the arc when the electrical switch is opening and closing.

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