Arc extinguishing system and electric appliance switch

Abstract

The invention discloses an arc extinguishing system and an electric appliance switch, and belongs to the technical field of electric appliance equipment. Two ends of a front arc extinguishing grid plate group serve as two ends of a first-stage arc extinguishing system; the two ends of the serially connected or single rear arc extinguishing grid plate group are used as the two ends of the second-stage arc extinguishing system; the static arc striking grid plate and the movable arc striking grid plate are respectively connected and then are connected in parallel; the front ends of the arc striking grid sheet groups are attached and inserted between the arc extinguishing grid sheets of the front arc extinguishing grid sheet group, and the rear ends of the arc striking grid sheet groups are connected to the end parts of different rear arc extinguishing grid sheet groups; the total length of the first-stage arc extinguishing system in the thickness direction of the arc extinguishing grid plates is smaller than that of the second-stage arc extinguishing system, the movable arc striking grid plates are in equipotential connection with the movable contact busbar, and the static arc striking grid plates are in equipotential connection with the static contact busbar. The space of an electric appliance switch can be fully utilized, the arc extinguishing grid sheets are reasonably arranged, the capacity of an arc extinguishing system can be greatly improved, on the basis, the arc root transfer speed of an electric arc is increased, the time for the electric arc to enter the arc extinguishing system is shortened, the energy of the electric arc is greatly reduced, and the safety and reliability of the arc extinguishing system are improved.

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 and off of current, the stability and reliability of the performance of electrical switches are of vital importance. During the on-load opening and closing process of electrical switches, the air medium will discharge due to the voltage between the contacts, thus forming an arc. The existence of arcs will not only damage the electrical switch itself, but may also have a serious impact on the connected electrical equipment and the entire power distribution system. Therefore, arc extinguishing systems composed of arc extinguishing grids are often used in electrical switches to quickly extinguish arcs by cutting and cooling the arcs, ensuring the safe operation of the electrical switches.

[0003] As the core component of electrical switches, the performance of the arc extinguishing system directly affects the arc extinguishing capability and reliability of electrical switches. Especially in high voltage environments, electrical switches require a more powerful arc extinguishing system to interrupt the arc. At present, electrical switches using air as the medium generally use arc extinguishing systems composed of arc extinguishing grids, and the arc extinguishing capability is improved by increasing the number of stacked arc extinguishing grids. However, as electrical switches develop towards high voltage, the traditional arrangement of arc extinguishing systems faces many challenges.

[0004] First, traditional arc extinguishing systems often cannot make full use of the remaining space of electrical switches, resulting in limited capacity increase effects and failure to meet the needs of electrical switches in high-voltage environments. Secondly, after increasing the capacity of the arc extinguishing system, it often interferes with other components of the electrical switch, making it difficult to adapt general components and requiring redesign. This not only increases R&D costs and mold costs, but may 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 contact 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] Especially in the electrical switches of the universal circuit breaker structure type, the way to increase the capacity of the arc extinguishing system is usually to increase the height of the arc extinguishing system and expand the arc extinguishing system that is higher than the electrical switch housing. However, this method not only fails to make full use of the internal space of the electrical switch, but also may increase the occupation of the external space, while increasing the distance between the arc extinguishing grid and the contact, prolonging the arc burning time before the arc extinguishing grid is cut, which is not conducive to the rapid extinction of the arc and the reduction of energy.

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

[0007] The object 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, which can not only make full use of the space of the electrical switch and reasonably arrange the arc extinguishing grids, but also greatly improve the capacity of the arc extinguishing system, and on this basis, 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, wherein the first-stage arc extinguishing system comprises 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, and are respectively used to connect a static arc-striking grid and a dynamic arc-striking grid; the second-stage arc extinguishing system comprises at least one group of rear arc extinguishing grid groups, and different rear arc extinguishing grid groups are connected in series through an arc-striking 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, and are respectively used to connect the static arc-striking grid and the dynamic arc-striking grid, and the front end of the arc-striking grid group is attached to and inserted between the arc extinguishing grids of the front arc extinguishing grid group, and the rear end of the arc-striking grid group 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-striking grid is used to be connected to the moving contact busbar with equal potential, and the static arc-striking grid is used to be connected to the static contact busbar with equal potential.

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

[0011] In one embodiment, it also 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 entry 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 opening, and the second right baffle and the second spacer cooperate to form a second arc entrance opening.

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

[0014] In one embodiment, a groove structure is provided on one side of the bracket, the first left baffle plate and the second right baffle plate 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 long and short order, and the ends of the longer arc extinguishing grids are inserted into the groove structure.

[0015] In one embodiment, 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, and the diversion plates correspond one by 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 an 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, and further 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 connecting 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 connecting 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 is opening and closing.

[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 double equipotential structure to accelerate the transfer speed of the arc root, 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 the 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 greatly 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

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

[0024] Figure 2A 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 It is an isometric view of an electrical switch in an embodiment of the present invention;

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

[0029] Figure 6a A schematic diagram of quick disassembly and assembly of an 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 It is a plan view of the arc extinguishing system and the contact system in the embodiment of the present invention;

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

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

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

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

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

[0037] Fig.13 A fifth is an axonometric view of an arc extinguishing system in an embodiment of the present invention;

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

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

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

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

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

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

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

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

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

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

[0048] Fig.21 A schematic diagram of the structural arrangement and current path of each arc-starting grid in an embodiment of the present invention;

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

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

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

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

[0053] Fig.25b for Fig.25a Sectional view;

[0054] Fig.26a Schematic diagram of the position relationship of the components of the moving contact system when the electrical switch is in a closed state in an embodiment of the present invention; Figure 26b for Fig.26a Sectional view;

[0055] Fig. 27 It is a schematic diagram of the current when the arc contact and the static arc-starting grid are in the initial contact position state during the closing or opening process of the electrical switch in the embodiment of the present invention;

[0056] Fig.28 A 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;

[0057] Fig.29 A 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;

[0058] Fig.30a A schematic diagram of the current and arc path of the first arc-extinguishing grid group at the end of the disconnection of the electrical switch in an embodiment of the present invention;

[0059] Fig.30b A schematic diagram of the current and arc path of the second arc-extinguishing grid group at the end of the disconnection of the electrical switch in an embodiment of the present invention;

[0060] Fig.31 It is a schematic diagram of the layout structure of an electrical switch of a traditional universal circuit breaker structure type;

[0061] Fig.32 Schematic diagram of the layout structure of the electrical switch in the embodiment of the present invention.

[0062] Among them, 1. arc extinguishing system; 2. mask; 3. shell; 4. right side plate; 5. stopper; 6. left side plate; 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 shell; 20. right shell; 21. static arc-starting grid; 22. static arc-starting silver point; 23. front arc-extinguishing grid group; 24. left front baffle; 25. chamfer structure; 26. first left baffle; 27. first right baffle; 28. first upper arc-starting grid; 29. ​​first arc-extinguishing 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. guide slope; 48. fixed plate; 49. end baffle; 50. cover; 51. air outlet; 54. right front baffle; 55. connecting plate 2; 63. plug-in plate; 67. arc contact; 68. arc contact silver point; 69. main contact; 70. main contact silver point; 71. static contact.

[0063] 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 gap structure; 57. first arc entrance port; 58. second arc entrance port; 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

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0065] 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. The system can fully utilize the space of the electrical switch and reasonably arrange the arc extinguishing grids, and can greatly improve the capacity of the arc extinguishing system. On this basis, the arc root transfer speed can be accelerated, the time for the arc to enter the arc extinguishing system can be shortened, the arc energy can be greatly reduced, and the safety and reliability of the arc extinguishing system can be improved.

[0066] 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.

[0067] like Figure 1 to Figure 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 positions, for example, respectively located inside and outside the housing 3, so as to facilitate the arrangement of the arc extinguishing system 1. The first-stage arc extinguishing system 72 includes a front arc extinguishing grid group 23, and the two ends of the front arc extinguishing grid group 23 are used as the two ends of the first-stage arc extinguishing system 72, respectively for connecting the static arc-striking grid 21 and the dynamic arc-striking grid 33. The second-stage arc extinguishing system 73 includes at least one group of rear arc extinguishing grid groups. By changing the number of arc extinguishing grids in series in the second-stage arc extinguishing system 73, different voltage level requirements can be met. When multiple groups of rear arc-extinguishing grid groups are provided, different rear arc-extinguishing grid groups are connected in series through the arc-striking grid group, and the two ends of the series-connected rear arc-extinguishing grid group (when only one group of rear arc-extinguishing grid groups is provided, the two ends of the arc-extinguishing grid group) serve as the two ends of the second-stage arc-extinguishing system 73, and are respectively used to connect the static arc-striking grid 21 and the dynamic arc-striking grid 33, thereby, the static arc-striking grid 21 and the dynamic arc-striking grid 33 connect the first-stage arc-extinguishing system 72 and the second-stage arc-extinguishing system 73 in parallel. The front end of the arc-striking grid group is attached to and inserted between the arc-extinguishing grids of the front arc-extinguishing grid group 23, and the rear end of the arc-striking grid group is connected to the ends of different rear arc-extinguishing grid groups, that is, the front arc-extinguishing grid group 23 is divided into multiple sections by the arc-striking grid group, and each section is connected in parallel with different rear arc-extinguishing grid groups. The total length of the first-stage arc extinguishing system 72 in the arc extinguishing grid thickness direction is smaller than that of the second-stage arc extinguishing system 73. That is, according to the aforementioned arc extinguishing system 1, the position and size of the first-stage arc extinguishing system 72 and the second-stage arc extinguishing system 73 can be flexibly set according to the space of the electrical switch. In addition, the moving arc-striking grid 33 is used to be connected to the moving contact busbar 8 with equal potential, and the static arc-striking grid 21 is used to be connected to the static contact busbar 7 with equal potential, forming a double equipotential structure.

[0068] The arc extinguishing system 1 of the present invention adopts a multi-stage structure 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 double equipotential structure to accelerate the transfer speed of the arc root, 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.

[0069] In one embodiment, the arc extinguishing system 1 is arranged on the top of the electrical switch, and the arc extinguishing system 1 is at least partially placed inside the electrical switch housing 3. The arc extinguishing system 1 extends to the outside of the housing 3, and at least covers two-thirds of the total size of the electrical switch cover 2 and the housing 3 in the depth direction (the thickness direction of the arc extinguishing grid, the same below). At least one end of the arc extinguishing system 1 extending to the outside of the housing 3 is aligned with one end of the depth direction of the electrical switch cover 2 and the housing 3.

[0070] In one embodiment, the front arc-extinguishing grid group 23 is divided into a first section and a second section by the arc-striking grid group. The rear arc-extinguishing grid group includes a first arc-extinguishing grid group 29 and a second arc-extinguishing grid group 38, the first arc-extinguishing grid group 29 is connected in parallel with the first section, and the second arc-extinguishing grid group 38 is connected in parallel with the second section. The arc-striking grid group includes a first upper arc-striking grid 28 and a second lower arc-striking grid 37, the front end of the first upper arc-striking grid 28 and the front end of the second lower arc-striking grid 37 are attached and inserted between the first section and the second section, the rear end of the first upper arc-striking grid 28 is located at the top of the first arc-extinguishing grid group 29, and the rear end of the second lower arc-striking grid 37 is located at the bottom of the second arc-extinguishing grid group 38. The bottom end of the first arc-extinguishing grid group 29 is provided with a static arc-striking grid 21, and the top end of the second arc-extinguishing grid group 38 is provided with a dynamic arc-striking grid 33.

[0071] like Figure 8 , Fig.17a , Fig.17b , Fig.19 and Fig. 20 As shown, the bent end plate of the first upper arc-striking grid 28 is placed on the upper part of the uppermost arc-striking grid of the first arc-extinguishing grid group 29. The bent end plate of the second lower arc-striking grid 37 is placed on the lower part of the lowermost arc-striking grid of the second arc-extinguishing grid group 38. The front end plate parts of the first upper arc-striking grid 28 and the second lower arc-striking grid 37 are stacked together to form an equipotential connection point 62 and are placed in the front arc-extinguishing grid group 23, dividing the front arc-extinguishing grid group 23 into two upper and lower grid groups (first section and second section), and the arc-extinguishing grids of each grid group after division are respectively the first section and the second section, and the arc-extinguishing grid group in the second-stage arc-extinguishing system 73 between the arc-striking grids at both ends of the first section forms a parallel structure with the first section, and the arc-extinguishing grid group in the second-stage arc-extinguishing system 73 between the arc-striking grids at both ends of the second section forms a parallel structure with the second section. That is, the plurality of arc-extinguishing grids at the bottom of the front arc-extinguishing grid group 23 and the first arc-extinguishing grid group 29 form a parallel structure through the static arc-striking grid 21 and the first upper arc-striking grid 28; the plurality of arc-extinguishing grids at the top of the front arc-extinguishing grid group 23 and the second arc-extinguishing grid group 38 form a parallel structure through the second lower arc-striking grid 37 and the moving arc-striking grid 33. In general, the first upper arc-striking grid 28 and the second lower arc-striking grid 37 make the first arc-extinguishing grid group 29 and the second arc-extinguishing grid group 38 form a series structure. The arc-extinguishing grid group of this series structure is connected in parallel with the front arc-extinguishing grid group 23 through the moving arc-striking grid 33 and the static arc-striking grid 21.

[0072] In one embodiment, the bracket 30 is further included. The bracket 30 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 vertically connected to the arc-entry side of the first partition plate. The two sides of the second partition plate are the front arc extinguishing chamber 59 and the rear arc extinguishing chamber, respectively. The two sides of the first partition plate are the first arc extinguishing chamber 61 and the second arc extinguishing chamber 60, respectively. The front arc extinguishing grid group 23 is located in the front arc extinguishing chamber 59, the first arc extinguishing grid group 29 is located in the first arc extinguishing chamber 61, and the second arc extinguishing grid group 38 is located in the second arc extinguishing chamber 60. The end of the first upper arc-starting grid 28 is bent and extended to the first arc extinguishing chamber 61. The bent end flat plate is placed on the upper part of the uppermost arc extinguishing grid of the first arc extinguishing grid group 29. The end of the second lower arc-striking 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 .

[0073] like Figure 8 , Fig.17a and Fig.17b As shown, the arc extinguishing system 1 further includes a left shell 19 and a right shell 20, and the bracket 30 divides the internal cavity surrounded by the left shell 19 and the right shell 20 into a plurality of chambers, including a front arc extinguishing chamber 59 where the front arc extinguishing grid group 23 is located, and according to the number of parallel arc extinguishing grid groups of the second-stage arc extinguishing system 73, the second-stage arc extinguishing system 73 is divided into two mutually isolated chambers, including 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.

[0074] like Figure 8 , Fig.17a , Fig.17b and Fig. 20 As shown, the middle flat plate portion of the moving arc-striking grid 33 is placed on the upper part of the uppermost arc-striking grid of the front arc-striking grid group 23, and the end is bent and extended to the second arc-striking chamber 60. The bent end flat plate is placed on the upper part of the uppermost arc-striking grid of the second arc-striking grid group 38. The front end plane of the moving arc-striking grid 33 has a mounting hole structure and extends to the outer surface of the left shell 19 and the right shell 20. The front end plane mounting hole of the moving arc-striking grid 33 extending to the outer surface can be installed with the connecting plate 2 55, which is convenient for connection with the equipotential member.

[0075] like Figure 8 , Fig.17a , Fig.17b and Fig.19As shown, the middle flat plate portion of the static arc-striking grid 21 is placed at the bottom of the lowest arc-striking grid of the front arc-striking grid group 23, and the end is bent and extended to the first arc-striking chamber 61. The extended end flat plate is placed at the bottom of the lowest arc-striking grid of the first arc-striking grid group 29. The static arc-striking grid 21 is provided with a static arc-striking silver point 22, which can contact the arc contact silver point 68 to achieve current conduction.

[0076] 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.

[0077] like Figure 8 , Fig.16 , Fig.17a and Fig.17b As shown, the first left baffle 26 and the second right baffle 32 in the second-stage arc extinguishing system 73 can cooperate with the bracket 30 to form a first arc entrance 57 and a second arc entrance 58, respectively connecting the first arc extinguishing chamber 61 and the second arc extinguishing chamber 60 with 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 entrances is consistent with the number of parallel arc extinguishing grid groups.

[0078] In one embodiment, a left front baffle 24 and a right front baffle 54 are provided on both sides of the front arc-extinguishing grid group 23. The left front baffle 24 and the right front baffle 54 have a chamfer structure 25. The chamfer structure 25 guides the arc-extinguishing grid gaps of the first section and the second section of the front arc-extinguishing grid group 23 to the first arc-extinguishing chamber 61 and the second arc-extinguishing chamber 60 respectively.

[0079] like Fig.15a , Fig.15b , Fig.15c and Fig.18 As shown, the left front baffle plate 24 and the right front baffle plate 54 have a chamfered structure 25, and the chamfered structure 25 can guide the arc extinguishing grid gap of the front arc extinguishing grid group 23 to the first arc inlet 57 and the second arc inlet 58 in different directions. The chamfered structure 25 is conducive to guiding the arc and high-temperature gas into the second-stage arc extinguishing system 73, reducing the turning resistance of the arc and high-temperature gas. The number of grid gap directions of the front arc extinguishing grid group 23 can be increased or decreased according to the number of arc inlet ports.

[0080] In one embodiment, a groove structure 39 is provided on the side of the bracket 30 , the first left baffle plate 26 , and the second right baffle plate 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 long and short shapes, and the ends of the longer arc extinguishing grids are inserted into the groove structure 39 .

[0081] like Figure 8 , Fig.14 and Fig.16 As shown, the length of the end of the arc-extinguishing grid in the front arc-extinguishing grid group 23 is arranged in a long and short interval. The bracket 30, the first left baffle 26 and the second right baffle 32 are provided with a groove structure 39 at the corresponding fitting position with the end of the front arc-extinguishing grid group 23, and the end of the longer arc-extinguishing grid of the front arc-extinguishing grid group 23 is inserted into the groove structure 39. The arrangement of the groove structure 39 can prevent the arc in the gap of the arc-extinguishing grid of the front arc-extinguishing grid group 23 from escaping outside the guiding direction, and at the same time change the electric field arrangement at the end of the arc-extinguishing grid, prevent the electric field from being too concentrated, resulting in a strong electric field discharge short circuit at the end of the arc-extinguishing grid, thereby causing a short circuit between the arc-extinguishing grids and the failure of the arc-extinguishing grids.

[0082] 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 by 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 guide 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 respectively divert the arcs in different arc extinguishing chambers in the second-stage arc extinguishing system 73 to prevent arcs with different voltage gradients from short-circuiting and breaking down. The guide 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 entrance port 57 and the second arc entrance port 58, reduce the exhaust resistance of the arc extinguishing grid gap away from each arc entrance port, 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 entrance from ejecting high-energy arc too early, causing the arc to continue to burn at the end of the arc extinguishing grid, resulting in breaking failure.

[0083] like Figure 8 and Fig.11 As shown, the cover 50 is fixed to the top of the arc extinguishing system 1, and has an outlet hole 51 arranged offset from the exhaust port 45, which can prevent the molten metal from directly spraying out of the arc extinguishing system 1, thereby achieving complete protection of the external power distribution equipment. A metal mesh 46 is provided in the exhaust port 45 to further eliminate the residual arc energy and achieve no arcing. The end baffle 49 uses a fixing plate 48 to fix the metal mesh 46, the guide plate 41, the guide plate 44 and the cover 50 to the arc extinguishing system 1.

[0084] like Figure 1 to Figure 32As shown, the present invention also provides an electrical switch, including a housing 3 and an arc extinguishing system 1 as described above, wherein 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, and further includes a static contact busbar 7 and a moving contact busbar 8, wherein 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 mask 2 is provided on the front side of the housing 3, wherein the left side plate 6 is used to install a secondary wiring terminal 9, and the rear side of the housing 3 is used to install the moving contact busbar 8 and the static contact busbar 7. By changing the layout of the traditional electrical switch, the secondary wiring terminal 9 originally arranged on the top of the electrical switch is changed to be arranged on the side of the electrical switch, that is, installed on the surface of the left side plate 6, and a secondary wiring terminal 9 with a smaller volume is used, and the space of the original secondary wiring terminal 9 is provided to the arc extinguishing system 1, thereby improving the space utilization rate.

[0085] like Figure 4 As shown, the arc extinguishing system 1 is placed inside the electrical switch housing 3 and on the top of the electrical switch, and the size of the arc extinguishing system 1 placed on the top of the electrical switch covers the entire size of the electrical switch mask 2 and the housing 3 in the depth direction, greatly increasing the number of arc extinguishing grids therein. The arc extinguishing system 1 adopts a multi-stage structure arrangement, including a first-stage arc extinguishing system 72 placed inside the electrical switch housing 3, and a second-stage arc extinguishing system 73 arranged on the top of the electrical switch.

[0086] like Fig.31 and Fig.32 As shown, compared Fig.31 The traditional universal circuit breaker structure type electrical switch, and Fig.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 rate, 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, does not affect the wiring reliability and convenience of the main circuit terminals, does not require additional mold costs and material costs, and greatly saves costs.

[0087] like Figure 8 , Fig.17a , Fig.17b and Fig. 20As shown, a V-shaped arc-striking structure 35 may be provided between the middle flat plate portion and the front end plane of the movable arc-striking grid 33, so that when the electrical switch is opened and the arc contact 67 is opened, the arc quickly jumps from the surface of the arc contact 67 to the movable arc-striking grid 33, reducing the arc erosion of the arc contact 67, increasing the service life of the arc contact 67, and shortening the time for the arc to enter the arc extinguishing system 1. An iron core 34 may be added to the V-shaped arc-striking structure 35 to increase the heat capacity 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 enters the second arc extinguishing grid group 38 according to the path.

[0088] In one embodiment, it further includes a connection plate 17 and a connection plate 2 55. The static contact busbar 7 is connected to the static arc-striking grid 21 at the same potential through the connection plate 17. The connection plate 17 and the static arc-striking grid 21 are connected by a detachable equipotential connection screw 15. The moving contact busbar 8 is connected to the moving arc-striking grid 33 at the same potential through the connection plate 2 55. A connection bar assembly 16 is further connected between the connection plate 2 55 and the moving arc-striking grid 33. The connection plate 2 55 and the connection bar assembly 16 are connected by a detachable equipotential connection screw 15.

[0089] like Figure 5a , Figure 5b , Figure 6a , Figure 6b and Fig.24 As shown, when the arc extinguishing system 1 is connected and disconnected for many times and needs to be replaced and maintained, it is only necessary to remove the stopper 5, remove the equipotential connection screws 15 and other fixing screws on the surface, and then remove the arc extinguishing system 1 from the electrical switch without removing other parts, so as to achieve rapid maintenance of the arc extinguishing system 1. During installation, the equipotential connection screws 15 can also be used to achieve rapid double equipotential connection between the arc extinguishing system 1 and the electrical switch, and the connection method is simple and reliable.

[0090] like Figure 7 , Fig. 22 , Fig.23 and Fig.24As shown, the arc extinguishing system 1 adopts a double 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 plug 63 is used to electrically isolate the redundant part. 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 moving speed of the arc 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, shortens the time from the arc generation to the intervention of the arc-striking grid, can quickly suppress the arc energy, and make 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-striking structure 35 is greatly reduced, thereby increasing the electrical life of the arc contact 67 and the V-shaped arc-striking 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.

[0091] 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 groove structure 66, and also includes a moving contact baffle 12. The moving contact baffle 12 is slidably connected to the slide groove 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.

[0092] like Fig.25a , Fig.25b , Fig.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 two side protrusions 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 fit with the cylindrical structure 52 of the arc extinguishing system 1 shell. 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 shell. While keeping the moving contact baffle 12 in contact with the arc extinguishing system 1, it can rotate around the central axis of rotation of the moving contact system 10 to prevent the arc generated in the narrow gap structure 56 from entering the space where the main contact 69 and the static contact busbar 7 are located, ensuring that the arc is only generated between the arc contact 67 and the static arc-starting grid 21.

[0093] like Figure 27 to Figure 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 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 moving contact system 10 can be driven by pushing the operating handle using the push rod 14. At this time, the operating handle rotates around the rotating shaft 13.

[0094] When the opening action is performed, 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 a direction away from the arc contact 67, and finally ensures that the opening is in place and the moving contact cover 11 and the moving contact baffle 12 are used to block the arc (such as Fig.25a and Fig.25b status shown).

[0095] 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 Fig.26a and Figure 26b shown).

[0096] 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, and prevent the arc from contacting the main contact 69 and the static contact busbar 7, so that the main contact 69 and the static contact busbar 7 will not be broken down due to the arc. At the same time, it can prevent the high-pressure and high-temperature gas in the narrow gap structure 56 from moving toward the main contact 69, promote the air blowing effect to push the arc toward the arc extinguishing chamber, and improve the air blowing effect.

[0097] The working principle of the present invention is as follows:

[0098] Take the breaking process as an example.

[0099] Fig. 27 This is a schematic diagram of the current path of the electrical switch just before the switch is opened.

[0100] At this time, the arc contact silver point 68 on the arc contact 67 is still in contact with the static arc-starting silver point 22 of the static arc-starting grid 21, and the relative position of the moving contact baffle 12 and the moving contact cover 11 is Fig.26a and Figure 26b As shown, the current path is: moving contact busbar 8 → arc contact 67 → static arc-starting grid 21 → connecting plate 17 → static contact busbar 7.

[0101] Fig.28 Schematic diagram of current and arc path at the initial stage of breaking.

[0102] At this time, the electrical switch is disconnected, and an arc is generated between the arc contact 67 and the static arc-striking grid 21, and is in the narrow gap structure 56. Since the moving arc-striking grid 33, the arc contact 67 and the 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 the arc ablation of the arc contact 67 and reducing the arc-striking resistance on the surface of the moving arc-striking grid 33. The current path is quickly changed 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 dynamic arc-striking grid 33 and the static arc-striking grid 21.

[0103] 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.

[0104] Fig.29 Schematic diagram of current and arc path in the early stage of disconnection.

[0105] The arc is pulled by the moving arc-starting grid 33 and the static arc-starting grid 21 and quickly enters the front arc-extinguishing grid group 23. The arc energy is greatly reduced by the arc-extinguishing grid's deionization effect. Since the electrical switch is disconnected, the arc-extinguishing grid begins to intervene at the beginning of the arc generation, shortening the arc-extinguishing grid intervention time, quickly suppressing the arc energy, reducing the impact of the arc on the arc-extinguishing system 1, and creating favorable conditions for the subsequent arc extinguishing.

[0106] Fig.30a Schematic diagram of the current and arc path at the end of the interruption of the first arc-extinguishing grid group 29; Fig.30b It is a schematic diagram of the current and arc path at the end of the interruption of the second arc-extinguishing grid group 38.

[0107] like Fig.30a and Fig.15c As shown, after the arc flows through the front arc-extinguishing grid group 23, the arc in the lower part (second section) enters the first arc-extinguishing grid group 29 under the traction of the static arc-striking grid 21 and the first upper arc-striking grid 28, and is cut and cooled by each arc-extinguishing grid.

[0108] like Fig.30b and Fig.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-striking grid 33 and the second lower arc-striking grid 37, and is cut and cooled by each arc-extinguishing grid.

[0109] 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-starting grids, such as Fig.21 As shown. The arc is cut and cooled by a large number of arc-extinguishing grids in series, and the voltage increases rapidly. After the arc is extinguished once by the first-stage arc-extinguishing system 72, it enters the second-stage arc-extinguishing system 73 and is extinguished again by a large number of arc-extinguishing grids. The arc energy decreases rapidly and the arc is extinguished. Since the number of arc-extinguishing grids in series is greatly increased, the electrical switch can be disconnected at a higher voltage, thereby increasing the working voltage of the electrical switch.

[0110] After 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, the 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: Fig.30a and Fig.30b Under the action of the guide slope 47, the exhaust resistance at the first arc inlet 57 and the guide slope 47 is larger, and the exhaust resistance away from the arc inlet is smaller, so that the airflow is more balanced, preventing the arc from being discharged directly from the arc extinguishing gap facing the arc inlet, improving the synchronization of the arc extinguishing grid cutting the arc, and improving the utilization rate of the grid.

[0111] 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 to achieve zero arcing.

[0112] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood 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 comprises 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, and are 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, different rear arc extinguishing grids are connected in series through an arc-starting 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, respectively used to connect the static arc-starting grid and the dynamic arc-starting grid, the front end of the arc-starting grid group is 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 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 smaller than that of the second-stage arc extinguishing system. The moving arc-striking grid is used for equipotential connection with the moving contact busbar, and the static arc-striking grid is used for equipotential connection with the static contact busbar.

2. The arc extinguishing system according to claim 1, characterized in that: The front arc-extinguishing grid group is divided into a first section and a second section by the arc-striking 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-striking grid group includes a first upper arc-striking grid and a second lower arc-striking grid, the front end of the first upper arc-striking grid and the front end of the second lower arc-striking grid are attached to and inserted between the first section and the second section, the rear end of the first upper arc-striking grid is located at the top of the first arc-extinguishing grid group, and the rear end of the second lower arc-striking grid is located at the bottom of the second arc-extinguishing grid group; the static arc-striking grid is provided at the bottom end of the first arc-extinguishing grid group, and the dynamic arc-striking grid is provided at the top of the second arc-extinguishing grid group.

3. The arc extinguishing system according to claim 2, characterized in that: It also 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 entry 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.

4. The arc extinguishing system according to claim 3, characterized in that: The arc entrance side of the first arc-extinguishing grid group is provided with a first left baffle and a first right baffle, and the arc entrance side of the second arc-extinguishing grid group is provided with a second left baffle and a second right baffle, the first left baffle and the second spacer plate cooperate to form a first arc entrance opening, and the second right baffle and the second spacer plate cooperate to form a second arc entrance opening.

5. The arc extinguishing system according to claim 4, characterized in that: A left front baffle and a right front baffle are provided on both sides of the front arc-extinguishing grid group, and the left front baffle and the right front baffle have chamfered structures, and the chamfered structures guide the arc-extinguishing grid gaps of the first section and the second section of the front arc-extinguishing grid group to the first arc-extinguishing chamber and the second arc-extinguishing chamber respectively.

6. The arc extinguishing system according to claim 4, characterized in that: A groove structure is provided on one side of the bracket, the first left baffle plate and the second right baffle plate 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 long and short shapes, and the ends of the longer arc extinguishing grids are inserted into the groove structure.

7. The arc extinguishing system according to claim 3, characterized in that: It also includes a guide plate and a guide plate, wherein the guide plate is arranged at the end of the rear arc-extinguishing grid group, the guide plate is arranged on the outside of the guide plate, the guide plates correspond one to one to the rear arc-extinguishing chambers, the guide plate has a guide hole, the guide plate has an exhaust port and a guide slope, and the guide slope is used to guide the airflow of the guide hole to the exhaust port.

8. An electrical switch, characterized in that: It includes a shell and an arc extinguishing system as described in any one of claims 1 to 7, 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, a face 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.

9. The electrical switch according to claim 8, characterized in that: 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 connecting 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 connecting screw.

10. The electrical switch according to claim 8, 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 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.

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