Arc extinguishing system and electric appliance switch thereof

Abstract

The invention discloses an arc extinguishing system and an electric appliance switch thereof, and belongs to the technical field of electric appliance equipment, the arc extinguishing system comprises a front arc extinguishing grid plate group and a rear arc extinguishing grid plate group which are connected in parallel, and the front arc extinguishing grid plate group is connected with a static arc striking grid plate and a movable arc striking grid plate; when one rear arc extinguishing grid plate group is arranged, two ends of the rear arc extinguishing grid plate group are respectively connected with the static arc striking grid plate and the movable arc striking grid plate, and when multiple rear arc extinguishing grid plate groups are arranged, one end of the first group is connected with the static arc striking grid plate, and one end of the second group is connected with the movable arc striking grid plate; when a plurality of groups of rear arc extinguishing grid sheet groups are arranged, the arc extinguishing grid sheet structure also comprises arc striking grid sheet groups, the front ends of the arc striking grid sheet groups are attached and inserted among the arc extinguishing grid sheets of the front arc extinguishing grid sheet group, the rear ends of the arc striking grid sheet groups are respectively connected with the end parts of different rear arc extinguishing grid sheet groups, and the different rear arc extinguishing grid sheet groups are connected in series through the arc striking grid sheet groups. According to the invention, the intervention time of the arc extinguishing grid sheets can be shortened, the initial arc energy is greatly reduced, the duration of the metal phase arc is reduced, the number of the arc extinguishing grid sheets can be increased, and the breaking capacity and the electrical life of the electric appliance switch are greatly 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 thereof. Background Art

[0002] In the power system, switchgear is a key device for circuit control and protection. Its performance is directly related to the stable operation of the power system and the safety of electrical equipment. During the operation of the switchgear, especially during the on-load separation and connection process, the voltage between the contacts will cause air dielectric discharge, thereby forming an arc. The existence of the arc will not only cause serious ablation of the contacts, but may also pose a threat to electrical equipment and the entire distribution system. Therefore, how to effectively extinguish the arc has become a core issue in the design of switchgear.

[0003] The traditional solution is to use an arc extinguishing system composed of arc extinguishing grids, which extinguish the arc by cutting and cooling the arc. The ability of the arc extinguishing grid to quickly build up arc voltage and the deionization effect are key factors in determining whether the electrical switch can reliably extinguish the arc in a short time. With the development of electrical switches towards high voltage, in order to extinguish the arc in a higher voltage environment, the method of increasing the number of stacked grids is usually adopted to increase the arc voltage. However, this method brings new problems: the increase in the number of grids leads to an increase in the stacking height, and the arc needs to be elongated to ensure that it is cut by a large number of arc extinguishing grids at the same time, thereby ensuring the grid utilization rate and arc voltage. However, the elongation of the arc requires a large space, which is challenged by space limitations in practical applications.

[0004] At present, the long-running arc structure is widely used to solve this problem. This structure is connected by arc-starting bending, so that the arc is gradually elongated during the movement to ensure that the elongated arc can be cut by a sufficient number of grids at the same time. However, this structure has obvious defects: on the one hand, there is a large space between the arc-extinguishing grid and the contact, resulting in low space utilization in the arc-extinguishing system, and it is impossible to arrange more arc-extinguishing grids, thereby limiting the increase in arc voltage; on the other hand, since the arc-extinguishing grid is far away from the contact, the arc can only move a certain distance under the action of air blowing or magnetic blowing in the stage with the highest energy (i.e., the initial stage of the switch disconnection, the most intense inductive discharge, and the maximum arc energy) before it can contact the arc-extinguishing grid and be cut, which prolongs the transition time of the metal phase arc to the gas phase arc, increases the risk of arc ablation of the contact and the arc-starting structure, and seriously affects the arc extinguishing effect and the electrical life of the switch.

[0005] Therefore, how to overcome the deficiencies of the existing technology and improve the overall performance and reliability of switchgear is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The object of the present invention is to provide an arc extinguishing system and an electrical switch thereof to solve the problems existing in the above-mentioned prior art, shorten the intervention time of the arc extinguishing grid, significantly reduce the initial arc energy, and reduce the duration of the metal phase arc. At the same time, the number of arc extinguishing grids can be increased, and the breaking capacity and electrical life of the electrical switch can be greatly improved.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides an arc extinguishing system, comprising a front arc extinguishing grid group and a rear arc extinguishing grid group connected in parallel with the front arc extinguishing grid group, wherein two ends of the front arc extinguishing grid group are respectively used to connect a static arc-striking grid and a dynamic arc-striking grid; the rear arc extinguishing grid group is provided with at least one group, when one group is provided, two ends of the rear arc extinguishing grid group are respectively connected to the static arc-striking grid and the dynamic arc-striking grid, and when multiple groups are provided, one end of the first group of the rear arc extinguishing grid group is connected to the static arc-striking grid, and one end of the second group of the rear arc extinguishing grid group is connected to the dynamic arc-striking grid; when multiple groups of the rear arc extinguishing grid group are provided, an arc-striking grid group is also included, wherein 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 respectively connected to the ends of different rear arc extinguishing grid groups, and different rear arc extinguishing grid groups are connected in series through the arc-striking grid group.

[0009] In one embodiment, the front arc-extinguishing grid group is divided by the arc-strike grid group into a first section at the bottom, a second section in the middle, and a third section at the top, the first section, the second section, and the third section include an equal number of arc-extinguishing grids, or the second section includes more arc-extinguishing grids than the first section and the second section; the rear arc-extinguishing grid group includes a first arc-extinguishing grid group, a second arc-extinguishing grid group, and a third arc-extinguishing grid group, the first arc-extinguishing grid group is connected in parallel with the first section, the second arc-extinguishing grid group is connected in parallel with the second section, and the third arc-extinguishing grid group is connected in parallel with the third section.

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

[0011] In one embodiment, the second arc-extinguishing grid group includes more arc-extinguishing grids than the first arc-extinguishing grid group and the third arc-extinguishing grid group.

[0012] 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, a second arc extinguishing chamber and a third arc extinguishing chamber, the bracket includes a vertical plate and a horizontal plate, one side of the vertical plate is connected to the horizontal plate, the other side of the vertical plate is the second arc extinguishing chamber, and the first arc extinguishing chamber and the third arc extinguishing chamber are located on both sides of the horizontal plate; 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, the second arc extinguishing grid plate group is located in the second arc extinguishing chamber, and the third arc extinguishing grid plate group is located in the third arc extinguishing chamber.

[0013] In one embodiment, a left baffle plate 1 and a right baffle plate 1 are provided on both sides of the first arc-extinguishing grid group, a left baffle plate 2 and a right baffle plate 2 are provided on both sides of the second arc-extinguishing grid group, and a left baffle plate 3 and a right baffle plate 3 are provided on both sides of the third arc-extinguishing grid group, and the bracket cooperates with the left baffle plate 1, the right baffle plate 2 and the left baffle plate 3 to form a first arc entrance opening, a second arc entrance opening and a third arc entrance opening respectively.

[0014] 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, the second section and the third section of the front arc-extinguishing grid group to the first arc-extinguishing chamber, the second arc-extinguishing chamber and the third arc-extinguishing chamber respectively.

[0015] In one embodiment, the front end and the end of the arc extinguishing grid of the front arc extinguishing grid group respectively have an arc striking structure and an arc guiding structure, the arc striking structure has the same guiding direction as the corresponding chamfer structure, and the arc guiding structure extends into the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber respectively.

[0016] In one embodiment, the front ends of the left front baffle and the right front baffle cooperate to form a narrow slot structure, and the narrow slot structure is used to cover the entire movement path of the moving contact during the opening and closing process, and the narrow slot structure has a groove structure on the two opposite side surfaces.

[0017] In one embodiment, a groove structure is provided on the left baffle plate 1, the right baffle plate 2, the left baffle plate 3 and the side of the bracket facing the front arc extinguishing chamber, and the ends of the arc extinguishing grids of 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.

[0018] In one embodiment, the static arc-striking grid includes a first V-shaped bending structure and a first bending plane connected to each other, the top of the first V-shaped bending structure has a plane for setting a static arc-striking silver point, the first bending plane is arranged at the lower part of the lowest arc-striking grid of the front arc-extinguishing grid group, and the end extends to the lower part of the lowest arc-striking grid of the first arc-extinguishing grid group.

[0019] In one embodiment, the movable arc-striking grid includes a second V-shaped bending structure and a second bending plane connected to each other, and the second bending plane is arranged on the upper part of the uppermost arc-extinguishing grid of the front arc-extinguishing grid group, and the end extends to the upper part of the uppermost arc-extinguishing grid of the third arc-extinguishing grid group.

[0020] The present invention further provides an electrical switch, comprising a left shell and a right shell, wherein the left shell and the right shell are buckled together to form an arc extinguishing chamber, and the arc extinguishing system as described above is arranged in the arc extinguishing chamber.

[0021] In one embodiment, it also includes guide plate 1, guide plate 2 and guide plate 3, wherein the guide plate 1 is located in the first arc extinguishing chamber and is attached to the first arc extinguishing grid group, the guide plate 2 is located in the second arc extinguishing chamber and is attached to the second arc extinguishing grid group, and the guide plate 3 is located in the third arc extinguishing chamber and is attached to the third arc extinguishing grid group, and the guide plate 1, the guide plate 2 and the guide plate 3 are respectively provided with guide holes corresponding to the gaps between the arc extinguishing grids.

[0022] In one embodiment, it also includes baffle 1, baffle 2 and baffle 3, wherein baffle 1 is arranged on the outside of guide plate 1, baffle 2 is arranged on the outside of guide plate 2, and baffle 3 is arranged on the outside of guide plate 3, and baffle 1, baffle 2 and baffle 3 are respectively provided with exhaust holes, and metal mesh is provided in the exhaust holes.

[0023] In one embodiment, the baffle plate 2 is provided with a guide slope, the guide slope is located in the middle of the baffle plate 2, and the guide slope is used to guide the airflow to the exhaust holes on the upper and lower sides of the baffle plate 2.

[0024] Compared with the prior art, the present invention has achieved the following technical effects:

[0025] The present invention can shorten the intervention time of the arc extinguishing grids and significantly reduce the initial arc energy by connecting the front arc extinguishing grid group and the rear arc extinguishing grid group in parallel and connecting the rear arc extinguishing grid groups in series, so that the arc can be quickly cut by the arc extinguishing grids, and the arc voltage can be quickly established to consume and limit the arc energy, shorten the duration of the metal phase arc, reduce the ablation of the arc to the arc extinguishing system, and improve the electrical life and breaking capacity. At the same time, it can improve the space utilization of the arc extinguishing system, arrange more arc extinguishing grids, and increase the working voltage of the electrical switch, which can significantly improve the breaking capacity and electrical life of the electrical switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 An exploded diagram of an arc extinguishing system according to an embodiment of the present invention;

[0028] Figure 2 Axonometric view of the arc extinguishing system according to an embodiment of the present invention Figure 1 ;

[0029] Figure 3 Axonometric view of the arc extinguishing system according to an embodiment of the present invention Figure 2 ;

[0030] Figure 4 This is an axonometric diagram of the arc extinguishing system of an embodiment of the present invention after removing the left shell and the right shell;

[0031] Figure 5 for Figure 4 Axonometric view after removing the baffles and metal mesh;

[0032] Figure 6for Figure 5 Axonometric view after removing each guide plate;

[0033] Figure 7 The arc extinguishing system of the embodiment of the present invention, each arc-starting grid and the bracket assembly structure are measured from the axonometric perspective. Figure 1 ;

[0034] Figure 8 The arc extinguishing system of the embodiment of the present invention, each arc-starting grid and the bracket assembly structure are measured from the axonometric perspective. Figure 2 ;

[0035] Fig. 9 This is an axonometric diagram of the assembly structure of the arc extinguishing system, the bracket, the first arc extinguishing grid group, the second arc extinguishing grid group, and the third arc extinguishing grid group of the embodiment of the present invention;

[0036] Fig.10 This is an axonometric diagram of the position of the second arc extinguishing chamber of the arc extinguishing system according to an embodiment of the present invention;

[0037] Fig.11 This is an axonometric diagram of the positions of the first arc extinguishing chamber and the third arc extinguishing chamber of the arc extinguishing system according to an embodiment of the present invention;

[0038] Fig.12 This is a schematic diagram of the assembly structure of the front arc-extinguishing grid group of the arc-extinguishing system according to an embodiment of the present invention;

[0039] Fig.13 This is a schematic diagram of the assembly structure of the left front baffle and the right front baffle of the arc extinguishing system according to an embodiment of the present invention;

[0040] Fig.14 This is an exploded schematic diagram of the arc extinguishing system according to an embodiment of the present invention, with the left shell and the right shell removed;

[0041] Fig.15 An exploded schematic diagram of each arc extinguishing grid group of the arc extinguishing system according to an embodiment of the present invention;

[0042] Fig.16 A schematic diagram of the current of each arc-striking grid and the arc path at the end of the interruption of the arc extinguishing system according to an embodiment of the present invention;

[0043] Fig.17 This is an axonometric diagram of the current of each arc-starting grid and the arc path at the end of the interruption of the arc extinguishing system of an embodiment of the present invention;

[0044] Fig.18 The arc extinguishing system of the embodiment of the present invention, the expansion diagram of the connection relationship of each arc extinguishing grid group, and the schematic diagram of the interruption medium-term current and arc path;

[0045] Fig.19 The arc extinguishing system of the embodiment of the present invention, the expansion diagram of the connection relationship of each arc extinguishing grid group, and the schematic diagram of the current and arc path at the end of the interruption;

[0046] Fig.20a The arc extinguishing system of the embodiment of the present invention is a side view of each arc extinguishing grid group;

[0047] Fig.20b for Fig.20a AA section view;

[0048] Fig.20c for Fig.20a BB cross-sectional view;

[0049] Fig.20d for Fig.20a CC section view;

[0050] Fig.21a This is a side view of an arc extinguishing system according to an embodiment of the present invention;

[0051] Figure 21b A top view of an arc extinguishing system according to an embodiment of the present invention;

[0052] Fig.22a for Figure 21b DD cross-sectional view is a schematic diagram of the current path when the electrical switch of the embodiment of the present invention is in the closed state;

[0053] Figure 22b for Figure 21b EE cross-sectional view is a schematic diagram of the current path when the electrical switch of the embodiment of the present invention is in the closed state;

[0054] Fig.23a for Figure 21b DD cross-sectional view is a schematic diagram of the current and arc path at the initial stage of disconnection of the electrical switch according to an embodiment of the present invention;

[0055] Figure 23b for Figure 21b EE cross-sectional view is a schematic diagram of the current and arc path at the initial stage of disconnection of the electrical switch according to an embodiment of the present invention;

[0056] Fig.24a for Figure 21b DD cross-sectional view, schematic diagram of current and arc path during the disconnection period of the electrical switch according to the embodiment of the present invention;

[0057] Figure 24b for Figure 21b EE cross-sectional view, schematic diagram of current and arc path in the middle of disconnection of the electrical switch according to the embodiment of the present invention;

[0058] Fig.25a for Figure 21b DD cross-sectional view, schematic diagram of current and arc path at the end of disconnection of the electrical switch according to the embodiment of the present invention;

[0059] Fig.25b for Figure 21b EE cross-sectional view, schematic diagram of current and arc path at the end of disconnection of the electrical switch of an embodiment of the present invention.

[0060] Among them, 1. left shell; 2. right shell; 3. left front baffle; 4. right front baffle; 5. static arc-starting grid; 6. static arc-starting silver point; 7. front arc-extinguishing grid group; 8. arc-starting structure; 9. arc-guiding structure; 10. dynamic arc-starting grid; 11. iron core; 12. left baffle 1; 13. right baffle 1; 14. first arc-extinguishing grid group; 15. first upper arc-starting grid; 16. third lower arc-starting grid; 17. second lower arc-starting grid; 18. second upper arc-starting grid; 19. bracket; 20. groove structure; 21. chamfer structure; 22. left baffle 2; 23. right baffle 2; 24. second arc-extinguishing grid group; 2 5. Left baffle three; 26. Right baffle three; 27. The third arc-extinguishing grid group; 28. Guide plate one; 29. ​​Guide plate two; 30. Guide plate three; 31. Baffle one; 32. Baffle two; 33. Baffle three; 34. Guide hole; 35. Exhaust hole; 36. Metal mesh; 37. Cover plate; 38. Front arc-extinguishing chamber; 39. First arc-extinguishing chamber; 40. Second arc-extinguishing chamber; 41. Third arc-extinguishing chamber; 42. First arc-entry port; 43. Second arc-entry port; 44. Third arc-entry port; 45. Narrow slit structure; 46. Groove structure; 47. Guide slope; 48. Equipotential connection point; 49. Moving contact. DETAILED DESCRIPTION

[0061] 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.

[0062] The object of the present invention is to provide an arc extinguishing system and an electrical switch thereof to solve the problems existing in the prior art, shorten the intervention time of the arc extinguishing grid, significantly reduce the initial arc energy, and reduce the duration of the metal phase arc. At the same time, the number of arc extinguishing grids can be increased, and the breaking capacity and electrical life of the electrical switch can be greatly improved.

[0063] 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.

[0064] like Figure 1 to Figure 25bAs shown, the present invention provides an arc extinguishing system, including a front arc extinguishing grid group 7 and a rear arc extinguishing grid group connected in parallel with the front arc extinguishing grid group 7, wherein the front and the rear are based on the arc movement path during arc extinguishing, that is, in the arc extinguishing system, the one close to the arc generating position is the front, and the one far away from the arc generating position is the rear. The two ends of the front arc extinguishing grid group 7 (referring to the upper and lower ends, that is, the two ends in the thickness direction of the arc extinguishing grid stack) are respectively used to connect the static arc ignition grid 5 and the moving arc ignition grid 10, the static arc ignition grid 5 is used to connect the static contact, and the moving arc ignition grid 10 is used to connect the moving contact 49 during the breaking process. At least one group of rear arc-extinguishing grid groups is provided. When one group is provided, the two ends of the rear arc-extinguishing grid group are respectively connected to the static arc-striking grid 5 and the dynamic arc-striking grid 10; when multiple groups are provided, one end of the first group of rear arc-extinguishing grid groups is connected to the static arc-striking grid 5, and one end of the second group of rear arc-extinguishing grid groups is connected to the dynamic arc-striking grid 10, and the first group of rear arc-extinguishing grid groups is connected in series with the second group of rear arc-extinguishing grid groups or connected in series through other rear arc-extinguishing grid groups (when there are more than two groups). When multiple groups of rear arc-extinguishing grid groups are provided, an arc-striking grid group is also included, and the arc-striking grid group is composed of at least two arc-striking grids, 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 7, and the rear end of the arc-striking grid group is respectively connected to the ends of different rear arc-extinguishing grid groups, so that different rear arc-extinguishing grid groups are connected in series through the arc-striking grid group.

[0065] The present invention can shorten the intervention time of the arc extinguishing grids and significantly reduce the initial arc energy through the parallel connection of the front arc extinguishing grid group 7 and the rear arc extinguishing grid group and the series connection between the rear arc extinguishing grid groups (when multiple groups of rear arc extinguishing grid groups are provided), so that the arc can be quickly cut by the arc extinguishing grids, the arc voltage can be quickly established to consume and limit the arc energy, the duration of the metal phase arc can be shortened, the arc erosion caused by the arc to the arc extinguishing system can be reduced, and the electrical life and breaking capacity can be improved. At the same time, it can improve the space utilization of the arc extinguishing system, arrange more arc extinguishing grids, and increase the working voltage of the electrical switch, which can significantly improve the breaking capacity and electrical life of the electrical switch.

[0066] In one embodiment, in combination Figure 18-19As shown, the front arc-extinguishing grid group 7 is divided into the first section at the bottom, the second section in the middle and the third section at the top by the arc-initiating grid group in the thickness direction. The first section, the second section and the third section contain the same number of arc-extinguishing grids, or the second section contains more arc-extinguishing grids than the first section and the second section. Since the arc is generated by the moving and static contacts, the second section is directly opposite to the arc opening position, and the arc duration is relatively long. By using more arc-extinguishing grids in the second section, the movement and change of the arc can be adapted. In addition, the number of arc-extinguishing grids in the second section also corresponds to the opening distance of the moving and static contacts. If the opening distance is large, more arc-extinguishing grids can be set accordingly, and if the opening distance is small, fewer arc-extinguishing grids can be set accordingly. The rear arc-extinguishing grid group includes a first arc-extinguishing grid group 14, a second arc-extinguishing grid group 24 and a third arc-extinguishing grid group 27. The first arc-extinguishing grid group 14 is connected in parallel with the first section, the second arc-extinguishing grid group 24 is connected in parallel with the second section, and the third arc-extinguishing grid group 27 is connected in parallel with the third section.

[0067] In one embodiment, in combination Figure 15 to Figure 19 As shown, the arc-striking grid group includes a first upper arc-striking grid 15, a second lower arc-striking grid 17, a third lower arc-striking grid 16 and a second upper arc-striking grid 18. The front end of the first upper arc-striking grid 15 and the front end of the second lower arc-striking grid 17 are attached to and inserted between the first section and the second section, the rear end of the first upper arc-striking grid 15 is located at the top of the first arc-extinguishing grid group 14, and the rear end of the second lower arc-striking grid 17 is located at the bottom of the second arc-extinguishing grid group 24, forming a connection structure in which the first arc-extinguishing grid group 14 and the second arc-extinguishing grid group 24 are connected in series. The front end of the third lower arc-striking grid 16 and the front end of the second upper arc-striking grid 18 are attached to and inserted between the second section and the third section, the rear end of the third lower arc-striking grid 16 is located at the bottom of the third arc-extinguishing grid group 27, and the rear end of the second upper arc-striking grid 18 is located at the top of the second arc-extinguishing grid group 24, forming a connection structure in which the second arc-extinguishing grid group 24 and the third arc-extinguishing grid group 27 are connected in series. The front plane of the arc-striking grid is aligned with the front arc-extinguishing grid group 7, and the front arc-extinguishing grid group 7 is divided into three parts: the first section, the second section and the third section. The bottom end of the first arc-extinguishing grid group 14 is provided with a static arc-striking grid 5, and the top end of the third arc-extinguishing grid group 27 is provided with a dynamic arc-striking grid 10.

[0068] Thus, the arc-striking grid group makes the arc-striking grids in the first arc-striking grid group 14, the second arc-striking grid group 24 and the third arc-striking grid group 27 form a series structure consisting of: the static arc-striking grid 5 → the first arc-striking grid group 14 → the first upper arc-striking grid 15 → the second lower arc-striking grid 17 → the second arc-striking grid group 24 → the second upper arc-striking grid 18 → the third lower arc-striking grid 16 → the third arc-striking grid group 27 → the moving arc-striking grid 10. The series structure makes the first arc-striking grid group 14, the second arc-striking grid group 24 and the third arc-striking grid group 27 form a series form, and at the same time, this series structure is connected in parallel with the front arc-striking grid group 7 through the static arc-striking grid 5 and the moving arc-striking grid 10. At this time, the first arc-extinguishing grid group 14 is connected in parallel with several arc-extinguishing grids of the first section between the static arc-striking grid 5 and the first upper arc-striking grid 15; the second arc-extinguishing grid group 24 is connected in parallel with several arc-extinguishing grids of the second section between the second lower arc-striking grid 17 and the second upper arc-striking grid 18; the third arc-extinguishing grid group 27 is connected in parallel with several arc-extinguishing grids of the third section between the third lower arc-striking grid 16 and the movable arc-striking grid 10.

[0069] The above-mentioned arrangement of arc extinguishing grids allows more arc extinguishing grids to be arranged in the same space. As the number of arc extinguishing grids increases, the stacking height of the arc extinguishing grids also increases accordingly. The arc can be elongated and cut by a large number of arc extinguishing grids at the same time, effectively ensuring the utilization rate of the arc extinguishing grids and reliably improving the arc voltage.

[0070] In one embodiment, the second arc-extinguishing grid group 24 includes more arc-extinguishing grids than the first arc-extinguishing grid group 14 and the third arc-extinguishing grid group 27. By connecting the second arc-extinguishing grid group 24 in parallel with the second section, the longest arc with the highest energy in the second section passes through more arc-extinguishing grids, thereby achieving a better arc extinguishing effect.

[0071] In one embodiment, in combination Figure 7 to Figure 11As shown, it also includes a bracket 19, which separates the arc extinguishing system into a front arc extinguishing chamber 38 and a rear arc extinguishing chamber. The front arc extinguishing chamber 38 and the rear arc extinguishing chamber can be the internal space wrapped by the left shell 1 and the right shell 2. The rear arc extinguishing chamber includes a first arc extinguishing chamber 39, a second arc extinguishing chamber 40 and a third arc extinguishing chamber 41. The bracket 19 includes a vertical plate and a horizontal plate, one side of the vertical plate is connected to the horizontal plate, the other side of the vertical plate is the second arc extinguishing chamber 40, and the first arc extinguishing chamber 39 and the third arc extinguishing chamber 41 are respectively on both sides of the horizontal plate, that is, the first arc extinguishing chamber 39, the second arc extinguishing chamber 40 and the third arc extinguishing chamber 41 are distributed in a triangular shape so that they can be installed in a rectangular space. The front arc-extinguishing grid group 7 is located in the front arc-extinguishing chamber 38, the first arc-extinguishing grid group 14 is located in the first arc-extinguishing chamber 39, the second arc-extinguishing grid group 24 is located in the second arc-extinguishing chamber 40, and the third arc-extinguishing grid group 27 is located in the third arc-extinguishing chamber 41. It should be noted that the first arc-extinguishing chamber 39, the second arc-extinguishing chamber 40 and the third arc-extinguishing chamber 41 are all connected to the front arc-extinguishing chamber 38.

[0072] In one embodiment, in combination Fig. 9 , Fig.14 and Figure 20a to Figure 20d As shown, the first arc-extinguishing grid group 14 is provided with a left baffle 12 and a right baffle 13 on both sides, the front ends of the left baffle 12 and the right baffle 13 cover the front ends of the arc-extinguishing grids on both sides of the first arc-extinguishing grid group 14, and the ends are inserted into the arc-extinguishing grid gaps of the first arc-extinguishing grid group 14. The second arc-extinguishing grid group 24 is provided with a left baffle 22 and a right baffle 23 on both sides, the front ends of the left baffle 22 and the right baffle 23 cover the front ends of the arc-extinguishing grids on both sides of the second arc-extinguishing grid group 24, and the ends are inserted into the arc-extinguishing grid gaps of the second arc-extinguishing grid group 24. The third arc-extinguishing grid group 27 is provided with a left baffle 3 25 and a right baffle 3 26 on both sides, the front ends of the left baffle 3 25 and the right baffle 3 26 cover the front ends of the arc-extinguishing grids on both sides of the third arc-extinguishing grid group 27, and the ends are inserted into the arc-extinguishing grid gaps of the third arc-extinguishing grid group 27. The bracket 19 cooperates with the left baffle plate 12 , the right baffle plate 23 and the left baffle plate 3 25 to form a first arc entrance opening 42 , a second arc entrance opening 43 and a third arc entrance opening 44 , respectively.

[0073] In one embodiment, in combination Fig.12 , Fig.13 and Figure 20a to Figure 20dAs shown, a left front baffle plate 3 and a right front baffle plate 4 are provided on both sides of the front arc-extinguishing grid group 7, and the front ends of the left front baffle plate 3 and the right front baffle plate 4 cover the front ends of both sides of the arc-extinguishing grids of the front arc-extinguishing grid group 7, and the ends are inserted into the arc-extinguishing grid gaps of the front arc-extinguishing grid group 7, and finally fit with the plane of the bracket 19 facing the front arc-extinguishing grid group 7. The left front baffle plate 3 and the right front baffle plate 4 have a chamfer structure 21, and the chamfer structure 21 guides the arc-extinguishing grid gaps of the first section, the second section and the third section of the front arc-extinguishing grid group 7 to the first arc-extinguishing chamber 39, the second arc-extinguishing chamber 40 and the third arc-extinguishing chamber 41 through the first arc-entry opening 42, the second arc-entry opening 43 and the third arc-entry opening 44, respectively. The angle between the direction leading to the second arc extinguishing chamber 40 and the direction leading to the first arc extinguishing chamber 39 is 50° to 150°, and the angle between the direction leading to the second arc extinguishing chamber 40 and the direction leading to the third arc extinguishing chamber 41 is 50° to 150°.

[0074] In one embodiment, in combination Figure 1 , Fig.12 , Fig.13 and Figure 20a to Figure 20d As shown, the front end and the end of the arc extinguishing grid of the front arc extinguishing grid group 7 are respectively provided with an arc striking structure 8 and an arc guiding structure 9, the arc striking structure 8 and the corresponding chamfer structure 21 have the same guiding direction, and the arc guiding structure 9 extends into the first arc extinguishing chamber 39, the second arc extinguishing chamber 40 and the third arc extinguishing chamber 41 respectively. The arc striking structure 8 can reduce the resistance of the arc entering the arc extinguishing grid, which is conducive to the deflection of the arc movement direction, and the arc guiding structure 9 can reduce the resistance of the arc movement, so that the arc quickly enters the first arc extinguishing chamber 39, the second arc extinguishing chamber 40 and the third arc extinguishing chamber 41 respectively. In another simplified embodiment, the arc guiding structure 9 can also be appropriately increased or decreased.

[0075] In one embodiment, in combination Fig.14 and Figure 20a to Figure 20d As shown, the front ends of the left front baffle 3 and the right front baffle 4 cooperate to form a narrow slit structure 45. The material constituting the narrow slit structure 45 is made of gas-generating material. The narrow slit structure 45 is used to cover the entire movement path of the moving contact 49 during the opening and closing process. Theoretically, the narrower the slit structure, the stronger the ability to limit the arc. The narrow slit structure 45 has a groove structure 46 on the two opposite sides. Through the setting of the groove structure 46, the surface area of ​​the two opposite sides of the narrow slit structure 45 can be increased, the creepage distance can be improved, and the carbon and metal residues generated by the breaking can be prevented from reducing the dielectric properties between the open contacts, so that the narrow slit structure 45 can be made relatively narrow. The cross-section of the groove structure 46 can be set to a square, circular or triangular shape, extending in the front-to-back direction, and can be at a certain angle with the horizontal direction, but it should be noted that the direction of the groove structure 46 should not be set to be vertical.

[0076] In one embodiment, in combination Figure 1 , Fig. 9 and Fig.14As shown, the left baffle plate 1 12, the right baffle plate 23, the left baffle plate 3 25 and the bracket 19 are provided with a groove structure 20 on one side facing the front arc extinguishing chamber 38. The groove structures 20 of the same height should be arranged in alignment. The ends of the arc extinguishing grids of the front arc extinguishing grid group 7 are arranged alternately in length, and the ends of the longer arc extinguishing grids are inserted into the groove structure 20. The cooperation between the groove structure 20 and the arc extinguishing grids can enhance the air tightness of the gap between two adjacent arc extinguishing grids. On the other hand, it can effectively reduce the resistance of the arc to detach from the arc extinguishing grids of the front arc extinguishing grid group 7, so that the arc can quickly run into the first arc extinguishing chamber 39, the second arc extinguishing chamber 40 and the third arc extinguishing chamber 41. In addition, the left front baffle 3 and the right front baffle 4 are respectively attached and tightly matched with the bracket 19, the left baffle 1 12, the right baffle 23, and the left baffle 3 25, so that the arc or airflow in the gap between the arc extinguishing grids corresponding to the front arc extinguishing grid group 7 enters the corresponding arc inlet, constrains the arc path, and prevents the arc from flowing through non-designed channels, causing a short circuit and leading to structural failure.

[0077] In one embodiment, in combination Figure 1 , Figure 7 to Figure 11 , Fig.14 and Fig.15 As shown, the static arc-striking grid 5 includes a first V-shaped bending structure and a first bending plane connected to each other. The top of the first V-shaped bending structure has a plane for setting the static arc-striking silver point 6. The first bending plane is set at the lower part of the lowest arc-extinguishing grid of the front arc-extinguishing grid group 7, and the end extends to the lower part of the lowest arc-extinguishing grid of the first arc-extinguishing grid group 14.

[0078] In one embodiment, in combination Figure 1 , Figure 7 to Figure 11 , Fig.14 and Fig.15 As shown, the movable arc-striking grid 10 includes a second V-shaped bending structure and a second bending plane connected to each other, and the second bending plane is arranged on the upper part of the uppermost arc-extinguishing grid of the front arc-extinguishing grid group 7, and the end thereof extends to the upper part of the uppermost arc-extinguishing grid of the third arc-extinguishing grid group 27. In addition, an iron core 11 may be arranged inside the second V-shaped bending structure, and the iron core 11 is arranged to increase the heat capacity at the second V-shaped bending structure to avoid burning the movable arc-striking grid 10.

[0079] In one embodiment, in combination Figure 1 , Figure 7 to Figure 11 , Fig.14 and Fig.15As shown, the first upper arc-striking grid 15, the second lower arc-striking grid 17, the second upper arc-striking grid 18, and the third lower arc-striking grid 16 all adopt a bent structure. The bent plane at the end of the first upper arc-striking grid 15 enters the first arc-extinguishing chamber 39 through the first arc-entry port 42, and extends to the upper part of the uppermost arc-extinguishing grid of the first arc-extinguishing grid group 14. The bent plane at the end of the second lower arc-striking grid 17 enters the second arc-extinguishing chamber 40 through the second arc-entry port 43, and extends to the lower part of the lowermost arc-extinguishing grid of the second arc-extinguishing grid group 24. The bent plane at the end of the second upper arc-striking grid 18 enters the second arc-extinguishing chamber 40 through the second arc-entry port 43, and extends to the upper part of the uppermost arc-extinguishing grid of the second arc-extinguishing grid group 24. The end bending plane of the third lower arc-striking grid 16 enters the third arc-extinguishing chamber 41 through the third arc-entry opening 44 , and extends to the lower part of the lowermost arc-extinguishing grid of the third arc-extinguishing grid group 27 .

[0080] The upper surface of the front plane of the first upper arc-striking grid 15 is fitted with the lower surface of the front plane of the second lower arc-striking grid 17, and equipotential connection points 48 are provided on both sides by welding or riveting. The upper surface of the front plane of the second upper arc-striking grid 18 is fitted with the lower surface of the front plane of the third lower arc-striking grid 16, and equipotential connection points 48 are provided on both sides by welding or riveting. The front planes of the first upper arc-striking grid 15, the second lower arc-striking grid 17, the second upper arc-striking grid 18, and the third lower arc-striking grid 16 are aligned with the arc-extinguishing grids of the front arc-extinguishing grid group 7, and the front arc-extinguishing grid group 7 is divided into three parts: the first section, the second section, and the third section. The gaps of the arc-extinguishing grids in the first section are directed to the first arc-extinguishing chamber 39, the gaps of the arc-extinguishing grids in the second section are directed to the second arc-extinguishing chamber 40, and the gaps of the arc-extinguishing grids in the third section are directed to the third arc-extinguishing chamber 41.

[0081] Recombination Figure 1 to Figure 25b As shown, the present invention also provides an electrical switch, including a left shell 1 and a right shell 2, which are buckled together to form an arc extinguishing chamber, and the arc extinguishing system as described above is arranged in the arc extinguishing chamber, and the internal components of the arc extinguishing system are wrapped and fixed by the left shell 1 and the right shell 2. Through the cooperation of the moving contact system, the arc extinguishing system, and the left shell 1 and the right shell 2, the narrow slit structure 45 close to the moving contact 49 side is as sealed as possible to reduce the amount of gas or arc escaping toward the moving contact 49. When the electrical switch breaks the arc, the arc is generated at the narrow slit structure 45 between the moving contact 49 and the static arc-starting silver point 6. After being eliminated by the arc extinguishing system, the arc energy is quickly reduced and the arc is extinguished.

[0082] In one embodiment, in combination Figure 1 , Figure 5 and Figure 6As shown, it also includes a guide plate 1 28, a guide plate 2 29 and a guide plate 3 30. The guide plate 1 28 is located in the first arc extinguishing chamber 39 and is attached to the first arc extinguishing grid group 14, the static arc-striking grid 5 and the first upper arc-striking grid 15. The guide plate 29 is located in the second arc extinguishing chamber 40 and is attached to the second arc extinguishing grid group 24, the second lower arc-striking grid 17 and the second upper arc-striking grid 18. The guide plate 30 is located in the third arc extinguishing chamber 41 and is attached to the third arc extinguishing grid group 27, the third lower arc-striking grid 16 and the moving arc-striking grid 10. The guide plate 1 28 , the guide plate 2 29 and the guide plate 3 30 are respectively provided with guide holes 34 corresponding to the gaps of the arc extinguishing grids. The gaps and the guide holes 34 can correspond one to one. Through the setting of the guide holes 34 , the residual arc and high-temperature gas in the gaps of the arc extinguishing grids can be discharged from the inside of the arc extinguishing system through the guide holes 34 .

[0083] In one embodiment, in combination Figure 1 , Figure 4 as well as Fig.22a and Figure 22b As shown, it also includes baffle 1 31, baffle 2 32 and baffle 3 33. Baffle 1 31 is arranged on the outside of guide plate 1 28, baffle 2 32 is arranged on the outside of guide plate 29, and baffle 3 33 is arranged on the outside of guide plate 3 30. Baffle 1 31, baffle 2 32 and baffle 3 33 are respectively provided with exhaust holes 35, and metal mesh 36 is arranged in the exhaust hole 35. Metal mesh 36 can ionize residual arc, reduce residual arc energy, and prevent residual arc from being discharged outside the arc extinguishing system.

[0084] In one embodiment, baffle plate 1 31, baffle plate 2 32 and baffle plate 3 33 are separated by bracket 19, and guide plate 1 28, guide plate 2 29 and guide plate 3 30 are separated by bracket 19, and each baffle plate and guide plate are respectively placed in each arc extinguishing chamber to be isolated from each other. A cover plate 37 is also provided, and the cover plate 37 fixes each baffle plate, guide plate and metal mesh 36 to the left shell 1 and the right shell 2.

[0085] In one embodiment, since the second arc-extinguishing grid group 24 can include more arc-extinguishing grids, the baffle plate 2 32 arranged corresponding thereto can have two exhaust holes 35 arranged at intervals, and each exhaust hole 35 corresponds to a part of the arc-extinguishing grid, that is, the baffle plate 2 32 divides the area behind the guide plate 29 into two parts, and the baffle plate 2 32 is provided with a guide slope 47, and the guide slope 47 is located in the middle of the baffle plate 2 32. The guide slope 47 is used to guide the airflow to the exhaust holes 35 on the upper and lower sides of the baffle plate 2 32, so that the airflow discharged from the guide plate 29 is deflected and discharged from the exhaust holes 35 on the upper and lower sides respectively.

[0086] The present invention also provides the working principle of the embodiment as follows:

[0087] like Fig.22a and Figure 22b As shown in FIG. 1 , a schematic diagram of the current path when the electrical switch of an embodiment of the present invention is in the closed state. At this time, the moving contact 49 contacts the static arc-starting silver point 6 on the static arc-starting grid 5 to achieve current conduction. The current path is as follows: Fig.22a and Figure 22b shown.

[0088] like Fig.23a and Figure 23b As shown, it is a schematic diagram of the current and arc path at the initial stage of disconnection of the electrical switch of the embodiment of the present invention. At this time, at the initial stage of disconnection of the electrical switch, the moving contact 49 rotates around the center of rotation of the moving contact in the direction away from the static arc-striking grid 5, the moving contact 49 begins to separate, and the arc is generated between the moving contact silver point and the static arc-striking silver point 6. The left front baffle 3 and the right front baffle 4 on both sides of the narrow slit structure 45 where the moving contact 49 is located are made of gas-generating materials, which are cracked under the high temperature of the arc to generate a particle airflow, forming an air blowing effect. Under the restriction of the narrow slit structure 45, the airflow pushes the arc to move inside the forward arc-extinguishing grid group 7, and is gradually stretched under the bending structure of the moving arc-striking grid 10 and the static arc-striking grid 5.

[0089] like Fig.24a and Figure 24b As shown, it is a schematic diagram of the current and arc path in the middle stage of the disconnection of the electrical switch of the embodiment of the present invention. At this time, the moving contact 49 gradually opens, and the front end of the moving contact 49 gradually approaches the second V-shaped bending structure of the moving arc-striking grid 10. When the distance is small enough, the arc jumps from the front end of the moving contact 49 to the second V-shaped bending structure, reducing the arc ablation of the silver point of the moving contact. At the same time, under the combined effect of air blowing and the attraction of the arc-extinguishing grid, the arc enters the front arc-extinguishing grid group 7 and is cut by the arc-extinguishing grid therein. At this time, the energy of the arc is rapidly reduced under the deionization effect of the arc-extinguishing grid.

[0090] like Fig.24a As shown, the arc inside the plurality of arc extinguishing grids in the second section (middle part) of the front arc extinguishing grid group 7 moves toward the second arc extinguishing grid group 24 under the guidance of the second lower arc striking grid 17 and the second upper arc striking grid 18. The arc and airflow movement directions are shown in FIG. Fig.20c shown.

[0091] like Figure 24b As shown, the arc inside the arc extinguishing grids of the first section (lower part) of the front arc extinguishing grid group 7 moves toward the first arc extinguishing grid group 14 under the guidance of the static arc striking grid 5 and the first upper arc striking grid 15. The arc and airflow movement direction is as shown in FIG. Fig.20d shown.

[0092] like Figure 24bAs shown, the arc inside the arc extinguishing grids of the third section (upper part) of the front arc extinguishing grid group 7 moves toward the third arc extinguishing grid group 27 under the guidance of the moving arc striking grid 10 and the third lower arc striking grid 16. The arc and airflow movement direction is as shown in FIG. Fig.20b shown.

[0093] like Figure 20a to Figure 20d As shown, the arc is constrained by the left front baffle 3 and the right front baffle 4, and its movement direction is deflected, moving toward the first arc extinguishing grid group 14, the second arc extinguishing grid group 24, and the third arc extinguishing grid group 27, respectively. At the moment the arc is generated, the front arc extinguishing grid group 7 begins to intervene. After the arc passes through the front arc extinguishing grid group 7, it is cut into multiple short arcs by the arc extinguishing grid, and the arc voltage is quickly established to limit the arc energy. At the same time, under the deionization effect of the arc extinguishing grid, the energy is greatly reduced. This structure abandons the traditional structure of the long-running arc, and avoids the disadvantages of the long-running arc structure, such as the long intervention time of the arc extinguishing grid, the long-term maintenance of high energy of the arc, the long-term high-temperature ablation of the arc on the contacts and the arc-starting grid, the low electrical life, and the low breaking capacity.

[0094] like Fig.18 and Fig.19 As shown, after the arc enters the front arc extinguishing grid group 7 and is cut into multiple short arcs, since the arc extinguishing grids are vertically stacked, the magnetic resistance of the arc extinguishing grids makes the shape of the arc's forward movement closer to a vertical straight line, prompting the arc to quickly and synchronously enter the first arc extinguishing grid group 14, the second arc extinguishing grid group 24 and the third arc extinguishing grid group 27, avoiding the problem of the arc root moving in sequence when the arc enters each arc extinguishing grid group, causing the arc column to twist, ensuring that the arc is cut by the three arc extinguishing grid groups at the same time, ensuring the simultaneous utilization of the arc extinguishing grids, preventing part of the arc from falling back or escaping the arc extinguishing grid group too early, and causing the arc voltage to be unable to be effectively increased and leading to the occurrence of reignition.

[0095] Fig.18 The expansion diagram of the connection relationship of each arc extinguishing grid group is shown in Figure 1. Fig.24a and Figure 24b Schematic diagram of current and arc path corresponding to the state. Since the upper surface of the front plane of the first upper arc-starting grid 15 fits with the lower surface of the front plane of the second lower arc-starting grid 17, and the upper surface of the front plane of the second upper arc-starting grid 18 fits with the lower surface of the front plane of the third lower arc-starting grid 16, after the current passes through the arc-starting grid, it passes through the equipotential connection point 48 and then returns to the other arc-starting grid. Therefore, at the front plane positions of the first upper arc-starting grid 15 and the second lower arc-starting grid 17, and the front plane positions of the second upper arc-starting grid 18 and the third lower arc-starting grid 16, U-shaped current paths are formed respectively. The two arms of the U-shaped current path are parallel to each other in opposite directions. The Ampere force between the two current paths is opposite in direction and repulsive to each other. The repulsive force pushes the arc root to move quickly into the arc extinguishing system.

[0096] Fig.25a and Fig.25b The figure is a schematic diagram of the current and arc path at the end of the disconnection of the electrical switch of the embodiment of the present invention. At this time, after being cut by the arc extinguishing grid of the front arc extinguishing grid group 7, the arc goes out from the end of the arc extinguishing grid and enters the first arc extinguishing grid group 14, the second arc extinguishing grid group 24 and the third arc extinguishing grid group 27 respectively.

[0097] like Fig.25a As shown, the arc inside the arc-extinguishing grids of the second section (middle part) of the front arc-extinguishing grid group 7 is guided by the second lower arc-starting grid 17 and the second upper arc-starting grid 18, and is gradually elongated under the action of the bending structure of the two, and enters the second arc-extinguishing grid group 24, and is cut by the arc-extinguishing grid. The residual arc and high-temperature gas are discharged from the gap between the arc-extinguishing grids of the second arc-extinguishing grid group 24, and are discharged through the corresponding guide holes 34 of the guide plate 29, and are deflected under the action of the guide slope 47, and pass through the metal mesh 36 set in the exhaust holes 35 at the upper and lower parts of the baffle plate 32. The airflow path and direction are shown in FIG. Fig.25a As shown. The residual arc is ionized through the metal mesh 36 to achieve no arcing. The cross-sectional view of the arc and airflow movement direction is shown in Fig.20c shown.

[0098] like Fig.25b As shown, the arc inside the arc-extinguishing grids of the first section (lower part) of the front arc-extinguishing grid group 7 is guided by the static arc-striking grid 5 and the first upper arc-striking grid 15, and is gradually elongated under the action of the bending structure of the first upper arc-striking grid 15, and enters the first arc-extinguishing grid group 14, and is cut by the arc-extinguishing grid. The residual arc and high-temperature gas are discharged from the gap between the arc-extinguishing grids of the first arc-extinguishing grid group 14, and are discharged through the corresponding guide holes 34 of the guide plate 28, and pass through the metal mesh 36 set in the exhaust hole 35 of the baffle 31. The airflow path and direction are shown in FIG. Fig.25b As shown. The residual arc is ionized through the metal mesh 36 to achieve no arcing. The cross-sectional view of the arc and airflow movement direction is shown in Fig.20d shown.

[0099] like Fig.25b As shown in FIG. 1 , the arc inside the arc-extinguishing grids at the upper part of the front arc-extinguishing grid group 7 is guided by the moving arc-striking grid 10 and the third lower arc-striking grid 16, and is gradually elongated under the action of the bending structure of the third lower arc-striking grid 16, and enters the third arc-extinguishing grid group 27, and is cut by the arc-extinguishing grid. The residual arc and high-temperature gas are discharged from the gaps between the arc-extinguishing grids of the third arc-extinguishing grid group 27, and are discharged through the corresponding guide holes 34 of the guide plate 30, and pass through the metal mesh 36 set in the exhaust hole 35 of the baffle plate 33. The airflow path and direction are shown in FIG. Fig.25b As shown in FIG. 3 , the residual arc is ionized through the metal mesh 36 to achieve arc-free operation. The arc and airflow movement directions are shown in FIG. Fig.20d shown.

[0100] The arrangement of the exhaust holes 35 and the guide slopes 47 of the baffles can keep the pressure inside the three arc extinguishing chambers balanced, restrict the movement speed of the arc and high-temperature gas inside the first arc extinguishing grid group 14, the second arc extinguishing grid group 24 and the third arc extinguishing grid group 27, so that the movement of the arc in the three arc extinguishing grid groups remains synchronized, ensuring that the arc is cut by the three arc extinguishing grid groups at the same time, ensuring the simultaneous utilization of the arc extinguishing grid groups, preventing the arc from moving out of sync, part of the arc falling back or escaping prematurely, and the arc voltage cannot be effectively increased, resulting in the occurrence of reignition.

[0101] Fig.19 The expansion diagram of the connection relationship of each arc extinguishing grid group is shown in Figure 1. Fig.25a and Fig.25b Schematic diagram of current and arc path corresponding to the state. The current and arc path are: static arc-striking grid 5 → first arc-extinguishing grid group 14 → first upper arc-striking grid 15 → second lower arc-striking grid 17 → second arc-extinguishing grid group 24 → second upper arc-striking grid 18 → third lower arc-striking grid 16 → third arc-extinguishing grid group 27 → moving arc-striking grid 10. The arc that has been initially extinguished by the front arc-extinguishing grid group 7 enters a plurality of groups of arc-extinguishing grids in series composed of the first arc-extinguishing grid group 14, the second arc-extinguishing grid group 24 and the third arc-extinguishing grid group 27, and is cut by the plurality of arc-extinguishing grid groups at the same time, and is synchronously extinguished, so that the arc voltage is rapidly increased, thereby extinguishing the arc. At this time, the current and arc path of each arc-striking grid are as follows: Fig.16 and Fig.17 The arc extinguishing grid groups between the arc striking grids are arranged in parallel, which can make full use of the limited space, increase the number of arc extinguishing grids, increase the arc voltage, and enhance the breaking capacity of the electrical switch under high voltage.

[0102] 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 front arc-extinguishing grid group, wherein two ends of the front arc-extinguishing grid group are respectively used to connect a static arc-striking grid and a dynamic arc-striking grid; and a rear arc-extinguishing grid group connected in parallel with the front arc-extinguishing grid group, wherein at least one group of the rear arc-extinguishing grid group is provided. When one group is provided, two ends of the rear arc-extinguishing grid group are respectively connected to the static arc-striking grid and the dynamic arc-striking grid. When multiple groups are provided, one end of the first group of the rear arc-extinguishing grid group is connected to the static arc-striking grid, and one end of the second group of the rear arc-extinguishing grid group is connected to the dynamic arc-striking grid. When multiple groups of the rear arc-extinguishing grid groups are provided, an arc-striking grid group is also included, wherein 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 respectively connected to the ends of different rear arc-extinguishing grid groups, and different rear arc-extinguishing grid groups are connected in series through the arc-striking grid group.

2. The arc extinguishing system according to claim 1, characterized in that: The front arc-extinguishing grid group is divided into a first section at the bottom, a second section in the middle and a third section at the top by the arc-strike grid group, the first section, the second section and the third section include an equal number of arc-extinguishing grids, or the second section includes more arc-extinguishing grids than the first section and the second section; the rear arc-extinguishing grid group includes a first arc-extinguishing grid group, a second arc-extinguishing grid group and a third arc-extinguishing grid group, the first arc-extinguishing grid group is connected in parallel with the first section, the second arc-extinguishing grid group is connected in parallel with the second section, and the third arc-extinguishing grid group is connected in parallel with the third section.

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

4. The arc extinguishing system according to claim 3, characterized in that: The second arc-extinguishing grid group includes more arc-extinguishing grids than the first arc-extinguishing grid group and the third arc-extinguishing grid group.

5. The arc extinguishing system according to claim 3, 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, a second arc extinguishing chamber and a third arc extinguishing chamber, the bracket includes a vertical plate and a horizontal plate, one side of the vertical plate is connected to the horizontal plate, the other side of the vertical plate is the second arc extinguishing chamber, and the two sides of the horizontal plate are respectively the first arc extinguishing chamber and the third 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, the second arc extinguishing grid plate group is located in the second arc extinguishing chamber, and the third arc extinguishing grid plate group is located in the third arc extinguishing chamber.

6. The arc extinguishing system according to claim 5, characterized in that: A left baffle plate 1 and a right baffle plate 1 are provided on both sides of the first arc-extinguishing grid group, a left baffle plate 2 and a right baffle plate 2 are provided on both sides of the second arc-extinguishing grid group, and a left baffle plate 3 and a right baffle plate 3 are provided on both sides of the third arc-extinguishing grid group. The bracket cooperates with the left baffle plate 1, the right baffle plate 2 and the left baffle plate 3 to form a first arc entrance opening, a second arc entrance opening and a third arc entrance opening respectively.

7. The arc extinguishing system according to claim 6, 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, the second section and the third section of the front arc-extinguishing grid group to the first arc-extinguishing chamber, the second arc-extinguishing chamber and the third arc-extinguishing chamber respectively.

8. The arc extinguishing system according to claim 7, characterized in that: The front end and the rear end of the arc extinguishing grid of the front arc extinguishing grid group respectively have an arc striking structure and an arc guiding structure, the arc striking structure has the same guiding direction as the corresponding chamfer structure, and the arc guiding structure extends into the first arc extinguishing chamber, the second arc extinguishing chamber and the third arc extinguishing chamber respectively.

9. The arc extinguishing system according to claim 7, characterized in that: The front ends of the left front baffle plate and the right front baffle plate cooperate to form a narrow slot structure, and the narrow slot structure is used to cover the entire movement path of the moving contact during the opening and closing process. The narrow slot structure has groove structures on the two opposite side surfaces.

10. The arc extinguishing system according to claim 6, characterized in that: The left baffle plate 1, the right baffle plate 2, the left baffle plate 3 and the bracket are provided with a groove structure on one side facing the front arc extinguishing chamber, and the ends of the arc extinguishing grids of 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.

11. The arc extinguishing system according to claim 5, characterized in that: The static arc-striking grid comprises a first V-shaped bending structure and a first bending plane which are connected to each other. The top of the first V-shaped bending structure has a plane for setting a static arc-striking silver point. The first bending plane is arranged at the lower part of the lowest arc-striking grid of the front arc-extinguishing grid group, and the end extends to the lower part of the lowest arc-striking grid of the first arc-extinguishing grid group.

12. The arc extinguishing system according to claim 5, characterized in that: The movable arc-striking grid comprises a second V-shaped bending structure and a second bending plane connected to each other, wherein the second bending plane is arranged on the upper part of the uppermost arc-extinguishing grid of the front arc-extinguishing grid group, and the end thereof extends to the upper part of the uppermost arc-extinguishing grid of the third arc-extinguishing grid group.

13. An electrical switch, characterized in that: It comprises a left shell and a right shell, wherein the left shell and the right shell are buckled together to form an arc extinguishing chamber, and the arc extinguishing chamber is provided with an arc extinguishing system as claimed in any one of claims 5 to 12.

14. The electrical switch according to claim 13, characterized in that: It also includes guide plate 1, guide plate 2 and guide plate 3, wherein the guide plate 1 is located in the first arc extinguishing chamber and fits the first arc extinguishing grid group, the guide plate 2 is located in the second arc extinguishing chamber and fits the second arc extinguishing grid group, the guide plate 3 is located in the third arc extinguishing chamber and fits the third arc extinguishing grid group, and the guide plate 1, the guide plate 2 and the guide plate 3 are respectively provided with guide holes corresponding to the gaps between the arc extinguishing grids.

15. The electrical switch according to claim 14, characterized in that: It also includes baffle 1, baffle 2 and baffle 3, wherein baffle 1 is arranged on the outside of guide plate 1, baffle 2 is arranged on the outside of guide plate 2, and baffle 3 is arranged on the outside of guide plate 3, baffle 1, baffle 2 and baffle 3 are respectively provided with exhaust holes, and metal mesh is arranged in the exhaust holes.

16. The electrical switch according to claim 15, characterized in that: The second baffle plate is provided with a guide slope, and the guide slope is located in the middle of the second baffle plate. The guide slope is used to guide the airflow to the exhaust holes on the upper and lower sides of the second baffle plate.

Images