Arc extinguishing system and isolating switch

Abstract

An arc extinguishing system and an isolating switch relate to the technical field of low-voltage electric appliances. The arc extinguishing system comprises a permanent magnet and a grid plate group. The grid plate group is positioned on at least one side of the third direction of the permanent magnet and is arranged at an interval with the permanent magnet; the attraction force of the permanent magnet to the electric arc generated at the moving contact and the static contact of the isolating switch is greater than the attraction force of the grid plate group to the electric arc generated at the moving contact and the static contact; and the permanent magnets are used for guiding the electric arc to the grid plate group under the magnetic field action of the permanent magnets. The arc extinguishing system and the disconnecting switch can improve the arc extinguishing capability of the arc extinguishing system.

Description

Technical Field

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

[0002] An isolating switch is a switching device mainly used for "isolating power sources, performing switching operations, and connecting and disconnecting small-current circuits". Depending on different application scenarios (such as indoor or outdoor applications), different isolation currents or voltages, and different functions, the designed structures are also different. The principle of the operating part of the isolating switch is generally: the energy storage spring is energized by rotating the handle, and then the contact part is driven to close and open by the release of the energy storage spring.

[0003] Currently, the requirements for the DC voltage of isolating switches are getting higher and higher. Some customers have put forward the demand for low-voltage electrical appliances with DC 2000 - 2500V. The existing isolating switches can no longer meet the customer requirements. Therefore, the isolating switches urgently need to be updated. As the DC power supply voltage of the updated isolating switch increases, correspondingly, in order to enable the isolating switch to extinguish high-voltage arcs, it is necessary to increase the number of arc extinguishing grid plates to improve the arc extinguishing ability of the arc extinguishing system. However, for conventional frame-type isolating switches, due to the small opening distance between the moving and static contacts, the space for placing arc extinguishing grid plates is limited. At the same time, considering the heat capacity and anti-burning characteristics of the arc extinguishing grid plates, the arc extinguishing grid plates cannot be too small. Therefore, how to provide a new arc extinguishing system to improve the arc extinguishing ability of the arc extinguishing system is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0004] The purpose of the present invention is to provide an arc extinguishing system and an isolating switch, which can improve the arc extinguishing ability of the arc extinguishing system.

[0005] The embodiments of the present invention are implemented as follows:

[0006] On one hand, the present invention provides an arc extinguishing system, which includes a permanent magnet and a grid plate group; the grid plate group is located on at least one side of the permanent magnet in the third direction and is arranged at intervals with the permanent magnet. The suction force of the permanent magnet on the arc generated at the moving contact and the static contact of the isolating switch is greater than the suction force of the grid plate group on the arc generated at the moving contact and the static contact; the permanent magnet is used to guide the arc to the grid plate group under the action of the magnetic field of the permanent magnet. The arc extinguishing system and the isolating switch can improve the arc extinguishing ability of the arc extinguishing system.

[0007] Optionally, the grid plate group includes a plurality of arc extinguishing grid plates arranged at intervals in the first direction, the two magnetic poles of the permanent magnet are arranged in the second direction, and the arrangement directions of the permanent magnet and the grid plate group, the first direction, and the second direction are perpendicular to each other in pairs.

[0008] Optionally, the permanent magnet is arranged on the first movement path, which is the movement path of the moving contact and the static contact during opening or closing.

[0009] Optionally, the grid plate group includes two sets, and the two sets of grid plate groups are respectively located on the opposite sides of the permanent magnet.

[0010] Optionally, the arc extinguishing system further includes a connection group, and the two sets of grid plate groups are connected by the connection group.

[0011] Optionally, one set of grid plate group, the connection group and the other set of grid plate group are connected in sequence to form a U-shaped structure, and the permanent magnet is located in the open cavity of the U-shaped structure.

[0012] Optionally, the arc extinguishing system further includes a moving arc guide plate arranged close to the moving contact of the disconnector. The moving arc guide plate is located on the same side of the two sets of grid plate groups, and the moving arc guide plate is used to guide the arc into the grid plate group.

[0013] Optionally, the arc extinguishing system further includes a static arc guide plate arranged close to the static contact of the disconnector. The static arc guide plate is located on the same side of the two sets of grid plate groups, and the static arc guide plate is used to guide the arc into the grid plate group.

[0014] On the other hand, the present invention provides a disconnector, which includes a contact mechanism and the above-mentioned arc extinguishing system. The contact mechanism includes a moving contact and a static contact, and the arc extinguishing system is used to extinguish the arc generated at the moving contact and the static contact.

[0015] Optionally, the moving contact is driven to rotate so that one end of it contacts or separates from the static contact to open or close the disconnector; or, the moving contact is driven to move linearly so that it contacts or separates from the static contact to open or close the disconnector.

[0016] The beneficial effects of the present invention include:

[0017] The arc extinguishing system provided by this application includes a permanent magnet and a grid plate group; the grid plate group is located on at least one side in the third direction of the permanent magnet and is arranged at intervals with the permanent magnet. The suction force of the permanent magnet on the arc generated at the moving contact and the static contact of the disconnecting switch is greater than the suction force of the grid plate group on the arc generated at the moving contact and the static contact. The permanent magnet is used to guide the arc to the grid plate group under the action of the magnetic field of the permanent magnet. Since this application adopts a hybrid arc extinguishing system combined with a permanent magnet and a grid plate group, and the suction force of the permanent magnet is greater than that of the grid plate group, in this way, under the action of the left-hand rule, when the moving contact and the static contact of the disconnecting switch are opened, the arc generated will be guided into the grid plate group located on one side of the permanent magnet by the magnetic field of the permanent magnet and extinguished by the grid plate group. Since this application uses a permanent magnet with a suction force greater than that of the grid plate group on the arc, on the one hand, under the same arc extinguishing ability, the arc extinguishing system of this application does not need to be as large in volume as the existing all-grid-plate arc extinguishing system, and the overall volume of the arc extinguishing system can be reduced; on the other hand, under the same volume, this application can arrange more arc extinguishing grid plates, and the arc extinguishing ability can be significantly improved compared with the existing all-grid-plate arc extinguishing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the arc extinguishing system provided by the embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the left-hand rule provided by the embodiment of the present invention;

[0021] Figure 3 It is one of the schematic structural diagrams of the arc extinguishing system provided by the embodiment of the present invention;

[0022] Figure 4 It is another schematic structural diagram of the arc extinguishing system provided by the embodiment of the present invention;

[0023] Figure 5 It is the third schematic structural diagram of the arc extinguishing system provided by the embodiment of the present invention.

[0024] Reference numerals: 10 - permanent magnet; 20 - grid plate group; 21 - arc extinguishing grid plate; a - first direction; b - second direction; c - third direction; 30 - connection group; 40 - moving arc guide piece; 50 - static arc guide piece; 200 - moving contact; 300 - static contact. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0029] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0030] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Driven by intelligent and automated high-tech, the smart home industry has entered a period of rapid development. The smart home industry is facing new challenges and opportunities in the transformation of technology, market and industry.

[0032] According to the function, the smart home can be divided into eight modules: entertainment system, security system, control system, lighting system, kitchen and bathroom appliance system, network and communication system, health care system, and indoor environment system. The eight modules work together to realize the whole house intelligence.

[0033] Please refer to Figure 1 and Figure 3 This embodiment provides an arc extinguishing system, which includes a permanent magnet 10 and a grid group 20; the grid group 20 is located on at least one side of the permanent magnet 10 in the third direction c and is arranged with a gap with the permanent magnet 10, and the attraction of the permanent magnet 10 on the arc generated at the moving contact 200 and the static contact 300 of the disconnector is greater than the attraction of the grid group 20 on the arc generated at the moving contact 200 and the static contact 300; the permanent magnet 10 is used to guide the arc to the grid group 20 under the action of the magnetic field of the permanent magnet 10. The arc extinguishing system and the disconnector can improve the arc extinguishing ability of the arc extinguishing system.

[0034] The arc extinguishing system provided in the present application is applied to a disconnector, and is used to extinguish a high-voltage arc generated when the disconnector is opened.

[0035] The arc extinguishing system includes a permanent magnet 10 and a grid group 20, wherein the permanent magnet 10 can generate a magnetic field. In the present embodiment, the suction force of the permanent magnet 10 on the arc generated at the moving contact 200 and the stationary contact 300 of the isolating switch is greater than the suction force of the grid group 20 on the arc generated at the moving contact 200 and the stationary contact 300 of the isolating switch. In short, the suction force of the permanent magnet 10 is greater than the suction force of the grid group 20.

[0036] The grid assembly 20 is located on one side of the permanent magnet 10 and is spaced apart from the permanent magnet 10. In the present application, the grid assembly 20 is arranged on one side of the permanent magnet 10 (the permanent magnet 10 and the grid assembly 20 are arranged along the third direction c), and since the suction force of the permanent magnet 10 is greater than the suction force of the grid assembly 20, when the disconnector is opened, the high-voltage arc generated at the moving contact 200 and the static contact 300 can be guided into the grid assembly 20 under the magnetic field of the permanent magnet 10, and thus extinguished by the grid assembly 20.

[0037] It should be noted that the permanent magnet 10 has a stronger suction force than the grid assembly 20, and can make the arc move in a predetermined direction. Figure 2 According to the left-hand rule shown in FIG. 1 , the current conduction direction of the moving contact 200 and the stationary contact 300 is Figure 1 The vertical direction of the permanent magnet 10 isFigure 1 in the direction perpendicular to the paper surface, so that the direction of the force (the moving direction of the arc) is Figure 1 the horizontal direction in. Therefore, according to the left-hand rule, the arc can be guided by the magnetic field to the grid group 20 located on one side of the permanent magnet 10, and thus be extinguished by the grid group 20. It should be understood that the arc generated at the moving contact 200 and the static contact 300 initially moves along the second direction b towards the direction close to the permanent magnet 10, and after being subjected to the force of the permanent magnet 10 along the third direction c, the arc turns into an arc shape and enters the grid group 20.

[0038] It is worth noting that since the grid group 20 of the present application is used to extinguish the arc guided by the permanent magnet 10, the installation position of the grid group 20 should follow the above-mentioned left-hand rule. For example, when the current direction is Figure 1 vertically upward in the orientation shown, and the magnetic induction intensity is into the paper perpendicular to the paper surface, correspondingly, the grid group 20 should be installed on the left side of the permanent magnet 10; another example is that when the current direction is Figure 1 vertically downward in the orientation shown, and the magnetic induction intensity is into the paper perpendicular to the paper surface, correspondingly, the grid group 20 should be installed on the right side of the permanent magnet 10.

[0039] That is to say, the specific arrangement direction of the grid group 20 and the permanent magnet 10 should be related to the direction of the magnetic induction intensity of the permanent magnet 10 and the current conduction direction of the moving contact 200 and the static contact 300. Those skilled in the art can determine it according to the left-hand rule, as long as the permanent magnet 10 can suck the arc to the permanent magnet 10 and guide the arc to the grid group 20 under the action of the magnetic field of the permanent magnet 10.

[0040] In addition, it should be noted that according to electromagnetic simulation, under the same volume condition, the magnetic force of the arc extinguishing system of the permanent magnet 10 is about 3 to 5 times that of the arc extinguishing system of the pure grid type, and the two are not at the same level. Since the present application uses the permanent magnet 10 and the arc suction force is large, therefore, on the one hand, under the same arc extinguishing ability, the arc extinguishing system of the present application does not need to be as large in volume as the existing all-grid type arc extinguishing system, and the overall volume of the arc extinguishing system can be reduced; on the other hand, under the same volume, the present application can arrange more arc extinguishing grids 21, and the arc extinguishing ability can be significantly improved compared with the existing all-grid type arc extinguishing system.

[0041] In summary, the arc extinguishing system provided by the present application includes a permanent magnet 10 and a grid plate group 20; the grid plate group 20 is located on at least one side of the permanent magnet 10 in the third direction and is arranged at intervals with the permanent magnet 10. The suction force of the permanent magnet 10 on the arc generated at the moving contact 200 and the static contact 300 of the disconnecting switch is greater than the suction force of the grid plate group 20 on the arc generated at the moving contact 200 and the static contact 300; the permanent magnet 10 is used to guide the arc to the grid plate group 20 under the action of the magnetic field of the permanent magnet 10. Since the present application adopts a hybrid arc extinguishing system combining the permanent magnet 10 and the grid plate group 20, and the suction force of the permanent magnet 10 is greater than that of the grid plate group 20, thus, under the action of the left-hand rule, when the moving contact 200 and the static contact 300 of the disconnecting switch are opened, the arc generated is guided into the grid plate group 20 located on one side of the permanent magnet 10 under the action of the magnetic field of the permanent magnet 10 and is extinguished by the grid plate group 20. Since the present application uses the permanent magnet 10 with a suction force on the arc greater than that of the grid plate group 20, therefore, on the one hand, under the same arc extinguishing ability, the arc extinguishing system of the present application does not need to be as large in volume as the existing all-grid-plate arc extinguishing system, and the overall volume of the arc extinguishing system can be reduced; on the other hand, under the same volume, the present application can arrange more arc extinguishing grid plates 21, and the arc extinguishing ability can be significantly improved compared with the existing all-grid-plate arc extinguishing system in the prior art.

[0042] Please refer to Figure 3 and Figure 4 , optionally, the grid plate group 20 includes a plurality of arc extinguishing grid plates 21 arranged at intervals along the first direction a, the two magnetic poles of the permanent magnet 10 are arranged along the second direction b, and the arrangement direction of the permanent magnet 10 and the grid plate group 20, the first direction a, and the second direction b are perpendicular to each other in pairs.

[0043] Among them, those skilled in the art can set the specific number of the above-mentioned plurality of arc extinguishing grid plates 21 according to the space of the disconnecting switch, and the present application does not make specific limitations on this.

[0044] The two magnetic poles of the permanent magnet 10 are arranged along the second direction b, and the second direction b can be the direction perpendicular to the paper surface and inward or the direction perpendicular to the paper surface and outward in Figure 1 , and the direction of the magnetic induction intensity of the permanent magnet 10 in Figure 1 is taken as an example of the direction perpendicular to the paper surface and inward for illustration.

[0045] The arrangement direction of the permanent magnet 10 and the grid plate group 20 is the Figure 1 third direction c in

[0046] Figure 3 Figure 3 andFigure 4 as shown

[0047] In this embodiment, when the disconnecting switch is non-polar, optionally, the above-mentioned grid plate group 20 may include two groups, and the two groups of grid plate groups 20 are respectively located on opposite sides of the permanent magnet 10. In this way, as Figure 1 shown, when the current conduction direction of the disconnecting switch is vertically upward and the magnetic induction intensity direction is perpendicular to the paper and into the paper, the left grid plate group 20 can be used for arc extinguishing; when the current conduction direction of the disconnecting switch is vertically downward and the magnetic induction intensity direction is perpendicular to the paper and into the paper, the right grid plate group 20 can be used for arc extinguishing.

[0048] Of course, if the disconnecting switch is polar, then only one group of grid plate group 20 can be provided at the corresponding position.

[0049] When the grid plate group 20 includes two groups, optionally, the arc extinguishing system may further include a connection group 30, and the two groups of grid plate groups 20 are connected by the connection group 30, as Figure 4 shown. That is to say, when the grid plate group 20 includes two groups, the two groups of grid plate groups 20 can be connected into a whole. Of course, the two groups of grid plate groups 20 and the connection group 30 can be connected by a connecting piece to form a whole, or can be integrally formed.

[0050] Optionally, one group of grid plate group 20, the connection group 30 and the other group of grid plate group 20 are connected in sequence to form a U-shaped structure, and the permanent magnet 10 is located in the open cavity of the U-shaped structure, as Figure 4 . This connection setting method can, on the one hand, facilitate installation, and on the other hand, increase the heat capacity.

[0051] Of course, the above two groups of grid plate groups 20 being a whole is only an example. In other feasible embodiments, the above two groups of grid plate groups 20 can also be independently arranged, as Figure 3 shown.

[0052] In order to assist in guiding the arc near the moving contact 200 in this application, so that the arc near the moving contact 200 is quickly guided into the arc extinguishing system, optionally, the arc extinguishing system further includes a moving arc guiding piece 40 arranged close to the moving contact 200 of the disconnecting switch. The moving arc guiding piece 40 is located on the same side of the two groups of grid plate groups 20, and the moving arc guiding piece 40 is used to guide the arc into the grid plate group 20.

[0053] Similarly, in order to assist in guiding the arc near the static contact 300, so that the arc near the static contact 300 is quickly guided into the arc extinguishing system, optionally, the arc extinguishing system further includes a static arc guiding piece 50 arranged close to the static contact 300 of the disconnecting switch. The static arc guiding piece 50 is located on the same side of the two groups of grid plate groups 20, and the static arc guiding piece 50 is used to guide the arc into the grid plate group 20.

[0054] Another aspect of the present invention provides an isolating switch, which includes a contact mechanism and the above-mentioned arc extinguishing system, wherein the contact mechanism includes a moving contact 200 and a stationary contact 300 , and the arc extinguishing system is used to extinguish the arc generated at the moving contact 200 and the stationary contact 300 .

[0055] It should be noted that the arc extinguishing system and the contact mechanism are arranged correspondingly, and the arc extinguishing system is arranged on the moving path of the arc of the contact mechanism, and is used to extinguish the arc generated by the moving contact 200 and the static contact 300 when the switch is opened. Since the specific structure and beneficial effects of the arc extinguishing system have been elaborated and explained in detail in the previous text, this application will not repeat them here.

[0056] Optionally, the moving contact 200 is driven to rotate so that one end of the moving contact 200 contacts or separates from the stationary contact 300, so as to open or close the isolating switch; or, the moving contact 200 is driven to move linearly so that it contacts or separates from the stationary contact 300, so as to open or close the isolating switch. In other words, the moving contact 200 of the above-mentioned contact mechanism can be closed or opened by rotating the moving contact 200 or by moving the moving contact 200 horizontally, such as Figure 5 shown.

[0057] The embodiment of the present application also provides an electrical equipment, which is equipped with the aforementioned isolating switch, and the electrical equipment can be equipped with at least one of the following: distribution box, cable, distribution cabinet, motor, switch socket, lamp, air conditioner, electric water heater, electric meter, camera, telephone, computer, etc. Such electrical equipment can use the related structure of the isolating switch of the present application to realize intelligent management, but it is not limited to the above intelligently managed electrical equipment, and can also be used in non-intelligent electrical equipment in traditional industries.

[0058] The embodiment of the present application also provides an electrical equipment, and the aforementioned isolating switch is applied to the electrical equipment. The electrical equipment can be used for whole-house intelligence, and can be applied to smart homes and the Internet of Things industry to achieve whole-house intelligent management.

[0059] It is understood that the above scenarios are only examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of the present application. The technical solutions of the present application can also be applied to other scenarios. For example, it is known to those skilled in the art that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0060] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0061] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0062] The units in the devices of the embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0063] In the present application, for the description of the same or similar term concepts, technical solutions, and / or application scenarios, generally only the first occurrence is described in detail. When they appear repeatedly later, for the sake of brevity, they are generally not described again. When understanding the technical solutions and other contents of the present application, for the same or similar term concepts, technical solutions, and / or application scenario descriptions that are not described in detail later, reference can be made to the relevant detailed descriptions before.

[0064] In the present application, the descriptions of the various embodiments have their own emphases. For the parts not described in detail or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0065] The technical features of the technical solutions of the present application can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in the present application.

[0066] The above are only optional embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0067] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention does not separately describe various possible combination methods.

Claims

1. An arc extinguishing system, characterized in that, It includes a permanent magnet (10) and a grid plate group (20); the grid plate group (20) is located on at least one side of the permanent magnet (10) in the third direction (c) and is arranged at intervals with the permanent magnet (10), and the suction force of the permanent magnet (10) on the arc generated at the moving contact (200) and the static contact (300) of the disconnecting switch is greater than the suction force of the grid plate group (20) on the arc generated at the moving contact (200) and the static contact (300); the permanent magnet (10) is used to guide the arc to the grid plate group (20) under the action of the magnetic field of the permanent magnet (10).

2. The arc extinguishing system according to claim 1, characterized in that, The grid plate group (20) includes a plurality of arc extinguishing grid plates (21) arranged at intervals in the first direction (a), two magnetic poles of the permanent magnet (10) are arranged in the second direction (b), and the arrangement direction of the permanent magnet (10) and the grid plate group (20), the first direction (a) and the second direction (b) are perpendicular to each other in pairs.

3. The arc extinguishing system according to claim 1, characterized in that, The permanent magnet (10) is arranged on a first movement path, and the first movement path is the movement path of the moving contact (200) and the static contact (300) when the disconnecting switch is opened or closed.

4. The arc extinguishing system according to any one of claims 1 to 3, characterized in that, The grid plate group (20) includes two groups, and the two groups of grid plate groups (20) are respectively located on opposite sides of the permanent magnet (10).

5. The arc extinguishing system according to claim 4, characterized in that, The arc extinguishing system further includes a connection group (30), and the two groups of grid plate groups (20) are connected through the connection group (30).

6. The arc extinguishing system according to claim 5, characterized in that One group of the grid plate group (20), the connection group (30) and the other group of the grid plate group (20) are connected in sequence to form a U-shaped structure, and the permanent magnet (10) is located in the open cavity of the U-shaped structure.

7. The arc extinguishing system according to claim 4, wherein The arc extinguishing system further includes a moving arc guiding piece (40) arranged close to the moving contact (200) of the disconnecting switch. The moving arc guiding piece (40) is located on the same side of the two groups of grid plate groups (20), and the moving arc guiding piece (40) is used to guide the arc into the grid plate group (20).

8. The arc extinguishing system according to claim 4, characterized in that, The arc extinguishing system further includes a static arc guiding piece (50) arranged close to the static contact (300) of the disconnecting switch. The static arc guiding piece (50) is located on the same side of the two groups of grid plate groups (20), and the static arc guiding piece (50) is used to guide the arc into the grid plate group (20).

9. An isolating switch, characterized in that, It includes a contact mechanism and the arc extinguishing system according to any one of claims 1 to 8. The contact mechanism includes a moving contact (200) and a static contact (300), and the arc extinguishing system is used to extinguish the arc generated at the moving contact (200) and the static contact (300).

10. The disconnecting switch according to claim 9, characterized in that, The moving contact (200) is driven to rotate so that one end of it contacts or separates from the static contact (300), so as to open or close the disconnecting switch; Or, the moving contact (200) is driven to move linearly so that it contacts or separates from the static contact (300), so as to open or close the disconnecting switch.

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