Arc extinguishing system and switching device

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an arc extinguishing system and a switching device. The arc extinguishing system is used for eliminating electric arcs generated when a moving contact and a static contact in the switching device are disconnected, and comprises an arc extinguishing chamber and an arc striking chamber communicated with the arc extinguishing chamber, a permanent magnet is arranged on one side, close to the moving contact, of the arc striking chamber in the first direction, and arc blowing plates are arranged on the two opposite sides of the permanent magnet in the second direction; the two blow-out plates and the permanent magnet form a first magnetic field, and the first magnetic field is used for quickly transferring the arc into the arc extinguish chamber; the two arc blowing plates, the permanent magnet and the moving contact form a second magnetic field, and the second magnetic field is used for attracting the moving contact, so that the moving contact is far away from the static contact. Wherein the first direction is the moving direction of the moving contact, and the second direction is perpendicular to the first direction. The arc extinguishing system can drive the arc to rapidly move into the arc extinguishing chamber through the external magnetic field for arc extinguishing, can improve the rapid breaking capacity between the moving contact and the static contact, reduces the risk of arc breakdown and reignition, and is good in arc extinguishing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing system and a switch device. Background Art

[0002] Low-voltage switchgear usually includes one or more moving contacts and one or more associated stationary contacts. When the switchgear performs the opening operation, an arc will be generated between the moving contact and the stationary contact. The arc has the characteristics of high temperature and heat, which will cause the temperature and pressure inside the device to increase. The arc needs to be dissipated as soon as possible to prevent damage to the moving and stationary contacts, the device itself, or the load being protected.

[0003] At present, the arc generated when the current is interrupted will be blown towards the arc extinguishing chamber driven by the arc's own magnetic field and extinguished in the arc extinguishing chamber. However, when a large short-circuit current occurs, the arc's own magnetic field is not enough to blow the entire arc into the arc extinguishing chamber, causing some hot gas to remain between the moving and static contacts or generate a new arc, which may cause the arc to last for a long time between the moving and static contacts, resulting in a reignition phenomenon, which will burn the material and even cause burning or explosion, seriously affecting the safety performance of the switchgear.

[0004] In the prior art, there is a method of applying an external permanent magnet to the arc, which applies an external magnetic field with a magnetic field strength significantly stronger than the arc's own magnetic field, so as to drive the arc to move quickly to the arc extinguishing chamber to be extinguished. Generally, the permanent magnet is set on one side of the static contact. The magnetic force of the permanent magnet will adsorb the dynamic contact bridge after the dynamic and static contacts are disconnected, thereby hindering the disconnection of the dynamic and static contacts, thereby affecting the opening distance between the dynamic and static contacts, resulting in easy arc breakdown.

[0005] Therefore, there is an urgent need to provide an arc extinguishing system and a switch device to solve the above technical problems. Utility Model Content

[0006] According to one aspect of the utility model, the utility model provides an arc extinguishing system, which can not only drive the arc to move quickly into the arc extinguishing chamber for arc extinguishing through an external magnetic field, but also improve the rapid disconnection capability between the moving and static contacts, reduce the risk of arc breakdown and reignition, and greatly improve the arc extinguishing effect.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] An arc extinguishing system, used for extinguishing an arc generated when a moving contact and a stationary contact in a switch device are disconnected, comprising an arc extinguishing chamber and an arc striking chamber connected to the arc extinguishing chamber, a permanent magnet is provided on one side of the arc striking chamber close to the moving contact along a first direction, and arc blowing plates are provided on opposite sides of the permanent magnet along a second direction, the first direction being a moving direction of the moving contact, and the second direction being perpendicular to the first direction;

[0009] The two arc blowing plates and the permanent magnet form a first magnetic field, and the first magnetic field is used to quickly transfer the arc into the arc extinguishing chamber; the two arc blowing plates, the permanent magnet and the moving contact form a second magnetic field, and the second magnetic field is used to attract the moving contact to keep the moving contact away from the static contact.

[0010] Optionally, the permanent magnet and the moving contact on the moving contact are arranged opposite to each other along the first direction.

[0011] Optionally, an integrated arc-striking plate is provided at the bottom of the arc extinguishing chamber and the arc-striking chamber, and the permanent magnet is arranged on the arc-striking plate; one of the two arc-blowing plates is an L-shaped first arc-blowing plate, and the other is a plate-shaped second arc-blowing plate, the bent section of the first arc-blowing plate is attached to the upper surface of the permanent magnet, and the bottom wall of the second arc-blowing plate is attached to the arc-striking plate.

[0012] Optionally, the arc extinguishing system also includes an arc isolation member, the middle of the arc isolation member is a cavity, forming the arc striking chamber, and the moving contact is movably arranged in the arc striking chamber; the arc isolation member includes two arc isolation walls opposite to each other along the second direction, the arc isolation walls and the arc blowing plates are arranged in a one-to-one correspondence, the arc blowing plates are placed on the side of the arc isolation wall away from the permanent magnet, and the arc blowing plates are not higher than the arc isolation wall along the first direction.

[0013] Optionally, a limiting installation groove is provided on a side of the arc isolation wall away from the permanent magnet, and the limiting installation groove is used to install the arc blowing plate.

[0014] Optionally, a limiting structure is provided at the bottom of the arc isolation member, the limiting structure has a limiting space, and the limiting space is used to fix the permanent magnet.

[0015] Optionally, an opening is provided at the top of the limiting space, and the opening is arranged opposite to the upper surface of the permanent magnet.

[0016] Optionally, a plurality of arc extinguishing grids are provided in the arc extinguishing chamber, and ends of the arc extinguishing grids extend into the arc striking chamber.

[0017] According to another aspect of the utility model, the utility model also provides a switching device, including a base, a static contact, a moving contact and the arc extinguishing system described in any of the above technical solutions, wherein the static contact is arranged on the top of the base, the moving contact is movably arranged on the base along a first direction and can contact or disconnect with the static contact, and the arc extinguishing system is arranged in the base for eliminating the arc generated when the moving contact and the static contact are disconnected.

[0018] Optionally, the moving contact includes a moving contact bridge extending along a third direction and moving contacts arranged at both ends of the moving contact bridge, each moving contact corresponds to a static contact, and the third direction is perpendicular to both the first direction and the second direction; two arc extinguishing systems are arranged along the third direction, and each arc extinguishing system corresponds to a pair of the moving contact and the static contact.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides an arc extinguishing system for eliminating the arc generated when the moving contact and the static contact in the switch device are disconnected, including an arc extinguishing chamber and an arc striking chamber. By arranging a permanent magnet and two arc blowing plates in the arc striking chamber, the permanent magnet and the two arc blowing plates form a first magnetic field, and the first magnetic field can pull the arc generated when the moving and static contacts are disconnected into the arc extinguishing chamber for arc extinguishing through magnetic attraction, so as to assist the arc's own magnetic field to accelerate the arc's movement speed, reduce the arc's retention time, and thus reduce the risk of restrike, breakdown and ablation. In addition, a second magnetic field is also formed between the permanent magnet, the two arc blowing plates and the moving contact, and the second magnetic field has an attractive force on the moving contact, and can accelerate the disconnection speed of the moving contact and the static contact when a short-circuit current occurs, and slow down the recovery speed of the moving contact during the resetting process of the moving contact, so as to ensure that the moving and static contacts have a sufficient opening distance when disconnected, and the arc has a sufficient extinguishing time, and also to a certain extent avoid the risk of arc breakdown and restrike, and the arc extinguishing effect is greatly improved.

[0021] The utility model also provides a switch device, comprising a base, a static contact, a moving contact and the above arc extinguishing system. The switch device has better short-circuit breaking capacity and safety performance due to the adoption of the above arc extinguishing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. 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 the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 An exploded schematic diagram of a switch device provided in an embodiment of the utility model;

[0024] Figure 2 A partial enlarged view of a cross-sectional view of a switch device provided by an embodiment of the utility model along one direction;

[0025] Figure 3 A cross-sectional view of the switch device provided by the embodiment of the utility model along another direction;

[0026] Figure 4 A partial enlarged view of a cross-sectional view of an arc striking chamber provided in an embodiment of the utility model;

[0027] Figure 5 An assembly diagram of an arc striking chamber and an arc extinguishing chamber provided for an embodiment of the utility model;

[0028] Figure 6 A schematic structural diagram of an arc isolation member provided in an embodiment of the utility model.

[0029] In the figure:

[0030] 100, arc extinguishing system; 110, arc extinguishing chamber; 111, arc extinguishing grid; 120, arc isolating member; 1201, arc isolating wall; 121, arc striking chamber; 122, permanent magnet; 123, arc blowing plate; 1231, first arc blowing plate; 1232, second arc blowing plate; 124, limiting structure; 1241, limiting space; 1242, open; 125, limiting mounting groove;

[0031] 200, moving contact; 210, moving contact bridge; 220, moving contact point;

[0032] 300, static contact; 310, static contact point;

[0033] 400, arc starting plate;

[0034] 500, base;

[0035] 600, contact support; 610, fixed sleeve; 620, switch button; 630, elastic member. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] This embodiment provides an arc extinguishing system, which is used in a switch device to extinguish the arc generated when the moving contact and the static contact in the switch device are disconnected. The arc extinguishing system can not only drive the arc to move quickly into the arc extinguishing chamber through an external magnetic field for arc extinguishing, but also improve the rapid disconnection capability between the moving and static contacts, reduce the risk of arc breakdown and reignition, and greatly improve the arc extinguishing effect.

[0041] Specifically, Figure 1-Figure 6 As shown, the arc extinguishing system 100 includes an arc extinguishing chamber 110 and an arc striking chamber 121 connected to the arc extinguishing chamber 110. The arc striking chamber 121 is used to blow the arc generated when the moving contact 200 and the static contact 300 are disconnected into the arc extinguishing chamber 110, and the arc extinguishing chamber 110 is used to extinguish the arc.

[0042] A permanent magnet 122 is provided on one side of the arc chamber 121 close to the moving contact 200 along the first direction, and arc blowing plates 123 are provided on both opposite sides of the permanent magnet 122 along the second direction. Figure 2-Figure 4 As shown, the first direction is the moving direction of the moving contact 200 , and the second direction is perpendicular to the first direction.

[0043] The two arc blowing plates 123 and the permanent magnet 122 form a first magnetic field ( Figure 4As shown by the arrow, the first magnetic field is used to quickly transfer the arc to the arc extinguishing chamber 110. Specifically, when a short circuit current occurs, the moving contact 200 and the static contact 300 will be disconnected, and the arc generated during the disconnection will be pulled into the arc extinguishing chamber 110 by the magnetic attraction force of the first magnetic field to extinguish the arc, so as to assist the arc's own magnetic field to accelerate the arc's movement speed, reduce the arc's residence time, and thus reduce the risk of restrike, breakdown and ablation.

[0044] The two arc blowing plates 123, the permanent magnet 122 and the moving contact 200 form a second magnetic field ( Figure 2 The second magnetic field is used to attract the moving contact 200 and keep the moving contact 200 away from the stationary contact 300. Specifically, when a short circuit current occurs, the moving contact 200 and the stationary contact 300 will be disconnected, and the second magnetic field will pull the moving contact 200 away from the stationary contact 300 through magnetic attraction, thereby accelerating the disconnection speed of the moving contact 200 and the stationary contact 300, and slowing down the recovery speed of the moving contact 200 during the resetting process of the moving contact 200, so as to ensure that the moving contact 200 and the stationary contact 300 have a sufficient opening distance when disconnected, and the arc has a sufficient extinguishing time, thereby avoiding the risk of arc breakdown and reignition to a certain extent, and greatly improving the arc extinguishing effect.

[0045] It is worth noting that when the moving contact 200 contacts the stationary contact 300 , the moving contact 200 is far away from the second magnetic field. At this time, the magnetic attraction of the second magnetic field on the moving contact 200 is small and will not affect the reliable contact between the moving contact 200 and the stationary contact 300 .

[0046] It is worth noting that, by providing the permanent magnet 122 , a magnetic field greater than or equal to 0.5 Tesla or greater than or equal to 1 Tesla can be generated, and the arc extinguishing effect is better.

[0047] It is worth noting that permanent magnets 122 of appropriate sizes or permanent magnets 122 of different magnetic properties can be provided according to the requirements of magnetic field strength.

[0048] Optionally, the arc blowing plate 123 is made of magnetic conductive material.

[0049] Optionally, continue to see Figure 2 The permanent magnet 122 may be disposed at a position opposite to the moving contact 200 along the first direction. This arrangement can improve the stability of the movement of the moving contact 200 when the second magnetic field adsorbs the moving contact 200 .

[0050] Optionally, continue to see Figure 2-Figure 5The bottom of the arc extinguishing chamber 110 and the arc striking chamber 121 is provided with an integrated arc striking plate 400, and the permanent magnet 122 is arranged on the arc striking plate 400. The arc striking plate 400 can play an arc striking effect and accelerate the movement speed of the arc to the arc extinguishing chamber 110. One of the two arc blowing plates 123 is an L-shaped first arc blowing plate 1231, and the other is a plate-shaped second arc blowing plate 1232. The bending section of the first arc blowing plate 1231 is attached to the upper surface of the permanent magnet 122, and the bottom wall of the second arc blowing plate 1232 is attached to the arc striking plate 400. In this way, the two arc blowing plates 123 and the permanent magnet 122 form a closed first magnetic field through the arc striking plate 400. The magnetic attraction of the closed first magnetic field is relatively large, and the arc striking effect is better.

[0051] In addition, the bent section of the first arc blowing plate 1231 is attached to the upper surface of the permanent magnet 122, and the lower surface of the permanent magnet 122 is attached to the arc starting plate 400, so that the magnetic attraction force can be increased by designing the upper and lower surfaces of the permanent magnet 122 to have larger areas without increasing the space occupied by the permanent magnet 122 in the first direction. To a certain extent, sufficient space is provided for the movement of the moving contact 200, thereby improving space utilization.

[0052] Optionally, the arc-starting plate 400 is made of a magnetic material, preferably a copper-clad steel plate. The copper-clad steel plate is easy to process directly, and the copper layer can accelerate the movement speed of the arc, thereby improving the arc extinguishing efficiency.

[0053] Further, see Figure 5 and Figure 6 The arc extinguishing system 100 further includes an arc-isolating member 120, the arc-isolating member 120 has a cavity in the middle, and forms an arc-strike chamber 121, and the moving contact 200 is movably disposed in the arc-strike chamber 121. The arc-isolating member 120 includes two arc-isolating walls 1201 opposite to each other along the second direction, and the arc-isolating walls 1201 are disposed in one-to-one correspondence with the arc-blowing plates 123, and the arc-blowing plates 123 are disposed on the side of the arc-isolating wall 1201 away from the permanent magnet 122, and the arc-blowing plates 123 are not higher than the arc-isolating walls 1201 along the first direction.

[0054] The arc blowing plate 123 is separated from the moving contact 200 by the arc isolation wall 1201, so as to avoid the moving contact 200 and the arc blowing plate 123 being in direct contact with each other with excessive adsorption force, which makes it difficult to separate and affects the movement of the moving contact 200.

[0055] It is worth noting that, under the effect of the first magnetic field, the arc blowing plate 123 will be closely attached to the arc isolation wall 1201, and there is no need to fix the arc blowing plate 123 through other structures.

[0056] It is worth mentioning that the material of the arc isolation member 120 is generally an insulating gas-generating material. This material can burn when the arc generated between the moving contact 200 and the static contact 300 is too large, and release a large amount of insulating gas. The insulating gas will form a high-pressure area to produce a gas blowing effect, blowing the arc to move quickly. At the same time, it can reduce the arc temperature, increase the arc voltage intensity, and thereby improve the breaking capacity of the switching device.

[0057] Further, see Figure 5 and Figure 6 A limiting installation groove 125 is provided on one side of the arc separation wall 1201 away from the permanent magnet 122, and the limiting installation groove 125 is used to install the arc blowing plate 123. By providing the limiting installation groove 125, the installation position of the arc blowing plate 123 can be pre-positioned, which is conducive to improving the installation efficiency of the arc blowing plate 123.

[0058] Further, see Figure 5 and Figure 6 A limiting structure 124 is provided at the bottom of the arc isolation member 120, and the limiting structure 124 has a limiting space 1241, and the limiting space 1241 is used to fix the permanent magnet 122. The permanent magnet 122 is fixed by the limiting space 1241, which facilitates the installation and removal of the permanent magnet 122 while ensuring the stability of the installation of the permanent magnet 122.

[0059] It is worth noting that in this embodiment, since the permanent magnet 122 is arranged on the arc-starting plate 400, the bottom of the limiting structure 124 has an opening, and the limiting structure 124 is buckled on the permanent magnet 122 through the opening, and the arc-starting plate 400 plays a role in supporting the permanent magnet 122.

[0060] Furthermore, in order to connect the arc striking plate 400 with the arc striking chamber 121 , the bottom of the arc isolating member 120 has a through hole.

[0061] Preferably, continue to see Figure 5 and Figure 6 The top of the limiting space 1241 is provided with an opening 1242, and the opening 1242 is arranged opposite to the upper surface of the permanent magnet 122. By providing the opening 1242, the upper surface of the permanent magnet 122 is exposed, which reduces the magnetic resistance, that is, it can increase the magnetic force of the first magnetic field and the second magnetic field, thereby improving the arc extinguishing effect.

[0062] Further, see Figure 2 and Figure 5 A plurality of arc extinguishing grids 111 are provided in the arc extinguishing chamber 110, and the ends of the arc extinguishing grids 111 extend into the arc striking chamber 121. Such an arrangement can shorten the movement path of the arc, thereby shortening the arc extinguishing time.

[0063] This embodiment also provides a switch device with good short-circuit breaking capacity and safety performance.

[0064] Specifically, see Figure 1-Figure 3 The switch device includes a base 500, a static contact 300, a moving contact 200 and the above-mentioned arc extinguishing system 100.

[0065] The static contact 300 is arranged on the top of the base 500, the moving contact 200 is movably arranged on the base 500 along the first direction and can contact or disconnect with the static contact 300, and the arc extinguishing system 100 is arranged in the base 500 for eliminating the arc generated when the moving contact 200 and the static contact 300 are disconnected.

[0066] Since the switch device adopts the above-mentioned arc extinguishing system 100, even if an excessively large short-circuit current occurs, all the arcs generated when the moving contact 200 and the stationary contact 300 are disconnected can be blown into the arc extinguishing chamber 110, and the arc is extinguished completely. The speed of blowing the arc is relatively fast, which greatly shortens the time the arc stays between the moving contact 200 and the stationary contact 300, thereby reducing the risk of reignition and ablation and improving the safety performance of the switch device.

[0067] Optionally, continue to see Figure 2 The moving contact 200 includes a moving contact bridge 210 extending along the third direction and moving contacts 220 arranged at both ends of the moving contact bridge 210, and each moving contact 220 is correspondingly provided with a static contact 310. Two arc extinguishing systems 100 are provided along the third direction, and each arc extinguishing system 100 is correspondingly provided with a pair of moving contacts 220 and static contacts 310. That is, an adapted number of arc extinguishing systems 100 can be provided according to the number of moving contacts 220 and static contacts 300 of the switch device to ensure the arc extinguishing effect.

[0068] It is worth noting that the third direction is perpendicular to the first direction and the second direction.

[0069] Optionally, the material of the moving contact bridge 210 is a magnetic material, such as a steel plate, a copper-clad steel plate or a copper-steel composite plate.

[0070] Further, see Figure 1 and Figure 3The switch device generally further includes a contact support 600, on which the moving contact 200 is mounted. The contact support 600 includes a fixed sleeve 610 and a switch button 620 slidably disposed in the fixed sleeve 610. The moving contact 200 is mounted on the switch button 620. An elastic member 630 is disposed between the bottom of the fixed sleeve 610 and the switch button 620. The elastic member 630 is compressed when the moving contact 200 is separated from the static contact 300, and resets the moving contact 200 through elastic restoring force. The second magnetic field formed by the permanent magnet 122, the two arc blowing plates 123 and the moving contact 200 can overcome the elastic force of the elastic member 630 to a certain extent and pull the moving contact 200 away from the static contact 300 quickly, thereby increasing the breaking speed of the moving contact 200 and the static contact 300, and slowing down the speed of the moving contact 200 contacting the static contact 300 when the moving contact 200 is reset, thereby providing sufficient time for arc extinguishing.

[0071] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An arc extinguishing system, used for extinguishing an arc generated when a moving contact (200) and a stationary contact (300) in a switch device are disconnected, characterized in that: It comprises an arc extinguishing chamber (110) and an arc striking chamber (121) connected to the arc extinguishing chamber (110), a permanent magnet (122) is provided on one side of the arc striking chamber (121) close to the moving contact (200) along a first direction, and arc blowing plates (123) are provided on two opposite sides of the permanent magnet (122) along a second direction, the first direction being the moving direction of the moving contact (200), and the second direction being perpendicular to the first direction; The two arc blowing plates (123) and the permanent magnet (122) form a first magnetic field, and the first magnetic field is used to quickly transfer the arc into the arc extinguishing chamber (110); the two arc blowing plates (123), the permanent magnet (122) and the moving contact (200) form a second magnetic field, and the second magnetic field is used to attract the moving contact (200) to keep the moving contact (200) away from the static contact (300).

2. The arc extinguishing system according to claim 1, characterized in that: The permanent magnet (122) and the moving contact point (220) on the moving contact (200) are arranged opposite to each other along the first direction.

3. The arc extinguishing system according to claim 1, characterized in that: An integrated arc striking plate (400) is provided at the bottom of the arc extinguishing chamber (110) and the arc striking chamber (121), and the permanent magnet (122) is arranged on the arc striking plate (400); one of the two arc blowing plates (123) is an L-shaped first arc blowing plate (1231), and the other is a plate-shaped second arc blowing plate (1232), a bent section of the first arc blowing plate (1231) is attached to the upper surface of the permanent magnet (122), and a bottom wall of the second arc blowing plate (1232) is attached to the arc striking plate (400).

4. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing system (100) further comprises an arc isolation member (120), the middle of the arc isolation member (120) is a cavity, forming the arc striking chamber (121), and the moving contact (200) is movably arranged in the arc striking chamber (121); the arc isolation member (120) comprises two arc isolation walls (1201) opposite to each other along the second direction, the arc isolation walls (1201) and the arc blowing plates (123) are arranged in a one-to-one correspondence, the arc blowing plates (123) are arranged on a side of the arc isolation wall (1201) away from the permanent magnet (122), and the arc blowing plates (123) are not higher than the arc isolation walls (1201) along the first direction.

5. The arc extinguishing system according to claim 4, characterized in that: A position limiting installation groove (125) is provided on the side of the arc isolation wall (1201) facing away from the permanent magnet (122), and the position limiting installation groove (125) is used to install the arc blowing plate (123).

6. The arc extinguishing system according to claim 4, characterized in that: A limiting structure (124) is provided at the bottom of the arc isolation member (120); the limiting structure (124) has a limiting space (1241); and the limiting space (1241) is used to fix the permanent magnet (122).

7. The arc extinguishing system according to claim 6, characterized in that: An opening (1242) is provided at the top of the limiting space (1241), and the opening (1242) is arranged opposite to the upper surface of the permanent magnet (122).

8. The arc extinguishing system according to claim 1, characterized in that: A plurality of arc extinguishing grids (111) are arranged in the arc extinguishing chamber (110), and ends of the arc extinguishing grids (111) extend into the arc striking chamber (121).

9. A switch device, characterized in that The invention comprises a base (500), a stationary contact (300), a moving contact (200) and an arc extinguishing system (100) according to any one of claims 1 to 8, wherein the stationary contact (300) is arranged on the top of the base (500), the moving contact (200) is movably arranged on the base (500) along a first direction and can contact or disconnect with the stationary contact (300), and the arc extinguishing system (100) is arranged in the base (500) for eliminating the arc generated when the moving contact (200) and the stationary contact (300) are disconnected.

10. The switch device according to claim 9, characterized in that The moving contact (200) comprises a moving contact bridge (210) extending along a third direction and moving contacts (220) arranged at two ends of the moving contact bridge (210), each moving contact (220) being provided with a corresponding stationary contact (310), and the third direction is perpendicular to both the first direction and the second direction; Two arc extinguishing systems (100) are provided along the third direction, and each arc extinguishing system (100) is provided corresponding to a pair of the moving contact (220) and the stationary contact (310).

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