Arc extinguishing device and automatic power transfer switch

Abstract

The present invention discloses an arc extinguishing device and an automatic power transfer switch, wherein the arc extinguishing device comprises two arc extinguishing chambers symmetrically arranged in opposite directions, and the arc extinguishing chambers comprise: an insulating partition structure and a plurality of arc extinguishing grids. The partition structure forms a chamber, and the chamber has an arc entry notch, and the arc entry notch comprises a first notch portion and a second notch portion. The opening directions of the first notch portions of the two arc extinguishing chambers are opposite, and the opening directions of the second notch portions of the two arc extinguishing chambers are the same. The plurality of arc extinguishing grids are arranged and installed in the chamber. The arc extinguishing device of the present invention has a simple structure, is easy to assemble, has a small space layout, achieves the purpose of reducing materials and costs, and is suitable for mass production.

Description

Technical Field

[0001] The invention relates to the technical field of arc extinguishing chambers, and in particular to an arc extinguishing device and an automatic power supply transfer switch. Background Art

[0002] The dual power automatic transfer switch is a common low-voltage electrical appliance in production and life. It is often used in important power distribution occasions to monitor power circuits (normal power supply and backup power supply or power generation power supply). When one power supply is detected to have deviations (overvoltage, undervoltage, loss of voltage or phase loss), it automatically switches to another normal power supply to ensure power supply continuity.

[0003] Most of the dual power automatic transfer switches in related technologies have a structure in which an operating conversion mechanism drives a multi-pole main switch (up to 4 poles) through a shaft to switch between two power sources. When the moving and static contacts in the main switch are disconnected during the switching process, the current path is suddenly interrupted, resulting in arc hazards that the switch equipment cannot withstand. Therefore, the arc extinguishing chamber is an important and necessary component in the entire automatic transfer switch.

[0004] At present, the arc extinguishing chamber in the dual power automatic transfer switch often uses a whole arc extinguishing grid to include one power supply moving and static contact assembly. First, the arc generated when the automatic transfer switch is switched will seriously burn the active contacts in the adjacent position, resulting in a shortened service life of the whole machine and serious performance degradation. Secondly, due to the influence of spatial layout, this design reduces the opening distance of the moving contact assembly, and the arc extinguishing effect is further deteriorated. Finally, this design layout will undoubtedly increase the size of the arc extinguishing grid, resulting in material waste and increased spatial layout. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an arc extinguishing device and an automatic power transfer switch in view of at least one defect of the related technology mentioned in the above background technology: the arc extinguishing chamber of the related technology will lead to material waste and increase the space layout.

[0006] The technical solution adopted by the present invention to solve the technical problem is: construct an arc extinguishing device, including two arc extinguishing chambers arranged symmetrically in opposite directions, and the arc extinguishing chambers include:

[0007] An insulating partition structure, wherein the partition structure is formed with a chamber, wherein the chamber has an arc entry notch, wherein the arc entry notch includes a first notch portion and a second notch portion; the opening directions of the first notch portions of the two arc extinguishing chambers are opposite, and the opening directions of the second notch portions of the two arc extinguishing chambers are the same; and,

[0008] A plurality of arc-extinguishing grids are arranged and installed in the chamber.

[0009] In some embodiments, a plurality of arc-extinguishing grids are arranged in a stepped manner, and an extended surface of the arc-extinguishing grid corresponds to the first notch portion.

[0010] In some embodiments, the arc-extinguishing grid is provided with a notch, and the notch faces the second notch portion;

[0011] The notches of the plurality of arc-extinguishing grids are arranged in a stepped manner in a direction away from the first notch portion and gradually approach the second notch portion.

[0012] In some embodiments, the partition structure includes:

[0013] A first arc-extinguishing chute, a second arc-extinguishing chute and a third arc-extinguishing chute, wherein the first arc-extinguishing chute and the second arc-extinguishing chute are arranged opposite to each other, and the third arc-extinguishing chute is an "L"-shaped structure, connected between the first arc-extinguishing chute and the second arc-extinguishing chute; the first arc-extinguishing chute, the second arc-extinguishing chute and the third arc-extinguishing chute jointly define the chamber having the arc entry gap.

[0014] The present invention also constructs an automatic power transfer switch, comprising any arc extinguishing device described above.

[0015] In some embodiments, the power automatic transfer switch further comprises:

[0016] A load connector, the load connector is used to connect the load terminal, and load static contacts are respectively provided on both sides of the load connector;

[0017] a first moving contact assembly, the first moving contact assembly being used to connect a first power terminal, the first moving contact assembly being located at an opening direction of a first notch portion of one of the arc extinguishing chambers of the arc extinguishing device, and partially extending into the corresponding arc extinguishing chamber; and,

[0018] A second moving contact assembly, the second moving contact assembly is used to connect a second power terminal, the second moving contact assembly is located at the opening direction of the first notch portion of another arc extinguishing chamber of the arc extinguishing device, and partially extends into the corresponding arc extinguishing chamber;

[0019] Wherein, the power automatic transfer switch has a double open state, a first closed state and a second closed state;

[0020] When the power automatic transfer switch is in the first closing state, the first moving contact assembly is connected to the load static contact on the corresponding side of the load connector, and the second moving contact assembly is disconnected from the load static contact on the corresponding side of the load connector;

[0021] When the power automatic transfer switch is in the second closing state, the first moving contact assembly is disconnected from the load static contact on the corresponding side of the load connector, and the second moving contact assembly is connected to the load static contact on the corresponding side of the load connector;

[0022] When the power automatic transfer switch is in the double-open state, the first moving contact assembly and the second moving contact assembly are disconnected from the load static contact of the load connector.

[0023] In some embodiments, the power automatic transfer switch further comprises:

[0024] An arc-striking member, wherein the two arc-extinguishing chambers are respectively provided with the arc-striking member, and the arc-striking member is fixed to the load connecting member;

[0025] The first moving contact assembly and the second moving contact assembly respectively include:

[0026] Active contact, the active contact is located outside the arc extinguishing chamber, the active contact is used to connect or disconnect with the load static contact on the corresponding side of the load connector; and

[0027] A moving arc-striking contact, wherein the moving arc-striking contact is located in the arc extinguishing chamber and can move in the arc extinguishing chamber, wherein the moving arc-striking contact is used to connect or disconnect with an arc-striking member in the corresponding arc extinguishing chamber, and wherein the arc-striking member is used to direct the arc generated when the moving arc-striking contact is disconnected to a position away from the moving arc-striking contact.

[0028] In some embodiments, the arc-starting member comprises:

[0029] an arc-striking static contact, the arc-striking static contact being used to connect or disconnect with the moving arc-striking contact; and

[0030] An arc-striking plate, wherein the arc-striking plate extends from the arc-striking static contact to the arc-extinguishing grid farthest from the first notch in the arc-extinguishing chamber.

[0031] In some embodiments, the arc-striking static contact is horizontally arranged, and the load static contact of the load connector is inclined.

[0032] In some embodiments, the length of the moving arc-striking contact is greater than the length of the active contact.

[0033] By implementing the present invention, the following beneficial effects are achieved:

[0034] The arc extinguishing device of the present invention has a simple structure, is easy to assemble, has a small space layout, achieves the purpose of reducing materials and costs, and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1 A structural diagram of an embodiment of an arc extinguishing device of the present invention is shown;

[0037] Figure 2 A left side view of an embodiment of the arc extinguishing device of the present invention is shown;

[0038] Figure 3 A right side view of an embodiment of the arc extinguishing device of the present invention is shown;

[0039] Figure 4 A structural diagram of an embodiment of the automatic power transfer switch of the present invention is shown;

[0040] Figure 5 The structure diagram of one embodiment of the moving contact assembly of the automatic power transfer switch of the present invention is shown. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0043] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "located at", and "located at" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or a chemical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The function of the arc extinguishing chamber is to provide a closed space when the contacts are disconnected, so that the arc can be quickly cooled and extinguished in a limited space, thereby protecting the switchgear from damage and ensuring the safety of operation.

[0046] like Figure 1 As shown, some embodiments of the present invention disclose an arc extinguishing device 1, which is applied to an automatic power transfer switch. The arc extinguishing device 1 includes two arc extinguishing chambers 11 that are symmetrically arranged in opposite directions. The two arc extinguishing chambers 11 respectively include: an insulating partition structure 111 and a plurality of arc extinguishing grids 113. It can be understood that the plurality of grids can be two, three or any number, as follows:

[0047] The partition structure 111 is formed with a chamber 112, and the chamber 112 has an arc entry notch 1121, and the arc entry notch 1121 includes a first notch portion 1121a and a second notch portion 1121b. The opening directions of the first notch portions 1121a of the two arc extinguishing chambers 11 are opposite, and the opening directions of the second notch portions 1121b of the two arc extinguishing chambers 11 are the same. A plurality of arc extinguishing grids 113 are arranged and installed in the chamber 112.

[0048] The arc extinguishing device 1 has a simple structure, is easy to assemble, has a small space layout, achieves the purpose of reducing materials and costs, and is suitable for mass production.

[0049] It should be noted here that the arc entry notch 1121 is a completely through notch, so the first notch portion 1121a and the second notch portion 1121b are adjacent and connected. Specifically, the first notch portion 1121a and the second notch portion 1121b are located on two adjacent sides of the chamber 112, for example, the opening direction of the first notch portion 1121a is perpendicular to the opening direction of the second notch portion 1121b, forming an "L"-shaped arc entry notch 1121.

[0050] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the plurality of arc-extinguishing grids 113 are arranged in a stepped manner, and the extended surface of the arc-extinguishing grid 113 corresponds to the first notch portion 1121a. For example, the extended surface of the arc-extinguishing grid 113 is a plane and is parallel to the plane where the first notch portion 1121a is located.

[0051] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the arc extinguishing grid 113 is provided with a notch 1131, and the notch 1131 faces the second notch portion 1121b. The notches 1131 of the arc extinguishing grids 113 are arranged in a step-like manner away from the first notch portion 1121a and gradually approach the second notch portion 1121b.

[0052] In some embodiments, such as Figure 1 As shown, the partition structure 111 includes: a first arc-extinguishing partition 1111, a second arc-extinguishing partition 1112 and a third arc-extinguishing partition 1113. The first arc-extinguishing partition 1111 and the second arc-extinguishing partition 1112 are arranged opposite to each other, and the third arc-extinguishing partition 1113 is an "L"-shaped structure, connected between the first arc-extinguishing partition 1111 and the second arc-extinguishing partition 1112. The first arc-extinguishing partition 1111, the second arc-extinguishing partition 1112 and the third arc-extinguishing partition 1113 jointly define a chamber 112 having an arc-entry notch 1121, specifically a rectangular chamber 112 and an "L"-shaped arc-entry notch 1121.

[0053] In some embodiments, such as Figure 1 As shown, the arc quenching grid 113 is connected to the first arc quenching chute 1111 and the second arc quenching chute 1112. For example, the arc quenching grid 113 is riveted to the first arc quenching chute 1111 and the second arc quenching chute 1112. The riveting here is only an example and is not intended to limit the present application. Other methods are also possible.

[0054] In some embodiments, such as Figure 1 As shown, the arc extinguishing device 1 further includes: a fourth arc extinguishing chute 1114. The first arc extinguishing chute 1111 of the two arc extinguishing chambers 11 is connected to the fourth arc extinguishing chute 1114. For example, the first arc extinguishing chute 1111 of the two arc extinguishing chambers 11 is connected to the fourth arc extinguishing chute 1114 by nut locking, and the nut locking here is only an example and is not intended to limit the present application, and other methods may also be used.

[0055] In some embodiments, the first arc-extinguishing cleft 1111, the second arc-extinguishing cleft 1112, the third arc-extinguishing cleft 1113 and the fourth arc-extinguishing cleft 1114 are plates made of flame-retardant materials, such as melamine boards or red steelboards, etc. The melamine boards and red steelboards here are only examples and are not intended to limit the present application. Other materials may also be used.

[0056] In some embodiments, such as Figure 1As shown, a plurality of openings 1113a are provided on the partition structure 111 (specifically, on the third arc-extinguishing partition 1113) opposite to the second notch portion 1121b. The plurality of openings 1113a are of the same size and evenly distributed. When an arc is generated, the high-temperature and high-pressure gas can be discharged through the plurality of openings 1113a after instantaneous expansion, thereby ensuring that the power automatic transfer switch operates normally. For example, the opening 1113a is a circular hole, which is only an example and is not intended to limit the present application. Other openings are also possible.

[0057] like Figure 4 As shown, some embodiments of the present invention disclose an automatic power transfer switch, specifically a dual power automatic transfer switch, including the arc extinguishing device 1 described in any of the above embodiments.

[0058] In some embodiments, such as Figure 4 As shown, the power automatic transfer switch also includes: a load connector 2, a first moving contact assembly 3a and a second moving contact assembly 3b, which are specifically as follows:

[0059] The load connector 2 is used to connect the load terminals, and load static contacts 21 are respectively provided on both sides of the load connector 2 .

[0060] The first moving contact assembly 3 a is used to connect the first power terminal. The first moving contact assembly 3 a is located at the opening direction of the first notch portion 1121 a of one of the arc extinguishing chambers 11 of the arc extinguishing device 1 , and partially extends into the corresponding arc extinguishing chamber 11 .

[0061] The second moving contact assembly 3 b is used to connect the second power terminal. The second moving contact assembly 3 b is located at the opening direction of the first notch portion 1121 a of another arc extinguishing chamber 11 of the arc extinguishing device 1 , and partially extends into the corresponding arc extinguishing chamber 11 .

[0062] The power automatic transfer switch has two open states, a first closed state and a second closed state, as follows:

[0063] When the power automatic transfer switch is in the first closing state, the first moving contact assembly 3a is connected to the load static contact 21 on the corresponding side of the load connector 2, and the second moving contact assembly 3b is disconnected from the load static contact 21 on the corresponding side of the load connector 2.

[0064] When the power automatic transfer switch is in the second closing state, the first moving contact assembly 3a is disconnected from the load static contact 21 on the corresponding side of the load connector 2, and the second moving contact assembly 3b is connected to the load static contact 21 on the corresponding side of the load connector 2.

[0065] When the power automatic transfer switch is in the double-open state, the first moving contact assembly 3a and the second moving contact assembly 3b are disconnected from the load static contact 21 on the corresponding side of the load connector 2.

[0066] For example, Figure 4 Taking the orientation shown as an example, the first moving contact assembly 3a and the second moving contact assembly 3b are respectively located on the left and right sides of the arc extinguishing device 1, and the load static contacts 21 are respectively provided on the left and right sides of the load connector 2. The first moving contact assembly 3a is used to connect or disconnect with the load static contact 21 on the left side of the load connector 2, and the second moving contact assembly 3b is connected or disconnected with the load static contact 21 on the right side of the load connector 2. Arc extinguishing chambers 11 are respectively provided at the front and rear of the arc extinguishing device 1, and part of the first moving contact assembly 3a extends into the arc extinguishing chamber 11 in front, and part of the second moving contact assembly 3b extends into the arc extinguishing chamber 11 in the rear, and the arc generated when the first moving contact assembly 3a or the second moving contact assembly 3b is disconnected from the load static contact 21 is quickly cooled and extinguished through the arc extinguishing chamber 11.

[0067] In some embodiments, such as Figure 4 As shown, the arc extinguishing device 1 is arranged at the middle position inside the automatic power transfer switch, and the arc extinguishing device 1 is arranged on the load connector 2. For example, the middle of both sides of the load connector 2 is concave, and the second notch portion 1121b of the arc extinguishing device 1 is installed in the middle of the load connector 2. It can be understood that before the arc extinguishing device 1 is installed, the first moving contact assembly 3a and the second moving contact assembly 3b are already located on both sides of the load connector 2. When the arc extinguishing device 1 is installed, parts of the first moving contact assembly 3a and the second moving contact assembly 3b extend into the arc extinguishing chamber 11 from the corresponding second notch portion 1121b respectively.

[0068] In some embodiments, such as Figure 4 As shown, the first moving contact assembly 3a and the second moving contact assembly 3b can swing around the axial direction, that is, as shown in FIG. Figure 4 The position shown swings up and down to connect or disconnect with the load static contact 21 on the corresponding side of the load connecting piece 2, and its axial direction is perpendicular to the symmetry axis of the two arc extinguishing chambers 11.

[0069] In some embodiments, such as Figure 4 As shown, the power automatic transfer switch further includes an arc-starting member 4. The arc-starting members 4 are respectively arranged in the two arc-extinguishing chambers 11, and the arc-starting members 4 are fixed to the load connecting member 2, for example, the arc-starting member 4 is arranged in the middle of the load connecting member 2.

[0070] like Figure 4 and Figure 5As shown, the first moving contact assembly 3a and the second moving contact assembly 3b respectively include: an active contact 31 and a moving arc contact 32. The active contact 31 is located outside the arc extinguishing chamber 11, and the active contact 31 is used to connect or disconnect with the load static contact 21 on the corresponding side of the load connector 2. The moving arc contact 32 is located in the arc extinguishing chamber 11 and can move in the arc extinguishing chamber 11. The moving arc contact 32 is used to connect or disconnect with the arc striking member 4 in the corresponding arc extinguishing chamber 11. The arc striking member 4 is used to lead the arc generated when disconnecting from the moving arc contact 32 to a place away from the moving arc contact 32, so as to ensure the life of the moving arc contact 32 and the active contact 31 to the greatest extent.

[0071] Among them, when the automatic power transfer switch is in the first closing state, the active contact 31 of the first moving contact assembly 3a is connected with the load static contact 21 on the corresponding side of the load connector 2, the moving arc-striking contact 32 of the first moving contact assembly 3a is connected with the arc-striking member 4 in the corresponding arc extinguishing chamber 11, the active contact 31 of the second moving contact assembly 3b is disconnected from the load static contact 21 on the corresponding side of the load connector 2, and the moving arc-striking contact 32 of the second moving contact assembly 3b is disconnected from the arc-striking member 4 in the corresponding arc extinguishing chamber 11.

[0072] When the automatic power transfer switch is in the second closing state, the active contact 31 of the first moving contact assembly 3a is disconnected from the load static contact 21 on the corresponding side of the load connector 2, the moving arc-striking contact 32 of the first moving contact assembly 3a is disconnected from the arc-striking member 4 in the corresponding arc extinguishing chamber 11, and the active contact 31 of the second moving contact assembly 3b is connected to the load static contact 21 on the corresponding side of the load connector 2, and the moving arc-striking contact 32 of the second moving contact assembly 3b is connected to the arc-striking member 4 in the corresponding arc extinguishing chamber 11.

[0073] When the automatic power transfer switch is in the double-split state, the active contact 31 of the first moving contact assembly 3a is disconnected from the load static contact 21 on the corresponding side of the load connector 2, the moving arc-striking contact 32 of the first moving contact assembly 3a is disconnected from the arc-striking member 4 in the corresponding arc extinguishing chamber 11, the active contact 31 of the second moving contact assembly 3b is disconnected from the load static contact 21 on the corresponding side of the load connector 2, and the moving arc-striking contact 32 of the second moving contact assembly 3b is disconnected from the arc-striking member 4 in the corresponding arc extinguishing chamber 11.

[0074] In some embodiments, the movable arc-striking contact 32 extends from the arc-entering notch 1121 into the arc-extinguishing chamber 11 , and can swing in the direction from the first notch portion 1121 a to the second notch portion 1121 b .

[0075] In some embodiments, such as Figure 4As shown, the arc-striking member 4 includes: an arc-striking static contact 41 and an arc-striking sheet 42. The arc-striking static contact 41 is used to connect or disconnect with the moving arc-striking contact 32. The arc-striking sheet 42 extends from the arc-striking static contact 41 to the arc-striking grid sheet 113 farthest from the first notch portion 1121a in the arc-extinguishing chamber 11. That is, the bottom A of the arc-striking sheet 42 is close to the moving arc-striking contact 32, so as to facilitate the initial stage of the arc to be directed to itself after the arc is ignited for the first time. The upper end B of the arc-striking sheet 42 is set at the farthest end from the moving arc-striking contact 32 to ensure that the arc is directed away from the moving arc-striking contact 32. After the arc is pulled apart, it is cut into short arcs by multiple arc-striking grid sheets 113, and the arc extinguishing effect is enhanced by increasing the voltage drop in the near-pole region, thereby ensuring the life of the moving arc-striking contact 32 and the active contact 31 to the greatest extent.

[0076] In some embodiments, such as Figure 4 As shown, the arc-striking static contact 41 is horizontally arranged, and the load static contact 21 of the load connector 2 is tilted. This structural design allows the moving arc-striking contact 32 to meet the condition of closing before opening, which is specifically manifested as follows: at the moment when the active contact 31 and the load static contact 21 are just disconnected, the moving arc-striking contact 32 and the arc-striking static contact 41 are not disconnected, and the power circuit is still in the connected state. When the active contact 31 continues to rise for a distance, the moving arc-striking contact 32 is disconnected from the arc-striking static contact 41. At this time, an arc will be generated at the position where the moving arc-striking contact 32 is disconnected. The arc extinguishing effect acts on the moving arc-striking contact 32 alone, which greatly reduces the arc erosion of the adjacent active contact 31, thereby increasing the service life and ensuring the performance.

[0077] In some embodiments, such as Figure 5 As shown, the first moving contact assembly 3a and the second moving contact assembly 3b respectively include: at least two active contacts 31 and a moving arcing contact 32. It can be understood that the at least two can be two, three or any number. The at least two active contacts 31 are arranged in sequence in the axial direction around which the moving contact assembly is wound.

[0078] In addition, the length L1 of the moving arc-striking contact 32 is greater than the length L2 of the active contact 31 so that it can extend into the arc extinguishing chamber 11. In this way, most of the arc generated is borne by the moving arc-striking contact 32, and the arc extinguishing chamber 11 is responsible for extinguishing the arc, thereby protecting the active contact 31 from the defect of shortening the life of the entire machine due to arc erosion.

[0079] In some embodiments, such as Figure 4 As shown, when the moving arc-striking contact 32 is in contact with the arc-striking static contact 41 and is closed, the moving arc-striking contact 32 is perpendicular to the arc-extinguishing grid 113 .

[0080] By implementing the present invention, the following beneficial effects are achieved:

[0081] The arc extinguishing device 1 of the present invention has a simple structure, is easy to assemble, has a small space layout, achieves the purpose of reducing materials and costs, and is suitable for mass production.

[0082] It is understandable that the above embodiments only express some implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope of the claims of the present invention.

Claims

1. An arc extinguishing device, characterized in that: The invention comprises two arc extinguishing chambers (11) which are symmetrically arranged in opposition to each other, and the arc extinguishing chambers (11) comprise: An insulating partition structure (111), the partition structure (111) forming a chamber (112), the chamber (112) having an arc entry notch (1121), the arc entry notch (1121) comprising a first notch portion (1121a) and a second notch portion (1121b); the opening directions of the first notch portions (1121a) of the two arc extinguishing chambers (11) are opposite, and the opening directions of the second notch portions (1121b) of the two arc extinguishing chambers (11) are the same; and, A plurality of arc-extinguishing grids (113) are arranged and installed in the chamber (112).

2. The arc extinguishing device according to claim 1, characterized in that: A plurality of arc-extinguishing grids (113) are arranged in a stepped manner, and an extended surface of the arc-extinguishing grid (113) corresponds to the first notch portion (1121a).

3. The arc extinguishing device according to claim 2, characterized in that: The arc extinguishing grid (113) is provided with a notch (1131), and the notch (1131) faces the second notch portion (1121b); The notches (1131) of the plurality of arc-extinguishing grids (113) are arranged in a stepped manner in a direction away from the first notch portion (1121a) and gradually approach the second notch portion (1121b).

4. The arc extinguishing device according to claim 1, characterized in that: The partition structure (111) comprises: A first arc-extinguishing chute (1111), a second arc-extinguishing chute (1112) and a third arc-extinguishing chute (1113), wherein the first arc-extinguishing chute (1111) and the second arc-extinguishing chute (1112) are arranged opposite to each other, and the third arc-extinguishing chute (1113) is an "L"-shaped structure, connected between the first arc-extinguishing chute (1111) and the second arc-extinguishing chute (1112); the first arc-extinguishing chute (1111), the second arc-extinguishing chute (1112) and the third arc-extinguishing chute (1113) jointly define the chamber (112) having the arc entry notch (1121).

5. A power automatic transfer switch, characterized in that: It comprises the arc extinguishing device as described in any one of claims 1 to 4.

6. The automatic power transfer switch according to claim 5, characterized in that: The power automatic transfer switch also includes: A load connector (2), the load connector (2) being used to connect a load terminal, and load static contacts (21) being respectively provided on both sides of the load connector (2); a first moving contact assembly (3a), the first moving contact assembly (3a) being used for connecting a first power terminal, the first moving contact assembly (3a) being located in the opening direction of a first notch portion (1121a) of one of the arc extinguishing chambers (11) of the arc extinguishing device, and partially extending into the corresponding arc extinguishing chamber (11); and, A second moving contact assembly (3b), the second moving contact assembly (3b) being used for connecting a second power supply terminal, the second moving contact assembly (3b) being located in the opening direction of a first notch portion (1121a) of another arc extinguishing chamber (11) of the arc extinguishing device, and partially extending into the corresponding arc extinguishing chamber (11); Wherein, the power automatic transfer switch has a double open state, a first closed state and a second closed state; When the power automatic transfer switch is in a first closing state, the first moving contact assembly (3a) is connected to the load static contact (21) on the corresponding side of the load connector (2), and the second moving contact assembly (3b) is disconnected from the load static contact (21) on the corresponding side of the load connector (2); When the power automatic transfer switch is in a second closing state, the first moving contact assembly (3a) is disconnected from the load static contact (21) on the corresponding side of the load connector (2), and the second moving contact assembly (3b) is connected to the load static contact (21) on the corresponding side of the load connector (2); When the power automatic transfer switch is in a double-open state, the first moving contact assembly (3a) and the second moving contact assembly (3b) are both disconnected from the load static contact (21) of the load connector (2).

7. The automatic power transfer switch according to claim 6, characterized in that: The power automatic transfer switch also includes: An arc-striking member (4), wherein the two arc-extinguishing chambers (11) are respectively provided with the arc-striking member (4), and the arc-striking member (4) is fixed to the load connecting member (2); The first moving contact assembly (3a) and the second moving contact assembly (3b) respectively include: an active contact (31), the active contact (31) being located outside the arc extinguishing chamber (11), the active contact (31) being used to connect or disconnect with a load static contact (21) on a corresponding side of the load connecting member (2); and, A movable arc-striking contact (32), the movable arc-striking contact (32) being located in the arc-extinguishing chamber (11) and being movable in the arc-extinguishing chamber (11), the movable arc-striking contact (32) being used to connect or disconnect with an arc-striking member (4) in the corresponding arc-extinguishing chamber (11), the arc-striking member (4) being used to direct an arc generated when disconnecting from the movable arc-striking contact (32) away from the movable arc-striking contact (32).

8. The automatic power transfer switch according to claim 7, characterized in that: The arc-starting member (4) comprises: an arc-striking static contact (41), the arc-striking static contact (41) being used to connect or disconnect with the moving arc-striking contact (32); and An arc-striking plate (42), the arc-striking plate (42) extending from the arc-striking static contact (41) to the arc-extinguishing grid plate (113) in the arc-extinguishing chamber (11) that is farthest from the first notch portion (1121a).

9. The automatic power transfer switch according to claim 8, characterized in that: The arc-striking static contact (41) is arranged horizontally, and the load static contact (21) of the load connecting piece (2) is arranged obliquely.

10. The automatic power transfer switch according to claim 7, characterized in that: The length of the moving arc-striking contact (32) is greater than the length of the active contact (31).

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