Multi-grid switch unit and rotary switch

Abstract

The utility model discloses a multi-grid switch unit and a rotary switch. One end of a first static contact arc striking part is connected with a first static contact contact part, and the other end of the first static contact arc striking part is connected with a first static contact connecting part; the inner side of the first arc extinguish chamber is provided with a first magnetic system assembly, and the inner side of the second arc extinguish chamber is provided with a second magnetic system assembly. The inner sides of the first arc extinguish chamber and the second arc extinguish chamber are arc-shaped; a first insulating arc-isolating cover is arranged on the inner side of the first magnetizer, a first permanent magnet is arranged in the first magnetizer, and the first permanent magnet is fixedly connected with a third magnetizer. According to the utility model, the space of the arc extinguish chamber and the number of the metal grid sheets can be increased under the condition of limited volume of the switch unit, electromagnetic force for driving an arc to move towards the arc extinguish chamber is generated by utilizing a structure that the arc magnetizer is matched with the permanent magnet and the static contact arc striking part, and the arc voltage is obviously improved; on the premise that the size of the switch unit is not changed, the voltage grade of breaking arc of the switch unit is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a multi-grid switch unit and a rotary switch. Background Art

[0002] The rotary switch is a common structure in isolating switches. As an important electrical component in the circuit system, it plays a key role in control and protection. For applications such as photovoltaic power generation and energy storage, rotary switches usually adopt a multi-layer stacked structure to cope with the interruption of DC current. However, with the continuous increase in the voltage of photovoltaic and energy storage systems, how to improve the voltage level that can be interrupted by a single-layer switch unit without changing the size through structural design and optimization is of great significance to the comprehensive performance improvement, structural reduction and cost reduction of the rotary switch, and it is also a challenge for the design of rotary switches.

[0003] The patent publication number is CN219832464U, and the name is a patent application for a rotary switch, which includes a housing and a moving contact assembly, a static contact assembly, and an arc extinguishing chamber. The two ends of the moving contact constitute two moving contact parts. The static contact assembly includes two static contacts respectively located on both sides of the moving contact assembly. The static contact has an upper and lower open clamping structure to form a clamping cavity for accommodating the moving contact part located in the closed position. The two moving contact parts are raised relative to the outer peripheral surface of the insulating rotating frame. The arc extinguishing chamber has an entrance, and the disconnected end of the moving contact part can extend into the arc extinguishing chamber. The static contact of the utility model is designed as an open clamping structure, and the moving contact is lengthened and thinned, so that the two moving contact parts protruding relative to the insulating rotating frame are clamped by the static contact from the upper and lower sides when closing the switch, and can be directly extended into the arc extinguishing chamber during the process of turning to open the switch. This design is more conducive to the arc on the moving contact being adsorbed on the arc extinguishing sheet of the arc extinguishing chamber when disconnecting, and the arc extinguishing effect is better. The static contact of this patent application is provided with a clamping cavity for accommodating the moving contact part in the closed position. The moving contact is a single-piece conductive contact fixed in an insulating rotating frame. The rest is the conventional structure of switches of this category. The arc is drawn only by the moving and static contacts, and the arc is extinguished in the arc extinguishing chamber. The arc voltage that can be achieved is not high, and it can only disconnect low voltages. Utility Model Content

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a multi-grid switch unit and a rotary switch, which can increase the arc extinguishing chamber space and the number of metal grids as much as possible within the limited volume of the switch unit, and at the same time utilize the structure of an arc-shaped magnetic conductor with a toothed extension structure, a permanent magnet, and an arc-starting part of a static contact to generate an electromagnetic force to drive the arc into the arc extinguishing chamber, thereby solving the problem of increasing the voltage level of the switch unit breaking the arc without changing the volume of the switch unit, thereby promoting the improvement of the comprehensive performance of the rotary switch, the reduction of the structure, and the reduction of the cost.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A multi-grid switch unit, comprising:

[0007] A housing, the housing comprising a bottom plate;

[0008] A moving contact bracket, the moving contact bracket is mounted on the bottom plate of the housing;

[0009] A moving contact, the moving contact being rotatably mounted inside the moving contact bracket;

[0010] A first arc extinguishing chamber, wherein the first arc extinguishing chamber is arranged outside the moving contact support, and a second arc extinguishing chamber is arranged on the opposite side of the first arc extinguishing chamber along the center of the moving contact support;

[0011] A first stationary contact assembly, wherein the first stationary contact assembly is arranged outside the moving contact bracket, and a second stationary contact assembly is arranged on the opposite side of the first stationary contact assembly along the center of the moving contact bracket;

[0012] Among them, the first static contact assembly includes a first static contact arc-striking part, one end of the first static contact arc-striking part is connected to the first static contact contact part, and the other end is connected to the first static contact connecting part, and the first static contact contact part faces the moving contact; the structure of the second static contact assembly is the same as that of the first static contact assembly; the inner side of the first arc-extinguishing chamber is installed with a first magnetic system assembly, and the inner side of the second arc-extinguishing chamber is installed with a second magnetic system assembly; the inner sides of the first arc-extinguishing chamber and the second arc-extinguishing chamber are both arc-shaped; the first magnetic system assembly includes a first magnetic conductor, the inner side of the first magnetic conductor is provided with a first insulating arc-isolating cover, the first magnetic conductor is arc-shaped, a first permanent magnet is provided inside the first magnetic conductor, the first permanent magnet is fixedly connected with a third magnetic conductor, and the other end of the third magnetic conductor is in contact with the first static contact arc-striking part; the structure of the second magnetic system assembly is the same as that of the first magnetic system assembly, and a fourth magnetic conductor is provided inside the second magnetic system assembly.

[0013] Optionally, the moving contact support is disc-shaped, a rotating shaft is provided inside the moving contact support, and the moving contact is connected to the rotating shaft of the moving contact support.

[0014] Optionally, the moving contact is a plate, and a first moving contact portion and a second moving contact portion are respectively provided at two ends of the moving contact.

[0015] Optionally, the first polarity surface of the first permanent magnet faces the side of the arc-striking portion of the first static contact facing away from the first arc-extinguishing chamber, and the second polarity surface of the first permanent magnet faces the bottom of the first magnetic conductor.

[0016] Optionally, the first magnetic conductor includes a first side wall and a second side wall parallel to each other, and two ends of the first permanent magnet are respectively connected to the first side wall and the second side wall.

[0017] Optionally, a first tooth-like extension portion is provided on the side wall of the first side wall facing the closing movement area of ​​the contact part between the moving contact and the first stationary contact, and the first tooth-like extension portion is one or more; a second tooth-like extension portion is provided on the side wall of the second side wall facing the closing movement area of ​​the contact part between the moving contact and the first stationary contact, and the second tooth-like extension portion is one or more.

[0018] Optionally, the first insulating arc isolation cover includes a first insulating arc isolation wall and a second insulating arc isolation wall, which respectively cover the inner side of the first side wall and the inner side of the second side wall of the first magnetic conductive arc structure.

[0019] Optionally, the first arc extinguishing chamber has a plurality of first metal grids spaced apart from each other, and two ends of the first metal grids are respectively vertically fixedly connected with two first fixing clamps.

[0020] Optionally, the axial direction of the first stationary contact connecting portion is perpendicular to the axial direction of the first stationary contact contact portion.

[0021] A rotary switch comprises a plurality of stacked multi-grid switch units.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The utility model utilizes a static contact arc-starting portion and a multi-grid arc-extinguishing chamber design to increase the arc-extinguishing chamber space and the number of metal grids within the limited volume of the switch unit as much as possible. At the same time, in order to solve the problem of the arc being elongated as much as possible and entering the arc-extinguishing grids, an arc-shaped magnetic conductor with a toothed extension structure and a permanent magnet, as well as a structure coordinated with the static contact arc-starting portion, are utilized to generate an electromagnetic force that drives the arc to move toward the arc-extinguishing chamber, and is independent of the direction of the arc current. Further, the arc voltage is significantly increased through the cooling and cutting effect of the metal grids on the arc, thereby solving the problem of increasing the voltage level of the arc breaking of the switch unit under the premise of keeping the volume size of the switch unit unchanged, thereby promoting the improvement of the comprehensive performance of the rotary switch, the reduction of the structure, and the reduction of the cost.

[0024] The utility model arranges arc-shaped magnetic conductors and permanent magnets on both sides of the moving range of the moving and static contacts to provide non-polarity magnetic drive for the moving and static contacts, which can significantly increase the arc voltage and thus improve product performance.

[0025] Furthermore, the insulating arc-isolating wall in the magnetic system component of the utility model will also produce gas that is beneficial to cooling the arc temperature under the high temperature of the arc. The gas also helps to drive the arc into the arc extinguishing chamber, thereby increasing the arc voltage more quickly and effectively extinguishing the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0027] Figure 1 A schematic diagram of an embodiment of the utility model;

[0028] Figure 2 It is an exploded schematic diagram of an embodiment of the utility model;

[0029] Figure 3 It is an internal schematic diagram of an embodiment of the utility model;

[0030] Figure 4 This is a schematic diagram of the position of the static contact of an embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of a first magnetic system component of an embodiment of the utility model;

[0032] Figure 6 It is a schematic diagram of a third magnetic conductor in an embodiment of the utility model;

[0033] Figure 7 It is a schematic diagram of a second magnetic system component of an embodiment of the present utility model;

[0034] Figure 8 It is a schematic diagram of a moving contact bracket according to an embodiment of the utility model;

[0035] Among them, 1. Shell;

[0036] 2. first stationary contact assembly; 21. first stationary contact contact portion; 22. first stationary contact arc striking portion; 23. first stationary contact connecting portion;

[0037] 3. Second static contact assembly; 31. Second static contact contact portion; 32. Second static contact arc striking portion; 33. Second static contact connecting portion;

[0038] 4. Moving contact; 41. First contact portion of the moving contact; 42. Second contact portion of the moving contact; 5. Moving contact bracket;

[0039] 6. First arc extinguishing chamber; 61. First metal grid; 62. First fixing clamp;

[0040] 7. Second arc extinguishing chamber; 71. Second metal grid; 72. Second fixing clamp;

[0041] 8. First magnetic system component; 81. First permanent magnet; 82. First magnetic conductor; 821. First side wall; 8211. First tooth-shaped extension; 822. Second side wall; 8221. Second tooth-shaped extension; 83. First insulating arc shield; 831. First insulating arc wall; 832. Second insulating arc wall;

[0042] 9. Second magnetic system component; 91. Second permanent magnet; 92. Second magnetic conductor; 921. Third side wall; 922. Fourth side wall; 93. Second insulating arc shield; 9211. Third tooth-shaped extension; 9221. Fourth tooth-shaped extension; 931. Third insulating arc wall; 932. Fourth insulating arc wall;

[0043] 10. The third magnetic conductor; 11. The fourth magnetic conductor. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0045] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] The utility model is described in detail below in conjunction with the accompanying drawings.

[0048] like Figure 1 and Figure 2 As shown, a multi-grid switch unit of the utility model includes a shell 1, a first static contact assembly 2, a second static contact assembly 3, a moving contact 4, a moving contact bracket 5, a first arc extinguishing chamber 6, a second arc extinguishing chamber 7, a first magnetic system assembly 8, a second magnetic system assembly 9, a third magnetic conductor 10 and a fourth magnetic conductor.

[0049] like Figure 3 and Figure 4 As shown, the first stationary contact assembly 2 and the second stationary contact assembly 3 are both arranged on the bottom plate of the shell 1, the shell 1 is a rectangular shell, and the first stationary contact assembly 2 and the second stationary contact assembly 3 are respectively arranged at two diagonal positions of the shell 1.

[0050] The first stationary contact assembly 2 includes a first stationary contact contact portion 21, a first stationary contact arc-striking portion 22 and a first stationary contact connecting portion 23; one end of the first stationary contact arc-striking portion 22 is connected to the first stationary contact contact portion 21, and the other end is connected to the first stationary contact connecting portion 23. The other end of the first stationary contact connecting portion 23 is vertically connected to the inner wall of the housing 1. The axial direction of the first stationary contact connecting portion 23 is perpendicular to the axial direction of the first stationary contact contact portion 21. The first stationary contact contact portion 21, the first stationary contact arc-striking portion 22 and the first stationary contact connecting portion 23 are all plate parts and are all arranged horizontally.

[0051] The second static contact assembly 3 includes a second static contact contact portion 31, a second static contact arc-striking portion 32, and a second static contact connecting portion 33; one end of the second static contact arc-striking portion 32 is connected to the second static contact contact portion 31, and the other end is connected to the second static contact connecting portion 33. The other end of the second static contact connecting portion 33 is vertically connected to the inner wall of the housing 1. The structure of the second static contact assembly 3 is the same as that of the first static contact assembly 2.

[0052] The two ends of the moving contact 4 have a first moving contact portion 41 and a second moving contact portion 42. The first moving contact portion 41 and the second moving contact portion 42 are connected by a connecting member, which is a plate or a rod, and the center of the connecting member is fixed to the center of the moving contact bracket 5.

[0053] The moving contact bracket 5 is rotatably connected to the center of the housing 1 , and the moving contact bracket 5 can perform rotational motion relative to the housing 1 .

[0054] like Figure 8As shown, the moving contact 4 is installed inside the moving contact bracket 5, and the moving contact 4 realizes the contact and separation action of the moving contact first contact part 41 and the first stationary contact contact part 21, and the contact and separation action of the moving contact second contact part 42 and the second stationary contact contact part 31 through rotational motion.

[0055] The first arc extinguishing chamber 6 and the second arc extinguishing chamber 7 are symmetrically arranged in the housing 1 .

[0056] The first arc extinguishing chamber 6 is arranged in a fan-shaped extension area formed by the first contact portion 41 of the moving contact and the first contact portion 21 of the static contact when the moving contact 4 rotates. The first arc extinguishing chamber 6 has a plurality of first metal grids 61 spaced apart from each other, and two first fixing clamps 62 are respectively and vertically fixedly connected at both ends of the first metal grid 61. The first metal grid 61 is arranged along the extension area of ​​the opening and closing movement area of ​​the first contact portion 41 of the moving contact and the first static contact contact 21.

[0057] The second arc extinguishing chamber 7 is arranged in a fan-shaped extension area formed by the second contact portion 42 of the moving contact and the second contact portion 31 of the static contact when the moving contact 4 rotates; the first arc extinguishing chamber 6 and the second arc extinguishing chamber 7 have the same structure; the second arc extinguishing chamber 7 has a plurality of second metal grids 71 ​​spaced apart from each other, and two second fixing clamps 72 are respectively and vertically fixedly connected at both ends of the second metal grid 71. The second metal grid 71 is arranged along the extension area of ​​the opening and closing movement area of ​​the second contact portion 42 of the moving contact and the second static contact contact portion 31.

[0058] like Figure 5 and Figure 6 As shown, the first magnetic system component 8 and the second magnetic system component 9 are symmetrically arranged in the housing 1 , and the first magnetic system component 8 includes a first permanent magnet 81 , a first magnetic conductor 82 and a first insulating arc shield 83 .

[0059] The first polarity surface of the first permanent magnet 81 faces the side of the first static contact arc-striking portion 22 facing away from the first arc-extinguishing chamber 6. The second polarity surface of the first permanent magnet 81 faces the bottom of the first magnetic conductor 82 and is fixedly contacted and connected with the third magnetic conductor 10. The other end of the third magnetic conductor 10 contacts the first static contact arc-striking portion 22, and the third magnetic conductor 10 is parallel to the grid of the first arc-extinguishing chamber 6.

[0060] The first magnetizer 82 is an arc-shaped structure, and the first permanent magnet 81 is placed inside the arc-shaped structure of the first magnetizer 82. The first magnetizer 82 includes a first side wall 821 and a second side wall 822 of the same structure and size, and the first side wall 821 and the second side wall 822 are both arc-shaped extensions of the arc-shaped trajectory of the opening and closing movement of the first contact portion 41 of the moving contact. The first side wall 821 and the second side wall 822 are arranged between the opening and closing movement area of ​​the first contact portion 41 of the moving contact and the first static contact contact portion 21 and the first metal grid 61.

[0061] One end of the first permanent magnet 81 is vertically connected to the first side wall 821 , and the other end of the first permanent magnet 81 is vertically connected to the second side wall 822 .

[0062] The first side wall 821 has a first tooth-shaped extension portion 8211 toward the opening and closing movement area of ​​the first contact portion 41 of the moving contact and the first static contact portion 21, and the first tooth-shaped extension portion 8211 is one or more; the second side wall 822 has a second tooth-shaped extension portion 8221 toward the opening and closing movement area of ​​the first contact portion 41 of the moving contact and the first static contact portion 21, and the second tooth-shaped extension portion 8221 is one or more.

[0063] The first tooth-shaped extension portion 8211 and the second tooth-shaped extension portion 8221 extend on both sides of the opening and closing movement area of ​​the first contact portion 41 of the moving contact, so that the arc generated between the first contact portion 41 of the moving contact and the first static contact portion 21 is between the first tooth-shaped extension portion 8211 and the second tooth-shaped extension portion 8221.

[0064] The first insulating arc isolation cover 83 includes a first insulating arc isolation wall 831 and a second insulating arc isolation wall 832, which respectively cover the inner side of the first side wall 821 and the inner side of the second side wall 822 of the arc-shaped structure of the first magnetic conductor 82, thereby insulating the arc burning area of ​​the first arc extinguishing chamber 6 from the first magnetic conductor 82.

[0065] like Figure 7As shown, the second magnetic system component 9 includes a second permanent magnet 91, a second magnetic conductor 92, and a second insulating arc-isolating cover 93. The first polarity surface of the second permanent magnet 91 faces the side of the second static contact arc-starting portion 32 that is opposite to the second arc-extinguishing chamber 7. The second magnetic conductor 92 is an arc-shaped structure. The second permanent magnet 91 is placed inside the arc-shaped structure of the second magnetic conductor 92. The second polarity surface of the second permanent magnet 91 faces the bottom of the arc-shaped structure of the second magnetic conductor 92, and is in contact with the fourth magnetic conductor 11. The third side wall 921 and the fourth side wall 922 have the same structural dimensions. The third side wall 921 is an arc-shaped extension of the arc-shaped trajectory of the opening and closing movement of the second contact portion 42 of the moving contact, and the fourth side wall 922 is an arc-shaped extension of the arc-shaped trajectory of the opening and closing movement of the second contact portion 42 of the moving contact.

[0066] The third side wall 921 has a third tooth-shaped extension portion 9211 toward the opening and closing movement area of ​​the second contact portion 42 of the moving contact and the second static contact connecting portion 33, and the third tooth-shaped extension portion 9211 is one or more; the fourth side wall 922 has a fourth tooth-shaped extension portion 9221 toward the opening and closing movement area of ​​the second contact portion 42 of the moving contact and the second static contact connecting portion 33, and the fourth tooth-shaped extension portion 9221 is one or more.

[0067] The third tooth-shaped extension portion 9211 of the third side wall 921 and the fourth tooth-shaped extension portion 9221 of the fourth side wall 922 of the second magnetic conductor 92 extend on both sides of the opening and closing movement area of ​​the second contact portion 42 of the moving contact, so that the arc generated between the second contact portion 42 of the moving contact and the second static contact connecting portion 33 is between the third tooth-shaped extension portion 9211 and the fourth tooth-shaped extension portion 9221.

[0068] The third side wall 921 and the fourth side wall 922 are arranged between the opening and closing movement area of ​​the second moving contact portion 42 and the second stationary contact portion 31 and the second metal grid 71 of the second arc extinguishing chamber 7 .

[0069] The second insulating arc isolation cover 93 has a third insulating arc isolation wall 931 and a fourth insulating arc isolation wall 932, which respectively cover the inner side of the third side wall 921 and the inner side of the fourth side wall 922 of the arc structure of the second magnetic conductor 92, thereby insulating the arc burning area of ​​the second arc extinguishing chamber 7 from the second magnetic conductor 92.

[0070] One end of the fourth magnetic conductor 11 is in contact with the arc-striking portion 32 of the second static contact, and the other end is parallel to the grid of the adjacent second arc-extinguishing chamber 7 .

[0071] The utility model discloses a multi-grid switch unit, when used:

[0072] When the switch is closed, the moving contact 4 rotates 90 degrees clockwise, and the two ends of the moving contact 4 are respectively connected to the first static contact contact portion 21 and the second static contact contact portion 31.

[0073] When opening the circuit breaker, the moving contact 4 rotates counterclockwise, and the moving contact 4 is separated from the first static contact assembly 2 and the second static contact assembly 3. During the separation process, the first magnetic system assembly 8 and the second magnetic system assembly 9 will provide a non-polar magnetic field force on the one hand, driving the arc generated between the moving contact 4 and the first static contact assembly 2 and the second static contact assembly 3 to move toward the first arc extinguishing chamber 6 and the second arc extinguishing chamber 7. On the other hand, the first insulating arc isolation cover 83 and the second insulating arc isolation cover 93 in the first magnetic system assembly 8 and the second magnetic system assembly 9 will also produce gas that is beneficial to cooling the arc temperature under the high temperature of the arc. The gas also helps to drive the arc into the first arc extinguishing chamber 6 and the second arc extinguishing chamber 7, thereby increasing the arc voltage more quickly and effectively extinguishing the arc.

[0074] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A multi-gate switch unit, characterized in that: include: A housing (1), the housing (1) comprising a bottom plate; A moving contact bracket (5), the moving contact bracket (5) being mounted on a bottom plate of the housing (1); A moving contact (4), the moving contact (4) being rotatably mounted inside the moving contact support (5); A first arc extinguishing chamber (6), wherein the first arc extinguishing chamber (6) is arranged outside the moving contact support (5), and a second arc extinguishing chamber (7) is arranged on the opposite side of the first arc extinguishing chamber (6) along the center of the moving contact support (5); A first stationary contact assembly (2), wherein the first stationary contact assembly (2) is arranged outside the moving contact bracket (5), and a second stationary contact assembly (3) is arranged on the opposite side of the first stationary contact assembly (2) along the center of the moving contact bracket (5); The first stationary contact assembly (2) comprises a first stationary contact arc-striking portion (22), one end of the first stationary contact arc-striking portion (22) is connected to a first stationary contact contact portion (21), and the other end is connected to a first stationary contact connecting portion (23), and the first stationary contact contact portion (21) faces the moving contact (4); the structure of the second stationary contact assembly (3) is the same as that of the first stationary contact assembly (2); a first magnetic system assembly (8) is installed on the inner side of the first arc-extinguishing chamber (6), and a second magnetic system assembly (9) is installed on the inner side of the second arc-extinguishing chamber (7); the first arc-extinguishing chamber (6) and the second arc-extinguishing chamber (7) are The inner sides are all arc-shaped; the first magnetic system component (8) includes a first magnetic conductor (82), the inner side of which is provided with a first insulating arc-isolating cover (83); the first magnetic conductor (82) is arc-shaped, the interior of the first magnetic conductor (82) is provided with a first permanent magnet (81), the first permanent magnet (81) is fixedly connected with a third magnetic conductor (10), and the other end of the third magnetic conductor (10) is in contact with the arc-starting portion (22) of the first static contact; the second magnetic system component (9) has the same structure as the first magnetic system component (8), and the second magnetic system component (9) is provided with a fourth magnetic conductor (11).

2. A multi-grid switch unit according to claim 1, characterized in that: The moving contact support (5) is disc-shaped, has a rotating shaft inside the moving contact support (5), and the moving contact (4) is connected to the rotating shaft of the moving contact support (5).

3. The multi-grid switch unit according to claim 1, characterized in that: The moving contact (4) is a plate member, and a moving contact first contact portion (41) and a moving contact second contact portion (42) are respectively provided at two ends of the moving contact (4).

4. The multi-grid switch unit according to claim 1, characterized in that: The first polarity surface of the first permanent magnet (81) faces the side of the first stationary contact arc-striking portion (22) facing away from the first arc-extinguishing chamber (6), and the second polarity surface of the first permanent magnet (81) faces the bottom of the first magnetic conductor (82).

5. The multi-grid switch unit according to claim 1, characterized in that: The first magnetic conductor (82) comprises a first side wall (821) and a second side wall (822) which are parallel to each other, and two ends of the first permanent magnet (81) are respectively connected to the first side wall (821) and the second side wall (822).

6. A multi-grid switch unit according to claim 5, characterized in that: A first tooth-shaped extension portion (8211) is provided on the side wall of the first side wall (821) facing the opening and closing movement area between the moving contact (4) and the first stationary contact contact portion (21), and the first tooth-shaped extension portion (8211) is one or more; a second tooth-shaped extension portion (8221) is provided on the side wall of the second side wall (822) facing the opening and closing movement area between the moving contact (4) and the first stationary contact contact portion (21), and the second tooth-shaped extension portion (8221) is one or more.

7. The multi-grid switch unit according to claim 5, characterized in that: The first insulating arc-isolating cover (83) comprises a first insulating arc-isolating wall (831) and a second insulating arc-isolating wall (832), which respectively cover the inner side of the first side wall (821) and the inner side of the second side wall (822) of the arc-shaped structure of the first magnetic conductor (82).

8. The multi-grid switch unit according to claim 1, characterized in that: The first arc extinguishing chamber (6) comprises a plurality of first metal grids (61) spaced apart from each other, and two first fixing clamping plates (62) are respectively vertically fixedly connected to two ends of the first metal grid (61).

9. The multi-grid switch unit according to claim 1, characterized in that: The axial direction of the first stationary contact connecting portion (23) is perpendicular to the axial direction of the first stationary contact contact portion (21).

10. A rotary switch, characterized in that: A multi-gate switch unit according to any one of claims 1 to 8 having a plurality of stacked arrangements.

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