CN117894615A - Multi-grid switch unit, use method and rotary switch - Google Patents

Abstract

The invention discloses a multi-grid switch unit, a using method and a rotary switch, wherein one end of a first fixed contact arc striking part is connected with a first fixed contact part, and the other end of the first fixed contact arc striking part is connected with a first fixed contact connecting part; the inner side of the first arc-extinguishing chamber is provided with a first magnetic system component, and the inner side of the second arc-extinguishing chamber is provided with a second magnetic system component; the inner sides of the first arc-extinguishing chamber and the second arc-extinguishing chamber are arc-shaped; the inner side of the first magnetizer is provided with a first insulating arc-isolating cover, the inside of the first magnetizer is provided with a first permanent magnet, and the first permanent magnet is fixedly connected with a third magnetizer. According to the invention, under the limited volume of the switch unit, the space of the arc-extinguishing chamber and the number of metal grid sheets can be increased, meanwhile, the structure of the arc-shaped magnetizer, the permanent magnet and the fixed contact arc striking part are utilized to generate electromagnetic force for driving the arc to move towards the arc-extinguishing chamber, so that the remarkable improvement of the arc voltage is realized, and the voltage level of the breaking arc of the switch unit is improved on the premise that the volume and the size of the switch unit are unchanged.

Description

Multi-grid switch unit, use method and rotary switch

Technical Field

The invention belongs to the technical field of piezoelectric devices, and particularly relates to a multi-grid switch unit, a using method and a rotary switch.

Background

The rotary switch is a relatively common structure in the isolating switch, and is used as an important electrical element in a circuit system to play a key role in control and protection. For photovoltaic power generation, energy storage and other applications, rotary switches generally adopt a structure with multiple layers stacked to cope with breaking of direct current. However, along with the continuous improvement of the voltage of the photovoltaic and energy storage systems, how to improve the voltage level of the single-layer switch unit which can be disconnected on the premise of unchanged volume size through structural design and optimization has important significance on the improvement of the comprehensive performance, the reduction of the structure and the reduction of the cost of the rotary switch, and is also a challenge of the design of the rotary switch.

The patent publication number is CN219832464U, and the name is a rotary switch's patent application, including casing and moving contact subassembly, static contact subassembly, explosion chamber, two moving contact's both ends constitute two moving contact parts, and the static contact subassembly includes two static contacts that are located moving contact subassembly both sides respectively, two upper and lower opening clamping structure have on the static contact, form the centre gripping chamber that is used for holding the moving contact part that is located the combined floodgate position, and two moving contact parts are protruding relative insulating revolving rack outer peripheral face, and the explosion chamber has the entry, and the breaking end of moving contact part can stretch into the explosion chamber. The static contact is designed into an opening clamping structure, and the moving contact is lengthened and thinned, so that two moving contact parts which are raised relative to the insulating rotating frame are clamped by the static contact from the upper side and the lower side during closing, and can directly extend into an arc extinguishing chamber in the process of turning to switch off. The static contact of the patent application is provided with a clamping cavity for accommodating a movable contact part positioned at a closing position, and the movable contact is a single-piece conductive contact piece fixed in an insulating rotating frame; the other parts are conventional structures of the switch, the arc is drawn only by the moving and static contacts, and the arc is extinguished by the arc-extinguishing chamber, so that the arc voltage is low, and only the low voltage can be cut off.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention aims to provide a multi-grid switch unit, a use method and a rotary switch, wherein under the limited volume of the switch unit, the space of an arc extinguishing chamber and the number of metal grids are increased as much as possible, meanwhile, an arc magnetizer with a toothed extension structure, a permanent magnet and an arc striking part of a fixed contact are utilized to cooperate to generate electromagnetic force to drive an arc into the arc extinguishing chamber, so that the voltage level of the breaking arc of the switch unit is improved on the premise that the volume size of the switch unit is unchanged, and the comprehensive performance of the rotary switch is promoted, the structure is reduced and the cost is reduced.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a multi-gate switching unit comprising:

a housing comprising a base plate;

the movable contact support is arranged on the bottom plate of the shell;

the movable contact is rotatably arranged in the movable contact bracket;

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 center of the moving contact support along the first arc-extinguishing chamber;

the first fixed contact assembly is arranged outside the movable contact support, and a second fixed contact assembly is arranged on the opposite side of the first fixed contact assembly along the center of the movable contact support;

the first fixed contact assembly comprises a first fixed contact arc striking part, one end of the first fixed contact arc striking part is connected with a first fixed contact part, the other end of the first fixed contact arc striking part is connected with a first fixed contact connecting part, and the first fixed 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; a first magnetic system component is arranged on the inner side of the first arc extinguishing chamber, and a second magnetic system component is arranged on the inner side of the second arc extinguishing chamber; the inner sides of the first arc-extinguishing chamber and the second arc-extinguishing chamber are arc-shaped; the first magnetic system component comprises a first magnetizer, a first insulating arc-isolating cover is arranged on the inner side of the first magnetizer, the first magnetizer is arc-shaped, a first permanent magnet is arranged in the first magnetizer, the first permanent magnet is fixedly connected with a third magnetizer, and the other end of the third magnetizer is in contact with the arc striking part of the first static contact; the second magnetic system component has the same structure as the first magnetic system component, and a fourth magnetizer is arranged in the second magnetic system component.

Optionally, the moving contact support is disc-shaped, a rotating shaft is arranged in the moving contact support, and the moving contact is connected with the rotating shaft of the moving contact support.

Optionally, the moving contact is a plate, and two ends of the moving contact are respectively provided with a first contact part of the moving contact and a second contact part of the moving contact.

Optionally, the first polarity of the first permanent magnet faces towards one side of the arc striking part of the first static contact, which faces away from the first arc extinguishing chamber, and the second polarity of the first permanent magnet faces towards the bottom of the first magnetizer.

Optionally, the first magnetizer includes a first side wall and a second side wall that are parallel to each other, and two ends of the first permanent magnet are respectively connected with the first side wall and the second side wall.

Optionally, a first toothed extension part is arranged on the side wall of the first side wall facing the contact part of the moving contact and the first fixed contact in the closing motion area, and one or more first toothed extension parts are arranged; and a second toothed extension part is arranged on the side wall of the second side wall facing to the closing movement area of the contact part of the moving contact and the first fixed contact, and one or more second toothed extension parts are arranged.

Optionally, the first insulating arc-isolating cover includes a first insulating arc-isolating wall and a second insulating arc-isolating wall, which cover the inner side of the first side wall and the inner side of the second side wall of the first magnetizer arc structure respectively.

Optionally, the first explosion chamber has a plurality of first metal bars piece of mutual interval, the both ends of first metal bars piece are respectively perpendicular fixedly connected with two first fixed splint.

The application method of the multi-grid switch unit comprises the following steps:

when the switch is closed, the moving contact rotates clockwise, and two ends of the moving contact are respectively communicated with the first fixed contact component and the second fixed contact component;

when the brake is opened, the movable contact rotates anticlockwise, the movable contact is separated from the first fixed contact component and the second fixed contact component, the first magnetic system component and the second magnetic system component provide nonpolar magnetic field force to drive an arc generated between the movable contact and the first fixed contact component and the second fixed contact component to move towards the first arc-extinguishing chamber and the second arc-extinguishing chamber.

A rotary switch has a plurality of the multi-grid switch units which are arranged in a stacked manner.

Compared with the prior art, the invention has the following beneficial effects:

the invention utilizes the design of the static contact arc striking part and the multi-grid arc extinguishing chamber, increases the space of the arc extinguishing chamber and the number of metal grids as much as possible under the limited volume of the switch unit, simultaneously solves the problems that the arc is lengthened and enters the arc extinguishing grid as much as possible, utilizes the structure of the arc magnetizer with the tooth-shaped extension structure, the permanent magnet and the static contact arc striking part to cooperate, generates electromagnetic force for driving the arc to move towards the arc extinguishing chamber, is irrelevant to the direction of the arc current, realizes the remarkable improvement of the arc voltage by the cooling and cutting action of the metal grids on the arc, improves the voltage level of the breaking arc of the switch unit on the premise of unchanged volume and size of the switch unit, and promotes the improvement of the comprehensive performance, the reduction of the structure and the cost reduction of the rotary switch.

According to the invention, the arc magnetizers and the permanent magnets are arranged at the two sides of the moving interval of the moving contact and the fixed contact, so that the nonpolar magnetic force drive is realized for the moving contact and the fixed contact, the arc voltage can be obviously improved, and the product performance is improved.

Further, the insulating arc wall in the magnetic system component of the invention can generate gas which is beneficial to cooling the temperature of the arc under the high temperature effect of the arc, and the gas can also help to drive the arc into the arc extinguishing chamber, so that the voltage of the arc is raised more quickly, and the arc is extinguished effectively.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. In the drawings:

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is an exploded view of an embodiment of the present invention;

FIG. 3 is an internal schematic diagram of an embodiment of the present invention;

FIG. 4 is a schematic view of the position of a stationary contact according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a first magnetic system component of an embodiment of the present invention;

FIG. 6 is a schematic diagram of a third magnetizer according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a second magnetic system component of an embodiment of the present invention;

FIG. 8 is a schematic view of a moving contact holder according to an embodiment of the present invention;

1, a shell;

2. a first stationary contact assembly; 21. a first stationary contact portion; 22. an arc striking part of the first fixed contact; 23. a first stationary contact connecting portion;

3. a second stationary contact assembly; 31. a second stationary contact portion; 32. a second static contact arc striking part; 33. a second stationary contact connecting part;

4. a moving contact; 41. a first contact part of the moving contact; 42. a second contact portion of the movable contact; 5. a moving contact support;

6. a first arc extinguishing chamber; 61. A first metal grid sheet; 62. A first fixed splint;

7. a second arc extinguishing chamber; 71. A second metal grid sheet; 72. A second fixed splint;

8. a first magnetic system component; 81. a first permanent magnet; 82. a first magnetizer; 821. a first sidewall; 8211. a first toothed extension; 822. a second sidewall; 8221. a second toothed extension; 83. a first insulating arc-isolating cover; 831. a first insulating arc partition wall; 832. a second insulating arc partition wall;

9. a second magnetic system component; 91. a second permanent magnet; 92. a second magnetizer; 921. a third sidewall; 922. a fourth sidewall; 93. a second insulating arc-isolating cover; 9211. a third toothed extension; 9221. a fourth toothed extension; 931. a third insulating arc partition wall; 932. a fourth insulating arc partition wall;

10. a third magnetizer; 11. and a fourth magnetizer.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the multi-grid switch unit of the present invention includes a housing 1, a first fixed contact assembly 2, a second fixed 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 magnetizer 10 and a fourth magnetizer.

As shown in fig. 3 and fig. 4, the first stationary contact assembly 2 and the second stationary contact assembly 3 are both disposed on the bottom plate of the housing 1, the housing 1 is a rectangular housing, and the first stationary contact assembly 2 and the second stationary contact assembly 3 are disposed at two diagonal positions of the housing 1 respectively.

The first fixed contact assembly 2 comprises a first fixed contact part 21, a first fixed contact arc striking part 22 and a first fixed contact connecting part 23; one end of the first static contact arc striking part 22 is connected with the first static contact part 21, and the other end is connected with the first static contact connecting part 23. The other end of the first fixed contact connecting part 23 is vertically connected with 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 contacting portion 21. The first fixed contact portion 21, the first fixed contact arc striking portion 22 and the first fixed contact connecting portion 23 are all plate members and are all horizontally arranged.

The second fixed contact assembly 3 comprises a second fixed contact part 31, a second fixed contact arc striking part 32 and a second fixed contact connecting part 33; one end of the second static contact arc striking part 32 is connected with the second static contact part 31, and the other end is connected with the second static contact connecting part 33. The other end of the second fixed contact connecting portion 33 is vertically connected to the inner wall of the housing 1. The second fixed contact assembly 3 has the same structure as the first fixed contact assembly 2.

The two ends of the moving contact 4 are provided with a moving contact first contact part 41 and a moving contact second contact part 42. The first contact portion 41 of the moving contact and the second contact portion 42 of the moving contact are connected by a connecting piece, the connecting piece is a plate or a rod, and the center of the connecting piece is fixed at the center of the moving contact bracket 5.

The movable contact support 5 is rotatably connected to the center of the housing 1, and the movable contact support 5 can perform rotational movement relative to the housing 1.

As shown in fig. 8, the moving contact 4 is mounted inside the moving contact holder 5, and the moving contact 4 performs a contact and separation operation of the moving contact first contact portion 41 and the first fixed contact portion 21, and a contact and separation operation of the moving contact second contact portion 42 and the second fixed contact portion 31 by a rotational movement.

The first arc extinguishing chamber 6 and the second arc extinguishing chamber 7 are symmetrically arranged in the shell 1.

The first arc-extinguishing chamber 6 is arranged in a sector-shaped extension area formed by the first contact part 41 of the moving contact and the first contact part 21 of the first fixed contact during the rotation movement of the moving contact 4, the first arc-extinguishing chamber 6 is provided with a plurality of first metal grid sheets 61 which are mutually spaced, and two ends of each first metal grid sheet 61 are respectively and vertically fixedly connected with two first fixed clamping plates 62. The first metal grid 61 is disposed along an extension area of the opening and closing movement area of the moving contact first contact portion 41 and the first fixed contact portion 21.

The second arc extinguishing chamber 7 is arranged in a sector extension area formed by the second contact part 42 of the moving contact and the second contact part 31 of the second fixed contact during the rotation movement of the moving contact 4; the first arc extinguishing chamber 6 and the second arc extinguishing chamber 7 have the same structure; the second arc extinguishing chamber 7 is provided with a plurality of second metal grid plates 71 which are mutually spaced, and two second fixing clamping plates 72 are respectively and vertically fixedly connected with two ends of the second metal grid plates 71. The second metal gate 71 is disposed along an extension area of the opening/closing movement area of the second contact portion 42 of the moving contact and the second contact portion 31 of the second fixed contact.

As shown in fig. 5 and 6, the first magnetic system assembly 8 and the second magnetic system assembly 9 are symmetrically disposed in the housing 1, and the first magnetic system assembly 8 includes a first permanent magnet 81, a first magnetizer 82, and a first insulating arc-isolating cover 83.

The first polar surface of the first permanent magnet 81 faces to the side of the first static contact striking part 22 facing away from the first arc extinguishing chamber 6. The second polar surface of the first permanent magnet 81 faces the bottom of the first magnetizer 82 and is fixedly connected with the third magnetizer 10 in contact. The other end of the third magnetizer 10 is contacted with the first static contact arc striking part 22, and the third magnetizer 10 is parallel to the grid plate of the first arc extinguishing chamber 6.

The first magnetizer 82 has an arc structure, and the first permanent magnet 81 is disposed inside the arc structure of the first magnetizer 82. The first magnetizer 82 includes a first side wall 821 and a second side wall 822 with the same structure and size, and the first side wall 821 and the second side wall 822 are both arc shapes extending along an arc track 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 disposed between the opening and closing movement region of the moving contact first contact portion 41 and the first fixed contact portion 21 and the first metal grid 61.

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

The first side wall 821 has a first toothed extension portion 8211 facing the opening and closing movement region of the moving contact first contact portion 41 and the first fixed contact portion 21, and one or more first toothed extension portions 8211 are provided; the second side wall 822 has a second toothed extension 8221 facing the opening and closing movement region of the moving contact first contact portion 41 and the first fixed contact portion 21, and the number of the second toothed extension 8221 is one or more.

The first and second toothed extending portions 8211 and 8221 extend on two sides of the opening and closing movement region of the first contact portion 41 of the moving contact, so that an arc generated between the first contact portion 41 of the moving contact and the first fixed contact portion 21 is located between the first and second toothed extending portions 8211 and 8221.

The first insulating arc-isolating cover 83 includes 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 structure of the first magnetic conductor 82, so as to insulate the arcing region of the first arc extinguishing chamber 6 from the first magnetic conductor 82.

As shown in fig. 7, the second magnetic system assembly 9 includes a second permanent magnet 91, a second magnetizer 92, and a second insulating arc isolation cover 93, where a first polarity surface of the second permanent magnet 91 faces toward a side of the second fixed contact arc striking portion 32 opposite to the second arc extinguishing chamber 7, the second magnetizer 92 is an arc structure, the second permanent magnet 91 is disposed inside the arc structure of the second magnetizer 92, a second polarity surface of the second permanent magnet 91 faces toward a bottom of the arc structure of the second magnetizer 92, and the structures of the second permanent magnet 91, the third side wall 921 and the fourth side wall 921 are the same in size, the third side wall 921 is an arc extending along an arc track of the opening and closing motion of the second contact portion 42, and the fourth side wall 921 is an arc extending along an arc track of the opening and closing motion of the second contact portion 42.

The third side wall 921 has third tooth-shaped extension parts 9211 facing the opening and closing movement region of the moving contact second contact part 42 and the second fixed contact connecting part 33, and one or more third tooth-shaped extension parts 9211; the fourth side wall 922 has a fourth tooth-shaped extension portion 9221 facing the opening/closing movement region of the moving contact second contact portion 42 and the second fixed contact connecting portion 33, and the number of the fourth tooth-shaped extension portions 9221 is one or more.

The third side wall 921 of the second magnetizer 92 has a third tooth-shaped extension portion 9211 and a fourth tooth-shaped extension portion 9221 of the fourth side wall 922 that extend on both sides of the opening and closing movement area of the second contact portion 42 of the moving contact, so that an arc generated between the second contact portion 42 of the moving contact and the second fixed contact connecting portion 33 is located between the third tooth-shaped extension portion 9211 and the fourth tooth-shaped extension portion 9221.

The third side wall 921 and the fourth side wall 922 are disposed between the opening and closing movement area of the second contact portion 42 and the second fixed contact portion 31 of the moving contact and the second metal gate 71 of the second arc extinguishing chamber 7.

The second insulating arc-isolating cover 93 has a third insulating arc-isolating wall 931 and a fourth insulating arc-isolating wall 932, which 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, respectively, to insulate the arcing region of the second arc extinguishing chamber 7 from the second magnetic conductor 92.

One end of the fourth magnetizer 11 is contacted with the second static contact arc striking part 32, and the other end is parallel to the grid plate of the second arc extinguishing chamber 7 which is adjacent to the fourth magnetizer.

The invention relates to a multi-grid switch unit, which is characterized in that when in use:

when the switch-on is performed, the moving contact 4 rotates clockwise for 90 degrees, and two ends of the moving contact 4 are respectively communicated with the first fixed contact part 21 and the second fixed contact part 31.

When the switch-off is carried out, the moving contact 4 rotates anticlockwise, the moving contact 4 is separated from the first fixed contact component 2 and the second fixed contact component 3, in the separation process, the first magnetic system component 8 and the second magnetic system component 9 can provide nonpolar magnetic field force to drive an electric arc generated between the moving contact 4 and the first fixed contact component 2 and the second fixed contact component 3 to move towards the first arc-extinguishing chamber 6 and the second arc-extinguishing chamber 7, and on the other hand, the first insulating arc-isolating cover 83 and the second insulating arc-isolating cover 93 in the first magnetic system component 8 and the second magnetic system component 9 can also generate gas which is favorable for cooling the temperature of the electric arc under the high temperature effect of the electric arc, and the gas is also favorable for driving the electric arc to enter the first arc-extinguishing chamber 6 and the second arc-extinguishing chamber 7, so that the electric arc voltage is improved more rapidly, and the electric arc is extinguished effectively.

The device elements in the above embodiments are conventional device elements unless otherwise specified, and the structural arrangement, operation or control modes in the embodiments are conventional arrangement, operation or control modes in the art unless otherwise specified.

Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. A multi-gate switching unit, comprising:

a housing (1), the housing (1) comprising a bottom plate;

the movable contact support (5) is arranged on the bottom plate of the shell (1);

the movable contact (4) is rotatably arranged in the movable contact bracket (5);

the first arc-extinguishing chamber (6), 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);

the first fixed contact assembly (2), the first fixed contact assembly (2) is arranged outside the movable contact support (5), and the second fixed contact assembly (3) is arranged on the opposite side of the center of the movable contact support (5) along the first fixed contact assembly (2);

the first fixed contact assembly (2) comprises a first fixed contact arc striking part (22), one end of the first fixed contact arc striking part (22) is connected with a first fixed contact part (21), the other end of the first fixed contact arc striking part is connected with a first fixed contact connecting part (23), and the first fixed contact part (21) faces the moving contact (4); the structure of the second static contact assembly (3) is the same as that of the first static contact assembly (2); a first magnetic system component (8) is arranged on the inner side of the first arc extinguishing chamber (6), and a second magnetic system component (9) is arranged on the inner side of the second arc extinguishing chamber (7); the inner sides of the first arc-extinguishing chamber (6) and the second arc-extinguishing chamber (7) are arc-shaped; the first magnetic system component (8) comprises a first magnetizer (82), a first insulating arc isolation cover (83) is arranged on the inner side of the first magnetizer (82), the first magnetizer (82) is arc-shaped, a first permanent magnet (81) is arranged in the first magnetizer (82), a third magnetizer (10) is fixedly connected with the first permanent magnet (81), and the other end of the third magnetizer (10) is in contact with the first static contact arc striking part (22); the second magnetic system component (9) has the same structure as the first magnetic system component (8), and a fourth magnetizer (11) is arranged in the second magnetic system component (9).

2. A multi-gate switch unit according to claim 1, wherein the moving contact support (5) is disc-shaped, a rotation axis is provided in the moving contact support (5), and the moving contact (4) is connected to the rotation axis of the moving contact support (5).

3. A multi-gate switch unit according to claim 1, wherein the moving contact (4) is a plate, and both ends of the moving contact (4) are respectively provided with a moving contact first contact portion (41) and a moving contact second contact portion (42).

4. A multi-gate switching unit according to claim 1, characterized in that the first polar face of the first permanent magnet (81) faces the side of the first stationary contact striking part (22) facing away from the first arc extinguishing chamber (6), and the second polar face of the first permanent magnet (81) faces the bottom of the first magnetizer (82).

5. A multi-gate switch unit according to claim 1, wherein the first magnetizer (82) comprises a first side wall (821) and a second side wall (822) which are parallel to each other, and both ends of the first permanent magnet (81) are connected to the first side wall (821) and the second side wall (822), respectively.

6. The multi-gate switch unit according to claim 5, wherein a first tooth-like extension (8211) is provided on a side wall of the first side wall (821) facing the opening and closing movement region of the moving contact (4) and the first fixed contact portion (21), and the first tooth-like extension (8211) is one or more; the second side wall (822) is provided with a second toothed extension part (8221) on the side wall facing the opening and closing movement area of the moving contact (4) and the first fixed contact part (21), and one or more second toothed extension parts (8221) are arranged.

7. A multi-gate switch unit according to claim 5, wherein the first insulating arc shield (83) comprises a first insulating arc partition wall (831) and a second insulating arc partition wall (832) respectively covering the inner side of the first side wall (821) and the inner side of the second side wall (822) of the arc structure of the first magnetizer (82).

8. A multi-gate switching unit according to claim 1, wherein the first arc extinguishing chamber (6) has a plurality of first metal gate plates (61) spaced apart from each other, and two first fixing clamping plates (62) are vertically and fixedly connected to two ends of the first metal gate plates (61), respectively.

9. The method of using a multi-gate switching unit according to claims 1 to 8, comprising the steps of:

when in closing, the moving contact (4) rotates clockwise, and two ends of the moving contact (4) are respectively communicated with the first fixed contact component (2) and the second fixed contact component (3);

when the switch is opened, the movable contact (4) rotates anticlockwise, the movable contact (4) is separated from the first fixed contact component (2) and the second fixed contact component (3), the first magnetic system component (8) and the second magnetic system component (9) provide nonpolar magnetic field force, and electric arcs generated between the movable contact (4) and the first fixed contact component (2) and the second fixed contact component (3) are driven to move towards the first arc extinguishing chamber (6) and the second arc extinguishing chamber (7).

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