Switch unit

Abstract

The utility model relates to the field of low-voltage electric appliances, in particular to a switch unit. Two groups of moving contact parts of a moving contact mechanism are respectively matched with static contact parts of a static contact in a one-to-one manner to form two groups of contact pairs; the two groups of arc extinguish chambers are respectively arranged at two radial sides of the moving contact mechanism and are respectively matched with the two groups of contact pairs; each arc extinguish chamber comprises a plurality of arc extinguish grid sheets which are sequentially arranged side by side at intervals along the moving direction of the moving contact part; at least a part of arc extinguishing grid plates of the arc extinguishing chamber are used as inner grid plates, a part of the arc extinguishing grid plates of the arc extinguishing chamber are used as outer grid plates, at least one outer grid plate is arranged between adjacent inner grid plates, and the outer grid plates deviate in the direction away from the motion trail of the movable contact part relative to the inner grid plates; the two groups of static contacts are of a central symmetry structure with the rotating axis of the moving contact mechanism as the central symmetry axis. The switch unit is good in arc extinguishing performance and simple in structure.

Description

Technical Field

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

[0002] Existing rotary disconnectors consist of an operating mechanism and a switch unit. The switch unit comprises multiple stacked switch units, each of which includes a rotating movable contact mechanism and a stationary contact. The movable contact mechanism is driven by the operating mechanism to close and open with the stationary contact. Each switch unit also has an arc extinguishing chamber, which is used to extinguish the arc generated by the opening and closing of the movable and stationary contacts. The limited number of arc extinguishing grids within the arc extinguishing chamber limits the efficiency of arc segmentation and extinguishing. Furthermore, the arc generated by the movable and stationary contacts is easily scattered and cannot quickly and efficiently enter the arc extinguishing chamber. Utility Model Content

[0003] The purpose of the present invention is to overcome at least one defect of the prior art and to provide a switch unit with good arc extinguishing performance and simple structure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A switch unit comprising a housing, and a contact system and an arc extinguishing chamber, both disposed within the housing; the contact system comprising a movable contact mechanism and two sets of stationary contacts for use together; the movable contact mechanism comprising two sets of movable contact portions, the movable contact portions cooperating one-to-one with the stationary contact portions of the stationary contacts to form contact pairs that cooperate one-to-one with the arc extinguishing chambers; the two sets of arc extinguishing chambers being disposed on radially opposite sides of the movable contact mechanism and cooperating with the two sets of contact pairs, respectively; the arc extinguishing chambers comprising a plurality of arc extinguishing grids sequentially arranged side by side and spaced apart along the direction of movement of the movable contact portions;

[0006] At least part of the arc-extinguishing grids of the arc-extinguishing chamber serves as inner grids and the other part as outer grids, at least one outer grid is provided between adjacent inner grids, and the outer grids are offset relative to the inner grids in a direction away from the motion trajectory of the moving contact portion; the two groups of static contacts are centrally symmetrical structures with the rotation axis of the moving contact mechanism as the central symmetry axis.

[0007] Furthermore, the inner grid plates and the outer grid plates are arranged alternately in sequence.

[0008] Furthermore, of all the arc-extinguishing grids in the arc-extinguishing chamber, part is used as inner grids and the other part is used as outer grids.

[0009] Furthermore, the moving contact mechanism is rotatably arranged.

[0010] Furthermore, the static contact includes a static contact part, a static contact connecting part and a terminal connected in sequence, the static contact part, the static contact connecting part and the terminal are all plate-like structures, the static contact part and the static contact connecting part are coplanar, and the plane where the static contact connecting part is located is perpendicular to the plane where the terminal is located.

[0011] Furthermore, the arc extinguishing chamber is a fan-shaped structure, one end of which is arranged adjacent to the static contact portion of the corresponding static contact and the other end extends to the position of the dynamic contact portion when the moving contact mechanism moves to the disconnected position, and the arc extinguishing grids are arranged radially around the moving contact mechanism.

[0012] Furthermore, in the arc extinguishing chamber, the angle between adjacent arc extinguishing grids is α, and 0°≤α≤5°.

[0013] Furthermore, in the arc extinguishing chamber, the minimum distance between adjacent arc extinguishing grids is L1, 0.6 mm ≤ L1 ≤ 1.0 mm.

[0014] Furthermore, the arc extinguishing chamber also includes two arc extinguishing chute plates arranged relatively at intervals, and each arc extinguishing grid is arranged between the two arc extinguishing chute plates and is fixedly connected to the two arc extinguishing chute plates; the arc extinguishing chute is a fan-shaped plate, which includes an inner edge and an outer edge of an arc that are arranged relatively, the inner edge and the outer edge are concentric and the radius of the inner edge is smaller than the radius of the outer edge, the inner edge is arranged close to the arc inlet of the arc extinguishing chamber, and the outer edge is arranged close to the exhaust port of the arc extinguishing chamber.

[0015] Furthermore, the switch unit also includes an arc isolation device, which includes an upper arc isolation device and a lower arc isolation device. The upper arc isolation device includes an upper arc isolation wall, and the lower arc isolation device includes a lower arc isolation wall. The upper arc isolation wall and the lower arc isolation wall are relatively spaced apart along the rotation axis of the moving contact mechanism to form two groups of contact gaps. The contact gaps are respectively matched one-to-one with the contact pairs and the arc extinguishing chambers. One end of the contact gap is connected to the arc entrance of the corresponding arc extinguishing chamber. The moving contact part moves in the corresponding contact gap to close and disconnect with the corresponding static contact part.

[0016] Furthermore, in the rotational axis direction of the moving contact mechanism, the width of the contact gap is smaller than the height of the gap between adjacent arc-extinguishing grids.

[0017] Furthermore, the upper arc isolation device also includes an upper magnetic conductive plate arranged on the upper arc isolation wall, and the lower arc isolation device also includes a lower magnetic conductive plate arranged on the lower arc isolation wall. The upper magnetic conductive plate and the lower magnetic conductive plate are arranged relatively spaced apart along the rotation axis of the moving contact mechanism, and are respectively located on both sides of the upper arc isolation wall and the lower arc isolation wall to surround the motion trajectory of the corresponding moving contact part from both sides.

[0018] Furthermore, the upper magnetic conductive plate and the lower magnetic conductive plate are both fan-shaped plates.

[0019] The switch unit of the present invention, the arrangement of the inner grid and the outer grid of the arc extinguishing chamber can bring the following benefits: First, it is conducive to reducing the resistance of the arc entering the arc extinguishing chamber, improving the efficiency of the arc entering the arc extinguishing chamber, and thus improving the arc extinguishing efficiency; Second, it can allow the arc extinguishing chamber to be loaded with a larger number of arc extinguishing grids without increasing or significantly increasing the resistance of the arc entering the arc extinguishing chamber, thereby further improving the arc extinguishing performance of the arc extinguishing chamber; the two groups of static contacts are centrally symmetrical structures with the rotation axis of the moving contact mechanism as the central symmetry axis, which is conducive to reducing the number of components of the switch unit and simplifying the structure of the switch unit.

[0020] In addition, the contact gap formed by the arc isolation device prevents the arc generated by the opening and closing of the contact pair from overflowing, ensuring that all or most of the arc enters the arc extinguishing chamber and is extinguished. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a projection view of the universal switch unit of the utility model;

[0022] Figure 2 This is an exploded view of the universal switch unit of the utility model;

[0023] Figure 3 This is a projection view of the housing of the universal switch unit of the present utility model;

[0024] Figure 4 This is a schematic structural diagram of the contact system of the universal switch unit of the present utility model;

[0025] Figure 5 This is a projection view of the universal switch unit of the present invention, showing the arrangement of the arc extinguishing grids of the arc extinguishing chamber;

[0026] Figure 6 It is a three-dimensional structural diagram of the universal switch unit of the utility model, showing the arrangement of the arc extinguishing grids of the arc extinguishing chamber.

[0027] Description of Reference Numerals

[0028] Front partition plate 1-11f, rear partition plate 1-11b;

[0029] Shell shaft hole 1-12;

[0030] Left arc extinguishing area 1-13l, right arc extinguishing area 1-13r;

[0031] Left air outlet 1-14l, right air outlet 1-14r;

[0032] Left internal airway 1-15l, right internal airway 1-51r;

[0033] Left air guide structure 1-16l, first left guide plate 1-161l, second left guide plate 1-162l, third left guide plate 1-163l, first left auxiliary plate 1-164l, second left auxiliary plate 1-165l, right air guide structure 1-16r, first right guide plate 1-160r, second right guide plate 1-161r, third right guide plate 1-162r, fourth right auxiliary plate 1-168r; fifth right auxiliary plate 1-169r;

[0034] Front contact position 1-17f, rear contact position 1-17b;

[0035] Front divider 1-18f, rear divider 1-18b;

[0036] Left side wall 1-19l, right side wall 1-19r, front side wall 1-19f, back side wall 1-19b;

[0037] Left combing column 1-20l, right combing column 1-20r;

[0038] Left arc extinguishing chamber 21; right arc extinguishing chamber 2r; arc extinguishing chute 2-1, arc extinguishing grid 2-2, inner grid 2-21, outer grid 2-22;

[0039] Contact system c;

[0040] Moving contact mechanism 3;

[0041] Front static contact 4f; rear static contact 4b;

[0042] Arc isolation device 5, upper arc isolation device 5h, upper arc isolation wall 5-0h, upper magnetic conductive plate 5-1h, lower arc isolation device 5d, lower arc isolation plate 5-0d, lower magnetic conductive plate 5-1d; DETAILED DESCRIPTION

[0043] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the switch electrical apparatus of the present invention. The switch electrical apparatus of the present invention is not limited to the description of the following embodiments.

[0044] The present invention discloses a switch electrical appliance, which is preferably an isolating switch, specifically a rotary isolating switch. The following is an embodiment of the switch electrical appliance of the present invention.

[0045] like Figure 1-2As shown, the switchgear of the present invention includes an operating mechanism (not shown) and a switch portion. The switch portion includes at least one switch unit. The switch unit includes a housing and a contact system c and an arc extinguishing chamber, each of which is disposed within the housing. The contact system c includes a contact pair that cooperates with the arc extinguishing chamber. The contact pair includes a static contact portion and a moving contact portion. The arc extinguishing chamber is used to extinguish the arc generated by the closing and opening of the corresponding moving contact portion and the static contact portion (that is, the closing and opening of the contact system c). The operating mechanism drives each moving contact portion to move and close and open with the static contact portion. One end of the arc extinguishing chamber that cooperates with the contact pair serves as the arc inlet of the arc extinguishing chamber, and the other end serves as the exhaust port of the arc extinguishing chamber. Furthermore, the contact system c includes a moving contact mechanism 3 and a static contact that cooperate. The moving contact mechanism 3 includes a moving contact portion, and the static contact includes a static contact portion. The operating mechanism is transmission-connected to the moving contact mechanism 3 of each switch unit, driving each moving contact mechanism 3 to move and close and open with the corresponding static contact (that is, the moving contact portion and the static contact portion close and open). Furthermore, in the switch unit, the moving contact mechanism 3 is rotatably arranged; the operating mechanism and the switch part are stacked along the rotation axis direction of the moving contact mechanism 3 (recorded as the first direction); the switch part preferably includes two or more switch units, and each switch unit is stacked along the first direction.

[0046] Specifically, such as Figure 1-2As shown, the switch unit includes two sets of arc extinguishing chambers, the contact system c includes two sets of static contacts, and the moving contact mechanism 3 includes a moving contact. The moving contact includes two sets of moving contact portions. The two sets of moving contact portions are preferably arranged at the radial ends of the moving contact mechanism 3. Each set of static contacts includes a static contact portion. The two sets of moving contact portions cooperate with the two sets of static contact portions to form two contact pairs. The two sets of arc extinguishing chambers are respectively arranged on the radial sides of the moving contact mechanism 3 and are used in conjunction with the two sets of contact pairs. Each arc extinguishing chamber is used to extinguish the arc generated by the opening and closing of the corresponding contact pair. In the switch unit, the two sets of static contacts are respectively the front static contact 4f and the rear static contact 4d, and the two sets of arc extinguishing chambers are respectively the left arc extinguishing chamber 2l and the right arc extinguishing chamber 2r. The left arc extinguishing chamber 2l, the rear static contact 4d, the right arc extinguishing chamber 2r, and the front static contact 4f are arranged in sequence around the moving contact mechanism 3. The arc extinguishing chamber includes two arc extinguishing chute plates 2-1 spaced apart from each other and a plurality of arc extinguishing grids 2-2 spaced apart and arranged side by side in a second direction (the second direction is also the direction of movement of the moving contact portion / the extension direction of the moving contact portion's movement trajectory / the rotation direction of the moving contact mechanism 3). Each arc extinguishing grid 2-2 is disposed between the two arc extinguishing chute plates 2-1 and is fixedly connected to the arc extinguishing chute plates 2-1. In the second direction, the two ends of the arc extinguishing chamber are the front end of the arc extinguishing chamber (i.e., the end of the arc extinguishing chamber that cooperates with the corresponding static contact) and the rear end of the arc extinguishing chamber (i.e., the end of the arc extinguishing chamber that cooperates with the moving contact portion that moves to the disconnected position). The moving contact mechanism 3 includes a contact support and a moving contact. The contact support includes a support body into which the moving contact is inserted. The moving contact mechanism 3 is rotatably arranged by the contact support. A moving contact portion is provided at each end of the moving contact. The housing includes a housing shaft hole 1-12 disposed on the bottom wall of the housing for the contact support to rotate therein. The arc extinguishing chamber is a fan-shaped structure in the projection perpendicular to the first direction, and the two arc extinguishing chute plates 2-1 of the arc extinguishing chamber are preferably both fan-shaped structures and symmetrically arranged.

[0047] As another embodiment of the arc extinguishing chamber, the arc extinguishing chamber is not provided with the arc chute 2 - 1 , and each arc extinguishing grid 2 - 2 is fixedly provided on the grid fixing structure of the housing.

[0048] like Figure 1 、 3 As shown, the housing further includes two sets of partitions, one set radially opposite the housing shaft hole 1-12 and the other set radially opposite the movable contact mechanism 3. The two sets of partitions cooperate with the movable contact mechanism 3 (specifically, the contact supports of the movable contact mechanism 3) to divide the interior space of the housing into two subspaces. Specifically, the two partitions are a front partition 1-18f and a rear partition 1-18b.

[0049] like Figure 1 、 3As shown, the shell also includes a shell arc extinguishing structure that matches the arc extinguishing chamber one-to-one, the shell arc extinguishing structure includes an arc extinguishing area, an inner air duct, an air guide structure and an air outlet, the inner air duct, the air guide structure and the arc extinguishing area are all arranged in the shell, the arc extinguishing area is used to accommodate the arc extinguishing chamber (that is, the arc extinguishing chamber is arranged in the arc extinguishing area), the air guide structure is used to match with the exhaust port of the arc extinguishing chamber (that is, the air guide structure is relatively matched with the exhaust port of the arc extinguishing chamber), an inner air duct is formed between the air guide structure and the side wall of the shell, the air outlet is arranged on the side wall of the shell and is used to connect the inner air duct with the external environment (that is, the external environment where the switch unit is located); the air guide structure includes at least two guide plates, each guide plate moves along the direction of movement of the corresponding dynamic contact part ( Figure 1 The double-arrow arc line in the middle represents the movement direction of the dynamic contact part) is arranged in sequence, one side of each guide plate faces the side wall of the shell and the other side is used to face the exhaust port of the arc extinguishing chamber arranged in the arc extinguishing area, and air ducts are provided between adjacent guide plates. An air duct is provided between the end of the guide plate close to the contact position adjacent to the contact position and the side wall of the shell, and an air duct is provided at the end of the guide plate close to the disconnection position adjacent to the disconnection position. The air duct is used to connect the internal air duct and the exhaust port of the arc extinguishing chamber, and the gas in the arc extinguishing chamber is discharged into the external environment through the air duct, the internal air duct and the air outlet.

[0050] The gas guide structure, internal gas duct and gas outlet can bring the following benefits: 1. The guide plates of the gas guide structure can extend the retention time of the arc in the arc extinguishing chamber, so that the arc can be extinguished more fully; 2. The gas discharged from the arc extinguishing chamber enters the spacious internal gas duct through the narrow gas duct, so that the gas undergoes a process of compression and expansion, which is conducive to further extinguishing the arc escaping from the arc extinguishing chamber; 3. The guide plates of the gas guide structure have a combing effect on the gas discharged from the arc extinguishing chamber, eliminating or improving the disordered flow of the gas discharged from the arc extinguishing chamber, and allowing the gas to be discharged from the shell more smoothly.

[0051] Furthermore, the housing also includes a contact position for accommodating the static contact part and a disconnection position for accommodating the dynamic contact part that moves to the disconnection position. The contact position is matched one-to-one with the static contact part, and the disconnection position is matched one-to-one with the dynamic contact part. That is, the static contact part is arranged in the corresponding contact position, and the dynamic contact part is located in the disconnection position when it moves to the disconnection position. The contact position and the disconnection position are respectively arranged in correspondence with the two ends of the arc extinguishing area. In other words, the contact position and the disconnection position are respectively arranged in correspondence with the two ends of the arc extinguishing chamber in the arc extinguishing area; the guide plates of the air guide structure are sequentially arranged on one side of the corresponding arc extinguishing area along the direction from the corresponding contact position to the disconnection position. Furthermore, the contact position is arranged outside one end of the corresponding arc extinguishing area, and the disconnection position is arranged at the other end of the corresponding arc extinguishing area.

[0052] Furthermore, the number of guide plates of the air guide structure is m, where m is an integer and is ≥3.

[0053] Further, such as Figure 1As shown, the guide plates of the gas guide structure are also used to cooperate with the side edges of the arc chute 2-1 of the corresponding arc extinguishing chamber to limit the arc extinguishing chamber in the working position. Furthermore, each guide plate is spaced apart from the end of the corresponding arc extinguishing grid 2-2 located within the exhaust port of the arc extinguishing chamber.

[0054] Furthermore, as shown in Figures 1 and 3, the air outlet is disposed between the corresponding contact position and the disconnect position, with the air outlet being disposed closer to the contact position relative to the disconnect position, or closer to the disconnect position relative to the contact position. Furthermore, the air outlet is oriented perpendicular to the sidewall where the air outlet is located. The orientation of the air outlet can be adjusted based on actual needs and is not limited to being perpendicular to the sidewall where the air outlet is located.

[0055] Specifically, in the switch unit, the housing includes two sets of arc-extinguishing structures disposed radially on opposite sides of the housing's housing axis hole 1-12. The two sets of arc-extinguishing chambers are spaced apart and contained within two oppositely disposed arc-extinguishing regions. When mated with the two contact pairs of the contact system c, the arc inlets of the two sets of arc-extinguishing chambers are positioned opposite each other. One end of each arc-extinguishing chamber is positioned adjacent to the corresponding static contact, and the other end extends to the corresponding disconnected position. Furthermore, the two sets of arc-extinguishing chambers are located radially on opposite sides of the moving contact mechanism 3, and the two sets of housing arc-extinguishing structures are disposed radially on opposite sides of the moving contact mechanism 3. Furthermore, the shell arc extinguishing structure used to cooperate with the left arc extinguishing chamber 2l is the shell left arc extinguishing structure, and the arc extinguishing area, internal air duct, air guiding structure and air outlet of the shell left arc extinguishing structure are respectively the left arc extinguishing area 1-13l, the left internal air duct 1-15l, the left air guiding structure 1-16l and the left air outlet 1-14l; the shell arc extinguishing structure used to cooperate with the right arc extinguishing chamber 2r is the shell right arc extinguishing structure, and the arc extinguishing area, internal air duct, air guiding structure and air outlet of the shell right arc extinguishing structure are respectively the right arc extinguishing area 1-13r, the right internal air duct 1-15r, the right air guiding structure 1-16r and the right air outlet 1-14r. The contact position and disconnection position corresponding to the two ends of the left arc extinguishing area 1-13l are respectively the rear contact position 1-17b and the front disconnection position, and the rear contact position 1-17b is located in the left arc extinguishing area 1-13l The front disconnect position is arranged on the outside of one end of the left arc extinguishing area 1-13l, and the contact position and disconnect position corresponding to the right arc extinguishing area 1-13r are the front contact position 1-17f and the rear disconnect position respectively. The front contact position 1-17f is located on the outside of one end of the right arc extinguishing area 1-13r and the rear disconnect position is arranged on the other end of the right arc extinguishing area 1-13r. The rear contact position 1-17b, the rear disconnect position, the front contact position 1-17f and the front disconnect position are arranged in sequence around the moving contact mechanism 3. The rear contact position 1-17b and the rear disconnect position are arranged on one radial side of the moving contact mechanism 3 and the front contact position 1-17f and the front disconnect position are arranged on the other radial side of the moving contact mechanism 3. The rear contact position 1-17b is used to accommodate the static contact part of the rear static contact 4b, and the front contact position 1-17f is used to accommodate the static contact part of the front static contact 4f. Furthermore, the front contact position 1-17f is adjacent to the front partition 1-18f, the rear contact position 1-17b is adjacent to the rear partition 1-18f, and the contact position, partition, and arc extinguishing area are arranged in turn around the moving contact mechanism 3 / shell shaft hole 1-12, that is, the front contact position 1-17f, the front partition 1-18f, the left arc extinguishing area 1-13l, the rear contact position 1-17b, the rear partition 1-18b, and the right arc extinguishing area 1-13r are arranged in turn around the moving contact mechanism 3 / shell shaft hole 1-12.

[0056] Furthermore, the shell includes four shell side walls, which are respectively a left side wall 1-19l and a right side wall 1-19r arranged relatively at intervals, and a rear side wall 1-19b and a front side wall 1-19f arranged relatively at intervals. The left side wall 1-19l, the rear side wall 1-19b, the right side wall 1-19r, and the front side wall 1-19f are connected end to end in sequence and form four shell inner corners. The shell bottom wall is respectively connected to the left side wall 1-19l, the rear side wall 1-19b, the right side wall 1-19r, and the front side wall 1-19f; the rear contact position 1-17b and the rear disconnect position are located between the rear side wall 1-19b and the shell shaft hole 1-12, the front contact position 1-17f and the front disconnect position are located between the front side wall 1-19f and the shell shaft hole 1-12, and the left arc extinguishing chamber 2l, the shell shaft hole 1-12, and the right arc extinguishing chamber 2r are arranged in sequence on the left side wall 1-19l and Between the right side wall 1-19r, the left arc extinguishing chamber 2l, the moving contact mechanism 3, and the right arc extinguishing chamber 2r are arranged in sequence between the left side wall 1-19l and the right side wall 1-19r. In the second direction, the two ends of the arc extinguishing chamber (i.e., the front end of the arc extinguishing chamber and the rear end of the arc extinguishing chamber) are respectively arranged close to the front side wall 1-19f and the rear side wall 1-19b. Specifically, the front end of the arc extinguishing chamber and the rear end of the arc extinguishing chamber of the left arc extinguishing chamber 2l are respectively arranged close to the rear side wall 1-19b and the front side wall 1-19f, and the front end of the arc extinguishing chamber and the rear end of the arc extinguishing chamber of the left arc extinguishing chamber 2l are also respectively arranged close to the rear contact position 1-17b and the front partition 1-18f, and the front end of the arc extinguishing chamber and the rear end of the arc extinguishing chamber of the right arc extinguishing chamber 2r are respectively arranged close to the front side wall 1-19f and the rear side wall 1-19b, and the front end of the arc extinguishing chamber and the rear end of the arc extinguishing chamber of the right arc extinguishing chamber 2r are also respectively arranged close to the front contact position 1-17f and the rear partition 1-18b.

[0057] like Figure 1 、 3 As shown, the housing further includes a combing column disposed within the inner airway and corresponding one-to-one with the air outlet. The combing column is located on the inner end of the corresponding air outlet and is arranged opposite thereto. The airflow entering the arc extinguishing chamber through each airway has different flow rates. When the airflows return to the combing column within the inner airway, they interact with each other. Without affecting the airflow movement, the rate at which the airflow exits the housing is delayed, forming a certain pressure-maintaining space within the housing. This allows as many arc-extinguishing grids as possible to act on the arc cutting, thereby improving arc pressure and arc extinguishing efficiency.

[0058] Furthermore, the combing column is an n-prism, where n is an integer and ≥3. The airflow from the internal airway converging to the combing column will be broken up by the edges of the combing column, further curbing the rate at which the airflow is discharged from the shell through the air outlet, thereby extending the pressure holding time in the shell. Furthermore, n is an even number, and the line connecting the edge of the combing column opposite to the inner end of the corresponding air outlet and the opposite edge of the edge is parallel to the direction of the air outlet; for example: the combing column is a rhombus-shaped column, one of its edges is opposite to the inner end of the corresponding air outlet, and the line connecting the edge and the opposite edge is parallel to the direction of the air outlet; or, the combing column is a regular square prism; or, the combing column is a regular hexagonal column.

[0059] Furthermore, each corner of the combing column is rounded or chamfered.

[0060] As another embodiment of the carding cylinder, the carding cylinder is a cylinder.

[0061] Specifically, in the switch unit, a combing column is provided in each of the left inner air duct 1-15l and the right inner air duct 1-15r, namely a left combing column 1-20l and a right combing column 1-20r. The left combing column 1-20l is arranged opposite to the inner end of the left air outlet 1-14l, and the right combing column 1-20r is arranged opposite to the inner end of the right air outlet 1-14r. The left combing column 1-20l is located at the inner corner of the shell formed by the left side wall 1-19l and the rear side wall 1-19b, and the right combing column 1-20r is located at the inner corner of the shell formed by the right side wall 1-19r and the rear side wall 1-19b.

[0062] like Figure 5-6 As shown, the following is an embodiment of the arc extinguishing chamber.

[0063] like Figure 5-6As shown, among at least part of the arc-extinguishing grids 2-2 of the arc-extinguishing chamber, part of the arc-extinguishing grids 2-2 serve as inner grids 2-21, and another part of the arc-extinguishing grids 2-2 serve as outer grids 2-22. At least one outer grid 2-22 is provided between adjacent inner grids 2-21, and the outer grids 2-22 are offset relative to the inner grids 2-21 in a direction away from the motion trajectory of the moving contact portion (in other words, the inner grid 2-21 is closer to the motion trajectory of the moving contact portion relative to the outer grid 2-22), that is, the outer grid 2-22 is offset relative to the inner grid 2-21 toward the side where the exhaust port of the arc-extinguishing chamber is located. The arrangement of the inner grids 2-21 and outer grids 2-22 can bring the following benefits: 1. It is conducive to reducing the resistance of the arc entering the arc extinguishing chamber, improving the efficiency of the arc entering the arc extinguishing chamber, and thus improving the arc extinguishing efficiency; 2. It can allow the arc extinguishing chamber to be loaded with a larger number of arc extinguishing grids 2-2 without increasing or significantly increasing the resistance of the arc entering the arc extinguishing chamber, thereby further improving the arc extinguishing performance of the arc extinguishing chamber. Furthermore, the inner grids 2-21 and outer grids 2-22 are arranged alternately in sequence. Furthermore, among all the arc extinguishing grids 2-2 in the arc extinguishing chamber, some of the arc extinguishing grids 2-2 serve as inner grids 2-21 and other parts of the arc extinguishing grids 2-2 serve as outer grids 2-22.

[0064] Further, such as Figure 5-6 As shown, in the arc extinguishing chamber, the arc extinguishing grids 2-2 are radially arranged around the movable contact mechanism 3 / the housing shaft hole 1-12 / the first axis (i.e., the rotation axis of the movable contact mechanism 3 / the axis of the housing shaft hole 1-12). All the arc extinguishing grids 2-2 in the arc extinguishing chamber are in an arc-shaped structure.

[0065] As another embodiment of the arrangement of the arc-quenching grids 2-2 of the arc-quenching chamber, when the arc-quenching chamber is used in other types of switching devices (such as circuit breakers and contactors), the arc-quenching grids 2-2 are arranged in a straight line. Specifically, the inner grids 2-21 are positioned entirely along a straight path, and the outer grids 2-22 are positioned entirely along a straight path, with the two straight paths being parallel to each other. Accordingly, the gas guide structure can also be adaptively adjusted, that is, the guide plates are also arranged along a straight path and are positioned opposite the exhaust port of the arc-quenching chamber.

[0066] Furthermore, the angle between adjacent arc-extinguishing grids 2 - 2 of the arc-extinguishing chamber is α, 0°≤α≤5°, which ensures the compactness of the arc-extinguishing grid layout and effectively controls the space required for the arc-extinguishing chamber.

[0067] Furthermore, the minimum distance between adjacent arc-extinguishing grids of the arc-extinguishing chamber is L1, 0.6 mm ≤ L1 ≤ 1.0 mm, to ensure the compactness of the arc-extinguishing grid layout and to ensure that the arc smoothly enters between the arc-extinguishing grids.

[0068] Furthermore, the minimum distance between adjacent outer grids 2-22 of the arc extinguishing chamber is L3, 1.5mm≤L3≤2.5mm, to ensure the compactness of the arc extinguishing grid layout and to ensure that the arc smoothly enters between the arc extinguishing grids.

[0069] Furthermore, the exhaust port of the arc extinguishing chamber is an arc-shaped structure, and each guide plate of the gas guide structure is arranged around the corresponding arc extinguishing chamber, and each guide plate of the gas guide structure is also arranged around the corresponding arc extinguishing area for accommodating the arc extinguishing chamber. Specifically, the left guide plate of the left gas guide structure 1-16l is arranged around the left arc extinguishing chamber 2l, and the left gas guide structure 1-16l is also arranged around the left arc extinguishing area 1-13l for accommodating the left arc extinguishing chamber 2l. The right guide plate of the right gas guide structure 1-16r is arranged around the right arc extinguishing chamber 2r, and the right gas guide structure 1-16r is also arranged around the right arc extinguishing area 1-13r for accommodating the right arc extinguishing chamber 2r. The guide plates of the left gas guide structure 1-16l and the right gas guide structure 1-16r are also arranged around the moving contact mechanism 3 / housing shaft hole 1-12.

[0070] Furthermore, the side of the guide plate of the air-guiding structure facing the exhaust port of the arc-extinguishing chamber abuts against the side edge of the arc-extinguishing chute 2-1 to limit the arc-extinguishing chamber in the operating position. The end of each arc-extinguishing grid 2-2 located within the exhaust port of the arc-extinguishing chamber is spaced apart from the corresponding guide plate. Furthermore, the minimum spacing between each arc-extinguishing grid 2-2 and the corresponding guide plate is L2, where L2 is ≥ 0.8 mm. Furthermore, each guide plate is an arc-shaped plate, with the axis of the arc plate being the first axis. The side edge of each arc-extinguishing chute 2-1 opposite the guide plate structure is an arc-shaped side edge, with the axis of the arc-shaped side edge being the first axis. The shape of each guide plate matches the shape of the arc-shaped side edge of the corresponding arc-extinguishing chute 2-1. Specifically, the arc chute 2-1 is a sector-shaped plate, comprising an inner and outer arc-shaped edge disposed opposite each other. The radius of the inner edge is smaller than the radius of the outer edge, and the axes of both the inner and outer edges are the first axis. The inner edge is positioned proximate to the arc inlet of the arc extinguishing chamber, and the outer edge is positioned proximate to the exhaust port of the arc extinguishing chamber. As another embodiment of the mating relationship between the guide plate and the arc chute 2-1, the guide plate is not a curved plate, but rather the side of the guide plate facing the arc chute 2-1 is a curved side surface, the axis of the curved side surface being the first axis. The curved side surface of the guide plate matches the shape of the curved side edge of the arc chute 2-1, and the two are mutually restrained and engaged.

[0071] like Figure 1-2As shown, the switch unit also includes an arc isolation device 5, which includes an upper arc isolation device 5h and a lower arc isolation device 5d. The upper arc isolation device 5h includes an upper arc isolation wall 5-0h, and the lower arc isolation device 5d includes a lower arc isolation wall 5-0d. The upper arc isolation wall 5-0h and the lower arc isolation wall 5-0d are spaced relative to each other in a direction perpendicular to the motion plane of the moving contact portion to form a contact gap. The contact gaps correspond to the contact pairs and arc extinguishing chambers of the contact system c, respectively. One end of the contact gap is connected to the arc inlet of the corresponding arc extinguishing chamber. The moving contact portion moves within the contact gap to close and open with the corresponding static contact portion. The contact gap formed by the arc isolation device 5 prevents the arc generated by the opening and closing of the contact pair from overflowing, ensuring that all or most of the arc enters the arc extinguishing chamber and is extinguished. Furthermore, in a direction perpendicular to the motion plane of the moving contact portion, the width of the contact gap is less than the height of the gap between adjacent arc extinguishing grids, thereby facilitating the transfer of the arc from the contact gap to the arc extinguishing chamber, thereby improving arc extinguishing efficiency. Furthermore, at least one of the upper arc isolation wall 5-0h and the lower arc isolation wall 5-0d is an arc isolation wall made of a gas-generating material. The arc burns the arc isolation wall to generate gas, which is beneficial to further accelerate the transfer of the arc to the arc extinguishing chamber.

[0072] Furthermore, the upper arc-isolating device 5h also includes an upper magnetic plate 5-1h disposed on the upper arc-isolating wall 5-0h, and the lower arc-isolating device 5d includes a lower magnetic plate 5-1d disposed on the lower arc-isolating wall 5-0d. The upper magnetic plate 5-1h and the lower magnetic plate 5-1d are arranged relative to each other in a direction perpendicular to the motion plane of the moving contact portion, located on either side of the upper arc-isolating wall 5-0h and the lower arc-isolating wall 5-0d, respectively, and surround the motion trajectory of the moving contact portion from both sides. The upper magnetic plate 5-1h and the lower magnetic plate 5-1d are both made of magnetic material, which helps accelerate the transfer of the arc into the arc-extinguishing chamber. The upper magnetic plate 5-1h and the lower magnetic plate 5-1d can be locally reinforced in the moving area according to the movement of the arc. Furthermore, the arc-isolating device 5 of this embodiment can also be provided without the upper magnetic plate 5-1h and the lower magnetic plate 5-1d.

[0073] Specifically, the upper arc-isolating wall 5-0h and the lower arc-isolating wall 5-0d are arranged relative to each other along a first direction (i.e., a direction perpendicular to the plane of motion of the moving contact portion), forming two contact gaps located on either side of the moving contact mechanism 3 in the radial direction. These gaps respectively cooperate with the two contact pairs of the contact system c and the two arc-extinguishing chambers. In the first direction, the width of the contact gap is less than the height of the gap between adjacent arc-extinguishing grids. The upper arc-isolating wall 5-0h and the lower arc-isolating wall 5-0d are both circular plate-shaped structures and are provided with an arc-isolating wall shaft hole in the middle. The arc-isolating wall shaft hole allows external force to pass through and be applied to the moving contact mechanism 3. The upper arc-isolating wall 5-0h and the lower arc-isolating wall 5-0d are both circular ring-shaped structures. The outer edges of the upper arc-isolating wall 5-0h and the lower arc-isolating wall 5-0d are respectively overlapped with or abutted against the side edges of the two arc-extinguishing diaphragms 2-1 of the arc-extinguishing chamber, and the inner edges of the upper arc-isolating wall 5-0h and the lower arc-isolating wall 5-0d are respectively overlapped with the radial ends of the supporting body of the contact support. The upper magnetic conductive plate 5-1h and the lower magnetic conductive plate 5-1d are arranged relative to each other along a first direction and are respectively located on both sides of the upper arc-isolating wall 5-0h and the lower arc-isolating wall 5-0d in the first direction. The upper magnetic conductive plate 5-1h and the lower magnetic conductive plate 5-1d are preferably fan-shaped plates that adapt to the arc-shaped motion trajectory of the corresponding moving contact part and surround the motion trajectory of the corresponding moving contact part from both sides.

[0074] like Figure 1-4 FIG. 1 is an embodiment of the switch portion.

[0075] like Figure 1-4 As shown, in the switch portion of this embodiment, the structures of the switch units are the same, and each switch unit is recorded as a universal switch unit u3. In the contact system c of the universal switch unit u3, the front static contact 4f and the rear static contact 4b are centrally symmetrical structures with the rotation axis of the moving contact mechanism 3 as the central symmetry axis; on the projection of the switch portion perpendicular to the first direction, the contact systems c of each universal switch unit u3 overlap.

[0076] like Figure 1-3 As shown, in the switch portion of this embodiment, the shells of the universal switch units u3 have the same structure; on the projection of the switch portion perpendicular to the first direction, the shells of the universal switch units u3 overlap. Furthermore, the shells of the universal switch units u3 are symmetrical structures with the rotation axis of the moving contact mechanism 3 as the central symmetry axis. Furthermore, the static contact includes a static contact portion, a static contact connection portion and a terminal connected in sequence, and the static contact portion, the static contact connection portion and the terminal are all plate-like structures. The static contact portion and the static contact connection portion are coplanar, and the plane where the static contact connection portion is located is perpendicular to the plane where the terminal is located. Furthermore, the static contact portion and the static contact connection portion are integrally formed into a straight plate structure.

[0077] The number of parts of the universal switch unit u3 itself is reduced, which is beneficial to reducing the number of parts of the switch electrical appliance and simplifying the overall structure of the switch electrical appliance.

[0078] like Figure 1 、 3 As shown, in the universal switch unit u3, the left air outlet 1-14l and the right air outlet 1-14r are respectively arranged corresponding to a pair of top corners of the shell, that is, the left air outlet 1-14l and the right air outlet 1-14r can be respectively arranged at the vertices of a pair of top corners of the shell, or the left air outlet 1-14l and the right air outlet 1-14r are respectively arranged close to a pair of top corners of the shell.

[0079] Furthermore, the left air outlet 1-14l and the right air outlet 1-14r are respectively arranged on a pair of side walls of the shell (specifically the left side wall 1-19l and the right side wall 1-19r), and the two are parallel in direction. Furthermore, the left air outlet 1-14l and the right air outlet 1-14r are centrally symmetrical structures with the rotation axis of the moving contact mechanism 3 as the central symmetry axis. As other embodiments, the left air outlet 1-14l and the right air outlet 1-14r can also be respectively arranged on the front side wall 1-19f and the rear side wall 1-19b; or, the left air outlet 1-14l can be selectively arranged on the left side wall 1-19f, the rear side wall 1-19b or the front side wall 1-19f, and the right air outlet 1-14r can be selectively arranged on the right side wall 1-19r, the rear side wall 1-19b or the front side wall 1-19f.

[0080] like Figure 1 、 3As shown, in the universal switch unit u3, there are two groups of arc extinguishing areas - left arc extinguishing area 1-13l and right arc extinguishing area 1-13r, two groups of gas guide structures - left gas guide structure 1-16l and right gas guide structure 1-16r, two groups of internal air ducts - left internal air duct 1-15l and right internal air duct 1-15r, two groups of contact positions - front contact position 1-17f and rear contact position 1-17b, two groups of disconnection positions - front disconnection position and rear disconnection, two groups of partitions - front partition 1-18f and rear partition 1-18b, two groups of air outlets - left air outlet 1-14l and right air outlet 1-14r, two groups of arc extinguishing chambers - left arc extinguishing chamber 2l and right arc extinguishing chamber 2r , all of which are centrally symmetrical structures with the rotation axis of the moving contact mechanism 3 (i.e., the axis of the shell shaft hole 1-12) as the central symmetry axis; that is, in the universal switch unit 3, two groups of shell arc extinguishing structures-the shell left arc extinguishing structure and the shell right arc extinguishing structure, two groups of contact positions-the front contact position 1-17f and the rear contact position 1-17b, two groups of disconnection positions-the front disconnection position and the rear disconnection, two groups of partitions-the front partition 1-18f and the rear partition 1-18b, and two groups of arc extinguishing chambers-the left arc extinguishing chamber 2l and the right arc extinguishing chamber 2r, all of which are centrally symmetrical structures with the rotation axis of the moving contact mechanism 3 (i.e., the axis of the shell shaft hole 1-12) as the central symmetry axis.

[0081] Furthermore, the shell of the universal switch unit u3 is a centrally symmetrical structure with the axis of the shell shaft hole 1-12 as the central symmetry axis.

[0082] The following is an embodiment of the left air guiding structure 1-16l and the left combing column 1-20l of the general switch unit u3: The left air guiding structure 1-16l includes a first left guide plate 1-161l, a second left guide plate 1-162l, and a third left guide plate 1-163l that are arranged in sequence around the corresponding arc extinguishing chamber (left arc extinguishing chamber 1-20l) along the direction from the rear contact position 1-17b to the front disconnection position (which is also the movement direction of the moving contact part). That is, each left guide plate is arranged around the left arc extinguishing chamber 1-20l (and also around the left arc extinguishing area 1-13l). Each left guide plate is an arc-shaped plate, and an air passage is provided between adjacent left guide plates. The first left guide plate 1-161l is arranged close to the rear contact position 1-17b, and the first left guide plate 1-161l is also close to the rear side wall 1-19b and the front end of the arc extinguishing chamber of the left arc extinguishing chamber 2l. The third left guide plate 1-163l is arranged close to the front disconnection position, and the third left guide plate 1-163l is also close to the front side wall 1-19f and the rear end of the arc extinguishing chamber of the left arc extinguishing chamber 2l. An air passage is provided between one end of the first left guide plate 1-161l close to the rear contact position 1-17b (which is also one end of the first left guide plate 1-161l close to the front end of the arc extinguishing chamber of the left arc extinguishing chamber 2l) and the side wall of the housing (specifically the rear side wall 1-19b). An air passage is provided between one end of the third left guide plate 1-163l close to the front disconnection position (which is also one end of the first left guide plate 1-163l close to the rear end of the arc extinguishing chamber of the left arc extinguishing chamber 2l) and the side wall of the housing (specifically the front side wall 1-19f). Each air passage is connected to the left inner air passage 1-15l. Further, the left air guiding structure 1-16l further includes a first left auxiliary plate 1-164l and a second left auxiliary plate 1-165l. One end of the first left auxiliary plate 1-164l is connected to the middle of the first left guide plate 1-161l, and the other end (denoted as the free end of the first left auxiliary plate 1-164l) extends towards the left air outlet 1-14l. The free end of the first left auxiliary plate 1-164l extends into the left inner air passage 1-15l. The first left auxiliary plate 1-164l and the first left guide plate 1-161l form an "丄" shaped structure as a whole. One end of the second left auxiliary plate 1-165l (denoted as the inner end of the second left auxiliary plate 1-165l) extends into the air passage between the first left guide plate 1-161l and the second left guide plate 1-162l, and the other end (denoted as the outer end of the second left auxiliary plate 1-165l) extends towards the free end of the first left auxiliary plate 1-164l. The second left auxiliary plate 1-165l extends into the left inner air passage 1-15l. The inner end of the second left auxiliary plate 1-165l preferably abuts and is in a limiting fit with the side edge of the arc extinguishing partition 2-1 of the corresponding arc extinguishing chamber (left arc extinguishing chamber 2l). The outer end of the second left auxiliary plate 1-165l is relatively spaced from the free end of the first left auxiliary plate 1-164l, and the gap between the two faces the left combing column 1-20l.Furthermore, the left combing column 1-20l is a diamond column, the line connecting a pair of its edges is parallel to the direction of the left air outlet 1-14l and perpendicular to the rear side wall 1-19b, and the line connecting the other pair of edges is parallel to the rear side wall 1-19b. The second left auxiliary plate 1-165l includes the lower side of the second left auxiliary plate and the upper side of the second left auxiliary plate. The lower side of the second left auxiliary plate and the upper side of the second left auxiliary plate are bent and connected and form a V-shaped structure as a whole. The opening of the V-shaped structure faces the exhaust port of the corresponding arc extinguishing chamber (left arc extinguishing chamber 2l). One end of the lower side of the second left auxiliary plate is connected to the second left guide plate 1-162l and the other end is bent and connected to one end of the upper side of the second left auxiliary plate. The other end of the upper side of the second left auxiliary plate extends to the free end of the first left auxiliary plate 1-164l. The upper side of the second left auxiliary plate is located between the left combing column 1-20l and the first left guide plate 1-161l. The upper side of the second left auxiliary plate is arranged parallel to one side of the left combing column 1-20l.

[0083] like Figure 1 、 3 As shown, the right air guide structure 1-16r includes a first right guide plate 1-160r, a second right guide plate 1-161r, and a third right guide plate 1-162r, which are centrally symmetrical with the axis of the housing shaft hole 1-12 and are mutually centrally symmetrical with the first left guide plate 1-161l, the second left guide plate 1-162l, and the third left guide plate 1-163l. Furthermore, the right air guide structure 1-16r also includes a fourth right auxiliary plate 1-168r and a ninth right auxiliary plate 1-169r, which are centrally symmetrical with the first left auxiliary plate 1-164l and the second left auxiliary plate 1-165l, respectively, with the axis of the housing shaft hole 1-12 as the central axis.

[0084] like Figure 1 、 3 As shown, in the switch portion of this embodiment, each universal switch unit u3 includes a front phase partition plate 1-11f and a rear phase partition plate 1-11b, which are respectively arranged on the outer surfaces of a pair of side walls (front side wall 1-19f and rear side wall 1-19b) of the shell. The front phase partition plate 1-11f is used to separate the connection terminals of the front static contacts 4f of adjacent universal switch units u3, and the rear phase partition plate 1-11b is used to separate the connection terminals of the rear static contacts 4b of adjacent universal switch units u3.

[0085] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0086] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A switch unit, comprising a housing, a contact system (c), and an arc extinguishing chamber, both of which are arranged in the housing; the contact system (c) comprises a movable contact mechanism (3) and two groups of stationary contacts for use together, the movable contact mechanism (3) comprising two groups of movable contact portions, the movable contact portions being matched one-to-one with the stationary contact portions of the stationary contacts to form contact pairs matched one-to-one with the arc extinguishing chambers; the two groups of arc extinguishing chambers are respectively arranged on both radial sides of the movable contact mechanism (3) and respectively matched with the two groups of contact pairs, the arc extinguishing chambers comprising a plurality of arc extinguishing grids (2-2) arranged in sequence and spaced apart along the direction of movement of the movable contact portions; Its characteristics are: At least part of the arc extinguishing grids (2-2) of the arc extinguishing chamber is used as inner grids (2-21) and the other part is used as outer grids (2-22). At least one outer grid (2-22) is provided between adjacent inner grids (2-21). The outer grids (2-22) are offset relative to the inner grids (2-21) in a direction away from the motion trajectory of the moving contact portion. The two groups of static contacts are mutually symmetrical structures with the rotation axis of the moving contact mechanism (3) as the central symmetry axis.

2. The switch unit according to claim 1, wherein: The inner grid plates (2-21) and the outer grid plates (2-22) are arranged alternately in sequence.

3. The switch unit according to claim 1 or 2, characterized in that: Of all the arc-extinguishing grids (2-2) in the arc-extinguishing chamber, a portion serves as inner grids (2-21) and another portion serves as outer grids (2-22).

4. The switch unit according to claim 1, wherein: The moving contact mechanism (3) is arranged to rotate.

5. The switch unit according to claim 4, characterized in that: The static contact includes a static contact portion, a static contact connecting portion and a terminal connected in sequence. The static contact portion, the static contact connecting portion and the terminal are all plate-like structures. The static contact portion and the static contact connecting portion are coplanar, and the plane where the static contact connecting portion is located is perpendicular to the plane where the terminal is located.

6. The switch unit according to claim 4, characterized in that: The arc extinguishing chamber is a fan-shaped structure, one end of which is arranged adjacent to the static contact portion of the corresponding static contact and the other end of which extends to the position of the dynamic contact portion when the moving contact mechanism (3) moves to the disconnected position, and the arc extinguishing grids (2-2) are arranged radially around the moving contact mechanism (3).

7. The switch unit according to claim 6, characterized in that: In the arc extinguishing chamber, the angle between adjacent arc extinguishing grids (2-2) is α, and 0°≤α≤5°.

8. The switch unit according to claim 6, characterized in that: In the arc extinguishing chamber, the minimum distance between adjacent arc extinguishing grids is L1, and 0.6 mm ≤ L1 ≤ 1.0 mm.

9. The switch unit according to claim 6, characterized in that: The arc extinguishing chamber further comprises two arc extinguishing chute plates (2-1) arranged at a relative interval, and each arc extinguishing grid plate (2-2) is arranged between the two arc extinguishing chute plates (2-1) and is fixedly connected to the two arc extinguishing chute plates (2-1); the arc extinguishing chute plates (2-1) are fan-shaped plates, comprising an inner side edge and an outer side edge of an arc that are arranged relative to each other, the inner side edge and the outer side edge are concentric, and the radius of the inner side edge is smaller than the radius of the outer side edge, the inner side edge is arranged close to the arc inlet of the arc extinguishing chamber, and the outer side edge is arranged close to the exhaust port of the arc extinguishing chamber.

10. The switch unit according to claim 5, characterized in that: The switch unit further comprises an arc isolation device (5), the arc isolation device (5) comprising an upper arc isolation device (5h) and a lower arc isolation device (5d), the upper arc isolation device (5h) comprising an upper arc isolation wall (5-0h), the lower arc isolation device (5d) comprising a lower arc isolation wall (5-0d), the upper arc isolation wall (5-0h) and the lower arc isolation wall (5-0d) being arranged with relative spacing along the rotation axis of the moving contact mechanism (3) to form two groups of contact gaps, the contact gaps respectively matching the contact pairs and the arc extinguishing chambers one-to-one, one end of the contact gap being connected to the arc inlet of the corresponding arc extinguishing chamber, and the moving contact portion moving in the corresponding contact gap to close and open with the corresponding static contact portion.

11. The switch unit according to claim 10, characterized in that: In the rotational axis direction of the moving contact mechanism (3), the width of the contact gap is less than the height of the gap between adjacent arc-extinguishing grids.

12. The switch unit according to claim 10, characterized in that: The upper arc isolation device (5h) further comprises an upper magnetic conductive plate (5-1h) arranged on the upper arc isolation wall (5-0h), and the lower arc isolation device (5d) further comprises a lower magnetic conductive plate (5-1d) arranged on the lower arc isolation wall (5-0d). The upper magnetic conductive plate (5-1h) and the lower magnetic conductive plate (5-1d) are arranged with relative spacing along the rotation axis of the moving contact mechanism (3), and are respectively located on both sides of the upper arc isolation wall (5-0h) and the lower arc isolation wall (5-0d), surrounding the motion trajectory of the corresponding moving contact portion from both sides.

13. The switch unit according to claim 12, characterized in that: The upper magnetic conductive plate (5-1h) and the lower magnetic conductive plate (5-1d) are both fan-shaped plates.

Images