Switch unit and isolating switch or dual-power change-over switch

Abstract

The invention discloses a switch unit and an isolating switch or a dual-power change-over switch, and relates to the technical field of low-voltage electric appliances. The switch unit comprises a moving contact, a static contact and an arc striking piece, the moving contact moves relative to the static contact so that the moving contact and the static contact can be switched on and switched off, the arc striking piece is arranged on the moving path of the moving contact, the arc striking piece is located on the side, away from the static contact, of an arc extinguishing mechanism, and the arc extinguishing mechanism is arranged on the moving path of the moving contact. And when the moving contact moves towards one side deviating from the static contact, the arc striking sheet can be in clamping contact with the moving contact. The switch unit can solve the problem that the opening distance between the contacts is reduced due to the fact that the moving contact rebounds due to collision during opening in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a switch unit and an isolating switch or a dual power transfer switch. Background Art

[0002] Switching devices play two roles in the power system: one is the control role, that is, according to the operation needs of the power system, a part of the power equipment or lines are put into or out of operation; the other is the protection role, that is, when a fault occurs in the power equipment or line, the faulty part is quickly removed from the power system to ensure the normal operation of the fault-free part of the power system.

[0003] In existing technology, the moving contact of a switch can rotate relative to the stationary contact, moving away from or approaching the stationary contact to achieve opening and closing. In existing products, when the moving contact moves away from the stationary contact to open the circuit, it will rebound after hitting a stopper, reducing the distance between the two contacts and posing a safety hazard of incomplete disconnection. Summary of the Invention

[0004] The purpose of the present application is to provide a switch unit and an isolating switch or a dual power transfer switch, which can solve the problem in the prior art that the opening distance between contacts is reduced due to the rebound of the moving contact caused by impact when the switch is opened.

[0005] The embodiment of the present application is implemented as follows: In a first aspect of an embodiment of the present application, a switch unit is provided, comprising a movable contact, a stationary contact, and an arc-striking piece. The movable contact moves relative to the stationary contact to open and close the movable and stationary contacts. The arc-striking piece is disposed along the movable contact's movement path and is located on a side of an arc-extinguishing mechanism facing away from the stationary contact. When the movable contact moves toward a side facing away from the stationary contact, the arc-striking piece can engage with the movable contact. This switch unit can address the prior art problem of reduced contact spacing due to rebounding of the movable contact caused by impact during opening.

[0006] As an implementable embodiment, the moving contact includes a contact bracket and two moving contact pieces arranged at intervals. The contact bracket is driven to move the two moving contact pieces so that the two moving contact pieces respectively clamp the opposite sides of the arc-striking piece. The arc-striking piece is made of conductive material and is used to transfer the arc on the moving contact to the arc extinguishing mechanism.

[0007] As an implementable embodiment, the arc extinguishing mechanism includes an installation chamber and an arc extinguishing grid arranged in the installation chamber, the arc striking plate includes a fixedly connected clamping portion and an arc striking portion, the clamping portion is arranged on the movement path of the moving contact and is used to cooperate with the moving contact, and the arc striking portion extends toward a side close to the installation chamber.

[0008] As an implementation method, the arc-striking portion extends into the installation chamber, and the arc-striking portion has an arc-striking surface. The arc-striking surface is located in the installation chamber and is parallel or approximately parallel to the arc-extinguishing grid.

[0009] As an implementation method, a guide portion is provided on the arc-striking piece, and the guide portion is located on the side of the clamping portion close to the static contact, and is used to guide the arc-striking piece to be clamped by the two moving contact pieces. The vertical distance between the guide portion and the moving contact is greater than the vertical distance between the clamping portion and the moving contact.

[0010] As an implementable embodiment, the installation chamber is divided into a first sub-chamber close to the static contact and a second sub-chamber away from the static contact, the arc extinguishing grid includes a first sub-grid located in the first sub-chamber and a second sub-grid located in the second sub-chamber, and the arc extinguishing mechanism also includes a conductive grid, which is located on the side of the installation chamber away from the moving contact; the conductive grid is connected to the first sub-grid and extends toward the second sub-chamber, and / or the conductive grid is connected to the second sub-grid and extends toward the first sub-chamber.

[0011] As an implementation method, the first sub-grid includes an arc-striking grid, a first end of the arc-striking grid is connected to the static contact, and a second end of the arc-striking grid is connected to the conductive grid.

[0012] As an implementable embodiment, the moving contact moves toward the side away from the static contact, the moving contact and the static contact switch from the closed state to the open state, and the arc striking piece is located at the extreme position where the moving contact and the static contact are in the open state.

[0013] As an implementable embodiment, the number of the static contacts is one or two, and the number of the moving contacts and the arc-striking pieces is equal to the number of the static contacts.

[0014] A second aspect of the embodiments of the present application provides an isolating switch or dual power transfer switch, comprising a handle, an operating mechanism, and the aforementioned switch unit. The switch units are multiple, and the multiple switch units and the operating mechanism are stacked in sequence. The handle is drivingly connected to the movable contacts of the multiple switch units via the operating mechanism. The handle is used to drive the operating mechanism to rotate, thereby driving the movable contacts of the multiple switch units to rotate synchronously. This switch unit can solve the problem in the prior art of reduced contact spacing due to rebound of the movable contact caused by impact during opening.

[0015] The beneficial effects of the embodiments of the present application include: The switch unit includes a moving contact, a static contact and an arc-striking piece. The moving contact moves relative to the static contact to open and close the moving contact and the static contact. The arc-striking piece is arranged on the movement path of the moving contact, and the arc-striking piece is located on the side of the arc extinguishing mechanism away from the static contact. When the moving contact moves toward the side away from the static contact, the arc-striking piece can be clamped and contacted with the moving contact. When the switch unit is closed, the operating mechanism drives the moving contact to move toward the side close to the static contact so that the moving contact contacts and presses the static contact, thereby completing the conduction of the circuit; when the switch unit is opened, the operating mechanism drives the moving contact to move toward the side away from the static contact. First, the static contact separates from the static contact to form an arc. Then, the moving contact continues to move to the arc-striking piece position. The arc-striking piece can be clamped and contacted with the moving contact. For example, the arc-striking piece can be clamped and contacted by the passive contact, or the moving contact can be clamped and contacted by the arc-striking piece. On the one hand, the arc on the moving contact is transferred to the arc-striking piece and then enters the arc extinguishing mechanism, and no longer burns the moving contact. On the other hand, the friction force and structural resistance hinder the moving contact from continuing to move, so that the moving contact's movement speed is reduced, and finally it stops smoothly under the action of the arc-striking piece. In the above process, the arc-striking piece can prevent the arc from staying on the moving contact to burn the moving contact and can also absorb the kinetic energy of the moving contact to prevent it from rebounding after hitting the limit part on the shell due to inertia. Compared with the existing technology, the switch unit provided in this application realizes opening and closing control through the mutual cooperation of the moving contact and the static contact, and also realizes the clamping contact cooperation between the moving contact and the arc-striking piece so that the arc-striking piece can play a buffering role for the opening movement of the moving contact, thereby solving the rebound problem and the burning problem of the moving contact when the moving contact is opened, ensuring that the opening distance between the moving contact and the static contact is within a safe range, thereby improving the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of the closed state of a switch unit provided in an embodiment of the present application; Figure 2 One of the structural schematic diagrams of the open state of the switch unit provided in the embodiment of the present application; Figure 3 The second structural diagram of the switch unit in the open state provided by the embodiment of the present application; Figure 4 for Figure 3 A partial enlarged view of Figure 5 A schematic diagram of the structure of the arc extinguishing mechanism provided in an embodiment of the present application; Figure 6 A schematic structural diagram of the static contact and arc-striking grid provided in an embodiment of the present application.

[0018] Icon: 100- switch unit; 10- moving contact; 11- contact bracket; 12- moving contact piece; 20- stationary contact; 30- arc-striking piece; 31- clamping portion; 32- arc-striking portion; 321- arc-striking surface; 33- guide portion; 40- arc-extinguishing mechanism; 41- installation chamber; 411- first sub-chamber; 412- second sub-chamber; 42- arc-extinguishing grid; 421- first sub-grid; 4211- arc-striking grid; 422- second sub-grid; 43- conducting grid; 431- connecting section; 432- extension section; 50- rib; A- arrangement direction; B- extension direction. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0020] In the description of this application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of the application is usually placed when in use. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. Terms such as "first", "second", and "third" are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0021] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections, indirect connections through an intermediate medium, or connections within two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0022] Please refer to Figures 1 to 4 The present invention provides a switch unit 100 comprising a movable contact 10, a stationary contact 20, and an arc-striking piece 30. The movable contact 10 moves relative to the stationary contact 20 to open and close the movable contact 10 and the stationary contact 20. The arc-striking piece 30 is arranged along the movement path of the movable contact 10 and is located on the side of the arc extinguishing mechanism 40 facing away from the stationary contact 20. When the movable contact 10 moves toward the side facing away from the stationary contact 20, the arc-striking piece 30 can clamp and contact the movable contact 10. This switch unit 100 can solve the problem in the prior art of reduced contact spacing caused by rebound of the movable contact 10 due to impact during opening.

[0023] It should be noted that the switch unit 100 includes a moving contact 10, a static contact 20 and an arc-striking piece 30, wherein the moving contact 10 can be made of a high-conductivity copper alloy and have a sheet-like or columnar structure; the static contact 20 can be fixedly installed on the housing of the switch unit 100, and the material can be consistent with the moving contact 10. The contact surface can be silver-plated to reduce the contact resistance. The moving contact 10 can be connected to the operating mechanism through a rotating shaft or a sliding rail so that the operating mechanism can drive the moving contact 10 to move relative to the static contact 20, thereby realizing the opening and closing of the switch unit 100. The arc-striking piece 30 can be made of arc-resistant material (such as graphite or copper-tungsten alloy) and has a blade-shaped structure. The arc-striking piece 30 can be fixedly installed on the movement trajectory of the moving contact 10, and the arc-striking piece 30 is located on the side of the arc extinguishing mechanism 40 away from the static contact 20.

[0024] When the switch unit 100 is closed, the operating mechanism drives the moving contact 10 to move toward the side close to the static contact 20, so that the moving contact 10 contacts and presses the static contact 20, thereby completing the conduction of the circuit; when the switch unit 100 is opened, the operating mechanism drives the moving contact 10 to move toward the side away from the static contact 20. First, the static contact 20 separates from the static contact 20 to form an arc. Then, the moving contact 10 continues to move to the position of the arc striking piece 30. The arc striking piece 30 can be clamped and contacted with the moving contact 10. For example, the arc striking piece 30 can be clamped and contacted by the moving contact 10, or the moving contact 10 can be clamped and contacted by the arc striking piece 30. On the one hand, the arc on the moving contact 10 is transferred to the arc striking piece 30 and then enters the arc extinguishing mechanism 40, and no longer burns the moving contact 10. On the other hand, the friction force and structural resistance hinder the moving contact 10 from continuing to move, so that the movement speed of the moving contact 10 is reduced, and finally it stops smoothly under the action of the arc striking piece 30. During the above process, the arc striking piece 30 can prevent the arc from staying on the moving contact 10 and burning the moving contact 10 and can also absorb the kinetic energy of the moving contact 10 to prevent it from rebounding after hitting the limit part on the housing due to inertia.

[0025] Compared with the prior art, the switch unit 100 provided in the present application realizes opening and closing control through the mutual cooperation of the moving contact 10 and the static contact 20, and also realizes the clamping contact cooperation between the moving contact 10 and the arc-striking piece 30, so that the arc-striking piece 30 can play a buffering role for the opening movement of the moving contact 10, thereby solving the rebound problem of the moving contact 10 when opening and the burning problem of the moving contact 10, ensuring that the opening distance between the moving contact 10 and the static contact 20 is within a safe range, thereby improving the safety of the product.

[0026] As an implementable method, Figures 1 to 4As shown, the moving contact 10 includes a contact bracket 11 and two moving contact pieces 12 arranged at intervals. The contact bracket 11 is driven to move the two moving contact pieces 12 so that the two moving contact pieces 12 respectively clamp the opposite sides of the arc-striking piece 30. The arc-striking piece 30 is made of conductive material and is used to transfer the arc on the moving contact 10 to the arc extinguishing mechanism 40.

[0027] It should be noted that the switch unit 100 also includes an arc extinguishing mechanism 40, which extinguishes the arc generated by the opening of the moving contact 10 and the static contact 20 through an arc extinguishing structure. On this basis, the conductive properties of the arc striker 30 are also utilized to form an arc extinguishing system of "arc transfer and arc extinguishing". Specifically, the arc extinguishing mechanism 40 can be fixedly mounted on one side of the moving contact 10 and the static contact 20, and the arc extinguishing mechanism 40 and the arc striker 30 are located on the same side of the static contact 20 (i.e., next to the movement path of the moving contact 10). The arc striker 30 can be made of a conductive arc-resistant material (such as copper-tungsten alloy), which maintains arc resistance and has good conductivity, so that the arc on the moving contact 10 can be transferred to the arc extinguishing mechanism 40 through the arc striker 30.

[0028] The movable contact 10 includes a contact support 11 and two movable contact pieces 12 spaced apart on the contact support 11. The contact support 11 can be connected to an operating mechanism via a rotating shaft so that the contact support 11 can rotate about the rotating shaft. There are two movable contact pieces 12, which are spaced apart and mounted parallel to the contact support 11. When the switch unit 100 switches from the closed state to the open state, the operating mechanism drives the contact support 10 to rotate about the rotating shaft, causing the two movable contact pieces 12 to rotate synchronously, gradually moving away from the stationary contact 20. As the movable contact piece 12 rotates, it gradually approaches the arc-striking piece 30. Ultimately, the arc-striking piece 30 can be clamped by the two movable contact pieces 12. In other words, the two movable contact pieces 12 respectively contact and clamp the arc-striking piece 30 from opposite sides of the arc-striking piece 30. When clamped, the moving contact piece 12 fits tightly against the surface of the arc-striking piece 30, forming a conductive connection while limiting the continued rotation of the moving contact 10 through friction. When closing the circuit, the contact bracket 11 rotates in the opposite direction, driving the moving contact piece 12 to separate from the arc-striking piece 30, gradually approaching the static contact 20, and finally achieving contact.

[0029] When the switch unit 100 is opened, the moving contact 10 and the stationary contact 20 separate, generating an arc between them. At this point, the arc primarily burns between the moving contact 10 and the stationary contact 20. Subsequently, the moving contact 10 continues to move toward the side away from the stationary contact 20. When the moving contact 10 contacts the arc-strike plate 30, because the arc-strike plate 30 is made of conductive material and has the same potential as the moving contact 10, the arc is transferred from the surface of the moving contact 10 to the surface of the arc-strike plate 30 due to the "near-cathode effect" and magnetic field force (if the arc-extinguishing mechanism 40 includes a magnetic blow-out coil). In this way, the arc can be guided into the mounting chamber 41 through the arc-strike plate 30, where it can be effectively extinguished, preventing the arc from remaining on the moving contact 10 and burning it.

[0030] In this embodiment, the symmetrical clamping structure of the two moving contact pieces 12 ensures balanced force on the arc striking piece 30, avoids positional deviation caused by unilateral force, and ensures a stable arc transfer path. During clamping, the moving contact piece 12 is in close contact with the surface of the arc striking piece 30, so the arc on the moving contact 10 can be smoothly transferred to the arc striking piece 30, and then introduced into the arc extinguishing mechanism 40 through the arc striking piece 30, thereby achieving efficient arc transfer and extinguishing.

[0031] As an implementable method, Figures 1 to 4 As shown, the arc extinguishing mechanism 40 includes an installation chamber 41 and an arc extinguishing grid 42 arranged in the installation chamber 41. The arc striking piece 30 includes a fixedly connected clamping portion 31 and an arc striking portion 32. The clamping portion 31 is arranged on the movement path of the moving contact 10 and is used to cooperate with the moving contact 10. The arc striking portion 32 extends toward a side close to the installation chamber 41.

[0032] It should be noted that the arc extinguishing mechanism 40 includes an installation chamber 41 and an arc extinguishing grid 42 arranged in the installation chamber 41. The installation chamber 41 can be made of ceramic or arc-resistant plastic, and the arc extinguishing grid 42 can be made of iron-nickel alloy with high magnetic permeability and high temperature resistance. The edge of the arc extinguishing grid 42 can be designed to be serrated to enhance the cutting and cooling effect of the arc extinguishing grid 42 on the arc. In addition, a gas-generating material (such as polytetrafluoroethylene) or a magnetic blowing coil can be provided on the inside of the installation chamber 41. The gas-generating material can decompose into inert gas (such as fluoride) under the high temperature of the arc, and the magnetic blowing coil can stretch the arc through the magnetic field force, thereby quickly extinguishing the arc.

[0033] The arc-striking piece 30 includes a fixedly connected clamping portion 31 and an arc-striking portion 32. The clamping portion 31 is arranged on the movement path of the moving contact 10. After the moving contact 10 contacts the clamping portion 31 of the arc-striking piece 30, the arc first burns on the surface of the clamping portion 31 and then moves rapidly along the arc-striking portion 32 toward the installation chamber 41.

[0034] As an implementable method, Figure 2 and Figure 4 As shown, the arc-striking portion 32 extends into the mounting chamber 41 . The arc-striking portion 32 has an arc-striking surface 321 . The arc-striking surface 321 is located in the mounting chamber 41 and is parallel or approximately parallel to the arc-extinguishing grid 42 .

[0035] It should be noted that the design of the arc-striking portion 32 extending into the mounting chamber 41 can transfer the arc on the moving contact 10 into the mounting chamber 41. After the arc-striking portion 32 introduces the arc into the mounting chamber 41, the arc-extinguishing grid 42 divides the arc, allowing the arc to be extinguished quickly, thereby reducing arc erosion of the moving contact 10. The arc-striking surface 321 is the side surface of the arc-striking portion 32 extending into the mounting chamber 41. The arc-striking surface 321 can be a flat surface or a slightly arced surface. The arc-striking surface 321 remains parallel or approximately parallel to the main plane of the arc-extinguishing grid 42, ensuring a uniform gap between the arc-striking surface 321 and adjacent arc-extinguishing grids 42. The arc-striking surface 321 extends along the extension direction of the arc-extinguishing grid 42, which can enhance the guidance of the arc along the arc-striking surface 321. The edges of the arc-striking surface 321 have rounded corners to prevent arc deviation caused by tip discharge.

[0036] As an implementable method, Figure 1 and Figure 3 As shown, a guide portion 33 is provided on the arc-striking piece 30, and the guide portion 33 is located on the side of the clamping portion 31 close to the static contact 20, and is used to guide the arc-striking piece 30 to be clamped by the two moving contact pieces 12. The vertical distance between the guide portion 33 and the moving contact 10 is greater than the vertical distance between the clamping portion 31 and the moving contact 10, so as to reduce the kinetic energy loss of the moving contact piece 12 before reaching the clamping portion 31.

[0037] It should be noted that the guide portion 33 is provided on opposite sides of the arc-striking piece 30 where it is clamped (i.e., the surfaces in contact with the two moving contact pieces 12), and is located at one end of the clamping portion 31 close to the static contact 20. The vertical distance between the guide portion 33 and the moving contact 10 is greater than the vertical distance between the clamping portion 31 and the moving contact 10, so that the guide portion 33 and the clamping portion 31 form a step structure. Alternatively, the vertical distance between the guide portion 33 and the moving contact 10 gradually decreases to be equal to the vertical distance between the clamping portion 31 and the moving contact 10. In this case, the guide portion 33 has a bevel transition structure and can gradually thicken from the edge to the middle of the arc-striking piece 30, thereby forming a smooth guide bevel. The inclination angle can be 30° to 45°, and the end of the guide bevel is smoothly connected to the working surface of the clamping portion 31 of the arc-striking piece 30 (i.e., the plane when the moving contact piece 12 is finally clamped).

[0038] In this embodiment, when the contact bracket 11 drives the two movable contact pieces 12 to rotate toward the arc striking piece 30, the movable contact pieces 12 first pass through the guide portion 33 that contacts the arc striking piece 30. Due to the guiding effect of the guide portion 33, the movable contact pieces 12 can be aligned with the working surface of the clamping portion 31 of the arc striking piece 30. As the movable contact pieces 12 continue to rotate, under the continuous guidance of the guide portion 33, the two movable contact pieces 12 gradually fit the working surface of the clamping portion 31 of the arc striking piece 30, and finally symmetrically clamp the arc striking piece 30 from opposite sides of the arc striking piece 30, avoiding unilateral force or poor contact caused by offset.

[0039] As an implementable method, Figure 5 As shown, the installation chamber 41 is divided into a first sub-chamber 411 on the side close to the static contact 20 and a second sub-chamber 412 on the side away from the static contact 20. The arc extinguishing grid 42 includes a first sub-grid 421 located in the first sub-chamber 411 and a second sub-grid 422 located in the second sub-chamber 412. The arc extinguishing mechanism 40 also includes a conductive grid 43, which is located on the side of the installation chamber 41 away from the moving contact 10; the conductive grid 43 is connected to the first sub-grid 421 and extends toward the second sub-chamber 412, and / or the conductive grid 43 is connected to the second sub-grid 422 and extends toward the first sub-chamber 411.

[0040] It should be noted that the installation chamber 41 is divided into a first sub-chamber 411 and a second sub-chamber 412 along the movement direction of the moving contact 10 (from close to the static contact 20 to away from the static contact 20), and the two sub-chambers jointly cover the arc generation and migration area when the moving contact 10 is opened; the arc extinguishing grid 42 includes a first sub-grid 421 and a second sub-grid 422, the first sub-grid 421 is evenly distributed in the first sub-chamber 411 (close to the static contact 20), and the second sub-grid 422 is evenly distributed in the second sub-chamber 412 (away from the static contact 20), and the arrangement direction of the two groups of sub-grids is perpendicular or approximately perpendicular to the movement path of the moving contact 10, and the spacing between two adjacent sub-grids is consistent to ensure the uniformity of the electric field.

[0041] On this basis, the arc extinguishing mechanism 40 also includes a conductive grid 43. The material of the conductive grid 43 can be the same as that of the arc extinguishing grid 42. The conductive grid 43 is located on the side of the installation chamber 41 away from the moving contact 10. The conductive grid 43 is connected to the first sub-grid 421 and extends toward the second sub-chamber 412, and / or the conductive grid 43 is connected to the second sub-grid 422 and extends toward the first sub-chamber 411.

[0042] When the moving contact 10 moves from the closing position to the opening direction, an arc is generated at the moment when the moving contact 10 separates from the static contact 20. In the initial stage of opening, the arc is located between the moving contact 10 and the static contact 20, close to the entrance of the first sub-chamber 411. When the conductive grid 43 is connected to the first sub-grid 421 and extends toward the second sub-chamber 412, the additional electric field formed by it significantly increases the electric field strength in the second sub-chamber 412 (i.e., the deep part). The arc, which was originally difficult to migrate due to the weak electric field strength in the second sub-chamber 412, will be attracted to move toward the second sub-chamber 412 under the action of the high electric field. In this way, the arc It can enter the first sub-chamber 411 and the second sub-chamber 412 and be cut and cooled by the first sub-grid 421 and the second sub-grid 422, thereby ultimately improving the arc extinguishing capability of high voltage; and / or, when the conductive grid 43 is connected to the second sub-grid 422 and extends toward the first sub-chamber 411, the additional electric field formed therein can also significantly increase the electric field strength in the second sub-chamber 412 (i.e., deep inside), thereby improving the migration capability of the arc, thereby improving the arc extinguishing efficiency of the arc extinguishing mechanism, and at the same time, avoiding long-term burning in the sweeping area of ​​the moving contact 10, thereby improving the service life of the moving contact 10.

[0043] As an implementable method, Figure 6 As shown, the first sub-grid 421 includes an arc-striking grid 4211 . The first end of the arc-striking grid 4211 can be connected to the static contact 20 by welding or bolting, and the second end can be directly connected to the conductive grid 43 .

[0044] It should be noted that when the switch is opened, the moving contact 10 and the static contact 20 are separated to generate an arc. In the initial stage of opening the switch, the arc adheres to the surface of the static contact 20. Since the arc-striking grid 4211 is conductively connected to the static contact 20, its potential is consistent with that of the static contact 20. Under the action of the electric field force and the thermal buoyancy, the arc is transferred from the surface of the static contact 20 to the first end of the arc-striking grid 4211. The arc moves toward the second end along the extension direction of the arc-striking grid 4211 (because the second end is located in the strong arc extinguishing area of ​​the installation chamber 41, forming an arc migration driving force). Finally, it transitions from the second end of the arc-striking grid 4211 to the first sub-grid 421 and enters the arc-splitting process of the arc-extinguishing grid 42, which not only reduces the ablation loss of the static contact 20, but also enhances the breaking capacity of the switch unit 100; the electric field strength at the arc-striking grid 4211 is relatively high, and one end of the conductive grid 43 is directly connected to the arc-striking grid 4211, and the other end extends toward the second sub-grid 422, which can increase the electric field strength at the second sub-grid 422, making it easier for the arc to enter the first sub-chamber 411 and the second sub-chamber 412.

[0045] Furthermore, a rib 50 is provided. The conductive grid 43 includes a connecting section 431 connected to the first sub-grid 421 and / or the second sub-grid 422 and an extension section 432 extending along the arrangement direction A of the arc-quenching grids 42. The rib 50 is located between the arc-quenching grid 42 and the extension section 432 to ensure insulation between the extension section 432 and the remaining arc-quenching grids 42 (i.e., the arc-quenching grids 42 other than the first sub-grid 421 and / or the second sub-grid 422 connected to the conductive grid 43) to prevent breakdown from occurring and causing failure of some arc-quenching grids 42. Furthermore, the projection of the first rib 50 along the extension direction B of the arc-quenching grid 42 covers the projection of the extension section 432 along the extension direction B of the arc-quenching grid 42.

[0046] As an implementable method, Figures 1 to 4 As shown, the moving contact 10 moves toward the side away from the static contact 20, and the moving contact 10 and the static contact 20 switch from the closed state to the open state. The arc-starting piece 30 is located at the extreme position where the moving contact 10 and the static contact 20 are in the open state.

[0047] It should be noted that when the moving contact 10 and the static contact 20 are in the extreme position of the open state, the moving contact 10 moves to the maximum stroke. At this time, the opening distance between the moving contact 10 and the static contact 20 reaches the maximum value, and the front end of the arc-striking piece 30 is in contact with the side of the moving contact 10 in the extreme position. The distance between the center of the clamping part 31 of the arc-striking piece 30 and the front end of the arc-striking piece 30 can be controlled at 5~8mm, ensuring that the continued movement of the moving contact 10 is completely restricted.

[0048] As an implementable method, Figures 1 to 4 As shown, the number of the static contacts 20 is one or two, and the number of the moving contacts 10 and the arc-starting pieces 30 is equal to the number of the static contacts 20 .

[0049] It should be noted that the number of static contacts 20, moving contacts 10, and arc-striking pieces 30 remains consistent, forming a one-to-one matching relationship. For example, when there is one static contact 20, there is also one moving contact 10 and one arc-striking piece 30, and the moving contact 10 is set corresponding to the static contact 20, and the arc-striking piece 30 is located on the movement path of the moving contact 10, and the three form a set of independent opening and closing and arc extinguishing units; when there are two static contacts 20, there are also two moving contacts 10 and two arc-striking pieces 30, and the two static contacts 20 can be centrally symmetrically distributed with the rotating shaft as the center of symmetry, each static contact 20 corresponds to a moving contact 10, and an arc-striking piece 30 is set on the movement path of each moving contact 10, forming two sets of parallel opening and closing and arc extinguishing units, and the arc extinguishing mechanism 40 can be shared or independently set to achieve double-breakpoint arc extinguishing, enhance the arc extinguishing effect, and improve the breaking capacity and reliability of the switch unit 100.

[0050] The present application also provides an isolating switch or dual power transfer switch, comprising a handle, an operating mechanism, and the aforementioned switch unit 100. There are multiple switch units 100, and the multiple switch units 100 and the operating mechanism are sequentially stacked. The handle is drivingly connected to the movable contacts 10 of the multiple switch units 100 through the operating mechanism. The handle is used to drive the operating mechanism to rotate, thereby driving the movable contacts 10 of the multiple switch units 100 to rotate synchronously. Since the structure and beneficial effects of the switch unit 100 have been described in detail in the previous embodiment, they will not be repeated here.

[0051] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

Claims

1. A switch unit, characterized in that: The invention comprises a moving contact (10), a stationary contact (20) and an arc-striking piece (30); the moving contact (10) moves relative to the stationary contact (20) so as to open and close the moving contact (10) and the stationary contact (20); the arc-striking piece (30) is arranged on the moving path of the moving contact (10), and the arc-striking piece (30) is located on the side of the arc extinguishing mechanism (40) away from the stationary contact (20); when the moving contact (10) moves toward the side away from the stationary contact (20), the arc-striking piece (30) can be in clamping contact with the moving contact (10).

2. The switch unit according to claim 1, characterized in that The movable contact (10) comprises a contact support (11) and two movable contact pieces (12) arranged at intervals. The contact support (11) is driven to move the two movable contact pieces (12) so that the two movable contact pieces (12) respectively clamp the opposite sides of the arc-striking piece (30). The arc-striking piece (30) is made of a conductive material. The arc-striking piece (30) is used to transfer the arc on the movable contact (10) to the arc extinguishing mechanism (40).

3. The switch unit according to claim 2, characterized in that The arc extinguishing mechanism (40) comprises an installation chamber (41) and an arc extinguishing grid (42) arranged in the installation chamber (41); the arc striking piece (30) comprises a clamping portion (31) and an arc striking portion (32) that are fixedly connected; the clamping portion (31) is arranged on a movement path of the moving contact (10) and is used to cooperate with the moving contact (10); and the arc striking portion (32) extends toward a side close to the installation chamber (41).

4. The switch unit according to claim 3, characterized in that The arc-striking portion (32) extends into the installation chamber (41), and the arc-striking portion (32) has an arc-striking surface (321). The arc-striking surface (321) is located in the installation chamber (41) and is parallel or approximately parallel to the arc-extinguishing grid (42).

5. The switch unit according to claim 3, characterized in that A guide portion (33) is provided on the arc-striking piece (30), and the guide portion (33) is located on a side of the clamping portion (31) close to the static contact (20) and is used to guide the arc-striking piece (30) to be clamped by the two moving contact pieces (12). The vertical distance between the guide portion (33) and the moving contact (10) is greater than the vertical distance between the clamping portion (31) and the moving contact (10).

6. The switch unit according to claim 3, characterized in that The installation chamber (41) is divided into a first sub-chamber (411) on a side close to the static contact (20) and a second sub-chamber (412) on a side away from the static contact (20); the arc extinguishing grid (42) includes a first sub-grid (421) located in the first sub-chamber (411) and a second sub-grid (422) located in the second sub-chamber (412); the arc extinguishing mechanism (40) further includes a conductive grid (43), the conductive grid (43) is located on a side of the installation chamber (41) away from the moving contact (10); the conductive grid (43) is connected to the first sub-grid (421) and extends toward the second sub-chamber (412), and / or the conductive grid (43) is connected to the second sub-grid (422) and extends toward the first sub-chamber (411).

7. The switch unit according to claim 6, characterized in that The first sub-grid (421) comprises an arc-striking grid (4211), wherein a first end of the arc-striking grid (4211) is connected to the static contact (20), and a second end of the arc-striking grid (4211) is connected to the conductive grid (43).

8. The switch unit according to claim 1, characterized in that The movable contact (10) moves toward a side away from the static contact (20), the movable contact (10) and the static contact (20) switch from a closed state to an open state, and the arc striking piece (30) is located at an extreme position where the movable contact (10) and the static contact (20) are in the open state.

9. The switch unit according to claim 1, characterized in that The number of the static contacts (20) is one or two, and the number of the moving contacts (10) and the arc-starting pieces (30) is equal to the number of the static contacts (20).

10. An isolating switch or a dual power transfer switch, characterized in that: The invention comprises a handle, an operating mechanism, and a switch unit (100) according to any one of claims 1 to 9, wherein the number of the switch units (100) is plural, and the plural switch units (100) and the operating mechanism are stacked in sequence, the handle is drivingly connected to the movable contacts (10) of the plural switch units (100) through the operating mechanism, and the handle is used to drive the operating mechanism to rotate, so as to drive the movable contacts (10) of the plural switch units (100) to rotate synchronously.

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