Change-over switch

Abstract

The utility model discloses a change-over switch, and relates to the technical field of electrical switches, and the change-over switch comprises a housing, a contact assembly, and a transmission member. The contact assembly comprises a contact support arranged on the shell in a sliding mode, a static contact fixedly installed on the shell and a moving contact installed on the contact support, and the contact support is provided with a hanging hole. The transmission piece comprises a first force arm, a rotating part and a second force arm which are integrally formed, the first force arm and the second force arm are distributed on the peripheral side of the rotating part at intervals, and the rotating part is rotationally connected to the shell. A connecting hook is arranged at the tail end of the second force arm and movably connected with the hanging hole. Wherein the first force arm is stressed to enable the transmission part to rotate, and the second force arm drives the contact support to slide through the matching of the connecting hook and the hooking hole, so that the contact and separation of the moving contact and the static contact are realized. The change-over switch provided by the utility model can simplify the structure and improve the assembly efficiency.

Description

Technical Field

[0001] This application relates to the field of electrical switch technology, specifically to a changeover switch. Background Technology

[0002] In dual-coil electromagnetic switching devices (such as contactors), in order to balance the high current drive requirements during the startup phase and the low energy consumption characteristics during the holding phase, it is usually necessary to disconnect the startup coil circuit and connect the holding coil circuit through a changeover switch after the contactor is energized.

[0003] Existing changeover switches include a transmission component, an energy storage component, a contact support, a return spring, a moving contact, and a stationary contact. The contact support, under the opposing action of the transmission component and the return spring, drives the moving contact to separate from or make contact with the stationary contact.

[0004] However, the above-mentioned type of changeover switch has the problem of a large number of parts, resulting in low assembly efficiency. There is an urgent need to propose a changeover switch to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this application is to provide a changeover switch that simplifies the structure and improves assembly efficiency.

[0006] This application provides a changeover switch, including a housing, a contact assembly, and a transmission component. The contact assembly includes a contact support slidably disposed on the housing, a stationary contact fixedly mounted on the housing, and a moving contact mounted on the contact support. The contact support is provided with a mounting hole.

[0007] The transmission component includes an integrally formed first lever arm, a rotating part, and a second lever arm. The first and second lever arms are spaced apart on the periphery of the rotating part, which is rotatably connected to the housing. The end of the second lever arm is provided with a connecting hook, which is movably connected to a hook hole.

[0008] In this process, the first lever arm is subjected to force to rotate the transmission component, while the second lever arm drives the contact to slide through the cooperation of the connecting hook and the hanging hole, thereby realizing the contact and separation of the moving contact and the stationary contact.

[0009] By installing a connecting hook at the end of the second lever arm of the transmission component, and using the hook to attach to the mounting hole on the contact support, the transmission component can either push against the contact support to bring the moving contact closer to and into contact with the stationary contact during rotation, or pull the contact support in the opposite direction to separate the moving contact from the stationary contact. This eliminates the need for a return spring in traditional solutions, effectively simplifying assembly operations and improving assembly efficiency while ensuring the normal switching function of the changeover switch.

[0010] In some examples, the connecting hook includes an integrally formed first extension and a second extension, the first extension being connected between the second extension and a second lever arm, and the second extension being parallel to the second lever arm.

[0011] This configuration creates a stable, narrowly shaped U-shaped mounting space between the second extension and the second lever arm. The contact support simply needs to be fitted onto the second extension through the mounting hole to connect the second lever arm to the contact support, simplifying installation. The contact support, mounted in this mounting space, is less likely to detach during the rotation of the second lever arm around the rotating part, thus improving the connection stability between the transmission component and the contact support.

[0012] In some examples, the second extension is provided with a first boss on the side near the second lever arm, and the second extension is inserted into the hook hole accordingly, with the first boss abutting against the wall of the hook hole.

[0013] The first boss can form a reliable force transmission path at the contact surface between the second extension section and the wall of the mounting hole, avoiding the situation where the second extension section and the wall of the mounting hole do not make contact or have unstable contact during the clockwise rotation of the second lever arm, which is conducive to the efficient transmission of the tripping driving force to the contact support.

[0014] In some examples, the second extension is also provided with a second boss, with the first boss and the second boss located on opposite sides of the second extension, and the second boss being able to abut against the wall of the mounting hole on the side away from the first boss.

[0015] The second boss is similar to the first boss in that it can form a reliable force transmission path with the contact surface of the hanging hole wall. However, the second boss can prevent unstable contact between the second extension section and the hanging hole wall during the counterclockwise rotation of the second lever arm, which is conducive to the efficient transmission of the closing driving force to the contact support.

[0016] In some examples, the top surfaces of the first and second bosses are both set as arc-shaped convex surfaces, the wall of the hanging hole is flat, and the first boss and the hanging hole, as well as the second boss and the hanging hole, maintain line-to-surface contact.

[0017] This design effectively reduces friction between the first boss and the wall of the hook-hook, and between the second boss and the wall of the hook-hook, facilitating smooth relative movement between the connecting hook and the hook-hook. Simultaneously, the arc-shaped boss complements the arc-shaped path of the connecting hook, ensuring that the first boss maintains line-to-surface contact with the wall of the hook-hook during clockwise rotation, and that the second boss maintains line-to-surface contact with the wall of the hook-hook during counter-clockwise rotation.

[0018] In some examples, the contact support has a clearance groove on the side near the second lever arm, which communicates with the mounting hole and is used to avoid the first extension section.

[0019] The clearance groove can avoid the first extension section as the connecting hook rotates with the second lever arm, and can also accommodate the first extension section when the changeover switch is in the closed state. This design can effectively save space inside the housing, and is conducive to optimizing the size of the changeover switch while facilitating assembly.

[0020] In some examples, the rotating part includes a shaft and a mounting groove provided on the shaft. The housing is provided with a shaft hole, the shaft is rotatably connected to the shaft hole, and an energy storage component is provided in the mounting groove. The energy storage component includes a first arm fixedly connected to the housing and a second arm fixedly connected to the rotating part. The first arm can drive the energy storage component to store energy when it is rotated by force.

[0021] By integrally forming a shaft on the rotating part and directly rotatably connecting it to the housing, the assembly structure between the transmission component and the housing is effectively simplified. Furthermore, by installing an energy storage component on the shaft, energy can be stored during the rotation of the transmission component, and the energy storage component can be used to drive the transmission component to rotate in the opposite direction when necessary. Simultaneously, the energy storage component can be installed on the transmission component first, and then the entire transmission component can be installed onto the housing, effectively simplifying the assembly operation and improving assembly efficiency.

[0022] In some examples, the distance from the end of the first lever arm to the rotation center of the rotating part is a, the distance from the end of the second lever arm to the rotation center of the rotating part is b, and the ratio range of the lever ratio of the transmission component is b:a is greater than or equal to 1.5 and less than or equal to 2.5.

[0023] This configuration allows the first lever arm to have only a small stroke when the changeover switch is activated in conjunction with the dual-coil electromagnetic switch. The second lever arm can then expand the contact support sliding distance, increasing the sliding distance of the contact support away from the stationary contact. This increased opening distance improves the reliability of the changeover switch's tripping and ensures that the dual-coil electromagnetic switch can achieve accurate and stable switching.

[0024] In some examples, the housing is provided with a guide rail, and the contact support is provided with a groove, with the guide rail and the groove being slidably connected.

[0025] The sliding fit of the guide rail and the slide groove can limit the sliding direction of the contact support, ensuring that the contact support always slides in the preset direction. The structure and fit of the guide rail and the slide groove are simple, easy to assemble, and require less space. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the internal structure of the changeover switch provided in an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the closed state of the changeover switch provided in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the open state of the changeover switch provided in an embodiment of this application.

[0030] Figure 4 An exploded view of the changeover switch provided in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the transmission component provided in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the structure for the transmission component and contact support cooperation provided in the embodiments of this application.

[0033] Figure 7 Provided for the embodiments of this application Figure 6 Cross-sectional view at point AA.

[0034] Figure 8 This is a schematic diagram of the contact support structure provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached drawings: 100, changeover switch; 1, housing; 11, shaft hole; 12, guide rail; 13, bottom shell; 14, cover plate; 2, contact assembly; 21, contact support; 211, mounting hole; 212, clearance groove; 213, slide groove; 22, stationary contact; 23, moving contact; 3, transmission component; 31, first lever arm; 32, rotating part; 321, shaft; 322, mounting groove; 33, second lever arm; 34, energy storage component; 341, first arm; 342, second arm; 35, connecting hook; 351, first extension section; 352, second extension section; 353, first boss; 354, second boss. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] Dual-coil electromagnetic switch devices typically include a changeover switch. After the dual-coil electromagnetic switch device is started, the changeover switch can disconnect the starting coil and turn on the holding coil to adapt to different operating states of the dual-coil electromagnetic switch device.

[0042] Existing changeover switches include a moving contact, a stationary contact, a contact support, a transmission component, and a return spring. The contact support needs to be activated by the opposing forces provided by the transmission component and the return spring to move the moving contact towards or away from the stationary contact. This type of changeover switch has a large number of parts, resulting in low assembly efficiency and hindering rapid production.

[0043] Based on this, the present application provides a changeover switch that simplifies the structure and improves assembly efficiency.

[0044] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0045] Please refer to Figures 1 to 4 This embodiment provides a changeover switch 100, including a housing 1, a contact assembly 2, and a transmission component 3. The contact assembly 2 includes a contact support 21 slidably disposed on the housing 1, a stationary contact 22 fixedly installed on the housing 1, and a moving contact 23 installed on the contact support 21. The contact support 21 is provided with a mounting hole 211.

[0046] The transmission component 3 includes an integrally formed first lever arm 31, a rotating part 32, and a second lever arm 33. The first lever arm 31 and the second lever arm 33 are spaced apart on the periphery of the rotating part 32, which is rotatably connected to the housing 1. The end of the second lever arm 33 is provided with a connecting hook 35, which is movably connected to the hook hole 211.

[0047] In this process, the first lever arm 31 is subjected to force, the transmission component 3 rotates, and the second lever arm 33 drives the contact support 21 to slide through the cooperation of the connecting hook 35 and the hanging hole 211, thereby realizing the contact and separation of the moving contact 23 and the stationary contact 22.

[0048] By providing a connecting hook 35 at the end of the second lever arm 33 of the transmission component 3, and using the connecting hook 35 to hook onto the hook hole 211 on the contact support 21, the transmission component 3 can, during rotation, either push against the contact support 21 to bring the moving contact 23 closer to and into contact with the stationary contact 22, or pull the contact support 21 in the opposite direction to separate the moving contact 23 from the stationary contact 22. This eliminates the need for a return spring in traditional solutions, effectively simplifying the assembly process and improving assembly efficiency while ensuring the normal switching function of the changeover switch 100.

[0049] Among them, reference Figure 1 The housing 1 serves as the main support for all components in the changeover switch 100. The housing 1 has a receiving cavity, in which the contact assembly 2 and the transmission component 3 are both installed.

[0050] The contact support 21 in the contact assembly 2 is used to mount the moving contact 23. After being driven, the contact support 21 slides in the housing 1. Its sliding direction is perpendicular to the contact surface of the stationary contact 22. The contact support 21 can drive the moving contact 23 to move together. When the contact support 21 slides towards the stationary contact 22, it can drive the moving contact 23 to approach the stationary contact 22 and eventually make contact with the stationary contact 22. When the contact support 21 slides away from the stationary contact 22, it can separate the moving contact 23 from the stationary contact 22 and move away from the stationary contact 22.

[0051] The transmission component 3 is rotatably connected to the housing 1 via a rotating part 32. The rotating part 32 can be an integrally formed shaft 321 that is directly inserted into a corresponding rotating shaft hole 11 on the housing 1; or the rotating part 32 can have a rotating shaft hole, and a corresponding shaft can be provided on the housing 1; or both the rotating part 32 and the housing 1 can be formed as rotating shaft holes, with a rotating shaft inserted between them. All three types of rotatable connection are characterized by simple structure and ease of assembly.

[0052] Reference Figures 2 to 4 The first lever arm 31 and the second lever arm 33 of the transmission component 3 are spaced apart and arranged around the circumference of the rotating part 32. This allows the transmission component 3 to form a lever-like structure. When the first lever arm 31 is subjected to force, it drives the second lever arm 33, which in turn drives the contact support 21 to slide. Furthermore, the leverage ratio of the transmission component 3 can be designed so that the end of the first lever arm 31 only needs to move a small distance, while the contact support 21 connected to the end of the second lever arm 33 can move a large distance. The specific leverage ratio will be described below and will not be elaborated here.

[0053] Among them, the first lever arm 31 of the transmission component 3 extends out of the housing 1. The first lever arm 31 extending out of the housing 1 can be subjected to the force applied by the starting action of the double coil electromagnetic switch device. Under this force, the transmission component 3 will rotate clockwise. During the clockwise rotation of the second lever arm 33 with the rotating part 32, it can pull the contact support 21 to slide away from the stationary contact 22 through the cooperation of the connecting hook 35 and the hanging hole 211, thereby making the moving contact 23 move away from the stationary contact 22, and realizing the disconnection of the changeover switch 100.

[0054] When the dual-coil electromagnetic switch device is started, the first lever arm 31 can be subjected to a force in the opposite direction to that provided during the start-up process to drive the transmission component 3 to rotate counterclockwise. During the counterclockwise rotation of the second lever arm 33 with the rotating part 32, it can push the contact support 21 to slide towards the stationary contact 22 through the cooperation of the connecting hook 35 and the hanging hole 211, thereby making the moving contact 23 approach the stationary contact 22 and realizing the closing of the changeover switch 100.

[0055] The connecting hook 35 maintains a clearance fit with the wall of the hanging hole 211 in the hanging hole 211. This prevents jamming between the connecting hook 35 and the hanging hole 211 during the rotation of the second lever arm 33. It also improves the stability of the relative motion between the connecting hook 35 and the wall of the hanging hole 211 while facilitating contact and force application, thereby improving the reliability of the changeover switch 100.

[0056] Reference Figure 5 and Figure 6In some examples, the connecting hook 35 includes an integrally formed first extension 351 and a second extension 352, the first extension 351 being connected between the second extension 352 and the second lever arm 33, and the second extension 352 being parallel to the second lever arm 33.

[0057] This arrangement creates a stable, U-shaped mounting space with a small opening between the second extension section 352 and the second lever arm 33. The contact support 21 only needs to be fitted onto the second extension section 352 through the mounting hole 211 to connect the second lever arm 33 to the contact support 21, simplifying installation. The contact support 21, mounted in this mounting space, is less likely to detach during the rotation of the second lever arm 33 around the rotating part 32, thus improving the connection stability between the transmission component 3 and the contact support 21.

[0058] Reference Figure 5 The first extension segment 351 serves as a transition section, with one end connected to the second lever arm 33 and the other end connected to the second extension segment 352. The second extension segment 352 is configured to remain parallel to the second lever arm 33, thus forming a U-shaped hooking space between the second lever arm 33, the first extension segment 351, and the second extension segment 352. After the hooking hole 211 of the contact support 21 is fitted onto the second extension segment 352, the portion of the contact support 21 near the second lever arm 33 is situated within this U-shaped hooking space. This U-shaped hooking space design ensures a stable connection with the contact support 21 even when the second lever arm 33 rotates around the rotating part 32 and the moving path of the connecting hook 35 is arc-shaped, preventing detachment and providing high stability.

[0059] The length of the second extension 352 can be set to be greater than or equal to the depth of the hook hole 211. This ensures that at least part of the second extension 352 abuts against the wall of the hook hole 211 when the connecting hook 35 moves away from the stationary contact 22, which is beneficial for stable hooking.

[0060] Reference Figures 5 to 7 In some examples, the second extension 352 is provided with a first boss 353 on the side near the second lever arm 33, and the second extension 352 is inserted into the hook hole 211, and the first boss 353 can abut against the wall of the hook hole 211.

[0061] The first boss 353 can form a reliable force transmission path at the contact surface between the second extension section 352 and the wall of the mounting hole 211, avoiding the situation where the second extension section 352 and the wall of the mounting hole 211 do not make contact or the contact is unstable during the clockwise rotation of the second lever arm 33, which is conducive to the efficient transmission of the tripping driving force to the contact support 21.

[0062] The first protrusion 353 is located on the side of the second extension 352 near the second lever arm 33. When the second lever arm 33 rotates clockwise, the first protrusion 353 can abut against the wall of the hanging hole 211 opposite to the first protrusion 353. Compared with the form in which the second extension 352 directly contacts the wall of the hanging hole 211, the first protrusion 353 can shorten the distance between the second extension 352 and the wall of the hole. Without affecting the relative movement of the second extension 352 in the hanging hole 211, it is convenient for the second extension 352 to apply force to the hanging hole 211.

[0063] The first boss 353 can be configured as a square boss, a circular boss, or a triangular boss, etc.

[0064] Reference Figures 5 to 7 In some examples, the second extension 352 is also provided with a second boss 354, the first boss 353 and the second boss 354 are located on opposite sides of the second extension 352, and the second boss 354 can abut against the wall of the hook hole 211 on the side away from the first boss 353.

[0065] The second boss 354 is similar to the first boss 353 in that it can form a reliable force transmission path with the contact surface of the hanging hole 211. However, the second boss 354 can prevent unstable contact between the second extension section 352 and the hanging hole 211 during the counterclockwise rotation of the second lever arm 33, which is conducive to the efficient transmission of the closing driving force to the contact support 21.

[0066] The second protrusion 354 and the first protrusion 353 are located on opposite sides of the second extension 352. When the second lever arm 33 rotates counterclockwise, the second protrusion 354 can abut against the wall of the mounting hole 211 opposite to the second protrusion 354. Compared with the form in which the second extension 352 directly abuts against the wall of the mounting hole 211, the second protrusion 354 can shorten the distance between the second extension 352 and the wall of the hole. Without affecting the relative movement of the second extension 352 in the mounting hole 211, it is convenient for the second extension 352 to push the contact support 21 to move closer to the stationary contact 22.

[0067] Similarly, the second boss 354 can also be configured as a square boss, a round boss, or a triangular boss, etc.

[0068] Reference Figure 7 In some examples, the top surface of the first boss 353 and the top surface of the second boss 354 are both set as arc-shaped convex surfaces, and the wall of the hanging hole 211 is flat. The first boss 353 and the hanging hole 211, and the second boss 354 and the hanging hole 211 are all in line-to-surface contact.

[0069] This arrangement effectively reduces the friction between the first boss 353 and the wall of the hook hole 211, and between the second boss 354 and the wall of the hook hole 211, which facilitates smooth relative movement between the connecting hook 35 and the hook hole 211. Simultaneously, the arc-shaped bosses complement the arc-shaped path of the connecting hook 35, ensuring that the first boss 353 maintains line-to-surface contact with the wall of the hook hole 211 when the connecting hook 35 rotates clockwise, and that the second boss 354 maintains line-to-surface contact with the wall of the hook hole 211 when the connecting hook 35 rotates counterclockwise.

[0070] Specifically, the top surface of the first protrusion 353 faces the wall of the hole 211 opposite to the first protrusion 353. When the connecting hook 35 rotates clockwise around the rotating part 32 with the second lever arm 33, the first protrusion 353 abuts against the hole wall, and relative sliding occurs between the first protrusion 353 and the hole wall during the continuous rotation of the connecting hook 35. The arc-shaped convex surface and the plane always maintain line-to-surface contact, which has less friction than surface-to-surface contact and higher stability than point-to-surface contact. The second protrusion 354 has the same technical effect, which will not be described in detail here.

[0071] Reference Figure 7 and Figure 8 In some examples, the contact support 21 is provided with a relief groove 212 on the side near the second lever arm 33. The relief groove 212 is connected to the mounting hole 211 and is used to avoid the first extension section 351.

[0072] The clearance groove 212 can avoid the first extension section 351 during the rotation of the connecting hook 35 with the second lever arm 33, and can also accommodate the first extension section 351 when the changeover switch 100 is in the closed state. This design can effectively save space in the housing 1, and is conducive to optimizing the volume of the changeover switch 100 while facilitating assembly.

[0073] The clearance groove 212 is disposed on the side of the contact support 21 near the second lever arm 33, and the clearance groove 212 is located on the side of the contact support 21 near the first extension section 351. The shape of the clearance groove 212 corresponds to the shape of the first extension section 351, and the width of the clearance groove 212 is 0.5mm to 1mm wider than the width of the first extension section 351, which facilitates the accommodation and clearance of the first extension section 351, while ensuring sufficient movement clearance.

[0074] Reference Figure 5 and Figure 6In some examples, the rotating part 32 includes a shaft 321 and a mounting groove 322 provided in the shaft 321. The housing 1 is provided with a rotating shaft hole 11. The shaft 321 is rotatably connected to the rotating shaft hole 11. An energy storage component 34 is provided in the mounting groove 322. The energy storage component 34 includes a first arm 341 fixedly connected to the housing 1 and a second arm 342 fixedly connected to the rotating part 32. The first arm 31 can drive the energy storage component 34 to store energy when it is rotated by force.

[0075] By integrally forming a shaft 321 on the rotating part 32 and directly rotatably connecting it to the housing 1, the assembly structure between the transmission component 3 and the housing 1 is effectively simplified. Furthermore, by installing an energy storage component 34 on the shaft 321, energy can be stored during the rotation of the transmission component 3, and the transmission component 3 can be driven to rotate in the opposite direction when necessary. Simultaneously, the energy storage component 34 can be installed on the transmission component 3 before the entire transmission component 3 is installed onto the housing 1, effectively simplifying the assembly operation and improving assembly efficiency.

[0076] The housing 1 includes a bottom shell 13 and a cover plate 14, as shown in the figure. Figure 1 The rotating shaft hole 11 is provided on the bottom shell 13. The shaft 321 is provided on the side of the rotating part 32 near the bottom shell 13. The shaft 321 is a cylindrical protrusion provided on the surface of the transmission component 3. The height of the cylindrical protrusion is the same as the depth of the rotating shaft hole 11, and the diameter of the shaft 321 matches that of the rotating shaft hole 11. The rotating connection between the transmission component 3 and the bottom shell 13 can be achieved by directly inserting the shaft 321 into the rotating shaft hole 11. This rotating fit structure is simple in structure and easy to install.

[0077] The mounting groove 322 is located on the side of the rotating part 32 near the cover plate 14. The mounting groove 322 is an annular groove, and the axis of the mounting groove 322 is the same as that of the shaft 321. The energy storage component 34 is installed in the mounting groove 322. In this embodiment, the energy storage component 34 is set as a torsion spring, which is sleeved in the annular mounting groove 322. During assembly, the torsion spring can be installed into the mounting groove 322 first, and then the transmission component 3 can be installed as a whole onto the bottom shell 13, which helps to improve the assembly speed.

[0078] The extension direction of the first arm 341 of the torsion spring is the same as that of the first lever arm 31, and the extension direction of the second arm 342 is opposite to that of the first lever arm 31. The first arm 341 is fixedly connected to the housing 1, and the second arm 342 is fixedly connected to the second lever arm 33. This allows the first arm 341 to remain stationary while the second arm 342 rotates relative to the first arm 341 to store energy in the torsion spring when the transmission component 3 rotates clockwise relative to the bottom housing 13.

[0079] When the force applied to the first lever arm 31 disappears, the torsion spring releases energy instantly, the first arm 341 remains fixed, and the second arm 342 drives the second lever arm 33 to rotate counterclockwise, quickly pushing the contact support 21 to slide towards the stationary contact 22, so as to realize the rapid closing of the changeover switch 100.

[0080] The energy storage component 34 can also be configured as an elastic structural component such as a helical spring, tension spring, or torsion spring.

[0081] Reference Figure 7 In some examples, the distance from the end of the first lever arm 31 to the rotation center of the rotating part 32 is a, the distance from the end of the second lever arm 33 to the rotation center of the rotating part 32 is b, and the lever ratio of the transmission member 3 is in the range of b:a is greater than or equal to 1.5 and less than or equal to 2.5.

[0082] This configuration allows the first lever arm 31 to only require a small stroke when the changeover switch 100 operates in conjunction with the dual-coil electromagnetic switch device. The second lever arm 33 can then expand the sliding distance of the contact support 21. The sliding distance of the contact support 21 increases in the direction away from the stationary contact 22, i.e., the opening distance increases. This improves the reliability of the changeover switch 100's breaking action, thereby ensuring that the dual-coil electromagnetic switch device can achieve accurate and stable switching.

[0083] The distance from the end of the first lever arm 31 to the rotation center of the rotating part 32 is defined as a, and the distance from the end of the second lever arm 33 to the rotation center of the rotating part 32 is defined as b. The rotating part 32 serves as the fulcrum of the transmission member 3, thus making the transmission member 3 form a lever-like structure.

[0084] A connecting hook 35 is disposed at the end of the second lever arm 33 and connected to the contact support 21. When the first lever arm 31 is subjected to force and rotates around the fulcrum, the second lever arm 33 drives the contact support 21 to slide through the connecting hook 35. In this embodiment, the ratio of b:a is between 1.5 and 2.5 (inclusive). Within this ratio range, the transmission component 3 can accurately adapt the relationship between the driving force and the opening distance, so that while the force on the first lever arm 31 remains unchanged, the opening distance between the moving contact 23 and the stationary contact 22 is increased, ensuring that the moving contact 23 and the stationary contact 22 can reliably break.

[0085] In one alternative embodiment, the ratio of b:a can be 1.75, 2.0, or 2.25, etc. When b:a is less than 1.5, there may be insufficient driving force, resulting in poor contact between the moving contact 23 and the stationary contact 22, or a small gap between the moving contact 23 and the stationary contact 22. When b:a is greater than 2.5, although the gap increases, the driving force applied to the first lever arm 31 needs to be significantly increased. The range of 1.5-2.5 is exactly the optimal balance point for various performance aspects.

[0086] Reference Figure 4 and Figure 8 In some examples, the housing 1 is provided with a guide rail 12, and the contact support 21 is provided with a groove 213, with the guide rail 12 and the groove 213 slidably connected.

[0087] The sliding fit of the guide rail 12 and the slide groove 213 can limit the sliding direction of the contact support 21, ensuring that the contact support 21 always slides in the preset direction. The structure and fit of the guide rail 12 and the slide groove 213 are simple, easy to assemble, and require less space.

[0088] The guide rail 12 is mounted on the base shell 13, and the slide groove 213 is formed on the contact support 21 along the sliding direction of the contact support 21. During assembly, the guide rail 12 is simply aligned with the slide groove 213 and inserted to achieve a sliding connection between the two. The guide rail 12 and the slide groove 213 can be interchanged, that is, the guide rail 12 is mounted on the contact support 21, and the slide groove 213 is mounted on the base shell 13, achieving the same technical effect.

[0089] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A changeover switch, characterised in that, include: case; The contact assembly includes a contact support slidably disposed on the housing, a stationary contact fixedly installed on the housing, and a movable contact installed on the contact support, wherein the contact support is provided with a mounting hole; A transmission component includes an integrally formed first lever arm, a rotating part, and a second lever arm. The first lever arm and the second lever arm are spaced apart on the periphery of the rotating part, and the rotating part is rotatably connected to the housing. The end of the second lever arm is provided with a connecting hook, which is movably connected to the hook hole; In this configuration, the first lever arm is subjected to force to rotate the transmission component, while the second lever arm, through the cooperation of the connecting hook and the hooking hole, drives the contact to support sliding, thereby realizing the contact and separation of the moving contact and the stationary contact.

2. The switch according to claim 1, characterized in that The connecting hook includes an integrally formed first extension section and a second extension section, the first extension section being connected between the second extension section and the second lever arm, and the second extension section being parallel to the second lever arm.

3. The switch according to claim 2, characterized in that The second extension section has a first protrusion on the side near the second lever arm. The second extension section is inserted into the hook hole, and the first protrusion can abut against the wall of the hook hole.

4. The switch according to claim 3, characterized in that The second extension section is also provided with a second boss. The first boss and the second boss are located on opposite sides of the second extension section. The second boss can abut against the hole wall on the side of the hook hole away from the first boss.

5. The switch according to claim 4, characterized in that The top surfaces of the first boss and the second boss are both set as arc-shaped convex surfaces, and the wall of the hanging hole is flat. The first boss and the hanging hole, and the second boss and the hanging hole are all in line-surface contact.

6. The switch according to claim 2, characterized in that The contact support has a clearance groove on the side near the second lever arm. The clearance groove is connected to the hook hole and is used to avoid the first extension section.

7. The switch according to any of claims 1-6, characterized in that The rotating part includes a shaft and a mounting groove provided on the shaft. The housing is provided with a pivot hole. The shaft is rotatably connected to the pivot hole. An energy storage component is provided in the mounting groove. The energy storage component includes a first arm fixedly connected to the housing and a second arm fixedly connected to the rotating part. The first arm can drive the energy storage component to store energy when it is rotated under force.

8. The switch according to any of claims 1-6, characterized in that The distance from the end of the first lever arm to the rotation center of the rotating part is a, the distance from the end of the second lever arm to the rotation center of the rotating part is b, and the ratio range of the lever ratio of the transmission component is b:a is greater than or equal to 1.5 and less than or equal to 2.

5.

9. The switch according to claim 1, characterized in that The housing is provided with a guide rail, and the contact support is provided with a sliding groove. The guide rail and the sliding groove are slidably connected.

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