Change-over switch

Abstract

The utility model discloses a change-over switch, which relates to the technical field of electrical switches and comprises a shell, a contact support, a static contact, a contact bridge and a rocker arm. The contact support is installed on the shell in a sliding mode in the axial direction, and the contact support is provided with a linkage hole. The static contact is fixedly installed on the housing. The contact bridge is movably installed on the contact support. The rocker arm 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 linkage column is arranged at the tail end of the second force arm and rotationally connected to the linkage hole. The first force arm is stressed to enable the rocker arm to rotate, and the second force arm drives the contact support to slide through the cooperation of the linkage column and the linkage hole, thereby achieving the contact and separation of the contact bridge and the static contact. 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] A dual-coil contactor has two coils: a starting coil for engaging and a holding coil for retaining. After engaging, the contactor needs to use a changeover switch to disconnect the starting coil and connect the holding coil to optimize energy consumption and improve reliability.

[0003] Existing changeover switches include a transmission component, a moving contact, a stationary contact, a contact support, and a return spring. The transmission component is used to transmit the action to the contact support, which drives the moving contact to contact the stationary contact. The return spring is used to reverse the drive of the contact support to separate the moving contact from the stationary contact.

[0004] Existing changeover switches have a large number of parts, making rapid assembly difficult. Therefore, there is an urgent need to propose a new 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 support, a stationary contact, a contact bridge, and a rocker arm. The contact support is slidably mounted on the housing along the axial direction and has a linkage hole. The stationary contact is fixedly mounted on the housing. The contact bridge is movably mounted on the contact support.

[0007] The rocker arm 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 linkage post, which is rotatably connected to a linkage hole.

[0008] The first lever arm is subjected to force to rotate the rocker arm, and the second lever arm drives the contact to slide through the cooperation of the linkage column and the linkage hole, so as to realize the contact and separation of the contact bridge and the stationary contact.

[0009] By setting a linkage column on the second lever arm and a linkage hole on the contact support, and using a connection method where the linkage column is inserted into the linkage hole, the contact support can be moved closer to or further away from the stationary contact during the rotation of the rocker arm, depending on the rotation direction of the rocker arm. This eliminates the need for a separate return spring to drive the contact support, simplifying the structure and assembly operation, and improving assembly efficiency.

[0010] In some examples, during the rotation of the second lever arm around the rotating part, the linkage column applies a combined force to the wall of the linkage hole. The combined force is decomposed into a first component force along the contact support sliding direction and a second component force having a preset angle α with the first component force.

[0011] The first component force drives the contact support to slide axially to achieve contact or separation between the contact bridge and the stationary contact. The second component force is used to cause the contact support to shift radially. The radial shift of the contact support enables the contact bridge and the stationary contact in the contact state to generate relative sliding friction to remove impurities from the contact surface.

[0012] With the structural cooperation of the linkage column and linkage hole, the combined force applied by the second lever arm to the contact support can not only push the contact support to slide until the contact bridge contacts the stationary contact, but also cause the contact support to shift radially during the sliding process. As the contact bridge shifts with the contact support, the contact points on the contact bridge rub against the stationary contact to remove impurities at the contact position. This configuration can achieve the above functions without the need for additional parts or structures, and effectively improves the stability of the changeover switch without affecting assembly efficiency.

[0013] In some examples, the included angle α is preset to be greater than 0° and less than 90°.

[0014] By designing the preset angle α between the first and second components of the force within this range, it can be ensured that the contact support obtains sufficient linear motion driving force when sliding along the axial direction, reliably completing the basic contact function between the contact bridge and the stationary contact. At the same time, it can also allow the contact support to undergo appropriate radial offset, accurately realizing moderate frictional sliding between the contact bridge and the stationary contact. This simplifies the structure while effectively improving the stability of the changeover switch.

[0015] In some examples, the housing is provided with a guide rail and the contact support is provided with a groove. The guide rail and the groove are slidably connected, and the guide rail and the groove are fitted with a clearance that is adapted to the radially offset distance of the contact support.

[0016] The contact support utilizes a sliding fit of guide rails and grooves on the housing. This restricts the sliding direction of the contact support, ensuring it always slides along a preset direction. The structure and fit of the guide rails and grooves are simple, facilitating assembly and requiring minimal space. Furthermore, the clearance fit between the guide rails and grooves provides radial offset space for the contact support without compromising stable sliding, accommodating the radial offset force applied to the contact support by the rocker arm.

[0017] In some examples, the contact support has a mounting hole with guide ribs on the hole wall, the contact bridge passes through the mounting hole, the contact bridge has a guide groove, and the contact bridge is slidably connected to the guide ribs through the guide groove.

[0018] By setting guide ribs in the mounting hole, the contact bridge is slidably connected in the mounting hole through the cooperation of the guide groove and the guide ribs. The guide ribs can be used to guide the movement of the contact bridge, so that when the contact bridge slides towards the stationary contact along the contact support, the contact bridge can slide relative to the stationary contact along the guide ribs, further enhancing the effect of removing impurities between the contact bridge and the stationary contact.

[0019] In some examples, the guide rib includes a first segment and a second segment connected together. The first segment extends in the same direction as the sliding direction supported by the contact, and the second segment bends based on the first segment. The contact bridge can slide relative to the stationary contact when it moves from the first segment to the second segment.

[0020] Dividing the guide rib into a straight first section and a bent second section allows the contact bridge to maintain a straight sliding motion when it first begins to slide with the contact support. The contact bridge only shifts and slides when it is about to contact the stationary contact and when it makes contact with the stationary contact. This can improve the removal of relative sliding friction between the contact bridge and the stationary contact in a small space.

[0021] In some examples, the distance from the end of the first lever arm to the center of rotation of the rotating part is a, the distance from the end of the second lever arm to the center of rotation of the rotating part is b, and the lever ratio of the rocker arm is in the range of b:a greater than or equal to 1.5 and less than or equal to 2.

[0022] By designing the lever ratio of the rocker arm within this range, while ensuring accurate driving of the contact bridge to contact or separate from the stationary contact, the first lever arm only needs a small stroke to increase the contact support sliding distance through the second lever arm. The increased sliding distance of the contact support away from the stationary contact, i.e., the increased opening distance, can improve the reliability of the changeover switch disconnection, thereby ensuring that the dual coil contactor can achieve accurate and stable switching.

[0023] In some examples, the rotating part includes a shaft and a mounting groove provided on the shaft. The housing has a shaft hole, the shaft is rotatably connected to the shaft hole, and a torsion spring is installed in the mounting groove. The torsion spring includes a first torsion arm fixedly connected to the housing and a second torsion arm fixedly connected to the rotating part. The first torsion arm is subjected to force to rotate the rotating part and compress the torsion spring.

[0024] By integrally molding a shaft onto the rotating part and directly rotatably connecting it to the housing, the assembly structure between the rocker arm and the housing is effectively simplified. Furthermore, by installing a torsion spring on the shaft, energy can be stored during rocker arm rotation, and the rocker arm can be driven to rotate in the opposite direction when necessary. Simultaneously, the torsion spring can be installed on the rocker arm first, and then the entire rocker arm can be installed onto the housing, effectively simplifying the assembly operation and improving assembly efficiency. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the internal structure of the changeover switch provided in an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the closed state of the changeover switch provided in an embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the open state of the changeover switch provided in an embodiment of this application.

[0029] Figure 4 An exploded view of the changeover switch provided in an embodiment of this application.

[0030] Figure 5 This is an analysis diagram showing the force exerted by the rocker arm on the contacts during the closing process, as provided in an embodiment of this application.

[0031] Figure 6 An analysis diagram showing the force applied by the rocker arm to the contacts during the opening process, provided in an embodiment of this application.

[0032] Figure 7 This is a schematic diagram of the contact support structure provided in an embodiment of this application.

[0033] Figure 8 Provided for the embodiments of this application Figure 7 Cross-sectional view at point AA.

[0034] Figure 9 This is a schematic diagram of the rocker arm 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 support; 21, linkage hole; 22, slide groove; 23, mounting hole; 24, guide rib; 241, first section; 242, second section; 3, stationary contact; 4, contact bridge; 41, guide groove; 5, rocker arm; 51, first lever arm; 52, rotating part; 521, shaft; 522, mounting groove; 53, second lever arm; 54, torsion spring; 541, first torsion arm; 542, second torsion arm; 55, linkage column; F, combined force; F1, first component force; F2, second component force. 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] In a dual-coil contactor, one coil is the starting coil for starting, and the other is the holding coil for maintaining the energized state. After the dual-coil contactor has completed the start-up process, the switching coil needs to be switched from the starting coil to the holding coil by opening a changeover switch.

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

[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 support 2, a stationary contact 3, a contact bridge 4, and a rocker arm 5. The contact support 2 is slidably mounted on the housing 1 along the axial direction, and the contact support 2 is provided with a linkage hole 21. The stationary contact 3 is fixedly mounted on the housing 1. The contact bridge 4 is movably mounted on the contact support 2.

[0046] The rocker arm 5 includes an integrally formed first lever arm 51, a rotating part 52, and a second lever arm 53. The first lever arm 51 and the second lever arm 53 are spaced apart on the periphery of the rotating part 52, which is rotatably connected to the housing 1. The end of the second lever arm 53 is provided with a linkage post 55, which is rotatably connected to the linkage hole 21.

[0047] The first lever arm 51 is subjected to force to rotate the rocker arm 5, and the second lever arm 53 drives the contact support 2 to slide through the cooperation of the linkage column 55 and the linkage hole 21, so as to realize the contact bridge 4 and the stationary contact 3 to contact and separate.

[0048] By setting a linkage column 55 on the second lever arm 53 and a linkage hole 21 on the contact support 2, and using the connection form of the linkage column 55 being inserted into the linkage hole 21, the contact support 2 can be moved closer to or further away from the stationary contact 3 according to the rotation direction of the rocker arm 5 during the rotation of the rocker arm 5. There is no need to set a separate return spring to drive the contact support 2, which simplifies the structure and assembly operation and helps to improve assembly efficiency.

[0049] 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 support 2, stationary contact 3, contact bridge 4, and rocker arm 5 are all installed. Among them, the stationary contact 3 is fixedly installed in the receiving cavity.

[0050] The contact support 2 is slidably mounted in the receiving cavity along an axial direction. The central axis of the contact support 2 is perpendicular to the contact surface of the stationary contact 3. When the contact support 2 is driven, it slides along this axial direction to move closer to or away from the stationary contact 3. Contact bridge 4 has contact points at both ends and is movably mounted on the contact support 2. When the contact support 2 moves closer to the stationary contact 3, the contact bridge 4 moves closer to the stationary contact 3 along with the contact support 2 and contacts the stationary contact 3 through its contact points. When the contact support 2 moves away from the stationary contact 3, the contact points of the contact bridge 4 separate from the stationary contact 3.

[0051] Reference Figure 4 The rocker arm 5 adopts a one-piece molding design, which is convenient for assembly and structurally stable. The rocker arm 5 is rotatably connected to the housing 1 via a rotating part 52. The rotating part 52 can be a one-piece molded shaft that can be directly inserted into the corresponding shaft hole 11 on the housing 1. Alternatively, the rotating part 52 can have a shaft hole, and a corresponding shaft can be provided on the housing 1. Another option is to have shaft holes on both the rotating part 52 and the housing 1, and insert a pin into both shaft holes. All three designs feature simple structure and facilitate quick assembly.

[0052] The first lever arm 51 and the second lever arm 53 of the rocker arm 5 are distributed at intervals around the rotating part 52, so that the rocker arm 5 can be a lever-like structure. When the first lever arm 51 is subjected to force, the entire rocker arm 5 will rotate based on the rotating part 52. At this time, the second lever arm 53 drives the contact support 2 to move during the rotation.

[0053] Specifically, the first lever arm 51 extends out of the housing 1. This extended lever arm 51 is subject to the force applied by the starting action of the dual-coil contactor. Under this force, the rocker arm 5 rotates clockwise. During this rotation, the second lever arm 53 moves away from the stationary contact 3, thus driving the contact support 2 away from the stationary contact 3 through the cooperation of the linkage column 55 and the linkage hole 21. The first lever arm 51 can also be subject to the reaction force applied by the dual-coil contactor. Under this reaction force, the rocker arm 5 rotates counterclockwise, and during this process, the second lever arm 53 drives the contact support 2 closer to the stationary contact 3.

[0054] Furthermore, refer to Figure 4 The second lever arm 53 is connected to the linkage hole 21 on the contact support 2 via the linkage post 55. During rotation, the second lever arm 53 pushes the contact support 2 to slide by abutting against the wall of the linkage hole 21 through the linkage post 55. The use of the linkage post 55 and the linkage hole 21 facilitates quick assembly; simply align and insert them.

[0055] In addition, during the rotation of the second lever arm 53, the linkage column 55 and the linkage hole 21 can rotate relative to each other. This facilitates the dynamic adjustment of the contact position between the linkage column 55 and the linkage hole 21, so as to convert the rotation action of the second lever arm 53 into the sliding action of the contact support 2, thereby improving the reliability of the cooperation between the rocker arm 5 and the contact support 2.

[0056] In an alternative embodiment, the end of the second lever arm 53 can be configured as a linkage hole, and the contact support 2 can be configured as a linkage post 55. This configuration after the structural change has the same technical effect as the aforementioned embodiment, and will not be described again here.

[0057] Reference Figure 5 and Figure 6 In some examples, during the rotation of the second lever arm 53 around the rotating part 52, the linkage column 55 applies a composite force F to the wall of the linkage hole 21. The composite force F is decomposed into a first component force F1 along the sliding direction of the contact support 2, and a second component force F2 with a preset angle α with the first component force F1.

[0058] The first component force F1 drives the contact support 2 to slide axially to achieve contact or separation between the contact bridge 4 and the stationary contact 3. The second component force F2 is used to cause the contact support 2 to produce radial displacement. The radial displacement of the contact support 2 enables the contact bridge 4 and the stationary contact 3 in the contact state to produce relative sliding friction to remove impurities from the contact surface.

[0059] With the structural cooperation of the linkage column 55 and the linkage hole 21, the combined force F applied by the second lever arm 53 to the contact support 2 can not only push the contact support 2 to slide until the contact bridge 4 contacts the stationary contact 3, but also cause the contact support 2 to shift radially during the sliding process. During the shifting process with the contact support 2, the contact points on the contact bridge 4 rub against the stationary contact 3 to remove impurities at the contact position. This configuration can achieve the above functions without the need for additional parts or structures, and effectively improves the stability of the changeover switch 100 without affecting the assembly efficiency.

[0060] Specifically, during the rotation of the second lever arm 53, the movement path of the linkage column 55 is an arc, while the contact support 2 moves in a straight line. The linkage column 55 is inserted into the linkage hole 21. In this case, the movement of the linkage column 55 will apply a combined force F to the linkage hole 21 at a certain angle to the sliding direction of the contact support 2.

[0061] Reference Figure 5During the counterclockwise rotation of the rocker arm 5, the first component F1 of the compound force F is responsible for driving the contact support 2 to slide towards the stationary contact 3. The second component F2 will cause the end of the contact support 2 near the second lever arm 53 to shift downward. With a fulcrum in the middle, the end near the stationary contact 3 will shift upward, so that the contact on the contact bridge 4 slides upward relative to the stationary contact 3 and rubs against the stationary contact 3. This ensures that when the contact bridge 4 and the stationary contact 3 are in contact, impurities at the contact area can be removed, ensuring that the two are in close contact and maintaining a stable contact resistance.

[0062] Reference Figure 6 During the clockwise rotation of the rocker arm 5, the first component F1 of the compound force F is responsible for driving the contact support 2 to slide away from the stationary contact 3. At this time, the second component F2 will still cause the contact support 2 to deflect, but it will not affect the breaking capacity of the contact bridge 4 and the stationary contact 3.

[0063] In addition, the movement path of the linkage column 55 is similar in length to that of the contact support 2. When the linkage column 55 pushes the contact support 2 to slide to the critical position where the contact bridge 4 and the stationary contact 3 are in contact, the effect of the second component force F2 is most significant. This design can ensure that the sliding friction between the contact bridge 4 and the stationary contact 3 can remove impurities without causing excessive wear at the contact position.

[0064] Reference Figure 5 and Figure 6 In some examples, the preset included angle α is greater than 0° and less than 90°.

[0065] By designing the preset included angle α between the first component force F1 and the second component force F2 within this range, it can be ensured that the contact support 2 obtains sufficient linear motion driving force when sliding along the axial direction, so as to reliably complete the basic contact function between the contact bridge 4 and the stationary contact 3. At the same time, it can also make the contact support 2 undergo appropriate radial offset, so as to accurately realize the appropriate frictional sliding between the contact bridge 4 and the stationary contact 3. While simplifying the structure, it effectively improves the stability of the changeover switch 100.

[0066] In this embodiment, refer to Figure 5 During the process of rocker arm 5 pushing contact support 2 closer to stationary contact 3, the combined force F is directed downwards and to the right. The direction of the first component force F1 is the same as the sliding direction of contact support 2 towards stationary contact 3, and the second component force F2, according to the parallelogram law, is set at an acute angle to the first component force F1. (Refer to...) Figure 6 As the rocker arm 5 moves the contact support 2 away from the stationary contact 3, the combined force F is directed to the lower left. At this time, the direction of the first component force F1 is the same as the sliding direction of the contact support 2 away from the stationary contact 3, while the second component force F2 is also set at an acute angle to the first component force F1.

[0067] In terms of engineering reliability, this angle range provides ample design margin. Designers can select the optimal angle between 0° and 90°, such as 30°, 45°, or 60°, depending on the specific application scenario. Smaller angles emphasize enhanced axial drive force, suitable for applications requiring high contact pressure. Larger angles enhance radial cleaning effects, suitable for environments prone to contamination. This flexibility allows the changeover switch 100 to adapt to different load characteristics and operating environments.

[0068] From the perspective of mechanism durability, limiting the angle to this range can avoid the adverse effects of extreme working conditions. A completely 0° angle would result in pure axial thrust, losing the self-cleaning function. On the other hand, a 90° angle would subject the mechanism to full lateral force, accelerating the wear of guide rail 12. The reasonable setting of the intermediate value achieves functional integration while ensuring the balanced force on each component.

[0069] Reference Figure 6 and Figure 7 In some examples, the housing 1 is provided with a guide rail 12, and the contact support 2 is provided with a slide groove 22. The guide rail 12 and the slide groove 22 are slidably connected, and the guide rail 12 and the slide groove 22 are clearance-fitted, and the clearance is adapted to the radial offset distance of the contact support 2.

[0070] The contact support 2 adopts a sliding fit between the guide rail 12 and the slide groove 22 on the housing 1. This can limit the sliding direction of the contact support 2, ensuring that the contact support 2 always slides in a preset direction. The structure and fit of the guide rail 12 and the slide groove 22 are simple, easy to assemble, and require less space. At the same time, the guide rail 12 and the slide groove 22 adopt a clearance fit, which can provide radial offset space for the contact support 2 without affecting the stable sliding fit, so as to cooperate with the radial offset force applied to the contact support 2 by the rocker arm 5.

[0071] Reference Figure 6 The guide rail 12 is mounted on the housing 1, and the stationary contact 3 is mounted at the end of the guide rail 12, with the contact surface of the stationary contact 3 perpendicular to the guide rail 12. A sliding groove 22 is formed along the length of the contact support 2, and the length direction of the contact support 2 is the same as its sliding direction. During assembly, simply aligning the guide rail 12 with the sliding groove 22 and inserting it achieves a sliding connection between the two. In an optional embodiment, the guide rail 12 and the sliding groove 22 can be interchanged, i.e., the guide rail 12 is mounted on the contact support 2, and the sliding groove 22 is mounted on the housing 1, achieving the same technical effect.

[0072] The guide rail 12 and the slide groove 22 are fitted with a clearance, specifically, the width of the guide rail 12 is smaller than the width of the slide groove 22, so that the contact support 2 can not only slide along the guide rail 12 under the combined force F applied by the rocker arm 5, but also swing up or down relative to the guide rail 12, thereby realizing the function of the contact support 2 driving the contact bridge 4 to generate relative sliding friction between the contact 4 and the stationary contact 3.

[0073] Reference Figure 7 and Figure 8 In some examples, the contact support 2 is provided with a mounting hole 23, and a guide rib 24 is provided on the wall of the mounting hole 23. The contact bridge 4 passes through the mounting hole 23 and is provided with a guide groove 41. The contact bridge 4 is slidably connected to the guide rib 24 through the guide groove 41.

[0074] By setting guide ribs 24 in the mounting hole 23, the contact bridge 4 is slidably connected in the mounting hole 23 through the cooperation of guide groove 41 and guide ribs 24. The guide ribs 24 can be used to guide the movement of the contact bridge 4, so that when the contact bridge 4 slides towards the stationary contact 3 with the contact support 2, the contact bridge 4 can slide relative to the stationary contact 3 along the guide ribs 24, further enhancing the effect of removing impurities between the contact bridge 4 and the stationary contact 3.

[0075] Mounting hole 23 is formed on the side of contact support 2 near stationary contact 3, and contact bridge 4 passes through mounting hole 23. Guide rib 24 is provided on the hole wall of mounting hole 23, and guide rib 24 has a small offset angle with slide groove 22. This means that contact bridge 4 can gradually offset during sliding along guide rib 24, and finally slide relative to stationary contact 3 when contacting stationary contact 3. Combined with the radial offset that occurs when contact support 2 slides closer to stationary contact 3, the effect of relative sliding friction between the contact surface of contact bridge 4 and stationary contact 3 to remove impurities can be effectively enhanced, thus improving contact reliability.

[0076] Reference Figure 7 and Figure 8 In some examples, the guide rib 24 includes a first segment 241 and a second segment 242 connected together. The first segment 241 extends in the same direction as the sliding direction of the contact support 2. The second segment 242 is bent based on the first segment 241. The contact bridge 4 can slide relative to the stationary contact 3 when it moves from the first segment 241 to the second segment 242.

[0077] Dividing the guide rib 24 into a straight first section 241 and a bent second section 242 allows the contact bridge 4 to maintain a straight sliding motion when it begins to slide with the contact support 2, while the contact bridge 4 only shifts and slides when it is about to contact the stationary contact 3 and when it contacts the stationary contact 3. This can improve the removal effect of relative sliding friction between the contact bridge 4 and the stationary contact 3 in a small space.

[0078] The first segment 241 slides in the same direction as the contact support 2. Specifically, the first segment 241 is parallel to the slide groove 22. The second segment 242 is bent based on the first segment 241 to form an offset angle. This offset angle can be a small angle such as 5° or 7°, so that the contact bridge 4 can slide within a small range in the small space of the mounting hole 23, thereby reducing the space occupied while achieving relative sliding friction.

[0079] Reference Figure 5 In some examples, the distance from the end of the first lever arm 51 to the rotation center of the rotating part 52 is a, the distance from the end of the second lever arm 53 to the rotation center of the rotating part 52 is b, and the lever ratio of the rocker arm 5 is in the range of b:a greater than or equal to 1.5 and less than or equal to 2.

[0080] By designing the lever ratio of the rocker arm 5 within this range, while ensuring accurate driving of the contact bridge 4 to contact or separate from the stationary contact 3, the first lever arm 51 only needs a small stroke to achieve the effect of increasing the sliding distance of the contact support 2 through the second lever arm 53. The sliding distance of the contact support 2 away from the stationary contact 3 increases, that is, the opening distance increases, which can improve the reliability of the switching switch 100 disconnection, thereby ensuring that the dual coil contactor can achieve accurate and stable switching.

[0081] Specifically, the distance from the end of the first lever arm 51 to the rotation center of the rotating part 52 is defined as a, and the distance from the end of the second lever arm 53 to the rotation center of the rotating part 52 is defined as b. The rotating part 52 serves as the fulcrum of the rocker arm 5, thus making the rocker arm 5 form a lever-like structure.

[0082] The linkage column 55 is located at the end of the second lever arm 53 and connected to the contact support 2. When the first lever arm 51 is subjected to force and rotates around the fulcrum, the second lever arm 53 drives the contact support 2 to slide through the linkage column 55. In this embodiment, the ratio of b:a is between 1.5 and 2 (inclusive). Within this ratio range, the rocker arm 5 can accurately adapt to the relationship between the driving force and the opening distance, so that while the force on the first lever arm 51 remains unchanged, the opening distance between the contact bridge 4 and the stationary contact 3 is increased, ensuring that the contact bridge 4 and the stationary contact 3 can reliably disconnect.

[0083] In one alternative embodiment, the ratio of b:a can be 1.5, 1.75, or 2.0, etc. When b:a is less than 1.5, there may be insufficient driving force, resulting in poor contact between the contact bridge 4 and the stationary contact 3, or a small gap between the contact bridge 4 and the stationary contact 3. When b:a is greater than 2, although the gap increases, the driving force applied to the first lever arm 51 needs to be significantly increased. The range of 1.5-2 is exactly the optimal balance point for various performance aspects.

[0084] In some examples, the rotating part 52 includes a shaft 521 and a mounting groove 522 provided in the shaft 521. The housing 1 is provided with a shaft hole 11. The shaft 521 is rotatably connected to the shaft hole 11. A torsion spring 54 is installed in the mounting groove 522. The torsion spring 54 includes a first torsion arm 541 fixedly connected to the housing 1 and a second torsion arm 542 fixedly connected to the rotating part 52. When the first torsion arm 51 is subjected to force, the rotating part 52 rotates and can compress the torsion spring 54.

[0085] By integrally forming a shaft 521 on the rotating part 52 and directly rotatably connecting it to the housing 1, the assembly structure between the rocker arm 5 and the housing 1 is effectively simplified. Furthermore, by installing a torsion spring 54 on the shaft 521, energy can be stored during the rotation of the rocker arm 5, and the rocker arm 5 can be driven to rotate in the opposite direction when necessary. Simultaneously, the torsion spring 54 can be installed on the rocker arm 5 before the entire rocker arm 5 is installed to the housing 1, effectively simplifying the assembly operation and improving assembly efficiency.

[0086] The housing 1 includes a bottom shell 13 and a cover plate 14. Referring to the figure, a pivot hole 11 is provided on the bottom shell 13. A shaft 521 is provided on the side of the rotating part 52 near the bottom shell 13. The shaft 521 is a cylindrical protrusion provided on the surface of the rocker arm 5. The height of the cylindrical protrusion is the same as the depth of the pivot hole 11, and the diameter of the shaft 521 matches that of the pivot hole 11. The rocker arm 5 and the bottom shell 13 can be rotated by directly inserting the shaft 521 into the pivot hole 11. This rotating fit structure is simple in structure and easy to install.

[0087] The mounting groove 522 is located on the side of the rotating part 52 near the cover plate 14. The mounting groove 522 is an annular groove, and the axis of the mounting groove 522 is the same as that of the shaft 521. The torsion spring 54 is fitted in the annular mounting groove 522. During assembly, the torsion spring 54 can be installed into the mounting groove 522 first, and then the rocker arm 5 can be installed as a whole onto the bottom shell 13, which helps to improve the assembly speed.

[0088] The first torsion arm 541 of the torsion spring 54 extends in the same direction as the first lever arm 51, while the second torsion arm 542 extends in the opposite direction to the first lever arm 51. The first torsion arm 541 is fixedly connected to the bottom shell 13, and the second torsion arm 542 is fixedly connected to the mounting groove 522. This allows the first torsion arm 541 to remain stationary while the second torsion arm 542 rotates relative to the first torsion arm 541 to allow the torsion spring 54 to store energy when the rocker arm 5 rotates clockwise relative to the bottom shell 13.

[0089] When the force applied to the first lever arm 51 disappears, the torsion spring 54 instantly releases energy, the first torsion arm 541 remains stationary, and the second torsion arm 542 drives the rocker arm 5 to rotate counterclockwise, quickly pushing the contact support 2 towards the stationary contact 3 to achieve rapid closing of the changeover switch 100. The torsion spring 54 can also be configured as a helical spring, tension spring, or torsion spring, or other elastic structural component.

[0090] 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, characterized in that, include: case; A contact support is slidably mounted on the housing along the axial direction, and the contact support is provided with a linkage hole; The stationary contact is fixedly installed in the housing; A contact bridge is movably mounted on the contact support; A rocker arm 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 linkage post, which is rotatably connected to the linkage hole; The first lever arm is subjected to force to rotate the rocker arm, and the second lever arm drives the contact to slide through the cooperation of the linkage column and the linkage hole, thereby realizing the contact bridge and the stationary contact contact and separation.

2. The changeover switch according to claim 1, characterized in that, During the rotation of the second lever arm around the rotating part, the linkage column applies a combined force to the wall of the linkage hole, which is decomposed into: A first component of the force along the sliding direction of the contact; A second component force having a preset angle α with the first component force; The first component force drives the contact support to slide axially to achieve contact or separation between the contact bridge and the stationary contact. The second component force is used to cause the contact support to produce radial displacement. The radial displacement of the contact support enables the contact bridge and the stationary contact in the contact state to generate relative sliding friction to remove impurities from the contact surface.

3. The changeover switch according to claim 2, characterized in that, The preset included angle α is greater than 0° and less than 90°.

4. The changeover 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. The guide rail and the sliding groove are fitted with a clearance, and the clearance is adapted to the radially offset distance of the contact support.

5. The changeover switch according to claim 1, characterized in that, The contact support is provided with a mounting hole, and a guide rib is provided on the wall of the mounting hole. The contact bridge passes through the mounting hole and is provided with a guide groove. The contact bridge is slidably connected to the guide rib through the guide groove.

6. The changeover switch according to claim 5, characterized in that, The guide rib includes a first segment and a second segment connected together. The first segment extends in the same direction as the sliding direction supported by the contact. The second segment is bent based on the first segment. The contact bridge can slide relative to the stationary contact when it moves from the first segment to the second segment.

7. The changeover switch according to any one 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 lever ratio of the rocker arm is within the range of b:a greater than or equal to 1.5 and less than or equal to 2.

8. The changeover switch according to any one 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. A torsion spring is installed in the mounting groove. The torsion spring includes a first torsion arm fixedly connected to the housing and a second torsion arm fixedly connected to the rotating part. When the first torsion arm is subjected to force, the rotating part rotates and can compress the torsion spring.

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