A linkage mechanism for a switch and the switch
By simplifying the linkage mechanism and using insulating sheets, the problems of numerous parts, complex structure, and difficulty in controlling the distance between the coil and the contact in high-speed mechanical switches are solved, resulting in higher operational reliability and safety, and improved assembly efficiency and insulation performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI LIANGXIN ELECTRICAL CO LTD
- Filing Date
- 2025-05-07
- Publication Date
- 2026-06-16
AI Technical Summary
Existing high-speed mechanical switches suffer from problems such as a large number of parts, complex structure, low assembly efficiency, difficulty in controlling the distance between the coil and the contact, and poor insulation performance, resulting in insufficient reliability and safety of operation.
It adopts a simplified linkage mechanism, including a main shaft, transmission linkage and tension spring structure, with automatic correction and limit functions, automatic adjustment of preload, and use of insulating sheets to improve the insulation performance between the coil and the contacts.
The transmission structure has been simplified, the reliability and safety of the switch operation have been improved, friction loss has been reduced, the insulation performance between the coil and the contacts has been enhanced, and the assembly efficiency and overall performance have been improved.
Smart Images
Figure CN224366700U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of switch technology, specifically relating to a linkage mechanism for a switch and the switch itself, particularly suitable for high-speed mechanical switches. Background Technology
[0002] DC circuit breakers typically incorporate high-speed mechanical switches in their main current-carrying branches. In the prior art, Chinese Patent 202411078531.2 discloses a compact ultra-high-speed mechanical switch. Its moving contact combines a traditional drive repulsion disk and conductive contact, reducing the size of the mechanical switch. It employs a bridge-type contact mechanism to increase the break gap and arc voltage, thereby improving the arc extinguishing speed. A graded push-type opening strategy reduces the mass of moving parts, thus lowering the response time and effectively buffering the opening speed. This significantly improves the mechanical life of the ultra-high-speed mechanical switch and offers advantages such as small size, simple structure, and easy functionality.
[0003] In existing technologies, mechanical switches often employ a double-sided symmetrical spring structure, with two springs on each side to provide contact pressure. However, this structure, with two springs on each side to provide contact pressure, has several drawbacks: First, it involves a large number of parts, requiring independent installation of the four springs on both sides, resulting in a complex supporting structure; second, the compression direction of the springs is perpendicular to the direction of action, occupying excessive lateral space; third, it suffers from low assembly efficiency, requiring precise preload adjustment for multiple springs, which increases the manufacturing difficulty; and fourth, the springs experience significant frictional wear, which can lead to lag during high-speed operation, necessitating the application of lubricant during assembly.
[0004] Meanwhile, compact high-speed mechanical switches typically use coil-induced eddy currents to generate an electric repulsive force that actuates the contacts, with the coil fixed on a repulsive disk. Due to the compact structure, the distance between the coil and the moving contact often needs to be controlled within ≤1mm, which is difficult to control in actual assembly. If the distance is too large, the repulsive force will be too small, making it difficult to operate; if the distance is too small, the coil and the contact will conduct, but the main circuit will not conduct. To avoid this situation, existing technology uses resin casting to achieve insulation of the coil, but this method is time-consuming and inefficient. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing high-speed mechanical switches by providing a linkage mechanism and the switch itself. This simplifies the transmission structure, provides automatic correction and limit functions, automatically adjusts the preload, further improves the insulation performance between the coil and the contacts, and enhances the reliability and safety of the entire switch operation.
[0006] Technical solution
[0007] To achieve the above-mentioned technical objectives, this utility model provides a linkage mechanism for a switch, including a main shaft 50. The main shaft 50 is characterized in that: one end is fixedly connected to an intermediate connecting plate 60; the left and right ends of the intermediate connecting plate 60 are respectively pivotally connected to one end of a left transmission link 70 and one end of a right transmission link 80; the other ends of the left transmission link 70 and the right transmission link 80 are rotatably mounted on corresponding left and right connecting shafts 90 and 100, respectively; the two ends of the left and right connecting shafts 90 and 100 are respectively mounted in trajectory holes 111 and 111' on a connecting shaft limiting plate 110; the ends of the left and right connecting shafts 90 and 100 located on the same side of the connecting shaft limiting plate 110 are connected by a tension spring 120 and a tension spring 130, respectively, with the tension springs 120 and 130 located outside the connecting shaft limiting plate 110.
[0008] In one embodiment, the track holes 111, 111' are waist-shaped holes.
[0009] In one embodiment, one end of the spindle 50, which is fixedly connected to the intermediate connecting plate 60, extends out of the bottom of the intermediate connecting plate 60 and is equipped with a guide sleeve 140. The guide sleeve 140 is located in the limiting guide hole 150 on the bottom of the lower housing a and can slide up and down for guidance.
[0010] In one embodiment, the end of the spindle 50 that is fixedly connected to the intermediate connecting plate 60 is located in the center of the intermediate connecting plate 60.
[0011] In one embodiment, the left drive link 70 and the right drive link 80 are symmetrically arranged on the left and right sides of the main shaft 50.
[0012] In one embodiment, the intermediate connecting plate 60 is a U-shaped plate, and the two side arms 61 and 62 of the U-shaped plate are symmetrically located on the front and rear sides of the main shaft 50.
[0013] In one embodiment, the left transmission link 70 and the right transmission link 80 are both U-shaped plates, and the left transmission link 70 and the right transmission link 80 are respectively pivotally connected to the two ends of the intermediate connecting plate 60 through connecting shaft one 160 and connecting shaft two 170.
[0014] This utility model also provides a switch, characterized in that: it includes the linkage mechanism, the other end of the main shaft 50 is equipped with a moving contact 10, the contact pair 101 of the moving contact 10 corresponds to the stationary contact pair 40, the other end of the main shaft 50 passes through the connecting hole 10a on the moving contact 10 and corresponds to the tripping coil 180, a limit switch 190 is arranged between the tripping coil 180 and the upper surface of the moving contact 10, a closing coil 200 is arranged below the moving contact 10, and a limit switch 210 is arranged between the closing coil 200 and the lower surface of the moving contact 10.
[0015] Preferably, both the first limiter 190 and the second limiter 210 are insulating sheets.
[0016] Preferably, the insulating sheet is a mica sheet with a thickness of ≤1mm.
[0017] Beneficial effects
[0018] This utility model provides a linkage mechanism for a switch and the switch itself. The linkage mechanism includes a main shaft 50, one end of which is fixedly connected to an intermediate connecting plate 60. The left and right ends of the intermediate connecting plate 60 are respectively pivotally connected to one end of a left transmission link 70 and one end of a right transmission link 80. The other ends of the left transmission link 70 and the right transmission link 80 are respectively rotatably mounted on corresponding left link shafts 90 and right link shafts 100. The two ends of the left link shaft 90 and the right link shaft 100 are respectively mounted in track holes 111 and 111' on a link shaft limiting plate 110. The ends of the left link shaft 90 and the right link shaft 100 located on the same side of the link shaft limiting plate 110 are respectively connected by a tension spring 120 and a tension spring 130. The tension spring 120 and the tension spring 130 are located on the outside of the link shaft limiting plate 110. The transmission structure has been simplified, and it has automatic correction and limit functions. The preload can be automatically adjusted, the insulation performance between the coil and the contact has been further improved, and the reliability and safety of the entire switch operation have been enhanced. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Appendix Figure 1 This is a product drawing of the switch in an embodiment of this utility model;
[0021] Appendix Figure 2 This is a schematic diagram of the switch structure in an embodiment of this utility model;
[0022] Appendix Figure 3 This is a schematic diagram of the switch being in the open state in an embodiment of this utility model;
[0023] Appendix Figure 4 This is a schematic diagram showing the position of the insulating sheet in an embodiment of this utility model;
[0024] Appendix Figure 5 It is attached Figure 4 Enlarged view of point A in the middle
[0025] Appendix Figure 6 This is a product drawing of the linkage mechanism in the embodiment of this utility model;
[0026] Appendix Figure 7 This is a front view of the linkage mechanism in an embodiment of this utility model;
[0027] Appendix Figure 8 This is a top view of the linkage mechanism in an embodiment of this utility model;
[0028] Appendix Figure 9 This is a left view of the linkage mechanism in an embodiment of this utility model; Detailed Implementation
[0029] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.
[0034] Example
[0035] In existing technologies, mechanical switches often employ a double-sided symmetrical spring structure, with two springs on each side to provide contact pressure. However, this structure, with two springs on each side to provide contact pressure, has several drawbacks: First, it involves a large number of parts, requiring independent installation of the four springs on both sides, resulting in a complex supporting structure; second, the compression direction of the springs is perpendicular to the direction of action, occupying excessive lateral space; third, it suffers from low assembly efficiency, requiring precise preload adjustment for multiple springs, which increases the manufacturing difficulty; and fourth, the springs experience significant frictional wear, which can lead to lag during high-speed operation, necessitating the application of lubricant during assembly.
[0036] Meanwhile, compact high-speed mechanical switches typically use coil-induced eddy currents to generate an electric repulsive force that actuates the contacts, with the coil fixed on a repulsive disk. Due to the compact structure, the distance between the coil and the moving contact often needs to be controlled within ≤1mm, which is difficult to control in actual assembly. If the distance is too large, the repulsive force will be too small, making it difficult to operate; if the distance is too small, the coil and the contact will conduct, but the main circuit will not conduct. To avoid this situation, existing technology uses resin casting to achieve insulation of the coil, but this method is time-consuming and inefficient.
[0037] To solve the above problems, see attached Figures 6-9As shown, this embodiment provides a linkage mechanism for a switch, including a main shaft 50. One end of the main shaft 50 is fixedly connected to an intermediate connecting plate 60. The left and right ends of the intermediate connecting plate 60 are respectively pivotally connected to one end of a left transmission link 70 and one end of a right transmission link 80. The other ends of the left transmission link 70 and the right transmission link 80 are rotatably mounted on corresponding left link shafts 90 and right link shafts 100. The two ends of the left link shaft 90 and the right link shaft 100 are respectively mounted in trajectory holes 111 and 111' on a link shaft limiting plate 110. The ends of the left link shaft 90 and the right link shaft 100 on the same side of the link shaft limiting plate 110 are respectively connected by a tension spring 120 and a tension spring 130. Only one tension spring is needed on each side, which is beneficial for product miniaturization and stability. The tension springs are symmetrically arranged and together with the left link shaft 90 and the right link shaft 100, they have both limiting and anti-deflection functions. The track holes 111 and 111' are oblong holes that allow the spindle 50 to move up and down through displacement compensation. Furthermore, a guide sleeve 140 is installed at the lower end of the spindle 50, extending out from the bottom of the intermediate connecting plate 60. The guide sleeve 140 is located in a limiting guide hole 150 on the bottom of the lower housing a and can slide up and down for guidance. The portion of the spindle 50 fixedly connected to the intermediate connecting plate 60 is located in the center of the intermediate connecting plate 60. The left drive linkage 70 and the right drive linkage 80 are symmetrically arranged on the left and right sides of the spindle 50.
[0038] As attached Figure 6 As shown, the intermediate connecting plate 60 is a U-shaped plate, with its two side arms 61 and 62 symmetrically located on the front and rear sides of the main shaft 50. The left transmission connecting rod 70 and the right transmission connecting rod 80 are both U-shaped plates, and are pivotally connected to both ends of the intermediate connecting plate 60 via connecting shaft one 160 and connecting shaft two 170, respectively. (See attached diagram) Figure 8 As shown, tension spring 120 and tension spring 130 are located outside the connecting rod shaft limiting plate 110.
[0039] As attached Figures 1-5 As shown, this utility model also provides a switch, including the aforementioned linkage mechanism, which is installed in the lower housing a. A moving contact 10 is mounted at the other end of the main shaft 50. The contact pair 101 of the moving contact 10 corresponds to the stationary contact pair 40. The other end of the main shaft 50 passes through the connecting hole 10a on the moving contact 10 and corresponds to the opening coil 180. A limit switch 190 is arranged between the opening coil 180 and the upper surface of the moving contact 10. A closing coil 200 is arranged below the moving contact 10, and a limit switch 210 is arranged between the closing coil 200 and the lower surface of the moving contact 10. In this embodiment, both the first limit switch 190 and the second limit switch 210 are insulating sheets. The insulating sheet is a mica sheet with a thickness ≤1mm, which ensures the distance between the coil and the contact.
[0040] When the high-speed mechanical switch provided in this embodiment reaches a steady state after opening, the linkage mechanism reaches equilibrium at the dead point, and the opening coil provides electromagnetic repulsion. When the switch reaches a steady state after closing, the trajectory hole and tension spring in the linkage shaft limit plate 110 provide tension and limiting force, and the closing coil provides electromagnetic repulsion.
[0041] In this embodiment, when the circuit is under normal current flow, the moving contact and the stationary contact are closed, and the high-speed mechanical switch achieves normal current flow. When a short circuit fault occurs in the circuit, the pre-charge capacitor in the drive circuit discharges to the trip coil. Under the action of the pulse current, the moving contact induces eddy currents, which in turn generate a downward electromagnetic repulsion force to move downward at high speed, and the high-speed mechanical switch completes the tripping action. When the short circuit fault is cleared, the drive capacitor with reverse voltage discharges to the closing coil. The closing repulsion disk induces eddy currents and is subjected to an upward electromagnetic repulsion force. The movable part moves upward as a whole, and the silver contacts of the stationary contact and the moving contact make contact and stabilize, and the high-speed mechanical switch completes the closing action.
[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0043] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A linkage mechanism for a switch, comprising a main shaft (50), characterized in that: One end of the main shaft (50) is fixedly connected to the intermediate connecting plate (60). The left and right ends of the intermediate connecting plate (60) are pivotally connected to one end of the left transmission connecting rod (70) and one end of the right transmission connecting rod (80), respectively. The other ends of the left transmission connecting rod (70) and the right transmission connecting rod (80) are rotatably mounted on the corresponding left connecting rod shaft (90) and right connecting rod shaft (100), respectively. The two ends of the left connecting rod shaft (90) and right connecting rod shaft (100) are respectively mounted in the track holes (111, 111') on the connecting rod shaft limiting plate (110). The ends of the left connecting rod shaft (90) and right connecting rod shaft (100) on the same side of the connecting rod shaft limiting plate (110) are connected by tension spring one (120) and tension spring two (130), respectively. The tension spring one (120) and tension spring two (130) are located on the outside of the connecting rod shaft limiting plate (110).
2. The linkage mechanism of the switch as described in claim 1, characterized in that: The track hole (111, 111') is an oblong hole.
3. The linkage mechanism of the switch as described in claim 1, characterized in that: One end of the main shaft (50) that is fixedly connected to the intermediate connecting plate (60) extends out of the bottom of the intermediate connecting plate (60) and is equipped with a guide sleeve (140). The guide sleeve (140) is located in the limiting guide hole (150) on the bottom of the lower housing (a) and can slide up and down for guidance.
4. The linkage mechanism of the switch as described in claim 1, characterized in that: The end of the main shaft (50) that is fixedly connected to the intermediate connecting plate (60) is located in the center of the intermediate connecting plate (60).
5. The linkage mechanism of the switch as described in claim 1, characterized in that: The left drive link (70) and the right drive link (80) are symmetrically arranged on the left and right sides of the main shaft (50).
6. The linkage mechanism of the switch as described in claim 1, characterized in that: The intermediate connecting plate (60) is a U-shaped plate, and the two arms (61, 62) of the U-shaped plate are symmetrically located on the front and rear sides of the main shaft (50).
7. The linkage mechanism of the switch as described in claim 1, characterized in that: The left transmission link (70) and the right transmission link (80) are both U-shaped plates. The left transmission link (70) and the right transmission link (80) are respectively pivotally connected to the two ends of the intermediate connecting plate (60) through connecting shaft one (160) and connecting shaft two (170).
8. A switch, characterized in that: The linkage mechanism includes any one of claims 1-7, wherein the other end of the main shaft (50) is equipped with a moving contact (10), the contact pair (101) of the moving contact (10) corresponds to the stationary contact pair (40, 40'), the other end of the main shaft (50) passes through the connecting hole (10a) on the moving contact (10) and corresponds to the tripping coil (180), a limit position one (190) is arranged between the tripping coil (180) and the upper surface of the moving contact (10), a closing coil (200) is arranged below the moving contact (10), and a limit position two (210) is arranged between the closing coil (200) and the lower surface of the moving contact (10).
9. The switch as described in claim 8, characterized in that: Both limit one (190) and limit two (210) are insulating sheets.
10. The switch as claimed in claim 9, characterized in that: The insulating sheet is a mica sheet with a thickness of ≤1mm.