A micro switch

Abstract

This utility model discloses a micro switch, including a housing assembly, a pressing assembly, and a switch body. The housing assembly includes a shell, a top cover, a first washer block, and a protective cover. The switch body is located in the shell and includes a core transition plate and NC pin fixing shaft, NO pin fixing shaft, and COM pin fixing shaft mounted on the core transition plate and extending from the bottom of the shell. The assembly formed by welding the shell, top cover, and first washer is tin-plated. After tin plating, the protective cover is tin-soldered to the top surface of the tin-plated first washer. The core transition plate is welded to the inner wall of the shell. The bottom of the shell is sealed with glue. Therefore, the micro switch has good cavity sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of switches, specifically to a micro switch. Background Technology

[0002] A micro switch mainly consists of a housing, a top cover, a button, a normally open stationary contact, a normally closed stationary contact, and a moving contact that can make contact with the normally open or normally closed stationary contact to conduct electricity, driven by the button. When in use, pressing the button connects the circuit, and pressing it disconnects the circuit. However, the sealing at the connection between the housing, top cover, and other components of traditional micro switches is not strong. When used in applications requiring high sealing performance, solid dust particles (both conductive and non-conductive) and water mist can enter the switch cavity, causing the switch to malfunction. In severe cases, it can burn out critical components, leading to the complete shutdown of the equipment. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a micro switch, which mainly solves the problem of poor cavity sealing in existing micro switches.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A micro switch includes a housing assembly, a pressing assembly, and a switch body;

[0006] The housing assembly includes an outer shell, a top cover, a first washer block, and a protective cover. The top cover is welded around the entire circumference of the side wall at the top opening of the outer shell. The top cover has a through hole. The first washer is welded around the entire circumference of the top surface of the top cover and surrounds the through hole. The protective cover is welded around the entire circumference of the top surface of the first washer. The pressure plate limiting block is welded around the entire circumference of the top surface of the top cover. The protective cover is soldered around the entire circumference of the top surface of the first washer.

[0007] The switch body, located within the housing, includes a core transition plate and NC pin fixing shafts, NO pin fixing shafts, and COM pin fixing shafts extending from the bottom of the housing. The core transition plate is welded to the inner wall of the housing around its entire circumference. COM pin fixing blocks, NO pin fixing blocks, and NC pin fixing blocks are mounted on the core fixing plate. The COM pin fixing blocks, NO pin fixing blocks, and NC pin fixing blocks are made of PEEK material. An upper stationary contact is mounted on the upper end of the NC pin fixing shaft, and a lower stationary contact is mounted on the upper end of the NO pin fixing shaft. The upper and lower stationary contacts are spaced apart and opposite each other. A moving contact fixing plate is mounted on the upper end of the COM pin fixing shaft. An elastic moving contact is mounted on the trigger fixing plate. One end of the moving contact has contacts on both its upper and lower surfaces, located between the upper and lower stationary contacts.

[0008] The pressing assembly includes a pressure plate shaft, a pressure plate, a trigger head, a trigger fixing plate, and a second washer. The lower end of the pressure plate shaft is fixed to the trigger fixing plate, and the upper end of the pressure plate shaft is fixed to the pressure plate. The pressure plate is located above the pressure plate limiting block. A shoulder is provided in the middle of the pressure plate shaft. The second washer is located below the cover and is riveted to the pressure plate shaft. The shoulder and the second washer cooperate to clamp the cover. The trigger head is fixed on the trigger fixing plate and is opposite to the moving contact piece.

[0009] The bottom of the outer casing is sealed with glue.

[0010] Preferably, the components formed by welding the outer shell, the top cover, the first gasket, and the pressure plate limiting block are tin-plated, and the protective cover is tin-plated and then soldered around the top surface of the tin-plated first gasket.

[0011] Preferably, an inner sheath is installed inside the outer shell, with the top surface of the inner sheath contacting the bottom surface of the upper cover, and the top surface of the core transition plate abutting against the bottom surface of the inner sheath.

[0012] Preferably, the lower contact piece, upper contact piece, moving contact piece fixing plate, NC pin fixing shaft, NO pin fixing shaft, COM pin fixing shaft, cover, and second washer are made of copper, the first washer and core transition plate are made of stainless steel, and the transition plate pad is made of mica.

[0013] Preferably, the housing assembly further includes a pressure plate limiting block welded around the entire circumference of the top surface of the cover, with the pressure plate located above the pressure plate limiting block.

[0014] This utility model has the following beneficial effects:

[0015] The micro switch of this invention has a tin-plated assembly formed by welding the outer shell, top cover, and first washer. After the protective cover is tin-plated, it is fixed to the top surface of the tin-plated first washer by soldering around the entire circumference. The core transition plate is welded around the inner wall of the outer shell, and the bottom of the outer shell is sealed with glue. Therefore, the cavity of the micro switch has good sealing performance. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the micro switch according to an embodiment of the present invention;

[0017] Figure 2 This is an overall structural diagram of the micro switch according to an embodiment of the present invention;

[0018] Figure 3 This is an exploded view of the housing assembly according to an embodiment of the present invention;

[0019] Figure 4 This is an exploded view of the micro switch according to an embodiment of this utility model;

[0020] Figure 5 This is an exploded view of the internal structure of the micro switch according to an embodiment of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0023] like Figures 1 to 5 As shown in the figure, this embodiment discloses a micro switch, including a housing assembly, a pressing assembly, and a switch body.

[0024] The housing assembly includes an outer shell, a top cover, a first gasket, a pressure plate limiting block, and a protective cover. The top cover is welded to the sidewall of the top opening of the outer shell around its entire circumference. The top cover has a through hole. The first gasket is welded to the top surface of the top cover around its entire circumference and surrounds the through hole. The protective cover is welded to the top surface of the first gasket around its entire circumference. The pressure plate limiting block is welded to the top surface of the top cover around its entire circumference. The assembly formed by welding the outer shell, top cover, first gasket, and pressure plate limiting block is tin-plated. After tin plating, the protective cover is tin-soldered to the top surface of the tin-plated first gasket. The pressure plate limiting block is used to limit the pressure plate. The top surface of the pressure plate limiting block has a groove. The pressure plate is in the groove. The groove wall limits the pressure plate on both sides to prevent the pressure plate from shifting left and right, but there is a slight gap to allow for slight shifting.

[0025] The switch body includes an NC pin fixing shaft, a NO pin fixing shaft, and a COM pin fixing shaft extending from the bottom of the housing. An upper stationary contact is mounted (preferably riveted) on the upper end of the NC pin fixing shaft, and a lower stationary contact is mounted (preferably riveted) on the upper end of the NO pin fixing shaft. The upper and lower stationary contacts are spaced apart and opposite each other. A moving contact fixing plate is mounted on the upper end of the COM pin fixing shaft. An elastic moving contact is mounted on the trigger fixing plate. The upper and lower surfaces of one end of the moving contact are provided with contacts and are located between the upper and lower stationary contacts.

[0026] The pressing assembly includes a pressure plate shaft, a pressure plate, a trigger head, a trigger fixing plate, and a second washer. The lower end of the pressure plate shaft is fixed to the trigger fixing plate (preferably riveted), and the upper end of the pressure plate shaft is fixed to the pressure plate (preferably riveted). The pressure plate is located above the pressure plate limiting block. A shoulder is provided in the middle of the pressure plate shaft, which separates the cover and the pressure plate. The second washer is located below the cover and riveted to the pressure plate shaft (the outer diameter of the second washer is smaller than the inner diameter of the first washer). The shoulder and the second washer cooperate to clamp the cover (to prevent dust or moisture from entering between the inner hole of the cover and the gap of the pressure plate shaft). The trigger head is riveted to the trigger fixing plate and is opposite to the moving contact piece.

[0027] Preferably, the switch body further includes a core transition plate, a transition plate pad, a COM pin fixing block, a NO pin fixing block, and an NC pin fixing block. The core transition plate is provided with mounting holes for mounting the COM pin fixing block, NO pin fixing block, and NC pin fixing block, respectively. The COM pin fixing block, NO pin fixing block, and NC pin fixing block are made of PEEK material. The transition plate pad is made of mica board material, which serves to provide insulation and high temperature resistance. The transition plate pad has holes for assisting in fixing the COM pin fixing block, NO pin fixing block, and NC pin fixing block.

[0028] To limit the position of the core transition plate, an inner sleeve is installed inside the outer casing. The top surface of the inner sleeve contacts the bottom surface of the upper cover, and the top surface of the core transition plate abuts against the bottom surface of the inner sleeve. The position of the core transition plate within the outer casing is limited by the inner sleeve. After the bottom of the outer casing is sealed with adhesive, the position of the core transition plate is fixed. In other embodiments, the method of limiting the position of the core transition plate is not limited to this; protrusions or ribs can also be provided inside the outer casing to limit the position of the core transition plate.

[0029] During assembly, screw the COM pin fixing block, NO pin fixing block, and NC pin fixing block into the corresponding mounting holes on the core transition plate. Press the NC pin fixing shaft into the inner hole of the NC pin fixing block. Place the high-temperature resistant mica plate transition plate pad at the corresponding position above the core transition plate. Then press the NO pin fixing shaft into the inner hole of the NO pin fixing block and the COM pin fixing shaft into the COM pin fixing block. Assemble these components into the assembly. Then assemble it with the housing assembly. Each of the NC pin fixing shaft, NO pin fixing shaft, and COM pin fixing shaft has an external wire connected to it. After adjusting the parameters, fix and seal the gap between the core transition plate and the housing with solder (the core transition plate is soldered to the inner wall of the housing around its entire circumference). Then, seal the bottom space of the housing with glue (preferably two-component black glue) to achieve the best sealing effect.

[0030] Initially, the contacts on the upper surface of the moving contact are in contact with the upper stationary contact, while the contacts on the lower surface of the moving contact are separated from the lower stationary contact. When the pressure plate is pressed down, the entire pressing assembly moves down synchronously, triggering the fixing plate and causing the trigger head to move down to press the moving contact. The moving contact deforms and warps, causing the contacts on the upper surface of the moving contact to separate from the upper stationary contact, while the contacts on the lower surface of the moving contact make contact with the lower stationary contact. When the pressure on the pressure plate is released, the moving contact rebounds, causing the trigger fixing plate to move up, the pressing assembly to move up and reset, and the moving contact returns to its initial state.

[0031] The outer shell, top cover, first gasket, and pressure plate limiting block are laser-welded around the circumference and then tin-plated. After tin plating, the cover surface is tin-soldered around the circumference to fix it to the top surface of the tin-plated first gasket. The bottom space of the outer shell is sealed with glue to achieve an effective seal of the inner cavity of the outer shell, achieving the best sealing effect. The gap between the core transition plate and the outer shell is fixed and sealed with solder, and then the bottom space of the outer shell is sealed with glue, creating a double sealing effect at the bottom of the cavity and strengthening the sealing effect.

[0032] The lower stationary contact, upper stationary contact, moving contact fixing plate, NC pin fixing shaft, NO pin fixing shaft, COM pin fixing shaft, cover, and second washer are made of copper. The first washer, core transition plate, and transition plate pad are made of stainless steel. The COM pin fixing block, NO pin fixing block, and NC pin fixing block are made of PEEK. The transition plate pad is made of mica board. Therefore, this micro switch has good high temperature resistance.

[0033] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A micro switch, characterized in that, Includes housing assembly, pressing assembly, and switch body; The housing assembly includes an outer shell, a top cover, a first washer block, and a protective cover. The top cover is welded around the entire circumference of the sidewall at the top opening of the outer shell. The top cover has a through hole. The first washer is welded around the entire circumference of the top surface of the top cover and surrounds the through hole. The protective cover is welded around the entire circumference of the top surface of the first washer. The housing assembly is tin-plated. The switch body, located within the housing, includes a core transition plate and NC pin fixing shafts, NO pin fixing shafts, and COM pin fixing shafts extending from the bottom of the housing. The core transition plate is welded to the inner wall of the housing around its entire circumference. COM pin fixing blocks, NO pin fixing blocks, and NC pin fixing blocks are mounted on the core fixing plate. The COM pin fixing blocks, NO pin fixing blocks, and NC pin fixing blocks are made of PEEK material. An upper stationary contact is mounted on the upper end of the NC pin fixing shaft, and a lower stationary contact is mounted on the upper end of the NO pin fixing shaft. The upper and lower stationary contacts are spaced apart and opposite each other. A moving contact fixing plate is mounted on the upper end of the COM pin fixing shaft. An elastic moving contact is mounted on the trigger fixing plate. One end of the moving contact has contacts on both its upper and lower surfaces, located between the upper and lower stationary contacts. The pressing assembly includes a pressure plate shaft, a pressure plate, a trigger head, a trigger fixing plate, and a second washer. The lower end of the pressure plate shaft is fixed to the trigger fixing plate, and the upper end of the pressure plate shaft is fixed to the pressure plate. A shoulder is provided in the middle of the pressure plate shaft. The second washer is located below the cover and is riveted to the pressure plate shaft. The shoulder and the second washer cooperate to clamp the cover. The trigger head is fixed on the trigger fixing plate and is opposite to the moving contact piece. The bottom of the outer casing is sealed with glue.

2. The micro switch according to claim 1, characterized in that, The components formed by welding the outer shell, top cover, and first gasket are tin-plated. After the protective cover is tin-plated, it is tin-soldered around the top surface of the tin-plated first gasket.

3. The micro switch according to claim 1, characterized in that, An inner sheath is installed inside the outer shell, with the top surface of the inner sheath contacting the bottom surface of the upper cover, and the top surface of the core transition plate abutting the bottom surface of the inner sheath.

4. The micro switch according to claim 1, characterized in that, The lower stationary contact, upper stationary contact, moving contact fixing plate, NC pin fixing shaft, NO pin fixing shaft, COM pin fixing shaft, cover, and second washer are made of copper, while the first washer and core transition plate are made of stainless steel, and the transition plate pad is made of mica.

5. The micro switch according to claim 1, characterized in that, The housing assembly also includes a pressure plate limiting block welded around the top surface of the cover, with the pressure plate located above the pressure plate limiting block.

Images