Reverse press waterproof sealed micro switch

Abstract

The utility model provides a kind of reverse pressing type waterproof sealed micro switch, including base assembly and the shell being installed on the end surface of base assembly;The end surface of the base assembly is equipped with support frame, and support frame is equipped with flat spring piece assembly, and it is equipped with bow spring piece between flat spring piece assembly and support frame;The shell is equipped with button, and it is equipped with sealing ring of tile structure between button and shell, and is compressed by compression ring;Pin of the base assembly is loaded into sealing seat after wire bonding;The shell is also equipped with press-down piece, and press-down piece is connected with shell by rivet;Button, press-down piece, compression spring, rivet are composed of reverse pressing type executive mechanism.The utility model passes through reverse pressing type executive mechanism, solves the overstroke reasonable use problem of switch;By increasing a tile structure sealing ring for waterproof sealing treatment to switch button cooperation place, solve the dynamic waterproof sealing problem of switch.

Description

Technical Field

[0001] This utility model relates to a reverse-press type waterproof and sealed micro switch, belonging to the field of electromechanical component technology. Background Technology

[0002] Microswitches, also known as sensitive switches, are highly sensitive in action and have high stroke accuracy. Typically, microswitches are pressed in a forward-facing manner, meaning the pressing direction is along the axis of the actuator towards the inside of the switch. To accommodate mechanisms with large actuation strokes, the traditional approach is to add a spring plate to a basic switch to increase the overtravel. However, in actual use, the spring plate is prone to deformation, difficult to adjust, and the overtravel is difficult to utilize properly, easily leading to incomplete or excessive pressing of the switch.

[0003] Secondly, as the reliability requirements for electronic products such as microswitches become increasingly stringent, switches are required to have dynamic sealing functions such as dustproof and waterproof features to improve their environmental adaptability and contact reliability. Currently, O-ring structures are commonly used for dynamic waterproof sealing of switches. However, O-ring structures have extremely high requirements for the dimensional accuracy and interference fit of the O-ring and mating parts. If the interference fit is too small, the sealing effect will be poor; if the interference fit is too large, the switch will be inflexible in switching or even jamming. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a reverse-press type waterproof and sealed micro switch, which solves the problems of reasonable use of overtravel and dynamic waterproof sealing of existing forward-press type micro switches.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a reverse-press type waterproof and sealed micro switch, including a base assembly and a housing mounted on the upper end face of the base assembly; the end face of the base assembly is provided with a support frame, the support frame is provided with a flat spring assembly, and a bow spring is provided between the flat spring assembly and the support frame; the housing is provided with a button, and a tile-shaped sealing ring is provided between the button and the housing, and is pressed by a pressure ring; the pin of the base assembly is welded with wires and then installed into a sealing seat; the housing is also provided with an actuating piece, which is connected to the housing by a rivet; the button, the actuating piece, the pressure spring, and the rivet constitute a reverse-press type actuation mechanism.

[0007] One end of the support frame is provided with a U-shaped groove, and the other end is provided with a V-shaped groove.

[0008] One end of the flat spring assembly is hung on the U-shaped groove, and the other end is suspended in the air.

[0009] One end of the bow spring is hooked into the suspended end of the flat spring assembly, and the other end is hooked into the V-groove.

[0010] The pressure ring and the outer shell are sealed with epoxy resin adhesive.

[0011] The mating surfaces of the outer shell and the base assembly are coated with epoxy resin adhesive for secure bonding.

[0012] The upper part of the base assembly and the sealing seat are coated with epoxy resin for sealing. Then, after the switch is inverted, epoxy resin is poured into the lower part of the base assembly and the sealing seat for sealing.

[0013] One end of the push plate is fitted with a compression spring, which is located inside the outer casing.

[0014] The actuating piece works in conjunction with the button.

[0015] The sealing ring and the button are interference fit.

[0016] The beneficial effects of this utility model are as follows: the reverse pressing actuation mechanism solves the problem of reasonable use of the switch overtravel; and the addition of a tile-shaped sealing ring to the switch button mating area for waterproof sealing solves the problem of dynamic waterproof sealing of the switch. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the reverse pressing actuator of this utility model; Figure 3 This is a schematic diagram of the working principle of this utility model; In the diagram: 1-flat spring assembly, 2-base assembly, 3-bow spring, 4-outer shell, 5-sealing seat, 6-sealing ring, 7-pressure ring, 8-button, 9-pressing piece, 10-compression spring, 11-rivet, 12-support frame, 13-wire. Detailed Implementation

[0018] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0019] like Figure 1 and 2As shown, first, the support frame 12 is installed into the base assembly 2 and riveted to fix it. Then, one end of the flat spring assembly 1 is hung on the U-shaped groove of the support frame 12, and the other end is suspended. Next, one end of the bow spring 3 is hung into the suspended end of the flat spring assembly 1, and the other end is hung into the V-shaped groove of the support frame 12. After the button 8 is installed into the housing 4, the sealing ring 6 is put into the button 8 and then pressed into the housing 4 with the retaining ring 7. Epoxy resin is applied to the outer edge of the retaining ring 7 where it mates with the housing 4 to seal it. Install the outer casing 4 into the base assembly 2 and apply epoxy resin adhesive to the mating surface to firmly bond them together; after welding the pins of the base assembly 2 with wires 13, install it into the sealing seat 5. First, apply epoxy resin adhesive to the upper part of the mating area between the base assembly 2 and the sealing seat 5 to seal it. Then, after inverting the switch, fill the lower part of the mating area between the base assembly 2 and the sealing seat (near the pin solder joint) with epoxy resin adhesive to seal it. Install the compression spring 10, the pressing piece 9, and the rivet 11 into the outer casing 4 in sequence and rivet them firmly.

[0020] Furthermore, the sealing ring 6 has a tile-like structure, which is simple and stable, has good processing performance, is easy to form, and is not easily deformed during assembly and use.

[0021] Specifically, the upper end of the sealing ring 6 is fitted with the button 8 with a large interference fit, and the lower end is tightly fitted with the outer shell 4 by the large compression of the pressure ring 7. When the switch is activated, only the middle part of the sealing ring 6 is moving, while the upper and lower ends are fixed, thus ensuring better dynamic sealing performance of the switch.

[0022] Specifically, the reverse pressing actuator with a "compression spring-pressing plate-rivet" structure is simple in structure, occupies little space, is easy to process and assemble, and has high reliability, making it worthy of promotion.

[0023] The working principle of this utility model is as follows: Figure 3 As shown, when the switch is in the free state, the left side of the pressing piece 9 is subjected to the upward spring force F of the compression spring 10. 复 Under the action of lever, the button 8 generates a downward pre-force F by levering the rivet 11 (point O) around its right middle part (i.e., the part of the switch without the reverse pressing actuation mechanism). 压 The action causes the switch unit to be in the pressed state. At this time, the switch lead C is connected to the lead NO and disconnected from the lead NC. When the right distal end of the pressing piece 9 is subjected to an upward external force F and overcomes the preload F of the compression spring 10 on the pressing piece 9, the action causes the switch unit to be in the pressed state. 预 When the button 8 is released by pressing the actuating piece 9, the switch lead C is disconnected from the lead NO and connected to NC. The compression spring 10 should be compressed and release its elastic potential energy. When the external pressure F is removed, the actuating piece 9 is again subjected to the upward elastic force F of the compression spring 10. 复 When button 8 is pressed again under the action, the switch lead C is disconnected from the lead NC and then connected to NO again. The spring 10 should extend and release its elastic potential energy, and the switch completes one action cycle.

Claims

1. A reverse-press type waterproof and sealed micro switch, comprising a base assembly (2) and a housing (4) mounted on the upper end face of the base assembly (2), characterized in that: The base assembly (2) has a support frame (12) on its end face, a flat spring assembly (1) on the support frame (12), and a bow spring (3) between the flat spring assembly (1) and the support frame (12); the outer shell (4) has a button (8), a sealing ring (6) with a tile-like structure between the button (8) and the outer shell (4), and is pressed by a pressure ring (7); the pin of the base assembly (2) is welded with a wire (13) and then installed into a sealing seat (5); the outer shell (4) also has a push plate (9), which is connected to the outer shell (4) by a rivet (11); the button (8), the push plate (9), the pressure spring (10), and the rivet (11) form a reverse pressing actuator mechanism.

2. The reverse-press type waterproof and sealed micro switch as described in claim 1, characterized in that: One end of the support frame (12) is provided with a U-shaped groove, and the other end is provided with a V-shaped groove.

3. The reverse-press type waterproof and sealed micro switch as described in claim 2, characterized in that: One end of the flat spring assembly (1) is hung on the U-shaped groove, and the other end is suspended.

4. The reverse-press type waterproof and sealed micro switch as described in claim 3, characterized in that: One end of the bow spring (3) is hooked into the suspended end of the flat spring assembly (1), and the other end is hooked into the V-groove.

5. The reverse-press type waterproof and sealed micro switch as described in claim 1, characterized in that: The pressure ring (7) and the outer shell (4) are sealed with epoxy resin adhesive.

6. The reverse-press type waterproof and sealed micro switch as described in claim 1, characterized in that: The outer shell (4) and the base assembly (2) are bonded together with epoxy resin adhesive.

7. The reverse-press type waterproof and sealed micro switch as described in claim 1, characterized in that: The base assembly (2) and the sealing seat (5) are sealed with epoxy resin glue at the upper end. After the switch is inverted, epoxy resin glue is poured into the lower end of the base assembly (2) and the sealing seat (5) for sealing.

8. The reverse-press type waterproof and sealed micro switch as described in claim 1, characterized in that: One end of the push plate (9) is fitted with a compression spring (10), which is located inside the outer casing (4).

9. The reverse-press type waterproof and sealed micro switch as described in claim 1, characterized in that: The pusher (9) works in conjunction with the button (8).

10. The reverse-press type waterproof and sealed micro switch as described in claim 1, characterized in that: The sealing ring (6) and the button (8) are interference fit.

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