A waterproof and dustproof push button switch

Abstract

This utility model discloses a waterproof and dustproof push-button switch, relating to the field of switch technology, overcoming the shortcomings of existing technologies such as limited sealing effect. The soft sleeve body passes through a through hole in a sealing plate, with the sleeve surface located inside the side cavity. The sealing plate presses and fixes the sleeve surface to a partition and covers the sealed opening. Moving and stationary contacts pass sequentially through the sealing plate from the side cavity and are inserted into the soft sleeve body. The moving contact is made of elastic metal material and is initially spaced apart from the stationary contact. A locking mechanism is located outside the soft sleeve body. When the locking mechanism is activated, it presses against the soft sleeve, deforming it and causing the moving contact to bend and press down until it contacts the stationary contact for conduction. This isolates water, dust, and other external impurities from the outside of the soft sleeve, effectively preventing them from entering the moving and stationary contact areas inside the side cavity. This forms a dual protective structure of physical isolation and elastic sealing, ensuring reliable electrical connection performance of the switch even in extreme environments such as underwater, while simultaneously improving the waterproof and dustproof rating.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, and in particular to a waterproof and dustproof push button switch. Background Technology

[0002] In many fields such as industrial automation control, smart homes, and outdoor equipment, push-button switches are commonly used human-machine interface components, and their reliability and service life directly affect the overall performance of the equipment. Currently, most push-button switches on the market employ simple housing sealing structures, such as placing a rubber sealing ring between the button and the housing, or applying waterproof adhesive to the terminals for protection. However, these conventional waterproof and dustproof technologies have significant drawbacks: firstly, the sealing ring itself has limited sealing effectiveness and is easily deformed or aged by external forces, leading to seal failure. Under long-term vibration, high temperature, or low temperature environments, the waterproof and dustproof performance drops sharply. Secondly, the internal contact structure of existing switches is mostly placed directly inside the housing. When moisture, dust, and other impurities penetrate the sealing ring through tiny gaps and enter the switch, it not only causes poor contact between the moving and stationary contacts, affecting the switch's normal conduction function, but may also cause short circuits and other malfunctions, reducing the switch's service life and even leading to safety accidents. Especially in special application scenarios such as underwater equipment and outdoor devices in humid environments, existing push-button switches cannot meet the requirements for long-term stable operation and waterproof and dustproof protection. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies, such as limited sealing effect, which makes it difficult to meet the needs of use in extreme environments such as underwater. This invention provides a waterproof and dustproof push button switch.

[0004] The technical solution of this utility model includes a shell, a top plate, a sealing plate, a soft sleeve, a moving contact piece, and a stationary contact piece. The shell has an installation cavity and a side cavity, each with only one opening. The two cavities are separated by a partition with a through hole. A locking mechanism is provided on the top plate, which enters the installation cavity from the outside and is fixedly covered at the opening of the installation cavity. The soft sleeve includes a sleeve surface, a sleeve opening, and a hollow sleeve body. The sleeve opening is located at the entry / exit position of the sleeve body and is located on the sleeve surface. The sleeve body passes through the through hole, and the sleeve surface is located in the side cavity. The sealing plate presses and fixes the sleeve surface to the partition and covers and seals the sleeve opening. The moving contact piece and the stationary contact piece pass through the sealing plate sequentially from the side cavity and are inserted into the sleeve body of the soft sleeve. The moving contact piece is made of elastic metal material and is initially spaced apart from the stationary contact piece. The locking mechanism is located on the outside of the sleeve body of the soft sleeve. When the locking mechanism is activated, it is pressed against the soft sleeve to deform it, causing the moving contact piece to bend and press down until it contacts and conducts electricity with the stationary contact piece.

[0005] The above technical solution uses a housing to separate an independent mounting cavity and a side cavity. A soft sleeve is used to press and fix the sleeve surface to the partition, isolating water, dust and other external impurities on the outside of the soft sleeve, effectively preventing them from entering the moving and stationary contact areas inside the side cavity. The locking mechanism drives the elastic metal moving contact to bend and conduct through the deformation of the soft sleeve, avoiding the gap defects of traditional rigid contact structures. This forms a dual protection structure of physical isolation and elastic sealing, ensuring that the switch can maintain reliable electrical connection performance in extreme environments such as underwater, while improving the waterproof and dustproof rating.

[0006] In one possible design, the side cavity on the outside of the sealing plate is filled with sealant, which completely covers the roots of the moving and stationary contacts within the side cavity.

[0007] The above design eliminates the assembly gap between the contact plate and the sealing plate, forming a fully enclosed sealed space. This further blocks the path of water and dust infiltration through the terminal mounting holes, complementing the soft sleeve sealing structure and enhancing the sealing performance inside the side cavity. It is especially suitable for environments with long-term immersion or high-pressure water rinsing.

[0008] In one possible design, the sleeve is made of silicone or rubber, and its body fits tightly against the inner wall of the through hole.

[0009] The above design uses a soft sleeve made of silicone or rubber, which utilizes its elastic deformation properties to achieve a tight fit between the sleeve body and the inner wall of the through hole. This allows the pressure to be transmitted through flexible deformation during pressing, and also maintains tight contact between the sealing surfaces when not pressed, ensuring the dynamic sealing reliability of the through hole of the partition.

[0010] In one possible design, the locking mechanism includes a pressure block, a spring, and a button assembly. The spring is connected below the button assembly, and the bottom of the spring rests against the pressure block, which is located on the outside of the soft sleeve.

[0011] With the above design, the locking mechanism uses a spring to achieve elastic reset of the button assembly, and works in conjunction with the pressure block to position the soft sleeve pressing area, so that the pressing force is evenly applied to the surface of the soft sleeve, thereby improving the reliability of the action. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the present invention;

[0014] Figure 3 This is an exploded view of the present invention;

[0015] Figure 4 This is an exploded cross-sectional view of the shell, soft sleeve, and pressure block of this utility model;

[0016] The components are as follows: 1. Housing; 11. Mounting cavity; 12. Side cavity; 13. Partition plate; 131. Through hole; 2. Top plate; 21. Button assembly; 22. Spring; 23. Pressure block; 3. Sealing plate; 4. Soft sleeve; 41. Sleeve surface; 42. Sleeve body; 43. Sleeve opening; 5. Moving contact piece; 6. Stationary contact piece; 7. Sealant. Detailed Implementation

[0017] like Figures 1 to 4 The waterproof and dustproof push-button switch shown includes a housing 1, a top plate 2, a sealing plate 3, a flexible sleeve 4, a moving contact 5, and a stationary contact 6. The housing 1 is integrally molded, and its interior is separated into a mounting cavity 11 and a side cavity 12 by a partition 13. The openings of the mounting cavity 11 and the side cavity 12 face different directions, and each cavity has only one opening to facilitate the installation of subsequent components. A through hole 131 is provided on the partition 13, and the diameter of the through hole 131 is adapted to the body 42 of the flexible sleeve 4. A locking mechanism is provided on the top plate 2, which enters the mounting cavity 11 from the outside of the top plate 2. The top plate 2 is fixed to the opening of the mounting cavity 11 by screws, clips, or glue to ensure a firm seal. The soft sleeve 4 includes a sleeve surface 41, a sleeve opening 43, and a hollow sleeve body 42. The sleeve opening 43 is located at the inlet / outlet position of the sleeve body 42 and is located on the sleeve surface 41. The sleeve body 42 of the soft sleeve 4 is passed through the through hole 131 on the partition 13, so that the sleeve surface 41 is located in the side cavity 12. Then, the sealing plate 3 is covered at the opening of the side cavity 12 and the sealing plate 3 is fixedly connected to the shell 1 by means of buckles or glue sealing. During the tightening process, the sealing plate 3 tightly presses and fixes the sleeve surface 41 to the partition 13, while covering and sealing the sleeve opening 43, so as to achieve a sealed connection between the soft sleeve 4, the partition 13, and the sealing plate 3. The moving contact 5 and the stationary contact 6 pass sequentially through the sealing plate 3 from the side cavity 12 and are inserted into the sleeve 42 of the soft sleeve 4. The moving contact 5 is made of an elastic metal material, such as beryllium bronze or phosphor bronze, and is formed by stamping, bending and other processing techniques. During the installation of the contact, after the contact is fitted with the soft sleeve 4, it should be ensured that there is a certain gap between the moving contact 5 and the stationary contact 6 in the initial state, and that the positional accuracy of the two meets the electrical conduction requirements. The locking mechanism is located on the outside of the sleeve 42 of the soft sleeve 4. When the button is pressed, the locking mechanism is pressed against the soft sleeve 4 to deform it, causing the moving contact 5 to bend and press down until it contacts the stationary contact 6 to conduct electricity.

[0018] To further enhance the waterproof rating, sealant 7 is filled into the side cavity 12 outside the sealing plate 3. The sealant 7 completely covers the roots of the moving contact 5 and stationary contact 6, as well as the wires within the side cavity 12, preventing moisture or dust from seeping in through the contact installation gaps. The sealant 7 is an electronic adhesive with good waterproof, dustproof, and insulating properties, such as epoxy resin or silicone rubber. After installing the moving contact 5, stationary contact 6, and sealing plate 3, sealant 7 is filled from the outside of the sealing plate 3 into the side cavity 12, ensuring that the sealant 7 completely covers the roots of the moving contact 5 and stationary contact 6, the connecting wire positions, and the connection between the sealing plate 3 and the housing 1. During filling, the amount of sealant and the filling speed are controlled to avoid air bubbles. After the sealant 7 cures, a fully sealed space is formed.

[0019] The soft sleeve 4 is made of silicone or rubber, and its body 42 fits tightly against the inner wall of the through hole 131. The soft sleeve 4 is manufactured using a molding process to ensure the dimensional accuracy and surface quality of the sleeve surface 41, sleeve opening 43, and sleeve body 42.

[0020] The locking mechanism includes a pressure block 23, a spring 22, and a button assembly 21. The spring 22 is connected below the button assembly 21, and the bottom of the spring 22 rests against the pressure block 23. The pressure block 23 is located on the outside of the sleeve body 42 of the soft sleeve 4. The button assembly 21 includes components such as a button and a pawl, which are existing technologies and will not be described in detail here. Mounting holes are pre-drilled in the top plate 2 for mounting the button assembly 21. A guide cylinder at the bottom of the button assembly 21 passes through the mounting holes and is slidably connected to the top plate 2. The spring 22 is installed inside the guide cylinder, with one end abutting against the inside of the guide cylinder and the other end abutting against the upper surface of the pressure block 23. The elastic coefficient of the spring 22 is precisely selected and adjusted according to the required pressing force of the switch. The pressure block 23 is fixed to the bottom of the spring 22 by welding, threaded connection, or adhesive bonding. The position of the pressure block 23 precisely corresponds to the outside of the sleeve body 42 of the soft sleeve 4, and a guide structure guides the rise and fall of the pressure block 23 to ensure accurate application to the soft sleeve 4 when pressed.

[0021] The specific working principle of the switch in this application is as follows:

[0022] In the initial state, the button assembly 21 is in its natural state, the spring 22 is in its normal extended state, and the pressure block 23 maintains slight contact with the soft sleeve 4 body 42 without applying pressure. At this time, the moving contact 5 is held apart from the stationary contact 6 by its own elasticity, and the two are in an open state, so the switching circuit is not connected.

[0023] When the switch needs to be turned on, a finger presses the button assembly 21. The button assembly 21 moves downward against the elastic force of the spring 22, causing the spring 22 to compress. The spring 22 then transmits the pressing force to the pressure block 23. The pressure block 23, under pressure, presses down on the soft sleeve 4. Due to its good elasticity, the soft sleeve 4 deforms under the pressure of the pressure block 23. The deformed soft sleeve 4 pushes the moving contact 5 to bend and press down. As the pressing depth increases, the end of the moving contact 5 gradually approaches the stationary contact 6 and eventually comes into contact with it, forming a circuit between the moving contact 5 and the stationary contact 6, thus completing the switch closing operation.

[0024] When the finger presses the button assembly 21 again, the spring force of the spring 22 is released, pushing the button assembly 21 upward to reset. The pressure block 23 also moves upward, and the pressure on the soft sleeve 4 disappears. The soft sleeve 4 returns to its original shape under its own elasticity. The moving contact 5 loses the pushing force of the soft sleeve 4 and rebounds upward by its own elasticity, gradually separating from the stationary contact 6 and returning to the initial interval state. The switch circuit is disconnected, realizing the switch disconnection operation.

[0025] Throughout the entire operation, due to the partition structure of the housing 1, the sealing effect of the soft sleeve 4, and the filling of the sealant 7, external impurities such as water and dust are always kept outside the contact area of ​​the internal contact piece of the switch, effectively ensuring the normal working environment of the moving contact piece 5 and the stationary contact piece 6. Even in extreme environments such as underwater, the switch can be ensured to perform stable and reliable conduction and disconnection operations.

Claims

1. A waterproof and dustproof push button switch, characterized in that: The device includes a housing (1), a top plate (2), a sealing plate (3), a soft sleeve (4), a moving contact piece (5), and a stationary contact piece (6). The housing (1) has an installation cavity (11) and a side cavity (12). The installation cavity (11) and the side cavity (12) each have only one opening. The two cavities are separated by a partition plate (13), which has a through hole (131). The top plate (2) is provided with a locking mechanism that enters the installation cavity (11) from the outside. The top plate (2) is fixedly covering the opening of the installation cavity (11). The soft sleeve (4) includes a sleeve surface (41), a sleeve opening (43), and a hollow sleeve body (42). The sleeve opening (43) is located at the entry and exit position of the sleeve body (42) and... Located on the sleeve surface (41), the sleeve body (42) passes through the through hole (131), the sleeve surface (41) is located in the side cavity (12), the sealing plate (3) presses and fixes the sleeve surface (41) on the partition plate (13) and covers the sealed sleeve opening (43); the moving contact piece (5) and the stationary contact piece (6) pass through the sealing plate (3) from the side cavity (12) and are inserted into the sleeve body (42) of the soft sleeve (4), the moving contact piece (5) is made of elastic metal material and is spaced apart from the stationary contact piece (6) in the initial state; the locking mechanism is located outside the sleeve body (42) of the soft sleeve (4), when the locking mechanism is activated, the locking mechanism is pressed against the soft sleeve (4) to deform it, and drives the moving contact piece (5) to bend down and contact the stationary contact piece (6) to conduct.

2. The waterproof and dustproof push button switch according to claim 1, characterized in that: The side cavity (12) outside the sealing plate (3) is filled with sealant (7), which completely covers the roots of the moving contact (5) and the stationary contact (6) inside the side cavity (12).

3. The waterproof and dustproof push-button switch according to claim 1 or 2, characterized in that: The soft sleeve (4) is made of silicone or rubber, and its body (42) fits tightly against the inner wall of the through hole (131).

4. The waterproof and dustproof push button switch according to claim 1 or 2, characterized in that: The locking mechanism includes a pressure block (23), a spring (22) and a button assembly (21). The button assembly (21) is connected to the spring (22) below. The bottom of the spring (22) rests against the pressure block (23). The pressure block (23) is located outside the sleeve body (42) of the soft sleeve (4).

Images