Waterproof and dustproof touch switch

Abstract

The utility model discloses a waterproof and dustproof light touch switch, which comprises a base, a reset conduction piece, a waterproof shell, a circuit board and the like, and is characterized in that a first sealing ring is arranged between the base and the reset conduction piece to prevent water and dust from invading from the bottom; a second sealing ring arranged between the waterproof shell and the sensing piece prevents water and dust from invading from the top; the third sealing ring arranged outside the clamping groove in a sleeving mode prevents external water and dust from invading, triple sealing is conducted from the top, the bottom and the outside, and water and dust are effectively prevented from invading from all connecting positions. Meanwhile, the waterproof coating wrapped on the circuit board greatly reduces the fault probability of short circuit, poor contact and the like. The waterproof shell adopts a composite structure of the inner hard layer and the outer elastic layer, the inner hard layer provides strength, the outer elastic layer enhances buffering, and the stable connection of the elastic clamping block and the clamping groove between the base and the waterproof shell is combined, so that the stress is dispersed, and the structural stability and durability are improved.

Description

Technical Field

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

[0002] Currently, tactile switches, as a common electronic component, are widely used in the control panels of household appliances and industrial electronic instruments. In particular, household appliances and instruments such as washing machines, range hoods, and rice cookers come into contact with water, dust, and oil during use. Most tactile switches on the market have poor sealing between their internal components, making them susceptible to moisture and dust intrusion in humid or dusty environments, leading to short circuits, poor contact, and other malfunctions. Chinese utility model patent CN202221439598.0 discloses a waterproof tactile switch. By setting stacked springs on the inner wall of the bottom of the mounting groove and a waterproof membrane on the sealing cover, the waterproof membrane completely encapsulates the adhesive dots, thereby improving the waterproof rating of the switch body.

[0003] However, this patent has many limitations: there are no waterproof and dustproof measures at the connection port and the gap between the terminal and the mounting groove at the top of the sealing cover. Once water or dust enters, it may cause circuit failure. In terms of overall strength, the sealing cover is convex in shape. When subjected to external vibration or pressure, the connection between the convex part and the main body is prone to deformation and breakage due to stress concentration, which will damage the waterproof and dustproof function and expose and damage the internal components. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a waterproof and dustproof tactile switch, comprising a base, a circuit board, a reset conductor on the top of the base, and a first sealing ring between the base and the reset conductor; the circuit board is placed on top of the reset conductor, and the circuit board has electroplated through holes, and the entire circuit board is covered with a waterproof coating; a sensor is provided on the top of the circuit board, and the sensor cooperates with the reset conductor through the electroplated through holes;

[0005] The top of the sensor is provided with a waterproof shell, and a second sealing ring is provided between the waterproof shell and the sensor. The waterproof shell is movably connected to the base. The waterproof shell is a composite material consisting of an inner rigid layer and an outer elastic layer.

[0006] The present invention is further configured such that: the inner rigid layer is made of polycarbonate; and the outer elastic layer is made of silicone rubber.

[0007] The present invention is further configured such that: the base edge is provided with an elastic locking block and a limiting block, and the waterproof outer shell is provided with a locking groove that cooperates with the elastic locking block and a limiting groove that cooperates with the limiting block.

[0008] The present invention is further configured such that the outer sleeve of the card slot is provided with a third sealing ring.

[0009] The present invention is further configured such that: the first sealing ring, the second sealing ring, and the third sealing ring are all made of fluororubber.

[0010] The present invention is further configured such that: the bottom of the sensing element is provided with conductive contacts, and the conductive contacts are in contact with the corresponding contacts on the reset conductive element through electroplated through holes.

[0011] The present invention is further configured such that the waterproof coating is an epoxy resin-based waterproof coating.

[0012] In summary, this utility model has the following beneficial effects: This utility model discloses a waterproof and dustproof tactile switch, including a base, a reset conductor, a waterproof housing, and a circuit board. A first sealing ring between the base and the reset conductor prevents water and dust from entering from the bottom; a second sealing ring between the waterproof housing and the sensing element prevents water and dust from entering from the top; and a third sealing ring over the slot prevents external water and dust from entering. This triple sealing from the top, bottom, and outside effectively prevents water and dust from entering from each connection point. Simultaneously, the waterproof coating covering the circuit board significantly reduces the probability of short circuits and poor contact. The waterproof housing adopts a composite structure of an inner hard layer and an outer elastic layer. The inner hard layer provides strength, while the outer elastic layer enhances cushioning. Combined with the stable connection between the elastic block and the slot between the base and the waterproof housing, stress is dispersed, improving structural stability and durability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 3 yes Figure 2 A partial view diagram;

[0016] Figure 4 yes Figure 2 A partial view diagram;

[0017] Figure 5 This is a schematic diagram showing the location of the third sealing ring in this utility model.

[0018] Reference numerals: 1. Base; 2. Circuit board; 4. Electroplated through hole; 3. Sensing element; 5. Waterproof housing; 6. Reset conductive element; 7. Elastic locking block; 8. Limiting block; 9. Conductive contact; 10. First sealing ring; 20. Second sealing ring; 30. Third sealing ring; 40. Waterproof coating; 51. Inner hard layer; 52. Outer elastic layer; 70. Slot; 80. Limiting groove. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 2 As shown, this utility model discloses a waterproof and dustproof tactile switch, including a base 1, a circuit board 2, a reset conductor 6 provided on the top part of the base 1, and a first sealing ring 10 provided between the two. The sealing ring can effectively fill the gap and prevent water and dust from entering from between the base and the reset conductor, thus building the first line of defense against water and dust inside the switch.

[0021] like Figure 2 , Figure 4 As shown, the circuit board 2 is placed on top of the reset conductor 6. The circuit board 2 has electroplated through holes 4. The circuit board 2 is completely covered with a waterproof coating 40 of epoxy resin material. The molecular structure of epoxy resin material contains active groups such as epoxy groups and hydroxyl groups, which can form chemical bonds with the surface of various materials. It has strong adhesion and good waterproof performance, effectively blocking water vapor intrusion and fully protecting the circuits and electronic components on the circuit board 2, avoiding short circuits or poor contact caused by moisture and dust accumulation. The setting of the electroplated through holes 4 not only ensures the electrical connection between the sensor 3 and the reset conductor 6, but also prevents water and dust from penetrating from the holes because they are covered by the waterproof coating 40.

[0022] Reference Figure 2 The top of the sensor 3 is provided with a waterproof housing 5, and the second sealing ring 20 is disposed between the waterproof housing 5 and the sensor 3. Its main function is to further enhance the waterproof and dustproof effect. It can tightly fit the contact part between the waterproof housing 5 and the sensor 3, effectively fill the tiny gaps that may exist between them, prevent external pollutants such as water vapor and dust from entering the switch, and protect the sensor.

[0023] like Figure 1 , Figure 2 , Figure 5 As shown, the base 1 is provided with an elastic locking block 7 and a limiting block 8 on its edge. The waterproof shell 5 is provided with a locking groove 70 that cooperates with the elastic locking block 7 and a limiting groove 80 that cooperates with the limiting block 8. The base 1 and the waterproof shell 5 are connected by a snap-fit, which makes the present invention more precise and faster to operate when assembling or when the switch malfunctions and needs to be repaired or replaced.

[0024] Reference Figure 2 , Figure 3The waterproof outer shell 5 is composed of an inner rigid layer 51 and an outer elastic layer 52. The inner rigid layer 51 is made of polycarbonate, which has high strength and impact resistance, providing all-round protection for internal components and reducing the risk of damage caused by external forces. The outer elastic layer 52 is made of silicone rubber, which has excellent flexibility and sealing properties, can fit tightly to the components, greatly enhance the waterproof and dustproof effect, isolate water and dust and other pollutants, and can also cushion and absorb shock.

[0025] Reference Figure 1 , Figure 5 The slot 70 is fitted with a third sealing ring 30, and the first sealing ring 10, the second sealing ring 20 and the third sealing ring 30 are all made of fluororubber. Fluororubber can maintain stable physical properties and sealing performance in high temperature environments, and has outstanding aging resistance. The sealing ring will not soften or deform due to long-term use or temperature rise.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A waterproof and dustproof tactile switch comprising a base (1) and a circuit board (2), characterized in that: The base (1) top is provided with reset conducting part (6), the base (1) is equipped with first sealing ring (10) with reset conducting part (6);The circuit board (2) is placed on the top of reset conducting part (6), the circuit board (2) is equipped with electroplating through hole (4), and the whole circuit board (2) is wrapped waterproof coating (40);The circuit board (2) top is equipped with sensing element (3), and the sensing element (3) is matched with reset conducting part (6) through electroplating through hole (4); The sensing element (3) top is equipped with waterproof shell (5), the waterproof shell (5) is equipped with second sealing ring (20) with sensing element (3), the waterproof shell (5) is movably connected with base (1), the waterproof shell (5) is composed of inner hard layer (51) and outer elastic layer (52).

2. The waterproof and dustproof tactile switch according to claim 1, characterized in that: The inner hard layer (51) is made of polycarbonate;The outer elastic layer (52) is made of silicone rubber.

3. The waterproof and dustproof tactile switch according to claim 2, characterized in that: The base (1) edge is equipped with elastic clamping block (7) and limiting block (8), the waterproof shell (5) is equipped with clamping groove (70) matched with elastic clamping block (7) and limiting groove (80) matched with limiting block (8).

4. The waterproof and dustproof tactile switch according to claim 3, characterized in that: The clamping groove (70) is equipped with third sealing ring (30) outside.

5. The waterproof and dustproof tactile switch according to claim 4, characterized in that: The first sealing ring (10), second sealing ring (20) and third sealing ring (30) are made of fluorine rubber.

6. The waterproof and dustproof tactile switch according to claim 5, characterized in that: The sensing element (3) bottom is equipped with conductive contact (9), and the conductive contact (9) is contacted with the corresponding contact on reset conducting part (6) through electroplating through hole (4).

7. The waterproof and dustproof tactile switch according to claim 6, characterized in that: The waterproof coating (40) is made of epoxy resin material.

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