Sealing structure of glue pouring type waterproof switch

Abstract

A sealing structure of a glue pouring type waterproof switch comprises a switch body and a waterproof shell, a base used for fixing pins is arranged at an opening of the switch body, the base is connected with the inner wall of the switch body in a sealed mode, a reinforcing layer used for improving glue pouring adhesive force during glue pouring is arranged on the base, and the waterproof shell is arranged on the reinforcing layer. The waterproof shell is obtained through glue pouring and is directly formed on the base, a reinforcing groove for pouring sealant to flow in when the waterproof shell is formed is formed between the reinforcing layer and the base, and the reinforcing groove and the base are arranged in parallel. The waterproof structure has the advantages that the waterproof shell is directly formed on the base through the glue filling technology, interface seamless combination can be achieved, and the hidden danger of gap water seepage existing in a traditional assembly type sealing structure is eliminated. The reinforcing grooves arranged in parallel increase the contact area of the pouring sealant, and reduce the problem of shear stress concentration caused by thermal expansion and cold contraction in the curing process through direction optimization.

Description

Technical Field

[0001] This utility model relates to a waterproof switch, and more particularly to a sealing structure for a potting-type waterproof switch. Background Technology

[0002] Waterproof switches with potting compound are widely used in various electronic devices requiring moisture and water resistance, such as control panels for household appliances, automotive electronic components, outdoor lighting equipment, and industrial instruments. The core technology involves creating a sealed structure using potting compound to isolate the switch from external environmental corrosion. In practice, a split-type design is typically used. Operators first fix the terminals to the pre-drilled opening in the switch body, then mechanically join the waterproof housing to the switch body to form a sealed cavity. Liquid epoxy resin or silicone is then injected through a dedicated potting hole. After the compound cures, it forms a waterproof layer encapsulating the terminals. This process achieves both electrical insulation and physical protection, but it requires high precision in assembly and strict control over the potting compound quality.

[0003] Chinese patent document CN212810138U discloses a miniature waterproof micro switch, including a switch body and a waterproof shell. The switch body has an opening, and a base for fixing a terminal block is provided at the opening. The base is sealed to the inner wall of the switch body. One end of the waterproof shell is spliced ​​with the opening. A cover plate is integrally formed inside the waterproof shell near the splice. After the waterproof shell and the switch body are spliced, a glue-filling space for glue filling is formed between the cover plate and the base. The cover plate has a glue-filling hole and a through hole for the terminal block to pass through. The base has a reinforcing layer protruding from the end facing the waterproof shell to improve the adhesion of the glue during glue filling. The two sides of the reinforcing layer extend towards the waterproof shell to form reinforcing ribs.

[0004] Although the above solution optimizes the adhesion of the potting compound by setting a vertically protruding reinforcement layer with reinforcing ribs, its structure still has significant defects: First, the waterproof shell and the switch body are connected by a splice, and the interface between the two is only sealed by potting compound. Under long-term mechanical vibration or temperature deformation, the interface is prone to peeling, leading to the risk of seal failure. Second, the reinforcement layer adopts a vertically protruding design. When the adhesive layer develops initial cracks due to stress concentration, the cracks will bear shear stress when they extend to the root of the reinforcement layer. Since the vertically protruding structure lacks shear support, it will accelerate the extension of cracks along the edge of the reinforcement ribs, causing the waterproof adhesive layer to form a through crack. Moisture can quickly penetrate into the inside of the switch along the crack and cause a short circuit fault. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a sealing structure for a potting-type waterproof switch that enhances the sealing effect at the pins of a micro switch.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sealing structure for a potting-type waterproof switch, comprising a switch body and a waterproof shell. The switch body has a base at its opening for fixing pins. The base is sealed to the inner wall of the switch body. A reinforcing layer is provided on the base to improve the adhesion of the potting compound during potting. The waterproof shell is obtained by potting and is directly molded on the base. A reinforcing groove is provided between the reinforcing layer and the base for the potting compound to flow in during the molding of the waterproof shell. The reinforcing groove is parallel to the base.

[0007] The beneficial effects of this invention are as follows: By directly molding a waterproof shell onto the base using a potting process, a seamless interface can be achieved, eliminating the risk of water leakage from gaps present in traditional assembled sealing structures. The parallel reinforcing grooves increase the contact area of ​​the potting compound while optimizing the direction to reduce shear stress concentration caused by thermal expansion and contraction during curing. For example, when the potting compound shrinks during the curing stage, the reinforcing grooves parallel to the base allow stress to be released evenly along its length, preventing the propagation of microcracks caused by stress concentration perpendicular to the base. As a preferred approach, the reinforcing grooves can be designed as a continuous wave-shaped structure, forming multiple stress buffer sections parallel to the base. This maintains the continuity of the potting compound's flow path and disperses shear stress through the alternating distribution of peaks and troughs, further reducing the probability of cracking.

[0008] Furthermore, the reinforcing layer includes a support seat protruding from the center of the base and a reinforcing plate disposed on the support seat and extending to both sides perpendicular to the pin distribution direction. The reinforcing groove is located between the reinforcing plate and the base. After the potting compound has cured, the reinforcing plate is placed on top of it to prevent the waterproof shell from falling off the base.

[0009] This structure forms a three-dimensional support frame through the support base, and the suspended area formed by the reinforcing plate and the base provides three-dimensional flow space for the potting compound. The end of the reinforcing plate forms a mechanical locking structure with the cured potting compound. When the waterproof shell is subjected to external pulling force, the hook-shaped interface formed by the edge of the reinforcing plate and the potting compound can resist vertical peeling force. As a preferred method, the end of the reinforcing plate can be designed as a barb-shaped structure with triangular ribs on the inner side of the barb. During the potting process, the adhesive seeps into the cavity formed by the barb and the ribs, forming a multi-point anchoring structure after curing, thus improving the resistance to pull-out.

[0010] Furthermore, the reinforcing plate and the support base are flush with each other on the end face perpendicular to the pin distribution direction.

[0011] This alignment design creates a continuous, flat boundary for the reinforcement layer, ensuring a uniform wetting interface as the potting compound flows. The flush end faces prevent eddies or bubble buildup during flow, and the flat boundary conditions facilitate stable filling of the compound along the predetermined direction. As a preferred method, a guide ramp of a certain width is provided on both sides of the support base, forming a continuous transition surface with the reinforcement plate end face. This guides the compound to flow smoothly when encountering the pin array, reducing filling defects caused by localized turbulence.

[0012] Furthermore, the extension direction of the reinforcement groove is consistent with the pin distribution direction, and a diversion block protruding from the support base is provided at the center of each reinforcement groove. The diversion block is used to guide the potting compound into the reinforcement groove located on both sides of it.

[0013] The flow divider block alters the traditional adhesive distribution pattern of straight flow channels, actively guiding the adhesive to the reinforcement tanks on both sides through a raised structure. When injection pressure is applied to the front end of the flow divider block, the adhesive is forcibly split into two streams, entering the left and right reinforcement tanks respectively, ensuring symmetrical filling. As a preferred approach, the flow divider block can adopt an arrow-shaped structure, with its tip pointing towards the injection inlet. The side flanges and the side walls of the reinforcement tanks form a tapering flow channel, reducing flow resistance while ensuring effective flow distribution and preventing adhesive stagnation behind the flow divider block.

[0014] Furthermore, the distance by which the diverting block protrudes from the support seat is less than the depth of the reinforcing groove.

[0015] This dimensional relationship ensures a reasonable distance between the top of the diversion block and the top of the reinforcement tank, guaranteeing both diversion effectiveness and avoiding dead zones. When the diversion block protrudes to 2 / 3 of the tank depth, the adhesive can form a secondary diversion channel between the top of the diversion block and the top of the tank, enhancing the adhesive's longitudinal penetration ability within the reinforcement tank. For example, in a 3mm deep reinforcement tank, a 2mm high diversion block is installed, with a 1mm gap between its top and the top of the tank. This gap guides some adhesive upwards to wet the inner wall of the reinforcement plate, forming a multi-layer adhesive film structure.

[0016] Furthermore, a cover plate is provided on both end faces of the reinforcing plate along the pin distribution direction. The cover plate includes a reinforcing part that protrudes from the reinforcing plate along the pin distribution direction and a connecting part that extends perpendicular to the end face of the reinforcing plate. A second reinforcing groove is formed between the reinforcing part and the base.

[0017] The L-shaped structure of the cover plate forms a three-dimensional protection at the end of the reinforcing plate, with the reinforcement extending to cover the edge of the potting compound, and the connecting part providing lateral support. The second reinforcing groove forms an orthogonally distributed network of adhesive with the original reinforcing groove. When microcracks appear in the second reinforcing groove, the perpendicularly intersecting reinforcing grooves can block the crack propagation path. As a preferred embodiment, the end of the reinforcement can be provided with an arc-shaped flange, forming a crescent-shaped second reinforcing groove with the base. This arc-shaped structure can evenly distribute stress from different directions, while increasing the contact perimeter between the adhesive and the metal part.

[0018] Furthermore, the end face of the reinforcing part perpendicular to the pin distribution direction is divided into a straight section close to the second reinforcing groove and a diversion section away from the second reinforcing groove, and the diversion section is inclined; the end face of the connecting part and the reinforcing part corresponding to the straight section and the diversion section is provided with a return section with an inclination angle greater than that of the diversion section.

[0019] This composite inclined surface design creates a dynamic flow field control structure. The straight section ensures the initial flow direction of the adhesive is stable, the inclined diversion section guides the adhesive to diffuse outward, and the large-angle backflow section generates a reverse pressure gradient to prevent the adhesive from flowing back. The combination of these two elements can create local eddies in the later stages of dispensing, promoting the penetration and filling of complex corners by the adhesive.

[0020] Furthermore, an arc-shaped guide surface and an oblique guide surface are provided on the end faces of the reinforcing part and the connecting part on both sides along the direction of the second reinforcing groove.

[0021] The curved guide surface can smoothly change the direction of adhesive flow, while the angled guide surface provides directional guidance. When the adhesive flows through this combined guide structure, the curved surface reduces flow energy loss, and the angled surface precisely guides the adhesive to the far end of the second reinforcement tank.

[0022] Furthermore, the extension direction of the second reinforcement groove is perpendicular to the pin distribution direction, and a second diversion block protruding from the support base is provided at the center of each second reinforcement groove. The second diversion block is used to guide the potting compound to the second reinforcement groove and the reinforcement groove located on both sides of it.

[0023] The orthogonally distributed second distribution blocks form a three-dimensional distribution network with the main distribution blocks, ensuring that the adhesive is evenly distributed in both longitudinal and transverse directions. The second distribution block can adopt a pyramidal structure, with multiple slopes corresponding to multiple flow directions, achieving radial filling of the adhesive under the action of dispensing pressure. Attached Figure Description

[0024] Figure 1 This is an isometric view of an embodiment of the present utility model;

[0025] Figure 2 This is an exploded view of an embodiment of the present utility model;

[0026] Figure 3This is an axonometric view of the base of an embodiment of this utility model;

[0027] Figure 4 This is a front view of the base according to an embodiment of the present utility model;

[0028] Figure 5 This is a side view of the base of an embodiment of the present utility model;

[0029] Figure 6 This is a partial enlarged view of the cover plate in an embodiment of this utility model. Detailed Implementation

[0030] This utility model embodiment provides a sealing structure for a potting-type waterproof switch, as shown below. Figure 1-6 As shown: The device includes a switch body 1 and a waterproof shell 2 formed by potting. The switch body 1 has a base 3 at its opening, which forms a sealed connection structure 31 with the inner wall of the switch body. A reinforcing layer 4 is provided on the surface of the base 3 to enhance the adhesion of the potting compound. A reinforcing groove 5, parallel to the base, is formed between the base 3 and the reinforcing layer 4, providing a flow channel for the potting compound during the potting process.

[0031] The reinforcing layer 4 consists of a support base 41 located at the center of the base 3 and reinforcing plates 42 extending on both sides. The two reinforcing plates 42 extend towards both sides perpendicular to the distribution direction of the pins 6. The reinforcing groove 51 formed between the reinforcing plate 42 and the base 3 is covered by the reinforcing plate 42 after the potting compound has cured, forming a snap-fit ​​structure to prevent the waterproof shell 2 from falling off. The support base 41 and the reinforcing plate 42 form flush end faces 411 at their end faces perpendicular to the pins 6 to ensure uniform flow of the adhesive.

[0032] A raised cylindrical diverter block 511 is provided at the center of the reinforcing groove 51 in the extending direction (consistent with the distribution direction of the pins 6). The height of the diverter block 511 is less than the depth of the reinforcing groove 51, which can divert the potting compound to the two reinforcing grooves 51 on both sides. Both end faces of the reinforcing plate 42 are provided with L-shaped cover plates 7. Each cover plate 7 includes a reinforcing part 71 protruding along the direction of the pins 6 and a vertically extending connecting part 72. A second reinforcing groove 8 is formed between the reinforcing part 71 and the base 3. The end face of the reinforcing part 71 is composed of a straight section 711 and an inclined diverting section 712. The connecting part 72 is correspondingly provided with a return section 721 with a larger inclination angle, forming a flow guiding structure.

[0033] The cover plate 7 has an arc-shaped guide surface 73 and an angled guide surface 74 on both sides. The second reinforcement groove 8 has a conical second diverter block 81 in the center, which can divert the colloid to the second reinforcement groove 8 and the reinforcement groove 51. The cooperation between each guide surface and the diverter block ensures that the potting compound evenly fills all the reinforcement grooves.

[0034] Working principle: After injection, the potting compound first contacts the diverter block 511 on the support base 41 and is evenly distributed to the two side reinforcement grooves 51. During the flow, the diverter block 81 introduces part of the compound into the second reinforcement groove 8. The compound is blocked by the reinforcement plate 42 during flow, forming vortices along the arc-shaped guide surface 73 and the angled guide surface 74, ensuring full contact between the compound and the base 3. After curing, the waterproof shell 2 is mechanically interlocked with the reinforcement plate 42 through the fastening structure 421. At the same time, the compound in the reinforcement groove 5 and the second reinforcement groove 8 forms a multi-directional anchoring structure, jointly preventing the waterproof shell 2 from falling off.

[0035] As a preferred method, the wire is connected to pin 6 before the glue is applied. After the glue is applied and cured, the wire will naturally remain outside the waterproof shell 2 and will not leave any gap for water vapor to enter.

[0036] It should be noted that the shape of the waterproof shell 2 depends on the shape of the mold when the potting compound is injected. When the potting compound is injected, the end face of the base 3 facing the reinforcing layer 4 is filled with potting compound, and then cured to form the waterproof shell 2.

[0037] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A sealing structure for a potting-type waterproof switch, comprising a switch body and a waterproof shell, wherein the switch body has a base for fixing pins at an opening, the base is sealed to the inner wall of the switch body, and the base is provided with a reinforcing layer for improving the adhesion of the potting compound during potting, characterized in that: The waterproof shell is obtained by potting and directly molded on the base. A reinforcement groove is provided between the reinforcement layer and the base for the potting adhesive to flow in during the molding of the waterproof shell.

2. The sealing structure of the potting-type waterproof switch according to claim 1, characterized in that: The reinforcing layer includes a support base protruding from the center of the base and a reinforcing plate disposed on the support base and extending to both sides perpendicular to the pin distribution direction. The reinforcing groove is located between the reinforcing plate and the base. After the potting compound cures, the reinforcing plate is placed on top to prevent the waterproof shell from falling off the base.

3. The sealing structure of the potting-type waterproof switch according to claim 2, characterized in that: The reinforcing plate and the support base are flush with each other on the end face perpendicular to the direction of the pin distribution.

4. The sealing structure of the potting-type waterproof switch according to claim 2, characterized in that: The extension direction of the reinforcement groove is consistent with the distribution direction of the pins. Each reinforcement groove has a diversion block protruding from the support base at its center. The diversion block is used to guide the potting compound into the reinforcement groove located on both sides of it.

5. The sealing structure of the potting-type waterproof switch according to claim 4, characterized in that: The distance by which the diversion block protrudes from the support base is less than the depth of the reinforcement groove.

6. The sealing structure of the potting-type waterproof switch according to claim 2, characterized in that: The reinforcing plate is provided with a cover plate on both end faces along the pin distribution direction. The cover plate includes a reinforcing part that protrudes from the reinforcing plate along the pin distribution direction and a connecting part that extends perpendicular to the end face of the reinforcing plate. A second reinforcing groove is formed between the reinforcing part and the base.

7. The sealing structure of the potting-type waterproof switch according to claim 6, characterized in that: The end face of the reinforcing part perpendicular to the pin distribution direction is divided into a straight section close to the second reinforcing groove and a diversion section away from the second reinforcing groove. The diversion section is inclined. The end face of the connecting part and the reinforcing part corresponding to the straight section and the diversion section is provided with a return section with an inclination angle greater than that of the diversion section.

8. The sealing structure of the potting-type waterproof switch according to claim 7, characterized in that: An arc-shaped guide surface and an oblique guide surface are provided on the end faces of the reinforcing part and the connecting part on both sides along the direction of the second reinforcing groove.

9. The sealing structure of the potting-type waterproof switch according to claim 6, characterized in that: The extension direction of the second reinforcement groove is perpendicular to the pin distribution direction. A second diversion block protruding from the support base is provided at the center of each second reinforcement groove. The second diversion block is used to guide the potting compound to the second reinforcement groove and the reinforcement groove located on both sides of it.

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