Glue pouring type waterproof switch

Abstract

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, and a reinforcing layer used for improving glue pouring adhesive force during glue pouring is arranged on the base. The waterproof shell is formed by pouring a pouring sealant on the base and curing the pouring sealant, a reinforcing groove for the pouring sealant to flow in when the waterproof shell is formed is formed between the reinforcing layer and the base, and the extending direction of the reinforcing groove is consistent with the arrangement direction of the pins. The waterproof structure has the beneficial effects that the waterproof shell is directly formed on the base through a glue pouring process, seamless interface 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] The present invention relates to a waterproof switch, in particular to a glue-filled waterproof switch. Background Art

[0002] Glue-potting waterproof switches are widely used in various electronic devices that require moisture and water resistance, such as home appliance control panels, automotive electronic components, outdoor lighting equipment, and industrial instrumentation. The core process involves creating a sealed structure through potting colloid to isolate it from external environmental corrosion. A split-type design is typically used. The operator first secures the terminal block to the open base of the switch body. The waterproof housing and switch body are then mechanically joined to form a sealed cavity. Liquid epoxy resin or silicone material is then injected through dedicated potting holes. Once the colloid solidifies, it forms a waterproof layer around the terminal block. This process achieves both electrical insulation and physical protection, but requires high assembly precision and potting quality control during implementation.

[0003] Chinese patent document CN212810138U discloses a miniature waterproof micro switch, including a switch body and a waterproof shell, wherein the switch body is provided with an opening, and the switch body is provided with a base for fixing the wiring terminal at the opening, and the base is sealed and connected to the inner wall of the switch body, one end of the waterproof shell is spliced with the opening, and a cover plate is integrally formed in the waterproof shell near the splicing. 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, and the cover plate is provided with a glue filling hole, and the cover plate is provided with a through hole for the wiring terminal to pass through. The base is protruding toward one end of the waterproof shell and is provided with a reinforcement layer for improving the adhesion of the glue during glue filling, and the two sides of the reinforcement layer extend toward the waterproof shell to form reinforcement ribs.

[0004] Although the above scheme optimizes the adhesion of the glue by providing a vertically raised reinforcement layer with reinforcement ribs, its structure still has significant defects: first, the waterproof shell and the switch body are connected in a splicing manner, and the interface between the two is only sealed twice by glue. Under the action of long-term mechanical vibration or temperature difference deformation, interface peeling is prone to occur, resulting in the risk of sealing failure; second, the reinforcement layer adopts a vertical protrusion design. When the colloid layer produces initial cracks due to stress concentration, the cracks will be subjected to shear stress when they extend to the root of the reinforcement layer. Since the vertical protrusion structure lacks anti-shear support, it accelerates the extension of the cracks along the edge of the reinforcement rib, causing the waterproof glue layer to form a through crack. Water vapor can quickly penetrate into the switch along the crack and cause a short circuit failure. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a glue-potting waterproof switch which enhances the sealing effect of the pins of the micro switch.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a glue-potting waterproof switch, comprising a switch body and a waterproof shell, wherein the switch body is provided with a base for fixing pins at an opening, the base is sealed with the inner wall of the switch body, and a reinforcement layer is provided on the base for improving the adhesion of the glue during glue potting. The waterproof shell is formed by pouring and curing the potting glue on the base, and a reinforcement groove is provided between the reinforcement layer and the base for the potting glue to flow into when the waterproof shell is formed, and the extension direction of the reinforcement groove is consistent with the pin arrangement direction.

[0007] The beneficial effects of the present invention are as follows: by directly forming a waterproof shell on the base through the glue pouring process, a seamless interface can be achieved, eliminating the hidden danger of water seepage in the gaps of the traditional assembled sealing structure. The parallel reinforcement grooves increase the contact area of the potting glue while reducing the shear stress concentration problem caused by thermal expansion and contraction during the curing process through directional optimization. For example, when the potting glue shrinks during the curing stage, the reinforcement grooves parallel to the base can release the stress evenly along the length direction, avoiding the expansion of microcracks caused by stress concentration perpendicular to the base direction. As a preferred embodiment, the reinforcement grooves can be designed as a continuous wavy structure, forming multiple stress buffer sections in the direction parallel to the base, which not only maintains the continuity of the flow path of the potting glue, but also disperses the shear stress through the alternating distribution of peaks and troughs, further reducing the probability of cracks.

[0008] Furthermore, the reinforcement layer includes a support seat protruding from the center of the base and reinforcement plates arranged on the support seat and extending on both sides perpendicular to the direction of pin distribution. The reinforcement groove is located between the reinforcement plate and the base. The reinforcement plate is covered on the potting glue after it is cured to prevent the waterproof shell from falling off the base.

[0009] This structure forms a three-dimensional support frame with a support base. The suspended area formed by the reinforcement plate and the base provides a three-dimensional flow space for the potting compound. The end of the reinforcement plate forms a mechanical lock structure for the cured potting compound. When the waterproof shell is pulled by external forces, the hook-shaped interface formed by the edge of the reinforcement plate and the potting compound resists vertical peeling forces. As a preferred method, the end of the reinforcement plate can be designed as a barbed structure with triangular ribs positioned inside the barb. During the potting process, the glue penetrates the cavity formed by the barb and the rib. After curing, a multi-point anchoring structure is formed, improving the resistance to pull-off.

[0010] Furthermore, the reinforcement plate and the support seat are arranged flush at the end surfaces perpendicular to the pin distribution direction.

[0011] This alignment creates a continuous, smooth boundary between the reinforcement layers, ensuring a uniform wetting interface for the potting compound as it flows. Flush end faces prevent eddies or bubble accumulation during the flow of the adhesive, and the smooth boundary conditions facilitate stable filling along the desired direction. As a preferred approach, inclined guide surfaces of a certain width are provided on both sides of the support base, forming a continuous transition surface with the reinforcement plate. This guides the adhesive to smoothly divert flow upon encountering the pin array, minimizing filling defects caused by localized turbulence.

[0012] Furthermore, a diversion block protruding from the support seat is provided at the center of each reinforcement groove, and the diversion block is used to guide the potting glue into the reinforcement grooves located on both sides thereof.

[0013] The diverter block changes the glue distribution pattern of traditional linear flow channels, actively directing the glue toward the two side reinforcement grooves through a raised structure. When glue filling pressure acts on the front of the diverter block, the glue is forced into two streams, entering the left and right reinforcement grooves, respectively, to ensure symmetrical filling. As a preferred method, the diverter block can adopt an arrow-shaped structure, with its tip pointing toward the glue filling inlet. The two side wings and the side walls of the reinforcement groove form a tapered flow channel, which not only ensures the diversion effect but also reduces flow resistance and prevents the glue from forming a stagnation zone behind the diverter block.

[0014] Furthermore, the distance that the diverter block protrudes from the support seat is less than the depth of the reinforcement groove.

[0015] This dimensional relationship ensures a reasonable distance between the top of the diverter block and the top of the reinforcement groove, ensuring effective diversion while avoiding the formation of flow dead zones. When the diverter block protrudes by 2 / 3 of the groove depth, the adhesive can form a secondary diversion channel between the top of the diverter block and the groove top, enhancing the adhesive's ability to penetrate the longitudinal direction of the reinforcement groove. For example, a 2mm high diverter block is installed in a 3mm deep reinforcement groove, with a 1mm gap between the top and the groove top. This gap can guide some of the adhesive upward to infiltrate 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 reinforcement plate along the pin distribution direction, and the cover plate includes a reinforcement portion protruding from the reinforcement plate along the pin distribution direction and a connecting portion extending perpendicular to the end face direction of the reinforcement plate, and a second reinforcement groove is formed between the reinforcement portion and the base.

[0017] The L-shaped structure of the cover plate creates a three-dimensional shield at the end of the reinforcement plate. The reinforcement extends over the edge of the potting compound, while the connecting portion provides lateral support. The second reinforcement groove forms an orthogonal network with the original reinforcement grooves to contain the adhesive. If microcracks develop in the second reinforcement grooves, the perpendicularly intersecting reinforcement grooves block the crack propagation path. As a preferred method, a curved flange can be provided at the end of the reinforcement portion, forming a crescent-shaped second reinforcement groove with the base. This curved structure evenly distributes stress from different directions while increasing the contact circumference between the adhesive and the metal component.

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

[0019] This composite sloped design creates a dynamic flow field control structure. The straight section ensures a stable initial flow direction for the adhesive, the inclined diversion section guides the adhesive outward, and the high-angle return section creates a reverse pressure gradient to prevent backflow. The combination of these two creates localized vortices in the later stages of adhesive pouring, promoting adhesive penetration and filling in complex corners.

[0020] Furthermore, arc-shaped guide surfaces and oblique-angle guide surfaces are provided on the end surfaces on both sides along the direction of the second reinforcement groove between the reinforcement portion and the connection portion.

[0021] The curved guide surface smoothly redirects the flow of the adhesive, while the angled guide surface provides directional guidance. As the adhesive flows through this combined guide structure, the curved surface reduces energy loss, while the angled surface precisely directs the adhesive to the distal end of the second reinforcement groove.

[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 seat is provided at the center of each second reinforcement groove. The second diversion block is used to drain the potting glue to the second reinforcement groove and the reinforcement groove located on both sides thereof.

[0023] The orthogonally distributed secondary flow blocks form a three-dimensional flow network with the primary flow block, ensuring uniform distribution of the glue in both the vertical and horizontal directions. The secondary flow blocks can adopt a pyramidal structure, with multiple inclined surfaces corresponding to multiple flow directions, achieving radial filling of the glue under the action of the glue filling pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an axonometric diagram of an embodiment of the present invention; Figure 2 This is a disassembly diagram of an embodiment of the present invention; Figure 3 This is an axonometric view of a base according to an embodiment of the present invention; Figure 4 It is a front view of the base according to an embodiment of the present invention; Figure 5 A side view of a base according to an embodiment of the present invention; Figure 6 This is a partial enlarged view of the cover plate of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The embodiment of the present invention is a glue-filled waterproof switch. Figure 1-6 The switch body 1 includes a waterproof housing 2 formed by potting. The switch body 1 has a base 3 at its opening, which forms a sealed connection with the inner wall of the switch body. A reinforcement layer 4 is provided on the surface of the base 3 to enhance the adhesion of the adhesive. A reinforcement groove 5, parallel to the base, is formed between the base 3 and the reinforcement layer 4. This groove 5 provides a flow path for the potting adhesive during the potting process.

[0026] The reinforcement layer 4 consists of a support base 41 located at the center of the base 3 and two reinforcement plates 42 extending from either side. The two reinforcement plates 42 extend perpendicularly to the direction of the pins 6. The reinforcement groove 5 formed between the reinforcement plates 42 and the base 3 is covered by the plates 42 after the potting compound cures, forming a snap-fit structure that prevents the waterproof housing 2 from falling out. The support base 41 and reinforcement plates 42 form flush end surfaces 411 at their ends perpendicular to the pins 6, ensuring uniform colloidal flow.

[0027] A raised diverter block 51 is located at the center of the reinforcement groove 5, extending in the same direction as the pins 6. This diverter block 51 is shorter than the depth of the reinforcement groove 5 and diverts the potting compound to the two sides of the reinforcement groove 5. L-shaped cover plates 7 are located on both ends of the reinforcement plate 42. Each cover plate 7 comprises a reinforcement portion 71 protruding in the direction of the pins and a vertically extending connecting portion 72. A second reinforcement groove 8 is formed between the reinforcement portion 71 and the base 3. The end face of the reinforcement portion 71 consists of a straight section 711 and an inclined diverter section 712. A return section 721 with a greater inclination angle is located corresponding to the connecting portion 72, forming a diversion structure.

[0028] The cover plate 7 is provided with curved guide surfaces 73 and angled guide surfaces 74 on both sides of the end surface. A second diverter block 81 is provided in the center of the second reinforcement groove 8 to divert the colloid to the second reinforcement groove 8 and the reinforcement groove 5. The cooperation between the guide surfaces and the diverter block ensures that the potting glue evenly fills all the reinforcement grooves.

[0029] Working Principle: After the potting glue is injected, it first contacts the diverter block 51 on the support seat 41 and is evenly diverted to the reinforcement grooves 5 on both sides. During the flow process, the diverter block 81 guides part of the colloid into the second reinforcement groove 8. During the flow, the colloid is blocked by the reinforcement plate 42, forming vortices along the arc-shaped guide surface 73 and the angled guide surface 74, ensuring that the colloid is in full contact with the base 3. The waterproof shell 2 formed after curing is mechanically interlocked with the reinforcement plate 42 through a snap-fit structure. At the same time, the colloid in the reinforcement groove 5 and the second reinforcement groove 8 forms a multi-directional anchoring structure, which together prevents the waterproof shell 2 from falling off.

[0030] As a preferred method, the wires are connected to the pins 6 before the glue is poured. After the glue is solidified, the wires will naturally remain outside the waterproof shell 2 without leaving any gaps for water vapor to enter.

[0031] It should be noted that the shape of the waterproof shell 2 depends on the shape of the mold when the potting glue is injected. When the potting glue is injected, the end surface of the base 3 facing the reinforcement layer 4 is filled with potting glue, and then solidified to form the waterproof shell 2.

[0032] The above embodiment is only one preferred embodiment of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A glue-potting waterproof switch, comprising a switch body and a waterproof housing, wherein the switch body is provided with a base at an opening for fixing pins, the base being sealed to the inner wall of the switch body, and a reinforcement layer for improving the adhesion of the glue during the glue potting process, characterized in that: The waterproof shell is formed by pouring potting glue on the base and then curing it. A reinforcement groove is provided between the reinforcement layer and the base for the potting glue to flow into when the waterproof shell is formed. The extension direction of the reinforcement groove is consistent with the pin arrangement direction.

2. The glue-filled waterproof switch according to claim 1, characterized in that: The reinforcement layer includes a support seat protruding from the center of the base and a reinforcement plate arranged on the support seat and extending on both sides perpendicular to the direction of pin distribution. The reinforcement groove is located between the reinforcement plate and the base. The reinforcement plate is covered on the potting glue after it is cured to prevent the waterproof shell from falling off the base.

3. The glue-filled waterproof switch according to claim 2, characterized in that: The reinforcing plate and the supporting seat are arranged flush at the end surfaces perpendicular to the pin distribution direction.

4. The glue-filled waterproof switch according to claim 2, characterized in that: A diversion block protruding from the support seat is provided at the center of each reinforcement groove, and the diversion block is used to guide the potting glue into the reinforcement grooves located on both sides thereof.

5. The glue-filled waterproof switch according to claim 4, characterized in that: The distance that the diverter block protrudes from the support seat is less than the depth of the reinforcement groove.

6. The glue-filled waterproof switch according to claim 2, characterized in that: The reinforcement plate is provided with a cover plate on both end faces along the pin distribution direction. The cover plate includes a reinforcement portion protruding from the reinforcement plate along the pin distribution direction and a connecting portion extending perpendicular to the end face direction of the reinforcement plate. A second reinforcement groove is formed between the reinforcement portion and the base.

7. The glue-filled waterproof switch according to claim 6, characterized in that: The end surface of the reinforcement portion that is perpendicular to the pin distribution direction is divided into a straight section close to the second reinforcement groove and a diversion section away from the second reinforcement groove, and the diversion section is arranged at an angle; the end surface corresponding to the straight section and the diversion section on the connecting portion and the reinforcement portion is provided with a return section with an inclination angle greater than that of the diversion section.

8. The glue-filled waterproof switch according to claim 7, characterized in that: An arc-shaped flow-guiding surface and an oblique-angle flow-guiding surface are provided on the end surfaces on both sides along the direction of the second reinforcement groove between the reinforcement portion and the connection portion.

9. The glue-filled 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 seat is provided at the center of each second reinforcement groove. The second diversion block is used to drain the potting glue to the second reinforcement groove and the reinforcement groove located on both sides of it.

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