A deflation balancing membrane structure with high-pressure water flow impact resistance

Abstract

The utility model relates to electronic product technical field, concretely relates to a kind of deflation balance membrane structure with high-pressure water flow impact resistance, including the following structure of sequentially laminated arrangement: first adhesive layer;Microporous breathable balance membrane;Second adhesive layer;Rigid support layer;Wherein, the rigid support layer is provided with at least one air hole, the projection position of the air hole avoids the deflation hole passage area corresponding to the microporous breathable balance membrane.The utility model increases the protection of PET layer, so that deflation balance membrane is not easy to deform and break when impacted by water pressure;Deflation balance membrane PET opening position is designed ingeniously to avoid deflation hole passage, reduce the deformation caused by water pressure impact of balance membrane;It can effectively pass through IPX9K test requirement, and the whole machine function is complete.

Description

Technical Field

[0001] This utility model relates to the field of electronic product technology, specifically to a venting balance membrane structure with the ability to resist the impact of high-pressure water flow. Background Technology

[0002] Existing pressure relief diaphragms typically employ a two-layer design consisting of an adhesive backing and a diaphragm layer. Under normal conditions, this combination maintains a certain level of sealing and functionality. However, in specific IPX9K waterproof testing scenarios, when equipment is exposed to high-temperature, high-pressure water flow, the water directly impacts the diaphragm surface, causing thermal expansion and mechanical stress on the material. This external force leads to irreversible deformation of the diaphragm, resulting in a significant increase in the internal pore size and destruction of the original microporous structure, thus completely eliminating its waterproof function. This waterproof failure not only directly affects the performance of local components but also further impacts the overall waterproof test results, leading to test failure or certification rejection. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model discloses a venting balance membrane structure with resistance to high-pressure water flow impact, which is used to solve the above-mentioned problems.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model provides a venting balance membrane structure with resistance to high-pressure water flow impact, comprising the following structures stacked in sequence:

[0006] First adhesive layer;

[0007] Microporous breathable balancing membrane;

[0008] Second adhesive layer;

[0009] Rigid support layer;

[0010] The rigid support layer has at least one vent hole, and the projected position of the vent hole avoids the venting channel area corresponding to the microporous venting balance membrane.

[0011] Furthermore, the rigid support layer is any one of polyethylene terephthalate film, polyimide film, or metal foil, with a thickness of 0.05–0.5 mm.

[0012] Furthermore, the vents are circular, polygonal, or in a grid-like array, and their total area accounts for 5%–40% of the surface area of ​​the rigid support layer.

[0013] Furthermore, the minimum horizontal distance between the edge of the vent hole and the edge of the vent channel is greater than 0.5 mm.

[0014] Furthermore, the microporous breathable balancing membrane is any one of expanded polytetrafluoroethylene membrane, polyolefin microporous membrane, or hydrophilic waterproof breathable membrane, with an average pore size of 0.1–10 μm.

[0015] Furthermore, the first adhesive layer and the second adhesive layer are any one of acrylic pressure-sensitive adhesive, silicone pressure-sensitive adhesive or hot melt adhesive, with a thickness of 0.01–0.1 mm.

[0016] Furthermore, the venting balance membrane structure is integrally embedded in the sealing groove of the equipment housing, and the rigid support layer is located on the outermost side.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention adds protection to the PET layer, making the venting balance membrane less prone to deformation and damage when subjected to water pressure impact; the PET opening position of the venting balance membrane is cleverly designed to avoid the venting channel, reducing deformation caused by water pressure impact; it can effectively pass the IPX9K test requirements, and the whole machine is fully functional. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a venting balance membrane structure with the ability to resist the impact of high-pressure water flow;

[0021] Figure 2 This is a horizontal cross-sectional view of a venting balance membrane structure with the ability to resist the impact of high-pressure water flow;

[0022] Figure 3 This is a vertical cross-sectional view of a venting balance membrane structure with the ability to resist the impact of high-pressure water flow;

[0023] The labels in the diagram represent:

[0024] 1. Vent hole channel area; 2. Vent hole of shielding cover. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] In one embodiment, the venting balance membrane structure is implemented through the following steps: First, the first adhesive layer is uniformly coated on the bottom of the sealing groove of the equipment housing; then, the microporous venting balance membrane is precisely aligned and placed on the first adhesive layer, ensuring that its venting channel area is not obstructed by any covering; next, a second adhesive layer is applied to the surface of the microporous venting balance membrane and covers the rigid support layer, ensuring that the venting holes of the rigid support layer strictly avoid the projected position of the venting channel area, with a minimum horizontal distance greater than 0.5 mm; finally, the layers are tightly bonded together through hot pressing or roll pressing processes to form an integral structure. In the IPX9K waterproof test, this structure can withstand a high temperature of 80℃ and a water pressure impact of 80-100 bar, with the pore size change rate of the microporous venting balance membrane being less than 5%, effectively preventing deformation and damage.

[0027] In one embodiment, reference is made to Figure 1 , Figure 2 and Figure 3 As shown, the vent channel area 1 corresponds to the central area of ​​the microporous breathable balancing membrane, with a diameter of 2-5 mm. The vent holes 2 of the shielding cover are distributed in a circular array at the edge of the rigid support layer, with a pore size of 0.5-2 mm, and the total area accounts for 15-30% of the surface area of ​​the rigid support layer. In practical applications, when polyethylene terephthalate film is selected as the rigid support layer, the thickness is preferably 0.1 mm. Expanded polytetrafluoroethylene film is used as the microporous breathable balancing membrane with an average pore size of 0.5 μm. Acrylic pressure-sensitive adhesive is used as the adhesive layer with a thickness of 0.05 mm. This ensures that after the entire structure is embedded in the sealing groove, the rigid support layer is exposed to the external environment and directly resists the impact of water flow.

[0028] Furthermore, during assembly, the ambient humidity must be strictly controlled below 40%, and the temperature must be maintained within the range of 20-25℃ to prevent adhesive layer failure. Test results show that after 100 consecutive high-pressure water jet impacts, the waterproof performance retention rate of this structure exceeds 99%, meeting the casing sealing requirements of electronic products such as smartphones and smartwatches, and significantly improving the overall waterproof certification pass rate.

[0029] In another embodiment, the rigid support layer uses 0.2mm thick aluminum foil as the metal foil sheet, and its surface is laser-etched to form a grid-like array of breathable holes. The grid unit size is 0.8mm × 0.8mm, and the total area of ​​the openings accounts for 35%. The microporous breathable balancing membrane uses a polyolefin microporous membrane with an average pore size of 10μm, which is bonded to the aluminum foil through a 0.08mm thick silicone pressure-sensitive adhesive layer. During installation, the combined structure is pressed into the annular sealing groove of the smartwatch back cover, with the aluminum foil grid facing outward. In the IPX9K test, when the rotating nozzle at 80℃ and 100bar sprays at four angles for 30 seconds each, the aluminum foil grid effectively disperses the impact force of the water flow. The measured deformation amplitude of the polyolefin membrane in the central area is less than 5μm, and the air permeability reduction rate after spraying is only 2.7%. Disassembly verification showed no peeling between the aluminum foil and the adhesive layer, and no water seepage traces in the sealing groove, meeting the waterproof and breathable requirements of smart wearable devices in extreme environments.

[0030] In summary, this utility model adds protection to the PET layer, making the venting balance membrane less prone to deformation and damage when subjected to water pressure impact; the PET opening position of the venting balance membrane is cleverly designed to avoid the venting channel, reducing deformation caused by water pressure impact; it can effectively pass the IPX9K test requirements, and the whole machine is fully functional.

[0031] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A venting balance membrane structure with resistance to high-pressure water flow impact, characterized in that, This includes the following structures arranged in a stacked manner: First adhesive layer; Microporous breathable balancing membrane; Second adhesive layer; Rigid support layer; The rigid support layer has at least one vent hole, and the projected position of the vent hole avoids the venting channel area corresponding to the microporous venting balance membrane.

2. The venting balance membrane structure with resistance to high-pressure water flow impact as described in claim 1, characterized in that, The rigid support layer is any one of polyethylene terephthalate film, polyimide film, or metal foil, with a thickness of 0.05–0.5 mm.

3. The venting balance membrane structure with resistance to high-pressure water flow impact as described in claim 1, characterized in that, The vent holes are circular, polygonal, or in a grid pattern, and their total area accounts for 5%–40% of the surface area of ​​the rigid support layer.

4. The venting balance membrane structure with resistance to high-pressure water flow impact as described in claim 3, characterized in that, The minimum horizontal distance between the edge of the vent hole and the edge of the vent channel is greater than 0.5 mm.

5. The venting balance membrane structure with resistance to high-pressure water flow impact as described in claim 1, characterized in that, The microporous breathable balancing membrane is any one of expanded polytetrafluoroethylene membrane, polyolefin microporous membrane, or hydrophilic waterproof and breathable membrane, with an average pore size of 0.1–10 μm.

6. The venting balance membrane structure with resistance to high-pressure water flow impact as described in claim 1, characterized in that, The first adhesive layer and the second adhesive layer are any one of acrylic pressure-sensitive adhesive, silicone pressure-sensitive adhesive or hot melt adhesive, and the thickness is 0.01–0.1 mm.

7. The venting balance membrane structure with resistance to high-pressure water flow impact as described in claim 1, characterized in that, The venting balance membrane structure is embedded in the sealing groove of the equipment housing, and the rigid support layer is located on the outermost side.

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