Sealing structure for filter screen as well as ventilation valve and waterproof ventilation explosion venting valve formed by sealing structure

Abstract

The utility model discloses a sealing structure for a filter screen, which comprises a shell, the filter screen and a sealing curing layer, the filter screen is positioned in the shell, and one side of the filter screen is connected into the shell through the sealing curing layer; a sealing material is pressed into the filter screen in an injection molding or compression molding mode, a sealing curing layer connecting the filter screen and the shell is formed, and the sealing curing layer incompletely covers the filter screen. According to the sealing structure for the filter screen, the sealing material is pressed into the filter screen in an injection molding or compression molding mode, the sealing curing layer connecting the filter screen and the shell is formed, the sealing curing layer incompletely covers the filter screen, and sealing connection between the filter screen and the shell is achieved through the sealing curing layer; the defects that in the prior art, the filter screen and the shell are not firmly combined, and leakage occurs are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of filter screen connection, in particular to a sealing structure for a filter screen and a breathable valve and a waterproof breathable explosion relief valve formed therefrom. Background Art

[0002] In waterproof breathable valves, waterproof breathable explosion relief valves and other breathable valves, it is necessary to encapsulate the metal or plastic shell and the filter material. Currently, there are three types of packaging for filter materials: direct interference fit; self-adhesive adhesive bonding; glue bonding.

[0003] Direct interference fit may cause leakage and damage to the filter material during the processing. It may also be damaged due to repeated folding between the filter material and the shell during use, so it is rarely used.

[0004] The adhesive backing method of self-adhesive stickers has the problem of limited life span of self-adhesive stickers, which generally does not exceed 5 years, and it is difficult for self-adhesive stickers to be hydrophobic. The adhesive failure problem of self-adhesive stickers when they come into contact with water or oil is inevitable, and it is difficult to completely penetrate into the gaps of non-woven fabrics to fill them and cause water seepage.

[0005] Glue pasting solution: During the process of glue application, it is difficult for glue to completely penetrate into the filter material, which will cause leakage. Especially for products without sufficient pasting area. For small products, glue application is also very difficult. Utility Model Content

[0006] In view of this, the present application aims to solve the problems in the related art to at least a certain extent. One of the purposes of the present application is to provide a sealing structure for a filter screen, in which a sealing material is pressed into the filter screen by injection molding or compression molding to form a sealing solidified layer connecting the filter screen and the shell, and the sealing solidified layer does not completely cover the filter screen. The sealing connection between the filter screen and the shell is achieved through the sealing solidified layer, thereby avoiding the defects of the prior art that the filter screen and the shell are not firmly connected and leakage occurs.

[0007] In order to achieve the above purpose, this application adopts the following technical solutions:

[0008] A sealing structure for a filter screen comprises a shell, a filter screen and a sealing solidified layer, wherein the filter screen is located inside the shell, and one side of the filter screen is connected to the shell through the sealing solidified layer; a sealing material is pressed into the filter screen by injection molding or compression molding to form a sealing solidified layer connecting the filter screen and the shell, and the sealing solidified layer does not completely cover the filter screen.

[0009] Furthermore, the filter screen is made of any one of non-woven fabrics, waterproof breathable membranes, stretch membranes, cloths, and isolation membranes.

[0010] Furthermore, the sealing solidification layer is made of rubber material.

[0011] Furthermore, the rubber material is a sealing material such as silicone, hydrogenated nitrile rubber or thermoplastic vulcanized rubber.

[0012] Furthermore, the sealing solidified layer is located at the edge of the filter screen, and the distance between the sealing solidified layer and the filter screen center is greater than or equal to 2 mm.

[0013] Furthermore, the thickness of the sealing solidified layer infiltrated into the filter screen is greater than or equal to 0.5 mm.

[0014] Furthermore, the sealing solidified layer is in a ring shape located at the edge of the filter screen, and the width of the sealing solidified layer in the radius dimension of the circular filter screen is greater than or equal to 2 mm.

[0015] A breathable valve comprises the sealing structure for a filter as described above.

[0016] A waterproof and breathable explosion relief valve comprises a sealing structure for a filter as described above.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the sealing structure for the filter screen of the present application includes a shell, a filter screen and a sealing solidified layer, wherein the filter screen is located inside the shell, and one side of the filter screen is connected to the shell through the sealing solidified layer; the sealing material is pressed into the filter screen by injection molding or compression molding to form a sealing solidified layer connecting the filter screen and the shell, and the sealing solidified layer does not completely cover the filter screen. The present application adopts injection molding or compression molding to form a sealing solidified layer, that is, the sealing solidified layer is formed after the sealing layer material is injected or molded, and during the injection molding or molding process, the sealing solidified layer penetrates into the inside of the filter screen, so that the filter screen and the shell are firmly bonded; the structure of the present application can avoid the phenomenon of instability when the filter screen and the shell are pasted in the prior art; ensure that the sealing solidified layer firmly connects the filter screen and the shell to avoid defects such as water seepage and leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] In the attached figure:

[0021] Figure 1 is a structural schematic diagram of a sealing structure;

[0022] Figure 2 The figure is a connection diagram of the experimental device.

[0023] Reference numerals:

[0024] 11. filter screen; 12. sealing curing layer; 13. shell; 21. fixture. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the mechanism or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present application.

[0026] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0027] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, mechanisms, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0028] Example 1

[0029] like Figure 1 As shown, the present application provides a sealing structure for a filter, comprising a shell 13, a filter 11 and a sealing solidified layer 12, wherein the filter 11 is located inside the shell 13, and one side of the filter 11 is connected to the shell 13 through the sealing solidified layer 12; the sealing material is pressed into the filter 11 by injection molding or compression molding to form a sealing solidified layer 12 connecting the filter 11 and the shell 13, and the sealing solidified layer 12 does not completely cover the filter 11.

[0030] The present application adopts injection molding or compression molding to form the sealing solidified layer 12, that is, the sealing solidified layer 12 is formed after the sealing layer material is injection molded or molded. The injection molding or molding process needs to experience a certain degree of high temperature and high pressure. Under a certain temperature and pressure, the sealing layer melts and completely penetrates into the filter screen 11. After high temperature and high pressure, curing is performed, so that the sealing solidified layer 12 has a good encapsulation sealing effect.

[0031] Injection molding refers to a method in which completely molten plastic material is stirred by a screw at a certain temperature, injected into a mold cavity with high pressure, and then cooled and solidified to obtain a molded product.

[0032] Compression molding (also known as press molding or compression molding) is an operation in which powdered, granular or fibrous plastic is placed into a mold cavity at molding temperature, and then the mold is closed and pressurized to form and solidify it.

[0033] During the injection molding or molding process, the sealing solidifying layer 12 penetrates into the interior of the filter 11, so that the filter 11 and the shell 13 are firmly bonded; the structure of the present application can avoid the loose phenomenon that occurs when the filter 11 and the shell 13 are pasted together in the prior art; ensure that the sealing solidifying layer 12 firmly connects the filter 11 and the shell 13 to avoid defects such as water seepage and leakage.

[0034] Example 2

[0035] like Figure 1 As shown, the present application provides a sealing structure for a filter, comprising a shell 13, a filter 11 and a sealing solidified layer 12, wherein the filter 11 is located inside the shell 13, and one side of the filter 11 is connected to the shell 13 through the sealing solidified layer 12; the sealing material is pressed into the filter 11 by injection molding or compression molding to form a sealing solidified layer 12 connecting the filter 11 and the shell 13, and the sealing solidified layer 12 does not completely cover the filter 11.

[0036] The material of the filter screen 11 of the present application is any one of non-woven fabric, waterproof breathable film, stretch film, cloth, and isolation film. In the field of breathable valves such as waterproof breathable valves and waterproof breathable explosion relief valves, the filter screen 11 can also be a metal filter screen 11. The sealing structure of the present application can also be used in any technical field that requires filtration, such as solid-liquid separation, gas-liquid separation, and other technical fields.

[0037] The sealing solidified layer 12 of the present application refers to the adhesion layer formed after injection molding or compression molding and has penetrated into the filter 11 for connecting the filter 11 and the housing 13. The present application defines the raw material before injection molding or compression molding as the sealing layer. The sealing solidified layer 12 refers to the sealing layer after injection molding or compression molding. During the injection molding or compression molding process, the sealing layer is melted by high temperature and high pressure, and penetrates into the filter 11, and then solidified to form the sealing solidified layer 12. In the present application, the filter 11, the sealing solidified layer 12 and the housing 13 are injection molded or compression molded together, and the sealing solidified layer 12 after molding adheres the filter 11 and the housing 13 together.

[0038] In the present application, the material of the sealing solidified layer 12 is a rubber material, which first melts and penetrates into the filter screen 11 during injection molding or compression molding, and then solidifies to form the sealing solidified layer 12. Specifically, the material of the sealing solidified layer 12 is silicone or hydrogenated nitrile rubber or thermoplastic vulcanized rubber.

[0039] It should be noted that after injection molding or compression molding, the filter 11 still needs to maintain its filtering function. Therefore, the sealing solidification layer 12 is arranged on the edge of the filter 11, so as to ensure that the edge of the filter 11 is fixed in the shell 13, and the middle of the filter 11 still maintains air permeability, thereby achieving the purposes of solid-liquid separation, gas-liquid separation, etc. of the device in which it is located.

[0040] In order to ensure that the sealing solidified layer 12 has a good adhesion effect, the present application sets the distance of the sealing solidified layer 12 from the edge of the filter 11 to the center of the filter 11 to be greater than or equal to 2 mm. The present application defines "the distance of the sealing solidified layer 12 from the edge of the filter 11 to the center of the filter 11" as the width of the sealing solidified layer 12. In actual operation, the width of the sealing solidified layer 12 needs to be greater than or equal to 2 mm to ensure that the sealing solidified layer 12 formed after injection molding or compression molding can firmly adhere the filter 11 to the housing 13.

[0041] In actual operation, the width of the sealing solidified layer 12 can be modified according to the size of the filter screen 11 . The larger the size of the filter screen 11 , the wider the width of the sealing solidified layer 12 needs to be.

[0042] In order to ensure that the sealing solidified layer 12 has a good adhesion effect, the present application sets the thickness of the sealing solidified layer 12 penetrating into the filter screen 11 to be greater than or equal to 0.5 mm. The thickness of the sealing solidified layer 12 penetrating into the filter screen 11 refers to the depth of the sealing layer penetrating into the filter screen 11 after melting during the injection molding or compression molding process. Only when this depth meets certain conditions can it be ensured that the sealing solidified layer 12 formed after injection molding or compression molding can firmly adhere the filter screen 11 to the housing 13.

[0043] In actual operation, the width of the sealing solidified layer 12 can be modified according to the size of the filter screen 11 . The thicker the filter screen 11 is, the thicker the sealing solidified layer 12 needs to be.

[0044] It should be noted that, in the process of injection molding or compression molding, the sealing solidified layer is preferably completely pressed into the interior of the filter screen so that the surface of the filter screen is flush with the surface of the sealing solidified layer, so as to ensure that the edge of the filter screen abuts against the shell structure at the notch in the shell, such as Figure 1 In the process of injection molding or compression molding, the sealing solidified layer can be partially pressed into the filter screen, so that the filter screen does not contact the housing, but one side of the sealing solidified layer abuts against the housing, and the other side of the sealing solidified layer abuts against the filter screen.

[0045] The present application also discloses a breathable valve, including a sealing structure for a filter as described above. The breathable valve in the present application can be a waterproof breathable valve, a waterproof breathable explosion relief valve, etc. Specifically, the breathable valve includes a housing, the housing is provided with a through hole, the filter 11 is located inside the housing, and the other side of the filter 11 is connected to the housing on the side of the through hole through a sealing solidified layer 12, ensuring that a fluid channel is formed on both sides of the filter.

[0046] In the breathable valve used for gas-liquid separation, the filter pore size on the surface of the filter screen 11 is very small, and the filter screen 11 relies on its own surface tension to prevent water molecules from passing through within a certain range. Therefore, the waterproof breathable valve can effectively prevent water from entering the interior of the device, while ensuring that the gas inside the device passes through the filter screen 11, thereby ensuring the air permeability of the device.

[0047] During the injection molding or molding process, the sealing solidifying layer 12 penetrates into the interior of the filter 11, so that the filter 11 and the shell 13 are firmly bonded; the structure of the present application can avoid the loose phenomenon that occurs when the filter 11 and the shell 13 are pasted together in the prior art; ensure that the sealing solidifying layer 12 firmly connects the filter 11 and the shell 13 to avoid defects such as water seepage and leakage.

[0048] The present application also discloses a waterproof and breathable explosion relief valve, comprising a sealing structure for a filter screen as described above, and the installation position and working principle are similar to those of the breathable valve.

[0049] The present application also discloses an explosion-proof valve, comprising a sealing structure for a filter screen as described above, and the installation position and working principle are similar to those of a breathable valve.

[0050] Example 3

[0051] like Figure 1 As shown, the present application provides a sealing structure for a filter, comprising a shell 13, a filter 11 and a sealing solidified layer 12, wherein the filter 11 is located inside the shell 13, and one side of the filter 11 is connected to the shell 13 through the sealing solidified layer 12; the sealing material is pressed into the filter 11 by injection molding or compression molding to form a sealing solidified layer 12 connecting the filter 11 and the shell 13, and the sealing solidified layer 12 does not completely cover the filter 11.

[0052] The sealing solidified layer 12 of the present application refers to the adhesion layer formed after injection molding or compression molding and has penetrated into the filter 11 for connecting the filter 11 and the housing 13. The present application defines the raw material before injection molding or compression molding as the sealing layer. The sealing solidified layer 12 refers to the sealing layer after injection molding or compression molding. During the injection molding or compression molding process, the sealing layer is melted by high temperature and high pressure, and penetrates into the filter 11, and then solidified to form the sealing solidified layer 12. In the present application, the filter 11, the sealing solidified layer 12 and the housing 13 are injection molded or compression molded together, and the sealing solidified layer 12 after molding adheres the filter 11 and the housing 13 together.

[0053] The filter screen 11 of the present application is made of an isolation membrane.

[0054] In the present application, the material of the sealing solidified layer 12 is sealing materials such as silicone, hydrogenated nitrile rubber, and thermoplastic rubber.

[0055] The filter screen 11 is circular, the sealing solidified layer 12 is annular and located at the edge of the filter screen 11, and the width of the sealing solidified layer 12 on the radius of the circular filter screen 11 is equal to 3 mm. The thickness of the sealing solidified layer 12 infiltrated into the filter screen 11 is equal to 1.0 mm.

[0056] like Figure 2 As shown, an experimental device for testing the above-mentioned breathable membrane is shown, wherein the experimental device includes a fixture 21, and the fixture 21 includes two pieces of organic glass arranged in parallel. After 20 pieces of the above-mentioned sealing structure are stacked, they are placed between the two organic glasses, and the sealing structure and the organic glass are pasted together through a sealing pad, and the two organic glasses are fastened by tightening bolts and screws. A notch is provided in the two organic glasses to match the center of the filter screen 11, and the center of the filter screen 11 here does not include the filter screen 11 area covered by the sealing curing layer 12.

[0057] A water pressure gauge and a water valve are provided in the water inlet pipe. The water valve is opened to ensure that the output water pressure of the water inlet pipe to the sealing structure is 20 kpa. The water pressure of 20 kpa is maintained to impact the sealing structure. After 24 hours, the sealing structure on the other side of the fixture 21 is observed to have no water seepage.

[0058] According to the IP68 definition, if there is no water leakage for 30 minutes under 15Kpa, it is judged to have reached the IP68 waterproof level. This application can maintain no water leakage for more than 24 hours under 20Kpa, which fully demonstrates that the sealing effect of the sealing structure in this application is good and meets the IP68 waterproof level requirements.

[0059] During the injection molding or molding process, the sealing solidifying layer 12 penetrates into the interior of the filter 11, so that the filter 11 and the shell 13 are firmly bonded; the structure of the present application can avoid the loose phenomenon that occurs when the filter 11 and the shell 13 are pasted together in the prior art; ensure that the sealing solidifying layer 12 firmly connects the filter 11 and the shell 13 to avoid defects such as water seepage and leakage.

[0060] It can be understood that the above embodiments only express the preferred implementation methods of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present application; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should belong to the scope covered by the claims of the present application.

Claims

1. A sealing structure for a filter screen, characterized in that: It includes a shell, a filter screen and a sealing solidified layer, wherein the filter screen is located inside the shell, and one side of the filter screen is connected to the shell through the sealing solidified layer; the sealing material is pressed into the filter screen by injection molding or compression molding to form a sealing solidified layer connecting the filter screen and the shell, and the sealing solidified layer does not completely cover the filter screen.

2. A sealing structure for a filter screen according to claim 1, characterized in that: The filter screen is made of any one of non-woven fabrics, waterproof breathable membranes, stretch membranes, cloths, and isolation membranes.

3. A sealing structure for a filter screen according to claim 1, characterized in that: The sealing solidification layer is made of rubber material.

4. A sealing structure for a filter screen according to claim 3, characterized in that: The rubber material is silica gel or hydrogenated nitrile rubber or thermoplastic vulcanized rubber.

5. A sealing structure for a filter screen according to claim 1, characterized in that: The sealing solidified layer is located at the edge of the filter screen, and the distance between the sealing solidified layer and the filter screen center is greater than or equal to 2 mm.

6. A sealing structure for a filter screen according to claim 1, characterized in that: The thickness of the sealing solidified layer infiltrated into the filter screen is greater than or equal to 0.5 mm.

7. A sealing structure for a filter screen according to claim 1, characterized in that: The filter screen is circular, the sealing solidified layer is annular and located at the edge of the filter screen, and the width of the sealing solidified layer on the radius of the circular filter screen is greater than or equal to 2 mm.

8. A vent valve, characterized in that: A sealing structure for a filter screen comprising the sealing structure as described in any one of claims 1 to 7.

9. A waterproof and breathable explosion relief valve, characterized in that: A sealing structure for a filter screen comprising the sealing structure as described in any one of claims 1 to 7.

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