Sealing membrane and filter cartridge
Patent Information
- Application Number
- CN202522509239.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-11-26
AI Technical Summary
1.在长期浸泡于高纯度水体的过程中，复位弹簧会发生电化学腐蚀，析出Fe、Cr及Ni等金属离子，这些金属离子对18.2MΩcm级别的超纯水是致命污染，会导致：
本实用新型提供的密封膜片及滤芯，弹性膜片主体为一体成型结构，用于将滤芯主体前端的进水口或出水口封堵，弹性膜片主体的中部开设的自闭贯穿切口能够闭合，并能够被连接插管撑开，以实现：在自然状态下（滤芯未安装使用前），自闭贯穿切口在弹性膜片主体自身弹性收缩力的作用下保持紧密闭合，实现常态密封，有效防止外部污染物进入滤芯内部；在工作状态下（滤芯安装到位并通水时），外部系统（如水路集成板的连接转子，为中空管状结构）的连接插管会顶入弹性膜片主体中心，将自闭贯穿切口撑开，形成流通通道，水流正常通过，流入或流出滤芯主体，完成正常工作流程；在拆卸状态下（滤芯被拆卸时），连接插管退出，外力撤销后，自闭贯穿切口在弹性膜片主体自身弹性收缩力和滤芯内部水压的共同作用下瞬间自动回弹闭合，重新实现闭合密封，防止水流泄漏；以上整个过程无需任何金属弹簧参与即可实现，因此，本实用新型提供的密封膜片及滤芯取消传统的“塞头+复位弹簧”密封结构，能够有效地避免出现金属离子析出和死体积污染。
Smart Images
Figure CN224877514U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water treatment technology, and in particular to a sealing diaphragm and filter element. Background Technology
[0002] Pure water refers to water free of impurities; it is also known as high-purity water and has extremely high chemical purity. Ultrapure water (UP water) refers to water with a resistivity of 18 MΩ. cm (25℃) of water.
[0003] Existing pure water and ultrapure water filter cartridges typically use a mechanical combination sealing structure of "plug + return spring" for the inlet and outlet. The return spring is usually made of metal (such as stainless steel). This sealing structure has two inherent drawbacks: 1. During prolonged immersion in high-purity water, the return spring undergoes electrochemical corrosion, releasing metal ions such as Fe, Cr, and Ni. These metal ions affect the 18.2 MΩ... Ultrapure water at the centimeter level is a deadly contaminant, leading to: a. Water quality deterioration: This directly leads to a sharp decrease in the resistivity of ultrapure water and a possible increase in the total organic carbon index. b. Experimental interference: It causes high background noise in spectral analysis, contaminates samples, and leads to distorted analytical data; it inhibits enzyme activity in life science experiments and affects cell culture. c. System damage: Metal ions can poison the chromatography column, clog the purification column and pipeline of the ultrapure water system, and significantly increase maintenance costs; 2. Specific Hazards of Structural Dead Volume on UP (Ultrapure) Packets (Terminal Polished Mixed Bed Filter Cartridges): To achieve the compression and reset of the return spring, complex cavity structures for guidance and installation must be designed. These cavities form dead volumes that cannot be effectively flushed by water flow during normal filter cartridge operation. The water within these dead volumes stagnates for extended periods, creating a high-risk area for microbial growth and ion dissolution. This problem is particularly severe for UP packs. As the final barrier before water production, the ultra-high purity resin inside the UP pack is extremely sensitive to fluctuations in the influent water quality. Contaminants accumulated in the dead volumes can be suddenly released during system startup or flow rate changes, forming a concentrated contaminant mass that directly impacts and poisons the resin within the UP pack, drastically reducing its purification efficiency and lifespan. To thoroughly flush away the contaminants accumulated in the traditional structural dead volumes to avoid impacting the UP pack, at least 20% more flushing water and time are required. This not only wastes resources but also means that the effluent water quality from the UP pack is unlikely to instantly stabilize at 18.2 MΩ after each filter cartridge replacement or during the initial system restart. The index is cm. Utility Model Content
[0004] The purpose of this invention is to provide a sealing membrane and filter element to solve the problems existing in the prior art, and to effectively avoid the precipitation of metal ions and dead volume contamination.
[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a sealing diaphragm, including an elastic diaphragm body. The elastic diaphragm body is used to fix the water inlet or outlet at the front end of the filter element body and to block the water inlet or outlet at the front end of the filter element body. A self-closing through-cut is provided in the middle of the elastic diaphragm body. The self-closing through-cut can be closed and is used to be opened by a connecting tube.
[0006] Preferably, the middle part of the elastic diaphragm body arches upward relative to the edge of the elastic diaphragm body, and the top surface of the middle part of the elastic diaphragm body is an arched curved surface, which is directed toward the rear end of the filter element body.
[0007] Preferably, the self-closing through incision has several interconnected branch through incisions, the branch through incisions being able to close, and the branch through incisions being used to be opened by the connected cannula.
[0008] Preferably, all the branch through-cuts are evenly arranged around the centerline of the elastic diaphragm body.
[0009] Preferably, the number of branch through-cuts is three.
[0010] Preferably, the length of the branch through the cut is 6.0 mm.
[0011] Preferably, the edge of the elastic diaphragm body has an annular flange, which is used to fix it to the front end of the filter element body.
[0012] Preferably, the main body of the elastic diaphragm is a silicone body.
[0013] Preferably, the Shore hardness of the elastic diaphragm body is 40°~60°.
[0014] This utility model also provides a filter element, including a filter element body and two sealing membranes as described above. The front end of the filter element body is provided with an inlet and an outlet. One of the sealing membranes is fixedly disposed at the inlet and can block the inlet. The other sealing membrane is fixedly disposed at the outlet and can block the outlet.
[0015] The present invention achieves the following technical advantages over the prior art: The sealing diaphragm and filter element provided by this utility model have an integrally molded elastic diaphragm body, which is used to block the inlet or outlet of the filter element body. The self-closing through-cut in the middle of the elastic diaphragm body can close and can be opened by the connecting tube, so as to achieve the following: In the natural state (before the filter element is installed and used), the self-closing through-cut remains tightly closed under the elastic contraction force of the elastic diaphragm body, achieving a normal seal and effectively preventing external pollutants from entering the filter element; In the working state (when the filter element is installed and water is flowing through), the connecting tube of the external system (such as the connecting rotor of the water circuit integration plate, which is a hollow tubular structure) will push into the elastic diaphragm. At the center of the filter body, the self-closing through-cut opening is opened to form a flow channel, allowing water to flow normally into or out of the filter body, completing the normal working process. In the disassembled state (when the filter body is disassembled), the connecting tube is withdrawn, and after the external force is removed, the self-closing through-cut opening automatically rebounds and closes instantly under the combined action of the elastic contraction force of the elastic diaphragm body and the water pressure inside the filter body, re-closing and sealing to prevent water leakage. The entire process can be achieved without the participation of any metal spring. Therefore, the sealing diaphragm and filter body provided by this utility model eliminate the traditional "plug + return spring" sealing structure, which can effectively avoid metal ion precipitation and dead volume contamination. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.
[0017] Figure 1 A schematic diagram of the sealing diaphragm provided by this utility model; Figure 2 A cross-sectional view of the sealing diaphragm provided by this utility model; Figure 3 A schematic diagram of the filter element provided for this utility model (connecting tube not inserted); Figure 4 A schematic diagram of the filter element provided by this utility model (after the connecting tube is inserted); In the diagram: 1-elastic membrane body, 2-filter element body, 3-inlet, 4-outlet, 5-self-closing through-cut, 6-ring flange, 7-connecting tube, 8-arched surface. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] The purpose of this invention is to provide a sealing membrane and filter element to solve the problems existing in the prior art, and to effectively avoid the precipitation of metal ions and dead volume contamination.
[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0021] Example 1 like Figures 1 to 4 As shown, this embodiment provides a sealing diaphragm, including an elastic diaphragm body 1. The elastic diaphragm body 1 is used to fix the water inlet 3 or water outlet 4 at the front end of the filter element body 2. The elastic diaphragm body 1 is used to block the water inlet 3 or water outlet 4 at the front end of the filter element body 2. A self-closing through-cut 5 is provided in the middle of the elastic diaphragm body 1. The self-closing through-cut 5 can be closed and is used to be opened by the connecting tube 7.
[0022] The sealing diaphragm provided in this embodiment has an integrally molded elastic diaphragm body 1, which is used to seal the inlet 3 or outlet 4 at the front end of the filter element body 2. The self-closing through-cut 5 in the middle of the elastic diaphragm body 1 can close and can be opened by the connecting tube 7, so as to achieve the following: In the natural state (before the filter element is installed and used), the self-closing through-cut 5 remains tightly closed under the elastic contraction force of the elastic diaphragm body 1, achieving a normal seal and effectively preventing external pollutants from entering the filter element; In the working state (when the filter element is installed and water is flowing through), the connecting tube 7 of the external system (such as the connecting rotor of the water circuit integration plate, which is a hollow tubular structure) will push into the center of the elastic diaphragm body 1, opening the self-closing through-cut 5. This forms a flow channel, allowing water to flow normally into or out of the filter element body 2, completing the normal working process. In the disassembled state (when the filter element is disassembled), the connecting tube 7 is withdrawn, and after the external force is removed, the self-closing through-cut 5 automatically rebounds and closes instantly under the combined action of the elastic contraction force of the elastic diaphragm body 1 and the water pressure inside the filter element, thus re-closing and sealing to prevent water leakage. The entire process can be achieved without the participation of any metal spring. Therefore, the sealing diaphragm provided in this embodiment eliminates the traditional "plug + reset spring" sealing structure, which can effectively avoid the precipitation of metal ions and dead volume pollution, and is especially suitable for UP (Ultrapure) packages (terminal polishing mixed bed filter elements) that are extremely sensitive to water quality.
[0023] In a preferred embodiment of this invention, the middle part of the elastic diaphragm body 1 arches upward relative to its edge. The top surface of the middle part of the elastic diaphragm body 1 is an arched curved surface 8, which faces the rear end of the filter element body 2. In the disassembled state (when the filter element is disassembled), when subjected to water pressure inside the filter element, according to the principle of arch bridge mechanics, the water pressure in the vertical direction (parallel to the center line of the elastic diaphragm body 1) is converted into compressive stress along the tangent of the arch (compressive stress applied to the self-closing through-cut 5 along the arched curved surface 8). The direction of this force causes the self-closing through-cut 5 to close. In the natural state (before the filter element is installed and used), the self-closing through-cut 5 remains tightly closed under the action of the elastic contraction force of the elastic diaphragm body 1 itself and the structural stress of the arched middle part of the elastic diaphragm body 1, thereby significantly enhancing the reliability, tightness and pressure resistance of the sealing effect.
[0024] As a preferred embodiment of this invention, the self-closing through-cut 5 has several interconnected branch through-cuts, which can be closed and are used to be opened by the connected cannula 7, making it easy to manufacture and use.
[0025] As a preferred embodiment of this invention, all branch through-cuts are evenly arranged around the center line of the elastic diaphragm body 1 to facilitate uniform force transmission.
[0026] As a preferred embodiment of this invention, the number of branch through-cuts is three, which is simple in structure and easy to manufacture.
[0027] As a preferred embodiment of this invention, the length of the branch through-cut is 6.0 mm, which is convenient for manufacturing and use.
[0028] As a preferred embodiment of this example, the edge of the elastic diaphragm body 1 has an annular flange 6, which is used to fix and connect with the front end of the filter element body 2, thereby effectively improving the installation stability of the elastic diaphragm body 1. In this example, the annular flange 6 is used to press and fix with the inlet 3 and the outlet 4.
[0029] As a preferred embodiment of this invention, the elastic diaphragm body 1 is made of silicone to ensure good elasticity and durability.
[0030] As a preferred embodiment of this invention, the Shore hardness of the elastic diaphragm body 1 is 40°~60° to ensure good elasticity and durability.
[0031] Example 2 like Figures 1 to 4 As shown, this embodiment provides a filter element, including a filter element body 2 and two sealing membranes as in Embodiment 1. The front end of the filter element body 2 is provided with an inlet 3 and an outlet 4. One sealing membrane is fixedly disposed at the inlet 3 and can block the inlet 3. The other sealing membrane is fixedly disposed at the outlet 4 and can block the outlet 4.
[0032] The filter element provided in this embodiment has an integrally molded elastic diaphragm body 1, which is used to seal the inlet 3 or outlet 4 at the front end of the filter element body 2. The self-closing through-cut 5 in the middle of the elastic diaphragm body 1 can close and can be opened by the connecting tube 7, so as to achieve the following: In the natural state (before the filter element is installed and used), the self-closing through-cut 5 remains tightly closed under the elastic contraction force of the elastic diaphragm body 1, achieving a normal seal and effectively preventing external pollutants from entering the filter element; In the working state (when the filter element is installed and water is flowing through), the connecting tube 7 of the external system (such as the connecting rotor of the water circuit integration plate, which is a hollow tubular structure) will push into the elastic diaphragm body 1. At the center of the diaphragm body 1, the self-closing through-cut 5 is opened to form a flow channel, allowing water to flow normally into or out of the filter element body 2, completing the normal working process. In the disassembled state (when the filter element is disassembled), the connecting tube 7 is withdrawn, and after the external force is removed, the self-closing through-cut 5 automatically rebounds and closes instantly under the combined action of the elastic contraction force of the elastic diaphragm body 1 and the water pressure inside the filter element, re-closing and sealing to prevent water leakage. The entire process can be achieved without the participation of any metal spring. Therefore, the filter element provided in this embodiment eliminates the traditional "plug + return spring" sealing structure, which can effectively avoid metal ion precipitation and dead volume contamination.
[0033] In this embodiment, the filter element body 2 specifically includes a shell, a filter element, and conventional components or designs such as an inlet channel and an outlet channel that are respectively connected to the inlet 3 and the outlet 4.
[0034] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A sealing diaphragm, characterized in that: The filter includes an elastic diaphragm body, which is fixed at the inlet or outlet of the filter element body and is used to block the inlet or outlet of the filter element body. A self-closing through-cut is provided in the middle of the elastic diaphragm body, which can be closed and is used to be opened by a connecting tube.
2. The sealing diaphragm according to claim 1, characterized in that: The middle part of the elastic diaphragm body arches upward relative to the edge of the elastic diaphragm body, and the top surface of the middle part of the elastic diaphragm body is an arched curved surface, which is directed toward the rear end of the filter element body.
3. The sealing diaphragm according to claim 1, characterized in that: The self-closing through incision has several interconnected branch through incisions, which can be closed and are used to be opened by the connected cannula.
4. The sealing diaphragm according to claim 3, characterized in that: All the branch through-cuts are evenly arranged around the centerline of the elastic diaphragm body.
5. The sealing diaphragm according to claim 4, characterized in that: The number of branch through-cuts is three.
6. The sealing diaphragm according to claim 4, characterized in that: The length of the branch through-cut is 6.0 mm.
7. The sealing diaphragm according to claim 2, characterized in that: The edge of the elastic diaphragm body has an annular flange, which is used to fix it to the front end of the filter element body.
8. The sealing diaphragm according to claim 1, characterized in that: The main body of the elastic diaphragm is silicone.
9. The sealing diaphragm according to claim 8, characterized in that: The Shore hardness of the elastic diaphragm body is 40°~60°.
10. A filter element, characterized in that: The filter includes a filter element body and two sealing membranes as described in any one of claims 1 to 9. The filter element body has an inlet and an outlet at its front end. One of the sealing membranes is fixed at the inlet and can block the inlet. The other sealing membrane is fixed at the outlet and can block the outlet.