Multi-stage filtration RO filter element
By incorporating a multi-stage filtration design—including PP cotton, antiscalant filter, and ion exchange resin—the scaling problem of RO membranes is solved, achieving efficient filtration and convenient maintenance, and extending the membrane's service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI WANCHENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
- Filing Date
- 2025-04-28
- Publication Date
- 2026-05-19
AI Technical Summary
When existing RO filter cartridges are used in hard water areas, scale easily forms on the membrane surface, leading to reduced filtration efficiency and shortened service life, and making it difficult to replace filter components conveniently.
Design a multi-stage RO filter element, including PP cotton, scale inhibitor filter element and ion exchange resin, to avoid scaling through multi-stage filtration, and to achieve convenient component loading and unloading through annular rubber ring and limiting groove.
It effectively avoids scaling on the RO membrane surface, improves filtration efficiency, extends the membrane's service life, and facilitates the maintenance and replacement of the filter components, ensuring continuous and efficient filtration.
Smart Images
Figure CN224258430U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of filter technology, and in particular to a multi-stage RO filter. Background Technology
[0002] RO filter cartridges are the core components of reverse osmosis filtration systems. They are mainly used to remove dissolved salts, heavy metals, bacteria, viruses, organic matter and other impurities from water, thereby providing high-purity drinking water. They are widely used in various household and industrial water purification equipment.
[0003] Currently, most RO filter cartridges on the market use a single RO membrane filtration design. While this structure can effectively filter fine particles, it has a low retention efficiency for large particles and organic pollutants. Especially when used in hard water areas, high concentrations of calcium and magnesium ions in the water can easily form scale on the membrane surface, which not only reduces filtration efficiency but also significantly shortens the lifespan of the RO membrane. Therefore, to solve this problem, designing a multi-stage RO filter cartridge is something we need to consider. Utility Model Content
[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a multi-stage RO filter element. Addressing usage issues, it incorporates a filtration assembly that performs multi-stage filtration before the water source enters the filter element body. This prevents scale buildup on the RO reverse osmosis membrane surface, which would affect filtration efficiency and lifespan. Furthermore, the filtration assembly can be easily installed and removed for maintenance and replacement, ensuring continuous filtration.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A multi-stage RO filter element includes a filter element body containing an RO reverse osmosis membrane, a permeate column penetrating the center of the filter element body, and a first sealing ring on the outer side of the filter element body. A filter assembly includes an annular connector positioned at the front of the filter element body, a circular connecting plate fixed to the inner side of the annular connector, a sealing cap at the front of the annular connector, and a PP cotton, a scale inhibitor filter element, and an ion exchange resin arranged sequentially from front to back between the rear side of the sealing cap and the front side of the circular connecting plate.
[0007] Preferably, the sealing cap has a plurality of first water inlet holes, and the sealing cap has a first cylindrical through groove in the middle.
[0008] Preferably, the circular connecting plate has a plurality of second water inlets, and the circular connecting plate has a second cylindrical through groove in the middle.
[0009] Preferably, a second sealing ring is provided on the rear side of the sealing cover, and the rear side of the second sealing ring is fitted with the front side of the annular connector.
[0010] Preferably, an annular rubber ring is fixedly connected to the inner side of the annular connector, and an annular limiting groove is provided on the front side of the filter element body.
[0011] Preferably, the annular rubber ring is fitted with an annular limiting groove.
[0012] Compared with the prior art, the advantages of this utility model are as follows:
[0013] The filter assembly is equipped with PP cotton, antiscalant filter cartridges, and ion exchange resin placed within the annular connector. This allows for efficient multi-stage filtration of water before it enters the filter cartridge body, effectively preventing scale buildup on the membrane surface and ensuring the filtration efficiency of the RO reverse osmosis membrane. The annular rubber ring and annular limiting groove facilitate convenient and quick assembly and disassembly of the entire filter assembly from the filter cartridge body, enabling maintenance and replacement of the PP cotton, antiscalant filter cartridges, and ion exchange resin, thus ensuring efficient and continuous filtration. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of a multi-stage RO filter element proposed in this utility model;
[0015] Figure 2 for Figure 1 A schematic diagram of the structure after removing the filter components;
[0016] Figure 3 This is a front sectional view of the filter element body;
[0017] Figure 4 This is a schematic diagram of the filter assembly.
[0018] Figure 5 for Figure 4 Rear view;
[0019] Figure 6 for Figure 4 A sectional view.
[0020] In the diagram: 1 Filter cartridge body, 2 RO reverse osmosis membrane, 3 Permeate core column, 4 First sealing ring, 5 Annular connector, 6 Circular connecting plate, 7 Sealing cap, 8 PP cotton, 9 Antiscalant filter cartridge, 10 Ion exchange resin, 11 First water inlet, 12 First cylindrical through groove, 13 Second water inlet, 14 Second cylindrical through groove, 15 Second sealing ring, 16 Annular rubber ring, 17 Annular limiting groove. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0022] Reference Figures 1-6 A multi-stage RO filter element includes a filter element body 1, with the front side of the filter element body 1 being the water inlet and the rear side being the water outlet. An RO reverse osmosis membrane 2 is installed inside the filter element body 1, which can remove dissolved salts, heavy metals, bacteria, viruses, organic matter and other impurities in the water to provide high-purity drinking water. A permeate core column 3 is installed through the center of the filter element body 1, which can collect and transport the water source that has passed through the RO reverse osmosis membrane 2. A first sealing ring 4 is installed on the outer side of the filter element body 1, and an annular limiting groove 17 is opened on the front side of the filter element body 1.
[0023] The system also includes a filter assembly, which includes an annular connector 5 located on the front side of the filter element body 1. A circular connecting plate 6 is fixed to the inner side of the annular connector 5. The circular connecting plate 6 has multiple second water inlets 13 for water to pass through. A second cylindrical groove 14 is located in the middle of the circular connecting plate 6 for the liquid core column 3 to pass through. A sealing cover 7 is located on the front side of the annular connector 5. The sealing cover 7 is threaded to the annular connector 5. A multiple first water inlets 11 are located on the sealing cover 7 for water to pass through. A first cylindrical groove 12 is located in the middle of the sealing cover 7 for the liquid core column 3 to pass through. Between the rear side of the sealing cover 7 and the front side of the circular connecting plate 6, PP cotton 8, scale inhibitor filter element 9, and ion exchange resin 10 are arranged sequentially from front to back. PP cotton 8 can remove large particulate impurities in the water source. Scale inhibitor filter element 9 can prevent calcium and magnesium ions from scaling. Ion exchange resin 10 can soften water quality and further reduce the risk of scaling of the RO reverse osmosis membrane 2.
[0024] The sealing cover 7 has a second sealing ring 15 on its rear side. The rear side of the second sealing ring 15 fits against the front side of the annular connector 5, which can ensure that the water source inside the annular connector 5 will not leak out. The inner side of the annular connector 5 is fixedly connected with an annular rubber ring 16. The annular rubber ring 16 cooperates with the annular limiting groove 17. By embedding the annular rubber ring 16 into the annular limiting groove 17, the annular connector 5 and the filter element body 1 can be easily sealed.
[0025] In this invention, during use, water is delivered to the annular connector 5 through multiple first water inlets 11 on the sealing cover 7, and finally delivered to the filter element body 1 through multiple second water inlets 13 on the circular connecting plate 6. During delivery, the water comes into contact with PP cotton 8, scale inhibitor filter element 9, and ion exchange resin 10 in sequence. PP cotton 8 can remove large particulate impurities in the water, scale inhibitor filter element 9 can prevent calcium and magnesium ions from scaling through components such as polyphosphate and silicon phosphate crystals, and ion exchange resin 10 can soften the water quality and further reduce the risk of scaling of RO reverse osmosis membrane 2 by replacing calcium and magnesium ions with sodium ions. In this way, by performing multi-stage filtration on the water before it enters the filter element body 1, scaling on the surface of RO reverse osmosis membrane 2 is avoided, which affects the filtration efficiency and ensures the service life of RO reverse osmosis membrane 2.
[0026] After being filtered through multiple stages by the filter components, the water source enters the RO reverse osmosis membrane 2 of the filter element body 1. High pressure is used to force water molecules through the RO reverse osmosis membrane 2. Most of the dissolved pollutants are trapped because their volume is larger than the membrane pore size, thus achieving efficient purification of the water source. The water source filtered through the RO reverse osmosis membrane 2 will flow along the inner wall of the permeate core column 3 and finally be discharged from the rear end of the permeate core column 3.
[0027] When the PP cotton 8, scale inhibitor filter element 9, and ion exchange resin 10 need to be replaced and maintained after long-term use, the entire filter assembly can be pulled forward to disengage the annular rubber ring 16 from the annular limiting groove 17, thereby removing the entire filter assembly. Then, rotate the sealing cover 7 to separate it from the annular connector 5. At this point, the PP cotton 8, scale inhibitor filter element 9, and ion exchange resin 10 inside the annular connector 5 can be replaced. After replacement, reconnect the sealing cover 7 to the annular connector 5 by thread, then align the rear side of the annular connector 5 with the front side of the filter element body 1 and insert it, so that the annular rubber ring 16 is re-embedded into the annular limiting groove 17. This allows for convenient replacement and maintenance of the PP cotton 8, scale inhibitor filter element 9, and ion exchange resin 10, ensuring efficient and continuous filtration of the water source by the filter assembly.
[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A multi-stage RO filter element, characterized in that, include: The filter element body (1) is provided with an RO reverse osmosis membrane (2) inside the filter element body (1), and a permeate core column (3) is provided through the center of the filter element body (1). A first sealing ring (4) is provided on the outside of the filter element body (1). The filter assembly includes an annular connector (5) disposed on the front side of the filter element body (1), a circular connecting plate (6) fixed on the inner side of the annular connector (5), a sealing cover (7) disposed on the front side of the annular connector (5), the sealing cover (7) being threadedly connected to the annular connector (5), and PP cotton (8), scale inhibitor filter element (9), and ion exchange resin (10) being disposed sequentially from front to back between the rear side of the sealing cover (7) and the front side of the circular connecting plate (6).
2. The multi-stage RO filter element according to claim 1, characterized in that, The sealing cover (7) has a plurality of first water inlet holes (11) and a first cylindrical through groove (12) is provided in the middle of the sealing cover (7).
3. The multi-stage RO filter element according to claim 1, characterized in that, The circular connecting plate (6) has multiple second water inlets (13), and the circular connecting plate (6) has a second cylindrical through groove (14) in the middle.
4. The multi-stage RO filter element according to claim 1, characterized in that, The rear side of the sealing cover (7) is provided with a second sealing ring (15), and the rear side of the second sealing ring (15) is in contact with the front side of the annular connector (5).
5. A multi-stage RO filter element according to claim 1, characterized in that, The inner side of the annular connector (5) is fixedly connected with an annular rubber ring (16), and the front side of the filter element body (1) is provided with an annular limiting groove (17).
6. A multi-stage RO filter element according to claim 5, characterized in that, The annular rubber ring (16) is fitted with the annular limiting groove (17).