A filter cartridge device with a double-layer RO membrane structure
By employing a double-layer RO membrane structure in the reverse osmosis (RO) machine, the concentrated water filtered by the first RO module is used as the feed water for the second module, achieving a concentric circle arrangement. This solves the scaling and clogging problem of traditional RO machines, extends their service life, and reduces flow requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG QINYUAN WATER TREATMENT S T
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-10
AI Technical Summary
Traditional reverse osmosis (RO) machines are prone to scaling and clogging in areas with high TDS values. Existing technologies, such as adding scale inhibitors, increase costs or reduce recovery rates, leading to increased wastewater and limited effectiveness.
The device employs a dual-layer RO membrane structure, integrating the first and second RO modules into the same unit. The concentrated water produced by the first module is used as the feed water for the second module. The two modules are arranged in concentric circles, and the feed water flows sequentially through the surfaces of the two RO membranes, extending the flow length, increasing the flow rate, and reducing clogging.
It effectively reduces scaling and clogging, extends the service life of RO membranes, reduces flow requirements, decreases device size, increases water flow rate, and extends the service life of RO membranes.
Smart Images
Figure CN224477978U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water treatment technology, and in particular to a filter cartridge device with a double-layer RO membrane structure. Background Technology
[0002] With product advancements and societal development, reverse osmosis (RO) technology has seen unprecedented growth, becoming one of the core technologies for addressing water scarcity and water quality safety. RO machines employ corresponding technologies to meet different application scenarios and needs. For example, in applications with high TDS values where RO membrane scaling and clogging are a concern, traditional RO machines utilize the following technologies: 1. Adding scale inhibitors, which alleviates scaling and clogging but also increases costs; 2. Reducing the RO membrane recovery rate, but this also reduces the water flow velocity across the RO membrane surface, offering little help in preventing scaling and clogging, and increases wastewater production, resulting in poor market feedback. Utility Model Content
[0003] This invention aims to overcome the deficiencies in the prior art by providing a filter cartridge device with a double-layer RO membrane structure. The first and second RO modules are integrated within the same device and arranged concentrically. The concentrated water from the first RO module is used as the inlet water for the second RO module, with only the second RO module discharging concentrated water. The inlet water flows sequentially across the surfaces of the first and second RO membranes, effectively extending the inlet channel length. Under the same flow rate, a longer channel results in a faster flow velocity, thus accelerating the water flow rate across the surfaces of the first and second RO modules. This effectively reduces scaling and clogging, increasing the lifespan of the RO membranes.
[0004] To achieve the above objectives, this utility model provides a filter cartridge device with a double-layer RO membrane structure, including a first RO module, a second RO module, a lower end cap, and a pure water connector;
[0005] The first RO module includes a first central tube and a first-stage RO membrane disposed outside the first central tube. The first central tube is provided with a partition plate that divides its inner cavity into an upper outlet section and a lower installation section. A pure water inlet is provided in the middle of the partition plate. A partition cylinder is provided on the upper surface of the partition plate corresponding to the outer periphery of the pure water inlet. A pure water connector is embedded in the partition cylinder and the pure water connector and the partition plate cooperate to form a pure water cavity. A number of connecting blocks are arranged circumferentially between the outer wall of the partition cylinder and the inner wall of the outlet section, and adjacent connecting blocks cooperate to form a concentrate channel. The partition plate is provided with a concentrate through hole corresponding to at least one concentrate channel. At least one of the connecting blocks is provided with a connecting channel for pure water generated by the first-stage RO membrane to flow into the pure water cavity.
[0006] The second RO module is inserted into the installation section of the first central tube. The second RO module includes a second central tube and a second-stage RO membrane disposed outside the second central tube. The lower port of the second central tube is closed and its upper port is connected to the pure water inlet on the partition plate. Several pure water through holes are provided in the area of the second central tube corresponding to the second-stage RO membrane.
[0007] The lower end cap is fitted onto the lower end of the first RO module, and the lower end cap and the ends of the first and second RO modules cooperate to form a concentrated water path for the concentrated water produced by the first-stage RO membrane filtration to pass through.
[0008] Further configuration: the first RO module and the second RO module are arranged in a concentric circle structure.
[0009] The design further includes: a concave surface is provided around the outer wall of the first central tube at the corresponding connecting channel, and at least one guide groove is provided along the lower edge of the concave surface to guide pure water into the concave surface.
[0010] The lower end is further configured with a plurality of support ribs on its bottom wall for supporting the first RO module and the second RO module so that they are arranged with gaps to form a concentrate path.
[0011] Further configuration: several of the aforementioned support ribs are arranged radially on the lower end cap.
[0012] The second RO module is further configured such that a partition sleeve is fitted at its lower end, which abuts against the inner wall of the first central tube, and the lower end of the partition sleeve is a horn structure.
[0013] The configuration is further improved by providing a sleeve structure around the lower surface of the partition plate corresponding to the outer edge of the pure water inlet, and inserting the upper end of the second central tube into the sleeve of the partition plate.
[0014] A further feature is provided: a first sealing ring is provided between the second central tube and the sleeve.
[0015] A second sealing ring is further provided between the outer wall of the pure water connector and the inner wall of the separator cylinder.
[0016] Compared with existing technologies, this utility model has a simple and reasonable structure, integrating the first RO module and the second RO module into the same device with the two RO modules arranged concentrically, thus effectively reducing the overall volume of the device. At the same time, the concentrated water produced by the first RO module is used as the inlet water for the second RO module, and only the second RO module discharges concentrated water. The inlet water flows sequentially through the surfaces of the first-stage RO membrane and the second-stage RO membrane, effectively extending the length of the inlet water channel. Under the same flow rate, the longer the channel, the faster the flow rate. This accelerates the water flow rate on the surfaces of the first and second RO modules, which can effectively reduce scaling and clogging, and increase the service life of the RO membrane. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the axial cross-sectional structure of a filter cartridge device with a double-layer RO membrane structure according to this utility model. Figure 1 ;
[0018] Figure 2 This is a schematic diagram of the axial cross-sectional structure of the filter element device. Figure 2 ;
[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the first central tube. Figure 1 ;
[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the first central tube. Figure 2 ;
[0021] Figure 5 This is a three-dimensional structural diagram of the second central tube;
[0022] Figure 6 This is a three-dimensional structural diagram of the lower end cap.
[0023] The following reference numerals are marked on the accompanying drawings:
[0024] 100. First RO module; 10. First central tube; 11. Separator plate; 111. Pure water inlet; 112. Concentrate through-hole; 12. Separator cylinder; 13. Connecting block; 131. Connecting channel; 14. Concave surface; 141. Guide groove; 15. Sleeve; 20. First stage RO membrane;
[0025] 200. Second RO module; 30. Second central tube; 31. Closed structure; 32. Pure water through-hole; 40. Second-stage RO membrane; 50. First sealing ring; 60. Separator sleeve;
[0026] 300. Pure water connector; 310. Second sealing ring; 400. Lower end cap; 410. Support rib;
[0027] C. Pure water chamber; N1. Concentrate chamber; N2. Concentrate channel; N3. Concentrate path. Detailed Implementation
[0028] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.
[0029] This utility model discloses a filter cartridge device with a double-layer RO membrane structure, such as... Figure 1 and Figure 2 As shown, this device is used for installation inside a filter bottle and includes a first RO module 100, a second RO module 200, a lower end cap 400, and a pure water connector 300. The inlet water of the filter cartridge first undergoes initial purification filtration through the first RO module 100 (top inlet). The concentrated water produced by the first RO module 100 is used as the inlet water for the second RO module 200 and undergoes further purification filtration through the second RO module 200. The pure water produced by the first RO module 100 and the second RO module 200 is discharged together through the pure water connector 300. The concentrated water is produced and discharged only by the second RO module 200. At the same time, the inlet water needs to pass through the surfaces of the first-stage RO membrane and the second-stage RO membrane in sequence. Under the same flow rate, the longer the flow channel, the faster the flow rate. This speeds up the flow rate of water on the surface of the filter cartridge, which can reduce scaling and clogging and increase the service life of the RO membrane.
[0030] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the first RO module 100 includes a first central tube 10 and a first-stage RO membrane 20 wrapped around the first central tube 10. A partition plate 11 is provided inside the first central tube 10 to divide its inner cavity into an upper outlet section and a lower installation section. A pure water inlet 111 is provided at the middle part (preferably the center position) of the partition plate 11, and a partition cylinder 12 is provided around the outer periphery of the pure water inlet 111 on the upper surface of the partition plate 11. A pure water connector 300 is embedded in the partition cylinder 12 so that the pure water connector 300 and the partition plate 11 cooperate to form a pure water cavity C. Preferably, a second sealing ring 310 is provided between the outer wall of the pure water connector 300 and the inner wall of the partition cylinder 12 to ensure a tight seal between them. The sealing effect is as follows: A number of connecting blocks 13 are arranged circumferentially between the outer wall of the separator cylinder 12 and the inner wall of the water distribution section, and at least one connecting block 13 is provided with a connecting channel 131 that connects the pure water chamber C to the outside of the first central tube 10. The connecting channel is located in the area wrapped by the first-stage RO membrane 20. Thus, the pure water produced by the first-stage RO membrane 20 can flow into the pure water chamber C through the connecting channel 131 and be discharged through the pure water connector 300. At the same time, the outlet section and the separator cylinder 12 cooperate to form a concentrated water chamber N1, and two adjacent connecting blocks 13 cooperate to form a concentrated water channel N2 for concentrated water to flow into the concentrated water chamber N1. The separator plate 11 is provided with a concentrated water through hole 112 connected to at least one concentrated water channel N2.
[0031] In the above schemes, the preferred option is as follows: Figure 3 As shown, a concave surface 14 is provided around the outer wall of the first central tube 10 corresponding to the connecting channel 131. At least one guide groove 141 is provided on the lower edge of the concave surface 14 for guiding pure water into the concave surface 14. Preferably, there are multiple guide grooves and they extend along the outer axial direction of the first central tube 10. In this way, the pure water generated below the concave surface 14 of the first RO module 100 can flow into the concave surface 14 through the guide groove 141 and into the pure water chamber C through the connecting channel 131.
[0032] In this embodiment, as Figure 1 , Figure 2 and Figure 5As shown, the second RO module 200 is inserted into the mounting section of the first central tube 10. The second RO module 200 includes a second central tube 30 and a second-stage RO membrane 40 wrapped around the second central tube 30. The lower end of the second central tube 30 is a closed structure 31, and its upper outlet is connected to the pure water through-hole 32 on the partition plate 11. Several pure water through-holes 32 are provided in the area of the second central tube 30 corresponding to the area wrapped by the second-stage RO membrane 40. Thus, the pure water produced by the purification and filtration of the second-stage RO membrane 40 flows into the second central tube 30 through the pure water through-holes 32, and then into the pure water chamber C through the pure water inlet 111. The concentrated water produced by the purification of the second-stage RO membrane 40 flows through the partition plate 111. The concentrate through-hole 112 on the partition plate 11 flows into the concentrate channel N2 and then into the concentrate chamber N1. Preferably, a sleeve 15 structure is provided around the lower surface of the partition plate 11 corresponding to the outer edge of the pure water inlet 111. The upper end of the second central tube 30 is inserted into the sleeve 15 and a first sealing ring 50 is provided between the two to ensure sealing. This effectively ensures the concentricity between the first RO module 100 and the second RO module 200, so that the two are arranged in a concentric circle structure. This effectively reduces the overall volume of the filter element device. At the same time, the filter element device of this patent has a low flow requirement for the pump. Thus, a relatively small pump can be selected for the reverse osmosis machine, thereby reducing the volume of the reverse osmosis machine.
[0033] In the above scheme, the lower end of the second RO module 200 corresponding to the second-stage RO membrane 40 is fitted with a separator sleeve 60 for abutting against the inner wall of the first central tube 10. The lower port of the separator sleeve 60 has a flared structure, which makes it easy for the separator sleeve 60 to be inserted into the second RO module 200 from the lower port of the first central tube 10 and abut against the inner wall of the first central tube 10 to block the water flow below from passing through the gap between the second RO module 200 and the first RO module 100.
[0034] In this embodiment, as Figure 1 , Figure 2 and Figure 6As shown, the lower end cap 400 is fitted onto the lower end of the first RO module 100, and the lower end cap 400 and the ends of the first and second RO modules 200 cooperate to form a concentrated water path N3 for the concentrated water produced by the first-stage RO membrane 20 to pass through. This structure allows the concentrated water produced by the first RO module 100 to be used as the inlet water for the second RO module 200. Specifically, a plurality of support ribs 410 are provided on the bottom wall of the lower end for the first RO module 100 and the second RO module 200 to rest on. The lower ends of the first RO module 100 and the lower ends of the second RO module 200 are both rested on the support ribs 410, so that the lower ends of the first RO module 100 and the lower ends of the second RO module 200 are arranged with a gap with the bottom wall of the lower end cap 400 to form a concentrated water path N3 for the concentrated water to pass through. Preferably, the plurality of support ribs 410 are arranged radially on the lower end cap 400, so that the external concentrated water converges towards the center between the adjacent support ribs 410.
[0035] Compared with the prior art, this utility model has a simple and reasonable structure, integrating the first RO module and the second RO module into the same device and arranging the two RO modules in concentric circles; at the same time, the concentrated water produced by the first RO module is used as the inlet water of the second RO module, and only the second RO module discharges concentrated water; the inlet water flows sequentially through the surface of the first-stage RO membrane and the surface of the second-stage RO membrane, effectively extending the length of the inlet water channel. Under the same flow rate, the longer the channel, the faster the flow rate. This accelerates the water flow rate on the surfaces of the first RO module and the second RO module, which can effectively reduce scaling and clogging and increase the service life of the RO membrane.
[0036] The above-disclosed embodiments are merely examples of the present utility model. However, the present utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.
Claims
1. A filter cartridge device with a double-layer RO membrane structure, characterized in that, Includes the first RO module, the second RO module, the lower end cap, and the pure water connector; The first RO module includes a first central tube and a first-stage RO membrane disposed outside the first central tube. The first central tube is provided with a partition plate that divides its inner cavity into an upper outlet section and a lower installation section. A pure water inlet is provided in the middle of the partition plate. A partition cylinder is provided on the upper surface of the partition plate corresponding to the outer periphery of the pure water inlet. A pure water connector is embedded in the partition cylinder and the pure water connector and the partition plate cooperate to form a pure water cavity. A number of connecting blocks are arranged circumferentially between the outer wall of the partition cylinder and the inner wall of the outlet section, and adjacent connecting blocks cooperate to form a concentrate channel. The partition plate is provided with a concentrate passage hole communicating with at least one concentrate channel. At least one of the connecting blocks is provided with a connecting channel for pure water generated by the first-stage RO membrane to flow into the pure water cavity. The second RO module is inserted into the installation section of the first central tube. The second RO module includes a second central tube and a second-stage RO membrane disposed outside the second central tube. The lower port of the second central tube is closed and its upper port is connected to the pure water inlet on the partition plate. Several pure water through holes are provided in the area of the second central tube corresponding to the second-stage RO membrane. The lower end cap is fitted onto the lower end of the first RO module, and the lower end cap and the ends of the first and second RO modules cooperate to form a concentrated water path for the concentrated water produced by the first-stage RO membrane filtration to pass through.
2. The filter cartridge device with a double-layer RO membrane structure according to claim 1, characterized in that, The first RO module and the second RO module are arranged in a concentric circle structure.
3. A filter cartridge device with a double-layer RO membrane structure according to claim 1, characterized in that, The outer wall of the first central tube is provided with a concave surface around the corresponding connecting channel, and at least one guide groove is provided along the lower edge of the concave surface to guide pure water into the concave surface.
4. A filter cartridge device with a double-layer RO membrane structure according to claim 1, characterized in that, The bottom wall of the lower end is provided with several support ribs for the first RO module and the second RO module to be placed so that they are arranged with gaps to form a concentrate path.
5. A filter cartridge device with a double-layer RO membrane structure according to claim 4, characterized in that, Several of the aforementioned support ribs are arranged radially on the lower end cap.
6. A filter cartridge device with a double-layer RO membrane structure according to claim 1, characterized in that, The second RO module is fitted with a partition sleeve at its lower end that abuts against the inner wall of the first central tube, and the lower end of the partition sleeve has a horn structure.
7. A filter cartridge device with a double-layer RO membrane structure according to claim 1, characterized in that, A sleeve structure is provided around the lower surface of the partition plate corresponding to the outer edge of the pure water inlet, and the upper end of the second central tube is inserted into the sleeve of the partition plate.
8. A filter cartridge device with a double-layer RO membrane structure according to claim 7, characterized in that, A first sealing ring is provided between the second central tube and the sleeve.
9. A filter cartridge device with a double-layer RO membrane structure according to claim 1, characterized in that, A second sealing ring is provided between the outer wall of the pure water connector and the inner wall of the separator cylinder.