A high-efficiency anti-fouling reverse osmosis membrane element

Abstract

The application discloses a kind of high-efficiency anti-fouling reverse osmosis membrane elements, comprising: cylindrical filter core main body, multiple pages of reverse osmosis membrane piece rolled in the filter core main body, and the double center tube structure, upper end cover, lower end cover are arranged in the filter core main body center;The double center tube structure includes mutually nested outer center tube and inner center tube, the upper end cover is installed in the top of the filter core main body, and forms the upper pure water cavity between the filter core main body.This application solves the problem of traditional membrane element caused by slow raw water flow rate and low water production efficiency caused by long pure water flow channel through the synchronous optimization of raw water channel and pure water channel, realizes the dual technical effects of anti-fouling and high water production.

Description

Technical Field

[0001] This invention relates to the technical field of water purification systems, and in particular to a high-efficiency anti-scaling reverse osmosis membrane element. Background Technology

[0002] Reverse osmosis membrane elements are the core components of a reverse osmosis system, and their structural design directly affects the membrane's service life, water production efficiency, and anti-scaling ability.

[0003] Traditional reverse osmosis membrane elements typically consist of multiple membrane sheets rolled into a cylindrical filter element. Their water path structure has the following drawbacks: First, the raw water typically flows in from one end of the cylinder and out from the other, resulting in a long flow channel and a wide inlet width. This leads to a slow raw water flow rate, exacerbating concentration polarization, which not only easily causes scaling but also severely affects the lifespan of the reverse osmosis membrane. Second, the pure water path is also long. Pure water needs to be collected through a water collection network and discharged through a central pipe. The long pure water flow channel generates significant resistance, limiting the pure water production and affecting water purification efficiency. Summary of the Invention

[0004] In view of the above-mentioned problems of existing reverse osmosis membrane elements, the aim is to provide a high-efficiency anti-fouling reverse osmosis membrane element.

[0005] The specific technical solution is as follows: A high-efficiency anti-fouling reverse osmosis membrane element, comprising: The filter element consists of a cylindrical filter body, multiple reverse osmosis membrane sheets rolled inside the filter body, and a dual-center tube structure located at the center of the filter body. The dual-center tube structure includes an outer center tube and an inner center tube that are nested together. The filter element has an upper end cover and a lower end cover. The upper end cover is installed on the top of the filter element body and forms an upper pure water chamber with the filter element body. The lower end cover is installed on the bottom of the filter element body and forms a lower pure water chamber with the filter element body. A wastewater channel is formed between the outer central tube and the inner central tube for discharging wastewater. A pure water outlet is formed on the top of the upper end cover, which is connected to the upper pure water chamber, for discharging a portion of the pure water. A pure water channel is formed between the outer central tube and the inner central tube, which is connected to the lower pure water chamber, for discharging the remaining pure water. The reverse osmosis membrane has a raw water inlet path located on the cylindrical surface of the filter element body, a raw water outlet path connected to the wastewater channel, and a pure water path connected to the upper pure water chamber and the lower pure water chamber, respectively.

[0006] As a further improvement and optimization of this solution, the outer central tube includes: a wastewater discharge section and a pure water discharge section coaxially connected, and a barrier ring is provided at the connection between the wastewater discharge section and the pure water discharge section. The inner central tube is coaxially arranged inside the wastewater discharge section, with its bottom abutting against the barrier ring and its top extending out from the top of the wastewater discharge section; The wastewater channel is formed between the inner wall of the wastewater discharge section, the barrier ring, and the outer wall of the inner central tube, and the pure water channel is formed between the inner wall of the pure water discharge section, the inner wall of the barrier ring, and the inner wall of the inner central tube.

[0007] As a further improvement and optimization of this solution, a barrier portion is formed radially outward on the bottom outer wall of the inner central tube, and a first sealing ring is provided between the barrier portion and the inner wall of the wastewater discharge section.

[0008] As a further improvement and optimization of this solution, a first mounting groove is coaxially provided on the outer circumferential surface of the barrier part, and the first sealing ring is coaxially installed in the first mounting groove.

[0009] As a further improvement and optimization of this solution, the outer diameter of the barrier part is matched with the inner diameter of the wastewater discharge section.

[0010] As a further improvement and optimization of this solution, the outer wall of the wastewater discharge section is provided with several through holes that communicate with the wastewater channel.

[0011] As a further improvement and optimization of this solution, the top of the wastewater discharge section extends into the pure water outlet.

[0012] As a further improvement and optimization of this solution, at least a coaxial support is provided between the wastewater discharge section and the outer wall of the inner central pipe; The coaxiality support includes a plurality of support portions formed on the outer wall of the inner central tube, the plurality of support portions being equally spaced along the circumference of the inner central tube, and each of the support portions abutting against the inner wall of the wastewater discharge section.

[0013] As a further improvement and optimization of this solution, the top outer wall of the wastewater discharge section, the top outer wall of the inner central pipe, and the outer wall of the pure water outlet are all coaxially fitted with a second sealing ring.

[0014] As a further improvement and optimization of this solution, the length of the wastewater discharge section is greater than the length of the pure water discharge section.

[0015] The positive effects of the above technical solution compared with the existing technology are: (1) The raw water inlet of the present invention is set on the cylindrical surface of the cylindrical filter element body. The raw water enters the reverse osmosis membrane from the cylindrical surface. The concentrated water produced after flowing through the membrane is connected to the outer central pipe through the outlet, forming a raw water flow direction of "cylindrical surface inlet - central pipe outlet". This design greatly increases the flow area and flow rate of the raw water, effectively suppresses concentration polarization, significantly reduces the risk of scale formation of concentrated water on the membrane surface, and thus extends the service life of the membrane element. Specifically, after the raw water enters from the cylindrical surface, it flows radially in the guide net between the membranes. The flow rate is relatively fast, which can continuously flush the membrane surface, destroy the concentration polarization layer, and reduce the tendency to form scale.

[0016] (2) The pure water path of the reverse osmosis membrane of the present invention is connected to the upper pure water chamber and the lower pure water chamber respectively. A part of the pure water flows out from the upper end face into the upper pure water chamber and then is discharged through the pure water outlet at the top of the upper end cover; another part of the pure water flows out from the lower end face into the lower pure water chamber and then is discharged through the pure water channel formed between the outer central tube and the inner central tube. This structure of pure water bidirectionally flowing from the upper and lower end faces actively shortens the flow path of pure water in the water collection network. Compared with the traditional unidirectional pure water flow design, the pure water flow resistance is greatly reduced, and the pure water production and purification efficiency are significantly improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a high-efficiency anti-fouling reverse osmosis membrane element according to the present invention; Figure 2 This is a cross-sectional view of a high-efficiency anti-fouling reverse osmosis membrane element according to the present invention; Figure 3 This is an enlarged schematic diagram of point A of a high-efficiency anti-fouling reverse osmosis membrane element of the present invention; Figure 4 This is an enlarged schematic diagram of point B of a high-efficiency anti-fouling reverse osmosis membrane element of the present invention; In the attached diagram: 1. Filter element body; 2. Upper end cap; 3. Outer central tube; 4. Inner central tube; 5. Second sealing ring; 6. First sealing ring; 7. Lower end cap; 11. Upper pure water chamber; 12. Lower pure water chamber; 13. Pure water outlet; 31. Wastewater discharge section; 32. Pure water discharge section; 33. Wastewater channel; 34. Barrier ring; 41. Pure water channel; 42. Barrier part; 43. Support part; 311. Through hole. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Figure 1 This is a schematic diagram of the structure of a high-efficiency anti-fouling reverse osmosis membrane element according to the present invention; Figure 2 This is a cross-sectional view of a high-efficiency anti-fouling reverse osmosis membrane element according to the present invention; Figure 3 This is an enlarged schematic diagram of point A of a high-efficiency anti-fouling reverse osmosis membrane element of the present invention; Figure 4 This is an enlarged schematic diagram of point B of a high-efficiency anti-fouling reverse osmosis membrane element of the present invention, as shown below. Figure 1-4 The image shows a preferred embodiment of a high-efficiency anti-fouling reverse osmosis membrane element, comprising: a cylindrical filter element body 1, multiple reverse osmosis membrane sheets wound inside the filter element body 1, a double-center tube structure disposed at the center of the filter element body 1, an upper end cap 2, and a lower end cap 7; the double-center tube structure includes an outer center tube 3 and an inner center tube 4 nested together; the upper end cap 2 is installed on the top of the filter element body 1, forming an upper pure water chamber 11 between itself and the filter element body 1; the lower end cap 7 is installed on the bottom of the filter element body 1, forming a lower pure water chamber 1 between itself and the filter element body 1. 2; A wastewater channel 33 is formed between the outer central tube 3 and the inner central tube 4 for discharging wastewater. A pure water outlet 13 is formed on the top of the upper end cover 2, which is connected to the upper pure water chamber 11, for discharging a portion of the pure water. A pure water channel 41 is formed between the outer central tube 3 and the inner central tube 4, which is connected to the lower pure water chamber 12, for discharging the remaining pure water. The raw water inlet of the reverse osmosis membrane is located on the cylindrical surface of the filter element body 1, the raw water outlet is connected to the wastewater channel 33, and the pure water channel is connected to the upper pure water chamber 11 and the lower pure water chamber 12 respectively.

[0022] Specifically, the reverse osmosis membrane element is a spiral wound membrane element.

[0023] In this application, the raw water inlet is located on the cylindrical surface of the cylindrical filter element body 1. The raw water enters the reverse osmosis membrane from the cylindrical surface. The concentrate produced after flowing through the membrane is connected to the outer central pipe 3, forming a raw water flow direction of "cylindrical surface inlet - central pipe outlet". This design greatly increases the flow area and velocity of the raw water, effectively suppresses concentration polarization, and significantly reduces the risk of scale formation on the membrane surface, thereby extending the service life of the membrane element. Specifically, after the raw water enters from the cylindrical surface, it flows radially in the guide net between the membranes at a relatively high velocity, which can continuously flush the membrane surface, destroy the concentration polarization layer, and reduce the tendency to form scale.

[0024] Meanwhile, the pure water path of the reverse osmosis membrane is connected to the upper pure water chamber 11 and the lower pure water chamber 12 respectively. A portion of the pure water flows out from the upper end face into the upper pure water chamber 11 and then is discharged through the pure water outlet 13 at the top of the upper end cover 2; another portion of the pure water flows out from the lower end face into the lower pure water chamber 12 and then is discharged through the pure water channel 41 formed between the outer central tube 3 and the inner central tube 4. This bidirectional flow structure of pure water from the upper and lower end faces actively shortens the flow path of pure water in the water collection network. Compared with the traditional unidirectional flow design of pure water, the flow resistance of pure water is greatly reduced, significantly improving the pure water production and purification efficiency. This embodiment solves the scaling problem caused by the slow flow rate of raw water and the low water production efficiency caused by the long pure water flow channel in traditional membrane elements by simultaneously optimizing the raw water path and the pure water path, achieving the dual technical effects of anti-scaling and high water production.

[0025] Furthermore, in a preferred embodiment, the outer central tube 3 includes: a wastewater discharge section 31 and a pure water discharge section 32 coaxially connected, with a baffle ring 34 disposed at the connection between the wastewater discharge section 31 and the pure water discharge section 32; the inner central tube 4 is coaxially disposed within the wastewater discharge section 31, with its bottom abutting against the baffle ring 34 and its top extending from the top of the wastewater discharge section 31; wherein, a wastewater channel 33 is formed between the inner wall of the wastewater discharge section 31, the baffle ring 34, and the outer wall of the inner central tube 4, and a pure water channel 41 is formed between the inner wall of the pure water discharge section 32, the inner wall of the baffle ring 34, and the inner wall of the inner central tube 4.

[0026] More specifically, after the raw water enters from the cylindrical surface of the cylindrical filter element body 1, it flows radially inward along the raw water guide net (coarse mesh channel) between the reverse osmosis membranes. Since the raw water guide net is sealed with glue at the upper and lower end faces of the membrane element, the raw water cannot overflow from the end face and can only converge to the only outlet - the outer central pipe 3 under pressure. This forms a raw water flow direction of "cylindrical surface inlet - central pipe outlet". This flow direction shortens the raw water channel and increases the flow rate, effectively suppressing concentration polarization and reducing the risk of scaling.

[0027] Driven by pressure, pure water passes through the reverse osmosis membrane and enters the pure water collection network (fine mesh flow channel) inside the membrane. The collection network has openings on both the upper and lower end faces of the filter element body 1 (not sealed by glue). Therefore, the pure water flows bidirectionally upward and downward along the height direction of the filter element in the collection network, entering the upper pure water chamber 11 and the lower pure water chamber 12 respectively, and finally being discharged from the pure water outlet 13 of the upper end cover 2 and the inner central tube 4. This bidirectional flow design shortens the flow path of pure water in the collection network to half the height of the filter element body 1, greatly reducing the pure water flow resistance and improving the water production efficiency.

[0028] After the wastewater (concentrated water) flows radially towards the center along the raw water diversion network, it enters the wastewater channel 33 between the outer central pipe 3 and the inner central pipe 4, and is finally discharged through the outer central pipe 3.

[0029] Furthermore, in a preferred embodiment, a barrier portion 42 is formed radially outward on the bottom outer wall of the inner central tube 4, and a first sealing ring 6 is provided between the barrier portion 42 and the inner wall of the wastewater discharge section 31.

[0030] Furthermore, in a preferred embodiment, a first mounting groove is coaxially provided on the outer circumferential surface of the barrier portion 42, and the first sealing ring 6 is coaxially installed in the first mounting groove.

[0031] Furthermore, as a preferred embodiment, the outer diameter of the barrier portion 42 matches the inner diameter of the wastewater discharge section 31.

[0032] In this embodiment, the wastewater channel 33 and the pure water channel 41 are effectively isolated by the cooperation of the barrier ring 34, the barrier part 42 and the first sealing ring 6, ensuring that the two water channels do not interfere with each other, ensuring the purity of the pure water and the smooth discharge of wastewater. This structure is compact and easy to manufacture and assemble.

[0033] Furthermore, as a preferred embodiment, the outer wall of the wastewater discharge section 31 is provided with a plurality of through holes 311 communicating with the wastewater channel 33. When concentrated water collects from the membrane into the wastewater channel 33, it can be smoothly discharged through the through holes 311 on the outer wall of the wastewater discharge section 31. This design allows the wastewater discharge section 31 to function as both a concentrated water collection and discharge unit. The through holes 311 on its outer wall are similar to a porous water collection structure, which can ensure that the concentrated water is evenly and quickly collected and discharged during the flow from the membrane to the central tube, avoiding the accumulation of concentrated water in the wastewater channel 33, thereby maintaining a stable water flow state and further enhancing the anti-scaling ability.

[0034] Furthermore, as a preferred embodiment, the top of the wastewater discharge section 31 extends into the pure water outlet 13.

[0035] Furthermore, as a preferred embodiment, at least one coaxial support is provided between the wastewater discharge section 31 and the outer wall of the inner central pipe 4. The coaxial support includes a plurality of support portions 43 formed on the outer wall of the inner central pipe 4, with the plurality of support portions 43 being equally spaced along the circumference of the inner central pipe 4, and each support portion 43 abutting against the inner wall of the wastewater discharge section 31. The support portions 43 may be ribs or protrusions extending axially, which are evenly distributed on the outer circumferential surface of the central pipe. By providing these support portions 43 and cooperating with the blocking portions 42, the positioning accuracy of the inner central pipe 4 within the wastewater discharge section 31 can be ensured, preventing it from tilting or becoming eccentric, thereby ensuring that the cross-sectional area of ​​the wastewater channel 33 and the pure water channel 41 is uniform, which is beneficial to water flow stability and sealing effect.

[0036] Furthermore, as a preferred embodiment, the top outer wall of the wastewater discharge section 31, the top outer wall of the inner central pipe 4, and the outer wall of the pure water outlet 13 are all coaxially fitted with a second sealing ring 5.

[0037] Furthermore, as a preferred embodiment, the length of the wastewater discharge section 31 is greater than the length of the pure water discharge section 32. In practical applications, the wastewater discharge section 31 needs to be longer to accommodate more concentrated water collection holes or channels, while the pure water discharge section 32 is mainly used to connect with the lower pure water chamber 12 and discharge pure water, and its length can be relatively shorter. Through this length ratio design, the space inside the dual-center tube can be reasonably allocated, so that the wastewater channel 33 has a larger volume, which is conducive to the collection and discharge of concentrated water, prevents excessive local pressure, and ensures that the pure water channel 41 is compact and effective, further improving the overall performance and manufacturing economy of the membrane element.

[0038] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency anti-fouling reverse osmosis membrane element, characterized in that, include: The filter element consists of a cylindrical filter body, multiple reverse osmosis membrane sheets rolled inside the filter body, and a dual-center tube structure located at the center of the filter body. The dual-center tube structure includes an outer center tube and an inner center tube that are nested together. The filter element has an upper end cover and a lower end cover. The upper end cover is installed on the top of the filter element body and forms an upper pure water chamber with the filter element body. The lower end cover is installed on the bottom of the filter element body and forms a lower pure water chamber with the filter element body. A wastewater channel is formed between the outer central tube and the inner central tube for discharging wastewater. A pure water outlet is formed on the top of the upper end cover, which is connected to the upper pure water chamber, for discharging a portion of the pure water. A pure water channel is formed between the outer central tube and the inner central tube, which is connected to the lower pure water chamber, for discharging the remaining pure water. The reverse osmosis membrane has a raw water inlet path located on the cylindrical surface of the filter element body, a raw water outlet path connected to the wastewater channel, and a pure water path connected to the upper pure water chamber and the lower pure water chamber, respectively.

2. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 1, characterized in that, The outer central tube includes: a wastewater discharge section and a pure water discharge section coaxially connected, and a barrier ring is provided at the connection between the wastewater discharge section and the pure water discharge section. The inner central tube is coaxially arranged inside the wastewater discharge section, with its bottom abutting against the barrier ring and its top extending out from the top of the wastewater discharge section; The wastewater channel is formed between the inner wall of the wastewater discharge section, the barrier ring, and the outer wall of the inner central tube, and the pure water channel is formed between the inner wall of the pure water discharge section, the inner wall of the barrier ring, and the inner wall of the inner central tube.

3. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 2, characterized in that, The bottom outer wall of the inner central tube forms a barrier portion radially outward, and a first sealing ring is provided between the barrier portion and the inner wall of the wastewater discharge section.

4. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 3, characterized in that, A first mounting groove is coaxially provided on the outer circumferential surface of the barrier part, and the first sealing ring is coaxially installed in the first mounting groove.

5. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 4, characterized in that, The outer diameter of the barrier is matched with the inner diameter of the wastewater discharge section.

6. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 2, characterized in that, The outer wall of the wastewater discharge section has several through holes that communicate with the wastewater channel.

7. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 2, characterized in that, The top of the wastewater discharge section extends into the pure water outlet.

8. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 3, characterized in that, At least one coaxial support is provided between the wastewater discharge section and the outer wall of the inner central pipe; The coaxiality support includes a plurality of support portions formed on the outer wall of the inner central tube, the plurality of support portions being equally spaced along the circumference of the inner central tube, and each of the support portions abutting against the inner wall of the wastewater discharge section.

9. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 2, characterized in that, The top outer wall of the wastewater discharge section, the top outer wall of the inner central tube, and the outer wall of the pure water outlet are all coaxially fitted with a second sealing ring.

10. The high-efficiency anti-fouling reverse osmosis membrane element according to claim 2, characterized in that, The length of the wastewater discharge section is greater than the length of the pure water discharge section.

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