Reverse osmosis membrane element and water purifier

Abstract

The application relates to a reverse osmosis membrane element and a water purifier, which comprise a center pipe, a filter core, at least two reverse osmosis membrane piece structures, and an axial spacing between the at least two reverse osmosis filtering structures. One of any two adjacent reverse osmosis filtering structures is located downstream of the other, and the gap between the two is configured as a turbulent flow generation space. In the reverse osmosis membrane element, the filter core is segmented into at least two reverse osmosis filtering structures, raw water flows along the center pipe from one reverse osmosis filtering structure to another, and in the process of flowing from one reverse osmosis filtering structure to another, the primary filtered raw water is disturbed and broken in the turbulent flow generation space, and then flows to the next reverse osmosis filtering structure, so as to disturb and break the concentration polarization layer, slow down the scale formation speed and the membrane piece flow attenuation speed, and improve the service life of the reverse osmosis membrane element.

Description

Technical Field

[0001] This application relates to the field of water purification technology, and in particular to reverse osmosis membrane elements and water purifiers. Background Technology

[0002] Reverse osmosis membrane elements are used to filter raw water. Raw water enters from one end face of the reverse osmosis membrane element. Under pressure, a portion of the raw water passes through the membrane surface, removing impurities such as inorganic ions, bacteria, viruses, organic matter, and colloids from the raw water to obtain high-quality pure water.

[0003] One of the core performance indicators of reverse osmosis membrane elements is their service life, and traditional reverse osmosis membrane elements have the disadvantage of short service life. Summary of the Invention

[0004] Therefore, it is necessary to provide a reverse osmosis membrane element and water purifier to address the problem of short service life of traditional reverse osmosis membrane elements.

[0005] A reverse osmosis membrane element, comprising

[0006] Central tube;

[0007] The filter element includes at least two reverse osmosis module structures, and the at least two reverse osmosis filter structures are spaced apart from each other along the axial direction of the central tube.

[0008] In this configuration, one of any two adjacent reverse osmosis filtration structures is located downstream of the other, and the gap between them is constructed as a turbulence generation space.

[0009] In the aforementioned reverse osmosis membrane element, the filter element is segmented into at least two reverse osmosis filtration structures, with each reverse osmosis filtration structure spaced apart from its adjacent reverse osmosis filtration structure along the axial direction of the central tube. The reverse osmosis filtration structure is a multi-layer filtration structure used to filter incoming raw water using the reverse osmosis principle. The filtered pure water flows into the central tube, collects, and finally flows out for user use.

[0010] Furthermore, the raw water flows axially along the central pipe from one reverse osmosis filtration structure to another. During this flow, the raw water that has undergone primary filtration is disturbed and disrupted within the turbulence-generating space before flowing back to the next reverse osmosis filtration structure. This disturbance breaks down the concentration polarization layer, thereby increasing the solute diffusion coefficient, which slows down the rate of scale formation and membrane flow rate decay, and improves the service life of the reverse osmosis membrane element.

[0011] In one embodiment, each of the reverse osmosis filter structures has a plurality of inlet channels and a plurality of product channels extending axially along the central tube. The plurality of product channels on one of two adjacent reverse osmosis filter structures are in communication with the turbulence generation space, and the plurality of inlet channels on the other of two adjacent reverse osmosis filter structures are in communication with the same turbulence generation space.

[0012] In one embodiment, a sealing ring is further included, which is fitted over any two adjacent reverse osmosis filter structures and blocks the gap between the two adjacent filter structures.

[0013] In one embodiment, each of the reverse osmosis filtration structures includes a multi-page reverse osmosis membrane assembly wound around the central tube, and each page of the reverse osmosis membrane assembly includes a reverse osmosis membrane, an inlet water guide net, and a pure water guide net.

[0014] Each of the reverse osmosis membrane sheets is folded inwards to form the inlet water channel. The reverse sides of two adjacent reverse osmosis membrane sheets are stacked on top of each other, and the product water channel is formed between two adjacent reverse osmosis membrane sheets. The inlet water guide net and the pure water guide net are respectively disposed in the inlet water channel and the product water channel.

[0015] In one embodiment, the water production channel includes a front water production channel and a rear water production channel, the rear water production channel being located downstream of the front water production channel and wound around the inside of the central tube, and communicating with the interior of the central tube.

[0016] The cross-sectional area of ​​the rear water flow channel is smaller than that of the front water flow channel.

[0017] In one embodiment, the pre-product water channel includes a plurality of sub-channels, all of which are connected to the post-product water channel.

[0018] In one embodiment, each of the reverse osmosis filtration structures includes a multi-page reverse osmosis membrane assembly wound around the central tube. Each page of the reverse osmosis membrane assembly includes a reverse osmosis membrane, an inlet water guide net, and a pure water guide net. Each reverse osmosis membrane is constructed as a double-layer structure with the front side folded inwards, and the inlet water channel is formed in the middle of the double-layer structure of the reverse osmosis membrane. The reverse sides of two adjacent reverse osmosis membranes are stacked on top of each other.

[0019] The reverse osmosis membranes are of different lengths. The ends of the reverse osmosis membranes wound on the drain side are aligned. The ends of the reverse osmosis membranes wound near the inlet side of the central tube are staggered. The sub-channel is formed between two adjacent reverse osmosis membranes at the aligned ends. The post-product water channel is formed between two adjacent reverse osmosis membranes at the staggered ends.

[0020] In one embodiment, each page of the reverse osmosis membrane assembly includes an inlet water guide net and a pure water guide net. The inlet water guide net is disposed in the inlet water channel, and the pure water guide net is disposed in both the sub-channel and the post-product water channel.

[0021] In one embodiment, the plurality of reverse osmosis membranes include at least two longer reverse osmosis membranes and at least one shorter reverse osmosis membrane.

[0022] A shorter reverse osmosis membrane is disposed between two longer reverse osmosis membranes. The portion of the two longer reverse osmosis membranes that extends beyond the shorter reverse osmosis membrane forms the post-product water flow channel. Two sub-channels are formed between the two longer reverse osmosis membranes and the shorter reverse osmosis membrane.

[0023] A water purifier includes the aforementioned reverse osmosis membrane element. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a reverse osmosis membrane element in one embodiment of this application.

[0025] Figure 2 for Figure 1 The diagram shows the unfolded structure of a reverse osmosis membrane element.

[0026] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the reverse osmosis membrane element.

[0027] Explanation of reference numerals in the attached drawings: 100, reverse osmosis membrane element; 10, central tube; 30, filter element; 50, reverse osmosis filtration structure; 52, inlet water channel; 54, product water channel; 541, pre-product water channel; 543, sub-channel; 545, post-product water channel; 56, reverse osmosis membrane assembly; 561, reverse osmosis membrane; 563, inlet water guide net; 565, pure water guide net; 70, turbulence generation space; 80, sealing ring. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] The main reason for the impact on the lifespan of reverse osmosis membrane elements is the concentration polarization phenomenon that occurs during operation. Specifically, three movements occur during the operation of a reverse osmosis membrane element: First, raw water flows through the reverse osmosis membrane from the raw water side to the low-concentration pure water side under pressure; second, solutes (particulate matter and other impurities) are carried by the raw water towards the reverse osmosis membrane and then retained by it; third, the concentration of the retained solute at the surface of the reverse osmosis membrane gradually becomes higher than the concentration of the solute in the bulk raw water solution. Under the influence of the concentration gradient, the solute (impurities) diffuses from the membrane surface into the raw water. When the velocity of solute flowing towards the membrane surface (the second movement) and the velocity of solute diffusion towards the bulk raw water solution (the third movement) reach equilibrium, a stable boundary layer corresponding to the concentration difference is formed on the membrane surface, which is called the concentration polarization boundary layer.

[0035] Concentration polarization can negatively impact the stable operation of water purification systems in the following ways: 1) When the solute concentration on the membrane surface reaches saturation, it can cause deposits or a gel layer to form, increasing permeation resistance and thus increasing the system's operating pressure; 2) Severe concentration polarization can lead to crystal precipitation, blocking the flow channels and causing system deterioration. Therefore, concentration polarization can increase the surface resistance of reverse osmosis membranes, even blocking the flow channels, reducing the lifespan of reverse osmosis membrane elements, and ultimately causing the purification system to deteriorate.

[0036] To address the aforementioned technical problems, this application provides a reverse osmosis membrane element. By segmenting the filter element into intervals, a turbulence generation space is formed between adjacent segments, disrupting and damaging the concentration polarization layer, increasing the solute diffusion rate, reducing the impact of concentration polarization on the reverse osmosis membrane element, and improving the service life of the reverse osmosis membrane element.

[0037] See Figures 1-3According to some embodiments of this application, a reverse osmosis membrane element 100 is provided, including a central tube 10 and a filter element 30. The filter element 30 includes at least two reverse osmosis filtration structures 50, which are spaced apart from each other along the axial direction of the central tube 10. In other words, the filter element 30 is segmented into at least two reverse osmosis filtration structures 50, with each reverse osmosis filtration structure 50 spaced apart from its adjacent reverse osmosis filtration structure 50 along the axial direction of the central tube 10. The reverse osmosis filtration structure 50 is a multi-layer filtration structure used to filter incoming raw water using the reverse osmosis principle. The filtered pure water can flow into the central tube 10, collect, and finally flow out for user use.

[0038] In this configuration, one of any two adjacent reverse osmosis filter structures 50 is located downstream of the other, and the gap between them is constructed as a turbulence generation space 70. That is, raw water flows axially along the central pipe 10 from one reverse osmosis filter structure 50 to another. During this flow, the raw water, after primary filtration, is disturbed and disrupted within the turbulence generation space 70 before flowing back to the next reverse osmosis filter structure 50. This disturbance breaks down the concentration polarization layer, increasing the solute diffusion coefficient, thereby slowing down scale formation and membrane flow rate decay, and extending the service life of the reverse osmosis membrane element 100.

[0039] See Figures 1-3 Each reverse osmosis filter structure 50 has multiple inlet channels 52 and multiple product channels 54 extending axially along the central tube 10. The multiple product channels 54 on one of two adjacent reverse osmosis filter structures 50 are connected to the turbulence generation space 70, and the multiple inlet channels 52 on the other of two adjacent reverse osmosis filter structures 50 are connected to the same turbulence generation space 70. Thus, after the pure water flowing independently in the multiple product channels 54 of the previous reverse osmosis filter structure 50 flows out, it mixes in the turbulence generation space, agitating the solutes contained in the pure water. This causes the mixed pure water to flow back into the multiple inlet channels 52 of the next reverse osmosis filter structure 50. This prevents scale buildup on the membrane surface of the next reverse osmosis filter structure 50, breaks up the concentration polarization layer on the membrane surface, increases the diffusion coefficient, thereby slowing down the rate of scale formation and membrane flow rate decay, and improving the service life of the reverse osmosis membrane element 100.

[0040] The reverse osmosis membrane element 100 also includes a sealing ring 80, which is sleeved on any two adjacent reverse osmosis filter structures 50 and blocks the gap between the two adjacent filter structures, so as to seal the turbulence generation space 70 through the sealing ring 80, block the water flow and prevent water leakage.

[0041] Optionally, the sealing ring 80 is formed by wrapping sealing tape between two adjacent reverse osmosis filter structures 50, which is simple and convenient to install.

[0042] Specifically, in this embodiment, the filter element 30 includes two reverse osmosis filtration structures 50 spaced apart along the axial direction of the central tube 10. The gap between the two reverse osmosis filtration structures 50 is constructed as a turbulence generation space 70. This turbulence generation space 70 disrupts the pure water's original independent flow path, agitating the solutes in the pure water and preventing them from concentrating and depositing on the surface of the membrane in the reverse osmosis filtration structure 50, thus breaking the concentration polarization layer on the membrane surface. Furthermore, the filter element 30, including the two spaced-apart reverse osmosis filtration structures 50, provides better overall water flow and filtration speed.

[0043] According to some embodiments of this application, each reverse osmosis filter structure 50 includes a multi-page reverse osmosis membrane assembly 56 wound around the central tube 10. Each reverse osmosis membrane assembly 56 includes a reverse osmosis membrane 561, an inlet water guide net 563, and a pure water guide net 565. Each reverse osmosis membrane 561 is folded inward to form an inlet water channel 52. The reverse sides of two adjacent reverse osmosis membranes 561 are stacked on top of each other, and a product water channel 54 is formed between two adjacent reverse osmosis membranes 561. The inlet water guide net 563 and the pure water guide net 565 are respectively disposed in the inlet water channel 52 and the product water channel 54.

[0044] The inlet water guide net 563 is used to separate the folded reverse osmosis membrane 561 and guide the raw water to flow into the inlet water channel 52 of the reverse osmosis membrane 561. The pure water guide net 565 is used to separate the two stacked reverse osmosis membranes 561 and guide the pure water that flows out after being filtered by the reverse osmosis membrane 561 to flow in the product water channel 54.

[0045] During the manufacturing process, the reverse osmosis membrane 561 is first folded in half, and then the inlet water guide net 563 is placed in the middle of the folded reverse osmosis membrane 561. Then, multiple reverse osmosis membranes 561 are stacked, and a pure water guide net 565 is placed between two adjacent reverse osmosis membranes 561. Finally, the stacked multi-layer reverse osmosis membranes 561, inlet water guide net 563 and pure water guide net 565 are wound onto the central tube 10 to complete the manufacturing of the filter element 30.

[0046] Next, the filter element 30 is cut into multiple reverse osmosis filter structures 50 spaced apart from each other to form a turbulence-forming space between two adjacent reverse osmosis filter structures 50. Finally, a sealing ring 80 is fitted over two adjacent reverse osmosis filter structures 50 to block the opening of the turbulence-forming space, thus completing the fabrication of the reverse osmosis membrane element 100.

[0047] According to some embodiments of this application, the water production channel 54 includes a front water production channel 541 and a rear water production channel 545. The rear water production channel 545 is located downstream of the front water production channel 541 and is wound around the inner side closer to the central tube 10, and communicates with the interior of the central tube 10. The cross-sectional area of ​​the rear water production channel 545 is smaller than that of the front water production channel 541.

[0048] During the filtration process, raw water flows into the inlet channel 52 from the side of the reverse osmosis filtration structure 50, and then flows out from the product water channel 54 after being filtered by the reverse osmosis membrane 561. The cross-sectional area of ​​the downstream product water channel 545, which is closer to the central pipe 10, is designed to be smaller, so that the pure water in the downstream product water channel 545 flows faster. The high flow rate allows the pure water to quickly pass through the central pipe 10 to the outlet, which helps to increase the pressure difference between the raw water and the pure water, making it easier for the raw water to pass through the reverse osmosis membrane 561, increasing the water flux of the reverse osmosis membrane 561, reducing the permeation resistance, reducing the operating pressure of the system, and further improving the service life of the reverse osmosis membrane element 100.

[0049] According to some embodiments of this application, the pre-production water flow channel 541 includes a plurality of sub-flow channels 543, all of which are connected to the post-production water flow channel 545. Thus, the total cross-sectional area of ​​the pre-production water flow channel 541 is equivalent to the sum of the cross-sectional areas of the plurality of sub-flow channels 543, making the total cross-sectional area of ​​the pre-production water flow channel 541 larger than the cross-sectional area of ​​the post-production water flow channel 545, thereby increasing the flow rate of pure water in the post-production water flow channel 545.

[0050] Furthermore, each reverse osmosis filter structure 50 includes a multi-page reverse osmosis membrane assembly 56 wound around the central tube 10. Each reverse osmosis membrane assembly 56 includes a reverse osmosis membrane 561, an inlet water guide net 563, and a pure water guide net 565. Each reverse osmosis membrane 561 is constructed as an inwardly folded double-layer structure, and an inlet water channel 52 is formed in the middle of the double-layer structure of the reverse osmosis membrane 561. The opposite sides of two adjacent reverse osmosis membranes 561 are stacked on top of each other. Among them, the multiple reverse osmosis membranes 561 have different lengths. The ends of the multiple reverse osmosis membranes wound on the drain side (outer side of the filter element 30) are aligned. The other ends of the multiple reverse osmosis membranes 561 wound near the water inlet side of the central tube 10 (inner side of the filter element 30) are intertwined. The two adjacent reverse osmosis membranes 561 at the aligned ends form a sub-channel 543. The two adjacent reverse osmosis membranes 561 at the intertwined ends form a post-product water channel 54.

[0051] Thus, multiple reverse osmosis membranes 561 are configured with different lengths. At the aligned end of the multiple reverse osmosis membranes 561, a sub-channel 543 is formed between each two adjacent reverse osmosis membranes 561. At the staggered end of the multiple reverse osmosis membranes 561, a post-product water channel 545 is formed only between each two adjacent reverse osmosis membranes 561 with a longer length. In this way, the number of sub-channels 543 is greater than the number of post-product water channels 545. Multiple sub-product water channels 54 are connected to one post-product water channel 545. As a result, the cross-sectional area of ​​the front product water channel 541 formed by the combination of multiple sub-product water channels 54 is greater than the cross-sectional area of ​​the post-product water channel 545, thereby increasing the flow velocity of the water in the post-product water channel 545.

[0052] Furthermore, each reverse osmosis membrane assembly 56 includes an inlet water guide net 563 and a pure water guide net 565. An inlet water guide net 563 is installed within the inlet water channel 52, and pure water guide nets 565 are installed within both the sub-channels 543 and the post-product water channel 545. The inlet water guide net 563 guides the raw water flow to the reverse osmosis membrane 561, while the pure water guide net 565 guides the filtered pure water out. Additionally, the pre-product water channel 541 includes multiple sub-channels 543. The cross-sectional area of ​​the pre-product water channel 541 is equivalent to the thickness of the multiple pure water guide nets 565 within the multiple sub-channels 543. The cross-sectional area of ​​the post-product water channel 545 is equivalent to the thickness of a single pure water guide net 565 within the post-product water channel 545. Thus, the cross-sectional area of ​​the pre-product water channel 541 is an integer multiple of the cross-sectional area of ​​the post-product water channel 545.

[0053] Specifically, the plurality of reverse osmosis membranes 561 include at least two longer reverse osmosis membranes 561 and at least one shorter reverse osmosis membrane 561. A shorter reverse osmosis membrane 561 is disposed between the two longer reverse osmosis membranes 561, and a post-permeate flow channel 545 is formed between the portions of the two longer reverse osmosis membranes 561 that extend beyond the shorter reverse osmosis membrane 561. Two sub-flow channels 543 are formed between the two longer reverse osmosis membranes 561 and the shorter reverse osmosis membrane 561, respectively.

[0054] In this way, a shorter reverse osmosis membrane 561 is placed between two longer reverse osmosis membranes 561, and multiple reverse osmosis membranes 561 are arranged in a cyclical and alternating manner to form a pre-product water channel 541 including two sub-channels 543, thereby increasing the cross-sectional area of ​​the pre-product water channel 541.

[0055] According to some embodiments of this application, this application also provides a water purifier, including the reverse osmosis membrane element 100 described in any of the above embodiments. The reverse osmosis membrane element 100 includes a central tube 10 and a filter element 30. The filter element 30 includes at least two reverse osmosis filtration structures 50, which are spaced apart from each other along the axial direction of the central tube 10. In other words, the filter element 30 is segmented into at least two reverse osmosis filtration structures 50, each reverse osmosis filtration structure 50 being spaced apart from its adjacent reverse osmosis filtration structure 50 along the axial direction of the central tube 10. The reverse osmosis filtration structure 50 is a multi-layer filtration structure used to filter incoming raw water using the reverse osmosis principle. The filtered pure water can flow into the central tube 10, collect, and finally flow out for user use.

[0056] In this configuration, one of any two adjacent reverse osmosis filter structures 50 is located downstream of the other, and the gap between them is constructed as a turbulence generation space 70. That is, raw water flows axially along the central pipe 10 from one reverse osmosis filter structure 50 to another. During this flow, the raw water, after primary filtration, is disturbed and disrupted within the turbulence generation space 70 before flowing back to the next reverse osmosis filter structure 50. This disturbance breaks down the concentration polarization layer, increasing the solute diffusion coefficient, thereby slowing down scale formation and membrane flow rate decay, and extending the service life of the reverse osmosis membrane element 100.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A reverse osmosis membrane element, characterized in that, include Central tube (10); The filter element (30) includes at least two reverse osmosis filtration structures (50), and the at least two reverse osmosis filtration structures (50) are spaced apart from each other along the axial direction of the central tube (10) outside the central tube (10); In this configuration, one of any two adjacent reverse osmosis filter structures (50) is located downstream of the other, and the gap between them is constructed as a turbulence generation space (70); each of the reverse osmosis filter structures (50) has multiple inlet channels (52) and multiple product channels (54) extending axially along the central tube (10), the multiple product channels (54) on one of the two adjacent reverse osmosis filter structures (50) are all connected to the turbulence generation space (70), and the multiple inlet channels (52) on the other of the two adjacent reverse osmosis filter structures (50) are all connected to the same turbulence generation space (70); each of the reverse osmosis filter structures (50) includes multiple reverse osmosis membrane sheets (56) wound around the central tube (10), each of the reverse osmosis membrane sheets (56) including a reverse osmosis membrane sheet (561), an inlet water guide net (563), and a pure water guide net (565). Each of the reverse osmosis membranes (561) is folded inwards to form the inlet channel (52). The reverse sides of two adjacent reverse osmosis membranes (561) are stacked on top of each other, and the product water channel (54) is formed between two adjacent reverse osmosis membranes (561). The inlet water guide net (563) and the pure water guide net (565) are respectively disposed in the inlet channel (52) and the product water channel (54). The product water channel (54) includes a front product water channel (541) and a rear product water channel (545). The rear product water channel (545) is located downstream of the front product water channel (541) and is wound around the inner side closer to the central tube (10) and communicates with the interior of the central tube (10). The cross-sectional area of ​​the rear product water channel (545) is smaller than that of the front product water channel (541). The pre-product water channel (541) includes multiple sub-channels (543), all of which are connected to the post-product water channel (545); each of the reverse osmosis filter structures (50) includes multiple reverse osmosis membrane sheets (56) wound around the central tube (10), each of the reverse osmosis membrane sheets (56) includes a reverse osmosis membrane sheet (561), each of the reverse osmosis membrane sheets (561) is constructed as a double-layer structure with the front side folded inward, and the inlet water channel (52) is formed in the middle of the double-layer structure of the reverse osmosis membrane sheet (561), and the reverse sides of two adjacent reverse osmosis membrane sheets (561) are stacked on top of each other; The reverse osmosis membranes (561) are of different lengths. The reverse osmosis membranes (561) are wound around one end aligned on the drain side and wound around the other end near the inlet side of the central tube (10) and intersect each other. The two adjacent reverse osmosis membranes (561) at the aligned ends form the sub-channel (543), and the two adjacent reverse osmosis membranes (561) at the intersect ends form the post-product water channel (545).

2. The reverse osmosis membrane element according to claim 1, characterized in that, It also includes a sealing ring (80), which is sleeved on any two adjacent reverse osmosis filter structures (50) and blocks the gap between the two adjacent filter structures.

3. The reverse osmosis membrane element according to claim 1, characterized in that, Each reverse osmosis membrane assembly (56) includes an inlet water guide net (563) and a pure water guide net (565). The inlet water guide net (563) is provided in the inlet water channel (52), and the pure water guide net (565) is provided in the sub-channel (543) and the post-product water channel (545).

4. The reverse osmosis membrane element according to claim 1 or 3, characterized in that, The plurality of said reverse osmosis membranes (561) include at least two longer reverse osmosis membranes (561) and at least one shorter reverse osmosis membrane (561). A shorter reverse osmosis membrane (561) is disposed between two longer reverse osmosis membranes (561). The portion of the two longer reverse osmosis membranes (561) that extends beyond the shorter reverse osmosis membrane (561) forms the post-product water channel (545). Two sub-channels (543) are formed between the two longer reverse osmosis membranes (561) and the shorter reverse osmosis membrane (561).

5. A water purifier, characterized in that, Includes the reverse osmosis membrane element as described in any one of claims 1-4 above.

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