Commercial spiral-wound membrane element structure and winding method

Abstract

The invention relates to the technical field of reverse osmosis membrane filter elements, in particular to a commercial spiral wound membrane element structure and a winding method. The membrane element structure is rolled by the method. The method comprises the following steps: respectively obtaining the main water production assembly and the by-product water assembly; the by-product water components are respectively arranged between each main folding membrane and the adjacent main product water flow guide cloth; the by-product water components are sequentially arranged in a staggered manner far away from the main product water pipe; taking the main water production pipe as a winding starting point, winding the main folding membrane in the length direction of the main water production flow guide cloth, and sequentially winding the staggered byproduct water production assemblies in a linkage manner until the commercial spiral wound membrane element structure is obtained through winding. The filling density, the water yield and the water production efficiency of the membrane element can be improved.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis membrane filter technology, and in particular to a commercial spiral wound membrane element structure and winding method. Background Technology

[0002] Membrane technology is widely used in water treatment due to its advantages such as simple process, high packing density, good effluent quality, ease of automation, and convenient maintenance. Among them, spiral wound membrane elements have become the mainstream choice for commercial filtration devices due to their compact structure, high membrane area packing density, and low cost.

[0003] In commercial settings such as shopping mall drinking water, community purified water, office drinking water, and the catering industry, water purification equipment often faces the contradiction of limited installation space but high water production demand. The limited installation space severely restricts the size selection of commercial spiral wound membrane elements, with the largest available size typically being the 4040 model, which has a diameter of 4 inches (approximately 0.1 meters) and a length of 40 inches (approximately 1.016 meters). However, the packing density of this 4040 model membrane element (approximately 1146~1528 m³ / s) is limited. 2 / m 3 On the contrary, it is lower than the smaller diameter 1812 model membrane element (approximately 1495~2315 μm). 2 / m 3 Considering that the packing density of a membrane element refers to the effective membrane area contained within a unit volume of the membrane element, it is usually expressed in m³. 2 / m 3 The unit is ρ. The packing density of a membrane element directly reflects its space utilization efficiency. A higher value means more filtration area can be provided within the same external dimensions, which is beneficial for improving water production capacity, i.e., increasing the water output. Therefore, analyzing from the perspective of membrane element packing density, the packing density of the 4040 model membrane element is lower than that of the 1812 model membrane element, resulting in a lower water output for the 4040 model membrane element compared to the 1812 model. The main reason for this phenomenon is: In practical commercial applications of membrane elements, it is necessary to consider not only limited installation space and high permeate volume requirements, but also high permeate efficiency requirements. To increase permeate volume within limited commercial installation space, it is often necessary to increase the membrane element diameter (e.g., by increasing the membrane length) to improve the membrane element packing density. However, when increasing the membrane element diameter, to maintain high permeate efficiency, the traditional solution is to use thicker permeate flow distribution fabric and a larger diameter central tube to reduce permeate side pressure. But this directly leads to a decrease in membrane element packing density, which is actually lower than that of smaller diameter membrane elements. Conversely, if high permeate volume requirements are not considered and only high permeate efficiency is desired, increasing the membrane length can increase the membrane element packing density and thus increase permeate volume. However, excessively long membranes can lead to a significant increase in pressure loss in the permeate flow channel, thereby reducing net driving pressure and severely reducing permeate efficiency.

[0004] Analysis revealed that, due to limited commercial installation space and the specifications of the 4040 membrane element, existing commercial membrane elements face a dilemma: 1) Simply increasing the length of the membrane sheet to improve the packing density of the membrane element can increase the water production, but it will severely reduce the water production efficiency; 2) Using a thicker water flow guide cloth and a larger diameter central tube to reduce the water production side pressure can improve the water production efficiency, but it will reduce the packing density of the membrane element, resulting in a decrease in water production.

[0005] Therefore, it is necessary to provide a commercial spiral wound membrane element structure and winding method to solve the dilemma of the above-mentioned commercial membrane elements. Summary of the Invention

[0006] The purpose of this invention is to provide a commercial spiral wound membrane element structure and winding method, the specific technical solution of which is as follows: In a first aspect, the present invention provides a commercial spiral wound membrane element structure, including a main product water component and multiple auxiliary product water components; The main water production component includes a main water production pipe, a main water production guide cloth, and a main folded diaphragm; the main water production pipe is arranged along one wide end of the main water production guide cloth; the main folded diaphragm is laid at a distance of at least one C1 from the main water production pipe along the length of the main water production guide cloth; C1 represents the circumference corresponding to the outer diameter of the main water production pipe; The number of main folded membrane sheets is the same as the number of secondary product water components. Each of the main folded membrane sheets is laid on the main product water guide cloth in a staggered manner and is arranged away from the main product water pipe in sequence. The main product water guide cloth is arranged between each pair of adjacent main folded membrane sheets. Each of the main folded diaphragms is provided with an auxiliary water production component between each of the main water production steps and the adjacent main water production flow steps; each of the auxiliary water production components is staggered and arranged away from the main water production pipe. Each of the by-product water components includes a by-product water pipe, a by-product water guide cloth, and a secondary folded diaphragm; the by-product water pipe is arranged along one wide end of the by-product water guide cloth; the secondary folded diaphragm is laid at a distance of at least one C2 from the by-product water pipe along the length direction of the by-product water guide cloth; C2 represents the circumference corresponding to the outer diameter of the by-product water pipe; The commercial spiral wound membrane element structure is formed by combining and winding the main water production component and each of the auxiliary water production components.

[0007] Optionally, the misalignment distance between any two adjacent main folded membranes is A, where A is the ratio of the circumference of the outer diameter of the main product water pipe to the total number of main folded membranes. Controlling the misalignment distance between the main folded membranes facilitates their uniform distribution along the outer circumference of the main product water pipe.

[0008] Optionally, the stagger distance between any two adjacent by-product water components is B, where B is the ratio of the circumference of the circumscribed circle formed by the outer walls of all the by-product water pipes to the total number of by-product water pipes. Controlling the stagger distance between the by-product water components facilitates the uniform distribution of each by-product water component along the outer circumference of the main product water pipe.

[0009] Optionally, the number of the by-product water components is an even number, and greater than or equal to four.

[0010] Optionally, the first main folded membrane includes a first concentrate separator and a first membrane; the first membrane is staggered and folded to form a first staggered folded membrane for accommodating the first concentrate separator; the length of the first concentrate separator is equal to the length of the short membrane of the first staggered folded membrane; the short membrane of the first staggered folded membrane is sequentially connected to its adjacent main product water guide cloth and the secondary product water assembly, while its long membrane is connected to its adjacent main product water guide cloth; A first sealing adhesive line is applied to each of the three open ends of the first misaligned folded diaphragm; each of the first sealing adhesive lines forms a U-shaped structure.

[0011] Optionally, the sub-folded membrane includes a second concentrate separator and a second membrane; the second membrane is staggered and folded to form a second staggered folded membrane for accommodating the second concentrate separator; the length of the second concentrate separator is equal to the length of the short membrane of the second staggered folded membrane; the short membrane of the second staggered folded membrane is connected to its adjacent byproduct water guide cloth, while its long membrane is connected to its adjacent main folded membrane; A second sealing adhesive line is applied to each of the three open ends of the second misaligned folded diaphragm; each of the second sealing adhesive lines forms a U-shaped structure.

[0012] In a second aspect, the present invention provides a method for manufacturing the aforementioned commercial spiral wound membrane element structure, comprising: Step S1: Obtain the main water production component and the auxiliary water production component respectively; The main water pipe is attached along one wide end of the main water guide cloth. Then, the main water guide cloth is rolled up at least once along the main water pipe. Next, the main folded membrane sheets are sequentially and staggeredly stacked on the main water guide cloth and sequentially disposed away from the main water pipe to obtain the main water component. The main water guide cloth is disposed between each pair of adjacent main folded membrane sheets. The byproduct water pipe is attached along one wide end of the first byproduct water guide cloth. Then, the byproduct water guide cloth is rolled up at least once along the byproduct water pipe. Then, the sub-folded diaphragm is laid on the byproduct water guide cloth to obtain the byproduct water assembly. Step S2: The auxiliary water production components are respectively installed between each of the main folded membrane sheets and the adjacent main water production guide cloth; each of the auxiliary water production components is staggered away from the main water production pipe in sequence; Step S3: Starting from the main product water pipe, the main folded membrane is wound along the length of the main product water guide cloth, and the secondary product water components that are staggered are wound in sequence until the commercial spiral wound membrane element structure is obtained.

[0013] The application of the technical solution of the present invention has at least the following beneficial effects: (1) The commercial spiral wound membrane element structure provided by the present invention can not only improve the filling density and water production of the membrane element, but also improve the water production efficiency of the membrane element, thus solving the dilemma of existing commercial membrane elements. Specifically, the present invention greatly reduces the distance from the end of the membrane to the water production pipe by introducing a structural layout combining the main water production pipe and multiple auxiliary water production pipes, thereby greatly reducing the pressure of the water production channel at the end of the membrane. This is equivalent to dividing the original single long channel into multiple parallel short channels, significantly reducing the pressure loss on the water production side, increasing the net driving pressure, and thus improving the water production efficiency of the membrane element. This avoids the traditional solution of using thicker water production guide cloth and larger diameter central pipe to reduce the water production side pressure and improve the water production efficiency (the traditional solution would reduce the filling density of the membrane element, resulting in a decrease in water production). Furthermore, by introducing a structural layout combining a main product water pipe and multiple auxiliary product water pipes, this invention can maintain high-efficiency water production, thereby allowing the use of low-thickness product water guiding fabric and concentrate separators of the same size as small-diameter commercial membrane elements. This increases the packing density of large-diameter commercial membrane elements (reaching 1848~1983m³). 2 / m 3 This increases water production.

[0014] (2) The staggered distance between each pair of adjacent main folded membranes and the staggered distance between each pair of adjacent secondary water production components adopted in this invention facilitates ensuring that there are enough membranes and guide cloths to fill between the main water production pipe and the secondary water production pipe, forming a continuous and uniform filtration and flow channel structure.

[0015] (3) The present invention uses four or more by-product water components. This is to ensure that multiple by-product water pipes can be evenly distributed around the main product water pipe, so that the cross-section of the membrane element after winding is close to a circle, ensuring structural stability and matching with standard pressure vessels.

[0016] (4) The method for manufacturing the commercial spiral wound membrane element structure used in this invention is feasible and can be industrialized.

[0017] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a commercial spiral wound membrane element structure in Example 1.

[0020] Figure 2 This is a schematic diagram of the main water production component and each auxiliary water production component in Example 1 before they are laid and wound (only four main water production guide cloths, four main folded membranes and four auxiliary water production components are shown in the figure).

[0021] Figure 3 This is a schematic diagram of the structure after the main folded membrane and the main product water guiding cloth are connected in Example 1 (the main product water guiding cloth below the bottom main folded membrane is not shown in the figure).

[0022] Explanation of reference numerals: 1. Main product water assembly; 1.1. Main product water pipe; 1.2. Main product water guide cloth; 1.3. Main folded diaphragm; 1.3.1. First concentrate separator; 3. Secondary product water assembly; 2.1. Secondary product water pipe; 2.2. Secondary product water guide cloth; 2.3. Secondary folded diaphragm. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: See Figures 1-3 A commercial spiral wound membrane element structure (specifically, an 8012 model membrane element with a diameter of 200 mm) includes a main product water module 1 and multiple auxiliary product water modules 2; The main water production assembly 1 includes a main water production pipe 1.1 (the size of the main water production pipe 1.1 is the same as that of the existing commercial 8012 model membrane element; specifically, the inner diameter of the main water production pipe 1.1 is 27mm and the outer diameter is 39mm), a main water production guide cloth 1.2 (thickness is 0.153mm), and a main folded membrane 1.3; the main water production pipe 1.1 is arranged along one wide end of the main water production guide cloth 1.2; the first main folded membrane is laid at least one C1 distance (specifically one C1 distance) from the main water production pipe 1.1 along the length of the main water production guide cloth 1.2; C1 represents the circumference corresponding to the outer diameter of the main water production pipe 1.1, so that the main water production guide cloth 1.2 can be wound around the main water production pipe 1.1 at least once, providing sufficient flow channel space for water production; The number of main folded membrane sheets 1.3 is the same as the number of auxiliary water production components 2. Each main folded membrane sheet 1.3 is laid on the main water production guide cloth 1.2 in a staggered manner and is arranged away from the main water production pipe 1.1. The main water production guide cloth 1.2 is arranged between each pair of adjacent main folded membrane sheets 2. The auxiliary water production components 2 are respectively arranged between each of the main folded diaphragms 1.3 and the adjacent main water production guide cloth 1.2; each of the auxiliary water production components 2 is staggered away from the main water production pipe 1.1. Each of the by-product water components 2 includes a by-product water pipe 2.1 (the inner diameter of the by-product water pipe 2.1 is 7 mm and the outer diameter is 11 mm), a by-product water guide cloth 2.2, and a secondary folded diaphragm 2.3; the by-product water pipe 2.1 is arranged along one wide end of the by-product water guide cloth 2.2; the secondary folded diaphragm 2.3 is laid at least one C2 distance from the by-product water pipe 2.1 along the length of the by-product water guide cloth 2.2; C2 represents the circumference corresponding to the outer diameter of the by-product water pipe 2.1, so that the by-product water guide cloth 2.2 can be wound around the by-product water pipe 2.1 at least once, providing sufficient flow channel space for water production; The commercial spiral wound membrane element structure is formed by combining and rolling the main water production component 1 and each of the auxiliary water production components 2.

[0025] The misalignment distance between any two adjacent main folded membranes 1.3 is A, where A is the ratio of the circumference of the outer diameter of the main water pipe 1.1 to the total number of main folded membranes 1.3. Controlling the misalignment distance between each main folded membrane 1.3 facilitates the uniform distribution of each main folded membrane 1.3 along the outer periphery of the main water pipe 1.1.

[0026] The misalignment distance between any two adjacent secondary water production components 2 is B, where B is the ratio of the circumference of the circumscribed circle formed by the outer walls of all the secondary water production pipes 2.1 to the total number of the secondary water production pipes 2.1. Controlling the misalignment distance between the secondary water production components 2 facilitates the uniform distribution of each secondary water production component 2 along the outer periphery of the main water production pipe 1.1.

[0027] The number of by-product water components 2 is an even number, greater than or equal to four, to ensure that multiple by-product water pipes 2.1 can be evenly distributed circumferentially along the main product water pipe 1.1, so that the cross-section of the membrane element after winding is close to a circle, ensuring structural stability and matching with a standard pressure vessel. In this embodiment 1, sixteen by-product water components 2 are specifically selected.

[0028] The main folded membrane 1.3 includes a first concentrate separator 1.3.1 (0.2 mm thick) and a first membrane (0.14 mm thick); the first membrane is folded in a staggered manner to form a first staggered folded membrane for accommodating the first concentrate separator 1.3.1; the length of the first concentrate separator 1.3.1 is equal to the length of the short membrane of the first staggered folded membrane; the short membrane of the first staggered folded membrane is sequentially connected to its adjacent main product water guide cloth 1.2 and the auxiliary product water assembly 2, while its long membrane is connected to its adjacent main product water guide cloth 1.2; First sealing lines (specifically polyurethane adhesive) are applied to the three open ends of the first misaligned folded diaphragm. Each of the first sealing lines forms a U-shaped structure, which facilitates sealing connection with the main water flow guide cloth 1.2 and the auxiliary water component 2 to form a membrane bag for collecting water.

[0029] The sub-folded membrane 2.3 includes a second concentrate separator (0.2 mm thick) and a second membrane (0.14 mm thick); the second membrane is staggered and folded to form a second staggered folded membrane for accommodating the second concentrate separator; the length of the second concentrate separator is equal to the length of the short membrane of the second staggered folded membrane; the short membrane of the second staggered folded membrane is connected to its adjacent byproduct water guide cloth 2.2, while its long membrane is connected to its adjacent main folded membrane 1.3; A third sealing line (specifically polyurethane adhesive) is applied to each of the three open ends of the second staggered folded diaphragm. Each of the second sealing lines forms a U-shaped structure, which facilitates sealing connection with the secondary water guide cloth 2.2 and the main folded diaphragm 1.3 to form a membrane bag for collecting water.

[0030] The misalignment distance between the short and long membranes of the first misaligned folded membrane is 5mm, which helps to increase the effective membrane area of ​​the first membrane. The misalignment distance between the short and long membranes of the second staggered folded membrane is 15mm, which facilitates increasing the effective membrane area of ​​the second membrane.

[0031] The method for fabricating the commercial spiral wound membrane element structure includes: Step S1: Obtain the main water production component 1 and the auxiliary water production component 2 respectively; The main water production pipe 1.1 is attached along one wide end of the main water production guide cloth 1.2. Then, the main water production guide cloth 1.2 is rolled up once along the main water production pipe 1.1. Then, each of the main folded membrane sheets 1.3 is sequentially and staggeredly stacked on the main water production guide cloth 1.2 and sequentially disposed away from the main water production pipe 1.1 to obtain the main water production assembly 1. The main water production guide cloth 1.2 is disposed between each pair of adjacent main folded membrane sheets 1.3. The byproduct water pipe 2.1 is attached along one wide end of the byproduct water guide cloth 2.2. Then, the byproduct water guide cloth 2.2 is rolled up once along the byproduct water pipe 2.1. Then, the sub-folded diaphragm 2.3 is laid on the byproduct water guide cloth 2.2 to obtain the byproduct water assembly 2. Step S2: The auxiliary water production component 2 is respectively installed between each of the main folded diaphragm 1.3 and its adjacent main water production guide cloth 1.2; each of the auxiliary water production components 2 is staggered away from the main water production pipe 1.1. Step S3: Starting from the main product water pipe 1.1, the main folded membrane 1.3 is wound along the length of the main product water guide cloth 1.2, and the secondary product water components 2 that are staggered are wound in sequence until the commercial spiral wound membrane element structure is obtained.

[0032] The parameter setting principle and specific setting values ​​for Example 1 are as follows: The parameters in this embodiment are determined according to the following principles: Let the diameter of the membrane element be... D The outer radius of the main water production pipe is 1.1. R The outer radius of the by-product water pipe 2.1 is rThe number of by-product water pipes 2.1 is n (n is an even number and n≥4). The above parameters satisfy the following relationship: 1.5π R 2 ≥ nπ r 2 ≥ π R 2 The distance between the center of the main water production pipe 1.1 and the center of the auxiliary water production pipe 2.1 is ,in P This refers to the ratio of the membrane area between the secondary water pipe and the main water pipe to the total membrane area, with a value ranging from 0.4 to 0.5.

[0033] In this embodiment, D =200mm, R =19.5mm, r =5.5mm, n=16, P =0.5. The calculated distance between the center of the main water production pipe 1.1 and the center of the auxiliary water production pipe 2.1 is 72mm.

[0034] The length X of the subfolded diaphragm 2.3 is obtained by solving the following cross-sectional area equation: Membrane element roll cross-sectional area = Membrane element product cross-sectional area - Main product water pipe cross-sectional area - Annular cross-sectional area at the auxiliary product water pipe The cross-sectional area of ​​the membrane element roll is calculated from the thickness and length of components such as the main folded membrane 1.3, the sub-folded membrane 2.3, the main product water guiding cloth 1.2, the secondary product water guiding cloth 2.2, and the concentrate separator. In this embodiment, X is calculated to be 1250 mm (before folding). The length of the main folded membrane 1.3 is (1 + P ) / (1- P )×X=3750mm (before folding).

[0035] Based on the above parameters, the misalignment distance between adjacent main folded diaphragms 1.3 is A = C1 / M ≈ 7.66 mm, and the misalignment distance between adjacent secondary water production components 2 is B = L / N ≈ 30.5 mm, where C1 is the circumference corresponding to the outer diameter of the main water production pipe 1.1, M is the total number of main folded diaphragms 1.3 (i.e., 16), L is the circumference of the circumscribed circle formed by the outer walls of all secondary water production pipes 2.1, and N is the total number of secondary water production components 2 (i.e., 16).

[0036] Comparative Example 1: Commercially available 8012 model membrane elements were purchased. The product water pipe size used in this commercially available 8012 model membrane element is the same as the main product water pipe 1.1 used in Example 1, the thickness of the product water guiding cloth is the same as the thickness of the first main product water guiding cloth used in Example 1, the thickness of the concentrate separator is the same as the thickness of the first concentrate separator 1.3.1 used in Example 1, and the thickness of the membrane sheet is the same as the thickness of the first membrane sheet used in Example 1.

[0037] Comparative Example 2: Purchase the raw materials of existing commercial 4040 model membrane elements (the size of the permeate pipe is the same as that of the main permeate pipe 1.1 used in Example 1, the thickness of the permeate guide cloth is 0.25mm, the thickness of the concentrate separator is 0.69mm, and the thickness of the membrane sheet is the same as that of the first membrane sheet used in Example 1), and roll them up according to the existing commercial 8012 model membrane element rolling method to obtain the 8012 model membrane element.

[0038] The 8012 model membrane elements obtained in Example 1 and Comparative Examples 1-2 were tested for water production efficiency, water production rate, desalination rate, effective membrane area and packing density, respectively. The test results are shown in Table 1.

[0039] The permeate efficiency is calculated using the following formula: Permeate efficiency = Permeate flow rate ÷ Effective membrane area. The permeate flow rate is the flow rate of a 1500 ppm sodium chloride aqueous solution in raw water at an operating pressure of 150 psi.

[0040] The desalination rate was tested as follows: The test conditions were a raw water sodium chloride aqueous solution with a concentration of 1500 ppm, an operating pressure of 150 psi, and a permeate recovery rate of 50% of the raw water. The permeate concentration was measured and recorded. Desalination rate = 1 - permeate concentration ÷ feed water concentration. The feed water concentration is the same as the raw water concentration.

[0041] The effective membrane area is tested as follows: After disassembling the membrane element, measure the membrane area of ​​each membrane sheet located within the polyurethane adhesive line, and then sum them up to obtain the effective membrane area.

[0042] The packing density is calculated using the following formula: Packing density = Effective membrane area ÷ Volume of membrane element.

[0043] Table 1 Test Results

[0044] From the data in Table 1, we know that: Compared to the small-diameter commercial membrane elements produced by the traditional small-diameter commercial membrane winding method used in Comparative Example 1, the winding method used in Example 1 greatly improves the water production efficiency per unit membrane sheet of the wound membrane element.

[0045] Compared to Comparative Example 2, which uses the raw materials of existing commercial 4040 model membrane elements and rolls small-diameter commercial membrane elements using traditional small-diameter commercial membrane rolling methods, the rolling method used in Example 1 greatly improves the filling density and water production of the rolled membrane elements.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent structural transformations made under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the protection scope of the present invention.

Claims

1. A commercial spiral wound membrane element structure, characterized in that, It includes a main water production unit (1) and multiple auxiliary water production units (2); The main water production component (1) includes a main water production pipe (1.1), a main water production guide cloth (1.2), and a main folded diaphragm (1.3); the main water production pipe (1.1) is arranged along one wide end of the main water production guide cloth (1.2); the main folded diaphragm (1.3) is laid at a distance of at least one C1 from the main water production pipe (1.1) along the length of the main water production guide cloth (1.2); C1 represents the circumference corresponding to the outer diameter of the main water production pipe (1.1); The number of the main folded membranes (1.3) is the same as the number of the secondary product water components (2). Each of the main folded membranes (1.3) is laid on the main product water guide cloth (1.2) in a staggered manner and is arranged away from the main product water pipe (1.1). The main product water guide cloth (1.2) is arranged between each pair of adjacent main folded membranes (2). Each of the main folded diaphragms (1.3) and its adjacent main product water guide cloth (1.2) is respectively provided with the auxiliary product water assembly (2); each of the auxiliary product water assemblies (2) is staggered away from the main product water pipe (1.1); Each of the by-product water components (2) includes a by-product water pipe (2.1), a by-product water guide cloth (2.2), and a sub-folded diaphragm (2.3); the by-product water pipe (2.1) is arranged along one wide end of the by-product water guide cloth (2.2); the sub-folded diaphragm (2.3) is laid at least one C2 distance from the by-product water pipe (2.1) in the length direction of the by-product water guide cloth (2.2); C2 represents the circumference corresponding to the outer diameter of the by-product water pipe (2.1); The commercial spiral wound membrane element structure is formed by combining and rolling the main water production component (1) and each of the auxiliary water production components (2).

2. The commercial spiral wound membrane element structure as described in claim 1, characterized in that, The misalignment distance between any two adjacent main folded membranes (1.3) is A, where A is the ratio of the circumference of the outer diameter of the main water pipe (1.1) to the total number of the main folded membranes (1.3).

3. The commercial spiral wound membrane element structure as described in claim 1, characterized in that, The misalignment distance between any two adjacent byproduct water components (2) is B, where B is the ratio of the circumference of the circumscribed circle formed by the outer walls of all byproduct water pipes (2.1) to the total number of byproduct water pipes (2.1).

4. The commercial spiral wound membrane element structure as described in claim 1, characterized in that, The number of the by-product water components (2) is an even number and greater than or equal to four.

5. The commercial spiral wound membrane element structure as described in any one of claims 1 to 4, characterized in that, The main folded membrane (1.3) includes a first concentrate separator and a first membrane; the first membrane is folded in a staggered manner to form a first staggered folded membrane for accommodating the first concentrate separator; the length of the first concentrate separator is equal to the length of the short membrane of the first staggered folded membrane; the short membrane of the first staggered folded membrane is connected in sequence to the adjacent main product water guide cloth (1.2) and the secondary product water assembly (2), while its long membrane is connected to the adjacent main product water guide cloth (1.2).

6. The commercial spiral wound membrane element structure as described in claim 5, characterized in that, A first sealing adhesive line is applied to each of the three open ends of the first misaligned folded diaphragm; each of the first sealing adhesive lines forms a U-shaped structure.

7. The commercial spiral wound membrane element structure as described in claim 6, characterized in that, The sub-folded membrane (2.3) includes a second concentrate separator and a second membrane; the second membrane is folded in a staggered manner to form a second staggered folded membrane for accommodating the second concentrate separator; the length of the second concentrate separator is equal to the length of the short membrane of the second staggered folded membrane; the short membrane of the second staggered folded membrane is connected to its adjacent byproduct water guide cloth (2.2), while its long membrane is connected to its adjacent main folded membrane (1.3).

8. The commercial spiral wound membrane element structure as described in claim 7, characterized in that, A second sealing adhesive line is applied to each of the three open ends of the second misaligned folded diaphragm; each of the second sealing adhesive lines forms a U-shaped structure.

9. The commercial spiral wound membrane element structure as described in claim 7, characterized in that, The sealant used for each of the first and second sealing lines is polyurethane adhesive.

10. A method for fabricating a commercial spiral wound membrane element structure as described in claim 9, characterized in that, include: Step S1: Obtain the main water production component (1) and the auxiliary water production component (2) respectively. The main water pipe (1.1) is attached along one wide end of the main water flow guide cloth (1.2). Then, the main water flow guide cloth (1.2) is wound around the main water pipe (1.1) at least once. Then, each of the main folded membrane sheets (1.3) is laid on the main water flow guide cloth (1.2) in a staggered manner and is arranged away from the main water pipe (1.1) to obtain the main water component (1). The main water flow guide cloth (1.2) is provided between each pair of adjacent main folded membrane sheets (1.3). The byproduct water pipe (2.1) is attached along one wide end of the byproduct water guide cloth (2.2). Then, the byproduct water guide cloth (2.2) is wound around the byproduct water pipe (2.1) at least once. Then, the sub-folded diaphragm (2.3) is laid on the byproduct water guide cloth (2.2) to obtain the byproduct water assembly (2). Step S2: The auxiliary water production components (2) are respectively installed between each of the main folded membranes (1.3) and the adjacent main water production guide cloth (1.2); each of the auxiliary water production components (2) is staggered away from the main water production pipe (1.1); Step S3: Starting from the main product water pipe (1.1), the main folded membrane (1.3) is wound along the length of the main product water guide cloth (1.2), and the secondary product water components (2) that are staggered are wound in sequence until the commercial spiral wound membrane element structure is obtained.

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