TWM582043U - Flow-guide net, film element and filter element - Google Patents

Abstract

A diversion net and a membrane element and a filter element using the diversion net. The structural design of the diversion net changes the inflow direction of raw water, so that the direction of raw water flow changes from axial flow to radial flow, so as to lengthen the length of the filtering flow channel.

Description

Drainage net, membrane element and filter element

This creation relates to the field of water treatment technology, and in particular, to a diversion net and a membrane element and a filter element using the diversion net.

With the improvement of people's awareness of healthy drinking water, people's requirements for drinking water quality have continuously improved, and various water purification equipment has entered the market and entered millions of households. Now more and more families are beginning to use domestic pure water machines using reverse osmosis membrane (RO) or nanofiltration membrane (NF).

Both RO membrane water purifier and NF membrane water purifier use cross flow filtration technology. Please refer to Fig. 1. Fig. 1 shows the principle of cross-flow filtration. The arrow in Fig. 1 represents the flow direction of the liquid. As shown in Figure 1, in the cross-flow filtration technology, under the impetus of the pump, the raw liquid on the left in Figure 1 flows parallel to the membrane surface 100 to the right in Figure 1, and flows downward through the flow during the flow. The membrane surface 100 is filtered. Therefore, when the original liquid flows parallel to the membrane surface 100, a shearing force is generated and the particles 200 retained on the membrane surface are taken away, so that the pollution layer deposited on the surface of the membrane surface 100 is maintained at a relatively thin level. .

Therefore, in the cross-flow filtration technology shown in FIG. 1, a large amount of concentrated water to be discharged is generated (that is, the right side in FIG. 1). With the rising awareness of environmental protection and the need for a friendly environment, reducing the discharge of concentrated water is the bottleneck that RO membrane pure water machines and NF membrane pure water machines need to be promoted and used.

Please refer to Figure 2A for the structure of a conventional RO membrane and / or NF membrane filter element. intention. As shown in FIG. 2A, the conventional RO membrane and / or NF membrane filter element has a cylindrical shape, and is composed of a central tube 300 and a membrane element 400 rolled around the central tube 300. In order to make the raw water flow and complete the filtration, the membrane element 400 is usually provided with at least one layer of diversion net. Please refer to FIG. 2B, which is an expanded view of a conventional RO membrane and / or NF membrane filter module, and only the diversion net 410 is shown therein. Those skilled in the art may know from the common knowledge in the art that the membrane element 400 further includes a filter membrane and a water outlet guide layer laminated with the guide net 410. These film layers are disposed below the diversion net 410 in FIG. 2B, and thus cannot be reflected in FIG. 2B.

In a membrane element of a conventional RO membrane and / or NF membrane filter element, as shown by an arrow in FIG. 2B, raw water flows in from the water inlet side of the diversion net 410, and concentrated water flows from the diversion net. The outlet side of 410 flows out. During the filtering process, water flows in the axial direction of the central pipe 300.

Therefore, in the conventional RO membrane and / or NF membrane filter module, there are structural characteristics of a wide water inlet flow path and a short filtration process, which makes the overall filtration flow rate slow. At the same time, in this kind of filter element, the surface of the membrane is prone to the phenomenon of concentration polarization, which causes fouling and clogging, which reduces the desalination rate of the membrane element and the production of pure water, which seriously affects the service life of the membrane element.

The purpose of this creation is to solve the above problems and provide a diversion net, and a membrane element and a filter element using the diversion net. Through the structural design of the diversion net, the direction of the raw water flow in the membrane element is changed, so that the raw water flow direction changes from an axial flow to a radial flow, thereby lengthening the length of the filtering flow channel. Therefore, by using the filter element of the diversion net, especially the cross-flow filter element, the pollutants on the surface of the separation membrane can be washed away and the pollutants can be precipitated and scaled, so as to reduce the problem of the scaling speed on the water outlet side of the membrane element To improve the scaling problem The service life of high membrane elements and even filter elements.

According to an aspect of the present invention, a diversion net is provided, which has a water inlet side and a water outlet side opposite to each other, wherein a first water barrier material is provided on the water inlet side of the diversion net to seal Part of the water inlet side and an effective water inlet width are defined on the water inlet side; a second water barrier material is provided on the water outlet side of the diversion net to seal part of the water outlet side and An effective outlet width is defined on the outlet side; and the diversion net has a comb-like structure including at least one comb tooth within the effective outlet width range of the outlet side.

In an embodiment, the first water-repellent material provided on the water-intake side forms at least one opening to form a plurality of water-intakes on a portion of the water-intake side sealed by the first water-repellent material. Water channel.

In one embodiment, the comb teeth are disposed at equidistant or non-equidistant positions.

In one embodiment, the openings are arranged at equal or unequal intervals.

In an embodiment, the effective water inlet width is 110% to 140% of a vertical distance between the water inlet side and the water outlet side.

In an embodiment, the effective water outlet width is 60% to 90% of the vertical distance between the water inlet side and the water outlet side.

In an embodiment, the projection of the effective water inlet width on the water inlet side on the water outlet side does not fall within the range of the effective water outlet width.

In one embodiment, the width of the comb teeth is W1, and the length of the comb teeth is L1. The range of W1 is 18-22 mm, and the range of L1 is 80-100 mm.

In one embodiment, the interval between the comb teeth is in the range of 8-12 mm.

In an embodiment, the width of the openings is 3 to 8 mm, and the interval between the openings is The distance is 60 ~ 80mm.

In one embodiment, the water blocking material is polyurethane glue.

According to another aspect of the present invention, a membrane element is provided, which includes a layer of a water production diversion net, at least one separation membrane, and a layer of any one of the above diversion nets.

In an embodiment, the diversion net is in contact with the water inlet surface of the separation membrane; the water production diversion net is in contact with the water outlet surface of the separation membrane.

In one embodiment, the separation membrane is arranged in half, and the water production diversion net is clamped in the separation membrane arranged in half.

In one embodiment, the separation membrane is a reverse osmosis membrane or a nanofiltration membrane.

In one embodiment, the water-producing diversion net, the at least one separation membrane, and the diversion net are bonded to each other by an adhesive. The adhesive is a conventional reagent applied to a membrane element in the art.

In a preferred embodiment, the water generating diversion net, the at least one separation membrane and the side of the diversion net are aligned, and the water generating diversion net and the separation are separated by applying an adhesive on the side. The film and the guide net are bonded to each other.

In an embodiment, the water inlet side of the diversion net is not bonded to the separation membrane and the water production diversion net at the effective water inlet width; the water outlet side of the diversion net is at The effective water outlet width is not adhered to the separation membrane and the water production diversion net.

In a preferred embodiment, the separation membrane is arranged in half, and the water production diversion net is sandwiched in the separation membrane arranged in half, so that the structure of the membrane element is a separation membrane layered in sequence, and the product A water diversion net, a separation membrane, and the diversion net, and the sides of the separation membrane, the water production diversion net, the separation membrane, and the diversion net that are sequentially stacked are aligned and pass through the sides An adhesive is applied to adhere the sequentially laminated separation membrane, the water production diversion net, the separation membrane, and the diversion net to each other; wherein the water inlet side of the diversion net is at the effective water inlet width It is not bonded to the separation membrane and the water production diversion net; the water outlet side of the drainage net is not bonded to the separation membrane and the water production diversion net at the effective water outlet width.

According to another aspect of the present invention, there is also provided a filter element including at least one layer of any one of the above-mentioned diversion nets or at least one layer of any one of the above-mentioned membrane elements.

In one embodiment, the filter element is a cross-flow filter element.

In a preferred embodiment, a filter element is provided, including a central water collecting pipe and a membrane element surrounding the central water collecting pipe. The membrane element includes a layer of a water intake diversion net, at least one layer of separation membrane, and a layer of product. Water diversion network;

The water inlet diversion net has an opposite water inlet side and a water outlet side, and a first water blocking material is provided on the water inlet side of the water diversion net to seal a part of the water inlet side and the An effective water inlet width is defined on the water inlet side; a second water blocking material is provided on the water outlet side of the diversion net to seal a part of the water outlet side and define an effective water inlet side Outlet width; the diversion net has a comb-like structure including at least one comb tooth within the effective outflow width range of the outflow side; and the effective inflow width of the inflow side is in the The projection on the water outlet side does not fall within the range of the effective water outlet width.

In the above preferred embodiment, the effective water inlet width is 110% to 140% of the vertical distance between the water inlet side and the water outlet side; and the effective water outlet width is between the water inlet side and the water outlet side. 60% to 90% of the vertical distance between the water outlet sides.

In the diversion net of this creation:

Firstly, the filter assembly is changed by the setting of the first and second water-proof materials. The width of the inlet water and the outlet water; at the same time, by setting the effective water inlet width and the effective water outlet width, the flow direction of the raw water is changed from the traditional axial direction of the central tube to the radial direction of the central tube. The length of the filtering process of raw water is increased. In this way, when the water flow rate is constant, the velocity of raw water flowing through the membrane element is effectively increased, and the difference in fluid velocity between the water inlet end and the water outlet end of the membrane element is effectively reduced, thereby improving the concentration polarization phenomenon.

Secondly, due to the increase in the length of the filtration process of raw water and the increase of the fluid flow rate, the pollutants on the surface of the membrane element can be washed more effectively, thereby reducing the precipitation and fouling of the pollutants on the surface of the membrane element, thereby extending the use of the membrane element life.

Furthermore, through the comb-like structure in the effective water outlet width range on the water outlet side of the diversion net, the space for filtering flow channels of raw water is further increased, thereby further slowing down the precipitation and scaling of pollutants on the surface of the membrane element. In addition, by forming a plurality of openings in the first water-blocking material on the water inlet side to increase the effective water inflow of raw water, the dead zone of the membrane element can be eliminated and the end flow velocity can be increased, and the effect of flushing and diluting pollutants can be generated at the same time. This further slows down the precipitation and fouling of contaminants on the surface of the membrane element.

Therefore, in this creation, the structural design of the diversion net is used to change the flow direction of raw water in the membrane element, so that the flow direction of the raw water is changed from axial flow to radial flow, thereby lengthening the length of the filtering flow channel. Therefore, by using the filter element of the diversion net, especially the cross-flow filter element, the pollutants on the surface of the separation membrane can be washed away and the pollutants can be precipitated and scaled, so as to reduce the problem of the scaling speed on the water outlet side of the membrane element. , To improve the problem of scaling, thereby greatly increasing the service life of membrane elements and even filter elements.

100‧‧‧ film surface

200‧‧‧ particles

300‧‧‧ Central tube

410,1,1’‧‧‧‧Diversion net

400, 2, 2 ’‧‧‧ membrane element

11‧‧‧Inlet side

12‧‧‧ Outlet side

111‧‧‧The first waterproof material

121‧‧‧Second waterproof material

112‧‧‧ opening

122‧‧‧comb teeth

EW1‧‧‧Effective water inlet width

EW2‧‧‧ Effective Outlet Width

21‧‧‧ water production diversion net

22‧‧‧ separation membrane

221‧‧‧ water surface

222‧‧‧ Out of the water

3‧‧‧Filter element

31‧‧‧Central Collection Pipe

D‧‧‧distance

Figure 1: Schematic diagram of cross-flow filtration; Figure 2A: Schematic diagram of a conventional RO membrane and / or NF membrane filter element; Figure 2B: Figure 2A of a conventional RO membrane and / or NF membrane filter element Schematic diagram of the expanded state of the membrane element; Figure 3: Schematic diagram of a diversion net according to an embodiment of the present invention; Figure 4: A partially enlarged view of Figure 3; Figures 5A to 5C: Different embodiments Schematic diagram of comb teeth described in Figures 6A to 6C: Schematic diagrams of membrane elements according to different embodiments of the present invention; FIG. 7: Schematic diagrams of filter elements according to an embodiment of the present invention, in which the filtering The membrane element of the element is in an unfolded state; FIGS. 8A to 8C: Experimental verification data of a filter element according to an embodiment of the present invention.

The technical solution in this creative embodiment will be clearly and completely described below with reference to the drawings in this creative embodiment. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present invention.

The terms "first", "second", "third", etc. (if present) in the description and claims of the present creation and the above-mentioned drawings are used to distinguish similar objects, and not necessarily to describe a specific order Or in order. It should be understood that items described as such are interchangeable under appropriate circumstances. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusion.

In this patent document, the drawings discussed below and the embodiments used to describe the principles of this creative disclosure are for illustration only and should not be construed as limiting the scope of this creative disclosure. Those skilled in the art will understand that the principles of the present invention can be implemented in any suitably arranged system. Exemplary embodiments will be explained in detail, and examples of the embodiments are shown in the drawings. In addition, a terminal according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. The same reference numbers in the drawings refer to the same elements.

The terms used in this creative description are used to describe specific implementations only, and are not intended to show the concept of this creative. Unless the context clearly indicates a different meaning, expressions used in the singular encompass the expression in the plural. In this authoring statement, it should be understood that terms such as "including", "having" and "containing" are intended to indicate the possibility of a feature, number, step, action, or combination thereof disclosed in the authoring statement, and are not intended Excludes the possibility that one or more other features, digits, steps, actions, or a combination thereof may be present or may be added. The same reference numerals in the drawings refer to the same parts.

This embodiment provides a diversion network. The detailed description is described below with reference to FIGS. 3 and 4.

Referring to FIG. 3, FIG. 3 is a schematic structural diagram of a diversion net 1 according to an embodiment of the present invention. As shown in FIG. 3, the diversion net 1 has a water inlet side 11 and a water outlet side 12 opposite to each other.

As shown in FIG. 3, a first water blocking material 111 is provided on the water inlet side 11 of the diversion net 1 to seal a part of the water inlet side 11 and define a water inlet side Effective water inlet width EW1. A second water blocking material 121 is provided on the water outlet side 12 of the diversion net 1 to seal a part of the water outlet side 12 and define an effective water outlet width EW2 on the water outlet side 12.

Please continue to refer to FIG. 3, the diversion net 1 has a comb-like structure including at least one comb tooth 122 within the effective water outlet width EW2 of the water outlet side 12. At least one opening 112 is formed in the first water-impermeable material 111 provided on the water-intake side 11 to form a plurality of water-intake-side 11 in a portion sealed by the first water-impermeable material 111. Water inlet channel.

As shown in FIG. 3, the projection of the effective water inlet width EW1 on the water inlet side 11 on the water outlet side 12 does not fall within the range of the effective water outlet width EW2. Those skilled in the art can understand that the positional relationship between the effective water inlet width EW1 and the effective water outlet width EW2 may not be limited to the example shown in FIG. 3, and may also have other positional relationships, and only needs to satisfy all The projection of the effective water inlet width EW1 on the water outlet side 12 may not fall within the range of the effective water outlet width EW2.

Please continue to refer to FIG. 3, the effective water inlet width EW1 is 110% to 140% of the vertical distance D between the water inlet side 11 and the water outlet side 12. The effective water outlet width EW2 is 60% to 90% of the vertical distance D between the water inlet side 11 and the water outlet side 12.

In this embodiment, the water blocking material is a polyurethane glue, which is a commercially available product.

Hereinafter, the comb-shaped structure including at least one comb tooth 122 and the opening 112 on the first water-barrier material 111 will be described in detail with reference to FIG. 4.

As shown in FIG. 4, it is defined that the width of the comb teeth 122 is W1, the length of the comb teeth is L1, and the distance between the comb teeth 122 and adjacent comb teeth is S1. The width W1 of the comb teeth 122 ranges from 18 to 22 mm, the length L1 of the comb teeth 122 ranges from 80 to 100 mm, and the interval S1 between the comb teeth 122 ranges from 8 to 12 mm. As shown in FIG. 3, it is defined that the width of the opening 112 is W2, and the distance between the opening 112 and an adjacent opening is S2. The width of the opening 112 The range of the degree W2 is 3 to 8 mm, and the range S2 between the openings 112 is 60 to 80 mm.

Those skilled in the art may know that the comb teeth 122 may be equidistantly disposed as shown in FIG. 3 and FIG. 4, or may be disposed not equidistantly; the opening 112 may be as illustrated in FIG. 3 and FIG. The equidistant setting shown in FIG. 4 may also be the non-equidistant setting. In addition, those skilled in the art may know that the rack 121 may have other shapes, and is not limited to the structure shown in FIG. 3 or FIG. 4. For example, the rack 121 may have a structure as shown in FIGS. 5A to 5C.

Further, the present invention also provides a membrane element 2. As shown in FIG. 6A, the membrane element 2 includes a layer of a water production diversion net 21, at least one separation membrane 22, and a layer of the diversion net 1. The diversion net 1 is in contact with the water inlet surface 221 of the separation membrane 22, and the water production diversion net 21 is in contact with the water outlet surface 222 of the separation membrane 22.

In the present creation, the separation membrane 22 may be a reverse osmosis membrane or a nanofiltration membrane.

For the purpose of clarity, the specific structure of the adhesive is not shown in FIG. 6A. Those skilled in the art can understand that the water production diversion net 21, the separation membrane 22, and the diversion net 1 pass between The adhesives adhere to each other. Such adhesives are products known in the art. For example, as shown in FIG. 6A, the water production diversion net 21, the separation membrane 22, and the diversion net 1 are aligned around the sides, and the water production diversion net 21 and the separation membrane are aligned. 22 and at least three sides of the diversion net 1 are coated with an adhesive, so that the water production diversion net 21, the separation membrane 22, and the diversion net 1 are shown in, for example, but not limited to, FIG. 6A. The upper edge, the right edge and the lower edge are bonded, and the water inlet side of the diversion net 1 is not at the effective water inlet width EW1 from the separation membrane 22 and the water production diversion net 21 Adhesion; the water outlet side of the diversion net 1 is not adhered to the separation membrane 22 and the water production diversion net 21 at the effective water outlet width EW2. That is, in one embodiment, Except for the effective water inlet width EW1 and the effective water outlet width EW2, the diversion net 1 is bonded to the other sides of the separation membrane 22 and the water production diversion net 21.

Further, in another embodiment of the present invention, the membrane element 2 in Fig. 6A may also have a structure as shown in Fig. 6B. The difference from the structure of FIG. 6A is that the separation membrane 22 is arranged in a folded state. Therefore, in this embodiment, as shown in FIG. 6B, the water production diversion net 21 is sandwiched between the folded surfaces of the separation membrane 22. That is, in the membrane element 2 shown in FIG. 6B, since the separation membrane 22 is disposed in a folded state, both sides of the water production diversion net 21 are in contact with the separation membrane 22 The water outlet surface 222 is in contact.

Further, in another embodiment of the present invention, the membrane elements 2 in FIG. 6A may be stacked to be used as a part of a filter element. Please refer to FIG. 6C for the laminated structure of the membrane element 2. As shown in FIG. 6C, the membrane element 2 'has the same structure as the membrane element 2, and the membrane element 2' and the membrane element 2 are stacked. In this way, since the separation membrane 22 of the membrane element 2 of the first layer is folded, and the water production diversion net 21 is sandwiched between the separation membranes 22, the The water inlet surface 221 of the separation membrane 22 of the membrane element 2 is in contact with the flow guide net 1 ′ of the membrane element 2 ′ of the second layer. Of course, in the case of three or more layers, the analogy is the same, that is, the water inlet surface of the separation membrane of the previous layer membrane element is in contact with the drainage network of the next layer membrane element, so that the water inlet surface of each layer of separation membrane can pass the corresponding diversion flow. The net is flooded.

Further, the present invention also provides a filter element 3, as shown in FIG. 7, the filter element 3 includes a central water collecting pipe 31 and at least one layer surrounding the central water collecting pipe 31 as shown in FIG. 6A or 6B.示 膜 膜 2。 The membrane element 2. Of course, when the filter element 3 includes a multilayer membrane element, the laminated structure of the membrane element is as shown in FIG. 6C. In the expanded view of FIG. 7, since Since the membrane element 2 has a laminated structure, only the diversion net 1 can be shown in FIG. 7. And for the purpose of clarity, the detailed structure of the central header 31 is not shown in FIG. 7. Those skilled in the art may know that the central water collecting pipe 31 is a conventional component in the art and has any structure known in the art. In the filter unit 3 shown in Fig. 7, the direction of the arrow represents the direction of the water flow.

As shown in FIG. 7, when a water flow flows into the diversion net 1 through the water inlet side 11 of the diversion net 1 and enters the filter assembly 3, since a water flow is provided on the water inlet side 11 The first water blocking material 111 allows raw water to enter only through the effective water inlet width EW1. In addition, since the second water-retaining material 121 corresponding to the effective water inlet width EW1 on the water outlet side 12 makes water flow only along the width direction of the diversion net 1 (that is, the same as the (A direction perpendicular to the vertical distance D between the water inlet side 11 and the water outlet side 12). It then flows out through the effective outlet width EW2 of the outlet side 12. Different from the direction of water flow in the conventional RO membrane and / or NF membrane filter module in Fig. 2B, the flow direction of the raw water in the diversion net 1 described in this creation is changed from the traditional axial direction along the central tube to the The radial direction of the central tube effectively increases the length of the filtering process of the raw water. At the same time, through the comb-like structure in the range of the effective water outlet width EW2 of the water outlet side 12 of the diversion net 1, the filtering flow channel space of the raw water is further increased (so that the raw water contacts the underside of the diversion net 1 more Separation membrane), thereby further slowing down the precipitation and fouling of contaminants on the surface of the membrane element. In addition, by forming a plurality of openings 112 in the first water blocking material 111 on the water inlet side 11 of the diversion net 1 to increase the effective water inflow of raw water, the dead zone of the membrane element can be eliminated and increased. The flow velocity at the end, at the same time, has the effect of flushing and diluting the pollutants, thereby further slowing the precipitation and scaling of the pollutants on the surface of the membrane element.

The applicant further experimentally verified the filtering effect of the conventional RO membrane filter module shown in FIG. 2A and the filter element 3 described in this creation. The experimental verification will be shown in Figure 2A The traditional RO membrane filter module and the filter module 3 described in this creation are installed in a reverse osmosis water purifier, and the test methods specified in GB 34914-2017 "Restricted Water Purifier Water Efficiency Limits and Water Efficiency Grades" are respectively The flow rate-life, flow rate loss, and salt rejection rate of the conventional RO membrane filter module shown in FIG. 2A and the filter module 3 described in this creation were tested, and the test results shown in FIGS. 8A to 8C were obtained.

As shown in FIG. 8A to FIG. 8C, the filter assembly 3 described in the present invention can significantly reduce the flow loss (about 30%) in the filtration process, and significantly improve the salt rejection rate.

In this creation, the structural design of the diversion net is used to change the direction of raw water flow in the membrane element, so that the direction of raw water flow changes from axial flow to radial flow, thereby lengthening the length of the filtering flow channel. Therefore, by using the filter element of the diversion net, especially the cross-flow filter element, the pollutants on the surface of the separation membrane can be washed away and the pollutants can be precipitated and scaled, so as to reduce the problem of the scaling speed on the water outlet side of the membrane element , To improve the problem of scaling, thereby greatly increasing the service life of membrane elements and even filter elements.

Claims (17)

A diversion net has a water inlet side and a water outlet side opposite to each other, wherein a first water blocking material is provided on the water inlet side of the diversion net to seal a part of the water inlet side and An effective water inlet width is defined on the water inlet side; a second water blocking material is provided on the water outlet side of the diversion net to seal a part of the water outlet side and define an effective water inlet side Water outlet width; and, the diversion net has a comb-like structure including at least one comb tooth within the effective water outlet width range of the water outlet side, wherein the effective water outlet width is between the water inlet side and the water outlet side. 60% to 90% of the vertical distance between the water inlet sides, the effective water inlet width is 110% to 140% of the vertical distance between the water inlet side and the water outlet side, and The projection of the effective water inlet width on the water outlet side does not fall within the range of the effective water outlet width. The diversion net according to item 1 of the scope of patent application, wherein the first water barrier material provided on the water inlet side forms at least one opening so as to seal a portion sealed by the first water barrier material. A plurality of water inlet channels are formed on the water inlet side. The diversion net according to item 1 of the scope of the patent application, wherein the comb teeth are arranged at equal or unequal intervals. The diversion net according to item 2 of the scope of the patent application, wherein the openings are arranged at equal or unequal intervals. The diversion net according to item 1 of the scope of patent application, wherein the width of the comb teeth is W1 and the length of the comb teeth is L1, wherein the range of W1 is 18 to 22 mm and the range of L1 is 80 to 100mm. The diversion net according to item 5 of the scope of patent application, wherein the interval between the comb teeth is in the range of 8 to 12 mm. The diversion net according to item 2 of the scope of patent application, wherein the width of the openings is 3 to 8 mm, and the interval between the openings is 60 to 80 mm. The diversion net as described in any one of claims 1 to 4, wherein the water blocking material is polyurethane glue. A membrane element includes a layer of a water production diversion net, at least one layer of separation membrane, and a layer of the diversion net described in item 1 of the scope of patent application. The membrane element according to item 9 of the scope of the patent application, wherein the diversion net is in contact with the water inlet surface of the separation membrane; and the water production diversion net is in contact with the water outlet surface of the separation membrane. The membrane element according to item 10 of the scope of patent application, wherein the separation membrane is arranged in half, and the water production diversion net is sandwiched in the separation membrane arranged in half. The membrane element according to item 11 of the scope of application for a patent, wherein the separation membrane is a reverse osmosis membrane or a nanofiltration membrane. The membrane element according to item 11 of the scope of the patent application, wherein the water producing diversion net, the separation membrane and the diversion net are aligned at the sides, and the water producing diversion net is coated with an adhesive on the sides. The flow net, the separation membrane, and the diversion net are bonded to each other; wherein the water inlet side of the flow diversion net is not at the effective water inlet width from the separation membrane and the water production diversion net. Adhesion; the water outlet side of the diversion net is not adhered to the separation membrane and the water production diversion net at the effective water outlet width. The film element according to item 13 of the application, wherein the adhesive is a polyurethane glue. A filter element includes a central water collecting pipe and at least one layer of a diversion net described in item 1 of the patent application scope or at least one membrane element described in item 10 of the patent application scope. The filtering element according to item 15 of the scope of patent application, wherein when the filtering element includes multiple layers of the membrane element, the multilayer membrane element is sequentially stacked and surrounds the central collecting pipe. The filter element according to item 15 of the scope of patent application, wherein the filter element is a cross-flow filter element.