Membrane element, membrane element manufacturing method, filtering device and water purifying equipment

Abstract

The invention discloses a membrane element, a membrane element manufacturing method, a filtering device and water purification equipment, and relates to the technical field of water purification equipment, and the membrane element comprises a main body, a first end cover and a second end cover. The main body comprises a central pipe and multiple layers of membranes wound on the outer side of the central pipe, a plurality of water inlets are formed in the side wall of the central pipe, the central pipe is provided with a first end and a second end, and a water outlet is formed in the second end of the central pipe; the first end cover is arranged at one end of the main body and is hermetically bonded with one end of the multi-layer membrane through an adhesive; and the second end cover is arranged at the other end of the main body, is hermetically adhered to the other end of the multi-layer membrane through the adhesive, and is provided with a water outlet channel butted with the water outlet. The technical scheme provided by the invention aims to improve the sealing effect of the membrane element.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification equipment, and in particular to a membrane element, a membrane element manufacturing method, a filtering device and water purification equipment. Background Art

[0002] RO membrane, or reverse osmosis membrane, is a process that uses a semipermeable membrane to separate the solvent and solute in a solution under pressure. The pore size of the RO membrane is extremely small, usually at the nanometer level, and can effectively intercept impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, etc. in the water, allowing only water molecules to pass through. This technology is widely used in seawater desalination, wastewater treatment, pure water manufacturing and other fields.

[0003] The existing RO membrane rolling method is to roll up after gluing on three sides. During the rolling process, the glue positions on both sides of the central tube are prone to form capillary tunnels due to uneven force and high stacking height of the membrane sheets, resulting in poor sealing and affecting the filtration effect of the RO membrane. Summary of the invention

[0004] The main purpose of the present invention is to provide a membrane element, a membrane element manufacturing method, a filtering device and a water purification device, aiming to improve the sealing effect of the membrane element.

[0005] To achieve the above object, the present invention provides a membrane element, comprising:

[0006] A main body, comprising a central tube and a multi-layer membrane wound on the outer side of the central tube, wherein a side wall of the central tube is provided with a plurality of water inlets, the central tube has a first end and a second end, and the second end of the central tube is provided with a water outlet; and,

[0007] A first end cap is provided at one end of the main body and is sealed and bonded to one end of the multilayer film by adhesive; and

[0008] The second end cover is arranged at the other end of the main body and is sealed and bonded to the other end of the multi-layer membrane by adhesive, and the second end cover has a water outlet channel connected with the water outlet.

[0009] In one embodiment, the membrane element comprises at least one membrane sheet, and the tails of the membrane sheet are folded in half and bonded together by adhesive.

[0010] In one embodiment, the first end of the central tube is configured as a closed end.

[0011] In one embodiment, a positioning protrusion is provided on the inner side of the first end cover, and a positioning groove for docking with the positioning protrusion is correspondingly provided on the first end of the central tube; and / or,

[0012] The second end cover is provided with a butt joint, a water outlet channel is provided inside the butt joint, and the butt joint is butt-jointed with the water outlet of the central pipe.

[0013] In one embodiment, the first end of the central tube is open, and a sealing portion is provided inside the central tube and near the first end of the central tube to seal the first end of the central tube, and the opening of the first end of the central tube forms the positioning groove.

[0014] In one embodiment, two ends of the main body are arranged flush.

[0015] The present invention also provides a method for manufacturing a membrane element, comprising the following steps:

[0016] A central tube is provided, wherein two ends of the central tube correspond to a first end and a second end, a side wall of the central tube is provided with a plurality of water inlets, and a water outlet is provided at the second end of the central tube;

[0017] Providing a membrane material, winding the membrane material on the outside of the central tube to form the multi-layer membrane sheet, wherein the multi-layer membrane sheet cooperates with the central tube to form the main body of the membrane element;

[0018] Providing a first end cap, applying adhesive on one side of the first end cap, and covering the first end cap on one end of the main body, and sealing and bonding the first end cap to one end of the multilayer film through the adhesive;

[0019] A second end cover is provided, wherein the second end cover is formed with a water outlet channel, and adhesive is applied on one side of the second end cover, and the second end cover is covered on the other end of the main body and sealed and bonded to the other end of the multilayer membrane by adhesive, and the water outlet channel is butted with the water outlet of the central tube.

[0020] In one embodiment, a membrane material is provided, and the membrane material is wound on the outside of the central tube to form the multi-layer membrane sheet, and the multi-layer membrane sheet cooperates with the central tube to form the main body of the membrane element, comprising:

[0021] A membrane material is provided, and the membrane material is sequentially stacked on a guide cloth welded on a central tube, and glue is applied to the tail of each page of the membrane material, and the membrane element is manufactured by rotating and rolling the membrane material.

[0022] In one embodiment, the method for manufacturing the membrane element further comprises:

[0023] Both ends of the main body are cut so that both ends of the main body are flush.

[0024] The present invention also provides a filtering device, comprising:

[0025] A shell having an installation space, a shell water inlet, a clean water outlet, and a concentrated water outlet; and

[0026] The membrane element comprises a main body, a first end cap, and a second end cap, the main body comprises a central tube, and a multi-layer membrane sheet wound on the outer side of the central tube, the side wall of the central tube is provided with a plurality of water inlets, the central tube has a first end and a second end, and the second end of the central tube is provided with a water outlet; the first end cap is provided at one end of the main body, and is sealed and bonded to one end of the multi-layer membrane sheet by adhesive; the second end cap is provided at the other end of the main body, and is sealed and bonded to the other end of the multi-layer membrane sheet by adhesive, and the second end cap has a water outlet channel docked with the water outlet, the membrane element is provided in the installation space, and a water passage is defined between the outer side of the membrane element and the inner side of the shell;

[0027] Wherein, the water outlet channel is communicated with the clean water outlet, and the water passage channel is communicated with the shell water inlet and the concentrated water outlet respectively.

[0028] In one embodiment, the filtering device further comprises:

[0029] A sealing ring is arranged in the water passage to separate the water passage into a first passage and a second passage, wherein the first passage is connected to the second passage through the multi-layer membrane; wherein

[0030] The first channel is communicated with the water inlet of the shell, and the second channel is communicated with the concentrated water outlet.

[0031] The present invention further provides a water purification device, comprising the filtering device, wherein the filtering device comprises:

[0032] A shell having an installation space, a shell water inlet, a clean water outlet, and a concentrated water outlet; and

[0033] The membrane element includes a main body, a first end cap, and a second end cap. The main body includes a central tube and a multi-layer membrane wound on the outside of the central tube. The side wall of the central tube is provided with multiple water inlets. The central tube has a first end and a second end. The second end of the central tube is provided with a water outlet. The first end cap is provided at one end of the main body and is sealed and bonded to one end of the multi-layer membrane by adhesive. The second end cap is provided at the other end of the main body and is sealed and bonded to the other end of the multi-layer membrane by adhesive, and the second end cap has a water outlet channel docked with the water outlet. The membrane element is provided in the installation space, and a water passage is defined between the outer side of the membrane element and the inner side of the shell.

[0034] Wherein, the water outlet channel is communicated with the clean water outlet, and the water passage channel is communicated with the shell water inlet and the concentrated water outlet respectively.

[0035] The technical solution of the present invention is to bond the two ends of the multi-layer diaphragm with the first end cap and the second end cap respectively by means of adhesive, so that the adhesive coating thickness at the two ends of the multi-layer diaphragm can be kept consistent, so that the sealing performance of the sealing parts at both ends is kept uniform, thereby effectively preventing water from leaking from both sides of the multi-layer diaphragm, improving the bonding quality between the diaphragm and the end cap, and also improving the sealing performance of the entire structure, preventing leakage or degradation of diaphragm performance caused by uneven adhesive coating. Since the second end of the central tube is provided with a water outlet and docked with the water outlet channel on the second end cap, the treated water can be discharged smoothly, reducing fluid resistance, thereby improving the working efficiency of the overall equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 A schematic structural diagram of an embodiment of a membrane element provided by the present invention;

[0038] Figure 2 for Figure 1 Schematic diagram of the middle section;

[0039] Figure 3 for Figure 1 Schematic diagram of the decomposition;

[0040] Figure 4 for Figure 1 Schematic diagram of the structure of the multilayer membrane;

[0041] Figure 5 A cross-sectional schematic diagram of an embodiment of a filtering device provided by the present invention.

[0042] Description of Figure Numbers:

[0043] 100. Membrane element;

[0044] 1. Main body; 11. Central tube; 111. First end; 112. Second end; 113. Water inlet; 114. Water outlet; 115. Blocking part; 116. Positioning groove; 12. Multilayer membrane; 13. Protective membrane with holes; 14. Sealing ring;

[0045] 2. first end cover; 21. positioning convex portion;

[0046] 3. Second end cover; 31. Water outlet channel; 32. Butt joint;

[0047] 200. Filtering device;

[0048] 4. Shell; 41. Installation space; 42. Shell water inlet; 43. Clean water outlet; 44. Concentrated water outlet; 45. Water passage; 451. First passage; 452. Second passage.

[0049] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] RO membrane, or reverse osmosis membrane, is a process that uses a semipermeable membrane to separate the solvent and solute in a solution under pressure. The pore size of the RO membrane is extremely small, usually at the nanometer level, and can effectively intercept impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, etc. in the water, allowing only water molecules to pass through. This technology is widely used in seawater desalination, wastewater treatment, pure water manufacturing and other fields.

[0054] The existing RO membrane rolling method is to roll up after gluing on three sides. During the rolling process, since the glue has not solidified, the position and thickness of the pre-applied glue will change as the winding continues, making the final RO membrane easily have two sides of the glue, reducing the quality of the finished product.

[0055] like Figures 1 to 4 As shown, in order to solve the above technical problems, a membrane element 100 proposed in the present invention includes a main body 1, a first end cap 2, and a second end cap 3. The main body 1 includes a central tube 11, and a multilayer membrane sheet 12 wound on the outside of the central tube 11, the side wall of the central tube 11 is provided with a plurality of water inlets 113, the central tube 11 has a first end 111 and a second end 112, and the second end 112 of the central tube 11 is provided with a water outlet 114; the first end cap 2 is provided at one end of the main body 1, and is sealed and bonded to one end of the multilayer membrane sheet 12 by adhesive; the second end cap 3 is provided at the other end of the main body 1, and is sealed and bonded to the other end of the multilayer membrane sheet 12 by adhesive, and the second end cap 3 has a water outlet channel 31 docking with the water outlet 114.

[0056] The technical solution of the present invention is to bond the two ends of the multilayer diaphragm 12 to the first end cap 2 and the second end cap 3 by adhesive respectively, so that the adhesive coating thickness at the two ends of the multilayer diaphragm 12 can be kept consistent, so that the sealing performance of the two ends of the seal is kept uniform, thereby effectively preventing water from leaking from both sides of the multilayer diaphragm 12, improving the bonding quality between the multilayer diaphragm 12 and the first end cap 2 and the second end cap 3, and also improving the sealing performance of the entire structure, preventing leakage caused by uneven adhesive coating. Since the second end 112 of the central tube 11 is provided with a water outlet 114 and docked with the water outlet channel 31 on the second end cap 3, the treated water can be discharged smoothly, reducing fluid resistance, thereby improving the working efficiency of the overall equipment.

[0057] It can be understood that by setting up multiple water inlets 113, water can flow through the multi-layer membrane 12 and enter the water inlet 113 at multiple locations on the side wall of the central tube 11, thereby achieving a more uniform water flow distribution, which helps to improve the water treatment efficiency of the multi-layer membrane 12 and make the filtration or purification process more efficient.

[0058] In one embodiment, the membrane element 100 includes at least one membrane sheet, and the tails of the membrane sheet are folded in half and bonded together by adhesive.

[0059] It can be understood that the membrane forms a sealed membrane bag through tail adhesion and sealing on both sides, thereby ensuring that the water flowing out of the water outlet of the central tube is filtered by the membrane.

[0060] In one embodiment, the first end 111 of the central tube 11 is configured as a closed end.

[0061] In this way, by setting the first end 111 of the central tube 11 as a closed end, the central tube 11 is provided with no opening at the first end 111, so that the water can only flow out from the second end 112 of the central tube 11. All incoming water must be filtered through the multi-layer membrane 12 before being discharged from the water outlet 114, thereby ensuring the consistency and reliability of the treated water quality.

[0062] It is understandable that the sealing method can be completed by hot melt sealing, injection molding sealing, welding sealing, adhesive sealing, and mechanical sealing, which can be adaptively selected according to actual production needs and is not particularly limited here.

[0063] In one embodiment, a positioning protrusion 21 is disposed on the inner side of the first end cover 2 , and a positioning groove 116 that docks with the positioning protrusion 21 is correspondingly disposed at the first end 111 of the central tube 11 .

[0064] In this way, by inserting the positioning protrusion 21 into the positioning groove 116 of the first end 111, the first end cap 2 can be reduced from being offset or rotated during the assembly process, thereby ensuring the correct alignment between the first end cap 2 and the multi-layer membrane 12. In this way, when applying adhesive for sealing, it can be ensured that the adhesive is evenly distributed, thereby enhancing the sealing effect and reducing the potential risk of leakage.

[0065] It is understandable that the shape of the positioning protrusion 21 can be cylindrical, conical, polygonal, or annular, and can be adaptively selected according to actual production needs, and is not particularly limited here.

[0066] In one embodiment, the first end 111 of the central tube 11 is open, and a sealing portion 115 is provided inside the central tube 11 and near the first end 111 of the central tube 11 to seal the first end 111 of the central tube 11, and the opening of the first end 111 of the central tube 11 forms the positioning groove 116.

[0067] In one embodiment, the second end cover 3 is provided with a butt joint 32 , a water outlet channel 31 is provided inside the butt joint 32 , and the butt joint 32 is butt-jointed with the water outlet 114 of the central pipe 11 .

[0068] In this way, the water flowing out of the water outlet 114 of the central tube 11 can be smoothly guided to the external pipe or other receiving device through the butt joint 32. The water outlet channel 31 arranged inside the butt joint 32 is directly connected with the water outlet 114 of the central tube 11, so that the water flows smoothly and unimpeded, reducing the flow resistance and improving the drainage efficiency.

[0069] It is understandable that the butt joint 32 is usually designed with a standard interface to facilitate connection with other pipes or accessories, thereby simplifying the installation and maintenance process of the system.

[0070] In one embodiment, a sealing ring is provided at the connection between the butt joint 32 and the central pipe 11 to further enhance the sealing effect, thereby reducing the possibility of leakage.

[0071] In one embodiment, two ends of the main body 1 are arranged flush.

[0072] In this way, by making the two ends of the main body 1 flush, it is easier to achieve accurate alignment during the assembly process. Whether it is connected with the first end cover 2 or the second end cover 3, the flush end faces can ensure that the contact surface between the two end covers and the main body 1 is more flat, reducing the difficulty of assembly. When using adhesive for sealing, the flush end faces can ensure that the thickness of the adhesive is evenly distributed, reducing the problem of poor sealing caused by uneven surfaces.

[0073] In one embodiment, a perforated protective film 13 is further disposed on the outer side of the multi-layer film 12 .

[0074] In this way, the multi-layer membrane 12 can be wrapped and tightened by the perforated protective film 13 to protect it, while not affecting the movement of water flow.

[0075] The present invention also provides a method for manufacturing a membrane element 100, comprising the following steps:

[0076] A central tube 11 is provided, wherein two ends of the central tube 11 correspond to a first end 111 and a second end 112, a side wall of the central tube 11 is provided with a plurality of water inlets 113, and the second end 112 of the central tube 11 is provided with a water outlet 114;

[0077] Providing a membrane material, and winding the membrane material on the outside of the central tube 11 to form the multi-layer membrane sheet 12, wherein the multi-layer membrane sheet 12 cooperates with the central tube 11 to form the main body 1 of the membrane element 100;

[0078] A first end cap 2 is provided, and adhesive is applied on one side of the first end cap 2. The first end cap 2 is covered on one end of the main body 1 and is sealed and bonded to one end of the multilayer film 12 through the adhesive.

[0079] A second end cover 3 is provided, and a water outlet channel 31 is formed in the second end cover 3. Adhesive is applied on one side of the second end cover 3, and the second end cover 3 is covered on the other end of the main body 1 and sealed and bonded to the other end of the multilayer membrane 12 by adhesive. The water outlet channel 31 is connected to the water outlet 114 of the central tube 11.

[0080] In this way, by bonding the two ends of the multilayer diaphragm 12 to the first end cap 2 and the second end cap 3 respectively by adhesive, the adhesive coating thickness at the two ends of the multilayer diaphragm 12 can be kept consistent, so that the sealing performance of the two ends of the seal is kept uniform, thereby effectively preventing water from leaking from both sides of the multilayer diaphragm 12, improving the bonding quality between the multilayer diaphragm 12 and the first end cap 2 and the second end cap 3, and also improving the sealing performance of the entire structure, preventing leakage caused by uneven adhesive coating. Since the second end 112 of the central tube 11 is provided with a water outlet 114 and docked with the water outlet channel 31 on the second end cap 3, the treated water can be discharged smoothly, reducing fluid resistance, thereby improving the working efficiency of the overall equipment.

[0081] In one embodiment, a membrane material is provided, and the membrane material is wound on the outside of the central tube 11 to form the multilayer membrane sheet 12. The multilayer membrane sheet 12 cooperates with the central tube 11 to form the main body 1 of the membrane element 100, including:

[0082] A membrane material is provided, and the membrane material is sequentially stacked on a guide cloth welded on a central tube, and glue is applied to the tail of each page of the membrane material, and the membrane element is manufactured by rotating and rolling the membrane material.

[0083] In this way, by winding the membrane material on the outside of the central tube and applying glue to the tail of each membrane material, the stability and tightness between the layers of membrane material can be ensured, and interlayer sliding or misalignment can be prevented during use, thereby ensuring the overall structural stability and sealing of the membrane element. In addition, this winding method can also adjust the number of membrane layers according to actual needs, flexibly control the filtration area of ​​the membrane element, and thus optimize its filtration efficiency and flux.

[0084] In one embodiment, the method for manufacturing the membrane element 100 further includes:

[0085] Both ends of the main body 1 are cut so that both ends of the main body 1 are flush.

[0086] In this way, by making the two ends of the main body 1 flush, it is easier to achieve accurate alignment during the assembly process. Whether it is connected with the first end cover 2 or the second end cover 3, the flush end surface can ensure that the contact surface between the two end covers and the main body 1 is more flat, reducing the difficulty of assembly. When using adhesive for sealing, the flush surface can ensure that the thickness of the adhesive is evenly distributed, avoiding the problem of poor sealing caused by uneven surface.

[0087] like Figure 5 As shown, the present invention also proposes a filter device 200, which includes a shell 4 and a membrane element 100. The specific structure of the membrane element 100 refers to the above embodiment. Since the filter device 200 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The shell has an installation space 41, a shell water inlet 42, a clean water outlet 43, and a concentrated water outlet 44; the membrane element 100 is arranged in the installation space 41, and a water passage 45 is defined between the outer side of the membrane element 100 and the inner side of the shell 4; the water outlet channel 31 is connected to the clean water outlet 43, and the water passage 45 is respectively connected to the shell water inlet 42 and the concentrated water outlet 44.

[0088] In this way, water flows from the water inlet 42 of the housing into the water passage 45, and part of the water in the water passage 45 enters the clean water outlet 43 through the multiple water inlets 113 after being filtered by the multi-layer membrane 12, and part of the water in the water passage 45 flows out through the concentrated water outlet 44, and in this process, concentrated water with high ion content is taken away, so that the clean water and concentrated water are clearly separated, and the water purification efficiency of the filter device 200 is improved.

[0089] In one embodiment, the filtration device 200 also includes a sealing ring 14, which is arranged in the water passage 45 to separate the water passage 45 into a first channel 451 and a second channel 452, and the first channel 451 is connected to the second channel 452 through the multi-layer membrane 12; wherein the first channel 451 is connected to the shell water inlet 42, and the second channel 452 is connected to the concentrated water outlet 44.

[0090] In this configuration, the water passage 45 is separated into the first passage 451 and the second passage 452 by the sealing ring 14, so that after the raw water enters the first passage 451 from the water inlet 42 of the housing, it must be filtered through the multi-layer membrane 12 before entering the second passage 452. The water flow path is clearly separated so that all incoming water flows need to be filtered through the multi-layer membrane 12. The first passage 451 is connected to the second passage 452 through the multi-layer membrane 12, so that the water flow can fully contact the membrane surface when passing through the membrane, thereby improving the filtering efficiency.

[0091] In one embodiment, the sealing ring 14 is a Y-shaped sealing ring 14 .

[0092] In this configuration, the Y-shaped sealing ring 14 can better fit the contact surface when under pressure due to its unique cross-sectional shape (similar to the letter "Y"), forming a good sealing effect. The two sides of the Y-shaped sealing ring 14 can be in close contact with the inner wall of the water passage 45 and the membrane element 100 respectively, ensuring that water will not leak from the sealing ring 14.

[0093] The present invention also proposes a water purification device, which includes a filtering device 200. The specific structure of the filtering device 200 refers to the above embodiment. Since the water purification device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0094] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A membrane element, characterized in that: include: A main body, comprising a central tube and a multi-layer membrane wound on the outer side of the central tube, wherein a side wall of the central tube is provided with a plurality of water inlets, the central tube has a first end and a second end, and the second end of the central tube is provided with a water outlet; and, A first end cap is provided at one end of the main body and is sealed and bonded to one end of the multilayer film by adhesive; and The second end cover is arranged at the other end of the main body and is sealed and bonded to the other end of the multi-layer membrane by adhesive, and the second end cover has a water outlet channel connected with the water outlet.

2. The membrane element according to claim 1, characterized in that The membrane element comprises at least one membrane sheet, and the tails of the membrane sheet are folded and bonded by adhesive.

3. The membrane element according to claim 1, characterized in that The first end of the central tube is configured as a closed end.

4. The membrane element according to claim 1, characterized in that A positioning protrusion is provided on the inner side of the first end cover, and a positioning groove docking with the positioning protrusion is correspondingly provided on the first end of the central tube; and / or, The second end cover is provided with a butt joint, a water outlet channel is provided inside the butt joint, and the butt joint is butt-jointed with the water outlet of the central pipe.

5. The membrane element according to claim 4, characterized in that The first end of the central tube is open, and a blocking portion is provided inside the central tube and near the first end of the central tube to block the first end of the central tube. The opening of the first end of the central tube forms the positioning groove.

6. The membrane element according to claim 1, characterized in that The two ends of the main body are arranged flush.

7. A method for manufacturing a membrane element, characterized in that: The following steps are involved: A central tube is provided, wherein two ends of the central tube correspond to a first end and a second end, a side wall of the central tube is provided with a plurality of water inlets, and a water outlet is provided at the second end of the central tube; Providing a membrane material, winding the membrane material on the outside of the central tube to form the multi-layer membrane sheet, wherein the multi-layer membrane sheet cooperates with the central tube to form the main body of the membrane element; Providing a first end cap, applying adhesive on one side of the first end cap, and covering the first end cap on one end of the main body, and sealing and bonding the first end cap to one end of the multilayer film through the adhesive; A second end cover is provided, wherein the second end cover is formed with a water outlet channel, and adhesive is applied on one side of the second end cover, and the second end cover is covered on the other end of the main body and sealed and bonded to the other end of the multilayer membrane by adhesive, and the water outlet channel is butted with the water outlet of the central tube.

8. The method for manufacturing a membrane element according to claim 7, characterized in that: The steps of providing a membrane material, winding the membrane material on the outside of the central tube to form the multi-layer membrane sheet, and cooperating the multi-layer membrane sheet with the central tube to form the main body of the membrane element include: A membrane material is provided, and the membrane material is sequentially stacked on a guide cloth welded on a central tube, and glue is applied to the tail of each page of the membrane material, and the membrane element is manufactured by rotating and rolling the membrane material.

9. The method for manufacturing a membrane element according to claim 7, wherein: The method for manufacturing the membrane element further comprises: Both ends of the body are cut so that both ends of the body are flush.

10. A filtering device, characterized in that: include: The shell has an installation space, a shell water inlet, a clean water outlet, and a concentrated water outlet; as well as, The membrane element according to any one of claims 1 to 6, wherein the membrane element is arranged in the installation space, and a water passage is defined between the outer side of the membrane element and the inner side of the shell; Wherein, the water outlet channel is communicated with the clean water outlet, and the water passage channel is communicated with the shell water inlet and the concentrated water outlet respectively.

11. The filtering device according to claim 10, characterized in that The filtering device also includes: A sealing ring is arranged in the water passage to separate the water passage into a first passage and a second passage, wherein the first passage is connected to the second passage through the multi-layer membrane; wherein The first channel is communicated with the water inlet of the shell, and the second channel is communicated with the concentrated water outlet.

12. A water purification device, characterized in that: Comprising the filtering device as described in any one of claims 10-11.

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