Flexible flat sheet membrane element, flexible flat sheet membrane assembly and manufacturing method thereof
By using a support diversion net of 3D flexible textile material and a filter membrane made of PVDF or PTFE material in the flexible flat film, combined with welding points and built-in water outlet design, the problems of poor flatness and weak structural strength of the flexible flat film are solved, and higher filling density and pollution resistance are achieved.
Patent Information
- Application Number
- CN202411972032.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-03-28
AI Technical Summary
The existing flexible flat film has problems such as poor flatness, weak structural strength, and complex assembly, which limits its application in the field of sewage treatment.
The supporting diversion net made of 3D flexible textile material is combined with filter membranes made of PVDF or PTFE. The connection is strengthened by welding points. The built-in water outlet and water collection chamber are designed to form a tightly arranged flexible flat membrane assembly.
It improves the flatness and structural strength of the diaphragm, reduces production costs, improves the loading density and pollution resistance, and extends the service life.
Smart Images
Figure CN119701648A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of sewage treatment products, and in particular to a flexible flat membrane element, a flexible flat membrane assembly and a manufacturing method thereof. Background Art
[0002] Membrane Bio-Reactor (MBR) is a new type of wastewater treatment system that organically combines membrane separation technology with biological treatment technology. It uses membrane components to replace the secondary sedimentation tank at the end of traditional biological treatment technology to achieve solid-liquid separation. The membrane bioreactor mainly uses membrane separation equipment to intercept activated sludge and macromolecular organic matter in the water. In the membrane bioreactor, it can maintain a high activated sludge concentration and increase the organic load of biological treatment, thereby reducing the footprint of sewage treatment facilities and reducing the amount of residual sludge by maintaining a low sludge load. Compared with traditional biological treatment processes, MBR membrane bioreactors have higher treatment efficiency and better water quality stability. They can efficiently remove organic matter, ammonia, phosphorus and other pollutants in sewage. At the same time, they can also achieve solid-liquid separation and water reuse. MBR membrane bioreactors can be applied to a variety of different sewage treatment occasions.
[0003] Commercial MBR membrane elements are mainly flat membranes and hollow fiber membranes. Flat membranes have a large membrane area and high flux, and are suitable for the treatment of high-concentration and high-turbidity water bodies. Traditional rigid flat membrane elements in China are usually composed of two layers of flat membranes, two layers of supporting linings and a supporting plate. The supporting plates are mostly solid ABS plates with water collection grooves on both sides. They have good mechanical stability, more convenient cleaning methods, longer cleaning cycles, long life, and low operating costs. In order to maintain a high water flux and membrane surface utilization rate in engineering, the flat membrane element support plate is often larger in size, such as 1.8 meters × 0.5 meters. The thickness of the support plate is generally 5.5 mm to 6 mm, and the required thickness of the support plate increases exponentially with the increase in area. The support plate is mostly a solid plate, and its cost accounts for about 40% to 60% of the entire membrane element. Therefore, it also has the disadvantages of low packing density, small aeration vibration, easy to cause sludge to adhere to the membrane surface, and high production cost, which seriously limits the promotion and application of flat membranes.
[0004] In recent years, flexible flat membranes have emerged. Compared with traditional rigid flat membrane elements, flexible flat membranes have no support plates and have the following advantages: no hard plate support is required, which greatly reduces manufacturing costs; the thickness of the membrane element can be made very thin, which is conducive to increasing the filtration area of the unit volume of the membrane assembly, increasing the filling density of the membrane pool, and reducing the project cost. In addition, it has the advantages of small footprint, low aeration energy consumption, and improved membrane mud pollution, which has been widely recognized. However, the flexible flat membranes in the prior art have problems such as poor flatness, weak overall structural strength, and complex assembly. Summary of the invention
[0005] In order to improve the structural strength and flatness of a flexible flat membrane, the present application provides a flexible flat membrane element, a flexible flat membrane assembly and a manufacturing method thereof.
[0006] In the first aspect, the present application provides a flexible flat membrane element adopting the following technical solution: A flexible flat membrane element comprises a first filter membrane, a second filter membrane and a supporting guide net, wherein the supporting guide net is made of 3D flexible textile material, a water filtration cavity is formed between the first filter membrane and the second filter membrane, the supporting guide net is located in the water filtration cavity between the first filter membrane and the second filter membrane, and the first filter membrane and the second filter membrane are also provided with a plurality of welding points welded to the supporting guide net; a water collecting part is provided at least at one end of the first filter membrane, the second filter membrane and the supporting guide net, a water collecting cavity is provided in the water collecting part, and the water collecting cavity is a flat groove opened on the water collecting part, the notch of the flat groove faces the water filtration cavity and the water collecting cavity is connected to the water filtration cavity, and the two sides of the flat groove penetrate through the two ends of the water collecting part to form the built-in water outlet.
[0007] By adopting the above technical solution, the flexible flat membrane element in this application eliminates the rigid plate frame flat membrane support of the original traditional flat membrane made of ABS material, and selects a support guide net made of a certain thickness of 3D flexible textile material, so that the thickness of the entire membrane is greatly reduced, and the support guide net with a special structure maintains sufficient flatness of the flat membrane. The flexible flat membrane element in this application solves the problems of low packing density, high production cost, small swing during aeration in water, easy adhesion of sludge to the membrane surface, and easy occurrence of membrane fouling accidents.
[0008] In the present application, a plurality of welding points distributed on the first filter membrane and the second filter membrane and welded to the supporting guide mesh ensure that during the reverse cleaning process, the flat membrane does not have a "bulging belly" phenomenon causing damage to the membrane element.
[0009] Optionally, the length direction of the water collecting component is arranged along the width direction of the supporting guide net and the length of the water collecting component is greater than the width of the first filter membrane, the second filter membrane and the supporting guide net; the width direction of the water collecting component is consistent with the height direction of the entire flat membrane element.
[0010] By adopting the above technical solution, the original protruding external water outlet structure of the flat membrane water collecting component is changed, so that the built-in water outlet of the water collecting component is an integral built-in structure. During installation, the built-in water outlet is not subjected to stress, the strength is greatly increased, and the water outlet efficiency is greatly improved.
[0011] Optionally, the first filter membrane, the second filter membrane and both ends of the supporting guide net are provided with the water collecting parts; both sides of each water collecting part have welding lines; the two ends of the first filter membrane and the second filter membrane are respectively welded at the corresponding welding lines of the water collecting parts.
[0012] By adopting the above technical solution, the effective collection and discharge of water flow is ensured, and the overall stability and reliability of the membrane element are improved. The welding lines on both sides of the water collection piece make the welding position of the first filter membrane and the second filter membrane more precise, the connection is more stable and reliable, the structural strength of the membrane element is enhanced, the risk of leakage is reduced, and the service life and anti-pollution ability of the membrane element are improved.
[0013] Optionally, the thickness of the supporting guide net is 1 mm to 3 mm, and the material thereof is a mixed material of PE and PP with a multi-layer woven structure.
[0014] By adopting the above technical solution, the support and guide net has a certain flexibility and sufficient support strength. The thickness of the support and guide net is controlled within the range of 1mm to 3mm, so that the membrane element can generate sufficient vibration in the aeration environment, effectively preventing sludge from sticking and enhancing anti-pollution ability.
[0015] Optionally, the planar thickness of the water collecting part is 4 mm to 6 mm, and the material of the water collecting part is ABS; the base materials of the first filter membrane and the second filter membrane are both non-woven fabrics including main fiber PET and hot-melt bonding fiber, and the membrane layers of the first filter membrane and the second filter membrane are made of PVDF or PTFE.
[0016] By adopting the above technical solution, the structural stability and sufficient strength of the water collecting part are ensured, while the overall weight is reduced and the production cost is reduced. The water collecting part is made of ABS material, which has good mechanical properties and processing properties and is easy to produce and install. The material of the first filter membrane and the second filter membrane is convenient for welding and assembly, while improving the mechanical strength and durability of the membrane, and has excellent chemical stability and anti-pollution ability, maintaining good filtering performance.
[0017] In the second aspect, the present application provides a flexible flat membrane assembly adopting the following technical solution: A flexible flat membrane assembly, comprising a plurality of the above-mentioned flexible flat membrane elements, each of which comprises two water collecting parts, which are respectively located at the two ends of the first filter membrane, the second filter membrane and the supporting guide net, and the flexible flat membrane assembly further comprises a first membrane shell, a second membrane shell, a third membrane shell and a fourth membrane shell; the first membrane shell and the second membrane shell are respectively located at the two ends of one of the water collecting parts, and the third membrane shell and the fourth membrane shell are respectively located at the two ends of the other water collecting part; The first membrane shell, the second membrane shell, the third membrane shell and the fourth membrane shell are each provided with a plurality of snap-in grooves and a plurality of snap-in holes; a plurality of the flexible flat membrane elements are stacked in layers; a plurality of the snap-in grooves and the snap-in holes are arranged one by one in correspondence with the flexible flat membrane elements, the flexible flat membrane elements are snap-fitted into the corresponding snap-in grooves and the ends of the water collecting parts in the flexible flat membrane elements are snap-fitted into the corresponding snap-in holes; the first membrane shell and the third membrane shell are also provided with water collecting joints which are connected to the built-in water outlets of the corresponding water collecting parts.
[0018] By adopting the above technical solution, the material used in the entire flexible flat membrane assembly is reduced, the weight is reduced, and it is easy to transport and install. The membrane elements are closely arranged, which greatly improves the packing density of the membrane assembly, which is 40% higher than that of conventional flat membranes. The overall manufacturing cost is only 70% or even lower than that of traditional membrane elements, and the service life is longer.
[0019] Optionally, the materials of the first membrane shell, the second membrane shell, the third membrane shell and the fourth membrane shell are all ABS or UPVC; the first membrane shell, the second membrane shell, the third membrane shell and the fourth membrane shell all include a box body and an end cover, one side of the box body has an opening, the end cover is sealed and fixed on the other side of the box body, a partition is arranged in the box body and a connecting cavity is formed between the partition and the end cover; the snap-in grooves are arranged in rows on the side wall of the box body close to the opening; the snap-in holes are arranged in rows on the partition; the built-in water outlet of the water collecting part is connected to the corresponding connecting cavity, and the water collecting joints on the first membrane shell and the third membrane shell are connected to the corresponding connecting cavity.
[0020] By adopting the above technical solution, the flexible flat membrane element can be accurately snapped into the membrane shell, ensuring the stability and consistency of the membrane element, reducing installation errors, lowering maintenance costs, and making the overall structure stable and reliable.
[0021] Optionally, a plurality of bosses are arranged at intervals on the outer side of the water collecting member along the length direction of the water collecting member, a boss is arranged on one side of the boss, and a groove is arranged on the other side; in two adjacent flexible flat membrane elements, the boss on the boss in one of the flexible flat membrane elements can be inserted into the groove on the corresponding boss in the other flexible flat membrane element.
[0022] By adopting the above technical solution, the bosses in two adjacent flexible flat membrane elements are interlocked, so that the spacing between adjacent membrane elements remains stable, avoiding the displacement of the membrane elements due to water flow impact during operation, thereby reducing the friction and wear between the membrane elements and increasing the service life of the membrane elements. At the same time, this structural design ensures the smooth flow of the aeration channel, prevents the membrane surface from being blocked due to the membrane elements being too close together, and further enhances the anti-pollution ability of the membrane assembly.
[0023] In a third aspect, the present application provides a method for manufacturing a flexible flat membrane assembly using the following technical solution: A method for manufacturing a flexible flat membrane assembly, used for manufacturing the above-mentioned flexible flat membrane assembly, comprises the following steps: S1. Making flexible flat membrane elements: Weave or weld a 3D structure support guide net with a multi-layer woven structure of PE and PP mixed materials; use a non-woven fabric including main fiber PET and hot-melt bonding fiber as the membrane substrate, use PVDF or PTFE material to make the membrane layer, and the membrane layer and the membrane substrate are bonded to form a filter membrane; both ends of the support guide net are provided with water collection parts, and both sides of the support guide net are provided with filter membranes, and both ends of the filter membrane are welded to the side of the water collection parts; and the edges of the filter membrane in the height direction are welded all along the line, and the closed element after welding is evenly hot-melt welded to the membrane surface of the filter membrane by 5 to 8 cylinders to form welding points, thereby forming a flexible flat membrane element; S2, assembling the flexible flat membrane assembly: select a number of flexible flat membrane elements made in step S1 and stack them layer by layer, place four membrane shells at the four corners of the flexible flat membrane elements respectively, and clamp the several flexible flat membrane elements in the clamping grooves of the four membrane shells respectively; the ends of the water collecting parts of the flexible flat membrane elements are clamped in the corresponding clamping holes of the four membrane shells respectively; S3. Packaging: The four membrane shells are filled with glue for packaging.
[0024] By adopting the above technical solution, the membrane element is fixed in the membrane shell through the snap-in groove and the snap-in hole, which simplifies the installation steps, reduces the installation workload, and improves the installation efficiency. Through the glue filling and packaging, firstly, it makes up for the gap that may be caused by the transition of the membrane element from a thick hard water collecting part to a thinner soft membrane during welding, and secondly, it effectively fills the gap between the membrane element and the membrane shell, ensuring the sealing and overall strength of the membrane assembly. The support and guide net of the membrane element adopts 3D flexible textile material, which not only enhances the mechanical strength of the membrane element, but also ensures the stability and durability of the membrane element during use. The support and guide net design of the membrane element makes the diaphragm shake a lot in the aeration environment, effectively preventing sludge from adhering to the membrane surface and reducing the risk of membrane fouling. In this application, the membrane elements are arranged in sequence, and the packing density is increased by 40% compared with conventional flat membranes, while reducing the production cost by more than 30%.
[0025] Optionally, in step S1, the material of the water collecting part is ABS. When the water collecting part, the filter membrane and the supporting guide net are assembled, firstly, two filter membranes, a supporting guide net and two water collecting parts are hot-melt welded into a closed component. At this time, the welding temperature is higher than the melting point of ABS, PE and PP, and lower than the melting point of PET; The welding temperature of the membrane surface of the filter membrane is higher than the melting point of PE and lower than the melting point of PP.
[0026] By adopting the above technical solution, it is ensured that the water collection parts have good mechanical strength and chemical corrosion resistance. When assembling the water collection parts, filter membranes and support guide nets, firstly, two filter membranes, a support guide net and two water collection parts are hot-melt welded into a closed component. The welding temperature is higher than the melting point of ABS, PE and PP but lower than the melting point of PET, which effectively prevents the material from being damaged by overheating and ensures the firm connection between the components. The closed component after welding is then evenly hot-melt welded to the membrane surface of the filter membrane by 5 to 8 cylinders. The welding temperature is higher than the melting point of PE but lower than the melting point of PP, which further enhances the overall structural strength of the membrane element, improves the pressure resistance and anti-pollution ability of the membrane element, and prolongs the service life.
[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. In this application, the rigid plate support of the original ABS material of the traditional flat membrane is cancelled, so that the material used in the entire flexible flat membrane component is reduced, the cost is greatly reduced, the production cost can be reduced by more than 30%, and the service life is longer.
[0028] 2. The present application reduces the weight of the entire flexible flat membrane assembly, which is convenient for transportation and installation.
[0029] 3. This application is not limited by the size of the water outlet of a single membrane element. The membrane elements can be arranged in sequence. The membrane elements are arranged closely, which greatly improves the packing density of the membrane assembly. The packing density is increased by 40% compared with conventional flat membranes.
[0030] 4. In this application, the minimum thickness of the diaphragm can be less than 1mm. The diaphragm has a large vibration in the aeration environment and has strong anti-pollution ability.
[0031] 5. The membrane elements in this application are welded together, the strength is greatly improved, there are water outlets on the top and bottom, the backwashing pressure resistance is increased, and backwashing with a pump can be achieved.
[0032] 6. In this application, the membrane surface is welded at multiple points regularly to avoid damage to the membrane layer caused by excessive expansion and friction between the filter membrane sheets.
[0033] 7. In the present application, multiple membrane elements form a membrane assembly and are filled with glue, which can make up for the gaps that may be caused by the transition of the membrane elements from thicker hard water-collecting parts to thinner soft membranes. After the glue is filled, the possible gaps in the membrane elements and the connection points with the outside world are blocked; the weak stress areas are reinforced for a second time, with higher strength and longer life.
[0034] 8. In the present application, the bosses of adjacent water-collecting parts are in contact with each other to provide hard support, and the two water-collecting parts will not fit together during operation, thus keeping the aeration channel unobstructed and avoiding the loss of membrane area due to the adhesion of adjacent membrane sheets. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1It is a schematic diagram of the internal structure of the flexible flat membrane element in this application.
[0036] Figure 2 It is a schematic diagram of the three-dimensional structure of the flexible flat membrane element in this application.
[0037] Figure 3 It is a schematic diagram of the three-dimensional structure of the water collecting part in the flexible flat membrane element.
[0038] Figure 4 It is a schematic diagram of the three-dimensional structure of the flexible flat membrane assembly in this application.
[0039] Figure 5 It is a schematic diagram of the three-dimensional structure of the second membrane shell and the fourth membrane shell in the flexible flat membrane assembly.
[0040] Figure 6 It is a schematic diagram of the three-dimensional structure of the first membrane shell and the third membrane shell in the flexible flat membrane assembly.
[0041] In the figure: 10. The first filter membrane; 20. A second filter membrane; 30. Support the diversion net; 40. Water filter cavity; 50. water collecting part; 51. water collecting chamber; 52. built-in water outlet; 53. welding line; 54. retaining edge; 55. boss; 551. boss; 552. groove; 60. first membrane shell; 61. second membrane shell; 62. third membrane shell; 63. fourth membrane shell; 64. step; 65. box body; 651. snap-fit groove; 66. partition plate; 661. snap-fit hole; 67. end cover; 671. water collecting joint; 68. connecting cavity; 70. Welding point. DETAILED DESCRIPTION
[0042] The following will be combined with the attached Figure 1 -Attached Figure 6 , the technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.
[0043] Reference Figure 1 and Figure 2As shown, the flexible flat membrane element provided in this embodiment includes a first filter membrane 10, a second filter membrane 20, a support guide net 30 and two water collecting parts 50, and the first filter membrane 10, the second filter membrane 20 and the support guide net 30 are all rectangular. The first filter membrane 10, the second filter membrane 20 and the support guide net 30 have the same width, and the length of the first filter membrane 10 and the second filter membrane 20 is greater than the length of the support guide net 30; the support guide net 30 in this application is made of 3D flexible textile material. Specifically, the material of the support guide net 30 is a mixed material of PE and PP with a multi-layer woven structure, and a three-dimensional structure with a thickness of 1mm to 3mm is formed by weaving or welding, so that the support guide net 30 has sufficient flexibility and sufficient support strength. The first filter membrane 10 and the second filter membrane 20 are both filter membranes. The first filter membrane 10 and the second filter membrane 20 include a membrane substrate and a membrane layer. The membrane substrate is made of a non-woven fabric including a main fiber PET and a hot-melt bonding fiber. The membrane layer is made of a PVDF or PTFE material, and the membrane layer is bonded to the membrane substrate. The first filter membrane 10 and the second filter membrane 20 are arranged in parallel and spaced apart, and the two are respectively located at the two sides of the support guide net 30. The first filter membrane 10 and the second filter membrane 20 are bonded to the support guide net 30. Two water collecting parts 50 are located at the two ends of the support guide net 30, and the two ends of the first filter membrane 10 and the second filter membrane 20 are connected to the two water collecting parts 50. A water filtering cavity 40 is formed between the first filter membrane 10 and the second filter membrane 20, and the support guide net 30 is located in the water filtering cavity 40.
[0044] Combination Figure 3 As shown, the water collecting member 50 is in the shape of a flat long strip, and the length direction of the water collecting member 50 is arranged along the width direction of the supporting guide net 30, and the length of the water collecting member 50 is greater than the width of the first filter membrane 10, the second filter membrane 20 and the supporting guide net 30; the width direction of the water collecting member 50 is consistent with the height direction of the entire flat membrane element, and a water collecting chamber 51 is arranged in the water collecting member 50. The water collecting chamber 51 is a flat groove opened on the water collecting member 50, and the notch of the flat groove faces the water filtering cavity 40 so that the water collecting chamber 51 is connected with the water filtering cavity 40, and the two ends of the flat groove pass through the two ends of the water collecting member 50 to form a built-in water outlet 52, and the water flow in the water collecting chamber 51 can be discharged through the built-in water outlet 52.
[0045] Reference Figure 2 and Figure 3As shown, both sides of each water collecting member 50 have welding lines; the two ends of the first filter membrane 10 and the second filter membrane 20 are respectively welded at the welding lines of the corresponding water collecting member 50, and the two sides of the first filter membrane 10 and the second filter membrane 20 are respectively welded at the sides of the supporting guide net 30, thereby enclosing a relatively closed water filtering cavity 40 for collecting filtered water; the side areas of the entire first filter membrane 10, the second filter membrane 20 and the supporting guide net 30 are relatively large. In order to ensure the stability of the connection between the first filter membrane 10 and the second filter membrane 20 and the supporting guide net 30 and reduce the phenomenon of the first filter membrane 10 and the second filter membrane 20 being impacted and swung by the water flow, a number of welding points 70 welded to the supporting guide net 30 are also distributed on the first filter membrane 10 and the second filter membrane 20, that is, the connection between the first filter membrane 10 and the second filter membrane 20 and the supporting guide net 30 is strengthened by multi-point welding.
[0046] Reference Figure 2 and Figure 3 As shown, the planar thickness of the water collecting member 50 in the present application is 4mm to 6mm, and the material of the water collecting member 50 is ABS; a plurality of bosses 55 are also arranged on the outside of the water collecting member 50, and the plurality of bosses 55 are arranged at intervals along the length direction of the water collecting member 50, and the size of the boss 55 along the thickness direction of the water collecting member 50 is 10mm to 15mm, that is, both sides of the boss 55 protrude from the two side surfaces of the flat body of the water collecting member 50, and a boss 551 is arranged on one side of the boss 55, and a groove 552 is arranged on the other side; when two flexible flat membrane elements are stacked, the boss 551 on the boss 55 in one of the flexible flat membrane elements can be inserted into the groove 552 on the corresponding boss 55 in the other flexible flat membrane element, so that multiple flexible flat membrane elements can be limited and fixed when they are stacked; for example, in the present embodiment, the planar thickness of the water collecting member 50 can be 5mm, and the total thickness including the boss 55 is 12mm.
[0047] Reference Figure 4 As shown, in this embodiment, a flexible flat membrane assembly is also provided, including four membrane shells and a plurality of the above-mentioned flexible flat membrane elements. Each flexible flat membrane assembly can select 5 to 10 flexible flat membrane elements. The flexible flat membrane assembly in this embodiment takes 9 flexible flat membrane elements as an example; the four membrane shells are respectively named as the first membrane shell 60, the second membrane shell 61, the third membrane shell 62 and the fourth membrane shell 63. The 9 flexible flat membrane elements are stacked and combined in layers in sequence; the first membrane shell 60 and the second membrane shell 61 are respectively located at the two ends of one group of water collecting parts 50, and the third membrane shell 62 and the fourth membrane shell 63 are respectively located at the two ends of the other group of water collecting parts 50; Combination Figure 5 and Figure 6As shown, the first membrane shell 60, the second membrane shell 61, the third membrane shell 62 and the fourth membrane shell 63 all include a box body 65 and an end cover 67. One side of the box body 65 has an opening, and the end cover 67 is sealed and fixed on the other side of the box body 65. A partition 66 is arranged in the box body 65, and a connecting cavity 68 is formed between the partition 66 and the end cover 67; a row of snap-in grooves 651 are arranged on the side wall of the box body 65 close to the opening, and the number of the snap-in grooves 651 is the same as the number of flexible flat membrane elements. A row of snap-in holes 661 is arranged on the partition 66, and the number of the snap-in holes 661 is also the same as the number of flexible flat membrane elements. For example, in the present application, the number of flexible flat membrane elements, snap-in grooves 651 and snap-in holes 661 are all 9, and the snap-in grooves 651 and the snap-in holes 661 are evenly spaced along the width direction of the box body 65, and the two ends of one side of the 9 flexible flat membrane elements are respectively snapped into the first membrane shell 60 and the third In the snap-in groove 651 of the membrane shell 62, the other two ends of the other sides of the nine flexible flat membrane elements are respectively snap-into the snap-in grooves 651 of the second membrane shell 61 and the fourth membrane shell 63; the end of the water collecting part 50 in the flexible flat membrane element is snap-into the corresponding snap-in hole 661, and an annular retaining edge 54 is also provided on the outer peripheral surface of the end of the water collecting part 50. When the retaining edge 54 plays a role of limiting and positioning, when the end of the water collecting part 50 is inserted into the corresponding snap-in hole 661, it can be quickly positioned and the stability and reliability of the connection are guaranteed; the built-in water outlet 52 of the water collecting part 50 is connected to the corresponding connecting cavity 68, and a water collecting joint 671 is provided on the first membrane shell 60 and the third membrane shell 62, or a water collecting joint 671 is provided on the second membrane shell 61 and the fourth membrane shell 63. The water collecting joint 671 is connected to the corresponding connecting cavity 68, and the water collecting joint 671 is used to discharge the filtered water in a centralized manner.
[0048] This embodiment also provides a method for manufacturing a flexible flat membrane assembly, which is used to manufacture the above-mentioned flexible flat membrane assembly; the method comprises the following steps: S1. Make the above-mentioned flexible flat membrane element and membrane shell: use a multi-layer woven structure of PE, PP mixed material to weave or weld to form a 3D structure support guide net 30; use a non-woven fabric including main fiber PET and hot-melt bonding fiber as the membrane substrate, use PVDF or PTFE material to make the membrane layer, and the membrane layer and the membrane substrate are bonded to form a filter membrane; both ends of the support guide net 30 are provided with water collection parts 50, and both sides of the support guide net 30 are provided with filter membranes, and both ends of the filter membrane are welded to the side of the water collection part 50, and the height direction edge of the filter membrane is welded all along the line, and the closed element after welding is evenly hot-melt welded to the membrane surface of the filter membrane by 5 to 8 cylinders to form welding points 70, thereby forming a flexible flat membrane element; At least four membrane shells are made of ABS or UPVC. The membrane shells can be injection molded. The membrane shells include a box body 65 and an end cover 67. The box body 65 is in a rectangular cylindrical shape. Both sides of the box body 65 are opened and a partition 66 is arranged in the middle. The opening on one side of the box body 65 is retained. A step 64 for installing the end cover 67 is arranged at the opening on one side of the box body 65. After the end cover 67 is sealed and fixed at the step 64 of the box body 65, a connecting cavity 68 can be formed between the partition 66 and the end cover 67. A side wall of the box body 65 close to the opening is provided. A row of snap-in grooves 651 is provided, and a row of snap-in holes 661 is provided on the partition plate 66. The number of snap-in grooves 651 and snap-in holes 661 is the same as the number of flexible flat membrane elements to be installed. For example, in the present application, the number of flexible flat membrane elements, snap-in grooves 651 and snap-in holes 661 is 9. The distance between adjacent snap-in grooves 651 can be 5 mm, and the distance between adjacent snap-in holes 661 can be 4 mm. The two end covers 67 are provided with water collecting joints 671 connected to the connecting cavity 68; S2, assembling the flexible flat membrane assembly: select 9 flexible flat membrane elements made in step S1 and stack them layer by layer, place four membrane shells at the four corners of the flexible flat membrane elements respectively, and clamp the 9 flexible flat membrane elements in the clamping grooves 651 of the four membrane shells respectively; the ends of the water collecting parts 50 of the flexible flat membrane elements are clamped in the corresponding clamping holes 661 of the four membrane shells respectively; S3, packaging: first, use hot melt adhesive to seal the gaps at the snap-in groove 651 and the snap-in hole 661 in the membrane shell, and then inject AB glue into the membrane shell for packaging. The AB glue is polyurethane or epoxy resin glue; finally, install the end cover 67, and bond and seal it to close the connecting cavity 68, where two end covers 67 with water collection joints 671 are separately installed at the two ends of the flexible flat membrane element.
[0049] Furthermore, in the above step S1 of the present embodiment, the material of the water collecting part 50 is ABS. When the water collecting part 50, the filter membrane and the supporting guide net 30 are assembled, firstly, two filter membranes, a supporting guide net 30 and two water collecting parts 50 are hot-melt welded into a closed component. At this time, the welding temperature is higher than the melting point of ABS, PE and PP, and lower than the melting point of PET; for example, the temperature of the hot melt machine can be adjusted to 175-190°C, the pressure can be 0.4-0.6MPa, and the hot melt welding time can be 10-15S until the whole is closed and formed. The membrane surface welding temperature of the filter membrane is higher than the melting point of PE and lower than the melting point of PP. For example, the welding temperature can be adjusted to 140-160°C, the pressure can be 0.4-0.6MPa, and the hot melt welding time can be 5-6 seconds to complete the welding assembly of the finished membrane element. In this way, according to the material characteristics of each component, the water collecting member 50, the filter membrane and the supporting guide net 30 can be smoothly connected by fusion welding without destroying the supporting strength of the supporting guide net 30, and the stability and reliability of the connection can be ensured.
[0050] The implementation principle is as follows: The flexible flat membrane element in the present application cancels the rigid plate frame flat membrane support of the original traditional flat membrane made of ABS material, and selects a support guide net 30 made of a certain thickness of 3D flexible textile material, so that the thickness of the entire membrane is greatly reduced, and the support guide net 30 with a special structure maintains sufficient flatness of the flat membrane. The flexible flat membrane element in the present application solves the problems of low packing density of existing membrane elements, high production cost, small swing amplitude during aeration in water, and sludge easily adhering to the membrane surface, causing membrane fouling accidents. The flexible flat membrane element in the present application changes the protruding external water outlet structure of the original flat membrane water collecting part 50, so that the built-in water outlet 52 of the water collecting part 50 is an integral built-in structure. During installation, the built-in water outlet 52 is not subjected to force, the strength is greatly increased, and the water outlet efficiency is greatly improved. In the present application, a flat groove is provided as the water collecting chamber 51, which ensures that the overall thickness of the water collecting component 50 is relatively thin and can effectively cover the entire water filtering cavity 40, making the design of the water collecting chamber 51 more reasonable, which is conducive to the smooth flow of water, thereby greatly improving the water collection efficiency.
[0051] The solution in this application reduces the material used in the entire flexible flat membrane assembly, reduces weight, and facilitates transportation and installation. The membrane elements are closely arranged, which greatly improves the packing density of the membrane assembly, which is 40% higher than that of conventional flat membranes. The overall manufacturing cost is only 70% or even lower than that of traditional membrane elements, and the service life is longer.
[0052] In the present application, the specially designed membrane shell structure allows the flexible flat membrane element to be accurately snapped into the membrane shell, ensuring the stability and consistency of the membrane element, reducing installation errors, reducing maintenance costs, and making the overall structure stable and reliable. Furthermore, when multiple flexible flat membrane elements are stacked, the bosses 55 in two adjacent flexible flat membrane elements fit together, so that the spacing between adjacent membrane elements remains stable. For example, the gap can be stably maintained at about 7 mm, avoiding displacement of the membrane element due to water flow impact during operation, thereby reducing friction and wear between membrane elements and increasing the service life of the membrane element. At the same time, this structural design ensures the smooth flow of the aeration channel, prevents the problem of membrane surface blockage caused by excessive closeness between membrane elements, and further enhances the anti-pollution ability of the membrane assembly.
[0053] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A flexible flat membrane element, comprising a first filter membrane (10), a second filter membrane (20), a support guide net (30) and a water collecting member (50), wherein the support guide net (30) is made of a 3D flexible textile material, the first filter membrane (10), the second filter membrane (20) and the support guide net (30) have the same width, the length of the first filter membrane (10) and the second filter membrane (20) is greater than the length of the support guide net (30), a water filtering cavity (40) is formed between the first filter membrane (10) and the second filter membrane (20), and the support guide net (30) is located in the water filtering cavity (40) between the first filter membrane (10) and the second filter membrane (20). 0); a plurality of welding points (70) welded to the supporting guide net (30) are also distributed on the first filter membrane (10) and the second filter membrane (20); the water collecting member (50) is provided at least at one end of the first filter membrane (10), the second filter membrane (20) and the supporting guide net (30); a water collecting cavity (51) is provided in the water collecting member (50), the water collecting cavity (51) is a flat groove opened on the water collecting member (50), the notch of the flat groove faces the water filtering cavity (40) and the water collecting cavity (51) is connected to the water filtering cavity (40), and the two sides of the flat groove penetrate through the two ends of the water collecting member (50) to form the built-in water outlet (52).
2. The flexible flat membrane element according to claim 1, characterized in that: The length direction of the water collecting member (50) is arranged along the width direction of the supporting guide net (30), and the length of the water collecting member (50) is greater than the widths of the first filter membrane (10), the second filter membrane (20) and the supporting guide net (30); the width direction of the water collecting member (50) is consistent with the height direction of the flat membrane element, and the water collecting member (50) is closed at one end away from the water filtering cavity (40) along the width direction, and the water collecting cavity (51) is provided at the other end close to the water filtering cavity (40).
3. The flexible flat membrane element according to claim 2, characterized in that: The water collecting parts (50) are provided at both ends of the first filter membrane (10), the second filter membrane (20) and the supporting guide net (30); both sides of each water collecting part (50) have welding lines; and the two ends of the first filter membrane (10) and the second filter membrane (20) are respectively welded at the corresponding welding lines of the water collecting parts (50).
4. The flexible flat membrane element according to claim 1, 2 or 3, characterized in that: The thickness of the supporting guide net (30) is 1 mm to 3 mm, and its material is a PE and PP mixed material with a multi-layer woven or welded structure.
5. The flexible flat membrane element according to claim 1, 2 or 3, characterized in that: The planar thickness of the water collecting member (50) is 4 mm to 6 mm, and the material of the water collecting member (50) is ABS; the base materials of the first filter membrane (10) and the second filter membrane (20) are both non-woven fabrics including main fiber PET and hot-melt bonding fiber, and the membrane layers of the first filter membrane (10) and the second filter membrane (20) are made of PVDF or PTFE.
6. A flexible flat membrane assembly, characterized in that: The invention comprises a plurality of flexible flat membrane elements as claimed in any one of claims 1 to 5, each of which comprises two water collecting parts (50), and the two water collecting parts (50) are respectively located at the two ends of the first filter membrane (10), the second filter membrane (20) and the supporting guide net (30), and the flexible flat membrane assembly further comprises a first membrane shell (60), a second membrane shell (61), a third membrane shell (62) and a fourth membrane shell (63); the first membrane shell (60) and the second membrane shell (61) are respectively located at the two ends of one of the water collecting parts (50), and the third membrane shell (62) and the fourth membrane shell (63) are respectively located at the two ends of the other water collecting part (50); The first membrane shell (60), the second membrane shell (61), the third membrane shell (62) and the fourth membrane shell (63) are all provided with a plurality of snap-in grooves (651) and a plurality of snap-in holes (661); a plurality of the flexible flat membrane elements are stacked in layers; the plurality of the snap-in grooves (651) and the snap-in holes (661) are arranged in one-to-one correspondence with the flexible flat membrane elements, the flexible flat membrane elements are snap-fitted into the corresponding snap-in grooves (651) and the ends of the water collecting parts (50) in the flexible flat membrane elements are snap-fitted into the corresponding snap-in holes (661); the first membrane shell (60) and the third membrane shell (62) are also provided with water collecting joints (671) which are connected with the built-in water outlets (52) of the corresponding water collecting parts (50).
7. The flexible flat membrane assembly according to claim 6, characterized in that: The first membrane shell (60), the second membrane shell (61), the third membrane shell (62) and the fourth membrane shell (63) all include a box body (65) and an end cover (67). The height direction of the box body (65) is consistent with the height direction of the flexible flat membrane element. The height of the box body (65) is increased by 5-15 mm on the basis of the width of the water collecting member (50) and is used for glue filling and sealing the gap formed after the water collecting member (50) is welded with the first filter membrane (10) and the second filter membrane (20). One side of the box body (65) has an opening, and the end cover (67) is sealingly fixed to the box body ( On the other side of the box body (65), a partition (66) is provided in the box body (65) and a connecting cavity (68) is formed between the partition (66) and the end cover (67); the snap-in grooves (651) are arranged in rows on the side wall of the box body (65) close to the opening; the snap-in holes (661) are arranged in rows on the partition (66); the built-in water outlet (52) of the water collecting component (50) is connected to the corresponding connecting cavity (68), and the water collecting joints (671) on the first membrane shell (60) and the third membrane shell (62) are connected to the corresponding connecting cavity (68).
8. The flexible flat membrane assembly according to claim 6 or 7, characterized in that: A plurality of bosses (55) are arranged at intervals on the outer side of the water collecting member (50) along the length direction of the water collecting member (50); a boss (551) is arranged on one side of the boss (55) and a groove (552) is arranged on the other side; in two adjacent flexible flat membrane elements, the boss (551) on the boss (55) in one of the flexible flat membrane elements can be inserted into the groove (552) on the corresponding boss (55) in the other flexible flat membrane element.
9. A method for manufacturing a flexible flat membrane assembly, used for manufacturing the flexible flat membrane assembly as claimed in any one of claims 6 to 8; characterized in that: The following steps are involved: S1. Manufacturing a flexible flat membrane element: Weaving or welding a 3D structure support guide net (30) with a multi-layer woven structure of PE and PP mixed materials; using a non-woven fabric including main fiber PET and hot-melt bonding fiber as a membrane substrate, using PVDF or PTFE material to manufacture a membrane layer, and bonding the membrane layer and the membrane substrate to form a filter membrane; water collection parts (50) are arranged at both ends of the support guide net (30), and filter membranes are arranged on both sides of the support guide net (30), and the two ends of the filter membrane are welded to the side of the water collection part (50), and the edge of the filter membrane in the height direction is welded all along the line, and the closed element formed after welding is evenly hot-melt welded to the membrane surface of the filter membrane by 5 to 8 cylinders to form welding points (70); thereby forming a flexible flat membrane element; S2, assembling the flexible flat membrane assembly: selecting a number of flexible flat membrane elements produced in step S1 and stacking them layer by layer, placing four membrane shells at the four corners of the flexible flat membrane elements respectively, and clamping the several flexible flat membrane elements in the clamping grooves (651) of the four membrane shells respectively; and clamping the ends of the water collecting parts (50) of the flexible flat membrane elements in the corresponding clamping holes (661) of the four membrane shells respectively; S3. Packaging: The four membrane shells are filled with glue for packaging.
10. The method for manufacturing a flexible flat membrane assembly according to claim 9, characterized in that: In step S1, the material of the water collecting member (50) is ABS. When the water collecting member (50), the filter membrane and the supporting guide net (30) are assembled, firstly, two filter membranes, one supporting guide net (30) and two water collecting members (50) are hot-melt welded into a closed component. At this time, the welding temperature is higher than the melting point of ABS, PE and PP, and lower than the melting point of PET. The welding temperature of the membrane surface of the filter membrane is higher than the melting point of PE and lower than the melting point of PP.