Spiral-wound membrane element and spiral-wound membrane water purification equipment
By incorporating radial support rods and water collection pipes into the spiral wound membrane element, the problems of poor fluid flow and structural instability were solved, achieving highly efficient water treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-04-07
AI Technical Summary
Spiral wound membrane elements exhibit problems such as poor clear liquid flow under high pressure differential, "telescope phenomenon" caused by thinning of the membrane bag and concentrate separator, and concentrate separator being flushed out of the membrane cartridge.
Support rods are fixed radially at both ends of the membrane tube, and clear liquid guide channels are set on the surface of the water collection pipe, including spiral, axial and circumferential guide channels. Combined with radial and axial fixing structures, the stability of the membrane tube and the flowability of the clear liquid are ensured.
It improves the structural stability of membrane elements, reduces energy consumption, prevents the "telescope phenomenon" and the flushing out of the concentrate screen, and enhances the flowability and treatment efficiency of the clarified liquid.
Smart Images
Figure CN224086451U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of water treatment, and more specifically, to spiral wound membrane elements and spiral wound membrane water purification equipment. Background Technology
[0002] Spiral wound membrane water purification equipment is widely used in water treatment processes across various fields. Its core component is a cylindrical spiral wound membrane element. Traditional spiral wound membrane elements typically include a membrane bag, a concentrate separator, a collection pipe, and end caps. The membrane bag contains a clarifying separator. Multiple membrane bags and concentrate separators are wound around the collection pipe, and two end caps are used to secure the membrane tube at both ends. Finally, a fiberglass shell is wrapped around the membrane tube to form the spiral wound membrane element. Newer spiral wound membrane elements can form a sealed clarifying drainage channel through self-locking end caps, thus eliminating the need for a collection pipe.
[0003] Currently, the following problems have arisen during the operation of spiral wound membrane elements under high pressure differential:
[0004] First, besides supporting the membrane tube formed by the membrane bag and concentrate separator, the collection pipe also needs to have through holes in its wall to allow the clarified liquid produced by the membrane bag filtration to flow through these holes into the collection pipe and be discharged. However, the number of through holes on the collection pipe is limited, and the clarified liquid must flow a certain distance along the surface of the collection pipe before reaching the through holes. When the membrane bag is under high pressure, the gap between the membrane bag and the collection pipe becomes smaller, resulting in poor flow of the clarified liquid on the surface of the collection pipe. This often requires a large driving force to flow to the through holes, thus significantly increasing energy consumption.
[0005] Secondly, both the membrane bag and the concentrate separator will be thinned to varying degrees by water pressure during use, especially under high operating pressure conditions. When both the membrane bag and the concentrate separator are thinned, they are essentially separated. When the feed flow rate is high or the membrane is severely fouled, this can cause the spiral wound membrane element to exhibit a "telescope effect" (meaning misalignment between membrane bags, resulting in a shape resembling a telescope with one end concave and the other protruding) or the concentrate separator to be ejected from the membrane cartridge. Simultaneously, the end face of the membrane bag will concave inward under high water pressure, causing wrinkles inside the membrane bag. This phenomenon frequently occurs in actual use. Utility Model Content
[0006] Firstly, the purpose of this utility model is to provide a spiral wound membrane element and its preparation method to solve the technical problems in the prior art, such as the "telescope phenomenon" in spiral wound membrane elements, the concentrated water separator flowing out of the membrane tube, and the severe concavity at both ends of the membrane bag.
[0007] To achieve the aforementioned first objective, the technical solution provided by this utility model is as follows:
[0008] A spiral wound membrane element includes a membrane tube formed by winding a membrane bag; it also includes a radial fixing structure that fixes the membrane tube radially at both axial ends.
[0009] As a further improvement to the spiral wound membrane element described in the first aspect above: the radial fixing structure includes a support rod embedded radially along the membrane tube.
[0010] As a further improvement to the spiral wound membrane element described in the first aspect above: the support rod comprises metal rods uniformly distributed circumferentially along the membrane cylinder.
[0011] As a further improvement to the spiral wound membrane element described in the first aspect above: the metal rod is a steel nail with a diameter of 0.2 to 1.5 cm.
[0012] As a further improvement to the spiral wound membrane element described in the first aspect above: the support rod extends radially out of the outer surface of the membrane tube by 2 to 6 mm.
[0013] As a further improvement to the spiral wound membrane element described in the first aspect above: the membrane bag is formed by bonding two overlapping membrane sheets, forming a clear liquid cavity between the two membrane sheets, and a clear liquid separator is provided in the clear liquid cavity; the bonding points of the membrane sheets form sealing sections at both ends of the membrane tube after the membrane bag is wound, and the clear liquid separator forms a sealing part located inside the sealing section after the membrane bag is wound; the support rod is provided inside the sealing section or at the outer end of the sealing section, and the inner end of the support rod is inserted into the sealing part.
[0014] As a further improvement to the spiral wound membrane element described in the first aspect above: when no water collection pipe is provided inside the membrane tube, the support rod extends radially into the sealing part, and the distance between the inner end of the support rod and the inner surface of the sealing part is 1 to 2.5 mm; when a water collection pipe is provided inside the membrane tube, the support rod extends radially into the membrane tube, passes through the sealing part, and extends into the water collection pipe, and the distance between the inner end of the support rod and the inner surface of the water collection pipe is 2.5 to 5 mm.
[0015] The method for preparing the spiral wound membrane element described in the first aspect above includes the following steps:
[0016] The axial ends of the membrane tube formed by winding the membrane bag are fixed, and then holes are drilled radially along both ends of the membrane tube.
[0017] By embedding a radial fixing structure into the drill hole, a spiral wound membrane element is obtained.
[0018] In the first type of spiral wound membrane element mentioned above, by applying a radial fixing structure at both ends of the membrane tube, the anti-misalignment performance of the membrane tube is significantly improved. Even under high influent flow rate, the structure can maintain long-term stability and is less prone to technical problems such as "telescope phenomenon", concentrated water screen being flushed out of the membrane tube, and severe dents at both ends of the membrane bag. This ensures high treatment efficiency over a long period of time.
[0019] Secondly, the purpose of this utility model is to provide spiral wound membrane elements and spiral wound membrane water purification equipment to solve the technical problem of poor fluidity of the clear liquid on the surface of the water collection pipe in the prior art.
[0020] To achieve the second objective mentioned above, the technical solution provided by this utility model is as follows:
[0021] A spiral wound membrane element includes a membrane tube formed by winding a membrane bag and a water collection pipe for discharging the clarified liquid filtered by the membrane bag; the open edge of the membrane bag is connected to the water collection pipe, and the water collection pipe is provided with a through hole communicating with the open edge of the membrane bag; the surface of the water collection pipe is also provided with a clarified liquid guiding channel, the clarified liquid guiding channel including at least one of a spiral guiding channel, an axial guiding channel and an circumferential guiding channel; the through hole is provided on the clarified liquid guiding channel.
[0022] As a further improvement to the spiral membrane element described in the second aspect above: the spiral guide channel is in the shape of a cylindrical helix; there are multiple axial guide channels arranged in parallel at equal intervals along the circumference of the water collection pipe; there are multiple circumferential guide channels arranged in parallel at equal intervals along the axial direction of the water collection pipe.
[0023] As a further improvement to the spiral wound membrane element described in the second aspect above: the clear liquid guiding channel is composed of a spiral guiding channel and an axial guiding channel; or, the clear liquid guiding channel is composed of an axial guiding channel and an circumferential guiding channel.
[0024] As a further improvement to the spiral wound membrane element described in the second aspect above: the through hole is provided on a spiral or circumferential flow channel between two adjacent axial flow channels.
[0025] As a further improvement to the spiral wound membrane element described in the second aspect above: the cross-sectional width of the clear liquid guiding channel is 1-8 mm and the depth is 1-5 mm.
[0026] As a further improvement to the spiral wound membrane element described in the second aspect above: the membrane bag is formed by winding at least two membrane bags, with a concentrate separator provided between two adjacent membrane bags.
[0027] As a further improvement to the spiral wound membrane element described in the second aspect above, it also includes an axial fixing structure for fixing the two ends of the membrane tube in the axial direction. The axial fixing structure includes end caps. After the membrane bag is wound into a membrane tube along the circumference of the water collection pipe, it is fixed at both ends of the water collection pipe by end caps.
[0028] As a further improvement to the spiral wound membrane element described in the second aspect above: both ends of the water collection pipe are threadedly connected to end caps.
[0029] In the second type of spiral membrane element mentioned above, by opening a clear liquid flow channel on the surface of the water collection pipe that communicates with the through hole, the flowability of the clear liquid on the water collection pipe is significantly improved. In particular, when the clear liquid flow channel is composed of a spiral flow channel and an axial flow channel, the flow path of the clear liquid is rich and it can flow quickly to the through hole. Even under high pressure, there is no need to apply a high driving force, so energy consumption can be significantly reduced.
[0030] Thirdly, the purpose of this utility model is to provide spiral wound membrane elements and spiral wound membrane water purification equipment to solve the technical problems in the prior art, such as poor fluidity of the clarified liquid on the surface of the water collection pipe, "telescope phenomenon" of spiral wound membrane elements, concentrated water screen rushing out of the membrane tube, and severe dents at both ends of the membrane bag.
[0031] To achieve the aforementioned third objective, the technical solution provided by this utility model is as follows:
[0032] A spiral wound membrane element includes a membrane tube formed by winding a membrane bag, and further includes: a water collection pipe for discharging the clarified liquid filtered by the membrane bag; the open edge of the membrane bag is connected to the water collection pipe, and the wall of the water collection pipe is provided with a through hole communicating with the open edge of the membrane bag; the water collection pipe is provided with a clarified liquid guiding channel; a radial fixing structure is provided at both ends of the membrane tube and fixed radially along the membrane tube; an axial fixing structure is used to fix both ends of the membrane tube axially; the axial fixing structure includes end caps, and the membrane bag is wound into a membrane tube circumferentially along the water collection pipe and then fixed at both ends of the water collection pipe by end caps.
[0033] As a further improvement to the spiral wound membrane element described in the third aspect above: the radial fixing structure includes a support rod embedded radially along the membrane tube.
[0034] As a further improvement to the spiral wound membrane element described in the third aspect above: the support rod comprises metal rods uniformly distributed circumferentially along the membrane tube; the metal rods are steel nails with a diameter of 0.2 to 1.5 cm.
[0035] As a further improvement to the spiral wound membrane element described in the third aspect above: the support rod extends radially out of the outer surface of the membrane tube by 2 to 6 mm.
[0036] As a further improvement to the spiral wound membrane element described in the third aspect above: the membrane bag is formed by bonding two overlapping membrane sheets, forming a clear liquid cavity between the two membrane sheets, and a clear liquid separator is provided in the clear liquid cavity; the bonding points of the membrane sheets form sealing sections at both ends of the membrane tube after the membrane bag is wound, and the clear liquid separator forms a sealing part located inside the sealing section after the membrane bag is wound; the support rod is provided inside the sealing section or at the outer end of the sealing section, and the inner end of the support rod is inserted into the sealing part.
[0037] As a further improvement to the spiral wound membrane element described in the third aspect above: when no water collection pipe is provided inside the membrane tube, the support rod extends radially into the sealing part, and the distance between the inner end of the support rod and the inner surface of the sealing part is 1 to 2.5 mm; when a water collection pipe is provided inside the membrane tube, the support rod extends radially into the membrane tube, passes through the sealing part, and extends into the water collection pipe, and the distance between the inner end of the support rod and the inner surface of the water collection pipe is 2.5 to 5 mm.
[0038] As a further improvement to the spiral wound membrane element described in the third aspect above: both ends of the water collection pipe are threadedly connected to end caps.
[0039] As a further improvement to the spiral wound membrane element described in the third aspect above: the clear liquid guiding channel includes at least one of a spiral guiding channel, an axial guiding channel, and an circumferential guiding channel; the through hole is provided on the clear liquid guiding channel.
[0040] As a further improvement to the spiral wound membrane element described in the third aspect above: the clear liquid guiding channel is composed of a spiral guiding channel and an axial guiding channel; or, the clear liquid guiding channel is composed of an axial guiding channel and an circumferential guiding channel.
[0041] The third type of spiral wound membrane element mentioned above combines the advantages of the two types of spiral wound membrane elements mentioned above. It can ensure high long-term structural stability and treatment efficiency through the radial fixing structure at both ends of the membrane tube, and reduce the flow resistance of the clear liquid through the clear liquid guiding channel on the water collection pipe, thereby reducing energy consumption.
[0042] Fourthly, the purpose of this utility model is to provide a simple and easy-to-operate processing fixture for spiral wound membrane elements to process the spiral wound membrane elements described in the first aspect above. The technical solution is as follows:
[0043] A processing fixture for a spiral wound membrane element, the spiral wound membrane element comprising a membrane tube wound from a membrane bag, the processing fixture comprising: a fixing part for fixing the axial ends of the membrane tube; a drilling part for drilling a radial hole at the fixed end of the membrane tube along the membrane tube; the drilling part comprising a drill bit and a first motor; a jacking part for jacking a support rod into the drill hole; the jacking part having a radial telescopic rod adapted to the size of the support rod; and a rotating part for driving the membrane tube to rotate.
[0044] As a further improvement to the processing fixture for the spiral wound membrane element described in the fourth aspect above: the fixing part includes support seats at both ends of the membrane tube, an axial telescopic rod at one end of the membrane tube, and an axial cylinder for driving the axial telescopic rod to extend and retract.
[0045] As a further improvement to the processing fixture for the spiral wound film element described in the fourth aspect above: the drilling section further includes a lifting mechanism disposed on the support base and a support frame disposed on the lifting mechanism, the first motor is disposed on the support frame, and the drilling hole is disposed downward.
[0046] As a further improvement to the processing fixture for the spiral wound film element described in the fourth aspect above: the lifting mechanism is a screw lifting mechanism.
[0047] As a further improvement to the processing fixture for the spiral wound membrane element described in the fourth aspect above: the jacking part further includes a radial cylinder located on the side of the support seat for driving the extension and retraction of the radial telescopic rod.
[0048] As a further improvement to the processing fixture for the spiral wound membrane element described in the fourth aspect above: the rotating part includes a rotating wheel disposed on both sides of the membrane cylinder along the axial direction and a second motor for driving the rotating wheel to rotate, the rotating wheel being fixed between the support bases.
[0049] As a further improvement to the processing fixture for the spiral wound membrane element described in the fourth aspect above: the processing fixture further includes a clamping part for clamping the support rod, the clamping part including a jaw disposed above the push-in part.
[0050] The aforementioned machining fixture for spiral wound membrane elements has a simple structure and is easy to operate. It can significantly improve the machining efficiency and quality of radially fixed structures, and help radially fixed structures achieve efficient shape retention.
[0051] Fifthly, the purpose of this utility model is to provide a spiral wound membrane water purification device and a water treatment method using the above-mentioned spiral wound membrane element, the technical solution of which is as follows:
[0052] Spiral membrane water purification equipment, including any of the spiral membrane elements mentioned above.
[0053] The water treatment method uses any of the spiral wound membrane elements described above to filter the water to be treated, or uses the spiral wound membrane water purification equipment described above to filter the water to be treated.
[0054] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. Attached Figure Description
[0055] The accompanying drawings, which form part of this utility model, are used to aid in understanding this utility model. The contents provided in the drawings and their related descriptions in this utility model can be used to explain this utility model, but do not constitute an improper limitation of this utility model.
[0056] In the attached diagram:
[0057] Figure 1 This is a schematic diagram of the unfolded state of the spiral wound membrane element of this utility model.
[0058] Figure 2 This is a schematic diagram of the structure of a single membrane bag in the spiral wound membrane element of this utility model.
[0059] Figure 3 This is a front view of the spiral wound membrane element of this utility model.
[0060] Figure 4 for Figure 3 A sectional view along the AA direction.
[0061] Figure 5 for Figure 3 A cross-sectional view along the BB direction.
[0062] Figure 6 for Figure 3 Another sectional view of the BB direction.
[0063] Figure 7 This is a schematic diagram of the processing tooling used for the spiral wound membrane element of this utility model.
[0064] Figure 8 This is a schematic diagram of a water collection pipe in the spiral wound membrane element of this utility model.
[0065] Figure 9 This is a schematic diagram of another structure of the water collection pipe 200 in the spiral wound membrane element of this utility model.
[0066] The relevant markings in the above figures are:
[0067] 100-Membrane tube, 110-Membrane bag, 111-Membrane sheet, 1110-Adhesive layer, 112-Clearing liquid separator, 113-Clearing liquid chamber, 120-Concentrate separator, 130-Sealing section, 140-Sealing part, 150-Clearing liquid flow channel, 200-Water collection pipe, 210-Through hole, 220-Spiral guide channel, 230-Axial guide channel, 240-External thread, 250-Circumferential guide channel, 300-End cap, 400-Outer shell, 500-Support rod, 611-Support base, 612-Axial telescopic rod, 613-Axial cylinder, 621-Drill bit, 622-First motor, 623-Lifting mechanism, 624-Support frame, 631-Radial telescopic rod, 632-Radial cylinder, 641-Rotator, 642-Second motor, 650-Gripper. Detailed Implementation
[0068] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:
[0069] The technical solutions and features provided in the various parts of this utility model, including the following description, can be combined with each other without conflict.
[0070] Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the protection scope of the present invention.
[0071] Regarding the terminology and units used in this utility model: The terms "comprising," "having," and any variations thereof in the specification, claims, and related parts of this utility model are intended to cover non-exclusive inclusion.
[0072] Figure 1 This is a schematic diagram of the unfolded state of the spiral wound membrane element of this utility model.
[0073] like Figure 1 As shown, the membrane tube 100 is formed by winding multiple sets of membrane bags 110 and concentrate separators 120 arranged at intervals. One winding method is to wind the membrane bags 110 with the open end as support, and the other method is to wind the membrane bags 110 along the outer wall of the water collection pipe 200. Both winding methods use the open end of the membrane bag 110 as the starting end of the winding.
[0074] The membrane bag 110 is formed by bonding two overlapping membrane sheets 111, and a clear liquid cavity 113 is formed between the two membrane sheets 111. A clear liquid separator 112 is provided in the clear liquid cavity 113. The membrane sheet 111 is a nanofiltration membrane or a reverse osmosis membrane.
[0075] The inner side of the membrane tube 100 is formed by multiple layers of clear liquid separators 112 to form a circular clear liquid flow channel 150. The multiple layers of clear liquid separators 112 at both ends of the clear liquid flow channel 150 are fixed and sealed with glue. The clear liquid flow channel 150 can provide support for the membrane tube 100 on the one hand, and can improve the flow of clear liquid on the surface of the water collection pipe 200 when the water collection pipe 200 is installed, thereby promoting the rapid flow of clear liquid into the water collection pipe 200.
[0076] The water to be treated flows between adjacent membrane bags 110 under the guidance of the concentrate separator 120. Due to the physical interception of the membrane sheet 111, the clarified liquid (or pure water) passes through the membrane sheet 111 and enters the interior of the membrane bag 110. Then, under the guidance of the clarified liquid separator 112, it is concentrated in the middle of the membrane cylinder 100 and discharged. When the membrane bag 110 is wound along the outer wall of the water collecting pipe 200 to form the membrane cylinder 100, the clarified liquid flows into the interior of the water collecting pipe 200 through the through hole 210 opened on the pipe wall and is discharged.
[0077] Figure 2 This is a schematic diagram of the structure of a single membrane bag in the spiral wound membrane element of this utility model.
[0078] like Figure 2 As shown, the membrane bag 110 is bag-shaped and generally rectangular. Except for the open end, the remaining sides are adhesive layers 1110 that bond the edges of overlapping membrane sheets 111. The adhesive layers 1110, running radially along the membrane tube 100, form sealing sections 130 at both ends of the membrane tube 100 after winding. The multi-layered clear liquid separators 112 located at both ends of the clear liquid flow channel 150 are fixed with adhesive to form sealing portions 140 located inside the sealing sections 130. In another embodiment, the outer side of the adhesive layer 1110 also has a small number of incompletely bonded membrane sheets 111.
[0079] Figure 3 This is a front view of the spiral wound membrane element of this utility model. Figure 4 for Figure 3 A sectional view along the AA direction. Figure 5 for Figure 3 A cross-sectional view along the BB direction. Figure 6 for Figure 3 Another sectional view of the BB direction.
[0080] The first embodiment of the spiral wound membrane element of this utility model is as follows: Figure 3-6 As shown, the spiral wound membrane element includes a membrane roll 100 formed by winding a membrane bag 110 and a concentrate separator 120 (unwound as shown). Figure 1 (as shown) and a radial fixing structure that fixes the membrane cylinder 100 radially at both axial ends. The radial fixing structure includes support rods 500 embedded radially along the membrane cylinder 100, the support rods 500 being 10 metal rods evenly distributed circumferentially along the membrane cylinder 100.
[0081] A preferred embodiment of the metal rod is to use steel nails with a diameter of 0.2 to 1.5 cm, which provides good fixation and minimizes disturbance to the overall stability of the membrane element structure.
[0082] The steel nail extends radially out of the outer surface of the membrane tube 100 by 2-6 mm. The part extending out of the membrane tube 100 can be shaped and flattened when encapsulated with a fiberglass shell, thereby ensuring a better fixing effect.
[0083] like Figure 5 As shown, when a water collection pipe is provided inside the membrane cylinder 100, the support rod 500 extends radially along the membrane cylinder 100, passing through the sealing part 140 and extending into the water collection pipe 200. The distance between the inner end of the support rod 500 and the inner surface of the water collection pipe 200 is 2.5–5 mm (i.e., it does not penetrate the water collection pipe 200). Figure 6 As shown, when no water collection pipe is installed inside the membrane tube 100, the support rod 500 extends radially into the sealing part 140, and the distance between the inner end of the support rod 500 and the inner surface of the sealing part 140 is 1-2.5 mm (i.e., without penetrating the sealing part 140). Both of these methods require the inner end of the support rod 500 to be inserted into the sealing part 140, thus ensuring not only good fixation but also the flow and sealing of the clarified liquid and concentrated water.
[0084] The radial fixing structure and the clear liquid chamber 113 should be independent of each other. Therefore, the radial fixing structure is located inside the sealing section 130 or at the outer end of the sealing section 130 (the figure shows that the radial fixing structure is located inside the sealing section 130). Thus, it will not affect the filtration process or the flow and sealing of the clear liquid and concentrated water.
[0085] The method for preparing the spiral wound membrane element in this embodiment includes the following steps:
[0086] The membrane tube 100 formed by winding the membrane bag 110 is fixed at both ends, and then holes are drilled radially at both ends of the membrane tube 100.
[0087] Inserting the support rod 500 into the drilled hole yields the spiral wound membrane element.
[0088] Figure 7 This is a schematic diagram of the processing tooling used for the spiral wound membrane element of this utility model.
[0089] like Figure 7As shown, the machining fixture used in the fabrication method of the spiral wound membrane element in this embodiment includes a fixing part, a drilling part, an jacking part, a rotating part, and a clamping part. The fixing part is used to fix both ends of the membrane cylinder 100 along its axial direction. The drilling part is used to drill holes radially along the ends of the fixed membrane cylinder 100. The jacking part is used to push the support rod 500 into the drilled holes. The rotating part is used to drive the membrane cylinder 100 to rotate. The clamping part is used to clamp the support rod 500.
[0090] The fixing part includes support seats 611 at both ends of the membrane cylinder 100, an axial telescopic rod 612 at one end of the membrane cylinder 100, and an axial cylinder 613 for driving the axial telescopic rod 612 to extend and retract.
[0091] The drilling section includes a drill bit 621, a first motor 622, a lifting mechanism 623 mounted on a support base 611, and a support frame 624 mounted on the lifting mechanism 623. The first motor 622 is mounted on the support frame 624. The drill hole is set downwards. The lifting mechanism 623 is a screw lifting mechanism 623.
[0092] The jacking section has a radial telescopic rod 631 that is adapted to the size of the support rod 500, and a radial cylinder 632 located on the side of the support seat 611 for driving the extension and retraction of the radial telescopic rod 631.
[0093] The rotating part includes a rotating wheel 641 disposed on both sides of the membrane cylinder 100 along the axial direction and a second motor 642 for driving the rotating wheel 641 to rotate. The rotating wheel 641 is fixed between the support bases 611.
[0094] The clamping part includes a jaw 650 located above the top part for clamping the support rod 500.
[0095] In specific operation, firstly, the membrane cylinder 100 is placed on two rotating wheels 641. The axial telescopic rod 612 is extended and retracted by the axial cylinder 613, thereby fixing the membrane cylinder 100 between the support base 611 and the axial telescopic rod 612. Then, the lifting mechanism 623 drives the first motor 622 and the drill bit 621 to move downwards. When the drill bit 621 drills to the required depth at the end of the membrane cylinder 100, the lifting mechanism 623 drives the first motor 622 and the drill bit 621 to move upwards. Next, the membrane cylinder 100 is rotated a certain angle by the rotating wheels 641, and the support rod 500, held by the clamping jaws 650, is placed into the pre-drilled hole by the clamping part. Then, the membrane cylinder 100 is rotated a certain angle again by the rotating wheels 641, and the radial telescopic rod 631 is extended and retracted by the radial cylinder 632, thereby completely embedding the support rod 500 into the drilled hole. Repeat the above operation. After the 10 support rods 500 are inlaid at one end of the membrane tube 100, turn the membrane tube 100 around and then install the support rods 500 at the other end of the membrane tube 100, thus completing the installation of the radial fixing structure.
[0096] Figure 8 This is a schematic diagram of the water collection pipe 200 in the spiral wound membrane element of this utility model. Figure 9 This is a schematic diagram of another structure of the water collection pipe 200 in the spiral wound membrane element of this utility model.
[0097] The second embodiment of the spiral wound membrane element of this utility model is as follows: Figure 3-6 As shown in Figures 8-9, based on the first embodiment, the spiral wound membrane element further includes a water collection pipe 200 for discharging the clear liquid filtered by the membrane bag 110; the open edge of the membrane bag 110 is connected to the water collection pipe 200, and the water collection pipe 200 is provided with a through hole 210 communicating with the open edge of the membrane bag 110; the surface of the water collection pipe 200 is also provided with a clear liquid guiding channel, and the clear liquid guiding channel includes at least one of a spiral guiding channel 220, an axial guiding channel 230, and an circumferential guiding channel 250.
[0098] The spiral guide channel 220 is in the shape of a cylindrical spiral. There are multiple axial guide channels 230 arranged in parallel at equal intervals along the circumference of the water collection pipe 200. There are multiple circumferential guide channels 250 arranged in parallel at equal intervals along the axial direction of the water collection pipe 200. As a result, the flow path of the clear liquid is more abundant and the flow resistance is smaller.
[0099] Preferably, such as Figure 8 As shown, the clear liquid guiding channel is composed of a spiral guiding channel 220 and an axial guiding channel 230, or, as... Figure 9 As shown, the clear liquid guiding channel is composed of an axial guiding channel 230 and an circumferential guiding channel 250, thereby enriching the flow path of the clear liquid and reducing the flow resistance.
[0100] The through hole 210 is provided on the spiral guide channel 220 or the circumferential guide channel 250 between two adjacent axial guide channels 230, thereby facilitating the rapid flow of the clear liquid into the through hole 210.
[0101] The cross-sectional width of the clear liquid guiding channel is 1-8 mm and the depth is 1-5 mm. This ensures good fresh water flow while allowing the water collection pipe 200 to retain high strength to support the membrane cylinder 100.
[0102] The third embodiment of the spiral wound membrane element of this utility model is as follows: Figure 3-4 As shown, based on the second embodiment, the spiral membrane element further includes an axial fixing structure for fixing the two ends of the membrane tube 100. The axial fixing structure includes end caps 300. After the membrane bag 110 is wound around the water collection pipe 200 to form the membrane tube 100, the two ends of the water collection pipe 200 are fixed by end caps 300.
[0103] The traditional connection method between the water collection pipe 200 and the end cap 300 is adhesive bonding, which has poor bonding strength and the adhesive is prone to failure during long-term immersion. In this embodiment, the water collection pipe 200 has external threads 240 at both ends, and the end cap 300 has external threads 240 at its central hole. This allows the water collection pipe 200 and the end cap 300 to be threadedly connected. Compared with the traditional adhesive bonding method, the threaded connection can significantly improve the connection strength between the water collection pipe 200 and the end cap 300, thereby improving the structural stability of the membrane element.
[0104] The fourth embodiment of the spiral wound membrane element of this utility model is as follows: Figure 3-6 As shown in Figures 8-9, the spiral wound membrane element includes the membrane tube 100, the radial fixing structure, the water collection pipe 200, and the axial fixing structure described above.
[0105] The following experimental data illustrates the beneficial effects of the spiral wound membrane element of this invention.
[0106] First, the deformation degree of conventional spiral wound membrane elements and the spiral wound membrane element of this embodiment was tested under different feed water flow rates. The feed water flow rates were set to 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26 m³. 3 The inlet water pressure is 120 bar, and the concentration of the liquid to be treated (NaCl solution) is set to 200,000 mg / L.
[0107] It has been verified that the membrane roll of a conventional spiral wound membrane element (100) can only be ≤12m. 3 No deformation occurs at an influent flow rate of 100 m³ / h, but as the influent flow rate increases, the membrane cylinder 100 gradually deforms, especially when the influent flow rate reaches 20 m³ / h. 3 When the flow rate exceeds 26m / h, the membrane roll 100 undergoes severe deformation, producing a very noticeable "telescope phenomenon." However, the spiral wound membrane element of this embodiment, even when subjected to prolonged conditions of 26m / h, exhibits excellent performance. 3 It operated at an influent flow rate of / h without any deformation.
[0108] Then, the permeate flow rates of conventional spiral wound membrane elements and the spiral wound membrane elements of this embodiment were tested under different operating conditions. The inlet pressures for the three operating conditions were set to 55, 90, and 120 bar, respectively, and the concentrations of the liquid to be treated (NaCl solution) were set to 32,000, 70,000, and 100,000 mg / L, respectively.
[0109] Verification showed that, under three operating conditions, the permeate flow rates of conventional spiral wound membrane elements were 1.14, 0.82, and 0.65 m³, respectively. 3 / h, while the water production rates of the spiral wound membrane element in this embodiment are 1.21, 1.08, and 0.95m³, respectively. 3 / h, as can be seen from the comparison, the spiral wound membrane element of this embodiment has a higher water production rate under all three operating conditions, indicating that the clear liquid has better flowability on the water collection pipe 200.
[0110] The embodiments of the spiral wound membrane water purification equipment of this utility model include the spiral wound membrane element described in any of the above embodiments.
[0111] The embodiment of the water treatment method of this utility model is to filter the water to be treated by using the spiral wound membrane element described in any of the above embodiments, or to filter the water to be treated by using the spiral wound membrane water purification equipment described above.
[0112] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model based on these descriptions. All other embodiments obtained by those skilled in the art based on the above description of this utility model without inventive effort should fall within the protection scope of this utility model.
Claims
1. A spiral wound membrane element, comprising a membrane roll (100) formed by winding a membrane bag (110), characterized in that: Also includes: The water collection pipe (200) is used to discharge the clear liquid filtered through the membrane bag (110); The opening edge of the membrane bag (110) is connected to the water collection pipe (200), and the water collection pipe (200) has a through hole (210) on its wall that communicates with the opening edge of the membrane bag (110); the water collection pipe (200) is provided with a clear liquid guiding channel; A radial fixing structure is provided at both ends of the membrane tube (100) in the axial direction and fixed radially along the membrane tube (100); An axial fixing structure is used to fix the two ends of the membrane tube (100) in the axial direction; the axial fixing structure includes end caps (300), and the membrane bag (110) is wound into a membrane tube (100) circumferentially along the water collection pipe (200) and then fixed at both ends of the water collection pipe (200) by end caps (300).
2. The spiral wound membrane element as described in claim 1, characterized in that: The radial fixing structure includes a support rod (500) radially embedded along the membrane tube (100).
3. The spiral wound membrane element as described in claim 2, characterized in that: The support rod (500) includes metal rods evenly distributed circumferentially along the membrane tube (100); the metal rods are steel nails with a diameter of 0.2 to 1.5 cm.
4. The spiral wound membrane element as described in claim 3, characterized in that: The support rod (500) extends radially out of the outer surface of the membrane tube (100) by 2-6 mm.
5. The spiral wound membrane element as described in claim 2, characterized in that: The membrane bag (110) is formed by bonding two overlapping membrane sheets (111), and a clear liquid cavity (113) is formed between the two membrane sheets (111). A clear liquid separator (112) is provided in the clear liquid cavity (113). The adhesive joint of the membrane (111) forms a sealing section (130) at both ends of the membrane tube (100) after the membrane bag (110) is wound. The clear liquid separator (112) forms a sealing part (140) inside the sealing section (130) after the membrane bag (110) is wound. The support rod (500) is located inside the sealing section (130) or at the outer end of the sealing section (130), and the inner end of the support rod (500) is inserted into the sealing part (140).
6. The spiral wound membrane element as described in claim 5, characterized in that: When no water collection pipe is installed inside the membrane tube (100), the support rod (500) extends radially into the sealing part (140) along the membrane tube (100), and the distance between the inner end of the support rod (500) and the inner surface of the sealing part (140) is 1 to 2.5 mm. When a water collection pipe is provided inside the membrane tube (100), the support rod (500) extends radially along the membrane tube (100) to pass through the sealing part (140) and extends into the water collection pipe (200). The distance between the inner end of the support rod (500) and the inner surface of the water collection pipe (200) is 2.5 to 5 mm.
7. The spiral wound membrane element as described in claim 1, characterized in that: The two ends of the water collection pipe (200) are threadedly connected to the end cap (300).
8. The spiral wound membrane element as described in claim 1, characterized in that: The clear liquid guiding channel includes at least one of a spiral guiding channel (220), an axial guiding channel (230), and an annular guiding channel (250); the through hole (210) is provided on the clear liquid guiding channel.
9. The spiral wound membrane element as described in claim 8, characterized in that: The clear liquid guiding channel is composed of a spiral guiding channel (220) and an axial guiding channel (230); or, the clear liquid guiding channel is composed of an axial guiding channel (230) and an circumferential guiding channel (250).
10. A spiral wound membrane water purification system, characterized in that: Includes the spiral wound membrane element as described in any one of claims 1-9.