Spiral-wound membrane element as well as preparation method and application thereof

Abstract

The invention discloses a spiral-wound membrane element as well as a preparation method and application thereof, and solves the technical problems that a spiral-wound membrane element in the prior art generates a telescope phenomenon, a concentrated water separation net rushes out of a membrane cylinder, and two ends of a membrane bag are severely sunken. The spiral-wound membrane element comprises a membrane cylinder formed by winding a membrane bag; the radial fixing structures are fixed at the two axial ends of the membrane cylinder in the radial direction of the membrane cylinder. The preparation method comprises the following steps: fixing two axial ends of a film cylinder formed by winding a film bag, and then drilling the two axial ends of the film cylinder along the radial direction of the film cylinder; and embedding a radial fixing structure into the drilled hole to obtain the spiral-wound membrane element.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a rolled membrane element and a preparation method and application thereof. Background Art

[0002] Rolled membrane water purification equipment is widely used in water treatment processes in various fields. Its core component is a cylindrical long-tube rolled membrane element. Traditional rolled membrane elements generally include membrane bags, concentrated water screens, water collection pipes and end caps. The membrane bags have clear liquid screens inside. Multiple membrane bags and concentrated water screens are wound around the water collection pipe. Two end caps are used at both ends of the water collection pipe to fix the two ends of the membrane cylinder. Then, the outside of the membrane cylinder is wrapped with a fiberglass shell to form a rolled membrane element. The new type of rolled membrane element can form a sealed clear liquid drainage channel through the self-locking method of the end cap, thereby eliminating the water collection pipe.

[0003] At present, the following problems have occurred during the operation of spiral membrane elements under high pressure difference:

[0004] First, in addition to supporting the membrane bag and the membrane cylinder formed by the concentrated water separator, the water collecting pipe also needs to have through holes on the wall of the water collecting pipe so that the clear liquid produced by the filtration of the membrane bag can flow into the water collecting pipe through the through holes and be discharged. However, the number of through holes on the water collecting pipe is limited, and the clear liquid needs to flow along the surface of the water collecting pipe for a certain distance before reaching the opening position. When the membrane bag is under greater pressure, the gap between the membrane bag and the water collecting pipe becomes smaller, resulting in poor fluidity of the clear liquid on the surface of the water collecting pipe. It often requires a large loss of driving force to flow to the through holes, which significantly increases energy consumption.

[0005] Second, the membrane bag and the concentrated water screen will be compressed to different degrees by the water pressure during use, especially for working conditions with high operating pressure, the membrane bag and the concentrated water screen will be compressed to a greater extent; when the membrane bag and the concentrated water screen are compressed, the concentrated water screen and the membrane bag are actually separated. When the inlet flow is large or the membrane is seriously contaminated, the rolled membrane element will produce a "telescope phenomenon" (referring to the misalignment between the membrane bags, forming a telescope-like shape with one end of the membrane bag concave inward and the other end protruding outward) or the concentrated water screen will rush out of the membrane cylinder. At the same time, the end face of the membrane bag will be concave inward when subjected to high water pressure, causing wrinkles inside the membrane bag. This phenomenon often occurs in actual use. Summary of the invention

[0006] In the first aspect, the purpose of the present invention is to provide a rolled membrane element and a method for preparing the same, so as to solve the technical problems in the prior art of the rolled membrane element producing the "telescope phenomenon", the concentrated water screen rushing out of the membrane cylinder, and the serious depressions at both ends of the membrane bag.

[0007] In order to achieve the purpose of the first aspect above, the technical solution provided by the present invention is as follows:

[0008] The rolled membrane element comprises a membrane cylinder formed by winding a membrane bag, and also comprises a radial fixing structure for fixing the membrane cylinder along the radial direction at both axial ends of the membrane cylinder.

[0009] As a further improvement of the rolled membrane element described in the first aspect above: the radial fixing structure includes support rods embedded along the radial direction of the membrane cylinder.

[0010] As a further improvement of the rolled membrane element described in the first aspect above: the support rods include metal rods evenly distributed along the circumferential direction of the membrane cylinder.

[0011] As a further improvement of the rolled 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 of the rolled membrane element described in the first aspect above: the support rod extends out of the outer surface of the membrane cylinder by 2 to 6 mm in the radial direction of the membrane cylinder.

[0013] As a further improvement of the rolled membrane element described in the first aspect above: the membrane bag is formed by bonding two overlapping layers of membrane sheets to form a clear liquid cavity between the two layers of membrane sheets, and a clear liquid separation net is provided in the clear liquid cavity; the bonding part of the membrane sheets forms a sealing section located at both ends of the membrane cylinder after the membrane bag is wound, and the clear liquid separation net forms a sealing portion located on the inner side of the sealing section after the membrane bag is wound; the support rod is arranged in 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 portion.

[0014] As a further improvement of the rolled membrane element described in the first aspect above: when no water collecting pipe is arranged inside the membrane cylinder, the support rod extends radially into the sealing part along the membrane cylinder, 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 collecting pipe is arranged inside the membrane cylinder, the support rod extends radially into the membrane cylinder along the membrane cylinder to pass through the sealing part and extend into the water collecting pipe, and the distance between the inner end of the support rod and the inner surface of the water collecting pipe is 2.5 to 5 mm.

[0015] The method for preparing the wound membrane element according to the first aspect comprises the following steps:

[0016] The two axial ends of the film cylinder formed by winding the film bag are fixed, and then holes are drilled at the two axial ends of the film cylinder along the radial direction of the film cylinder;

[0017] The radial fixing structure is embedded into the drilled hole to obtain the rolled membrane element.

[0018] In the first type of rolled membrane element mentioned above, by applying a radial fixing structure at both ends of the membrane cylinder, the anti-dislocation performance of the membrane cylinder is significantly improved, and the structural stability can be maintained for a long time even under a large water inlet flow rate. It is not easy to have technical problems such as the "telescope phenomenon", the concentrated water screen rushing out of the membrane cylinder, and the serious depressions at both ends of the membrane bag, thereby ensuring long-term high treatment efficiency.

[0019] In a second aspect, the present invention aims to provide a rolled membrane element and a rolled membrane water purification device to solve the technical problem of poor fluidity of the clear liquid on the surface of the water collecting pipe in the prior art.

[0020] In order to achieve the purpose of the second aspect above, the technical solution provided by the present invention is as follows:

[0021] A rolled membrane element comprises a membrane cylinder formed by winding a membrane bag, and also comprises a water collecting pipe for discharging clear liquid filtered by the membrane bag; the opening edge of the membrane bag is connected to the water collecting pipe, and the water collecting pipe is provided with a through hole connected to the opening edge of the membrane bag; the surface of the water collecting pipe is also provided with a clear liquid diversion channel, and the clear liquid diversion channel comprises at least one of a spiral diversion channel, an axial diversion channel and an annular diversion channel; the through hole is provided on the clear liquid diversion channel.

[0022] As a further improvement of the rolled membrane element described in the second aspect above: the spiral guide channel is in the shape of a cylindrical spiral line; the axial guide channels are multiple and are arranged in parallel at equal intervals along the circumference of the water collecting pipe; the circumferential guide channels are multiple and are arranged in parallel at equal intervals along the axial direction of the water collecting pipe.

[0023] As a further improvement of the rolled membrane element described in the second aspect above: the clear liquid guide channel is composed of a spiral guide channel and an axial guide channel; or, the clear liquid guide channel is composed of an axial guide channel and an annular guide channel.

[0024] As a further improvement of the rolled membrane element described in the second aspect above: the through hole is arranged on the spiral flow guide channel or the annular flow guide channel between two adjacent axial flow guide channels.

[0025] As a further improvement of the rolled membrane element described in the second aspect above: the cross-sectional width of the clear liquid guide channel is 1 to 8 mm, and the depth is 1 to 5 mm.

[0026] As a further improvement of the rolled membrane element described in the second aspect above: the membrane bag is formed by winding at least two membrane bags, and a concentrated water separator is provided between two adjacent membrane bags.

[0027] As a further improvement of the rolled membrane element described in the second aspect above: it also includes an axial fixing structure for fixing the axial ends of the membrane cylinder, the axial fixing structure includes end covers, and the membrane bag is fixed at both ends of the water collecting pipe by end covers after being wound into a membrane cylinder along the circumference of the water collecting pipe.

[0028] As a further improvement of the rolled membrane element described in the second aspect above: both ends of the water collecting pipe are threadedly connected to the end covers.

[0029] In the above-mentioned second type of rolled membrane element, a clear liquid diversion channel connected to the through hole is opened on the surface of the water collecting pipe, so that the fluidity of the clear liquid on the water collecting pipe is significantly improved. Especially when the clear liquid diversion channel is composed of a spiral diversion channel and an axial diversion channel, the clear liquid has abundant flow paths and can flow quickly to the through hole. Even under high pressure, there is no need to apply a high driving force, thereby significantly reducing energy consumption.

[0030] On the third aspect, the purpose of the present invention is to provide a rolled membrane element and a rolled membrane water purification equipment to solve the technical problems in the prior art of poor fluidity of the clear liquid on the surface of the water collecting pipe, the "telescope phenomenon" of the rolled membrane element, the concentrated water screen rushing out of the membrane cylinder, and serious depressions at both ends of the membrane bag.

[0031] In order to achieve the purpose of the third aspect above, the technical solution provided by the present invention is as follows:

[0032] The rolled membrane element includes a membrane cylinder formed by winding a membrane bag, and also includes: a water collecting pipe for discharging clear liquid after being filtered by the membrane bag; the opening edge of the membrane bag is connected to the water collecting pipe, and the wall of the water collecting pipe is provided with a through hole connected to the opening edge of the membrane bag; the water collecting pipe is provided with a clear liquid diversion channel; a radial fixing structure is provided at both axial ends of the membrane cylinder and fixed along the radial direction of the membrane cylinder; an axial fixing structure is used to fix the axial ends of the membrane cylinder; the axial fixing structure includes end covers, and the membrane bag is fixed at both ends of the water collecting pipe with end covers after being wound into a membrane cylinder along the circumference of the water collecting pipe.

[0033] As a further improvement of the rolled membrane element described in the third aspect above: the radial fixing structure includes support rods embedded along the radial direction of the membrane cylinder.

[0034] As a further improvement of the rolled membrane element described in the third aspect above: the support rods include metal rods evenly distributed along the circumferential direction of the membrane cylinder; the metal rods are steel nails with a diameter of 0.2 to 1.5 cm.

[0035] As a further improvement of the rolled membrane element described in the third aspect above: the support rod extends out of the outer surface of the membrane cylinder by 2 to 6 mm in the radial direction of the membrane cylinder.

[0036] As a further improvement of the rolled membrane element described in the third aspect above: the membrane bag is formed by bonding two overlapping layers of membrane sheets to form a clear liquid cavity between the two layers of membrane sheets, and a clear liquid separation net is provided in the clear liquid cavity; the bonding part of the membrane sheets forms a sealing section located at both ends of the membrane cylinder after the membrane bag is wound, and the clear liquid separation net forms a sealing portion located on the inner side of the sealing section after the membrane bag is wound; the support rod is arranged in 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 portion.

[0037] As a further improvement of the rolled membrane element described in the third aspect above: when no water collecting pipe is provided inside the membrane cylinder, the support rod extends radially into the sealing portion along the membrane cylinder, and the distance between the inner end of the support rod and the inner surface of the sealing portion is 1 to 2.5 mm; when a water collecting pipe is provided inside the membrane cylinder, the support rod extends radially into the membrane cylinder along the membrane cylinder to pass through the sealing portion and extend into the water collecting pipe, and the distance between the inner end of the support rod and the inner surface of the water collecting pipe is 2.5 to 5 mm.

[0038] As a further improvement of the rolled membrane element described in the third aspect above: both ends of the water collecting pipe are threadedly connected to the end covers.

[0039] As a further improvement of the rolled membrane element described in the third aspect above: the clear liquid guide channel includes at least one of a spiral guide channel, an axial guide channel and an annular guide channel; and the through hole is arranged on the clear liquid guide channel.

[0040] As a further improvement of the wound membrane element described in the third aspect above: the clear liquid guide channel is composed of a spiral guide channel and an axial guide channel; or the clear liquid guide channel is composed of an axial guide channel and an annular guide channel

[0041] The third type of rolled membrane element mentioned above has the advantages of the above two types of rolled membrane elements. It can ensure long-term high structural stability and treatment efficiency through the radial fixing structure at both ends of the membrane cylinder, and can reduce the clear liquid flow resistance and thus reduce energy consumption through the clear liquid diversion channel on the water collecting pipe.

[0042] In a fourth aspect, the present invention aims to provide a wound membrane element processing tool with a simple structure and convenient operation to process the wound membrane element described in the first aspect. The technical solution is as follows:

[0043] The processing tooling of the rolled membrane element, the rolled membrane element includes a membrane cylinder formed by winding a membrane bag, and the processing tooling includes: a fixing part, used to fix the axial ends of the membrane cylinder; a drilling part, used to drill holes along the radial direction of the membrane cylinder at the fixed end of the membrane cylinder; the drilling part includes a drill bit and a first motor; an jacking part, used to push the support rod into the drilled hole; the jacking part has a radial telescopic rod adapted to the size of the support rod; and a rotating part, used to drive the membrane cylinder to rotate.

[0044] As a further improvement of the processing tooling of the rolled membrane element described in the fourth aspect above: the fixing part includes support seats arranged at both ends of the membrane cylinder, an axial telescopic rod arranged at one end of the membrane cylinder, and an axial cylinder driving the axial telescopic rod to extend and retract.

[0045] As a further improvement of the processing tooling of the rolled membrane element described in the fourth aspect above: the drilling part also includes a lifting mechanism arranged on the support seat and a support frame arranged on the lifting mechanism, the first motor is arranged on the support frame, and the drilling hole is arranged downward.

[0046] As a further improvement of the processing tooling of the rolled membrane element described in the fourth aspect above: the lifting mechanism is a screw lifting mechanism.

[0047] As a further improvement of the processing tooling of the rolled membrane element described in the fourth aspect above: the pushing portion also includes a radial cylinder arranged on the side of the support seat and used to drive the radial telescopic rod to extend and retract.

[0048] As a further improvement of the processing tooling of the rolled membrane element described in the fourth aspect above: the rotating part includes a rotating wheel arranged on both sides of the axial direction of the membrane cylinder and a second motor driving the rotating wheel to rotate, and the rotating wheel is fixed between the support seats.

[0049] As a further improvement of the processing tooling of the rolled membrane element described in the fourth aspect above: the processing tooling also includes a clamping portion for clamping the support rod, and the clamping portion includes a clamping claw arranged above the jacking portion.

[0050] The processing tooling of the above-mentioned rolled membrane element has a simple structure and is easy to operate, which can significantly improve the processing efficiency and processing quality of the radial fixing structure, and help the radial fixing structure to exert an efficient shape-keeping effect.

[0051] In a fifth aspect, the present invention aims to provide a spiral membrane water purification device and a water treatment method using the spiral membrane element, and the technical scheme is as follows:

[0052] The spiral membrane water purification equipment comprises any one of the spiral membrane elements mentioned above.

[0053] The water treatment method uses any one of the above-mentioned roll-type membrane elements to filter the water body to be treated, or uses the above-mentioned roll-type membrane water purification equipment to filter the water body to be treated.

[0054] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The drawings constituting a part of the present invention are used to assist in understanding the present invention. The contents provided in the drawings and their related descriptions in the present invention can be used to explain the present invention, but do not constitute improper limitations on the present invention. In the drawings:

[0056] Figure 1 It is a structural schematic diagram of the membrane cylinder of the rolled membrane element of the present invention in the unfolded state.

[0057] Figure 2 It is a schematic diagram of the structure of a single membrane bag in the rolled membrane element of the present invention.

[0058] Figure 3 It is a front view of the rolled membrane element of the present invention.

[0059] Figure 4 for Figure 3 AA section view.

[0060] Figure 5 for Figure 3 A cross-sectional view in the BB direction.

[0061] Figure 6 for Figure 3 Another cross-sectional view along the BB direction.

[0062] Figure 7 It is a schematic structural diagram of the processing tooling used for the rolled membrane element of the present invention.

[0063] Figure 8 It is a schematic structural diagram of a water collecting pipe in the rolled membrane element of the present invention.

[0064] Fig. 9 It is another structural schematic diagram of the water collecting pipe 200 in the rolled membrane element of the present invention.

[0065] The relevant marks in the above drawings are:

[0066] 100-membrane cylinder, 110-membrane bag, 111-diaphragm, 1110-adhesive layer, 112-clear liquid separator, 113-clear liquid cavity, 120-concentrated water separator, 130-sealing section, 140-sealing part, 150-clear liquid flow channel, 200-water collecting pipe, 210-through hole, 220-spiral guide channel, 230-axial guide channel, 240-external thread, 250-annular guide channel, 300-end cover, 400-housing, 500-support rod, 611-support seat, 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-rotor, 642-second motor, 650-clamp. DETAILED DESCRIPTION

[0067] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person 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:

[0068] The technical solutions and technical features provided in each part of the present invention, including the following description, may be combined with each other if there is no conflict.

[0069] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0070] About the terms and units in the present invention: The terms "include", "have" and any variations thereof in the description and claims of the present invention and related parts are intended to cover non-exclusive inclusions.

[0071] Figure 1 It is a structural schematic diagram of the membrane cylinder of the rolled membrane element of the present invention in the unfolded state.

[0072] like Figure 1 As shown, the membrane cylinder 100 is formed by winding a plurality of groups of membrane bags 110 and concentrated water separators 120 arranged at intervals. One winding method is that the membrane bag 110 is wound with the open end as support, and another method is that the membrane bag 110 is wound along the outer wall of the water collecting pipe 200. Both winding methods use the open end of the membrane bag 110 as the starting end of the winding.

[0073] The membrane bag 110 is formed by bonding two overlapping membrane sheets 111 , forming a clear liquid cavity 113 between the two membrane sheets 111 , and a clear liquid separator 112 is arranged in the clear liquid cavity 113 . The membrane sheets 111 are nanofiltration membrane sheets or reverse osmosis membrane sheets.

[0074] The inner side of the membrane cylinder 100 is wound with 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 sealed by glue. On the one hand, the clear liquid flow channel 150 can provide support for the membrane cylinder 100. On the other hand, it can improve the fluidity of the clear liquid on the surface of the water collecting pipe 200 when the water collecting pipe 200 is set, thereby promoting the clear liquid to flow quickly into the water collecting pipe 200.

[0075] The water to be treated flows between adjacent membrane bags 110 under the guidance of the concentrated water screen 120. Due to the physical interception of the membrane sheet 111, the clear liquid (or pure water) passes through the membrane sheet 111 and enters the membrane bag 110. Then, under the guidance of the clear liquid screen 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 clear liquid flows into the water collecting pipe 200 through the through hole 210 opened on the pipe wall of the water collecting pipe 200 and is discharged.

[0076] Figure 2 It is a schematic diagram of the structure of a single membrane bag in the rolled membrane element of the present invention.

[0077] like Figure 2 As shown, the film bag 110 is bag-shaped and usually rectangular, and the remaining sides except the open end are adhesive layers 1110 for bonding the edges of the overlapping film sheets 111, and the adhesive layers 1110 along the radial direction of the film cylinder 100 form sealing sections 130 located at both ends of the film cylinder 100 after winding, and the multi-layer clear liquid separation nets 112 located at both ends of the clear liquid flow channel 150 are solidified by glue to form a sealing portion 140 located inside the sealing section 130. In another embodiment, the outside of the adhesive layer 1110 also has a small amount of film sheets 111 that are not completely bonded.

[0078] Figure 3 It is a front view of the rolled membrane element of the present invention. Figure 4 for Figure 3 AA section view. Figure 5 for Figure 3 A cross-sectional view in the BB direction. Figure 6 for Figure 3 Another cross-sectional view along the BB direction.

[0079] The first embodiment of the wound membrane element of the present invention is as follows: Figure 3-6 As shown, the roll-type membrane element comprises a membrane cylinder 100 (in the unfolded state as shown in FIG. Figure 1 As shown in the figure, and a radial fixing structure for fixing the membrane cylinder 100 along the radial direction of the membrane cylinder 100 at both axial ends of the membrane cylinder 100. The radial fixing structure includes support rods 500 embedded along the radial direction of the membrane cylinder 100, and the support rods 500 are 10 metal rods evenly distributed along the circumferential direction of the membrane cylinder 100.

[0080] A preferred implementation of the metal rod is to use a steel nail with a diameter of 0.2 to 1.5 cm, thereby achieving a good fixing effect and causing less disturbance to the stability of the overall structure of the membrane element.

[0081] The steel nails extend radially out of the outer surface of the film cylinder 100 by 2 to 6 mm. The portion extending out of the film cylinder 100 can be shaped and flattened when encapsulated with the glass fiber shell, thereby ensuring a better fixing effect.

[0082] like Figure 5 As shown, when a water collecting pipe is provided inside the membrane cylinder 100, the support rod 500 extends radially into the membrane cylinder 100 until it passes through the sealing portion 140 and extends into the water collecting pipe 200, and the distance between the inner end of the support rod 500 and the inner surface of the water collecting pipe 200 is 2.5-5 mm (i.e., the water collecting pipe 200 is not penetrated). Figure 6 As shown, when no water collecting pipe is provided inside the membrane cylinder 100, the support rod 500 extends radially into the sealing portion 140 along the membrane cylinder 100, and the distance between the inner end of the support rod 500 and the inner surface of the sealing portion 140 is 1 to 2.5 mm (i.e., the sealing portion 140 is not penetrated). Both of the above methods require the inner end of the support rod 500 to be inserted into the sealing portion 140, thereby not only achieving a good fixing effect, but also ensuring the flow tightness of the clear liquid and the concentrated water.

[0083] The radial fixing structure and the clear liquid chamber 113 should be independent of each other. Therefore, the radial fixing structure is arranged in the sealing section 130 or at the outer end of the sealing section 130 (as shown in the figure, the radial fixing structure is located in the sealing section 130). Therefore, it will not affect the filtration process and will not affect the flow sealing of the clear liquid and the concentrated water.

[0084] The method for preparing the wound membrane element of this embodiment comprises the following steps:

[0085] The two axial ends of the film cylinder 100 formed by winding the film bag 110 are fixed, and then holes are drilled at the two axial ends of the film cylinder 100 along the radial direction of the film cylinder 100;

[0086] The support rod 500 is inserted into the drilled hole to obtain a rolled membrane element.

[0087] Figure 7 It is a schematic structural diagram of the processing tooling used for the rolled membrane element of the present invention.

[0088] like Figure 7 As shown, the processing tooling used in the preparation method of the rolled membrane element of this embodiment includes a fixing part, a drilling part, a pushing part, a rotating part and a clamping part. The fixing part is used to fix the axial ends of the membrane cylinder 100. The drilling part is used to drill holes along the radial direction of the membrane cylinder 100 at the ends of the fixed membrane cylinder 100. The pushing part is used to push the support rod 500 into the drilled hole. The rotating part is used to drive the membrane cylinder 100 to rotate. The clamping part is used to clamp the support rod 500.

[0089] The fixing part includes support seats 611 provided at both ends of the film cylinder 100 , an axial telescopic rod 612 provided at one end of the film cylinder 100 , and an axial cylinder 613 for driving the axial telescopic rod 612 to extend and retract.

[0090] The drilling part includes a drill bit 621, a first motor 622, a lifting mechanism 623 arranged on the support seat 611, and a support frame 624 arranged on the lifting mechanism 623, the first motor 622 is arranged on the support frame 624, the drilling hole is arranged downward, and the lifting mechanism 623 is a screw lifting mechanism 623.

[0091] The pushing portion includes a radial telescopic rod 631 whose size matches that of the support rod 500 and a radial cylinder 632 disposed on the side of the support seat 611 for driving the radial telescopic rod 631 to extend and retract.

[0092] The rotating part includes rotating wheels 641 disposed on both sides of the film cylinder 100 in the axial direction and a second motor 642 driving the rotating wheels 641 to rotate. The rotating wheels 641 are fixed between the supporting seats 611 .

[0093] The clamping portion includes a clamping claw 650 disposed above the jacking portion and used for clamping the support rod 500 .

[0094] In the specific operation, first, the film cylinder 100 is placed on the two rotating wheels 641, and the axial telescopic rod 612 is driven to extend and retract by the axial cylinder 613, so as to fix the film cylinder 100 between the support seat 611 and the axial telescopic rod 612. Then, the first motor 622 and the drill bit 621 are driven to move downward by the lifting mechanism 623. When the drill bit 621 drills a hole at the end of the film cylinder 100 to the required depth, the first motor 622 and the drill bit 621 are driven to move upward by the lifting mechanism 623. Then, the film cylinder 100 is rotated to a certain angle by the rotating wheel 641, and the support rod 500 clamped by the clamping claw 650 is placed into the drilled hole through the clamping part. Then, the film cylinder 100 is rotated to a certain angle by the rotating wheel 641, and the radial telescopic rod 631 is driven to extend and retract by the radial cylinder 632, so as to completely embed the support rod 500 into the drilled hole. Repeat the above operation, after the 10 support rods 500 at one end of the film cylinder 100 are inlaid, turn the film cylinder 100 around, and then install the support rods 500 at the other end of the film cylinder 100, thus completing the installation of the radial fixing structure.

[0095] Figure 8 It is a structural schematic diagram of the water collecting pipe 200 in the rolled membrane element of the present invention. Fig. 9 It is another structural schematic diagram of the water collecting pipe 200 in the rolled membrane element of the present invention.

[0096] The second embodiment of the rolled membrane element of the present invention is as follows: Figure 3-6As shown in 8-9, on the basis of the first embodiment, the rolled membrane element also includes a water collecting pipe 200 for discharging the clear liquid filtered by the membrane bag 110; the opening edge of the membrane bag 110 is connected to the water collecting pipe 200, and the water collecting pipe 200 is provided with a through hole 210 connected to the opening edge of the membrane bag 110; the surface of the water collecting pipe 200 is also provided with a clear liquid diversion channel, and the clear liquid diversion channel includes at least one of a spiral diversion channel 220, an axial diversion channel 230 and an annular diversion channel 250.

[0097] The spiral guide channel 220 is in the shape of a cylindrical spiral line, the axial guide channels 230 are multiple and are arranged in parallel at equal intervals along the circumference of the water collecting pipe 200, and the annular guide channels 250 are multiple and are arranged in parallel at equal intervals along the axial direction of the water collecting pipe 200, thereby making the flow path of the clear liquid richer and the flow resistance smaller.

[0098] Preferably, if Figure 8 As shown, the clear liquid guide channel is composed of a spiral guide channel 220 and an axial guide channel 230, or, as shown in Fig. 9 As shown, the clear liquid guide channel is composed of an axial guide channel 230 and an annular guide channel 250, thereby making the flow path of the clear liquid more abundant and the flow resistance smaller.

[0099] The through hole 210 is disposed on the spiral flow guiding channel 220 or the annular flow guiding channel 250 between two adjacent axial flow guiding channels 230 , thereby facilitating the clear liquid to flow into the through hole 210 quickly.

[0100] The cross-sectional width of the clear liquid diversion channel is 1 to 8 mm, and the depth is 1 to 5 mm, thereby ensuring good fresh water fluidity and allowing the water collecting pipe 200 to retain a high strength to support the membrane cylinder 100 .

[0101] The third embodiment of the rolled membrane element of the present invention is as follows: Figure 3-4 As shown, on the basis of the second embodiment, the rolled membrane element also includes an axial fixing structure for fixing the axial ends of the membrane cylinder 100, and the axial fixing structure includes an end cover 300. After the membrane bag 110 is wound circumferentially along the water collecting pipe 200 to form the membrane cylinder 100, the end covers 300 are used to fix the two ends of the water collecting pipe 200.

[0102] The conventional connection method of the water collecting pipe 200 and the end cap 300 is bonding, which has poor bonding strength and the adhesive performance is easy to fail during long-term immersion. In this embodiment, the two ends of the water collecting pipe 200 are provided with external threads 240, and the center hole of the end cap 300 is provided with external threads 240, thereby making the water collecting pipe 200 and the end cap 300 threadedly connected. Compared with the conventional bonding method, the threaded connection can significantly improve the connection strength of the water collecting pipe 200 and the end cap 300, thereby improving the structural stability of the membrane element.

[0103] The fourth embodiment of the wound membrane element of the present invention is as follows: Figure 3-6 As shown in Figures 8-9, the rolled membrane element includes the above-mentioned membrane cylinder 100, the radial fixing structure, the water collecting pipe 200 and the axial fixing structure.

[0104] The beneficial effects of the rolled membrane element of the present invention are illustrated below by experimental data.

[0105] First, the deformation degree of the conventional wound membrane element and the wound membrane element of this embodiment under different water inlet flow rates were tested, wherein the water inlet flow rates were set to 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26 m / s, respectively. 3 / h, the water inlet pressure is 120bar, and the concentration of the liquid to be treated (NaCl solution) is set to 200000mg / L.

[0106] It has been verified that the membrane cartridge 100 of conventional spiral membrane elements can only be used at a length of ≤12m. 3 / h, but as the water flow rate increases, the membrane cylinder 100 gradually deforms, especially when the water flow rate reaches 20m / h. 3 / h or more, the membrane cylinder 100 is severely deformed, resulting in a very obvious "telescope phenomenon". 3 / h water inlet flow rate, and no deformation occurs.

[0107] Then, the water production of conventional rolled membrane elements and the rolled membrane elements of this embodiment under different working conditions was tested, wherein the water inlet pressures of the three working conditions were set to 55, 90, and 120 bar, respectively, and the concentrations of the treated liquid (NaCl solution) were set to 32000, 70000, and 100000 mg / L, respectively.

[0108] It has been verified that under three working conditions, the water production of conventional spiral membrane elements is 1.14, 0.82, and 0.65m 3 / h, while the water production of the spiral membrane element in this embodiment is 1.21, 1.08 and 0.95m 3 / h. By comparison, it can be seen that the water production of the wound membrane element of this embodiment is higher under the three working conditions, indicating that the fluidity of the clear liquid on the water collecting pipe 200 is better.

[0109] An embodiment of the spiral membrane water purification device of the present invention comprises a spiral membrane element as described in any one of the above embodiments.

[0110] An embodiment of the water treatment method of the present invention is to use the roll-type membrane element described in any one of the above embodiments to filter the water body to be treated, or to use the above roll-type membrane water purification equipment to filter the water body to be treated.

[0111] The above is a description of the relevant contents of the present invention. A person skilled in the art will be able to implement the present invention based on these descriptions. Based on the above contents of the present invention, all other embodiments obtained by a person skilled in the art without creative work shall fall within the scope of protection of the present invention.

Claims

1. A rolled membrane element, comprising a membrane cylinder (100) formed by winding a membrane bag (110); characterized in that: It also includes radial fixing structures for fixing the membrane cylinder (100) in the radial direction at both axial ends of the membrane cylinder (100).

2. The wound membrane element according to claim 1, characterized in that: The radial fixing structure comprises a support rod (500) embedded in the radial direction of the membrane cylinder (100).

3. The wound membrane element according to claim 2, characterized in that: The support rod (500) comprises metal rods evenly distributed along the circumferential direction of the film cylinder (100).

4. The wound membrane element according to claim 3, characterized in that: The metal rod is a steel nail with a diameter of 0.2 to 1.5 cm.

5. The wound membrane element according to claim 2, characterized in that: The support rod (500) extends out of the outer surface of the film cylinder (100) by 2 to 6 mm in the radial direction of the film cylinder (100).

6. The wound membrane element according to claim 2, characterized in that: The film bag (110) is formed by bonding two overlapping film sheets (111), a clear liquid cavity (113) is formed between the two film sheets (111), and a clear liquid separation net (112) is provided in the clear liquid cavity (113); The bonding part of the film sheet (111) forms a sealing section (130) located at both ends of the film cylinder (100) after the film bag (110) is wound, and the clear liquid separator (112) forms a sealing portion (140) located inside the sealing section (130) after the film bag (110) is wound. The support rod (500) is arranged 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 portion (140).

7. The wound membrane element according to claim 6, characterized in that: When no water collecting pipe is provided inside the membrane cylinder (100), the support rod (500) extends radially into the sealing portion (140) along the membrane cylinder (100), and the distance between the inner end of the support rod (500) and the inner surface of the sealing portion (140) is 1 to 2.5 mm; When a water collecting pipe is provided inside the membrane cylinder (100), the support rod (500) extends radially into the membrane cylinder (100) to pass through the sealing portion (140) and into the water collecting pipe (200), and the distance between the inner end of the support rod (500) and the inner surface of the water collecting pipe (200) is 2.5 to 5 mm.

8. Roll-type membrane water purification equipment, characterized in that: The invention comprises a rolled membrane element as described in any one of claims 1 to 7.

9. The method for preparing a wound membrane element according to any one of claims 1 to 7, characterized in that: The following steps are involved: The two axial ends of a film cylinder (100) formed by winding a film bag (110) are fixed, and then holes are drilled at the two axial ends of the film cylinder (100) along the radial direction of the film cylinder (100); The radial fixing structure is embedded into the drilled hole to obtain the rolled membrane element.

10. A water treatment method, characterized in that: The water to be treated is filtered by using the wound membrane element described in any one of claims 1 to 7, or the water to be treated is filtered by using the wound membrane water purification equipment described in claim 8.

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