Spiral-wound membrane element and spiral-wound membrane water purification equipment

Abstract

The utility model discloses a spiral-wound membrane element and spiral-wound membrane water purification equipment, and solves the technical problem of poor flowability of clear liquid on the surface of a water collecting pipe in the prior art. The spiral-wound membrane element comprises a membrane cylinder formed by winding a membrane bag, and further comprises a water collecting pipe for discharging clear liquid filtered by the membrane bag; the opening edge of the membrane bag is connected with the water collecting pipe, and the water collecting pipe is provided with a through hole communicated with the opening edge of the membrane bag; the surface of the water collecting pipe is also provided with a clear liquid flow guide channel; the clear liquid flow guide channel comprises at least one of a spiral flow guide channel, an axial flow guide channel and an annular flow guide channel; and the through hole is formed in the clear liquid guide channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water treatment, and particularly relates to a spiral-wound membrane element and spiral-wound membrane water purification equipment. BACKGROUND

[0002] The spiral-wound membrane water purification equipment is widely used in water treatment processes in various fields, and its core component is a cylindrical spiral-wound membrane element. The traditional spiral-wound membrane element generally comprises a membrane bag, a concentrated water separation net, a water collecting pipe and an end cover. The membrane bag has a clear liquid separation net inside. A plurality of membrane bags and concentrated water separation nets are wound on the water collecting pipe. Two end covers are used to fix the two ends of the membrane cylinder. Then, a fiberglass shell is wrapped outside the membrane cylinder to form the spiral-wound membrane element. The new spiral-wound membrane element can form a sealed clear liquid drainage channel through the self-locking of the end cover, thereby eliminating the need for a water collecting pipe.

[0003] At present, the spiral-wound membrane element has the following problems during operation under high pressure difference:

[0004] Firstly, in addition to supporting the membrane cylinder formed by winding the membrane bag and the concentrated water separation net, the water collecting pipe also needs to have through holes on the pipe wall to allow the clear liquid produced by filtering through the membrane bag to flow into the inside of the water collecting pipe and be discharged after passing through the through holes. However, the number of through holes on the water collecting pipe is limited. The clear liquid needs to flow a certain distance along the surface of the water collecting pipe before reaching the hole position. When the membrane bag is subjected to a large pressure, the gap between the membrane bag and the water collecting pipe becomes small, which makes the flowability of the clear liquid on the surface of the water collecting pipe very poor. A large driving force is often needed to flow to the through hole, thereby significantly increasing the energy consumption.

[0005] Secondly, the membrane bag and the concentrated water separation net will be compressed to varying degrees by water pressure during use, especially for high operating pressure conditions. The membrane bag and the concentrated water separation net will be compressed to a large extent. When the membrane bag and the concentrated water separation net are both compressed, the concentrated water separation net and the membrane bag are actually in a separated state. When the water inflow is large or the membrane sheet is severely contaminated, it will cause the spiral-wound membrane element to have a "telescope phenomenon" (referring to the misalignment between the membrane bags, forming a shape similar to a telescope with one end of the membrane bag inwardly concave and the other end outwardly protruding) or the concentrated water separation net to be ejected from the membrane cylinder. At the same time, the end face of the membrane bag will be inwardly concave when subjected to a high water pressure, causing wrinkles inside the membrane bag. This phenomenon often occurs in actual use. SUMMARY

[0006] In the first aspect, the purpose of the utility model is to provide a spiral-wound membrane element and a preparation method thereof to solve the technical problems of the "telescope phenomenon", the ejection of the concentrated water separation net from the membrane cylinder and the severe concave of the two ends of the membrane bag in the prior art.

[0007] To achieve the purpose of the first aspect, the technical solution provided by the utility model is as follows:

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

[0009] As a further improvement of the volume membrane element of the first aspect, the radial fixing structure comprises support rods inlaid along the radial direction of the membrane cylinder.

[0010] As a further improvement of the volume membrane element of the first aspect, the support rods comprise metal rods uniformly distributed along the circumferential direction of the membrane cylinder.

[0011] As a further improvement of the volume membrane element of the first aspect, the metal rods are steel nails with a diameter of 0.2-1.5 cm.

[0012] As a further improvement of the volume membrane element of the first aspect, the support rods protrude 2-6 mm out of the outer surface of the membrane cylinder along the radial direction of the membrane cylinder.

[0013] As a further improvement of the volume membrane element of the first aspect, the membrane bag is formed by bonding two layers of membrane sheets arranged in an overlapping manner, a clear liquid cavity is formed between the two layers of membrane sheets, and a clear liquid separation net is arranged in the clear liquid cavity; the bonding part of the membrane sheets forms a sealing section at both ends of the membrane cylinder after the membrane bag is wound; the clear liquid separation net forms a sealing part inside the sealing section after the membrane bag is wound; the support rods are arranged inside the sealing section or at the outer end of the sealing section, and the inner end of the support rods is inserted into the sealing part.

[0014] As a further improvement of the volume membrane element of the first aspect, when no water collecting pipe is arranged inside the membrane cylinder, the support rods protrude into the sealing part along the radial direction of the membrane cylinder, and the distance between the inner end of the support rods and the inner surface of the sealing part is 1-2.5 mm; when a water collecting pipe is arranged inside the membrane cylinder, the support rods protrude through the sealing part and into the water collecting pipe along the radial direction of the membrane cylinder, and the distance between the inner end of the support rods and the inner surface of the water collecting pipe is 2.5-5 mm.

[0015] The preparation method of the volume membrane element of the first aspect comprises the following steps:

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

[0017] The radial fixing structure is inlaid into the holes to obtain the volume membrane element.

[0018] In the first type of the above-mentioned membrane element, the anti-dislocation performance of the membrane cylinder is significantly improved by applying the radial fixing structure at both ends of the membrane cylinder, so that the structural stability can be maintained for a long time even under a large water inflow, and technical problems such as 'telescope phenomenon', outflow of the concentrated water screen from the membrane cylinder, and serious sagging at both ends of the membrane bag can be avoided, thereby ensuring a long-term high treatment efficiency.

[0019] In a second aspect, the utility model discloses a membrane element and a membrane water purification device to solve the technical problem of poor flowability of the clear liquid on the surface of the water collecting pipe.

[0020] To achieve the above-mentioned second aspect, the utility model provides the technical scheme as follows:

[0021] The membrane element comprises a membrane cylinder formed by winding a membrane bag, and a water collecting pipe for discharging the clear liquid filtered by the membrane bag; the opening edge of the membrane bag is connected with the water collecting pipe, and the water collecting pipe is provided with a through hole in communication with the opening edge of the membrane bag; the surface of the water collecting pipe is further provided with a clear liquid flow guide channel, and the clear liquid flow guide channel comprises at least one of a spiral flow guide channel, an axial flow guide channel and a ring-shaped flow guide channel; and the through hole is arranged on the clear liquid flow guide channel.

[0022] As a further improvement of the above-mentioned second aspect, the spiral flow guide channel is in the shape of a cylindrical spiral line; the axial flow guide channels are multiple and arranged in parallel at equal intervals along the circumference of the water collecting pipe; and the ring-shaped flow guide channels are multiple and arranged in parallel at equal intervals along the axis of the water collecting pipe.

[0023] As a further improvement of the above-mentioned second aspect, the clear liquid flow guide channel is composed of the spiral flow guide channel and the axial flow guide channel; or the clear liquid flow guide channel is composed of the axial flow guide channel and the ring-shaped flow guide channel.

[0024] As a further improvement of the above-mentioned second aspect, the through hole is arranged on the spiral flow guide channel or the ring-shaped flow guide channel between two adjacent axial flow guide channels.

[0025] As a further improvement of the above-mentioned second aspect, the cross-sectional width of the clear liquid flow guide channel is 1-8 mm, and the depth is 1-5 mm.

[0026] As a further improvement of the above-mentioned second aspect, the membrane bag is formed by winding at least two membrane bags, and a concentrated water screen is arranged between the two adjacent membrane bags.

[0027] Further improvement of the roll type membrane element according to the second aspect: further comprising axial fixing structure for fixing the axial two ends of the membrane cylinder, the axial fixing structure comprises end cap, the membrane bag is fixed by end cap after being wound into membrane cylinder along the water collecting pipe.

[0028] Further improvement of the roll type membrane element according to the second aspect: the two ends of the water collecting pipe are screwed with end cap.

[0029] In the second roll type membrane element, the flowability of the clear liquid on the surface of the water collecting pipe is significantly improved by opening the clear liquid flow channel on the surface of the water collecting pipe, especially when the clear liquid flow channel is composed of spiral flow channel and axial flow channel, the flow path of the clear liquid is rich, and the clear liquid can quickly flow to the through hole, without applying high driving force even under high pressure, so that the energy consumption can be significantly reduced.

[0030] Thirdly, the utility model discloses a roll type membrane element and a roll type membrane water purification equipment to solve the technical problems of poor flowability of the clear liquid on the surface of the water collecting pipe, "telescope phenomenon" of the roll type membrane element, and serious concave of the two ends of the membrane bag.

[0031] In order to realize the above-mentioned third aspect, the utility model provides the technical scheme as follows:

[0032] The roll type membrane element comprises a membrane cylinder formed by winding a membrane bag, and further comprises: a water collecting pipe for discharging the clear liquid filtered by the membrane bag; an opening edge of the membrane bag is connected with the water collecting pipe, and a through hole is arranged on the wall of the water collecting pipe and communicated with the opening edge of the membrane bag; a clear liquid flow channel is arranged on the water collecting pipe; a radial fixing structure is arranged at the axial two ends of the membrane cylinder and fixed along the radial direction of the membrane cylinder; an axial fixing structure is arranged for fixing the axial two ends of the membrane cylinder; the axial fixing structure comprises an end cap, and the membrane bag is fixed by the end cap after being wound into the membrane cylinder along the circumferential direction of the water collecting pipe.

[0033] Further improvement of the roll type membrane element according to the third aspect: the radial fixing structure comprises a support rod embedded along the radial direction of the membrane cylinder.

[0034] Further improvement of the roll type membrane element according to the third aspect: the support rod comprises a metal rod uniformly distributed along the circumferential direction of the membrane cylinder; and the metal rod is a steel nail with a diameter of 0.2-1.5 cm.

[0035] Further improvement of the roll type membrane element according to the third aspect: the support rod protrudes outward from the surface of the membrane cylinder by 2-6 mm along the radial direction of the membrane cylinder.

[0036] As a further improvement of the third aspect, the membrane bag is formed by two overlapped membrane sheets, and a clear liquid cavity is formed between the two membrane sheets, and a clear liquid separation net is arranged in the clear liquid cavity; the adhesive part of the membrane sheet forms a sealing section at the two ends of the membrane cylinder 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 part.

[0037] As a further improvement of the third aspect, when the membrane cylinder is not provided with a water collecting pipe, the support rod extends into the sealing part along the radial direction of the membrane cylinder, and the distance between the inner end of the support rod and the inner surface of the sealing part is 1-2.5 mm; when the membrane cylinder is provided with a water collecting pipe, the support rod extends through the sealing part and extends 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 2.5-5 mm.

[0038] As a further improvement of the third aspect, the two ends of the water collecting pipe are threadedly connected with end covers.

[0039] As a further improvement of the third aspect, the clear liquid flow channel comprises at least one of a spiral flow channel, an axial flow channel and a ring flow channel; and the through hole is arranged on the clear liquid flow channel.

[0040] As a further improvement of the third aspect, the clear liquid flow channel is composed of a spiral flow channel and an axial flow channel; or the clear liquid flow channel is composed of an axial flow channel and a ring flow channel.

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

[0042] In a fourth aspect, the utility model discloses a processing tool for a membrane element, which is used for processing the membrane element of the first aspect and has the following technical scheme:

[0043] The processing tool for the membrane element comprises a fixing part for fixing the axial two ends of the membrane cylinder, a drilling part for drilling a hole along the radial direction of the membrane cylinder at the fixed end of the membrane cylinder, wherein the drilling part comprises a drill bit and a first motor, a jacking part for jacking the support rod into the hole, wherein the jacking part has a radial telescopic rod matched with the size of the support rod, and a rotating part for driving the membrane cylinder to rotate.

[0044] As a further improvement of the processing tool of the roll type membrane element of the fourth aspect, the fixing part comprises 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 for driving the axial telescopic rod to telescope.

[0045] As a further improvement of the processing tool of the roll type membrane element of the fourth aspect, the drilling part further comprises 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 part is arranged downward.

[0046] As a further improvement of the processing tool of the roll type membrane element of the fourth aspect, the lifting mechanism is a screw rod lifting mechanism.

[0047] As a further improvement of the processing tool of the roll type membrane element of the fourth aspect, the jacking part further comprises a radial cylinder arranged on the side of the support seat and used for driving the radial telescopic rod to telescope.

[0048] As a further improvement of the processing tool of the roll type membrane element of the fourth aspect, the rotating part comprises rotating wheels arranged on both axial sides of the membrane cylinder and a second motor for driving the rotating wheels to rotate, and the rotating wheels are fixed between the support seats.

[0049] As a further improvement of the processing tool of the roll type membrane element of the fourth aspect, the processing tool further comprises a clamping part for clamping the support rod, and the clamping part comprises a clamping jaw arranged above the jacking part.

[0050] The processing tool of the roll type membrane element has simple structure and convenient operation, can significantly improve the processing efficiency and processing quality of the radial fixing structure, and helps the radial fixing structure to play a high-efficiency shape-preserving effect.

[0051] In a fifth aspect, the utility model aims to provide a roll type membrane water purification device and a water treatment method using the roll type membrane element.

[0052] The roll type membrane water purification device comprises any one of the roll type membrane elements.

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

[0054] The utility model will be further described below in combination with the drawings and specific embodiments. The additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be known through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0055] The drawings that form part of the present application serve to assist in the understanding of the present application, the content provided in the drawings and the related description in the present application can be used to explain the present application, but do not constitute improper limitation on the present application.

[0056] In the drawings:

[0057] Figure 1 It is a structural schematic view of the unfolded state of the membrane cylinder of the roll type membrane element of the present application.

[0058] Figure 2 It is a structural schematic view of a single membrane bag in the roll type membrane element of the present application.

[0059] Figure 3 It is a front view of the roll type membrane element of the present application.

[0060] Figure 4 It is Figure 3 A-A sectional view.

[0061] Figure 5 It is Figure 3 B-B sectional view of one kind.

[0062] Figure 6 It is Figure 3 B-B sectional view of another kind.

[0063] Figure 7 It is a structural schematic view of the processing tooling used in the roll type membrane element of the present application.

[0064] Figure 8 It is a structural schematic view of a water collecting pipe in the roll type membrane element of the present application.

[0065] Figure 9 It is another structural schematic view of the water collecting pipe 200 in the roll type membrane element of the present application.

[0066] The related marks in the above drawings are:

[0067] 100 - membrane cartridge, 110 - membrane bag, 111 - membrane sheet, 1110 - adhesive layer, 112 - clear liquid separation net, 113 - clear liquid cavity, 120 - concentrated water separation net, 130 - sealing section, 140 - sealing part, 150 - clear liquid flow channel, 200 - water collecting pipe, 210 - through hole, 220 - spiral flow guide channel, 230 - axial flow guide channel, 240 - external thread, 250 - annular flow guide channel, 300 - end cover, 400 - shell, 500 - support rod, 611 - support seat, 612 - axial telescopic rod, 613 - axial air cylinder, 621 - drill bit, 622 - first motor, 623 - lifting mechanism, 624 - support frame, 631 - radial telescopic rod, 632 - radial air cylinder, 641 - runner, 642 - second motor, 650 - clamping jaw. DETAILED DESCRIPTION

[0068] The present application will be described in greater detail by making reference to the drawings. Those skilled in the art will be able to implement the present application based on the description given herein. Before the present application is disclosed and described in detail below, it is to be understood that the application is not limited in its application to the details of design and the procedure set forth in the following description or illustrated in the drawings. The present application is capable of other embodiments and of being practiced or being carried out in various ways.

[0069] The technical solutions and technical features provided in the various parts including the following description can be combined with each other without conflict.

[0070] In addition, the embodiments of the present application involved in the following description are generally only a part of the embodiments of the present application, not all the embodiments. Therefore, based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0071] Regarding the terms and units in the present application. The terms "include", "have" and any variations thereof in the specification and claims of the present application and related parts are intended to cover non-exclusive inclusion.

[0072] Figure 1 The structure diagram of the unfolded state of the membrane cartridge of the roll type membrane element of the present application.

[0073] As shown in Figure 1 The membrane cartridge 100 is wound by arranging multiple groups of membrane bags 110 and concentrated water separation nets 120 at intervals, one winding method is to wind the membrane bags 110 with the open end as the support, and the other method is to wind the membrane bags 110 along the outer wall of the water collecting pipe 200, both winding methods take the open end of the membrane bag 110 as the starting end of winding.

[0074] The membrane bag 110 is formed by bonding two overlapped membrane sheets 111, and a clear liquid cavity 113 is formed between the two membrane sheets 111, wherein the clear liquid cavity 113 is provided with a clear liquid screen 112, and the membrane sheet 111 is a nanofiltration membrane sheet or a reverse osmosis membrane sheet.

[0075] The inner side of the membrane cylinder 100 is wound by the multiple clear liquid screens 112 to form a circular clear liquid flow channel 150, and the multiple clear liquid screens 112 at both ends of the clear liquid flow channel 150 are sealed by glue, which can provide support for the membrane cylinder 100 and improve the flowability of the clear liquid on the surface of the water collecting pipe 200, so that the clear liquid can flow into the water collecting pipe 200 quickly.

[0076] The water body to be treated flows between the adjacent membrane bags 110 under the guide of the concentrated water screen 120, and the clear liquid (or pure water) enters the inside of the membrane bag 110 after passing through the membrane sheet 111 due to the physical interception of the membrane sheet 111, and then is discharged to the middle part of the membrane cylinder 100 under the guide of the clear liquid screen 112. 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 formed in the pipe wall of the water collecting pipe 200 and is discharged.

[0077] Figure 2 It is a structural schematic view of a single membrane bag in the roll type membrane element.

[0078] As shown in Figure 2 , the membrane bag 110 is bag-shaped and generally rectangular, and the edges of the membrane bag 110 except the opening end are bonded by the bonding layer 1110 of the edges of the overlapped membrane sheets 111, and the bonding layer 1110 along the radial direction of the membrane cylinder 100 forms the sealing section 130 at both ends of the membrane cylinder 100 after winding, and the multiple clear liquid screens 112 at both ends of the clear liquid flow channel 150 are sealed as the sealing part 140 inside the sealing section 130 by glue. In another embodiment, the outer side of the bonding layer 1110 also has a small amount of membrane sheets 111 which are not completely bonded.

[0079] Figure 3 It is a front view of the roll type membrane element. Figure 4 It is a sectional view of A-A direction of Figure 3 . Figure 5 It is a sectional view of B-B direction of Figure 3 . Figure 6 It is another sectional view of B-B direction of Figure 3 .

[0080] The first embodiment of the roll type membrane element of the utility model is as shown in Figure 3-6 , the roll type membrane element comprises a membrane cylinder 100 (an expanded state is shown inFigure 1 The radial fixing structure comprises support rods 500 inlaid along the radial direction of the membrane cylinder 100, and the support rods 500 are 10 metal rods uniformly distributed along the circumferential direction of the membrane cylinder 100.

[0081] A preferred embodiment of the metal rod is a steel nail with a diameter of 0.2-1.5 cm, so that the fixing effect is good and the stability of the overall structure of the membrane element is less disturbed.

[0082] The steel nail extends 2-6 mm out of the outer surface of the membrane cylinder 100 along the radial direction of the membrane cylinder 100, and the part extending out of the membrane cylinder 100 can be shaped and smoothed when packaged with a glass shell, thereby ensuring a good fixing effect.

[0083] As shown in Figure 5 When the membrane cylinder 100 is provided with a water collecting pipe, the support rod 500 extends into the water collecting pipe 200 through the sealing part 140 along the radial direction of the membrane cylinder 100, and the inner end of the support rod 500 is 2.5-5 mm away from the inner surface of the water collecting pipe 200 (i.e. not penetrating the water collecting pipe 200). As shown in Figure 6 When the membrane cylinder 100 is not provided with a water collecting pipe, the support rod 500 extends into the sealing part 140 along the radial direction of the membrane cylinder 100, and the inner end of the support rod 500 is 1-2.5 mm away from the inner surface of the sealing part 140 (i.e. not penetrating the sealing part 140). In the above two ways, the inner end of the support rod 500 is inserted into the sealing part 140, so that not only the fixing effect is good, but also the flow sealing of the clear liquid and the concentrated water is ensured.

[0084] The radial fixing structure and the clear liquid cavity 113 should be independent of each other, so the radial fixing structure is arranged in the sealing section 130 or located at the outer end of the sealing section 130 (as shown in the drawing, the radial fixing structure is arranged in the sealing section 130), so as not to affect the filtering process and the flow sealing of the clear liquid and the concentrated water.

[0085] The preparation method of the spiral-wound membrane element of the embodiment comprises the following steps:

[0086] The axial ends of the membrane cylinder 100 wound by the membrane bag 110 are fixed, and then holes are drilled along the radial direction of the membrane cylinder 100 at the axial ends of the membrane cylinder 100.

[0087] The support rods 500 are inlaid into the holes, and the spiral-wound membrane element is obtained.

[0088] Figure 7 The structure diagram of the processing tooling used for the spiral-wound membrane element of the utility model.

[0089] As shown in Figure 7As shown, the processing tool used in the preparation method of the roll-type membrane element of the present embodiment includes a fixing part, a drilling part, a jacking 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 fixed ends of the membrane cylinder 100. The jacking part is used to jack the support rods 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 rods 500.

[0090] The fixing part includes support seats 611 arranged at the two ends of the membrane cylinder 100, an axial telescopic rod 612 arranged at one end of the membrane cylinder 100, and an axial cylinder 613 used to drive the axial telescopic rod 612 to extend and retract.

[0091] 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, wherein the first motor 622 is arranged on the support frame 624, the drill bit is arranged downward, and the lifting mechanism 623 is a screw lifting mechanism 623.

[0092] The jacking part has a radial telescopic rod 631 matched with the size of the support rod 500, and a radial cylinder 632 arranged on the side of the support seat 611 and used to drive the radial telescopic rod 631 to extend and retract.

[0093] The rotating part includes rotating wheels 641 arranged on the axial sides of the membrane cylinder 100, and a second motor 642 used to drive the rotating wheels 641 to rotate, wherein the rotating wheels 641 are fixed between the support seats 611.

[0094] The clamping part includes clamping jaws 650 arranged above the jacking part and used to clamp the support rods 500.

[0095] In specific operation, first, the membrane cylinder 100 is placed on the two rotating wheels 641, the axial telescopic rod 612 is driven by the axial cylinder 613 to extend and retract, and then the membrane cylinder 100 is fixed between the support seats 611 and the axial telescopic rod 612. Then, the first motor 622 and the drill bit 621 are driven by the lifting mechanism 623 to move downward, and when the drill bit 621 drills holes to the required depth at the end of the membrane cylinder 100, the first motor 622 and the drill bit 621 are driven by the lifting mechanism 623 to move upward. Then, the membrane cylinder 100 is rotated by a certain angle by the rotating wheels 641, and the support rods 500 clamped by the clamping jaws 650 are put into the drilled holes by the clamping part. Then, the membrane cylinder 100 is rotated by a certain angle again by the rotating wheels 641, the radial telescopic rod 631 is driven by the radial cylinder 632 to extend and retract, and then the support rods 500 are completely embedded into the drilled holes. The above operation is repeated, and after the embedding of the 10 support rods 500 at one end of the membrane cylinder 100 is completed, the membrane cylinder 100 is turned over, and then the support rods 500 are installed at the other end of the membrane cylinder 100, i.e., the installation of the radial fixing structure is completed.

[0096] Figure 8 It is a structure schematic view of the water collecting pipe 200 in the roll type membrane element of the utility model. Figure 9 It is another structure schematic view of the water collecting pipe 200 in the roll type membrane element of the utility model.

[0097] The second embodiment of the roll type membrane element of the utility model is as shown in Figure 3-6 8-9, on the basis of the first embodiment, the roll type membrane element further comprises 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 with the water collecting pipe 200, the water collecting pipe 200 is provided with a through hole 210 in communication with the opening edge of the membrane bag 110; the surface of the water collecting pipe 200 is further provided with a clear liquid flow guide channel, and the clear liquid flow guide channel comprises at least one of a spiral flow guide channel 220, an axial flow guide channel 230 and a ring-shaped flow guide channel 250.

[0098] The spiral flow guide channel 220 is in the shape of a cylindrical spiral line, the axial flow guide channel 230 is a plurality of and is arranged in parallel at equal intervals in the circumferential direction of the water collecting pipe 200, and the ring-shaped flow guide channel 250 is a plurality of and is arranged in parallel at equal intervals in the axial direction of the water collecting pipe 200, so that the flow path of the clear liquid is more abundant, and the flow resistance is smaller.

[0099] Preferably, as shown in Figure 8 The clear liquid flow guide channel is composed of the spiral flow guide channel 220 and the axial flow guide channel 230, or, as shown in Figure 9 The clear liquid flow guide channel is composed of the axial flow guide channel 230 and the ring-shaped flow guide channel 250, so that the flow path of the clear liquid is more abundant, and the flow resistance is smaller.

[0100] The through hole 210 is arranged on the spiral flow guide channel 220 or the ring-shaped flow guide channel 250 between the adjacent two axial flow guide channels 230, so that the clear liquid can flow into the through hole 210 quickly.

[0101] The cross-sectional width of the clear liquid flow guide channel is 1-8mm, and the depth is 1-5mm, so that the good flowability of fresh water is ensured, and the water collecting pipe 200 retains higher strength to support the membrane cylinder 100.

[0102] The third embodiment of the roll type membrane element of the utility model is as shown in Figure 3-4 On the basis of the second embodiment, the roll type membrane element further comprises an axial fixing structure for fixing the axial two ends of the membrane cylinder 100, the axial fixing structure comprises an end cover 300, and the membrane bag 110 is fixed by the end cover 300 after being wound into the membrane cylinder 100 in the circumferential direction of the water collecting pipe 200.

[0103] The traditional connection mode of the water collecting pipe 200 and the end cover 300 is adhesion, and the adhesion strength is poor, and the performance of the adhesive is easy to fail in a long-term soaking process. In the embodiment, the two ends of the water collecting pipe 200 are provided with external threads 240, and the center hole of the end cover 300 is provided with external threads 240, so that the water collecting pipe 200 and the end cover 300 are threadedly connected. Compared with the traditional adhesion mode, the threaded connection can significantly improve the connection strength of the water collecting pipe 200 and the end cover 300, and further improve the structural stability of the membrane element.

[0104] The fourth embodiment of the roll type membrane element of the utility model is as follows: Figure 3-6 , 8-9, the roll type membrane element comprises the membrane cylinder 100, the radial fixing structure, the water collecting pipe 200 and the axial fixing structure.

[0105] The beneficial effects of the roll type membrane element of the utility model are illustrated by experimental data as follows.

[0106] Firstly, the deformation degrees of the conventional roll type membrane element and the roll type membrane element of the embodiment under different water inflow are tested, wherein the water inflow is respectively set as 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 and 26 m 3 / h, the water inflow pressure is 120 bar, and the concentration of the liquid to be treated (NaCl solution) is respectively set as 200000 mg / L.

[0107] It is verified that the membrane cylinder 100 of the conventional roll type membrane element can not be deformed under the water inflow of ≤12 m 3 / h, but the membrane cylinder 100 gradually deforms with the increase of the water inflow, especially when the water inflow reaches 20 m 3 / h or above, the membrane cylinder 100 is severely deformed and a very obvious “telescope phenomenon” is generated. However, the roll type membrane element of the embodiment does not have the deformation phenomenon even if it works under the water inflow of 26 m 3 / h for a long time.

[0108] Then, the water production of the conventional roll type membrane element and the roll type membrane element of the embodiment under different working conditions is tested, wherein the water inflow pressures of the three working conditions are respectively set as 55, 90 and 120 bar, and the concentrations of the liquid to be treated (NaCl solution) are respectively set as 32000, 70000 and 100000 mg / L.

[0109] It is verified that under the three working conditions, the water production of the conventional roll type membrane element is respectively 1.14, 0.82 and 0.65 m 3 / h, and the water production of the roll type membrane element of the embodiment is respectively 1.21, 1.08 and 0.95 m 3 / h, it can be known from the comparison that the water production of the roll type membrane element in the embodiment is higher under the three working conditions, which indicates that the flowability of the clear liquid on the water collecting pipe 200 is better.

[0110] The embodiment of the roll type membrane water purification equipment of the utility model is the roll type membrane element described in any one of the above embodiments.

[0111] The embodiment of the water treatment method of the utility model is to filter the water body to be treated by using the roll type membrane element described in any one of the above embodiments, or to filter the water body to be treated by using the roll type membrane water purification equipment.

[0112] The related content of the utility model is described above. The ordinary skilled in the art can realize the utility model based on the description. Based on the above content of the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor shall belong to the protection scope of the utility model.

Claims

1. A spiral wound membrane element, comprising a membrane roll (100) formed by winding a membrane bag (110), characterized in that: It also includes a water collection pipe (200) for discharging 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) is provided with a through hole (210) that communicates with the opening edge of the membrane bag (110); The surface of the water collection pipe (200) is also provided with a clear liquid guiding channel, which 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.

2. The spiral wound membrane element as described in claim 1, characterized in that: 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).

3. The spiral wound membrane element as described in claim 1, 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).

4. The spiral wound membrane element as described in claim 3, characterized in that: 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).

5. The spiral wound membrane element as described in claim 1, characterized in that: The cross-sectional width of the clear liquid guiding channel is 1-8 mm, and the depth is 1-5 mm.

6. The spiral wound membrane element as described in claim 1, characterized in that: The membrane bag (110) is formed by winding at least two membrane bags (110), and a concentrate separator (120) is provided between two adjacent membrane bags (110).

7. The spiral wound membrane element as described in claim 1, characterized in that: It also includes an axial fixing structure for fixing the two ends of the membrane tube (100) in the axial direction. The axial fixing structure includes end caps (300). 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).

8. The spiral wound membrane element as described in claim 7, characterized in that: The two ends of the water collection pipe (200) are threadedly connected to the end cap (300).

9. A spiral wound membrane water purification system, characterized in that: Includes the spiral wound membrane element as described in any one of claims 1-8.

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