Preparation method of multi-page type membrane element and multi-page type membrane element

Abstract

The invention relates to the technical field of water treatment equipment, in particular to a preparation method of a multi-page type membrane element and the multi-page type membrane element. The preparation method comprises the following steps that multiple membrane bags are grouped, and different membrane bags in each group are sequentially overlapped in a staggered mode in the winding direction; each group of film bags after staggered lap joint is used as a film inlet whole, and the film inlet whole enters the film and is wound on the outer side of the central pipe; after film feeding of the previous group of film bags is completed, film feeding of the other group of film bags is conducted, film feeding of the multiple groups of film bags is conducted in sequence, and after the film bags of all the groups are fixed after film feeding, overall winding of the film bags on the central pipe is conducted; winding waterproof adhesive tape, and cutting the film bags at two ends of the central pipe. By optimizing the membrane feeding method of the membrane bag, the performance of the filter element is more stable, the continuous and stable production process is ensured, and the efficiency and the yield are improved.

Description

Technical Field

[0001] This application relates to the field of water treatment equipment technology, and more specifically, to a method for preparing a multi-page membrane element and the multi-page membrane element itself. Background Technology

[0002] During the filter cartridge manufacturing process, the membrane sheets need to be evenly distributed around the central tube at 360° to ensure that the permeate water can be fully discharged through the water collection holes on the central tube. The main operation involves placing a membrane bag close to the central tube, applying adhesive, and then rotating the central tube at a certain angle to roll the membrane bag inward, which is called "membrane insertion" and also serves to fix the membrane bag. The above process is repeated to insert all the membrane bags, and finally, waterproof tape is wrapped around them, and they are set aside to wait for the adhesive to cure before being cut.

[0003] In recent years, household high-flow filter cartridges have gradually become the mainstream in the market due to their characteristics such as high water production, strong anti-fouling properties, long service life, and reduction of secondary water pollution. To increase the water production of a filter cartridge, the membrane area needs to be increased, i.e., the number of membrane sheets needs to be increased.

[0004] However, during the filter element preparation process, high-flow filter elements have a large number of membrane sheets. During the membrane insertion process, the small rotation angle of the central tube makes it difficult to insert the membrane. Often, due to the large number of membrane sheets, the membrane bags are not inserted into the membrane or are inserted insufficiently. They are not fixed and are stacked near the central tube, causing problems such as membrane bag slippage and deviation, which affect the filter element performance and reduce the preparation efficiency and yield. Summary of the Invention

[0005] The purpose of this application is to provide a method for preparing a multi-page membrane element and a multi-page membrane element, which can optimize the membrane bag insertion method to make the filter element performance more stable, ensure continuous and stable production process, and improve efficiency and yield.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a method for preparing a multi-page membrane element, comprising the following steps: Multiple film bags are grouped together, and different film bags in each group are staggered and overlapped sequentially along the winding direction. Each group of film bags after staggered overlap is treated as a whole for film insertion, so that the whole film insertion is inserted into the film and wound around the outside of the central tube. After the previous set of film bags is inserted, another set of film bags is inserted, and so on, until all sets of film bags are inserted and fixed, and then wound as a whole on the central tube. Wrap waterproof tape around the tube and cut the membrane bags at both ends of the central tube.

[0007] In an optional embodiment, each of the membrane bags includes a membrane sheet of the same size and a concentrate flow channel cloth, wherein the membrane sheet is staggered and the concentrate flow channel cloth is sandwiched in the staggered membrane sheet.

[0008] In an optional embodiment, each of the membrane sheets is folded in a staggered manner with two sides of the same length, and the folded short side of the membrane sheet is positioned below the folded long side.

[0009] In an optional embodiment, each of the membrane bags further includes a pure water flow channel cloth of the same size, which is disposed above the membrane sheet.

[0010] In an optional implementation, adjacent film bags in each group are staggered and overlapped sequentially at the same distance. The film bag at the beginning of the film insertion is placed at the bottom of each group of film bags, and the remaining film bags are staggered and overlapped sequentially from bottom to top and back.

[0011] In an optional implementation, the number of film bags in each group may be the same or different, and the insertion angle of each group of film bags corresponds to the product of the number of film bags in that group and the angle of rotation of all film bags.

[0012] In an optional embodiment, the pure water flow channel cloth and membrane sheet in each membrane bag are bonded together with adhesive and form an independent membrane bag unit with the concentrated water flow channel cloth. Each group of different film bags is bonded together with adhesive to form an independent film insertion unit.

[0013] In an optional embodiment, the central tube rotates intermittently under the drive of a drive motor to feed and wind different groups of film bags.

[0014] In an optional embodiment, the drive motor rotates under the control of a control system, which is electrically connected to a position sensor for detecting the movement distance of the film bag.

[0015] Secondly, the present invention provides a multi-page membrane element, which is prepared by the method for preparing a multi-page membrane element as described in any of the foregoing embodiments.

[0016] The method for preparing multi-page membrane elements in this invention allows for the appropriate grouping of multiple membrane bags. Each group of membrane bags is treated as a single membrane insertion unit and inserted together. After multiple membrane insertion units are inserted, all membrane bags are wound together. The rotation angle of the central tube during insertion is greater than that of a single membrane bag, allowing each group of membrane bags to be inserted more fully during the insertion stage. This ensures that the membrane bags are stably and reliably fixed on the central tube, thereby improving the performance stability of the multi-page membrane element, making the production process continuous and stable, and increasing preparation efficiency and yield.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram showing the staggered overlap between different film bags in this application.

[0020] icon: 1-Membrane sheet; 2-Concentrate flow channel cloth; 3-Pure water flow channel cloth. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] The method for preparing multi-page membrane elements in this application is mainly to make different membrane bags more stable during the membrane insertion stage.

[0025] In the existing technology, during the preparation of filter membrane elements, a single membrane bag is generally placed close to the central tube and inserted into the membrane to complete the stage of fixing the membrane bag. Since the area of ​​the membrane bag corresponding to the insertion is small, the rotation angle of the central tube is extremely small during insertion. Based on this, when preparing multi-page membrane elements, due to the large number of membrane bags, the situation often occurs where the membrane bag is not inserted or is not inserted sufficiently because there are too many membrane sheets.

[0026] This application optimizes the film insertion stage by changing the insertion of individual film sheets 1 corresponding to smaller rotation angles to the insertion of multiple film sheets 1 in groups corresponding to larger rotation angles. This ensures that each group of film bags is inserted more fully during the film insertion stage, thereby reliably fixing different film bags on the central tube.

[0027] The method for preparing the multi-page membrane element in this invention mainly includes the following steps: First, each membrane bag is cut and processed to produce individual membrane bags of the same structural size, which are then glued together and set aside for later use.

[0028] Then, the multiple membrane bags are grouped. The membrane bags corresponding to the filter element that need to be wound are evenly divided into multiple groups of the same number, or into multiple groups of different numbers in each group. After grouping, the different membrane bags in each group are staggered and overlapped in sequence along the winding direction. At the same time, the different membrane bags are bonded together while staggering and overlapping.

[0029] After being glued with staggered overlap, each group of film bags forms the starting end for film insertion. Each group of film bags after staggered overlap and gluing is treated as a whole for film insertion. Multiple different wholes of film insertion are fixed separately for film insertion, and the whole group of film bags is wound after all groups of film bags are fixed for film insertion.

[0030] After all groups of film bags are inserted into the film as a whole and the different film bags are fixed, they are wound as a whole. During the winding process, the winding tightening force can glue the different film bags together as a whole and fix them to the outside of the central tube.

[0031] Specifically, after a set of film bags is inserted, the overlapping step at the beginning of the insertion is pressed tightly against the outside of the central tube, and then the insertion of the next set of film bags is carried out.

[0032] Place the starting end of another set of film bags that need to be inserted into the central tube tightly against the central tube, and insert the other set of film bags. Repeat this process for multiple sets of film bags until all sets of film bags have been inserted into the central tube. Then, wind and fix all sets of film bags onto the central tube.

[0033] After the membrane bag is wound and fixed, waterproof tape is wrapped around its outside. After the adhesive has cured, the membrane bag at both ends of the central tube is cut to complete the preparation of the multi-page membrane element.

[0034] The multi-page membrane element preparation method of the present invention enables the insertion of multiple membrane bags into each group at a larger rotation angle of the central tube. Compared with inserting each membrane bag independently, it can avoid the situation of no insertion or insufficient insertion caused by a smaller insertion rotation angle.

[0035] Combination Figure 1 In one specific embodiment, from the perspective of the structural composition of each membrane bag, each membrane bag includes a membrane sheet 1 of the same size and a concentrate flow channel cloth 2. The membrane sheet 1 is folded in a staggered manner with the long and short sides on the basis of the same width, and the concentrate flow channel cloth 2 is sandwiched in the staggered folded membrane sheet 1.

[0036] Specifically, each membrane sheet 1 in each membrane bag is folded with the same length on both sides in a staggered manner. Furthermore, the folded short side of membrane sheet 1 is set below the folded long side. This arrangement facilitates the successive connection of membrane bags from different groups.

[0037] Each membrane bag also includes a pure water channel cloth 3 of the same size, which is placed above the membrane sheet 1. Through the layered arrangement of the membrane sheet 1, the concentrate channel cloth 2 and the pure water channel cloth 3, the layered structure of each membrane bag can be formed, so that the filter element is formed into a cylindrical shape after being inserted into the membrane and wound.

[0038] From the perspective of forming a good connection, adjacent membrane bags in each group are staggered and overlapped at the same distance. The membrane bag at the beginning of the membrane insertion is placed at the bottom of each group of membrane bags, and the remaining membrane bags are staggered and overlapped from bottom to top and back. This can form an overlap step at the beginning of the membrane insertion of each group of membrane bags, and facilitate the insertion of the next group of membrane bags with the same overlap step, ensuring that all membrane bags have a uniform thickness on the outside of the central tube.

[0039] In this invention, the number of film bags in each group may be the same or different, and the insertion angle of each group of film bags corresponds to the product of the number of film bags in that group and the average rotation angle of all film bags.

[0040] Specifically, taking one filter cartridge with eight membrane sheets 1, i.e., eight membrane bags, as an example, the eight membrane bags are divided into two groups, each group including four membrane bags. The number of membrane bag groups can be appropriately increased according to the increase of the number of filter cartridge membrane sheets 1. One group of membrane bags is regarded as a whole for membrane insertion and inserted into the membrane. At this time, the central tube is rotated 180° when inserting the membrane. After the 180° rotation is completed and the membrane insertion is fixed, the central tube continues to rotate to complete the winding and fixing of the group of membrane bags.

[0041] Taking one filter element with nine membrane sheets (i.e., nine membrane bags) as an example, if they are divided into three groups, each group containing three membrane bags, the central tube rotates 120° when each group of membrane bags is inserted into the membrane. After all three groups of membrane bags are inserted and wound, waterproof tape is wrapped around them.

[0042] Similarly, if the membrane bags are divided into four groups, the central tube will rotate 90° when each group of membrane bags is inserted into the membrane.

[0043] Besides the above-mentioned case where the number of membrane bags in each group is the same due to equal distribution, the number of membrane bags in each group can also be different. Taking 1 filter element with 9 membrane sheets (i.e., 9 membrane bags) as an example, if it is divided into two groups, one group includes 5 membrane bags and the other group includes 4 membrane bags, the insertion angle of each group of membrane bags corresponds to the angle of the product of the number of membrane bags in that group and the rotation angle of all membrane bags. The required insertion rotation angle for each membrane bag in the 9 membrane bags is 40°. Therefore, when inserting the membrane bag into the group with 5 membrane bags, the central tube rotates 200°. When inserting the membrane bag into the group with 4 membrane bags, the central tube rotates 160°. This is how to complete the insertion of membrane bags into different groups with different numbers of membrane bags.

[0044] By using the above-mentioned film insertion method, it is possible to ensure that different groups of film bags are inserted evenly and that all film bags are effectively fixed.

[0045] Based on the adhesive bonding of different membrane layers in a single membrane bag as described above, and the adhesive bonding and fixing of different membrane bags in a single group of membrane bags, the pure water flow channel fabric 3 and membrane sheet 1 in each membrane bag in a single group are bonded together with adhesive and stacked with the concentrate flow channel fabric 2 to form each independent membrane bag unit; Different film bags in a single group are bonded together with adhesive to form an independent film insertion unit.

[0046] The method for preparing multi-page membrane elements in this invention can effectively make the membrane insertion and fixing process of each group of membrane bags more thorough, and can make each membrane bag firmly and stably wound and fixed, greatly improving the preparation conditions of existing membrane elements.

[0047] From the angle of rotation of the central tube, the central tube rotates intermittently under the drive of the drive motor to perform film feeding of different groups of film bags and overall winding.

[0048] Meanwhile, the drive motor rotates under the control of the control system, which is electrically connected to a position sensor. The position sensor is used to detect the movement distance of the film bag. Given the equidistant staggered overlap between different film bags and the fact that all film bags are of the same size, the position sensor can detect the movement distance of the film bag in real time to determine the film bag's insertion and winding status, thereby achieving automated film insertion and winding processes.

[0049] This invention also provides a multi-page membrane element, which is prepared by the method described above. Taking one filter element with eight membrane sheets 1, i.e., eight membrane bags, as an example, the main preparation process is as follows: 1) Assemble the cut membrane sheet 1, pure water flow channel cloth 3, and concentrated water flow channel cloth 2 into a membrane bag according to the state described above, apply glue, and place it. 2) Assemble the second film bag. After applying glue to the second film bag, move it above the first film bag and stack it backwards at a certain distance. 3) Repeat step 2) until all 4 film bags are placed. Use the machine grippers to move the 4 film bags together to the central tube. Place the head end of the film bags tightly against the central tube and rotate the central tube 180° to complete the film insertion. 4) Repeat steps 1), 2), and 3) to complete the insertion of the second group of film bags. Then, roll up all the film bags in all groups and wrap them with waterproof tape. Set them aside and wait for the adhesive to cure before cutting.

[0050] The multi-page membrane element prepared by the method of the present invention, preferably the multi-page filter element, makes the filter element performance more stable, the production process is continuous and stable, and improves the preparation efficiency and yield.

[0051] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing a multi-page membrane element, characterized in that, Includes the following steps: Multiple film bags are grouped together, and different film bags in each group are staggered and overlapped sequentially along the winding direction. Each group of film bags after staggered overlap is treated as a whole for film insertion, so that the whole film insertion is inserted into the film and wound around the outside of the central tube. After the previous set of film bags is inserted, another set of film bags is inserted, and so on, until all sets of film bags are inserted and fixed, and then wound as a whole on the central tube. Wrap waterproof tape around the tube and cut the membrane bags at both ends of the central tube.

2. The method for preparing a multi-page membrane element according to claim 1, characterized in that, Each of the membrane bags includes a membrane sheet of the same size and a concentrate flow channel fabric, wherein the membrane sheet is folded in an offset manner and the concentrate flow channel fabric is sandwiched in the folded membrane sheet.

3. The method for preparing a multi-page membrane element according to claim 2, characterized in that, Each of the membrane sheets is folded with its two sides of the same length offset, with the folded short side of the membrane sheet positioned below the folded long side.

4. The method for preparing a multi-page membrane element according to claim 2, characterized in that, Each of the membrane bags also includes a pure water flow channel cloth of the same size, which is disposed above the membrane sheet.

5. The method for preparing a multi-page membrane element according to claim 2, characterized in that, Adjacent membrane bags in each group are staggered and overlapped sequentially at the same distance. The membrane bag at the beginning of the membrane insertion is placed at the bottom of each group of membrane bags, and the remaining membrane bags are staggered and overlapped sequentially from bottom to top and back.

6. The method for preparing a multi-page membrane element according to claim 2, characterized in that, The number of film bags in each group may be the same or different, and the insertion angle of the film bags in each group corresponds to the product of the number of film bags in that group and the average rotation angle of all film bags.

7. The method for preparing a multi-page membrane element according to claim 4, characterized in that, The pure water flow channel cloth and membrane sheet in each membrane bag are bonded together with adhesive, and together with the concentrated water flow channel cloth, they form an independent membrane bag unit. Each group of different film bags is bonded together with adhesive to form an independent film insertion unit.

8. The method for preparing a multi-page membrane element according to claim 1, characterized in that, The central tube rotates intermittently under the drive of the motor to feed and wind different groups of film bags.

9. The method for preparing a multi-page membrane element according to claim 8, characterized in that, The drive motor rotates under the control of the control system, which is electrically connected to a position sensor. The position sensor is used to detect the moving distance of the film bag.

10. A multi-page membrane element, characterized in that, The multi-page membrane element is prepared by the method for preparing a multi-page membrane element according to any one of claims 1-9.

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