A regularly arranged curtain-type membrane module, a preparation method thereof, and an automatic perfusion device used therefor

Abstract

The present invention relates to the technical field of membrane separation water treatment, and particularly relates to and discloses a regularly arranged curtain-type membrane module, which includes a collecting water pipe and a plurality of hollow fiber membrane sheets. The hollow fiber membrane sheets are regularly arranged through a soft glue layer, and further includes an encapsulation layer. The encapsulation layer encapsulates a plurality of hollow fiber membrane sheets together with all or part of the soft glue layer in the collecting water pipe, and the water outlet end of the hollow fiber membrane sheet is located outside the soft glue layer and the encapsulation layer. The present invention also discloses a preparation method of the curtain-type membrane module, which includes steps of membrane sheet clamping, membrane sheet positioning, membrane sheet gluing, and membrane sheet through-hole. The present invention also discloses an automatic perfusion device used for implementing the above method. The glue of the present invention can flow quickly and bond all the membrane filaments, and does not block the water outlet of the hollow fiber membrane, greatly simplifying the glue filling and encapsulation process, improving the integrity and anti-pollution property of the membrane module, and having the advantages of simple process, high automation degree, high production efficiency, good product quality, and low production cost.

Description

Technical Field

[0001] The invention relates to the technical field of membrane separation water treatment, and in particular to a regularly arranged curtain-type membrane component, a preparation method and an automatic filling device used for implementing the preparation method. Background Art

[0002] Hollow fiber curtain membrane bioreactor is a new water treatment technology that combines a hollow fiber membrane separation unit with a biological treatment unit. It replaces the secondary sedimentation tank with a hollow fiber curtain membrane module and maintains a high active sludge concentration in the biochemical reactor to reduce the land occupation of sewage treatment facilities and reduce the amount of sludge by maintaining a low sludge load. Compared with traditional biochemical water treatment technology, it has the characteristics of high treatment efficiency, good effluent quality, compact equipment, small footprint, easy automatic control, and simple operation and management. It has been widely used in sewage treatment in the fields of municipal administration, power, steel, petrochemical, textile, food, etc.

[0003] In the preparation process of hollow fiber curtain membrane modules, a large number of hollow fiber membrane ends must be fixed in the water collection pipe and potted into modules so that the outer surface of the membrane is completely sealed relative to the outside of the water collection pipe, but the hollow inner hole of the membrane is open relative to the inner cavity of the water collection pipe. After that, the water collection pipe is connected to the pump through a pipeline, and a transmembrane pressure difference is formed through negative pressure suction or a pressure source to achieve membrane separation.

[0004] The existing preparation method of hollow fiber curtain membrane is mainly to naturally spread out the bundled membrane filaments, then use a clamp to arrange them into sheets, and finally fill them with glue for packaging. There are many packaging process procedures, including primary packaging, head cutting, bonding the packaging box and the water collection box, secondary packaging, and adding soft glue. The use of the packaging box reduces the filling area of ​​the hollow fiber membrane in the water supply pipe. In addition, this packaging method has high requirements on the fluidity of the glue. The glue filling and packaging of the bundled membrane filaments is prone to uneven glue penetration and poor flow. The disordered scattered membrane bundles will hinder the flow of glue, the glue injection speed is slow, and the production efficiency is low. Finally, when the membrane filaments are clamped into sheets for glue filling and packaging, the packaging method of manually assisted dispersion of the membrane filaments has high requirements on manual consistency and the quality is difficult to guarantee.

[0005] Existing curtain films and their preparation methods have the following disadvantages:

[0006] 1. The membrane filaments are arranged in disorder, and the membrane filaments are prone to mud accumulation during actual use, and the anti-pollution ability is low;

[0007] 2. The packaging process of membrane filaments is multi-step, the production efficiency is low, and the product quality is unstable;

[0008] 3. After the film is filled with glue and packaged, the glue is prone to uneven flow and inadequate flow, resulting in a high rate of defective products;

[0009] 4. Labor costs are high and production quality cannot be guaranteed. Summary of the Invention

[0010] Aiming at the defects existing in the prior art, the present invention provides a curtain-type membrane with regular arrangement, where glue can flow quickly and bond all membrane filaments during potting encapsulation, without blocking the water outlet of the hollow fiber membrane, greatly simplifying the potting encapsulation process, enhancing the integrity and anti-pollution ability of the membrane module, and having high production efficiency, its preparation method, and an automatic perfusion device for implementing the preparation method.

[0011] To achieve the above invention purpose, the present invention adopts the following technical solutions:

[0012] A curtain-type membrane module with regular arrangement, including a water collecting pipe and a plurality of hollow fiber membrane sheets. The hollow fiber membrane sheets are regularly arranged through a soft glue layer, and further includes a potting layer. The potting layer potting a plurality of hollow fiber membrane sheets together with all or part of the soft glue layer in the water collecting pipe. The water outlet end of the hollow fiber membrane sheet is located outside the soft glue layer and the potting layer. The membrane filaments are regularly arranged and are not prone to sludge accumulation during use, with strong anti-pollution ability. The soft glue layer allows the membrane filaments to move during use, better withstand the impact force, and will not cause the membrane filaments to break due to the impact force.

[0013] Preferably, the potting layer is divided into an upper potting layer and a lower potting layer. The upper potting layer is far from the water outlet end of the hollow fiber membrane sheet, and the hardness of the upper potting layer is less than 60 Shore A. When the height of the soft glue layer is small and the material of the hollow fiber membrane sheet is prone to brittle fracture, potting in two layers not only ensures the hardness requirement of the lower potting layer but also makes the hardness of the upper potting layer smaller, allowing the membrane filaments to move during use, better withstand the impact force, and will not cause the membrane filaments to break due to the impact force.

[0014] Preferably, the height of the potting layer is 10 - 80 mm, the depth of the soft glue layer embedded in the potting layer is 3 - 20 mm, the length of the hollow fiber membrane sheet outside the potting layer 4 is 3 - 20 mm, and the distance between the water outlet of the hollow fiber membrane sheet and the bottom of the water collecting pipe is 2 - 15 mm.

[0015] Preferably, the potting layer material is one or two of urea formaldehyde resin, polyvinyl acetate resin, polyacrylic acid resin, polyurethane, epoxy resin, or silicone.

[0016] Preferably, the hollow fiber membrane sheet is regularly arranged by 10 - 2000 hollow fiber membranes with a length of 0.1 - 3 m. The distance between adjacent two membrane filaments is 0.1 - 10 mm. The stacking layer number of the hollow fiber membrane sheet is 1 - 60 layers. The height of the soft glue layer is 1 - 50 mm, and the thickness is 0.2 - 5 mm. The soft glue layer material is one of ethylene-vinyl acetate copolymer, styrene block elastomer, polyolefin, polyamide, or polyester.

[0017] Preferably, it further includes clamping blocks, which are clamped outside the soft rubber layer. The clamping blocks are encapsulated in the water collecting pipe by the encapsulating layer or are independent of the encapsulating layer. When the height of the soft rubber layer is small, the clamping blocks will be encapsulated in the water collecting pipe to ensure continuous positioning. When the height of the soft rubber layer is high, the clamping blocks can be independent of the encapsulating layer and can be removed for recycling after preparation.

[0018] A preparation method of a regularly arranged curtain-type membrane module includes the following steps:

[0019] 1) Membrane sheet clamping: Stack the two ends of several hollow fiber membrane sheets neatly into blocks and clamp them through clamping blocks. The hollow fiber membrane sheets have been regularly arranged by the gel of the soft rubber layer. The water outlets of the hollow fiber membrane sheets face downward and are located outside the soft rubber layer. Ensure the relative positions of the hollow fiber membrane sheets and the water collecting pipe by fixing the clamping blocks.

[0020] 2) Membrane sheet positioning: Use a support liquid injection device to inject the support liquid into the bottom of the water collecting pipe and let it stand and level. Then slowly insert the end of the clamped hollow fiber membrane sheet into the water collecting pipe and let it stand until the support liquid in the water collecting pipe is higher than the water outlet of the hollow fiber membrane sheet and levels, realizing that the support liquid submerges and plugs the holes. The use of the support liquid can protect the water outlets of the hollow fiber membrane sheets from being blocked by the encapsulating glue and make the bottom of the encapsulating glue flush.

[0021] 3) Membrane sheet glue injection: Use an automatic glue injection device to inject the encapsulating liquid at an appropriate encapsulating speed, and then let it stand and level and cure to form an encapsulating layer; the glue can flow quickly and bond all the membrane filaments.

[0022] 4) Membrane sheet through-hole: After the encapsulating layer is cured, let the support liquid in the water collecting pipe flow out to expose the through-holes at the water outlets of the hollow fiber membrane sheets.

[0023] The above steps can be carried out on the two ends of the hollow fiber membrane sheet respectively, or the hollow fiber membrane sheet can be bent into a U shape with both ends facing downward, and the above steps can be carried out simultaneously.

[0024] During encapsulation, the glue can flow quickly and bond all the membrane filaments, and does not block the water outlets of the hollow fiber membranes, greatly simplifying the glue injection and encapsulation process and improving the integrity and anti-pollution performance of the membrane module.

[0025] Preferably, in step 2), the top of the support liquid is 0 - 50 mm lower than the lower part of the soft rubber layer.

[0026] Preferably, in step 2), the room temperature viscosity of the support liquid is greater than 5000 mPa·s, and the material is a solution of one or two of polyvinylpyrrolidone, sodium polyacrylate, poly(methyl acrylate), methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, waterborne polyurethane, polysaccharide, polyethylene oxide, etc. Ensure that the support liquid 7 will not climb along the hollow fiber membrane sheet.

[0027] Preferably, the glue injection process in step 3) can be two - layer glue injection for the upper and lower layers, and the hardness of the liquid material for the upper - layer glue injection is less than that of the lower - layer liquid material.

[0028] An automatic perfusion device for a preparation method of a curtain - type membrane module with regular arrangement includes a first barrel group, a second barrel group, and several perfusion execution mechanisms. Each perfusion execution mechanism includes a first metering device, a second metering device, a mixing glue gun, a multi - point injector, and a perfusion displacement device. The outlets of the first metering device and the second metering device are both connected to the inlet of the mixing glue gun, the outlet of the mixing glue gun is connected to the multi - point injector, the perfusion displacement device is connected to the multi - point injector, and the inlets of the first metering device and the second metering device are respectively connected to the outlets of the first barrel group and the second barrel group.

[0029] The barrel is used to store the liquid material; the metering device is used to control the injection speed and dosage of the liquid material; the mixing glue gun is used to control the opening and closing of the perfusion execution mechanism and mix the multi - component raw materials provided by different metering devices evenly; the multi - point injector is used to disperse the liquid material to different positions, and the perfusion displacement device can move the multi - point injector to a preset working station for perfusion. It can be used for the injection of support liquid and potting liquid.

[0030] Preferably, the first barrel group and the second barrel group each have 1 - 2 barrels. The barrels of the first barrel group are all connected to the first metering device, and the barrels of the second barrel group are all connected to the second metering device. Setting multiple barrels can switch barrels when needed to ensure continuous feeding.

[0031] Preferably, the number of the perfusion execution mechanisms is 1 - 10. It can cope with the situation where multiple simultaneous perfusions are required.

[0032] Preferably, the number of points of the multi - point injector can be divided into 2 - 10, and each point has a separate adjustable flow channel. By adjusting the size of the flow channel, different liquid material amounts can be distributed. The first metering device and the second metering device can have multi - stage non - uniform liquid discharge. They can be adjusted separately as required to achieve self - leveling and rapid uniformity of the liquid.

[0033] Preferably, when perfusion the support liquid, the first barrel group and the second barrel group can respectively inject support liquids with different viscosities; when perfusion the potting liquid, the first barrel group and the second barrel group can respectively inject different components of the potting liquid. The used support liquid can be returned to the barrel to form a circulating use of support liquids with different viscosities. The double - barrel group is convenient for the use of two - component potting liquid.

[0034] A regularly arranged curtain - type membrane module, a preparation method thereof, and an automatic perfusion device used for implementing the preparation method. After neatly stacking the regularly arranged hollow fiber membrane sheets with soft glue layers, supporting the liquid flow to level and temporarily block the water outlet, pouring glue, and restoring the water outlet, the glue can flow quickly and bond all the membrane filaments, and does not block the water outlet of the hollow fiber membrane, greatly simplifying the glue - pouring and encapsulation process, and improving the integrity and anti - fouling property of the membrane module. It has the advantages of simple process, high automation degree, effectively improving production efficiency, enhancing product quality, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 FIG. 1 is a schematic structural diagram of a regularly arranged curtain - type membrane module according to Embodiment 1 of the present invention.

[0036] Figure 2 FIG. 2 is a schematic structural diagram of a hollow fiber membrane sheet with a soft glue layer according to Embodiment 1 of the present invention.

[0037] Figure 3 FIG. 3 is a schematic preparation diagram of a regularly arranged curtain - type membrane module according to Embodiment 1 of the present invention.

[0038] Figure 4 FIG. 4 is a schematic structural diagram of an automatic perfusion device according to Embodiment 1 of the present invention.

[0039] Figure 5 FIG. 5 is a schematic preparation diagram of a regularly arranged curtain - type membrane module according to Embodiment 2 of the present invention.

[0040] Figure 6 FIG. 6 is a schematic preparation diagram of a regularly arranged curtain - type membrane module according to Embodiment 3 of the present invention.

[0041] In the figure: 1, water collecting pipe; 2, hollow fiber membrane sheet; 3, soft glue layer; 4, encapsulation layer; 5, clamping block; 6, automatic perfusion device; 7, supporting liquid; 9, first barrel group; 10, second barrel group; 11, perfusion execution mechanism; 12, first metering device; 13, second metering device; 14, mixing glue gun; 15, multi - point syringe; 16, perfusion displacement device; 17, barrel; 41, lower encapsulation layer; 42, upper encapsulation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The present invention will be further described below in conjunction with FIGS. 1 - 6 and the specific embodiments.

[0043] Embodiment 1

[0044] A regularly arranged curtain - type membrane module, as shown in the attached... Figure 1 figure, includes a water collecting pipe 1 and a number of hollow fiber membrane sheets 2, as shown in the attached... Figure 2As shown, the hollow fiber membranes 2 are regularly arranged through the soft glue layer 3. There is also an encapsulation layer 4. The encapsulation layer 4 encapsulates several hollow fiber membranes 2 together with a part of the soft glue layer 3 in the water collecting pipe 1. The outlet ends of the hollow fiber membranes 2 are located outside the soft glue layer 3 and the encapsulation layer 4.

[0045] The hollow fiber membranes 2 are made of PVDF hollow fiber homogeneous membrane filaments prepared by the thermally induced phase separation method. Each hollow fiber membrane 2 is formed by regularly arranging 200 hollow fiber membrane filaments with a diameter of 1.3 mm and a length of 1 m. The distance between adjacent two membrane filaments is 0.7 mm. The stacking layer number of the hollow fiber membranes 2 is 12 layers. The height of the soft glue layer 3 is 40 mm and the thickness is 2.7 mm. The material of the soft glue layer 3 is ethylene-vinyl acetate copolymer.

[0046] The height of the encapsulation layer 4 is 45 mm. The depth that the soft glue layer 3 is embedded in the encapsulation layer 4 is 15 mm. The length of the hollow fiber membranes 2 located outside the encapsulation layer 4 is 15 mm. The distance between the outlet of the hollow fiber membranes 2 and the bottom of the water collecting pipe 1 is 10 mm.

[0047] The material of the encapsulation layer 4 is a two-component epoxy resin, including two components: epoxy resin main agent and epoxy resin curing agent.

[0048] A preparation method of a regularly arranged curtain-type membrane module includes the following steps:

[0049] 1) Membrane clamping: Stack the two ends of several hollow fiber membranes 2 neatly into blocks and clamp them through the clamping blocks 5. The hollow fiber membranes 2 have been regularly arranged through the gel of the soft glue layer 3. The outlet of the hollow fiber membranes 2 faces downward and is located outside the soft glue layer 3. As shown in the attachment, the clamping blocks 5 are located outside the water collecting pipe 1. Bend the hollow fiber membranes 2 into a U shape with both ends facing downward, and simultaneously perform the following steps; Figure 3 As shown, the clamping blocks 5 are located outside the water collecting pipe 1. Bend the hollow fiber membranes 2 into a U shape with both ends facing downward, and simultaneously perform the following steps;

[0050] 2) Membrane positioning: Use the automatic perfusion device 6 to inject the support liquid 7 into the bottom of the water collecting pipe 1 and let it stand and level. After leveling, the height of the suspended support liquid 7 is 25 mm. Then slowly insert the end heads of the clamped hollow fiber membranes 2 into the water collecting pipe 1, and let it stand until the support liquid 7 in the water collecting pipe 1 is higher than the outlet of the hollow fiber membranes 2 and levels, so as to realize that the support liquid 7 submerges and plugs the holes. The hollow fiber membranes 2 extend into the support liquid by 15 mm, and the distance between the outlet and the bottom of the water collecting pipe 1 is 10 mm;

[0051] 3) Membrane glue injection: Use another automatic perfusion device 6 to inject the encapsulation liquid at an appropriate encapsulation speed, then let it stand and level and cure to form the encapsulation layer 4;

[0052] The multi-point injector 15 moves to above the water collecting pipe 1 along with the glue injection actuator 16. The number of points of the multi-point injector 15 in the automatic perfusion device 6 is 5. The first metering device 12 and the second metering device 13 inject epoxy resin at two-stage potting speeds. The potting speed in the first stage is relatively fast to ensure that the sinking height of the support liquid during the potting process is less than 15 mm, and the potting speed in the second stage is slower to ensure that the epoxy resin will not overflow from the water collecting pipe 1. Then it is left to level and cure in a constant temperature and humidity chamber to form a potting layer 4. The height of the potting layer 4 is 45 mm. The hollow fiber membrane soft glue layer 3 is embedded 15 mm into the potting layer 4. The top of the support liquid 7 is 30 mm lower than the lower part of the soft glue layer 3. The top of the potting layer 4 is lower than the bottom of the clamping block 5. After completing the whole step, the clamping block 5 can be loosened and recycled;

[0053] 4) Membrane through-hole: After the potting layer 4 is cured, the support liquid 7 in the water collecting pipe 1 is drained out so that the water outlet of the hollow fiber membrane 2 exposes the through-hole.

[0054] The room temperature viscosity of the support liquid 7 described in step 2) is greater than 5000 mPa·s, and polyvinylpyrrolidone is selected.

[0055] As shown in the Figure 4 accompanying figure, an automatic potting device 6 for a method of preparing a curtain-type membrane module with regular arrangement includes a first cartridge group 9, a second cartridge group 10, and two perfusion actuators 11. Each perfusion actuator 11 includes a first metering device 12, a second metering device 13, a mixing glue gun 14, a multi-point injector 15, and a perfusion displacement device 16. The outlets of the first metering device 12 and the second metering device 13 are both connected to the inlet of the mixing glue gun 14. The outlet of the mixing glue gun 14 is connected to the multi-point injector 15. The perfusion displacement device 16 is connected to the multi-point injector 15. The inlets of the first metering device 12 and the second metering device 13 are respectively connected to the outlets of the first cartridge group 9 and the second cartridge group 10.

[0056] The first cartridge group 9 and the second cartridge group 10 each have two cartridges 17. The cartridges 17 of the first cartridge group 9 are all connected to the first metering device 12, and the cartridges 17 of the second cartridge group 10 are all connected to the second metering device 13.

[0057] The number of points of the multi-point injector 15 can be divided into 5. Each point has a separate adjustable flow channel, and different amounts of liquid material are distributed by adjusting the size of the flow channel. The first metering device 12 and the second metering device 13 can discharge liquid at multiple non-uniform speeds.

[0058] When perfusing the support liquid 7, the first cartridge group 9 and the second cartridge group 10 respectively inject support liquids 7 with different viscosities, and part of the support liquid 7 is the support liquid 7 used in step 4) for recycling; when perfusing the potting liquid, the first cartridge group 9 and the second cartridge group 10 respectively inject two components of epoxy resin.

[0059] Example 2

[0060] A regularly arranged curtain - type membrane module, a preparation method thereof, and an automatic perfusion device used to implement the preparation method. Other parts are as shown in Example 1, the differences are as follows:

[0061] For a regularly arranged curtain - type membrane module, the hollow fiber membrane sheet 2 is made of polyvinylidene fluoride (PVDF) hollow fiber filaments prepared by the coating method. Each hollow fiber membrane sheet 2 is composed of 43 hollow fiber filaments with a diameter of 2 mm and a length of 2 m, which are regularly arranged. The distance between adjacent two filaments is 1 mm. The stacking layer number of the hollow fiber membrane sheets 2 is 20 layers. The height of the soft glue layer 3 is 15 mm and the thickness is 3.5 mm. The material of the soft glue layer 3 is styrene - block elastomer.

[0062] As shown in the attached Figure 5 figure, the potting layer 4 is divided into an upper potting layer 42 and a lower potting layer 41. Among them, the upper potting layer 42 is far from the water outlet end of the hollow fiber membrane sheet 2, and the hardness of the upper potting layer 42 is about 30 - 40 Shore A. The lower potting layer 41 uses two - component polyurethane, and the upper potting layer 42 uses two - component silicone. The upper potting layer 42 and the lower potting layer 41 pot the hollow fiber membrane sheet 2 together with all the soft glue layers 3 in the water collecting pipe 1.

[0063] It also includes a clamping block 5. The clamping block 5 is clamped outside the soft glue layer 3 and is potted in the water collecting pipe 1 by the upper potting layer 42 and the lower potting layer 41.

[0064] The height of the lower potting layer 41 is 30 mm, the depth of the soft glue layer 3 embedded in the lower potting layer 41 is 5 mm, the height of the upper potting layer 42 is 15 mm, the depth of the soft glue layer 3 embedded in the upper potting layer 42 is 5 mm, and the height of the clamping block 5 is 5 mm.

[0065] The length of the hollow fiber membrane sheet 2 outside the potting layer 4 of the lower potting layer 41 is 10 mm, and the distance from the water outlet of the hollow fiber membrane sheet 2 to the bottom of the water collecting pipe 1 is 5 mm.

[0066] A preparation method of a regularly arranged curtain - type membrane module, the differences from Example 1 are as follows:

[0067] In step 2), the support liquid 7 uses sodium polyacrylate.

[0068] Step 3) Membrane sheet potting: Use an automatic perfusion device 6 to inject the lower - layer potting liquid polyurethane at an appropriate potting speed. The first barrel group 9 and the second barrel group 10 of the automatic perfusion device 6 respectively inject two components (main agent and curing agent) of the polyurethane, then let it stand for leveling and curing to form the lower potting layer 41. After that, use an automatic perfusion device 6 to inject silicone, let it stand for leveling and curing to form the upper potting layer 42. The first barrel group 9 and the second barrel group 10 of the automatic perfusion device 6 respectively inject two components (main agent and curing agent) of the silicone;

[0069] The multi-point injector 15 moves along with the glue injection actuator 16 to above the water collecting pipe 1. The number of injection points of the multi-point injector 12 in the automatic glue injection device 8 is 5. The first metering device 12 and the second metering device 13 inject polyurethane at a fixed speed to ensure that the sinking height of the support liquid during the potting process is less than 10 mm. Then, it is left to level and cure in a constant temperature and humidity chamber to form the lower potting layer 41. The height of the lower potting layer 41 is 30 mm, and the hollow fiber membrane soft glue layer 3 is embedded 5 mm into the lower potting layer 41. Then, silicone is injected at a fixed speed. The slow injection speed ensures that the silicone does not overflow from the water collecting pipe 1. Then, it is left to level and cure in a constant temperature and humidity chamber to form the upper potting layer 42. The height of the upper potting layer 42 is 15 mm, and the soft glue layer 3 is embedded 5 mm into the upper potting layer 42. The top of the support liquid 7 is 25 mm lower than the lower part of the soft glue layer 3. The clamping block 5 is potted into the water collecting pipe 1 to ensure the relative position between the diaphragm and the water collecting pipe 1.

[0070] Example 3

[0071] A regularly arranged curtain-type membrane module, its preparation method, and the support liquid injection device and other parts of the automatic glue injection device used to implement this preparation method are as shown in Example 1. The difference is that:

[0072] For a regularly arranged curtain-type membrane module, the hollow fiber membrane sheet 2 is made of polytetrafluoroethylene (PTFE) hollow fiber membrane filaments prepared by the winding method. Each hollow fiber membrane sheet 2 is composed of 100 hollow fiber membrane filaments with a diameter of 2 mm and a length of 2.5 m, regularly arranged. The distance between adjacent two membrane filaments is 0.5 mm. The stacking layer number of the hollow fiber membrane sheets 2 is 9 layers. The height of the soft glue layer 3 is 40 mm, and the thickness is 2.7 mm. The material of the soft glue layer 3 is polyethylene. As shown in the appendix Figure 6 As shown, the potting layer 4 pots the hollow fiber membrane sheet 2 together with the entire soft glue layer 3 into the water collecting pipe 1. It also includes a clamping block 5. The clamping block 5 is clamped outside the soft glue layer 3 and is potted into the water collecting pipe 1 by the potting layer 4.

[0073] The height of the potting layer 4 is 35 mm, the depth of the soft glue layer 3 embedded into the potting layer 4 is 15 mm, the length of the hollow fiber membrane sheet 2 outside the potting layer 4 is 10 mm, and the distance between the water outlet of the hollow fiber membrane sheet 2 and the bottom of the water collecting pipe 1 is 5 mm.

[0074] The material of the potting layer 4 is a two-component epoxy resin, including two components: epoxy resin main agent and epoxy resin curing agent.

[0075] A preparation method of a regularly arranged curtain-type membrane module, different from Example 1 in that:

[0076] In step 2), the support liquid 7 is selected as hydroxypropyl methylcellulose and waterborne polyurethane.

[0077] Step 3) Diaphragm potting: Use the automatic perfusion device 6 to inject the potting liquid at an appropriate potting speed, and then let it stand for leveling and curing to form the potting layer 4;

[0078] The first barrel group 9 injects the main agent of epoxy resin, and the second barrel group 10 injects the curing agent of epoxy resin.

[0079] The multi-point injector 12 moves to above the water collecting pipe 1 along with the glue injection actuator 14. The number of points of the multi-point injector 12 in the automatic perfusion device 6 is 5. The first metering device 12 and the second metering device 13 inject the main agent of epoxy resin and the curing agent of epoxy resin at two-stage potting speeds respectively. The potting speed in the first stage is faster to ensure that the sinking height of the support liquid during the potting process is less than 10 mm, and the potting speed in the second stage is slower to ensure that the epoxy resin will not overflow from the water collecting pipe 1. Then let it stand for leveling and curing in a constant temperature and humidity chamber to form the potting layer 4. The height of the potting layer 4 is 35 mm. The hollow fiber membrane soft glue layer 3 is embedded 15 mm into the potting layer 4. The top of the support liquid 7 is 10 mm lower than the lower part of the soft glue layer 3. The clamping block 5 is potted into the water collecting pipe 1 to ensure the relative position between the diaphragm and the water collecting pipe 1.

[0080] Based on the characteristic that the PTFE (polytetrafluoroethylene) hollow fiber membrane filaments are not easily brittle, the upper layer of the potting layer 4 does not need to have a very low hardness and can have the same hardness as the lower layer. The entire soft glue layer 3 together with the clamping block 5 is potted inside to maintain stability.

[0081] The above is only the preferred embodiment of the present invention and is not used to limit the scope of implementation of the present invention. All equivalent changes and modifications made according to the content of the patent scope of this application should fall within the technical scope of the present invention.

Claims

1. A preparation method of a regularly arranged curtain-type membrane module. The regularly arranged curtain-type membrane module includes a water collecting pipe (1) and a plurality of hollow fiber membrane sheets (2). The hollow fiber membrane sheets (2) are regularly arranged through a soft glue layer (3), and further includes a potting layer (4). The potting layer (4) potting a plurality of hollow fiber membrane sheets (2) together with all or part of the soft glue layer (3) in the water collecting pipe (1). The water outlet ends of the hollow fiber membrane sheets (2) are located outside the soft glue layer (3) and the potting layer (4), and is characterized in that: It includes the following steps: 1) Diaphragm clamping: Stack the two ends of several hollow fiber membranes (2) neatly into blocks and clamp them with clamping blocks (5). The hollow fiber membranes (2) have been regularly arranged by gelation through a soft glue layer (3). The water outlet of the hollow fiber membranes (2) faces downward and is located outside the soft glue layer (3). 2) Diaphragm positioning: Use an automatic perfusion device (6) to inject the support liquid (7) into the bottom of the water collection pipe (1) and let it stand and level. Then slowly insert the end of the clamped hollow fiber membrane (2) into the water collection pipe (1). Let it stand until the support liquid (7) in the water collection pipe (1) is higher than the water outlet of the hollow fiber membrane (2) and levels, so as to achieve the support liquid (7) submerging and plugging the holes. The room temperature viscosity of the support liquid (7) is greater than 5000 mPa·s. 3) Diaphragm glue filling: Use another automatic perfusion device (6) to inject the potting liquid at an appropriate potting speed, and then let it stand and level and cure to form a potting layer (4). 4) Diaphragm through-hole: After the potting layer (4) cures, let the support liquid (7) in the water collection pipe (1) flow out so that the water outlet of the hollow fiber membrane (2) exposes a through-hole. The automatic perfusion device (6) includes a first barrel group (9), a second barrel group (10), and several perfusion execution mechanisms (11). Each perfusion execution mechanism (11) includes a first metering device (12), a second metering device (13), a mixing glue gun (14), a multi-point syringe (15), and a perfusion displacement device (16). The outlets of the first metering device (12) and the second metering device (13) are both connected to the inlet of the mixing glue gun (14). The outlet of the mixing glue gun (14) is connected to the multi-point syringe (15). The perfusion displacement device (16) is connected to the multi-point syringe (15). The inlets of the first metering device (12) and the second metering device (13) are respectively connected to the outlets of the first barrel group (9) and the second barrel group (10).

2. The preparation method of an orderly arranged curtain-type membrane module according to claim 1, characterized in that: The potting layer (4) is divided into an upper potting layer (42) and a lower potting layer (41). Among them, the upper potting layer (42) is far from the water outlet end of the hollow fiber membrane (2), and the hardness of the upper potting layer (42) is less than 60 Shore A.

3. The preparation method of a regularly arranged curtain-type membrane module according to claim 1, characterized in that: The height of the potting layer (4) is 10 - 80 mm. The depth of the soft glue layer (3) embedded in the potting layer (4) is 3 - 20 mm. The length of the hollow fiber membrane (2) located outside the potting layer 4 is 3 - 20 mm. The distance between the water outlet of the hollow fiber membrane (2) and the bottom of the water collection pipe (1) is 2 - 15 mm.

4. The preparation method of a regularly arranged curtain-type membrane module according to claim 1, characterized in that: The material of the potting layer (4) is one or two of urea formaldehyde resin, polyvinyl acetate resin, polyacrylic acid resin, polyurethane, epoxy resin, or silicone.

5. The preparation method of an orderly arranged curtain-type membrane module according to claim 1, characterized in that: The hollow fiber membrane (2) is formed by regularly arranging 10 - 2000 hollow fiber membranes with a length of 0.1 - 3 m. The distance between adjacent two membrane filaments is 0.1 - 10 mm. The stacking layer number of the hollow fiber membrane (2) is 1 - 60 layers. The height of the soft glue layer (3) is 1 - 50 mm, and the thickness is 0.2 - 5 mm. The material of the soft glue layer (3) is one of ethylene-vinyl acetate copolymer, styrene block elastomer, polyolefin, polyamide, and polyester.

6. The preparation method of a regularly arranged curtain-type membrane module according to claim 1, characterized in that: It further includes a clamping block (5), which is clamped outside the soft rubber layer (3). The clamping block (5) is potted in the water collecting pipe (1) by the potting layer (4) or is independent of the potting layer (4).

7. The preparation method of an orderly arranged curtain membrane module according to claim 1, characterized in that: In step 2), the top of the support liquid (7) is 0 - 50 mm lower than the lower part of the soft rubber layer (3).

8. The preparation method of a regularly arranged curtain-type membrane module according to claim 1, characterized in that: The material of the support liquid (7) in step 2) is a solution of one or two of polyvinylpyrrolidone, sodium polyacrylate, polymethyl acrylate, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, waterborne polyurethane, polysaccharide, polyethylene oxide, etc.

9. The preparation method of a regularly arranged curtain membrane module according to claim 1, characterized in that: The potting process in step 3) can be two - layer potting for the upper and lower layers, and the hardness of the material liquid for the upper - layer potting is less than that of the lower - layer material liquid.

10. The preparation method of an orderly arranged curtain membrane module according to claim 1, characterized in that: The first cartridge group (9) and the second cartridge group (10) each have 1 - 2 cartridges (17). The cartridges (17) of the first cartridge group (9) are all connected to the first metering device (12), and the cartridges (17) of the second cartridge group (10) are all connected to the second metering device (13).

11. The preparation method of a regularly arranged curtain-type membrane module according to claim 1, characterized in that: The number of the perfusion execution mechanisms (11) is 1 - 10.

12. The preparation method of a regularly arranged curtain-type membrane module according to claim 1, characterized in that: The number of injection points of the multi - point injector (15) can be divided into 2 - 10. Each injection point has a separate adjustable flow channel, and different material liquid volume distributions are achieved by adjusting the size of the flow channel. The first metering device (12) and the second metering device (13) can discharge liquid in multiple non - uniform speeds.

13. The preparation method of an orderly arranged curtain-type membrane module according to claim 1, characterized in that: When perfusing the support liquid, the first cartridge group (9) and the second cartridge group (10) can respectively inject support liquids with different viscosities. When perfusing the potting liquid, the first cartridge group (9) and the second cartridge group (10) can respectively inject different components of the potting liquid.

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