Separation membrane module and filtration device

Abstract

The present application provides a separation membrane assembly and a filtration device wherein the separation membrane assembly comprises: a housing having a predetermined length; the multiple diaphragms are arranged in the shell in the length direction of the shell, at least one end of each diaphragm in the multiple diaphragms is connected with the inner wall of the shell, a feeding flow channel is formed between every two adjacent diaphragms, and when to-be-filtered liquid flows along the feeding flow channels, the to-be-filtered liquid flows along the feeding flow channels. The plurality of membranes can be used for filtering liquid to be filtered so as to obtain permeate liquid in the plurality of membranes, at least one drainage hole is correspondingly formed in the joint of the shell and each membrane, and the drainage hole is used for leading the permeate liquid obtained in the corresponding membrane out of the separation membrane assembly.

Description

Technical Field

[0001] The present application relates to the field of membrane separation technology, and in particular to a separation membrane component and a filtering device. Background Art

[0002] Ultrafiltration membrane separation technology uses materials with good chemical stability and mechanical strength (e.g., polysulfone, polyethersulfone, polypropylene, polyvinylidene fluoride, ceramics or metals, etc.) to make microporous membranes, which can effectively separate macromolecules, colloids, particles and microorganisms in solutions. Its structural forms are diverse, including hollow fibers, tubular, flat and rolled, and are widely used in water treatment, food and beverage, medicine, electronics, chemical industry and environmental protection. Among them, the structural characteristics of tubular membranes (e.g., symmetry at both ends and wide flow channels) combined with cross-flow operation and other methods can effectively reduce the risk of blockage and deal with problems such as high solid content and pollutant deposition in high-concentration wastewater. However, when the tubular membrane system is running, it is usually necessary to maintain a higher flow rate (e.g., 4m / s-6m / s) to reduce pollutant deposition, which greatly increases energy consumption and operating costs. In addition, the cleaning and replacement of tubular membrane components are relatively complicated and the investment cost is high. Therefore, how to break through the limitations of current technology to achieve more energy-saving and more efficient filtration effects has become an important issue that needs to be solved urgently. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the present application provides a separation membrane assembly, comprising: a shell having a predetermined length; and a plurality of membrane sheets, wherein the plurality of membrane sheets are arranged inside the shell along the length direction of the shell, at least one end of each of the plurality of membrane sheets is connected to the inner wall of the shell, and a feed channel is provided between two adjacent membrane sheets, and during the period when the liquid to be filtered flows along the feed channel, the plurality of membrane sheets can filter the liquid to be filtered so as to obtain permeate inside the plurality of membrane sheets, wherein at least one drainage hole is correspondingly provided at the connection between the shell and each membrane sheet, and the drainage hole is used to draw the permeate obtained inside the corresponding membrane sheet out of the separation membrane assembly.

[0004] Furthermore, at least one end of each of the plurality of diaphragms is bonded and sealed to the inner wall of the shell by means of a sealant.

[0005] Furthermore, each of the plurality of diaphragms is in the shape of a flat plate, and the plurality of diaphragms are distributed in parallel or at a predetermined angle.

[0006] Further, in the case where the plurality of membranes are distributed in parallel, the distances between two adjacent membranes are equal.

[0007] Furthermore, the separation membrane assembly has an inlet and an outlet, and a guide ring is arranged at the inlet.

[0008] Furthermore, the guide ring and the shell are distributed in an integrated manner or in a separate manner.

[0009] Furthermore, a guide plate is provided on a side of each of the plurality of membranes corresponding to the inflow direction of the liquid to be filtered.

[0010] Furthermore, the guide plate is made of metal material or engineering plastic material; or the guide plate is obtained by locally thickening or locally strengthening one side of each membrane corresponding to the inflow direction of the liquid to be filtered.

[0011] Furthermore, the shell is cylindrical in shape.

[0012] The present application also discloses a filtration device, comprising: a plurality of the separation membrane assemblies as described above; a permeate liquid pipeline; and a gathering component, wherein the plurality of separation membrane assemblies are connected in series end to end, the shell of each of the plurality of separation membrane assemblies is connected to the permeate liquid pipeline via the gathering component, and the permeate liquid obtained inside the plurality of membrane sheets of each of the plurality of separation membrane assemblies can be drained to the outside of the shell through the drainage holes, and gathered by the gathering component to flow into the permeate liquid pipeline.

[0013] Furthermore, the filtration device also includes: a flow meter and a regulating valve, the flow meter and the regulating valve are arranged at one end of the permeate pipeline, the flow meter is used to detect the flow rate of the permeate corresponding to each separation membrane assembly in the multiple separation membrane assemblies, and the regulating valve is used to cooperate with the flow meter to adjust the flow rate of the permeate corresponding to each separation membrane assembly in the multiple separation membrane assemblies.

[0014] The embodiments described in this application have the following beneficial effects:

[0015] The filtration device provided by the present application includes a plurality of separation membrane assemblies, a permeate pipeline and a confluence member. The plurality of separation membrane assemblies are connected in series end to end. Each separation membrane assembly includes a plurality of membrane sheets and a shell. The shell of each separation membrane assembly is connected to the permeate pipeline through a confluence member, and the plurality of membrane sheets in each separation membrane assembly are arranged inside the shell along the length direction of the shell, and at least one end of each membrane sheet is connected to the inner wall of the shell. At the same time, there is a feed flow channel between two adjacent membrane sheets. During the flow of the liquid to be filtered along the feed flow channel, the plurality of membrane sheets in the separation membrane assembly can filter the liquid to be filtered to obtain permeate. In addition, at least one drainage hole is correspondingly arranged at the connection between the shell and each membrane sheet, which is used to drain the permeate obtained inside the plurality of membrane sheets to the outside of the shell, and to be collected through the confluence member to flow into the permeate pipeline.

[0016] By arranging the multiple membranes of each separation membrane assembly in the filter device inside the shell along the length direction of the shell, the inner membrane area per unit volume of the separation membrane assembly is increased, and the installation space of the separation membrane assembly is saved. At the same time, by optimizing the flow channel structure of the separation membrane assembly, a lower flow rate can achieve effective shear force on the membrane surface, reducing the deposition of pollutants on the membrane surface. In addition, the feature of supporting backwashing makes the physical cleaning effect of the separation membrane assembly better, reduces the dependence on chemical cleaning, thereby extending the cleaning cycle, improving the filtration efficiency of the filtration device, and reducing the investment cost and operating cost of the filtration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present application, the following briefly introduces the drawings required for the description of the embodiments. The drawings described below are only exemplary embodiments of the present application.

[0018] Figure 1 A schematic diagram of a separation membrane assembly according to an embodiment of the present application is shown;

[0019] Figure 2 A schematic diagram of a radial cross section of a separation membrane assembly according to an embodiment of the present application is shown;

[0020] Figure 3 A schematic diagram of a diaphragm according to an embodiment of the present application is shown;

[0021] Figure 4 A schematic diagram of a guide plate according to an embodiment of the present application is shown;

[0022] Figure 5 A partial enlarged schematic diagram of a guide plate according to an embodiment of the present application is shown;

[0023] Figure 6 A working flow chart of a filtering device according to an embodiment of the present application is shown.

[0024] In the accompanying drawings: 100-separation membrane assembly, 101-shell, 102-diaphragm, 103-feed channel, 104-drainage hole, 105-guide plate, 106-guide ring, 1021-support layer, 1022-separation layer, 1023-embedded layer, 201-permeate pipeline, 202-collecting component, 203-flow meter, 204-regulating valve, 205-feed tank, 206-feed pump, 207-circulation pump, 208-backwash liquid tank, 209-backwash pump. DETAILED DESCRIPTION

[0025] The technical solutions in this application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of this application. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0026] The core function of the filtration device is to remove impurities such as macromolecules, colloids, particles or microorganisms in the fluid through physical screening methods, thereby improving the purity of the fluid, protecting equipment, improving product quality, promoting resource recovery, optimizing process flow, and achieving environmental friendliness. As an important component of the filtration device, ultrafiltration membrane (also known as "separation membrane" or "separation membrane assembly") has a wide and in-depth application field. For example, in the field of water treatment, ultrafiltration membranes are widely used in key links such as tap water purification, sewage treatment and reclaimed water reuse due to their efficient interception capacity and significant improvement in water quality. Through the fine filtration of ultrafiltration membranes, suspended matter, colloids, bacteria and some viruses in water can be effectively removed, significantly improving water quality and meeting various water needs. In the food and beverage industry, the introduction of ultrafiltration membranes provides a safer and more efficient option for product clarification and filtration. In the production process of products such as juices, beverages and alcoholic beverages, ultrafiltration membranes can effectively retain the nutrients and flavors of the products, while removing impurities and microorganisms to ensure the purity and safety of the products. In the pharmaceutical industry, ultrafiltration membranes can accurately control separation conditions during the purification, separation and concentration of drugs, achieve high-purity and high-efficiency separation and purification, and effectively ensure the quality and safety of drugs. In the electronics industry, ultrafiltration membranes are used to prepare ultrapure water, providing key guarantees for precision manufacturing of semiconductors, integrated circuits, etc. In the chemical industry, the application of special membrane materials such as strong acid, strong alkali and solvent-resistant membranes meets the stringent requirements of complex industrial processes on the performance of membrane materials. Therefore, for filtration devices, the chemical stability, pollution resistance, cleaning frequency and maintenance cost of ultrafiltration membranes comprehensively determine the performance and service life of ultrafiltration membranes in filtration devices.

[0027] Figure 1 A schematic diagram of a separation membrane assembly according to an embodiment of the present application is shown. Figure 2 shows a radial cross-sectional schematic diagram of a separation membrane assembly according to an embodiment of the present application, Figure 3 FIG. 1 shows a schematic diagram of a diaphragm according to an embodiment of the present application. Figure 4 A schematic diagram of a guide plate according to an embodiment of the present application is shown. Figure 5 A partial enlarged schematic diagram of a guide plate according to an embodiment of the present application is shown. Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 The separation membrane module 100 of the present application will be described in detail.

[0028] The present application provides a separation membrane assembly 100, comprising: a shell 101, wherein the shell 101 has a predetermined length; and a plurality of membrane sheets 102, wherein the plurality of membrane sheets 102 are arranged inside the shell 101 along the length direction of the shell 101, wherein at least one end of each of the plurality of membrane sheets 102 is connected to the inner wall of the shell 101, and a feed channel 103 is provided between two adjacent membrane sheets 102, wherein during the flow of the liquid to be filtered along the feed channel 103, the plurality of membrane sheets 102 can filter the liquid to be filtered so as to obtain permeate inside the plurality of membrane sheets 102, wherein at least one drainage hole 104 is correspondingly provided at the connection between the shell 101 and each membrane sheet 102, and the drainage hole 104 is used to lead the permeate obtained inside the corresponding membrane sheet 102 out of the separation membrane assembly 100.

[0029] The shell 101 is the supporting structure of the separation membrane assembly 100 and has a predetermined length. It supports and protects the multiple membranes 102 inside and provides space for the flow of the liquid to be filtered. The length of the shell 101 determines the overall size of the separation membrane assembly 100. The shell 101 can be cylindrical, quasi-cylindrical, square columnar, etc.

[0030] like Figure 1 and Figure 2 As shown, the shape of the housing 101 can be cylindrical. The cylindrical housing 101 has a uniform stress distribution characteristic. When subjected to internal pressure, the cylindrical structure can evenly distribute the pressure to the surface of the entire housing 101, thereby avoiding local pressure concentration, thereby enhancing the mechanical strength and pressure resistance of the housing 101. The cylindrical housing 101 can also better adapt to the arrangement of multiple diaphragms 102, so that the spacing between multiple diaphragms 102 is more uniform, thereby improving the packing density and filtration efficiency of the separation membrane assembly 100. The flow channel design inside the cylindrical housing 101 can also reduce the resistance to fluid flow. Due to the symmetry of its internal space, when the liquid to be filtered flows in the feed flow channel 103, it can be more evenly distributed to the surface of each diaphragm 102, forming a stable shear force, thereby effectively reducing the fouling on the surface of the diaphragm 102. In addition, the end face and side structure of the cylindrical housing 101 are relatively simple, which is convenient for sealing and can reduce the risk of leakage of the liquid to be filtered.

[0031] The plurality of membranes 102 are the core components of the separation membrane assembly 100, and are used to filter the liquid to be filtered. The interior of the plurality of membranes 102 is a porous structure, which allows liquids meeting certain conditions to pass through the surface of the membrane 102 (e.g., the separation layer 1022) under pressure and enter the interior of the membrane 102, while liquids and impurities that do not meet certain conditions cannot pass through the membrane 102, thereby achieving the filtering function.

[0032] A plurality of membranes 102 are arranged along the length direction of the housing 101, and at least one end of each membrane 102 is connected to the inner wall of the housing 101. This connection method not only ensures the fixation and sealing of the membrane 102, but also divides the internal space of the housing 101 (i.e., the flow space of the liquid to be filtered) into a plurality of feed channels 103. Preferably, both ends of each membrane 102 are connected to the inner wall of the housing 101. The feed channel 103 is a channel for the liquid to be filtered to flow in the separation membrane assembly 100, located between two adjacent membranes 102, and surrounded by a plurality of membranes 102 and the inner wall of the housing 101. The feed channel 103 is an open channel and has no filler or support inside. The feed channel 103 is in the shape of a narrow gap, so that the liquid can flow at a lower cross-flow velocity (e.g., 0.5m / s-2m / s), thereby forming shear scouring on the surface of the membrane 102 and reducing fouling on the surface of the membrane 102. At the same time, although the feed channel 103 is in the shape of a narrow gap, the length of the feed channel 103 is relatively long, so the cross-sectional area is relatively large. A larger channel area can reduce the pressure loss of the feed cycle. When multiple separation membrane assemblies 100 are used in series, the working pressure difference between the head separation membrane assembly and the end separation membrane assembly is small, which is conducive to the balanced distribution and control of the flux. When the liquid to be filtered flows inside the feed channel 103, it contacts the surfaces of multiple membranes 102. Some liquids that meet specific conditions pass through the surface of the membrane 102 (such as the separation layer 1022) and enter the inside of the membrane 102 to form a permeate. At least one drainage hole 104 is correspondingly arranged at the connection between the housing 101 and each membrane 102. The drainage hole 104 is connected to the inside of the membrane 102 and is used to lead the permeate inside the membrane 102 out of the separation membrane assembly 100.

[0033] It should be noted that, at the center of the upper end of each membrane sheet 102, there is a cutting area (also called "permeate outlet") protruding relatively from the edge of the membrane sheet, which is aligned with the drainage hole 104 on the shell 101 and is used to draw the permeate out of the membrane sheet 102. When the separation membrane module 100 is potted, the drainage hole 104 on the shell 101 of the separation membrane module 100 is aligned with the cutting area, so that the permeate in the middle of each membrane sheet 102 can flow from the cutting area through the drainage hole 104 to the outside of the separation membrane module 100.

[0034] For example, Figure 3As shown, the structure of each diaphragm 102 is composed of a support layer 1021, a separation layer 1022 and a mosaic layer 1023. The support layer 1021 is a dense open bubble structure (i.e., a sponge structure) with good water permeability, providing mechanical support and diversion for the separation membrane assembly 100. In addition, the large-size pores of the support layer 1021 ensure that the flow resistance of the permeate in the diaphragm 102 is low. At the same time, the wear-resistant components in the support layer 1021 also ensure the strength of the separation layer 1022, and achieve good durability of the separation membrane assembly 100. The separation layer 1022 is uniformly embedded in the support layer 1021. The separation layer 1022 is formed by crystallization of the casting liquid material to form a porous film structure, and the filtration accuracy is usually 0.02μm-0.04μm, realizing the main filtration function of the separation membrane assembly 100. The mosaic layer 1023 is a transition layer formed by the separation layer 1022 and the support layer 1021 tightly embedded to ensure the integrity of each diaphragm 102. The multiple membranes 102 can withstand backwashing at a pressure of 15psi-20psi from the inside without deformation and without the separation layer 1022 falling off, so as to peel off the dirt accumulated on the surface of the membrane 102, thereby restoring the flux of the separation membrane assembly 100 and effectively extending the cleaning cycle of the separation membrane assembly 100.

[0035] At least one end of each of the plurality of diaphragms 102 is bonded and sealed to the inner wall of the housing 101 by means of a sealant.

[0036] For example, Figure 1 and Figure 2As shown, at least one end of each diaphragm 102 is bonded and sealed to the inner wall of the housing 101 by a sealant, ensuring the stability and sealing of the connection between each diaphragm 102 and the inner wall of the housing 101. Preferably, both ends of each diaphragm 102 are bonded and sealed to the inner wall of the housing 101 by a sealant, further improving the stability and sealing of the connection between each diaphragm 102 and the inner wall of the housing 101. During the filtration process, the liquid to be filtered flows in the feed channel 103, which will generate a certain pressure and shear force on the multiple diaphragms 102. By bonding and sealing at least one end of the diaphragm 102 to the inner wall of the housing 101, the multiple diaphragms 102 can be firmly fixed inside the housing 101 to avoid displacement or deformation due to liquid flow. At the same time, the use of sealant is to prevent liquid leakage and cross contamination. During the filtration process, the liquid to be filtered needs to flow in the feed channel 103, while the permeate enters the interior of the membrane 102 through the surface of the membrane 102 (e.g., the separation layer 1022), and is discharged from the separation membrane assembly 100 through the drainage hole 104. If the connection between the multiple membranes 102 and the housing 101 is not sealed, the liquid to be filtered may be mixed with the permeate, reducing the filtration effect of the separation membrane assembly 100; or the liquid may leak, affecting the normal operation of the filtration device; or contaminants may enter the permeate, reducing the filtration purity of the filtration device.

[0037] It should be noted that if only one end of the diaphragm 102 is bonded and sealed to the inner wall of the housing 101 by a sealant, the other end of the diaphragm 102 can be fixed to the inner wall of the housing 101 by other means (for example, mechanical fixation or a mosaic structure) to meet specific fluid mechanics design requirements. It is understandable that in this case, the position of the inner wall of the housing 101 corresponding to the other end of the diaphragm 102 does not need to be provided with a drainage hole 104. If both ends of the diaphragm 102 are bonded and sealed to the inner wall of the housing 101 by a sealant, the stability of the multiple diaphragms 102 in the separation membrane assembly 100 can be further enhanced to prevent liquid from leaking from the ends of the diaphragms 102.

[0038] It should be noted that, since the separation membrane assembly 100 may be used to process liquids of various chemical properties, the sealant needs to be able to withstand the erosion of chemical substances such as acids, alkalis and organic solvents, and also needs to have sufficient bonding strength and durability to withstand the pressure and shear force generated by the flow of liquid. At the same time, the sealant needs to have good compatibility with the diaphragm material and the shell material to avoid sealing failure due to chemical reaction or physical mismatch.

[0039] Each of the plurality of diaphragms 102 is in a flat plate shape, and the plurality of diaphragms 102 are distributed in parallel or at a predetermined angle.

[0040] For example, Figure 1 , Figure 2 as well as Figure 3 As shown, each diaphragm 102 is in the shape of a long strip grid (i.e., a flat plate), and the geometric shape of the flat diaphragm 102 is simple, which is easy to manufacture and process. Compared with hollow fiber membranes or tubular membranes, the production process of the flat diaphragm 102 is more controllable, and its uniformity and consistency can be better guaranteed. At the same time, the flat diaphragms 102 can be closely arranged inside the shell 101, thereby achieving a higher membrane area filling density. In addition, the surface of the flat diaphragm 102 is flat, and it can fully contact with the liquid to be filtered inside the feed flow channel 103, forming a uniform shear force, which helps to reduce the fouling of the surface of the diaphragm 102 in the separation membrane assembly 100 and extend the cleaning cycle of the separation membrane assembly 100.

[0041] Specifically, the plurality of membranes 102 can be arranged in parallel, that is, each membrane 102 is arranged in parallel along the length direction of the housing 101, and the axial space inside the housing 101 is used to the maximum extent to form a feed channel 103, so that when the liquid to be filtered flows in the feed channel 103, it can evenly impact the surface of each membrane 102 through a relatively low cross-flow velocity (for example, 0.5m / s-2m / s), forming a stable shear force, reducing fouling and improving the filtration efficiency. The plurality of membranes 102 can also be arranged at a predetermined angle inside the housing 101 to form a non-parallel distribution mode (for example, a Z-shaped, N-shaped, M-shaped, W-shaped, *-shaped, spiral, and a combination of multiple shapes, etc.). By adjusting the angles between the plurality of membranes 102, the operating area of ​​the membrane 102 can be further increased, and the shear force of the liquid to be filtered on the surface of the membrane 102 can be enhanced, thereby more effectively reducing fouling, and is particularly suitable for filtering high-concentration, highly polluting liquids. At the same time, the multiple membranes 102 arranged obliquely can change the flow direction and flow speed of the liquid to be filtered, further optimize the fluid mechanics performance, and reduce the formation of dead zones and eddies.

[0042] When the plurality of membrane sheets 102 are distributed in parallel, the distances between two adjacent membrane sheets are equal.

[0043] For example, Figure 1 and Figure 2As shown, when multiple diaphragms 102 are distributed in parallel, they are arranged in parallel along the length direction of the housing 101, that is, multiple diaphragms 102 maintain the same orientation in the space of the housing 101, and the surfaces of each diaphragm 102 are parallel to each other, and the distance between two adjacent diaphragms 102 is equal, so that the width of the feed channel 103 is consistent. This uniform flow channel design can ensure that the liquid to be filtered flows at a uniform speed in the feed channel 103, avoiding the flow rate difference caused by inconsistent flow channel width. At the same time, the uniform flow channel design can ensure that the contact time between the liquid to be filtered and the surface of each diaphragm 102 is consistent, thereby achieving efficient filtration. Since the filtering conditions of each diaphragm 102 are the same, the filtering performance of the entire separation membrane assembly 100 is more stable, and the filtering capacity of the filtering device can be better exerted. In addition, since the width of the feed channel 103 is consistent, the flow resistance of the liquid in the channel is relatively small and evenly distributed, which effectively reduces the cross-flow velocity required by the system, thereby reducing energy consumption and reducing the operating cost of the filtering device.

[0044] A guide plate 105 is disposed on a side of each of the plurality of membranes 102 corresponding to the inflow direction of the liquid to be filtered.

[0045] For example, Figure 4 and Figure 5 As shown, each of the multiple membranes 102 is provided with a guide plate 105 on the side corresponding to the inflow direction of the liquid to be filtered. The guide plate 105 is installed on the end face of each membrane 102, located on the side of the inflow direction of the liquid to be filtered, that is, when the liquid to be filtered enters the separation membrane assembly 100 and flows along the feed flow channel 103, the first thing it contacts is the guide plate 105. The main function of the guide plate 105 is to guide the flow direction of the liquid so that the liquid to be filtered is evenly distributed on the surface of the multiple membranes 102. In this way, the liquid to be filtered can be prevented from directly impacting the membrane 102, and the mechanical damage to the multiple membranes 102 caused by excessive local flow velocity can be reduced. The guide plate 105 can also help the liquid form a more uniform shear force on the surface of the multiple membranes 102, which helps to reduce the fouling of the surface of the multiple membranes 102, thereby improving the filtration efficiency of the filtration device and extending the cleaning cycle of each membrane 102.

[0046] The guide plate 105 is made of metal or engineering plastic; or the guide plate 105 is obtained by partially thickening or strengthening one side of each membrane 102 corresponding to the inflow direction of the liquid to be filtered.

[0047] For example, the guide plate 105 can be made of metal material (for example, stainless steel, titanium alloy, Hastelloy, etc.) or engineering plastic material (for example, polypropylene, polycarbonate, etc.). The metal material has high mechanical strength and wear resistance, so that it can withstand the impact force and shear force generated by the flow of the liquid to be filtered in the liquid with high flow rate or high solid content. At the same time, the metal material also has good corrosion resistance and thermal conductivity, can adapt to liquids of various chemical properties, and evenly distribute heat during the filtration process to reduce performance degradation caused by local overheating. The engineering plastic material is relatively light in weight, has good chemical corrosion resistance, and can adapt to a variety of chemical environments. At the same time, the engineering plastic material can be secondary processed by injection molding, extrusion and other processes, so that it can be customized in complex shapes and structures according to the design requirements of the separation membrane assembly 100.

[0048] For example, the guide plate 105 can also be obtained by locally thickening the side of the diaphragm 102 corresponding to the inflow direction of the liquid to be filtered. The locally thickened guide plate 105 forms an integrated structure with the diaphragm 102, reducing the assembly steps and connection parts, and improving the overall sealing and reliability. By locally thickening, the use of additional materials can also be reduced, thereby reducing production costs. In addition, the guide plate 105 can also be obtained by locally reinforcing the side of the diaphragm 102 corresponding to the inflow direction of the liquid to be filtered. Special materials or processes (for example, embedding reinforcing ribs or using composite materials, etc.) are used at the inflow end of each diaphragm 102 to locally strengthen it, improve the wear resistance and impact resistance of the end of each diaphragm 102, and extend its service life.

[0049] The separation membrane assembly 100 can be installed in a horizontal direction (eg Figure 1 and Figure 2 The separation membrane assembly 100 can also be installed in a vertical direction, so that the multiple membrane sheets 102 and the feed channel 103 are parallel to the horizontal plane along the length direction of the shell 101; the separation membrane assembly 100 can also be installed in a vertical direction, so that the multiple membrane sheets 102 and the feed channel 103 are perpendicular to the horizontal plane along the length direction of the shell 101. The inlet of the separation membrane assembly 100 is usually the starting end of the feed channel 103, which is used to introduce the liquid to be filtered into the interior thereof, and the outlet of the separation membrane assembly 100 includes the drainage hole 104 and the Figure 1 The concentrate discharge end on the middle right side is used to discharge the permeate and the concentrate from the separation membrane module 100 respectively.

[0050] The separation membrane module 100 has an inlet and an outlet, and a guide ring 106 is disposed at the inlet.

[0051] A guide ring 106 (such as a guide ring 106 with an inclined surface) is provided at the inlet of the separation membrane module 100. Figure 1 and Figure 4As shown in FIG. 1 , a beveled guide ring 106 is provided on the end face of the shell 101 of the separation membrane assembly 100, which can evenly distribute the liquid entering the separation membrane assembly 100 to each feed flow channel 103. The guide ring 106 reduces the impact force of the liquid on the multiple membranes 102 by changing the flow direction of the liquid, prolongs their service life, and also reduces the wear and fouling of the end face of the membrane 102 caused by excessive local flow velocity.

[0052] The guide ring 106 and the housing 101 are integrally distributed or separately distributed.

[0053] For example, the guide ring 106 can be distributed as an integral part with the shell 101, that is, the guide ring 106 and the shell 101 are processed into an integral structure by using the same process and materials during the manufacturing process. For example, if the shell 101 is made of metal, the guide ring 106 can be a part of the end face of the shell 101, and is integrally formed with the shell 101 through machining or casting. The integrated distribution reduces the connection parts of the separation membrane assembly 100, avoids problems such as poor sealing performance that may be caused by connectors (for example, screws, welding points, etc.), thereby improving the overall mechanical strength and durability of the separation membrane assembly 100, and effectively preventing liquid leakage. At the same time, the integrated distribution also reduces the steps and complexity of the assembly process, reducing production costs and assembly errors.

[0054] For example, the guide ring 106 can also be distributed in a split type with the shell 101, that is, the guide ring 106 and the shell 101 are two independent components, which are assembled together by mechanical connection (for example, thread, snap, welding, etc.) or bonding. The guide ring 106 and the shell 101 in the split distribution can use different materials. For example, the shell 101 can use metal materials to improve strength, while the guide ring 106 can use engineering plastics to reduce costs or reduce weight. When the guide ring 106 needs to be replaced due to wear or damage, the split distribution can disassemble and replace the guide ring 106 without replacing the entire shell 101, which reduces maintenance costs and further improves the overall performance and applicability of the separation membrane assembly 100.

[0055] Figure 6 The following is a flowchart of the filtering device according to an embodiment of the present application. Figure 6 The filtering device of the present application is described in detail.

[0056] The present application provides a filtration device, comprising: a plurality of separation membrane assemblies 100; a permeate pipeline 201; and a confluence component 202, wherein the plurality of separation membrane assemblies 100 are connected in series end to end, the shell 101 of each separation membrane assembly 100 in the plurality of separation membrane assemblies 100 is connected to the permeate pipeline 201 via the confluence component 202, and the permeate obtained inside the plurality of membrane sheets 102 of each separation membrane assembly 100 in the plurality of separation membrane assemblies 100 can be drained to the outside of the shell 101 through the drainage holes 104, and collected by the confluence component 202 to flow into the permeate pipeline 201.

[0057] For example, Figure 6 As shown, the filtration device is an integrated filtration system, which consists of a plurality of separation membrane modules 100, a permeate pipeline 201 and a converging member 202. The plurality of separation membrane modules 100 are connected in series in an end-to-end manner, that is, the outlet of one separation membrane module is directly connected to the inlet of the next separation membrane module, so that the liquid to be filtered flows through each separation membrane module in turn, and the filtration effect of the filtration device is gradually improved. Specifically, the liquid to be filtered first enters the first separation membrane module 100, and under the action of the plurality of membrane sheets 102, part of the liquid passes through the membrane sheet 102 to form a permeate, while the liquid that has not passed through (i.e., the concentrated liquid) continues to flow into the next separation membrane module 100, and the above operation is repeated, and finally efficient filtration and concentration are achieved. The permeate obtained inside the plurality of membrane sheets 102 in each separation membrane module 100 is drained to the outside of the housing 101 through the drainage hole 104 provided at the connection between the housing 101 and the plurality of membrane sheets 102. The design of the drainage hole 104 ensures that the permeate can be discharged smoothly, while preventing cross contamination between the liquid to be filtered and the permeate. The confluence member 202 is a key component connecting the housing 101 and the permeate pipeline 201, and is used to collect the permeate generated by the multiple separation membrane modules 100 and guide the permeate to flow into the permeate pipeline 201. The permeate pipeline 201 is a channel for collecting and transporting the permeate generated by the multiple separation membrane modules 100, and is used to transport the collected permeate to the subsequent processing system or storage container to ensure the continuity and efficiency of the filtration process.

[0058] The filtration device also includes: a flow meter 203 and a regulating valve 204, wherein the flow meter 203 and the regulating valve 204 are arranged at one end of the permeate pipeline 201, the flow meter 203 is used to detect the flow rate of the permeate corresponding to each separation membrane assembly in the multiple separation membrane assemblies 100, and the regulating valve 204 is used to cooperate with the flow meter 203 to adjust the flow rate of the permeate corresponding to each separation membrane assembly in the multiple separation membrane assemblies 100.

[0059] For example, Figure 6As shown, in the filtration device, the flow meter 203 and the regulating valve 204 are arranged at one end of the permeate pipeline 201, so as to facilitate the real-time monitoring and regulation of the permeate flow of the whole system. The permeate pipeline 201 is a key component for collecting the permeate produced by multiple separation membrane modules 100 and transporting it to subsequent processing or storage. Therefore, the flow meter 203 and the regulating valve 204 are arranged at this position to effectively control the flow balance of the whole system. Specifically, the flow meter 203 can measure the flow of the permeate in real time and provide accurate flow data for the operator. When multiple separation membrane modules 100 are operated in series, the flow meter 203 can monitor the permeate flow of each module to ensure that the flow is evenly distributed among the modules. If the flow of a certain module is abnormal (for example, the flow is too high or too low), it may indicate that the module has fouling or other problems. The main function of the regulating valve 204 (such as a manual regulating valve, an automatic regulating valve, etc.) is to cooperate with the flow meter 203 to regulate the flow of the permeate. Specifically, the regulating valve 204 can be a manual regulating valve, that is, the regulating valve 204 can be manually adjusted according to the reading of the flow meter 203; the regulating valve 204 can also be an automatic regulating valve, that is, the regulating valve 204 can automatically adjust the opening and closing degree according to the reading of the flow meter 203. The regulating valve 204 can control the flow of the permeate to ensure that the permeate flow of each separation membrane assembly 100 remains within the optimal range, avoiding the membrane surface fouling caused by excessive flow or the filtration efficiency being affected by too low flow. The regulating valve 204 can also be used to protect the system from damage caused by excessive pressure or flow. For example, when the flow increases abnormally, the flow can be reduced in time through the regulating valve 204 to prevent the system from overloading.

[0060] It should be noted that if Figure 6 As shown, the filtering device also includes: a feed tank 205, a feed pump 206, a circulation pump 207, a backwash liquid tank 208 and a backwash pump 209, etc. The liquid to be filtered enters the feed tank 205 for storage, is pumped into the filtering device by the feed pump 206, and enters the separation membrane assembly 100 after being pressurized by the circulation pump 207. Inside the separation membrane assembly 100, the liquid in the liquid to be filtered passes through the multiple membranes 102 under pressure and is drained to the outside of the housing 101 to form a permeate, and the solid particles in the liquid to be filtered are intercepted by the multiple membranes 102 and are taken out of the separation membrane assembly 100 with the circulating feed liquid to form a concentrated liquid. The concentrated liquid is transported to the inlet of the circulation pump 207 by a pipeline and is transported to the inside of the separation membrane assembly 100 by pressurization again. In this process, permeate is continuously extracted from the liquid to be filtered, and the liquid to be filtered is gradually concentrated. When it reaches a certain concentration, the concentrated liquid is discharged from the filtering device, and a new concentration process is carried out again, or the concentrated liquid is continuously discharged at a certain flow rate.

[0061] It should be noted that if Figure 6As shown, the filtration device is also equipped with backwashing measures, in which a portion of the permeate is stored in the backwash liquid tank 208, and the backwash pump 209 is used to pressurize and pump it into the separation membrane component 100 to backwash the multiple membranes 102. The dirt and blockages peeled off by the backwashing enter the circulating feed liquid and are taken out of the separation membrane component 100. The backwashing operation can effectively restore the flux of the multiple membranes 102 and the filtration performance of the filtration device.

[0062] The filtration device provided in the present application includes a plurality of separation membrane modules 100, a permeate pipeline 201 and a flow collecting member 202. The plurality of separation membrane modules 100 are connected in series end to end. Each separation membrane module 100 includes a plurality of membrane sheets 102 and a housing 101. The housing 101 of each separation membrane module 100 is connected to the permeate pipeline 201 through the flow collecting member 202. The plurality of membrane sheets 102 in each separation membrane module 100 are arranged inside the housing 101 along the length direction of the housing 101, and at least one end of each membrane sheet 102 is connected to the inner wall of the housing 101. At the same time, there is a feed flow channel 103 between two adjacent membrane sheets 102. During the period when the liquid to be filtered flows along the feed flow channel 103, the plurality of membrane sheets 102 in the separation membrane module 100 can filter the liquid to be filtered to obtain a permeate. In addition, at least one drainage hole 104 is correspondingly provided at the connection between the housing 101 and each membrane 102 for draining the permeate obtained inside the plurality of membranes 102 to the outside of the housing 101 and collecting it through the converging member 202 to flow into the permeate pipeline 201 .

[0063] By arranging the multiple membranes 102 of each separation membrane assembly 100 in the filter device inside the shell 101 along the length direction of the shell 101, the inner membrane area per unit volume of the separation membrane assembly 100 is increased, and the installation space of the separation membrane assembly 100 is saved. At the same time, by optimizing the flow channel structure of the separation membrane assembly 100, a lower flow rate can achieve effective shear force on the surface of the membrane 102, reducing the deposition of pollutants on the surface of the membrane 102. In addition, the feature of supporting backwashing makes the physical cleaning effect of multiple separation membrane assemblies 100 better, reduces the dependence on chemical cleaning, thereby extending the cleaning cycle, improving the filtration efficiency of the filtration device, and reducing the investment cost and operation cost of the filtration device.

[0064] It should be noted that the sequence of the above embodiments of the present application is only for description and does not represent the advantages or disadvantages of the embodiments.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0067] In the present application, unless otherwise specified, directional words such as "up" and "down" are generally used with reference to the directions shown in the drawings, or with reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are generally used with reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present application.

[0068] In this application, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "join", "hinge", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] The above is only an exemplary embodiment of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope recorded in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A separation membrane module, comprising: a housing having a predetermined length; as well as A plurality of membranes are arranged inside the shell along the length direction of the shell, at least one end of each of the plurality of membranes is connected to the inner wall of the shell, and a feed flow channel is provided between two adjacent membranes, and during the flow of the liquid to be filtered along the feed flow channel, the plurality of membranes can filter the liquid to be filtered so as to obtain permeate inside the plurality of membranes, wherein: At least one drainage hole is correspondingly arranged at the connection between the shell and each membrane, and the drainage hole is used to lead the permeate obtained inside the corresponding membrane out of the separation membrane assembly.

2. The separation membrane module according to claim 1, wherein At least one end of each of the plurality of diaphragms is bonded and sealed to the inner wall of the shell by means of a sealant.

3. The separation membrane module according to claim 1, wherein Each of the plurality of diaphragms is in a flat plate shape, and the plurality of diaphragms are distributed in parallel or at a predetermined angle.

4. The separation membrane module according to claim 3, wherein When the plurality of membranes are distributed in parallel, the distances between two adjacent membranes are equal.

5. The separation membrane module according to claim 1, wherein The separation membrane module has an inlet and an outlet, and a guide ring is arranged at the inlet.

6. The separation membrane module according to claim 5, wherein The guide ring and the shell are distributed in an integrated manner or in a separate manner.

7. The separation membrane module according to any one of claims 1 to 6, wherein A guide plate is provided on a side of each of the plurality of membranes corresponding to the inflow direction of the liquid to be filtered.

8. The separation membrane module according to claim 7, wherein The guide plate is made of metal material or engineering plastic material; or the guide plate is obtained by locally thickening or locally strengthening one side of each membrane corresponding to the inflow direction of the liquid to be filtered.

9. The separation membrane module according to claim 1, wherein The shell is cylindrical in shape.

10. A filtering device comprising: A plurality of separation membrane modules according to any one of claims 1 to 9; Permeate pipeline; as well as A flow-collecting component, wherein the plurality of separation membrane assemblies are connected in series end to end, the shell of each of the plurality of separation membrane assemblies is connected to the permeate pipeline via the flow-collecting component, and the permeate obtained inside the plurality of membrane sheets of each of the plurality of separation membrane assemblies can be drained to the outside of the shell through the drainage holes and collected by the flow-collecting component to flow into the permeate pipeline.

11. The filtering device according to claim 10, further comprising: A flow meter and a regulating valve, wherein the flow meter and the regulating valve are arranged at one end of the permeate pipeline, the flow meter is used to detect the flow rate of the permeate corresponding to each separation membrane assembly in the multiple separation membrane assemblies, and the regulating valve is used to cooperate with the flow meter to regulate the flow rate of the permeate corresponding to each separation membrane assembly in the multiple separation membrane assemblies.

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