Hollow fiber composite nanofiltration membrane

Abstract

The utility model relates to the technical field of nanofiltration membranes, and discloses a hollow fiber composite nanofiltration membrane which comprises a main body shell and a pressure-resistant mechanism, the pressure-resistant mechanism for resisting water flow tearing is arranged in the middle of the inner side of the main body shell, and the pressure-resistant mechanism comprises a central pipe, a partition plate, a water passing mesh plate, an outer supporting layer, a buffer layer, a diversion trench and an inner supporting layer, through cooperation of all parts of the compression-resistant mechanism, the flowing resistance of water flow in the membrane can be increased, direct impact of the water flow on the membrane is reduced, so that the stability of the membrane under the impact of the water flow is improved, the nanofiltration membrane can be divided into a front part and a rear part which are independent, and the water flow buffering effect is achieved to a certain extent through the partition plate; after passing through the previous group of diaphragms, water flow is buffered and rectified by the partition plate and then uniformly flows to the next group of diaphragms, so that direct impact and non-uniform stress of the water flow on the diaphragms are reduced, and the risk that the diaphragms are broken and fractured due to impact of the water flow is reduced.

Description

Technical Field

[0001] This utility model relates to the field of nanofiltration membrane technology, specifically a hollow fiber composite nanofiltration membrane. Background Technology

[0002] Nanofiltration membranes are functional semi-permeable membranes that allow solvent molecules, certain low-molecular-weight solutes, or low-valence ions to pass through. They are a special and promising type of separation membrane, named for their ability to retain substances approximately in the nanometer range. They are used to remove organic matter and color from surface water, reduce hardness in groundwater, partially remove dissolved salts, concentrate fruit juices, and separate useful substances from pharmaceuticals.

[0003] Existing nanofiltration membranes are often multi-layered composites within the filter element, resulting in poor internal support and shock resistance. Under high-pressure operating conditions or when subjected to water flow impact, the membrane is prone to rupture or breakage, thus affecting the stable operation and lifespan of the nanofiltration membrane system.

[0004] Therefore, we propose a hollow fiber composite nanofiltration membrane to address the aforementioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a hollow fiber composite nanofiltration membrane to solve the problems mentioned in the background art. Existing nanofiltration membranes often have multiple layers composited inside the filter element, resulting in poor internal support and impact resistance. Under high-pressure operating conditions or when subjected to water flow impact, the membrane is prone to rupture or breakage during use, thus affecting the stable operation and service life of the nanofiltration membrane system.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hollow fiber composite nanofiltration membrane, comprising a main shell and a pressure-resistant mechanism. The pressure-resistant mechanism for resisting water flow tearing is disposed in the inner middle of the main shell. The pressure-resistant mechanism includes a central tube, a partition plate, a water-passing mesh plate, an outer support layer, a buffer layer, a flow guide groove, and an inner support layer. A partition plate is installed in the middle of the surface of the central tube, and a water-passing mesh plate is disposed in the middle of the surface of the partition plate. An outer support layer is disposed on the outermost side of the central tube, and a buffer layer is disposed below the outer support layer. A flow guide groove is formed on the surface of the buffer layer, and an inner support layer is disposed on the innermost side of the central tube.

[0007] Preferably, the inner surface of the outer support layer is in close contact with the outer surface of the buffer layer, and the guide groove is arranged in an S-shape through the buffer layer.

[0008] Preferably, a water inlet is connected to one side of the outer shell of the main body, and a water outlet is connected to the other side of the outer shell of the main body. A concentrated water outlet is provided above the water outlet, and the water outlet is connected to the central pipe.

[0009] Preferably, the inner side of the pressure-resistant mechanism is provided with a composite mechanism for reinforcement, the composite mechanism including an ultrafiltration layer and a hollow fiber layer, and the hollow fiber layer is attached to the upper side of the ultrafiltration layer.

[0010] Preferably, the composite structure further includes an electrolytic coating, which is attached to the upper side of the hollow fiber layer.

[0011] Preferably, the composite structure further includes a nano-coating, and the outermost layer of both the outer support layer and the inner support layer is provided with a nano-coating.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model, through the cooperation between the various parts of the anti-pressure mechanism, can increase the flow resistance of water in the membrane, reduce the direct impact of water flow on the membrane, thereby improving the stability of the membrane under the impact of water flow. It can also divide the nanofiltration membrane into two independent parts, and the partition plate can play a buffering role for water flow to a certain extent. After the water flows through the first set of membranes, it is buffered and rectified by the partition plate, and then flows evenly to the second set of membranes. This reduces the direct impact of water flow on the membranes and uneven stress, and reduces the risk of membrane rupture or breakage due to water flow impact.

[0014] 2. This utility model, through its composite mechanism, can adsorb target substances through electrostatic action, thereby improving the filtration effect of nanofiltration membranes. It can also enhance the tensile strength and toughness of the membrane while ensuring the membrane's adsorption capacity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of a hollow fiber composite nanofiltration membrane according to the present invention;

[0016] Figure 2 This is a partial cross-sectional three-dimensional structural diagram of the inner side of a hollow fiber composite nanofiltration membrane according to the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the separator plate of a hollow fiber composite nanofiltration membrane according to the present invention;

[0018] Figure 4 This utility model relates to a hollow fiber composite nanofiltration membrane. Figure 3 Enlarged structural diagram at point A in the middle.

[0019] In the diagram: 1. Main body shell; 2. Inlet; 3. Concentrate outlet; 4. Outlet; 5. Pressure-resistant mechanism; 501. Central pipe; 502. Separator plate; 503. Water flow mesh plate; 504. Outer support layer; 505. Buffer layer; 506. Flow guide channel; 507. Inner support layer; 6. Composite mechanism; 601. Ultrafiltration layer; 602. Hollow fiber layer; 603. Electrolytic coating; 604. Nano coating. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1-3 As shown, a hollow fiber composite nanofiltration membrane includes a main shell 1 and a pressure-resistant mechanism 5. The pressure-resistant mechanism 5, which is used to resist water flow tearing, is located in the middle of the inner side of the main shell 1. The pressure-resistant mechanism 5 includes a central tube 501, a partition plate 502, a water-passing mesh plate 503, an outer support layer 504, a buffer layer 505, a flow guide channel 506, and an inner support layer 507. The partition plate 502 is installed in the middle of the surface of the central tube 501, and the water-passing mesh plate 503 is provided in the middle of the surface of the partition plate 502. The outer support layer 504 is provided on the outermost side of the central tube 501, and the buffer layer 505 is provided below the outer support layer 504. The flow guide channel 506 is opened on the surface of the buffer layer 505. The inner support layer 507 is provided on the innermost side of the central tube 501. The inner surface of the outer support layer 504 is closely attached to the outer surface of the buffer layer 505, and the flow guide channel 506 is S-shaped and runs through the buffer layer 505.

[0022] The outer support layer 504 and the inner support layer 507, both of which are made of polyvinylidene fluoride (PVDF) as the nanofiltration membrane substrate, are connected by a buffer layer 505 and a flow guide 506. When water flows through the S-shaped curved flow guide 506, the flow resistance within the membrane is increased, reducing the direct impact of the water flow on the membrane and thus improving the membrane's stability under water flow impact. The separator plate 502 and the water flow mesh plate 503 divide the nanofiltration membrane into two independent parts. When water flows, the separator plate 502 can buffer the water flow to a certain extent, so that after the water flows through the first set of membranes, it is buffered and rectified by the separator plate 502 and then flows evenly to the second set of membranes, reducing the direct impact of the water flow on the membranes and the uneven stress, thus reducing the risk of the membranes rupture or breakage due to water flow impact.

[0023] like Figure 1 , Figure 3 and Figure 4As shown, an inlet 2 is connected to one side of the outer shell 1, and an outlet 4 is connected to the other side of the outer shell 1. A concentrated water outlet 3 is provided above the outlet 4, and the outlet 4 is connected to the central pipe 501. Water to be treated is introduced into the outer shell 1 through the inlet 2. After being filtered by the nanofiltration membrane, the product water is collected in the central pipe 501 and flows out through the outlet 4. The concentrated liquid obtained by filtration is discharged through the concentrated water outlet 3.

[0024] The inner side of the pressure-resistant mechanism 5 is provided with a composite mechanism 6 for reinforcement. The composite mechanism 6 includes an ultrafiltration layer 601 and a hollow fiber layer 602. The hollow fiber layer 602 is attached to the upper side of the ultrafiltration layer 601. The composite mechanism 6 also includes an electrolytic coating 603. The electrolytic coating 603 is attached to the upper side of the hollow fiber layer 602. The composite mechanism 6 also includes a nano coating 604. The outermost layer of the outer support layer 504 and the inner support layer 507 are both provided with a nano coating 604.

[0025] The ultrafiltration layer 601 and hollow fiber layer 602 of the existing technology can be used to deeply filter water. The electrolytic coating 603, which is an electrolyte coating, can adsorb target substances through electrostatic interaction to improve the filtration effect of the nanofiltration membrane. The nano coating 604, which is one or more additives such as titanium dioxide nanoparticles and carbon fibers, can not only ensure the adsorption capacity of the membrane, but also help to further enhance and improve the tensile strength and toughness of the membrane.

[0026] Working principle: When using this hollow fiber composite nanofiltration membrane, water to be treated is first introduced into the main body shell 1 through the inlet 2. Then, the water undergoes initial filtration through the outer support layer 504 and the inner support layer 507. Next, the water flows through the buffer layer 505 and the guide channel 506. As the water flows through the S-shaped bend in the guide channel 506, the flow resistance within the membrane is increased. Finally, the separator plate 502 and the water-passing mesh plate 503 divide the nanofiltration membrane into two independent parts. During water flow, the separator plate... 502 can provide a certain buffer, so that after the water flows through the previous set of membranes, it is buffered and rectified by the separator 502 and then flows evenly to the next set of membranes. At this time, the water can be deeply filtered through the existing ultrafiltration layer 601 and hollow fiber layer 602, as well as the electrolytic coating 603 and nano coating 604. Then, through the outlet 4, the product water after being filtered by the nanofiltration membrane group can be collected into the central tube 501 and flow out. Finally, the concentrated liquid obtained by filtration can be discharged through the concentrated water outlet 3.

[0027] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hollow fiber composite nanofiltration membrane comprising a main body housing (1) and a pressure resistance mechanism (5), characterized in that: The anti-pressure mechanism (5) for resisting water flow tearing is arranged in the middle part of the inner side of the main body shell (1), the anti-pressure mechanism (5) comprises a center tube (501), a partition plate (502), a water passing net plate (503), an outer support layer (504), a buffer layer (505), a flow guide groove (506) and an inner support layer (507), the surface middle part of the center tube (501) is provided with the partition plate (502), and the surface middle part of the partition plate (502) is provided with the water passing net plate (503), the outermost side of the center tube (501) is provided with the outer support layer (504), and the lower part of the outer support layer (504) is provided with the buffer layer (505), the surface of the buffer layer (505) is provided with the flow guide groove (506), and the innermost side of the center tube (501) is provided with the inner support layer (507).

2. The hollow fiber composite nanofiltration membrane according to claim 1, characterized in that: The inner surface of the outer support layer (504) is tightly combined with the outer surface of the buffer layer (505), and the flow guide groove (506) is provided in an S-shaped penetrating mode.

3. The hollow fiber composite nanofiltration membrane according to claim 1, characterized in that: The outer side of the main body shell (1) is communicated with the water inlet (2), and the other outer side of the main body shell (1) is connected with the water outlet (4), the upper part of the water outlet (4) is provided with the concentrated water outlet (3), and the water outlet (4) and the center tube (501) are communicated.

4. The hollow fiber composite nanofiltration membrane according to claim 1, characterized in that: The inner side of the anti-pressure mechanism (5) is provided with a composite mechanism (6) for strengthening use, the composite mechanism (6) comprises an ultrafiltration layer (601) and a hollow fiber layer (602), and the upper side of the ultrafiltration layer (601) is combined with the hollow fiber layer (602).

5. The hollow fiber composite nanofiltration membrane according to claim 4, characterized in that: The composite mechanism (6) further comprises an electrolytic coating layer (603), and the upper side of the hollow fiber layer (602) is combined with the electrolytic coating layer (603).

6. The hollow fiber composite nanofiltration membrane according to claim 4, characterized in that: The composite mechanism (6) further comprises a nano coating layer (604), and the outermost layer of the outer support layer (504) and the inner support layer (507) is provided with the nano coating layer (604).

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