Nanofiltration membrane

Abstract

The utility model discloses a nanofiltration membrane, which relates to the technical field of nanofiltration membranes, and comprises a support plate clamped in a cylinder, a first nanofiltration layer, a second nanofiltration layer and a third nanofiltration layer are inserted in the inner wall of the top of the support plate, and the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer are sequentially arranged from inside to outside. The diameter of the first nanofiltration layer is smaller than that of the second nanofiltration layer, and the diameter of the second nanofiltration layer is smaller than that of the third nanofiltration layer. During working, the first nanofiltration layer performs first-step filtration on a medium, the second nanofiltration layer performs second-step filtration on the medium, and the third nanofiltration layer performs third-time filtration on the medium, so that the medium is purified as far as possible by performing nanofiltration on the medium for multiple times; the pore diameters of the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer are sequentially reduced, impurities in the medium are subjected to nanofiltration step by step from large to small, the nanofiltration burden of the medium is reduced through multi-stage layered nanofiltration, and a nanofiltration membrane is not prone to being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of nanofiltration membranes, in particular to a nanofiltration membrane. Background Art

[0002] Nanofiltration membrane is a functional semipermeable membrane that allows solvent molecules or certain low molecular weight solutes or low-valent ions to pass through. It is a special and promising separation membrane variety, named because it can retain substances of about nanometer size. It retains organic matter with a molecular weight of about 150-500, and has a capacity of retaining soluble salts of 2-98%. The desalination of monovalent anion salt solutions is lower than that of high-valent anion salt solutions. It is used to remove organic matter and color from surface water, remove hardness from groundwater, partially remove soluble salts, concentrate fruit juice, and separate useful substances in medicines.

[0003] However, some existing nanofiltration membranes only use one material or nanofiltration materials with the same pore size for nanofiltration. During nanofiltration, if the pore size is too small and the impurities in the medium are too large, the impurities will clog the nanofiltration membrane and affect the nanofiltration effect. If the pore size is too large, the impurities will flow out through the nanofiltration holes, resulting in poor nanofiltration effect. At the same time, as the nanofiltration time increases, the pollutants in the medium can easily cause the nanofiltration components to be contaminated and thus affect the normal operation of the nanofiltration. Utility Model Content

[0004] The purpose of the present application is to provide a nanofiltration membrane to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a nanofiltration membrane, comprising a cylinder, a nanofiltration component is arranged inside the cylinder, the nanofiltration component is adapted to the cylinder, the nanofiltration component comprises a support plate clamped to the inside of the cylinder, a first nanofiltration layer, a second nanofiltration layer and a third nanofiltration layer are inserted on the inner wall at the top of the support plate, the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer are arranged in sequence from the inside to the outside, the diameter of the first nanofiltration layer is smaller than the diameter of the second nanofiltration layer, the diameter of the second nanofiltration layer is smaller than the diameter of the third nanofiltration layer, the pore size of the first nanofiltration layer is 2nm, the pore size of the second nanofiltration layer is 1.5nm, the pore size of the third nanofiltration layer is 1nm, the inside of the first nanofiltration layer, between the first nanofiltration layer and the second nanofiltration layer, and between the second nanofiltration layer and the third nanofiltration layer are all filled with activated carbon, a support block is arranged on the inner wall of the cylinder, and the support block is adapted to the support plate.

[0006] Preferably, the top outer walls of the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer are all connected with fixed plates, the size of the fixed plates is the same as the size of the support plate, the top outer wall of the support plate and the bottom outer wall of the fixed plate are both provided with installation grooves, the installation grooves are circular, and the installation grooves are respectively adapted to the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer.

[0007] Preferably, the top outer wall of the support plate and the bottom outer wall of the fixed plate are both provided with sealing gaskets, the sealing gaskets are respectively matched with the support plate and the fixed plate, and the thickness of the sealing gaskets is the same as the depth of the installation groove.

[0008] Preferably, the fixed disk is provided with a control tube leading into the first nanofiltration layer, the control tube is matched with the fixed disk, and a partition is provided at the bottom of the inner wall of the cylinder, the partition is matched with the cylinder.

[0009] Preferably, both ends of the cylinder are provided with a liquid inlet end and a liquid outlet end by threaded rotation, and the liquid inlet end and the liquid outlet end are both cylindrical. The liquid inlet end is provided with a liquid inlet pipe, and the liquid inlet pipe is inserted into the control tube, and the liquid outlet end is provided with a liquid outlet pipe that passes through the partition.

[0010] Preferably, the outer walls of the liquid inlet and the liquid outlet close to the cylinder are provided with sealing rings, and the sealing rings are respectively adapted to the liquid inlet, the liquid outlet and the cylinder, and the outer walls on both sides adjacent to the liquid inlet and the liquid outlet are provided with connecting grooves, and the outer walls of the connecting grooves are provided with external threads, and both ends of the inner wall of the cylinder are provided with internal threads adapted to the connecting grooves.

[0011] In summary, the technical effects and advantages of the utility model are:

[0012] 1. In the utility model, when working, the first nanofiltration layer performs the first step of filtering on the medium, the second nanofiltration layer performs the second step of filtering on the medium, and the third nanofiltration layer performs the third step of filtering on the medium. By performing nanofiltration on the medium multiple times, the medium is purified as much as possible, and the pore sizes of the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer are reduced in sequence, and the impurities in the medium are gradually nanofiltered from large to small. Through multi-stage layered nanofiltration, the nanofiltration burden of the medium is reduced, and the nanofiltration membrane is not easily damaged. The activated carbon filled between the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer adsorbs and purifies the medium, adsorbs the pollutants in the medium, and prevents the medium from contaminating the nanofiltration component.

[0013] 2. In the utility model, the nanofiltration layer is fixed by a supporting plate and a fixed plate. When the nanofiltration layer needs to be replaced, it is only necessary to remove the fixed plate to separately remove the first nanofiltration layer, the second nanofiltration layer and the third nanofiltration layer for replacement. It is more convenient to use. The mounting groove is convenient for the installation of the nanofiltration layer. During installation, it is only necessary to insert the nanofiltration layer into the mounting groove. The sealing gasket seals the connection between the supporting plate, the fixed plate and the nanofiltration layer to prevent leakage of the medium.

[0014] 3. In the utility model, the liquid inlet pipe is inserted into the control tube to facilitate medium input, and the liquid outlet pipe is inserted into the cylinder to facilitate medium output after nanofiltration. During nanofiltration, the medium enters the nanofiltration component through the liquid inlet pipe and is discharged through the liquid outlet pipe after nanofiltration, which is more convenient to use. The liquid inlet end and the liquid outlet end are connected to the cylinder through a connecting groove, which is convenient for disassembling the device and thus facilitating the replacement of the nanofiltration component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the main appearance structure in the embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of the structure of the nanofiltration component in the embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the appearance structure of the cylinder in the embodiment of the present application;

[0019] Figure 4 It is a schematic diagram of the internal structure of the cylinder in the embodiment of the present application.

[0020] In the figure: 1. cylinder; 2. support plate; 3. first nanofiltration layer; 4. second nanofiltration layer; 5. third nanofiltration layer; 6. fixed plate; 7. mounting groove; 8. sealing gasket; 9. support block; 10. control tube; 11. liquid inlet end; 12. liquid outlet end; 13. liquid inlet pipe; 14. liquid outlet pipe; 15. sealing ring; 16. connecting groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example: Reference Figure 1-4A nanofiltration membrane is shown, comprising a cylinder 1, a nanofiltration component is arranged inside the cylinder 1, the nanofiltration component is adapted to the cylinder 1, the nanofiltration component comprises a support plate 2 which is clamped inside the cylinder 1, a first nanofiltration layer 3, a second nanofiltration layer 4 and a third nanofiltration layer 5 are inserted on the inner wall at the top of the support plate 2, the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 are arranged in sequence from the inside to the outside, the diameter of the first nanofiltration layer 3 is smaller than the diameter of the second nanofiltration layer 4, the diameter of the second nanofiltration layer 4 is smaller than the diameter of the third nanofiltration layer 5, the pore size of the first nanofiltration layer 3 is 2 nm, the pore size of the second nanofiltration layer 4 is 1.5 nm, the pore size of the third nanofiltration layer 5 is 1 nm, the inside of the first nanofiltration layer 3, between the first nanofiltration layer 3 and the second nanofiltration layer 4, and between the second nanofiltration layer 4 and the third nanofiltration layer 5 are all filled with activated carbon, a support block 9 is arranged on the inner wall of the cylinder 1, and the support block 9 is adapted to the support plate 2.

[0023] By means of the above structure: when working, the cylinder 1 is connected to the medium conveying pipeline, and the medium is input into the cylinder 1. At this time, the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 filter the medium in turn, wherein the first nanofiltration layer 3 performs the first step of filtering the medium, the second nanofiltration layer 4 performs the second step of filtering the medium, and the third nanofiltration layer 5 performs the third step of filtering the medium. By nanofiltering the medium multiple times, the medium is purified as much as possible, and the pore sizes of the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 are reduced in turn, and the impurities in the medium are gradually nanofiltered from large to small. Through multi-level layered nanofiltration, the nanofiltration burden of the medium is reduced, and the nanofiltration membrane is not easily damaged. The activated carbon filled between the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 adsorbs and purifies the medium, adsorbs the pollutants in the medium, and prevents the medium from contaminating the nanofiltration component.

[0024] like Figure 2 As shown, the top outer walls of the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 are all plugged with a fixed disk 6, the size of the fixed disk 6 is the same as the size of the support disk 2, the top outer wall of the support disk 2 and the bottom outer wall of the fixed disk 6 are both provided with a mounting groove 7, the mounting groove 7 is circular, and the mounting groove 7 is respectively adapted to the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5, the top outer wall of the support disk 2 and the bottom outer wall of the fixed disk 6 are both provided with a sealing gasket 8, the sealing gasket 8 is respectively adapted to the support disk 2 and the fixed disk 6, and the sealing The thickness of the pad 8 is the same as the depth of the installation groove 7. The nanofiltration layer is fixed by the support plate 2 and the fixed plate 6. When the nanofiltration layer needs to be replaced, you only need to remove the fixed plate 6 to separately remove the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 for replacement, which is more convenient to use. The installation groove 7 is convenient for the installation of the nanofiltration layer. During installation, you only need to insert the nanofiltration layer into the installation groove 7, which is more convenient to operate. The sealing pad 8 seals the connection between the support plate 2, the fixed plate 6 and the nanofiltration layer to prevent the medium from leaking.

[0025] like Figure 4As shown, the fixed disk 6 is provided with a control tube 10 that passes into the first nanofiltration layer 3, and the control tube 10 is adapted to the fixed disk 6. A partition is provided at the bottom of the inner wall of the cylinder 1, and the partition is adapted to the cylinder 1. Both ends of the cylinder 1 are provided with a liquid inlet end 11 and a liquid outlet end 12 by threaded rotation. The liquid inlet end 11 and the liquid outlet end 12 are both cylindrical. The liquid inlet end 11 is provided with a liquid inlet tube 13, and the liquid inlet tube 13 is inserted into the control tube 10. The liquid outlet end 12 is provided with a liquid outlet tube 14 that penetrates the partition. The outer wall of the liquid inlet end 11 and the liquid outlet end 12 close to the cylinder 1 is provided with a sealing ring 15, and the sealing ring 15 is adapted to the liquid inlet end 11, the liquid outlet end 12, and the cylinder 1, respectively. The liquid inlet end 11 and the liquid outlet end 1 The outer walls of the adjacent two sides are both provided with connecting grooves 16, and the outer walls of the connecting grooves 16 are provided with external threads. Both ends of the inner wall of the cylinder 1 are provided with internal threads adapted to the connecting grooves 16. When working, the liquid inlet end 11 and the liquid outlet end 12 are connected to the cylinder 1 through the connecting grooves 16. During the connection process, the liquid inlet pipe 13 is inserted into the control pipe 10 for medium input, and the liquid outlet pipe 14 is inserted into the cylinder 1 for medium output after nanofiltration. During nanofiltration, the medium enters the nanofiltration component through the liquid inlet pipe 13, and is discharged through the liquid outlet pipe 14 after nanofiltration, which is more convenient to use. The liquid inlet end 11 and the liquid outlet end 12 are connected to the cylinder 1 through the connecting grooves 16, which is convenient for disassembling the device and thus facilitating the replacement of the nanofiltration component.

[0026] How this utility works:

[0027] During operation, the cylinder 1 is connected to the medium delivery pipeline, and the medium is input into the cylinder 1. At this time, the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 filter the medium in sequence, wherein the first nanofiltration layer 3 performs the first step of filtering the medium, the second nanofiltration layer 4 performs the second step of filtering the medium, and the third nanofiltration layer 5 performs the third step of filtering the medium. By performing nanofiltration on the medium multiple times, the medium is purified as much as possible, and the pore sizes of the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 are reduced in sequence, and the impurities in the medium are gradually nanofiltered from large to small. Through multi-stage layered nanofiltration, the nanofiltration burden of the medium is reduced, and the nanofiltration membrane is not easily damaged. The activated carbon filled between the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 adsorbs and purifies the medium, adsorbs the pollutants in the medium, and prevents the medium from contaminating the nanofiltration component;

[0028] The nanofiltration layer is fixed by the support plate 2 and the fixed plate 6. When the nanofiltration layer needs to be replaced, it is only necessary to remove the fixed plate 6 to remove the first nanofiltration layer 3, the second nanofiltration layer 4 and the third nanofiltration layer 5 separately for replacement, which is more convenient to use. The mounting groove 7 is convenient for the installation of the nanofiltration layer. During installation, it is only necessary to insert the nanofiltration layer into the mounting groove 7, which is more convenient to operate. The sealing gasket 8 seals the connection between the support plate 2, the fixed plate 6 and the nanofiltration layer to prevent leakage of the medium.

[0029] During operation, the liquid inlet end 11 and the liquid outlet end 12 are connected to the cylinder 1 through the connecting groove 16. During the connection process, the liquid inlet pipe 13 is inserted into the control pipe 10 to facilitate the input of the medium, and the liquid outlet pipe 14 is inserted into the cylinder 1 to facilitate the output of the medium after nanofiltration. During nanofiltration, the medium enters the nanofiltration component through the liquid inlet pipe 13, and is discharged through the liquid outlet pipe 14 after nanofiltration, which is more convenient to use. The liquid inlet end 11 and the liquid outlet end 12 are connected to the cylinder 1 through the connecting groove 16, which is convenient for disassembling the device and thus facilitating the replacement of the nanofiltration component.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nanofiltration membrane, comprising a cylinder (1), characterized in that: A nanofiltration component is arranged inside the cylinder (1), and the nanofiltration component is adapted to the cylinder (1). The nanofiltration component comprises a support plate (2) which is snap-fitted to the inside of the cylinder (1), and a first nanofiltration layer (3), a second nanofiltration layer (4) and a third nanofiltration layer (5) are inserted into the inner wall of the top of the support plate (2). The first nanofiltration layer (3), the second nanofiltration layer (4) and the third nanofiltration layer (5) are arranged in sequence from the inside to the outside. The diameter of the first nanofiltration layer (3) is smaller than the diameter of the second nanofiltration layer (4), and the second nanofiltration layer ( 4) has a diameter smaller than that of the third nanofiltration layer (5), the pore size of the first nanofiltration layer (3) is 2 nm, the pore size of the second nanofiltration layer (4) is 1.5 nm, and the pore size of the third nanofiltration layer (5) is 1 nm, the interior of the first nanofiltration layer (3), between the first nanofiltration layer (3) and the second nanofiltration layer (4), and between the second nanofiltration layer (4) and the third nanofiltration layer (5) are all filled with activated carbon, and the inner wall of the cylinder (1) is provided with a support block (9), and the support block (9) is adapted to the support plate (2).

2. A nanofiltration membrane according to claim 1, characterized in that: The top outer walls of the first nanofiltration layer (3), the second nanofiltration layer (4) and the third nanofiltration layer (5) are all plugged with fixed disks (6); the size of the fixed disk (6) is the same as that of the support disk (2); the top outer wall of the support disk (2) and the bottom outer wall of the fixed disk (6) are both provided with mounting grooves (7); the mounting grooves (7) are circular and are respectively adapted to the first nanofiltration layer (3), the second nanofiltration layer (4) and the third nanofiltration layer (5).

3. A nanofiltration membrane according to claim 2, characterized in that: The top outer wall of the support plate (2) and the bottom outer wall of the fixed plate (6) are both provided with sealing gaskets (8), the sealing gaskets (8) are respectively adapted to the support plate (2) and the fixed plate (6), and the thickness of the sealing gaskets (8) is the same as the depth of the mounting groove (7).

4. A nanofiltration membrane according to claim 2, characterized in that: The fixed disk (6) is provided with a control tube (10) passing into the interior of the first nanofiltration layer (3), and the control tube (10) is compatible with the fixed disk (6). The bottom of the inner wall of the cylinder (1) is provided with a partition, and the partition is compatible with the cylinder (1).

5. A nanofiltration membrane according to claim 4, characterized in that: Both ends of the cylinder (1) are provided with a liquid inlet end (11) and a liquid outlet end (12) which are screw-threadedly mounted thereon. The liquid inlet end (11) and the liquid outlet end (12) are both cylindrical. The liquid inlet end (11) is provided with a liquid inlet pipe (13) which is inserted into the interior of the control pipe (10). The liquid outlet end (12) is provided with a liquid outlet pipe (14) which penetrates the partition.

6. A nanofiltration membrane according to claim 5, characterized in that: The outer walls of the liquid inlet end (11) and the liquid outlet end (12) close to the cylinder (1) are both provided with sealing rings (15), and the sealing rings (15) are respectively matched with the liquid inlet end (11), the liquid outlet end (12), and the cylinder (1). The outer walls of the liquid inlet end (11) and the liquid outlet end (12) adjacent to each other are both provided with connecting grooves (16), and the outer walls of the connecting grooves (16) are provided with external threads, and both ends of the inner wall of the cylinder (1) are provided with internal threads matched with the connecting grooves (16).

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