Hollow fiber nanofiltration membrane for water treatment

Abstract

The utility model discloses a hollow fiber nanofiltration membrane for water treatment, and relates to the technical field of nanofiltration membrane filter elements, the hollow fiber nanofiltration membrane for water treatment comprises a membrane shell, the membrane shell is of a cylindrical structure with two open ends, the hollow fiber nanofiltration membrane is installed in the membrane shell, a first connector is installed at the top of the hollow fiber nanofiltration membrane, and a second connector is installed at the bottom of the hollow fiber nanofiltration membrane. The bottom end of the first connector is provided with a fixing ring through the inner wall of the membrane shell, a central pipe is arranged in the hollow fiber nanofiltration membrane, the top of the central pipe is a sealed end, the bottom of the central pipe is provided with a second connector, and the bottom of the second connector is provided with a sealing end. According to the scheme, the problems that in the using process of an existing water treatment hollow fiber nanofiltration membrane, due to the fact that the membrane shell is fixedly connected with the upper sealing head and the lower sealing head and cannot be detached, after the membrane shell is used for a period of time, external pressure type nanofiltration membrane tows in the membrane shell are difficult to clean or replace, and the membrane shell cannot be detached are solved. Therefore, the filtering effect of the hollow fiber nanofiltration membrane is influenced.

Description

Technical Field

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

[0002] Nanofiltration membrane technology is a novel membrane separation technology that has seen rapid development both domestically and internationally in recent years. Due to its low operating pressure and high flux, it has been widely used in food processing, chemical and pharmaceutical intermediate purification and separation, and water treatment.

[0003] As indicated by announcement number CN217662596U, an external pressure hollow fiber nanofiltration membrane module is described. This device comprises upper and lower end caps, upper and lower membrane bundle distribution plates, a membrane shell, external pressure nanofiltration membrane bundles, inner and outer cylindrical baffles, a water inlet at the lower end cap, a purified water outlet at the upper end cap, and a concentrated water outlet. During the separation process, the solution enters the lower end cap through the inlet, then flows into the membrane module through the guide holes on the lower membrane bundle distribution plate. After rising to the top of the inner cylindrical baffle, it flows downwards to the bottom of the outer cylindrical baffle, and then rises again to the upper membrane bundle distribution plate. After filtration by the nanofiltration membrane bundle, the purified water flows out of the membrane module from the purified water outlet at the upper end cap.

[0004] The above-mentioned device is fixedly connected to the upper and lower end caps during use and cannot be disassembled. This makes it difficult to clean or replace the external pressure nanofiltration membrane bundle inside the membrane housing after a period of use, which will affect the filtration effect of the hollow fiber nanofiltration membrane. Therefore, we propose a water treatment hollow fiber nanofiltration membrane to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a hollow fiber nanofiltration membrane for water treatment, in order to solve the problem mentioned in the background art that, during the use of existing hollow fiber nanofiltration membranes for water treatment, the membrane shell is fixedly connected to the upper and lower end caps and cannot be disassembled, making it difficult to clean or replace the external pressure nanofiltration membrane bundles inside the membrane shell after a period of use, thus affecting the filtration effect of the hollow fiber nanofiltration membrane.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hollow fiber nanofiltration membrane for water treatment, comprising a membrane shell, the membrane shell being a cylindrical structure open at both ends, a hollow fiber nanofiltration membrane installed inside the membrane shell, a first connector installed at the top of the hollow fiber nanofiltration membrane, a fixing ring installed at the bottom end of the first connector through the inner wall of the membrane shell, a central tube disposed inside the hollow fiber nanofiltration membrane, the top of the central tube being a sealed end, a second connector installed at the bottom of the central tube, an upper end cap threadedly connected to the upper part of the membrane shell, a lower end cap threadedly connected to the lower part of the membrane shell, an inlet pipe threadedly connected to the inner wall of the first connector, a drain pipe threadedly connected to the outer wall of the second connector, and sewage pipes installed on both sides of the bottom of the lower end cap, the sewage pipes being connected to the interior of the membrane shell.

[0007] Preferably, a first spring is installed around the upper inner wall of the membrane shell, a locking block is installed at the other end of the first spring, a locking groove is provided around the outer wall of the first connector, and a telescopic rod is installed inside the first spring.

[0008] Preferably, multiple sets of buffer components are installed inside the membrane shell. Each buffer component includes four second springs located around the inner wall of the membrane shell. A clamping plate is installed at the other end of each second spring. The clamping plate is arc-shaped and fits against the outer wall of the hollow fiber nanofiltration membrane. A fixing sleeve is installed inside each second spring. One end of the fixing sleeve is fixedly connected to the membrane shell, and the other end of the fixing sleeve is movably connected to a movable column. The other end of the movable column is fixedly connected to the clamping plate. The buffer components are located below the fixing ring and are evenly distributed inside the membrane shell.

[0009] Preferably, the bottom of the upper end cap is configured as an opening, the upper part of the membrane shell is provided with a first external thread, and the inner wall of the upper end cap is provided with a first internal thread groove, wherein the first external thread engages with the first internal thread groove.

[0010] Preferably, the top of the lower end cap is configured as an opening, the inner wall of the lower end cap is provided with a first internal thread, and the lower part of the membrane shell is provided with a first external thread groove, wherein the first internal thread engages with the first external thread groove.

[0011] Preferably, the upper end cap has a first through hole inside, the lower end cap has a second through hole inside, sealing rings are installed on the inner walls of the first through hole and the second through hole, and rubber pads are installed on the inner top of the upper end cap and the inner bottom of the lower end cap.

[0012] Preferably, the lower part of the water inlet pipe is provided with a second external thread, the inner wall of the first connector is provided with a second internal thread groove, the second external thread engages with the second internal thread groove, and a rubber ring is installed at the connection between the inner bottom of the first connector and the hollow fiber nanofiltration membrane.

[0013] Preferably, the upper part of the drain pipe is provided with a second internal thread, and the outer wall of the second connector is provided with a second external thread groove, wherein the second internal thread engages with the second external thread groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) This utility model facilitates the threaded connection between the membrane shell and the upper end cap by the meshing connection of the first external thread and the first internal thread groove, facilitates the threaded connection between the membrane shell and the lower end cap by the meshing connection of the first external thread and the first internal thread groove, facilitates the threaded connection between the first connector and the water inlet pipe by the meshing connection of the first internal thread and the first external thread groove, and facilitates the threaded connection between the second connector and the drain pipe by the meshing connection of the second external thread and the second internal thread groove. This solves the problem that in the existing water treatment hollow fiber nanofiltration membrane, the membrane shell is fixedly connected to the upper and lower end caps and cannot be disassembled, which makes it difficult to clean or replace the external pressure nanofiltration membrane bundle inside the membrane shell after a period of use, thus affecting the filtration effect of the hollow fiber nanofiltration membrane.

[0016] (2) After the first connector is initially positioned by the fixing ring, the locking block is locked in the slot under the elastic force of the first spring. The telescopic rod can provide guidance for the first spring, which facilitates further positioning of the hollow fiber nanofiltration membrane and facilitates the installation and replacement of the hollow fiber nanofiltration membrane.

[0017] (3) The hollow fiber nanofiltration membrane can be buffered by the combined action of multiple second springs and clamping plates, thereby buffering the impact pressure of water flow on the hollow fiber nanofiltration membrane, thus reducing the damage to the hollow fiber nanofiltration membrane and improving the service life of the hollow fiber nanofiltration membrane. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0020] Figure 3 This is a front cross-sectional view of the present invention.

[0021] Figure 4 This is a schematic diagram of the top cross-sectional structure of the present invention. Figure 1;

[0022] Figure 5 This is a schematic diagram of the top cross-sectional structure of the present invention. Figure 2 ;

[0023] In the diagram: 1. Membrane housing; 2. Fixing ring; 3. Hollow fiber nanofiltration membrane; 4. First connector; 5. First spring; 6. Locking block; 7. Locking groove; 8. Telescopic rod; 9. Second spring; 10. Clamping plate; 11. Fixing sleeve; 12. Movable column; 13. Central tube; 14. Second connector; 15. Upper end cap; 16. First external thread; 17. First internal thread groove; 18. First through hole; 19. Water inlet pipe; 20. Second external thread; 21. Second internal thread groove; 22. Rubber ring; 23. Lower end cap; 24. First internal thread; 25. First external thread groove; 26. Second through hole; 27. Drain pipe; 28. Second internal thread; 29. ​​Second external thread groove; 30. Rubber pad; 31. Sealing ring; 32. Sewage pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Please see Figure 1-5 This utility model provides an embodiment of a hollow fiber nanofiltration membrane for water treatment, comprising a membrane shell 1, which is a cylindrical structure open at both ends. A hollow fiber nanofiltration membrane 3 is installed inside the membrane shell 1. A first connector 4 is installed on the top of the hollow fiber nanofiltration membrane 3. A fixing ring 2 is installed at the bottom end of the first connector 4 through the inner wall of the membrane shell 1. The outer diameter of the first connector 4 is larger than the outer diameter of the hollow fiber nanofiltration membrane 3. The fixing ring 2 can limit the first connector 4, thereby positioning the hollow fiber nanofiltration membrane 3. A central tube 13 is provided inside the hollow fiber nanofiltration membrane 3. The top of the central tube 13 is a sealed end, and a second connector 14 is installed at the bottom of the central tube 13. An upper sealing head 15 is threadedly connected to the upper part of the membrane shell 1. Please refer to [link to relevant documentation]. Figure 3 The bottom of the upper end cap 15 is open. A first external thread 16 is installed on the upper part of the membrane shell 1. A first internal thread groove 17 is provided on the inner wall of the upper end cap 15. The first external thread 16 engages with the first internal thread groove 17. A lower end cap 23 is threadedly connected to the lower part of the membrane shell 1. Please refer to [link / reference]. Figure 3 The top of the lower end cap 23 is open, and the inner wall of the lower end cap 23 is fitted with a first internal thread 24. The lower part of the membrane shell 1 is provided with a first external thread groove 25. The first internal thread 24 and the first external thread groove 25 mesh with each other. The inner wall of the first connector 4 is threaded with a water inlet pipe 19. Please refer to [link / reference]. Figure 3The lower part of the inlet pipe 19 is equipped with a second external thread 20, and the inner wall of the first connector 4 is provided with a second internal thread groove 21. The second external thread 20 and the second internal thread groove 21 mesh with each other. A rubber ring 22 is installed at the connection between the inner bottom of the first connector 4 and the hollow fiber nanofiltration membrane 3. The rubber ring 22 can effectively improve the sealing performance of the connection between the inlet pipe 19 and the first connector 4. The outer wall of the second connector 14 is threaded with a drain pipe 27. Please refer to [link / reference]. Figure 3 The upper part of the drain pipe 27 is equipped with a second internal thread 28, and the outer wall of the second connector 14 is provided with a second external thread groove 29. The second internal thread 28 and the second external thread groove 29 engage. Please refer to [link / reference]. Figure 2 The upper end cap 15 has a first through hole 18 inside, and the lower end cap 23 has a second through hole 26 inside. Sealing rings 31 are installed on the inner walls of the first through hole 18 and the second through hole 26. Rubber gaskets 30 are installed on the inner top of the upper end cap 15 and the inner bottom of the lower end cap 23. The first through hole 18 facilitates the connection of the first connector 4 to the water inlet pipe 19, and the second through hole 26 facilitates the connection of the second connector 14 to the drain pipe 27. The sealing rings 31 effectively improve the connection between the first connector 4 and the water inlet pipe 19, as well as the connection between the second connector 14 and the drain pipe 27. The sealing at the connection between head 14 and drain pipe 27 prevents liquid leakage. The rubber gasket 30 effectively improves the connection strength and sealing between membrane shell 1 and upper end cap 15 and lower end cap 23. Drain pipes 32 are installed on both sides of the bottom of lower end cap 23. Drain pipes 32 are connected to the inside of membrane shell 1. During the separation process, after the solution enters the first connector 4 from the water inlet pipe 19, it is filtered through the hollow fiber nanofiltration membrane 3 and the central tube 13. The purified water flows out from the drain pipe 27 through the central tube 13 and the second connector 14. Most of the inorganic salts and other impurities are discharged through the drain pipe 32.

[0026] Please see Figure 4 A first spring 5 is installed around the inner wall of the upper part of the membrane housing 1. A locking block 6 is installed at the other end of the first spring 5. A locking groove 7 is provided around the outer wall of the first connector 4. A telescopic rod 8 is installed inside the first spring 5. After the fixing ring 2 initially positions the first connector 4, the locking block 6 is locked inside the locking groove 7 under the elastic force of the first spring 5. The telescopic rod 8 can provide guidance for the first spring 5, thereby facilitating further positioning of the hollow fiber nanofiltration membrane 3 and facilitating the installation and replacement of the hollow fiber nanofiltration membrane 3.

[0027] Please see Figure 2 and Figure 5Multiple buffer assemblies are installed inside the membrane housing 1. Each buffer assembly includes four second springs 9, which are located around the inner wall of the membrane housing 1. A clamping plate 10 is installed at the other end of each second spring 9. The clamping plate 10 is arc-shaped and fits against the outer wall of the hollow fiber nanofiltration membrane 3. A fixing sleeve 11 is installed inside each second spring 9. One end of the fixing sleeve 11 is fixedly connected to the membrane housing 1, and the other end of the fixing sleeve 11 is movably connected to a movable column 12. The other end of the movable column 12 is fixedly connected to the clamping plate 10. The buffer assemblies are located below the fixing ring 2 and are evenly distributed inside the membrane housing 1. When the high-pressure solution impacts the hollow fiber nanofiltration membrane 3, the combined action of the multiple second springs 9 and the clamping plate 10 can buffer the hollow fiber nanofiltration membrane 3, thereby buffering the impact pressure of the water flow on the hollow fiber nanofiltration membrane 3, reducing the damage to the hollow fiber nanofiltration membrane 3, and improving the service life of the hollow fiber nanofiltration membrane 3.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A water treatment hollow fibre nanofiltration membrane comprising a membrane housing (1), characterised in that: The membrane housing (1) is a cylindrical structure with openings at both ends. A hollow fiber nanofiltration membrane (3) is installed inside the membrane housing (1). A first connector (4) is installed on the top of the hollow fiber nanofiltration membrane (3). A fixing ring (2) is installed at the bottom end of the first connector (4) through the inner wall of the membrane housing (1). A central tube (13) is provided inside the hollow fiber nanofiltration membrane (3). The top of the central tube (13) is a sealed end. A second connector (14) is installed at the bottom of the central tube (13). An upper end cap (15) is threaded to the upper part of the membrane housing (1). A lower end cap (23) is threaded to the lower part of the membrane housing (1). A water inlet pipe (19) is threaded to the inner wall of the first connector (4). A drain pipe (27) is threaded to the outer wall of the second connector (14). Sewage pipes (32) are installed on both sides of the bottom of the lower end cap (23). The sewage pipes (32) are connected to the interior of the membrane housing (1).

2. The hollow fiber nanofiltration membrane for water treatment according to claim 1, characterized in that: A first spring (5) is installed around the upper inner wall of the membrane shell (1), a locking block (6) is installed at the other end of the first spring (5), a locking groove (7) is provided around the outer wall of the first connector (4), and a telescopic rod (8) is installed inside the first spring (5).

3. The hollow fiber nanofiltration membrane for water treatment according to claim 1, characterized in that: Multiple buffer components are installed inside the membrane shell (1). The buffer components include four second springs (9). The second springs (9) are located around the inner wall of the membrane shell (1). A clamping plate (10) is installed at the other end of the second spring (9). The clamping plate (10) is arc-shaped and fits against the outer wall of the hollow fiber nanofiltration membrane (3). A fixing sleeve (11) is installed inside the second spring (9). One end of the fixing sleeve (11) is fixedly connected to the membrane shell (1). The other end of the fixing sleeve (11) is movably connected to a movable column (12). The other end of the movable column (12) is fixedly connected to the clamping plate (10). The buffer components are located at the lower part of the fixing ring (2) and are evenly distributed inside the membrane shell (1).

4. The hollow fiber nanofiltration membrane for water treatment according to claim 1, characterized in that: The bottom of the upper end cap (15) is set as an opening, the upper part of the membrane shell (1) is equipped with a first external thread (16), the inner wall of the upper end cap (15) is provided with a first internal thread groove (17), and the first external thread (16) meshes with the first internal thread groove (17).

5. The hollow fiber nanofiltration membrane for water treatment according to claim 1, characterized in that: The top of the lower end cap (23) is set as an opening, the inner wall of the lower end cap (23) is provided with a first internal thread (24), and the lower part of the membrane shell (1) is provided with a first external thread groove (25), the first internal thread (24) and the first external thread groove (25) mesh with each other.

6. The hollow fiber nanofiltration membrane for water treatment according to claim 1, characterized in that: The upper end cap (15) has a first through hole (18) inside, and the lower end cap (23) has a second through hole (26) inside. Sealing rings (31) are installed on the inner walls of the first through hole (18) and the second through hole (26). Rubber pads (30) are installed on the inner top of the upper end cap (15) and the inner bottom of the lower end cap (23).

7. The hollow fiber nanofiltration membrane for water treatment according to claim 1, characterized in that: The lower part of the water inlet pipe (19) is provided with a second external thread (20), the inner wall of the first connecting head (4) is provided with a second internal thread groove (21), the second external thread (20) is engaged with the second internal thread groove (21), and the inner bottom of the first connecting head (4) is provided with a rubber ring (22) at the connection position of the hollow fiber nanofiltration membrane (3).

8. The hollow fiber nanofiltration membrane for water treatment according to claim 1, characterized in that: The upper part of the water outlet pipe (27) is provided with a second internal thread (28), the outer wall of the second connecting head (14) is provided with a second external thread groove (29), and the second internal thread (28) is engaged with the second external thread groove (29).

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