Nanofiltration membrane assembly

Abstract

The utility model relates to the technical field of nanofiltration membranes, and discloses a nanofiltration membrane assembly which comprises a water inlet pipe and a U-shaped pipe, nanofiltration membrane shells are arranged outside the two sides of the U-shaped pipe, first nanofiltration membranes are arranged in the nanofiltration membrane shells, a plug is arranged at one end of the U-shaped pipe, a buffer shell is arranged at the other end of the U-shaped pipe, the buffer shell is in a Z shape with one end higher than the other end, and the first nanofiltration membranes are arranged in the buffer shell. A water inlet pipe is arranged at the higher end of the buffer shell, the lower end of the buffer shell is connected with a U-shaped pipe, and a concentrated water connecting pipe and a pure water connecting pipe are arranged at one end of the nanofiltration membrane shell. After the buffer shell is filled with tap water, the tap water moves into the nanofiltration membrane shell through the U-shaped pipe, and air with pressure of the tap water is buffered through the buffer shell, so that the stability of water flow entering the U-shaped pipe is ensured, and impact damage to the nanofiltration membrane is avoided.

Description

Technical Field

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

[0002] Nanofiltration membrane is a separation membrane technology between ultrafiltration and reverse osmosis, used to remove a variety of dissolved substances and particles from water. The molecular weight cutoff range of nanofiltration membranes is roughly 200-1000 Daltons, which means that they can intercept substances that are smaller than ultrafiltration membranes but larger than reverse osmosis membranes. Nanofiltration membranes have a nanometer-scale microporous structure, usually with a pore size of about 1 nanometer, hence the name "nanofiltration". The operating pressure of nanofiltration is lower than that of reverse osmosis, so it is sometimes called low-pressure reverse osmosis. Nanofiltration membranes are widely used in drinking water treatment, wastewater reuse, extraction and concentration of useful substances in the food and pharmaceutical industries.

[0003] After searching, the Chinese utility model patent with publication number: CN209848682U discloses a nanofiltration membrane assembly, including a filter cover, a groove is provided at the bottom of the filter cover, a first conical cylinder is welded on the side wall of the groove, a second conical cylinder is movably installed on the inner side of the first conical cylinder, the same nanofiltration membrane body is fixedly pasted around the outer side of the second conical cylinder, a plurality of first holes are provided on the outer side of the second conical cylinder, and the plurality of first holes are all located on the inner side of the nanofiltration membrane body, a plurality of second holes are provided on the outer side of the first conical cylinder, and the plurality of second holes are arranged one-to-one with the plurality of first holes, a thread groove is provided on the side wall of the groove, an end cap is threadedly installed in the thread groove, and a turntable is welded on the bottom of the second conical cylinder. The utility model has reasonable design and simple structure, and can fit the nanofiltration membrane body tightly on the inner side of the first conical cylinder, and the nanofiltration membrane body can filter the water source, and the filtered impurities are retained in the filter cover, which is convenient for cleaning.

[0004] However, the water inlet of the nanofiltration membrane assembly in the above-mentioned prior art lacks a buffer component, resulting in fluctuations in the flow and pressure inside the nanofiltration membrane assembly when it is started. Excessive or rapid flow and pressure fluctuations may cause an extreme pressure drop in the membrane system, leading to water hammer, and thus causing the membrane element to rupture. Utility Model Content

[0005] The purpose of the utility model is to provide a nanofiltration membrane component to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a nanofiltration membrane assembly, comprising: a water inlet pipe and a U-shaped tube, nanofiltration membrane shells are provided on the outside of both sides of the U-shaped tube, a first nanofiltration membrane is provided inside the nanofiltration membrane shell, a plug is provided at one end of the U-shaped tube, and a buffer shell is provided at the other end, the buffer shell is in a Z shape with one end high and the other end low, a water inlet pipe is provided at the high end of the buffer shell, and the low end of the buffer shell is connected to the U-shaped tube, and a concentrated water connecting pipe and a pure water connecting pipe are provided at one end of the nanofiltration membrane shell.

[0007] Furthermore, one end of the pure water connecting pipe is located outside the first nanofiltration membrane, and one end of the concentrated water connecting pipe is located inside the first nanofiltration membrane.

[0008] Furthermore, one end of the concentrated water connecting pipe and the pure water connecting pipe is connected to a secondary filter housing, and a second nanofiltration membrane is provided inside the secondary filter housing.

[0009] Furthermore, a concentrated water drainage pipe is provided on one side of the secondary filter housing close to the concentrated water connecting pipe, and a pure water drainage pipe is provided on one side of the secondary filter housing close to the pure water connecting pipe.

[0010] Furthermore, the middle portion of the buffer shell is a rectangular shell, and an automatic pressure relief valve is provided at one end of the buffer shell close to the water inlet pipe.

[0011] Furthermore, the second nanofiltration membrane is located between the concentrated water connecting pipe and the pure water connecting pipe.

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

[0013] The utility model realizes that when the nanofiltration membrane assembly is used, the water inlet pipe is connected to the tap water pipeline, and the tap water enters the buffer shell through the water inlet pipe. Since the buffer shell is high at one end and low at the other end and is in a rectangular hollow shape in the middle, after the tap water enters the buffer shell, the air inside the tap water will first impact the buffer shell. When the buffer shell is filled with tap water, the tap water moves to the nanofiltration membrane shell through the U-shaped tube, and the air under the pressure of the tap water is buffered by the buffer shell, thereby ensuring the stability of the water flow entering the U-shaped tube and avoiding impact damage to the nanofiltration membrane.

[0014] Since a water outlet hole is opened on a section of the outer wall of the U-shaped tube inside the nanofiltration membrane housing, tap water enters the first nanofiltration membrane through the water outlet hole, and is filtered by the first nanofiltration membrane. The filtered concentrate water enters the concentrate water connecting pipe, and the pure water enters the pure water connecting pipe. The concentrate water connecting pipe sends the concentrate water into the secondary filtration housing, and is secondarily filtered by the second nanofiltration membrane inside the secondary filtration housing. The filtered pure water is discharged through the pure water drain pipe, and the concentrate water is discharged through the concentrate water drain pipe, thereby reducing the waste of concentrate water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of a nanofiltration membrane assembly of the utility model;

[0016] Figure 2 A three-dimensional diagram of a nanofiltration membrane assembly of the utility model from another perspective;

[0017] Figure 3 This is a cross-sectional view of a nanofiltration membrane assembly of the utility model;

[0018] Figure 4 It is a top view of a nanofiltration membrane assembly of the utility model.

[0019] In the figure: 1. water inlet pipe; 2. buffer shell; 3. U-shaped tube; 4. nanofiltration membrane shell; 5. secondary filtration shell; 6. concentrate water drain pipe; 7. plug; 8. pure water drain pipe; 9. first nanofiltration membrane; 10. second nanofiltration membrane; 11. concentrate water connecting pipe, 12. pure water connecting pipe. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] See also Figure 1-Figure 4 The utility model provides a technical solution: a nanofiltration membrane assembly, including: a water inlet pipe 1 and a U-shaped tube 3, nanofiltration membrane shells 4 are provided on the outside of both sides of the U-shaped tube 3, a first nanofiltration membrane 9 is provided inside the nanofiltration membrane shell 4, a plug 7 is provided at one end of the U-shaped tube 3, and a buffer shell 2 is provided at the other end, a water outlet hole is opened at a section of the outer wall of the U-shaped tube 3 inside the nanofiltration membrane shell 4, the buffer shell 2 is in a Z-shape with one end high and the other end low, a water inlet pipe 1 is provided at the high end of the buffer shell 2, and the low end of the buffer shell 2 is connected to the U-shaped tube 3, and a concentrated water connecting pipe 11 and a pure water connecting pipe 12 are provided at one end of the nanofiltration membrane shell 4. One end of the pure water connecting pipe 12 is located outside the first nanofiltration membrane 9, and one end of the concentrated water connecting pipe 11 is located inside the first nanofiltration membrane 9. The tap water pipeline is connected through the water inlet pipe 1, and the tap water enters the buffer shell 2 through the water inlet pipe 1. Since the buffer shell 2 is high at one end and low at the other end and has a rectangular hollow shape in the middle, after the tap water enters the buffer shell 2, the air inside the tap water will first impact the buffer shell 2. When the buffer shell 2 is filled with tap water, the tap water moves to the nanofiltration membrane housing 4 through the U-shaped tube 3. The air under the pressure of the tap water is buffered by the buffer shell 2 to ensure the smooth flow of water entering the U-shaped tube 3 and avoid impact damage to the nanofiltration membrane.

[0022] One end of the concentrated water connecting pipe 11 and the pure water connecting pipe 12 are connected to the secondary filter housing 5, and a second nanofiltration membrane 10 is provided inside the secondary filter housing 5. A concentrated water drainage pipe 6 is provided on the side of the secondary filter housing 5 close to the concentrated water connecting pipe 11, and a pure water drainage pipe 8 is provided on the side of the secondary filter housing 5 close to the pure water connecting pipe 12. Tap water enters the first nanofiltration membrane 9 through the water outlet hole, and the tap water is filtered by the first nanofiltration membrane 9. The filtered concentrated water enters the concentrated water connecting pipe 11, and the pure water enters the pure water connecting pipe 12. The concentrated water connecting pipe 11 sends the concentrated water into the secondary filter housing 5.

[0023] The middle part of the buffer shell 2 is a rectangular shell. An automatic pressure relief valve is provided at one end of the buffer shell 2 close to the water inlet pipe 1. When the pressure increase in the buffer shell 2 is greater than the set value of the automatic pressure relief valve, the automatic pressure relief valve automatically opens to discharge the air or water in the buffer shell 2, balancing the pressure in the buffer shell 2 and avoiding impact damage to the nanofiltration membrane.

[0024] The second nanofiltration membrane 10 is located between the concentrated water connection pipe 11 and the pure water connection pipe 12. Water enters the pure water connection pipe 12, and the concentrated water connection pipe 11 sends the concentrated water into the secondary filtration housing 5. The concentrated water is secondary filtered by the second nanofiltration membrane 10 inside the secondary filtration housing 5. The filtered pure water is discharged through the pure water drainage pipe 8, and the concentrated water is discharged through the concentrated water drainage pipe 6, thereby reducing the waste of concentrated water.

[0025] When the nanofiltration membrane assembly is in use, the tap water pipeline is connected through the water inlet pipe 1, and the tap water enters the buffer shell 2 through the water inlet pipe 1. Since the buffer shell 2 is high at one end and low at the other end and has a rectangular hollow shape in the middle, after the tap water enters the buffer shell 2, the air inside the tap water will first impact the buffer shell 2. When the buffer shell 2 is filled with tap water, the tap water moves to the nanofiltration membrane shell 4 through the U-shaped tube 3. The air under the pressure of the tap water is buffered by the buffer shell 2, ensuring the stability of the water flow entering the U-shaped tube 3 and avoiding impact damage to the nanofiltration membrane.

[0026] Since a water outlet hole is opened at a section of the outer wall of the U-shaped tube 3 inside the nanofiltration membrane housing 4, tap water enters the first nanofiltration membrane 9 through the water outlet hole, and the tap water is filtered by the first nanofiltration membrane 9. The filtered concentrate water enters the concentrate water connecting pipe 11, and the pure water enters the pure water connecting pipe 12. The concentrate water connecting pipe 11 sends the concentrate water into the secondary filtration housing 5, and the concentrate water is secondarily filtered through the second nanofiltration membrane 10 inside the secondary filtration housing 5. The filtered pure water is discharged through the pure water drain pipe 8, and the concentrate water is discharged through the concentrate drain pipe 6, thereby reducing the waste of concentrate water.

[0027] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. A nanofiltration membrane assembly, comprising: A water inlet pipe (1) and a U-shaped tube (3), characterized in that: nanofiltration membrane shells (4) are provided on the outside of both sides of the U-shaped tube (3), a first nanofiltration membrane (9) is provided inside the nanofiltration membrane shell (4), a plug (7) is provided at one end of the U-shaped tube (3), and a buffer shell (2) is provided at the other end, the buffer shell (2) is in a Z-shape with one end higher and the other end lower, the water inlet pipe (1) is provided at the higher end of the buffer shell (2), and the lower end of the buffer shell (2) is connected to the U-shaped tube (3), and a concentrated water connecting pipe (11) and a pure water connecting pipe (12) are provided at one end of the nanofiltration membrane shell (4).

2. A nanofiltration membrane assembly according to claim 1, characterized in that: One end of the pure water connecting pipe (12) is located outside the first nanofiltration membrane (9), and one end of the concentrated water connecting pipe (11) is located inside the first nanofiltration membrane (9).

3. A nanofiltration membrane assembly according to claim 2, characterized in that: One end of the concentrated water connecting pipe (11) and the pure water connecting pipe (12) is connected to a secondary filter housing (5), and a second nanofiltration membrane (10) is provided inside the secondary filter housing (5).

4. A nanofiltration membrane assembly according to claim 3, characterized in that: A concentrated water drainage pipe (6) is provided on the side of the secondary filter housing (5) close to the concentrated water connecting pipe (11), and a pure water drainage pipe (8) is provided on the side of the secondary filter housing (5) close to the pure water connecting pipe (12).

5. A nanofiltration membrane assembly according to claim 1, characterized in that: The middle part of the buffer shell (2) is a rectangular shell, and an automatic pressure relief valve is provided at one end of the buffer shell (2) close to the water inlet pipe (1).

6. A nanofiltration membrane assembly according to claim 3, characterized in that: The second nanofiltration membrane (10) is located between the concentrated water connecting pipe (11) and the pure water connecting pipe (12).

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