Hollow fiber membrane filter element with adjustable desalination rate

Abstract

A hollow fiber membrane filter element with adjustable desalination rate, comprising a shell and a filter membrane thread arranged in the shell, the shell having a water inlet and a clean water outlet, characterized in that the filter membrane thread comprises a first membrane thread and a second membrane thread separated from the first membrane thread, the desalination rate of the first membrane thread being greater than the desalination rate of the second membrane thread; a water outlet cover and an adjustment plate are arranged in the shell, the water outlet cover at least has a first through hole connected to the clean water end of the first membrane thread and a second through hole connected to the clean water end of the second membrane thread, the adjustment plate can be rotatably arranged on the water outlet cover and has at least a first adjustment hole connected to the first through hole and a second adjustment hole connected to the second through hole. Two membrane threads with different desalination rates are separated and arranged in the filter element, and the single desalination rate can be adjusted in combination with the rotational cooperation between the adjustment plate and the water outlet cover, which occupies a small volume and allows the membrane threads to be fully utilized.

Description

Technical Field

[0001] The invention relates to a water purification device, in particular to a filter element with a hollow fiber membrane inside. Background Art

[0002] At present, the mainstream RO membrane in the field of household water purification has a desalination rate of almost 100%. Due to the different water quality in different regions of my country, and people pay more attention to drinking water health, they require that appropriate calcium and magnesium ions be retained in drinking water. Nanofiltration membranes just meet this demand, but the desalination rate of nanofiltration membranes is often certain. At present, filter elements with different desalination rates are generally connected in parallel or in series to meet the demand for adjustable desalination rate. This method has the disadvantages of using a large number of filter elements and the filter elements cannot be fully utilized. Therefore, it is particularly important to develop a single nanofiltration filter element with adjustable desalination rate. For relevant literature, please refer to the Chinese utility model patent "Water purification equipment with appropriate retention of minerals" with patent number ZLCN201220279531.5 (authorization announcement number CN202766361U); you can also refer to the Chinese utility model patent "A water-saving water purification device with dual-mode filtration" with patent number ZL201820252734.2 (authorization announcement number CN208327550U). This patent filters the water flow three times through pretreatment, nanofiltration membrane, and reverse osmosis membrane, and uses an intelligent control device to control the regulating valve to increase the water output and water utilization rate. At the same time, the intelligent control device ensures that the total desalination rate is maintained at a stable value based on the data provided by the TDS value collector. Under the premise of ensuring that the quality of purified water meets the standards, the water output is maximized and the appropriate content of minerals and trace elements in the purified water is maintained. However, there are many filter elements, which occupy a large space and are expensive. There are also cases where individual filter elements are not fully utilized or cannot be utilized. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a single hollow fiber membrane filter element capable of achieving an adjustable desalination rate in view of the above technical status quo.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a hollow fiber membrane filter element with adjustable desalination rate, comprising a shell and a filter membrane thread arranged in the shell, the aforementioned shell has a water inlet and a clean water outlet, and is characterized in that the filter membrane thread comprises a first membrane thread and a second membrane thread separated from the first membrane thread, the desalination rate of the aforementioned first membrane thread is greater than the desalination rate of the second membrane thread; the shell is provided with a regulating valve that can adjust the clean water output of the first membrane thread and the clean water output of the second membrane thread, and the water output from the clean water end of the aforementioned first membrane thread merges with the water output from the clean water end of the second membrane thread and flows out from the clean water outlet.

[0005] Preferably, the regulating valve may include a water outlet cover and a regulating plate, the water outlet cover at least having a first through hole communicating with the water purification end of the first membrane filament and a second through hole communicating with the water purification end of the second membrane filament, the regulating plate rotatably disposed on the water outlet cover and at least having a first regulating hole communicating with the first through hole and a second regulating hole communicating with the second through hole;

[0006] The purified water of the first membrane fiber flows from the purified water end of the first membrane fiber through the first through hole and the first regulating hole in sequence to the purified water outlet, and the overlapping part of the first through hole and the first regulating hole is the flow gap of the purified water of the first membrane fiber;

[0007] The purified water of the second membrane fiber flows from the purified water end of the second membrane fiber through the second through hole and the second regulating hole in sequence to the purified water outlet, and the overlapping part of the second through hole and the second regulating hole is the flow gap of the purified water of the second membrane fiber.

[0008] Furthermore, the first membrane thread is arranged in a ring around the second membrane thread to be in a hollow cylindrical shape, and an isolation sleeve is provided between the water purification end of the first membrane thread and the water purification end of the second membrane thread. Of course, the first membrane thread and the second membrane thread can also be arranged at intervals, and the ratio can be set according to the adjustment needs, which can be half and half, or one quarter to three quarters, etc.

[0009] The water outlet cover and the isolating sleeve are preferably arranged as follows: a connecting ring is provided on a middle portion of a protruding portion of a side surface of the water outlet cover facing the filter membrane wire, and correspondingly, the isolating sleeve has a connecting portion that is seal-matched with the aforementioned connecting ring.

[0010] Furthermore, a central tube is provided in the middle of the shell, the central tube has an axial water inlet port and a lateral water outlet hole, and the second membrane filaments are arranged around the central tube.

[0011] For easy operation, the adjustment plate is provided with a columnar knob, which extends out of the housing and maintains sealed contact with the housing.

[0012] Furthermore, the shell includes an outer shell and a water outlet end cover, the outer shell is open at one end, the water outlet cover is sealingly arranged on the opening of the outer shell, and the water outlet end cover is arranged at the outer end of the water outlet cover and has the clean water outlet, and the knob extends out of the water outlet end cover and forms an operable driving end.

[0013] Furthermore, the shell includes a cylindrical body and a water inlet end cover arranged at one end of the body, the other end of the body is provided with the water outlet cover, the water inlet end cover is provided with the water inlet, and one side of the body is provided with a wastewater outlet.

[0014] Furthermore, the first membrane thread is arranged in a ring shape around the second membrane thread to present a hollow cylindrical shape, and an isolation sleeve is provided between the water purification end of the first membrane thread and the water purification end of the second membrane thread; a central tube is provided in the middle of the shell, and the central tube has an axial water inlet port and a lateral water outlet hole, and the second membrane thread is arranged around the central tube;

[0015] The raw water enters from the water inlet of the water inlet end cover, passes through the axial water inlet port and the lateral water outlet of the center tube in turn, and then enters the filter membrane for filtration.

[0016] Preferably, at least one of the first through hole, the first adjustment hole, the second through hole and the second adjustment hole is in a fan shape or a fan ring shape, or in an arc shape or other shapes.

[0017] Preferably, the first membrane filament is a nanofiltration membrane filament, and the second membrane filament is an ultrafiltration membrane filament.

[0018] Furthermore, the housing has a waste water outlet.

[0019] Compared with the prior art, the advantages of the present invention are: two membranes with different desalination rates are separated and arranged in the filter element, and the single desalination rate can be adjusted by combining the rotational cooperation between the adjustment plate and the water outlet cover, the occupied volume is small, and the membranes can be fully utilized. The internal structure of the filter element is simple, and the manufacturing process is relatively simple, which is easy to realize industrial production and can be widely used in the field of water purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of an embodiment.

[0021] Figure 2 This is an exploded view of an embodiment.

[0022] Figure 3 A cross-sectional view of an embodiment.

[0023] Figure 4 for Figure 2 Reverse view of the center outlet cover. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the hollow fiber membrane filter element with adjustable desalination rate in this embodiment includes a shell 1, a central tube 6, a regulating valve, an isolation sleeve 2 and a filter membrane filament 5 arranged in the shell 1.

[0026] The shell 1 includes a cylindrical body 11, a water outlet cover 13 and a water inlet cover 12. The water inlet cover 12 is arranged at one end of the body 11. A wastewater outlet 15 is opened on one side of the body 11. A water inlet 16 is opened on the water inlet cover 12. The water outlet cover 13 has a clean water outlet 14.

[0027] The filter membrane 5 in this embodiment includes a first membrane filament 51 and a second membrane filament 52 separated from the first membrane filament 51 . The desalination rate of the first membrane filament 51 is greater than that of the second membrane filament 52 . Both ends of the first membrane filament 51 and the second membrane filament 52 have a sealing layer.

[0028] In this embodiment, the first membrane filament 51 is a nanofiltration membrane filament, and the second membrane filament 52 is an ultrafiltration membrane filament. The desalination rate of the ultrafiltration membrane filament is 0%, and the desalination rate of the nanofiltration membrane filament is 95%. The flux of the two membrane filaments differs by 10 to 30 times.

[0029] The housing 1 is provided with a regulating valve which can adjust the purified water output of the first membrane filament 51 and the purified water output of the second membrane filament 52 . The purified water output of the first membrane filament 51 merges with the purified water output of the second membrane filament 52 and then flows out from the purified water outlet 14 .

[0030] The regulating valve in this embodiment includes a water outlet cover 3 and an adjusting plate 4. The water outlet cover 3 is sealingly arranged on the opening of the body 11, and the water outlet end cover 13 is arranged at the outer end of the water outlet cover 3. The water outlet cover 3 is provided with a first through hole 31 connected to the water purification end of the first membrane filament 51 and a second through hole 32 connected to the water purification end of the second membrane filament 52. The adjusting plate 4 is rotatably arranged on the water outlet cover 3 and is provided with a first adjusting hole 41 connected to the first through hole 31 and a second adjusting hole 42 connected to the second through hole 32. The adjusting plate 4 is provided with a columnar knob 43, which extends out of the water outlet end cover 13 and is formed with an operable driving end 44. The knob 43 maintains a sealed contact with the housing 1. The first through hole 31, the first adjusting hole 41, the second through hole 32 and the second adjusting hole 42 in this embodiment are all fan rings.

[0031] Combination Figure 4 As shown, a connecting ring 33 is provided on the middle part of a side surface of the water outlet cover 3 facing the filter membrane filament 5 , and correspondingly, the isolation sleeve 2 has a connecting portion 21 that is sealingly adapted to the connecting ring 33 .

[0032] The first membrane fibers 51 are arranged in a ring shape around the second membrane fibers 52 to be in a hollow cylindrical shape, and an isolation sleeve 2 is provided between the water purification end of the first membrane fibers 51 and the water purification end of the second membrane fibers 52 .

[0033] A central tube 6 is provided in the middle of the shell 1 . The central tube 6 has an axial water inlet port 62 and a lateral water outlet hole 61 . The second membrane filaments 52 are arranged around the central tube 6 .

[0034] The raw water enters from the water inlet 16 of the water inlet end cover 12, passes through the axial water inlet port 62 and the lateral water outlet hole 61 of the central tube 6 in sequence, and then enters the filter membrane filament 5 for filtration. Part of the water flows out from the clean water end of the first membrane filament, and part of the water flows out from the clean water end of the second membrane filament. After merging, the water flows out from the clean water outlet 14.

[0035] Here, the purified water of the first membrane filament 51 flows from the purified water end of the first membrane filament 51 through the first through hole 31 and the first regulating hole 41 to the purified water outlet 14, and the overlapping part of the first through hole 31 and the first regulating hole 41 is the flow gap of the purified water of the first membrane filament 51; Here, the purified water of the second membrane filament 52 flows from the purified water end of the second membrane filament 52 through the second through hole 32 and the second regulating hole 42 to the purified water outlet 14, and the overlapping part of the second through hole 32 and the second regulating hole 42 is the flow gap of the purified water of the second membrane filament 52. The size of the flow gap can be achieved by rotating the knob 43, thereby adjusting the desalination rate of the outlet water. The desalination rate of the filter element can be adjusted between 0 and 95%.

Claims

1. A hollow fiber membrane filter element with adjustable desalination rate, comprising a housing (1) and a filter membrane (5) arranged in the housing (1), wherein the housing (1) has a water inlet (16) and a clean water outlet (14), characterized in that The filtering membrane (5) comprises a first membrane (51) and a second membrane (52) separated from the first membrane (51), the desalination rate of the first membrane (51) being greater than the desalination rate of the second membrane (52); a regulating valve capable of regulating the purified water output of the first membrane (51) and the purified water output of the second membrane (52) is provided on the housing (1), the purified water output of the first membrane (51) and the purified water output of the second membrane (52) being combined and then flowing out from the purified water outlet (14); The regulating valve comprises a water outlet cover (3) and a regulating plate (4); the water outlet cover (3) is provided with at least a first through hole (31) communicating with the water purification end of the first membrane thread (51) and a second through hole (32) communicating with the water purification end of the second membrane thread (52); the regulating plate (4) is rotatably arranged on the water outlet cover (3) and is provided with at least a first regulating hole (41) communicating with the first through hole (31) and a second regulating hole (42) communicating with the second through hole (32); The purified water of the first membrane filament (51) flows from the purified water end of the first membrane filament (51) through the first through hole (31) and the first regulating hole (41) in sequence to the purified water outlet (14), and the overlapping portion of the first through hole (31) and the first regulating hole (41) is the flow gap of the purified water of the first membrane filament (51); The purified water of the second membrane filament (52) flows from the purified water end of the second membrane filament (52) through the second through hole (32) and the second regulating hole (42) in sequence to the purified water outlet (14), and the overlapping portion of the second through hole (32) and the second regulating hole (42) is the flow gap of the purified water of the second membrane filament (52); The adjustment plate (4) is provided with a columnar knob (43), which extends out of the housing (1) and maintains sealed contact with the housing (1).

2. The hollow fiber membrane filter element with adjustable desalination rate according to claim 1, characterized in that The first membrane thread (51) is arranged in a ring shape around the second membrane thread (52) to present a hollow cylindrical shape, and an isolation sleeve (2) is provided between the water purification end of the first membrane thread (51) and the water purification end of the second membrane thread (52).

3. The hollow fiber membrane filter element with adjustable desalination rate according to claim 2, characterized in that The water outlet cover (3) is provided with a connecting ring (33) protruding in the middle of a side surface facing the filter membrane wire (5), and correspondingly, the isolation sleeve (2) has a connecting portion that is sealingly adapted to the connecting ring (33).

4. The hollow fiber membrane filter element with adjustable desalination rate according to claim 2 or 3, characterized in that A central tube (6) is provided in the middle of the shell (1), and the central tube (6) has an axial water inlet port (62) and a lateral water outlet hole (61), and the second membrane filaments (52) are arranged around the central tube (6).

5. The hollow fiber membrane filter element with adjustable desalination rate according to claim 1, characterized in that The housing (1) comprises an outer shell and a water outlet cover (13); one end of the outer shell is open; the water outlet cover (3) is sealingly arranged on the opening of the outer shell; the water outlet cover (13) is arranged at the outer end of the water outlet cover (3) and has the clean water outlet (14); the knob (43) extends out of the water outlet cover (13) and is formed with an operable driving end (44).

6. The hollow fiber membrane filter element with adjustable desalination rate according to claim 5, characterized in that The shell comprises a cylindrical body (11) and a water inlet end cover (12) arranged at one end of the body (11), the other end of the body (11) is provided with the water outlet cover (3), the water inlet end cover (12) is provided with the water inlet (16), and one side of the body (11) is provided with a wastewater outlet (15).

7. The hollow fiber membrane filter element with adjustable desalination rate according to claim 6, characterized in that The first membrane thread (51) is arranged in a ring shape around the second membrane thread (52) to present a hollow cylindrical shape, and an isolation sleeve (2) is provided between the water purification end of the first membrane thread (51) and the water purification end of the second membrane thread (52); a central tube (6) is provided in the middle of the shell (1), and the central tube (6) has an axial water inlet port (62) and a lateral water outlet hole (61), and the second membrane thread (52) is arranged around the central tube (6); The raw water enters from the water inlet (16) of the water inlet end cover (12), passes through the axial water inlet port (62) and the lateral water outlet hole (61) of the central tube (6) in sequence, and then enters the filter membrane (5) for filtration.

8. The hollow fiber membrane filter element with adjustable desalination rate according to claim 1, characterized in that At least one of the first through hole (31), the first adjustment hole (41), the second through hole (32) and the second adjustment hole (42) is in the shape of a sector or a sector ring.

9. The hollow fiber membrane filter element with adjustable desalination rate according to claim 1, characterized in that The first membrane filament (51) is a nanofiltration membrane filament, and the second membrane filament (52) is an ultrafiltration membrane filament.

10. The hollow fiber membrane filter element with adjustable desalination rate according to claim 1, characterized in that The housing (1) has a waste water outlet (15).

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