CN218516443U - Double-layer hollow black crystal fiber membrane filtering component - Google Patents

Abstract

The utility model relates to a hollow fiber membrane technical field particularly relates to double-deck cavity blackcrystal fiber membrane filtration, include: the filtering container is provided with a sewage discharge pipe and a water inlet hole; the fiber membrane component is arranged in the filtering container and comprises a plurality of double-layer hollow fiber membranes, and the first ends and the second ends of the double-layer hollow fiber membranes are connected with the water distribution disc; and the first end of the water inlet pipeline is connected to the water pump, and the second end of the water inlet pipeline is connected to the input end of the switching valve. The utility model discloses a double-deck membrane design of double-deck hollow fiber membrane makes the filtration route form two, when one of them filtration route blockked up, changeable another filtration route, in filterable, can carry out the back flush to membrane structure, makes the adnexed filth of membrane structure drop, forms the clearance effect to when this filtration route blockked up, switch the filtration route before returning once more, improve the efficiency of filtering the use, reduce and frequently dismantle the washing to membrane structure's relapse.

Description

Double-layer hollow black crystal fiber membrane filtering component

Technical Field

The utility model relates to a hollow fiber filtration membrane technical field particularly relates to double-deck cavity blackout fiber membrane filtering component.

Background

The hollow fiber membrane is widely applied to the coal chemical industry sewage treatment project due to the excellent separation performance, is generally applied to the pretreatment of reverse osmosis membrane (RO), and is also widely applied to the fields of chemical industry, electronics, pharmacy, domestic drinking water, sewage discharge and food industry.

The hollow fiber membrane filters macromolecules in the solute through the microporous structure of the hollow fiber membrane, and along with the increase of the filtering time, the attached dirt on the membrane surface forms a membrane layer, and along with the continuous adsorption and accumulation of solute molecules on the membrane surface, the filtering performance becomes poor, so that the pressure difference rises, the sewage cannot be effectively filtered, and the filtering membrane component needs to be replaced and cleaned frequently.

SUMMERY OF THE UTILITY MODEL

According to the utility model discloses the first aspect of purpose provides a double-deck cavity blackcrystal fiber membrane filtration module, include:

the filtering container is provided with a sewage discharge pipe and a water inlet hole;

the fiber membrane component is arranged in the filtering container and comprises a plurality of double-layer hollow fiber membranes, and the first ends and the second ends of the double-layer hollow fiber membranes are connected with the water distribution disc;

the first end of the water inlet pipeline is connected to the water pump, the second end of the water inlet pipeline is connected to the input end of the switching valve, the first output end of the switching valve is connected with the first water pipeline, and the second end of the switching valve is connected with the second water pipeline;

a water discharge pipeline;

the double-layer hollow fiber membrane comprises a hollow inner membrane and a hollow outer membrane, wherein the hollow outer membrane is positioned on the outer side of the hollow outer membrane, and an annular channel is formed between the hollow inner membrane and the hollow outer membrane;

the outer wall of the hollow outer membrane and the inner wall of the filtering container form a first cavity, a second cavity is formed inside the hollow inner membrane, the annular channel is isolated from the first cavity through the hollow outer membrane, and the annular channel is isolated from the second cavity through the hollow inner membrane;

the first water conveying pipeline is connected to the water inlet hole, so that the first cavity is communicated with the first water conveying pipeline, and the second water conveying pipeline is connected to the water distribution disc, so that the second water conveying pipeline is communicated with the second cavity;

the hollow outer membrane is set to have the void density gradually reduced from the first cavity to the annular channel;

the hollow inner membrane is set to have the void density gradually reduced from the second cavity to the annular channel;

the first end of the drainage pipeline is connected to the water distribution disc, so that the drainage pipeline is communicated with the annular channel.

Preferably, still include the controller, first water pipeline is equipped with first pressure sensor, second water pipeline is equipped with second pressure sensor, be equipped with first solenoid valve on the blow off pipe, the controller is set to when the pressure that first pressure sensor or second pressure sensor detected surpasss the threshold value, control the diverter valve switches output port, and in the time T after the diverter valve switches, first solenoid valve is controlled and is opened according to the preset state.

Preferably, the first solenoid valve is controlled to be opened in a pulse state.

Preferably, the pressure threshold of the first pressure sensor and the second pressure sensor is 1.5-2.0Mpa.

Preferably, a water distribution pipe is arranged on the water distribution disk above the double-layer hollow fiber membrane.

Preferably, the first end of the water distribution pipe is connected with the second water conveying pipeline, and the second end of the water distribution pipe is connected with the first cavity.

Preferably, the water distribution plate below the double-layer hollow fiber membrane is provided with a confluence box, a first end of the confluence box is communicated with the annular channel, a second end of the confluence box is connected with a drainage pipeline, and the hollow inner membrane penetrates through the confluence box and extends into the first cavity.

Preferably, a second electromagnetic valve is arranged at the lower end of the hollow inner membrane, so that the second cavity is connected with the first cavity through the second electromagnetic valve, and the second electromagnetic valve is set to be closed when the switching valve is switched to the second output end, and is opened or closed simultaneously with the first electromagnetic valve when the switching valve is switched to the first output end.

Preferably, the membrane structures of the hollow outer membrane and the hollow inner membrane respectively comprise three layers, the aperture of the first membrane structure is 150-250um, the aperture of the second membrane structure is 100-150um, and the aperture of the third membrane structure is 20-50um.

Preferably, the pore size density of the first membrane structure comprises a dense region and a sparse region.

Preferably, the length ratio of the porous area to the hydrophobic area is 1.

Compared with the prior art, the utility model provides a cavity blackcrystal fiber membrane filtration, through the double-layer membrane design of double-deck hollow fiber membrane, make and filter the route and form two, when one of them filtration route blockked up, changeable another filtration route, in filterable, can carry out the back flush to membrane structure, make the adnexed filth of membrane structure drop, form the clearance effect, and when this filtration route blockked up, switch back filtration route before once more, improve the efficiency of filtering and using, the reduction is to the frequent dismantlement washing of relapseing of membrane structure.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing.

Fig. 1 is a schematic view of a double-layer hollow black crystal fiber membrane filtration module shown in the present invention, wherein raw water is backwashed by a first filtration path.

Fig. 2 is a schematic view of the double-layer hollow black crystal fiber membrane filtration module of the present invention, wherein raw water is filtered by the first filtration path.

Fig. 3 is a schematic view of the double-layer hollow black crystal fiber membrane filtration module of the present invention, wherein raw water is backwashed by the second filtration path.

Fig. 4 is a schematic diagram of the double-layer hollow black crystal fiber membrane filtration module of the present invention, and raw water is filtered by the second filtration path.

Fig. 5 is a schematic view of an exemplary construction of a fibrous membrane assembly according to the present invention.

Fig. 6 is a schematic view of the membrane structure of the double-layer hollow fiber membrane according to the present invention.

Detailed Description

For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

The traditional hollow fiber membrane is usually in an external support type or an internal support type, external support type raw water passes through the hollow fiber membrane from the outside and enters the inside of the membrane, dirt is filtered to the outside of the membrane, and the dirt is gradually attached and accumulated along with the dirt on the outer side of the membrane structure to form a colloid membrane to cover the surface of the fiber membrane.

The utility model discloses aim at through setting up neotype double-deck hollow fiber membrane structure, when filtering pressure reaches the threshold value, switch and filter the route to realize the back flush to former filtration route, reduce and frequently dismantle the washing to relapse of membrane structure.

[ double-layer hollow black crystal fiber membrane filtration Module ]

The double-layer hollow blackcrystal fiber membrane filter assembly combined with the embodiment shown in fig. 1-4 and fig. 5 comprises a filter container 10, a fiber membrane assembly 20, a water inlet pipeline and a water outlet pipeline 20.

As shown in the figure, the water inlet pipeline comprises a main pipeline and two branch pipelines, and the main pipeline is connected with a water pump to pump raw water. The first water pipe 32 and the second water pipe 31 are connected to the two filtering paths, respectively, and the main pipe is connected to the first water pipe 32 and the second water pipe 31 through a switching valve 30.

Referring to the drawings, the filtering container 10 is provided with a sewage drain pipe 11 and a water inlet 322, and the fiber membrane module 20 is disposed in the filtering container 10. The fiber membrane module 20 includes a plurality of double-layer hollow fiber membranes, especially a black-crystal hollow fiber membrane, that is, a hollow fiber membrane made of a casting solution doped with graphene, so as to enhance the strength of the hollow fiber membrane and improve the effect of the N and P organic matters in the raw water and sewage treatment.

The fibrous membrane module 20 serves as a raw water separation filter element for filtering raw water entering the filter container 10 to trap contaminants in the filter container 10.

As an alternative example, in order to improve the filtration efficiency of the double-layered hollow fiber membrane, a plurality of double-layered hollow fiber membranes are distributed as a set of fiber membrane modules 20 as shown in fig. 5, and one or more sets of fiber membrane modules 20 are installed in the filtration vessel 10 according to the actual filtration flow rate of raw water.

Further, as shown in fig. 5, the first and second ends of the plurality of double-layered hollow fiber membranes are connected to the water distribution plate 23.

As an alternative example, the water distribution tray 23 at the upper end is connected to the top of the filtering container 10, and the water distribution tray 23 at the lower end is located at the lower portion of the filtering container 10.

As shown in connection with fig. 1-5, in particular, the double-layered hollow fiber membrane includes a hollow inner membrane 221 and a hollow outer membrane 222.

The hollow outer membrane 222 is located outside the hollow outer membrane 222, and an annular channel 223 is formed between the hollow inner membrane 221 and the hollow outer membrane 222.

In this way, the raw water may enter the annular passage 223 through the hollow outer membrane 222 from the outer wall of the hollow outer membrane 222 or the raw water may enter the annular passage 223 through the hollow inner membrane 221 from the inner wall of the hollow inner membrane 221, and as can be seen, the raw water may be filtered by the double-layered hollow fiber membrane through two paths.

In an alternative embodiment, the outer wall of the hollow outer membrane 222 and the inner wall of the filtering container 10 form the first cavity 101, the inner part of the hollow inner membrane 221 forms the second cavity 201, the annular channel 223 and the first cavity 101 are separated by the hollow outer membrane 222, and the annular channel 223 and the second cavity 201 are separated by the hollow inner membrane 221.

Further, the first water pipe 32 is connected to the water inlet 322, so that the first cavity 101 is communicated with the first water pipe, and the second water pipe 31 is connected to the water distribution plate 23, so that the second water pipe 31 is communicated with the second cavity 201.

Thus, the first water pipe 32 enters the first cavity 101 from the water inlet 322, and then enters the annular channel 223 through the filtration of the hollow outer membrane 222 to form a first filtration path, and the second water pipe 32 enters the second cavity 201 from the water distributor 21, and then enters the annular channel 223 through the filtration of the hollow inner membrane 221 to form a second filtration path.

As an alternative example, when the raw water passes through the hollow outer membrane 222 from the outside of the hollow outer membrane 222, there is a flushing effect on the hollow inner membrane 221, and when the raw water passes through the hollow inner membrane 221 from the inside of the hollow inner membrane 221, there is a flushing effect on the hollow outer membrane 222, and thus, the filth attached to the membrane structure can be backwashed, and the filth can be flushed and discharged.

In the example shown in fig. 6, in order to make the dirt attached to the membrane structure easily fall off during backwashing, the hollow outer membrane 222 is configured such that the void density gradually decreases from the first cavity 101 to the annular passage 223; the hollow inner membrane 221 is configured such that the void density decreases from the second cavity 201 to the annular channel 223.

Since the outer side of the membrane structure has a high void density and a weak binding ability with the attached matter, raw water is likely to fall off by the scouring action from the inner side of the membrane structure.

Referring to fig. 1 and 5, the water distribution plate 23 located above the double-layer hollow fiber membrane is provided with a water distribution pipe 21, a first end of the water distribution pipe 21 is connected to the second water conveying pipe 31, a second end of the water distribution pipe 21 is connected to the first cavity 101, and the water distribution plate 23 blocks the annular passage 223.

As an alternative example, the water distribution tray 23 located below the double-layered hollow fiber membrane is provided with a manifold box 231.

With reference to the drawings, a first end of the junction box 231 is communicated with the annular channel 223, a second end of the junction box 231 is connected with the drainage pipeline 12, and the hollow inner membrane 221 penetrates through the junction box 231 and extends into the first cavity 101.

Thus, after entering the first cavity 101 from the water inlet 322, the raw water can only pass through the hollow outer membrane 222 to enter the annular channel, and then enters the confluence box 231 from the annular channel 223 to be discharged from the drainage pipeline 12, so that the first filtering path and the second filtering path are relatively independent and cannot be in series flow.

In a further scheme, the first water pipe 32 is provided with a first pressure sensor 321, the second water pipe 31 is provided with a second pressure sensor 311, the sewage discharge pipe 11 is provided with a first electromagnetic valve 111, and the switching control can be performed through a controller according to the detected pressure. For example, when the pressure detected by the first pressure sensor 321 or the second pressure sensor 311 exceeds a threshold value, the switching valve 30 is controlled to switch the output port. Then, the first electromagnetic valve 111 is controlled to be opened in a preset state within a preset time T after the switching of the switching valve 30.

Further, a second solenoid valve 233 is disposed at a lower end of the hollow inner membrane 221, such that the second chamber 201 is connected to the first chamber 101 through the second solenoid valve 233, and the second solenoid valve 233 is configured to be closed when the switching valve 30 is switched to the second output end, and to be opened or closed simultaneously with the first solenoid valve 111 when the switching valve 30 is switched to the first output end.

It should be understood that, in the embodiments of the present invention, the detecting devices such as the pressure sensor and the actuators such as the water pump and the solenoid valve are connected with the controller in an advantageous manner, so as to realize data and signal communication, and complete the transceiving of sensing data and the transmission of control instructions. As an alternative embodiment, the controller may adopt an industrial PLC controller, and is configured with a control box or a control cabinet, on which a display for representing information such as a pressure value, a raw water flow rate, and the like to an operator and a control panel for controlling actuators such as a pumping device, an electromagnetic valve, and the like are configured.

Referring to fig. 1, assuming that the raw water is previously circulated through the second filtering path, when the second pressure sensor 311 detects that the pressure exceeds the threshold value, which is indicative of the pressure being attached to the inner surface of the hollow inner membrane 221, the switching valve 30 switches the output port such that the raw water is switched from the second water pipe 31 to the first water pipe 32, that is, the raw water is circulated through the first filtering path. At this time, the second solenoid valve 233 is opened, the first solenoid valve 111 is opened, the pressure inside the hollow inner membrane 221 is small, the water passing through the hollow outer membrane 222 flows to the hollow inner membrane 221 after passing through the annular passage 223, and washes the inner surface of the hollow inner membrane 221, so that the attachments fall off to form the sewage, and the sewage is discharged from the sewage discharge pipe 11.

As shown in fig. 2, when the contaminated water is discharged for a certain time, the first and second solenoid valves 111 and 233 are closed, and the passage inside the hollow inner membrane 221 is blocked, so that the raw water filtered by the hollow outer membrane 222 can be discharged from the drain pipe 12 only along the annular passage 223.

As shown in fig. 3, as the filtering time of the hollow outer membrane 222 increases, the dirt adheres to the surface thereof, the filtering pressure increases, when the first pressure increases to a preset value, the switching valve 30 switches the output port, so that the raw water is switched from the first water pipe 32 to the second water pipe 31, that is, the raw water flows through the second filtering path, the raw water enters the second cavity 223 of each hollow inner membrane 221 from the water distribution pipe 21, meanwhile, the first electromagnetic valve 111 is opened, the water flowing through the hollow inner membrane 221 flows to the hollow outer membrane 222 after passing through the annular channel 223, and washes the outer surface of the hollow outer membrane 222, so that the attachments fall off, thereby forming the sewage, which is discharged from the sewage discharge pipe 11.

Referring to fig. 4, when the contaminated water is discharged for a certain time, the first solenoid valve 111 is closed, and the first chamber 101 is closed, so that the raw water is filtered by the hollow inner membrane 221 and discharged from the drain pipe 12 only along the annular passage 223.

In the above embodiment, the first solenoid valve 111 is controlled to be opened in a pulse state, so that the formed pulse water flow can better break off the dirt on the surface of the membrane structure.

In a preferred embodiment, the pressure thresholds of the first pressure sensor 321 and the second pressure sensor 311 may be preset at 1.5-2.0Mpa. In other embodiments, the adjustment can be made according to the designed raw water filtering environment.

In a specific embodiment, the membrane structures of the hollow outer membrane 222 and the hollow inner membrane 221 each include three layers, the pore diameter of the first membrane structure is 150-250um, the pore diameter of the second membrane structure is 100-150um, and the pore diameter of the third membrane structure is 20-50um.

Preferably, the pore density of the first membrane structure comprises a dense region and a sparse region, the ratio of the lengths of the dense region and the sparse region is 1.

Therefore, the thickness of attached dirt is not uniform through the dividing action of the dense-hole area and the sparse-hole area, the dirt is easy to drop in a blocking manner during backwashing, and the backwashing effect is improved.

[ filtration principle of raw Water ]

With the double-layer hollow black crystal fiber membrane filtration module of the above embodiment, the process of filtering raw water by using the module comprises the following steps:

step 1, inputting raw water with stable pressure into a water inlet pipeline, and filtering the raw water by a first cavity 101 or a second cavity 201 through a double-layer hollow fiber membrane, wherein the filtering path comprises a first filtering path and a second filtering path;

step 2, continuously monitoring pressure data detected by a first pressure sensor 321 and a second pressure sensor 311, switching the original filtering path of raw water when any one of the detected pressure data exceeds a threshold value, simultaneously opening a drainage pipeline 12, performing back flushing on the membrane structure, and discharging the raw water through the drainage pipeline 12 after the raw water is filtered by a double-layer hollow fiber membrane;

wherein, the first filtration path is the first cavity 101, the hollow outer membrane 222 and the annular channel 223, and the second filtration path is the second cavity 201, the hollow inner membrane 221 and the annular channel 223.

Example 1

Referring to fig. 1, assuming that the raw water is previously circulated through the second filtering path, when the second pressure sensor 311 detects that the pressure exceeds the threshold value, the internal surface of the hollow inner membrane 221 is characterized to be attached, the switching valve 30 switches the output port to switch the raw water from the second water pipe 31 to the first water pipe 32, that is, the raw water is circulated through the first filtering path, at this time, the second electromagnetic valve 233 is opened, the first electromagnetic valve 111 is opened, the pressure inside the hollow inner membrane 221 is low, the water flowing through the hollow outer membrane 222 flows to the hollow inner membrane 221 after passing through the annular channel 223, and flushes the internal surface of the hollow inner membrane 221 to cause attachments to fall off, so that the sewage is discharged from the sewage discharge pipe 11.

Referring to fig. 2, when the contaminated water is discharged for a certain time, the first and second solenoid valves 111 and 233 are closed, and the passage in the hollow inner membrane 221 is blocked, so that the raw water filtered through the hollow outer membrane 222 can be discharged from the drain pipe 12 only along the annular passage 223.

As shown in fig. 3, as the filtering time of the hollow outer membrane 222 increases, the surface of the hollow outer membrane is attached with dirt, the filtering pressure increases, when the first pressure increases to a preset value, the switching valve 30 switches the output port, so that the raw water is switched from the first water pipe 32 to the second water pipe 31, that is, the raw water circulates from the second filtering path, the raw water enters the second cavity 223 in each hollow inner membrane 221 from the water distribution pipe 21, meanwhile, the first electromagnetic valve 111 is opened, the water flowing through the hollow inner membrane 221 flows to the hollow outer membrane 222 after passing through the annular channel 223, and flushes the outer surface of the hollow outer membrane 222, so that the attached matter falls off, thereby forming sewage, and the sewage is discharged from the sewage discharge pipe 11.

As shown in fig. 4, when the contaminated water is discharged for a certain time, the first solenoid valve 111 is closed, and at this time, the first chamber 101 is closed, so that the raw water filtered by the hollow inner membrane 221 can be discharged from the drain pipe 12 only along the annular passage 223.

Preferably, when the raw water is filtered by the first filtering path, the second chamber 201 is communicated with the first chamber 101 when the sewage pipe 11 drains, and when the raw water is filtered by the second filtering path, the second chamber 201 is not communicated with the first chamber 101.

Specifically, the lower end of the hollow inner membrane 221 is provided with a second solenoid valve 233, so that the second chamber 201 is connected to the first chamber 101 through the second solenoid valve 233, and the second solenoid valve 233 is configured to be closed when the switching valve 30 is switched to the second output end, and to be opened or closed simultaneously with the first solenoid valve 111 when the switching valve 30 is switched to the first output end.

When the raw water is filtered by the first filtering path, the second solenoid valve 233 and the first solenoid valve 111 are simultaneously opened to communicate the second chamber 201, the first chamber 101 and the sewage pipe 11; when the raw water is filtered by the second filtering path, the second solenoid valve 233 is closed and the first solenoid valve 111 is opened, so that the first chamber 101 and the soil pipe 11 are communicated.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.

Claims (10)

1. A double-layer hollow black crystal fiber membrane filter component is characterized by comprising:

the filtering container (10) is provided with a sewage draining pipe (11) and a water inlet (322);

the fiber membrane module (20) is arranged in the filtering container (10), the fiber membrane module (20) comprises a plurality of double-layer hollow fiber membranes, and the first ends and the second ends of the double-layer hollow fiber membranes are connected with a water distribution disc (23);

the first end of the water inlet pipeline is connected to the water pump, the second end of the water inlet pipeline is connected to the input end of the switching valve (30), the first output end of the switching valve (30) is connected with the first water pipeline (32), and the second end of the switching valve (30) is connected with the second water pipeline (31);

a water discharge pipeline (12);

the double-layer hollow fiber membrane comprises a hollow inner membrane (221) and a hollow outer membrane (222), wherein the hollow outer membrane (222) is positioned on the outer side of the hollow outer membrane (222), an annular channel (223) is formed between the hollow inner membrane (221) and the hollow outer membrane (222), the outer wall of the hollow outer membrane (222) and the inner wall of the filtering container (10) form a first cavity (101), the interior of the hollow inner membrane (221) forms a second cavity (201), the annular channel (223) and the first cavity (101) are isolated through the hollow outer membrane (222), and the annular channel (223) and the second cavity (201) are isolated through the hollow inner membrane (221);

the first water pipe (32) is connected to a water inlet hole (322) to enable the first cavity (101) to be communicated with the first water pipe, the second water pipe (31) is connected to the water distribution disc (23) to enable the second water pipe (31) to be communicated with the second cavity (201);

the hollow outer membrane (222) is arranged such that the void density gradually decreases from the first cavity (101) to the annular channel (223);

the hollow inner membrane (221) is set to gradually reduce the void density from the second cavity (201) to the annular channel (223);

the first end of the drainage pipeline (12) is connected to the water distribution disc (23) so that the drainage pipeline (12) is communicated with the annular channel (223).

2. The double-layer hollow black crystal fiber membrane filter assembly according to claim 1, wherein the double-layer hollow black crystal fiber membrane filter assembly further comprises a controller, the first water pipeline (32) is provided with a first pressure sensor (321), the second water pipeline (31) is provided with a second pressure sensor (311), the drain pipe (11) is provided with a first electromagnetic valve (111), the controller is configured to control the switching valve (30) to switch the output port when the pressure detected by the first pressure sensor (321) or the second pressure sensor (311) exceeds a threshold value, and the first electromagnetic valve (111) is controlled to be opened according to a preset state within a time T after the switching valve (30) is switched.

3. The double-layer hollow black crystal fiber membrane filtration module according to claim 2, wherein the first solenoid valve (111) is controlled to be opened in a pulsed state.

4. The double-layered hollow black crystal fiber membrane filtration module according to claim 2, wherein the pressure threshold of the first pressure sensor (321) and the second pressure sensor (311) is 1.5-2.0Mpa.

5. The double-layer hollow black crystal fiber membrane filtration module according to claim 2, wherein the water distribution tray (23) above the double-layer hollow fiber membrane is provided with a water distribution pipe (21).

6. The double-layer hollow blackcrystal fiber membrane filter module according to claim 5, wherein a first end of the water distribution pipe (21) is connected to the second water pipeline (31), and a second end of the water distribution pipe (21) is connected to the first cavity (101).

7. The double-layer hollow black crystal fiber membrane filter module according to claim 5, wherein the water distribution tray (23) below the double-layer hollow fiber membrane is provided with a junction box (231), a first end of the junction box (231) is communicated with the annular channel (223), a second end of the junction box (231) is connected with a drainage pipeline (12), and the hollow inner membrane (221) penetrates through the junction box (231) and extends into the first cavity (101).

8. The double-layer hollow blackcrystal fiber membrane filter module according to claim 7, wherein a second solenoid valve (233) is provided at a lower end of the hollow inner membrane (221) such that the second chamber (201) is connected to the first chamber (101) through the second solenoid valve (233), and the second solenoid valve (233) is configured to be closed when the switching valve (30) is switched to the second output end and to be opened or closed simultaneously with the first solenoid valve (111) when the switching valve (30) is switched to the first output end.

9. The double-layer hollow black crystal fiber membrane filter assembly according to any one of claims 1 to 8, wherein the membrane structures of the hollow outer membrane (222) and the hollow inner membrane (221) comprise three layers, the pore size of the first layer membrane structure is 150-250um, the pore size of the second layer membrane structure is 100-150um, and the pore size of the third layer membrane structure is 20-50um.

10. The double-layer hollow black crystal fiber membrane filter module according to claim 9, wherein the pore size density of the first membrane structure comprises a dense-pore region and a sparse-pore region, the length ratio of the dense-pore region to the sparse-pore region is 1-5, and the dense-pore region and the sparse-pore region are alternately distributed in the longitudinal direction.

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