CN220779741U - External pressure type hollow fiber membrane assembly - Google Patents

Abstract

The utility model discloses an external pressure type hollow fiber membrane component, which comprises: the hollow fiber membrane bundle comprises a first encapsulating part, a second encapsulating part and a filtering part, wherein a plurality of hollow fiber membrane wires of the first encapsulating part are bonded with each other, the ports are closed, and a plurality of hollow fiber membrane wires of the second encapsulating part are bonded with each other, and the ports are open; the container comprises a containing cavity and a side wall, wherein the hollow fiber membrane bundle is arranged in the containing cavity, and a liquid inlet and a penetrating liquid inlet are formed at two ends of the side wall; the second filling and sealing part is arranged at the position corresponding to the permeate liquid port in the container in a sealing way, and the first filling and sealing part is arranged at the position corresponding to the liquid inlet in the container; the stabilizing part extends along the circumferential direction of the hollow fiber membrane bundle and at least surrounds the junction of the first encapsulating part and the filtering part so as to form limit fixation on the hollow fiber membrane bundle; a flow passage for communicating the liquid inlet with the accommodating cavity is formed between the stabilizing part and the side wall of the container; the utility model has the effects of reducing the shaking of the first encapsulating part, avoiding the blocking of the membrane hole and ensuring the filtering efficiency of the filtering part.

Description

External pressure type hollow fiber membrane assembly

Technical Field

The utility model belongs to the technical field of filter equipment, and particularly relates to an external pressure type hollow fiber membrane component.

Background

In the manufacture of electronic/electric parts such as semiconductors and display elements, a great amount of ultrapure water is required for cleaning and the like, so that there is a very severe demand for the quality of ultrapure water, whereas UF has a very strict quality standard in terms of filtration performance as a terminal filtration step before the point of use of ultrapure water.

The utility model discloses a composite membrane ultrafilter of CN2075537U, a water inlet is welded in bottom central point, an overflow port is welded at the shell lateral surface, concentrated raw water overflows from the overflow port, a polypropylene plastic flower plate is settled at the uppermost of shell, install a stainless steel top cap on the flower plate again, top cap and shell pass through flange fixed connection, the flower plate also can be fixed simultaneously, shell and top cap form cylindric pressure-resistant container, and the flower plate divide pressure-resistant container into former hydroecium and water purification room two parts, a filtration water outlet is welded at the top of top cap. A plurality of round holes are uniformly distributed on the surface of the pattern plate, threads are arranged on the side wall of the round holes, the plastic connector is fixedly connected with the pattern plate through threaded fit, and a polyvinyl alcohol film and a microporous tube formed by sintering polyethylene and activated carbon powder are fixedly connected below the plastic connector. The microporous tube plays a role of a support body, namely, the polyvinyl alcohol film is compounded on the microporous tube by a special process method and is supported by the microporous tube.

However, the microporous tube and the polyvinyl alcohol film cooperate to achieve a good filtering effect, the structure is relatively complex, the filtering effect is poor, the structure of omitting the microporous tube cannot form a supporting effect on the polyvinyl alcohol film, and when a large amount of supply liquid is supplied from the water inlet, the polyvinyl alcohol film is impacted, so that the polyvinyl alcohol film shakes or is damaged.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides an external pressure type hollow fiber membrane component, which surrounds and fixes a first encapsulating part through a stabilizing part, is beneficial to avoiding shaking of hollow fiber membrane wires near the first encapsulating part along with a large amount of water, and avoids damage or breakage of the root parts of the hollow fiber membrane wires under the impact of the large amount of water, and has a beneficial protective effect on the hollow fiber membrane wires.

The technical scheme adopted for solving the technical problems is as follows: an external pressure type hollow fiber membrane module comprising:

the hollow fiber membrane bundle consists of a plurality of hollow fiber membrane filaments, and comprises a first encapsulating part, a second encapsulating part and a filtering part, wherein the first encapsulating part and the second encapsulating part are oppositely arranged along the axial direction of the hollow fiber membrane bundle, the filtering part is positioned between the first encapsulating part and the second encapsulating part, the plurality of hollow fiber membrane filaments of the first encapsulating part are adhered and the ports of the hollow fiber membrane filaments are closed, and the plurality of hollow fiber membrane filaments of the second encapsulating part are adhered and the ports of the hollow fiber membrane filaments are open;

The container comprises a containing cavity and a side wall, the containing cavity extends along the axial direction of the hollow fiber membrane bundle, the side wall surrounds the containing cavity, the hollow fiber membrane bundle is arranged in the containing cavity, and a liquid inlet and a penetrating liquid outlet are respectively formed at two axial ends of the side wall corresponding to the hollow fiber membrane bundle;

the second filling and sealing part is arranged at a position corresponding to the permeate port in the container and forms a seal with the container, and the first filling and sealing part is arranged at a position corresponding to the permeate port in the container; the stabilizing part extends along the circumferential direction of the hollow fiber membrane bundle and at least surrounds the junction of the first encapsulating part and the filtering part so as to form limit fixation on at least part of the hollow fiber membrane bundle; and a flow channel is formed between the stabilizing part and the side wall of the container so as to be communicated with the liquid inlet and the accommodating cavity, so that the liquid passes through the liquid inlet, the flow channel, the accommodating cavity and the hollow fiber membrane wire inner cavity and flows out from the permeate liquid port.

According to the technical scheme, the hollow fiber membrane bundles are formed by bundling a plurality of hollow fiber membrane wires along the axial direction of the hollow fiber membrane bundles, wherein each hollow fiber membrane wire is hollow, ports at two ends of the hollow fiber membrane wires are open, a plurality of hollow fiber membrane wire filtering holes are formed in the side wall of the hollow fiber membrane wire, feed liquid is allowed to circulate between the outside of the hollow fiber membrane wire and the inner cavity of the hollow fiber membrane wire, and when feed liquid to be filtered, namely feed liquid, is required to be filtered through the hollow fiber membrane wire, the feed liquid enters the inner cavity of the hollow fiber membrane wire through the hollow fiber membrane wire filtering holes to form permeate liquid, and the permeate liquid flows out through the hollow fiber membrane wire ports to be blocked outside the hollow fiber membrane wire to form retentate; the first encapsulating part and the second encapsulating part are structures formed by encapsulating the end parts of the hollow fiber membrane wires with bonding materials and mutually bonding the hollow fiber membrane wires, the hollow fiber membrane wires which are not bonded by the bonding materials form a filtering part, the hollow fiber membrane wire ports of the first encapsulating part are closed, and the hollow fiber membrane wire ports of the second encapsulating part are open: when the feed liquid enters the container from the liquid inlet, the feed liquid is subjected to an external pressure type filtering mode through the hollow fiber membrane wires of the filtering part, namely, the feed liquid sequentially passes through the hollow fiber membrane wire filtering holes and enters the inner cavity of the hollow fiber membrane wires to form penetrating liquid, the penetrating liquid flows out through the hollow fiber membrane wire port and the penetrating liquid port of the second encapsulating part, the residual liquid is blocked outside the hollow fiber membrane wires, and the residual liquid is retained in the container or flows out through other openings on the side wall of the container; the stabilizing part at least surrounds the junction of the first encapsulating part and the filtering part, that is to say, the stabilizing part at least surrounds one end of the first encapsulating part close to the filtering part, and the stabilizing part forms limit fixation on the hollow fiber membrane bundles, so that when a large amount of supply liquid enters from the liquid inlet, the first encapsulating part is surrounded and fixed by the stabilizing part, thereby being beneficial to reducing the shaking of the hollow fiber membrane bundles near the first encapsulating part along with the impact of a large amount of water, further avoiding shaking of the first encapsulating part to drive the whole hollow fiber membrane bundles, avoiding the change of the interval between adjacent hollow fiber membrane filaments, and even the blocking of the hollow fiber membrane filament filtering holes caused by the close fit between the membrane filaments, and further ensuring the effective filtering area and good filtering efficiency of the filtering part; the shaking of the hollow fiber membrane wires is reduced, so that the damage caused by collision between adjacent membrane wires is avoided, and the service life of the hollow fiber membrane bundles is prolonged; simultaneously firm portion can not cover all filter parts, guarantees that liquid can effectively get into the filter part between first embedment portion and the second embedment portion, guarantees then that liquid can make full use of filter part realization filtration to guarantee efficient filtration efficiency.

Further, the filter part comprises an extension part close to the first encapsulating part, and the stabilizing part extends along the axial direction of the hollow fiber membrane bundle towards the direction away from the liquid inlet and at least covers the extension part to form a fiber protection section.

According to the technical scheme, the first encapsulating part is formed by solidifying the encapsulating material and has certain rigidity, so that the root part of the hollow fiber membrane wire close to the first tube encapsulating part and the contact junction of the rigid first encapsulating part are easy to break, and the fiber protection section is arranged, namely, the stabilizing part surrounds the junction of the first encapsulating part and the filtering part and also surrounds a part of the filtering part, particularly a part connected with the first encapsulating part, of the stabilizing part, the axial extension length of the stabilizing part towards the direction of the permeate port is increased, namely, the axial extension length of the filtering part is wrapped by the stabilizing part, the axial limit fixing area of the hollow fiber membrane wire is increased on the basis of limiting and fixing the junction of the first encapsulating part and the filtering part, the limit fixing effect of the hollow fiber membrane wire is further stabilized, the hollow fiber membrane wire near the first encapsulating part is protected by the stabilizing part, and the hollow fiber membrane wire cannot shake greatly when the feed liquid enters from the feed port in a large amount, and the hollow fiber membrane wire is prevented from being damaged or broken due to the impact of the large amount of water near the root part of the first encapsulating part.

Further, the flow passage includes a gap formed between the fixing portion and the container side wall, and an inner diameter of the gap is larger than an inner diameter of the accommodating chamber, and a communication passage formed between the gap and the accommodating chamber, through which the feed liquid flows.

Through the technical scheme, a gap is formed between the stabilizing part and the side wall of the container, feed liquid entering through the liquid inlet enters the containing cavity through the communication channel, so that the feed liquid entering the peripheral parts of the containing cavity is relatively balanced, the excessive filtering pressure of the local area of the filtering part is avoided, and a good filtering effect is ensured; because the pressure that a large amount of feed liquid formed can cause the damage to the hollow fiber membrane bundle, the internal diameter of clearance is greater than the internal diameter that holds the chamber simultaneously to it can be temporarily stored a large amount of feed liquids, also forms cushioning effect to a large amount of feed liquids, avoids the feed liquid pressure too big to lead to the impact to firm portion too big, guarantees that first embedment portion can not produce and rocks by a wide margin, and then avoids hollow fiber membrane silk to rock or hug closely, guarantees hollow fiber membrane silk effectual filtration area and good filtration efficiency.

Further, a through hole is formed in the position, corresponding to the gap, of the stabilizing portion so as to communicate the gap with the filtering portion.

By adopting the technical scheme, part of the feed liquid in the gap enters the accommodating cavity through the channel, and the other part of the feed liquid can directly enter the filtering part through the through hole, so that the feed liquid in the gap can be timely dispersed into the filtering part, the water pressure in the gap can be timely reduced, the shaking of the hollow fiber membrane bundle caused by overlarge water pressure at the position is avoided, the effective filtering area of the filtering part is increased, the effective utilization rate of the filtering part is increased, and the filtering efficiency is improved.

Further, the axial length of the stabilizing part is L1, and the axial length of the hollow fiber membrane bundle is L, and then L1/L is 0.1-0.3.

By adopting the technical scheme, if the ratio of the axial length of the stabilizing part to the axial length of the hollow fiber membrane bundle exceeds 0.3, the area of the stabilizing part is larger, the stabilizing part has good fixing effect on the hollow fiber membrane bundle, but the shielding area of the stabilizing part on the filtering part is too large, so that the effective filtering area of the filtering part is reduced, the filtering efficiency is reduced, and the supply liquid entering from the liquid inlet is difficult to disperse in time, so that the pressure is too large at the position to cause shaking of the hollow fiber membrane bundle; if the ratio of the axial length of the stabilizing portion to the hollow fiber membrane bundle is less than 0.1, the area of the stabilizing portion is small, the stabilizing portion cannot form a good fixing effect on the hollow fiber membrane bundle, and the hollow fiber membrane bundle may shake to cause damage; therefore, the axial length of the stabilizing part and the axial length of the hollow fiber membrane bundle are in the range of the ratio, so that the better filtering efficiency can be considered, and the stabilizing and limiting effects of the stabilizing part on the hollow fiber membrane bundle can be achieved; meanwhile, the axial lengths of the communication channels and the gaps are in a proper range, and the situation that the feed liquid is transferred to the accommodating cavity slowly due to overlong communication channels is avoided.

Further, a connecting part is arranged between the stabilizing part and the container and comprises a mounting position arranged on the stabilizing part and a matching position arranged on the container, and the mounting position and the matching position are in plug-in matching.

By adopting the technical scheme, the mounting position and the matching position are in plug-in matching, so that an interpenetrating structure is formed between the mounting position and the matching position, the firmness of the stable part mounted on the container is improved, and the impact resistance of the stable part is improved; the position of connecting portion can also be in the middle part of firm portion at the both ends of firm portion, and when connecting portion was fixed in firm portion middle part, the assembly stability of firm portion was high, improved the fixed effect of cavity fiber membrane bundle, improved shock-resistant effect, avoided cavity fiber membrane bundle vibration.

Further, the mounting position is a convex insertion part formed by extending along the radial direction from the outer wall of the stabilizing part, and the communication channel is formed between adjacent convex insertion parts; the container comprises a hollow tube extending along the axial direction of the hollow fiber membrane bundle and a packaging tube connected to two ends of the hollow tube, the containing cavity is formed in the hollow tube, and the matching position is a groove formed by axially connecting the packaging tube and the hollow tube.

By adopting the technical scheme, the mounting position is in a convex-concave shape, the matching position is in a groove shape, and the structure is simple through concave-convex matching; the groove is formed by connecting the wall of the packaging tube with the wall of the hollow tube, and the groove can be arranged on the wall of the hollow tube or the wall of the packaging tube, so that the assembly process between the inserting protrusion and the groove is simple and firm, the inserting protrusion can be firstly placed into the groove in the assembly process, and then the hollow tube or the packaging tube is pressed and arranged on the inserting protrusion, so that the inserting protrusion is embedded into the groove, the firmness of connecting the stabilizing part on the container is improved, and the impact resistance of the stabilizing part is improved; in addition, the communication channel is formed between adjacent inserting convex parts, so that the circumferential width of the inserting convex parts is reduced, and the embedding process between the inserting convex parts and the grooves is facilitated; and the communication channel does not need an additional setting process, so that the forming mode is simple.

Further, the inner surface of the axial connection part of the hollow tube and the packaging tube is flush.

By adopting the technical scheme, the inner surface of the axial connection part of the hollow pipe and the packaging pipe is flush, and relative to non-uniform planes such as a bent corner and the like, turbulence can be reduced, the shearing force of the material liquid which is not tolerant to shearing is reduced, meanwhile, the accumulated liquid is promoted to be quickly flushed away, and dead angles caused by accumulation of the material liquid are avoided.

Further, a radial fixed connection surface and/or an axial fixed connection surface are arranged between the packaging pipe and the hollow pipe; and a fixed connection surface is arranged at the contact position of the inserting convex and the groove.

The radial fixed connecting surface, the axial fixed connecting surface and the fixed connecting surface can be welded, bonded or any surface which is mutually connected by the prior art, and the radial fixed connecting surface and the axial fixed connecting surface improve the strength of the connecting part between the hollow tube and the packaging tube and avoid the axial separation or the radial separation of the hollow tube and the packaging tube; the fixed connection face improves the connection strength between the inserting convex and the groove, also improves the connection strength of the connection part between the hollow pipe and the packaging pipe, and simultaneously can also prevent displacement of the hollow pipe and the packaging pipe in the packaging process.

Further, the stabilizing portion comprises a starting end close to the liquid inlet and a tail end far away from the liquid inlet, the inserting protrusion is formed by bending the tail end of the stabilizing portion radially outwards, and the bending part is in arc transition.

When inserting protruding in the tip of stabilizing portion, make things convenient for the assembly between stabilizing portion and the container, insert protruding from the radial outwards processing of buckling of stabilizing portion end, the formation at dead angle can be reduced in the arc transition of buckling department, guarantees as much as possible feed liquid flow direction intercommunication passageway.

Further, the device also comprises a stabilizing part which extends along the circumferential direction of the hollow fiber membrane bundle and at least surrounds the junction of the second encapsulating part and the filtering part so as to form limit fixation on at least part of the hollow fiber membrane bundle; the side wall of the container is provided with a retentate inlet, and the stabilizing part comprises a shielding area, and the shielding area covers the retentate inlet along the projection perpendicular to the axial direction of the hollow fiber membrane bundle.

According to the technical scheme, the stabilizing part is arranged at the juncture of the second encapsulating part and the filtering part of the hollow fiber membrane bundle, and the hollow fiber membrane bundle is limited and fixed, so that when a large amount of permeate liquid is discharged from the permeate liquid port, the second encapsulating part is surrounded and fixed by the stabilizing part, so that the shaking of the hollow fiber membrane bundle along with a large amount of permeate liquid near the second encapsulating part is reduced, the shaking of the second encapsulating part is avoided, the shaking of the whole hollow fiber membrane bundle is driven, the change of the interval between adjacent hollow fiber membrane wires is avoided, even the close contact between the membrane wires is avoided, the blocking of the hollow fiber membrane wire filtering holes is further caused, and the effective filtering area and the good filtering efficiency of the filtering part are ensured; the shaking of the hollow fiber membrane wires is reduced, so that the damage caused by collision between adjacent membrane wires is avoided, and the service life of the hollow fiber membrane bundles is prolonged; meanwhile, the stabilizing part does not cover all the filtering parts, so that the liquid can be filtered by fully utilizing the filtering parts, and the high-efficiency filtering efficiency is ensured; when the liquid is discharged from the liquid outlet, the hollow fiber membrane wires are extruded to bend towards the liquid outlet, the hollow fiber membrane wires are broken off by the ports, which are close to the hollow fiber membrane wires, of the liquid outlet, and the shielding area is arranged to shield the hollow fiber membrane wires near the liquid outlet when the liquid is used for bending the hollow fiber membrane wires towards the liquid outlet, so that the hollow fiber membrane wires are prevented from being broken when the liquid is discharged from the liquid outlet through the liquid outlet.

Further, the stabilizing portion further comprises a liquid exchange area, and the liquid exchange area is provided with a through hole so as to be communicated with the accommodating cavity and the filtering portion.

By adopting the technical scheme, the supply liquid of the accommodating cavity can directly enter the filtering part corresponding to the area where the stabilizing part is located through the through hole, so that the filtering speed is improved, the supply liquid is timely dispersed into the filtering part, the water pressure at the position where the stabilizing part is located is timely reduced, shaking of the hollow fiber membrane bundle caused by overlarge water pressure is avoided, the effective filtering area of the filtering part is increased, the effective utilization rate of the filtering part is increased, and the filtering efficiency is improved.

The beneficial effects of the utility model are as follows:

1) The stabilizing part is arranged at the juncture of the first encapsulating part and the filtering part of the hollow fiber membrane bundle, and the hollow fiber membrane bundle is limited and fixed, so that when a large amount of supply liquid enters from the liquid inlet, the first encapsulating part is surrounded and fixed by the stabilizing part, thereby being beneficial to reducing the shaking of the hollow fiber membrane bundle near the first encapsulating part along with the impact of a large amount of water, further avoiding the shaking of the first encapsulating part to drive the whole hollow fiber membrane bundle to shake, avoiding the change of the interval between adjacent hollow fiber membrane wires and even the plugging of the hollow fiber membrane wire filtering holes caused by the close fit between the membrane wires, and further ensuring the effective filtering area of the filtering part and good filtering efficiency; the shaking of the hollow fiber membrane wires is reduced, so that the damage caused by collision between adjacent membrane wires is avoided, and the service life of the hollow fiber membrane bundles is prolonged; meanwhile, the stable part can not cover all the filtering parts, so that liquid can effectively enter the filtering parts between the first encapsulating part and the second encapsulating part, and then the filtering parts can be fully utilized for filtering, so that the efficient filtering efficiency is ensured;

2) The technical scheme that the fiber protection section is formed by extending and covering the extending part by adopting the stabilizing part is adopted, the stabilizing part surrounds the junction of the first encapsulating part and the filtering part, and also surrounds a part of the filtering part connected with the first encapsulating part, so that the axial extending length of the stabilizing part in the direction of the permeate port is increased, namely, the axial length of the filtering part is wrapped by the stabilizing part as much as possible, the axial limiting and fixing area of the hollow fiber membrane bundles is increased on the basis that the limiting and fixing area is formed at the junction of the first encapsulating part and the filtering part by the stabilizing part, and the limiting and fixing effect of the hollow fiber membrane bundles is further stabilized, so that hollow fiber membrane wires near the first encapsulating part are protected by the stabilizing part, and the hollow fiber membrane wires do not shake greatly when the feed liquid enters from the feed liquid port in a large amount, and the root of the hollow fiber membrane wires close to the first encapsulating part are prevented from being damaged or broken under the impact of a large amount of water;

3) By adopting the technical scheme that the flow channel comprises a gap and a communication channel, a gap is formed between the stabilizing part and the side wall of the container, and feed liquid entering through the liquid inlet enters the accommodating cavity through the communication channel, so that the feed liquid entering the circumferential direction of the accommodating cavity is relatively balanced, the excessive filtering pressure of a local area of the filtering part is avoided, and a good filtering effect is ensured; because the pressure that a large amount of feed liquid formed can cause the damage to the hollow fiber membrane bundle, the internal diameter through the clearance is greater than the internal diameter that holds the chamber to it can be temporarily stored a large amount of feed liquids, also forms cushioning effect to a large amount of feed liquids, avoids the feed liquid pressure too big to lead to the impact to firm portion too big, guarantees that first embedment portion can not produce and rocks by a wide margin, and then avoids hollow fiber membrane silk to rock or hug closely, guarantees hollow fiber membrane silk effectual filtration area and good filtration efficiency.

Drawings

Fig. 1 is a perspective view of an external pressure type hollow fiber membrane module according to an embodiment of the present utility model.

Fig. 2 is a plan sectional view of an external pressure type hollow fiber membrane module according to an embodiment of the present utility model.

Fig. 3 is a perspective cross-sectional view of an external pressure type hollow fiber membrane module according to a first embodiment of the present utility model.

Fig. 4 is an enlarged view of the structure at a in fig. 3.

Fig. 5 is a perspective view of a fixing portion according to an embodiment of the utility model.

Fig. 6 is a perspective sectional view of a hollow fiber membrane module according to a first embodiment of the present utility model.

Fig. 7 is an enlarged view of the structure at C in fig. 6.

Fig. 8 is a perspective cross-sectional view of an external pressure type hollow fiber membrane module according to an embodiment of the present utility model, in which the fixing portion is not shown.

Fig. 9 is an enlarged view of the structure at E in fig. 8.

Fig. 10 is an enlarged view of the structure at B in fig. 3.

Fig. 11 is an enlarged view of the structure at D in fig. 6.

Fig. 12 is an enlarged view of the structure at F in fig. 8.

Fig. 13 is a perspective view of a stabilizing portion according to a first embodiment of the present utility model.

Fig. 14 is a second perspective view of the stabilizing portion according to the first embodiment of the present utility model.

Fig. 15 is a plan sectional view of an external pressure type hollow fiber membrane module according to a second embodiment of the present utility model, in which a stabilizing portion extends in an axial direction of a hollow fiber membrane bundle and covers a filtering portion.

Fig. 16 is a plan sectional view of an external pressure type hollow fiber membrane module according to a second embodiment of the present utility model, wherein the stabilizing portion extends along the axial direction of the hollow fiber membrane bundle and covers 1/2 of the axial length of the filtering portion.

The device comprises a 1-hollow fiber membrane bundle, a 11-first encapsulating part, a 12-second encapsulating part, a 13-filtering part, a 131-extending part, a 2-container, a 21-containing cavity, a 22-side wall, a 23-liquid inlet, a 24-permeate inlet, a 25-hollow tube, a 26-packaging tube, a 261-step structure, a 271-radial fixed connection surface, a 272-axial fixed connection surface, a 273-fixed connection surface, a 28-retentate inlet, a 3-stabilizing part, a 31-through hole, a 32-connecting part, a 321-inserting protrusion, a 322-groove, a 33-stabilizing part initial end, a 34-stabilizing part end, a 35-fiber protecting section, a 4-runner, a 5-gap, a 51-communicating channel, a 6-stabilizing part, a 61-shielding region, a 62-liquid exchanging region and a 621-through hole.

Detailed Description

In order to make the present utility model better understood by those skilled in the art, the following description of the technical solutions of the present utility model will be made in detail, but not all embodiments of the present utility model are apparent to some embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

Example 1

As shown in fig. 1 to 4, an external pressure type hollow fiber membrane module includes a hollow fiber membrane bundle 1 and a vessel 2. The hollow fiber membrane bundle 1 is formed by bundling a plurality of hollow fiber membrane filaments along the axial direction thereof, wherein each hollow fiber membrane filament is hollow, two ends of each hollow fiber membrane filament are provided with ports and the ports are open, the side wall of each hollow fiber membrane filament is provided with a plurality of hollow fiber membrane filament filter holes, feed liquid is allowed to circulate between the outside of the hollow fiber membrane filament and the inner cavity of the hollow fiber membrane filament, and when the feed liquid to be filtered, namely, the feed liquid, is required to be filtered through the hollow fiber membrane filament, the feed liquid enters the inner cavity of the hollow fiber membrane filament to form a penetrating fluid through the hollow fiber membrane filament filter holes and flows out through the hollow fiber membrane filament ports to be blocked outside the hollow fiber membrane filament to form a penetrating fluid. The hollow fiber membrane bundle 1 includes a first potting portion 11, a second potting portion 12, and a filter portion 13 located between the first potting portion 11 and the second potting portion 12, which are disposed opposite to each other in the axial direction of the hollow fiber membrane bundle 1, that is, the first potting portion 11, the filter portion 13, and the second potting portion 12 are disposed in this order from bottom to top, taking the direction shown in fig. 2 as an example; the plurality of hollow fiber membrane wires of the first encapsulating part 11 are bonded, namely, the first encapsulating part 11 is a structure formed by encapsulating the end parts of the hollow fiber membrane wires with bonding materials and bonding the hollow fiber membrane wires with each other, and the ports of the hollow fiber membrane wires are closed, namely, the ports of the hollow fiber membrane wires of the first encapsulating part 11 cannot be filled with liquid, and the ports can be blocked by the bonding materials or can be formed by using the bending points of the same hollow fiber membrane wires as the ports; the hollow fiber membrane filaments of the second potting portion 12 are bonded, that is, the second potting portion 12 is also a structure formed by potting the end portions of the hollow fiber membrane filaments with a bonding material and bonding the hollow fiber membrane filaments to each other, and the ports of the hollow fiber membrane filaments are opened, so that the permeate liquid in the inner cavity of the hollow fiber membrane filaments flows out from the ports. The filter unit 13 is formed of hollow fiber membrane filaments not bonded by a bonding material, and hollow fiber membrane filaments of the filter unit 13 have open filter pores to allow a supply liquid to flow from outside the hollow fiber membrane filaments to the inner cavities of the hollow fiber membrane filaments.

The container 2 comprises a containing cavity 21 extending along the axial direction of the hollow fiber membrane bundle 1 and a side wall 22 arranged around the containing cavity 21, the hollow fiber membrane bundle 1 is arranged in the containing cavity 21, the side wall 22 is respectively provided with a liquid inlet 23 and a permeate inlet 24 corresponding to the two axial ends of the hollow fiber membrane bundle 1, namely, in the embodiment, the liquid inlet 23 and the permeate inlet 24 are respectively arranged at the two ends of the container 2, liquid to be supplied enters the containing cavity 21 from the liquid inlet 23, and permeate is discharged from the containing cavity 21 from the permeate inlet 24. Of course, in other embodiments, the inlet 23 and permeate 24 may not be provided at the end of the vessel 2.

The second sealing part 12 is arranged in the container 2 at the position corresponding to the permeate port 24 and forms a seal with the container 2, so that liquid which is not filtered is prevented from leaking out of a gap between the second sealing part 12 and the container 2, and the filtering effect is poor. The first sealing part 11 is arranged at the position of the container 2 corresponding to the liquid inlet 23, and a stabilizing part 3 is arranged between the first sealing part 11 and the container 2. The stabilizing part 3 extends along the circumferential direction of the hollow fiber membrane bundle 1 and at least surrounds the junction of the first potting part 11 and the filtering part 13, so that at least part of the hollow fiber membrane bundle 1 is formed to be limited and fixed, and a flow passage 4 is formed between the stabilizing part 3 and the side wall 22 of the container 2, and the flow passage 4 is used for communicating the liquid inlet 23 with the accommodating cavity 21, so that the feed liquid forms permeate after passing through the liquid inlet 23, the flow passage 4, the accommodating cavity 21 and the hollow fiber membrane filament inner cavity, and the permeate flows out from the permeate port 24, and the retentate remains in the container 2 or flows out through other openings on the container 2.

The filtering process comprises the following steps: the feed liquid enters the container 2 from the liquid inlet 23, and then passes through the hollow fiber membrane wires of the filtering part 13 to perform an external pressure type filtering mode, namely, the feed liquid passes through the hollow fiber membrane wire filtering holes and enters the inner cavity of the hollow fiber membrane wires to form the permeate, and then flows out through the hollow fiber membrane wire ports and the permeate ports 24 of the second potting part 12, while the retentate is blocked outside the hollow fiber membrane wires and stays in the container 2 or flows out through other openings on the side wall 22 of the container.

At least part of the first encapsulating part 11, or rather at least the junction of the first encapsulating part 11 and the filtering part 13, is limited and fixed by the stabilizing part 3, that is to say, the stabilizing part 3 surrounds at least one end of the first encapsulating part 11 close to the filtering part 13, so that when a large amount of supply liquid enters from the liquid inlet 23, the first encapsulating part 11 is surrounded and fixed by the stabilizing part 3, thereby being beneficial to reducing the shaking of the hollow fiber membrane bundles 1 near the first encapsulating part 11 along with the impact of a large amount of water, further avoiding shaking of the first encapsulating part 11 to drive the whole hollow fiber membrane bundles 1, avoiding the blocking of the hollow fiber membrane wire filtering holes caused by the change of the interval between adjacent hollow fiber membrane wires and even the close contact between the membrane wires, and further ensuring the effective filtering area and good filtering efficiency of the filtering part 13; the shaking of the hollow fiber membrane bundles 1 is reduced, damage caused by collision between adjacent membrane wires is avoided, and the service life of the hollow fiber membrane bundles 1 is prolonged; simultaneously firm portion 3 can not cover whole filter part 13, guarantees that liquid can effectively get into filter part 13 between first embedment portion 11 and the second embedment portion 12, guarantees then that liquid can make full use of filter part 13 realize filtering, guarantees high-efficient filtration efficiency.

In order to further stabilize the limiting fixation of the hollow fiber membrane bundle 1, it is ensured that the hollow fiber membrane filaments do not shake substantially when the feed liquid is fed in a large amount from the liquid inlet 23, as shown in fig. 4, the filter portion 13 includes an extension portion 131 close to the first potting portion 11, the stabilizing portion 3 includes a start end 33 close to the liquid inlet 23 and a distal end 34 away from the liquid inlet 23, and the distal end 34 of the stabilizing portion 3 extends in a direction in which the hollow fiber membrane bundle 1 tends to be away from the liquid inlet 23 in the axial direction and covers at least the extension portion 131, thereby forming a fiber protecting section 35. That is, the fixing portion 3 forms a spacing fixing base on the junction of the first potting portion 11 and the filtering portion 13, and an axial spacing fixing area of the hollow fiber membrane bundle 1 is increased, the root of the filtering portion 13 can be protected while the first potting portion 11 is fixed, and the spacing fixing effect on the hollow fiber membrane bundle 1 is further stabilized, so that the hollow fiber membrane wires near the first potting portion 11 are protected by the fixing portion 3, and when the supply liquid enters from the liquid inlet 23 in a large amount, the hollow fiber membrane bundle 1 does not shake greatly, thereby being beneficial to avoiding damage or breakage of the extending portion 131 (that is, the root of the hollow fiber membrane wires of the filtering portion 13) under the impact of a large amount of water.

In this embodiment, the stabilizing portion 3 is hollow and cylindrical, and the end 34 of the stabilizing portion 3 forms a fiber protection section 35 for circumferentially surrounding the extending portion 131 to protect the extending portion 131 (i.e. the root of the hollow fiber membrane filament).

Wherein the flow passage 4 includes a gap 5 formed between the stabilizing portion 3 and the side wall of the container 2 and a communication passage 51 formed between the gap 5 and the inner cavity accommodating chamber 21, and the supply liquid is circulated. When a large amount of feed liquid enters from the liquid inlet 23, filtration cannot be realized through the hollow fiber membrane wire filtration holes in a short time, so that the pressure formed by the large amount of feed liquid can impact the hollow fiber membrane bundles 1, and the hollow fiber membrane bundles 1 shake to cause collision damage of the hollow fiber membrane wires; therefore, the inner diameter of the gap 5 is larger than that of the inner cavity accommodating cavity 21, the gap 5 can temporarily store a large amount of supply liquid, and a buffer effect is formed on a large amount of supply liquid, so that the excessive impact on the stabilizing part 3 caused by excessive supply liquid pressure is avoided, the first encapsulating part 11 is ensured not to shake greatly, the hollow fiber membrane wires are prevented from shaking or clinging, and the effective filtering area and the good filtering efficiency of the hollow fiber membrane wires are ensured.

As shown in fig. 5, a through hole 31 is further formed in a portion of the outer wall of the fixing portion 3 corresponding to the extension portion 131, or a through hole 31 is opened in a portion of the fixing portion 3 corresponding to the gap 5, and the through hole 31 is used for communicating the gap 5 with the filtering portion 13; the through holes 31 are opened so that a part of the feed liquid sequentially passes through the liquid inlet 23, the gap 5, the through holes 31 and the hollow fiber membrane filament lumens, and flows out from the permeate port 24, and the other part of the feed liquid sequentially passes through the liquid inlet 23, the gap 5, the flow passage 4, the accommodating chamber 21 and the hollow fiber membrane filament lumens, and flows out from the permeate port 24.

In other words, a part of the feed liquid in the gap 5 enters the hollow fiber membrane wire filter holes through the through holes 31, and a part of the feed liquid further enters the large-capacity accommodating chamber 21 through the channels 51, and then enters the hollow fiber membrane wire filter holes, which is advantageous in promoting the feed liquid in the container 2 to be rapidly filtered and dispersed in a short time, reducing the pressure formed by the existence of a large amount of the feed liquid in the container 2 to squeeze the hollow fiber membrane bundles 1, thereby protecting the hollow fiber membrane bundles 1 near the first potting portion 11 from the pressure formed by the existence of a large amount of the feed liquid in the container 2 in a short time to squeeze the hollow fiber membrane bundles 1, and thus causing the hollow fiber membrane wires to collide with each other and be damaged.

When the stabilizing portion 3 only surrounds the junction of the first potting portion 11 and the filtering portion 13, the supply liquid sequentially passes through the liquid inlet 23, the flow channel 4, the accommodating chamber 21 and the hollow fiber membrane filament inner cavity, and flows out from the permeate port 24, and the through hole 31 is not necessarily provided in the stabilizing portion 3.

As shown in fig. 2, the axial length of the stabilizing portion 3 is L1, and the axial length of the hollow fiber membrane bundle 1 is L, and L1/L is 0.1 to 0.3. If the ratio of the axial length of the stabilizing part 3 to the axial length of the hollow fiber membrane bundle 1 exceeds 0.3, the area of the stabilizing part 3 is larger, the fixing effect of the stabilizing part 3 on the hollow fiber membrane bundle 1 is good, but the shielding area of the stabilizing part 3 on the filtering part 13 is too large, so that the effective filtering area of the filtering part 13 is reduced, the filtering efficiency is reduced, and the feed liquid entering from the liquid inlet 23 is difficult to disperse in time, and the filtering efficiency is also reduced; if the ratio of the axial length of the stabilizing portion 3 to the hollow fiber membrane bundle 1 is less than 0.1, the area of the stabilizing portion 3 is small, the stabilizing portion 3 cannot form a good fixing effect on the hollow fiber membrane bundle 1, and the hollow fiber membrane bundle 1 may shake to cause damage; the ratio range is small, so that not only can the better filtering efficiency be considered, but also the effect of stable limit of the hollow fiber membrane bundle 1 can be achieved. The axial lengths of the stabilizing portion 3 and the hollow fiber membrane bundle 1 are in the above ratio range, so that the axial lengths of the communication channel 51 and the gap 5 are in a proper range, and the slow transfer of the feed liquid to the accommodating cavity 21 due to the overlong communication channel 51 is avoided.

As shown in fig. 5 to 9, in order to further increase the firmness and stability of the connection between the stabilizing portion 3 and the container 2, a connecting portion 32 is provided between the stabilizing portion 3 and the container 2, and the connecting portion 32 includes a mounting position provided on the stabilizing portion 3 and a mating position provided on the container 2, and the mounting position and the mating position are in plug-in mating, so as to achieve a fixed assembly between the stabilizing portion 3 and the container 2.

The installation position is inserted protruding 321 that extends along radial extension from the outer wall of stabilizing part 3, in this embodiment, six inserted protruding 321 have been laid along circumference interval to the end 34 of stabilizing part 3, form foretell communication channel 51 between the adjacent inserted protruding 321, and inserted protruding 321 radially outwards buckles from the end 34 of stabilizing part 3 and forms, and the department of buckling circular arc transition to reduce the formation at dead angle, guarantee as much as possible feed liquid flow direction communication channel 51. When the insert protrusion 321 is at the end of the stabilizing portion 3, the assembly between the stabilizing portion 3 and the container 2 is facilitated.

The container 2 comprises a hollow tube 25 extending axially along the bundle 1 of hollow fiber membranes, and a packing tube 26 connected to both ends of the hollow tube 25, and the receiving chamber 21 is formed in the hollow tube 25, and the fitting position is a groove 322 formed by axially connecting the packing tube 26 and the hollow tube 25. The installation position and the matching position are in plug-in matching, so that an interpenetrating structure is formed between the installation position and the matching position, the firmness of the connecting part is improved, and the impact resistance of the stable part 3 is improved.

Specifically, as shown in fig. 9, an annular step structure 261 is formed on the inner wall of the packaging tube 26, which is formed by the inner wall of the packaging tube 26 protruding toward the axis, a groove is formed at the position of the step structure 261 corresponding to the insertion protrusion 321, the longitudinal section of the groove is L-shaped to facilitate the insertion and fitting of the insertion protrusion 321, and a groove 322 is formed when the hollow tube 25 is connected with the packaging tube 26 along the axial direction thereof. When the hollow tube 25 is assembled and connected with the packaging tube 26 and the stabilizing part 3, the stabilizing part 3 is firstly inserted from top to bottom from the upper side of the packaging tube 26, the inserting convex 321 of the stabilizing part 3 is correspondingly placed in the forming groove, the thickness of the inserting convex 321 is matched with the axial depth of the forming groove, and the radial width of one side of the inserting convex 321 is larger than the radial depth of the forming groove, so that a gap exists between the outer wall of the stabilizing part 3 and the inner side wall of the stepped structure 261, and the gap forms a communication channel 51; the end of the hollow tube 25 is inserted into the packaging tube 26, and the end face of the hollow tube 25 is abutted against the end face of the stepped structure 261, so that the upper side opening of the profile groove is closed to form a groove 322, the insertion protrusion 321 is axially limited in the groove 322, the fixed assembly between the stabilizing portion 3 and the container 2 is realized, the structure is simple through concave-convex matching, the assembly structure is stable, and the impact resistance of the stabilizing portion 3 is improved. Of course, in other embodiments, the groove 322 may be provided on the hollow tube 25, which is not particularly limited.

In order to form a firm connection between the hollow tube 25, the securing part 3 and the packing tube 26 after the assembly is completed, there is a radial fixing connection surface 271 between the packing tube 26 and the hollow tube 25, or there is an axial fixing connection surface 272, or there is a radial fixing connection surface 271 and an axial fixing connection surface 272. In this embodiment, as shown in fig. 7 and 9, the end surface of the hollow tube 25 near the liquid inlet 23 is a radial fixed connection surface 271, and the end surface of the stepped structure 261 is also a radial fixed connection surface 271, where the two radial fixed connection surfaces may be welded, bonded or any one of the surfaces that are connected to each other by the prior art. The sealing tube 26 is partially wrapped around the outer periphery of the end of the hollow tube 25, and the joint surface between the outer wall of the hollow tube 25 and the inner wall of the sealing tube 26 is an axial fixing connection surface 272, where the two axial fixing connection surfaces may be welded, bonded or any surface that is connected with each other by the prior art. The radial and axial fixing connection surfaces 271 and 272 each increase the strength of the connection between the hollow tube 25 and the packing tube 26.

The connection manner between the insertion projection 321 and the groove 322 includes: the insert protrusion 321 may be disposed in the recess 322, or a fixed connection surface 273 may be disposed at a contact position between the insert protrusion 321 and the recess 322. The fixed connection surface 273 comprises a fixed connection surface between the lower surface of the insert protrusion 321 and the inner bottom surface of the mold groove, a fixed connection surface between the side wall of the insert protrusion 321 and the inner side wall of the mold groove, and a fixed connection surface between the upper surface of the insert protrusion 321 and the lower end surface of the hollow tube 25, wherein the fixed connection surface 273 can be welded, bonded or any surface which is connected with each other by the prior art. The fixed connection surface 273 further improves the connection strength at the connection between the hollow tube 25 and the packing tube 26; meanwhile, the hollow tube 25 and the packaging tube 26 can be pre-fixed in the packaging process, namely the insert protrusion 321 is firstly placed into the mold groove, the insert protrusion 321 and the packaging tube 26 are pre-fixed through the fixed connection surface 273, displacement of the insert protrusion 321 in the subsequent assembly process is prevented, then the hollow tube 25 or the packaging tube 26 is pressed on the insert protrusion 321, and the insert protrusion is completely and firmly fixed with the radial fixed connection surface 271 and/or the axial fixed connection surface 272 of the packaging tube 26 through the hollow tube 25.

In order to reduce turbulence, reduce the shearing force to the feed liquid that does not bear shearing, also avoid producing the dead angle that the feed liquid gathered, the interior surface of hollow tube 25 and encapsulation 26 axial junction flushes, and the inside wall of ladder structure 261 and the inside wall of hollow tube 25 are in same flush along its axial promptly, flush setting is for the non-flush plane such as crooked turning, and the hydrops can wash away promptly, can not produce the accumulation of feed liquid.

The above-described structures are all structures on the side of the liquid inlet 23, and the structure on the side of the permeate inlet 24 is not particularly limited, and the specific structure on the side of the permeate inlet 24 in this embodiment will be described.

As shown in fig. 10 to 14, the external pressure type hollow fiber membrane module further includes a stabilizing portion 6 extending along the circumferential direction of the hollow fiber membrane bundle 1 and surrounding at least the boundary between the second potting portion 12 and the filtration portion 13, thereby forming a spacing fixation for at least part of the hollow fiber membrane bundle 1. In the present embodiment, the stabilizing portion 6 surrounds the entire axial direction of the second potting portion 12 and extends in a direction approaching the liquid inlet 23. The fixed assembly structure between the stabilizing portion 6 and the hollow tube 25, and between the stabilizing portion 26 and the fixed assembly structure of the stabilizing portion 3 are similar, and will not be described again. When a large amount of permeate is discharged from the permeate port 24, the second encapsulating part 12 is surrounded and fixed by the stabilizing part 6, so that the shaking of the hollow fiber membrane bundles 1 near the second encapsulating part 12 along with the impact of a large amount of permeate is reduced, the shaking of the second encapsulating part 12 is avoided, the shaking of the whole hollow fiber membrane wires is driven, the change of the interval between adjacent hollow fiber membrane wires and even the close contact between the membrane wires are avoided, the blocking of the filtration holes of the hollow fiber membrane wires is further caused, and the effective filtration area and the good filtration efficiency of the filtration part 13 are ensured; the shaking of the hollow fiber membrane wires is reduced, so that the damage caused by collision between adjacent membrane wires is avoided, and the service life of the hollow fiber membrane bundles is prolonged; meanwhile, the stabilizing part 6 can not cover all the filtering parts 13, so that the liquid can be filtered by fully utilizing the filtering parts 13, and the efficient filtering efficiency is ensured.

The region of the side wall 22 of the container 2, which is close to the permeate port 24, is provided with a retentate port 28, and the stabilizing portion 6 extends towards the direction close to the liquid inlet 23 and at least extends to cover the retentate port 28, so that the retentate in the container 2 can be transferred to the outside of the container 2 in time. Meanwhile, as shown in fig. 13 and 14, as the retentate flows out from the retentate port 28, the hollow fiber membrane filaments are extruded to bend in the direction towards the retentate port 28, the hollow fiber membrane filaments are broken off when the retentate port 28 is close to the port of the hollow fiber membrane filaments, and the retentate port 28 is covered by the shielding region 61 through the projection of the stabilizing portion 6 perpendicular to the axial direction of the hollow fiber membrane bundle 1, i.e. the shielding region 61 is just opposite to the retentate port 28 to shield the retentate port 28, and when the feed liquid bends the hollow fiber membrane filaments towards the direction of the retentate port 28, the shielding region 61 shields the hollow fiber membrane filaments near the retentate port 28, so that the hollow fiber membrane filaments are prevented from being broken when the retentate flows out through the retentate port 28. The stabilizing section 6 is also provided with a liquid exchange region 62, and the liquid exchange region 62 is provided with a through hole 621, and the through hole 621 is used for communicating the accommodating cavity 21 and the filtering section 13, so that the supply liquid is further transferred to the filtering section 13 for filtering.

Of course, in other embodiments, the retentate port 28 may not be provided, and the retentate accumulated in the container 2 may be poured out through the feed port 23 at one time.

The other structures of the stabilizing portion 6 are similar to those of the stabilizing portion 3, and will not be described again.

The utility model is implemented by the principle that the feed liquid (the liquid to be fed after the upstream treatment) enters the runner 4 from the liquid inlet 23, namely, the feed liquid sequentially passes through the gap 5 and the communication channel 51 and enters the accommodating cavity 21 of the container 2, and of course, part of the feed liquid can flow to the hollow fiber membrane bundles directly through the through holes 31 of the stabilizing part 3 instead of passing through the accommodating cavity 21 after entering the gap 5, and due to the arrangement of the stabilizing part 3, even if the flow rate of the feed liquid is large, the stabilizing part 3 can form an effective limiting and fixing effect on the hollow fiber membrane bundles 1, so that the shaking of the first encapsulating part 11 drives the whole hollow fiber membrane bundles 1 is avoided, the reduction of the interval between adjacent hollow fiber membrane filaments, even the close contact between the membrane filaments and the membrane filaments is avoided, the blocking of the hollow fiber membrane filament filter holes is not caused, and the effective filter area and good filter efficiency of the filter part 13 are ensured; when passing through the hollow fiber membrane wire filtering holes, the feed liquid enters the hollow fiber membrane wire inner cavity through the hollow fiber membrane wire filtering holes, namely, an external pressure type filtering mode that the hollow fiber membrane wires enter the hollow fiber membrane wire inner cavity from the outside is realized, the filtered permeate liquid (ultrafiltration water in the embodiment) flows to the hollow fiber membrane wire port of the second encapsulating part 12, and finally, is discharged through the permeate liquid port 24, and the hollow fiber membrane wires cannot shake greatly under the limiting and fixing effects of the stabilizing part 6 on the second encapsulating part 12, so that the hollow fiber membrane wires are prevented from being damaged; the retentate is retained in the container 2, the retentate can be discharged out of the container 2 through the retentate port 28 at one time, the permeate port 28 is blocked by the blocking area 61 arranged at the corresponding position of the retentate port 28, and when the feed liquid is extruded to bend towards the direction of the retentate port 28, the blocking area 61 can form blocking protection for the hollow fiber membrane wires, so that the hollow fiber membrane wires are prevented from being broken along with the flow of the feed liquid.

Example two

The present embodiment is different from the first embodiment in that, as shown in fig. 15, the insertion protrusion 321 is provided in the middle of the securing portion 3.

Further, as shown in fig. 16, the end 34 of the stabilizing portion 3 may extend in the direction of the permeate port 24 all the time, at this time, the axial length of the stabilizing portion 3 is relatively large, and even covers 1/2 of the axial length of the filtering portion 13, so as to further improve the fixing effect between the stabilizing portion 3 and the container 2, and improve the firmness of the connecting the stabilizing portion 3 to the container 2, thereby improving the impact resistance of the stabilizing portion 3, and avoiding the shaking of the stabilizing portion 3 to drive the hollow fiber membrane bundle 1.

The foregoing detailed description is provided to illustrate the present utility model and not to limit the utility model, and any modifications and changes made to the present utility model within the spirit of the present utility model and the scope of the appended claims fall within the scope of the present utility model.

Claims (12)

1. An external pressure type hollow fiber membrane module comprising:

the hollow fiber membrane bundle consists of a plurality of hollow fiber membrane filaments, and comprises a first encapsulating part, a second encapsulating part and a filtering part, wherein the first encapsulating part and the second encapsulating part are oppositely arranged along the axial direction of the hollow fiber membrane bundle, the filtering part is positioned between the first encapsulating part and the second encapsulating part, the plurality of hollow fiber membrane filaments of the first encapsulating part are adhered and the ports of the hollow fiber membrane filaments are closed, and the plurality of hollow fiber membrane filaments of the second encapsulating part are adhered and the ports of the hollow fiber membrane filaments are open;

The container comprises a containing cavity and a side wall, the containing cavity extends along the axial direction of the hollow fiber membrane bundle, the side wall surrounds the containing cavity, the hollow fiber membrane bundle is arranged in the containing cavity, and a liquid inlet and a penetrating liquid outlet are respectively formed at two axial ends of the side wall corresponding to the hollow fiber membrane bundle;

the second filling and sealing part is arranged at a position corresponding to the permeate port in the container and forms a seal with the container, and the first filling and sealing part is arranged at a position corresponding to the permeate port in the container; it is characterized in that the method comprises the steps of,

the stabilizing part extends along the circumferential direction of the hollow fiber membrane bundle and at least surrounds the junction of the first encapsulating part and the filtering part so as to form limit fixation on at least part of the hollow fiber membrane bundle; and a flow channel is formed between the stabilizing part and the side wall of the container so as to be communicated with the liquid inlet and the accommodating cavity, so that the liquid passes through the liquid inlet, the flow channel, the accommodating cavity and the hollow fiber membrane wire inner cavity and flows out from the permeate liquid port.

2. The external pressure type hollow fiber membrane module according to claim 1, wherein: the filter part comprises an extension part close to the first filling and sealing part, and the stabilizing part extends along the axial direction of the hollow fiber membrane bundle towards a direction away from the liquid inlet and at least covers the extension part to form a fiber protection section.

3. The external pressure type hollow fiber membrane module according to claim 1, wherein: the flow passage comprises a gap and a communication channel, the gap is formed between the stabilizing part and the side wall of the container, the inner diameter of the gap is larger than the inner diameter of the accommodating cavity, and the communication channel is formed between the gap and the accommodating cavity for the circulation of feed liquid.

4. An external pressure type hollow fiber membrane module according to claim 3, wherein: the fixing part is provided with a through hole corresponding to the gap so as to communicate the gap with the filtering part.

5. The external pressure type hollow fiber membrane module according to claim 1, wherein: the axial length of the stabilizing part is L1, and the axial length of the hollow fiber membrane bundle is L, and then L1/L is 0.1-0.3.

6. An external pressure type hollow fiber membrane module according to claim 3, wherein: the connecting part is arranged between the stabilizing part and the container and comprises a mounting position arranged on the stabilizing part and a matching position arranged on the container, and the mounting position and the matching position are in plug-in matching.

7. The external pressure type hollow fiber membrane module according to claim 6, wherein: the mounting position is an inserting protrusion formed by extending along the radial direction from the outer wall of the stabilizing part, and the communication channel is formed between adjacent inserting protrusions; the container comprises a hollow tube extending along the axial direction of the hollow fiber membrane bundle and a packaging tube connected to two ends of the hollow tube, the containing cavity is formed in the hollow tube, and the matching position is a groove formed by axially connecting the packaging tube and the hollow tube.

8. The external pressure type hollow fiber membrane module according to claim 7, wherein: the inner surface of the axial connection part of the hollow tube and the packaging tube is flush.

9. The external pressure type hollow fiber membrane module according to claim 7, wherein: a radial fixed connection surface and/or an axial fixed connection surface are arranged between the packaging pipe and the hollow pipe; and a fixed connection surface is arranged at the contact position of the inserting convex and the groove.

10. The external pressure type hollow fiber membrane module according to claim 7, wherein: the stabilizing part comprises a starting end close to the liquid inlet and a tail end far away from the liquid inlet, the inserting protrusion is formed by bending the tail end of the stabilizing part radially outwards, and the bending part is in arc transition.

11. The external pressure type hollow fiber membrane module according to claim 1, wherein: the stabilizing part extends along the circumferential direction of the hollow fiber membrane bundle and at least surrounds the junction of the second encapsulating part and the filtering part so as to form limit fixation on at least part of the hollow fiber membrane bundle; the side wall of the container is provided with a retentate inlet, and the stabilizing part comprises a shielding area, and the shielding area covers the retentate inlet along the projection perpendicular to the axial direction of the hollow fiber membrane bundle.

12. The external pressure type hollow fiber membrane module according to claim 11, wherein: the stabilizing part further comprises a liquid exchange area, and the liquid exchange area is provided with a through hole for communicating the accommodating cavity and the filtering part.