Hollow fiber filtering assembly
By opening a channel on the baffle embedded area of the hollow fiber filtration component and forming a bridge connection, the problem of the problem of easy bending and baffle of the hollow membrane is solved, and the stability of the membrane wire protection and baffle is achieved. Reduce cost and operating complexity.
Patent Information
- Application Number
- CN202420262367.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-02-02
AI Technical Summary
During the tangential flow filtration process of traditional hollow fiber membrane filtration components, the hollow membrane filaments are easily affected by lateral forces and cause bending, and the baffle is susceptible to impact of the material liquid, resulting in a decrease in stability, which poses a risk of shedding.
Design a hollow fiber filtration component, set up a baffle between the hollow film beam and the side opening, and open a channel on the embedded area of the baffle to extend the radial radius of the fixed area to form a bridge connection to enhance the baffle to enhance the baffle Connecting stability with the tube wall.
Effectively protect the mid -vacant membrane, increase its service life, and enhance the connection stability of the baffle and the wall through the bridge joint, reduce the risk of falling off, and achieve the effect of low cost and simple process operation.
Smart Images
Figure CN222400976U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of filtering equipment, in particular to a hollow fiber filtering component. Background Art
[0002] Membrane separation technology is widely used in separation and purification processes due to its advantages of high separation efficiency, low energy consumption, high recovery rate of purified products, and easy operation. However, the traditional membrane separation process often adopts a dead-end form, which easily causes the material to form scale on the membrane surface, resulting in clogging of the membrane pores, thereby reducing the separation performance of the membrane. Therefore, in order to reduce the clogging of membrane pores, tangential flow filtration is widely used in fields such as biopharmaceuticals and semiconductors.
[0003] The hollow fiber membrane filtration assembly using tangential flow filtration generally includes a hollow membrane bundle and a hollow tube. The hollow membrane bundle is composed of multiple axially extending hollow membrane fibers. The feed liquid needs to enter or flow out of the hollow tube through the side opening. Since the feed liquid in the entire hollow tube needs to flow out through the side opening, the flow rate at the side opening position will be higher than that at other positions. The hollow membrane fibers near the side opening position may be affected by the lateral force and tend to bend, which can easily cause damage to the hollow membrane fibers. In order to protect the hollow membrane fibers, there is a solution in the prior art to block and limit the hollow membrane fibers by setting a baffle near the side opening position. However, since the flow rate at the side opening is relatively high, this increases the impact pressure of the feed liquid on the baffle, and the baffle is easily impacted by the feed liquid, resulting in a decrease in stability, and there is a problem that the baffle is easy to fall off. Utility Model Content
[0004] In order to overcome the deficiencies in the prior art, the utility model provides a hollow fiber filter assembly, which can increase the stability and reliability of the connection between the baffle and the tube wall, and has simple process operation and low implementation cost.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A hollow fiber filtration component comprises a hollow membrane bundle and a hollow tube, wherein the hollow tube comprises an inner cavity, a tube wall surrounding the inner cavity, a port and a side opening arranged on the tube wall, the hollow membrane bundle is arranged in the inner cavity, the hollow membrane bundle comprises a filtering portion and a potting portion arranged at the end of the filtering portion, the filtering portion comprises a plurality of axially extending and independently arranged hollow membrane filaments, the potting portion comprises a connecting area and a fixing area formed by curing the potting material, the fixing area is used to fix the connecting area to the tube wall of the hollow tube, a baffle is arranged between the hollow membrane bundle and the side opening, the baffle comprises an embedded area extending into the fixed area and a free area not extending into the fixed area, a channel is opened on the embedded area, and the fixed area radially extends into the channel to form a bridging portion.
[0007] When filtering the feed liquid, the above-mentioned hollow fiber filter assembly can adopt an internal pressure filtering mode or an external pressure filtering mode. The internal pressure filtering mode means that each hollow membrane fiber is hollow, and the ports at both ends of the hollow membrane fiber are open, and the side wall of the hollow membrane fiber has a plurality of hollow membrane fiber filter holes, allowing the feed liquid to flow between the outside of the hollow membrane fiber and the inner cavity of the hollow membrane fiber. The encapsulation part is a structure formed by encapsulating the ends of the hollow membrane fiber with adhesive materials and bonding the hollow membrane fibers to each other, and the hollow membrane fibers not bonded by the adhesive materials form the filtering part. When the feed liquid to be filtered, that is, the supply liquid, is filtered through the hollow membrane fiber, the feed liquid enters from one port of the hollow membrane fiber, passes through the hollow membrane fiber filter hole into the inner cavity to form a filtrate, and then discharges through the side opening, and the retentate formed by being blocked in the hollow membrane fiber cavity is discharged from another port. The external pressure filtration mode refers to: the supply liquid enters the inner cavity of the hollow membrane fiber through the hollow membrane fiber pores to form a filtrate, and the filtrate flows out through the hollow membrane fiber port, while the retentate is blocked outside the hollow membrane fiber to form a retentate; one port of the hollow membrane fiber is closed, and the other port is open. When the supply liquid enters the container from the side opening, it is then filtered through the hollow membrane fiber of the filtration part to perform an external pressure filtration mode, that is, the supply liquid passes through the hollow membrane fiber pores in turn and enters the inner cavity of the hollow membrane fiber to form a permeate, and the permeate flows out through the hollow membrane fiber port and the permeate port, while the retentate is blocked outside the hollow membrane fiber, and the retentate is retained in the container or flows out through other openings on the side wall of the container.
[0008] In the above technical solution, since the bridge portion is formed by radially extending from the fixed area into the channel, the bridge portion and the fixed area are actually an integrally formed structure, and are both formed by solidifying the potting material, and the connection between the bridge portion and the fixed area is relatively stable and reliable. When the hollow fiber filter assembly is filtering, the feed liquid or residual liquid needs to flow out of the hollow tube from the inner cavity through the side opening. Since the feed liquid in the entire inner cavity needs to flow out through the side opening, the flow rate at the side opening position will be higher than other positions. The hollow membrane filaments near the side opening position may be affected by the lateral force and tend to bend, which can easily cause damage to the hollow membrane filaments. This solution sets a baffle near the side opening to block and limit the hollow membrane filaments, which can limit the bending of the hollow membrane filaments and increase the service life of the hollow membrane filaments. However, since the flow velocity at the side opening is relatively high, this increases the impact pressure of the slurry on the baffle, and the baffle is easily impacted by the slurry, resulting in a decrease in stability. In order to enhance the stability of the baffle, this solution provides a channel on the embedded area, so that the fixed area radially extends into the channel to form a bridge portion, and the stability and reliability of the connection between the baffle and the tube wall are increased through the bridge portion. Compared with the solution of setting up a third independent connecting piece between the baffle and the tube wall, the connection structure adopted in this solution is more stable and reliable, and the process operation is simpler and the implementation cost is lower.
[0009] Preferably, the cross-sectional profile of the channel is a curve.
[0010] In the above technical solution, the solution can make it easier for the bridging part to fill the entire channel during molding, and it is not easy to form a corner position with low structural strength. It can increase the connection stability and reliability between the bridging part and the embedded area, and make the baffle more stably and reliably fixed in the hollow tube.
[0011] Preferably, two adjacent channels arranged axially along the hollow tube are staggered.
[0012] In the above technical solution, the solution can make the distribution of channels in the embedded area more uniform, so that the distribution of the formed bridge portion is more uniform, thereby increasing the stability and reliability of the connection between the baffle and the fixed area. At the same time, the staggered arrangement of the channels can also avoid the problem of too low strength of the baffle caused by the channels being arranged in the same row or column, thereby increasing the strength and stability of the baffle.
[0013] Preferably, the free zone comprises a shielding portion and a flow portion connected to the shielding portion, a radial projection of the side opening on the baffle overlaps with the shielding portion, and the flow portion is provided with a plurality of through holes.
[0014] In the above technical solution, the radial projection of the side opening on the baffle overlaps with the shielding portion, which can ensure that the hollow membrane filaments at the position opposite to the side opening can be shielded by the baffle, thereby effectively protecting the hollow membrane filaments at this position. The circulation portion is provided with a plurality of through holes, which can ensure that the opposite sides of the baffle at a position relatively far from the side opening can be connected through the through holes, thereby reducing the influence of the baffle on the flow efficiency of the feed liquid.
[0015] Preferably, the circulation portion extends circumferentially along the hollow tube and surrounds the hollow tube to form a surrounding cylinder.
[0016] In the above technical solution, the surrounding tube can restrain and limit the hollow membrane filaments from all directions, thereby ensuring the overall restraining effect of the baffle on the hollow membrane filaments. The surrounding tube can be sleeved on the outside of the hollow membrane bundle to restrain the hollow membrane filaments, and the outward expansion force of the hollow membrane filaments can be used to temporarily fix the surrounding tube, which is convenient for keeping the position of the surrounding tube and the hollow membrane filaments relatively stable during potting.
[0017] Preferably, the through holes are evenly distributed on the circulation portion, and the shortest axial spacing between adjacent through holes along the axis of the hollow tube is between 2-15 mm.
[0018] In the above technical solution, the through holes are evenly distributed on the circulation part, so that the slurry on both sides of the baffle can be connected through the through holes more evenly and stably, and the shortest axial spacing between adjacent through holes along the axis of the hollow tube is between 2-15mm, which is conducive to maintaining the uniformity of the through hole distribution.
[0019] Preferably, the area of the embedded region is S0, the sum of the cross-sectional areas of all channels is S1, and the ratio of S1 to S0 is in the range of 0.05-0.4.
[0020] In the above technical solution, since the bridging portion is formed by radially extending from the fixed area into the channel, the sum of the areas of all the bridging portions is equal to the sum of the cross-sectional areas of all the channels; when S0 remains unchanged, the larger the ratio range of S1 to S0, the larger the size and structural strength of the channel, i.e., the bridging portion, the better the fixing effect of the bridging portion on the baffle and the fixed area, but it will cause the structural strength of the embedded area itself to decrease; the smaller the ratio of S1 to S0, the smaller the opening area on the embedded area, the greater the structural strength of the embedded area itself, but the structural strength of the bridging portion will decrease, which will cause the fixing effect between the baffle and the fixed area to decrease. Therefore, it is necessary to control the ratio of S1 to S0 within the above range, which can not only ensure the structural strength of the embedded area itself, but also make the connection between the baffle and the fixed area relatively stable.
[0021] Preferably, a flow channel for liquid circulation is formed between the tube wall and the filter portion, the radial dimension of the flow channel is L1, the thickness of the baffle is L2, and the ratio of L1 to L2 is in the range of 2-8.
[0022] In the above technical solution, the larger the ratio of L1 to L2, the thicker the baffle is, and the greater its strength is. However, a thick baffle will reduce the space available for the liquid to flow in the flow channel, resulting in a decrease in the flow rate of the liquid. The smaller the ratio of L1 to L2, the smaller the space in the flow channel occupied by the baffle, and the larger the space available for the liquid to flow in the flow channel, and the greater the flow rate of the liquid. However, the reduced thickness of the baffle will result in a decrease in the strength of the baffle. Therefore, it is necessary to control the ratio of L1 to L2 within the above range to increase the flow rate of the liquid while ensuring the strength of the baffle.
[0023] Preferably, a connecting portion extending radially outward is provided on the outer side wall of the baffle, and the connecting portion is connected to the tube wall.
[0024] In the above technical solution, after the connecting portion is connected to the tube wall, the stability and reliability of the baffle can be further increased, the risk of the baffle falling off can be reduced, and the shaking amplitude of the baffle can be reduced.
[0025] Preferably, an end surface of the baffle away from the filtering portion is buried in the fixing area.
[0026] In the above technical solution, when the axial dimension of the channel is too large and the channel is not completely filled, the feed liquid may leak to the outside through the channel. Therefore, by locating the end of the baffle away from the filter portion in the fixed area, the problem of the baffle being exposed and causing the feed liquid to leak through the gap between the baffle and the fixed area is avoided.
[0027] Preferably, a protective net is provided on the outer side of the filter part, and the protective net is provided between the filter part and the baffle.
[0028] In the above technical solution, the protective net can surround the hollow membrane bundle, and has a binding and protective effect on the hollow membrane bundle. The baffle and the protective net can form a double protection for the hollow membrane bundle of the filter part, and increase the protective effect on the hollow membrane bundle.
[0029] The beneficial effects of the utility model are:
[0030] (1) By opening a channel on the embedded area of the baffle, the fixing area radially extends into the channel to form a bridge portion, and the bridge portion increases the stability and reliability of the connection between the baffle and the tube wall. Compared with the solution of setting up a third independent connecting piece between the baffle and the tube wall, the connection structure adopted in this solution is more stable and reliable, and the process operation is simpler and the implementation cost is lower;
[0031] (2) The radial projection of the side opening on the baffle overlaps with the shielding portion, which can ensure that the hollow membrane filaments at the position opposite to the side opening can be shielded by the baffle, thereby effectively protecting the hollow membrane filaments at this position. The circulation portion is provided with a plurality of through holes, which can ensure that the opposite sides of the baffle at a position relatively far from the side opening can be connected through the through holes, thereby reducing the influence of the baffle on the flow efficiency of the feed liquid;
[0032] (3) The circulation portion extends along the circumference of the hollow tube and surrounds to form a surrounding tube, which can restrain and limit the hollow membrane filaments from all directions, thereby ensuring the overall restraining effect of the baffle on the hollow membrane filaments. The surrounding tube can be sleeved on the outside of the hollow membrane bundle to restrain the hollow membrane filaments, and the outward expansion force of the hollow membrane filaments can be used to temporarily fix the surrounding tube, which is convenient for keeping the position of the surrounding tube and the hollow membrane filaments relatively stable during potting. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 (Internal pressure filtration mode);
[0034] Figure 2 yes Figure 1 A partial enlarged view of the middle A;
[0035] Figure 3 is a schematic structural diagram of the baffle in Example 1;
[0036] Figure 4 is a schematic structural diagram of the baffle in Example 2;
[0037] Figure 5 This is a schematic diagram of the structure of the utility model Figure 2 (External pressure filtration mode).
[0038] In the figure: hollow membrane bundle 1, potting part 11, connecting area 111, fixing area 112, bridging part 113, filtering part 12, hollow tube 2, inner cavity 21, tube wall 22, port 23, side opening 24, flow channel 25, baffle 3, embedded area 31, channel 311, free area 32, shielding part 33, circulation part 34, through hole 341, surrounding tube 35, connecting part 36, protective net 5, hollow end cap 6. DETAILED DESCRIPTION
[0039] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] Embodiment 1:
[0041] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a hollow fiber filtration component comprises a hollow membrane bundle 1, a hollow tube 2 and hollow end caps 6 arranged at both ends of the hollow tube 2, the hollow end caps 6 are used to communicate with an external pipeline, the hollow tube 2 comprises an inner cavity 21, a tube wall 22 surrounding the inner cavity 21, a port 23 and a side opening 24 arranged on the tube wall 22, the side opening 24 is used to communicate with an external pipeline, the hollow membrane bundle 1 is arranged in the inner cavity 21, the hollow membrane bundle 1 comprises a filter part 12 and a potting part 11 arranged at the end of the filter part 12, the filter part 12 comprises a plurality of The hollow membrane filaments are axially extended and independently arranged, and the potting portion 11 includes a connecting area 111 and a fixing area 112 formed by curing the potting material, and the fixing area 112 is used to fix the connecting area 111 to the tube wall 22 of the hollow tube 2. A baffle 3 is provided between the hollow membrane bundle 1 and the side opening 24, and the baffle 3 includes an embedded area 31 extending into the fixing area 112 and a free area 32 not extending into the fixing area 112. A channel 311 is opened on the embedded area 31, and the fixing area 112 radially extends into the channel 311 to form a bridging portion 113.
[0042] In the above technical solution, since the bridge portion 113 is formed by radially extending from the fixed area 112 to the channel 311, the bridge portion 113 and the fixed area 112 are actually an integrally formed structure, and are both formed by curing the potting material, and the connection between the bridge portion 113 and the fixed area 112 is relatively stable and reliable. When the hollow fiber filter assembly is filtering, the feed liquid or residual liquid needs to flow out of the inner cavity 21 to the outside of the hollow tube 2 through the side opening 24. Since the feed liquid in the entire inner cavity needs to flow out through the side opening 24, the flow rate at the side opening 24 position will be higher than other positions. The hollow membrane filaments near the side opening 24 may be affected by the lateral force and tend to bend toward the side opening 24, which can easily cause damage to the hollow membrane filaments. This solution sets a baffle 3 at a position close to the side opening 24 to block and limit the hollow membrane filaments, which can limit the bending of the hollow membrane filaments and increase the service life of the hollow membrane filaments. However, since the flow velocity at the side opening 24 is relatively high, the impact pressure of the slurry on the baffle 3 is increased, and the baffle 3 is easily impacted by the slurry and the stability is reduced. In order to enhance the stability of the baffle 3, the present solution provides a channel 311 on the embedded area 31, so that the fixed area 112 radially extends into the channel 311 to form a bridge portion 113. The stability and reliability of the connection between the baffle 3 and the tube wall 22 are increased through the bridge portion 113. Compared with the solution of setting up a third independent connecting piece between the baffle 3 and the tube wall 22, the connection structure adopted in the present solution is more stable and reliable, and the process operation is simpler and the implementation cost is lower.
[0043] Specifically, the potting parts 11 are disposed at both ends of the hollow membrane bundle 1 , and correspondingly, the side openings 24 are also disposed at two positions of the hollow tube 2 close to the two potting parts 11 .
[0044] Preferably, the cross-sectional profile of the channel 311 is a curve, and two adjacent channels 311 arranged axially along the hollow tube 2 are staggered.
[0045] In the above technical solution, the solution can make it easier for the bridge portion 113 to fill the entire channel 311 during molding, and it is not easy to form a corner position with low structural strength, which can increase the connection stability and reliability between the bridge portion 113 and the embedded area 31, and make the baffle 3 more stably and reliably fixed in the hollow tube 2. The staggered arrangement of two adjacent channels 311 can make the channels 311 in the embedded area 31 more evenly distributed, so that the formed bridge portion 113 is more evenly distributed, thereby increasing the stability and reliability of the connection between the baffle 3 and the fixed area 112. At the same time, the staggered arrangement of the channels 311 can also avoid the problem of too low strength of the baffle 3 caused by the channels 311 being arranged in the same row or the same column, thereby increasing the strength and stability of the baffle 3.
[0046] Preferably, the end surface of the baffle 3 away from the filter portion 12 is buried in the fixed area 112. The free area 32 of the baffle 3 includes a shielding portion 33 and a circulation portion 34 connected to the shielding portion 33, the radial projection of the side opening 24 on the baffle 3 overlaps with the shielding portion 33, and the circulation portion 34 is provided with a plurality of through holes 341. The through holes 341 are evenly distributed on the circulation portion 34, and the shortest axial spacing between adjacent through holes 341 along the axis of the hollow tube 2 is between 2-15mm, which is conducive to maintaining the uniformity of the distribution of the through holes 341. In this example, the uniform distribution of the through holes 341 means that the spacing between two adjacent through holes 341 in the axial direction is equal, and the spacing between two adjacent through holes 341 in the circumferential direction is equal. The circulation portion 34 extends circumferentially along the hollow tube 2 and surrounds to form a circumferential tube 35. The outer wall of the baffle 3 is provided with a plurality of connecting portions 36 extending radially outward, and the connecting portions 36 are connected to the tube wall 22. A plurality of connecting parts 36 are evenly arranged axially along the axis of the surrounding tube 35 , and a groove adapted to the connecting part 36 is provided on the tube wall 22 of the hollow tube 2 , and one end of the connecting part 36 extends into the groove.
[0047] In the above technical solution, when the axial dimension of the channel 311 is too large and the channel 311 is not completely filled, the feed liquid may leak to the outside through the channel 311. Therefore, by making the end of the baffle 3 away from the filter part 12 located in the fixed area 112, the problem of the baffle 3 being exposed and causing the feed liquid to leak through the gap between the baffle 3 and the fixed area 112 is avoided. The radial projection of the side opening 24 on the baffle 3 overlaps with the shielding portion 33, which can ensure that the hollow membrane filaments at the position opposite to the side opening 24 can be shielded by the baffle 3, thereby effectively protecting the hollow membrane filaments at this position. The circulation portion 34 is provided with a plurality of through holes 341, which can ensure that the opposite sides of the baffle 3 at the position relatively far from the side opening 24 can be connected through the through holes 341, thereby reducing the influence of the baffle 3 on the flow efficiency of the feed liquid. The surrounding tube 35 can restrain and limit the hollow membrane filaments from all directions, thereby ensuring the overall restraining effect of the baffle 3 on the hollow membrane filaments. The shroud 35 can be sleeved on the outside of the hollow membrane bundle 1 to restrain the hollow membrane filaments. The outward expansion force of the hollow membrane filaments can be used to temporarily fix the shroud 35, so as to keep the positions of the shroud 35 and the hollow membrane filaments relatively stable during potting. The through holes 341 are evenly distributed on the circulation portion 34, so that the slurry on both sides of the baffle 3 can be connected through the through holes 341 in a relatively uniform and stable manner. After the connecting portion 36 is connected to the tube wall 22, the stability and reliability of the baffle 3 can be further increased, the risk of the baffle 3 falling off can be reduced, and the shaking amplitude of the baffle 3 can be reduced.
[0048] Preferably, the area of the embedded area 31 is S0, the sum of the cross-sectional areas of all the channels 311 is S1, and the ratio of S1 to S0 is in the range of 0.05-0.4.
[0049] In the above technical solution, since the bridging portion 113 is formed by radially extending from the fixing area 112 to the channel 311, the sum of the areas of all the bridging portions 113 is equal to the sum of the cross-sectional areas of all the channels 311; when S0 remains unchanged, the larger the ratio range of S1 to S0, the larger the size and structural strength of the channel 311, i.e., the bridging portion 113, the better the fixing effect of the bridging portion 113 on the baffle 3 and the fixing area 112, but it will cause the structural strength of the embedding area 31 itself to decrease; the smaller the ratio of S1 to S0, the smaller the opening area on the embedding area 31, the greater the structural strength of the embedding area 31 itself, but the structural strength of the bridging portion 113 will decrease, which will cause the fixing effect between the baffle 3 and the fixing area 112 to decrease. Therefore, it is necessary to control the ratio of S1 to S0 within the above range, so as to ensure the structural strength of the embedding area 31 itself and make the connection between the baffle 3 and the fixing area 112 relatively stable.
[0050] Preferably, a flow channel 311 for liquid circulation is formed between the tube wall 22 and the filter portion 12, the radial dimension of the flow channel 311 is L1, the thickness of the baffle 3 is L2, and the ratio of L1 to L2 is in the range of 2-8.
[0051] In the above technical solution, the larger the ratio of L1 to L2, the thicker the baffle 3 is, and the greater its strength is. However, the thicker the baffle 3 is, the smaller the space available for the liquid to flow in the flow channel 311 is, resulting in a decrease in the flow rate of the liquid. The smaller the ratio of L1 to L2 is, the smaller the space in the flow channel 311 occupied by the baffle 3 is, the larger the space available for the liquid to flow in the flow channel 311 is, and the greater the flow rate of the liquid is. However, the reduced thickness of the baffle 3 will result in a decrease in the strength of the baffle 3. Therefore, it is necessary to control the ratio of L1 to L2 within the above range to increase the flow rate of the liquid while ensuring the strength of the baffle 3.
[0052] Preferably, a protective net 5 is provided on the outside of the filter part 12, and the protective net 5 is provided between the filter part 12 and the baffle 3. In the above technical solution, the protective net 5 can surround the hollow membrane bundle 1 of the filter part 12, and has a binding and protective effect on the hollow membrane bundle 1. The baffle 3 and the protective net 5 can form a double protection for the hollow membrane bundle 1, thereby increasing the protective effect on the hollow membrane bundle 1.
[0053] Embodiment 2:
[0054] like Figure 4 As shown, the difference between this embodiment and implementation 1 is that no through hole is provided in the free area 32. The rest of the scheme of this embodiment is the same as that of implementation 1.
Claims
1. A hollow fiber filtration component, comprising a hollow membrane bundle and a hollow tube, wherein the hollow tube comprises an inner cavity, a tube wall surrounding the inner cavity, a port and a side opening arranged on the tube wall, wherein the hollow membrane bundle is arranged in the inner cavity, the hollow membrane bundle comprises a filter portion and a potting portion arranged at the end of the filter portion, wherein the filter portion comprises a plurality of axially extending and independently arranged hollow membrane fibers, wherein the potting portion comprises a connecting area and a fixing area formed by curing the potting material, wherein the fixing area is used to fix the connecting area to the tube wall of the hollow tube ... A baffle is provided between the hollow membrane bundle and the side opening, the baffle comprising an embedded area extending into the fixed area and a free area not extending into the fixed area, a channel is opened on the embedded area, and the fixed area radially extends into the channel to form a bridging portion.
2. A hollow fiber filter assembly according to claim 1, characterized in that: The cross-sectional profile of the channel is a curve.
3. The hollow fiber filter assembly according to claim 1, characterized in that: Two adjacent channels arranged along the axial direction of the hollow tube are staggered.
4. The hollow fiber filter assembly according to claim 1, characterized in that: The free zone includes a shielding portion and a flow portion connected to the shielding portion, a radial projection of the side opening on the baffle overlaps with the shielding portion, and the flow portion is provided with a plurality of through holes.
5. A hollow fiber filter assembly according to claim 4, characterized in that: The flow portion extends along the circumference of the hollow tube and surrounds the hollow tube to form a surrounding cylinder.
6. A hollow fiber filter assembly according to any one of claims 4 or 5, characterized in that: The through holes are evenly distributed on the circulation portion, and the shortest axial spacing between adjacent through holes along the axis of the hollow tube is between 2-15 mm.
7. A hollow fiber filter assembly according to claim 1, wherein the area of the embedded area is S0, the sum of the cross-sectional areas of all channels is S1, and the ratio of S1 to S0 is in the range of 0.05-0.
4.
8. The hollow fiber filter assembly according to claim 1, characterized in that: A flow channel for liquid circulation is formed between the tube wall and the filter portion, the radial dimension of the flow channel is L1, the thickness of the baffle is L2, and the ratio of L1 to L2 is in the range of 2-8.
9. The hollow fiber filter assembly according to claim 1, characterized in that: A connecting portion extending radially outward is provided on the outer side wall of the baffle, and the connecting portion is connected to the tube wall.
10. The hollow fiber filter assembly according to claim 1, characterized in that: The end surface of the baffle away from one end of the filter portion is buried in the fixing area.
11. The hollow fiber filter assembly according to claim 1, characterized in that: A protective net is sleeved on the outer side of the filter part, and the protective net is arranged between the filter part and the baffle.