Hollow fiber filter
By setting a barrier cartridge and a protection area with deviation openings in the hollow fiber filter, the high pressure and hollow film wire damage caused by the convergence of the material and liquid are solved, and a higher flow rate and longer film wire life are achieved.
Patent Information
- Application Number
- CN202420262366.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-02-02
AI Technical Summary
During the tangential flow filtration process of traditional hollow fiber membrane filters, the convergence of the material liquid near the side opening leads to high pressure, which easily damages the hollow membrane wire, and the insertion of the stopper occupies the flow space to reduce the flow rate.
A hollow fiber filter is designed, and the opening of the stopper is set and a flow area is formed to allow the material liquid to pass smoothly, increase the flow rate, and protect the hollow film wire through the protection area to reduce damage.
It improves the flow smoothness and flow rate of the material liquid, reduces the pressure of the material liquid near the side opening, and extends the service life of the hollow film wire.
Smart Images
Figure CN222427639U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of filtering equipment, in particular to a hollow fiber filter. 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 tube and a hollow membrane bundle located inside the 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 feed liquid with a high flow rate has a greater impact force on the hollow membrane fibers, thereby pulling the hollow membrane fibers near the side opening position to bend more easily toward the side opening direction. When the bent hollow membrane fibers hit the edge of the side opening, the hollow membrane fibers are easily damaged. In order to solve the above problems, a retaining cylinder is generally set between the side opening and the hollow membrane fibers to prevent the hollow membrane fibers from being bent and damaged by the pull of the feed liquid. However, the insertion of the retaining cylinder will occupy a part of the space for the flow of the feed liquid, thereby reducing the space for the flow of the feed liquid, thereby reducing the flow rate of the hollow fiber filter. Utility Model Content
[0004] In order to overcome the deficiencies in the prior art, the utility model provides a hollow fiber filter, which can make the feed liquid pass through the side opening more smoothly, thereby improving the feed liquid flow rate, while reducing the pressure raised by the feed liquid converging near the side opening, thereby reducing damage to the hollow membrane fibers.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A hollow fiber filter 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 part and a potting part arranged at the end of the filtering part, the potting part is fixedly connected to the tube wall of the hollow tube, the filtering part comprises a plurality of axially extending and independently arranged hollow membrane filaments, a retaining cylinder is arranged in the inner cavity, one end of the retaining cylinder radially extends into the potting part to form an embedding area, the retaining cylinder is sleeved on the outside of the hollow membrane bundle and is coaxially arranged with the hollow membrane bundle, the axis of the retaining cylinder is away from the side outlet relative to the axis of the inner cavity to form a flow area between the outer wall of the retaining cylinder and the side opening.
[0007] When filtering the feed liquid, the above-mentioned hollow fiber filter 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, the circulation space formed between the outer wall of the retaining cylinder and the tube wall of the inner cavity can be used for the flow of feed liquid. The circulation area is a part of the circulation space. The circulation area includes the position where the circulation space is directly opposite to the side opening (named as the deviation area), and the edge position around the circumference of the position. The range of the edge position can be limited according to actual needs. The hollow membrane bundle is located in the retaining cylinder and is coaxially arranged with the retaining cylinder, so that the hollow membrane bundle is constrained in the retaining cylinder. When filtering the feed liquid, the retaining cylinder can block and protect the hollow membrane filaments and limit the bending of the hollow membrane filaments, thereby protecting the hollow membrane filaments and increasing the service life of the hollow membrane filaments. When filtering the feed liquid, since a large amount of feed liquid is concentrated at the side outlet, it is easy to drive the membrane filaments here to bend toward the side opening and cause the membrane filaments to be damaged. Therefore, the retaining cylinder is set to deviate from the side opening and form a flow area, that is, the position of the flow area corresponds to the side opening and the space of the flow area is relatively large, so that the feed liquid can pass through here more smoothly, thereby improving the feed liquid flow rate, reducing the pressure raised by the feed liquid gathering here, and reducing the damage to the hollow membrane filaments.
[0009] Preferably, the distance between the axis of the retaining cylinder and the axis of the inner cavity is L1, the inner diameter of the hollow tube is d1, and the ratio of L1 to d1 is in the range of 0.01-0.07.
[0010] In the above technical scheme, the larger the ratio of L1 to d1, the larger the relative size of the circulation zone, the smoother the flow of the feed liquid, and the less likely the hollow membrane fiber is to be damaged. However, the size of the side of the circulation space opposite to the circulation zone (named the deviation zone) will be smaller, which will affect the flow of the feed liquid in the deviation zone. Therefore, it is necessary to set the ratio of L1 to d1 within the above range, which can not only meet the feed liquid flow rate on the side of the hollow membrane bundle away from the circulation zone, but also ensure the size of the circulation zone.
[0011] Preferably, two of the retaining cylinders are provided in the inner cavity, and the two retaining cylinders are relatively arranged at two ends of the hollow membrane bundle, wherein the axis of one of the retaining cylinders is away from the side outlet relative to the axis of the inner cavity, and the axis of the other retaining cylinder is at a distance from the axis of the inner cavity; or, two of the retaining cylinders are provided in the inner cavity, and the two retaining cylinders are relatively arranged at two ends of the hollow membrane bundle, and the axes of the two retaining cylinders are away from the side outlet relative to the axis of the inner cavity.
[0012] In the first technical solution mentioned above, only one end of the hollow membrane bundle is relatively far away from the side outlet, and the other end remains in a centered state. When filtering, the side opening of the centered end of the hollow membrane bundle is sealed. The centered hollow membrane bundle can make the distance between the hollow membrane bundle and the tube wall basically the same in all directions, so that the feed liquid flows more evenly. In the second technical solution mentioned above, the axes of the two retaining cylinders are offset to the side away from the side outlet relative to the axis of the inner cavity, so that the hollow membrane bundle as a whole can deviate to the side away from the side outlet. The two ends of the hollow membrane bundle have the same structure, and there is no need to distinguish between the two ends during installation and use, which is convenient for installation and use.
[0013] Preferably, the cross-sectional area of the side opening is S1, the cross-sectional area of the inner cavity is S0, the cross-sectional area of the range covered by the outer diameter of the retaining cylinder is S2, and the ratio of S1 to (S0-S2) is in the range of 0.1-0.8.
[0014] In the above technical solution, S0-S2 is the area of the gap between the retaining tube and the tube wall. The larger the ratio of S1 to (S0-S2), the larger the size of the side opening compared to the gap, and the larger the flow rate at the side opening position, which can increase the overall flow rate of the filter, but the liquid flow rate at the gap position will also increase, resulting in an increase in the impact on the hollow membrane filaments, affecting the life of the hollow membrane filaments; the smaller the ratio of S1 to (S0-S2), the larger the size of the gap compared to the side opening, the slower the liquid flow rate in the gap, and the less likely the hollow membrane filaments are to be damaged, but the flow rate at the side opening is relatively too small, which will affect the overall filtration efficiency. Therefore, it is necessary to set the ratio of S1 to (S0-S2) within the above range, which can not only ensure the overall flow rate of the filter, but also control the impact force on the hollow membrane filaments within a reasonable range.
[0015] Preferably, the extension line of the axis of the side opening passes through the axis of the hollow membrane bundle, and the angle between the two is between 85-95°.
[0016] In the above technical solution, the plane passing through the axis of the side outlet and the axis of the hollow membrane bundle is the reference plane, and the side outlet and the hollow membrane bundle are both divided into two symmetrical parts by the reference plane. The liquid on both sides of the reference plane can flow to the side outlet or flow in from the side outlet evenly and symmetrically, which is conducive to ensuring that the hollow membrane bundle is evenly stressed on both sides of the side opening to avoid damage. The angle is controlled between 85-95° to avoid excessive tilting of the hollow membrane bundle and affect the uniformity of the liquid flow process.
[0017] Preferably, the portion of the retaining cylinder outside the potting portion is a protection zone, and the radial projection of the protection zone on the tube wall covers the side opening.
[0018] In the above technical solution, the corresponding positions of the side openings on the retaining cylinder are all within the protection zone, and the protection zone can effectively protect the hollow membrane filaments near the side openings. Moreover, the protection zones are all located outside the potting part, which can ensure that the side openings are not blocked by the potting part, thereby ensuring the flow efficiency of the side openings.
[0019] Preferably, the axial distance between the end surface of the protection zone away from one end of the potting portion and the side opening is L2, the axial length of the filter portion is L0, and the ratio of L2 to L0 is in the range of 0.02-0.08.
[0020] In the above technical scheme, the larger the ratio of L2 to L0, the better the protective effect of the baffle on the filter part, but the too long baffle will occupy a larger space in the inner cavity, which will easily reduce the flow condition and flow rate of the slurry in the filter part; the smaller the ratio of L2 to L0, the smaller the space in the inner cavity occupied by the baffle, and the smaller the impact on the flow condition and flow rate of the slurry in the filter part, but it will cause the protective effect of the baffle on the filter part to decrease. Therefore, it is necessary to set the ratio of L2 to L0 within the above range, which can not only ensure the protective effect of the baffle on the filter part, but also control the impact of the baffle on the flow condition and flow rate of the slurry in the filter part within a reasonable range.
[0021] Preferably, the radial wall thickness of the retaining cylinder is L3, the outer diameter of the retaining cylinder is D2, and the ratio of L3 to D2 is in the range of 0.01-0.5.
[0022] In the above technical solution, the greater the ratio of L3 to D2, the greater the relative thickness of the retaining tube and the greater the strength. However, a thick retaining tube will reduce the space in the inner cavity for the liquid to flow, resulting in a decrease in the flow rate of the liquid. The smaller the ratio of L3 to D2, the smaller the space in the inner cavity occupied by the retaining tube, the greater the space in the inner cavity for the liquid to flow, and the greater the flow rate of the liquid. However, the reduced thickness of the retaining tube will result in a decrease in the strength of the retaining tube. Therefore, it is necessary to control the ratio of L3 to D2 within the above range to increase the flow rate of the liquid while ensuring the strength of the retaining tube.
[0023] Preferably, the baffle is provided with a through hole at the position corresponding to the side opening, so that the liquid in the baffle flows to the outside of the baffle through the through hole. The through hole can connect the inside and outside of the baffle, thereby reducing the influence of the baffle on the flow efficiency of the liquid.
[0024] Preferably, a connecting piece is provided between the retaining tube and the hollow tube, the connecting piece is fixed to the tube wall, and an end of the connecting piece abuts against an outer side wall of the retaining tube.
[0025] In the above technical solution, the connecting piece can limit the retaining tube, which can increase the stability and reliability of the retaining tube, reduce the risk of the retaining tube falling off, and reduce the shaking amplitude of the retaining tube. The end of the connecting piece and the outer wall of the retaining tube can be connected by interference fit, ultrasonic welding, or adhesive bonding.
[0026] Preferably, there are multiple connectors, which are circumferentially spaced apart on the tube wall, and the surfaces of the multiple connectors in contact with the outer wall of the retaining tube are on the same reference cylindrical surface, and the axis of the reference cylindrical surface is coaxially arranged with the axis of the retaining tube.
[0027] In the above technical solution, the multiple connectors can position the retaining cylinder during the assembly process of the hollow fiber filter, without the need for other positioning tools, which simplifies the assembly process and improves assembly efficiency. The multiple connectors can also further increase the stability and reliability of the retaining cylinder, reduce the risk of the retaining cylinder falling off, and reduce the shaking amplitude of the retaining cylinder.
[0028] The beneficial effects of the utility model are:
[0029] (1) The baffle cylinder is arranged away from the side opening to form a flow zone. Since the flow zone is located at the side opening and has a relatively large space, the liquid can pass through it more smoothly, thereby increasing the liquid flow rate and reducing the pressure raised by the liquid gathering here, thereby reducing the damage to the hollow membrane fibers.
[0030] (2) The corresponding positions of the side openings on the retaining cylinder are all within the protection zone, and the protection zone can effectively protect the hollow membrane fibers near the side openings. Moreover, the protection zones are all located outside the potting portion, which can ensure that the side openings are not blocked by the potting portion, thereby ensuring the flow efficiency of the side openings;
[0031] (3) The connecting member can limit the position of the retaining cylinder, thereby increasing the stability and reliability of the retaining cylinder, reducing the risk of the retaining cylinder falling off, and reducing the shaking amplitude of the retaining cylinder;
[0032] (4) Multiple connectors can be used to position the retaining cylinder during the assembly process of the hollow fiber filter. No other positioning tools are required for positioning, which simplifies the assembly process and improves assembly efficiency. Multiple connectors can also further increase the stability and reliability of the retaining cylinder, reduce the risk of the retaining cylinder falling off, and reduce the shaking amplitude of the retaining cylinder. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a schematic diagram of the structure of the utility model (the X1 axis is parallel to the X2 axis);
[0034] Figure 2 yes Figure 1A partial enlarged view of the middle A;
[0035] Figure 3 It is a structural schematic diagram of the middle stopper of the utility model;
[0036] Figure 4 It is a structural schematic diagram of the utility model (Structure 1 when the X1 axis is not parallel to the X2 axis);
[0037] Figure 5 It is a schematic diagram of the structure of the utility model (Structure 2 when the X1 axis is not parallel to the X2 axis).
[0038] In the figure: hollow membrane bundle 1, potting part 11, filtering part 12, hollow tube 2, inner cavity 21, tube wall 22, port 23, side opening 24, retaining cylinder 3, embedding area 31, protection area 32, through hole 33, flow area 4, connecting piece 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] like Figures 1 to 5 As shown, a hollow fiber filter comprises a hollow membrane bundle 1, a hollow tube 2 and hollow end caps 6 arranged at both ends of the hollow tube 2, wherein 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, wherein 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 filtering part 12 and a potting part arranged at the end of the filtering part 12 11, the sealing part 11 is fixedly connected to the tube wall 22 of the hollow tube 2, the filtering part 12 includes a plurality of axially extending and independently arranged hollow membrane fibers, a retaining cylinder 3 is provided in the inner cavity 21, one end of the retaining cylinder 3 radially extends into the sealing part 11 to form an embedding area 31, the retaining cylinder 3 is sleeved on the outside of the hollow membrane bundle 1 and is coaxially arranged with the hollow membrane bundle 1, the axis of the retaining cylinder 3 is away from the side outlet relative to the axis of the inner cavity 21 to form a flow area 4 between the outer wall of the retaining cylinder 3 and the side opening 24.
[0041] In the above technical solution, the hollow membrane bundle 1 is located in the retaining cylinder 3 and is coaxially arranged with the retaining cylinder 3, so that the hollow membrane bundle 1 is constrained in the retaining cylinder 3. When filtering the liquid, the retaining cylinder 3 can block and protect the hollow membrane filaments, limit the bending of the hollow membrane filaments, thereby protecting the hollow membrane filaments and increasing the service life of the hollow membrane filaments. When filtering the liquid, since a large amount of liquid is concentrated at the side outlet, it is easy to drive the membrane filaments here to bend toward the side opening 24 and cause the membrane filaments to be damaged. Therefore, the retaining cylinder 3 is set to deviate from the side opening 24 and form a circulation area 4. Since the position of the circulation area 4 corresponds to the side opening 24, and the space of the circulation area 4 is relatively large, the liquid can pass through here more smoothly, which improves the liquid flow rate, reduces the pressure raised by the liquid gathering here, and reduces the damage to the hollow membrane filaments. Figure 2 The X1 axis is the common axis of the retaining cylinder 3 and the hollow membrane bundle 1 , and the X2 axis is the axis of the inner cavity 21 .
[0042] Preferably, the distance between the axis of the retaining cylinder 3 and the axis of the inner cavity 21 is L1, the inner diameter of the hollow tube 2 is d1, and the ratio of L1 to d1 is in the range of 0.01-0.07. The extended line of the axis of the side opening 24 passes through the axis of the hollow membrane bundle 1, and the angle between the two is between 85-95°.
[0043] In the above technical solution, the larger the ratio of L1 to d1, the larger the relative size of the circulation area 4, the smoother the flow of the feed liquid, and the less likely the hollow membrane filament is to be damaged. However, the size of the side opposite to the circulation area 4 in the circulation space (named as the deviation area) will be smaller, which will affect the flow of the feed liquid in the deviation area. Therefore, it is necessary to set the ratio of L1 to d1 within the above range, which can not only meet the feed liquid flow rate on the side of the hollow membrane bundle 1 away from the circulation area 4, but also ensure the size of the circulation area 4. At the same time, the plane passing through the axis of the side outlet and the axis of the hollow membrane bundle 1 is the reference plane, and the side outlet 24 and the hollow membrane bundle 1 are both divided into two symmetrical parts by the reference plane. The feed liquid on both sides of the reference plane can flow to the side outlet or flow in from the side outlet evenly and symmetrically, which is conducive to ensuring that the hollow membrane bundle 1 is evenly stressed on both sides of the side opening 24 to avoid damage. The angle is controlled between 85-95° to avoid excessive tilting of the hollow membrane bundle 1 and affect the uniformity of the feed liquid flow process.
[0044] Preferably, the cross-sectional area of the side opening 24 is S1, the cross-sectional area of the inner cavity 21 is S0, the cross-sectional area of the range covered by the outer diameter of the retaining cylinder 3 is S2, and the ratio of S1 to (S0-S2) is in the range of 0.1-0.8. The radial wall thickness of the retaining cylinder 3 is L3, the outer diameter of the retaining cylinder 3 is D2, and the ratio of L3 to D2 is in the range of 0.01-0.5. The range covered by the outer diameter of the retaining cylinder 3 refers to all areas within the outer diameter of the retaining cylinder 3, including the cross-sectional area of the retaining cylinder 3 and the cross-sectional area of the hole on the retaining cylinder 3.
[0045] In the above technical solution, S0-S2 is the area of the gap between the retaining tube 3 and the tube wall 22. The larger the ratio of S1 to (S0-S2), the larger the size of the side opening 24 compared to the gap, and the larger the flow rate at the position of the side opening 24, which can increase the overall flow rate of the filter, but the flow rate of the liquid at the gap position will increase, resulting in an increase in the impact on the hollow membrane filaments, affecting the life of the hollow membrane filaments; the smaller the ratio of S1 to (S0-S2), the larger the size of the gap compared to the side opening 24, the slower the flow rate of the liquid in the gap, and the less likely the hollow membrane filaments are to be damaged, but the flow rate at the side opening 24 is relatively too small, which will affect the overall filtration efficiency. Therefore, it is necessary to set the ratio of S1 to (S0-S2) within the above range, which can not only ensure the overall flow rate of the filter, but also control the impact force on the hollow membrane filaments within a reasonable range. The larger the ratio of L3 to D2, the greater the relative thickness of the retaining tube 3 and the greater the strength. However, the thick retaining tube 3 will reduce the space in the inner cavity 21 that can be used for the liquid to flow, resulting in a decrease in the flow rate of the liquid. The smaller the ratio of L3 to D2, the smaller the space in the inner cavity 21 occupied by the retaining tube 3, the larger the space in the inner cavity 21 that can be used for the liquid to flow, and the greater the flow rate of the liquid. However, the reduced thickness of the retaining tube 3 will result in a decrease in the strength of the retaining tube 3. Therefore, it is necessary to control the ratio of L3 to D2 within the above range to increase the flow rate of the liquid while ensuring the strength of the retaining tube 3.
[0046] Preferably, the portion of the retaining cylinder 3 outside the potting portion 11 is a protection zone 32, and the embedded area 31 and the protection zone 32 are an integral structure. The radial projection of the protection zone 32 on the tube wall 22 covers the side opening 24. The axial distance between the end surface of the protection zone 32 away from the potting portion 11 and the side opening 24 is L2, the axial length of the filter portion 12 is L0, and the ratio of L2 to L0 is in the range of 0.02-0.08.
[0047] In the above technical solution, the corresponding positions of the side openings 24 on the retaining cylinder 3 are all within the protection zone 32. The protection zone 32 can effectively protect the hollow membrane fibers near the side openings 24, and the protection zones 32 are all located outside the potting portion 11, which can ensure that the side openings 24 are not blocked by the potting portion 11, thereby ensuring the flow efficiency of the side openings 24. The larger the ratio of L2 to L0, the better the protective effect of the baffle cylinder 3 on the filter section 12. However, if the baffle cylinder 3 is too long, the larger the space occupied in the inner cavity, the negative impact on the flow of slurry in the filter section 12 will be, which will cause the slurry flow rate in the filter section 12 to decrease; the smaller the ratio of L2 to L0, the smaller the space occupied in the inner cavity, the smaller the negative impact on the slurry flow rate in the filter section 12 will be, but it will cause the protective effect of the baffle cylinder 3 on the filter section 12 to decrease. Therefore, it is necessary to set the ratio of L2 to L0 within the above range, which can not only ensure the protective effect of the baffle cylinder 3 on the filter section 12, but also control the negative impact of the baffle cylinder 3 on the slurry flow rate in the filter section 12 within a reasonable range.
[0048] Preferably, a through hole 33 is provided at the position of the retaining cylinder 3 corresponding to the side opening 24, so as to allow the liquid in the retaining cylinder 3 to flow to the outside of the retaining cylinder 3 through the through hole 33. A plurality of connectors 5 are provided between the retaining cylinder 3 and the hollow tube 2. The plurality of connectors 5 are evenly arranged on the tube wall 22 in the circumferential direction. The connectors 5 are fixed to the tube wall 22. The surfaces of the plurality of connectors 5 in contact with the outer wall of the retaining cylinder 3 are on the same reference cylindrical surface. The axis of the reference cylindrical surface is coaxially arranged with the axis of the retaining cylinder 3. The ends of the connectors 5 abut against the outer wall of the retaining cylinder 3. The through holes 33 are also provided at other positions of the retaining cylinder 3. The through holes 33 in the embedding area 31 are filled with the potting material in the potting portion 11 to form a bridge portion.
[0049] In the above technical solution, the through hole 33 can connect the inner and outer sides of the retaining cylinder 3, thereby reducing the influence of the retaining cylinder 3 on the flow efficiency of the feed liquid. The multiple connectors 5 can position the retaining cylinder 3 during the assembly process of the hollow fiber filter, without the need for other positioning tools for positioning, simplifying the assembly process and improving the assembly efficiency. The multiple connectors 5 can also limit the retaining cylinder 3, further increase the stability and reliability of the retaining cylinder 3, reduce the risk of the retaining cylinder 3 falling off, and reduce the shaking amplitude of the retaining cylinder 3. The end of the connector 5 and the outer wall of the retaining cylinder 3 can be connected by interference fit, ultrasonic welding, or adhesive bonding. It can be understood that in another embodiment, the connector 5 can also be fixed on the outer wall of the retaining cylinder 3, and one end of the connector 5 abuts against the tube wall 22.
[0050] It can be understood that in one embodiment, two of the retaining cylinders 3 are provided in the inner cavity 21, and the two retaining cylinders 3 are relatively arranged at both ends of the hollow membrane bundle 1, wherein the axis of one of the retaining cylinders 3 is away from the side outlet relative to the axis of the inner cavity 21, and the axis of the other retaining cylinder 3 is at a distance of zero from the axis of the inner cavity 21.
[0051] In the above technical solution, only one end of the hollow membrane bundle 1 is relatively far away from the side outlet, and the other end remains in the center. When filtering, the side opening 24 of the center end of the hollow membrane bundle 1 is sealed. The centering of the hollow membrane bundle 1 can make the distance between the hollow membrane bundle 1 and the tube wall 22 basically the same in all directions, so that the liquid flows more evenly. The axis of the retaining cylinder 3 and the axis of the inner cavity 21 are zero, which can be understood as: the axis of the retaining cylinder 3 coincides with the axis of the inner cavity 21, and can also be understood as: the midpoint of the axis of the retaining cylinder 3 coincides with the midpoint of the axis of the inner cavity 21, and there can be a certain inclination angle between the axis of the retaining cylinder 3 and the axis of the inner cavity 21. Therefore, in this embodiment, the structure may be one: when the membrane filament material is easy to bend, the hollow membrane bundle 1 located between the two blocking cylinders 3 and not wrapped by the two blocking cylinders 3 deviates from the axis of the inner cavity 21. At this time, the axes of the two blocking cylinders 3 are parallel to the axis of the inner cavity 21, and the axis of the hollow membrane bundle 1 located between the two blocking cylinders 3 and not wrapped by the two blocking cylinders 3 is inclined to the axis of the inner cavity 21 (refer to Figure 4 ). Or in this embodiment, it can be structure 2: when the membrane material is difficult to bend, the axes of the two retaining cylinders 3 are slightly inclined relative to the axis of the inner cavity 21, and the axis of the hollow membrane bundle 1 coincides with the axis of the retaining cylinder 3 (refer to Figure 5 ).
[0052] It can be understood that in another embodiment, two retaining cylinders 3 are provided in the inner cavity 21, and the two retaining cylinders 3 are relatively arranged at the two ends of the hollow membrane bundle 1, and the axes of the two retaining cylinders 3 are both away from the side away from the side outlet relative to the axis of the inner cavity 21. The shapes and sizes of the two retaining cylinders 3 can be set to be the same or different according to actual needs.
[0053] In the above technical solution, the axes of the two retaining cylinders 3 are offset to the side away from the side outlet relative to the axis of the inner cavity 21, so that the hollow membrane bundle 1 as a whole can deviate to the side away from the side outlet. The two ends of the hollow membrane bundle 1 have the same structure, and there is no need to distinguish between the two ends during installation and use, which is convenient for installation and use.
Claims
1. A hollow fiber filter, 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 part and a potting part arranged at the end of the filter part, the potting part is fixed to the tube wall of the hollow tube, and the filter part comprises a plurality of axially extending and independently arranged hollow membrane fibers, wherein the filter part comprises a plurality of axially extending and independently arranged hollow membrane fibers, wherein the hollow membrane bundle comprises a plurality of axially extending and independently arranged hollow membrane fibers, and ... A retaining cylinder is provided in the inner cavity, one end of which radially extends into the potting portion to form an embedding area, the retaining cylinder is sleeved on the outside of the hollow membrane bundle and is coaxially arranged with the hollow membrane bundle, and the axis of the retaining cylinder is away from the side outlet relative to the axis of the inner cavity to form a flow area between the outer wall of the retaining cylinder and the side opening.
2. A hollow fiber filter according to claim 1, characterized in that: The distance between the axis of the retaining cylinder and the axis of the inner cavity is L1, the inner diameter of the hollow tube is d1, and the ratio range of L1 to d1 is: 0.01-0.
07.
3. A hollow fiber filter according to claim 2, characterized in that: Two retaining cylinders are arranged in the inner cavity, and the two retaining cylinders are relatively arranged at the two ends of the hollow membrane bundle, wherein the axis of one retaining cylinder is away from the side outlet relative to the axis of the inner cavity, and the axis of the other retaining cylinder is at a distance from the axis of the inner cavity; or, two retaining cylinders are arranged in the inner cavity, and the two retaining cylinders are relatively arranged at the two ends of the hollow membrane bundle, and the axes of the two retaining cylinders are away from the side outlet relative to the axis of the inner cavity.
4. A hollow fiber filter according to claim 1, characterized in that: The cross-sectional area of the side opening is S1, the cross-sectional area of the inner cavity is S0, the cross-sectional area of the range covered by the outer diameter of the retaining cylinder is S2, and the ratio range of S1 to (S0-S2) is: 0.1-0.
8.
5. A hollow fiber filter according to claim 1, characterized in that: The extended line of the axis of the side opening passes through the axis of the hollow membrane bundle, and the angle between the two is between 85-95°.
6. A hollow fiber filter according to claim 1, characterized in that: The portion of the retaining cylinder outside the potting portion is a protection zone, and the radial projection of the protection zone on the tube wall covers the side opening.
7. A hollow fiber filter according to claim 6, characterized in that: The axial distance between the end surface of the protection zone away from one end of the potting portion and the side opening is L2, the axial length of the filter portion is L0, and the ratio of L2 to L0 is in the range of 0.02-0.
08.
8. The hollow fiber filter according to claim 1, characterized in that: The radial wall thickness of the retaining cylinder is L3, the outer diameter of the retaining cylinder is D2, and the ratio of L3 to D2 is in the range of 0.01-0.
5.
9. A hollow fiber filter according to claim 1, characterized in that: A through hole is provided at a position of the retaining cylinder corresponding to the side opening, so as to allow the liquid in the retaining cylinder to flow to the outside of the retaining cylinder through the through hole.
10. The hollow fiber filter according to claim 1, characterized in that: A connecting piece is provided between the retaining tube and the hollow tube, the connecting piece is fixed to the tube wall, and an end of the connecting piece abuts against the outer side wall of the retaining tube.
11. A hollow fiber filter according to claim 10, characterized in that: There are multiple connectors, which are circumferentially spaced on the tube wall. The surfaces of the multiple connectors in contact with the outer wall of the retaining tube are on the same reference cylindrical surface, and the axis of the reference cylindrical surface is coaxially arranged with the axis of the retaining tube.