Hollow fiber filtering device

Abstract

The utility model discloses a hollow fiber filtering device, which comprises a hollow membrane bundle and a hollow pipe, the hollow pipe comprises an inner cavity, a pipe wall surrounding the inner cavity, a port and a side opening arranged on the pipe wall, the hollow membrane bundle is arranged in the inner cavity, the hollow membrane bundle comprises a filtering part and a filling and sealing part arranged at the end part of the filtering part, the filtering part comprises a plurality of hollow membrane filaments which axially extend and are independently arranged, a fixing plate is arranged at an opening in the corresponding side of the inner cavity, a partition plate is embedded in the filling and sealing part so as to divide the hollow membrane bundle into a plurality of small hollow membrane bundles, and the partition plate abuts against the ends, close to each other, of the fixing plate. According to the scheme, the partition plates abut against the ends, close to each other, of the fixing plates, the positions of the partition plates are limited in the axial direction, the position deviation of the partition plates can be reduced, and therefore the distribution density of the packaged hollow membrane filaments is more uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering equipment, in particular to a hollow fiber filtering device. 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 hollow membrane bundle of a large hollow fiber membrane assembly usually contains a large number of hollow membrane fibers, which makes it difficult for the potting material to fully penetrate between the hollow membrane fibers during the potting process of the potting part. At the same time, a large number of hollow membrane fibers are prone to offset during the packaging process, resulting in uneven density of the hollow membrane fibers. Therefore, the membrane fibers are generally separated into multiple bundles by adding a partition plate to achieve uniformity of the membrane fibers inside the small bundle.

[0004] However, during the potting process of the hollow membrane bundle, the partition plate is easily impacted by the potting material and shifts in position, thereby causing the hollow membrane bundle to shift as a whole, which affects the distribution uniformity of the hollow membrane fibers after potting to a certain extent. Utility Model Content

[0005] In order to overcome the disadvantage that a large number of hollow membrane fibers in the existing large hollow fiber membrane components are easily offset during the packaging process, resulting in uneven density of the hollow membrane fibers, the utility model provides a hollow fiber filtering device that can improve the distribution uniformity of the hollow membrane fibers in the hollow membrane bundle.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A hollow fiber filtration device 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 filtering part comprises a plurality of axially extending and independently arranged hollow membrane filaments, a fixing plate is arranged at the corresponding side opening of the inner cavity, a partition plate is embedded in the potting part to separate the hollow membrane bundle into a plurality of small hollow membrane bundles, and the partition plate abuts against one end of the fixing plate that is close to each other.

[0008] When filtering the feed liquid, the hollow fiber filtration device can adopt an internal pressure filtration mode or an external pressure filtration mode. The internal pressure filtration 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 filtration 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, enters the inner cavity to form a filtrate, and then discharges through the side opening, and the residual liquid is blocked in the hollow membrane fiber cavity and 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.

[0009] In the above technical scheme, by embedding a partition plate in the potting part, the whole bundle of hollow membranes can be divided into multiple bundles of hollow membranes, which is beneficial to improve the distribution uniformity of the hollow membrane fibers in the hollow membrane bundle; wherein, the partition plate can be formed in one piece or formed by splicing multiple parts. In the process of potting the hollow membrane bundle, as the feed pressure of the potting material at both ends increases, the potting material will collide with the hollow membrane fibers, which may easily cause the position of the partition plate to shift, thereby affecting the density of the hollow membrane fibers. Therefore, this scheme makes the end of the partition plate close to the fixed plate abut against each other, and limits the position of the partition plate in the axial direction, which is beneficial to reduce the position shift of the partition plate, so that the distribution density of the hollow membrane fibers after encapsulation is more uniform. The abutment of the end of the partition plate close to the fixed plate can be a direct abutment of the end faces of the two, or the two can be abutted by plugging.

[0010] Preferably, an embedding groove is provided on the end surface of the partition plate close to one end of the fixed plate, and one end of the fixed plate is adapted to and embedded in the embedding groove; an embedding groove is provided on the end surface of the fixed plate close to one end of the partition plate, and one end of the partition plate is adapted to and embedded in the embedding groove.

[0011] In the above technical solution, the fixing plate and the partition plate are inserted and embedded by providing an embedding groove, so that the connection between the two is more stable and it is not easy to cause relative displacement in the radial direction or circumferential direction.

[0012] Preferably, one end of the partition plate radially away from the axis of the hollow membrane bundle extends toward the tube wall and abuts against the tube wall.

[0013] The above technical scheme, through the abutment between the partition plate and the tube wall, that is, the abutment between the partition plate and the tube wall can include direct abutment (that is, the outer edge of the partition plate directly fits the inner surface of the tube wall) or indirect abutment (that is, a gap is left between the outer edge of the partition plate and the inner surface of the tube wall, and other components are arranged in the gap to realize the abutment between the outer edge of the partition plate and the inner surface of the tube wall). The partition plate can be radially limited by the tube wall, which is beneficial to reduce the position deviation of the partition plate during the encapsulation process of the hollow membrane bundle, thereby making the distribution density of the encapsulated hollow membrane fibers more uniform.

[0014] Preferably, the partition plate comprises a partition body and an elastic member sleeved on the outer edge of the partition body, a receiving groove is provided on the outer edge of the partition body close to the tube wall, and at least part of the structure of the elastic member is arranged in the receiving groove.

[0015] In the above technical solution, the receiving groove can be an annular groove formed on the outer edge of the partition body; or the receiving groove passes through the end face of the partition body away from the filter part along the axial direction of the hollow tube to form an open groove, and the receiving groove can accommodate the elastic member to prevent the elastic member from falling, so that the elastic member can play a role in binding the hollow membrane filaments. The ends of the hollow membrane filaments are bound inwardly into a whole bundle of hollow membrane bundles by the elastic member, so as to prevent the hollow membrane filaments from diverging to the surroundings during the potting process, and the distribution density of the ends of the encapsulated hollow membrane filaments can be made more uniform, so that the axis of a single hollow membrane filament is also parallel to the axis of the hollow tube as much as possible, so as to avoid the part of the single hollow membrane filament located in the potting part being too misaligned with the part located in the filter part due to divergence, thereby causing the hollow membrane filament to break.

[0016] Preferably, the end of the partition plate abutting against the fixed plate is the abutting end, the end of the partition plate away from the fixed plate is the away end, and the distance between the accommodating groove and the away end is smaller than the distance between the accommodating groove and the abutting end.

[0017] In the above technical solution, the distance between the accommodating groove and the distal end is smaller than the distance between the accommodating groove and the abutting end, so that the elastic member is relatively closer to the distal end, that is, the elastic member is closer to the end of the hollow membrane fiber, and the elastic member has a better restraining effect on the end of the hollow membrane fiber.

[0018] Preferably, the distance between the accommodating groove and the distal end is greater than zero.

[0019] In the above technical solution, the distance between the accommodating groove and the distal end is greater than zero, so as to avoid the accommodating groove being located at the distal end to form an open groove, that is, the accommodating groove is only arranged in the annular groove formed by the outer edge of the partition body, which is helpful to prevent the elastic member from falling off from the accommodating groove.

[0020] Preferably, the partition plate has a tapered portion at one end close to the fixed plate, and the width of the tapered portion decreases from the end away from the fixed plate to the end close to the fixed plate.

[0021] In the above technical solution, the width of the conical portion decreases from the end away from the fixed plate to the end close to the fixed plate, which can make it easier to insert the partition plate into the hollow membrane bundle, and easily separate the hollow membrane bundle into multiple hollow membrane bundles, thereby achieving the uniformity of the hollow membrane fibers; and because the width of the conical portion decreases from the end away from the fixed plate to the end close to the fixed plate, the width of the gaps between the hollow membrane bundles, especially the gaps formed in the filter portion, can have a transitional change along its axial direction, thereby avoiding damage to the hollow membrane fibers due to bending at the gap position.

[0022] Preferably, the cross-sectional area of ​​the partition plate in the encapsulation area is S1, the cross-sectional area of ​​the encapsulation area is S2, and the ratio of S1 to S2 is in the range of 0.02-0.1.

[0023] In the above technical solution, the larger the ratio of S1 to S2, the better the dividing effect of the partition plate on the hollow membrane filaments, the higher the strength of the partition plate itself, the less likely the partition plate is to deform, and the stronger the stability. At the same time, the large surface area of ​​the partition plate also increases the connection area between the potting part, thereby improving the stability of the connection between the partition plate and the potting part; however, since the partition plate occupies a large space, the number of hollow membrane filaments will be reduced, and the distance between the hollow membrane filaments is too large, which increases the distance between the hollow membrane bundles, making the hollow membrane filaments unevenly distributed overall; the smaller the ratio of S1 to S2, the smaller the space occupied by the partition plate, the more hollow membrane filaments can be increased, and the small distance between the hollow membrane filaments will make the hollow membrane filaments more evenly distributed overall, but the strength of the partition plate itself will decrease, and the partition plate is prone to deformation, resulting in a decrease in the dividing effect. Therefore, it is necessary to set the ratio of S1 to S2 within the above range, which can not only ensure the strength and dividing effect of the partition plate, but also ensure the number of hollow membrane filaments, and make the hollow membrane filaments more evenly distributed overall.

[0024] Preferably, the potting portion includes a connecting area and a fixing area surrounded outside the connecting area, the fixing area is used to fix the connecting area to the tube wall of the hollow tube, and the outer edge of the partition plate extends into the fixing area in a radial direction toward the tube wall.

[0025] In the above technical solution, the partition plate can allow the potting material in the fixed area to flow into the communication area along the gap of the partition plate during potting, ensuring that the communication area can be fully filled with the potting material.

[0026] Preferably, one end of the partition plate close to the filtering portion is arranged in the potting portion.

[0027] In the above technical solution, the position where the partition plate is set in the hollow membrane bundle will separate the hollow membrane bundle. At the position where the partition plate disappears, the small bundles of hollow membranes will move closer to each other and fill the position originally occupied by the partition plate. Since the end of the partition plate close to the filter part is arranged in the potting part, the mutation position is also at least partially arranged in the potting part, which can reduce the uneven distribution of hollow membrane fibers in the filter part.

[0028] Preferably, one end of the partition plate close to the filtering portion extends out of the potting portion, and forms a membrane bundle gap in the hollow membrane bundle extending along the axial direction of the hollow tube.

[0029] In the above technical solution, the membrane bundle gap will extend a certain distance in the axial direction and then be gradually filled with hollow membrane fibers. The membrane bundle gap can allow the feed liquid near the center of the hollow membrane bundle to flow out of the hollow membrane bundle more smoothly, thereby increasing the circulation effect of the feed liquid.

[0030] Preferably, the axial length of the potting portion along the hollow tube is L1, the axial length of the partition plate along the hollow tube is L2, and the ratio of L1 to L2 is in the range of 1.2-2.8.

[0031] In the above technical solution, the larger the ratio of L1 to L2, the smaller the dimension of the partition plate extending into the potting part, which will lead to a decrease in the connection stability between the partition plate and the potting part, and the axial extension distance of the partition plate to the hollow membrane bundle is too small, resulting in a decrease in the effect of dividing the hollow membrane bundle into small bundles; the smaller the ratio of L1 to L2, the better the effect of the partition plate on dividing the potting part into small bundles, that is, the axial extension dimension of the partition plate in the potting part is too large, resulting in a decrease in the overall strength of the potting part. Therefore, it is necessary to set the ratio of L1 to L2 within the above range, which can ensure both the effect of the partition plate on dividing the hollow membrane bundle and the overall strength of the potting part.

[0032] Preferably, the partition plate comprises a center line coinciding with the axis of the hollow membrane bundle, and a plurality of partition plate bodies extending radially around the center line.

[0033] In the above technical solution, the center line of the partition plate coincides with the axis of the hollow membrane bundle, which can ensure that the number of hollow membrane fibers in each hollow membrane bundle after being separated is substantially the same.

[0034] Preferably, the expansion coefficient of the hollow tube is A, the expansion coefficient of the potting portion is B, the expansion coefficient of the partition plate is C, the ratio of B to A is ≤200, and / or the ratio of C to A is ≤200.

[0035] In the above technical solution, the expansion coefficient of the potting part refers to the expansion coefficient of the potting material that bonds multiple hollow membrane fibers together, and does not include the expansion coefficient of the hollow membrane fibers; the hollow fiber filter device is generally set with an applicable range of feed liquid temperature. If the difference in the expansion coefficients of each part is too large, when filtering feed liquids of different temperatures, the various parts will separate under the action of thermal expansion and contraction, affecting the normal use of the hollow fiber filter device. In order to enable the hollow fiber filter device to be used normally within a certain temperature range, it is necessary to control the expansion coefficients of each part to the ratio of B to A ≤200, and / or the ratio of C to A ≤200, so as to ensure the normal use of the hollow fiber filter device.

[0036] The beneficial effects of the utility model are: (1) the ends of the partition plate and the fixed plate that are close to each other are abutted against each other, and the position of the partition plate is limited in the axial direction, which is beneficial to reduce the position deviation of the partition plate, thereby making the distribution density of the hollow membrane filaments after encapsulation more uniform; (2) the elastic member can play a role in restraining the hollow membrane filaments, and can restrain the ends of the hollow membrane filaments inward into a whole bundle of hollow membranes to prevent the hollow membrane filaments from diverging to the surroundings during the encapsulation process, and can also make the distribution density of the ends of the hollow membrane filaments after encapsulation more uniform, so that the axis of a single hollow membrane filament is also as parallel as possible to the axis of the hollow tube, avoiding the portion of a single hollow membrane filament located in the encapsulation part from being too misaligned with the portion located in the filtration part due to divergence, thereby causing the membrane filament to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 (Internal pressure filtration mode);

[0038] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0039] Figure 3 This is a schematic diagram of the structure of the fixed plate and the partition plate in the utility model. Figure 1 ;

[0040] Figure 4 It is a structural schematic diagram of the fixed plate in the utility model;

[0041] Figure 5 It is a structural schematic diagram of the partition plate in the utility model;

[0042] Figure 6 This is a schematic diagram of the structure of the fixed plate and the partition plate in the utility model. Figure 2;

[0043] Figure 7 This is a schematic diagram of the structure of the utility model Figure 2 (External pressure filtration mode).

[0044] In the figure: hollow membrane bundle 1, filtering part 11, potting part 12, connecting area 121, fixing area 122, hollow tube 2, inner cavity 21, tube wall 22, port 23, side opening 24, fixing plate 3, partition plate 4, partition body 41, elastic member 42, accommodating groove 43, embedding groove 5, hollow end cap 6. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] Embodiment 1:

[0047] like Figures 1 to 7 As shown, a hollow fiber filtration device 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 filtering part 11 and a potting part 12 arranged at the end of the filtering part 11, the filtering part 11 comprises a plurality of axially extending and independently arranged hollow membrane filaments, a fixing plate 3 is arranged at the side opening 24 of the inner cavity 21, a partition plate 4 is embedded in the potting part 12 to separate the hollow membrane bundle 1 into a plurality of hollow membrane small bundles, and the partition plate 4 abuts against one end of the fixing plate 3 close to each other; wherein the partition plate 4 can be formed as one piece or formed by splicing a plurality of parts. The fixing plate 3 is a cylindrical structure, the axial direction of the fixing plate 3 of the cylindrical structure coincides with the axis of the hollow membrane bundle 1, the fixing plate 3 of the cylindrical structure is sleeved on the outside of the hollow membrane bundle 1, and the fixing plate 3 is provided with a plurality of through holes.

[0048] The above technical solution can separate the whole bundle of hollow membrane bundle 1 into multiple bundles of hollow membrane small bundles by embedding the partition plate 4 in the potting part 12, which is beneficial to improve the distribution uniformity of the hollow membrane filaments in the hollow membrane bundle 1. In the process of potting the hollow membrane bundle 1, as the feed pressure of the potting material at both ends increases, the potting material will collide with the hollow membrane filaments, which may easily cause the position shift of the partition plate 4, thereby affecting the density of the hollow membrane filaments. Therefore, the present solution makes the partition plate 4 abut against one end close to the fixed plate 3, and limits the position of the partition plate 4 in the axial direction, which is beneficial to reduce the position shift of the partition plate 4, so that the distribution density of the hollow membrane filaments after encapsulation is more uniform. The abutment of the partition plate 4 and the fixed plate 3 at one end close to each other can be a direct abutment of the end faces of the two, or abutment of the end portions after the two are plugged in.

[0049] Preferably, one end of the partition body 41 away from the center line extends toward the tube wall 22 and abuts against the tube wall 22 .

[0050] The above technical scheme, through the partition plate 4 abutting against the tube wall 22, that is, the abutment between the partition plate 4 and the tube wall 22 can include direct abutment (that is, the outer edge of the partition plate 4 directly fits the inner surface of the tube wall 22) or indirect abutment (that is, a gap is left between the outer edge of the partition plate 4 and the inner surface of the tube wall 22, and other components are arranged in the gap to realize the abutment between the outer edge of the partition plate 4 and the inner surface of the tube wall 22). The partition plate 4 can be radially limited by the tube wall 22, which is beneficial to reduce the position deviation of the partition plate 4 during the encapsulation process of the hollow membrane bundle, thereby making the distribution density of the encapsulated hollow membrane fibers more uniform.

[0051] Preferably, the partition plate 4 includes a center line coinciding with the axis of the hollow membrane bundle 1, a plurality of partition bodies 41 radiating around the center line, and an elastic member 42 sleeved on the outer edge of the partition body 41; at the same time, the partition body 41 is provided with a receiving groove 43 on the outer side surface close to the tube wall 22, and part or all of the structure of the elastic member 42 is arranged in the receiving groove 43, and the receiving groove 43 can be an annular groove formed on the outer edge of the partition body 41; or the receiving groove 43 passes through the end surface of the partition body 41 away from the filter part 11 along the axial direction of the hollow tube 2 to form an open groove, and the receiving groove 43 can accommodate the elastic member 42 to prevent the elastic member 42 from falling, so that the elastic member 42 can play a role in restraining the hollow membrane filaments, and the ends of the hollow membrane filaments are restrained inwardly into a whole bundle of hollow membrane bundles through the elastic member 42. The ends of the hollow membrane fibers are bound inwardly into a whole hollow membrane bundle 1 by the elastic member 42, so as to prevent the hollow membrane fibers from diverging in all directions during the potting process. The distribution density of the ends of the hollow membrane fibers after encapsulation can also be made more uniform, so that the axis of a single hollow membrane fiber is as parallel as possible to the axis of the hollow tube 2, so as to prevent the portion of a single hollow membrane fiber located in the potting portion 12 from being too misaligned with the portion located in the filtration portion 11 due to divergence, thereby causing the membrane fiber to break.

[0052] Preferably, the end of the partition plate 4 abutting against the fixed plate 3 is the abutting end, the end of the partition plate 4 away from the fixed plate 3 is the away end, and the distance between the accommodating groove 43 and the away end is smaller than the distance between the accommodating groove 43 and the abutting end. Further preferably, the distance between the accommodating groove 43 and the away end is greater than zero.

[0053] In the above technical solution, the distance between the receiving groove 43 and the remote end is smaller than the distance between the receiving groove 43 and the abutting end, so that the elastic member 42 is relatively closer to the remote end, that is, the elastic member 42 is closer to the end of the hollow membrane filament, and the elastic member 42 has a better binding effect on the end of the hollow membrane filament. Further preferably, the distance between the receiving groove 43 and the remote end is greater than zero, so as to avoid the receiving groove 43 being located at the remote end to form an open groove, that is, the receiving groove 42 is only provided in the annular groove formed by the outer edge of the partition body 41, which is conducive to preventing the elastic member 42 from falling off from the receiving groove 43.

[0054] Preferably, the partition plate 4 has a tapered portion 44 at one end close to the fixed plate 3 , and the width of the tapered portion 44 decreases from the end away from the fixed plate 3 to the end close to the fixed plate 3 .

[0055] In the above technical scheme, the width of the conical portion 44 decreases from the end far away from the fixed plate 3 to the end close to the fixed plate 3, which can make it easier for the partition plate 4 to be inserted into the hollow membrane bundle 1, and it is easy to separate the hollow membrane bundle 1 into multiple hollow membrane bundles, thereby achieving the uniformity of the hollow membrane fibers; and because the width of the conical portion 44 decreases from the end far away from the fixed plate 3 to the end close to the fixed plate 3, the width of the gap between the hollow membrane bundles, especially the gap formed in the filter portion 11, can be transitional along its axial change, thereby avoiding the hollow membrane fibers from being damaged due to bending at the gap position.

[0056] Preferably, the axial length of the potting portion 12 along the hollow tube 2 is L1, the axial length of the partition plate 4 along the hollow tube 2 is L2, and the ratio of L1 to L2 is in the range of 1.2-2.8.

[0057] In the above technical solution, the larger the ratio of L1 to L2, the smaller the dimension of the partition plate 4 extending into the potting part 12, which will cause the connection stability between the partition plate 4 and the potting part 12 to decrease, and the axial extension distance of the partition plate 4 to the hollow membrane bundle 1 is too small, resulting in a decrease in the effect of dividing the hollow membrane bundle 1 into small bundles; the smaller the ratio of L1 to L2, the better the effect of the partition plate 4 on dividing the potting part 12 into small bundles, that is, the axial extension dimension of the partition plate 4 in the potting part 12 is too large, resulting in a decrease in the overall strength of the potting part 12. Therefore, it is necessary to set the ratio of L1 to L2 within the above range, which can ensure both the dividing effect of the partition plate 4 on the hollow membrane bundle 1 and the overall strength of the potting part 12.

[0058] Preferably, the potting portion 12 includes a communication area 121 and a fixed area 122 arranged outside the communication area 121, the fixed area 122 is formed by curing the potting material, and the fixed area 122 is used to fix the communication area 121 to the tube wall 22 of the hollow tube 2, and the outer edge of the partition plate 4 extends into the fixed area 122 along the radial direction close to the tube wall 22. The cross-sectional area of ​​the partition plate 4 in the communication area 121 is S1, and the cross-sectional area of ​​the communication area 121 is S2, and the ratio of S1 to S2 is in the range of 0.02-0.1.

[0059] In the above technical scheme, the larger the ratio of S1 to S2, the better the dividing effect of the partition plate 4 on the hollow membrane filaments, the higher the strength of the partition plate 4 itself, the less likely the partition plate 4 is to deform, and the stronger the stability. At the same time, the large surface area of ​​the partition plate 4 also increases the connection area with the potting part 12, thereby improving the stability of the connection between the partition plate 4 and the potting part 12; however, since the partition plate 4 occupies a larger space, the number of hollow membrane filaments will be reduced, and the distance between the hollow membrane filaments is too large, which increases the distance between the hollow membrane bundles, and makes the hollow membrane filaments unevenly distributed as a whole; the smaller the ratio of S1 to S2, the smaller the space occupied by the partition plate 4, the number of hollow membrane filaments can be increased, and the distance between the hollow membrane filaments is small, which makes the hollow membrane filaments more evenly distributed as a whole, but reduces the strength of the partition plate 4 itself, and the partition plate 4 is prone to deformation, resulting in a decrease in the dividing effect. Therefore, it is necessary to set the ratio of S1 to S2 within the above range, which can ensure the strength and segmentation effect of the partition plate 4, as well as the number of hollow membrane fibers, and make the hollow membrane fibers more evenly distributed overall. The partition plate 4 can allow the potting material in the fixed area 122 to flow into the communication area 121 along the gap of the partition plate 4 during potting, ensuring that the communication area 121 can be fully filled with the potting material.

[0060] Preferably, the expansion coefficient of the hollow tube 2 is A, the expansion coefficient of the fixed area 122 is B, the expansion coefficient of the partition plate 4 is C, the ratio of B to A is ≤200, and / or the ratio of C to A is ≤200. Hollow fiber filter devices are generally set with an applicable range of feed liquid temperature. If the difference in the expansion coefficients of each part is too large, when filtering feed liquids of different temperatures, gaps will appear in each part due to thermal expansion and contraction. In order to enable the hollow fiber filter device to be used normally within a certain temperature range, the expansion coefficient of each part needs to be controlled within the above range to ensure the normal use of the hollow fiber filter device.

[0061] It is understandable that, in one embodiment, Figure 5As shown, an embedding groove 5 is provided on the end surface of the partition plate 4 close to one end of the fixed plate 3, and one end of the fixed plate 3 is adapted to and embedded in the embedding groove 5. In the above technical solution, the fixed plate 3 and the partition plate 4 are inserted and embedded by providing the embedding groove 5, so that the connection between the two is more stable and it is not easy to cause relative displacement in the radial or circumferential direction. The embedding groove 5 can be provided on the fixed plate 3, or it can be not provided.

[0062] It can be understood that in another embodiment, Figure 4 As shown, an embedding groove 5 is provided on the end surface of the fixing plate 3 close to one end of the partition plate 4, and one end of the partition plate 4 is adapted to and embedded in the embedding groove 5. In the above technical solution, the fixing plate 3 and the partition plate 4 are inserted and embedded by providing the embedding groove 5, so that the connection between the two is more stable and it is not easy to cause relative displacement in the radial direction or circumferential direction. The embedding groove 5 may be provided on the partition plate 4, or it may not be provided.

[0063] It can be understood that, in one embodiment, one end of the partition plate 4 close to the filter part 11 is arranged in the potting part 11. The position where the partition plate 4 is arranged in the hollow membrane bundle 1 will separate the hollow membrane bundle 1. At the position where the partition plate 4 disappears, the small hollow membrane bundles will move closer to each other to fill the position originally occupied by the partition plate 4. Since one end of the partition plate 4 close to the filter part 11 is arranged in the potting part 12, the mutation position is also at least partially arranged in the potting part 12, which can reduce the uneven distribution of the hollow membrane fibers in the filter part 11.

[0064] It can be understood that in another embodiment, one end of the partition plate 4 close to the filter part 11 extends out of the potting part 12, and a membrane bundle gap extending along the axial direction of the hollow tube 2 is formed in the hollow membrane bundle 1. In the above technical solution, the membrane bundle gap will extend a certain distance in the axial direction and then be gradually filled with hollow membrane fibers. The membrane bundle gap can make the feed liquid near the center of the hollow membrane bundle 1 flow out of the hollow membrane bundle 1 more smoothly, thereby increasing the circulation effect of the feed liquid.

Claims

1. A hollow fiber filtration device, 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, wherein the filter part comprises a plurality of axially extending and independently arranged hollow membrane fibers, wherein: A fixing plate is arranged at the opening of the corresponding side of the inner cavity, and a partition plate is embedded in the potting part to separate the hollow membrane bundle into a plurality of small hollow membrane bundles, and the partition plate and the fixing plate are butted at one end close to each other.

2. A hollow fiber filtration device according to claim 1, characterized in that: An embedding groove is provided on the end surface of the partition plate close to one end of the fixed plate, and one end of the fixed plate is adapted to and embedded in the embedding groove; an embedding groove is provided on the end surface of the fixed plate close to one end of the partition plate, and one end of the partition plate is adapted to and embedded in the embedding groove.

3. A hollow fiber filtration device according to claim 1, characterized in that: One end of the partition plate which is away from the axis of the hollow membrane bundle in the radial direction extends toward the tube wall and abuts against the tube wall.

4. A hollow fiber filtration device according to claim 3, characterized in that: The partition plate comprises a partition body and an elastic member sleeved on the outer edge of the partition body. The outer edge of the partition body close to the tube wall is provided with a receiving groove, and at least part of the structure of the elastic member is arranged in the receiving groove.

5. A hollow fiber filtration device according to claim 4, characterized in that: The end of the partition plate abutting against the fixed plate is an abutting end, the end of the partition plate away from the fixed plate is a away end, and the distance between the accommodating groove and the away end is smaller than the distance between the accommodating groove and the abutting end.

6. A hollow fiber filtration device according to claim 5, characterized in that: The distance between the accommodating groove and the distal end is greater than zero.

7. The hollow fiber filtration device according to claim 1, characterized in that: The partition plate has a tapered portion at one end close to the fixed plate, and the width of the tapered portion decreases from the end away from the fixed plate to the end close to the fixed plate.

8. The hollow fiber filtration device according to claim 1, characterized in that: The cross-sectional area of ​​the partition plate in the encapsulation area is S1, the cross-sectional area of ​​the encapsulation area is S2, and the ratio of S1 to S2 is in the range of 0.02-0.

1.

9. A hollow fiber filtration device according to claim 8, characterized in that: The potting portion includes a communication area and a fixing area surrounded outside the communication area, the fixing area is used to fix the communication area to the tube wall of the hollow tube, and the outer edge of the partition plate extends into the fixing area along the radial direction toward the tube wall.

10. The hollow fiber filtration device according to claim 1, characterized in that: One end of the partition plate close to the filtering part is arranged in the potting part.

11. The hollow fiber filtration device according to claim 1, characterized in that: One end of the partition plate close to the filtering part extends out of the potting part, and forms a membrane bundle gap extending along the axial direction of the hollow tube in the hollow membrane bundle.

12. The hollow fiber filtration device according to claim 1, characterized in that: The axial length of the potting portion along the hollow tube is L1, the axial length of the partition plate along the hollow tube is L2, and the ratio of L1 to L2 is in the range of 1.2-2.

8.

13. The hollow fiber filtration device according to claim 1, characterized in that: The partition plate comprises a center line coincident with the axis of the hollow membrane bundle, and a plurality of partition plate bodies radiating around the center line.

14. The hollow fiber filtration device according to claim 9, characterized in that: The expansion coefficient of the hollow tube is A, the expansion coefficient of the potting portion is B, the expansion coefficient of the partition plate is C, the ratio of B to A is ≤200, and / or the ratio of C to A is ≤200.

Images