Hollow fiber assembly

Abstract

The utility model discloses a hollow fiber assembly which comprises a container, a hollow fiber membrane bundle axially arranged in the container, and a first inner core for fixing one end of the hollow fiber membrane bundle in the container, the hollow fiber membrane bundle comprises a plurality of hollow fiber membrane filaments as well as a first filling and sealing part and a second filling and sealing part which are positioned at two axial ends of the hollow fiber membrane bundle, the first filling and sealing part and the first inner core correspond to a liquid inlet of the container, and the first filling and sealing part comprises a bonding section bonded with the inner wall of the first inner core and a protection section positioned on the axial outer side of the first inner core; the protection section is relatively close to the liquid inlet, and the bonding section and the protection section are of an integrated structure. The protection section enables the boundary of the first filling and sealing part and the first inner core not to be located at the axial tail end of the first filling and sealing part any more, and the boundary is prevented from being directly impacted by inlet liquid entering from the liquid inlet. The protection section increases the axial length and mechanical strength of the first filling and sealing part, can cope with larger impact force of inlet liquid, and ensures stable and tight connection between the first filling and sealing part and the first inner core.

Description

Technical Field

[0001] The utility model relates to the technical field of filter materials, in particular to a hollow fiber component. Background Art

[0002] Chinese utility model patent CN220779741U provides an external pressure type hollow fiber membrane assembly, in which multiple hollow fiber membrane fibers corresponding to the first potting part of the liquid supply end are bonded to each other and the ports of the hollow fiber membrane fibers are closed. It also has a stabilizing part, which extends along the circumference of the hollow fiber membrane bundle and at least surrounds the boundary between the first potting part and the filtration part to form a limiting fixation for at least part of the hollow fiber membrane bundle.

[0003] The first potting part is bonded to the inner wall of one end of the stabilizing part, and the outer wall of the other end of the stabilizing part is clamped to the container, that is, the first potting part is fixed to the inner wall of the liquid supply end of the container through the stabilizing part.

[0004] The specific process of bonding and fixing the first potting part to the inner wall of one end of the stabilizing part and the membrane bundle is as follows: the end of the stabilizing part facing away from the supply liquid inlet is first clamped and fixed with the container, one end of the membrane bundle is inserted into the stabilizing part, and then the first potting part is formed by centrifugal glue pouring to bond the membrane filaments. At the same time, the first potting part is also bonded to the inner wall of the stabilizing part, and the end of the first potting part facing the supply liquid inlet is flush with the end of the stabilizing part facing the supply liquid inlet.

[0005] The hollow fiber membrane module is usually positioned with the feed liquid inlet facing downward and the filtrate outlet facing upward when in use. Accordingly, the first potting part faces downward and the second potting part faces upward. Since the first potting part and the stabilizing part are close to the feed liquid inlet and face the feed liquid inlet, the flow rate of the feed liquid is generally large when the external pressure hollow fiber module is treating the feed liquid, usually around 10m 3 / hr or more, after the supply liquid with a large flow rate flows in from the supply liquid inlet, it directly rushes towards the end face of the first potting part and the stabilizing part facing the supply liquid inlet, and the boundary between the end faces of the first potting part and the stabilizing part facing the supply liquid inlet is subjected to a continuous and high-intensity flow impact, so that the first potting part and the stabilizing part begin to crack at the boundary of the end face, and once the cracks at the end face are formed, they will extend axially inward until the outer wall of the first potting part and the inner wall of the stabilizing part are completely detached, thereby causing the stabilizing part to fail to support and hold up the first potting part, resulting in the weight of the entire membrane bundle being completely borne by the second potting part, which is equivalent to the entire membrane bundle being hung on the second potting part. Under the impact of the incoming liquid, the membrane bundle will shake relative to the second potting part, and it is easy to cause damage to the boundary between the membrane filament and the second potting part. The second potting part is overloaded and may also crack against the inner wall of the container.

[0006] Therefore, it is necessary to further improve the structure of the first potting part and the stabilizing part to solve the problem of cracking at the boundary between the end faces of the two facing the inlet, thereby avoiding the first potting part and the stabilizing part from detaching, ensuring the bonding integrity between the two, and preventing the membrane bundle from shaking relative to the second potting part, thereby protecting the membrane filaments. Utility Model Content

[0007] In view of the deficiencies in the prior art, the present invention aims to provide a hollow fiber assembly that solves the problem that the potting portion of the hollow fiber membrane bundle at the liquid inlet in the existing hollow fiber assembly is easily separated from the stabilizing portion.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A hollow fiber module comprising:

[0010] A hollow fiber membrane bundle comprises a plurality of hollow fiber membrane threads and a first potting portion and a second potting portion located at both axial ends of the hollow fiber membrane bundle, wherein the first potting portion is bonded to the first ends of the plurality of hollow fiber membrane threads and closes the ports of the first ends of the hollow fiber membrane threads, and the second potting portion is bonded to the second ends of the plurality of hollow fiber membrane threads and the ports of the second ends of the hollow fiber membrane threads are open, and the area where the plurality of hollow fiber membrane threads are located in the first potting portion and the second potting portion is the filtering portion;

[0011] The container comprises a accommodating chamber, a liquid inlet and a filtrate outlet located at both ends of the accommodating chamber, a liquid outlet chamber connected to the filtrate outlet and the second end of the hollow fiber membrane, and a liquid inlet chamber connected to the liquid inlet, wherein the hollow fiber membrane bundle is axially fixed in the accommodating chamber, the first potting portion and the second potting portion correspond to the liquid inlet and the filtrate outlet, respectively; the second potting portion is sealed and bonded to the inner wall of the container to separate the liquid outlet chamber from the liquid inlet chamber;

[0012] It also includes a first inner core fixed to the outer periphery of the first potting portion, wherein a gap is set between the first inner core and the inner wall of the container and the first inner core is axially fixed to the inner wall of the container;

[0013] The first potting portion includes a bonding section bonded to the inner wall of the first inner core and a protection section located axially outside the first inner core. The protection section is relatively close to the liquid inlet, and the bonding section and the protection section are an integrated structure.

[0014] In the hollow fiber assembly of the present invention, the first potting part and the second potting part of the hollow fiber membrane bundle are respectively arranged corresponding to the liquid inlet and the filtrate outlet; the first end of the hollow fiber membrane filament is bonded and fixed to the first inner core through the bonding section of the first potting part, and the first inner core is axially fixed to the inner wall of the container, and the accommodating cavity is located in the cavity between the liquid inlet and the second potting part (excluding the space occupied by the hollow fiber membrane filament, the first potting part and the first inner core) to form a liquid inlet cavity, and the gap between the first inner core and the inner wall of the container is a part of the liquid inlet cavity, and the accommodating cavity is located in the cavity between the filtrate outlet and the second potting part to form a liquid outlet cavity; wherein, the first potting part also includes a protective section located axially outside the first inner core, which is closer to the liquid inlet than the bonding section, and is integrally formed with the protective section.

[0015] For the first potting part, on the one hand, the boundary between the first potting part and the first inner core is no longer located at the axial end of the first potting part, that is, the boundary between the two is not directly exposed to the liquid inlet, but is located in the area axially inside the end of the first potting part. Since the protective section is located axially outside the first inner core, its end face facing the liquid inlet stream has an axial distance from the boundary between the bonding section and the inner wall of the first inner core, which prevents the liquid entering from the liquid inlet from directly impacting the boundary between the bonding section and the inner wall of the first inner core. Even if a small amount of liquid impacts the boundary between the bonding section and the inner wall of the first inner core, the impact force will be greatly weakened due to the change in the flow direction of the stream, and will not cause cracking at the boundary, thereby preventing the first The starting point of cracking cannot be formed between the bonding section of the potting part and the inner wall of the first inner core; on the other hand, the protection section and the bonding section are an integrated structure, which is equivalent to increasing the axial length of the first potting part, improving the mechanical strength of the first potting part, and being able to cope with greater impact force of the incoming liquid. The first potting part has higher stability and is difficult to form vibration relative to the first inner core, which is also beneficial to maintaining the bonding integrity between the bonding section and the first inner core; the two aspects are combined to achieve complete bonding between the bonding section and the first inner core, ensuring a stable and tight connection between the first potting part and the first inner core. Correspondingly, the bonding performance between the second potting part and the inner wall of the container is also more stable, and both ends of the hollow fiber membrane bundle are always stably fixed in the container.

[0016] Preferably, the outer diameter of the protective segment is larger than the outer diameter of the bonding segment, so that the radial outer ring of the protective segment covers the boundary between the bonding segment and the first inner core, so that the incoming liquid flow cannot contact or impact the boundary between the bonding segment and the first inner core, thereby better protecting the boundary between the bonding segment and the first inner core, and achieving a stable and tight connection between the first potting part and the first inner core.

[0017] Preferably, the first ends of the multiple hollow fiber membranes are flush with the end of the first inner core facing the liquid inlet or are located axially inward of the end of the first inner core facing the liquid inlet, so as to prevent the hollow fiber membranes from entering the protective section and destroying the integrity of the protective section. The protective section is composed of an integrated and complete potting glue, which has higher mechanical strength and can withstand greater liquid impact force, reduce the shaking of the first potting part, and ensure the bonding integrity between the first potting part and the first inner core.

[0018] Preferably, the axial length of the protection segment is 3-7 mm. On the one hand, the protection segment has sufficient axial length, and its end face directly facing the impact of the liquid is at a sufficient distance from the end face of the first inner core to avoid the liquid impacting the boundary between the bonding segment and the first inner core. On the other hand, it also ensures that the protection segment has sufficient mechanical strength to cope with the impact force of the liquid. If the axial length of the protection segment is less than 3 mm, the axial length of the protection segment is insufficient, and the end face directly facing the impact of the liquid is close to the end face of the first inner core. After the liquid impacts the end face of the protection segment, it still has a large impact force and will still impact the boundary between the bonding segment and the first inner core. The boundary between the bonding section and the first inner core is too large, and the mechanical strength of the protective section is insufficient; if the axial length of the protective section is greater than 7 mm, the end face of the protective section used to directly face the impact of the incoming liquid is too close to the liquid inlet. Not only is the impact force F of the incoming liquid on the protective section too large, but the distance d between the end face of the protective section and the end face of the first inner core is too far. Based on the torque formula M=F*d, the torque on the protective section and the boundary between the bonding section and the first inner core is too large, and the protective section may be skewed, thereby causing the boundary between the bonding section and the first inner core to tear, affecting the bonding integrity between the first potting part and the first inner core; moreover, if the distance between the protective section and the liquid inlet is too close, the liquid inlet channel will be blocked, affecting the liquid inlet efficiency.

[0019] Preferably, the axial length of the bonding section is 80-95% of the axial length of the first potting part; the protective section and the bonding section are an integrated structure, and the impact force received by the protective section will be transmitted to the bonding section to some extent. Therefore, the greater the proportion of the axial length of the bonding section in the first potting part, the better its stability, and it is less likely to break or shake relative to the first inner core when subjected to the impact force transmitted by the protective section, which also helps to avoid separation at the boundary between the bonding section and the first inner core; at the same time, the axial length of the protective section must also be reserved to prevent the incoming liquid from impacting the boundary between the bonding section and the first inner core.

[0020] Preferably, the axial length of the bonding section is 20-35% of the axial length of the first inner core to ensure that the bonding section has sufficient bonding area with the first inner core, and it has sufficient axial length inside the first inner core. The first inner core has a good radial limiting and axial fixing effect on the bonding section. Even if the bonding section is subjected to a small amount of impact force transmitted by the protective section or when the liquid flows, the bonding section can still maintain the bonding strength with the inner wall of the first inner core, and will not vibrate relative to the first inner core, thereby avoiding separation of the bonding section from the first inner core; if the ratio of the axial length of the bonding section to the first inner core is less than 20%, the bonding area between the bonding section and the first inner core is too small, and it is easy to be loosely bonded; if the ratio of the axial length of the bonding section to the first inner core is greater than 35%, the bonding section occupies too much hollow fiber membrane, and loses the filter part used for filtration, which reduces the filtration efficiency of the hollow fiber membrane.

[0021] Preferably, the first inner core includes a hole-forming section and a first solid section located at one axial end of the hole-forming section, and the first solid section is bonded and fixed to at least the axial end of the bonding section. The first solid section is hole-free, so that the structural strength of the first inner core in this area is relatively high, and at least part of the bonding section located within the first solid section is constrained by the first solid section, that is, the first solid section has a clamping effect on the first potting portion, and the bonding section and the first solid section have a large bonding area, thereby improving the bonding strength and reducing the possibility of the first potting portion shaking relative to the first inner core.

[0022] Preferably, the axial length of the first solid segment is 75-85% of the axial length of the bonding segment, that is, part of the bonding segment is bonded to the first solid segment, and the other part of the bonding segment is bonded to the hole-forming segment and embedded in the through hole on the hole-forming segment, forming a connection relationship similar to a bridge; the combination of the two has a higher bonding strength while ensuring the bonding area between the bonding segment and the first inner core.

[0023] Preferably, the other axial end of the first inner core has a second solid segment without holes, and the axial length of the second solid segment is 8-15% of the axial length of the first inner core; the outer circumferential intervals of the last segment of the second solid segment are provided with a plurality of connection parts for axial fixation with the container.

[0024] The second solid segment has no holes, and the structural strength of this area is relatively large, that is, the strength of the other axial end of the first inner core is ensured, and it occupies 8-15% of the axial length of the first inner core, that is, there is enough solid space to set a sufficiently large connection part to ensure the structural strength of the connection part. After the connection part is axially fixed to the container, the connection between the first inner core and the container is very stable and firm. The first inner core will not produce relative movement relative to the container, and the first potting part fixed to the first inner core will not produce relative movement relative to the container. The hollow fiber membrane bundle maintains axial extension in the container, and the flow path between the hollow fiber membrane filaments is stable, and the incoming liquid can fully contact and filter it.

[0025] Preferably, the axial length of the second potting portion is greater than the axial length of the bonding section of the first potting portion; and / or,

[0026] The axial length of the bonding section is 3-5% of the axial length of the hollow fiber membrane bundle, and the axial length of the second potting portion is 4-7% of the axial length of the hollow fiber membrane bundle.

[0027] The first end of the hollow fiber membrane in the first potting part is in a closed state, the incoming liquid will not enter the hollow fiber membrane from the first end, and the first potting part will not be subjected to the radial outward pressure of the liquid, while the second end of the hollow fiber membrane bundle in the second potting part is in an open state, the filtrate will flow out from the second end, and the second potting part will be subjected to the radial outward pressure of the liquid. Therefore, the hollow fiber assembly of the present invention sets the axial length of the second potting part to be larger, which can more stably fix the second end of the hollow fiber membrane, and at the same time sets the axial length of the bonding section of the first potting part to be smaller. On the premise of ensuring the bonding strength between the first potting part and the first inner core, the length of the bonding section of the first potting part can be reduced to increase the length of the hollow fiber membrane filtration part and improve the utilization rate of the hollow fiber membrane.

[0028] Preferably, the hollow fiber assembly further comprises a second inner core sleeved on the outer periphery of the second ends of the plurality of hollow fiber membrane threads, the second ends of the plurality of hollow fiber membrane threads pass through the second potting part, and the axial length L1 of the second inner core inserted into the second potting part is smaller than the axial length L2 of the second potting part, wherein L1 / L2=0.5-0.8.

[0029] The first inner core and the second inner core cooperate to fix the hollow fiber membrane axially in the container, and the second potting part is also bonded and fixed to the inner wall of the container and the second inner core. Specifically, if the second inner core penetrates the second potting part, the second potting part will be completely separated into inner and outer areas. Multiple hollow fiber membranes penetrate the inner area, and the outer area connects the outer wall of the second inner core and the inner wall of the container. Due to the partitioning effect of the second inner core, the integrity of the second potting part itself is destroyed, and the strength of the second potting part itself is damaged, which in turn affects the connection stability between the second potting part and the inner wall of the container. Therefore, L1 / L2=0.5-0.8 is set, and the second potting part has a part that is not inserted by the second inner core. This part is not divided into inner and outer areas by the second inner core, but is a bonded whole formed by the hollow fiber membrane around the center. It has better structural integrity and greater mechanical strength. It has higher bonding strength with the inner wall of the container, which is also beneficial to improve the connection stability between the second inner core and the inner wall of the container.

[0030] Preferably, the axial length of the first inner core is greater than the axial length of the second inner core; and / or the axial length of the second inner core is 8-15% of the axial length of the hollow fiber membrane bundle.

[0031] The first inner core is relatively close to the liquid inlet, and accordingly, the area of ​​the hollow fiber membrane bundle corresponding to the first inner core is also relatively close to the liquid inlet. The flow rate of the liquid at its periphery is higher, and the impact intensity on the hollow fiber membrane filaments is also higher. By increasing the length of the first inner core, the length of the area where the hollow fiber membrane filaments are wrapped by the first inner core is made longer, thereby forming more complete protection for the hollow fiber membrane filaments; the second inner core is far away from the liquid inlet and close to the filtrate outlet, and is subject to less impact force. Therefore, the axial length of the second inner core is 8-15% of the axial length of the hollow fiber membrane bundle, avoiding excessive blocking of the filtration part of the hollow fiber membrane filaments and accelerating the filtration rate.

[0032] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0033] In the hollow fiber assembly of the present invention, the first potting part and the second potting part of the hollow fiber membrane bundle are respectively arranged corresponding to the liquid inlet and the filtrate outlet; the first end of the hollow fiber membrane filament is bonded and fixed to the first inner core through the bonding section of the first potting part, and the first inner core is axially fixed to the inner wall of the container, and the accommodating cavity is located in the cavity between the liquid inlet and the second potting part (excluding the space occupied by the membrane filament, the first potting part and the first inner core) to form a liquid inlet cavity, and the gap between the first inner core and the inner wall of the container is a part of the liquid inlet cavity, and the accommodating cavity is located in the cavity between the filtrate outlet and the second potting part to form a liquid outlet cavity; wherein, the first potting part also includes a protective section located axially outside the first inner core, which is closer to the liquid inlet than the bonding section, and is integrally formed with the protective section.

[0034] For the first potting part, on the one hand, the boundary between the first potting part and the first inner core is no longer located at the axial end of the first potting part, but is located in the area axially inside the end of the first potting part. At the same time, since the protective section is located axially outside the first inner core, its end surface facing the liquid inlet has an end distance from the boundary between the bonding section and the inner wall of the first inner core, which avoids the liquid entering from the liquid inlet directly impacting the boundary between the bonding section and the inner wall of the first inner core. Even if a small amount of liquid impacts the boundary between the bonding section and the inner wall of the first inner core, the impact force has been greatly weakened and will not cause cracking at the boundary, that is, the bonding section of the first potting part is The starting point of cracking cannot be formed between the connecting section and the inner wall of the first inner core; on the other hand, the protection section and the bonding section are an integrated structure, which is equivalent to increasing the axial length of the first potting part, increasing the mechanical strength of the first potting part, and being able to cope with greater impact force of the incoming liquid. The first potting part has higher stability and is difficult to form vibration relative to the first inner core, which is also beneficial to maintaining the bonding integrity between the bonding section and the first inner core; the two aspects are combined to achieve complete bonding between the bonding section and the first inner core, ensuring a stable and tight connection between the first potting part and the first inner core, and both ends of the hollow fiber membrane bundle are always stably fixed in the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic structural diagram of a hollow fiber component according to an embodiment of the present invention.

[0037] Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle.

[0038] Figure 3 for Figure 2 Enlarged view of point B in the middle.

[0039] Figure 4 This is a schematic diagram of a first potting portion according to another embodiment of the present invention.

[0040] Figure 5 This is a schematic structural diagram of the first inner core of an embodiment of the present utility model.

[0041] Figure 6 This is a cross-sectional schematic diagram of the first inner core according to an embodiment of the present invention.

[0042] Figure 7This is a schematic structural diagram of the second inner core of an embodiment of the present utility model.

[0043] Description of Reference Numerals

[0044] 10. Hollow fiber membrane bundle; 11. First potting section; 111. Adhesive section; 112. Protective section; 12. Second potting section; 13. Hollow fiber membrane filament; 131. Filtration section;

[0045] 20. Container; 21. Receiving chamber; 22. Liquid inlet; 23. Filtrate outlet; 24. Retentate outlet; 25. Liquid outlet chamber; 26. Liquid inlet chamber;

[0046] 30. First inner core; 31. First solid segment; 32. Hole-forming segment; 33. Second solid segment; 34. Connecting portion;

[0047] 40. Second inner core. DETAILED DESCRIPTION

[0048] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0051] As attached Figure 1 and attached Figure 2As shown, the hollow fiber assembly of the embodiment of the present invention includes a hollow fiber membrane bundle 10 and a container 20. The hollow fiber membrane bundle 10 is axially fixed in the container 20. Specifically, the hollow fiber membrane bundle 10 includes a plurality of hollow fiber membrane threads 13 and a first potting portion 11 and a second potting portion 12 located at both axial ends of the hollow fiber membrane bundle 10. The first potting portion 11 is bonded to the first ends of the plurality of hollow fiber membrane threads 13 and closes the port of the first end of the hollow fiber membrane thread 13. The second potting portion 12 is bonded to the second ends of the plurality of hollow fiber membrane threads 13 and the hollow fiber membrane threads 13 are sealed. 3 has an open port at the second end, and the area between the area where the multiple hollow fiber membrane fibers 13 are located in the first potting part 11 and the second potting part 12 is the filtering part 131; the container 20 includes a accommodating chamber 21, a liquid inlet 22 and a filtrate outlet 23 located at both ends of the accommodating chamber 21, a liquid outlet chamber 25 connected to the filtrate outlet 23 and the second end of the hollow fiber membrane fibers 13, and a liquid inlet chamber 26 connected to the liquid inlet 22. The hollow fiber membrane bundle 10 is axially fixed in the accommodating chamber 21, and the first potting part 11 and the second potting part 12 correspond to the liquid inlet 22 and the filtrate outlet 23, respectively.

[0052] In order to protect the hollow fiber membrane 13, the hollow fiber assembly also includes a first inner core 30 fixed to the outer periphery of the first potting part 11. The first inner core 30 is set with a gap between the inner wall of the container 20 and is axially fixed with the inner wall of the container 20. The first end of the hollow fiber membrane 13 is located inside the first potting part 11, and the first potting part 11 is bonded and fixed to the inner wall of the first inner core 30 to achieve a fixed connection between the hollow fiber membrane 13 and the first inner core 30.

[0053] The accommodating chamber 21 is located in the cavity between the liquid inlet 22 and the second potting part 12 to form a liquid inlet chamber 26, and the gap between the first inner core 30 and the inner wall of the container 20 is a part of the liquid inlet chamber 26; the accommodating chamber 21 is located in the cavity between the filtrate outlet 23 and the second potting part 12 to form a liquid outlet chamber; the second potting part 12 is sealed and bonded to the inner wall of the container 20 to separate the liquid outlet chamber 25 and the liquid inlet chamber 26.

[0054] As attached Figure 2 As shown, in this embodiment, the liquid inlet 22 is located at the bottom end of the hollow fiber assembly, and the filtrate outlet 23 is located at the top end of the hollow fiber assembly. At the same time, the container 20 also has a retentate outlet 24, which is connected to the liquid inlet cavity 26, located axially below the second potting part, away from the liquid inlet 22, and is used to discharge the retentate retained outside the hollow fiber membrane 13; thus, after the filtrate enters the liquid inlet cavity 26 from the liquid inlet 22, the liquid level gradually rises, and the gas inside the accommodating cavity and the hollow fiber membrane is discharged from the filtrate outlet 23 or the retentate outlet 24, avoiding the occurrence of air blockage.

[0055] The liquid to be filtered is usually pure water, which enters the liquid inlet cavity 26 from the liquid inlet 22, flows through the gap between the first inner core 30 and the inner wall of the container 20, and flows to the second end of the hollow fiber membrane 13. Since the first end of the hollow fiber membrane 13 is closed, the port at the second end is connected to the liquid outlet cavity 25 and the filtrate outlet 23. Part of the liquid to be filtered enters the interior of the hollow fiber membrane 13 to form a filtrate, and flows out from the filtrate outlet 23. The residual liquid retained outside the hollow fiber membrane 13 is discharged from the residual liquid outlet 24.

[0056] Based on the arrangement of the liquid inlet 22 and the filtrate outlet 23 of the hollow fiber component during actual use, a relatively large pressure is required when the filtrate enters the liquid inlet 22, and the flow rate and flow velocity are relatively high. The impact force of the filtrate on the first potting part 11 and the first inner core 30 is also relatively large. If the boundary of the end face of the first potting part 11 and the first inner core 30 facing the liquid inlet is subjected to a continuous and high-intensity flow impact, the first potting part 11 and the first inner core 30 begin to crack at the boundary of the end face, and once the crack at the end face is formed, it will extend axially inward until the first potting part 11 appears. The outer wall of 1 and the inner wall of the first inner core 30 are completely detached, and the first inner core 30 fails to limit the hollow fiber membrane bundle. The hollow fiber membrane bundle can only be fixed in the accommodating chamber 21 by the second potting part 12 located at a high position, and the subsequent input of the filtrate will continue to impact the first potting part 11, and the hollow fiber membrane bundle 10 will form a swing relative to the second potting part 12, which is prone to damage at the boundary between the hollow fiber membrane filaments 13 and the second potting part 12. The second potting part 12 bears excessive weight and may also open with the inner wall of the container 20, and the liquid inlet chamber 26 and the liquid outlet chamber 25 are connected, and the filtrate and the filtrate are mixed.

[0057] To avoid the above situation, please Figure 3As shown, the first encapsulation portion 11 of this embodiment includes a bonding segment 111 bonded to the inner wall of the first inner core 30 and a protective segment 112 located axially outside the first inner core 30, the protective segment 112 is relatively close to the liquid inlet 22, and the bonding segment 111 and the protective segment 112 are an integrated structure. Due to the provision of the protective section 112 located axially outside the first inner core 30, the boundary between the first potting portion 11 and the first inner core 30 is no longer located at the axial end of the first potting portion 11, but is located in the area axially inside the end of the first potting portion 11. Therefore, the liquid entering from the liquid inlet 22 will not directly impact the boundary between the bonding section 111 and the first inner core 30. At the same time, the protective section 112 and the bonding section 111 are an integrated structure, which is equivalent to increasing the axial length of the first potting portion 11, increasing the mechanical strength of the first potting portion 11, and being able to cope with a greater impact force of the liquid. The first potting portion 11 has higher stability and is less likely to form vibration relative to the first inner core 30, which is also conducive to maintaining the bonding integrity between the bonding section 111 and the first inner core 30. The combination of the two effects realizes complete bonding between the bonding section 111 and the first inner core 30, ensures a stable and tight connection between the first potting portion 11 and the first inner core 30, and ensures that both ends of the hollow fiber membrane bundle 10 are always stably fixed in the container 20.

[0058] In the attached Figure 3 In the illustrated embodiment, the outer diameter of the protection section 112 is comparable to the inner diameter of the first inner core 30 and the outer diameter of the bonding section 111 , making processing more convenient.

[0059] In the attached Figure 4 In another embodiment shown, the outer diameter of the protective segment 112 is larger than the outer diameter of the bonding segment 111, so that the radial outer ring of the protective segment 112 covers the boundary between the bonding segment 111 and the first inner core 30. Therefore, unless the protective segment 112 is broken through or peeled off, the incoming liquid cannot contact and impact the boundary between the bonding segment 111 and the first inner core 30, thereby better protecting the boundary between the bonding segment 111 and the first inner core 30 and achieving a more stable and tight connection between the first encapsulation part 11 and the first inner core 30. Preferably, the outer diameter of the protective segment 112 can be comparable to the outer diameter of the first inner core 30. In this way, the end surface bonding area between the protective segment 112 and the first inner core 30 is larger, the bonding is stronger, the protective segment 112 is less likely to shake relative to the first inner core 30, and the boundary between the bonding segment 111 and the first inner core 30 is firmly wrapped between the side walls of the protective segment 112 and the first inner core 30, that is, the starting point of the crack between the bonding segment 111 of the first encapsulation part 11 and the inner wall of the first inner core 30 cannot be formed.

[0060] As attached Figure 3In the illustrated embodiment, the first ends of the multiple hollow fiber membranes 13 are flush with the end face of the first inner core 30 facing the liquid inlet 22. This means that the hollow fiber membranes 13 do not penetrate the protective section 112. The protective section 112 is formed of a single, integrated potting compound, which provides increased mechanical strength and can withstand greater impact forces from the inflow of liquid. Of course, in other embodiments, the first ends of the multiple hollow fiber membranes 13 can be located axially inward of the end of the first inner core 30 facing the liquid inlet 22, which can also achieve the same effect.

[0061] As attached Figure 3 As shown, the axial length of the protection section 112 is H1, and the value range of H1 is 3-7mm, including the end value. The axial length of the bonding section 111 is H2, and the axial length of the first potting part 11 is H3, H2 = 80-95% H3, for example, H1 is 3mm, H2 = 57mm, and H3 = 60mm. The reason for adopting the above numerical range is that the protection section 112 needs to have a sufficient axial length to ensure the mechanical strength of the protection section 112 and to prevent the liquid from impacting the boundary between the bonding section 111 and the first inner core 30. At the same time, the bonding section 111 also needs a sufficient axial length to ensure the bonding strength between the first potting part 11 and the first inner core 30; and the total axial length of the first potting part 11 is not too long, which will occupy too many hollow fiber membranes 13 and reduce their filtration efficiency.

[0062] If the axial length H1 of the protective segment 112 is less than 3 mm, the axial length of the protective segment is insufficient, and the end face used to directly face the impact of the liquid is close to the end face of the first inner core 30. After the liquid impacts the end face of the protective segment, it still has a large impact force and will still impact the boundary between the bonding segment and the first inner core, and the mechanical strength of the protective segment is insufficient; if the axial length of the protective segment is greater than 7 mm, the end face of the protective segment used to directly face the impact of the liquid is too close to the liquid inlet. Not only is the impact force F of the liquid on the protective segment too large, but the distance d between the end face of the protective segment and the end face of the first inner core is too far. Based on the torque formula M=F*d, the torque on the protective segment and the boundary between the bonding segment and the first inner core is too large, and the protective segment may be skewed, thereby causing the boundary between the bonding segment and the first inner core to tear, affecting the bonding integrity between the first potting part and the first inner core; and, if the distance between the protective segment and the liquid inlet is too close, the liquid inlet channel will be blocked, affecting the liquid inlet efficiency.

[0063] If H2 is less than 80% of H3, the axial length of the bonding section is too short, the bonding area and bonding strength are insufficient, and the axial length of the protective section is too long, with the same effects as described above; if H2 is greater than 95% of H3, the axial length of the protective section is too short, and it fails to protect the boundary between the bonding section and the first inner core.

[0064] As attached Figure 2As shown, the axial length of the first inner core 30 is H4, and the axial length H2 of the bonding section 111 is 20-35% of the axial length H4 of the first inner core 30, ensuring that the bonding section 111 and the first inner core 30 have sufficient bonding area and bonding strength, while avoiding the bonding section 111 occupying too much hollow fiber membrane filament 13 and reducing its filtration efficiency.

[0065] On the other hand, as attached Figure 5 and attached Figure 6 As shown, the first inner core 30 includes a hole-forming section 32 and a first solid section 31 located at one axial end of the hole-forming section 32. The first solid section 31 has no holes and has high structural strength, and can play a radial restraining and tightening role on the bonding section 111 of the first potting part 11.

[0066] The first entity segment 31 is bonded and fixed to at least the axial end of the bonding segment 111, including two situations, namely, the bonding segment 111 is only bonded and fixed to the first entity segment 31, or the bonding segment 111 is bonded to the first entity segment 31 and part of the hole-forming segment 32 at the same time.

[0067] Specifically, in some embodiments, the axial length of the first solid segment 31 is H5, and the axial length of the bonding segment 111 is H2, H5≥H2, that is, the bonding segment 111 is only bonded to the first solid segment 31. Since the first solid segment 31 has no holes, the structural strength of this area is relatively large. The first solid segment 31 has a tightening effect on the first potting part 11, and the bonding segment 111 and the first solid segment 31 have a large bonding area and bonding strength, which reduces the possibility of the first potting part 11 shaking relative to the first inner core 30; and more filtering parts 131 of the hollow fiber membrane filaments 13 are left, and the filtration efficiency is higher.

[0068] And as attached Figure 2 As shown, in this embodiment, the axial length of the first solid segment 31 is H5, the hole-forming segment 32 is located on the side of the first solid segment 31 away from the liquid inlet 22, and the bonding segment 111 is bonded to the first solid segment 31 and part of the hole-forming segment 32 at the same time. Preferably, the axial length of the first solid segment 31 is 75-85% of the axial length of the bonding segment 111, that is, H5 = 75-85% H2, the rest of the bonding segment 111 is bonded to the hole-forming segment 32, and part of the bonding segment 111 is bonded to the hole-forming segment 32 and embedded in the through hole on the hole-forming segment 32, forming a connection relationship similar to a bridge; the combination of the two has a higher bonding strength while ensuring the bonding area between the bonding segment 111 and the first inner core 30.

[0069] As attached Figure 6As shown, the other axial end of the first inner core 30 has a second solid segment 33 without holes, and its axial length is H6, satisfying H6=8-15% H4; the function of the second solid segment 33 is to provide a setting position for the connecting part 34 and ensure the structural strength of the connecting part 34. The first inner core 30 will not produce relative movement relative to the container 20, and the first potting part 11 fixed to the first inner core 30 will not produce relative movement relative to the container 20. The hollow fiber membrane bundle 10 maintains axial extension in the container 20, and the flow path between the hollow fiber membrane filaments 13 is stable, so that the incoming liquid can fully contact and filter it.

[0070] Specifically, as attached Figure 5 As shown, the connecting portion 34 is an insert formed by radially extending the outer wall of the second solid section 33 of the first inner core 30. In this embodiment, there are six inserts, which are evenly distributed circumferentially on the outer wall of the second solid section 33. The corners of the inserts are all rounded to reduce the formation of dead angles. Figure 2 As shown, the container 20 includes a cylindrical body and two end covers, and the plug is inserted between the cylindrical body and one end cover and fixed, thereby fixing the first inner core 30. The space between adjacent plugs is also part of the liquid inlet chamber 26, which can guide the liquid to be filtered to be evenly distributed in the liquid inlet chamber 26 and fully contact the filter part 131 of the hollow fiber membrane 13.

[0071] If H6 is less than 8% of H4, the axial length of the second entity segment 33 is too short. On the one hand, its own mechanical strength is low and it cannot withstand the force when the hollow fiber membrane bundle 10 shakes. On the other hand, the connection part 34 is set at a small position, which makes the size of the connection part 34 small and the structural strength of the connection part 34 weak, resulting in a loose connection between the first inner core 30 and the container 20; if H6 is greater than 15%, the axial length of the second entity segment 33 is too long. Combined with the axial length of the first entity segment 31, the axial length of the hole-forming segment 32 is too short, and the number and area of ​​the through holes thereon are insufficient, so that the hollow fiber membrane 13 located inside the first inner core 30 cannot fully contact the incoming liquid, resulting in low filtration efficiency.

[0072] As attached Figure 2 As shown, the axial length of the second potting part 12 is L2, the axial length of the bonding section 111 of the first potting part 11 is H2, and L2>H2; the axial length of the hollow fiber membrane bundle 10 is S, the axial length H2 of the bonding section 111 satisfies, H2=3-5%S, and the axial length L2 of the second potting part 12 satisfies, L2=4-7%S.

[0073] The reason for adopting the above numerical range is that the first end of the hollow fiber membrane filament 13 in the first potting part 11 is in a closed state, the incoming liquid will not enter the hollow fiber membrane filament 13 from the first end, and the interior of the first potting part 11 will not be subjected to the radial outward pressure of the liquid, while the second end of the hollow fiber membrane bundle 10 in the second potting part 12 is in an open state, the filtrate will flow out from the second end, and the interior of the second potting part 12 will be subjected to the radial outward pressure generated by the filtrate. Therefore, whether the axial length of the second potting part 12 is set to be greater than the axial length of the bonding section 111, or whether The proportion of the length of the bonding section 111 and the second potting section 12 in the hollow fiber membrane bundle 10 is both intended to set the axial length of the second potting section 12 to be larger, so that the second end of the hollow fiber membrane filament 13 can be fixed more stably, and the axial length of the bonding section 111 of the first potting section 11 is set to be smaller. On the premise of ensuring the bonding strength between the first potting section 11 and the first inner core 30, the length of the bonding section 111 of the first potting section 11 can be reduced to increase the length of the filtering section 131 of the hollow fiber membrane filament 13 and improve the utilization rate of the hollow fiber membrane filament 13.

[0074] The second potting part 12 can independently bond the second ends of the plurality of hollow fiber membranes 13 and the inner wall of the container 20, or can be bonded to the inner wall of the container 20 as shown in the attached figure. Figure 2 and attached Figure 7 As shown, the hollow fiber assembly also includes a second inner core 40 that is sleeved on the outer periphery of the second ends of the multiple hollow fiber membrane fibers 13. The function of the second inner core 40 is to cooperate with the first inner core 30 to axially fix the hollow fiber membrane fibers 13 in the container 20, while protecting the second ends of the multiple hollow fiber membrane fibers 13 to avoid being impacted by the flow of liquid.

[0075] In this embodiment, the positional relationship between the second potting part 12 and the second inner core 40 is that the end portion of the second inner core 40 facing the filtrate outlet 23 is inserted into the second potting part 12; if the second inner core 40 passes through the second potting part 12, the second potting part 12 will be completely separated into two parts, inner and outer parts, and multiple hollow fiber membranes 13 pass through the interior, while the outside is connected to the outer wall of the second inner core 40 and the inner wall of the container 20. Due to the partitioning effect of the second inner core 40, the integrity and strength of the second potting part 12 itself are destroyed, thereby affecting the stability of the connection between the second inner core 40 and the inner wall of the container 20. Preferably, in this embodiment, the axial length L1 of the second inner core 40 inserted into the second potting portion 12 is smaller than the axial length L2 of the second potting portion 12, so that the second potting portion 12 has a portion not inserted by the second inner core 40. The second potting portion 12 of this portion is not divided into inner and outer areas by the second inner core 40, but is bonded to the area surrounding the central hollow fiber membrane 13 into a whole, which has greater mechanical strength and greater bonding strength with the inner wall of the container 20, which is beneficial to improving the connection stability between the second inner core 40 and the inner wall of the container 20; Specifically, L1 / L2=0.5-0.8; if L1 / L2<0.5, the portion of the second inner core 40 inserted into the second potting part 12 is too shallow, and under the action of the liquid flow pressure, the second inner core 40 is easy to shake relative to the second potting part 12, causing the second potting part 12 to separate from the second inner core 40; if L1 / L2>0.8, the portion of the second inner core 40 inserted into the second potting part 12 is too deep, destroying the integrity and mechanical strength of the second potting part 12, thereby affecting the connection between the second inner core 40 and the inner wall of the container 20.

[0076] As attached Figure 7 As shown, the end of the second inner core 40 of this embodiment is also provided with a solid section and a connecting portion. The shape and distribution of the connecting portion are the same as those of the connecting portion on the first inner core, both of which are plug-in blocks. Similarly, as shown in the attached Figure 2 As shown, the insert is inserted between the cylindrical body of the container 20 and the other end cap and secured, thereby securing the second inner core 40 within the other end of the container 20. The space between adjacent inserts also forms part of the liquid inlet cavity 26, allowing the retentate liquid to flow through the outside of the second inner core 40 toward the retentate liquid outlet 24. Of course, the retentate liquid within the second inner core 40 flows through the through holes in the second inner core 40 toward the retentate liquid outlet 24.

[0077] The first inner core 30 is relatively close to the liquid inlet 22. Correspondingly, the area of ​​the hollow fiber membrane bundle 10 corresponding to the first inner core 30 is also relatively close to the liquid inlet 22. The flow rate of the liquid to be filtered at its periphery is higher, and the intensity of the impact on the hollow fiber membrane filament 13 is also higher. Therefore, the axial length of the first inner core 30 is H4, and the axial length of the second inner core 40 is H7, satisfying H4>H7. The length of the first inner core 30 is appropriately increased, so that the length of the area where the first end of the hollow fiber membrane filament 13 is wrapped is larger; at the same time, the axial length of the second inner core 40 is shortened, so that more of the filter part 131 is exposed in the middle of the hollow fiber membrane filament 13, which is in full contact with the incoming liquid, thereby improving the filtration efficiency.

[0078] Similarly, the axial length H7 of the second inner core 40 and the axial length S of the hollow fiber membrane bundle 10 satisfy H7=8-15%S; if H7<8%S, the second inner core 40 has insufficient protection for the hollow fiber membrane filaments 13, and the hollow fiber membrane filaments 13 are prone to shaking under the action of the incoming liquid flow pressure, affecting the stability of the flow channel; if H7>15%S, the second inner core 40 covers too much area of ​​the hollow fiber membrane filaments 13, and the incoming liquid needs to enter the second inner core 40 to contact the filter part 131 of the hollow fiber membrane filaments 13. The incoming liquid is easily discharged from the container 20 without sufficient contact with the filter part 131, affecting the filtration efficiency.

[0079] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A hollow fiber module comprising: A hollow fiber membrane bundle comprises a plurality of hollow fiber membrane threads and a first potting portion and a second potting portion located at both axial ends of the hollow fiber membrane bundle, wherein the first potting portion is bonded to the first ends of the plurality of hollow fiber membrane threads and closes the ports of the first ends of the hollow fiber membrane threads, and the second potting portion is bonded to the second ends of the plurality of hollow fiber membrane threads and the ports of the second ends of the hollow fiber membrane threads are open, and the area where the plurality of hollow fiber membrane threads are located in the first potting portion and the second potting portion is the filtering portion; The container comprises a accommodating chamber, a liquid inlet and a filtrate outlet located at both ends of the accommodating chamber, a liquid outlet chamber connected to the filtrate outlet and the second end of the hollow fiber membrane, and a liquid inlet chamber connected to the liquid inlet. The hollow fiber membrane bundle is axially fixed in the accommodating chamber, and the first potting part and the second potting part correspond to the liquid inlet and the filtrate outlet respectively; the second potting part is sealed and bonded to the inner wall of the container to separate the liquid outlet chamber and the liquid inlet chamber; characterized in that, It also includes a first inner core fixed to the outer periphery of the first potting portion, wherein a gap is set between the first inner core and the inner wall of the container and the first inner core is axially fixed to the inner wall of the container; The first potting portion includes a bonding section bonded to the inner wall of the first inner core and a protection section located axially outside the first inner core. The protection section is relatively close to the liquid inlet, and the bonding section and the protection section are an integrated structure.

2. The hollow fiber module according to claim 1, wherein The outer diameter of the protection segment is greater than the outer diameter of the bonding segment, so that the radial outer ring of the protection segment covers the boundary between the bonding segment and the first inner core.

3. The hollow fiber module according to claim 1, wherein The first ends of the plurality of hollow fiber membranes are flush with the end of the first inner core facing the liquid inlet or are located axially inward of the end of the first inner core facing the liquid inlet.

4. The hollow fiber module according to any one of claims 1 to 3, characterized in that: The axial length of the protection segment is 3-7 mm.

5. The hollow fiber module according to any one of claims 1 to 3, characterized in that: The axial length of the bonding section is 80-95% of the axial length of the first potting portion; and / or the axial length of the bonding section is 20-35% of the axial length of the first inner core.

6. The hollow fiber module according to claim 1, wherein The first inner core includes a hole-forming section and a first solid section located at one axial end of the hole-forming section, and the first solid section is bonded and fixed to at least an axial end of the bonding section.

7. The hollow fiber module according to claim 6, wherein The axial length of the first solid segment is 75-85% of the axial length of the bonding segment; and / or, The other axial end of the first inner core has a second solid segment without holes, and the axial length of the second solid segment is 8-15% of the axial length of the first inner core; the outer circumferential intervals of the end section of the second solid segment are provided with a plurality of connection parts for axial fixation with the container.

8. The hollow fiber module according to claim 1, wherein The axial length of the second potting portion is greater than the axial length of the bonding section of the first potting portion; and / or, The axial length of the bonding section is 3-5% of the axial length of the hollow fiber membrane bundle, and the axial length of the second potting portion is 4-7% of the axial length of the hollow fiber membrane bundle.

9. The hollow fiber module according to claim 1, wherein It also includes a second inner core sleeved on the outer periphery of the second ends of the plurality of hollow fiber membranes, the second ends of the plurality of hollow fiber membranes pass through the second potting portion, and the axial length L1 of the second inner core inserted into the second potting portion is less than the axial length L2 of the second potting portion, wherein, L1 / L2=0.5-0.

8.

10. The hollow fiber module according to claim 9, wherein The axial length of the first inner core is greater than the axial length of the second inner core; and / or the axial length of the second inner core is 8-15% of the axial length of the hollow fiber membrane bundle.

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