Hollow fiber filtering assembly

Abstract

The utility model discloses a hollow fiber filtering assembly which comprises a cylinder body and a hollow fiber bundle positioned in an inner cavity of the cylinder body, and further comprises an end cover, and the hollow fiber bundle is divided into a plurality of small hollow fiber bundles by the end cover; at least one end of the small hollow fiber bundle is correspondingly arranged in the insertion groove, a sealing position for separating the side opening from the end opening is formed by the small hollow fiber bundle and the inner circumferential face of the insertion groove, the sealing structure further comprises a sealing area formed on the inner surface side of the end cover, and the inner surface of the end cover is separated from the inner cavity through the sealing area; a relatively continuous filling surface is formed, a feed liquid retention area is not easy to form, and meanwhile, the sealing area and the plurality of hollow fiber bundles are all circumferentially sealed, so that a final sealing surface is not overlapped with the inner surface of the end cover, and feed liquid only impacts the sealing surface at the end part of the sealing area; therefore, the sealing joint of the sealing position and the inner surface of the end cover is prevented from cracking due to impact of feed liquid, and the sealing effect of the sealing position is not affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field, especially a kind of hollow fiber filter assembly. BACKGROUND

[0002] Hollow fiber filter is widely used in water purification, separating components from biological fluids, dialysis, reverse osmosis, gas separation, cell culture device and many other fields in tangential flow (alternating reciprocating tangential flow and circulating tangential flow, etc.) and normal flow filtering system. Hollow fiber filter includes cylinder and hollow fiber membrane bundle axially fixed in cylinder, both ends of membrane bundle are sealed and fixed to both ends of inner wall of cylinder, and at least one end of membrane bundle is open, for discharging filtrate.

[0003] In prior art, hollow fiber membrane assembly disclosed in US application US20020179516A1, hollow fiber membrane filaments are inserted into gap or compartment defined by fastened segmented element in desired order and according to specified packing density, and then loaded into outer shell cylinder, fiber end portion is potting in usual way, so that fiber end portion is sealingly fixed at end portion of outer shell cylinder. When potting glue, potting glue amount is prepared with the preset length of potting portion being substantially same as the length of segmented element, then potting glue of membrane filament root portion can be not filled uniformly and insufficiently, especially at inner surface of segmented element, there is still bonding gap between surface of potting glue after solidification and membrane filament root portion or inner surface of segmented element, when axial dimension of bonding gap is too large, material liquid stagnation area is easily formed at membrane filament root portion corresponding to surface of potting glue after solidification, thereby affecting filtering efficiency and overall performance of filter. SUMMARY

[0004] In view of the deficiencies in prior art, the utility model aims at providing a kind of hollow fiber filter assembly, solve the problem that material liquid stagnation area is formed in the potting glue inner surface of membrane bundle of existing hollow fiber filter.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A hollow fiber filter assembly, comprising:

[0007] The cylinder includes an axially extending inner cavity, a side port and an end port, the end port is close to the end of the cylinder, and the side port is located on the side of the cylinder;

[0008] The hollow fiber bundle is located in the inner cavity and extends at least partially axially, and the hollow fiber bundle includes a plurality of hollow fiber filaments extending at least partially axially, at least one end of the hollow fiber filaments is open and communicates with the end port;

[0009] Further comprising: an end cover fixed at the port, the end cover comprising an inner surface, an outer surface, and a slot axially extending through the inner surface and the outer surface to separate the hollow fiber bundle into multiple small bundles of hollow fibers, and at least one end of the small bundles of hollow fibers is correspondingly arranged in the slot and forms a sealing position with the inner circumferential surface of the slot to separate the side port and the port;

[0010] Further comprising a sealing area arranged on the inner surface side of the end cover, the sealing area is axially located between the sealing position and the side port, and radially extends and forms a circumferential sealing connection between the multiple small bundles of hollow fibers, so that the inner surface of the end cover is isolated from the inner cavity.

[0011] The hollow fiber filter assembly of the utility model utilizes the end cover to fix the end part of the hollow fiber bundle, the end cover is located between the side port and the port in the axial direction of the cylinder body, the inner surface thereof faces the inside of the cylinder body, and the outer surface thereof is the end part opposite to the inner surface in the axial direction, the hollow fiber bundle is separated into multiple small bundles of hollow fibers by the slot on the end cover, the small bundles of hollow fibers form the sealing position with the slot, meanwhile, the inner surface of the end cover is provided with the sealing area, the sealing position and the sealing area are connected with each other, and both are formed by the pouring sealing process of pouring glue; the pouring glue of the sealing area fully covers the inner surface of the end cover without any gap, forms a continuously extending pouring sealing surface, completely and fully covers the bonding gap, and reduces the retention of the feed liquid; meanwhile, the sealing area connects and seals the multiple small bundles of hollow fibers in the circumferential direction, that is, the pouring sealing surface of the sealing area is the final sealing surface, and the inner surface of the end cover is completely and fully covered, so that the feed liquid only directly impacts the sealing surface of the end part of the sealing area, thereby avoiding that the sealing connection part between the sealing position and the inner surface of the end cover is cracked by the impact of the feed liquid and affecting the sealing effect of the sealing position; the sealing area and the sealing position cooperate, not only improve the sealing performance and the connection firmness of the end part of the small bundle of hollow fibers, fix the position of the small bundle of hollow fibers, and is favorable for reducing the influence of the shaking of the small bundle of hollow fibers on the filtration process; but also can form a relatively continuous pouring sealing surface on the side of the end part of the small bundle of hollow fibers close to the inside of the cylinder body, and avoid the retention of the feed liquid caused by the bonding gap between the pouring glue, the hollow fiber membrane wire and the inner surface of the slot.

[0012] Preferably, a baffle is arranged in the inner cavity, the baffle axially extends and surrounds all the small bundles of hollow fibers, the radial projection of the baffle covers the side port, and the baffle is provided with a channel for the flow of the feed liquid.

[0013] In some cases, the feed liquid entering or flowing out of the side port will cause radial impact on the hollow fiber bundle, so that the hollow fiber bundle is displaced radially relative to the sealing position and the end cap, close to or away from the side port, the membrane filament is deformed or bent and damaged, therefore, the baffle is arranged in the inner cavity to block the feed liquid entering the side port or to change the flow direction of the feed liquid flowing to the opening, the feed liquid can only contact the hollow fiber bundle through the passage on the baffle, greatly reducing the impact on the hollow fiber bundle, improving the stability of the position of the hollow fiber bundle, so as to facilitate maintaining the stability of the size of the flow gap, reducing the state of the hollow fiber bundle and the flow gap being stacked or aggregated due to the external force of the feed liquid, thereby facilitating the change of the spacing between the membrane filaments of the hollow fiber bundle to be small, so that the feed liquid fully contacts each hollow fiber bundle, and the filtration efficiency is high.

[0014] Preferably, the baffle is an integral structure, and the passage is a flow hole formed on the baffle; or the baffle is a split structure, including a plurality of split plates, and the passage is a gap between adjacent split plates.

[0015] The baffle of the integral structure has high mechanical strength and good blocking effect on the feed liquid, and the flow hole on the baffle connects the side port and the outer peripheral space of the hollow fiber membrane filament, ensuring that the feed liquid can fully contact and filter the hollow fiber membrane filament; the baffle of the split structure has higher adaptability, can adapt to different sizes of the cylinder, and can adjust the gap between adjacent baffles according to the flow rate of the feed liquid to adjust the amount of feed liquid flowing through the passage, so as to avoid the flow rate of the feed liquid in the inner cavity being too slow to affect the filtration efficiency.

[0016] Preferably, the end portion of the baffle is fixedly connected with the end cap located on the same side in the axial direction; the axially extending baffle can assist in positioning the two end caps, improving the stability of the end caps and the firmness of the connection with the inner wall of the cylinder, and also facilitating the stability of the flow gap between the hollow fiber bundles.

[0017] Preferably, at least one of the channels is located between the sealing area and the side opening in the axial direction, defined as a first channel, the axial minimum distance of the first channel to the sealing area is L1, the axial minimum distance of the first channel to the side opening is L2, and L1 / L2=0.02-0.15 is satisfied; controlling the ratio of the two within the above range makes the distance between the first channel and the sealing area moderate, without a large stagnant area, and the feed liquid passing through the first channel can still maintain a certain flow rate and disperse quickly after entering between the hollow fiber membrane filaments, and the area near the sealing area of the hollow fiber membrane filaments is also taken into account to improve the utilization rate of the hollow fiber membrane filaments, the axial distance of the feed liquid exchange between the channel and the side opening is short, which is beneficial to the rapid exchange of the feed liquid between the channel and the side opening, and promotes the feed liquid transfer efficiency. At the same time, even if the sealing area slightly exceeds the preset position due to the defects of the pouring sealing process, the first channel still has a certain axial distance, which will not block the first channel, and even the axial distance between the first channel and the sealing area can be shortened, so that the feed liquid can contact and filter more quickly with more hollow fiber membrane filaments.

[0018] Preferably, at least one of the channels is located between the sealing area and the side opening in the axial direction, defined as a first channel, the axial minimum distance of the first channel to the sealing area is L1, the maximum axial thickness of the sealing area is D, and D / L1=0.2-2 is satisfied; controlling the ratio of the two within the above range ensures the axial thickness of the sealing area, so that the sealing area is radially continuously sealed with the hollow fiber membrane filaments and completely covers the sealing connection between the entire sealing position and the hollow fiber membrane filaments and the inner surface of the end cover, and the sealing area has high strength and is not easy to break, and the sealing effect is good, and the pouring sealing glue also avoids blocking the first channel.

[0019] Preferably, the baffle and the adjacent hollow fiber small bundle form a sealing joint therebetween, which extends radially and is connected integrally with the sealing area, so as to improve the stability of the baffle inside the cylinder.

[0020] Preferably, the outer periphery of the hollow fiber small bundle is surrounded by a connecting net, which extends axially and is connected with the sealing area and the sealing position; the connecting net functions to cover the hollow fiber small bundle to avoid shaking with the feed liquid flow, and in addition, the connecting net can serve as a supporting component in the sealing area and the sealing position to improve the structural strength of the sealing area and the sealing position.

[0021] Preferably, the first end of the hollow fiber bundle corresponds to the insertion slot of the end cover to form a first sealing position, the connecting net extends axially, and one end is connected to the first sealing position; the axial thickness of the first sealing position is P1, the axial length of the end of the connecting net connected to the first sealing position in the first sealing position is Q1, and Q1 / P1=0.2-0.8 is satisfied; and / or the number of ports is two, located at the axial two ends of the cylinder body, the number of end covers is two, corresponding to one of the ports respectively, the second end of the hollow fiber bundle corresponds to the insertion slot of the other end cover to form a second sealing position, the connecting net extends axially, and one end is connected to the second sealing position; the axial thickness of the second sealing position is P2, the axial length of the end of the connecting net connected to the second sealing position in the second sealing position is Q2, and Q2 / P2=0.2-0.8 is satisfied.

[0022] Q1 and Q2 respectively represent the axial length of the connecting net into the first sealing position and the second sealing position, and the value of Q2 / P2 reflects the axial length of the connecting net into the second sealing position. If the ratio is too large, the end of the connecting net is too close to the outer surface of the first sealing position or the second sealing position. If a small amount of damage occurs in the first sealing position or the second sealing position, the first sealing position or the second sealing position itself may not be sealed, but the material liquid may leak through the connecting net, resulting in sealing failure. If the ratio is too small, the connecting net has poor connecting and fixing effect on the first sealing position and the sealing area on the same side and the second sealing position and the sealing area on the same side, and the connecting net is easy to separate from the first sealing position and the sealing area on the same side or the second sealing position and the sealing area on the same side, and is difficult to play a supporting and connecting role.

[0023] Preferably, the sealing position and the sealing area are of an integrated structure, that is, they are formed by curing the pouring glue at the same time during pouring and sealing, and the integrated structure has higher mechanical strength and connecting strength, and the sealing position and the sealing area are not easy to separate, and have better fixing and sealing effects on the hollow fiber bundle.

[0024] In summary, compared with the prior art, the utility model has at least the following beneficial effects:

[0025] The hollow fiber filtering assembly fixes the end part of the hollow fiber bundle by the end cover, the end cover is located between the side opening and the end opening in the axial direction of the cylinder, the inner surface of the end cover faces the inside of the cylinder, the outer surface of the end cover is opposite to the inner surface in the axial direction, the hollow fiber bundle is divided into multiple small hollow fiber bundles by the insertion slot on the end cover, the small hollow fiber bundle and the insertion slot form a sealing position, the inner surface of the end cover is provided with a sealing area, the sealing position and the sealing area are connected with each other, and the sealing area and the sealing position are formed by the pouring sealing process of the pouring sealing glue; the pouring sealing glue of the sealing area covers the inner surface of the end cover completely and does not have any gap, a continuous pouring sealing surface is formed, the bonding gap is completely and sufficiently covered, and the material liquid retention is reduced; meanwhile, the sealing area connects and seals the multiple small hollow fiber bundles in the circumferential direction, that is, the pouring sealing surface of the sealing area is the final sealing surface, and the inner surface of the end cover is completely and sufficiently covered, the material liquid only directly impacts the sealing surface of the end part of the sealing area, so that the sealing connection part of the sealing position and the inner surface of the end cover is prevented from being cracked due to the impact of the material liquid, and the sealing effect of the sealing position is affected; the sealing area and the sealing position are matched, the sealing performance and the connection firmness of the end part of the small hollow fiber bundle are improved, the position of the small hollow fiber bundle is fixed, and the influence of the shaking of the small hollow fiber bundle on the filtering process is reduced; and a relatively continuous pouring sealing surface can be formed on the side of the end part of the small hollow fiber bundle close to the inside of the cylinder, and the material liquid retention caused by the bonding gap between the pouring sealing glue, the hollow fiber membrane wire and the inner surface of the insertion slot is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0027] Figure 1 It is a structure schematic view of the hollow fiber filtering assembly of the embodiment of the present utility model.

[0028] Figure 2 It is a cross-sectional structure schematic view of the hollow fiber filtering assembly of the embodiment of the present utility model.

[0029] Figure 3 It is a cross-sectional schematic view of the hollow fiber bundle and the baffle of the embodiment of the present utility model.

[0030] Figure 4 It is an enlarged view of A in Figure 3

[0031] Figure 5 It is a schematic view of the end cover and the small hollow fiber bundle of the embodiment of the present utility model.

[0032] REFERENCE SIGNS​

[0033] 10, barrel; 11, inner cavity; 12, side port; 13, end port;

[0034] 20, hollow fiber bundle; 21, hollow fiber bundlelet; 22, first end; 23, second end; 24, first sealing position; 25, second sealing position;

[0035] 30, end cap; 31, outer surface; 32, inner surface; 33, insertion slot; 34, sealing area;

[0036] 40, baffle; 41, first channel; 42, flow-through hole; 43, sealing joint. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application.

[0038] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0040] The hollow fiber filter of the utility model embodiment, including cylinder 10 and hollow fiber bundle 20 in cylinder 10, cylinder 10 includes the inner chamber 11 of axial extension, the side mouth 12 of communication with inner chamber 11 and port 13, the number of side mouth 12 can be one, also can be two, side mouth 12 can be set on the lateral wall of cylinder 10, and its side mouth direction is perpendicular to the axial direction of cylinder or presents a certain angle;Port 13 is close to the axial end of cylinder 10, and the number can be one, can be two, in some embodiments, port 13 is located at the axial both ends of cylinder 10, and the number is two, and is opened along the axial direction of cylinder 10;In another embodiment, port 13 is located on the lateral wall close to the end of cylinder 10, and its side mouth 12 direction is perpendicular to the axial direction of cylinder 10 or presents a certain angle.Hollow fiber bundle 20 is located in the inner chamber 11 of cylinder 10 and at least partially extends axially.As shown in Figure 1 Some embodiments, the hollow fiber bundle 20 is axially extended as a whole;In another embodiment, the cylinder 10 is U-shaped, including two straight sections and a turning section, the axial direction of the cylinder 10 refers to the axial direction of the straight section, the two ports 13 are oriented in the same direction and located at the end of the two straight sections, and the overall shape of the hollow fiber bundle 20 is also U-shaped, with part extending axially and part bending along the turning section of the cylinder 10.The hollow fiber bundle 20 includes a plurality of hollow fiber membranes that at least partially extend axially, at least one end of the hollow fiber membranes is open and located at the port 13, and in communication with the port 13.In general, if the cylinder 10 has two ports 13, the two ends of the hollow fiber membranes extend to the corresponding ports 13 respectively, and the interior of the hollow fiber membranes is in communication with the ports 13;If the cylinder 10 has one port 13, one end of the hollow fiber membranes extends to the port 13, and the interior of the hollow fiber membranes is in communication with the port 13.For convenience of description, the axial direction of each embodiment of the utility model is the axial direction of the cylinder 10, hereinafter referred to as the axial direction.

[0041] In the present embodiment, as shown in Figure 1 The port 13 is provided at the axial both ends of the cylinder 10, and an end cover 30 is further fixed at each port 13 to fix the hollow fiber bundle 20, and the hollow fiber bundle 20, the end cover 30, the port 13 and the cylinder 10 are coaxially arranged.The end cover 30 includes an inner surface 32, an outer surface 31 and a slot 33 axially penetrating the inner surface 32 and the outer surface 31, so as to separate the hollow fiber bundle 20 into a plurality of hollow fiber sub-bundles 21, and at least one end of the hollow fiber sub-bundle 21 is correspondingly arranged in the slot 33 and forms a sealing position with the inner circumferential surface of the slot 33 to separate the side mouth 12 and the port 13.In some embodiments, the slot 33 is an open slot, and the corresponding end cover 30 is a radial structure, which forms the sealing position together with the inner wall of the cylinder 10;In another embodiment, the slot 33 is a closed slot, which surrounds the end of the hollow fiber sub-bundle 21.As preferred, in the embodiment shown in Figure 5 The slot 33 is a closed slot.

[0042] The process of forming the sealing position of the hollow fiber bundle 21 and the slot 33 can be formed by any process known to those skilled in the art, such as centrifugal filling or adhesive method. In the present embodiment, the process by centrifugal filling is as follows: (1) After the end cap 30 is fixedly connected with the barrel 10, the pre-processed hollow fibers are divided into a plurality of hollow fiber bundles 21 corresponding to the slots 33;

[0043] (2) One end of each hollow fiber bundle 21 is placed into the slot 33 at one end, and the other end of the hollow fiber bundle 21 is sequentially inserted into the slot 33 at the other end of the inner cavity 11;

[0044] (3) One end of the barrel 10 is fixedly connected with the centrifugal device as the rotation point, and the filling adhesive (the filling adhesive can be epoxy resin or other curing agent commonly used in hollow fiber membrane filling process) is injected into the port 13 at the other end under the centrifugal force, and at the same time, the filling adhesive flows into each slot 33, so that the filling adhesive fills the slot 33 under the centrifugal force, the filling adhesive is bonded with each hollow fiber membrane in the hollow fiber bundle 21, and also bonded with the side wall of the slot 33, and after the filling adhesive is cured, the sealing position is formed; then the two ends of the barrel 10 are exchanged to form the sealing position at the other end;

[0045] (4) The outer side surface of the sealing position is cut along the radial direction to be flush with the outer surface 31 of the end cap 30, and the hollow fiber membrane inside the outer surface 31 of the end cap 30 is checked to be in communication with the outside (i.e. the hollow fiber membrane inside is not blocked by the filling adhesive), which meets the requirements.

[0046] In addition, the hollow fiber filter assembly further comprises a sealing area 34 formed on the side of the inner surface 32 of the end cover 30, the sealing area 34 is located between the sealing position and the side opening 12 in the axial direction, and extends radially and forms a circumferential sealing connection between the plurality of hollow fiber bundles 21, so that the inner surface 32 of the end cover 30 is isolated from the inner cavity 11. The sealing position and the sealing area 34 are connected to each other, and are both formed by the potting glue through the potting process; the potting glue of the sealing area 34 fully covers the inner surface 32 of the end cover 30 without any gap, forming a continuously extending sealing surface that fully covers the bonding gap and reduces the retention of the feed liquid; at the same time, the sealing area 34 circumferentially connects and seals the plurality of hollow fiber bundles 21; the sealing surface of the sealing area 34 is the final sealing surface, and the inner surface of the end cover 30 is fully covered, so that the feed liquid only directly impacts the sealing surface at the end of the sealing area 34, thereby avoiding the sealing position and the sealing connection between the inner surface of the end cover 30 from being cracked by the impact of the feed liquid, which affects the sealing effect of the sealing position; the sealing area 34 and the sealing position cooperate to not only improve the sealing performance and connection firmness of the end of the hollow fiber bundle 21, but also fix the position of the hollow fiber bundle 21, which is beneficial to reducing the influence of the shaking of the hollow fiber bundle 21 on the filtration process; and can form a relatively continuous sealing surface on the side of the end of the hollow fiber bundle 21 close to the inside of the cylinder 10, avoiding the bonding gap between the potting glue and the inner surface of the hollow fiber membrane and the insertion slot 33 to form a dead angle and cause the retention of the feed liquid.

[0047] The sealing position and the sealing area 34 can be formed in sequence and bonded together by the potting glue; or can be integrally formed, that is, the sealing position and the sealing area 34 are an integral structure, that is, are simultaneously solidified by the potting glue during potting, and the integral structure has higher mechanical strength and connection strength, and the sealing position and the sealing area 34 are not easy to separate, and have better fixing and sealing effects on the hollow fiber bundle 21.

[0048] As Figure 2 and Figure 3In the shown embodiment, the cylinder body 10 is provided with two side openings 12 and two end openings 13, one of the side openings 12 is used as the liquid inlet, and the other side opening is used as the liquid outlet, and the two end openings 13 are both filtrate outlets. When the feed liquid flows into or out of the side opening 12, the hollow fiber bundles 21 close to the side opening 12 are subjected to radial flow impact and deformed or bent, which changes the size of the flow-through gap between the hollow fiber bundles 21. Excessive bending of the hollow fiber membrane filaments may cause damage to the membrane filaments. Therefore, the inner cavity 11 is provided with a baffle 40, the baffle 40 extends axially and surrounds all the hollow fiber bundles 21, the radial projection of the baffle 40 covers the side opening 12, and the baffle 40 is provided with a passage for the flow of the feed liquid. The feed liquid can only contact the hollow fiber bundles 21 through the passage on the baffle 40, avoiding direct impact of the feed liquid on the hollow fiber bundles 21, greatly reducing the impact of the feed liquid on the hollow fiber bundles 21, and improving the stability of the position of the hollow fiber bundles 21, so as to facilitate the stability of the size of the flow-through gap, reduce the superposition or aggregation of the hollow fiber bundles 21 and the flow-through gap due to the external force of the feed liquid, and thus facilitate the change of the spacing between the membrane filaments of the hollow fiber bundles 21 to be small, so that the feed liquid can fully contact each hollow fiber bundle 21, and the filtration efficiency is high.

[0049] In some embodiments, the baffle 40 is a split structure including a plurality of split plates, and the passage is a gap between adjacent split plates. The split structure has higher adaptability and can be adapted to different sizes of the cylinder body 10. The gap between adjacent baffle plates 40 can be adjusted according to the flow rate of the feed liquid to adjust the amount of feed liquid flowing through the passage, so as to avoid the flow rate of the feed liquid in the inner cavity 11 being too slow and affecting the filtration efficiency.

[0050] Preferably, the baffle 40 in the embodiment is an integral structure, and the passage is a flow-through hole 42 formed on the baffle 40. The baffle 40 has high mechanical strength and high stability in the inner cavity 11, and has better protection effect on the hollow fiber bundle 20. The flow-through hole 42 on the baffle 40 connects the side opening 12 and the outer peripheral space of the hollow fiber membrane filaments, so as to ensure that the feed liquid can fully contact and filter the hollow fiber membrane filaments.

[0051] The end of the baffle 40 is fixedly connected with the end cover 30 located on the same side in the axial direction. Specifically, the end cover 30 is cylindrical, and an end thereof facing the baffle 40 is provided with a receiving groove. The axial end of the baffle 40 is fixedly connected with the receiving groove. Meanwhile, the axially extending baffle 40 can assist in positioning the two end covers 30. The outer edge of the end cover 30 is fixedly connected with the baffle 40 through the receiving groove, which improves the stability of the end cover 30 and the firmness of the connection between the end cover 30 and the inner wall of the cylinder body 10, and is also conducive to improving the stability of the flow-through gap between the hollow fiber bundles 21.

[0052] As Figure 2As shown, the baffle plate 40 is provided with a plurality of passages, i.e. a plurality of flow-through holes 42 in the axial and circumferential directions, the flow-through holes 42 penetrating the baffle plate 40 in the radial direction, and the flow-through holes 42 are spaced apart so that the feed liquid at the outer periphery of the baffle plate 40 can flow into the inside of the baffle plate 40 from various directions and heights to contact and filter the hollow fiber membrane filaments. At least one passage is located between the sealing area 34 and the side opening 12 in the axial direction, which is defined as a first passage 41. As shown, Figure 2 In the present embodiment, four first passages 41 are located between the sealing area 34 and the side opening 12 in the axial direction and are uniformly spaced apart in the circumferential direction.

[0053] The axial minimum distance of the first passage 41 to the sealing area 34 is L1, and the axial minimum distance of the first passage 41 to the side opening 12 is L2, which satisfies L1 / L2 = 0.02-0.15. The axial minimum distance of the first passage 41 to the sealing area 34 is the axial distance L1 of the first passage 41 to the sealing surface of the sealing area 34 towards the inside of the cylinder body 10, and the axial minimum distance of the first passage 41 to the side opening 12 is the axial distance L2 of the first passage 41 to the side opening 12. Controlling the ratio of the two within the above range makes the distance between the first passage 41 and the sealing area 34 moderate, so that there is no large stagnant area, and the feed liquid entering the hollow fiber membrane filaments through the first passage 41 can still maintain a certain flow rate and disperse quickly. It also takes into account the area of the hollow fiber membrane filaments close to the sealing area 34, improves the utilization rate of the hollow fiber membrane filaments, and the axial distance of the feed liquid exchange between the first passage 41 and the side opening 12 is short, which is beneficial to the rapid exchange of the feed liquid between the first passage 41 and the side opening 12, and promotes the transfer efficiency of the feed liquid. At the same time, even if the sealing area 34 slightly exceeds the preset position due to the defects of the pouring sealing process, the first passage 41 still has a certain axial distance from the sealing area 34, and will not block the first passage 41, and even the axial distance between the first passage 41 and the sealing area 34 can be shortened, so that the feed liquid can contact and filter more hollow fiber membrane filaments more quickly. If the ratio of the two is too large, the first passage 41 is relatively close to the side opening 12, and the axial distance to the sealing area 34 is too large. The hollow fiber membrane filaments in this part of the inner cavity 11 are relatively close to the end portion fixed by the sealing area 34, and are arranged relatively closely. The hindering effect on the feed liquid is obvious, and a large stagnant area is easily formed, which affects the rapid distribution of the feed liquid between the hollow fiber membrane filaments, or causes feed liquid residue, cleaning difficulty, and other defects affecting subsequent use. If the ratio of the two is too small, the first passage 41 is too close to the sealing area 34. The sealing area 34 is formed by curing the pouring sealant, which has certain uncontrollability. If there is a process error, the pouring sealant will block the first passage 41, forming a larger stagnant area and reducing the exchange and flow efficiency of the feed liquid.

[0054] As shown, Figure 3 and Figure 4As shown, at least one channel is located axially between the sealing area 34 and the side opening 12, defined as a first channel 41, the axial minimum distance of the first channel 41 to the sealing area 34 is L1, the maximum axial thickness of the sealing area 34 is D, satisfying D / L1 = 0.2-2; controlling the ratio of the two within the above range can ensure the axial thickness of the sealing area 34, so that the sealing area 34 is radially continuous with the hollow fiber membrane and completely covers the sealing connection between the sealing area 34 and the inner surface 32 of the end cover 30, and the sealing area 34 has high strength and is not easy to break, and the sealing effect is good, and the pouring sealant is also avoided from blocking the first channel 41. If the ratio of the two is too small, the maximum axial thickness of the sealing area 34 is too small, which may cause the sealing area 34 to break and affect the sealing effect, forming a new material liquid retention area; if the ratio of the two is too large, the maximum axial thickness of the sealing area 34 is too large, and the distance between the sealing area 34 and the first channel 41 is also too close. The sealing area 34 is formed by pouring sealant and has certain uncontrollability. If process errors occur, the pouring sealant will block the first channel 41, so that the material liquid cannot pass through, forming a larger retention area, reducing the material liquid exchange and flow efficiency.

[0055] Preferably, as shown in the drawings, Figure 2 As shown, the baffle 40 and the adjacent hollow fiber small bundle 21 form a sealing joint 43 therebetween, which extends radially and is connected integrally with the sealing area 34 to improve the stability of the baffle 40 inside the barrel 10; the sealing joint 43 can be formed by curing an adhesive pre-applied on the inner wall of the baffle 40, which connects the baffle 40 and the adjacent hollow fiber small bundle 21.

[0056] In some preferred embodiments, the outer periphery of the hollow fiber small bundle 21 is surrounded by a connecting net (not shown), which extends axially and is connected with the sealing area 34 and the sealing site; the connecting net functions to cover the hollow fiber small bundle 21 to avoid it from shaking with the material liquid flow, and in addition, the connecting net can serve as a supporting component in the sealing area 34 and the sealing site to improve the structural strength of the sealing area 34 and the sealing site.

[0057] In some embodiments, the end cover 30 is arranged only at the first end 22 of the hollow fiber small bundle 21, therefore, the sealing site only includes the first sealing site 24, the axial thickness of the first sealing site 24 is P1, and the axial length of the end of the connecting net connected with the first sealing site 24 in the first sealing site 24 is Q1, satisfying Q1 / P1 = 0.2-0.8.

[0058] In other embodiments, the end cover 30 is arranged only at the second end 23 of the hollow fiber small bundle 21, therefore, the sealing site only includes the second sealing site 25; the axial thickness of the second sealing site 25 is P2, and the axial length of the end of the connecting net connected with the second sealing site 25 in the second sealing site 25 is Q2, satisfying Q2 / P2 = 0.2-0.8.

[0059] In some other embodiments, the end cap 30 is two, corresponding to the first end 22 and the second end 23 of the hollow fiber bundle 21 respectively, and the sealing position includes a first sealing position 24 and a second sealing position 25; the axial thickness of the first sealing position 24 is P1, the axial length of the end of the connecting net connected with the first sealing position 24 in the first sealing position 24 is Q1, and Q1 / P1 = 0.2-0.8 is met; the axial thickness of the second sealing position 25 is P2, the axial length of the end of the connecting net connected with the second sealing position 25 in the second sealing position 25 is Q2, and Q2 / P2 = 0.2-0.8 is met.

[0060] Q1 and Q2 respectively represent the axial length of the connecting net into the first sealing position 24 and the second sealing position 25, and the value of Q2 / P2 reflects the axial length of the connecting net into the second sealing position 25; if the ratio is too large, the end of the connecting net is too close to the outer surface 31 of the first sealing position 24 or the second sealing position 25, and if a small amount of damage occurs in the first sealing position 24 or the second sealing position 25, the first sealing position 24 or the second sealing position 25 itself may not be sealed, but the liquid may leak through the connecting net, resulting in sealing failure; if the ratio is too small, the connecting net is not easy to be fixed to the first sealing position 24 and the sealing area 34 on the same side or the second sealing position 25 and the sealing area 34 on the same side, and the connecting net is easy to be separated from the first sealing position 24 and the sealing area 34 on the same side or the second sealing position 25 and the sealing area 34 on the same side, and it is difficult to play a supporting and connecting role.

[0061] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. A hollow fiber filter assembly, comprising: A cylindrical body includes an axially extending inner cavity, a side opening communicating with the inner cavity, and a port, wherein the port is close to the end of the cylindrical body and the side opening is located on the side of the cylindrical body; A hollow fiber bundle is located in the inner cavity and extends at least partially axially. The hollow fiber bundle includes a plurality of hollow fiber membrane filaments that extend at least partially axially. At least one end of each hollow fiber membrane filament is open and communicates with the port. Its characteristic is that it further includes: An end cap is fixed at the port. The end cap includes an inner surface, an outer surface, and a slot that axially penetrates the inner and outer surfaces to separate the hollow fiber bundle into multiple small hollow fiber bundles. At least one end of each small hollow fiber bundle is correspondingly disposed in the slot and forms a sealing position with the inner circumferential surface of the slot to separate the side opening from the port. It also includes a sealing area disposed on the inner surface side of the end cap, the sealing area being located axially between the sealing position and the side opening, and extending radially to form a circumferential sealing connection between the plurality of hollow fiber bundles, thereby isolating the inner surface of the end cap from the inner cavity.

2. The hollow fiber filter assembly as described in claim 1, characterized in that, The inner cavity is provided with a baffle that extends axially and surrounds all the hollow fiber bundles. The radial projection of the baffle covers the side opening, and the baffle is provided with a channel for the flow of the feed liquid.

3. The hollow fiber filter assembly as described in claim 2, characterized in that, The baffle is an integral structure, and the channel is a flow hole formed on the baffle; or, the baffle is a split structure, including several sub-plates, and the channel is a break between adjacent sub-plates.

4. The hollow fiber filter assembly as described in claim 2, characterized in that, The end of the baffle is fixedly connected to the end cap located on the same side of the axial direction.

5. The hollow fiber filter assembly as described in claim 2, characterized in that, At least one of the channels is located axially between the sealing area and the side opening, and is defined as a first channel. The minimum axial distance from the first channel to the sealing area is L1, and the minimum axial distance from the first channel to the side opening is L2, satisfying L1 / L2 = 0.02-0.

15.

6. The hollow fiber filter assembly as described in claim 2, characterized in that, At least one of the channels is located axially between the sealing area and the side opening, and is defined as a first channel. The minimum axial distance from the first channel to the sealing area is L1, and the maximum axial thickness of the sealing area is D, satisfying that D / L1 = 0.2-2.

7. The hollow fiber filter assembly as described in claim 2, characterized in that, A sealing joint is formed between the baffle and the adjacent hollow fiber bundle, the sealing joint extending radially and integrated with the sealing area.

8. The hollow fiber filter assembly as described in claim 1, characterized in that, The hollow fiber bundle is surrounded by a connecting mesh, which extends axially and connects to the sealing area and the sealing position.

9. The hollow fiber filter assembly as described in claim 8, characterized in that, The first end of the hollow fiber bundle corresponds to the slot of the end cap to form a first sealing position. The connecting mesh extends axially and one end is connected to the first sealing position. The axial thickness of the first sealing position is P1, and the axial length of the end of the connecting mesh connected to the first sealing position in the first sealing position is Q1, satisfying that Q1 / P1=0.2-0.

8. And / or, The number of ports is two, located at both ends of the cylinder. The number of end caps is two, each corresponding to one of the ports. The second end of the hollow fiber bundle corresponds to the slot of the other end cap to form a second sealing position. The connecting mesh extends axially, with one end connected to the second sealing position. The axial thickness of the second sealing position is P2, and the axial length of the end of the connecting mesh connected to the second sealing position in the second sealing position is Q2, satisfying Q2 / P2=0.2-0.

8.

10. The hollow fiber filter assembly as described in claim 8, characterized in that, The sealing position and the sealing area are an integral structure.

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