Screen and ultrafiltration membrane package

Abstract

The utility model relates to biological filtration technical field discloses screen cloth and ultrafiltration membrane package, including main stem unit and branch unit, the utility model discloses a main stem unit and including first grade shunt and branch shunt branch unit are set up, and the direction along main entrance to main export is limited, and the width height size of main stem unit's main stream passage cross section gradually reduces. Based on this, the degree of the fluid concentration polarization of the fluid to be filtered is reduced, and the smoothness of the filter medium is improved. After the fluid to be filtered passes through the main outlet, it is dispersed into the branch shunt, and finally filtered through the filter medium. The fluid to be filtered is divided into two parts after passing through the screen cloth with the shape of tree leaf veins, so as to disperse the fluid pressure of the fluid to be filtered. The situation that more concentrated solute is pushed to the membrane surface due to the "drag effect" in the related art is avoided, thereby achieving the technical effect of improving the reliability of the smoothness of the screen cloth and the filter medium.

Description

Technical Field

[0001] This utility model relates to the field of biological filtration technology, specifically to sieves and ultrafiltration membrane packs. Background Technology

[0002] Ultrafiltration membrane packs are filtration devices used in biological and biopharmaceutical processes, and are particularly suitable for the purification and concentration of biological products.

[0003] The ultrafiltration membrane package includes screens and filter membranes that are stacked alternately along the height direction. Both the screens and filter membranes extend in a direction parallel to the ground, and one of the adjacent screens serves as the inlet screen and the other as the outlet screen.

[0004] Furthermore, both the screen and the filter membrane are provided with an inlet groove and an outlet groove. The inlet groove of the screen is connected to the inlet groove of the filter membrane to form an inlet channel, and the outlet groove of the screen is connected to the outlet groove of the filter membrane to form an outlet channel. The end of the inlet screen connected to the outlet channel is provided with a first blocking structure, and the end of the outlet screen connected to the inlet channel is provided with a second blocking structure.

[0005] Specifically, under the constraints of the first and second blocking structures, the fluid is conducted from the inlet screen to the filter membrane. After being filtered by the filter membrane, the fluid flows out sequentially through the outlet screen and the outlet channel, thus completing the filtration process.

[0006] The screen is a cuboid with a filter chamber inside for the fluid to pass through. The cross-sectional dimensions of the inlet of the filter chamber are much larger than those of the outlet. In other words, the dimensions of the interface between the filter chamber and the inlet channel are much larger than those between the filter chamber and the outlet channel. This allows the viscous solute inside the fluid to adhere to the inner wall of the screen during the flow of the fluid through the filter chamber, enhancing the fluidity of the remaining fluid and preventing the viscous solute from clogging the filter membrane and causing it to fail to filter properly.

[0007] However, in actual use, the significant size difference between the inlet and outlet causes the fluid pressure to drive the concentrated solute to move rapidly to the outlet. This results in shear force on the ultrafiltration membrane surface due to the high-speed fluid flow, which theoretically can reduce concentration polarization. However, when the solute is viscous and the outlet flow rate is extremely high, the shear force may be insufficient to disperse the solute aggregation. Instead, the "dragging effect" may push more viscous solute to the membrane surface, causing blockage of the ultrafiltration membrane and affecting its normal operation. Utility Model Content

[0008] In view of this, the present invention provides a screen and an ultrafiltration membrane pack to solve the problem that, in actual use, the significant size difference between the inlet and outlet causes fluid pressure to drive concentrated solutes to move rapidly to the outlet, resulting in shear force generated on the ultrafiltration membrane surface by the high-speed flowing fluid, which theoretically can reduce concentration polarization. However, when the solute is viscous and the outlet flow rate is extremely high, the shear force may be insufficient to disperse the solute aggregation. Instead, the "dragging effect" may push more viscous solute to the membrane surface, causing blockage of the ultrafiltration membrane and affecting its normal use.

[0009] In a first aspect, this utility model provides a sieve, comprising:

[0010] The main unit is provided with a main channel. The main unit is provided with a main inlet and multiple main outlets that are connected to the main channel. Along the direction from the main inlet to the main outlet, the width and height dimensions of the cross-section of the main channel gradually decrease.

[0011] The branch unit includes a first-stage diversion channel and branch channels; the first-stage diversion channel is provided in multiple ways, the first inlet of the first-stage diversion channel is connected to the main outlet, the first outlet of each first-stage diversion channel is connected to the second inlet of at least two of the branch channels, the second outlet of each branch channel is connected to the filter medium, and the branch channels are used to disperse the fluid pressure of the fluid to be filtered flowing out of the main outlet.

[0012] Beneficial effects: By setting up a main unit and branch units including a first-stage diversion channel and branch channels, and defining the direction from the main inlet to the main outlet of the main unit, the width and height dimensions of the main channel cross-section of the main unit gradually decrease. This allows the fluid to be filtered entering from the main inlet to flow out quickly through the main outlet, increasing the flow velocity of the fluid to be filtered. Furthermore, during the flow of the fluid to be filtered in the main channel, viscous solutes can adhere to the inner wall of the main unit, reducing the viscosity of the fluid and preventing the clogging of the filter media caused by excessively viscous fluid, as is common in related technologies. In other words, the main unit increases the shear force of the fluid to be filtered, thereby reducing the degree of concentration polarization and improving the smoothness of the filter media. The viscous solutes on the inner wall of the main unit can also flow with the scouring of the fluid to be filtered, achieving simultaneous scouring and adhesion of viscous solutes. This not only prevents clogging of the main channel but also ensures that the fluid to be filtered does not clog the filter media, thus achieving the technical effect of improving the smoothness of the screen and filter media.

[0013] Furthermore, the fluid to be filtered is dispersed into the branch channels after passing through the main outlet, and finally filtered by the filter medium. In this embodiment, the fluid to be filtered is diverted after passing through the leaf vein-like forked screen formed by the main unit and branch units, thereby dispersing the fluid pressure. This not only avoids the situation in related technologies where more concentrated solute is pushed to the membrane surface due to the "dragging effect," but also reduces the degree of concentration polarization, reduces the risk of clogging of the screen and filter medium, and thus achieves the technical effect of improving the reliability of the screen and filter medium flow.

[0014] In one optional embodiment, the branch flow channel includes a second-level branch flow channel and a third-level branch flow channel; each of the second-level branch flow channels and the third-level branch flow channels is provided with multiple third inlets, each of the second-level branch flow channels having a third inlet serving as a second inlet of the branch flow channel, at least two of the third inlets being connected to a first outlet of the first-level branch flow channel, each of the second-level branch flow channels having a third outlet being connected to at least two of the fourth inlets of the third-level branch flow channels, and each of the third-level branch flow channels having a fourth outlet serving as a second outlet of the branch flow channel being connected to the filter medium.

[0015] Beneficial effects: By increasing the number of branch channels, the fluid pressure of the fluid to be filtered is further dispersed, thereby improving the reliability of the screen and filter media.

[0016] In one alternative embodiment, the fluid to be filtered flows along the main inlet, the main outlet, the first inlet, the first outlet, the third inlet, the third outlet, the fourth inlet, and the fourth outlet, and the width and height dimensions of the cross-section of the main channel, the first-stage branch channel, the second-stage branch channel, and the third-stage branch channel gradually decrease.

[0017] Beneficial effects: As the cross-sectional dimensions of the main channel, first-stage branch channel, second-stage branch channel, and sub-channel gradually decrease, the inner walls of these channels can apply pressure to the fluid being filtered. This improves the smoothness of the fluid's flow and increases its shear force, further enhancing its passage through the filter media. Simultaneously, as the liquid flows towards the fourth outlet, the concentration of viscous solutes in the fluid gradually decreases. Even with the decreasing dimensions of the main channel, first-stage branch channel, and sub-channel, the fluid will not clog the screen or filter media, thus improving the protection of the screen and filter media.

[0018] In one optional embodiment, the width of the cross-section of the main channel is 0.5 mm;

[0019] And / or, the width of the cross-section of the first-stage diversion channel is 0.4 mm;

[0020] And / or, the width of the cross-section of the second-stage diversion channel is 0.3 mm;

[0021] And / or, the width of the cross-section of the third-stage diversion channel is 0.2 mm.

[0022] In one optional implementation, the main outlet and the first-stage diversion channel are provided with eight, the second-stage diversion channel is provided with sixteen, and the third diversion channel is provided with thirty-two;

[0023] The main outlet is connected to the first inlet, each of the first outlets is connected to the two third inlets, and each of the third outlets is connected to the two fourth inlets.

[0024] In one alternative implementation, the main entrance is provided in multiple locations.

[0025] Beneficial effects: By limiting the number of main inlets, the number of points where the liquid to be filtered enters the screen can be increased, thereby increasing the speed at which the fluid to be filtered enters the screen and thus achieving the technical effect of accelerating the filtration speed.

[0026] In one alternative embodiment, the trunk unit and / or the branch unit are made of one or more combinations of polypropylene, polyethylene, and polystyrene.

[0027] In one optional embodiment, the main unit and the branch unit have tensile strength not less than 200 N / m. 2 .

[0028] Beneficial effect: By limiting the tensile strength of the main unit and the branch unit, the main unit and the branch unit can be stretched as needed during the processing.

[0029] Secondly, this utility model also provides an ultrafiltration membrane package, including the screen and ultrafiltration membrane described above; the screen and the ultrafiltration membrane are stacked alternately, and the screen and the ultrafiltration membrane are provided with an inlet channel and an outlet channel, and the inlet channel and the outlet channel are sealed on the side away from the screen;

[0030] In the adjacent screens, one screen is a liquid inlet screen and the other is a liquid outlet screen. The main inlet of the liquid inlet screen is connected to the liquid inlet channel, and the second outlet of the liquid inlet screen is blocked from the liquid outlet channel. The main inlet of the liquid outlet screen is blocked from the liquid inlet channel, and the second outlet of the liquid outlet screen is connected to the liquid outlet channel. This allows the fluid to be filtered to pass through the liquid inlet channel, then sequentially through the liquid inlet screen, the ultrafiltration membrane, and the liquid outlet screen, completing the filtration process before flowing out through the liquid outlet channel.

[0031] Beneficial effects: Under the pressure of the fluid to be filtered, it flows into the inlet screen. The inner wall of the inlet screen is coated with viscous solutes from the fluid to be filtered, ensuring that only a small amount of viscous solute remains in the fluid passing through the ultrafiltration membrane. This improves the smoothness of the fluid flow into the ultrafiltration membrane, preventing clogging and ensuring the reliability of the ultrafiltration membrane's normal operation. Simultaneously, the viscous solutes on the inner wall of the screen flow with the fluid to be filtered, achieving simultaneous flushing and adhesion of the viscous solutes. This not only prevents screen clogging but also ensures that the fluid to be filtered does not clog the filter media, thereby improving the smooth operation of the ultrafiltration membrane pack.

[0032] The fluid filtered through the ultrafiltration membrane passes through the effluent screen into the effluent channel, and then flows out of the filter membrane pack, completing the filtration process. Simultaneously, the filtered fluid flowing out of the effluent channel can be collected for research purposes.

[0033] In one alternative embodiment, the size of the inlet channel is larger than the size of the outlet channel.

[0034] Beneficial effects: By limiting the size of the inlet channel to be larger than that of the outlet channel, the shear force of the liquid to be filtered within the larger inlet channel is reduced. This prevents clogging or even damage to the ultrafiltration membrane by concentrated solutes in the fluid that have not yet flowed through the inlet screen. Simultaneously, it increases the shear force of the filtered fluid within the outlet channel, thereby increasing the fluid flow velocity and ultimately improving the filtration speed of the ultrafiltration membrane. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the sieve structure in this embodiment;

[0037] Figure 2 This is a schematic diagram of the fluid flow direction of the screen in this embodiment;

[0038] Figure 3 This is a cross-sectional schematic diagram of the feed screen in the ultrafiltration membrane pack of this embodiment;

[0039] Figure 4 This is an exploded cross-sectional view of the effluent screen and the ultrafiltration membrane in the ultrafiltration membrane pack of this embodiment;

[0040] Figure 5 This is a cross-sectional schematic diagram of the effluent screen and the ultrafiltration membrane in the ultrafiltration membrane pack of this embodiment;

[0041] Figure 6 This is an exploded cross-sectional view of the effluent screen, influent screen, and ultrafiltration membrane in the ultrafiltration membrane package of this embodiment;

[0042] Figure 7 This is a cross-sectional schematic diagram of the ultrafiltration membrane pack in this embodiment.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Main unit;

[0045] 2. Branching unit; 201. First-level branch channel; 202. Branch channel; 2021. Second-level branch channel; 2022. Third-level branch channel;

[0046] 3. Ultrafiltration membrane; 4. Inlet channel; 5. Outlet channel; 6. Inlet screen; 7. Outlet screen; 8. First barrier structure; 9. Second barrier structure; 10. Third barrier structure. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0049] According to an embodiment of the present invention, in one aspect, a sieve is provided, comprising:

[0050] Main unit 1 is provided with a main channel. Main unit 1 is provided with a main inlet and multiple main outlets connected to the main channel. Along the direction from the main inlet to the main outlet, the width and height of the cross-section of the main channel gradually decrease.

[0051] Branch unit 2 includes a first-stage diversion channel 201 and a branch channel 202; the first-stage diversion channel 201 is provided in multiple ways, the first inlet of the first-stage diversion channel 201 is connected to the main outlet, the first outlet of each first-stage diversion channel 201 is connected to the second inlet of at least two branch channels 202, the second outlet of each branch channel 202 is connected to the filter medium, and the branch channels 202 are used to disperse the fluid pressure of the fluid to be filtered flowing out of the main outlet.

[0052] In the screen of this embodiment, by setting a main unit 1 and a branch unit 2 including a first-stage diversion channel 201 and a branch channel 202, and defining the direction from the main inlet to the main outlet of the main unit 1, the width and height dimensions of the main channel cross-section of the main unit 1 gradually decrease. This allows the fluid to be filtered entering from the main inlet to flow out quickly through the main outlet, increasing the flow velocity of the fluid to be filtered. Furthermore, during the flow of the fluid to be filtered in the main channel, concentrated solutes in the fluid to be filtered can adhere to the inner wall of the main unit 1, reducing the filtration rate. The viscosity of the filtration fluid is adjusted to avoid clogging of the filter media due to excessive viscosity, as is the case in related technologies. This is achieved by increasing the shear force of the filtration fluid through the main unit 1, thereby reducing the degree of concentration polarization and improving the smoothness of the filter media. Furthermore, the viscous solute on the inner wall of the main unit 1 can flow along with the filtration fluid, allowing the viscous solute to adhere to the wall while being filtrationd. This not only prevents clogging of the main channel but also ensures that the filtration fluid does not clog the filter media, thus achieving the technical effect of improving the smoothness of the screen and filter media.

[0053] Furthermore, the fluid to be filtered is dispersed into the branch channel 202 after passing through the main outlet, and finally filtered by the filter medium. In this embodiment, the fluid to be filtered is diverted after passing through the leaf vein-like forked screen formed by the main unit 1 and the branch unit 2, thereby dispersing the fluid pressure. This not only avoids the situation in related technologies where more concentrated solute is pushed to the membrane surface due to the "dragging effect", but also reduces the degree of concentration polarization and the risk of clogging of the screen and filter medium, thus achieving the technical effect of improving the reliability of the screen and filter medium.

[0054] Preferably, the screen is not used to filter the fluid, but rather as a channel to guide the fluid to the filter medium.

[0055] Furthermore, both the main unit 1 and the branch unit 2 are made of one or more combinations of polypropylene, polyethylene, and polystyrene. For example, in this embodiment, both the main unit 1 and the branch unit 2 are made of polypropylene.

[0056] Furthermore, the main unit 1 and the branch unit 2 possess tensile strength, which is 200 N / m. 2 This allows the main unit 1 and branch unit 2 to be stretched as needed during the processing.

[0057] As an alternative implementation, the materials of the main unit 1 and the branch unit 2 can be adjusted; the materials used for the main unit 1 and the branch unit 2 can be the same or different. Alternatively, the range of tensile strength of the main unit 1 and the branch unit 2 can be adjusted; for cost considerations, the tensile strength of the main unit 1 and the branch unit 2 can be no less than 200 N / m. 2 Not exceeding 400 N / m 2 Furthermore, the tensile strength of the main unit 1 can be the same as or different from that of the branch unit 2; no further restrictions are imposed here.

[0058] Of course, in other embodiments, the materials of the main unit 1 and the branch unit 2 can be adjusted depending on the design of the screen. Alternatively, the tensile strength of the main unit 1 and the branch unit 2 can be adjusted depending on the design of the screen.

[0059] In this embodiment, the filter medium is an ultrafiltration membrane 3. Of course, in other embodiments, the type of filter medium can be adjusted depending on the application scenario of the screen. Furthermore, the type of fluid to be filtered is not specifically limited; the screen and filter medium can filter and concentrate solutions containing monoclonal antibodies, albumin, hormones, vaccines, and growth factors.

[0060] In addition, combined Figure 1 and Figure 2 As shown, in this embodiment, the branch channel 202 includes a second-level branch channel 2021 and a third-level branch channel 2022; both the second-level branch channel 2021 and the third-level branch channel 2022 are provided in multiples, the third inlet of each second-level branch channel 2021 serves as the second inlet of the branch channel 202, at least two third inlets are connected to the first outlet of the first-level branch channel 201, the third outlet of each second-level branch channel 2021 is connected to at least two fourth inlets of the third-level branch channels 2022, and the fourth outlet of each third-level branch channel 2022 serves as the second outlet of the branch channel 202 and is connected to the filter medium.

[0061] Based on this, the number of branch channels 202 can be increased, thereby further dispersing the fluid pressure of the fluid to be filtered, and thus achieving the technical effect of improving the reliability of the screen and filter media flow.

[0062] In this embodiment, the first outlet of each first-level diversion channel 201 is connected to two third inlets, and each third outlet is connected to two fourth inlets.

[0063] Specifically, in combination Figure 1 As shown, there are eight main outlets and eight first-level branch channels 201, sixteen second-level branch channels 2021, and thirty-two third-level branch channels 2022. The main outlets, first-level branch channels 201, second-level branch channels 2021, and third-level branch channels 2022 are evenly distributed along the main unit 1, that is, the main unit 1 is along... Figure 1 The left side shown has four main outlets and four first-level branch channels 201, eight second-level branch channels 2021, and sixteen third-level branch channels 2022. The main unit 1 is along... Figure 1 The right side is provided with four main outlets and four first-level diversion channels 201, eight second-level diversion channels 2021, and sixteen third-level diversion channels 2022. The main outlets, first-level diversion channels 201, second-level diversion channels 2021, and third-level diversion channels 2022 located on both sides of the main unit 1 can be arranged in a mirror image or staggered, all of which are within the protection scope of this utility model.

[0064] Of course, in other embodiments, the structure of the branch channel 202 can be adjusted according to the required size of the screen. Alternatively, the branch channel 202 may only include the second-level branch channel 2021, or it may include the second-level branch channel 2021, the third-level branch channel 2022, the fourth-level branch channel, or more branch channels, all within the scope of protection of this utility model. Alternatively, depending on the required size of the screen, the main outlet may be connected to the first inlet of at least two first-level branch channels 201.

[0065] In other embodiments, the number of main outlet, first-stage diversion channel 201, second-stage diversion channel 2021 and third-stage diversion channel 2022 are adjusted according to the different screen designs.

[0066] Furthermore, in this embodiment, the fluid to be filtered flows along the main inlet, main outlet, first inlet, first outlet, third inlet, third outlet, fourth inlet, and fourth outlet. The width and height dimensions of the cross-sections of the main channel, the first-stage branch channel 201, the second-stage branch channel 2021, and the third-stage branch channel 2022 gradually decrease. Based on this, as the width and height dimensions of the cross-sections of the main channel, the first-stage branch channel 201, the second-stage branch channel 2021, and the third-stage branch channel 2022 gradually decrease, the inner walls of the cross-sections of the main channel, the first-stage branch channel 201, the second-stage branch channel 2021, and the third-stage branch channel 2022 can apply pressure to the fluid to be filtered. This improves the smoothness of the fluid flow and increases the shear force of the fluid, thereby improving the smoothness of the fluid passing through the filter medium. Meanwhile, as the liquid to be filtered flows toward the fourth outlet, the viscous solute in the fluid to be filtered gradually decreases. Even if the width and height of the main channel, the first-stage branch channel 201 and the branch channel 202 gradually decrease, the fluid to be filtered will not clog the screen or the filter medium, thereby achieving the technical effect of improving the protection of the screen and the filter medium.

[0067] Furthermore, the viscous solute on the inner wall of the branch unit 2 can flow along with the scouring of the fluid to be filtered, so that the viscous solute can be scouring and adhering to the wall at the same time. This not only avoids the blockage of the first-stage diversion channel 201 and the branch channel 202, but also ensures that the fluid to be filtered will not cause blockage to the filter medium, thereby achieving the technical effect of improving the smoothness of the screen and filter medium.

[0068] The cross-section of the main channel refers to the cross-section perpendicular to the axis of the main channel. Similarly, the cross-section of the first-stage branch channel 201 refers to the cross-section perpendicular to the axis of the first-stage branch channel 201, the cross-section of the second-stage branch channel 2021 refers to the cross-section perpendicular to the axis of the second-stage branch channel 2021, and the cross-section of the third-stage branch channel 2022 refers to the cross-section perpendicular to the axis of the third-stage branch channel 2022.

[0069] Preferably, the width of the cross-section of the main channel is 0.5 mm, the width of the cross-section of the first-stage diversion channel 201 is 0.4 mm, the width of the cross-section of the second-stage diversion channel 2021 is 0.3 mm, and the width of the cross-section of the third-stage diversion channel 2022 is 0.2 mm. In this embodiment, the heights of the main channel, the first-stage diversion channel 201, the second-stage diversion channel 2021, and the third-stage diversion channel 2022 are not limited and can be adjusted according to the actual size of the screen, ensuring that the heights of the main channel, the first-stage diversion channel 201, the second-stage diversion channel 2021, and the third-stage diversion channel 2022 decrease sequentially.

[0070] Of course, in other embodiments, the widths of the cross-sections of the main channel, the first-stage diversion channel 201, the second-stage diversion channel 2021, and the third-stage diversion channel 2022 are adjusted according to the different screen designs. Alternatively, the relationship between the width and height dimensions of the cross-sections of the main channel, the first-stage diversion channel 201, the second-stage diversion channel 2021, and the third-stage diversion channel 2022 is adjusted according to the different screen designs.

[0071] Furthermore, in this embodiment, multiple main inlets are provided, which increases the number of points where the liquid to be filtered enters the screen and increases the speed at which the fluid to be filtered enters the screen, thereby achieving the technical effect of accelerating the filtration speed.

[0072] In this configuration, the cross-sectional dimensions (width and height) of each main inlet along the axis perpendicular to the main channel are identical. This design achieves the technical effect of simplifying the processing of the main unit 1.

[0073] As an alternative implementation, there may be only one main entrance. Alternatively, there may be multiple main entrances, each with different cross-sectional dimensions (width and height).

[0074] According to an embodiment of the present invention, another aspect provides an ultrafiltration membrane package, including a screen and an ultrafiltration membrane 3 as described in this embodiment. The screen and the ultrafiltration membrane 3 are stacked alternately, and the screen and the ultrafiltration membrane 3 are provided with an inlet channel 4 and an outlet channel 5, with the inlet channel 4 and the outlet channel 5 sealed on the side away from the screen.

[0075] In the adjacent screens, one screen is the inlet screen 6 and the other is the outlet screen 7. The main inlet of the inlet screen 6 is connected to the inlet channel 4, and the second outlet of the inlet screen 6 is blocked from the outlet channel 5. The main inlet of the outlet screen 7 is blocked from the inlet channel 4, and the second outlet of the outlet screen 7 is connected to the outlet channel 5. This allows the fluid to be filtered to pass through the inlet channel 4, then sequentially through the inlet screen 6, the ultrafiltration membrane 3, and the outlet screen 7, completing the filtration process before flowing out through the outlet channel 5.

[0076] Specifically, the screen can be fixed to the adjacent ultrafiltration membrane 3 by thermal fusion, and the ultrafiltration membrane package can be formed by injection molding without dead volume or dead corners. The fluid to be filtered flows in a tangential flow mode within the screen and ultrafiltration membrane 3, that is, the flow direction of the fluid to be filtered is parallel to the ultrafiltration membrane 3.

[0077] Furthermore, combined Figures 3 to 7The images shown are top views of the ultrafiltration membrane package. The sides of the inlet channel 4 and outlet channel 5 away from the screen can be sealed using a third blocking structure 10. Specifically, the screen and ultrafiltration membrane 3 located at the outer edge of the inlet channel 4 can be sealed by injecting sealant. The side of the inlet screen 6 closest to the outlet channel 5 can be blocked by a first blocking structure 8, i.e., by injecting sealant onto the side of the inlet screen 6 closest to the outlet channel 5. The side of the outlet screen 7 closest to the inlet channel 4 can be blocked by a second blocking structure 9, which can also be sealant; that is, by injecting sealant onto the side of the outlet screen 7 closest to the inlet channel 4, the barrier is applied.

[0078] The fluid to be filtered flows from the inlet channel 4 to the outlet channel 5, entering the inlet screen 6. The inner wall of the inlet screen 6 is coated with a viscous solute from the fluid to be filtered, ensuring that only a small amount of viscous solute remains in the fluid passing through the ultrafiltration membrane 3. This improves the smoothness of the fluid flow into the ultrafiltration membrane 3, preventing clogging and ensuring the reliability of the ultrafiltration membrane 3 during normal use. Simultaneously, the viscous solute on the inner wall of the screen flows with the filtration fluid, allowing it to be flushed and adhered to the wall simultaneously. This not only prevents screen clogging but also ensures that the fluid to be filtered does not clog the filter media, thereby improving the smooth operation of the ultrafiltration membrane pack.

[0079] The fluid filtered through the ultrafiltration membrane 3 enters the outlet channel 5 through the outlet screen 7. Specifically, in conjunction with... Figure 4 As shown by the arrows, the fluid filtered within the ultrafiltration membrane 3 on both sides of the outlet screen 7 flows towards the outlet screen 7 and then through the outlet channel 5 to the outside of the filter membrane, completing the filtration process. Simultaneously, the filtered fluid flowing outside the outlet channel 5 can be collected for research purposes.

[0080] Furthermore, the size of the inlet channel 4 is larger than that of the outlet channel 5. Because of the larger size of the inlet channel 4, the shear force of the liquid to be filtered within it is smaller. This prevents the viscous solute in the fluid that has not flowed through the inlet screen 6 from clogging the ultrafiltration membrane 3, or even damaging it. Simultaneously, it increases the shear force of the filtered fluid within the outlet channel 5, thereby increasing the flow velocity of the fluid within the outlet channel 5, and ultimately improving the filtration speed of the ultrafiltration membrane pack.

[0081] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A sieve, characterized in that, include: The main unit (1) is provided with a main channel. The main unit (1) is provided with a main inlet and multiple main outlets connected to the main channel. Along the direction from the main inlet to the main outlet, the width and height of the cross-section of the main channel gradually decrease. The branch unit (2) includes a first-stage diversion channel (201) and a branch channel (202); the first-stage diversion channel (201) is provided in multiple ways, the first inlet of the first-stage diversion channel (201) is connected to the main outlet, the first outlet of each first-stage diversion channel (201) is connected to the second inlet of at least two of the branch channels (202), the second outlet of each branch channel (202) is connected to the filter medium, and the branch channel (202) is used to disperse the fluid pressure of the fluid to be filtered flowing out of the main outlet.

2. The sieve according to claim 1, characterized in that, The branch channel (202) includes a second-level branch channel (2021) and a third-level branch channel (2022); both the second-level branch channel (2021) and the third-level branch channel (2022) are provided in multiples, the third inlet of each second-level branch channel (2021) serves as the second inlet of the branch channel (202), at least two of the third inlets are connected to the first outlet of the first-level branch channel (201), the third outlet of each second-level branch channel (2021) is connected to at least two of the fourth inlets of the third-level branch channels (2022), and the fourth outlet of each third-level branch channel (2022) serves as the second outlet of the branch channel (202) and is connected to the filter medium.

3. The sieve according to claim 2, characterized in that, The fluid to be filtered flows along the main inlet, the main outlet, the first inlet, the first outlet, the third inlet, the third outlet, the fourth inlet, and the fourth outlet. The width and height dimensions of the cross-sections of the main channel, the first-stage branch channel (201), the second-stage branch channel (2021), and the third-stage branch channel (2022) gradually decrease.

4. The sieve according to claim 3, characterized in that, The width of the cross-section of the main channel is 0.5 mm; And / or, the width of the cross-section of the first-stage diversion channel (201) is 0.4 mm; And / or, the width of the cross-section of the second-stage diversion channel (2021) is 0.3 mm; And / or, the width of the cross-section of the third-stage diversion channel (2022) is 0.2 mm.

5. The sieve according to any one of claims 2-4, characterized in that, The main outlet and the first-level diversion channel (201) are provided with eight, the second-level diversion channel (2021) is provided with sixteen, and the third-level diversion channel (2022) is provided with thirty-two; The main outlet is connected to the first inlet, each of the first outlets is connected to the two third inlets, and each of the third outlets is connected to the two fourth inlets.

6. The sieve according to any one of claims 1-4, characterized in that, There are multiple main entrances.

7. The sieve according to any one of claims 1-4, characterized in that, The main unit (1) and / or the branch unit (2) have tensile strength, which is not less than 200 N / m. 2 .

8. An ultrafiltration membrane pack, characterized in that, Includes a screen and an ultrafiltration membrane (3) as described in any one of claims 1-7; the screen and the ultrafiltration membrane (3) are stacked alternately, and the screen and the ultrafiltration membrane (3) are provided with an inlet channel (4) and an outlet channel (5), and the inlet channel (4) and the outlet channel (5) are sealed on the side away from the screen; In the adjacent screens, one screen is a liquid inlet screen (6) and the other screen is a liquid outlet screen (7). The main inlet of the liquid inlet screen (6) is connected to the liquid inlet channel (4), and the second outlet of the liquid inlet screen (6) is blocked by the liquid outlet channel (5). The main inlet of the liquid outlet screen (7) is blocked by the liquid inlet channel (4), and the second outlet of the liquid outlet screen (7) is connected to the liquid outlet channel (5), so that the fluid to be filtered passes through the liquid inlet channel (4), and then passes through the liquid inlet screen (6), the ultrafiltration membrane (3) and the liquid outlet screen (7) in sequence, and the filtration is completed before flowing out through the liquid outlet channel (5).

9. The ultrafiltration membrane pack according to claim 8, characterized in that, The size of the inlet channel (4) is larger than the size of the outlet channel (5).

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