Filtering membrane bag capable of rapidly feeding liquid

Abstract

The utility model discloses a filtering membrane bag capable of rapidly feeding liquid, which comprises a liquid feeding screen, a filtering membrane layer, a penetrating screen and a rubber coating piece, the liquid feeding screen and the penetrating screen are stacked, the filtering membrane layer is arranged between the liquid feeding screen and the penetrating screen, and the rubber coating piece is arranged between the filtering membrane layer and the penetrating screen. The liquid inlet screen, the filtering membrane layer and the penetrating screen are respectively provided with a liquid inlet, a liquid outlet and a backflow port which are corresponding in position, the liquid inlet screen and the penetrating screen respectively comprise a screen structure formed by weaving fibers in the warp direction and the weft direction, and the included angle between the fibers of the liquid inlet screen and the main flowing direction of the liquid inlet screen is 30-60 degrees. According to the utility model, materials can be quickly diffused along the liquid inlet screen, and the utilization rate of the liquid inlet screen and the filtering membrane layer is improved, so that the filtering efficiency of the materials is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of filter filtration, and particularly relates to a fast liquid-intake filtration membrane package. Background Art

[0002] The filter membrane package is a common tangential flow filtration device, which is composed of a liquid inlet unit, a filter membrane layer, a permeation unit and a shell. The material is distributed on the surface of the filter membrane layer along the horizontal direction parallel to the filter membrane layer through the liquid inlet unit, and is filtered along the direction perpendicular to the filter membrane layer under the action of pressure, and then discharged from the filter membrane package along the horizontal direction parallel to the filter membrane layer under the action of the permeation unit. For example, Chinese patent publication number: CN115608158A discloses a filter membrane package and a preparation method thereof. In the prior art, the liquid inlet guide layer and the liquid outlet guide layer of the filter membrane package need to be arranged in an interlaced and stacked manner through rigid curved surface parts, so as to ensure that the flow channel of the filter membrane package is smooth and the filtration efficiency is maintained during use. However, the rigid curved surface parts are easy to cause damage to the filter membrane layer, and the rigid curved surface parts themselves have a large resistance to the filter membrane package. Since the flow channel direction of the rigid curved surface parts is parallel or perpendicular to the edge of the filter membrane package, when the material flows along the filter membrane package, it will impact with the rigid curved surface parts, resulting in a decrease in the stability of the material, which is not conducive to the diffusion of the material and reduces the liquid inlet efficiency. Utility Model Content

[0003] The utility model provides a fast liquid-intake filtering membrane package, which can make materials diffuse quickly along the liquid-intake screen, improve the utilization rate of the liquid-intake screen and the filtering membrane layer, and thus improve the filtering efficiency of the materials.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A fast liquid inlet filtration membrane package comprises a liquid inlet screen, a filter membrane layer, a permeable screen and a rubber coating, wherein the liquid inlet screen and the permeable screen are stacked, the filter membrane layer is arranged between the liquid inlet screen and the permeable screen, the liquid inlet screen, the filter membrane layer and the permeable screen are all provided with corresponding liquid inlets, liquid outlets and reflux ports, the liquid inlet screen and the permeable screen both comprise a screen structure formed by weaving fibers along the warp and weft directions, and the angle between the straight wires of the liquid inlet screen and the main flow direction of the liquid inlet screen is 32-58°. The main flow direction of the inlet screen is the line between the nearest inlet and return port on the inlet screen. After entering the inlet screen, the material is divided into material flowing along the straight wire and material dispersed along the curved wire. Since the straight wire of the guide screen is set at an angle with the main flow direction, the material can fully flow along the straight wire and the curved wire in the diffusion direction and fully diffuse into the inlet screen, thereby improving the utilization rate of the inlet screen and increasing the inlet efficiency of the filter membrane package. When the material has a high viscosity or contains more impurities, the material distribution can be guided more quickly to avoid the uniformity of the material decreasing due to the long filtration time.

[0006] Preferably, the fibers of the screen structure include curved wires and straight wires, the curved angle of the straight wires is smaller than that of the curved wires, and the angle between the straight wires of the liquid inlet screen and the main flow direction of the liquid inlet screen is 40-45°. The angle between the straight wires of the liquid inlet screen and the main flow direction of the liquid inlet screen is smaller than the angle between the curved wires of the liquid inlet screen and the main flow direction of the liquid inlet screen. When the material enters the liquid inlet screen, it will mainly flow rapidly along the straight wires, and at the same time, the curved wires act tangentially on the material to improve the uniformity of the material. Another part of the material diffuses to the adjacent straight wires under the action of the curved wires, thereby improving the overall utilization rate of the liquid inlet screen, and the straight wires make the resistance encountered by the material when flowing along the curved wires relatively large, which is conducive to ensuring the flow rate of the material along the main flow direction.

[0007] Preferably, the angle between the fibers passing through the screen and the main flow direction through the screen is 32-58°. The main flow direction through the screen is the direction of the shortest distance between the liquid outlets on both sides of the screen. The angle between the fibers passing through the screen and the main flow direction through the screen is set so that the filtered permeate flows along the fibers to the liquid outlet or flows to the main flow direction through the screen under the guidance of the fibers, thereby improving the utilization rate of the screen and thus improving the filtration efficiency.

[0008] Preferably, the area of ​​the straight wire flow surface on both sides of the liquid inlet screen and / or the straight wire passing through the screen is 0.02-0.2mm 2 The area of ​​the liquid inlet screen and / or the curved wire flow surface on both sides of the curved wire passing through the screen is 0.1-0.8mm 2, the area of ​​the straight wire flow surface is less than or equal to the area of ​​the curved wire flow surface. Since the curved wire flow surface is larger than the straight wire flow surface, when the material enters the liquid inlet screen, it mainly flows along the straight wire direction, flows through the curved wire flow surface and flows to the reflux port, and part of the material flowing in the curved wire direction of the liquid inlet screen flows through the straight wire flow surface and diffuses into the liquid inlet screen, thereby improving the liquid inlet efficiency of the liquid inlet screen; when the filtered permeate enters the through-screen, it mainly flows along the straight wire, flows through the curved wire flow surface and converges to the liquid outlet position, and part of the permeate flowing in the curved wire direction of the through-screen flows through the straight wire flow surface and converges to the flow direction of the straight wire, so that the permeate on the through-screen can be discharged from the through-screen more quickly, thereby improving the filtration efficiency of the filter membrane package.

[0009] Preferably, the bending angle of the straight wire is 7-15°, and the bending angle of the curved wire is 14-31°. The bending angle of the straight wire is smaller than that of the curved wire, and the material flow rate is guaranteed in the process of guiding the material to flow along the straight wire, while the bending angle of the curved wire is larger, and the gaps on both sides thereof are larger, so that the material can quickly pass through the curved wire in the process of flowing along the straight wire, and in the process of material flow, the curved wire with a larger bending angle can exert a tangential force on the material, thereby improving the uniformity of the material.

[0010] Preferably, the outermost side of the filter membrane package is a liquid inlet screen, and the number of the liquid inlet screens is 50-70% of the sum of the number of the liquid inlet screens and the permeation screens. A reasonable number of liquid inlet screens can quickly guide the material to diffuse to the upstream side of the filter membrane layer, and at the same time can prevent the permeate from being enriched in the permeation screen, reduce the reverse pressure on the filter membrane layer, and ensure the filtration stability of the filter membrane package.

[0011] Preferably, the ratio of the number of the liquid inlet screens to the number of the filter membrane layers is 0.8-1.2. In this way, after the material is diffused and distributed through the liquid inlet screen, the filter membrane layer can play a sufficient filtering role and the filter membrane layer is within a reasonable load range, reducing the risk of damage to the filter membrane layer.

[0012] Preferably, the thickness of the liquid inlet screen and / or the permeate screen is 300-600 μm. The screen structure has a certain thickness, so as to provide necessary flow space for the flow of material or permeate.

[0013] Preferably, the diameter of the fiber of the liquid inlet screen and / or the permeation screen is 150-400 μm, and the spacing between the fibers in the same screen structure is 160-450 μm. The fiber diameter is relatively small relative to the spacing between the fibers, so that the material or permeate can quickly pass through the spacing and flow to the corresponding reflux port or liquid outlet under the guidance of the fibers.

[0014] Preferably, the screen structure adopts plain weave or twill weave.

[0015] The beneficial effects of the utility model are as follows: (1) the angle between the fibers of the liquid inlet screen and the main flow direction is set, so that the material can be quickly diffused and distributed after entering the liquid inlet screen, thereby improving the utilization rate of the liquid inlet screen and thus improving the filtration efficiency of the filter membrane package; (2) the screen structure is woven by straight wires and curved wires, so that the material can quickly pass through the curved wires when flowing along the straight wires, and the curved wires with a larger bending angle can exert a tangential force on the material, thereby improving the uniformity of the material; (3) the angle between the fibers of the permeate screen and the main flow direction is set, which guides the flow direction of the permeate, thereby improving the utilization rate of the permeate screen; (4) through the setting of the flow surface, the material and the permeate flow along the straight wire through the curved wire flow surface and then converge to the corresponding reflux port or liquid outlet, which is beneficial to improving the liquid inlet and outlet efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the liquid inlet screen of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the liquid outlet screen of the utility model;

[0019] Figure 4 This is another structural schematic diagram of the liquid inlet screen of the utility model;

[0020] Figure 5 This is another structural schematic diagram of the liquid outlet screen of the utility model;

[0021] Figure 6 This is a schematic diagram of the bending angle of the plain woven fiber of the utility model;

[0022] Figure 7 This is a schematic diagram of the bending angle of the twill weave fiber of the utility model;

[0023] Figure 8 It is a schematic diagram of the flow surface of the plain woven fiber of the utility model;

[0024] Fig. 9 It is a schematic diagram of the flow surface of the twill weave fiber of the utility model.

[0025] In the figure: rubber coating 1, liquid inlet 2, liquid outlet 3, liquid inlet seal 4, membrane package main structure 5, liquid inlet screen 51, permeable screen 52, reflux port 6, bent wire 7, straight wire 8, main flow direction of liquid inlet screen 9, main flow direction of permeable screen 10, fiber 11, flow surface 12. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figure 1 In the embodiment shown, a fast liquid inlet filter membrane package includes a liquid inlet screen 51, a filter membrane layer, a permeable screen 52 and a rubber coating 1. The liquid inlet screen 51 and the permeable screen 52 are stacked, and the filter membrane layer is arranged between the liquid inlet screen 51 and the permeable screen 52. The liquid inlet screen 51, the filter membrane layer and the permeable screen 52 form a membrane package main structure 5. The rubber coating 1 seals and fixes the periphery of the main structure to obtain a filter membrane package. Figure 2 , Figure 3 As shown, the liquid inlet screen 51, the filter membrane layer and the permeation screen 52 are all provided with corresponding liquid inlet 2, liquid outlet 3 and reflux port 6, wherein the filter membrane package is provided with a liquid outlet 3 and a reflux port 6 on one side, and a liquid inlet 2 and a liquid outlet 3 on the other opposite side, a liquid inlet seal 4 is provided on the periphery of the liquid outlet 3 of the liquid inlet screen 51, and permeation seals are provided on the periphery of the liquid inlet 2 of the permeation screen 52 and the periphery of the reflux port 6 of the permeation screen 52, which are used to seal the corresponding through holes and form a flow channel for the material and the filtered permeate. The material enters the filter membrane package through the liquid inlet 2, and diffuses to the upstream side of the filter membrane layer through the liquid inlet screen 51, and forms permeate after filtering by the filter membrane layer, and finally discharges the filter membrane package from the liquid outlet 3 through the permeation screen 52.

[0028] When the liquid inlet screen 51 , the filter membrane layer and the permeable screen 52 are stacked, the outermost side of the filter membrane package is the liquid inlet screen 51 , and the number of the liquid inlet screen 51 is 50-70% of the sum of the number of the liquid inlet screen 51 and the permeable screen 52 . When the number of liquid inlet screens 51 is less than 50% of the total number of screens, the liquid inlet screens 51 are insufficient to guide the diffusion of materials, and the materials are easily enriched in the liquid inlet screens 51. As the filtration proceeds, the pressure of the filter membrane package continues to rise, and the filter membrane layer is easily damaged due to the large pressure. When the number of liquid inlet screens 51 is greater than 70% of the total number of screens, the permeate obtained by filtering through the filter membrane layer on the downstream side of the filter membrane layer is enriched in the permeate screen 52, causing the filter membrane layer to be subjected to reverse pressure, thereby destroying the filtration stability of the filter membrane package. When the number of liquid inlet screens 51 is 50-70% of the total number of screens, the liquid inlet screen 51 can quickly guide the materials to diffuse to the upstream side of the filter membrane layer, and after filtering through the filter membrane layer, a permeate with relatively less materials is obtained. At this time, the relatively small number of permeate screens 52 can fully guide the permeate to discharge from the filter membrane package.

[0029] The ratio of the number of liquid inlet screens 51 to the number of filter membrane layers is 0.8-1.2. When the ratio of the number of liquid inlet screens 51 to the number of filter membrane layers is less than 0.8, the number of liquid inlet screens 51 is relatively insufficient, resulting in some filter membrane layers not playing an effective filtering role, thereby reducing the utilization rate of the filter membrane package; when the ratio of the number of liquid inlet screens 51 to the number of filter membrane layers is greater than 1.2, the liquid inlet screen 51 guides a large amount of material to be distributed on the upstream side of the filter membrane layer, resulting in a large load on each filter membrane layer. When the viscosity of the material is large or the impurity content is large, the filter membrane layer is at risk of damage; when the number of liquid inlet screens 51 is 0.8-1.2 of the number of filter membrane layers, the liquid inlet screen 51 guides the material to enter, and filters the material into permeate through the filter membrane layer basically corresponding to the number of liquid inlet screens 51, and then discharges the filter membrane package through the permeate screen 52. At this time, the filter membrane layer inside the filter membrane package can be fully utilized, and the load of the filter membrane layer is small, which is conducive to ensuring the service life of the filter membrane layer.

[0030] The liquid inlet screen 51 and the permeation screen 52 both include a screen structure woven from fibers along the warp direction and the weft direction. The fibers of the screen structure include bent wires 7 and straight wires 8. The bending angle of the straight wires 8 is smaller than that of the bent wires 7. Figure 2 As shown, the angle α between the straight wire 8 of the liquid inlet screen 51 and the main flow direction 9 of the liquid inlet screen is 32-58°, and the main flow direction 9 of the liquid inlet screen is the line between the closest liquid inlet port 2 and the reflux port 6 on the liquid inlet screen 51. When the angle α is less than 32°, the main flow direction 9 of the liquid inlet screen is basically consistent with the direction of the straight wire 8. In the direction of the straight wire 8, the material flows quickly to the reflux port 6. However, the efficiency of the material flowing to the adjacent straight wire 8 is low, resulting in a low utilization rate of the liquid inlet screen 51, which makes the material diffusion efficiency low and there is a risk of decreased uniformity; when the angle α is greater than 58°, the material flow direction is basically consistent with the direction of the curved wire 7, and the straight wire 8 has a large resistance to the flow of the material, the speed of the material in the flow direction is affected, and the diffusion flow performance of the filtration membrane package is affected; when the angle α is 32-58°, the material flows along the straight wire 8 and the curved wire 7 in the diffusion direction and is fully diffused into the liquid inlet screen 51, thereby improving the utilization rate of the liquid inlet screen 51, so that the liquid inlet efficiency of the filtration membrane package is increased, and when the material viscosity is large or contains more impurities, the material distribution can be guided more quickly to avoid the uniformity of the material being reduced due to the long filtration time.

[0031] It is further preferred that the angle α between the straight wire 8 of the liquid inlet screen 51 and the main flow direction 9 of the liquid inlet screen is 40-45°, and the angle β between the curved wire 7 and the main flow direction is 45-50°. The material flows under the guidance of the straight wire 8 and the curved wire 7. Since the angle α is relatively small, the material mainly flows along the straight wire 8, and the gap of the curved wire 7 is large, so that the material can flow quickly, and the curved wire 7 has a tangential effect on the material, thereby improving the uniformity of the material. The other part of the material, under the action of the curved wire 7, diffuses to the adjacent straight wire 8, thereby improving the overall utilization rate of the liquid inlet screen 51, but the straight wire 8 with a small gap makes the material encounter relatively large resistance when flowing along the curved wire 7, ensuring the flow rate of the material in the main flow direction.

[0032] like Figure 3 As shown, the angle between the fibers passing through the screen 52 and the main flow direction 10 passing through the screen is 32-58°. The main flow direction 10 passing through the screen is the direction of the shortest distance between the liquid outlets 3 on both sides of the screen 52. The angle between the straight wires 8 passing through the screen 52 and the main flow direction 10 passing through the screen is smaller than the angle between the curved wires 7 passing through the screen 52 and the main flow direction 10 passing through the screen. When the filtered permeate enters the screen 52, part of the permeate flows along the fibers to the liquid outlet 3, and part of the permeate flows to the main flow direction 10 passing through the screen under the guidance of the fibers, thereby improving the utilization rate of the screen 52. At the same time, the setting of the angle also causes the permeate to be subjected to the tangential force from the fibers during the flow process, thereby improving the uniformity of the distribution of the permeate.

[0033] like Figure 4 , Figure 5 As shown, corresponding to the filtration membrane package of the large flux filtration equipment or usage scenario, one side of the membrane package main structure 5 composed of the liquid inlet screen 51, the filtration membrane layer and the permeation screen 52 is provided with a plurality of reflux ports 6 and liquid outlets 3 arranged alternately, and the other opposite side is provided with a plurality of liquid outlets 3 and liquid inlet 2 arranged alternately. The angle setting between the straight wire 8 of the liquid inlet screen 51 and the main flow direction 9 of the liquid inlet screen, and the angle setting between the fiber of the permeation screen 52 and the main flow direction 10 of the permeation screen, are also applicable to such large filtration membrane packages.

[0034] The screen structure adopts plain weave or twill weave. Figure 6 As shown, the plain weave is that when the fiber 11 is woven along the warp direction, every other fiber 11 in the weft direction is woven once, and when the fiber 11 is woven along the weft direction, every other fiber 11 in the warp direction is woven once; as shown in FIG. Figure 7 As shown, the twill weave is that when the fibers 11 are woven along the warp direction, every at least two fibers 11 in the weft direction are woven once, and when the fibers 11 are woven along the weft direction, every equal number of fibers 11 in the warp direction are woven once.

[0035] In the process of weaving the fibers 11 of the liquid inlet screen 51 and the liquid outlet screen into a screen structure, both the straight wire 8 and the curved wire 7 will bend to a certain extent, forming a bending angle. The bending angle of the fiber 11 is the angle between the line connecting the lowest point and the highest point on the same side of the fiber 11 and the line connecting the lowest points. Figure 6 The plain weave screen shown in the figure has a bending angle of the fiber 11 of which is the angle γ between the line AC connecting the lowest point and the highest point on the same side of the fiber 11 and the line AB connecting the lowest points. Figure 7 The twill woven screen shown in the figure has a bending angle of the fiber 11 of which is the angle γ between the line AC between the lowest point and the highest point on the same side of the fiber 11 and the line AB between the lowest points. Specifically, for the straight wire 8 and the curved wire 7 in the screen structure, the bending angle of the straight wire 8 is 7-15°, and the bending angle of the curved wire 7 is 14-31°. The bending angle of the straight wire 8 is relatively small, and the flow rate of the material is ensured in the process of guiding the material to flow along the straight wire 8, while the bending angle of the curved wire 7 is relatively large, and the gaps on both sides thereof are relatively large. In the process of the material flowing along the straight wire 8, it can quickly pass through the curved wire 7, and in the process of the material flowing, the curved wire 7 with a relatively large bending angle can exert a tangential force on the material, thereby improving the uniformity of the material.

[0036] like Figure 8 , Fig. 9 As shown, the area formed by the line between the lowest points on one side of the fiber 11 and the edge of the fiber 11 on this side is the flow surface 12, including the straight wire flow surface and the curved wire flow surface. The area of ​​the straight wire flow surface on both sides of the liquid inlet screen 51 and the straight wire 8 passing through the screen 52 is 0.02-0.2mm2, and the area of ​​the curved wire flow surface on both sides of the liquid inlet screen 51 and the curved wire 7 passing through the screen 52 is 0.1-0.8mm2. The area of ​​the straight wire flow surface is less than or equal to the area of ​​the curved wire flow surface. Figure 2 As shown, in the direction of the straight wire 8 of the liquid inlet screen 51, the material enters the liquid inlet screen 51 through the liquid inlet port 2. Since the curved wire flow surface is larger than the straight wire flow surface, the material mainly flows along the straight wire 8, flows through the curved wire flow surface and then flows to the reflux port 6; in the direction of the curved wire 7 of the liquid inlet screen 51, the material flows along the curved wire 7, flows through the straight wire flow surface and then diffuses into the liquid inlet screen 51, thereby improving the liquid inlet efficiency of the entire liquid inlet screen 51; combined with Figure 3 As shown, in the direction of the straight wire 8 passing through the screen 52, the material is filtered through the filter membrane layer to form a permeate, and the permeate flows along the straight wire 8, passes through the curved wire flow surface, converges to the liquid outlet 3, and is discharged from the filter membrane package; in the direction of the curved wire 7 passing through the straight wire flow surface, converges to the flow direction of the straight wire 8 along the curved wire 7, so that the permeate passing through the screen 52 can be discharged more quickly through the screen 52, thereby improving the filtration efficiency of the filter membrane package.

[0037] The thickness of the liquid inlet screen 51 and the permeation screen 52 is 300-600 μm, the diameter of the fiber 11 of the liquid inlet screen 51 and the permeation screen 52 is 150-400 μm, and the interval between the fibers 11 in the same screen structure is 160-450 μm. The liquid inlet screen 51 and the permeation screen 52 have a certain thickness, which can provide the necessary flow space for the flow of materials or permeate, and the diameter of the fiber 11 is relatively small relative to the interval between the fibers 11. Under the guidance of the fiber 11, the material or permeate can quickly pass through the interval and flow to the corresponding liquid outlet 3 or reflux port 6.

[0038] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A fast liquid inlet filter membrane package, comprising a liquid inlet screen (51), a filter membrane layer, a permeable screen (52) and a rubber package (1), wherein the liquid inlet screen (51) and the permeable screen (52) are stacked, the filter membrane layer is arranged between the liquid inlet screen (51) and the permeable screen (52), and the liquid inlet screen (51), the filter membrane layer and the permeable screen (52) are all provided with a liquid inlet (2), a liquid outlet (3) and a reflux port (6) at corresponding positions, wherein: The liquid inlet screen (51) and the permeable screen (52) both comprise a screen structure formed by weaving fibers (11) along the warp direction and the weft direction, and the angle between the fibers (11) of the liquid inlet screen (51) and the main flow direction (9) of the liquid inlet screen is 32-58°.

2. A fast liquid-intake filtration membrane package according to claim 1, characterized in that: The fibers (11) of the screen structure include bent wires (7) and straight wires (8), the bending angle of the straight wires (8) is smaller than that of the bent wires (7), and the angle between the straight wires (8) of the liquid inlet screen (51) and the main flow direction (9) of the liquid inlet screen is 40-45°.

3. A fast liquid-intake filtration membrane package according to claim 1 or 2, characterized in that: The angle between the fibers (11) passing through the screen (52) and the main flow direction (10) passing through the screen is 32-58°.

4. A fast liquid-intake filtration membrane package according to claim 2, characterized in that: The area of ​​the straight wire flow surface on both sides of the liquid inlet screen (51) and / or the straight wire (8) passing through the screen (52) is 0.02-0.2mm 2 The area of ​​the curved wire flow surface on both sides of the liquid inlet screen (51) and / or the through screen (52) curved wire (7) is 0.1-0.8mm 2 , the area of ​​the straight wire flow surface is less than or equal to the area of ​​the bent wire flow surface.

5. A fast liquid-intake filtration membrane package according to claim 2, characterized in that: The bending angle of the straight wire (8) is 7-15°, and the bending angle of the curved wire (7) is 14-31°.

6. A fast liquid-intake filtration membrane package according to claim 1, 2 or 3, characterized in that: The outermost side of the filter membrane package is a liquid inlet screen (51), and the number of the liquid inlet screens (51) is 50-70% of the sum of the number of the liquid inlet screens (51) and the permeable screens (52).

7. A fast liquid-intake filtration membrane package according to claim 1, 2 or 3, characterized in that: The ratio of the number of the liquid inlet screens (51) to the number of the filter membrane layers is 0.8-1.

2.

8. A fast liquid-intake filtration membrane package according to claim 1, 2 or 3, characterized in that: The thickness of the liquid inlet screen (51) and / or the permeable screen (52) is 300-600 μm.

9. A fast liquid-intake filtration membrane package according to claim 1, 2 or 3, characterized in that: The diameter of the fibers (11) of the liquid inlet screen (51) and / or the fibers (11) passing through the screen (52) is 150-400 μm, and the interval between the fibers (11) located in the same screen structure is 160-450 μm.

10. A fast liquid-intake filtration membrane package according to claim 1, 2 or 3, characterized in that: The screen structure adopts plain weave or twill weave.

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