Filtering membrane bag

Abstract

The utility model relates to the technical field of filtering, in particular to a filtering membrane bag which comprises a filtering main body formed by stacking and arranging a plurality of liquid inlet units and filtering units at intervals, the liquid inlet unit and the filtering unit are provided with a liquid inlet, a reflux inlet and a liquid outlet which correspond to each other in position; the cover plate is arranged on at least one outer side of the filtering main body; a liquid inlet, a reflux inlet and a liquid outlet are formed in positions, corresponding to the filtering main body, of the cover plate; the rubber coating part is arranged on the peripheries of the filter main body and the cover plate in a rubber coating and sealing manner; the cover plate is fixedly and hermetically connected with the filtering main body; by means of direct fixed sealing connection or fixed sealing connection through sealing pieces, it is guaranteed that the positions of the corresponding liquid inlet, the corresponding backflow port and the corresponding liquid outlet correspond, and the situation that the flux is affected due to dislocation is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to a filtration membrane package. Background Art

[0002] According to the material flow direction, the filtration membrane separation technology can be divided into dead-end filtration and tangential flow filtration. Among them, dead-end filtration is that the material flow direction is the same as the material filtration direction. After a period of filtration, the filtered material is enriched on the surface of the filter membrane, gradually forming a filter cake layer or gel layer, resulting in a significant decrease in filtration efficiency and seriously affecting the service life of the filter membrane. In tangential flow filtration, the material flow direction is perpendicular to the filtration direction, and the material continuously flushes the filter membrane surface, flushing the filter membrane surface and increasing the service life of the filter membrane.

[0003] A filter membrane package is disclosed in the patent with publication number CN219764735U. After the liquid inlet unit and the filter unit are stacked, the cover plates arranged on both sides pre-clamp the filter membrane package, and under the encapsulation process, an encapsulation structure is formed to seal the filter membrane package. The sealing part is arranged by welding and is integrally formed with the corresponding liquid inlet unit and the filter unit. The outermost sealing part formed by the above-mentioned sealing form is directly in extrusion contact with the cover plate, which can easily make it difficult to completely align the liquid inlet of the cover plate and the liquid inlet of the liquid inlet unit, and make it difficult to completely align the reflux port of the cover plate and the reflux port of the liquid inlet unit; and then in the sealing process, the liquid inlet and reflux port on different components are misaligned, resulting in a decrease in the flux of the liquid inlet and the reflux port, and even leakage. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that a sealing part of a filter membrane package is set by welding, and the sealing form integrally formed with the corresponding liquid inlet unit and filter unit forms an outermost sealing part that is directly in squeeze contact with the cover plate, which easily makes it difficult to completely align the liquid inlet of the cover plate and the liquid inlet of the liquid inlet unit, and makes it difficult to completely align the reflux port of the cover plate and the reflux port of the liquid inlet unit; and then in the sealing process, the liquid inlet and reflux port on different components are misaligned, resulting in a decrease in the flux of the liquid inlet and the reflux port, and even causing leakage defects.

[0005] In order to overcome the above defects, the utility model provides an improved filtration membrane package, comprising:

[0006] The filter body is formed by stacking a plurality of liquid inlet units and filter units at intervals, wherein the liquid inlet units and the filter units are provided with liquid inlets, reflux ports and liquid outlets at corresponding positions;

[0007] A cover plate is arranged on at least one outer side of the filter body; a liquid inlet, a reflux port and a liquid outlet are arranged at positions corresponding to the filter body;

[0008] A rubber-coated part, wherein the rubber-coated seal is arranged on the periphery of the filter body and the cover plate;

[0009] The cover plate is fixedly and sealedly connected to the filter body.

[0010] The fixed sealing connection between the cover plate and the filter body includes a direct fixed sealing connection or a fixed sealing connection through a sealing member, both of which fall within the scope of fixed sealing connection, ensuring that the positions of the corresponding liquid inlet, reflux port and liquid outlet correspond to each other, preventing misalignment and affecting the flux.

[0011] Optionally, the outermost side of the filter body is a liquid inlet unit, and the periphery of the liquid outlet of the liquid inlet unit is fixedly and sealedly connected to the cover plate.

[0012] Optionally, the outermost side of the filter body is a filter unit, and the filter unit includes: a flow channel layer and filter membranes located on both sides of the flow channel layer; the periphery of the liquid outlet of the filter unit is fixedly sealed and connected to the cover plate, and / or the peripheries of the liquid inlet and reflux port of the filter unit are fixedly sealed and connected to the cover plate.

[0013] Optionally, the outermost side of the filter body is a filter unit, and the structure of the filter unit adjacent to the cover plate is a flow channel layer and a filter membrane located inside the flow channel layer, and the outer periphery of the liquid inlet and the reflux port of the flow channel layer are fixedly sealed and connected to the cover plate.

[0014] Optionally, a sealing member is provided between the cover plate and the filter body; the sealing member fixedly and sealingly connects the filter body and the cover plate.

[0015] Optionally, the sealing element comprises:

[0016] The first sealing member is arranged around at least one of the liquid inlet, the reflux port or the liquid outlet of the filter body.

[0017] Optionally, the first sealing member is annular, the inner diameter of the annular ring is the same as the inner diameter of the corresponding liquid inlet, reflux port or liquid outlet, and the ratio of the outer diameter of the annular ring to the inner diameter of the annular ring is in the range of 1.5-4.

[0018] Optionally, the sealing member further comprises:

[0019] The second sealing member is arranged around the edge of the filter body.

[0020] Optionally, the first sealing member and the second sealing member are separately or integrally provided.

[0021] Optionally, a gap is provided between the second sealing member and an edge of the filter body.

[0022] Optionally, the thickness of the seal is in the range of 0.1 mm to 0.8 mm;

[0023] And / or, the sealing member is made of any one of PE, PA, rubber, PMMA or PP;

[0024] And / or, the fixed sealing connection is hot melt welding, ultrasonic welding, eddy current welding or glue bonding.

[0025] Optionally, the liquid inlet unit is a film, non-woven fabric or screen structure;

[0026] The flow channel layer is a film, non-woven fabric or screen structure;

[0027] The mesh diameter of the sieve structure ranges from 0.2 mm to 0.5 mm, and the opening rate of the sieve structure ranges from 24% to 36%.

[0028] Optionally, the cover plate includes:

[0029] The sealing layer is provided with a liquid inlet, a reflux port and a liquid outlet.

[0030] Optionally, the cover plate further includes:

[0031] A supporting layer, wherein a liquid inlet, a reflux port and a liquid outlet are provided at positions corresponding to the sealing layer, and the supporting layer is fixedly and sealedly connected to the sealing layer;

[0032] And / or, the sealing layer is made of any one of PE, PA, rubber, PMMA or PP.

[0033] The above technical solution of the utility model has the following advantages compared with the prior art:

[0034] 1. The filter membrane package provided by the utility model includes: a filter body, which is formed by stacking and arranging a plurality of liquid inlet units and filter units at intervals; the liquid inlet unit and the filter unit are provided with a liquid inlet, a reflux port and a liquid outlet at corresponding positions; a cover plate, which is arranged on at least one outer side of the filter body; the position of the cover plate corresponding to the filter body is provided with a liquid inlet, a reflux port and a liquid outlet; a rubber-coated part, the rubber-coated seal is arranged on the periphery of the filter body and the cover plate; the cover plate is fixedly sealed and connected with the filter body; the present application adopts the above technical solution, and through a fixed sealing connection, ensures that the positions of the corresponding liquid inlet, reflux port and liquid outlet correspond to each other, and prevents misalignment from occurring, which affects the flux. At the same time, compared with the existing extrusion sealing form, when stacking a plurality of liquid inlet units and filter units, a greater pressing force is not required, thereby preventing the filter membrane package from being broken due to excessive pressing force.

[0035] 2. The seal described in the utility model includes: a first seal, which is arranged around at least one of the liquid inlet, reflux port or liquid outlet of the filter body; the present application adopts the above-mentioned technical solution, and the first seal can effectively isolate the liquid inlet channel and the filtrate channel, effectively prevent leakage and isolate the inlet and outlet fluids, and achieve better sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a schematic diagram of the structure of the filtration membrane package provided in the first embodiment of the utility model;

[0038] Figure 2 This is a schematic structural diagram of the sealing member provided in the first embodiment of the present utility model;

[0039] Figure 3 This is a schematic cross-sectional structural diagram of the cover plate provided in the first embodiment of the present utility model;

[0040] Figure 4 This is a schematic cross-sectional structural diagram of the filter body provided in the first embodiment of the utility model;

[0041] Figure 5 This is a schematic structural diagram of a liquid inlet unit with a sealing member provided in Embodiment 1 of the present utility model;

[0042] Figure 6 This is a schematic diagram of the top view of the cover plate provided in the first embodiment of the present utility model;

[0043] Figure 7 This is a schematic structural diagram of a liquid inlet unit with a seal provided in Embodiment 2 of the present utility model;

[0044] Figure 8 This is a schematic structural diagram of a liquid inlet unit with a sealing member provided in Embodiment 3 of the present utility model;

[0045] Fig. 9 This is a structural schematic diagram of a liquid inlet unit with a sealing member provided in Embodiment 4 of the present utility model;

[0046] Fig.10 This is a schematic structural diagram of the cover plate provided in Embodiment 5 of the present utility model.

[0047] Description of reference numerals:

[0048] 1. Liquid inlet unit; 2. Filter unit; 3. Liquid inlet; 4. Reflux port; 5. Liquid outlet; 6. Cover plate; 7. Rubber package; 8. Sealing element; 9. First sealing element; 10. Second sealing element; 11. Flow channel layer; 12. Filter membrane; 13. Sealing layer; 14. Support layer. DETAILED DESCRIPTION

[0049] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] When the number of liquid inlet units and filter units stacked in the filter membrane package increases gradually, if a compression seal is adopted, a greater compression force may be required, which not only puts a test on the compression fixture, but also may cause the compression force to be too large, resulting in deformation or even rupture of part of the material of the filter membrane package. For the above reasons, the present application proposes an improved filter membrane package.

[0054] Implementation Method 1

[0055] like Figures 1 to 6 A specific embodiment of the filter membrane package shown includes: a filter body, two cover plates 6 and a rubber package 7.

[0056] like Figure 1 and Figure 4 As shown, the filter body is formed by a plurality of liquid inlet units 1 and filter units 2 stacked and arranged at intervals, and the outermost side of the filter body is the liquid inlet unit 1; the liquid inlet unit 1 and the filter unit 2 are provided with a liquid inlet 3, a reflux port 4 and a liquid outlet 5 at corresponding positions. Two cover plates 6 are respectively arranged on the two outer sides of the filter body; the positions of the cover plate 6 corresponding to the liquid inlet unit 1 are provided with a liquid inlet 3, a reflux port 4 and a liquid outlet 5. The rubber-coated part 7 is rubber-coated and sealed and arranged on the periphery of the filter body and the cover plate 6. A sealing part 8 is arranged between the cover plate 6 and the adjacent liquid inlet unit 1; the sealing part 8 is fixedly and sealedly connected to the liquid inlet unit 1 and the cover plate 6. The fixed sealing connection form of the sealing part 8 is: hot melt welding, ultrasonic welding, eddy current welding or glue bonding.

[0057] like Figure 2 and Figure 5As shown, the seal 8 includes: a first seal 9 and a second seal 10. The first seal 9 is arranged around the liquid outlet 5. When the first seal 9 is welded, its smaller area can ensure better melting effect at the first seal and stronger welding strength; when glue bonding is adopted, it is conducive to the discharge of bubbles and better bonding strength. Specifically, the first seal 9 is annular, the inner diameter of the ring is the same as the inner diameter of the corresponding liquid outlet 5, and the ratio of the outer diameter of the ring to the inner diameter of the ring is in the range of 1.5 to 4. The ratio of the outer diameter of the ring to the inner diameter of the ring must be greater than 1.5, because only after having a sufficient connection area can sufficient connection strength be guaranteed to achieve a better sealing effect; the ratio of the outer diameter of the ring to the inner diameter of the ring must be less than 4, because when the area of ​​the first seal 9 is too large, the melting effect will be worse when welding is adopted, and when glue bonding is adopted, it is not conducive to the discharge of bubbles in the glue. The second seal 10 is arranged around the edge of the liquid inlet unit 1. The first seal 9 and the second seal 10 are arranged in one piece. When the number of first seals 9 is large, the preparation process can be simplified by setting the first seal 9 and the second seal 10 as one. The thickness range of the seal 8 is 0.1 mm to 0.8 mm. When the thickness of the seal 8 is less than 0.1 mm, the cover plate 6 and the liquid inlet unit 1 are almost fitted, so that the liquid inlet flow channel between the cover plate 6 and the liquid inlet unit 1 becomes narrower or even disappears, the filtration resistance of the filter membrane package increases, and the filtration efficiency decreases; when the thickness of the seal 8 is greater than 0.8 mm, the seal 8 can support the cover plate 6. Although a wider flow channel exists at the liquid inlet, the middle area of ​​the cover plate 6 is easy to collapse and fit to the liquid inlet unit 1, which will cause the effective area of ​​the liquid inlet to decrease; therefore, when the thickness of the seal 8 is in the range of 0.1 mm to 0.8 mm, the liquid inlet has a sufficient and relatively uniform flow channel, which allows the liquid to be completely distributed on the entire liquid inlet unit 1 to achieve the best filtration effect. Specifically, the sealing member 8 is made of any one of PE (polyethylene resin), PA (polyamide resin), rubber, PMMA (polymethyl methacrylate) or PP (polypropylene).

[0058] like Figure 2 and Figure 5 As shown, a gap is provided between the second sealing member 10 and the edge of the liquid inlet unit 1. The gap ranges from 1 mm to 10 mm. By providing the gap, during the process of the rubber encapsulation and sealing of the rubber encapsulation member 7, the rubber encapsulation member 7 can quickly penetrate into the edge of the liquid inlet unit 1, thereby improving the sealing performance of the filter membrane package.

[0059] like Figure 4As shown, the liquid inlet unit 1 is a film, non-woven fabric or screen structure. The filter unit 2 includes: a flow channel layer 11 and a filter membrane 12 located on both sides of the flow channel layer 11; the flow channel layer 11 is a film, non-woven fabric or screen structure. By setting the liquid inlet unit 1 and the flow channel layer 11 as a screen structure, the fluidity of the material can be improved when the material flows along the screen structure, and the material can be prevented from being stratified during the flow; at the same time, due to the larger opening design in the screen structure, it does not affect the flow of the material, nor does it directly participate in the filtration of the material, avoiding the influence of the filtration efficiency and filtration stability due to the design of the screen structure. The mesh diameter of the screen structure ranges from 0.2 mm to 0.5 mm, and the opening rate of the screen structure ranges from 24% to 36%. Specifically, the filter membrane 12 is a cellulose filter membrane, a polyethersulfone filter membrane, a polytetrafluoroethylene filter membrane or a polyvinylidene fluoride filter membrane.

[0060] like Figure 3 and Figure 6 As shown, the cover plate 6 includes: a sealing layer 13 and a supporting layer 14. By providing the sealing layer 13, the liquid inlet unit 1 can be prevented from directly contacting the outside and being damaged by the outside; by providing the supporting layer 14, the strength of the cover plate 6 is further improved. The sealing layer 13 is provided with a liquid inlet 3, a reflux port 4 and a liquid outlet 5. The supporting layer 14 is provided with a liquid inlet 3, a reflux port 4 and a liquid outlet 5 at a position corresponding to the sealing layer 13, and the supporting layer 14 is fixedly sealed and connected to the sealing layer 13. Figure 3 As shown, a sealing layer 13 is provided on both the inner and outer sides of the support layer 14. Of course, the sealing layer 13 can also be provided only on the inner side or the outer side of the support layer 14. Specifically, the support layer 14 is preferably a mesh structure. The support layer 14 and the sealing layer 13 are fixedly sealed and connected in a form of hot melt welding, ultrasonic welding, eddy current welding or glue bonding. Specifically, the material of the sealing layer 13 is any one of PE, PA, rubber, PMMA or PP.

[0061] The working process of the filtration membrane package described in the present application is briefly described as follows: the material enters the filtration membrane package through the liquid inlet 3, is distributed under the action of the liquid inlet unit 1, and is filtered through the filter membrane 12 to obtain the permeate, which is discharged from the filtration membrane package from the liquid outlet 5; and the residual liquid remaining after the material is filtered is discharged from the filtration membrane package through the reflux port 4, thereby completing the filtration of the material.

[0062] Implementation Method 2

[0063] like Figure 7 As shown, the first sealing member 9 and the second sealing member 10 are arranged separately. Other technical solutions are the same as those of the first embodiment.

[0064] Implementation Method 3

[0065] like Figure 8As shown, the sealing member 8 only includes: a first sealing member 9. Other technical solutions are the same as those in the first embodiment.

[0066] Implementation Method 4

[0067] like Fig. 9 As shown, the number of the liquid inlet 3, the reflux port 4 and the liquid outlet 5 of the liquid inlet unit 1 is less than that of the first embodiment, and the size is smaller than that of the first embodiment. Other technical solutions are the same as those of the first embodiment.

[0068] Implementation Method 5

[0069] like Fig.10 As shown, the cover plate 6 only includes: a sealing layer 13, and the sealing layer 13 can be a single layer. Other technical solutions are the same as those in the first embodiment.

[0070] Implementation Method 6

[0071] No sealing member 8 is provided between the cover plate 6 and the adjacent liquid inlet unit 1, and the outer periphery of the liquid outlet 5 of the liquid inlet unit 1 is directly fixedly sealed and connected to the cover plate 6, and the fixedly sealed connection is in the form of hot melt welding, ultrasonic welding, eddy current welding or glue bonding, and other technical schemes are the same as those in the first embodiment.

[0072] Implementation Method 7

[0073] The filter body is formed by stacking a plurality of liquid inlet units 1 and filter units 2 at intervals, and the outermost part of the filter body is the filter unit 2; the liquid inlet unit 1 and the filter unit 2 are provided with a liquid inlet 3, a reflux port 4 and a liquid outlet 5 at corresponding positions. The liquid inlet unit 1 is a film, a non-woven fabric or a mesh structure. The filter unit 2 includes: a flow channel layer 11 and filter membranes 12 located on both sides of the flow channel layer 11; the flow channel layer 11 is a film, a non-woven fabric or a mesh structure.

[0074] The sealing member 8 includes: a first sealing member 9 and a second sealing member 10, wherein the first sealing member 9 is arranged around the liquid inlet 3 and the reflux port 4. The outer periphery of the liquid inlet 3 and the reflux port 4 of the filter unit 2 is fixedly sealed and connected to the cover plate 6 through the first sealing member 9, that is, the filter membrane 12 outside the filter unit 2 is fixedly sealed and connected to the cover plate 6 through the first sealing member 9. The fixed sealing connection form is: hot melt welding, ultrasonic welding, eddy current welding or glue bonding, and other technical solutions are the same as those of the first embodiment.

[0075] Implementation Method 8

[0076] The filter body is formed by stacking a plurality of liquid inlet units 1 and filter units 2 at intervals, and the outermost part of the filter body is the filter unit 2; the liquid inlet unit 1 and the filter unit 2 are provided with a liquid inlet 3, a reflux port 4 and a liquid outlet 5 at corresponding positions. The liquid inlet unit 1 is a film, a non-woven fabric or a mesh structure. The filter unit 2 includes: a flow channel layer 11 and filter membranes 12 located on both sides of the flow channel layer 11, but the outermost filter unit 2 adjacent to the cover plate 6 only includes the flow channel layer 11 and the filter membrane 12 inside it; the flow channel layer 11 is a film, a non-woven fabric or a mesh structure.

[0077] The sealing member 8 includes: a first sealing member 9 and a second sealing member 10, wherein the first sealing member 9 is arranged around the liquid inlet 3 and the return port 4. The outer periphery of the liquid inlet 3 and the return port 4 corresponding to the flow channel layer 11 on the filter unit 2 is fixedly sealed and connected to the cover plate 6 through the first sealing member 9. The fixed sealing connection form is: hot melt welding, ultrasonic welding, eddy current welding or glue bonding, and other technical solutions are the same as those in the first embodiment.

[0078] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A filtration membrane package, characterized in that: include: The filter body is formed by stacking and arranging a plurality of liquid inlet units (1) and filter units (2) at intervals; the liquid inlet units (1) and the filter units (2) are provided with liquid inlets (3), reflux ports (4) and liquid outlets (5) at corresponding positions; A cover plate (6) is arranged on at least one outer side of the filter body; a liquid inlet (3), a reflux port (4) and a liquid outlet (5) are provided at positions of the cover plate (6) corresponding to the filter body; A rubber-coated part (7), the rubber-coated seal being arranged on the outer periphery of the filter body and the cover plate (6); The cover plate (6) is fixedly and sealingly connected to the filter body.

2. The filtration membrane package according to claim 1, characterized in that The outermost side of the filter body is a liquid inlet unit (1), and the outer periphery of the liquid outlet (5) of the liquid inlet unit (1) is fixedly and sealingly connected to the cover plate (6).

3. The filtration membrane package according to claim 1, characterized in that The outermost side of the filter body is a filter unit (2), the outer periphery of the liquid outlet (5) of the filter unit (2) is fixedly sealed and connected to the cover plate (6), and / or the outer peripheries of the liquid inlet (3) and the reflux port (4) of the filter unit (2) are fixedly sealed and connected to the cover plate (6).

4. The filtration membrane package according to claim 1, characterized in that The outermost side of the filter body is a filter unit (2), and the filter unit (2) adjacent only to the cover plate (6) comprises: a flow channel layer (11) and a filter membrane (12) located inside the flow channel layer (11); the outer periphery of the liquid inlet (3) and the return port (4) of the flow channel layer (11) are fixedly sealed and connected to the cover plate (6).

5. The filtration membrane package according to any one of claims 1 to 4, characterized in that: A sealing member (8) is provided between the cover plate (6) and the filter body, and the sealing member (8) fixedly and sealingly connects the filter body and the cover plate (6).

6. The filtration membrane package according to claim 5, characterized in that: The sealing member (8) comprises: A first sealing member (9) is arranged around at least one of the liquid inlet (3), the reflux port (4) or the liquid outlet (5) of the filter body.

7. The filtration membrane package according to claim 6, characterized in that: The first sealing member (9) is annular, the inner diameter of the annular ring is the same as the inner diameter of the corresponding liquid inlet (3), reflux port (4) or liquid outlet (5), and the ratio of the outer diameter of the annular ring to the inner diameter of the annular ring is in the range of 1.5 to 4.

8. The filtration membrane package according to claim 7, characterized in that: The sealing member (8) further comprises: The second sealing member (10) is arranged around the edge of the filter body, and the first sealing member (9) and the second sealing member (10) are arranged separately or in one piece.

9. The filtration membrane package according to claim 8, characterized in that: The second sealing member (10) is spaced apart from the edge of the filter body.

10. The filtration membrane package according to claim 5, characterized in that: The thickness of the sealing member (8) ranges from 0.1 mm to 0.8 mm; And / or, the material of the sealing member (8) is any one of PE, PA, rubber, PMMA or PP; And / or, the fixed sealing connection is hot melt welding, ultrasonic welding, eddy current welding or glue bonding.

11. The filtration membrane package according to any one of claims 1 to 3, characterized in that: The liquid inlet unit (1) is a film, non-woven fabric or screen structure; The filter unit (2) comprises: a flow channel layer (11) and filter membranes (12) located on both sides of the flow channel layer (11); the flow channel layer (11) is a film, non-woven fabric or screen structure; The mesh diameter of the sieve structure ranges from 0.2 mm to 0.5 mm, and the opening rate of the sieve structure ranges from 24% to 36%.

12. The filtration membrane package according to claim 1, characterized in that: The cover plate (6) comprises: A sealing layer (13) is provided with a liquid inlet (3), a reflux port (4) and a liquid outlet (5).

13. The filtration membrane package according to claim 12, characterized in that: The cover plate (6) further comprises: A support layer (14), wherein positions of the support layer (14) corresponding to the sealing layer (13) are provided with a liquid inlet (3), a reflux port (4) and a liquid outlet (5), and the support layer (14) is fixedly and sealedly connected to the sealing layer (13); And / or, the sealing layer (13) is made of any one of PE, PA, rubber, PMMA or PP.

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