CN220495737U - Filtering membrane package unit and filtering membrane package - Google Patents

Abstract

The utility model relates to a filtering membrane packaging unit which comprises a liquid inlet unit and a permeation unit, wherein the liquid inlet unit comprises a liquid inlet screen, the permeation unit comprises a permeation screen and filtering membrane layers arranged on two sides of the permeation screen, the liquid inlet screen, the filtering membrane layers and the permeation screen are respectively provided with a liquid inlet, a liquid outlet and a backflow port, sealing rings are respectively arranged at the liquid outlet of the liquid inlet screen, the liquid inlet of the permeation screen and the backflow port of the permeation screen in a relative mode, the center of each sealing ring is provided with a through hole, and at least part of each through hole is communicated with the liquid inlet, the liquid outlet or the backflow port to be sealed so as to allow liquid to flow in and flow out. The beneficial effects of the utility model are as follows: the use of an adhesive is avoided, and the damage or the liquid exudation of the filtering membrane wrapping unit in the use process is prevented. Meanwhile, the size of a sealing area after packaging can be effectively controlled relative to the adhesive sealing ring, and the filter membrane packaging unit has better applicability to filter membrane packaging units with various sizes.

Description

Filtering membrane package unit and filtering membrane package

Technical Field

The utility model relates to the field of filtration, in particular to a filtering membrane package unit and a filtering membrane package.

Background

The membrane separation technology utilizes the pressure difference at two sides of the filtering membrane to realize selective permeation of materials under the action of the pore structure of the filtering membrane. According to different filtering modes, the membrane separation technology can be divided into tangential flow filtration and dead-end filtration, and the tangential flow filtration is used as a novel filtering mode, and the tangential flow filtration is difficult to form a gel layer or a filter cake layer on the surface of a filtering membrane due to the tangency of the filtering direction and the material flowing direction, so that the filtering efficiency and the service life of the filter are improved.

The filtration membrane package is used as a most common tangential flow filtration device and is fully utilized in the field of biological medicine. The inside of the filter membrane is formed by stacking one or more groups of filter membrane package units, each filter membrane package unit comprises a liquid inlet unit and a filter unit, materials enter the filter unit uniformly through the distribution of the liquid inlet units after entering the filter membrane package, the materials are filtered under the action of the filter membrane layer, and finally the materials are discharged out of the filter membrane package to enter the subsequent process. In use, the filter membrane package is typically held in a stack of a plurality of membrane packages in two metal clamps that provide precise mechanical control of the internal pressure of the filter membrane package and distribution of the filtration flow through the plurality of channels within the filter membrane package. The metal fixture is provided with a liquid inlet pipeline port and a filtrate pipeline port, the filter membrane bag is correspondingly provided with a liquid inlet port and a filtrate port, the liquid inlet pipeline port corresponds to the liquid inlet port, and the filtrate pipeline port corresponds to the filtrate port. The liquid inlet butt joint and the filtrate hole butt joint among the plurality of membrane bags need to be sealed, so that the filtrate and the stock solution are prevented from converging.

CN115608158A discloses a filtering membrane package and a preparation method thereof, wherein the liquid outlet flow guiding unit and the liquid inlet unit are subjected to targeted adhesive sealing through an adhesive, so that the liquid inlet channel and the backflow channel are mutually independent and sealed with the liquid outlet channel, and the filtering performance of the filtering membrane package is ensured. However, the chemical property of the material of the adhesive is relatively unstable, so that the material is washed away for a long time in the use process of the filtering membrane packaging unit, and the tightness of the filtering membrane packaging unit is easily influenced, thereby influencing the service life of the product.

Disclosure of Invention

In view of the above-mentioned drawbacks and shortcomings of the prior art, the present utility model provides a filtering membrane package unit and a filtering membrane package, so as to solve the problems of reduced sealability and reduced service life caused by relatively unstable chemical properties of an adhesive.

The utility model provides a filtering membrane package unit on the one hand, which comprises a liquid inlet unit and a permeation unit, wherein the liquid inlet unit comprises a liquid inlet screen, the permeation unit comprises a permeation screen and filtering membrane layers arranged on two sides of the permeation screen, and the liquid inlet screen, the filtering membrane layers and the permeation screen are respectively provided with a liquid inlet, a liquid outlet and a backflow port, and the filtering membrane package unit is characterized in that: sealing rings are respectively and oppositely arranged at the liquid outlet of the liquid inlet screen, the liquid inlet penetrating through the screen and the reflux outlet penetrating through the screen, and the sealing rings seal the circumferences of the liquid outlet, the liquid inlet or the reflux outlet corresponding to the sealing rings through welding; and the center of the sealing ring is provided with a through hole which is at least partially communicated with a liquid inlet, a liquid outlet or a reflux port to be sealed, so that liquid can flow in and out.

Preferably, the liquid circulation port is a circular through hole, and the sealing ring is in a circular ring shape.

Preferably, the minimum distance between the outer edge of the sealing ring and the circumference of the liquid circulation port of the corresponding sealing is not less than 1mm.

Preferably, the minimum distance between the outer edge of the sealing ring and the circumference of the liquid circulation port which is correspondingly sealed is 2-5 mm.

Preferably, the inner diameter D1 of the sealing ring arranged at the liquid outlet of the liquid inlet screen is smaller than or equal to the diameter D3 of the liquid outlet of the liquid inlet screen.

Preferably, the inner diameter D2 of the sealing ring arranged at the liquid inlet of the permeation screen is smaller than or equal to the liquid inlet diameter D4 of the filtering membrane layer, and D2 is smaller than or equal to the liquid inlet diameter D5 of the permeation screen.

Preferably, the sealing ring is made of thermoplastic material selected from any one of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate and polyamide.

The utility model also provides a filter membrane package which is formed by stacking the filter membrane package units after welding the sealing rings and packaging the stacked filter membrane package units.

Preferably, the height of the sealing ring protruding out of the surface of the liquid inlet screen or the penetrating screen is 150-700 μm.

Preferably, the height of the sealing ring protruding out of the surface of the liquid inlet screen or the penetrating screen is 250-500 μm.

The beneficial effects of the utility model are as follows: according to the filtering membrane packaging unit, the liquid outlet of the liquid inlet screen, the liquid inlet of the screen and the reflux outlet of the screen which need to be sealed are oppositely provided with the paired sealing rings, and the sealing rings seal the circumferences of the corresponding liquid outlet, the liquid inlet and the reflux outlet through welding, so that the use of an adhesive is avoided, and the damage or the liquid exudation of the filtering membrane packaging unit in the use process is prevented. Meanwhile, the size of a sealing area after packaging can be effectively controlled relative to the adhesive sealing ring, and the filter membrane packaging unit has better applicability to filter membrane packaging units with various sizes.

Drawings

FIG. 1 is a schematic diagram showing an exploded structure of a filtering membrane pack unit according to the present utility model;

FIG. 2 is a schematic diagram of an exploded structure of the liquid inlet unit shown in FIG. 1;

FIG. 3 is an exploded view of the permeation unit of FIG. 1;

FIG. 4 is a schematic diagram of a membrane layer structure of an embodiment at a liquid outlet of a filtering membrane pack unit;

FIG. 5 is a schematic view of a membrane layer structure of another embodiment of the liquid outlet of the filtering membrane unit;

FIG. 6 is a schematic diagram of a membrane layer structure of an embodiment of a liquid inlet of a filtering membrane pack unit;

FIG. 7 is a schematic diagram of a membrane layer structure of another embodiment of the liquid inlet of the filtering membrane unit;

FIG. 8 is a schematic diagram of a filter membrane pack according to the present utility model.

Reference numerals: the liquid inlet screen 1, the filtering membrane layer 2, the permeation screen 3, the liquid inlet 4, the liquid outlet 5, the backflow port 6, the sealing ring 7, the first liquid inlet 4-1, the second liquid inlet 4-2, the third liquid inlet 4-3, the first liquid outlet 5-1, the second liquid outlet 5-2 and the third liquid outlet 5-3, the first backflow port 6-1, the second backflow port 6-2, the third backflow port 6-3, the first sealing ring 7-1, the second sealing ring 7-2 and the third sealing ring 7-3.

Detailed Description

In order to better understand the above technical solution, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein.

In one embodiment, referring to fig. 1 to 3, the present utility model provides a filtering membrane package unit, which includes a liquid inlet unit and a permeation unit disposed at a downstream of the liquid inlet unit, wherein the liquid inlet unit includes a liquid inlet screen 1, the permeation unit includes a permeation screen 3 and filtering membrane layers 2 disposed at two sides of the permeation screen, the liquid inlet screen 1, the filtering membrane layers 2 and the permeation screen 3 are respectively provided with a liquid inlet 4, a liquid outlet 5 and a backflow port 6, the liquid inlet 4 further includes a first liquid inlet 4-1, a second liquid inlet 4-2 and a third liquid inlet 4-3, the liquid outlet 5 includes a first liquid outlet 5-1, a second liquid outlet 5-2 and a third liquid outlet 5-3, and the backflow port 6 includes a first backflow port 6-1, a second backflow port 6-2 and a third backflow port 6-3.

The first liquid inlet 4-1 and the first return opening 6-1 are oppositely arranged at two sides of the liquid inlet screen 1, the first liquid outlet 5-1 is respectively arranged at the first liquid inlet 4-1 side and the first return opening 6-1 side, and the first liquid outlet 5-1 is respectively arranged with the first liquid inlet 4-1 and the first return opening 6-1 at intervals. The filtering membrane layer 2 is provided with a second liquid inlet 4-2, a second liquid outlet 5-2 and a second return orifice 6-2, and a third liquid inlet 4-3, a third liquid outlet 5-3 and a third return orifice 6-3 are arranged through the screen 3; the first liquid inlet 4-1, the second liquid inlet 4-2 and the third liquid inlet 4-3 are coaxially aligned in sequence, the first liquid outlet 5-1, the second liquid outlet 5-2 and the third liquid outlet 5-3 are coaxially aligned in sequence, and the first reflow mouth 6-1, the second reflow mouth 6-2 and the third reflow mouth 6-3 are coaxially aligned in sequence. The design structure is compact, the space can be better utilized, and the product volume is reduced.

The first liquid outlet 5-1, the third liquid inlet 4-3 and the third backflow port 6-3 are respectively provided with a first sealing ring 7-1, a second sealing ring 7-2 and a third sealing ring 7-3 in pairs on the opposite sides, and the corresponding liquid circulation ports of the sealing rings are sealed by welding.

The filtration membrane package unit in this embodiment can be formed by feed liquor screen cloth 1, filtration membrane layer 2, permeation screen cloth 3, filtration membrane layer 2, feed liquor screen cloth 1 stack in proper order, also can cancel one of them in upper strata or lower floor's feed liquor screen cloth 1 as required to the later stage carries out stack encapsulation to become filtration membrane package. Liquid is respectively fed from the first liquid inlets 4-1 of the liquid feeding screens 1 at two ends, filtered by the filtering membrane layer 2, the filtered liquid is guided to the third liquid outlet 5-3 by the penetrating screen 3, flows out through the first liquid outlet 5-1, and unfiltered liquid is discharged from the first backflow port 6-1.

The filtering membrane packaging unit is packaged through a welding process, so that the use of an adhesive is avoided, and the damage or liquid exudation of the filtering membrane packaging unit in the use process is prevented. Meanwhile, the size of a sealing area after packaging can be effectively controlled relative to the adhesive sealing ring, and the filter membrane packaging unit has better applicability to filter membrane packaging units with various sizes.

The welding process of the filter membrane pack unit includes one or more of thermal welding, ultrasonic welding, and eddy current welding. Under the action of a welding process, the liquid inlet units are connected and sealed with each other between the first sealing rings 7-1 arranged on two sides of the liquid inlet screen 1 to form a sealing structure, so that the sealing of the first liquid outlet 5-1 is realized, and liquid is prevented from directly flowing out from the liquid outlet without being filtered. Under the action of a welding process, the permeation unit is provided with a second sealing ring 7-2 and a third sealing ring 7-3 which are arranged between the filtering membrane layer 2 and the permeation screen 3, and on one hand, the filtering membrane layer 2 and the permeation screen 3 are connected together at the sealing rings through heating welding; on the other hand, the second sealing ring 7-2 can effectively seal the third liquid inlet 4-3, so that unfiltered liquid is prevented from entering the permeable screen 3 along the liquid inlet, and the third sealing ring 7-3 effectively seals the third backflow port 6-3, so that backflow liquid is prevented from entering the permeable screen 3 along the backflow port.

Further, the liquid inlet 4, the liquid outlet 5 or the backflow port 6 are all circular, and the sealing ring 7 is circular. Of course, any shape such as square, triangle, etc. may be substituted. The sealing ring is made of thermoplastic material, and can be selected from one or more of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate and polyamide. The sealing ring made of thermoplastic materials is used as a sealing piece, so that the use of an adhesive is avoided, and the damage or exudation of the filtering membrane packaging unit in the use process is prevented. Meanwhile, compared with the adhesive, the sealing ring can effectively control the size of a sealing area after encapsulation, and has better applicability to filter membrane package units with various sizes.

Further, the material of the liquid inlet screen 1 and the material of the permeation screen 3 are polypropylene, and can be replaced by one or more of polyethylene, polyvinyl chloride, polystyrene, polycarbonate and polyoxymethylene. The filtering membrane layer 2 may include a filtering membrane and a supporting layer, or may be provided with only the filtering membrane without the supporting layer, wherein the filtering membrane may be one or more selected from a cellulose filtering membrane, a polyvinylidene fluoride filtering membrane, and a polyethersulfone filtering membrane, and the supporting layer may be one or more selected from cellulose, polypropylene, and polyethylene.

In some embodiments, the minimum distance D between the outer edge of the sealing ring 7 and the circumference of the first liquid outlet 5-1, the third liquid inlet 4-3 or the third backflow port 6-3 is not less than 1mm, and preferably is 2-5 mm. When D is less than or equal to 1mm and less than 2mm, the sealing effect is poor due to the small contact surface between the sealing ring 7 and the adjacent liquid inlet screen 1, the permeation screen 3 or the filtering membrane layer 2, and the possibility of damage of the sealing performance of the filtering membrane wrapping unit exists for the excessive filtering pressure; when D is more than 5mm, a sufficient contact surface is formed between the sealing ring 7 and the adjacent liquid inlet screen 1, the permeation screen 3 or the filtering membrane layer 2, but the excessive contact surface causes the effective filtering area of the filtering membrane package to be reduced, and meanwhile, when a plurality of groups of liquid inlets 4, liquid outlets 5 or reflux ports 6 are formed on one side of the filtering membrane package, the adjacent sealing rings positioned on the same side of the liquid inlet screen 1 or the permeation screen 3 can be mutually connected to cause unnecessary holes to be sealed; when D is more than or equal to 2mm and less than or equal to 5mm, the sealing ring 7 has a sufficient contact surface with the permeation screen 3 and the filtering membrane layer 2, and meanwhile, the sealing rings are not connected with each other due to the fact that the sealing rings are large. When D is less than 1mm, the sealing ring 7 has small sealing connection effect on the liquid inlet screen 1 and the permeation screen 3, so that the sealing ring is easily damaged in use and cannot be used normally.

Specifically, the distance between the outer edge of the first sealing ring 7-1 and the liquid outlet of the liquid inlet screen 1, the distance between the outer edge of the second sealing ring 7-2 and the third liquid inlet 4-3, and the distance between the outer edge of the third sealing ring 7-3 and the third backflow port 6-3 are all 3mm. At this time, the sealing ring is fully contacted with the liquid inlet screen 1, the permeation screen 3 and the filtering membrane layer 2, and the sealing of the liquid inlet, the liquid outlet and the reflux port is further realized through a welding process. If the liquid inlet at the liquid inlet screen 1 is sealed by welding the first sealing ring 7-1, the liquid which is not filtered is prevented from directly flowing out of the liquid outlet.

In some embodiments, as shown in fig. 4, the inner diameter D1 of the first sealing ring 7-1 is smaller than the diameter D3 of the first liquid outlet 5-1, and part of the first sealing rings 7-1 are in direct contact during the packaging process to form a tight combination, so that insufficient sealing caused by obstruction of the liquid inlet screen 1 during the sealing process of the first sealing rings 7-1 is avoided, and the sealing performance of the first liquid outlet 5-1 is improved by liquid inlet.

In some embodiments, as shown in fig. 5, the inner diameter D1 of the first sealing ring 7-1 may also be the same as the diameter D3 of the first liquid outlet 5-1, i.e. the first sealing ring 7-1 completely overlaps the liquid inlet screen 1 during packaging, and after welding, the bonding between the first sealing ring 7-1 and the liquid inlet screen 1 is improved, thereby improving the sealing performance of the first liquid outlet 5-1.

In some embodiments, as shown in fig. 6, the inner diameter D2 of the second sealing ring 7-2 is the same as the diameter D4 of the second liquid inlet 4-2 and the diameter D5 of the third liquid inlet 4-3, that is, d2=d5=d4, and at this time, the second sealing ring 7-2 is completely overlapped with the permeable screen 3 and the filtering membrane layer 2, so that the second sealing ring 7-2 is tightly combined with the permeable screen 3 and the filtering membrane layer 2, and the tightness of the permeable unit is improved.

In other embodiments, as shown in fig. 7, d2=d4 < D5, i.e. the second seal ring 7-2 has an inner diameter smaller than the second inlet diameter 4-2, but the same diameter as the third inlet 4-3. At this time, the two sealing rings 7-2 of Zhou Beidi in the filtering membrane layer 2 are effectively connected in a sealing way, so that the sealing connection between the filtering membrane layer 2 and the permeation screen 3 is improved.

Alternatively, D2< D4, D2< D5, i.e. the inner diameter of the second sealing ring 7-2 is smaller than the diameters of the second liquid inlet 4-2 and the third liquid inlet 4-3, and the second sealing ring 7-2 is in direct contact and seals along the inner periphery of the second liquid inlet 4-2. The sealing effect is better for the direct welding sealing between the screen 3 and the second sealing ring 7-2, and the sealing performance at the position of the third liquid inlet 4-3 is improved; for the filtering membrane layer 2, the second sealing ring 7-2 seals the inner periphery of the second liquid inlet 4-2 on the basis of sealing connection with the filtering membrane layer 2, so that the sealing performance between the filtering membrane layer 2 and the second sealing ring 7-2 is further improved.

Alternatively, d2=d5 < D4, i.e. the inner diameter of the second sealing ring 7-2 is smaller than the diameter of the third inlet 4-3, but the same as the diameter of the second inlet 4-2. At this time, the second sealing rings 7-2 located at two sides of the permeation screen 3 are in direct contact, which forms a strong seal on the permeation screen 3 under the welding process, and a larger contact area between the second sealing rings 7-2 and the filtering membrane layer 2, so that the second sealing rings 7-2 can be effectively connected with the filtering membrane layer 2 in a sealing way, and the overall tightness of the permeation unit is enhanced.

In some embodiments, the diameter dimension relationship between the third sealing ring 7-3 and the second return opening 6-2, and the diameter dimension relationship between the third return opening 6-3 and the second sealing and the diameter of the liquid inlet penetrating the screen 3 and the filtering membrane layer 2 are the same. I.e. the inner diameter of the third sealing ring 7-3 is the same as the diameter of the second liquid inlet 4-2 and the diameter of the third liquid inlet 4-3. It can also be set as: the third sealing ring 7-3 has an inner diameter smaller than the second return opening diameter 6-2 but the same diameter as the third return opening 6-3. It can also be set as: the inner diameter of the third sealing ring 7-3 is smaller than the diameters of the second return port 6-2 and the third return port 6-3. It can also be set as: the inner diameter of the third sealing ring 7-3 is smaller than the diameter of the third return opening 6-3, but is the same as the diameter of the second return opening 6-2.

The utility model also provides a filter membrane package, as shown in fig. 8, after the welding of the sealing ring is completed, the filter membrane package main body structure is formed by stacking, and the edge wrapping of the periphery of the filter membrane package is formed under the encapsulation process, so that the filter membrane package integral structure is formed. The height of the welded sealing ring protruding out of the surface of the liquid inlet screen or the penetrating screen is 150-700 mu m, preferably 250-500 mu m, so that the influence on the thickness of the filtering membrane bag is reduced as much as possible while the tightness is ensured.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.

In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.

Claims (10)

1. The utility model provides a filtration membrane package unit, includes the feed liquor unit and sees through the unit, the feed liquor unit includes the feed liquor screen cloth, see through the unit including see through the screen cloth and set up the filtration membrane layer in its both sides, feed liquor screen cloth, filtration membrane layer and see through the screen cloth all to be provided with corresponding inlet, liquid outlet and return port, its characterized in that: sealing rings are respectively and oppositely arranged at the liquid outlet of the liquid inlet screen, the liquid inlet of the permeation screen and the reflux inlet of the permeation screen, and the circumferences of the liquid outlet, the liquid inlet or the reflux inlet corresponding to the sealing rings are sealed by welding; and the center of the sealing ring is a through hole which is at least partially communicated with a liquid inlet, a liquid outlet or a reflux port to be sealed, so that liquid can flow in and out.

2. The filtration membrane pack unit of claim 1, wherein: the liquid inlet, the liquid outlet and the reflux port are circular through holes, and the sealing ring is in a circular ring shape.

3. The filtration membrane pack unit of claim 2, wherein: the minimum distance between the outer edge of the sealing ring and the circumferences of the liquid inlet, the liquid outlet and the reflux port which are correspondingly sealed is not less than 1mm.

4. A filtration membrane pack unit according to claim 3, wherein: the minimum distance between the outer edge of the sealing ring and the circumferences of the liquid inlet, the liquid outlet and the reflux port which are correspondingly sealed is 2-5 mm.

5. A filtration membrane pack unit according to claim 3, wherein: the inner diameter (D1) of the sealing ring arranged at the liquid outlet of the liquid inlet screen is smaller than or equal to the diameter (D3) of the liquid outlet of the liquid inlet screen.

6. A filtration membrane pack unit according to claim 3, wherein: the inner diameter (D2) of the sealing ring arranged at the liquid inlet of the permeation screen is smaller than or equal to the liquid inlet diameter (D4) of the filtering membrane layer and the liquid inlet diameter (D5) of the permeation screen.

7. The filtration membrane pack unit of claim 1, wherein: the sealing ring is made of thermoplastic material and is selected from any one of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate and polyamide.

8. A filtration membrane pack, characterized by: comprising a plurality of the filtration membrane package units according to any one of claims 1 to 7, which are packaged after being welded and stacked to form the filtration membrane package.

9. The filtration membrane pack of claim 8, wherein: the height of the sealing ring protruding out of the surface of the liquid inlet screen or the surface of the penetrating screen is 150-700 mu m.

10. The filtration membrane pack of claim 9, wherein: the height of the sealing ring protruding out of the surface of the liquid inlet screen or the surface of the penetrating screen is 250-500 mu m.