CN216825550U - Filtering assembly - Google Patents

Abstract

The utility model relates to a filter assembly, including first end piece, second end piece and sealed a plurality of filter element of piling up in the two, this filter element includes the backup pad and the sealed first filter membrane that is fixed in its both ends face, and the both ends face of backup pad all is equipped with cyclic annular sealing, is equipped with first welding-assistant spare between the terminal surface of backup pad and first filter membrane, and first welding-assistant spare has the cyclic annular welding-assistant district that corresponds with cyclic annular sealing, and the outward flange of first filter membrane helps welding-assistant district welded fastening to cyclic annular sealing through this cyclic annular. During welding, the molten material in the annular soldering-assisting area, the molten material at the outer edge of the first filter membrane and the molten material in the annular sealing part are mixed into a whole, and after the molten materials are cooled, the annular soldering-assisting area can be in high-strength welding connection with the outer edge of the first filter membrane and the annular sealing part, namely, the high-strength welding connection between the outer edge of the first filter membrane and the annular sealing part of the support plate is realized by means of the annular soldering-assisting area of the first soldering-assisting piece.

Description

Filtering assembly

Technical Field

The utility model relates to a filter technical field, especially a filtering component.

Background

Chinese utility model patent CN213790973U provides a filter, including the inlet, the liquid outlet, the top cap, bottom and sealed filter of being fixed in between top cap and the bottom, the filter includes the membrane backup pad and seals first filter membrane and the second filter membrane of being fixed in the first surface of membrane backup pad and second surface respectively, the surface and the inlet intercommunication of first filter membrane and second filter membrane, the first surface has first through-hole, the second surface has the second through-hole, form between first surface and the second surface and first through-hole, the passageway that converges of second through-hole and liquid outlet intercommunication, the low reaches surface of first filter membrane and second filter membrane is through this passageway and liquid outlet intercommunication that converges.

During filtering, after the filtrate flows in from the liquid inlet and is filtered by the first filter membrane and the second filter membrane, the filtrate reaching the downstream surfaces of the first filter membrane and the second filter membrane flows to the liquid outlet through the first through hole, the second through hole and the confluence channel.

The filter is used for virus removal filtration application, the first filter membrane and the second filter membrane are nanoscale membranes capable of retaining viruses, and the average pore diameter is 10-100 nm. In the manufacturing process of the filter, the first filter membrane and the second filter membrane are not firmly welded with the circumferentially extending membrane sealing parts on the two end faces of the support plate, namely the first filter membrane and the second filter membrane cannot be welded and connected with the membrane sealing parts with reliable strength everywhere, but are in insufficient welding at multiple places.

The research finds that the first filter membrane and the second filter membrane cannot form effective welded connection with the membrane sealing part because the average pore diameter of the first filter membrane and the second filter membrane is between 10 and 100nm, namely the average pore diameter is small, so that the molten material of the membrane sealing part cannot be uniformly mixed with the molten material of the outer edges of the first filter membrane and the second filter membrane, namely after the molten materials are melted, the molten material of the outer edge of the first filter membrane and the molten material of the outer edge of the second filter membrane are not mixed with the molten material of the membrane sealing parts of the two end faces into a whole, and only the surfaces are in contact with each other, and after the molten materials are cooled, the connection effect with lower strength is formed between the surfaces in contact with each other.

During filtration, certain pressure difference exists between the upstream side and the downstream side of the first filter membrane and the second filter membrane, the pressure difference value reaches more than 0.3MPa, under the condition of the pressure difference, the outer edge of the first filter membrane and the outer edge of the second filter membrane which originally cannot form welding connection with the membrane sealing part and have high enough strength are quickly burst away from the first filter membrane, and filtrate to be filtered are inevitably mixed.

And in the longitudinal section direction of the first filter membrane and the second filter membrane, the filter comprises an upstream side pre-filtering layer and a downstream side separation layer in sequence, the separation layer faces the end face of the support plate, the aperture of the pre-filtering layer is relatively larger, and the separation layer is a small aperture area. During filtration, the filtrate firstly flows through the pre-filtering layer, after the pollutants with larger sizes are intercepted, the fluid flows through the separating layer again, the small-sized viruses are intercepted, namely the separating layer can be utilized most fully, meanwhile, the first filtering membrane and the second filtering membrane can be supported after being wetted, the flow direction of the fluid must face the end face of the supporting plate, and the separating layer of the first filtering membrane and the second filtering membrane, namely the small-aperture area of the separating layer, must face the end face of the supporting plate. This has further increaseed the welding degree of difficulty between first filter membrane and second filter membrane and the membrane sealing, and it has further reduced the welded connection intensity between first filter membrane and second filter membrane and the membrane sealing promptly.

The welded structure or the welding mode between the membrane sealing parts of filter membrane and backup pad need to be improved to ensure that can form the welding connection that intensity is enough high between filter membrane and corresponding membrane sealing part, can resist under the filtration operating mode, the pressure differential between the upper and lower side of filter membrane, make can form effectual sealing connection all the time between corresponding welding position, avoid filtrating and wait that the filtrate mixes, thereby the filter can provide effectual filtration performance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to reach the purpose provides a new filtering component, its welding structure or the welding mode between the membrane sealing through improving the filter membrane and backup pad to ensure to form the enough high welded connection of intensity between filter membrane and corresponding membrane sealing, make and to form effectual sealing connection all the time between corresponding welding position.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a filtering component comprises a liquid inlet, a liquid outlet, a first end piece, a second end piece and a plurality of filtering elements stacked between the liquid inlet and the liquid outlet in a sealing mode, wherein each filtering element comprises a supporting plate and a first filtering membrane fixed on two end faces of the supporting plate in a sealing mode, the upstream side of the first filtering membrane is communicated with the liquid inlet, the supporting plate is provided with a filtrate discharge channel communicated with the downstream side and the liquid outlet of the first filtering membrane, two end faces of the supporting plate are respectively provided with an annular sealing portion, each first filtering membrane comprises a pre-filtering layer on the upstream side and a separating layer on the downstream side, the aperture of each separating layer is smaller than that of each pre-filtering layer, the separating layer faces the end face of the supporting plate, the PMI average aperture of each first filtering membrane is 10-100nm, a first welding-assisting piece is arranged between the end face of the supporting plate and the first filtering membrane, and each first welding-assisting piece is provided with an annular welding-assisting area corresponding to the annular sealing portion, the outer edge of the first filter membrane is welded and fixed to the annular sealing part through the annular welding assisting area.

In the filter assembly that this application provided, on the longitudinal section direction of first filter membrane, include the prefilter layer of upstream side and the separating layer of downstream side in proper order, and this separating layer is towards the terminal surface of backup pad, and the both ends face of backup pad all is equipped with cyclic annular sealing portion to set up first soldering-aid spare between the terminal surface of backup pad and first filter membrane, this first soldering-aid spare includes the cyclic annular soldering-aid district that corresponds with cyclic annular sealing portion, and the position of first soldering-aid spare corresponds the annular region of cyclic annular sealing portion promptly and constitutes its cyclic annular soldering-aid district.

During welding, after the outer edge of the first filter membrane, the annular welding-assisting area and the annular sealing part of the support plate are melted, one side of a molten material of the annular welding-assisting area and the molten material of the outer edge of the first filter membrane are uniformly mixed into a whole, the other side of the molten material of the annular welding-assisting area and the molten material of the annular sealing part are also uniformly mixed into a whole, after all the molten materials are cooled, one side of the annular welding-assisting area and the outer edge of the first filter membrane are welded and connected into a whole, and the other side of the annular welding-assisting area and the annular sealing part are welded and connected into a whole. Because the molten material in cyclic annular soldering-assistant district has all mixed integratively with the molten material of the outward flange of first filter membrane, the molten material of cyclic annular sealing portion, so after the molten material cooling, cyclic annular soldering-assistant district can all form high strength's welded connection with the outward flange of first filter membrane and cyclic annular sealing portion to this welded connection department is effective. That is, in the present application, with the help of the function of the annular weld-assist region of the first weld-assist member, high-strength weld-connection performance between the outer edge of the first filter membrane and the annular seal portion of the support plate is achieved.

Further, the average pore diameter of the first weldment is not less than 1 μm.

The average pore diameter of the first welding-assistant part is more than or equal to 1 mu m, the average pore diameter of a partial area forming the annular welding-assistant area of the first welding-assistant part is more than or equal to 1 mu m, the average pore diameter is at least more than 10 times of the PMI average pore diameter of the first filter membrane, namely the average pore diameter of the first welding-assistant part is large enough, so that when the outer edge of the first filter membrane, the annular welding-assistant area of the first welding-assistant part and the annular sealing part of the support plate are fully melted, the molten material of the annular welding-assistant area and the molten material of the outer edge of the first filter membrane, the molten material of the annular welding-assistant area and the molten material of the annular sealing part can be uniformly mixed into a whole, after all the molten materials are cooled, the outer edge of the first filter membrane and the annular welding-assistant area of the first welding-assistant part form welding connection with high enough strength, and the annular welding-assistant area of the first welding-assistant part and the annular sealing part of the support plate form welding connection with high enough strength, the annular welding-assisting area has an intermediate bridging function, so that reliable welding connection is formed between the outer edge of the first filter membrane and the annular sealing part which cannot be reliably welded and connected originally, the welding connection strength can bear the pressure difference of more than 0.3MPa between the upstream and the downstream of the first filter membrane, and the use condition of a customer can be met.

Further, the first welding-assistant piece is made of polyester non-woven fabric, and the thickness of the first welding-assistant piece is 80-160 mu m.

The welding connection performance of the polyester non-woven fabric is good, so when the first welding-assistant piece adopts the polyester non-woven fabric, the welding connection performance of the first welding-assistant piece corresponding to the annular region of the annular sealing part, namely the welding connection performance between the annular welding-assistant area and the outer edge of the first filter membrane and between the annular welding-assistant area and the annular sealing part of the support plate is good, and the sealing connection performance between the annular welding-assistant area and the outer edge of the first filter membrane and between the annular welding-assistant area and the annular sealing part are improved; and the polyester non-woven fabric with the thickness of 80-160 mu m is used as the first welding-assistant piece, so that enough molten materials are contained in an annular area, namely an annular welding-assistant area, of the annular sealing part of the support plate after the first welding-assistant piece is molten, the enough molten materials are fully mixed with the molten materials on the outer edge of the first filter membrane and the molten materials on the annular sealing part of the support plate, and the welding connection strength between the annular welding-assistant area and the outer edge of the first filter membrane and between the annular welding-assistant area and the annular sealing part of the support plate is improved.

Further, the width of the annular sealing part is 2-3 mm.

The width of the annular sealing part is 2-3mm, correspondingly, the width of an annular welding-assisting area, which is an annular area corresponding to the annular sealing part, of the first welding-assisting piece is also 2-3mm, and the width of an area where the outer edge of the first filter membrane is welded with the annular welding-assisting area is also 2-3mm, namely, the welding areas between the first filter membrane and the first welding-assisting piece and between the first welding-assisting piece and the annular sealing part are wide enough, so that the welding connection strength between the first filter membrane and the first welding-assisting piece and between the first welding-assisting piece and the annular sealing part is improved, and the leakage risk is reduced.

Furthermore, the two end faces of the supporting plate are arranged in an area surrounded by the annular sealing part, a plurality of flow guide ribs and a plurality of flow guide grooves are arranged in the area, the flow guide ribs and the flow guide grooves are spaced from each other, and the height difference between the end face of the annular sealing part and the end face of each flow guide rib is 0.3-0.6 mm.

The height difference between the end face of the annular sealing part and the end face of the flow guide rib is 0.3-0.6mm, on one hand, enough molten materials can be provided for the annular sealing part, so that the annular sealing part has enough molten materials and the molten materials in the annular welding-assisting area of the first welding-assisting piece are fully mixed into a whole, and then after the molten materials are cooled, welding connection with enough strength can be formed between the annular sealing part and the first welding-assisting piece, on the other hand, the phenomenon that the distance between the first welding-assisting piece and the first filter membrane and the flow guide rib is too large, so that under the action of pressure difference, the bending deformation amplitude of the annular sealing-assisting piece and the first filter membrane towards the end face of the support plate is too large, and the stretching action on the adjacent parts of the annular sealing-assisting piece and the first filter membrane close to the support plate is too large, so that the adjacent parts of the welding connection area are damaged, and sealing is failed.

Furthermore, water conservancy diversion muscle and water conservancy diversion recess parallel extension, cyclic annular sealing part is including relative first border and the second border that sets up, the extending direction on first border and second border is parallel with the extending direction on water conservancy diversion muscle and water conservancy diversion recess, and with the inner wall on first border and the inner wall on second border directly link to each other be the water conservancy diversion muscle.

In the region enclosed by the annular sealing part, the diversion rib is directly adjacent to the annular sealing part, namely the annular sealing part is inward, firstly the diversion rib with slightly lower height is arranged, then the diversion groove with lower height is arranged, namely the annular sealing part is inward, the height change of each part is realized by two gradients, the diversion groove with the lowest height is not directly and rapidly reduced from the annular sealing part with the highest height, therefore, under the action of pressure difference between the upstream side and the downstream side, the region near the outer edge of the first filter membrane forming the welded connection is subjected to certain stretching action, the region near the outer edge can abut against the end surface of the diversion rib directly adjacent to the annular sealing part, namely, after the stretching action of the region near the outer edge, the downward bending deformation amplitude is limited by the diversion rib, and the downward bending cannot be continued after the region abuts against the end surface of the diversion rib, so that the phenomenon that the region near the outer edge of the first filter membrane forming the welded connection is damaged by the excessive stretching action is avoided A domain.

Furthermore, the first welding-assistant piece is also provided with a buffer area which is integrally formed at the inner side of the annular welding-assistant area, and the buffer area is positioned in an area surrounded by the annular sealing part corresponding to two end surfaces of the support plate so as to separate the first filter membrane from the end surface of the support plate.

The buffer area of the first welding-assistant piece separates the first filter membrane from the end face of the support plate, so that in the filtering process, under the condition that a pressure difference exists between the upstream surface and the downstream surface of the first filter membrane, when the middle area bends towards the end face of the support plate and approaches, the buffer area of the first welding-assistant piece which is permeable to fluid is in direct contact with the downstream surface of the middle area of the first filter membrane, the friction acting force between the buffer area and the first filter membrane is more moderate, and the friction acting strength is small, so that the downstream surface of the middle area of the first filter membrane is less in friction damage, and the effect of protecting the first filter membrane is achieved.

Furthermore, the area of the buffer area of the first welding-aid member and the area of the area, corresponding to the annular sealing part, of the first filter membrane are both larger than the area of the area, corresponding to the annular sealing part, of the first filter membrane.

The arrangement of the area relation enables the buffer area of the first welding-aid member and the first filter membrane which are sealed and fixed to slightly bulge outwards in the direction away from the end face of the support plate, which is equivalent to slightly increasing the distance between the buffer area of the first welding-aid member and the end face of the first filter membrane and the end face of the support plate in the area surrounded by the annular sealing part, so that when the first filter membrane approaches the end face of the support plate due to the pressure difference between the upstream surface and the downstream surface of the first filter membrane, the pressure difference needs to offset the outwards bulging distance of the buffer area of the first filter membrane and the buffer area of the first welding-aid member, and therefore the close contact degree of the buffer area of the first filter membrane and the buffer area of the first welding-aid member and the end face of the support plate can be further reduced, the first filter membrane is protected, and the flow resistance is also reduced.

The filter membrane sealing device further comprises a second welding-assistant piece and a second filter membrane, wherein the second welding-assistant piece and the second filter membrane are positioned on the outer side of the first filter membrane, the second welding-assistant piece is provided with an annular welding-assistant area corresponding to the annular sealing portion, and the outer edge of the second filter membrane is connected with the outer edge of the first filter membrane in a sealing mode through the annular welding-assistant area of the second welding-assistant piece.

Add and establish the second filter membrane, can be under the condition that does not increase filter assembly's volume, increase the pollutant carrying capacity, set up the second between first filter membrane and the second filter membrane and help the weldment, and the outward flange of first filter membrane and the outward flange of second filter membrane just to the cyclic annular of second and help the weldment and weld the district, the melting back, the melting material of the cyclic annular of second helps the weldment and helps the melting material of the outward flange of first filter membrane, the melting material of second filter membrane all mixes integratively, all melting material cooling backs, the second helps the weldment and all forms effectual welded connection with the outward flange of first filter membrane and the outward flange of second filter membrane.

Further, the filter membrane comprises a second welding-assistant piece and a second filter membrane which are positioned on the outer side of the first filter membrane;

the annular sealing part comprises a first annular sealing part and a second annular sealing part positioned on the periphery of the first annular sealing part, and the second annular sealing part is higher than the first annular sealing part;

the outer edge of the first filter membrane and the annular soldering-assisted area of the first soldering-assisted part are fixed to the first annular sealing part by welding, and the outer edge of the second filter membrane and the annular soldering-assisted area of the second soldering-assisted part are fixed to the second annular sealing part by welding.

The second filter membrane and the second welding-aid piece are additionally arranged, so that the pollutant holding capacity can be increased under the condition that the volume of the filter assembly is not increased; and, the both ends face of backup pad all sets up the first cyclic annular sealing portion and the cyclic annular sealing portion that stagger each other, the two is used for the cyclic annular soldering-assistant district of welded connection first soldering-assistant spare and the outward flange of first filter membrane, the cyclic annular soldering-assistant district of second soldering-assistant spare and the outward flange of second filter membrane respectively, the cyclic annular soldering-assistant district of first soldering-assistant spare and the outward flange of first filter membrane and the cyclic annular soldering-assistant district of second soldering-assistant spare and the outward flange of second filter membrane separately weld promptly, can avoid the number of piles of the part of welding at same position too much, lead to the problem that the second filter membrane far away from the terminal surface of backup pad welds infirm, rosin joint.

The utility model provides an among the filtering component, on the longitudinal section direction of first filter membrane, include the pre-filtration layer of upstream side and the separating layer of downstream side in proper order, and this separating layer is towards the terminal surface of backup pad, the PMI mean pore diameter of this first filter membrane is 10-100nm, the both ends face of backup pad all is equipped with cyclic annular sealing, and set up first weldment that helps between the terminal surface of backup pad and first filter membrane, this first weldment that helps includes the cyclic annular welding-assistant district that corresponds with cyclic annular sealing, the position of first weldment that helps promptly constitutes this cyclic annular welding-assistant district corresponding to the annular region of cyclic annular sealing.

During welding, after the outer edge of the first filter membrane, the annular welding-assisting area and the annular sealing part of the support plate are melted, one side of a molten material of the annular welding-assisting area and the molten material of the outer edge of the first filter membrane are uniformly mixed into a whole, the other side of the molten material of the annular welding-assisting area and the molten material of the annular sealing part are also uniformly mixed into a whole, after all the molten materials are cooled, one side of the annular welding-assisting area and the outer edge of the first filter membrane are welded and connected into a whole, and the other side of the annular welding-assisting area and the annular sealing part are welded and connected into a whole. Because the molten material in the cyclic annular weld-assist area has all mixed integratively with the molten material of the outward flange of first filter membrane, the molten material of cyclic annular sealing portion, and the molten material in cyclic annular weld-assist area fully mixes in the molten material of the outward flange of first filter membrane promptly, also fully mixes in the molten material of cyclic annular sealing portion, so after the molten material cooling, cyclic annular weld-assist area can all form high strength welded connection with the outward flange of first filter membrane and cyclic annular sealing portion to this welded connection department is effective. In other words, in the present application, the high-strength welding connection performance between the outer edge of the first filter membrane and the annular sealing portion of the support plate is realized by the aid of the welding assisting function of the annular welding assisting area of the first welding assisting element.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

FIGS. 1 and 2 are two-dimensional perspective views of a filter assembly provided by the present invention;

FIG. 3 is a cross-sectional view of the filter assembly provided in FIGS. 1 and 2;

FIG. 4 is a schematic structural view of a first end member of a filter assembly provided herein;

FIG. 5 is a schematic structural view of a second end member of the filter assembly provided herein;

FIG. 6 is a schematic view of a first filter element of the filter assembly provided herein;

FIG. 7 is a half-sectional isometric view of the filter element provided in FIG. 6;

FIG. 7A is an enlarged view of a portion of FIG. 7A;

FIG. 8 is a schematic view of the support plate of the filter assembly of FIG. 6;

FIG. 8B is an enlarged partial view taken at B in FIG. 8;

FIG. 9 is an exploded view of the filter element provided in FIG. 6;

FIG. 10 is an exploded view of a second filter element of the filter assembly provided herein;

FIG. 11 is an exploded view of a third filter element of the filter assembly provided herein;

FIG. 11C is an enlarged partial view at C of FIG. 11;

FIG. 12 is an exploded view of a fourth filter element of the filter assembly provided herein;

fig. 13 is an exploded view of a fifth filter element of the filter assembly provided herein.

In the figure, 100-filter assembly, 1-first end piece, 11-first through hole, 12-second through hole, 13-fifth through hole, 111-first seal, 121-second seal, 131-fifth seal, 14-first annular sealing rib, 15-first sealing rib, 2-second end piece, 21-third through hole, 22-fourth through hole, 23-sixth through hole, 211-third seal, 221-fourth seal, 231-sixth seal, 24-second annular sealing rib, 25-second sealing rib, 3-filter element, 31-support plate, 30-annular seal, 301-first boundary, 302-second boundary, 30A-first annular seal, 30B-second annular seal, 310-filtrate discharge channel, 311-first through hole, 312-second through hole, 313-third through hole, 314-third annular sealing rib, 315-third sealing rib, 316-flow guiding rib, 317-flow guiding groove, 318-through hole, 319-confluence hole, 32-first filter membrane, 33-second filter membrane, 34-first soldering-aid piece, 35-second soldering-aid piece, 341, 351-annular soldering-aid area, 342, 352-buffer area.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A filter assembly 100, as shown in fig. 1-3, includes a first end member 1, a second end member 2, and a plurality of filter elements 3 sealingly stacked between the first and second end members 1, 2.

As shown in fig. 4, the first end piece 1 is a plate-like structure having a first through hole 11, a second through hole 12 and a fifth through hole 13; the inner surface of the first end piece 1 is provided with a first annular sealing rib 14 surrounding the peripheries of the first end piece 1 and the second end piece 1, and a first sealing rib 15 positioned inside the first annular sealing rib 14, wherein the first sealing rib 15 is L-shaped, two ends of the first sealing rib 15 are connected with the first annular sealing rib 14 in a sealing mode, and the first sealing rib 15 separates the first through hole 11 and the fifth through hole 13 from the second through hole 12.

As shown in fig. 5, the second end piece 2 is a plate-like structure having a third through hole 21, a fourth through hole 22 and a sixth through hole 23; and, the inner surface of the second end member 2 has a second annular sealing rib 24 and a second sealing rib 25 located inside the second annular sealing rib 24, the second sealing rib 25 is L-shaped, two ends of the second sealing rib are connected with the second annular sealing rib 24 in a sealing manner, and the second sealing rib 25 separates the third via hole 21 and the sixth via hole 23 from the fourth via hole 22.

As shown in fig. 6, 7A and 9, the first filter element 3 includes a support plate 31 and first filter membranes 32 hermetically fixed on two end surfaces thereof, and the first filter membranes 32 on two end surfaces are both a layer, and are integrally laid flat and extend in parallel with the first end member 1 and the second end member 2. The first filter 32 includes a pre-filter layer on the upstream side and a separation layer on the downstream side, wherein the pore size of the separation layer is smaller than that of the pre-filter layer, and the pre-filter layer is used for trapping pollutants with slightly larger size, such as pollutants with particle size above 100 nm; the separation layer is the area that actually functions as a virus trap, facing the end face of the support plate 31. The PMI average pore size of the first filter membrane 32 is 10-100nm, and the parameter is measured by a pore size distribution tester, which can ensure that the first filter membrane 32 can provide more than 99% of virus retention efficiency.

As shown in fig. 8 and 8B, the support plate 31 has a filtrate discharge channel 310 communicating with the downstream surface of the first filter membrane 32, a first through hole 311 communicating with the first and third via holes 11 and 21, a second through hole 312 communicating with the second and fourth via holes 12 and 22, and a third through hole 313 communicating with the fifth and sixth via holes 13 and 23, wherein the second through hole 312 communicates with the filtrate discharge channel 310.

The two end faces of the support plate 31 have a third annular sealing rib 314 facing the first annular sealing rib 14 and a third sealing rib 315 facing the first sealing rib 15, and the third sealing rib 315 separates the second through hole 312 from the first through hole 311 and the third through hole 313, that is, the second through hole 312 is sealed from the first through hole 311 and the second through hole 312 is sealed from the third through hole 313.

The adjacent filter elements 3 are connected in a sealing manner through a third annular sealing rib 314 and a third sealing rib 315, and are connected in a sealing manner through the third annular sealing rib 314, the third sealing rib 315, the first annular sealing rib 14 of the first end part 1, the second annular sealing rib 24 of the first sealing rib 15 and the second end part 2, and the second sealing rib 25, that is, through the sealing ribs of the two structures, the filter elements 3 are stacked between the first end part 1 and the second end part 2 in a sealing manner, so that an integrated and complete filter assembly 100 is formed.

In the filter assembly 100, the first through hole 11 of the first end part 1 and the third through hole 21 of the second end part 2 are communicated to form a liquid inlet, the second through hole 12 of the first end part 1 and the fourth through hole 22 of the second end part 2 are communicated to form a liquid outlet, and the fifth through hole 13 of the first end part 1 and the sixth through hole 23 of the second end part 2 are communicated to form an air outlet. Because the liquid inlet, the liquid outlet and the exhaust port of the filtering component 100 are all positioned on the end surfaces, a plurality of filtering components 100 can be mutually stacked, and the filtering area is conveniently and linearly enlarged.

When a plurality of filter assemblies 100 are stacked up and down to enlarge the filtering area, first, the first, second, and fifth sealing members 111, 121, and 131 are respectively installed on the outer peripheries of the first, second, and fifth through holes 11, 12, and 13 on the outer surface side of the first end member 1, and the third, fourth, and sixth sealing members 211, 221, and 231 are respectively installed on the outer surface side of the third, fourth, and sixth through holes 21, 22, and 23 on the outer surface side of the second end member 2, and then, the adjacent filter assemblies 100 are stacked up and down, the second end member 2 of the upper filter assembly 100 is positioned on the upper surface of the first end member 1 of the lower filter assembly 100, and the plurality of filter assemblies 100 are pressed by an external device, so that the first, second, and fifth sealing members 111, 121, and 131 on the lower side form compression seals with the third, fourth, and sixth sealing members 211, 221, and 231 on the upper side, respectively, correspondingly, the liquid inlets, the liquid outlets and the air outlets of the upper and lower adjacent filter assemblies 100 are communicated.

The liquid inlets described above are all communicated with the upstream surface of the first filter membrane 32, the liquid outlets are communicated with the filtrate discharge passage 310 and the downstream surface of the first filter membrane 32, and the gas outlets are communicated with the space between the adjacent filter elements 3, i.e., the upstream side of the first filter membrane 32. Wherein the upstream surface of the first filter membrane 32 refers to a side surface thereof facing away from the support plate 31, and the downstream surface of the first filter membrane 32 refers to a side surface thereof facing toward the support plate 31.

During filtration, the liquid to be filtered flows from the upstream side to the downstream side of the first filter membrane 32, the pollutants with larger sizes in the fluid are firstly intercepted by the pre-filter layer of the first filter membrane 32, then the fluid continuously flows through the separation layer, the small-sized virus pollutants are intercepted by the separation layer, the service life of the first filter membrane 32 can be prolonged, and the problem that the separation layer is prematurely blocked by the large-sized pollutants and is prematurely scrapped, so that the virus contamination capacity of the separation layer cannot be fully utilized is avoided.

As shown in fig. 8 and 8B, both end surfaces of the support plate 31 are provided with annular seal portions 30, and, as shown in fig. 7A and 9, a first soldering aid 34 is further provided between the end surface of the support plate 31 and the first filter membrane 32, the first soldering aid 34 having an annular soldering aid region 341 corresponding to the annular seal portion 30. The annular welding-assisted region 341 of the first welding-assisted member 34 is an annular region corresponding to the annular sealing portion 30, and the outer edge of the first filter membrane 32 is welded and fixed to the annular sealing portion 30 through the annular welding-assisted region 341.

During welding, after the outer edge of the first filter membrane 32, the annular welding-assisting zone 341 and the annular sealing part 30 of the support plate 31 are melted, one side of the molten material of the annular welding-assisting zone 341 and the molten material of the outer edge of the first filter membrane 32 are uniformly mixed into a whole, namely, the molten material of the annular welding-assisting zone 341 flows into the molten material of the outer edge of the first filter membrane 32, the molten material of the outer edge of the first filter membrane 32 also flows into the molten material of the annular welding-assisting zone 341, the other side of the molten material of the annular welding-assisting zone 341 and the molten material of the annular sealing part 30 are also uniformly mixed into a whole, namely, the molten material of the annular welding-assisting zone 341 flows into the molten material of the annular sealing part 30, the molten material of the annular sealing part 30 also flows into the molten material of the annular welding-assisting zone 341, and after all the molten materials are cooled, one side of the annular welding-assisting zone 341 and the outer edge of the first filter membrane 32 are welded into a whole, the other side is welded and connected with the annular sealing part 30 into a whole.

Since the molten material of the annular weld-assist region 341 is mixed with the molten material of the outer edge of the first filter membrane 32 and the molten material of the annular seal portion 30, that is, the molten material of the annular weld-assist region 341 is mixed into the molten material of the outer edge of the first filter membrane 32 and the molten material of the annular seal portion 30, after the molten material is cooled, the annular weld-assist region 341 can form a high-strength welded connection with the outer edge of the first filter membrane 32 and the annular seal portion 30, and the welded connection is effective. That is, in the present application, the high-strength welding connection performance between the outer edge of the first filter membrane 32 and the annular seal portion 30 of the support plate 31 is achieved by the welding assist function of the annular welding assist region 341 of the first welding assist member 34.

In this embodiment, the first welding assistant fitting 34 may only include the annular welding assistant area 341, as shown in fig. 9, the annular welding assistant area 341 is a notch without a solid portion.

Preferably, the average pore diameter of the first soldering assistant member 34 is not less than 1 μm, that is, the average pore diameter of the first soldering assistant member 341 is greater than or equal to 1 μm, then, the average pore diameter of the partial region constituting the annular soldering assistant region 341 is also greater than or equal to 1 μm, and the average pore diameter is at least 10 times or more of the PMI average pore diameter of the first filter membrane 32, that is, the average pore diameter of the first soldering assistant member 34 and the annular soldering assistant region 341 thereof is sufficiently large, so that when the outer edge of the first filter membrane 32, the annular soldering assistant region 341 of the first soldering assistant member 34, and the annular sealing part 30 of the support plate 31 are sufficiently melted, the melted material of the annular soldering assistant region 341 and the melted material of the outer edge of the first filter membrane 32, the melted material of the annular soldering assistant region 341 and the melted material of the annular sealing part 30 can be uniformly mixed together, that is, that the melted material of the outer edge of the first filter membrane 32 and the melted material of the annular soldering assistant region 341 can flow into each other, the molten material of the annular soldering assisting area 341 and the molten material of the annular sealing portion 30 can flow into each other, after all the molten materials are cooled, a welding connection with a high enough strength can be formed between the outer edge of the first filter membrane 32 and the annular soldering assisting area 341 of the first soldering assisting piece 34, and a welding connection with a high enough strength can be formed between the annular soldering assisting area 341 of the first soldering assisting piece 34 and the annular sealing portion 30 of the support plate 31, namely, the annular soldering assisting area 341 plays a middle bridging function, so that a reliable welding connection can be formed between the outer edge of the first filter membrane 32 and the annular sealing portion 30 which cannot form a reliable welding connection originally, the welding connection strength can bear the pressure difference of more than 0.3MPa between the upstream and the downstream of the first filter membrane 32, and the use conditions of customers can be met.

For example, the average pore size of the first weldment 34 may be 1 μm, 1.2 μm, 1.5 μm, 2 μm, 5 μm, 10 μm and larger.

Preferably, the first welding aid 34 is made of polyester non-woven fabric, and because the welding connection performance of the polyester non-woven fabric is relatively good, when the first welding aid 34 is made of polyester non-woven fabric, the welding connection performance between the annular welding aid 341, which is an annular region of the annular sealing portion 30, and the outer edge of the first filter membrane 32, and between the annular welding aid 341 and the annular sealing portion 30 of the support plate 31 is relatively good, and the sealing connection performance between the annular welding aid 341 and the outer edge of the first filter membrane 32, and between the annular welding aid 341 and the annular sealing portion 30 is greatly improved.

And, a polyester non-woven fabric with a thickness of 80-160 μm is used as the first soldering assistant member 34 to ensure that the annular region of the annular sealing part 30 of the support plate 31, i.e. the annular soldering assistant region 341, of the first soldering assistant member 34 has enough molten material after being melted, so that the molten material has enough molten material to be fully mixed with the molten material of the outer edge of the first filter membrane 32 and the molten material of the annular sealing part 30 of the support plate 31, and the welding connection strength between the annular soldering assistant region 341 and the outer edge of the first filter membrane 32 and between the annular soldering assistant region 341 and the annular sealing part 30 of the support plate 31 is improved.

Specifically, the thickness of the polyester nonwoven fabric constituting the first weldment 34 may be 80 μm, 100 μm, 120 μm, 150 μm, 160 μm, or the like.

Further, the width of the annular sealing portion 30 is set to be 2-3mm, and accordingly, the width of the annular welding-assisted area 341, which is the annular area of the first welding-assisted part 34 corresponding to the annular sealing portion 30, is also 2-3mm, and the width of the area where the outer edge of the first filter membrane 32 and the annular welding-assisted area 341 form the welding connection is also 2-3mm, that is, the area of the welding connection between the first filter membrane 32 and the first welding-assisted part 34 and between the first welding-assisted part 34 and the annular sealing portion 30 is sufficiently wide, which also improves the strength of the welding connection between the first filter membrane 32 and the first welding-assisted part 34 and between the first welding-assisted part 34 and the annular sealing portion 30, and reduces the leakage risk.

For example, the width of the annular seal 30 may be 2mm, 2.5mm, 2.8mm, 3mm, and so forth.

In other embodiments, as shown in fig. 8 and 8B, a plurality of flow guiding ribs 316 and a plurality of flow guiding grooves 317 are disposed in the region surrounded by the annular sealing portion 30 at the two end surfaces of the supporting plate 31, the flow guiding ribs 316 and the flow guiding grooves 317 are spaced from each other, and the height difference between the end surface of the annular sealing portion 30 and the end surface of the flow guiding ribs 317 is 0.3-0.6mm, which on one hand ensures that the welding strength between the outer edge of the first filter membrane 32 and the annular soldering region 341 of the first isolation layer 34 and the annular sealing portion 30 is sufficiently high to achieve effective sealing connection of the three, on the other hand, prevents the distance between the first isolation layer 34 and the first filter membrane 32 and the flow guiding ribs 316 from being too large, so that the bending deformation amplitude of the first filter membrane 32 and the first isolation layer 34 toward the end surface close to the supporting plate 31 is too large under the pressure difference, and the stretching action on the portions of the two adjacent to the welding sealing region is too large, causing the breakage of the portion near the weld seal area and failure of the seal.

For example, the height difference between the end face of the annular seal portion 30 and the end face of the air guide rib 317 is 0.3mm, 0.4mm, 0.5mm, 0.6mm, or the like.

The flow guiding ribs 316 and the flow guiding grooves 317 extend in parallel, the annular sealing portion 30 includes a first boundary 301 and a second boundary 302 which are oppositely arranged, the annular sealing portion 30 is rectangular, and two opposite long sides form the first boundary 301 and the second boundary 302. The extending directions of the first boundary 301 and the second boundary 302 are parallel to the extending directions of the flow guiding ribs 316 and the flow guiding grooves 317, and the flow guiding ribs 316 are directly connected with the inner wall of the first boundary 301 and the inner wall of the second boundary 302.

In the area surrounded by the annular sealing portion 30, directly adjacent to the annular sealing portion 30, are the flow guiding ribs 316, that is, inward from the annular sealing portion 30, firstly the flow guiding ribs 316 with a slightly lower height, and then the groove bottoms of the flow guiding grooves 317 with a lower height, that is, inward from the annular sealing portion 30, the height change of each component is realized by two gradients, instead of directly and steeply reducing from the annular sealing portion 30 with the largest height to the groove bottom of the flow guiding grooves 317 with the smallest height, so that under the action of the pressure difference between the upstream side and the downstream side, after the outer edge of the first filter membrane 32 and the area near the annular weld-assist area 341 of the first isolation layer 34 are subjected to a certain stretching action, the area near the above can abut against the end face of the flow guiding ribs 316, that after the area near the above is subjected to the stretching action, the downward bending deformation amplitude is limited, and cannot continue to bend downward after abutting against the end face of the flow guiding ribs 316, thereby avoiding damage to the outer edge of the first filter membrane 32 and the vicinity of the annular weld-assist region 341 of the first separator 34 due to overstretching.

In addition, a plurality of through holes 318 are formed on the outer periphery of the annular sealing portion 30, the flow guiding ribs 316 and the flow guiding grooves 317 towards the outside of one end portion of the first through hole 311, and the plurality of through holes 318 are used for communicating the gap between the adjacent filter elements 3 and the inner cavity of the whole filter assembly 100, so that the communication performance of the inner part and the dispersion uniformity of the fluid to be filtered in the inner part are improved.

And, a confluence hole 319 is formed at the end of each of the plurality of guide grooves 317, and the confluence hole 319 connects the corresponding guide groove 317 with the filtrate discharge channel 310 for rapidly merging the filtrate from the guide groove 317 into the filtrate discharge channel 310.

In another embodiment, as shown in fig. 10, a second welding aid 35 and a second filter membrane 33 are further provided outside the first filter membrane 32, the second welding aid 35 has an annular welding aid area 351 corresponding to the annular sealing part 30, and the outer edge of the second filter membrane 33 is connected with the outer edge of the first filter membrane 32 in a sealing manner through the annular welding aid area 351 of the second welding aid 35. The width of the annular seal portion 30 is also 2 to 3 mm.

Similarly, in this embodiment, the first welding assistant member 34 only includes the annular welding assistant region 341, that is, the inside of the annular welding assistant region 341 is a notch without a solid portion. The second soldering aid 35 also only includes the annular soldering aid area 351, i.e. the inside of the annular soldering aid area 351 is a gap without a solid part. Also, fig. 9 provides a filter element 3 in which the average pore size, material, and thickness of the first weldment aid 34 are suitable for the first and second weldment aids 34 and 35 in the present embodiment.

Compared with the filter element 3 provided in fig. 6, 7A and 9, in the filter element 3 provided in this embodiment, the second filter membrane 33 is additionally provided outside the first filter membrane 32, the dirt holding capacity can be increased without increasing the volume of the filter assembly 100, the second welding-assistant member 35 is provided between the first filter membrane 32 and the second filter membrane 33, the outer edge of the first filter membrane 32 and the outer edge of the second filter membrane 33 are opposite to the annular welding-assistant region 351 of the second welding-assistant member 35, after melting, the molten material of the annular welding-assistant region 351 of the second welding-assistant member 35, the molten material of the outer edge of the first filter membrane 32 and the molten material of the second filter membrane 33 are mixed into a whole, and after all the molten materials are cooled, the second welding-assistant member 35 and the first filter membrane 32 and the second filter membrane 33 are effectively welded and connected.

In a further embodiment of the present application, as shown in fig. 11 and 11C, in the filter element 3, both end surfaces of the support plate 31 are also provided with the first filter membrane 32 and the second filter membrane 33, the annular sealing portions 30 at both end surfaces of the support plate 31 include a first annular sealing portion 30A and a second annular sealing portion 30B, wherein the second annular sealing portion 30B is located at the outer periphery of the first annular sealing portion 30A and is higher than the first annular sealing portion 30A, that is, the first annular sealing portion 30A and the second annular sealing portion 30B are arranged in a stepped manner, the outer edge of the first filter membrane 32 is fixed to the first annular sealing portion 30A by welding via the first weld-assist members 34 and the annular weld-assist regions 341, and the outer edge of the second filter membrane 33 and the annular weld-assist regions 351 of the second weld-assist members 35 are fixed to the second annular sealing portion 30B by welding.

Compared with the filter element 3 provided in fig. 6, 7A and 9, in the filter element 3 provided in this embodiment, the second filter membrane 33 and the second welding-aid member 35 are additionally provided outside the first filter membrane 32, so that the dirt holding capacity can be increased without increasing the volume of the filter assembly 100.

Compared with the filter element 3 provided in fig. 10, the first annular sealing portion 30A and the second annular sealing portion 30B which are staggered from each other are respectively disposed on both end surfaces of the support plate 31, and are respectively used for welding and connecting the annular soldering assistant region 341 of the first soldering assistant piece 34 and the outer edge of the first filter membrane 32, and the annular soldering assistant region 351 of the second soldering assistant piece 35 and the outer edge of the second filter membrane 33, that is, the annular soldering assistant region 341 of the first soldering assistant piece 34 and the outer edge of the first filter membrane 32 are separately welded with the annular soldering assistant region 351 of the second soldering assistant piece 35 and the outer edge of the second filter membrane 33, so that the problems of weak welding and false welding of the second filter membrane 33 which is far from the end surface of the support plate 31 due to the excessive number of layers of the components which need to be welded at the same position can be avoided.

In this embodiment, since the first annular seal portion 30A and the second annular seal portion 30B are spatially displaced, the size of the first welding aid 34 is smaller than that of the second welding aid 35, and the size of the first filter membrane 32 is smaller than that of the second filter membrane 33.

Similarly, in the present embodiment, the first soldering aid 34 only includes the annular soldering aid 341, i.e. the inside of the annular soldering aid 341 is a gap without a solid portion. The second soldering aid 35 also only includes the annular soldering aid area 351, i.e. the inside of the annular soldering aid area 351 is a gap without a solid part. Also, fig. 9 provides a filter element 3 in which the average pore size, material, and thickness of the first weldment aid 34 are suitable for the first and second weldment aids 34 and 35 in the present embodiment.

In other embodiments of the present application, such as the filter element 3 shown in fig. 12, the first soldering aid 34 further has a buffer zone 342 integrally formed inside the annular soldering aid 341, i.e. the annular soldering aid 341 is no longer a notch structure but a solid part made of the same material as the annular soldering aid 341 and constituting the buffer zone 342.

The buffer area 342 is located in the area surrounded by the annular sealing portion 30 corresponding to the two end faces of the support plate 31 to separate the end faces of the first filter membrane 32 and the support plate 31, that is, the buffer area 342 separates the downstream surface of the middle area of the first filter membrane 32 and the area surrounded by the annular sealing portion 30 of the two end faces of the support plate 31, so that in the case that a pressure difference exists between the upstream surface and the downstream surface of the first filter membrane 32 during the filtration process, when the middle area is bent toward and approaches the end face of the support plate 31, the buffer area 342 of the first welding aid 34 which is permeable to the fluid is in direct contact with the downstream surface of the middle area of the first filter membrane 32, the frictional force between the two is more moderate, and the frictional force strength is small, so that the downstream surface of the middle area of the first filter membrane 32 is less damaged by friction, and the first filter membrane 32 is protected.

Preferably, this embodiment provides that the area of the buffer zone 342 of the first weldment 34 and the area of the first filter membrane 32 corresponding to the area surrounded by the annular seal 30 are both greater than the area of the area surrounded by the annular seal 30. The area relationship is set such that the buffer area 342 of the first welding aid 34 and the first filter membrane 32, which are sealed and fixed, slightly bulge outward in a direction away from the end face of the support plate 31, which is equivalent to slightly increasing the distance between the buffer area 342 of the first welding aid 34 and the end face of the first filter membrane 32 and the support plate 31 in the area surrounded by the annular sealing portion 30, so that, during the filtration process, when the first filter membrane 32 approaches the end face of the support plate 31 due to the pressure difference between the upstream surface and the downstream surface thereof, because the pressure difference needs to offset the distance that the buffer area 342 of the first filter membrane 32 and the first welding aid 34 bulge outward, the degree of close contact between the buffer area 342 of the first filter membrane 32 and the first welding aid 34 and the end face of the support plate 31 is further reduced, the first filter membrane 32 is protected, and the flow resistance is also reduced.

For example, the first welding aid 34 is a whole piece of polyester nonwoven fabric, and the annular region of the annular sealing portion 30 facing the support plate 31 constitutes the annular welding aid 341 thereof, and the inner region of the annular welding aid 341 constitutes the buffer zone 342.

In yet another embodiment, a filter element 3 is shown in fig. 13, which provides a filter element 3 that differs from the filter element 3 provided in fig. 12 in that a second weld aid 35 and a second filter membrane 33 are provided on the outside of the first filter membrane 32.

Similarly, in this embodiment, the first soldering aid 34 has an annular soldering aid 341 and a buffer 342 integrally formed inside the annular soldering aid 341, that is, the annular soldering aid 341 is no longer a notch structure but a solid part made of the same material as the annular soldering aid 341 and constituting the buffer 342.

The second soldering aid 35 also has an annular soldering aid area 351 and a buffer area 352 integrally formed inside the annular soldering aid area 351, i.e. the annular soldering aid area 351 is no longer provided with a notch structure, but is a solid part made of the same material as the annular soldering aid area 351, and the solid part constitutes the buffer area 352.

For example, the first welding aid 34 is a whole piece of polyester nonwoven fabric, and the annular region of the annular sealing portion 30 facing the support plate 31 constitutes the annular welding aid 341 thereof, and the inner region of the annular welding aid 341 constitutes the buffer zone 342. The second welding aid 35 is also a whole piece of polyester nonwoven fabric, and the annular region of the annular sealing portion 30 facing the support plate 31 constitutes an annular welding aid region 351 thereof, and the inner region of the annular welding aid region 351 constitutes a buffer region 352.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (10)

1. The utility model provides a filter assembly, includes inlet, liquid outlet, first end piece, second end piece and seals and pile up in a plurality of filter element between the two, filter element includes the backup pad and seals the first filter membrane of being fixed in its both ends face, the upstream side and the inlet intercommunication of first filter membrane, the backup pad has the filtrating escape way who all communicates with the downstream side and the liquid outlet of first filter membrane, the both ends face of backup pad all is equipped with cyclic annular sealing portion, its characterized in that: the first filter membrane comprises an upstream side pre-filter layer and a downstream side separation layer, the aperture of the separation layer is smaller than that of the pre-filter layer, the separation layer faces the end face of the support plate, the PMI average aperture of the first filter membrane is 10-100nm, a first welding aid is arranged between the end face of the support plate and the first filter membrane, the first welding aid is provided with an annular welding aid area corresponding to the annular sealing portion, and the outer edge of the first filter membrane is welded and fixed to the annular sealing portion through the annular welding aid area.

2. The filter assembly of claim 1, wherein the first weldment has an average pore size of no less than 1 μm.

3. The filter assembly of claim 2, wherein the first weldment is a polyester nonwoven having a thickness of 80 to 160 μm.

4. A filter assembly as claimed in claim 1, 2 or 3, wherein the annular seal has a width of 2-3 mm.

5. The filter assembly according to claim 4, wherein a plurality of flow guiding ribs and a plurality of flow guiding grooves are arranged in the area surrounded by the annular sealing portion at the two end surfaces of the support plate, the flow guiding ribs and the flow guiding grooves are spaced from each other, and the height difference between the end surface of the annular sealing portion and the end surface of the flow guiding ribs is 0.3-0.6 mm.

6. The filter assembly of claim 5, wherein the flow guiding ribs and the flow guiding grooves extend in parallel, the annular sealing portion includes a first boundary and a second boundary which are oppositely arranged, the extending direction of the first boundary and the second boundary is parallel to the extending direction of the flow guiding ribs and the flow guiding grooves, and the flow guiding ribs are directly connected with the inner walls of the first boundary and the inner walls of the second boundary.

7. The filter assembly of claim 1, wherein the first weld aid further comprises a buffer zone integrally formed inside the annular weld aid zone, the buffer zone corresponding to an area bounded by the annular seal portion at both end faces of the support plate to separate the first filter membrane from the end faces of the support plate.

8. The filter assembly of claim 7, wherein the area of the buffer zone of the first weldment and the area of the first filter membrane corresponding to the area surrounded by the annular seal are both greater than the area of the area surrounded by the annular seal.

9. The filter assembly of claim 1, further comprising a second weld aid positioned outside the first filter membrane and a second virus removal membrane, the second weld aid having an annular weld aid corresponding to the annular seal, the outer edge of the second virus removal membrane being sealingly connected to the outer edge of the first filter membrane by the annular weld aid of the second weld aid.

10. The filter assembly of claim 1, further comprising a second weld aid and a second virus removal membrane positioned outside the first filter membrane;

the annular sealing part comprises a first annular sealing part and a second annular sealing part positioned on the periphery of the first annular sealing part, and the second annular sealing part is higher than the first annular sealing part;

the outer edge of the first filter membrane and the annular soldering-assistant area of the first soldering-assistant piece are fixed to the first annular sealing portion through welding, and the outer edge of the second virus removing membrane and the annular soldering-assistant area of the second soldering-assistant piece are fixed to the second annular sealing portion through welding.

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