Virus removing filter membrane package with protection structure

Abstract

The utility model discloses a virus filter membrane package with protection structure, including the unit of passing through, liquid inlet unit and encapsulating part, the liquid inlet unit and the unit of passing through are arranged in the interval and are formed membrane package main part with the stack, the encapsulating part is sealed to the membrane package main part periphery, the liquid inlet unit and the unit of passing through all are equipped with corresponding liquid inlet and the mouth of passing through, the unit of passing through includes a screen and is arranged respectively in the virus filter membrane of the both sides of screen, the liquid inlet unit includes a liquid inlet screen, be equipped with the protection layer of the liquid -permeable between the liquid inlet screen and virus filter membrane, the protection layer corresponding mouth diameter and the liquid inlet screen mouth diameter ratio of passing through the mouth of passing through is 1.5 3. The utility model aims at avoiding the direct contact of liquid inlet screen and virus filter membrane, improves the protection effect to filter membrane.

Description

Technical Field

[0001] This utility model belongs to the field of filter technology, and in particular relates to a virus-removing filter membrane pack with a protective structure. Background Technology

[0002] A virus-removing filter membrane pack is a common filtration device. It is formed by stacking virus-removing filter membranes with an internal flow-guiding screen. Adjacent virus-removing filter membranes are arranged opposite each other, with the inlet or outlet surfaces of the membranes facing each other. An inlet channel is formed between adjacent inlet surfaces, and an outlet channel is formed between adjacent outlet surfaces. Material enters the inlet channel through the inlet of the virus-removing filter membrane pack, is vertically filtered by the membrane, enters the outlet channel, and is discharged through the outlet of the virus-removing filter membrane pack.

[0003] In conventional technical solutions, to prevent the virus-removing filter membrane from embedding into the filtrate guiding screen, an isolation layer is placed between the virus-removing filter membrane and the filtrate guiding screen. This isolation layer serves to separate the filter membrane and the filtrate guiding screen. Since both the upstream and downstream sides of the virus-removing filter membrane are made of the same screen material, the liquid flow will preferentially contact the virus-removing filter membrane before the isolation layer. Therefore, the direct impact force of the liquid flow will act on the virus-removing filter membrane. The relatively soft virus-removing filter membrane is at risk of deformation and damage under pressure. The isolation layer cannot fundamentally achieve the effect of protecting the filter membrane. Utility Model Content

[0004] This invention provides a virus-removing filter membrane package with a protective structure, which avoids direct contact between the liquid inlet screen and the virus-removing filter membrane, thereby improving the protection effect on the filter membrane.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A virus-removing filter membrane pack with a protective structure includes a permeation unit, a liquid inlet unit, and an adhesive coating. The liquid inlet unit and the permeation unit are stacked at intervals to form the membrane pack body. The adhesive coating seals the outer periphery of the membrane pack body. Each liquid inlet unit and the permeation unit has a corresponding liquid inlet and a permeation outlet. The permeation unit includes a permeation screen and virus-removing filter membranes respectively disposed on both sides of the permeation screen. The liquid inlet unit includes a liquid inlet screen. A liquid-permeable protective layer is provided between the liquid inlet screen and the virus-removing filter membrane. The ratio of the pore size of the protective layer at the permeation outlet to the pore size of the liquid inlet screen's permeation outlet is 1.5-3. The inlet and permeation units are stacked alternately, with a protective layer between them. The outermost layer of the permeation unit is the virus-removing membrane. The protective layer prevents direct contact between the inlet screen and the virus-removing membrane. When the feed liquid enters the inlet unit and flows to the virus-removing membrane for filtration, the protective layer receives the feed liquid before the membrane, buffering the impact force. The protective layer also acts as a pre-filter, increasing the loading capacity of the virus-removing membrane. Furthermore, during the compression process of the virus-removing membrane, the protective layer ensures even distribution of the force exerted by the inlet screen. Its flexible nature also prevents significant force on the downstream virus-removing membrane, effectively preventing damage. Typically, the inlet of the liquid inlet screen has a perforated sealing section. Sealing is achieved by compressing the perforated sealing section against the virus-removing filter membrane. In this application, because the protective layer is positioned between the liquid inlet screen and the virus-removing filter membrane, and the protective layer is often made of non-woven materials such as non-woven fabric, if the size of the perforation in the protective layer at the inlet is the same as the size of the inlet of the liquid inlet screen, the non-woven fabric and the virus-removing filter membrane are in direct contact and it is difficult to ensure a seal under compression. This leads to mixing of the filtrate and the inlet liquid, affecting the filtration effect. Therefore, this application sets a larger perforation in the protective layer corresponding to the inlet of the liquid inlet screen. This does not affect the direct seal between the sealing section at the inlet of the liquid inlet screen and the virus-removing filter membrane. When the ratio of the diameter of the perforation at the protective layer corresponding to the diameter of the inlet of the liquid inlet screen to the diameter of the inlet of the liquid inlet screen is less than 1.5, the protective layer overlaps with the normally placed perforated sealing section. This results in a partial protective layer between the perforated sealing section and the virus-removing filter membrane, with the remaining portion suspended and deformed after compression. This leads to a poorer sealing effect and uneven stress on the virus-removing filter membrane at the inlet, making it prone to damage. When the ratio of the aperture of the protective layer at the through-hole to the aperture of the liquid inlet screen is greater than 3, a large gap will exist between the outer edge of the pore encapsulation part and the through hole of the protective layer at the through-hole. This will affect the protective effect of the protective layer on the virus removal filter membrane. If the gap is made up by increasing the area of ​​the pore encapsulation part, the larger area of ​​the pore encapsulation part will seal and adhere to the virus removal filter membrane. This will not only reduce the filtration area of ​​the virus removal filter membrane, but also reduce the force between the pore encapsulation part and the virus removal filter membrane under the same holding force on the outside of the virus removal filter membrane, thus affecting the sealing performance.Therefore, the ratio of the aperture of the protective layer at the through-hole to the aperture of the liquid inlet screen needs to be controlled at 1.5-3 to balance the sealing effect and filtration efficiency at the through-hole of the liquid inlet screen.

[0007] Preferably, the protective layer is fixedly connected to the inlet screen or the virus-removing filter membrane. In this way, the protective layer and the inlet screen or the virus-removing filter membrane are fixedly connected to form a whole, resulting in better integrity of the membrane package and facilitating subsequent assembly to form a complete membrane package.

[0008] Preferably, the inlet screen has a connecting area and a pure rubber area protruding from the screen at the through-hole. The pure rubber area abuts and seals against the virus-removing filter membrane, and the outer diameter of the pure rubber area is no larger than the aperture of the through-hole on the protective layer. This allows the through-hole to be made of a softer silicone material, which is more flexible and therefore has a greater deformation capacity, thus contributing to a better sealing effect.

[0009] Preferably, the outer diameter of the pure adhesive area is adapted to the aperture of the protective layer through-hole, and the pure adhesive area and / or the connecting area are fixed and sealed to the protective layer by bonding.

[0010] Preferably, the outer side of the pure adhesive area has a protrusion extending beyond the surface of the protective layer, the protrusion covering at least a portion of the protective layer surface. The protrusion extends beyond the non-woven fabric, resulting in a better sealing effect with adjacent units and forming an integral unit with the liquid inlet screen, further improving the connection between the protective layer and the liquid inlet screen.

[0011] Preferably, the liquid inlet screen has a connecting area and a pure rubber area protruding from the screen formed by silicone bonding at the through-hole.

[0012] Preferably, the protective layer and the liquid inlet screen are fixed and sealed at the through-hole by means of outer ring hot-melt welding and inner ring bonding.

[0013] Preferably, a transition layer made of non-woven fabric is provided between the permeable screen and the virus-removing filter membrane. The transition layer, located on the side of the virus-removing filter membrane in contact with the permeable screen, provides better protection for the virus-removing filter membrane.

[0014] Preferably, the thickness of the protective layer is 80-300 μm; and / or, the basis weight of the protective layer (111) is 30-120 g / m². A protective layer of suitable thickness and / or basis weight can effectively ensure the filtration flux and filtration effect.

[0015] Preferably, the protective layer is made of hydrophilic nonwoven fabric. Hydrophilic nonwoven fabric is a porous material, which further increases the contact area between the protective layer and the inlet screen and the virus-removing filter membrane under stress, significantly reducing the pressure under the same force. Simultaneously, the porous structure of the protective layer allows for a large flow rate of filtrate without introducing additional filtration resistance, effectively ensuring filtration efficiency.

[0016] The beneficial effects of this utility model are: (1) The protective layer prevents the liquid inlet screen from directly contacting the virus removal filter membrane, and during the membrane packing and pressing process, the protective layer makes the force of the liquid inlet screen evenly distributed on the virus removal filter membrane, effectively preventing damage to the virus removal filter membrane and greatly improving the protection effect of the virus removal filter membrane; (2) The protective layer has a porous structure, which increases the flow rate of the filtrate and avoids additional filtration resistance, effectively ensuring filtration efficiency; (3) The aperture of the protective layer corresponding to the through-hole is larger than the aperture of the liquid inlet screen, which makes it easier to set a silicone material with lower hardness at the through-hole, directly abutting the silicone with the virus removal filter membrane to achieve a better sealing effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a structural diagram showing the arrangement of the liquid inlet unit and the permeation unit of this utility model;

[0019] Figure 3 This is an exploded view of the liquid inlet unit of this utility model;

[0020] Figure 4 This is a cross-sectional view of the liquid inlet unit at the through hole in Embodiment 1 of this utility model;

[0021] Figure 5 This is a cross-sectional view of the transmission unit of this utility model at the transmission hole;

[0022] Figure 6 This is a cross-sectional view of the liquid inlet unit at the through hole in Embodiment 2 of this utility model;

[0023] Figure 7 This is a cross-sectional view of the liquid inlet unit at the through hole in Embodiment 3 of this utility model.

[0024] In the figure: membrane body 1, liquid inlet unit 11, protective layer 111, liquid inlet screen 112, pure glue area 113, protrusion 113a, connecting area 114, welding area 115, permeation unit 12, virus removal filter membrane 121, transition layer 122, permeation screen 123, liquid inlet 101, reflux port 102, permeation port 103, and glue-coated component 2. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] like Figure 1 , Figure 2 In Embodiment 1 shown, a virus-removing filter membrane pack with a protective structure includes a permeation unit 12, a liquid inlet unit 11, and an adhesive coating 2. The liquid inlet unit 11 and the permeation unit 12 are stacked at intervals to form a membrane pack body 1. The adhesive coating 2 is disposed on the outer periphery of the membrane pack body 1 and seals the outer periphery of the membrane pack body 1 to obtain a complete virus-removing filter membrane pack. Both the liquid inlet unit 11 and the permeation unit 12 are provided with corresponding inlet 101, reflux port 102, and permeation port 103. The feed liquid flows in from the inlet 101, and the liquid that passes through the permeation unit 12 flows out from the permeation port 103. The virus-removing filter membrane pack acts as a dead-end filter. The reflux port 102 can also serve as the feed liquid inlet, or the reflux port 102 can be blocked during the filtration process and opened after filtration to allow the liquid that has not passed through the permeation unit 12 to flow out from the reflux port 102.

[0028] like Figure 3 As shown, the liquid inlet unit 11 includes a liquid inlet screen 112 and protective layers 111 respectively disposed on both sides of the liquid inlet screen 112. The protective layers 111 are made of soft porous composite materials. In this embodiment, the material of the protective layer 111 is hydrophilic nonwoven fabric. Special treatments are applied to substrates such as polyester (PET), polyolefins (PP, PE), etc., such as plasma treatment, hydrophilic agent impregnation, surface grafting modification, or blending spinning processes, to form polar groups or microgroove structures on the originally hydrophobic fiber surface, thereby significantly improving the wettability and capillary effect of the material. The protective layer 111 made of hydrophilic nonwoven fabric can not only quickly absorb and uniformly diffuse liquid, but also lock in moisture through the three-dimensional network structure between fibers, reducing backflow, while maintaining permeability and softness. Figure 4As shown, the protective layer 111 and the liquid inlet screen 112 are connected at the through-hole 103 to form an encapsulation. In this embodiment, the protective layer 111 and the liquid inlet screen 112 are fixed and sealed at the through-hole 103 by bonding. After the protective layer 111 and the liquid inlet screen 112 are permeated by silicone potting at the through-hole 103, a pure glue area 113 is formed. The pure glue area 113 seals the through-hole 103, thereby forming a seal. During the potting process, the silicone further permeates into the interior of the liquid inlet screen 112, forming a connection area 114 where the silicone and the liquid inlet screen 112 are bonded. Both the connection area 114 and the pure glue area 113 are adjacent to the protective layer 111, thereby connecting the liquid inlet screen 112 and the protective layer 111 at the through-hole 103. When non-woven fabric is used as the material of the protective layer 111, at least some of the silicone will also penetrate into the protective layer 111. The ratio of the aperture of the protective layer 111 at the through-hole 103 to the aperture of the liquid inlet screen 112 through-hole 103 is 1.5-3. The outer diameter of the pure silicone area 113 is matched with the aperture of the protective layer 111 through-hole 103. The through-hole 103 can be made of silicone material with lower hardness, which is softer and has a greater deformation when subjected to compression, which is conducive to achieving a better sealing effect.

[0029] The thickness of the protective layer 111 is 80-300µm. The thickness of the protective layer 111 affects the filtration flux. When the thickness of the nonwoven fabric is less than 80µm, the protective layer 111 is compressed too tightly, thus affecting the filtration flux. When the thickness of the protective layer 111 is greater than 300µm, the resulting filter media layer will be too thick, leading to excessive tangential flow and poor filtration effect. The basis weight of the protective layer 111 is 30-120 g / m². Within this basis weight range, the protective layer 111 can provide a certain degree of support and protection without compressing the space of the virus-removing filter membrane.

[0030] like Figure 5 As shown, the permeation unit 12 includes a permeation screen 123 and virus-removing filter membranes 121 respectively disposed on both sides of the permeation screen 123. A transition layer 122 is provided between the permeation screen 123 and the virus-removing filter membrane 121, and the transition layer 122 is made of non-woven fabric. During the membrane packing compression process and during the filtration process, the virus-removing filter membrane 121 is subjected to compression force and filtrate pressure applied from the upstream inlet end, respectively. The virus-removing filter membrane 121 will directly contact the warp and weft threads of the permeation screen 123. At the contact point, the virus-removing filter membrane 121 not only loses its filtration capacity, thus reducing the filtration area, but may also be severely deformed, leading to membrane pore deformation or even cracking and loss of filtration capacity, affecting the filtration result. Therefore, the transition layer 122 is provided to better protect the virus-removing filter membrane 121. The virus-removing filter membrane 121 can be any one of cellulose filter membranes, polyethersulfone filter membranes, polytetrafluoroethylene filter membranes, and polyvinylidene fluoride filter membranes.

[0031] like Figure 2 As shown, the liquid inlet unit 11 and the permeation unit 12 are stacked alternately, with the liquid inlet unit 11 located between the two permeation units 12. The outermost part of the permeation unit 12 is the virus removal filter membrane 121. Therefore, the presence of the protective layer 111 avoids direct contact between the liquid inlet screen 112 and the virus removal filter membrane 121. During the membrane packing process, the protective layer 111 allows the force of the liquid inlet screen 112 to be evenly distributed. The soft nature of the protective layer 111 itself determines that it will not exert a large force on the downstream virus removal filter membrane 121, and the virus removal filter membrane 121 will not be damaged. Since the protective layer 111 is a disordered multilayer porous material, its contact area with the liquid inlet screen 112 and the virus removal filter membrane 121 is large. For example, if the protective layer 111 is made of hydrophilic nonwoven fabric, due to its soft and deformable nature, when subjected to force, the pores on the surface will be filled by the material of other layers, and the pressure under the same force will be significantly reduced. In addition, due to the large porosity of the protective layer 111, the flow rate of the filtrate is large, which will not bring additional filtration resistance and can effectively ensure filtration efficiency.

[0032] Example 2

[0033] The difference between Example 2 and Example 1 is that, as Figure 6 As shown, the outer side of the pure adhesive area 113 has a protrusion 113a that protrudes from the surface of the protective layer 111, and the protrusion 113a covers at least a portion of the surface of the protective layer 111. During the compression process of the virus-free filter membrane package, the protrusion 113a is deformed under pressure, resulting in a better sealing effect between the liquid inlet unit 11 and the adjacent unit. Furthermore, the protrusion 113a covering at least a portion of the surface of the protective layer 111 further improves the connection reliability between the protective layer 111 and the liquid inlet screen 112, and enhances the overall integrity of the liquid inlet screen 112.

[0034] Example 3

[0035] The difference between Example 3 and Example 1 is that, as Figure 7 As shown, the protective layer 111 and the inlet screen 112 of the liquid inlet unit 11 are fixed and sealed at the through-hole 103 by means of outer ring hot melt welding and inner ring bonding. The protective layer 111 and the inlet screen 112 are first connected together by welding in the through-hole area to form a welding area 115. Then, silicone potting is performed in the inner ring area of ​​the through-hole 103 to form a pure glue area 113. This can effectively control the position and size of the pure glue area 113 and limit the overflow of silicone in the inlet screen 112 during potting, thereby effectively ensuring the flow area of ​​the inlet screen 112.

[0036] Example 4

[0037] The difference between Example 4 and Example 1 is that, after the inlet screen 112 is permeated with silicone through the through-hole 103, a pure adhesive area 113 is formed. The pure adhesive area 113 seals the through-hole 103, thereby forming a seal. During the permeation, the silicone further penetrates into the interior of the inlet screen 112, forming a connection area 114 where the silicone and the inlet screen 112 are combined. After the adhesive cures, protective layers 111 are placed on both sides of the inlet screen 112. At this time, the protective layers 111 and the inlet screen 112 are only stacked, but not fixedly connected.

[0038] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A virus-removing filter membrane pack with a protective structure, comprising a permeation unit (12), a liquid inlet unit (11), and an encapsulating component, wherein the liquid inlet unit (11) and the permeation unit (12) are stacked at intervals to form a membrane pack body (1), the encapsulating component seals the outer periphery of the membrane pack body (1), and both the liquid inlet unit (11) and the permeation unit (12) are provided with corresponding liquid inlets (101) and permeation outlets (103), characterized in that, The permeation unit (12) includes a permeation screen (123) and virus-removing filter membranes (121) respectively disposed on both sides of the permeation screen (123). The liquid inlet unit (11) includes a liquid inlet screen (112). A liquid-permeable protective layer (111) is provided between the liquid inlet screen (112) and the virus-removing filter membrane (121). The ratio of the aperture of the protective layer (111) at the permeation port (103) to the aperture of the permeation port (103) of the liquid inlet screen (112) is 1.5-3.

2. The virus-removing filter membrane pack with a protective structure according to claim 1, characterized in that, The protective layer (111) is fixedly connected to the liquid inlet screen (112) or the virus removal filter membrane (121).

3. A virus-removing filter membrane pack with a protective structure according to claim 1 or 2, characterized in that, The liquid inlet screen (112) forms a connecting area (114) and a pure glue area (113) protruding from the screen at the through-hole (103). The pure glue area (113) is in contact with and sealed to the virus removal filter membrane. The outer diameter of the pure glue area (113) is not greater than the aperture of the through-hole (103) on the protective layer (111).

4. The virus-removing filter membrane pack with a protective structure according to claim 3, characterized in that, The outer diameter of the pure adhesive area (113) is adapted to the aperture of the through-hole (103) of the protective layer (111), and the pure adhesive area (113) and / or the connecting area (114) are fixed and sealed to the protective layer (111) by bonding.

5. The virus-removing filter membrane pack with a protective structure according to claim 4, characterized in that, The outer side of the pure rubber area (113) is provided with a protrusion (113a) protruding from the surface of the protective layer (111), and the protrusion (113a) covers at least part of the surface of the protective layer (111).

6. The virus-removing filter membrane pack with a protective structure according to claim 3, characterized in that, The liquid inlet screen (112) forms a connecting area (114) and a pure rubber area (113) protruding from the screen by silicone bonding at the through-hole (103).

7. The virus-removing filter membrane pack with a protective structure according to claim 6, characterized in that, The protective layer (111) and the liquid inlet screen (112) are fixed and sealed at the through-hole (103) by means of outer ring hot-melt welding and inner ring bonding.

8. The virus-removing filter membrane pack with a protective structure according to claim 1, characterized in that, A transition layer (122) is provided between the permeable screen (123) and the virus-removing filter membrane (121), the transition layer (122) being made of non-woven fabric.

9. The virus-removing filter membrane pack with a protective structure according to claim 1, characterized in that, The thickness of the protective layer (111) is 80-300 μm; And / or, the protective layer (111) has a basis weight of 30-120 g / m².

10. The virus-removing filter membrane pack with a protective structure according to claim 1, characterized in that, The protective layer (111) is made of hydrophilic nonwoven fabric.

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