Film bag

Abstract

The membrane bag provided by the utility model comprises a liquid inlet screen and a filtrate unit, the filtrate unit comprises a filtrate screen and a filter layer, the filtrate screen is provided with a packaging hole, and the filter layer is provided with a through hole opposite to the packaging hole; the filtrate unit further comprises a peripheral packaging part, a hole packaging part and a filtering area surrounded by the peripheral packaging part; the peripheral packaging part is adhered to the periphery of the filtrate screen, extends along the thickness direction of the membrane bag and is connected to the filtrate surface of the filter layer; the hole packaging part is welded to the periphery of the packaging hole in the filtrate screen, extends in the thickness direction of the membrane bag and is welded or elastically connected to the periphery of the through hole of the filter layer; at least a part of the outer edge of the hole packaging part is overlapped with or directly attached to a part of the inner edge of the peripheral packaging part to form an overlapped section, and the packaging structure has the advantages of being good in sealing effect and high in preparation yield.

Description

Technical Field

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

[0002] Membrane packages are often used to separate or concentrate solid-liquid or solid-gas mixed phase products in experiments or industrial production. In the field of biomedicine, membrane packages are a commonly used form of filtration components, which usually include alternately stacked liquid inlet screens and filtrate units. Among them, the filtrate unit usually includes a filtrate screen and a filter layer. The filter layer mainly plays a filtering effect, and the filtrate screen is mainly used to guide the filtrate formed after filtering through the filter layer.

[0003] The existing filtrate screen usually has a packaging hole, and the filter layer usually has a through hole arranged opposite to the packaging hole. In order to prevent the original liquid and the filtrate in the membrane package from mixing with each other and affecting the filtration effect, the existing filtrate screen is usually provided with a peripheral packaging part and a hole packaging part, so that the filtration area enclosed by it can be separated from the flow channel of the original liquid in the membrane package. At the same time, the periphery of the through hole of the filter layer can be sealed in the process of stacking the filtrate screen and the filter layer to form a filtrate unit.

[0004] In the manufacturing process of the existing filtrate screen, the filter layer, the filtrate screen and the processing material (such as thermoplastic plastic) distributed in an integral manner are usually stacked, and the processing material is heated to melt and penetrate into the mesh structure of the filtrate screen, and then cooled and solidified on the filtrate screen to form a peripheral packaging part and a hole packaging part.

[0005] However, when the peripheral packaging part and the hole packaging part of the filtrate unit are processed in this way, on the one hand, it is necessary to heat the processing material distributed in an integrated manner as a whole synchronously, which is difficult to process and easily leads to uneven heating of the processing material locally, thereby affecting the connection effect of the formed peripheral packaging part and the hole packaging part with the filtrate screen and the filter layer, and affecting the sealing effect of the membrane package; on the other hand, since the processing material must be melted and then solidified during processing, a certain traction force (such as the force generated by the flow or the shrinkage force generated by the solidification of the glue liquid, etc.) is likely to be generated between the various regions of the processing material during this process, which is likely to cause the peripheral packaging part and the hole packaging part to warp, especially the hole packaging part, the area connected to the peripheral packaging part is subject to the traction force of the peripheral packaging part, which is likely to cause its overall force to be uneven, thereby causing the side away from the peripheral packaging part to warp, and even affecting the yield rate of the membrane package. Moreover, during the filtration process of the membrane package, the position of the warping is likely to produce filtrate residue, affecting the filtration efficiency and filtration effect. In addition, since the direction of the shrinkage force during the solidification of the processing material is uncertain, there is a certain probability that the processing material will cause the filtrate screen and the filter layer to exert forces in different directions, which may easily cause wrinkles on the filtrate screen, affect the filtration effect, and even affect the yield rate of the membrane package.

[0006] Therefore, it is urgent for those skilled in the art to provide a membrane package with excellent sealing effect and high yield rate. Summary of the invention

[0007] The technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a membrane package.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A membrane package comprises a liquid inlet screen and a filtrate unit which are alternately stacked, the filtrate unit comprising a filtrate screen and a filter layer, the filtrate screen having a packaging hole, and the filter layer having a through hole arranged opposite to the packaging hole; the filtrate unit further comprises a peripheral packaging portion, a hole packaging portion and a filter area surrounded by the peripheral packaging portion; the peripheral packaging portion is bonded to the periphery of the filtrate screen, extends along the thickness direction of the membrane package and is connected to the periphery of the filtrate surface of the filter layer to seal the fluid around the filtrate unit; the hole packaging portion is welded to the periphery of the packaging hole on the filtrate screen, extends along the thickness direction of the membrane package and is welded or elastically connected to the periphery of the through hole of the filter layer to seal the fluid around the packaging hole; at least a portion of the outer edge of the hole packaging portion overlaps or is oppositely fitted with a portion of the inner edge of the peripheral packaging portion to form an overlapping section.

[0010] Through the above technical solution, the peripheral packaging part is bonded to the periphery of the filtrate screen, and extends along the thickness direction of the membrane package and is connected to the periphery of the filtrate surface of the filter layer, so that a stable sealing connection can be formed between the peripheral packaging part and the filtrate screen and the filter layer at the same time, thereby increasing the sealing effect of the filtrate unit. At the same time, since the peripheral packaging part is distributed along the periphery of the filtrate screen and has a relatively regular structure, during its melting and solidification process, it can simultaneously exert a uniform force on the periphery of the filtrate screen and the filter layer, thereby avoiding wrinkles in the filtrate screen and the filter layer, thereby increasing the yield rate of the filtrate unit, increasing the yield rate of the membrane package, and making the formed filtrate unit and the membrane package formed by the filtrate unit have better filtration efficiency. Furthermore, the present solution also welds the hole packaging part to the periphery of the packaging hole on the filtrate screen, and welds or elastically connects to the periphery of the through hole of the filter layer along the thickness direction of the membrane package. On the one hand, the hole packaging part is smaller in size than the filtrate screen and the filter layer, and has less impact on the filtrate screen and the filter layer during processing. The welding method is used to reduce the processing difficulty to improve the processing yield. On the other hand, the hole packaging part is welded or elastically connected to the periphery of the through hole of the filter layer, which can have a good sealing effect on the periphery of the through hole of the filter layer.

[0011] In addition, when at least part of the outer edge of the hole packaging part partially overlaps or fits directly with the inner edge of the peripheral packaging part, a stable sealing connection can be formed between the hole packaging part and the peripheral packaging part, thereby avoiding the generation of filtrate residue between the two and affecting the filtration efficiency; and because the hole packaging part has a smaller connection area with the filtrate screen and the filtration layer than the peripheral packaging part, when at least part of the outer edge of the hole packaging part partially overlaps or fits directly with the inner edge of the peripheral packaging part, the peripheral edge sealing packaging part can generate a certain support, thereby avoiding to a certain extent the hole packaging part from being separated from the filtrate screen and the filtration layer when subjected to the impact force of the fluid. The "facing and fitting" referred to here means that there is a gap of less than 1 mm between the outer edge of the hole packaging part and the inner edge of the peripheral packaging part.

[0012] Preferably, the packaging holes at least include first packaging holes located at any number of inner corners of the filtrate unit, and the angle occupied by the overlapping sections around the first packaging holes around the first packaging holes is 90-240°.

[0013] Through the above technical scheme, the angle area occupied by the overlapping section around the first packaging hole is reasonably set, so that the hole packaging part and the surrounding packaging part have a stable connection effect. At the same time, it can avoid the overlapping section being too long to affect the effective area of ​​the filtration area, thereby affecting the filtration efficiency of the membrane package.

[0014] Preferably, the packaging hole further comprises a second packaging hole located between the two first packaging holes on any side, and the angle occupied by the overlapping section around the second packaging hole around the second packaging hole is 30-180°.

[0015] Through the above technical solution, when the membrane package area is large, by setting the second packaging hole between two adjacent first packaging holes, the flow space of the fluid can be effectively increased, thereby further increasing the filtration efficiency, and by reasonably setting the angle value occupied by the overlapping section around the first packaging hole, the hole packaging part and the surrounding packaging part can have a stable connection effect, and at the same time, it can avoid the overlapping section being too long to affect the effective area of ​​the filtration area, thereby affecting the filtration efficiency of the membrane package. In addition, the overlapping section around the first packaging hole accounts for a larger proportion than the overlapping section around the second packaging hole, which can avoid the generation of filtrate residue at the inner corner position of the filtrate unit, further improving the filtration efficiency of the membrane package.

[0016] In the above solution, the angle occupied by the overlapping section around the first packaging hole and the second packaging hole usually refers to the angle formed by two rays drawn from the center point of the first packaging hole or the second packaging hole to the two ends of the connecting section.

[0017] Preferably, the overlapping segment is a continuous curved segment.

[0018] Through the above technical solution, the overlapping section is set as a curved section. On the one hand, the force applied to the hole packaging part by the overlapping section of the peripheral packaging part can be directed toward the center of the packaging hole, thereby achieving a better supporting effect. On the other hand, the processing difficulty of the peripheral packaging part and the hole packaging part can be reduced.

[0019] Preferably, the hardness of the peripheral encapsulation portion is greater than the hardness of the hole encapsulation portion.

[0020] Through the above technical solution, the hole encapsulation part has a relatively low hardness compared to the peripheral encapsulation part, and thus it is easier to press against the periphery of the through hole on the filter layer. The peripheral encapsulation part has a relatively low hardness, and can provide a good support effect on the filter layer during the stacking and extrusion of the membrane package, so as to avoid the small spacing between the filter layer and the filtrate screen affecting the filtration efficiency of the membrane package. At the same time, the peripheral encapsulation part has a high hardness, which can avoid a large height difference between the filtrate screen and the filter layer during the stacking and extrusion of the membrane package, thereby avoiding damage to the filter layer due to the large height difference.

[0021] Preferably, the difference between the thickness of the hole packaging part and the thickness of the filter area is D1, and the value range of D1 is 0.05-0.3 mm; and / or the difference between the thickness of the hole packaging part and the thickness of the peripheral packaging part is D2, and the value range of D2 is 0.01-0.2 mm.

[0022] Through the above technical solution, the difference between the thickness of the hole packaging part and the thickness of the filter area is reasonably set, and the gap between the filtrate screen and the filter layer is too small to affect the filtration efficiency of the membrane package. At the same time, it can also avoid the gap between the filtrate screen and the filter layer being too large to cause filtrate retention, and it can also avoid the gap between the filtrate screen and the filter layer being too large to cause a large thrust to drive the fluid flow, thereby affecting the filtration efficiency, and it can also avoid the excessive fluid impact force causing the filter layer to wrinkle or shift, affecting the filtration efficiency and filtration effect. At the same time, the reasonable setting of the thickness of the hole packaging part and the peripheral packaging part can not only ensure the supporting effect of the peripheral packaging part on the filter layer, so that the filtrate in the membrane package has enough flow space to ensure the filtration efficiency of the membrane package, but also avoid the hole packaging part and the peripheral packaging part squeezing the filter layer, causing the filter layer to have a large height difference and damage.

[0023] Preferably, the filtrate screen has a first edge and a second edge relative to each other, and a third edge and a fourth edge connected between the first edge and the second edge, the packaging holes are arranged on the first edge and the second edge, and the width of the peripheral packaging portion at the third edge and the fourth edge is not greater than 5 mm.

[0024] Through the above technical scheme, by reasonably setting the width of the peripheral packaging part on the third edge and the fourth edge, it is possible to ensure its effective support for the filter layer. At the same time, it can also avoid the peripheral packaging part width being too large to affect the effective filter area of ​​the filter zone, avoid the peripheral packaging part width being too small to affect the sealing effect, and avoid the peripheral packaging part width being too small to cause a large gap between the filter layer facing the peripheral packaging part area and the area deviating from the peripheral packaging part, thereby causing damage or wrinkles.

[0025] Preferably, the filtrate screen has a first edge and a second edge relative to each other, and a third edge and a fourth edge connected between the first edge and the second edge, the packaging holes are arranged on the first edge and the second edge, and the ratio of the minimum distance between the outer edge of the hole packaging part and the first edge or the second edge to the diameter of the packaging hole is in the range of 0.05 to 1:1.

[0026] Through the above technical scheme, by reasonably setting the ratio between the edge distance of the hole packaging part of the packaging hole to the first edge or the second edge and the diameter of the packaging hole, on the one hand, the connection area between the hole packaging part and the filtrate screen and the filter layer can be appropriately increased, thereby reducing the damage to the filter layer caused by the stacking and extrusion of the membrane package (such as breakage, wrinkle deformation, etc.); on the other hand, the area between the hole packaging part and the first edge, and the hole packaging part and the second edge can be provided for the peripheral packaging part to infiltrate to form an overlapping section, and the reasonable setting of its width can increase the stability of the connection between the peripheral packaging part and the hole packaging part, so that the peripheral packaging part can form an effective support for the hole packaging part, and at the same time, avoid damage to the effective filtration area of ​​the filtration zone and avoid the formation of flow dead angles between the hole packaging part and the peripheral packaging part.

[0027] Preferably, the edge of the filter layer is flush with the edge of the filtrate screen.

[0028] Through the above technical scheme, the filter layer is flush with the edge of the filtrate screen, which is beneficial to the alignment and stacking of the filter layer and the filtrate screen, so as to increase the stability of the connection between the filter layer and the filtrate screen; at the same time, it can also reduce the unevenness of the entire membrane package during the preparation of the membrane package and improve the flatness of the entire membrane package.

[0029] Preferably, the hole encapsulation portion and the encapsulation hole are concentric circles, or the hole encapsulation portion is an annular structure surrounding the encapsulation hole.

[0030] Through the above technical solution, when the hole packaging part is set to a concentric circle structure with the packaging hole, or when the hole packaging part is set to a ring structure, the force on the hole packaging part is directed toward the center of the packaging hole, so that the impact force of the filtrate and the force of the surrounding packaging parts are more uniform, which is more conducive to increasing the stability of its connection with the filtrate screen and the filter layer.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] 1. Through the above technical solution, the peripheral packaging part is bonded to the periphery of the filtrate screen, and extends along the thickness direction of the membrane package and is connected to the periphery of the filtrate surface of the filter layer, so that a stable sealing connection can be formed between the peripheral packaging part and the filtrate screen and the filter layer at the same time, thereby increasing the sealing effect of the filtrate unit. At the same time, since the peripheral packaging part is distributed along the periphery of the filtrate screen and has a relatively regular structure, during its melting and solidification process, it can simultaneously exert a uniform force on the periphery of the filtrate screen and the filter layer, thereby avoiding wrinkles in the filtrate screen and the filter layer, thereby increasing the yield rate of the filtrate unit, increasing the yield rate of the membrane package, and making the formed filtrate unit and the membrane package formed by the filtrate unit have better filtration efficiency. Furthermore, the present solution also welds the hole packaging part to the periphery of the packaging hole on the filtrate screen, and welds or elastically connects to the periphery of the through hole of the filter layer along the thickness direction of the membrane package. On the one hand, the hole packaging part is smaller in size than the filtrate screen and the filter layer, and has less impact on the filtrate screen and the filter layer during processing. The welding method is used to reduce the processing difficulty to improve the processing yield. On the other hand, the hole packaging part is welded or elastically connected to the periphery of the through hole of the filter layer, which can have a good sealing effect on the periphery of the through hole of the filter layer.

[0033] In addition, when at least part of the outer edge of the hole packaging part partially overlaps or fits directly with the inner edge of the peripheral packaging part, a stable sealing connection can be formed between the hole packaging part and the peripheral packaging part, thereby avoiding the generation of filtrate residue between the two and affecting the filtration efficiency; and because the hole packaging part has a smaller connection area with the filtrate screen and the filtration layer than the peripheral packaging part, when at least part of the outer edge of the hole packaging part partially overlaps or fits directly with the inner edge of the peripheral packaging part, the peripheral edge sealing packaging part can provide a certain support to the packaging part, thereby avoiding to a certain extent the hole packaging part from being separated from the filtrate screen and the filtration layer when subjected to the impact force of the fluid. The "facing and fitting" referred to here means that there is a gap of less than 1 mm between the inner edge of the hole packaging part 24 and the inner edge of the peripheral packaging part 23.

[0034] 2. Through the above technical solution, when the membrane package area is large, by setting the second packaging hole between two adjacent first packaging holes, the flow space of the fluid can be effectively increased, thereby further increasing the filtration efficiency. By reasonably setting the ratio of the overlapping section around the first packaging hole to the perimeter of the outer edge of the hole packaging part, and the ratio of the overlapping section around the second packaging hole to the perimeter of the outer edge of the hole packaging part, the hole packaging part and the surrounding packaging part can have a stable connection effect. At the same time, it can avoid the overlapping section being too long to affect the effective area of ​​the filtration area, thereby affecting the filtration efficiency of the membrane package. In addition, the overlapping section around the first packaging hole accounts for a larger proportion than the overlapping section around the second packaging hole, which can avoid the generation of filtrate residue at the inner corner position of the filtrate unit, further improving the filtration efficiency of the membrane package.

[0035] 3. By reasonably setting the ratio between the edge distance of the hole packaging part of the packaging hole to the first edge or the second edge and the diameter of the packaging hole, on the one hand, the connection area between the hole packaging part and the filtrate screen and the filter layer can be appropriately increased, thereby reducing the damage to the filter layer caused by the stacking and extrusion of the membrane package (such as breakage, wrinkle deformation, etc.); on the other hand, the area between the hole packaging part and the first edge and the hole packaging part and the second edge can be provided for the peripheral packaging part to infiltrate to form an overlapping section. The reasonable setting of its width can increase the stability of the connection between the peripheral packaging part and the hole packaging part, so that the peripheral packaging part can form an effective support for the hole packaging part. At the same time, the effective filtration area of ​​the filtration zone is avoided from being damaged, and the formation of flow dead angles between the hole packaging part and the peripheral packaging part is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0037] Figure 1 This is a structural schematic diagram of the first embodiment provided by the utility model (membrane package explosion schematic diagram).

[0038] Figure 2 for Figure 1 Schematic diagram of the structure of the filtrate screen.

[0039] Figure 3 for Figure 2 Schematic diagram of the cut along section AA.

[0040] Figure 4 This is a structural schematic diagram of the second embodiment provided by the utility model (membrane package explosion schematic diagram).

[0041] Figure 5 for Figure 4 Schematic diagram of the structure of the middle filtrate screen;

[0042] Figure 6 It is a schematic diagram when a non-circular hole packaging part is selected in Example 1 and Example 2.

[0043] Description of reference numerals:

[0044] 1. Liquid inlet screen; 2. Filtrate unit; 21. Filtrate screen; 211. First edge; 212. Second edge; 213. Third edge; 214. Fourth edge; 22. Filter layer; 23. Peripheral packaging part; 24. Hole packaging part; 25. Filter area; 3. Packaging hole; 31. First packaging hole; 32. Second packaging hole; 4. Through hole; 5. Overlap section. DETAILED DESCRIPTION

[0045] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Embodiment 1

[0049] See also Figures 1 to 3The embodiment of the utility model provides a membrane package, comprising an inlet screen 1 and a filtrate unit 2 alternately stacked, wherein the filtrate unit 2 comprises a filtrate screen 21 and a filter layer 22. The inlet screen 1 is mainly used to guide the stock liquid into the membrane package and quickly and evenly spread the filter layer 22, the filter layer 22 is mainly used to filter the stock liquid to form a filtrate, and the filtrate screen 21 is mainly used to quickly guide the filtrate out to increase the filtration efficiency of the membrane package.

[0050] Specifically, in order to avoid the mutual circulation of the original liquid and the filter in the membrane package, in this embodiment, the filtrate screen 21 has a packaging hole 3, and the filter layer 22 has a through hole 4 arranged opposite to the packaging hole 3. It can be known that the membrane package has a liquid inlet hole and a filtrate hole, and in order to ensure the filtration efficiency of the membrane package, the diameter of the liquid inlet hole of the membrane package is larger than the diameter of the filtrate hole, the liquid inlet screen 1, the filtrate screen 21, and the liquid inlet holes on the filter layer 22 are arranged opposite to each other, and the liquid inlet screen 1, the filtrate screen 21, and the filtrate holes on the filter layer 22 are arranged opposite to each other. This setting is consistent with the membrane package in the prior art, and has little relevance to the improvement of this application, so it is not repeated. In this embodiment, only the "packaging hole 3 on the filtrate screen 21" (liquid inlet hole on the filtrate screen 21) and the "through hole 4 on the filter layer 22 arranged opposite to the packaging hole 3" (liquid inlet hole of the filter layer 22) mentioned above are further explained.

[0051] Furthermore, the filtrate unit 2 also includes a peripheral packaging portion 23, a hole packaging portion 24, and a filtration area 25 surrounded by the peripheral packaging portion 23. Among them, the peripheral packaging portion 23 is bonded to the periphery of the filtrate screen 21, and extends along the thickness direction of the membrane package and is connected to the periphery of the filtrate surface of the filter layer 22, so that a stable sealing connection can be formed between the peripheral packaging portion 23 and the filtrate screen 21 and the filter layer 22 at the same time, thereby increasing the sealing effect of the filtrate unit 2 and preventing the filtrate from leaking from the edges of the filtrate screen 21 and the filter layer 22. Specifically, the bonding of the peripheral packaging portion 23 can be achieved by applying a bonding material such as a thermoplastic resin, a thermosetting resin (such as polyurethane, epoxy resin, etc.) to a specific area and then curing it. At the same time, since the peripheral packaging part 23 is distributed along the periphery of the filtrate screen 21 and has a relatively regular structure, during its melting and solidification process, it can simultaneously exert a uniform force on the periphery of the filtrate screen 21 and the filter layer 22, thereby avoiding the formation of wrinkles on the filtrate screen 21 and the filter layer 22, thereby increasing the yield rate of the filtrate unit 2, increasing the yield rate of the membrane package, and making the formed filtrate unit 2 and the membrane package formed by the filtrate unit 2 have better filtration efficiency.

[0052] Furthermore, the hole packaging portion 24 is welded to the periphery of the packaging hole 3 on the filtrate screen 21, and extends along the thickness direction of the membrane package and is welded or elastically connected to the periphery of the through hole 4 of the filter layer 22 to seal the fluid around the packaging hole 3. On the one hand, the hole packaging portion 24 is smaller in size than the filtrate screen 21 and the filter layer 22, and has less impact on the filtrate screen 21 and the filter layer 22 during processing. The use of welding can reduce its processing difficulty to improve the processing yield; on the other hand, the hole packaging portion 24 is welded or elastically connected to the periphery of the through hole 4 of the filter layer 22, which can have a good sealing effect on the periphery of the through hole 4 of the filter layer 22.

[0053] Furthermore, a portion of the outer edge of the hole packaging portion 24 overlaps with a portion of the inner edge of the peripheral packaging portion 23 to form an overlapping section 5, so that a stable sealing connection is formed between the hole packaging portion 24 and the peripheral packaging portion 23, thereby avoiding the generation of filtrate residue between the two and affecting the filtration efficiency; and because the hole packaging portion 24 has a smaller connection area with the filtrate screen 21 and the filter layer 22 than the peripheral packaging portion 23, when the outer edge of the hole packaging portion 24 overlaps with the inner edge of the peripheral packaging portion 23, the peripheral edge sealing packaging portion can provide a certain support to the packaging portion, thereby avoiding, to a certain extent, the hole packaging portion 24 from being separated from the filtrate screen 21 and the filter layer 22 when subjected to fluid impact force. In the actual processing, in order to improve the yield rate, the inner edge of the hole packaging part 24 and the inner edge of the peripheral packaging part 23 are aligned to meet the actual use requirements. It should be noted that the "aligned" referred to here means that there is a gap of less than 1mm between the inner edge of the hole packaging part 24 and the inner edge of the peripheral packaging part 23, which is usually caused by the different shrinkage rates of the two packaging materials during the curing process or insufficient processing accuracy. Of course, in other embodiments, the outer edges of the hole packaging part 24 can also be aligned to the inner edges of the peripheral packaging part 23, that is, the peripheral packaging part 23 is arranged around the hole packaging part 24.

[0054] See also Figure 2 In order to ensure that the hole packaging part 24 has a stable connection effect with the peripheral packaging part 23, and at the same time, not affecting the filtration efficiency of the membrane package, in this embodiment, the filtrate unit 2 (filtrate screen 21) is rectangular and has four inner angles, and the packaging hole 3 includes a first packaging hole 31 located at two inner angles of the filtrate unit 2 (filtrate screen 21), and the angle α of the first packaging hole occupied by the overlapping section 5 around the first packaging hole 31 can be 90 to 240°. It is worth noting that the filtrate unit 2 (filtrate screen 21) is not limited to a rectangular shape, and the specific structure can be set according to the actual product.

[0055] Furthermore, the overlapping section 5 is a continuous curved section. On the one hand, it can enable the force applied by the peripheral packaging part 23 to the hole packaging part 24 through the overlapping section 5 to be directed toward the center of the packaging hole 3, thereby achieving a better supporting effect. On the other hand, it can reduce the processing difficulty of the peripheral packaging part 23 and the hole packaging part 24.

[0056] See also Figure 1 and Figure 3 In this embodiment, the hardness of the peripheral packaging part 23 is greater than the hardness of the hole packaging part 24. Specifically, in this embodiment, the peripheral packaging part is made of polyurethane with a hardness of about 75-80D, while the hole packaging part is made of polyolefin with a hardness of about 60D. Compared with the peripheral packaging part 23, the hole packaging part 24 has a relatively small hardness, and is easier to press against the periphery of the through hole 4 on the filter layer 22. The hardness of the peripheral packaging part 23 is relatively small, and can provide a good support effect on the filter layer 22 during the stacking and extrusion of the membrane package, so as to avoid the small spacing between the filter layer 22 and the filtrate screen 21 affecting the filtration efficiency of the membrane package. At the same time, the peripheral packaging part 23 has a large hardness, which can avoid a large height difference between the filtrate screen 21 and the filter layer 22 during the stacking and extrusion of the membrane package, and thus avoid the filter layer 22 from being damaged due to the large height difference.

[0057] Further, on the filtrate screen 21, the difference between the thickness H1 of the hole packaging portion 24 and the thickness H2 of the filtration area 25 is D1, and D1 can be set to 0.05mm, 0.2mm or 0.3mm. Of course, the value range of D1 is 0.05-0.3mm. By reasonably setting the value of D1, on the one hand, it can be avoided that the gap between the filtrate screen 21 and the filter layer 22 is too small to affect the filtration efficiency of the membrane package; it can also be avoided that the gap between the filtrate screen 21 and the filter layer 22 is too large to cause filtrate retention, and further it can be avoided that the gap between the filtrate screen 21 and the filter layer 22 is too large, resulting in a large thrust to drive the fluid flow, thereby affecting the filtration efficiency, and it can also be avoided that the fluid impact force is too large to cause the filter layer 22 to wrinkle, deform or shift, affecting the filtration efficiency and filtration effect. The thickness can be measured by a commonly used thickness gauge, such as a laser thickness gauge or a mechanical thickness gauge. Since the screen itself has a certain rigidity, a small amount of pressure is applied to the non-packaging area of ​​the screen during the thickness measurement to make the screen flatter as a whole, which will not affect the measurement accuracy.

[0058] Furthermore, on the filtrate screen 21, the difference between the thickness H1 of the hole packaging part 24 and the thickness H3 of the peripheral packaging part 23 is D2, and D2 can be set to 0.05mm, 0.2mm or 0.3mm. Of course, the value range of D2 is 0.01-0.2mm. By reasonably setting the value range of D2, it is possible to ensure the supporting effect of the peripheral packaging part 23 on the filter layer 22, so that the filtrate in the membrane package has sufficient flow space to ensure the filtration efficiency of the membrane package, and avoid the hole packaging part 24 and the peripheral packaging part 23 squeezing the filter layer 22, resulting in a large height difference and damage to the filter layer 22.

[0059] It is worth noting that in Figure 3 In the figure, H1, H2 and H3 are shown to be the same only for the convenience of drawing. In fact, under the action of pressure, the filter layer 22 will be squeezed on the surface of the filtrate screen 21 to form an uneven structure.

[0060] See also Figure 1 and Figure 2 The filtrate screen 21 has a first edge 211 and a second edge 212 opposite to each other, and a third edge 213 and a fourth edge 214 connected between the first edge 211 and the second edge 212 , and the packaging holes 3 are arranged on the first edge 211 and the second edge 212 .

[0061] Furthermore, the width W1 of the peripheral packaging portion 23 at the third edge 213 and the fourth edge 214 is not greater than 5 mm, thereby ensuring that the peripheral packaging portion 23 effectively supports the filter layer 22. At the same time, it can also prevent the peripheral packaging portion 23 from being too wide and affecting the effective filter area of ​​the filter zone 25, and from being too small and affecting the sealing effect, and from being too small and causing a large gap between the filter layer 22 facing the peripheral packaging portion 23 and the area deviating from the peripheral packaging portion 23, thereby causing damage or wrinkles.

[0062] Further, for the packaging holes 3 arranged along the first edge 211, the ratio of the distance S1 (herein referred to as the minimum distance) between the outer edge of the hole packaging part 24 and the first edge 211 to the diameter of the packaging hole 3 is in the range of 0.05 to 1:1. On the one hand, the connection area between the hole packaging part 24 and the filtrate screen 21 and the filter layer 22 can be appropriately increased, thereby reducing the damage to the filter layer 22 caused by the stacking and extrusion of the membrane package (such as breakage, wrinkle deformation, etc.); on the other hand, the area between the hole packaging part 24 and the first edge 211, and the hole packaging part 24 and the second edge 212 can be used for the peripheral packaging part 23 to penetrate to form an overlapping section 5. The reasonable setting of its width can increase the stability of the connection between the peripheral packaging part 23 and the hole packaging part 24, so that the peripheral packaging part 23 can form an effective support for the hole packaging part 24, and at the same time, avoid the effective filtration area of ​​the filtration area 25 from being damaged, and avoid the generation of flow dead angles between the hole packaging part 24 and the peripheral packaging part 23. Similarly, for the packaging holes 3 arranged along the second edge 212 , the ratio of the distance S2 between the outer edge of the hole packaging portion 24 and the second edge 212 to the diameter of the packaging hole 3 is in the range of 0.05 to 1:1.

[0063] See also Figure 1 The edge of the filter layer 22 is flush with the edge of the filtrate screen 21, which is conducive to the alignment and stacking of the filter layer 22 and the filtrate screen 21, so as to increase the stability of the connection between the filter layer 22 and the filtrate screen 21; at the same time, it can also reduce the unevenness of the entire membrane package during the preparation of the membrane package and improve the flatness of the entire membrane package.

[0064] See also Figure 2 The hole encapsulation part 24 is concentric with the encapsulation hole 3, so that the force on the hole encapsulation part 24 is toward the center of the encapsulation hole 3, so that the impact force of the filtrate and the force of the surrounding encapsulation part 23 are more uniform, which is more conducive to increasing the stability of its connection with the filtrate screen 21 and the filter layer 22. Of course, in other embodiments, the hole encapsulation part 24 is an annular structure surrounding the encapsulation hole 3.

[0065] In addition, it is worth noting that the “thickness” involved in this embodiment can be calculated by measuring the thickness at multiple locations using a thickness gauge and taking the average.

[0066] Embodiment 2

[0067] See also Figure 4 and Figure 5Based on the above-mentioned first embodiment, the difference of this embodiment is that: the membrane package is still distributed in a rectangular shape, the overall volume is increased, and the packaging holes 3 include first packaging holes 31 located at the four inner corners of the filtrate unit 2 (filtrate screen 21), and second packaging holes 32 located between two first packaging holes 31 on any side of the filtrate unit 2 (filtrate screen 21). When the overall volume of the membrane package is larger, the flow space of the fluid can be effectively increased by arranging the second packaging holes 32 between two adjacent first packaging holes 31, thereby further increasing the filtration efficiency.

[0068] Furthermore, the angle β of the overlap section 5 around the second packaging hole 32 can be arbitrarily set to 30-180°, which can ensure that the hole packaging part 24 and the surrounding packaging part 23 have a stable connection effect. At the same time, it can avoid that the overlap section 5 is too long to affect the effective area of ​​the filtration area 25, thereby affecting the filtration efficiency of the membrane package. In addition, the overlap section 5 around the first packaging hole 31 accounts for a larger proportion than the overlap section 5 around the second packaging hole 32, which can avoid the generation of filtrate residue at the inner corner position of the filtrate unit 2, and further improve the filtration efficiency of the membrane package.

[0069] It should be noted that, for the first and second embodiments, a circular hole encapsulation portion is used in the drawings of the present embodiments. In fact, Figure 6 The special-shaped holes shown, such as wedge-shaped, triangular, etc., can also meet the requirements of the above embodiments.

[0070] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A membrane package, comprising a liquid inlet screen and a filtrate unit alternately stacked, wherein the filtrate unit comprises a filtrate screen and a filter layer, the filtrate screen has a packaging hole, and the filter layer has a through hole arranged opposite to the packaging hole; It is characterized in that The filtrate unit further comprises a peripheral encapsulation portion, a hole encapsulation portion and a filtration area surrounded by the peripheral encapsulation portion; The peripheral packaging portion is bonded to the periphery of the filtrate screen, extends along the thickness direction of the membrane package and is connected to the periphery of the filtrate surface of the filtration layer to seal the fluid around the filtrate unit; The hole encapsulation part is welded to the periphery of the encapsulation hole on the filtrate screen, and extends along the thickness direction of the membrane package and is welded or elastically connected to the periphery of the through hole of the filtration layer to seal the fluid around the encapsulation hole; At least a portion of the outer edge of the hole packaging portion overlaps or is directly aligned with a portion of the inner edge of the peripheral packaging portion to form an overlapping section.

2. A membrane package according to claim 1, characterized in that: The packaging holes at least include first packaging holes located at any number of inner corners of the filtrate unit, and the angle occupied by the overlapping sections around the first packaging holes around the first packaging holes is 90-240°.

3. A membrane package according to claim 2, characterized in that: The packaging hole further includes a second packaging hole located between the two first packaging holes on any side, and the length of the overlapping section around the second packaging hole occupies an angle of 30 to 180 degrees around the second packaging hole.

4. The membrane package according to any one of claims 2 or 3, characterized in that: The overlapping segment is a continuous curve segment.

5. A membrane package according to claim 1, characterized in that: The hardness of the peripheral encapsulation portion is greater than the hardness of the hole encapsulation portion.

6. A membrane package according to claim 1, characterized in that: The difference between the thickness of the hole encapsulation portion and the thickness of the filter area is D1, and the value range of D1 is 0.05-0.3 mm; and / or, The difference between the thickness of the hole packaging part and the thickness of the peripheral packaging part is D2, and the value range of D2 is 0.01-0.2 mm.

7. A membrane package according to claim 1, characterized in that: The filtrate screen has a first edge and a second edge opposite to each other, and a third edge and a fourth edge connected between the first edge and the second edge. The packaging holes are arranged on the first edge and the second edge, and the width of the peripheral packaging part at the third edge and the fourth edge is not greater than 5 mm.

8. A membrane package according to claim 1, characterized in that: The filtrate screen has a first edge and a second edge opposite to each other, and a third edge and a fourth edge connected between the first edge and the second edge. The packaging holes are arranged on the first edge and the second edge. The ratio of the minimum distance between the outer edge of the hole packaging part and the first edge or the second edge to the diameter of the packaging hole is in the range of 0.05 to 1:

1.

9. A membrane package according to claim 1, characterized in that: The edge of the filter layer is flush with the edge of the filtrate screen.

10. A membrane package according to claim 1, characterized in that: The hole encapsulation portion and the encapsulation hole are concentric circles, or the hole encapsulation portion is an annular structure surrounding the encapsulation hole.

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