Filter assembly

Abstract

The utility model provides a filtering assembly. The filtering assembly comprises a filtering part and a shell, the filtering part comprises a liquid inlet screen, a filtering membrane and a filtrate screen which are sequentially and alternately stacked, and packaging holes and through holes are formed in the liquid inlet screen and the filtrate screen; packaging parts are arranged on the liquid inlet screen and the filtrate screen; the packaging part located on the liquid inlet screen comprises a first peripheral packaging part arranged on the periphery of the liquid inlet screen, and the first peripheral packaging part is formed by welding a welding piece to the liquid inlet screen and is elastically connected and sealed with a filtering membrane; the packaging part located on the filtrate screen comprises a second peripheral packaging part arranged on the periphery of the filtrate screen, and the second peripheral packaging part is bonded and sealed with the filter membrane; the projection of the first peripheral packaging part on the plane where the liquid inlet screen is located and the projection of the second peripheral packaging part on the plane where the liquid inlet screen is located at least partially coincide to form a coincidence area, and the filter element has the advantages of being high in sealing performance and filtering efficiency.

Description

Technical Field

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

[0002] In experiments or industrial production, filter components are often used to separate or concentrate solid-liquid or solid-gas mixed phase products. In the field of biomedicine, membrane packages are a commonly used form of filter components, which usually include a filter part and a shell packaged outside the filter part, wherein the filter part includes a liquid inlet screen, a filtrate screen and a filter membrane, which mainly plays a filtering role, and the shell packaged outside the filter part mainly plays a sealing role.

[0003] When manufacturing the filter assembly, it is usually formed by alternately stacking a liquid inlet screen, a filter membrane and a filtrate screen and sealing them with glue on the periphery. In order to achieve the mutual circulation of the original liquid and the filtrate in the filter part, a packaging part is usually set on the liquid inlet screen and the filtrate screen. The existing packaging part is usually fixed to the liquid inlet screen and the filtrate screen by welding, and an elastic connection seal is formed between the packaging part formed by welding and the filter membrane.

[0004] Since the surface of the filter membrane is smooth and it is located between the liquid inlet screen and the filtrate screen, when the packaging part welded on the liquid inlet screen and the filtrate screen is elastically abutted against the filter membrane, it is easy to cause the filter membrane to move during the stacking process, especially when the liquid inlet screen, filter membrane and filtrate screen of the filter part are stacked in multiple layers. When the filter membrane is shifted in position, the central axis of the holes (including packaging holes and through holes) on the filter membrane will also be shifted relative to the central axis of the holes (including packaging holes and through holes) on the liquid inlet screen and the filtrate screen. On the one hand, it is easy to cause the periphery of the filter membrane and the periphery of the holes on the filter membrane (including packaging holes and through holes) to be difficult to be elastically sealed by the packaging part, thereby affecting the sealing effect of the filter part and the filtering effect of the feed liquid. On the other hand, it is easy to cause the original effective filtering area of ​​the filter membrane to be covered by the packaging part, thereby affecting the effective filtering area of ​​the filter membrane and the filtering efficiency of the filter part.

[0005] Another solution is that the packaging part uses an adhesive method, such as thermosetting resin pressure-sensitive adhesive, to achieve the bonding of the liquid inlet screen, filtrate screen and filter membrane. Compared with the above-mentioned solution using elastic connection of welded parts, this solution has better connection strength, and the filter membrane and screen are not easy to shift during the packaging process. However, due to the poor fluidity of the glue during the packaging process, the packaging effect of the screen is poor, and the internal flatness is low, which easily causes residual filter residue.

[0006] Therefore, it is urgent for those skilled in the art to provide a filter assembly with excellent sealing effect and high filtering efficiency. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a filter assembly. To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A filter assembly, comprising a filter part and a shell wrapped around the outer periphery of the filter part; the filter part comprises a liquid inlet screen, a filter membrane and a filtrate screen which are alternately stacked in sequence, and the liquid inlet screen and the filtrate screen are both provided with packaging holes and through holes; the liquid inlet screen and the filtrate screen are both provided with packaging parts for blocking the mutual circulation of raw liquid and filtrate in the filter part; the packaging part located on the liquid inlet screen comprises a first peripheral packaging part arranged around the liquid inlet screen, the first peripheral packaging part is formed by welding to the liquid inlet screen through a welding sheet, and is elastically connected and sealed with the filter membrane; the packaging part located on the filtrate screen comprises a second peripheral packaging part arranged around the filtrate screen, the second peripheral packaging part is bonded and sealed with the filter membrane, and the projection of the first peripheral packaging part on the plane where the liquid inlet screen is located and the projection of the second peripheral packaging part on the plane where the liquid inlet screen is located at least partially overlap to form an overlapping area.

[0009] Through the above technical solution, the first peripheral packaging part is welded to the liquid inlet screen through the welding sheet, and is elastically connected and sealed with the filter membrane. On the one hand, the first peripheral packaging part can form a stable support for the flow channel between the liquid inlet screen and the filter membrane, so that the raw liquid can quickly cover the liquid inlet end face of the filter membrane, increasing the filtration efficiency of the filter assembly. On the other hand, the elastic extrusion force formed by the elastic extrusion seal can achieve effective sealing between the liquid inlet end face periphery of the filter membrane and the liquid inlet screen, avoiding the mixing of the raw liquid and the filtrate in the filter part, and ensuring the filtration effect. In addition, in this solution, the elastic extrusion structure is connected to the liquid inlet screen by welding. On the one hand, hot pressure welding will not directly affect the screen, and on the other hand, it can form a smoother surface structure, so it has better sealing performance and connection performance as a whole.

[0010] Further, the second peripheral encapsulation part and the filter membrane are sealed by bonding, so that a stable (fixed) connection is formed between the second peripheral encapsulation part and the filter membrane, thereby avoiding the filter membrane from being offset during stacking and filtering. Bonding can be achieved by thermosetting resins, such as polyurethane, epoxy resin, etc., and can also be achieved by using pressure-sensitive adhesives such as EVA. On the one hand, by bonding to form a seal, the filtrate screen and the filter membrane can have good sealing and connection stability, avoiding the hidden dangers of poor sealing between the filter membrane and the filtrate screen or the filter membrane being scoured by fluid during the filtration process and shifting the sealing effect, thereby ensuring the filtering effect of the feed liquid, on the other hand, the filtrate screen is bonded and sealed with the filter membrane, when the filter part is processed, the filtrate screen and the filter membrane can be bonded first and then stacked with the liquid inlet screen, which is conducive to aligning the holes on the filtrate screen, the filter membrane and the liquid inlet screen in the process of stacking, and can avoid the original effective filtering area of ​​the filter membrane from being covered by the encapsulation part while ensuring the sealing effect, thereby affecting the effective filtering area of ​​the filter membrane, thereby affecting the filtering efficiency of the filter part. At the same time, the preparation process by bonding is relatively gentle, it will not affect the structure of the screen, and under the limiting effect of the filter membrane, the flow of the adhesive is more controllable, and a stable, well-supported and flat supporting surface can be formed around the filtrate screen.

[0011] In addition, the projection of the first peripheral packaging part on the plane where the liquid inlet screen is located and the projection of the second peripheral packaging part on the plane where the liquid inlet screen is located at least partially overlap to form an overlapping area, that is, when the liquid inlet screen, the filter membrane and the filtrate screen are stacked, the first peripheral packaging part and the second peripheral packaging part are at least partially able to press against each other. On the one hand, the stably adhered second peripheral packaging part applies a certain extrusion force to the first peripheral packaging part formed by welding the welding sheet, which can make the elastic connection and sealing effect between the first peripheral packaging part and the filter membrane better. On the other hand, the first peripheral packaging part and the second peripheral packaging part can at least partially press against and press the periphery of the filter membrane, which can further avoid the displacement of the filter membrane during the stacking and filtration process, thereby ensuring the sealing effect and effective filtration area of ​​the filter membrane.

[0012] Preferably, the overlapping area is arranged in a closed ring shape, and the maximum distance between the inner edge of the projection area of ​​the first peripheral packaging part on the plane where the filter membrane is located and the inner edge of the projection area of ​​the second peripheral packaging part on the plane where the filter membrane is located is d, and d is not greater than 5 times the thickness of either the liquid inlet screen or the filtrate screen.

[0013] Through the above technical scheme, the overlapping area is set to a closed annular structure, so that the first peripheral packaging part and the second peripheral packaging part can press the filter membrane along the periphery of the filter membrane to form a stable clamp for the filter membrane. On the one hand, it can increase the sealing effect around the filter membrane, the liquid inlet screen, and the filtrate screen to avoid mixing of the original liquid and the filtrate in the filter part, thereby ensuring the filtering effect of the filter part. On the other hand, it can make the force around the filter membrane more uniform, avoid the filter membrane from being offset or wrinkled during the stacking process or the filtration process, and avoid the retention of original liquid and filtrate, which affects the filtration efficiency. In addition, when the thickness of the liquid inlet screen and the filtrate screen is greater, the overall supporting performance of the first peripheral packaging part is better. At this time, the processing accuracy of the first peripheral packaging part and the second peripheral packaging part can be reduced to a certain extent, thereby reducing the processing difficulty. According to the thickness of the liquid inlet screen and the filtrate screen, this scheme sets the maximum distance d between the inner edge of the projection area of ​​the first peripheral packaging part on the plane where the filter membrane is located and the inner edge of the projection area of ​​the second peripheral packaging part on the plane where the filter membrane is located within a reasonable range, which can not only ensure the tightening effect of the first peripheral packaging part and the second peripheral packaging part on the filter membrane, but also reduce the processing accuracy of the first peripheral packaging part and the second peripheral packaging part accordingly, thereby reducing the processing difficulty of both.

[0014] It should be noted that the thickness of each component measured in this application refers to the thickness of each component after the membrane package is disassembled and is not subject to external forces, rather than the thickness of each component in the actual working state in the membrane package.

[0015] Preferably, the projection of the second peripheral packaging portion on the plane where the liquid inlet screen is located completely covers the inner edge of the projection of the first peripheral packaging portion on the plane where the liquid inlet screen is located.

[0016] Through the above technical solution, the projection of the second peripheral packaging part on the plane where the liquid inlet screen is located completely covers the inner edge of the first peripheral packaging part, which is more conducive to the first peripheral packaging part and the second peripheral packaging part to press against each other, which is conducive to improving the sealing of the filtration area in the filter part and the flatness of the area where the filter membrane is elastically squeezed. In addition, the second peripheral packaging part can completely cover the inner edge of the first peripheral packaging part, so that the raw liquid on the liquid inlet screen can quickly cover the filtrate screen after passing through the filter membrane, avoiding the effective filtration area on the filtrate screen from being covered, and further increasing the filtration efficiency.

[0017] Preferably, the value range of d is d≤2 mm.

[0018] Through the above technical scheme, the value range of d is reasonably set, which can ensure the compression effect of the first peripheral packaging part and the second peripheral packaging part on the filter membrane to increase the sealing of the filter part and the flatness of the filter membrane, while reducing the processing accuracy of the first peripheral packaging part and the second peripheral packaging part, thereby reducing the processing difficulty.

[0019] Preferably, at least the liquid inlet screen and / or the filtrate screen protrudes from the filter membrane to form a glue seepage area around the filter part; the glue seepage area is used to fill the glue when the shell is formed, and form a connection portion between at least a partial outer edge of the first peripheral packaging part and / or the second peripheral packaging part and the inner wall of the shell.

[0020] Through the above technical scheme, a glue seepage area is formed around the filter part, so that the shell can be filled with glue during the molding process, and then the first peripheral packaging part and / or the second peripheral packaging part can form a stable connection with the inner wall of the shell. On the one hand, it can be sealed from the periphery of the filter part to increase the sealing between the filter membrane, the liquid inlet screen and the filtrate screen to ensure the sealing effect of the filter part. On the other hand, the formation of the connecting part can achieve a stable connection between the first peripheral packaging part and / or the second peripheral packaging part, and then increase the compression effect of the first peripheral packaging part and / or the second peripheral packaging part on the filter membrane to ensure the flatness of the filter membrane. At the same time, the side wall surface of the filter membrane itself also forms a stable connection with the connecting part, so that the force around the filter membrane is more uniform, further ensuring the flatness of the filter membrane and avoiding the filter membrane from being offset or wrinkled during the filtration process to affect its filtration efficiency.

[0021] Preferably, the outer edge of the liquid inlet screen protrudes from the outside of the first peripheral packaging portion.

[0022] Through the above technical scheme, the glue seepage area is formed between two adjacent liquid inlet screens, so that the formed connection part can tighten the first peripheral packaging part located on the two adjacent liquid inlet screens in a direction perpendicular to the filter membrane. On the one hand, the tension applied by the connection part can act on the periphery of the filter membrane, uniformly apply force and press the periphery of the filter membrane, which is conducive to maintaining the flatness of the filter membrane, avoiding displacement or wrinkling of the filter membrane and affecting the filtering efficiency of the filter part. On the other hand, the elastic connection and sealing effect between the first peripheral packaging part and the filter membrane can be better, ensuring the filtering effect of the filter part. Of course, it is worth mentioning that the edge of the filtrate screen can protrude from the first peripheral packaging part, further increasing the flatness and sealing effect of the liquid inlet screen, the filtrate screen and the filter membrane. The edge of the filtrate screen may not protrude from the first peripheral packaging part, and the connection part formed directly in the glue seepage area between the two adjacent liquid inlet screens can also ensure the flatness and sealing effect of the liquid inlet screen, the filtrate screen and the filter membrane.

[0023] Preferably, along the thickness direction of the filter part, the outermost layer of the filter part is arranged as a liquid inlet screen.

[0024] Through the above technical solution, the outermost part is set as the liquid inlet screen, which expands the total volume of the liquid inlet flow channel. Since the liquid inlet flow rate is always greater than the filtrate flow rate, when the total volume of the liquid inlet screen increases, the total fluid flux in the filter part is increased, thereby increasing the filtration efficiency. At the same time, since multiple filter parts are usually stacked for use, the outermost part of the filter part is set as the liquid inlet screen, so that when the filter parts are stacked for filtration, even if a single filter part leaks, it will not affect other filter parts, and it can avoid the mixing of filtrate caused by poor sealing of the shell or even the lack of the shell, thereby increasing the overall sealing.

[0025] Preferably, the thickness of the second peripheral packaging portion protruding from the end surface of the filtrate screen is in the range of 0.01 to 2 mm.

[0026] Through the above technical solution, the thickness of the second peripheral packaging part protruding from the end surface of the filtrate screen is reasonably set, so that the width of the filtrate flow channel can be increased to facilitate the discharge of the filtrate without excessively increasing the thickness of the filter assembly. In addition, the part of the second peripheral packaging part protruding from the filtrate screen can also push the filter membrane to press against the first peripheral packaging part during the process of squeezing and installing the filter assembly, thereby increasing the sealing effect between the first peripheral packaging part and the filter membrane.

[0027] Preferably, the packaging part also includes a first hole packaging part and a second hole packaging part; the first hole packaging part is formed by welding a welding sheet to the periphery of the packaging hole located on the liquid inlet screen; the second hole packaging part is formed by welding a welding sheet to the periphery of the packaging hole located on the filtrate screen, or is formed by solidifying or curing the glue to the periphery of the packaging hole located on the filtrate screen.

[0028] Through the above technical solution, the first hole packaging part is welded to the periphery of the packaging hole of the liquid inlet screen by welding, and the second hole packaging part is fixed to the periphery of the packaging hole of the filtrate screen by welding sheets or solidifying glue, which can increase the sealing of the packaging holes of the liquid inlet screen and the filtrate screen, thereby increasing the sealing effect of the entire filter part.

[0029] Preferably, the hardness of the first peripheral packaging portion is less than the hardness of the second peripheral packaging portion;

[0030] The hardness of the second peripheral packaging portion ranges from 40 to 85D;

[0031] The ratio of the hardness of the first peripheral packaging portion to the hardness of the second peripheral packaging portion is in the range of 0.5 to 0.9:1.

[0032] Through the above technical scheme, the hardness of the second peripheral packaging part is reasonably set, so that the second peripheral packaging part itself has better sealing performance; and the hardness of the first peripheral packaging part is less than that of the second peripheral packaging part, and the hardness of the second peripheral packaging part and the hardness of the first peripheral packaging part are within a certain proportional range. On the one hand, the second peripheral packaging part can better press the first peripheral packaging part to increase the sealing effect of the first peripheral packaging part. On the other hand, the second peripheral packaging part can better push the filter membrane against the first peripheral packaging part, further increasing the sealing effect of the first peripheral packaging part and the filter membrane.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. Through the above technical scheme, the first peripheral packaging part is welded to the liquid inlet screen through the welding sheet, and is elastically connected and sealed with the filter membrane. On the one hand, the first peripheral packaging part can form a stable support for the flow channel between the liquid inlet screen and the filter membrane, so that the raw liquid can quickly cover the liquid inlet end face of the filter membrane, thereby increasing the filtration efficiency of the filter assembly. On the other hand, the elastic extrusion force formed by the elastic extrusion seal can achieve effective sealing between the periphery of the liquid inlet end face of the filter membrane and the liquid inlet screen, avoiding mixing of the raw liquid and the filtrate in the filter part, thereby ensuring the filtration effect. Furthermore, the second peripheral packaging part and the filter membrane are sealed by bonding, so that a stable (fixed) connection is formed between the second peripheral packaging part and the filter membrane, thereby avoiding the displacement of the filter membrane during the stacking and filtration process. On the one hand, the sealing formed by bonding can ensure that the filtrate screen and the filter membrane have good sealing and connection stability, thereby avoiding the hidden danger of poor sealing effect due to poor sealing between the filter membrane and the filtrate screen or displacement of the filter membrane due to fluid scouring during the filtration process, thereby ensuring the filtration effect of the feed liquid. On the other hand, the filtrate screen is bonded and sealed to the filter membrane. When the filter part is processed, the filtrate screen and the filter membrane can be bonded first and then stacked with the liquid inlet screen, which is conducive to aligning the holes on the filtrate screen, the filter membrane and the liquid inlet screen during the stacking process. While ensuring the sealing effect, it can avoid the original effective filtration area of ​​the filter membrane being covered by the packaging part, thereby affecting the effective filtration area of ​​the filter membrane, and then affecting the filtration efficiency of the filter part. In addition, the projection of the first peripheral packaging part on the plane where the liquid inlet screen is located and the projection of the second peripheral packaging part on the plane where the liquid inlet screen is located at least partially overlap to form an overlapping area, that is, when the liquid inlet screen, the filter membrane and the filtrate screen are stacked, the first peripheral packaging part and the second peripheral packaging part are at least partially able to press against each other. On the one hand, the stably adhered second peripheral packaging part applies a certain extrusion force to the first peripheral packaging part formed by welding the welding sheet, which can make the elastic connection and sealing effect between the first peripheral packaging part and the filter membrane better. On the other hand, the first peripheral packaging part and the second peripheral packaging part can at least partially press against and press the periphery of the filter membrane, which can further avoid the displacement of the filter membrane during the stacking and filtration process, thereby ensuring the sealing effect and effective filtration area of ​​the filter membrane.

[0035] 2. Through the above technical scheme, the overlapping area is set to a closed annular structure, so that the first peripheral packaging part and the second peripheral packaging part can press the filter membrane along the periphery of the filter membrane to form a stable clamping of the filter membrane. On the one hand, it can increase the sealing effect around the filter membrane, the liquid inlet screen, and the filtrate screen to avoid mixing of the original liquid and the filtrate in the filter part, thereby ensuring the filtering effect of the filter part. On the other hand, it can make the force around the filter membrane more uniform, avoid the filter membrane from being offset or wrinkled during the stacking process or the filtration process, and avoid the retention of original liquid and filtrate, which affects the filtration efficiency. In addition, it can be known that when the thickness of the liquid inlet screen and the filtrate screen is greater, the overall supporting performance of the first peripheral packaging part is better. At this time, the processing accuracy of the first peripheral packaging part and the second peripheral packaging part can be reduced to a certain extent, thereby reducing the processing difficulty. According to the thickness of the liquid inlet screen and the filtrate screen, this scheme sets the maximum distance d between the inner edge of the projection area of ​​the first peripheral packaging part on the plane where the filter membrane is located and the inner edge of the projection area of ​​the second peripheral packaging part on the plane where the filter membrane is located within a reasonable range, which can not only ensure the tightening effect of the first peripheral packaging part and the second peripheral packaging part on the filter membrane, but also reduce the processing accuracy of the first peripheral packaging part and the second peripheral packaging part accordingly, thereby reducing the processing difficulty of both.

[0036] 3. Through the above technical scheme, a glue seepage area is formed around the filter part, so that the shell can be filled with glue during the molding process, and then the first peripheral packaging part and / or the second peripheral packaging part can form a stable connection with the inner wall of the shell. On the one hand, it can be sealed from the periphery of the filter part to increase the sealing between the filter membrane, the liquid inlet screen and the filtrate screen to ensure the sealing effect of the filter part. On the other hand, the formation of the connecting part can achieve a stable connection between the first peripheral packaging part and / or the second peripheral packaging part, thereby increasing the compression effect of the first peripheral packaging part and / or the second peripheral packaging part on the filter membrane, ensuring the flatness of the filter membrane. At the same time, the side wall surface of the filter membrane itself also forms a stable connection with the connecting part, so that the force around the filter membrane is more uniform, further ensuring the flatness of the filter membrane, and avoiding the filter membrane from being offset or wrinkled during the filtration process to affect its filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] Figure 1 It is a schematic diagram of the first embodiment of the present utility model.

[0039] Figure 2 for Figure 1 A magnified schematic diagram of position A in the middle.

[0040] Figure 3 for Figure 1 Schematic cross-section diagram.

[0041] Figure 4 for Figure 3 A magnified schematic diagram of position B in the middle.

[0042] Figure 5 It is a schematic diagram of the second embodiment of the present utility model.

[0043] Figure 6 for Figure 5 Enlarged schematic diagram of the C position in the middle.

[0044] Figure 7 This is a schematic diagram of Embodiment 3 of the present utility model.

[0045] Figure 8 for Figure 7 The schematic diagram has a schematic diagram of the structure after the connection part is formed.

[0046] Fig. 9 It is a schematic diagram of the fourth embodiment of the present utility model.

[0047] Fig.10 for Fig. 9 The schematic diagram has a schematic diagram of the structure after the connection part is formed.

[0048] Fig.11 This is a schematic diagram of Embodiment 5 of the present utility model.

[0049] Fig.12 for Fig.11 The schematic diagram has a schematic diagram of the structure after the connection part is formed.

[0050] Description of reference numerals:

[0051] 1. Filter part; 11. Liquid inlet screen; 12. Filter membrane; 13. Filtrate screen; 2. Shell; 3. Packaging hole; 4. Through hole; 5. Packaging part; 51. First peripheral packaging part; 52. Second peripheral packaging part; 53. First hole packaging part; 54. Second hole packaging part; 6. Overlapping area; 7. Glue seepage area; 8. Connecting part. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Embodiment 1

[0056] See also Figures 1 to 4 , the embodiment of the utility model provides a filter assembly, including a filter part 1 and a shell 2 wrapped around the outer periphery of the filter part 1; the filter part 1 includes a liquid inlet screen 11, a filter membrane 12 and a filtrate screen 13 which are alternately stacked in sequence, and the liquid inlet screen 11 and the filtrate screen 13 are both provided with packaging holes 3 and through holes 4; the liquid inlet screen 11 and the filtrate screen 13 are both provided with a packaging part 5, which is used to block the mutual circulation of the original liquid and the filtrate in the filter part 1. It is worth noting that in the figure of the present embodiment, the packaging holes 3 and the through holes 4 of the filter part 1 are both set to two, and are distributed on the two opposite sides of the filter part 1, and the packaging holes 3 and the through holes 4 on both sides are staggered, but the number and position of the packaging holes 3 and the through holes 4 are not limited to this form. In other embodiments, a plurality of packaging holes 3 and through holes 4 can be set, and the packaging holes 3 and through holes located on the two opposite sides of the filter part 1 can also be symmetrically distributed, which can be set according to actual needs.

[0057] Specifically, in this embodiment, the packaging portion 5 located on the liquid inlet screen 11 includes a first peripheral packaging portion 51 arranged around the liquid inlet screen 11, and the first peripheral packaging portion 51 is welded to the liquid inlet screen 11 by welding sheets, and is elastically connected and sealed with the filter membrane 12; on the one hand, the first peripheral packaging portion 51 can form a stable support for the flow channel between the liquid inlet screen 11 and the filter membrane 12, so that the raw liquid can quickly cover the liquid inlet end face of the filter membrane 12, thereby increasing the filtration efficiency of the filter assembly; on the other hand, the elastic extrusion force formed by the elastic extrusion seal can achieve effective sealing between the liquid inlet end face of the filter membrane 12 and the liquid inlet screen 11, thereby avoiding mixing of the raw liquid and the filtrate in the filter portion 1, thereby ensuring the filtration effect.

[0058] Furthermore, the packaging portion 5 located on the filtrate screen 13 includes a second peripheral packaging portion 52 arranged around the filtrate screen 13, and the second peripheral packaging portion 52 is bonded and sealed to the filter membrane 12, so that a stable (fixed) connection is formed between the second peripheral packaging portion 52 and the filter membrane 12, thereby preventing the filter membrane 12 from shifting during the stacking and filtration process. On the one hand, the sealing formed by bonding can ensure that the filtrate screen 13 and the filter membrane 12 have good sealing and connection stability, thereby preventing the filter portion 1 from being damaged due to poor sealing between the filter membrane 12 and the filtrate screen 13 or the filter membrane 12 being damaged during the filtration process. The hidden danger of displacement due to fluid erosion leading to poor sealing effect is eliminated, thereby ensuring the filtering effect of the feed liquid. On the other hand, the filtrate screen 13 is bonded and sealed with the filter membrane 12. When the filter part 1 is processed, the filtrate screen 13 and the filter membrane 12 can be bonded first and then stacked with the liquid inlet screen 11. This is beneficial for aligning the holes on the filtrate screen 13, the filter membrane 12 and the liquid inlet screen 11 during the stacking process. While ensuring the sealing effect, it can avoid the original effective filtering area of ​​the filter membrane 12 being covered by the packaging part 5 and affecting the effective filtering area of ​​the filter membrane 12, thereby avoiding affecting the filtering efficiency of the filter part 1.

[0059] In this embodiment, along the thickness direction of the filter part 1, the outermost layer of the filter part 1 is set to be a liquid inlet screen 11, so that the liquid inlet screen 11, the filter membrane 12 and the filtrate screen 13 have better sealing when they are stacked. In addition, the liquid inlet screen 11 can also increase the liquid inlet area, and the increase in the liquid inlet area can make the liquid fill the liquid inlet surface of the filter membrane 12 more quickly, thereby increasing the filtration efficiency.

[0060] Furthermore, the first peripheral packaging part 51 protrudes from the end face of the liquid inlet screen 11, so that the first peripheral packaging part 51 can form an elastic connection seal with the filter membrane 12. In order to increase the width of the filtrate flow channel (i.e., the area between the filter surface of the filter membrane 12 and the filtrate screen 13) for facilitating the discharge of the filtrate without excessively increasing the overall thickness of the filter assembly, the second peripheral packaging part 52 in this embodiment also protrudes from the end face of the filtrate screen 13. The thickness H of the second peripheral packaging part 52 protruding from the end face of the filtrate screen 13 can be set to 0.01mm, 0.5mm, 1mm or 2mm. By reasonably setting the value of H, the width of the filtrate flow channel can be ensured to facilitate the discharge of the filtrate, while avoiding the increase in the overall thickness of the filter part 1 due to its excessive thickness, thereby avoiding unnecessary transportation costs and use costs. Of course, when the value range of H is 0.01mm to 2mm, the above effect can be achieved. In addition, the portion of the second peripheral packaging portion 52 protruding from the filtrate screen 13 can also push the filter membrane 12 against the first peripheral packaging portion 51 during the extrusion installation of the filter assembly, thereby increasing the sealing effect between the first peripheral packaging portion 51 and the filter membrane 12 .

[0061] In order to increase the sealing effect of the packaging holes 3 on the liquid inlet screen 11 and the filtrate screen 13, in the present embodiment, the packaging portion 5 also includes a first hole packaging portion 53 and a second hole packaging portion 54; the first hole packaging portion 53 is formed by welding a welding sheet to the periphery of the packaging hole 3 located on the liquid inlet screen 11; the second hole packaging portion 54 is formed by welding a welding sheet to the periphery of the packaging hole 3 located on the filtrate screen 13, or is formed by the glue solidifying or curing to the periphery of the packaging hole 3 located on the filtrate screen 13.

[0062] Further, the hardness of the first peripheral encapsulation part 51 is less than the hardness of the second peripheral encapsulation part 52; the hardness of the second peripheral encapsulation part 52 is in the range of 40 to 85D; the ratio of the hardness of the first peripheral encapsulation part 51 to the hardness of the second peripheral encapsulation part 52 is in the range of 0.5 to 0.9:1. Reasonable setting of the hardness of the first peripheral encapsulation part 51 and the second peripheral encapsulation part 52 can, on the one hand, make the second peripheral encapsulation part 52 have better sealing performance, and the hardness of the first peripheral encapsulation part 51 is less than the second peripheral encapsulation part 52, and the hardness of the second peripheral encapsulation part 52 is within a certain ratio range with the hardness of the first peripheral encapsulation part 51, so that the second peripheral encapsulation part 52 can better push the filter membrane against the first peripheral encapsulation part 51.

[0063] In order to make the first peripheral packaging part 51 and the second peripheral packaging part 52 press against each other, thereby increasing the elastic connection sealing effect between the first peripheral packaging part 51 and the filter membrane 12, the projection of the first peripheral packaging part 51 on the plane where the liquid inlet screen 11 is located and the projection of the second peripheral packaging part 52 on the plane where the liquid inlet screen 11 are located partially overlap to form an overlapping area 6, so that the second peripheral packaging part 52 stably adhered to the filter membrane 12 exerts a certain extrusion force on the first peripheral packaging part 51 formed by welding the welding sheet, thereby enhancing the elastic connection sealing effect between the first peripheral packaging part 51 and the filter membrane 12. At the same time, the first peripheral packaging part 51 and the second peripheral packaging part 52 can at least partially press against and press the periphery of the filter membrane 12, which can further avoid the displacement of the filter membrane 12 during the stacking and filtration process, thereby ensuring the sealing effect and effective filtration area of ​​the filter membrane 12.

[0064] Specifically, in this embodiment, the overlap area 6 is arranged in a closed annular shape, so that the first peripheral packaging part 51 and the second peripheral packaging part 52 can press the filter membrane 12 along the periphery of the filter membrane 12 to form a stable clamping of the filter membrane 12. On the one hand, it can increase the sealing effect around the filter membrane 12, the liquid inlet screen 11, and the filtrate screen 13, avoid the mixing of the original liquid and the filtrate in the filter part 1, and ensure the filtering effect of the filter part 1. On the other hand, it can make the force around the filter membrane 12 more uniform, avoid the filter membrane 12 from being offset or wrinkled during the stacking process or the filtering process, avoid the retention of the original liquid and the filtrate, and affect the filtering efficiency. Of course, in other embodiments, a plurality of overlap areas 6 can also be arranged at intervals along the periphery of the filter membrane 12.

[0065] In order to ensure the tight pressing effect of the first peripheral packaging part 51 and the second peripheral packaging part 52 on the filter membrane 12 while reducing the processing difficulty of the first peripheral packaging part 51 and the second peripheral packaging part 52 accordingly, in the present embodiment, the projection area of ​​the first peripheral packaging part 51 on the plane where the filter membrane 12 is located partially overlaps with the projection area of ​​the second peripheral packaging part 52 on the plane where the filter membrane 12 is located, and the second peripheral packaging part 52 does not completely cover the first peripheral packaging part 51. At this time, the maximum distance between the inner edge of the projection area of ​​the first peripheral packaging part 51 on the plane where the filter membrane 12 is located and the inner edge of the projection area of ​​the second peripheral packaging part 52 on the plane where the filter membrane 12 is located is d, and d is not greater than 5 times the thickness of either the liquid inlet screen 11 or the filtrate screen 13. It is worth noting that when the first peripheral packaging part 51 and the second peripheral packaging part 52 are regular rectangles, the inner edge of the projection of the first peripheral packaging part 51 and the inner edge of the projection of the second peripheral packaging part 52 are arranged relatively parallel. At this time, the "maximum distance d" refers to the distance between the inner edge of the projection of the first peripheral packaging part 51 and the inner edge of the projection of the second peripheral packaging part 52; when the inner edge of any one or both of the first peripheral packaging part 51 and the second peripheral packaging part 52 is an irregular rectangular structure, the maximum value of the inner edge of the projection of the first peripheral packaging part 51 and the inner edge of the projection of the second peripheral packaging part 52 can be measured.

[0066] In this embodiment, d can be set to 0.5 mm, 1 mm or 2 mm. In fact, when the value range of d satisfies d≤2 mm, the first peripheral packaging part 51 and the second peripheral packaging part 52 can have a good pressing effect on the filter membrane 12, thereby ensuring the sealing of the filter part 1 and the flatness of the filter membrane 12.

[0067] Embodiment 2

[0068] See also Figure 5 and Figure 6 Based on the above-mentioned embodiment 1, the difference of this embodiment is that the projection of the second peripheral packaging part 52 on the plane where the liquid inlet screen 11 is located completely covers the inner edge of the projection of the first peripheral packaging part 51 on the plane where the liquid inlet screen 11 is located. This setting enables the original liquid on the liquid inlet screen 11 to quickly cover the filtrate screen 13 after passing through the filter membrane 12, thereby avoiding the effective filtration area on the filtrate screen 13 from being covered, thereby further increasing the filtration efficiency of the filter part 1.

[0069] Further, in the present embodiment, the projection of the first peripheral packaging portion 51 on the plane where the liquid inlet screen 11 is located is completely covered by the projection of the second peripheral packaging portion 52 on the plane where the liquid inlet screen 11 is located, so that the distance between the outer edge of the second peripheral packaging portion 52 and the periphery of the liquid inlet screen 11 is less than the distance between the outer edge of the first peripheral packaging portion 51 and the periphery of the liquid inlet screen 11, so that the second peripheral packaging portion 52 can apply pressure to the first peripheral packaging portion 51 as a whole, thereby making the elastic connection seal between the first peripheral packaging portion 51 and the filter membrane 12 tighter and having a better sealing effect. Of course, in other embodiments, the projection of the outer edge of the second peripheral packaging portion 52 on the plane where the liquid inlet screen 11 is located can also coincide with the projection of the outer edge of the first peripheral packaging portion 51 on the plane where the liquid inlet screen 11 is located, and the distance between the outer edge of the second peripheral packaging portion 52 and the periphery of the liquid inlet screen 11 can also be greater than the distance between the outer edge of the first peripheral packaging portion 51 and the periphery of the liquid inlet screen 11.

[0070] Embodiment 3

[0071] See also Figure 7 and Figure 8 Based on the above-mentioned embodiment 2, the difference of this embodiment is that the outer edge of the liquid inlet screen 11 protrudes from the outside of the first peripheral packaging part 51, the outer edge of the filtrate screen 13 is flush with the outer edge of the filter membrane 12, and the liquid inlet screen 11 protrudes from the filter membrane 12 to form a glue infiltration area 7 around the filter part 1. The glue infiltration area 7 is used to fill the glue when the shell 2 is formed, and form a connecting part 8 connected to at least part of the outer edge of the first peripheral packaging part 51 and the second peripheral packaging part 52 and the inner wall of the shell 2, so that a stable connection is formed between the first peripheral packaging part 51, the second peripheral packaging part 52 and the inner wall of the shell 2, and the periphery of the filter part 1 is sealed, thereby increasing the sealing between the filter membrane 12, the liquid inlet screen 11 and the filtrate screen 13 to ensure the sealing effect of the filter part 1. In addition, after being formed, the connecting portion 8 can connect two adjacent liquid inlet screens 11, so that the connecting portion 8 can apply a tensioning force to the liquid inlet screen 11 along the thickness direction of the membrane package, thereby increasing the compression effect of the first peripheral packaging portion 51 and the second peripheral packaging portion 52 on the filter membrane 12, making the force around the filter membrane 12 more uniform, ensuring the flatness of the filter membrane 12, and avoiding the filter membrane 12 from being offset or wrinkled during the filtration process and affecting its filtration efficiency. At the same time, the side wall surface of the filter membrane 12 itself also forms a stable connection with the connecting portion 8, making the force around the filter membrane 12 more uniform, further ensuring the flatness of the filter membrane 12, and avoiding the filter membrane 12 from being offset or wrinkled during the filtration process and affecting its filtration efficiency.

[0072] It is worth noting that the "glue penetration area 7" referred to in the present embodiment is specifically the area where the glue of the shell 2 can penetrate, and in the present embodiment includes the area where the outer edge of the liquid inlet screen 11 protrudes from the outside of the first peripheral packaging part 51, and also includes the area surrounded by the outer edge of the liquid inlet screen 11 protruding from the end face of the first peripheral packaging part 51, the peripheral side of the filter membrane 12, and the peripheral side of the filtrate screen 13.

[0073] Furthermore, in this embodiment, the projection of the second peripheral packaging portion 52 on the plane where the liquid inlet screen 11 is located completely overlaps with the projection of the outer edge of the first peripheral packaging portion 51 on the plane where the liquid inlet screen 11 is located.

[0074] Embodiment 4

[0075] See also Fig. 9 and Fig.10 Based on the above-mentioned embodiment three, the difference of this embodiment is that the filtrate screen 13 protrudes from the outside of the filter membrane 12, and the outer edge of the liquid inlet screen 11 is flush with the outer edge of the filter membrane 12, so that the connecting part 8 can connect two adjacent filtrate screens 13, so that the connecting part 8 can apply a tensioning force to the filtrate screen 13 along the thickness direction of the membrane package, thereby increasing the compression effect of the first peripheral packaging part 51 and the second peripheral packaging part 52 on the filter membrane 12, so that the force around the filter membrane 12 is more uniform, ensuring the flatness of the filter membrane 12, and avoiding the filter membrane 12 from being offset or wrinkled during the filtration process to affect its filtration efficiency. At the same time, the side wall surface of the filter membrane 12 itself also forms a stable connection with the connecting part 8, so that the force around the filter membrane 12 is more uniform, further ensuring the flatness of the filter membrane 12, and avoiding the filter membrane 12 from being offset or wrinkled during the filtration process to affect its filtration efficiency.

[0076] Embodiment 5

[0077] See also Fig.11 and Fig.12Based on the above-mentioned embodiment three, the difference of this embodiment is that the filtrate screen 13 protrudes from the outside of the filter membrane 12, and the outer edge of the liquid inlet screen 11 also protrudes from the outside of the filter membrane 12, so that the connecting part 8 can simultaneously connect all the liquid inlet screens 11 and the filtrate screens 13 of the filter part 1. On the one hand, the molded shell 2 can tighten the liquid inlet screen 11 and the filtrate screen 13 from the peripheral side along the plane direction, thereby increasing the flatness of the liquid inlet screen 11 and the filtrate screen 13, further increasing the flatness of the filter membrane 12, and avoiding the wrinkles of the filter membrane 12 to affect the filtration efficiency. On the other hand, the connecting part 8 can also apply a tensioning force to the liquid inlet screen 11 and the filtrate screen 13 along the thickness direction of the membrane package, thereby increasing the compression effect of the first peripheral packaging part 51 and the second peripheral packaging part 52 on the filter membrane 12, so that the force around the filter membrane 12 is more uniform, further ensuring the flatness of the filter membrane 12, and avoiding the filter membrane 12 from being offset or wrinkled during the filtration process to affect its filtration efficiency.

[0078] 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 filter assembly, comprising a filter portion and a shell disposed around the filter portion; The filter part comprises a liquid inlet screen, a filter membrane and a filtrate screen which are alternately stacked in sequence, and both the liquid inlet screen and the filtrate screen are provided with packaging holes and through holes; The liquid inlet screen and the filtrate screen are both provided with a packaging part for blocking the original liquid and the filtrate in the filtration part from flowing mutually; It is characterized in that The packaging portion located on the liquid inlet screen includes a first peripheral packaging portion arranged around the liquid inlet screen, the first peripheral packaging portion is welded to the liquid inlet screen by a welding sheet, and is elastically connected and sealed with the filter membrane; the packaging portion located on the filtrate screen includes a second peripheral packaging portion arranged around the filtrate screen, the second peripheral packaging portion is bonded and sealed with the filter membrane, and the projection of the first peripheral packaging portion on the plane where the liquid inlet screen is located and the projection of the second peripheral packaging portion on the plane where the liquid inlet screen is located at least partially overlap to form an overlapping area.

2. A filter assembly according to claim 1, characterized in that: The overlapping area is arranged in a closed ring shape, and the maximum distance between the inner edge of the projection area of ​​the first peripheral packaging part on the plane where the filter membrane is located and the inner edge of the projection area of ​​the second peripheral packaging part on the plane where the filter membrane is located is d, and d is not greater than 5 times the thickness of either the liquid inlet screen or the filtrate screen.

3. A filter assembly according to claim 2, characterized in that: The projection of the second peripheral packaging portion on the plane where the liquid inlet screen is located completely covers the inner edge of the projection of the first peripheral packaging portion on the plane where the liquid inlet screen is located.

4. A filter assembly according to claim 2, characterized in that: The value range of d is d≤2mm.

5. A filter assembly according to claim 1, characterized in that: At least the liquid inlet screen and / or the filtrate screen protrudes from the filter membrane to form a glue seepage area around the filter portion; The glue seepage area is used to be filled with glue when the shell is formed, and forms a connection portion between at least a partial outer edge of the first peripheral packaging portion and / or the second peripheral packaging portion and the inner wall of the shell.

6. A filter assembly according to claim 5, characterized in that: The outer edge of the liquid inlet screen protrudes from the outer side of the first peripheral packaging portion.

7. A filter assembly according to claim 1, characterized in that: Along the thickness direction of the filter part, the outermost layer of the filter part is arranged as a liquid inlet screen.

8. A filter assembly according to claim 1, characterized in that: The thickness of the second peripheral packaging portion protruding from the end surface of the filtrate screen is in the range of 0.01 to 2 mm.

9. A filter assembly according to claim 8, characterized in that: The packaging part also includes a first hole packaging part and a second hole packaging part; The first hole packaging portion is formed by welding a welding sheet to the periphery of the packaging hole located on the liquid inlet screen; The second hole encapsulation part is formed by welding a welding sheet to the periphery of the encapsulation hole on the filtrate screen, or by solidifying or curing glue to the periphery of the encapsulation hole on the filtrate screen.

10. A filter assembly according to any one of claims 1 to 9, characterized in that: The hardness of the first peripheral packaging portion is less than the hardness of the second peripheral packaging portion; The hardness of the second peripheral packaging portion ranges from 40 to 85D; The ratio of the hardness of the first peripheral packaging portion to the hardness of the second peripheral packaging portion is in the range of 0.5 to 0.9:1.

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