A filter assembly

Abstract

The application discloses a filter assembly and belongs to the filtering field, and solves the problem that the filter membrane is damaged due to the bending of the support plate and the intensified abrasion of the filter membrane. The technical solution for solving the problem is that a support body is arranged between two adjacent support plates, the support body supports and holds the central region of the support plate at the two ends at least, so as to prevent the central region of the support plate from warping. The application is mainly used for effectively preventing the downward bending or warping of the support plate, maintaining the straight extension of the whole support plate, avoiding the damage of the filter membrane, and forming the flow channel with uniform size between the adjacent support plates, so that the fluid can flow through the adjacent filter units quickly, and the filtering efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of filtration, and in particular to a filtration assembly. Background Technology

[0002] A filter assembly is disclosed in utility model patent with publication number CN216825674U, including a first end piece, a second end piece, and a plurality of filter elements sealed and stacked between the two. The filter elements include a support plate and a filter membrane sealed and fixed to its two end faces. The filter membrane is laid flat and extends in a direction parallel to the first end piece and the second end piece. The filter membrane is positioned in the upstream chamber. The support plate has a filtrate discharge channel that communicates with both the downstream surface of the filter membrane and the downstream chamber.

[0003] To increase the filtration area of ​​the filter assembly, the membrane area needs to be increased. Correspondingly, a support plate with a larger surface area is required, sealing and fixing the larger membrane to the corresponding positions on both ends of the support plate, which is of a matching size. During the manufacturing process of the filter assembly, after the filter membrane is welded to obtain the filter element, it needs to be cleaned and dried. After the drying process, the central area of ​​the large-sized support plate will develop severe warping or bending in one direction. This warping or bending of the central area of ​​the support plate will contact and press against the filter membrane located in that direction. On the one hand, the gap (flow channel) between the central area of ​​the support plate and the corresponding area of ​​the filter membrane disappears, hindering the rapid passage of fluid through the corresponding area of ​​the filter membrane. On the other hand, the downward bending or warping area of ​​the support plate will contact and squeeze the corresponding area of ​​the filter membrane, creating friction in the same direction as the bending. After a period of time, the filter membrane wear intensifies, eventually leading to damage and increasing the risk of leakage. In addition, after the filter membrane is bent, the preset uniform gap between adjacent filter units becomes uneven. Some gaps become larger and some become smaller. In some cases, the filter membranes of adjacent filter units even stick together, resulting in a decrease in the uniformity of the overall flow channel. Summary of the Invention

[0004] The purpose of this invention is to provide a filter assembly that effectively prevents the support plate from bending or warping downwards, maintains the overall straight extension of the support plate, avoids damage to the filter membrane, and also forms uniformly sized flow channels between adjacent support plates, so that fluid can flow quickly between adjacent filter units, which is beneficial to improving filtration efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a filter assembly, comprising a first end piece, a second end piece, and a filter unit sealed and stacked between the two, the filter assembly having a fluid inlet, a fluid outlet, and an upstream cavity communicating with the fluid inlet, the filter unit comprising a support plate and filter membranes sealed and fixed at both ends of the support plate, the support plate and the filter membranes at both ends forming a downstream cavity communicating with the fluid outlet, a support body provided between two adjacent support plates, the support body at least supporting and holding the central area of ​​the support plates at both ends to prevent the central area of ​​the support plate from warping.

[0006] Furthermore, in two adjacent support plates, a support body is provided on one end face of one support plate, and the support body abuts against the other support plate; or, a support body is provided on both end faces of the support plate, and in two adjacent support plates, the support body of one support plate abuts against the support body of the other support plate.

[0007] Furthermore, the support plate has annular first sealing end faces at both ends, which are sealed and fixed to the outer ring of the filter membrane. The support body is located within the area enclosed by the first sealing end faces. A second sealing end face is provided on the support plate on the outer periphery of the support body or on the end face of the support body. The filter membrane has mounting through holes, and the edge of the mounting through holes is sealed and fixed to the second sealing end faces. In addition to receiving outward tension at the outer ring, the filter membrane can also receive inward tension through the second sealing end faces, making the filter membrane flatter and less prone to dents or bulges. Therefore, it is less likely to come into contact with the support plate and wear down, which helps to ensure the service life of the filter membrane. At the same time, it can also ensure the uniformity of the flow channel between the filter membrane and the support plate, which is conducive to the rapid flow of the filtered fluid (filtrate) and improves the filtration efficiency.

[0008] Furthermore, the second sealing end face is flush with the first sealing end face on the same end face of the support plate. A connecting plate is provided in the downstream cavity, connecting the first and second sealing end faces. The end face of the connecting plate has multiple guide ribs extending from the fluid inlet to the fluid outlet. A guide groove is formed between adjacent guide ribs. The guide ribs are lower than the first and second sealing end faces. The flushness of the second sealing end face with the first sealing end face on the same end face of the support plate helps maintain good flatness of the filter membrane. The filtrate flows along the guide groove, allowing for smoother flow and discharge from the downstream cavity. The lower position of the guide ribs prevents the filter membrane from sticking tightly to the guide ribs after wetting.

[0009] Furthermore, the support body is a block structure, and the end face of the support body is circular, elliptical, or polygonal. The block structure support body can achieve better structural strength, is relatively easy to process, and has a lower cost.

[0010] Furthermore, the support body is provided at the center of the end face of the support plate; or, multiple supports are arranged along the center line of the support plate. Providing only one support body reduces the area occupied by the support body, ensuring the filter membrane has a sufficiently large filtration area, which is beneficial for improving the filtration efficiency of the filter assembly. Placing the support body at the center of the end face of the support plate or along the center line of the support plate provides the best support effect for the support plate and also allows for relatively uniform tension between the second sealing end face and the filter membrane, which is also beneficial for maintaining good flatness of the filter membrane.

[0011] Furthermore, the support plate has at least two partitions on the end face with the support body. The filter membrane is sealed and fixed to the edge of the partition, forming a downstream cavity within the partition. The support body is located outside the partition and fixedly connected to the adjacent partition. The partitions reduce the width or length of the filter membrane, increasing the tension on the filter membrane. This further reduces the bending (concavity or bulging) of the filter membrane, thereby reducing the compressive force between the filter membrane and the bent support plate, thus reducing the tensile force on the filter membrane and ensuring its service life. The support body fixedly connected between the partitions also supports and holds adjacent support bodies, maintaining the straight extension of the support plate.

[0012] Furthermore, the edge of the partition is provided with an annular first sealing end face, which is sealed and fixed to the outer ring of the filter membrane, and the end face of the support body protrudes relative to the first sealing end face. This allows a flow channel to be formed between the filter membranes on two adjacent support plates, which is beneficial for the uniform distribution of fluid to the upstream surface of the filter membrane.

[0013] Furthermore, the support extends into a long strip along the edge of adjacent partitions; alternatively, the support is protruding and multiple supports are arranged along the edge of adjacent partitions, with through holes penetrating the support plates between adjacent supports, and all through holes in the support plates are interconnected. The long strip-shaped support can provide uniform reinforcement to two adjacent partitions, resulting in stronger support and holding force on adjacent support plates. The interaction force between the two partitions and the support can be used to further enhance the tension of the filter membrane. The protruding structure of the support reduces voids during support molding, improves the structural quality of the support, and the through holes allow the fluid to be filtered to be dispersed more quickly and evenly onto the upstream surface of the filter membrane.

[0014] Furthermore, each end face of the support plate is provided with two identical rectangular partitions. The two partitions on each end face are symmetrical with respect to the center line of the support plate. The end face of the support body protrudes from the end face of the partition on the same end face of the support plate, and the end faces of the support bodies between adjacent support plates abut against each other.

[0015] Furthermore, the partition is provided with a through groove penetrating the support plate, and the through grooves in the two partitions on the same end face of the support plate are symmetrical with respect to the center line of the support plate. The through groove can relieve the stress on the support plate and improve the overall flatness of the support plate.

[0016] Furthermore, one of the filter units is connected to the first end piece, and a support body is provided on the end face of the filter unit facing the first end piece. The end face of the support body has a flow gap or abuts against the first end piece; and / or, one of the filter units is connected to the second end piece, and a support body is provided on the end face of the filter unit facing the second end piece. The end face of the support body has a flow gap or abuts against the second end piece. Providing a flow gap allows for good flow between the support plate and the upstream cavity of the first / second end piece; the abutting between the end face of the support body and the first / second end piece further improves the support effect.

[0017] By adopting the above technical solution, the present invention has the following advantages: When multiple support plates are stacked, the supports between adjacent support plates can support each other, supporting the central area of ​​the support plates at both ends. The multiple supports and support plates form a whole, greatly enhancing the structural strength and making the whole less prone to bending. Even if one support plate bends, it will tend to return to its flat state due to the support of other support plates. Therefore, it greatly improves the uniformity of the overall flow channel and can even reduce the flatness requirements of individual support plates in a filter assembly. Thus, it effectively prevents the support plates from bending downwards or warping, maintaining the overall straight extension of the support plates, avoiding damage to the filter membrane, and also forming uniformly sized flow channels between adjacent support plates, allowing fluid to flow quickly between adjacent filter units, which is beneficial for improving filtration efficiency. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram (a) of a box-type filter assembly according to the present invention;

[0020] Figure 2 This is a schematic diagram (II) of the structure of a box-type filter assembly according to the present invention;

[0021] Figure 3 This is a schematic diagram of a support plate in a box-type filter assembly according to the present invention;

[0022] Figure 4 This is a schematic diagram of a filter unit in a box-type filter assembly according to the present invention;

[0023] Figure 5 This is a cross-sectional view of a box-type filter assembly according to the present invention;

[0024] Figure 6 for Figure 5 Enlarged view of point I in the middle;

[0025] Figure 7 for Figure 5 Enlarged view at point II;

[0026] Figure 8 This is a top view (elliptical) of a filter unit in a box-type filter assembly according to the present invention;

[0027] Figure 9 This is a top view (rectangular) of a filter unit in a box-type filter assembly according to the present invention;

[0028] Figure 10 This is a top view (multiple supports) of a filter unit in a box-type filter assembly according to the present invention;

[0029] Figure 11 This is a top view of a support plate (two sections, long strip-shaped support body) in a box-type filter assembly according to the present invention.

[0030] Figure 12 This is a top view of a filter unit in a box-type filter assembly of the present invention (two partitions, long strip-shaped support);

[0031] Figure 13 for Figure 12 Sectional view along the middle AA direction;

[0032] Figure 14 for Figure 13 Enlarged view of section III;

[0033] Figure 15 for Figure 11 A schematic diagram of the support plate shown;

[0034] Figure 16 for Figure 15 Enlarged view of section IV;

[0035] Figure 17 for Figure 15 Enlarged view of the middle V section;

[0036] Figure 18 This is a top view of a filter unit in a box-type filter assembly of the present invention (two partitions, protruding support body);

[0037] Figure 19 for Figure 18 Sectional view along the BB direction;

[0038] Figure 20 for Figure 19 Enlarged view of section VI;

[0039] Figure 21 This is a schematic diagram of a support plate in a box-type filter assembly of the present invention (with through grooves provided within the partitions). Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0042] It should be understood that in the various embodiments of the present invention, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0043] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0044] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0045] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0046] like Figures 1 to 7As shown, the present invention provides a filtration assembly, including a first end piece D1, a second end piece D2, and a filtration unit F1 sealed and stacked between the two. The filtration assembly has a fluid inlet, a fluid outlet, and an upstream cavity G1 communicating with the fluid inlet. The filtration unit includes a support plate 1 and filter membranes 9 sealed and fixed to both ends of the support plate 1. The support plate 1 has a first through hole 11 and a second through hole 12. The first through hole 11 communicates with the fluid inlet, and the second through hole 12 communicates with the fluid outlet. The support plate 1 and the filter membranes 9 at both ends form a downstream cavity G2 communicating with the second through hole 12. A support body 2 is provided between two adjacent support plates 1. The support body 2 at least supports and holds the central area of ​​the support plates 1 at both ends to prevent the central area of ​​the support plate 1 from warping. The raw liquid flows into the first through hole 11 from the fluid inlet, diffuses through the first through hole 11 to the upstream cavity G1, and then enters the downstream cavity G2 after being filtered by the filter membrane 9. The filtrate in the downstream cavity G2 flows into the second through hole 12 and is finally discharged from the fluid outlet.

[0047] When multiple support plates 1 are stacked, the support bodies 2 between adjacent support plates 1 can support each other, supporting the central area of ​​the support plates 1 at both ends. The multiple support bodies 2 and support plates 1 form a whole, greatly enhancing the structural strength and making the whole less prone to bending. Even if one support plate 1 bends, it will tend to return to flatness due to the support of other support plates 1. Therefore, it greatly improves the uniformity of the overall flow channel and can even reduce the flatness requirements of individual support plates 1 in a filter assembly. Thus, it can effectively prevent the support plates 1 from bending downwards or warping, maintaining the overall straight extension of the support plates 1, and avoiding excessive contact with the filter membrane 9 due to bending or warping of the support plates 1, which would then rub against and damage the filter membrane 9. In addition, a uniformly sized flow channel can be formed between adjacent support plates 1, so that the fluid can flow quickly between adjacent filter units, which is beneficial to improving filtration efficiency.

[0048] The structure of the fluid inlet and outlet can refer to existing technologies, for example, they can be set through the end face of the first end member D1 or the end face of the second end member D2. The first end member D1 has a first through hole D11 and a second through hole D12, and the second end member D2 has a third through hole D21 and a fourth through hole D22 that communicate with the first through hole D11 and the second through hole D12 respectively. The first through hole D11 and the third through hole D21 are both connected to the first through hole 11, and the second through hole D12 and the fourth through hole D22 are both connected to the second through hole 12. This form is suitable for situations where multiple box-type filter assemblies need to be stacked together in a sealed manner, and the filtration area can be expanded as needed. The fluid inlet and fluid outlet can both be located on the first end member D1, or both on the second end member D2, or one can be located on the first end member D1 and the other on the second end member D2. However, the latter two forms of box-type filter assemblies are not suitable for stacking and can only be used individually.

[0049] In a filter assembly, one filter unit F1 is connected to a first end member D1. A support body 2 is provided on the end face of the support plate 1 of the filter unit F1 facing the first end member D1. A flow gap G3 exists between the end face of the support body 2 and the first end member D1, allowing good flow between the support plate 1 and the upstream cavity of the first end member D1. Alternatively, the end face of the support body 2 can abut against the first end member D1 to further improve the support effect. Similarly, one filter unit F1 is connected to a second end member D2. A support body 2 is provided on the end face of the support plate 1 of the filter unit F1 facing the second end member D2. A flow gap exists between the end face of the support body 2 and the second end member D2, or they abut against each other.

[0050] In one embodiment, in two adjacent support plates 1, a support body 2 can be disposed on one end face of one support plate 1, with the support body 2 abutting against the other support plate 1. This is equivalent to each support plate 1 having a support body 2 on one end face and not on the other end face, requiring only the surface that abuts against the end face of the support body 2 to be provided. The support body 2 can be integrally formed with one of the support plates 1, or it can be separately processed and then fixed to the support plate 1 using common processes such as welding. In another embodiment, support bodies 2 are provided on both end faces of the support plate 1. In two adjacent support plates 1, the support body 2 of one support plate 1 abuts against the support body 2 of the other support plate 1, meaning that each support plate 1 has a support body 2 on both end faces. The abutting contact mentioned here can be the end face of the support body 2 abutting against the end face of the support plate 1 / support body 2, or it can be welding or bonding, etc.

[0051] In one embodiment, to prevent fluid leakage and flow into the second through hole 12 without filtration by the filter membrane 9, the support plate 1 can be designed to have a first annular sealing rib 14 and a first sealing rib 15 located within the area enclosed by the first annular sealing rib 14. The first annular sealing rib 14 surrounds the first through hole 11 and the second through hole 12. The first annular sealing rib 14 is sealed to the first annular sealing rib 14 of the adjacent support plate 1 or sealed to the first end member D1 / second end member D2, thereby ensuring that the fluid is confined by the first annular sealing rib 14 within the filter assembly and between two adjacent filter units F1. The first sealing rib 15 is sealed to the first sealing rib 15 of the adjacent support plate 1 or sealed to the first end member D1 / second end member D2. The first sealing rib 15 separates the first through hole 11 and the second through hole 12, thereby ensuring that the fluid must pass through the filter membrane 9 and will not flow directly from the first through hole 11 to the second through hole 12.

[0052] To achieve a sealed connection with the filter membrane 9, annular first sealing end faces 101 can be provided at both ends of the support plate 1. The first sealing end faces 101 are sealed and fixed to the outer ring of the filter membrane 9. In one embodiment, the support body 2 is located within the area enclosed by the first sealing end faces 101. The end face of the support body 2 is provided with a second sealing end face 201. The filter membrane 9 is provided with a mounting through hole 901, and the edge of the mounting through hole 901 is sealed and fixed to the second sealing end face 201. In addition to the outward tension on the outer ring, the filter membrane 9 can also obtain an inward tension through the second sealing end face 201, making the filter membrane 9 flatter and less prone to dents or bulges. Therefore, it is less likely to come into contact with the support plate 1 and wear, which helps to ensure the service life of the filter membrane 9. At the same time, it can also ensure the uniformity of the flow channel between the filter membrane 9 and the support plate 1, which is conducive to the rapid flow of the filtered fluid (filtrate) and improves the filtration efficiency. In another embodiment, a second sealing end face 201 may be provided on the support plate 1 on the outer periphery of the support body 2, that is, the second sealing end face 201 is provided on the end face of the support plate 1 and surrounds the outer periphery of the support body 2.

[0053] The second sealing end face 201 is flush with the first sealing end face 101 on the same end face of the support plate 1, which helps the filter membrane 9 maintain good flatness. In order to make the filtrate flow more smoothly in the downstream cavity G2, a connecting plate 13 connecting the first sealing end face 101 and the second sealing end face 201 can be provided in the downstream cavity G2. The end face of the connecting plate 13 is provided with multiple guide ribs 131. The guide ribs 131 extend along the direction from the first through hole 11 to the second through hole 12. A guide groove 132 is formed between two adjacent guide ribs 131. The filtrate flows along the guide groove 132, which can flow more smoothly and be discharged from the downstream cavity G2 into the second through hole 12. The guide ribs 131 are lower than the first sealing end face 101 and the second sealing end face 201, which can prevent the filter membrane from sticking tightly to the guide ribs 131 after wetting.

[0054] In the aforementioned embodiments, the first through hole 11 and the second through hole 12 are located at both ends of the support plate 1 along its length. In another embodiment, the second through hole 12 can be located on the support body 2 and penetrate through the end face of the support body 2, which is equivalent to the second through hole 12 being centrally located relative to the support plate 1. The support body 2 is provided with a second annular sealing surface 202 on the outer periphery of the second through hole 12. The second annular sealing surface 202 is located inside the second sealing end face 201. The second annular sealing surface 202 is sealed and connected to the adjacent support plate 1, separating the second through hole 12 from the first through hole 11. The support body 2 is provided with a filtrate discharge channel 102 that extends from the downstream cavity G2 to the second through hole 12.

[0055] To increase the flowability of the filtered fluid, the downstream cavities G2 at both ends of the support plate 1 can be connected. The connecting plate 13 has a through hole 105 at the end of the guide groove 132 near the first through hole 11, connecting the two downstream cavities G2. (Refer to...) Figure 6 The through hole 105 can balance the fluid pressure in the two downstream chambers G2. To ensure smooth discharge of the filtered fluid, a confluence hole 106 penetrating the two downstream chambers G2 can be provided on the connecting plate 13 at one end of the guide groove 132 near the second through hole 12. (Refer to...) Figure 7 The manifold 106 is connected to the second through hole 12 through the filtrate discharge channel 102. The filtrate accumulates at the end of the guide groove 132 near the second through hole 12 through the manifold 106, increasing the fluid pressure, which is conducive to the discharge of the filtrate into the filtrate discharge channel 102. The downstream cavities G2 on the two end faces can share the same filtrate discharge channel 102, which simplifies the structure.

[0056] To achieve better structural strength, the support 2 can be selected as a block structure. For ease of processing, the shape of the end face of the support 2 can be selected as follows: Figure 4 The circle shown, or select Figure 8 The ellipse shown, or select Figure 9 The polygons shown, such as rectangles, etc.

[0057] In one embodiment, to satisfy the purpose of the invention, only one support 2 may be provided and located at the center of the end face of the support plate 1, i.e. Figure 4 , Figure 8 and Figure 9 As shown, reducing the area occupied by the support 2 ensures that the filter membrane 9 has a sufficiently large filtration area, which is beneficial to improving the filtration efficiency of the filter assembly. In filter assemblies with a larger area or a thinner support plate 1, or to further improve the support effect, the number of supports 2 can be increased, for example... Figure 10 As shown, the support 2 is along the center line of the support plate 1 ( Figure 10 Multiple supports (with midpoint lines) are arranged so that the support body 2 is positioned on the center line of the support plate 1. This arrangement provides the best support for the support plate and ensures that the tension between the second sealing end face 201 and the filter membrane 9 is relatively uniform, which also helps the filter membrane 9 maintain good flatness. The center line of the support plate 1 can be understood as the line connecting the midpoints of all the widths of the support plate 1.

[0058] In addition to using support body 2 to prevent support plate 1 from bending downwards or warping and maintaining the overall straight extension of support plate 1, based on the above embodiment, partitions 100 can be set on the end face of support plate 1. These partitions reduce the width or length of the filter membrane, increasing the tension on the filter membrane and reducing the bending (concavity or bulging) amplitude of the filter membrane. This reduces the compressive strength between the filter membrane and the bent support plate, thereby reducing the tensile force on the filter membrane and ensuring its service life. The supports fixedly connected between the partitions also serve to support and hold adjacent supports, maintaining the straight extension of the support plate. For details, please refer to... Figures 11 to 17.

[0059] In one embodiment, the support plate 1 has two partitions 100 on the end face where the support body 2 is located. The filter membrane 9 is sealed and fixed to the edge of the partition 100, forming a downstream cavity G2 within the partition 100. The support body 2 is located outside the partition 100 and is fixedly connected to the adjacent partition 100. The fixed connection between the support body 2 and the adjacent partition 100 can further improve the strength of the support and connection force on the middle area of ​​each partition 100. Therefore, after cleaning and drying, the filter unit provided by this invention will not bend in the middle area of ​​the support plate 1, that is, the bending amplitude of each partition 100 is greatly reduced, the squeezing force between the middle area of ​​the filter membrane 9 of each partition 100 and the bent support plate 1 is reduced, thereby reducing the tensile force on the filter membrane 9, protecting the filter membrane 9, and allowing the filter membrane 9 to cover the two ends of each partition 100 relatively flat, and maintain a certain uniform gap between the filter membrane 9 and the two ends of each partition 100, which is conducive to the rapid passage of fluid through the filter membrane 9. Correspondingly, the uniformity of the overall flow channel of the filter is also improved. Furthermore, the sealing and fixing effect between the filter membrane 9 and the support plate 1 will not be weakened, that is, the sealing connection performance between the filter membrane 9 and the support plate 1 will not be damaged. This avoids bending or warping in the middle area of ​​the support plate 1, thereby preventing damage to the sealing and fixing effect between the filter membrane 9 and the support plate 1, ensuring a reliable sealing connection between the filter membrane 9 and the support plate 1, and always leaving a gap between the filter membrane 9 and the support plate 1, and further ensuring the uniformity of the overall flow channel within the filter assembly.

[0060] In one embodiment, to facilitate smoother fluid flow within partition 100, multiple guide ribs 131 can be provided within partition 100. The guide ribs 131 extend along the direction from the first through hole 11 to the second through hole 12, with their end faces lower than the first sealing end face. Adjacent guide ribs 131 form guide grooves 132. The filtered fluid (filtrate) flows along the guide grooves 132, allowing for smoother flow, which facilitates timely discharge of the filtered fluid and allows subsequent fluid to pass through the filter membrane 9 into partition 100, thereby improving filtration efficiency. To discharge the filtered fluid from partition 100, a filtrate discharge channel 102 is provided on the edge of partition 100. The downstream cavity G2 communicates with the second through hole 12 through the filtrate discharge channel 102. The filtrate discharge channel 102 can be a row of through holes or a strip-shaped channel structure, as long as the fluid can flow smoothly out.

[0061] In this embodiment, the edge of partition 100 is provided with an annular first sealing end face 101. The first sealing end face 101 is sealed and fixed to the outer ring of the filter membrane 9. The end face of the support body 2 protrudes relative to the first sealing end face 101, so that a flow channel is formed between the filter membranes 9 on two adjacent support plates 1.

[0062] In one embodiment, the support 2 extends into a strip along the edge of the adjacent partition 100. The strip-shaped support 2 can provide uniform reinforcement to the two adjacent partitions 100, and the support and holding effect formed on the adjacent support plate is stronger. The interaction force between the two partitions 100 and the support 2 can be used to further enhance the tension of the filter membrane 9.

[0063] In a preferred embodiment, when both end faces of the support plate 1 are provided with support bodies 2, each end face of the support plate 1 has two identical rectangular partitions 100. The two partitions 100 on each end face are symmetrical with respect to the center line of the support plate 1. The end face of the support body 2 protrudes from the end face of the partition 100 on the same end face of the support plate 1, and the end faces of the support bodies 2 between adjacent support plates 1 abut against each other. The support body 2 is located on the center line of the support plate 1, which can better reduce the bending of the support plate 1. In practical applications, the partitions 100 on the two end faces of the support plate 1 may not overlap, and the partitions 100 on the same end face may be asymmetrical.

[0064] The above embodiment illustrates a relatively basic structure, with two rectangular partitions 100. In practical applications, the number of partitions 100 can be increased according to actual needs, and the shape of the partitions 100 is not limited to rectangles; common and easily formed shapes such as squares and circles are also feasible. Increasing the number of partitions 100 reduces the area of ​​each individual partition 100, thereby increasing structural strength and effectively reducing wear on the filter membrane 9, thus protecting the filter membrane 9.

[0065] To increase the flowability of the filtered fluid, the downstream cavities G2 at both ends of the support plate 1 can be connected. Specifically, a through hole 105 connecting the two overlapping partitions 100 can be provided at the end of the flow guide groove near the first through hole 11. The through hole 105 can balance the fluid pressure in the two partitions 100. It is understood that if the other end face of the support plate 1 does not have a partition 100, a through hole 105 can also be provided to connect the downstream cavity G2 in partition 100 with the downstream cavity G2 on the other end face.

[0066] Similarly, when the partitions 100 on the two end faces of the support plate 1 overlap, to ensure smooth discharge of the filtered fluid, a confluence hole 106 can be provided at the end of the guide groove near the second through hole 12 within the two overlapping partitions 100, penetrating both partitions 100. The confluence hole 106 communicates with the second through hole 12 through the filtrate discharge channel 102. The filtrate accumulates at the end of the guide groove near the second through hole 12 via the confluence hole 106, increasing the fluid pressure and facilitating discharge into the filtrate discharge channel 102. Since the partitions 100 on both end faces can share the same filtrate discharge channel 102, the structure can be simplified. It is understandable that if the other end face of the support plate 1 does not have a partition 100, a confluence hole 106 can also be provided to connect the downstream cavity G2 within partition 100 to the downstream cavity G2 on the other end face.

[0067] In addition to the elongated support 2, such as Figures 18 to 20 As shown, in another embodiment, the support 2 can also be selected as a protrusion shape, with multiple protrusions arranged along the edges of adjacent partitions 100. A through hole 103 penetrating the support plate 1 is provided between two adjacent support bodies 2, and all through holes 103 of the support plates 1 are interconnected. The protrusion-shaped structure can reduce voids during the molding of the support 2, improving the structural quality of the support 2. The through holes 103 allow the fluid to be filtered to be dispersed more quickly and evenly onto the upstream surface of the filter membrane 9.

[0068] Additionally, partition 100 is provided with a through groove 104 that penetrates the support plate 1, see Figure 21 The through grooves 104 within the two partitions 100 on the same end face of the support plate 1 are symmetrical with respect to the centerline of the support plate 1. The through grooves can relieve stress on the support plate, improve the overall flatness of the support plate, and thus reduce the compressive force between the filter membrane 9 and the support plate 1, reducing the tensile strength of the filter membrane 9. The through grooves 104 can extend along the direction perpendicular to the long side of the partition 100 or be cross-shaped.

[0069] The support plate may also omit the first and second through holes, with the upstream cavity directly connected to the fluid inlet and the downstream cavity directly connected to the fluid outlet via the filtrate discharge channel. For a specific structure, please refer to Embodiment 1 in utility model patent CN213790973U. Figures 1 to 6 The structure of the disclosed membrane support plate 30 may have only a first through hole and no second through hole, or no first through hole and only a second through hole. The specific choice can be made according to actual needs.

[0070] For prior art not described in this invention, please refer to utility model patent CN216825674U. In addition to the preferred embodiments described above, this invention has other embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection claimed by this invention.

Claims

1. A filter assembly comprising a first end member, a second end member, and a filter unit sealed and stacked therebetween, the filter assembly having a fluid inlet, a fluid outlet, and an upstream cavity communicating with the fluid inlet, the filter unit comprising a support plate and filter membranes sealed and fixed at both ends of the support plate, the support plate and the filter membranes at both ends forming a downstream cavity communicating with the fluid outlet, characterized in that, A support body is provided between two adjacent support plates. The support body supports and holds the central area of ​​the support plates at both ends to prevent the central area of ​​the support plates from warping. In two adjacent support plates, a support body is provided on one end face of one support plate and abuts against the other support plate; or, a support body is provided on both end faces of the support plates, and in two adjacent support plates, the support body of one support plate abuts against the support body of the other support plate. The support plate has at least two partitions on the end face with the support body. The filter membrane is sealed and fixed to the edge of the partition, forming a downstream cavity in the partition. The support body is located outside the partition and is fixedly connected to the adjacent partition. The support extends in the form of a strip along the edge of the adjacent partition; or, the support is in the form of a protrusion and multiple such protrusions are arranged along the edge of the adjacent partition.

2. The filter assembly according to claim 1, characterized in that, The edge of the partition is provided with an annular first sealing end face, which is sealed and fixed to the outer ring of the filter membrane, and the end face of the support body protrudes relative to the first sealing end face.

3. The filter assembly according to claim 1, characterized in that, When the support body is convex and multiple supports are arranged along the edges of adjacent partitions, a through hole is provided between two adjacent supports, and the through holes of all supports are connected.

4. The filter assembly according to claim 1 or 3, characterized in that, The support plate has two identical rectangular partitions on both ends. The two partitions on each end are symmetrical with respect to the center line of the support plate. The end face of the support body protrudes from the end face of the partition on the same end face of the support plate. The end faces of the support bodies between adjacent support plates abut against each other.

5. The filter assembly according to claim 4, characterized in that, The partition is provided with a through groove that penetrates the support plate, and the through grooves in the two partitions on the same end face of the support plate are symmetrical with respect to the center line of the support plate.

6. The filter assembly according to claim 1, characterized in that, One of the filter units is connected to the first end piece, and the support plate of the filter unit has a support body on the end face facing the first end piece, and the end face of the support body has a flow gap or abuts against the first end piece; and / or, one of the filter units is connected to the second end piece, and the support plate of the filter unit has a support body on the end face facing the second end piece, and the end face of the support body has a flow gap or abuts against the second end piece.

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