A diaphragm holder and filter

Abstract

The application provides a diaphragm holder and a filter. The diaphragm holder comprises a center guide pipe and a flow guide plate. The center guide pipe comprises a fixing ring and a plurality of center rods. The center rods are arranged in a circumferential interval along the fixing ring. The fixing ring is used for binding the center rods. Each center rod passes through a pipe inner cavity to form the center guide pipe. A gap for inserting the flow guide plate is formed between two adjacent center rods and communicates with the pipe inner cavity. After the flow guide plate is inserted, the two adjacent center rods limit and hold the flow guide plate, thereby improving the installation stability of the flow guide plate. Meanwhile, the adjacent flow guide plates and the center rods pass through a compartment to accommodate a filter membrane. The flow guide plate guides filtrate in the compartment to the gap and then to the pipe inner cavity of the center guide pipe through the gap, thereby avoiding the generation of a "detour" flow path and improving the overall filtering efficiency of the filter.

Description

Technical Field

[0001] This invention relates to the technical field of filtration equipment, and in particular to a diaphragm retainer and filter. Background Technology

[0002] Filters (filter cartridges) are commonly used for liquid filtration. They primarily work by using an internal filtration membrane to trap relatively large particles in the liquid, thereby purifying it. Because filter cartridges have a high filtration throughput and the trapped particles can be backwashed away, they offer high filtration efficiency and low operating costs, making them widely used in water treatment, beer filtration, beverage filtration, and other fields.

[0003] The filter (filter element) mainly consists of a housing, an inlet end communicating with the housing, and an outlet end. A diaphragm retainer and a hollow fiber membrane are installed inside the housing. The diaphragm retainer acts as a "skeleton structure," supporting the hollow fiber membrane and guiding the flow of the filtrate.

[0004] like Figure 1 and Figure 2 The existing filter diaphragm retainer typically includes an integral central conduit 1 and several guide plates 2. Several diaphragms are fixedly connected to the outer wall of the central conduit 1 along its circumferential direction. Grooves corresponding to the guide plates 2 are formed between adjacent diaphragms, and these grooves communicate with the inner cavity of the central conduit 1. The guide plates 2 are inserted into the grooves, and the guide plates 2, the diaphragms, and the outer wall of the central conduit 1 form a compartment for accommodating the hollow fiber membrane. Several guide grooves are formed on the guide plates 2, and after the guide plates 2 are inserted into the grooves, the guide grooves communicate with the inner cavity of the central conduit 1. During filter use, the feed liquid enters the interior of the hollow fiber membrane, and the filtrate (filtrate after impurity removal) permeates from inside the hollow fiber membrane to the outside of the central fiber membrane and enters the compartment. The filtrate entering the compartment flows along the guide grooves on the guide plates into the inner cavity of the central conduit 1.

[0005] The aforementioned diaphragm retainer has certain shortcomings. First, the integrated central conduit 1 is typically one meter or longer in length, requiring large and complex molds and injection molding machines for manufacturing, resulting in high manufacturing costs. Second, to ensure the stability of the guide plate 2 installation, the diaphragm usually needs a certain height. The filtrate near the outer wall of the central conduit 1 is blocked by the diaphragm, preventing this portion of the filtrate from directly entering the inner cavity of the central conduit 1. That is, this portion of the filtrate requires a relatively "circuitous" flow path to enter the inner cavity of the central conduit 1. The specific flow path is as follows... Figure 2As shown in Z1, the filtrate first flows along the baffle towards the inner cavity of the tube away from the central conduit 1 until it reaches the opening of the groove, and then enters the inner cavity of the central conduit 1 through the groove. This "detour" filtrate will interfere with the filtrate that enters the inner cavity of the tube along the guide groove, resulting in low overall filtration efficiency of the filter.

[0006] To address the aforementioned issues, Chinese invention patent application CN102245282A discloses a method for forming a diaphragm retainer and a diaphragm retainer formed in this way. The diaphragm retainer is formed by splicing together multiple first boxes 2A and second boxes 2B with roughly identical structures. Specifically, taking the second box 2B as an example, the second box includes a bridging member and walls snap-fitted to both sides of the bridging member. Each of the first boxes 2A and second boxes 2B, in its assembled state, can form a diaphragm retainer, while the bridging member surrounds and forms a central conduit. In the aforementioned patent, the diaphragm retainer employs a highly fragmented splicing method, significantly reducing manufacturing costs. Simultaneously, the outer peripheral wall of the central conduit in the aforementioned diaphragm retainer does not have a "groove" structure, which to some extent improves the problem of "detour" in the filter's filtrate.

[0007] However, the aforementioned diaphragm retainer also has certain shortcomings. The high filtration efficiency of the filter to some extent means a high impact of the filtrate on the central conduit, especially under specific operating conditions, such as when rapidly filtering a liquid containing a certain amount of gas. Due to the presence of gas, the impact force generated during rapid filtration of the liquid is relatively large. The bridging component (central conduit) is snap-fitted to the wall (guide plate), which has relatively insufficient stability. After prolonged filtration, the central conduit and guide plate are easily moved relative to each other under the impact force of the filtrate, further deteriorating the stability of the central conduit and potentially reducing the filtration efficiency of the filter.

[0008] In summary, how to obtain a filter that achieves both high stability and high filtration efficiency is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a diaphragm retainer and filter.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A diaphragm retainer includes a central conduit and a guide plate. The central conduit includes: a retaining ring; a plurality of central rods, each central rod arranged circumferentially spaced along the retaining ring, the retaining ring constraining the central rods; each central rod passing through a cavity surrounding the central conduit; a slit communicating with the cavity between adjacent central rods for inserting the guide plate, the adjacent central rods clamping the guide plate; and adjacent guide plates and central rods passing through a chamber surrounding the central conduit to accommodate a filter membrane, the guide plate guiding filtrate in the chamber to the slit and through the slit to the cavity of the central conduit.

[0012] Through the above technical solution, compared with the existing integrated central conduit, the central conduit of this application is formed by splicing a fixing ring and a central rod, and the central conduit with a split configuration can significantly reduce its manufacturing cost.

[0013] In this application, the central rods are arranged at intervals around the fixing ring in the circumferential direction to form a "tube structure." The fixing ring binds the central rods, and the cooperation between the central rods and the fixing ring forms the central conduit structure of the diaphragm retainer of this application. The fixing rods surround the inner cavity of the formed central conduit, and gaps are formed between adjacent central rods for inserting guide plates; that is, the gaps formed between adjacent fixing rods communicate with the inner cavity of the central conduit. When the guide plate is inserted into the gap between adjacent central rods, the guide plate inserted in the gap can directly guide the filtrate in the compartment to the gap, and then directly guide this portion of the filtrate through the gap to the inner cavity of the central conduit. Compared to the existing technology where the guide plate is inserted into the "external" groove on the outer wall of the central conduit, the "groove" in this application is set between two adjacent central rods, making the "groove" internal. Both the guide plate and the outer wall of the central conduit are used to directly support the filter membrane fibers, avoiding the problem that the filtrate near the outer wall of the central conduit needs to go through a more "detour" flow path before entering the inner cavity of the central conduit, thus improving the overall filtration efficiency of the filter.

[0014] Meanwhile, the guide plate inserted into the gap is simultaneously clamped and limited by the side walls of the central rod on both sides, which significantly improves the stability of the guide plate installation. Compared to the existing method where the guide plate and the central conduit are assembled by snap-fit, the simultaneous clamping and limiting effect of the central conduit on both sides of the guide plate prevents the guide plate from loosening due to fluid erosion during the use of the diaphragm retainer. This greatly improves the stability of the diaphragm retainer in the assembled state and prevents filtrate from stagnating in areas caused by loosening of the diaphragm retainer, further increasing the filtration efficiency of the diaphragm retainer.

[0015] In summary, the diaphragm retainer provided in this application, when used in a filter, enables the filter to combine the advantages of low cost, high stability, and high filtration efficiency.

[0016] Optionally, the central rod and the fixing ring are connected by welding.

[0017] Optionally, the central rod and the fixing ring are connected by adhesive bonding.

[0018] Preferably, the central conduit further includes a fastening structure, through which the central rod is at least partially engaged with the fixing ring.

[0019] Compared to the welding connection between the center rod and the fixed ring, the snap-fit ​​connection between them creates a detachable link, facilitating the replacement or repair of individual components and allowing for the disassembly and transport of the diaphragm retainer. Compared to the adhesive connection, the snap-fit ​​connection prevents adhesive from dissolving and mixing with the filtrate during filtration, making it particularly advantageous for food-grade filtrates.

[0020] Preferably, the fastening structure is a fastening groove, which includes a first sidewall and a second sidewall; through the first sidewall and the second sidewall, the central rod and the fixing ring form a discontinuous snap-fit ​​engagement.

[0021] More preferably, the center rod and the fixing ring form a discontinuous interference fit.

[0022] Through the above technical solution, the fastening structure is a "groove" structure. It can be understood that the fastening groove can be located on the fixing ring or on the center rod. Similarly, it can be understood that when the fastening groove is located on the fixing ring, the fastening groove can be formed concavely, for example, by the concave outer peripheral wall of the fixing ring. In this case, the first sidewall and the second sidewall are the ring body itself. Alternatively, the fastening groove can be formed convexly. In this case, the first sidewall and the second sidewall are fixedly connected to the outer peripheral wall or the inner peripheral wall of the fixing ring, and the first sidewall, the second sidewall, and the outer wall of the fixing ring surround each other to form a "groove" structure, that is, to form a fastening groove.

[0023] Taking the fastening groove located at the fixed ring as an example, after the central tube and the fixed ring are assembled, the first and second side walls of the fastening groove abut and limit the movement of the two side walls of the central rod. The limiting effect of the first and second side walls ensures the stability of the installation of the central tube and the fixed ring. Preferably, the first and second side walls are interference-fitted with the central tube. The interference fit significantly improves the stability of the installation of the central tube and the fixed ring, that is, it significantly improves the overall robustness of the diaphragm retainer, allowing the diaphragm retainer to withstand larger and faster liquid impacts, thereby significantly improving the overall filtration efficiency of the filter.

[0024] Of course, the first and second side walls abut against the two side walls of the center rod. During the assembly of the center tube and the fixing ring, the first and second side walls will also create certain resistance to the installation of the center rod, which will increase the difficulty of assembling the center rod and the fixing ring to a certain extent. In particular, when the first and second side walls form an interference fit with the center rod, the installation resistance will increase further.

[0025] To mitigate installation resistance, this application employs a discontinuous snap-fit ​​mechanism between the center rod and the fixing ring, at least partially. This discontinuous snap-fit ​​means that when a component is inserted into the mounting cavity, at least a portion of the component is not simultaneously subjected to resistance from the cavity's inner wall. In this application, when the center rod is installed on the fixing ring, at least portions of the first and second sidewalls on either side of the center rod do not simultaneously engage or restrict the same position on the center rod (the same position along the axial direction of the fixing ring). In other words, while the fixing ring and center rod are generally snap-fitted, at least a portion is not. This reduces installation resistance to some extent, thereby ensuring stable installation of the center rod while lowering the installation difficulty between the center rod and the fixing ring.

[0026] For the interference fit between the first sidewall, the second sidewall and the center rod, the overall interference fit and the partial non-interference fit significantly improve the installation stability between the center rod and the fixing ring, while the installation difficulty between the center rod and the fixing ring does not increase or only increases slightly. This is significantly different from the current conventional understanding that interference fit will greatly increase the assembly difficulty between parts.

[0027] Preferably, the fastening groove is located on the outer peripheral wall of the fixing ring; the first side wall has a first protrusion protruding into the fastening groove, and the second side wall has a second protrusion protruding into the fastening groove, the first protrusion and the second protrusion forming a discontinuous snap-fit ​​fit with the center rod; along the axial direction of the fixing ring, the length of the first protrusion is L1, the length of the second protrusion is L2, and the length of the fixing ring is D.

[0028] The above technical solution, through the arrangement of the first and second protrusions, can further tighten and limit the center rod, thereby increasing the stability of the center rod installation. Furthermore, the discontinuous snap-fit ​​engagement between the first and second protrusions and the center rod can, to some extent, reduce the installation resistance when installing the center rod and the fixing ring, while ensuring stable installation of the center rod.

[0029] Preferably, along the axial direction of the fixing ring, the lengths of the first protrusion, the second protrusion, and the fixing ring satisfy the following relationship: 1 / 4D < (L1 + L2) < 2D.

[0030] Through the above technical solution, the sum of the lengths of the first and second protrusions (L1+L2) is less than twice the length of the fixing ring (2D). This indicates that when the center rod is installed into the fastening groove, at least a portion of both sides of the center rod does not simultaneously contact the first and second protrusions, thus ensuring that the fixing ring (fastening groove) is discontinuous. At the same time, reasonably setting the lengths of the first and second protrusions and the fixing ring ensures both high stability of the installation of the center rod and the fixing ring, and low assembly difficulty between the center rod and the fixing ring.

[0031] The sum of the lengths of the first and second protrusions should not be too large (≥2D). If the sum of the lengths of the first and second protrusions is too large, it indicates that during the installation of the center rod and the fixing ring, the area on both sides of the center rod simultaneously subjected to the resistance of the first sidewall (first protrusion) and the second sidewall (second protrusion) is relatively large, and the assembly between the center rod and the fixing ring is relatively difficult. The sum of the lengths of the first and second protrusions should not be too small (≤1 / 4D). If the sum of the lengths of the first and second protrusions is too small, it indicates that during the installation of the center rod and the fixing ring, the area on both sides of the center rod subjected to the clamping force of the first sidewall (first protrusion) and the second sidewall (second protrusion) is relatively small, and the assembly stability between the center rod and the fixing ring is relatively low.

[0032] Preferably, a first outward protrusion and a second outward protrusion are fixedly connected to both sides of the central rod, the first outward protrusion abuts against the first protrusion, and the second outward protrusion abuts against the second protrusion; along the axial direction of the central rod, the total length of the area where the first outward protrusion abuts against the first protrusion is L3, and the total length of the area where the second outward protrusion abuts against the second protrusion is L4. The lengths of the first protrusion and the second protrusion, the total length of the area where the first outward protrusion abuts against the first protrusion, and the total length of the area where the second outward protrusion abuts against the second protrusion satisfy the following relationship: (L3+L4)<(L1+L2).

[0033] Through the above technical solution, in which the sum of the lengths of the first protrusion and the second protrusion (L1+L2) is greater than the sum of the lengths of the first external protrusion and the second external protrusion (L3+L4), it is understood that when the center rod is installed into the fastening groove, at least a portion of the first external protrusion and the second external protrusion on both sides of the center rod does not simultaneously contact the first sidewall (first protrusion) and the second sidewall (second protrusion), thus ensuring that the center rod is discontinuous. It is understandable that when the center rod is discontinuous, the fixing ring (fastening groove) can be continuous or discontinuous.

[0034] Preferably, the central rod is provided with an anti-detachment structure to prevent the central rod from separating from the fixing ring.

[0035] The above technical solution provides an anti-detachment structure to prevent the center rod from separating from the fixing ring. This anti-detachment structure further increases the stability of the installation between the center rod and the fixing ring.

[0036] Preferably, the anti-detachment structure includes: a first anti-detachment block, fixedly connected to one side of the central rod, the first anti-detachment block and the side wall of the central rod forming a first anti-detachment groove; a second anti-detachment block, fixedly connected to the other side of the central rod, the second anti-detachment block and the side wall of the central rod forming a second anti-detachment groove; the first protrusion engaging with the first anti-detachment groove, and the second protrusion engaging with the second anti-detachment groove.

[0037] With the above technical solution, after the center rod is installed, the first protrusion can be inserted into the first anti-detachment groove, and the second protrusion can be inserted into the second anti-detachment groove, thereby preventing the center rod from detaching along the radial direction of the center guide tube.

[0038] Preferably, the fastening groove is located on the central rod, and a fastening block is fixedly connected to the outer peripheral wall of the fixing ring; the first side wall has a first protrusion protruding into the fastening groove, and the second side wall has a second protrusion protruding into the fastening groove; the first protrusion and the second protrusion form a discontinuous snap-fit ​​fit to the fastening block; the length of the fastening block is d along the axial direction of the fixing ring.

[0039] With the above technical solution, the fastening groove is located on the central rod. By cooperating with the fastening block set on the outer peripheral wall of the fixing ring and the fastening groove formed on the central rod, the stable installation of the fixing ring and the central rod can be achieved. Moreover, the first protrusion and the second protrusion form a discontinuous snap-fit ​​engagement with the fastening block, so that during the installation process, there is a section on the fastening block along the axial direction of the central guide tube that does not simultaneously abut with the first protrusion and the second protrusion, which facilitates the mutual installation of the central rod and the fixing ring.

[0040] Preferably, along the length of the central rod or along the axial direction of the fastening block, the total length of the area where the first protrusion abuts against the fastening block is L5, and the total length of the area where the second protrusion abuts against the fastening block is L6; the total length of the area where the first protrusion abuts against the fastening block, the total length of the area where the second protrusion abuts against the fastening block, and the length of the fastening block satisfy the following relationship: 1 / 4d < (L5 + L6) < 2d.

[0041] By rationally setting the length of the contact area between the first protrusion and the fastening block, the length of the contact area between the second protrusion and the fastener, and the size of the fastening block, it is possible to ensure that during the installation of the center rod and the fixing ring, the first protrusion and the second protrusion are at least partially in contact with the same area (the same axial segment) of the fastening block simultaneously, thereby ensuring the stability of the center rod installation. At the same time, it also ensures that the fastening block has areas that are not simultaneously in contact with the same area (the same axial segment) of the center rod, thus facilitating the assembly of the center rod and the fixing ring.

[0042] Preferably, the guide plate is provided with a fixing structure, which is used to prevent the guide plate from detaching from the gap between two adjacent center rods.

[0043] The above technical solution, through the setting of a fixed structure, can effectively ensure the stability of the guide plate installation, thereby improving its support effect on the filter membrane and preventing it from collapsing or moving due to filtrate scouring, which is conducive to improving the filtration efficiency of the entire filter.

[0044] Preferably, the fixing structure includes fixing blocks fixedly connected to both sides of the guide plate, the fixing blocks engaging with the side wall of the central rod; or, the fixing blocks engaging with the fixing ring.

[0045] Through the above technical solution, firstly, when the guide plate is inserted into the gap between adjacent center rods, both sides of the guide plate are simultaneously clamped and limited by the side walls of the center rods, which significantly improves the stability of the guide plate installation. Furthermore, fixing blocks are provided on both sides of the guide plate, and these fixing blocks engage with the side walls of the center rods. Under the aforementioned "double" limiting effect, the installation stability between the guide plate and the center rod is ensured as much as possible, that is, the installation stability between the guide plate and the center guide tube is further guaranteed. The more stable the installation between the guide plate and the center guide tube, the greater and faster the guide plate can withstand the impact of the liquid feed, thereby ensuring the overall high filtration efficiency of the filter. At the same time, the fixing blocks can also position the guide plate during installation, facilitating precise installation of the guide plate, which further reduces the installation cost of the diaphragm retainer.

[0046] Preferably, the fixing structure further includes limiting blocks fixedly connected to both sides of the guide plate; along the radial direction of the central guide tube, the limiting blocks are located radially outside the fixing blocks; the fixing blocks and the limiting blocks cooperate to form a clamping effect on the central rod.

[0047] Through the above technical solution, under the premise of "double" limiting by the guide plate and the central rod, the use of the fixing block and the limiting block to clamp the central rod forms a "triple" limiting, which further ensures the installation stability between the guide plate and the central rod. The central rod is also stably connected to the fixing ring. Therefore, the entire diaphragm retainer (including the guide plate, central rod, and fixing ring) possesses extremely high stability. The highly stable diaphragm retainer is more impact-resistant. During use, the overall flow rate of the filtrate can be appropriately increased, further improving the flow guiding efficiency of the filter element and the filtration efficiency of the filter. Furthermore, when the filtrate flow rate is high, filtrate residue can be avoided. At the same time, the limiting block will inevitably protrude from the guide plate, which has flow guiding grooves. The fixing block protruding from the guide plate can support the flow channel, preventing filtrate from stagnating in the area between two adjacent flow guiding grooves (i.e., the area used to support the filter membrane). Instead, it allows as much filtrate as possible to flow out of the flow guiding grooves, further improving the filtration effect of the filter.

[0048] Preferably, the number of limiting blocks is greater than the number of fixing blocks.

[0049] By rationally setting the number of fixed blocks and limiting blocks through the above technical solution, the assembly of the guide plate and the center rod can be facilitated while ensuring the stability of the guide plate, so that the filter has the advantages of high filtration efficiency, high stability and low installation difficulty.

[0050] A filter includes the diaphragm retainer described above, the diaphragm retainer being installed within the housing for supporting the filter membrane and guiding the flow of filtrate.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] 1. The diaphragm retainer is assembled from fragmented fixing rings, central rods and guide plates, which greatly reduces the manufacturing and transportation costs of the diaphragm retainer;

[0053] 2. The guide plate is inserted into the gap between two adjacent center rods. On the one hand, the two adjacent center rods form a limiting clamp on the guide plate, ensuring the stability of the guide plate installation, so that the guide plate can withstand larger and faster liquid impacts, improving the overall filtration efficiency of the filter. On the other hand, the guide plate directly guides the filtrate through the gap to the inner cavity of the central guide tube, avoiding the generation of "detour" flow path, further improving the overall filtration efficiency of the filter.

[0054] 3. The non-continuous snap-fit ​​connection between the center rod and the fixed ring makes it easier for workers to disassemble the center rod and the fixed ring for maintenance, cleaning and replacement compared to bonding or welding. The non-continuous snap-fit ​​connection ensures both high installation stability and low assembly difficulty for the center rod and the fixed ring. Attached Figure Description

[0055] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the diaphragm retainer structure using an integrated central tube in the prior art.

[0057] Figure 2 for Figure 1 An enlarged diagram of position A in the middle.

[0058] Figure 3 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0059] Figure 4 for Figure 3 An enlarged view of position B in the middle.

[0060] Figure 5 for Figure 3 A schematic diagram showing the connection between one of the connecting rods and several fixed rings.

[0061] Figure 6 for Figure 5 A schematic diagram of the structure of the fixed ring.

[0062] Figure 7 for Figure 3 A schematic diagram showing the connection between one of the fastening grooves of the middle fixing ring and the connecting rod.

[0063] Figure 8 for Figure 3 A schematic diagram of the structure after removing the deflector from another perspective.

[0064] Figure 9 for Figure 8 An enlarged diagram of position C in the middle.

[0065] Figure 10 for Figure 3 A cross-sectional diagram from another perspective.

[0066] Figure 11 for Figure 10 An enlarged diagram of position D in the middle.

[0067] Figure 12 for Figure 10 A schematic diagram of the structure of the central guide vane.

[0068] Figure 13 for Figure 12 An enlarged diagram of position E in the middle.

[0069] Figure 14 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0070] Figure 15 This is a schematic diagram of the structure of the third embodiment of the present invention.

[0071] Figure 16 for Figure 15 An enlarged diagram of position F in the middle.

[0072] Figure 17 for Figure 15 A schematic diagram showing the connection between one of the fastening grooves of the fixing ring and the connecting rod.

[0073] Figure 18 This is a schematic diagram of the structure of the fourth embodiment of the present invention.

[0074] Explanation of reference numerals in the attached figures:

[0075] 100. Outer shell; 1. Central conduit; 11. Fixing ring; 111. Outer peripheral wall; 112. Protruding ridge; 12. Central rod; 121. Side wall of central rod; 13. Inner cavity of the tube; 14. Gap; 2. Guide plate; 21. Guide groove; 22. Connecting section; 3. Fastening structure; 31. Fastening groove; 311. First side wall; 3111. First extension wall; 3112. First protrusion; 312. Second side wall; 3121. Second extension wall; 3122. Second protrusion; 32. Fastening block; 4. Anti-detachment structure; 41. First anti-detachment block; 42. Second anti-detachment block; 43. First anti-detachment groove; 44. Second anti-detachment groove; 5. Fixing structure; 51. Limiting block; 52. Fixing block; 6. First external protrusion; 7. Second external protrusion. Detailed Implementation

[0076] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0077] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0078] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0079] The diaphragm retainer of the filter typically includes a central conduit 1 and guide plates 2. The guide plates are arranged sequentially along the circumferential direction of the outer wall of the central conduit 1 and are fixedly connected to the outer wall of the central conduit 1. Adjacent guide plates 2 are separated from the outer wall of the central conduit 1 by surrounding a compartment that accommodates the filter membrane.

[0080] The central catheter 1 can be configured in various ways; the two most commonly used types are the integrated structure and the assembled structure. See [link to relevant documentation]. Figure 1 and Figure 2 The common one-piece structure has high manufacturing and transportation costs. Furthermore, during use, the filtrate flows along the path shown in Z1 on the outer wall of the central tube, increasing the flow path and reducing the filter's efficiency. In contrast, the common assembled structure is prone to collapse or movement of the central conduit 1 when subjected to fluid erosion, leading to filtrate retention and affecting filtration efficiency (not shown in the figure).

[0081] Example 1

[0082] See Figures 3 to 13 To address the shortcomings of existing diaphragm retainers, this invention provides a diaphragm retainer comprising a central conduit 1 and a guide plate 2. The central conduit 1 includes a fixing ring 11 and a plurality of central rods 12. The fixing ring 11 is used to restrain the central rods 12, and the central rods 12 are arranged circumferentially around the fixing ring 11 and surround the inner cavity 13 forming the central conduit 1. A gap 14 communicating with the inner cavity 13 is also formed between adjacent central rods 12.

[0083] Specifically, see Figures 3 to 5 The fixing ring 11, the central rod 12, and the guide plate 2 are arranged separately. When manufacturing and transporting the fixing ring 11, the central rod 12, and the guide plate 2 of the central conduit 1, the transportation cost of the diaphragm retainer and the manufacturing cost of the central conduit 1 can be reduced. When the diaphragm retainer is in the assembled state, the guide plate 2 is inserted into the gap 14, and the adjacent central rod 12 forms a clamping effect on the guide plate 2. Along the circumferential direction of the central conduit 1, the adjacent guide plates 2 and the central rod 12 form a compartment around which the filter membrane is accommodated, and the central rod 12 is bound by the fixing ring 11, thereby increasing the stability of the connection between the fixing ring 11 and the central rod 12. The central rod 12 bound by the fixing ring 11 can also clamp the guide plate 2, so that the central rod 12 presses against the guide plate 2 from both sides, thereby increasing the stability of the installation of the guide plate 2. The solution in this embodiment can reduce the manufacturing and transportation costs of the diaphragm retainer, while ensuring the overall stability of the central conduit 1 in the assembled state, and preventing the assembled diaphragm retainer from collapsing or loosening due to fluid erosion during use. After the filter membrane (hollow fiber membrane) is placed in the compartment, baskets, strips, mesh, etc. (not shown) can be arranged at certain intervals on the outer edge of the guide plate 2 (the end of the guide plate 2 away from the fixing ring 11). The sealing elements are used to seal the membrane bundle in the compartment.

[0084] Furthermore, when the diaphragm retainer is used in the filter, and the filter is used for filtration, the filtrate filtered through the filtration membrane enters the compartment and, guided by the guide plate 2, enters the slit 14. It then directly enters the inner cavity 13 of the central conduit 1 through the slit 14, reducing the flow path of the filtrate and preventing a more "winding" flow path within the compartment (i.e., see [reference]). Figure 2 Only after following the Z1 path shown can the filter enter the inner cavity 13 of the central conduit 1, thus improving the filtration efficiency of the filter.

[0085] Furthermore, in order to achieve stable installation of the central rod 12, in this embodiment, four fixing rings 11 are provided. Of course, in other embodiments, the fixing rings 11 can also be one, two or more, depending on the axial length of the central guide tube 1.

[0086] It is worth noting that the "restraint" referred to in this application means that the fixing ring 11 and the center rod 12 can be connected relative to each other, thereby preventing the center rod 12 from detaching from the fixing ring 11. The relative connection between the fixing ring 11 and the center rod 12 can be configured in various ways to achieve stable installation of both and form a gap 14 for inserting the guide plate 2 and the inner cavity 13 of the central guide tube 1 for guiding the flow.

[0087] See Figures 5 to 7In order to achieve a stable connection between the central conduit 1 and the fixing ring 11, the central conduit 1 also includes a fastening structure 3, and the central rod 12 is at least partially engaged with the fixing ring 11 through the fastening structure 3.

[0088] Specifically, in this embodiment, the fastening structure 3 is configured as a fastening groove 31, which includes a first sidewall 311 and a second sidewall 312. The first sidewall 311 and the second sidewall 312 protrude from the outer peripheral wall 111 of the fixing ring 11, thereby forming the fastening groove 31, such that the fastening groove 31 is located on the outer peripheral wall 111 of the fixing ring 11. Of course, in other embodiments, the fastening groove 31 may also extend from the outer peripheral wall 111 of the fixing ring 11 to the inner cavity 13 of the tube, that is, forming an inner groove structure. When the diaphragm retainer is in the assembled state, the center rod 12 is inserted into the fastening groove 31, and the center rod 12 forms a snap-fit ​​engagement with the first sidewall 311 and the second sidewall 312. In order to facilitate the installation of the center rod 12, the center rod 12 forms a discontinuous snap-fit ​​engagement with the fixing ring 11 at least partially through the first sidewall 311 and the second sidewall 312.

[0089] Furthermore, the first sidewall 311 has a first extension wall 3111 fixedly connected to the fixing ring 11 and a first protrusion 3112 protruding toward the fastening groove 31, and the first protrusion 3112 is located at the end of the first extension wall 3111 away from the fixing ring 11; the second sidewall 312 has a second extension wall 3121 fixedly connected to the fixing ring 11 and a second protrusion 3122 protruding toward the fastening groove 31, and the second protrusion 3122 is located at the end of the second extension wall 3121 away from the fixing ring 11. Through the first protrusion 3112 and the second protrusion 3122, the center rod 12 at least partially forms a discontinuous snap-fit ​​engagement with the fixing ring 11.

[0090] In addition, see Figure 6 and Figure 7 Taking the fit between the first protrusion 3112, the second protrusion 3122, and the center rod 12 as an example, the "discontinuous snap-fit ​​fit" in this application refers to the fit along the length direction perpendicular to the center rod 12. Figure 7 In the Z2 direction (as shown), the projections of the first protrusion 3112 and the second protrusion 3122 have non-overlapping areas.

[0091] It can be seen that during the assembly of the fixing ring 11 and the center rod, when both sides of the same area (the same position on the axis) of the center rod 12 simultaneously contact the first protrusion 3112 and the second protrusion 3122, the two sides of the center rod 12 are respectively subjected to the force of the first protrusion 3112 and the force of the second protrusion 3122, and the directions of the forces are opposite, which helps to maintain the stability of the center rod 12. When the two sides of the same area (the same position on the axis) of the center rod 12 do not simultaneously contact the first protrusion 3112 and the second protrusion 3122, the resistance to the relative sliding of the center rod 12 and the fixing ring 11 is small, which facilitates the installation of the center rod 12 and the fixing ring 11.

[0092] To ensure the stability of the installation of the center rod 12 and the fixing ring 11 while reducing the assembly difficulty, in this embodiment, along the axial direction of the fixing ring 11, the length of the first protrusion 3112 is L1, the length of the second protrusion 3122 is L2, and the length of the fixing ring 11 is D. Along the axial direction of the fixing ring 11, the lengths of the first protrusion 3112, the second protrusion 3122, and the fixing ring 11 satisfy the following relationship: 1 / 4D <

[0093] (L1+L2)<2D. By reasonably setting the dimensions of the first protrusion 3112, the second protrusion 3122, and the fixing ring 11, it is possible to ensure that during the installation of the center rod 12 and the fixing ring 11, the first protrusion 3112 and the second protrusion 3122 are at least partially in contact with the same area (the same position in the axial direction) of the center rod 12 at the same time. This ensures the stability of the installation of the center rod 12. At the same time, it also ensures that there are areas in the same area (the same position in the axial direction) of the center rod 12 that are not in contact with the first protrusion 3112 and the second protrusion 3122 at the same time, which facilitates the assembly of the center rod 12 and the fixing ring 11. Furthermore, when the dimensions of the first protrusion 3112 and the second protrusion 3122 are close to the defined lower limit, the area where the first protrusion 3112 and the second protrusion 3122 simultaneously contact the same region (the same position in the axial direction) of the central rod 12 during installation is smaller, which is more conducive to installation. When the dimensions of the first protrusion 3112 and the second protrusion 3122 are close to the defined upper limit, the area where the first protrusion 3112 and the second protrusion 3122 simultaneously contact the same region (the same position in the axial direction) of the central rod 12 during installation is larger, which is more conducive to ensuring the stability of the central rod 12. In other embodiments, the first sidewall 311 and the second sidewall 312 can also be configured with other structures, which can enable the central rod 12 to at least partially form a discontinuous snap-fit ​​engagement with the fixing ring 11 through the first sidewall 311 and the second sidewall 312.

[0094] Furthermore, preferably, the center rod 12 is interference-fitted with the first protrusion 3112 and the second protrusion 3122. This allows the center rod 12 to be installed in the fixing ring 11, so that its left and right sides are subjected to the forces of the first protrusion 3112 and the second protrusion 3122. The forces exerted by the first protrusion 3112 on the center rod are opposite in direction to those exerted by the second protrusion 3122 on the center rod 12. This prevents the center rod 12 from always maintaining a radial installation along the central guide tube 1, preventing the center rod 12 from shaking in both directions and causing it to tilt or deflect in the fastening groove 31. This increases the stability of the center rod 12 installation and further maintains the stability of the gap 14 between two adjacent center rods 12. At the same time, to facilitate the installation of the center rod 12, there are gaps (i.e., no contact) between the two sides of the center rod 12 and the first extension wall 3111 and the second extension wall 3121. This reduces the resistance encountered by the center rod 12 during installation and lowers the installation difficulty. Of course, in other embodiments, the first protrusion 3112 and the second protrusion 3122 may not be provided. In this case, the first extension wall 3111, the second extension wall 3121 and the center rod 12 form an interference fit.

[0095] Of course, in other embodiments, after the fixing ring 11 and the center rod 12 are assembled, the center rod 12 and the fixing ring 11 can be fixedly connected by welding to achieve the binding of the center rod 12 by the fixing ring 11; when the fastening structure 3 is provided, the fastening structure 3 can be set as fastening groove 31 or other locking structures.

[0096] See Figure 8 and Figure 9 In this embodiment, in order to further increase the stability of the installation between the center rod 12 and the fixing ring 11, an anti-detachment structure 4 is provided on the center rod 12 to prevent the center rod 12 from detaching from the fixing ring 11.

[0097] Specifically, the anti-detachment structure 4 includes a first anti-detachment block 41 and a second anti-detachment block 42. The first anti-detachment block 41 is fixedly connected to one side of the central rod 12 and forms a first anti-detachment groove 43 around the central rod sidewall 121 of the central rod 12. The second anti-detachment block 42 is fixedly connected to the other side of the central rod 12 and forms a second anti-detachment groove 44 around the other sidewall 121 of the central rod 12. A first protrusion 3112 engages with the first anti-detachment groove 43, and a second protrusion 3122 engages with the second anti-detachment groove 44. After the central rod 12 is installed, the first protrusion 3112 can be engaged in the first anti-detachment groove 43, and the second protrusion 3122 can be engaged in the second anti-detachment groove 44. This allows the first anti-detachment block 41 and the second anti-detachment block 42 to press against the central rod 12 radially upwards, further increasing the stability of the central rod 12 installation and preventing the central rod 12 from detaching radially along the fixing ring 11.

[0098] Furthermore, a protruding ridge 112 or a protrusion can be provided on the outer peripheral wall 111 of the fixing ring 11 (located in the area at the bottom of the fastening groove 31). The protruding ridge 112 can apply a thrust away from the center of the fixing ring 11 to the center rod 12 along the radial direction of the fixing ring 11, thereby enabling the protruding ridge 112 to cooperate with the first protrusion 3112, the second protrusion 3122, and the anti-detachment structure 4 to achieve radial locking of the center rod, preventing the center rod 12 from moving or vibrating radially along the fixing ring 11, and further increasing the stability of the center rod 12 installation. In addition, the presence of the protruding ridge 112 can support the center rod 12, thereby reducing the contact area between the center rod 12 and the outer peripheral wall 111 of the fixing ring 11, reducing the resistance during the installation process of the center rod 12 and the fixing ring 11, and facilitating the installation of both.

[0099] See Figures 9 to 13 In order to increase the stability of the guide plate 2 and thus improve the support effect of the guide plate 2 on the filter membrane, and prevent it from collapsing or moving due to the filtrate scouring, in this embodiment, the guide plate 2 is provided with a fixing structure 5. The fixing structure 5 is used to prevent the guide plate 2 from detaching from the gap 14 between the two adjacent center rods 12.

[0100] The fixing structure 5 includes a limiting block 51 and a fixing block 52 fixedly connected to both sides of the guide plate 2. Along the radial direction of the central conduit 1, the limiting block 51 is located radially outside the fixing block 52. When the guide plate 2 is installed, firstly, the fixing block 52 engages with the central rod sidewall 121 of the central rod 12. Of course, in other embodiments, the fixing block 52 can also engage with the fixing ring 11. Secondly, the limiting block 51 and the fixing block 52 cooperate to form a clamping effect on the central rod 12, thereby achieving a stable connection between the central rod 12 and the guide plate 2. The highly stable diaphragm retainer is more impact-resistant. During use, it can appropriately increase the overall flow rate of the filtrate, further improving the flow efficiency of the filter element and the filtration efficiency of the filter. Moreover, when the filtrate flow rate is high, it can also prevent filtrate residue.

[0101] In this embodiment, one side of the guide plate 2 is described. The guide plate 2 includes a guide channel 21 and a connecting section 22 connecting the side wall of the guide channel 21. The connecting section 22 is used to support the filter membrane. The filtrate after filtration by the filter membrane flows through the connecting section 22 to the guide channels 21 on both sides. The limiting block 51 is fixed on the connecting section 22 and protrudes from the connecting section 22, so that the limiting block 51 protruding from the connecting section 22 can play the role of supporting the flow channel, that is, it can increase the gap between the connecting section 22, the guide channel 21 and the filter membrane, thereby preventing the filtrate from being stuck in the area between two adjacent guide channels 21 (i.e., the connecting section 22), but allowing it to flow out of the guide channel 21 as much as possible, further improving the filtration effect of the filter. In addition, the snap-fit ​​between the limiting block 51 and the center rod 12 or the fixing ring 11 can increase the stability of the installation of the guide plate 2, the center rod 12 and the fixing ring 11. At the same time, the limiting block 51 can also position the guide plate 2 during installation, which facilitates the precise installation of the guide plate 2.

[0102] Furthermore, in order to ensure the stability of the guide plate 2 while facilitating the assembly of the guide plate 2 and the center rod 12, so that the filter has the advantages of high filtration efficiency, high stability and low installation difficulty, in this embodiment, the number of limiting blocks 51 is greater than the number of fixing blocks 52. This can not only achieve the clamping and cooperation of the guide plate 2 and the center rod 12, but also facilitate the assembly of the two.

[0103] Example 2

[0104] See Figure 14 Based on the above embodiment one, the difference in this embodiment is that: in this embodiment, a first outward protrusion 6 and a second outward protrusion 7 are fixedly connected to both sides of the central rod 12, respectively. The first outward protrusion 6 abuts against the first protrusion 3112, and the second outward protrusion 7 abuts against the second protrusion 3122. Along the length direction of the central rod 12, the total length of the abutting area of ​​the first outward protrusion 6 and the first protrusion 3112 is L3, and the total length of the abutting area of ​​the second outward protrusion 7 and the second protrusion 3122 is L4. Moreover, the lengths of the first protrusion 3112 and the second protrusion 3122, the total length of the abutting area of ​​the first outward protrusion 6 and the first protrusion 3112, and the total length of the abutting area of ​​the second outward protrusion 7 and the second protrusion 3122 satisfy the following relationship: (L3+L4)<(L1+L2).

[0105] Example 3

[0106] See Figures 15 to 17Based on the above embodiment one, the difference in this embodiment is that: the fastening groove 31 is located on the central rod 12, and the outer peripheral wall 111 of the fixing ring 11 is fixedly connected to the fastening block 32; the first side wall 311 has a first protrusion 3112 protruding towards the inside of the fastening groove 31, and the second side wall 312 has a second protrusion 3122 protruding towards the inside of the fastening groove 31; the first protrusion 3112 and the second protrusion 3122 form a discontinuous snap-fit ​​engagement with the fastening block 32.

[0107] Specifically, see Figure 17 Along the axial direction of the fixing ring 11, the length of the fastening block 32 is d. Along the length direction of the central rod 12 or along the axial direction of the fastening block 32, the total length of the area where the first protrusion 3112 and the fastening block 32 abut against each other is L5, and the total length of the area where the second protrusion 3122 and the fastening block 32 abut against each other is L6. The total length of the area where the first protrusion 3112 and the fastening block 32 abut against each other, the total length of the area where the second protrusion 3122 and the fastening block 32 abut against each other, and the length of the fastening block 32 satisfy the following relationship: 1 / 4d < (L5 + L6) < 2d. By reasonably setting the length of the contact area between the first protrusion 3112 and the fastening block 32, the length of the contact area between the second protrusion 3122 and the fastener, and the size of the fastening block 32, it is possible to ensure that during the installation of the center rod 12 and the fixing ring 11, the first protrusion 3112 and the second protrusion 3122 are at least partially in contact with the same area (the same axial segment) of the fastening block 32 at the same time. This ensures the stability of the installation of the center rod 12. At the same time, it also ensures that the fastening block 32 has areas that are not in contact with the same area (the same axial segment) of the center rod 12 at the same time, which facilitates the assembly of the center rod 12 and the fixing ring 11.

[0108] Example 4

[0109] See Figure 18 Based on the diaphragm retainer of the above embodiments, this embodiment provides a filter including the diaphragm retainer described above. The diaphragm retainer is installed inside the housing 100 and is used to support the filter membrane and guide the flow of filtrate.

[0110] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A diaphragm retainer, comprising a central conduit and a flow guide plate, characterized in that, The central catheter includes: retaining ring; A plurality of central rods are arranged at intervals around the fixing ring, the fixing ring being used to restrain the central rods, and each central rod passes around the inner lumen forming the central conduit; A gap is formed between two adjacent central rods, which communicates with the inner cavity of the tube and allows the guide plate to be inserted. The adjacent central rods form a clamping mechanism for the guide plate. Along the circumferential direction of the central conduit, adjacent guide plates and the central rod surround a compartment that accommodates a filter membrane. The guide plates guide the filtrate in the compartment to the slit and through the slit to the inner lumen of the central conduit.

2. A diaphragm holder according to claim 1, characterized in that The central conduit also includes a fastening structure, through which the central rod is at least partially engaged with the fixing ring.

3. A diaphragm holder according to claim 2, wherein The fastening structure is a fastening groove, which includes a first sidewall and a second sidewall. Through the first and second sidewalls, the central rod and the fixing ring form a discontinuous snap-fit ​​engagement.

4. A diaphragm holder according to claim 3, wherein The fastening groove is located on the outer peripheral wall of the fixing ring; The first sidewall has a first protrusion protruding into the fastening groove, and the second sidewall has a second protrusion protruding into the fastening groove. The first protrusion and the second protrusion form a discontinuous snap-fit ​​engagement with the center rod. Along the axial direction of the fixing ring, the length of the first protrusion is L1, the length of the second protrusion is L2, and the length of the fixing ring is D.

5. A diaphragm holder according to claim 4, wherein Along the axial direction of the fixing ring, the lengths of the first protrusion, the second protrusion, and the fixing ring satisfy the following relationship: 1 / 4D < (L1 + L2) < 2D.

6. A diaphragm holder according to claim 4, wherein The central rod is fixedly connected to a first outward protrusion and a second outward protrusion on both sides, the first outward protrusion abutting against the first protrusion, and the second outward protrusion abutting against the second protrusion. Along the axial direction of the central rod, the total length of the area where the first protrusion abuts against the first protrusion is L3, and the total length of the area where the second protrusion abuts against the second protrusion is L4. The lengths of the first protrusion and the second protrusion, the total length of the area where the first protrusion abuts against the first protrusion, and the total length of the area where the second protrusion abuts against the second protrusion satisfy the following relationship: (L3+L4)<(L1+L2).

7. A diaphragm holder according to any one of claims 4-6, characterised in that The central rod is provided with an anti-detachment structure to prevent the central rod from separating from the fixing ring.

8. A diaphragm retainer according to claim 7, characterized in that, The anti-detachment structure includes: The first anti-detachment block is fixedly connected to one side of the central rod, and the first anti-detachment block and the side wall of the central rod surround to form a first anti-detachment groove; The second anti-detachment block is fixedly connected to the other side of the central rod, and the second anti-detachment block and the side wall of the central rod surround to form a second anti-detachment groove; The first protrusion engages with the first anti-detachment slot, and the second protrusion engages with the second anti-detachment slot.

9. A diaphragm retainer according to claim 3, characterized in that, The fastening groove is located on the central rod, and a fastening block is fixedly connected to the outer peripheral wall of the fixing ring; The first sidewall has a first protrusion protruding into the fastening groove, and the second sidewall has a second protrusion protruding into the fastening groove; The first protrusion and the second protrusion form a discontinuous snap-fit ​​engagement with the fastening block; The length of the fastening block is d along the axial direction of the fixed ring.

10. A diaphragm retainer according to claim 9, characterized in that, Along the length of the central rod, or along the axial direction of the fastening block, the total length of the area where the first protrusion abuts against the fastening block is L5, and the total length of the area where the second protrusion abuts against the fastening block is L6; the total length of the area where the first protrusion abuts against the fastening block, the total length of the area where the second protrusion abuts against the fastening block, and the length of the fastening block satisfy the following relationship: 1 / 4d < (L5 + L6) < 2d.

11. A diaphragm retainer according to any one of claims 1-3, wherein the guide plate is provided with a fixing structure, the fixing structure being used to prevent the guide plate from detaching from the gap between two adjacent center rods.

12. A diaphragm retainer according to claim 11, characterized in that, The fixing structure includes fixing blocks fixedly connected to both sides of the guide plate, and the fixing blocks are engaged with the side wall of the central rod; or; The fixing block engages with the fixing ring.

13. A diaphragm retainer according to claim 12, characterized in that, The fixing structure also includes limiting blocks fixedly connected to both sides of the guide plate; Along the radial direction of the central conduit, the limiting block is located radially outside the fixing block; The fixing block and the limiting block cooperate to clamp the center rod.

14. A diaphragm retainer according to claim 13, characterized in that, The number of limiting blocks is greater than the number of fixing blocks.

15. A filter comprising a housing, a filter membrane, and a diaphragm retainer as described in any one of claims 1 to 14, the diaphragm retainer being mounted within the housing for supporting the filter membrane and guiding the flow of filtrate.

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