Filter screen inner and outer support and manufacturing method thereof, filter element and screen filter

Abstract

The application discloses an inner and outer support of filter screen, a manufacturing method thereof, a filter element and a screen filter, and relates to the technical field of screen filters. The inner and outer support of filter screen is used for supporting the filter screen. The filter screen has a plurality of V-shaped grooves which are continuously distributed in the circumferential direction. The inner and outer support of filter screen comprises a plurality of rib plates and support plates. Each rib plate is arranged in parallel to the axial direction of the filter screen. Each rib plate is arranged in a corresponding V-shaped groove. One end of the rib plate abuts against the bottom of the V-shaped groove. A plurality of support plates are fixedly arranged on both sides of each rib plate. The plane of the support plate intersects with the plane of the rib plate. One end of each support plate is fixedly connected to the rib plate, and the other end abuts against the side wall of the V-shaped groove. The application can stabilize the filtration flux and prolong the continuous operation time of the filter element.

Description

Technical Field

[0001] This invention relates to the field of mesh filter technology, and in particular to an inner and outer support for a filter screen, a method for manufacturing the same, a filter element, and a mesh filter. Background Technology

[0002] In agricultural irrigation, mesh filters are key equipment for ensuring the stable operation of drip and sprinkler irrigation systems. The performance of their filter cartridges directly affects filtration efficiency, system energy consumption, and maintenance costs. Currently, most mesh filter cartridges use a cylindrical, single-layer mesh structure. Their filtration area is strictly limited by their external dimensions, resulting in a relatively small effective filtration area per unit volume. Under high flow conditions, high-speed scouring and impurity accumulation can easily occur in certain areas of the filter cartridge, leading to increased flow resistance, decreased water output, and the need for frequent disassembly and cleaning, severely impacting irrigation continuity. Especially during peak irrigation seasons, when the water contains high levels of silt, weeds, and other impurities, the filtration capacity of a single-layer mesh structure is insufficient to meet actual needs, easily causing dripper clogging and increasing maintenance costs.

[0003] To address the issue of insufficient filtration area, some technical solutions have proposed folded filter screen structures. For example, Chinese patent CN107080995B discloses a self-cleaning irrigation filter element, which folds a filter screen between an inner and outer filter screen fixing device, increasing the water passage area by changing the cylindrical horizontal cross-section of the screen to a multi-folded shape. However, this design relies solely on the end fixing devices for constraint, lacking independent radial support for each fold of the filter screen body. Under high operating pressure, the filter screen is prone to bulging and deformation, leading to changes in the geometry of the folds, instability in the flow channel cross-section, and consequently, a decrease in filtration flux and filtration accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide an inner and outer support for a filter screen and its manufacturing method, a filter element, and a mesh filter, so as to solve the problems existing in the prior art, stabilize the filtration throughput, and extend the continuous operation time of the filter element.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides an inner and outer support for a filter screen, the filter screen having multiple V-shaped grooves continuously distributed circumferentially, including: multiple ribs and support plates; each rib is arranged parallel to the axial direction of the filter screen, each rib is respectively disposed in one of the V-shaped grooves, and one end of each rib abuts against the bottom of the V-shaped groove; multiple support plates are fixedly disposed on both sides of each rib, the plane of the support plate intersects the plane of the rib, one end of each support plate is fixedly connected to the rib, and the other end abuts against the side wall of the V-shaped groove.

[0006] Preferably, the end face of the rib that abuts against the bottom of the V-groove is an arc-shaped abutment surface that matches the curvature of the bottom of the V-groove.

[0007] Preferably, the plane containing the support plate is orthogonal to the plane containing the rib plate.

[0008] Preferably, the support plates on the inner and outer supports of the filter screen are positioned opposite each other.

[0009] Preferably, the ribs are equidistantly distributed along the circumference of the filter screen, and the number of the ribs corresponds one-to-one with the number of the V-shaped grooves.

[0010] The present invention also provides a method for manufacturing the inner and outer supports of the filter screen as described above, comprising the following steps: Step 1: Provide a planar injection mold and prepare a planar grating plate through an integrated injection molding process. The planar grating plate includes multiple parallel ribs and multiple support plates fixedly disposed on both sides of each rib. One end of each support plate is fixedly connected to the rib, and a water passage gap is formed between two adjacent support plates. Step 2: The planar grid plate is rolled and bent along the extension direction of the rib plate to form a cylindrical structure that matches the arc contour of the filter screen.

[0011] The present invention also provides a mesh filter element, comprising: A filter screen having a plurality of V-shaped grooves continuously distributed circumferentially; The filter inner support as described above is disposed inside the filter. The ribs of the filter inner support are respectively embedded in the V-shaped grooves of the filter, and one end of the rib abuts against the bottom of the V-shaped groove. The support plates on both sides of the rib abut against the two side walls of the V-shaped groove. As described above, the filter screen outer support is disposed outside the filter screen. The ribs of the filter screen outer support are respectively embedded in the V-shaped groove of the filter screen, and one end of the rib abuts against the bottom of the V-shaped groove. The support plates on both sides of the rib abut against the two side walls of the V-shaped groove.

[0012] Preferably, the filter screen has 36 folds around its circumference, forming 36 V-shaped grooves on both the outer and inner sides of the filter screen.

[0013] The present invention also provides a mesh filter, comprising: a housing and a mesh filter element as described above, wherein the filter element is disposed within the housing, and the housing is provided with an inlet and an outlet.

[0014] Preferably, the housing is provided with an axially extending mounting interface, and the inner wall of the mounting interface is provided with internal threads; Multiple filter elements are provided, and the multiple filter elements are arranged sequentially along the axial direction of the housing; The bottom of the bottommost filter element is provided with a lower shell connecting sleeve. The outer wall of the lower shell connecting sleeve is provided with external threads. The lower shell connecting sleeve is detachably threadedly connected to the internal threads of the mounting interface through the external threads. The top of the topmost filter element is provided with a top cover assembly; the top cover assembly is used to seal the opening on the topmost filter element; The top cover assembly, the topmost filter element, the two adjacent filter elements, the bottommost filter element, and the lower shell connecting sleeve are all secured by clamps.

[0015] Preferably, the inner wall of the clamp is provided with an annular limiting groove, and the bottom of the limiting groove is integrally formed with an annular positioning rib, which divides the annular limiting groove into two sub-limiting grooves; after assembly, the limiting platform on the upper cover assembly and the limiting platform of the topmost filter element are respectively located in the two sub-limiting grooves of the same clamp. The limiting platforms of two adjacent filter elements are respectively located in the two sub-limiting grooves of the same clamp; The limiting platform of the bottommost filter element and the limiting platform of the lower shell connecting sleeve are respectively located in the two sub-limiting grooves of the same clamp; An annular sealing plate is provided between the top cover assembly and the topmost filter element, between two adjacent filter elements, and between the bottommost filter element and the lower shell connecting sleeve; the annular sealing plate is located inside the annular positioning rib. The filter element is provided with support cylinders at the top, bottom and middle; Each of the annular sealing plates is integrally formed with several of the support cylinders to form a central branch pipe; The structures of the multiple central branch pipes are identical.

[0016] Preferably, the clamp is a split clamp, consisting of two identical half-clamp bodies, which are integrally injection molded using the same mold. The two mating surfaces of each half-clamp body are respectively provided with mutually compatible rectangular tenon-and-groove positioning structures, with one end face having a rectangular tenon and a positioning groove, and the other end face correspondingly having a matching rectangular groove and a positioning boss. During assembly, the two half-clamp bodies are mutually engaged by the rectangular tenon and the rectangular groove to form circumferential positioning, thereby limiting the relative misalignment, deflection, and circumferential movement between the two half-clamp bodies at the mating surface; and are fixedly connected by bolts.

[0017] The present invention achieves the following technical effects compared to the prior art: In this invention, by respectively arranging each rib within each V-shaped groove of the filter screen, with one end of the rib abutting the bottom of the V-shaped groove and the support plates on both sides of the rib abutting the side walls of the V-shaped groove, the purpose of independently supporting each V-shaped groove is achieved. This structure can effectively constrain the radial displacement of each V-shaped groove under fluid pressure, preventing the bottom of the V-shaped groove from bulging outward and the side walls from bulging outward, thereby maintaining the geometric consistency of each pleat of the filter screen, ensuring a constant cross-section of the filter channel, thus stabilizing the filtration flux and extending the continuous operating time of the filter element. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A vertical sectional view of a mesh filter provided in an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A magnified view of a section at point B in the middle; Figure 4 for Figure 1 A magnified view of a section at point C; Figure 5 This is a schematic diagram of the structure of the filter screen outer support; Figure 6 for Figure 5 A magnified view of a section at point D; Figure 7 This is a schematic diagram of the filter screen structure; Figure 8 This is a schematic diagram of the internal support structure of the filter screen; Figure 9 This is a horizontal sectional view of the filter element; Figure 10 for Figure 9 A magnified view of a section at point F in the middle; Figure 11 This is a schematic diagram of the filter element structure; Figure 12 for Figure 11 A magnified view of a section at point E in the middle; Figure 13 A schematic diagram of the central branch pipe; Figure 14 This is a schematic diagram of the clamp structure; Figure 15This is a schematic diagram of the filter screen's inner and outer supports in their unfolded state. Figure 16 This is a schematic diagram of the clamping ring structure; In the diagram: 1-shell; 11-lower shell; 12-upper shell; 13-inlet; 14-outlet.

[0020] 2-Filter element; 21-Outer support for filter screen; 211-Rib plate; 212-Support plate; 213-Connecting part; 22-Filter screen; 221-V-groove; 23-Inner support for filter screen.

[0021] 3-Installation interface.

[0022] 4-Top cover assembly.

[0023] 5-Clamping hoop; 51-Rectangular tenon and mortise positioning structure; 511-Positioning groove; 512-Rectangular tenon; 52-Annular positioning rib; 53-Sub-limiting groove.

[0024] 6-Central branch pipe; 61-Annular sealing plate; 62-Support cylinder; 63-Connecting rib.

[0025] 7-Lower shell connecting sleeve.

[0026] 8-Clamping ring. Detailed Implementation

[0027] 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. 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.

[0028] The purpose of this invention is to provide an inner and outer support for a filter screen and its manufacturing method, a filter element, and a mesh filter, so as to solve the problems existing in the prior art, stabilize the filtration throughput, and extend the continuous operation time of the filter element.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The following is combined Figures 1 to 16 The following describes embodiments of the present invention.

[0031] Example 1 This invention provides an inner and outer support for a filter screen 22, such as... Figure 7 As shown, the filter screen 22 has multiple V-shaped grooves 221 continuously distributed along the circumference, such as... Figures 5-12As shown, it includes: multiple ribs 211 and support plates 212; each rib 211 is arranged parallel to the axial direction of the filter screen 22, and each rib 211 is respectively arranged in a V-shaped groove 221, with one end of the rib 211 abutting against the bottom of the V-shaped groove 221; multiple support plates 212 are fixedly arranged on both sides of each rib 211, the plane of the support plate 212 intersects the plane of the rib 211, one end of each support plate 212 is fixedly connected to the rib 211, and the other end abuts against the side wall of the V-shaped groove 221.

[0032] In this embodiment, by respectively arranging each rib 211 within each V-shaped groove 221 of the filter screen 22, with one end of the rib 211 abutting against the bottom of the V-shaped groove 221 and the support plates 212 on both sides of the rib 211 abutting against the side walls of the V-shaped groove 221, the purpose of independently supporting each V-shaped groove 221 is achieved. This structure can effectively constrain the radial displacement of each V-shaped groove 221 under fluid pressure, prevent the bottom of the V-shaped groove 221 from bulging outward and the side walls from bulging outward, thereby maintaining the geometric consistency of each pleat of the filter screen 22, ensuring a constant cross-section of the filter channel, thereby stabilizing the filtration flux and extending the continuous operating time of the filter element 2.

[0033] In some embodiments, the end face of the rib plate 211 that abuts against the bottom of the V-groove 221 is an arc-shaped abutment surface that matches the curvature of the bottom of the V-groove 221.

[0034] In this embodiment, by setting the end face of the rib 211 as an arc-shaped contact surface that matches the curvature of the bottom of the V-groove 221, the contact area between the rib 211 and the bottom of the V-groove 221 is increased, improving the contact between them from line or point contact to surface contact. Under high-pressure conditions, surface contact can effectively disperse contact stress, avoiding indentations or wear on the filter screen 22 at the bottom of the V-groove 221 due to local stress concentration. It also improves the stability and reliability of the contact, further suppressing radial displacement at the bottom of the V-groove 221.

[0035] Alternatively, the curvature of the arc-shaped contact surface is not limited to being exactly the same as the curvature of the bottom of the V-groove 221, but may be slightly smaller or slightly larger than the curvature of the bottom of the V-groove 221, as long as a surface contact or near-surface contact fit effect can be achieved; in addition, the end face of the rib plate 211 may be set as an elastic material layer or an elastic gasket may be provided, which can adapt to the curvature of the bottom of the V-groove 221 through elastic deformation, thereby further improving the fit.

[0036] In some embodiments, adjacent ribs 211 are connected in sequence, and the connection part 213 is two corresponding support plates 212 on two adjacent ribs 211. This makes the connection part 213 as small as possible and reduces the impact on water flow pressure.

[0037] In some embodiments, the support plate 212, the rib plate 211, and the connecting portion 213 are integrally formed, preferably made of plastic. This provides flexibility.

[0038] In some embodiments, the plane containing the support plate 212 is orthogonal to the plane containing the rib plate 211.

[0039] In this embodiment, when the support plate 212 and the rib plate 211 are orthogonally arranged, the support plate 212 extends along the circumferential direction of the filter screen 22 and abuts against the sidewall of the V-groove 221. This provides a supporting force perpendicular to the sidewall surface of the V-groove 221, and the direction of this force is opposite to the direction of the fluid pressure borne by the sidewall. Therefore, it can most effectively resist the outward bulging deformation of the sidewall under the action of fluid pressure. At the same time, the orthogonal structure makes the force transmission path between the support plate 212 and the rib plate 211 the shortest and the force most direct, which is beneficial to improving the rigidity of the support structure and reducing the bending deformation of the support plate 212 itself.

[0040] Of course, the angle between the plane where the support plate 212 is located and the plane where the rib plate 211 is located is not limited to orthogonal (90°), but can also be acute or obtuse, as long as one end of the support plate 212 can abut against the side wall of the V-groove 221.

[0041] In some embodiments, the support plates 212 on the inner filter support 23 and the outer filter support 21 are positioned opposite each other.

[0042] In this embodiment, when the support plates 212 on the inner support 23 and the outer support 21 of the filter screen are aligned one-to-one in the wall thickness direction of the filter screen 22, the support plates 212 on both the inner and outer sides apply clamping forces from both the inner and outer sides of the V-shaped groove 221 sidewall, forming a "clamping" effect. This inner and outer clamping structure ensures that when the V-shaped groove 221 sidewall is subjected to fluid pressure, the inner support plate 212 supports outward and the outer support plate 212 supports inward. The supporting forces on both sides are balanced and mutually constrained, which can more effectively resist the bulging or denting deformation of the sidewall under high pressure, while avoiding excessive deformation of the filter screen 22 sidewall to one side that may be caused by unilateral support.

[0043] Alternatively, the support plates 212 on the inner support 23 and the outer support 21 of the filter screen may not be strictly aligned, and a certain axial misalignment is allowed, as long as the inner and outer support plates 212 can respectively abut against the inner and outer surfaces of the sidewall of the V-groove 221; in addition, the number of support plates 212 on the inner and outer supports may also be different, for example, the number of support plates 212 on the inner support is more than the number of support plates 212 on the outer support, or vice versa, to adapt to different support strength requirements.

[0044] In some embodiments, the ribs 211 are equidistantly distributed along the circumference of the filter screen 22, and the number of ribs 211 corresponds one-to-one with the number of V-grooves 221.

[0045] Example 2 The present invention also provides a method for manufacturing the inner and outer supports of the filter screen as described above, such as... Figure 15 As shown, it includes the following steps: Step 1: Provide a planar injection mold and prepare a planar grating plate through an integrated injection molding process. The planar grating plate includes multiple parallel ribs 211 and multiple support plates 212 fixedly set on both sides of each rib 211. One end of each support plate 212 is fixedly connected to the rib 211, and a water passage gap is formed between two adjacent support plates 212. Step 2: The flat grid plate is rolled and bent along the extension direction of the rib plate 211 to bend the flat grid plate into a cylindrical structure that matches the arc contour of the filter screen 22.

[0046] In this embodiment, the inner and outer supports of the filter screen are manufactured using a two-step method: planar injection molding followed by rolling and bending. Compared to a cylindrical skeleton formed by direct injection molding, the planar injection mold has a simpler structure and lower processing cost, and the planar grid plate facilitates quality inspection and dimensional control. The rolling and bending process ensures that the relative positional relationship between the ribs 211 and the support plates 212 remains unchanged after the planar grid plate is bent into a cylindrical structure, guaranteeing precise fit between each rib 211 and the V-groove 221 after molding. Furthermore, the water passage gap formed between adjacent support plates 212 in step one allows the support to support the filter screen 22 without obstructing water flow through it, achieving both support and flow passage functions.

[0047] The rolling and bending process in step two can be carried out by cold bending or hot bending. Hot bending is suitable for bending engineering plastics (such as ABS) under heating conditions, which can reduce bending stress and prevent cracking.

[0048] In some examples, it also includes step three: fitting the cylindrical structure obtained in step two onto the inner or outer side of the filter screen 22, so that each of the ribs 211 is respectively embedded in each of the V-shaped grooves 221 of the filter screen 22, and one end of the rib 211 abuts against the bottom of the V-shaped groove 221, and the other end of each of the support plates 212 abuts against the side wall of the V-shaped groove 221, forming radial support for each of the V-shaped grooves 221 of the filter screen 22.

[0049] Example 3 The present invention also provides a mesh filter element 2, comprising: The filter screen 22 has a plurality of V-shaped grooves 221 continuously distributed along the circumference; As described above, the filter inner support 23 is disposed inside the filter 22. The ribs 211 of the filter inner support 23 are respectively embedded in the V-shaped grooves 221 of the filter 22, and one end of the rib 211 abuts against the bottom of the V-shaped groove 221. The support plates 212 on both sides of the rib 211 abut against the two side walls of the V-shaped groove 221 respectively. As described above, the filter screen outer support 21 is disposed outside the filter screen 22. The ribs 211 of the filter screen outer support 21 are respectively embedded in the V-shaped grooves 221 of the filter screen 22, and one end of the rib 211 abuts against the bottom of the V-shaped groove 221. The support plates 212 on both sides of the rib 211 abut against the two side walls of the V-shaped groove 221 respectively.

[0050] In this embodiment, by respectively setting the inner support 23 and the outer support 21 of the filter screen on the inner and outer sides of the filter screen 22, the ribs 211 of the inner and outer supports are embedded into the same V-shaped groove 221 from the inner and outer sides and abut against the bottom of the V-shaped groove 221. The support plates 212 of the inner and outer supports abut against the side walls of the V-shaped groove 221 from the inner and outer sides, respectively. Thus, an inner and outer clamping support is formed at the bottom and side walls of each V-shaped groove 221 of the filter screen 22. This three-layer composite structure allows the inner and outer supports to work together to resist the radial displacement of the V-shaped groove 221 and the bulging deformation of the side walls when the filter screen 22 is subjected to fluid pressure during operation. This ensures that the filter screen 22 maintains a stable wrinkled geometry under rated working pressure and avoids a decrease in filtration flux and filtration accuracy due to deformation of the filter screen 22.

[0051] In some embodiments, the filter screen 22 has 36 folds around its circumference, forming 36 V-shaped grooves 221 on the outer and inner sides of the filter screen 22.

[0052] In this embodiment, the filter screen 22 is set with 36 folds around the circumference. Through repeated experiments and verification by the inventors, this number of folds is found to be effective within a 30m radius. 3 The optimal overall performance is achieved under the rated filtration flow rate of / h: Too few folds (e.g., below 20 folds) result in limited improvement in effective filtration area, making it difficult to meet high-flow irrigation requirements; too many folds (e.g., above 50 folds) lead to excessively dense pleats and too small gaps between adjacent V-grooves 221, resulting in significantly increased water flow resistance. Simultaneously, the number of ribs 211 on the inner and outer supports increases accordingly, raising the weight and manufacturing cost of the frame. Furthermore, excessively dense pleats hinder the complete removal of impurities during backwashing. The 36-fold design, without significantly increasing flow resistance, increases the effective filtration area to approximately 6 times that of a traditional single-layer straight cylindrical filter screen 22, greatly improving filtration flux and dirt holding capacity.

[0053] Of course, the number of folds of the filter screen 22 is not limited to 36 folds, and can be adjusted according to actual use or simulation, such as 24 folds, 48 ​​folds, 30 folds, 42 folds, etc.; the folding angle of the V-groove 221 is also not limited to a specific value, and can be adapted and adjusted according to the diameter and number of folds of the filter screen 22. Usually, the included angle between two adjacent folds is in the range of 8° to 15°.

[0054] Example 4 The present invention also provides a mesh filter, comprising: a housing 1 and a mesh filter element 2 as described above, the filter element 2 being disposed inside the housing 1, the housing 1 being provided with an inlet 13 and an outlet 14, the inlet 13 being connected to the outer cavity of the mesh filter element 2, and the outlet 14 being connected to the inner cavity of the mesh filter element 2.

[0055] In this embodiment, the mesh filter with the aforementioned filter element 2 allows the filter medium to enter the housing 1 through the inlet 13 during operation. Under pressure, the medium flows through the filter screen 22, where impurities are trapped on its surface. Clean media passes through the filter screen 22 and is discharged through the outlet 14. Because the filter element 2 uses internal and external supports to independently support each V-shaped groove 221 of the filter screen 22, the filter can maintain a stable filtration throughput and filtration accuracy under its rated operating pressure. This significantly extends the continuous operating time and reduces the frequency of backwashing or disassembly and cleaning due to filter screen 22 clogging. This makes the filter suitable for scenarios requiring long-term continuous operation, such as agricultural irrigation.

[0056] In some embodiments, the housing 1 is provided with an axially extending mounting interface 3, and the inner wall of the mounting interface 3 is provided with internal threads. Multiple filter elements 2 are provided, and the multiple filter elements 2 are arranged sequentially along the axial direction of the housing 1; The bottom of the bottom filter element 2 is provided with a lower shell connecting sleeve 7. The outer wall of the lower shell connecting sleeve 7 is provided with external threads. The lower shell connecting sleeve 7 is detachably threaded to the internal thread of the installation interface 3 through the external threads. The top of the top filter element 2 is provided with a top cover assembly 4; the top cover assembly 4 is used to seal the opening on the top of the top filter element 2. The top cover assembly 4, the topmost filter element 2, the two adjacent filter elements 2, the bottommost filter element 2, and the lower shell connecting sleeve 7 are all clamped together by clamps 5.

[0057] In this embodiment, multiple filter elements 2 are sequentially connected in series along the axial direction of the housing 1. Adjacent filter elements 2 are tightly connected by clamps 5. The bottom filter element 2 is threadedly connected to the mounting interface 3 of the housing 1 through the lower housing connecting sleeve 7, and the top filter element 2 has its upper opening sealed by the upper cover assembly 4, thus achieving a modular series combination of multiple filter element 2 units. This multi-filter element 2 series structure allows users to flexibly select the number of filter elements 2 (e.g., 1 to 4) according to actual flow requirements and filtration accuracy requirements, improving the applicability and scalability of the filter. At the same time, the multi-stage fixing method combining threaded connection and clamp 5 connection ensures that each filter element 2 is reliably pressed together in the axial direction, and the end faces of adjacent filter elements 2 fit tightly, effectively preventing bypass leakage caused by end face gaps.

[0058] Alternatively, the connection method between multiple filter elements 2 is not limited to clamping with clamp 5, but can also adopt other detachable connection methods such as threaded connection, quick coupling connection or snap-fit ​​connection; the threaded connection of the mounting interface 3 is not limited to the external thread of the lower shell connecting sleeve 7 and the internal thread of the mounting interface 3, but can also be the opposite structure of the internal thread of the lower shell connecting sleeve 7 and the external thread of the mounting interface 3; the number of filter elements 2 can be set to 1, 2, 3, 4 or more according to the length of the shell 1 and the filtration requirements. When only 1 filter element 2 is set, the series structure of clamp 5 can be omitted, and the filter element 2 is directly connected to the shell 1 through the lower shell connecting sleeve 7.

[0059] In some embodiments, the inner wall of the clamp 5 is provided with an annular limiting groove, and the bottom of the limiting groove is integrally formed with an annular positioning rib 52, which divides the annular limiting groove into two sub-limiting grooves 53; after assembly, the limiting platform on the upper cover assembly 4 and the limiting platform of the topmost filter element 2 are respectively located in the two sub-limiting grooves 53 of the same clamp 5. The limiting platforms of two adjacent filter elements 2 are respectively located in the two sub-limiting grooves 53 of the same clamp 5; The limiting platform of the bottom filter element 2 and the limiting platform of the lower shell connecting sleeve 7 are respectively located in the two sub-limiting grooves 53 of the same clamp 5; An annular sealing plate 61 is provided between the top cover assembly 4 and the topmost filter element 2, between two adjacent filter elements 2, and between the bottommost filter element 2 and the lower shell connecting sleeve 7; the annular sealing plate 61 is located inside the annular positioning rib 52.

[0060] In this embodiment, the clamp 5 divides the annular limiting groove into two sub-limiting grooves 53 by annular positioning ribs 52. During assembly, the limiting platforms of two adjacent components (such as the upper cover assembly 4 and the filter element 2, the two filter elements 2, and the filter element 2 and the lower shell connecting sleeve 7) are respectively inserted into the two sub-limiting grooves 53. The annular positioning ribs 52 are clamped between the two components to achieve axial positioning and circumferential fixation of the two components. At the same time, an annular sealing plate 61 is clamped between the two components, and the sealing plate is located radially inside the annular positioning ribs 52. When the clamp 5 is tightened, the annular positioning ribs 52 provide radial clamping force, and the annular sealing plate 61 is pressed between the end faces of the two components to form an end face seal.

[0061] In some embodiments, the filter element 2 is provided with support cylinders 62 at the top, bottom and middle; the support cylinder 62 in the middle of the filter element 2 is connected to the support cylinder 62 at the top by connecting ribs 63.

[0062] Each annular sealing plate 61 is integrally formed with several support cylinders 62 to form a central branch pipe 6. The hardness of the annular sealing plate 61 is greater than that of the filter element 2. The structures of the multiple central branch pipes 6 are identical, such as Figure 13 As shown.

[0063] In this embodiment, on the one hand, the central branch pipe 6 provides radial support for the filter element 2 from the inside, and the support cylinder 62 supports the inner wall of the filter element 2, which can effectively resist the inward squeezing of the inner wall of the filter element 2 by the high pressure water flow and prevent the filter element 2 from deforming inward under high pressure; on the other hand, the central branch pipe 6 also has the functions of axial force transmission and sealing - when the clamp 5 is locked, the axial pressing force generated between each filter element 2 is directly transmitted through the rigid cylinder wall of the central branch pipe 6, so that the end faces of adjacent annular sealing plates 61 are pressed and adhered, forming a continuous sealing barrier, which further enhances the end face sealing effect and completely blocks the bypass leakage path of the medium passing through the gap between the end faces of adjacent filter elements 2.

[0064] In addition, the consistent structure of multiple central branch pipes 6 means that each central branch pipe 6 has the same size and interface specifications, which simplifies the types of components and facilitates mass production.

[0065] In some embodiments, such as Figure 14As shown, the clamp 5 is a split clamp, consisting of two identical half-clamp bodies, which are integrally injection molded using the same mold. The two mating surfaces of the half-clamp bodies are respectively provided with mutually compatible rectangular tenon-and-groove positioning structures 51. One end face has a rectangular tenon 512 and a positioning groove 511, while the other end face has a corresponding matching rectangular groove and a positioning boss. During assembly, the two half-clamp bodies are interlocked by the rectangular tenon 512 and the rectangular groove to form circumferential positioning, thereby limiting the relative misalignment, deflection, and circumferential movement between the two half-clamp bodies at the mating surface; and are fixedly connected by bolts.

[0066] In this embodiment, the two half-clamps are integrally injection molded using the same mold. This not only ensures the dimensional consistency of the two half-clamps but also doubles the output of a single mold (two half-clamps are obtained in one injection), improving production efficiency and reducing mold costs. The two half-clamps interlock using a rectangular mortise and tenon positioning structure 51, achieving circumferential positioning at the mating surface. This effectively prevents misalignment, deflection, and circumferential movement of the two half-clamps during locking or under working vibration conditions, ensuring uniform compression of the clamp 5 onto the two connecting components. Furthermore, since the two half-clamps have identical structures, either half-clamp can be paired with the other without distinguishing between left and right or top and bottom, further improving the interchangeability and assembly convenience of the parts.

[0067] During assembly, the filter screen 22 is first clamped between the inner support 23 and the outer support 21 to form the filter element 2. The upper cover assembly 4, the outer support 21, the lower filter element 2 assembly, and the lower shell connecting sleeve 7 are connected in series by the split clamp. Finally, the lower shell connecting sleeve 7 is screwed into the lower shell 11 to complete the overall assembly.

[0068] This invention achieves multi-level reliable connection and sealing of the filter screen 22 components through the double interference fit and tenon-and-mortise positioning of the multi-component three-dimensional clamps, combined with the threaded locking structure. At the same time, the planar integrated mold opening and rolling forming process greatly improves the strength of the skeleton structure and production efficiency. Combined with the 36-fold filter screen 22, the filtration efficiency is greatly improved. This invention solves the technical pain points of traditional filters, such as small filtration area, easy deformation, poor connection reliability, and complex molding process, and is suitable for the long-term stable operation requirements of high-pressure conditions such as agricultural irrigation.

[0069] In some embodiments, the upper housing 12 and the lower housing 11 are clamped together by a clamping ring 8.

[0070] The working process is as follows: After the overall assembly of this combined structure is completed, the filter enters the normal filtration working state. The medium to be filtered (such as agricultural irrigation water) enters the filter through the inlet 13 on one side of the lower shell 11. Under pressure, it flows into the three-layer composite filter element 2, which consists of the inner filter support 23, the 304 stainless steel filter screen 22, and the outer filter support 21, forming an annular filtration channel. When the medium to be filtered flows through the filter screen 22, its axial continuous Z-shaped corrugated pleated structure (36 folds around the circumference) provides a large effective filtration area, which can efficiently intercept impurity particles in the medium. The impurities are stably trapped on the outer surface of the filter screen 22. The filtered clean medium passes through the mesh of the filter screen 22 and enters the chamber between the inner filter support 23 and the central branch pipe 6. Finally, it is discharged through the outlet 14 on the symmetrical side of the lower shell 11, completing one filtration operation.

[0071] During operation, the outer support 21 and the inner support 23 of the filter screen are clamped and fixed together by the internal central branch pipe and the external clamp. This forms an all-round radial rigid constraint on the filter screen 22. In conjunction with the 36 sets of radial support ribs evenly distributed circumferentially on the outer support 21, the radial bulging deformation of the filter screen 22 under the rated working pressure can be effectively suppressed, maintaining the geometric consistency of the 36 folds, ensuring a constant flow channel cross-section, and avoiding problems such as reduced filtration throughput and impurity leakage caused by deformation of the filter screen 22.

[0072] Meanwhile, the multi-component detachable clamp, through rectangular tenon and mortise positioning and double interference fit, works in conjunction with the threaded locking structure of the lower shell connecting sleeve 7 and the lower shell 11 to completely block the bypass leakage path and ensure stable filtration accuracy.

[0073] When too many impurities are trapped on the surface of filter screen 22, causing the filtration pressure to rise, the filtration flux to decrease, or the inlet and outlet pressure difference to reach the preset threshold, the backwashing operation is initiated. By changing the direction of water flow and altering the flow path of the medium, the strong fluid impact and shearing force formed by the reverse water flow are used to completely peel off and flush out the impurity particles attached to and trapped on the outer surface of filter screen 22, quickly restoring the effective filtration area and permeability of filter screen 22, and ensuring the continuous and stable operation of the filter. If, after backwashing, the filter screen 22 still has structural damage, severe deformation, or permanent blockage, and its filtration performance cannot be restored through backwashing, then the filter element 2 needs to be disassembled and replaced. The specific steps are as follows: Loosen the clamping ring 8 to separate the upper housing 12 and the lower housing 11; loosen the threaded connection between the lower housing connecting sleeve 7 and the lower housing 11; remove the entire filter element 2 assembly after disassembling the multi-part clamp; remove the damaged 304 stainless steel filter screen 22 from between the inner support 23 and the outer support 21; replace it with a new 304 stainless steel filter screen 22; precisely align the new filter screen 22 with the inner and outer supports according to the original assembly method; then reset the assembled filter element 2 assembly; and sequentially tighten the multi-part clamp, the threaded structure of the lower housing connecting sleeve 7, and the clamping ring 8 between the upper housing 12 and the lower housing 11 to ensure that all connection parts 213 are reliably sealed and have no sideflow leakage. After the replacement is completed, the filter can be put back into normal filtration operation.

[0074] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A filter screen inner and outer support for supporting a filter screen, the filter screen having a plurality of V-shaped grooves continuously distributed circumferentially, characterized in that, include: Multiple ribs are provided, each of which is arranged parallel to the axis of the filter screen. Each rib is respectively disposed in a V-shaped groove, and one end of the rib abuts against the bottom of the V-shaped groove. Support plates are provided on both sides of each rib. The plane of the support plate intersects with the plane of the rib. One end of each support plate is fixedly connected to the rib, and the other end abuts against the side wall of the V-shaped groove.

2. The filter screen inner and outer supports according to claim 1, characterized in that: The end face of the rib that abuts against the bottom of the V-groove is an arc-shaped abutment surface that matches the curvature of the bottom of the V-groove; The plane containing the support plate is orthogonal to the plane containing the rib plate.

3. The filter screen inner and outer supports according to claim 1, characterized in that: The support plates on the inner and outer supports of the filter screen are positioned relative to each other; The ribs are evenly distributed along the circumference of the filter screen, and the number of ribs corresponds one-to-one with the number of V-shaped grooves.

4. A method for manufacturing the inner and outer supports of a filter screen according to any one of claims 1 to 3, characterized in that, Includes the following steps: Step 1: Provide a planar injection mold and prepare a planar grating plate through an integrated injection molding process. The planar grating plate includes multiple parallel ribs and multiple support plates fixedly disposed on both sides of each rib. One end of each support plate is fixedly connected to the rib, and a water passage gap is formed between two adjacent support plates. Step 2: The planar grid plate is rolled and bent along the extension direction of the rib plate to form a cylindrical structure that matches the arc contour of the filter screen.

5. A mesh filter element, characterized in that, include: A filter screen having a plurality of V-shaped grooves continuously distributed circumferentially; The filter inner support is the filter inner and outer support as described in any one of claims 1 to 4, which is disposed inside the filter. The ribs of the filter inner support are respectively embedded in the V-shaped groove of the filter, and one end of the rib abuts against the bottom of the V-shaped groove. The support plates on both sides of the rib abut against the two side walls of the V-shaped groove. The filter screen outer support, according to any one of claims 1 to 4, is disposed outside the filter screen, wherein the ribs of the filter screen outer support are respectively embedded in the V-shaped grooves of the filter screen, and one end of the rib abuts against the bottom of the V-shaped groove, and the support plates on both sides of the rib abut against the two side walls of the V-shaped groove.

6. The mesh filter element according to claim 5, characterized in that: The filter screen has 36 folds around its circumference, forming 36 V-shaped grooves on both the outer and inner sides of the filter screen.

7. A mesh filter, characterized in that, include: The housing and the mesh filter element as described in claim 5 or 6, wherein the filter element is disposed within the housing, and the housing is provided with an inlet and an outlet.

8. The mesh filter according to claim 7, characterized in that: The housing is provided with an axially extending mounting interface, and the inner wall of the mounting interface is provided with internal threads. Multiple filter elements are provided, and the multiple filter elements are arranged sequentially along the axial direction of the housing; The bottom of the bottommost filter element is provided with a lower shell connecting sleeve. The outer wall of the lower shell connecting sleeve is provided with external threads. The lower shell connecting sleeve is detachably threadedly connected to the internal threads of the mounting interface through the external threads. The top of the topmost filter element is provided with a top cover assembly; the top cover assembly is used to seal the opening on the topmost filter element; The top cover assembly, the topmost filter element, the two adjacent filter elements, the bottommost filter element, and the lower shell connecting sleeve are all secured by clamps.

9. The mesh filter according to claim 8, characterized in that: The inner wall of the clamp is provided with an annular limiting groove, and the bottom of the limiting groove is integrally formed with an annular positioning rib, which divides the annular limiting groove into two sub-limiting grooves; after assembly, the limiting platform on the upper cover assembly and the limiting platform of the topmost filter element are respectively located in the two sub-limiting grooves of the same clamp. The limiting platforms of two adjacent filter elements are respectively located in the two sub-limiting grooves of the same clamp; The limiting platform of the bottommost filter element and the limiting platform of the lower shell connecting sleeve are respectively located in the two sub-limiting grooves of the same clamp; An annular sealing plate is provided between the top cover assembly and the topmost filter element, between two adjacent filter elements, and between the bottommost filter element and the lower shell connecting sleeve; the annular sealing plate is located inside the annular positioning rib. The filter element is provided with support cylinders at the top, bottom and middle; Each of the annular sealing plates is integrally formed with several of the support cylinders to form a central branch pipe; The structures of the multiple central branch pipes are identical.

10. The mesh filter according to claim 9, characterized in that: The clamp is a split clamp, consisting of two identical half-clamp bodies, which are integrally injection molded using the same mold. The two mating surfaces of each half-clamp body are provided with mutually matching rectangular tenon-and-groove positioning structures. One end face has a rectangular tenon and a positioning groove, while the other end face has a corresponding matching rectangular groove and a positioning boss. During assembly, the two half-clamp bodies interlock using the rectangular tenon and the rectangular groove to form circumferential positioning, thus limiting relative misalignment, deflection, and circumferential movement between the two half-clamp bodies at the mating surfaces. They are then fixedly connected by bolts.

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