Bionic filter screen structure for water and fertilizer integrated net type filter

Abstract

The application discloses a kind of water and fertilizer integration net type filter with biomimetic filter screen structure, belong to agricultural irrigation technical field, entire filter screen component is cylindrical, it is evenly distributed using multilayer support ring and longitudinal pillar, by welding fixed as cylindrical structure;The upper portion of metal frame is inwards and is contracted to form upper end, and circular ring platform is installed sealing ring, lower end is connected with filter end cover, and annular groove is installed sealing ring.According to the surface characteristics of fish scale design biomimetic crescent microstructure effectively produces water trapping effect, that is, enhance hydrophilicity effectively reduce surface friction resistance to achieve drag reduction effect.Filter screen hole is left-right symmetrical as a whole, left side and right side have two round corner parts, and the middle is the main structure of crescent shape formed by two arcs.Fluid simulation and experimental results show that the application can significantly improve the hydraulic performance, filtering performance and anti-blocking performance of the net type filter, and is more suitable for irrigation environments with high water demand and high sand content, with a wide range of adaptation.

Description

Technical Field

[0001] This invention belongs to the field of agricultural irrigation technology, specifically relating to a biomimetic filter structure for an integrated water and fertilizer mesh filter. Background Technology

[0002] Irrigation water use in northern and western my country generally faces problems such as water scarcity and low utilization efficiency. Crop cultivation in arid and water-scarce areas relies on drip irrigation technology to improve water resource utilization, and mesh filters are one of the key components of drip irrigation systems. While traditional stainless steel wire mesh filters offer advantages such as high durability, easy disassembly, and cost-effectiveness, the most crucial requirement for mesh filters lies in the filter pores. The shape of the pores affects the maximum pressure drop, the area of ​​the maximum flow velocity zone, and the flow rate over the mesh surface, thus influencing the filter's hydraulic performance.

[0003] Currently, water-scarce areas also suffer from soil erosion and strong winds, resulting in high sediment content in the water. Consequently, mesh filters are more prone to clogging due to the high sediment content, accelerating the transition from media clogging to filter cake clogging and impacting filter performance and lifespan. Traditional stainless steel wire mesh filter structures still have significant room for improvement in hydraulic performance and anti-clogging capabilities; improvements would greatly enhance the efficiency of the entire drip irrigation system. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a biomimetic filter structure for an integrated water and fertilizer mesh filter. This structure is designed to solve the technical problem that the mesh filter's performance and lifespan are affected by the accelerated transition from media clogging to filter cake clogging due to high sand content. The invention improves the hydraulic performance, anti-clogging performance, and filtration performance of the mesh filter, thereby achieving the goals of saving water resources and improving the working efficiency of the drip irrigation system.

[0005] The present invention adopts the following technical solution:

[0006] A biomimetic filter structure for an integrated water and fertilizer mesh filter includes a support frame, on which multiple layers of support rings and longitudinal pillars are evenly distributed. The support frame, multiple layers of support rings and longitudinal pillars together form a cylindrical structure. A filter structure is provided on the surface of the support frame, and crescent-shaped filter holes are evenly distributed on the filter structure.

[0007] Preferably, sealing rings are provided at the upper and lower ends of the support frame.

[0008] Preferably, the upper part of the support frame tapers inward into a circular structure as the upper end, and a circular platform structure is provided at the taper for installing the corresponding sealing ring.

[0009] Preferably, the lower end is used to connect the end cap of the filter, and the lower end is provided with an annular groove structure for installing the corresponding sealing ring.

[0010] Preferably, the distance between the support ring and the longitudinal support column is 30mm to 35mm.

[0011] Preferably, the filter mesh has a rounded corner on the left and right sides, and the middle of the filter mesh is a concave arc portion. The center of the arc portion is based on a circle, and the centers of the upper and lower arcs are vertically collinear with the center of the reference circle.

[0012] Preferably, the dimensions of the circular reference are: diameter d1: radius of the lower arc R1: radius of the upper concave arc R2: radius of the rounded corners on the left and right sides R3 = 15: (16~12): (14~8): (4~3), and the value of d1 is consistent with the screen hole size under the corresponding screen mesh number.

[0013] Preferably, the diameter d1 of the circular reference is 0.15 mm, the radius R2 of the concave arc portion in the upper middle part is 0.08 to 0.12 mm, and the radius R3 of the rounded corners on the left and right sides is 0.03 to 0.04 mm; the lower arc portion is located in the center of the bottom, and the radius R1 of the arc is 0.14 to 0.16 mm.

[0014] Preferably, the lateral distance between the filter mesh holes is 0.40 to 0.42 mm, and the longitudinal distance is 0.40 to 0.42 mm.

[0015] Preferably, the overall shape of the filter mesh is symmetrical from left to right.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] A biomimetic filter structure for an integrated water and fertilizer mesh filter, featuring a crescent-shaped structure designed based on biomimetic principles, effectively reduces surface frictional resistance by enhancing hydrophilicity, thus achieving drag reduction. Compared to traditional pore types, this biomimetic filter structure further reduces water flow resistance and improves hydraulic performance. Simultaneously, the curved shape of the mesh effectively reduces impurity accumulation and clogging compared to traditional meshes, increasing effective filtration time while maintaining filtration efficiency, thereby enhancing the filtration performance of the mesh filter. Therefore, this invention is suitable for irrigation environments with high water demand and high sand content, thus broadening its applicability.

[0018] Furthermore, the upper part of the support frame tapers inward into a circular structure as the upper end, and a circular platform structure is provided at the taper for installing the corresponding sealing ring. This setting, together with the sealing ring, plays a sealing role, preventing irrigation water from directly depositing at the bottom of the filter without being filtered by the filter screen.

[0019] Furthermore, the lower end is used to connect the end cap of the filter, and the lower end is provided with an annular groove structure for installing the corresponding sealing ring. The advantage of this setting is that it works in conjunction with the upper end structure to ensure a sealed environment inside the filter, thereby ensuring the normal operation of the filter.

[0020] Furthermore, the spacing between the support ring and the longitudinal support column is set to save raw materials while effectively supporting the filter screen and ensuring that the filter screen does not deform when subjected to water flow impact.

[0021] Furthermore, the crescent-shaped filter mesh structure designed with biomimetic principles can more evenly distribute stress and has strong resistance to deformation under high water pressure, thereby increasing the service life of the filter mesh; it has a good drag reduction effect and effectively improves the hydraulic performance of the mesh; at the same time, this structure can effectively slow down the clogging speed and improve the filtration efficiency of the mesh filter.

[0022] Furthermore, the purpose of setting the horizontal and vertical spacing of the filter mesh holes is to ensure that the filter mesh holes are distributed evenly and dispersed by a suitable spacing.

[0023] In summary, the biomimetic filter structure of the integrated water and fertilizer mesh filter of this invention adopts a biomimetic fish scale microstructure design, which can effectively improve the hydraulic performance, anti-clogging performance and filtration efficiency of the mesh filter, thereby improving the working efficiency of the drip irrigation system; at the same time, it also increases the service life of the filter.

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the filter screen of the present invention;

[0026] Figure 2 This is a schematic diagram of the crescent-shaped mesh of the present invention;

[0027] Figure 3 This is a schematic diagram of the pressure distribution in the Y-type mesh filter of the present invention;

[0028] Figure 4 This is a schematic diagram of the velocity distribution in the Y-type mesh filter of the present invention;

[0029] Figure 5 The hydraulic performance curve of the Y-type mesh filter of the present invention under clean water conditions;

[0030] Figure 6 This is a curve showing the instantaneous filtration efficiency of the Y-type mesh filter of the present invention over time.

[0031] The components are: 1. Filter structure; 2. Support frame; 3. Upper end; 4. Lower end; 5. Filter mesh. Detailed Implementation

[0032] 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, 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.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] 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.

[0035] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0039] This invention provides a biomimetic filter structure for an integrated water and fertilizer mesh filter, comprising a filter screen, a support frame, an upper end, a lower end, and crescent-shaped filter holes evenly distributed on the filter screen. The entire filter assembly is cylindrical, using multiple layers of support rings and longitudinal pillars evenly distributed, fixed into a cylindrical structure by welding. The upper part of the metal frame tapers inward to form the upper end, and a circular platform is provided to install the sealing ring. The lower end connects to the filter end cap, and a circular groove is provided to install the sealing ring. The biomimetic crescent-shaped microstructure designed based on the surface characteristics of fish scales effectively generates a "water-capturing" effect, that is, enhancing hydrophilicity and effectively reducing surface friction resistance to achieve a drag reduction effect. The filter holes are generally symmetrical, with two rounded corners on the left and right sides, and a crescent-shaped main structure in the middle composed of two arcs. Fluid simulation and experimental results show that the crescent-shaped filter structure of this invention can significantly improve the hydraulic performance, filtration performance, and anti-clogging performance of the mesh filter compared with traditional hole types, and is more suitable for irrigation environments with large water demand and high sand content, with a wider range of applications.

[0040] Please see Figure 1 The present invention discloses a biomimetic filter structure for an integrated water and fertilizer mesh filter. The entire biomimetic filter structure is cylindrical in shape and includes a filter structure 1, a support frame 2, an upper end 3, and a lower end 4. Filter mesh holes 5 are evenly distributed on the filter structure 1, and the filter mesh holes 5 are crescent-shaped.

[0041] The support frame 2 adopts a multi-layer support ring evenly distributed structure to wrap and fix the filter structure 1 into a cylindrical structure. The upper part of the support frame 2 shrinks inward into a circular structure as the upper end 3. A circular platform structure is provided at the shrinkage point for installing the corresponding sealing ring. The lower part of the support frame 2 is provided with a lower end 4 for connecting the filter end cap. A circular groove structure is provided at the lower end 4 for installing the corresponding sealing ring.

[0042] The spacing between the support ring and the longitudinal support column is 30mm to 35mm.

[0043] Please see Figure 2The filter structure 1 includes multiple evenly distributed filter holes 5. The overall shape of the filter holes 5 is symmetrical from left to right, with a rounded corner on the left and right sides and a concave arc in the middle. The central part is based on a circle with a diameter d1 of 0.15 mm. The radius R2 of the concave arc in the upper middle part is 0.08 to 0.12 mm, and the radius R3 of the rounded corners on the left and right sides is 0.03 to 0.04 mm. The lower arc is located at the center of the bottom, with an arc radius R1 of 0.14 to 0.16 mm.

[0044] Using the center of the central circle as a reference, the hole spacing is 0.40-0.42 mm laterally and 0.40-0.42 mm longitudinally.

[0045] The above only applies to 100-mesh mesh filters. For filters with different mesh counts, d1 is a fixed value determined according to the mesh count. The size ratio between each size is d1:R1:R2:R3 = 15:(16~12):(14~8):(4~3).

[0046] Wherein, d1 is consistent with the sieve aperture size under the corresponding sieve mesh number, according to the standard T / CNIA0137-2022 "Correspondence between test sieve aperture size and sieve mesh number".

[0047] Preferably, the diameter d1 of the reference circle is 0.15mm, the radius R2 of the concave arc portion in the upper middle part is 0.10mm, and the radius R3 of the rounded corners on the left and right sides is 0.03mm; the lower arc portion is located in the center of the bottom, and the arc radius R1 is 0.15mm.

[0048] Using the center of the central circle as a reference, the hole spacing is 0.42mm horizontally and 0.41mm vertically.

[0049] The above only applies to 100-mesh mesh filters. For filters with different mesh counts, d1 is a fixed value determined according to the mesh count. The dimensional ratio between each size is d1:R1:R2:R3 = 15:15:10:3.

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] Please see Figure 3 and Figure 4 A crescent-shaped filter screen was applied to a small Y-type filter for CFD simulation analysis of its hydraulic performance. The pressure and velocity distribution of the filter were observed. The pressure increased continuously from the inside out, like a vortex. This was due to the high pressure of the water flow caused by the constricted inlet, which resulted in backflow and collision with the inlet water flow when impacting the filter screen, creating unstable pressure. After the high-speed water flow entered the filter screen, it impacted the upper filter screen wall, forming a downward vortex. Most of the water flowed downwards, where the velocity dropped sharply, and the water remained at the bottom, effectively trapping small sand particles.

[0052] The crescent-shaped filter exhibits a more uniform flow rate and better outflow characteristics compared to traditional filter screens, reducing wear on the screen pores and effectively minimizing the likelihood of slow clogging due to sediment and microorganisms. This delays filter failure and extends its lifespan.

[0053] Please see Figure 5 This invention provides a flow rate-head loss relationship curve for a Y-type mesh filter using a crescent-shaped filter screen, obtained through actual experiments. Figure 5 The horizontal axis represents the inflow rate Q (m³). 3 / h), with the vertical axis representing the head loss Δh (m). The relationship for the crescent-shaped filter is y = 0.352x 1.755 Compared to common round and square holes, the head loss coefficient is reduced by 16.5% and 3.56% respectively, meaning that the hydraulic performance is improved by 16.5% and 3.56% compared to these two types of holes. Taking all factors into account, the crescent-shaped hole exhibits significantly improved hydraulic performance compared to traditional filter screens, making it more suitable for applications in mesh filters, particularly in environments with high water demand.

[0054] Please see Figure 6 This invention provides an experimental curve illustrating the relationship between operating time and filtration efficiency for a Y-type mesh filter. Figure 6The horizontal axis represents operating time (s), and the vertical axis represents filtration efficiency (%). Under the same water-sand concentration and inlet flow rate, traditional circular and square holes reach the late stage of filter cake clogging at 100s and 250s, respectively, approaching complete clogging. In contrast, the crescent-shaped holes remain in the early to mid-stage of filter cake clogging around 2500s. Maintaining this stage for an extended period not only does not significantly impede water flow but also improves sand filtration. Furthermore, calculations show that the average filtration efficiency of the biomimetic crescent-shaped filter screen is 40.2% and 11.4% higher than that of the traditional circular and square holes, respectively.

[0055] In summary, the biomimetic filter structure for an integrated water and fertilizer mesh filter of the present invention has significantly improved anti-clogging performance and filtration efficiency of crescent-shaped holes compared with traditional filter mesh holes. The crescent-shaped mesh filter is more suitable for irrigation conditions with high sand content.

[0056] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A biomimetic filter screen structure for an integrated water and fertilizer mesh filter, characterized in that, The support frame (2) includes multiple layers of support rings and longitudinal pillars evenly distributed on it. The support frame (2), multiple layers of support rings and longitudinal pillars together form a cylindrical structure. A filter structure (1) is provided on the surface of the support frame (2). Crescent-shaped filter holes (5) are evenly distributed on the filter structure (1). There is a rounded corner on the left and right sides of each filter hole (5). The middle of the filter hole (5) is a concave arc part. The center of the arc part is based on a circle. The centers of the upper and lower arcs are vertically collinear with the center of the reference circle. The diameter of the circular reference circle is... Radius of the lower arc The radius of the concave arc portion in the upper middle part : Radius of the left and right corners =15: (16~12): (14~8): (4~3), The value should be consistent with the screen aperture size for the corresponding screen mesh number.

2. The biomimetic filter screen structure for the integrated water and fertilizer mesh filter according to claim 1, characterized in that, Sealing rings are provided at the upper end (3) and lower end (4) of the support frame (2).

3. The biomimetic filter screen structure for the integrated water and fertilizer mesh filter according to claim 2, characterized in that, The upper part of the support frame (2) shrinks inward into a circular structure as the upper end (3), and a circular platform structure is provided at the shrinkage point for installing the corresponding sealing ring.

4. The biomimetic filter screen structure for the integrated water and fertilizer mesh filter according to claim 2, characterized in that, The lower end (4) is used to connect the end cap of the filter, and an annular groove structure for installing the corresponding sealing ring is provided at the lower end (4).

5. The biomimetic filter screen structure for the integrated water and fertilizer mesh filter according to claim 1, characterized in that, The spacing between the support ring and the longitudinal support column is 30mm~35mm.

6. The biomimetic filter screen structure for the integrated water and fertilizer mesh filter according to claim 1, characterized in that, Dimensions of the circular reference diameter The radius of the concave arc portion in the upper middle part is 0.15mm. The radius of the fillet on both the left and right sides is 0.08~0.12mm. The diameter is 0.03~0.04mm; the lower arc-shaped part is located in the center of the bottom, with a radius of curvature of 0.03~0.04mm. The thickness is 0.14~0.16mm.

7. The biomimetic filter screen structure for the integrated water and fertilizer mesh filter according to claim 1, characterized in that, The horizontal distance between the holes of the filter screen (5) is 0.40~0.42mm, and the vertical distance is 0.40~0.42mm.

8. The biomimetic filter screen structure for the integrated water and fertilizer mesh filter according to claim 1, characterized in that, The overall shape of the filter mesh (5) is symmetrical from left to right.

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