A small piece of anti-clogging drip irrigation emitter full-process design method
By employing a full-process design approach and optimizing the three-dimensional vortex wall washing process, the problem of insufficient local improvements in the design of irrigation emitters has been solved, enabling the scientific quantification and efficient production of small-sized, anti-clogging drip irrigation emitters.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA AGRI UNIV
- Filing Date
- 2026-03-28
- Publication Date
- 2026-07-10
AI Technical Summary
Existing anti-clogging designs for irrigation devices mostly focus on single-point improvements to local flow channel structures, lacking a systematic design approach for the entire process. The design process relies on trial and error based on experience, and key geometric parameters lack quantitative control. It fails to comprehensively consider hydraulic performance, anti-clogging performance, and manufacturing costs, affecting product consistency and engineering applicability.
A full-process design approach was adopted, and a structural parameter-flow relationship model was established through numerical simulation. Candidate flow channel structural parameters were screened, and the Comprehensive Relative Index of Anti-clogging Performance (RCAI) was introduced for evaluation. Three-dimensional vortex wall washing optimization was carried out, and auxiliary structures were designed in conjunction with processing and manufacturing constraints, ultimately forming a small-sized plate-type anti-clogging drip irrigation emitter.
This approach enables the scientific quantification of irrigation device design, improves design efficiency and parameter accuracy, ensures stable product implementation in actual production, and enhances product consistency and engineering applicability.
Smart Images
Figure CN122365746A_ABST
Abstract
Description
Technical Field
[0001] This invention patent relates to the field of agricultural water-saving irrigation equipment design technology, specifically to a whole-process design method for a small-sized anti-clogging drip irrigation emitter. Background Technology
[0002] As a core component of drip irrigation systems, the flow channel structure design of drip irrigation emitters directly determines their flow stability, anti-clogging performance, and long-term operational reliability. With the development of efficient water-saving irrigation technologies in agriculture towards large-scale, thin-walled, and low-cost production, disc drip irrigation emitters are showing a clear trend towards miniaturization. Maintaining stable flow capacity and good anti-clogging performance while continuously reducing the overall size of the emitters places higher demands on their design and manufacturing. Currently, the flow channel structure parameters of existing emitters are mostly selected based on experience or through localized adjustments to existing configurations. This makes it difficult to accurately design corresponding anti-clogging emitter structures according to different flow requirements, resulting in long product development cycles and poor performance consistency.
[0003] To improve the overall performance of irrigation emitters, the industry has conducted a series of beneficial explorations. For example, patent application CN201610467281.0 filed by Li Yunkai et al. discloses a flow channel design method for drip irrigation emitters based on fractal geometry. By introducing fractal M-curves to improve the traditional labyrinth unit, the turbulence intensity of the flow field is increased, thereby improving the hydraulic performance and anti-clogging performance to a certain extent. In addition, another patent application CN201810047877.4 filed by Li Yunkai et al. discloses a vortex wall washing optimization method. By optimizing the structure of the water-facing and back-facing areas of the flow channel with circular arcs, it aims to weaken the low-velocity stagnation zone and effectively improve the wall shear force, thereby further enhancing the anti-clogging ability of the emitter.
[0004] While the aforementioned existing technologies have achieved significant breakthroughs in improving local flow patterns or optimizing specific structural performance, they still have the following shortcomings: First, existing anti-clogging designs mainly focus on improving local channel structures or single hydraulic characteristics, representing single-point technical optimization for a specific problem. They have not yet formed a comprehensive, systematic design method that takes the target flow rate as input, considers both hydraulic performance and anti-clogging performance, and integrates the determination of overall emitter structural parameters. The design process still largely relies on the designer's experience for repeated adjustments and trial and error. Second, existing technologies lack clear, quantifiable optimal control thresholds for key geometric structural parameters closely related to emitter performance, such as channel width, channel depth, and tooth tip radius, making it difficult to directly guide the systematic screening and determination of emitter structural parameters. Finally, when determining the threshold values of key geometric parameters, existing technologies often focus on a single dimension, such as hydraulic performance or anti-clogging performance. They fail to comprehensively weigh multiple constraints, including hydraulic performance, anti-clogging performance, manufacturing cost, and manufacturability (such as mold micro-machining capability, minimum formable size, patch indentation compensation, etc.), during the parameter determination stage. This results in the design scheme being difficult to achieve stably in practical applications due to the contradiction between performance indicators, cost constraints, and processing and production, which affects the consistency of the product and its engineering applicability.
[0005] Invention Patent Content (a) The problems to be solved by this invention are: (1) Existing anti-clogging designs for irrigation devices are mostly focused on single-point improvements to the local structure of the flow channel. They have not yet formed a full-process design method that takes the target flow rate as input, selects the through parameters, and forms the structure. As a result, the design process still relies on experience and trial and error, resulting in low development efficiency. (2) The key geometric parameters such as the width and depth of the flow channel, which are closely related to the anti-clogging performance, lack a quantifiable optimal range of values. Designers find it difficult to scientifically determine the specific structural dimensions, which affects the accuracy and consistency of the design results. (3) When determining the structural parameters, the existing technology fails to comprehensively weigh the hydraulic performance, anti-clogging performance, manufacturing cost, and manufacturability. As a result, the design scheme is often difficult to achieve stably due to its deviation from the actual processing conditions, which restricts the engineering applicability of the product.
[0006] (II) Technical Solution A complete process design method for a small, flat, anti-clogging drip irrigation emitter includes the following steps: S1: Determine the basic geometric configuration of the irrigation emitter's flow channel, select the flow channel width W, depth D, and number of structural units N as the main structural parameters, obtain the rated outflow Q of each combination under standard pressure conditions through numerical simulation, form a data sample set corresponding to structural parameters and flow rates, and establish an irrigation emitter structural parameter-flow rate relationship model. S2: Based on the target emitter output flow rate Q tUsing a preset emitter structure parameter-flow rate relationship model, the emitter output flow rate Q that meets the target emitter is selected. t Multiple candidate flow channel structure parameter combinations x i Each of the candidate flow channel structure parameter combinations x i Including the flow channel width W i Flow channel depth D i and the number of structural units N i ; S3: Using the Comprehensive Relative Index (RCAI) of the water emitter's anti-clogging performance as the evaluation model, the multiple candidate flow channel structure parameter combinations x selected in S2 are evaluated. i An evaluation is conducted, and the parameter combination that maximizes the RCAI value under preset constraints is determined as the optimal flow channel structure parameter combination. S4: Based on the optimal flow channel structure parameter combination determined in S3, a three-dimensional vortex wall washing optimization design is performed on the water emitter flow channel. The optimization design includes optimizing the arc of the water-facing side in the flow channel plane, adjusting the inclination angle of the back water side, and setting a bottom arc transition structure along the flow direction at the bottom of the flow channel. The optimization of the water-facing side arc includes controlling its arc radius and arc length so that the local fluid generates continuous and stable wall vortices at the turning point. The adjustment of the local inclination angle of the back water side couples the main fluid flow area with the near-wall vortex area, increasing the shear stress on the flow channel wall. The introduction of the bottom arc transition structure forms a second vortex core in the vertical direction, so that the horizontal two-dimensional vortex and the vertical bottom vortex are superimposed to form a three-dimensional wall washing structure. CFD is used to numerically simulate the flow channel structure formed at this time to determine whether it is within the predetermined flow range, and the structural parameters are adjusted according to the verification results. S5: For the water emitter with the completed flow channel structure design, the auxiliary structure is designed in conjunction with the auxiliary structure, which includes at least a patch blank area, an inlet grille and an outlet area; S6: The water emitter with the completed auxiliary structure design is processed and designed. The processing and design includes at least setting the indentation depth allowance and setting the overall shape boundary constraints to form the final finished water emitter configuration.
[0007] Preferably, the water emitter structural parameter-flow rate relationship model in S1 is in the form of a power function: in, Q This refers to the output flow rate of the water emitter. Flow coefficient; Work pressure, m; : Flow index; : Flow channel width; : Flow channel depth; The flow channel length is calculated using L = 2.56WN. Number of structural units; k These are the fitting coefficients for the flow model; α、β These are empirical parameters obtained through numerical simulation fitting.
[0008] Preferably, the formula for calculating the Comprehensive Relative Index (RCAI) of the anti-clogging performance of the water emitter in S3 is as follows: Where L is the flow channel length, calculated from L = 2.56WN. Number of structural units.
[0009] Preferably, the preset constraints in S3 include: (1) structural parameter-flow relationship constraints; (2) anti-clogging constraints: specifying the minimum width, minimum depth and minimum cross-sectional area thresholds of the flow channel; (3) overall configuration constraints: specifying the arrangement of the flow channel and its matching relationship with the overall external dimensions of the water emitter; (4) processing and manufacturing constraints: the minimum radius of the flow channel tooth tip R ≥ 0.06 mm.
[0010] Preferably, the three-dimensional vortex wall washing optimization design in S4 further includes checking the near-wall shear force τ of the optimized flow channel to ensure that the near-wall shear force τ satisfies: .
[0011] Preferably, the radius of the optimized arc on the water-facing surface in S4 is 0.5-1 times the channel width, i.e., 0.5WW.
[0012] Preferably, the bottom arc radius R of the bottom arc transition structure in S4 b It is 0.04-0.06mm.
[0013] Preferably, the design of the blank area of the patch in S5 includes: setting an unstructured edge on the outer edge of the water dispenser, wherein the size requirement of the unstructured edge is that the upper edge and the lower edge are both ≥0.7mm, and the left edge and the right edge are both ≥1.0mm.
[0014] Preferably, the design of the inlet bar in S5 includes: the width of the bar teeth is not less than 0.35mm, and the minimum flow area of a single hole of the inlet bar is not greater than twice the cross-sectional area of the flow channel, that is, not greater than 2×(W×D).
[0015] Preferably, the design of the outlet area in S5 includes: the connection angle between the end of the flow channel and the outlet hole is 40°-60°, and the corners of the outlet area are rounded, with the radius of the rounded corner being 0.4-0.6mm.
[0016] Preferably, the processing design in S6 includes: pre-reserved indentation depth, with a reserve of 0.05-0.08mm; and external boundary constraints, setting the overall width of the water dispenser to 6.0mm, the thickness to 2.1mm, and the length to ≤25.0mm, and the outer contour corners to adopt rounded transitions, with the radius of the rounded arc being ≥0.75mm.
[0017] A small, plate-type anti-clogging drip irrigation emitter, said emitter being manufactured by the design method described in any one of claims 1 to 11.
[0018] The beneficial effects of this invention patent are as follows: (1) This invention breaks through the limitations of existing technologies that only target local single-point improvements, and constructs a whole-process design method that takes the target flow rate as input and integrates parameter screening to structural forming, so that the design of water emitters can be transformed from experience trial and error to scientific quantification, which significantly improves design efficiency; (2) This invention proposes for the first time the quantitative control threshold of key geometric parameters such as channel width and depth, and constructs the comprehensive relative index RCAI evaluation model for anti-clogging performance, which provides a scientific basis for the accurate screening of water emitter structural parameters; (3) This invention comprehensively considers hydraulic performance, anti-clogging performance and processing and manufacturing constraints in the design stage, so that the design scheme takes into account both excellent performance and actual production process conditions, and ensures the smooth transformation of the product from design to manufacturing. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this 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 this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 A schematic diagram illustrating the entire design method for a small, flat, anti-clogging drip irrigation emitter. Figure 2 To simplify the design of the fractal M-channel; Figure 3 This is a schematic diagram of the extraction of near-wall shear force in the flow channel; Figure 4 A schematic diagram of the optimization of two-dimensional vortex wall washing; Figure 5 A schematic diagram showing the optimization of the bottom arc of the flow channel; Figure 6 Schematic diagram of constraints for blank areas in patch panel; Figure 7 Schematic diagram of the inlet grille design; Figure 8 Schematic diagram of the structural optimization of the outlet area; Figure 9Figure showing the CFD simulation results for optimizing the structure of the outlet area; Figure 10 This is a boundary constraint diagram of the overall shape of the water dispenser; Figure 11 Design a zone map for the irrigation system; Figure 12 Figure showing the simulation results after optimization of vortex wall washing; Figure 13 This is the overall design drawing of the optimal anti-clogging small plate sprinkler for a given flow rate. Detailed Implementation
[0021] The technical solution of this invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.
[0022] Example 1: Full-process design of a 0.8L / h target flow irrigation device like Figures 2-13 As shown, this embodiment takes the entire process design of a 0.8L / h target flow irrigation device as an example to illustrate the technical solution of the present invention in detail.
[0023] (a) Preliminary selection of flow channel parameter combination for water emitter under target flow conditions Set target design flow Q t =0.8L / h, with an allowable flow rate deviation range of ±5%. First, the basic geometric configuration of the irrigation emitter's flow channel is determined. The flow channel design of this invention is based on a simplified M-shaped fractal flow channel. A simplified M-shaped centerline is generated based on a second-order Minkowski curve. Upper and lower walls are formed by equidistant offsets along the normal to the fractal centerline, thereby obtaining the planar flow channel profile (e.g., ...). Figure 2 (As shown). The three-dimensional structure of the flow channel is constructed by extending it outward according to the channel depth setting. In order to reduce the local low-velocity stagnation zone, a circular arc transition structure is introduced at the tip of the channel tooth and the corner position. The local flow field forms a continuous vortex, which reduces particle deposition.
[0024] While maintaining the basic configuration of the fractal flow channel, the channel width W, depth D, and number of structural units N are selected as the main structural parameters. In this embodiment, a set of empirical relationship models between flow rate and structural parameters are obtained through numerical simulation fitting: Based on the above relational model, the structural parameters were inverted and searched, and several candidate combinations of structural parameters that meet the target flow requirements were initially selected, as shown in Table 1.
[0025] Table 1. Candidate flow channel structure parameter combinations for a target flow rate of 0.8 L / h (II) Optimal Design Model of Irrigator Flow Channel under Target Flow Rate Based on the candidate flow channel structural parameter combinations that meet the flow requirements, the Relative Comprehensive Index of Anti-clogging Performance of Water Dispensers (RCAI) is introduced as an evaluation index to compare and analyze the anti-clogging performance of different structural parameter combinations. This index is constructed based on long-term in-situ clogging experiments of multiple water dispenser samples and can reflect the relative sensitivity of different flow channel structural parameter combinations to particle deposition and clogging during actual operation.
[0026] The formula for calculating the Comprehensive Relative Index (RCAI) of the water emitter's anti-clogging performance is as follows: Where L = 2.56 WN.
[0027] Under the premise of satisfying the following preset constraints, the parameter combination with the largest RCAI value is selected as the optimal flow channel structure parameter combination: Anti-clogging constraints: Based on long-term in-situ clogging experiments of multiple irrigation emitter samples according to this invention, the following constraints are specified: channel width W ≥ 0.32 mm, channel depth D ≥ 0.31 mm, minimum channel cross-sectional area (W×D) ≥ 0.13 mm², and number of structural units 5 ≤ N ≤ 22; Overall configuration constraints: A double-row channel arrangement is adopted to shorten the overall length of the irrigation emitter; the minimum physical distance between channels and between channels and the inlet grid is not less than 0.7 mm; Manufacturing constraints: the minimum radius of curvature R of the channel tooth tip is ≥ 0.06 mm. Under the premise of satisfying the above constraints, the RCAI values of each candidate parameter combination are calculated, and the results are shown in Table 2.
[0028] Table 2 RCAI values of candidate flow channel structural parameter combinations After comprehensive comparison, the parameter combination with the highest RCAI value in this embodiment is the combination of a channel width of 0.40 mm, a channel depth of 0.38 mm, and 12 structural units (serial number 10). Based on this, this set of parameters is determined as the preferred combination of channel structure parameters under the target flow rate condition.
[0029] (III) Optimized design of three-dimensional vortex wall washing in the water dispenser channel After determining the optimal flow channel structure parameters, further fine structural optimization was carried out on the bottom and near-wall regions of the flow channel where deposition is prone to occur, and a three-dimensional vortex wall washing optimization design was introduced.
[0030] CFD numerical simulations were performed on the flow channel structure under these parameter combinations, and shear forces were extracted by taking points along the flow channel wall (e.g. Figure 3 As shown), ensure that the near-wall shear force is within a suitable range: When there is a risk of low-velocity stagnation or deposition in local areas of the channel, adjustments can be made to the upstream and downstream surfaces and the bottom structure of the channel to create a three-dimensional rotating flow state within the channel that is conducive to vortex wall washing. Specific optimizations are as follows: Two-dimensional vortex wall washing fine optimization: by replacing and optimizing the arc of the water-facing surface within the flow channel plane (e.g.) Figure 4 As shown, the radius and length of the arc are controlled to generate continuous and stable wall vortices at the turning point of the local fluid. Simultaneously, the local inclination angle of the backwater surface is adjusted to couple the main fluid flow area with the near-wall vortex area, increasing the shear stress on the channel wall. In this embodiment, the replacement radius of the arc on the upstream side is r = 0.23 mm (satisfying 0.5-1 times the channel width, i.e., 0.20-0.40 mm), and the counterclockwise rotation angle of the backwater surface is θ = 5°.
[0031] Bottom rounded corner optimization: Introduce a rounded transition at the bottom of the flow channel along the flow direction, replacing the original sharp bottom corner with a rounded corner (e.g., Figure 5 As shown), the radius of the bottom arc R b =0.05mm. By introducing the bottom arc, a second vortex core is formed vertically, so that the horizontal two-dimensional vortex and the vertical bottom vortex are superimposed to form a three-dimensional wall washing structure.
[0032] The aforementioned horizontal two-dimensional vortex and vertical bottom vortex superimpose and couple in space, causing the formation of a three-dimensional vortex flow state with distinct spatial characteristics inside the flow channel (such as...). Figure 12 As shown in the figure, this significantly weakens the low-velocity retention zone at the bottom and near the wall, increases the wall shear stress, and achieves a three-dimensional wall washing effect on the inner wall of the flow channel.
[0033] After determining the optimal structural parameters, the flow rate was checked using CFD simulation. The simulation results showed that the flow rate deviation met the requirements. Furthermore, the aforementioned three-dimensional vortex wall washing structure can effectively weaken the low-velocity retention zone, increase the near-wall flow intensity, and reduce the probability of particle deposition inside the flow channel.
[0034] (iv) Co-design of auxiliary structures for water dispensers After completing the design and optimization of the main flow channel structure, the auxiliary structures are further designed collaboratively from the perspective of overall engineering application, mainly including the following three areas: Design of the blank area for surface mount components: Under the conditions of multi-row flow channel arrangement and miniaturization design, if the blank area for surface mount components is too small, it will lead to problems such as insufficient machining accuracy of molds and copper electrodes, severe tooth tip wear, and insufficient hot pressing area for surface mount components. In this embodiment, based on the outer boundary of the water dispenser and the surface mount process requirements of the production line, an appropriate unstructured margin is set on the outer edge of the blank area for surface mount components (such as...). Figure 6 As shown in the figure, a continuous and stable welding interface is formed. The specific dimensional requirements are: the upper and lower margins are both ≥0.7mm, and the left and right margins are both ≥1.0mm.
[0035] Inlet bar design: This invention adopts a simplified bar structure, eliminating complex guide channels and retaining only the necessary bar teeth and transition cavities (such as...). Figure 7 (As shown). The overall width of the inlet grille is flush with the flow channel arrangement area to improve space utilization and simplify the mold structure. In this embodiment, the grille tooth width is 0.35mm, and the minimum flow area of the inter-tooth holes is designed to be 0.35mm × 0.77mm, which is less than twice the cross-sectional area of the fractal flow channel (2 × 0.40mm × 0.38mm). This allows larger particles to be intercepted at the grille, thereby protecting the flow channel from blockage.
[0036] Outlet area design: For the transition area between the end of the fractal flow channel and the outlet hole, this invention conducted numerical simulations of different outlet connection angles and different corner radii of the outlet area (e.g., Figure 8 , Figure 9 (As shown). Based on the simulation results, this embodiment sets the connection angle between the end of the fractal channel and the outlet hole at approximately 40° to ensure a smooth transition in the flow direction and reduce the possibility of a low-velocity stagnant zone forming near the outlet. Simultaneously, an arc structure with a radius of 0.5 mm is designed around the transition zone at the outlet to avoid sedimentation points and maintain the stability of the water outlet.
[0037] Through the above design, the outlet area of this embodiment can maintain a stable flow state, effectively reducing the risk of blockage in the outlet area.
[0038] (v) Watering device manufacturing and design After completing the design of the main flow channel and auxiliary structure of the irrigation device, we further planned and constrained the processing design of the irrigation device from the perspective of engineering implementation, so as to ensure that the designed irrigation device structure can be stably and accurately transformed into actual products.
[0039] Indentation depth reservation: In this embodiment, the reserved indentation depth is set to 0.06mm. During the design stage, the reserved flow channel depth compensation amount is used to make the actual effective flow channel depth after hot pressing close to the design value.
[0040] External boundary constraints: This embodiment limits the overall external dimensions of the water emitter (e.g., Figure 10 As shown, the dimensions of the irrigation emitter include its overall length, width, thickness, and outer contour rounded corners. The overall length of the emitter is set to 16mm, the width to 6.0mm, and the thickness to 2.1mm. To reduce the risk of sharp corners puncturing the drip irrigation tape and to improve the consistency of demolding and forming, the outer contour corners are rounded with a radius ≥ 0.75mm.
[0041] Under the aforementioned processing and design constraints, the overall configuration structure of the irrigation emitter was drawn using UG NX series software to obtain the optimal anti-clogging structure of the final irrigation emitter (e.g., Figure 13 (As shown).
[0042] (vi) Processing method of water dispenser After the overall structure of the irrigation emitter is finalized, the development and manufacturing of the irrigation emitter mold will proceed, specifically according to the following process: ① Mold core rough machining stage: Computer numerical control (CNC) is used to rough machine the mold core to complete the initial forming of the water inlet grid area and the outer contour, leaving sufficient allowance and positioning reference for subsequent fine machining; ② Molding electrode (copper electrode) processing stage: In view of the characteristics of the water dispenser, which has a large number of deep and narrow structures, sharp teeth and small radius arcs, high-precision CNC is used to manufacture copper electrodes to replace the traditional wire cutting method, so as to avoid the small teeth being cut off or dulled during processing. ③ Fine molding stage: The final molding of the small structure of the runner is completed by the fine molding process of electrical discharge machining, so that the mold cavity meets the requirements of injection molding.
[0043] Finally, a mold for the emitter at a given flow rate is formed. The emitter body is then injection molded using the completed mold. The emitter and drip tape are then sealed together by hot pressing to obtain the final 0.8L / h small-sized anti-clogging emitter drip tape product.
[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A complete process design method for a small, plate-type anti-clogging drip irrigation emitter, characterized in that, Includes the following steps: S1: Determine the basic geometric configuration of the irrigation emitter's flow channel, select the flow channel width W, depth D, and number of structural units N as the main structural parameters, obtain the rated outflow Q of each combination under standard pressure conditions through numerical simulation, form a data sample set corresponding to structural parameters and flow rates, and establish an irrigation emitter structural parameter-flow rate relationship model. S2: Based on the target emitter output flow rate Q t Using a preset emitter structure parameter-flow rate relationship model, the emitter output flow rate Q that meets the target emitter is selected. t Multiple candidate flow channel structure parameter combinations x i Each of the candidate flow channel structure parameter combinations x i Including the flow channel width W i Flow channel depth D i and the number of structural units N i ; S3: Using the Comprehensive Relative Index (RCAI) of the water emitter's anti-clogging performance as the evaluation model, the multiple candidate flow channel structural parameter combinations x selected in S2 are evaluated. i An evaluation is conducted, and the parameter combination that maximizes the RCAI value under preset constraints is determined as the optimal flow channel structure parameter combination. S4: Based on the optimal flow channel structure parameter combination determined in S3, a three-dimensional vortex wall washing optimization design is performed on the water emitter flow channel. The optimization design includes optimizing the arc of the water-facing side in the flow channel plane, adjusting the inclination angle of the back water side, and setting a bottom arc transition structure along the flow direction at the bottom of the flow channel. The optimization of the water-facing side arc includes controlling its arc radius and arc length so that the local fluid generates continuous and stable wall vortices at the turning point. The adjustment of the local inclination angle of the back water side couples the main fluid flow area with the near-wall vortex area, increasing the shear stress on the flow channel wall. The introduction of the bottom arc transition structure forms a second vortex core in the vertical direction, so that the horizontal two-dimensional vortex and the vertical bottom vortex are superimposed to form a three-dimensional wall washing structure. CFD is used to numerically simulate the flow channel structure formed at this time to determine whether it is within the predetermined flow range, and the structural parameters are adjusted according to the verification results. S5: For the water emitter with the completed flow channel structure design, the auxiliary structure is designed in conjunction with the auxiliary structure, which includes at least a patch blank area, an inlet grille and an outlet area; S6: The water emitter with the completed auxiliary structure design is processed and designed. The processing and design includes at least setting the indentation depth allowance and setting the overall shape boundary constraints to form the final finished water emitter configuration.
2. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The water emitter structural parameters-flow rate relationship model described in S1 is in the form of a power function: in, Q This refers to the output flow rate of the water emitter. Flow coefficient; Work pressure, m; : Flow index; : Flow channel width; : Flow channel depth; The flow channel length is calculated using L = 2.56WN. Number of structural units; k These are the fitting coefficients for the flow model; α、β These are empirical parameters obtained through numerical simulation fitting.
3. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The formula for calculating the Comprehensive Relative Index (RCAI) of the water emitter's anti-clogging performance in S3 is as follows: Where L is the flow channel length, calculated from L = 2.56WN. Number of structural units.
4. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The preset constraints mentioned in S3 include: (1) structural parameter-flow relationship constraints; (2) anti-clogging constraints: specifying the minimum width, minimum depth and minimum cross-sectional area thresholds of the flow channel; (3) overall configuration constraints: specifying the arrangement of the flow channel and its matching relationship with the overall external dimensions of the water dispenser; (4) processing and manufacturing constraints: the minimum radius of the flow channel tooth tip R ≥ 0.06 mm.
5. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The three-dimensional vortex wall washing optimization design described in S4 also includes checking the near-wall shear force τ of the optimized flow channel to ensure that the near-wall shear force τ satisfies: .
6. A complete process design method for a small-sized, anti-clogging drip irrigation emitter according to claim 1 or 5, characterized in that, The radius of the optimized arc on the water-facing surface described in S4 is 0.5-1.0 times the channel width, i.e., 0.5WW.
7. A complete process design method for a small-sized, anti-clogging drip irrigation emitter according to claim 1 or 5, characterized in that, The bottom arc radius R of the bottom arc transition structure described in S4 b It is 0.04-0.06mm.
8. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The design of the blank area for the patch in S5 includes: setting an unstructured edge on the outer edge of the water dispenser, wherein the size requirement for the unstructured edge is that the upper and lower edges are both ≥0.7mm, and the left and right edges are both ≥1.0mm.
9. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The design of the inlet bar described in S5 includes: the width of the bar teeth is not less than 0.35mm, and the minimum flow area of a single hole of the inlet bar is not greater than twice the cross-sectional area of the flow channel, that is, not greater than 2×(W×D).
10. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The design of the outlet area described in S5 includes: the connection angle between the end of the flow channel and the outlet hole is 40°-60°, and the corners of the outlet area are rounded with a radius of 0.4-0.6mm.
11. The whole-process design method of a small-sized anti-clogging drip irrigation emitter according to claim 1, characterized in that, The processing design described in S6 includes: reserved indentation depth, with a reserved amount of 0.05-0.08mm; external boundary constraints, setting the overall width of the water dispenser to 6.0mm, the thickness to 2.1mm, and the length to ≤25.0mm, and the outer contour corners to adopt rounded transitions, with the radius of the rounded arc ≥0.75mm.
12. A small, plate-type anti-clogging drip irrigation emitter, characterized in that, The watering device is manufactured by the design method according to any one of claims 1 to 11.