A clogging-resistant irrigation emitter based on crescent dune structure

Abstract

The application discloses a clogging-resistant water irrigator based on a crescent-shaped sand dune structure and belongs to the technical field of drip irrigation. The clogging-resistant water irrigator comprises a clogging-resistant labyrinth flow channel based on a crescent-shaped sand dune structure arranged on a water irrigator patch; the labyrinth flow channel is formed by a plurality of flow channel units connected in sequence; the flow channel unit is an axisymmetric structure and comprises a peach heart side structure, a crescent-shaped sand dune middle fractal structure, a water inlet straight flow section and a water outlet straight flow section; the peach heart side structure and the crescent-shaped sand dune middle fractal structure form a symmetrical bidirectional flow distribution flow channel; the crescent-shaped sand dune middle fractal structure is composed of a water-approaching gentle slope, a crescent end face and a water-back steep slope; the water-approaching gentle slope is convex, the water-back steep slope is concave, and the water-approaching gentle slope and the water-back steep slope are connected to form the crescent end face at the top; the water irrigator can make the particulate matter flow out of the water irrigator along with the water flow while consuming the water flow energy in an appropriate amount, the particulate matter is not easy to deposit and accumulate in the flow channel of the water irrigator, the water irrigator has high clogging resistance under the premise of guaranteeing the hydraulic performance.

Description

Technical Field

[0001] This invention belongs to the field of drip irrigation technology and relates to an anti-clogging irrigation device based on a crescent-shaped dune structure. Background Technology

[0002] Drip irrigation is one of the most water-saving irrigation methods in modern agriculture. The emitter, controlling the amount of water and the area of ​​wetting for each crop, is the core component of the drip irrigation system. When an emitter becomes clogged, the flow rate changes, leading to decreased irrigation uniformity and crop yield. If the emitter becomes completely clogged, the flow rate drops to zero, rendering the entire system unusable. Due to water scarcity and pollution, unconventional water sources such as reclaimed water, brackish water, and water with high sediment content are increasingly used for agricultural irrigation. Emitter clogging has become the most significant problem hindering the development of drip irrigation technology. The working characteristics of drip irrigation emitters mainly include hydraulic performance and anti-clogging performance. Both must meet usage requirements, but these two characteristics are contradictory. Prioritizing optimal hydraulic performance results in very poor anti-clogging performance, and vice versa. Therefore, for irrigation conditions with high sediment content, it is essential to design emitters with excellent anti-clogging performance while ensuring hydraulic performance. Summary of the Invention

[0003] This invention overcomes the shortcomings of existing technologies and proposes an anti-clogging irrigation device based on crescent-shaped dune structures. It draws inspiration from the crescent-shaped dune structures formed by desert winds to design a fractal structure with a central crescent-shaped dune, which is more suitable for irrigation conditions with high sand content. It aims to achieve high anti-clogging performance while ensuring hydraulic performance.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] An anti-clogging irrigation device based on a crescent-shaped dune structure includes an irrigation patch with an anti-clogging labyrinth flow channel based on the crescent-shaped dune structure. The anti-clogging labyrinth flow channel has an inlet and an outlet at both ends. The crescent-shaped dune structure anti-clogging labyrinth flow channel is composed of several flow channel units connected in series. Each flow channel unit has an axisymmetric structure, including a heart-shaped side structure, a crescent-shaped dune central fractal structure, an inlet direct flow section, and an outlet direct flow section. The crescent-shaped dune central fractal structure is located inside the heart-shaped side structure, and the heart-shaped side structure and the crescent-shaped dune central fractal structure form a symmetrical bidirectional diversion flow channel. The outlet direct flow section of the previous flow channel unit is connected to the inlet direct flow section of the next flow channel unit.

[0006] The crescent-shaped dune with its central fractal structure consists of a gentle slope facing the water, a crescent-shaped end face, and a steep slope facing away from the water. The gentle slope facing the water is convex, while the steep slope facing away from the water is concave. The slope of the gentle slope facing the water is less than that of the steep slope facing away from the water. The top of the gentle slope facing the water and the steep slope facing away from the water are connected to form the crescent-shaped end face.

[0007] Furthermore, the heart-shaped side structure is composed of two symmetrical, tangentially connected starting arc surfaces and turning arc surfaces.

[0008] Furthermore, the extended surfaces of the two turning arc surfaces of the heart-shaped side structure converge in the central region of the backwater slope depression of the crescent-shaped dune fractal structure.

[0009] Furthermore, the inlet and outlet direct-flow sections have the same structure and dimensions, and are rectangular stretch block structures.

[0010] Furthermore, the anti-clogging labyrinth flow channel based on the crescent-shaped dune structure also includes an arc transition section, which connects the direct outlet section of the flow channel unit before turning and the direct inlet section of the flow channel unit after turning, so that the anti-clogging labyrinth flow channel based on the crescent-shaped dune structure forms a turning structure.

[0011] Furthermore, the inlet is a grid-type inlet, and the outlet is a rectangular outlet; the first flow channel unit is connected to the grid-type inlet, and the last flow channel unit is connected to the rectangular outlet through a straight transition section.

[0012] Furthermore, the rectangular water outlet and the anti-clogging labyrinth flow channel based on the crescent-shaped dune structure are both located on the front of the anti-clogging water injector patch, while the grid-type water inlet is located on the back of the anti-clogging water injector patch.

[0013] Furthermore, the radius of the bottom arc of the gentle slope facing the water in the crescent-shaped dune with a fractal structure is 2~3mm, and the slope range is 50°~65°; the radius of the bottom arc of the steep slope facing the water is 1.5~2.5mm, and the slope range is 75°~85°; the radius of the inner and outer arc chord lengths of the crescent end face ranges from 0.9~1.1mm, the inner arc radius ranges from 0.6~0.8mm, and the outer arc radius ranges from 0.5~0.7mm.

[0014] Furthermore, the length of the flow channel unit ranges from 2 to 2.5 mm, and the width ranges from 1.8 to 2 mm; the width of the inlet and outlet direct flow sections ranges from 0.6 to 0.7 mm, the length ranges from 0.2 to 0.4 mm, and the depth ranges from 0.8 to 1 mm.

[0015] Furthermore, the radius of the starting arc surface of the heart-shaped side structure ranges from 2 to 3 mm, and the radius of the turning arc surface ranges from 0.4 to 0.5 mm.

[0016] The beneficial effects of this invention compared to the prior art are as follows:

[0017] This invention provides an anti-clogging irrigation device based on a crescent-shaped dune structure, adapted to irrigation conditions with high sediment content. The crescent-shaped dune structure formed by unidirectional wind flow in deserts naturally reduces wind resistance. Drawing inspiration from this phenomenon, a fractal structure is designed within the crescent-shaped dune to form an anti-clogging irrigation device with low resistance. The fractal structure within the crescent-shaped dune first divides a single water flow into two bidirectional flows, which then merge back into a single flow. When the bidirectional flows merge at the center of the steep back slope of the crescent-shaped dune, they have a scouring and energy-dissipating effect. While consuming a suitable amount of water flow energy, this irrigation device allows particulate matter to flow out of the device with the water flow, preventing particulate matter from depositing and accumulating inside the irrigation channel. This results in high anti-clogging performance while ensuring hydraulic performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the anti-clogging water injector patch based on the crescent-shaped dune structure described in this invention;

[0019] Figure 2 This is a schematic diagram of the bottom structure of the anti-clogging water injector patch based on the crescent-shaped dune structure described in this invention;

[0020] Figure 3 This is a schematic diagram of the solid structure of the anti-blockage labyrinth flow channel based on the crescent-shaped sand dune structure;

[0021] Figure 4 This is a schematic diagram of the physical structure of the anti-clogging water injector flow channel unit based on the crescent-shaped dune structure described in this invention;

[0022] Figure 5 This is a numerical simulation flow field velocity distribution diagram of the internal integral flow channel of the anti-clogging water injector based on the crescent-shaped sand dune structure described in the embodiment;

[0023] Figure 6 This is a numerical simulation flow field velocity distribution diagram of the internal flow channel unit of the anti-clogging water injector based on the crescent-shaped sand dune structure described in the embodiment;

[0024] Figure 7 This is a numerical simulation diagram of sand particle movement trajectory of the anti-clogging water injection device based on the crescent-shaped dune structure described in the embodiment;

[0025] Figure 8 The graph shows the pressure-flow rate relationship of the anti-clogging irrigation device based on the crescent-shaped dune structure described in the embodiment, where the horizontal axis represents the inlet working pressure of the irrigation device and the vertical axis represents the outlet flow rate of the irrigation device.

[0026] In the picture:

[0027] 1-Water emitter patch; 2-Rectangular outlet; 3-Grid-type inlet; 4-Anti-clogging labyrinth flow channel based on crescent-shaped dune structure; 5-Flow channel unit; 6-Circular arc turning section; 7-Straight transition section; 8-Heart-shaped side structure; 9-Centered fractal structure in crescent-shaped dune; 10-Direct water inlet section; 11-Direct water outlet section; 12-Starting arc surface; 13-Turning arc surface; 14-Graceful slope facing the water; 15-Crescent end face; 16-Steep slope facing the water. R t1 - Radius of the starting arc R t2 -Turn radius R y - Radius of the bottom arc of the gentle slope facing the water. α y - Gentle slope facing the water R b - Radius of the arc at the bottom of the steep back slope α b -Slope of the steep backwater slope R n -Inner radius of the crescent-shaped end face R w -Relative radius of the outer arc of the crescent end face L x - The inner and outer arc chord lengths of the crescent-shaped end face L -Length of the direct current section for water inlet W - Width of the direct current section for water inlet H - Flow channel depth. Detailed Implementation

[0028] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0029] like Figure 1 and 2As shown, this embodiment proposes an anti-clogging irrigation device based on a crescent-shaped dune structure. The anti-clogging irrigation device includes an irrigation patch 1 and a rectangular outlet 2, a grid-type inlet 3, and an anti-clogging labyrinth channel 4 based on the crescent-shaped dune structure disposed on the irrigation patch 1. The anti-clogging labyrinth channel 4 based on the crescent-shaped dune structure is composed of several channel units 5 connected in series. The rectangular outlet 2 and the anti-clogging labyrinth channel 4 based on the crescent-shaped dune structure are both located on the front side of the anti-clogging irrigation patch 1, and the grid-type inlet 3 is located on the back side of the anti-clogging irrigation patch 1. The first channel unit 5 of the anti-clogging labyrinth channel 4 based on the crescent-shaped dune structure is connected to the grid-type inlet 3, and the last channel unit 5 is connected to the rectangular outlet 2 through a straight transition section 7.

[0030] like Figure 3 and 4 The diagram shows the solid structure of the anti-clogging labyrinth flow channel 4 and flow channel unit 5 based on the crescent-shaped dune structure. This solid structure is a portion cut out from the water emitter patch for numerical simulation. As can be seen from the diagram, the flow channel unit 5 of the anti-clogging labyrinth flow channel 4 based on the crescent-shaped dune structure exhibits an axisymmetric design. Specifically, it consists of a heart-shaped side structure 8, a crescent-shaped dune central fractal structure 9, an inlet direct flow section 10, and an outlet direct flow section 11. The heart-shaped side structure 8 and the crescent-shaped dune central fractal structure 9 form a symmetrical bidirectional flow channel. The outlet direct flow section 11 of the previous flow channel unit 5 is connected to the inlet direct flow section 10 of the next flow channel unit 5.

[0031] like Figure 4 As shown, the heart-shaped side structure 8 is composed of two symmetrical, tangentially connected starting arc surfaces 12 and turning arc surfaces 13; the crescent-shaped dune central fractal structure 9 is composed of a gentle water-facing slope 14, a crescent-shaped end face 15, and a steep backwater slope 16. The gentle water-facing slope 14 is convex and rises relatively slowly, while the steep backwater slope 16 is concave and descends relatively steeply. The top of the gentle water-facing slope 14 and the steep backwater slope 16 are connected to form the crescent-shaped end face 15; the inlet direct flow section 10 and the outlet direct flow section 11 have the same structure and size, and are rectangular stretch block structures.

[0032] like Figure 3 and 4 As shown, the anti-clogging labyrinth flow channel 4 based on the crescent-shaped dune structure is composed of several flow channel units 5 connected in series. The turning of the anti-clogging labyrinth flow channel 4 based on the crescent-shaped dune structure is completed by the arc transition section 6. That is, the arc transition section 6 connects the water outlet direct flow section 11 of the flow channel unit 5 before the turning and the water inlet direct flow section 10 of the flow channel unit 5 after the turning, thereby forming a left-opening U-shaped anti-clogging labyrinth flow channel 4 based on the crescent-shaped dune structure. The water flow directions in the anti-clogging labyrinth flow channels on both sides of the arc transition section 6 are opposite.

[0033] like Figure 4As shown, the radius of the starting arc surface 12 of the heart-shaped side structure 8 is... R t1 The range is 2~3mm, and the radius of the turning arc surface is 13. R t2 The range is 0.4~0.5mm; the radius of the bottom arc of the gentle slope 14 of the crescent-shaped dune with fractal structure 9 is... R y The range is 2~3mm, slope α y The range is 50°~65°, and the bottom arc radius of the steep back slope is 16. R b The range is 1.5~2.5mm, slope α b The range is 75°~85°, and the inner and outer arc chord lengths of the crescent end face are 15. L x The range is 0.9~1.1mm, inner arc radius R n The range is 0.6~0.8mm, outer arc radius R w The range is 0.5~0.7mm; the width of the water inlet direct flow section 10 of the flow channel unit 5 is... W The range is 0.6~0.7mm, length L The range is 0.2~0.4mm, and the depth is... H The range is 0.8~1mm; the length of the flow channel unit 5 ranges from 2 to 2.5mm, and the width ranges from 1.8 to 2mm.

[0034] like Figure 3 and 4 As shown, the grid-type water inlet 3 can effectively intercept impurities in the drip irrigation tape from entering the emitter, thus acting as a filter. The crescent-shaped dune fractal structure 9 in the anti-clogging emitter channel unit is designed based on the crescent-shaped dune structure formed by desert wind flow. The rising arc surface 12 of the heart-shaped side structure 8 and the water-facing gentle slope 14 of the crescent-shaped dune fractal structure 9 can effectively guide the bidirectional flow of water. The turning arc surface 13 of the heart-shaped side structure 8 can effectively guide the bidirectional water flow to collide and merge in the central area of ​​the back slope of the crescent-shaped dune fractal structure 9. While consuming the water flow capacity, it makes the water flow in the channel smoother and flushes the back slope of the crescent-shaped dune fractal structure 9, avoiding the accumulation of particulate matter.

[0035] Based on the above scope, this invention embodiment is illustrated using a specific design dimension as an example. It employs 22 flow channel units 5 to construct an anti-clogging labyrinth flow channel 4 based on a crescent-shaped dune structure; the radius of the starting arc surface 12 of the heart-shaped side structure 8... R t1It is 2.5mm, and the radius of the turning arc surface is 13. R t2 The radius of the bottom arc of the crescent-shaped dune with fractal structure 9 in the center is 0.45 mm. R y It is 2.5mm, slope α y The angle is 61.6°, and the radius of the bottom arc of the steep back slope 16 is... R b It is 1.5mm, slope α b The angle is 79.6°, and the chord lengths of the inner and outer arcs of the crescent face are... L x The inner radius is 1mm. R n The outer radius is 0.6mm. R w The width of the direct-flow section 10 of the flow channel unit 5 is 0.6 mm. W It is 0.65mm in length. L 0.2mm, depth H The length of the flow channel unit 5 is 2.25 mm and the width is 2 mm; the inner radius of the arc transition section 6 is 2.4 mm and the outer radius of the arc is 3 mm; the width of the circular transition section 7 is 0.65 mm, the length is 1.8 mm and the depth is 1 mm.

[0036] like Figure 5 and Figure 6 As shown, this invention numerically models the anti-clogging irrigation device based on the crescent-shaped dune structure described in the preferred embodiment, and simulates and analyzes the fluid movement inside the irrigation device. This is achieved through observation... Figure 5 and Figure 6 It is known that each flow channel unit 5 of the water emitter includes a confluence expansion section, a bidirectional diversion and contraction section, and a bidirectional diversion and collision confluence section, which gradually consumes the energy of the water flow. The high-speed fluid zone inside the water emitter occupies most of the flow channel area. There are two reverse vortices in the back slope 16 area of ​​the fractal structure 9 in the crescent dune. However, the two reverse vortices are very close to the mainstream high-speed zone, and the two reverse vortices scour the back slope 16 of the fractal structure 9 in the crescent dune, which does not easily lead to the accumulation of particulate matter, thereby improving the anti-clogging performance of the water emitter.

[0037] like Figure 7As shown, the present invention simulated the particle movement trajectory within the flow channel of the anti-clogging irrigation device based on the crescent-shaped dune structure described in the preferred embodiment. It was found that the particles can flow out of the maze flow channel with the water flow in a short time. After colliding with the arc wall of the heart-shaped side structure 8 and the water-facing gentle slope of the crescent-shaped dune fractal structure 9 in the flow channel unit 5, the particles enter the next flow channel unit without stagnating in the central area of ​​the back slope 16 of the crescent-shaped dune fractal structure 9. This indicates that the anti-clogging irrigation device based on the crescent-shaped dune structure described in the present invention has a high particle throughput rate, that is, the irrigation device described in the present invention has a strong anti-clogging capability.

[0038] like Figure 8 As shown, the present invention obtained the pressure-flow relationship curve through numerical simulation of the anti-clogging irrigation device based on the crescent-shaped dune structure described in the preferred embodiment. Figure 8 The horizontal axis represents the working pressure at the inlet of the water dispenser. P (kPa), with the vertical axis representing the water flow rate from the emitter. Q (L / h) yields a flow index of 0.5041, which meets the hydraulic performance requirements of the sprinkler.

[0039] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all of these should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A clog-resistant irrigation device based on a crescent-shaped dune structure, characterized in that, The device includes a water-repellent patch (1), which is equipped with an anti-clogging labyrinth flow channel (4) based on a crescent-shaped dune structure. The anti-clogging labyrinth flow channel (4) based on the crescent-shaped dune structure has an inlet and an outlet at both ends. The anti-clogging labyrinth flow channel (4) based on the crescent-shaped dune structure is composed of several flow channel units (5) connected in series. The flow channel unit (5) is an axisymmetric structure, including a heart-shaped side structure (8), a crescent-shaped dune central fractal structure (9), an inlet direct flow section (10), and an outlet direct flow section (11). The crescent-shaped dune central fractal structure (9) is located inside the heart-shaped side structure (8). The heart-shaped side structure (8) and the crescent-shaped dune central fractal structure (9) form a symmetrical bidirectional diversion flow channel. The outlet direct flow section (11) of the previous flow channel unit (5) is connected to the inlet direct flow section (10) of the next flow channel unit (5). The crescent-shaped dune with a fractal structure (9) consists of a gentle slope facing the water (14), a crescent-shaped end face (15), and a steep slope facing away from the water (16). The gentle slope facing the water (14) is convex, and the steep slope facing away from the water (16) is concave. The slope of the gentle slope facing the water (14) is smaller than the slope of the steep slope facing away from the water (16). The top of the gentle slope facing the water (14) and the steep slope facing away from the water (16) are connected to form the crescent-shaped end face (15). The heart-shaped side structure (8) is composed of two symmetrical and tangentially connected starting arc surfaces (12) and turning arc surfaces (13); the extension surfaces of the two turning arc surfaces (13) of the heart-shaped side structure (8) converge in the central area of ​​the depression of the back slope (16) of the crescent-shaped dune fractal structure (9); there are two opposing vortices in the back slope (16) area of ​​the crescent-shaped dune fractal structure (9), and the two opposing vortices scour the back slope (16) of the crescent-shaped dune fractal structure (9); The bottom arc radius of the gentle slope (14) of the crescent-shaped dune with a fractal structure (9) is 2~3mm, and the slope range is 50°~65°. The bottom arc radius of the steep slope (16) is 1.5~2.5mm, and the slope range is 75°~85°. The inner and outer arc chord length radii of the crescent end face (15) range from 0.9~1.1mm, the inner arc radius ranges from 0.6~0.8mm, and the outer arc radius ranges from 0.5~0.7mm. The length of the flow channel unit (5) ranges from 2 to 2.5 mm, and the width ranges from 1.8 to 2 mm; the width of the inlet direct flow section (10) and the outlet direct flow section (11) ranges from 0.6 to 0.7 mm, the length ranges from 0.2 to 0.4 mm, and the depth ranges from 0.8 to 1 mm. The radius of the starting arc surface (12) of the heart-shaped side structure (8) is 2~3mm, and the radius of the turning arc surface (13) is 0.4~0.5mm.

2. The anti-clogging irrigation device based on a crescent-shaped dune structure according to claim 1, characterized in that, The inlet direct flow section (10) and outlet direct flow section (11) have the same structure and size, and are rectangular stretch block structures.

3. The anti-clogging irrigation device based on a crescent-shaped dune structure according to claim 1, characterized in that, The anti-clogging labyrinth flow channel (4) based on the crescent-shaped dune structure also includes an arc transition section (6), which connects the outflow direct flow section (11) of the flow channel unit (5) before turning and the inflow direct flow section (10) of the flow channel unit (5) after turning, so that the anti-clogging labyrinth flow channel (4) based on the crescent-shaped dune structure forms a turning structure.

4. The anti-clogging irrigation device based on a crescent-shaped dune structure according to claim 1, characterized in that, The inlet is a grid-type inlet (3), and the outlet is a rectangular outlet (2); the first flow channel unit (5) is connected to the grid-type inlet (3), and the last flow channel unit (5) is connected to the rectangular outlet (2) through a straight transition section (7).

5. The anti-clogging irrigation device based on a crescent-shaped dune structure according to claim 4, characterized in that, The rectangular outlet (2) and the anti-clogging labyrinth flow channel (4) based on the crescent-shaped dune structure are both located on the front of the anti-clogging water injector patch (1), and the grid-type inlet (3) is located on the back of the anti-clogging water injector patch (1).

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