Anti-blocking irrigation emitter based on crescent dune structure

Abstract

The invention discloses an anti-blocking irrigation emitter based on a crescent dune structure, and belongs to the technical field of drip irrigation. Comprising an anti-blocking labyrinth runner based on a crescent dune structure, wherein the anti-blocking labyrinth runner is arranged on an irrigation emitter patch; the labyrinth flow channel is formed by sequentially connecting a plurality of flow channel units in series; each flow channel unit is of an axial symmetry structure and comprises a peach heart side structure, a crescent 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 dune centrally-arranged fractal structure form symmetrical two-way shunting runners; the crescent dune middle fractal structure is composed of an upstream gentle slope, a crescent end face and a downstream steep slope, the upstream gentle slope protrudes, the downstream steep slope is sunken, and the upstream gentle slope and the downstream steep slope are connected with the top to form the crescent end face. According to the irrigation emitter, particulate matter can flow out of the irrigation emitter along with water flow while a proper amount of water flow energy is consumed, the particulate matter is not prone to deposition and accumulation in a flow channel of the irrigation emitter, and the high anti-blocking performance is achieved on the premise that the hydraulic performance is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of drip irrigation and relates to an anti-blocking irrigation device based on a crescent-shaped sand dune structure. Background Art

[0002] Drip irrigation is one of the most water-saving irrigation methods in modern agricultural irrigation. The emitter controls the irrigation water volume and wetted area of ​​each crop and is the core component of the drip irrigation system. When the emitter is blocked, the flow of the emitter changes, resulting in a decrease in the uniformity of the drip irrigation system and a decrease in crop yield. Once the emitter is completely blocked, the flow of the emitter is 0, causing the entire drip irrigation system to be scrapped. Affected by water shortage and water resource environmental pollution, unconventional water sources such as recycled water, brackish water, and high-sand water are gradually used as agricultural irrigation water sources. Emitter blockage has become the most important problem restricting the development of current drip irrigation technology. The working characteristics of drip irrigation emitters mainly include hydraulic performance and anti-blocking performance. Both must meet the use requirements, but these two characteristics are contradictory. When the hydraulic performance is pursued to the extreme, its anti-blocking performance will be very poor, and when the anti-blocking performance is pursued to the extreme, its hydraulic performance will be very poor. Therefore, for the irrigation conditions of high-sand water, it is very necessary to design an emitter with excellent anti-blocking performance while ensuring hydraulic performance. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and proposes an anti-clogging irrigation device based on a crescent-shaped sand dune structure. The crescent-shaped sand dune structure formed by desert wind flow is used to design a fractal structure in the middle of the crescent-shaped sand dune, which is more suitable for irrigation conditions with high sand content water. It is committed to having high anti-clogging performance while ensuring hydraulic performance.

[0004] In order to achieve the above object, the present invention is achieved through the following technical solutions: An anti-clogging sprinkler based on a crescent-shaped sand dune structure comprises a sprinkler patch, wherein the sprinkler patch is provided with an anti-clogging labyrinth flow channel based on a crescent-shaped sand dune structure, and a water inlet and a water outlet are respectively arranged at both ends of the anti-clogging labyrinth flow channel based on the crescent-shaped sand dune structure; the anti-clogging labyrinth flow channel based on the crescent-shaped sand dune structure is formed by a plurality of flow channel units connected in series in sequence; the flow channel unit is an axisymmetric structure, comprising a heart-shaped side structure, a crescent-shaped sand dune middle-placed fractal structure, a water inlet direct flow section and a water outlet direct flow section; the crescent-shaped sand dune middle-placed fractal structure is located on the inner side of the heart-shaped side structure, and the heart-shaped side structure and the crescent-shaped sand dune middle-placed fractal structure form a symmetrical bidirectional diversion flow channel; the water outlet direct flow section of the previous flow channel unit is connected to the water inlet direct flow section of the next flow channel unit; The crescent-shaped sand dune mid-fractal structure is composed of a gentle slope facing the water, a crescent end face and a steep slope facing away from the water. The gentle slope facing the water is convex, the steep slope facing away from the water is concave, and the slope of the gentle slope facing the water is smaller than that of the steep slope facing away from the water. The tops of the gentle slope facing the water and the steep slope facing away from the water are connected to form a crescent end face.

[0005] Furthermore, the peach heart side structure is composed of two symmetrical tangentially connected starting arc surfaces and a turning arc surface.

[0006] Furthermore, the extended surfaces of the two turning arc surfaces of the heart-shaped side structure intersect in the central area of ​​the backwater steep slope depression of the fractal structure in the crescent-shaped sand dune.

[0007] Furthermore, the water inlet direct flow section and the water outlet direct flow section have the same structure and size, and are rectangular tensile block structures.

[0008] Furthermore, the anti-clogging maze flow channel based on the crescent-shaped dune structure also includes an arc transition section, which connects the outlet straight section of the flow channel unit before the turn and the inlet straight section of the flow channel unit after the turn, so that the anti-clogging maze flow channel based on the crescent-shaped dune structure forms a turning structure.

[0009] Furthermore, the water inlet is a grid-type water inlet, and the water outlet is a rectangular water outlet; the first flow channel unit is connected to the grid-type water inlet, and the last flow channel unit is connected to the rectangular water outlet through a straight transition section.

[0010] Furthermore, the rectangular water outlet and the anti-clogging maze flow channel based on the crescent-shaped sand dune structure are both located on the front side of the anti-clogging sprinkler patch, and the grid-type water inlet is located on the back side of the anti-clogging sprinkler patch.

[0011] Furthermore, the arc radius of the bottom of the gentle slope facing the water in the middle of the fractal structure of the crescent-shaped sand dune is 2~3mm, the slope range is 50°~65°, the arc radius of the bottom of the steep slope facing away from the water is 1.5~2.5mm, the slope range is 75°~85°; the chord length radius of the inner and outer arcs 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.

[0012] Furthermore, the length range of the flow channel unit is 2~2.5mm, and the width range is 1.8~2mm; the width range of the water inlet straight section and the water outlet straight section is 0.6~0.7mm, the length range is 0.2~0.4mm, and the depth range is 0.8~1mm.

[0013] Furthermore, the radius of the starting arc surface of the heart-shaped side structure is in the range of 2-3 mm, and the radius of the turning arc surface is in the range of 0.4-0.5 mm.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: The present invention provides an anti-clogging irrigator based on a crescent-shaped dune structure suitable for irrigation conditions with high sand content. The crescent-shaped dune structure formed by unidirectional wind flow in natural deserts has the effect of reducing wind resistance. Drawing on this phenomenon, a fractal structure is designed in the middle of the crescent-shaped dune to form an anti-clogging irrigator based on the crescent-shaped dune structure. The irrigator has relatively small resistance. The fractal structure in the middle of the crescent-shaped dune divides a single water flow into two-way water flows and then merges them into a single water flow. When the two-way water flows merge in the central area of ​​the steep backwater slope of the fractal structure in the crescent-shaped dune, they have the effect of scouring and consuming energy. The irrigator can make particles flow out of the irrigator with the water flow while consuming water flow energy in an appropriate amount. The particles are not easy to deposit and accumulate inside the flow channel of the irrigator. The irrigator has high anti-clogging performance under the premise of ensuring hydraulic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the anti-clogging irrigator patch based on the crescent-shaped sand dune structure of the present invention; Figure 2 It is a schematic diagram of the bottom structure of the anti-clogging irrigator patch based on the crescent-shaped sand dune structure of the present invention; Figure 3 It is a schematic diagram of the physical structure of the anti-blocking maze flow channel based on the crescent-shaped sand dune structure; Figure 4 It is a schematic diagram of the entity structure of the flow channel unit of the anti-clogging emitter based on the crescent-shaped sand dune structure of the present invention; Figure 5 is a velocity distribution diagram of the flow field of the whole flow channel of the anti-clogging irrigator based on the crescent-shaped sand dune structure described in the embodiment; Figure 6 is a numerical simulation flow field velocity distribution diagram of a partial flow channel unit inside the anti-clogging irrigator based on the crescent-shaped sand dune structure described in the embodiment; Figure 7 is a numerical simulation sand particle movement trajectory diagram of the anti-clogging irrigator based on the crescent-shaped sand dune structure described in the embodiment; Figure 8 3 is a pressure-flow relationship curve diagram of the anti-clogging emitter based on the crescent-shaped sand dune structure described in the embodiment, wherein the abscissa is the emitter inlet working pressure and the ordinate is the emitter outlet flow.

[0016] In the figure: 1-irrigator patch, 2-rectangular outlet, 3-grid inlet, 4-anti-blocking maze flow channel based on crescent-shaped dune structure, 5-flow channel unit, 6-arc turning section, 7-straight transition section, 8-heart-shaped side structure, 9-crescent-shaped dune center fractal structure, 10-water inlet straight section, 11-water outlet straight section, 12-starting arc surface, 13-turning arc surface, 14-water-facing gentle slope, 15-crescent end surface, 16-backwater steep slope, Rt1 - radius of the starting arc, R t2 - Radius of the turning arc, R y -The radius of the bottom arc of the gentle slope facing the water, α y - Gentle slope facing the water, R b -The radius of the arc at the bottom of the steep backwater slope, α b - The slope of the steep backwater slope, R n -The radius of the inner arc of the crescent end face, R w -The radius of the outer arc of the crescent end surface, L x -The length of the inner and outer arc chords of the crescent end face, L - Length of the straight section into the water, W -Width of the straight section into the water, H - Flow channel depth. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0018] like Figure 1 and 2 As shown, this embodiment proposes an anti-clogging sprinkler based on a crescent-shaped sand dune structure, the anti-clogging sprinkler comprises a sprinkler patch 1 and a rectangular water outlet 2, a grid-type water inlet 3 and an anti-clogging maze flow channel 4 based on a crescent-shaped sand dune structure arranged on the sprinkler patch 1; the anti-clogging maze flow channel 4 based on the crescent-shaped sand dune structure is composed of a plurality of flow channel units 5 connected in series; the rectangular water outlet 2 and the anti-clogging maze flow channel 4 based on the crescent-shaped sand dune structure are both located on the front side of the anti-clogging sprinkler patch 1, and the grid-type water inlet 3 is located on the back side of the anti-clogging sprinkler patch 1; the first flow channel unit 5 of the anti-clogging maze flow channel 4 based on the crescent-shaped sand dune structure is connected to the grid-type water inlet 3, and the last flow channel unit 5 is connected to the rectangular water outlet 2 through a straight transition section 7.

[0019] like Figure 3 and 4As shown, it is a physical structure diagram of the anti-clogging maze flow channel 4 and the flow channel unit 5 based on the crescent-shaped sand dune structure. The entity is a part cut out from the sprinkler patch and is used for numerical simulation. It can be seen from the figure that the flow channel unit 5 of the anti-clogging maze flow channel 4 based on the crescent-shaped sand dune structure presents an axisymmetric design, specifically composed of a heart-shaped side structure 8, a fractal structure 9 in the middle of the crescent-shaped sand dune, a water inlet direct current section 10 and a water outlet direct current section 11. The heart-shaped side structure 8 and the fractal structure 9 in the middle of the crescent-shaped sand dune form a symmetrical two-way diversion flow channel, and the water outlet direct current section 11 of the previous flow channel unit 5 is connected to the water inlet direct current section 10 of the next flow channel unit 5.

[0020] like Figure 4 As shown, the peach-shaped side structure 8 is composed of two symmetrical, tangentially connected starting arc surfaces 12 and a turning arc surface 13; the crescent-shaped sand dune center fractal structure 9 is composed of a water-facing gentle slope 14, a crescent end face 15 and a water-back steep slope 16. The water-facing gentle slope 14 is convex and climbs slowly, and the water-back steep slope 16 is concave and descends steeply. The water-facing gentle slope 14 and the water-back steep slope 16 are connected at the top to form a crescent end face 15; the water inlet direct current section 10 and the water outlet direct current section 11 have the same structure and size, and are rectangular tensile block structures.

[0021] like Figure 3 and 4 As shown, the anti-clogging labyrinth flow channel 4 based on the crescent-shaped sand dune structure is composed of a plurality of flow channel units 5 connected in series in sequence, and the turning of the anti-clogging labyrinth flow channel 4 based on the crescent-shaped sand dune structure is completed by the circular arc transition section 6, that is, the circular arc transition section 6 connects the outlet straight section 11 of the flow channel unit 5 before the turning and the inlet straight section 10 of the flow channel unit 5 after the turning, thereby forming a left-open U-shaped anti-clogging labyrinth flow channel 4 based on the crescent-shaped sand dune structure, and the water flow directions in the anti-clogging labyrinth flow channels on both sides of the circular arc transition section 6 are opposite.

[0022] like Figure 4 As shown, the radius of the starting arc surface 12 of the peach heart side structure 8 is R t1 Range is 2~3mm, turning arc surface 13 radius R t2 The range is 0.4~0.5mm; the bottom arc radius of the water-facing gentle slope 14 of the crescent-shaped sand dune fractal structure 9 R y The range is 2~3mm, the slope α y The range is 50°~65°, the bottom arc radius of the steep slope is 16 R b The range is 1.5~2.5mm, the slope α b The range is 75°~85°, the inner and outer arc chord length of the crescent end face is 15L x The range is 0.9~1.1mm, the inner arc radius R n The range is 0.6~0.8mm, the outer arc radius R w The range is 0.5~0.7mm; the width of the water inlet straight section 10 of the flow channel unit 5 W The range is 0.6~0.7mm, length L The range is 0.2~0.4mm, depth H The range is 0.8~1mm; the length range of the flow channel unit 5 is 2~2.5mm, and the width range is 1.8~2mm.

[0023] like Figure 3 and 4 As shown, the grid-type water inlet 3 can effectively intercept impurities in the drip irrigation belt from entering the emitter, and play a filtering role; the crescent-shaped dune center fractal structure 9 in the anti-blocking emitter flow channel unit is designed with reference to the crescent-shaped dune structure formed by desert wind flow, and the starting arc surface 12 of the heart-shaped side structure 8 and the water-facing gentle slope 14 of the crescent-shaped dune center fractal structure 9 can effectively guide the water flow to be diverted in two directions, and the turning arc surface 13 of the heart-shaped side structure 8 can effectively guide the two-way water flow to collide and merge in the central area of ​​the backwater steep slope of the crescent-shaped dune center fractal structure 9, which consumes the water flow capacity while making the water flow in the flow channel smoother, and washes the backwater steep slope of the crescent-shaped dune center fractal structure 9 to avoid the accumulation of particulate matter.

[0024] The embodiment of the present invention is described by taking a specific design size as an example based on the above range, using 22 flow channel units 5 to form an anti-blocking maze flow channel 4 based on a crescent-shaped sand dune structure; the radius of the starting arc surface 12 of the peach heart side structure 8 is R t1 2.5mm, turning arc surface 13 radius R t2 0.45mm; the bottom arc radius of the water-facing gentle slope 14 of the fractal structure 9 in the crescent-shaped sand dune R y 2.5mm, slope α y The bottom arc radius of the steep slope 16 is 61.6°. R b 1.5mm, slope α b is 79.6°, and the chord length of the inner and outer arcs of the crescent end face is L x The inner arc radius is 1mm R n 0.6mm, outer arc radius Rw The width of the water inlet straight section 10 of the flow channel unit 5 is 0.6mm; W 0.65mm, length L 0.2mm, depth H The length of the flow channel unit 5 is 2.25mm and the width is 2mm; the inner arc radius of the arc transition section 6 is 2.4mm and the outer arc radius is 3mm; the width of the circular line transition section 7 is 0.65mm, the length is 1.8mm and the depth is 1mm.

[0025] like Figure 5 and Figure 6 As shown, the present invention numerically models the anti-clogging sprinkler based on the crescent-shaped dune structure described in the preferred embodiment, simulates and analyzes the movement of the fluid inside the sprinkler, and observes Figure 5 and Figure 6 It can be seen that each flow channel unit 5 of the emitter includes a confluence expansion section, a two-way divergence tapering section and a two-way divergence collision confluence section, which gradually consumes water flow energy; the high-speed area of ​​the fluid inside the emitter occupies most of the flow channel, and there are two reverse vortices in the backwater steep slope 16 area of ​​the fractal structure 9 in the crescent-shaped sand dune, but the two reverse vortices are very close to the mainstream high-speed area, and the two reverse vortices flush the backwater steep slope 16 of the fractal structure 9 in the crescent-shaped sand dune, which is not easy to cause accumulation of particulate matter, thereby improving the anti-clogging performance of the emitter.

[0026] like Figure 7 As shown, the present invention simulates the particle movement trajectory in the flow channel of the anti-clogging sprinkler based on the crescent-shaped dune structure described in the preferred example, and finds that the particles can flow out of the maze flow channel with the water flow in a relatively short time. The particles collide with the arc wall surface of the heart-shaped side structure 8 and the water-facing gentle slope of the fractal structure 9 in the crescent-shaped dune in the flow channel unit 5 and then enter the next flow channel unit, without stagnating in the central area of ​​the backwater steep slope 16 of the fractal structure 9 in the crescent-shaped dune. This shows that the anti-clogging sprinkler based on the crescent-shaped dune structure described in the present invention has a higher particle passing rate, that is, the sprinkler described in the present invention has a strong anti-clogging ability.

[0027] like Figure 8 As shown, the present invention obtains a pressure-flow relationship curve diagram by numerical simulation of the anti-clogging irrigator based on the crescent-shaped sand dune structure described in the preferred embodiment, Figure 8 The horizontal axis is the working pressure of the emitter inlet P (kPa), the ordinate is the water flow rate of the emitter Q (L / h), the flow index can be obtained as 0.5041, which meets the hydraulic performance requirements of the emitter.

[0028] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. An anti-clogging sprinkler based on a crescent-shaped sand dune structure, characterized in that: The invention comprises an emitter patch (1), wherein the emitter patch (1) is provided with an anti-clogging maze flow channel (4) based on a crescent-shaped sand dune structure, and the anti-clogging maze flow channel (4) based on the crescent-shaped sand dune structure is provided with a water inlet and a water outlet at both ends respectively; the anti-clogging maze flow channel (4) based on the crescent-shaped sand dune structure is composed of a plurality of flow channel units (5) connected in series in sequence; the flow channel unit (5) is an axisymmetric structure, comprising a heart-shaped side structure (8), a crescent-shaped sand dune middle fractal structure (9), a water inlet direct flow section (10) and a water outlet direct flow section (11); the crescent-shaped sand dune middle fractal structure (9) is located on the inner side of the heart-shaped side structure (8), and the heart-shaped side structure (8) and the crescent-shaped sand dune middle fractal structure (9) form a symmetrical bidirectional diversion flow channel; the water outlet direct flow section (11) of the previous flow channel unit (5) is connected to the water inlet direct flow section (10) of the next flow channel unit (5); The crescent-shaped sand dune mid-mounted fractal structure (9) is composed of a water-facing gentle slope (14), a crescent end face (15) and a water-back steep slope (16); the water-facing gentle slope (14) is convex, the water-back steep slope (16) is concave, and the slope of the water-facing gentle slope (14) is smaller than the slope of the water-back steep slope (16); the water-facing gentle slope (14) and the water-back steep slope (16) are connected at the top to form the crescent end face (15).

2. The anti-clogging sprinkler based on the crescent-shaped sand dune structure according to claim 1 is characterized in that: The heart-shaped side structure (8) is composed of two symmetrical, tangentially connected starting arc surfaces (12) and a turning arc surface (13).

3. The anti-clogging sprinkler based on the crescent-shaped sand dune structure according to claim 2 is characterized in that: The extended surfaces of the two turning arc surfaces (13) of the heart-shaped side structure (8) intersect at the concave central area of ​​the backwater steep slope (16) of the fractal structure (9) in the crescent-shaped sand dune.

4. The anti-clogging sprinkler based on a crescent-shaped sand dune structure according to claim 1, characterized in that: The water inlet straight flow section (10) and the water outlet straight flow section (11) have the same structure and size and are rectangular tensile block structures.

5. The anti-clogging sprinkler based on a crescent-shaped sand dune structure according to claim 1, characterized in that: The anti-clogging labyrinth flow channel (4) based on the crescent-shaped sand dune structure further comprises an arc transition section (6), which connects the outlet straight flow section (11) of the flow channel unit (5) before the turn and the inlet straight flow section (10) of the flow channel unit (5) after the turn, so that the anti-clogging labyrinth flow channel (4) based on the crescent-shaped sand dune structure forms a turn structure.

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

7. The anti-clogging sprinkler based on a crescent-shaped sand dune structure according to claim 6, characterized in that: The rectangular water outlet (2) and the anti-clogging maze flow channel (4) based on the crescent-shaped sand dune structure are both located on the front side of the anti-clogging water emitter patch (1), and the grid-type water inlet (3) is located on the back side of the anti-clogging water emitter patch (1).

8. The anti-clogging sprinkler based on a crescent-shaped sand dune structure according to claim 1, characterized in that: The bottom arc radius of the gentle slope (14) facing the water of the fractal structure (9) in the crescent-shaped sand dune is 2-3 mm, and the slope range is 50°-65°. The bottom arc radius of the steep slope (16) facing the water is 1.5-2.5 mm, and the slope range is 75°-85°. The chord length radius of the inner and outer arcs of the crescent end face (15) ranges from 0.9 to 1.1 mm, the inner arc radius ranges from 0.6 to 0.8 mm, and the outer arc radius ranges from 0.5 to 0.7 mm.

9. The anti-clogging sprinkler based on a crescent-shaped sand dune structure according to claim 4, characterized in that: The flow channel unit (5) has a length ranging from 2 to 2.5 mm and a width ranging from 1.8 to 2 mm; the water inlet straight flow section (10) and the water outlet straight flow section (11) have a width ranging from 0.6 to 0.7 mm, a length ranging from 0.2 to 0.4 mm, and a depth ranging from 0.8 to 1 mm.

10. The anti-clogging sprinkler based on a crescent-shaped sand dune structure according to claim 2, characterized in that: The radius of the starting arc surface (12) of the heart-shaped side structure (8) is in the range of 2 to 3 mm, and the radius of the turning arc surface (13) is in the range of 0.4 to 0.5 mm.

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