A large-area uniform control and high anti-clogging water emitter for drip irrigation

Abstract

The present invention is applicable to the field of drip irrigation equipment, and provides a large-area uniform control and high anti-clogging water emitter for drip irrigation; the water emitter includes: a water emitter housing; a water inlet part, which is embedded in the central part of the water emitter housing; a flow channel part, and the flow channel part is a toothed reciprocating structure. The large-area uniform control and high anti-clogging water emitter for drip irrigation provided by the embodiment of the present invention first allows the overall water flow to enter the flow channel unit through the first straight section and impact on the vertical water-facing surface, and a part of the water flow that impacts on the topmost part of the water-facing surface will flow into the next flow channel unit through the first inclined section and the tooth fillet radius. At this time, the maximum energy dissipation of the water flow occurs at the tooth fillet radius, that is, the tooth tip, thereby effectively increasing the turbulent kinetic energy of the water flow inside the flow channel unit, so as to greatly extend the maximum laying distance of the drip irrigation tape and fill the domestic gap in the lack of water emitters and drip irrigation tapes for ultra-long distance laying.

Description

Technical Field

[0001] The present invention belongs to the field of drip irrigation equipment, and particularly relates to a large-area uniform control and high anti-clogging water emitter for drip irrigation. Background Art

[0002] The agricultural drip irrigation system is gradually developing towards large-scale and modernization. The single control area of the drip irrigation system has gradually become one of the evaluation criteria for the operation quality of the drip irrigation system. A larger single control area means that under the premise of the same energy consumption of the first device of the same set of drip irrigation systems, a larger area of farmland can be irrigated with high uniformity and high precision control. However, at present, the flow rates of domestic water emitter products mostly concentrate in the range of 1 - 3 L / h. Under the premise of ensuring high-uniform irrigation of the drip irrigation tape (the flow rate deviation between the first drip head and the last drip head of the drip irrigation tape is not greater than 10%), the longest laying distance of the drip irrigation tape mainly concentrates in the range of 60 - 80 m. While the flow rate of foreign water emitter products can be as low as 0.35 L / h, and the laying distance can reach 300 m. Therefore, there is an urgent need for a water emitter product with an extremely long laying distance and high uniformity. In addition, as the laying distance of the water emitter increases, it means that the drip head flow rate decreases, that is, the flow channel size of the water emitter decreases, which indicates that when there are more particulate impurities in the water source of the drip irrigation system, it is extremely easy to be blocked. Therefore, there is an urgent need for a large-area uniform control and high anti-clogging water emitter for drip irrigation.

[0003] In the prior art, Patent No. 201621445287.X proposed an arc-shaped turbulent flow tooth structure to improve the anti-clogging performance of the water emitter, but the flow rate and laying distance belong to the basic range of domestic existing products and cannot achieve extremely long-distance laying.

[0004] Again, in the prior art patents, Patent No. 201920246502.0 disclosed a drip irrigation water emitter and a drip irrigation tape, and proposed a high anti-clogging structure of the N-type flow channel. This invention proposed an anti-clogging structure superior to the N-type flow channel by deeply analyzing and comparing the hydraulic performance of the N-type flow channel. Moreover, the water emitter proposed by this invention has a smaller flow rate, a longer laying distance, and a larger single control area. In addition, other existing patent technologies such as CN118104551A, a small-flow anti-clogging drip irrigation drip head, and CN103651053A, a small-sized high anti-clogging drip irrigation water emitter, all adopt a symmetric oblique triangular tooth flow channel, which is provided with a plurality of triangular inner tooth units connected end to end. However, they are all traditional designed flow channel structures of drip irrigation devices, and their effects of improving the uniformity of drip irrigation are limited. CN109673482A relates to a drip irrigation water emitter. Although it can comprehensively analyze by adjusting parameters such as tooth height h, tooth bottom distance a, tooth bottom angle β, bottom angle radius r, bottom angle arc length b, and tooth spacing c and combining the definition of turbulent kinetic energy and vortex area, there is still a large room for improvement in its design structure.

[0005] Therefore, there is an urgent need to propose a large-area uniform control and high anti-clogging water emitter for drip irrigation, which can reduce the investment cost of the drip irrigation system significantly while ensuring the irrigation uniformity. This invention is of great significance to the green and sustainable development of agriculture. Summary of the Invention

[0006] The purpose of the embodiment of the present invention is to provide a large-area uniform control and high anti-clogging water emitter for drip irrigation, aiming to solve the problems of ultra-long distance laying and ensuring uniform irrigation and high anti-clogging performance.

[0007] The embodiment of the present invention is implemented as follows. A large-area uniform control and high anti-clogging water emitter for drip irrigation, the water emitter includes:

[0008] A water emitter housing;

[0009] An inlet part, the inlet part is embedded in the central part of the water emitter housing, and a sheet-type trash rack is arranged at the bottom of the inlet part;

[0010] Wherein, one side of the bottom of the inlet part is provided with an outlet part, and the outlet part is arranged inside the water emitter housing;

[0011] A flow channel part, both sides of the flow channel part are respectively communicated with the inlet part and the outlet part, the flow channel part is a toothed reciprocating structure, the flow channel part is fixedly connected by a plurality of flow channel units, and each flow channel unit is in a toothed shape. The flow channel unit is sequentially provided with a first straight segment, a first inclined segment, a second inclined segment, a third inclined segment and a second straight segment along the water flow direction.

[0012] The first straight segment and the first inclined segment form a water-facing surface to expand the distribution area of the high-value area of the turbulent kinetic energy, and the second inclined segment and the third inclined segment form a back water surface to reduce the distribution area of the low-value area of the turbulent kinetic energy in the back water area. There are multiple water-facing surfaces and back water surfaces, and the multiple water-facing surfaces and back water surfaces are distributed in a reverse symmetric cross-array, and the flow channel width is between the water-facing surfaces and back water surfaces distributed in the reverse symmetric cross-array.

[0013] As a further limitation of the technical solution of the embodiment of the present invention, the water flow passes through the inlet part and then enters the flow channel part and the outlet part in sequence. The flow channel part is arranged on the inner top side of the water emitter housing.

[0014] As a further limitation of the technical solution of the embodiment of the present invention, both the top and bottom of the cross-section of the outlet part and the flow channel part along the length direction perpendicular to the water emitter housing are arcs with equal radii.

[0015] The flow channel unit is located inside the water emitter housing, and the flow channel unit includes:

[0016] A first straight segment, the first straight segment is perpendicular to the overall water flow direction;

[0017] The first oblique line segment, which is connected to the first straight line segment at an obtuse angle;

[0018] The second oblique line segment, a tooth angle is formed between the second oblique line segment and the first oblique line segment, the fillet radius range of the tooth angle is 18° - 38°, the fillet radius range of the tooth angle is 0.03 - 0.1 mm, and the axis direction of the tooth angle is the same as the direction of the first straight line segment. Among them, the size range of the second oblique line is 0.2 - 0.7 mm;

[0019] The third oblique line segment, which is connected to the second oblique line segment at an obtuse angle;

[0020] The second straight line segment, which is connected to the third oblique line segment at an obtuse angle, and the obtuse angle formed by the second straight line segment and the third oblique line segment ranges from 105° to 165°, and the second straight line segment is perpendicular to the overall water flow direction.

[0021] As a further limitation of the technical solution of the embodiment of the present invention, the size range of the first straight line segment is 0.4 - 0.7 mm, and the obtuse angle range formed by the first straight line segment and the first oblique line segment is 120° - 165°.

[0022] As a further limitation of the technical solution of the embodiment of the present invention, the size range of the first oblique line segment is 0.15 - 0.4 mm, the obtuse angle range formed by the first oblique line segment and the second straight line segment is 105° - 165°, and the flow channel unit further includes:

[0023] The flow channel width, the range of the flow channel width is 0.35 - 0.6 mm;

[0024] The tooth fillet radius, both sides of the tooth fillet radius are respectively connected to the first oblique line segment and the second oblique line segment;

[0025] The tooth height, the range of the tooth height is 0.6 - 0.9 mm;

[0026] The tooth pitch, the range of the tooth pitch is 0.9 - 1.5 mm;

[0027] The flow channel depth, the size range of the flow channel depth is 0.35 - 0.8 mm.

[0028] The first surface of the flow channel unit in contact with the water flow is the water-facing surface. The water-facing surface is a surface formed by a first straight line segment and a first oblique line segment perpendicular to the overall direction of the water flow. The perpendicular water-facing surface wall can expand the distribution area of the high-value region of the turbulent kinetic energy between the tooth tip and the wall. Opposite to the water-facing surface is the back water surface. The back water surface is a surface formed by a second oblique line segment and a third oblique line segment. The multi-segment back water surface can reduce the distribution area of the low-value region of the turbulent kinetic energy in the back water area. There are multiple water-facing surfaces and back water surfaces, and the multiple water-facing surfaces and back water surfaces are distributed in a reverse symmetric cross array, and the flow channel width is between the water-facing surfaces and back water surfaces distributed in the reverse symmetric cross array.

[0029] Beneficial effects:

[0030] 1. Compared with the prior art, the large-area uniform control irrigation emitter proposed by the present invention has a flow rate of 0.4 L / h under the rated pressure (0.1 MPa) (with the difference in the outflow rates of the first irrigation emitter and the last irrigation emitter not exceeding 10% as the reference standard). First, the overall water flow enters the flow channel unit through the first straight line segment and impacts on the perpendicular water-facing surface. A part of the water flow impacting on the top of the water-facing surface will flow into the next flow channel unit through the first oblique line segment and the tooth fillet radius. At this time, the maximum energy dissipation occurs at the tooth fillet radius, that is, the tooth tip, effectively increasing the turbulent kinetic energy of the water flow inside the flow channel unit, thus greatly extending the maximum laying distance of the drip irrigation tape and filling the domestic gap in the lack of irrigation emitters and drip irrigation tapes for ultra-long distance laying.

[0031] 2. Compared with the prior art, the present invention optimizes the flow channel structure. Compared with the current mainstream symmetric tooth-shaped flow channels, through vertical energy dissipation in the water-facing area, the turbulent kinetic energy of the water flow inside the flow channel unit is effectively increased. The reaction force of the water-facing surface will cause the water flow to move towards the back water surface direction, and under the reaction of the back water surface wall, it collides with the water flow gradually entering the flow channel width, forming a vortex area, reducing the deposition of particles and impurities in the flow channel unit, and thus effectively improving the anti-clogging performance of the product during use. The water flow passing through the tooth tip will be mixed with the water flow of the reverse water-facing surface and enter the multi-segment back water surface opposite to the reverse water-facing surface, greatly increasing the proportion of the low-value area in this back water area and further ensuring the anti-clogging performance of the product.

[0032] 3. Compared with the prior art, in the present application, the distribution areas of the low-turbulent kinetic energy region and the high-turbulent kinetic energy region are adjusted through the water-facing surface and the water-back surface with multiple differential functions. The water-facing surface and the water-back surface are distributed in a reverse symmetric cross-array, and the flow channel width is between the water-facing surface and the water-back surface of the reverse symmetric cross-array. The large-area uniform control applicable and high anti-clogging water emitter proposed by the present invention can achieve strong anti-clogging performance under the condition of ultra-long-distance laying, improve the service life of the product, reduce the maintenance cost during the use of the product, and further reduce the overall maintenance cost and service life of the irrigation system, so that the product meets the usage requirements of different water qualities, thereby effectively improving the applicability of the product.

[0033] In summary, by setting the water-facing surface, the water-back surface and the tooth fillet radius distributed in a reverse symmetric cross-array, the present product gradually increases the energy dissipation of the water flow inside the flow channel unit at the vertical part of the water-facing surface, which helps to improve the turbulent kinetic energy of the water flow in the flow channel unit, and forms a vortex area at the water-back surface, greatly improving the anti-clogging performance of the product. As the water flow continues to flow, the water flow passing through the tooth fillet radius will be mixed with the water flow of the reverse water-facing surface. At this time, the water flow generates the maximum energy dissipation at the tooth fillet radius, that is, the tooth tip, effectively ensuring the turbulent kinetic energy of the water flow inside the flow channel unit. And the water flow passing through the tooth fillet radius will enter the water-back surface opposite to the reverse water-facing surface, so as to greatly increase the proportion of the low-value area in this water-back area, reduce the coupling and cooperation of the low values in the water-back area, and further ensure the anti-clogging performance of the product, so as to ensure the ultra-long-distance laying and irrigation uniformity of the product, thereby improving the comprehensive performance and practicability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0035] Figure 1 It is a three-dimensional structure schematic diagram of the drip irrigation emitter provided by the embodiment of the present application;

[0036] Figure 2 is Figure 1 the top view structure schematic diagram of the drip irrigation emitter in

[0037] Figure 3 is Figure 1 the bottom view structure schematic diagram of the drip irrigation emitter in

[0038] Figure 4 It is a schematic diagram of the tooth profile structure parameters provided by the embodiment of the present application;

[0039] Figure 5 It is a schematic diagram of the flow channel structure parameters provided by the embodiment of the present application;

[0040] Figure 6 Schematic diagram of the flow channel depth parameter structure provided by the embodiment of the present application;

[0041] Figure 7 Geometric comparison diagram of the optimized structure and the N-type structure of the present application;

[0042] Figure 8 is Figure 7 Contour map of the turbulent kinetic energy comparison of two flow channels in

[0043] Figure 9 is Figure 7 Contour map of the particle trajectory comparison of two flow channels in

[0044] Figure 10 Geometric comparison diagram of the embodiment of the present application and the traditional flow channel;

[0045] Figure 11 is Figure 10 Contour map of the turbulent kinetic energy comparison of two flow channels in

[0046] Figure 12 is Figure 10 Contour map of the particle trajectory comparison of two flow channels in

[0047] Figure 13 is Figure 10 Comparison diagram of the escape rates of particles with different particle sizes in two flow channels in

[0048] In the accompanying drawings: 1. Water inlet part; 2. Flow channel; 201. First straight section; 202. First inclined section; 203. Second inclined section; 204. Third inclined section; 205. Second straight section; 206. Tooth angle; 207. Tooth fillet radius, 208. Flow channel width; 209. Tooth height; 210. Tooth pitch; 211. Flow channel depth; 3. Water outlet part. Detailed implementation manners

[0049] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] The objective of the embodiment of the present invention is to provide a large-area uniform control and high anti-clogging irrigation device for drip irrigation, aiming to solve the problems of ultra-long distance laying and ensuring high-uniform irrigation and high anti-clogging performance.

[0051] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0052] Embodiment 1

[0053] Figure 1This is a three-dimensional structure schematic diagram of the drip irrigation emitter provided by the embodiment of the present application.

[0054] Figure 4 This is a schematic diagram of the tooth-shaped structure parameters provided by the embodiment of the present application.

[0055] Specifically, as Figure 1 and Figure 4 shown, in the embodiment of the present invention, a large-area uniform control and high anti-clogging emitter for drip irrigation, the emitter includes:

[0056] Emitter housing;

[0057] Water inlet part 1, the water inlet part 1 is embedded in the central part of the emitter housing, and a plate-type trash rack is arranged at the bottom of the water inlet part 1;

[0058] Among them, a water outlet part 3 is arranged on one side of the bottom of the water inlet part 1, and the water outlet part 3 is arranged inside the emitter housing;

[0059] Flow channel part 2, both sides of the flow channel part 2 are respectively communicated with the water inlet part 1 and the water outlet part 3, the flow channel part 2 is a toothed reciprocating structure, the flow channel part 2 is composed of a plurality of flow channel units fixedly connected, and each flow channel unit is in a toothed shape, and the flow channel unit is sequentially provided with a first straight section 201, a first inclined section 202, a second inclined section 203, a third inclined section 204 and a second straight section 205 along the water flow direction.

[0060] The first straight section and the first inclined section form a water-facing surface to expand the distribution area of the high-value area of the turbulent kinetic energy, and the second inclined section and the third inclined section form a back water surface to reduce the distribution area of the low-value area of the turbulent kinetic energy in the back water area. There are a plurality of the water-facing surfaces and the back water surfaces, and the plurality of water-facing surfaces and the back water surfaces are distributed in a reverse symmetric cross array, and the flow channel width is between the water-facing surfaces and the back water surfaces distributed in the reverse symmetric cross array.

[0061] Figure 2 For Figure 1 the top view structure schematic diagram of the drip irrigation emitter in

[0062] Figure 3 For Figure 1 the bottom view structure schematic diagram of the drip irrigation emitter in

[0063] Please refer to Figures 1 - 4 , in the embodiment of the present invention, the water flow passes through the water inlet part 1 and sequentially enters the inside of the flow channel part 2 and the water outlet part 3. The flow channel part 2 is arranged on the inner top side of the emitter housing, and the water outlet part 3 and the flow channel part 2 are both arcs with equal radii at the top and bottom of the cross section perpendicular to the length direction of the emitter housing.

[0064] Embodiment 2

[0065] Figure 1 3D structural schematic diagram of the drip irrigation emitter provided by the embodiment of the present application.

[0066] Figure 4 Schematic diagram of the tooth-shaped structure parameters provided by the embodiment of the present application.

[0067] Specifically, as Figure 1 and Figure 4 shown, in the embodiment of the present invention, a large-area uniform control and high anti-clogging emitter for drip irrigation, the emitter includes:

[0068] Emitter housing;

[0069] Water inlet part 1, the water inlet part 1 is embedded in the central part of the emitter housing, and a plate-type trash rack is arranged at the bottom of the water inlet part 1;

[0070] Among them, one side of the bottom of the water inlet part 1 is provided with a water outlet part 3, and the water outlet part 3 is arranged inside the emitter housing;

[0071] Flow channel part 2, both sides of the flow channel part 2 are respectively communicated with the water inlet part 1 and the water outlet part 3, the flow channel part 2 is a toothed reciprocating structure, the flow channel part 2 is composed of a plurality of flow channel units fixedly connected, and each flow channel unit is in a toothed shape, and the flow channel unit is sequentially provided with a first straight section 201, a first inclined section 202, a second inclined section 203, a third inclined section 204 and a second straight section 205 along the water flow direction.

[0072] Figure 5 Schematic diagram of the flow channel structure parameters provided by the embodiment of the present application.

[0073] Figure 6 Schematic diagram of the flow channel depth parameter structure provided by the embodiment of the present application.

[0074] Please refer to Figure 1 、 Figure 4 and Figures 5 - 6 , in the embodiment of the present invention, the flow channel unit is located inside the emitter housing, and the flow channel unit includes:

[0075] First straight section 201, the first straight section 201 is perpendicular to the overall water flow direction;

[0076] First inclined section 202, the first inclined section 202 is connected to the first straight section 201 at an obtuse angle;

[0077] The second inclined line segment 203, a tooth angle 206 is formed between the second inclined line segment 203 and the first inclined line segment 202, the fillet radius range of the tooth angle 206 is 18° - 38°, the fillet radius range of the tooth angle 206 is 0.03 - 0.1 mm, and the axial direction of the tooth angle 206 is the same as the direction of the first straight line segment 201. Among them, the size range of the second inclined line 203 is 0.2 - 0.7 mm;

[0078] The third inclined line segment 204, the third inclined line segment 204 is connected to the second inclined line segment 203 at an obtuse angle;

[0079] The second straight line segment 205, the second straight line segment 205 is connected to the third inclined line segment 204 at an obtuse angle, and the obtuse angle formed by the second straight line segment 205 and the third inclined line segment 204 ranges from 105° to 165°, and the second straight line segment 205 is perpendicular to the overall water flow direction;

[0080] The size range of the first straight line segment 201 is 0.4 - 0.7 mm, and the obtuse angle formed by the first straight line segment 201 and the first inclined line segment 202 ranges from 120° to 165°.

[0081] Embodiment 3

[0082] Figure 1 It is a three-dimensional structure schematic diagram of the drip irrigation emitter provided by the embodiment of the present application.

[0083] Figure 4 It is a schematic diagram of the tooth-shaped structure parameters provided by the embodiment of the present application.

[0084] Specifically, as Figure 1 and Figure 4 shown, in the embodiment of the present invention, a large-area uniform control and high anti-clogging emitter for drip irrigation, the emitter includes:

[0085] Emitter housing;

[0086] The water inlet part 1, the water inlet part 1 is embedded in the central part of the emitter housing, and a sheet type trash rack is arranged at the bottom of the water inlet part 1;

[0087] Among them, a water outlet part 3 is arranged on one side of the bottom of the water inlet part 1, and the water outlet part 3 is arranged inside the emitter housing;

[0088] The flow channel part 2, both sides of the flow channel part 2 are respectively communicated with the water inlet part 1 and the water outlet part 3, the flow channel part 2 is a toothed reciprocating structure, the flow channel part 2 is composed of a plurality of flow channel units fixedly connected, and each flow channel unit is in a toothed shape. The flow channel units are sequentially provided with a first straight line segment 201, a first inclined line segment 202, a second inclined line segment 203, a third inclined line segment 204 and a second straight line segment 205 along the water flow direction.

[0089] Figure 7 This is a geometric comparison diagram of the optimized structure of this application and the N-type structure.

[0090] Figure 8 For Figure 7 the cloud diagram of the turbulent kinetic energy comparison of two flow channels in

[0091] Figure 9 For Figure 7 the cloud diagram of the particle trajectory comparison of two flow channels in

[0092] Figure 10 This is a geometric comparison diagram of the embodiment of this application and the traditional flow channel.

[0093] Figure 11 For Figure 10 the cloud diagram of the turbulent kinetic energy comparison of two flow channels in

[0094] Figure 12 For Figure 10 the cloud diagram of the particle trajectory comparison of two flow channels in

[0095] Figure 13 For Figure 10 the comparison diagram of the escape rates of particles with different particle sizes in two flow channels in

[0096] Please refer to Figure 1 , Figure 4 and Figures 7 - 8 , in the embodiment of the present invention, the size range of the first oblique line segment 202 is 0.15 - 0.4 mm, the obtuse angle range formed by the first oblique line segment 202 and the second straight line segment 205 is 105° - 165°, and the flow channel unit further includes:

[0097] flow channel width 208, and the range of the flow channel width 208 is 0.35 - 0.6 mm;

[0098] tooth fillet radius 207, and both sides of the tooth fillet radius are respectively connected to the first oblique line segment 202 and the second oblique line segment 203;

[0099] tooth height 209, and the range of the tooth height 209 is 0.6 - 0.9 mm;

[0100] tooth pitch 210, and the range of the tooth pitch 210 is 0.9 - 1.5 mm;

[0101] flow channel depth 211, and the size range of the flow channel depth 211 is 0.35 - 0.8 mm.

[0102] The first surface of the flow channel unit in contact with the water flow is the water-facing surface, which is a surface formed by a first straight line segment 201 and a first inclined line segment 202 perpendicular to the overall direction of the water flow. The perpendicular water-facing surface wall can expand the distribution area of the high-value region of the turbulent kinetic energy between the tooth tip and the wall. Opposite to the water-facing surface is the back surface, which is a surface formed by a second inclined line segment 203 and a third inclined line segment 204. The multi-segment back surface can reduce the distribution area of the low-value region of the turbulent kinetic energy in the backwater area. There are multiple water-facing surfaces and back surfaces, and the multiple water-facing surfaces and back surfaces are distributed in a reverse symmetric cross array, and the flow channel width is between the water-facing surfaces and back surfaces distributed in the reverse symmetric cross array.

[0103] As a further limitation of the technical solution of the embodiment of the present invention, in order to prove that the tooth shape proposed by the present invention has good anti-clogging performance, through comparative analysis with the anti-clogging performance of the existing mainstream symmetric tooth shape, the optimized design of the water-facing surface and the back surface is the preferred part of the technical solution adopted by the present invention. The present invention conducts an in-depth comparison with the N-type flow channel. The comparative analysis uses the same flow channel parameters, including flow channel length, tooth angle, tooth pitch, tooth height, flow channel depth, and tooth angle fillet, etc. Under the condition that the boundary conditions remain unchanged (the inlet pressure is 0.1 MPa and the outlet is free out-flow), numerical simulations are carried out on both of them, and the kinetic energy comparison cloud diagram is as Figure 8 shown. It can be found that the optimized structure proposed by the present invention enhances the proportion of the high-value region of the kinetic energy in the flow channel, which will enhance the collision effect of the water flow in the flow channel, thereby avoiding the deposition of small particle impurities in the flow channel. The particle migration trajectory comparison cloud diagram is as Figure 9 shown. It can be found that the time for the particles to pass through the flow channel optimized structure of the present invention is only 0.22 s, while the particles of the same size still do not escape after migrating in the N-type flow channel for 0.55 s. The above demonstration can fully prove that the present invention proposes a structure superior to other types;

[0104] The present invention adopts an optimized structure and designs a large-area controlled and highly anti-clogging water emitter for the current demand of the drip irrigation industry. In order to achieve the large-area control effect, a highly anti-clogging structure is also adopted. The shaped product proposed by the present invention is also compared in depth with the traditional tooth-shaped products on the market. The flow channel structure parameters used in the comparative analysis, including flow channel length, tooth angle, tooth pitch, tooth height, flow channel depth, and tooth angle fillet, etc., are all the same. The structures of the two flow channels are as Figure 10 shown. Under the condition that the boundary conditions remain unchanged (the inlet pressure is 0.1 MPa and the outlet is free out-flow), numerical simulations are carried out on both of them, and the turbulent kinetic energy comparison cloud diagram is as Figure 11As shown, it can be seen from the enlarged view of the flow channel unit that the proportion of the high-value area of the turbulent kinetic energy in the optimized structure proposed by the present invention is larger (the less white area in the figure). This will enable a larger anti-blocking performance even when the cross-sectional area of the flow channel is small. Particles are less likely to enter the low-speed area and deposit. The migration trajectories of particles with the same particle size in the two flow channels are as follows Figure 12 As shown, it can be found that the escape time of particles in the structure proposed by the present invention is only 0.32 s, while although the traditional structure can also achieve small-flow irrigation, the particle escape time is 3.84 times that of the present invention. In addition, the present invention has carried out simulation comparison tests with particles of different particle sizes in the two flow channels, and the comparison results are as follows Figure 13 As shown.

[0105] In summary:

[0106] The large-area uniform control and high anti-blocking water emitter for drip irrigation provided by the embodiment of the present invention. Water flows into the flow channel unit through the first straight section 201. At this time, the overall water flow will directly hit the vertical water-facing surface, thereby increasing the energy dissipation of the water flow inside the flow channel unit. Another part of the water flow that has undergone vertical energy dissipation through the water-facing surface flows through the tooth tip to the next flow channel unit, generating the maximum energy dissipation at the tooth tip. The present invention adopts a fillet tooth tip with R0.04, and the energy dissipation effect is obvious, which will greatly extend the maximum laying distance of the drip irrigation tape and make up for the domestic blank of lacking water emitters and drip irrigation tapes for ultra-long-distance laying.

[0107] For the large-area uniform control and high anti-blocking water emitter for drip irrigation provided by the embodiment of the present invention, a part of the water flow that has undergone vertical energy dissipation through the water-facing surface flows towards the wall surface side, forming a vortex area. The better the turbulent effect in the vortex area, the less likely the particles are to deposit in the vortex area, so as to effectively improve the anti-blocking effect of the product. And the water flow enters the multi-segment backwater area between the teeth through the tooth tip efficiency, so as to greatly increase the proportion of the low-value area in the backwater area, increasing the escape rate of impurity particles in the flow channel and reducing the escape time, further improving the anti-blocking performance of the product.

[0108] For the large-area uniform control and high anti-blocking water emitter for drip irrigation provided by the embodiment of the present invention, each flow channel unit adopts the same structural form, and the energy dissipation will be gradually accumulated, thereby improving the irrigation uniformity. The product can achieve strong anti-blocking performance while realizing ultra-long-distance laying, which will be of great significance for improving the service life of the drip irrigation system, reducing the maintenance cost of the drip irrigation system, improving the utilization rate of water resources with different water qualities, and promoting the sustainable development of agricultural resources.

[0109] Working principle:

[0110] S1. Overall, the water flow enters the flow channel unit through the first straight segment 201, that is, the overall water flow moves inside the flow channel width 208. As the overall water flow continuously moves, a part of the water flow will directly hit the vertical water-facing surface first. The reaction force of the water-facing surface will cause the water flow hitting the bottom side of its surface to collide with the water flow continuously entering the flow channel unit, effectively enhancing the turbulent kinetic energy of the water flow inside the flow channel unit;

[0111] S2. And a part of the water flow hitting the top of the vertical water-facing surface will move in the direction of the water-receiving surface composed of the second inclined segment 203 and the third inclined segment 204 under its reaction force, and collide with the water flow gradually entering the flow channel width 208 under the reaction of the water-receiving surface wall to form a vortex area, thereby improving the anti-clogging performance of the product during use;

[0112] S3. As the water flow continues to flow, the water flow will hit the surface of the first straight segment 201, that is, regard the first straight segment 201 as the next water-facing surface arranged in the reverse direction, and the opposite of the water-facing surface is the water-receiving surface. As known above, the turbulent kinetic energy and anti-clogging performance at the first straight segment 201 and the multi-segment water-receiving surface are further improved;

[0113] S4. At the same time, a part of the water flow hitting the top of the vertical water-facing surface will flow into the next flow channel unit through the first inclined segment 202 and the tooth fillet radius 207, and the maximum energy dissipation will occur at the tooth fillet radius 207, that is, the tooth tip, effectively enhancing the turbulent kinetic energy of the water flow inside the flow channel unit;

[0114] S5. The water flow passing through the tooth fillet radius 207 will be mixed with the water flow of the reverse water-facing surface and enter the multi-segment water-receiving surface opposite to the reverse water-facing surface, so as to greatly increase the proportion of the low-value area in this water-receiving area, and further ensure the anti-clogging performance of the product.

[0115] By setting the water-facing surface, water-receiving surface and tooth fillet radius distributed in a reverse symmetric cross-array, the product gradually increases the energy dissipation of the water flow inside the flow channel unit at the vertical part of the water-facing surface, assisting in enhancing the turbulent kinetic energy of the water flow inside the flow channel unit, and forming a vortex area at the water-receiving surface, greatly improving the anti-clogging performance of the product. As the water flow continues to flow, the water flow passing through the tooth fillet radius will be mixed with the water flow of the reverse water-facing surface. At this time, the maximum energy dissipation occurs at the tooth fillet radius, that is, the tooth tip, effectively ensuring the turbulent kinetic energy of the water flow inside the flow channel unit. The water flow passing through the tooth fillet radius will enter the water-receiving surface opposite to the reverse water-facing surface, so as to greatly increase the proportion of the low-value area in this water-receiving area, reduce the mutual coupling of the low values in the water-receiving area, and further ensure the anti-clogging performance of the product, so as to ensure the ultra-long distance laying and irrigation uniformity of the product, thereby improving the comprehensive performance and practicability of the product.

[0116] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A large - area uniform control and highly anti - clogging water emitter for drip irrigation, characterized in that: The water emitter includes: A water emitter housing; An inlet part, which is embedded in the central part of the water emitter housing, and a plate - type trash rack is arranged at the bottom of the inlet part; Among them, on one side of the bottom of the inlet part, there is an outlet part, and the outlet part is arranged inside the water emitter housing; A flow channel part, both sides of the flow channel part are respectively communicated with the inlet part and the outlet part. The flow channel part is a toothed reciprocating structure. The flow channel part is composed of a plurality of flow channel units fixedly connected, and each flow channel unit is in a toothed shape. The flow channel unit is sequentially provided with a first straight section, a first inclined section, a second inclined section, a third inclined section, and a second straight section along the water flow direction; The first straight section and the first inclined section form a water - facing surface to expand the distribution area of the high - value area of turbulent kinetic energy. The second inclined section and the third inclined section form a back - water surface to reduce the distribution area of the low - value area of turbulent kinetic energy in the back - water area. There are multiple water - facing surfaces and back - water surfaces, and multiple water - facing surfaces and back - water surfaces are distributed in a reverse - symmetric cross - array, and the flow channel width is between the water - facing surfaces and back - water surfaces in the reverse - symmetric cross - array distribution; The flow channel unit is located inside the water emitter housing; Among them, the flow channel unit includes: a first straight section, the first straight section is perpendicular to the overall water flow direction, a first inclined section, the first inclined section is connected to the first straight section at an obtuse angle, a second inclined section, a tooth angle is formed between the second inclined section and the first inclined section, and the axis direction of the tooth angle is the same as the direction of the first straight section, a third inclined section, the third inclined section is connected to the second inclined section at an obtuse angle, a second straight section, the second straight section is connected to the third inclined section at an obtuse angle, and the second straight section is perpendicular to the overall water flow direction; The fillet radius range of the tooth angle is 18° - 38°, and the fillet radius range of the tooth angle is 0.03 - 0.1 mm. Among them, the size range of the second inclined section is 0.2 - 0.7 mm; The obtuse angle formed by the second straight section and the third inclined section ranges from 105° - 165°; The first surface of the flow channel unit in contact with the water flow is the water - facing surface. The water - facing surface is the surface formed by the first straight section and the first inclined section perpendicular to the overall water flow direction. The perpendicular water - facing surface wall can expand the distribution area of the high - value area of turbulent kinetic energy at the tooth tip and the wall surface. Opposite to the water - facing surface is the back - water surface. The multi - segment back - water surface reduces the distribution area of the low - value area of turbulent kinetic energy in the back - water area.

2. The large-area uniform control and high anti-clogging water emitter for drip irrigation according to claim 1, characterized in that, The water flow passes through the inlet part and then enters the flow channel part and the outlet part in sequence. The flow channel part is arranged on the inner top side of the water emitter housing.

3. The large-area uniform control and high anti-clogging water emitter for drip irrigation according to claim 2, characterized in that, Both the top and bottom of the cross - section of the outlet part and the flow channel part along the length direction perpendicular to the water emitter housing are arcs with equal radii.

4. The large-area uniform control and high anti-clogging water emitter for drip irrigation according to claim 3, characterized in that, The size range of the first straight section is 0.4 - 0.7 mm, and the obtuse angle formed by the first straight section and the first inclined section ranges from 120° - 165°.

5. The large-area uniform control and high anti-clogging water emitter for drip irrigation according to claim 4, wherein The size range of the first inclined section is 0.15 - 0.4 mm, the obtuse angle formed by the first inclined section and the second straight section ranges from 105° - 165°, and the flow channel unit further includes: A flow channel width, and the range of the flow channel width is 0.35 - 0.6 mm; Tooth fillet radius, with both sides of the tooth fillet radius being connected to the first oblique line segment and the second oblique line segment respectively; Tooth height, and the range of the tooth height is 0.6 - 0.9 mm; Tooth pitch, and the range of the tooth pitch is 0.9 - 1.5 mm; Runner depth, and the dimension range of the runner depth is 0.35 - 0.8 mm.

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