Large-area uniform-control high-blocking-resistance irrigation emitter for drip irrigation

Abstract

The invention is suitable for the field of drip irrigation equipment, and provides a large-area uniform-control and high-blocking-resistance irrigation emitter for drip irrigation. The irrigation emitter comprises an irrigation emitter shell; the water inlet part is embedded in the central part of the irrigation emitter shell; and the runner part is of a tooth-shaped reciprocating structure. According to the large-area uniform-control and high-blocking-resistance irrigation emitter for drip irrigation, firstly, the whole water flow enters the flow channel units through the first straight line sections and impacts on the vertical upstream face, and part of the water flow impacting the topmost part of the upstream face flows into the next flow channel unit through the first oblique line sections and the tooth fillet radiuses; at the moment, the water flow generates maximum energy dissipation at the tooth fillet radius, namely the tooth tip, so that the turbulent kinetic energy of the water flow in the flow channel unit is effectively improved, the maximum laying distance of the drip irrigation tape is greatly prolonged, and the blank of lack of ultra-long-distance laying of the irrigation emitter and the drip irrigation tape in China is filled.

Description

Technical Field

[0001] The invention belongs to the field of drip irrigation equipment, and in particular relates to a large-area uniformly controlled and highly resistant to blockage emitter for drip irrigation. Background Art

[0002] The agricultural drip irrigation system is gradually developing towards 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 the same set of drip irrigation system head device can irrigate a larger area of ​​farmland with high uniformity and high precision under the premise of the same energy consumption. However, the flow rate of domestic sprinkler products is mostly concentrated in the range of 1-3L / h. Under the premise of ensuring high uniform irrigation of the drip irrigation belt (the flow deviation between the first dripper and the last dripper of the drip irrigation belt is not more than 10%) Under the current situation, the longest laying distance of drip tape is mainly concentrated in 60-80m, while the flow rate of foreign sprinkler products can be as low as 0.35L / h, and the laying distance can reach 300m. Therefore, there is an urgent need for a sprinkler product with ultra-long laying distance and high uniformity. In addition, the increase in the laying distance of the sprinkler means a decrease in the flow rate of the dripper, that is, the size of the sprinkler flow channel is reduced, which means that when there are more particulate impurities in the water source of the drip irrigation system, it will be very easy to get clogged. Therefore, there is an urgent need for a large-area uniform control and high anti-clogging sprinkler for drip irrigation.

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

[0004] Another example is the prior art patent, patent No. 201920246502.0 discloses a drip irrigation emitter and a drip irrigation belt, and proposes a high anti-clogging structure of the N-type flow channel. The invention proposes an anti-clogging structure that is superior to the N-type flow channel through in-depth analysis and comparison of the hydraulic performance of the N-type flow channel. The emitter proposed in the 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 dripper, and CN103651053A involving a small Highly clogging-resistant drip irrigation devices all adopt a flow channel with symmetrical oblique triangular teeth, and are provided with a plurality of triangular inner tooth units connected end to end. However, they are all designed flow channel structures of traditional drip irrigation devices, and the effect of improving the uniformity of drip irrigation is limited. CN109673482A relates to a drip irrigation device. Although it can be comprehensively analyzed 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 zone, its design structure still has a large room for improvement.

[0005] Therefore, there is an urgent need to propose a large-area uniform control and highly resistant to clogging sprinkler for drip irrigation, which can significantly reduce the investment cost of the drip irrigation system while ensuring 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 uniformly controlled and highly resistant to clogging emitter for drip irrigation, aiming to solve the problem of ultra-long-distance laying and ensuring uniform irrigation and high clogging resistance.

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

[0008] Irrigator housing;

[0009] A water inlet, which is embedded in the center of the sprinkler housing and has a sheet-type trash rack at the bottom;

[0010] Wherein, a water outlet is arranged at one side of the bottom of the water inlet, and the water outlet is arranged inside the housing of the sprinkler;

[0011] A flow channel portion, wherein both sides of the flow channel portion are respectively connected with the water inlet portion and the water outlet portion, the flow channel portion is a toothed reciprocating structure, the flow channel portion is composed of a plurality of flow channel units fixedly connected, and each of the flow channel units is toothed, and the flow channel units are sequentially provided with a first straight line segment, a first oblique line segment, a second oblique line segment, a third oblique line segment and a second straight line segment along the water flow direction.

[0012] The first straight line segment and the first oblique line segment form a water-facing surface to expand the distribution area of ​​the high-value area of ​​turbulent kinetic energy, and the second oblique line segment and the third oblique line segment form a water-retaining surface to reduce the distribution area of ​​the low-value area of ​​turbulent kinetic energy in the water-retaining area. The water-facing surface and the water-retaining surface are provided in multiple forms, and the multiple water-facing surfaces and the water-retaining surfaces are distributed in an inversely symmetrical cross array, and the flow channel width is between the water-facing surface and the water-retaining surface distributed in the inversely symmetrical cross array.

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

[0014] As a further limitation of the technical solution of the embodiment of the present invention, the water outlet portion and the flow channel portion both have arcs of equal radius at the top and bottom of the cross section perpendicular to the length direction of the emitter housing.

[0015] The flow channel unit is located inside the emitter housing, wherein the flow channel unit comprises:

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

[0017] a first oblique line segment, the first oblique line segment being connected to the first straight line segment at an obtuse angle;

[0018] A second oblique line segment, wherein a tooth angle is formed between the second oblique line segment and the first oblique line segment, the fillet radius of the tooth angle is in the range of 18°-38°, the fillet radius of the tooth angle is in the range of 0.03-0.1 mm, and the axial direction of the tooth angle is consistent with the direction of the first straight line segment, wherein the size range of the second oblique line is 0.2-0.7 mm;

[0019] a third oblique line segment, the third oblique line segment being connected to the second oblique line segment at an obtuse angle;

[0020] The second straight line segment 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 is in the range of 105°-165°, and the second straight line segment is perpendicular to the overall direction of the water flow.

[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 formed by the first straight line segment and the first oblique line segment is in the range of 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 between the first oblique line segment and the second straight line segment is in the range of 105°-165°, and the flow channel unit further includes:

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

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

[0025] Tooth height, the tooth height ranges from 0.6 to 0.9 mm;

[0026] Tooth spacing, the tooth spacing range is 0.9-1.5mm;

[0027] The flow channel depth has a size range of 0.35-0.8 mm.

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

[0029] Beneficial effects:

[0030] 1. Compared with the prior art, the present invention is suitable for large-area uniformly controlled irrigation device under rated pressure (0.1MPa) with a flow rate of 0.4L / h (with the difference in the outflow rate between the first irrigation device and the last irrigation device not exceeding 10% as a reference standard). The water flow first passes through the first straight line segment into the flow channel unit and hits the vertical water-facing surface. A part of the water flow hitting the top of the water-facing surface flows through the first oblique line segment and the tooth fillet radius to the next flow channel unit. At this time, the water flow produces the maximum energy dissipation at the tooth fillet radius, i.e., the tooth tip, thereby effectively improving the turbulent kinetic energy of the water flow inside the flow channel unit, thereby greatly extending the maximum laying distance of the drip irrigation belt, and filling the gap in the lack of irrigation devices and drip irrigation belts for ultra-long distance laying in China.

[0031] 2. Compared with the prior art, the present invention optimizes the flow channel structure. Compared with the current mainstream symmetrical tooth-shaped flow channel, the present invention effectively improves the turbulent kinetic energy of the water flow inside the flow channel unit through vertical energy dissipation in the water front area, and the reaction force of the water front surface will cause the water flow to move toward the back water surface, and under the reaction of the back water surface wall, it will collide with the water flow gradually entering the flow channel width to form a vortex area, reducing the deposition of particles and impurities in the flow channel unit, thereby effectively improving the anti-clogging performance of the product during use, and the water flow passing through the tooth tip will mix with the water flow on the reverse water front surface, and enter the multi-segment back water surface opposite to the reverse water front surface, so as to greatly increase the proportion of the low-value area in this back water area, further ensuring the anti-clogging performance of the product.

[0032] 3. Compared with the prior art, in the present application, the distribution area of ​​the low-value area and the high-value area of ​​turbulent kinetic energy is adjusted through the water-facing surface and the water-retaining surface with multiple differentiated functions. The water-facing surface and the water-retaining surface are distributed in an inversely symmetrical cross array, and the flow channel width is between the water-facing surface and the water-retaining surface of the inversely symmetrical cross array. The high-resistance to clogging sprinkler proposed in the present invention, which is suitable for large-area uniform control and management, can achieve strong anti-clogging performance when laid over an ultra-long distance, thereby improving the service life of the product and reducing the maintenance cost of the product during use, thereby reducing the overall maintenance cost and service life of the irrigation system, so that the product meets the use requirements of different water qualities, thereby effectively improving the applicability of the product.

[0033] To summarize, this product sets the water-facing surface, back-to-water surface and tooth fillet radius distributed in an inversely symmetrical cross array, so that the vertical part of the water-facing surface gradually increases the energy dissipation of the water flow inside the flow channel unit, which helps to increase the turbulent kinetic energy of the water flow in the flow channel unit and forms a vortex area at the back-to-water 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 mix with the water flow on the reverse water-facing surface. At this time, the water flow produces the maximum energy dissipation at the tooth fillet radius, i.e., 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 back-to-water surface opposite to the reverse water-facing surface, so as to greatly increase the proportion of the low-value area in this back-to-water area, reduce the mutual coupling and coordination of the low values ​​in the back-to-water area, further ensure the anti-clogging performance of the product, and ensure the ultra-long distance laying and irrigation uniformity of the product, thereby improving the comprehensive performance and practicality 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0035] Figure 1 A schematic diagram of the three-dimensional structure of a drip irrigation emitter provided in an embodiment of the present application;

[0036] Figure 2 for Figure 1 A schematic diagram of the top view of the drip irrigation emitter;

[0037] Figure 3 for Figure 1 A schematic diagram of the structure of a drip irrigation emitter viewed from above;

[0038] Figure 4 A schematic diagram of tooth structure parameters provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of flow channel structure parameters provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of the flow channel depth parameter structure provided in an embodiment of the present application;

[0041] Figure 7 This is a geometric comparison diagram of the optimized structure for this application and the N-type structure;

[0042] Figure 8 for Figure 7 Comparison cloud diagram of turbulent kinetic energy of two flow channels;

[0043] Fig. 9 for Figure 7 Comparison cloud diagram of particle trajectories in the two flow channels;

[0044] Fig.10 A geometric comparison diagram of the embodiment of the present application and the traditional flow channel;

[0045] Fig.11 for Fig.10 Comparison cloud diagram of turbulent kinetic energy of two flow channels;

[0046] Fig.12 for Fig.10 Comparison cloud diagram of particle trajectories in the two flow channels;

[0047] Fig.13 for Fig.10 Comparison of the escape rates of particles with different particle sizes in the two flow channels.

[0048] In the accompanying drawings: 1. water inlet; 2. flow channel; 201. first straight line segment; 202. first oblique line segment; 203. second oblique line segment; 204. third oblique line segment; 205. second straight line segment; 206. tooth angle; 207. tooth fillet radius, 208. flow channel width; 209. tooth height; 210. tooth spacing; 211. flow channel depth; 3. water outlet. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0050] The purpose of the embodiment of the present invention is to provide a large-area uniformly controlled and highly resistant to clogging emitter for drip irrigation, aiming to solve the problem of ultra-long-distance laying and ensure highly uniform irrigation and high clogging resistance.

[0051] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0052] Example 1

[0053] Figure 1A schematic diagram of the three-dimensional structure of the drip irrigation emitter provided in an embodiment of the present application.

[0054] Figure 4 A schematic diagram of tooth structure parameters provided in an embodiment of the present application.

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

[0056] Irrigator housing;

[0057] A water inlet 1, wherein the water inlet 1 is embedded in the central part of the sprinkler housing, and a sheet-type trash rack is provided at the bottom of the water inlet 1;

[0058] Wherein, a water outlet 3 is arranged at one side of the bottom of the water inlet 1, and the water outlet 3 is arranged inside the housing of the sprinkler;

[0059] The flow channel portion 2 has two sides connected with the water inlet portion 1 and the water outlet portion 3 respectively. The flow channel portion 2 is a toothed reciprocating structure. The flow channel portion 2 is composed of a plurality of flow channel units fixedly connected, and each of the flow channel units is toothed. The flow channel units are provided with a first straight segment 201, a first oblique segment 202, a second oblique segment 203, a third oblique segment 204 and a second straight segment 205 in sequence along the water flow direction.

[0060] The first straight line segment and the first oblique line segment form a water-facing surface to expand the distribution area of ​​the high-value area of ​​turbulent kinetic energy, and the second oblique line segment and the third oblique line segment form a water-retaining surface to reduce the distribution area of ​​the low-value area of ​​turbulent kinetic energy in the water-retaining area. The water-facing surface and the water-retaining surface are provided in multiple forms, and the multiple water-facing surfaces and the water-retaining surfaces are distributed in an inversely symmetrical cross array, and the flow channel width is between the water-facing surface and the water-retaining surface distributed in the inversely symmetrical cross array.

[0061] Figure 2 for Figure 1 Schematic diagram of the top view of the drip irrigation emitter.

[0062] Figure 3 for Figure 1 Schematic diagram of the structure of the drip irrigation emitter from above.

[0063] See also Figure 1-Figure 4 In the embodiment of the present invention, water flows through the water inlet portion 1 and enters the flow channel portion 2 and the water outlet portion 3 in sequence. The flow channel portion 2 is arranged on the top side of the inner part of the emitter housing. The water outlet portion 3 and the flow channel portion 2 both extend to arcs of equal radius at the top and bottom of the cross section perpendicular to the length direction of the emitter housing.

[0064] Example 2

[0065] Figure 1 A schematic diagram of the three-dimensional structure of the drip irrigation emitter provided in an embodiment of the present application.

[0066] Figure 4 A schematic diagram of tooth structure parameters provided in an embodiment of the present application.

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

[0068] Irrigator housing;

[0069] A water inlet 1, wherein the water inlet 1 is embedded in the central part of the sprinkler housing, and a sheet-type trash rack is provided at the bottom of the water inlet 1;

[0070] Wherein, a water outlet 3 is arranged at one side of the bottom of the water inlet 1, and the water outlet 3 is arranged inside the housing of the sprinkler;

[0071] The flow channel portion 2 has two sides connected with the water inlet portion 1 and the water outlet portion 3 respectively. The flow channel portion 2 is a toothed reciprocating structure. The flow channel portion 2 is composed of a plurality of flow channel units fixedly connected, and each of the flow channel units is toothed. The flow channel units are provided with a first straight segment 201, a first oblique segment 202, a second oblique segment 203, a third oblique segment 204 and a second straight segment 205 in sequence along the water flow direction.

[0072] Figure 5 A schematic diagram of flow channel structural parameters provided in an embodiment of the present application.

[0073] Figure 6 A schematic diagram of the flow channel depth parameter structure provided in an embodiment of the present application.

[0074] See also Figure 1 , Figure 4 and Figure 5-Figure 6 In an embodiment of the present invention, the flow channel unit is located inside the emitter housing, wherein the flow channel unit includes:

[0075] A first straight line segment 201, wherein the first straight line segment 201 is perpendicular to the overall flow direction of the water flow;

[0076] A first oblique line segment 202, wherein the first oblique line segment 202 is connected to the first straight line segment 201 at an obtuse angle;

[0077] A second oblique line segment 203, wherein a tooth angle 206 is formed between the second oblique line segment 203 and the first oblique line segment 202, wherein a fillet radius of the tooth angle 206 is in a range of 18°-38°, a fillet radius of the tooth angle 206 is in a range of 0.03-0.1 mm, and an axial direction of the tooth angle 206 is consistent with a direction of the first straight line segment 201, wherein a size range of the second oblique line 203 is 0.2-0.7 mm;

[0078] A third oblique line segment 204, wherein the third oblique line segment 204 is connected to the second oblique line segment 203 at an obtuse angle;

[0079] A second straight line segment 205, wherein the second straight line segment 205 is connected to the third oblique line segment 204 at an obtuse angle, and the obtuse angle formed by the second straight line segment 205 and the third oblique line segment 204 is in a range of 105°-165°, and the second straight line segment 205 is perpendicular to the overall direction of the water flow;

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

[0081] Example 3

[0082] Figure 1 A schematic diagram of the three-dimensional structure of the drip irrigation emitter provided in an embodiment of the present application.

[0083] Figure 4 A schematic diagram of tooth structure parameters provided in an embodiment of the present application.

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

[0085] Irrigator housing;

[0086] A water inlet 1, wherein the water inlet 1 is embedded in the central part of the sprinkler housing, and a sheet-type trash rack is provided at the bottom of the water inlet 1;

[0087] Wherein, a water outlet 3 is arranged at one side of the bottom of the water inlet 1, and the water outlet 3 is arranged inside the housing of the sprinkler;

[0088] The flow channel portion 2 has two sides connected with the water inlet portion 1 and the water outlet portion 3 respectively. The flow channel portion 2 is a toothed reciprocating structure. The flow channel portion 2 is composed of a plurality of flow channel units fixedly connected, and each of the flow channel units is toothed. The flow channel units are provided with a first straight segment 201, a first oblique segment 202, a second oblique segment 203, a third oblique segment 204 and a second straight segment 205 in sequence along the water flow direction.

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

[0090] Figure 8 for Figure 7 Comparison cloud chart of turbulent kinetic energy of two flow channels.

[0091] Fig. 9 for Figure 7 Comparison cloud diagram of particle trajectories in the two flow channels.

[0092] Fig.10 It is a geometric comparison diagram between the embodiment of the present application and the traditional flow channel.

[0093] Fig.11 for Fig.10 Comparison cloud chart of turbulent kinetic energy of two flow channels.

[0094] Fig.12 for Fig.10 Comparison cloud diagram of particle trajectories in the two flow channels.

[0095] Fig.13 for Fig.10 Comparison of the escape rates of particles with different particle sizes in the two flow channels.

[0096] See also Figure 1 , Figure 4 and Figure 7-Figure 8 In the embodiment of the present invention, the size of the first oblique line segment 202 is in the range of 0.15-0.4 mm, the first oblique line segment 202 and the second straight line segment 205 form an obtuse angle in the range of 105°-165°, and the flow channel unit further includes:

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

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

[0099] Tooth height 209, the tooth height 209 ranges from 0.6 to 0.9 mm;

[0100] Tooth spacing 210, the tooth spacing 210 ranges from 0.9 to 1.5 mm;

[0101] The flow channel depth 211 has a size range of 0.35-0.8 mm.

[0102] The first surface of the flow channel unit that contacts the water flow is the water-facing surface, which is a surface formed by the first straight line segment 201 and the first oblique line segment 202 that are perpendicular to the overall direction of the water flow. The vertical water-facing surface wall can expand the distribution area of ​​the high-value turbulent kinetic energy of the tooth tip and the wall. Opposite to the water-facing surface is the water-repelling surface, which is formed by the second oblique line segment 203 and the third oblique line segment 204. The multi-segment water-repelling surface can reduce the distribution area of ​​the low-value turbulent kinetic energy in the water-repelling area. There are multiple water-facing surfaces and water-repelling surfaces, and the multiple water-facing surfaces and water-repelling surfaces are distributed in an inversely symmetrical cross array, and the flow channel width is between the water-facing surface and the water-repelling surface distributed in the inversely symmetrical 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 in the present invention has good anti-clogging performance, through comparative analysis with the anti-clogging performance of the existing mainstream symmetrical tooth shape, the optimized design of the water-facing surface and the water-receiving 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 spacing, tooth height, flow channel depth and tooth angle fillet, etc., and numerically simulates the two under the condition that the boundary conditions remain unchanged (the inlet pressure is 0.1MPa and the outlet is free to flow), and the kinetic energy comparison cloud diagram is obtained as follows: Figure 8 As shown in FIG. 1 , it can be found that the optimized structure proposed in the present invention increases the proportion of high kinetic energy areas in the flow channel, which will enhance the collision effect of water flow in the flow channel, thereby preventing small particle impurities from depositing in the flow channel, and obtaining a particle migration trajectory comparison cloud map as shown in FIG. Fig. 9 As shown, it can be found that the time for particles to pass through the optimized flow channel structure of the present invention is only 0.22s, while particles of the same size have not escaped after 0.55s of migration in the N-type flow channel. The above demonstration can fully prove that the present invention proposes a structure that is superior to other types;

[0104] The present invention adopts an optimized structure and designs a large-area control and high-anti-clogging emitter in response to the current needs of the drip irrigation industry. In order to achieve a large-area control effect, a high-anti-clogging structure is adopted at the same time. The finalized product proposed by the present invention is also compared in depth with the traditional tooth-shaped products on the market. The flow channel structural parameters used in the comparative analysis include flow channel length, tooth angle, tooth spacing, tooth height, flow channel depth and tooth angle fillet, which are all consistent. The structures of the two flow channels are as follows Fig.10 As shown in the figure, under the condition of unchanged boundary conditions (inlet pressure is 0.1MPa, outlet free outflow), numerical simulation is performed on the two, and the turbulent kinetic energy comparison cloud diagram is obtained as follows Fig.11As shown in the enlarged view of the flow channel unit, it can be seen that the optimized structure proposed in the present invention has a larger proportion of high-value areas of turbulent kinetic energy (the less white area in the figure), which will make it possible to have greater anti-clogging performance even if the flow channel cross-sectional area is small, and particles are less likely to enter the low-speed area and thus deposit. The migration trajectories of particles of the same particle size in the two flow channels are as follows: Fig.12 As shown in the figure, it can be found that the particle escape time in the structure proposed by the present invention is only 0.32s, while the traditional structure can also achieve small flow irrigation, but the particle escape time is 3.84 times that of the present invention. In addition, the present invention uses particles of different particle sizes in two flow channels for simulation comparison tests, and the comparison results are shown in the figure. Fig.13 shown.

[0105] In summary:

[0106] In the drip irrigation large-area uniformly controlled and highly resistant to clogging emitter provided by the embodiment of the present invention, water flows into the flow channel unit through the first straight segment 201. At this time, the water flow will directly hit the vertical water-facing surface, thereby increasing the energy dissipation of the water flow inside the flow channel unit, and the other part of the water flow that has passed the vertical energy dissipation of 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 R0.04 rounded tooth tip, which has obvious energy dissipation effect, and will greatly extend the maximum laying distance of the drip irrigation belt, making up for the lack of emitters and drip irrigation belts for laying ultra-long distances in China.

[0107] The large-area uniformly controlled and highly anti-clogging emitter for drip irrigation provided by the embodiment of the present invention has a portion of water flowing toward the wall side after vertical energy dissipation on the water-facing surface to form a vortex area. The better the turbulence effect in the vortex area, the less likely particles are to deposit in the vortex area, thereby effectively improving the anti-clogging effect of the product. The water flows through the tooth tip efficiency into the multi-segment backwater area between the teeth, thereby greatly increasing the proportion of low-value areas in the backwater area, thereby increasing the escape rate of impurity particles in the flow channel and reducing the escape time, thereby further improving the anti-clogging performance of the product.

[0108] The large-area uniformly controlled and highly resistant to clogging emitter for drip irrigation provided by the embodiment of the present invention has each flow channel unit adopting the same structural form, and energy dissipation will gradually accumulate, thereby improving irrigation uniformity, so that the product can be laid over an ultra-long distance while having strong anti-clogging performance. This will be of great significance to prolonging 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. The water flows as a whole into the flow channel unit through the first straight line segment 201, that is, the water flows as a whole within the flow channel width 208. As the water flows as a whole continue to move, a portion of the water flows will directly hit the vertical water-facing surface first, and the reaction force of the water-facing surface will cause the water flows hitting the bottom side of the surface to collide with the water flows that gradually enter the flow channel unit, so that the turbulent kinetic energy of the water flows inside the flow channel unit is effectively increased;

[0111] S2. A part of the water flow that hits the top of the water-facing surface will move toward the back water surface formed by the second oblique line segment 203 and the third oblique line segment 204 under its reaction force, and collide with the water flow that gradually enters the flow channel width 208 under the reaction of the back water surface wall, forming 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, the first straight segment 201 is regarded as the next water-facing surface arranged in the opposite direction, and the water-facing surface is opposite to the water-receiving surface. As can be seen from the above, the turbulent kinetic energy and anti-blocking performance at the first straight segment 201 and the water-receiving surface of the multi-segment are further improved;

[0113] S4. At the same time, a portion of the water flow that hits the top of the vertical water-facing surface will flow into the next flow channel unit through the first oblique line segment 202 and the tooth fillet radius 207, and the maximum energy dissipation will occur at the tooth fillet radius 207, i.e., the tooth tip, effectively increasing 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 mix with the water flow on the reverse upstream surface and enter the multi-segment backwater surface opposite to the reverse upstream surface, so as to greatly increase the proportion of the low-value area in this backwater area, further ensuring the anti-clogging performance of the product.

[0115] This product sets the water-facing surface, back-to-water surface and tooth fillet radius distributed in an inversely symmetrical cross array, so that the vertical part of the water-facing surface gradually increases the energy dissipation of the water flow inside the flow channel unit, which helps to increase the turbulent kinetic energy of the water flow in the flow channel unit and form a vortex area at the back-to-water 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 mix with the water flow on the reverse water-facing surface. At this time, the water flow will produce the maximum energy dissipation at the tooth fillet radius, i.e., 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 back-to-water surface opposite to the reverse water-facing surface, so as to greatly increase the proportion of the low-value area in this back-to-water area, reduce the mutual coupling and coordination of the low values ​​in the back-to-water area, further ensure the anti-clogging performance of the product, and ensure the ultra-long distance laying and irrigation uniformity of the product, thereby improving the comprehensive performance and practicality of the product.

[0116] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-area uniform control and high anti-clogging emitter for drip irrigation, characterized by: The sprinkler comprises: Irrigator housing; A water inlet, which is embedded in the center of the sprinkler housing and has a sheet-type trash rack at the bottom; Wherein, a water outlet is arranged at one side of the bottom of the water inlet, and the water outlet is arranged inside the housing of the sprinkler; A flow channel portion, wherein the two sides of the flow channel portion are respectively connected to the water inlet portion and the water outlet portion, the flow channel portion is a tooth-shaped reciprocating structure, the flow channel portion is composed of a plurality of flow channel units fixedly connected, and each of the flow channel units is tooth-shaped, and the flow channel units are sequentially provided with a first straight line segment, a first oblique line segment, a second oblique line segment, a third oblique line segment, and a second straight line segment along the water flow direction; The first straight line segment and the first oblique line segment form a water-facing surface to expand the distribution area of ​​the high-value area of ​​turbulent kinetic energy, and the second oblique line segment and the third oblique line segment form a water-retaining surface to reduce the distribution area of ​​the low-value area of ​​turbulent kinetic energy in the water-retaining area. The water-facing surface and the water-retaining surface are provided in multiple forms, and the multiple water-facing surfaces and the water-retaining surfaces are distributed in an inversely symmetrical cross array, and the flow channel width is between the water-facing surface and the water-retaining surface distributed in the inversely symmetrical cross array.

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

3. A large-area uniform control and high anti-clogging emitter for drip irrigation according to claim 2, characterized in that: The water outlet portion and the flow channel portion are both arcs of equal radius at the top and bottom of the cross section perpendicular to the length direction of the emitter housing.

4. A large-area uniform control and high anti-clogging emitter for drip irrigation according to claim 3, characterized in that: The flow channel unit is located inside the emitter housing; The flow channel unit comprises: a first straight line segment, the first straight line segment is perpendicular to the overall flow direction of the water flow, a first oblique line segment, the first oblique line segment is connected to the first straight line segment at an obtuse angle, a second oblique line segment, a tooth angle is formed between the second oblique line segment and the first oblique line segment, and the tooth angle axis direction is consistent with the direction of the first straight line segment, a third oblique line segment, the third oblique line segment is connected to the second oblique line segment at an obtuse angle, and a second straight line segment, the second straight line segment is connected to the third oblique line segment at an obtuse angle, and the second straight line segment is perpendicular to the overall direction of the water flow; The fillet radius of the tooth angle is in the range of 18°-38°, the fillet radius of the tooth angle is in the range of 0.03-0.1 mm, wherein the size of the second oblique line is in the range of 0.2-0.7 mm; The obtuse angle formed by the second straight line segment and the third oblique line segment is in the range of 105°-165°.

5. A large-area uniform control and high anti-clogging emitter for drip irrigation according to claim 4, characterized in that: The size of the first straight line segment is in the range of 0.4-0.7 mm, and the obtuse angle formed by the first straight line segment and the first oblique line segment is in the range of 120°-165°.

6. A large-area uniform control and high anti-clogging emitter for drip irrigation according to claim 5, characterized in that: The size of the first oblique line segment is in the range of 0.15-0.4 mm, the obtuse angle between the first oblique line segment and the second straight line segment is in the range of 105°-165°, and the flow channel unit further includes: The flow channel width is in the range of 0.35-0.6 mm; a tooth fillet radius, wherein two sides of the tooth fillet radius are respectively connected to the first oblique line segment and the second oblique line segment; Tooth height, the tooth height ranges from 0.6 to 0.9 mm; Tooth spacing, the tooth spacing range is 0.9-1.5mm; The flow channel depth has a size range of 0.35-0.8 mm.

7. A large-area uniform control and high anti-clogging emitter for drip irrigation according to claim 6, characterized in that: The first surface of the flow channel unit that contacts the water flow is the water-facing surface, which is a surface formed by a first straight line segment and a first oblique line segment that are perpendicular to the overall direction of the water flow. The vertical water-facing surface wall can expand the distribution area of ​​the high-value turbulent kinetic energy area of ​​the tooth tip and the wall. Opposite to the water-facing surface is the back water surface, and the distribution area of ​​the low-value turbulent kinetic energy area in the back water area is reduced by the multi-segment back water surface.

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