High-blocking-resistance ultrathin-wall single-wing labyrinth type drip irrigation flow channel, drip irrigation tape and drip irrigation system thereof

Abstract

The invention relates to a high anti-blocking ultrathin-wall single-wing labyrinth type drip irrigation flow channel, a drip irrigation tape and a drip irrigation system thereof, the high anti-blocking ultrathin-wall single-wing labyrinth type drip irrigation flow channel comprises a plurality of water inlets, a plurality of labyrinth units and a plurality of water outlets, each labyrinth unit comprises upper teeth and lower teeth which are arranged in a staggered mode, the height of each upper tooth is 1.25-1.35 mm, the width of each upper tooth is 2.35-2.45 mm, and the height of each lower tooth is 1.25-1.35 mm. The corner of the upper tooth runner is 119-122 degrees, and the upper tooth runner is connected by a circular arc with the radius of 0.5 mm; the height of the lower teeth is 0.2-0.3 mm higher than that of the upper teeth, the width of the lower teeth is 0.05-0.08 mm narrower than that of the upper teeth, the runner corner of the lower teeth is 1-5 degrees smaller than that of the upper teeth, the lower teeth and the upper teeth are connected through an arc with the radius of 0.4 mm, the staggered value of the runner teeth is 0.24-0.26 mm, and the distance between the upper teeth and the lower teeth is 2.80-2.90 mm. The single-wing labyrinth flow channel with the upper tooth structure and the lower tooth structure different is adopted, the flow speed of the side wall of the changed flow channel is obviously higher than that of an initial flow channel, retention of sediment particles in the side wall area is reduced, sediment is not prone to being deposited at the corner of the flow channel, and the anti-blocking performance of the flow channel is enhanced.

Description

Technical Field

[0001] The invention relates to a highly anti-clogging ultra-thin-wall single-wing labyrinth-type drip irrigation channel, a drip irrigation belt and a drip irrigation system thereof, belonging to drip irrigation equipment. Background Art

[0002] Drip irrigation, as a water-saving irrigation method, has been widely studied and applied by countries around the world. Drip irrigation uses a low-pressure pipeline system to transport irrigation water to the field, and then through the energy dissipation of the drip irrigation belt on the capillary tube, the irrigation water reaches the soil near the root system of the crop in a regular, quantitative, slow and uniform manner, so that it can always maintain the most suitable water, fertilizer, gas and heat content for plant growth and development. Compared with traditional irrigation methods, drip irrigation belongs to local irrigation. It does not need to wet the entire soil. It only meets the water demand of crops by wetting the soil at the root of the crop. Under the condition of ensuring the normal growth of crops, it greatly saves irrigation water and improves the efficiency of water resource utilization. At the same time, drip irrigation can be used in combination with liquid fertilizers, which can well realize the integration of water and fertilizer. The reasonable use of water and fertilizer integration can promote the growth of crops and improve the quality of crops, and has very good development prospects. The single-wing labyrinth drip irrigation belt is a hose belt made of polyethylene as the main raw material, which is made by extrusion, blow molding, vacuum thermoforming, segmentation, cooling and winding. There is a drip hole at a certain distance, and the use cycle is a crop growth period. The key to the drip irrigation belt's ability to drip water is the vacuum heat-synthesized process. One side of the drip irrigation belt is formed into a maze-like, very fine flow channel connected to the drip hole, and there are 5 or 8 water inlets. The tiny size and narrow internal flow channel of the drip irrigation belt make them prone to blockage, which has become a major obstacle to the advancement of drip irrigation technology. In order to increase the anti-blocking performance of the drip irrigation belt, in addition to treating the water quality of the irrigation water source, changing the internal flow channel structure of the drip irrigation belt is one of the ways. There are many factors that affect the hydraulic performance and anti-blocking performance of drip irrigation products. The flow channels used in existing studies are all in the same upper and lower tooth structure. The overall anti-blocking effect is average for the influence of the flow channel angle, flow channel width, flow channel depth, tooth stagger value, tooth height, number of teeth, tooth spacing, tooth bottom distance, tooth shape, etc. on the blockage of the flow channel. Summary of the invention

[0003] The invention provides a highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation channel, a drip irrigation belt and a drip irrigation system thereof, which solve the problems of serious blockage, low flow index and short service life of the existing drip irrigation belt with consistent upper and lower tooth structures.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation channel comprises a plurality of water inlets, a plurality of labyrinth units and a plurality of water outlets, wherein the labyrinth units comprise staggered upper teeth and lower teeth, wherein the height of the upper teeth is 1.25-1.35 mm, the width of the upper teeth is 2.35-2.45 mm, the flow channel turning angle of the upper teeth is 119-122° and the teeth are connected by an arc with a radius of 0.5 mm; the height of the lower teeth is 0.2-0.3 mm higher than the height of the upper teeth, the width of the lower teeth is 0.05-0.08 mm narrower than the width of the upper teeth, the flow channel turning angle of the lower teeth is 1-5° smaller than the flow channel turning angle of the upper teeth and the teeth are connected by an arc with a radius of 0.4 mm, the flow channel tooth stagger value is 0.24-0.26 mm, and the spacing between the upper and lower teeth is 2.80-2.90 mm.

[0005] Further, preferably: the height of the upper teeth is 1.3mm, the width of the upper teeth is 2.40mm, the upper tooth flow channel angle is 121° and is connected with an arc with a radius of 0.5mm, the height of the lower teeth is 1.5mm, the width of the lower teeth is 2.35mm, the lower tooth flow channel angle is 119° and is connected with an arc with a radius of 0.4mm; the flow channel tooth deviation value is 0.25mm, and the flow channel tooth spacing is 2.85mm.

[0006] Furthermore, preferably: the number of the water inlets is 1-8, and the number of the water outlets is 1-5.

[0007] Furthermore, preferably: the number of the water inlets is 3-5, and the water inlets are respectively arranged at different positions of the maze unit.

[0008] Furthermore, preferably, the number of the maze units is 80-90.

[0009] The present invention also provides a highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation belt, comprising a drip irrigation belt body, on which a plurality of single-wing labyrinth drip irrigation channels are arranged, and the spacing between adjacent single-wing labyrinth drip irrigation channels is 25-35 cm, and the water inlet of the single-wing labyrinth drip irrigation channel is connected to the drip irrigation belt body.

[0010] Furthermore, preferably: it also includes a plurality of flow channel flushing mechanisms arranged on the drip irrigation belt body.

[0011] Further, preferably: the flow channel flushing mechanism includes a main flushing pipe, which is connected to the flushing port at the end of the water inlet of each single-wing labyrinth drip irrigation channel through a branch flushing pipe, and the flushing port is provided with an elastic sealing sheet, which seals the flushing port during drip irrigation, and is deformed by the high-pressure gas during flushing to seal the water inlet channel, and the inlet end of the main flushing pipe is provided with a sealing cover.

[0012] Furthermore, preferably: a magnetic support rod is arranged inside the elastic sealing sheet, a magnetic mechanism corresponding to the magnetic support rod is arranged on the single-wing labyrinth drip irrigation channel, and a blocking block is arranged on the water inlet channel.

[0013] The present invention also provides a highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation system, comprising the single-wing labyrinth drip irrigation belt and a flushing mechanism, wherein the flushing mechanism comprises an air pump.

[0014] Beneficial effects of the present invention: The present invention adopts a single-wing labyrinth flow channel with different upper and lower tooth structures. Compared with the traditional single-wing labyrinth flow channel with the same upper and lower tooth structures, the flow velocity of the main channel of the changed flow channel is increased, the flow rate is significantly increased compared with the initial flow channel, and the turbulent kinetic energy is increased. The increase in flow rate and turbulent kinetic energy will increase the ability of water flow to carry sediment, the flow velocity in the eddy zone is increased, and the flow velocity of the side wall of the changed flow channel is significantly higher than that of the initial flow channel, which reduces the retention of sediment particles in the side wall area, and sediment is not easy to deposit at the corners of the flow channel, thereby enhancing the anti-clogging performance of the flow channel.

[0015] The present invention is provided with a flow channel flushing mechanism to clean the flow channel with gas or cleaning liquid, which can effectively reduce the obstruction of the flow channel and increase the service life of the drip irrigation belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a single-wing labyrinth drip irrigation channel of the present invention; Figure 2 for Figure 1 A magnified view of part A; Figure 3 This is a schematic diagram of the structure of the single-wing labyrinth drip irrigation channel of Comparative Example 1; Figure 4 It is a three-dimensional structural diagram of a single-wing labyrinth drip irrigation belt of the present invention; Figure 5 It is a cross-sectional structural diagram of the single-wing labyrinth drip irrigation belt of the present invention; Figure 6 It is a three-dimensional structural diagram of another single-wing labyrinth drip irrigation belt of the present invention; Figure 7 It is a three-dimensional structural diagram of another single-wing labyrinth drip irrigation belt of the present invention; Figure 8It is a cross-sectional structural diagram of another single-wing labyrinth drip irrigation belt of the present invention; Fig. 9 for Figure 8 A magnified view of part B; Fig.10 It is a physical cross-sectional view of the drip irrigation tape of different embodiments; Fig.11 It is a structural block diagram of the drip irrigation system of the present invention; Fig.12 is the numerical simulation result of the SST k-ω turbulent flow channel of the present invention; Fig.13 The muddy water service life results of the drip irrigation pipes prepared in different embodiments.

[0018] In the figure, 1 is the water inlet, 2 is the labyrinth unit, 3 is the water outlet, 4 is the upper tooth, 5 is the lower tooth, 6 is the upper tooth flow channel corner, 7 is the lower tooth flow channel corner, 8 is the drip irrigation belt body, 9 is the single-wing labyrinth drip irrigation flow channel, 10 is the flow channel flushing mechanism, 11 is the main flushing pipe, 12 is the sealing cover, 13 is the water inlet channel, 14 is the elastic sealing sheet, 15 is the magnetic mechanism, 16 is the magnetic support rod, 17 is the blocking block, 18 is the water pump, 19 is the air pump, 20 is the check valve, 21 is the water meter, 22 is the fertilizer tank, 23 is the fertilizer injection pump, 24 is the pressure gauge, 25 is the filter, 26 is the main pipe, 27 is the air pipe, 28 is the branch pipe, 29 is the single-wing labyrinth drip irrigation belt, 30 is the regulating valve, and 31 is the branch flushing pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 like Figure 1 and 2 As shown, a highly resistant to blocking ultra-thin wall single-wing labyrinth type drip irrigation channel comprises a plurality of water inlets 1, a plurality of labyrinth units 2 and a plurality of water outlets 3. The water inlets 1, the labyrinth units 2 and the water outlets 3 can be selected according to actual conditions. If the water contains a lot of sediment, more water inlets 1 and water outlets 3 and fewer labyrinth units 2 are selected. If the water contains a little sediment, fewer water inlets 1 and water outlets 3 and more labyrinth units 2 are selected. In this embodiment, 5 water inlets 1, 85 labyrinth units 2 and 3 water outlets 3 are used.

[0021] The labyrinth unit 2 includes staggered upper teeth 4 and lower teeth 5, wherein the height of the upper teeth 4 is 1.25-1.35 mm, the width of the upper teeth 4 is 2.35-2.45 mm, the upper tooth flow channel angle 6 is 119-122° and is connected by an arc with a radius of 0.5 mm; the height of the lower teeth 5 is 0.2-0.3 mm higher than the height of the upper teeth 4, the width of the lower teeth 5 is 0.05-0.08 mm narrower than the width of the upper teeth 4, the lower tooth flow channel angle 6 is 1-5° smaller than the upper tooth flow channel angle 6 and is connected by an arc with a radius of 0.4 mm, the flow channel tooth staggered value is 0.24-0.26 mm, and the upper and lower tooth spacing is 2.80-2.90 mm.

[0022] The structure of the upper and lower teeth can be designed within a reasonable range of the present invention according to the actual water conditions. In this embodiment, the height of the upper teeth is 1.3mm, the width of the upper teeth is 2.40mm, the flow channel angle of the upper teeth is 121° and connected by an arc with a radius of 0.5mm, the height of the lower teeth is 1.5mm, the width of the lower teeth is 2.35mm, the flow channel angle of the lower teeth is 119° and connected by an arc with a radius of 0.4mm; the flow channel tooth stagger value is 0.25mm, and the flow channel tooth spacing is 2.85mm. The width of the upper teeth = flow channel tooth spacing - upper tooth bottom width = 2.85-0.45 = 2.40mm; the width of the lower teeth = flow channel tooth spacing - lower tooth bottom width = 2.85-0.50 = 2.35mm.

[0023] Comparative Example 1 like Figure 3 As shown, it is basically the same as Example 1, except that: the maze unit 2 includes upper teeth and lower teeth that are staggered, and the upper and lower teeth have the same structure. The height of the upper teeth is 1.5mm, the width of the upper teeth is 2.35mm, the upper tooth flow channel angle is 119° and connected with an arc with a radius of 0.4mm; the height of the lower teeth is 1.5mm, the width of the lower teeth is 2.35mm, the lower tooth flow channel angle is 119° and connected with an arc with a radius of 0.4mm, the flow channel tooth stagger value is 0.25mm, and the flow channel tooth spacing is 2.85mm.

[0024] The SST k-ω turbulence model was used to perform numerical simulation on the flow channels of Example 1 and Comparative Example 1 to study the changing law of the flow field, as follows: The SST k-ω turbulence model is used to close the Navier-Stokes equations, and the velocity-pressure coupling solution is realized by the SIMPLE algorithm. The mobile phase is set to a water flow density of 998.2 kg / m³, the inlet boundary is a pressure inlet, the relative pressure is 100 kPa, the turbulence parameter is set to a turbulence intensity of 5%, the hydraulic diameter is automatically calculated according to the characteristic length, the outlet boundary is a pressure outlet, the relative pressure is 0 kPa, and the outside is atmospheric pressure. The wall boundary is a no-slip wall, and the standard wall function is used to deal with the flow in the near-wall area. The spatial discretization adopts the second-order upwind scheme to improve the calculation accuracy, and the time term adopts implicit steady-state iteration. The convergence criterion for the calculation residual is 10 5 , and at the same time monitor the outlet flow velocity fluctuation less than 0.5% as an auxiliary convergence criterion.

[0025] The core formula of the SST k-ω model is: Turbulent kinetic energy equation (k):

[0026] Specific dissipation rate equation (ω):

[0027] Turbulent viscosity ( ):

[0028] Default constants: ,

[0029] The results are as follows Fig.12 shown.

[0030] Fig.12 Middle: Comparative Example 1: The upper and lower flow channels are symmetrical in size, with a rated flow rate of 1.7 L / h; Improved flow channel in Example 1: The tooth height of the upper flow channel was adjusted (reduced by 15%) and the corner curvature (increased by 20%), and the rated flow rate was increased to 2.3 L / h (increased by 35.3%). The two flow channels maintained the same total length of 285 mm, inlet and outlet dimensions, and overall width of 31 mm.

[0031] The following key parameter distributions are obtained through CFD numerical simulation: Pressure field distribution: The pressure drop gradient of the main channel of the improved flow channel is increased compared with the prototype, and the pressure peak area migrates to the middle of the flow channel, reducing the area of ​​the local high-pressure zone on the side wall.

[0032] Velocity field characteristics: The core flow velocity of the main channel increased from 1.2 m / s to 1.65 m / s (an increase of 37.5%), the flow and kinetic energy transfer efficiency were significantly improved, the smoothness of the main channel streamlines was improved, and the carrying capacity of the water flow for solid particles was increased while ensuring the energy dissipation effect, thereby improving the sand discharge capacity of the drip irrigation belt; the mean flow velocity in the side wall area increased from 0.18 m / s to 0.28 m / s, effectively suppressing the thickening of the boundary layer; at the same time, the volume proportion of the eddy zone was reduced, reducing the deposition range of sediment particles.

[0033] Example 2 like Figure 6 As shown, it is basically the same as Example 1, except that there are five water inlets 1, three of which are arranged at the water inlet end of the flow channel, and the remaining two are arranged on the maze unit 2 at a certain distance from the water inlet end. This embodiment uses a maze unit 2 13 times away from the water inlet end.

[0034] Example 3 like Figure 4 , 5 As shown in Figure 10, a highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation belt comprises a drip irrigation belt body 7. The drip irrigation belt body is a plastic tube. The inner diameter of the plastic tube is generally set to 10-18 mm as required. In this embodiment, 16 mm is used. The drip irrigation belt body 7 is provided with a plurality of single-wing labyrinth drip irrigation channels 9. The number of single-wing labyrinth drip irrigation channels 9 is set according to the length of the drip irrigation belt. The spacing between adjacent single-wing labyrinth drip irrigation channels 9 is 25-35 cm. In this embodiment, 30 cm is used. The single-wing labyrinth drip irrigation channel 9 is fixed to the drip irrigation belt body 7 by an embedded patch or heat-sealed method. In this embodiment, the embedded patch is used to fix the drip irrigation belt body 7. The water inlet 1 of the single-wing labyrinth drip irrigation channel 9 is connected to the drip irrigation belt body 7.

[0035] The structure of the single-wing labyrinth drip irrigation channel 9 is the same as that of the first embodiment and will not be described again.

[0036] Example 4 like Figure 6 As shown, it is the same as Example 3, except that the structure of the single-wing labyrinth drip irrigation channel 9 is the same as that of Example 2 and will not be described again.

[0037] Example 5 like Figure 7 , 8 As shown in 10 , the embodiment 3 is the same as that in the embodiment 3, except that the drip irrigation belt further includes a plurality of flow channel flushing mechanisms 10 arranged on the drip irrigation belt body 7 .

[0038] The flow channel flushing mechanism includes a main flushing pipe 11, which is connected to the flushing port at the end of the water inlet 1 of each single-wing labyrinth drip irrigation flow channel 9 through a branch flushing pipe 31. The flushing port is provided with an elastic sealing sheet 14, which seals the flushing port during drip irrigation, is deformed by high-pressure gas during flushing, and seals the water inlet channel 13. The inlet end of the main flushing pipe 11 is provided with a sealing cover 12. The elastic sealing sheet 14 can be made of the same plastic sheet as the drip irrigation belt body 7, and is formed integrally with the drip irrigation belt body 7. Each backwashing mechanism corresponds to a number of single-wing labyrinth drip irrigation flow channels 9. Generally, according to the length of the drip irrigation belt and the length of the flow channel, a flow channel flushing mechanism 10 is provided every 3, 4, 5, 6...10 meters. In this embodiment, a flow channel flushing mechanism 10 is provided every 5 meters.

[0039] A magnetic support rod 16 is provided in the elastic sealing sheet 14, which is generally made of iron wire. A magnetic mechanism 15 corresponding to the magnetic support rod 16 is provided on the single-wing labyrinth drip irrigation channel 9, which is generally made of a permanent magnet. A blocking block 17 is provided on the water inlet channel 13. The magnetic support rod 16 and the magnetic mechanism 15 can increase the sealing performance and prevent water from entering and infiltrating the main flushing pipe 11 during drip irrigation. The main flushing pipe 11 can also be negatively pressurized during drip irrigation, and the flushing port can be sealed together with the elastic effect of the elastic sealing sheet 14.

[0040] Comparative Example 2 like Figure 2 and 10 As shown, it is basically the same as Example 1, except that the maze unit 2 of Comparative Example 1 is used.

[0041] like Fig.10 As shown, Comparative Examples 2-3 use other drip irrigation tapes on the market. The specific drip irrigation tape structure is as follows Fig.10 .

[0042] The anti-blocking test was carried out on the drip irrigation tapes of Examples 3-5 and Comparative Examples 2-3, as follows:

[0043] Experimental Platform The test was conducted on a plugging test platform, which consists of a water source, a head hub and a water delivery network. Referring to the current conventional drip irrigation system model, the filter selected for the test platform is 120 mesh. The water source is provided by a cylindrical water storage tank with a rated volume of 100L. To ensure the uniformity of sand-containing water, a gear reduction motor (power 750W, output speed 130R / min) is installed above the water storage tank. The motor is connected to the impeller through a rigid support to mix the sediment evenly; the head hub consists of a variable frequency pump (power 400W, output flow 2.5m3 / h, head 35m), valves, laminated filters (BALDR, 120 mesh), and precision electronic pressure gauges (0.4 level, range 0.25MPa); the water delivery network is a rectangle of 80cm×250cm, and 5 2.5m drip irrigation belts can be installed in the middle, arranged at equal intervals, and 5 measuring cups (rated volume 500ml) are placed under each drip irrigation belt for water collection.

[0044] Experimental Design and Methods The experiment was conducted in the drip irrigation test hall of the Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences. The experiment set up three muddy water sources with concentration gradients (1g / L) and the test pressure was 0.1MPa. The muddy water source was artificially prepared with sandy water. The sand was naturally air-dried and ground, passed through a 120-mesh sieve (aperture 0.125mm), and then mixed with water to prepare sandy water with a specific sand concentration. The specific sand particle composition is shown in Table 1.

[0045] Table 1 Mechanical composition of initial sediment particles Particle size μm 0.500 1.000 2.000 5.000 10.00 20.00 45.00 75.00 100.0 200.0 Cumulative ratio% 0.23 1.86 4.51 10.91 17.53 29.77 65.32 88.73 96.46 100.0 Before the muddy water test, the basic parameters of each drip irrigation belt were measured and its hydraulic performance was tested (refer to the method in GB / T 19812.1-2017). The results are shown in Table 2.

[0046] Drip irrigation belt anti-clogging performance test: The indoor muddy water test adopts a short-cycle intermittent muddy water test method, and the working pressure is controlled at 0.1MPa. In order to achieve dynamic balance of the flow state and sediment deposition movement inside the drip irrigation belt, the duration of a single irrigation is 1.5h, and the interval between adjacent irrigations is 0.5h. Before the end of each irrigation, the valve is adjusted to stabilize the indication of the pressure gauge at 0.1MPa, and then the flow of each dripper of the capillary tube is measured, and the average flow of the drip irrigation belt is calculated. When the average relative flow rate drops to 75%, the test is stopped. The drip irrigation belt flow rate is determined by the measuring cylinder method. The water output of the drip irrigation belt before the end of each irrigation is collected by a measuring cup (the collection time is 5min), and the water volume in each measuring cup is measured with a measuring cylinder, which is converted into the drip irrigation belt flow rate (L / h).

[0047] To ensure the uniformity of muddy water in the water tank during filling, the mixer on the water tank keeps working. After each set of treatment tests, the test platform is flushed and confirmed to be free of sediment, and then a new drip irrigation belt is replaced to repeat the above process.

[0048] Drip irrigation belt anti-clogging service life test: The indoor muddy water test adopts a short-cycle intermittent muddy water test method, with the working pressure controlled at 0.1MPa and the muddy water source at 3g / L. The drip irrigation simulation test is carried out between 9:00 and 12:00 every morning for 30 days. During the experiment, the daily irrigation time is 30 minutes. In order to achieve dynamic balance of the flow state and sediment deposition movement inside the drip irrigation belt, the single irrigation duration is 0.5h. Before each irrigation, the valve is adjusted to stabilize the pressure gauge reading at 0.1MPa, and then the flow rate of each dripper of the capillary tube is measured to calculate the average flow rate of the drip irrigation belt. The drip irrigation belt is cleaned with clean water every three days after irrigation.

[0049] Use 0.1MPa clean water to flush the pipe, the flow rate is 0.6 m / s to clean the drip irrigation pipe, and the cleaning time of a single drip irrigation pipe is 5min. After cleaning, measure the average relative flow rate, and then continue the blockage test. If the average relative flow rate after cleaning drops to 75%, stop the test.

[0050] The drip irrigation belt of Example 5 first uses high-pressure gas to clean the flow channel, using 0.11 MPa gas for 3 minutes, and then 0.1 MPa clean water to flush the pipeline, with a flow rate of 0.6 m / s, and cleaning for 2 minutes. To ensure the uniformity of muddy water in the water tank during irrigation, the mixer on the water tank continues to work during irrigation. After each group of treatment tests, the test platform is rinsed, and after confirming that there is no sediment residue, a new drip irrigation belt is replaced and the above process is repeated.

[0051] Evaluation indicators and measurement methods 1) Evaluation index of drip tape anti-clogging performance: In drip irrigation system, average relative flow rate and irrigation uniformity are generally used as evaluation indexes of drip tape anti-clogging performance. Average relative flow rate (Dra) is used to determine the flow change of drip tape, and Christiansen uniformity coefficient (Cu) is used to characterize the irrigation uniformity of drip irrigation. The flow rate of drip tape is determined by measuring cylinder method. The water output of drip tape before each irrigation is completed is collected by measuring cup (collection time is 5 minutes). The water volume in each measuring cup is measured by measuring cylinder and converted into drip tape flow rate (L / h).

[0052] The average relative flow rate (average discharge ratio variation) Dra is defined as the percentage of the average flow rate of a drip irrigation belt to the rated flow rate. The calculation formula is: (1) Where: —Observed flow rate of the i-th sampling drip irrigation belt, L / h; —The average value of the drip irrigation tape flow rate at the sampling point before the test, L / h; n—The number of drip irrigation tapes at the sampling point. When calculating the average flow ratio of a single drip irrigation tape, n=1.

[0053] The average relative flow rate Dra of the drip irrigation belt reflects the degree of reduction in the average flow rate of the drip irrigation belt. When Dra decreases by more than 25% (Dra<75%), the drip irrigation belt is considered to be blocked. The smaller Dra is, the greater the degree of attenuation of the drip irrigation belt flow and the more serious the blockage.

[0054] Experimental results: 1. Basic parameters of drip irrigation tape Table 2 Related parameters of different drip irrigation belts Inner diameter(mm) Spacing(mm) Wall thickness (mm) Number of water inlets Number of outlets Rated flow rate (L / h) Flow index (m) Flow coefficient (k) Flow rate coefficient of variation (Cv) Example 3 15.8 308 0.19 5 3 2.39 0.52 0.213 5.2% Example 4 16.0 310 0.20 5 3 2.41 0.52 0.212 5.1% Example 5 15.9 306 0.19 5 3 2.38 0.52 0.208 5.2% Comparative Example 2 16.1 312 0.21 5 3 2.38 0.52 0.218 5.2% Comparative Example 3 16.1 309 0.22 8 5 3.20 0.55 0.251 3.4% 2. Anti-clogging performance of drip irrigation belt Table 3 Drip irrigation time results of drip irrigation pipes prepared in different embodiments Example 3 Example 4 Example 5 Comparative Example 3 Comparative Example 4 Drip irrigation time / h 186 198 243 156 104.5 Compared with comparative example 2, the improvement rate / % 19.2 26.9 55.8 Compared with comparative example 3, the improvement rate / % 78.0 89.5 132.5 As shown in Table 3, the drip irrigation belt of Example 3 has a significantly improved drip irrigation time by designing an asymmetric upper and lower tooth structure compared with the traditional drip irrigation belt. Example 4 can effectively reduce the sediment deposition at the water inlet by setting water inlets at different positions, and effectively improve its drip irrigation time. Example 5 adopts the method of adding a flow channel cleaning mechanism, which can effectively improve its drip irrigation time. However, compared with Examples 3 and 4, its structure is more complicated and the manufacturing cost is high, but its improvement rate is also high, and it can be selected according to the actual water quality.

[0055] 3. Anti-clogging service life of drip irrigation belt Table 4 and Fig.13 This is the result of the muddy water service life of the drip irrigation hose using 3g / L muddy water.

[0056] Table 4 The results of the muddy water service life of the drip irrigation pipes prepared in different embodiments Drip irrigation days / d 0 3 6 9 12 15 18 21 24 27 30 Example 3 Average relative flow rate / % 100 99.6 98.2 97.4 95.1 92.8 86.6 85.3 83.1 80.6 78.4 Example 4 Average relative flow rate / % 100 100 99.4 98.8 99.1 97.6 96.2 90.8 85.7 82.4 80.6 Example 5 Average relative flow rate / % 100 99.8 99.6 99.1 99.5 98.6 97.9 96.3 95.7 88.3 84.6 Comparative Example 2 Average relative flow rate / % 100 99.4 97.5 94.3 92.1 82.7 80.6 78.5 74.5 68.4 62.8

[0057] From Table 4 and Fig.13 It can be seen that during the entire test period, the average flow rate of the drip irrigation belt decreases to varying degrees as the number of irrigation days increases. The present invention can effectively reduce sediment deposition and prevent the flow channel from being blocked by providing a flow channel and a flow channel flushing mechanism with different upper and lower tooth structures.

[0058] The performance indicators of the drip irrigation pipe belt prepared in Example 3 were measured, as shown in Table 5.

[0059] Table 5 Performance indicators of the drip irrigation pipe belt prepared in Example 3 Serial number Inspection items Technical indicators Test results 1 Opaqueness The drip irrigation tape should be opaque Opaque 2 Inner diameter, mm 16±0.3 15.8 3 Wall thickness, mm 0.18～0.24 0.19～0.20 4 Drip hole spacing, mm 300±15 290 5 Average flow deviation Should be within the range of ±7% +4.5% 6 Flow rate variation coefficient Cv Should not exceed 7% 4.7% 7 Water pressure resistance (150kPa, 1h) No leakage, no damage No leakage, no damage 8 Burst pressure, kPa Not less than 200 394.2 9 Pull-out resistance (tensile force 110N) No damage occurs, and the change in the spacing between markings before and after the test is no more than 5% Meet the standard requirements 10 Black content, % （2.25±0.5）% 1.77% 11 Black dispersion ≤3 level Level 1.9

[0060] Example 6 like Fig.11 As shown, a highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation system comprises the single-wing labyrinth drip irrigation belt and a flushing mechanism, wherein the flushing mechanism comprises an air pump.

[0061] The drip irrigation system of the present invention is essentially the same as the traditional drip irrigation system, and generally includes a water pump 18, a check valve 20, a water meter 21, a pressure gauge 24, a filter 25, a main pipe 26, a branch pipe 28, a regulating valve 30, a fertilizer tank 22, and a fertilizer injection pump 23, etc. The branch pipe is connected to the single-wing labyrinth drip irrigation belt 29 of the present invention. The specific equipment connection method is not described in detail.

[0062] If the sediment in the water is relatively large, when the drip irrigation tape of Example 5 of the present invention is used, it is necessary to cooperate with the flow channel flushing system and set an air pump 19, which is connected to the sealing cover of the flow channel flushing mechanism on the drip irrigation tape through the air pipe 27.

[0063] There are two ways to clean the flow channel according to the actual situation: one is to set the drip irrigation belt in the field for a long time, and use drip irrigation for a period of time, move the air pump, and clean the drip irrigation belt section by section; or each flow channel flushing mechanism can be connected to the air pump through an air pipe, and the air pump can be turned on for cleaning after a period of time.

[0064] In another case, the drip irrigation belt is not set in the field for a long time. When the drip irrigation belt is put away, the flow channel is flushed section by section. This embodiment adopts an air pipe and each flow channel flushing mechanism to perform in-situ flushing.

[0065] The drip irrigation belt structure of the present invention can effectively reduce the blockage of the flow channel by sediment and increase the service life of the drip irrigation belt.

[0066] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation channel, characterized by: It comprises a plurality of water inlets, a plurality of labyrinth units and a plurality of water outlets, wherein the labyrinth units comprise staggered upper teeth and lower teeth, wherein the height of the upper teeth is 1.25-1.35 mm, the width of the upper teeth is 2.35-2.45 mm, the flow channel turning angle of the upper teeth is 119-122° and they are connected by an arc with a radius of 0.5 mm; the height of the lower teeth is 0.2-0.3 mm higher than the height of the upper teeth, the width of the lower teeth is 0.05-0.08 mm narrower than the width of the upper teeth, the flow channel turning angle of the lower teeth is 1-5° smaller than the flow channel turning angle of the upper teeth and they are connected by an arc with a radius of 0.4 mm, the flow channel tooth stagger value is 0.24-0.26 mm, and the spacing between the upper and lower teeth is 2.80-2.90 mm.

2. According to claim 1, a highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation channel is characterized in that: The height of the upper teeth is 1.3mm, the width of the upper teeth is 2.40mm, the upper tooth flow channel angle is 121° and is connected with an arc with a radius of 0.5mm, the height of the lower teeth is 1.5mm, the width of the lower teeth is 2.35mm, the lower tooth flow channel angle is 119° and is connected with an arc with a radius of 0.4mm; the flow channel tooth staggered value is 0.25mm, and the flow channel tooth spacing is 2.85mm.

3. A highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation channel according to claim 1 or 2, characterized in that: The number of the water inlets is 1-8, and the number of the water outlets is 1-5.

4. A highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation channel according to claim 1 or 2, characterized in that: There are 3 to 5 water inlets, which are respectively arranged at different positions of the maze unit.

5. A highly anti-clogging ultra-thin-wall single-wing labyrinth drip irrigation channel according to claim 1 or 2, characterized in that: The number of the maze units is 80-90.

6. A highly anti-clogging ultra-thin wall single-wing labyrinth drip irrigation belt, characterized by: It comprises a drip irrigation belt body, on which are arranged a plurality of single-wing labyrinth drip irrigation channels as described in claims 1-5, the spacing between adjacent single-wing labyrinth drip irrigation channels is 25-35 cm, and the water inlet of the single-wing labyrinth drip irrigation channel is connected to the drip irrigation belt body.

7. The high-blockage-resistant ultra-thin-wall single-wing labyrinth drip irrigation belt according to claim 6 is characterized by: It also includes a plurality of flow channel flushing mechanisms arranged on the drip irrigation belt body.

8. The high-blockage-resistant ultra-thin-wall single-wing labyrinth drip irrigation belt according to claim 7, characterized in that: The flow channel flushing mechanism includes a main flushing pipe, which is connected to the flushing port at the end of the water inlet of each single-wing labyrinth drip irrigation flow channel through a branch flushing pipe. The flushing port is provided with an elastic sealing sheet, which seals the flushing port during drip irrigation and is deformed by high-pressure gas during flushing to seal the water inlet channel. The inlet end of the main flushing pipe is provided with a sealing cover.

9. The high-blockage-resistant ultra-thin-wall single-wing labyrinth drip irrigation belt according to claim 8, characterized in that: A magnetic support rod is arranged inside the elastic sealing sheet, a magnetic mechanism corresponding to the magnetic support rod is arranged on the single-wing labyrinth drip irrigation channel, and a blocking block is arranged on the water inlet channel.

10. A highly anti-clogging ultra-thin wall single-wing labyrinth drip irrigation system, characterized in that: It comprises the single-wing labyrinth drip irrigation belt and flushing mechanism as described in any one of claims 6 to 9, wherein the flushing mechanism comprises an air pump.

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