A pressure-compensated rotary variable-flow drip irrigation emitter and irrigation method

Abstract

The present invention discloses a pressure-compensated rotary variable-flow-channel drip irrigation emitter and an irrigation method. It includes a limiting shaft inner cylinder fixedly arranged on the outer periphery of a drip irrigation pipe. A rotary outer cylinder is arranged on the outer periphery of the limiting shaft inner cylinder and is rotationally matched with it radially. A plurality of energy dissipation channels matched with its water passage are arranged on the outer periphery of the rotary outer cylinder, and the maze channel lengths in each group of energy dissipation channels are different. Through the limiting shaft inner cylinder and the rotary outer cylinder, the emitter of the present invention can change the energy dissipation channels according to the water pressure or flow rate, can quickly and conveniently adjust the drip irrigation flow rate of the emitter, and further control the flow rate of the emitter to ensure the stable water outflow of the emitter.

Description

Technical Field

[0001] The present invention relates to the field of the design of sub-irrigation emitters, and particularly to a pressure-compensated rotary variable-flow-channel drip emitter and an irrigation method. Background Art

[0002] Water-saving irrigation is the main irrigation method adopted in modern agriculture, especially in arid areas. As an advanced water-saving irrigation technology, micro-irrigation has been widely used in the irrigation of crops in arid areas. Through reasonable system design and efficient field management, micro-irrigation can achieve regular and appropriate irrigation of the crop roots, effectively reduce the evaporation of surface water, and greatly improve the utilization efficiency of irrigation water.

[0003] Pressure-compensated emitters have the advantages of a wide range of applications, good compensation effects, high irrigation uniformity, and strong anti-clogging ability. Therefore, pressure-compensated emitters have become a hot spot in the research and development of world emitters. At present, for pressure compensation on the market, its working principle is that when the pressure at the water inlet changes, the diaphragm and the structure change each other to keep the outlet flow rate stable. Its automatic pressure regulation makes the outflow stable and becomes one of the research focuses. However, this adjustment method has relatively high requirements for the structure itself, its structure design is complex, and it cannot directly increase or decrease the drip irrigation flow rate of the emitter according to actual needs. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above deficiencies and provide a pressure-compensated rotary variable-flow-channel drip emitter and an irrigation method, which can quickly and conveniently adjust the drip irrigation flow rate of the emitter and ensure the stable outflow of the emitter.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a pressure-compensated rotary variable-flow-channel drip emitter, which includes a limiting shaft inner cylinder fixedly arranged on the outer periphery of a drip irrigation pipe. A rotary outer cylinder is arranged on the outer periphery of the limiting shaft inner cylinder and is rotationally matched with it radially. A plurality of energy-dissipating flow channels are arranged on the outer periphery of the rotary outer cylinder and are matched with its water passage. The maze flow channel lengths in each group of energy-dissipating flow channels are different.

[0006] Preferably, an annular protrusion is arranged on the outer wall of the limiting shaft inner cylinder, and an annular groove is arranged on the inner wall of the rotary outer cylinder. The annular protrusion and the annular groove are slidably matched.

[0007] Preferably, water outlet holes are arranged on the surface of the drip irrigation pipe, water passing holes communicating with the water outlet holes are arranged on the surface of the limiting shaft inner cylinder, a water passage matched with the water passing holes is arranged on the surface of the rotary outer cylinder, and an inlet passage communicating with the water passage is arranged at the water inlet end of the energy-dissipating flow channel.

[0008] Preferably, the limiting shaft inner cylinder includes two inner shells. One inner shell is provided with first connecting convex teeth, and the other inner shell is provided with first connecting concave teeth. The first connecting convex teeth and the first connecting concave teeth are matched.

[0009] Preferably, the rotating outer cylinder includes two outer cylinders, one of which is provided with second connecting convex teeth and the other is provided with second connecting concave teeth, and the second connecting convex teeth and the second connecting concave teeth cooperate with each other.

[0010] Preferably, the energy dissipation flow channel includes a groove body. One end of the groove body is a water inlet end and is communicated with the side part of the water inlet channel. A trash rack is arranged at the bottom of the water inlet channel and is connected with the water passing channel of the rotating outer cylinder. The other end of the groove body is a drip irrigation outlet channel. A cover plate is arranged at the top of the groove body, and a labyrinth flow channel is arranged inside the groove body.

[0011] Preferably, the labyrinth flow channel includes a plurality of structural units connected in series. The structural unit is an isosceles trapezoidal prism structure, and water inlet holes are formed in the left and right sides thereof, and a water outlet hole is formed in the rear side thereof. The water inlet holes and the water outlet hole are communicated inside the structural unit.

[0012] Preferably, the edges of the structural unit are in a rounded corner structure.

[0013] In addition, the present invention also discloses an irrigation method for the pressure compensation rotary variable flow channel drip irrigation emitter, which includes the following steps:

[0014] S1: In the irrigation state, water flows out from the water outlet hole of the drip irrigation pipe, sequentially passes through the water passing hole and the water passing channel, and then enters the energy dissipation flow channel through the water inlet channel;

[0015] S2: Through the energy dissipation effect of the labyrinth flow channel in the energy dissipation flow channel, the water drips out from the drip irrigation outlet channel to carry out the irrigation process;

[0016] S3: When the flow rate of the water dripping out from the drip irrigation outlet channel is too low, the rotating outer cylinder can be rotated by a certain angle so that the water inlet end of the energy dissipation flow channel with a shorter labyrinth flow channel length is connected and communicated with the water passing channel and the water passing hole, so that the flow rate of the finally dripping water from the drip irrigation outlet channel increases;

[0017] S4: When the flow rate of the water dripping out from the drip irrigation outlet channel is too high, the rotating outer cylinder can be rotated by a certain angle so that the water inlet end of the energy dissipation flow channel with a longer labyrinth flow channel length is connected and communicated with the water passing channel and the water passing hole, so that the flow rate of the finally dripping water from the drip irrigation outlet channel decreases.

[0018] The beneficial effects of the present invention:

[0019] The maze flow channel of the present invention has excellent hydraulic performance. When the water pressure changes within a small range, the flow rate changes little. Secondly, the flow channel dissipates energy through vortices. The vortices can wash the side walls of the flow channel, suppressing the deposition of particles on the side walls and improving the anti-clogging performance of the emitter. Finally, through the inner cylinder of the limiting shaft and the rotating outer cylinder, the emitter can change the energy dissipation flow channel according to the water pressure or flow rate, quickly and conveniently adjusting the drip irrigation flow rate of the emitter, thereby controlling the flow rate of the emitter and ensuring the stable outflow of the emitter. The entire emitter has a simple structure, is easy to prepare, has a low cost, is convenient for large-scale production, and is more suitable for large-area and long-distance drip irrigation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an installation schematic diagram of a pressure-compensated rotary variable-flow-channel drip irrigation emitter;

[0021] Figure 2 is Figure 1 the three-dimensional exploded view of

[0022] Figure 3 is Figure 2 the three-dimensional exploded view of the rotating outer cylinder in

[0023] Figure 4 is Figure 1 the structural diagram showing multiple energy dissipation flow channels laid out flat in

[0024] Figure 5 is Figure 4 the three-dimensional exploded view of

[0025] Figure 6 is Figure 5 the structural schematic diagram of one of the energy dissipation flow channels from the bottom-up view in

[0026] Figure 7 is Figure 5 one of the structural schematic diagrams of the structural unit in

[0027] Figure 8 is Figure 7 the structural schematic diagram from another perspective;

[0028] Figure 9 is Figure 5 another structural schematic diagram of the structural unit after rounding the corners in

[0029] Figure 10 is Figure 9 the structural schematic diagram from another perspective;

[0030] Figure 11 is the calculation domain model diagram of four types of maze flow channels;

[0031] Figure 12 is Figure 11One of the velocity vector diagrams of the maze flow channel;

[0032] Figure 13 is Figure 12 Partial enlarged view of the velocity vector of the maze flow channel;

[0033] Figure 14 Partial enlarged view of the velocity vector of the maze flow channel corresponding to the structural unit with rounded corners;

[0034] Figure 15 is the pressure-flow relationship curve diagram of the water outlet of each type of maze flow channel;

[0035] Figure 16 is a diagram of the movement trajectory of sediment particles in a maze flow channel;

[0036] Figure 17 is another diagram of the movement trajectory of sediment particles in a maze flow channel with rounded corners. Specific implementation mode

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] As Figures 1 to 10 shown, a pressure-compensated rotary flow channel drip irrigation emitter includes a limiting shaft inner cylinder 1 fixedly arranged on the outer periphery of a drip irrigation pipe 4. An outer rotary cylinder 2 is arranged on the outer periphery of the limiting shaft inner cylinder 1 and is in radial rotational cooperation with it. A plurality of energy dissipation flow channels 3 are arranged on the outer periphery of the outer rotary cylinder 2 and are matched with its water passage 2.2. The lengths of the maze flow channels 3.6 in each group of energy dissipation flow channels 3 are different.

[0039] Preferably, an annular protrusion 1.1 is arranged on the outer wall of the limiting shaft inner cylinder 1, and an annular groove 2.1 is arranged on the inner wall of the outer rotary cylinder 2. The annular protrusion 1.1 is in sliding cooperation with the annular groove 2.1. In this embodiment, through the sliding cooperation of the annular protrusion 1.1 and the annular groove 2.1, the outer rotary cylinder 2 can rotate radially on the surface of the limiting shaft inner cylinder 1, so that the corresponding energy dissipation flow channel 3 on the outer periphery of the outer rotary cylinder 2 can be docked and communicated with the water passage 2.2 and the water hole 1.2.

[0040] Preferably, a water outlet hole 4.1 is arranged on the surface of the drip irrigation pipe 4, a water hole 1.2 communicated with the water outlet hole 4.1 is arranged on the surface of the limiting shaft inner cylinder 1, a water passage 2.2 matched with the water hole 1.2 is arranged on the surface of the outer rotary cylinder 2, and a water inlet passage 3.1 communicated with the water passage 2.2 is arranged at the water inlet end of the energy dissipation flow channel 3.

[0041] Preferably, the inner cylinder body 1 of the limiting shaft comprises two inner shells 1.3. One of the inner shells 1.3 is provided with a first connecting convex tooth 1.4, and the other inner shell 1.3 is provided with a first connecting concave tooth 1.5. The first connecting convex tooth 1.4 and the first connecting concave tooth 1.5 are matched. In this way, the installation process of the inner cylinder body 1 of the limiting shaft on the outer periphery of the drip irrigation pipe 4 can be facilitated.

[0042] Preferably, the outer rotating cylinder 2 comprises two outer shells 2.3. One of the outer shells 2.3 is provided with a second connecting convex tooth 2.4, and the other outer shell 2.3 is provided with a second connecting concave tooth 2.5. The second connecting convex tooth 2.4 and the second connecting concave tooth 2.5 are matched. In this way, the installation process of the outer rotating cylinder 2 on the outer periphery of the inner cylinder body 1 of the limiting shaft can be facilitated.

[0043] Preferably, as Figure 5 and 6 shown, the energy dissipation flow channel 3 comprises a groove body 3.2. One end of the groove body 3.2 is a water inlet end, which is communicated with the side part of the water inlet channel 3.1. A sewage interception grid 3.3 is arranged at the bottom of the water inlet channel 3.1 and is connected with the water passing channel 2.2 of the outer rotating cylinder 2. The other end of the groove body 3.2 is a drip irrigation outlet channel 3.4. A cover plate 3.5 is arranged at the top of the groove body 3.2, and a labyrinth flow channel 3.6 is arranged inside the groove body 3.2. In this embodiment, the sewage interception grid 3.3 can effectively prevent impurities in the water flow from entering the labyrinth flow channel 3.6 and prevent blockage thereof.

[0044] Preferably, as Figure 5 、 7 and 8 shown, the labyrinth flow channel 3.6 comprises a plurality of structural units 3.6.1 connected in series. The structural unit 3.6.1 is an isosceles trapezoidal prism structure, and water inlet holes 3.6.2 are formed in the left and right sides thereof, and a water outlet hole 3.6.3 is formed in the rear side thereof. The water inlet holes 3.6.2 and the water outlet hole 3.6.3 are communicated inside the structural unit 3.6.1. As Figure 12 shown, when the water flow enters the labyrinth flow channel 3.6, it passes through a plurality of structural units 3.6.1 in sequence. When passing through each structural unit 3.6.1, the water flow is divided into two strands and enters the structural unit 3.6.1 from the water inlet holes 3.6.2 on the left and right sides respectively, and then comes out from the water outlet hole 3.6.3 after counteracting and dissipating energy; as Figure 13 shown, there is also a vortex area between every two adjacent structural units 3.6.1. The vortex area can also play a role in energy dissipation. The flow velocity of each flow velocity layer in the vortex area varies greatly, and the energy is consumed by mixing and friction. The vortex intensity in the vortex area is relatively high, and the energy is consumed by scouring and friction with the side wall. Moreover, the larger the vortex area is, the stronger the vortex intensity is, and the stronger the wall washing effect is, and the deposition of particles on the side wall is inhibited.

[0045] Preferably, as Figure 9 and 10As shown, the edges of the structural unit 3.6.1 are provided with rounded corner structures. As Figure 14 shown, the maze flow channel 3.6 formed by combining the structural units 3.6.1 with such rounded corner structures is an improved maze flow channel, with increased eddy current intensity and reduced small flow velocity areas, improving the energy dissipation effect and anti-blocking performance of the maze flow channel.

[0046] As Figure 16 shown, in the Fluent software, a muddy water hydraulic performance simulation is carried out to obtain the movement route map of sediment particles in the flow channel. It is observed that the sediment particles mainly make swirling motions in the vortex cavity. Combining Figure 12 and 13 , the flow velocity in the central area of the vortex area in the vortex cavity is relatively small, and sediment is more likely to accumulate. However, due to the relatively large space in the vortex cavity, the emitter is not easily blocked. And during the rotation of the maze flow channel, the sediment is displaced to the side wall. When watering, the eddy current intensity in the outer layer of the vortex is relatively large, and the sediment-carrying capacity is relatively strong, which can clean the flow channel of the emitter. As Figure 17 shown, for the improved maze flow channel, the water flow turns relatively gently, and the included angle part is reduced, greatly improving the anti-blocking performance of the maze flow channel.

[0047] In addition, the present invention also discloses an irrigation method for the pressure-compensated rotary variable flow channel drip irrigation emitter, which includes the following steps:

[0048] S1: In the irrigation state, water flows out from the water outlet hole 4.1 of the drip irrigation pipe 4, successively passes through the water passing hole 1.2 and the water passing channel 2.2, and then enters the energy dissipation flow channel 3 through the water inlet channel 3.1;

[0049] S2: Through the energy dissipation effect of the maze flow channel 3.6 in the energy dissipation flow channel 3, the water flows out from the drip irrigation outlet channel 3.4 for the irrigation process;

[0050] S3: When the flow velocity of the water flowing out from the drip irrigation outlet channel 3.4 is too low, the rotary outer cylinder 2 can be rotated by a certain angle so that the water inlet end of the energy dissipation flow channel 3 with a shorter length of the maze flow channel 3.6 is connected and communicated with the water passing channel 2.2 and the water passing hole 1.2, so that the flow velocity of the finally flowing out water from the drip irrigation outlet channel 3.4 increases;

[0051] S4: When the flow velocity of the water flowing out from the drip irrigation outlet channel 3.4 is too high, the rotary outer cylinder 2 can be rotated by a certain angle so that the water inlet end of the energy dissipation flow channel 3 with a longer length of the maze flow channel 3.6 is connected and communicated with the water passing channel 2.2 and the water passing hole 1.2, so that the flow velocity of the finally flowing out water from the drip irrigation outlet channel 3.4 decreases.

[0052] Example 1: An emitter hydraulic performance test is carried out in the laboratory. The emitter adopts four groups of energy dissipation flow channels, and the lengths of the maze flow channels in each group of energy dissipation flow channels are different. The flow rates of the four types of maze flow channels under different pressures, asFigure 11 and 15 As shown in 15 , under the same pressure condition, the flow rate magnitudes of different models are ranked as Ⅰ>Ⅱ>Ⅲ>Ⅳ. At the same time, the flow state index of the emitter is 0.5012 - 0.5296. Among them, the flow state index of the Ⅰ-type labyrinth channel is 0.5296 and the flow coefficient is 6.403; the flow state index of the Ⅱ-type labyrinth channel is 0.5183 and the flow coefficient is 5.0773; the flow state index of the Ⅲ-type labyrinth channel is 0.5121 and the flow coefficient is 4.3242; the flow state index of the Ⅳ-type labyrinth channel is 0.5012 and the flow coefficient is 3.86. Its hydraulic performance is excellent. When the water pressure changes within a small range, the flow rate changes little and it has good pressure compensation performance. When the labyrinth channel model remains unchanged and the water pressure changes within a small range, the flow rate of the emitter changes little.

[0053] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations to the present invention. The embodiments in this application and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A pressure-compensated rotary variable-flow drip irrigation emitter, characterized in that: It includes a limiting shaft inner cylinder body (1) fixedly arranged on the outer periphery of a drip irrigation pipe (4). A rotating outer cylinder body (2) is arranged on the outer periphery of the limiting shaft inner cylinder body (1) and is in radial rotational fit therewith. A plurality of energy dissipation channels (3) cooperating with its water passing channels (2.2) are arranged on the outer periphery of the rotating outer cylinder body (2). The lengths of the labyrinth channels (3.6) in each group of energy dissipation channels (3) are different.

2. The pressure-compensated rotary variable-flow drip irrigation emitter according to claim 1, wherein: An annular protrusion (1.1) is arranged on the outer wall of the limiting shaft inner cylinder body (1), and an annular groove (2.1) is arranged on the inner wall of the rotating outer cylinder body (2). The annular protrusion (1.1) is in sliding fit with the annular groove (2.1).

3. The pressure-compensated rotary variable-flow drip irrigation emitter according to claim 1, characterized in that: Water outlet holes (4.1) are arranged on the surface of the drip irrigation pipe (4). Water passing holes (1.2) communicated with the water outlet holes (4.1) are arranged on the surface of the limiting shaft inner cylinder body (1). Water passing channels (2.2) cooperating with the water passing holes (1.2) are arranged on the surface of the rotating outer cylinder body (2). An inlet channel (3.1) communicated with the water passing channel (2.2) is arranged at the water inlet end of the energy dissipation channel (3).

4. The pressure-compensated rotary variable-flow drip irrigation emitter according to claim 1, characterized in that: The limiting shaft inner cylinder body (1) includes two inner shells (1.3). A first connecting convex tooth (1.4) is arranged on one inner shell (1.3), and a first connecting concave tooth (1.5) is arranged on the other inner shell (1.3). The first connecting convex tooth (1.4) and the first connecting concave tooth (1.5) cooperate with each other.

5. The pressure-compensated rotary variable-flow drip irrigation emitter according to claim 1, wherein: The rotating outer cylinder body (2) includes two outer shells (2.3). A second connecting convex tooth (2.4) is arranged on one outer shell (2.3), and a second connecting concave tooth (2.5) is arranged on the other outer shell (2.3). The second connecting convex tooth (2.4) and the second connecting concave tooth (2.5) cooperate with each other.

6. The pressure-compensated rotary variable-flow drip irrigation emitter according to claim 3, wherein: The energy dissipation channel (3) includes a groove body (3.2). One end of the groove body (3.2) is the water inlet end and is communicated with the side part of the inlet channel (3.1). A dirt retaining grid (3.3) is arranged at the bottom of the inlet channel (3.1) and is connected with the water passing channel (2.2) of the rotating outer cylinder body (2). The other end of the groove body (3.2) is a drip irrigation outlet channel (3.4). A cover plate (3.5) is arranged on the top of the groove body (3.2). A labyrinth channel (3.6) is arranged in the groove body (3.2).

7. A pressure-compensated rotary variable-flow drip irrigation emitter according to claim 6, characterized in that: The labyrinth channel (3.6) includes a plurality of structural units ( 3.6.1) connected in series. The structural unit (3.6.1) is an isosceles trapezoidal prism structure. Water inlet holes (3.6.2) are opened on its left and right sides, and a water outlet hole (3.6.3) is opened on its rear side. The water inlet holes (3.6.2) and the water outlet hole (3.6.3) are communicated inside the structural unit (3.6.1).

8. A pressure-compensated rotary variable-flow drip irrigation emitter according to claim 7, characterized in that: The edges of the structural unit (3.6.1) are in a rounded corner structure.

9. A method for irrigation of the pressure-compensated rotary variable-flow drip irrigation emitter according to any one of claims 1 to 8, characterized in that: It includes the following steps: S1: In the irrigation state, water flows out from the water outlet holes (4.1) of the drip irrigation pipe (4), successively passes through the water passing holes (1.2) and the water passing channels (2.2), and then enters the energy dissipation channel (3) through the inlet channel (3.1); S2: Through the energy dissipation effect of the labyrinth channel (3.6) in the energy dissipation channel (3), the water drips out from the drip irrigation outlet channel (3.4) to carry out the irrigation process. S3: When the flow rate of water dripping out from the drip irrigation outlet channel (3.4) is too low, the rotating outer cylinder (2) can be rotated by a certain angle so that the water inlet end of the energy dissipation channel (3) with a shorter maze channel (3.6) is connected and communicated with the water passing channel (2.2) and the water passing hole (1.2), so as to increase the flow rate of the final water dripping out from the drip irrigation outlet channel (3.4); S4: When the flow rate of water dripping out from the drip irrigation outlet channel (3.4) is too high, the rotating outer cylinder (2) can be rotated by a certain angle so that the water inlet end of the energy dissipation channel (3) with a longer maze channel (3.6) is connected and communicated with the water passing channel (2.2) and the water passing hole (1.2), so as to reduce the flow rate of the final water dripping out from the drip irrigation outlet channel (3.4).

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