Low flow drip irrigation control system and method

Abstract

This invention relates to a low-flow drip irrigation control system and method. A plurality of outlet holes are evenly distributed on the main drip irrigation pipeline. An outlet pipe is installed within each outlet hole. An outlet hole clamping and sealing plate is fixedly installed on the outer wall of the outlet pipe end located within the main drip irrigation pipeline. A flow control inlet ball with an inlet hole is fixedly installed above the outlet hole clamping and sealing plate. A flow control box is installed outside the main drip irrigation pipeline. A connecting sleeve is installed at the center of the inner cavity of the flow control box. The connecting sleeve is fitted onto the outside of the outlet pipe. The outer wall of the main drip irrigation pipeline surrounding the outlet holes is clamped between the outlet hole clamping and sealing plate and the flow control box. A low-flow control device is installed inside and outside the flow control box. The flow control of drip irrigation is achieved using the external flow control box, which is replaceable and maintainable. The drip irrigation modes are diverse, and the flow controllable range is wide.

Description

Technical Field

[0001] This invention belongs to the field of water-saving drip irrigation technology, specifically relating to a low-flow drip irrigation control system and method. Background Technology

[0002] Drip irrigation is a water-saving irrigation method that delivers water to the soil through orifices or drippers in capillary tubes to meet the water needs of crops. While drip irrigation plays a vital role in water conservation, it also has several drawbacks. These drawbacks are mainly manifested in the following ways: First, traditional drip irrigation systems often use integrated sprinkler heads installed on pipelines. With the sprinkler head and pipeline connected as a whole, physical or other forms of blockage can easily occur over time, causing the entire sprinkler head to fail, the capillary tubes to lose their irrigation function and become unusable, and the entire pipeline needs to be replaced, resulting in resource waste. Second, in traditional sprinkler irrigation systems, leaks are prone to occur at the sprinkler head connection points, leading to changes in water supply demand and an inability to control water flow according to actual needs, resulting in water waste. These leaks worsen over time, eventually causing the system to fail. Third, traditional drip irrigation technology relies on a single drip irrigation mode based on water pressure and volume supply. It cannot achieve low-flow drip irrigation control through sprinkler head structural design. Its control relies mainly on water pressure and pump pressure for flow control, which has many limitations and cannot meet the needs of low-flow drip irrigation control and flow switching control for crops. In addition, traditional multi-hole sprinkler pipes suffer from incomplete filtration, which can lead to backflow and blockage due to the increase of excess water during use, causing many inconveniences.

[0003] Therefore, a small-flow drip irrigation control system and method is proposed that is simple in structure, easy to operate, not prone to clogging, has a long service life, can replace and disassemble the nozzles for cleaning, effectively saves water resources, can implement small-flow control and flow switching according to needs, offers various drip irrigation methods, is not prone to backflow clogging, has good sealing effect, and is simple and easy to operate, and has broad market prospects. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a small-flow drip irrigation control system and method that is simple in structure, easy to operate, not prone to clogging, has a long service life, allows for the replacement and cleaning of nozzles, effectively saves water resources, enables small-flow control and flow switching according to needs, offers diverse drip irrigation methods, is not prone to backflow clogging, has good sealing performance, and is simple and easy to operate, thus overcoming the deficiencies of existing technologies.

[0005] The technical solution of this invention is implemented as follows: A small-flow drip irrigation control system includes a variable frequency booster pump connected to a main pipeline, a controller connected to the variable frequency booster pump, a filter connected to the outlet end of the variable frequency booster pump, and a drip irrigation main pipeline connected to the filter. Several outlet holes are evenly distributed on the drip irrigation main pipeline. An outlet pipe is installed in each outlet hole. An outlet hole clamping and sealing plate is fixedly installed on the outer wall of the outlet pipe end located within the drip irrigation main pipeline. A flow control inlet ball with an inlet hole is fixedly installed above the outlet hole clamping and sealing plate. A flow control box is provided outside the drip irrigation main pipeline. A connecting sleeve is installed at the center of the inner cavity of the flow control box. The connecting sleeve is fitted onto the outside of the outlet pipe. The outer wall of the drip irrigation main pipeline around the outlet holes is clamped between the outlet hole clamping and sealing plate and the flow control box. A small-flow control device is installed inside and outside the flow control box.

[0006] Furthermore, the small flow control device includes a flow control partition horizontally disposed in the middle of the flow control box, which divides the flow control box into upper and lower chambers. The two chambers are connected by a connecting hole provided on the flow control partition. The bottom of the connecting sleeve is connected to the lower chamber. A sealing nut sleeve is fitted at the center of the bottom plate of the flow control box, and an adjusting control bolt is installed inside the sealing nut sleeve. A flow rate sealing head that matches the inner diameter of the connecting sleeve is installed in the lower chamber. The top of the adjusting control bolt is connected to the flow rate sealing head. The outer walls of the flow control box corresponding to the upper and lower chambers are respectively provided with an upper liquid outlet and a lower liquid outlet. The liquid dispenser has an upper and lower outlet, the inner ends of which are connected to the upper and lower chambers respectively through inlets. Both the upper and lower outlets are equipped with transverse diversion baffles. A transverse diversion cavity connected to the inlet is set in front of two adjacent transverse diversion baffles. The other end of the transverse diversion cavity is connected to the inner longitudinal diversion cavity. A longitudinal diversion baffle is set on the outside of the inner longitudinal diversion cavity. A longitudinal diversion hole is set on the longitudinal diversion baffle. An outer longitudinal diversion cavity is set on the outside of the longitudinal diversion baffle. The outer longitudinal diversion cavity is connected to the inner longitudinal diversion cavity through the longitudinal diversion hole. Both the upper and lower outlets are equipped with outlet nozzles.

[0007] Furthermore, the outlet clamping and sealing piece is a ring-shaped structure with a trapezoidal cross-section. The upper diameter of the outlet clamping and sealing piece is not greater than its lower diameter, and the lower diameter of the outlet clamping and sealing piece is not less than the diameter of the outlet. The flow control inlet convex ball is a hollow hemispherical structure. The diameter of the flow control inlet convex ball is equal to the diameter of the outlet. The inner cavity of the drip irrigation main pipe is connected to the inner cavity of the flow control inlet convex ball through the inlet hole, and the inner cavity of the flow control inlet convex ball is connected to the inner cavity of the outlet pipe.

[0008] Furthermore, the outer diameter of the outlet pipe matches the inner diameter of the connecting sleeve, and the outlet pipe and the connecting sleeve are connected by threads or fastening insertion. The length of the outlet pipe is not greater than the length of the connecting sleeve.

[0009] Furthermore, the connecting sleeve is longitudinally fixedly installed at the top center of the flow control box. The top of the connecting sleeve is an open structure that communicates with the outside. The flow control box is a square or cylindrical cavity structure, and a soil insertion support rod is provided at the bottom of the flow control box.

[0010] Furthermore, the connecting sleeve is fitted at the center of the flow control baffle, and the bottom outlet of the connecting sleeve is located in the longitudinal middle of the lower chamber. The bottom of the water flow sealing head is connected to the top of the adjusting control bolt through the sealing connecting piece. The sum of the heights of the water flow sealing head and the sealing connecting piece is not greater than half the depth of the lower chamber. The water flow sealing head is a conical truncated structure with a smaller top and a larger bottom. The bottom diameter of the water flow sealing head is not less than the inner diameter of the connecting sleeve.

[0011] Furthermore, the length of the upper liquid outlet is not less than the length of the lower liquid outlet. Both the upper and lower liquid outlets are directional box structures, and the upper and lower liquid outlets are distributed alternately or correspondingly on the outer wall of the flow control box.

[0012] Furthermore, the nozzle is provided with a nozzle diversion cavity that communicates with the outer longitudinal diversion cavity, and a nozzle baffle is provided on the outer wall of the nozzle. The nozzle baffle is provided with a drip irrigation outlet hole that communicates with the nozzle diversion cavity.

[0013] A control method for a low-flow-rate drip irrigation control system as described above, the method being as follows:

[0014] The controller controls the variable frequency booster pump, setting preset pressure and flow values ​​according to the crop's water requirements. The irrigation liquid transported by the main pipeline is output, filtered, and then delivered to the drip irrigation main pipeline. The irrigation liquid enters the inner cavity of the flow control inlet ball through the inlet hole from the inner cavity of the drip irrigation main pipeline, and then enters the outlet pipe through the inner cavity of the flow control inlet ball. The bottom of the outlet hole clamping and sealing plate and the top of the flow control box clamp the outer wall of the outlet hole to prevent liquid leakage. The irrigation liquid enters the connecting sleeve from the bottom of the outlet pipe and is output from the bottom of the connecting sleeve. During the output process, the position of the water flow sealing head in the bottom inner cavity of the connecting sleeve is adjusted by tightening the adjusting control bolt. When the adjusting control bolt is rotated counterclockwise, the water flow sealing head moves away from the connecting sleeve, and the water flow of the connecting sleeve increases. When the adjusting control bolt is rotated clockwise, the water flow sealing head moves closer to the connecting sleeve, and the water flow of the connecting sleeve decreases. The irrigation liquid enters the lower chamber after exiting from the bottom of the connecting sleeve.

[0015] When the variable frequency booster pump controls a small irrigation liquid flow rate, the irrigation liquid is delivered from the inlet in the lower chamber to the transverse diversion chamber in the lower outlet. The transverse diversion baffle diverts the liquid, which then flows into the inner longitudinal diversion chamber. From there, it flows through the longitudinal diversion holes on the baffle into the outer longitudinal diversion chamber, and finally exits through the outlet nozzle and drip irrigation outlet. When the variable frequency booster pump controls a large irrigation liquid flow rate, a portion of the irrigation liquid is delivered from the inlet in the lower chamber to the transverse diversion chamber in the lower outlet. The transverse diversion baffle diverts the liquid... The liquid is diverted and then enters the inner longitudinal diversion chamber. It flows into the outer longitudinal diversion chamber through the longitudinal diversion holes set on the longitudinal diversion baffle, and finally exits through the outlet diversion chamber and the drip irrigation outlet. At the same time, another part of the irrigation liquid enters the upper chamber through the connecting hole, and then is transported to the transverse diversion chamber in the upper outlet through the liquid inlet set in the upper chamber. The transverse diversion baffle diverts the liquid, and then it enters the inner longitudinal diversion chamber. It flows into the outer longitudinal diversion chamber through the longitudinal diversion holes set on the longitudinal diversion baffle, and finally exits through the outlet diversion chamber and the drip irrigation outlet.

[0016] The present invention has the following positive effects:

[0017] 1. First, this invention utilizes a filter and a flow-control inlet convex ball to perform multiple filtrations on the irrigation liquid, ensuring the filtration effect of the incoming liquid. Simultaneously, it uses the inlet hole, the flow-control inlet convex ball, and the outlet pipe to implement an initial liquid pressure change. Liquid in the main drip irrigation pipe is discharged through the smaller-diameter inlet hole to the inner cavity of the flow-control inlet convex ball and the inner cavity of the outlet pipe, achieving a change in liquid output pressure. Then, it is output to the larger lower chamber through the bottom of the connecting sleeve, achieving pressure transformation. Liquid output for drip irrigation is achieved through the inlet, transverse diversion chamber, inner longitudinal diversion chamber, outer longitudinal diversion chamber, and outlet nozzle. The entire process is designed to prevent clogging, has a long service life, and utilizes an external flow control box for drip irrigation flow control. It is replaceable and maintainable.

[0018] 2. This invention features a liquid outlet clamping and sealing piece with a diameter larger than that of the liquid outlet. It employs a trapezoidal ring structure, allowing it to smoothly pass through the liquid outlet and into the inner cavity of the main drip irrigation pipe during installation. The liquid outlet then blocks the main drip irrigation pipe. After the flow control box is installed, the main drip irrigation pipe outside the liquid outlet is closed and clamped between the liquid outlet clamping and sealing piece and the flow control box, thus sealing the liquid outlet and preventing leakage or seepage. This facilitates pressure stability and flow control during drip irrigation, while also extending the service life of the capillary tube.

[0019] 3. During the irrigation process, the water pressure and flow rate can be adjusted and controlled according to the water requirements of the crop. At the same time, the combination of the upper and lower liquid outlets with the variable frequency booster pump can achieve small flow rate control of the liquid. The liquid outlet drip irrigation mode is diverse and the flow rate is controllable over a wide range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the system connection structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the drip irrigation main pipeline connection structure of the present invention.

[0022] Figure 3 For the present invention Figure 2 A schematic diagram of the internal structure.

[0023] Figure 4 For the present invention Figure 2 A top-view structural diagram.

[0024] Figure 5 This is a top view of the flow control box of the present invention.

[0025] Figure 6 This is a bottom view of the flow control box structure of the present invention.

[0026] Figure 7 This is a top view of the internal structure of the flow control box of the present invention.

[0027] Figure 8 This is a three-dimensional structural diagram of the liquid outlet tube of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the following description of the invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" simply indicates a connection between devices and has no special meaning.

[0030] like Figure 1 , 2As shown in Figures 3, 4, 5, 6, 7, and 8, a low-flow drip irrigation control system includes a variable frequency booster pump 2 connected to a main pipeline 3, a controller 1 connected to the variable frequency booster pump 2, a filter 4 connected to the outlet end of the variable frequency booster pump 2, and a drip irrigation main pipeline 5 connected to the filter 4. The drip irrigation main pipeline 5 has several evenly distributed outlet holes, and an outlet pipe 20 is installed in each outlet hole. An outlet hole clamp is fixedly installed on the outer wall of the end of the outlet pipe 20 located in the drip irrigation main pipeline 5. A sealing plate 18 is provided, and a flow control inlet ball 16 with an inlet hole 17 is fixedly installed above the sealing plate 18. A flow control box 6 is provided outside the main drip irrigation pipe 5. A connecting sleeve 21 is installed at the center of the inner cavity of the flow control box 6. The connecting sleeve 21 is fitted outside the outlet pipe 20. The outer wall of the main drip irrigation pipe 5 around the outlet hole is clamped between the sealing plate 18 and the flow control box 6. Small flow control devices are installed inside and outside the flow control box 6. The small flow control device includes a flow control partition 22 horizontally arranged in the middle of the flow control box 6, which divides the flow control box 6 into upper and lower chambers. The two chambers are connected by a connecting hole 23 on the flow control partition 22. The bottom of the connecting sleeve 21 is connected to the lower chamber. A sealing nut sleeve 10 is fitted at the center of the bottom plate of the flow control box 6, and an adjusting control bolt 19 is installed inside the sealing nut sleeve 10. A water flow sealing head 24 that matches the inner diameter of the connecting sleeve 21 is installed in the lower chamber. The top of the adjusting control bolt 19 is connected to the water flow sealing head 24. An upper liquid outlet 7 and a lower liquid outlet 8 are respectively provided on the outer wall of the flow control box 6 corresponding to the upper and lower chambers. The inner ends of both the upper and lower outlet devices 7 and 8 are connected to the upper and lower chambers respectively through the inlet 26. Both the upper outlet device 7 and the lower outlet device 8 are provided with transverse diversion baffles 27. A transverse diversion cavity 28 connected to the inlet 26 is provided in front of the two adjacent transverse diversion baffles 27. The other end of the transverse diversion cavity 28 is connected to the inner longitudinal diversion cavity 29. A longitudinal diversion baffle 30 is provided on the outside of the inner longitudinal diversion cavity 29. A longitudinal diversion hole 14 is provided on the longitudinal diversion baffle 30. An outer longitudinal diversion cavity 15 is provided on the outside of the longitudinal diversion baffle 30. The outer longitudinal diversion cavity 15 is connected to the inner longitudinal diversion cavity 29 through the longitudinal diversion hole 14. Both the upper outlet device 7 and the lower outlet device 8 are provided with outlet nozzles 12.

[0031] Specifically, the variable frequency booster pump 2 can preset water pressure and flow rate according to usage requirements to meet the needs of drip irrigation operations with different water demands. The filter 4 purifies and filters the irrigation water source to prevent blockage of the pipes and drip irrigation ends. The outlet hole is a circular through hole, and the main drip irrigation pipe 5 is a flexible pipe, saving costs. During drip irrigation operation, the flow control box 6 is located below the main drip irrigation pipe 5, and the irrigation water directly irrigates the soil surface. When installing the outlet pipe 20, the outlet hole clamping and sealing piece is first inserted into the outlet hole. During the insertion process, an inclined angle is used to avoid damaging the outlet hole. The flow control inlet protrusion 16 extends into the interior of the main drip irrigation pipe 5 and is connected through the inlet hole 17. The flow control box 6 as a whole realizes the control of the incoming water for drip irrigation operations. It is connected to the outlet pipe 20 through the connecting sleeve 21. After connection, the internal cavity of the flow control box 6 is connected to the main drip irrigation pipe 5 through the connecting sleeve 21 and the outlet pipe 20.

[0032] The small flow control device can distribute irrigation liquid. It introduces irrigation liquid into the lower chamber through the connecting sleeve 21. During the introduction of irrigation water, the displacement of the outlet sealing head 24 within the connecting sleeve 21 is achieved by adjusting the tightening and loosening of the control bolt 19 within the sealing nut sleeve 10. The upper and lower chambers are separated by a flow control partition 22, which has a connecting hole 23 that connects the two chambers. The two chambers are used for different drip irrigation flow control. During lower flow drip irrigation, only the lower chamber is activated. By adjusting the water pressure and flow rate, a smaller amount of liquid enters the flow control box 6, and the irrigation water is retained in the lower chamber. It then enters the transverse diversion chamber 28 of the lower outlet 8 through the inlet 26 on the lower chamber. Under the obstruction of the transverse diversion baffle 27, the water is diverted and flows into the inner longitudinal diversion chamber 29. It then enters the outer longitudinal diversion chamber 15 through the longitudinal diversion hole 14 on the longitudinal diversion baffle 30 and is output from the outlet nozzle 12 on the lower outlet 8. Through multiple chamber switching, drip irrigation with lower flow rate and lower water pressure is achieved.

[0033] During high-flow drip irrigation, both the upper and lower chambers are activated. By adjusting the water pressure and flow rate, a larger volume of liquid enters the flow control box 6. While the irrigation water is being dripped from the lower chamber, another portion of the irrigation water enters the upper chamber through the connecting hole 23. This water then flows through the inlet 26 on the upper chamber into the transverse diversion chamber 28 of the upper outlet 7. Blocked by the transverse diversion baffle 27, the water is diverted and flows into the inner longitudinal diversion chamber 29. From there, it enters the outer longitudinal diversion chamber 15 through the longitudinal diversion hole 14 on the longitudinal diversion baffle 30 and is output from the outlet nozzle 12 on the upper outlet 7. Through multiple chamber switching processes, high-flow-rate and high-pressure irrigation liquid is controlled for drip irrigation.

[0034] The outlet clamping and sealing piece 18 is a trapezoidal ring structure. The upper diameter of the outlet clamping and sealing piece 18 is not greater than its lower diameter, and the lower diameter is not less than the diameter of the outlet. The flow control inlet convex ball 16 is a hollow hemispherical structure. The diameter of the flow control inlet convex ball 16 is equal to the diameter of the outlet. The inner cavity of the drip irrigation main pipe 5 is connected to the inner cavity of the flow control inlet convex ball 16 through the inlet hole 17. The inner cavity of the flow control inlet convex ball 16 is connected to the inner cavity of the outlet pipe 20. The outer diameter of the outlet pipe 20 matches the inner diameter of the connecting sleeve 21. The outlet pipe 20 and the connecting sleeve 21 are connected by threads or a fastening insertion method. The length of the outlet pipe 20 is not greater than the length of the connecting sleeve 21. The connecting sleeve 21 is longitudinally fixed at the top center of the flow control box 6. The top of the connecting sleeve 21 is an open structure that connects to the outside. The flow control box 6 is a square or cylindrical cavity structure. A soil insertion support rod 9 is provided at the bottom of the flow control box 6.

[0035] Specifically, the unique mechanism of the outlet clamping sealing piece 18 ensures that its bottom seals and blocks the outlet position after installation, preventing liquid from leaking out. The flow control inlet protrusion 16 adopts a spherical structure, enabling further filtration at the inlet position. The outlet pipe 20 must maintain a tight seal after connecting to the connecting sleeve 21 to prevent liquid leakage. A threaded or fastened connection ensures a good seal. The length of the outlet pipe 20 is no greater than the length of the connecting sleeve 21, ensuring sufficient space at the bottom of the connecting sleeve 21 for the insertion of the water flow sealing head 24. When in use, the top of the flow control box 6 is fitted to fit the bottom of the drip irrigation main pipe 5. This ensures that after the connecting sleeve 21 installed inside the flow control box 6 is connected to the outlet pipe 20 exposed at the bottom of the drip irrigation main pipe 5, the bottom of the outlet hole clamping and sealing piece 18 can clamp the outer wall of the drip irrigation main pipe 5 around the outlet hole. This clamping can fit with the top of the flow control box 6 to ensure a sealing effect.

[0036] The connecting sleeve 21 is fitted at the center of the flow control baffle 22. The bottom outlet of the connecting sleeve 21 is located in the longitudinal middle of the lower chamber. The bottom of the outlet flow sealing head 24 is connected to the top of the adjusting control bolt 19 through the sealing connecting piece 25. The sum of the heights of the outlet flow sealing head 24 and the sealing connecting piece 25 is not greater than half the depth of the lower chamber. The outlet flow sealing head 24 is a conical truncated cone structure with a smaller top and a larger bottom. The bottom diameter of the outlet flow sealing head 24 is not less than the inner diameter of the connecting sleeve 21. The length of the upper liquid outlet 7 is not less than the length of the lower liquid outlet 8. Both the upper liquid outlet 7 and the lower liquid outlet 8 are directional box structures. The upper liquid outlet 7 and the lower liquid outlet 8 are distributed alternately or correspondingly on the outer wall of the flow control box 6. The nozzle 12 has a nozzle diversion cavity 31 that communicates with the outer longitudinal diversion cavity 15. The outer wall of the nozzle 12 is provided with a nozzle baffle 13, and the nozzle baffle 13 is provided with a drip irrigation outlet hole 32 that communicates with the nozzle diversion cavity 31.

[0037] Specifically, the bottom length of the connecting sleeve 21 should not be too long, to allow space for the movement of the outlet sealing head 24. The sealing connecting piece 25 provides support for the installation of the outlet sealing head 24. The outlet sealing head 24 adopts a conical truncated structure that is smaller at the top and larger at the bottom. When its upper part extends into the connecting sleeve 21, it will block the inner cavity of the connecting sleeve 21. Irrigation liquid flows out through the top outer wall of the outlet sealing head 24. When the adjusting control bolt 19 is fully tightened, the bottom of the outlet sealing head 24 will seal the bottom of the connecting sleeve 21, and the drip irrigation operation will stop. This scenario is suitable for drip irrigation density control, selectively opening and closing several flow control boxes 6 on the drip irrigation main pipeline 5 to achieve drip irrigation density control. After tightening the adjusting control bolt 19 on one or more flow control boxes 6, the liquid outlet of the corresponding connecting sleeve 21 will be cut off, without affecting the drip irrigation liquid outlet operation of other flow control boxes 6.

[0038] The upper outlet 7 and the lower outlet 8 are of different lengths. Since this product is installed on the upper part of the soil surface, after being connected via the soil insertion support rod 9, the flow control box 6 is located between the soil surface and the main drip irrigation pipe 5. Drip irrigation requires vertical layering, with the upper outlet 7 at the top and the lower outlet 8 at the bottom. During drip irrigation, when both outlets 7 and 8 are dispensing simultaneously, to prevent the liquid from the upper outlet 7 from being blocked by the lower outlet 8, the length of the upper outlet 7 is not less than the length of the lower outlet 8, thus avoiding the aforementioned defect. Alternatively, a staggered distribution method can also be used to avoid this defect.

[0039] The drip irrigation outlet 32 ​​is the drip irrigation liquid outlet of the present invention. Its inner side is connected to the outlet nozzle diversion chamber 31. The outlet nozzle diversion chamber 31 is connected to the top of the outer longitudinal diversion chamber 15 to realize the output of irrigation liquid. Through the connection of multiple chambers and pressure conversion, drip irrigation is implemented at the drip irrigation outlet 32 ​​position, where liquid seeps out or sprays out.

[0040] In practical operation, the control method of the low-flow drip irrigation control system of this invention is as follows:

[0041] Controller 1 controls the variable frequency booster pump 2, setting preset pressure and flow values ​​according to the crop's water requirements. It outputs the irrigation liquid transported by the main pipeline 3, which is then filtered by filter 4 and delivered to the drip irrigation main pipeline 5. The irrigation liquid enters the inner cavity of the drip irrigation main pipeline 5 through the inlet hole 17 into the inner cavity of the flow control inlet convex ball 16, and then enters the outlet pipe 20. The bottom of the outlet hole clamping sealing piece 18 and the top of the flow control box 6 clamp the outer wall of the outlet hole to prevent liquid leakage. The irrigation liquid enters the continuous... The water flow is supplied to the connecting sleeve 21 and output from the bottom of the connecting sleeve 21. During the output process, the position of the water flow sealing head 24 in the bottom cavity of the connecting sleeve 21 is adjusted by tightening or loosening the adjusting control bolt 19. When the adjusting control bolt 19 is rotated counterclockwise, the water flow sealing head 24 moves away from the connecting sleeve 21, and the water flow of the connecting sleeve 21 increases. When the adjusting control bolt 19 is rotated clockwise, the water flow sealing head 24 moves closer to the connecting sleeve 21, and the water flow of the connecting sleeve 21 decreases. The irrigation liquid enters the lower chamber after exiting from the bottom of the connecting sleeve 21.

[0042] When the variable frequency booster pump 2 controls a small irrigation liquid flow rate, the irrigation liquid is delivered from the inlet 26 in the lower chamber to the transverse diversion chamber 28 in the lower outlet 8. The transverse diversion baffle 27 diverts the liquid, which then enters the inner longitudinal diversion chamber 29. From there, it flows through the longitudinal diversion hole 14 on the longitudinal diversion baffle 30 into the outer longitudinal diversion chamber 15, and finally exits through the outlet diversion chamber 31 and the drip irrigation outlet 32. When the variable frequency booster pump 2 controls a large irrigation liquid flow rate, a portion of the irrigation liquid is delivered from the inlet 26 in the lower chamber to the transverse diversion chamber 28 in the lower outlet 8, where the transverse diversion baffle 27 diverts the liquid. The liquid is diverted and then enters the inner longitudinal diversion chamber 29. It flows into the outer longitudinal diversion chamber 15 through the longitudinal diversion hole 14 provided on the longitudinal diversion baffle 30, and finally exits through the outlet diversion chamber 31 and the drip irrigation outlet 32. At the same time, another part of the irrigation liquid enters the upper chamber through the connecting hole 23, and then is transported to the transverse diversion chamber 28 in the upper outlet 7 through the inlet 26 provided in the upper chamber. The transverse diversion baffle 27 is used to divert the liquid, and then it enters the inner longitudinal diversion chamber 29. It flows into the outer longitudinal diversion chamber 15 through the longitudinal diversion hole 14 provided on the longitudinal diversion baffle 30, and finally exits through the outlet diversion chamber 31 and the drip irrigation outlet 32.

[0043] In another embodiment of the present invention, during the drip irrigation control operation described above, by tightening the adjusting control bolts 19 at the bottom of several flow control boxes 6, the water flow sealing head 24 is fully inserted into the bottom cavity of the connecting sleeve 21, thereby sealing the bottom of the connecting sleeve 21 inside the flow control box 6 and thus shutting off the drip irrigation of the flow control box 6. By closing the same number of flow control boxes 6 at equal intervals, the density control of the flow control boxes 6 in the drip irrigation section can be achieved to meet the drip irrigation needs of different crops.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-flow drip irrigation control system, comprising a variable frequency booster pump (2) connected to a main pipeline (3), a controller (1) connected to the variable frequency booster pump (2), a filter (4) connected to the outlet end of the variable frequency booster pump (2), and a drip irrigation main pipeline (5) connected to the filter (4), characterized in that: The drip irrigation main pipe (5) has several outlet holes evenly distributed on it. An outlet pipe (20) is installed in each outlet hole. An outlet hole clamping and sealing piece (18) is fixedly installed on the outer wall of the end of the outlet pipe (20) located in the drip irrigation main pipe (5). A flow control inlet ball (16) with an inlet hole (17) is fixedly installed above the outlet hole clamping and sealing piece (18). A flow control box (6) is set outside the drip irrigation main pipe (5). A connecting sleeve (21) is installed at the center of the inner cavity of the flow control box (6). The connecting sleeve (21) is fitted outside the outlet pipe (20). The drip irrigation main pipe (5) around the outlet hole is... The outer wall is clamped between the outlet hole clamping and sealing piece (18) and the flow control box (6). A small flow control device is installed inside and outside the flow control box (6). The small flow control device includes a flow control partition (22) arranged horizontally in the middle of the flow control box (6). The flow control partition (22) divides the flow control box (6) into upper and lower chambers. The upper and lower chambers are connected by a connecting hole (23) provided on the flow control partition (22). The bottom of the connecting sleeve (21) is connected to the lower chamber. A sealing nut sleeve (10) is fitted at the center of the bottom plate of the flow control box (6). 10) An adjusting control bolt (19) is installed inside. A flow rate sealing head (24) that matches the inner diameter of the connecting sleeve (21) is installed in the lower chamber. The top of the adjusting control bolt (19) is connected to the flow rate sealing head (24). The outer walls of the flow control boxes (6) corresponding to the upper and lower chambers are respectively provided with an upper liquid outlet (7) and a lower liquid outlet (8). The inner ends of the upper liquid outlet (7) and the lower liquid outlet (8) are connected to the upper and lower chambers respectively through the liquid inlet (26). A transverse diversion baffle (27) is provided in both the upper liquid outlet (7) and the lower liquid outlet (8). The two adjacent transverse diversion baffles are connected to the upper and lower chambers respectively. A transverse diversion cavity (28) connected to the inlet (26) is provided in front of the flow baffle (27). The other end of the transverse diversion cavity (28) is connected to the inner longitudinal diversion cavity (29). A longitudinal diversion baffle (30) is provided outside the inner longitudinal diversion cavity (29). A longitudinal diversion hole (14) is provided on the longitudinal diversion baffle (30). An outer longitudinal diversion cavity (15) is provided outside the longitudinal diversion baffle (30). The outer longitudinal diversion cavity (15) is connected to the inner longitudinal diversion cavity (29) through the longitudinal diversion hole (14). A liquid outlet (12) is provided on both the upper liquid outlet (7) and the lower liquid outlet (8).

2. The low-flow drip irrigation control system of claim 1, wherein: The outlet hole clamping and sealing piece (18) is a ring structure with a trapezoidal cross section. The upper diameter of the outlet hole clamping and sealing piece (18) is not greater than its lower diameter, and the lower diameter of the outlet hole clamping and sealing piece (18) is not less than the diameter of the outlet hole. The flow control inlet convex ball (16) is a hollow hemispherical structure. The diameter of the flow control inlet convex ball (16) is equal to the diameter of the outlet hole. The inner cavity of the drip irrigation main pipe (5) is connected to the inner cavity of the flow control inlet convex ball (16) through the inlet hole (17). The inner cavity of the flow control inlet convex ball (16) is connected to the inner cavity of the outlet pipe (20).

3. The low-flow drip irrigation control system of claim 2, wherein: The outer diameter of the outlet pipe (20) matches the inner diameter of the connecting sleeve (21). The outlet pipe (20) and the connecting sleeve (21) are connected by threads or fastening. The length of the outlet pipe (20) is not greater than the length of the connecting sleeve (21).

4. The low-flow drip irrigation control system of claim 3, wherein: The connecting sleeve (21) is longitudinally fixed at the top center of the flow control box (6). The top of the connecting sleeve (21) is an open structure that communicates with the outside. The flow control box (6) is a square or cylindrical cavity structure. A soil insertion support rod (9) is provided at the bottom of the flow control box (6).

5. The low-flow drip irrigation control system of claim 4, wherein: The connecting sleeve (21) is fitted at the center of the flow control baffle (22). The bottom outlet of the connecting sleeve (21) is located in the longitudinal middle of the lower chamber. The bottom of the water flow sealing head (24) is connected to the top of the adjusting control bolt (19) through the sealing connecting piece (25). The sum of the heights of the water flow sealing head (24) and the sealing connecting piece (25) is not greater than half the depth of the lower chamber. The water flow sealing head (24) is a conical truncated structure with a smaller top and a larger bottom. The bottom diameter of the water flow sealing head (24) is not less than the inner diameter of the connecting sleeve (21).

6. The low-flow drip irrigation control system of claim 5, wherein: The length of the upper liquid outlet (7) is not less than the length of the lower liquid outlet (8). Both the upper liquid outlet (7) and the lower liquid outlet (8) are directional box structures. The upper liquid outlet (7) and the lower liquid outlet (8) are staggered or correspondingly distributed on the outer wall of the flow control box (6).

7. The low-flow drip irrigation control system of claim 6, wherein: The nozzle (12) is provided with a nozzle diversion cavity (31) that is connected to the outer longitudinal diversion cavity (15). The nozzle (12) is provided with a nozzle baffle (13) on its outer wall. The nozzle baffle (13) is provided with a drip irrigation outlet hole (32) that is connected to the nozzle diversion cavity (31).

8. A control method of the low-flow drip irrigation control system as claimed in claim 7, characterized in that, The method is as follows: The controller (1) controls the variable frequency booster pump (2), sets the preset pressure and flow rate according to the crop's water requirements, and outputs the irrigation liquid transported by the main pipeline (3). After being filtered by the filter (4), the liquid is transported to the drip irrigation main pipeline (5). The irrigation liquid enters the inner cavity of the flow control inlet ball (16) through the inlet hole (17) from the inner cavity of the drip irrigation main pipeline (5), and then enters the outlet pipe (20) through the inner cavity of the flow control inlet ball (16). The bottom of the outlet hole clamping and sealing piece (18) and the top of the flow control box (6) clamp the outer wall of the outlet hole to prevent liquid leakage. The irrigation liquid enters the connecting sleeve from the bottom of the outlet pipe (20). The water flow is discharged from the bottom of the connecting sleeve (21) and the water flow is discharged from the bottom of the connecting sleeve (21). During the discharge process, the water flow sealing head (24) is adjusted up and down in the inner cavity of the bottom of the connecting sleeve (21) by adjusting the tightness of the adjusting control bolt (19). When the adjusting control bolt (19) is rotated counterclockwise, the water flow sealing head (24) moves away from the connecting sleeve (21) and the water flow of the connecting sleeve (21) increases. When the adjusting control bolt (19) is rotated clockwise, the water flow sealing head (24) moves closer to the connecting sleeve (21) and the water flow of the connecting sleeve (21) decreases. The irrigation liquid enters the lower chamber after being discharged from the bottom of the connecting sleeve (21). When the variable frequency booster pump (2) controls the output irrigation liquid flow rate to be small, the irrigation liquid is transported from the inlet (26) in the lower chamber to the transverse diversion chamber (28) in the lower outlet (8). The transverse diversion baffle (27) diverts the liquid, which then enters the inner longitudinal diversion chamber (29) and flows into the outer longitudinal diversion chamber (15) through the longitudinal diversion hole (14) on the longitudinal diversion baffle (30). Finally, it is output through the outlet diversion chamber (31) and the drip irrigation outlet (32). When the variable frequency booster pump (2) controls the output irrigation liquid flow rate to be large, a portion of the irrigation liquid is transported from the inlet (26) in the lower chamber to the transverse diversion chamber (28) in the lower outlet (8). The transverse diversion baffle (27) diverts the liquid. The liquid flows into the inner longitudinal diversion chamber (29), then flows into the outer longitudinal diversion chamber (15) through the longitudinal diversion hole (14) provided on the longitudinal diversion baffle (30), and finally outputs through the outlet diversion chamber (31) and the drip irrigation outlet hole (32). At the same time, another part of the irrigation liquid enters the upper chamber through the connecting hole (23), and then is transported to the transverse diversion chamber (28) in the upper outlet device (7) through the inlet (26) provided in the upper chamber. The transverse diversion baffle (27) is used to divert the liquid, and then it enters the inner longitudinal diversion chamber (29), flows into the outer longitudinal diversion chamber (15) through the longitudinal diversion hole (14) provided on the longitudinal diversion baffle (30), and finally outputs through the outlet diversion chamber (31) and the drip irrigation outlet hole (32).

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