Agricultural water conservancy water-saving irrigation equipment

Abstract

This invention discloses a water-saving irrigation device for farmland, relating to the field of agricultural water conservancy technology. It aims to solve the problem of existing equipment with fixed pipe and sprinkler diameters, which are prone to blockage due to the accumulation of silt, weeds, and debris. The device consists of a main pipeline structure and a sprinkler irrigation structure. The main irrigation pipe of the main pipeline structure is equipped with a guide pipe, a variable stiffness cylindrical compression spring, a diversion channel, and a coaxial flexible sleeve. The sprinkler irrigation structure's sprinkler pipe is equipped with a coaxially expandable telescopic core tube, a piston tube with a pressure relief nozzle, and a linked hydraulic drive assembly. This invention utilizes changes in irrigation water pressure to drive hydraulic oil circulation, enabling the flexible sleeve to dynamically adjust the water delivery diameter of the main pipeline. Simultaneously, the telescopic core tube changes the sprinkler irrigation diameter, and the piston tube controls the switching between single-nozzle fine-precision sprinkler irrigation and dual-channel high-flow sprinkler irrigation modes. No manual intervention is required throughout the process, fundamentally reducing the probability of blockage by debris, while maintaining effective water delivery pressure when the water pressure is low.

Description

Technical Field

[0001] This invention relates to the field of agricultural water conservancy technology, specifically to a water-saving irrigation device for farmland. Background Technology

[0002] Agriculture, as a major water user, accounts for more than 60% of the total water consumption in society. Traditional farmland mostly uses flood irrigation, which results in serious water waste and low irrigation efficiency. At the same time, water shortage has become a key factor restricting stable and increased grain production and sustainable agricultural development. With the continuous implementation of national policies such as the construction of high-standard farmland and water-saving society, the process of agricultural modernization and large-scale planting is accelerating. The traditional extensive irrigation model is no longer suitable for the needs of modern agricultural development. There is an urgent need to rely on professional farmland water conservancy and water-saving irrigation equipment to replace traditional irrigation methods, thereby improving water resource utilization, saving agricultural water costs, improving farmland irrigation conditions, ensuring regional water security and food security, and providing basic support for the development of smart agriculture and ecological agriculture. Driven by both industry demand and policy support, farmland water conservancy and water-saving irrigation equipment has been rapidly developed and promoted.

[0003] However, the water delivery pipes and sprinkler heads of existing conventional farmland water-saving irrigation equipment have fixed internal pipe diameters. When the irrigation water is mixed with mud, weeds, debris, or other impurities, or when the sand content and impurity concentration in the water increases, the debris is very likely to accumulate and get stuck in the sprinkler head flow channel and narrow pipe diameter, which will frequently cause problems such as sprinkler head blockage, poor water flow, or even flow interruption. This not only increases the frequency of equipment failure and the cost of manual cleaning and maintenance, but also causes uneven irrigation water supply, local farmland water shortage, seriously reduces the overall irrigation operation efficiency, and affects the normal growth of crops.

[0004] Therefore, a water-saving irrigation device for farmland is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a water-saving irrigation device for farmland, so as to solve the problem mentioned in the background art that the internal diameter of the pipe in the water-saving irrigation device for farmland cannot be adjusted.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a water-saving irrigation device for farmland, comprising:

[0007] Farmland irrigation equipment consists of a water source connection component, a pumping and pressurizing unit, a main pipeline structure, a sprinkler irrigation structure, and a control device.

[0008] The main pipeline structure includes a main irrigation pipe;

[0009] The main irrigation pipe has a limiting seat integrally installed at one end near the pumping and pressurizing unit. One side of the limiting seat is elastically connected to the piston head of the guide pipe through a variable stiffness cylindrical compression spring. In the space where the variable stiffness cylindrical compression spring is located, multiple diversion channels that bypass the limiting seat are arranged in an array along the axis towards the pipe wall near the limiting seat. Soft sleeves are fixed coaxially at both ends of the main irrigation pipe from the side of the limiting seat away from the pumping and pressurizing unit to the end of the main irrigation pipe.

[0010] The sprinkler structure includes a sprinkler pipe. Multiple hydraulic pipes are bolted to the outer wall of the sprinkler pipe from top to bottom. Each hydraulic pipe is elastically connected to a tension piston rod that moves along the pipe wall at one end near the shaft via a first spring. The end of the tension piston rod is inserted into the sprinkler pipe through a hydraulic pipe and rigidly connected to a portion of the telescopic core tube. A piston tube is slidably arranged above the telescopic core tube inside the sprinkler pipe. The piston end of the piston tube is elastically connected to the sprinkler pipe via a second spring. The piston tube has a stepped sprinkler orifice at its shaft center. A sprinkler head, communicating with the sprinkler orifice, is threaded through the upper end of the piston tube that slides out of the sprinkler pipe. Multiple open pressure relief nozzles are located on the side of the piston tube below the sprinkler head.

[0011] Preferably, the end of the main irrigation pipe closest to the water source is equipped with a pumping and pressurizing unit by bolts or wire, and is connected to the water source through a water source connection assembly. Multiple mounting seats are integrally extended along the path of the main irrigation pipe, and each mounting seat is integrally equipped with a flange connection seat that communicates with the inside of the pipe. The flange connection seat is sealed and connected to the sprinkler structure by bolts.

[0012] Preferably, the guide pipe has a through funnel-shaped waterway running through its core, wherein the flared end of the waterway points to one side of the pumping and pressurizing unit.

[0013] Preferably, the annular space between the main irrigation pipe and the guide pipe, where the variable stiffness cylindrical compression spring is located, is filled with any safe liquid such as hydraulic oil, and a sealing ring is provided on the inner wall where the limiting seat contacts the guide pipe.

[0014] Preferably, the annular gap between the flexible sleeve and the main irrigation pipe is connected to the annular space of the variable stiffness cylindrical compression spring through the diversion channel. The surface of the flexible sleeve has an open through hole at the position corresponding to the mounting base, and the through hole is fixedly connected to the inner port of the mounting base by an integrated elastic telescopic tube structure. The inner wall of the main irrigation pipe is connected to the diversion channel through a loop near the limiting seat, and the loop path has a mounting hole that penetrates to the outer surface of the main irrigation pipe. A hydraulic oil delivery interface is connected to the mounting hole with a screw inside the mounting hole.

[0015] Preferably, the lower end of the irrigation pipe is connected to the flange connection seat of the mounting base by bolts, and at least two hydraulic pipes are arranged in the same plane for each group, and each group of hydraulic pipes is distributed in a ring array along the axis of the irrigation pipe.

[0016] Preferably, the number of tubes in the telescopic core tube is equal to the number of hydraulic tubes in each group, and the gaps between the telescopic core tubes are connected by high-strength folded fan-shaped, elastically reinforced connectors. Additionally, rubber bands can be optionally fitted onto the outer surface of the telescopic core tube for binding.

[0017] Preferably, the lower side of each set of hydraulic pipes is connected by a diversion hydraulic conduit near the connection between the hydraulic pipe and the irrigation pipe. The diversion hydraulic conduit consists of a ring pipe and an M-shaped pipe connecting the ring pipe. The ring pipe is sleeved on the outside of the irrigation pipe and is located below each set of hydraulic pipes. The M-shaped pipe is connected to the outer surface of the main irrigation pipe through an interface. The telescopic core tube is configured as a T-shaped tube structure with coaxial scaling capability, and the lower end of the telescopic core tube is slidably sealed inside the mounting base.

[0018] Preferably, the upper end of the telescopic core tube is fitted with a folding connector with elastic telescopic folding capability, and the folding connector is connected to the irrigation pipe by bolts.

[0019] Preferably, the orifice diameter of the pressure relief nozzle is larger than the orifice diameter of the irrigation nozzle.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention, through the linkage structure of a telescopic core tube that can be coaxially scaled and extended inside the irrigation pipe and a piston tube with a pressure relief nozzle, can automatically expand the irrigation diameter when the sand content and impurity concentration in the water increases, thereby reducing the probability of debris accumulation and blockage from the source. At the same time, it can simultaneously activate a high-flow pressure relief irrigation mode, taking into account both anti-clogging performance and the need for rapid irrigation over a large area, thereby reducing the frequency of equipment failure and the cost of manual cleaning and maintenance.

[0022] 2. This invention, through the linkage structure of the coaxial soft sleeve and guide pipe inside the main irrigation pipe, the variable stiffness cylindrical compression spring and the diversion channel, can use hydraulic oil to squeeze the soft sleeve to limit its excessive expansion when the irrigation water pressure is low, dynamically maintaining the full-diameter water delivery state and effective water delivery pressure in the pipe, avoiding problems such as insufficient sprinkler range and uneven irrigation coverage caused by insufficient water source or slight blockage at the pumping end, and ensuring the stability of basic irrigation operations. Attached Figure Description

[0023] Figure 1 This is an overall structural view of the present invention;

[0024] Figure 2 This is a cross-sectional view of the overall structure of the present invention along the axial direction;

[0025] Figure 3 This is a radial cross-sectional view of the overall structure of the present invention;

[0026] Figure 4 This is an exploded view of the overall structure of the present invention;

[0027] Figure 5 This is a cross-sectional view of the main irrigation pipe of the present invention;

[0028] Figure 6 For the present invention Figure 2 Enlarged view of point A in the middle;

[0029] Figure 7 For the present invention Figure 3 Enlarged view at point B in the middle;

[0030] Figure 8 For the present invention Figure 5 Enlarged view of point C.

[0031] In the picture:

[0032] 1. Main pipeline structure;

[0033] 11. Main irrigation pipe; 111. Mounting bracket;

[0034] 12. Flow guide tube; 121. Variable stiffness cylindrical compression spring; 122. Diverting fluid channel; 123. Limiting seat;

[0035] 13. Flexible sleeve;

[0036] 2. Sprinkler irrigation structure;

[0037] 21. Sprinkler pipe;

[0038] 22. Telescopic core tube; 221. Folding connector;

[0039] 23. Hydraulic pipe; 231. First spring; 232. Tension piston rod;

[0040] 24. Diverting hydraulic conduit; 25. Piston tube; 251. Second spring; 252. Pressure relief nozzle; 253. Sprinkler head. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 8This invention provides a technical solution for a water-saving irrigation device for farmland:

[0043] A water-saving irrigation device for farmland includes:

[0044] Farmland irrigation equipment is installed between rows of farmland to be irrigated and consists of a water source connection component, a pumping and pressurizing unit, a main pipeline structure 1, a sprinkler irrigation structure 2, and a control device.

[0045] The main pipeline structure 1 includes a main irrigation pipe 11, which is configured as a high-strength rigid pipeline. The end of the main irrigation pipe 11 near the water source is connected to a pumping and pressurizing unit by bolts or wires and is connected to the water source through a water source connection component. Multiple mounting seats 111 are integrally extended along the path of the main irrigation pipe 11 and are arranged at equal intervals along the path. The surface of each mounting seat 111 is integrally configured with a flange connection seat that communicates with the inside of the pipe and is sealed and connected to the sprinkler structure 2 by bolts through the flange connection seat.

[0046] The main irrigation pipe 11 has an integrally formed limiting seat 123 protruding annularly towards the shaft core at one end near the pumping and pressurizing unit. The annular side of the limiting seat 123 near the pumping and pressurizing unit is elastically connected to the piston head of the guide pipe 12 via a variable stiffness cylindrical compression spring 121. The guide pipe 12 has a through-type funnel-shaped water channel running along the shaft core, with the flared end of the water channel pointing towards the pumping and pressurizing unit. The annular space between the main irrigation pipe 11 and the guide pipe 12, where the variable stiffness cylindrical compression spring 121 is located, is filled with any safe liquid such as hydraulic oil. A sealing ring is provided at the inner wall in contact with the guide pipe 12. The variable stiffness cylindrical compression spring 121 has dual stiffness, and the soft stiffness stroke is greater than the hard stiffness stroke. In the space where the variable stiffness cylindrical compression spring 121 is located, near the limiting seat 123, multiple diversion channels 122 are arranged along the axis towards the pipe wall, bypassing the limiting seat 123. The inner diameter of the main irrigation pipe 11 is larger than the inner diameter of the guide pipe 12. The pipe wall of the main irrigation pipe 11 is connected to the diversion channels 122 through a loop near the limiting seat 123, and the loop path has a through-flow to the outer surface of the main irrigation pipe 11. The mounting hole is fitted with a screw inside the mounting hole to connect to an interface for conveying hydraulic oil. When the pumping and pressurizing unit pumps water to the guide pipe 12, it pushes the guide pipe 12, causing it to compress the variable stiffness cylindrical compression spring 121 and move it along the wall of the main irrigation pipe 11 away from the pumping and pressurizing unit. As the guide pipe 12 moves, the hydraulic oil between the guide pipe 12 and the variable stiffness cylindrical compression spring 121 enters the space between the main irrigation pipe 11 and the flexible sleeve 13 through the diversion channel 122. If the water pressure is high, the pressure of the water flow after entering the flexible sleeve 13 from the guide pipe 12 will cause... The flexible sleeve 13 expands outward, squeezing the hydraulic oil between the main irrigation pipe 11 and the flexible sleeve 13 backflow. Under the dual action of water pressure, the hydraulic oil will enter the interior of the sprinkler structure 2 through the diversion channel 122. If the water pressure is normal or low, the pressure of the hydraulic oil entering the hydraulic pipe 23 is insufficient to push the pull piston rod 232 to compress the first spring 231 and drag the telescopic core tube 22 to move. The hydraulic oil will remain between the main irrigation pipe 11 and the flexible sleeve 13. Under the action of water pressure and hydraulic oil, the flexible sleeve 13 will always maintain an expanded state, avoiding the situation of insufficient water pressure during irrigation and unsatisfactory sprinkler irrigation.

[0047] The sprinkler structure 2 includes a sprinkler pipe 21. The lower end of the sprinkler pipe 21 is connected to the flange connection seat of the mounting base 111 by bolts. Multiple sets of hydraulic pipes 23 are bolted from top to bottom to the outer wall of the sprinkler pipe 21. At least two hydraulic pipes 23 are arranged in the same plane in each set, and each set of hydraulic pipes 23 is arranged in a ring array along the axis of the sprinkler pipe 21. These hydraulic pipes 23 are elastically connected to a tension piston rod 232 that moves along the pipe wall at one end near the axis by a first spring 231. The rod end of the tension piston rod 232 is inserted into the interior of the sprinkler pipe 21 through the hydraulic pipe 23 and rigidly connected to a part of the body of the telescopic core tube 22. The number of telescopic core tubes 22 is equal to the number of each set of hydraulic tubes 23. The gaps between the telescopic core tubes 22 are connected by high-strength folded fan-shaped, elastically reinforced connectors. Optionally, rubber bands are fitted onto the outer surface of the telescopic core tubes 22 for binding. The lower side of each set of hydraulic tubes 23, near the connection between the hydraulic tube 23 and the irrigation pipe 21, is connected by a diversion hydraulic conduit 24. The diversion hydraulic conduit 24 consists of a ring pipe and an M-shaped pipe connecting the ring pipe. The ring pipe is fitted outside the irrigation pipe 21 and located below each set of hydraulic tubes 23. The M-shaped pipe connects to the outer surface of the main irrigation pipe 11 through an interface. The hydraulic pipe 23 is connected to the space where the variable stiffness cylindrical compression spring 121 is located. The telescopic core tube 22 is configured as a T-shaped tube structure with coaxial scaling capability. The lower end of the telescopic core tube 22 is slidably sealed inside the mounting base 111. A piston tube 25 is slidably arranged above the telescopic core tube 22 inside the irrigation pipe 21. A folding connector 221 with elastic telescopic folding capability is sleeved and fixed at the upper end of the telescopic core tube 22. The folding connector 221 is connected to the irrigation pipe 21 by bolts (the outer edge of the folding connector 221 is connected to the irrigation pipe 21 by bolts, and its inner edge is sleeved and fixed at the upper end of the telescopic core tube 22). (Set as fixed), thereby sealing the upper end of the telescopic core tube 22 in conjunction with the folding connector 221. The piston end of the piston tube 25 is elastically connected to the irrigation pipe 21 by the second spring 251. The piston tube 25 has a stepped irrigation orifice at its axis. The upper end of the piston tube 25, which slides through the irrigation pipe 21, is threadedly connected to an irrigation nozzle 253 that communicates with the irrigation orifice. The side of the piston tube 25 has multiple open pressure relief nozzles 252 on the lower side of the irrigation nozzle 253. The diameter of the pressure relief nozzles 252 is larger than the diameter of the irrigation nozzle 253. The pressure relief nozzles 252 can be used for irrigation operations by using a suitable large-diameter nozzle.

[0048] When the pumped water volume increases sharply or the concentration of sand and impurities in the water increases significantly, the thrust of the water flow on the guide pipe 12 increases significantly, pushing the guide pipe 12 to move backward under secondary compression of the variable stiffness cylindrical compression spring 121. The high-pressure water flow causes the flexible sleeve 13 to expand further outward, squeezing the hydraulic oil between the main irrigation pipe 11 and the flexible sleeve 13. Under the dual action of the hydraulic thrust of the guide pipe movement and the squeezing force of the flexible sleeve expansion, the hydraulic oil enters each hydraulic pipe 23 through the diversion hydraulic conduit 24. The hydraulic oil pressure overcomes the first spring... 231 elastic force drives the pulling piston rod 232 to move outward. The telescopic core tube 22 is a T-shaped structure that can be coaxially scaled. The pipe sections are connected by elastic folding connectors. Under the external force, the pipe sections are relatively displaced and the overall pipe diameter is expanded, increasing the water passage cross section and preventing the accumulation and blockage of mud and sand. At the same time, the high-pressure water flow pushes the piston tube 25 to compress the second spring 251 and slide it upward. The pressure relief nozzle 252 is exposed, and the water flow is synchronously discharged from the sprinkler head 253 and the pressure relief nozzle 252 in a large flow rate to meet the needs of large-area rapid irrigation.

[0049] In summary, by linking the telescopic core tube 22, which can be coaxially scaled within the irrigation pipe 21, with the piston tube 25 with the pressure relief nozzle 252, the irrigation diameter can be automatically expanded when the sand content and impurity concentration in the water increase, thereby reducing the probability of debris accumulation and blockage from the source. At the same time, a high-flow pressure relief irrigation mode is activated simultaneously, taking into account both anti-clogging performance and the need for rapid irrigation over a large area, thus reducing the frequency of equipment failures and the cost of manual cleaning and maintenance.

[0050] As one embodiment of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, a flexible sleeve 13 is fixed coaxially at both ends of the main irrigation pipe 11 from the side of the limiting seat 123 away from the pumping and pressurizing unit to the end of the main irrigation pipe 11. The annular gap between the flexible sleeve 13 and the main irrigation pipe 11 is connected to the annular space of the variable stiffness cylindrical compression spring 121 through the diversion channel 122. The flexible sleeve 13 is preferably a high-strength pipe structure with waterproof, wear-resistant and anti-aging properties. The surface of the flexible sleeve 13 has an open through hole at the position corresponding to the mounting seat 111. The through hole position is fixedly connected to the inner port of the mounting seat 111 by an integrated elastic telescopic tube structure.

[0051] During operation, the pumping and pressurizing unit pressurizes the water source and pumps it into the main irrigation pipe 11. During normal water flow or when low to medium pressure water flow is formed due to insufficient water supply or blockage at the pumping end, the water flow first impacts the flared end of the guide pipe 12, pushing the guide pipe 12 to compress the variable stiffness cylindrical compression spring 121 backward. This compresses the hydraulic oil within the spring's annular space. Most of the hydraulic oil enters the annular gap between the main irrigation pipe 11 and the flexible sleeve 13 through the diversion channel 122, occupying the expansion space of the flexible sleeve 13 after water enters. After the water flows into the flexible sleeve 13, under the combined action of the hydraulic oil and the water flow... The main irrigation pipe 11 maintains full-diameter water delivery, dynamically adjusts the actual water delivery diameter, and relies on the expansion of the flexible sleeve 13 to compensate for low water pressure, maintaining effective water delivery pressure inside the pipe and ensuring basic sprinkler irrigation effect. The remaining hydraulic oil is synchronously sent to the hydraulic pipe 23 of each sprinkler structure 2 through the pipeline. At this time, the oil pressure is insufficient to overcome the pre-tightening force of the first spring 231, the telescopic core tube 22 maintains the minimum diameter, and the water flow only drives the piston tube 25 to move slightly upward. The pressure relief nozzle 252 remains closed, and all water flow is atomized and sprayed out in small flow by the sprinkler head 253, which is suitable for fine sprinkler irrigation of seedling crops and saves water.

[0052] In summary, by linking the coaxial flexible sleeve 13 inside the main irrigation pipe 11 with the guide pipe 12, the variable stiffness cylindrical compression spring 121, and the diversion channel 122, when the irrigation water pressure is low, the hydraulic oil can be used to squeeze the flexible sleeve 13 to limit its excessive expansion, dynamically maintaining the full-diameter water delivery state and effective water delivery pressure inside the pipe. This avoids problems such as insufficient sprinkler range and uneven irrigation coverage caused by insufficient water source or slight blockage at the pumping end, ensuring the stability of basic irrigation operations.

[0053] Working principle: The system is initially in standby mode, the pumping and pressurizing unit is not activated, and the overall environment is at normal pressure. The variable stiffness cylindrical compression spring 121 is naturally extended, and the piston head of the guide pipe 12 is in close contact with the front end face of the limiting seat 123. Hydraulic oil (water or other safe liquids can also be selected) is evenly distributed in the annular space where the variable stiffness cylindrical compression spring 121 is located, the diversion channel 122, the annular gap between the main irrigation pipe 11 and the flexible sleeve 13, and the hydraulic pipes 23 of each sprinkler structure 2. At this time, the flexible sleeve 13 is in its original contracted and flattened state, and the telescopic core tube 22 is in its maximum position under the tension of the first spring 231. With a small contraction diameter, the piston tube 25 is at its lowest position under the elastic force of the second spring 251, and the pressure relief nozzle 252 is completely blocked by the inner wall of the irrigation pipe 21. Only the irrigation orifice of the irrigation nozzle 253 is connected to the interior, and all seals are in the initial sealing state. During operation, the pumping and pressurizing unit pressurizes the water source and pumps it into the main irrigation pipe 11. If the water flow is normal or the water source is insufficient, or the pumping end is blocked by debris, resulting in a medium or low pressure water flow, the water flow first impacts the flared end of the guide pipe 12, pushing the guide pipe 12 to compress the variable stiffness cylindrical compression spring 121 in a one-stage compression phase. As the pump moves away from the pressurizing unit, the hydraulic oil in the annular space where the variable stiffness cylindrical compression spring 121 is located is squeezed. Most of the hydraulic oil flows into the annular gap between the main irrigation pipe 11 and the flexible sleeve 13 through the diversion channel 122. The compressed water flows into the expandable space after entering the flexible sleeve 13. After the water flows into the interior of the flexible sleeve 13 through the guide pipe 12, under the superposition of the hydraulic oil and water flow between the main irrigation pipe 11 and the flexible sleeve 13, the interior of the main irrigation pipe 11 will still be in a full-diameter water flow irrigation state, thereby dynamically adjusting the actual water delivery diameter inside the main irrigation pipe 11, so that the flexible sleeve... The expansion state of pipe 13 can maintain the effective water delivery pressure in the pipe when the water pressure is low, ensuring the basic sprinkler irrigation effect. Another part of the hydraulic oil is simultaneously transported to the hydraulic pipe 23 of each sprinkler structure 2 through the interface of the main irrigation pipe 11 and the branch hydraulic conduit 24. At this time, the oil pressure in the hydraulic pipe 23 is insufficient to overcome the pre-tightening force of the first spring 231. The telescopic core tube 22 maintains the minimum diameter, and the water flow pushes the piston tube 25 to move upward by a very small amount. The pressure relief nozzle 252 is still blocked. All the water flows through the sprinkler head 253 and is sprayed out in atomized small flow rate to realize the fine sprinkler irrigation of seedling crops and maximize the conservation of water resources.When the pumping volume of the water pressurization unit increases sharply or the sand content and impurity concentration of the water body increase significantly, the thrust of the water flowing through the guide pipe 12 will increase significantly, further pushing the second-stage compression variable stiffness cylindrical compression spring 121 of the guide pipe 12 to move away from the pump pressurization unit. The increased pressure of the water flow or the increased concentration will cause the flexible sleeve 13 to expand further outward, squeezing the hydraulic oil between the main irrigation pipe 11 and the flexible sleeve 13. Under the dual action of water pressure (i.e., the hydraulic thrust generated by the movement of the guide pipe 12 and the pressure generated by the expansion and squeezing of the flexible sleeve 13 supported by the water flow), the second-stage compression... Hydraulic oil enters the multiple sets of hydraulic pipes 23 on the outer wall of the irrigation pipe 21 through the diversion hydraulic conduit 24. Then, the hydraulic oil pressure overcomes the elastic force of the first spring 231 and pushes the pulling piston rod 232 to move outward of the irrigation pipe 21. Since the telescopic core tube 22 is a T-shaped tube structure with coaxial scaling capability, and the tube sections are connected by folded fan-shaped, elastically reinforced connectors, and the outer surface can be optionally wrapped with rubber bands, the tube sections of the telescopic core tube 22 undergo relative displacement under the drag of the pulling piston rod 232, realizing the scaling change of the overall pipe diameter, thereby changing the internal structure of the irrigation pipe 21. The increased diameter of the nozzle increases the cross-section through which water flows, effectively preventing the accumulation and blockage of debris such as mud, weeds, and other contaminants inside the pipe. Simultaneously, as water enters the irrigation pipe 21, it pushes the piston tube 25 to compress the second spring 251, causing it to slide upwards. With the increase in water pressure, the pressure relief nozzle 252 on the side of the piston tube 25 protrudes from the irrigation pipe 21, allowing for high-flow irrigation through both the irrigation nozzle 253 and the pressure relief nozzle 252, meeting the needs of large-area rapid irrigation. When the irrigation water pressure drops to a normal level, the variable stiffness cylindrical compression spring 121 returns to its initial compression state, and the flexible sleeve 13 contracts to restore its normal diameter. The first spring 231 drives the tension piston rod 232 and the telescopic core tube 22 to reset and reduce the water passage diameter. The hydraulic oil in the hydraulic pipe 23 will flow back through the diversion hydraulic conduit 24 to the space where the variable stiffness cylindrical compression spring 121 is located and between the main irrigation pipe 11 and the flexible sleeve 13. The second spring 251 pushes the piston tube 25 down to block the pressure relief nozzle 252. Fine, small-flow irrigation is carried out only through the sprinkler head 253, realizing the effect of automatically adjusting the water passage diameter and irrigation flow according to the water pressure. No manual intervention is required throughout the process, effectively solving the problems of easy clogging and unadjustable irrigation flow of traditional equipment.

[0054] It should be noted that all connection points are sealed using sealing rings or sealant; the length of the guide pipe 12 is adjusted to fit the length of the main irrigation pipe 11, the space capacity of the gap between the main irrigation pipe 11 and the flexible sleeve 13, and the sprinkler structure 2.

[0055] 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 water-saving irrigation device for farmland, comprising: The farmland irrigation equipment consists of a water source connection component, a pumping and pressurizing unit, a main pipeline structure (1), a sprinkler irrigation structure (2), and a control device; The main pipeline structure (1) includes a main irrigation pipe (11). Its features are: The main irrigation pipe (11) has a limiting seat (123) integrally arranged at one end near the pumping and pressurizing unit. One side of the limiting seat (123) is elastically connected to the piston head of the guide pipe (12) through a variable stiffness cylindrical compression spring (121). In the space where the variable stiffness cylindrical compression spring (121) is located, multiple diversion channels (122) are arranged along the axis towards the pipe wall near the limiting seat (123). A soft sleeve (13) is fixed at both ends of the main irrigation pipe (11) from the side of the limiting seat (123) away from the pumping and pressurizing unit to the end of the main irrigation pipe (11). The sprinkler structure (2) includes a sprinkler pipe (21). Multiple sets of hydraulic pipes (23) are bolted to the outer wall of the sprinkler pipe (21) from top to bottom. Each hydraulic pipe (23) is elastically connected to a tension piston rod (232) that moves along the pipe wall at one end near the shaft via a first spring (231). The rod end of the tension piston rod (232) is inserted through the hydraulic pipe (23) into the interior of the sprinkler pipe (21) and rigidly connected to a portion of the telescopic core tube (22). The interior of the sprinkler pipe (21) is... A piston tube (25) is slidably arranged above the telescopic core tube (22). The piston end of the piston tube (25) is elastically connected to the irrigation pipe (21) by a second spring (251). The piston tube (25) has a stepped irrigation orifice at its axis. The piston tube (25) slides through the upper end of the irrigation pipe (21) and is threadedly connected to an irrigation nozzle (253) that communicates with the irrigation orifice. The side of the piston tube (25) has multiple open pressure relief nozzles (252) on the lower side of the irrigation nozzle (253).

2. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The main irrigation pipe (11) has a pumping and pressurizing unit attached to one end near the water source by bolts or wires, and is connected to the water source through a water source connection assembly. Multiple mounting seats (111) are integrally extended along the path of the main irrigation pipe (11), and each mounting seat (111) has a flange connection seat that communicates with the inside of the pipe. The flange connection seat is sealed and connected to the sprinkler structure (2) by bolts.

3. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The guide pipe (12) has a through funnel-shaped waterway running through its core, with the flared end of the waterway pointing to one side of the pumping and pressurizing unit.

4. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The annular space between the main irrigation pipe (11) and the guide pipe (12) is filled with hydraulic oil or any safe liquid, and a sealing ring is provided on the inner wall where the limiting seat (123) contacts the guide pipe (12).

5. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The annular gap between the flexible sleeve (13) and the main irrigation pipe (11) is connected to the annular space of the variable stiffness cylindrical compression spring (121) through the diversion channel (122). The surface of the flexible sleeve (13) has an open through hole at the position corresponding to the mounting seat (111). The through hole is fixedly connected to the inner port of the mounting seat (111) by an integrated elastic telescopic tube structure. The inner wall of the main irrigation pipe (11) is connected to the diversion channel (122) through a loop near the limiting seat (123). The loop path has a mounting hole that penetrates to the outer surface of the main irrigation pipe (11). A hydraulic oil delivery interface is connected to the mounting hole with a screw.

6. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The lower end of the irrigation pipe (21) is connected to the flange connection seat of the mounting base (111) by bolts. At least two hydraulic pipes (23) are arranged on the same plane in each group, and each group of hydraulic pipes (23) is distributed in a ring array along the axis of the irrigation pipe (21).

7. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The number of tubes in the telescopic core tube (22) is equal to the number of each set of hydraulic tubes (23), and the gap between the telescopic core tubes (22) is connected by a high-strength folded fan-shaped, elastically reinforced connector. The outer side of the telescopic core tube (22) can optionally be fitted with a rubber band for binding.

8. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The lower side of each set of hydraulic pipes (23) is connected by a diversion hydraulic conduit (24) near the connection between the hydraulic pipe (23) and the irrigation pipe (21). The diversion hydraulic conduit (24) consists of a ring pipe and an M-shaped pipe that connects to the ring pipe. The ring pipe is sleeved on the outside of the irrigation pipe (21) and is located below each set of hydraulic pipes (23). The M-shaped pipe is connected to the interface of the outer surface of the main irrigation pipe (11) through a pipeline. The telescopic core pipe (22) is configured as a T-shaped pipe structure with coaxial scaling capability, and the lower end of the telescopic core pipe (22) is slidably sealed inside the mounting base (111).

9. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The upper end of the telescopic core tube (22) is fitted with a folding connector (221) with elastic telescopic folding capability, and the folding connector (221) is connected to the irrigation pipe (21) by bolts.

10. The farmland water-saving irrigation equipment according to claim 1, characterized in that: The diameter of the pressure relief nozzle (252) is larger than the diameter of the irrigation nozzle (253).

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