An aeration oxygenation irrigation device

Abstract

The present application relates to the field of agricultural irrigation technology, and discloses an aeration oxygenation irrigation device, which comprises a box body, the inner bottom wall of the box body is fixedly connected with a water outlet pipeline, the water inlet end of the water outlet pipeline is fixedly connected with a connecting pipe, the top end of the connecting pipe is provided with an aeration water storage tank, and the shape of the aeration water storage tank is contracted in the form of steps from top to bottom. The present application has the following advantages and effects: through tangential air inlet, spiral mixing, step-shaped contraction, mechanical crushing, cyclic re-aeration and nutrient solution pre-oxygenation, a multi-stage series oxygenation link is constructed, each stage further improves the oxygen dissolving capacity of the nutrient solution in the dilution process on the basis of the previous stage, spiral internal circulation oxygenation with multiple stages, multiple levels and air-water coupling is formed, the dissolved oxygen is greatly and stably improved in the process of nutrient solution dilution, and the present application is suitable for oxygen supply for the root layer of melon fruit during the swelling period when the concentration of the nutrient solution is high.

Description

Technical Field

[0001] This invention relates to the field of agricultural irrigation technology, and in particular to an aeration and oxygenation irrigation device. Background Technology

[0002] During the flowering, fruiting, and fruit enlargement stages of melons, they require a large amount of nutrients. At this time, the EC value of the nutrient solution needs to be adjusted to its highest level (2.0-2.8 mS / cm), meaning the nutrient solution should be more concentrated. During this period, the oxygen consumption of the melon roots also reaches its peak. Data shows that during the fruit enlargement stage, the oxygen consumption per plant per hour can reach as high as 40 mg, more than three times higher than during the flowering stage. If only fertilizer is added (increasing the concentration) while neglecting oxygenation, the roots will quickly "suffocate" due to lack of oxygen, resulting in absorption problems, and the fruit will not be able to enlarge normally.

[0003] During the aforementioned stages of melon growth, traditional methods for oxygenating melon nutrient solutions primarily rely on air compressors to inject air into the nutrient solution, combined with agitation devices or aeration discs combined with Venturi jets to create oxygen-rich microbubbles, thereby alleviating oxygen deficiency during nutrient solution dilution. Specifically, both methods passively oxygenate the nutrient solution by simply increasing the gas-liquid contact area and time. However, these methods have significant drawbacks: agitation relies mainly on gas-liquid mixing, which easily generates large bubbles, resulting in limited improvement in dissolved oxygen saturation and low oxygen transfer efficiency. While Venturi jets can generate microbubbles, their entrainment ratio is typically only 0.5-1.5, meaning that each unit of water flow can only carry in a small amount of air. Therefore, both methods suffer from low actual oxygen dissolution efficiency during nutrient solution dilution. Thus, an aeration and oxygenation irrigation device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide an aeration and oxygenation irrigation device that can stably and continuously improve the dissolved oxygen capacity during the dilution of nutrient solution, thereby achieving a significant and stable increase in dissolved oxygen during the dilution process.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an aeration and oxygenation irrigation device, comprising a box body, an outlet pipe fixedly connected to the inner bottom wall of the box body, a connecting pipe fixedly connected to the inlet end of the outlet pipe, an aeration water storage tank provided at the top end of the connecting pipe, the aeration water storage tank having a stepped shape that tapers from top to bottom, and multiple baffle rods fixedly connected to the inner side wall of the aeration water storage tank, and a nutrient solution storage mechanism provided at the top end of the aeration water storage tank, the box body... An air pump is fixedly connected to the top of the container, and an air supply pipe is fixedly connected to the air outlet of the air pump. The air supply pipe extends into the interior of the container, and multiple air distribution pipes are fixedly connected to the side wall of the air supply pipe. All of the multiple air distribution pipes are connected tangentially into the interior of the aeration water storage tank. An air nozzle is fixedly installed at the air outlet of each air distribution pipe. A water inlet pipe is provided inside the container, and the water inlet of the water inlet pipe is connected to a water source. Multiple water distribution pipes are fixedly connected to its side wall, and the multiple water distribution pipes are also connected tangentially into the interior of the aeration water storage tank.

[0006] By adopting the above technical solution, the air pump tangentially introduces airflow into the aeration storage tank through the air delivery pipe and the air distribution pipe. The airflow is released through the nozzle, achieving air-based oxygenation. The water inlet pipe tangentially enters the aeration storage tank through the water distribution pipe, forcing the water and airflow to rotate. This creates a spiral mixing circulation within the aeration storage tank. The tangential entry of air and water generates centrifugal rotation, extending the air-liquid path and contact time, thus improving dissolved oxygen capacity. The oxygenation efficiency is far higher than that of direct-flow aeration. The dual drive of gas (provided by the air pump) and water (external water source) forms an air-water mixed vortex, achieving circulating aeration and oxygenation. The combined effect of air and water, along with the stepped contraction of the aeration storage tank (wider at the top and narrower at the bottom, with faster flow velocity towards the bottom), enhances bubble breakage and mixing. The air and water flow velocities accelerate in the contraction section. Combined with the baffle rod, the bubbles are repeatedly cut and broken up more thoroughly, dispersing large bubbles and forming microbubbles, enhancing turbulence, making the bubbles smaller and more evenly distributed, and significantly increasing dissolved oxygen. At the same time, excess airflow enters the nutrient solution storage mechanism, actively increasing the oxygen content of the nutrient solution in advance. In summary, this device constructs a multi-stage series oxygenation chain through tangential air intake → spiral mixing → stepped contraction → mechanical breaking → circulating re-aeration → nutrient solution pre-oxygenation. Each stage further enhances the dissolved oxygen capacity of the nutrient solution during the dilution process based on the previous stage, forming a multi-stage, multi-layered, air-water coupled spiral internal circulation oxygenation, achieving a significant and stable increase in dissolved oxygen during the nutrient solution dilution process. It is suitable for supplying oxygen to the root layer during the fruit expansion stage of melons that require high nutrient solution concentrations.

[0007] A further feature of the present invention is that the nutrient solution storage mechanism includes a shell fixedly connected to the top of the aeration water storage tank, the shell has a liquid storage chamber inside, the top of the shell has an air hole, the bottom of the shell has a plurality of liquid discharge holes, and the bottom of the shell is provided with a valve for opening and closing the liquid discharge holes.

[0008] By adopting the above technical solution, the nutrient solution storage mechanism is directly installed at the top of the aeration tank. After the spiral mixing inside the aeration tank, all gases (including excess, undissolved air or oxygen) will rise under the action of air pressure and accumulate in the space at the top of the tank. When the valve is opened, multiple drain holes at the bottom of the shell allow the nutrient solution to drip into the aeration tank below by gravity and mix with the water inside the aeration tank. At the same time, these drain holes also become the inlets for rising airflow. Excess airflow can enter the storage chamber through these holes. The airflow entering the storage chamber will pass through the nutrient solution and be discharged from the air hole at the top. In this process, the airflow actively increases the oxygen content of the undiluted nutrient solution. The air hole at the top ensures unobstructed airflow and avoids pressure blockage without adding any extra energy, thus achieving pre-oxygenation of the nutrient solution.

[0009] A further feature of the present invention is that a stepped water collection hopper is fixedly connected to the bottom end of the aeration water storage tank, and the lower outlet of the stepped water collection hopper is connected to the top end of the connecting pipe via a flange.

[0010] By adopting the above technical solution, the mixture is collected by gravity and then connected to the connecting pipe through a flange. The stepped structure causes the fluid to contract and converge towards the center, avoiding dead water zones in the tank and ensuring that high dissolved oxygen water preferentially enters the outlet pipe. The stepped flow guide reduces turbulence dead angles, resulting in uniform and stable water output.

[0011] A further feature of the present invention is that the aeration storage tank is composed of multiple cylinders of different diameters, with the diameters of the cylinders decreasing sequentially from top to bottom in the vertical direction.

[0012] By adopting the above technical solution, multiple cylinders decrease in diameter from top to bottom, forming a stepped contraction cavity. The airflow and water flow accelerate in the circular contraction section, and the pressure decreases, which is conducive to further breaking down and refining the bubbles.

[0013] A further feature of the present invention is that a plurality of the baffle rods are fixedly distributed on the inner sidewall of the cylinder in a uniform and inclined manner, and the inclination direction of the baffle rods is consistent with the outlet direction of the gas distribution pipe.

[0014] By adopting the above technical solution, the tilt direction of the turbulence rod is consistent with the gas outlet direction of the gas distribution pipe, which is equivalent to adding guide vanes to the rotating flow field, strengthening the tangential flow component, suppressing axial short-circuit flow, and the turbulence rod 8 guides the water flow and bubbles to rotate continuously along the tangential direction. The water flow is turned 90° every time it passes through a layer, and the bubbles are repeatedly cut and broken up more thoroughly. Large bubbles are broken up to form microbubbles, which increases the gas-liquid contact area, further improves the gas-liquid mass transfer efficiency, and uniformly distributes to avoid local dead zones, thus solving the problem of "local hypoxia".

[0015] A further feature of the present invention is that the gas pipeline is provided with a gas flow control valve, which is an electromagnetic proportional valve with a control accuracy of ±0.1L / min.

[0016] By adopting the above technical solution, an electromagnetic proportional valve is installed on the gas transmission pipeline as a gas flow control valve. The valve opening is controlled by electromagnetic signals. The air intake can be precisely adjusted according to the real-time dissolved oxygen monitoring value of the water body or the oxygen demand of crops at different growth stages. Combined with the frequency conversion regulation of the circulating pump, the optimal control of the gas-water ratio can be achieved, thereby regulating the gas flow rate with a control accuracy of ±0.1L / min. This allows for precise control of the amount of air entering the system, which can be flexibly adjusted according to different irrigation and oxygenation needs, avoiding energy waste caused by insufficient or excessive gas supply, and ensuring the stability and uniformity of the oxygenation effect.

[0017] A further feature of the present invention is that a controller is fixedly installed on the outer side of the housing, and the controller is electrically connected to a gas flow control valve and a gas pump respectively.

[0018] By adopting the above technical solution, the controller is a PLC controller, model OHR-PR10, which is equipped with a touch screen display interface. The touch screen sets parameters (such as dissolved oxygen target value, intermittent aeration time), and can automatically start and stop the air pump and control the opening degree of the gas flow control valve according to the time sequence or sensor signal.

[0019] A further feature of the present invention is that the water outlet pipe is provided with a flow disturbance component for dispersing air bubbles. The flow disturbance component includes staggered guide plates and baffles. The angle between the guide plates and the horizontal plane is 30°-60°. The baffles are provided with through vent holes.

[0020] By adopting the above technical solution, the air bubbles carried by the water flow from the aeration tank are impacted by the inclined guide plate and cut by the small holes of the baffle plate when passing through the turbulence component, causing large air bubbles to break into a large number of micro bubbles. The turbulence and baffles increase the contact path and time between water and air bubbles. Breaking up the air bubbles increases the contact area between water and air, which is conducive to the further dissolution of residual oxygen and improves the oxygenation effect. Micro bubbles are less likely to merge into large air bubbles in the drip irrigation capillary tube, reducing the risk of air resistance or blockage of the irrigation device caused by air bubble aggregation and ensuring irrigation uniformity.

[0021] A further feature of the present invention is that the turbulence component is composed of 3-5 layers of guide plates and deflectors alternately, with the guide plates and deflectors of adjacent layers arranged perpendicularly to each other, and the vent holes are distributed in a honeycomb array on the deflectors.

[0022] By adopting the above technical solution, the multi-layered alternating and vertical plate structure forces the water flow to constantly change direction and be repeatedly cut, forming a strong turbulent mixing effect, which more fully disperses the bubbles. The bubble breaking efficiency is several times higher than that of a single-layer structure. The honeycomb array layout of the vent holes allows the water flow to pass through the baffle plate without dead angles, ensuring that all bubbles are subjected to shearing action. This achieves efficient turbulence and oxygenation within a shorter pipe length, further improving the oxygenation efficiency of the water body and making the dissolved oxygen more uniform and stable.

[0023] The beneficial effects of this invention are: 1. The high-pressure airflow provided by the air pump enters the aeration storage tank tangentially through the air distribution pipe. At the same time, the water inlet pipe also enters the same tank tangentially through the water distribution pipe. The tangential flow causes the gas and water to move closely against the tank wall, converting linear kinetic energy into rotational kinetic energy. This rapidly forms a high-speed rotating vortex field in the aeration storage tank, creating a multi-stage, multi-layered, air-water coupled spiral internal circulation oxygenation, thus achieving a significant and stable increase in dissolved oxygen in the nutrient solution during the dilution process.

[0024] 2. Driven by both water and air currents in a tangential direction, a spiral flow rotating in the same direction is formed inside the aeration tank. The gas and water no longer flow in layers, but instead intertwine and spiral downwards. Centrifugal force forces the heavier water to move towards the outer wall, while the lighter bubbles gather towards the center. This relative motion continuously shears the bubbles, breaking them down into micron-sized bubbles. At the same time, the spiral path is much longer than the straight path, extending the gas-liquid contact time several times, achieving circulating aeration and oxygenation. The combined action of gas and water enhances turbulence, making the bubbles smaller and more evenly distributed, significantly increasing the gas-liquid contact surface area, thereby significantly increasing the dissolved oxygen content of the nutrient solution.

[0025] 3. Excess airflow enters the nutrient solution storage mechanism, actively increasing the oxygen content in the nutrient solution and preventing oxygen deficiency due to long-term stagnation or microbial consumption, which helps maintain a good water, fertilizer and air environment around the roots; the stepped water collection hopper at the bottom accelerates the swirling flow and increases pressure to promote the dissolution of more oxygen; the stepped contraction further accelerates the swirling flow velocity, generating local negative pressure and strong turbulence, which causes the large residual bubbles to burst. Combined with the baffle rod, the bubbles are repeatedly cut and broken more thoroughly, further improving the oxygen dissolution capacity of the nutrient solution during the dilution process.

[0026] 4. The water that has undergone preliminary oxygenation is not discharged directly, but continues to rotate and circulate downwards in the aeration storage tank, repeatedly receiving impacts and shearing from newly entering air bubbles, forming a closed loop of "air intake → mixing → shearing → dissolving → remixing" until the water is pumped out. The same portion of water can undergo multiple gas-liquid contacts, achieving a significant and stable increase in dissolved oxygen during the nutrient solution dilution process. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the internal structure of the aeration storage tank of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the aeration storage tank of the present invention; Figure 4 This is a schematic diagram of the structure of the water inlet pipe of the present invention on the aeration storage tank; Figure 5 This is a schematic diagram of the nutrient solution storage mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of the turbulence-disrupting component of the present invention; Figure 7 This is a schematic diagram of the control principle of the present invention.

[0029] In the diagram, 1. Box body; 2. Connecting pipe; 3. Stepped water collection hopper; 4. Inlet pipe; 5. Distribution pipe; 6. Aeration storage tank; 7. Nutrient solution storage mechanism; 701. Shell; 702. Air hole; 703. Liquid storage chamber; 704. Liquid outlet; 705. Valve; 8. Baffle rod; 9. Air pump; 10. Air supply pipe; 11. Air distribution pipe; 12. Air nozzle; 13. Distribution pipe; 14. Irrigation branch pipe; 15. Irrigation main pipe; 16. Water pump; 17. Baffle assembly; 1701. Guide plate; 1702. Deflector plate; 1703. Vent; 18. Controller; 19. Gas flow control valve; 20. Water outlet pipe. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. 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.

[0031] Reference Figure 1-7An aeration and oxygenation irrigation device includes a housing 1. A water outlet pipe 20 is fixedly connected to the inner bottom wall of the housing 1. A connecting pipe 2 is fixedly connected to the inlet end of the water outlet pipe 20. An aeration water storage tank 6 is installed at the top of the connecting pipe 2. The aeration water storage tank 6 tapers in a stepped shape from top to bottom, and multiple baffle rods 8 are fixedly connected to the inner side wall of the aeration water storage tank 6. A nutrient solution storage mechanism 7 is installed at the top of the aeration water storage tank 6. An air pump 9 is fixedly connected to the top of the housing 1. An air supply pipe 10 is fixedly connected to the air outlet end of the air supply pipe 10, which extends into the interior of the housing 1. Multiple air distribution pipes 11 are fixedly connected to the side wall of the air supply pipe 10. All multiple air distribution pipes 11 are connected to the interior of the aeration water storage tank 6 in a tangential direction. An air nozzle 12 is fixedly installed at the air outlet end of the air distribution pipe 11. A water inlet pipe 4 is provided inside the housing 1. The water inlet end of the water inlet pipe 4 is connected to a water source. Multiple water distribution pipes 5 are fixedly connected to its side wall. The multiple water distribution pipes 5 are also connected to the interior of the aeration water storage tank 6 in a tangential direction. Air pump 9 tangentially introduces airflow into aeration storage tank 6 through air delivery pipe 10 and air distribution pipe 11, releasing the airflow through nozzle 12 to achieve air-based oxygenation. Water inlet pipe 4 tangentially enters aeration storage tank 6 through water distribution pipe 5, forcing water and airflow to rotate, forming a spiral mixing circulation within aeration storage tank 6. The tangential entry of air and water generates centrifugal rotation, extending the air-liquid path and contact time, thus improving dissolved oxygen capacity. The oxygenation efficiency is far higher than direct-flow aeration. Dual drive from gas (provided by air pump 9) and water (external water source) forms an air-water mixed vortex, achieving circulating aeration and oxygenation. The combined effect of air and water, along with the stepped contraction of aeration storage tank 6 (wider at the top and narrower at the bottom, with faster flow velocity towards the bottom), enhances bubble breakage and mixing. The airflow and water flow accelerate in the contraction section. Combined with the turbulence bar 8, the bubbles are repeatedly cut and broken more thoroughly, dispersing large bubbles and forming microbubbles, enhancing turbulence, making the bubbles smaller and more evenly distributed, and significantly increasing dissolved oxygen. At the same time, excess airflow enters the nutrient solution storage mechanism 7, actively increasing the oxygen content of the nutrient solution in advance. In summary, this device constructs a multi-stage series oxygenation chain through tangential air intake → spiral mixing → stepped contraction → mechanical breaking → circulating re-aeration → nutrient solution pre-oxygenation. Each stage further enhances the dissolved oxygen capacity of the nutrient solution during the dilution process based on the previous stage, forming a multi-stage, multi-layered, air-water coupled spiral internal circulation oxygenation, achieving a significant and stable increase in dissolved oxygen during the nutrient solution dilution process. It is suitable for supplying oxygen to the root layer during the fruit expansion period of melons that require high nutrient solution concentrations.

[0032] The nutrient solution storage mechanism 7 includes a housing 701 fixedly connected to the top of the aeration tank 6. The housing 701 has a storage chamber 703 inside, an air hole 702 at the top, and multiple drainage holes 704 at the bottom. A valve 705 for opening and closing the drainage holes 704 is provided at the bottom of the housing 701. The nutrient solution storage mechanism 7 is directly installed at the top of the aeration tank 6. Because after spiral mixing inside the aeration tank 6, all gases, including excess, undissolved air or oxygen, will rise under pressure and accumulate in the space at the top of the tank. When valve 705 is opened, multiple drainage holes 704 allow the nutrient solution to drip into the aeration storage tank 6 below by gravity, mixing with the water inside the aeration storage tank 6. At the same time, these drainage holes 704 also become inlets for rising airflow. Excess airflow can enter the storage chamber 703 through these holes. The airflow entering the storage chamber 703 passes through the nutrient solution and is discharged from the air hole 702 at the top. In this process, the airflow actively increases the oxygen content of the undiluted nutrient solution. The air hole 702 at the top ensures unobstructed airflow, avoids pressure blockage, and does not require any additional energy, thus achieving pre-oxygenation of the nutrient solution.

[0033] The bottom of the aeration storage tank 6 is fixedly connected to a stepped water collection hopper 3. The lower outlet of the stepped water collection hopper 3 is connected to the top of the connecting pipe 2 through a flange. The mixture is collected by gravity and then connected to the connecting pipe 2 through the flange. The stepped structure causes the fluid to contract and converge towards the center, avoiding dead water areas in the tank and ensuring that high dissolved oxygen water enters the outlet pipe first. The stepped flow guide reduces turbulent dead angles, resulting in uniform and stable water output.

[0034] The aeration storage tank 6 is composed of multiple cylinders of different diameters. In the vertical direction, the diameter of the cylinders decreases from top to bottom, forming a stepped contraction cavity. The airflow and water flow accelerate in the circular contraction section, and the pressure decreases, which is conducive to the further breaking and refining of bubbles.

[0035] Multiple baffle rods 8 are uniformly and obliquely distributed on the inner wall of the cylinder, and the oblique direction of the baffle rods 8 is consistent with the gas outlet direction of the gas distribution pipe 11. This is equivalent to adding guide vanes to the rotating flow field, strengthening the tangential flow component, suppressing axial short-circuit flow, and guiding the water flow and bubbles to rotate continuously along the tangential direction. The water flow is turned 90° every time it passes through a layer, and the bubbles are repeatedly cut and broken more thoroughly, breaking up large bubbles and forming microbubbles, increasing the gas-liquid contact area, further improving the gas-liquid mass transfer efficiency, and uniform distribution to avoid local dead zones and solve the problem of "local hypoxia".

[0036] The gas pipeline 10 is equipped with a gas flow control valve 19, which is an electromagnetic proportional valve with a control accuracy of ±0.1L / min. The electromagnetic proportional valve 19 on the gas pipeline 10 controls the opening of the valve through electromagnetic signals. It can accurately adjust the air intake based on the real-time dissolved oxygen monitoring value of the water body or the oxygen demand of crops at different growth stages. Combined with the frequency conversion regulation of the circulating pump, it can achieve optimal control of the gas-water ratio, thereby regulating the gas flow rate with a control accuracy of ±0.1L / min. It can accurately control the amount of air entering the system and flexibly adjust according to different irrigation and oxygenation needs, avoiding energy waste caused by insufficient or excessive gas supply, and ensuring the stability and uniformity of the oxygenation effect.

[0037] A controller 18 is fixedly installed on the outer side of the housing 1. The controller 18 is electrically connected to the gas flow control valve 19 and the air pump 9. The controller is a PLC controller, model OHR-PR10, with a touch screen display interface. The touch screen sets parameters (such as dissolved oxygen target value, intermittent aeration time). It can automatically start and stop the air pump 9 and the opening degree of the gas flow control valve 19 according to the time sequence or sensor signal.

[0038] The outlet pipe 20 is equipped with a turbulence-dispersing component 17 for breaking up air bubbles. The turbulence-dispersing component 17 includes staggered guide plates 1701 and baffles 1702. The angle between the guide plates 1701 and the horizontal plane is 30°-60°. The baffles 1702 are provided with through vent holes 1703. When the air bubbles carried by the water flow from the aeration tank pass through the turbulence-dispersing component 17, they are impacted by the inclined guide plates 1701 and cut by the small holes of the baffles 1702, causing large air bubbles to break into a large number of micro bubbles. Turbulence and baffles increase the contact path and time between water and air bubbles. Breaking up air bubbles can increase the contact area between water and air, which is conducive to the further dissolution of residual oxygen and improves the oxygenation effect. Micro bubbles are less likely to merge into large air bubbles in the irrigation branch pipe 14, reducing the risk of air resistance or blockage of the irrigation device caused by air bubble aggregation and ensuring irrigation uniformity.

[0039] The turbulence-inducing component 17 consists of 3-5 alternating layers of guide plates 1701 and baffles 1702. The guide plates 1701 and baffles 1702 in adjacent layers are arranged perpendicularly to each other. The vents 1703 are distributed in a honeycomb array on the baffles 1702. The multi-layered alternating and vertical plate structure forces the water flow to constantly change direction and be repeatedly cut, forming a strong turbulent mixing effect, which more fully disperses the bubbles. The bubble breaking efficiency is several times higher than that of a single-layer structure. The honeycomb array layout of the vents allows the water flow to pass through the baffles 1702 without dead angles, ensuring that all bubbles are subjected to shearing action. This achieves efficient turbulence and oxygenation within a shorter pipe length, further improving the oxygenation efficiency of the water body and making the dissolved oxygen more uniform and stable.

[0040] The outlet end of the water outlet pipe 20 extends outside the box 1. A water pump 16 is fixedly connected to the outlet end of the water outlet pipe 20. An irrigation pipeline is installed at the outlet end of the water pump 16. The irrigation pipeline includes an irrigation main pipe 15 fixedly connected to the outlet end of the water pump 16. A branch pipe 13 is fixedly connected to the outlet end of the irrigation main pipe 15. Multiple irrigation branch pipes 14 are fixedly connected to the side wall of the branch pipe 13. Multiple drip irrigation heads are evenly spaced on the irrigation branch pipes 14. The aerated water is drawn from below the aeration storage tank 6 by the water pump 16. Under the action of the water pump 16, the water pump 16 delivers the highly dissolved oxygen water to the irrigation pipeline. The water is then transported to the irrigation branch pipes 14 through the branch pipes 13. Finally, the water is delivered to the melon planting area in the form of drip irrigation through the irrigation branch pipes 14, realizing drip irrigation under film for melon planting, reducing water evaporation and loss, improving water resource utilization efficiency, and avoiding problems such as poor root respiration caused by excessive soil moisture.

[0041] Pump 16 is a variable frequency pump with a flow rate of 1-5 m³ / h and a head of 5-20 m. Its operating frequency can be adjusted according to actual needs, thereby changing the flow rate and head. The flow rate of 1-5 m³ / h and the head of 5-20 m can meet the needs of different irrigation scenarios and oxygenation requirements, so that dissolved oxygen is uniform and stable under different irrigation scenarios. The variable frequency design can be flexibly adjusted according to actual conditions, improving the adaptability of the device and energy utilization efficiency.

[0042] The controller 18 can also be electrically connected to the water pump 16 via a wire, and the controller 18 can control the start and stop of the water pump 16 as needed.

[0043] In this invention, 1. The high-pressure airflow provided by the air pump 9 enters the aeration storage tank 6 tangentially through the air distribution pipe 11. At the same time, the water inlet pipe 4 also enters the same tank tangentially through the water distribution pipe 5. The tangential inflow causes the gas and water to move closely against the tank wall, converting linear kinetic energy into rotational kinetic energy. This rapidly forms a high-speed rotating vortex field within the aeration storage tank 6, creating a multi-stage, multi-layered, air-water coupled spiral internal circulation oxygenation, thus achieving a significant and stable increase in dissolved oxygen in the nutrient solution during the dilution process.

[0044] 2. Driven by both water and air flow in a tangential direction, a spiral flow rotating in the same direction is formed inside the aeration tank 6. The gas and water no longer flow in layers, but instead intertwine and spiral downwards. Centrifugal force forces the heavier water to move towards the outer wall, while the lighter bubbles gather towards the center. This relative motion continuously shears the bubbles, breaking them down into micron-sized bubbles. At the same time, the spiral path is much longer than the straight path, extending the gas-liquid contact time several times, achieving circulating aeration and oxygenation. The combined action of gas and water enhances turbulence, making the bubbles smaller and more evenly distributed, significantly increasing the gas-liquid contact surface area, thereby significantly increasing the dissolved oxygen content of the nutrient solution.

[0045] 3. Excess airflow enters the nutrient solution storage mechanism 7, actively increasing the oxygen content in the nutrient solution and preventing oxygen deficiency due to long-term stagnation or microbial consumption, which is conducive to maintaining a good water, fertilizer and air environment around the roots; the bottom stepped water collection hopper 3 accelerates the swirling flow and increases the pressure to promote the dissolution of more oxygen; the stepped contraction further accelerates the swirling flow speed, generating local negative pressure and strong turbulence, which causes the large residual bubbles to burst. Combined with the turbulence bar 8, the bubbles are repeatedly cut and broken more thoroughly, further improving the oxygen dissolution capacity of the nutrient solution during the dilution process.

[0046] 4. The water that has undergone preliminary oxygenation is not discharged directly, but continues to rotate and circulate downwards in the aeration storage tank 6, repeatedly receiving impacts and shearing from newly entering air bubbles, forming a closed loop of "air intake → mixing → shearing → dissolution → remixing" until the water is pumped out by the water pump 16. The same portion of water can undergo multiple gas-liquid contacts, achieving a significant and stable increase in dissolved oxygen during the nutrient solution dilution process.

Claims

1. An aeration and oxygenation irrigation device, characterized in that: The device includes a housing, with a water outlet pipe fixedly connected to the inner bottom wall of the housing. A connecting pipe is fixedly connected to the inlet end of the water outlet pipe, and an aeration storage tank is installed at the top of the connecting pipe. The aeration storage tank tapers in a stepped shape from top to bottom, and multiple baffles are fixedly connected to the inner side wall of the aeration storage tank. A nutrient solution storage mechanism is installed at the top of the housing. An air pump is fixedly connected to the top of the housing, and an air supply pipe is fixedly connected to the outlet end of the air pump. The air supply pipe extends into the housing, and multiple air distribution pipes are fixedly connected to the side wall of the air supply pipe. These multiple air distribution pipes are tangentially connected to the interior of the aeration storage tank, and air nozzles are fixedly installed at the outlet ends of the air distribution pipes. A water inlet pipe is provided inside the housing, with its inlet end connected to a water source. Multiple water distribution pipes are fixedly connected to its side wall, and these multiple water distribution pipes are also tangentially connected to the interior of the aeration storage tank.

2. The aeration and oxygenation irrigation device according to claim 1, characterized in that: The nutrient solution storage mechanism includes a shell fixedly connected to the top of the aeration storage tank. The shell has a storage chamber inside, an air hole at the top, multiple liquid discharge holes at the bottom, and a valve for opening and closing the liquid discharge holes at the bottom.

3. The aeration and oxygenation irrigation device according to claim 1, characterized in that: The bottom of the aeration storage tank is fixedly connected to a stepped water collection hopper, and the lower outlet of the stepped water collection hopper is connected to the top of the connecting pipe through a flange.

4. The aeration and oxygenation irrigation device according to claim 1, characterized in that: The aeration storage tank is composed of multiple cylinders of different diameters, with the diameters of the cylinders decreasing sequentially from top to bottom in the vertical direction.

5. The aeration and oxygenation irrigation device according to claim 4, characterized in that: Multiple baffle rods are fixedly distributed on the inner wall of the cylinder in a uniform and inclined manner, and the inclination direction of the baffle rods is consistent with the outlet direction of the air distribution pipe.

6. The aeration and oxygenation irrigation device according to claim 1, characterized in that: The gas distribution pipe is equipped with a gas flow control valve, which is an electromagnetic proportional valve with a control accuracy of ±0.1L / min.

7. The aeration and oxygenation irrigation device according to claim 6, characterized in that: A controller is fixedly installed on the outer side of the housing, and the controller is electrically connected to the gas flow control valve and the gas pump respectively.

8. The aeration and oxygenation irrigation device according to claim 1, characterized in that: The water outlet pipe is equipped with a flow disturbance component for dispersing air bubbles. The flow disturbance component includes staggered guide plates and baffles. The angle between the guide plates and the horizontal plane is 30°-60°. The baffles are provided with through vent holes.

9. An aeration and oxygenation irrigation device according to claim 8, characterized in that: The turbulence-disrupting component consists of 3-5 alternating layers of guide plates and deflectors, with the guide plates and deflectors of adjacent layers arranged perpendicularly to each other, and the vents distributed in a honeycomb array on the deflectors.

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