Device that uses irrigation water containing micro-nano bubbles for irrigation

Abstract

This invention provides an irrigation device using irrigation water containing micro-nano bubbles, comprising a main waterway, a first waterway, and a second waterway. The first waterway is connected to the main waterway. The second waterway includes a bubble generating unit and a gas collecting tank. One end of the bubble generating unit is connected upstream of the main waterway and the first waterway, and the bubble generating unit is configured to generate bubble water using irrigation water from the main waterway. One end of the gas collecting tank is connected to the other end of the bubble generating unit, and the other end of the gas collecting tank is connected downstream of the first waterway. The gas collecting tank is configured to remove bubbles larger than a predetermined volume from the bubble water to obtain target bubble water. The target bubble water then reacts with the irrigation water in the first waterway downstream to generate irrigation water for use in irrigation.

Description

Technical Field

[0001] This utility model relates to the field of agricultural oxygenation irrigation and fertigation technology, and in particular to a device for irrigation using irrigation water containing micro-nano bubbles. Background Technology

[0002] Nanobubble generators are used in low-water-volume scenarios such as aquaponics systems and facility agriculture irrigation. They generate nanobubble water by pre-treating irrigation water or continuously generating it in a circulating water system, thus assisting irrigation equipment in achieving oxygenated irrigation.

[0003] Nanobubbles in nano-bubble aeration, with their superior surface charge effect and extremely small particle size, can increase the solubility of gases in water by 5-8 times, maintaining dissolved oxygen levels above 15 mg / L for up to 48 hours, which is superior to traditional aeration methods. The rising speed of nanobubbles is only 1 μm / s (approximately 1 / 1000th the speed of micron-sized bubbles), extending their residence time in the crop root zone by 30 times, providing a continuous oxygen supply environment for rhizosphere microorganisms, and effectively promoting root development and nutrient absorption.

[0004] However, in the process of using nanobubble generators to assist irrigation equipment in achieving oxygenated irrigation, there are shortcomings such as uneven irrigation, low irrigation efficiency, and large footprint. The system can only handle a small flow rate. These shortcomings restrict the application of micro-nanobubble technology in integrated water and fertilizer systems in large fields. Utility Model Content

[0005] In view of this, the present invention provides an irrigation device using irrigation water containing micro-nano bubbles, comprising a main waterway, a first waterway, and a second waterway. The first waterway is connected to the main waterway. The second waterway includes a bubble generating unit and a gas collecting tank. One end of the bubble generating unit is connected upstream of the main waterway and the first waterway, and the bubble generating unit is configured to generate bubble water using irrigation water from the main waterway. One end of the gas collecting tank is connected to the other end of the bubble generating unit, and the other end of the gas collecting tank is connected downstream of the first waterway. The gas collecting tank is configured to remove bubbles larger than a predetermined volume from the bubble water to obtain target bubble water. The target bubble water is then combined with the irrigation water in the first waterway downstream to generate irrigation water for irrigation.

[0006] Optionally, the gas collecting tank includes a tank body and a water outlet pipe. The tank body forms a receiving space for containing bubble-filled water and has a first water inlet that allows the bubble-filled water to enter. The inner wall of the tank body and the surface of the bubble-filled water form a gas collecting chamber, where the bubbles to be removed float to the gas collecting chamber. The water outlet pipe extends from the lower part of the receiving space out of the tank body, and the target bubble-filled water after the bubbles to be removed flows into the first water channel through the water outlet pipe.

[0007] Optionally, the top of the tank is provided with an exhaust port that allows the air bubbles to be discharged, and an exhaust valve is provided at the exhaust port.

[0008] Optionally, the gas collection chamber is connected to a pressure relief valve.

[0009] Optionally, the main waterway includes a main inlet and a filtration device. Irrigation water enters the main waterway through the main inlet. The filtration device is configured to filter the irrigation water.

[0010] Optionally, the bubble generating unit includes a water inlet pipe and a bubble generator. The water inlet pipe is connected upstream of the main water channel and the first water channel. One end of the bubble generator is connected to the water inlet pipe to create a Venturi effect, and the other end is connected to the air collection tank. The bubble generator is configured to generate bubbly water.

[0011] Optionally, the bubble generating unit also includes an oxygenator connected to the bubble generator, the oxygenator being configured to supply oxygen to the bubble water.

[0012] Optionally, a water pump is provided between the bubble generator and the water inlet pipe.

[0013] Optionally, a pressure controller is provided between the bubble generator and the water pump, and between the gas collection tank and the first water channel.

[0014] Optionally, the pressure controller includes a back pressure valve and a constant pressure frequency converter.

[0015] According to an embodiment of this utility model, by setting a bubble generating unit in the first waterway, bubble water can be generated in the first waterway. By setting a gas collecting tank in the first waterway, the target bubble water after removing the bubbles to be discharged can be obtained. By setting the first waterway to be connected to the main waterway, the bubble generating unit to be connected to the upstream of the first waterway, and the gas collecting tank to be connected to the downstream of the first waterway, irrigation water for irrigation can be formed downstream of the first waterway, thereby realizing the integration of the device, reducing the floor space occupied, and since the irrigation water removes the bubbles to be discharged while including the bubbles, it can avoid the impact of the device operation due to the excessive size of the bubbles, thereby ensuring the uniformity and efficiency of irrigation. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 This schematic diagram illustrates the working principle of irrigation using irrigation water containing micro-nano bubbles according to an embodiment of the present invention.

[0018] Figure 2 This schematic diagram illustrates the working principle of the bubble generator according to an embodiment of the present invention.

[0019] Figure 3The schematic diagram illustrates the working principle of the gas collecting tank according to an embodiment of the present invention.

[0020] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0021] 1-Main water channel; 11-Main water inlet; 12-Filtration device; 13-Flow monitoring device; 14-Manual control valve;

[0022] 2-First waterway; 21-Main outlet;

[0023] 3-Second water channel; 31-Bubble generator; 311-Inlet pipe; 312-Bubble generator; 313-Oxygenator; 32-Gas collection tank; 321-Tank body; 322-First inlet; 323-Gas collection chamber; 324-Outlet pipe; 325-Exhaust port; 326-Exhaust valve; 327-Pressure relief valve; 33-Water pump; 34-Back pressure valve; 35-Constant pressure variable frequency controller. Detailed Implementation

[0024] The embodiments of the present invention will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, numerous specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the present invention.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0026] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0027] When using expressions such as "at least one of A, B, and C", they should generally be interpreted in accordance with the meaning that is commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B, and C, etc.).

[0028] Figure 1 The diagram illustrates the working principle of irrigation using irrigation water containing micro-nano bubbles according to an embodiment of the present invention. Figure 2 The diagram illustrates the working principle of the bubble generator according to an embodiment of the present invention. Figure 3 The schematic diagram illustrates the working principle of the gas collecting tank according to an embodiment of the present invention.

[0029] like Figures 1-3 As shown, this embodiment of the invention provides a device for irrigation using irrigation water containing micro-nano bubbles. The device includes a main waterway 1, a first waterway 2, and a second waterway 3. Further, the first waterway 2 is connected to the main waterway 1. One end of the second waterway 3 (as shown) Figure 1 The right end of the second waterway 3 (as shown) connects to the upstream of the main waterway 1 and the first waterway 2, and the other end (as shown) Figure 1 The left end of the second waterway 3 (shown) is connected to the downstream of the first waterway 2. After the irrigation water flows into the main waterway 1, it splits into two streams: one stream enters the first waterway 2, and the other stream enters the second waterway 3.

[0030] Furthermore, the second waterway 3 may include a bubble generator 31 and a gas collecting tank 32. One end of the bubble generator 31 (e.g., Figure 1 The right end of the bubble generating section 31 (as shown) is connected to the upstream of the main waterway 1 and the first waterway 2. One end of the gas collecting tank 32 (as shown) Figure 1 The right end of the gas collecting tank 32 shown) and the other end of the bubble generating unit 31 (as shown) Figure 1 The left end of the bubble generator 31 shown is connected. The other end of the gas collecting tank 32 (as shown) is connected. Figure 1 The left end of the gas collecting tank 32 (shown) is connected to the downstream of the first waterway 2. The bubble generating unit 31 is configured to generate bubble water using irrigation water from the main waterway 1. The gas collecting tank 32 is configured to remove bubbles larger than a predetermined volume from the bubble water to obtain target bubble water, i.e., the bubbles in the target bubble water are micro-nano bubbles after removing the bubbles to be removed. Finally, the target bubble water and the irrigation water in the first waterway 2 downstream generate irrigation water for irrigation, which can flow out from the main outlet 21 of the first waterway 2.

[0031] According to embodiments of this invention, micro-nano bubbles possess characteristics such as small diameter (between 1 micrometer and several hundred nanometers), large specific surface area (1000-5000 m² / m³), and slow rising speed (1 μm / s). These characteristics give micro-nano bubbles good stability and dispersibility in water. When irrigation water is mixed with micro-nano bubbles, irrigation using this water can better provide oxygen and nutrients to crops. Furthermore, the bubbles to be removed can be those with a diameter of 100 micrometers or more. These bubbles can affect the operation of the device, for example, potentially clogging pipes, nozzles, and other components, affecting the uniformity and efficiency of irrigation. By setting up a gas collection tank 32, the bubbles to be removed can be eliminated, thereby ensuring the uniformity and efficiency of irrigation.

[0032] In some illustrative embodiments, the diameter and material selection of the main waterway 1, the first waterway 2, and the second waterway 3 need to be determined based on the water flow rate, pressure, and water quality. For example, if the water flow rate and pressure are high, a metal pipe with a larger diameter and strong pressure resistance can be selected. If the water quality is corrosive, a corrosion-resistant plastic pipe, such as a PVC pipe or a PE pipe, can be used. High-density polyethylene (HDPE) pipes can also be used. HDPE pipes have advantages such as corrosion resistance, pressure resistance, and long service life, and can adapt to different water quality and environmental conditions. Of course, other suitable pipes can also be used, and no limitation is made here.

[0033] According to an embodiment of this utility model, by setting a bubble generating unit 31 in the first waterway 2, bubble water can be generated in the first waterway 2. By setting a gas collecting tank 32 in the first waterway 2, target bubble water after removing the bubbles to be discharged can be obtained. By setting the first waterway 2 to be connected to the main waterway 1, the bubble generating unit 31 to be connected to the upstream of the first waterway 2, and the gas collecting tank 32 to be connected to the downstream of the first waterway 2, irrigation water for irrigation can be formed downstream of the first waterway 2, thereby realizing the integration of the device, reducing the floor space occupied, and since the irrigation water removes the bubbles to be discharged while including the bubbles, it can avoid the impact of the device operation due to the excessive size of the bubbles, thereby ensuring the uniformity and efficiency of irrigation.

[0034] like Figure 3As shown, according to an embodiment of the present invention, the gas collecting tank 32 includes a tank body 321 and a water outlet pipe 324. The tank body 321 forms a receiving space for accommodating bubble water, which is a gas-liquid mixture. A first water inlet 322 is provided in the tank body 321 to allow the bubble water to enter. For example, the first water inlet 322 can be provided on the side surface of the tank body 321. Further, the first water inlet 322 can be provided in the upper middle part of the side surface. The inner wall of the tank body 321 and the surface of the bubble water form a gas collecting chamber 323. Further, as the bubble water enters the tank body 321 from the first water inlet 322, according to the principle of gravity settling, the less dense (i.e., larger volume) bubbles in the gas-liquid mixture will gradually float to the gas collecting chamber 323. The top of the tank 321 can be arc-shaped (such as hemispherical or ellipsoidal). This design facilitates the accumulation of air bubbles at the top, reducing gas retention in the gas-liquid mixture and enhancing the structural strength of the tank 321. The tank 321 can be roughly cylindrical, a shape that is simple to manufacture and offers high internal space utilization, providing a stable container for the bubble water. Furthermore, the outlet pipe 324 extends from the lower part of the container space out of the tank 321, allowing the target bubble water, after the air bubbles have been removed, to flow into the first water channel 2.

[0035] In some illustrative embodiments, the height and diameter of the tank 321 can be reasonably set as needed. Furthermore, the height can be 2-3 times the diameter. This size design ensures that the bubbles have sufficient rising distance and time, while also enabling the gas collecting tank 32 to operate efficiently within a limited space. Simultaneously, the first water inlet 322 can be positioned slightly below the bottom of the gas collecting chamber 323, so that after the bubble-water enters, gas and liquid can be effectively separated, allowing the bubbles to rise smoothly to the gas collecting chamber 323. In addition, the design of the water outlet pipe 324 extending from the lower part of the containing space ensures that the outflowing target bubble-water carries as few large, unseparated bubbles as possible.

[0036] In some illustrative embodiments, the tank body 321 of the gas collecting tank 32 may be made of stainless steel (e.g., 316 stainless steel), which has high strength and corrosion resistance.

[0037] like Figure 3 As shown in the embodiment of this utility model, the top of the tank 321 is provided with an exhaust port 325 to allow the air bubbles to be discharged. An exhaust valve 326 is provided at the exhaust port 325. The exhaust port 325 provides a discharge channel for the air bubbles accumulated in the gas collecting chamber 323. Specifically, the exhaust valve 326 can be opened periodically or as needed to exhaust gas, depending on the degree of gas accumulation in the gas collecting chamber 323, to avoid excessive gas accumulation affecting the separation effect. Furthermore, a sealing element can be provided between the exhaust port 325 and the exhaust valve 326. The sealing element can be made of nitrile rubber or polytetrafluoroethylene (PTFE) to ensure good sealing performance, prevent gas leakage, and be wear-resistant and aging-resistant.

[0038] In some illustrative embodiments, the exhaust port 325 is specifically constructed by creating a circular through hole at the top of the tank 321. The diameter of the hole is determined according to the size of the tank 321 and the gas discharge requirements; for example, the diameter of the exhaust port 325 can be set to 8-10 cm. The exhaust valve 326 can be a shut-off valve, etc. Specifically, the shut-off valve can be installed at the exhaust port 325 and connected via threads or flanges. The exhaust valve 326 can be a standard circular shape to ensure uniform force during gas flow and reduce resistance.

[0039] like Figure 3 As shown in the embodiment of this utility model, the gas collecting chamber 323 is connected to a pressure relief valve 327. Specifically, the pressure relief valve 327 is installed on the top of the tank 321 near the exhaust port 325. The pressure relief valve 327 is used to prevent excessive pressure inside the tank 321 (such as due to the accumulation of air bubbles to be discharged). When the pressure exceeds the set value, the pressure relief valve 327 automatically opens to release the pressure, ensuring the safe and stable operation of the gas collecting tank 32 and avoiding equipment damage or impact on the separation effect caused by abnormal pressure.

[0040] According to an embodiment of this utility model, the main waterway 1 includes a main inlet 11 and a filter device 12. Irrigation water enters the main waterway 1 through the main inlet 11. The filter device 12 is configured to filter the irrigation water. The purpose of filtration is to purify the irrigation water before it enters the first waterway 2, improving water quality by removing impurities, suspended solids, microorganisms, and some dissolved substances from the irrigation water, thus providing higher-quality irrigation water for crops. Furthermore, since the bubble generator 31 is located downstream of the filter device 12, i.e., using the filtered irrigation water to generate bubble water, the influence of the filter device 12 on the bubble water can be avoided.

[0041] In some illustrative embodiments, the filtration device 12 can specifically employ multiple sets of filtration equipment for step-by-step filtration. The initial filtration can be achieved through physical filtration methods. For example, a coarse filter screen can be used to intercept larger particles of impurities; the pore size of the filter screen can be selected based on the size of the impurities in the irrigation water, ranging from a few millimeters to tens of millimeters. Alternatively, sedimentation can be used, allowing heavier particles such as silt and sand in the water to settle naturally in a sedimentation tank. Initial filtration reduces the burden on subsequent filtration equipment.

[0042] Furthermore, according to an embodiment of this utility model, the filtration device 12 may include two sets of filtration equipment. The first set of filtration equipment mainly performs preliminary filtration, including a filter screen device, a sedimentation tank, and inlet and outlet ports. The filter screen device consists of a frame and a filter screen, which can be made of metal or high-strength plastic to ensure its durability. The size and shape of the sedimentation tank are designed according to the water volume and sedimentation time, and a sludge discharge port needs to be provided to facilitate regular cleaning of the settled sludge. The second set of filtration equipment performs more refined filtration based on the first set of filtration, and can employ technologies such as activated carbon filtration, ultrafiltration, and ion exchange. Among them, activated carbon filtration can remove organic matter, odor, color, etc. from the water; ultrafiltration can remove bacteria, viruses, and large molecular organic matter from the water; ion exchange can remove some dissolved ions in the water, such as calcium and magnesium ions, reducing water hardness. Specifically, the activated carbon filter consists of an activated carbon filter element, a filter housing, and inlet and outlet ports. The activated carbon filter element has a rich pore structure, which can effectively adsorb harmful substances in the water. Ultrafiltration equipment mainly consists of ultrafiltration membrane modules, pressure pumps, and control systems. It separates water by using pressure to drive it through the ultrafiltration membrane. Ion exchange equipment includes ion exchange resin columns and a regeneration system. Irrigation water treated by this second set of filtration equipment has its quality further improved and can be used as irrigation water to meet the growth needs of crops.

[0043] like Figure 2 As shown, according to an embodiment of the present invention, the bubble generating unit 31 includes a water inlet pipe 311 and a bubble generator 312. The bubble generator 312 is configured to generate bubbled water. The water inlet pipe 311 is connected to the upstream of the first water channel 2 and the main water channel 1. The water inlet pipe 311 can provide a stable water flow source for the entire bubble generation process to generate bubbled water. One end of the bubble generator 312 (e.g., Figure 2 The right end of the bubble generator 312 (as shown) is connected to the inlet pipe 311, forming a Venturi effect, meaning the diameter of the bubble generator 312 is smaller than the diameter of the inlet pipe 311, thus forming a constricted section. The other end of the bubble generator 312 (as shown) Figure 2 The left end of the bubble generator 312 (shown) is connected to the gas collection tank 32. Specifically, according to Bernoulli's principle, in a fluid system, velocity and pressure are inversely proportional. When water flows through this constriction section, the water velocity increases and the pressure decreases. When the pressure decreases to a certain level, the gases originally dissolved in the water precipitate due to the decrease in solubility, forming initial bubbles. At the same time, external gases (such as air or other specific gases) can be actively introduced into the low-pressure area. These gases are rapidly cut and dispersed into tiny bubbles under the strong shearing and impact of the high-speed water flow. These tiny bubbles mix with the water flow to form bubble water. Subsequently, the bubble generator 312 transports the generated bubble water to the gas collection tank 32 connected at the other end for further separation and processing of large bubbles, ultimately obtaining the target bubble water that meets irrigation requirements.

[0044] According to an embodiment of this utility model, bubble water is generated using the Venturi effect, resulting in a simple structure for the bubble generator 312, which is easy to integrate with the water inlet pipe 311. This design allows bubbles to be generated naturally as water flows through the pipe, eliminating the need for additional complex equipment.

[0045] In some illustrative embodiments, in the actual design of the bubble generator 31, a single technology can be used alone, or multiple technologies can be combined, depending on specific needs and conditions, to achieve better bubble generation results. For example, the Venturi effect can be used for initial bubble generation, and then cavitation effect, microporous aeration, ultrasonic waves, and other technologies can be combined to further refine the bubble size, thereby improving the quality and quantity of micro- and nano-bubbles.

[0046] like Figure 2 As shown, according to an embodiment of the present invention, the bubble generating unit 31 further includes an oxygenator 313. The oxygenator 313 can be connected to the bubble generator 312. The oxygenator 313 is configured to provide oxygen to the bubble water. The oxygenator 313 can be a pressure swing adsorption (PSA) oxygen generator. Specifically, the oxygen outlet of the PSA oxygen generator can be connected to the low-pressure zone of the bubble generator 312. The oxygen generator uses air as raw material and is filled with molecular sieve adsorbent. Under a certain pressure, impurities such as nitrogen and carbon dioxide in the air are adsorbed by the molecular sieve, while oxygen is enriched. The enriched oxygen is transported through the oxygen outlet and pipeline to the low-pressure zone of the bubble generator 312, where it mixes thoroughly with the water flow and bubbles generated by the Venturi effect to form bubble water with high oxygen content. Furthermore, the PSA oxygen generator can be a cuboid or cubic box structure for easy installation and placement. The PSA oxygen concentrator has an operation panel and display screen on the front for setting parameters (such as oxygen concentration and flow rate) and displaying the equipment's operating status (such as pressure and operating mode). The side has an air inlet (connected to the air filter 12 to ensure clean air entering the oxygen concentrator) and an oxygen outlet (connected to the bubble generator 312). The oxygen flow rate and pressure of the oxygen concentrator can be adjusted according to the oxygen demand of the bubble generator 312 to ensure a stable oxygen supply.

[0047] According to an embodiment of this utility model, the oxygenator 313 can continuously provide high-concentration oxygen to the bubbled water, replacing the ordinary gas source with an oxygen source. This extends the duration of microbubbles in the irrigation water, ensuring that the irrigation water reaches the crop roots, increasing the dissolved oxygen content in the irrigation water, and maintaining it at a high level to meet the oxygen requirements of the crop roots, effectively promoting root development and nutrient absorption. Furthermore, the integration of oxygen into the bubbles improves their stability and activity, enhances their mass transfer efficiency in water, making oxygen more readily available to the crop roots, and reduces bubble escape and loss during transport.

[0048] In some illustrative embodiments, in addition to PSA oxygen generators, other methods such as liquid oxygen tanks can also be used to supply oxygen.

[0049] According to an embodiment of this utility model, a water pump 33 is provided between the bubble generator 312 and the water inlet pipe 311. Specifically, the water pump 33 may include a pump body, a motor, a water pump inlet, and a water pump outlet. The pump body may be cylindrical or volute-shaped, and is made of cast iron or stainless steel, possessing good strength and corrosion resistance. The cylindrical pump body has a regular internal space, facilitating smooth water flow; the volute-shaped pump body helps to efficiently convert the kinetic energy of the water ejected by the impeller into pressure energy. The motor is connected to the pump body, and the motor body may be cylindrical in shape, with a casing made of metal (such as aluminum alloy) for good heat dissipation, ensuring heat dissipation during motor operation. The motor shaft of the motor is connected to the impeller shaft of the pump body, providing power for the operation of the water pump 33. In addition, the water pump inlet is connected to the water inlet pipe 311, and the water pump outlet is connected to the aerator 312. The ports of the water pump inlet and outlet can be round to facilitate connection with the pipe via flange or thread. The installation direction of the water pump 33 can be adjusted according to installation requirements (such as horizontal or vertical installation).

[0050] In some illustrative embodiments, when the water pump 33 is running, it applies a force to the irrigation water, giving it kinetic and pressure energy. After passing through the water pump 33, the water flow velocity and pressure increase, creating conditions for the subsequent entry into the bubble generator 312 to form a Venturi effect. For example, increasing the water flow pressure of the irrigation water from the conventional 0.1-0.2 MPa to 0.3-0.6 MPa and the water flow velocity from 1-2 m / s to 3-6 m / s, the velocity change and pressure difference within the contraction section promote the precipitation of dissolved gases in the water or the introduction and cutting of external gases into micro- and nano-bubbles. On the other hand, by precisely controlling the motor speed and water flow parameters in the water pump 33, the intensity of the Venturi effect can be adjusted, thereby controlling the amount and size distribution of bubbles generated. For example, when more micro- and nano-bubbles are needed, increasing the motor speed in the water pump 33 enhances the pressure difference and water flow shear force, making the generated bubbles smaller and more uniform, improving the oxygenation and nutrient transport capacity of the irrigation water.

[0051] According to an embodiment of this utility model, a pressure controller is provided between the bubble generator 312 and the water pump 33. Specifically, this can be implemented on a pipe connected in series between the water pump outlet of the water pump 33 and the bubble generator 312, and connected to upstream and downstream pipes via flanges. Simultaneously, a pressure controller can also be provided between the air collecting tank 32 and the first water channel 2. Specifically, the installation location can be between the outlet pipe 324 of the air collecting tank 32 and the first water channel 2, and the pressure controller can be connected to the outlet pipe 324 and the first water channel 2 via threads or quick-connect couplings, respectively.

[0052] According to an embodiment of this utility model, the pressure controller between the bubble generator 312 and the water pump 33 can be used to stabilize the Venturi effect, for example, ensuring that the water pressure entering the bubble generator 312 is stable at 0.3-0.6 MPa, and maintaining the flow velocity in the contraction section at 5-15 m / s. It can also be used to protect the equipment, for example, to prevent water hammer impact from damaging the internal structure of the bubble generator 312 at the moment the water pump 33 starts. Furthermore, it can be used in conjunction with the frequency converter of the water pump 33; when the pressure controller detects water pressure fluctuations, the frequency converter automatically adjusts the speed of the motor in the water pump 33 to reduce energy consumption.

[0053] According to an embodiment of this utility model, the pressure controller between the gas collecting tank 32 and the first water channel 2 can be used to optimize irrigation pressure, for example, to stabilize the pressure of the mixed irrigation water at 0.15-0.3 MPa, matching the requirements of drip irrigation tape (working pressure 0.1-0.2 MPa) or micro-sprinkler systems (0.2-0.4 MPa). It can also be used to prevent air bubble escape, for example, by maintaining positive pressure (≥0.1 MPa) within the pipeline, inhibiting the expansion and rupture of micro- and nano-bubbles during transport due to pressure reduction, and reducing dissolved oxygen loss. It can also be used for system linkage, for example, linked with the liquid level sensor of the gas collecting tank 32, automatically reducing pressure when the water level in the tank 321 is below a threshold to prevent "airlock" phenomena.

[0054] According to an embodiment of this utility model, the pressure controller may include a back pressure valve 34 and a constant pressure frequency converter 35. The back pressure valve 34 may be connected in series in the pipeline between the bubble generator 312 and the water pump 33. The constant pressure frequency converter 35 may be connected between the air collection tank 32 and the first water channel 2.

[0055] In some illustrative embodiments, the back pressure valve 34 may employ a piston-type or diaphragm-type structure. The piston-type back pressure valve 34 includes a piston, spring, and valve seat. The diaphragm-type back pressure valve 34 uses an elastic diaphragm instead of a piston. A pressure adjustment knob (with a dial) may be provided on the top of the back pressure valve 34 to manually set the back pressure value.

[0056] In some illustrative embodiments, the back pressure valve 34 can communicate with a host computer to automatically adjust the pressure based on soil moisture sensor data, for example, increasing the pressure during drought and decreasing the pressure during wet conditions.

[0057] In some illustrative embodiments, the constant pressure frequency converter 35 may be connected to a pressure sensor. The pressure sensor detects the pressure between the bubble generator 312 and the water pump 33, and based on the detection result, the constant pressure frequency converter 35 controls the pressure between the bubble generator 312 and the water pump 33 to keep it stable, so as to achieve a stable supply of irrigation raw water to the bubble generator 312.

[0058] According to the embodiments of this utility model, through the synergistic effect of the back pressure valve 34 and the constant pressure frequency converter 35, precise control is achieved for the pressure range required for the bubble generator 312 to generate micro-nano bubbles. That is, the constant pressure frequency converter 35 stably provides the inlet pressure, and the back pressure valve 34 stabilizes and adjusts the outlet pressure, thereby improving the stability and energy efficiency of the irrigation device using irrigation water containing micro-nano bubbles provided by this utility model.

[0059] In some illustrative embodiments, a flow monitoring device 13 can be installed on the main waterway 1 to monitor the water flow in real time. A flow regulating valve and a water quality monitor can also be installed downstream of the first waterway 2. The flow regulating valve can adjust the flow of irrigation water according to actual irrigation needs, and the water quality monitor can monitor the water quality parameters of the irrigation water in real time, such as pH and dissolved oxygen.

[0060] In some illustrative embodiments, a manual control valve 14 can be installed on the main waterway 1 to manually control the start or stop of irrigation. For example, if the flow monitoring device 13 detects an abnormality in irrigation, the manual control valve 14 can be manually closed to quickly stop irrigation.

[0061] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this utility model. In particular, the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways without departing from the spirit and teachings of this utility model. All such combinations and / or combinations fall within the scope of this utility model.

[0062] The embodiments of the present invention have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the present invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the present invention, and all such substitutions and modifications should fall within the scope of the present invention.

Claims

1. A device for irrigation using irrigation water containing micro-nano bubbles, characterized in that, include: main waterway(1); The first waterway (2) is connected to the main waterway (1); The second waterway (3) includes: A bubble generating unit (31), one end of which is connected upstream of the main waterway (1) and the first waterway (2), is configured to generate bubble water using irrigation water from the main waterway (1); and A gas collecting tank (32) is connected at one end to the other end of the bubble generating unit (31), and at the other end of the gas collecting tank (32) is connected to the downstream of the first water channel (2). The gas collecting tank (32) is configured to remove bubbles with a volume greater than a predetermined volume from the bubble water to obtain target bubble water. The target bubble water is combined with the irrigation water in the first waterway (2) downstream to generate irrigation water for irrigation.

2. The apparatus according to claim 1, characterized in that, The gas collecting tank (32) includes: The tank (321) has a receiving space for accommodating the bubble water and a first inlet (322) for allowing the bubble water to enter. The inner wall of the tank (321) and the surface of the bubble water form a gas collecting chamber (323), and the bubbles to be expelled float to the gas collecting chamber (323). The outlet pipe (324) extends from the lower part of the accommodating space out of the tank (321), and the target bubble water after removing the bubbles flows into the first water channel (2) through the outlet pipe (324).

3. The apparatus according to claim 2, characterized in that, The top of the tank (321) is provided with an exhaust port (325) that allows the air bubbles to be discharged, and an exhaust valve (326) is provided at the exhaust port (325).

4. The apparatus according to claim 2, characterized in that, The gas collection chamber (323) is connected to a pressure relief valve (327).

5. The apparatus according to any one of claims 1-4, characterized in that, The main waterway (1) includes: The main water inlet (11) is through which the irrigation raw water enters the main waterway (1); and A filtration device (12) is configured to filter the irrigation water.

6. The apparatus according to any one of claims 1-4, characterized in that, The bubble generating unit (31) includes: The inlet pipe (311) is connected upstream of the main waterway (1) and the first waterway (2); and A bubble generator (312) is connected at one end to the water inlet pipe (311) to form a Venturi effect, and at the other end to the gas collection tank (32). The bubble generator (312) is configured to generate the bubble water.

7. The apparatus according to claim 6, characterized in that, The bubble generating unit (31) also includes an oxygen supply unit (313) connected to the bubble generator (312), and the oxygen supply unit (313) is configured to provide oxygen to the bubble water.

8. The apparatus according to claim 6, characterized in that, A water pump (33) is provided between the bubble generator (312) and the water inlet pipe (311).

9. The apparatus according to claim 8, characterized in that, A pressure controller is provided between the bubble generator (312) and the water pump (33), and between the gas collecting tank (32) and the first water channel (2).

10. The apparatus according to claim 9, characterized in that, The pressure controller includes a back pressure valve (34) and a constant pressure frequency converter (35).

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