High-concentration nano-bubble manufacturing device suitable for various media and manufacturing method thereof

Abstract

The application discloses a kind of high concentration nano bubble manufacturing device suitable for multiple medium and manufacturing method thereof, it is related to nanobubble generation technical field.The device is by sequentially connected micron bubble manufacturing unit, bubble group flow state conversion unit and nanometer bubble manufacturing unit composition.Micron bubble manufacturing unit realizes gas-liquid mixing, cutting bubble by Venturi effect;Bubble group flow state conversion unit utilizes guide flow hole, micro-diameter pipe and vortex tube to convert gas, liquid two-phase high-speed jet into high-speed rotational flow;Nanometer bubble manufacturing unit utilizes multistage compression to convert micron bubble into nanometer bubble.The application is coupled by micron bubble manufacturing, fluid flow state conversion, nanometer bubble manufacturing structure unit, and quickly generates size uniform (100~200nm), concentration high nanometer bubble (>10 0 P / mL), with low energy consumption and strong anti-blocking performance, can solve the problems of large bubble size, uneven size and easy to coalesce of traditional bubble manufacturing device.

Description

Technical Field

[0001] This invention relates to the field of nanobubble generation, and more particularly to an apparatus and method for manufacturing high-concentration nanobubbles in various media. Background Technology

[0002] Nanobubbles are tiny bubbles with diameters ranging from 1 nm to 1000 nm. They possess an extremely large specific surface area, significantly improving gas-liquid mass transfer efficiency and reaction rates. Nanobubbles have extremely long residence times in water and rise slowly, enabling continuous action. The surface charge of nanobubbles enhances their stability and pollutant adsorption capacity, and the free radicals generated upon collapse possess strong oxidizing properties. These characteristics give them significant advantages in water treatment, biomedicine, and agriculture.

[0003] Nanobubble manufacturing technology is moving from the laboratory to industrialization, exhibiting diversified development. Currently, hydraulic shearing technologies such as dissolved gas release and cyclone shearing are relatively mature and have been initially applied in water treatment, aquaculture, and other fields, with the core being the optimization of structure and materials. Meanwhile, cutting-edge technologies such as microchannels and ultrasonic cavitation are developing rapidly, producing smaller, more uniformly distributed nanobubbles, showing potential in precision fields such as biomedicine. However, this technology still faces significant challenges. The primary issue is energy efficiency; smaller bubbles require higher energy consumption, limiting its large-scale application. Secondly, precise control of bubble size and concentration remains difficult, and most manufacturing methods produce nanobubbles with uneven distribution. Furthermore, high manufacturing costs, susceptibility to component clogging and wear, and the challenge of scaling up from laboratory devices to industrial-grade equipment all hinder its widespread adoption.

[0004] At present, the development of nanobubble generators faces the following main challenges: 1. Poor adaptability to multiple media: When treating oily wastewater or solid slurry, conventional nanobubble manufacturing technology is prone to bubble aggregation due to turbulent flow field or blockage of bubble manufacturing device due to dead corners in the flow channel.

[0005] 2. The contradiction between energy consumption and efficiency: In order to obtain smaller microbubbles, higher input energy (such as high-pressure pumps) is often required, resulting in low energy efficiency ratio.

[0006] 3. Uneven bubble size distribution: A single shearing or cavitation mechanism is insufficient to guarantee the uniformity of bubble size, and the product is often a mixture of micron-sized and nano-sized bubbles.

[0007] To address the aforementioned technical challenges, the development of nanobubble generators requires comprehensive consideration of factors such as bubble size, quantity concentration, energy consumption, and applicability to multi-media environments. This is crucial for their transition from laboratory research to industrialization. Therefore, there is an urgent need for a nanobubble manufacturing technology and device that can adapt to complex multi-media environments, consumes low energy, and stably outputs high-concentration, small-sized, and uniformly distributed nanobubbles, overcoming the technical problems of low efficiency and narrow applicability of existing nanobubble generators. Summary of the Invention

[0008] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a device and method for generating high-concentration nanobubbles in various media, which can generate small-sized, high-concentration nanobubbles in complex multi-media environments, thus solving the technical problems of low efficiency, uneven bubble size distribution, and easy clogging of existing nanobubble generators in complex media.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention provides a device for manufacturing high-concentration nanobubbles in various media, comprising a micron-scale bubble manufacturing unit, a bubble swarm flow state conversion unit, and a nano-scale bubble manufacturing unit that are detachably connected together in sequence along the fluid flow direction; The micron-scale bubble manufacturing unit includes a Venturi structure consisting of a gas storage chamber, a first constriction tube, and a first flared tube. The gas storage chamber has a liquid inlet pipe at its front end, and a conical nozzle at its outlet. The outlet of the conical nozzle extends into the gas storage chamber and aligns with the inlet of the first constriction tube. The gas storage chamber is connected to a gas inlet pipe. The micron-scale bubble manufacturing unit is used to draw in gas and generate micron-scale bubble fluid through the Venturi effect. The bubble swarm flow state conversion unit is used to convert the flow state of the bubble swarm fluid from the micron-level bubble manufacturing unit from a high-speed jet to a high-speed rotating flow. It includes a cylinder connected to and adapted to the outlet of a first flared pipe, a vortex tube disposed within the cylinder, and multiple inclined guide holes on the sidewall of the vortex tube. Through a specific porous vortex tube structure, the flow state of the bubble swarm fluid (high-speed turbulent jet of gas and liquid two phases) from the micron-level bubble manufacturing unit is converted from a high-speed jet to a regular high-speed rotating flow. This rotating flow not only prevents bubbles from coalescing during transport but also utilizes centrifugal force to orderly guide solid particles or oil droplets in the fluid, preventing blockage. The end of the vortex tube near the first flared pipe is tapered and equipped with an exhaust tailpipe; a guide chamber is also formed between the outer wall of the vortex tube and the inner wall of the cylinder. The device employs a three-step method—"micron-level bubble manufacturing, bubble cluster flow state conversion, and nano-level bubble manufacturing"—to ensure that the bubble particle size is concentrated in the range of 100–200 nm, with an average size d. 50Narrow distribution range; The device is suitable for media including pure water, oil-water mixtures, and solid-containing slurries, and the generated nanobubbles can all be maintained for 10¹ 0 High concentrations above P / mL without clogging.

[0010] The end of the vortex tube near the first flared tube is tapered and has an exhaust tailpipe; the tail end of the vortex tube is sealed with the inner wall of the cylinder, and a flow guide chamber is formed between the outer wall of the vortex tube and the inner wall of the cylinder. The nanoscale bubble manufacturing unit is used to perform compression shearing and cavitation treatment on micron-sized bubble fluid in a high-speed rotating flow state, breaking the micron-sized bubbles into nanoscale bubbles. It includes a guide cone, a second constriction tube and a second flaring tube connected in sequence. The inlet of the guide cone is connected to the liquid outlet at the end of the vortex tube.

[0011] Preferably, the cone angle of the conical nozzle is ≤47° and its outlet diameter is ≤1mm; the diameter of the first constrictor is 1-2mm and its length is 5-8mm.

[0012] Preferably, the vortex tube is a hollow cylindrical structure, with its central axis coinciding with the main axis of the device; the angle between the guide hole and the tangent direction of the side wall of the vortex tube is 30° to 60°.

[0013] Preferably, the vortex tube has at least four rows of guide holes arranged axially on its sidewall, and the diameter of the guide holes is 1.5 to 3.5 mm.

[0014] Preferably, the diameter of the exhaust tailpipe is between 1 and 2 mm; the diameter of the liquid outlet is smaller than the diameter of the cylinder, and the inlet size of the guide cone is the same as the liquid outlet size.

[0015] Preferably, the diameter of the second constricted tube is 2 to 2.3 mm and the length is 8 to 12 mm; the expansion angle of the second flared tube is ≥64°.

[0016] Preferably, the micron-level bubble manufacturing unit, the bubble swarm flow state conversion unit, and the nano-level bubble manufacturing unit adopt a modular design, which facilitates the adjustment of the parameters of each unit according to different working conditions (such as replacing the bubble swarm flow state conversion unit with different apertures), and is beneficial for industrial scale-up.

[0017] The present invention also provides a method for manufacturing high-concentration nanobubbles using the aforementioned high-concentration nanobubble manufacturing apparatus applicable to various media, comprising the following steps: S1: The liquid medium is pumped into the micron-level bubble manufacturing unit through the liquid inlet, and gas is drawn in from the gas inlet pipe by utilizing the negative pressure effect generated at the first constriction tube. The flow rate of the introduced liquid is 1.5–1.7 L / min, and the flow rate of the introduced gas is 0.1–0.15 L / min; The gas and liquid phases mix and shear within the first constriction tube and the first flare tube to form a microbubble swarm fluid containing micron-sized bubbles; S2: After the microbubble swarm fluid enters the bubble swarm flow state conversion unit, it is guided by the guide holes on the side wall of the vortex tube to form a high-speed rotating vortex, which converts the microbubble swarm fluid from a high-speed jet to a high-speed rotating flow, and rectifyes the microbubble swarm fluid and initially refines the microbubbles. S3: The microbubble cluster in a high-speed rotating flow state enters the nanoscale bubble manufacturing unit, where it is accelerated and undergoes compression shearing and cavitation within the second constriction tube, breaking the micron-sized bubbles into nanoscale bubbles, which are then ejected from the second flared tube, releasing a high concentration of nanobubbles.

[0018] Beneficial effects: 1. This invention achieves progressive refinement and stable control of bubbles through a three-level structural coupling of "micron-level bubble manufacturing—fluid state conversion—nano-level bubble manufacturing," ensuring that the bubble particle size is highly concentrated in the range of 100–200 nm and the average size distribution range is extremely narrow. This overcomes the problems of wide bubble size distribution (mixture of micron- and nano-level bubbles) and low concentration in existing technologies, achieving stable production of highly monodisperse and high-concentration nanobubbles.

[0019] 2. The bubble flow state conversion unit adopts a vortex tube and sidewall guide hole structure to convert the high-speed jet into a high-speed rotating flow field. The rotating flow field can effectively guide oil droplets or solid particles, avoiding their deposition in dead corners of the flow channel, and solving the problems of easy clogging and bubble coalescence caused by turbulent flow field in traditional devices in multi-media environments.

[0020] 3. This invention utilizes the fluid's own kinetic energy to progressively refine bubbles, eliminating the need for additional high-pressure pumps or high-energy-consuming equipment such as ultrasonic generators. It overcomes the traditional bottleneck that "smaller bubble sizes lead to higher energy consumption," significantly improving energy efficiency and making it economically viable for industrial application.

[0021] 4. Each unit can be independently disassembled and its parameters replaced (such as vortex tubes with different apertures, or reducing tubes of different lengths), facilitating adaptation to media characteristics. This overcomes the problems of bulky structure and poor adaptability of existing devices when scaled up from the laboratory to industrial levels, providing a flexible and scalable solution for multi-scenario applications.

[0022] 5. This device can be manufactured using various processes such as resin 3D printing or metal processing. It has fewer parts, is simple to assemble, and is suitable for mass production. Compared with complex manufacturing technologies such as microchannels and ultrasonic cavitation, this invention significantly reduces manufacturing costs and maintenance difficulty while ensuring high performance.

[0023] In summary, this invention achieves high adaptability to complex media under low energy consumption conditions through the synergistic effect of three-level structural units, and can stably output nanobubbles with concentrated size and high concentration, effectively solving the core problems of uneven bubble size, easy clogging and high energy consumption in the prior art. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0025] Figure 1 This is a physical image of the nanobubble device in the embodiment of the invention; Figure 2 This is a schematic diagram of the nanobubble device in an embodiment of the invention; Figure 3 This is a schematic diagram of the structure of the micron-level bubble manufacturing unit of the nanobubble device in the embodiment of the invention; Figure 4 This is a schematic diagram of the structure of the bubble group flow state conversion unit of the nanobubble device in the embodiment of the invention; Figure 5 This is a schematic diagram of the structure of the nanoscale bubble manufacturing unit of the nanobubble device in the embodiment of the invention; Figure 6 The nanobubble particle size and concentration in Example 1 of the invention; Figure 7 The nanobubble particle size and concentration in Example 2 of the invention; Figure 8 The nanobubble particle size and concentration in Example 3 of the invention.

[0026] The markings in the diagram are as follows: 1-Micron-level bubble manufacturing unit, 11-Liquid inlet pipe, 12-Conical nozzle, 13-Gas inlet pipe, 14-Gas storage chamber, 15-First constriction pipe, 16-First flaring pipe, 2-Bubble cluster flow state conversion unit, 21-Cylinder, 22-Exhaust tailpipe, 23-Vortex tube, 24-Guide hole, 25-Liquid outlet, 3-Nanometer-level bubble manufacturing unit, 31-Guide cone pipe, 32-Second constriction pipe, 33-Second flaring pipe. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1, as Figures 1 to 5 As shown, this embodiment of the invention provides a device for manufacturing high-concentration nanobubbles in various media, including a micron-scale bubble manufacturing unit 1, a bubble group flow state conversion unit 2, and a nano-scale bubble manufacturing unit 3 that are detachably connected together in sequence along the fluid flow direction. The micron-sized bubble manufacturing unit 1 is used to draw in gas and generate micron-sized bubble fluid through the Venturi effect. It includes a Venturi structure consisting of a gas storage chamber 14, a first constriction tube 15, and a first flared tube 16. The front end of the gas storage chamber 14 is provided with a liquid inlet pipe 11, and the end of the liquid inlet pipe 11 is provided with a conical nozzle 12. The outlet of the conical nozzle 12 extends into the gas storage chamber 14 and is aligned with the inlet of the first constriction tube 15. The gas storage chamber 14 is connected to a gas inlet pipe 13. In this embodiment, the diameter of the gas inlet pipe 13 is less than or equal to that of the liquid inlet pipe 11. The volume of the gas storage chamber 14 is greater than or equal to 10 mL.

[0029] The bubble swarm flow state conversion unit 2 is used to convert the flow state of the bubble swarm fluid from the micron-level bubble manufacturing unit 1 from a high-speed jet to a high-speed rotating flow. It includes a cylinder 21 connected to and adapted to the outlet of the first flared pipe 16, a vortex tube 23 disposed in the cylinder 21, and a plurality of inclined guide holes 24 opened on the side wall of the vortex tube 23. Through a specific porous vortex tube structure, the flow state of the bubble swarm fluid (gas and liquid two-phase high-speed turbulent jet) from the micron-level bubble manufacturing unit 1 is converted from a high-speed jet to a regular high-speed rotating flow. This rotating flow can not only prevent the bubbles from coalescing during the transportation process, but also use centrifugal force to guide the solid particles or oil droplets in the fluid in an orderly manner to prevent blockage.

[0030] The end of the vortex tube 23 near the first flared tube 16 is tapered and has an exhaust tail pipe 22 at the end; the tail end of the vortex tube 23 is sealed with the inner wall of the cylinder, and a flow guide chamber is formed between the outer wall of the vortex tube 23 and the inner wall of the cylinder 21. The nanoscale bubble manufacturing unit 3 is used to perform compression shearing and cavitation treatment on the micron-sized bubble fluid in a high-speed rotating flow state, breaking the micron-sized bubbles into nanoscale bubbles. It includes a guide cone tube 31, a second constriction tube 32 and a second flaring tube 33 connected in sequence. The inlet of the guide cone tube 31 is connected to the liquid outlet 25 at the end of the vortex tube 23.

[0031] In this embodiment, the cone angle of the conical nozzle 12 is ≤47° and its outlet diameter is ≤1mm; the diameter of the first constrictor 15 is 1~2mm and its length is 5~8mm.

[0032] In this embodiment, the vortex tube 23 is a hollow cylindrical structure, and its central axis coincides with the main axis of the device; the angle between the guide hole and the tangent direction of the side wall of the vortex tube 23 is 30° to 60°.

[0033] In this embodiment, the vortex tube 23 has four rows of 16 guide holes arranged axially on its sidewall, and the diameter of the guide holes is 2mm.

[0034] In this embodiment, the diameter of the exhaust tailpipe 22 is between 1 and 2 mm; the diameter of the liquid outlet 25 is smaller than the diameter of the cylinder 21, and the inlet size of the guide cone 31 is the same as the size of the liquid outlet 25.

[0035] In this embodiment, the diameter of the second constricted tube 32 is 2-2.3 mm and the length is 8-12 mm; the expansion angle of the second flared tube 33 is ≥64°.

[0036] In this embodiment, the manufacturing method of this device includes, but is not limited to, resin 3D printing, metal processing and other processes.

[0037] In this embodiment, the micron-level bubble manufacturing unit 1, the bubble group flow state conversion unit 2, and the nano-level bubble manufacturing unit 3 are respectively fixed with a first cylinder, a second cylinder, and a third cylinder, forming their respective installation modules; the first cylinder, the second cylinder, and the third cylinder can be fixed by interlocking with each other, and can be independently disassembled and flexibly combined, including but not limited to assembling various suitable nano bubble generators; This embodiment also provides a method for manufacturing high-concentration nanobubbles using the aforementioned high-concentration nanobubble manufacturing device. The liquid used is pure water. Specifically, the method involves connecting the experimental platform including the nanobubble manufacturing device, adding 500 mL of ultrapure water to a beaker, adjusting the water pump flow rate to 1.7 L / min, adjusting the gas flow meter to control the gas flow rate to 150 mL / min, running for 10 minutes, taking 10 mL of water sample and allowing it to stand for 2-3 hours, and then using a nanoparticle size analyzer (NTA) to test the particle size distribution and concentration of the nanobubbles. Figure 6 The test results show that the nanobubble manufacturing device generates nanobubbles with an average particle size of 152 nm and a bubble concentration of 2.3 × 10⁻⁶ under pure water conditions. 10 P / mL, the bubble size distribution curve shows a sharp peak, indicating good monodispersity.

[0038] Example 2 This embodiment provides a high-concentration nanobubble manufacturing device, which has the same structure as Embodiment 1, except that the fluid used in this embodiment is an oil-water mixture; the method for manufacturing high-concentration nanobubbles using the high-concentration nanobubble manufacturing device applicable to various media provided in this embodiment is as follows: Connect the experimental platform, including the nanobubble manufacturing device, and add 500 mL of oil-water mixture (5% diesel content) to a beaker. Adjust the water pump flow rate to 1.5 L / min and the gas flow meter to 150 mL / min. Run the test for 10 minutes, then take a water sample containing nanobubbles and let it stand for 2–3 hours. Use a nanoparticle size analyzer (NTA) to test the particle size distribution and concentration of the nanobubbles. Figure 7 The test results show that the nanobubble manufacturing device generates nanobubbles with an average particle size of 165 nm and a bubble concentration of 1.5 × 10⁻⁶ under oil-water mixture conditions. 10 P / mL indicates that the bubble swarm flow state conversion unit effectively prevents oil phase interference, and the generation of nanobubbles remains stable.

[0039] Example 3 This embodiment provides a device for manufacturing high-concentration nanobubbles in various media. Its structure is the same as in Embodiment 1, except that the fluid used in this embodiment is a solid-containing slurry. The method for manufacturing high-concentration nanobubbles using this device is as follows: Connect the experimental platform including the device; add 500 mL of solid-containing slurry (2.5 g / L solid content) to a beaker; adjust the water pump flow rate to 1.7 L / min; adjust the gas flow meter to control the gas flow rate to 150 mL / min; run for 10 min; take 10 mL of water sample and let it stand for 2-3 hours; use a nanoparticle size analyzer (NTA) to test the particle size distribution and concentration of the nanobubbles. Figure 8 The test results show that the nanobubble manufacturing device generates nanobubbles with an average particle size of 143 nm and a bubble concentration of 1.3 × 10⁻⁶ in a slurry containing solid particles. 10 P / mL. Solid particles in the fluid did not clog the device and actually facilitated the cavitation and breakup of bubbles, resulting in a slight reduction in the size of the nanobubbles.

[0040] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A device for manufacturing high-concentration nanobubbles under various media conditions, characterized in that, It includes a micron-level bubble manufacturing unit (1), a bubble group flow state conversion unit (2), and a nano-level bubble manufacturing unit (3) that are connected sequentially in a detachable manner along the fluid flow direction; it ensures that the bubble particle size is concentrated in the range of 100 to 200 nm through a three-step method of "micron-level bubble manufacturing - bubble group flow state conversion - nano-level bubble manufacturing"; The micron-level bubble manufacturing unit (1) draws in gas and generates micron-level bubble fluid through the Venturi effect. It includes a Venturi structure consisting of a gas storage chamber (14), a first constriction tube (15), and a first flared tube (16). The front end of the gas storage chamber (14) is provided with a liquid inlet pipe (11), and the outlet of the liquid inlet pipe (11) is provided with a conical nozzle (12). The outlet of the conical nozzle (12) extends into the gas storage chamber (14) and is aligned with the inlet of the first constriction tube (15). The gas storage chamber (14) is connected to a gas inlet pipe (13). The bubble swarm flow state conversion unit (2) converts the flow state of the bubble swarm from the micron-level bubble manufacturing unit (1) from a high-speed jet to a high-speed rotating flow. It includes a cylinder (21) connected to and adapted to the outlet of the first flared pipe (16), a vortex tube (23) disposed in the cylinder, and a plurality of inclined guide holes (24) opened on the side wall of the vortex tube (23). The end of the vortex tube (23) near the first flared pipe (16) is tapered and is provided with an exhaust tail pipe 22. A guide chamber is also formed between the outer wall of the vortex tube (23) and the inner wall of the cylinder (21). The nanoscale bubble manufacturing unit (3) performs compression shearing and cavitation treatment on the micron-sized bubble fluid in a high-speed rotating flow state, breaking the micron-sized bubbles into nanoscale bubbles. It includes a flow guide cone (31), a second constriction tube (32), and a second flaring tube (33) connected in sequence. The inlet of the flow guide cone (31) is connected to the liquid outlet (25) at the end of the vortex tube (23). The device is suitable for media including pure water, oil-water mixtures, and solid-containing slurries, and the generated nanobubbles can all be maintained for 10¹ 0 High concentrations above P / mL without clogging.

2. The high-concentration nanobubble manufacturing device applicable to various media conditions according to claim 1, characterized in that, The cone angle of the conical nozzle (12) is ≤47° and its outlet diameter is ≤1mm; the diameter of the first constrictor (15) is 1~2mm and its length is 5~8mm.

3. The high-concentration nanobubble manufacturing device applicable to various media conditions according to claim 1, characterized in that, The vortex tube (23) is a hollow cylindrical structure, and its central axis coincides with the main axis of the device; the angle between the guide hole (24) and the tangent direction of the side wall of the vortex tube (23) is 30° to 60°.

4. The high-concentration nanobubble manufacturing device applicable to various media conditions according to claim 1, characterized in that, The vortex tube (23) has at least four rows of guide holes (24) arranged axially on its sidewall, and the diameter of the guide holes (24) is 1.5 to 3.5 mm.

5. The high-concentration nanobubble manufacturing device applicable to various media conditions according to claim 1, characterized in that, The diameter of the exhaust tailpipe (22) is between 1 and 2 mm; the diameter of the liquid outlet (25) is smaller than the diameter of the cylinder (21); and the inlet size of the guide cone (31) is the same as the size of the liquid outlet (25).

6. The high-concentration nanobubble manufacturing device suitable for various media conditions according to claim 1, characterized in that, The diameter of the second constricting tube (32) is 2 to 2.3 mm and the length is 8 to 12 mm; the expansion angle of the second flared tube (33) is ≥64°.

7. The high-concentration nanobubble manufacturing device applicable to various media conditions according to claim 1, characterized in that, The micron-level bubble manufacturing unit (1), the bubble group flow state conversion unit (2), and the nano-level bubble manufacturing unit (3) adopt a modular design, which makes it easy to adjust the parameters of each unit according to different working conditions and is conducive to industrial scale-up.

8. A method for manufacturing high-concentration nanobubbles using the high-concentration nanobubble manufacturing apparatus according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1: The liquid medium is pumped into the micron-sized bubble manufacturing unit (1) through the liquid inlet pipe (11), and gas is drawn in from the gas inlet pipe (13) by utilizing the negative pressure effect generated at the first constriction pipe (15). The gas and liquid phases are mixed and sheared in the first constriction tube (15) and the first flare tube (16) to form a microbubble swarm fluid containing micron-sized bubbles; S2: After the microbubble swarm fluid enters the bubble swarm flow state conversion unit (2), it is guided by the guide hole (24) on the side wall of the vortex tube (23) to form a high-speed rotating vortex, which converts the microbubble swarm fluid from a high-speed jet to a high-speed rotating flow, and rectifyes and initially refines the microbubbles; S3: The microbubble cluster fluid in a high-speed rotating flow state enters the nano-scale bubble manufacturing unit (3), where it is accelerated and undergoes compression shearing and cavitation in the second constriction tube (32), breaking the micron-scale bubbles into nano-scale bubbles, which are finally ejected from the second flared tube (33) to release high-concentration nanobubbles.

9. The method for manufacturing high-concentration nanobubbles using the high-concentration nanobubble manufacturing apparatus according to claim 8, characterized in that, The liquid flow rate is 1.5–1.7 L / min, and the gas flow rate is 0.1–0.15 L / min.

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