Extensible micro-nano bubble generating device and generating method

Abstract

This invention relates to a scalable micro / nano bubble generator and method; it includes a liquid inlet assembly and an integrated shell assembly. The liquid inlet assembly is connected to the integrated shell assembly via several rotary cutting generator assemblies. Each rotary cutting generator assembly includes at least a constricted section connected to the liquid inlet assembly and a diffuser section connected to the gas-liquid mixture outlet in the integrated shell assembly. A throat section is provided between the constricted section and the diffuser section, and an air inlet is provided on the integrated shell assembly corresponding to the throat section. A rotary cutting gas phase guide section is provided on the throat section and communicates with the air inlet. This device has the advantages of reasonable structural design, flexible adjustment of processing capacity while ensuring bubble quality, and reduced energy consumption and maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of micro-nano bubble generation technology, and specifically relates to a scalable micro-nano bubble generation device and generation method. Background Technology

[0002] In recent years, micro- and nanobubbles have attracted widespread attention in water purification, aquaculture, and mineral flotation due to their unique physical properties, such as small diameter, large specific surface area, stable phase interface, and long residence time in the liquid phase. Over the past few decades, several typical micro- and nanobubble generators based on fluid dynamics have been developed, such as pressurized dissolution type, spiral flow type, Venturi type, and jet type. However, their processing capacity is significantly limited: pressurized dissolution type equipment requires high-pressure pumps and pressure vessels, resulting in complex structures and high costs. The processing capacity of a single unit shows a clear gradient, with laboratory-scale capacity concentrated in the range of 0.1–0.5 m³. 3 / h, civilian / small industrial grade are concentrated in 0.5~2 m 3 / h, although large industrial-grade can reach 10-1000 m 3 However, while some equipment can be produced per hour, the supporting equipment is bulky and difficult to expand flexibly; spiral flow equipment mostly uses a single spiral crushing mechanism, lacks flexible expansion design, and the processing capacity of a single unit is generally between 0.3 and 3 m³. 3 / h, only suitable for small to medium-sized scenarios; Venturi-type equipment relies on negative pressure in the throat for air intake and crushing, and the processing capacity of a single unit of conventional models is 0.5 to 5 m³. 3 / h, a few customized models can reach 8 m 3 / h, cannot be expanded in parallel; the capacity of jet-type equipment is limited by the size of the jet nozzle, with a single unit processing capacity of 0.2 to 5 m³. 3 / h, and the proportion of nanobubbles is extremely low.

[0003] The aforementioned models are insufficient to meet the continuous operation requirements of medium- to large-scale industries. The main problems faced by existing equipment are concentrated in the following aspects: First, there is an imbalance in scenario adaptability, with small equipment having low processing capacity (generally 0.1–5 m³). 3 The large pressurized dissolution equipment, although capable of handling large volumes, is complex in structure, expensive, and cannot be flexibly expanded. Secondly, it has high energy consumption and maintenance costs, relies on pressurized gas sources or easily damaged parts, has low gas-liquid mixing efficiency, and is cumbersome to operate and maintain.

[0004] Therefore, there is a need to develop a scalable micro / nano bubble generator that can balance processing scale, operating cost and bubble quality. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a scalable micro / nano bubble generator and generation method.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A scalable micro / nano bubble generator is disclosed. The device includes a liquid inlet assembly and an integrated shell assembly. The liquid inlet assembly is connected to the integrated shell assembly via several rotary shearing generator assemblies. Each rotary shearing generator assembly includes at least a constricted section connected to the liquid inlet assembly and a diffuser section connected to the gas-liquid mixture outlet in the integrated shell assembly. A throat section is provided between the constricted section and the diffuser section. An air inlet is provided on the integrated shell assembly corresponding to the throat section. A rotary shearing gas phase guide section is provided on the throat section and communicates with the air inlet.

[0007] The beneficial effects of the present invention are as follows: The present invention adopts a technical solution that connects the liquid inlet component and an integrated shell component (the integrated shell component includes an air inlet and a gas-liquid mixture outlet) that can accommodate a number of rotary cutting generating components. The above technical solution can flexibly adjust the processing capacity of the micro-nano bubble generating device according to the actual situation by selecting the number of rotary cutting generating components. At the same time, it can achieve the micro-nanoization of bubbles without relying on a pressurized gas source and ensure the quality of bubbles.

[0008] Preferably, the liquid inlet assembly includes an outer flange structure, the inner side of the flange structure is an integrated cylindrical structure, the inner bottom of the cylindrical structure is provided with a baffle plate, the baffle plate is provided with a plurality of liquid phase guide holes, the liquid phase guide holes are connected to the inlet of the constricted section, and the plurality of liquid phase guide holes are provided in a one-to-one correspondence with the rotary cutting generator assembly.

[0009] Preferably, the inner bottom of the cylindrical structure and the baffle plate are tapered structures.

[0010] Preferably, a porous positioning plate is provided between the plurality of rotary cutting generating components and the integrated housing assembly for positioning the rotary cutting generating components and performing secondary cavitation; the gas-liquid mixture outlet of the integrated housing assembly is provided with a step for limiting the porous positioning plate, the porous positioning plate is provided with a plurality of gas-liquid mixing holes, the gas-liquid mixing holes are provided in a one-to-one correspondence with the rotary cutting generating components, and the diameter of the gas-liquid mixing holes is 0.6 to 0.8 times the diameter of the diffuser section outlet.

[0011] Preferably, the rotary cutting generator further includes a housing, the two ends of which are respectively connected to the liquid phase guide hole in the liquid inlet assembly and the gas-liquid mixing hole in the porous positioning plate. The rotary cutting gas phase guide part includes at least one gas phase guide channel disposed between the throat section and the aforementioned housing. The gas phase guide channel is tangent to the liquid channel of the throat section, and the included angle between the gas phase guide channel and the liquid channel of the throat section is 30° to 90°. The diameter of the gas phase guide channel is 0.25 to 1 times the diameter of the throat section.

[0012] Preferably, when there are multiple gas phase guiding channels, the multiple gas phase guiding channels are evenly distributed in the throat section, and the multiple gas phase guiding channels and the liquid channel inlet of the throat section are not on the same cross section.

[0013] Preferably, the rotary gas phase guide section further includes a spiral groove disposed on the inner surface of the liquid channel in the throat section. The starting end of the spiral groove is tangent to the gas phase guide channel on the side near the inlet of the throat section, and the end of the spiral groove is disposed on the side at the outlet of the throat section.

[0014] Preferably, there are multiple spiral grooves, and multiple gas phase guiding channels are tangent to the front and middle parts of the spiral grooves.

[0015] Preferably, the spiral groove is a U-shaped groove or an arc-shaped groove, the swirl angle of the spiral groove is 15° to 75°, the lead of the spiral groove is 2 to 15 times the diameter of the throat section, the depth of the spiral groove is 0.05 to 0.1 times the diameter of the throat section, and the length of the throat section is 2 to 15 times the diameter of the throat section.

[0016] The present invention also provides a method for generating a scalable micro / nano bubble generator, the method comprising the following steps: Step 1: Select the number of rotary cutting generator components to be used based on the actual working conditions, thereby determining the type of porous positioning plate and liquid inlet assembly to be used; connect the liquid phase guide hole in the liquid inlet assembly to the necking section in the corresponding rotary cutting generator component, and then place the rotary cutting generator components on the inside of the porous positioning plate, so that the diffusion section of the rotary cutting generator component is connected to the gas-liquid mixing hole in the porous positioning plate; finally, place the assembled liquid inlet assembly, rotary cutting generator component, and porous positioning plate on the inside of the step of the integrated housing assembly, and fix the outside of the liquid inlet assembly to the integrated housing assembly; the above structure is firmly connected and ensures that no leakage occurs when the sealing pressure is not less than 0.8 MPa; Step 2: The flow rate of the liquid to be processed is increased by the liquid inlet assembly under the action of the tapered structure. The liquid flow guide hole is used to make the amount of liquid entering the processing unit match the processing capacity of the rotary shearing unit while further increasing the flow rate. Step 3: The vortex generator assembly generates negative pressure through a venturi structure. Gas in the inlet is drawn into the throat section through the gas phase guide channel. The gas enters the liquid channel of the throat section through the gas phase guide channel and forms small bubbles. The gas phase guide channel is tangential to the spiral groove to generate strong vortex during the gas-liquid mixing process. The venturi structure is used to increase the flow rate, thereby enhancing the gas-liquid mixing efficiency, reducing gas agglomeration, and generating a primary cavitation effect. Furthermore, the aforementioned small bubbles deform and tear under strong swirling shearing action, forming micro-nano bubbles; Step 4: The diameter of the gas-liquid mixing hole in the porous positioning plate is smaller than the outlet diameter of the diffuser section and the outlet diameter of the gas-liquid mixture, forming a Venturi structure. This Venturi structure can achieve secondary breakup of bubbles. When the local pressure in the annular cavitation groove in the gas-liquid mixing hole is lower than the saturated vapor pressure, a secondary cavitation effect is triggered. The micro-jet generated by cavitation and the shock wave simultaneously enhance the micro-nanoization process. Step 5: After passing through the gas-liquid mixing hole in Step 4, the gas-liquid mixture decelerates after passing through the gradually expanding structure of the gas-liquid mixture outlet, and is then stably output through the gas-liquid mixture outlet.

[0017] A scalable micro / nano bubble generator and generation method, fabricated according to the above technical solution, utilizes an integrated housing assembly (which includes an air inlet and a gas-liquid mixture outlet) connected to a liquid inlet component and a multi-stage rotary shearing generation component. This allows for flexible scaling of the total processing capacity based on the number of components, enabling stable and continuous operation to meet the needs of small- to medium-scale industrial wastewater treatment, aquaculture, and gas-liquid two-phase reactions. (Based on the core design of multi-unit parallel expansion, the processing capacity of this invention can range from 1 to 20 m³.) 3 The per-hour range can be flexibly adjusted; the single-group rotary shearing unit is the smallest expansion unit, with a typical processing capacity of approximately 1~2 m³. 3 / h, constituting the lower limit of single-unit processing capacity; the integrated housing assembly can be adapted to multiple sets of rotary cutting and shearing units in parallel, forming approximately 20 m 3 The maximum processing capacity per unit per hour is [value missing]. Within this range, the present invention can achieve step-wise flow rate adaptation by matching the number of rotary shearing generator components; using room temperature clean water as the estimated baseline, the processing capacity decreases slightly (to 80%~90% of the original threshold) when processing corrosive or high-viscosity media. A single unit can also fine-tune the processing capacity within the range by adjusting the liquid phase inlet pressure from 0.5 to 2.0 MPa. If the operating conditions require more than 20 m [unit missing]... 3The processing capacity can be further expanded by connecting multiple units of this invention in parallel. Furthermore, by connecting the rotary shearing generator to the liquid phase guide hole and the rotary shearing gas phase guide section respectively, this invention can achieve a match between the liquid and gas volumes and the processing capacity of the rotary shearing generator, thereby achieving micro-nano bubble formation without relying on a pressurized gas source, while ensuring bubble quality. Furthermore, the combination of the tapered structure and the Venturi structure in this invention can increase the liquid flow rate and simultaneously generate a large negative pressure at the throat section, allowing the gas phase to quickly enter the throat section through the gas-liquid mixing hole. The gas phase guide channel is tangential to the spiral groove, generating a strong swirling flow during gas-liquid mixing. Under the shearing action of the strong swirling flow, small bubbles deform and tear, forming micro-nano bubbles, thereby enhancing gas-liquid mixing efficiency and reducing gas agglomeration. This invention achieves a balance between vortex shearing and fluid resistance control, reducing local head loss. Building upon the aforementioned primary cavitation effect, by setting the orifice diameter of the gas-liquid mixing hole to 0.6–0.8 times the outlet orifice diameter of the diffuser section, a Venturi structure is formed, causing a rapid increase in the gas-liquid mixture velocity. The annular cavitation groove within the gas-liquid mixing hole lowers the local pressure below the saturated vapor pressure, triggering a secondary cavitation effect. The micro-jet generated by cavitation and the shock wave simultaneously enhance the micro-nanoization process. Compared to traditional technologies, this invention does not rely on a pressurized gas source or bubble shearing device, reducing purchase costs and simplifying installation and maintenance. It features a reasonable structural design, allowing for flexible adjustment of the processing capacity while ensuring bubble quality, and also reduces energy consumption and maintenance costs. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the rotary cutting generator component of the present invention.

[0021] Figure 3 This is another schematic diagram of the rotary cutting generation component of the present invention.

[0022] Figure 4 This is a schematic diagram showing the positional relationship between the gas phase guiding channel and the throat section of the present invention.

[0023] Figure 5 This is an assembly diagram of the present invention.

[0024] In the image above: 1. Liquid inlet assembly; 2. Integrated housing assembly; 3. Rotary shearing generator assembly; 4. Neck section; 5. Diffusion section; 6. Throat section; 7. Gas-liquid mixture outlet; 8. Air inlet; 9. Flange structure; 10. Cylindrical structure; 11. Baffle plate; 12. Liquid phase guide hole; 13. Gradual narrowing structure; 14. Porous positioning plate; 15. Step; 16. Gas-liquid mixing hole; 17. Housing; 18. Gas phase guide channel; 19. Spiral groove. Detailed Implementation

[0025] 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.

[0026] Reference Figure 1-5This invention relates to a scalable micro / nano bubble generator and method. The device includes a liquid inlet assembly 1 and an integrated shell assembly 2. The liquid inlet assembly 1 is connected to the integrated shell assembly 2 via several rotary cutting generator assemblies 3. Each rotary cutting generator assembly 3 includes at least a necking section 4 connected to the liquid inlet assembly 1 and a diffusion section 5 connected to the gas-liquid mixture outlet 7 in the integrated shell assembly 2. A throat section 6 is provided between the necking section 4 and the diffusion section 5. An air inlet 8 is provided on the integrated shell assembly 2 corresponding to the throat section 6. A rotary cutting gas phase guide section is provided on the throat section 6 and communicates with the air inlet 8. This invention abandons the traditional method of mixing all liquid and gas phases and then using a bubble shearing device in conjunction with a gas source pressurization to generate micro-nano bubbles. Instead, it employs multiple rotary shearing generating components 3, each matched with the liquid phase in the liquid inlet component 1 and the gas phase in the gas inlet 8. This allows for flexible adjustment of the processing capacity by selecting the number of rotary shearing generating components 3 according to actual conditions while ensuring bubble quality. This method reduces purchase costs and energy consumption during the operation of bubble shearing devices, while also facilitating assembly. The integrated shell component 2 of this invention contains a cavity to accommodate the rotary shearing generating components 3. Furthermore, by setting the rotary shearing generating components 3, the matched liquid and gas phases can enter and be fully mixed inside, thus ensuring bubble quality. The liquid inlet assembly 1 and the integrated housing assembly 2 described in this invention can be connected by threads, nesting, or other methods. The rotary cutting generator assembly 3 and the liquid inlet assembly 1 can also be connected by threads, nesting, or other methods. During the connection process, sealing rings (preferably fluororubber sealing rings) can be used to ensure their sealing performance. The integrated housing assembly 2 and the rotary cutting generator assembly 3 described in this invention can be made of corrosion-resistant materials, and their surfaces are polished to a roughness Ra≤0.8 μm. The gas-liquid mixture outlet 7 described in this invention adopts a gradually expanding structure, with a preferred expansion angle of 10°~60°. It should be noted that the gas phase in the air inlet 8 described in this invention can be air or functional gases such as ozone.

[0027] Furthermore, the liquid inlet assembly 1 includes an outer flange structure 9, the inner side of which is an integrated cylindrical structure 10. A baffle plate 11 is provided at the bottom of the cylindrical structure 10, and several liquid phase guiding holes 12 are provided on the baffle plate 11. The liquid phase guiding holes 12 are connected to the inlet of the constricted section 4, and the several liquid phase guiding holes 12 are correspondingly arranged with the rotary shearing assembly 3. The flange structure 9 facilitates connection to the front-end liquid phase device. An external thread can be provided on the outer side of the cylindrical structure 10, and a threaded engagement is used between it and the corresponding internal thread in the integrated housing assembly 2. This invention, by providing the liquid phase guiding holes 12, can increase the liquid flow rate and match the liquid volume with the single rotary shearing assembly 3, thereby ensuring thorough mixing of the gas-liquid mixture.

[0028] Furthermore, the inner bottom of the cylindrical structure 10 and the baffle plate 11 form a tapered structure 13. The tapered structure 13 described in this invention can be a ramp or an arc surface, and the above-mentioned arrangement can achieve the characteristics of constraining fluid flow behavior and increasing fluid velocity.

[0029] Furthermore, a porous positioning plate 14 is provided between the plurality of rotary cutting generating components 3 and the integrated housing component 2 for positioning the rotary cutting generating components 3 and performing secondary cavitation; a step 15 is provided in the gas-liquid mixture outlet 7 of the integrated housing component 2 for limiting the porous positioning plate 14, and a plurality of gas-liquid mixing holes 16 are provided in the porous positioning plate 14. The gas-liquid mixing holes 16 are arranged in a one-to-one correspondence with the rotary cutting generating components 3, and the diameter of the gas-liquid mixing holes 16 is 0.6 to 0.8 times the diameter of the outlet hole of the diffuser section 5. The porous positioning plate 14 described in this invention can fix one side of the diffuser section 5 in the rotary shearing assembly 3. On the other hand, by making the diameter of the gas-liquid mixing hole 16 0.6 to 0.8 times the outlet diameter of the diffuser section 5, a Venturi structure is constructed to achieve secondary cavitation of the gas-liquid mixture. The micro-jet generated by cavitation and the shock wave are used to simultaneously enhance the micro- and nano-scale characteristics. The diffuser section 5 and the porous positioning plate 14 can be connected by threads, nesting, or other methods. A sealing ring can be set between them to ensure sealing. In addition, the porous positioning plate 14 can be made of corrosion-resistant material and the surface is polished to a roughness Ra≤0.8 μm. Furthermore, the rotary cutting generating assembly 3 also includes a housing 17, the two ends of which are connected to the liquid phase guiding hole 12 in the liquid inlet assembly 1 and the gas-liquid mixing hole 16 in the porous positioning plate 14, respectively. The rotary cutting gas phase guiding part includes at least one gas phase guiding channel 18 disposed between the throat section 6 and the aforementioned housing 17. The gas phase guiding channel 18 is tangent to the liquid channel of the throat section 6, and the included angle between the gas phase guiding channel 18 and the liquid channel of the throat section 6 is 30° to 90°. This angle design can ensure that the gas... The efficient inflow along the liquid flow direction ensures the speed and throughput of gas phase intake, effectively avoiding flow field disturbances and eddy current generation, maintaining the uniformity of liquid flow within the throat section 6, and providing a stable flow field foundation for the subsequent strong swirling shearing of the spiral groove 19; the diameter of the gas phase guiding channel 18 is 0.25 to 1 times the diameter of the throat section 6; the beneficial effect of the above configuration is that it allows for precise matching of gas flow rate and liquid flow rate of the swirling shearing component 3, achieving optimal control of the gas-liquid mixing ratio, improving the component's swirling shearing and crushing capability, and simultaneously maintaining the stability of the negative pressure flow field and liquid flow velocity in the throat section 6. The middle part of the outer shell 17 described in this invention can be cylindrical, square prism, or hexagonal prism, etc. The gas phase guiding channel 18 is connected to the throat section 6 of the swirling shearing component 3 in a tangential manner. The strong negative pressure of the throat section 6 can be utilized to allow the gas in the inlet 8 to enter the throat section 6 through the gas phase guiding channel 18 and form small bubbles.

[0030] Furthermore, when there are multiple gas phase guiding channels 18, the multiple gas phase guiding channels 18 are evenly distributed within the throat section 6, and the multiple gas phase guiding channels 18 and the liquid channel inlet of the throat section 6 are not on the same cross section. This arrangement can reduce the resistance of the gas phase entering the throat and merging with the liquid phase, thereby achieving a high energy utilization effect.

[0031] Furthermore, the swirling gas phase guide section also includes a spiral groove 19 disposed on the inner surface of the liquid channel in the throat section 6. The starting end of the spiral groove 19 is tangential to the gas phase guide channel 18 near the inlet of the throat section 6, and the end of the spiral groove 19 is disposed on the outlet side of the throat section 6. The spiral groove 19 in this invention, with its structural design, forms a flow field synergy with the gas phase guide channel 18, allowing tangentially injected gas to directly enter the swirling path of the groove. Compared to a direct flow path, this increases the residence time of the gas-liquid mixture. When the gas-liquid mixture passes through, it generates a directional strong swirling flow along the spiral groove 19, rather than a disordered vortex. Combined with the Venturi structure, this increases the flow velocity, enhances the gas-liquid mixing efficiency, and reduces gas agglomeration. Simultaneously, the spiral groove 19 is an integrally formed structure on its inner surface, which, compared to an external swirling component, does not increase fluid flow resistance, balancing the swirling and breaking effect with fluid resistance control, effectively reducing local head loss. This ensures that the device can maintain low energy consumption even under high swirling intensity, thereby improving the formation efficiency of micro- and nano-bubbles.

[0032] Furthermore, the spiral groove 19 comprises multiple spiral grooves, with multiple gas phase guiding channels 18 tangential to the front and middle portions of the spiral groove 19. This arrangement allows the gas phase to be uniformly dispersed into each swirling path, further improving the uniformity of gas-liquid mixing and reducing bubble agglomeration; simultaneously, it generates multiple independent swirling streams, enhancing the overall swirling shearing intensity within the throat section 6 and improving the shearing and breaking effect on bubbles. Furthermore, the spiral groove 19 is a U-shaped groove or an arc-shaped groove. The swirl angle of the spiral groove 19 is 15° to 75°, the lead of the spiral groove 19 is 2 to 15 times the diameter of the throat section 6, the depth of the spiral groove 19 is 0.05 to 0.1 times the diameter of the throat section 6, and the length of the throat section 6 is 2 to 15 times its diameter. The U-shaped or arc-shaped groove structure avoids dead zones and local eddies within the groove, ensuring smooth swirling motion of the gas-liquid mixture as it flows through the groove, reducing impact losses between the fluid and the groove wall. Simultaneously, the arc-shaped groove provides more uniform stress on its wall, improving the structural durability and service life of the groove. The swirl angle of the spiral groove 19 is limited to 15°–75°. This ensures that the gas-liquid mixture forms a sufficiently strong directional swirling flow, achieving effective deformation and tearing of bubbles through swirling shearing, while avoiding a surge in fluid resistance due to excessive swirling. This achieves low-energy operation while maintaining effective bubble breakage. The lead of the spiral groove 19 is designed to be 2–15 times the diameter of the throat section 6, allowing the gas-liquid mixture sufficient swirling shearing time within the throat section 6, ensuring the continuity of the swirling motion and more thorough bubble breakage. The depth of the spiral groove 19 is set to 0.05–0.1 times the diameter of the throat section 6, ensuring effective guidance of the fluid and forming a stable directional swirling flow. The length of the throat section 6, being 2–15 times the throat diameter, provides a longer residence time for the gas-liquid mixture, allowing for thorough mixing and improving breakage efficiency.

[0033] The present invention also provides a method for generating a scalable micro / nano bubble generator, the method comprising the following steps: Step 1: Select the number of rotary cutting generator components 3 to be used according to the actual working conditions, thereby determining which type of porous positioning plate 14 and liquid inlet component 1 to use; Connect the liquid phase guide hole 12 in the liquid inlet assembly 1 to the necking section 4 in the corresponding rotary cutting generator assembly 3. Then, place the rotary cutting generator assembly 3 inside the porous positioning plate 14, so that the diffusion section 5 of the rotary cutting generator assembly 3 is connected to the gas-liquid mixing hole 16 in the porous positioning plate 14. Finally, place the assembled liquid inlet assembly 1, rotary cutting generator assembly 3 and porous positioning plate 14 inside the step 15 of the integrated housing assembly 2, and fix the outside of the liquid inlet assembly 1 to the integrated housing assembly 2. The above structure is firmly connected and ensures that no leakage will occur when the sealing pressure is not less than 0.8 MPa. Step 2: The liquid to be processed increases its flow rate through the inlet assembly 1 under the action of the tapered structure 13, and through the liquid phase guide hole 12 to achieve the effect of further increasing the flow rate so that the amount of liquid entering the processing is matched with the processing capacity of the rotary shearing assembly 3. Step 3: The vortex generator 3 generates negative pressure through a venturi structure. The gas in the inlet 8 is drawn into the throat section 6 through the gas phase guide channel 18. The gas enters the liquid channel of the throat section 6 through the gas phase guide channel 18 and forms small bubbles. The gas phase guide channel 18 is tangential to the spiral groove 19 to generate strong vortex during the gas-liquid mixing process. The venturi structure is used to increase the flow rate, thereby enhancing the gas-liquid mixing efficiency, reducing bubble aggregation, and generating a primary cavitation effect. Furthermore, the aforementioned small bubbles deform and tear under strong swirling shearing action, forming micro-nano bubbles; Step 4: The diameter of the gas-liquid mixing hole 16 in the porous positioning plate 14 is smaller than the outlet diameter of the diffuser section 5 and the outlet diameter of the gas-liquid mixture 7, forming a Venturi structure; this Venturi structure can realize the secondary breakup of bubbles. When the local pressure in the annular cavitation groove in the gas-liquid mixing hole 16 is lower than the saturated vapor pressure, a secondary cavitation effect is triggered. The micro-jet generated by cavitation and the shock wave simultaneously enhance the micro-nanoization process. Step 5: After passing through the gas-liquid mixing hole 16 in step 4, the gas-liquid mixture decelerates after passing through the gradually expanding structure of the gas-liquid mixture outlet 7, and is stably output through the gas-liquid mixture outlet 7.

[0034] This invention belongs to the field of micro / nano bubble generation technology. Its core objective is to provide a scalable micro / nano bubble generation device and method, addressing the pain points of traditional devices such as limited processing capacity, difficulty in expansion, high energy consumption, and unbalanced application scenarios. The invention includes a liquid inlet assembly and an integrated shell assembly. The liquid inlet assembly is connected to the integrated shell assembly via several rotary cutting generation assemblies. The rotary cutting generation assembly serves as the smallest expansion unit, and the processing capacity of a single unit can be increased or decreased by adding or removing the number of assemblies, achieving a capacity of 1-20 m³ / s. 3The system features a stepped adjustment mechanism, allowing multiple units to be connected in parallel to exceed the upper limit, adapting to continuous operation requirements across all scenarios from small-scale trials to medium-to-large-scale industrial applications. This invention utilizes the venturi structure within the rotary shearing generator to create negative pressure suction. This, combined with tangentially positioned gas-phase guide channels and spiral grooves, forms a strong vortex, achieving primary cavitation and vortex shearing. A secondary venturi structure is then formed through the gas-liquid mixing holes of the porous positioning plate, initiating secondary cavitation. This dual-stage crushing process results in higher gas-liquid mixing efficiency, reducing bubble diameter to micro-nano levels and ensuring stable quality. It boasts a compact structure, small size, a sealing pressure of no less than 0.8 MPa, lower energy consumption than traditional devices, lower maintenance costs, replaceable components, and convenient installation. Completely breaking through the limitations of traditional models, it balances processing scale, operating costs, and bubble quality, making it widely applicable in water purification, aquaculture, and other fields.

[0035] Example 1 A scalable micro / nano bubble generator includes a liquid inlet assembly 1 and an integrated shell assembly 2. The liquid inlet assembly 1 is connected to the integrated shell assembly 2 via several rotary cutting generator assemblies 3. Each rotary cutting generator assembly 3 includes at least a necking section 4 connected to the liquid inlet assembly 1 and a diffusion section 5 connected to a gas-liquid mixture outlet 7 in the integrated shell assembly 2. A throat section 6 is provided between the necking section 4 and the diffusion section 5. An air inlet 8 is provided on the integrated shell assembly 2 corresponding to the throat section 6. A rotary cutting gas phase guide section is provided on the throat section 6 and communicates with the air inlet 8. The liquid inlet assembly 1 includes an outer flange structure 9. The inner side of the flange structure 9 is an integrated cylindrical structure 10. A baffle plate 11 is provided at the bottom of the cylindrical structure 10. Several liquid phase guide holes 12 are opened on the baffle plate 11. The liquid phase guide holes 12 are connected to the inlet of the necking section 4. The several liquid phase guide holes 12 are arranged in a one-to-one correspondence with the rotary cutting generator assemblies 3. The inner bottom of the cylindrical structure 10 and the baffle plate 11 are connected by a tapered structure 13. A porous positioning plate 14 is provided between the plurality of rotary shearing components 3 and the integrated shell assembly 2 for positioning the rotary shearing components 3 and performing secondary cavitation. The gas-liquid mixture outlet 7 of the integrated shell assembly 2 is provided with a step 15 for limiting the porous positioning plate 14. The porous positioning plate 14 is provided with a plurality of gas-liquid mixing holes 16, which are arranged in a one-to-one correspondence with the rotary shearing components 3. The diameter of the gas-liquid mixing holes 16 is 0.6 times the diameter of the outlet hole of the diffuser section 5. The rotary cutting generator assembly 3 also includes a housing 17. Both ends of the housing 17 are connected to the liquid phase guide hole 12 in the liquid inlet assembly 1 and the gas-liquid mixing hole 16 in the porous positioning plate 14, respectively. The rotary cutting gas phase guide section includes at least one gas phase guide channel 18 disposed between the throat section 6 and the aforementioned housing 17. The gas phase guide channel 18 is tangent to the liquid channel of the throat section 6, and the angle between the gas phase guide channel 18 and the liquid channel of the throat section 6 is 30°. The diameter of the gas phase guide channel 18 is 0.25 times the diameter of the throat section 6. The rotary cutting gas phase guide section also includes a spiral groove 19 disposed on the inner surface of the liquid channel in the throat section 6. The starting end of the spiral groove 19 is tangent to the gas phase guide channel 18 near the inlet of the throat section 6, and the end of the spiral groove 19 is disposed at the outlet of the throat section 6. The spiral groove 19 is a U-shaped groove with a swirl angle of 15°. The lead of the spiral groove 19 is twice the diameter of the throat section 6. The depth of the spiral groove 19 is 0.05 times the diameter of the throat section 6. The length of the throat section 6 is twice the diameter of the throat section 6.

[0036] A method for generating a scalable micro / nano bubble device, the method comprising the following steps: Step 1: Select the number of rotary cutting generator components 3 to be used based on the actual working conditions, thereby determining which type of porous positioning plate 14 and liquid inlet component 1 to use; connect the liquid phase guide hole 12 in the liquid inlet component 1 to the necking section 4 in the corresponding rotary cutting generator component 3, and then place the rotary cutting generator component 3 on the inner side of the porous positioning plate 14, so that the diffusion section 5 of the rotary cutting generator component 3 is connected to the gas-liquid mixing hole 16 in the porous positioning plate 14; finally, place the assembled liquid inlet component 1, rotary cutting generator component 3 and porous positioning plate 14 on the inner side of the step 15 of the integrated housing component 2, and fix the outside of the liquid inlet component 1 to the integrated housing component 2; the above structure is firmly connected and ensures that no leakage occurs when the sealing pressure is not less than 0.8 MPa; Step 2: The liquid to be processed increases its flow rate through the inlet assembly 1 under the action of the tapered structure 13, and through the liquid phase guide hole 12 to achieve the effect of further increasing the flow rate so that the amount of liquid entering the processing is matched with the processing capacity of the rotary shearing assembly 3. Step 3: The vortex generator 3 generates negative pressure through a venturi structure. The gas in the inlet 8 is drawn into the throat section 6 through the gas phase guide channel 18. The gas enters the liquid channel of the throat section 6 through the gas phase guide channel 18 and forms small bubbles. The gas phase guide channel 18 is tangential to the spiral groove 19 to generate strong vortex during the gas-liquid mixing process. The venturi structure is used to increase the flow rate, thereby enhancing the gas-liquid mixing efficiency, reducing bubble aggregation, and generating a primary cavitation effect. Furthermore, the aforementioned small bubbles deform and tear under strong swirling shearing action, forming micro-nano bubbles; Step 4: The diameter of the gas-liquid mixing hole 16 in the porous positioning plate 14 is smaller than the outlet diameter of the diffuser section 5 and the outlet diameter of the gas-liquid mixture 7, forming a Venturi structure; this Venturi structure can realize the secondary breakup of bubbles. When the local pressure in the annular cavitation groove in the gas-liquid mixing hole 16 is lower than the saturated vapor pressure, a secondary cavitation effect is triggered. The micro-jet generated by cavitation and the shock wave simultaneously enhance the micro-nanoization process. Step 5: After passing through the gas-liquid mixing hole 16 in step 4, the gas-liquid mixture decelerates after passing through the gradually expanding structure of the gas-liquid mixture outlet 7, and is stably output through the gas-liquid mixture outlet 7.

[0037] Example 2 A scalable micro / nano bubble generator includes a liquid inlet assembly 1 and an integrated shell assembly 2. The liquid inlet assembly 1 is connected to the integrated shell assembly 2 via several rotary cutting generator assemblies 3. Each rotary cutting generator assembly 3 includes at least a necking section 4 connected to the liquid inlet assembly 1 and a diffusion section 5 connected to a gas-liquid mixture outlet 7 in the integrated shell assembly 2. A throat section 6 is provided between the necking section 4 and the diffusion section 5. An air inlet 8 is provided on the integrated shell assembly 2 corresponding to the throat section 6. A rotary cutting gas phase guide section is provided on the throat section 6 and communicates with the air inlet 8. The liquid inlet assembly 1 includes an outer flange structure 9. The inner side of the flange structure 9 is an integrated cylindrical structure 10. A baffle plate 11 is provided at the bottom of the cylindrical structure 10. Several liquid phase guide holes 12 are opened on the baffle plate 11. The liquid phase guide holes 12 are connected to the inlet of the necking section 4. The several liquid phase guide holes 12 are arranged in a one-to-one correspondence with the rotary cutting generator assemblies 3. The inner bottom of the cylindrical structure 10 and the baffle plate 11 are connected by a tapered structure 13. A porous positioning plate 14 is provided between the plurality of rotary cutting generating components 3 and the integrated shell assembly 2 for positioning the rotary cutting generating components 3 and performing secondary cavitation. The gas-liquid mixture outlet 7 of the integrated shell assembly 2 is provided with a step 15 for limiting the porous positioning plate 14. The porous positioning plate 14 is provided with a plurality of gas-liquid mixing holes 16, which are arranged in a one-to-one correspondence with the rotary cutting generating components 3. The diameter of the gas-liquid mixing hole 16 is 0.8 times the diameter of the outlet hole of the diffuser section 5. The rotary cutting generator assembly 3 also includes a housing 17. Both ends of the housing 17 are connected to the liquid phase guide hole 12 in the liquid inlet assembly 1 and the gas-liquid mixing hole 16 in the porous positioning plate 14, respectively. The rotary cutting gas phase guide section includes at least a gas phase guide channel 18 disposed between the throat section 6 and the aforementioned housing 17. The gas phase guide channel 18 is tangent to the liquid channel of the throat section 6, and the included angle between the gas phase guide channel 18 and the liquid channel of the throat section 6 is 90°. The diameter of the gas phase guide channel 18 is one time the diameter of the throat section 6. When there are multiple gas phase guide channels 18, the multiple gas phase guide channels 18 are evenly distributed within the throat section 6, and the multiple gas phase guide channels 18 and the liquid channel inlet of the throat section 6 are not on the same cross-section. The rotary gas phase guide section also includes a spiral groove 19 disposed on the inner surface of the liquid channel in the throat section 6. The starting end of the spiral groove 19 is tangent to the gas phase guide channel 18 near the inlet of the throat section 6, and the end of the spiral groove 19 is disposed on the outlet side of the throat section 6. The spiral groove 19 is an arc-shaped groove with a swirl angle of 75°, a lead of 15 times the diameter of the throat section 6, a depth of 0.1 times the diameter of the throat section 6, and a length of 15 times the diameter of the throat section 6.

[0038] A method for generating a scalable micro / nano bubble device, the method comprising the following steps: Step 1: Select the number of rotary cutting generator components 3 to be used according to the actual working conditions, thereby determining which type of porous positioning plate 14 and liquid inlet component 1 to use; Connect the liquid phase guide hole 12 in the liquid inlet assembly 1 to the necking section 4 in the corresponding rotary cutting generator assembly 3. Then, place the rotary cutting generator assembly 3 inside the porous positioning plate 14, so that the diffusion section 5 of the rotary cutting generator assembly 3 is connected to the gas-liquid mixing hole 16 in the porous positioning plate 14. Finally, place the assembled liquid inlet assembly 1, rotary cutting generator assembly 3 and porous positioning plate 14 inside the step 15 of the integrated housing assembly 2, and fix the outside of the liquid inlet assembly 1 to the integrated housing assembly 2. The above structure is firmly connected and ensures that no leakage will occur when the sealing pressure is not less than 0.8 MPa. Step 2: The liquid to be processed increases its flow rate through the inlet assembly 1 under the action of the tapered structure 13, and through the liquid phase guide hole 12 to achieve the effect of further increasing the flow rate so that the amount of liquid entering the processing is matched with the processing capacity of the rotary shearing assembly 3. Step 3: The vortex generator 3 generates negative pressure through a venturi structure. The gas in the inlet 8 is drawn into the throat section 6 through the gas phase guide channel 18. The gas enters the liquid channel of the throat section 6 through the gas phase guide channel 18 and forms small bubbles. The gas phase guide channel 16 is tangential to the spiral groove 19 to generate strong vortex during the gas-liquid mixing process. The venturi structure is used to increase the flow rate, thereby enhancing the gas-liquid mixing efficiency, reducing bubble aggregation, and generating a primary cavitation effect. Furthermore, the aforementioned small bubbles deform and tear under strong swirling shearing action, forming micro-nano bubbles; Step 4: The diameter of the gas-liquid mixing hole 16 in the porous positioning plate 14 is smaller than the outlet diameter of the diffuser section 5 and the outlet diameter of the gas-liquid mixture 7, forming a Venturi structure; this Venturi structure can realize the secondary breakup of bubbles. When the local pressure in the annular cavitation groove in the gas-liquid mixing hole 16 is lower than the saturated vapor pressure, a secondary cavitation effect is triggered. The micro-jet generated by cavitation and the shock wave simultaneously enhance the micro-nanoization process. Step 5: After passing through the gas-liquid mixing hole 16 in step 4, the gas-liquid mixture decelerates after passing through the gradually expanding structure of the gas-liquid mixture outlet 7, and is stably output through the gas-liquid mixture outlet 7.

[0039] Example 3 A scalable micro / nano bubble generator includes a liquid inlet assembly 1 and an integrated shell assembly 2. The liquid inlet assembly 1 is connected to the integrated shell assembly 2 via several rotary cutting generator assemblies 3. Each rotary cutting generator assembly 3 includes at least a necking section 4 connected to the liquid inlet assembly 1 and a diffusion section 5 connected to a gas-liquid mixture outlet 7 in the integrated shell assembly 2. A throat section 6 is provided between the necking section 4 and the diffusion section 5. An air inlet 8 is provided on the integrated shell assembly 2 corresponding to the throat section 6. A rotary cutting gas phase guide section is provided on the throat section 6 and communicates with the air inlet 8. The liquid inlet assembly 1 includes an outer flange structure 9. The inner side of the flange structure 9 is an integrated cylindrical structure 10. A baffle plate 11 is provided at the bottom of the cylindrical structure 10. Several liquid phase guide holes 12 are opened on the baffle plate 11. The liquid phase guide holes 12 are connected to the inlet of the necking section 4. The several liquid phase guide holes 12 are arranged in a one-to-one correspondence with the rotary cutting generator assemblies 3. The inner bottom of the cylindrical structure 10 and the baffle plate 11 are connected by a tapered structure 13. A porous positioning plate 14 is provided between the plurality of rotary cutting generating components 3 and the integrated shell assembly 2 for positioning the rotary cutting generating components 3 and performing secondary cavitation. The gas-liquid mixture outlet 7 of the integrated shell assembly 2 is provided with a step 15 for limiting the porous positioning plate 14. The porous positioning plate 14 is provided with a plurality of gas-liquid mixing holes 16, which are arranged in a one-to-one correspondence with the rotary cutting generating components 3. The diameter of the gas-liquid mixing hole 16 is 0.7 times the diameter of the outlet hole of the diffuser section 5. The rotary cutting generator assembly 3 also includes a housing 17. Both ends of the housing 17 are connected to the liquid phase guide hole 12 in the liquid inlet assembly 1 and the gas-liquid mixing hole 16 in the porous positioning plate 14, respectively. The rotary cutting gas phase guide section includes at least a gas phase guide channel 18 disposed between the throat section 6 and the aforementioned housing 17. The gas phase guide channel 18 is tangent to the liquid channel of the throat section 6, and the angle between the gas phase guide channel 18 and the liquid channel of the throat section 6 is 60°. The diameter of the gas phase guide channel 18 is 0.65 times the diameter of the throat section 6. When there are multiple gas phase guide channels 18, the multiple gas phase guide channels 18 are evenly distributed within the throat section 6, and the multiple gas phase guide channels 18 and the liquid channel inlets of the throat section 6 are not on the same cross-section. The swirling gas phase guide section also includes a spiral groove 19 disposed on the inner surface of the liquid channel in the throat section 6. The starting end of the spiral groove 19 is tangent to the gas phase guide channel 18 near the inlet of the throat section 6, and the end of the spiral groove 19 is disposed on the outlet side of the throat section 6. There are multiple spiral grooves 19, and multiple gas phase guide channels 18 are tangent to the front and middle parts of the spiral grooves 19. The spiral groove 19 is a U-shaped groove with a swirl angle of 45°, a lead of 8 times the diameter of the throat section 6, a depth of 0.07 times the diameter of the throat section 6, and a length of 7 times the diameter of the throat section 6.

[0040] A method for generating a scalable micro / nano bubble device, the method comprising the following steps: Step 1: Select the number of rotary cutting generator components 3 to be used according to the actual working conditions, thereby determining which type of porous positioning plate 14 and liquid inlet component 1 to use; Connect the liquid phase guide hole 12 in the liquid inlet assembly 1 to the necking section 4 in the corresponding rotary cutting generator assembly 3. Then, place the rotary cutting generator assembly 3 inside the porous positioning plate 14, so that the diffusion section 5 of the rotary cutting generator assembly 3 is connected to the gas-liquid mixing hole 16 in the porous positioning plate 14. Finally, place the assembled liquid inlet assembly 1, rotary cutting generator assembly 3 and porous positioning plate 14 inside the step 15 of the integrated housing assembly 2, and fix the outside of the liquid inlet assembly 1 to the integrated housing assembly 2. The above structure is firmly connected and ensures that no leakage will occur when the sealing pressure is not less than 0.8 MPa. Step 2: The liquid to be processed increases its flow rate through the inlet assembly 1 under the action of the tapered structure 13, and through the liquid phase guide hole 12 to achieve the effect of further increasing the flow rate so that the amount of liquid entering the processing is matched with the processing capacity of the rotary shearing assembly 3. Step 3: The vortex generator 3 generates negative pressure through a venturi structure. The gas in the inlet 8 is drawn into the throat section 6 through the gas phase guide channel 18. The gas enters the liquid channel of the throat section 6 through the gas phase guide channel 18 and forms small bubbles. The gas phase guide channel 18 is tangential to the spiral groove 19 to generate strong vortex during the gas-liquid mixing process. The venturi structure is used to increase the flow rate, thereby enhancing the gas-liquid mixing efficiency, reducing bubble aggregation, and generating a primary cavitation effect. Furthermore, the aforementioned small bubbles deform and tear under strong swirling shearing action, forming micro-nano bubbles; Step 4: The diameter of the gas-liquid mixing hole 16 in the porous positioning plate 14 is smaller than the outlet diameter of the diffuser section 5 and the outlet diameter of the gas-liquid mixture 7, forming a Venturi structure; this Venturi structure can realize the secondary breakup of bubbles. When the local pressure in the annular cavitation groove in the gas-liquid mixing hole 16 is lower than the saturated vapor pressure, a secondary cavitation effect is triggered. The micro-jet generated by cavitation and the shock wave simultaneously enhance the micro-nanoization process. Step 5: After passing through the gas-liquid mixing hole 16 in step 4, the gas-liquid mixture decelerates after passing through the gradually expanding structure of the gas-liquid mixture outlet 7, and is stably output through the gas-liquid mixture outlet 7.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A scalable micro / nano bubble generator, characterized in that: The device includes an inlet assembly (1) and an integrated housing assembly (2). The liquid inlet assembly (1) is connected to the integrated housing assembly (2) via several rotary cutting generating assemblies (3). The rotary cutting generator assembly (3) includes at least a constricted section (4) connected to the liquid inlet assembly (1), a diffuser section (5) connected to the gas-liquid mixture outlet (7) in the integrated housing assembly (2), a throat section (6) between the constricted section (4) and the diffuser section (5), and an air inlet (8) on the integrated housing assembly (2) corresponding to the throat section (6); a rotary cutting gas phase guide section connected to the air inlet (8) is provided on the throat section (6).

2. The scalable micro / nano bubble generator according to claim 1, characterized in that: The liquid inlet assembly (1) includes an outer flange structure (9), the inner side of which is an integrated cylindrical structure (10). The inner bottom of the cylindrical structure (10) is provided with a baffle plate (11), and the baffle plate (11) is provided with several liquid phase guide holes (12). The liquid phase guide holes (12) are connected to the inlet of the constricted section (4), and the several liquid phase guide holes (12) are provided in a one-to-one correspondence with the rotary cutting generator assembly (3).

3. The scalable micro / nano bubble generator according to claim 2, characterized in that: The inner bottom of the cylindrical structure (10) and the baffle (11) are a tapered structure (13).

4. A scalable micro / nano bubble generator according to claim 1, characterized in that: A porous positioning plate (14) is provided between the plurality of rotary cutting generating components (3) and the integrated housing assembly (2) for positioning the rotary cutting generating components (3) and performing secondary cavitation. The gas-liquid mixture outlet (7) of the integrated housing assembly (2) is provided with a step (15) for limiting the porous positioning plate (14). The porous positioning plate (14) is provided with a number of gas-liquid mixing holes (16). The gas-liquid mixing holes (16) are provided in a one-to-one correspondence with the rotary cutting generator assembly (3). The diameter of the gas-liquid mixing holes (16) is 0.6 to 0.8 times the diameter of the outlet hole of the diffusion section (5).

5. A scalable micro / nano bubble generator according to claim 4, characterized in that: The rotary cutting generator assembly (3) also includes a housing (17), the two ends of which are connected to the liquid phase guide hole (12) in the liquid inlet assembly (1) and the gas-liquid mixing hole (16) in the porous positioning plate (14), respectively. The rotary gas phase guide section includes at least one gas phase guide channel (18) disposed between the throat section (6) and the aforementioned outer shell (17). The gas phase guide channel (18) is tangent to the liquid channel of the throat section (6). The included angle between the gas phase guide channel (18) and the liquid channel of the throat section (6) is 30° to 90°. The diameter of the gas phase guide channel (18) is 0.25 to 1 times the diameter of the throat section (6).

6. A scalable micro / nano bubble generator according to claim 5, characterized in that: When there are multiple gas phase guiding channels (18), the multiple gas phase guiding channels (18) are evenly distributed in the throat section (6), and the multiple gas phase guiding channels (18) and the liquid channel inlet of the throat section (6) are not on the same cross section.

7. A scalable micro / nano bubble generator according to claim 6, characterized in that: The rotary gas phase guide section also includes a spiral groove (19) disposed on the inner surface of the liquid channel in the throat section (6). The starting end of the spiral groove (19) is tangent to the gas phase guide channel (18) on the side near the inlet of the throat section (6), and the end of the spiral groove (19) is disposed on the side at the outlet of the throat section (6).

8. A scalable micro / nano bubble generator according to claim 7, characterized in that: The spiral groove (19) consists of multiple spiral grooves, and multiple gas phase guiding channels (18) are tangent to the front and middle parts of the spiral groove (19).

9. A scalable micro / nano bubble generator according to claim 7 or 8, characterized in that: The spiral groove (19) is a U-shaped groove or an arc-shaped groove. The swirl angle of the spiral groove (19) is 15° to 75°. The lead of the spiral groove (19) is 2 to 15 times the diameter of the throat section (6). The depth of the spiral groove (19) is 0.05 to 0.1 times the diameter of the throat section (6). The length of the throat section (6) is 2 to 15 times the diameter of the throat section (6).

10. A method for generating micro / nano bubbles using a scalable micro / nano bubble generator, characterized in that: The method includes the following steps: Step 1: Select the number of rotary cutting generator components (3) to be used according to the actual working conditions, thereby determining which type of porous positioning plate (14) and liquid inlet end component (1) to use. Connect the liquid phase guide hole (12) in the liquid inlet assembly (1) to the necking section (4) in the corresponding rotary cutting generator assembly (3), and then place the rotary cutting generator assembly (3) inside the porous positioning plate (14), so that the diffusion section (5) of the rotary cutting generator assembly (3) is connected to the gas-liquid mixing hole (16) in the porous positioning plate (14). Finally, place the assembled liquid inlet assembly (1), rotary cutting generator assembly (3) and porous positioning plate (14) inside the step (15) of the integrated housing assembly (2), and fix the outside of the liquid inlet assembly (1) to the integrated housing assembly (2). The above structure is firmly connected and ensures that no leakage occurs when the sealing pressure is not less than 0.8 MPa. Step 2: The liquid to be processed increases its flow rate through the inlet assembly (1) under the action of the tapered structure (13), and through the liquid phase guide hole (12) to achieve the effect of further increasing the flow rate so that the amount of liquid entering the processing is matched with the processing capacity of the rotary shearing assembly (3). Step 3: The vortex generator assembly (3) generates negative pressure through a venturi structure. The gas in the inlet (8) is drawn into the throat section (6) through the gas phase guide channel (18). The gas enters the liquid channel of the throat section (6) through the gas phase guide channel (18) to form small bubbles. The gas phase guide channel (18) is tangent to the spiral groove (19) to generate strong vortex during the gas-liquid mixing process. The venturi structure is used to increase the flow rate, thereby enhancing the gas-liquid mixing efficiency, reducing bubble aggregation, and generating a primary cavitation effect. Furthermore, the aforementioned small bubbles deform and tear under strong swirling shearing action, forming micro-nano bubbles; Step 4: The diameter of the gas-liquid mixing hole (16) in the porous positioning plate (14) is smaller than the outlet hole diameter of the diffuser section (5) and the outlet hole diameter of the gas-liquid mixture (7), forming a Venturi structure; the Venturi structure can realize the secondary breakup of bubbles. When the local pressure in the annular cavitation groove in the gas-liquid mixing hole (16) is lower than the saturated vapor pressure, a secondary cavitation effect is triggered. The micro-jet generated by cavitation and the shock wave simultaneously enhance the micro-nanoization process; Step 5: After passing through the gas-liquid mixing hole (16) in step 4, the gas-liquid mixture decelerates after passing through the gradually expanding structure of the gas-liquid mixture outlet (7) and is stably output through the gas-liquid mixture outlet (7).

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