Enhanced aeration cavitation generation device and working method

Abstract

The invention discloses an enhanced aeration cavitation generation device and a working method. An outlet of a mechanical aeration system is connected with a cavitation nozzle which is arranged in a water tank through a pipeline, a driving motor is connected with a driving wheel, a first driven wheel is coaxially and fixedly sleeved on a hollow inner main shaft, a second driven wheel is coaxially and fixedly sleeved on a hollow outer main shaft, and the driven wheel is connected with the driven wheel; the outer main shaft and the inner main shaft upwards penetrate through the closed air injection space of the air injection device and extend into the closed cavitation space of the mechanical aeration system; three horizontal lower supports and three horizontal upper supports are evenly arranged at the upper end of the outer main shaft and the upper end of the inner main shaft in the closed cavitation space, the upper surface of each lower support is vertically and fixedly connected with two lower support wings upwards, the lower surface of each upper support is vertically and fixedly connected with two upper support wings downwards, and micron-sized through holes are formed in the side walls of the outer main shaft and the inner main shaft in the closed air injection space. The upper and lower brackets and the upper and lower bracket wings are of hollow structures and are provided with exhaust holes; the closed cavitation space is filled with liquid, the support and the support wings rotate reversely at the same time, and the cavitation intensity is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of cavitation effect, in particular to a cavitation generating device which uses water as a medium and uses a submerged cavitation nozzle to enhance the aeration cavitation effect. Background Art

[0002] As a new and efficient technology, cavitation technology is widely used in the fields of chemical industry, environmental treatment, bioengineering, food industry and pharmaceutical preparation. By reducing the pressure inside the fluid below the saturated vapor pressure, steam bubbles or gas-filled cavitation can be generated. The high energy generated by the collapse of the bubbles when the pressure increases can be used as the input energy of chemical reactions and the main energy source for water resource purification. At the same time, thanks to the relatively simple implementation form and high energy utilization rate of hydraulic cavitation, it provides an efficient and environmentally friendly practical solution for the practical application of cavitation technology and the reuse of hydraulic resources. As a key factor in determining the cavitation intensity, cavitation generators have been widely studied and used in industrial production. According to their different structures, they can be divided into two categories: non-rotating hydraulic cavitation generators and rotary hydraulic cavitation generators. Although these two types of cavitation generators are widely used, they still have the following defects: non-rotating hydraulic cavitation generators have large pressure loss, low mass transfer efficiency, and uncontrollable cavitation intensity; rotary hydraulic cavitation generators have rotating parts that are easy to wear and unstable cavitation intensity.

[0003] The Chinese patent publication number CN113105038B, entitled "A device for strengthening photocatalytic removal of microalgae by coupling hydrodynamic cavitation with micro-nano aeration", proposes a hydrodynamic cavitation coupling device, which includes a hydrodynamic cavitation generating device, a micro-nano aeration device and a photocatalytic guide tube. The hydrodynamic cavitation generating device is used to form a cavitation effect in the algae-containing water body, break the microalgae cells and preliminarily oxidize them. The micro-nano aeration device is used to add air to the water body and form micro-nano bubbles to provide active oxygen for subsequent photocatalysis; the photocatalytic guide tube is used for the collision of the broken cells after cavitation with the micro-nano bubbles to improve the mass transfer efficiency and further deepen the photocatalytic oxidation. However, the problem is that the cavitation bubbles generated by the cavitation device will collapse prematurely in the process of entering the guide tube due to the lack of measures to reduce the pressure, resulting in a small number of cavitation bubbles, thereby reducing the cavitation intensity and resulting in unsatisfactory effect. The Chinese patent publication number CN110354706B, entitled "A combined cavitator that can be adjusted online", proposes a cavitator, which is composed of an integrated large and small cylinder body, the ports of the cylinder body are covered with left and right end covers respectively, the small cylinder body is connected to the fluid inlet, the large cylinder body is connected to the fluid outlet, the left side of the inlet is connected to the combined jet body, and is fixed by the combined jet body connecting convex ring, the inner wall of the center hole of the small cylinder body is provided with a slip ring, the right side of the slip ring is provided with a cut-off ring, the inner wall of the cut-off ring is provided with an inner cone of the cut-off ring, and an annular gap channel is formed between the inner cone of the cut-off ring and the outer cone of the jet body, and the combined jet body is provided with a center hole and an end face jet hole. However, the problem is that the gap between the large and small cylinder bodies is large, and this part of the liquid will be discharged without cavitation, thereby reducing the actual cavitation area and the low pressure area is small. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems existing in the prior art. Aiming at a series of problems existing in the traditional hydraulic cavitation generating device, such as small low pressure area, small number of cavitation bubbles and unevenness, a new enhanced aeration cavitation generating device and its working method are proposed to enhance the cavitation intensity.

[0005] To achieve the above-mentioned purpose, the enhanced aeration cavitation generating device of the present invention is realized by the following technical scheme: the water tank outlet is connected to the inlet of the mechanical aeration system through a return pipe, the mechanical aeration system includes a closed cavitation space formed by an upper box body and a lower box body, the top of the upper box body is provided with a mechanical aeration system outlet, the mechanical aeration system outlet is connected to the cavitation nozzle submerged in the water tank through a pipe, and the inlets of the mechanical aeration system are provided on both sides of the lower box body; an air injection device, a reduction box and a driving motor are arranged below the lower box body, and three bevel gears, a driving wheel, a driven wheel 1 and a driven wheel 2, are arranged in the reduction box, the output shaft of the driving motor is coaxially fixedly connected to the driving wheel, the driven wheel 1 and the driven wheel 2 are arranged in parallel one below and one above and are both meshed with the driving wheel, the driven wheel is coaxially fixedly sleeved on the inner main shaft, and the driven wheel 2 is coaxially fixedly sleeved on the outer main shaft; the air injection device has a closed air injection space, and high-pressure air is injected into the closed air injection space; the inner main shaft coaxially passes through the outer main shaft, and the outer diameter of the inner main shaft is smaller than the inner diameter of the outer main shaft diameter, there is a radial gap between them, the outer main shaft and the inner main shaft pass through the closed air injection space upward and extend into the closed cavitation space and are sealed to connect the air injection device and the mechanical aeration system; three horizontal lower brackets are evenly arranged along the circumferential direction at the upper end of the outer main shaft inside the closed cavitation space, and the upper surface of each lower bracket is vertically fixedly connected to two lower bracket wings; three horizontal upper brackets are evenly arranged along the circumferential direction at the upper end of the inner main shaft inside the closed cavitation space, and the lower surface of each upper bracket is vertically fixedly connected to two upper bracket wings downward, and the upper bracket wings are staggered; the outer main shaft and the inner main shaft are both hollow shafts, and a number of micron-level through holes are provided on the side walls of the outer main shaft and the inner main shaft in the closed air injection space; the lower bracket, the upper bracket, the lower bracket wing and the upper bracket wing are all hollow structures and are provided with exhaust holes on the surface; a bracket wing adjustment device that can drive the upper bracket wing to rotate is provided on the upper surface of each upper bracket.

[0006] Furthermore, the bracket wing adjustment device is composed of a rotating motor, a worm, a connecting rod, a worm wheel, a bearing, a baffle and a bracket wing adjustment device cover. The two worms are coaxially connected by a connecting rod, and the output shaft of the rotating motor drives the two worms. A worm and a worm wheel are meshed. The baffle is a rotating body structure. The worm wheel and the upper half of the baffle are connected by a key. The middle part of the baffle is processed with a through hole and is connected to the upper bracket through a bearing. The lower half of the baffle fits tightly against the upper bracket wing below the upper bracket.

[0007] The working method of the enhanced aeration cavitation generating device of the present invention is realized by the following technical scheme:

[0008] The closed cavitation space of the mechanical aeration system is filled with liquid, and the drive motor and air injection device work simultaneously;

[0009] The driven wheel 1 and the driven wheel rotate in the opposite direction, and the outer main shaft drives the connected lower bracket and the lower bracket wing, and the inner main shaft drives the connected upper bracket and the upper bracket wing to rotate in the opposite direction at the same time, forming a high-speed gas-liquid two-phase flow;

[0010] High-pressure air enters through the micron-sized through holes on the outer spindle and the inner spindle, and is discharged through the exhaust holes on the lower bracket, the upper bracket, the lower bracket wing and the upper bracket wing, and the liquid and the cavitation bubbles are mixed in the closed cavitation space.

[0011] Furthermore, the support wing adjustment device works to make the six upper support wings rotate simultaneously in the vertical direction to change the cavitation intensity.

[0012] Compared with the prior art, the present invention has the following outstanding beneficial effects:

[0013] (1) The present invention installs the mechanical aeration system vertically upward, and the top of the upper box is conical. The air buoyancy of the cavitation bubbles of mechanical aeration is used to realize more concentrated cavitation outflow with high-pressure water at the top outlet, thereby ensuring the gas outlet efficiency. The high-speed rotating main shaft drives the bracket and the bracket wing structure to generate a low-pressure area, perform mechanical aeration and uniform cavitation, and assist cavitation generation through the mechanical aeration system. Finally, the gas-liquid two-phase flow is transported into the cavitation jet nozzle to achieve the purpose of enhancing the cavitation intensity.

[0014] (2) In the present invention, cavitation is initiated when the pressure is lower than the saturated vapor pressure, and the generated cavitation bubbles will actively pass through the top outlet of the upper box under the action of their own air buoyancy, thus avoiding uneven accumulation of cavitation bubbles. The conical top of the upper box also improves the gas outlet efficiency. Ultimately, the cavitation discharge efficiency and cavitation cycle speed are improved, thereby achieving an increase in cavitation intensity.

[0015] (3) The present invention realizes the coaxial counter-rotation of two groups of brackets through three mutually meshing bevel gears in the reduction box, forming a relatively symmetrical water flow and increasing the cavitation effect through vortexes. After cavitation is generated inside the mechanical aeration system, a low-pressure area is generated by the coaxial counter-rotating bracket wing structure, which prevents the cavitation from growing. A large number of small cavitations are sprayed into the water tank along with the liquid from the cavitation nozzle connected to the outlet of the upper box. The two coaxial bevel gears in the reduction box are respectively connected to the hollow shafts, and the connected hollow shafts are concentric. Each hollow shaft is welded and connected to three brackets, and two bracket wings are connected under each bracket, and the bracket wings are staggered. The driving wheel in the reduction box is coaxially fixedly connected to the driving motor. The motor drives the coaxial bevel gears to realize the reverse rotation of the main shaft, drive the bracket wings on the bracket to move, cause vortexes in the liquid, and enhance the stirring effect of the liquid. When the double brackets rotate in opposite directions, the liquid has a higher collision speed driven by them. According to Bernoulli's principle, the pressure here is lower. The increase in low-pressure areas is conducive to the uniform integration of cavitation bubbles into the liquid. Cavitation initiation occurs when the pressure is lower than the saturated vapor pressure, further improving the cavitation intensity.

[0016] (4) The present invention realizes more stirring effects and low-pressure zones by orderly combining the bracket wings connected by the brackets. The bracket wings will generate a low-pressure zone at the top and a high-pressure zone at the bottom. Because the bracket wings are composed of the parts of the two original bracket wings that generate low-pressure zones, low-pressure zones can be generated on both sides during high-speed rotation. The bracket wings between the two groups of brackets are arranged in an interlaced manner facing each other, and multiple low-pressure zones will be formed during the reverse rotation of the brackets. At the same time, the double brackets can more effectively generate centrifugal force during the reverse rotation, thereby enhancing the centrifugal effect of the liquid. The micron bubbles injected into the main shaft by the air injection device are discharged and grown in this low-pressure zone. Through this structure, the problem of uneven bubble distribution in traditional cavitation generators is solved. In addition, the generated low-pressure zone further improves the utilization rate of the cavitation area and expands the range of the cavitation area.

[0017] (5) The support wing of the present invention can adjust the angle to change the area of ​​the low pressure zone, thereby affecting the generation of cavitation bubbles and achieving the purpose of adjusting the cavitation intensity. A rotating motor is provided at the top of the main shaft, and the motor controls the tilt angle of the upper support wing through three control rods. When the lower support wing remains unchanged, the area of ​​the low pressure zone can be changed to achieve the control of the cavitation intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 It is a schematic diagram of the overall structural connection of an enhanced aeration cavitation generating device of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of the structure of the mechanical aeration system;

[0021] Figure 3 yes Figure 2 A partial enlarged view of the bulge on the inner wall of the mechanical aeration system;

[0022] Figure 4 yes Figure 2 A magnified view of the structure of the inner wall of the mechanical aeration system;

[0023] Figure 5 yes Figure 2 A magnified view of the structure of the air injection device;

[0024] Figure 6 yes Figure 2 A magnified view of the structure of the middle bracket and bracket wings;

[0025] Figure 7 yes Figure 6 Main structural section view.

[0026] Explanation of reference numerals: 1. water tank; 2. filter; 3. high pressure pump; 4. pressure regulating valve; 5. pressure sensor; 6. PLC central controller; 7. vortex flowmeter; 8. control computer; 9. mechanical aeration system; 10. air injection device; 11. reduction box; 12. drive motor; 13. cavitation nozzle and its connecting pipe; 14. support frame; 15-1. upper box body; 15-2. lower box body; 16. protrusion on the inner wall of the box body; 17. pressure sensor; 18. bearing of mechanical aeration system; 19. outer spindle; 20. inner spindle; 21-1. driven wheel 1; 21-2. driving wheel; 21-3. driven wheel 2; 22-1. lower bracket; 22-2. upper bracket; 2 3-1. Lower bracket wing; 23-2. Upper bracket wing; 24. Bracket wing adjustment device; 25. Mechanical aeration system outlet; 26-1. Mechanical aeration system inlet one; 26-2. Mechanical aeration system inlet two; 27. Liquid; 28. Cavitation; 29-1. Air injection device bearing one; 29-2. Air injection device bearing two; 30-1. Air injection device upper box; 30-2. Air injection device lower box; 31. Air compressor; 32. High-pressure air storage system; 33. Air source distribution box; 34. High-pressure air; 35. Rotating motor; 36. Worm; 37. Connecting rod; 38. Worm wheel; 39. Bearing; 40. Baffle; 41. Bracket wing adjustment device cover. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, an enhanced aeration cavitation generating device of the present invention comprises a mechanical aeration system 9, a water tank 1, a filter 2, a high-pressure pump 3, a pressure regulating valve 4, a pressure sensor 5, a PLC central controller 6, a vortex flowmeter 7 and a control computer 8. The water tank 1 is used to store water, and the outlet of the water tank 1 is connected to the filter 2, the high-pressure pump 3, the pressure regulating valve 4, the pressure sensor 5, the vortex flowmeter 7 and the mechanical aeration system 9 in sequence through a reflux pipe. Among them, the outlet of the mechanical aeration system 9 is connected to the cavitation nozzle 13 through a pipe, and the cavitation nozzle 13 is immersed in the water tank 1 to realize the closure of the entire system. The pipe connecting the cavitation nozzle 13 is also connected to a fixed support frame 14 to ensure the stable operation of the cavitation nozzle 13. The cavitation nozzle 13 can also be moved through a movable connection with the support frame 14 to adjust the position of the cavitation nozzle 13 in the water tank 1. The PLC central controller 6 is connected to the high-pressure pump 3, the pressure regulating valve 4, the pressure sensor 5 and the vortex flowmeter 7 respectively, controls the operation of the high-pressure pump 3 and the pressure regulating valve 4 and collects data from the pressure sensor 5 and the vortex flowmeter 7. The PLC central controller 6 and the control computer 8 are bidirectionally connected, and data is collected through the PLC central controller 6, and real-time monitoring and specific working condition settings are performed on the computer 8.

[0028] like Figure 2As shown, the mechanical aeration system 9 includes an upper box 15-1 and a lower box 15-2, forming a closed cavitation space. The upper box 15-1 and the lower box 15-2 are fixed and sealed by bolts, and the bottom of the lower box 15-2 is fixed on a horizontal plane by a bracket. The upper section of the upper box 15-1 is processed into a cone, and a through hole is processed on the top of the cone as a mechanical aeration system outlet 25. The mechanical aeration system outlet 25 is connected to the cavitation nozzle 13 through a pipeline. The lower section of the upper box 15-2 is a cylinder with an open bottom surface. The lower box 15-2 is a cylinder with an open top surface. A through hole is processed on the bottom of the lower box 15-2, and a waterproof mechanical aeration system bearing 18 is installed. Through holes are processed on both sides of the lower box 15-2 as a mechanical aeration system inlet 1 26-1 and a mechanical aeration system inlet 2 26-2. After passing through the vortex flowmeter 7, the return pipe enters the mechanical aeration system 9 from the mechanical aeration system inlet 1 26-1 and the mechanical aeration system inlet 2 26-2.

[0029] An air injection device 10, a reduction box 11 and a driving motor 12 are placed under the lower housing 15-2. The air injection device 10 is arranged between the lower housing 15-2 and the reduction box 11. The output shaft of the driving motor 12 is connected to the reduction box 11. The reduction box 11 is provided with three mutually meshing bevel gears, namely, a driving wheel 21-2, a driven wheel 1 21-1 and a driven wheel 2 21-3. The three bevel gears are installed in the reduction box 11 according to a specific spatial layout, supported by high-precision rolling bearings, and fixed in a predetermined position to form a tightly meshed system. The output shaft of the driving motor 12 is coaxially fixedly connected to the driving wheel 21-2, and the driven wheel 1 21-1 and the driven wheel 2 21-3 are arranged in parallel one below the other, and mesh with the driving wheel 21-2. The driven wheel 1 21-1 is coaxially fixedly connected to the inner main shaft 20, and the driven wheel 2 21-3 is coaxially fixedly connected to the outer main shaft 19. The power is transmitted by the outer main shaft 19 and the inner main shaft 20 to form a double-branch transmission path. The inner main shaft 20 passes through the outer main shaft 19 upward coaxially, and the outer main shaft 19 and the outer main shaft 19 together form a driving shaft. The driving shaft passes through the air injection device 10 upward and enters the closed cavitation space from the mechanical aeration system bearing 18.

[0030] The actual length of the outer main shaft 19 is smaller than that of the inner main shaft 20. The upper end and the lower end of the inner main shaft 20 both extend outside the outer main shaft 19. The outer main shaft 19 extends upward into the closed cavitation space. Three horizontal lower brackets 22-1 are fixedly welded at the upper end extending into the closed cavitation space. The three horizontal lower brackets 22-1 are evenly arranged along the circumferential direction. Two lower bracket wings 23-1 are fixedly welded vertically upward on the upper surface of each lower bracket 22-1, and the lower bracket wings 23-1 are perpendicular to the lower bracket 22-1.

[0031] The inner main shaft 20 is fixedly welded with three horizontal upper brackets 22-2 at the upper end extending into the closed cavitation space. The three upper brackets 22-2 are directly above the three lower brackets 22-1. The three upper brackets 22-2 are evenly arranged along the circumferential direction. Two upper bracket wings 23-2 are fixedly welded vertically downward on the lower surface of each upper bracket 22-2. The upper bracket wings 23-2 are perpendicular to the upper bracket 22-2, and the lower ends do not contact the lower bracket wings 23-1. The upper bracket wings 23-2 and the lower bracket wings 23-1 are staggered and do not interfere with each other. A bracket wing adjustment device 24 is also installed above the inner main shaft 20.

[0032] like Figure 3 and Figure 4 As shown, the inner surfaces of the upper box 15-1 and the lower box 15-2 of the mechanical aeration system 9 are uniformly processed with a number of protrusions 16, which are hemispherical and are evenly and regularly distributed in a grid shape on the inner wall of the closed mechanical aeration system 9. The liquid 27 injected into the closed cavitation space will undergo body cavitation with the protrusions 16, thereby generating cavitation bubbles 28. Three pressure sensors 17 are evenly installed on the top of the cylinder of the upper box 15-1, and the pressure sensors 17 are fixed by bolts to achieve real-time data transmission and monitoring. The pressure sensors 17 are distributed on the inner wall at equal angles, forming a three-dimensional symmetrical layout.

[0033] like Figure 5 As shown, the air injection device 10 has a closed air injection space composed of an upper box 30-1 of the air injection device and a lower box 30-2 of the air injection device, and the upper box 30-1 of the air injection device and the lower box 30-2 of the air injection device are connected by bolts. The upper box 30-1 of the air injection device is processed into a cylinder with an open lower portion, and a through hole is processed on the top to install a sealed air injection device bearing 1 29-1. The lower box 30-2 of the air injection device is processed into a cylinder with an open upper portion, and a through hole is processed on the bottom to install a sealed air injection device bearing 2 29-2, and a through hole is processed on the side as an air inlet hole to connect the air injection pipe. Outside the closed air injection space of the air injection device 10, an air compressor 31, a high-pressure air storage system 32 and an air source distribution box 33 are connected in sequence through an air injection pipe, and high-pressure air 34 is injected into the air injection space through the air inlet hole on the side of the lower box 30-2 of the air injection device. The outer spindle 19 and the inner spindle 20 pass through the closed air injection space of the air injection device 10 .

[0034] The outer diameter of the inner spindle 20 is smaller than the inner diameter of the outer spindle 19, so there is a radial gap between them. The outer spindle 19 and the inner spindle 20 are processed as hollow shafts as a whole, and a number of micron-level through holes are processed on the side walls of the section where the outer spindle 19 and the inner spindle 20 extend into the closed air injection space of the air injection device 10. The micron-level through holes of the outer spindle 19 and the inner spindle 20 are processed perpendicular to their respective axes, and the through holes are arranged in an orderly manner in a honeycomb shape. The outer spindle 19 is sealed and connected to the housing of the air injection device 10 through the corresponding air injection device bearing 1 29-1 and the air injection device bearing 2 29-2, and passes through the air injection device 10.

[0035] like Figure 6 As shown, the outer spindle 19 and the inner spindle 20 are coaxial, the inner spindle 20 passes upwards from the outer spindle 19, the upper end of the outer spindle 19 is below the inner spindle 20, and the upper end of the outer spindle 19 is evenly connected to three lower brackets 22-1 at equal angles, and each lower bracket 22-1 is connected to two lower bracket wings 23-1. The upper end of the inner spindle 20 is evenly connected to three upper brackets 22-2 at equal angles, and each upper bracket 22-2 is connected to two upper bracket wings 23-2. The lower bracket wings 23-1 of the outer spindle 19 are connected upwards, and the upper bracket wings 23-2 of the inner spindle 20 are connected downwards, and the lower bracket wings 23-1 and the upper bracket wings 23-2 are installed in opposite directions. They are staggered in the diameter direction of the outer spindle 19 and the inner spindle 20, and do not contact each other during rotation. The lower bracket wing 23-1 and the upper bracket wing 23-2 are wings similar to wings formed symmetrically on the upper half of the actual wing, and are obtained by symmetrically processing the upper half of the actual wing, so they have symmetry. The axial cross-sections of the lower bracket wing 23-1 and the upper bracket wing 23-2 are both the same teardrop shape. The lower bracket 22-1 and the upper bracket 22-2 are flat rectangular parallelepipeds, and the rounded corners are processed according to the direction of the incoming water flow during actual rotation.

[0036] like Figure 6 and Figure 7As shown, a bracket wing adjustment device 24 is installed on the upper part of the inner main shaft 20, which can drive the upper bracket wing 23-2 to rotate. The bracket wing adjustment device 24 is composed of a rotating motor 35, a worm 36, a connecting rod 37, a worm wheel 38, a bearing 39, a baffle 40 and a bracket wing adjustment device cover 41. An identical bracket wing adjustment device 24 is installed on the upper surface of each bracket of the upper bracket 22-2. The rotating motor 35 is installed on the upper surface of the upper bracket 22-2 near the inner main shaft 20, that is, the inner side. The output shaft of the rotating motor 35 connects and drives two worms 36, and the two worms 36 are coaxially connected by a connecting rod 37 to achieve coaxial drive. A worm 36 and a worm wheel 38 are meshed to convert the drive of the rotating motor 35 into the rotation of the worm wheel 38. The upper half of the worm wheel 38 and the baffle 40 are driven by a key connection. The baffle 40 passes through the upper bracket 22-2 through the bearing 39 and is connected to the upper bracket 22-2. The lower part of the baffle 40 is below the upper bracket 22-2, and the shape is a sleeve that fits tightly against the upper bracket wing 23-2. When the upper wing 23-2 is welded and installed, it fits tightly against the groove of the lower part of the baffle 40 and is fixed to the baffle 40, so that the rotating motor 35 drives the upper bracket wing 23-2 to rotate. In actual work, a sealed and waterproof bracket wing adjustment device cover 41 is installed outside the bracket wing adjustment device 24. The bracket wing adjustment device cover 41 is a semi-cylindrical shell that plays a waterproof role. Figure 6 Only one bracket wing adjustment device cover plate 41 is shown as an example. In actual work, the three bracket wing adjustment devices 24 need to be installed with the bracket wing adjustment device cover plate 41.

[0037] like Figure 7As shown, the outer spindle 19, the inner spindle 20, the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1 and the upper bracket wing 23-2 are all processed into a hollow structure, and through holes are processed on the surfaces of the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1 and the upper bracket wing 23-2 as exhaust holes to release the high-pressure air 34. The baffle 40 is a rotating body structure, and the upper part is processed with a keyway for connecting with the worm gear 38. The middle part passes through the upper bracket 22-2, and a through hole is processed in the middle part, so that the baffle 40 does not block the high-pressure air 34 in the upper bracket 22-2 part, and the high-pressure air 34 enters the upper bracket 22-2. The lower part is below the upper bracket 22-2, and the sleeve-like structure can fit tightly with the upper bracket wing 23-2, and can ensure that the upper bracket wing 23-2 rotates when it rotates by itself through mechanical force transmission. In addition, through holes are processed at the connection parts of the baffle 40 and the upper bracket wing 23-2 to realize the circulation of high-pressure air 34, and finally realize that after the high-pressure air 34 is injected into the outer main shaft 19 and the inner main shaft 20 by the air injection device 10, it is driven by pressure to be transported to the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1 and the inside of the upper bracket wing 23-2. The outer main shaft 19 and the lower bracket 22-1 are welded and connected, and a part of the high-pressure air 34 is discharged from the exhaust hole of the lower bracket 22-1, and the other part enters the lower bracket wing 23-1 through the through hole connecting the lower bracket 22-1 and the lower bracket wing 23-1, and is discharged through the exhaust hole of the lower bracket wing 23-1. A portion of the high-pressure air 34 entering the inner main shaft 20 is discharged through the exhaust hole of the upper bracket 22-2, and the other portion enters the baffle 40 through the through hole machined in the upper bracket 22-2, and enters the upper bracket wing 23-2 through the through hole machined at the connection between the baffle 40 and the upper bracket wing 23-2, and is finally discharged into the closed cavitation space of the mechanical aeration system 9.

[0038] like Figure 1As shown, the high-pressure pump 3 provides power for the entire enhanced aeration cavitation generating device. When the high-pressure pump 3 is working, the liquid 27 circulates in the system. The liquid 27 first flows through the return pipe of the water tank 1 and then flows through the filter 2, where the liquid 27 is filtered to ensure that it is a single-phase flow, so as to ensure the stability and transmission efficiency of the generator operation. Then the liquid 27 flows into the high-pressure pump 3, the pressure regulating valve 4, the pressure sensor 5 and the vortex flowmeter 7 through the return pipe, and finally enters the closed cavitation space through the mechanical aeration system inlet 1 26-1 and the mechanical aeration system inlet 2 26-2 of the mechanical aeration system 9. When the closed cavitation space of the mechanical aeration system 9 is filled with liquid 27, the drive motor 12 starts to work, driving the mechanical aeration system 9 to operate, and the reacted liquid 27 and cavitation 28 are discharged from the mechanical aeration system outlet 25 through the cavitation nozzle 13 connected by the pipeline into the water tank 1, so as to realize the circulation of the liquid 27. The cavitation nozzle 13 is immersed in the water tank 1, so that the discharged water jet is a submerged water jet, which improves the performance. The cavitation nozzle 13 can be moved by means of the movable connection with the support frame 14 to meet the requirements of different working conditions. The pressure regulating valve 4 is introduced to control the pressure of the system, maintain the stability of the entire enhanced aeration cavitation generator, and prevent the device from being damaged by excessive or low pressure. The pressure sensor 5 is introduced to measure the pressure in the pipe in real time. The vortex flowmeter 7 is introduced to measure the real-time liquid flow in the pipeline, and benefit from its high precision and stability, improve the reliability of the enhanced aeration cavitation generator, and reduce maintenance costs. The PLC central controller 6 is selected to receive data, and the opening of the pressure regulating valve is adjusted using a multivariable control strategy so that the flow and pressure are within the set range. Finally, the above control system is integrated to ensure stable operation and realize the cavitation intensity control of the enhanced aeration cavitation generator.

[0039] like Figure 2As shown, the closed cavitation space formed by the upper box 15-1 and the lower box 15-2 is used as the core of the mechanical aeration system 9 for aeration and cavitation, and the external components serve the purpose of driving the system and injecting gas into the main shaft. After the liquid 27 is injected into the closed cavitation space from the mechanical aeration system inlet 1 26-1 and the mechanical aeration system inlet 2 26-2, the drive motor 12 starts to work, and provides power to the entire mechanical aeration system 9 through the reduction box 11. The output shaft of the drive motor 12 is coaxially fixedly connected to the driving wheel 21-2, and the driving wheel 21-2 and the driven wheel 1 21-1 and the driven wheel 21-3 are meshed with each other to achieve the reverse rotation of the two driven wheels. The driven wheel 1 21-1 is coaxially fixedly connected to the inner main shaft 20, and the driven wheel 2 21-3 is coaxially fixedly connected to the outer main shaft 19, so as to achieve the coaxial reverse rotation of the outer main shaft 19 and the inner main shaft 20. The outer main shaft 19 drives the connected lower bracket 22-1 and the lower bracket wing 23-1, and the inner main shaft 20 drives the connected upper bracket 22-2 and the upper bracket wing 23-2 to rotate in the opposite direction at the same time, mechanically stirring and colliding the liquid 27, causing a strong turbulent effect, so that the liquid 27 and the cavitation 28 are effectively mixed, and the cavitation 28 is more uniform. At the same time, during the aeration process, mechanical stirring increases the gas-liquid contact area and enhances the aeration effect. In addition, the coaxial counter-rotating main shafts balance the centrifugal force, reduce vibration, and improve the reliability of the design.

[0040] A series of equipment for manufacturing low-pressure areas, performing cavitation initiation, maintaining the stability of cavitation bubbles 28 and discharging the cavitation bubbles 28 are installed inside the closed mechanical aeration system 9, including an outer spindle 19, an inner spindle 20, a lower support 22-1, an upper support 22-2, a lower support wing 23-1, an upper support wing 23-2 and a support wing adjustment device 24. The support wing adjustment device 24 is installed on the top of the inner spindle 20. The outer spindle 19 and the inner spindle 20 are both hollow cylinders, located at the center of the closed cavitation space inside the mechanical aeration system, with opposite rotation directions, and the interior is hollow to achieve ventilation. When the drive motor 12 is working, the spindle is driven to rotate, driving the connected lower support 22-1, upper support 22-2, lower support wing 23-1, and upper support wing 23-2 to rotate at the same time, and all support wings 23 of the outer spindle 19 rotate counterclockwise, and all support wings 23 of the inner spindle 20 rotate clockwise. A stirring effect is achieved, forming a relatively symmetrical water flow shape, making the cavitation bubbles 28 more uniform. The clearance between the liquid circulation inlet and the main shaft on both sides of the lower box is equal, and the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1, and the upper bracket wing 23-2 are close to the mechanical aeration system outlet 25. High-speed gas-liquid two-phase flow is formed in the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1, and the upper bracket wing 23-2, and the low-speed single-phase flow in the remaining area is sucked in under the action of pressure, and the cavitation cycle is continuously performed.

[0041] like Figure 3 and Figure 4As shown, when the liquid 27 is immersed in the closed cavitation space, it collides with the protrusion 16 protruding along the flow direction of the fluid under the drive of the high-speed rotating main shaft. The protrusion 16 increases the surface roughness. When the high-speed flowing liquid 27 passes through the protrusion 16, the boundary layer separation and low-pressure area will be first formed in this area. In this way, a small volume of low-pressure area can be generated, and a small-scale cavitation 28 can be generated. It plays an auxiliary role through the cavitation of the protrusion body, and at the same time, it also avoids the collapse of the cavitation 28 caused by the excessive pressure in the flow field outside the low-pressure area of ​​the high-speed rotation of the main shaft. Through the three pressure sensors 17 installed on the wall of the upper box body 15-1, the pressure changes in all directions inside the cavity can be accurately measured when the system is working. The cavitation 28 generated by the wall protrusion 16 will be discharged from the outlet 25 of the mechanical aeration system together with the cavitation 28 and the liquid 27 generated by the mechanical aeration of the lower bracket 22-1, the upper bracket 22-2 and the lower bracket wing 23-1, and the upper bracket wing 23-2 under the action of pressure. The upper part of the upper box 15-1 is processed into a cone shape to prevent the accumulation of cavitation bubbles 28 due to unreasonable shape design and to increase the speed of cavitation circulation. At the same time, the entire mechanical aeration system is installed vertically upward, and the air buoyancy of the cavitation bubbles themselves is utilized to realize more concentrated cavitation bubbles flowing out with high-pressure water at the top outlet, thereby improving the gas outlet efficiency.

[0042] like Figure 5 As shown, the air injection device 10 has a closed air injection space composed of an upper box 30-1 and a lower box 30-2 of the air injection device, and the external mounting components play the role of compressing and conveying air. The air compressor 31 and the drive motor 12 start working synchronously. As the core component of the air injection device 10, the air compressor 31 sucks in air and compresses it to the required high pressure level. The compressed high-pressure air 34 will be delivered to the high-pressure air storage system 32 through a delivery pipeline. The high-pressure air storage system 32 stores and regulates the high-pressure air 33 delivered from the air compressor 31 to ensure that the air pressure remains within the set range, providing a stable gas supply for the air injection device 10. Finally, the high-pressure air 34 is delivered to the air injection space through the air source distribution box 33, and the flow rate and pressure are adjusted as needed. In the air injection space, high-pressure air 34 enters the hollow interior of the main shaft through the honeycomb-shaped staggered through holes processed on the outer main shaft 19 and the inner main shaft 20, and is then driven by the pressure difference and finally discharged from the exhaust holes processed on the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1 and the upper bracket wing 23-2. By introducing the air injection device 10 and using the main shaft to mechanically aerate the liquid, the quality and efficiency of the cavitation generator in generating cavitation bubbles are improved.

[0043] like Figure 6As shown, the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1 and the upper bracket wing 23-2 are the main internal parts of the mechanical aeration system 9. When the driving motor 12 is working, the main shaft is driven, the outer main shaft 19 rotates counterclockwise, and the connected lower bracket 22-1 and the lower bracket wing 23-1 also rotate counterclockwise, the inner main shaft 20 rotates clockwise, and the connected upper bracket 22-1 and the upper bracket wing 23-1 also rotate clockwise. Finally, all the bracket wings 23 are arranged in a staggered manner and rotate. The high-speed rotating bracket wings 23 will form low-pressure areas on both sides due to the structural design. When the liquid 27 entering the cavitation space flows into this area, if the current low pressure is lower than the saturated vapor pressure under the working condition, cavitation occurs, resulting in the generation of cavitation bubbles 28. Since the bracket 22 and the bracket wing 23 are hollow inside, and the millimeter-level exhaust holes are processed on the surface, the high-pressure air 34 injected into the main shaft by the air injection device 10 will be discharged through the exhaust holes to form cavitation bubbles 28. The cavitation generated by mechanical aeration will maintain its shape after entering the low pressure area generated by the lower support wing 23-1 and the upper support wing 23-2, so as to avoid the rupture of the cavitation 28 due to the pressure increase. The high-speed rotating main shaft drives the lower support 22-1, the upper support 22-2, the lower support wing 23-1 and the upper support wing 23-2, so that the flow direction and speed of the fluid suddenly change, thereby forming a vortex and stirring effect, making the cavitation 28 more uniform and improving the quality of the cavitation 28.

[0044] Furthermore, the main components of mechanical aeration, i.e., the lower support 22-1, the upper support 22-2, the lower support wing 23-1 and the upper support wing 23-2, are arranged as close to the top of the upper box 15-1 as possible, so that a low-pressure zone of a certain area will be formed during operation, and through the mechanical aeration and stirring effect, a large number of cavitation groups will be triggered, and finally a high-speed rotating low-pressure zone centered on the main axis will be formed. At the same time, the liquid 27 is subjected to the centrifugal effect, and the increase in flow rate and the enhancement of the centrifugal effect help to form a stronger movement and collision of the liquid 27 between the lower support 22-1, the upper support 22-2, the lower support wing 23-1 and the upper support wing 23-2, forming a cavitation collision zone, which further promotes the occurrence of the cavitation effect. The high-speed rotating low-pressure zone is surrounded by a relatively high-pressure zone. The cavitation space enclosed by the mechanical aeration system can be two basins: a high-speed rotating low-pressure zone centered on the main axis, and a relatively high-pressure zone inside the box. Due to the design of the protrusion 16, the relatively high-pressure zone inside the box will also produce cavitation bubbles 28 due to the cavitation assistance of the protrusion. Finally, the cavitation 28 generated by the protrusion, the cavitation 28 generated by the low pressure area generated by the lower bracket 22-1, the upper bracket 22-2, the lower bracket wing 23-1 and the upper bracket wing 23-2, the cavitation 28 generated by the mechanical aeration and the liquid 27 injected into the mechanical aeration system form a gas-liquid two-phase flow, which is discharged from the mechanical aeration system outlet 25 of the upper box body 15-1 due to the buoyancy of the air, and discharged as a jet from the cavitation nozzle 13 through the connecting pipe. The high-speed gas-liquid two-phase flow is injected into the static water tank 1 from the cavitation nozzle 13, and a strong shearing effect is generated due to the drastic difference in speed, resulting in a large number of cavitation groups in the water tank again, which together with the water discharged from the mechanical aeration system form a continuous cavitation jet, thereby improving the cavitation intensity.

[0045] like Figure 7 As shown, when the cavitation intensity of the enhanced aeration cavitation generating device needs to be changed, the bracket wing adjustment device 24 starts to work, and the cavitation intensity of the device is changed by rotating the upper bracket wing 23-2 in the vertical direction. When the rotary motor 35 rotates, the output shaft coaxially drives two worms 36, and the worms 36 are connected by a connecting rod 37. The worm 36 is meshed with the worm wheel 38, and the worm wheel 38 is connected to the baffle 40 through a key connection. The upper bracket wing 23-2 is installed at the lower sleeve of the baffle 40, and finally the upper bracket wing 23-2 is rotated in the vertical direction. A sealed and waterproof bracket wing adjustment device cover 41 is installed on the outside of the bracket wing adjustment device 24 to ensure the stability of the bracket wing adjustment device 24 when it is working. The introduction of the bracket wing adjustment device 24 allows the upper bracket wing 23-2 to rotate to a certain extent, which can change the area of ​​the low-pressure zone, thereby changing the cavitation intensity of the device. At the same time, the three rotating motors 35 can realize asynchronous rotation as needed, so that the six upper bracket wings 23-2 can perform more groups of rotation coordination, and finally realize a larger range of cavitation intensity changes.

Claims

1. An enhanced aeration cavitation generating device, wherein the outlet of a water tank (1) is connected to the inlet of a mechanical aeration system (9) through a return pipe, characterized in that: The mechanical aeration system (9) comprises a closed cavitation space formed by an upper box (15-1) and a lower box (15-2); a mechanical aeration system outlet is provided at the top of the upper box (15-1); the mechanical aeration system outlet is connected to a cavitation nozzle (13) submerged in the water tank (1) via a pipeline; and inlets of the mechanical aeration system (9) are provided on both sides of the lower box (15-2); An air injection device (10), a reduction box (11) and a driving motor (12) are arranged below the lower box body (15-2); three bevel gears, namely a driving wheel (21-2), a driven wheel 1 (21-1) and a driven wheel 2 (21-3), are arranged in a coaxial manner with the driving wheel (21-2); the driven wheel 1 (21-1) and the driven wheel 2 (21-3) are arranged in parallel one above the other and are both meshed with the driving wheel (21-2); the driven wheel 1 (21-1) is coaxially fixedly sleeved on the inner main shaft (20); and the driven wheel 2 (21-3) is coaxially fixedly sleeved on the outer main shaft (19); the air injection device (10) has a closed air injection space, and high-pressure air is injected into the closed air injection space; The inner main shaft (20) passes through the outer main shaft (19) coaxially, the outer diameter of the inner main shaft (20) is smaller than the inner diameter of the outer main shaft (19), and there is a radial gap between them. The outer main shaft (19) and the inner main shaft (20) pass through the closed air injection space upwards and extend into the closed cavitation space and are sealed to connect the air injection device (10) and the mechanical aeration system (9); Three horizontal lower brackets (22-1) are evenly arranged along the circumferential direction at the upper end of the outer main shaft (19) inside the closed cavitation space, and the upper surface of each lower bracket (22-1) is vertically fixedly connected to two lower bracket wings (23-1) upward; three horizontal upper brackets (22-2) are evenly arranged along the circumferential direction at the upper end of the inner main shaft (20) inside the closed cavitation space, and the lower surface of each upper bracket (22-2) is vertically fixedly connected to two upper bracket wings (23-2) downward, and the upper bracket wings (23-2) and the lower bracket wings (23-1) are arranged alternately; The outer main shaft (19) and the inner main shaft (20) are both hollow shafts, and a plurality of micrometer-level through holes are provided on the side walls of the outer main shaft (19) and the inner main shaft (20) in the closed gas injection space; the lower bracket (22-1), the upper bracket (22-2), the lower bracket wing (23-1) and the upper bracket wing (23-2) are all hollow structures and have exhaust holes on their surfaces; and a bracket wing adjustment device (24) is provided on the upper surface of each upper bracket (22-2) and can drive the upper bracket wing (23-2) to rotate.

2. The enhanced aeration cavitation generating device according to claim 1, characterized in that: The support wing adjustment device (24) is composed of a rotating motor (35), a worm (36), a connecting rod (37), a worm wheel (38), a bearing (39), a baffle (40) and a support wing adjustment device cover plate (41). The two worms (36) are coaxially connected through the connecting rod (37). The output shaft of the rotating motor (35) drives the two worms (36). One worm (36) and one worm wheel (38) are meshed. The baffle (40) is a rotating body structure. The worm wheel (38) and the upper half of the baffle (40) are connected by a key. The middle part of the baffle (40) is processed with a through hole and is connected to the upper support (22-2) through the bearing (39). The lower half of the baffle (40) is tightly fitted to the upper support wing (23-2) below the upper support (22-2).

3. The enhanced aeration cavitation generating device according to claim 1, characterized in that: The air compressor (31) is connected in sequence to the high-pressure air storage system (32), the air source distribution box (33) and the closed air injection space through an air injection pipe.

4. The enhanced aeration cavitation generating device according to claim 2, characterized in that: A sealed bracket wing adjustment device cover plate (41) is arranged outside each bracket wing adjustment device (24).

5. The enhanced aeration cavitation generating device according to claim 1, characterized in that: The outlet of the water tank (1) is connected to the filter (2), the high-pressure pump (3), the pressure regulating valve (4), the pressure sensor (5), the vortex flowmeter (7) and the inlet of the mechanical aeration system (9) in sequence through a return pipe, the PLC central controller (6) is connected to the high-pressure pump (3), the pressure regulating valve (4), the pressure sensor (5) and the vortex flowmeter (7) respectively, and the PLC central controller (6) and the control computer (8) are bidirectionally connected.

6. The enhanced aeration cavitation generating device according to claim 1, characterized in that: The inner surfaces of the upper box body (15-1) and the lower box body (15-2) are evenly provided with a plurality of hemispherical protrusions (16) regularly distributed in a grid shape.

7. The enhanced aeration cavitation generating device according to claim 1, characterized in that: The lower bracket wing (23-1) and the upper bracket wing (23-2) are wings formed symmetrically on the upper half of the actual wing, obtained by symmetrically processing the upper half of the actual wing, do not contact each other during rotation, and are staggered in the diameter direction of the outer main axis (19) and the inner main axis (20).

8. The enhanced aeration cavitation generating device according to claim 1, characterized in that: The lower bracket (22-1), the upper bracket (22-2), the lower bracket wing (23-1) and the upper bracket wing (23-2) are arranged near the top of the upper box body (15-1).

9. A working method of the enhanced aeration cavitation generating device according to any one of claims 1 to 8, characterized in that: The closed cavitation space of the mechanical aeration system (9) is filled with liquid, and the drive motor (12) and the air injection device (10) work simultaneously; The driven wheel 1 (21-1) and the driven wheel (21-3) rotate in opposite directions, the outer main shaft (19) drives the connected lower bracket (22-1) and the lower bracket wing (23-1) and the inner main shaft (20) drives the connected upper bracket (22-2) and the upper bracket wing (23-2) to rotate in opposite directions at the same time, forming a high-speed gas-liquid two-phase flow; High-pressure air enters through micrometer-level through holes on the outer main shaft (19) and the inner main shaft (20), and is discharged through exhaust holes processed on the lower bracket (22-1), the upper bracket (22-2), the lower bracket wing (23-1) and the upper bracket wing (23-2), and liquid and cavitation bubbles are mixed in the closed cavitation space.

10. The working method according to claim 9, characterized in that: The support wing adjustment device (24) works to make the six upper support wings (23-2) rotate simultaneously in the vertical direction to change the cavitation intensity.

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