Axleless suction-in multi-column tooth ladder gradient cutting gas nanobubble preparation device

Abstract

The application provides an axis-free suction type multi-column tooth gradient cutting gas nanobubble preparation device, which comprises a first cylinder body with a first inner cavity, a second cylinder body with a second inner cavity and rotatable, the second cylinder body is sleeved in the first inner cavity, the upper end of the first inner cavity is provided with a gas-liquid mixing cavity, the lower end of the mixing cavity is sequentially provided with an axis-free multi-column tooth structure and an axis-free propeller blade, the axis-free multi-column tooth structure is fixed to the inner side wall of the second inner cavity, the axis-free multi-column tooth structure has a plurality of tooth-shaped struts which are formed in a tapered manner along the radial direction of the inner side wall of the second inner cavity and extend towards the center of the second cylinder body, the gas-liquid mixed liquid can be subjected to multi-round gradient cutting, the axis-free propeller blade can roll and suck the gas-liquid mixed liquid, re-cut and break the micro-bubbles after cutting, and push the flow. The axis-free suction type mixing and cutting design is adopted, flow field disorder caused by the shaft structure is avoided, the axis-free multi-column tooth structure multi-round gradient cutting is matched with the bubble gradual refinement law of the blade cutting structure, the energy consumption is low, the prepared bubble particle size is uniform, and the stability is high.

Description

Technical Field

[0001] This application relates to the field of bubble preparation technology, and in particular to a shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device. Background Technology

[0002] Nanobubble technology, as an emerging gas-liquid mass transfer enhancement technology, has broad application prospects in various fields due to its advantages such as large specific surface area, slow rising speed, high gas dissolution efficiency, and strong stability.

[0003] Existing nanobubble preparation technologies mainly include pressurized dissolved gas method, ultrasonic disruption method, electrochemical method, and rotary shearing method, but they have many drawbacks: pressurized dissolved gas method requires high-pressure equipment, has high energy consumption and uneven bubble size distribution; ultrasonic disruption method has high equipment cost and limited large-scale production capacity; electrochemical method has fast electrode wear and high electricity cost; traditional rotary shearing method mostly adopts shafted impeller structure, which is prone to flow field turbulence, low shearing efficiency, and poor bubble refinement effect, making it difficult to stably prepare nanobubbles with uniform particle size.

[0004] In addition, the existing technology mostly uses co-current mixing of gas and liquid, which results in insufficient gas dissolution and further affects the efficiency and quality of bubble preparation.

[0005] Therefore, it is necessary to address the aforementioned shortcomings. Summary of the Invention

[0006] The purpose of this application is to overcome the shortcomings of the prior art and provide a shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device.

[0007] The shaftless suction-type multi-tooth gradient cutting dissolved gas nanobubble preparation device provided in this application includes: A first cylinder with a first inner cavity is provided. The top of the first cylinder is provided with a water inlet communicating with the first inner cavity. The upper end of the side wall of the first cylinder is provided with an air inlet pipe communicating with the first inner cavity. The gas entering the first inner cavity through the air inlet pipe and the liquid entering the first inner cavity through the water inlet pipe meet vertically at the upper end of the first inner cavity, so that the upper end of the first inner cavity forms a gas-liquid mixing chamber. A second cylinder having a second inner cavity and being driven to rotate, the second cylinder being sleeved inside the first inner cavity; A shaftless multi-column tooth structure is disposed at the upper end of the inner wall of the second inner cavity and located at the lower end of the mixing cavity. It is driven by the second cylinder to rotate at high speed and is used to perform multiple rounds of gradient collision, cutting, gas dissolution, tearing and refining of the gas-liquid mixture in the mixing cavity to generate a large number of microbubbles. It includes multiple toothed pillars. The bottom of each toothed pillar is fixed on the inner wall of the second inner cavity and extends radially towards the center of the second cylinder to form a top. The radial gap between the tops of each toothed pillar forms a first water passage at the center of the second inner cavity. At least two shaftless propeller blades are disposed on the inner wall of the second inner cavity and located at the lower end of the shaftless multi-column tooth structure along the axial direction of the second inner cavity. They are driven by the second cylinder to rotate at high speed to entrain the gas-liquid mixture in the mixing chamber to form a vortex turbulence and to further stir, break, and refine the mixture with microbubbles after being cut by the shaftless multi-column tooth structure to form a nanobubble mixture, which is then pushed out. The root of each shaftless propeller blade is fixed on the inner wall of the second inner cavity, and the tip faces the center of the second inner cavity. The radial gap between the tips of each shaftless propeller blade forms a second water passage at the center of the second inner cavity. The lower end of the first cylinder is provided with a bubble output chamber, and the bottom of the first cylinder is provided with an outlet for outputting the nanobubble mixture.

[0008] In some embodiments of the shaftless suction-type multi-column tooth gradient cutting dissolved gas nanobubble preparation device provided in this application, each of the toothed pillars is a cubic structure with the inner sidewall of the second inner cavity as the base and approximately in the shape of an equilateral trapezoid; or a pyramidal structure with a polygonal base.

[0009] In some embodiments of the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device provided in this application, each of the toothed pillars is arranged radially spaced around the inner wall of the second inner cavity, and is arranged in layers at axial intervals along the inner wall of the second inner cavity, with the toothed pillars arranged in each layer on the same axial line; or, each of the toothed pillars is arranged radially spaced around the inner wall of the second inner cavity, and is arranged in layers at axial intervals along the inner wall of the second inner cavity, with the toothed pillars arranged in adjacent layers being axially offset.

[0010] In some embodiments of the shaftless suction-type multi-column tooth gradient cutting dissolved gas nanobubble preparation device provided in this application, the number of radial columns of each toothed support surrounding the second inner cavity is 4-8, and the number of axial rows along the second inner cavity is 5-10.

[0011] In some embodiments of the shaftless suction-type multi-column tooth gradient cutting dissolved gas nanobubble preparation device provided in this application, each of the toothed pillars is arranged radially at intervals along the second inner cavity and is spirally distributed along the circumferential surface of the inner wall of the second inner cavity.

[0012] In some embodiments of the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device provided in this application, the outer wall of the second cylinder is covered with a magnetic sleeve, and an inductor coil is fixed around the inner wall of the first cylinder, corresponding to the magnetic sleeve, so that the second cylinder is suspended in the first inner cavity and rotates at high speed in the first inner cavity under the magnetic drive of the inductor coil.

[0013] In some embodiments of the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device provided in this application, sealed bearings are respectively provided at both ends of the inductor coil along the axial direction. The outer rings of the two sealed bearings are fixed on the inner sidewall of the first cylinder, and the inner rings are fixed at the two outer ends of the second cylinder along the axial direction, rotating with the second cylinder.

[0014] In some embodiments of the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device provided in this application, an electric regulator is also included, which is electrically connected to the inductor coil.

[0015] In some embodiments of the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device provided in this application, the rotational speed of the second cylinder is 5000-15000 r / min, and the power of the inductor coil is 500W-3000W.

[0016] This application has the following technical effects: (1) This application adopts a shaftless suction mixing design. A gas-liquid mixing chamber is formed by the vertical convergence of airflow and liquid at the upper end of the first cylinder. A rotatable second cylinder is set in the first cylinder. The second cylinder drives the shaftless propeller blades and shaftless multi-column tooth structure to rotate at high speed to generate a negative pressure suction effect, which continuously draws external gas into the liquid phase, improves the gas-liquid mixing efficiency, and avoids the flow field disturbance caused by the shaft structure.

[0017] (2) This application adopts a shaftless multi-column tooth structure combined with shaftless propeller blades. The second cylinder drives multiple high-speed rotating toothed pillars. Each toothed pillar is arranged in a "circumferential row + liquid direction" structure, which forms multiple rounds of gradient high-frequency collision, cutting, gas dissolution, tearing and refining of the gas-liquid mixture. The cutting frequency is ≥10. 4 The flow rate is 10 times / s. Then, through the turbulent pressurization effect of the vortex in the central water passage of the shaftless propeller blades, the microbubbles generated after collision, cutting, and tearing are stirred and broken, further refined, and flow out from the center of the vortex. This achieves efficient mass transfer between gas and liquid phases and fine control of bubbles.

[0018] (3) The shaftless multi-column tooth structure and shaftless propeller blade of this application adopt shaftless structure, eliminating the drive shaft and seals, reducing maintenance costs and operating failure rate.

[0019] (4) The structure and arrangement design of each toothed support in this application ensures uniform distribution of cutting force, and the prepared nanobubble particles are uniform in size (average particle size ≤ 100 nm) and have strong stability (24h particle size change rate ≤ 5%). This solves the technical problems of large bubble particle size, uneven distribution, poor stability and dispersed structure in traditional nanobubble mixture preparation systems, and reduces energy consumption by 30%-50% compared with traditional technology.

[0020] (5) The present application covers the outer wall of the second cylinder with a magnetic sleeve, and at the same time fixes the inductor coil around the inner wall of the first cylinder relative to the magnetic sleeve. The second cylinder is driven to suspend in the first cylinder and rotate at high speed through the inductor coil. This is beneficial to the design of shaftless propeller blades and shaftless multi-column tooth structure. The structure is simple and easy to operate. It does not require high-voltage equipment, has strong large-scale production capacity, and significantly reduces production costs and operating energy consumption. Furthermore, by adapting the speed adjustment of 5000-15000r / min and the power range of 500W-3000W through the electronic speed controller, it can prepare nanobubbles of various gases such as air, oxygen, ozone, and carbon dioxide. It can be applied to multiple application scenarios such as water treatment, air pollution control, precision cleaning, aquaculture, agricultural planting, and medical care. The economic benefits are very significant and it has good application prospects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device provided in this application; Figure 2 for Figure 1 AA section view; Figure 3 This is a schematic diagram showing the connection of external devices to an embodiment of the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device provided in this application.

[0022] In the picture: 1-First cylinder; 101-Middle cylinder; 102-Upper cylinder; 103-Lower cylinder; 11-First inner cavity; 111-Mixing cavity; 112-Bubble output cavity; 12-Inlet; 13-Outlet; 14 - Intake pipe; 2-Second cylinder; 21-Second inner cavity; 211-First water passage; 212-Second water passage; 22-Magnetic sleeve; 3-Shaftless multi-column tooth structure; 31-Toothed support column; 311-Bottom; 312-Top; 4-Shaftless propeller blade; 41-Root; 42-Tip; 5 - Inductor coil; 51 - Sealed bearing; 6-DC power supply; 7-Electronic controller; 8-Gas tank. Detailed Implementation The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application. Similarly, the following embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "middle," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "upper end," "lower end," and "side end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In this invention, the terms "one embodiment" or "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment, which are included in at least one embodiment of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments. Moreover, those skilled in the art can combine and integrate the different embodiments described in this specification and the features of the different embodiments without contradiction.

[0028] In this invention, the term "generally presents" describes the main features of an overall structure or shape. When describing the shape of an object, this means that the object primarily presents a certain shape, but may differ in non-functional details. These differences in detail do not affect the overall features and can therefore be categorized as "generally presents" a certain shape. For example, when describing a cylindrical object, stating "generally cylindrical" means that the overall shape of the object is cylindrical, but there are differences in some non-functional details. Similarly, when describing a cube, stating "generally cubic" means that the overall shape of the object is cubic, but there are differences in some non-functional details.

[0029] The following describes some specific implementation schemes of this application with reference to the accompanying drawings.

[0030] See Figures 1-3 This application provides a shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device, comprising: The first cylinder 1 has a first inner cavity 11. An inlet 12 is provided axially at the top of the first cylinder 1, communicating with the first inner cavity 11. The inlet 12 is connected to a water source (or sewage, wastewater, or other liquid requiring treatment), allowing the liquid from the water source to be introduced into the first inner cavity 11 along the axial direction of the first cylinder 1. An air inlet pipe 14 is provided at the upper end of the side wall of the first cylinder 1. One end of the air inlet pipe 14 extends radially into the first inner cavity 11 along the side wall of the first cylinder 1, communicating with the first inner cavity 11. The other end of the air inlet pipe 14 can be connected to a gas tank 8 or a gas source, where the gas is air, oxygen, ozone, carbon dioxide, or other gas sources. When liquid enters through inlet 12, gas enters the first inner cavity 11 through inlet pipe 14. The gas and liquid entering the first inner cavity 11 through inlet 12 perpendicularly meet and mix at the upper end of the first inner cavity 11, forming a gas-liquid mixture with a gas-liquid volume ratio of 1:50 to 100. This makes the upper space of the first inner cavity 11 a gas-liquid mixing chamber 111, thereby improving gas dissolution efficiency. At the lower end of the first inner cavity 11, a bubble output chamber 112 is provided, and the bottom of the first cylinder 1 is provided with an outlet 13 for outputting the nanobubble mixture.

[0031] See Figure 1 In some embodiments of this application, the first cylinder 1 may be composed of an upper cylinder 102, a middle cylinder 101 and a lower cylinder 103 arranged in segments and axially combined in sequence. The cylinder walls of the upper cylinder 102 and the middle cylinder 101, and the middle cylinder 101 and the lower cylinder 103 are fixedly connected to each other. The upper cylinder 102 is the water inlet section, which includes a conical cylinder structure with a water inlet 12 at the small end. The water inlet 12 is axially located at the top of the conical cylinder of the upper cylinder 102. One end of the air inlet pipe 14 extends radially into the first inner cavity 11 along the side wall of the upper cylinder 102. The middle cylinder 101 is the working section and is roughly cylindrical. The lower cylinder 103 is the output section, which includes a conical cylinder structure with a bubble output cavity 112 at the small end and facing away from the middle cylinder 101 and inverted relative to the shape of the upper cylinder 102. The outlet 13 of the nanobubble mixture is located at the bottom of the conical cylinder of the lower cylinder 103. The first cylinder 1 of this application adopts a segmented assembly design, which is beneficial to the processing and manufacturing of the first cylinder 1 and also facilitates the installation of various components inside the second cylinder 2. It is understood that the above-mentioned combined structure and connection of the upper cylinder 102, middle cylinder 101 and lower cylinder 103 can also adopt a straight cylinder shape, or other forms and structures, all of which are within the scope of protection of this application.

[0032] The second cylinder 2 is roughly cylindrical and has a second inner cavity 21. The outer wall shape of the second cylinder 2 is the same as the inner cavity shape of the middle cylinder 101, but its diameter is smaller than the inner diameter of the middle cylinder 101, so that the second cylinder 2 can be fitted into the inner cavity of the middle cylinder 101 and can be driven to rotate inside the inner cavity of the middle cylinder 101.

[0033] The shaftless multi-column tooth structure 3 is located at the lower end of the mixing chamber 111 (along the liquid flow direction of the inlet 12, at the front end of the mixing chamber 111) and is set at the upper end of the inner wall of the second inner cavity 21, and is driven to rotate at high speed by the second cylinder 2. The shaftless multi-column tooth structure 3 includes multiple spaced toothed support columns 31. Each toothed support column 31 is used to perform multiple rounds of gradient collision, cutting, gas dissolution, tearing and refining on the gas-liquid mixture from the mixing chamber 111 during high-speed rotation. The bottom 311 of each toothed support column 31 is fixed on the inner wall of the second inner cavity 21 and extends forward in a tapering manner towards the center of the second cylinder 2 along the radial direction of the inner wall of the second inner cavity 21 to form a top 312. Multiple toothed support columns 31 can be arranged radially and axially along the circumferential surface of the inner wall of the second inner cavity 21 to form a "circumferential row + liquid row" array. There are radial gaps between the tops 312 of each toothed support column 31 towards the center of the second cylinder 2. These gaps form a first water passage 211 at the center of the second inner cavity 21. When the second cylinder 2 rotates, the gas-liquid mixture in the mixing chamber 111 is drawn into the shaftless multi-column toothed structure 3 region. Multiple spaced toothed pillars 31 continuously engage in multiple rounds of gradient collisions and cutting, causing the gas-liquid mixture to be initially refined through tearing by the toothed pillars 31, generating a large number of microbubbles. The pressurized environment of the second inner cavity 21 increases the initial solubility of the gas. While cutting, each toothed pillar 31, as it rotates, forms a vortex at the first water passage 211, causing the gas-liquid mixture to continuously advance forward during the cutting process, undergoing turbulent compression and collisions to achieve multiple breaks, forming a mixture with microbubbles at the end of the shaftless multi-column toothed structure 3. Thus, during the high-speed rotation of the second cylinder 2, the gas-liquid mixture sequentially passes through each toothed pillar 31, undergoing multiple rounds of gradient collisions, cutting, tearing, and refinement along the radial and axial directions of the second inner cavity 21, and flows forward through the vortex of the first water passage 211, completing the process of gas-liquid mixing and dissolved gas forming microbubbles.

[0034] At least two shaftless propeller blades 4 are disposed on the inner wall of the second inner cavity 21 and located along the axial direction of the second inner cavity 21 on the side of the shaftless multi-column tooth structure 3 opposite to the inlet 12. At the lower end of the shaftless multi-column tooth structure 3 (located at the front end of the shaftless multi-column tooth structure 3 along the liquid flow direction of the inlet 12), they are driven to rotate together with the shaftless multi-column tooth structure 3 by the second cylinder 2. The shaftless propeller blades 4 are radially arranged toward the center of the second inner cavity 21, with the root 41 fixed on the inner wall of the second inner cavity 21 and the tip 42 facing the center of the second inner cavity 21. The shaftless propeller blades 4 are tilted forward (away from the inlet 12) at an angle of 10-20° to facilitate the forward propulsion of the liquid. There is a certain gap in the radial direction between the tips 42 of each shaftless propeller blade 4 and the center of the second inner cavity 21. The gap forms a second water passage 212 at the center of the second inner cavity 21. The second water passage 212 and the first water passage 211 are on the same axis of the second inner cavity 21. The diameter of the second water passage 212 is generally larger than that of the first water passage 211. When the shaftless propeller blade 4 rotates at high speed under the drive of the second cylinder 2, the spiral stirring action of the shaftless propeller blade 4 generates a suction force that can create a strong negative pressure suction environment in the mixing chamber 111. This can continuously draw in external gas into the liquid phase, so that the liquid entering from the inlet 12 and the gas entering from the air inlet 14 are continuously drawn into the mixing chamber 111, and the second inner cavity 21 is pressurized. The gas and liquid mixture forms a vortex turbulence and enters the region of the shaftless multi-column tooth structure 3. That is, the liquid dynamics in the shaftless multi-column tooth structure 3 come from... The vortex turbulence generated by the rotation of the shaftless propeller blades 4, along with the microbubbles refined by multiple rounds of gradient collision, cutting, and tearing by the shaftless multi-column tooth structure 3, are further cut and broken into nano-sized bubbles by the entrainment and stirring of the shaftless propeller blades 4, and are pushed forward (pushing the flow). The nano-bubble mixture enters the bubble output chamber 112 at the lower end of the shaftless propeller blades 4 along the second water passage 212, and is then discharged from the bottom outlet 13 of the first cylinder 1 and transported to the application scenario through the output pipeline.

[0035] In the structure described above, the liquid at the inlet 12 and the airflow entering through the inlet pipe 14 can vertically converge and mix in the mixing chamber 111 at the upper end of the first inner cavity 11 to form a gas-liquid mixture. Simultaneously, the high-speed rotation and shaftless propeller blades 4 of the shaftless multi-tooth structure 3 and shaftless propeller blades 4 at the lower end of the mixing chamber 111 generate negative pressure, enabling rapid intake and initial mixing of the liquid and airflow. During the forward flow of the gas-liquid mixture, it passes through the gradient cutting channel formed in the shaftless multi-tooth structure 3, where it is intensely collided and cut by the toothed pillars 31, forming numerous microbubbles. These microbubbles are first broken down by multiple rounds of gradient cutting and compression at the same level of each row of toothed pillars 31, and then... The first water passage 211 between each row of toothed pillars 31 uses vortex flow compression, which allows insufficiently refined microbubbles to be continuously collided, cut, and torn as they move forward. The cutting frequency and extrusion pressure during the flow process increase step by step. Subsequently, the microbubbles are strongly stirred, broken, and further refined by the shaftless propeller blades 4. While ensuring the smooth forward flow of microbubbles, the cutting efficiency is further improved, realizing the cutting and breaking of microbubbles into nano-sized bubbles. It can produce stable microbubbles with uniform particle size of D10 (50-100 nm), D50 (100-200 nm), and D90 (200-380 nm) (D10, D50, and D90 are terms for nanobubble detection), which meets the standard requirements for high-quality nanobubbles.

[0036] See Figure 1 and Figure 2 In some embodiments of this application, each toothed support 31 is a trapezoidal cube structure with a quadrilateral base and an equilateral trapezoidal side projection, based on the inner wall of the second inner cavity 21; or a pyramidal structure with a polygonal base. This structure can effectively achieve the function of shaftless suction, cutting, and dissolving gas. Its edges and planes have a strong collision impact and cutting effect on the incoming gas-liquid mixture and bubbles. The orderly arrangement of multiple toothed supports 31 can refine the bubbles step by step. Moreover, the structure is simple, easy to process, and has low manufacturing cost.

[0037] See also Figure 1 and Figure 2In some embodiments of this application, each toothed support 31 may be arranged radially around the inner wall of the second inner cavity 21, at intervals around the circumference of the inner wall of the second inner cavity 21. That is, multiple toothed supports 31 are arranged at intervals around the same horizontal plane of the inner wall of the second inner cavity 21. At the same time, along the axial direction of the inner wall of the second inner cavity 21, the toothed supports 31 arranged in layers at intervals, with each layer of toothed supports 31 located on the same axial line of the inner wall of the second inner cavity 21. That is, each toothed support 31 is arranged in a consistent axial direction on the inner wall of the second inner cavity 21. In this way, the toothed supports 31 form a neat and uniform array on the inner wall of the second inner cavity 21, so that the gas-liquid mixture and bubbles are successively collided, cut, and torn into smaller pieces by the next row of toothed supports 31 during the downward flow.

[0038] In some embodiments of this application, each toothed support 31 may also be arranged radially around the inner wall of the second inner cavity 21, at intervals around the circumference of the inner wall of the second inner cavity 21. That is, multiple toothed supports 31 are arranged at intervals around the same horizontal plane of the inner wall of the second inner cavity 21. At the same time, they are arranged in layers at intervals along the axial direction of the inner wall of the second inner cavity 21, and the toothed supports 31 in adjacent layers are axially staggered. In this arrangement, because the toothed supports 31 are axially staggered, the gas-liquid mixture and bubbles are cut more precisely and thoroughly during the downward flow process, and no bubble is missed.

[0039] In some embodiments of this application, the number of radial columns of each toothed strut 31 surrounding the second inner cavity 21 is preferably 4-8 rows, and the number of rows along the axial direction of the second inner cavity 21 is preferably 5-10 columns.

[0040] In some embodiments of this application, the toothed support columns 31 can be arranged radially at intervals along the inner wall of the second inner cavity 21, and distributed in a spiral shape after being unfolded along the circumferential surface of the inner wall of the second inner cavity 21. This not only achieves multi-round gradient cutting, but also facilitates the smooth, precise and thorough flow of gas-liquid mixtures and bubbles.

[0041] See also Figure 1 and Figure 2In some embodiments of this application, a magnetic sleeve 22 is provided around the outer wall of the second cylinder 2, which can be glued and fixed to the outer wall of the second cylinder 2, so that the magnetic sleeve 22 covers and fixes the outer wall of the second cylinder 2. The magnetic sleeve 22 is made of magnetic material. At the same time, an inductor coil 5 is provided on the inner wall of the middle cylinder 101 of the first cylinder 1. The inductor coil 5 has 12 to 16 poles and is fixed to the inner wall of the middle cylinder 101. It is waterproofed by epoxy resin potting. It is arranged around the outer ring of the magnetic sleeve 22 and is corresponding to the magnetic sleeve 22. A magnetic gap is left between the two. When working, the middle cylinder 101 is fixed, and the inductor coil 5 inside the middle cylinder 101 drives the magnetic sleeve 22 to drive the second cylinder 2 to rotate. In this way, the magnetic sleeve 22 and the inductor coil 5 on the outer layer of the second cylinder 2 are connected by DC power to form a magnetic levitation structure, so that the second cylinder 2 is suspended in the first inner cavity 11 and rotates at high speed in the first inner cavity 11 under the magnetic drive of the inductor coil 5. This driving method has a simple structure and fewer components, which is conducive to the design of shaftless multi-column tooth structure 3, and provides layout space for each tooth-shaped support column 31. While improving the cutting effect, it greatly reduces energy consumption.

[0042] See further Figure 1 and Figure 3 Sealed bearings 51 are respectively provided at both ends of the inductor coil 5 along its axial direction. The outer ring of the sealed bearing 51 is fixed to the inner wall of the first cylinder 1, and the inner ring is fixed to the two outer ends of the second cylinder 2 along its axial direction, rotating with the second cylinder 2. The sealed bearings 51 can be used to position the second cylinder 2 on the first cylinder 1, and the rolling balls therein do not affect the rotation of the second cylinder 2. The use of sealed bearings 51 can also effectively prevent water from entering the inductor coil 5 and the interior of the sealed bearings 51, thus protecting the inductor coil 5 and preventing water immersion from damaging or reducing the function of the inductor coil 5. This improves the stability of the second cylinder 2, the shaftless multi-column tooth structure 3, and the shaftless propeller blades 4 during operation. At the same time, it protects the rolling elements and raceways of the sealed bearings 51, extending the service life of the sealed bearings 51.

[0043] See Figure 3 In some embodiments of this application, an electronic speed controller 7 is also included. The electronic speed controller 7 is electrically connected to the inductor coil 5 and connected to a DC power supply 6. By using the electronic speed controller 7, the rotational speed of the second cylinder 2 and the power of the inductor coil 5 can be adjusted to achieve rotational control of the second cylinder 2. When multiple similar devices are working in series, the rotational speed of the next stage can be adjusted according to the cutting effect of the previous stage to reduce energy consumption.

[0044] In some embodiments of this application, the rotational speed of the second cylinder 2 is adjustable from 5000 to 15000 r / min, the power of the inductor coil 5 is 500W-3000W, and the toothed supports 31 in the shaftless multi-column tooth structure 3 perform multi-round gradient cutting with a cutting frequency ≥10. 4 times / s.

[0045] Example 1: Orthogonal Experiment for the Preparation of Air Nanobubbles Experimental objective: The effects of the number of columns and rows of toothed support pillar 31 and the rotational speed of the second cylinder 2 on the particle size and preparation efficiency of air nanobubbles were verified.

[0046] Experimental parameter design: (1) Independent variable: Number of rows of toothed supports 31: radially arranged along the inner circumference of the inner wall of the second inner cavity 21 (A: 4 rows, 6 rows, 8 rows); Number of rows of toothed supports 31: axially arranged along the inner sidewall circumference of the second inner cavity 21 (B: 5 rows, 8 rows, 10 rows); The second cylinder rotates at two different speeds (C: 5000 r / min, 10000 r / min, 15000 r / min).

[0047] (2) Dependent variable: The average particle size (μm) and preparation efficiency (L / h) of nanobubbles are evaluated, with the proportion of bubbles with a particle size ≤100nm ≥90% as the qualified standard. (3) Fixed parameters: The inductor coil 5 has a power of 1000W, an air intake of 50L / h (pressure 0.1MPa), a water intake flow of 5m³ / h, and a toothed support column 31 that is an equilateral trapezoidal cube. The dimensions of each toothed support column 31 are as follows: the bottom section 311 of the inner wall of the second inner cavity 21 has a cross-sectional dimension of 12×12mm, the top section 312 near the center of the second inner cavity 21 has a cross-sectional dimension of 1×1mm, and the height is 20mm. The diameter of the first water passage 211 at the center of the second inner cavity 21 is 2mm, and the diameter of the second water passage 212 is 6mm. (4) Experimental steps: ① Set the number of columns and rows of toothed support 31 and the rotational speed of the second cylinder 2 according to the orthogonal experimental design table, and assemble the experimental device; ② Start the system, introduce air and water flow, and after running stably for 30 minutes, take a sample at the bottom outlet 13 of the first cylinder 1; ③ Detect the average particle size and the percentage of qualified bubbles in the sample, and calculate the preparation efficiency; ④ Change the parameter combination and repeat steps ①-③ to complete the testing of all orthogonal experimental groups.

[0048] Experimental results: When the toothed support column has 4 columns of 31 rows and 5 rows of 5, and the rotation speed of the second cylinder is 5000 r / min, the average particle size of the nanobubbles is ≤ 250 nm, the qualified nanobubble rate is 90% (<500 nm is considered qualified), the preparation efficiency reaches 50 L / h, and the energy consumption is 0.2 kW. h / m³; When the toothed support column has 6 columns out of 31 rows and 8 rows out of 8, and the rotation speed of the second cylinder is 10000 r / min, the average particle size of the nanobubbles is ≤ 200 nm, the qualified bubble ratio is 95% (<500 nm is considered qualified), the preparation efficiency reaches 50 L / h, and the energy consumption is 0.2 kW. h / m³; When the toothed support column has 8 columns out of 31 rows and 10 rows out of 10, and the rotation speed of the second cylinder is 15000 r / min, the average particle size of the nanobubbles is ≤ 100 nm, the qualified bubble rate is 99% (< 500 nm is considered qualified), the preparation efficiency reaches 50 L / h, and the energy consumption is 0.2 kW. h / m³; As the number of columns and rows of the toothed support pillars 31 and the rotation speed of the second cylinder 2 increase, the bubble particle size gradually decreases. When the rotation speed exceeds 10,000 r / min, the distribution of nanobubble particle size becomes more concentrated and the qualified rate of nanobubbles is higher when the energy consumption and preparation efficiency remain unchanged.

[0049] in conclusion: The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device of this application can effectively refine bubbles and achieve efficient and low-consumption preparation of air nanobubbles under optimized parameters.

[0050] Example 2: Orthogonal Experiment for the Preparation of Ozone Nanobubbles Experimental objective: The effects of different gas types (ozone) and toothed support parameters 31 on the stability and dissolved gas efficiency of nanobubbles were verified.

[0051] Experimental parameter design: (1) Independent variable: Number of rows of toothed supports 31: radially arranged along the inner circumference of the inner wall of the second inner cavity 21 (A: 6 rows, 8 rows); Number of rows of toothed supports 31: axially arranged along the inner sidewall circumference of the second inner cavity 21 (B: 8 rows, 10 rows). The second cylinder rotates at two different speeds (C: 10000 r / min, 14000 r / min). (2) Dependent variable: Average particle size of nanobubbles (μm), dissolved gas efficiency (mg / L, ozone dissolved concentration), and bubble stability (particle size change rate after 24h). (3) Fixed parameters: The inductor coil 5 has a power of 1200W, an ozone intake of 100 L / h (pressure 0.10MPa), a water intake flow of 3m³ / h, and a toothed support column 31 that is an equilateral trapezoidal cube. The dimensions of each toothed support column 31 are as follows: the bottom section 311 of the inner wall of the second inner cavity 21 has a cross-sectional dimension of 12×12mm, the top section 312 near the center of the second inner cavity 21 has a cross-sectional dimension of 1×1mm, and the height is 25mm. The diameter of the first water passage 211 at the center of the second inner cavity 21 is 3mm, and the diameter of the second water passage 212 is 8mm. (4). Experimental steps: ① Assemble the experimental apparatus and set the number of columns and rows of toothed support 31 and the rotational speed of the second cylinder 2 according to the design parameters; ② Start the system, introduce ozone gas and water flow, and after running stably for 20 minutes, take a sample at the bottom outlet 13 of the first cylinder 1; ③ Detect the average particle size of nanobubbles and the ozone dissolved concentration. After sealing the sample and placing it for 24 hours, detect the particle size again and calculate the rate of change. ④ Change the parameter combination and repeat the above steps to complete the test for all experimental groups.

[0052] Experimental results: When the toothed support column has 6 columns out of 31 rows and 8 rows out of 8, and the rotation speed of the second cylinder is 14000 r / min, the average particle size of the nanobubbles is 130 nm, the qualified bubble ratio is 99% (<500 nm is considered qualified), the nanobubble preparation efficiency is 98 L / h; the dissolved ozone concentration in the water is 3.6 mg / L, the unit water treatment energy consumption is 0.33 kW·h / m³, and the particle size change rate after 1 hour is ≤ 5%.

[0053] Comparative experiment: Using a traditional dissolved air device (with the same flow parameters), the average particle size of ozone nanobubbles is 800nm, the nanobubble preparation efficiency is ≤25L / h, the unit water treatment energy consumption is ≥1.5 kW·h / m³, and the particle size change rate is ≥50% in 1h.

[0054] in conclusion: The ozone nanobubbles prepared by the shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device of this application have smaller particle size, higher dissolved gas efficiency, and stronger stability, which are significantly better than traditional technologies and are suitable for the preparation needs of active gases such as ozone.

[0055] The above embodiments shown in this application are only part of the preferred embodiments of this application and should not be construed as limiting this application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the spirit of this application shall be within the protection scope of this application.

Claims

1. A shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device, characterized in that, include: A first cylinder with a first inner cavity is provided. The top of the first cylinder is provided with a water inlet communicating with the first inner cavity. The upper end of the side wall of the first cylinder is provided with an air inlet pipe communicating with the first inner cavity. The gas entering the first inner cavity through the air inlet pipe and the liquid entering the first inner cavity through the water inlet pipe meet vertically at the upper end of the first inner cavity, so that the upper end of the first inner cavity forms a gas-liquid mixing chamber. A second cylinder having a second inner cavity and being driven to rotate, the second cylinder being sleeved inside the first inner cavity; A shaftless multi-column tooth structure is disposed at the upper end of the inner wall of the second inner cavity and located at the lower end of the mixing cavity. It is driven by the second cylinder to rotate at high speed and is used to perform multiple rounds of gradient collision, cutting, gas dissolution, tearing and refining of the gas-liquid mixture in the mixing cavity to generate a large number of microbubbles. It includes multiple toothed pillars. The bottom of each toothed pillar is fixed on the inner wall of the second inner cavity and extends radially towards the center of the second cylinder to form a top. The radial gap between the tops of each toothed pillar forms a first water passage at the center of the second inner cavity. At least two shaftless propeller blades are disposed on the inner wall of the second inner cavity and located at the lower end of the shaftless multi-column tooth structure along the axial direction of the second inner cavity. They are driven by the second cylinder to rotate at high speed, and are used to entrain the gas-liquid mixture in the mixing chamber to form a vortex turbulence, and to further stir, break, and refine the mixture with microbubbles after being cut by the shaftless multi-column tooth structure to form a nanobubble mixture and push it out. The root of each shaftless propeller blade is fixed on the inner wall of the second inner cavity, and the tip faces the center of the second inner cavity. The radial gap between the tips of each shaftless propeller blade forms a second water passage at the center of the second inner cavity. The lower end of the first cylinder is provided with a bubble output chamber, and the bottom of the first cylinder is provided with an outlet for outputting the nanobubble mixture.

2. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 1, characterized in that, Each of the toothed support pillars is a cubic structure with the inner sidewall of the second inner cavity as its base and roughly in the shape of an equilateral trapezoid; or a pyramidal structure with a polygonal base.

3. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 1 or 2, characterized in that, Each of the toothed supports is arranged radially around the inner wall of the second inner cavity at intervals, and is arranged in layers at intervals along the inner wall of the second inner cavity at axial intervals, with the toothed supports in each layer on the same axial line; or, each of the toothed supports is arranged radially around the inner wall of the second inner cavity at intervals, and is arranged in layers at intervals along the inner wall of the second inner cavity at axial intervals, with the toothed supports in adjacent layers being axially offset.

4. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 3, characterized in that, The number of radial columns of each of the toothed struts surrounding the second inner cavity is 4-8, and the number of axial rows along the second inner cavity is 5-10.

5. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 1 or 2, characterized in that, Each of the toothed support columns is arranged radially at intervals along the second inner cavity and is spirally distributed along the circumferential surface of the inner wall of the second inner cavity.

6. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 1 or 2, characterized in that, The outer wall of the second cylinder is covered with a magnetic sleeve, and an inductor coil is fixed around the inner wall of the first cylinder, corresponding to the magnetic sleeve; the second cylinder is suspended in the first inner cavity and rotates at high speed in the first inner cavity under the magnetic drive of the inductor coil.

7. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 6, characterized in that, Sealed bearings are provided at both ends of the inductor coil along the axial direction. The outer rings of the two sealed bearings are fixed to the inner wall of the first cylinder, and the inner rings are fixed to the two outer ends of the second cylinder along the axial direction, rotating with the second cylinder.

8. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 6, characterized in that, It also includes an electronic speed controller, which is electrically connected to the inductor coil.

9. The shaftless suction-type multi-column gradient cutting dissolved gas nanobubble preparation device according to claim 6, characterized in that, The second cylinder rotates at a speed of 5000-15000 r / min, and the inductor coil has a power of 500W-3000W.

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