Hybrid asymmetric micro-nano bubble generation device and method

Abstract

The invention relates to the technical field of water treatment, and discloses a mixed asymmetric micro-nano bubble generation device and method.The mixed asymmetric micro-nano bubble generation device comprises a water supply pipeline provided with a water supply contraction section, a water supply throat section and a water supply expanding section, and the outer side of the water supply throat section is connected with an air supply mechanism communicating with the water supply throat section; the communication positions of at least two of the air supply mechanisms and the water supply throat section are arranged in a staggered manner in the length direction of the water supply pipeline; and the outer side of the water supply throat section is connected with a magnetization cutting mechanism by avoiding the air supply mechanism. The problems that in the prior art, a micro-nano bubble generation device is poor in breaking capacity and poor in bubble generation uniformity are solved.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a hybrid asymmetric micro / nano bubble generator and method. Background Technology

[0002] Micro- and nanobubble technology generates extremely small bubbles with diameters ranging from tens of micrometers to hundreds of nanometers in liquids, resulting in a geometrical increase in the gas-liquid contact area per unit volume. This significantly improves the mass transfer efficiency and solubility of gases such as oxygen and ozone in water. Simultaneously, the generated micro- and nanobubbles rise extremely slowly in water, remaining submerged for hours or even days. Furthermore, their negatively charged surfaces allow them to absorb positively charged suspended particles, oil droplets, and other pollutants. Due to their unique physicochemical properties, micro- and nanobubbles are widely used in water oxygenation and ecological restoration, treatment of recalcitrant organic wastewater, disinfection and sterilization, and removal of suspended solids, oils, algae, and heavy metal ions from water. They show particularly promising applications in environmental pollution control, including wastewater treatment and groundwater and soil remediation.

[0003] Currently, there are many methods for generating micro and nanobubbles, mainly including physical methods, chemical methods, and ultrasonic treatment. Among them, generating micro and nanobubbles using a Venturi tube is a common and important method. The principle is to set up a Venturi tube structure with a contraction section, a throat section, and an expansion section. The throat section is much narrower than the contraction and expansion sections. When water flows from the contraction section through the throat and expansion sections in sequence, the flow velocity of the water increases dramatically in the narrow throat section. According to Bernoulli's principle, the pressure in the throat section decreases, creating a negative pressure effect. By connecting a trachea at the throat section, the negative pressure can be used to draw gas into the throat section and mix it with the liquid. When the gas and liquid are mixed and flow from the throat section to the expansion section, the high-speed turbulence generates a strong shear force on the drawn-in gas, tearing and breaking up large bubbles, which are finally precipitated and nucleated in the expansion section to obtain micro and nanobubbles.

[0004] While venturi tube structures can generate micro- and nano-bubbles, in practical applications, the generated bubbles tend to be large, primarily in the micrometer range, making it difficult to produce nano-sized bubbles and thus failing to meet practical needs. Furthermore, existing venturi tube micro- and nano-bubble generators suffer from issues with air volume and bubble uniformity. Therefore, it is necessary to improve existing micro- and nano-bubble generators to enhance their ability to break up and improve the uniformity of the generated micro- and nano-bubbles. Summary of the Invention

[0005] The present invention aims to provide a hybrid asymmetric micro / nano bubble generator and method to solve the problems of poor breaking ability and poor bubble uniformity in existing micro / nano bubble generators.

[0006] To solve the above problems, the present invention adopts the following technical solution: a hybrid asymmetric micro-nano bubble generator, comprising a water supply pipe having a water supply contraction section, a water supply throat section, and a water supply expansion section, wherein an air supply mechanism is connected to the outside of the water supply throat section and communicates with the water supply throat section, the number of air supply mechanisms is at least two, and at least two of the air supply mechanisms are staggered from the water supply throat section along the length of the water supply pipe; a magnetized cutting mechanism is connected to the air supply mechanism on the outside of the water supply throat section.

[0007] The principle of this solution is as follows: The water supply pipeline in this application has a water supply contraction section, a water supply throat section, and a water supply expansion section. According to Bernoulli's principle, when water flows through the water supply pipeline, a Venturi effect will occur, the flow velocity of the water will increase dramatically and a negative pressure will be formed. Under the negative pressure of the water supply throat section, the gas of the gas supply mechanism will be automatically drawn in and mixed with the water flow. When the gas and liquid phases flow from the water supply throat section to the water supply expansion section, the high-speed turbulence will generate a strong shear force on the gas drawn in, tearing large bubbles into small bubbles. Finally, the fluid enters the water supply expansion section, where the flow velocity gradually decreases and the pressure gradually recovers, causing the supersaturated gas in the water to precipitate and nucleate in the form of microbubbles, ultimately producing a large number of micro-nano bubbles. At the same time, in this application, a magnetized cutting mechanism is connected to the gas supply mechanism on the outside of the water supply throat section. The magnetized cutting mechanism is used to enhance the bubble breaking force and reduce the surface tension, thereby improving the gas-liquid interface, reducing mechanical cutting energy consumption, and extending the bubble residence time.

[0008] Furthermore, in this application, the number of gas supply mechanisms is at least two. This allows gas to be drawn in simultaneously from different gas supply mechanisms when a negative pressure is generated in the water supply pipe section. Compared to the conventional method of setting only one gas supply mechanism in the prior art, this not only increases the amount of gas drawn in and the gas-liquid contact area, but more importantly, the positions where at least two gas supply mechanisms are connected to the water supply pipe section in this application are staggered along the length of the water supply pipe. That is, when the water flows through the water supply pipe section, it can receive gas from at least two different gas supply mechanisms in succession, forming an asymmetrical structure. This allows the rapidly flowing water to come into contact with the gas in succession multiple times, improving the disturbance effect on the water flow and making the gas-liquid mixture more uniform. In addition, better bubble breaking effect is obtained during the mixing process, making more sufficient preparation for the subsequent generation of more and more uniform bubbles.

[0009] The beneficial effects of this invention are as follows: 1. Improved uniformity of gas-liquid mixing: Compared to conventional Venturi tube structures in existing technologies that only have one gas supply mechanism, resulting in a single gas supply method and limited gas supply volume, this application firstly incorporates at least two gas supply mechanisms. This increased number of mechanisms allows for the supply of a larger volume of gas during the gas supply process, while simultaneously extending the contact time between the gas and water flow, leading to more thorough gas-liquid contact and thus improving the uniformity of gas-liquid mixing. Furthermore, in this application, the at least two gas supply mechanisms are staggered in the direction of water flow, allowing different mechanisms to supply gas sequentially at different locations. This not only enhances the gas-liquid contact and mixing effect but also creates secondary or even multiple shearing processes, resulting in more uniform gas-liquid mixing and improved micro / nano bubble generation.

[0010] 2. Improved Bubble Breaking Effect: Compared to existing technologies that rely solely on Venturi tubes to generate micro / nano bubbles, the breaking effect is generally poor, producing mainly micron-sized bubbles and failing to generate a large number of nano-sized bubbles. This application addresses this by setting multiple air supply mechanisms, with at least two staggered along the water flow direction, resulting in more uniform gas-liquid mixing and increased complexity of the turbulent vortices at the water supply throat. Furthermore, a magnetized cutting mechanism is installed on the outside of the water supply throat, utilizing the magnetic field to enhance bubble breaking, disrupting hydrogen bonds in water molecules, and transforming large molecular clusters into smaller ones. This ultimately leads to a better breaking effect, reduced fluctuations in bubble breaking, and the generation of a large number of micro / nano bubbles.

[0011] 3. Reduced energy consumption of mechanical cutting: By adopting the technical solution in this application, a large number of micro-nano bubbles can be obtained by combining multiple air supply mechanisms and magnetized cutting mechanisms, and the average particle size of the bubbles can be reduced. While achieving the same mixing effect or bubble particle size as in the prior art, the dependence of bubbles on mechanical cutting can be effectively reduced, the inlet pressure can be reduced, and the energy consumption of the water pump can be reduced, thereby indirectly reducing costs.

[0012] 4. Extending bubble residence time: The technical solution in this application, which combines multiple gas supply mechanisms and a magnetized cutting mechanism, can effectively reduce surface tension, increase the gas-liquid interface (i.e., increase specific surface area), increase the wettability of bubbles, and form a bubble liquid that is easy to disperse and not easy to aggregate; at the same time, it increases the electrostatic repulsion effect, extends the bubble residence time, and fully releases dissolved oxygen.

[0013] Preferably, as an improvement, the gas supply mechanism includes a gas supply pipe, and the gas supply pipes of all gas supply mechanisms are evenly arranged along the circumference of the water supply throat section. A sealing unit that cooperates with all gas supply pipes is connected in the water supply throat section. The sealing unit and the end of the gas supply pipe near the water supply throat section form an air inlet. At least two of the air inlets are staggered along the length of the water supply pipe.

[0014] In this solution, by cooperating with all water supply pipes, the air inlets at the end of the water supply pipe connected to the water supply throat section are staggered along the length of the water supply pipe (i.e., the direction in which the water flows through the water supply throat section). When the water flows through the water supply throat section and produces a Venturi effect, gas can be automatically drawn in from all the air inlets. The sealing unit has a simple structure and is easy to install.

[0015] In particular, in this scheme, since the air supply pipes are evenly arranged along the axial direction of the water supply throat section, the air inlets are arranged along the circumference of the water supply throat section under the action of the sealing unit, and are staggered along the flow direction of the water in the water supply throat section. Therefore, during the air supply process, multiple air inlets can supply air to the water supply throat section at different positions and in different directions, which can not only form secondary or multiple shearing, but also the shearing directions are different, which can improve the uniformity of gas and water mixing.

[0016] Meanwhile, each air inlet generates vortices in the water flow when air is introduced. The vortices generated by air inlets in different directions have different directions. Multiple air inlets are staggered along the water flow direction. When the air inlets first mix with the water flow, they can generate vortices and mix quickly and evenly with the water flow. In the entire water supply throat section, the vortices generated by different air inlets in different directions can cancel each other out, ultimately reducing vortices and producing an anti-deviation flow effect, reducing head loss, and improving the stability of fertilizer absorption, injection, and flow measurement in the water treatment process.

[0017] In addition, this solution arranges the air supply pipes evenly along the circumference of the water supply throat section, which not only makes the entire device symmetrical and aesthetically pleasing, but also avoids multiple air supply pipes being misaligned on the water supply throat section, while ensuring that the air supply pipes can supply air from different positions in the direction of water flow. Instead, it uses a blocking unit to control the air inlets of different air supply pipes. Even if the length of the water supply throat section is very small, multiple misaligned air inlets can be arranged conveniently and stably to meet the space requirements.

[0018] Preferably, as an improvement, the air supply pipe has an air supply contraction section, an air supply throat section, and an air supply expansion section, with the air supply expansion section connected to the water supply throat section.

[0019] In this design, the gas supply pipe is also designed as a Venturi structure. When the gas is drawn into the water supply throat, the gas velocity increases, which allows for more intense mixing with the liquid in the water supply throat, increasing the complexity of the turbulent vortex and thus further improving the uniformity of gas-liquid mixing.

[0020] Preferably, as an improvement, the sealing unit includes a front sealing part and a rear sealing part. The front sealing part is detachably connected to the connection position between the water supply contraction section and the water supply throat section, and the rear sealing part is connected to the connection position between the water supply throat section and the water supply expansion section. The front sealing part and the rear sealing part form an air passage gap with a number equal to and corresponding to the number of air inlets.

[0021] In this solution, the connection between the front-end sealing section and the water supply contraction section and the water supply throat section is detachable. When the front-end sealing section is damaged after long-term use, it can be easily replaced to ensure that the front-end sealing section and the rear-end sealing section can accurately and stably form the corresponding number of air gaps, so that all air supply pipes can stably and accurately supply gas.

[0022] Preferably, as an improvement, the front-end sealing part includes a front-end sealing ring, the outer side of which is adapted to the connection position of the water supply contraction section and the water supply throat section, and the inner side of the front-end sealing ring is provided with a water supply disturbance part.

[0023] The front-end sealing section in this design is a ring-shaped structure, allowing the outer side of the front-end sealing ring to be easily adapted and connected to the water supply contraction section and the water supply throat section. In addition, this design includes a water supply disturbance section on the front-end sealing ring. When water flows through the front-end sealing ring into the water supply throat section, the water supply disturbance section will pre-disturb the water flow, enhancing the turbulence effect of the water flow in the water supply throat section, allowing the water flow to have more complete contact with the gas, and improving the mixing uniformity.

[0024] Preferably, as an improvement, the front sealing ring has multiple front sealing rings, and the water supply disturbance part on different front sealing rings has different specifications. All front sealing rings are selected to be connected at the connection position between the water supply contraction section and the water supply throat section. Different front sealing rings are provided with water supply disturbance parts of different specifications, and different front sealing rings and rear sealing parts form air gaps of different widths.

[0025] This solution uses multiple front-end sealing rings. During use, one ring is selected and connected to the water supply pipe. The connected front-end sealing ring cooperates with the rear-end sealing section to form an air gap that mates with all water supply pipes. Furthermore, the water supply disturbance section on the front-end sealing ring has different specifications, each with varying intensity of water flow disturbance. The air gaps formed by different front-end sealing rings and the throat sealing section have varying widths, which can change the air inlet cross-sectional area, thereby altering the air intake velocity of the air supply pipe. Combined with the disturbance effect of the water supply disturbance section on the water flow, for example, when a large number of small bubbles need to be generated, a front-end sealing ring with high disturbance intensity and a large air inlet cross-sectional area can be used to increase water flow disturbance and air intake. Conversely, when producing bubbles with relatively low requirements, a front-end sealing ring with lower disturbance intensity can be selected to reduce energy consumption and equipment consumption while meeting production needs.

[0026] Preferably, as an improvement, the water supply disturbance section includes several stepped disturbance steps, with the inner diameter of the disturbance steps decreasing sequentially from the water supply contraction section to the water supply throat section, and the end of the front sealing ring near the water supply contraction section smoothly transitions to the inner wall of the water supply contraction section.

[0027] In this design, the water supply disturbance section is set as several steps, which can be easily processed into a stepped structure on the inner side of the front sealing ring. The stepped structure can effectively disturb the water flow, improve the turbulent vortex effect after the water flows into the water supply throat section, and make the water flow and gas mix more fully and evenly. In addition, the end of the front sealing ring near the water supply contraction section transitions smoothly with the inner wall of the water supply contraction section, so that the water in the water supply contraction section can flow smoothly to the water supply throat section, ensuring the overall structural stability.

[0028] Preferably, as an improvement, the rear end sealing part includes a rear end sealing ring, the middle of the inner wall of the rear end sealing ring protrudes into the water supply pipe, and the end of the rear end sealing ring near the water supply expansion section smoothly transitions with the inner wall of the water supply expansion section.

[0029] In this design, the inner wall of the rear sealing ring protrudes into the water supply pipe, making the throat of the water supply throat section narrower after the rear sealing ring is installed. This results in a faster flow rate after the water and gas come into contact and mix, leading to more intense mixing and further improving the gas-liquid mixing effect. In addition, the end of the rear sealing ring near the water supply expansion section is designed to smoothly transition with the inner wall of the water supply expansion section, facilitating the generation of intense shear force from high-speed turbulent gas-liquid flow. The flow rate can then gradually decrease, stabilizing the generation of a large number of micro-nano bubbles.

[0030] Preferably, as an improvement, the magnetized cutting mechanism includes several electromagnetic groups arranged circumferentially along the outer side of the water supply pipe, and each electromagnetic group includes two magnetic cores symmetrically arranged along the central axis of the water supply pipe.

[0031] The magnetized cutting mechanism in this solution includes multiple electromagnetic groups. When in use, energizing each magnetic core generates a magnetic field, which enhances the bubble breaking effect on the liquid and gas in the water supply pipe section, improves the generation effect of micro-nano bubbles, and the electromagnetic group can generate a stable magnetic field for a long time compared with permanent magnets, effectively ensuring the stability of magnetized cutting.

[0032] A method for generating hybrid asymmetric micro / nano bubbles includes a hybrid asymmetric micro / nano bubble generating device. The micro / nano bubble generation process is as follows: water flows sequentially from the water supply contraction section of a water supply pipe to the water supply throat section and then to the water supply expansion section. At the water supply throat section, the flow velocity increases while the pressure decreases, generating strong turbulence. Gas from the gas supply mechanism is drawn into the gas supply throat and rapidly mixes with the water flow to form a highly efficient and uniformly mixed gas-liquid two-phase mixture. At least two gas supply mechanisms are staggered along the length of the water supply pipe, which increases the complexity of the turbulent vortex while supplying gas to the water supply throat section, further improving the uniformity of gas-liquid mixing and reducing fluctuations in bubble breakage effect. At the same time, a magnetized cutting mechanism forms a high-intensity magnetic field region, generating additional shearing and disturbance on the mixed gas-liquid two-phase mixture. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a hybrid asymmetric micro / nano bubble generator according to Embodiment 1 of the present invention.

[0034] Figure 2 for Figure 1 A cross section.

[0035] Figure 3 for Figure 1 A schematic diagram showing the concealed outer protective sleeve and end cap.

[0036] Figure 4 This is a schematic diagram of the magnetic core connected to the outside of the water supply pipe in Embodiment 1 of the present invention.

[0037] Figure 5 This is a cross-sectional view of a hybrid asymmetric micro / nano bubble generator according to Embodiment 3 of the present invention. Detailed Implementation

[0038] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: water supply pipe 1, water supply contraction section 101, slot 1011, water supply throat section 102, water supply expansion section 103, lock hole 1031, air supply pipe 2, air inlet 3, front sealing ring 4, disturbance step 401, rear sealing ring 5, threaded hole 501, iron core 6, coil winding 7, outer protective sleeve 8, end cover 9, and partition block 10. Example

[0039] Example 1 Figure 1 and Figure 2As shown, a hybrid asymmetric micro / nano bubble generator includes a water supply pipe 1 having a water supply contraction section 101, a water supply throat section 102, and a water supply expansion section 103. An air supply mechanism is connected to the outside of the water supply throat section 102 and communicates with it. The number of air supply mechanisms is at least two, and at least two of the air supply mechanisms are staggered along the length of the water supply pipe 1, so that at least two different positions along the length of the water supply throat section 102 can supply gas. Specifically, this embodiment uses two air supply mechanisms as an example, with the two air supply mechanisms located on the upper and lower sides of the water supply pipe 1, respectively, and staggered in the lateral direction. In other embodiments besides this one, the number of air supply mechanisms can be more, such as six. The six air supply mechanisms can be divided into two groups, with three air supply mechanisms in each group evenly distributed along the circumference of the water supply throat section 102, and the two groups of air supply mechanisms spaced apart along the length of the water supply pipe 1.

[0040] To ensure a symmetrical and aesthetically pleasing appearance of the entire device and to prevent significant impact on the water supply pipeline 1 during gas supply, the gas supply mechanism in this embodiment includes a gas supply pipe 2 connected to the water supply throat section 102. Two gas supply pipes 2 are symmetrically arranged vertically along the water supply pipeline 1. A sealing unit, which cooperates with all gas supply pipes 2, is connected within the water supply throat section 102. The sealing unit and the end of the gas supply pipe 2 closest to the water supply throat section 102 form an air inlet 3, and the two air inlets 3 are staggered along the length of the water supply pipeline 1. To enhance the flow complexity during gas supply, this embodiment includes a gas supply contraction section, a gas supply throat section, and a gas supply expansion section on the gas supply pipe 2, enabling the gas supply pipe 2 to also achieve a Venturi effect. The distance of the gas supply expansion section is less than or equal to 5 mm, allowing the gas to accelerate and directly enter the water supply pipeline 1. Further details are omitted here.

[0041] Combination Figure 1 and Figure 2To facilitate the formation of a stable air inlet 3 between the sealing unit and the air supply pipe 2, the sealing unit in this embodiment includes a front sealing part and a rear sealing part. The front sealing part is detachably connected to the connection position between the water supply contraction section 101 and the water supply throat section 102, and the rear sealing part is connected to the connection position between the water supply throat section 102 and the water supply expansion section 103. The front sealing part and the rear sealing part form an air passage gap that is equal in number and corresponds one-to-one with the number of air inlets 3. Specifically, the front-end sealing part includes a ring-shaped front-end sealing ring 4. The outer side of the front-end sealing ring 4 is adapted to the connection position of the water supply contraction section 101 and the water supply throat section 102. For convenient and stable connection and fixation, the outer wall of the right end of the front-end sealing ring 4 is set to fit against the inner wall of the water supply contraction section 101. That is, the cone angle of the outer wall of the front-end sealing ring 4 is the same as the cone angle of the inner wall of the water supply contraction section 101. Furthermore, a snap protrusion is integrally formed on the outer wall of the front-end sealing ring 4, and a slot 1011 is integrally formed on the inner wall of the water supply contraction section 101 to engage with the snap protrusion. When installing the front-end sealing ring 4, the front-end sealing ring 4 is inserted into the water supply contraction section 101 along the left side, and the snap protrusion is inserted into the slot 1011, so that the front-end sealing ring 4 is stably installed and fixed. In this embodiment, a water supply disturbance part for disturbing the water flow is provided on the inner side of the front sealing ring 4. The water supply disturbance part includes a disturbance step 401 integrally formed on the inner side of the front sealing ring 4. From the water supply contraction section 101 to the water supply throat section 102 (i.e., the flow direction of water in the water supply pipe 1), the inner diameter of the disturbance step 401 decreases sequentially. Figure 2 The number of disturbance steps 401 in the water supply disturbance section of the front sealing ring 4 is two. In other embodiments besides this embodiment, the number of disturbance steps 401 can be appropriately determined according to the size of the water supply contraction section 101 and the water supply throat section 102. At the same time, the ratio of the height H and the width D of each step in the disturbance step 401 is D:H=(1.2~2):1, preferably D:H=1.5:1. Furthermore, the end of the front sealing ring 4 near the water supply contraction section 101 has a smooth transition with the inner wall of the water supply contraction section 101, so that the water flow in the water supply contraction section 101 can flow stably into the front sealing ring 4.

[0042] Combination Figure 1 and Figure 2The rear sealing part includes a rear sealing ring 5. The middle of the inner wall of the rear sealing ring 5 protrudes inward towards the interior of the rear sealing ring 5. The end of the rear sealing ring 5 near the water supply expansion section 103 smoothly transitions with the inner wall of the water supply expansion section 103. To facilitate stable installation and fixation of the rear sealing ring 5, in this embodiment, the outer wall of the rear sealing ring 5 is set to have the same taper as the inner wall of the water supply expansion section 103. At the same time, a locking hole 1031 is opened on the outer wall of the water supply pipe 1, and a blind-hole-shaped threaded hole 501 is opened on the outer wall of the rear sealing ring 5. In addition, for assembly accuracy, a structure with the aforementioned locking protrusion and locking groove 1011 can be provided between the outer wall of the rear sealing ring 5 and the water supply expansion section 103, which will not be described in detail here.

[0043] Combination Figure 2 , Figure 3 and Figure 4 In this embodiment, a magnetized cutting mechanism is provided on the outer side of the water supply throat section 102, which is adjacent to the air supply pipe 2. The magnetized cutting mechanism in this embodiment includes multiple electromagnetic groups arranged circumferentially along the outer side of the water supply throat section 102. Each electromagnetic group includes two magnetic cores symmetrically arranged along the central axis of the water supply throat section 102. The magnetic core includes an iron core 6 and a coil winding 7 wrapped around the iron core 6. When in use, an alternating current is passed through the magnetic core to generate an alternating magnetic field, which can generate additional shearing and disturbance to the gas and liquid phases in the water supply throat section 102. Figure 4 The illustration shows a configuration with three electromagnetic groups. In other embodiments besides this one, the number of electromagnetic groups and the size range of the coil windings 7 can be determined based on the magnetic cutting intensity requirements and the size of the water supply pipe 1, which will not be elaborated here. Meanwhile, to ensure efficient and stable operation of the electromagnetic groups, an outer protective sleeve 8 is fixedly connected to the outside of the electromagnetic groups by screws in this embodiment. One end of the outer protective sleeve 8 is welded to the water supply pipe 1, and the other end of the outer protective sleeve 8 is fixedly connected to an end cap 9 by screws. A spacer block 10 is also provided between adjacent magnetic cores.

[0044] A method for generating hybrid asymmetric micro / nano bubbles, comprising the aforementioned hybrid asymmetric micro / nano bubble generating device, wherein the micro / nano bubble generation process is as follows: First, the water flows sequentially from the water supply contraction section 101 of the water supply pipe 1 to the water supply throat section 102 and the water supply expansion section 103. When the water flows from the water supply contraction section 101 to the water supply throat section 102, according to Bernoulli's principle, the flow velocity increases and the pressure decreases at the water supply throat section 102, generating strong turbulence. Moreover, in this embodiment, a front sealing ring is provided between the water supply contraction section 101 and the water supply throat section 102, and a disturbance step 401 is provided on the inner side of the front sealing ring. When the water flows through the disturbance step 401, it will be disturbed by the disturbance step 401, so that when the water flows into the water supply throat section 102, not only does the flow velocity increase, but turbulent vortices are also generated.

[0045] Under strong negative pressure, the air supply pipe 2 connected to the water supply throat section 102 supplies air into the water supply throat section 102. The inhaled gas mixes rapidly with the water flow, forming a highly efficient and uniformly mixed gas-liquid two-phase mixture. Since there are two air supply pipes 2 in this embodiment, and under the connection and control of the front sealing ring 4 and the rear sealing ring 5, when the two air supply pipes 2 supply air to the water supply throat section 102, the two air inlets 3 are located on the upper and lower sides of the water supply throat section 102 respectively, and the two air inlets 3 are staggered in the lateral direction. Therefore, when the water supply throat section 102 receives gas, it can receive gas from the two air inlets 3 at different positions one after the other, so that the supplied gas can mix with the water flow more quickly and evenly. At the same time, it can also increase the complexity of the water flow turbulence vortex, further improve the uniformity of gas-liquid mixing and reduce the fluctuation of bubble breaking effect. The setting of two air inlets 3 ensures that sufficient gas can be supplied to the water flow, providing a guarantee for obtaining a large number of bubbles in the future.

[0046] At the same time, an alternating current is passed through the electromagnetic assembly, so that the magnetic core forms a high-intensity alternating magnetic field at the water supply throat section 102. The alternating magnetic field generates additional shearing and disturbance to the mixed gas and liquid phases. Moreover, the magnetic core is set along the length of the water supply throat section 102, which can help to enhance the bubble breaking force, reduce surface tension, and improve the gas-liquid interface.

[0047] Finally, the gas and liquid phases enter the water supply expansion section 103 from the water supply throat section 102. At this time, the flow rate of the gas and liquid phases gradually decreases and the pressure gradually recovers. Strong shearing occurs between the high-speed fluid and the relatively low-speed fluid, which stretches and tears the bubbles to form a large number of micro and nano bubbles. Moreover, the pressure of the gas and liquid phases also changes rapidly during this process, inducing local cavitation and generating micro bubbles, resulting in a large number of micro and nano bubbles in the water flow.

[0048] Comparative Example 1: Compared with Example 1, the same water supply pipe 1 (i.e., the water supply contraction section 101, water supply throat section 102 and water supply expansion section 103 have the same size specifications) is used. The difference is that only one conventional air supply pipe 2 is set in Comparative Example 1.

[0049] Comparative Example 2: The difference between Comparative Example 2 and Comparative Example 1 is that Comparative Example 2 is provided with two air supply pipes 2, and the water supply pipe 1 is provided with the same sealing unit structure as in Example 1. The two air supply pipes 2 and the sealing unit are set up in the same way as in Example 1. The only difference from Example 1 is that the magnetized cutting mechanism is not provided.

[0050] Comparative Example 3: The difference between Comparative Example 3 and Comparative Example 1 is that a magnetized cutting mechanism is provided on the outside of the water supply pipe 1. The setting of the magnetized cutting mechanism is the same as in Example 1. The test results of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 are shown in Table 1: category Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Average diameter of micro / nano bubbles / μm 5~50μm 2~20μm 3~30μm 0.5~10μm Particle size distribution width Coefficient of variation > 30% Coefficient of variation: 20%–30% Coefficient of variation: 20%–28% Coefficient of variation <20% Gas dissolution efficiency 30%～50% 50%～70% 45%～65% 70%～90% Target gas concentration (taking oxygen as an example) 5–10 mg / L 8~15mg / L 7~13mg / L 12~20mg / L Bubble half-life / stability 10-30 minutes 30-60 minutes 25-50 minutes 60-120 minutes Table 1 According to the test results in Table 1, the performance of all parameters in Example 1 is lower than that of other comparative examples and Example 1. Therefore, it can be concluded that whether it is the method of adding a magnetized cutting mechanism or the method of setting multiple air supply pipes 2 and setting the air supply pipes 2 and the water supply throat section 102 in staggered positions (i.e., setting an asymmetric air inlet 3 structure on the water supply throat section 102), the quality of micro-nano bubble generation can be improved. Moreover, through the comparison of Example 1, Comparative Example 2 and Comparative Example 3, it can be seen that the combination of the magnetized cutting mechanism and the asymmetric air inlet 3 on the water supply throat section 102 results in the smallest average diameter of micro-nano bubbles, the smallest particle size distribution width, the highest gas dissolution efficiency, the highest target gas concentration and the best stability. Therefore, adopting this solution can effectively improve the micro-nano bubble generation effect. Example

[0051] The difference between Embodiment 2 and Embodiment 1 is as follows: In Embodiment 1, the front-end sealing part includes a front-end sealing ring 4, which is fixed inside the water supply pipe 1 during use. In this embodiment, there are multiple front-end sealing rings 4, preferably 3 to 5. One of the front-end sealing rings 4 is selected and fixed inside the water supply pipe 1 during use. Furthermore, the specifications of the water supply disturbance parts on different front-end sealing rings 4 are different, resulting in different disturbance intensity of the water flow by each front-end sealing ring 4. Specifically, the different specifications in this embodiment refer to the different lengths and heights of the disturbance steps 401 on different front-end sealing rings 4. For example, the length of the disturbance step 401 on one front-end sealing ring 4 is 5mm and the height is 3mm, while the length of the disturbance step 401 on another front-end sealing ring 4 with different specifications is 4mm and the height is 2mm. The longer and higher the disturbance step 401 is, the greater the disturbance intensity of the water flow. Different front-end sealing rings 4 and rear-end sealing rings 5 ​​can form air gaps of different widths. The greater the disturbance intensity of the disturbance step 401 on the front-end sealing ring 4, the larger the air gap formed by the front-end sealing ring 4 and the rear-end sealing ring 5. When the disturbance intensity of the disturbance step 401 on the front-end sealing ring 4 on the water flow is stronger, the air gap formed is larger. The air inlet 3 can supply a larger amount of gas to the water supply throat section 102 so that a sufficient amount of gas can be supplied quickly and a larger amount of micro-nano bubbles can be obtained.

[0052] In this embodiment, multiple front-end sealing rings 4 are set. When using them, the appropriate front-end sealing ring 4 can be selected according to actual needs. For example, when a larger amount of micro-nano bubbles are needed in sewage treatment, a front-end sealing ring 4 with greater disturbance strength can be installed to generate a large number of micro-nano bubbles with better performance parameters. In the case of water oxygenation, a front-end sealing ring 4 with smaller disturbance strength can be used to reduce energy consumption and other costs. Example

[0053] The difference between Example 3 and Example 2 is that in Example 2, when the air inlet 3 is set, the direction of the air inlet 3 is always along a direction perpendicular to the water supply pipe 1. For example... Figure 5 As shown, in this embodiment, when the air inlet 3 is set, the air inlet 3 located at the bottom of the water supply throat section 102 is perpendicular to the water supply pipe 1. The air inlet 3 located at the top of the water supply throat section 102 has an air intake direction that is along the water flow direction in the water supply throat section 102 and forms an angle with the water supply throat section 102. The angle θ is in the range of 18 to 25°, and is preferably 20° in this embodiment.

[0054] In this embodiment, the air inlet 3 near the bottom of the water supply throat section 102 is set to be perpendicular to the water supply pipe 1. When gas enters through the air inlet 3 at the bottom of the water supply throat section 102, the gas enters the water supply throat section 102 vertically, and the airflow direction is opposite to the direction of gravity. During the upward ejection of the airflow, an axial upward airflow channel is formed. On the one hand, solid impurities tend to sink under the influence of gravity, and the vertical upward airflow can form an upward entrainment force on the impurities, preventing impurities from depositing and clogging the inlet near the air inlet. On the other hand, the cross-sectional shape of the vertical flow channel is regular, and there is no "dead corner" area as in horizontal or inclined arrangements, so the resistance encountered by impurities when moving with the airflow is smaller. It can be more smoothly carried into the main channel by the airflow and discharged with the fluid. Solid impurities can easily pass through, which can effectively reduce clogging. It is especially suitable for the generation of micro-nano bubbles in sewage or irrigation water containing suspended solids. In addition, by setting the air inlet 3 at the top of the water supply throat section 102 to an inclined state, the air inlet 3 at the top of the water supply throat section 102 can generate a vortex at the top of the water flow after entering the water supply throat section 102. Combined with the vortex generated on the water flow when the air is introduced into the water supply throat section 102 by the air inlet 3 at the bottom of the water supply throat section 102, the vortices generated at the top and bottom are opposite to each other. When the gas can quickly mix with the water flow, it can ultimately weaken the vortex and reduce the head loss, thereby improving the stability of fertilizer absorption, injection and flow measurement.

[0055] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A mixed asymmetric micro-nano bubble generating device, comprising a water supply pipeline having a water supply contraction section, a water supply throat section and a water supply expansion section, and a gas supply mechanism connected outside the water supply throat section and in communication with the water supply throat section, characterized in that: The number of the air supply mechanisms is at least two, and the communication positions of at least two air supply mechanisms with the water supply throat section are staggered along the length direction of the water supply pipeline; the outside of the water supply throat section is connected with the magnetized cutting mechanism.

2. The hybrid asymmetric micro-nano bubble generating device according to claim 1, wherein: The air supply mechanism comprises an air supply pipe, and the air supply pipes of all air supply mechanisms are uniformly arranged along the circumference of the water supply throat section; the water supply throat section is connected with a blocking unit matched with all air supply pipes; the blocking unit and the air supply pipe close to the water supply throat section form an air inlet; and at least two air inlets are staggered along the length direction of the water supply pipeline.

3. The hybrid asymmetric micro-nano bubble generating device according to claim 2, wherein: The air supply pipe has an air supply contraction section, an air supply throat section and an air supply expansion section, and the air supply expansion section is communicated with the water supply throat section.

4. The hybrid asymmetric micro-nano bubble generating device according to claim 2, wherein: The blocking unit comprises a front end blocking part and a rear end blocking part; the front end blocking part is detachably connected with the connection position of the water supply contraction section and the water supply throat section; and the rear end blocking part is connected with the connection position of the water supply throat section and the water supply expansion section; the front end blocking part and the rear end blocking part form air passing gaps equal in number to the air inlets and one-to-one corresponding.

5. The hybrid asymmetric micro-nano bubble generating device according to claim 4, wherein: The front end blocking ring has a plurality of front end blocking rings, and the water disturbance parts on different front end blocking rings are different in specification; all front end blocking rings are alternatively connected with the connection position of the water supply contraction section and the water supply throat section; different front end blocking rings are provided with different specifications of water disturbance parts; and different front end blocking rings and the rear end blocking part form air passing gaps different in width.

6. The hybrid asymmetric micro-nano bubble generating device according to claim 5, wherein: The water disturbance part comprises a plurality of stepped disturbance steps; from the water supply contraction section to the water supply throat section, the inner diameter of the disturbance step is sequentially reduced; and the end of the front end blocking ring close to the water supply contraction section and the inner wall of the water supply contraction section are smoothly connected.

7. The hybrid asymmetric micro-nano bubble generating device according to claim 6, wherein: The rear end blocking part comprises a rear end blocking ring; the inner wall of the rear end blocking ring is protruded to the inside of the water supply pipeline; and the end of the rear end blocking ring close to the water supply expansion section and the inner wall of the water supply expansion section are smoothly connected.

8. The hybrid asymmetric micro-nano bubble generating device according to claim 4, wherein: The magnetized cutting mechanism comprises a plurality of electromagnetic groups arranged along the circumference of the outside of the water supply throat section; each electromagnetic group comprises two magnetic cores arranged symmetrically along the central axis of the water supply throat pipe.

9. The hybrid asymmetric micro-nano bubble generating device according to claim 1, wherein: The mixed asymmetric micro-nano bubble generating device comprises a water supply pipeline, a water supply contraction section, a water supply throat section, a water supply expansion section, an air supply mechanism, a blocking unit and a magnetized cutting mechanism; the water supply contraction section is connected with the water supply throat section; the water supply throat section is connected with the water supply expansion section; the air supply mechanism is connected with the water supply throat section; the blocking unit is connected with the water supply contraction section and the water supply throat section; and the magnetized cutting mechanism is connected with the water supply throat section; the water flow flows from the water supply contraction section to the water supply throat section and the water supply expansion section in sequence; the flow rate is increased and the pressure is reduced at the water supply throat section, and strong turbulence is generated; the gas of the air supply mechanism is sucked to the air supply pipe and rapidly mixed with the water flow to form a high-efficiency and uniform gas-liquid two-phase; the communication positions of at least two air supply mechanisms with the water supply throat section are staggered along the length direction of the water supply pipeline, so that the air supply mechanism supplies gas to the water supply throat section and improves the complexity of the turbulence vortex, further improves the uniformity of the gas-liquid mixing and reduces the fluctuation of the bubble breaking effect; at the same time, the magnetized cutting mechanism forms a high-strength magnetic field region to generate additional shear and disturbance to the mixed gas-liquid two-phase.

10. A hybrid asymmetric micro-nano bubble generating method, characterized by: ​

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