Micro-nano bubble generator

Abstract

The utility model provides a micro-nano bubble generator. The micro-nano bubble generator comprises three units, the first unit is one or a group of premixing nozzles and is used for sucking gas, realizing atomization of liquid and gas and increasing the specific surface area; the second unit is a Venturi tube, after the second unit is communicated with the first unit, a throat tube of the second unit is a multi-layer multi-tube Venturi tube and is communicated with external gas through a gas guide tube, the gas passes through the gas guide tube and a gas chamber and is sucked into the multi-hole multi-tube in each layer and the middle along a gas path, and gas and liquid move relatively in the gas guide tube and the gas chamber, so that full mixing and fine crushing are realized; and the third unit is communicated with the second unit and is a group of mixers, the gas and the liquid are further mixed in the third unit, the generation of the micro-nano bubbles is optimized, the mixing time is prolonged, and the bubble breaking capability of the generator is improved. The utility model belongs to the field of chemical reaction equipment, further dissolution of bubbles and multiple times of fine crushing of the bubbles are realized through the arranged micro-nano bubble generator, the volume of the generated bubbles is smaller, and the micro-nano bubble generation efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of chemical reaction equipment, and particularly relates to a micro-nano bubble generator. Background Art

[0002] Micro-nano bubbles generally refer to bubbles with a diameter of less than 50 μm. The rising speed of micro-nano bubbles in distilled water is proportional to the square of the diameter, which basically satisfies the Stokes formula; the surface tension on the gas-liquid interface squeezes the bubbles, causing the pressure inside the bubbles to increase, and the internal and external pressure difference is inversely proportional to the first power of the diameter, that is, the smaller the micro-nano bubbles, the higher the internal pressure. Surface charge is an important feature of micro-nano bubbles. Micro-nano bubbles are negatively charged in a wide pH range, and the equipotential pH value is about 3.5. The generation of hydroxyl radicals (·OH) by the explosion of micro-nano bubbles is a physicochemical feature worthy of attention. The huge specific surface area of ​​micro-nano bubbles and the increasing internal pressure as the diameter decreases make the gas in the bubbles dissolve more quickly in water, causing the bubbles to shrink themselves and eventually disappear or burst in water. This process will produce hydroxyl radicals (·OH) with extremely strong oxidizing ability. The local high temperature and high pressure generated when micro-bubbles explode and the high concentration of charge enrichment on the gas-liquid interface are considered to be important factors in promoting the generation of hydroxyl radicals (·OH). It has unique properties that are different from ordinary large bubbles, such as large specific surface area, slow rising speed, and high internal pressure. It has attracted widespread attention in recent years and has begun to be used in chemical industry, environmental governance, biology, medicine and other fields.

[0003] At present, there are several main methods for generating micro-nano bubbles: one is to generate micro-nano bubbles from micropores. Long-term operation is prone to blockage, which increases the maintenance workload. The second is to generate micro-nano bubbles by pressurized dissolved gas method, which is the most common generation method. It uses the characteristic that the solubility of gas increases with the increase of pressure. By pressurizing (400kPa), a large amount of gas is dissolved in the liquid phase, and then the pressure is restored to atmospheric pressure. The excess gas is precipitated in the liquid phase in the form of micro-nano bubbles. The infrastructure investment and energy consumption of the pressurized dissolved gas method are relatively high. The third is to use microchannels to generate micro-nano bubbles. By utilizing the size effect of microchannels, monodisperse micro-nano bubbles can be effectively generated. At the same time, the equivalent diameter of the microchannel has an absolute control effect on the size of micro-nano bubbles. Reducing the equivalent diameter of the microchannel can reduce the diameter of the micro-nano bubbles. The manufacturing cost of the microchannel microbubble generator will be significantly increased, and it is not convenient to prepare a large number of liquid micro-nano bubble solutions. The fourth is to use Venturi jet to generate micro-nano bubbles. The pressurized liquid is used as the working medium, and a high-speed jet is formed after being ejected from the nozzle, which generates negative pressure in the throat, sucks the gas in the air chamber into the throat, and the jet surface and the surrounding gas produce friction, the fluid particles and the gas particles are exchanged, the gas is drawn into the jet, and is carried away by the jet at high speed, while the negative pressure is caused in the suction chamber to form a local vacuum, and more surrounding gas is drawn into the jet, and the jet brings the gas from the suction chamber into the throat. In the throat and the diffuser, the gas is crushed into micro-nano small bubbles by the droplets, the droplets are re-polymerized into liquid, and the bubbles are dispersed in the liquid to become micro-nano bubbles. The fifth is the generation of micro-nano bubbles in the static mixer. Static mixing elements are set in the pipeline or at the outlet of the pipeline to effectively crush the gas into smaller bubbles, with high efficiency, and no blockage or operation failure. However, through the comparison of the effective mixing space of the fluid, under the same fluid velocity and energy input conditions, the fluid turbulence and energy dissipation that can be achieved by the static mixing bubbling method of the fluid will not be as good as the level that can be achieved by the jet bubbling method. The sixth is the generation of micro-nano bubbles in the porous plate venturi tube. Pressurized liquid is used as the working medium, which is ejected from the nozzle to form a high-speed jet, and then passes through the porous plate set at the entrance of the venturi throat, where the high-speed jet is cut and refined, and negative pressure is generated in the throat, and the gas in the air chamber is sucked into the throat. Friction occurs between the jet surface and the surrounding gas, and the fluid particles and gas particles are exchanged. The gas is drawn into the jet and carried away by the jet at high speed. At the same time, negative pressure is created in the suction chamber to form a local vacuum, and more surrounding gas is drawn into the jet. The jet brings the gas from the suction chamber into the throat. In the throat and diffuser, the gas is crushed into micro-nano small bubbles by droplets, and the droplets are re-polymerized into liquid, and the bubbles are dispersed in the liquid to become micro-nano bubbles. The disadvantage of this method is that the porous plate only plays the role of cutting gas and liquid during the period of time, and the effect is poor. Seventh, micro-nano bubbles occur in the porous venturi.That is, the throat of the venturi tube is set as several small venturi tubes. When the pressurized liquid flows through the porous tube at a high speed, the pressure in the tube is lower than the atmospheric pressure. The gas spontaneously enters and mixes with the water. Under the high-speed shearing action of the porous throat, it is strongly mixed to produce bubbles. When the pressure is released, a large number of micro-nano bubbles are precipitated. The disadvantage of this method is that the gas is sucked in the front part of the venturi throat, and the porous venturi tube sucks in a small amount of gas and the amount is uneven. In summary, the jet generates micro-nano bubbles, has a simple structure, and is easy to generate micro-nano bubbles. The energy consumption of generating micro-nano bubbles using hydraulic conditions is low, which is conducive to industrial production. It is particularly important to optimize the structure and parameters of the jet-generated micro-nano bubble generator, develop a simple and effective jet-generated micro-nano bubble generator, and refine the size of the micro-nano bubbles. Summary of the invention

[0004] In view of this, the utility model aims to propose a micro-nano bubble generator, so as to provide a micro-nano bubble generator with a simple structure and a small bubble diameter.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A micro-nano bubble generator comprises a first unit, a second unit and a third unit which are connected front and back and arranged along an axis; the first unit comprises one or a group of premixing nozzles, a water inlet and a first air guide pipe; the second unit is a large venturi tube, comprising a large venturi tube contraction section, a large venturi tube throat, a large venturi tube diffusion section, a second air guide pipe, an air chamber and an air path, wherein the large venturi tube throat comprises a multi-layer and multi-tube venturi tube; the third unit comprises a group of static mixers and a micro-nano bubble outlet or a group of static mixers and a conical mixer and a micro-nano bubble outlet.

[0007] Furthermore, the first unit premixing nozzle is a nozzle with a Venturi structure;

[0008] The large venturi tube throat is a multi-layer multi-tube venturi tube, including a small central venturi tube and small outer venturi tubes, the small central venturi tube and the small outer venturi tubes form at least two layers, the total number is more than three, at least one small central venturi tube is in the middle, the small outer venturi tubes are symmetrically arranged, and are connected to external gas through the first air guide tube and the second air guide tube, and the gas is sucked into the small central venturi tube and the small outer venturi tube along the air path through the first air guide tube and the second air guide tube and the air chamber;

[0009] The static mixer is of SK type, SX type, SV type, SL type or SH type.

[0010] Further, the ratio of the diameter of the large venturi tube contraction section to the diameter of the large venturi tube throat and the diameter of the large venturi tube diffusion section is 1.5-2.5:1:1.2-1.8;

[0011] The diameter of the large venturi tube contraction section ≥ the diameter of the large venturi tube diffusion section > the diameter of the large venturi tube throat;

[0012] The angle α of the large venturi tube contraction section is 30° to 60°, and the angle β of the large venturi tube diffusion section is 6° to 12°.

[0013] Further, the ratio of the diameter of the contraction section of the Venturi tube with a small center to the diameter of the throat of the Venturi tube with a small center and the diameter of the diffuser of the Venturi tube with a small center is 1.4-2.0:1:1.2-1.6;

[0014] The ratio of the diameter of the contraction section of the small outer venturi tube to the diameter of the throat of the small outer venturi tube and the diameter of the diffuser of the small outer venturi tube is 1.4-2.0:1:1.2-1.6;

[0015] The diameter of the contraction section of the Venturi tube with a small center is ≥ the diameter of the diffuser of the Venturi tube with a small center> the diameter of the throat of the Venturi tube with a small center;

[0016] The diameter of the contraction section of the outer small Venturi tube ≥ the diameter of the diffuser of the outer small Venturi tube > the diameter of the throat of the outer small Venturi tube;

[0017] The angle α' of the small and medium venturi tube contraction sections is 20° to 40°, and the angle β' of the central small venturi tube diffuser is 6° to 12°.

[0018] The angle α' of the outer small Venturi tube contraction section is 20° to 40°, and the angle β' of the outer small Venturi tube diffuser is 6° to 12°.

[0019] Furthermore, the second air guide tube is connected to the external gas, and the gas is sucked into the central small Venturi tube and the outer small Venturi tube along the air path through the second air guide tube and the air chamber, and the air path is a plurality of gaps less than 0.1 mm;

[0020] The gas path includes a small central Venturi tube gas path and a small outer Venturi tube gas path.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] The micro-nano bubble generator described in the utility model, through the air guide tube, air chamber and air path, utilizes the negative pressure of the venturi tube to suck the external gas into the throat of the multi-layer multi-tube venturi tube of the generator, and utilizes the multi-layer multi-tube venturi tube arranged in the throat of the large venturi tube to realize that the jet surface and the surrounding gas produce friction, the fluid particles and the gas particles are transposed, the gas is drawn into the jet, and is carried away by the jet at a high speed, and at the same time, a negative pressure is caused in the suction chamber to form a local vacuum, and more surrounding gas is drawn into the jet, and the jet brings the gas from the air chamber into the throat. In the throat and the diffusion tube, the gas is crushed into micro-nano small bubbles by the droplets, and the droplets are repolymerized into liquid, and the bubbles are dispersed in the liquid to become micro-nano bubbles. At the same time, the mixer connected later crushes the bubbles in the water flow again to form micro-nano bubbles, further improving the bubble breaking ability of the micro-nano bubble generator, that is, the ability to produce micro-nano bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the micro-nano bubble generator described in an embodiment of the utility model;

[0025] Figure 2 For the embodiment of the utility model Figure 1 Schematic diagram of the cross section along AA;

[0026] Figure 3 It is a schematic diagram of the gas path structure of the large throat and multi-layer multi-tube venturi throat of the micro-nano bubble generator described in the embodiment of the utility model;

[0027] Figure 4 For the embodiment of the utility model Figure 3 Schematic diagram of the section along BB and the section along CC;

[0028] Figure 5 For the embodiment of the utility model Figure 3 Schematic diagram of the section along DD and the section along EE;

[0029] Figure 6 It is a schematic diagram of a multi-layer multi-tube Venturi structure in a large Venturi throat according to an embodiment of the utility model;

[0030] Description of reference numerals:

[0031] 1. First unit; 101. Premixing nozzle; 102. Water inlet; 103. First air duct; 2. Second unit; 201. Large venturi tube contraction section; 202. Large venturi tube throat; 2021. Small central venturi tube; 2022. Small outer venturi tube; 203. Large venturi tube diffusion section; 204. Second air duct; 205. Air chamber; 206. Air path; 2061. Small central venturi tube air path; 2062. Small outer venturi tube air path; 3. Third unit; 301. Static mixer; 302. Cone; 303. Micro-nano bubble outlet. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] The present embodiment relates to a micro-nano bubble generator, which can further dissolve bubbles and break them up multiple times, and the volume of the generated bubbles is smaller, thereby improving the efficiency of micro-nano bubble generation.

[0036] Based on the above design concept, an exemplary structure of the micro-nano bubble generator of this embodiment is as follows: Figure 1-6 As shown, it mainly includes a first unit 1, a second unit 2 and a third unit 3 which are connected front and back and arranged along the axis; the first unit 1 includes one or a group of premixing nozzles 101, a water inlet 102 and a first air guide pipe 103; the second unit 2 includes a large venturi tube, a large venturi tube contraction section 201, a large venturi tube throat 202, a large venturi tube diffusion section 203, a second air guide pipe 204, an air chamber 205 and an air path 206, and the large venturi tube throat 202 includes a multi-layer and multi-tube venturi tube; the third unit 3 includes a group of static mixers 301 and a micro-nano bubble outlet 303 or a group of static mixers 301 and a conical body 302 mixer and a micro-nano bubble outlet 303.

[0037] The premixing nozzle 101 of the first unit 1 is a nozzle of a Venturi structure; the multi-layer and multi-tube Venturi tubes include a small central Venturi tube 2021 and a small outer Venturi tube 2022, the small central Venturi tube 2021 and the small outer Venturi tube 2022 form at least two layers, the total number is more than three, at least one small central Venturi tube 2021 is in the middle, the small outer Venturi tubes 2022 are symmetrically arranged, and are connected to the external gas by the first air duct 103 and the second air duct 204, the gas is sucked into the small central Venturi tube 2021 and the small outer Venturi tube 2022 along the air path 206 through the first air duct 103 and the second air duct 204, the air chamber 205; the static mixer 301 is SK type or SX type or SV type or SL type or SH type. When the conical mixer 302 is selected alone, the conical mixer 302 is connected to the end of the diffusion tube of the second part through a support rod. Of course, it can also be combined with the above-mentioned static mixer 301. When combined, the conical mixer 302 is placed at the very end.

[0038] The ratio of the diameter of the large venturi tube contraction section 201 to the diameter of the large venturi tube throat 202 and the diameter of the large venturi tube diffusion section 203 is 1.5-2.5:1:1.2-1.8; the diameter of the large venturi tube contraction section 201 ≥ the diameter of the large venturi tube diffusion section 203> the diameter of the large venturi tube throat 202; the angle α of the large venturi tube contraction section 201 is 30° to 60°, and the angle β of the large venturi tube diffusion section 203 is 6° to 12°.

[0039] The ratio of the diameter of the contraction section of the small center venturi tube to the diameter of the throat of the small center venturi tube and the diameter of the diffuser of the small center venturi tube is 1.4-2.0:1:1.2-1.6;

[0040] The ratio of the diameter of the contraction section of the small outer venturi tube to the diameter of the throat of the small outer venturi tube and the diameter of the diffuser of the small outer venturi tube is 1.4-2.0:1:1.2-1.6;

[0041] The diameter of the contraction section of the Venturi tube with a small center is ≥ the diameter of the diffuser of the Venturi tube with a small center> the diameter of the throat of the Venturi tube with a small center;

[0042] The diameter of the contraction section of the outer small Venturi tube ≥ the diameter of the diffuser of the outer small Venturi tube > the diameter of the throat of the outer small Venturi tube;

[0043] The angle α' of the small and medium venturi tube contraction section is 20° to 40°, and the angle β' of the central small venturi tube diffuser is 6° to 12°.

[0044] The angle α' of the outer small Venturi tube contraction section is 20° to 40°, and the angle β' of the outer small Venturi tube diffuser is 6° to 12°.

[0045] The second air duct 204 is connected to the external gas. The gas is sucked into the small central Venturi tube 2021 and the small outer Venturi tube 2022 along the air path 206 through the second air duct 204 and the air chamber 205. The air path 206 is a plurality of gaps smaller than 0.1 mm. Specifically, the air path 206 includes a small central Venturi tube air path 2061 and a small outer Venturi tube air path 2062.

[0046] When the micro-nano bubble generator described in this embodiment is in use, the negative pressure of the large venturi throat 202 is used to suck the external gas into the throat of the multi-layer multi-tube venturi of the generator through the first air duct 103 and the second air duct 204, the air chamber 205 and the air path 206, and the multi-layer multi-tube venturi set in the large venturi throat 202 is used to realize the friction between the jet surface and the surrounding gas, the fluid particles and the gas particles are exchanged, the gas is drawn into the jet and carried away by the jet at high speed, and at the same time, a negative pressure is caused in the suction chamber 205 to form a local vacuum, and more surrounding gas is drawn into the jet, and the jet brings the gas from the air chamber 205 into the throat. In the throat and the diffusion tube, the gas is crushed into micro-nano small bubbles by the droplets, the droplets are re-polymerized into liquid, and the bubbles are dispersed in the liquid to become micro-nano bubbles. At the same time, the subsequent static mixer 301 or conical mixer 302 or static mixer 301 and conical mixer 302 crush the bubbles in the water flow again to form micro-nano bubbles, further improving the bubble crushing ability of the micro-nano bubble generator, that is, the ability to generate micro-nano bubbles.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-nano bubble generator, characterized in that: A first unit (1), a second unit (2) and a third unit (3) are arranged along an axis and are connected to each other in the front and back directions; the first unit (1) comprises one or a group of premixing nozzles (101), a water inlet (102) and a first air guide pipe (103); the second unit (2) is a large venturi tube, comprising a large venturi tube contraction section (201), a large venturi tube throat (202), a large venturi tube diffusion section (203), a second air guide pipe (204), an air chamber (205) and an air path (206); the large venturi tube throat (202) comprises a multi-layer multi-tube venturi tube; the third unit (3) comprises a group of static mixers (301) and a micro-nano bubble outlet (303) or a group of static mixers (301) and a conical mixer (302) and a micro-nano bubble outlet (303).

2. The micro-nano bubble generator according to claim 1, characterized in that: The premixing nozzle (101) of the first unit (1) is a nozzle with a Venturi structure; The large venturi tube throat (202) is a multi-layer, multi-tube venturi tube, comprising a small central venturi tube (2021) and small outer venturi tubes (2022); the small central venturi tube (2021) and the small outer venturi tubes (2022) form at least two layers, with a total number of more than three layers, at least one small central venturi tube (2021) being in the middle; the small outer venturi tubes (2022) are symmetrically arranged and are connected to external gas via a first air guide tube (103) and a second air guide tube (204); the gas is sucked into the small central venturi tube (2021) and the small outer venturi tube (2022) along an air path (206) via the first air guide tube (103) and the second air guide tube (204), and an air chamber (205); The static mixer (301) is of SK type, SX type, SV type, SL type or SH type.

3. The micro-nano bubble generator according to claim 2, characterized in that: The ratio of the diameter of the large venturi tube contraction section (201) to the diameter of the large venturi tube throat (202) and the diameter of the large venturi tube diffusion section (203) is 1.5-2.5:1:1.2-1.8; The diameter of the large venturi tube contraction section (201) ≥ the diameter of the large venturi tube diffusion section (203) > the diameter of the large venturi tube throat (202); The angle α of the large venturi tube contraction section (201) is 30° to 60°, and the angle β of the large venturi tube diffusion section (203) is 6° to 12°.

4. The micro-nano bubble generator according to claim 2, characterized in that: The ratio of the diameter of the contraction section of the Venturi tube (21) with a small center to the diameter of the throat of the Venturi tube (21) with a small center and the diameter of the diffusion tube of the Venturi tube (21) with a small center is 1.4-2.0:1:1.2-1.6; The ratio of the diameter of the contraction section of the small outer venturi tube (222), the diameter of the throat of the small outer venturi tube (222), and the diameter of the diffusion tube of the small outer venturi tube (222) is 1.4-2.0:1:1.2-1.6; The diameter of the contraction section of the Venturi tube (2021) with a small center is ≥ the diameter of the diffusion tube of the Venturi tube (2021) with a small center> the diameter of the throat of the Venturi tube (2021) with a small center; The diameter of the contraction section of the small outer venturi tube (2022) is ≥ the diameter of the diffusion tube of the small outer venturi tube (2022)> the diameter of the throat of the small outer venturi tube (2022); The angle α' of the contraction section of the small and medium venturi tubes (2021) is 20° to 40°, and the angle β' of the diffuser of the central small venturi tube (2021) is 6° to 12°; The angle α' of the contraction section of the outer small Venturi tube (2022) is 20° to 40°, and the angle β' of the diffusion tube of the outer small Venturi tube (2022) is 6° to 12°.

5. The micro-nano bubble generator according to claim 2, characterized in that: The second air guide tube (204) is in communication with external gas, and the gas is sucked into the central small Venturi tube (221) and the outer small Venturi tube (222) along the air path (206) through the second air guide tube (204) and the air chamber (205), wherein the air path (206) is a plurality of gaps smaller than 0.1 mm; The gas circuit (206) comprises a small central Venturi tube gas circuit (2061) and a small outer Venturi tube gas circuit (2062).

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