A cyclone venturi type micro-bubble generator

Abstract

The application belongs to the technical field of micro-bubble generating equipment, and proposes a cyclone type Venturi micro-bubble generator. The liquid inlet pipe is tangent to the outer edge of the liquid distribution cavity; the liquid distribution cavity is a circular ring body; the cyclone cylinder is composed of multiple rotation starting modules, and the space between adjacent rotation starting modules is a rotation starting channel; the cross section of the cyclone cavity is an annular channel with equal cross-sectional area; the flow guide cone includes a cylindrical section and a conical section; the length of the cyclone cavity is the same as the length of the cylindrical section of the flow guide cone in the axial direction; the air guide pipe is arranged outside the micro-bubble generator along the axis of the flow guide cone and distributes gas through the communication with the flow guide cone; the Venturi nozzle is connected with the cyclone cavity and located on the opposite side of the air guide pipe. The application can achieve a higher diameter reduction ratio, increase the degree of reduction of the liquid cyclone diameter, double the liquid rotation speed and cyclone intensity, and thus enhance the ability of the cyclone to shear and break the gas-liquid interface to form micro-bubbles; and the current structure can form a gas-liquid two-phase shock wave, which can ensure the generation of smaller size micro-bubbles.

Description

Technical Field

[0001] This invention relates to the field of microbubble generating equipment technology, and in particular to a swirling venturi-type microbubble generator. Background Technology

[0002] Microbubbles are bubbles in liquid with a diameter between 1 and 100 μm. They have the characteristics of large specific surface area, long residence time in liquid phase, good surface adsorption performance, fast mass transfer rate and easy generation of strong oxidant hydroxyl radicals. They are widely used in medical diagnosis and treatment, sewage treatment, industrial cleaning and mineral flotation, etc., and exhibit many excellent properties.

[0003] Currently, microbubble generation technology can be categorized into five types based on its generation principle: dissolved gas release, induced dispersion, microporous dispersion, multiphase pumping, and swirl shearing. Dissolved gas release microbubble generators dissolve gas in water under pressure until it reaches a supersaturated state, then use a dissolved gas release device to depressurize the water and release the gas as bubbles. This type of microbubble generator has the advantages of generating a large number of bubbles and uniform bubble size distribution, but it requires a pressure dissolved gas tank and a dissolved gas release device, resulting in a complex microbubble generation system and a large footprint. Induced dispersion microbubble generators use impeller swirl shearing or Venturi jet methods to draw in air under negative pressure, then disperse the airflow into microbubbles under the shearing action of the impeller or high-speed jet. This type of microbubble generator features a large air intake capacity, but it consumes a lot of energy to generate microbubbles and produces relatively large bubbles. Microbubble generators with micropore dispersion disperse pressurized gas into fine gas streams through micropores, which then form microbubbles under the shearing action of the liquid flow. These generators are characterized by their simple structure and compact design, but the small size of the micropores makes them prone to clogging, leading to high maintenance costs. Multiphase pumped microbubble generators operate on the same principle as dissolved-gas release generators, both involving pressurizing and dissolving the gas, and depressurizing and releasing the gas to generate bubbles. However, multiphase pumped microbubble generators utilize gas-liquid mixing and pumping technology to integrate both processes, resulting in greater compactness compared to dissolved-gas release generators. However, they consume more energy, and the high-speed impeller causes significant wear and tear. In reality, the advantages and disadvantages of the above four types of microbubble generators are particularly pronounced. The swirling shear microbubble generator utilizes the combined effects of liquid swirling shearing and turbulent pulsation to disperse gas into microbubbles. It possesses advantages such as self-priming, simple and compact structure, and resistance to clogging of the flow channels, making it a promising microbubble generation technology. Therefore, it is necessary to further develop the bubble formation theory of the swirling shear microbubble generator and propose corresponding structures. Summary of the Invention

[0004] The purpose of this invention is to provide a swirling venturi-type microbubble generator, which has the characteristics of no moving parts, simple structure, self-priming air intake, and high reliability, and can efficiently generate microbubbles.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A swirling Venturi microbubble generator includes an inlet pipe 1, a distribution chamber 2, a swirling cylinder 3, a guide cone 4, a swirling cavity 5, an air intake pipe 6, and a Venturi nozzle 7; the distribution chamber 2, the swirling cylinder 3, the guide cone 4, the swirling cavity 5, the air intake pipe 6, and the Venturi nozzle 7 are arranged coaxially; the inlet pipe 1 is tangential to the outer edge of the distribution chamber 2, and the liquid phase enters the distribution chamber 2 tangentially along the circumference of the distribution chamber 2 through the inlet pipe 1; the distribution chamber 2 is an annular body in which the liquid phase is uniformly distributed; the swirling cylinder 3 is composed of multiple swirl-initiating modules 301, and adjacent swirl-initiating modules 301 are arranged in a circular pattern. The space between 01 is the swirl initiation channel 302, through which liquid enters the swirling cavity 5 tangentially from the liquid distribution chamber 2 via the swirl initiation channel 302; the swirling cavity 5 has a cross-section of an annular channel with equal cross-sectional area; the guide cone 4 includes a cylindrical section and a conical section; the length of the swirling cavity 5 is the same as the axial length of the cylindrical section of the guide cone 4; the air intake pipe 6 is arranged outside the microbubble generator along the axis of the guide cone 5, and distributes gas through communication with the guide cone 4; the Venturi nozzle 7 is connected to the swirling cavity 5 and is located on the opposite side of the air intake pipe 6, and includes a contraction section 701, a throat section 702, and an expansion section 703 in sequence.

[0006] One end of the air intake tube 6 is connected to the apex of the conical section of the guide cone 4.

[0007] One end of the air intake pipe 6 is connected to the cylindrical section of the guide cone 4; the cylindrical section is provided with a buffer air chamber 9 and several air vents 8 are arranged; the buffer air chamber 9 is a cylindrical cavity, and the air vents 8 are evenly distributed around the buffer air chamber 9 and arranged in an axially staggered manner; the air vents 8 are columnar gas flow channels, and the central axis of the air vents 8 is perpendicular to the central axis of the microbubble generator, and the swirling cavity 5 and the buffer air chamber 9 are connected through the air vents 8.

[0008] The number of inlet pipes is 1 to 4, and they are evenly arranged around the liquid distribution chamber.

[0009] The swirl initiation modules 301 of the swirl tube 3 are evenly distributed circumferentially, and the number of swirl initiation channels 302 formed by adjacent swirl initiation modules 301 is 2 to 12; the upper and lower planes of the swirl initiation channels 302 are parallel, and the liquid enters the swirl chamber 5 tangentially through the swirl initiation channels 302; the distance between the upper and lower planes of the swirl initiation channels 302 is not greater than the circumferential width of the swirl chamber 5.

[0010] The ratio of the diameter of the cylindrical section of the guide cone 4 to the diameter of the swirl chamber 5 is (0.30~0.95):1, and the length of the cylindrical section of the guide cone 4 is not less than the length of the swirl tube 3.

[0011] The cone angle of the conical section of the guide cone 4 is 3° to 120°, and the apex of the conical section cannot cross the inlet of the venturi nozzle throat section 702.

[0012] The ratio of the diameter of the throat section 702 to the diameter of the swirling cavity 5 is (0.01~0.2):1, the opening angle of the converging section 701 of the Venturi nozzle is 20°~150°, and the opening angle of the expanding section 703 of the Venturi nozzle is 3°~20°.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] (1) Insert a guide cone into the contraction section of the swirling cavity and the venturi tube to form an annular flow channel. Under the same cross-sectional area, since the guide cone occupies the central position, the outer diameter of the flow channel is much larger than that of a circular channel without a guide cone. Therefore, the current structure can achieve a higher diameter reduction ratio, which increases the degree of reduction of the liquid swirling diameter, doubles the liquid rotation speed and swirling intensity, thereby enhancing the ability of swirling shear to destroy the gas-liquid interface and form microbubbles.

[0015] (2) By introducing a Venturi nozzle, this invention adds a gas-liquid two-phase shock wave to break up bubbles based on the swirling shear and turbulent pulsating bubble generation principle of conventional swirling microbubble generators. In this way, under the synergistic effect of multiple microbubble generation mechanisms, smaller microbubbles are generated. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a swirling Venturi-type microbubble generator (first embodiment, with air intake at the apex of the guide cone section);

[0017] Figure 2 yes Figure 1 AA section view in the middle;

[0018] Figure 3 This is a cross-sectional view of the second implementation structure of the vortex-type Venturi microbubble generator (the cylindrical section of the guide cone has ventilation holes);

[0019] Figure 4 yes Figure 3 BB section view in the middle.

[0020] In the diagram: 1-Inlet pipe, 2-Distribution chamber, 3-Swirl tube, 301-Swirl initiation module, 302-Swirl initiation channel, 4-Guide cone, 401-Cylindrical section, 402-Conical section, 5-Swirl chamber, 6-Air intake pipe, 7-Venturi nozzle, 701-Contraction section, 702-Throat section, 703-Expansion section, 8-Ventilation hole, 9-Buffer chamber. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the technical solutions of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-4 The present invention provides the following solutions:

[0023] A swirling Venturi microbubble generator includes an inlet pipe 1, a liquid distribution chamber 2, a swirling cylinder 3, a guide cone 4, a swirling cavity 5, an air intake pipe 6, and a Venturi nozzle 7. The liquid distribution chamber 2, swirling cylinder 3, guide cone 4, swirling cavity 5, air intake pipe 6, and Venturi nozzle 7 are coaxial. The inlet pipe 1 is tangential to the outer edge of the liquid distribution chamber 2, and the liquid phase enters the liquid distribution chamber 2 tangentially along its circumference through the inlet pipe 1. The liquid distribution chamber 2 is an annular body in which the liquid phase is uniformly distributed. The swirling cylinder 3 is composed of multiple swirl-initiating modules 301, with adjacent swirl-initiating modules 301 positioned close to each other. The space is the swirl initiation channel 302, through which liquid enters the swirling cavity 5 tangentially from the liquid distribution chamber 2 via the swirl initiation channel 302; the guide cone 4 includes two parts: a cylindrical section 401 and a conical section 402; the swirling cavity 5 and the cylindrical section 401 of the guide cone 4 have the same length in the axial direction and are annular channels with equal cross-sectional area; the air intake pipe 6 is arranged along the axis of the guide cone 4 from the outside of the microbubble generator; the Venturi nozzle 7 is connected to the swirling cavity 5 and is located on the opposite side of the air intake pipe 6, and includes three parts in sequence: a contraction section 701, a throat section 702, and an expansion section 703.

[0024] Furthermore, the liquid inlet pipe 1 is tangent to the outer edge of the liquid distribution chamber 2, and there are 1 to 4 of them, which are evenly arranged around the circumference of the liquid distribution chamber 2;

[0025] Furthermore, the swirl initiation modules 301 of the swirling cylinder 3 are evenly distributed circumferentially, and the number of swirl initiation channels 302 formed by adjacent swirl initiation modules 301 is 2 to 12. The upper and lower planes of the swirl initiation channels 302 are parallel, and the liquid enters the swirling cavity 5 tangentially through the swirl initiation channels 302. The distance between the upper and lower planes of the swirl initiation channels 302 is not greater than the circumferential width of the swirling cavity 5.

[0026] Furthermore, the ratio of the diameter of the cylindrical section 401 of the guide cone 4 to the diameter of the swirling cavity 5 is (0.30~0.95):1, and the length of the cylindrical section 401 of the guide cone 4 is not less than the length of the swirling tube 3;

[0027] Furthermore, the cone angle of the conical section 402 of the guide cone 4 is 3° to 120°, and the apex of the conical section 402 cannot cross the inlet of the throat section 702 of the Venturi nozzle 7;

[0028] Furthermore, the Venturi nozzle 7 sequentially includes a converging section 701, a throat section 702, and a dilating section 703. The ratio of the diameter of the throat section 702 to the diameter of the swirling chamber 5 is (0.01~0.2):1. The angle of the converging section 701 of the Venturi nozzle 7 is 20°~150°, and the angle of the dilating section 703 of the Venturi nozzle 7 is 3°~20°.

[0029] Furthermore, based on the first embodiment described above, the present invention proposes a second embodiment. In the second embodiment, the air inlet position is moved from the apex of the conical section 402 of the guide cone 4 to the cylindrical section 401 of the guide cone 4. The cylindrical section 401 is provided with a buffer chamber 9 and vent holes 8. The buffer chamber 9 is a cylindrical cavity. The vent holes 8 are evenly distributed circumferentially and staggered axially. The vent holes 8 are columnar gas flow channels. The central axis of the vent holes 8 is perpendicular to the central axis of the microbubble generator. The swirling cavity 5 and the buffer chamber 9 are connected through the vent holes 8.

[0030] Working principle: such as Figures 1-2 As shown, the liquid phase enters the distribution chamber 2 tangentially through the inlet pipe 1. The liquid in the distribution chamber 2 is guided by the swirl-initiating module 301 on the swirl cylinder 3 and enters the swirl chamber 5 tangentially through the swirl-initiating channel 302, forming a liquid swirl in the swirl chamber 5. The conical section 402 of the guide cone 4 occupies the liquid flow space. The swirl is accelerated and swirled after passing through the contraction section 701 of the venturi tube 7. Due to the swirling effect, a negative pressure is formed at the central axis, and the self-aspirated gas enters from the conical section of the guide cone through the air intake pipe 6. The gas enters the contraction section 701 of the Venturi nozzle 7 at the apex of the segment, and the gas entering the contraction section 701 is located at the center of the swirling flow. The swirling liquid reaches its maximum swirling intensity in the throat section 702 of the Venturi nozzle 7, and the gas forms microbubbles through swirling shear, turbulent pulsation and vortex breaking. Subsequently, in the expansion section 703 of the Venturi nozzle 7, a gas-liquid two-phase shock wave can be formed. Under the action of the shock wave, the microbubbles can be further broken into smaller bubbles.

[0031] like Figures 3-4 As shown, the working principle of the second embodiment is the same as that of the first embodiment. The only difference is that the air intake position is changed. Instead of the air intake at the apex of the conical section 402 of the guide cone 4 in the first embodiment, the air intake is changed to the air intake through the vent 8 set in the cylindrical section 401 of the guide cone 4. The advantage of the second embodiment is that the gas is immediately broken by the shearing action of the swirling liquid after entering the swirling cavity 5, which can enhance the fineness of the bubbles.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A swirling venturi-type microbubble generator, characterized in that, The swirling Venturi microbubble generator includes an inlet pipe (1), a distribution chamber (2), a swirling cylinder (3), a guide cone (4), a swirling chamber (5), an air intake pipe (6), and a Venturi nozzle (7); the distribution chamber (2), the swirling cylinder (3), the guide cone (4), the swirling chamber (5), the air intake pipe (6), and the Venturi nozzle (7) are arranged coaxially; the inlet pipe (1) is tangential to the outer edge of the distribution chamber (2), and the liquid phase enters the distribution chamber (2) tangentially along the circumference of the distribution chamber (2) through the inlet pipe (1); the distribution chamber (2) is an annular ring. The liquid phase is uniformly distributed within the liquid; the swirling cylinder (3) is composed of multiple swirl-initiating modules (301), and the space between adjacent swirl-initiating modules (301) is a swirl-initiating channel (302). The liquid enters the swirling cavity (5) tangentially from the liquid distribution chamber (2) through the swirl-initiating channel (302); the swirling cavity (5) has a cross-section of an annular channel with equal cross-sectional area; the guide cone (4) includes a cylindrical section and a conical section; the length of the swirling cavity (5) is the same as the axial length of the cylindrical section of the guide cone (4); the air intake pipe (6) The gas is distributed by the guide cone (4) outside the microbubble generator and along its axis. The Venturi nozzle (7) is connected to the swirling cavity (5) and is located on the opposite side of the air intake pipe (6). It includes a contraction section (701), a throat section (702), and an expansion section (703). The ratio of the diameter of the cylindrical section of the guide cone (4) to the diameter of the swirling cavity (5) is (0.30~0.95):

1. One end of the air intake pipe (6) is connected to the apex of the conical section of the guide cone (4) or the air intake pipe (6) is connected to the apex of the conical section of the guide cone (4). The end is connected to the cylindrical section of the guide cone (4); when one end of the air intake pipe (6) is connected to the cylindrical section of the guide cone (4), the cylindrical section is provided with a buffer gas chamber (9) and several ventilation holes (8); the buffer gas chamber (9) is a cylindrical cavity, and the ventilation holes (8) are evenly distributed around the buffer gas chamber (9) and arranged in an axially staggered manner; the ventilation holes (8) are columnar gas flow channels, and the central axis of the ventilation holes (8) is perpendicular to the central axis of the microbubble generator, and the swirling cavity (5) and the buffer gas chamber (9) are connected through the ventilation holes (8).

2. The swirling venturi-type microbubble generator according to claim 1, characterized in that, The number of inlet pipes (1) is 1 to 4, and they are evenly arranged around the liquid distribution chamber (2).

3. The swirling venturi-type microbubble generator according to claim 2, characterized in that, The swirl initiation modules (301) of the swirling cylinder (3) are evenly distributed along the circumference, and the number of swirl initiation channels (302) formed by adjacent swirl initiation modules (301) is 2 to 12; the upper and lower planes of the swirl initiation channels (302) are parallel, and the liquid enters the swirling cavity (5) tangentially through the swirl initiation channels (302); the distance between the upper and lower planes of the swirl initiation channels (302) is not greater than the circumferential width of the swirling cavity (5).

4. The swirling venturi-type microbubble generator according to claim 1, characterized in that, The length of the cylindrical section of the guide cone (4) is not less than the length of the vortex tube (3).

5. The swirling venturi-type microbubble generator according to claim 4, characterized in that, The cone angle of the conical section of the guide cone (4) is 3° to 120°, and the apex of the conical section cannot cross the inlet of the venturi nozzle throat section (702).

6. The swirling venturi-type microbubble generator according to any one of claims 1-5, characterized in that, The ratio of the diameter of the throat section (702) to the diameter of the swirling cavity (5) is (0.01~0.2):1, and the angle of the contraction section (701) of the Venturi nozzle is 20°. o ~150 o The divergence angle of the venturi nozzle's diffuser section (703) is 3. o ~20 o .

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