A cyclone-reversing microbubble generator

Abstract

The application belongs to the technical field of micro-bubble generating equipment, and discloses a cyclone-reversal type micro-bubble generator. The micro-bubble generator comprises a liquid inlet pipe, a cyclone isolation cylinder, a first-stage cyclone cavity, a second-stage cyclone cavity, a cyclone reversal cavity, a Venturi nozzle and an air injection pipe. Liquid phase enters the first-stage cyclone cavity along the tangential direction of the periphery of the first-stage cyclone cavity through the liquid inlet pipe. The cyclone isolation cylinder is coaxial and isohypse with the first-stage cyclone cavity, and the inside of the cyclone isolation cylinder is the second-stage cyclone cavity. One end of the first-stage cyclone cavity and one end of the second-stage cyclone cavity are connected with the cyclone reversal cavity. The air injection pipe is inserted into the second-stage cyclone cavity through the cyclone reversal cavity along the central axis of the micro-bubble generator. The other end of the second-stage cyclone cavity is connected with the Venturi nozzle. The contraction pipe section is directly connected with the other end of the second-stage cyclone cavity or extends into the second-stage cyclone cavity. The micro-bubble generator has the advantages of ensuring the stability of cyclone, being more compact in structure, having stronger cyclone shear action on airflow, and generating smaller micro-bubbles.

Description

Technical Field

[0001] This invention relates to the field of microbubble generating equipment technology, and specifically to a swirling-reverse microbubble generator. Background Technology

[0002] Microbubbles possess advantages such as large specific surface area, good surface adsorption performance, and long residence time in the liquid phase. Furthermore, they generate a large number of highly oxidizing free radicals upon collapse, and are currently widely used in various fields including petrochemicals, aeration and oxygenation, wastewater treatment, and mineral flotation. In addition, the dispersion of ozone gas into microbubbles enables efficient ozone dissolution and the generation of large amounts of hydroxyl radicals. Therefore, in recent years, microbubble generation technology has also been used in the preparation of ozone water, enabling green cleaning of semiconductors.

[0003] Due to the unique physicochemical properties and wide range of applications of microbubbles, various microbubble generators based on different principles have been proposed, such as dissolved gas release microbubble generators, micropore dispersion microbubble generators, and induced dispersion microbubble generators. Dissolved gas release microbubble generators have the advantages of generating a large number of bubbles and uniform bubble size distribution, but they require a pressure dissolved gas tank and a dissolved gas release device, making the microbubble generation system complex. Micropore dispersion microbubble generators, while simple in structure and compact in design, are prone to clogging due to the small size of the micropores, resulting in high maintenance costs, and the generated bubbles contain a large number of millimeter-sized bubbles. Induced dispersion microbubble generators use impeller swirl or Venturi jet methods to draw in air under negative pressure, and then the airflow is dispersed into microbubbles under the shearing action of the impeller or the turbulent shearing action of the high-speed jet. They have the advantage of large air intake, but the generation of microbubbles is energy-intensive and the bubble size is relatively large.

[0004] This invention addresses the main problems currently existing in induced dispersion bubble generators by designing a reasonable structure that combines swirling shear and venturi jet through a single device, achieving efficient microbubble generation while ensuring a more compact device structure. Summary of the Invention

[0005] The purpose of this invention is to provide a swirling-reverse microbubble generator, which features no moving parts, compact structure, self-priming air intake, high reliability, and efficient microbubble generation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a swirling-reversing microbubble generator, comprising an inlet pipe 1, a swirling isolation cylinder 2, a primary swirling chamber 3, a secondary swirling chamber 4, a swirling reversing chamber 5, a Venturi nozzle 6, and an air intake pipe 7; the six parts—the swirling isolation cylinder 2, the primary swirling chamber 3, the secondary swirling chamber 4, the swirling reversing chamber 5, the Venturi nozzle 6, and the air intake pipe 7—are coaxial; the inlet pipe 1 is tangential to the outer edge of the primary swirling chamber 3, and the liquid phase enters the primary swirling chamber 3 tangentially along its circumference through the inlet pipe 1; the primary swirling chamber 3 is an annular cavity with a uniform cross-section or an annular cavity formed by two frustums; a coaxial swirling isolation cylinder 2 of equal height is disposed inside the primary swirling chamber 3, and the interior of the swirling isolation cylinder 2... The secondary swirling chamber 4 is a two-stage swirling chamber; one end of the primary swirling chamber 3 and one end of the secondary swirling chamber 4 are connected to the swirling reversal chamber 5; the swirling reversal chamber 5 is the fluid flow area where the rotating liquid flow transitions from the primary swirling chamber 3 to the secondary swirling chamber 4, and it includes a cylindrical section and a conical section; the air intake pipe 7 extends from the outside along the central axis of the microbubble generator through the swirling reversal chamber 5 into the secondary swirling chamber 4; the other end of the secondary swirling chamber 4 is connected to the Venturi nozzle 6; the Venturi nozzle 6 includes three parts in sequence: a contraction section 601, a throat section 602, and an expansion section 603; the contraction section 601 is directly connected to the other end of the secondary swirling chamber 4 or extends into the secondary swirling chamber 4, and the contraction section 601 of the secondary swirling chamber 4 and the Venturi nozzle 6 coincide.

[0007] The number of inlet pipes 1 is 1 to 4, and they are evenly arranged around the circumference of the primary vortex chamber 3. The diameter of the inlet pipe 1 is not greater than the width of the annular cross section of the primary vortex chamber 3.

[0008] The height of the cylindrical section of the swirling reversal cavity 5 is greater than or equal to 0.

[0009] The cone angle of the conical section of the swirling reversal cavity 5 is 3° to 120°.

[0010] The ratio of the diameter of the throat section 602 to the diameter of the cylindrical section of the swirling reversal cavity 5 is (0.01~0.2):1, the opening angle of the contraction section 601 is 20°~150°, and the opening angle of the expansion section 603 is 3°~20°.

[0011] The apex angles of the two frustums are 5° to 80°.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) A two-stage swirling cavity structure is adopted. The first-stage swirling cavity is used for rectification, and the second-stage swirling cavity is used to increase the liquid rotation speed and enhance the liquid rotation intensity. The two are separated into two spatial regions by the swirling isolation cylinder. They are coaxial and wrapped inside and outside, which can ensure the stability of the swirling flow and make the microbubble generator structure more compact.

[0014] (2) By using the first-stage swirling chamber to make the liquid form a swirling flow outside the chamber, the initial angular momentum of the liquid can be greater. According to the theorem of angular momentum, the liquid flow has a greater increase in rotational angular velocity after entering the Venturi nozzle through the second-stage swirling chamber, and therefore has a stronger swirling shearing effect on the airflow.

[0015] (3) By introducing a Venturi nozzle, based on the swirling shear and turbulent pulsating microbubble generation principle of conventional swirling microbubble generator, a gas-liquid two-phase shock wave is added to further break down microbubbles. In this way, under the synergistic effect of multiple microbubble generation mechanisms, smaller microbubbles can be generated. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the first embodiment of the swirling-reversing microbubble generator of the present invention;

[0017] Figure 2 This is a cross-sectional view (AA) of the first embodiment of the swirling-reversing microbubble generator of the present invention;

[0018] Figure 3 This is a cross-sectional view of a second embodiment of the swirling-reversing microbubble generator of the present invention;

[0019] Figure 4 This is a cross-sectional view of a third embodiment of the swirling-reversing microbubble generator of the present invention.

[0020] In the diagram: 1-Inlet pipe, 2-Swirl isolation cylinder, 3-First-stage swirling chamber, 4-Second-stage swirling chamber, 5-Swirl reversal chamber, 501-Cylindrical section, 502-Conical section, 6-Venturi nozzle, 601-Contraction section, 602-Throat section, 603-Expansion section, 7-Air intake pipe. 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 invention.

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

[0023] like Figure 1As shown, a swirling-reversing microbubble generator includes an inlet pipe 1, a swirling isolation cylinder 2, a primary swirling chamber 3, a secondary swirling chamber 4, a swirling reversing chamber 5, a Venturi nozzle 6, and an air intake pipe 7. The six parts—the swirling isolation cylinder 2, the primary swirling chamber 3, the secondary swirling chamber 4, the swirling reversing chamber 5, the Venturi nozzle 6, and the air intake pipe 7—are coaxial. The inlet pipe 1 is tangential to the outer edge of the primary swirling chamber 3, and the liquid phase enters the primary swirling chamber 3 tangentially along its circumference through the inlet pipe 1. The swirling isolation cylinder 2 is cylindrical and is used to isolate the swirling liquid in the primary swirling chamber 3 and the secondary swirling chamber 4, preventing the interaction between the fluids in the two chambers. The primary swirling chamber 3 is located within the swirling isolation cylinder. Outside of 2 is an annular cavity coaxial with and of equal height to the swirl isolation cylinder 2; the secondary swirl cavity 4 is located inside the swirl isolation cylinder 2 and is a cylindrical cavity coaxial with and of equal height to the swirl isolation cylinder 2; the swirl reversal cavity 5 is the fluid flow area where the rotating liquid transitions from the primary swirl cavity 3 to the secondary swirl cavity 4, including a cylindrical section 501 and a conical section 502; the Venturi nozzle 6 is connected to one end of the secondary swirl cavity 4 and includes three parts in sequence: a contraction section 601, a throat section 602, and an expansion section 603; the air intake pipe 7 is located at the other end of the secondary swirl cavity 4 and is inserted into the secondary swirl cavity 4 from the outside along the central axis of the microbubble generator through the swirl reversal cavity 5.

[0024] Preferably, the liquid inlet pipe 1 is tangent to the outer edge of the primary vortex chamber 3, and there are 1 to 4 of them, which are evenly arranged around the circumference of the primary vortex chamber 3. The diameter of the liquid inlet pipe 1 is not greater than the width of the annular cross section of the primary vortex chamber 3.

[0025] Preferably, the height of the cylindrical segment 501 of the vortex reversal cavity 5 is greater than or equal to 0;

[0026] Preferably, the cone angle of the conical section 502 of the swirling reversal cavity 5 is 3° to 120°;

[0027] Preferably, the Venturi nozzle 6 comprises a converging section 601, a throat section 602, and a dilating section 603 in sequence. The ratio of the diameter of the throat section 602 to the diameter of the cylindrical section 501 of the swirling reversal chamber 5 is (0.01 to 0.2):1. The angle of the converging section 601 of the Venturi nozzle 6 is 20° to 150°, and the angle of the dilating section 603 of the Venturi nozzle 6 is 3° to 20°.

[0028] Preferably, the present invention proposes a second implementation structure based on the above-described basic structure, such as... Figure 3 As shown, the second implementation structure is to extend the converging section 601 of the Venturi nozzle 6 in the reverse direction into the secondary swirling chamber 4, so that the secondary swirling chamber 4 and the converging section 601 of the Venturi nozzle 6 coincide.

[0029] Preferably, the present invention proposes a third embodiment based on the second embodiment, such as... Figure 4 As shown, the third implementation structure is to adjust the primary swirl cavity 3 from an annular cavity to a cavity space enclosed by two frustums. The cross-section of this cavity space is still annular, and the apex angle of the two frustums is 5° to 80°.

[0030] Working principle: such as Figures 1-2 As shown, in the first embodiment, the liquid phase enters the first-stage swirling chamber 3 tangentially through the inlet pipe 1, forming a liquid swirling flow in the first-stage swirling chamber 3. The swirling flow enters the swirling reversal chamber 5 along the swirling isolation cylinder 2, where the direction of the liquid swirling flow is reversed. Then, the swirling flow enters the second-stage swirling chamber 4. Due to the high-speed rotation of the liquid, the axial pressure is low, forming a negative pressure. The gas can enter the second-stage swirling chamber 4 by self-inhalation through the air intake pipe 7, forming a gas column at the central axis. The swirling liquid reaches its maximum swirling intensity in the throat section 602 of the Venturi nozzle 6. Through swirling shearing and turbulent pulsation, the gas forms microbubbles. Finally, under some special flow conditions in the expansion section 603 of the Venturi nozzle 6, a gas-liquid two-phase shock wave can be formed. Under the synergistic effect of the shock wave, the microbubbles can be further broken up.

[0031] like Figure 3 As shown, the working principle of the second implementation structure is the same as that of the first implementation structure. Based on the first implementation structure, the secondary swirling cavity (at this time, the secondary swirling cavity and the converging section of the Venturi nozzle coincide) is further adjusted from a cylinder to a cone. The adjusted structure can make the fluid speed up and swirl more smoothly in the secondary swirling cavity, which can reduce pressure loss.

[0032] like Figure 4 As shown, the working principle of the third implementation structure is the same as that of the second implementation structure. Based on the second implementation structure, the first-stage swirl chamber is further adjusted from an annular cavity (with the fluid flow area remaining unchanged) to a cavity surrounded by two frustums (with the fluid flow area continuously decreasing). The advantage of the adjusted structure is that the flow space transition is smoother and the pressure drop is further reduced.

[0033] The fourth implementation structure is based on the first implementation structure, replacing the single-stage vortex cavity with a uniform cross-section with an annular cavity formed by two frustum surfaces (the fluid flow area remains unchanged).

[0034] 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 alterations 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-reversing microbubble generator, characterized in that, The swirling-reversing microbubble generator includes an inlet pipe (1), a swirling isolation cylinder (2), a primary swirling chamber (3), a secondary swirling chamber (4), a swirling reversing chamber (5), a Venturi nozzle (6), and an air intake pipe (7); the six parts of the swirling isolation cylinder (2), the primary swirling chamber (3), the secondary swirling chamber (4), the swirling reversing chamber (5), the Venturi nozzle (6), and the air intake pipe (7) are coaxial; the inlet pipe (1) is tangential to the outer edge of the primary swirling chamber (3), and the liquid phase enters the primary swirling chamber (3) tangentially along the circumference of the primary swirling chamber (3) through the inlet pipe (1); the primary swirling chamber (3) is an annular cavity with a uniform cross-section or an annular cavity enclosed by two frustums; a coaxial swirling isolation cylinder (2) of equal height is set inside the primary swirling chamber (3), and the interior of the swirling isolation cylinder (2) is the secondary swirling chamber (4); one end of the primary swirling chamber (3) and the second end of the swirling chamber (4) are connected to the second end of the swirling chamber (5). One end of the first-stage swirling chamber (4) is connected to the swirling reversal chamber (5); the swirling reversal chamber (5) is the fluid flow area where the rotating liquid flow transitions from the first-stage swirling chamber (3) to the second-stage swirling chamber (4), which includes a cylindrical section and a conical section; the air intake tube (7) is inserted into the second-stage swirling chamber (4) from the outside along the central axis of the microbubble generator through the swirling reversal chamber (5); the other end of the second-stage swirling chamber (4) is connected to the Venturi nozzle (6); the Venturi nozzle (6) includes three parts in sequence: a contraction tube section (601), a throat section (602), and an expansion tube section (603); the contraction tube section (601) is directly connected to the other end of the second-stage swirling chamber (4) or extends into the second-stage swirling chamber (4), and when the contraction tube section (601) extends into the second-stage swirling chamber (4), the contraction tube section (601) of the second-stage swirling chamber (4) and the Venturi nozzle (6) overlap.

2. The swirling-reversing 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 circumference of the primary vortex chamber (3). The diameter of the inlet pipe (1) is not greater than the width of the annular cross section of the primary vortex chamber (3).

3. The swirling-reversing microbubble generator according to claim 1 or 2, characterized in that, The height of the cylindrical section of the swirling reversal cavity (5) is greater than or equal to 0.

4. The swirling-reversing microbubble generator according to claim 3, characterized in that, The cone angle of the conical section of the swirling reversal cavity (5) is 3° to 120°.

5. The swirling-reversing microbubble generator according to claim 1, 2, or 4, characterized in that, The ratio of the diameter of the throat segment (602) to the diameter of the cylindrical segment of the swirling reversal cavity (5) is (0.01~0.2):1, and the opening angle of the contraction segment (601) is 20°. o ~150 o The angle of expansion section (603) is 3. o ~20 o .

6. The swirling-reversing microbubble generator according to claim 5, characterized in that, The apex angles of the two frustums are 5°. o ~80 o .

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