JP2000000447A - Swirling type fine bubble generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine bubble generator capable of efficiently generating fine bubbles with a simple structure. SOLUTION: This generator is composed of the vessel main body having a conical or bottle-shaped shape, a liq. inlet tangentially provided to a part of the circumferential face of the inner wall of the space, a gas inlet hole at the space bottom and a swirling gas and liq. outlet opened at the tip of the space. A structure for introducing an energized and swirled water current into a circular containing chamber 3, a structure for forming a swirling upflow at the peripheral part in a gradually expanding lidded cylinder 4 thereabove, a structure for forming a swirling downflow formed inside the peripheral part, a structure for forming a negative-pressure swirling cavity formed at the center thereof by the centrifugal and centripetal separating actions and a gas eddy pipe 24 formed in the negative-pressure swirling cavity, extending, tapering and descending and a fine bubble generating structure in which the eddy pipe 24 is forcedly cut when the pipe 24 rushes and flows into the central reflux port 6 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine particle for efficiently dissolving gas such as air and oxygen gas in tap water, river water, and other liquids, for example, for purifying water quality and reviving a water environment. Belongs to the technical field of bubble generator.

[0002]

2. Description of the Related Art Most of conventional aeration, for example, aeration by a microbubble generator installed in an aquatic organism growth apparatus, grows air from a tubular or plate-like microbubble generator installed in a growth tank. Is it a method to break down bubbles by pressurizing and jetting it into service water, or to put air into a growth water stream where shear force is formed by rotating blades or bubble jets and break it up? Alternatively, air dissolved in water is vaporized by rapid decompression of pressurized water to generate air bubbles. In the aeration by the fine bubble generator having these functions, necessary adjustments are basically made according to the air supply amount and the number of equipment of each fine bubble generator. It is necessary to dissolve such gases in water with high efficiency and further promote circulation of water.

[0003]

However, in the conventional aeration system using a microbubble generator, for example, in a diffuser system using blow-off, no matter how fine pores are provided therein, the bubbles are compressed from the pores. It is ejected in and expands in volume, and due to the surface tension of the bubbles at that time, large bubbles having a diameter of about several mm are generated as a result, and it is difficult to generate bubbles smaller than that. And there existed a problem of clogging which arises with the long-time operation and an increase in power cost. In addition, in a method in which air is introduced into a water flow in which a shear force is formed by a rotating blade or a bubble jet, the air is subdivided, and a high-speed rotation is required to generate cavitation. There are problems such as blade corrosion and vibration that rapidly progress with the occurrence of cavitation, and there is also a problem that the generation rate of fine bubbles is small. Further, in a method in which a gas-liquid two-phase flow collides with other rotating blades and projections, for example, fish and aquatic small organisms are destroyed in lakes, marshes, fish tanks, etc., and the environment required for the growth of aquatic organisms It hindered the formation and maintenance. Furthermore, in the pressurized method,
The device is large and expensive, and the operation cost is also large. And, according to any of the above prior arts,
For example, it was impossible to generate fine bubbles having a diameter of 20 μm or less on an industrial scale.

[0004]

Means for Solving the Problems As a result of intensive studies, the present inventors have made it possible to generate fine bubbles having a diameter of 20 μm or less on an industrial scale by the invention having the following structure. The gist of the present invention is that, as shown in FIG. 12, a principle explanatory view of the device of the present invention, first, a conical space 100 is provided in the device container,
Also, a pressurized liquid inlet 500 is opened in a part of the inner wall circumferential surface of the space in a tangential direction thereof, and a gas inlet 80 is opened in the center of the conical space bottom 300, and the conical shape is formed. A swirl gas-liquid outlet 1 near the top of the space
01 to form a microbubble generator. Therefore, the device main body or at least the swirling gas-liquid outlet 101 is embedded in the liquid, and the pressurized liquid is pressure-fed from the pressurized liquid inlet 500 into the conical space 100, whereby a swirling flow is generated therein. A negative pressure section is formed on the conical tube axis. By this negative pressure, gas is sucked in from the gas introduction hole 80, and the gas passes on the tube axis having the lowest pressure, thereby forming the thin swirling gas cavity 60. In this conical space 100, a swirling flow flows from an inlet (pressurized liquid inlet) 500 to an outlet (swirl gas-liquid outlet) 10.
1, the swirling flow rate and the flow rate toward the outlet simultaneously increase toward the swirling gas-liquid outlet 101 as the cross section of the space 100 decreases. In addition, due to the difference in specific gravity between the liquid and the gas, the centrifugal force acts on the liquid and the centripetal force acts on the gas simultaneously, so that the liquid portion and the gas portion can be separated. Subsequently, the fuel is ejected from there. Simultaneously with the ejection, the surrounding liquid (water) rapidly attenuates the turning, and a sharp turning speed difference occurs before and after the turning. Due to the occurrence of the difference in the swirling speed, the thread-shaped gas cavity 60 is continuously and stably cut, and as a result, a large amount of fine bubbles, for example, fine bubbles having a diameter of 10 to 20 μm are generated near the outlet 101, and It is released into the outside liquid. According to another embodiment, as shown in FIG. 6, for example, inside the covered cylindrical body 4 having a gradually expanding inverted cone (frustum of cone) shape, a swirling rising water liquid flow 20 of a peripheral portion 4a thereof, A triple swirling flow is formed by the swirling descending liquid flow 22 in the inner part and the negative-pressure swirling cavity 23 in the center thereof. A gas vortex tube 24 that swirls down while accumulating a gas component 27 and extending and tapering
And release through the lower central reflux port 6,
Due to the resistance of the discharge passage, a swirling speed difference is generated, and the gas vortex tube itself is forcibly cut to generate fine bubbles.

That is, the configuration of the present invention is as follows. (1) A container body having a conical space, a pressurized liquid introduction port formed in a part of a circumferential surface of an inner wall of the space in a tangential direction, and a gas introduction formed at a bottom of the conical space. A swirling-type microbubble generator, comprising: a hole; and a swirling gas-liquid outlet provided at a top of the conical space. (2) A container body having a frusto-conical space, a pressurized liquid introduction port provided in a part of the inner wall circumferential surface of the space in a tangential direction, and a gas introduction provided at the bottom of the frusto-conical space. A swirling-type microbubble generator, comprising: a hole; and a swirling gas-liquid outlet formed at an upper portion of the truncated conical space. (3) A container body having a space in the shape of a bottle or a wine bottle, a pressurized liquid inlet opening in a part of the inner wall circumferential surface of the space in a tangential direction thereof, and A swirling-type microbubble generator, comprising: a gas inlet opening formed at the bottom of the space; and a swirling gas-liquid outlet opening formed at the top of the liquid-shaped or wine bottle-shaped space. (4) A plurality of pressurized liquid inlets provided in a part of the inner wall circumferential surface of the space in the tangential direction thereof are provided at intervals on the inner wall circumference having the same curvature. 4. The swirling type fine bubble generator according to any one of the above items 1 to 3.

(5) A plurality of pressurized liquid inlets provided in a part of a circumferential surface of the inner wall of the space in a tangential direction thereof are provided at intervals on the inner wall having different curvatures. The swirling microbubble generator according to any one of the preceding items 1 to 4, which is characterized by the following. (6) The swirling type microbubble generation as described in any one of (1) to (5) above, wherein the pressurized liquid introduction port is formed in a part of the inner wall circumferential surface near the bottom of the space. apparatus. (7) The swirl-type microbubble according to any one of (1) to (6) above, wherein the pressurized liquid introduction port is formed in a part of the inner wall circumferential surface near the middle abdomen of the space. Generator. (8) The swirling type fine bubble generator according to any one of the above items (1) to (7), wherein a baffle is arranged immediately before the swirling gas-liquid outlet. (9) A swirl introduction structure for the water flow in the circular storage chamber of the lower distribution table, and a swirl rise water flow formation structure formed in the peripheral portion inside the closed cylindrical body gradually expanding upwardly attached to the upper part thereof. And a swirling descending liquid flow forming structure formed at a portion inside the peripheral portion thereof, and formed at a central portion of the covered cylindrical body by a far centrifugal separation effect of the swirling rising water liquid flow and the swirling descending liquid liquid flow. The negative pressure swirling cavity, and the negative pressure swirling cavity,
As the gas self-primed from the gas self-priming tube attached to the center of the upper lid and the gas part eluted from the swirling water flow accumulate, a swirling-down gas vortex tube is formed, and its elongation and taper are formed. Gas vortex tube formation structure and its extension,
When the tapered and descending gas vortex tube swirls into the central return opening at the bottom of the circular storage chamber, it receives the discharge passage pit, lowers its swirling speed, and generates a swirling speed difference. A micro-bubble generating structure in which the gas vortex tube is forcibly cut to generate micro-bubbles, and the generated micro-bubbles are included in the swirling descending liquid flow, and are discharged from the side discharge port to the outside as a swirling jet. And a swirling jet discharge structure.

(10) A circular storage chamber is recessed above the lower circulation table, and a water liquid flow inlet is opened in the circular storage chamber from the side in a tangential direction to the inner peripheral surface. 10. The swivel-type fine structure according to the above item 9, comprising a water-liquid-flow swirling introduction structure of a circular accommodating chamber, which is configured to connect the pump to the introduction pipe to urge and introduce the water-liquid flow. Bubble generator. (11) On the upper part of the circular storage chamber, a covered cylindrical body having a gradually expanding shape is attached upright, and the swirling introduction flow of the lower circular storage chamber is fed into the upper part of the circular storage chamber. The portion is swirled up to form a swirling rising water liquid flow, and the swirling rising water liquid flow that has reached its upper limit is returned to a portion inside the peripheral portion and swirled down to form a swirling descent water liquid flow. 9. The method according to item 9 or 10 above, further comprising a double swirling water liquid flow forming structure of a swirling ascending water liquid flow and a swirling and descending water liquid flow inside the covered cylindrical body having an upwardly expanded shape. The revolving microbubble generator according to the above description. (12) The centrifugal separation action of the double swirling flow of the swirling upward liquid flow and the swirling downward liquid flow inside the gradually expanding shape closed cylindrical body forms a negative pressure swirling cavity at the center thereof. A gas vortex tube forming structure is formed in which a self-intake body and gas components eluted from the swirling flow are accumulated in the negative pressure swirling cavity, and a gas swirling and descending while expanding and tapering is formed. 12. The revolving microbubble generator according to the above item 11, which is provided. (13) A central return hole is dug in the center of the bottom of the circular storage chamber, and a discharge passage extends from the return port toward the side discharge port of the distribution table. A gas vortex tube that swivels down while extending and tapering the part,
When entering and exiting the central recirculation port, the resistance of the discharge passage reduces the swirl speed, creating a swirl speed difference between the top and bottom of the swirl tube, which forcibly forces the swirl tube. 9 to 12 characterized by comprising a fine bubble generating structure which is cut to generate fine bubbles.
The revolving microbubble generator according to any one of the above.

(14) A plurality of side discharge ports are radially penetrated through the central return port, and a gas vortex tube that pivots down the central portion of the covered cylinder is disposed in the central reflux direction in the order of the pivot direction. From the mouth toward the plurality of side discharge ports, and during the turning, generation of passage resistance due to feeding into the side discharge port and generation of passage resistance due to collision with the adjacent side wall of the return port, The structure described in any one of the above items 9 to 13, wherein a plurality of times are alternately repeated, and each time, a swirling speed difference is generated above and below the vortex tube to cut the vortex tube so that fine bubbles are generated. The revolving microbubble generator according to any one of the above items. (15) The discharge connecting pipe connected to the side discharge opening of the distribution table is formed by bending and projecting the discharge direction in accordance with the swirl flow forming direction in the covered cylinder. Or a revolving microbubble generator according to item 14. (16) A container body having a conical space, a pressurized liquid introduction port formed in a part of a circumferential surface of an inner wall of the space in a tangential direction thereof, and a gas introduction formed at a bottom of the conical space. A micro-bubble generator is constituted by a hole and a swirling gas-liquid outlet formed at the top of the conical space, and the formation of a gas vortex tube that extends and tapers while extending and tapering in the conical space is firstly described. A swirl-type microbubble generation process, wherein a swirling speed difference is generated between the front and rear of the gas swirl tube and the generation of fine bubbles by forcibly cutting the gas swirl tube is defined as a second process. Method.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the present invention, as shown in FIG. 12, which illustrates the principle of the present invention, first, a conical space 100 is provided in the device container, and a part of the inner wall circumferential surface of the space is pressurized liquid tangentially. An inlet 500 is opened, a gas inlet 80 is opened in the center of the bottom 300 of the conical space, and a swirling gas-liquid outlet 101 is provided near the top of the conical space to form a fine bubble generator. Is configured. Therefore, the device main body or at least the swirling gas-liquid outlet 101 is embedded in the liquid, and the pressurized liquid is pressure-fed from the pressurized liquid inlet 500 into the conical space 100, whereby a swirling flow is generated therein. Generate
A negative pressure section is formed on the conical tube axis. By this negative pressure, gas is sucked in from the gas introduction hole 80, and the gas passes on the tube axis having the lowest pressure, thereby forming the thin swirling gas cavity 60. This conical space 1
At 00, a swirling flow is formed from the inlet (pressurized liquid inlet) 500 to the outlet (swirl gas-liquid outlet) 101. As the cross section of the space 100 decreases, the swirling flow rate increases toward the swirling gas-liquid outlet 101. And the flow velocity toward the outlet increase simultaneously. In addition, due to the difference in specific gravity between the liquid and the gas, the centrifugal force acts on the liquid and the centripetal force acts on the gas simultaneously, so that the liquid portion and the gas portion can be separated. Subsequently, the liquid is ejected from there, and at the same time as the ejection, the surrounding liquid (for example, water) rapidly attenuates the turning, and a sharp turning speed difference occurs before and after that. Due to the occurrence of the difference in the swirling speed, the thread-shaped gas cavity 60 is continuously and stably cut, and as a result, a large amount of fine bubbles, for example, having a diameter of 10 to 10 μm.
Fine bubbles of 20 μm are generated in the vicinity of the outlet 101 and are discharged outside the vessel into the liquid.

According to another embodiment, for example, as shown in FIG. 6, a covered cylindrical body 4 having a shape of a gradually expanding inverted cone (a truncated cone) is formed.
Inside the swirl rising water liquid flow 20 around the peripheral portion 4a.
And a swirling descending liquid flow 22 in the inner part thereof and a negative-pressure swirling cavity 23 in the center thereof form a triple swirling flow. 26 and the eluted gas component 27 are collected to form a gas vortex tube 24 that swirls and descends while extending and tapering. When the gas is discharged through the lower central reflux port 6, it receives the resistance of the discharge passage and generates a swirling speed difference. Is generated, the gas vortex tube itself is forcibly cut, and fine bubbles are generated.

FIG. 12 is a view for explaining the principle of the apparatus of the present invention. FIG. 12 (a) is a side view, and FIG. 12 (b) is a sectional view taken along line AA of FIG. The apparatus according to the present invention is configured such that a conical space 100 is provided in the main body container of the apparatus, and a pressurized liquid inlet 500 is provided in a part of the inner wall circumferential surface of the space in the tangential direction.
And a gas inlet 80 is opened in the center of the conical space bottom 300, and a swirling gas-liquid outlet 101 is provided near the top of the conical space. Usually, the main body of the present invention or at least the swirling gas-liquid outlet 101 is buried in the liquid. In the present invention, the device main body may be installed while being buried in a liquid, or may be installed so as to circumscribe a water tank. In the present invention, water is usually used as the liquid, and air is used as the gas, but other liquids include solvents such as toluene, acetone, and alcohol, fuels such as petroleum and gasoline, edible fats and oils, butter, and ice cream. Food and beverages such as beer,
Chemicals such as drinks, health supplies such as bath water, environmental water such as lake water, contaminated water from septic tanks, etc. can be used, and other gases such as hydrogen, inert gases such as argon and radon, and oxidizing agents such as oxygen and ozone. Acid gases such as carbon dioxide, hydrogen chloride, sulfurous acid gas, nitric oxide and hydrogen sulfide gas, and alkaline gases such as ammonia can be used. In the figure, Pa is the pressure in the swirling liquid portion in the conical space, Pb is the pressure in the swirling gas portion, Pc is the pressure in the swirling gas portion near the gas introduction portion,
Pd is the pressure in the swirling gas section near the outlet, and Pe is the pressure in the swirling liquid section at the outlet.

Therefore, by tangentially pumping the pressurized liquid from the pressurized liquid inlet 500 into the conical space 100, a swirling flow is formed from the inlet 500 toward the swirling gas-liquid outlet 101, As the sectional area decreases, the swirling flow rate and the flow rate toward the outlet increase simultaneously toward the outlet 101. In addition, centrifugal force acts on the liquid and centripetal force acts on the gas at the same time due to the difference in specific gravity between the liquid and the gas, resulting in the separation of the liquid part and the gas part. It will go out to the exit 101 continuously. Then, the gas is automatically sucked from the gas introduction hole 80 (self-priming), and the gas is taken into the swirling gas-liquid flow as the thin swirling cavity 60. Thus,
The thread-like thin gas swirling cavity 60 at the center and the surrounding liquid swirling fluid are ejected from the outlet 101, and at the same time as the ejection, the swirling is rapidly attenuated by the surrounding static liquid, and before and after that, the swirling is sharply reduced. Large turning speed difference occurs. Due to the generation of the swirling speed difference, the thread-shaped gas cavity 60 at the center of the swirling flow is continuously and stably cut, and as a result, a large amount of microbubbles, for example, microbubbles having a diameter of 10 to 20 μm, are formed near the outlet 101. Occurs in

[0013] In FIG. 12, the diameter _{d 1} of the swirling gas-liquid outlet 101, the diameter _{d 2} of the conical space bottom 300, while hole diameter _{d 3,} turning the gas-liquid outlet 101 to the conical space bottom 300 of the gas introduction hole 80 The preferred correlation equation for the distance L is: d ₂ / d ₁ ≒ 10 to 15, L ≒ 1.5 to 2.0 × d
₂ , and the numerical range depending on the model is as follows. In the case of a medium-sized pump, for example, the pump has a motor of 2 kw, a discharge rate of 200 liters / min, and a head of 40 m. Using this, a large amount of fine bubbles can be generated.
5 m ³ of about 1cm across the water surface of the tank volume the thickness of the fine bubbles are accumulated during operation. This apparatus was applicable to water purification of ponds having a volume of 2000 m ³ or more. In the case of a small size, for example, the pump has a motor of about 30 w and a discharge rate of 20 liter / min, and can be used in a water tank having a volume of about 1 to ³⁰ m3. In addition, when it is applied to seawater, the use conditions can be further expanded because microbubbles are very easily generated. FIG.
FIG. 4 is a graph showing the diameter of bubbles and the frequency distribution of the bubbles as a result of burying the medium-sized apparatus of the present invention in water and employing air as a gas to generate fine bubbles. In addition,
The results in the case where the amount of air suction from the gas introduction pipe 80 was adjusted were also shown. In the figure, even when the air suction amount is 0 cm ³ / s, the generation of bubbles having a diameter of 10 to 20 μm is presumed to be caused by the separation of the air dissolved in the water. Therefore, the device of the present invention can also be used as a degassing device for dissolved gas.

Thus, the apparatus of the present invention is installed in a liquid,
For example, via a pressurized liquid introduction pipe 50 via a water pump,
By supplying a pressurized liquid (for example, pressurized water) into the conical space 100 from the pressurized liquid inlet 500 and connecting a gas inlet pipe (for example, air pipe) to the gas inlet 80 from the outside, the liquid (E.g., water)
m micro bubbles can be easily generated and supplied. The space does not necessarily have to be a conical shape, but a cylindrical shape having a gradually increasing (or decreasing) diameter, such as a bottle shape or a wine bottle shape as shown in FIG. Is also good. In addition, the generation state of bubbles can be controlled by adjusting a gas flow rate control valve (not shown) connected to the tip of the gas introduction pipe 80,
It is possible to easily control the generation of the desired optimum fine bubbles. In addition, bubbles larger than 10 to 20 μm in diameter
It can be easily generated by this adjustment. Controlling the diameter of the generated bubble is achieved by using a fine bubble with a size of about several hundred μm.
Microbubbles of 10 to 20 μm can be generated in a state where they are not extremely reduced.

FIG. 13 shows pressurized liquid introduction pipes 50, 5
0 ′ is near the bottom 300 side of the space and the swirling gas-liquid outlet 1
01 (that is, a plurality of tangential directions are provided at intervals on the inner wall circumference having different curvatures of the inner wall circumference), and the liquid introduction pressure from the left-side pressurized liquid introduction port 500 ′ is provided. Is supplied at a pressure significantly higher than the pressure introduced from the pressurized liquid inlet 500 on the right side, thereby greatly increasing the number of swirls of the liquid on the left side, thereby promoting the generation of finer bubbles. Is also a thing. In this way, by adjusting the pressure of the pressurized water from both pressurized liquid introduction ports 500 and 500 ′, bubbles having an arbitrary particle size can be generated. Note that reference numeral 200 denotes a baffle plate (baffle plate), which helps to promote generation and diffusion of fine bubbles.

Next, a microbubble generator according to another embodiment of the present invention will be described. 1 is a front view of a revolving microbubble generating apparatus according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a longitudinal sectional view at the center thereof (sectional view taken along the line BB in FIG. 2), and FIG. FIG. 5 is a cross-sectional view of the distribution table (a cross-sectional view taken along the line A-A in FIG. 1);
Is an explanatory view of the triple swirling flow in the XX section inside the cylindrical body, FIG. 6 is an explanatory view of the swirling up-down flow and the gas vortex tube also in the YY section, and FIG. 8 and FIG. 8 are explanatory views of a fine bubble generation structure having four side discharge ports, FIG. 9 is a view illustrating a generation structure at the first side discharge port of FIG. 8, and FIG. 10 is a first side view of FIG. FIG. 11 is an explanatory view of a generating structure at a side wall adjacent to the discharge port, and FIG. 11 is an explanatory view of a generating structure at a second side discharge port.
FIG. 6 is an explanatory view of an installation state of the apparatus in a water tank. In the figure, 1
Is a revolving microbubble generator, 2 is a lower distribution table, 3 is a circular storage chamber, 4 is a covered cylinder, 5 is a water liquid flow inlet, 6 is a central reflux port, 7 is a side discharge port, and 8 is a gaseous source. A suction pipe, 20 is a swirling upward water liquid flow, 22 is a swirling downward water liquid flow, 23 is a negative pressure swirling cavity, 24 is a gas vortex tube, and 25 is a cutting part.

The structure of the revolving microbubble generator 1 according to the present invention can be roughly classified into a water liquid flow swirling introduction structure for urging and introducing a water liquid flow into the circular storage chamber 3 of the lower distribution table 2 as shown in the figure. , Upwardly expanding shape attached to the upper part of the circular storage chamber 3
Peripheral portion 4a inside ₍ inverted conical shape ₎ covered cylindrical body 4
Swirl rising water liquid flow forming structure formed in
, a swirling descending liquid flow forming structure formed in the inner part 4b, and the swirling rising liquid liquid flow 20 and the swirling descending liquid liquid flow 2
By the centrifugal separation effect of the double swirling flow of 2, the negative pressure swirling cavity 23 formed in the center portion 4c thereof, and the self-intake body 26 and the eluted gas 27 are supplied to the negative pressure swirling cavity 23. The gas vortex tube 24 is formed integrally, and is swirled down while extending and tapering. When the gas vortex tube 24 enters the central return port 6, the gas vortex tube receives resistance, and the upper and lower portions 24 a,
b, a swirl velocity difference is generated between the swirl tubes 24, the swirl tube 24 is forcibly cut, and a microbubble generating structure that generates microbubbles, and the generated microbubbles are included in the swirling descending water flow.
And a swirling jet discharge structure configured to be discharged from the side discharge port 7 as a swirling jet.

At the center of the upper part of the cubic lower distribution table 2, a circular storage chamber 3 is recessed, and an inner peripheral surface 3a of the circular storage chamber 3 is provided with a water liquid inlet 5 from the side. It is opened tangentially to the inner peripheral surface 3a. In addition, a pump 11 (FIG. 16) for supplying a liquid solution and a flow control valve 12 (which may be disposed outside the vessel rather than in the water) are provided at the water pipe connecting member 5a protruding from the outside inlet of the inlet 5. ) Is installed on the way.
And a water liquid flow is urged into the inner peripheral surface 3a of the circular storage chamber 3 from a tangential direction in a counterclockwise direction to form a swirling introduction flow in the direction D (counterclockwise) shown in the drawing. I have.

A straight cylindrical portion 42 at the lower end of the cylindrical body is fitted into the opened upper step of the circular storage chamber 3.
A covered cylindrical body 4 having the cylindrical body formed in an inverted conical shape gradually expanding upward and upward is attached upright. Reference numeral 41 denotes the flat upper lid, and the central axis (C to C) of the upper lid 41
A gas suction pipe 8 is inserted downward, and a gas is self-sucked into a negative-pressure swirling cavity 23 formed in a central portion 4c described later. Further, as described above, the gas-liquid mixed flow swirled into the circular storage chamber 3 in the direction of arrow D is sent into the covered cylindrical body 4 while maintaining the swirling force,
The inner peripheral portion 4b is swirled and raised, and the swirling ascending water liquid flow 20
To form Further, the swirling rising water flow reaches the upper limit of the cylindrical body 4 while gradually increasing the swirling speed along the inner peripheral surface of the gradually expanding cylindrical body, and the inner part 4a of the peripheral part 4a.
After returning to b, the swirling descent is started to form a swirling descent water liquid stream 22. Next, a negative-pressure swirling cavity 23 is formed in the central portion 4c of the cylindrical body 4 by the far centrifugal separation action of the double swirling flow of the swirling upward water liquid flow 20 and the swirling downward water liquid flow 22.

The swirling and descending liquid flow 22 which swirls and descends around the swirling and descending negative pressure swirling cavity 23 has an inverted conical shape of the cylindrical body 4 on the central axis (C-C). As a result, each turning speed is increased and each internal pressure is reduced. Accordingly, although the shape of the swirling cavity 23 of the central portion 4c is elongated and tapered, the internal pressure is further reduced with the elongation, and the swirling descent water flow 2 swirling around.
From 2, the air contained in the water stream is eluted. On the other hand, air is self-sucked through the gas self-suction tube 8 into the swirling-down negative-pressure swirling cavity 23. The self-intake body 26 and the gas 2 eluted from the swirling flow
7 are accumulated in the swirling cavity 23 of the negative pressure, and a gas vortex tube 24 that swirls and descends while extending and tapering is formed.

The formation of the gas vortex tube 24 that swirls down on the central axis (C to C) alone does not generate fine bubbles. As shown in FIG. 7, the microbubble generating device 1 of the present invention utilizes the resistance of the discharge passage of the gas vortex tube 24 in the process of discharging the gas vortex tube 24 through the central reflux port 6 to the outside. Gas vortex tube 2
4 to generate a turning speed difference between the upper and lower 24a, 24b,
The gas vortex tube 24 is forcibly torsionally cut to generate fine bubbles. The gas vortex tube 24
The smaller the diameter of the cross section, the better the conditions for the formation of fine bubbles. Further, the control of the cross-sectional diameter can be easily controlled by operating the self-priming amount of the air from the gas self-priming tube 8 by the flow control valve 12 (FIG. 16). The larger the amount of self-priming of air, the larger the cross-sectional diameter of the gas vortex tube, and becomes the minimum when the amount of self-priming is zero. When the self-intake body is zero, the gas vortex tube 24 is formed only by the eluted gas 27 from the swirling descending liquid flow 22, but in the case of purifying the sewage with a small amount of dissolved oxygen, attention should be paid to the purifying ability. is necessary. As described above, the structure for generating fine bubbles in the device 1 of the present invention is based on the gas vortex tube
Is formed as the first step, and the gas vortex tube 24 that swirls and descends while extending and tapering is caused to generate a swirl speed difference between the upper and lower portions 24a and 24b of the vortex tube due to the resistance of the discharge passage, thereby forcibly. The generation of fine bubbles by torsional cutting is configured as the second step.

Further, in the present apparatus 1, the central axis (c) of the bottom 3b of the lower circular storage chamber 3 serves as a discharge passage for discharging the swirling descent liquid flow 22 swirling and descending in the cylindrical body 4 to the outside.
-C), the central return port 6 is bored vertically, and four side discharge ports 7 are radially penetrated from the central return port 6 toward four side surfaces of the lower distribution table 2. . The fine bubbles generated by cutting the swirling and descending gas vortex tube 24 are discharged to the outside together with the swirling and descending water liquid flow 22 from the central return port 6 through the four side discharge ports 7. Has become. Further, the water flow discharged at that time is discharged as a discharge jet 28 which turns while the turning force is being applied. The number of the side discharge ports 7 may be one instead of a plurality. Also, without providing the side discharge ports 7, the gas return pipe 6 is tapered, and the gas vortex tube swirling and descending straight downward from there. The method of discharging the fine bubbles generated by cutting 24 and the swirling descending liquid stream 22 also generates fine bubbles.

Based on the illustrations shown in FIGS. 8 to 11, four side discharge ports 71, 72, 73, 74 are provided at the central return port 6.
The generation structure of fine bubbles when having the following will be described below.
The gas vortex tube 24 that swirls down the central portion 4c of the covered cylinder 4 together with the swirl-down water liquid flow 22 has four side discharges from the central return port 6 in the order of the swirl direction (as viewed in the direction of arrow D). It is sent toward outlets 71, 72, 73, 74. FIG. 9 shows a state where the light is discharged to the first side discharge port 71. The lower portion 24b of the gas vortex tube receives the passage resistance due to the feeding and lowers the swirling speed, and the upper portion 2b of the gas vortex tube.
A swirl speed difference is generated between the vortex tube 4a and the vortex tube, and a microbubble is generated. Reference numeral 25 denotes a cutting portion. FIG.
Shows a state in which the gas vortex tube 24 receives a passage resistance that collides with the adjacent reflux port side wall 6a on the way to the next second side discharge port 72. The lower portion 24b of the gas vortex tube changes the swirling speed by colliding with the side wall 6a, and similarly generates fine bubbles in the cut portion 25. FIG. 11 shows a state in which the gas vortex tube 24 is being discharged to the second discharge port 72. The swirling speed is different from that in FIG. 10, and the cut portion 25 is generated to generate fine bubbles. As mentioned above, 4
Discharge to the side discharge ports 71, 72, 73, 74 of the location,
The collision with each adjacent side wall 6a is alternately repeated four times, and each time, a swirling speed difference is generated between the upper and lower portions 24a, 24b of the vortex tube, and the vortex tube is cut to generate a large amount of fine bubbles.

The number of the side discharge ports 7 is
And the number of turns of the gas vortex tube 24 and the number of cut portions 25.
To enable a high number of turns, use a high pressure pump,
It is necessary to swirl the water liquid at the beginning. As the number of rotations increases, the cut portion (surface) 25 becomes smaller, the gas elutes due to the negative pressure becomes remarkable, and a smaller and larger amount of fine bubbles can be generated. Also the side discharge port 7
The number of microbubbles also increases by increasing the number of microbubbles. From the experimental results, it was found that the optimum number of outlets is also related to the amount of introduced liquid under a certain number of rotations, but the number of outlets is optimal at 40 liters / min and at a head of about 15 m. It is.

A discharge connection pipe 9 is connected to the outlet 7a of the side discharge port 7 of the lower distribution table 2. The discharge connection pipe 9 is formed in a swirling flow forming square (the direction of the arrow D) in the covered cylindrical body 4. Since the discharge direction is bent at 45 ° in the direction of the arrow D to protrude, the discharge type connection is provided when the revolving microbubble generator 1 of the present invention is installed in the water tank 13 (FIG. 16). A circulating flow in the direction of arrow D is generated around the swirling type generator 1, which is discharged as a swirling jet from the pipe 9 into the water tank 13, and the fine bubbles containing oxygen are evenly distributed in the water tank 13. I feel like it. In the device 1 of the present invention, a water stream containing fine bubbles having a bubble diameter of 10 to 20 μm occupying 90% or more was discharged from the discharge port. In addition, when installing in the water tank 13,
The lower distribution table 2 is preferably made of a heavy material, but if it is made of plastic, a heavy stainless steel plate may be further attached to its bottom. Further, when the covered cylindrical body 4 is made of a transparent material, there is an advantage that the formation of a swirling upward water liquid flow and the like and the formation of a downward reflux thereof are observed.

The constituent material of the device of the present invention may be plastic, metal, glass, or the like, and it is preferable that the constituent parts are integrated by bonding, screwing, or the like. The application fields of the microbubbles generated by the apparatus of the present invention include the following. . Purification of water quality in water bodies such as dam lakes, lakes, ponds, rivers, and the sea, and maintenance of the natural environment by raising living organisms. . Purification of artificial natural waters such as biotopes and breeding of organisms such as fireflies and aquatic plants. . Industrial use. High temperature diffusion in steelmaking of steelmaking, promotion of acid cleaning of stainless steel plate and stainless steel wire Removal of organic matter in ultrapure water production plant, removal of organic matter in contaminated water by fine ozone generation, increase of dissolved oxygen, sterilization, synthetic resin foam For example, production of urethane foam, treatment of various waste liquids, promotion of mixing of ethylene oxide with water in a sterilization / sterilization device using ethylene oxide, emulsification of a defoamer, and aeration of contaminated water in an activated sludge treatment method. . Agriculture Improvement of the amount of oxygen and dissolved oxygen used for hydroponics and improvement of the harvest rate. . Fisheries Eel cultivation, squid tank life maintenance, yellowtail cultivation, artificial creation of seaweed beds, cultivation of fish and shellfish, prevention of red tide occurrence. . Medical field Apply to bathtub water to form a fine bubble bath, promote blood flow, and keep bathtub water warm.

[0027]

According to the revolving microbubble generator of the present invention, microbubbles can be easily generated on an industrial scale.
It is easy to manufacture because of its relatively small size and simple device structure, and effectively contributes to water purification of ponds, lakes, marshes, dams, rivers, etc., sewage treatment by microorganisms, and cultivation of fish, aquatic animals, etc. It is.

[Brief description of the drawings]

FIG. 1 is a front view of a revolving microbubble generator according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a longitudinal sectional view at the center (a sectional view taken along the line BB in FIG. 2).

FIG. 4 is a cross-sectional view (A-A cross-sectional view of FIG. 1) of the lower distribution table.

FIG. 5 is an explanatory view of a triple swirling flow in a section X-X inside the covered cylindrical body.

FIG. 6 is an explanatory view of a swirling up-down flow and a gas vortex tube in a section Y-Y.

FIG. 7 is an explanatory diagram of generation of fine bubbles in a gas vortex tube.

FIG. 8 is an explanatory view of a microbubble generation structure when the central reflux port has four side discharge ports.

FIG. 9 is an explanatory diagram of a generating structure at a first side discharge port of FIG. 8;

FIG. 10 is an explanatory view of a generation structure on a side wall adjacent to the first side emission port of FIG. 8;

FIG. 11 is an explanatory view of a generating structure at a second side discharge port of FIG. 8;

FIG. 12 is a view for explaining the principle of the present invention and a view for explaining an apparatus according to another embodiment.

FIG. 13 is an explanatory view of another improved embodiment device of the present invention.

FIG. 14 is an explanatory view of a device according to still another embodiment of the present invention.

FIG. 15 is a graph showing the diameter of bubbles and their occurrence frequency distribution as a result of burying the medium-sized apparatus of the present invention in water and employing air as a gas to generate fine bubbles.

FIG. 16 is an explanatory diagram of an installation state of the apparatus according to the embodiment of the present invention in a water tank.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Revolving fine bubble generator 2 Lower circulation table 3 Circular accommodation room 3a Inner peripheral surface 3b Bottom part 4 Covered cylindrical body 4a Peripheral part 4b Inner part of peripheral part 4c Central part 5 Water liquid inlet 5a Water pipe connector 6 Central reflux port 6a Side wall 7 Side discharge port 7a Discharge port outlet 8 Gas self-priming pipe 9 Discharge connection pipe 10 Water guide pipe 11 Pump 12 Flow control valve 13 Water tank 14 Strainer 15 Water liquid 16 Blower 17 Air supply pipe 19 Gravel 20 Swirling rising water liquid Flow 21 Inward Reflux 22 Swirling Down Water Liquid Flow 23 Negative Pressure Swirling Cavity 24 Gas Vortex Tube 24a Upper Part of Gas Vortex Tube 24b Lower Part of Gas Vortex Tube 25 Cutting Part 26 Self-Priming Body 27 Eluted Gas 28 Ejection Jet 41 Top Cover 42 straight tube-shaped portion 50, 50 'pressurized liquid introduction pipe 60 swirling gas cavity 71 first side discharge port 72 second side discharge port 73 third side discharge Outlet 74 Fourth side outlet 80 Gas inlet, 100 conical space, 101 swirl gas-liquid outlet, 200 baffle, 300 bottom of conical space, 500, 500 'Pressurized liquid inlet, C-C Central axis D Swirling flow forming direction Pa Pressure in the swirling liquid portion in the conical space, Pb Pressure in the swirling gas portion, Pressure in the swirling gas portion near the Pc gas introduction portion, Pressure in the swirling gas portion near the Pd outlet, Pe Outlet in the swirling liquid portion Pressure, d ₁ diameter of swirl gas-liquid outlet 101, d ₂ diameter of conical space bottom 300, d ₃ hole diameter of gas inlet 80, L swirl gas-liquid outlet 101-conical space bottom 300
Distance between,

Claims (16)

[Claims] 1. A container body having a conical space, a pressurized liquid introduction port formed in a part of a circumferential surface of an inner wall of the space in a tangential direction, and a bottom formed in a bottom of the conical space. A swirling type microbubble generator, comprising: a gas introducing hole; and a swirling gas-liquid outlet formed at the top of the conical space. 2. A container body having a truncated cone-shaped space;
A pressurized liquid inlet port opened in a part of the inner wall circumferential surface of the space in a tangential direction, a gas inlet port opened at the bottom of the frustoconical space, and a gas inlet port opened at the top of the frustoconical space. And a swirling gas-liquid outlet. 3. A container body having a space in the shape of a bottle or a wine bottle, a pressurized liquid inlet opening in a part of a circumferential surface of an inner wall of the space in a tangential direction thereof, and the bottle in the shape of the bottle or the wine bottle. A swirl-type microbubble generator characterized by comprising a gas inlet hole formed at the bottom of the space having a shape, and a swirling gas-liquid outlet formed at the top of the space having the bottle shape or the wine bottle shape. . 4. A plurality of pressurized liquid inlets provided in a part of a circumferential surface of an inner wall of a space in a tangential direction thereof are provided at intervals on an inner wall of the same curvature. The revolving microbubble generator according to any one of claims 1 to 3. 5. A plurality of pressurized liquid inlets provided in a part of a circumferential surface of an inner wall of a space in a tangential direction thereof are provided at intervals on an inner wall having different curvatures. The revolving microbubble generator according to any one of claims 1 to 4. 6. The swiveling type according to claim 1, wherein the pressurized liquid inlet is formed in a part of the inner wall circumferential surface near the bottom of the space. Microbubble generator. 7. The swirl according to claim 1, wherein the pressurized liquid introduction port is formed in a part of a circumferential surface of an inner wall near a middle part of the space. Type microbubble generator. 8. The swirling type fine bubble generator according to claim 1, wherein a baffle is arranged immediately before the swirling gas-liquid outlet. 9. A water-liquid swirl introduction structure for a circular storage chamber of a lower circulation table, and a swirl rising water-liquid flow formed in a peripheral portion inside a covered cylindrical body having a gradually expanding shape attached to an upper portion thereof. Forming structure, a swirling descending liquid flow forming structure formed at a portion inside the peripheral part thereof, and a central portion of the covered cylindrical body by a centrifugal separation action of the swirling ascending water liquid flow and the swirling descending liquid liquid flow In the negative pressure swirling cavity formed in the above, the gas self-absorbed from the gas self-priming tube attached to the center of the upper lid and the gas eluted from the swirling water flow are accumulated in the negative pressure swirling cavity. ,
A gas vortex tube forming structure in which a swirling and descending gas vortex tube is formed and its extension and taper are formed, and the gas vortex tube which is extended and tapered and descends is a central return port at the bottom of the circular storage chamber. When entering the turn, receiving the shaft of the discharge passage, lowering its turn speed, generating a turn speed difference,
A micro-bubble generating structure in which the gas vortex tube in the same part is forcibly cut to generate micro-bubbles, and the generated micro-bubbles are included in the swirling descending liquid flow, and are discharged outside from the side discharge port as swirling jets And a swirling jet discharge structure as described above. 10. A circular storage chamber is recessed in the upper part of the lower distribution table, and a water liquid flow inlet is opened in the circular storage chamber from the side in a tangential direction to the inner peripheral surface. The swivel-type fine structure according to claim 9, further comprising a water-liquid flow swirl introduction structure of a circular storage chamber, wherein the water-liquid flow is swirled and introduced by connecting a pump to the introduction pipe. Bubble generator. 11. A circular cylinder having a gradually expanding shape which is upwardly attached to the upper portion of the circular storage chamber, and the swirl flow of the lower circular storage chamber is fed thereinto. Is swirled up to form a swirl rising water liquid flow, and the swirl rising water liquid flow that has reached its upper limit is recirculated to a portion inside the surrounding part and swirled down to form a swirling descent water liquid flow. 10. A double swirling water liquid flow forming structure of a swirling ascending water liquid flow and a swirling and descending liquid water flow inside a covered cylindrical body having an upwardly swelling shape formed as described above. Or a swirl type fine bubble generator according to 10 above. 12. A negative pressure swirling cavity is formed at the center portion of the double swirling flow of the swirling upward liquid flow and the downward swirling liquid flow inside the gradually expanding shape closed cylindrical body. A gas vortex tube is formed in which a self-aspirating body and a gas component eluted from the swirling flow are accumulated in the negative-pressure swirling cavity to form a gas that swirls down while expanding and tapering. The swirling type microbubble generator according to claim 11, comprising a structure. 13. A central return hole is dug in the center of the bottom of the circular storage chamber, and a discharge passage is formed through the discharge passage from the return port to a side discharge port of the distribution table. When the gas vortex tube that swirls down while extending and tapering the central portion of the vortex tube enters and exits the central reflux port, it receives the resistance of the discharge passage, reduces its swirling speed, and moves between the top and bottom of the vortex tube. 13. A microbubble generating structure which generates a swirl speed difference, forcibly cuts the vortex tube by the speed difference, and generates a microbubble. The swirling type microbubble generator according to item 1. 14. A gas vortex tube which radially penetrates a plurality of side discharge ports in the central reflux port and which swirls down a central portion of the covered cylinder, in the order of the swirling direction, forms a central reflux port. To the side discharge ports at the plurality of locations, and during the turn, generation of passage resistance due to feeding into the side discharge ports and generation of passage resistance due to collision with the adjacent side wall of the return port, 14. A structure in which a swirling tube is cut by generating a swirling speed difference between the upper and lower sides of the vortex tube each time, and a fine bubble is generated. The revolving microbubble generator according to any one of the above items. 15. A discharge connecting pipe connected to a side discharge port of the distribution table is formed so as to be bent in a discharge direction in accordance with a swirling flow forming direction in the covered cylinder and project. The revolving microbubble generator according to claim 13. 16. A container body having a conical space;
A pressurized liquid introduction port is provided at a part of the inner wall circumferential surface of the space in a tangential direction, a gas introduction hole is provided at a bottom of the conical space, and a gas introduction hole is provided at a top of the conical space. A first step is to form a gas vortex tube that forms a micro-bubble generating device from the swirling gas-liquid outlet and extends and tapers in the conical space, and forms a gas vortex tube that circulates and leads. A swirling type microbubble generation method, wherein a second process is to generate microbubbles by generating a speed difference and forcibly cutting a gas vortex tube.