JP2022043468A - Microbubble generation device - Google Patents

Abstract

To provide a revolving liquid flow type microbubble generation device for generating micro air bubbles, such as microbubbles and nano-bubbles.SOLUTION: A microbubble generation device having conical-shaped appearance includes a conical-shaped outer member, a first columnar member disposed in the outer member, and a second columnar member disposed in the first columnar member. It includes a liquid supply part attached in a circumferential direction of the outer member and having a prescribed angle to generate vortex flow in liquid to be supplied into a space between the outer member and the first columnar member, a gas supply part for causing the vortex flow of the liquid to pass through the first and second columnar members to supply gas to the vortex flow of the liquid supplied into the second columnar member, and a micro air bubble-containing liquid discharge part for discharging gas/liquid with gas mixed with liquid in the second columnar member as micro air bubble-containing liquid containing micro air bubbles to the outside.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fine bubble generator that generates fine bubbles such as microbubbles and nanobubbles.

Today, research on the physical characteristics of microbubbles such as microbubbles and nanobubbles, the mechanism of generation (miniaturization of bubbles), specific uses, and their practical application is rapidly progressing. For example, research on purification and sterilization of contaminated water, cultivation of aquatic organisms such as eels using water containing fine bubbles of micro-order or nano-order, and supply of water containing fine bubbles to paddy fields. Research is also being conducted to improve water quality.

In addition, for example, improvement of oil-contaminated soil by adhering an oil curtain attached to soil particles to the surface of fine bubbles, reduction of hull resistance when the hull advances by blowing out fine bubbles around the hull, and unevenness. Cleaning of the inner and outer walls of a building with a hull, and research on the antibacterial effect of nanobubbled water containing ozone are also being conducted.

Conventionally, as a method for generating fine bubbles, many methods such as a swirling liquid flow method, a pressure melting method, an orifice or a venturi tube method, the use of ultrasonic vibration, and the use of a fine hole filter have been proposed. For example, as an example, a device for generating fine bubbles disclosed in Patent Document 1 is known.

8 (a) and 8 (b) are views for explaining the fine bubble generator, which is a swirling liquid flow type fine bubble generator. The figure (b) is a vertical sectional view of the figure (a).

The fine bubble generator 50 is composed of an outer shell tank 51 provided with a liquid supply port 51a and a gas supply port 51b, and a gas generation tank 52 covered with the outer shell tank 51. The gas generation tank 52 has a cylindrical shape. A plurality of injection holes 52a and 52b for injecting water mixed with bubbles, which will be described later, are provided in the tangential direction of the inner surface.

Then, a desired gas is pressure-fed from the gas supply port 51b by a compressor or the like, water is vigorously supplied from the liquid supply port 51a in the circumferential direction of the outer shell tank 51, and water mixed with bubbles is injected into the outer shell tank 51. do. The bubble-mixed water is taken into the gas generation tank 52 from the injection holes 52a and 52b, and generates a swirling flow in which the bubble-mixed water swirls along the inner peripheral surface of the gas generation tank 52. Due to the shearing force of this swirling flow, the bubbles in the water mixed with bubbles become fine bubbles of microbubbles and are discharged as water containing fine bubbles from the gas / liquid discharge port 53, and are used for, for example, cleaning and sterilization.

JP-A-2015-167946

However, the fine bubble generator 50 requires a compressor for pumping a desired gas to the gas supply port 51b. In addition, sufficient fine bubbles cannot be generated only by the shearing force due to the swirling flow in the gas generation tank 52.
Therefore, the present invention proposes a swirling liquid flow type fine bubble generator capable of sufficiently generating fine bubbles without using a pressure feeding device such as a compressor for pumping gas.

According to the first invention, the above-mentioned problem is a fine bubble generator having a conical appearance, the outer member having a conical shape, the first cylindrical member disposed in the outer member, and the first cylinder member. A second cylindrical member disposed in the cylindrical member of the above, and attached at a predetermined angle with respect to the circumferential direction of the outer member, and a space between the outer member and the first cylindrical member. The liquid supply unit that creates a vortex in the liquid supplied inside, and the vortex of the liquid passes between the first and second cylindrical members and causes gas to flow into the vortex of the liquid supplied into the second cylindrical member. It is provided with a gas supply unit for supplying, and a fine bubble-containing liquid discharge unit for discharging the gas liquid in which the gas is mixed with the liquid as a fine bubble-containing liquid in the second cylindrical member. It is characterized by that.

Further, the outer peripheral surface and the inner peripheral surfaces of the first and second cylindrical members are characterized by being subjected to a vortex generation promoting process for promoting the generation of the vortex flow.

According to the second invention, the above-mentioned problem is a fine bubble generator having a conical appearance, the outer member having a conical shape, the first inner conical member disposed in the outer member, and the first one. It is provided with a second inner conical member disposed in the inner conical member of 1, and is attached at a predetermined angle with respect to the circumferential direction of the outer member, and the outer member and the first inner cone are attached. The liquid supply unit that creates a vortex in the liquid supplied in the space between the members and the vortex of the liquid are supplied into the second internal conical member through between the first and second internal conical members. A gas supply unit that supplies gas to the vortex of the liquid, and a fine bubble-containing liquid discharge that discharges the gas liquid in which the gas is mixed with the liquid in the second conical member to the outside as a fine bubble-containing liquid containing fine bubbles. It is characterized by having a part and.

Further, the outer peripheral surface and the inner peripheral surfaces of the first and second inner conical members are also characterized by being subjected to a vortex generation promoting process for promoting the generation of the vortex.

It is an external view of the fine bubble generator of this embodiment. It is a figure explaining the internal structure of the fine bubble generator of this embodiment. It is a cross-sectional enlarged view of the liquid discharge part containing fine bubbles. (A) is a figure which shows an example of the vortex generation promotion processing formed on the inner peripheral surface of the 1st and 2nd cylindrical members. (B) is a figure which shows an example of a vortex generation promotion processing which is a rectangular shape in which convex and concave grooves are formed at the same interval. (C) is a diagram showing an example of eddy current generation promoting processing in which the cross section of the concave groove has a semicircular shape. (D) is a figure which shows an example of a vortex generation promotion processing which made a convex cross section into a triangular shape which has an upright side and a hypotenuse. It is a system diagram explaining the fine bubble generation system using the fine bubble generation apparatus of this embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is a figure explaining another embodiment of the fine bubble generator of this embodiment. (A) and (b) are diagrams for explaining an example of a conventional fine bubble generator.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external view of the fine bubble generator of the present embodiment. In the figure, the fine bubble generator 1 of the present embodiment has a conical member 2 having a predetermined thickness and an appearance of a conical shape (inverted conical shape), and a gas supply unit provided on the upper surface of the conical member 2. 3. It is composed of a liquid supply unit 4 provided on the upper side surface of the conical member 2, and a fine bubble-containing liquid discharge unit 5 provided on the lower surface of the conical member 2.

A desired gas is supplied to the gas supply unit 3 from a cylinder described later. Further, a predetermined pressure is applied to the liquid supply unit 4 by a pump or the like, and water (or a desired liquid) is supplied from a water tank described later. Further, the air liquid containing the microbubbles or nanobubble fine bubbles generated by the fine bubble generator 1 of this example is discharged from the fine bubble-containing liquid discharge unit 5.

Although water is used in this example as the liquid to be used, it is not limited to water, and may be, for example, alcohols such as methanol, ethanol and propanol, organic solvents such as acetone, hexane and toluene, and mineral oil such as petroleum. In addition, bases such as sodium hydroxide, potassium hydroxide and calcium hydroxide, colloids such as paints and milk, inorganic acids such as hydrochloric acid, sulfuric acid, carbonic acid and phosphoric acid, and organic acids such as acetic acid, citric acid and oxalic acid are used. You may.

The conical member 2 is made of a metal such as stainless steel, a resin, or the like. Further, the gas supply unit 3, the liquid supply unit 4, and the fine bubble-containing liquid discharge unit 5 may be integrally configured with the conical member 2, or may be manufactured separately, and later manufactured by joining or the like. You may. It should be noted that, for example, by using a transparent acrylic resin or the like, it is possible to observe the generation state of bubbles in the apparatus 1.

FIG. 2 is a diagram illustrating the internal configuration of the fine bubble generator 1 (conical member 2) having the appearance configuration. Inside the fine bubble generator 1, the upper surface is shielded by the upper wall 2a of the conical member 2, and the lower surface is shielded by the lower wall 2b of the conical member 2. The internal cylindrical member 7 is provided. From the above internal configuration, the fine bubble generator 1 of this example has an outer layer space (hereinafter, simply referred to as an outer layer) 8a formed between the conical member 2 and the cylindrical member 6, and the cylindrical member 6 and the internal cylindrical member 7. It is provided with a cylindrical middle layer space (hereinafter, simply referred to as an inner layer) 8b formed between the two, and an inner layer space (hereinafter, simply referred to as an inner layer) 8c in the inner cylindrical member 7.

The cylindrical member 6 and the internal cylindrical member 7 are also made of the same material as the conical member 2, and are made of, for example, a metal such as stainless steel or a resin, and are used to prevent oxidation, especially when ozone is used as a gas. , Stainless is recommended.

As shown in FIG. 2, the gas supply unit 3 is arranged in the central portion of the upper surface of the conical member 2, and the gas supply unit 3 is formed with micropores 9 provided so as to penetrate the upper wall 2a. The gas supply unit 3 and the upper part of the inner layer 8c are communicated with each other by 9. As will be described later, the desired gas is sucked into the upper part of the inner layer 8c of the fine bubble generator 1 (conical member 2) through the fine pores 9. The diameter of the micropores 9 is, for example, about 1 to 2 mm.

On the other hand, the liquid supply unit 4 is arranged with a predetermined angle α with respect to the conical member 2, and water or a desired liquid is supplied from a water tank or the like described later. The predetermined angle α is, for example, an angle of 10 ° or more with respect to the conical member 2, and it is easy to supply a liquid such as water to the conical member 2 to generate a rotating vortex in the conical member 2. Optimal angle to do.

On the other hand, the fine bubble-containing liquid discharging portion 5 is provided in the center portion of the lower surface of the conical member 2. FIG. 3 is an enlarged cross-sectional view of the fine bubble-containing liquid discharging portion 5.

The fine bubble-containing liquid discharging portion 5 is provided with an opening 10 formed through the lower wall 2b of the conical member 2, and the air liquid described later is discharged through the opening 10. As shown in the figure, the opening 10 is a columnar opening 10a having a constant diameter up to a predetermined range of the lower wall 2b (for example, about half the thickness of the lower wall 2b), and the opening 10 is outward from the columnar opening 10a. It is composed of an opening 10b that extends like a truncated cone.

By configuring the fine bubble-containing liquid discharge unit 5 in this way, the gas-containing air-liquid is generated into a micro-order or nano-order fine bubble-containing liquid by the inner layer 8c in the fine bubble generator 1. do.

On the other hand, the inner peripheral surfaces of the conical member 2, the cylindrical member 6, and the internal cylindrical member 7 are subjected to eddy current generation promoting processing to promote eddy current generation. In this eddy current generation promotion processing, for example, by uniformly forming minute irregularities on the inner peripheral surfaces of the cylindrical members 6, 7 and the like, pressure loss is suppressed in the flow of water along the inner peripheral surface, and the vortex flow. Promote production.

FIG. 4A is a diagram showing an example of the vortex generation promoting processing 25, in which minute irregularities 26 and 27 are formed over the entire inner peripheral surface of the internal cylindrical member 7 and the like.
This eddy current generation promoting processing has, for example, a rectangular shape in which the convex shape 26 and the concave groove 27 are formed at the same interval as shown in FIG. There is. With this configuration, the height difference of the unevenness causes a frictional action at a level that does not cause a secondary flow of a size that causes a pressure change of the flow with respect to the flow, and water along the inner peripheral surface. The pressure loss of the flow is suppressed and the generation of eddy current is promoted.

As shown in FIG. 3C, the uneven shape of the eddy current generation promoting processing 25 may be a semicircular cross section of the concave groove 27. Further, as shown in FIG. 3D, the cross section of the convex shape 26 may be a triangular shape having an upright side and a hypotenuse.

FIG. 5 is a system diagram illustrating a fine bubble generation system using the fine bubble generation device 1 having the above configuration.
The cylinders 11a, 11b, 11c shown in the figure contain different gases such as air and gases such as ozone, hydrogen, and nitrogen, and the cylinders 11a, 11b, and 11c have valves 12a, 12b, and 12c, respectively. It is attached. Then, by opening any of the valves 12a, 12b, 12c according to the application, the desired gas is supplied to the gas supply unit 3 from the selected cylinders 11a, 11b, 11c.

The valve 12d shown in the figure is a spare valve for use when a cylinder containing another gas is attached.
In the description of the above embodiment, the air stored in the cylinder 31a is used as the gas, but hydrogen, heavy hydrogen, oxygen, ozone, nitrogen, carbon dioxide, chlorine, nitrogen dioxide, and hydrogen sulfide are used in the other cylinders 31b and 31c. , Helium, argon, neon and other rare gases may be stored and used depending on the application.

Note that P1 shown in the figure is a pressure indicator provided in the gas flow path 13, and measures the pressure of the gas flowing through the gas flow path 13. Further, F1 is a flow rate indicator, and measures the gas flow rate supplied to the gas supply unit 3 via the flow path 13.

On the other hand, in the water tank 14, for example, water is stored as a liquid to be supplied to the fine bubble generator 1 of this example, and by opening the valves 14a and 15, the water stored in the water tank 14 is made into fine bubbles. It can be supplied to the generator 1. The water supplied from the water storage tank 14 is supplied from the liquid supply unit 4 described above into the fine bubble generator 1 (conical member 2).

The pump 20 is a device that drives the water stored in the water tank 14 or 16 when it is used. For example, by opening the valves 16a, opening the valves 17 to 19 in sequence, and driving the pump 20, the water accumulated in the water storage tank 16 is returned to the fine bubble generator 1 (conical member 2) and reused. By driving the pump 20, opening the valve 17 toward the water tank 14, and further opening the valve 21, the water accumulated in the water tank 16 can be returned to the water tank 14.

Note that P2 shown in the figure is a pressure indicator provided in the water flow path 22, and measures the water pressure flowing through the water flow path 22. Further, F2 is a flow rate indicator, and measures the flow rate of water supplied to the fine bubble generator 1 (conical member 2) via the flow path 22.

Using the fine bubble generator 1 and the fine bubble generation system having the above configuration, the fine bubble generation process will be described below.
First, water is supplied from the water storage tank 14 to the fine bubble generator 1. Therefore, first, the valves 14a and 15 are opened, and the water stored in the water storage tank 14 is supplied from the liquid supply unit 4 into the fine bubble generator 1 (conical member 2) via the flow path 22.

When water is vigorously supplied to the space of the outer layer 8a in the conical member 2, the water swirls in the circumferential direction of the outer layer 8a to form a swirling flow. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 2 and is a diagram illustrating a flow of water in the fine bubble generator 1.

As shown in the figure, the water supplied into the outer layer 8a swirls vigorously clockwise. At this time, centrifugal force acts on the liquid in the direction indicated by the arrow B due to swirling. Then, the water swirls and flows downward toward the lower wall 2b of the conical member 2.

After that, the water that has reached the lower wall 2b of the conical member 2 flows into the inside of the cylindrical member 6 while maintaining the turning motion. Centrifugal force due to swirling acts on the water flowing into the cylindrical member 6 in the same manner in the direction of arrow B, and the water moves upward along the inner peripheral surface of the cylindrical member 6 and reaches the upper wall 2a.

During this period, as described above, the inner peripheral surfaces of the cylindrical members 6 and 7 and the like are subjected to vortex generation promoting processing as shown in FIGS. 4A to 4D, and the vortex flow in the fine bubble generator 1 is performed. It is possible to promote the generation of a vortex and efficiently generate a vortex.

Then, the water that has reached the upper wall 2a flows in the direction of the arrow shown in FIG. 2, and the pressure is low at the upper center of the inner cylindrical member 7 (inner layer 8c). At this time, gas is supplied to the gas supply unit 3 from the cylinder 11a, and the gas is sucked into the fine bubble generator 1 (internal cylindrical member 7) through the fine holes 9 of the gas supply unit 3.

Then, the sucked gas becomes a gas vortex in the inner layer 8c of the inner cylindrical member 7 and flows toward the lower wall 2b of the conical member 2 while swirling. At this time, the inner diameter of the internal cylindrical member 7 is the narrowest, the rotational force is strengthened, and the centrifugal force due to the swirling of water works the strongest.
As a result, the gas sucked by the swirling water flow becomes a gas vortex and flows into the opening 10 formed in the lower wall 2b.

Then, the gas vortex suddenly becomes unstable in the fine bubble-containing liquid discharge unit 5, and the gas vortex is forcibly cut off to become fine bubbles. That is, due to the structure of the opening 10 in the fine bubble-containing liquid discharge section 5, the gas in the swirling flow is cut into fine bubbles, and when the gas is discharged to the outside from the fine bubble-containing liquid discharge section 5, the atmosphere or liquid Due to the difference in mass from the external environment or the like, a large amount of fine bubbles of microbubbles or nanobubbles in which bubbles are further finely cut are generated.

The fine bubble-containing water containing the fine bubbles of the microbubbles or nanobubbles thus generated is discharged from the fine bubble-containing liquid discharge unit 5 and used for necessary purposes.

After that, by closing the valve 15 and driving the pump 20 to open the valves 16a, 17 to 19, the water discharged to the water storage tank 16 is circulated, and the air from the cylinder 11a is automatically sent to the gas supply unit 3. It can be fed and continuously discharged from the fine bubble-containing liquid discharge unit 5 to be used for a required purpose.

As described above, since the fine bubble generator 1 of this example has a multi-layer structure, it is possible to stably generate fine bubbles even if the pressure or flow velocity of the liquid such as water to be injected is low. Is. Further, since the structure sucks the gas by swirling the liquid such as water, it is not necessary to pressurize the gas when the gas is sent from the cylinder 11 to the gas supply unit 3, and a complicated mechanism for introducing the gas is omitted. can do.

Further, the inner peripheral surfaces of the cylindrical members 6 and 7 of the fine bubble generator 1 of this example are subjected to eddy current generation promotion processing, and the water flow velocity can be accelerated by accelerating the vortex generation. It is possible to promote the production of a liquid containing fine bubbles.

FIG. 7 is a diagram for explaining another embodiment of the fine bubble generator of the present invention, and is a diagram for explaining the internal configuration of the fine bubble generator 31 of the other embodiment. Also in this example, the appearance of the fine bubble generator 31 is a conical shape (inverted conical shape) shown in FIG. 1 of the above-described embodiment.

Similar to the above-described embodiment, the fine bubble generator 31 of this example is provided with a conical member 32, a gas supply unit 33, a liquid supply unit 34, and a fine bubble-containing liquid discharge unit 35, and the gas supply unit 33 is provided. Is supplied with a desired gas from the above-mentioned bomb 11a or the like, water to which a predetermined pressure is applied by the above-mentioned pump 20 is supplied to the liquid supply unit 34, and is generated in the apparatus 31 from the fine bubble-containing liquid discharge unit 35. The fine bubble-containing liquid containing the fine bubbles of the microbubbles and nanobubbles is discharged.

In the figure, the fine bubble generator 31 of this example is composed of a conical member 32 and internal conical members 36 and 37 arranged in the conical member 32. That is, the configuration different from the above-described embodiment is that the internal conical members 36 and 37 are used for the cylindrical member 6 and the internal cylindrical member 7.

Specifically, the internal conical member 36 is used instead of the cylindrical member 6, and the internal conical member 37 is used instead of the internal cylindrical member 7. With this configuration, when water is vigorously supplied to the space of the outer layer 38a in the conical member 32 as described above, the water swirls in the circumferential direction of the outer layer 38a to form a swirling flow, which is indicated by an arrow B. Centrifugal force works in the direction. Then, the water swirls and flows downward toward the lower wall 32b of the conical member 32.

After that, the water reaching the lower wall 32b of the conical member 32 flows into the inside of the internal conical member 36 while maintaining the swirling motion as described above, and the water flowing into the inside of the internal conical member 36 is swirled. Centrifugal force acts in the same direction in the direction of arrow B, and water moves upward along the inner peripheral surface of the inner conical member 36 and reaches the upper wall 32a.

During this period, as described above, the inner peripheral surfaces of the internal conical members 36 and 37 are subjected to vortex generation promoting processing as shown in FIGS. 4A to 4D, and the vortex flow in the fine bubble generator 31 is performed. It is possible to promote the generation of vortex and efficiently generate a vortex.

Then, the water that has reached the upper wall 32a flows in the direction of the arrow shown in FIG. 7, the upper central portion of the inner conical member 37 (inner layer 38c) becomes in a low pressure state, and the gas passes through the micropores 39 of the gas supply portion 33. It is sucked into the inside of the fine bubble generator 31 (internal conical member 37).

Then, the sucked gas becomes a gas vortex in the inner layer 38c of the inner conical member 37 and flows toward the lower wall 2b of the conical member 32 while swirling, and the centrifugal force due to the swirling of water also works strongly to swirl the water flow. The gas sucked into the gas becomes a gas vortex and flows into the opening 40 formed in the lower wall 32b.

Then, the gas vortex suddenly becomes unstable in the fine bubble-containing liquid discharge unit 35, the gas vortex is forcibly cut into fine bubbles, and when the gas vortex is discharged to the outside from the fine bubble-containing liquid discharge unit 35, the atmosphere or liquid. Bubbles are cut into finer particles due to the difference in mass from the external environment, and a large amount of fine bubbles of microbubbles or nanobubbles are generated.

The fine bubble-containing water containing the fine bubbles of the microbubbles or nanobubbles thus generated is discharged from the fine bubble-containing liquid discharge unit 35 as described above, and is used for necessary purposes.

As described above, even with the swirling liquid flow type fine bubble generator 31 of this example, it is possible to stably generate fine bubbles even if the pressure or flow velocity of the liquid such as water to be injected is low. Further, since the structure sucks the gas by swirling the liquid such as water, it is not necessary to pressurize the gas when the gas is sent from the bomb 11 to the gas supply unit 33, and a complicated mechanism for introducing the gas is omitted. can do.

Further, the inner peripheral surfaces of the internal conical members 36 and 37 of the fine bubble generator 31 of this example are subjected to eddy current generation promoting processing, and the water flow velocity is accelerated by accelerating the vortex generation. It is possible to promote the production of a liquid containing fine bubbles.

In the description of the above embodiment, the cylindrical member arranged in the fine bubble generator 1 is two cylinders of the cylinder members 6 and 7, but a cylinder member of three or more cylinders may be provided or configured. A configuration may be provided in which only one cylindrical member is provided.

Similarly, the internal conical members 36 and 37 arranged in the fine bubble generator 31 are also composed of two conical members, but may be configured by providing three or more conical members, or only one internal conical member is provided. It may be configured.

Further, although the device for generating fine bubbles has been described in the description of the present embodiment, the invention may be an invention of a mist generator containing fine bubbles that discharges a liquid containing fine bubbles when the outside is outside air.

Further, in the description of the present embodiment, the inner surface of the cylindrical member or the conical member is subjected to the eddy current generation promoting processing of the uneven shape, but the present invention is not limited to the uneven shape, and the eddy current generation promoting processing of another shape is performed. May be.

1 ... Fine bubble generator 2 ... Conical member 2a ... Upper wall 2b ... Lower wall 3 ... Gas supply unit 4 ... Liquid supply unit 5 ... Fine bubble-containing liquid discharge unit 6 ... Cylindrical member 7 ... Inner conical member 8a ... Outer layer 8b ... Middle layer 8c ... Inner layer 9 ... Micropores 10, 10a, 10b ... Openings 11a, 11b, 11c ... Bombs 12a, 12b , 12c, 12d ... Valve 13 ... Gas flow path 14, 16 ... Water storage tank 14a, 15, 16a, 17-19 ... Valve 20 ... Pump 21 ... Valve 22 ... Liquid flow path 24 ... Water flow 25 ... Vortex generation promotion processing 26 ... Convex 27 ... Concave groove 31 ... Fine bubble generator 32 ... Conical member 32a ... Upper wall 32b ... Lower wall 33 ... Gas supply unit 34 ... Liquid Supply unit 35 ... Fine bubble-containing liquid discharge unit 36 ... Conical member 37 ... Internal conical member 38a ... Outer layer 38b ... Middle layer 38c ... Inner layer 39 ... Micropores 40 ... Opening P1, P2 ... Pressure indicator F1, F2 ... Flow indicator

Claims (6)

It is a fine bubble generator with a conical appearance.
It comprises a conical outer member, a first cylindrical member disposed within the outer member, and a second cylindrical member disposed within the first cylindrical member.
A liquid supply unit that is attached at a predetermined angle with respect to the circumferential direction of the outer member and generates a vortex in the liquid supplied into the space between the outer member and the first cylindrical member.
A gas supply unit that supplies gas to the liquid vortex flow in which the liquid vortex flows between the first and second cylindrical members and is supplied into the second cylindrical member.
A fine bubble-containing liquid discharge portion that discharges an air-liquid in which the gas is mixed with the liquid in the second cylindrical member as a fine bubble-containing liquid containing fine bubbles.
A fine bubble generator characterized by being equipped with. The fine bubble generator according to claim 1, wherein the inner peripheral surfaces of the first and second cylindrical members are subjected to a vortex generation promoting process for promoting the generation of the vortex. The fine bubble generator according to claim 1 or 2, wherein a plurality of the first and second cylindrical members are formed. It is a fine bubble generator with a conical appearance.
It comprises a conical outer member, a first conical member disposed within the outer member, and a second conical member disposed within the first conical member.
A liquid supply unit that is attached at a predetermined angle with respect to the circumferential direction of the outer member and generates a vortex in the liquid supplied into the space between the outer member and the first conical member.
A gas supply unit that supplies gas to the liquid vortex flow in which the liquid vortex flows between the first and second conical members and is supplied into the second conical member.
In the second conical member, a fine bubble-containing liquid discharge portion that discharges an air liquid in which the gas is mixed with the liquid as a fine bubble-containing liquid containing fine bubbles,
A fine bubble generator characterized by being equipped with. The fine bubble generator according to claim 4, wherein the inner peripheral surface of the first and second conical members is subjected to a vortex generation promoting process for promoting the generation of the vortex. The fine bubble generator according to claim 4, wherein a plurality of the first and second conical members are formed.

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