WO2022092221A1

WO2022092221A1 - Microbubble-generating device

Info

Publication number: WO2022092221A1
Application number: PCT/JP2021/039865
Authority: WO
Inventors: 浩神野; 太郎神野
Original assignee: オオノ開發株式会社
Priority date: 2020-11-02
Filing date: 2021-10-28
Publication date: 2022-05-05
Also published as: JP6889957B1; JP2022073914A; JP2022073661A

Abstract

The present invention addresses the problem of obtaining a microbubble-generating device that is capable of enhancing the microbubble generating efficiency. A microbubble-generating device 100 according to the present invention is a device that generates microbubbles, the microbubble-generating device being characterized in that: the device includes a gas-liquid generating unit 100a that generates a swirling flow of a gas-liquid GL by mixing a liquid L and a gas G, a gas-liquid discharging unit 13 that discharges the gas-liquid GL generated by the gas-liquid generating unit 100a, and a bubble atomizing unit 100b that atomizes bubbles in the gas-liquid discharged from the gas-liquid discharging unit 13; the bubble atomizing unit 100b includes a baffle plate 11 disposed so as to face the gas-liquid discharging unit 13 with a gap therebetween and a baffle-plate supporting body 12 having a shaft section that supports the baffle plate 11; a gap S is formed between an inner cavity C of the bubble atomizing unit 100b and the baffle plate 11; the baffle plate 11 has a center through-hole 11a that is positioned at a center thereof and at least one through-hole 11b positioned at positions other than the center; and the shaft section 12a of the baffle supporting body 12 is inserted into the center through-hole 11a.

Description

Fine bubble generator

The present invention relates to an apparatus that generates fine bubbles such as micro bubbles and nano bubbles by refining the bubbles obtained by introducing a gas into a liquid.

Conventionally, a gas-liquid generator that mixes a liquid and a gas to generate a liquid (gas-liquid) containing bubbles has been known. For example, Patent Document 1 describes fine bubbles as an example of such a gas-liquid generator. The generator is disclosed.

The fine bubble generator disclosed in Patent Document 1 includes a container including a conical or truncated cone-shaped space. In this fine bubble generator, the liquid is swirled in the container so that the swirling radius of the liquid gradually becomes smaller, and the liquid is moved from one end side to the other end side of the container from one end side of the container toward the swirling center of the liquid. By introducing air, the liquid (air / liquid) containing fine bubbles is discharged from the air / liquid outlet formed on the other end side of the container.

Japanese Patent No. 4725707

However, in the fine bubble generator disclosed in Patent Document 1, when the amount of fine bubbles generated reaches a peak state, the liquid pressure inside the container becomes lower than the liquid pressure outside the container in the vicinity of the gas / liquid outlet, and the liquid flows back. do. As a result, the generation of fine bubbles cannot be sustained in the peak state, and the amount of fine bubbles generated is settled in the steady state in a state smaller than the peak state, and the generation of fine bubbles cannot be effectively performed. There was a problem.

An object of the present invention is to obtain a fine bubble generator capable of improving the efficiency of fine bubble generation.

The present invention provides the following items.

(Item 1)
A device that generates fine bubbles
A gas-liquid generator that mixes gas with liquid to generate a swirling flow of gas and liquid,
A gas / liquid discharge unit that discharges the air / liquid generated in the gas / liquid generation unit,
It is provided with a bubble miniaturization section for refining the bubbles of the gas solution discharged from the gas / liquid discharge section.
The bubble miniaturization portion includes a baffle plate arranged so as to face the gas / liquid discharge portion via a gap, and a baffle plate support having a shaft portion that supports the baffle plate. A gap is formed between the lumen of the baffle plate and the baffle plate.
The baffle plate has a central through hole located at the center and one or more through holes located outside the center, and the shaft portion of the baffle support is inserted into the central through hole. Bubble generator.

(Item 2)
The fine bubble generator according to item 1, wherein the baffle plate can move in the axial direction of the baffle plate support by a flow rate discharged from the gas / liquid discharge portion.

(Item 3)
The fine bubble generator according to

item

1 or 2, wherein the baffle plate is a substantially disk, and the one or more through holes are a plurality of through holes arranged around the center of the substantially disk.

(Item 4)
The fine bubble generator according to item 3, wherein the center of the one or more through holes is located on the center side of the center between the center of the substantially disk and the outer peripheral edge.

(Item 5)
The fine bubble generator according to any one of items 1 to 4, wherein the shape of the one or more through holes is substantially circular.

According to the present invention, it is possible to obtain an apparatus for generating fine bubbles, which can improve the efficiency of generating fine bubbles.

FIG. 1 is a conceptual diagram for explaining the fine bubble generator 10 of the present invention. FIG. 2A is a diagram for explaining the first type fine bubble generator 100 of the present invention. FIG. 2B is a diagram for explaining the second type of fine bubble generator 200 of the present invention. FIG. 3 is a plan view for explaining the baffle plate 11 used in the fine bubble generator of the present invention. FIG. 4 is a diagram for explaining the fine bubble generator 1000 according to the first embodiment of the present invention. FIG. 5 is a perspective view for explaining a main part of the bubble miniaturization portion 100b including the baffle plate 115 and the baffle plate support 12 in the fine bubble generator 1000 shown in FIG. FIG. 6 is a diagram for explaining the components constituting the fine bubble generator 1000 shown in FIG. FIG. 7 is a vertical sectional view for explaining the operation of the fine bubble generator 1000 shown in FIG.

Hereinafter, the present invention will be described. It should be understood that the terms used herein are used in the meaning commonly used in the art unless otherwise noted. Accordingly, unless otherwise defined, all terminology and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, this specification (including definitions) takes precedence.

In the present specification, "about" means within the range of ± 10% of the number following.

The object of the fine bubble generator of the present invention is to obtain a fine bubble generator capable of improving the efficiency of fine bubble generation, and is a device for generating fine bubbles by mixing a gas with a liquid. A gas-liquid generation section that generates a swirling flow, a gas-liquid discharge section that discharges the gas-liquid generated by the gas-liquid generation section, and a bubble miniaturization that miniaturizes the bubbles of the gas-liquid discharged from the gas-liquid discharge section. The bubble miniaturization portion includes a baffle plate arranged so as to face the gas / liquid discharge portion via a gap, and a baffle plate support having a shaft portion for supporting the baffle plate. A gap is formed between the lumen of the portion and the baffle plate, and the baffle plate has a central through hole located at the center and one or more through holes located outside the center, and the baffle plate has a central through hole. Solves the above-mentioned problems by providing an apparatus in which the shaft portion of the baffle support is inserted.

FIG. 1 is a conceptual diagram for explaining the fine bubble generator 10 of the present invention.

As shown in FIG. 1, the apparatus 10 of the present invention has at least a gas / liquid generation unit 100a that generates a swirling flow of air / liquid, a gas / liquid discharge unit 13 that discharges the generated air / liquid, and the discharged air. A bubble miniaturization unit 100b for miniaturizing liquid bubbles is provided, and the bubble miniaturization unit 100b includes a baffle plate 11 arranged to face the gas-liquid discharge unit via a gap, and a shaft portion that supports the baffle plate. A gap S is formed between the cavity C of the bubble miniaturization portion 100b and the baffle plate 11 including the baffle plate support 12 having 12a, and the baffle plate 11 has a central through hole 11a located at the center. The other configuration is particularly limited as long as it has one or more through holes 11b located outside the center and the shaft portion 12a of the baffle support 12 is inserted into the center through hole 11a. It's not something.

For example, the gas / liquid generation unit may have any form as long as it generates a swirling flow of gas / liquid which is a liquid containing bubbles. For example, it may be a device that generates a swirling flow of gas and liquid by introducing a gas into the swirling flow of liquid in a state where a swirling flow of liquid is formed (first type fine bubble generator), or a liquid. It may be a device (second type fine bubble generator) that generates a swirling flow of gas and liquid by swirling the gas and liquid obtained by mixing gas and gas.

The method of generating the swirling flow may also be generated by driving a swirling fan provided inside the gas / liquid generating section, or in the tangential direction of the annular view of the cross section so that the liquid fluid spirally swirls toward the discharging section. A liquid fluid may be introduced along the line.

The baffle plate 11 may have a central through hole 11a formed at a substantially center thereof and a through hole 11b around the center formed around the substantially center thereof.

Here, the substantially center of the baffle plate 11 is the position of the center of gravity of the baffle plate 11, and when the baffle plate 11 rotates, it rotates around the position of the center of gravity.

The central through hole 11a may be for inserting the shaft portion 12a of the baffle plate support 12 into the central through hole 11a. The central through hole 11a may be large enough to fix the position of the baffle plate 11 with respect to the shaft portion 12a, or the baffle plate 11 may move in a direction perpendicular to the central axis A of the baffle plate support 12. May be of a size that is regulated within a certain range. For example, the size of the central through hole 11a of the baffle plate 11 is larger than the outer circumference of the shaft portion 12a of the baffle plate support 12, and the baffle plate 11 is the flow rate of the gas and liquid discharged from the gas and liquid discharge portion 13. Therefore, the baffle plate support 12 may be movable in the direction of the central axis A, and may be movable within a certain range in the direction perpendicular to the direction of the central axis A of the baffle plate support 12.

The through hole 11b around the center is formed on one surface of the baffle plate 11 (the surface of the baffle plate 11 opposite to the gas / liquid discharge portion 13, for example, the upper surface) and the other surface (gas / liquid discharge of the baffle plate 11). When a pressure difference of a fluid (for example, air or liquid) occurs on the surface on the portion 13 side, for example, the lower surface) side, the air or liquid passes through the baffle plate 11 from one surface side to the other surface side of the baffle plate 11. It is a hole for moving to.

For example, in the bubble miniaturization unit 100b, when the pressure of the gas and liquid on the lower surface side of the baffle plate 11 is lower than that on the upper surface side, the air and liquid discharged from the gas discharge unit 13 passes outside the outer edge of the baffle plate 11. A part of the fluid that has moved from the lower surface side to the upper surface side of the baffle plate 11 returns to the lower surface side of the baffle plate 11 through the through hole 11b around the center. In this case, the air-liquid returned to the lower surface side of the baffle plate 11 is disturbed again by the baffle plate 11, and the air bubbles of the air-liquid are further refined. In particular, those with a small bubble size in the gas and liquid that are swirling flows gather on the outer peripheral side of the lumen of the fine bubble part, but those with a large bubble size gather on the center side of the lumen, so such bubble size The air and liquid in which a large one is present will return to the lower surface side of the baffle plate 11 through the through hole 11b around the center. It is preferable that the through hole 11b around the center is provided on the center side of the lumen as much as possible in order to efficiently return the one having a large bubble size to the lower surface side.

The central through hole 11a has a gap between the central through hole 11a and the shaft portion 12a of the baffle plate support 12 even when the shaft portion 12a of the baffle plate support 12 is inserted into the central through hole 11a. Therefore, it is a flow path of air and liquid from the upper surface side to the lower surface side of the baffle plate 11, but since the baffle plate support 12 is inserted into the central through hole 11a, the opening of the central through hole 11a A part is closed by the shaft portion 12a of the baffle plate support 12. Therefore, the cross-sectional area of the flow path of the central through hole 11a is remarkably narrower than that of the completely open central through hole 11b, and the baffle plate 11 is made from one surface to the other for further miniaturization of gas and liquid. The passage through which the gas and liquid pass toward the surface of the center is not substantially formed by the central through hole 11a but by the through hole 11b around the center.

The material of the baffle plate 11 can be any material. For example, it may be plastic or a metal such as aluminum, iron, or stainless steel. The thickness and weight of the baffle plate 11 are not limited, and can be adjusted to any thickness and weight depending on the required discharge amount of gas-liquid GL, the size of fine bubbles, and the like.

Further, the shape of the baffle plate 11 can be arbitrary. For example, the outer peripheral shape may be a substantially circular shape, a substantially triangular shape, a substantially quadrangle, or a substantially polygonal shape (pentagon or more).

Further, the shape of the through hole 11b around the center of the baffle plate 11 may be arbitrary. For example, the outer peripheral shape may be a substantially circular shape, a substantially triangular shape, a substantially quadrangle, or a substantially polygonal shape (pentagon or more).

Further, the arrangement of the through hole 11b around the center may be arbitrary. The plurality of through holes 11b may be evenly arranged around the central through holes 11a, or may be randomly arranged. Preferably, the through hole 11b around the center is arranged so that the center thereof is closer to the center of the baffle plate 11 than the center between the center and the outer peripheral edge of the baffle plate 11. By doing so, it becomes easy for air and liquid having a large bubble size, which tends to be closer to the center side, to pass through.

In the form shown in FIGS. 1 and 3, the through hole 11b around the center is provided only at the center between the center and the outer peripheral edge or only on the center side from the center, but the present invention is not limited thereto. A through hole 11b around the center may be provided on the outer peripheral side in the same manner.

Also, the size and number of through holes 11b around the center can be arbitrary. Preferably, the through holes 11b have a large size and a large number. As a result, it becomes possible to increase the amount of gas and liquid passing through the through hole 11b, and it becomes possible to generate fine bubbles more efficiently.

For example, the size of the baffle plate 11 can be about 10 mm to about 300 mm, preferably about 20 mm to about 200 mm. Further, for example, the size of the through hole 11b around the center may be about φ2 to 10 mm, preferably about φ3 mm to 5 mm. For example, the number of through holes 11b around the center can be about 4 to about 16, preferably about 8 to about 12. For example, the through hole 11b around the center is located on the center side of about 0.5 mm to about 3 mm, preferably about 1 mm to about 2 mm from the center between the center of the baffle plate 11 and the outer peripheral edge. However, this is just an example, and may be in a numerical range other than that. By setting the size of the baffle plate 11 to about 100 mm or more (for example, about 150 mm), it is possible to eliminate the clogging due to the water quality.

Also, liquids and gases are not limited and can be arbitrary. For example, the liquid may be water or a liquid other than water (for example, alcohol, oil, liquid fuel, etc.). The gas may be air or a gas other than air (for example, carbon dioxide gas, nitrogen gas, oxygen gas, hydrogen gas, helium gas, etc.).

Hereinafter, as a more specific example of the fine bubble generator 10 of the present invention, the first type fine bubble generator 100 and the second type fine bubble generator 200 will be described.

[First type fine bubble generator 100]
FIG. 2A is a diagram for explaining the first type of fine bubble generator 100 of the present invention, and FIG. 2A (a) is a diagram conceptually showing the fine bubble generator, FIG. 2A (FIG. 2A). b) is a perspective view schematically showing the appearance of the fine bubble generator shown in FIG. 2A (a).

The fine bubble generator 100 has a gas / liquid generation unit 100a, a gas / liquid discharge unit 13, a bubble miniaturization unit 100b including a baffle plate 11 and a baffle plate support 12, and a gas / liquid discharge unit 100c. Here, the baffle plate support 12 also has a function as a gas discharge nozzle for supplying gas to the gas / liquid generation unit 100a. This fine bubble generating device 100 is used on land (in the air), and the bubble micronizing section 100b located between the gas / liquid generating section 100a and the gas / liquid discharging section 100c is housed in the sealed space. As described above, the space between the air-liquid generation unit 100a and the air-liquid discharge unit 100c is sealed by the peripheral wall 14. This space is the lumen C of the bubble miniaturization portion 100b, and a gap S is formed between the lumen C and the baffle plate 11.

(Gas and liquid generation unit 100a)
The gas-liquid generation unit 100a temporarily stores and swirls the liquid pumped from the liquid storage unit 4 via the pipe 2 via the pump 3, and swirls the obtained swirling flow of the liquid from the gas discharge nozzle 12. The discharged gas is introduced to generate a swirling flow of gas and liquid. The liquid supplied to the gas-liquid generation unit 100a may be water, and when the target gas-liquid can be generated by the pressure of tap water as the liquid pressure, as shown by the two-point chain line in FIG. 2A. A water pipe 2b provided with a water tap 2b1 may be connected to the gas / liquid generation unit 100a so that water is supplied as a liquid from the water pipe 2b.

(Air / liquid discharge unit 13)
The gas / liquid discharge unit 13 is a portion that discharges the swirling flow of the liquid generated by the gas / liquid generation unit 100a toward the baffle plate 11, and is composed of, for example, a gas / liquid discharge nozzle 13.

(Bubble miniaturization unit 100b)
The bubble miniaturization unit 100b includes the baffle plate 11 and the baffle plate support 12, and the baffle plate 11 approaches or separates from the gas liquid discharge unit 13 depending on the discharge amount of the swirling flow of the gas liquid. It has become like. Therefore, the bubble miniaturization unit 100b is a portion (turbulent flow) in which the swirling flow of the gas and liquid discharged from the gas and liquid discharge unit 13 of the gas and liquid generation unit 100a is disturbed by the baffle plate 11 to refine the bubbles in the gas and liquid. (Generation part).

Further, the baffle plate 11 has, for example, a first through hole (center through hole) 11a formed in the center thereof and a pair of second through holes (through hole around the center) 11b formed around the center. Have. The baffle plate support 12 has a shaft portion 12a at its tip inserted into the central through hole 11a of the baffle plate 11, so that the center of the baffle plate 11 is at least a predetermined distance from the central axis A of the baffle plate support 12. The baffle plate 11 is supported so as not to separate. In this case, the baffle plate 11 can move in the direction of the central axis A of the baffle plate support 12 depending on the flow rate of the air and liquid discharged from the air and liquid discharge unit 13. Further, the through hole 11b around the center of the baffle plate 11 is discharged from the gas / liquid discharge portion 13 and extends beyond the peripheral edge of the baffle plate 11 (that is, the gap S between the lumen C of the bubble miniaturization portion 100b and the baffle plate 11). A part of the swirling flow of the gas-liquid GL toward the gas-liquid discharge unit 100c is returned to the gas-liquid discharge unit 13 side to form a reflux path. When the gas and liquid discharged from the gas and liquid discharge part 13 collide with the gas and liquid returning to the gas and liquid discharge part 13 side by the reflux path through the through hole 11b around the center, further turbulence is generated and the bubbles are fine. Will improve. Further, a part of the swirling flow of the gas-liquid GL returns to the gas-liquid discharge portion 13 side through the through hole 11b around the center, so that a part of the swirling flow of the gas-liquid GL is disturbed by the moving baffle plate 11. The bubbles inside are further refined. Therefore, while the gas liquid discharged from the gas liquid discharge part collides with the baffle plate, it flows into the gap S between the lumen C of the bubble miniaturization part 100b and the baffle plate 11 and flows directly to the gas liquid discharge part 100c. In contrast to the device, the device of the present invention is useful in that the presence of a through hole around the center of the baffle plate enables more efficient miniaturization of bubbles.

As a result, it is possible to generate gas and liquid containing finely divided bubbles (or few large-sized bubbles) that could not be achieved without using a pressurizing device or the like with a conventional device, even with the water pressure of tap water, for example. It became possible (air-liquid discharge part 100c)
The gas / liquid discharge unit 100c is a columnar member such as a columnar member that supports the gas / liquid discharge nozzle 12, and inside the air / liquid discharge unit 100b, the air / liquid whose bubbles have been miniaturized by the bubble miniaturization unit 100b is discharged to the outside of the apparatus. A gas-liquid discharge path 101c is formed for this purpose. Further, a gas introduction port 102c is formed on the peripheral wall surface of the gas-liquid discharge section 100c, and the gas introduction port 102c discharges gas and liquid through the gas introduction path 103c formed inside the gas-liquid discharge section 100c. It is connected to the tip opening 12a (see FIG. 5B) of the nozzle 12.

The gas / liquid discharge unit 100c may be a portion that discharges the gas / liquid that has passed through the bubble miniaturization unit 100b to the outside of the apparatus, and the specific configuration is not particularly limited. Therefore, the gas / liquid discharge unit 100c is not limited to the one made of a columnar member, but may be made of a prismatic member.

Further, when the fine bubble generator 100 is used in the liquid, the gas liquid discharge unit 100c and the peripheral wall 14 are unnecessary, and the fine bubble generator 100 replaces the gas liquid discharge unit 100c composed of a columnar member. It suffices if a support member such as an arm for supporting the gas discharge nozzle 12 is provided. In this case, the gap S between the lumen C of the bubble miniaturization portion 100b and the baffle plate 11 is formed by the liquid pre-existing around the baffle plate 11 so as to surround the region outside the outer edge of the baffle plate 11. The Rukoto.

[Second type fine bubble generator 200]
2B is a diagram for explaining the second type of fine bubble generator 200 of the present invention, FIG. 2B (a) is a diagram conceptually showing this fine bubble generator, and FIG. 2B (? b) is a perspective view schematically showing the appearance of the fine bubble generator shown in FIG. 2B (a).

This second type of fine bubble generator 200 produces the liquid L in that the bubbles are miniaturized by swirling the gas and liquid obtained by mixing the gas G with the liquid L to generate fine bubbles. It is different from the first type fine bubble generator 100 (see FIG. 2A) in which a gas is introduced into the swirling flow of the liquid L in a swirling state to generate fine bubbles.

That is, the second type of fine bubble generator 200, like the first type of fine bubble generator 100, has a gas / liquid generation unit 200a, a gas / liquid discharge unit 13, a baffle plate 11 and a baffle plate support. The bubble micronization unit 200b including the body 22 and the gas / liquid discharge unit 200c are provided, but the gas / liquid generation unit 200a, the bubble micronization unit 200b, and the gas / liquid discharge unit 200c are each of the first type of fineness. Part of the configuration is different from the corresponding air-liquid generation unit 100a, bubble micronization unit 100b, and air-liquid discharge unit 100c in the bubble generator 100.

(Gas and liquid generation unit 200a)
That is, in the fine bubble generator 200, the gas-liquid generation unit 200a has a pipe 2a having a structure different from that of the pipe 2 of the fine bubble generator 100, and this pipe 2a is a liquid L flowing through the main pipe 2a1. The structure is such that the gas G sucked from the branch pipe 2a2 is mixed into the pipe. The gas / liquid generation unit 200a has a fluid swirling unit 201a instead of the gas / liquid generation unit 100a of the fine bubble generator 100, but the fluid swirling unit 201a and the gas / liquid generation unit 100a are introduced in the fluid swirling unit 201a. The fluid to be introduced is a gas-liquid GL, whereas the gas-liquid generation unit 100a is different only in that the fluid to be introduced is a liquid L, and the fluid swirling unit 201a has the same structure as the gas-liquid generation unit 100a. ..

(Bubble miniaturization unit 200b)
The bubble micronization unit 200b of the fine bubble generator 200 has a function as a gas discharge nozzle instead of the baffle plate regulator 12 having a function as a gas discharge nozzle in the bubble miniaturization unit 100b of the fine bubble generator 100. It differs from the bubble miniaturization portion 100b of the fine bubble generator 100 only in that it does not have the baffle plate support 22 and merely has the baffle plate support 22 that regulates the moving range of the baffle plate 11.

(Air / liquid discharge unit 200c)
The gas / liquid discharge unit 200c is not provided with the gas introduction port 102c and the gas introduction path 103c in the gas / liquid discharge unit 100c of the fine bubble generator 100, and only at this point, the gas / liquid discharge unit 200c generates fine bubbles. It is different from the gas / liquid discharge unit 100c of the device 100. Therefore, the gas-liquid discharge unit 200c is formed with a gas-liquid discharge path 201c for discharging the gas-liquid whose bubbles are refined by the bubble miniaturization unit 200b to the outside of the device, similarly to the gas-liquid discharge unit 100c. There is.

Therefore, in the pipe 2a of the second type fine bubble generator 200, the liquid L is sucked up from the liquid storage unit 4 by the main pipe 2a1, the gas G is sucked from the branch pipe 2a2, and the main pipe 2a1 and the branch pipe 2a2 are sucked. The liquid L and the gas G are mixed at the joint with the liquid L to generate gas and liquid.

When the air-liquid generated in the pipe 2a is introduced into the fluid swirling section 201a, it is swirled to generate a swirling flow of the gas-liquid, and the swirling flow of the gas-liquid GL is swirled from the gas-liquid discharge section 13 to the baffle plate 11. It is discharged toward.

The baffle plate 11 has a first through hole 11a formed in the center thereof and a pair of second through holes 11a formed on both sides of the first through hole 11a so as to sandwich the first through hole 11a, as in the case of the fine bubble generator 100. Since it has a through hole 11b, even in this fine bubble generator 200, it is discharged from the gas / liquid discharge section 13 and extends beyond the peripheral edge of the baffle plate 11 (that is, the lumen C of the bubble miniaturization section 100b and the baffle plate 11). A part of the swirling flow of the gas-liquid GL toward the gas-liquid discharge unit 200c (flowing through the gap S) returns to the gas-liquid discharge unit 13 side through the second through hole 11b. When the gas and liquid discharged from the gas and liquid discharge unit 13 collide with the gas and liquid recirculated to the gas and liquid discharge unit 13 by the recirculation path through the through hole 11b around the center, further turbulence is generated and the bubbles are fine. Is improved. Further, a part of the swirling flow of the gas-liquid GL returns to the gas-liquid discharge portion 13 side through the second through hole 11b, so that the bubbles contained therein are further refined.

FIG. 3 is a plan view for explaining the baffle plate 11 used in the fine bubble generator of the present invention, and FIG. 3A shows the baffle plate 11 described with reference to FIG. 2A or FIG. 2B. (B) to FIG. 3 (f) show a baffle plate having a shape different from that of the baffle plate 11 shown in FIG. 2A or FIG. 2B.

(Baffle plate 11)
In the baffle plate 11 shown in FIG. 3A, the first through hole (center through hole) 11a into which the shaft portion (tip portion) 12a or 22a of the

baffle plate regulator

12 or 22 is inserted is the baffle plate 11. The second through hole (through hole around the center) 11b, which is located at the center and forms the reflux path of the gas-liquid GL, is on the circumference C centered on the center of the baffle plate 111, and is on the circumference C of the baffle plate 111. It may be arranged on both sides of the straight line passing through the center of the above so as to be symmetrical with the first through hole 11a interposed therebetween. Here, both the first through hole 11a and the second through hole 11b have a circular shape. Preferably, the center of the second through hole 11b is arranged on the center side of the baffle plate 11 with respect to the center between the outer peripheral edge and the center of the baffle plate 11.

However, the number, arrangement, size, and shape of the second through holes formed in the baffle plate 11 are not limited and may be arbitrary. For example, the number of through holes around the center may be one, eight as shown in FIG. 3 (b), or other odd and even numbers. Further, as shown in FIG. 3C, the intervals of the plurality of through holes may be different from each other.

Further, as shown in FIG. 3D, the through holes around the center may be arranged at different distances from the center of the baffle plate 112.

Further, the shape of the baffle plate is not limited to the circle shown in FIGS. 3 (a) to 3 (d), and may be a quadrangle or the like as shown in FIG. 3 (e).

Further, the shape of the through hole around the center is not limited to the circle shown in FIGS. 3 (a) to 3 (e), and may be a quadrangle or the like as shown in FIG. 3 (f).

However, in the following embodiment, as a fine bubble generator, a first type of device that generates gas and liquid by introducing a gas into a swirling flow of liquid (particularly, the gas and liquid generation unit 100a is a liquid from a water pipe). As a baffle plate, the baffle plate 115 shown in FIG. 3 (b) is mentioned. This made it possible to efficiently generate finely divided gas and liquid only by the pressure of tap water without using other pressurizing devices, as shown by the experimental results described later. Here, the pressure of the water supply is about 0.15 MPa to about 0.74 MPa, preferably the water pressure is about 0.2 MPa to about 0.39 MPa, but the water pressure at the faucet is about from the above value. The water pressure can be reduced by about 0.1 MPa (about 0.1 MPa to about 0.29 MPa).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
4A and 4B are views for explaining the fine bubble generator 1000 according to the first embodiment of the present invention, and FIG. 4A is a side view showing the appearance of the fine bubble generator and FIG. 4B. ) Is a vertical sectional view of the fine bubble generator shown in FIG. 4 (a).

The fine bubble generator 1000 of the first embodiment mixes a gas G (for example, air) with the introduced liquid L (for example, water) to generate a liquid (gas and liquid) containing bubbles, and the generated air. It is a fine bubble generator that creates fine bubbles by refining the bubbles of the liquid. In this embodiment, the liquid is, for example, water and the gas is, for example, air, but the present invention is not limited thereto, and liquids and gases can be arbitrary. For example, the liquid may be alcohol and the gas may be carbon dioxide.

The fine bubble generator 1000 has a gas-liquid generation unit 100a that mixes the liquid L and the gas G to generate a swirling flow of the gas-liquid GL, and a gas-liquid discharge unit that discharges the swirling flow of the generated gas-liquid GL. 13, a bubble miniaturization unit (turbulent flow generation unit) 100b that miniaturizes bubbles contained in the gas-liquid GL by disturbing the swirling flow of the discharged gas-liquid GL, and a gas that discharges the gas-liquid GL to the outside of the device. It is provided with a liquid discharge unit 100c.

Here, the gas / liquid generation unit 100a is provided on the gantry 100d, the bubble miniaturization unit 100b is provided on the gas / liquid generation unit 100a via the gas / liquid discharge unit 13, and further, the bubble miniaturization unit 100b is provided. Is provided with a gas / liquid discharge unit 100c. A peripheral wall 14 forming the cavity C of the bubble miniaturization unit 100b is provided between the bubble miniaturization unit 100b and the gas / liquid generation unit 100a, and the air bubble miniaturization unit 100b has a bubble miniaturization unit 100b. The baffle plate 11 constituting the portion 100b and the gas / liquid discharge nozzle as the gas / liquid discharge portion 13 are arranged, and a gap S is formed between the cavity C of the bubble miniaturization portion 100b and the baffle plate 11. There is.

The gantry 100d has a support flange 101 that supports the gas-liquid generation portion 100a, and a gantry leg portion 21 that extends downward from the support flange 101. A liquid introduction joint 10a is attached to the support flange 101, a water pipe 2b provided with a water tap 2b1 is connected to the liquid introduction joint 10a, and liquid water is supplied to the gas / liquid generation unit 100a from the water pipe. It has become so. A pipe 2 (see FIG. 2A) to which the pump 3 is attached is connected to the liquid introduction joint 10a, and the liquid is sucked up from the liquid storage unit 4 by the pump 3 to the gas-liquid generation unit 100a and pumped to the gas-liquid generation unit 100a. You may try to do it. The support flange 101 is formed with an insertion hole 101a for inserting the gantry leg portion 21 (see FIG. 6).

First, the bubble miniaturization unit 100b including the baffle plate 115, which is a characteristic portion of the fine bubble generator 1000, will be specifically described.

5A and 5B are perspective views for explaining the bubble miniaturization section 100b including the baffle plate 115 in the fine bubble generator 1000 shown in FIG. 4, and FIG. 5A shows the appearance of the bubble miniaturization section 100b. , FIG. 5B shows the bubble miniaturization portion 100b decomposed into a plurality of parts.

The bubble miniaturization unit 100b is provided so as to be movable so as to be close to or away from the discharge port 13b of the gas / liquid discharge nozzle 13 depending on the discharge amount of the swirling flow of the gas / liquid GL discharged from the gas / liquid discharge nozzle 13. It has a baffle plate 115 and a baffle plate support 12 that supports the baffle plate 115 so that the baffle plate 115 does not move beyond a certain range.

Here, the gas / liquid discharge nozzle 13 is a gas / liquid discharge unit that discharges a swirling flow of the gas / liquid GL generated by the gas / liquid generation unit 100a. In the bubble miniaturization section 100b, the lumen C of the bubble miniaturization section 100b is formed by the peripheral wall 14 that seals the space between the gas solution generation section 100a and the gas solution discharge section 100c, and the lumen C and the baffle plate are formed. A gap S is formed between the 11th and the 11th. The baffle plate 115 has a disk shape, and has a first through hole (center through hole) 115a formed in the center thereof and eight second through holes (through holes around the center) formed around the center. ) 115b.

The first through hole 115a is a through hole into which the tip end portion (that is, the shaft portion of the baffle plate support) 12a of the gas discharge nozzle constituting the baffle plate support 12 is inserted (see FIGS. 1 and 5). .. The tip portion 12a of the gas discharge nozzle constituting the baffle plate support 12 is the baffle plate 115.
By being inserted into the center through hole 115a of the baffle plate 115, the movement range of the baffle plate 115 is restricted so that the center of the baffle plate 115 is not separated from the central axis A (see FIG. 1) of the baffle plate support 12 by a predetermined distance or more. .. In this case, the baffle plate 115 can move in the direction of the central axis A of the gas discharge nozzle 12 depending on the flow rate of the gas and liquid discharged from the gas and liquid discharge unit 13.

Further, the eight second through holes 115b located around the center of the baffle plate 115 are through holes located at the apex of the regular octagon, and these through holes around the center 115b are the tips of the gas / liquid discharge nozzle 13. Is discharged from the air-liquid discharge port 13b of the above, beyond the peripheral edge of the baffle plate 115 (that is, flows through the gap S between the cavity C of the bubble micronizing unit 100b and the baffle plate 11) and into the air-liquid discharge unit 100c. It is a through hole forming a return path for returning a part of the swirling flow of the gas-liquid GL to the gas-liquid discharge nozzle 13 side. A part of the swirling flow of the gas-liquid GL returns to the discharge port 13b side of the gas-liquid discharge nozzle 13 through the through hole 115b around the center, so that the reciprocating motion of the baffle plate 11 moves toward and away from the gas-liquid discharge nozzle 13. Part of the reciprocating flow is disturbed again and the bubbles inside are further refined.

The material of the baffle plate 115 can be any material. For example, it may be plastic or a metal such as aluminum, iron, or stainless steel.

The thickness and weight of the baffle plate 115 can be adjusted to any thickness and weight depending on the required discharge amount of gas and liquid GL, the size of fine bubbles, and the like. Generally, if the weight of the baffle plate 115 is reduced by reducing the thickness or using a light material, the reciprocating motion of the baffle plate 115 becomes faster, so that the bubbles contained in the gas-liquid GL are made finer. And the ability to mix can be increased. For example, in one specific embodiment, the thickness of the baffle plate 115 is about 5 mm and the weight is about 5 mm under the condition that the discharge amount of the gas / liquid GL from the gas / liquid discharge nozzle 13 is about 300 L / min. Although it is set to 400 g, the present invention is not limited to this.

The fine bubble generating device 1000 of the first embodiment is installed on land, and the bubble micronizing section (turbulent flow generating section) 100b located between the gas / liquid generating section 100a and the gas / liquid discharging section 100c is provided. The space between the air-liquid generation unit 100a and the air-liquid discharge unit 100c is sealed by a peripheral wall 14 (see FIG. 4) so as to be accommodated in the sealed space. The peripheral wall 14 forms a gap S through which air and liquid flow between the lumen C of the bubble miniaturization portion 100b and the baffle plate 115. However, when the fine bubble generator 1000 is used in water, the gas liquid discharge unit 100c and the peripheral wall 14 are unnecessary, and the fine bubble generator 1000 uses a gas discharge nozzle (instead of the gas liquid discharge unit 100c and the peripheral wall 14). It may have a support frame such as a rod or an arm that supports the baffle plate regulator) 12. In this case, the region through which the gas and liquid flow, which corresponds to the gap S between the lumen C of the bubble miniaturization portion 100b and the baffle plate 11, is around the baffle plate 115 so as to surround the region outside the outer edge of the baffle plate 115. It will be formed by the liquid pre-existing in the lumen and the baffle plate 11.

Next, the structure of each part of the fine bubble generator 1000 of the first embodiment will be described more specifically with reference to FIGS. 4 to 6.

FIG. 6 is a diagram for explaining the parts constituting the fine bubble generator 1000 shown in FIG. 4, and is a vertical cross-sectional view showing the fine bubble generator shown in FIG. 4 (b) disassembled into a plurality of parts. be.

[Gas and liquid generation unit 100a]
The gas / liquid generation unit 100a includes a swirling flow generating unit 110 that generates a swirling flow of the liquid L by swirling the liquid (water) L introduced from the water distribution 2b via the liquid introduction joint 10a, and the generated liquid. It has a swirling flow development unit 120 that increases the swirling speed of the swirling flow of L, and a swirling flow accelerating unit 130 that accelerates the swirling speed of the swirling flow of the liquid L.

The swirling flow generating unit 110 has a swirling guide blade 110a that applies a swirling force to the liquid L, and a blade support 110b that supports the swirling guide blade 110a. The swirl flow generating portion 110 is arranged on the support flange 101 (see FIG. 4).

The swirling flow development portion 120 includes an outer cylinder 122 through which the liquid L flows, an upstream flange 102 fixed to the upstream end of the outer cylinder 122, and a downstream fixed to the downstream end of the outer cylinder 122. It has a side flange 103 and an inner cylinder 121 housed inside the outer cylinder 122.

Here, an opening 102a as a liquid passage is formed in the center of the upstream flange 102, and an insertion hole 102b for inserting the gantry leg 21 is formed in the peripheral edge of the upstream flange 102. An opening 103a as a liquid passage is also formed in the center of the downstream flange 103, and an insertion hole 103b for inserting the fixed support 22 is formed at the peripheral edge of the downstream flange 103.

The downstream end of the inner cylinder 121 is fixed to the downstream flange 103, and the blade support 110b of the swirling flow generating portion 110 is fixed to the upstream end of the inner cylinder 121. The inner cylinder 121 and the outer cylinder 122 are arranged at a predetermined interval so as to form a flow path between them so that a flow path through which the swirling flow of the liquid L generated by the swirling flow generating portion 110 flows can be formed. On the side wall of the inner cylinder 121, a side wall opening 121a for allowing the liquid L flowing between the inner cylinder 121 and the outer cylinder 122 to flow into the inside of the inner cylinder 121 is formed. A guide member (not shown) such as a fin is attached to the side wall opening 121a so that the swirling direction of the swirling flow of the liquid L flowing into the inside of the inner cylindrical body 121 is reversed.

In the swirling flow developing portion 120 having such a structure, the liquid L flowing between the inner cylindrical body 121 and the outer cylindrical body 122 flows into the inner cylindrical body 121, so that the swirling radius becomes smaller and the swirling speed increases. , The swirling flow is disturbed by reversing the swirling direction. Further, since the gas G is introduced into the inner cylinder 121 from the gas discharge nozzle 12, the increase in the swirling speed of the liquid L and the disturbance of the swirling flow in the inner cylinder 121 cause the liquid L and the gas G to be disturbed. It will promote mixing.

The upstream flange 102 is fixed to the male screw portion of the upper end portion of the gantry leg portion 21 together with the support flange 101 by a pair of nuts 21a and 21b.

The swirl flow acceleration unit 130 is a portion that accelerates the velocity of the gas / liquid GL from the swirl flow development unit 120, and is composed of a portion of the gas / liquid discharge nozzle 13 including a truncated cone-shaped space 13a. There is. In the swirling flow accelerating unit 130, the swirling flow of the gas and liquid GL from the swirling flow developing unit 120 heads toward the gas and liquid discharge port 13b while gradually reducing the swirling radius in the truncated cone-shaped space 13a. The gas / liquid discharge nozzle 13 is held by the component holding flange 104, and the component holding flange 104 is attached to the downstream flange 103 by the fixed strut 22 and the nut 22b screwed into the male screw portion at the lower end of the fixed strut. It is fixed. The downstream flange 103 and the component holding flange 104 are formed with

insertion holes

103b and 104b for inserting the fixed columns 22, respectively, and the downstream flange 103 is formed with an opening 103a as a passage for gas and liquid GL. The component holding flange 104 is formed with an opening 104a for accommodating the gas / liquid discharge nozzle 13.

The constituent materials of parts such as the gas / liquid discharge nozzle 13, the

cylindrical bodies

121, 122, the flanges 101 to 104, and the fixed support column 22 constituting the gas / liquid generation unit 100a are not limited, and the constituent materials are not limited to iron, stainless steel, and the like. It may be a metal or a resin such as acrylic or vinyl chloride.

[Bubble miniaturization unit 100b]
The bubble miniaturization unit 100b is provided so as to be movable toward and away from the discharge port 13b of the gas / liquid discharge nozzle 13 and the discharge amount of the swirling flow of the gas / liquid GL from the discharge port 13b. The plate 115, the baffle plate support 12 that supports the baffle plate 115 so that the baffle plate 115 does not move beyond a certain range, and the discharge port 13b of the baffle plate 115 and the gas / liquid discharge nozzle 13 are arranged in a sealed area. As such, it has a cylindrical member 14 provided between the component holding flange 104 and the component mounting flange 105. The cylindrical member 14 is a peripheral wall forming a closed space (inner cavity C of the bubble miniaturization portion 100b) in which the baffle plate 115 is arranged between the gas / liquid generation portion 100a and the gas / liquid discharge portion 100c. ..

In the bubble miniaturization portion 100b, the tip end portion (shaft portion 12a of the baffle plate support 12) of the gas discharge nozzle 12 is inserted into the first through hole (center through hole 11a) 115a of the baffle plate 115. The baffle plate 115 is not displaced from the position above the discharge port 13b of the gas / liquid discharge nozzle 13, that is, the center of the baffle plate 115 is not separated from the central axis A (see FIG. 1) of the gas discharge nozzle 12 by a predetermined distance or more. As such, the movement of the baffle plate 115 is restricted.

Here, the cylindrical member (peripheral wall) 14 has a nut that is screwed into the fixing column 22 and the threaded portion at the tip thereof so that one end thereof is in close contact with the component holding flange 104 and the other end is in close contact with the component mounting flange 105. It is fixed between these two flanges by 22a.

In the bubble miniaturization unit 100b, the swirling flow of the gas-liquid GL discharged from the gas-liquid discharge nozzle 13 of the gas-liquid generation unit 100a is disturbed by the reciprocating motion of the baffle plate 115, so that the bubbles contained in the gas-liquid GL are fine. Will be made. Further, it is discharged from the gas / liquid discharge port 13b at the tip of the air / liquid discharge nozzle 13 and exceeds the peripheral edge of the baffle plate 115 (that is, flows through the gap S between the lumen C of the bubble miniaturization portion 100b and the baffle plate 115). A part of the swirling flow of the gas-liquid GL toward the gas-liquid discharge portion 100c returns to the gas-liquid discharge port 13b side again through the second through hole (through hole 11b around the center) 115b of the baffle plate 115. It will be disturbed by the baffle plate 115. As a result, in the bubble miniaturization section 100b, the bubbles contained in the gas-liquid GL generated by the gas-liquid generation section 100a are effectively miniaturized.

The constituent materials of parts such as the baffle plate 115, the gas discharge nozzle 12, the cylindrical member 14, and the flange 105 constituting the bubble micronizing portion 100b are not limited, and may be a metal such as iron or stainless steel. , Acrylic, vinyl chloride and other resins may be used.

[Air / liquid discharge unit 100c]
The gas / liquid discharge unit 100c is attached with a gas / liquid discharge head 150 for discharging the gas / liquid GL containing the fine bubbles refined by the bubble micronization unit 100b to the outside of the fine bubble generator 1000, and a gas / liquid discharge head 150. It has a component mounting flange 105.

The component mounting flange 105 is formed with an insertion hole 105b for inserting the fixed support column 22, and the component mounting flange 105 is attached to the fixed column 22 fixed to the component fixing flange 103 by a nut 22a.

Further, a screw hole 105a is formed in the central portion of the component mounting flange 105, a male screw portion 150a is formed at one end of the gas / liquid discharge head 150, and the gas / liquid discharge head 150 is a gas / liquid discharge head. The male screw portion 150a at one end of the 150 is fixed to the component mounting flange 105 by screwing into the screw hole 105a at the center of the component mounting flange 105.

The gas-liquid discharge head 150 is made of a cylinder made of metal such as iron or stainless steel or resin such as acrylic or vinyl chloride. A gas-liquid discharge path 101c is formed inside the cylinder along the axial direction of the cylinder, and the gas-liquid GL discharged from the gas-liquid discharge nozzle 13 of the gas-liquid generation unit 100a is the gas-liquid discharge head 150. It is designed to be discharged to the outside through the gas / liquid discharge path 101c. Further, a gas introduction port 102c is formed on the outer peripheral surface of the columnar body constituting the gas-liquid discharge head 150, and a gas discharge nozzle 12 for discharging gas G is attached to the end surface of the columnar body on the baffle plate 115 side. The opening (tip opening) 12a at the tip of the gas discharge nozzle 12 is connected to the gas introduction port 102c via the gas introduction path 103c, as shown in FIG. 5 (b).

In the gas / liquid discharge head 150 having such a structure, the gas G pumped to the gas introduction port 102c by a pump or the like is sent to the tip opening 102a of the gas discharge nozzle 12 via the gas introduction path 103c of the gas / liquid discharge head 150 (FIG. (Refer to 5 (b)), the gas is discharged from the swirling flow accelerating section 130 of the gas-liquid generating section 100a and introduced into the region straddling the swirling flow developing section 120, and is mixed into the swirling flow of the liquid L.

Next, the operation of the fine bubble generator 1000 of the first embodiment will be described.

FIG. 7 is a vertical cross-sectional view for explaining the operation of the fine bubble generator 1000 shown in FIG. 4, and shows the flow of gas-liquid GL in the vicinity of the baffle plate 115 in the bubble miniaturization section 100b.

In the fine bubble generator 1000 of the first embodiment, as shown in FIG. 2A, when the liquid (tap water) L pumped from the water pipe 2b is supplied to the swirling flow generation unit 110 of the gas / liquid generation unit 100a, the liquid is liquid. A swirling force is applied to L by the swirling guide blade 110a to generate a swirling flow of the liquid L, and the swirling flow of the liquid L is introduced into the swirling flow development unit 120.

In the swirling flow developing portion 120, as shown in FIG. 4B, the liquid L flowing between the inner cylindrical body 121 and the outer cylindrical body 122 flows into the inner cylindrical body 121, so that the swirling radius becomes smaller and swirls. As the speed increases, the swirling direction is reversed and the swirling flow is disturbed.

In this state, in the gas / liquid discharge head 150, the gas G introduced from the gas introduction port 102c reaches the gas discharge nozzle 12 through the gas introduction path 103c, and the gas / liquid discharge nozzle 13 is reached from the tip opening 12a of the gas discharge nozzle 12. Is discharged toward the discharge port 13a. As a result, the gas G is introduced into the region extending from the swirling flow acceleration unit 130 of the gas-liquid generation unit 100a to the region straddling the swirling flow development unit 120, and in the gas-liquid generation unit 100a, the gas G is mixed with the swirling liquid L and swirls. Gas-liquid GL is produced.

Then, in the swirling flow accelerating unit 130, as shown in FIG. 7, the swirling flow of the gas / liquid GL reaches the gas / liquid discharge port 13b while gradually reducing the swirling radius in the truncated cone-shaped space 13a of the gas / liquid discharge nozzle 13. Therefore, the swirling flow of the gas-liquid GL is discharged from the gas-liquid discharge port 13b toward the baffle plate 115.

The baffle plate 115 repeats a reciprocating motion of approaching and moving away from the gas / liquid discharge port 13b according to the discharge amount of the swirling flow of the gas / liquid GL. As a result, the peak of the discharge amount of the swirling flow of the gas-liquid GL discharged from the gas-liquid discharge port 13b is repeated, and the gas-liquid GL is agitated by the reciprocating motion of the baffle plate 115. Bubbles contained in the gas-liquid GL are made finer.

Further, at this time, the gas / liquid discharge portion is discharged from the gas / liquid discharge port 13b and exceeds the peripheral edge of the baffle plate 115 (that is, flows through the gap S between the lumen C of the bubble miniaturization portion 100b and the baffle plate 115). A part of the swirling flow of the gas-liquid GL toward 100c, GL2, passes through the through hole 11b around the center of the baffle plate 115 and returns to the gas-liquid discharge nozzle 13 side. As a result, a part of the swirling flow of the gas-liquid GL, GL2, is disturbed again by the reciprocating motion of the baffle plate 11 that moves toward and away from the gas-liquid discharge nozzle 13, and the bubbles inside are further refined. The other part of the swirling flow of the gas-liquid GL, which is discharged from the gas-liquid discharge port 13b and goes over the peripheral edge of the baffle plate 115 toward the gas-liquid discharge unit 100c, is connected to the gas-liquid discharge path 101c of the gas-liquid discharge head 150. come in.

The gas-liquid GL containing the bubbles refined by the bubble micronizing unit 100b in this way is discharged to the outside of the fine bubble generator 1000 through the gas-liquid discharge path 101c of the gas-liquid discharge head 150.

As described above, in the first embodiment, in the apparatus 1000 that generates fine bubbles, the gas-liquid generation unit 100a and the gas-liquid generation unit 100a that mix the gas G with the liquid L to generate a swirling flow of the gas-liquid GL. Since the gas / liquid discharge unit 13 for discharging the generated air / liquid and the baffle plate 115 facing the gas / liquid discharge unit 13 via a gap are provided, the gas / liquid GL discharged from the gas / liquid discharge unit 13 is provided. The baffle plate 115 moves closer to or separates from the gas / liquid discharge portion 13 depending on the discharge amount of the swirling flow of the gas / liquid GL, and the peak of the discharge amount of the swirling flow of the gas / liquid GL is repeated. As a result, the discharge amount of the gas and liquid containing the fine bubbles can be increased, and as a result, the efficiency of generating the fine bubbles can be improved.

Further, since the baffle plate 115 has a structure having eight through holes 115b formed around the center, the baffle plate 115 is discharged from the gas / liquid discharge port 13b and exceeds the peripheral edge of the baffle plate 115 (that is, the bubble miniaturization portion). A part of the swirling flow of the gas-liquid GL toward the gas-liquid discharge portion 100c (flowing through the gap S between the lumen C of the 100b and the baffle plate 115) is discharged through the through hole 11b around the center of the baffle plate 115. It will return to the nozzle 13 side. As a result, a part of the swirling flow of the gas and liquid discharged from the gas and liquid discharge unit 13 is disturbed again by the baffle plate 115, and the bubbles inside are further refined. As a result, the efficiency of generating fine bubbles can be further improved.

Hereinafter, the size of fine bubbles, the number of fine bubbles per unit volume, and the amount of gas and liquid discharged per unit time are determined by a device having a through hole around the center of the baffle plate of the embodiment of the present invention. The case and the case where the gas and liquid are generated by a device having no through hole around the center in the baffle plate of the conventional comparative example will be described in comparison.
(Example 1)
A device for generating fine bubbles of the present invention equipped with a baffle plate having an outer circumference of φ20 mm, a through hole size of about 3 mm around the center, and eight through holes around the center, and a water supply with a pressure of about 0.5 MPa. By supplying water, gas and liquid containing fine bubbles were generated. As a result, a large amount of gas and liquid containing very fine bubbles was generated, and the entire gas and liquid became cloudy. Further, the generation rate of large bubbles having a diameter of 100 μm or more with respect to the supply amount of the same gas was smaller than that of Comparative Example 1.
(Comparative Example 1)
By supplying tap water having a pressure of about 0.5 MPa to a device that generates fine bubbles having the same configuration as that of the first embodiment except that the baffle plate does not have a through hole around the center, the fine bubbles are contained. Gas and liquid were generated. As a result, although some fine bubbles were generated, the gas and liquid were not turbid and were transparent.

From this result, by using the device for generating the fine bubbles of Example 1 provided with the baffle plate having the through hole around the center, the fine bubbles of the comparative example provided with the baffle plate having no through hole around the center can be obtained. It was confirmed that a large amount of fine bubbles can be efficiently generated as compared with the device that generates them.

As described above, the present invention has been exemplified using the preferred embodiment of the present invention, but the present invention should not be construed as being limited to this embodiment. It is understood that the invention should be construed only by the claims. It will be understood by those skilled in the art that from the description of a specific preferred embodiment of the present invention, an equivalent range can be implemented based on the description of the present invention and common general technical knowledge. It is understood that the references cited herein should be incorporated by reference in their content as they are specifically described herein.

The present invention is useful in the field of a device for generating fine bubbles as a device capable of obtaining a fine bubble generating device capable of improving the efficiency of generating fine bubbles.

10, 100, 200, 1000

Fine bubble generator

11, 115

Baffle plate

11a, 115a First through hole (center through hole)
11b, 115b Second through hole (through hole around the center)
12 Gas discharge nozzle (baffle plate support)
12a Tip opening 13 Gas / liquid discharge part (gas / liquid discharge nozzle)
13a Gas / liquid discharge port 14 Peripheral wall (cylindrical member)
100a Gas-liquid generation part 100b Bubble miniaturization part (turbulent flow generation part)
100c Gas-liquid discharge part G Gas GL Gas-liquid L Liquid S Space (region)

Claims

A device that generates fine bubbles
A gas-liquid generator that mixes gas with liquid to generate a swirling flow of gas and liquid,
A gas / liquid discharge unit that discharges the air / liquid generated in the gas / liquid generation unit,
It is provided with a bubble miniaturization section for refining the bubbles of the gas solution discharged from the gas / liquid discharge section.
The bubble miniaturization portion includes a baffle plate arranged so as to face the gas / liquid discharge portion via a gap, and a baffle plate support having a shaft portion that supports the baffle plate. A gap is formed between the lumen of the baffle plate and the baffle plate.
The baffle plate has a central through hole located at the center and one or more through holes located outside the center, and the shaft portion of the baffle support is inserted into the central through hole. Bubble generator.
The fine bubble generator according to claim 1, wherein the baffle plate can move in the axial direction of the baffle plate support by a flow rate discharged from the gas / liquid discharge unit.
The fine bubble generator according to claim 1 or 2, wherein the baffle plate is a substantially disk, and the one or more through holes are a plurality of through holes arranged around the center of the substantially disk.
The fine bubble generator according to claim 3, wherein the center of the one or more through holes is located on the center side of the center between the center of the substantially disk and the outer peripheral edge.
The fine bubble generator according to any one of claims 1 to 4, wherein the shape of the one or more through holes is substantially circular.