JP2017136513A - Fine bubble generator, fine bubble generation method, shower device and oil / water separator having the fine bubble generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine bubble generator excellent in handleability, operability and durability by utilizing the generation of a swirling flow by pressurized liquid injection and simplifying the structure and structure, and fine bubbles capable of generating a large amount of bubbles. Provided are a generation method, and a shower device and an oil-water separation device having the fine bubble generator. SOLUTION: The fine bubble generator 1 of the present invention has an inner cylinder 5 having a gas-liquid swirling chamber 9 inside, an outer cylinder container 3 having a double cylindrical structure into which the inner cylinder 5 is inserted, and an outer cylinder container. 3 has a liquid supply cylinder 2 provided with a liquid introduction port 6 for introducing a liquid, and the inner cylinder 5 has an end portion 7 closed on the side of the liquid supply cylinder 2 and an end portion 8 opened on the opposite side. The inner cylinder 5 is provided with a through slit 10 or a through hole formed between one end on the liquid supply cylinder 2 side and the middle of the inner cylinder 5 in the longitudinal direction, and the through slit 10 or the through hole is formed. A gap 11 is provided between the outer wall of the outer cylinder and the inner wall of the outer cylinder container 3, and is integrated with the outer cylinder container 3. [Selection diagram] Fig. 2

Description

  The present invention relates to microbubbles used for showers used in bathrooms, washrooms, etc., transportation and farming of aquatic organisms, purification of tap water, river water, ponds, lakes, dams, etc., resuscitation of the water environment, oil separation, etc. The present invention relates to a generator, a method for generating fine bubbles, and a shower device and an oil / water separator having the fine bubble generator.

  In showers used in baths and bathrooms, when hot water or water is discharged, the head and body are washed by making a gentle flow from the shower head with a small hole. It is known that cleaning with foam can improve the cleaning effect more than that without foam, and if you can create and wash foam in the shower, the cleaning efficiency will increase, and the skin massage effect and blood circulation will improve We can expect effect. In order to generate bubbles, not only hot water but also air must be taken in. It is known that bubbles are generated by a method such as a venturi, and showers having a venturi nozzle by a method of entering from the side of a pipe are sold. A method of generating bubbles using a swirl flow by swirl holes is also applied to showers.

  Also, as a method of transporting and farming aquatic organisms, purifying water quality such as tap water, river water, ponds, lakes, dams, and dams, and reviving the water environment, air flotation using a fine bubble generator has been well known. Yes. As this fine bubble generating device, various methods different from those applied in the shower have been proposed. For example, Patent Documents 1 to 3 disclose a method using a gas-liquid swirl flow.

  The swirling fine bubble generator disclosed in Patent Document 1 includes a container having a conical or bottle-shaped space, and a liquid inlet opening in a tangential direction on a part of the inner wall circumferential surface of the space. And a gas introduction hole opened at the bottom of the space and a swirling gas-liquid outlet opening established at the top of the space. In this fine bubble generator, a pressurized flow is pumped into the conical or bottle-shaped space from the liquid inlet, thereby generating a swirling flow and forming a negative pressure portion on the conical tube axis. Fine bubbles are obtained based on the mechanism.

  Patent Document 2 discloses a fine bubble generating device including a container having a space in which a swirl flow can be generated, a pressurized liquid inlet, a gas inlet, a liquid inlet, and a gas-liquid mixture outlet. The pressurized liquid introduction port is provided on the side surface of the container 1 so as to guide the pressurized liquid that generates a swirling flow into the space into the container.

  Further, in Patent Document 3, in order to suppress the occurrence of severe cavitation erosion in the gas-liquid swirl chamber, a preliminary swirl unit that rectifies the gas-liquid swirled by the liquid introduced from the liquid outlet, and the spare A swirling fine bubble generating device is disclosed that includes a liquid swirled by a swirling unit and a main swirling unit that brings a gas introduced from a gas inlet into contact therewith.

  On the other hand, application of the fine bubble generator to an oil / water separator by a floating separation method is also being studied. For example, Patent Documents 4 to 6 propose various configurations and structures. In these oil-water separators according to the prior art, unlike the swirl type fine bubble generating device, a bubble generating device that refines bubbles from an air blower with an impeller or a propeller blade (Patent Document 4), A bubble generating device (Patent Document 5) that makes dissolved air under reduced pressure in a large bubble remover (Patent Document 5) and a pressurizing / depressurizing fine bubble generator (Patent Document 6) are used.

JP 2000-447 A JP 2007-111616 A JP 2006-142300 A JP-A-3-229696 JP 2005-125167 A JP 2014-151318 A

  As a microbubble generator applied to applications such as showers used in bathrooms and washrooms, transport and storage of aquatic organisms, water purification and resuscitation of water environment and oil / water separation, it is possible to make bubbles finer. Therefore, it is required that a large amount of fine bubbles can be generated efficiently and that the generation of fine bubbles can be maintained even during long-time operation. Furthermore, a simple and compact configuration and structure are strongly desired from the viewpoints of operability, durability, maintainability, and manufacturing cost reduction.

  When mixing liquid and gas, the venturi system that forms a hole in the side of the tube and puts the gas may cause water to enter the gas inlet when the shower is held by hand, preventing the inflow of gas. is there. Therefore, the venturi-type shower has a problem that operability and handleability are inferior.

  In addition, the swirling microbubble generators described in Patent Documents 1 and 2 can generate microbubbles with a simple mechanism of generating swirling flow by pressurized liquid, but the pressurized liquid is tangential to the container. Or the method of pumping from the inlet provided in a side surface is employ | adopted, and in order to generate a lot of fine bubbles, it is necessary to raise the pressure of the liquid introduced under pressure. However, when the pressure of the liquid to be introduced under pressure is increased, cavitation erosion occurs, causing a problem that the apparatus is worn and broken in a short period of time. This problem is also pointed out in Patent Document 3. Furthermore, the fine bubble generating device described in Patent Document 1 or 2 needs to separately provide a gas suction port and a swirling gas / liquid outlet, or a gas suction port, a liquid suction port, and a gas / liquid mixture outlet. Therefore, the structure and structure are somewhat complicated, and a simpler and more versatile apparatus is required from the viewpoint of installation and handling of the apparatus.

  The fine bubble generating device described in Patent Document 3 has been proposed to suppress cavitation erosion, but not only includes a gas-liquid swirl chamber composed of a preliminary swirl unit and a main swirl unit, but also includes the gas-liquid swirl. Since the gas supply cylinder for introducing gas into the swirl chamber is disposed at the center of the wall surface of the lower end portion of the liquid supply cylinder, the configuration and structure are complicated. In particular, the liquid supply cylinder has a structure that penetrates the inside of the gas supply cylinder, and the manufacturing process is complicated considering the alignment and fixing of each cylinder and the sealing property of the liquid supply cylinder. It must be manufactured with considerable care in terms of durability.

  On the other hand, the oil-water separators described in Patent Documents 4 to 6 are exceptional in the generation of a large amount of fine bubbles and the improvement of durability, such as an impeller, a large bubble remover, and a pressure / decompression type fine bubble generator. It is necessary to provide parts and devices, and the configuration is somewhat complicated, so that it is not satisfactory in terms of handling and operability. Therefore, there is a strong demand for an oil-water separator having a highly versatile microbubble generator that can be handled more easily and has excellent operability and durability.

  The present invention has been made in view of the above-described conventional problems, and generates fine bubbles by a simple mechanism of generating a swirling flow by injection of pressurized liquid, and more than the conventional apparatus. By adopting a simple configuration and structure, a compact fine bubble generating apparatus excellent in handling, operability and durability, a fine bubble generating method capable of generating a large amount of fine bubbles, and the swivel fine having such characteristics An object of the present invention is to provide a shower and an oil / water separator that are excellent in operability and durability by using a bubble generator and have high versatility.

  Unlike the swirl type fine bubble generator described in Patent Document 3, the present invention includes an inner cylinder having a gas-liquid swirl chamber inside and an outer cylinder in which the inner cylinder is inserted to form a double cylinder structure. And a through-slit or through-hole formed so that a gas-liquid swirl flow can be generated by injecting pressurized liquid from the outside to the inside of the inner cylinder, and a gas in the inner cylinder. The present invention finds out that the above-mentioned problems can be solved by adopting an inner cylindrical structure including an introduction port for introduction and an opening end functioning as a gas-liquid projection port from which gas-liquid projects from the gas-liquid swirl chamber. Invented.

That is, the configuration of the present invention is as follows.
[1] The present invention forms a double-cylindrical structure by inserting a cylindrical or conical inner cylinder having a gas-liquid swirl chamber, which is a space in which gas-liquid can be swirled, into the inside, and the inner cylinder. A cylindrical or conical outer cylinder container, and a liquid supply cylinder provided with a liquid inlet for introducing liquid into the outer cylinder container,
The inner cylinder is
An end closed on the liquid supply cylinder side;
An end opening on the opposite side of the liquid supply cylinder so as to function as a gas introduction port for introducing gas into the gas-liquid swirl chamber and a gas-liquid discharge port from which gas-liquid protrudes from the gas-liquid swirl chamber When,
A through slit or a through hole formed between one end of the liquid supply cylinder side to the middle of the longitudinal direction of the inner cylinder, and
It is integrated with the outer cylinder container in the form of providing a gap for introducing the liquid between the inner cylinder outer wall of the part where the through slit or the through hole is formed and the inner wall of the outer cylinder container,
Fine bubbles utilizing a gas-liquid swirl flow generated by injecting and introducing the liquid supplied from the liquid introduction port of the liquid supply cylinder into the gas-liquid swirl chamber inside the inner cylinder through the through slit or through hole. A fine bubble generator characterized by generating
[2] In the present invention, in the through slit or the through hole, the inner wall circular radius of the inner cylinder section is r, and the position of the inner wall portion of the inner cylinder section where the ejected liquid collides is defined as the liquid ejecting direction. When the position when projected onto the perpendicular drawn with respect to the tangent of the inner wall circle in parallel relation is P, the position of P is r on the perpendicular from the inner wall of the inner cylinder cross section toward the center. The fine bubble generating device according to [1] is provided, which has an opening passage in which an injection direction is adjusted so as to be included in a distance range of / 2.
[3] In the present invention, a plurality of the through-holes are arranged in the longitudinal direction of the inner cylinder, and both ends of the through-holes are arranged in the length of the through-slit or in the longitudinal direction of the inner cylinder. L is greater than W, where L is the distance between the centers of the through holes and W is the width of the through slit or the diameter or length of the through hole in the direction perpendicular to the longitudinal direction of the inner cylinder. The microbubble generator described in [1] or [2] is provided.
[4] In the above [1] to [3], the width of the through slit or the diameter or length of the through hole is 1/5 or less of the inner diameter of the inner cylinder. A fine bubble generating apparatus according to any one of the above is provided.
[5] The present invention according to any one of [1] to [4], wherein the present invention includes a plurality of the through slits or through holes at equal intervals in a circumferential direction of the inner cylinder cross section. A microbubble generator is provided.
[6] According to the present invention, in the inner cylinder, the closed end on the liquid supply cylinder side includes an opened cylindrical end and a lid that closes the opening of the cylindrical end, and the lid is used. The open cylindrical end portion is closed by any one of pressure welding molding, caulking molding, adhesion, and bonding, according to any one of the above [1] to [5]. A fine bubble generating apparatus is provided.
[7] In the inner cylinder, the present invention provides a plurality of small recesses on the circumferential surface of the inner wall of the inner cylinder with the longitudinal direction of the inner wall of the inner cylinder facing the liquid supply cylinder from the gas-liquid projecting port. A small vortex branch wall for changing a large swirl formed in the gas-liquid swirl chamber into a small swirl by being provided halfway is formed on the gas-liquid discharge port side. A fine bubble generator according to any one of 1] to [6] is provided.
[8] The present invention includes a cylindrical tube for introducing a gas into the inner cylinder having the gas-liquid swirl chamber, and uses one end of the cylindrical tube as the gas inlet. The fine bubble generator according to any one of [1] to [7] is provided.
[9] The present invention uses the microbubble generator according to any one of [1] to [7],
Supplying pressurized liquid from the liquid introduction port of the liquid supply cylinder, and injecting and introducing into the gas-liquid swirl chamber inside the cylinder through the through slit or through hole provided in the inner cylinder;
The gas sucked from the gas inlet using the negative pressure generated at the center of the swirling flow of the liquid formed by the centrifugal force generated when the jet is introduced is the liquid jet of the through slit or the through hole. And mixing with the liquid ejected from the liquid ejection port in the vicinity thereof,
And a step of projecting a gas-liquid swirl flow obtained by mixing the liquid and the gas from the gas-liquid projecting port through an inner wall surface of the inner cylinder.
[10] The present invention is a method for generating fine bubbles in a state in which the fine bubble generating device according to [8] is immersed in a liquid, and the pressurized liquid is supplied from a liquid inlet of the liquid supply cylinder. Supplying and injecting into the gas-liquid swirl chamber inside the cylinder through the through slit or through hole provided in the inner cylinder;
Introducing the gas from the outside into the gas-liquid swirl chamber inside the inner cylinder through the cylindrical tube;
The gas introduced from the cylindrical tube using the negative pressure generated at the center of the swirling flow of the liquid formed by the centrifugal force generated when the jet is introduced is supplied to the liquid injection port of the through slit or the through hole. And mixing with the liquid in the vicinity thereof;
And a step of projecting a gas-liquid swirl flow obtained by mixing the liquid and the gas from the gas-liquid projecting opening through an inner wall surface of the inner cylinder.
[11] The present invention is a method for generating fine bubbles in a state where the fine bubble generating device according to [8] is immersed in a liquid,
Supplying pressurized liquid from the liquid introduction port of the liquid supply cylinder, and injecting and introducing into the gas-liquid swirl chamber inside the cylinder through the through slit or through hole provided in the inner cylinder;
Introducing the warm air having a higher temperature than the liquid before the microbubble generator is immersed or the cool air having a lower temperature from the outside into the gas-liquid swirl chamber inside the inner cylinder through the cylindrical tube;
The warm air or cold air introduced from the cylindrical tube using the negative pressure generated at the center of the swirling flow of the liquid formed by the centrifugal force generated when the jet is introduced is passed through the through slit or the through hole. Mixing with the liquid at and near the liquid jet;
Projecting the gas-liquid swirl flow obtained by mixing the liquid and the gas through the inner wall surface of the inner cylinder from the gas-liquid projecting port;
Provided is a method for generating fine bubbles, characterized in that the temperature in a liquid in which the fine bubble generator is immersed is adjusted by the warm air or the cold air.
[12] The present invention includes the fine bubble generating device according to any one of [1] to [7] as a shower nozzle, and an opening located on a side opposite to the liquid inlet in the liquid supply cylinder. Provided is a shower device characterized in that water or hot water is supplied from a section, and the water or hot water is sprayed and used from a gas-liquid projecting port of the fine bubble generator in a state in which fine bubbles are contained.
[13] The present invention provides the fine bubble generator according to [8], an oil / water mixture separation tank having the fine bubble generator at the bottom and used to inject the oil / water mixture, and the oil / water An oil-water separator having a pump for supplying or circulating a part of the oil-water mixture injected into the mixed-liquid separator into the liquid supply cylinder provided in the fine bubble generator.
[14] The present invention is characterized in that the oil / water separator according to the above [13] has means for individually recovering the oil phase separated using the oil / water separator from the oil / water mixture separation tank. An oil-water separator is provided.

  The microbubble generator of the present invention generates microbubbles by a simple mechanism of generating a swirl flow by jetting pressurized liquid, so that the microbubbles can be miniaturized and efficiently generate a large number of microbubbles. In addition, the generation of fine bubbles can be maintained even during long-time operation. In addition, since it has a simpler configuration and structure than the conventional swirling flow fine bubble generating device, it is excellent in handling, operability and durability, and a compact device can be constructed. Furthermore, on the circumferential surface of the inner wall of the inner cylinder provided in the fine bubble generating device, a plurality of small recesses are provided from the gas-liquid projecting port toward the liquid supply cylinder to the middle in the longitudinal direction of the inner wall of the inner cylinder, By forming a small vortex branch wall for changing a large swirl vortex formed in the gas-liquid swirl chamber into a small swirl vortex, a large amount of fine bubbles can be generated on the gas-liquid discharge port side.

  Unlike the Venturi system and the like, the fine bubble generating device of the present invention has a simple structure that does not have a gas injection tube or the like on the side surface of the outer cylinder container, and thus is excellent in operability and handling. Furthermore, by using the microbubble generator of the present invention, it is possible to establish a method for generating microbubbles that can efficiently generate a large amount of stable microbubbles over a long period of time. Therefore, when the microbubble generator of the present invention is applied to a shower device, not only high cleaning efficiency but also an effect of improving the skin massage effect and blood circulation can be obtained. In addition, when applied to the transportation and farming of organisms and water purification, tap water, river water, ponds, lakes, dams, etc. for water quality purification and resuscitation of the water environment, it greatly contributes to the maintenance and growth of organisms and environmental conservation. To do.

  On the other hand, when the swirl flow microbubble generator of the present invention is applied as a component of an oil / water separator, the structure and structure are simple, so that an oil / water separator having excellent operability and durability and high versatility is obtained. be able to. In addition, since efficient oil-water separation performance is maintained over a long period of time, it is possible to reduce costs for manufacturing, installation, and maintenance as compared with conventional oil-water separation devices.

It is the top view and front view which show an example of the microbubble generator of this invention. It is a figure which shows the cross section of the AA position of the microbubble generator shown in FIG. 1, and the flow and mixing state of a liquid and gas. It is sectional drawing of the BB position of the microbubble generator shown in FIG. It is a figure which shows typically the flow of the fluid which has the cross section of CC position of the fine bubble generator shown in FIG. 1, and rotational force. It is a perspective view which shows typically a state when a liquid and gas enter in the microbubble generator of this invention. It is a figure which shows typically the generation | occurrence | production state of the flow of the liquid and vortex which occur with the microbubble generator of this invention. In the microbubble generator of this invention, it is a figure which shows the example of the inner cylinder which provided the through slit in the position different from a tangential direction. In the microbubble generator of this invention, it is sectional drawing which shows another example of the inner cylinder which provided the through slit simultaneously in the position different from a tangential direction and a tangential direction. It is a figure which shows the modification of the inner cylinder which provided the through-hole in the microbubble generator of this invention. It is the top view and front view which show the microbubble generator of this invention used when putting it in water and making it operate | move. It is sectional drawing when operating the bubble generator shown in FIG. 10 in water. It is sectional drawing which shows the modification of the fine mechanism generator which has a gas flow rate adjustment valve in the fine mechanism generator shown in FIG. It is a figure which shows another modification of the fine bubble generator shown in FIG.10 and FIG.11. It is sectional drawing which shows the oil-water separator which has the microbubble generator of this invention. It is sectional drawing which shows the modification of the oil-water separator of this invention.

  Hereinafter, a preferred embodiment of a fine bubble generator according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments.

<First Embodiment>
FIG. 1 is a front view and a top view showing an example of the fine bubble generating apparatus of the present invention. In FIG. 1, reference numeral 1 denotes a main body of the fine bubble generator. The fine bubble generating device 1 is composed of a liquid supply cylinder 2 and an outer cylinder container 3, and by supplying a liquid from one end opening of the liquid supply cylinder 2, a gas-liquid swirl flow is generated inside the fine bubble generation device 1. Is generated, and the gas-liquid protrudes from the gas-liquid protruding port 4 opened at the tip of the outer cylindrical container 3. The internal structure of the microbubble generator 1 shown in FIG. 1 will be described in detail with reference to cross-sectional views at positions of a cross-section AA, a cross-section BB, and a cross-section CC. Further, with reference to these cross-sectional views, the gas-liquid swirl flow generation mechanism according to the present invention and the effects produced thereby will be described together.

  FIG. 2 is a view showing a cross-section at the position AA of the fine bubble generating device 1 shown in FIG. As shown in FIG. 2, the microbubble generator 1 includes a cylindrical inner cylinder 5 as an internal structure, and a cylindrical outer cylinder container 3 that forms a double cylindrical structure by inserting the inner cylinder 5 therein. And a liquid supply cylinder 2 provided with a liquid inlet 6 for introducing liquid into the outer cylinder container 3. The inner cylinder 5 has an end portion 7 which is closed on the liquid supply cylinder 2 side and an end portion 8 which is opened on the opposite side to the liquid supply cylinder 2 side. It has a gas-liquid swirl chamber 9 which is a space. Further, the inner cylinder 5 is formed with a through slit 10 (or a through hole) between one end on the liquid supply cylinder 2 side and the middle of the inner cylinder 5 in the longitudinal direction. The number of through slits 10 (or through holes) is one or more, and the shape and position thereof will be described in detail later with reference to FIG. Further, the inner cylinder 5 has an outer cylinder container in which a gap 11 for introducing a pressurized liquid is provided between the outer wall of the portion where the through slit 10 (or the through hole) is formed and the inner wall of the outer cylinder container 3. 3 is integrated.

  The pressurized liquid 2 a supplied from the one end opening of the liquid supply cylinder 2 is introduced into the outer cylinder container 3 from the liquid inlet 6 of the liquid supply cylinder 2. This pressurized liquid enters the gap 11 provided between the outer wall of the inner cylinder 5 and the inner wall of the outer cylinder container 3 as shown by the liquid flow 2b, and passes through the slit 10 ( Or it may be a through-hole) and is injected so as to rotate to the inner circumference of the inner cylinder 5. The gap 11 is formed so that the pressurized liquid introduced from the liquid inlet 6 is uniformly ejected from the inner periphery of the inner cylinder 5 through the through slit 10 (or through hole), at least in the inner cylinder 5. It is necessary to provide up to the portion where the through hole) is formed.

  The pressurized liquid thus ejected starts to rotate while being pressed against the inner wall surface by centrifugal force in the gas-liquid swirl chamber 9 inside the cylinder 5. Since the liquid that has started to rotate has a lower pressure at the center of the swirl vortex, the air 12 present at the end of the open end 8 of the inner cylinder 5 in the atmospheric pressure state is sucked. At this time, since the gas 12 is light, the gas 12 is sucked toward the center of the gas-liquid swirl chamber 9 and moves toward the end 7 closed on the liquid supply cylinder 2 side as indicated by 12a. Is mixed with the pressurized liquid and mixed in the pressurized liquid as bubbles while swirling together in the gas-liquid swirl chamber 9 in an apparently clouded state. Then, the gas-liquid swirl flow generated in the gas-liquid swirl chamber 9 gradually proceeds to the open end 8 of the inner cylinder 5, and the liquid containing fine bubbles is discharged from the circular outer periphery of the end 8. Be injected. Thus, the open end 8 of the inner cylinder 5 functions as a gas introduction port 13 for introducing gas into the gas-liquid swirl chamber 9 and a gas-liquid discharge port 4 from which the gas-liquid projects from the gas-liquid swirl chamber 9. Thus, different functions can be exhibited at different locations in one opening, that is, in the central portion (portion that functions as the gas inlet 13) and the peripheral portion (portion that functions as the gas-liquid discharge port 4).

  FIG. 3 is a cross-sectional view of the fine bubble generating device 1 shown in FIG. 1 taken along the line B-B, as viewed from the open end 8. As shown in FIG. 3, a semicircular recess 14 is provided on the circumferential surface of the inner wall of the open end 8 in the longitudinal direction of the inner cylinder 5 from the gas-liquid projecting port 4 toward the liquid supply cylinder 2. A plurality are formed. By this semicircular recess 14, the liquid mixed with air that has come out along the outer wall of the gas-liquid swirl chamber 9 by centrifugal force is decomposed at that portion, and the rotating vortex is converted into a small vortex and discharged. can do. A plurality of semicircular recesses 14 are provided on the circumferential surface of the inner wall of the end 8 so as to function as a small vortex branch wall 15.

  In this way, the liquid is rotated by being pressed against the inner wall surface of the inner cylinder 5 of the fine bubble generating device 1 by centrifugal force, so that the surface of the shower nozzle that is in contact with the liquid is more roughened, thereby further mixing the liquid and the gas. Become smooth. Thereby, not only the bubbles can be made finer, but also a large amount of fine bubbles can be generated. In the present embodiment, in addition to the small vortex branch wall 15, for example, a streak (convex) between the inner wall circumferential surface of the inner cylinder 3 and the semicircular recess 14 constituting the small vortex branch wall 15 in the vertical direction. , Recesses), protrusions against the rotation direction, and twisted protrusions or depressions opposite to the direction of water rotation, the generated bubbles can be made into finer particle bubbles.

  The small vortex branch wall 15 formed of the semicircular recess 14 shown in FIG. 3 is effective in generating a larger amount of fine bubbles. However, the microbubble generator of the present invention has the small vortex branch wall 15 as shown in FIG. Even if it does not have, the effect of the present invention of generating fine bubbles can be achieved. Therefore, when cost reduction is first considered when manufacturing a microbubble generator, a simple structure is adopted in which the periphery of the inner wall of the opening has a smooth surface at the end 8 that functions as the gas-liquid discharge port 4. May be.

  FIG. 4 is a diagram schematically showing a cross-section at the CC position of the microbubble generator 1 shown in FIG. 1 and a flow of fluid having a rotational force. As shown in FIG. 4, in the microbubble generator 1 of the present embodiment, the through slits 10 are formed at four locations in the tangential direction of the inner cylinder 5 and are arranged at equal intervals in the circumferential direction of the inner cylinder 5. ing. The pressurized liquid sprayed to the inner wall of the inner cylinder 5 through the through slit rotates as a vortex as shown in 16 so that the pressure at the center of the vortex 16 is lowered and the pressure is lower than the atmospheric pressure. It is done. And the gas-liquid mixed liquid is created by mixing with the gas sucked from the gas inlet 13 at the open end 8 of the inner cylinder 5. The state is shown in FIGS. FIG. 5 is a perspective view schematically showing a state when liquid and gas enter in the fine bubble generating apparatus of the present invention. Moreover, FIG. 6 is a figure which shows typically the generation | occurrence | production state of the liquid flow and vortex which occur in the microbubble generator of this invention.

  As shown in FIG. 5, since the pressurized liquid rotates and forms a vortex, the atmosphere 12 is sucked toward the center of rotation. In mixing gas and liquid, since the liquid is heavier than the gas, it is pressed against the wall surface of the gas-liquid swirl chamber 9 existing inside the inner cylinder 5 by centrifugal force, while the gas is lighter, so the gas-liquid swirl chamber 9 Is sucked toward the bottom of the gas-liquid swirl chamber 9, that is, toward the end 7 closed on the liquid supply cylinder 2 side in the inner cylinder 5 as in 2a, and then mixed with the liquid. Conditions for sufficiently mixing gas and liquid in a mixed state with such gas and liquid can be obtained by optimizing the shape and structure of the inner cylinder and the through slit.

  As can be seen from the flow of liquid and the state of generation of vortices shown in FIG. 6, the pressurized liquid 2a is vigorously supplied and is divided into 2b, and after the vortex rotation shown by 2c is performed, the small vortex branch wall 15 shown in FIG. Changes to a 2d vortex and branches to a small vortex. Here, since the center of the vortex indicated by 2c has a negative pressure, the gas is sucked into the negative pressure portion at the center of the vortex, whereby the gas is mixed with the liquid and bubbles are generated.

  As described above, in the method for generating fine bubbles using the fine bubble generating apparatus 1 according to the present embodiment, the pressurized liquid 2 a is supplied from the liquid inlet 6 of the liquid supply cylinder 5 and provided in the inner cylinder 5. The step of injecting and introducing into the gas-liquid swirl chamber 9 inside the cylinder 5 through the through slit 10 (or the through hole) and the negative generated at the center of the swirling flow of liquid formed by the centrifugal force generated when the injection is introduced. Mixing the gas 12 sucked from the gas inlet 13 using pressure with the liquid ejected from the liquid ejecting port of the through slit 10 (or the through hole) and in the vicinity thereof, and the liquid A step of projecting a gas-liquid swirl flow obtained by mixing with the gas 12 a from the gas-liquid projecting four ports through the inner wall surface of the inner cylinder 5 is basically included.

  Next, the shape (length and width) of the through slit 10 provided in the inner cylinder 5 of the microbubble generator 1 according to the present embodiment will be described.

  The through slit 10 is preferably such that L is greater than W, where L is the length in the longitudinal direction of the inner cylinder 5 and W is the width in the direction perpendicular to the longitudinal direction. More preferably. A through slit formed in a rectangular shape having a long side in the longitudinal direction of the inner cylinder 5 (or a through hole formed in an elliptical shape having a long axis) is effective for generating a high-speed gas-liquid swirl flow. . On the other hand, the length of the depth is determined by the thickness of the inner cylinder 3.

  Further, the width (W) of the through slit 10 shown in FIGS. 2 and 4 needs to be 1/5 or less of the inner diameter of the inner cylinder 5, and is preferably in a range of 1/8 to 1/20. . By defining the width (W) of the through slit 10 in the direction of narrowing to 1/5 or less, the speed of the liquid when ejected from the through slit 10 is greatly increased, compared with the pressurized liquid introduced from the liquid inlet 6. The liquid pressure can be further increased. In the prior art, in order to generate a large amount of fine bubbles, it was necessary to increase the pressure of the liquid when introduced under pressure. However, the fine bubble generator according to this embodiment increases the pressure of the liquid to be introduced under pressure so much. Even if not, the pressure of the liquid can be increased by the through slit 10, so that a gas-liquid swirl flow sufficient to generate a large amount of fine bubbles can be generated. Thereby, the effect that generation | occurrence | production of the said cavitation erosion which was a problem by the prior art can be suppressed is acquired. Furthermore, if the width (W) of the through slit 10 is set to 1/8 or less, a higher-speed gas-liquid swirl flow can be generated, and the effect of generating a large amount of fine bubbles is enhanced. However, conversely, if the width (W) of the through slit 10 is too narrow, the amount of liquid that can be injected into the gas-liquid swirl chamber 9 tends to decrease, and the ability to generate a gas-liquid swirl flow tends to decrease. It is practical to set the width of 10 to 1/20 or more.

  The speed of the liquid ejected from the through slit 10 is influenced not only by the absolute value of the width of the through slit 10 but also by the internal volume of the inner cylinder 5 due to the pressure difference. Therefore, the width of the through slit 10 provided for obtaining the effect of the present invention is preferably defined by the ratio to the inner diameter of the inner cylinder 5.

  Further, as shown in FIG. 4, it is preferable to have a plurality of through slits 10 at equal intervals in the circumferential direction of the cross section of the inner cylinder 5. In that case, it is possible to generate a large vortex of a gas-liquid swirl flow at a higher speed than a device having only one through slit. Further, by providing a plurality of through slits 10 at equal intervals in the circumferential direction of the cross section of the inner cylinder 5, it is possible to suppress a decrease in the speed of the gas-liquid swirl flow that is likely to occur due to turbulent flow, which is effective for generating a large amount of fine bubbles. . As described above, in the present embodiment, it is preferable to provide a plurality of through slits 10 in the circumferential direction of the cross section of the inner cylinder 5, but the effect of the present invention can be achieved even when formed in only one place.

  When the through slit 10 is provided in the tangential direction of the inner cylinder 5 as in the present embodiment, there are the following two forming methods. One is a method of forming a through slit on the closed end side using an inner cylinder that has been molded in advance so as to have one end closed and the other open end. . The other is to form a through slit in the tangential direction of the inner wall circumference of one of the ends using a cylinder having ends open at both ends, and then cover the end opening on the side where the through slit is formed It is a method of integrating the two by closing with. Here, as a method of attaching the lid, any one of pressure welding molding, caulking molding, adhesion, and joining can be employed. In addition, as the inner cylinder or cylinder used in both of the forming methods, a small vortex branch wall 15 composed of a semicircular recess 14 is formed on the inner peripheral surface of the end opposite to the end forming the through slit. May be used.

  Of the two formation methods, in the present embodiment, the latter method is preferable because the formation of the through slit 10 is easy and the width and length of the through slit 10 can be formed with high accuracy. That is, the closed end portion located on the liquid supply cylinder 2 side is composed of an open cylindrical end portion and a lid that closes the opening portion of the cylindrical end portion. The inner cylinder 5 is used that is closed by any one of fastening, bonding, and joining methods. As will be described later, when the through slit 10 is not provided in the tangential direction of the inner cylinder 5, there is almost no difference between superiority and inferiority in the two forming methods, and the manufacturing process is simplified and the cost is reduced. Either method can be employed depending on the situation.

  Next, the shape of the outer cylinder container 3 which forms the double cylinder structure by inserting the inner cylinder 5 and the inner cylinder 5 provided in the fine bubble generator of the present embodiment into the inside will be described. The inner cylinder 5 and the outer cylinder container 3 shown in FIGS. 1 and 2 are both cylindrical, but in the present embodiment, they are not necessarily limited to a cylindrical shape, and may be a conical shape. . For example, the shape in which the cross-sectional inner diameter gradually increases from the liquid inlet 6 toward the open end 8 of the cylinder that also serves as the gas inlet 13 and the liquid protrusion 4 (a cone having the bottom of the open end 8 side). Shape) or a gradually narrowing shape (conical shape with the liquid inlet 6 side being the bottom surface) can be employed. In the former case, the amount of gas introduced from the gas inlet 13 is increased. In the latter case, the speed of the gas-liquid swirl flow gradually increases toward the liquid protrusion 4. Is obtained. However, when the conical shape is used, as the angle of inclination of the ridge line with respect to the bottom surface becomes smaller, the liquid discharge port 4 becomes too wide in the former, so that the speed of the gas-liquid swirl flow rapidly decreases toward the liquid projection port 4. In the latter case, the gas introduction port 13 becomes too narrow, and problems such as a reduction in the amount of gas introduced may become prominent. Therefore, it is preferable that the inclination angle of the conical ridge line with respect to the bottom surface is set in a range of 60 degrees or more and less than 90 degrees and is close to a cylindrical shape.

  As described above, unlike the venturi system, the fine bubble generating device according to the present embodiment does not need to form a gas injection tube or the like on the side surface of the outer cylinder container. Further, unlike the fine bubble generating device described in Patent Document 3, it is not necessary to provide a preliminary swirl portion, and a gas supply cylinder for introducing gas into the gas-liquid swirl chamber is used as a lower end wall surface of the liquid supply cylinder. It is not necessary to arrange in the center. As described above, the microbubble generator of the present invention has a great feature in that the configuration and structure of the inner cylinder 5 is different from the conventional microbubble generator, which is excellent in handling and operability of the apparatus, and reliable. High durability and durability can be improved.

  The microbubble generator 1 according to the present embodiment can be applied to, for example, a shower apparatus because it has a simple apparatus configuration and can generate a rotating vortex of a small liquid containing bubbles. Specifically, the fine bubble generating device 1 is used as a shower nozzle, and water or hot water is supplied from one end opening located on the opposite side to the liquid inlet 6 in the liquid supply cylinder 2, and the water or hot water is finely divided. This is a shower device that injects a desired portion (for example, skin) of the human body from the gas-liquid projection port 4 of the fine bubble generating device 1 in a state where bubbles are included. When hot water is used as the pressurized liquid, the gas-liquid mixed with the liquid and air hits the skin as it is sprayed, so the stimulation by the bursting of bubbles, the power to massage the rotating hot water, and the water pressure of the shower are added. Can promote blood circulation. Thereby, the effect of an efficient washing | cleaning and a massage can be acquired. Moreover, since this shower apparatus comes out with the water discharged from the exit of a shower nozzle as a polka dot, it can produce the cleaning effect of the new sense which is not in the past.

<Second Embodiment>
In the first embodiment, the example of the fine bubble generating device in which the through slit 10 is provided in the tangential direction of the inner cylinder 3 has been described. However, in the present invention, the position where the through slit is provided is limited to the tangential direction of the inner cylinder. Not. FIG. 7 shows an example of an inner cylinder in which a through slit is provided at a position different from the tangential direction in the fine generator of the present invention. 7, (a), (b), (c), and (d) are respectively a plan view and a front view of the inner cylinder 17, a cross-sectional view at the DD position shown in (a), and (b). It is sectional drawing of an EE position.

  As shown in FIG. 7, the inner cylinder 17 according to the present embodiment is different only in the formation position of the through slit 18, and the semicircular concave portion 19 corresponds to the opening portion of the opened end portion 21 (corresponding to a gas-liquid protruding port) A plurality of portions are formed from the portion to the end 22 of the inner cylinder 17 which is closed in the longitudinal direction of the inner wall. As described in the first embodiment, the semicircular recess 19 functions as a small vortex branch wall 20 that converts a rotating vortex into a small vortex and discharges it.

  As shown in FIGS. 7B and 7D, the inner cylinder 17 of this embodiment has through slits 18 provided at two locations near the closed end portion 22. The inner cylinder 17 according to the present embodiment is characterized by the position where the through slit 18 is formed. That is, as shown in FIG. 7D, the through slit 18 has the inner wall circular radius of the cross section of the inner cylinder 17 as r, and the position of the inner wall portion of the inner cylinder 17 where the jetted liquid collides with the position of the liquid. When the position projected onto the perpendicular N drawn with respect to the tangent line M of the inner wall circle parallel to the injection direction (the portion indicated by →) is P, the position of P is above the perpendicular N Thus, it is preferable that the inner cylinder 17 is formed so as to have an opening passage in which the injection direction is adjusted so as to be included in a distance range of r / 2 or less from the inner wall of the cross section toward the center. Thereby, the vortex 23 by the gas-liquid swirl flow can be generated in the gas-liquid swirl chamber inside the inner cylinder 17. If the position P shown in FIG. 7 exceeds r / 2, the liquid ejected from the through slit 18 is reflected or scattered after colliding with the inner wall surface of the inner cylinder 17 to generate a gas-liquid swirl flow. Or the flow of the gas-liquid swirl flow is greatly disturbed, making it difficult to generate the vortex 23.

  Actually, the internal cylinder 17 provided with two through slits 18 at a distance of r / 4 from the inner wall of the cross section toward the center is incorporated into the fine bubble generator shown in FIG. Examined. Further, as a comparative example, using another inner cylinder provided with two through slits at a distance of 3r / 4, and similarly incorporating the microbubble generator shown in FIG. It was. As a result of comparing both of the bubble generation conditions, in the case of the former of the present embodiment, a large amount of fine bubbles was confirmed, whereas in the latter comparative example, the generation of bubbles was small, and there was a large difference between the two. I found out.

  The position of P defined in the present embodiment can be defined in the same range even when the through slit 10 is provided in the tangential direction as in the inner cylinder 3 used in the first embodiment. That is, in the first embodiment, the position of P defined in the present embodiment is a position where the position of the inner cylinder 5 is 0 (zero) from the inner wall of the cross section of the inner cylinder 5 toward the center, and a distance of r / 2 or less. It is included in the range. Therefore, as a modification of the inner cylinder used in the present embodiment, as shown in the cross-sectional view of FIG. 8, an inner cylinder in which through slits are simultaneously provided at positions different from the tangential direction and the tangential direction may be used. In the inner cylinder 24 shown in FIG. 8, two through slits 25 and 26 are formed in the inner wall tangential direction and in a direction different from the tangential direction, respectively. Therefore, when the inner cylinder 24 shown in FIG. 8 is incorporated in the fine bubble generator shown in FIG. 1 and the bubble generation state is observed, it is qualitative, but finer than the case where the inner cylinder 18 shown in FIG. 7 is used. A large amount of bubbles was observed.

  In the present embodiment, the through slits 18, 25 and 26 provided in the cylinders 17 and 24 shown in FIGS. 7 and 8 are within the range defined in the first embodiment with respect to the length (L) and the width (W). It can be defined in the same way. This is because only the formation positions of the through slits are different, and there is no significant difference in the shape of the through slits. That is, in the length (L) and width (W) of the through slit shown in FIG. 7B, L is larger than W, and W is 1/5 or less of the inner diameter of the inner cylinder 17 or 24. More preferably, it is in the range of 1/8 to 1/20.

<Third Embodiment>
FIG. 9 is a view showing another modified example of the inner cylinder in which a through hole is provided instead of the through slit in the fine generator of the present invention. 9A and 9B are a front view and a cross-sectional view taken along the line F-F shown in FIG. The inner cylinder 27 shown in FIG. 9 is a small vortex branch wall composed of a plurality of semicircular recesses on the circumferential surface of the inner wall of the open end portion 28 of the inner cylinder 27, like the inner cylinder 5 shown in FIG. Have

  As shown in FIG. 9A, the inner cylinder 27 of the present embodiment has a plurality of through holes 30 arranged in a straight line at two locations near the closed end portion 29. The inner cylinder 27 of the present embodiment differs from the through slit 18 provided in the inner cylinder 17 shown in FIG. 7 only in that a plurality of through holes 30 are formed. 7 is almost the same as the case of the inner cylinder 17 shown in FIG. 7 (see FIG. 9B). In the plurality of through holes 30 arranged in the longitudinal direction of the inner cylinder 27, the distance between the centers of the through holes at both ends is L, and the diameter or length of the through hole 30 perpendicular to the longitudinal direction of the inner cylinder 27 is When W is W, L is provided in a shape larger than W. Thereby, the same function as the case of the through-hole slit described in the first embodiment is exhibited, and a vortex 31 of a gas-liquid swirl flow sufficient to generate a large amount of fine bubbles can be formed. In order to sufficiently obtain this effect, it is preferable that the relationship of L ≧ 2 × W is further satisfied, and the number of through holes 30 is also adjusted and determined so as to satisfy the relationship.

  FIG. 9 shows an example in which a plurality of through holes 30 are provided in the inner cylinder 27. However, when the through hole 30 has an elliptical shape, the long axis (the axis corresponding to the L) is the short axis ( It is also possible to have an inner cylinder structure that is longer than the axis corresponding to W and has a structure in which one is provided by setting L to be twice or more than W. Here, the through hole 30 having a rectangular shape and a large ratio of L to W can be regarded as a through slit.

  By incorporating the inner cylinder according to the present embodiment and the second embodiment into the fine bubble generating device, it can be applied as a nozzle of the shower device in the same manner as the fine bubble generating device according to the first embodiment. Therefore, an efficient cleaning and massage effect can be obtained from the shower apparatus.

<Fourth Embodiment>
The fine bubble generator having the first fine bubble generator and the second and third inner cylinders can be used mainly as a shower nozzle. It can also be used for transporting and farming organisms, purifying water, and reviving water environments. That is, it is possible to put a large amount of gas bubbles such as air generated by the bubble generator into dirty water such as a water tank or a lake.

  FIG. 10 is a plan view and a front view showing the fine bubble generating device of the present invention when operated by putting it in water. In FIG. 10, 32 is a main body of the fine bubble generating device, which is composed of a liquid supply cylinder 33 and an outer cylinder container 34, and is opened at the tip of the outer cylinder container 34 so as to suck in the gas of the outside air. It has a cylindrical tube 35 inserted from the end. FIG. 11 shows a cross-sectional view at the GG position in a state where the fine bubble generating device 32 shown in FIG. 10 is actually put in water.

  As shown in FIG. 11, the cylindrical tube 35 uses a fine generating device having the same configuration and structure as shown in FIG. 1, passes through the gas-liquid swirl chamber 38 from the end 37 opened in the inner cylinder 36, and The bottom of the liquid swirl chamber tube 38, that is, the closed end portion 39 is inserted, and the liquid swirl chamber tube 38 is set in a state of being slightly lifted from the end portion 39. The cylindrical tube 35 exits from the water to the atmosphere, and is provided for sucking the atmospheric gas 40 and blowing the gas 40 into the liquid swirl chamber 38 located inside the inner cylinder 36. It has the same function as a straw tube. Here, in the vicinity of the closed end portion 39 of the content 34, as described in the first to third embodiments, the through slit 42 (or the injection liquid 42 is injected in order to inject the pressurized liquid 41 into the inner cylinder 34. A through-hole) is provided.

  The operation when the fine bubble generating device shown in FIG. 11 is used as a nozzle will be described.

  As shown in FIG. 11, after the fine bubble generating device 32 is submerged in the water as a bubble generating nozzle, water with adjusted water amount and water pressure is introduced from the outside, thereby introducing the through slit 42 (or penetrating into the inner cylinder 34). The rotational force of the liquid ejected through the hole) is adjusted. A liquid swirl flow is generated by the rotational force of the liquid, and the gas 40 sucked from the cylindrical tube 35 is forcibly supplied to the center of the swirl flow to generate a gas-liquid swirl flow containing gas. By causing the swirling gas-liquid swirling flow to be projected from the open end 37 of the inner cylinder 36, the bubbles 43 can be generated in water. Further, the depth of sinking when the main body of the fine bubble generating device 32 is submerged may be reduced, and the cylindrical tube 35 may be inserted into the main body of the fine bubble generating device 32 later. Even in that case, the gas 40 can be sucked from the cylindrical tube 35 by the negative pressure created by the vortex rotation, so that bubbles can be generated in the water.

  Further, the liquid 41 is pushed vigorously from the opening of the liquid supply cylinder 33 by using a pump or the like, and a vortex as described above is created, and the gas 40 is sucked in from the tip opening of the cylindrical tube 35 at a negative pressure, Alternatively, if the gas 40 is pushed in with pressure in advance, bubbles can be created even if the nozzle is set at a deep water depth. Underwater such as an aquarium or a lake can be agitated by the action of relatively large bubbles using this. This function can be realized by, for example, the configuration of the fine mechanism generator shown in FIG.

  FIG. 12 is a cross-sectional view showing a modification of the fine bubble generator having a gas flow rate adjusting valve in the fine mechanism generator shown in FIG. The fine bubble generating device 44 shown in FIG. 12 uses a gas flow rate adjustment valve 45 when putting a device having the same configuration and structure as the fine bubble generating device 32 shown in FIG. The height can be adjusted. The gas flow rate adjusting valve 45 is provided at the entrance of the cylindrical tube 35 or in the middle thereof. Since the fine mechanism generator 44 can adjust the pressure of the gas 40 by the gas flow rate adjusting valve 45, as described above, even when submerged in deeper water, the action of the large bubbles causes the gas-liquid swirl flow to flow. Generation of vortices due to generation can be promoted, and a large amount of fine bubbles 43 can be generated.

  The fine bubble generating device 32 shown in FIGS. 10 and 11 inserts the cylindrical tube 35 to the closed end portion 39 of the inner cylinder 36, and is set in a state where it floats slightly from the end portion 39. Embodiments are not limited to this structure. For example, what connects a cylindrical pipe | tube to the edge part which the inner cylinder opened is contained. An example is shown in FIG. FIG. 13 is a view showing another modification of the fine bubble generating device shown in FIGS. 10 and 11, wherein (a), (b), (c) and (d) are a plan view, a perspective view, It is sectional drawing of the HH position shown to a front view and (a).

  In the microbubble generator 46 shown in FIG. 13, a cylindrical tube 50 is connected or joined to a closed end portion 49 of an inner tube 48 inserted into an outer tube 47, and the closed end portion 49 of the closed tube 49 is connected to the cylindrical tube 50. A gas introduction through hole 51 is formed in the vicinity. The gas introduction through hole 51 is provided to introduce the gas 52 sucked from the cylindrical tube 50 into the gas-liquid swirl chamber 53 inside the inner cylinder 48. It is preferable to provide two or more gas introduction through holes 51 at equal intervals in the circumferential direction. Further, the inner cylinder 48 is provided with a through hole 54 instead of the through slit shown in FIG.

  As shown in FIG. 13, the pressurized liquid 55 is supplied from the liquid supply cylinder 56, introduced into the outer cylinder 47 from the liquid introduction port 57, and then the gas-liquid swirl chamber 53 through the through hole 54 provided in the inner cylinder 48. To spray. In the gas-liquid swirl chamber 53, the center of the inner cylinder 48 becomes a negative pressure by swirling the injected liquid, so that the gas 52 sucked from the cylindrical tube 50 passes through the gas-introducing through hole 51. Enter 53. A liquid containing small bubbles is formed by mixing the liquid ejected in the gas-liquid swirl chamber 53 and the sucked gas, and is discharged from the gas-liquid projecting port 57. Since the small vortex branch wall 58 formed of a plurality of semicircular recesses is formed on the inner wall circumferential surface of the open end that forms the gas-liquid projecting port 57, the cylinder 48 is formed from the gas-liquid projecting port 57. The discharged gas-liquid contains fine bubbles. As described above, the fine bubble generating apparatus shown in FIG. 13 is basically the same as the apparatus shown in FIGS. 10 and 11 except for the structure of the cylindrical tube, and generates a large amount of fine bubbles. be able to.

  As described above, the method for generating the fine bubbles in the state of being immersed in the liquid using the fine bubble generating apparatus according to the present embodiment is, for example, that the pressurized liquid is applied to the liquid supply cylinder 33 in FIGS. A step of injecting and introducing the gas 40 into the gas-liquid swirl chamber 38 inside the cylinder 36 through a through slit 42 (or a through hole) provided in the inner cylinder 36 from the liquid introduction port, and the gas 40 from the outside through the cylindrical tube 35 36 is introduced from the cylindrical tube 35 by utilizing the negative pressure generated at the center of the swirling flow of liquid formed by the step of introducing into the gas-liquid swirling chamber 38 inside the liquid jet 36 and the centrifugal force generated when the jet is introduced. The gas 40 to be mixed is mixed with the liquid 41 at the liquid injection port of the through slit 42 (or the through hole) and the vicinity thereof, and the gas-liquid swirl flow obtained by mixing the liquid 41 and the gas 40 is changed into the inner cylinder 36. A step projecting from open end 37 functions as a gas-liquid spout through the inner wall, the city basically

  Moreover, the fine bubble generator by this embodiment can adjust the temperature in the liquid which immersed the fine bubble generator by the following method. Specifically, in FIG. 11, a pressurized liquid is supplied from a liquid inlet of the liquid supply cylinder, and a gas-liquid swirl chamber inside the cylinder 36 through a through slit 42 (or a through hole) provided in the inner cylinder 36. The step of injecting into the gas flow through the cylinder 38 and the gas / liquid swirl chamber 38 inside the inner cylinder 36 from the outside through the cylindrical tube 35 from the outside with warm air having a higher temperature or cooler temperature than the liquid before the microbubble generator 32 is immersed therein. And introducing the warm air or cold air introduced from the cylindrical tube 35 using a negative pressure generated at the center of the swirling flow of the liquid formed by the centrifugal force generated when the jet is introduced. The step of mixing with the liquid 41 at and near the liquid injection port of the slit 42 (or the through-hole) and the gas-liquid swirl flow obtained by mixing the liquid 41 and the gas 40 project the gas-liquid through the inner wall surface of the inner cylinder 36. Mouth Step projecting from open end 37 to function, a fine bubble generating method having essentially the city.

  According to this method, for example, by introducing warm air from an air conditioner or hot air from a heater from a cylindrical tube, warm gas is sent into the liquid in which the microbubble generator of the present invention is immersed. The temperature of the entire liquid can be raised without using a heater for heating. Moreover, when temperature rises too much, it can respond easily only by stopping the operation | movement of a microbubble generator. Conversely, when it is desired to lower the temperature of the liquid, by introducing cool air from an air conditioner or outside air, the temperature of the entire liquid can be lowered without cooling the entire room. In this method, when the temperature of a large amount of water or liquid stored in a large-capacity container, such as aquaculture water or food liquid, is adjusted appropriately, bubbles are easily generated from the inside of the liquid. Since the temperature can be adjusted, an unprecedented energy saving effect can be obtained.

<Fifth Embodiment>
FIG. 14 is a cross-sectional view showing an oil-water separator having the fine bubble generator of the present invention. An oil / water separator 59 shown in FIG. 14 has a fine bubble generator 60 having the same configuration and structure as the fourth embodiment and a fine bubble generator 60 at the bottom, and injects and separates an oil / water mixture. And a pump 63 for supplying or circulating a part of the oil / water mixed liquid injected into the oil / water mixed liquid separating tank 61 to the liquid supply cylinder 62 provided in the fine bubble generating device 60. Basically have. In the pipes between the oil / water mixture separation tank 61 and the pump 63 and between the pump 63 and the liquid supply cylinder 62, adjustment valves 64 for adjusting the amount of liquid are provided as 64a and 64b, respectively.

  In addition, the oil separation device 59 of the present embodiment may include a water storage tank 65 for storing pure water not containing oil, separately from the oil / water mixture. Pure water is supplied from the water storage tank 65 to the liquid supply cylinder 62, and pure water is introduced from the bottom of the oil / water mixture separation tank 61 together with the bubbles generated by the fine bubble generator 60, thereby circulating only the oil / water mixture. Oil-water separation can be accelerated than the method. This is because the introduction of pure water increases the ratio of water in the oil / water mixture present at the bottom and bottom of the oil / water mixture separation tank 61 and promotes separation between the oil phase and the water phase. Even when the water storage tank 65 is provided, a pump 66 and a regulating valve 67 for supplying pure water are provided as 67a and 67b between the water storage tank 65 and the liquid supply cylinder 62, respectively.

  The operation principle of the oil / water separator shown in FIG. 14 will be described. The mechanism by which air bubbles promote the separation of dispersoids (oil colloidal particles) in the medium (water) is the contact of the oil colloidal particles or impurity particles dispersed in the water while the air bubbles are rising in the water to adsorb them. The main effect is to increase buoyancy. In this case, if the particle diameter of the bubbles is large, the rising speed of the bubbles is excessive, so that the oil colloid particles or impurity particles are not sufficiently adsorbed, and separation does not easily proceed. Therefore, it is necessary to generate fine bubbles having a small particle size in the oil / water mixture.

  The fine bubble generating device 60 used in the oil / water separation device 59 of the present embodiment has an effect that a large amount of fine bubbles can be generated, and thus is very effective for efficiently performing oil / water separation. Furthermore, the fine bubble generating device 60 operates by a simple mechanism in which the generation of bubbles uses the formation of vortices due to the generation of swirling flow. In addition, the introduction of gas from outside air is performed only by attaching the cylindrical tube 68. Therefore, it is not necessary to use a high-pressure air pump for sending a gas necessary for generating bubbles. If the gas is sent out by a high-pressure air pump, the high-pressure air pump must always be operated to prevent backflow even when the apparatus is stopped, and handling and maintenance are poor.

  Thus, since the oil-water separator 59 of this embodiment has a simple structure, it is excellent in handling property and operability, and can improve durability. In addition, even if a situation occurs in which the device is replaced due to a malfunction or a natural disaster, the replacement work is easy and the maintainability is excellent.

  FIG. 14 shows the oil phase 69 in a state where only the oil phase is separated from the oil / water mixture by moving the oil / water separator 59 and floats on the upper surface of the oil / water mixture. Since the floated oil phase 69 needs to be individually recovered and removed from the oil / water mixture separation tank 61, in the present embodiment, it is preferable to have means for individually recovering the oil phase 69.

  Examples of the means for individually collecting the oil phase 69 include a vacuum car and a vacuum suction device for sucking and collecting the oil phase 69, or an oil adsorbing material that has been used conventionally. As the oil adsorbent, a naturally derived oil adsorbent having a known flaky or granular shape can be used. As other methods, for example, the oil phase 69 may be individually recovered by a method as shown in FIG.

  FIG. 15 is a cross-sectional view showing a modification of the oil / water separator according to the present invention. The oil / water separator 70 shown in FIG. 15 is basically the same in structure and structure as the oil / water separator 59 shown in FIG. 14, but has an outlet 71 for taking out only the oil phase 69 floating above the outside. The difference is that an oil storage tank 72 for recovering the oil phase 69 flowing out from the discharge port 71, a pipe connecting them, and a regulating valve 73 are provided in the middle thereof.

  A method of individually collecting the oil phase 69 will be described with reference to FIGS. (A) and (b) of FIG. 15 is a figure which shows the state before collection | recovery of the oil phase 69 which floated, respectively, respectively in the middle of collection | recovery. First, by continuing the operation of the microbubble generator 60, the oil separated from the oil / water mixture gradually floats above the oil / water mixture separation tank 61, and finally the oil phase 69 is formed at the top. ((A) of FIG. 15). Next, the regulating valve 64 b is closed, and then pure water is supplied from the water storage tank 65 into the liquid supply cylinder 62 located at the bottom of the fine bubble generator 60. Then, not only bubbles are continuously generated by the introduction of pure water, but also the liquid level (position of the liquid level) of the oil / water mixture rises, and the oil phase 69 moves to the position of the discharge port 71, at that time. Then, the discharge of the oil phase 69 is started, and the oil phase 69 flows into the oil storage tank 72 ((b) of FIG. 15). At that time, if the water existing under the oil phase 69 is also discharged, the oil phase 69 can be removed almost completely. Then, after confirming that the oil phase 69 has been completely removed from the uppermost part of the oil / water mixture separation tank 61, the supply of pure water from the water storage tank 65 is stopped, or most of the components are separated by the separation process. A part of the oil / water mixture converted to water is caused to flow backward to the water storage tank 65 by the pump 66 to lower the liquid level. The water returned to the water storage tank 65 by the backflow can be reused as a part of pure water used for the next oil / water separation treatment.

  As described above, the oil / water separator 70 according to this embodiment moves the liquid level of the oil / water mixture to be separated in the oil / water mixture separation tank 61 up and down to separate only the oil phase 69 from the oil / water mixture. It can be easily taken out from the tank 61 to the outside. Therefore, compared to the case of using a vacuum car, a vacuum suction device, an oil adsorbing material, or the like, the oil phase 69 can be easily recovered and the processing cost can be reduced.

  As described above, the microbubble generator of the present invention uses a simple mechanism of generating a swirling flow, and has a simpler configuration and structure than a conventional swirling flow microbubble generating device, and produces a large amount of microbubbles. It can be generated over a long period of time and is excellent in handling, operability and durability. Therefore, when the microbubble generator of the present invention is applied to a shower device, not only high cleaning efficiency but also an effect of improving the skin massage effect and blood circulation can be obtained. In addition, when applied to the transportation and farming of organisms and water purification, tap water, river water, ponds, lakes, dams, etc. for water quality purification and resuscitation of the water environment, it greatly contributes to the maintenance and growth of organisms and environmental conservation. To do. Furthermore, when the swirl flow microbubble generator of the present invention is applied as a component of an oil / water separator, not only the efficient oil / water separation performance is maintained for a long period of time, but also the structure and structure are simple, An oil / water separator having excellent operability and durability and high versatility can be obtained.

1, 32, 44, 46, 60 ... Fine bubble generating device 2, 33, 56, 62 ... Liquid supply cylinder 3, 34, 47 ... Outer cylinder container 4, 57 ... Gas-liquid projection port 5, 17, 24, 27, 36, 48 ... inner cylinder 6, 57 ... liquid introduction port 7, 22, 29, 39, 49 ... closed end 8, 21, 28, 37 ... Open ends 9, 38, 53 ... Gas-liquid swirl chambers 10, 18, 25, 26, 42 ... Through slits 11 ... Gap 12 ... Air 13 ... Gas inlet port 14, 19: Semicircular recess 15, 20, 58 ... Small vortex branch wall 16, 23, 31 ... Vortex 30, 54 ... Through-hole 35, 50, 68 ... Cylindrical tube 40, 52 ... Gas 41, 55 ... Pressurized liquid 43 ... Bubble 45 ... Gas flow control valve 51 ... Gas introduction through Hole 59, 70 ... Oil / water separator 61 ... Oil / water mixture separator 63, 66 ... Pump 64, 67, 73 ... Adjust valve 65 ... Water tank 69 ... Oil phase 71 ..Discharge port 72 ... Oil storage tank

Claims (14)

A cylindrical or conical inner cylinder having a gas-liquid swirl chamber which is a space in which gas and liquid can swirl, and an outer cylindrical or conical shape which forms a double cylindrical structure by inserting the inner cylinder into the inner cylinder A cylinder container, and a liquid supply cylinder having a liquid inlet for introducing liquid into the outer cylinder container,
The inner cylinder is
An end closed on the liquid supply cylinder side;
An end opening on the opposite side of the liquid supply cylinder so as to function as a gas introduction port for introducing gas into the gas-liquid swirl chamber and a gas-liquid discharge port from which gas-liquid protrudes from the gas-liquid swirl chamber When,
A through slit or a through hole formed between one end of the liquid supply cylinder side to the middle of the longitudinal direction of the inner cylinder, and
It is integrated with the outer cylinder container in the form of providing a gap for introducing the liquid between the inner cylinder outer wall of the part where the through slit or the through hole is formed and the inner wall of the outer cylinder container,
Fine bubbles utilizing a gas-liquid swirl flow generated by injecting and introducing the liquid supplied from the liquid introduction port of the liquid supply cylinder into the gas-liquid swirl chamber inside the inner cylinder through the through slit or through hole. A device for generating fine bubbles, characterized in that   The through slit or the through hole has an inner wall circular radius of the inner cylinder cross section as r, and the position of the inner wall portion of the inner cylinder cross section where the injected liquid collides is parallel to the liquid ejecting direction. Assuming that the position when projected onto the perpendicular drawn with respect to the tangent line is P, the position of P is within the distance range of r / 2 or less on the perpendicular from the inner wall to the center of the inner cylinder cross section. The fine bubble generating device according to claim 1, further comprising an opening passage in which an injection direction is adjusted so as to be included.   A plurality of the through holes are arranged in the longitudinal direction of the inner cylinder, and the distance between the centers of the through holes at both ends in the length of the through slit or the plurality of through holes arranged in the longitudinal direction of the inner cylinder is set. L is greater than W, where L is W and the width of the through slit or the diameter or length of the through hole in a direction perpendicular to the longitudinal direction of the inner cylinder is W. 2. The fine bubble generator according to 2.   4. The microbubble generation according to claim 1, wherein a width of the through slit or a diameter or length of the through hole is 1/5 or less of an inner diameter of the inner cylinder. apparatus.   5. The fine bubble generating device according to claim 1, wherein a plurality of the through slits or the through holes are provided at equal intervals in a circumferential direction of the inner cylinder cross section.   In the inner cylinder, the closed end on the liquid supply cylinder side includes an opened cylindrical end and a lid that closes the opening of the cylindrical end, and the opened cylindrical end using the lid The microbubble generator according to any one of claims 1 to 5, characterized in that is closed by any one of pressure welding molding, caulking molding, adhesion, and joining.   The inner cylinder is provided with a plurality of small recesses on the circumferential surface of the inner wall of the cylinder from the gas-liquid projecting port toward the liquid supply cylinder to the middle of the inner wall of the inner cylinder in the longitudinal direction. The small vortex branch wall for changing the large swirl formed in the liquid swirl chamber into a small swirl is formed on the gas-liquid discharge port side. The fine bubble generator described in 1.   A cylindrical tube for introducing gas into the inner cylinder having the gas-liquid swirl chamber is provided, and one end of the cylindrical tube is used as the gas inlet. The fine bubble generating apparatus according to claim 1. Using the microbubble generator according to any one of claims 1 to 7,
Supplying pressurized liquid from the liquid introduction port of the liquid supply cylinder, and injecting and introducing into the gas-liquid swirl chamber inside the cylinder through the through slit or through hole provided in the inner cylinder;
The gas sucked from the gas inlet using the negative pressure generated at the center of the swirling flow of the liquid formed by the centrifugal force generated when the jet is introduced is the liquid jet of the through slit or the through hole. And mixing with the liquid ejected from the liquid ejection port in the vicinity thereof,
Projecting a gas-liquid swirl flow obtained by mixing the liquid and the gas from the gas-liquid projecting port through an inner wall surface of the inner cylinder. A method for generating fine bubbles in a state in which the fine bubble generator according to claim 8 is immersed in a liquid,
Supplying pressurized liquid from the liquid introduction port of the liquid supply cylinder, and injecting and introducing into the gas-liquid swirl chamber inside the cylinder through the through slit or through hole provided in the inner cylinder;
Introducing the gas from the outside into the gas-liquid swirl chamber inside the inner cylinder through the cylindrical tube;
The gas introduced from the cylindrical tube using the negative pressure generated at the center of the swirling flow of the liquid formed by the centrifugal force generated when the jet is introduced is supplied to the liquid injection port of the through slit or the through hole. And mixing with the liquid in the vicinity thereof;
And a step of projecting a gas-liquid swirl flow obtained by mixing the liquid and the gas from the gas-liquid projecting port through an inner wall surface of the inner cylinder. A method for generating fine bubbles in a state in which the fine bubble generator according to claim 8 is immersed in a liquid,
Supplying pressurized liquid from the liquid introduction port of the liquid supply cylinder, and injecting and introducing into the gas-liquid swirl chamber inside the cylinder through the through slit or through hole provided in the inner cylinder;
Introducing the warm air having a higher temperature than the liquid before the microbubble generator is immersed or the cool air having a lower temperature from the outside into the gas-liquid swirl chamber inside the inner cylinder through the cylindrical tube;
The warm air or cold air introduced from the cylindrical tube using the negative pressure generated at the center of the swirling flow of the liquid formed by the centrifugal force generated when the jet is introduced is passed through the through slit or the through hole. Mixing with the liquid at and near the liquid jet;
Projecting the gas-liquid swirl flow obtained by mixing the liquid and the gas through the inner wall surface of the inner cylinder from the gas-liquid projecting port;
A method of generating fine bubbles, characterized in that a temperature in a liquid in which the fine bubble generator is immersed by the warm air or cold air is adjusted.   The fine bubble generator according to any one of claims 1 to 7 is provided as a shower nozzle, and water or hot water is supplied from an opening located on the side opposite to the liquid inlet in the liquid supply cylinder, A shower apparatus characterized by using water or hot water sprayed from a gas-liquid projecting port of the fine bubble generator in a state in which fine bubbles are contained. The fine bubble generating device according to claim 8,
An oil / water mixture separation tank used for injecting an oil / water mixture, having the fine bubble generator at the bottom;
A pump for supplying or circulating a part of the oil / water mixture injected into the oil / water mixture separation tank to the liquid supply cylinder provided in the microbubble generator;
The oil-water separator characterized by having.   The oil / water separator according to claim 13, further comprising means for individually recovering the oil phase separated by using the oil / water separator from the oil / water mixture separation tank.

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