JP2002011335A - Fine bubble supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine bubble supply apparatus hard to get out of order, excellent in durability and certainly generating fine bubbles in a large discharge amount to supply them into a target liquid. SOLUTION: A revolving container 12, which has a peripheral wall part 14 having an air-liquid revolving columnar space S therein and lid parts 16 fixed to both end parts of the peripheral wall part 14 to close the container, is arranged in the target liquid L to which bubbles are supplied. An introducing port 18 for introducing air into the columnar space so as to blow off the same in the tangential direction of the air-liquid revolving circumference of a circle 100 is provided to the peripheral wall part 14 and air-liquid lead-out ports 22 are respectively provided to both lid parts 16. At least a liquid is introduced into the columnar space in the tangential direction under pressure from the introducing port by a liquid supply device 24 to generate a revolving stream to generate fine bubbles 210 and these bubbles 210 are introduced and supplied into the target liquid L from the air-liquid lead-out ports 22 along with the liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine bubble supply apparatus for supplying fine bubbles to a liquid in order to increase the amount of oxygen contained therein for water purification, activation and other purposes.

[0002]

2. Description of the Related Art Conventionally, air has been supplied to a fertilizer solution in hydroponics or fresh water or seawater for cultivation of fish and shellfish to increase the concentration of oxygen contained in these liquids to promote the growth of animals and plants. In addition, a method is known in which aeration is performed on sewage treated water or the like to supply oxygen to the water, thereby promoting biological oxidation and purifying the water quality. Further, it is known that the solid content is separated and removed by blowing air into the water treatment liquid, and it is also effective to improve the water quality by supplying it to the bottom water portion of the dam. Generally, in order to dissolve air that has become bubbles in water, the smaller the bubble diameter is, the larger the surface area of the whole bubbles is, and the gas-liquid contact area is increased to improve the dissolution efficiency in water.

Conventionally, a method of performing aeration in water includes a method using a diffuser tube, a method in which air is injected into water by an ejector, and a stirring and mixing method in which a rotating body with blades is rotated to agitate the water to generate bubbles. A method of generating air bubbles by depressurizing air-dissolved pressurized water,
There is a method using ultrasonic waves and the like. In the diffusion method, pressurized air is pumped from a fine pore by a compressor or the like, but it is difficult to generate fine bubbles of several tens of microns because volume expansion occurs when air is released from the pressurized state. ,
In addition, the clogging of the pores is caused at an early stage, so that maintenance work and cost are high. In addition, the stirring and mixing method does not effectively generate fine bubbles, and
Power cost for rotating blades is required. In addition, the decompression method, the ejector method, and the ultrasonic method of the air dissolving and pressurizing method require large-scale equipment and are expensive, and it is difficult to easily introduce them.

[0004]

On the other hand, Japanese Patent Application Laid-Open No. 2000-2000
In No. 447, as shown in FIG. 13, a water liquid is introduced from the tangential direction of the cylindrical pipe, air is negatively self-primed from the gas self-priming pipe at the upper end which is one end side of the cylindrical pipe, and the cylinder is connected through the communication port. A device has been proposed in which an outlet is provided at the other end of the tube in a direction perpendicular to the axial direction of the cylindrical tube to generate fine bubbles. However, in this device, a liquid is injected from the tangential direction to generate a vortex or a rotating flow to make the center of the cylinder a negative pressure, and a vinyl tube or the like is extended to a pipe serving as a gas self-priming pipe, and the end is exposed to the atmosphere. On the side,
Through this, the outside air is introduced from the gas self-priming tube as a thin columnar shape, and fine bubbles are generated while cutting (shearing) the taken-in outside air so as to twist the outside air. Is made as small as possible to generate fine bubbles. That is, for example, it is necessary to form the gas self-priming tube portion with a diameter of about 1 mm. For this reason, dust is clogged on the outside air intake side of the pipe arranged outside, and salt is fixed in a place close to the seaside and long. There was a problem that the inside of the vinyl tube was clogged at an early stage and lacked practicality. In addition, both ends of the column of the air cavity at the center of the cylindrical body generated by the rotating flow reach both ends of the cylindrical body, that is, the mounting wall of the gas self-priming pipe, and the cavitation causes the periphery of the small-diameter gas self-priming pipe to surround. It was a problem of wear and eventually breaking from breakage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object a very simple structure, low manufacturing costs, low operating costs, and low maintenance costs. Excellent, furthermore, it generates fine bubbles reliably, and also obtains a large discharge amount and supplies fine bubbles in the target liquid where the device is placed, increases the amount of oxygen stored, and effectively creates a water flow An object of the present invention is to provide a fine bubble supply device capable of realizing water purification or the like.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a peripheral wall portion 14 having a columnar space S inside which a gas-liquid swirl is possible, and fixed at both ends of the peripheral wall portion so as to close the interior. And a swirl container 12 which is disposed in the target liquid L to which fine bubbles are supplied, and has a peripheral wall portion 14 which has a columnar shape so as to blow out in a tangential direction of the gas-liquid swirl circumference 100. In addition to having an inlet 18 communicating with the space S and introducing at least the liquid into the columnar space, a gas-liquid outlet 22 is provided on each of the lids 16 at a position on the axial line of the columnar space. A fluid supply device connected to the port for pressurizing and introducing at least the liquid into the columnar space, and generating a swirling flow while pressurizing and introducing at least the liquid into the columnar space by the fluid supply device in a tangential direction; Fine Composed of gas-liquid outlet port 22 formed by derived target liquid L microbubbles 210 with liquid simultaneously from fine bubble supplying device 10 to generate bubbles.

The shape of the columnar space S may be cylindrical.

Further, the total area of the gas-liquid outlet 22 is set larger than the total area of the inlet.

A flow regulating plate 5 having a communication opening 50 in the peripheral wall portion 14 so as to intersect the axial direction of the columnar space S.
2 may be fixed.

The swirl container 12 has a gas inlet (5).
4) is provided, a gas supply tube 56 having a gas intake opening disposed on the ground side is connected to the suction port, and the target liquid L is supplied from the introduction port 18 into the columnar space S. Good.

A passage 58 penetrating through the straightening plate 52 is provided, one end of which is connected to the gas supply tube 56, and the other end of the passage is formed as a suction opening which is opened to the communication opening 50. It may be.

The fluid supply device 24 includes a suction pipe 26 for drawing the target liquid L, a pressure feeding device 30 for pressure feeding the drawn target liquid, and a mixing section (34) for mixing gas with the drawn target liquid. The target liquid mixed with the gas may be introduced under pressure from the inlet 18.

Further, one end opening 5 of gas supply tube 56 is provided.
6a may be fixedly disposed near the gas-liquid outlet 22.

When the columnar space is cylindrical and the diameter and height are constant, the inlet and the gas-liquid outlet are 1.5 to 2.0 in diameter ratio (however, the diameter of the inlet is <1/3 of the diameter of the columnar space).

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The microbubble supply device arranges a swirl container in a target liquid such as a plant and animal cultivation liquid, a water purification treatment water, a dam lake or the like, generates so-called microbubbles, and generates microbubbles in the target liquid. This is a means for supplying micro-bubbles that directly fills and supplies micro-bubbles to increase the amount of stored oxygen and promotes the growth of animals and plants, biological oxidation, etc., as well as the purification of treated water and the activation of dam lake water.

FIGS. 1 to 3 show a swirl container 12 which is one component of the fine bubble supply apparatus according to the present invention. In the figure, a swirling container 12 is formed of a rectangular parallelepiped container made of synthetic resin or the like, and has a cylindrical space S having a shape capable of swirling both gas and liquid therein, and a peripheral wall having a certain thickness. It has a portion 14 and two lid portions 16 integrally provided at both ends of the peripheral wall portion 14 so as to close the inside. The internal space of the swirling container may be a space capable of gas-liquid swirling, and may be a square, a pentagon, a hexagon, or another polygonal column. Preferably, the shape is cylindrical as in the embodiment. Also,
The shape of the container body is not limited to a rectangular parallelepiped, but may be a cylindrical shape, a polygonal tube shape, or any other shape. The material may be a water-resistant metal, alloy, ceramic or other material, but it is preferable to use a synthetic resin molded body integrally or processed from the viewpoint of ease of production and production cost.

In FIGS. 1, 2, and 3, the peripheral wall portion 14 communicates with at least the columnar space S so as to blow out in the tangential direction of the swirl circumference 100 of the liquid that swirls together with the gas inside the space S. There are provided two inlets 18 to be introduced into the inside. In the embodiment, the inlet 18 is provided by joining a hollow cylindrical body 20 protruding outward from one peripheral wall plane, which is the peripheral wall part 14 of the container body, and the hollow part has a cylindrical space S. The inside is communicated so as to be tangential to the peripheral surface of the cylinder. The inlet 18 is set at a symmetrical separation position with respect to a longitudinal section including the center of the axial length of the columnar space S. Inlet 18 is always 2
The number is not limited to one, but may be one, three, or more.

A gas-liquid outlet 22 is provided at the center of each of the rectangular lids 16 of the swirl container 12, that is, on the extension of the inner column space S in the axial direction. That is, these gas-liquid outlets 22 are provided at positions symmetrical with respect to the central longitudinal section of the columnar space S, and are formed with circular opening areas of substantially the same size.
The gas-liquid outlet 22 guides the liquid, which is introduced into the swirl container together with the fine bubbles generated inside the swirl container and swirls and rotates, to the outside, that is, the target liquid, and discharges the liquid. Each of the lids 16 is simply a plate body, and the gas-liquid outlet 22 is simply formed at the center thereof as a hole communicating between the inside and the outside. It comes into contact with the outside of the container 12.

The swirling container of the microbubble supply device of the present invention comprises:
A liquid and a gas or a gas-liquid mixed fluid is pumped from the tangential side of the columnar space to generate microbubbles by swirling at high speed inside. Therefore, the inlet 18 matches the diameter of the microbubbles to be generated or corresponds to It is not necessary to set the size to a small one, and for example, it may be set to a size of about 1 cm. When the size of the microbubbles to be generated is pressure-fed from the inlet 18 as gas-liquid, it is preferable to provide a means capable of continuously changing or selectively changing the size by adjusting the amount of air to be injected or sucked. . In this embodiment, as described later, air is mixed into the liquid from the introduction port 18 and the liquid is pressure-fed into the swirling container as gas-liquid.

In this embodiment, the total area of the two gas-liquid outlets 22 provided on the two lids 16 is set to be larger than the total area of the inlet 18 for introducing gas and liquid from the tangential direction. I have. The total area of the gas-liquid outlet 22 side is the inlet 18
When the total area of the swirl container is smaller than the total area of the swirl container, considering that the shape and volume conditions of the hollow cylindrical body of the swirl container are the same, the fluid in the gas and liquid does not rotate at high speed, and thus the swirl cavity portion 208 has an elongated shape that does not sufficiently develop. Only small diameter cavities occur. Therefore, the negative pressure itself is unlikely to be generated by gas-liquid introduced from the outside, and as a result, it is impossible to stably generate fine bubbles. By setting the outlet 22 large, the fluid is smoothly introduced from the inlet 18, performs high-speed rotation in the swirl container, and generates a large-diameter air column, that is, a swirl cavity portion, and secures a large negative pressure portion. As a result, a large amount of fine bubbles are generated reliably and in large quantities.

According to an experiment, when the columnar space S has a cylindrical shape and the diameter P and the height Q are constant, the diameter R of the inlet 18 and the diameter T of the gas-liquid outlet 22 are expressed by a diameter ratio. It has been confirmed that when the diameter is 1.5 to 2.0 (where the diameter of the inlet port is smaller than one third of the diameter of the columnar space), many and large-sized fine bubbles are generated. For example,
In the case of a swirling container having two inlets 18 as shown in FIG. 3, each inlet diameter R which can form an area ratio between the inlet and the outlet determined by the above ratio, and a gas-liquid conduit The outlet diameter T may be determined. In other words, even when one or two or more inlets 18 are provided, fine bubbles are reliably generated by configuring the inlets and outlets in an area ratio determined by the ratio. At this time, the diameter R of the inlet is set to ensure high-speed swirling motion of the fluid inside the container.
Needs to be not more than one third of the diameter P of the columnar space.

As shown in FIG.
Further includes a fluid supply device 24 connected to the inlet 18 of the swirl container 12. The fluid supply device 24 draws in a target pipe L for drawing in the target liquid L, a pumping device 30 such as a pump for pumping the drawn target liquid into the target liquid L again through a pressure pipe 28, and a gas such as atmospheric air. And a gas mixing device 32 as a mixing unit for mixing with the target liquid. In this embodiment, the fluid supply device 24 draws the target liquid L to the ground side via a suction pipe 26 by a pump as a negative pressure pumping device,
A gas-liquid circulating supply means for mixing the air by the gas mixing device 32 and feeding the mixed air to the swirl container 12 in the target liquid again is formed. At one end of the suction pipe 26, a suction part 33 such as a strainer, which is disposed in the target liquid, is provided. The gas mixing device 32 has a configuration in which a compressor 34, an air pressure adjusting valve 36, and a pressure gauge 38 are connected to each other by communicating with an air supply pipe 40, and one end of the air supply pipe 40 is located at an intermediate position of the pressure supply pipe 28. By connecting the compressed air to the liquid to be fed under pressure, the gas-liquid mixed fluid is pressure-introduced from the tangential direction into the swirl container 12 immersed in the target liquid. The air supply pipe 40 may be connected to an arbitrary position with respect to the pressure supply pipe 28. As described above, since the pressure is fed in advance into the swirl container in the target liquid in a gas-liquid mixed state on the ground side, it is possible to prevent the pressure feeding tube from being clogged. In the embodiment, the gas-liquid mixed fluid is supplied to the inlet 1
8, the liquid and the gas may be separately introduced into the swirl container.
The liquid may be introduced tangentially into the swirl vessel, while the gas may be introduced into the swirl vessel from any direction in any connection manner.

The air pressure adjusting valve 36 is an air pressure adjusting means for adjusting the amount of compressed air supplied from the compressor 34, and functions as a size adjusting means for fine bubbles generated in the swirl container 12.

Next, the operation of the fluid in the swirl container of the fine bubble supply device 10 according to the embodiment will be described with reference to FIGS. In FIG. 5, the gas-liquid introduced into the inside of the swirl container 12 from the inlet 18 is swirled around the line XX connecting the centers of the gas-liquid outlets 22 of the lids 16 at both ends or in the vicinity thereof. An axis forms a swirling flow of gas-liquid swirling at high speed. In FIG. 5, the swirling flow of gas-liquid sent from the inlet is swirled toward the middle part of the gas-liquid outlet 22 at both ends, and moves toward the middle swirling flow 200 and toward both ends of the container. End-side swirling flow 202 that moves while turning
Shunted. The intermediate swirling flows 200 introduced from the two inlets 18 move while swirling toward the central part of the container, respectively, and the central part 204 of the container where they meet.
The direction of movement is reversed at the position, and the vicinity of the swirling flow center axis XX is moved toward the gas-liquid outlet 22 of the container. The intermediate swirling flow 200 and the end swirling flow 202 merge near immediately before the gas-liquid outlets 22 on both ends, and become a swirling flow 206 to be discharged from the gas-liquid outlet 22.

More specifically, in FIGS. 6 and 7, the intermediate-side swirling flow 200 and the end-side swirling flow 2 which are introduced into the swirling container from the inlet 18 from the tangential direction of the columnar space S and swirl at high speed.
02 is compressed by the centrifugal force exceeding the viscous force of the liquid toward the inner wall of the container forming the columnar space from the swirl center axis XX, and a negative pressure is generated by the centrifugal force near the swirl center axis. A long swirling cavity portion 208 is formed along the axial direction of the columnar space. Further, centrifugal force and suction force act simultaneously near the swirling flow central axes of the swirling flows 200 and 202, and a tensile force is generated to be in a reduced pressure state. Then, the swirling flows 200 and 20 are generated in the swirling cavity portion 208 in a reduced pressure state by boiling under reduced pressure, that is, gasification of a gas contained by the reduced pressure.
The dissolved gas dissolved in 2 becomes fine bubbles 210 and is generated. The fine bubbles 210 are discharged from the gas-liquid outlets 22 on both sides along with the discharge swirling flow 206 while accompanying the flow of the swirling flows 200 and 202.

The gas-liquid outlet 2 from the columnar space S in the swirl vessel
The fluid has a complicated effect when it is led out through 2. At the column-shaped space S side, that is, on the inner surface side near the outlet 22, an internal depressurized portion 212 is formed by the interaction between the discharge swirling flow 206 and the swirling cavity portion 208, and an external depressurized portion is also formed at the outer edge of the outlet 22. 213
And micro bubbles are also generated from these portions by the action of boiling under reduced pressure.

In FIG. 8, the centrifugal force acts on the gas, the centrifugal force acts on the gas due to the difference in the specific gravity of the gas and liquid, and the liquid flows toward the outer peripheral side of the swirl flow in the swirl flow in the swirl vessel 12. As it moves, the gas moves toward the center of the swirling flow. Further, the gas is accumulated in the swirling cavity portion 208 near the center of the swirling flow swirling axis, and moves toward the front end side 220 of the columnar space of the swirling cavity portion along with the surrounding liquid flowing toward the gas-liquid outlet 22 while swirling at high speed. On the tip side 220 of the swirling cavity portion, a liquid level 222 around the swirling cavity portion, which has the same boundary as the swirling cavity portion of the swirling flow to be discharged from the swirling container 12, and swirling by the negative pressure of the swirling cavity portion The circumferential liquid surface 224 at the tip of the swirl container external liquid to be drawn into the cavity is plugged into the swirl cavity portion by the action of the viscous force of water and the suction force due to the negative pressure of the swirl cavity portion. Closely adhered. The gas is crushed by the compressive force 226 of the two liquid surfaces 222 and 224 when passing through the contact portion. Further, the swirling speed of the swirling flow becomes faster at the gas-liquid outlet 22 having a smaller radius than the inner wall of the swirling container 12, and a shearing force due to a difference in swirling speed is generated near the boundary between the swirling container 12 and the gas-liquid outlet. At this time, the gas becomes small divided bubbles 210a due to the compressive force and the exclusive force of the two liquids. Therefore, if the amount of gas-liquid mixture at the inlet 18 is increased, the negative pressure in the swirling cavity portion is weakened, the adhesion between the liquid surfaces 222 and 224 is reduced, the compressive force acting on the gas is reduced, and the bubble diameter is increased. Become. Conversely, if the gas mixing amount is reduced, the bubble diameter becomes smaller. This makes it possible to generate bubbles of a desired size by increasing or decreasing the amount of pressurized gas-liquid mixed gas. Specifically, fine adjustment of the bubble size is performed by adjusting the air pressure adjusting valve 36 as the air pressure adjusting means described above to adjust the amount of compressed air supplied to the pressure feed pipe 28 within a range where the internal pressure does not become a positive pressure. Becomes

Thus, fine bubbles are continuously and stably supplied into the target liquid, and the amount of oxygen contained therein is increased to realize water purification, promotion of cultivation of cultured animals and plants, activation of water in a closed water area, and the like. At the same time, a large amount of fluid can be supplied into the target liquid from the gas-liquid outlet to simultaneously generate a circulating flow.

Next, a fine bubble supply apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 10. The same members as those in the first embodiment are denoted by the same reference numerals, and details thereof are described. Detailed description is omitted. In this embodiment, the peripheral wall portion 14
Inside, a rectifying plate 52 having a communication opening 50 is fixed so as to intersect the axial direction of the columnar space S. Rectifier plate 5
Reference numeral 2 denotes a swirl rectification unit that ensures that a liquid introduced from a tangential direction does not become a turbulent flow in the swirl container but generates a high-speed swirl flow. As a result, the generation of fine bubbles is reliably caused.

In this embodiment, the space S is divided into two parts at a central portion in the axial direction of the columnar space S so as to be orthogonal to the axial direction. 12 are fixed to the inner wall. Two inlets 18 for introducing the liquid into the columnar space tangentially from both sides of the current plate 50 are arranged at equal intervals from the mounting position of the current plate.

In this case, an air inlet 54 or a gas inlet is provided in the swirl container separately from the two inlets 18. An air supply pipe composed of a gas supply tube 56 is connected to the air inlet, and air is sent into the swirl container while suctioning air under a negative pressure from a gas intake opening arranged on the outside air side to mix the swirl flow of the liquid. Generates fine bubbles. In this way, the gas is suctioned at a negative pressure, thereby omitting the compressor and the supply pipe of the air supply system, simplifying the device configuration and realizing a reduction in manufacturing cost. As in the present invention, since fine bubbles are generated only by the swirling motion of the fluid in the swirling container, the opening area of the gas-liquid outlet 22 provided at both ends of the container does not have to be extremely small, and therefore, Since the diameter of the gas introduction port 54 can be set to be somewhat large together with the liquid introduction port, the gas is not easily clogged.

Further, in this embodiment, a passage 58 is provided inside the current plate 52, one end of which is connected to the gas supply tube 56, and the other end is formed as a suction port opened to the inside of the columnar space. The air inlet 54 of FIG. That is, the air inlet 5 as an air inlet
Numeral 4 introduces air into the communication opening 50 of the donut disk-shaped current plate. Therefore, in this case, the current plate 52
The gas introduction position is introduced at a position where gas and liquid can be easily mixed without waste in combination with the rectifying swirling action of the above, so that the efficiency of generation of fine bubbles can be improved.

Next, a fine bubble supply apparatus according to a third embodiment of the present invention will be described with reference to FIGS. 11 and 12. The same members as those in the above embodiment are denoted by the same reference numerals, and details thereof will be described. Detailed description is omitted. In this embodiment, one end opening 56a of the gas supply tube 56 is connected to the gas-liquid outlet 22.
It is fixedly arranged in the vicinity. Two inlets 18 are provided at symmetrically spaced positions from the axial center of the columnar space so as to introduce the fluid into the columnar space from the tangential direction. In this embodiment, for example, only the target liquid L is introduced from the two introduction ports 18. Then, one end opening of the gas supply tube 56 is connected to the swirling cavity portion 2.
A fixed member (not shown) is supported on the swirling container and fixed so as to face the periphery of the gas-liquid outlet 22 at 08, that is, the opening of the gas-liquid outlet 22 in the swirl container. In this case, the opening of the gas-liquid outlet 22 is a columnar space S
Swiveling cavity part 2 in the figure, which is formed in the central axis part of the inside
08 and the external decompression portion 213 are continuous portions.
a) to take in the inside of the swirl container while aspirating external air from a, to generate further fine bubbles by swirling motion while mixing the gas and liquid, and to derive and supply the fluid containing the fine bubbles to the outside again from the gas-liquid outlet 22. Can be.

The above-described fine bubble supply apparatus can be applied to, for example, hydroponics, cultivation of animals and plants, biological purification, floating separation of suspended matter in water, cultivation of aquatic plants, aquarium for aquarium fish, and the like.

[Example 1] A microbubble supply device of the present invention was installed in a fish farm (10,000 square meters, water depth 6).
m, aquarium water depth 5.5 m). The swirling container is arranged in the target liquid in the water tank, and 100 V of the fluid supply device 24,
A pumping tube composed of a vinyl chloride pipe was connected to the pump by a 200 W pump and connected to the inlet of the swirling container.
In addition, 100 V, 7
A small compressor having a power of 50 W and a discharge pressure of 8 kgf / cm 2 was used. The air pressure adjusting valve 36 is connected to the compressor, the pressurized air is adjusted and sent to the swirling container under pressure, fine bubbles are generated in the container and supplied into the liquid in the water tank, and the amount of oxygen stored in the target liquid. Was measured. From the measurement results, it was confirmed that the amount of dissolved oxygen was greatly increased, and that the amount of dissolved oxygen was increased in the entire tank in a short time.

Example 2 A swirl vessel 10 is immersed in a biotope pond (area of 20 square meters, water depth 0.6 m) in a water stop area, and a flow straightening plate is provided in the swirl vessel described as the second embodiment. A fine bubble supply device of a type in which only the pressure was fed from the inlet 18 and the air was suctioned from the outside under a negative pressure was applied. In the biotope pond, aquatic plants such as wasabi, mizubashio, kuromo, hiramo and hozakinofusamo, and animals and plants having different habitats such as fish such as yamame trout, fish, crucian carp, firefly and firefly, and aquatic insects were simultaneously observed.
By increasing the available oxygen supply efficiency of animals and plants in the cold water area, the inhabitable limit temperature could be raised several degrees or more.
Similarly, it has become possible to breed fish in the watershed and stillwater areas at the same time. Further, it has been confirmed that although a long time has passed since the start of the experiment, there was no clogging of the device at all, and the device could be used without maintenance. In addition, the efficiency of oxygen supply can be improved by using only a low-power pump, and maintenance work and equipment costs can be significantly reduced.

[0037]

As described above, according to the microbubble supply device of the present invention, the peripheral wall having a columnar space capable of swirling gas and liquid therein is fixed to both ends of the peripheral wall so as to close the interior. And a swirl container disposed in the target liquid to which the microbubbles are supplied, and the peripheral wall portion communicates with the columnar space so as to blow out in a tangential direction of the gas-liquid swirl circumference at least the liquid. A gas-liquid outlet is provided on each of the lids at a position on the axial line of the columnar space, and both lids are connected to the inlet and are provided in the columnar space. At least a fluid supply device for pressurizing and introducing the liquid is provided, and the fluid supply device generates a swirl flow while pressurizing and introducing at least the liquid in the columnar space in the tangential direction to generate fine bubbles and simultaneously liquid from the gas-liquid outlet. With With a structure in which fine bubbles are led into the target liquid, the swirl container can be manufactured at a low cost with an extremely simple structure that simply provides an inlet and outlet in the cylinder. It does not generate bubbles while finely dividing the gas introduced from the outside, so it is not necessary to make the inlet small, and clogging of the fluid supply pipe and the inlet is not required. Thus, it is possible to provide a fine bubble supply device which is excellent in durability without burden of maintenance. Furthermore, since the gas-liquid is drawn out from both ends of the swirling container, a large discharge amount is obtained, and fine bubbles are supplied into the target liquid in which the device is disposed, thereby increasing the amount of oxygen contained in the target liquid and generating a water flow. By doing so, it is possible to effectively realize water purification and the like.

Further, since the shape of the columnar space is cylindrical, the efficiency of the swirling flow of the fluid introduced into the swirling container from the tangential direction is improved, and fine bubbles are reliably and efficiently generated by the reduced-pressure boiling action. Can be done.

In addition, by employing a configuration in which the total area of the gas-liquid outlet is set to be larger than the total area of the inlet, fine bubbles generated in the swirl container are reliably led out of the container, and Effectively supply fine bubbles into the inside,
Improve the efficiency of supplying oxygen in liquid.

In addition, since a flow straightening plate having a communication opening is fixed in the peripheral wall so as to intersect the axial direction of the columnar space, the fluid introduced into the swirl container from the tangential direction is disturbed. It is possible to rectify the introduced fluid so as to generate a swirling flow without causing the flow to cause a resistance at the time of the swirling flow, and to surely swirl the fluid at a high speed to improve the efficiency of generating fine bubbles.

The swirl container is provided with a gas suction port, and a gas supply tube having a gas intake opening arranged on the ground side is connected to the suction port. From the introduction port, a target liquid enters the columnar space. By adopting a configuration in which the gas is supplied, only the gas is separately suctioned into the revolving container under a negative pressure, so that a compressor such as a compressor for gas pressure feeding and an operating power cost are not required. Also, the gas inlet may not be so small, and clogging is unlikely to occur.

Further, by providing a passage which penetrates the inside of the flow straightening plate, one end of the passage is connected to the gas supply tube at one end, and the other end of the passage is formed as a suction port opened to the communication opening. Since the suction gas is introduced into the communication opening from the rectifying plate that performs the rectifying action of the fluid, it is possible to efficiently distribute the liquid to the entire swirling flow of the liquid and generate fine bubbles while introducing the gas from the central portion. it can.

Further, the fluid supply device includes a suction pipe for drawing in the target liquid, a pumping device for pumping the drawn target liquid, and a mixing section for mixing the gas with the drawn target liquid. With the configuration in which the target liquid is pressure-introduced from the inlet, it is possible to realize a configuration in which the target liquid is drawn and circulated and fed into the swirl container in the target liquid in a gas-liquid mixed state. Further, by providing an air pressure adjusting means in the mixing section to adjust the amount of mixed air, it is possible to adjust the size of fine bubbles generated in the swirl container.

Further, since one end opening of the gas supply tube is fixedly arranged near the gas-liquid outlet, the outside air is sucked from the one end opening of the gas supply tube by the negative pressure suction force. While taking it inside the swirl container,
Whilst mixing gas and liquid, a fine bubble is generated by swirling motion,
The fluid containing fine bubbles is derived again from the gas-liquid outlet,
It is possible to supply the fine bubbles and ensure the effective supply of the fine bubbles into the target liquid.

When the columnar space is cylindrical and the diameter and height are constant, the inlet and the gas-liquid outlet are 1.5 to 2.0 in diameter ratio (provided that the diameter of the inlet < By adopting a configuration that is one third of the diameter of the columnar space, it is possible to reliably generate a large number of fine bubbles with a small size regardless of the number of inlets provided in the swirling container. .

[Brief description of the drawings]

FIG. 1 is a side view of a swirl container of a fine bubble supply device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an explanatory diagram of the entire configuration of the fine bubble supply device of the first embodiment.

FIG. 5 is an explanatory view of a swirling flow action inside the swirling container.

FIG. 6 is an explanatory view of a swirling flow action similarly in the swirling container.

FIG. 7 is a sectional operation explanatory view of FIG. 6;

FIG. 8 is an explanatory view of the action of the fluid around the periphery of the swirl container outlet.

FIG. 9 is a side view of a swirl container of the fine bubble supply device according to the second embodiment of the present invention.

FIG. 10 is an explanatory view of a swirling flow action inside the container.

FIG. 11 is a side view of a swirl container of a fine bubble supply device according to a third embodiment of the present invention.

FIG. 12 is an explanatory view of a swirling flow action inside the container.

FIG. 13 is an explanatory diagram of a conventional bubble generation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fine bubble supply apparatus 12 Revolving container 14 Peripheral wall part 16 Lid 18 Inlet 22 Gas-liquid outlet 24 Fluid supply apparatus 26 Intake pipe 32 Gas mixing apparatus 36 Air pressure control valve 50 Communication opening 52 Straightening plate 54 Air introduction port 56 Gas supply Tube 210 Microbubble L Target liquid

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01J 4/00 102 B01J 4/00 102 C02F 3/20 ZAB C02F 3/20 ZABC F-term (Reference) 2B104 EB20 2B314 MA23 PA09 4D029 AA01 AB05 BB01 BB11 BB13 4G035 AB05 AB15 AC44 AE13 4G068 AA03 AB01 AB07 AD50

Claims (9)

[Claims] 1. A target liquid to which fine bubbles are supplied, comprising: a peripheral wall portion having a columnar space capable of swirling gas and liquid therein; and lid portions fixed at both ends of the peripheral wall portion so as to close the inside. The peripheral wall portion has an inlet which communicates with the columnar space so as to blow out in a tangential direction of the gas-liquid swirl circumference and has at least a liquid inlet introduced into the columnar space, and both lid portions. A gas-liquid outlet is provided at a position on the axial line of the columnar space, and a fluid supply device connected to the inlet to pressurize and introduce at least liquid into the columnar space is provided. A micro-bubble supply device that generates a swirling flow while pressurizing and introducing at least a liquid in a tangential direction into a columnar space to generate micro-bubbles and simultaneously discharges the micro-bubbles together with the liquid into a target liquid from a gas-liquid outlet. 2. The columnar space has a cylindrical shape.
The microbubble supply device as described in the above. 3. The fine bubble supply apparatus according to claim 1, wherein the total area of the gas-liquid outlet is set to be larger than the total area of the inlet. 4. The fine bubble supply device according to claim 1, wherein a flow straightening plate having a communication opening is fixed in the peripheral wall portion so as to intersect the axial direction of the columnar space. 5. A swirling container is provided with a gas suction port, a gas supply tube having a gas intake opening arranged on the ground side is connected to the suction port, and a target liquid is introduced into the columnar space from the introduction port. The fine bubble supply device according to any one of claims 1 to 4, which is supplied. 6. A suction port provided with a passage penetrating through the straightening plate, one end of the passage connected to the gas supply tube, and the other end of the passage opened to a communication opening.
The microbubble supply device as described in the above. 7. A fluid supply device comprising: a suction pipe for drawing in a target liquid; a pumping device for pumping the drawn target liquid; and a mixing unit for mixing a gas with the drawn target liquid. The microbubble supply device according to any one of claims 1 to 4, wherein the target liquid is introduced under pressure from an inlet. 8. The microbubble supply device according to claim 5, wherein one end opening of the gas supply tube is fixedly disposed near the gas-liquid outlet. 9. When the columnar space has a cylindrical shape and the diameter and height are constant, the inlet and the gas-liquid outlet are 1.5 to 2.0 in diameter ratio (provided that the diameter of the inlet < The microbubble supply device according to any one of claims 1 to 8, wherein the diameter is one third of the diameter of the columnar space.