JP5936168B1 - Underwater oxygen dissolution apparatus and underwater oxygen dissolution method using the same - Google Patents

Abstract

Using an underwater oxygen dissolving device capable of efficiently generating bubbles and promoting the movement of oxygen contained in the bubbles into a fluid while using a simple configuration to reduce power consumption and the like A method for dissolving oxygen in water is provided. A closed space is formed between the cylindrical tank formed as a vortex of the fluid injected into the inside, an inner pipe having a plurality of intake holes formed in the side wall, and the inner pipe provided around the inner pipe. An outer pipe provided with an air inflow means for forming and flowing air into the closed space; a cylindrical downcomer pipe; a box-type storage tank in which a fluid in which bubbles are formed is dropped and stored; An ultrasonic oscillator in which bubbles are crushed by emitting ultrasonic waves toward the fluid stored in the tank.

Description

  The present invention relates to an underwater oxygen dissolving apparatus for improving water quality and an underwater oxygen dissolving method using the same, and more particularly, air is sucked into a vortex formed by natural flow to generate bubbles, which are generated by an ultrasonic oscillator. The present invention relates to an underwater oxygen dissolving apparatus that increases the concentration of oxygen dissolved in water by crushing bubbles and an underwater oxygen dissolving method using the same.

Conventionally, techniques for increasing the concentration of oxygen dissolved in water have been used for the purpose of improving water quality in closed areas such as purification facilities, lakes, ponds, and dams. A typical example of such a technique is the use of “bubbles”. This has the effect of increasing the amount of oxygen transfer from the gas side to the liquid side by increasing the contact area between the gas and the liquid, for example, a method of sending compressed air to a porous air diffuser, A method of forming a shear flow by rotating a rotating blade or a gas jet and feeding air into the shear flow, or a method of generating microbubbles or nanobubbles has been implemented.
However, the above-described technology requires, for example, a large compressor for gas compression and the like, and the apparatus becomes large. As a result, there has been a problem that the amount of power consumption and maintenance is enormous.
In particular, when a porous air diffuser is used, there is a problem in that the pores are blocked by fine particles or impurities in water and the generation efficiency of bubbles is reduced.
Furthermore, in the case of using the rotating blades, there are problems that the power consumption for rotating the rotating blades at a high speed is increased and that the rotating blades are damaged and corroded due to cavitation occurring at this time.
Therefore, in order to solve such problems, in recent years, a technology related to a bubble generating device that can suppress power consumption and the like and can efficiently generate bubbles has been developed with a simple configuration. Several inventions have already been disclosed.

First, Patent Document 1 discloses an invention relating to a wastewater treatment device that can efficiently generate bubbles under the name of “wastewater treatment device”.
Hereinafter, the invention disclosed in Patent Document 1 will be described. The invention relating to the wastewater treatment device disclosed in Patent Document 1 includes a suction aerator formed by exposing a porous fluid wastewater transfer pipe to the atmosphere.
According to the wastewater treatment apparatus having such characteristics, the average diameter of the generated bubbles can be reduced to several hundreds μm to several tens μm. Therefore, the contact area between the waste water and the oxidizing gas bubbles can be increased to about 10 to 100 times that of the conventional method, and the residence time of the bubbles can be increased to 10 to 100 times. Therefore, the amount of dissolved oxygen can be dramatically increased.

  Next, Patent Document 2 discloses an invention relating to a microbubble generator having a simple structure under the name “microbubble generator”. The invention disclosed in Patent Document 2 is a microbubble generator that introduces gas into a liquid and generates microbubbles in the liquid, and includes a liquid storage section for storing the liquid, and the liquid in the liquid storage section. A liquid ejection nozzle having a liquid outlet part, a gas suction nozzle having a gas outlet part arranged at an outer edge part of the liquid outlet part, and a flow rate control device for controlling the flow rate of the gas flowing out from the gas outlet part The gas outlet portion is disposed in the flow path of the liquid ejected from the liquid outlet portion, a negative pressure generating portion is generated at the downstream edge of the gas outlet portion, and the gas is automatically sucked into the liquid. Features. According to the microbubble generator having such a feature, the gas is automatically sucked into the liquid by utilizing the negative pressure generation phenomenon that occurs at the downstream edge of the object disposed in the liquid flow path, and the compressor It is not necessary to install an air supply device such as a gas cylinder or a compression cylinder, and gas can be introduced into the liquid. That is, microbubbles can be efficiently generated in the liquid with a simpler device structure.

Next, Patent Document 3 discloses an invention relating to a wastewater treatment apparatus that performs biological treatment using activated sludge, such as sewage and factory wastewater, under the name of “wastewater treatment apparatus”.
In the waste water treatment apparatus using activated sludge, the invention disclosed in Patent Document 3 is provided with ultrasonic generating means in a reaction tank provided with an air diffuser, and the ultrasonic generating means is connected to an ultrasonic vibrator. It has an ultrasonic transducer unit, and the ultrasonic vibrator is installed in the bubble existing portion.
According to the wastewater treatment apparatus having such characteristics, the effect of reducing the amount of generated sludge and the improvement of the oxygen dissolution efficiency can be achieved simultaneously without providing a large facility installation space outside the reaction tank.

JP-A-5-64795 Japanese Patent Application Laid-Open No. 2012-120988 JP 2007-111598 A

  However, in the invention disclosed in Patent Document 1, it is necessary to increase the amount of water at the same time as increasing the speed of water flowing inside the porous tube in order to generate extremely small diameter bubbles. In addition, if the water flowing inside the porous tube contains fine particles or the like, it is considered that when the bubbles having an average diameter of several hundreds μm to several tens μm are generated, the pores are blocked. Therefore, in the invention disclosed in Patent Document 1, there is a possibility that the problem that the apparatus becomes large and the problem that the generation efficiency of bubbles is lowered cannot be sufficiently solved.

  Next, in the invention disclosed in Patent Document 2, fine bubbles (microbubbles) are formed by the negative pressure generating portion formed when the liquid is ejected from the liquid ejection nozzle. However, the liquid container is filled with a stationary liquid as an initial state, and in order to mix such liquid and the formed fine bubbles, a high ejection speed from the liquid ejection nozzle, for example, high-pressure water is used. Need to use. Therefore, in this case, since a high-pressure water generator is required, there is a possibility that the problem that the apparatus becomes large and the problem that the power consumption is increased cannot be sufficiently solved.

  Furthermore, in the invention disclosed in Patent Document 3, ultrasonic generation means is provided, but the conventional technology is used as it is for the air diffuser for generating fine bubbles. For this reason, there exists a possibility that the subject that the generation | occurrence | production efficiency of a fine bubble falls may not be solved depending on water quality.

  The present invention has been made in response to such a conventional situation, and since it has a simple configuration, it is possible to suppress power consumption and the like, while efficiently generating bubbles and being included in the bubbles. It is an object of the present invention to provide an underwater oxygen dissolving apparatus capable of promoting the movement of oxygen into a fluid and an underwater oxygen dissolving method using the same.

In order to achieve the above object, the underwater oxygen dissolving apparatus according to the first aspect of the present invention is provided with a drop hole at the bottom, so that a fluid injected by natural fall into the inside of the oxygen dissolver circulates above the drop hole. A cylindrical tank that flows into the fall hole and forms a vortex, a straight pipe type inner pipe whose upper end communicates with the drop hole and a plurality of intake holes are formed in the side wall, and And an outer pipe provided with an air inflow means for forming a closed space between the inner pipe and the inner pipe and for introducing air into the closed space, and when passing through the inner pipe, Air is sucked into the fluid from the periphery of the vortex through the air intake hole, and a cylindrical downcomer pipe in which bubbles are formed in this fluid, and the fluid in which the air bubbles are formed fall below the downcomer pipe. Box-type storage tank to be stored and immersed in the storage tank Is, and an ultrasonic oscillator bubbles are crushed by firing the ultrasound toward stored in the storage tank fluid, a plurality of suction holes around the center of the cylinder tank and downcomer, the A plurality of stages are provided along the longitudinal direction of the inner tube while being spaced apart by a second interval, and the fluid that has fallen into the storage tank has a water surface vertically below the downcomer. Is stored in the storage tank so as to have a third interval, and the water is disturbed by the fall of the fluid, and oxygen is dissolved from the surrounding air in the fluid stored in the storage tank. Features.

  In the invention having such a configuration, for example, the cylindrical tank includes an upper opening, and fluid is injected from the upper opening by natural dropping. Since the drop hole is provided at the bottom of the cylindrical tank, the injected fluid flows into the drop hole while circulating around the drop hole, and a vortex is formed. Air is taken into the fluid from the concave inner surface of the vortex.

  Next, the fluid that has flowed into the drop hole passes through the inner pipe constituting the downcomer pipe. In this case, air taken in from the inner surface of the vortex is released from the tip of the vortex, so that bubbles are formed in the fluid. The downcomer is configured to be able to introduce air from the outer tube into the inner tube through the air inflow means and the plurality of intake holes. On the other hand, the negative pressure increases as the vortex approaches the center along the radial direction. Therefore, when the fluid passes downward through the inner tube, air is sucked into the vortex and further bubbles are formed.

  The fluid in which bubbles are formed passes through the inner tube, and then falls and stored in the storage tank. At this time, the bubbles move so as to diffuse into the storage tank.

  Subsequently, cavitation occurs when ultrasonic waves emitted from the emission surface of the ultrasonic oscillator are irradiated to bubbles that are in the process of diffusing into the storage tank. In this cavitation, when the sound pressure (amplitude) of the emitted ultrasonic waves changes periodically, generation and disappearance of bubbles are repeated in the fluid. Therefore, since both the bubbles generated by cavitation and the bubbles formed in the fluid that has passed through the inner tube are crushed, oxygen is dissolved in the fluid stored in the storage tank.

Next, according to a second aspect, in the first aspect, the ultrasonic oscillator has a long axis arranged along the horizontal direction, and the storage tank is disposed on the wall surface or inside thereof. A reflector that reflects a first ultrasonic wave (hereinafter referred to as a first incident wave) emitted from a launch surface to form a first reflected wave is provided, and the reflector includes the first incident wave. And the first reflected wave are combined to form a first standing wave, and the first launching surface is spaced apart from each other.
In the invention with such a configuration, the reflector has a structure having a flat surface. Since the major axis of the ultrasonic oscillator is arranged along the horizontal direction, the plane of the reflector is installed along the vertical direction orthogonal to the horizontal direction.
In addition, the “node” and the “antinode” formed in the first standing wave have the maximum and minimum ultrasonic sound pressures, respectively, so that the “node” and the position where the fluid falls coincide with each other. In addition, by arranging the downcomer, the reflector, and the ultrasonic oscillator in the horizontal direction, the bubbles are crushed most efficiently.

Further, according to a third aspect, in the first aspect, the ultrasonic oscillator has a second launch surface arranged vertically upward, and the storage tank is launched from the second launch surface. A reflection surface that reflects ultrasonic waves (hereinafter referred to as a second incident wave) to form a second reflected wave is formed, and the second emission surface has a second incident wave and a second reflected wave. The second standing wave is synthesized so as to form a second standing wave, and is arranged with a space from the reflecting surface.
In the invention with such a configuration, the reflection surface may be, for example, the water surface of the fluid stored in the storage tank. This is because the second incident wave is reflected on the water surface to form a second standing wave. In addition, the height position from the bottom part of the storage tank of a reflective surface is determined by adjusting the wavelength of an ultrasonic wave, and the water level of the fluid stored in a storage tank.
In the invention of the above configuration, even in the second standing wave, “nodes” and “antinodes” are formed, so when the fluid containing the bubbles reaches the “nodes”, the bubbles are most efficiently crushed. The

According to a fourth aspect of the present invention, in any one of the first to third aspects, the ultrasonic oscillator is housed in a housing body having an opening on at least one end surface.
In the invention with such a configuration, in addition to the action of any one of the first to third inventions, ultrasonic waves other than those that propagate in a concentrated manner in front of the ultrasonic oscillator are caused to enter the fluid as spherical waves by the container. Propagation is suppressed. That is, the ultrasonic wave whose propagation is suppressed is reflected by the container and the water surface and generates a water flow in the container. This water flow diffuses slowly into the storage tank through the opening.

The fifth invention is characterized in that, in any one of the first to fourth inventions, the ultrasonic oscillator is provided with a vibrating body on a launch surface thereof.
In the invention having such a configuration, when the vibrating body resonates at the frequency of the ultrasonic wave emitted from the emission surface of the ultrasonic oscillator, the amplitude of the ultrasonic wave increases and the pressure increases. Therefore, more bubbles are reliably crushed with less input energy.

And the underwater oxygen dissolution method which concerns on 6th invention is provided with the fall hole in the bottom part of a cylindrical tank, The fluid inject | poured by the natural fall into the inside is circulating this fall hole above this fall hole. flows into a vortex forming step is formed by a swirl (S1), the inner tube of the straight tube having a plurality of suction holes are formed in the side wall with its upper end communicates with the drop hole, among the A cylindrical downcomer pipe comprising an outer pipe provided around the pipe and forming an enclosed space with the inner pipe and having air inflow means for flowing air into the enclosed space, and passes through the inner pipe. At the same time, air is sucked into the fluid from the periphery of the vortex through the air inflow means and the plurality of intake holes, and a bubble forming step (S2) in which bubbles are formed in the fluid, and the fluid in which the bubbles are formed falls and is stored. Storage step (S3) stored in the tank, and storage tank From the ultrasonic oscillator is immersed therein, toward the fluid bubbles stored in the storage tank is formed by the ultrasonic wave is emitted, with the bubble collapse step (S4) in which bubbles are crushed, and The plurality of intake holes are formed with a first interval around the center of the cylindrical tank and the downcomer pipe, and are provided in a plurality of stages along the longitudinal direction of the inner tube with a second interval. The fluid that has fallen into the storage tank is stored in the storage tank so that the water surface has a third interval vertically downward from the downcomer, so that the turbulence occurs due to the fall of the fluid on the water surface. It is characterized in that oxygen is dissolved in the stored fluid from the surrounding air .
The invention having such a configuration has the same function as the first invention.

According to 1st invention, many bubbles can be formed in the inside of a fluid by the natural flow of a fluid by a cylindrical tank and a downcomer. That is, since a porous tube, a compressor, and the like as in the prior art are unnecessary, a simple configuration is realized, and it is possible to prevent the apparatus from becoming large. Therefore, it can be manufactured at a low cost and the power consumption and the like can be suppressed.
In addition, the fact that the porous tube is unnecessary can prevent the bubble generation efficiency from being reduced due to clogging of the pores. Therefore, it is possible to generate bubbles efficiently.
Furthermore, it is possible to promote the movement of oxygen contained in the bubbles into the fluid by crushing the bubbles in the fluid stored in the storage tank with an ultrasonic oscillator. Since the bubbles in the fluid stored in the storage tank include bubbles generated by cavitation and bubbles formed in the fluid that has passed through the inner tube, the ultrasonic oscillator, the cylindrical tank, By providing the downcomer, the oxygen dissolution efficiency can be increased.

  According to the second invention, in addition to the effects of the first invention, the bubbles are crushed most efficiently by matching the “node” formed in the first standing wave with the position where the fluid falls. Therefore, the dissolved concentration of oxygen in the fluid can be further increased.

  According to the third aspect, the same effect as that of the second aspect can be exhibited.

  According to the fourth invention, in addition to the effects of any one of the first to third inventions, the water flow generated in the container diffuses into the storage tank through the opening, and thus is stored in the storage tank. The fluid can be agitated to uniform the dissolved concentration of oxygen inside the reservoir.

  According to the fifth aspect, in addition to the effects of any one of the first to fourth aspects, the power consumption of the ultrasonic oscillator can be reduced, and the dissolved concentration of oxygen in the fluid can be further improved. it can.

  According to the sixth aspect, the same effect as in the first aspect is obtained.

1 is a configuration diagram of an underwater oxygen dissolving device according to Embodiment 1. FIG. (A) And (b) is the AA arrow directional cross-sectional view and BB line arrow directional cross-sectional view in FIG. 1, respectively. It is a longitudinal cross-sectional view of the cylindrical tank and downcomer which comprise the underwater oxygen dissolving apparatus which concerns on Example 1. FIG. (A) And (b) is the result of having compared the dissolved oxygen concentration and electric power consumption of the oxygen submerged apparatus which concerns on Example 1 with a prior art, respectively. (A) is a block diagram of the underwater oxygen dissolution apparatus which concerns on the 1st modification of Example 1, (b) is explanatory drawing for demonstrating the effect | action of the ultrasonic oscillator which comprises this. It is a longitudinal cross-sectional view of the cylindrical tank and downcomer which comprise the underwater oxygen dissolving apparatus which concerns on the 2nd modification of Example 1. FIG. (A) is a block diagram of the underwater oxygen dissolving apparatus which concerns on the 3rd modification of Example 1, (b) is explanatory drawing for demonstrating the effect | action of the ultrasonic oscillator which comprises this. It is a side view at the time of seeing the ultrasonic oscillator which constitutes the underwater oxygen dissolving device concerning the 4th modification of Example 1 from the upper part. (A) is a block diagram of the underwater oxygen dissolution apparatus which concerns on Example 2, (b) is explanatory drawing for demonstrating the effect | action of the ultrasonic oscillator which comprises this. 6 is a side view of an ultrasonic oscillator that constitutes an underwater oxygen dissolving device according to a modification of Example 2. FIG. 6 is a process diagram of an underwater oxygen dissolving method according to Example 3. FIG.

The underwater oxygen dissolving apparatus of Example 1 according to the embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a configuration diagram of an underwater oxygen dissolving device according to a first embodiment.
As shown in FIG. 1, the underwater oxygen dissolving apparatus 1 according to the present embodiment is provided with a drop hole 2a in the bottom 2b, so that the fluid 10 injected into the inside becomes a vortex 11 (see FIG. 3). A cylindrical tank 2 that is formed in this manner, an inner pipe 3 whose upper end 3a communicates with the drop hole 2a, and a plurality of intake holes 6 (see FIG. 3) are formed in the side wall 3b, and the inner pipe 3 When it passes through the inner tube 3, the outer tube 4 is provided with an air inflow means 7 that forms a closed space 13 with the inner tube 3 and is provided with air inflow means 7 for flowing air into the closed space 13. A cylindrical downcomer pipe 5 in which air is sucked into the fluid 10 from the periphery of the vortex 11 through the air inflow means 7 and the plurality of intake holes 6, and the vertical direction of the downcomer pipe 5 is formed. The fluid 10 arranged below and in which the bubbles 12 are formed falls and is stored. The bubble 12 is crushed by emitting ultrasonic waves toward the fluid 10 stored in the storage tank 8 and the box-type storage tank 8 and the storage tank 8 (stars in the figure, hereinafter referred to as the present application). The same) and an ultrasonic oscillator 9.
Among these, the end surface on the opposite side (upper side in FIG. 1) of the bottom 2b forms an upper opening 2d. The storage tank 8 includes side walls 8a and 8b whose surfaces are arranged along the vertical direction V. The ultrasonic oscillator 9 is composed of an ultrasonic transducer 9a and a horn 9b, and is stored in a storage container 14 having a flange 14a. The long axis X extends along the horizontal direction H along the side wall 8b. And an interval L. More specifically, since the horn 9b and the flange 14a are fixed to each other, the ultrasonic oscillator 9 is supported by the side wall 8a of the storage tank 8 via the flange 14a.
Moreover, as the air inflow means 7, for example, an air inflow amount adjusting valve is used, and the inflow amount of air into the closed space 13 can be freely adjusted.

Next, the cylindrical tank and downcomer constituting the underwater oxygen dissolving apparatus according to Example 1 will be further described with reference to FIG. 2A and 2B are a cross-sectional view taken along line AA and a cross-sectional view taken along line BB in FIG. 1, respectively. In addition, about the component shown in FIG. 1, the same code | symbol is attached | subjected also in FIG. 2, and the description is abbreviate | omitted.
As shown in FIG. 2 (a), the cylindrical tank 2 constituting the underwater oxygen dissolving device 1 according to the present embodiment has a bottom 2b, a side wall 2c provided at the periphery thereof, and a drop that opens to the approximate center of the bottom 2b. Hole 2a. The drop hole 2a may be provided at any position on the bottom 2b other than the approximate center of the bottom 2b.
In addition, as shown in FIG. 2 (b), in the downcomer pipe 5 constituting the underwater oxygen dissolving apparatus 1 according to this embodiment, a closed space 13 is formed between the inner pipe 3 and the outer pipe 4. A plurality of intake holes 6 are formed in the inner pipe 3 at intervals of 90 degrees around the center C of the cylindrical tank 2 (see FIG. 2A) and the downcomer pipe 5. The plurality of intake holes 6 need not be microscopic holes that generate microbubbles or nanobubbles, but may have a size capable of generating bubbles having a diameter of about 1 mm, for example. The plurality of intake holes 6 are provided in a plurality of stages along the longitudinal direction of the inner tube 3 with a predetermined interval. However, there are no specific restrictions on the number of stages.

Subsequently, the action of the cylindrical tank and the downcomer constituting the underwater oxygen dissolving apparatus according to Embodiment 1 will be described in detail with reference to FIG. FIG. 3 is a longitudinal cross-sectional view of a cylindrical tank and a downcomer that constitute the underwater oxygen dissolving device according to the embodiment. 1 and 2 are denoted by the same reference numerals in FIG. 3 and description thereof is omitted.
As shown in FIG. 3, when the fluid 10 is injected from the upper opening 2d of the cylindrical tank 2 by natural fall, a drop hole 2a is provided in the bottom 2b, so that the injected fluid 10 is in the drop hole 2a. It starts to flow into the drop hole 2a while circling upward, and a downward flow 11a is generated in the vicinity of the drop hole 2a. Further, as the inflow of the fluid 10 into the drop hole 2a proceeds, a hollow 10a is formed at the center of the circulating fluid 10 to form a rotating flow 11b, and a vortex 11 is formed by the interaction of the descending flow 11a and the rotating flow 11b. The Thus, the vortex 11 formed when the fluid 10 is poured into the cylindrical tank 2 is a so-called bathtub vortex formed by the natural flow of the fluid 10 from a high place to a low place. Air is taken into the fluid 10 from the recess 10a.

Next, the fluid 10 that has flowed into the drop hole 2 a passes through the inner pipe 3 that constitutes the downcomer pipe 5. In this case, air taken in from the recess 10 a is released from the tip of the vortex 11, so that bubbles 12 a are formed in the fluid 10.
The downcomer 5 is configured to be able to introduce air from the outer tube 4 into the inner tube 3 through the air inflow means 7 and the plurality of intake holes 6. On the other hand, the negative pressure increases as the vortex 11 approaches the center along the radial direction. Therefore, when the fluid 10 passes through the inner tube 3 downward, air is sucked into the vortex 11 by the rotating flow 11b of the vortex 11 and the negative pressure described above, thereby forming bubbles 12b. More specifically, a bubble 12b having a diameter of about 1 (mm) is formed at the bottom of the vortex 11. The diameter of the bubble 12b depends on the air inflow amount of the air inflow means 7, the sizes of the plurality of intake holes 6, and the like. In addition, when the inner surface of the vortex 11 rotates and turbulence occurs at the boundary between the gas layer and the liquid layer on the inner surface, the oxygen in the gas layer is dissolved in the vortex 11 in this liquid layer.
Furthermore, the fluid 10 in which the bubbles 12a and 12b are formed passes through the inner tube 3 and then falls and is stored in the storage tank 8 (see FIG. 1). The bubble 12 in FIG. 1 includes the bubble 12a and the bubble 12b in FIG. When the fluid 10 falls, the bubbles 12 a and 12 b move so as to diffuse into the storage tank 8. Furthermore, when the turbulence occurs due to the drop of the fluid 10 on the water surface 10 b of the stored fluid 10, oxygen is dissolved in the fluid 10 from the surrounding air.

Subsequently, when the ultrasonic wave emitted from the ultrasonic oscillator 9 (see FIG. 1) is irradiated to the fluid 10 stored in the storage tank 8, cavitation occurs. In this cavitation, generation and disappearance of bubbles are repeated in the fluid 10 when the sound pressure (amplitude) of the emitted ultrasonic waves periodically changes. Therefore, both the bubbles (not shown) generated by cavitation and the bubbles 12a and 12b formed in the fluid 10 that has passed through the inner tube 3 are crushed. Therefore, the oxygen supplied from the bubbles generated by cavitation and the oxygen supplied from the bubbles 12a and 12b are dissolved in the fluid 10 stored in the storage tank 8. That is, more oxygen is dissolved into the fluid 10 by the amount supplied from the bubbles 12a and 12b.
The side wall 8b (see FIG. 1) of the storage tank 8 is a first standing wave obtained by combining the first incident wave emitted from the ultrasonic oscillator 9 and the first reflected wave reflected by the side wall 8b. Is formed with an interval L (see FIG. 1) from the ultrasonic oscillator 9. Therefore, collapsing efficiency of the bubbles 12a, 12b, etc. can be maximized by making the center C of the downcomer pipe 5 coincide with the “node” of the standing wave. However, if the first standing wave is not formed, it does not mean that the bubbles 12a, 12b and the like cannot be collapsed, but that the efficiency of the collapse can be improved by forming the first standing wave. is there. Therefore, depending on the interval L, even if the first standing wave is not formed, the bubbles 12a, 12b and the like are sufficiently crushed. The effect of maximizing such crushing efficiency will be described later.

Next, the experimental results comparing the effects of the underwater oxygen dissolving apparatus according to Example 1 and the prior art will be described in detail with reference to FIG. 4 (a) and 4 (b) show the results of comparing the dissolved oxygen concentration and power consumption of the underwater oxygen dissolving apparatus according to Example 1 with those of the prior art.
FIG. 4A is a graph in which the amount of increase in dissolved oxygen (dissolved oxygen increase Δ) is plotted, where the horizontal axis represents elapsed time (minutes) and the vertical axis represents dissolved oxygen increase (mg / L). ). In the graph, the black and white circles indicate the underwater oxygen dissolution apparatus 1 according to the first embodiment, the square marks indicate the conventional apparatus (hereinafter referred to as apparatus α), and the white circles indicate the conventional technique and the ultrasonic irradiation. , The results of the devices (hereinafter referred to as device β) combined. The amount of water used at this time is 4 (L).
In FIG. 4 (a), paying attention to the dissolved oxygen increase amount Δ (mg / L) at the elapsed time 30 (min), the underwater oxygen dissolving apparatus 1 according to Example 1 is compared with the apparatuses α and β, respectively. They were 2.4 times (≈5.3 / 2.2) and 1.8 times (≈5.3 / 3.0).
Furthermore, the elapsed time (minutes) required for the dissolved oxygen increase amount Δ equal to 2.2 (mg / L), which is the dissolved oxygen increase amount Δ of the device α at the elapsed time 30 (minutes), is About 16.4 (minutes), in the underwater oxygen dissolving apparatus 1 according to Example 1, it was about 3.1 (minutes). That is, in the underwater oxygen dissolving apparatus 1 according to the first embodiment, 1/10 (≈3.1 / 30) and 1/5 times (≈3.1 / 16.4), respectively, compared with the apparatuses α and β. The elapsed time was shortened.

FIG. 4B shows the elapsed time (until the dissolved oxygen increase amount Δ becomes 2.2 (mg / L) for the underwater oxygen dissolving apparatus 1, the apparatus α, and the apparatus β according to Example 1. Minute), power consumption (Wh), and power consumption ratio.
As shown in the power consumption amount ratio of FIG. 4B, in the underwater oxygen dissolving device 1 according to Example 1, the power consumption was reduced by about 0.26 times compared to the device α.
Thus, according to the underwater oxygen dissolving apparatus 1 according to Example 1, as a result of exerting a significant advantage in terms of an increase in the dissolved oxygen increase amount Δ and a reduction in the power consumption amount as compared with the prior art. became.

As described above, according to the underwater oxygen dissolving device 1 of the present embodiment, a large number of bubbles 12a and 12b are formed in the fluid 10 by the natural flow of the fluid 10 by the cylindrical tank 2 and the downcomer 5. Can do. That is, in order to form bubbles, a dynamic device such as a compressor, a diffuser tube, or a rotary blade required in the prior art is unnecessary. At this time, the amount of air flowing into the closed space 13 can be freely adjusted by adjusting the air inflow amount of the air inflow means 7 and the size of the plurality of intake holes 6, so the size of the bubble 12b is increased or decreased. Can be made. Further, the number of bubbles 12a and 12b can be increased by increasing the speed of the fluid 10 injected into the cylindrical tank 2 and the number of the plurality of intake holes 6, respectively. In addition, since the plurality of intake holes 6 are not micro holes for generating microbubbles or the like, there is no possibility that the fine particles and impurities in the fluid 10 are clogged in the plurality of intake holes 6 and the generation efficiency of the bubbles 12b is reduced. .
Further, according to the underwater oxygen dissolving apparatus 1, a large amount of oxygen can be dissolved in the fluid 10 by crushing the bubbles generated by cavitation and the bubbles 12 a and 12 b with the ultrasonic oscillator 9. Then, the oxygen that has moved to the fluid 10 decomposes harmful substances and bacteria contained in the fluid 10 and enables water purification.
As described above, according to the underwater oxygen dissolving apparatus 1, as shown in FIG. 4, the oxygen dissolution efficiency is remarkably improved and the power consumption is reduced as compared with the conventional technique, as shown in FIG. It can be significantly reduced. Therefore, easy introduction is possible, and by increasing the amount of dissolved oxygen in water, the biodegradation action of pollutants by aerobic microorganisms can be promoted, which can greatly contribute to improving the water quality of the aquatic environment. Is.

Next, an underwater oxygen dissolving apparatus according to a first modification of the first embodiment will be described with reference to FIG. FIG. 5A is a configuration diagram of an underwater oxygen dissolving device according to a first modification of the first embodiment, and FIG. 5B is an explanatory diagram for explaining the operation of the ultrasonic oscillator that constitutes the device. is there. Note that the components shown in FIGS. 1 to 3 are denoted by the same reference numerals in FIG. 5 and description thereof is omitted.
As shown in FIG. 5 (a), in the underwater oxygen dissolving device 1a according to the first modification of the first embodiment, the ultrasonic oscillator 9 has a long axis X arranged along the horizontal direction H and is stored. The tank 8 (see FIG. 1) includes a reflector 16 that reflects the first incident wave emitted from the first emission surface 15 of the ultrasonic oscillator 9 to form a first reflected wave. I have. The first launch surface 15 is the tip surface of the horn 9b.
As shown in FIG. 5B, the reflector 16 has a first launch surface 15 so that the first standing wave 17 is formed by combining the first incident wave and the first reflected wave. are spaced L ₁ between. The reflector 16 is a rigid wall having a flat surface, and is fixed to the storage tank 8 (see FIG. 1) by a support member (not shown). In addition, since the major axis X of the ultrasonic oscillator 9 is disposed along the horizontal direction H, the plane of the reflector 16 is disposed along the vertical direction V.
Other configurations of the underwater oxygen dissolving apparatus 1a are the same as those of the underwater oxygen dissolving apparatus 1 of the first embodiment.

Fluid In such a configuration of the underwater oxygen dissolving device 1a, the first standing wave 17, λ _1/4 (λ ₁ is the ultrasonic waves emitted from the ultrasonic generator 9 is stored inside the reservoir 8 10), a node 17a having an amplitude of zero and an antinode 17b having a maximum amplitude are repeatedly formed. At the nodes 17a and 17b, the sound pressures of the ultrasonic waves are the maximum and minimum, respectively, so that the position where the fluid 10 falls from the nodes 17a and the downcomer 5 coincides with the downcomer 5 in the horizontal direction H. By arranging the body 16 and the ultrasonic oscillator 9, the bubbles 12a, 12b and the like can be crushed most efficiently. Regarding the depth direction (vertical direction V) of the fluid 10 stored in the storage tank 8, the height position of the ultrasonic oscillator 9 is between the maximum depth at which the dropped fluid 10 can reach and the water surface 10b. There is no particular limitation.
Other functions and effects of the underwater oxygen dissolving apparatus 1a are the same as those of the underwater oxygen dissolving apparatus 1 of the first embodiment.

Furthermore, the underwater oxygen dissolving apparatus which concerns on the 2nd modification of Example 1 is demonstrated using FIG. FIG. 6 is a longitudinal cross-sectional view of a cylindrical tank and a downcomer pipe constituting an underwater oxygen dissolving device according to a second modification of the first embodiment. The components shown in FIGS. 1 to 5 are denoted by the same reference numerals in FIG. 6 and the description thereof is omitted.
As shown in FIG. 6, in the underwater oxygen dissolving device 1 b according to the second modification of the first embodiment, in the underwater oxygen dissolving device 1, an annular protrusion 18 is provided around the drop hole 2 a of the cylindrical tank 2. The The protrusions 18 are provided so as to protrude toward the center C, with a vertical cross section having a substantially triangular shape.
Other functions and effects of the underwater oxygen dissolving device 1b are the same as those of the underwater oxygen dissolving device 1 of the first embodiment.

In the underwater oxygen dissolving apparatus 1b having such a configuration, since the diameter of the drop hole 2a is narrowed by providing the protrusion 18, a small vortex 11c is generated immediately below the protrusion 18. Due to the small vortex 11c, some of the bubbles 12c (black circles) in the bubbles 12a are agitated and disappear, and oxygen contained in the bubbles 12c is dissolved in the fluid 10 at that time. Therefore, according to the underwater oxygen dissolving apparatus 1b, the oxygen dissolution efficiency can be improved as compared with the underwater oxygen dissolving apparatus 1.
Other functions and effects of the underwater oxygen dissolving device 1b are the same as those of the underwater oxygen dissolving device 1 of the first embodiment.

Next, an underwater oxygen dissolving device according to a third modification of the first embodiment will be described with reference to FIG. Fig.7 (a) is a block diagram of the underwater oxygen dissolution apparatus which concerns on the 3rd modification of Example 1, FIG.7 (b) is explanatory drawing for demonstrating the effect | action of the ultrasonic oscillator which comprises this. It is. The components shown in FIGS. 1 to 6 are denoted by the same reference numerals in FIG. 7 and the description thereof is omitted.
As shown in FIG. 7 (a), an underwater oxygen dissolving apparatus 1c according to a third modification of the first embodiment includes a cylindrical tank 2, a downcomer pipe 5 and the like with respect to the underwater oxygen dissolving apparatus 1 according to the first embodiment. In addition to the expansion, an ultrasonic oscillator 19 is provided instead of the ultrasonic oscillator 9. The ultrasonic oscillator 19 includes a horn 19 a longer than the horn 9 b of the ultrasonic oscillator 9, but has the same structure as the ultrasonic oscillator 9 except for this.
As shown in FIG. 7B, the reflector 16 is in contact with the first launch surface 15 (the tip surface of the horn 19a) so that the first standing wave 17 having at least two nodes 17a is formed. It arrange | positions at intervals L2. The cylindrical tank 2 and the downcomer pipe 5 are disposed immediately above the two nodes 17a. Note that λ1 is a wavelength when the ultrasonic wave emitted from the ultrasonic oscillator 9 propagates in the fluid 10 stored in the storage tank 8, and λ2 is a wavelength when the ultrasonic wave propagates through the horn 19a. is there.
Other configurations of the underwater oxygen dissolving device 1c are the same as those of the underwater oxygen dissolving device 1 of the first embodiment.

In the underwater oxygen dissolving apparatus 1c having such a configuration, the cylindrical tank 2, the downcomer pipe 5 and the like are added, and these are arranged immediately above the two nodes 17a. Compared with the apparatus 1, the amount of fluid 10 injected into the cylindrical tank 2 increases and the amount of bubbles 12 generated also increases. Therefore, according to the underwater oxygen dissolving apparatus 1c, the dissolved concentration of oxygen per unit time can be increased.
Other actions and effects in water dissolved oxygen apparatus 1 c is similar to the underwater oxygen dissolution apparatus 1 of the first embodiment.

Next, an underwater oxygen dissolving device according to a fourth modification of the first embodiment will be described with reference to FIG. FIG. 8 is a side view of the ultrasonic oscillator constituting the underwater oxygen dissolving device according to the fourth modification of the first embodiment when viewed from above. The components shown in FIGS. 1 to 7 are denoted by the same reference numerals in FIG. 8 and the description thereof is omitted.
As shown in FIG. 8, in the underwater oxygen dissolving device 1d according to the fourth modification of the first embodiment, the ultrasonic oscillator 9 whose long axis X is arranged along the horizontal direction H has an opening at one end surface. It accommodates in the container 20 provided with the part 20a. The container 20 is a box-shaped body having a closed surface except for the opening 20a, and is fixed to the storage tank 8 (see FIG. 1) by a support member (not shown).
Other configurations of the underwater oxygen dissolving apparatus 1d are the same as those of the underwater oxygen dissolving apparatus 1 according to the first embodiment.

In the underwater oxygen dissolving apparatus 1d having such a configuration, it is possible to suppress the propagation of ultrasonic waves in the fluid 10 (see FIG. 1) as spherical waves other than the concentrated propagation in front of the ultrasonic oscillator 9. The That is, the ultrasonic wave propagating in front of the ultrasonic oscillator 9 generates a water flow 21 a that travels straight in the container 20, and crushes the bubbles 12 a and 12 b (see FIG. 3), thereby dissolving oxygen in the fluid 10. To do.
On the other hand, the ultrasonic wave whose propagation is suppressed is reflected by the container 20 and the water surface 10b (present on the front side in the figure) after propagating as a spherical wave, and generates a water flow 21b in the container 20. Next, a water flow 21c obtained by joining a water flow 21b and a water flow (not shown) reflected by the container 20 or the like is gently diffused into the storage tank 8 through the opening 20a. Therefore, the fluid 10 containing dissolved oxygen formed due to the ultrasonic wave propagating forward is prevented from staying around the ultrasonic oscillator 9.
Therefore, according to the underwater oxygen dissolving device 1d, since the water flow 21c generated in the container 20 diffuses into the storage tank 8 through the opening 20a, the fluid 10 stored in the storage tank 8 is stirred, It is possible to make the dissolved concentration of oxygen inside the storage tank 8 uniform.
Other operations and effects of the underwater oxygen dissolving apparatus 1d are the same as those of the underwater oxygen dissolving apparatus 1 of the first embodiment.

The in-water oxygen dissolving apparatus of Example 2 which concerns on embodiment of this invention is demonstrated in detail using FIG.9 and FIG.10. FIG. 9A is a configuration diagram of the underwater oxygen dissolving apparatus according to the second embodiment, and FIG. 9B is an explanatory diagram for explaining the operation of the ultrasonic oscillator constituting the apparatus. 1 to 8 are denoted by the same reference numerals in FIG. 9 and description thereof is omitted.
As illustrated in FIG. 9A, the underwater oxygen dissolving device 22 according to the second embodiment includes an ultrasonic oscillator 23 instead of the ultrasonic oscillator 9 in the underwater oxygen dissolving device 1 according to the first embodiment. The ultrasonic oscillator 23 includes an ultrasonic transducer 23a and a horn 23b, and a second launch surface 24 (a tip surface of the horn 23a) is arranged vertically upward. The storage tank 8 is formed with a reflection surface that reflects the second incident wave emitted from the second emission surface 24 to form a second reflected wave. In addition, this reflective surface is the water surface 10b.
Further, as shown in FIG. 9B, the second launch surface 24 is formed on the water surface 10b so that the second incident wave and the second reflected wave are combined to form the second standing wave 25. are spaced L ₃ between. The second standing wave 25, like the first standing wave _{17, λ 1/4 (λ} 1 is in a fluid ultrasound emitted from the ultrasonic generator 23 is stored inside the reservoir 8 Each time, the node 25a and the antinode 25b are repeatedly formed. However, like the water dissolved oxygen apparatus 1, depending on the spacing L _3, without the second standing wave is formed, the bubbles 12a, 12b, etc. are fully collapsed.
Further, the ultrasonic oscillator 23 is accommodated in the storage container 14 b, and a plate-like vibrating body 26 is covered on the second launch surface 24. The vibrating body 26 forms the upper surface of the storage container 14 b and is installed in parallel to the second launching surface 24.
In order to resonate the vibrating body 26 efficiently, it is desirable that the second launch surface 24 and the plate-like vibrating body 26 are in surface contact.
Other configurations of the underwater oxygen dissolving device 22 are the same as those of the underwater oxygen dissolving device 1 of the first embodiment.

In the underwater oxygen dissolving device 22 having such a configuration, when the fluid 10 dropped from the downcomer pipe 5 is introduced into the position of the node 25a, the bubbles generated by the cavitation and the bubbles 12a and 12b are efficiently crushed. Furthermore, when the vibrating body 26 resonates at the frequency of the ultrasonic wave emitted from the second emission surface 24 of the ultrasonic oscillator 23, the amplitude of the ultrasonic wave increases and the pressure increases.
Therefore, according to the underwater oxygen dissolving device 22, more bubbles 12a, 12b, etc. can be reliably crushed with less input energy. That is, the power consumption of the ultrasonic oscillator 23 can be reduced, and the dissolved concentration of oxygen in the fluid 10 can be further improved.
Other operations and effects of the underwater oxygen dissolving device 22 are the same as those of the underwater oxygen dissolving device 1 of the first embodiment.

Subsequently, an underwater oxygen dissolving apparatus according to a modification of the second embodiment will be described in detail with reference to FIG. FIG. 10 is a side view of an ultrasonic oscillator constituting an underwater oxygen dissolving device according to a modification of the second embodiment. In addition, about the component shown in FIG. 1 thru | or FIG. 9, the same code | symbol is attached | subjected also in FIG. 10, and the description is abbreviate | omitted.
As shown in FIG. 10, the underwater oxygen dissolving device 22a according to the modification of the second embodiment is the same as the underwater oxygen dissolving device 22 of the second embodiment, in which the vibrating body 26 is omitted and the ultrasonic oscillator 23 has both end surfaces. Are accommodated in a cylindrical container 27 having openings 27a and 27b, respectively. The container 27 is fixed to the storage tank 8 (see FIG. 1) by a support member (not shown).
Other configurations of the underwater oxygen dissolving device 22a are the same as those of the underwater oxygen dissolving device 1 of the first embodiment.

In the underwater oxygen dissolving device 22a having such a configuration, the water flow 21b and the water flow 21c obtained by joining the water flow 21a (not shown) reflected by the container 27 and the water surface 10b are combined into the storage tank via the opening 27b. Slowly diffuses into 8.
Therefore, according to the underwater oxygen dissolving device 22a, the fluid 10 stored in the storage tank 8 is agitated, and the dissolved concentration of oxygen inside the storage tank 8 can be made uniform.
Other operations and effects of the underwater oxygen dissolving device 22a are the same as those of the underwater oxygen dissolving device 1 of the first embodiment.

Then, the oxygen dissolution method in water of Example 3 which concerns on embodiment of this invention is demonstrated in detail using FIG. FIG. 11 is a process diagram of the underwater oxygen dissolving method according to the third embodiment. In addition, about the component shown in FIG. 1 thru | or FIG. 10, the same code | symbol is attached | subjected also in FIG. 11, and the description is abbreviate | omitted.
As shown in FIG. 11, the underwater oxygen dissolution method 28 according to the third embodiment includes a vortex formation process in step S1, a bubble formation process in step S2, a storage process in step S3, and a bubble collapse process in step S4. . In addition, the code | symbol shown in a present Example means the code | symbol shown in FIG. 1 thru | or FIG. 10, respectively.
The vortex forming process of step S1 is a process in which the falling hole 2a is provided in the bottom 2b of the cylindrical tank 2 so that the fluid 10 injected into the inside is formed as a vortex 11.
In this step, the vortex 11 is formed inside the cylindrical tank 2 to form the bubbles 12a. Furthermore, this process acts as a preparation process for sucking air into the fluid 10 in the bubble forming process of step S2.
Therefore, according to this process, since the bubble 12a can be formed without using power equipment such as rotating blades, labor saving can be achieved.

In the bubble forming process of step S2, the upper end 3a communicates with the drop hole 2a and the side wall 2c has a plurality of intake holes 6 formed therein, and the inner tube 3 provided around the inner tube 3 When passing through the inner tube 3 in a cylindrical downcomer pipe 5 comprising an outer tube 4 provided with an air inflow means 7 for forming a closed space 13 therebetween and air flowing into the closed space 13. In this process, air is sucked into the fluid 10 from the periphery of the vortex 11 through the air inflow means 7 and the plurality of intake holes 6, and bubbles 12 b are formed in the fluid 10.
In this step, when the fluid 10 passes downward through the inner tube 3, air is sucked into the vortex 11 to form bubbles 12 b and oxygen is dissolved on the inner surface of the vortex 11.
Therefore, according to this step, the bubbles 12b can be efficiently formed in the fluid 10.

The storage step in step S3 is a step in which the fluid 10 in which the bubbles 12a and 12b are formed falls and is stored in the storage tank 8.
In this step, the bubbles 12 a and 12 b move to the inside of the storage tank 8, and oxygen is dissolved in the fluid 10 by disturbing the water surface 10 b of the stored fluid 10.
Therefore, according to this step, it is possible to irradiate the bubbles formed by cavitation in the fluid 10 and the bubbles 12 a and 12 b with the ultrasonic waves from the ultrasonic oscillator 9 and before irradiating the ultrasonic waves from the ultrasonic oscillator 9. Also in this case, the dissolved concentration of oxygen can be increased.

In the bubble crushing step in step S4, ultrasonic waves are emitted from the ultrasonic oscillator 9 immersed in the storage tank 8 toward the fluid 10 stored in the storage tank 8 and formed with bubbles 12a, 12b and the like. In this step, the bubbles 12a, 12b and the like are crushed.
In this step, the bubbles 12a, 12b and the like are efficiently crushed by cavitation using ultrasonic waves, so that oxygen is dissolved in the fluid 10 stored in the storage tank 8.
Therefore, according to this process, since the dissolved concentration of oxygen can be dramatically increased, harmful substances and the like in the fluid 10 can be reliably decomposed.

  As described above, according to the underwater oxygen dissolving method 28 according to the third embodiment, the same effects as those of the underwater oxygen dissolving device 1 according to the first embodiment can be exhibited.

In addition, the structure of the underwater oxygen dissolution apparatus 1-1d of this invention is not limited to what is shown in an Example. For example, in the underwater oxygen dissolving apparatus 1, the ultrasonic oscillator 9 and the side wall 8 b of the storage tank 8 may be arranged so that the first standing wave 17 is not generated. Further, in the underwater oxygen dissolving apparatus 1c, a cylindrical tank 2, a downcomer pipe 5 and the like may be further added. Furthermore, a vibrating body 26 may be provided on the first launch surface 15 of the ultrasonic oscillators 9 and 19.
Further, in the underwater oxygen dissolving apparatus 22, the ultrasonic oscillator 23 may be added and the vibrator 26 may be omitted. Further, as a second standing wave 25 does not occur, the interval L ₃ between the ultrasonic oscillator 23 and the water surface 10b may be adjusted. Then, in the bubble crushing step in step S4 of the underwater oxygen dissolution method 28, the ultrasonic waves emitted from the ultrasonic oscillator 9 may be continuously emitted or emitted in a pulse shape at a desired timing.

  The present invention is intended to increase the concentration of oxygen dissolved in water for the purpose of breeding ornamental aquatic organisms, aquaculture of research / commercial organisms, or for the purpose of improving water quality in closed areas such as purification facilities and lakes. It can also be used as an underwater oxygen dissolving apparatus and an underwater oxygen dissolving method used therefor.

DESCRIPTION OF SYMBOLS 1, 1a-1d ... Underwater oxygen dissolution apparatus 2 ... Cylindrical tank 2a ... Falling hole 2b ... Bottom part 2c ... Side wall 2d ... Upper opening part 3 ... Inner pipe 3a ... Upper end 3b ... Side wall 4 ... Outer pipe 5 ... Downcomer pipe 6 ... Intake Hole 7 ... Air inflow means 8 ... Storage tanks 8a, 8b ... Side wall 9 ... Ultrasonic oscillator 9a ... Ultrasonic vibrator 9b ... Horn 10 ... Fluid 10a ... Indent 10b ... Water surface 11 ... Vortex 11a ... Downflow 11b ... Rotating flow 11c ... small vortex 12 to 12c ... bubble 13 ... enclosed space 14 and 14b ... containment container 14a ... flange 15 ... first launch surface 16 ... reflector 17 ... first standing wave 17a ... node 17b ... belly 18 ... projection 19 ... ultrasonic oscillator 19a ... horn 20 ... container 20a ... openings 21a to 21c ... water flow 22, 22a ... underwater oxygen dissolving device 23 ... ultrasonic oscillator 23a ... ultrasonic transducer 23b ... horn 24 ... second launch surface 25 ... second standing wave 5a ... section 25b ... antinode 26 ... vibrating body 27 ... container 27a, 27b ... opening 28 ... water oxygen dissolution method

Claims (6)

The drop hole (2a) is provided in the bottom (2b), so that the fluid (10) injected by natural fall into the inside of the drop hole (2a) circulates above the drop hole (2a). A cylindrical tank (2) that flows into and forms a vortex (11);
A straight pipe type inner pipe (3) having an upper end (3a) communicating with the drop hole (2a) and a plurality of intake holes (6) formed in the side wall (3b), and the inner pipe (3 ) And an outer pipe (4) provided with an air inflow means (7) for forming a closed space (13) with the inner pipe (3) and flowing air into the closed space (13). When the air passes through the inner pipe (3), air flows from the periphery of the vortex (11) to the fluid (10) via the air inflow means (7) and the plurality of intake holes (6). A cylindrical downcomer pipe (5) in which bubbles (12) are formed in the fluid (10),
A box-shaped storage tank (8) that is disposed vertically below the downcomer pipe (5) and in which the fluid (10) in which the bubbles (12) are formed is dropped and stored;
An ultrasonic oscillator in which the bubbles (12) are crushed by being immersed in the storage tank (8) and firing the ultrasonic waves toward the fluid (10) stored in the storage tank (8). and (9), with a,
The plurality of intake holes (6) are drilled at a first interval around the center of the cylindrical tank (2) and the downcomer pipe (5), and the length of the inner pipe (3) A plurality of stages are provided along the direction with a second interval,
The fluid (10) that has fallen into the storage tank (8) is stored in the storage tank (8) such that the water surface (10b) has a third interval vertically downward from the downcomer pipe (5). As a result, turbulence occurs due to the drop of the fluid (10) on the water surface (10b), and oxygen is dissolved from the surrounding air in the fluid (10) stored in the storage tank (8). water dissolved oxygen and wherein the that (1). The ultrasonic oscillator (9) has its long axis arranged along the horizontal direction,
The storage tank (8) has a first ultrasonic wave (hereinafter referred to as a first incident) emitted from a first emission surface (15) of the ultrasonic oscillator (9) on the wall surface (8b) or inside thereof. And a reflector (16) that reflects a wave to form a first reflected wave,
The reflector (16) has the first launch surface (15) such that the first incident wave and the first reflected wave are combined to form a first standing wave (17). The oxygen-dissolving device (1a) in water according to claim 1, wherein the oxygen-dissolving device (1a) is arranged with a space between the water-dissolving device and the water-dissolving device. The ultrasonic oscillator (19) has a second launch surface (24) arranged vertically upward,
The storage tank (8) reflects a second ultrasonic wave (hereinafter referred to as a second incident wave) emitted from the second emission surface (24) to form a second reflected wave. A surface is formed,
The second launch surface (24) is spaced from the reflective surface so that the second incident wave and the second reflected wave are combined to form a second standing wave (25). The apparatus for dissolving oxygen in water (22) according to claim 1, wherein the oxygen dissolving apparatus (22) is arranged with a gap in between.   The said ultrasonic oscillator (9, 23) is accommodated in the accommodating body (20, 27) provided with an opening part in at least one end surface, The any one of Claims 1 thru | or 3 characterized by the above-mentioned. In-water oxygen dissolution apparatus (1d, 22a).   The underwater oxygen dissolving device (1) according to any one of claims 1 to 4, wherein the ultrasonic oscillator (9, 23) is provided with a vibrating body (26) on a launch surface thereof. , 22). A drop hole is provided at the bottom of the cylindrical tank, so that the fluid injected by natural fall flows into the drop hole while circulating around the drop hole, and forms a vortex. Step (S1);
A closed space is formed between a straight pipe-type inner pipe whose upper end communicates with the drop hole and a plurality of intake holes are formed in the side wall, and the inner pipe provided around the inner pipe. And a cylindrical downcomer pipe having an air inflow means for injecting air into the closed space, and when passing through the inner pipe, the air inflow through the air inflow means and the plurality of intake holes. Is bubbled into the fluid from the periphery of the vortex and bubbles are formed in the fluid (S2),
A storage step (S3) in which the fluid in which the bubbles are formed falls and is stored in a storage tank;
Bubble destruction by which the bubbles are crushed by the ultrasonic wave being emitted from the ultrasonic oscillator immersed in the storage tank toward the fluid in which the bubbles stored in the storage tank are formed. A step (S4) ,
The plurality of intake holes are formed with a first interval around the center of the cylindrical tank and the downcomer pipe, and with a second interval along the longitudinal direction of the inner tube. Multiple stages are provided,
The fluid that has fallen into the storage tank is stored in the storage tank so that the water surface thereof is spaced apart from the downcomer pipe vertically downward by a third distance, so that the fluid is disturbed by the drop of the fluid. And oxygen is melt | dissolved in the said fluid stored in the said storage tank from the said surrounding air, The oxygen dissolution method in water characterized by the above-mentioned .

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