JP5672472B2 - Fine bubble forming device. - Google Patents

Fine bubble forming device. Download PDF

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Publication number
JP5672472B2
JP5672472B2 JP2010077138A JP2010077138A JP5672472B2 JP 5672472 B2 JP5672472 B2 JP 5672472B2 JP 2010077138 A JP2010077138 A JP 2010077138A JP 2010077138 A JP2010077138 A JP 2010077138A JP 5672472 B2 JP5672472 B2 JP 5672472B2
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liquid
gas
bubble
means
tank
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JP2011206689A (en
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敏彦 社河内
敏彦 社河内
信一 上田
信一 上田
重信 吉川
重信 吉川
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国立大学法人三重大学
信一 上田
信一 上田
株式会社吉川製作所
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Description

  The present invention relates to a method and an apparatus for producing water containing fine bubbles, which are mainly used for bathtubs, showers, or cleaning applications, but also relates to a hydrogen addition apparatus that makes liquid gas into fine bubbles and mixes them with liquid fuel.

Prior art on microbubble generators includes the following.
Patent Document 1 discloses an invention of a microbubble / carbonated spring generator provided with a gas-liquid mixing tank in which carbon dioxide gas or air is dissolved and mixed in warm water as microbubbles.
In Patent Document 2, in consideration of the amount of dissolved air determined by the water temperature, the discharge pressure of the pump 1 is set so as to maintain the pressure at which all of the air sucked from the orifice fixed valve 7 is dissolved in the water in the gas-liquid mixing tank. An invention is disclosed in which excessive air is prevented from being discharged into the bathtub or the like by setting and controlling.
Patent Document 3 discloses an ejector-type micro-bubble generator installed in the middle of a circulation path for circulating water in a storage tank through an external circulation path.

Patent Document 4 discloses an ejector-type microbubble generator having a bubble crushing unit that draws gas from a gas suction port of an ejector unit, mixes the gas in circulating water, and further crushes the mixed gas.
Patent Document 5 discloses an invention of a plate provided with a large number of inclined holes for generating a swirling flow, and is said to have an effect of further miniaturizing microbubbles.
Patent Document 6 is an invention of one of the inventors of the present application, and discloses an invention of a gas-liquid two-phase microbubble generator in which a water jet nozzle is formed in an orifice shape and a gas nozzle is arranged in the vicinity thereof.

JP2008-1114099 JP2007-289903 JP 2006-167612 A JP 2006-212562 A JP2008-0868868 JP 2006-212562 A

It is known that in a bath in which carbon dioxide gas is microbubbled and mixed with hot water to make it cloudy, carbon dioxide gas enhances the warm bath effect and promotes blood circulation, and is effective for fatigue, stiff shoulders, coldness and the like.
In the invention of Patent Document 1 in which carbon dioxide gas is converted into microbubbles, a water jet nozzle and a jet part of a carbon dioxide gas jet nozzle are connected to a sealed container, and the inside of the sealed container is agitated and mixed by the jet effect, so that carbon dioxide and air It is said that the part is dissolved in water, and the remaining gas part is microbubbled by the stirring effect.
However, it is difficult to think that the gas can be microbubbled only by the jetting effect of the jet nozzle, and there is a strong possibility that large bubbles are released into the bathtub. Carbon dioxide released as large bubbles does not have a warm bath effect, but rather hinders comfortable bathing.

Further, in the invention of Patent Document 1, a water level detection sensor is arranged in a sealed container and the gas volume in the container is maintained within a predetermined range, but it is difficult to grasp the ratio of carbon dioxide to air. In an extreme case, when all the gas in the sealed container becomes air, the supply of carbon dioxide gas may continue to be shut off.
The problems of the present invention are the following two points.
First problem: When large-sized bubbles are included in the liquid returning to the reservoir, a sudden phenomenon occurs. All the bubbles contained in the liquid are converted into micro bubbles (fine bubbles), and it is necessary to remove large-sized bubbles.
Second problem: When a gas other than air is used by using a gas cylinder or the like, the amount of gas released unnecessarily without being microbubbled is reduced.

The fine bubble forming apparatus according to claim 1 is installed in a storage tank, a circulation path, a circulation pump, a pressure adjustment tank, a pressure adjustment member, and a pressure adjustment tank, and detects a liquid level lower limit of the pressure adjustment tank. A sensor ,
It is comprised from a gas supply means and a bubble formation means.
Here, the storage tank stores a liquid, and the circulation path is a series of piping paths for returning the liquid once discharged from the storage tank to the storage tank again. Further, the gas supply means into the liquid may be installed at any location upstream of the circulation pump or downstream of the circulation pump, and the intake method may be any method such as an ejector method using a suction nozzle or press-fitting with a high-pressure gas cylinder. There may be.
In addition, a bubble forming means is provided in the middle of the circulation path, but the bubble forming means may be integrated with the gas supply means or may be separated. The bubble forming means mixes bubbles in the circulating liquid, and the liquid mixed with bubbles returns to the storage tank.

Further, the bubble refining means may include a pressurizing method. In the case of pressurization, the gas is not mixed as bubbles but dissolved in the liquid. The dissolved bubbles are depressurized in the course of reaching the storage tank, and are precipitated in the liquid as fine bubbles to form fine bubbles.
The present invention is the above microbubble forming apparatus, at least a pressurized liquid pump in the middle of the circulation path,
A pressure adjusting tank, a first bubble refining means, a second bubble refining means, and a third bubble refining means are disposed.
In addition, an internal pressure adjusting member such as a pipe resistance adjusting valve is attached to the pressure adjusting tank, and the pressure in the tank can be increased to the pressurization limit of the pressurized liquid pump. Therefore, when the liquid stored in the storage tank is sucked with a pressure pump, the internal pressure is increased to the set pressure of the pressure adjusting member arranged on the discharge side, the gas is dissolved in the liquid, and the liquid is returned to the storage tank again. By reducing the pressure to the internal pressure of the storage tank, fine bubbles can be deposited in the liquid.

The pressure adjustment tank is used to adjust the pressure of bubbles in the liquid pumped by a pressurized liquid pump when the bubbles are enlarged by contact fusion between the bubbles during pumping or when the bubbles are large at the time of intake. Float in the tank and collect as gas in the upper space. Moreover, the 1st bubble refinement | miniaturization means is installed in the pressure control tank upper part, and the collect | recovered gas is mixed in a liquid again as a fine bubble. The pressure adjustment tank has a function of separating large-sized bubbles from the liquid, and the liquid delivered from the pressure adjustment tank contains only fine bubbles.
The third bubble refining means is a bubble refining device having an orifice, and is a pressure adjusting tank.
The circulating liquid pressure delivered from the tank is reduced to the storage tank pressure, and is contained in the circulating liquid.
The fine bubbles are further sheared to be refined and discharged into the storage tank.
At this time, the gas dissolved in the liquid in the pressure adjusting tank is precipitated as fine bubbles due to the decompression effect.
The microbubbles refined by the cutting effect are mixed and released into the storage tank.

The bubble refining means defined as the first bubble refining means is an ejector having a suction nozzle, and the suction port of the suction nozzle is opened at the upper part of the pressure adjusting tank.
Therefore, the ejector sequentially sucks the gas present in the upper space of the pressure adjustment tank, turns it into fine bubbles,
It can be reliably mixed in the liquid.
In addition, since the liquid that has passed through the pressure adjustment section of the pressure adjustment tank is depressurized to substantially the same pressure as the liquid in the storage tank, the dissolved gas is precipitated in the liquid as fine bubbles, forming fine bubbles. . Therefore,
The liquid delivered to the storage tank includes two types of fine bubbles formed by the first bubble refining means and fine bubbles precipitated during the decompression process.

Moreover, the fine bubble forming apparatus according to claim 1 is a second device as a gas intake means into the liquid.
Use bubble miniaturization means. The second bubble refining means is installed upstream of the pressurized liquid pump, mixes the gas sucked by the suction nozzle into the circulating liquid, and shears and refines the sucked gas by the orifice structure. The configuration of the present invention may be the same as the microbubble generating nozzle described in Japanese Patent Application Laid-Open No. 2006-212562, or may be any known ejector mechanism, and the target liquid is not limited to water, and microbubbles are mixed. If it is a target liquid, water, heavy oil fuel, etc. are all targets. Furthermore, the gas is not limited to air, and any gas that needs to be mixed with a liquid such as carbon dioxide or hydrogen is a target.
Since the gas supplied to the circulating liquid according to the present invention is sufficiently refined at the time of introduction into the liquid,
When it is sent into the pressure adjusting tank located downstream of the pressurized liquid pump, the amount of gas floating in the upper space can be minimized.
Further, the gas-liquid contact area is expanded by the effect of refining the bubbles, and the gas dissolution process in the liquid by the pressurizing effect of the pressurized liquid pump can be smoothly advanced.

The invention described in claim 2 A fine bubble forming apparatus according to claim 1, wherein the liquid is a water, wherein the gas is carbon dioxide or air.
The use in which carbon dioxide gas is made into fine bubbles and mixed in water is suitable for a bath, for example. Moreover, as a method of making air finer and mixing it into water, it is suitable for washing applications other than baths.

The invention described in claim 3 A fine bubble forming apparatus according to claim 1, wherein the liquid is a fuel for tones and heavy oil, characterized in that said gas is hydrogen gas.
For example, in emulsion fuel, water is mixed into heavy oil at a constant rate, but when the mixing rate of water is large, there may be an improvement effect in fuel efficiency, exhaust gas, etc., but ignitability may be lacking. In this case, ignitability is promoted by mixing hydrogen gas into microbubbles, and the problem of ignitability caused by increasing the mixing ratio of water can be overcome.
The present invention can be suitably used in the field of emulsion fuel.

According to the present invention, the following measures can be taken for each of the two problems existing in the prior art.
(1) About the first problem In the fine bubble forming apparatus of the present invention, there is at least a first bubble refinement means, and the gas is refined and mixed into the liquid. Even if there are large-sized bubbles that are not miniaturized, the large-sized bubbles are sent to the pressure adjustment tank, and during the stay in the pressure adjustment tank, they are easily separated and floated from the liquid and released into the upper space of the reservoir. Is done. Since the gas released into the upper space is refined again by the first bubble refinement means and mixed in the liquid, all the bubbles contained in the refluxing liquid are converted into microbubbles (fine bubbles). Since there is no large-sized bubble, the sudden phenomenon is avoided and the first problem is solved.
In addition, in addition to the 1st bubble refinement | miniaturization means, the refinement | miniaturization of a bubble is further accelerated | stimulated by using together a 2nd bubble refinement | miniaturization means and a 3rd bubble refinement | miniaturization means.

(2) Regarding the second problem, even if carbon dioxide gas or hydrogen, which is a gas other than air, is used, or even if the liquid used is an emulsion fuel based on, for example, heavy oil other than water, The same. Further, in the present invention, large bubbles present in the liquid are separated and collected in the pressure adjusting tank and returned to the liquid again as refined bubbles, so that there is no uselessly released gas and the second problem is solved. .

The basic block diagram of the fine bubble formation apparatus provided with the 1st, 2 bubble refinement | miniaturization means. The basic block diagram of the fine bubble formation apparatus provided with the 1st, 2nd, 3rd bubble refinement | miniaturization means. R type fine bubble generating nozzle used as first and second bubble refining means. S type fine bubble generating nozzle used as first and second bubble refining means. A type fine bubble generating nozzle used as third bubble refining means. B type fine bubble generating nozzle used as third bubble refinement means. A C-type fine bubble generating nozzle used as third bubble refinement means. A D-type fine bubble generating nozzle used as third bubble refinement means. E type fine bubble generating nozzle used as third bubble refinement means. F type fine bubble generating nozzle used as third bubble refinement means. Evaluation method of micro bubble generation amount by illuminance measurement.

A first embodiment of a fine bubble forming apparatus according to the present invention will be described with reference to FIG.
The liquid 9 is stored in the storage tank 6, and the liquid is sucked by the pressurized liquid pump 7 via the circulation path 8a. The sucked liquid is sucked from the suction nozzle 22 by the second bubble refining means 2 before reaching the pressurized liquid pump 7, and the sucked gas is made into fine bubbles and mixed into the liquid.
The liquid in the gas-liquid mixed state is sucked into the pressurized liquid pump 7 via the circulation path 8b. The pressurized liquid pump 7 is a rotary type pump that generates a protruding pressure corresponding to the pipe line resistance on the discharge side. The liquid delivered in a pressurized state by the pressurized liquid pump 7 reaches the first bubble refining means 1 via the circulation path 8c.

The intake part of the intake pipe 22 of the first bubble refining means 1 is opened to the upper space of the pressure adjustment tank 4, and the liquid delivery port is also opened to the upper part of the pressure adjustment tank 4. The first bubble refining means 1 sucks the gas staying in the upper space of the pressure adjusting tank 4 through the intake pipe 22 and makes it finely mixed in the gas-liquid mixed liquid fed in the circulation path 8c. The gas-liquid mixed liquid is ejected from the outlet of the first bubble miniaturizing means 1 into the pressure adjusting tank 4. Since the inside of the pressure adjusting tank 4 is maintained at a high pressure corresponding to the delivery pressure of the pressurized liquid pump 7, a part of the gas is dissolved in the liquid in the circulation path 8 c and the pressure adjusting tank 4.

The liquid that has become a mixture of gas and liquid stays in the pressure adjustment tank 4 for a certain period of time. The residence time is determined by the volume of the pressure adjusting tank 4, the space volume formed in the upper part, the flow rate of the liquid, and the like. At this time, the microbubbles are mixed in the gas and liquid by the stirring effect of the liquid sent out from the first bubble miniaturizing means 1 and circulate in the pressure adjusting tank 4. It floats on the surface and is released into the upper space. Therefore, the bubbles contained in the liquid flowing out to the internal pressure adjusting member 5 are only fine bubbles.
The internal pressure adjusting member 5 is, for example, a valve, and narrows the liquid flow path to increase the flow resistance, thereby increasing the internal pressure of the pressure adjusting tank 4 or conversely expanding the liquid flow path to reduce the flow resistance. Then, the pressure inside the pressure adjusting tank 4 can be lowered.

The gas-liquid mixed liquid that has passed through the internal pressure adjusting member 5 is depressurized to the same pressure as the liquid 9 inside the storage tank 6 at once when the instantaneous internal pressure flows out into the circulation path 8d. At this time, the gas dissolved in the liquid also becomes fine bubbles and precipitates in the liquid. In the liquid discharged from the circulation path 8d to the storage tank 6, the fine bubbles mixed in the liquid by the first and second bubble refining means are pressurized and dissolved by the pressurized liquid pump, and then the pressure is reduced. The fine bubbles deposited from are mixed together.

Here, the detail of the 1st, 2nd bubble refinement | miniaturization means is demonstrated.
3 and 4 show the structure of these bubble refining means. There is no functional difference between the first and second bubble refining means.
First, the configuration of the S type nozzle of FIG. 3 will be described.
The S type nozzle is composed of a main body 30 and a cap 31, and a flow path 21 is provided at the center of the main body 30, and the liquid flows in the direction of the arrow (from left to right in the drawing). The cross-sectional area of the liquid channel changes along the channel, and the flow velocity inside the main body also changes corresponding to the cross-sectional area. Specifically, the liquid flowing into the flow path 21 is suddenly narrowed by the orifice 23 and then reaches the enlarged flow path region 24. At this time, since the portion where the intake pipe 22 opens inside the nozzle becomes negative pressure, gas is sucked from the intake pipe 22. The suction gas is sheared by the liquid flowing at high speed to become fine bubbles, and is mixed with the liquid and sent out from the discharge port 25.

Next, the configuration of the R type nozzle will be described with reference to FIG.
The R type nozzle is composed of a main body 30 and a cap 31, and a flow path 21 is provided at the center of the main body 30 so that the liquid flows in the direction of the arrow (from left to right in the drawing). As for the R type nozzle, the inner diameter of the internal flow path changes more complicatedly than the S type nozzle, and the flow velocity inside the main body changes corresponding to the cross-sectional area along the flow path.
First, in the intake passage 27 connected to the left end inflow passage 21, the flow passage cross-sectional area is abruptly narrowed and reaches the intermediate flow passage 26 to be enlarged. An orifice 23 is provided at the distal end of the intermediate flow path 26, and the flow path is sequentially expanded at the tip of the orifice to reach the expanded flow path 24. The tip of the enlarged flow path is a jet outlet 25, and the liquid is delivered from the jet outlet.
The portion of the intake flow path 27 has the fastest flow velocity, and the opening of the intake pipe connected to this portion has a negative pressure, and gas is sucked from the outside through the intake pipe 22. The sucked gas is sheared by the high-speed fluid passing through the orifice portion, and is sent out from the jet outlet 25 as fine bubbles.

Although not shown in FIG. 1, a sensor (for example , the liquid level lower limit detection sensor 41 shown in FIG. 2 or a float) capable of detecting the lower limit of the liquid level is arranged in the pressure adjusting tank 4, and the liquid amount exceeds the limit. The amount of gas sucked by the second bubble refining means can be limited when the upper space volume is expanded beyond the limit. Conversely, the space above the pressure adjustment tank 4 may be filled with liquid. In this case, the intake pipe 22 sucks the liquid in the pressure adjusting tank 4, but no functional problem occurs even if the intake pipe 22 sucks the liquid.

Next, a second configuration example will be described with reference to FIG.
The basic configuration of FIG. 2 is the same as that of FIG. 1, except that the third bubble refinement means 3 is installed at the tip of the circulation path 8d, and the tip of the bubble refinement means is opened to the storage tank 6. It is a point.
In FIG. 2, since the third bubble refining means 3 is additionally installed, the fine bubbles in the liquid are further refined.
A representative example of the third bubble refining means 3 is shown in FIG.

The A type nozzle of FIG. 5 is composed of a main body 11, a cap 14, a spiral flow plate 15, and a mesh 16. A flow path having a circular cross section is provided at the center of the main body 11, and the liquid is in the direction of the arrow (from the left in the drawing). To the right). The flow path cross-sectional area inside the main body varies in various directions along the flow direction, and the flow velocity inside the main body changes corresponding to the cross-sectional area.
First, the liquid flowing in from the left is changed to a swirl flow by the spiral plate 15. Due to this swirl effect, the bubbles receive a shearing force and become finer. The flow reaches the orifice 12 while swirling the flow path having the inner diameter D1. In the orifice portion, the flow path is rapidly narrowed and the flow velocity is increased. After passing through the orifice, the flow path cross section is gently expanded to the maximum inner diameter D2. In the orifice portion, the flow velocity gradient in the inner diameter direction is large, and a large shearing force acts on the bubbles existing in the liquid, so that the fine bubbles existing in the liquid are further miniaturized. After passing through the orifice, the fluid reaches the mesh 16. Since the flow velocity at the time of passing through the mesh changes locally, a shearing force acts on the bubbles in this case as well, and the miniaturization is further promoted. Since the inner diameter of the opening of the cap 14 to the storage tank 6 is narrowed to D3, the liquid contains fine bubbles and is vigorously radiated to the storage tank 6 in a gas-liquid mixed state.

In the system configuration shown in FIG. 1, water was used as a liquid, and an experiment was performed to generate air microbubbles in water. The outline of the experimental equipment specifications is as follows.
The main dimensions of the apparatus used for the experiment are as follows.
<Nozzle>
D1: 9mm D2: 18mm D3: 6mm D4: 2mm
L1: 14mm L2: 15mm L3: 65mm
<Pressure adjustment tank>
Inner diameter: 70 mm Height: 150 mm
<Reservoir>
600x300x360mm
<Pressurized liquid pump>
Rotary pump 24V, 50W
<Piping>
Inner diameter: 12mm Outer diameter: 18mm

In Example 1, the microbubble size when the apparatus was operated under the following two conditions and the change in the space volume of the pressure adjusting tank were visually observed.
Condition 1: The first bubble refining means 1 is operated for 5 minutes under normal conditions (the intake pipe 22 is “open”).
Condition 2: Operation is performed for 5 minutes with the intake pipe 22 of the first bubble refining means 1 closed.
As a result, the following differences were recognized qualitatively.
(1) The microbubbles formed under the condition 1 have a smaller particle size than the microbubbles formed under the condition 2, and the residence time in water is long.
(2) In condition 1, a situation is observed in which the gas in the pressure adjusting tank is sucked in a bubble shape through the intake pipe, and the gas ratio in the pressure adjusting layer is smaller than in condition 2.
According to this experiment, large-sized bubbles are floated and separated in the pressure adjusting tank, and these bubbles stay in the upper space, are sucked into the intake pipe of the first bubble refining means, become microbubbles, and are mixed into the water again. Therefore, it was confirmed that the refinement of bubbles was further promoted.
Thereby, the effectiveness of the gas separation function of the pressure adjusting tank according to claim 1 of the present invention and the effect of the gas suction from the pressure adjusting tank of the first bubble refining means according to claim 2 was confirmed.

With respect to the third bubble refining means in the system configuration of FIG. 2, nozzles of various shapes were created and the microbubble generation characteristics were evaluated.
In the experiment, six types of nozzles shown in FIGS. 5 to 10 were prepared and evaluated. The characteristics of the six types of nozzle configurations are as follows.
A type nozzle (FIG. 5): Mounts both the spiral flow plate 15 and the mesh 16 B type nozzle (FIG. 6): Mounts only the spiral flow plate 15
C type nozzle (FIG. 7): Neither spiral flow plate 15 nor mesh 16 is mounted D type nozzle (FIG. 8): The configuration is the same as the A type nozzle, but the flowing water direction is the reverse E type nozzle (FIG. 9) : The configuration is the same as the B type nozzle, but the flowing water direction is the reverse F type nozzle (FIG. 10): The configuration is the same as the C type nozzle, but the flowing water direction is reversed.

The amount of microbubbles generated was measured by a method shown in FIG. 11 using an illuminometer.
The above-described six types of nozzles A to F are sequentially attached to the third bubble refining means 3 arranged at the lower part of the storage tank 6. In addition, it irradiates with the light source 36 (halogen lamp: E17 miniref electric bulb 100V.40W) from the right side of the storage tank 6, and the illuminance meter 35 (Minolta digital illuminance meter T11) is arrange | positioned in the position which opposes the storage tank 6. . Since the experiment blocks light from the surrounding environment and turns on the light source in the dark state, the illuminometer detects only the light from the light source 36 that passes through the storage tank 6. Therefore, when bubbles are created by the third bubble refining means 3 disposed in the storage tank 6, the transmitted light is scattered by the bubbles, and the amount of light detected by the illuminometer is reduced.
Since the reduction of the amount of transmitted light seems to be almost proportional to the amount of microbubbles generated, it was considered that the amount of generated microbubbles can be evaluated by measuring the amount of transmitted light (illuminance) using an illuminometer.
The results of measuring the illuminance 3 minutes after the generation of microbubbles for the six types of nozzles A to F were as follows. The measurement result is expressed as a relative value with the illuminance before the generation of microbubbles as 100%.
A type: 7% D type: 2%
B type: 10% E type: 5%
C type: 14% F type: 9%
The microbubble generation efficiency was highest for D type, followed by E type and A type, and finally C type. From this, the mesh 16 and the spiral plate 15 effectively act to generate microbubbles,
In addition, it was confirmed that the microbubbles are generated more efficiently when the nozzle is directed toward the upstream side rather than the cap portion at the downstream side of the water flow.

  The fine bubble forming apparatus according to the present invention can be applied to both business use and home use including a shower as a bath facility. Further, it is suitable for cleaning use such as appliances and parts in production factories, and can be applied to household dishwashing, washing, and commercial washing machines. Furthermore, it can be effectively applied to reforming the ignition characteristics of emulsion fuel by adding hydrogen gas to the emulsion fuel.

1 1st bubble refinement means 2 2nd bubble refinement means
3 Third bubble refining means 4 Pressure adjusting tank 5 Internal pressure adjusting member 6 Storage tank 7 Pressurized liquid pump 8a, 8b, 8c, 8d Circulating path 9 Liquid
10 Fine bubbles 11 Nozzle body 12 Orifice
14 cap 15 spiral flow plate 16 mesh 22 intake pipe 23 orifice
30 nozzle body
31 cap 35 illuminance meter 36 light source 41 liquid level lower limit detection sensor

Claims (3)

  1. A storage tank, a circulation path for circulating the liquid stored in the storage tank through an external path, a gas supply means installed in the circulation path, and a bubble miniaturization that mixes gas into a fine bubble A fine bubble forming device for supplying bubbles to the storage tank, comprising:
    At least a pressurized liquid pump, a pressure adjustment tank, a pressure adjustment member, a liquid level lower limit detection sensor for the pressure adjustment tank, a first bubble refinement means, a second bubble refinement means, and a third bubble refinement. And means for
    The second bubble refining means is installed upstream of the pressurized liquid pump, and has an ejector structure having a suction nozzle and an orifice structure, and the gas sucked by the suction nozzle is mixed into the circulating liquid, The suctioned gas is sheared and refined,
    The pressure adjustment tank floats large bubbles contained in the liquid, and is recovered as a gas in the upper space inside the pressure adjustment tank,
    The pressure adjusting member adjusts the internal pressure of the pressure adjusting tank;
    The first bubble miniaturization means has an ejector structure having a suction nozzle and an orifice structure, and a suction port of the suction nozzle is open to the upper part in the pressure adjustment tank,
    While reducing the pressure of the circulating liquid discharged from the pressure adjustment tank, the fine bubbles contained in the circulating liquid are further sheared and refined by an orifice,
    The third bubble refining means includes a spiral plate, an orifice, an enlarged flow path, a mesh, and a flow path.
    A fine bubble forming apparatus comprising a narrowed opening and discharging into the storage tank.
  2. 2. The fine bubble forming apparatus according to claim 1, wherein the liquid is water and the gas is carbon dioxide gas or air.
  3. 2. The fine bubble forming apparatus according to claim 1, wherein the liquid is a fuel liquid containing heavy oil, and the gas is hydrogen gas.
JP2010077138A 2010-03-30 2010-03-30 Fine bubble forming device. Expired - Fee Related JP5672472B2 (en)

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