JP6368080B2 - Microbubble generator and bubble diameter control method - Google Patents

Description

  The present invention relates to a microbubble generator and a bubble diameter control method.

  In recent years, microbubbles with a diameter of 50 μm or less have been confirmed to exhibit various effects such as, for example, promoting the physiological activity of organisms, improving metabolic functions, promoting growth, etc. Expected.

  For example, Patent Document 1 proposes a nanobubble manufacturing method in which microbubbles are reduced by applying physical stimulation to the microbubbles contained in a liquid. Specifically, Patent Document 1 describes that physical stimulation to microbubbles can be achieved by discharge by a discharge generator, ultrasonic irradiation by an ultrasonic generator, eddy current by operation of a rotating body, and the like. Has been.

JP 2005-245817 A

  However, the method of Patent Document 1 has problems such as an inevitable increase in the size of a device for applying physical stimulation and difficulty in reducing the stable bubbles.

  The present invention has been made in view of the circumstances as described above, and provides a microbubble generator that does not require a special device and can freely reduce and expand bubbles in gas-dissolved water. The challenge is to do. Another object of the present invention is to provide a bubble diameter control method for controlling the diameter of bubbles contained in water containing fine bubbles.

In order to solve the above problems, the microbubble generator of the present invention is a microbubble generator capable of controlling the bubble diameter in the water containing microbubbles,
A gas-liquid supply unit for supplying gas-liquid mixed water;
A microbubble generating unit that generates water containing microbubbles from the gas-liquid mixed water supplied from the gas-liquid supply unit;
A concentration changing unit disposed downstream of the microbubble generating unit and capable of changing the dissolved gas concentration or the saturated dissolved gas concentration in the microbubble-containing water;
The micro-bubble generating unit can generate micro-bubbles by dissolving the gas in the gas-liquid mixed water supplied from the gas-liquid supply unit, or foaming, or supplied from the gas-liquid supply unit Microbubbles can be generated by crushing bubbles in the gas-liquid mixed water,
The concentration changing unit includes the following (1) to (4),
(1) Expansion of bubble diameter by increasing dissolved gas concentration,
(2) Reduction of bubble diameter due to decrease in dissolved gas concentration,
(3) Reduction of bubble diameter by increasing the concentration of saturated dissolved gas,
(4) Expansion of bubble diameter due to decrease in saturated dissolved gas concentration,
It is possible to control at least one of the above.

  In this microbubble generating device, the high concentration gas dissolved water inflow path is connected to the concentration changing section and allows gas dissolved water having a higher concentration than the microbubble-containing water from the microbubble generating section to flow into the concentration changing section. It is preferable that the control of (1) is possible by inflow of the high-concentration gas-dissolved water from the high-concentration gas-dissolved water inflow passage.

  In this microbubble generator, a low-concentration gas-dissolved water inflow path that is connected to the concentration-changing unit and allows gas-dissolved water having a lower concentration than the microbubble-containing water from the microbubble-generating unit to flow into the concentration-changing unit. It is preferable that the control of (2) is possible by the inflow of the low concentration gas dissolved water from the low concentration gas dissolved water inflow path.

  In this microbubble generating device, the concentration changing section has an expansion chamber having a larger channel cross-sectional area than the upstream side and communicating with the outside air, and in this expansion chamber, atmospheric diffusion of dissolved gas in the water containing the microbubbles is performed. It is preferable that the control (2) can be performed.

  In this microbubble generating device, the concentration changing unit includes a water temperature adjusting means, and the water temperature adjusting means can control the above (3) by lowering the temperature of the water containing microbubbles, and this water temperature adjusting means. It is preferable that the control of the above (4) is possible by increasing the temperature of the water containing microbubbles by means.

  In this microbubble generating device, the concentration changing unit includes a channel cross-sectional area adjusting unit, and by increasing the cross-sectional area of the channel through which the microbubble-containing water flows by the channel cross-sectional area adjusting unit, It is preferable that the control (4) can be performed by reducing the cross-sectional area of the flow path through which the water containing the microbubbles flows by the flow path cross-sectional area adjusting means.

The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in water containing microbubbles, and the gas dissolved water having a higher concentration than the water containing microbubbles flows into the water containing microbubbles. be to, it is characterized by enlarging the bubble diameters by increasing the dissolved gas concentration of the microbubbles containing water.

The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in microbubble-containing water, and the gas dissolved water having a lower concentration than the microbubble-containing water flows into the microbubble-containing water. By doing so, the dissolved gas concentration in the microbubble-containing water is lowered to reduce the bubble diameter.

The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in microbubble-containing water, and causes atmospheric diffusion of dissolved gas in the microbubble-containing water, whereby the microbubble-containing water The dissolved gas concentration is reduced to reduce the bubble diameter.
The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in water containing microbubbles, and the saturated dissolved gas concentration is increased by increasing the cross-sectional area of the flow path through which the water containing microbubbles flows. It is characterized in that the bubble diameter is reduced by raising.
The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in microbubble-containing water, and the saturated dissolved gas concentration is reduced by reducing the cross-sectional area of the flow path through which the microbubble-containing water flows. It is characterized by expanding the bubble diameter by lowering.

  According to the microbubble generator of the present invention, a special device is unnecessary, and the bubbles in the gas-dissolved water can be freely reduced and expanded.

It is the schematic which illustrated one Embodiment of the microbubble generator of this invention. It is the schematic which illustrated the inside of the A section (a microbubble generation part and a density | concentration change part) in FIG. It is the schematic which illustrated one Embodiment of the microbubble generator of this invention. It is the schematic which illustrated one Embodiment of the microbubble generator of this invention. It is the schematic which illustrated one Embodiment of the density | concentration change part of the microbubble generator of this invention. It is the schematic which illustrated one Embodiment of the density | concentration change part of the microbubble generator of this invention.

  FIG. 1 is a schematic view illustrating an embodiment of a microbubble generator of the present invention. FIG. 2 is a schematic view illustrating the inside of part A (microbubble generating part and concentration changing part) in FIG.

  In the microbubble generator 1, a gas introduction unit 2, a gas / liquid supply unit 3, a gas dissolving unit 4, a microbubble generation unit 5, and a concentration changing unit 6 are connected by a flow channel from the upstream side.

  The gas introduction unit 2 includes a check valve (not shown) connected to a gas supply source (for example, ambient atmosphere) via a separate line, and an ejector mechanism (not shown). The gas introduction unit 2 introduces a gas (for example, air) into water supplied from the upstream side of the flow path and supplies the gas to the gas-liquid supply unit 3. The check valve supplies gas to the water in the flow path, while suppressing the water in the flow path from flowing back to the gas introduction unit 2. The ejector mechanism is designed so that gas is drawn into the flow path by the negative pressure formed in the flow path formed in the flow path. Therefore, gas-liquid mixed water mixed with gas flows out into the flow path downstream of the gas introduction part 2. The gas introduction unit 2 is not limited to such a structure, and may employ a structure in which the gas of the gas supply source is forcibly pressed into the flow path by an air pump or the like.

  An example of the gas-liquid supply unit 3 is a pump, which supplies gas-liquid mixed water to the gas dissolving unit 4 at a high pressure.

  The gas dissolving unit 4 dissolves the gas in the gas-liquid mixed water supplied from the gas-liquid supply unit 3 to generate gas-dissolved water. Specifically, for example, the gas-liquid mixed water press-fitted into the dissolution tank 41 from the gas-liquid supply unit 3 through the inflow part is sprayed at a high speed to form a bubbling state, whereby the gas in the gas-liquid mixed water is It can be dissolved in water in the dissolution tank. Further, the gas dissolving part 4 can be provided with an exhaust part 42, for example, exhausting excess gas from the gas dissolved water separated when the inside of the dissolving tank 41 is lifted from the exhaust part 42 to the outside. Can do.

  The microbubble generating unit 5 is disposed downstream of the gas dissolving unit 4 and foams a gas in the gas dissolved water to generate water containing microbubbles.

  As illustrated in FIG. 2, the microbubble generator 5 has a contracted flow part 51 having a smaller cross-sectional area than the flow path from the gas dissolving part 4. The gas-dissolved water supplied from the gas-dissolving unit 4 due to the venturi effect by the constricted flow unit 51 has a high flow velocity and a reduced pressure. At this time, the dissolved gas concentration of the gas dissolved water rapidly decreases. Subsequently, when the gas passes through the contracted flow part 51, the gas pressure continuously increases, so that the gas contracts and is divided into microbubbles having a bubble diameter of 100 μm to 500 μm, for example, and microbubble-containing water is generated. Note that the microbubble generating unit 5 is not limited to the form illustrated in FIG. 2, and for example, a known structure for generating a microbubble by generating a shearing force can be appropriately employed. As a method for generating the microbubbles by generating this shearing force, for example, after expanding the bubbles by passing the gas-liquid mixed water containing the bubbles supplied from the gas-liquid supply unit 3 through the venturi tube Examples of the method include shrinking and pulverizing.

The concentration changing unit 6 is disposed downstream of the microbubble generating unit 5. The concentration changing unit 6 is not particularly limited as long as it can freely change the dissolved gas concentration or the saturated dissolved gas concentration in the microbubble-containing water. The density changing unit 6
(1) Expansion of bubble diameter by increasing dissolved gas concentration,
(2) Reduction of bubble diameter due to decrease in dissolved gas concentration,
(3) Reduction of bubble diameter by increasing the concentration of saturated dissolved gas,
(4) Expansion of bubble diameter due to decrease in saturated dissolved gas concentration,
Control of at least one of them is possible.

  That is, the present invention is based on a completely new finding that the gas molecules move so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state between the bubbles and the liquid phase of the water containing the microbubbles. Based on this knowledge, the concentration changing unit 6 downstream of the microbubble generating unit 5 can freely control the reduction or expansion of the bubble diameter by changing the dissolved gas concentration or saturated dissolved gas concentration in the microbubble-containing water. Making it possible.

  Hereinafter, the embodiment of the concentration changing unit and the control of the bubble diameter in the water containing fine bubbles will be described in more detail.

  FIG. 3 is a schematic view illustrating an embodiment of the microbubble generator of the present invention.

  In the microbubble generator 1, a high-concentration gas-dissolved water inflow path 7 branches from the gas dissolution unit 4 and is connected to a concentration changing unit 6 downstream of the microbubble generation unit 5. A first flow rate adjustment valve 71 is provided in the middle of the high concentration gas dissolved water inflow passage 7. In this microbubble generator 1, gas dissolved water having a higher concentration than the microbubble-containing water from the microbubble generating unit 5 flows into the concentration changing unit 6 through the high-concentration gas-dissolved water inflow passage 7. The dissolved gas concentration of increases. At this time, in the microbubble-containing water of the concentration changing unit 6, since the gas molecules in the liquid phase move into the bubbles so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state, the bubble diameter increases. That is, the control (1) is achieved. In this way, the water containing fine bubbles whose bubble diameter is controlled by the concentration changing unit 6 is supplied downstream.

  FIG. 4 is a schematic view illustrating an embodiment of the microbubble generator of the present invention.

  In the microbubble generator 1, a second flow rate adjustment valve 8 is provided in the flow path upstream from the gas introduction unit 2. A low-concentration gas-dissolved water inflow passage 9 branches from the second flow rate adjustment valve 8 and is connected to the concentration changing unit 6 downstream of the microbubble generating unit 5. In this microbubble generator 1, gas dissolved water (water before gas dissolution) having a lower concentration than the microbubble-containing water from the microbubble generator 5 passes through the low concentration gas dissolved water inflow path 9 to the concentration changing unit 6. It flows in and the dissolved gas concentration of the water containing microbubbles decreases. At this time, in the microbubble-containing water of the concentration changing unit 6, since the gas molecules in the bubbles move to the liquid phase and dissolve so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state, the bubble diameter is reduced. . That is, the control (2) is achieved. In this way, the water containing fine bubbles whose bubble diameter is controlled by the concentration changing unit 6 is supplied downstream.

  FIG. 5 is a schematic view illustrating an embodiment of the concentration changing unit of the microbubble generator of the present invention.

  The microbubble generator 1 includes an expansion chamber R that has a larger channel cross-sectional area than the upstream side downstream of the microbubble generator 5 and communicates with the outside air. The microbubble-containing water that has reached the expansion chamber R from the microbubble generator 5 comes into contact with the outside air over a wide area, and atmospheric diffusion of dissolved gas in the microbubble-containing water occurs. By appropriately designing the channel cross-sectional area of the expansion chamber R, the dissolved gas concentration in the water containing fine bubbles can be adjusted. In the microbubble generator 1, the dissolved gas concentration of the microbubble-containing water is reduced by the atmospheric diffusion of the dissolved gas in the expansion chamber R of the concentration changing unit 6. At this time, in the microbubble-containing water, since the gas molecules in the bubbles move to the liquid phase and dissolve so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state, the bubble diameter is reduced. That is, the control (2) is achieved. Then, for example, by reducing the bubbles in the water containing microbubbles, the ratio of nanobubbles can be increased and applied to various applications. In this way, the water containing fine bubbles whose bubble diameter is controlled by the concentration changing unit 6 is supplied downstream.

  FIG. 6 is a schematic view illustrating an embodiment of the concentration changing unit of the microbubble generator of the present invention.

  The concentration changing unit 6 of the microbubble generator 1 includes a water temperature adjusting means T, and the water temperature adjusting means T can control the temperature rise and fall of the water containing the microbubbles. Although the water temperature adjustment means T is not specifically limited, For example, the cooling structure by a refrigerant | coolant and a Peltier device, the heating structure by a heater, etc. can be illustrated. Moreover, a cooling plate, a heating plate, etc. can also be arrange | positioned inside the density | concentration change part 6. FIG.

  When the microbubble generator 1 lowers the water temperature by the water temperature adjusting means T of the concentration changing unit 6, the saturated dissolved gas concentration of the water containing microbubbles increases. At this time, in the microbubble-containing water, since the gas molecules in the bubbles move to the liquid phase and dissolve so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state, the bubble diameter is reduced. That is, the control (3) is achieved. Then, for example, by reducing the bubbles in the water containing microbubbles, the ratio of nanobubbles can be increased and applied to various applications.

  On the other hand, when the microbubble generator 1 raises the water temperature by the water temperature adjusting means T of the concentration changing unit 6, the saturated dissolved gas concentration of the microbubble-containing water decreases. At this time, in the microbubble-containing water, since the gas molecules in the liquid phase move into the bubbles so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state, the bubble diameter is expanded. That is, the control (4) is achieved.

  Furthermore, although not shown in the drawings, as another embodiment, the concentration changing unit can include a channel cross-sectional area adjusting means capable of adjusting the cross-sectional area of the channel through which the microbubble-containing water flows. The saturated dissolved gas concentration can be changed by the cross-sectional area adjusting means. Specifically, the flow path cross-sectional area adjusting means increases the cross-sectional area of the flow path through which the microbubble-containing water flows, thereby causing a pressure increase due to expansion loss and increasing the saturated dissolved gas concentration. As a result, in the water containing microbubbles, the gas molecules in the bubbles move to the liquid phase and dissolve so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state, so the bubble diameter is reduced. That is, the control (3) is achieved. Further, by reducing the cross-sectional area of the flow path through which the microbubble-containing water flows by the flow-path cross-sectional area adjusting means, a pressure drop accompanying an increase in the flow velocity is caused, and the saturated dissolved gas concentration is reduced. As a result, in the water containing fine bubbles, the gas molecules in the liquid phase move into the bubbles so that the gas concentration in the bubbles and the dissolved gas concentration are in an equilibrium state, and the bubble diameter increases. That is, the control (4) is achieved.

  The present invention is a microbubble generator 1 capable of controlling the bubble diameter in water containing microbubbles, and has the following configuration.

  A gas-liquid supply unit 3 for supplying gas-liquid mixed water.

  A microbubble generation unit 5 that generates microbubble-containing water from the gas-liquid mixed water supplied from the gas-liquid supply unit 3.

  A concentration changing unit 6 disposed downstream of the microbubble generating unit 5 and capable of changing a dissolved gas concentration or a saturated dissolved gas concentration in the microbubble-containing water.

  The microbubble generation unit 5 can generate the microbubbles by dissolving the gas in the gas-liquid mixed water supplied from the gas-liquid supply unit 3, or from the gas-liquid supply unit 3. Microbubbles can be generated by crushing bubbles in the supplied gas-liquid mixed water.

Furthermore, the density changing unit 6 can control at least one of the following (1) to (4).
(1) Expansion of bubble diameter due to increase in dissolved gas concentration (2) Reduction of bubble diameter due to decrease in dissolved gas concentration (3) Reduction of bubble diameter due to increase in saturated dissolved gas concentration (4) Due to decrease in saturated dissolved gas concentration Expansion of bubble diameter.

  In addition, the microbubble generator 1 of this invention can also be comprised combining the density | concentration change part 6 illustrated in FIGS. 3-6, and can perform all the control of said (1)-(4). You can also.

  According to the microbubble generator 1, no special device is required, and the bubbles in the gas-dissolved water can be freely reduced and expanded. For this reason, since the bubble diameter in the water containing microbubbles can be controlled according to various applications, the ratio of microbubbles, the ratio of nanobubbles, and the like can be variously adjusted.

  Furthermore, the bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in water containing microbubbles, and increases the bubble diameter by increasing the concentration of dissolved gas in the water containing microbubbles. .

  The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in the water containing microbubbles, and reduces the bubble diameter by reducing the concentration of dissolved gas in the water containing microbubbles. .

The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in the water containing fine bubbles, and increases the saturated dissolved gas concentration by lowering the water temperature of the water containing fine bubbles, Reduce the diameter.

The bubble diameter control method of the present invention is a bubble diameter control method for controlling the diameter of bubbles contained in water containing microbubbles, and lowers the saturated dissolved gas concentration by increasing the water temperature of the water containing microbubbles. Increase the diameter.

  Thus, according to the bubble diameter control method of the present invention, the bubbles in the gas-dissolved water can be freely reduced and enlarged.

  The microbubble generator and the bubble diameter control method of the present invention are not limited to the above embodiments. For example, the concentration changing unit only needs to be able to change the dissolved gas concentration or saturated dissolved gas concentration in the microbubble-containing water, and can be designed in various forms. Moreover, a well-known form is employable suitably also about a gas melt | dissolution part and a microbubble generation | occurrence | production part. Furthermore, the gas dissolving part is not necessarily essential, and the microbubbles can be generated by crushing the bubbles in the gas-liquid mixed water supplied from the gas-liquid supply part by the microbubble generating part.

DESCRIPTION OF SYMBOLS 1 Microbubble generator 3 Gas-liquid supply part 5 Microbubble generator 6 Concentration change part 7 High concentration gas dissolution water inflow path 9 Low concentration gas dissolution water inflow path R Expansion chamber T Water temperature control means

Claims (11)

A microbubble generator capable of controlling the bubble diameter in water containing microbubbles,
A gas-liquid supply unit for supplying gas-liquid mixed water;
A microbubble generating unit that generates water containing microbubbles from the gas-liquid mixed water supplied from the gas-liquid supply unit;
A concentration changing unit disposed downstream of the microbubble generating unit and capable of changing the dissolved gas concentration or the saturated dissolved gas concentration in the microbubble-containing water;
The micro-bubble generating unit can generate micro-bubbles by dissolving the gas in the gas-liquid mixed water supplied from the gas-liquid supply unit, or foaming, or supplied from the gas-liquid supply unit Microbubbles can be generated by crushing bubbles in the gas-liquid mixed water,
The concentration changing unit includes the following (1) to (4),
(1) Expansion of bubble diameter by increasing dissolved gas concentration,
(2) Reduction of bubble diameter due to decrease in dissolved gas concentration,
(3) Reduction of bubble diameter by increasing the concentration of saturated dissolved gas,
(4) Expansion of bubble diameter due to decrease in saturated dissolved gas concentration,
A microbubble generator characterized in that control of at least one of the above is possible.   A high-concentration gas-dissolved water inflow path that is connected to the concentration-changing unit and allows gas-dissolved water having a higher concentration than the microbubble-containing water from the microbubble-generating unit to flow into the concentration-changing unit; 2. The microbubble generator according to claim 1, wherein the control of (1) is possible by inflow of high-concentration gas-dissolved water from a dissolved-water inflow path.   The low concentration gas is provided with a low concentration gas dissolved water inflow path connected to the concentration changing unit and flowing into the concentration changing unit a gas dissolved water having a concentration lower than that of the microbubble-containing water from the microbubble generating unit. 2. The microbubble generator according to claim 1, wherein the control of (2) is possible by inflow of low-concentration gas-dissolved water from a dissolved water inflow path.   The concentration changing section includes an expansion chamber having a larger channel cross-sectional area than the upstream side and communicating with the outside air. In the expansion chamber, the atmospheric diffusion of the dissolved gas in the water containing microbubbles occurs, and the (2 The microbubble generator according to claim 1, wherein the control is possible.   The concentration changing unit includes a water temperature adjusting means, and the control of (3) is possible by lowering the temperature of the water containing fine bubbles by the water temperature adjusting means, and the water containing the fine bubbles is controlled by the water temperature adjusting means. 2. The microbubble generator according to claim 1, wherein the control of (4) is possible by increasing the temperature.   The concentration changing unit includes a flow path cross-sectional area adjusting means, and the control of (3) is possible by increasing the cross-sectional area of the flow path through which the water containing microbubbles flows by the flow path cross-sectional area adjusting means, and 2. The microbubble generator according to claim 1, wherein the control of (4) is possible by reducing the cross-sectional area of the flow channel through which the microbubble-containing water flows by the flow channel cross-sectional area adjusting means. .   A bubble diameter control method for controlling the diameter of bubbles contained in water containing microbubbles, wherein a gas dissolved water having a concentration higher than that of water containing microbubbles is allowed to flow into the water containing microbubbles. A bubble diameter control method characterized by increasing a dissolved gas concentration and expanding a bubble diameter.   A bubble diameter control method for controlling the diameter of bubbles contained in water containing microbubbles, wherein a gas-dissolved water having a concentration lower than that of water containing microbubbles is caused to flow into the water containing microbubbles. A bubble diameter control method, wherein the dissolved gas concentration is reduced to reduce the bubble diameter. A bubble diameter control method for controlling the diameter of the air bubbles contained in the microbubble-containing water, by cause atmospheric dispersion of dissolved gas microbubble-containing water, to lower the dissolved gas concentration of microbubbles in water containing A bubble diameter control method, wherein the bubble diameter is reduced. A bubble diameter control method for controlling the diameter of the air bubbles contained in the microbubble-containing water, causing reduced bubble size by increasing the saturated dissolved gas concentration by increasing the cross-sectional area of the flow path microbubble-containing water flows The bubble diameter control method characterized by the above-mentioned. A bubble diameter control method for controlling the diameter of bubbles contained in water containing microbubbles, and reducing the cross-sectional area of the flow path through which the water containing microbubbles reduces the concentration of dissolved dissolved gas to expand the bubble diameter. The bubble diameter control method characterized by the above-mentioned.

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