JP2018030094A - Fine bubble generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a fine bubble-containing fluid containing a large number of fine bubbles with low power consumption. A pump 2 pressurizes a liquid 11 such as water sucked through a liquid flow path 21 on the suction side, and supplies the liquid 11 to a first jet type fine bubble generation box 3A through the liquid flow path 22 on the discharge side. The first fine bubble-containing fluid 13 discharged from the first jet-type fine bubble generation box 3A is supplied to the second jet-type fine bubble generation box 3B through the first connection flow path 71. The second fine bubble-containing fluid 14 discharged from the second jet-type fine bubble generation box 3B is supplied to a predetermined fine bubble utilization location through the delivery flow path 81 and used for cleaning, sterilization, purification, decontamination, etc. Will be done. [Selection diagram] Fig. 1

Description

  The present invention relates to a microbubble generator for generating microbubbles. More specifically, the present invention relates to a microbubble generator for generating a large number of microbubbles (microbubbles, nanobubbles) having a diameter of micrometer order or nanometer order.

  In recent years, microbubbles called nanobubbles (for example, bubbles having a diameter of 1 micrometer or less), microbubbles (for example, bubbles having a diameter of 50 micrometers or less when generated) have various excellent characteristics. It is used in various fields. For example, by utilizing the characteristics of microbubbles and nanobubbles, they are used for cleaning various objects, sterilizing, purifying contaminated water, removing radioactive materials from contamination, and the like.

  Various devices have been put to practical use as devices for generating fine bubbles such as nanobubbles and microbubbles. As devices developed by the present applicant, Patent Literature 1, Patent Literature 2, and Patent Literature 3 is a fine bubble generator. The fine bubble generating devices disclosed in Patent Document 1 to Patent Document 3 pressurize a liquid to a predetermined pressure with a pump, and introduce the pressurized liquid into a nozzle of a box-shaped jet type fine bubble generating box. Then, the fine bubble-containing fluid is generated by cavitation and vortex of the liquid injected into the jet type fine bubble generation box, and the fine bubble-containing fluid is discharged from the fluid outlet of the jet type fine bubble generation box and used. The structure is adopted. The fine bubble generator disclosed in Patent Literature 1 to Patent Literature 3 has an advantage that a fluid containing fine bubbles can be stably generated with a simple structure.

  It is preferable that the fine bubble-containing fluid contains a large number of fine bubbles since the ability of cleaning, sterilization, purification, and decontamination becomes high. However, in the fine bubble generator disclosed in Patent Document 1 to Patent Document 3, in order to increase the number of contained fine bubbles, the output of the pump for pressurizing the liquid is increased, and the jet type fine bubble generation box It is necessary to increase the pressure of the liquid introduced into the nozzle. However, when the output of the pump is increased, the power consumption of the pump increases, so that the running cost increases and it is not economical.

Japanese Patent Laid-Open No. 11-319819 JP 2000-563 A JP 2016-36775 A

  The present invention has been invented against the background as described above, and achieves the following objects. An object of the present invention is to provide a microbubble generator capable of generating a microbubble-containing fluid containing a large number of microbubbles with low power consumption.

The present invention employs the following means in order to solve the above problems.
That is, the fine bubble generator of the present invention 1
A pump for pressurizing and discharging liquid to a predetermined pressure;
A first nozzle having an injection port for introducing the pressurized liquid into the first internal space and generating fine particles generated by cavitation and vortex of the liquid injected into the first internal space A first jet-type fine bubble generation box for discharging a first fine bubble-containing fluid containing bubbles;
A second nozzle having an injection port for introducing the first fine bubble-containing fluid discharged from the first jet-type fine bubble generation box and ejecting the fluid into the second internal space; A cavitation of the first fine bubble-containing fluid injected into the space and a second jet type fine bubble generation box for discharging the second fine bubble-containing fluid containing the fine bubbles generated by the vortex flow are provided. And

  The fine bubble generating apparatus according to the second aspect of the present invention is the jet for introducing the second fine bubble-containing fluid discharged from the second jet type fine bubble generating box into the third internal space according to the first aspect of the present invention. A third nozzle having a mouth for discharging a third microbubble-containing fluid including microbubbles generated by cavitation and vortex of the second microbubble-containing fluid injected into the third internal space; 3 jet-type fine bubble generating boxes.

  According to a third aspect of the present invention, there is provided the fine bubble generating device according to the first or second aspect, wherein the first nozzle includes a liquid guiding path for guiding the pressurized liquid to the ejection port, and a negative pressure of the liquid. And a gas guide path for guiding the gas to the injection port.

  According to a fourth aspect of the present invention, there is provided the fine bubble generating device according to the third aspect, wherein the liquid guiding path is formed at an axial center of the first nozzle, and the gas guiding path is formed in an annular shape on an outer periphery of the liquid guiding path. The gas guide path and the liquid guide path merge at the injection port.

  According to a fifth aspect of the present invention, there is provided the fine bubble generating apparatus according to the first or second aspect, wherein the pump is a gas-liquid mixing pump that mixes a gas with the liquid and discharges a gas-liquid mixed fluid.

According to a sixth aspect of the present invention, there is provided the fine bubble generating device according to the fifth aspect, wherein the first nozzle includes a liquid guiding path for guiding the pressurized gas-liquid mixed fluid to the ejection port, and the gas-liquid mixed fluid. And a gas guiding path for guiding gas to the injection port by negative pressure.
According to a seventh aspect of the present invention, there is provided the fine bubble generating device according to the sixth aspect, wherein the liquid guiding path is formed at an axis of the first nozzle, and the gas guiding path is formed in an annular shape on an outer periphery of the liquid guiding path. The gas guide path and the liquid guide path merge at the injection port.

  The fine bubble generating apparatus of the present invention introduces the liquid discharged from the pump into the second jet type fine bubble generation box via the first jet type fine bubble generation box, thereby forming a fine bubble-containing fluid. Since the number of contained fine bubbles is increased, the power consumption of the pump can be suppressed.

FIG. 1 is a circuit diagram showing a microbubble generator according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the first jet type fine bubble generating box of FIG. FIG. 3 is a longitudinal sectional view of the second jet type fine bubble generating box of FIG. FIG. 4 is a circuit diagram showing an example in which a third jet type fine bubble generating box is added to the fine bubble generating apparatus of the first embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing a modification of the first nozzle of the first jet type fine bubble generation box of the fine bubble generation device of the first embodiment. FIG. 6 is a circuit diagram showing a microbubble generator according to the second embodiment of the present invention. FIG. 7 is a circuit diagram showing an example in which a third jet type fine bubble generation box is added to the fine bubble generation apparatus of the second embodiment of the present invention. FIG. 8 is a circuit diagram showing a microbubble generator according to the third embodiment of the present invention. FIG. 9 is a circuit diagram showing an example in which a third jet type fine bubble generating box is added to the fine bubble generating apparatus of the third embodiment of the present invention.

[First embodiment of microbubble generator]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a fine bubble generating apparatus 1 according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a first jet type fine bubble generating box 3A in FIG. 1, and FIG. It is a longitudinal cross-sectional view of the 2nd jet type fine bubble generation box 3B. As shown in FIG. 1, a fine bubble generating apparatus 1 according to the first embodiment of the present invention includes a pump 2, a first jet type fine bubble generation box 3A, a second jet type fine bubble generation box 3B, and the like. It is configured. The pump 2 pressurizes the liquid 11 such as water sucked through the suction-side liquid flow path 21 and supplies the pressurized liquid 11 to the first jet type fine bubble generating box 3A through the discharge-side liquid flow path 22. In the first embodiment of the present invention, the discharge pressure of the pump 2 is set to 0.5 MPa.

  A valve 23 and a pressure gauge 24 are attached to the liquid channel 21 on the suction side. A pressure gauge 25, a valve 26, and a flow meter 27 are attached to the liquid channel 22 on the discharge side. A gas 12 such as air is supplied to the first jet type fine bubble generating box 3 </ b> A through the gas flow path 61. The gas suction side of the gas channel 61 is open to the atmosphere, and a pressure gauge 62, a valve 63, a flow meter 64, and a valve 65 are attached to the gas channel 61. The liquid 11 may be other types of liquid other than water, and the gas 12 may be other types of gas other than air, such as oxygen, ozone, nitrogen, and the like.

  The first fine bubble-containing fluid 13 discharged from the first jet type fine bubble generation box 3 </ b> A is supplied to the second jet type fine bubble generation box 3 </ b> B through the first connection channel 71. A pressure gauge 72 and a valve 73 are attached to the first connection channel 71. The second microbubble-containing fluid 14 discharged from the second jet-type microbubble generating box 3B is supplied to a predetermined microbubble use location through the delivery channel 81 and used for cleaning, sterilization, purification, decontamination, etc. Is done. A pressure gauge 82 and a valve 83 are attached to the delivery channel 81.

  As shown in FIG. 2, the first jet type fine bubble generating box 3A is formed in a flat rectangular parallelepiped shape, and is arranged so that its longitudinal direction is vertical. A first nozzle 31A for introducing the liquid 11 and the gas 12 is fixed to the upper part of the first jet type fine bubble generating box 3A. The first nozzle 31A includes a liquid introduction part 32 and an injection port part 33, and is fixed to a flange part 34A at the upper end of the first jet type fine bubble generating box 3A with a bolt (not shown). In addition, a first fluid outlet 341 for discharging the first fine bubble-containing fluid 13 to the first connection channel 71 is provided at the flange 34B at the lower end of the first jet type fine bubble generation box 3A. Is formed.

  A liquid guiding path 321 is formed at the axial center of the liquid introducing part 32, and the upper part of the liquid guiding path 321 is connected to the liquid channel 22 described above. An injection port 331 having a diameter D <b> 1 is formed at the axial center of the injection port 33, and the lower end of the liquid guide path 321 is open to the injection port 331. An annular gas guide path 35 is formed between the outer periphery of the cylindrical shaft portion of the liquid introduction portion 32 and the cylindrical hole portion of the ejection port portion 33. The gas guide path 35 and the liquid guide path 321 merge at the injection port 331. The injection port 33 is formed with a gas introduction hole 332 that is connected to the gas flow path 61 and that introduces gas into the gas guide path 35.

  When the pressurized liquid 11 is supplied to the liquid guiding path 321, the gas 12 in the gas guiding path 35 is drawn by the negative pressure, and the liquid 11 and the gas 12 merge at the ejection port 331. Since the gas 12 joins from the entire circumference of the liquid 11, the gas 12 is efficiently mixed with the liquid 11. A partitioned flat rectangular parallelepiped microbubble generating chamber 36 is formed inside the first jet type microbubble generating box 3A. The fine bubble generating chamber 36 is flat in a three-dimensional box-shaped space, and the thickness of the space (the length in the direction perpendicular to the paper surface in FIG. 2) is H (not shown), and the width of the space is W ( If the height of the space is L (length in the vertical direction in FIG. 2) and the diameter of the injection port 331 is D1, D1 <H, W / H ≧ 4, and There is a relationship of W <L. The internal space of the fine bubble generating chamber 36 is preferably a flat and rectangular space.

  The mixed fluid of the liquid 11 and the gas 12 ejected from the ejection port 331 to the fine bubble generating chamber 36 decreases in pressure as the ejection speed increases. When the pressure decreases to the saturated vapor pressure, the liquid 11 evaporates. Thus, a phenomenon called cavitation in which bubbles are generated occurs. As a result, bubbles due to the cavitation phenomenon are generated in the jet water in which the mixed fluid of the liquid 11 and the gas 12 is ejected from the ejection port 331. Thereafter, when the pressure reduced to the saturated vapor pressure gradually starts to return to the original pressure on the downstream side of the jet water, the bubbles are compressed and crushed. High-temperature and high-pressure energy generated when this bubble is crushed is radiated to the surroundings, and this energy makes the bubbles in the jet water finer, resulting in microbubbles (microbubbles) on the order of micrometer (μm) with a very small diameter. Generated.

  The mixed fluid of the liquid 11 and the gas 12 ejected from the ejection port 331 becomes jet water and flows in the fine bubble generating chamber 36. The main jets 37 </ b> A and 37 </ b> B of jet water are jetted in a direction substantially parallel to the axis of the jet port 331. The main jets 37 </ b> A and 37 </ b> B flow in a curved manner so as to be drawn toward either one of the wall surfaces of the fine bubble generation chamber 36 by the Coanda effect (effect in which the jet is drawn to a nearby wall). Moreover, since it flows so that it may curve also in a corner part, the main jets 37A and 37B of jet water become a vortex which flows in a vortex. In the main jets 37A and 37B of the jet water, the direction of rotation of the vortex changes drastically, and the flow becomes like the main jets 37A and 37B shown in FIG. At the corners of the fine bubble generating chamber 36, an adhering vortex 38 that is a low-pressure vortex is generated by the Coanda effect.

  The main jets 37 </ b> A and 37 </ b> B are not stable and sway in an arrow + w direction or an arrow −w direction within the plane of the width W. Similarly, in the surface of the thickness H, the same vibration is generated, and a flow of movement in which the rotational direction of the vortex changes drastically is obtained. That is, the main jets 37A and 37B cause cavitation, are unstable and flow while shaking, and eddy currents are generated. In other words, a vortex phenomenon with a strong stirring force occurs in the fine bubble generating chamber 36, and the rotational direction of this vortex flow changes drastically. The jet flow in which the rotation directions of the main jets 37A and 37B and the attached vortex flow 38 change drastically gives an extremely strong shearing force to the jet water in which the mixed fluid of the liquid 11 and the gas 12 and the fine bubbles are mixed.

  This shearing force promotes the mixing of the fine bubbles and the jet water, and also shears the fine bubbles to generate fine bubbles (nanobubbles) on the order of nanometers (nm) having a very small diameter. The fine bubbles that have been refined as described above become, for example, fine bubbles having a diameter of several tens of nanometers to several hundreds of nanometers, and are mixed with jet water to form the first fine bubble-containing fluid 13. The first fine bubble-containing fluid 13 generated in this way is discharged from the first jet type fine bubble generation box 3A through the first fluid outlet 341 and supplied to the second jet type fine bubble generation box 3B. Is done. The discharge pressure of the first fine bubble-containing fluid 13 is slightly lower than the pressure of the liquid 11 supplied to the liquid guide path 321 of the first jet type fine bubble generation box 3A.

  Since the second jet type fine bubble generation box 3B has the same structure as the first jet type fine bubble generation box 3A, the main structure has the same structure as the first jet type fine bubble generation box 3A. Are described with the same numbers. That is, as shown in FIG. 3, the second nozzle 31B for introducing the first fine bubble-containing fluid 13 is fixed to the upper part of the second jet type fine bubble generation box 3B. The difference between the second nozzle 31B and the first nozzle 31A is that the gas inlet hole 332 for introducing the gas 12 is not formed in the injection port portion 33B of the second nozzle 31B. Further, a second fluid outlet 342 for discharging the second fine bubble-containing fluid 14 to the delivery channel 81 is formed in the flange portion 34B at the lower end of the second jet type fine bubble generation box 3B. Yes. A liquid guiding path 321 is formed at the axial center of the liquid introducing part 32 in the same manner as the first jet type fine bubble generating box 3A, and the upper part of the liquid guiding path 321 is connected to the first connecting channel 71 described above. Yes.

  The first microbubble-containing fluid 13 is supplied to the liquid guide path 321, and the first microbubble-containing fluid 13 is jetted from the ejection port 331 to the microbubble generation chamber 36. Then, as the injection speed increases, the pressure decreases, and when the pressure decreases to the saturated vapor pressure, a cavitation phenomenon occurs, and the first fine bubble-containing fluid 13 evaporates to generate bubbles. Thereafter, when the pressure reduced to the saturated vapor pressure gradually starts to return to the original pressure on the downstream side of the jet water, the bubbles and the fine bubbles are compressed and crushed. High-temperature and high-pressure energy generated when these bubbles and microbubbles are crushed is radiated to the surroundings, and this energy makes the bubbles and microbubbles in the jet water finer, and microbubbles (microbubbles) on the order of micrometers (μm). And fine bubbles (nanobubbles) on the order of nanometers (nm) are generated.

  The extremely strong shearing force of the main jets 37A and 37B and the adhering vortex 38 in the microbubble generation chamber 36 promotes mixing of the microbubbles with the first microbubble-containing fluid 13 and shears the microbubbles so that the diameter is increased. Very fine nanometer (nm) order fine bubbles (nanobubbles) are generated. The microbubbles that have undergone such miniaturization become, for example, microbubbles having a diameter of several tens of nanometers or less and are mixed with the first microbubble-containing fluid 13, and the microbubbles are from the first microbubble-containing fluid 13. The second fine bubble-containing fluid 14 is also increased. The second fine bubble-containing fluid 14 generated in this way is discharged from the second jet type fine bubble generation box 3B through the second fluid outlet 342, and through a delivery flow path 81, a predetermined fine bubble utilization location. And used for cleaning, sterilization, purification, decontamination, etc. The discharge pressure of the second fine bubble-containing fluid 14 is slightly lower than the discharge pressure of the first fine bubble-containing fluid 13.

  Thus, the second fine bubble-containing fluid 14 in which the number of fine bubbles is increased by the second jet type fine bubble generation box 3B has a further effect on cleaning and the like. In the fine bubble generator 1 of the first embodiment of the present invention, the liquid 11 discharged from the pump 2 is supplied to the second jet type fine bubble generation box via the first jet type fine bubble generation box 3A. Since it introduce | transduces into 3B and the fine bubble containing fluid with which the number of fine bubbles increased is produced | generated, it becomes possible to suppress the power consumption of the pump 2. FIG.

  FIG. 4 is a circuit diagram showing an example in which a third jet type fine bubble generating box 3C is added to the fine bubble generating apparatus 1 of the first embodiment of the present invention. That is, as shown in FIG. 4, the second fine bubble-containing fluid 14 discharged from the second jet type fine bubble generation box 3 </ b> B passes through the second connection flow path 74 to the third jet type fine bubble generation box. Supplied to 3C. A pressure gauge 75 and a valve 76 are attached to the second connection channel 74. The third microbubble-containing fluid 15 discharged from the third jet-type microbubble generating box 3C is supplied to a predetermined microbubble use location through the delivery channel 81 and used for cleaning, sterilization, purification, decontamination, etc. Is done. A pressure gauge 82 and a valve 83 are attached to the delivery channel 81.

  Since the structure of the third jet type fine bubble generation box 3C is exactly the same as that of the second jet type fine bubble generation box 3B, detailed illustration and description thereof will be omitted. That is, in the fine bubble generating device 1 of FIG. 4, the second fine bubble-containing fluid 14 discharged from the second jet type fine bubble generation box 3 </ b> B passes through the second connection flow path 74 to the third jet type fine particle. It is supplied to a third nozzle (not shown) of the bubble generation box 3C. When the second fine bubble-containing fluid 14 is injected from the injection port of the third nozzle into the fine bubble generation chamber, a cavitation phenomenon occurs as in the case of the second jet type fine bubble generation box 3B described above, The second fine bubble-containing fluid 14 evaporates to generate bubbles. Thereafter, as in the case of the second jet type fine bubble generation box 3B described above, the bubbles and the fine bubbles in the jet water are refined by the high-temperature and high-pressure energy generated when the bubbles and the fine bubbles are crushed. Both fine bubbles (microbubbles) on the order of (μm) and fine bubbles (nanobubbles) on the order of nanometers (nm) are generated.

  After that, due to the extremely strong shearing force of the main jet and the attached vortex in the fine bubble generating chamber, the fine bubbles with a diameter of several tens of nanometers or less are mixed with the second fine bubble-containing fluid 14, and the fine bubbles become the second fine bubbles. The third fine bubble-containing fluid 15 is increased as compared with the bubble-containing fluid 14. The third fine bubble-containing fluid 15 generated in this way is discharged from the third jet type fine bubble generation box 3C through a third fluid outlet (not shown), and passes through a delivery flow path 81 for a predetermined amount. It is supplied to the location where microbubbles are used and used for cleaning, sterilization, purification, decontamination and the like. In this way, the third fine bubble-containing fluid 15 that has been refined again by the third jet-type fine bubble generation box 3C and has further increased the number of fine bubbles has a further effect on cleaning and the like.

  FIG. 5 is a longitudinal sectional view showing a modification of the first nozzle 31A of the first jet type fine bubble generating box 3A. In the first jet type fine bubble generating box 3 </ b> A shown in FIG. 2, one gas introduction hole 332 for introducing gas into the gas guide path 35 is formed in the injection port 33. In the first jet type fine bubble generation box 3A of the modification of FIG. 5, a gas introduction hole 333 is formed in addition to the gas introduction hole 332 for introducing gas into the gas guide path 35. An injection port 334 having a diameter D2 is formed at the axial center of the injection port 33, and the lower end of the liquid guide path 321 opens into the injection port 334. Since the pipe resistance when introducing gas into the gas guiding path 35 is reduced, a large amount of gas can be effectively introduced from the gas channel 61 into the gas guiding path 35.

[Second Embodiment of Fine Bubble Generator]
FIG. 6 is a circuit diagram showing a microbubble generator 10 according to a second embodiment of the present invention. The microbubble generator 10 of the second embodiment of the present invention is an example in which the pump 2 of the microbubble generator 1 of the first embodiment is changed to a gas-liquid mixing pump 20. As shown in FIG. 6, the gas-liquid mixing pump 20 sucks both the liquid 11 such as water through the liquid channel 21 on the suction side and the gas 12 such as air through the gas channel 41 and pressurizes the liquid. 11 is mixed with a gas 12 to form a gas-liquid mixed fluid 16. This gas-liquid mixed fluid 16 is supplied to the first jet type fine bubble generating box 3A through the gas-liquid flow path 28 on the discharge side. A valve 23 and a pressure gauge 24 are attached to the liquid channel 21 on the suction side. A pressure gauge 25, a valve 26, and a flow meter 27 are attached to the gas-liquid flow path 28 on the discharge side.

  The inlet side of the gas channel 41 is open to the atmosphere, and a pressure gauge 42, a valve 43, a flow meter 44, and a valve 45 are attached to the gas channel 41. Similarly to the fine bubble generating device 1 of the first embodiment, the gas 12 such as air is supplied to the first jet type fine bubble generating box 3A through the gas flow path 61. The gas flow path 61 is open to the atmosphere, and a pressure gauge 62, a valve 63, a flow meter 64, and a valve 65 are attached to the gas flow path 61. The liquid 11 may be other types of liquid other than water, and the gas 12 may be other types of gas other than air, such as oxygen, ozone, nitrogen, and the like.

  The gas-liquid mixing pump 20 is an eddy current pump having an impeller. The gas 12 is sucked by the negative pressure of the pressurized liquid 11, and a large amount of the gas 12 is mixed into the liquid 11 by the vortex of the pressurized liquid 11. The The gas 12 mixed with the liquid 11 is subjected to a shearing force due to the vortex and becomes fine primary microbubbles (for example, microbubbles having a diameter of the order of micrometers (μm)). The gas-liquid mixed fluid 16 containing the primary fine bubbles is supplied to the first jet type fine bubble generation box 3A. A gas 12 such as air is also supplied to the first jet type fine bubble generating box 3 </ b> A through the gas flow path 61.

  The gas-liquid mixed fluid 16 and the gas 12 supplied to the first jet type fine bubble generating box 3A are reduced in pressure as the injection speed increases, and when the pressure decreases to the saturated vapor pressure, A phenomenon called cavitation occurs in which the liquid mixture fluid 16 evaporates and bubbles are generated. As a result, bubbles due to the cavitation phenomenon are generated in the jet water in which the mixed fluid of the gas-liquid mixed fluid 16 and the gas 12 is ejected from the ejection port 331. Thereafter, when the pressure reduced to the saturated vapor pressure gradually starts to return to the original pressure on the downstream side of the jet water, the bubbles and the fine bubbles are compressed and crushed. High-temperature and high-pressure energy generated when these bubbles are crushed is radiated to the surroundings, and the bubbles and microbubbles in the jet water are further refined by this energy, and microbubbles (μm) on the order of extremely small diameters (μm) ( Both microbubbles and nanometer (nm) order fine bubbles (nanobubbles) are generated.

  The mixed fluid of the gas-liquid mixed fluid 16 and the gas 12 injected from the injection port 331 of the first jet type fine bubble generating box 3A generates a strong vortex phenomenon with a stirring force. A very strong shearing force is given to jet water mixed with mixed fluid and fine bubbles. This shearing force promotes the mixing of the fine bubbles and the jet water, and also shears the fine bubbles to generate fine bubbles (nanobubbles) on the order of nanometers (nm) having a very small diameter. The secondary microbubbles that have undergone such miniaturization become, for example, microbubbles having a diameter of several tens of nanometers or less, and are mixed with the mixed fluid of the gas-liquid mixed fluid 16 and the gas 12 to contain the first microbubbles. Fluid 13 is obtained.

  The first fine bubble-containing fluid 13 generated in this way is discharged from the first jet type fine bubble generation box 3A and supplied to the second jet type fine bubble generation box 3B. By passing through the second jet-type fine bubble generating box 3B, the fine bubbles of the first fine bubble-containing fluid 13 are re-refined to become tertiary fine bubbles, and the number of fine bubbles increases. The second fine bubble-containing fluid 14 including the tertiary fine bubbles is used for various purposes such as cleaning through the delivery flow path 81. As described above, by the configuration in which the gas-liquid mixing pump 20 is provided, the second fine bubble-containing fluid 14 that further refines the bubbles and includes the fine bubbles has a further effect on cleaning and the like. In the fine bubble generating apparatus 10 of the second embodiment of the present invention, the gas-liquid mixed fluid 16 containing primary fine bubbles discharged from the gas-liquid mixing pump 20 is used as the first jet type fine bubble generating box 3A. Is introduced into the second jet type fine bubble generating box 3B. Accordingly, it is possible to further reduce the size of the bubbles as compared with the fine bubble generation device 1 of the first embodiment, thereby suppressing the power consumption of the gas-liquid mixing pump 20.

  The operation conditions and operation results performed by the microbubble generator 10 of the second embodiment of the present invention are as follows. That is, the gas-liquid mixing pump 20 is an eddy current turbo mixer manufactured by Nikuni Co., Ltd. (head office: Kanagawa, Japan), and has a set pressure of 0.5 MPa and a flow rate of 10 to 300 L / min. The supply pressure to the first jet type fine bubble generation box 3A was 0.4 MPa to 0.5 MPa, and the discharge pressure from the first jet type fine bubble generation box 3A was 0.4 MPa to 0.5 MPa. The supply pressure to the second jet type fine bubble generation box 3B is 0.3 MPa to 0.4 MPa, and the discharge pressure from the second jet type fine bubble generation box 3B is 0.3 MPa to 0.4 MPa. It was. As the gas 12, oxygen, ozone, carbon dioxide, nitrogen, hydrogen and air were used. The second fine bubble-containing fluid 14 was used for environmental improvements such as soil purification, factory wastewater treatment, and PH neutralization. It was also used for agricultural improvement such as growth promotion and yield increase. In addition, it was used to improve fisheries such as growth and cultivation, aquaculture for preservation of freshness, preservation, etc.

  FIG. 7 is a circuit diagram showing an example in which a third jet type fine bubble generating box 3C is added to the fine bubble generating apparatus 10 according to the second embodiment of the present invention. That is, as shown in FIG. 7, the second fine bubble-containing fluid 14 discharged from the second jet type fine bubble generation box 3 </ b> B passes through the second connection flow path 74 to the third jet type fine bubble generation box. Supplied to 3C. The third microbubble-containing fluid 15 discharged from the third jet-type microbubble generating box 3C is supplied to a predetermined microbubble use location through the delivery channel 81 and used for cleaning, sterilization, purification, decontamination, etc. Is done. The third fine bubble-containing fluid 15 which has been re-refined by the third jet type fine bubble generation box 3C and further increased in the number of fine bubbles has a further effect on cleaning and the like.

[Third embodiment of microbubble generator]
FIG. 8 is a circuit diagram showing a microbubble generator 100 according to a third embodiment of the present invention. The fine bubble generating apparatus 100 of the third embodiment of the present invention is configured not to supply the gas 12 to the first jet type fine bubble generating box 3A in the fine bubble generating apparatus 10 of the second embodiment. It is an example. Accordingly, there is no gas flow path 61 of the fine bubble generating device 10 of the second embodiment, and the first jet type fine bubble generating box 3A is plugged into the gas introduction hole 332 of the injection port portion 33 and gas 12 is prevented from being sucked into the gas guide path 35. Accordingly, only the gas-liquid mixed fluid 16 is supplied to the first jet type fine bubble generating box 3A. Also in the microbubble generator 100 of the third embodiment, microbubbles (nanobubbles) on the order of nanometers (nm) having a very small diameter are generated by cavitation, bubble collapse, and extremely strong shearing force due to the eddy current phenomenon. be able to. The first fine bubble-containing fluid 13 generated in this way is supplied to the second jet-type fine bubble generation box 3B in the same manner as the fine bubble generation device 10 of the second embodiment.

  FIG. 9 is a circuit diagram showing an example in which a third jet type fine bubble generating box 3C is added to the fine bubble generating apparatus 100 according to the third embodiment of the present invention. As shown in FIG. 9, the second fine bubble-containing fluid 14 discharged from the second jet type fine bubble generation box 3 </ b> B passes through the second connection flow path 74 to the third jet type fine bubble generation box 3 </ b> C. Supplied. The third microbubble-containing fluid 15 discharged from the third jet-type microbubble generating box 3C is supplied to a predetermined microbubble use location through the delivery channel 81 and used for cleaning, sterilization, purification, decontamination, etc. Is done. The third fine bubble-containing fluid 15 which has been re-refined by the third jet type fine bubble generation box 3C and further increased in the number of fine bubbles has a further effect on cleaning and the like.

  As mentioned above, although the Example of this invention was described, this invention is not limited to this Example. For example, in the above-described embodiment, two or three jet-type fine bubble generation boxes are connected in series, but four or more may be connected in series. Moreover, you may introduce | transduce the microbubble containing fluid discharged from the jet-type microbubble generation box simultaneously to the several jet-type microbubble generation box connected in parallel. Furthermore, in the fine bubble generating device 1 of the first embodiment, the gas 12 does not have to be introduced from the gas flow path 61 into the first jet type fine bubble generating box 3A.

DESCRIPTION OF SYMBOLS 1 ... Fine bubble generator 10 ... Fine bubble generator 100 ... Fine bubble generator 11 ... Liquid 12 ... Gas 13 ... 1st fine bubble containing fluid 14 ... 2nd fine bubble containing fluid 15 ... 3rd fine bubble containing Fluid 16 ... Gas-liquid mixed fluid 2 ... Pump 20 ... Gas-liquid mixing pumps 21 and 22 ... Liquid flow path 23 ... Valve 24 ... Pressure gauge 25 ... Pressure gauge 26 ... Valve 27 ... Flow meter 28 ... Gas-liquid flow path 3A ... 1 jet type fine bubble generation box 3B ... 2nd jet type fine bubble generation box 3C ... 3rd jet type fine bubble generation box 31A ... 1st nozzle 31B ... 2nd nozzle 32 ... Liquid introduction part 321 ... Liquid Guiding path 33 ... injection port 33B ... injection port 331 ... injection port 332 ... gas introduction hole 333 ... gas introduction hole 334 ... injection port 34A ... flange 34B ... flange 341 ... first fluid outlet 342 ... second The fluid outlet part 35 ... Body guiding path 36 ... fine bubble generating chambers 37A and 37B ... main jet 38 ... adhering vortex 41 ... gas flow path 42 ... pressure gauge 43 ... valve 44 ... flow meter 45 ... valve 61 ... gas flow path 62 ... pressure gauge 63 ... valve 64 ... Flow meter 65 ... Valve 71 ... First connection flow path 72 ... Pressure gauge 73 ... Valve 74 ... Second connection flow path 75 ... Pressure gauge 76 ... Valve 81 ... Delivery flow path 82 ... Pressure gauge 83 ... Valve

Claims (7)

A pump for pressurizing and discharging liquid to a predetermined pressure;
A first nozzle having an injection port for introducing the pressurized liquid into the first internal space and generating fine particles generated by cavitation and vortex of the liquid injected into the first internal space A first jet-type fine bubble generation box for discharging a first fine bubble-containing fluid containing bubbles;
A second nozzle having an injection port for introducing the first fine bubble-containing fluid discharged from the first jet-type fine bubble generation box and ejecting the fluid into the second internal space; A cavitation of the first fine bubble-containing fluid injected into the space, and a second jet type fine bubble generation box for discharging the second fine bubble-containing fluid containing the fine bubbles generated by the vortex. A fine bubble generator. In the fine bubble generator of Claim 1,
A third nozzle having an injection port for introducing the second fine bubble-containing fluid discharged from the second jet type fine bubble generation box and jetting the fluid into the third internal space; A cavitation of the second fine bubble-containing fluid injected into the space, and a third jet type fine bubble generation box for discharging the third fine bubble-containing fluid containing the fine bubbles generated by the vortex. A fine bubble generator. In the fine bubble generator of Claim 1 or 2,
The first nozzle is
A liquid guiding path for guiding the pressurized liquid to the ejection port;
A fine bubble generating apparatus comprising: a gas guiding path for guiding gas to the injection port by the negative pressure of the liquid. In the fine bubble generator of Claim 3,
The liquid guide path is formed at the axis of the first nozzle;
The gas guide path is formed in an annular shape on the outer periphery of the liquid guide path, and the gas guide path and the liquid guide path merge at the injection port. In the fine bubble generator of Claim 1 or 2,
The pump is
It is a gas-liquid mixing pump which mixes gas with the said liquid and discharges a gas-liquid mixed fluid. The microbubble generator characterized by the above-mentioned. In the fine bubble generator of Claim 5,
The first nozzle is
A liquid guiding path for guiding the pressurized gas-liquid mixed fluid to the ejection port;
A fine bubble generating device comprising: a gas guiding path for guiding gas to the injection port by a negative pressure of the gas-liquid mixed fluid. In the fine bubble generator of Claim 6,
The liquid guide path is formed at the axis of the first nozzle;
The gas guide path is formed in an annular shape on the outer periphery of the liquid guide path, and the gas guide path and the liquid guide path merge at the injection port.

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