WO2021020310A1 - ファインバブル発生装置及び水処理装置 - Google Patents

ファインバブル発生装置及び水処理装置 Download PDF

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Publication number
WO2021020310A1
WO2021020310A1 PCT/JP2020/028588 JP2020028588W WO2021020310A1 WO 2021020310 A1 WO2021020310 A1 WO 2021020310A1 JP 2020028588 W JP2020028588 W JP 2020028588W WO 2021020310 A1 WO2021020310 A1 WO 2021020310A1
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WIPO (PCT)
Prior art keywords
orifice
diameter
fine bubble
water
fine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/028588
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English (en)
French (fr)
Japanese (ja)
Inventor
芳樹 柴田
厚次 花村
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Shibata Corp
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Shibata Corp
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Filing date
Publication date
Application filed by Shibata Corp filed Critical Shibata Corp
Priority to CN202080033572.3A priority Critical patent/CN113853357A/zh
Priority to US17/606,383 priority patent/US20220242754A1/en
Priority to KR1020217036113A priority patent/KR102773394B1/ko
Priority to EP20845663.2A priority patent/EP4005654A4/en
Priority to KR1020257005736A priority patent/KR20250034175A/ko
Publication of WO2021020310A1 publication Critical patent/WO2021020310A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • B01F23/2375—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm for obtaining bubbles with a size below 1 µm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B01F25/4335—Mixers with a converging-diverging cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/005—Mixing or agitating manure, dung
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/06—Mixing of food ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/21—Mixing of ingredients for cosmetic or perfume compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/22—Mixing of ingredients for pharmaceutical or medical compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/305—Treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/4505—Mixing ingredients comprising detergents, soaps, for washing, e.g. washing machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/48—Mixing water in water-taps with other ingredients, e.g. air, detergents or disinfectants
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/26—Reducing the size of particles, liquid droplets or bubbles, e.g. by crushing, grinding, spraying, creation of microbubbles or nanobubbles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a fine bubble generator and a water treatment device.
  • Patent Document 1 and Patent Document 2 disclose a fine bubble generator that projects a columnar portion into an orifice of a tubular main body portion and generates nano-order fine bubbles in a water flow passing through the orifice.
  • tap water is introduced into this fine bubble generator, the water flow is throttled by the throttle portions formed between the opposing columns, and the flow velocity thereof increases.
  • a negative pressure region is formed in the throttle portion (and its downstream side) according to Bernoulli's principle, and the dissolved gas in the water is precipitated by the cavitation (decompression) effect to generate fine bubbles.
  • a small diameter portion may be simply provided on the tubular member (Patent Document 3). That is, an inlet portion whose inner diameter gradually narrows from the inlet side end portion of the tubular member toward the center portion, an orifice connected to this inlet portion, and an orifice connected to this orifice portion toward the other end on the outlet side of the tubular member.
  • a micro-order fine bubble can be formed by a device having an enlarged diameter portion whose inner diameter gradually increases.
  • the present invention has been made to achieve the above problems, and is defined as follows. That is, A tubular fine bubble generator with an orifice A fine bubble generator in which a recess is formed in the peripheral wall of the outlet of the orifice.
  • the orifice refers to a portion of the tubular member that has a reduced diameter and a predetermined length.
  • an inlet portion and an outlet portion (diameter expansion portion) having a diameter larger than that of the orifice are continuous on the inlet side and the outlet side of the orifice, respectively.
  • the orifice preferably has a flat inner peripheral surface of the same diameter to stabilize the flow.
  • the diameter of the orifice can be arbitrarily designed in relation to the desired compression ratio (relative to the fluid) and the amount of fluid processed. In order to exert the cavity effect, it is important to adjust the difference between the diameter of the orifice outlet and the diameter of the subsequent enlarged diameter portion.
  • the length of the orifice can be arbitrarily designed as long as the fluid flowing through the orifice is stable, that is, if the flow is aligned in the axial direction thereof.
  • the diameter of the orifice is not limited to being uniform in the axial direction.
  • the diameter of the orifice can be changed sequentially, and a spiral groove can be formed on the inner peripheral surface thereof.
  • the inlet portion leading to the orifice is sequentially reduced in diameter toward the orifice. This is to smoothly introduce the fluid into the orifice. As a result, the fluid can be sufficiently compressed while ensuring a high flow velocity.
  • the degree of diameter reduction (inclination angle with respect to the axial direction) can be arbitrarily selected according to the type of fluid, the flow velocity, and the desired compressibility.
  • the inner peripheral surface of the inlet portion is preferably a flat surface, but a spiral groove or the like can be provided inside the flat surface.
  • the diameter-expanded portion following the orifice outlet is larger than the diameter of the orifice outlet.
  • the difference (ratio) between the diameter of the outlet of the orifice and the maximum diameter of the enlarged diameter portion is arbitrarily designed according to the average particle size of the fine valve to be obtained, the number of particles, and the like.
  • micro-order fine bubbles are formed by releasing the fluid compressed by the orifice at the enlarged diameter portion to create a negative pressure (see Patent Document 3).
  • the fine valve to be formed can be nano-ordered without providing any column portion in the orifice. Since the column portion can be omitted, the resistance in the orifice is reduced and the amount of fluid that can be processed increases. In addition, since the structure is simplified, manufacturing becomes easy and durability and maintainability are improved.
  • the recesses are evenly distributed in the circumferential direction and the radial direction with the center of the orifice as the center of the peripheral wall at the outlet of the orifice. This is to stably form fine bubbles.
  • the peripheral wall at the outlet of the orifice is formed in the direction perpendicular to the axis of the orifice, and the depth direction of the recess formed therein is the same as the axis of the orifice.
  • This recess has the same diameter in the depth direction from the portion that opens to the peripheral wall, or the diameter is reduced in the depth direction. This is to prevent the fluid from staying in the recess. Further, from the viewpoint of moldability (easiness of die cutting), it is preferable to form the concave portion as described above.
  • the shape of the recess is arbitrary.
  • the recess can be drilled so as to move away from or closer to the orifice as the recess becomes deeper. It is preferable that the distance from the outlet peripheral edge of the orifice to the peripheral edge of the recess (the gap between the two) is closer. However, if it is brought too close, the wall thickness at the periphery of the outlet becomes too thin and mechanical strength cannot be secured. According to the study by the present inventors, when the device is made of resin, the distance between the two is 0.1 mm or more.
  • the peripheral wall of the outlet of the orifice is in the direction perpendicular to the central axis of the orifice.
  • Ratio of orifice diameter to diameter of enlarged diameter Recessed aspect ratio Velocity of fluid discharged from the outlet of the orifice and its viscosity Ratio of the area of the recess to the peripheral wall of the orifice Distance between the periphery of the outlet of the orifice and the periphery of the recess The ratio of the area of the outlet of the orifice to the area of the recess, etc.
  • the orifice is not particularly limited as long as it has a shape that narrows and compresses the water flow sent from the entrance and accelerates the flow velocity, but from the viewpoint of minimizing the resistance to the water flow, it may be provided with a space having a circular cross section. preferable.
  • the diameter of the orifice can be arbitrarily selected according to the amount of water to be treated and the like. To obtain such a flow rate, the flow rate, pressure, and texture (material, surface roughness) of the inner peripheral surface of the orifice are adjusted. In order to stabilize the flow velocity, it is preferable to provide a portion having the same diameter (straight pipe portion).
  • the length of the straight pipe portion is preferably 0.5 to 2.0 times, more preferably 1.0 to 1.5 times the length of the outlet diameter of the orifice.
  • a large diameter portion is formed on the downstream side of the orifice, and water that has passed through the orifice is discharged to this large diameter portion. As a result, the water flow compressed by the orifice is released and its pressure is reduced. Bubbles will be formed by the cavity effect resulting from such decompression.
  • the enlarged diameter portion following the outlet of the orifice is preferably circular in cross section, and the central portion thereof coincides with the center of the orifice.
  • the fluid discharged from the outlet of the orifice is evenly diffused and depressurized. Therefore, fine bubbles are evenly formed.
  • the peripheral wall of the outlet of the orifice is perpendicular to the axis of the orifice, and as a result, the enlarged diameter portion becomes cylindrical with a uniform diameter from the periphery of the outlet of the orifice.
  • the recess is brought close to the orifice outlet to obtain a larger negative pressure and a suitable negative pressure cycle.
  • the shape of the inner peripheral surface of the diameter-expanded portion can be arbitrarily designed, and for example, the diameter-expanded portion continuous with the outlet of the orifice can be formed into a reverse funnel shape in which the diameter is sequentially expanded as the distance from the outlet increases.
  • the pressure of the recess formed in the peripheral wall of the orifice outlet is 1/10 to 1/100 of the pressure at the center of the enlarged diameter portion. Since the pressure value cannot be measured directly, the simulation result of the water flow simulation software (Simulation manufactured by SolidWorks) is adopted. See FIG. 4 for specific simulation results.
  • the density of the fluid decreases in the recess having such a negative pressure, and the fluid becomes almost in a gaseous state. It is considered that fine bubbles are formed when the fluid in the recess in the gaseous state is entrained in the fluid in the liquid state. Then, the fluid flowing through the enlarged diameter portion and the vaporized fluid in the recess interfere with each other, and the negative pressure in the recess changes periodically. It is considered that the fine bubble could be nano-ordered by the combination of the frequency of this change and the magnitude of the negative pressure in the recess.
  • the peripheral wall of the enlarged diameter portion may be provided with a second recess continuously or discontinuously in the circumferential direction.
  • the generation of the fine valve can be promoted also in this second recess.
  • the pressure in the second recess shall be greater than the pressure in the first recess formed around the outlet of the orifice and smaller than the center of the enlarged diameter portion.
  • the second recess on the peripheral wall of the enlarged diameter portion agitates the fluid flowing through the enlarged diameter portion. As a result, the cavity effect in the first recess is promoted. From the standpoint of stirring, the second concave portion can be replaced with a convex portion.
  • the fine valve generator of the present invention once a fluid such as water is passed through it, a large amount of nano-order fine bubbles can be generated there.
  • the fluid that has entered the recess takes on the gas phase property in the recess.
  • the properties of the fluid itself may change. For example, although it cannot be measured, it is possible that so-called fluid clusters are destroyed. In other words, the smaller the cluster, the greater the permeability of the fluid itself.
  • the nanobubble water obtained by the present invention has the same surface tension as ordinary water.
  • nanobubble water which is a method of micronizing the bubbles of air supplied to water by mechanical stirring or applying pressure from the outside, has a small surface tension and is easily wetted with a partner substance.
  • the fine bubble water produced by the fine bubble generator of the present invention has novel characteristics in itself. Therefore, in another aspect of the present invention, fine bubbles are removed from the fine bubble water obtained by the method described above. Even in the absence of fine bubbles, the water treated by the fine bubble generator of the present invention has novel properties.
  • ultrasonic waves are applied so that the nano-order fine bubbles grow on the microphone loader, and then the micro-ordered fine bubbles disappear spontaneously. It is not limited to removing all the fine valves from the fine bubble water, but it is also possible to remove any part of the fine valves.
  • the fine bubble water obtained by passing through the fine bubble generator of the present invention has a high cleaning ability even as it is, and other general functions provided by the fine bubble water.
  • the fluid that passes through this fine bubble generator is not limited to tap water. That is, any device that can pass through the fine bubble generator and can generate negative pressure without blocking its orifice or recess is sufficient. Not only pure water and deionized water, but also polluted water and seawater can be targeted. Furthermore, alcohol, gasoline, diesel oil and the like can also be targeted.
  • Such fine bubble water can also be used as a raw material such as a cleaning material, a bactericidal agent against viruses and bacteria, a disinfectant material, a pharmaceutical material, a food material, a decorative material, a building material, a civil engineering agent, a fertilizer material, and an emulsion solvent. ..
  • water obtained by removing fine bubbles from this fine bubble water can also be used as a raw material for cleaning agents, disinfectants, disinfectants, pharmaceutical materials, food materials, cosmetic materials, building materials, civil engineering agents, fertilizer materials, emulsion solvents, and the like. sell.
  • FIG. 1 is a cross-sectional view of the fine bubble generator according to the embodiment of the present invention.
  • FIG. 2 is also a front view seen from the exit side.
  • FIG. 3 is a chart showing the measurement results of the apparatus of FIG.
  • FIG. 4 also shows the simulation results.
  • FIG. 5 is a cross-sectional view of the fine bubble generator of another embodiment.
  • FIG. 6 is a chart showing the measurement results of the apparatus of FIG.
  • FIG. 7 is a cross-sectional view of the fine bubble generator of another embodiment.
  • FIG. 8 is a chart showing the measurement results of the apparatus of FIG. 7.
  • FIG. 9 is a cross-sectional view of the fine bubble generator of another embodiment.
  • FIG. 10 is a chart showing the measurement results of the apparatus of FIG.
  • FIG. 11 is a chart summarizing the results of FIGS. 3, 6, 9, and 10 on the same scale.
  • FIG. 1 is a cross-sectional view showing the structure of the fiberable generator 1 according to the embodiment of the present invention.
  • the fine bubble generator (hereinafter, may be simply referred to as a "generator”) 1 includes an inlet portion 10, an orifice 15, a diameter-expanded portion 20, and a recess 40 in a tubular housing 3.
  • the tubular housing 3 is composed of three pieces 4, 5 and 6, and a fitting hole 7 is formed on one end side (left side in the drawing) of the first piece 4, and the fitting hole 7 is flat.
  • the bottom surface (the peripheral wall 8 of the opening of the orifice 15) is provided.
  • the second and third pieces 5 and 6 are penetrated into the fitting hole 7 without any gap.
  • An inlet portion 10 formed in a conical shape is formed at the other end (left side in the drawing) of the first piece 4, and is connected to the orifice 15.
  • the orifice 15 is a through hole having the same radius and opens into the fitting hole 7.
  • the orifice 15 and the inlet 10 have their centerlines aligned with the centerline of the first piece 4.
  • a first recess 40 is formed on the bottom surface of the fitting hole 7, that is, on the peripheral wall 8 at the outlet of the orifice 15.
  • the first recess 40 is radially opened in the peripheral wall 8 with an interval of 90 degrees in the circumferential direction about the center of the outlet of the orifice 15.
  • the opening of the recess 40 has a rectangular shape (oval shape) with rounded corners. Then, it is bored in parallel with the orifice 15 while maintaining the shape of this opening.
  • the second piece 5 is a disk-shaped member that fits into the fitting hole 7, and a first diameter-expanded portion 21 continuous with the orifice 15 is formed.
  • the first diameter-expanded portion 21 forms a second recess 23 by sequentially expanding its diameter from around the center of the second piece 5.
  • the second recess 23 is continuously formed in the circumferential direction of the inner peripheral surface of the second piece 5, but this can also be intermittent.
  • the disk-shaped third piece 6 is fitted into the fitting hole 7 so as to be overlapped with the second piece 5.
  • a second diameter-expanded portion 25 is formed on the third piece 6, and in combination with the first diameter-expanded portion 21 of the second piece 5, the diameter-expanded portion 20 as the fine valve generator 1 is formed.
  • the first diameter-expanded portion 21 and the second diameter-expanded portion 25 have the same diameter, but the diameter of the second diameter-expanded portion 25 is made larger than that of the first diameter-expanded portion 21. May be good.
  • All of the three pieces 4, 5 and 6 constituting the tubular housing 3 can be formed of synthetic resin. Of course, it can also be formed of metal or ceramics.
  • all the first recesses 40 are exposed in the first diameter-expanded portion 21.
  • the first recess 40 may be expanded in the radial direction on the peripheral wall 8 so that when the second piece 5 is fitted, a part thereof is covered with the second piece 5.
  • the first recess 40 is preferably formed radially around the center of the outlet of the orifice 15, and is not limited to the four directions shown in FIG. 2, and can be arbitrarily formed in the range of, for example, 3 to 12. It is preferable that each of the first recesses 40 when viewed from the center of the outlet of the orifice 15 is evenly distributed in the circumferential direction and the radial direction.
  • the tubular housing 3 is made of ABS resin.
  • Cylindrical housing 3 Diameter 12.0 mm, length: 10 mm Opening diameter at the entrance: 8.0 mm Opening angle of the inclined surface at the entrance: 90 degrees Orifice 15 diameter: 0.9 mm Orifice 15 length: 1.0 mm
  • Vertical width of the first recess 40 0.7 mm Width of the first recess 40: 0.4 mm
  • Depth of first recess 40 0.5 mm Distance between orifice 15 and first recess 40: 0.1 mm
  • Inclination angle of the second recess 23 90 degrees Width of the second recess 23: 0.75 mm
  • Fitting hole 7 Diameter 10 mm, depth 4.0 mm Thickness of 3rd and 4th pieces: 2.0mm each
  • Tap water is introduced into the inlet side of the fine bubble generator 1 configured in this manner at a pressure of 2.0 MPs, water discharged from the diameter-expanded portion 20 side is collected, and the particle size of the fine bubbles contained therein is collected.
  • the distribution was measured using SALD-7500H manufactured by Shimadzu Corporation. The results are shown in FIG.
  • the average particle size is 93 nm, and the number of nano-order fine bubbles per ml exceeds 370 million. There were few micro-order fine bubbles.
  • a simulation of the water flow of this example is shown in FIG. In FIG. 4, the flow velocity is indicated by the shade of the arrow. The lighter the color of the arrow, the faster the flow velocity.
  • the pressure in the enlarged diameter portion was 31.7 kPa, while the pressure in the first recess was 2.1 kPa and the pressure in the second recess was 2.9 kPa.
  • FIG. 11 summarizes the results of FIGS. 3, 6, 8 and 10 on the same scale. From the result of FIG. 11, it can be seen that the particle size of the generated fine bubbles becomes smaller by providing the first recess and the second recess. It can be seen that by coexisting the first recess and the second recess, the particle size of the generated fine bubbles becomes remarkably small, and as a result, the number of fine bubbles generated also remarkably increases.
  • a fine valve generator in which an inlet portion whose diameter is gradually reduced from the inlet of a tubular main body, an orifice continuous with the inlet portion, and a diameter expansion portion continuous with the orifice portion are sequentially formed.
  • the boundary between the orifice and the enlarged diameter portion is a radial elevation.
  • the diameter of the enlarged diameter portion is 3 to 10 times the diameter of the orifice.
  • a fine bubble generator in which the enlarged diameter portion is released only at its outlet.
  • the boundary between the orifice and the enlarged diameter portion corresponds to the outlet peripheral wall of the orifice.
  • the outlet peripheral wall is preferably perpendicular to the axis of the orifice, but may be tilted by ⁇ 20 degrees or ⁇ 10 degrees from the vertical.
  • the diameter-expanded portion side is + and the inlet side is-. If the inclination of the outlet peripheral wall exceeds +20 degrees, the stirring and mixing of the bubbles formed by the cavity effect becomes insufficient. On the other hand, if the inclination of the outlet peripheral wall exceeds ⁇ 20 degrees, the water flow discharged from the orifice is attracted to the inclined outlet peripheral wall side, so that a sufficient flow velocity cannot be secured and the decompression becomes insufficient.
  • the enlarged diameter portion preferably has a uniform inner diameter, but it may have an inverted funnel shape within the above range. It is assumed that the enlarged diameter portion is released only at its outlet. In other words, no air or other gas is injected from the outside into the peripheral wall of the enlarged diameter portion. If the enlarged diameter portion communicates with the external environment other than its outlet, the decompression environment inside the enlarged diameter portion may be disturbed, which is not preferable.
  • the position where the second recess is formed is a position where the water flow discharged from the outlet of the orifice can be efficiently agitated. It can be arbitrarily designed according to the flow velocity, the ratio of the diameter of the orifice and the enlarged diameter portion, the shape of the enlarged diameter portion, and the like. According to the study by the present inventors, it is preferable to form the orifice in a range of 0.5 to 1.5 times the diameter of the enlarged diameter portion from the outlet of the orifice to the downstream side in the axial direction of the orifice.
  • a fine valve generator in which an inlet portion whose diameter is gradually reduced from the inlet of a tubular main body, an orifice continuous with the inlet portion, and a diameter expansion portion continuous with the orifice portion are sequentially formed.
  • a first recess that is evenly distributed in the circumferential direction and the radial direction with the center of the orifice as the center is formed on the radial elevation at the boundary between the orifice and the enlarged diameter portion.
  • a fine valve generator in which a second concave portion or convex portion is formed continuously or intermittently in the circumferential direction on the inner peripheral surface of the enlarged diameter portion.
  • a water flow compression portion having a peripheral wall for evenly compressing the water flow and a water flow release portion formed on the downstream side of the water flow compression portion and having a diameter larger than that of the water flow compression portion are provided, and the water flow release portion is provided with the water flow release portion.
  • a second recess is formed on the inner peripheral surface of the water flow release portion in the radial circumferential direction, the pressure in the second recess is larger than the pressure in the first recess, and the center of the water flow release portion is The water treatment apparatus according to (2), which is smaller than the pressure.
  • the inner peripheral surface of the water flow release portion has a concave portion continuous or intermittent in the circumferential direction.
  • Fine bubble generator 8 Peripheral wall of orifice outlet 10 Inlet part 15 Orifice 20 Diameter expansion part 23 Second recess 40 First recess

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Nanotechnology (AREA)
  • Dispersion Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Nozzles (AREA)
PCT/JP2020/028588 2019-07-26 2020-07-22 ファインバブル発生装置及び水処理装置 Ceased WO2021020310A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202080033572.3A CN113853357A (zh) 2019-07-26 2020-07-22 微泡产生装置及水处理装置
US17/606,383 US20220242754A1 (en) 2019-07-26 2020-07-22 Fine Bubble Generator And Water Treatment Device
KR1020217036113A KR102773394B1 (ko) 2019-07-26 2020-07-22 파인버블 발생장치 및 수처리장치
EP20845663.2A EP4005654A4 (en) 2019-07-26 2020-07-22 Fine bubble generator and water treatment device
KR1020257005736A KR20250034175A (ko) 2019-07-26 2020-07-22 파인버블 발생장치 및 수처리장치

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JP2019137478A JP6978793B2 (ja) 2019-07-26 2019-07-26 ファインバブル発生装置及び水処理装置
JP2019-137478 2019-07-26

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JP7164846B1 (ja) 2021-09-24 2022-11-02 株式会社ナノバブル研究所 微細気泡発生方法
WO2024090146A1 (ja) * 2022-10-24 2024-05-02 株式会社アクアソリューション 液体噴出装置
JP7316006B1 (ja) 2022-12-19 2023-07-27 アクアソリューションズ株式会社 流体混合装置
JP7725118B2 (ja) * 2023-07-24 2025-08-19 株式会社シバタ ガス溶解方法

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JP2022010118A (ja) 2022-01-14
US20220242754A1 (en) 2022-08-04
KR20210148314A (ko) 2021-12-07
CN113853357A (zh) 2021-12-28
JP2023171586A (ja) 2023-12-01
JP2025163258A (ja) 2025-10-28
EP4005654A1 (en) 2022-06-01
EP4005654A4 (en) 2023-09-27
JP2021020153A (ja) 2021-02-18
JP6978793B2 (ja) 2021-12-08
JP7731149B2 (ja) 2025-08-29
KR20250034175A (ko) 2025-03-10
KR102773394B1 (ko) 2025-02-26

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