JP2009254950A - Fine bubble generating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique which enables generation of fine bubbles and causes to-be-washed objects to be separated and floated on the surface of water. <P>SOLUTION: The cleaning effects and physiological activities in the human body associated with generation of fine bubbles are excellent, while chemical contamination occurring in industries, especially manufacturing industries, having used many industrial chemicals cannot be prevented. When ensuring only a sufficient pressure and sufficient amount of water, without addition of anything to water or removal of anything from water, the technique generates fine bubbles and causes to-be-washed objects to be separated and float on the surface of water. When used in health purposes, the impact of breaking fine bubbles has effects on improvement of blood circulation, etc. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

This technology mixes fine bubbles in a liquid fluid.

Along with the development of civilization, the daily necessities of water are consumed in large quantities in every scene, and water is often used for cleaning purposes because it has the property of being easily combined with all substances. Daily chemical bathing, body washing by shower, disposal into sewage by stool, washing by production of industrial products, daily consumption in most homes, and many cleaning chemicals It is also true that the compound is used.

Various methods such as a method of diffusing bubbles with a mechanical high-speed rotating body, a swivel cutting method that rotates water flow at high speed, a method of making bubbles fine by dividing bubbles with ultrasonic waves, a pressure dissolution method, etc. Is implemented and utilized as a microbubble technology, but it seems that a relatively large apparatus for generating fine bubbles is a major factor.
Bernoulli's law Henry's Law Application of Venturi tube Coulomb's law

Although microbubble generation technology is being actively used in various water treatment, aquaculture, and cleaning fields as microbubble technology, it seems that the device for generating microbubbles is relatively large.

In most of the generation mechanisms accompanying the generation of microbubbles, it is necessary to finely adjust the atmosphere to be introduced from the outside and intake air, and if the amount of inhaled gas is excessive, only huge bubbles that are far from the microbubbles are generated. It is.

Taking tap water supplied from the public as an example, the minimum water pressure in ordinary households is 1.7 kg / square centimeter or more. Assuming that four locations are installed as taps, 17 liters per minute is supplied around the bath and other taps are supplied with 12 liters or more of tap water per minute. In this apparatus, by supplying 4 liters or more of water per minute, the desired fine bubbles can be generated without satisfying the conditions of claims 1 to 4 and inhaling air from the outside.

The liquid flow path is applied by applying the principle that the pressure is reduced around the high-speed fluid derived from Bernoulli's law without the need for air intake like a general microbubble generator. By increasing the flow velocity inside, by arranging a tube-column-like structure with the upper part of a circle, square, triangle, etc. closed with a perpendicular or elevation angle to the flow in a liquid flow path with a sufficient flow velocity, It has a surface on the upstream side of the flow path as a flow path obstruction, and has an appropriate elevation angle on the downstream surface of the flow path with an appropriate elevation angle to the tube columnar structure to generate cavitation and negative pressure generated by cavitation. Is stored in the cavity including the structure opening, and the liquid fluid has a function of generating bubbles by a negative pressure higher than the vapor pressure in order to easily discharge the dissolved air, and is generated downstream of the structure. Controlling the mixed air bubbles in the liquid by generating the cavity resonance by ultrasound in a tube columnar structure within the cavity by Karman vortex. The fine bubbles generated by this device have a bubble diameter of about 70 microns, and the surface of the bubbles is charged with a negative potential due to static electricity generated by high-speed friction between the bubble generation nozzle and the bubbles, and is generally ionized. It becomes a state.

The fine bubbles generated by this apparatus are charged with a negative potential from the size of the bubble diameter of about 70 microns, and are generally in an ionized state. Negative ionization, if one molecule of free hydrogen is taken into account from the water molecule structure, OH ion becomes an active molecule and greatly affects various chemical changes such as surface activity. In addition, microbubbles having the same polarity according to Coulomb's law repel each other in proportion to the magnitude of the electric charge, so that the coalescence growth between the bubbles is small.

Although the fine bubbles generated by this apparatus can be controlled, the fine bubbles with a diameter of about 30 microns have a small buoyancy in water due to their volume, so that they have a long remaining time in water and adhere well to positive ions as counter electrons. Substances generally called dirt are said to have a strong positive ion tendency, and a large number of fine bubbles adhere to the periphery of the dirt due to the surface active action due to the negative ion tendency due to OH and the mutual attractive action due to the counter-electron. When the negative charge is neutralized and extinguished by the positive ions, a plurality of fine bubbles grow together and become a large buoyancy and free floating with the dirt.

The fine bubbles generated by this device are not the fine bubbles resulting from the intake of air from the outside, but the bubbles that are separated and mixed from the dissolved air. Therefore, the air that is the contents of the bubbles with the passage of time to return to the original state with the passage of time. Although the amount of bubbles is reduced by elution in the liquid, the size of the bubbles is reduced from microbubbles to nanosized bubbles.

The operation when the water pressure and the flow amount sufficient for the operation of the present invention are supplied in the inflowing water flow of FIGS. 2 and 14 will be listed in the embodiments using the round cavitation nozzles of FIGS.
2 and 14 When the inflowing water flow has sufficient flow volume and pressure and hits the cavitation nozzle surface in FIGS. 2 and 9, the inflowing water flow cannot secure a smooth flow channel. 9 Pass through the gap between the bottom of the cavitation nozzle and the side.

Due to the energy transfer phenomenon in Bernoulli's law as it passes, the flow rate and pressure are apparent from the pressure distribution measurement diagrams of FIGS. 7 and 8, and the flow velocity tends to clearly increase in the water flow velocity measurement diagram of FIG. Further, according to the same law, the vicinity of the high-speed fluid is clear from the pressure distribution measurement diagram of FIG. 2 and 9 Cavitation nozzle bottom In FIGS. 2 and 12, the water flow disturbed by FIGS. 2 and 9 is compressed according to the obstructed rate, and as a result of the flow velocity measurement result of FIG. By passing through the points shown in FIGS. 2 and 12, it is exposed to a large pressure change as shown in FIG.

Under normal atmospheric pressure, water is defined as 8.11 mg / L (saturated dissolved oxygen) of oxygen at 1 atm and 25 ° C, and the dissolved air content is about 30 ppm considering the atmospheric composition containing nitrogen. I think that. The flowing water that has passed through FIGS. 2 and 13 that has passed through the cavitation points in FIGS. 2 and 12 has passed through a large decompression environment, and as a result, the flowing water was in an environment similar to low-pressure boiling, and thus many bubbles are generated and retained. Further, the cavity in the cavitation nozzle shown in FIGS. 2 and 10 holds a larger negative pressure than the atmosphere.

As shown by the pressure distributions in FIGS. 7 and 8, the cavity in the cavitation nozzle in FIG. 2 and FIG. 10 is accompanied by the generation of the negative pressure and the water held in the cavity is sucked and removed by the generated negative pressure. Does not exist. If the flow velocity is constant, the cavity in the cavitation nozzle shown in FIGS. 2 and 10 maintains a constant negative pressure, so that the water flow containing bubbles in FIG. 2 and 13 contains almost constant bubbles under constant decompression conditions, and FIG. When compression and release are performed at 12 cavitation points, ultrasonic vibration is accompanied, and the vibration gives a large pressure fluctuation to the water flow by density modulation.

Since the given modulation gives the water flow characteristics as a dense traveling wave, the cavity in the cavitation nozzle in FIG. 2 · 10 is in a resonance state around 200 KHz. This result further pulverizes the bubbles contained in the water stream containing bubbles in FIG. 3 The variable chamber type cavitation nozzle can change the resonance frequency in FIGS. 2 and 10 provided in FIGS. In addition, the inflow water flow shown in FIGS. 2 and 11 passes through the gap between the cavitation nozzles shown in FIGS. 2 and 9 and the flow tube shown in FIGS. 2 and 14 as high-speed water flow, but after passing through the side walls of the cavitation nozzles shown in FIGS. Forms the Karman vortex.

As shown in the flow velocity measurement chart of Fig. 6, the passing water has a high Reynolds coefficient for Fig. 2 and 16 Karman vortices generated behind the cavitation nozzles of Figs. At the stage of exceeding, the high-speed water flow becomes a peeled state that does not follow the cylinder surface after the maximum diameter, and the foaming phenomenon in accordance with Henry's law occurs at this location as the dissolved air is saturated under reduced pressure. Further, by changing the shape of the cavitation nozzle shown in FIG. 2 or 9 in FIG. 4 or FIG. 5, the amount of foaming generated on the side of the cavitation nozzle in FIG. Microbubbles that are drawn into the Karman vortex of high Reynolds along with the bubbling phenomenon are drawn to the center of the Karman vortex, but the water flow containing bubbles in FIG.

In addition, when the diameter of the fine bubbles is smaller than about 70 microns, the surface of the fine bubbles becomes charged due to the influence of intermolecular friction, and the charge charged on the surface of the fine bubbles is related to the size of the fine bubbles. It is said that it is almost constant minus 70 mV. When the surface of the fine bubbles is charged, the same electric field is repelled by Coulomb's law, and the fine bubbles do not grow together until the charge is lost. In addition, the phenomenon that water molecules are negatively charged is easily the result of detachment of one hydrogen molecule from the water molecule if the basic structure of the water molecule is two hydrogen molecules and one oxygen molecule. In addition, one molecule of residual hydrogen and one molecule of oxygen exist as deficient electron pairs and exist as OH molecules, which act as hydroxyl groups and have sea surface activity. In fact, it was confirmed experimentally that the cleaning ability was higher than that of normal water.

The presence of a negatively charged hydroxyl group in general water means that if a positive charge is present rather than a fine bubble, an attractive force acts between the existing charges according to Coulomb's law in order to keep the molecule stable. Be drawn to what you have. Due to the minute volume of the microbubbles themselves, the amount of gas contained is extremely small and does not have large buoyancy, resulting in a long remaining time in water.However, if neutralization of charged charges occurs, the repulsive force between the same charges according to Coulomb's law is It cancels out and coalesced growth of fine bubbles occurs. As the surface volume increases, the amount of encapsulated gas increases and a large buoyancy is generated to rise on the water surface.

The microbubbles generated by applying a large pressure and pressure reduction to the dissolved air volume without supplying the air from outside are present in the water where the dissolved air volume in the water has temporarily decreased. Slightly early. This tells us that the microbubbles usually referred to shrink quickly. When microbubbles shrink, they are in the form of ultrafine bubbles called nanobubbles, and the encapsulated gas is extremely compressed for a very long time.

Extremely small size foam has a great cleaning power, peels off fixed dirt, etc., and cleans and activates the skin for health, so it can be used in daily life and industry without polluting the natural environment. It seems to be a valuable bubble activation method.

Nozzle cross section Cavitation, Karman vortex generation diagram Variable chamber Nozzle parallel groove Nozzle thread groove Water flow velocity measurement diagram Overall pressure distribution measurement diagram Partial pressure measurement diagram

Explanation of symbols

1 Round cavitation nozzle
2
Cross section of round cavitation nozzle
Three
Square cavitation nozzle
Four
Cross section of square cavitation nozzle
Five
Triangular cavitation nozzle
6
Triangular cavitation nozzle cross section
7
Elliptical cavitation nozzle
8
Oval cavitation nozzle cross section
9
Cavitation nozzle
Ten
Cavitation nozzle cavity
11
Inflow water flow
12
Cavitation point
13
Bubble-containing water flow
14
Running water bottle
15
Runoff water flow
16
Karman vortex
17
Cavitation nozzle cavity variable rod
18
Rod adjustment screw
19
О Ring 1
20
О Ring 2
twenty one
Nozzle parallel groove
twenty two
Nozzle thread groove

Claims (5)

By placing a tube-shaped structure with a closed top such as a circle, square, triangle, or ellipse perpendicular to the flow or at an elevation angle in a liquid channel with sufficient flow velocity, the surface is placed upstream of the channel. It has a channel obstruction, has an appropriate elevation angle on the channel orthogonal plane downstream of the channel, has an opening surface in the tubular columnar structure, and generates cavitation, and the structure opening due to the negative pressure generated by cavitation The liquid fluid accumulated in the cavity containing the liquid has a function of generating bubbles by a negative pressure higher than the vapor pressure in order to easily discharge the dissolved air, and in the tubular columnar structure cavity by the Karman vortex generated downstream of the structure A fine bubble generator by controlling bubbles mixed in liquid by generating cavity resonance by ultrasonic waves. Separating action of liquid fluid from the wall of the structure by providing a plurality of parallel or inclined grooves for promoting the rectifying action on the outer surface of the tubular columnar structure closed at the top of the circle, square, triangle, etc. described in claim 1 A structure that enables the control of the desired diameter and the amount of fine bubbles by means of multiple simultaneous cavitation and three-dimensional generation of Karman vortices. The diameter of the desired fine bubbles and the amount of the generated microbubbles by the three-dimensional generation of Karman vortices, a plurality of simultaneous cavitations performed by the pipe columnar structure opening surface described in claims 1 and 2, a plurality of parallel or inclined grooves A structure in which a screw groove is provided on the outer surface of a tubular columnar structure as a means for controlling the diameter and generation amount of fine bubbles obtained by rotating a structure that allows control. Changed by the solid moving through the inner cylinder as a means for changing the volume in the cavity including the opening of the structure obtained by the tubular columnar structure having the upper part of the circle, square, triangle, etc. closed according to claim 1 A structure in which the volume to be produced changes the diameter of the fine bubbles obtained by changing the resonance frequency of the generated ultrasonic waves. Explosive gas in a water treatment apparatus using the technology of claims 1 to 3, separation of filth by surface active action utilizing fine foam surface charge, oil / water separation, bathing and bathing addition by surface active action utilizing fine foam surface charge Items used for equipment, body washing equipment, washing equipment, cleaning business equipment, aquaculture business using saturated dissolved oxygen content, etc.