JP2002186840A - Fine bubbles production method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical method and device, with a simple structure, for producing fine bubbles capable of producing the fine bubbles by feeding a reduced pressure air and automatically controlling the fine bubbles by a pressure. SOLUTION: In the production method for fine bubbles, a water stream absorbed at a water absorption part 2 is fed to a discharge part 3, at that time, a reduced pressure air 62 is fed to a water feed stream 9 to form fine bubbles 8 in the water feed stream and the bubble stream is sprayed out from the discharge part 3. In the production method, it is characterized that a size of the bubble is freely varied by adjusting an air pressure 62a fed to the water stream. This device has an air suction hole 6 and an air chamber 4 concentrically and sealingly covering an outer periphery of an annular pipe with an annular cylinder on an annular pipe wall of a nozzle body part and has an air introduction port 7 on the air chamber. A pressure sensor 13 and an air adjustment member 10 are connected to the air chamber 4 in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for generating fine air bubbles and an apparatus for generating fine air bubbles, and more particularly to a method for purifying water quality in a closed water area and automatically controlling the fine air bubbles. The present invention relates to a method and an apparatus for producing microbubbles which can be made, have a simple structure and are economical.

[0002]

2. Description of the Related Art In recent years, with the development of industry, the population has been concentrated in urban areas, and the water quality environment of rivers, ponds, lakes and marshes in urban areas has deteriorated due to domestic wastewater. Ponds, lakes and marshes in the middle are also concerned with water quality conservation. In particular, the degree of water quality deterioration in closed water areas such as ponds and lakes is also remarkable. Also, dead leaves and other organic substances flow into artificially created aquaculture ponds, ponds, other ponds provided in golf courses, and closed water areas such as lakes and marshes. Further, in closed water areas such as lakes and marshes close to the living area, water quality is polluted by the inflowing domestic wastewater, and there is a problem that blue water and the like are generated. In particular, in aquaculture ponds, it is necessary to purify the quality of aquaculture water, and as one means, install a stirrer on the pond and stir the water surface to forcibly contact water and air.
The water quality is purified by so-called aeration.

[0003] In such a situation, means for improving the oxygen dissolution rate by jetting fine bubbles into water is disclosed in Japanese Patent Laid-Open No. 5-1 / 5-1.
No. 61899. It has no driving unit in the water, and consists of a nozzle body that supplies high-pressure fluid from the tangential direction as a means for ejecting bubbles into the water, and of the nozzle body, one of the suction pipe side ends is provided. The nozzle hole is directed to the suction pipe side for washing,
This is an aeration device characterized by all other nozzle holes facing the discharge pipe side, whereby the swirling and jetting air flow agitates and aerates the air. Water can be agitated without the presence of water, sufficient contact with fine bubbles can be achieved, and a water flow can be generated in the pond, so that uniform aeration and agitation can be achieved.

[0004]

However, in the means using the stirrer as described above, a screw is arranged on the water surface or in water, and the screw is rotated by a power motor. There is a problem that the driving part is liable to break down due to water or impurities in the water, and it is necessary to perform periodic inspection and maintenance. Also, Japanese Patent Application Laid-Open
In the aeration apparatus described in JP-A-161899, as a means for ejecting air bubbles into water, each nozzle body A is supplied to each nozzle body A from a tangential direction at a predetermined high pressure with air or water containing air. Air or the like is introduced as a swirling flow into the concave groove, and high-pressure air or the like is ejected from the nozzle hole 3 while rotating in a ring shape. Therefore, since the air bubbles jetted into the flowing water in the main body are in a high pressure state, they have a problem that they expand and become large and it is difficult to generate fine bubbles.

Accordingly, the present inventors have conducted various studies on the above-mentioned problems, and as a result, although having provided a driving device for jetting water, the air supplied to the water stream was reduced in pressure to reduce bubbles. Since the pressure of the flowing water near the nozzle port is lower than the air pressure, the air is sucked in and mixed with the water flow to form fine bubbles. Furthermore, the pressure is automatically controlled to control the diameter of these fine bubbles, and the structure is simple.
In addition, it has been found that an economical method and apparatus for producing fine bubbles can be obtained. Therefore, the problem to be solved by the present invention is to generate microbubbles by supplying decompressed air, and to automatically control them by pressure, which is simple and economical. An object of the present invention is to provide a method and an apparatus for generating bubbles.

[0006]

The above object of the present invention is achieved by the inventions described in claims 1 to 21 below.

[Claim 1] The water stream absorbed by the water absorption section is sent to the discharge section, and at this time, depressurized air is supplied to the water supply stream to form bubbles in the water supply stream and discharge the bubble stream. A method for generating fine bubbles, wherein the size of the bubbles is freely changed by adjusting an air pressure supplied to the water stream. [2] The method of generating fine bubbles according to [1], wherein the sucked water flow is sent while being swirled to a discharge portion, and air is supplied in the swirling direction of the water flow. . (3) The method for producing fine bubbles according to (1) or (2), wherein the suction of air is performed from a plurality of locations in one air chamber. [4] The method for producing fine bubbles according to any one of [1] to [3], wherein a plurality of air chambers for sucking air are provided. [5] The method for producing fine bubbles according to any one of [1] to [4], wherein the water supply means is a fan type. [6] The method for producing fine bubbles according to any one of [1] to [4], wherein the water supply means is a pump. (7) The method for producing fine bubbles according to any one of (1) to (6), wherein the air adjusting means is a cock. [8] The method for producing fine bubbles according to any one of [1] to [6], wherein the air adjusting means is a valve. (9) The method for producing microbubbles according to any one of (1) to (8), wherein the air jetting means is perpendicular to the water flow. (10) The method for producing microbubbles according to any one of (1) to (8), wherein the air blowing means has an angle with respect to the water flow. (Claim 11) In the microbubble generator comprising a water absorbing portion, a nozzle body portion and a discharge portion, the water absorbing portion comprises a skirt-shaped water absorbing tube having a wide end, and the nozzle body portion comprises an annular tube having the same diameter. A driving member is provided on the water-absorbing side of the annular pipe, and at least two air suction holes are provided in the annular pipe wall, and an outer peripheral portion of the pipe is concentrically sealed with an annular cylinder. The air chamber has a covered air chamber, and the air chamber has an air inlet. A pressure sensor and an air adjusting member are connected to the air chamber in this order, and the discharge unit has a tapered inner diameter in a discharge direction. The microbubble generator characterized by having expanded. [Claim 12] The microbubble generator according to claim 11, wherein the annular pipe has at least two air ejection holes in a tangential direction of a circumference. [13] The microbubble generation according to [11] or [12], wherein the water-absorbing portion is formed such that an annular pipe of the nozzle body is extended and formed at an angle with respect to the annular pipe direction. apparatus. [14] The microbubble generator according to any one of [11] to [13], wherein the air chamber has a plurality of air suction ports. [15] The microbubble generating device according to any one of [11] to [14], wherein a plurality of the air chambers are provided. [16] The microbubble generating device according to any one of [11] to [15], wherein the water absorbing member is a fan type. [17] The microbubble generating device according to any one of [11] to [15], wherein the water absorbing member is a pump. [18] The microbubble generator according to any one of [11] to [17], wherein the air adjusting member is a cock. (19) The microbubble generator according to any one of (11) to (17), wherein the air adjusting member is a valve. (20) The microbubble generator according to any one of (11) to (19), wherein the air inlet is perpendicular to the water flow. 21. The microbubble generator according to claim 11, wherein the air inlet has an angle with respect to the water flow.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited thereto.

In the invention according to the first aspect of the present invention, the water stream absorbed by the water absorbing section is sent to the discharge section, and at this time, depressurized air is supplied to the water stream to supply the water stream. In the method of forming microbubbles for forming bubbles in a water flow and ejecting the bubble flow from a discharge unit, the size of the bubbles is freely changed by adjusting the air pressure supplied to the water flow. I do. Here, the water flow absorbed by the water absorbing portion contains almost no air bubbles, but is sent by the fan, so that the water flow becomes a swirling flow, but it does not have to be a swirling flow. While the swirling flow is sent to the discharge unit,
By sucking air from the air chamber, fine bubbles are formed, and a swirling flow containing the bubbles is formed. According to a second aspect of the present invention, the sucked water flow may be supplied to the discharge section while being swirled, and at this time, air may be supplied in the swirling direction of the water flow.

In the invention according to the third aspect of the present invention, when inhaling air, the inhalation can be performed from a plurality of locations in one air chamber. Specifically, the number of the air chambers is preferably two to ten, but varies depending on the amount of air mixed. Further, in the invention according to the method for producing fine bubbles according to claim 4, a plurality of air chambers for sucking air are provided, and specifically, one to ten air chambers are preferable, but one to five air chambers are preferable. It is. The invention according to the method for producing fine bubbles according to claim 5 is preferable in that the water supply means can form a swirling flow by a fan type, and the water supply means may be a pump as described in claim 6. In this case, a turbulent flow or a swirling flow may be used in combination. In the invention according to the method for generating microbubbles of the present invention, the air pressure adjusting means may be a cock as described in claim 7 or a valve as described in claim 8. These air conditioning means are well known in this technical field, and can be appropriately selected and used. Further, in the ninth aspect of the present invention, the air suction hole is preferably formed at right angles to the water supply flow, but is preferably formed at an angle as described in the tenth aspect.

Further, the microbubble generator according to the present invention will be described. In the present invention, the size of the bubbles can be freely changed by adjusting the supply amount of the air, and the particle size of the fine bubbles is preferably adjusted in a range of 10 μm to 100 μm, more preferably. 20 μm to 50 μm
It is.

FIG. 1 is a sectional view schematically showing a microbubble generator according to the present invention. FIG. 2 shows the apparatus of FIG.
It is sectional drawing at the time of cutting along the line. In the microbubble generator I of the present invention shown in FIGS. 1 and 2, the nozzle body 1 having the fan 5 is formed of an annular tube having the same diameter.
Are provided with a plurality of air suction holes 6 (6a, 6b, 6c). The air suction holes 6 are further provided in a substantially tangential direction 61 with respect to the circumferential surface. Air is sucked into the water stream from the air suction holes 6a, 6b, 6c in the tube wall of the main body 1. The outer peripheral portion of the nozzle body 1 is concentrically sealed and covered with an annular tube 4 to form an air chamber 40. The air chamber 40 has an air inlet 7. The nozzle body 1 is provided at its end with a fan 5 driven by a driving member (not shown).
Further, the end portion has a water absorbing portion 2, which is formed of a water absorbing tube 2a having a wide water inlet. The nozzle 3 has a discharge section 3 on the discharge side of the nozzle body 1.
Is provided with a discharge port 3b whose inner diameter expands in a tapered shape, and in FIG. 1 is formed of a discharge pipe 3a which expands in a tapered shape.

In the method for generating micro-bubbles and the apparatus for generating micro-bubbles I of the present invention, the fan 5 drives the water by the driving member in the direction from the water-absorbing section 2 to the discharge section 3, and the water-supplying flow The swirling flow 9 is formed by the
Flows towards At this time, the swirling flow 9 receives air from the air suction holes 6a, 6b, 6c provided in the tangential direction, and the swirling flow 9 mixed with the air becomes the swirling flow 9 containing fine bubbles. From the discharge port 3a. The water in a closed water area such as a pond becomes water or a water stream containing fine bubbles due to the eruption. Therefore, by arranging the microbubble generator of the present invention around a plurality of ponds, it is possible to circulate the water flow in the ponds. The water flow may not be a swirling flow. In the present invention, the particle size of the fine bubbles is 10 μm to 10 μm.
It is preferable to adjust the thickness within a range of 0 μm, and more preferably 10 μm to 50 μm. More preferably, 20 μm
５０50 μm. The relationship between the air pressure and the bubble diameter can be determined by measuring the bubble diameter obtained by appropriately changing the air pressure by a test. In the present invention, the air inlet 7
The pressure sensor 13 and the control valve 10 are connected to control the size of bubbles. The pressure sensor 13 has a gauge pressure (c
mHg) are used. That is, after the air inlet is set to a predetermined size by the control valve 10, the pressure of the air in the air chamber 40 is detected by the pressure sensor 13, and the size of the bubble formed by the pressure is measured by the measuring device. This is done by experimentally determining the air pressure and bubble size.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention. In FIG. 3, the fine bubble generating device II of the present invention bends the water absorbing pipe 20 at a right angle to drive the driving member 5a.
It is characterized by the fact that the motor is installed outside the tube,
The nozzle body 1 and the discharge unit 3 have the same configurations as the nozzle body 1 and the discharge unit 3 of the microbubble generator shown in FIG. As is apparent from FIG. 3 of the microbubble generator II of the present invention, since the water absorption pipe 20 is bent at a right angle,
The motor of the driving member 5a can be installed outside the microbubble generator.

FIG. 4 is a cross-sectional view showing a microbubble generator according to still another embodiment of the present invention. FIG. 5 is a cross-sectional view when the nozzle body of FIG. 4 is cut along the line CD. FIG.
5 and FIG. 5, a microbubble generator III of the present invention is shown.
The air chambers 40 formed by the annular cylinder 4 provided in the nozzle main body 1 are individually provided as shown by reference numerals 41, 42, and 43, respectively.
By adjusting the air pressures of 2, 43, the particle size of the fine bubbles can be formed as desired. That is, in the microbubble generator III of the present invention shown in FIGS. 4 and 5, the nozzle body 1 having the fan 5 is composed of the same-diameter annular pipe 1, and a plurality of air suction holes 6 are provided around the annular pipe 1. (6a,
6b, 6c). The air suction pipe 6 is further provided in a substantially tangential direction 61 with respect to the circumferential surface, and the sucked air flows along the pipe wall of the nozzle body 1 in a swirling flow 9. Inhaled and mixed. The outer peripheral portion of the nozzle body 1 is concentrically sealed and covered with an annular cylinder 4 so as to surround the air suction holes 6a, 6b, 6c, respectively.
42 and 43 are formed. These air chambers 41, 4
2 and 43 have air introduction ports 71, 72 and 73, and air is introduced. In addition, these air inlets 7
The control valves 10, 11, 12 are connected to 1, 72, 73, and the air flow pipes 21, 22, 23 extending therefrom are
It joins one distribution pipe 24. Further, the control valves 10, 1
1 and 12 are connected to the pressure sensors 13, 14 and 15 by wiring. The air chamber 4 is controlled by these control valves 10, 11, and 12.
By changing the pressure of the air introduced into 1, 42 and 43 to a desired pressure, bubbles having different bubble diameters can be mixed. On the other hand, the nozzle body 1 has
A fan 5 is provided at an end, and further has a water absorbing portion 2 at this end, and the water absorbing portion 2 is composed of a water absorbing pipe 2a having a wide water inlet. In addition, the nozzle body 1 has a discharge portion 3 on the discharge side. The discharge portion 3 has a discharge port 3a whose inner diameter is tapered. In FIG. 4, the discharge port 3 is tapered. Discharge pipe 3a.

In the microbubble generator III of the present invention, water is sent from the water suction section 2 toward the discharge section by the fan 5. At this time, the water flow is controlled by the air suction holes 6 a, provided in the tangential direction 61. 6b and 6c generate air, and the swirling flow 9 mixed with the air forms a swirling flow 9 containing fine bubbles 8 therein.
And squirts from the discharge port 3a. The water in a closed water area such as a pond becomes water or a water stream containing fine bubbles due to the eruption. Therefore, by arranging the microbubble generator of the present invention around a plurality of ponds, it is possible to circulate the water flow in the ponds. In the present invention, the bubble diameter is determined by the pressure control valve 10, 1
By controlling 1 and 12, respectively, a desired bubble diameter can be obtained. In the present invention, the pressure sensor 13 and the control valve 10 are connected in series to the air inlet 7, and the size of the bubble is controlled based on the pressure. That is, after the air inlet is set to a predetermined size by the control valve 10, the pressure of the air in the air chamber 40 is detected by the pressure sensor 13, and the size of the bubble formed by the pressure is measured by a measuring device. By doing so, the pressure of air and the size of bubbles can be experimentally obtained.

FIG. 6 is a cross-sectional view showing another embodiment of the present invention. In FIG. 6, a microbubble generating device IV of the present invention bends a water absorption pipe at a right angle to drive a motor of a driving member 5a. The nozzle body 1 and the discharge unit 3 are characterized in that they are installed outside the pipe, and have the same configuration as the nozzle body unit 1 and the discharge unit 3 of the microbubble generator shown in FIG. The driving member 5 is provided by the fine bubble generator IV of the present invention.
The motor (a) can be installed outside the microbubble generator. In the present invention, the example in which the air suction hole is provided in the tangential direction with respect to the wall of the cylindrical main body in FIGS. 1 to 6 has been described. In this case, the angle can be any of a right angle, a water flow direction, and the reverse direction. In this case, formation of a swirling flow is not particularly intended. In the present invention, when using this microbubble generator, bubbles of 20 μm or less are preferable for shellfish, and bubbles of a size exceeding 20 μm are used for fish. Preferably, it is 30 μm to 50 μm. In addition, the method and apparatus for generating microbubbles of the present invention are preferably applied to closed water areas such as ponds and lakes in agricultural and mountainous areas, and artificially created aquaculture ponds, ponds, and other ponds in golf courses. However, it can also be used effectively in open water areas such as rivers, seas and trenches.

[0018]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

[Embodiment] The microbubble generator shown in FIG. 1 was installed in a water tank, and a bubble flow was installed around the water tank so as to move around the water tank. The test conditions were as follows: using the control valve 10 capable of adjusting the amount of air suction, changing the amount of air suction, measuring the pressure of the air in the air chamber 40 with the pressure sensor 13, and measuring the size of bubbles at each pressure. did. The measurement of the air bubbles is performed by measuring the pressure of the air in the air chamber 40 (cmH
g) The size of bubbles at 76, 66, 56, 46, 36, and 20 is photographed with a camera equipped with a microscope, the diameter of the bubbles in the visual field is measured, and the arithmetic average value is defined as the average bubble diameter. did. As the pressure sensor 13, an E8CA type pressure sensor was used. Table 1 shows the results.

[0020]

[Table 1]

[0021]

According to the method and apparatus for producing microbubbles of the present invention, microbubbles are generated by supplying depressurized air into running water, and the pressure is automatically controlled only by a control valve. Thus, a method and apparatus for producing microbubbles which can be manufactured, have a simple structure and are economical have been obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a microbubble generator of the present invention.

FIG. 2 is a cross-sectional view of the microbubble generator of FIG. 1 taken along a line AB.

FIG. 3 is a cross-sectional view showing another embodiment of the microbubble generator of the present invention.

FIG. 4 is a cross-sectional view showing still another example of a microbubble generator according to the present invention.

5 is a cross-sectional view when the nozzle body of FIG. 4 is cut along a line CD.

FIG. 6 is a sectional view showing still another embodiment of the microbubble generator of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle main body part 2, 20 Water absorption part (water absorption pipe) 3 Discharge part (discharge pipe) 4 Annular cylinder 5 Fan 6 (6a, 6b, 6c) Air intake hole 7 (71, 72, 73) Air introduction port 8 Fine bubble 9 swirling flow 10, 11, 12 pressure control valve 13, 14, 15 pressure sensor 21, 22, 23, 24 air circulation pipe 40, 41, 42 43 air chamber 2a water absorption pipe 3a having a wide water intake port 3a tapered. Discharge port 62 Air 62a Air flow AB line, CD line Cutting line

Claims (21)

[Claims] 1. A water stream absorbed by a water absorption section is sent to a discharge section. At this time, depressurized air is supplied to the water supply stream to form bubbles in the water supply stream, and the bubble stream is ejected from the discharge section. The method of generating fine bubbles, wherein the size of the bubbles is freely changed by adjusting the air pressure supplied to the water stream. 2. The method for producing fine bubbles according to claim 1, wherein the water flow is sent while swirling the water flow to a discharge portion, and air is supplied in the swirling direction of the water flow. . 3. The method for producing microbubbles according to claim 1, wherein the air is sucked from a plurality of locations in one air chamber. 4. The method for producing fine bubbles according to claim 1, wherein a plurality of air chambers for sucking air are provided. 5. The method for producing fine bubbles according to claim 1, wherein the water supply means is a fan type. 6. The method for producing fine bubbles according to claim 1, wherein the water supply means is a pump. 7. The method for producing fine bubbles according to claim 1, wherein the air adjusting means is a cock. 8. The method for producing fine bubbles according to claim 1, wherein the air adjusting means is a valve. 9. The method for producing microbubbles according to claim 1, wherein the air blowing means is perpendicular to the water flow. 10. The method for producing fine bubbles according to claim 1, wherein the air jetting means has an angle with respect to the water flow. 11. A microbubble generator comprising a water absorbing section, a nozzle body section and a discharge section, wherein the water absorbing section comprises a skirt-shaped water absorbing pipe having a wide end, and the nozzle body section comprises an annular pipe having the same diameter. A driving member is provided on the water-absorbing side of the annular pipe, and at least two air suction holes are provided in the annular pipe wall, and an outer peripheral portion of the pipe is concentrically sealed with an annular cylinder. The air chamber has a covered air chamber, and the air chamber has an air inlet. A pressure sensor and an air pressure adjusting member are connected to the air chamber in this order, and the discharge section has a tapered inner diameter in a discharge direction. The microbubble generator characterized by having expanded. 12. The microbubble generator according to claim 11, wherein the annular tube has at least two air ejection holes in a circumferential tangential direction. 13. The microbubble generation according to claim 11, wherein the water-absorbing portion is formed such that an annular pipe of the nozzle body is extended and formed at an angle with respect to the annular pipe direction. apparatus. 14. The microbubble generator according to claim 11, wherein said air chamber has a plurality of air suction ports. 15. The microbubble generator according to claim 11, wherein the air chamber has a plurality of air chambers. 16. The microbubble generator according to claim 11, wherein said water-absorbing member is of a fan type. 17. The microbubble generator according to claim 11, wherein said water absorbing member is a pump. 18. The microbubble generator according to claim 11, wherein the air adjusting member is a cock. 19. The microbubble generator according to claim 11, wherein the air adjusting member is a valve. 20. The microbubble generator according to claim 11, wherein the air inlet is perpendicular to the water flow. 21. The microbubble generator according to claim 11, wherein the air inlet has an angle with respect to the water flow.