JPH10277592A - Air bubble-mixing water stream-generating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase an amt. of oxygen dissolved into water in a water purifying apparatus of lakes and marshes or the like. SOLUTION: A duct 5 arranged in water is provided with screw propellers 1 and an air bubble discharge plate 13 having a large number of fine pores 13b are provided and fine air bubbles 5 generates by the fine pores 13b are carried on the revolving streams of the propellers to be diffused remotely while suppressed in rising and the contact time of air bubbles and circumferential water and the contact area of them with circumferential water are achieved to increase an amt. of oxygen dissolved into water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to water exchange and flow promotion for purifying water in closed water areas such as lakes, ponds, water tanks (live fish tanks), pools, harbors, and aquaculture farms. The present invention relates to a bubble-mixed water flow generator.

[0002]

2. Description of the Related Art As a water purification device in a closed water area, a water flow is generated by a water flow generation device 01 shown in FIG. 7, and bubbles generated by a bubble generation device 02 shown in FIG. Is known.

[0003] In the water flow generator 01, a screw propeller 1 rotatably driven by a motor 3 is arranged in a cylindrical duct 5 having openings at both ends as shown in FIG. It is configured to generate a water flow 9 by being driven by an external power supply 8. 7, reference numeral 2 denotes propeller boss, reference numeral 4 denotes a supporting device, reference numeral 6 denotes a water surface, and reference numeral 7 denotes a water bottom. As shown in FIG. 8, the bubble generator 02 is configured to generate air bubbles 12 by sending air from a compressor 10 or the like to an air bubble generator 11 installed on the water bottom 7.

[0004]

However, in the above-described conventional water purification apparatus, there is a problem that the bubbles generated by the bubble generator 02 are large, so that the bubbles quickly float due to buoyancy and do not reach far. In addition, since the bubble diameter is large, the contact area with surrounding water is small, and there is a problem that the effect of improving water quality is small.

[0005] The present invention is intended to solve these problems, and by generating a large amount of fine bubbles with a simple structure, the area of contact with ambient water is increased, and the amount of oxygen dissolved in the ambient water is reduced. It is an object of the present invention to provide a device which can increase the size and efficiently diffuse air bubbles over a water flow.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a water flow generating apparatus including a duct disposed in water and having openings at both ends, and a screw propeller provided inside the duct. In addition, a microbubble generating portion communicating with an air source is provided as a means for solving the problem. Also,
The above-mentioned microbubble generating section is constituted by a spiral bubble discharge tube having a large number of micropores for generating microbubbles, which is a means for solving the problem.

In the present invention, a large amount of fine air bubbles are generated in the fine air bubble generating section, and the fine air bubbles are sheared by the water flow generated by the rotation of the screw propeller to be further miniaturized and mixed into the water flow. Since the bubbles are fine, the buoyancy is small, and the bubbles are diffused to a distant place in the water flow, so that the amount of oxygen dissolved in the surrounding water can be greatly increased. In addition, the spiral bubble discharge tube acts to increase the swirling of the water flow, and can promote the diffusion of bubbles to a distant place.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a first embodiment of the present invention; FIG. FIG. 2 is a sectional view taken along the line AA of FIG.
4 and 5 are side sectional views of main parts of the modified example.
FIG. 6 is a side sectional view of an air bubble mixing type water flow generator as the second embodiment. 1 to 6, the same reference numerals as those in FIGS. 7 and 8 indicate substantially the same members.

The first embodiment will be described with reference to FIGS. In the case of the first embodiment, the duct 5 is formed as a cylindrical body having openings at both ends, and is installed horizontally on the water bottom, similarly to the duct 5 of the conventional apparatus shown in FIG.

[0010] Inside the duct 5, a screw propeller 1 driven by the motor 3 is provided concentrically with the duct 5, and fine bubbles are generated around the entire inner wall surface of the duct 5 downstream of the screw propeller 1. A bubble release plate 13 is attached as a part. Reference numeral 3a indicates a rotation axis.

The bubble discharge plate 13 is formed by forming a porous material having a large number of fine pores 13b for generating a number of fine bubbles in an annular shape, and is embedded flush with the inner wall surface of the duct 5. The air supplied from the compressor 10 through the ventilation pipe 10a can be ejected from the fine pores 13b as fine bubbles. Reference numeral 13a denotes an annular ventilation flow path provided outside the annular bubble release plate 13. A ventilation pipe 10a is connected to the annular ventilation flow path 13a, and air flows from the compressor (air source) 10 to the annular ventilation flow path 13a. Vent pipe 10a → Annular vent passage 13a → Bubble discharge plate 13
The fine pores 13b flow in this order to generate fine bubbles in the duct 5. Arrow 16 in the figure indicates the direction of the water flow in the duct generated by the screw propeller 1. Reference numeral 15 denotes a fine bubble (for example, having a diameter of 300 μm) generated in the fine pores 13b.

In the above configuration, when the screw propeller 1 rotates, a water flow is generated in the duct 5. By generating a relative flow velocity on the surface of the bubble discharge plate 13, fine bubbles 15 are generated. When the flow rate is low, the bubbles immediately after being generated from the bubble release plate 13 are successively united with other bubbles and become large, and the buoyancy is also increased and immediately rises.
However, when the flow velocity of the water flow is high, it is further miniaturized by the shear force of the water flow, and is also flown before it is combined with other air bubbles. It spreads to the point.

In the case of this embodiment, since the water flow has the rotational force of the screw propeller 1 and the flow velocity in the horizontal direction by the duct 5, the floating of the bubbles is suppressed, and the diffusion to the distant place is promoted.

As described above, since the bubbles stay in the water for a long time in a very small shape, the contact time of the bubbles in contact with the surrounding water increases, and the contact area also increases (for the same amount of air, the bubbles are increased). The smaller the diameter, the larger the contact area between the bubbles and the surrounding water). As a result, the amount of oxygen dissolved in water increases, and the effect of improving water quality can be greatly increased.

In particular, since the water flow generator is of a propeller type, the flow velocity is higher near the outer periphery of the propeller and a swirling flow is also generated. The absolute flow velocity of the water flow on the surface of the surface becomes high, and the generation of fine bubbles becomes easy, and a large amount of fine bubbles can be generated with a simple configuration.

In the modification shown in FIG. 3, the bubble discharge plate 13 is provided at the same position as the screw propeller 1. FIG. 4
In the modified example, the bubble discharge plate 13 is provided on the upstream side of the screw propeller 1. Further, in the modification of FIG. 5, the duct 5 is formed in a tapered nozzle shape, and the bubble discharge plate 13 is provided at a place where the cross section of the flow path is narrowed.

When the cross-sectional area of the duct 5 is the same before and after the screw propeller 1, even if the position of the bubble discharge plate 13 changes as in the modified examples shown in FIGS. Approximately the same functions and effects as those shown are obtained.

Also, as shown in a modification shown in FIG.
By narrowing the flow path cross section downstream of the screw propeller 1, the flow velocity can be accelerated near the installation position of the bubble discharge plate 13, and the generation of fine bubbles can be further promoted.

Next, a second embodiment will be described with reference to FIG. In the bubble-mixed water flow generating device according to the second embodiment, a bubble discharge tube 17 having a large number of fine pores for generating fine bubbles is formed in a spiral shape inside a frustum-shaped duct 5 having openings at both ends. It is provided in.

The bubble discharge tube 17 is a screw propeller 1
(This screw propeller 1 is also arranged concentrically in the duct 5). The screw propeller 1 is formed in a spiral shape in the same twisting direction as the twisting direction of the water flow generated.

In the second embodiment, since the area where the water flow comes into contact with the bubble discharge portion (bubble discharge tube 17) increases, more air (oxygen) can be sent into the water flow. Furthermore, since the bubble discharge pipe 17 acts to increase the swirling of the water flow, the swirling force of the water flow is strengthened, and it is possible to promote distant diffusion while suppressing the floating of bubbles.

[0022]

As described above in detail, the following effects and advantages can be obtained by the air bubble mixing type water flow generator of the present invention. (1) A large amount of microbubbles are generated with a simple configuration, and the microbubbles are further micronized by the shear force of the water stream. Can spread. (2) According to the above (1), the contact time and the contact area between the bubbles and the water stream can be increased, whereby the amount of oxygen dissolved in water can be increased. (3) The spiral bubble discharge tube acts to increase the swirling of the water flow, and can promote the diffusion of bubbles to a distant place. (4) According to (2) and (3) above, the water quality can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an air bubble mixing type water generating device as a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a side sectional view of a main part of the modification.

FIG. 4 is a side sectional view of a main part of the modification.

FIG. 5 is a side sectional view of a main part of the modification.

FIG. 6 is a side sectional view of an air bubble mixing type water generating device as the second embodiment.

FIG. 7 is a side sectional view of a conventional water flow generation device.

FIG. 8 is a side sectional view of the bubble generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw propeller 2 Propeller boss 3 Motor 4 Stand 5 Duct 6 Water surface 7 Water bottom 8 External power supply 10 Compressor (air source) 10a Vent pipe 13 Bubble discharge plate as fine bubble generation part 13a Annular ventilation channel 13b Micropore 15 Fine Bubbles 16 Water flow direction 17 Bubble discharge tube as microbubble generator

Claims (2)

[Claims] 1. A duct provided in water and having openings at both ends, and a screw propeller provided inside the duct, and a fine bubble generating portion communicating with an air source is provided on an inner surface of the duct. A bubble-mixed water flow generator, characterized in that: 2. The air bubble mixing according to claim 1, wherein the fine air bubble generating section is formed by a spiral air bubble discharge tube having a large number of fine pores for generating fine air bubbles. Type water flow generator.