JP2000210545A - Bubble generator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an air bubble generating device which is installed in a liquid tank to generate air bubbles. A swirling chamber provided with a fluid inflow section is provided.
An air inlet 5 is provided at the center of the upper part of the swirl chamber 3, and a tapered outlet 7 is connected to an outlet 6 facing the air inlet 5, and a plurality of outlets 8 are connected to the tapered outlet 7. It is characterized by having been provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bubble generator.

[0002]

2. Description of the Related Art Conventionally, when discharging industrial wastewater, for example, an emulsified liquid (liquid to be treated) mixed with a surfactant or the like,
Since the oil component is not separated as it is, a flocculant is injected into the floc to form a flocculant. Then, the flocculant is introduced into a floating tank of a pressure flotation apparatus as shown in FIG. Then, fine air bubbles generated by depressurizing the pressurized air water are injected into the floating tank, combined with the agglomerated flocs to form a scum, and separated into a processing liquid and the scum so as to be discharged. I have.

In order to generate bubbles to be injected into the floating tank, as shown in FIG. 4, an air dissolving tank for dissolving air under pressure, a pipe for supplying compressed air, and an energy cost are required. is necessary. Therefore, the equipment cost and energy cost for generating the bubbles are high.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a bubble generating apparatus capable of generating bubbles in the floating tank.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is provided with a swirl chamber having a fluid inflow portion, An air inlet is provided in the upper central portion of the upper portion, and a tapered outlet is connected to an outlet facing the air inlet,
A plurality of discharge ports are provided at the tapered outlet.

The invention according to claim 2 is characterized in that the fluid inflow portion is formed so that fluid flows into the swirl chamber from a tangential direction.

Further, according to a third aspect of the present invention, each of the discharge ports is provided at a lower portion of the tapered outlet portion.
The discharge ports are formed so as to discharge the gas-liquid mixture from a tangential direction or a radial direction of the tapered outlet.

[0008]

Next, an embodiment of the present invention will be described. The present invention is, for example, a bubble generating device that is installed in a liquid tank to generate bubbles, and has a configuration in which a circular swirl chamber is provided at a predetermined position of a cylindrical main body, and a fluid (liquid) is supplied to the swirl chamber. Is provided so as to flow from the tangential direction. An air inlet is provided in the upper center of the swirl chamber, and a tapered outlet is connected to an outlet facing the air inlet, and a gas-liquid mixture flowing out of the swirl chamber is provided below the tapered outlet. Are provided in the tangential direction. Further, a bottom plate member for sealing a lower surface of the main body, that is, a lower end portion of the tapered outlet portion is provided. Further, each of the discharge ports may be provided so as to be in a radial direction of the tapered outlet.

Next, a description will be given of a case where the bubble generating device having the above-mentioned configuration is installed in a floating tank of a pressurized flotation device for treating and discharging industrial wastewater (for example, an emulsion).
A water supply line equipped with a pump is connected to the fluid inflow portion of the bubble generator, and an air supply line is connected to the air inlet. Then, after injecting a flocculant into industrial wastewater (for example, an emulsion), it flows into the floating tank,
The pump is driven to supply water.

The liquid that has flowed into the swirl chamber as a jet from the fluid inflow section rotates along the inner peripheral wall of the swirl chamber to form a negative pressure section at the center. Air is sucked into the negative pressure portion from the air introduction port, and a vortex (a reverse tornado-shaped spiral vortex, that is, a reverse tornado-shaped or rope-shaped gas-liquid separation shape in a cylindrical body) is formed at the center. The vortex is formed of a gas-liquid mixture composed of liquid and air, and is decelerated in the tapered outlet to increase the pressure, meandering under the influence of the pressure increase, and flowing down while fluttering. Then, the fluid sequentially flows into the plurality of discharge ports without losing momentum. The air in the gas-liquid mixture flowing into each of the discharge ports generates fine bubbles in proportion to the moving speed of the vortex, and flows out into the floating tank. The bubbles and the flocculated floc formed by the injection of the flocculant are united to form a scum, and the scum overflows to separate and discharge the scum and the treatment liquid.

As described above, according to the present invention, air bubbles can be generated at low cost without the need for a conventional air dissolving tank or a supply pipe for compressed air. It is also preferable to install the bubble generator for supplying oxygen to a living cage or the like.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a top view of the bubble generator of the present invention, FIG. 2 is a cross-sectional explanatory view taken along the line II-II of FIG. 1, and FIG. 3 is a pressurized device provided with the bubble generator of the present invention. It is an explanatory view showing roughly composition of a flotation separation device.

In FIG. 1 and FIG.
Is provided, for example, in a liquid tank to generate air bubbles. A circular swirl chamber 3 is provided at a predetermined position of a columnar main body 2, and a fluid (liquid) is tangential to the inner peripheral wall of the swirl chamber 3. A fluid inflow portion 4 formed so as to flow in from a direction is provided. An air inlet 5 is provided at the center of the upper part of the swirl chamber 3, and an outlet 6 is provided at a lower part of the swirl chamber 3 opposed to the air inlet 5, and the outlet 6 has a tapered outlet 7.
Are connected. The spread angle of the tapered outlet 7 is appropriately set in a range of 3 ° to 15 °. At the lower part of the main body 2, that is, at the lower part of the tapered outlet part 7, a plurality of gas-liquid mixtures in which the liquid flowing from the fluid inflow part 4 and the air flowing from the air inlet 5 are mixed are discharged (this embodiment). In the example, eight discharge ports 8 are provided. Each of the discharge ports 8 is opened so as to be in a tangential direction of the tapered outlet 7. Then, a bottom plate member 9 is provided on the lower surface of the main body 2,
The tapered outlet 7 is sealed.
It is also preferable that each of the discharge ports 8 is opened so as to be in the radial direction of the tapered outlet section 7 according to the embodiment.

Next, a description will be given of a configuration in which the bubble generator 1 having the above-described configuration is installed in a flotation tank 11 of a pressure flotation / separation device 10 for treating and discharging industrial wastewater (for example, an emulsion) (FIG. 3). reference).

In FIG. 3, the pressure flotation device 10
Is a supply line 12 for a liquid to be treated (e.g., an emulsion).
The coagulant is injected into the floating tank 11 by a chemical injection device 13 to form oil in the liquid to be treated into coagulated flocs. Then, the fine bubbles generated by the bubble generator 1 and the flocculated flocs are united to form a scum, which is separated into treated water and the scum and discharged.

As shown in FIG. 3, a water supply line 15 equipped with a pump 14 is connected to the fluid inflow section 4 of the bubble generator 1. On the other hand, an air line 17 having a valve 16 is connected to the air inlet 5. Then, the liquid to be treated (agglomerated floc) is introduced into the floating tank 11, and the pump 14 is driven to generate bubbles.

Here, the operation of the bubble generator 1 will be briefly described. The liquid (in this embodiment, treated water) that has flowed into the swirling chamber 3 as a jet from the fluid inflow section 4 is:
By rotating along the inner peripheral wall of the swirling chamber 3, a negative pressure portion is formed at the center. The air line 17 is connected to this negative pressure section.
, A vortex (a reverse tornado-shaped spiral vortex) is formed in the center. This vortex is formed by a gas-liquid mixture consisting of a liquid and air. Then, the vortex is decelerated in the process of flowing down the inside of the tapered outlet portion 7 from the outlet 6 and the pressure is increased. Under the influence of this pressure increase, the vortex
Meandering and wandering further down. Then, the fluid sequentially flows into each of the discharge ports 8 without losing momentum. The air in the gas-liquid mixture flowing into each of the discharge ports 8 generates fine bubbles in proportion to the moving speed of the vortex, and generates air bubbles.
Outflow into 1.

[0018]

As described above, according to the present invention, the rotation of the liquid flowing into the swirling chamber forms a negative pressure portion at the center portion, and air flows into the negative pressure portion from the air inlet so that the center portion becomes negative. A vortex is formed in the part. The vortex is decelerated in the tapered outlet to increase the pressure, meandering under the influence of the pressure increase, flowing down while wobbling, and generating fine bubbles from each discharge port. Further, the bubble generating device of the present invention has a simple structure and low cost.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a bubble generator according to the present invention as viewed from above.

FIG. 2 is an explanatory sectional view taken along line II-II of FIG.

FIG. 3 is an explanatory view schematically showing a configuration of a pressure flotation device provided with the bubble generation device of the present invention.

FIG. 4 is an explanatory view schematically showing a configuration of a pressure flotation / separation device provided with a conventional bubble generation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bubble generator 3 Swirling chamber 4 Fluid inflow part 5 Air inlet 6 Outlet 7 Tapered outlet 8 Discharge port

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Seiji Tai 7, Horie-cho, Matsuyama-shi, Ehime Prefecture Miura Kogyo Co., Ltd. F-term (reference) 4D037 AA12 AB02 BA03 BA07 BB04 BB07 CA08 4G035 AB16 AE13

Claims (3)

[Claims] A swiveling chamber provided with a fluid inflow portion;
An air inlet 5 is provided at the center of the upper part of the swirl chamber 3, and a tapered outlet 7 is connected to an outlet 6 facing the air inlet 5, and a plurality of outlets 8 are connected to the tapered outlet 7. An air bubble generator characterized by being provided. 2. The bubble generator according to claim 1, wherein the fluid inflow portion is formed so that fluid flows into the swirling chamber in a tangential direction. 3. Each of the discharge ports 8 is provided at a lower portion of the tapered outlet section 7, and each of the discharge ports 8 discharges the gas-liquid mixture from a tangential direction or a radial direction of the tapered outlet section 7. The air bubble generator according to claim 1 or 2, wherein the air bubble generator is formed in each of the air bubbles.