JP2001179064A - Gas-liquid mixing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus which introduces gas deeper into a deep water part by using a self-suction-type aeration device and separates as stabilized bubbles pollutants existing in liquid. SOLUTION: A gas-liquid mixing apparatus comprises a self-suction-type aeration device introducing gas into liquid as fine air bubbles by using negative pressure generated on the back surface of a rotating impeller, an outer cylinder member surrounding the self-suction-type aeration device with one or more openings downward and upward respectively, a floating member installed around the side surface of the outer cylinder member, a separating plate separating bubbles and water flooding from the upper opening of the outer cylinder member, a bubble storing chamber storing the above separated bubbles and a liquid feeding member connected to the flow passage of the above separated water and the top end of the passage, and is characterized in that the liquid feeding member is extended to a deeper position than the impeller of the aeration device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid mixing device. More specifically, the present invention relates to an apparatus that causes air to be contained in water by generating microbubbles in water, circulates and mixes this water into a deep water portion, and separates pollutants present in the liquid as stable foam.

[0002]

2. Description of the Related Art As a device for efficiently supplying gas such as air into a liquid, the present inventors have adopted a self-priming system in which gas is introduced using negative pressure generated on the back of a rotating impeller. An aeration device was developed. That is, air is sucked through a hole in a cylindrical pipe along the impeller (Japanese Patent Application Laid-Open No. 59-160516), and a gas ejection hole is formed in the back of a hollow box-shaped impeller fixed to the vent hole of the cylindrical pipe so as to be permeable. (Japanese Patent Application Laid-Open No. 59-203693), an impeller that maintains a gap with the lower end of a cylindrical pipe is attached to a drive shaft that penetrates the cylindrical pipe, and gas is introduced from the gap.
No. 59-203694), and a gas pipe having a spiral gas outlet mounted on a cylindrical pipe along the back in the rotation direction of an impeller spirally mounted on a cylindrical pipe (Japanese Patent Application Laid-Open No. 60-114331).
All of these devices are self-priming, capable of generating a large amount of gas as extremely fine bubbles in the liquid, and have a structure that applies the negative pressure generated on the back side in the rotation direction of the impeller. With a very simple structure, it can generate a powerful vacuum pressure and suck gas into the liquid with a small amount of energy.It can increase the oxygen dissolving efficiency because it atomizes air and mixes it into the liquid. Yes,
It is easy to disassemble and assemble, and has excellent features such as extremely easy handling because it is oilless.

[0003] However, these devices cannot be used in very deep liquids. In other words, a deeper installation location of the impeller and the gas ejection hole requires a motor with high power. Therefore, the use at a water depth of 1 to 2 m is a limit from an economical point of view in consideration of energy efficiency. Therefore, in addition to the water depth of 1 to 2 m, the air-containing water could be introduced only up to the water depth to which the convection by the stirring of the impeller reaches. Accordingly, an object of the present invention is to provide a means capable of introducing air to a deeper water depth by utilizing the principle of the aeration apparatus of the present inventors.

[0004]

SUMMARY OF THE INVENTION The inventor of the present invention utilizes the negative pressure generated on the back of a rotating impeller to utilize the water flow generated by the rising force of microbubbles generated when gas is introduced. You have achieved your goal. Also, focusing on the fact that bubbles rising when a pollutant is present in the liquid form stable foams containing the pollutants, we have developed a device that can mix air into deep water while separating this stable foam, The present invention has been completed.

That is, the present invention provides: 1) a self-priming type aerator for introducing gas into the liquid as fine bubbles by using negative pressure generated on the back of a rotating impeller, and upper and lower portions surrounding the aerator. An outer cylinder member having one or more openings, a floating member provided around a side surface of the outer cylinder member, and a separator for separating bubbles and water overflowing from an upper opening of the outer cylinder member. A plate, a foam storage chamber for storing the separated air bubbles, a flow passage for the separated water, and a liquid feed member connected to a tip end of the flow passage, wherein the liquid feed member is the aeration device. A gas-liquid mixing device, which extends to a position deeper than the impeller of

[0006] 2) The gas-liquid mixing device according to the above [1], wherein the liquid sending member is a flexible tube; and 3) The gas-liquid mixing device according to the above [1], wherein a flexible tube is connected to the lower opening. It was done.

Hereinafter, the structure of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing an example of an apparatus for causing air to be contained in water by generating microbubbles in water and circulating and mixing the water in a deep water portion. In the figure, reference numeral (1) denotes a drive motor, which is connected to a self-priming type aeration device (3) for generating air bubbles into the liquid by using a negative pressure generated on the back of the rotating impeller (2). Have been. The aeration device (3) is surrounded by a cylindrical member having a double structure of an inner cylindrical member (4) and an outer cylindrical member (6).

Although the upper part of the outer tubular member (6) is sealed in this embodiment, it is sufficient if the upper part is separated from the external water area. The upper part of the inner cylinder member (4) communicates with the inner upper part of the outer cylinder, and the lower part of the inner cylinder member has an open opening (5). One or more openings (10) are provided at the lower part of the outer cylinder member, and a tubular liquid feed member (11) extends downward in communication with the openings (10). The liquid feeding member (11) is formed integrally with the opening of the outer cylinder member as in the present embodiment, and as shown in FIG. The one in which a flexible tubular material (tube) (12) such as a rubber material or a plastic material is fitted is preferably used. Also, by inserting a flexible tubular material (tube) (13) into the lower opening (5) of the inner cylindrical member, air is contained in the lower layer without affecting the environment of the water area between the upper layer and the lower layer. Can supply water.

[0009] The upward force of bubbles generated by the operation of the aeration device (3) generates an upward liquid flow (7) from the lower opening (5), and the liquid level (8) inside the cylindrical member changes to the external liquid level. It becomes higher than (9). The liquid flow caused by the head difference (H) is discharged from the leading end of the liquid sending member through the lower opening of the outer cylinder.

The length of the liquid sending member (11) can be arbitrarily set according to the purpose. Therefore, water rich in air by the aeration device can be sent from the upper portion of the inner cylinder to the outer cylinder, and further to a deeper portion of the water than the impeller through the opening at the tip of the liquid sending member. FIG. 3 is a cross-sectional view of an embodiment of the gas-liquid mixing apparatus of the present invention capable of removing contaminants in a low-flow bottom layer such as a lake by attaching them to stable foam.

The present inventors have found that the pollutants in the liquid are adsorbed by the microbubbles to form stable bubbles, and have found that the pollutants in the liquid can be removed by removing these foams, and have filed a patent application. (Japanese Patent Application No. 1-216934), the apparatus of FIG. 3 incorporates the principle of the earlier application.

In FIG. 3, (1) is a drive motor similar to that of FIG. 1, and is a self-priming system in which air is introduced into the liquid by using a negative pressure generated on the back of a rotating impeller (2). The aeration device (3) for generating air bubbles is connected.

An outer tubular member (16) having one or more openings (14) above and one or more openings (15) below is installed to surround the aeration device (3), A floating member (17) is provided around the side surface of the outer cylindrical member so that the entire apparatus can be installed on a desired water surface. Bubbles (foam) generated by the aeration device and a liquid flow caused by the rising force overflow from the opening of the outer cylindrical member (16), and a separation plate (18) is provided at the opening,
The foam passes over the separating plate (18) and accumulates in the foam storage tank (19). At this time, the foam is automatically extruded and separated by the flow of air from below. In order to separate the foam more efficiently, a foam removing device (not shown) using a scraper (not shown) or a vacuum is separately provided. ) May be attached.

On the other hand, the liquid flow passes through the flow passage (20), and extends downward from the tip (21) of the flow passage to a predetermined position deeper than the position of the impeller.
Through to the desired deep water.

According to this apparatus, oxygen can be supplied while removing pollutants in the bottom layer where there is almost no water flow, such as lakes and marshes. Therefore, lakes and marshes which could not be used for the growth of useful organisms such as fish until now are suitable for growth. Environment can be activated.

[0016]

As described above, according to the present invention, the following effects can be achieved. 1) With low energy, it is possible to measure the activation of the bottom layer of lakes and marshes by injecting abundant air (oxygen) into low oxygen-deficient low layers. 2) Oxygen and oxygen-containing water can be supplied to the lower layer without affecting the environment of the water area between the upper layer and the lower layer for sending the liquid to the lower layer. 3) By using an energy-saving aeration device as an aerator, a downward water flow can be created and sent to the bottom layer using head pressure due to bubbles generated in a shallow place. 4) The liquid in the bottom layer in the oxygen-deficient state is raised to the bubble generating portion to supply aeration and oxygen abundantly, and the bubbles in the stable foam state are forcibly or automatically separated at the interface, thereby harmful to the bottom layer contained in the liquid. It can separate and remove various gases, fungi, suspensions, etc., and supply activated oxygen-rich fresh liquid to the bottom layer, thereby activating bottom layers such as lakes and marshes.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a gas-liquid mixing device.

FIG. 2 is a longitudinal sectional view showing another example of the gas-liquid mixing device.

FIG. 3 is a sectional view of an embodiment of the gas-liquid mixing device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive motor 2 impeller 3 aerator 4 inner cylinder member 5 opening 6 outer cylinder member 7 liquid flow 8 liquid level 9 liquid level 10 opening 11 liquid sending member 12 flexible tube 13 flexible tube 14 opening 15 opening 16 outer cylinder Member 17 Floating member 18 Separation plate 19 Foam storage tank 20 Flow path 21 Flow path tip 22 Liquid feed member

Claims (3)

[Claims] 1. A self-priming type aerator for introducing gas as fine bubbles into liquid using negative pressure generated on the back of a rotating impeller, and at least one self-priming aerator surrounding the aerator and above and below the aerator. An outer cylinder member having an opening, a floating member installed around a side surface of the outer cylinder member, a separation plate for separating bubbles and water overflowing from an upper opening of the outer cylinder member, and A foam storage chamber for storing the generated air bubbles,
The separated water flow path and a liquid feed member connected to a tip end of the flow path, wherein the liquid feed member extends to a position deeper than an impeller of the aeration apparatus. Mixing equipment. 2. The gas-liquid mixing device according to claim 1, wherein the liquid sending member is a flexible tube. 3. The gas-liquid mixing device according to claim 1, wherein a flexible tube is connected to the lower opening.