JP3418608B2 - Gas-liquid mixing device - Google Patents

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 a device in which air is contained in water by generating minute bubbles in water, the water is circulated and mixed in the deep water portion, and contaminants existing in the liquid are separated as stable foams.

[0002]

2. Description of the Related Art As a device for efficiently supplying a gas such as air into a liquid, the inventors of the present invention have adopted a self-priming system in which a negative pressure generated on the back surface of a rotating impeller is used to introduce the gas. Developed an aerator. That is, air is sucked from the hole of the cylindrical pipe along the impeller (Japanese Patent Laid-Open No. 59-160516), and a gas ejection hole is formed on the back surface of the hollow box-shaped impeller fixed to the ventilation hole of the cylindrical pipe so as to allow ventilation. An installed impeller (Japanese Unexamined Patent Publication No. 59-203693), an impeller for keeping a gap with the lower end of the cylindrical pipe is attached to a drive shaft penetrating the cylindrical pipe, and gas is introduced from the gap (Japanese Unexamined Patent Publication No. Sho.
59-203694), and a gas pipe that is spirally attached to a cylindrical pipe along the back surface in the direction of rotation of an impeller spirally attached to the cylindrical pipe (JP-A-60-114331).
All of these devices are self-priming and can generate a large amount of gas in the liquid as ultrafine bubbles, and because of the structure that applies the negative pressure generated on the back surface of the impeller in the rotation direction, A strong vacuum pressure can be generated to suck a gas into the liquid with a small amount of energy, and since air is atomized into the liquid to mix it in the liquid, the efficiency of dissolving oxygen can be increased. Yes,
It has the excellent features that it can be easily disassembled and assembled, and because it is an oil-free type, it is extremely easy to handle.

However, these devices cannot be used in deep liquids. That is, when the installation locations of the impeller and the gas ejection holes become deeper, a large-powered motor is required. Therefore, from the economical point of view in consideration of energy efficiency, use at a water depth of 1 to 2 m is the limit. Therefore, in addition to the water depth of 1 to 2 m, the air-containing water can be introduced only to a water depth at which convection due to stirring of the impeller reaches at most. Therefore, it is an object of the present invention to provide means capable of introducing air to a deeper water depth by utilizing the principle of the aeration apparatus of the present inventors.

[0004]

Means for Solving the Problems The inventor of the present invention uses the water flow generated by the ascending force of the minute bubbles generated when the gas is introduced by utilizing the negative pressure generated on the back surface of the rotating impeller. Achieved the purpose. Also, paying attention to the fact that bubbles rising when pollutants are present in the liquid form a stable foam containing pollutants, and developed a device that can mix air into deep water while separating this stable foam, The present invention has been completed.

That is, according to the present invention, 1) a cylindrical member (inner cylinder) having an upper end located above the liquid surface has an impeller, and the negative pressure generated on the back surface of the rotating impeller is used to make the cylindrical member. Surround the self-priming aerator and the aerator that sucks gas from the upper end of the cylinder and introduces it into the liquid as fine bubbles from the lower part of the tubular member, and causes an upward flow around the tubular member due to the buoyancy of the bubbles. An outer cylinder member having one or more openings above and below, a floating member installed around the side surface of the outer cylinder member, and bubbles and water overflowing from the upper opening of the outer cylinder member. A separation plate for separating, a foam storage chamber for storing the separated bubbles, a flow passage of the separated water and a liquid feeding member connected to a tip portion of the flow passage, the liquid feeding member is Extends deeper than the impeller of the aerator Gas-liquid mixing apparatus according to claim bets,

2) The gas-liquid mixing device as described in 1 above, wherein the liquid feeding member is a flexible tube, and 3) the gas-liquid mixing device as described in 1 above, in which a flexible tube is connected to the lower opening. It was done.

The structure of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a vertical cross-sectional view showing an example of an apparatus for causing air to be contained in water by generating fine bubbles in water and circulatingly mixing the water in the deep water portion. In the figure, (1) is a drive motor, which is connected to an aeration device (3) for bubble generation of a self-priming system that introduces air into a liquid by using a negative pressure generated on the back surface of a rotating impeller (2). Has been done. The aeration device (3) is surrounded by a tubular member having a double structure of an inner tubular member (4) and an outer tubular member (6).

Although the upper portion of the outer tubular member (6) is sealed in this example, it is sufficient if it is isolated from the external water area. The upper part of the inner cylinder member (4) communicates with the upper part of the outer cylinder, and the lower part of the inner cylinder member has an open opening (5). There is one or a plurality of openings (10) in 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 constructed integrally with the opening of the outer tubular member as in this example, and is also provided in the opening (10) of the outer tubular member as shown in FIG. A material 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 tubular member, air can be contained in the lower layer without affecting the environment of the water area between the upper layer and the lower layer. Water can be supplied.

An upward liquid flow (7) is generated from the lower opening (5) by the ascending force of bubbles generated by the operation of the aeration device (3), and the liquid level (8) inside the tubular member is the external liquid level. It is higher than (9). The liquid flow due to the head difference (H) is discharged from the tip of the liquid sending member through the lower opening of the outer cylinder.

The length of the liquid feeding member (11) can be any length depending on the purpose. Therefore, water containing abundant air by the aeration device can be sent from the upper part of the inner cylinder to the outer cylinder, and further through the tip opening of the liquid feeding member to a water depth much deeper than the impeller. FIG. 3 is a cross-sectional view of an embodiment of the gas-liquid mixing device of the present invention capable of adhering and removing pollutants in a bottom layer such as a lake or the like with little flow by adhering to stable foam.

The inventors of the present invention have found that contaminants in the liquid are adsorbed by the fine bubbles to form stable bubbles, and that the contaminants in the liquid can be removed by removing the bubbles, and a patent application has been made. (Japanese Patent Application No. 1-216934), the apparatus of FIG. 3 incorporates the principle of the above-mentioned application.

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

An outer cylinder member (16) having one or more openings (14) in the upper part and one or more openings (15) in the lower part is installed so as to surround the aeration device (3), A floating member (17) is installed around the side surface of the outer cylinder member so that the entire apparatus can be installed on a desired surface of the water body. Bubbles (foam) generated in the aeration device and the liquid flow due to the ascending force overflow from the opening of the outer cylinder member (16), and a separation plate (18) is installed in the opening.
The foam passes over the separation plate (18) and is stored in the foam storage tank (19). At this time, the foam is automatically pushed out and separated by the air flow from below, but a foam remover (not shown) using a separate scraper (not shown) or vacuum is used to separate the foam more efficiently. ) May be attached.

On the other hand, the liquid flow passes through the flow passage (20) and extends downward from the tip end (21) of the flow passage to a predetermined position deeper than the position of the impeller (22).
To the desired deep water part.

According to this apparatus, oxygen can be supplied while removing pollutants in the bottom layer where there is almost no water flow in lakes and marshes, which is suitable for growing lakes and marshes which could not be used to grow useful organisms such as fish. It can be activated into the environment.

[0016]

As described above, according to the present invention, the following effects can be achieved. 1) With a small amount of energy, water containing abundant air (oxygen) can be injected into the oxygen-deficient lower layer to activate the bottom layer of lakes and marshes. 2) Oxygen and oxygen-containing water can be supplied to the lower layer without affecting the environment of the body of water between the upper layer and the lower layer to send the liquid to the lower layer. 3) An energy-saving type aerator can be used as an aerator, and a downward water flow can be created and sent to the bottom layer by using the head pressure generated by bubbles generated at a shallow water depth. 4) Raise the oxygen-deficient bottom layer liquid to the bubble generation area to supply aeration and oxygen abundantly, and forcibly or automatically separate the stable foam state bubbles at the interface, damaging the bottom layer contained in the liquid. It is possible to separate and remove various gases, fungi, suspensions, etc., and to supply the activated oxygen-rich fresh liquid to the bottom layer, thereby activating the bottom layer such as lakes and marshes.

[Brief description of drawings]

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

FIG. 2 is a vertical 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]

1 drive motor 2 impeller 3 Aeration device 4 Inner tube member 5 openings 6 Outer cylinder member 7 Liquid flow 8 liquid level 9 liquid level 10 openings 11 Liquid sending member 12 Flexible tube 13 Flexible tube 14 openings 15 openings 16 Outer cylinder member 17 Floating member 18 Separation board 19 Foam storage tank 20 flow paths 21 Flow path tip 22 Liquid sending member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-102196 (JP, A) JP-A-59-29095 (JP, A) Actual development: JP-A-57-76796 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B01F 3/04

Claims (3)

(57) [Claims] 1. An impeller is provided below a cylindrical member (inner cylinder) whose upper end is located above the liquid surface, and gas is discharged from the upper end of the cylindrical member by utilizing the negative pressure generated on the back surface of the rotating impeller. A self-priming aerator that sucks and introduces fine air bubbles into the liquid from the bottom of the tubular member, and causes an upward flow around the tubular member due to the buoyancy of the bubbles, and surrounds the aerator and the aerator, respectively. An outer cylinder member having one or more openings, a floating member installed around the side surface of the outer cylinder member, and a separation plate for separating bubbles and water overflowing from the upper opening of the outer cylinder member. A liquid storage chamber for storing the separated bubbles, a flow passage for the separated water, and a liquid feeding member connected to a tip portion of the flow passage, the liquid feeding member being an impeller of the aeration device. Gas-liquid mixture characterized by extending to a deeper position Combination device. 2. The gas-liquid mixing device according to claim 1, wherein the liquid feeding 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.