JPS63224724A - Agitating and mixing device for liquid and gas - Google Patents

Abstract

PURPOSE:To disperse fine bubbles to farther distance, by constituting the device with a straight cylindrical sheath body and a driving body which is longer than the sheath body and has smooth outer peripheral surface and is coaxially inserted all over the length into the sheath body. CONSTITUTION:A dispersing piece 6 is projectingly provided to the lower peripheral surface of the driving body 1 so as to confront the lower opening part of a clearance 5, and the liquid surrounding the dispersing piece 6 is rotated with the high speed revolving motion of the driving body 1 and is vigorously flowed to radial direction by the revolving force. Therefore, the fine bubbles are discharged downward from a clearance 5 to collide with the dispersing piece 6, and are repelled out to the radial direction with the surrounding liquid. Thus, the fine bubbles discharged downward from the clearance 5 are corrected to change the discharged direction to the radial direction by the dispersing piece 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for stirring and mixing liquid and gas, which allows gas to be more efficiently dissolved into liquid.

[Conventional technology]

A device for dissolving gas such as air into a liquid such as water uses a compressor or blower to forcefully send the gas into a pipe placed in the liquid, and a large number of small holes provided in this pipe are used. There are methods in which gas is ejected into the liquid as bubbles, and methods in which a water wheel is rotated by a drive device such as a motor at the surface of the liquid to generate violent spray, and this spray scrapes many bubbles into the liquid. However, the bubbles in the liquid obtained by these devices are so large that they rise to the liquid surface in a short time due to the buoyancy of the bubbles themselves, making it difficult for the gas to dissolve into the liquid. I couldn't get enough time.

The above-mentioned stirring and mixing device for liquid and gas is used in many fields such as aquaculture and water purification, but the emergence of a stirring and mixing device that can dissolve a larger amount of gas into the liquid has been strong. desired.

In particular, when there is little water going in and out of the aquaculture pond, such as in the case of eel farming, the above-mentioned stirring and mixing device does not dissolve much air into the water, so the stirring and mixing device must be driven continuously. However, in a short period of time, not only does the concentration of ammonia in the water increase, but also the appearance of blue-green algae, which is often extremely inconvenient for aquaculture.

In order to eliminate this inconvenience, the present inventor has developed an invention (Japanese Patent Publication No. 61-36
448) was first proposed.

[Problem that the invention seeks to solve]

The technology shown in this Japanese Patent Publication No. 61-36448 is
A straight cylindrical outer shell is arranged with the upper end opening opening into the gas atmosphere to be stirred and mixed protruding above the surface of the liquid to be stirred and mixed, and the outer shell is coaxially arranged along the entire length of the outer shell. It consists of a straight cylindrical drive body that is inserted and assembled and driven to rotate at high speed, and the gap between the outer shell and the drive body is such that liquid can enter the gap when the drive body rotates at high speed. The configuration is set to the lowest possible value within the possible range.

This Japanese Patent Publication No. 6,136,448 states that even if a gas has a much lower specific gravity than a liquid, when it forms extremely small bubbles and is located in the liquid, a phenomenon similar to Brownian motion acts on the bubbles. Focusing on the fact that it is possible to overcome the buoyant force of the liquid and stay in the liquid for a long period of time while floating irregularly, by violently swirling the liquid in the gas atmosphere, extremely small amounts of gas in the liquid can be created. By generating air bubbles and allowing these extremely small and large numbers of air bubbles to remain in the liquid for a long period of time, the dissolution of the gas into the liquid is achieved extremely efficiently.
The liquid enters the gap from the opening at the lower end of the outer shell, and the liquid in the gap is stirred and mixed with gas by the intense vortex movement generated by the high-speed rotational movement of the driving body, and generated by this stirring and mixing. A liquid containing many fine bubbles is discharged downward from the opening at the lower end of the outer shell.

However, with the above configuration, the liquid mixed with gas that is ejected from the lower end of the outer shell is ejected downward from the lower end opening of the outer shell along the vortex flow, and the ejection direction is restricted. This makes it difficult to disperse over a wide area underwater in a short period of time.

In view of this, in the above invention, the driving body is made into a cylindrical shape, and a large number of air release holes are formed in the lower end of the peripheral wall protruding from the lower end of the outer shell, so that the driving body A configuration is also proposed in which large-diameter bubbles are ejected in the radial direction into the water directly below the opening at the lower end of the outer shell.

That is, by utilizing the high-speed rotational movement of the driving body, air is ejected in a radial direction from the air release hole opened at the lower end of the driving body,
The idea is to make the narrow air bubbles released downward by this air jet into a radial direction, but in actual operation, it is not possible to obtain a sufficient effect, and instead the air bubbles are released into the water through the air vents. The disadvantage was that the large air bubbles from the air quickly lose their aim in the radial direction, and the smaller air bubbles around them aggregate and float to the surface.

For example, an outer shell with an inner diameter of 61 mm and a height below the water surface of 930 Mn, and a 35 mm diameter shell with a height of 1070 mm below the water surface.
A device constructed by assembling a drive body adjusted to 8000
When rotating at ~11,000 rpm, the bubbles formed in the gap are only released from the gap according to the vortex, so they are released downward from the lower end opening of the outer shell, and The scattering range was also within approximately 5 m of the device.

The present invention was devised in order to eliminate the drawbacks and inconveniences of the conventional examples described above, and the present invention is designed to eliminate the drawbacks and inconveniences of the conventional examples. The technical problem is to efficiently achieve the radial scattering of the stirred mixture discharged downward from the gap by simply guiding the direction of the scattering of the stirred mixture.

[Means for solving problems]

6. The present invention will be described below with reference to the drawings showing one embodiment of the present invention.

The stirring and mixing device for liquid and gas according to the present invention is composed of a straight cylindrical outer shell 2 and a straight cylindrical driving body 1.

The outer shell 2 is arranged such that the upper end opening 3, which is open into the gas atmosphere to be mixed, protrudes above the level of the liquid to be mixed.

Further, the driving body 1 has a longer length than the outer shell 2 described above and has an extremely smooth outer circumferential surface, and has a coaxial center within the outer shell 2 over the entire length of the outer shell 2. It is inserted and assembled into a soo.

(rpm) or higher.

A dissipating piece 6 is provided in a protruding manner on the lower circumferential surface of the driving body 1 and protrudes from the lower end of the outer shell 2.
Furthermore, the gap 5 formed between the outer shell 2 and the driving body 1 described above is set to the smallest possible value within the range that allows the liquid to enter the gap 5 during high-speed rotation of the driving body 1. is set to

The reason why the outer peripheral surface of the drive body 1 is polished to an extremely smooth surface is that the drive body 1 can be rotated from 8000 (rpm) to 11000 (rpm).
This is to reduce friction with the liquid as much as possible since it is rotated at an extremely high speed of about [rprrl].

If the outer circumferential surface of the driving body 1 is not smooth, severe vibrations will occur in the driving body 1 rotating at high speed, making it impossible to obtain the desired rotational speed.

[Effect]

In the above structure, liquid enters the gap 5 formed between the outer shell 2 and the driving body 1 from the lower end of the outer shell 2, and the outer shell 2 Since the upper end opening 3 is always open, gas is supplied from the upper end opening 3.

When the driver 1 is rotated at a high speed of 8000 rpm or higher from this state, the gap 5 that contacts the outer peripheral surface of the driver 1 is
The liquid and gas inside rotate following the rotational movement of the driving body 1, causing a violent vortex movement, and thus being drawn downward. The gas drawn into the liquid by the eddying motion is vigorously stirred with the liquid by the high-speed rotational motion of the driver 1 and the violent eddying motion of the liquid, and is fragmented and formed into extremely thin bubbles.

In this way, the formed extremely thin bubbles are vigorously discharged downward from the lower end opening 4 of the outer shell body 2 together with the liquid that is violently swirling.

Further, since a dissipating piece 6 is protruded from the lower circumferential surface of the driving body 1 in a position facing the lower end opening of the gap 5, the high-speed rotational movement of the driving body 1 causes the surroundings of the dissipating piece 6 to be The liquid is also forcibly rotated, and this rotational force causes it to flow vigorously in the radial direction.

For this reason, the thin air bubbles that are ejected downward from the gap 5 hit the dissipation piece 6 and are blown away in the radial direction together with the liquid around the dissipation piece 6. The ejection direction of the thin air bubbles emitted downward from inside 5 is corrected in the radial direction by the dispersion piece 6, thereby achieving the scattering of the thin air bubbles further away.

Therefore, as mentioned above, a large number of extremely fine microscopic bubbles can be generated over a wide range in a liquid by the vortex motion, so that the gas reliably dissolves and mixes in the liquid and maintains this state for a long time. It is possible to maintain this for a long time.

〔Example〕

In the following description, a case will be described in which water is used as a liquid and air is used as a gas.

In the case of the illustrated embodiment, the outer shell 2 is fixed at its upper end to a base plate 7 which is immovably disposed directly above the water surface, with its upper end opening 3 not being closed.

A plate 8 is fixed on the base plate 7 with a fixed interval between it and the base plate 7, and a motor 9 serving as a driving source is fixed to the plate 8.

In order to install the motor 9, a bearing body 12 is fixed to the plate 8, which firmly holds the upper part of the drive body 1, which is coaxially inserted and assembled into the outer shell body 2 and extends upward. The drive body 1 is held so that it can rotate at high speed in a stable state without vibration.

Further, the dissipating piece 8 on the circumferential surface of the upper end of the driving body 1 may have a flange shape or a plurality of protruding pieces. Any material that can reliably form a water flow in the radial direction in the water immediately below the portion 4 may be used.

A pulley 10 is fixed to a portion of the driver 1 located in the gap between the base plate 7 and the mounting plate 8, and is fixed to the motor shaft of the motor 9, and the drive body 1 is located in the gap between the base plate 7 and the mounting plate 8. A transmission belt is passed between the drive boot 1 located between the drive body 1 and the drive body 1, and the drive body 1 is rotated by a motor 9.

In addition, 13 in the figure is a mounting bracket, and the bearing body 1 described above is
The attachment 2 is provided to further increase the strength, and the numeral 14 is an integrated cover for the motor 9 and the bearing body 12.

Furthermore, in order to prevent vibrations from occurring in the drive body 1 due to high-speed rotation of the drive body 1, a support body 15 that pivotally supports the lower end of the drive body 1 is connected, for example, to the base plate 7 via a rond or the like. It may be better to fix the lower end of the outer shell 2 to the support weight 5 described above to prevent the outer shell 2 from vibrating due to the high-speed rotation. In this case, the lower end opening 4 of the outer shell 2 is opened in the upper end peripheral wall.

Next, an example of operation of the illustrated embodiment will be shown.

The outer shell body 2 has an inner diameter of 61 mm and a height below the water surface of 930 mm, an outer diameter of 35 mm and a height below the water surface of 1070 mm.
The device of the present invention is constructed by assembling the driver 1 adjusted to
When the device was rotated at 8,000 to 11,000 rpm, the interior of the cup, which was filled with water and held upside down approximately 15 meters away from the device of the present invention, was replaced with air after approximately 3 hours, indicating that at least no gas was generated. It was confirmed that air bubbles were scattered around 15 meters.

〔Effect of the invention〕

As is clear from the above description, according to the stirring and mixing device for liquid and gas of the present invention, it is possible to emit air bubbles with extremely small diameters over a wide range of water, and the air bubbles have extremely small diameters. Therefore, it does not rise to the surface of the water in a short time due to its own buoyancy, but remains in the water for a long time while moving irregularly, effectively removing oxygen and nitrogen from the air. Therefore, it has many excellent effects, such as being extremely useful for water purification and fish and shellfish farming.

[Brief explanation of drawings]

The drawing is a front view, partially in longitudinal section, of an apparatus for stirring and mixing liquid and gas according to the present invention. Explanation of symbols 1; Drive body; 2; Outer shell; 3; Upper end opening; 5; Gap;
6; radiation piece. To the beggar a

Claims (1)

[Claims] An upper end opening (3
); a straight cylindrical outer shell (2) which is disposed so as to protrude above the surface of the liquid to be stirred and mixed; a straight cylindrical drive body which is inserted and assembled coaxially into the outer shell (2) over the entire length of the outer shell (2) and is driven to rotate at a high speed of 8000 [rpm] or more; (1), a dissipating piece (6) is provided protrudingly on the lower peripheral surface of the driving body (1) protruding from the lower end of the outer shell (2), and the outer shell (2) and the driving body When the driving body (1) rotates at high speed, the liquid flows into the gap (5) between the gap (1) and the gap (5).
A device for stirring and mixing liquid and gas, which is set to the lowest possible value within the range that can be inserted into the interior of the device.