JPS63224722A - Agitating and mixing device for liquid and gas - Google Patents

Abstract

PURPOSE:To discharge fine bubbles into water, by providing a straight pillar type driving body which is revolved with high speed of >=8,000rpm and is coaxially inserted all over the length into a sheath body. CONSTITUTION:When the driving body 1 is revolved with high speed of >=8,000rpm, the liquid and gas which are in a clearance 7 and are brought into contact with the outer peripheral surface of the driving body 1 are furiously rotated following the driving body 1 revolved with high speed, and are drawn downward in a furious swirling motion, and the drawn gas is furiously agitated by the high speed revolving motion of the driving body 1 and the furious swirling motion of the liquid, and is broken into small pieces to form extremely fine bubbles. Thus, the formed extremely fine bubbles accompanied with the furious swirling motion are vigorously spouted from the lower opening of the sheath body 2.

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 surface of the liquid within a short time due to the buoyancy of the bubbles themselves, making it difficult for the gas to dissolve into the liquid. It was not possible to keep the bubbles in the liquid for a long period of 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. It was wanted.

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. 61-36448 states that even if a gas has a much lower specific gravity than a liquid, if it forms extremely small bubbles and is located in the liquid, the bubbles will form due to a phenomenon similar to Brownian motion. Focusing on the fact that it is possible to overcome the buoyant force that acts on the liquid and stay in the liquid for a long period of time while floating irregularly, by creating a violent whirlpool movement in the liquid in the gas atmosphere, the gas in the liquid can be By generating extremely small 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, and the liquid in the gap is stirred and mixed with the gas by the intense vortex movement generated by the high-speed rotational movement of the driving body. Liquid containing bubbles is discharged downward from the lower end opening of the outer shell.

As shown in 2, since the liquid is supplied into the gap from the upper opening of the outer shell, which is the outlet for the liquid containing many fine bubbles, it is possible to The liquid level in the gap inevitably becomes low, and therefore the actual height of the liquid located in the gap and stirred by the driving body is equal to the height of the gap formed between the outer shell and the driving body. As a result, the actual stirring time for the liquid is shortened, resulting in the dissatisfaction that a large number of sufficiently small bubbles cannot be generated.

Of course, by making the lengths of the outer shell and the driving body sufficiently large, the height of the liquid in the gap can be made to a value that can generate a large number of sufficiently small bubbles. As the height of the body and the driving body increases, mechanical manufacturing constraints such as completely preventing vibration and wobbling of the driving body and the outer shell which are rotated at high speed and the depth of the liquid increase. This will make implementation extremely difficult due to the constraints of the installation conditions.

In addition, the liquid released from the gap and the liquid trying to enter the gap flow in opposite directions and exert a braking effect on each other, so the discharge of the agitated liquid There is a dissatisfaction that the force of stirring is weakened, and as a result, the stirred liquid cannot be scattered far.

For example, an outer shell with an inner diameter of 61 mm and a height below the water surface of 930 nw has a diameter of 35 mm and a height below the water surface of 107 nw.
The device constructed by assembling the drive body adjusted to 0 mm is 8
When rotated at 000-11000 (rpm),
The water level in the gap during operation, which is the length of the substantial part where liquid and gas are agitated and mixed, is 45 mm from the lower end opening of the outer shell.
As a result, the diameter of the formed bubbles is large, about 10-1 to 1.0-'mm, and the diameter of the formed bubbles from the upper opening of the outer shell is large. The ejection force is also weaker than expected due to the lack of distance for swirl formation and the fact that the ejection action is inhibited by the liquid flowing into the gap. In this way, due to the large diameter of the formed bubbles and the weak release force, the bubbles released into the water reach the water surface within a range of about 5 meters around the device within a relatively short time. It had surfaced.

The present invention aims to eliminate the drawbacks and inconveniences of the prior art described in "-". The liquid discharged downward is supplied into the gap by utilizing the landing motion of the water level within the gap, and the supply operation of this liquid into the gap interferes with the discharge operation of the mixed fluid of gas and liquid. The technical challenge is to prevent this from occurring.

Means for Solving Problem C] The present invention will be described below with reference to a concave surface showing an 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 body 2 has a cylindrical wall 3 arranged such that an upper end opening 4 that opens into the gas atmosphere to be stirred and mixed protrudes above the surface of the liquid to be stirred and mixed, and the cylindrical wall 3 in the liquid 3 has a structure in which a window hole 6 is opened in the upper part.

Further, the driving body I has a longer length than the above-mentioned outer shell 2 and has an extremely smooth outer circumferential surface. They are inserted and assembled coaxially and rotated at a high speed of 8000 Cpm 3 or more.

The gap 7 formed between the outer shell 2 and the driving body I described above is such that liquid flows into this gap 7 when the driving body I rotates at high speed.
The value is set as small as possible within the range where the intrusion position can be located.

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 water as much as possible since it is rotated at an extremely high speed of about Crprn 3.

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.

[Function] In the above-described configuration, the window hole 6 in the cylindrical wall 3 of the outer shell 2 is provided in the space r#, 7 formed between the outer shell 2 and the driving body 1.
, liquid enters from the lower end of the outer shell 2, and the outer shell 2 has its two-end opening 4 always open, so gas is supplied from the upper end opening 4. in a state.

When the driver 1 is rotated from this state at a high speed of 8,000 rpm or more, the liquid and gas in the gap 7 in contact with the outer peripheral surface of the driver 1 rotates following the rotational movement of the driver 1. , it makes a violent vortex motion and is drawn downward.The gas drawn into the liquid by the vortex motion is violently agitated with this liquid due to the high-speed rotation of the driver l and the violent vortex motion of the liquid. It is then subdivided and molded into extremely thin cells.

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

In this way, the gas and liquid in the gap 7 are discharged to the outside from the lower end opening of the outer shell 2 due to the high-speed rotating operation of the driver 1, so the liquid level in the gap 7 is lowered. However, there are window holes 6 in three locations on the cylindrical wall of the outer shell 2 directly below the liquid level.
Since this is opened, liquid is constantly supplied into the gap 7 through this window hole 6, and therefore the liquid level in the gap 7 will never fall below this window hole 6. ,
A sufficient height and width of the liquid that is stirred and mixed with the gas within the gap 7 can be maintained.

In addition, since the liquid is supplied into the gap 7 in this manner through the window hole 6 formed in the upper end of the cylinder wall 3, the liquid enters the gap 7 from the lower end opening of the outer shell 2. Therefore, the air bubbles released to the outside from the lower end opening of the outer shell 2 are released without their force being inhibited.

〔Example〕

In the following explanation, water is used as a liquid, and gas = 10- The following describes the case where air is used.

In the case of the illustrated embodiment, the outer shell 2 is fixed at its upper end to a base plate 11 which is immovably disposed directly above the water surface, with its upper end opening 4 not being closed.

A plate 12 is fixed on the base plate 11 with a fixed interval between it and the base plate 11, and a motor 13 serving as a driving source is fixed to the plate 12.

When installing this motor 13, the outer shell 2 is attached to the plate 12.
A bearing body 16 is fixed to firmly hold the upwardly extending upper part of the drive body 1, which is coaxially inserted and assembled into the drive body 1, and allows the drive body 1 to rotate at high speed in a stable state without vibration. Hold on as long as you can.

In the embodiment shown in FIG. 1, a support 10 is disposed at the lower end of the drive body 1 in order to more reliably suppress this vibration.

That is, the support body 10 is immovable by being connected and fixed to the base plate 11 described above via a rod or the like within the liquid, and the shaft pin 9 extending from the lower end of the drive body 1
This supporting body 10 and the above-mentioned bearing body 16 support both ends of the driving body 1, making it possible to rotate the driving body 1 at high speed in a stable state without vibration.

Furthermore, even if the shaft support of the driving body 1 is achieved by the above-mentioned means, the high speed rotation of the driving body 1 causes the outer shell 2 to
It is also possible that it may vibrate.

Therefore, it is conceivable to also fix the lower end of the outer shell 2 to a part of the support 10 described above. In this case, the lower end opening 5 of the outer shell 2 will be opened in the upper end peripheral wall of the outer shell 2.

In the embodiment shown in FIG. 2, the lower end of the outer shell 2 is slightly extended downward, and the lower end of the driver 1 is connected to the lower end of the outer shell 2 via a support 10. 2 prevents the lower end of the driving body 1 from wobbling. In the case of the embodiment shown in FIG. 2, the support body 10 only needs to connect the outer shell body 2 and the driving body 1, so that its installation is easy. Since the outer shell 2 is configured to extend downward, it goes without saying that an opening for releasing air bubbles is provided at its lower end.

The window hole 6 of the outer shell 2 is opened in the portion of the cylinder wall 3 that is underwater so that water can always enter the gap 7, but dirt does not enter the gap 7 when water enters. like,
It would be a good idea to cover the window hole 6 with something like a net 6a.

In addition, when the water mixed with air released from the lower end of the outer shell 2 is released downward from the lower end opening 5 of the outer shell 2 along the vortex, the direction of its release is regulated. This makes it difficult to disperse over a wide area underwater in a short period of time.

Therefore, in the illustrated embodiment, a dissipating piece 8 is provided on the circumferential surface of the lower end of the driver 1 that protrudes from the lower end opening 5 of the outer shell 2. This dissipating piece 8 may be in the shape of a flange or in the form of a plurality of protruding pieces.
A water flow is formed in the radial direction in the water directly below the lower end opening 5.

Therefore, water mixed with air discharged from the lower end opening 5 of the outer shell 2 can be carried by this water flow and dispersed in all directions.

A boo 1J14 is fixed to the part of the driver 1 located in the gap between the base plate 1 and the mounting plate 12, and is fixed to the motor shaft of the motor 13, so that the base plate 11 and the mounting plate are fixed to each other. A transmission belt is passed between the drive pulley 15 located between the drive body 12 and the drive pulley 15, and the drive body 1 is rotated by a motor 13.

In addition, 17 in the figure is a mounting bracket, and the bearing body 1 described above is
The attachment 6 is provided to further increase the strength, and the numeral 18 is an integrated cover for the motor 13 and the bearing body 16.

Next, an example of operation of the apparatus of the present invention will be shown.

It is a rectangular fish pond with a width of 264 meters and a depth of 1.3 meters.The water surface is covered with bluefin mud, and the large number of fish such as eels, carp, and carp kept in the pond for a long time. All had deformed vertebrae and white spots caused by a skin disease.

At one end of this fishpond, an inner diameter of 61 mm and a height of 9 mm below the water surface are installed.
30 mm outer shell 2, diameter 35 exposed, height below water surface 10
The device of the present invention, which is configured by assembling a 70 mm driver 1, is installed, and the driver 1 is heated to 8000 to 1l1000 (rp).
After 24 hours, all the bluefins died and precipitated, and the water in the pond became clear.

At the beginning of the operation of the device of the present invention, the fish in the pond simply gathered around the device, but gradually they began to eat the food provided.

One week after the start of operation, the skin disease in the fish was almost completely cured, and ammonia, the main cause of water spoilage, had disappeared. Furthermore, it was confirmed that eels, which are generally said to not eat food unless the water temperature is 20°C or higher, showed a marked appetite even at a water temperature of 14°C after operating the apparatus of the present invention.

According to measurements, the diameter of the bubbles formed by the device of the present invention and released into water is approximately 10 mm at maximum, and most of them are 10 mm or less, and the diameter of the bubbles formed by the device of the present invention is approximately 10 mm or less, and the diameter of the bubbles is approximately 10 mm or less. In addition, when a pot filled with water was placed upside down on the water surface 20 meters away from the device of the present invention, all the water in the pot was released after 3 hours. Furthermore, when the water was irradiated with a strong linear beam of light, the part through which this light passed was visible as a white line due to air bubbles, but when the operation of the device of the present invention was stopped, after 2 hours This white line is no longer visible, and the bubbles formed by the device of the present invention remain visible for 2 hours.
I was able to confirm that it was located underwater.

Although it is unclear why the skin disease in fish was completely cured by using the device of the present invention, it is thought that the oxygen in the formed bubbles exerts some kind of effect.

〔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, air bubbles of extremely small diameter can be released into water, and liquid and gas are constantly supplied to the stirring and mixing part. Since the bubbles are small in diameter, they are unlikely to rise to the surface of the water in a short period of time due to their own buoyancy. It remains in the water for a long time while moving irregularly, effectively dissolving oxygen and nitrogen from the air into the water, making it extremely useful for water purification and seafood cultivation. It has many excellent effects such as being beneficial.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal cross-sectional front view of a stirring and mixing device for liquid and gas according to the present invention. FIG. 2 is a front view of main parts showing another embodiment in which the lower end of the driver and the lower end of the outer shell are connected. Explanation of symbols 1; Drive body; 2; Outer shell; 3; Cylinder wall; 4; Upper end opening;
6; window hole, 7; gap. 117 = 1 day of 4

Claims (1)

[Scope of Claims] A cylindrical wall (3) disposed in such a manner that an upper end opening (4) opening into a gas atmosphere to be stirred and mixed with the liquid projects above the surface of the liquid to be stirred and mixed, and a cylinder wall (3) in the liquid. The outer shell (2) has a straight cylindrical shape with a window hole (6) formed in the upper part thereof, and has a longer length than the outer shell (2) and an extremely smooth outer circumferential surface. The outer shell (2) inside the shell (2)
It is inserted and assembled coaxially over the entire length of the 8000 [
The outer shell body (2) and the drive body (1) are composed of a straight cylindrical drive body (1) that is rotationally driven at a high speed higher than [rpm].
) is set to the smallest possible value within a range that allows the liquid to enter the gap (7) during high-speed rotation of the driving body (1). and gas stirring device.