JPS63224725A - Agitating and mixing device for liquid and gas - Google Patents

Abstract

PURPOSE:To discharge fine bubbles into water, by constituting the device with a straight cylindrical sheath body, a straight pillar type driving body, and a supporting body which protrudes from the lower end of the sheath body and supports the lower end part of the driving body. CONSTITUTION:The liquid flows into a clearance 6 between the sheath body 3 and the d riving body 1 from the lower end of the sheath body 3, and the upper opening part 4 of the sheath body 3 is always opened so that the gas is supplied into the clearance 6. When the driving body 1 is revolved with high speed of >=8,000rpm, the liquid and the gas which are in the clearance 6 are rotated following the revolving motion of the driving body 1, and are drawn downward. The gas drawn into the liquid by the swirling motion is furiously agitated by the liquid, and is broken into small pieces to form fine bubbles by high speed revolving motion of the driving body 1 and the furious swirling motion of the liquid.

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 a large number of bubbles into the water. The bubbles in the liquid obtained by these devices are so large that they rise to the surface of the liquid 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 agitation and mixing device described above does not dissolve much air into the water, so the agitation 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 opening of the outer shell.

It is true that the invention disclosed in Japanese Patent Publication No. 61-36448 has excellent ability to stir and mix gas and liquid, and can dissolve gas into liquid very efficiently. Since it is necessary to rotate the drive body inserted into the body with a narrow gap between it and the outer shell, slight mechanical vibrations may occur during the high-speed rotation of the drive body. When liquid waves occur, and this vibration or wave causes a slight shake in the drive body, this slight shake is amplified by the high-speed rotational movement of the drive body itself, resulting in large vibrations. This results in a defective stirring and mixing operation of the gas and liquid, and in some cases, there is a risk that the device itself may be mechanically destroyed.

The present invention aims to solve the above-mentioned drawbacks and inconveniences. It is an invented stirring and mixing device for liquid and gas, which is capable of stirring and mixing a large amount of liquid with gas in a short period of time. When doing so, the technical challenge is to be able to operate it in a stable state.

[Means for solving problems]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to 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 linear cylindrical outer shell 3, a linear cylindrical driver 1, and a support 7.

The outer shell 3 is arranged such that the upper end opening 4, 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 3 described above, and has an extremely smooth outer circumferential surface, and has a coaxial center within the outer shell 3 over the entire length of the outer shell 3. It is inserted and assembled into a motor and is driven to rotate at a high speed of 8000 rpm or more.

Next, the support body 7 pivotally supports the lower end portion of the drive body 1 protruding from the lower end of the outer shell body 3.

The gap 6 formed between the outer shell 3 and the driving body 1 described above is such that liquid flows into this gap 6 when the driving body 1 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 8,000 [rpm] to 11,000 [rpm].
This is to reduce friction with the liquid as much as possible since it is rotated at an extremely high speed of approximately [rpm].

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 6 formed between the outer shell 3 and the driving body 1 from the lower end of the outer shell 3, and the outer shell 3 Since the upper end opening 4 is always open, gas is supplied from the upper end opening 4.

When the driver 1 is rotated at a high speed of 8000 Cpm or higher from this state, the gap 6 contacting 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 opening at the lower end of the outer shell 3 together with the liquid that is violently swirling.

During this operation, the drive body 1 rotating at high speed has its lower end pivotally supported by the support 7, and its upper end is held, so it is not affected by external forces such as vibrations applied from the outside. Regardless of the situation, the rotary operation is always performed in a stable and constant posture, thereby achieving stable formation of thin bubbles and dispersion of the bubbles.

As mentioned above, the vortex motion can generate a large amount of extremely fine microscopic bubbles in the liquid, so the gas is reliably dissolved into the liquid and mixed, and this state is maintained for a long time. It becomes possible to do so.

〔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 3 is fixed at its upper end to a base plate 8 which is immovably disposed directly above the water surface, with its upper end opening 4 not being closed.

Furthermore, since it is conceivable that the outer shell 3 may also vibrate due to the high speed rotation of the driver 1, it would be a good idea to also fix the lower end of the outer shell 3 to the support 7. In this case, the lower end opening 5 of the outer shell 3 is opened at the lower end of the peripheral wall.

In the illustrated embodiment, the support body 7 is connected and fixed to the base plate 8 via irons or the like.

A plate 9 is fixed on the base plate 8 with a fixed interval between it and the base plate 8, and a motor 1o, which is a driving source, is fixed to the plate 9.

In order to install the motor 10, a bearing body 13 is fixed to the plate 9, which firmly holds the upper part of the drive body 1, which is coaxially inserted and assembled into the outer shell body 3 and extends upward. hand,
Together with the support body 7 described above, the drive body 1 is held so that it can rotate at high speed in a stable state without vibration.

Note that a boot 1 is fixed to a portion of the driver 1 located in the gap between the base plate 8 and the mounting plate 9, and is fixed to the motor shaft of the motor 10 so that the base plate 8 and the mounting plate 9 are connected to each other. Board 9
A transmission belt is passed between the drive boot 1 and the drive boot 2 located between the drive body 1 and the drive body 1, so that the drive body 1 is rotated by the motor 10.

In addition, reference numeral 14 in the figure is a mounting bracket, and the above-mentioned bearing body 1
The attachment 3 is provided to further increase the strength, and 15 is an integrated cover for the motor 10 and the bearing body 13.

Further, a flange-like or projecting piece-like dissipating piece 16 is provided on the lower circumferential surface of the driving body 1 protruding from the lower end of the outer shell 3. A radial water flow is formed in the water at the lower end of the shell 3. Therefore, water mixed with air discharged from the lower end opening 5 of the outer shell 3 can be dispersed over a wide range in all directions by riding on this water flow.

〔Effect of the invention〕

As is clear from the above explanation, according to the stirring and mixing device for liquid and gas of the present invention, it is possible to achieve stirring and mixing operation in a stable state, and it is possible to release bubbles of extremely small diameter into the water. Since the bubbles are extremely small in diameter, they do not rise to the surface of the water in a short period of time due to their own buoyancy, but remain in the water for a long time while moving irregularly, and are suspended in the air. Oxygen and nitrogen can be effectively dissolved into water, and therefore, it has many excellent effects, such as being extremely beneficial for water purification and fish and shellfish farming.

[Brief explanation of the drawing]

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 I; driving body; 3; outer shell; 4; upper end opening; 6; gap;
7; Support.

Claims (1)

[Claims] An upper end opening (4
); a straight cylindrical outer shell (3) disposed so as to protrude above the surface of the liquid to be stirred and mixed; and an outer circumferential surface that is longer than the outer shell (3) and is extremely smooth. a straight cylindrical drive body which is inserted and assembled coaxially into the outer shell (3) over the entire length of the outer shell (3) and is driven to rotate at a high speed of 8000 [rpm] or more; (1), and the driving body (1) protruding from the lower end of the outer shell (3).
) and a support (7) that pivotally supports the lower end of the outer shell (3) and the gap (6) between the outer shell (3) and the drive body (1) when the drive body (1) rotates at high speed. The liquid fills the gap (6)
A stirring and mixing device for liquid and gas that is set to the lowest possible value within the range that can be inserted into the interior.