JPS59130525A - Device for agitating and mixing liquid and gas - Google Patents

Abstract

PURPOSE:To dissolve efficiently a gas in a liquid by generating extremely small gas bubbles by means of violent eddy motion of the liquid. CONSTITUTION:A linear, cylindrical outer shell 2 is arranged by protruding the upper end of its opening 3 opened in the atmosphere of a gas to be mixed from the level of a liquid to be mixed, and a linear, cylindrical, driving body 1 which is inserted into the shell 1 and fitted concentrically thereto throughout its whole length and is driven at a high speed of >=7,000rpm, is provided to the inside of shell 2 having the length larger than that of the shell 2 and the extremely smooth outer peripheral surface. A gap 5 between the body 1 and the shell 2 is set as small as possible within a range that the liquid is able to enter and stay in the gap 5 when the body 1 is driven at high speed. Extremely small gas bubbles are generated by this violent eddy motion to dissolve the gas in the liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for stirring and mixing liquid and gas, and more specifically, its purpose is to more efficiently dissolve gas into liquid.

A device for dissolving air or other gas into a liquid such as water uses a compressor or blower to forcefully send air into a pipe placed in the water, and through a large number of small holes in this pipe. There are methods in which air is ejected into the water as bubbles, and methods in which a water wheel is rotated by a driving device such as a motor at the surface of the water to generate intense water spray, and this water spray scrapes a large number of bubbles into the water. The underwater bubbles produced by these devices are so large that their own buoyancy forces them to rise to the surface within a short time, giving the air enough time to dissolve into the water. I couldn't do that.

The above-mentioned stirring and mixing device for liquid and gas is used in many fields such as aquaculture and water purification, but there is a strong demand for stirring and mixing devices that can dissolve a larger amount of gas into the liquid. 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 increase in the water, but also the appearance of blue-green algae, which is often extremely inconvenient for aquaculture.

The present invention was devised to eliminate the drawbacks, problems, and dissatisfaction of the conventional examples described above and to meet the demands. Extremely small bubbles in a liquid have their own buoyancy due to a phenomenon similar to Brownian motion. By focusing on the fact that it is possible to overcome this problem and remain irregularly floating in the liquid for a long period of time, we have made it possible to generate extremely small bubbles by the violent swirling movement of the liquid.

Examples of the present invention will be described below with reference to the drawings.
In the following description, for the sake of simplicity, an example will be described in which water is used as a liquid and air is used as a gas.

The stirring/mixing device according to the present invention has a straight cylindrical outer shell 2 disposed with an upper end opening 3 opened into the air protruding above the water surface, and a length larger than this outer shell 2. A linear cylindrical drive having an extremely smooth outer circumferential direction, coaxially inserted and assembled into the outer shell 2 over the entire length of the outer shell 2, and driven to rotate at a high speed of 700 [rpm] or more. The gap 5 between the outer shell body 2 and the driving weight is within the range of values that allow water to enter the gap 5 when the driving body 1 is driven to rotate at high speed. It is configured to be set to the lowest possible value.

In the embodiment shown in FIG. 1, the upper end of the outer shell 2 is fixed to a base plate 6 which is immovably disposed directly above the water surface, with the upper end opening 3 thereof not being closed.

A plate 7 is fixed on the base plate 6 at a constant distance I14 from the base plate 6, and a motor 8 serving as a driving source is fixed to the plate 7.

In order to install the motor 8, a bearing body 11 is fixed to the plate 7, 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.

A pulley 0 is fixed to a portion of the driving body 1 located in the space between the base plate 6 and the mounting plate 7, and is fixed to the motor shaft of the motor 8, and the pulley 0 is fixed to the motor shaft of the motor 8 between the base plate 6 and the mounting plate 7. A transmission belt is passed between the drive pulley 9 located at the drive pulley 9, and the drive body 1 is rotated by the motor 8.

Note that 12 in FIG. 1 is a mounting bracket provided to further increase the mounting strength of the bearing body 11, and ]3 is a mounting bracket for the motor 8.
and a cover for the bearing body 1].

The outer peripheral surface of the driving body l, which is the main part of the device of the present invention, is polished to an extremely smooth surface.
This is to minimize friction with the water as it rotates at extremely high speeds of pm3 or higher.

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.

The outer diameter of the driving body 1, the value of the gap 5, the length of the outer shell 2, that is, the length of the driving body 1 located in the water, etc., are determined by the rotational speed of the driving body 10, the motor 8 used, etc. horsepower of the driving source,
Further, it is selected and set depending on the required stirring capacity per unit time.

For example, if the diameter of the driver 1 is set to 27φ, the length of the outer shell 2 is 1300 [long] (about 1200 [long] underwater).
The gap 5 had a strength of 3 to 6, which was optimal.

Under the above dimensional conditions, drive body 1 is rotated at 8000 (rpm)
When rotated at ~9000 [rp+n], a large amount of air bubbles of about 1/100,000 [so-called] size are ejected into the water from the lower end opening 4 of the outer shell 2, and the air bubbles are extremely small in size and therefore last for a long time. Leave it floating in the water for a period of time.

The above-mentioned bubbles ejected into the water cannot be seen by the human eye as they are. It is possible to see things in the form of white, shining particles.

By the way, according to the inventor's experiments, among the above-mentioned dimensional relationships, when the length of the outer shell 2 is shortened, the diameter of the generated bubbles tends to increase; It was found that if the rotation speed was increased, an overload state occurred and the desired rotation speed could not be obtained.

Furthermore, if the value of gap 4 is increased to around 10[IW+E], the diameter of the generated bubbles tends to increase.On the other hand, if it is set to 3[gap] or less, it becomes difficult for water to enter into gap 4, and It was not possible to obtain a suitable amount of air bubbles.

In this way, the mutual dimensional relationship among the diameter of the driving body 1, the value of the gap 4, and the length of the outer shell 2, that is, the length of the driving body 1 in water, is set and determined according to the rotational speed of the driving body 1. That's why.

As described above, the stirring and mixing device according to the present invention releases a large amount of air bubbles with an extremely small diameter of 1/100,000 [m] into water, and the air bubbles released into water according to the present invention are as described above. , whose diameter is so small that it remains underwater for a long time, moving irregularly, without rising to the surface in a short time due to its own buoyancy. Therefore, oxygen and nitrogen from the air are effectively dissolved into the water.

By the way, the bubbles obtained by the device of the present invention are generated when the water in the gap 5 becomes a violent vortex due to the high-speed rotation of the driving body 1. Since the ejected water is ejected downward along the line, and the ejecting direction is restricted, it is difficult to disperse it over a wide area underwater in a short period of time.

Therefore, as shown in FIGS. 2 and 3, the driving body 1 is made into a straight cylindrical body, and a ventilation passage 14 is formed inside the driving body 1, which opens at both the upper and lower end surfaces of the driving body 1, and the opening at the lower end of the outer shell 2. 4
At the lower end of the driving body 1 protruding from the bottom, there is a bottom body 15 having a short cylindrical shape with a bottom and having a plurality of air release holes 16, which are small holes, in the peripheral wall.
It is preferable to attach and fix them coaxially with their internal spaces communicating with the ventilation passage 14.

In the case of the embodiment shown in FIGS. 2 and 3, when the driver 1 is driven to rotate at high speed, a large amount of water is released from the lower end opening 4 of the outer shell 2 due to the action of the driver 1 and the outer shell 2. Fine bubbles are ejected in exactly the same way as in the embodiment shown in FIG. Due to the ejected air bubbles, there are
A radial water flow will be formed.

Therefore, a large amount of extremely fine air bubbles ejected downward from the lower end opening 4 of the outer shell 2 are dispersed in all directions by the above-mentioned radial water flow.

As described above, the stirring/mixing device according to the present invention can generate a large amount of extremely fine microscopic bubbles in water, so that the dissolution of oxygen and nitrogen in the air into water can be achieved extremely effectively. be able to.

For this reason, not only can ammonia and organic matter in water be decomposed quickly, but also can kill blue-green algae, thereby making it possible to powerfully purify water.

In addition, by attaching an ozone generator to the upper opening 3 of the outer shell 2, the newly generated ozone can be dissolved into the water in a short time, thereby achieving strong sterilization of the water. You can also.

Furthermore, if a heating element such as a heater is attached to the upper opening 3 of the outer shell 2 and hot air is supplied to the gap 5, the water can be heated in a very natural manner.
This makes it extremely effective for keeping aquaculture ponds warm in cold regions.

As is clear from the above description, the liquid and gas stirring and mixing device according to the present invention has an extremely simple structure and is easy to handle, so it is easy to manufacture and use, and can be obtained at low cost. In addition, since the bubbles that are generated are extremely fine, the time that the bubbles stay in the liquid is extremely long, and therefore the amount of gas dissolved in the liquid per unit time can be sufficiently increased. It has many excellent effects, such as being extremely beneficial for water purification and fish and shellfish farming.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal front view showing an embodiment of the apparatus of the present invention. FIG. 2 is a perspective view of essential parts showing another embodiment of the device of the present invention. FIG. 3 is a vertical cross-sectional view of a main part of the embodiment shown in FIG. 2. Explanation of symbols 1: Drive body 2: Outer shell 3: Top opening 4: Bottom opening 5: Gap 4: Ventilation passage 15: Bottom body 16: Air vent up/D 3 Tabun l Linda 3 Backward 1 O

Claims (2)

[Claims] (1) A linear cylindrical outer shell whose upper end opening into the gas atmosphere to be mixed projects above the surface of the liquid to be mixed, and a shell having a length greater than that of the outer shell. and has an extremely smooth outer circumferential surface, and is coaxially inserted and assembled into the outer shell over the entire length of the outer shell.
and a linear cylindrical driving body that is driven to rotate at a high speed of 0.00 [rpm] or more, and the liquid enters the gap between the outer shell and the driving body when the driving body rotates at high speed. A device for stirring and mixing liquid and gas, which is set to the smallest possible value within the range where the intrusion can occur. (2) A straight cylindrical outer shell whose upper end opening into the gas atmosphere to be mixed projects above the surface of the liquid to be mixed, and a shell having a length larger than that of the outer shell. and has an extremely smooth outer circumferential surface, and is coaxially inserted and assembled into the outer shell over the entire length of the outer shell.
A linear cylindrical driving body that is rotationally driven at a high speed of 00 [rpm] or more, and a lower end of the driving body protruding from a lower end opening of the outer shell body, and an internal space communicating with a ventilation path inside the driving body. The bottom body is fixed coaxially with a solid wall and has a cylindrical shape with a bottom and has a large number of ventilation holes in a solid wall, and the gap between the outer shell body and the driving body is A stirring and mixing device for a liquid and a gas, which is set as small as possible within a range that allows the liquid to enter the gap during high-speed rotation.