JPS60227891A - Series rotary type aerator - Google Patents

Abstract

PURPOSE:To revolve axially, stably and smoothly a cylindrical body by connecting a part to be immersed into a liquid surface, a part projecting from the liquid surface and the revolving shaft of an induction motor in series. CONSTITUTION:The cylindrical body 2 consists of a part 21 for projecting from the liquid surface having a small diameter and vent holes 22 for air suction and a part 23 to be dipped into the liquid surface having a large diameter and many small holes 24. The end of the part 21 of the body 2 is connected directly to the revolving shaft 11 of the motor 1 via a rubber tube 26 in series thereto. The axial revolution of the cylindrical body is thus made stable and smooth and the cylindrical body has durability. Fine foam is effectively and efficiently supplied into the liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Technical Field The present invention relates to a long-life rotary aerator whose cylindrical body is entirely connected in series with the rotating shaft of an induction motor.

11 BACKGROUND TECHNOLOGY Conventionally, as a bubble generation method in an aerator, a blow or spray method in which air is generated via a compressor and a porous piping system has been known.

However, in the case of one-type air blowers, etc., the diameter of the bubbles as a unit of supply is too large, and the individual bubbles tend to combine to form a bubble mass, causing most of the supplied air to float to the liquid surface and dissipate.
The amount dissolved in the dead liquid is very small, and as a result, the effective value for water treatment, etc. relative to the amount of air supplied is poor, and the energy efficiency is also poor.

The present invention overcomes the above-mentioned drawbacks and provides an aerator with a simple structure and long life.

111 DISCLOSURE OF THE INVENTION The rotary aerator of the present invention includes a cylindrical body connected in series with the rotating shaft of an induction motor.

Hereinafter, the present invention will be explained with reference to the embodiments shown in the drawings.

In the figure, 1 is an AC motor, 2 is a cylindrical body, and 8 is a float. The cylindrical body consists of a small-diameter liquid level protrusion 21 and a large-diameter liquid level immersed part 28, and the liquid level protrusion tC has a large number of vent holes 22 for sucking air all around its side periphery. ing. In addition, the liquid surface immersion part has a large number of small holes 24 for generating microbubbles in the liquid, and one end 25 of the holes is closed to prevent liquid from entering due to the pressure difference. ing.

On the other hand, the end of the cylindrical body on the side where the liquid surface protrudes is connected to a rubber tube 26f.
The cough motor 1 is directly connected to the rotating shaft 11 of the cough motor 1 through the T without adjusting its shaft diameter, and is connected in series to the rotating shaft. This is 0. The rotational force is transmitted to the cylindrical body while the vibration of the motor is absorbed based on the cushioning properties of the rubber tube.
, the disturbance of the axis of rotation of the cylindrical body is prevented or suppressed. When the cylindrical body rotates, fine air bubbles are discharged from the small holes of the liquid level immersion part 23 immersed in the liquid based on the centrifugal force. On the other hand, in response to the reduced pressure within the cylindrical body due to the discharge, air is sucked through the vent hole 22 in the liquid level protrusion of the cylindrical body and replenished.

The float 8 is used to maintain the vent hole above the liquid level so that air can be suctioned from the vent hole in the liquid level protrusion of the cylindrical body. Further, in the embodiment, the entire support frame 31 functions as a support for the motor and, furthermore, for the cylindrical body. The float H1 consists of a closed container, and is arranged at a position where the F part 23 of the cylindrical body can be immersed below the liquid level. In this way, in the example, a float type is provided with a flow If, so it is easy to handle, and it is easy to install, collect, and
It has the advantage of being easy to maintain and manage, being able to be easily moved above the liquid surface, and being able to be placed where it is needed, as well as being easily applicable even when the installation location has a large liquid depth. are doing.

Of course, the float is not essential in the present invention, and may be reinstalled in a predetermined state by, for example, attaching a support frame or using appropriate facilities at the installation location.

In the present invention, the diameter of the portion of the cylindrical body located near the liquid surface is preferably as small as possible. As the axis of the cylinder rotates, turbulence (rL) such as a downward movement of the liquid surface near the cylinder due to the centrifugal force of the rotating liquid, and this turbulence (r This is because it is advantageous in preventing coarsening.

On the other hand, the diameter of the bubble generating part of the cylindrical body is preferably large in order to obtain a large centrifugal force with a small number of revolutions. Also,
As for the shape of the bubble generating portion, a tapered shape with a woody shape at the bottom is preferable from the viewpoint of uniformity of bubble generation in the liquid depth direction.

A suitable taper shape is a paraboloid of revolution, but this
but not limited to. Of course, a planar pipe-like structure may also be used.

In the present invention, air is supplied into the liquid as fine bubbles that are advantageous for wide-area diffusion and residence time in the liquid.
The fineness of the bubbles depends on the rotational speed of the cylindrical body and the diameter of the bubble generation area (
centrifugal force), the diameter of the small hole, etc. Generally, the larger the centrifugal force caused by the shaft rotation speed of -f: or the smaller the diameter of the small hole, the finer the supplied bubbles will be.

When the cylindrical body has a general shaft rotation speed of 1800 to 1800 r,p,m when connected in series with an induction motor, and the diameter of the bubble generating part is 10 to 156n, the hole diameter is 0.1 to 2, preferably 0.8. ~1.5 wx, particularly preferably 05-1
That is, a suitable number of holes is 0.5 to 8/a+1 (assuming a hole diameter of 1 m).

The particle size of the microbubbles obtained under these conditions varies depending on the liquid conditions, but is usually 1 square or less. Of course, it is not limited to these numerical ranges.

The general size of the aerator of the present invention considering the ease of handling is the length of the cylindrical body of 80 to 100 crn and the diameter of 8 to 20 crn.
t: m, total height 50-150 cm, etc., and 7
However, the present invention is not limited to this, and may be larger or even smaller.

Note that by using a gas other than air as the atmospheric gas, the present invention can of course also be applied as a submerged supply device for the gas.

1v Advantages of the Invention According to the present invention, since the rotating shaft of the induction motor and the cylindrical body are connected in series, stable and smooth shaft rotation of the cylindrical body can be achieved. Compared to the case where the rotational force is transmitted from the direction perpendicular to the rotational axis direction through the motor, the load on the motor or the cylindrical body can be reduced, and the durability is improved (long life).

Further, since the structure is simple and assembly is easy, it also has the advantage of being easy to manufacture.

Furthermore, since the bubbles are discharged based on centrifugal force, fine bubbles can be effectively, efficiently, and even energy-efficiently supplied into the liquid. As a result, the buoyancy of the bubbles becomes smaller and the solution easily penetrates into the liquid, reducing the amount that floats to the liquid surface and dissipates, making it possible to form a liquid with a high gas content. The effective amount can be set to "kK".

In addition, since it is easy to unitize, it can be used in systems for various purposes and regulations, and has the advantage of having a wide range of applications.

[Brief explanation of drawings]

The figure is a partial sectional view schematically showing a serial rotary aerator that is an embodiment of the present invention. l: AC motor, 2: Cylindrical body, 8: Float, 22: Ventilation hole in the liquid level protruding part, 24: Small hole in the liquid level immersion part, 26: Rubber tube Patent applicant Dainichi Nippon Electric Cable Co., Ltd. Agent Fuji Tsutomu Hon

Claims (1)

[Claims] l. A liquid level protruding portion of a cylindrical body having a closed end, a liquid level immersed portion having a large number of small holes, and a liquid level protruding portion having a ventilation hole, and a rotating shaft of an induction motor. A series rotary aerator characterized by being connected in series. 2. The aerator according to claim 1, wherein the liquid level protrusion of the cylindrical body is connected to the rotating shaft of an induction motor via a buffer tube. 3. The aerator according to claim 1, further comprising a float attached to the cylinder to maintain the vent hole above the liquid level.