JP2005000714A - Aerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aerator capable of performing an efficient aerobic operation for supplying air into water or a silent anaerobic operation for supplying no air into water with a simple mechanism only by switching the rotation direction of a motor, and keeping an installation position in relation to the water surface following the water level fluctuation. <P>SOLUTION: This aerator 1 is provided with agitation blades 3, 4 attached to a rotary shaft 2 driven by a motor 7, and a cylindrical body 5 disposed to cover the periphery of the shaft 2 from a part underneath the water surface to the water surface. The aerator 1 is supported with a float 8 to float on the water surface, and the agitation blades are divided into upper blades 3 disposed in the cylindrical body 5 and lower blades 4 always dipped in the contaminated water. The upper blades 3 are disposed above the water surface in the cylindrical body 5 in the aerobic operation, and at least the lower part thereof are disposed under the water surface in the cylindrical body 5 in the anaerobic operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aeration machine, and in particular, an aerobic operation (aeration operation) for supplying air (oxygen) into water and an anaerobic operation (stirring operation) without supplying air (oxygen) into water. The present invention relates to an aerator capable of quietly performing anaerobic operation with a simple mechanism and performing aerobic operation with high efficiency by simply switching the above.
[0002]
[Prior art]
Conventionally, when sewage treatment is performed by alternately switching between aerobic operation that supplies air into the water and anaerobic operation that does not supply air into the water, an aerator is installed near the surface of the sewage treatment tank. During operation, the rotating shaft driven by an electric motor is raised and rotated in one direction to suck up sewage, scatter sewage around like a fountain, and send air into the water by falling sewage. On the other hand, during anaerobic operation, the rotating shaft is lowered and rotated in the reverse direction to generate a water flow in the sewage and perform stirring.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional aeration machine, when switching between aerobic operation and anaerobic operation, in addition to switching the rotation direction of the rotating shaft that is rotationally driven by the electric motor, during aerobic operation, sewage is sucked up, On the other hand, when anaerobic operation is performed, a raising / lowering mechanism for raising and lowering the rotating shaft to which the stirring blades are attached is required during anaerobic operation, which complicates the structure of the aerator was there.
In addition, in order to simplify the structure, the apparatus for fixing the aerator has a problem in that during the anaerobic operation, the stirring blade comes into contact with the water surface and generates intense noise due to intermittent sound.
Furthermore, in order not to generate noise, when the lower part of the upper stirring blade is arranged above the water surface so as not to be immersed in the water surface, it is necessary to increase the pumping power by the lower stirring blade, so There was a problem that the suction was hindered and the efficiency of oxygen transfer power during aerobic operation was reduced.
[0004]
In view of the problems of the above-described conventional aerators, the present invention does not supply air to water efficiently by simply changing the rotation direction of the motor and performing aerobic operation for supplying air to water with a simple mechanism. An object of the present invention is to provide an aerator that can perform anaerobic operation silently, can follow fluctuations in the water level, and can maintain a fixed installation position relative to the water surface.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an aerator of the present invention comprises a stirring blade attached to a rotating shaft driven by an electric motor, and a cylindrical body arranged so as to cover the periphery of the rotating shaft from below the water surface to above the water surface. In the aeration machine provided, the aeration machine is supported by the float so as to float on the surface of the water, and the stirring blade is disposed in the cylinder, and the lower stirring blade is always immersed in the sewage. In addition, the upper stirring blades were arranged so that at least a part of the lower part of the upper stirring blade would be at the lower position in the cylinder water surface at the start of the aerobic operation so that the upper stirring blade would be at the upper position in the cylinder water surface during the anaerobic operation. It is characterized by.
[0006]
The aeration machine supports the aeration machine so that it floats on the surface of the water with a float, and an agitation blade is provided with an upper agitation blade disposed in the cylinder, and a lower agitation blade that is always immersed in sewage. And the upper agitating blade is arranged so that at least a part of the lower part of the agitating blade is at the lower position in the cylinder water surface at the start of the aerobic operation so that the upper stirring blade is in the upper position in the cylinder water surface during the anaerobic operation. During anaerobic agitation, the upper agitating blade can be lifted by the reaction force caused by the rotation of the aerator, so the upper agitating blade and the water surface do not come into contact with each other. In addition, following the fluctuation of the water level, the installation position of the aerator relative to the water surface can be kept constant, so a complicated lifting mechanism can be omitted, the structure of the aerator is simplified, and maintenance is easy. It can be obtained dependable high aeration machine.
[0007]
In this case, the aerator can be tethered with a rope so as to restrain the rotational reaction force due to operation.
[0008]
As a result, even if a rotational reaction force is generated by the operation of the aerator, the rotational reaction force can be restrained by the rope, and it can float and sink against fluctuations in the water level. A stable sewage can be aerated and anaerobically stirred.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the aerator according to the present invention will be described with reference to the drawings.
[0010]
1 to 3 show an embodiment of the aerator of the present invention.
FIG. 1 shows a state where the aerator 1 is installed in a rectangular sewage treatment tank and an aerobic operation is performed, and FIG. 2 shows a state where an anaerobic operation is performed.
[0011]
By the way, the sewage treatment tank A in which the aerator 1 is installed is not particularly limited, but has a required capacity of a rectangular shape that is widely used for sewage treatment. An aerator 1 is installed in the center of the.
This aerator 1 is floated on the surface of the water in the sewage treatment tank A by the float 8 and can cope with fluctuations in the water level. Further, the aerator 1 is attached to the rope 9 such as a wire so as to restrain the rotational reaction force due to the operation of the aerator. So that they are anchored and supported. Thereby, the aeration and stirring of the whole sewage of the sewage treatment tank A can be performed uniformly.
In this case, the length of the rope 9 is to follow the water level fluctuation so that the aerator 1 can float and sink within a certain allowable range so that the installation position of the aerator 1 with respect to the water surface can be kept constant. The setting is made so that a slight margin (sag) occurs in the neutral position.
[0012]
Moreover, although the aerator 1 supports the whole aerator with the float 8 in a floating state like the Example shown in FIG.1 and FIG.3, it can switch the rotation direction arrange | positioned on the water surface. A rotating shaft 2 having a length reaching a predetermined depth in water is vertically connected to the lower end of the drive shaft of the electric motor 7 that can be formed, and a cylindrical cylinder 5 that covers the periphery of the rotating shaft 2 with a predetermined interval. Is arranged from below the water surface to above the water surface, and further, two types of stirring blades 3 and 4 are attached to the rotating shaft 2.
Although this float 8 is not specifically limited, For example, it is made to attach to the outer peripheral part of the cylinder 5. FIG.
[0013]
The upper end of the cylindrical tubular body 5 is disposed at a predetermined distance from the upper surface of the aerator 1 so that sewage can be scattered around, and the lower end of the cylindrical body 5 is straight. Or it forms so that it may expand a little like a funnel shape so that it may make it easy to inhale in the cylinder 5 the dirty water of the tank bottom part of the downward direction of the cylinder 5.
[0014]
In addition, at the start of the aerobic operation, at least a part of the lower part of the two types of stirring blades 3 and 4 attached to the rotating shaft 2 is sucked up in the aerobic operation to suck up the sewage sent into the cylinder 5 5 The upper stirring blade 3 disposed so as to be in the lower position of the inner water surface, and for feeding a sewage into the cylindrical body 5 during an aerobic operation and for stirring by generating a water flow in the sewage during an anaerobic operation It is located in the water below the lower end of the cylinder 5 and is divided into the lower agitating blade 4 that is arranged so as to be always in water so that the sewage can be scattered around. The inverted conical member 6 is disposed above the upper stirring blade 3 and formed.
[0015]
In this case, the stirring blades 3 and 4 may have the same structure or different structures as long as they can generate a water flow, and the structure is not limited to the illustrated one.
Then, by dividing the stirring blades 3 and 4 into the upper stirring blade 3 and the lower stirring blade 4, it becomes easy to make the two different structures.
[0016]
Next, the operation of the aerator 1 will be described.
First, at the start of an aerobic operation, as shown in FIG. 1, the lower stirring blade located in the water below the lower end of the cylindrical body 5 by rotating the rotating shaft 2 driven to rotate by the electric motor 7 in one direction. 4, an upward water flow 10 is generated in the central portion of the sewage treatment tank A in the sewage water in the sewage treatment tank A, and the sewage is fed into the cylindrical body 5 by the upward water flow 10. As a result, the upper agitation blade 3, which has been arranged so that at least a part of the lower part thereof is positioned below the water surface in the cylinder 5, is sent into the cylinder 5 so as to rise in the cylinder 5. Then, it collides with the inverted conical member 6 and scatters sewage like a fountain from the gap with the upper end of the cylindrical body 5.
[0017]
When the sewage scattered around the sewage falls onto the sewage water surface, air is sent into the sewage, and contact with the air by scattering of water droplets of the sewage can be performed.
Thereafter, it is possible to perform aerobic operation by aeration by continuously scattering sewage like the fountain around.
At the same time, the lower stirring blade 4 located in the water below the lower end of the cylindrical body 5 generates an upward water flow 10 at the center of the sewage treatment tank A, which circulates in the sewage treatment tank A. The entire sewage treatment tank A can be stirred by generating a water flow.
[0018]
When the rotation of the rotating shaft 2 is started, the upper stirring blade 3 disposed so that at least a part of the lower portion thereof is positioned below the water surface in the cylinder 5 is located in the water below the lower end of the cylinder 5. When the sewage is fed into the cylinder 5 by the upward water flow 10 generated by the lower stirring blade 4 and the interior of the cylinder 5 is filled with the sewage, the sewage sent into the cylinder 5 by the upper stirring blade 3 is Can suck up continuously.
[0019]
On the other hand, at the time of anaerobic operation, as shown in FIG. 2, by rotating the rotating shaft 2 driven to rotate by the electric motor 7 in the reverse direction, the lower stirring blade 4 located in the water below the lower end of the cylinder 5 In the central portion of the sewage treatment tank A, a downward water flow 11 is generated, which can generate a circulating water flow in the sewage treatment tank A and stir the entire sewage treatment tank A.
[0020]
During this anaerobic operation, the reaction force is exerted on the entire aeration machine which is suspended by the float 8 and anchored by the rope 9 in the downward water flow 11 generated by the reverse rotation of the aeration machine 1. As a result, the entire aerator is floated together with the float 8 from the position relative to the water surface during the aerobic operation, so that the upper stirring blade 3 is positioned completely above the water surface in the cylinder 5. In addition, it is possible to operate silently by preventing idling in the cylindrical body 5 and generating noise due to contact sound hitting the water surface, and it is possible not to adversely affect the anaerobic operation.
In addition, since the aerator 1 is anchored by the rope 9 irrespective of the rotation direction by the aerobic operation and the anaerobic operation of the aerator 1, the reaction force due to the rotation can be restrained, and the water level changes. Since the floating and sinking is permitted within the allowable range, the installation position of the aerator 1 with respect to the water surface can be kept constant following the fluctuation of the water level, so that stable aeration and anaerobic stirring of sewage can be performed.
[0021]
The aerator of the present invention has been described above based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations are appropriately changed without departing from the spirit of the present invention. It is something that can be done.
[0022]
【The invention's effect】
According to the aeration machine of the present invention, the aeration machine is supported so as to float on the water surface with a float, and the stirring blade is always immersed in the sewage with the upper stirring blade disposed in the cylinder. The upper stirring blade is divided into the lower stirring blade, and the upper stirring blade is arranged so that it is at a position above the water surface in the cylinder during anaerobic operation, so that at least a part of the lower portion is at the position below the water surface in the cylinder at the start of the aerobic operation. Because the upper agitating blade can be lifted by the reaction force caused by the rotation of the aerator during anaerobic agitation, the upper agitating blade and the water surface do not come into contact with each other. It is possible to operate, follow the fluctuation of the water level, and keep the installation position of the aerator on the water surface constant, so the complicated lifting mechanism can be omitted, the structure of the aerator is simplified and maintained Easy, it is possible to obtain a highly reliable aeration machine.
[0023]
In addition, even if a rotational reaction force is generated by the operation of the aerator, the rotational reaction force can be constrained by the rope, and it can float and sink against fluctuations in the water level. Stable sewage aeration and anaerobic stirring can be performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which an aerobic operation is performed according to an embodiment of the aerator of the present invention.
FIG. 2 is a cross-sectional view showing a state in which the anaerobic operation is performed.
FIG. 3 is an enlarged view of an aerator.
[Explanation of symbols]
A Wastewater treatment tank 1 Aeration machine 2 Rotating shaft 3 Upper stirring blade 4 Lower stirring blade 5 Cylindrical body 6 Reverse cone member 7 Electric motor 8 Float 9 Wire (wire)
10 Upward water flow 11 Downward water flow

Claims (2)

An aerator having a stirring blade attached to a rotating shaft driven by an electric motor and a cylindrical body arranged so as to cover the periphery of the rotating shaft from below the water surface to above the water surface. While supporting to float, the stirring blade is divided into an upper stirring blade disposed in the cylinder and a lower stirring blade that is always immersed in the sewage, and the upper stirring blade is operated anaerobically. An aerator having a structure in which at least a part of a lower portion thereof is disposed at a position below the water surface of the cylinder so that the water surface is sometimes positioned above the water surface of the cylinder. 2. The aerator according to claim 1, wherein the aerator is anchored by a rope so as to restrain a rotational reaction force due to operation.

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