JP2003236578A - Aeration agitator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aeration agitator which can simply switch an aerobic operation and an anaerobic operation by driving individually a blade for aeration and a blade for agitation configured to be driven by an individual motor with simple construction. <P>SOLUTION: In the aeration agitator which selectively agitates or aerates sewage by blades for aeration and for agitation attached to a rotary shaft rotationally driven by a motor, an agitation shaft 6 having the blade 7 for agitation attached to a lower end outer circumferential part and an aeration shaft 4 having the blade 8 for aeration attached to an outer circumference are concentrically arranged, and the agitation shaft 6 and the aeration shaft 6 are configured to be driven by the individual motors 3 and 10. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aeration device,
In particular, for aeration, aerobic operation (aeration operation) that supplies air (oxygen) into water and anaerobic operation (stirring operation) that does not supply air (oxygen) into water are driven by separate electric motors. The present invention relates to an aeration and agitation device which is selectively operated by a blade and a stirring blade.

[0002]

2. Description of the Related Art Conventionally, when performing sewage treatment by alternately switching between aerobic operation that supplies air into water and anaerobic operation that does not supply air into water, an aerator is installed near the water surface of a sewage treatment tank. Then, during aerobic operation, the rotating shaft driven by the electric motor is raised and rotated in one direction to suck up the dirty water and scatter the dirty water like a fountain to drop it into the water. Aeration (aeration) is carried out by sending in air, while at the time of anaerobic operation, the rotating shaft is lowered and rotated in the opposite direction to generate a water flow in the dirty water to perform stirring.

[0003]

By the way, in the above conventional aerator, when switching between aerobic operation and anaerobic operation, in addition to switching the rotation direction of the rotating shaft driven by the electric motor, During operation, it sucks up sewage and scatters it around like a fountain.On the other hand, during anaerobic operation, a stream of water is generated in the sewage. There was a problem that the structure of the aerator became complicated.

In view of the problems of the conventional aerator, the present invention has a simple structure by individually driving the aerating blade and the agitating blade which are configured to be driven by individual electric motors. Then, it aims at providing the aeration stirring apparatus which can switch aerobic driving and anaerobic driving easily.

[0005]

In order to achieve the above object, the aeration and agitation apparatus of the present invention selectively agitates sewage by agitation and aeration blades attached to a rotary shaft that is rotationally driven by an electric motor. In an aeration stirrer adapted to perform aeration, a stirring shaft having stirring blades attached to the outer periphery of the lower end and an aeration shaft having aeration blades attached to the outer periphery are arranged concentrically, and the stirring shaft and the aeration shaft are Is configured to be driven by an individual electric motor.

In this aeration device, the agitation shaft having the agitation blade attached to the outer periphery of the lower end and the aeration shaft having the aeration blade attached to the outer periphery are concentrically arranged, and the agitation shaft and the aeration shaft are separately provided. Since it is configured to be driven by the electric motor of the above, and the aerobic operation and the aeration operation can be surely switched by the selection of the electric motor to be driven, the conventional mechanism for raising and lowering the aeration stirring device is not required. The configuration can be simplified, which reduces the number of breakdowns and simplifies maintenance.

In this case, the aeration blade can be arranged at the water surface position and the stirring blade can be arranged at a predetermined depth position below the water surface.

Thus, the aeration blades are arranged at the water surface position, and the stirring blades are arranged at appropriate positions at predetermined depth positions below the water surface, so that aeration and stirring can be efficiently performed.

Further, the aeration shaft may be hollow so as to penetrate the agitation shaft, rotatably supported by a mount via a rotary bearing, and driven by an aeration motor.

As a result, the hollow aeration shaft that penetrates the stirring shaft is rotatably supported on the mount via the rotary bearing and is driven by the aeration motor, so that the cantilever type stirring shaft is used. Since it can be supported coaxially while preventing runout, there are few failures, and maintenance of the aeration blades and aeration shaft can be performed easily.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the aeration stirring apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the aeration stirring device of the present invention. The aeration stirring device B is installed in a wastewater treatment tank having a required shape, and FIG. 1 shows a state where aerobic operation is performed.

The sewage treatment tank (not shown) in which the aeration and agitation device B is installed is not particularly limited, but has a required capacity in the form of a rectangle which is generally used for treating sewage. In addition, the aeration stirring device B is installed on a canopy 1 or a frame which covers the upper part of the sewage treatment tank at a predetermined position of the sewage treatment tank, for example, the central portion thereof.
It is installed so as to be fixed to the sewage treatment tank so that the sewage in the entire sewage treatment tank can be uniformly aerated or stirred.

As shown in FIG. 1, the aeration and agitation device B is connected so as to be rotationally driven by the agitation electric motor 3 attached to a pedestal 2 installed above the sewage treatment tank. A sewage stirring portion formed by attaching stirring blades 7 to a lower end portion of a stirring shaft 6 having a length reaching a predetermined depth in water, and a pedestal 2 supported via a rotary bearing 5 and an outer peripheral portion thereof. The aeration shaft 4 to which the aeration blade 8 is attached is composed of an aeration unit formed so as to be rotationally driven by the aeration motor 10. The stirring shaft 6 is not particularly limited and may be hollow or solid, and the stirring blade 7 is also screw-shaped in the illustrated embodiment, but its shape is Generate a downward flow of water,
There is no particular limitation as long as it can stir the dirty water.

The aeration shaft 4 forming a part of the aeration unit is
It has a hollow shaft shape and allows the stirring shaft 6 to penetrate therethrough,
In addition, the upper end outer peripheral portion is bent horizontally in the radial direction to integrally form the support piece 41, and the lower surface of the support piece 41 is rotatable via a rotary bearing mounted on the canopy 1 or the mount, for example, a thrust bearing 5. An aerating blade 8 formed so as to support and aerate by agitating the waste water of the water surface portion at the water surface position to aerate the waste water by mixing air with the waste water is supported. Further, a gear 9 is attached to the outer periphery of the aeration shaft 4 above the water surface, and is attached to a drive shaft 11 driven by an aeration motor 10 attached to the mount 2 so as to be adjacent to the stirring motor 3. The gear 12 and the gear 9 are brought into mesh with each other, whereby the aeration motor 10 is driven,
The aeration shaft 4 to which the aeration blade 8 is attached is rotationally driven via the drive shaft 11 and the gears 12 and 9.

The total length of the hollow aeration shaft 4 is set shorter than the total length of the agitation shaft 6 so that the aeration blade 8 can be supported at the water surface position, while the agitation shaft 6 is the lower end of the aeration shaft 4. It projects downward and reaches a predetermined depth above the surface of the water, so that the agitation of sewage can be efficiently performed below the surface of the water.

Further, the stirring shaft 6 is rotatably passed through the hollow aeration shaft 4. In this case, in order to prevent the cantilever type stirring shaft 6 from swinging, a bearing ( (Not shown) may be provided.

Next, the operation of this embodiment will be described. During anaerobic operation in which air is not blown in and only agitation of waste water is performed, the aeration motor 10 is stopped and only the agitation motor 3 is driven. As a result, the agitating electric motor 3 agitates the waste water by the agitating blades 7 rotating via the agitating shaft 6. In this case, since the aeration electric motor 10 is stopped,
The aeration blade 8 at the water surface position is also stopped, the air is not mixed with the dirty water, and the aeration is not performed.

On the other hand, in order to perform aeration (aerobic) operation for dissolving air in wastewater, the stirring motor 3 and the aeration motor 1 are used.
Both 0 are driven together. As a result, as in the case of the anaerobic operation, the stirring blade 7 is rotated by the stirring motor 3 to stir the sewage under a predetermined water surface, and the aeration motor 10 drives the drive shaft 11 and the gears 12 and 9 to intervene. The aeration blade 8 attached to the aeration shaft 4 is rotationally driven, whereby the wastewater at the water surface position is agitated. When the sewage at the water surface position is agitated, air is mixed in the sewage in the form of bubbles to dissolve oxygen in the air and perform the required aeration. When changing the strength of aeration and stirring, it can be adjusted by changing the number of rotations of the stirring motor 3 and the aeration motor 10.

The aeration stirrer of the present invention has been described above based on the embodiments. However, the present invention is not limited to the structures described in the above embodiments, and the structures thereof can be appropriately changed without departing from the spirit thereof. Can be changed.

[0021]

According to the aeration stirrer of the present invention, the stirring shaft having the stirring blades attached to the outer periphery of the lower end and the aeration shaft having the aeration blades attached to the outer periphery are arranged concentrically, and the stirring is performed. The shaft and aeration shaft are configured to be driven by separate electric motors, and it is possible to reliably switch between aerobic operation and aeration operation by selecting the electric motor to be driven. A mechanism for raising and lowering the device is not required, and the configuration can be simplified, which reduces failures and
Maintenance is also simple.

By disposing the aeration blades at the water surface position and the stirring blades at a predetermined depth position below the water surface, the aeration blades are placed at the water surface position and the stirring blades at a predetermined depth position below the water surface. Since they are arranged at appropriate positions, aeration and stirring can be performed efficiently.

Further, the aeration shaft is hollow so as to pass through the stirring shaft, is rotatably supported by a mount through a rotary bearing, and is driven by an aeration motor, so that the aeration shaft is hollow. -Like aeration shaft is rotatably supported on the pedestal via a rotary bearing, and is driven by an aeration electric motor.Therefore, a cantilever type agitation shaft can be supported coaxially while preventing runout. As a result, there are few failures, and maintenance of the aeration blade and aeration shaft can be performed easily.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an aeration stirring device of the present invention.

[Explanation of symbols]

B aeration stirrer 1 canopy 2 mounts 3 Electric motor for stirring 4 Aeration axis 5 rotary bearing 6 stirring shaft 7 Stirring blade 8 Aeration blades 9 gears 10 Electric motor for aeration 11 drive shaft 12 gears

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keisuke Hirose             Hitachi, 3-4-1, Shimosaka, Amagasaki-shi, Hyogo             Kiden Kogyo Co., Ltd. (72) Inventor Eiji Shimada             Hitachi, 3-4-1, Shimosaka, Amagasaki-shi, Hyogo             Kiden Kogyo Co., Ltd. (72) Inventor Hajime Iinuma             Hitachi, 3-4-1, Shimosaka, Amagasaki-shi, Hyogo             Kiden Kogyo Co., Ltd. F-term (reference) 4D029 AA05 AA06 BB10                 4G035 AB24                 4G078 AA13 AB20 BA05 BA07 BA09                       CA19 DA09 DA28 DA30

Claims (3)

[Claims] 1. An aeration agitator in which sewage is selectively agitated or aerated by blades for agitation and aeration attached to a rotary shaft that is driven to rotate by an electric motor. Aeration stirring characterized in that the agitation shaft and the aeration shaft having aeration blades attached to the outer periphery are concentrically arranged, and the agitation shaft and the aeration shaft are driven by separate electric motors. apparatus. 2. The aeration stirring device according to claim 1, wherein the aeration blade is arranged at a water surface position and the stirring blade is arranged at a predetermined depth position below the water surface. 3. The aeration shaft is hollow so as to pass through the agitation shaft, is rotatably supported on a mount via a rotary bearing, and is driven by an aeration electric motor. The aeration stirring device according to 2.