JP2001062484A - Vertical shaft-type aeration agitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical shaft-type aeration agitator as a surface aerator highly capable of supplying oxygen under low power. SOLUTION: The water in a treating tank is aerated and agitated by this aeration agitator. The agitator is composed of a vertical shaft 1 driven by a motor and rotated, plural impellers 2 fixed to the vertical shaft 1 orthogonally to the shaft 1 and a water-turbine rotor 3 attached to the tip 2a of the impeller 2 and driven by the reaction force generated when the impellers 2 are rotated by the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical aeration type stirring device having a turbine impeller, and more particularly, to a water surface aeration in an oxidation groove (oxidation ditch) used in a water treatment facility. It relates to a stirring device.

[0002]

2. Description of the Related Art Recently, an oxidation ditch, which is often used in a small treatment plant as a sewage treatment method, is one of wastewater treatment facilities utilizing microorganisms.
Drilling, or digging a concrete-covered groove in a ring,
Drainage is placed therein, and the surface of the water is agitated by rotating brushes installed at one or two places in the groove to supply oxygen to the wastewater and allow the wastewater to flow and circulate through the groove. When the wastewater is purified by the action of microorganisms in the ditch, it is led to a sedimentation basin or the brush is stopped, and this is a variant of the activated sludge method in which the supernatant water is discharged. As an example of an aeration and stirring device used for such an application, see Japanese Patent Application Laid-Open No.
There is an aeration stirrer described in 138189. The apparatus includes a plurality of rotating branches 101 which are attached to a rotating shaft 100 driven by a motor (not shown) as shown in FIG. 6 and which rotates in the vertical direction of the water surface. This is an aeration agitating device comprising a hollow box-shaped molded body 102 provided with an opening 102a through which water or air inside enters and exits and a plurality of holes 102b for releasing bubbles for aeration. This device discharges water absorbed in the water toward the surface of the water and absorbs air when it is located above the water, and releases air that has been absorbed above the water as bubbles when it is located in the water. While rotating in the water while stirring, the surrounding water is stirred.

[0003]

However, the problem of such aeration and agitation devices is that a large amount of water absorbed in the water is discharged toward the surface of the water to make contact between the water and the air. In order to increase the amount of oxygen in the air in the water, the number of the rotating branches 101 is increased or the length of the rotating branches 101 is increased. An increase in the length of the rotary branch 101 increases the power required for stirring, and there is a problem that it is difficult to balance the amount of oxygen supplied to water with the running cost.
On the other hand, in a vertical axis type aeration and stirring device as shown in FIG.
The blade 10 fixed to the vertical axis 103 and protruding one part above the water surface
A method is also adopted in which the number of rotations of the blades 104 is suppressed by increasing the number of blades 4 in particular, but the amount of oxygen supplied to water is controlled by the blades 104.
The rotation speed is directly proportional to the rotation speed of the blades, and the effect is not obtained unless the flow is in a turbulent state.
There was also a limit in reducing the number of rotations of No. 4. The present invention has been made to solve the above problems, and has as its object to provide a vertical axis type aeration and stirring apparatus which is a water surface aeration and stirring apparatus having low power and high oxygen supply capacity.

[0004]

Means for Solving the Problems A vertical axis type aeration and stirring apparatus according to the present invention has been made to solve the above problems.
The gist of the invention described in the above is that in the aeration and stirring device for performing aeration and stirring on the water in the treatment tank, a vertical axis driven by a motor and rotated, and the vertical direction perpendicular to the vertical axis. A plurality of stirring blades fixed to a shaft, and a water wheel rotating blade attached to the tip of the stirring blade and driven by a reaction force of water generated by rotating the stirring blade by the motor. It is characterized by having. By attaching a turbine wheel with a simple structure to the tip of the stirring blade, the synergistic effect of the stirring blade and the turbine blade allows for a lower power and more suitable water surface aeration as compared to the case without the turbine blade. A stirring effect can be obtained.

The gist of the invention described in claim 2 of the vertical axis type aeration and stirring apparatus according to the present invention is that the stirring blade is a bar or a plate-shaped member having an inclination angle with respect to the vertical axis. The vertical axis type aeration / stirring apparatus according to claim 1, wherein: By stirring the stirring blade so as to scoop up the water on the water surface with the inclination angle, the vicinity of the water surface is agitated and the contact area with the air can be increased, so that the aeration and stirring effect is improved.

The gist of the invention described in claim 3 of the vertical axis type aeration and stirring apparatus according to the present invention is that the blades of the turbine impeller have a box shape having an opening, and the opening is 3. The water turbine impeller is provided so as to be in the same direction as the rotation direction of the water turbine impeller, and the turbine impeller is rotatably supported around a spindle. It is a vertical axis | shaft type aeration stirring apparatus of description. Since the blades of the turbine rotor blades have a box shape having an opening, water can be scooped up by the blades, and the turbine rotor blades
While repeating the process of revolving while rotating by the reaction force of the water of the stirring blade rotating by the motor, scooping water with the blade, dispersing the scooped water, and drawing air into the water with the blade, water is repeated. The aeration and stirring effect of water is improved with low power because of the aeration and stirring.

The gist of the invention described in claim 4 of the vertical axis type aeration and stirring apparatus according to the present invention resides in that a plurality of the water turbine rotating blades are provided concentrically around the vertical axis on the stirring blade. The vertical axis type aeration / stirring apparatus according to any one of claims 1 to 3, characterized in that: The aeration and stirring effect can be further enhanced by providing a plurality of water turbine rotating blades concentrically about the vertical axis on the stirring blade as well as at the tip of the stirring blade.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a vertical axis type aeration / stirring apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is an overall perspective view showing a first embodiment of a vertical axis type aeration and stirring apparatus according to the present invention, and FIG. 2 (a) is a front view of a stirring blade of a vertical axis type aeration and stirring apparatus according to the present invention. 2 (b) is a plan view of a stirring blade of the vertical axis type aeration / stirring apparatus according to the present invention, FIG. 3 (a) is a view showing the function of a water turbine rotor of the present invention, and FIG. FIG. 4 is an overall perspective view showing a second embodiment of the longitudinal axis type aeration and stirring device according to the present invention.

As shown in FIG. 1, a first embodiment of the aeration / agitating apparatus according to the present invention comprises a vertical axis 1 rotated by a motor with a reduction gear (not shown) and a direction perpendicular to the vertical axis 1. Four stirring blades 2 fixed to the vertical axis 1,
The main part is composed of four turbine rotor blades 3 attached to the tip of the stirring blade 2 and driven by the reaction force of water generated by rotating the stirring blade 2 attached to the vertical axis 1 by the motor. It is configured.

The vertical axis 1 is connected to a motor with a speed reducer (not shown) via a coupling or the like, and is provided so as to be vertical to the water surface. The shape of the vertical axis 1 is cylindrical, but any shape such as a square or hexagon may be used as long as it is a rod.

The stirring blade 2 is a plate-shaped member having an inclination angle θ as shown in FIG. 1 with respect to the vertical axis 1, and extends in a horizontal direction near the water surface, which is a direction orthogonal to the vertical axis 1, Each of the four rotating blades is fixed via a boss at a position on the vertical axis 1 where the length of the circumference around the center 1 is equally divided by the number of the stirring blades 2. The position of the stirring blade 2 is held on the vertical axis 1 so that it can be changed according to the water level. Further, the stirring blade 2 may be a bar. The shape of the stirring blade 2 is an inclined blade turbine type in FIG. 1, but any shape such as a flat blade turbine type or a marine propeller type that can be provided in the horizontal direction near the water surface of the vertical axis 1 may be used. Although the number of the stirring blades 2 is four in FIG. 1, two to eight blades are preferable from the viewpoint of required stirring power, manufacturing cost, and the like.

FIG. 2A and FIG.
As shown in (b), a plurality of bucket-shaped containers 3a are provided at the tip end portion 2a of the stirring blade 2 and are rotatably supported radially so as to be symmetrical at a plurality of positions in the circumferential direction of the support shaft 3d. is there. The container 3a is arranged in such a way that the opening is located on the surface coming out of the water surface, as shown in FIG. Although the shape of the container 3a is a box shape having an opening as shown in FIG. 3B, the container 3a has a hollow body such as a rectangular parallelepiped, a sphere, a hemisphere and the like, and has an opening. Any shape can be used as long as it can be scooped.
The number of blades of the turbine wheel 3 is six in FIG.
From the viewpoint of the reaction force of water, which is the rotational power of the water turbine rotor 3, and the initial cost, 4 to 8 sheets, and the rotation speed is 30 to 150r.
pm is preferred. FIG. 3 is an enlarged plan view of the water turbine rotor 3.
(B). In this figure, the tip 2 of the stirring blade 2
When the turbine wheel 3 is screwed to the a with a bolt 3b, the female screw 3c screwed with the bolt 3b is screwed using a screw that is a reverse screw with respect to the rotation direction of the turbine wheel 3. By doing so, it is possible to prevent the water turbine rotor blades 3 from falling off due to the loosening of the bolts 3b. Note that the cylindrical portion of the bolt 3b is a support shaft 3d of the water turbine rotating blade 3.

Next, the operation of the vertical axis type aeration and stirring apparatus according to the present invention will be described with reference to FIGS. 1 and 3 (a). When a motor with a reducer (not shown) is started, the vertical axis 1 connected to the motor with a reducer by a coupling rotates,
Tilt angle θ mounted horizontally near the water surface on vertical axis 1
Is rotated clockwise. Stirring blade 2
Has an inclination angle θ, so that the contact area between water and air increases to scoop up the water near the water surface and stir the water surface,
The liquid-side mass transfer coefficient between water and air can be increased (the liquid-side film resistance can be reduced). Further, the turbine wheel 3 attached to the tip 2a of the stirring blade 2 receives a reaction force from the water, and the direction opposite to the rotation direction of the stirring blade 2 (counterclockwise).
The water is aerated and agitated while repeating the steps of scooping up water, dispersing the scooped up water, and drawing air into the water while revolving around the vertical axis 1.
At this time, the turbine impeller 3 scoops up the water by the container 3a to divide the bulk water, and further divides the divided water into the container 3a.
Since the contact area between water and air can be increased by dropping and dispersing as a liquid film or a liquid droplet on the water surface, the rate of absorption of oxygen in the air into water can be increased. In addition, by pushing the air in the emptied container 3a into the water, the bulk water comes into contact with the air that has become bubbles, and the interface area becomes large, so that the oxygen in the air to the water is reduced. The absorption rate is improved. In this way, the oxygen in the air can be suitably taken into the water by the synergistic aeration and stirring effect of the stirring blades 2 and the turbine rotor blades 3. Further, since the power of the water turbine rotor 3 is not required, energy saving of the aeration and stirring power can be achieved.

Next, a second embodiment of the vertical axis type aeration / stirring apparatus according to the present invention will be described with reference to FIG. The vertical axis type aeration / stirring apparatus includes a vertical axis 4 connected to a motor with a speed reducer (not shown) by a coupling, and four stirring blades 5 provided on the vertical axis 4 in a direction orthogonal to the vertical axis 4; The main part is composed of the turbine wheels 6, 7.

The vertical axis 4 is connected to a motor with a speed reducer (not shown) via a coupling or the like, and is provided so as to be vertical to the water surface. The shape of the vertical axis 4 is a column shape, but any cross-sectional shape such as a square or hexagon may be used as long as the shape is a rod.

The stirring blade 5 is a plate-shaped member having the same inclination angle θ (not shown) as that of FIG. 1 with respect to the vertical axis 4, and is arranged in a horizontal direction near the water surface, which is a direction orthogonal to the vertical axis 4. Each of the four stirring blades 5 is fixed via a boss to the position of the vertical axis 4 when the circumference around the vertical axis 4 is equally divided by the number of the stirring blades 5. The position of the stirring blade 5 is held on the vertical axis 4 so that it can be changed according to the water level. Further, the stirring blade 5 may be a bar. The shape of the stirring blade 5 is an inclined blade turbine type in FIG. 4, but any shape such as a flat blade turbine type or a marine propeller type that can be provided in the horizontal direction near the water surface of the vertical axis 4 may be used. Although the number of the stirring blades 5 is four in FIG. 4, two to eight blades are preferable from the viewpoint of required stirring power, manufacturing cost, and the like.

Eight turbine impellers 6 and 7 are provided concentrically on the stirring blade 5 about the longitudinal axis 4, and the number of the turbine impellers 3 of the first embodiment attached to the stirring blade 5 is further increased. This is a structure that can further improve the aeration and stirring effect. However, since the distance from the center of the vertical axis 4 to the turbine impeller 6 and the distance from the center of the vertical axis 4 to the turbine impeller 7 are different, the peripheral speeds at the mounting positions of the turbine impellers 6 and 7 are different. Therefore, the turbine rotor 6,7
Even if the number is increased twice, the aeration and stirring effect is not always doubled. The functions and effects of the second embodiment of the vertical axis type aeration and stirring apparatus according to the present invention are the same as those described in the first embodiment, and therefore will not be described here.

Next, an embodiment of the vertical axis type aeration and stirring apparatus according to the present invention will be described. (1) Number of agitation (A) Conventionally, the agitation conditions to obtain the required amount of oxygen uptake in air
Assuming that the number of stirring blades is 8 and the number of revolutions on the vertical axis is 50 rpm, the number of stirrings = 8 × 50 rpm = 400 times / minute (B) The present invention FIG. 2B shows the stirring blade diameter D ₁ = 1100 mm, Assuming that the diameter D _{2 of} the turbine impeller is 260 mm, the number of stirring blades is four, the number of blades of the turbine is six, and the number of revolutions of the vertical axis is 40 rpm, the number of times of stirring of the turbine impeller is 4 × 6 × 40 x (1100/2
60) = 4061 times / minute Therefore, the number of times of stirring is about 10 times the number of times of conventional stirring,
The aeration and stirring effect near the water surface is improved. As a result, the number of times of contact between water and air increases. (2) Stirring power Since the stirring power is proportional to the cube of the number of revolutions on the vertical axis, the stirring power is (40/50) ³ = 0.512 compared to the conventional one. It becomes 2. (3) When the size of the portion for storing and scooped water container amounts waterwheel rotor blades taking in air and 9.7 cm × 4.4 cm × 2.2 cm volume about 94cm ³ next to the water, the min 94cm ³ × 4061 times / min = 381734cm ³ become so about 382 liters - the air / per minute. The specific gravity of air is 1.161k at 20 ° C
g / m ³ . Therefore, 26.6 kg of air can be taken into water per hour.

It should be noted that the present invention is not limited to the above-described embodiments of the present invention, and can be implemented with appropriate modifications as needed within a range in which the objects and effects of the present invention are produced. For example, as an application other than the aeration and stirring device of the water treatment tank, the present invention can also be applied to various aeration and stirring devices used in fermentation tanks, culture tanks, hydrogenation reactions, and the like.

[0020]

According to the present invention having the above-described structure and operation, 1) a turbine wheel having a simple structure is attached to the tip of the stirring blade, so that a water turbine is produced by a synergistic effect of the stirring blade and the turbine wheel. Compared to a case where no rotor is provided, a more favorable aeration and stirring effect on the water surface can be obtained with lower power. 2) By stirring the stirring blade so as to scoop up the water on the water surface by tilting the blade so that the area near the water surface is stirred and the contact area with the air can be increased, so that the mass transfer coefficient on the liquid side can be increased, and the aeration and stirring effect can be achieved. Is improved. 3) Since the blade of the turbine impeller has a box shape having an opening, water can be scooped up by the impeller, and the turbine impeller rotates by the reaction force of the water of the stirring blade rotated by the motor. While revolving and scooping water with the blades, dispersing the scooped water, and pulling air into the water with the blades, the water is aerated and agitated. improves. 4) The aeration and stirring effect can be further enhanced by providing a plurality of water turbine rotating blades concentrically about the vertical axis on the stirring blade as well as the tip of the stirring blade.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a first embodiment of a vertical axis type aeration and stirring apparatus according to the present invention.

FIG. 2 (a) is a front view of a stirring blade of a vertical axis type aeration / stirring apparatus according to the present invention. (B) It is a top view of the stirring blade of the vertical axis | shaft type aeration stirring apparatus concerning this invention.

FIG. 3 (a) is a view showing a function of a water turbine rotor of the present invention. (B) It is a whole enlarged plan view of the water turbine rotor of this invention.

FIG. 4 is an overall perspective view showing a second embodiment of the vertical axis type aeration and stirring device according to the present invention.

FIG. 5 is an overall perspective view of a conventional vertical axis type aeration and stirring device.

FIG. 6 is a perspective view showing a main part of a conventional aeration and stirring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical axis 2 Stirrer blade 2a Tip 3 Turbine rotor blade 3a Container 3b Bolt 3c Female screw 3d Support shaft 4 Vertical axis 5 Stirrer blade 6,7 Turbine rotor blade D1 Diameter of stirrer blade D2 Diameter of turbine wheel

Continuation of the front page (72) Inventor Masamichi Shigihara 2-1 Okawacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F term (reference) 4D029 AA04 AA06 BB01 BB10

Claims (4)

[Claims] 1. An aeration and stirring device for performing aeration and stirring of water in a treatment tank, wherein a plurality of shafts are fixed to the ordinate in a direction perpendicular to the ordinate and driven by a motor. And a turbine wheel attached to the tip of the stirring blade and driven by a reaction force of water generated by rotating the stirring blade by the motor. Vertical axis type aeration and stirring device. 2. The vertical axis type aeration and stirring apparatus according to claim 1, wherein the stirring blade is a rod or a plate-like member having an inclination angle with respect to the vertical axis. 3. A blade of the turbine wheel having a box shape having an opening, wherein the opening is provided so as to be in the same direction as a rotation direction of the turbine wheel. 3. The vertical axis type aeration and stirring device according to claim 1, wherein the shaft is rotatably supported around a support shaft. 4. A vertical turbine according to claim 1, wherein a plurality of said turbine rotor blades are provided concentrically around said vertical axis on said stirring blade. Shaft type aeration stirrer.