JPH11128978A - Agitation device and agitation of biologicaltreatment tank using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agitation device with excellent agitation performance and maintenance properties and low consumption of electric power. SOLUTION: An agitation device is provided with a body driving means in which an oroide-shaped body 8 suspended by two fork-shaped levers 5 by using neck shafts moving around two mutually crossed shaft lines is respectively connected on the end parts of two driving shafts 2 and 3 rotating in the reverse direction and being mutually parallel to the fork-shaped levers with a free joint 4 so as to drive the body 8 in such a way that rocking rotational movement is performed, based on the principle of a freely reversely turning link chain, and a supporting stand for supporting the body driving means so as to rock it are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring device and a method for stirring a biological treatment tank using the same.

[0002]

2. Description of the Related Art Water stored in an enclosed area (for example, pond water) often becomes polluted for the following reasons.

In daytime and nighttime, a temperature difference occurs between water near the surface and water near the bottom. In this case, natural convection does not occur since the water temperature is high near the surface and low near the bottom. Therefore, it is necessary to artificially agitate the closed area (for example, a pond) and move the oxygen-rich water near the surface to the bottom to aerate.

[0004] In the presence of algae that propagate in water, during the day, the algae absorbs solar energy, generates oxygen by carbon assimilation, and discharges it outside the body. Since the oxygen discharged from the algae easily adheres to the algae, the apparent specific gravity of the algae is reduced. Thus, during the day, algae are near the water surface. As a result, water near the surface of the pond is rich in oxygen, while water near the bottom of the pond is depleted of oxygen and often rots. After sunset, the algae absorb oxygen and emit carbon dioxide, as opposed to during the day. As a result, the amount of oxygen attached to the algae decreases, and the apparent specific gravity of the algae increases, so that the algae sink to about 20 to 50 cm below the water surface. However, at this point, oxygen cannot be supplied to the water near the bottom because the dissolved oxygen near the algae is consumed by the algae itself.

[0005] As described above, in a closed area such as a pond, it is difficult to supply oxygen to the vicinity of the bottom, and moreover, the consumption of oxygen near the bottom increases due to decay of organic substances and the like deposited on the bottom of the pond. As a result, toxic gas (eg, ammonia, hydrogen sulfide) is generated near the bottom due to anaerobic conditions, which often has a very bad effect on aquatic plants and animals. If the bottom sediment exceeds 1-2 m,
It is no exaggeration to say that the part below the middle class is dead.

In order to solve the above problems, a water supply means (for example, a stirring means) for generating a large water flow is installed in water (at least about 50 cm below the water surface), and the following (1) to (4) are improved. It is desired to do.

(1) Before sunset, the water temperature near the surface and the water temperature near the bottom are made uniform.

(2) Oxygen is supplied from the outside in order to improve the dissolved oxygen concentration in the lower layer during the daytime, and efforts are made to maintain the dissolved oxygen amount near the bottom at night.

(3) The supply of oxygen enhances the oxygen dissolving efficiency by placing as small bubbles as possible in the stirring water stream to extend the residence time of the bubbles in the water as much as possible. To this end, it is necessary to increase the installation depth of the air (oxygen) supply port, thereby increasing the time required for bubbles to float on the water surface and increasing the oxygen dissolving efficiency. Further, it is ideal to generate a water flow having a flow velocity higher than the bubble floating velocity in a wide range.

(4) The concentration of dissolved oxygen in the mud at the bottom is detected and used to improve the condition near the bottom. For example, a nutrient substance is supplied from the outside in order to promote the decomposition by aquatic organisms (for example, river clams), and then the dissolved oxygen concentration is detected and used for supplying the nutrient substance.

However, various stirrers have been proposed in order to achieve the above-mentioned improvements (1) to (4).
None of the conventional stirrers are practically satisfactory. The problem will be described below.

[0012] The conventional stirring device generates a flow by using a lift force caused by rotation of a blade attached to a tip portion of a drive shaft, or performs stirring by a discharge water flow from a water flow pump. In such a device, (i) dust dispersed in water wraps around the rotating shaft, and the stirring ability is significantly reduced. (Ii) Since the suction port of the discharge water flow generation pump is blocked by the dust,
(Iii) If the suction port of the pump is enlarged, foreign substances (eg, sand and dirt) will be sucked into the pump, causing problems such as failure or reduced performance. . In order to avoid such problems, a great deal of labor is required for maintenance and maintenance of the device. That is, the conventional stirrer has extremely poor maintainability. Further, since such a stirrer generates a shearing force at the time of stirring, the shearing force cuts a carrier (eg, a polyethylene glycol carrier, a cellulose carrier) used for stirring the biological treatment tank such as a pond. And may be damaged. In addition, such a stirring device consumes very large power, and is therefore not preferable from the viewpoint of environmental problems.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a stirring device which is excellent in stirring performance and maintainability and consumes low power. Is to provide. Further, the present invention provides a stirring method using such a device (for example, a stirring method for a biological treatment tank).

[0014]

According to one aspect of the present invention, a cervical shaft that moves about two mutually displaced axes so as to perform an oscillating rotational movement based on the principle of a reversible link chain. Body having an oroid-shaped body suspended by two fork-shaped rods and having the fork-shaped rods connected by universal joints to ends of two mutually parallel driving shafts rotating in opposite directions, respectively. There is provided a stirrer provided with a driving means and a support base for swingably supporting the body driving means.

In a preferred embodiment, a power source of the drive shaft is an air motor, and the support is rotated by exhausting the air motor.

In a preferred embodiment, the body driving means and the support stand are attached by a plurality of ball-supported shafts.

In a preferred embodiment, the body driving means and the support stand are attached by a plurality of springs having different elastic moduli.

According to another aspect of the present invention, two fork-like shapes are provided using a neck shaft that moves about two mutually intersecting axes so as to perform a swinging rotational movement based on the principle of a reversible link chain. A stirrer having a body driving means in which the fork-shaped rods are connected by universal joints to ends of two mutually parallel driving shafts rotating in opposite directions to drive a body having an oroid shape suspended by the rods. Is provided. A plurality of convex portions are provided at predetermined positions of the body having the oroid shape.

According to yet another aspect of the present invention, two fork shafts are used with a neck shaft moving about two mutually displaced axes so as to perform a swinging rotational movement based on the principle of a reversible link chain. Body driving means for connecting the fork-shaped rods to the ends of two mutually parallel driving shafts rotating in opposite directions by a universal joint in order to drive the body having an oroid shape suspended by the rods; A water flow control plate attached to the body driving means for controlling a flow direction of a water flow generated by swinging rotation of the body is provided.

According to still another aspect of the present invention, there is provided a method for stirring a biological treatment tank. This method comprises a body having an oroid shape suspended by two fork-shaped rods using a neck shaft moving about two mutually distorted axes so as to perform a swinging rotary motion based on the principle of a reversible link chain. Placing a stirrer in the water comprising body drive means in which the fork-shaped rods are respectively connected by universal joints to the ends of two mutually parallel drive shafts rotating in opposite directions to drive A step of generating a water flow by oscillating and rotating the body of the stirring device based on the principle of a reversible link chain;
Is included.

In a preferred embodiment, the method comprises:
Before the water flow generating step, the method further includes a step of disposing the carrier on the water surface or in water.

In a preferred embodiment, the method comprises:
Used for sludge treatment of pond.

In a preferred embodiment, the method comprises:
The bubbled air is supplied into the water while maintaining the maximum driving speed of the body and generating a water flow due to the swinging rotation of the body.

Hereinafter, the operation of the present invention will be described.

According to the agitating device of the present invention, the immobile water layer adhering to the body and its surroundings due to the periodic vertical and horizontal movement of the position based on the oscillating rotational movement of the body having an oroid shape A lift current is generated that pushes away the water layer. More specifically, the shape of an eight-shape drawing of a straight line trajectory connecting the support points of two fork-shaped rods that support the body,
A main stream of water flow occurs between the support shafts in a direction perpendicular to the support shaft. By utilizing such a lift flow (water flow zone), stirring can be performed using a periodically generated dispersed water flow in a wide range of directions. As a result, mechanical damage to the carrier moving in the water tank due to the stirring can be significantly reduced. Further, a stirrer having very excellent stirring efficiency can be obtained.

The speed at which the water flow zone is pushed out is highest at the end of the fork-shaped rod than the supporting point. When this end portion forms a surface parallel to the support shaft, the most powerful lift for generating water flow is obtained. Since the center of the water flow is pushed in a spread having a horizontal width and a vertical width that move alternately left and right,
Unlike a flow with a small spread, which is pushed out from a pipe outlet of a water flow pump, the spread of the water flow increases as the distance from the flow source (ie, the stirring device) increases.

When a biological treatment tank containing a carrier is stirred, water moves first in the water flow created by such displacement of the displaced volume, and then the carrier present therein moves around the water. Therefore, the carrier does not directly touch the body. Further, when the stirrer is movably installed, the position of the body always changes. Therefore, the lift does not always approach the surface of the body since the lift in the different direction always occurs due to the movement of the body. As a result, even a carrier having low mechanical strength can be stirred without being damaged. For example, a very soft carrier or a carrier having fibrous projections can be stirred without being damaged.

According to one embodiment of the present invention, the body driving means is swingably mounted on the support. Preferably, the support is rotatable. With such a configuration, the rotation axis of the body can be changed three-dimensionally. As a result, the water flow can go in all directions, and there is no place where the water flow cannot reach. As a result, it is possible to agitate places that could not be agitated conventionally, such as a corner of a water tank and a corner of a pond.
The speed of the water flow can be changed by changing the rotation speed of the body.

Further, since the agitating device of the present invention uses an oroid-shaped body, it requires only about 1/5 to about 1/10 of the energy required for rotating the stirring blade.

In a preferred embodiment, an air motor is used as a power source for driving the body, so that the exhaust air used for driving the body is converted into fine bubbles from a diffuser installed in water and discharged. can do. Therefore, since the air motor also functions as an oxygen supply source into water, the energy consumption efficiency is significantly improved. Smaller bubbles are preferred, and high pressure compressed air is used to create smaller bubbles. For example, a single-phase 100 volt, 0.45 kw power source for an air motor is sufficient. For example, when using a stirrer to improve the water quality of a pond, a power supply for night lighting equipment around the pond is sufficient,
No special power source is required. Compared with the aeration efficiency, the power consumption is about 1/15 to about 1/20 of that of the conventional stirring device.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments.

FIG. 1 is a schematic view of a stirring device according to a preferred embodiment of the present invention, and FIG. 2 is a schematic plan view of a support 21 of the stirring device of FIG.

The stirrer according to the present invention includes a support 21 and swingable body driving means. The body driving means is a device mount 1 that is swingably attached to the support base 21.
And a stirring body 8, and shafts 2 and 3 for driving the body 8. The shafts 2 and 3 are rotatably supported on the apparatus gantry 1 at predetermined intervals so as to be rotatable in parallel with each other. A hawk-like rod 5 is pivotally attached to an end of the shaft 2 by a universal joint 6. Similarly,
A hawk-like rod 7 is pivotally attached to the end of the shaft 3 by a universal joint 4. The rotational positions of the fork-shaped rods 5 and 7 are shifted from each other by 90 °. A body 8 having an oloid shape is attached to the fork-shaped rods 5 and 7 by a rotating neck shaft 9. Body 8
Performs an oscillating rotation when the shafts 2 and 3 rotate in opposite directions. In this case, the body 8 rotates about mutually intersecting axes 10 and 11 corresponding to the straight lines connecting the rotating neck axis 9 to the respective forked rods 5 and 7.

The support 21 is provided floating on the water surface or in the water, or attached to a fixed base. Preferably, the support 21 is rotatably provided. The means for rotating the support 21 is not particularly limited, and any appropriate means may be used. For example, as shown in FIG. 2, the support 21 can be rotated by providing the rotation assisting means 23. The rotation assisting means 23 is, for example,
It may be an outlet for discharging compressed air from the air supply source 14 for the air motor. For example, the support base 21 can be rotated in a predetermined direction by switching the air discharge direction to the direction of 23a or 23b by any appropriate means. The swinging motion of the device base 1 and the support 21
The stirring performance is further remarkably improved by combining the above-mentioned rotary motion. Further, when the support base 21 and the discharge port 23 are arranged in the water, the aeration efficiency is significantly improved. The air discharged from the outlet 23 is
This is because it is effectively used for both rotation and aeration.

The apparatus gantry 1 is swingably attached to the support 21. Any appropriate means can be adopted as a means for attaching the device gantry and the support pedestal, as long as the device gantry can swing. For example, the apparatus gantry 1 and the support base 21 are attached by a plurality of ball-supported shafts 22. Alternatively, as shown in FIG. 3, the device gantry 1 and the support pedestal 21 are provided with a plurality of springs 30 having different elastic moduli.
Mounted via. By pivotally attaching the device mount 1 to the support 21, the rotation axis of the body 8 changes three-dimensionally, so that the generated water flow can go in all directions, and there is no place where the water flow cannot reach. . As a result, the stirring performance is remarkably improved as compared with the case where the body is attached to the fixed device base.

Preferably, both shafts rotate non-uniformly (eg, at alternately increasing and decreasing angular velocities) so that the body 8 performs a regular oscillating rotational movement.
More specifically, for example, when one shaft accelerates, another shaft is preferably decelerated at the same rate. This phenomenon is repeated twice for each rotation of the shaft.

In order to drive the shafts 2 and 3, a motor is preferably arranged on the shafts 2 and 3. The motor may be an electric motor (AC motor or DC motor) or an air motor, but is preferably an air motor. The shaft can be driven by supplying compressed air to the air motor from any suitable air supply (eg, baby compressor) 14 via any suitable air guide (eg, rubber hose) 15. The use of the air motor eliminates the risk of electric leakage when the stirring device is used in water. Furthermore, when an air motor is used, the aeration efficiency at the time of stirring can be significantly improved by discharging compressed air used as power for driving the shaft into water. In addition, even when a plurality of agitating devices are installed in water, it is only necessary to add an air guide tube, so that it is possible to extremely easily add an agitating device.

As described above, when one shaft is accelerated, the other shaft is decelerated, so that the sum of the rotational movements of both shafts is kept constant, so that the link chain whose body can be turned over. Based on this, it is possible to perform a swinging rotational movement. By reversing the rotation direction of both shafts, the direction of generation of the water flow is reversed. Changing the rotation direction does not change the ability to generate a water flow (liquid sending ability). The air supply source supplies compressed air having a predetermined pressure at a predetermined rotation speed. The compressed air is distributed to both air motors such that air motors respectively mounted on both shafts are supplied with increasing and decreasing pressure. The rotation speed of the shafts 2 and 3 can be adjusted by adjusting the amount (for example, pressure and volume) of the compressed air supplied to the air motor. Adjustment of the amount of compressed air is performed by any suitable means.

The case where a drive source (for example, a motor) is attached to each of the shafts 2 and 3 has been described. However, it is also possible to attach a drive source to only one of the shafts 2 and 3. In this case, when one of the shafts is driven, the other shaft is driven with a slight delay due to the torsion of the fork-shaped rod and / or a shift in the play of the mounting portion of each member. According to such a configuration, control of the drive mechanism is easy,
And the effect that the cost of an apparatus is reduced is acquired.

The body 8 has an oloid shape. An oroid-shaped body is described, for example, in Japanese Patent Publication No. 6-8662. As described above, when the shafts 2 and 3 rotate in the opposite directions, the body 8 performs the swinging rotational movement. More specifically, the body 8 generates a water flow by pushing out surrounding water while rotating in a figure-eight shape. That is, according to the swinging rotation of the oroid-shaped body, no shearing force is generated unlike the conventional stirring by the blade. As a result, even when a carrier (eg, a polyethylene glycol carrier or a cellulose carrier) is used for agitation of the biological treatment tank including agitation of the pond, such a carrier is not cut or damaged. In addition, no suspended matter such as garbage dispersed in water is involved. Furthermore, the energy for driving the aroid-shaped body for stirring is much smaller than the energy for rotating the blades of the conventional stirring device (when actually measured, it is about 1/5 to about 1/1).
0). This is because the Oloid has two centers of gravity, and the entire body can be rotated with minimum energy to move the centers of gravity. Therefore, a stirrer with significantly lower energy (low power consumption) can be obtained as compared with the conventional stirrer.

Preferably, the body 8 is provided with a predetermined convex portion 8a as shown in FIG. By providing the convex portion 8a on the body 8, the amount of water that can be pushed away increases, so that the stirring performance is further remarkably improved.

Preferably, the stirring device of the present invention includes a water flow control plate 25 for controlling the flow direction of the water flow generated by the swing rotation of the body. The water flow control plate 25 is attached to the device gantry 1 by any appropriate means.
The mounting location and shape of the water flow control plate 25 can be appropriately changed according to the direction of the target water flow. The water flow control plate 25 is
For example, as shown in FIGS. 5 and 6, the stirrer may be arranged so as to block the flow of water flow to the rear and both sides of the stirrer to generate a water flow forward. As shown in FIG. 8, a water flow that pushes a water flow pushed upward or downward may be arranged to generate a water flow that propels the water flow forward. By providing the water flow control plate 25, it is possible to efficiently generate a water flow in a desired direction according to the purpose.

The stirring device of the present invention is installed in water (preferably at the bottom) as required. When installed underwater, the body 8 may be installed so as to be located above the apparatus gantry 1 or may be installed so as to be located below. When installed on the underwater bottom, the body 8 is necessarily arranged on the upper part of the apparatus gantry 1. For example, as shown in FIG. 9, the fixed base 27 is fixedly arranged on the bottom in water, and the support base 21 is rotatably attached to the fixed base 27. In the illustrated example, a shaft 28 is attached to the support 21, and the shaft 28 is rotated by an air motor 29, whereby the support 21 rotates. The air supply source 14 of the air motor 29 is arranged on the ground. further,
By discharging the air of the air motor 29 from the outlet 23, the rotation of the support base 21 is assisted, and aeration in water is promoted.

Preferably, an air diffuser 24 is further provided. In this case, since air can be separately bubbled from the air diffuser 24 and supplied into the water, aeration in the water is further promoted. The amount of air discharged from the air diffuser 24 is preferably changed in accordance with the rotation speed of the body. For example, it is preferable to supply air from the exhaust pipe while maintaining the rotation speed of the body at the maximum. Thus, the air can be supplied while maintaining the water flow generated by the swinging and rotating motion of the body, so that stirring with both excellent aeration effect and stirring performance is performed.

By installing the stirring device in the water, it is possible to improve the water quality without impairing the appearance of the water surface of the pond, for example. When the stirring device is installed in water (for example, in a pond), the water quality can be further improved by reversing the rotation direction of the body 8 between daytime and nighttime. For example,
In the daytime, the body 8 is rotated so as to push down the upper layer of water with a large amount of dissolved oxygen to the lower layer. On the other hand, at night, the rotation direction of the body 8 is reversed so that the lower layer water is pushed to the upper layer, and the temperature difference between the upper layer and the lower layer at night is made uniform.

In the present invention, the number of the apparatus gantry 1 and the body 8 attached to the support table 21 are not limited to one.
As shown in FIG. 9, a plurality of device mounts 1 and a body 8
Can be attached.

[0047]

【Example】

Example 1 A carrier was dispersed in a cylindrical container having a capacity of 200 liters at a dispersion concentration of 10 to 15% based on the volume of water used in the experiment. The container in which the carrier was dispersed was stirred for 72 hours using the stirring device of the present invention shown in FIG. When it was not possible to judge the damage of the carrier at this time, the mixture was further stirred for 15 days. The following (1) to (4) were used as carriers.

(1) Molded product obtained by molding a hydrophilic polymer gel into a sphere or cube, etc. Main component: polyethylene glycol Shape: mixture of a sphere having a diameter of 3 mmφ to 5 mmφ and a cube having a side of 4 to 5 mm Volume ratio to water ： 10% (2) Hydrophilic resin molded body which has been subjected to surface treatment so that sludge easily adheres Main component: polyethylene, polyurethane, cellulose Shape: 5mmφ hollow × 6mm cylindrical, hollow cylindrical, cylindrical, And a mixture of a porous cube and a volume ratio to water: 15% (3) A spherical molded body having fine voids entangled with elongated fibers Main component: polyester Shape: 3 mmφ to 5 mmφ spherical product Volume ratio to water: 15% (4) Molded product having fine voids entangled with elongated fibers Main component: Cellulose Shape: Mixture of cubes having sides of 4 to 5 mm Volume ratio to water: 15% The results are shown in Comparative Examples 1 and 2 described later. Results with, shown in Table 1 below. In Table 1, ◎ indicates that the carrier has not been cut or broken after stirring for 15 days, △ indicates that the carrier has been cut or broken after stirring for 15 days, and × indicates that the carrier has not been cut or damaged after stirring for 15 days. Indicates that the carrier is severely cut and broken after stirring.

[0049]

[Table 1]

(Comparative Example 1) Example 1 was the same as the conventional stirring apparatus using stirring blades except that a stirrer provided with a wire mesh for avoiding contact with the stirring blades and a guide plate for correcting the water flow was used. The water tank was stirred as in 1. Table 1 shows the results.

(Comparative Example 2) A stirrer having a cylinder whose upper portion opens like a trumpet and whose center is a common rotation axis, and a rotation shaft having a circular cylinder bent at a lower curve attached to its lower portion is rotated. The water tank was agitated in the same manner as in Example 1 except that the water in the cylinder was agitated by a water flow in the peripheral direction due to centrifugal force. Table 1 shows the results.

As is clear from Table 1, according to the stirring apparatus of the present invention, stirring can be performed without cutting or damaging the carrier. Furthermore, when visually confirming the stirring state, in Example 1, the water tank was sufficiently stirred to all corners, whereas in Comparative Example 1, there were many portions that were not stirred in the water tank, and a wire mesh for avoiding contact was observed. A large number of carriers were sucked into the eyes and did not move, carriers sucked into the blade side, and carriers deformed by colliding with the end of the guide plate. In Comparative Example 2, although the movement of the water flow was improved as compared with Comparative Example 1, it was found that there was a problem in the mechanical durability of the rotating shaft portion.

Further, when the rectangular water tank was agitated by the apparatus of Comparative Example 2, many portions remained without being agitated. It turned out that there were many omissions. On the contrary,
It was found that the use of the apparatus of Example 1 allowed sufficient agitation to all corners of the water tank regardless of the shape of the water tank.

When comparing the amount of power consumed by the power source of the stirrer, in the first embodiment, when the electric motor is used,
It was 0.010 to 0.015 kw. On the other hand, Comparative Examples 1 and 2 required 0.075 to 0.10 kw and 0.15 to 0.3 kw, respectively. Thus, when the electric motor was used, it was found that the power consumption of the stirring device of the present invention was 1/5 or less of the power consumption of the conventional stirring device.

In the case of using compressed air as a power source by using an air motor in the apparatus of the first embodiment, the power consumption was 0.16 kw, but the power consumption was 1.5 kg / cm without using a separate air supply source.
^At a pressure of ² -G, 80N-l / min of air could be supplied into the water. If a separate air supply source is used, the same or more electric power as an air motor is required, so in applications where aeration is performed in water, the device of the present invention is a very excellent energy-saving device. You can see that.
On the other hand, the devices of Comparative Examples 1 and 2 both required completely separate supply equipment to supply air.

These results were obtained in a small water tank having a capacity of 200 liters, and it was confirmed that the difference was further widened in a larger water tank. Therefore, by using the stirring apparatus of the present invention, excessive facilities are not required and the power cost for maintaining the operation is reduced, so that stirring of a large biological treatment tank (for example, a pond) is extremely low. Done at cost.

[0057]

As described above, according to the present invention, the driving means of the stirring body having an oloid shape is swingably attached to the support base. With such a configuration, the rotation axis of the body can be changed three-dimensionally. Therefore, the water flow can be directed in all directions, and a stirrer having excellent stirring performance can be obtained. Furthermore, the body having an oloid shape generates a water flow by pushing out surrounding water, so that floating substances in the water do not wrap or get entangled unlike the conventional stirring blade. Therefore, a stirrer excellent in maintainability can be obtained. In addition, the oroid shaped body can be driven with about 1/5 to about 1/10 energy compared to conventional stirring blades. Therefore, a very excellent energy-saving stirrer can be obtained.

Further, according to the present invention, there is provided a stirring method using such a stirring device (for example, a stirring method for a biological treatment tank).

The stirring apparatus and the stirring method of the present invention are suitably used for stirring in a biological treatment tank such as sludge treatment of a pond.

[Brief description of the drawings]

FIG. 1 is a schematic view of a stirring device according to a preferred embodiment of the present invention.

FIG. 2 is a schematic plan view of a support table of the stirring device of FIG.

FIG. 3 is a schematic view of a stirring device according to another embodiment of the present invention.

FIG. 4 is a schematic view for explaining a projection provided on a body of the stirring device of the present invention.

FIG. 5 is a schematic diagram for explaining a preferred embodiment of a water flow control plate used in the stirring device of the present invention.

FIG. 6 is a schematic diagram illustrating a preferred embodiment of a water flow control plate used in the stirring device of the present invention.

FIG. 7 is a schematic diagram for explaining another embodiment of the water flow control plate used in the stirring device of the present invention.

FIG. 8 is a schematic diagram for explaining another embodiment of the water flow control plate used in the stirring device of the present invention.

FIG. 9 is a schematic diagram for explaining a case where the stirring device of the present invention is installed at the bottom in water.

[Description of Signs] 1 Device base 2 Shaft 3 Shaft 4 Universal joint 5 Hawk-shaped rod 6 Universal joint 7 Hawk-shaped rod 8 Body 9 Rotating neck shaft 14 Air supply source 15 Air guide tube

Claims (10)

[Claims] 1. An oroid shape suspended by two fork-shaped rods using a neck shaft moving around two mutually displaced axes so as to perform a swinging rotational movement based on the principle of a reversible link chain. Body driving means for connecting the fork-shaped rods to the ends of two mutually parallel driving shafts rotating in opposite directions by a universal joint to drive the body, and swingably supporting the body driving means. A stirrer, comprising: 2. The stirrer according to claim 1, wherein a power source of the drive shaft is an air motor, and the exhaust of the air motor rotates the support base. 3. The stirrer according to claim 1, wherein said body driving means and said support table are attached by a plurality of ball-supported shafts. 4. The body driving means and the support base are attached by a plurality of springs having different elastic moduli.
The stirring device according to claim 1. 5. An oroid shape suspended by two fork-shaped rods using a neck shaft moving around two mutually displaced axes so as to perform an oscillating rotation based on the principle of a reversible link chain. Body driving means for connecting the fork-shaped rods to the ends of two mutually parallel driving shafts rotating in opposite directions by a universal joint for driving the body, wherein the predetermined shape of the body having the oroid shape is provided. A stirrer in which a plurality of protrusions are provided at positions. 6. An oroid shape suspended by two fork-like rods using a neck shaft moving around two mutually displaced axes so as to perform an oscillating rotational movement based on the principle of a reversible link chain. A body driving means connected to the ends of two mutually parallel driving shafts rotating in opposite directions to each other by universal joints to drive the body, and the body driving means attached to the body driving means. A stirring device, comprising: a water flow control plate for controlling a flow direction of a water flow generated by swinging rotation of the body. 7. An oroid shape suspended by two fork-shaped rods using a neck shaft moving around two mutually displaced axes so as to perform an oscillating rotation based on the principle of a reversible link chain. Disposing a stirrer in the water comprising body drive means in which the fork-shaped rods are respectively connected by universal joints to the ends of two mutually parallel drive shafts rotating in opposite directions to drive the body, A method of generating a water flow by swinging and rotating the body of the stirring device based on the principle of a reversible link chain. 8. The method according to claim 7, further comprising, before the step of generating a water flow, arranging a carrier on the surface or in water. 9. The method according to claim 7, which is used for sludge treatment of a pond. 10. The method according to claim 7, wherein the bubbled air is supplied into the water while maintaining the maximum driving speed of the body and generating a water flow by the oscillating rotation of the body.