JP2010167328A - Aeration agitator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aeration agitator where, even in a water tank of high water depth, energy consumption when air is fed to a liquid in a tank is suppressed, even in a tank bottom of high water depth, a sufficient water flow velocity is obtained, and, while preventing the precipitation of sludge material, the stirring of sewage can be efficiently performed. <P>SOLUTION: A rotary shaft 2 rotatively driven by a motor 1 is made hollow, further, at the lower position of the rotary shaft 2, a stirring blade 3 and an outer cylinder 4 provided so as to cover the circumference of the stirring blade 3, also capable of absorbing sewage from the upper part of the stirring blade 3 at the lower part and of discharging the same from the lower edge part are arranged. The lower edge of the rotary shaft 2 is elongated to the lower side of the stirring blade 3 at the lower part, and an opening air discharge port 2b is formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an aeration stirrer, and in particular, in a high water depth tank, while suppressing energy consumption when air is fed into the fluid in the tank, a sufficient water flow rate is obtained even at the high water depth tank to precipitate sludge substances. The present invention relates to an aeration stirrer that can efficiently stir sewage.

  Conventionally, sewage flowing into a sewage treatment plant is guided into a sewage treatment tank, and the sewage is agitated by an aerator disposed in the sewage treatment tank to perform an aerobic treatment. Although it does not specifically limit as this aerator, For example, as shown in patent document 1, the screw (stirring blade) arrange | positioned so that it may be immersed in sewage is rotationally driven with a motor, and sewage is mixed and stirred. However, a part of the sewage is sprinkled on the water surface for aeration.

  By the way, in the aeration machine as shown in Patent Document 1, after the sewage stirring water flow by the aeration machine has landed on the water surface, it is directed from the vicinity of the outer peripheral wall surface of the sewage treatment tank to the tank bottom, and then in the sewage treatment tank. It goes up to the surface of the water as an upward flow in the center. In other words, it is suitable for aeration and agitation in a sewage treatment tank in a small town with a relatively shallow bottom up to a water depth of about 6 m because it is a method of generating a flow from the surface layer downward to the bottom.

  However, in recent years, it has become difficult to secure a site for a sewage treatment plant in the vicinity of a city or a site for expansion of existing facilities, and improve the treatment efficiency even at a small site for a sewage treatment plant. Aiming for deep processing tanks, there is a demand.

  However, even if a high-output motor is used in the conventional aeration / stirring apparatus, due to its structure, only a water depth of less than 8 m from the water surface in the sewage treatment tank can be stirred, and a depth of 8 m or more and 12 m can be obtained. In a sewage treatment tank having a high water depth called a tank, there is a problem that a sufficient flow velocity at the bottom of the tank cannot be obtained and the tank cannot be applied.

Japanese Patent No. 3444865

  In view of the problems of the conventional aerator, the present invention suppresses energy consumption when air is fed into the liquid in the tank even in a high water depth tank, and obtains a sufficient water flow velocity even at the bottom of the high water depth tank. An object of the present invention is to provide an aeration stirrer capable of efficiently stirring sewage while preventing sedimentation of sludge substances.

  In order to achieve the above object, the aeration stirrer according to the first aspect of the present invention has a hollow rotating shaft that is rotationally driven by a motor, and covers one stirring blade at the lower position of the rotating shaft and the periphery of the stirring blade. And an outer cylinder that absorbs sewage from the upper part of the stirring blade and that can be discharged from the lower end part, and extends the lower end of the rotating shaft to the lower side of the stirring blade to form an open air discharge hole. It is characterized by being configured.

  In order to achieve the same object, the aeration stirrer of the second aspect of the present invention has a hollow rotating shaft driven by a motor and has different directions of the generated water flow at the upper and lower positions of the rotating shaft. Two rotating blades and an outer cylinder that covers the periphery of these stirring blades and that absorbs sewage water from the middle position of the upper and lower stirring blades and that can be discharged from the upper and lower end portions are disposed. The lower end of this is extended to the lower side of the lower stirring blade to form an open air discharge hole.

  In this case, the stirring blade can be accommodated in the lower end portion of the outer cylinder that covers the stirring blade, and the bubbles discharged from the air discharge holes provided in the lower end of the rotating shaft or the lower outer peripheral portion can be refined.

  In addition, the hollow rotary shaft can be provided with an air intake opening at a position above the water surface.

  In addition, it is possible to arrange an electromagnetic valve that selectively performs intake and stop of air into the rotary shaft.

  Further, it is possible to connect a blower that forcibly feeds air into the rotating shaft.

  According to the aeration stirrer of the first aspect of the present invention, the aeration stirrer of the present invention has a rotating shaft that is rotationally driven by a motor, and has one agitating blade at a lower position of the rotating shaft and the periphery of the agitating blade. And an outer cylinder that absorbs sewage from the upper part of the stirring blade and that can be discharged from the lower end, and extends the lower end of the rotating shaft to the lower side of the stirring blade, and opens an air discharge hole. By forming and configuring, the flow velocity of water becomes uniform in the radial direction on the inlet side of the blade, and even in a deep water tank, energy consumption when sending air into the liquid in the tank is suppressed, and high water depth Since a sufficient water flow rate can be obtained even at the bottom of the tank, it is possible to efficiently stir the sewage while preventing sedimentation of the sludge substance.

  Further, according to the aeration stirrer of the second aspect of the present invention, the two rotating blades that have a hollow rotating shaft driven by a motor and have different directions of the generated water flow at the upper and lower positions of the rotating shaft, An outer cylinder is arranged so as to cover the periphery of these stirring blades and absorb sewage from the middle position of the upper and lower stirring blades and discharge from the upper and lower ends, and the lower end of the rotating shaft is placed under the lower stirring By extending to the lower side of the blade and forming an open air discharge hole, the water flow is also blown upward on the rotating shaft, so that the bubbles blown out from the lower part for a longer time due to the effect of the upward water flow Since most of the oxygen in the blown air dissolves in the water because it stays, the amount of air sent in can be reduced, energy consumption can be reduced, and sufficient water flow speed can be obtained even at the bottom of a deep water tank While preventing the precipitation of sludge material because it can perform stirring of the sewage efficiently.

  In addition, the stirring blade is housed in the lower end portion of the outer cylinder that covers the stirring blade, and the bubbles discharged from the air discharge holes provided in the lower end of the rotating shaft or the lower outer peripheral portion are made finer. Bubbles discharged from the air discharge holes can be made finer due to the turbulent water flow around them, and the bubbles released into the water from the rotating shaft side surface are also made finer. Water mixed with bubbles can be blown out toward the bottom of the tank, and the dissolved rate of oxygen can be improved.

  Further, by providing the hollow rotary shaft with an air intake opening at a position above the water surface, air can be reliably and simply supplied to the sewage.

  In addition, by disposing an electromagnetic valve for selectively sucking air in and out of the rotating shaft, switching between aerobic operation and anaerobic operation is assured only by opening / closing the solenoid valve. Can do.

  In addition, by connecting a blower for forcibly sending air into the rotating shaft, it is possible to reliably switch between aerobic operation and anaerobic operation simply by switching the operation of the blower and stop, and more efficient Therefore, aerobic operation can be performed efficiently since air can be supplied.

It is a front longitudinal cross-sectional view which shows 1st Example of the aeration stirrer of this invention. It is a front longitudinal cross-sectional view which shows 2nd Example of the aeration stirrer of this invention. It is a front longitudinal cross-sectional view which shows 3rd Example of the aeration stirrer of this invention. It is a front longitudinal cross-sectional view which shows 4th Example of the aeration stirrer of this invention. It is a front longitudinal cross-sectional view which shows the Example of the structure which combined 2nd Example with 3rd Example of this invention. It is a front longitudinal cross-sectional view which shows the Example of a structure which combined 2nd Example with 4th Example of this invention.

  Hereinafter, embodiments of the aeration stirrer of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the aeration stirrer of the present invention.
The aeration stirrer A of the present invention is suspended at a predetermined position in a sewage treatment tank T installed in a sewage treatment plant or the like, and this is arranged so that the aeration stirrer A is self-supported in the tank or a stand It is possible to arbitrarily select whether to support and dispose.

In addition, as shown in FIG. 1, the aeration stirrer A is attached to a lower stirring blade 3 that induces a downward flow and a lower position of the rotary shaft 2 that is hollow so that air can flow, and an upper portion of the stirring blade 3 The rectifying mound 6 is attached to the rotary shaft 2, the rotary shaft 2 is supported by a shaft joint 1 C so as to be driven by a motor 1 disposed on the water surface, and between the rotary shaft 2 and the lower stirring blade 3. The outer cylinder 4 is arranged outside at a predetermined distance so as to cover the outer periphery.
The hollow rotary shaft 2 can be formed with an air intake port 2a that opens at a position above the water surface.

  Further, as shown in FIG. 1, the outer cylinder 4 is formed in a trumpet shape in which the upper end is widened, and a conical rectifying mound 6 is arranged at the center position of the outer cylinder 4. And the rectification | straightening board 61 protrudingly formed so that it may extend radially on the outer periphery of the rectification mound 6 may be located, and it may leave the upper end of the outer cylinder 4 and a required space | interval, and it may open an outer peripheral surface, and sewage It is set as the water inlet 41 which performs suction. The outer cylinder 4 has a straight lower discharge port 42 at its lower end side open square.

The stirring blade 3 attached to the lower end of the rotating shaft 2 is adapted to be accommodated in the lower end portion of the outer cylinder 4 disposed so as to cover the same, and bubbles discharged from the open air discharge holes 2b at the lower end of the rotating shaft are removed. The structure can be miniaturized.
In this case, the air discharge hole 2b is configured by extending the lower end of the rotating shaft 2 to the lower side of the lower stirring blade 3 and opening the lower end of the rotating shaft 2 extending downward from the stirring blade 3. It can also be configured by forming a plurality of small holes on the side surface (outer peripheral surface) of the part, or it can be configured to have both of them as shown in FIG.

Next, the operation of the aeration stirrer of the present invention will be described.
When the aeration stirrer A disposed in the sewage treatment tank T with the stirring blade 3 in the sewage submerged is rotated by the motor 1, the rotating shaft 2 is driven to rotate, the stirring blade 3 attached to the rotating shaft 2 has the outer cylinder 4. The sewage in the vicinity of the water surface is sucked into the outer cylinder 4 from the water inlet 41, and a downward flow is generated and discharged from the lower outlet 42 at the lower end of the outer cylinder 4 toward the bottom of the tank. At this time, since a negative pressure is generated in the water area around the stirring blade 3, the air in the rotating shaft 2 is discharged into the turbulent water flow by the negative pressure. At this time, since the structure of the stirring blade 3 subdivides the air cannon, the air cannon discharged into the turbulent water flow is further subdivided, and the oxygen solubility in the sewage is improved.
Further, the downward flow toward the bottom of the tank is always generated when the aeration stirrer A is driven, and when the aeration stirrer A is reached, the flow velocity in the tank is secured, so that sediment such as sludge is deposited. In addition, the sewage in the entire tank is aerated while being stirred.

Further, as shown in FIG. 2, the aeration stirrer A is hollow so that air can flow through two stirring blades, a lower stirring blade 3 that generates a downward flow and an upper stirring blade 5 that generates an upward flow. The motor 1 is mounted at two positions above and below the rotating shaft 2 and a rectifying mound 6a having an abacus bead shape at the midpoint between the two stirring blades 3 and 5, and the rotating shaft 2 is disposed on the water surface. The rotary shaft 2 and the lower stirring blade 3, the upper stirring blade 5, and the upper and lower stirring blades 3, 5 are supported in advance. The outer cylinder 4 is fitted over the outer periphery of the outer cylinder 4 at a predetermined distance, and a guide 7 is disposed at a position above the outer cylinder 4 and the upper stirring blade 5.
The hollow rotary shaft 2 can be formed with an air intake port 2a that opens at a position above the water surface.

  In addition, a predetermined distance is provided between two stirring blades attached to the upper and lower positions of one rotating shaft 2, that is, the lower stirring blade 3 and the upper stirring blade 5, and the rotation direction , The generated water flow is formed in different directions, that is, the lower stirring blade 3 and the upper stirring blade 5 are formed to have different twisting directions of the blade so that a downward water flow is generated and an upward water flow is generated. To do.

Further, as shown in FIG. 2, the outer cylinder 4 is configured such that the upper outer cylinder 4A and the lower outer cylinder 4B are vertically stacked. Both the upper outer cylinder 4A and the lower outer cylinder 4B are formed in a trumpet shape with one end widened so that the lower stirring blade 3 and the upper stirring blade 5 are accommodated therein, respectively. The spread sides are stacked vertically so as to face each other, and a rectifying mound 6a having a biconical shape (an abacus ball shape) is sandwiched therebetween. And it is set as the water inlet 41 which sucks in sewage so that the outer peripheral surface of the overlap part of this upper outer cylinder 4A and lower outer cylinder 4B may be opened.
In the water suction port 41 formed in the overlapping portion of the upper and lower outer cylinders 4A and 4B, a rectifying plate 61 is provided so as to project radially so as to extend radially on the outer periphery of the biconical rectifying mound 6a. As a result, the water inlet 41 is divided into upper and lower parts, and a guide 7 is provided below or above the water surface above the outer cylinder 4A at the upper part so as to face the upper end of the outer cylinder 4A with a predetermined interval. Arrange. Thereby, when the sewage discharged from the upper outlet 43 of the upper outer cylinder 4A is guided by the guide 7, the sewage serves to be guided in the radial direction around the aeration stirrer A.
Moreover, when the guide 7 is arrange | positioned on the water surface, when the dirty water discharged from the upper discharge port 43 is scattered by the guide 7, the scattered water is guide | induced to a radial direction similarly to the above.
The lower outer cylinder 4B has a lower lower opening 42 as a straight lower discharge port 42.

The lower stirring blade 3 attached to the lower end of the rotating shaft 2 is disposed within the lower end portion of the lower outer cylinder 4A disposed so as to cover it, and is discharged from the air discharge hole 2b opened at the lower end of the rotating shaft. The structure is such that the bubbles can be refined.
Further, the lower end of the rotating shaft 2 can be extended to the lower side of the lower stirring blade 3 and opened, or a plurality of holes can be formed on the lower side surface of the rotating shaft 2 to form the air discharge hole 2b.

Next, the operation of the aeration stirrer according to the second embodiment of the present invention will be described.
When the aeration stirrer A, in which the two agitating blades 3 and 5 are both submerged in the sewage in the sewage treatment tank T, is driven to rotate by the motor 1, the rotating shaft 2 is attached to the rotating shaft 2. The two upper and lower agitating blades 3 and 5 rotate in the upper outer cylinder 4A and the lower outer cylinder 4B, respectively, and suck the sewage near the water surface into the outer cylinder 4 from the water inlet 41, and the upper outer cylinder 4A. Inside, an upward flow is generated by the upper stirring blade 5 and discharged from an upper outlet 43 formed at the upper end of the upper outer cylinder 4A.
At this time, the sewage discharged from the upper discharge port 43 flows through the surface layer around the aeration stirrer A so as to be guided by the guide 7 attached to the rotary shaft 2, and the water flow acts like a lid. The rising bubbles are pressed into the sewage, and the residence time of the bubbles in the sewage is extended, so that oxygen in the bubbles is more effectively dissolved in the sewage.

On the other hand, in the lower outer cylinder 4B, a downward flow is generated by the rotation of the lower stirring blade 3 and discharged from the lower discharge port 42 at the lower end of the lower outer cylinder 4B toward the tank bottom. At this time, since a negative pressure is generated in the water area around the lower stirring blade 3, the air in the rotating shaft 2 is sucked into the sewage by the negative pressure, and is discharged into the sewage as bubbles. However, the structure of the lower stirring blade 3 is designed to make the bubbles finer, and since the bubbles are discharged into the turbulent water flow, the bubbles are made finer and the solubility of oxygen in the sewage is improved. It becomes.
Further, the downward flow toward the tank bottom is always generated when the aeration stirrer A is driven. When the aeration stirrer A is reached, the flow is changed to the inner peripheral wall side of the tank, and then rises along the inner wall surface of the tank. In this case, since the water flow velocity at the bottom of the tank is secured, the sediment deposition of solid matter such as sludge can be prevented in advance, and the entire sewage in the tank is aerated while being stirred.

  Moreover, when anaerobic stirring of sewage is performed, the air intake port 2a opened to the hollow rotating shaft is closed. As a result, the upper agitating blade 5 rotates in the upper outer cylinder 4A, and an upward flow is generated and discharged from the upper discharge port 43. The lower agitating blade 3 is also in the lower outer cylinder 4B. Rotates and sucks sewage near the water surface from the water inlet 41 into the lower outer cylinder 4B. As a result, a downward flow is generated in the lower outer cylinder 4B. Released. As in the case of the aeration operation, the downward flow toward the tank bottom changes its flow toward the inner wall of the tank and then rises along the inner wall of the tank. However, since the air intake 2a is closed in this downward flow, air is not sucked, and only the agitation is performed and the sewage in the entire tank is agitated without being aerated. .

FIG. 3 shows a third embodiment of the aeration stirrer of the present invention.
In the third embodiment, the main configuration of the aeration stirrer A is the same as that of the first embodiment, but the configuration can be changed to the configuration of the second embodiment shown in FIG.
In the third embodiment, the motor shaft 1S connected to the hollow rotating shaft 2 is also hollow, and is sent to the opposite output side end of the motor shaft 1S via a swivel (not shown) as necessary. A trachea 9 is connected, and a blower 8 is connected to the end of the air supply tube 9.
In this case, the rotary shaft 2 is not provided with the air intake port 2a.

Accordingly, when the aeration stirrer A is aerobically operated, the motor 1 of the aeration stirrer A is driven and the blower 8 is also driven. As a result, the blower 8 is forcibly supplied into the hollow motor shaft 1S through the air supply pipe 9, and air bubbles are discharged from the air discharge hole 2b at the lower end of the rotary shaft through the motor shaft 1S and the rotary shaft 2. . The discharged bubbles are refined by the rotation of the lower stirring blade 3 and are carried on the generated descending flow to the bottom of the tank. The oxygen in the fine bubbles is dissolved in the sewage, and the required aeration is performed.
When performing anaerobic operation, the blower 8 is stopped and only the aeration stirrer A is operated. By operating only the aeration stirrer A in this way, even if the upper stirring blade 5 and the lower stirring blade 3 rotate, the blower 8 is stopped, so air is not supplied into the rotating shaft. Only the sewage is anaerobically stirred.
As described above, the switching between the aerobic operation and the anaerobic operation of the aeration stirrer A can be easily selected and set depending on whether the blower 8 is operated or stopped.
In the third embodiment, since the operation of the aeration stirrer A is the same as that of the first embodiment except for the operation for stopping the operation of the blower 8 and the opening / closing operation of the solenoid valve 10, the detailed description thereof is omitted. .

FIG. 4 shows a fourth embodiment of the aeration stirrer of the present invention.
In the fourth embodiment, the main configuration of the aeration stirrer A is the same as that of the first embodiment, but the configuration can be changed to the configuration of the second embodiment shown in FIG.
In the fourth embodiment, the motor shaft 1S connected to the hollow rotating shaft 2 is also hollow, and a valve or an electromagnetic valve 10 is attached to the opposite end of the motor shaft 1S to open / close the valve. The aerobic operation or the anaerobic operation of the aeration stirrer A is selectively performed.
Switching between the aerobic operation or the anaerobic operation of the aeration stirrer A is performed by opening and closing the electromagnetic valve 10, and the aerobic operation is performed when the valve is opened, and the anaerobic operation is performed when the valve is closed.
In the third embodiment, since the operation of the aeration stirrer A is the same as that of the first embodiment except for the operation for stopping the operation of the blower 8 and the opening / closing operation of the solenoid valve 10, the detailed description thereof is omitted. .

  5 shows an embodiment in which the second embodiment is combined with the third embodiment of the present invention, and FIG. 6 shows a configuration in which the second embodiment is combined with the fourth embodiment of the present invention. Examples showing the above are respectively shown.

  As mentioned above, although the aeration stirrer of this invention was demonstrated based on several Example, this invention is not limited to the structure described in the said Example, The structure is suitably changed in the range which does not deviate from the meaning. Is something that can be done.

  The aeration stirrer of the present invention suppresses energy consumption when air is fed into the liquid in the tank, obtains a sufficient water flow rate even at the bottom of the tank at a high water depth, prevents sludge substance precipitation, and stirs sewage. Since it has the characteristic of being able to be efficiently performed, it can be used suitably for the use of a sewage treatment tank, and can also be used, for example, for the kneading of food.

A Aeration stirrer T Sewage treatment tank 1 Motor 2 Rotating shaft 2b Air discharge hole 3 Lower stirring blade 4 Outer cylinder 4A Upper outer cylinder 4B Lower outer cylinder 41 Suction port 42 Lower outlet 43 Upper outlet 5 Upper stirring blade 6 rectifying mound 6a rectifying mound 61 rectifying plate 7 guide 8 blower 9 air pipe 10 solenoid valve

Claims (6)

  The rotating shaft driven to rotate by the motor is hollow, one stirring blade is provided at a lower position of the rotating shaft, and the sewage is absorbed from the upper portion of the stirring blade so as to cover the periphery of the stirring blade. An aeration stirrer characterized in that an outer cylinder adapted to discharge more is disposed, the lower end of the rotating shaft is extended to the lower side of the stirring blade, and an open air discharge hole is formed.   The rotating shaft driven to rotate by the motor is hollow, and two stirring blades that have different directions of the generated water flow at the upper and lower positions of the rotating shaft, and the upper and lower portions so as to cover the periphery of these stirring blades An outer cylinder that absorbs sewage water from the middle position of the stirring blades and can be discharged from the upper and lower ends, extends the lower end of the rotating shaft to the lower side of the lower stirring blades, and has an open air discharge hole. An aeration stirrer characterized by being formed.   2. The structure according to claim 1, wherein the stirring blade is housed in a lower end portion of an outer cylinder that covers the stirring blade, and bubbles discharged from an air discharge hole provided at a lower end of the rotating shaft or a lower outer peripheral portion are refined. 2. The aeration stirrer according to 2.   The aeration stirrer according to claim 1, 2, or 3, wherein the hollow rotary shaft is provided with an air intake opening at a position above the water surface.   The aeration stirrer according to claim 1, 2, or 3, further comprising an electromagnetic valve configured to selectively suck and stop the suction of air into the rotating shaft.   The aeration stirrer according to claim 1, 2 or 3, wherein a blower for forcibly feeding air into the rotating shaft is connected.

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