JP4017339B2 - Underwater aeration equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underwater aeration apparatus that is used by being submerged in a treatment liquid of an aeration tank.
[0002]
[Prior art]
An underwater aeration apparatus equipped with an axial-flow impeller is employed as a method for mixing air or the like into the aeration tank when treating sewage or the like due to aerobic microorganisms in the aeration tank. FIG. 5 is a diagram showing a configuration example of this type of underwater aeration apparatus. In FIG. 5, reference numeral 1 denotes a suction casing having a suction port 1 a below, and a discharge casing 2 having a discharge port 2 a opened obliquely downward from the horizontal is disposed on the suction casing 1. The suction casing 1 and the discharge casing 2 constitute a casing of an underwater aeration apparatus having a suction port and a discharge port.
[0003]
An impeller 3 is rotatably arranged in the suction casing 1, and a rotating shaft 4 of the impeller 3 extends vertically upward and is connected to a rotating shaft 5 of a motor M (directly or indirectly through a speed reduction mechanism or the like). Connected). The discharge casing 2 is provided with a plurality of discharge ports 2a at predetermined intervals in the circumferential direction. Further, an air chamber casing 7 for forming an air chamber 6 is provided inside the discharge casing 2, and air is introduced into the air chamber 6 from a normal air introduction pipe (not shown). Yes. Reference numeral 8 denotes a hanging tool for hanging the underwater aeration apparatus.
[0004]
When the submerged aeration apparatus having the above-described configuration is placed in a processing liquid in an aeration tank (not shown) and the motor M is started, the motor M is started directly or indirectly via a speed reduction mechanism or the like. The impeller 3 is rotated via a rotating shaft 4 that is connected to the other. Accordingly, the processing liquid W is sucked and discharged from the suction port 1 a of the suction casing 1 and flows toward the discharge port 2 a of the casing 2.
[0005]
On the other hand, the air introduced into the air chamber 6 through the air introduction pipe is discharged from an air outlet 9 provided in the vicinity of the outer periphery of the impeller 3 on the downstream side of the impeller 3, and becomes a gas A in the casing 2. Discharged. Thereby, the processing liquid W mixed with the gas A is discharged from the discharge port 2a as the processing liquid W1.
[0006]
Aerobic microorganisms in the treatment liquid in the aeration layer are activated by the air separated from the treatment liquid. Therefore, as an underwater aeration apparatus having the above-described configuration, an aerobic microorganism can be more efficiently activated by mixing a gas having a high oxygen or ozone content (mixed with air) into the treatment liquid. However, when oxygen or ozone is aerated, the amount of air supply is about 1/10 compared to normal air aeration. Therefore, it is necessary to make the diameter of the air jet outlet about 1/10 as compared with normal air supply.
[0007]
Further, if the bubbles to be supplied are made smaller, the surface area of the bubbles increases even with the same supply amount, so that the gas dissolution rate in the processing liquid is increased and the aeration efficiency is increased. However, when the diameter of the air outlet is about 6 mm or less, when the treatment liquid is sewage, dust or the like may accumulate (attach) on the air outlet when the submerged aeration apparatus is stopped, and the air outlet may be clogged. However, there is a problem that a small air jet cannot be provided.
[0008]
Further, as shown in FIG. 6, a suction casing 1 having a suction port 1a on the upper side is arranged at the top, a discharge casing 2 having a discharge port 2a is arranged at the bottom of the suction casing 1, and the inside of the discharge casing 2 is arranged. Is provided with a reverse funnel (conical cylindrical) air chamber casing 10, an air chamber 11 is formed in the discharge casing 2, an air outlet 12 is provided in the vicinity of the discharge port 2 a, and the air in the air chamber 11 is The upper suction / lower discharge type underwater aeration apparatus configured to discharge toward the discharge port 2a has the same problem as the lower suction / upper discharge type underwater aeration apparatus shown in FIG.
[0009]
In the underwater aeration apparatus shown in FIG. 6, the air introduced into the air chamber 11 through the air introduction pipe 13 is ejected from the air ejection port 12 and is ejected as the gas A into the discharge casing 2.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described points, and even if the diameter of the ejection port is reduced to reduce the size of the gas bubbles to be supplied, dust or the like is deposited (attached) and clogs the ejection port. It is an object of the present invention to provide an underwater aeration apparatus suitable for aeration of a gas (mixed with air) having a high oxygen or ozone content.
[0011]
[Means for Solving the Problems]
The invention according to claim 1 for solving the above problems, a casing having a plurality of discharge ports and opens to the horizontal obliquely downward at a predetermined distance above has a suction port in a circumferential direction downwards, the An impeller disposed rotatably in the casing and an aeration means for diffusing gas into the processing liquid are provided. By rotating the impeller, the processing liquid sucked from the suction port is scattered by the aeration means. In the underwater aeration apparatus that is mixed with the gas that has been discharged and discharged from the outlet , the air diffuser is oxygen, ozone, or a mixture of oxygen and air, or a mixture of ozone and air, or a mixture of oxygen, ozone, and air A diffuser means for diffusing a gas composed of a gas, and provided with a diffuser plate in which a large number of gas jets are formed in a plate material made of a flexible material at the opening of a diffuser part which is closed on one side and opened on the other side. , by the gas inlet tube to the diverging care unit Diffuser plate bulges outward by introducing the gas having a force, the gas ejected from a number of gas ejection port diameter is increased, the gas outlet by stopping the introduction of the gas into the diffuser section diameter is smaller configuration, by air diffusion means diffuser plate disposed fixed below the suction port of the casing such that the downwardly to introduce gas into the lithium vapor portion by the gas inlet pipe, the The gas is discharged toward the upstream side of the liquid flow of the processing liquid sucked into the suction port.
[0012]
As described above, the air diffuser includes a diffuser plate in which a large number of gas jets are formed in a plate made of a flexible material at the opening of the air diffuser that is closed on one side and opened on the other side. diffuser plate by introducing the gas having a pressure by the gas introduction tube bulge outward, the gas ejected from large number of gas ejection port diameter is increased to stop the introduction of the gas into the air diffuser portion diameter of gas outlet by a smaller configuration, and arranged and fixed below the inlet of the casing air diffusion means such diffusers plate facing down, the gas spraying component Ri by the gas inlet pipe By introducing the gas, the gas is discharged toward the upstream side of the liquid flow of the processing liquid sucked into the suction port. Therefore, when the gas introduction is stopped, the diffuser plate is shrunk and the diameter of the jet port is reduced. Therefore, for example, even if the diameter of the nozzle is smaller (1/10 or less) than the diameter of the nozzle through which normal air is diffused when gas is ejected, the introduction of gas can be stopped even if it is small enough to supply oxygen or ozone. Since the diameter is sometimes even smaller, dust or the like is less likely to accumulate (attach). Further, even if dust or the like accumulates in a state where the aperture is small, the aperture becomes large when the gas is ejected, so that the accumulated dust or the like is easily removed. Further, by reducing the diameter, the bubbles to be ejected become fine, and the dissolution efficiency of the gas in water can be improved. In addition, since the air diffuser is disposed and fixed on the upstream side of the suction port of the casing so that the air diffuser plate faces downward, dust or the like hardly adheres to the air diffuser plate.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of an underwater aeration apparatus according to the present invention. The basic configuration of the aeration apparatus is the same as that of the underwater aeration apparatus shown in FIG. As shown in the drawing, an air diffuser 14 diffuses into the water a gas formed by mixing one or more of oxygen, ozone and air at the lower part of the inlet 1a of the inlet casing 1, that is, upstream of the impeller. -1 was provided.
[0018]
As shown in FIG. 2 (a), the air diffuser 14-1 is a thin plate made of a cylindrical body that is closed on one side and opened on the other side, and is made of a flexible plate such as a resin material in the opening. A diffuser plate 15 in which a large number of jets 15a are formed is provided, and a gas formed by mixing any one or more of oxygen, ozone and air flows into the closed portion 14-1 into the diffused portion 14-1. A gas inlet 16a is provided. A gas inflow port 16a is provided at a portion of the gas introduction pipe 16 provided below the suction casing 1 in the lower central portion of the suction casing 1 so that the air diffusion plate 15 is located downward. It is attached so as to communicate with the gas introduction pipe 16. As a result, the gas introduced into the gas introduction pipe 16 is jetted downward from the jet port 15 a of the diffuser plate 15, that is, toward the upstream side of the water flow sucked into the suction casing 1.
[0019]
During operation of the underwater aeration apparatus, a gas formed by mixing any one or two or more of oxygen, ozone, and air is introduced from the gas introduction pipe 16 into the aeration unit 14-1. The pressure in the air diffuser 14-1 rises due to the inflow of the gas, and accordingly, the air diffuser plate 15 swells toward the outside of the air diffuser 14-1, and a large number of jets provided in the air diffuser 15 are provided. The diameter of the outlet 15a is increased. The gas diffused from the jet port 15a is discharged as gas A, and the gas A becomes fine bubbles and is mixed into the processing liquid W. When the motor M is started, the impeller 3 is rotated via the rotating shaft 5 and the rotating shaft 4, whereby the processing liquid W <b> 1 mixed with the gas A is sucked from the suction port 1 a of the suction casing 1 and discharged. From the discharge port 2a.
[0020]
When the underwater aeration apparatus is stopped, the gas inflow from the gas introduction pipe 16 to the diffuser 14-1 disappears, so the pressure in the diffuser 14-1 decreases and the diffuser plate swelled outward during operation. 15 shrinks to its original size, and the diameter of the jet outlet 15a also returns to its original size.
[0021]
As described above, the diameter of the jet port 15a of the diffuser plate 15 increases during operation of the underwater aeration apparatus, and returns to the original size when stopped, so the diameter of the jet port 15a when stopped is reduced. Therefore, when installed in the sewage treatment water tank, dust or the like is unlikely to accumulate at the ejection port 15a, and the ejection port 15a is not clogged with dust or the like. In addition, even when dust or the like accumulates in a state where the diameter of the ejection port 15a is small at the time of stoppage, gas flows in and increases in diameter during operation, so that the accumulated dust or the like is easily removed and an appropriate air diffused. Can be done.
[0022]
Moreover, since gas is discharged toward the upstream side of the water flow sucked in by the impeller 3 from the diffuser plate 15 of the diffuser 14-1, the dissolution efficiency of the refined gas in the processing liquid is improved. be able to.
[0023]
Note that the configuration of the air diffuser is not limited to that shown in the above embodiment, and may be configured, for example, as shown in FIGS. The diffuser 14-2 in FIG. 2B is formed of a cylindrical body that is closed on one side and opened on the other side, and a large number of jets 15a are formed in a plate made of a flexible material such as a resin material in the opening. A diffuser plate 15 is provided. Further, a gas inlet 16a into which a gas formed by mixing any one or more of oxygen, ozone, and air flows is provided on the side surface of the cylindrical body. The air diffuser 14-2 is attached to a portion located in the lower center of the suction casing 1 so that the gas introduction pipe 16 and the gas inlet 16a communicate with each other and the air diffuser plate is located below. Even if comprised in this way, the same effect as the case where the aeration part 14-1 of Fig.2 (a) is attached is acquired.
[0024]
Further, the air diffuser 14-3 in FIG. 2C is a thin cylindrical body having one side closed and the other side opened in a ring shape along the outer periphery of the air diffuser 14-3. A diffuser plate 15 in which a large number of ejection holes 15a are formed in a ring-shaped plate material made of a flexible material is provided. Moreover, the gas inlet 16a into which the gas which mixes any one or two or more of oxygen, ozone, and air flows in the obstruction | occlusion part 14-3 is provided in the obstruction | occlusion part. The air diffuser 14-3 is attached to a portion located at the lower center of the suction casing 1 so that the gas introduction pipe 16 and the gas inflow port 16a communicate with each other and the air diffuser plate 15 faces downward. Even if comprised in this way, the same effect as the case where the aeration part 14-1 of Fig.2 (a) is attached is acquired. That is, any configuration may be used as long as gas is diffused by a diffuser that forms a large number of jet holes on a plate made of a flexible material.
[0025]
FIG. 3 is a diagram showing a configuration example of the underwater aeration apparatus according to the present invention. The basic configuration of this underwater aeration apparatus is the same as that of the underwater aeration apparatus shown in FIG. A diffuser plate 17 is provided on the downstream side of the impeller 3 in the vicinity of the outer periphery of the impeller 3 to form a large number of jet holes in a plate made of a flexible material. In addition, the point which provides the gas chamber casing 20 in order to form the gas chamber 19 in the inside of the discharge casing 2 is the same as the underwater aeration apparatus shown in FIG.
[0026]
During the operation of the aeration apparatus, when the motor M is activated, the impeller 3 rotates via the rotating shaft 5 and the rotating shaft 4, and the processing liquid W is sucked from the suction port 1 a of the suction casing 1. A gas formed by mixing any one or more of oxygen, ozone and air is introduced into the gas chamber 19 of the gas chamber casing 20 from a gas introduction pipe (not shown). The diffuser plate 17 provided in the gas chamber casing 20 swells outward (in the direction of the discharge casing 2) due to an increase in pressure in the gas chamber 19, and a number of jets provided in the diffuser plate 17. The diameter of 17a becomes large. The gas A is diffused as fine bubbles from the outlet 17a having a larger diameter, mixed into the processing liquid W flowing in by the impeller 3, and discharged from the discharge port 2a of the discharge casing 2 as the processing liquid W1. .
[0027]
As described above, by providing the diffuser plate 17 on the downstream side of the impeller 3, it is confirmed from the experimental results that the aeration efficiency is improved as compared with the case where the diffuser plate is provided on the upstream side of the impeller 3. It was.
[0028]
FIG. 4 is a diagram showing a configuration example of the underwater aeration apparatus according to the present invention. The basic configuration of this underwater aeration apparatus is the same as that of the underwater aeration apparatus shown in FIG. A diffuser plate 18 is provided on the downstream side of the impeller 3 in the vicinity of the outer periphery of the impeller 3 to form a large number of jet holes in a plate made of a flexible material.
[0029]
During the operation of the aeration apparatus, when the motor M is activated, the impeller 3 rotates via the rotating shaft 5 and the rotating shaft 4, and the processing liquid W is sucked from the suction port 1 a of the suction casing 1. A gas formed by mixing one or more of oxygen, ozone, and air is introduced from the gas introduction pipe 23 into the gas chamber 22 of the gas chamber casing 21 of the reverse funnel (conical cylinder shape). The diffuser plate 18 provided on the outer periphery of the gas chamber casing 21 swells outward (in the direction of the discharge casing 2) due to an increase in the pressure in the gas chamber 22, and a large number of jets provided on the diffuser plate 18. The diameter of the outlet 18a is increased. The gas A is diffused as fine bubbles from the jet outlet 18a having a large diameter, mixed into the processing liquid W flowing in by the impeller 3, and discharged from the discharge port 2a of the discharge casing 2 as the processing liquid W1. .
[0030]
As shown above, the diffuser plate 18 is provided on the downstream side of the impeller 3, and the gas introduced from the gas introduction pipe 23 is diffused as the gas A from the outlet 18 a of the diffuser plate 18. Compared with the case where a diffuser plate is provided on the upstream side of the impeller 3 as in the case of the underwater aeration apparatus, it was confirmed from the experimental results that the aeration efficiency is improved.
[0031]
【The invention's effect】
As described above, according to the invention described in each claim, the following excellent effects can be obtained.
[0032]
According to the first aspect of the present invention, an air diffuser plate in which a large number of gas outlets are formed in a plate material made of a flexible material is provided at the opening of the air diffuser having one side closed and the other side opened. By introducing the gas having pressure through the gas introduction pipe into the air part, the diffuser plate swells outward, and gas is ejected from a large number of gas outlets with increased diameters , and the introduction of gas into the air diffuser is stopped. to a configuration in which the diameter of the gas outlet is reduced by, disposed fixed below the inlet of the casing air diffusion means such diffusers plate facing down, gas spraying component Ri by the gas inlet pipe By introducing the gas, the gas is discharged toward the upstream side of the liquid flow of the processing liquid sucked into the suction port. Therefore, when the gas introduction is stopped, the diffuser plate is contracted and the diameter of the ejection port is reduced. Therefore, the diameter of the outlet is smaller than the diameter of the outlet that normally diffuses air when the gas is ejected, and the diameter is even smaller when the introduction of gas is stopped. It is difficult for dust to accumulate (attach). Further, even if dust or the like accumulates in a state where the aperture is small, the aperture becomes large when the gas is ejected, so that the accumulated dust or the like is easily removed. Further, by reducing the diameter, the bubbles to be ejected become fine, and the dissolution efficiency of the gas in water can be improved. Further, since the air diffusion means diffuser plate is arranged fixed on the upstream side of the suction port of the casing such that the facing downward, dust or the like hardly adhere to the diffuser plate.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of an underwater atmosphere apparatus according to the present invention.
FIG. 2 is a diagram showing a configuration example of an air diffuser of the underwater field device according to the present invention.
FIG. 3 is a diagram showing a configuration example of an underwater atmosphere apparatus according to the present invention.
FIG. 4 is a diagram showing a configuration example of an underwater atmosphere apparatus according to the present invention.
FIG. 5 is a diagram illustrating a configuration example of a conventional underwater aeration apparatus.
FIG. 6 is a diagram illustrating a configuration example of a conventional underwater aeration apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Suction casing 2 Discharge casing 3 Impeller 4 Rotating shaft 5 Rotating shaft 6 Air chamber 7 Air chamber casing 8 Suspension tool 9 Air outlet 10 Air chamber casing 11 Air chamber 12 Air outlet 13 Air inlet pipe 14-1 3 Air diffuser 15 Air diffuser plate 16 Gas inlet tube 17 Air diffuser plate 18 Air diffuser plate 19 Gas chamber 20 Gas chamber casing 21 Gas chamber casing 22 Gas chamber 23 Gas inlet tube

Claims (1)

A casing having a plurality of outlets having a suction port on the lower side and opening upward at a predetermined interval in the circumferential direction and obliquely downward from the horizontal; an impeller rotatably disposed in the casing; and a gas for treating liquid An air diffuser for diffusing inside is provided. By rotating the impeller, the processing liquid sucked from the suction port is mixed with the gas diffused by the air diffuser and discharged from the discharge port. In underwater aeration equipment,
The air diffuser is an air diffuser that diffuses oxygen, ozone, a mixed gas of oxygen and air, a mixed gas of ozone and air, or a gas composed of a mixed gas of oxygen, ozone, and air. A diffuser plate in which a large number of gas jets are formed in a plate material made of a flexible material is provided at the opening of the diffuser that is closed and opened on the other side, and the gas having pressure is supplied to the diffuser by a gas introduction pipe. the diffuser air plate bulges outward by introducing and ejecting the gas from the plurality of gas ejection port diameter is increased, the gas outlet by stopping the introduction of the gas into the spraying component The diameter is reduced ,
By air plate diffusing the said air diffuser means disposed fixed below the suction port of the casing such that the downward introducing the gas into the by Ri before SL in the gas introduction pipe diffuser section, the gas Is discharged toward the upstream side of the liquid flow of the processing liquid sucked into the suction port.

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