JP6408185B1 - Underwater stirring aeration equipment - Google Patents

Abstract

An underwater agitating / aeration apparatus capable of uniformly and finely reducing the size of bubbles to be aerated. A submersible electric motor with a speed reducer, a propeller attached to a rotary shaft of the submersible electric motor with a speed reducer, a conical rotary cone having a hollow portion therein, and a surrounding of the propeller and the conical rotary cone. And a casing 3 that can store compressed air in the cavity, and a water flow path is formed by a gap between the inner peripheral surface of the casing 3 and the outer peripheral surface of the conical rotary cone 4. A stepped wall body 2 in which an insertion hole for the compressed air pipe 12 is formed at the center and a plurality of disk-shaped bodies having different diameters are stacked so that the peripheral edge has a stepped shape is provided at the bottom, and a conical shape is provided. A compressed air outlet is formed by a small gap in the vertical direction between the lower end of the rotating cone 4 and the surface of the uppermost disk-like body of the step-like wall 2, and the step-like portion of the step-like wall 2. Mixed pressure reduced pressure in the gap between the surface and the inner peripheral surface of the casing 3 To form an underwater agitation aeration device 1. [Selection] Figure 1

Description

  The present invention relates to an underwater agitating and aeration apparatus that is installed in a water tank such as a wastewater treatment facility and causes the inside of the water tank to be agitated and aerated.

  Patent Document 1 discloses a prime mover, a casing having both ends in the axial direction opened, and a casing that is rotatably accommodated in the casing and is rotationally driven by the prime mover from the axial one end opening of the casing to the other end. An impeller that generates a flow of water to the opening, an internal air supply passage that communicates an outlet provided in the blade of the impeller and an inlet opening in a hollow portion of the impeller boss, and a hollow portion of the impeller boss An underwater agitating and aeration device including an air supply pipe for supplying air to the water is disclosed.

JP 2004-275910 A

  Although the invention described in Patent Document 1 describes that fine air bubbles are generated by the diffused air colliding with the inner surface of the lower discharge casing, a flow path for compressed air is provided in the impeller. Therefore, since the impeller is thick and the rotational resistance of the impeller is increased, there is a problem that the rotational efficiency is lowered, the amount of electric power is increased, and the electric power charge is increased.

  That is, when the bubbles are small, for example, less than 1 mm in diameter, there is a problem that flocs and dust of the activated sludge in the water bind with the bubbles and float with the bubbles on the surface of the water tank, causing the water tank surface to become dirty and causing a problem. In general, air released into water has a surface area that is doubled if the bubble diameter is halved, and the oxygen dissolution rate is proportional to the surface area of the bubble. Assuming that the amount of air supplied is the same as when the diameter is 5 mm, the total surface area of all the generated bubbles is smaller than when the bubbles are 5 mm in diameter. By increasing the speed, there is a problem that the oxygen transfer efficiency by the whole bubbles is lowered and the energy efficiency is lowered. Therefore, there has been a problem that if the same oxygen transfer efficiency as in the case of bubbles having a diameter of 5 mm is to be secured, the power consumption increases.

  The present invention has been devised in view of these problems, and an object of the present invention is to provide an underwater agitating and aeration apparatus capable of uniformly and reducing the size of bubbles to be aerated. In the present invention, the small diameter means any size of 1 mm to 10 mm in diameter.

  The underwater agitating and aeration apparatus 1 according to claim 1 is an underwater agitating and aeration apparatus 1 for agitating and aerating underwater in a water tank 40, and a submersible electric motor with a speed reducer 10 having a rotary shaft provided in a vertical direction, and the speed reducer. A propeller 11 attached to the rotating shaft of the submersible electric motor 10 attached and disposed so as to suck in water from above and discharge it downward, and a lower end of the rotating shaft of the submersible electric motor 10 with speed reducer below the propeller 11 A conical rotary cone 4 having a hollow portion 15 attached to the inside, and a penetrating path in the vertical direction is arranged so as to surround the outer periphery of the propeller 11 and the conical rotary cone 4 in the left-right direction. Casing 3, a compressed air pipe 12 provided so as to provide a compressed air inlet 14 for allowing compressed air to flow into the cavity 15 of the conical rotary cone 4, and the submersible electric motor 10 with a speed reducer. A support column 13 to be fixed, the compressed air can be stored in the cavity 15, and a water flow path 50 is formed by a gap between the inner peripheral surface of the casing 3 and the outer peripheral surface of the conical rotary cone 4. A plurality of disk-like bodies 21 to 24 having different diameters are stacked so that a through hole for the compressed air pipe 12 is formed in the central portion below the conical rotary cone 4 and the peripheral portion is stepped. The stepped wall body 2 is provided, and compressed air is blown out by a small vertical gap between the lower end portion of the conical rotary cone 4 and the surface portion of the uppermost disk-like body 21 of the stepped wall body 2. A mouth 51 is formed, and a reduced pressure mixing channel 56 is formed by a gap between the stepped portion surface of the stepped wall body 2 and the inner peripheral surface of the casing 3.

  The underwater agitating and aeration apparatus 1 according to claim 2 is characterized in that, in claim 1, the plurality of disk-like bodies 21 to 24 constituting the stepped wall body 2 are rigid, and the disk-like body 24 in the lowermost layer is rigid. The disk-shaped bodies 21 to 23 of the other layers are respectively formed into a two-layer form of rigid bodies 21t, 22t, and 23t and lower bodies of elastic bodies 21g, 22g, and 23g. And

  The underwater agitating and aeration apparatus 1 according to claim 3 is the submerged stirring / aeration apparatus 1 according to claim 1, wherein the disk-like bodies 21 to 23 constituting the stepped wall body 2 are made of elastic bodies having different thicknesses and different elastic forces. It is characterized in that it can be detachably attached to the provided disk-shaped body.

  The underwater agitating and aeration apparatus 1 according to claim 4 is the submerged stirring / aeration apparatus 1 according to any one of claims 1 to 3, wherein the stepped wall body 2 is detachably fixed to a lower part of the support body 13 and is attached to an upper part of the support body 13. A fixing means 60 for fixing the submersible electric motor with speed reducer 10 is provided, and a height adjusting means for adjusting the height of the submersible electric motor with speed reducer 10 with respect to the column body 13 is provided in the fixing means 60, A fixing means 62 for fixing the casing 3 to the attachment member 42 of the submersible electric motor 10 is provided, and a height adjusting means for adjusting the height of the casing 3 relative to the submersible electric motor 10 with a speed reducer is provided to the fixing means 62. It is characterized by.

  The underwater agitating and aeration apparatus 1 according to claim 1 is an example of a stepped wall body 2 that forms a stepped peripheral wall by providing a stepped peripheral wall on a peripheral wall of a flow path through which a water stream containing bubbles flows. At the moment of changing from one disk-shaped body to the next disk-shaped body, pressure reduction due to pressure release occurs, and by generating several pressure reductions, the compressed air 31 ejected from the compressed air outlet 51 is deformed and destroyed. It has the remarkable effect that it can be made to become a bubble of further smaller diameter. Moreover, the remarkable effect that the bubble size was made uniform experimentally was obtained.

  Further, by changing the thickness of the stepped peripheral wall, the expected size of the bubble 75 can be obtained, and the diameter of the bubble 75 does not become less than about 1 mm, and the diameter of the bubble 75 exceeds about 10 mm. There is an effect that the bubbles 75 that cannot be ejected can be ejected into the water and can be made uniform into bubbles 75 having a size of about 6 mm, for example.

  Therefore, for example, in the activated sludge treatment, when the small-diameter bubbles 75 are ejected, the ejected bubbles 75 can be retained in the water for a long time, so that oxygen contained in the air can be efficiently dissolved in the water. Since the oxygen transfer efficiency can be improved, decomposition of organic substances by microorganisms in water can be promoted, and activated sludge mainly composed of aerobic microorganisms can be obtained.

  In addition, the oxygen contained in the air can be efficiently dissolved in water, that is, the oxygen transfer efficiency can be improved, so it is possible to reduce the amount of air supplied and supply the amount of oxygen that can be dissolved in water with less energy. As a result, energy efficiency can be increased and power consumption can be reduced.

  Moreover, it is possible to eliminate the dead space where the water stream 74 in which oxygen is dissolved does not reach the water tank 40 of the activated sludge tank, and it is possible to prevent anaerobic formation in the aerobic tank, and the collapse of the anaerobic layer in the activated sludge tank. Trouble can be prevented.

  In addition, the dead space where the water stream 75 in which oxygen is dissolved does not reach the activated sludge tank can be eliminated, complete stirring in the activated sludge tank becomes possible, and the growth of filamentous fungi and actinomycetes can be suppressed, and dissolved oxygen in the tank The contact efficiency with oxygen can be improved, and the treatment capacity of the entire waste water treatment facility can be improved. In addition, the ON / OFF operation of a compressed air supply device such as a compressor can easily create a state where there is no oxygen in the activated sludge tank, and since only the agitation can be operated, the denitrification efficiency is high, and in a short time Denitrification is possible.

  The underwater agitating and aeration apparatus 1 according to claim 2, when the compressed air supply device for supplying compressed air is stopped when, for example, intermittent operation is performed, the cavity in the conical rotary cone 4 from the compressed air outlet 51. The water in the tank flows backward to the part 15. At this time, there is a problem in that dust that has floated in the water that has flown back may bite into the compressed air outlet 51 and the motor of the submersible electric motor 10 with a reduction gear is stopped due to a load. The upper side of the disk-shaped bodies 21 to 23 is a slender-less plate that is a rigid body and a lower layer that is a rubber plate that is an elastic body, so that even if dust is caught, it is compressed again. When the air supply machine is operated, the rubber plate is depressed by the elastic force to reduce the force of pressing the dust, the force of flipping the dust by the rotation of the conical rotary cone 4 is applied, and the compressed air By adding the force to blow off the trash by the pressure of the trash, it has the effect that the trash that has been trapped is blown away. At this time, the hardness of the stainless steel plate has an effect of preventing the rubber plate from being damaged by foreign matter.

  The underwater agitating and aeration apparatus 1 according to claim 3 is provided with replacement means that enables the two-layered disk-shaped bodies 21 to 23 to be replaced with disk-shaped bodies having different thicknesses. By changing the thickness of the bodies 21 to 23, the size of the bubble 75 can be adjusted by adjusting the amount of pressure reduction caused by the pressure release.

  The underwater aeration / aeration apparatus 1 according to claim 4 is fixed to the column body 13 because the submersible electric motor 10 with a speed reducer is fixed to the column body 13 by providing a height-adjustable means in the vertical direction. Since the gap in the vertical direction between the upper surface of the stepped wall body 2 and the lower end portion of the conical rotary cone 4 attached to the rotating shaft of the submersible electric motor 10 with a speed reducer can be varied, the compressed air blowing The size of the bubbles can be adjusted by adjusting the blowing force of the air blown from the mouth 51.

  Further, since the casing 3 is fixed to the attachment member 42 of the submersible electric motor 1 with a speed reducer by providing a height-adjustable means in the vertical direction, the casing 3 and the conical rotary cone 4 are formed. Since the size of the cross-sectional area of the water flow path 50 can be changed and the cross-sectional area of the reduced pressure mixing flow path 56 can be changed by changing the gap between the casing 3 and the stepped wall body 2, The size of the bubble 75 to be ejected can be adjusted.

It is a front view which shows the outline | summary of the underwater stirring aeration apparatus of this invention. It is a top view which shows the outline | summary of the underwater stirring aeration apparatus of this invention. It is explanatory drawing of the fixing means which has a height adjustment means with respect to the support | pillar body of a casing or a conical rotary cone. It is explanatory drawing which shows the structure of a step-like wall body, a casing, and a conical rotary cone. It is explanatory drawing which shows the structure of a compressed air inflow port, a step-like wall body, and a conical rotary cone. It is explanatory drawing explaining a pressure reduction mixing flow path. It is explanatory drawing from the front view of a step-like wall body (part). It is explanatory drawing from the planar view of a step-like wall body. It is explanatory drawing which shows a bubble and a water flow when operating the underwater stirring aeration apparatus arrange | positioned in the tank.

  The underwater agitating and aeration apparatus 1 of the present invention is an apparatus that is installed in a water tank 40 such as a wastewater treatment facility into which wastewater flows and causes bubbles 75 to be agitated and aerated in the water tank 40 as shown in FIGS. By aeration and aeration of the bubbles 75, various aerobic microorganisms capture and proliferate organic matter in the wastewater, thereby creating activated sludge effective for wastewater treatment. As shown in FIG. 9, the underwater stirring and aeration apparatus 1 installed on the bottom surface 41 of the water tank generates a water flow 74 containing bubbles 75 in a wide range in the water tank 40.

  And in the water tank 40, such as a wastewater treatment facility, the underwater stirring and aeration apparatus 1 includes a water flow 30 generated from the upper side to the lower side by a rotating propeller 11, and a compressed air supply device such as a compressor (not shown). As a result, the compressed air 31 fed into the cavity 15 inside the conical rotary cone 4 is merged to generate bubbles.

  Further, when performing denitrification in the water tank 40, the compressed air supply machine such as a compressor may be stopped and only the agitation operation may be performed in the water tank 40, and the compressed air supply machine such as the compressor may be operated or stopped. Then, the underwater stirring aeration apparatus 1 is operated intermittently.

  The underwater agitating / aeration apparatus 1 according to the present invention is an underwater agitating / aeration apparatus 1 for agitating and agitating underwater in a water tank 40, and a submersible electric motor with a speed reducer 10 provided with a rotation shaft in the vertical direction, and the underwater electric motor with a speed reducer The propeller 11 is attached to the rotating shaft 10 and is arranged so as to suck in water from above and discharge it downward, and is attached to the lower end of the rotating shaft of the submersible electric motor 10 with the speed reducer below the propeller 11. A conical rotary cone 4 having a hollow portion 15 inside thereof, and a casing 3 which is disposed so as to surround the outer periphery of the propeller 11 and the conical rotary cone 4 in the left-right direction, and which forms a through passage in the vertical direction. And the compressed air pipe 12 provided so as to arrange the compressed air inlet 14 for allowing the compressed air to flow into the cavity 15 of the conical rotary cone 4 and the submersible electric motor 1 with a speed reducer are fixed. A support body 13, capable of storing compressed air in the hollow portion 15, forming a water flow path 50 in a gap between the inner peripheral surface of the casing 3 and the outer peripheral surface of the conical rotary cone 4, A staircase in which an insertion hole for the compressed air pipe 12 is formed in the central part below the conical rotary cone 4 and a plurality of disk-like bodies 21 to 24 having different diameters are stacked so that the peripheral part has a staircase shape. The compressed air outlet 51 is provided by a small vertical gap between the lower end of the conical rotary cone 4 and the surface of the uppermost disk-shaped body 21 of the stepped wall 2. And a reduced pressure mixing channel 56 is formed by a gap between the surface of the stepped portion of the stepped wall body 2 and the inner peripheral surface of the casing 3.

  The submersible electric motor 1 with a speed reducer is disposed at the center and in the upper part of the underwater agitating / aeration apparatus 1 as shown in FIGS. 1 and 2, and as shown in FIG. A fixing means 60 for fixing the submersible electric motor with speed reducer 10 is provided and fixed, and a height adjusting means for adjusting the height of the submersible electric motor with speed reducer 10 with respect to the column body 13 is also provided on the fixing means 60. Yes. For example, as shown in FIG. 3, the height adjusting means is configured to screw and fix the bolts in a double nut configuration that is fastened from both upper and lower surfaces of the attachment member 42 of the submersible electric motor 10 with the speed reducer, and There is a form in which a double nut is fastened from both the upper and lower surfaces of the upper mounting portion of the column body 13 and screwed and fixed, or the mounting member 42 of the submersible electric motor with speed reducer 10 and the upper portion of the column body 13 are mounted. There is a form (not shown) of fastening with bolts and nuts by changing the thickness of the spacer inserted between the parts.

  The rotating shaft of the submersible electric motor with speed reducer 10 has a plurality of propellers 11 disposed so as to suck in water from above and discharge downward, and a hollow portion 15 below the propeller 11. A conical rotary cone 4 is attached to each. Therefore, when the rotating shaft of the submersible electric motor with a speed reducer 10 rotates, the propeller 11 and the conical rotary cone 4 rotate.

  Moreover, when the height of the submersible electric motor 10 with a speed reducer is changed in the vertical direction with respect to the support column 13, the height of the propeller 11 and the conical rotary cone 4 is changed integrally.

  Next, as shown in FIGS. 1, 3, and 4, the propeller 11 rotates integrally with the rotation shaft of the submersible electric motor with speed reducer 10, and is, for example, any one of 3, 4, 6, and 8 The water flow 30 is generated from above to below by rotation. The water flow 30 flows down the water flow path 50. By changing the rotation speed of the submersible electric motor with speed reducer 10, the speed of the water flow 30 can be changed, and the size of the bubbles can be changed.

  Next, as shown in FIGS. 1, 3, and 4, the conical rotating cone 4 rotates integrally with the rotation of the rotating shaft of the submersible electric motor 10 with a speed reducer, and has a conical shape with a hollow portion 15 inside. Is forming. Compressed air flows into the hollow portion 15 through the compressed air pipe 12 by a compressed air supply machine such as a compressor, and is fed from the compressed air inlet 14. A compressed air outlet 51 is formed by a slight gap between the lower end of the conical rotary cone 4 and the surface of the uppermost disk-like body 21 of the stepped wall 2.

  The size of the small gap of the compressed air outlet 51 can be changed by a height adjusting means for adjusting the height of the submersible electric motor 10 with a speed reducer with respect to the column body 13. By changing the size of the gap, the speed of the compressed air 31 blown from the compressed air blowing port 51 can be changed, and the diameter of the bubbles blown into the water flow 30 generated by the rotation of the propeller 11 is changed. be able to.

  In addition, when denitrification is performed in the water tank 40, the compressed air supply machine such as a compressor is stopped, and when only the stirring operation is performed in the water tank 40, the water flows backward, and the compressed air outlet 51 is debris. Even if such a situation occurs, the conical rotary cone 4 rotates, so that the compressed air blowing formed with the surface portion of the uppermost disk-like body 21 of the stepped wall body 2 is performed. Garbage biting into the mouth 51 can be scattered.

  The casing 3 is arranged so as to be separated from the propeller 11 and the conical rotary cone 4 so as to surround the outer periphery in the left-right direction of the propeller 11 and the conical rotary cone 4. An opening is formed. A water flow path 50 is formed by a gap between the inner peripheral surface of the casing 3 and the outer peripheral surface of the conical rotary cone 4, and the stepped portion surface of the stepped wall body 2 and the inner peripheral surface of the casing 3 A reduced pressure mixing flow channel 56 is formed in the gap, and a bubble-containing water jet 55 is formed by the peripheral edge of the lowermost disk-like body 24 of the stepped wall and the peripheral edge of the casing 3.

  As shown in FIG. 3, the casing 3 is provided with fixing means 62 for fixing the casing 3 to an attachment member 42 of the submersible electric motor 10 with speed reducer, and the casing with respect to the submersible electric motor 10 with speed reducer is provided in the fixing means 62. Height adjusting means for adjusting the height of 3 is provided. For example, as shown in FIG. 3, the height adjusting means is configured to screw and fix the bolts in a double nut configuration that is fastened from both upper and lower surfaces of the attachment member 42 of the submersible electric motor 10 with the speed reducer, and There is a form that is screwed and fixed in a double nut configuration that is fastened from both the upper and lower surfaces of the member of the casing 3, or a spacer that is inserted between the attachment member 42 of the submersible electric motor with speed reducer 10 and the member of the casing 3. There is a form (not shown) of fastening with bolts and nuts by changing the thickness.

  As a result, the size of the cross-sectional area of the water flow path 50 formed by the casing 3 and the conical rotary cone 4 can be varied, and the gap between the casing 3 and the stepped wall body 2 can be changed to reduce the mixed pressure flow. Since the cross-sectional area of the channel 56 can be varied, the size of the bubble 75 ejected from the bubble-containing water ejection port 55 into the water tank 40 can be changed by changing the pressure in the reduced pressure mixing channel 56.

  As shown in FIGS. 1 and 3 to 5, the stepped wall body 2 is disposed below the conical rotary cone 4 with a slight gap from the lower end of the conical rotary cone 4. A plurality of disk-shaped bodies 21 to 24 having different diameters, each having an insertion hole for the compressed air 12 in the central portion, are laminated so that each peripheral portion has a stepped shape. A compressed air outlet 51 is formed by the lower end of the conical rotary cone 4 and the surface of the uppermost disk-like body 21 of the stepped wall 2. Further, the stepped wall body 2 is fixed to the lower portion of the column body 13 so as to be detachable. A reduced pressure mixing channel 56 is formed by the peripheral edge of the stepped wall body 2 and the inner peripheral surface of the casing 3.

  The step-like wall body 2 is formed by laminating disk-like bodies 21 to 24 as shown in FIGS. 7 and 8, and a plurality of the disk-like bodies 21 to 21 constituting the step-like wall body 2. 24, the disk-like body 24 in the lowermost layer is a single-layer form of a rigid body, and the disk-like bodies 21 to 23 of the other layers are respectively rigid bodies 21t, 22t, 23t on the upper side and elastic bodies on the lower side A two-layer configuration of 21 g, 22 g, and 23 g is adopted. As the rigid bodies 21t, 22t, and 23t, for example, a stainless steel plate that does not easily rust is suitable, and as the elastic bodies 21g, 22g, and 23g, for example, a rubber board is suitable. As a result, when the compressed air supply device such as a compressor is stopped and only the agitation operation is performed in the water tank 40, the elastic body 21g when the water flow reversely flows into the compressed air outlet 51 and the dust is caught. , 22g, and 23g are reduced in the height direction, and the bitten dust is easily removed, and the stepped wall body 2 is not damaged.

  Moreover, the said disk-shaped bodies 21-23 which comprise the said step-like wall body 2 can be attached or detached so that replacement | exchange is possible with the disk-shaped body provided with the elastic body which has different thickness and a different elastic force. By changing the thickness of any one or more of the disk-shaped bodies 21 to 23, a change in the indoor pressure from the air / water mixing chamber 52 to the first decompression chamber 53, or from the first decompression chamber 53 to the second decompression chamber. The size of the bubble can be changed depending on whether the change in the indoor pressure to 54 is negative, overpressure, or the same pressure.

  A compressed air outlet 51 is formed by the lower end portion of the conical rotary cone 4 and the surface portion of the uppermost disk-like body 21 of the stepped wall body 2, as shown in FIGS. 3 and 6. The size of the gap between the compressed air outlets 51 can be varied by the height adjusting means provided in the fixing means 60 of the submersible electric motor 10 with the speed reducer to adjust the flow rate of the compressed air 31 and adjust the size of the bubbles. can do.

And as shown in FIG.4 and FIG.6, the reduced-pressure mixing flow path 56 is formed by the peripheral part of the step-like wall body 2 and the inner peripheral surface of the casing 3, and the reduced-pressure mixing flow path 56 is The air / water mixing chamber 52, the first decompression chamber 53, and the second decompression chamber 54 are configured.

  As shown in FIG. 6, in the air / water mixing chamber 52, which is an area surrounded by the uppermost disk-shaped body 21, the second-layer disk-shaped body 22, and the inner peripheral surface of the casing 3, Since the cross-section of the decompression mixing channel 56 is abruptly enlarged from the peripheral edge of the upper disk-shaped body 21, the decompression by pressure release is generated in the pressure of the water flow, and the pressure is blown out from the compressed air outlet 51. The bubbles can be deformed and destroyed to make the bubbles smaller.

  Further, in the first decompression chamber 53, which is an area surrounded by the second-layer disc-like body 22, the third-layer disc-like body 23, and the inner peripheral surface of the casing 3, the second-layer disc From the air-water mixing chamber 52, the third layer disk-like body 23 side of the peripheral portion of the cylindrical body 22 is stepped and the cross section of the reduced pressure mixing channel 56 is suddenly enlarged to generate a reduced pressure by pressure release. The bubbles that have flowed can be deformed and destroyed to make bubbles of smaller diameter, and the size of the bubbles can be averaged.

  Further, in the second decompression chamber 54, which is an area surrounded by the third-layer disc-like body 23, the fourth-layer disc-like body 24, and the inner peripheral surface of the casing 3, the third-layer disc From the first decompression chamber 53, the fourth layer disk-like body 24 side of the peripheral portion of the body 23 is stepped and the cross section of the decompression mixing channel 56 is suddenly enlarged to generate decompression by pressure release. The bubbles that have flowed can be deformed and destroyed to make bubbles of smaller diameter, and the size of the bubbles can be averaged.

  Further, in the pressure release water reduction 57 which is an area outside the peripheral portion of the fourth layer disk-shaped body 24, the peripheral portion of the fourth layer disk-shaped body 24 is stepped from the inside of the reduced pressure mixing channel 56. It is possible to suddenly generate a reduced pressure by releasing the pressure to deform and destroy the bubbles flowing from the second reduced pressure chamber 54, thereby further reducing the diameter of the bubbles.

  The number of stacked disc-like bodies of the stepped wall body 2 is not limited to four as shown in FIG. 1, but a trial is carried out to realize the target bubble size. Determine. Further, in the experiment, it was possible to make the size of the bubbles 75 uniform and to make the size uniform.

  Further, when the underwater agitating and aeration apparatus 1 is intermittently operated and the compressed air supply machine such as a compressor is stopped, water containing dust in the water tank 40 is supplied from the compressed air outlet 51 to the conical shape. When flowing into the cavity 15 in the rotating cone 4, dust may be caught in the compressed air outlet 51. When the compressed air supply device such as a compressor is operated again, the dust caught by the compressed air is blown off. At this time, the elasticities of the elastic bodies 21g, 22g and 23g of the disk-like bodies 21 to 23 are elastic. The rubber plates 21g, 22g, and 23g are compressed by force, and dust can be easily blown away. At this time, dust is not entrapped in the disk-like body by the slender-less plates which are the rigid bodies 21t, 22t, and 23t on the upper side of the disk-like bodies 21g, 22g, and 23g, and can be easily slid and blown away. .

  As shown in FIG. 9, the underwater agitating and aeration apparatus 1 of the present invention is installed on the bottom 41 of the water tank at the center of the water tank 40 such as a wastewater treatment facility, and when the power is turned on, The compressed air supply machine (not shown) operates. The rotating shaft of the submersible electric motor with speed reducer 10 rotates, and the propeller 11 and the conical rotating cone 4 attached to the rotating shaft rotate. When the propeller 11 rotates, the water flow 30 flows down the water flow path 50. On the other hand, the compressed air 31 generated by the compressed air supply machine flows through the compressed air pipe 12 and is stored in the hollow portion 15 from the compressed air inlet 14, and the stored compressed air 31 is stored in the compressed air outlet. From 51, it blows toward the water stream 30. Each time the air mixing chamber 52, the first decompression chamber, and the second decompression chamber flow, the diameter of the bubbles is reduced by the step shape of the step-like wall body 2 constituting the inner peripheral surface of the flow path. And average. Then, a bubble-containing water flow is ejected from the entire circumference of the underwater agitating / aeration apparatus 1 from the bubble-containing water ejection port 55 into the water tank 40, and as shown in FIG. Can be made to flow without creating a dead space.

DESCRIPTION OF SYMBOLS 1 Underwater stirring aeration apparatus 2 Step-like wall body 3 Casing 4 Conical rotary cone 10 Submersible electric motor with a reduction gear 11 Propeller 12 Compressed air piping 13 Strut body 14 Compressed air inlet 15 Cavity 21 Disk-shaped body 21t Rigid body 21g Elasticity Body 22 Disc-shaped body 22t Rigid body 22g Elastic body 23 Disc-shaped body 23t Rigid body 23g Elastic body 24 Disc-shaped body 30 Water flow 31 Compressed air 40 Water tank 41 Bottom surface 42 Mounting member 50 Water flow path 51 Compressed air outlet 52 Air Water mixing chamber 53 First decompression chamber 54 Second decompression chamber 55 Bubble-containing water jet 56 Decompression mixing channel 57 Pressure release water zone 60 Fixing means 62 Fixing means 74 Water flow 75 Bubbles

Claims (4)

An underwater agitating and aeration device for agitating and agitating water in a water tank,
A submersible electric motor with a reduction gear having a rotation shaft in the vertical direction;
A propeller attached to the rotating shaft of the submersible electric motor with a speed reducer, and arranged to suck water from above and discharge it below;
A conical rotary cone below the propeller and attached to the lower end of the rotary shaft of the submersible electric motor with a speed reducer and having a hollow portion inside;
A casing that forms a through-passage in the vertical direction and is disposed so as to surround the outer periphery in the left-right direction of the propeller and the conical rotary cone;
A compressed air pipe provided so as to dispose a compressed air inlet for allowing compressed air to flow into the cavity of the conical rotary cone;
A post body for fixing the submersible electric motor with a speed reducer,
Compressed air can be stored in the cavity,
A water flow path is formed in the gap between the inner peripheral surface of the casing and the outer peripheral surface of the conical rotary cone,
A stepped wall body in which an insertion hole for the compressed air pipe is formed in the central portion below the conical rotating cone and a plurality of disk-shaped bodies having different diameters are stacked so that the peripheral edge portion is stepped. A compressed air outlet is formed by a small vertical gap between the lower end of the conical rotary cone and the surface of the uppermost disk-like body of the stepped wall, and the stepped wall An underwater stirring and aeration apparatus, wherein a reduced pressure mixing channel is formed by a gap between the surface of the stepped portion and the inner peripheral surface of the casing.   The plurality of disk-shaped bodies constituting the staircase-shaped wall body, the disk-shaped body at the lowermost layer being a one-layer form of a rigid body, and the disk-shaped bodies of the other layers are rigid bodies on the upper side, respectively. The underwater stirring and aeration apparatus according to claim 1, wherein the lower side is formed in a two-layer form of an elastic body.   The said disk-shaped body which comprises the said step-like wall body can be attached or detached so that replacement | exchange is possible for the disk-shaped body provided with the elastic body which has different thickness and a different elastic force. Underwater stirring aeration device. The stepped wall body is detachably fixed to a lower part of the support body,
A fixing means for fixing the submersible electric motor with a speed reducer is provided on an upper part of the prop body, and a height adjusting means for adjusting a height of the submersible electric motor with the speed reducer with respect to the prop body is provided in the fixing means,
A fixing means for fixing the casing to the attachment member of the submersible electric motor with a reduction gear is provided, and a height adjusting means for adjusting the height of the casing relative to the submersible electric motor with the reduction gear is provided in the fixing means. The underwater stirring aeration apparatus according to any one of claims 1 to 3.

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