WO2022224575A1 - 水中曝気装置 - Google Patents
水中曝気装置 Download PDFInfo
- Publication number
- WO2022224575A1 WO2022224575A1 PCT/JP2022/006723 JP2022006723W WO2022224575A1 WO 2022224575 A1 WO2022224575 A1 WO 2022224575A1 JP 2022006723 W JP2022006723 W JP 2022006723W WO 2022224575 A1 WO2022224575 A1 WO 2022224575A1
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- WIPO (PCT)
- Prior art keywords
- groove
- main plate
- air
- impeller
- pump chamber
- Prior art date
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- 238000005273 aeration Methods 0.000 title abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 238000009423 ventilation Methods 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000005276 aerator Methods 0.000 claims description 75
- 230000002093 peripheral effect Effects 0.000 claims description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 17
- 238000009434 installation Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
- B01F23/2323—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits
- B01F23/23231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits being at least partially immersed in the liquid, e.g. in a closed circuit
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
- B01F23/23313—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements through a separate conduit substantially parallel with the stirrer axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2333—Single stirrer-drive aerating units, e.g. with the stirrer-head pivoting around an horizontal axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
- B01F23/23342—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer the stirrer being of the centrifugal type, e.g. with a surrounding stator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2335—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the direction of introduction of the gas relative to the stirrer
- B01F23/23353—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the direction of introduction of the gas relative to the stirrer the gas being sucked towards the rotating stirrer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
- B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
- B01F23/237611—Air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/60—Pump mixers, i.e. mixing within a pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/25—Mixers with both stirrer and drive unit submerged in the material being mixed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D31/00—Pumping liquids and elastic fluids at the same time
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—Treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/14—Activated sludge processes using surface aeration
- C02F3/16—Activated sludge processes using surface aeration the aerator having a vertical axis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- the present invention relates to an underwater aerator.
- underwater aerators are known. Such an underwater aerator is disclosed, for example, in Japanese Patent Publication No. 56-11080.
- Japanese Patent Publication No. 56-11080 discloses an air suction impeller for sucking air from the atmosphere, a water pumping impeller for sucking liquid, and an air suction impeller and water pumping impeller through one rotating shaft.
- An aeration device is disclosed that includes a motor that drives an impeller. The aerator is configured to mix liquid and air internally and discharge into the external liquid.
- the present invention has been made to solve the above problems, and one object of the present invention is to improve the amount of air suction (suction pressure) for a given amount of liquid to be introduced. To provide an underwater aerator.
- a submersible aerator includes a vent passage provided above the pump chamber through which air flows, and a vent passage provided below the pump chamber through which liquid flows. a suction port, an impeller disposed in the pump chamber and rotating to allow air to flow in from the air passage and liquid to flow in from the suction port, and a discharge passage to discharge the air and liquid flowing into the pump chamber to the outside.
- the impeller includes a main plate portion arranged to cover a connection port between the air passage and the pump chamber, and blade portions protruding downward from the lower surface of the main plate portion on the suction port side, and the main plate portion includes: A notch portion communicating between the air passage and the pump chamber, and a recessed groove portion recessed downward from the upper surface of the main plate portion and extending from the inner peripheral side to the outer peripheral side of the main plate portion are provided.
- the main plate portion of the impeller has a notch portion that communicates between the air passage and the pump chamber, and is recessed downward from the upper surface of the main plate portion, and a recessed groove portion extending from the inner peripheral side to the outer peripheral side of the main plate portion.
- a plurality of grooves are provided at predetermined intervals in the circumferential direction of the impeller.
- the plurality of grooves can generate negative pressure at a plurality of locations on the impeller, so that the negative pressure generated at the plurality of locations can effectively draw air from the atmosphere into the air passage. can. Therefore, it is possible to further improve the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator.
- a plurality of cutouts and grooves are provided, and the cutouts and grooves are arranged alternately in the circumferential direction of the impeller.
- the cutouts and grooves are alternately arranged in the circumferential direction of the impeller, so that the air flows into the pump chamber in a well-balanced manner and negative pressure is generated in a well-balanced manner in the circumferential direction of the impeller. can be made Therefore, in the circumferential direction of the impeller, it is possible to prevent a biased force from acting on the impeller, so that the impeller can be efficiently rotated.
- the underwater aerator preferably further includes a casing in which the pump chamber is formed, the outer peripheral edge of the groove extends to the outer peripheral edge of the main plate, and the impeller has a cutting edge. Air is allowed to flow into the pump chamber from the air passage through the notch, and air is allowed to flow into the groove, and the air is allowed to flow into the pump chamber from the groove through the gap between the casing and the outer peripheral side end face of the main plate. It is With this configuration, air can flow into the pump chamber not only through the notch portion but also through the gap between the casing and the outer peripheral side end surface of the main plate portion. Therefore, it is possible to further improve the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator.
- a chamfered portion is preferably provided at the outer peripheral end of the groove.
- the chamfered portion can form the air flow path between the groove portion and the gap so as to gradually become smaller. Therefore, the chamfered portion can suppress abrupt changes in the size of the air flow path, thereby reducing pressure loss when air flows into the gap from the groove portion.
- the depth of the groove is preferably 1/3 to 2/3 times the thickness of the main plate. According to this configuration, it is possible to prevent the strength of the main plate portion from decreasing due to the depth of the groove portion being larger than 2 ⁇ 3 times the thickness of the main plate portion. Moreover, it is possible to prevent the negative pressure generated by the groove from becoming too small due to the depth of the groove being less than 1 ⁇ 3 times the thickness of the main plate.
- the underwater aerator preferably further includes a rotating shaft that supports an impeller, and the impeller has a boss portion that is coaxial with the rotating shaft and arranged on the inner peripheral side of the main plate portion. Further including, the inner peripheral end of the groove extends to the boss. With this configuration, the inner peripheral side end of the groove can be formed up to the boss, so that a large negative pressure can be generated by the groove when the impeller rotates. Therefore, it is possible to effectively allow air to flow in from the atmosphere through the ventilation path. Therefore, it is possible to further improve the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator.
- the width of the groove is greater than the depth of the groove in the circumferential direction of the main plate.
- connection port is formed in a circular shape on the inner peripheral side end surface of the casing, and the casing is arranged above the main plate portion so as to cover the main plate portion. It includes an annular portion facing the upper surface of the main plate portion, and an outer peripheral side portion of the groove portion is arranged at a position overlapping with the annular portion in a plan view, and an inner peripheral side portion of the groove portion is a connection port. are placed in overlapping positions.
- the grooves are preferably curved in an arc shape when viewed from above.
- the groove can be formed longer than when the groove is formed linearly, so that negative pressure can be generated in a wider range. can be done. Therefore, it is possible to further improve the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator.
- FIG. 2 is a partially enlarged view of part A of FIG. 1;
- FIG. 4 is a diagram showing a graph of the relationship between water depth and air content in Examples and Comparative Examples.
- FIG. 4 is a diagram showing a table of the relationship between water depth and air amount in Examples and Comparative Examples. It is a top view of the impeller by the 1st modification. It is a top view of the impeller by the 2nd modification.
- the underwater aerator 100 is installed on the bottom surface of a water storage area such as an aeration tank, and aerates the water storage area.
- the submersible aerator 100 is set at a relatively deep part of the water storage area and is capable of performing deep tank aeration.
- the submersible aerator 100 is configured to generate negative pressure in the pump chamber 20 by rotating the impeller 5 in the pump chamber (gas-liquid mixing chamber) 20 .
- the submersible aerator 100 is configured to allow air to flow in from the atmosphere above the liquid surface of the aeration tank and liquid in the aeration tank to flow.
- the submersible aerator 100 rotates the impeller 5 in the pump chamber 20 to mix the air and the liquid, and then discharge the air and the liquid (gas-liquid mixture) into the liquid in the aeration tank.
- the gas-liquid mixture discharged from the underwater aerator 100 has a higher dissolved oxygen content than the liquid flowing into the underwater aerator 100 .
- the underwater aerator 100 includes a ventilation chamber (housing) 1, a guide casing 2, and a suction cover 3.
- the guide casing 2 is formed with a pump chamber 20 in which the impeller 5 is arranged.
- the guide casing 2 is an example of the "casing" in the claims.
- the underwater aerator 100 also includes a motor 4 including a rotating shaft (output shaft) 40 and an impeller 5 .
- a ventilation path (air chamber) 10 through which air flows is provided above a pump chamber 20 in the ventilation chamber (casing) 1 . Further, the ventilation chamber 1 is provided with an air inlet 11 for allowing air to flow into the underwater aerator 100 at the upstream end of the ventilation path 10 .
- a ventilation conduit P is connected to the air inlet 11 from above.
- the aeration conduit P is connected to the air inlet 11 at one end on the downstream side and is arranged in the atmosphere above the liquid level of the aeration tank so that the other end on the upstream side allows the inflow of air.
- a blower device (blower) for blowing air into the ventilation conduit P may be installed at the other end of the ventilation conduit P on the upstream side.
- the guide casing 2 is directly attached to the ventilation chamber (housing) 1 from below.
- the guide casing 2 is provided with a plurality of discharge passages 21 radially extending from a central pump chamber (gas-liquid mixing chamber) 20 in plan view.
- the discharge path 21 is a path for flowing into the pump chamber 20 and discharging air and liquid (gas-liquid mixture) mixed in the pump chamber 20 into the liquid in the aeration tank.
- the guide casing 2 includes an annular portion 22 on the upper portion of the guide casing 2 (ventilation chamber 1 side).
- the annular portion 22 is arranged above the main plate portion 50 so as to cover the main plate portion 50 of the impeller 5 and faces the upper surface 50b of the main plate portion 50 from above.
- the annular portion 22 is arranged with a slight gap from the upper surface 50b of the main plate portion 50 with the width direction being the vertical direction (see FIG. 5). As an example, the size of this gap is 0.5 mm.
- connection port 22 a that connects the air passage (air chamber) 10 and the pump chamber 20 is provided in the guide casing 2 (annular portion 22 ).
- the connection port 22a is a circular hole formed in the inner peripheral end surface of the guide casing 2 .
- the circular connection port 22a is arranged inside the arc-shaped outer edge of the impeller 5 in plan view. Therefore, the connection port 22 a is arranged directly above the impeller 5 .
- the center position of the connection port 22 a substantially coincides with the rotation center axis line ⁇ of the rotating shaft 40 .
- the suction cover 3 is directly attached to the guide casing 2 from below.
- the suction cover 3 is removed from the guide casing 2 when the impeller 5 is attached to and removed from the rotary shaft 40 .
- a pump chamber 20 is arranged above the suction cover 3 .
- a suction port 30 into which liquid flows is provided in the suction cover 3 below the pump chamber 20 .
- the suction port 30 is a circular hole formed in the inner peripheral end surface of the suction cover 3 .
- the suction port 30 is arranged directly below the impeller 5 .
- the center position of the suction port 30 substantially coincides with the rotation center axis line ⁇ of the rotating shaft 40 .
- the rotary shaft 40 rotatably supports the impeller 5 .
- the impeller 5 is attached to the lower end of the rotating shaft 40 with a fixing member F.
- the fixing member F is, for example, a bolt.
- the fixing member F is arranged inside the boss portion 52 of the impeller 5 .
- the rotation direction (RO direction) of the rotating shaft 40 is the clockwise direction (RO direction) in plan view.
- the motor 4 has a stator and a rotor that rotatably supports the rotating shaft 40 .
- the motor 4 is configured to rotationally drive the impeller 5 via a rotating shaft 40 to which the impeller 5 is attached.
- an oil chamber 6 in which a mechanical seal 6a is installed along the rotating shaft 40 is provided.
- the mechanical seal 6a has a function of preventing (suppressing) the liquid in the pump chamber 20 (ventilation path 10) from flowing into the motor 4 side.
- the impeller 5 shown in FIGS. 2 to 4 has the function of inflowing liquid and air into the underwater aerator 100 .
- the impeller 5 also has a function of mixing liquid and air inside the underwater aerator 100 . That is, the impeller 5 has the function of generating a gas-liquid mixture.
- the impeller 5 also has a function of discharging the mixed liquid and air (gas-liquid mixture) into the liquid outside the underwater aerator 100 .
- the impeller 5 includes a main plate portion (shroud) 50 arranged to cover the connection port 22a between the air passage 10 and the pump chamber 20, and a plurality of ( 5) vanes 51 and bosses 52 .
- the main plate portion 50 extends in the horizontal direction and is generally formed in a disk shape with the vertical direction as the thickness direction.
- the plurality of blade portions 51 are arranged at equal angular intervals in the circumferential direction (R direction) of the impeller 5 .
- the blade portion 51 is formed of a U-shaped curved surface and a flat surface arranged at the lower end of the U-shaped curved surface when viewed from below.
- the boss portion 52 protrudes upward from the upper surface 50b of the main plate portion 50.
- the boss portion 52 is arranged coaxially with the rotating shaft 40 and on the inner peripheral side of the main plate portion 50 .
- the boss portion 52 is formed in a hollow columnar shape with an open bottom side.
- the fixing member F for attaching the impeller 5 to the rotating shaft 40 is arranged inside the boss portion 52 as described above.
- the main plate portion 50 is provided with a plurality (five) of notch portions 53 and a plurality (five) of groove portions 54 .
- the plurality of cutouts 53 are arranged at equal angular intervals in the circumferential direction of the impeller 5 .
- the plurality of grooves 54 are arranged at equal angular intervals in the circumferential direction of the impeller 5 .
- the plurality of notches 53 and the plurality of grooves 54 are alternately arranged in the circumferential direction of the impeller 5 .
- the notch portion 53 communicates the air passage 10 and the pump chamber 20 .
- the notch portion 53 cuts the main plate portion 50 in a U shape in plan view (as seen from below).
- the cutout portion 53 extends linearly in the radial direction of the blade portion 51 .
- a portion of the notch portion 53 is arranged inside the blade portion 51 .
- the cutout portion 53 is connected to the pump chamber 20 at the outer peripheral end surface of the blade portion 51 .
- An inner peripheral side end portion 53 a of the notch portion 53 extends to the boss portion 52 .
- An inner peripheral side end portion 53a of the notch portion 53 is formed in a semicircular shape in plan view.
- the groove portion 54 is formed in a concave shape recessed from the upper surface 50b of the main plate portion 50 toward the lower surface 50a of the main plate portion 50 .
- the groove portion 54 extends from the inner peripheral side to the outer peripheral side of the main plate portion 50 .
- An inner peripheral side end portion 54 a of the groove portion 54 extends to the boss portion 52 .
- An inner peripheral side end portion 54a of the groove portion 54 is formed in a semicircular shape in plan view.
- An outer peripheral end portion 54 b of the groove portion 54 extends to an outer peripheral end surface 50 c of the main plate portion 50 .
- a chamfered portion 54c is provided at an outer peripheral end portion 54b of the groove portion 54 .
- the chamfered portion 54c is a so-called C chamfer. Note that the chamfered portion may be of other chamfered shape such as R chamfered shape.
- the groove portion 54 is curved in an arc shape in plan view. Specifically, the groove portion 54 has a rotation axis that is larger in the portion between the inner peripheral side end portion 54a and the outer peripheral side end portion 54b than the inner peripheral side end portion 54a and the outer peripheral side end portion 54b of the groove portion 54 in plan view. It is curved so as to be positioned on the side of the rotation direction (RO direction) of 40 .
- the width L1 of the groove portion 54 shown in FIG. 4 is substantially constant. Moreover, in the circumferential direction of the impeller 5, the width L1 of the groove portion 54 is larger than the depth L2 (see FIG. 5) of the groove portion 54 (L1>L2). As a more specific example, in the circumferential direction of the impeller 5, the width L1 of the groove portion 54 is substantially equal to the width L10 of the notch portion 53 (L1 ⁇ L10).
- the outer peripheral side portion of the groove portion 54 is arranged at a position overlapping the annular portion 22 of the guide casing 2, and the inner peripheral side portion of the groove portion 54 is arranged at a position overlapping with the connection port 22a. That is, the underwater aerator 100 is configured to allow air to flow into the pump chamber 20 from a position directly above the impeller 5 on the inner peripheral side of the impeller 5 .
- the impeller 5 allows air to flow into the pump chamber 20 from the air passage 10 through the notch portion 53 and air from the air passage 10 to the groove portion 54, so that the guide casing 2 and the main plate portion 50 are connected. Air is allowed to flow into the pump chamber 20 from the groove portion 54 through a gap C (see FIG. 5) with the outer peripheral side end face 50c of the groove portion 54. As shown in FIG.
- the impeller 5 rotates, a negative pressure is generated inside the groove 54 and air flows into the inside of the groove 54 from the air passage 10 . Then, the air that has flowed inside the groove portion 54 flows into the pump chamber 20 through the gap C. As shown in FIG. As an example, the size of this gap C is 0.5 mm.
- the submersible aerator 100 allows air to flow into the pump chamber 20 from the air passage 10 via the notch 53 and the gap C, it is arranged so that the air flows into the pump chamber only from the notch. Compared to the case where the impeller is formed without providing the groove, the amount of air can be increased with respect to the amount of liquid to be flowed into the underwater aerator 100 . Therefore, the underwater aerator 100 can effectively take in air. Therefore, the underwater aerator 100 can effectively increase the amount of dissolved oxygen in the air and liquid (gas-liquid mixture) discharged into the liquid in the aeration tank.
- the main plate portion 50 of the impeller 5 includes the notch portion 53 that communicates the air passage 10 and the pump chamber 20, and the cutout portion 53 that is recessed from the upper surface 50b of the main plate portion 50 toward the lower surface 50a. , and a concave groove portion 54 extending from the inner peripheral side to the outer peripheral side of the main plate portion 50 .
- air can flow into the pump chamber 20 via the notch 53, and negative pressure can be generated by the groove 54 when the impeller 5 rotates.
- the air can be effectively made to flow into the air passage 10 from the . That is, the shape of the impeller 5, which is the groove portion 54, can improve the air intake amount (suction pressure). Therefore, it is possible to improve (increase) the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator 100 .
- a plurality of grooves 54 are provided at predetermined intervals in the circumferential direction of the impeller 5 .
- negative pressure can be generated at a plurality of locations of the impeller 5 by the plurality of grooves 54, so that the negative pressure generated at the plurality of locations allows air from the atmosphere to flow into the ventilation passage 10 more effectively. . Therefore, the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator 100 can be further improved.
- a plurality of cutout portions 53 and groove portions 54 are provided, and the plurality of cutout portions 53 and the plurality of groove portions 54 are arranged alternately in the circumferential direction of the impeller 5. ing.
- the notch portions 53 and the groove portions 54 are alternately arranged in the circumferential direction of the impeller 5, so that the air flows into the pump chamber 20 in a well-balanced manner in the circumferential direction of the impeller 5, and the negative pressure is generated in a well-balanced manner. can be generated. Therefore, in the circumferential direction of the impeller 5, it is possible to prevent a biased force from acting on the impeller 5, so that the impeller 5 can be efficiently rotated.
- the present embodiment further includes the guide casing 2 in which the pump chamber 20 is formed.
- the car 5 allows air to flow into the pump chamber 20 from the air passage 10 through the notch 53 and also to the groove 54 to close the gap C between the guide casing 2 and the outer peripheral end face 50c of the main plate 50. It is configured to allow air to flow into the pump chamber 20 from the groove portion 54 through the groove portion 54 . This allows air to flow into the pump chamber 20 not only through the cutout portion 53 but also through the gap C between the guide casing 2 and the outer peripheral end surface 50 c of the main plate portion 50 . Therefore, it is possible to further improve the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator 100 .
- the outer peripheral edge 54b of the groove 54 is provided with the chamfered portion 54c.
- the chamfered portion 54c can form an air flow path between the groove portion 54 and the gap C so as to gradually become smaller. Therefore, since the chamfered portion 54c can suppress a sudden change in the size of the air flow path, the pressure loss when the air flows into the gap C from the groove portion 54 can be reduced.
- the depth L2 of the groove portion 54 is 1 ⁇ 3 times or more and 2 ⁇ 3 times or less the thickness L3 of the main plate portion 50 . Accordingly, it is possible to prevent the strength of the main plate portion 50 from decreasing due to the depth L2 of the groove portion 54 being larger than 2 ⁇ 3 times the thickness L3 of the main plate portion 50 . Moreover, it is possible to prevent the negative pressure generated by the groove 54 from becoming too small due to the depth L2 of the groove 54 being less than 1 ⁇ 3 times the thickness L3 of the main plate 50 .
- the rotating shaft 40 that supports the impeller 5 is further provided. Further including a portion 52 , the inner peripheral end 54 a of the groove 54 extends to the boss portion 52 . As a result, the inner peripheral side end portion 54a of the groove portion 54 can be formed up to the boss portion 52, so that a large negative pressure can be generated by the groove portion 54 when the impeller 5 rotates. Therefore, it is possible to effectively allow air to flow into the air passage 10 from the atmosphere. Therefore, the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator 100 can be further improved.
- the width L1 of the groove portion 54 is greater than the depth L2 of the groove portion 54 in the circumferential direction of the main plate portion 50 .
- the width of the groove portion 54 forming the opening on the side into which the air flows can be made relatively large, so that the air can flow into the groove portion 54 efficiently.
- connection port 22a is formed in a circular shape on the inner peripheral side end surface of the guide casing 2, and the guide casing 2 is arranged above the main plate portion 50 so as to cover the main plate portion 50.
- the guide casing 2 is arranged above the main plate portion 50 so as to cover the main plate portion 50.
- the portion is arranged at a position overlapping the connection port 22a.
- the groove portion 54 is curved in an arc shape in plan view.
- the groove 54 can be formed longer than in the case of forming the groove in a straight line, so that negative pressure can be generated in a wider range. . Therefore, the air suction amount (suction pressure) with respect to a predetermined amount of liquid flowing into the underwater aerator 100 can be further improved.
- the installation water depth of the underwater aerator described in the above embodiment is changed in the range of 1.5 [m] to 4.0 [m], and the entrance portion of the ventilation pipe placed in the atmosphere
- the output value to the motor was set to 0.75 [kW]
- the drive frequency of the motor was set to 60 [Hz].
- the impeller of the underwater aerator of the embodiment is provided with both grooves and notches.
- the installation water depth of the underwater aerator having an impeller with a shape different from that of the above example was changed in the range of 1.5 [m] to 4.0 [m].
- the amount of air entering from the inlet portion of the installed vent conduit was measured.
- the operating conditions of the underwater aerator of the comparative example are the same as those of the above example.
- the underwater aerator of the comparative example has the same configuration as the underwater aerator of the example except for the impeller.
- the impeller of the submerged aerator of the comparative example is not provided with grooves.
- the impeller of the submerged aerator of the comparative example has the same shape as the impeller of the submerged aerator of the example, except that the groove is not provided.
- the air volume of the example was larger than that of the comparative example at any installation water depth. Specifically, at an installation water depth of 1.5 [m], the air volume of the example was 10.9 [Sm 3 /h], and the air volume of the comparative example was 8.8 [Sm 3 /h]. At the installation water depth of 2.0 [m], the air amount of the example was 10.6 [Sm 3 /h], and the air amount of the comparative example was 8.6 [Sm 3 /h]. At the installation water depth of 2.5 [m], the air amount of the example was 8.9 [Sm 3 /h], and the air amount of the comparative example was 8.2 [Sm 3 /h].
- the air amount of the example was 7.6 [Sm 3 /h]
- the air amount of the comparative example was 6.6 [Sm 3 /h].
- the air amount of the example was 6.5 [Sm 3 /h]
- the air amount of the comparative example was 4.8 [Sm 3 /h].
- the air volume of the example was 5.4 [Sm 3 /h]
- the air volume of the comparative example was 3.8 [Sm 3 /h].
- the present invention is not limited to this.
- the present invention for example, like the impeller 205 shown in FIG.
- the groove portion 254 may be curved so that the portion between 54b is located on the side opposite to the rotation direction (RO direction) of the rotating shaft 40 . That is, the groove portion 254 may be curved in the opposite direction to the embodiment.
- the groove 354 may be formed so as to extend linearly in the radial direction of the impeller 305 .
- the groove may be formed so as to extend linearly in a direction inclined with respect to the radial direction of the impeller.
- each of the grooves and notches may be provided in numbers different from five.
- the width of the groove is not limited to the configuration described in the above embodiment, and the width of the groove may be changed to a width different from that in the above embodiment.
- the depth of the groove is not limited to the configuration described in the above embodiment, and the depth of the groove may be changed to a depth different from that in the above embodiment.
- the present invention is not limited to this.
- the blade portion and the notch portion may be formed separately.
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- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
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Abstract
Description
(水中曝気装置の構成)
図1~図5を参照して、水中曝気装置100の実施形態について説明する。なお、各図では、上方をZ1方向により示し、下方をZ2方向により示す。また、羽根車5の周方向をR方向により示す。
通気室(筐体)1には、ポンプ室20の上方側に、空気が流入する通気路(空気室)10が設けられている。また、通気室1には、通気路10の上流側の端部に、空気を水中曝気装置100の内部に流入させる空気流入口11が設けられている。空気流入口11には、上方側から通気導管Pが接続されている。通気導管Pは、下流側の一端が空気流入口11に接続され、上流側の他端が空気を流入させることが可能なように曝気槽の液面上の大気中に配置されている。なお、通気導管Pの上流側の他端には、通気導管P内に空気を送り込むブロワ装置(送風機)が設置されてもよい。
ガイドケーシング2は、通気室(筐体)1に対して下方側から直接取り付けられている。ガイドケーシング2には、平面視で、中央のポンプ室(気液混合室)20から放射状に延びる複数の排出路21が設けられている。排出路21は、ポンプ室20に流入して、ポンプ室20において混合された空気および液体(気液混合体)を曝気槽内の液体中に排出するための経路である。
サクションカバー3は、ガイドケーシング2に対して下方側から直接取り付けられている。サクションカバー3は、回転軸40に対する羽根車5の取り付け作業および取り外し作業の際に、ガイドケーシング2から取り外される。サクションカバー3の上方には、ポンプ室20が配置されている。サクションカバー3には、ポンプ室20の下方側に、液体が流入する吸込口30が設けられている。吸込口30は、サクションカバー3の内周側端面に円形状に形成された穴である。吸込口30は、羽根車5の直下に配置されている。吸込口30の中心位置は、回転軸40の回転中心軸線αと略一致している。
回転軸40は、羽根車5を回転可能に支持している。詳細には、回転軸40の下端には、固定部材Fにより羽根車5が取り付けられている。固定部材Fとは、たとえば、ボルトなどである。なお、固定部材Fは、羽根車5のボス部52の内側に配置されている。回転軸40の回転方向(RO方向)は、平面視で時計回り方向(RO方向)である。モータ4は、固定子と、回転軸40を回転可能に支持する回転子とを有している。モータ4は、羽根車5が取り付けられた回転軸40を介して、羽根車5を回転駆動させるように構成されている。
図2~図4に示す羽根車5は、水中曝気装置100の内部に液体および空気を流入させる機能を有している。また、羽根車5は、水中曝気装置100の内部で、液体および空気を混合する機能を有している。すなわち、羽根車5は、気液混合体を生成する機能を有している。また、羽根車5は、混合した液体および空気(気液混合体)を水中曝気装置100の外部の液体中に排出する機能を有している。
切り欠き部53は、通気路10とポンプ室20とを連通している。切り欠き部53は、平面視で(下方から見て)、主板部50をU字状に切り欠いている。切り欠き部53は、羽根部51の半径方向に直線状に延びている。切り欠き部53の一部は、羽根部51の内側に配置されている。切り欠き部53は、羽根部51の外周側の端面において、ポンプ室20に接続されている。切り欠き部53の内周側端部53aは、ボス部52まで延びている。切り欠き部53の内周側端部53aは、平面視で半円状に形成されている。
溝部54は、主板部50の下面50aに向けて主板部50の上面50bから窪む凹状に形成されている。溝部54は、主板部50の内周側から外周側に延びている。
本実施形態では、以下のような効果を得ることができる。
次に、図6および図7を参照して、実施例について説明する。
図6および図7に示すように、いずれの設置水深でも、実施例の方が比較例よりも空気量が大きくなった。詳細には、設置水深1.5[m]では、実施例の空気量が10.9[Sm3/h]となり、比較例の空気量が8.8[Sm3/h]となった。設置水深2.0[m]では、実施例の空気量が10.6[Sm3/h]がとなり、比較例の空気量が8.6[Sm3/h]となった。設置水深2.5[m]では、実施例の空気量が8.9[Sm3/h]がとなり、比較例の空気量が8.2[Sm3/h]となった。設置水深3.0[m]では、実施例の空気量が7.6[Sm3/h]がとなり、比較例の空気量が6.6[Sm3/h]となった。設置水深3.5[m]では、実施例の空気量が6.5[Sm3/h]がとなり、比較例の空気量が4.8[Sm3/h]となった。設置水深4.0[m]では、実施例の空気量が5.4[Sm3/h]がとなり、比較例の空気量が3.8[Sm3/h]となった。
なお、今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく請求の範囲によって示され、さらに請求の範囲と均等の意味および範囲内でのすべての変更(変形例)が含まれる。
5、205、305 羽根車
10 通気路
20 ポンプ室
21 排出路
22 環状部
22a 接続口
30 吸込口
40 回転軸
50 主板部
50a (主板部の)下面
50b (主板部の)上面
50c (主板部の)外周側端面
51 羽根部
52 ボス部
53 切り欠き部
54、254、354 溝部
54a (溝部の)内周側端部
54b (溝部の)外周側端部
54c 面取り部
100 水中曝気装置
C 隙間
L1 溝部の幅
L2 溝部の深さ
L3 主板部の厚み
Claims (10)
- ポンプ室の上方側に設けられ、空気が流入する通気路と、
前記ポンプ室の下方側に設けられ、液体が流入する吸込口と、
前記ポンプ室に配置され、回転により前記通気路から空気を流入させるとともに、前記吸込口から液体を流入させる羽根車と、
前記ポンプ室に流入した空気および液体を外部に排出する排出路と、を備え、
前記羽根車は、前記通気路と前記ポンプ室との接続口を覆うように配置される主板部と、前記主板部の前記吸込口側の下面から下方に突出する羽根部とを含み、
前記主板部には、前記通気路と前記ポンプ室とを連通する切り欠き部と、前記下面に向けて前記主板部の上面から窪むとともに、前記主板部の内周側から外周側に延びる凹状の溝部とが設けられている、水中曝気装置。 - 前記溝部は、前記羽根車の周方向に所定の間隔で複数設けられている、請求項1に記載の水中曝気装置。
- 前記切り欠き部および前記溝部の各々は、複数設けられ、
複数の前記切り欠き部および複数の前記溝部は、前記羽根車の周方向において、交互に配置されている、請求項1または2に記載の水中曝気装置。 - 前記ポンプ室が内側に形成されるケーシングをさらに備え、
前記溝部の外周側端部は、前記主板部の外周側端面まで延びており、
前記羽根車は、前記切り欠き部を介して前記通気路から前記ポンプ室に空気を流入させるとともに、前記溝部に空気を流入させて前記ケーシングと前記主板部の前記外周側端面との隙間を介して前記溝部から前記ポンプ室に空気を流入させるように構成されている、請求項1~3のいずれか1項に記載の水中曝気装置。 - 前記溝部の前記外周側端部には、面取り部が設けられている、請求項4に記載の水中曝気装置。
- 前記溝部の深さは、前記主板部の厚みの1/3倍以上2/3倍以下の大きさである、請求項1~5のいずれか1項に記載の水中曝気装置。
- 前記羽根車を支持する回転軸をさらに備え、
前記羽根車は、前記回転軸と同軸上で、かつ、前記主板部の内周側に配置されるボス部をさらに含み、
前記溝部の内周側端部は、前記ボス部まで延びている、請求項1~6のいずれか1項に記載の水中曝気装置。 - 前記主板部の周方向において、前記溝部の幅は、前記溝部の深さよりも大きい、請求項1~7のいずれか1項に記載の水中曝気装置。
- 前記接続口は、前記ケーシングの内周側の端面に円形状に形成され、
前記ケーシングは、前記主板部を覆うように前記主板部の上方に配置され、前記主板部の前記上面と対向する円環状の環状部を含み、
平面視において、前記溝部の外周側部分は、前記環状部と重なる位置に配置されるとともに、前記溝部の内周側部分は、前記接続口と重なる位置に配置されている、請求項4または5に記載の水中曝気装置。 - 前記溝部は、平面視において、弧状に湾曲している、請求項1~9のいずれか1項に記載の水中曝気装置。
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US18/276,564 US11951447B1 (en) | 2021-04-20 | 2022-02-18 | Submersible aeration apparatus |
EP22791358.9A EP4268945A4 (en) | 2021-04-20 | 2022-02-18 | UNDERWATER AERATION DEVICE |
CN202290000391.5U CN221117164U (zh) | 2021-04-20 | 2022-02-18 | 水中曝气装置 |
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JP2021071063A JP7259885B2 (ja) | 2021-04-20 | 2021-04-20 | 水中曝気装置 |
JP2021-071063 | 2021-04-20 |
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EP (1) | EP4268945A4 (ja) |
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CN118221266A (zh) * | 2024-04-26 | 2024-06-21 | 蓝深集团股份有限公司 | 一种mbr一体化污水处理设备 |
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CN221117164U (zh) | 2024-06-11 |
EP4268945A1 (en) | 2023-11-01 |
TW202302475A (zh) | 2023-01-16 |
US11951447B1 (en) | 2024-04-09 |
EP4268945A4 (en) | 2024-04-24 |
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JP2022165640A (ja) | 2022-11-01 |
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