CA1092260A - Submersible aerator - Google Patents
Submersible aeratorInfo
- Publication number
- CA1092260A CA1092260A CA283,073A CA283073A CA1092260A CA 1092260 A CA1092260 A CA 1092260A CA 283073 A CA283073 A CA 283073A CA 1092260 A CA1092260 A CA 1092260A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- aerator
- motor
- shaft
- impeller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
-
- 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
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
SUBMERSIBLE AERATOR
Abstract of the Disclosure A submersible aerator comprising a motor having a housing and an output shaft and an aerator housing mounted on the motor housing and surrounding a portion of the shaft. The motor and aerator housing are mounted such that the aerator housing is vertically below the motor. The aerator housing has a lower exposed surface and an impeller is mounted on the lower end of the shaft.
The impeller has a plurality of spiral vanes closely spaced to the lower surface of the aerator housing.
The aerator housing has a cavity defining an annular space surrounding a portion of the shaft within said aerator housing, and an annular opening extending axially from the annular space to the lower surface of the aerator housing. The aerator housing has a generally radial passage extending from the exterior thereof to the annular space. The radial passage is connected by a pipe such that air can be supplied from above the liquid in which the submersible aerator is positioned. Upon rotation of said impeller, air is drawn through the radial inlet to the annular space and thereafter axially through the annular opening but the liquid does not enter the area of the annular space.
-i-
Abstract of the Disclosure A submersible aerator comprising a motor having a housing and an output shaft and an aerator housing mounted on the motor housing and surrounding a portion of the shaft. The motor and aerator housing are mounted such that the aerator housing is vertically below the motor. The aerator housing has a lower exposed surface and an impeller is mounted on the lower end of the shaft.
The impeller has a plurality of spiral vanes closely spaced to the lower surface of the aerator housing.
The aerator housing has a cavity defining an annular space surrounding a portion of the shaft within said aerator housing, and an annular opening extending axially from the annular space to the lower surface of the aerator housing. The aerator housing has a generally radial passage extending from the exterior thereof to the annular space. The radial passage is connected by a pipe such that air can be supplied from above the liquid in which the submersible aerator is positioned. Upon rotation of said impeller, air is drawn through the radial inlet to the annular space and thereafter axially through the annular opening but the liquid does not enter the area of the annular space.
-i-
Description
~092260 This invention relates to submersible aerators.
Backqround and Summary of the Invention In the treatment of liquids such as sewage, it is well known that aeration of the sewage is an important element in the treatment.
In United States Patent 3,920,779, there is dis-closed an aerator wherein an electric motor is enclosed in a housing with the shaft of the motor extending upwardly through a seal. An impeller is mounted on the upper end of the motor and is associated with a shroud plate, supported on the housing by posts. Upon rotation of the impeller, air is drawn through a vertical centrally located pipe to produce the aerating action. Fins are provided on the - housing below the impeller to facilitate the action.
Although the aforementioned construction effec-tively provides the aeration, it inherently includes problems of assembly and maintenance due to the exposure of the seal between the shaft and the housing surrounding the motor, the interference of the posts and fins due to 20 the solids in the liquid, the critical relationship -between the impeller and the shroud plate which is difficult to maintain because of the number of parts used, the possible damage in handling because of the nature of the construction, and the possible damage to the electrical cord which must extend upwardly from the impeller and around the impeller. ~
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The present invention is intended to provide a submersible aerator which will obviate the aforementioned difficulties.
In accordance with the invention, the submersible aerator comprises a motor having a housing and an output shaft and an aerator housing mounted on or forming a part of the motor housing and surrounding a portion of the shaft.
The motor and aerator housing are mounted such that the aerator housing extends vertically below the motor. The -aerator housing has a lower exposed surface and an impeller is mounted on the lower end of the shaft. The impeller has a plurality of spiral vanes closely spaced to the lower sur-face of the aerator housing. The aerator housing has a cavity defining an annular space surrounding a portion of the shaft within said aerator housing and an annular opening extending axially from the annular space to the lower surface of the aerator housing. The aerator housing has a generally radial passage extending from the exterior thereof to the annular space. The radial passage is connected by a pipe such that air can be supplied from above the liquid in which the submersible aerator is positioned. Upon rotation of said impeller, air is drawn through the radial inlet to the annular space and thereafter axially through the annular opening but ~
25 the liquid does not enter the area of the annular space. -,." ;,: :
lO~Z2~;0 Description of the Drawin~s Fig. 1 is a part sectional elevational view of a submersible aerator embodying the invention.
Fig. 2 is a sectional view taken along the line
Backqround and Summary of the Invention In the treatment of liquids such as sewage, it is well known that aeration of the sewage is an important element in the treatment.
In United States Patent 3,920,779, there is dis-closed an aerator wherein an electric motor is enclosed in a housing with the shaft of the motor extending upwardly through a seal. An impeller is mounted on the upper end of the motor and is associated with a shroud plate, supported on the housing by posts. Upon rotation of the impeller, air is drawn through a vertical centrally located pipe to produce the aerating action. Fins are provided on the - housing below the impeller to facilitate the action.
Although the aforementioned construction effec-tively provides the aeration, it inherently includes problems of assembly and maintenance due to the exposure of the seal between the shaft and the housing surrounding the motor, the interference of the posts and fins due to 20 the solids in the liquid, the critical relationship -between the impeller and the shroud plate which is difficult to maintain because of the number of parts used, the possible damage in handling because of the nature of the construction, and the possible damage to the electrical cord which must extend upwardly from the impeller and around the impeller. ~
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, ,, ~ .; . ... .
~J9Z~fiO
The present invention is intended to provide a submersible aerator which will obviate the aforementioned difficulties.
In accordance with the invention, the submersible aerator comprises a motor having a housing and an output shaft and an aerator housing mounted on or forming a part of the motor housing and surrounding a portion of the shaft.
The motor and aerator housing are mounted such that the aerator housing extends vertically below the motor. The -aerator housing has a lower exposed surface and an impeller is mounted on the lower end of the shaft. The impeller has a plurality of spiral vanes closely spaced to the lower sur-face of the aerator housing. The aerator housing has a cavity defining an annular space surrounding a portion of the shaft within said aerator housing and an annular opening extending axially from the annular space to the lower surface of the aerator housing. The aerator housing has a generally radial passage extending from the exterior thereof to the annular space. The radial passage is connected by a pipe such that air can be supplied from above the liquid in which the submersible aerator is positioned. Upon rotation of said impeller, air is drawn through the radial inlet to the annular space and thereafter axially through the annular opening but ~
25 the liquid does not enter the area of the annular space. -,." ;,: :
lO~Z2~;0 Description of the Drawin~s Fig. 1 is a part sectional elevational view of a submersible aerator embodying the invention.
Fig. 2 is a sectional view taken along the line
2-2 in Fig. 1.
Fig. 3 is a fragmentary sectional view taken along the line 3-3 in Fig. 1.
Fig. 4 is a part sectional elevational view of a modified form of submersible aerator.
Fig. 5 is a partly diagrammatic view showing a submersible aerator in position in a sewage treatment environment.
.~ ' .
DescriPtion Referring to Fig. 5, the submersible aerator embodying the invention may be used, for example, in a sewage or waste treatment unit embodying a tank 10 that has an inlet 11 and an outlet 12. The liquid to be treated is directed into the inlet and passes through the tank where it is aerated and the solids settled out and ~ --20 then through filters 13 to the outlet 12. ~
The aerator 15 is provided at the bottom of -.-: . , the tank and is supplied with air, as presently described, by a pipe and with electrical power by a cord C.
Referring to Fig. 1, the submersible aerator 15 comprises a motor 16 extending generally vertically, an aerator housing 17 mounted on the lower end of the motor, and an lmpeller 18 mounted on the shaft of the motor.
Fig. 3 is a fragmentary sectional view taken along the line 3-3 in Fig. 1.
Fig. 4 is a part sectional elevational view of a modified form of submersible aerator.
Fig. 5 is a partly diagrammatic view showing a submersible aerator in position in a sewage treatment environment.
.~ ' .
DescriPtion Referring to Fig. 5, the submersible aerator embodying the invention may be used, for example, in a sewage or waste treatment unit embodying a tank 10 that has an inlet 11 and an outlet 12. The liquid to be treated is directed into the inlet and passes through the tank where it is aerated and the solids settled out and ~ --20 then through filters 13 to the outlet 12. ~
The aerator 15 is provided at the bottom of -.-: . , the tank and is supplied with air, as presently described, by a pipe and with electrical power by a cord C.
Referring to Fig. 1, the submersible aerator 15 comprises a motor 16 extending generally vertically, an aerator housing 17 mounted on the lower end of the motor, and an lmpeller 18 mounted on the shaft of the motor.
- 3 -, . , :.,., " ,; ":,'' , ' ' ':
~09;~60 Legs 19, 20, 21 extend from the aerator housing 17 to support the submersible aerator 15 near the bottom of the tank 10.
As further shown in Fig. 1, the motor 16 includes a frame comprising uppèr and lower housings 22, 23 which are bolted together as by bolts 24 and nuts 25 to produce a liquid-tight enclosure. Stator winding 26 of the motor is positioned within the frame and the shaft 27 with the rotating winding or rotor 28 thereon is mounted for rotation within the frame by bearings 29, 30. The lower end of the shaft 27 extends downwardly through a hub 31 that has a cylindrical outer surface.
The aerator housing 17 includes a cylindrical wall 32 that is telescoped over the hub 31 and a set lS screw 33 holds the aerator housing 17 on the hub 31.
The end ~4 of the wall 32 is accurately machined or molded -to engage an accurately machined or molded annular surface 35 on the lower motor housing 23 to accurately locate the aerator axially on the motor.
The interior of the annular wall 32 is spaced from the shaft 27 to define an annular space 36 surrounding a portion of the shaft 27 within the aerator housing 17. -,j.
An oil seal assembly 37, 38 and spacer 39 are provided in this area. A radial inlet 40 extends from the exterior 25 of the aerator housing 17 to the annular space 36 and -the pipe 14 is connected thereto.
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The upper and lower housings 22, 23, aerator housing 17 and impeller 18 may be made of any dimensionally stable corrosion resistant material such as brass, cast iron or plastic.
The impeller 18 has a hub 41 that surrounds the shaft and extends inwardly into the space 36 and spacers 42 are provided between the end of the hub 41 and the spacer 39. A screw 43 holds the impeller on the shaft 27.
The impeller 18 is preferably made of a material having a lower inertial mass such as plastic such as styrene modified polyphenylene oxide sold by General Electric Company under the trademark NORYL GFN-2 which includes an imperforate wall 44 spaced from the lower ~ `
15 surface 45 of the aerator housing 17 and a plurality of ~ `
spiral vanes 46 (Fig. 2). By this arrangement, the ~
edges of the vanes 46 are maintained in accurate closely `
spaced relationship to the surface 45. ;
As shown in Fig. 3, the aerator housing 17 ~ ;
comprises a plurality of radially extending arms 47 and the inlet 40 extends radially between one pair of the -arms. The supporting legs 19, 20 extend from one arm while the leg 21 extends from the opposite arm.
The aerator housing 17`is provided with an ~ -annular opening 48 providing communication between the annular space 36 and the impeller.
- .. - .. ..... . .
~O~ZZ60 In operation, when the submersible aerator 15 is in position and the motor is operating, air is drawn through the pipe 14, inlet 40 through annular space 36 and annular opening 48 and is acted upon by the impeller, the vanes acting to produce a vacuum in the space 36 so that there is no liquid or associated solids or contaminants in the space. As a result, any adverse effectson the seal and shaft parts is obviated. It should be understood that in normal sewage use, the motor is operated continuously but can be operated intermittently.
Inasmuch as the aerator housing 17 is mounted directly on the motor frame and the surfaces 34, 35 -~
position the aerator housing accurately on the motor housing, it is possible to accurately control the space ~ -between the lower surface 45 of the aerator housing and the edges of the vanes 46 so that the aerating action will be optimized.
~y mounting the motor with the free end of the shaft extending generally downwardly, oil within the -~
20 motor frame will naturally lubricate not only the bearings ~
- but provide lubrication to the mating surfaces ~etween ~ -seals 37, 38. -~
It will be apparent that a minimum number of -~ ;
parts are utilized in that the only exposed portions are 25 the motor frame, aerator housing and impeller so that ~
the submersible aerator can be readily handled and placed -. -~ - .
in position. A handle 50 can be provided on the upper -,: ~ , :, " :' ,' ',.' .~ '',.
. . .
:. , .. :, , ' . : :' ' 109Z26~
end of the motor frame to acilitate such handling. AS
a result, there is less tendency for damage to any parts in handling.
Since the cord C extends upwardly above the impeller 18, there is much less~possibility, if any, for entanglement of the cord C in the impeller 18 with the resultant damage to either the cord or the impeller.
Since the impeller is open to the liquid and there are no other mounting supports, posts or vanes 10 associated with the construction adjacent the rotating -impeller, there is less likelihood of solids causing damage to the aerator.
In the form of submersible aerator in Fig. 4, the construction is substantially identical except that the motor shaft 27' is supported by a single bearing 51 in the motor frame rather than by a pair of bearings.
A spiral groove 52 on shaft 27' functions as a pump to force oil downwardly to generate an oil film between the shaft 27' and the surface of bearing 51.
Oil returns through a passage 53.
~.' .
.
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~09;~60 Legs 19, 20, 21 extend from the aerator housing 17 to support the submersible aerator 15 near the bottom of the tank 10.
As further shown in Fig. 1, the motor 16 includes a frame comprising uppèr and lower housings 22, 23 which are bolted together as by bolts 24 and nuts 25 to produce a liquid-tight enclosure. Stator winding 26 of the motor is positioned within the frame and the shaft 27 with the rotating winding or rotor 28 thereon is mounted for rotation within the frame by bearings 29, 30. The lower end of the shaft 27 extends downwardly through a hub 31 that has a cylindrical outer surface.
The aerator housing 17 includes a cylindrical wall 32 that is telescoped over the hub 31 and a set lS screw 33 holds the aerator housing 17 on the hub 31.
The end ~4 of the wall 32 is accurately machined or molded -to engage an accurately machined or molded annular surface 35 on the lower motor housing 23 to accurately locate the aerator axially on the motor.
The interior of the annular wall 32 is spaced from the shaft 27 to define an annular space 36 surrounding a portion of the shaft 27 within the aerator housing 17. -,j.
An oil seal assembly 37, 38 and spacer 39 are provided in this area. A radial inlet 40 extends from the exterior 25 of the aerator housing 17 to the annular space 36 and -the pipe 14 is connected thereto.
,,: ':' . .~ .
~ .
-:
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The upper and lower housings 22, 23, aerator housing 17 and impeller 18 may be made of any dimensionally stable corrosion resistant material such as brass, cast iron or plastic.
The impeller 18 has a hub 41 that surrounds the shaft and extends inwardly into the space 36 and spacers 42 are provided between the end of the hub 41 and the spacer 39. A screw 43 holds the impeller on the shaft 27.
The impeller 18 is preferably made of a material having a lower inertial mass such as plastic such as styrene modified polyphenylene oxide sold by General Electric Company under the trademark NORYL GFN-2 which includes an imperforate wall 44 spaced from the lower ~ `
15 surface 45 of the aerator housing 17 and a plurality of ~ `
spiral vanes 46 (Fig. 2). By this arrangement, the ~
edges of the vanes 46 are maintained in accurate closely `
spaced relationship to the surface 45. ;
As shown in Fig. 3, the aerator housing 17 ~ ;
comprises a plurality of radially extending arms 47 and the inlet 40 extends radially between one pair of the -arms. The supporting legs 19, 20 extend from one arm while the leg 21 extends from the opposite arm.
The aerator housing 17`is provided with an ~ -annular opening 48 providing communication between the annular space 36 and the impeller.
- .. - .. ..... . .
~O~ZZ60 In operation, when the submersible aerator 15 is in position and the motor is operating, air is drawn through the pipe 14, inlet 40 through annular space 36 and annular opening 48 and is acted upon by the impeller, the vanes acting to produce a vacuum in the space 36 so that there is no liquid or associated solids or contaminants in the space. As a result, any adverse effectson the seal and shaft parts is obviated. It should be understood that in normal sewage use, the motor is operated continuously but can be operated intermittently.
Inasmuch as the aerator housing 17 is mounted directly on the motor frame and the surfaces 34, 35 -~
position the aerator housing accurately on the motor housing, it is possible to accurately control the space ~ -between the lower surface 45 of the aerator housing and the edges of the vanes 46 so that the aerating action will be optimized.
~y mounting the motor with the free end of the shaft extending generally downwardly, oil within the -~
20 motor frame will naturally lubricate not only the bearings ~
- but provide lubrication to the mating surfaces ~etween ~ -seals 37, 38. -~
It will be apparent that a minimum number of -~ ;
parts are utilized in that the only exposed portions are 25 the motor frame, aerator housing and impeller so that ~
the submersible aerator can be readily handled and placed -. -~ - .
in position. A handle 50 can be provided on the upper -,: ~ , :, " :' ,' ',.' .~ '',.
. . .
:. , .. :, , ' . : :' ' 109Z26~
end of the motor frame to acilitate such handling. AS
a result, there is less tendency for damage to any parts in handling.
Since the cord C extends upwardly above the impeller 18, there is much less~possibility, if any, for entanglement of the cord C in the impeller 18 with the resultant damage to either the cord or the impeller.
Since the impeller is open to the liquid and there are no other mounting supports, posts or vanes 10 associated with the construction adjacent the rotating -impeller, there is less likelihood of solids causing damage to the aerator.
In the form of submersible aerator in Fig. 4, the construction is substantially identical except that the motor shaft 27' is supported by a single bearing 51 in the motor frame rather than by a pair of bearings.
A spiral groove 52 on shaft 27' functions as a pump to force oil downwardly to generate an oil film between the shaft 27' and the surface of bearing 51.
Oil returns through a passage 53.
~.' .
.
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Claims
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1.
A submersible aerator comprising a motor having a liquid-tight motor housing, a starter, a rotor, and an output shaft and a seal between said motor housing and said shaft mounted on said shaft, an aerator housing mounted directly on said motor housing and surrounding a portion of said shaft, said motor and aerator housing being adapted for mounting such that the shaft of the motor extends vertically below the motor housing, said aerator housing having an annular wall and a plurality of por-tions extending radially from said annular wall, said annular wall and radially extending portions defining a lower exposed surface, an impeller mounted on the lower end of said shaft, said impeller having an imperforate wall and a plurality of vanes extending from said wall toward the lower surface of said aerator housing, said aerator housing having a cavity defining an annular space surrounding a portion of the shaft within said aerator housing adjacent said seal, said aerator housing hav-ing an annular opening in said annular wall thereof extending axially from said annular space to the lower surface of the aerator housing through which said shaft extends, said aerator housing having a generally radial passage extending from the exterior thereof to said annular space adapted to be connected such that air can be supplied from above the liquid in which the submersible aerator is positioned such that upon rotation of said impeller, air is drawn through said radial inlet to said annular space and thereafter axially through said annular opening and liquid enters said impeller from the space between said radially extending portions but liquid does not enter the area of said annular space.
2.
The combination set forth in claim 1 wherein said motor housing includes a hub on the lower end thereof, said annular wall of said aerator housing surrounding said hub, said motor and said annular wall include radially extending surfaces which abut one another to accurately locate the hub with respect to the motor housing, said impeller having a hub extending through said opening in said aerator housing.
3.
The combination set forth in claim 1 including means for mounting said motor and aerator housing com-prising a plurality of legs extending generally downwardly and outwardly from said aerator housing.
4.
A submersible aerator comprising a motor having a sealed housing, an output shaft extending from said housing, and a seal between said housing and said shaft, an aerator housing mounted on said motor housing and surrounding a portion of said shaft, an impeller mounted on the lower end of said shaft, said impeller having a plurality of vanes adjacent said aerator housing, said aerator housing having a cavity defining an annular space within said aerator housing surrounding said seal, said aerator housing having an opening extending axially from said annular space to the lower surface of the aerator housing, said aerator housing having a passage extending from the exterior thereof to said annular space such that air can be supplied from above the liquid in which the submersible aerator is positioned, said motor housing including a hub on the lower end thereof, said seal being provided between said hub and said shaft, said aerator housing including an annular wall surrounding said hub, said motor and said annular wall including radially extending surfaces which abut one another to accurately locate the hub with respect to the motor housing, such that upon rotation of said impeller, air is drawn through said inlet to said annular space and thereafter through said opening and liquid does not enter the area of said annular space.
1.
A submersible aerator comprising a motor having a liquid-tight motor housing, a starter, a rotor, and an output shaft and a seal between said motor housing and said shaft mounted on said shaft, an aerator housing mounted directly on said motor housing and surrounding a portion of said shaft, said motor and aerator housing being adapted for mounting such that the shaft of the motor extends vertically below the motor housing, said aerator housing having an annular wall and a plurality of por-tions extending radially from said annular wall, said annular wall and radially extending portions defining a lower exposed surface, an impeller mounted on the lower end of said shaft, said impeller having an imperforate wall and a plurality of vanes extending from said wall toward the lower surface of said aerator housing, said aerator housing having a cavity defining an annular space surrounding a portion of the shaft within said aerator housing adjacent said seal, said aerator housing hav-ing an annular opening in said annular wall thereof extending axially from said annular space to the lower surface of the aerator housing through which said shaft extends, said aerator housing having a generally radial passage extending from the exterior thereof to said annular space adapted to be connected such that air can be supplied from above the liquid in which the submersible aerator is positioned such that upon rotation of said impeller, air is drawn through said radial inlet to said annular space and thereafter axially through said annular opening and liquid enters said impeller from the space between said radially extending portions but liquid does not enter the area of said annular space.
2.
The combination set forth in claim 1 wherein said motor housing includes a hub on the lower end thereof, said annular wall of said aerator housing surrounding said hub, said motor and said annular wall include radially extending surfaces which abut one another to accurately locate the hub with respect to the motor housing, said impeller having a hub extending through said opening in said aerator housing.
3.
The combination set forth in claim 1 including means for mounting said motor and aerator housing com-prising a plurality of legs extending generally downwardly and outwardly from said aerator housing.
4.
A submersible aerator comprising a motor having a sealed housing, an output shaft extending from said housing, and a seal between said housing and said shaft, an aerator housing mounted on said motor housing and surrounding a portion of said shaft, an impeller mounted on the lower end of said shaft, said impeller having a plurality of vanes adjacent said aerator housing, said aerator housing having a cavity defining an annular space within said aerator housing surrounding said seal, said aerator housing having an opening extending axially from said annular space to the lower surface of the aerator housing, said aerator housing having a passage extending from the exterior thereof to said annular space such that air can be supplied from above the liquid in which the submersible aerator is positioned, said motor housing including a hub on the lower end thereof, said seal being provided between said hub and said shaft, said aerator housing including an annular wall surrounding said hub, said motor and said annular wall including radially extending surfaces which abut one another to accurately locate the hub with respect to the motor housing, such that upon rotation of said impeller, air is drawn through said inlet to said annular space and thereafter through said opening and liquid does not enter the area of said annular space.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72855476A | 1976-10-01 | 1976-10-01 | |
| US728,554 | 1976-10-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1092260A true CA1092260A (en) | 1980-12-23 |
Family
ID=24927319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA283,073A Expired CA1092260A (en) | 1976-10-01 | 1977-07-19 | Submersible aerator |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2728177A (en) |
| CA (1) | CA1092260A (en) |
| SE (1) | SE7709291L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU585654B2 (en) * | 1985-10-04 | 1989-06-22 | Aeration & Allied Technology Pty Limited | Improved conversion of septic tanks and holding wells to secondary treatment |
-
1977
- 1977-07-19 CA CA283,073A patent/CA1092260A/en not_active Expired
- 1977-07-25 AU AU27281/77A patent/AU2728177A/en active Pending
- 1977-08-17 SE SE7709291A patent/SE7709291L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| SE7709291L (en) | 1978-04-02 |
| AU2728177A (en) | 1979-02-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |