CA2182925A1 - Turbine for an underwater aerator - Google Patents
Turbine for an underwater aeratorInfo
- Publication number
- CA2182925A1 CA2182925A1 CA002182925A CA2182925A CA2182925A1 CA 2182925 A1 CA2182925 A1 CA 2182925A1 CA 002182925 A CA002182925 A CA 002182925A CA 2182925 A CA2182925 A CA 2182925A CA 2182925 A1 CA2182925 A1 CA 2182925A1
- Authority
- CA
- Canada
- Prior art keywords
- turbine
- passageways
- air
- fluid
- wall
- 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.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- 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
-
- 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
-
- 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
- C02F3/20—Activated sludge processes using diffusers
- C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
The disclosure describes a turbine for use in an underwater aerator; it comprises a cylindrical body, the upper side of which displays an annular hub and an annular recess while the lower side of which displays a circular central recessed area. A first series of air passageways traverses the body from the inner wall of the annular recess to the outer wall of the body while a second series of fluid passageways traverses the body from the central recessed area to the outer wall of the body. Each air passageway defines an exit opening which is located immediately downstream from a fluid exit opening defined by each passageway whereby during rotation, a vacuum is created drawing air into the body of water.
Description
TITLE OF THE INVENTION
Turbine for an underwater aerator.
FIELD OF THE INVENTION
The present invention relates to a turbine which is adapted to form part of an underwater aerator which is used to dissolve 10 oxygen into waste water in a tank.
BACKGROUND OF THE INVENTION
There are various types of aerators for bodies of water whereby a stream of mixed air and water is introduced beneath the surface of the water.
The treatment of waste water, such as sewage or other biodegradable materials, under pressure by air or oxygen is known to the art. Such treatment has been done, for example, by the use of a recessed vortex type impeller such as described in U.S. patent No.
4,877,532 issued October 31, 1989 to Haentjens et al. or by the use of an underwater aerator having an air diffuser rotor such as described in U.S.
patent No. 4,235,720 issued November 25, 1980 to Nakajima et al.
One presently used underwater aerator has a turbine which is formed of a cylindrical body with a center hole for connection to the rotatable drive shaft of a submerged motor. The upper side of the body is adjacent to a horizontal plate of the aerator and comprises a series of radially extending rectangular shaped recesses for the passage of air while the under side comprises a series of obliquely extending 5 elongated recesses having a semi-circular bottom for the passage of water. Both recesses are opened to their respective lower or upper sides.
It has been found that this type of turbine can not be used in tanks having an important depth. This is due to the natural 10 increase in water pressure in the vicinity of the turbine when the turbine is lowered in the tank. Indeed, additional pressure is applied against the air that is forced out, causing the potential infiltration of water at the junction between the upper side of the turbine and the horizontal plate of the aerator, therefore increasing the power requirements of the 15 submerged motor and decreasing the aeration efficiency.
OBJECT AND STATEMENT OF THE INVENTION
An object of the present invention is to provide a turbine for use in an underwater aerator which overcomes the above mentioned drawbacks of presently used turbines.
The present invention therefore pertains to turbine which comprises:
a cylindrical body having a center hole for connection to a rotatable drive shaft, the body defining an upper side, a lower side and an outer peripheral wall; the upper side displaying an annular hub portion concentric with the center hole and an annular recess surrounding the hub portion; the lower side displaying a circular central recessed area;
a first series of air passageways traversing the body from the inner wall of the annular recess to the outer wall of the body; and a second series of fluid passageways traversing the body from the central recessed area to the outer wall of the body; each air passageway of the first series of passageways defining an air exit opening, at the outer peripheral wall of the body, which is adjacent to a fluid opening exit defined for each passageway of the second series of passageways at the outer peripheral wall; each air exit opening being located immediately downstream of an adjacent fluid exit opening in relation to the rotational direction of the body when rotatably driven by the drive shaft.
In one form of the invention, it has been found that effective aeration is obtained if the fluid passageways have an axis at about 10~ with respect to the radius of the cylindrical body.
Similarly, it has been found that effective aeration is obtained if the air p~ss~geway extends at an angle of about 15~ with the radius of the body.
In a preferred form of the invention, it has been found that a diameter ratio of 3:1 between the fluid passageway to the air passageway provides again effective aeration of the waste water.
In another preferred form of the present invention, the fluid passageways each define a generally slanted U-shaped channel open to the lower side of the cylindrical body.
Other objects and further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. It should be understood, however, that this detailed description, while indicating preferred embodiments of the invention, is given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic elevation view of an aerator to be used underwater in a tank and using a turbine made in accordance with a first embodiment of the present invention;
Figure 2 is a top perspective view of a turbine according to a first embodiment of the present invention;
Figure 3 is a top plan view thereof with sections broken away;
Figure 4 is a bottom perspective view of the turbine of figure 2;
Figure 5 is a cross sectional view thereof taken along lines 5-5 of figure 2;
Figure 6 is a cross sectional view thereof taken along 5 lines 6-6 of figure 2;
Figure 7 is a bottom perspective view of a turbine according to a second embodiment of the present invention;
Figure 8 is a bottom plan view of the turbine of figure 7;
Figure 9 is a side elevational view of the turbine of figure 7;
Figure 10 is a top plan view, partly in section, of the turbine of figure 7; and - Figure 11 is a cross sectional view taken along lines 11-11 of figure 10.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to figure 1, there is shown an aerator, 25 generally denoted 10, which is adapted to be placed underwater in a storage tank (not shown) containing water to be treated.
The aerator comprises a base 12 having legs 14 for resting on a bottom wall of the storage tank, a casing 16 hermetically enclosing a motor 18. The casing rests on a support housing 20 through which extends the drive axle 22 of the motor. The support housing 20 5 defines an enclosed chamber 24 which is in air flow connection with an air pipe 26 which is opened to air from the outside. To the base 12 is connected a circumferential arrangement of elongated tubular guide ducks 28 both ends of which are opened. Preferably, the cross section of these guide ducks are rectangular or square shape.
A turbine, generally denoted 30, is mounted to the motor drive axle 22 by means of a shaft 32.
Referring to figures 2 and 4, the turbine 30 defines a 15 cylindrical body which has an upper side 34, an outer peripheral wall 36 and an under side 38. The upper side 34 contacts a plate 35 of the aerator 10 (see Figure 1).
As shown in figure 2, the upper side 34 of the cylindrical 20 body displays a center hole 40 for connection to the drive shaft 32 and an annular hub 42. The under side also displays an annular planar face 44 and an annular recess 46 which is defined by the outer peripheral wall 48 of the hub, an annular base 49 and the inner wall 50.
As shown in figure 4, the under side 38 displays a frusto conical face 52 with a central recessed area 54, the latter being deflned by an annular base 54 and an inner peripheral wall 56.
Referring now to figures 3, 5 and 6, the cylindrical body 30 defines a first series of passageways 60, eight passageways being displayed in the present embodiment as cylindrical channels 60a to 60h.
As can be seen in figure 5, these passageways are inclined, extending parallel to face 38 from the inner wall 56 to the outer peripheral wall 36 of the body. In figure 3, a line 62 has been drawn to show the radius of the centrical body while line 64 represents the axis of the cylindrical channel 60a. Lines 62 and 64 intersect at an angle a which is about 10~. Hence, the p~ss~geways 60 extend tangentially rather than radially with respect to the center hole 40.
Referring now to figures 3 and 6, the cylindrical body 30 also includes a second series of passageways 66; in the embodiment illustrated, there are eight passageways 66a to 66h corresponding in number to the passageways 60. These passageways are inclined cylindrical channels which traverse the body from the outer peripheral wall 36 to the inner wall 50 of the annular recess. In figure 3, a line 67 has been drawn to show the radius of the cylindrical body while a line 68 represents the axis of the cylindrical channel 66h. Lines 67 and 68 intersect at an angle ~ which is about 15~. Also illustrated in figure 3, passageways 60a-60h and 66a-66h are arranged in pairs, the smaller passageway 66 crossing over the larger passageway 60. In one preferred form of the invention, the ration of the diameter of the passageways 60 to the diameter of the passageways 66 is 3:1.
Each passageway 66 terminates at the peripheral wall 36 immediately adjacent the opening of a corresponding passageway 60.
If the rotational direction of the cylindrical body is that indicated by arrow 70 in figure 2, the location of the opening of each passageway 66 is said to be downstream of the opening of its associated passageway 60.
The operation of the turbine will now be described in 5 relation to figure 1.
It will be assumed that the entire aerator 10 of figure 1 is immerged in fluid to be treated of a storage tank, with the exception that the upper outlet of the water pipe 26 is opened to the atmosphere.
Driving motor 18 will cause fluid present in passageways 60 and 66 to flow outwardly towards and exit at the peripheral wall 36. The outlet of water from the p~ss~geways 66 causes a vacuum forcing air to enter the pipe 26, flowing through chamber 24 and into the annular recessed area 46 of the upper side of the turbine and through the various passageways 15 66. The air exiting the passageways 66 mixes with the water exiting the passageways 60. The bubbles (not shown) created by this action will flow through the circumferentially spaced guide ducks 28 so that aeration is adequately distributed over the bottom of the tank. By having the tubular ducks presenting a rectangular cross section adjacent the 20 openings 60 the combination of several bubbles into a larger bubble is limited.
As will be easily understood by one of ordinary skills in the art, since the upper side 34 of the turbine 30 according to an 25 embodiment of the present invention is essentially flat, it may efficiently contact the horizontal plate 35 of the aerator 10. Therefore, when the aerator 10 including the turbine 30 of the present invention is immerged in a tank (not shown), the water pressure, which increases with the aerator depth, does not cause water illrilll~lion between the upper side of the turbine 30 and the plate 35 of the aerator 10. Furthermore, the vacuum created in the vicinity of the air passageways 66a-66h by the fluid passageways 60a-60h allow the aerator 10 to be immerged deeper in a 5 waste tank since a greater water pressure is required to overcome the vacuum and enter the air passageways.
Referring now to figures 7-11, a second embodiment of a turbine 100 adapted to be installed to the motor drive axle 22 by means 10 of a shaft 32 (see Figure 1), will be described.
The turbine 100 is similar to the turbine 30 and thus, only differences between these two turbines will be described.
One major difference between the turbine 100 and the turbine 30 of Figures 2-6 is that the turbine 100 has fluid passageways 160a-160h that are opened to an underside 138. As can be better seen from Figures 9 and 11, the fluid passageways 160a-160h display an essentially slanted U-shaped cross section.
The fluid passageways 160a-160h each define an arc of circle joining a central recessed area 154 and an outer peripheral wall 136.
As can be better seen from Figure 9 and 11, each fluid passageway 160a-160h includes a leading edge 172 and a trailing edge 174. The determination of the leading and trailing edges is made with respect to the direction of rotation of the turbine 100 (see arrow 170).
The leading edge 172 of each fluid passageway 160a-160h includes a bevelled portion 176 which increases the amount of fluid flowing outwardly in each fluid passageway 160a-160h, towards the peripheral wall 136 by providing a positive height difference between the trailing edge 174 and the leading edge 172.
Another difference between the turbine 100 and the turbine 30 of figures 2-6 is that turbine 100 includes air passageways 166a-166h which traverse the cylindrical body radially.
The other characteristics of the turbine 100 are substantially the same as that of turbine 30 of figures 2-6. However, it is to be noted that the operational direction of rotation (see arrow 70 in Figure 2) of turbine 30 is the opposite of the operational direction of rotation (see arrow 170 in Figures 8 and 9) of turbine 100.
Although the invention has been described above with respect to two specific forms, it will be evident to a person skilled in the art that these forms may be modified and refined in various ways. It is 20 therefore wished to have it understood that the present invention should not be limited in scope, except by the terms of the following claims.
Turbine for an underwater aerator.
FIELD OF THE INVENTION
The present invention relates to a turbine which is adapted to form part of an underwater aerator which is used to dissolve 10 oxygen into waste water in a tank.
BACKGROUND OF THE INVENTION
There are various types of aerators for bodies of water whereby a stream of mixed air and water is introduced beneath the surface of the water.
The treatment of waste water, such as sewage or other biodegradable materials, under pressure by air or oxygen is known to the art. Such treatment has been done, for example, by the use of a recessed vortex type impeller such as described in U.S. patent No.
4,877,532 issued October 31, 1989 to Haentjens et al. or by the use of an underwater aerator having an air diffuser rotor such as described in U.S.
patent No. 4,235,720 issued November 25, 1980 to Nakajima et al.
One presently used underwater aerator has a turbine which is formed of a cylindrical body with a center hole for connection to the rotatable drive shaft of a submerged motor. The upper side of the body is adjacent to a horizontal plate of the aerator and comprises a series of radially extending rectangular shaped recesses for the passage of air while the under side comprises a series of obliquely extending 5 elongated recesses having a semi-circular bottom for the passage of water. Both recesses are opened to their respective lower or upper sides.
It has been found that this type of turbine can not be used in tanks having an important depth. This is due to the natural 10 increase in water pressure in the vicinity of the turbine when the turbine is lowered in the tank. Indeed, additional pressure is applied against the air that is forced out, causing the potential infiltration of water at the junction between the upper side of the turbine and the horizontal plate of the aerator, therefore increasing the power requirements of the 15 submerged motor and decreasing the aeration efficiency.
OBJECT AND STATEMENT OF THE INVENTION
An object of the present invention is to provide a turbine for use in an underwater aerator which overcomes the above mentioned drawbacks of presently used turbines.
The present invention therefore pertains to turbine which comprises:
a cylindrical body having a center hole for connection to a rotatable drive shaft, the body defining an upper side, a lower side and an outer peripheral wall; the upper side displaying an annular hub portion concentric with the center hole and an annular recess surrounding the hub portion; the lower side displaying a circular central recessed area;
a first series of air passageways traversing the body from the inner wall of the annular recess to the outer wall of the body; and a second series of fluid passageways traversing the body from the central recessed area to the outer wall of the body; each air passageway of the first series of passageways defining an air exit opening, at the outer peripheral wall of the body, which is adjacent to a fluid opening exit defined for each passageway of the second series of passageways at the outer peripheral wall; each air exit opening being located immediately downstream of an adjacent fluid exit opening in relation to the rotational direction of the body when rotatably driven by the drive shaft.
In one form of the invention, it has been found that effective aeration is obtained if the fluid passageways have an axis at about 10~ with respect to the radius of the cylindrical body.
Similarly, it has been found that effective aeration is obtained if the air p~ss~geway extends at an angle of about 15~ with the radius of the body.
In a preferred form of the invention, it has been found that a diameter ratio of 3:1 between the fluid passageway to the air passageway provides again effective aeration of the waste water.
In another preferred form of the present invention, the fluid passageways each define a generally slanted U-shaped channel open to the lower side of the cylindrical body.
Other objects and further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. It should be understood, however, that this detailed description, while indicating preferred embodiments of the invention, is given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic elevation view of an aerator to be used underwater in a tank and using a turbine made in accordance with a first embodiment of the present invention;
Figure 2 is a top perspective view of a turbine according to a first embodiment of the present invention;
Figure 3 is a top plan view thereof with sections broken away;
Figure 4 is a bottom perspective view of the turbine of figure 2;
Figure 5 is a cross sectional view thereof taken along lines 5-5 of figure 2;
Figure 6 is a cross sectional view thereof taken along 5 lines 6-6 of figure 2;
Figure 7 is a bottom perspective view of a turbine according to a second embodiment of the present invention;
Figure 8 is a bottom plan view of the turbine of figure 7;
Figure 9 is a side elevational view of the turbine of figure 7;
Figure 10 is a top plan view, partly in section, of the turbine of figure 7; and - Figure 11 is a cross sectional view taken along lines 11-11 of figure 10.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to figure 1, there is shown an aerator, 25 generally denoted 10, which is adapted to be placed underwater in a storage tank (not shown) containing water to be treated.
The aerator comprises a base 12 having legs 14 for resting on a bottom wall of the storage tank, a casing 16 hermetically enclosing a motor 18. The casing rests on a support housing 20 through which extends the drive axle 22 of the motor. The support housing 20 5 defines an enclosed chamber 24 which is in air flow connection with an air pipe 26 which is opened to air from the outside. To the base 12 is connected a circumferential arrangement of elongated tubular guide ducks 28 both ends of which are opened. Preferably, the cross section of these guide ducks are rectangular or square shape.
A turbine, generally denoted 30, is mounted to the motor drive axle 22 by means of a shaft 32.
Referring to figures 2 and 4, the turbine 30 defines a 15 cylindrical body which has an upper side 34, an outer peripheral wall 36 and an under side 38. The upper side 34 contacts a plate 35 of the aerator 10 (see Figure 1).
As shown in figure 2, the upper side 34 of the cylindrical 20 body displays a center hole 40 for connection to the drive shaft 32 and an annular hub 42. The under side also displays an annular planar face 44 and an annular recess 46 which is defined by the outer peripheral wall 48 of the hub, an annular base 49 and the inner wall 50.
As shown in figure 4, the under side 38 displays a frusto conical face 52 with a central recessed area 54, the latter being deflned by an annular base 54 and an inner peripheral wall 56.
Referring now to figures 3, 5 and 6, the cylindrical body 30 defines a first series of passageways 60, eight passageways being displayed in the present embodiment as cylindrical channels 60a to 60h.
As can be seen in figure 5, these passageways are inclined, extending parallel to face 38 from the inner wall 56 to the outer peripheral wall 36 of the body. In figure 3, a line 62 has been drawn to show the radius of the centrical body while line 64 represents the axis of the cylindrical channel 60a. Lines 62 and 64 intersect at an angle a which is about 10~. Hence, the p~ss~geways 60 extend tangentially rather than radially with respect to the center hole 40.
Referring now to figures 3 and 6, the cylindrical body 30 also includes a second series of passageways 66; in the embodiment illustrated, there are eight passageways 66a to 66h corresponding in number to the passageways 60. These passageways are inclined cylindrical channels which traverse the body from the outer peripheral wall 36 to the inner wall 50 of the annular recess. In figure 3, a line 67 has been drawn to show the radius of the cylindrical body while a line 68 represents the axis of the cylindrical channel 66h. Lines 67 and 68 intersect at an angle ~ which is about 15~. Also illustrated in figure 3, passageways 60a-60h and 66a-66h are arranged in pairs, the smaller passageway 66 crossing over the larger passageway 60. In one preferred form of the invention, the ration of the diameter of the passageways 60 to the diameter of the passageways 66 is 3:1.
Each passageway 66 terminates at the peripheral wall 36 immediately adjacent the opening of a corresponding passageway 60.
If the rotational direction of the cylindrical body is that indicated by arrow 70 in figure 2, the location of the opening of each passageway 66 is said to be downstream of the opening of its associated passageway 60.
The operation of the turbine will now be described in 5 relation to figure 1.
It will be assumed that the entire aerator 10 of figure 1 is immerged in fluid to be treated of a storage tank, with the exception that the upper outlet of the water pipe 26 is opened to the atmosphere.
Driving motor 18 will cause fluid present in passageways 60 and 66 to flow outwardly towards and exit at the peripheral wall 36. The outlet of water from the p~ss~geways 66 causes a vacuum forcing air to enter the pipe 26, flowing through chamber 24 and into the annular recessed area 46 of the upper side of the turbine and through the various passageways 15 66. The air exiting the passageways 66 mixes with the water exiting the passageways 60. The bubbles (not shown) created by this action will flow through the circumferentially spaced guide ducks 28 so that aeration is adequately distributed over the bottom of the tank. By having the tubular ducks presenting a rectangular cross section adjacent the 20 openings 60 the combination of several bubbles into a larger bubble is limited.
As will be easily understood by one of ordinary skills in the art, since the upper side 34 of the turbine 30 according to an 25 embodiment of the present invention is essentially flat, it may efficiently contact the horizontal plate 35 of the aerator 10. Therefore, when the aerator 10 including the turbine 30 of the present invention is immerged in a tank (not shown), the water pressure, which increases with the aerator depth, does not cause water illrilll~lion between the upper side of the turbine 30 and the plate 35 of the aerator 10. Furthermore, the vacuum created in the vicinity of the air passageways 66a-66h by the fluid passageways 60a-60h allow the aerator 10 to be immerged deeper in a 5 waste tank since a greater water pressure is required to overcome the vacuum and enter the air passageways.
Referring now to figures 7-11, a second embodiment of a turbine 100 adapted to be installed to the motor drive axle 22 by means 10 of a shaft 32 (see Figure 1), will be described.
The turbine 100 is similar to the turbine 30 and thus, only differences between these two turbines will be described.
One major difference between the turbine 100 and the turbine 30 of Figures 2-6 is that the turbine 100 has fluid passageways 160a-160h that are opened to an underside 138. As can be better seen from Figures 9 and 11, the fluid passageways 160a-160h display an essentially slanted U-shaped cross section.
The fluid passageways 160a-160h each define an arc of circle joining a central recessed area 154 and an outer peripheral wall 136.
As can be better seen from Figure 9 and 11, each fluid passageway 160a-160h includes a leading edge 172 and a trailing edge 174. The determination of the leading and trailing edges is made with respect to the direction of rotation of the turbine 100 (see arrow 170).
The leading edge 172 of each fluid passageway 160a-160h includes a bevelled portion 176 which increases the amount of fluid flowing outwardly in each fluid passageway 160a-160h, towards the peripheral wall 136 by providing a positive height difference between the trailing edge 174 and the leading edge 172.
Another difference between the turbine 100 and the turbine 30 of figures 2-6 is that turbine 100 includes air passageways 166a-166h which traverse the cylindrical body radially.
The other characteristics of the turbine 100 are substantially the same as that of turbine 30 of figures 2-6. However, it is to be noted that the operational direction of rotation (see arrow 70 in Figure 2) of turbine 30 is the opposite of the operational direction of rotation (see arrow 170 in Figures 8 and 9) of turbine 100.
Although the invention has been described above with respect to two specific forms, it will be evident to a person skilled in the art that these forms may be modified and refined in various ways. It is 20 therefore wished to have it understood that the present invention should not be limited in scope, except by the terms of the following claims.
Claims (18)
1. A turbine for use in an underwater aerator comprising:
a cylindrical body having a center hole for connection to a rotatable drive shaft, said body defining an upper side, a lower side and an outer peripheral wall; said upper side displaying an annular hub portion concentric with said center hole and an annular recess surrounding said hub portion; said recess displaying an inner wall; said lower side displaying a circular central recessed area;
a first series of air passageways traversing said body from said inner wall of said annular recess to said outer wall of said body;
and a second series of fluid passageways traversing said body from said central recessed area to said outer wall of said body; each said air passageway of said first series of passageways defining an air exit opening at said outer peripheral wall of said body, which is adjacent to a fluid opening exit defined for each passageway of said second series of passageways at said outer peripheral wall; each said air exit opening being located immediately downstream of an adjacent fluid exit opening in relation to the rotational direction of the body when rotatably driven by said drive shaft.
a cylindrical body having a center hole for connection to a rotatable drive shaft, said body defining an upper side, a lower side and an outer peripheral wall; said upper side displaying an annular hub portion concentric with said center hole and an annular recess surrounding said hub portion; said recess displaying an inner wall; said lower side displaying a circular central recessed area;
a first series of air passageways traversing said body from said inner wall of said annular recess to said outer wall of said body;
and a second series of fluid passageways traversing said body from said central recessed area to said outer wall of said body; each said air passageway of said first series of passageways defining an air exit opening at said outer peripheral wall of said body, which is adjacent to a fluid opening exit defined for each passageway of said second series of passageways at said outer peripheral wall; each said air exit opening being located immediately downstream of an adjacent fluid exit opening in relation to the rotational direction of the body when rotatably driven by said drive shaft.
2. A turbine as defined in claim 1, wherein said circular central recessed area displaying an inner peripheral wall; said second series of fluid passageways traversing said body from said inner peripheral wall of said circular central recessed area.
3. A turbine as defined in claim 2, wherein said fluid passageways each define a cylindrical channel having an axis which extends obliquely with respect to the radius of said cylindrical body.
4. A turbine as defined in claim 3, wherein said axis of said fluid passageways extends at an angle of about 10~ with respect to said radius.
5. A turbine as defined in claim 4, wherein said air passageways each define a cylindrical channel having an axis which extends obliquely relative to the radius of said cylindrical body.
6. A turbine as defined in claim 5, wherein said axis of said air passageways extends at an angle of about 15~ with respect to said radius.
7. A turbine as defined in claim 6, wherein the channel of each said air passageway crosses over the channel of an adjacent fluid passageway.
8. A turbine as defined in claim 7, wherein the ratio of the diameter of the channel of said fluid passageway to the diameter of said channel of said air passageway is about 3:1.
9. A turbine as defined in claim 1, wherein said fluid passageways each define a substantially slanted U-shaped channel open to said lower side of said cylindrical body.
10. A turbine as defined in claim 9, wherein each said slanted U-shaped channel has a leading edge and a trailing edge in relation to the rotational direction of the body when rotatably driven by said drive shaft; said leading edge being bevelled.
11. A turbine as defined in claim 10, wherein said fluid passageways each define an arc of circle from said central recessed area to said outer peripheral wall.
12. A turbine as defined in claim 11, wherein said air passageways each define a cylindrical channel having an axis which extends essentially radially from said inner wall of said annular recess.
13. A turbine as defined in claim 12, wherein the channel of each said air passageways crosses over the channel of an adjacent fluid passageways.
14. A turbine as defined in claim 13, wherein the cross-sectional surface of said cylindrical channel of each said air passageway is substantially smaller than the cross-sectional surface of said U-shaped channel of each said fluid passageway.
15. An underwater aerator comprising:
a base adapted to be located at the bottom of a waste water purification tank;
a plurality of water guide ducks mounted to said base and extending outwardly in a circumferential arrangement relative to said base;
a driving unit having a rotatable drive shaft;
a cylindrical body having a center hole for connection to said rotatable drive shaft; said body defining an upper side, a lower side and an outer peripheral wall; said upper side displaying an annular hub portion concentric with said center hole and an annular recess surrounding said hub portion; said recessed displaying an inner wall; said lower side displaying a circular central recessed area;
a first series of air passageways traversing said body from said inner wall of said annular recess to said outer wall of said body;
and a second series of fluid passageways traversing said body from said central recessed area to the outer wall of said body; each said air passageway of said first series of passageways defining an air exit opening at said outer peripheral wall of said body, which is adjacent to a fluid exit opening defined for each fluid passageway of said second series of passageways at said outer peripheral wall; each said air exit opening being located immediately downstream of an adjacent fluid exit opening in relation to the rotational direction of the body when rotatably driven by said drive shaft.
a base adapted to be located at the bottom of a waste water purification tank;
a plurality of water guide ducks mounted to said base and extending outwardly in a circumferential arrangement relative to said base;
a driving unit having a rotatable drive shaft;
a cylindrical body having a center hole for connection to said rotatable drive shaft; said body defining an upper side, a lower side and an outer peripheral wall; said upper side displaying an annular hub portion concentric with said center hole and an annular recess surrounding said hub portion; said recessed displaying an inner wall; said lower side displaying a circular central recessed area;
a first series of air passageways traversing said body from said inner wall of said annular recess to said outer wall of said body;
and a second series of fluid passageways traversing said body from said central recessed area to the outer wall of said body; each said air passageway of said first series of passageways defining an air exit opening at said outer peripheral wall of said body, which is adjacent to a fluid exit opening defined for each fluid passageway of said second series of passageways at said outer peripheral wall; each said air exit opening being located immediately downstream of an adjacent fluid exit opening in relation to the rotational direction of the body when rotatably driven by said drive shaft.
16. An underwater aerator as defined in claim 15, wherein said water guide ducks are elongated tubular members extending in a common horizontal plane.
17. An underwater aerator as defined in claim 16, wherein said ducks have a rectangular cross section.
18. An underwater aerator as defined in claim 16, wherein said plurality of guide ducks corresponds in number to said series of fluid passageways.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002182925A CA2182925A1 (en) | 1996-08-08 | 1996-08-08 | Turbine for an underwater aerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002182925A CA2182925A1 (en) | 1996-08-08 | 1996-08-08 | Turbine for an underwater aerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2182925A1 true CA2182925A1 (en) | 1998-02-09 |
Family
ID=4158712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002182925A Abandoned CA2182925A1 (en) | 1996-08-08 | 1996-08-08 | Turbine for an underwater aerator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2182925A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745681A (en) * | 2016-12-20 | 2017-05-31 | 蓝深集团股份有限公司 | submersible aerator with cutting function |
-
1996
- 1996-08-08 CA CA002182925A patent/CA2182925A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745681A (en) * | 2016-12-20 | 2017-05-31 | 蓝深集团股份有限公司 | submersible aerator with cutting function |
| CN106745681B (en) * | 2016-12-20 | 2023-05-09 | 蓝深集团股份有限公司 | Submersible aerator with cutting function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4681711A (en) | Method and apparatus for aeration of wastewater lagoons | |
| CA1101138A (en) | Aerator | |
| EP0853594B1 (en) | Submersible mixing impeller | |
| US4938899A (en) | Gas diffusion system | |
| US5156778A (en) | Mixing device | |
| JPH07155786A (en) | Device for selective aeration or anaerobic liquid stirring | |
| TWI832932B (en) | Device for aerating bodies of water | |
| US6308834B1 (en) | Flotation tank impeller | |
| JP3160057B2 (en) | Stirring aeration device | |
| US4313898A (en) | Radial injector for aspiration of gases | |
| FI81077B (en) | LUFTNINGSANORDNING FOER AVFALLSVATTEN FRAON INDUSTRI OCH BEBYGGELSE. | |
| KR20010015571A (en) | Improved mixing and aerating apparatus | |
| US5762833A (en) | Aerator with a removable stator and method of repairing the same | |
| CA2182925A1 (en) | Turbine for an underwater aerator | |
| SU1625330A3 (en) | Apparatus for aerating liquids | |
| EP0027911B1 (en) | Apparatus for contacting liquid with a gas | |
| US3473790A (en) | Aeration apparatus | |
| CA2663861C (en) | Apparatus for distribution of a gas into a body of liquid | |
| US20060087047A1 (en) | Fluid mixing apparatus | |
| JP3203336B2 (en) | Underwater stirrer | |
| JP2000084382A (en) | Air diffusion and stirring device | |
| CA1056964A (en) | Apparatus for mixing a liquid with a gas in a vessel | |
| JPH0111359Y2 (en) | ||
| CA2232581C (en) | Submersible mixing impeller | |
| AU614630B2 (en) | A jet ring for mixers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |