CA1183972A - Self-propelled rotating aerator - Google Patents
Self-propelled rotating aeratorInfo
- Publication number
- CA1183972A CA1183972A CA000415859A CA415859A CA1183972A CA 1183972 A CA1183972 A CA 1183972A CA 000415859 A CA000415859 A CA 000415859A CA 415859 A CA415859 A CA 415859A CA 1183972 A CA1183972 A CA 1183972A
- Authority
- CA
- Canada
- Prior art keywords
- pipes
- pipe
- baffle
- air
- enclosure
- 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
-
- 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
-
- 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
-
- 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
- B01F23/2336—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 location of the place of introduction of the gas relative to the stirrer
- B01F23/23364—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 location of the place of introduction of the gas relative to the stirrer the gas being introduced between the stirrer elements
- B01F23/233642—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 location of the place of introduction of the gas relative to the stirrer the gas being introduced between the stirrer elements at the stirrer elements
-
- 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
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
- B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
- B01F25/212—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers the injectors being movable, e.g. rotating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/32—Driving arrangements
- B01F35/32005—Type of drive
- B01F35/3203—Gas driven
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/32—Driving arrangements
- B01F35/32005—Type of drive
- B01F35/32015—Flow driven
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth 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)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
SELF-PROPELLED ROTATING AERATOR
ABSTRACT OF THE DISCLOSURE
A substantially horizontally located pipe or arm extends upon each side of a central support which is mounted for rotation upon a vertical stationary spindle extending upwardly from the base of a liquid holding enclosure. A
pair of arcuately curved baffles are supported upon the pipe or arms in spaced relationship one from the other and compressed air is fed through a plurality of apertures or the like formed through the wall of the pipe and directed substantially horizontally. This air is entrained in the liquid and the baffles guide the flow created by the dif-ference in specific gravity of the liquid with the entrain-ed air and the liquid alone thus causing the device to ro-tate in a direction governed by the curvature of the baffles or vanes.
ABSTRACT OF THE DISCLOSURE
A substantially horizontally located pipe or arm extends upon each side of a central support which is mounted for rotation upon a vertical stationary spindle extending upwardly from the base of a liquid holding enclosure. A
pair of arcuately curved baffles are supported upon the pipe or arms in spaced relationship one from the other and compressed air is fed through a plurality of apertures or the like formed through the wall of the pipe and directed substantially horizontally. This air is entrained in the liquid and the baffles guide the flow created by the dif-ference in specific gravity of the liquid with the entrain-ed air and the liquid alone thus causing the device to ro-tate in a direction governed by the curvature of the baffles or vanes.
Description
SELF-PROPELLED ROTATING AERATOR
BACKGROUND OF THE INVE _IO
This invention relates to new and useful improvemen-ts in devices for aerating liquid in a circular tank for me-chanically mixing the liquid and scouring deposi-ts from the base of the tank.
Although it is primarily designed for the treatment of sewage, nevertheless it will be appreciated that it can be used with any other process in which a liquid requires aeration and mixing.
Conventionally, when compressed air is used for aera-tion the point a-t which bubbles are emitted is stationary and currents are used for mixing, or mechanical means are provided to rotate devices to improve aeration and mixing.
Such devices that require a separate source of power to cause rotation are by nature more complex to maintain, which is considered a disadvantage.
SUMMARY OF THE INVENTION
The present device overcomes these disadvantages by providing a device whi.ch aerates and mixes a liquid with the use of compressed air only, i-t being understood that the device is rotated no-t by the expulsion of je-t action of the compressed air from the arms but by utilizing the b~
~lw ~ t7~
change in specific gravi-ty oE the liquid when entrained with air, to provide a forward moment to the assembly so that it rotates due to this difference in specific gravi ties reacting against a curved baffle or vane.
The principal object and essence of the invention is to provide a device of the character herewithin des-cribed in which one or more arms is rotated by the release of air through the arm, into the liquid and utilizing the difference in specific gravity of the aerated liquid to provide the rotation to the air dis-tributing arm or armsO
Another object of the invention is to provide a device of the character herewithin described in which the only source of power is a source of compressed air.
Another object of the invention is to provide a device of -the character herewithin described which provides a self scouring action to the base of the enclosure without contact of the rotating component with the base.
A yet further object of the invention is to provide a device of the character herewithin described which pro-vides complete aeration and mixing of any bottom deposits due -to the scouring action at the entrance of the liquid between baf:Eles supported by the aeration pipes or arms.
Yet another object of the invention is to provide a device of the character herewithin described which provides a longer retention of air bubbles in the tank or enclosure than of other devices that discharge similar bubbles of the same size in the same depth of tank.
A ye-t further object of the invention is to provide a device of the charac-ter herewithin described in which -the only relative movement between any mechanical parts in the liquid enclosure is between the supporting post and a rota-table sleeve upon which the arms or pipes are supported.
A still further object of the invention is to provide a device of the character herewithin described which is sim-ple in construc-tion, economical in manufacture and o-therwise well suited to the purpose for which it is designed.
With the foregoing in view, and other advantages as will become apparent to those skilled in the art to which this invention relates as this specification proceeds, the invention is herein described by reference to the accompany-ing drawings forming a part hereof, which includes a des-cription of -the best mode known to the applicant and of the preferred typical embodiment of the principles of the present invention, in which:
DESCRIPTION OF THE DRAWINGS
.
Figure 1 is a cross section of a liquid carrying enclosure with the device installed therein.
Fig~re 2 is a fragmentary top plan view of Figure 1 3~
with the baffles removed for clarity.
Figure 3 is a cross sectional view of one of the pipes showing the baffles supported thereon.
Figure 4 is a schematic view illustrating the for-ces on the baffle at a specific point thereon.
Figure 4A is a triangle of forces resolved from Figure 4.
In the drawings like characters of reference indi-cate corresponding parts in the differen-t figures.
PRELIMINARY DESCRIPTION
Before proceeding with the description of -this inven-tion, it should be noted that the terms "aeration" and "compressed air" are used both in the specification and claims and although in the majority of instances, air will be used as the gas, nevertheless it must be understood that other gases could be used depending upon circumstances and in the attached claims, the terms "air" and "aeration" are presumed to include any other gases which may be utilized without affecting the scope of this invention.
DETAILED DESCR:[PTION
Proceeding therefore to describe the invention in detail, reference should be made to the drawings in which 10 illustrates a liquid enclosure such as a sewage tank which includes a vertically situated substantially cylin-drical wall 11 and a subs-tantially horizontal base 12.
A centrally located we:Ll 13 is formed within the base as illustra-ted in Figure 1 and a fixed vertically situated post 14 extends downwardly through this well and into the concrete or soil below the enclosure so -that the post is rigidly supported in the central vertical loca-tion.
Furthermore, a compressed air supply line 15 ex-tends from a source of compressed air shown schematically by reference character 16 and extends upwardly into the well 13 as will hereinaf-ter be described.
The aerator assembly collectively designated 17 is journalled for rotation upon the post 14 and in this embo-diment includes a pair of diametrically situated pipes 18 secured by the inner ends thereof to a shouldered cylin-drical portion 19 which in turn is secured to the lower end of a cylindrical sleeve 20.
A lower bearing assembly 21 is provided adjacen-t the lower end of the sleeve 20 and an upper bearing assem-bly 22 is provided adjacent -the upper end of the sleeve 20 toge-ther wi.-th a thrust bearing assembly 23.
The sleeve engages over -the Eixed post 14 wi-th the bear.ing assemblies 21, 22 and 23 rnoun-ting -the sleeve and the pi.pes 1~, for rotation within the enclosure 10 so that ~ 3 ~ ~
the pipes can rotate in a horizontal plane spaced just above the base 12 of the enclosure. Where the size of the tank and other factors make it economical, the fixed shaft supporting the bearings rnay be hlmg from a bridge or the like.
Air discharge means are provided within the pipes 18 and take the form, in this embodiment, of a plurality of relatively small apertures or drillings 24 formed through the wall of the pipes and directing compressed air outwardly in a substantially horizontal plane with the holes in one pipe 18 being on the opposite side there-of to the holes in the opposite pipe 18, as clearly shown in the drawings.
In the present drawings, no supports are shown between the outer ends of the pipes 18 and the central cylindrical sleeve 20, but if these pipes are of a con-siderable length, then obviously some form of support will be required. This support may take the Eorm of guy wires extending between the outer ends of the pipes 18 and the cylindrical sleeve 20 but as such support means are well known, it is not believed necessary to illus-trate or describe same Eurther.
A first baEfle 25 is secured to each oE the plpes 18 by we]ding or the like and this baffle is ar-cuately curved and extends upwardly and rearwardly rela--tlve to the direction of travel 26 as clearly illustra-ted in the cross sectional view of Figure 3.
3~
A second baffle 27 is also provided and is arcua-tely curved and is supported from the pipe 18 by means of struts 28 extending between the second baffle 27 and the pipe 18 and also between the second baffle 27 and the first baffle It will be observed that the second baffle is arcua-tely curved with substantially the same curvature as the first baffle 25 and that i-t is supported in spaced and sub-stantially parallel relationship with the first baffle 25.
E~owever, i-t will be observed tha-t the trailing side 2~ of the second baffle 27 extends considerably beyond the trail-ing edge 30 of the first baffle. Once again this is shown clearly in Figure 3.
The lower end or side 31 oE the second baffle 27 is enlarged slightly with a pear drop cross sectional construc-tion to assist in the movement of this baffle through the liquid as will hereinafter be described and it will also be observed that the first baffle 25 is wider at the base thereof than at the trailing edge 30 in order -to give sup-port to this baffle where it is attached -to the pipe 18.
An air in take component 32 is provided below the con-nection of the pipes 18 to the portion 19 o:f the assembly, said component being substantially cylind:rical and open based as illustrated by reference character 33. This cy-~3~
lind.rical component communicates with the interior of the pipes 18 and the lower open side 33 is situated spaced be-low the plane of the discharge apertures 24 within the pipes 18.
It will also be noted that the discharge end 34 of the compressed air supply line 15 engages through the open base 33 of the cylindrical component 32 and termina-tes with-in this cylindrical component, but once again, spaced below the plane of the apertures 24 within the pipes 18.
In operation, and with the enclosure fi.lled with liquid, the lower open portion or sleeve component 32 will be filled with liquid together with the pipes 18. Compressed air is fed through the supply line 15 with the following results.
The initial action of the compressed air entering within the component 32 will be to displace the liquid from the component 32 and to allow liquid in pipes 18 to drain through this component or to be expe].led through the aper-tures or dril]ings 24.
As soon as the apertures or d.rillings 24 are exposed to the compressed air, air will be forced through -these aper-tures and aeration of the liquid will commence.
As the pipes 18 are drained and the flow of compressed air is stabi.lized, the water elevation within the sleeve com-3~
ponen-t 32 will stabilize at an elevation "H2" below the communication of this component 32 with the pipes 18 and this lower elevation is indicated by reference character 35 with H2 illus-trating the change in elevation from the initial flooded condition to the stabilized condi-tion.
This elevation 35 will be set by -the flow of com-pressed air and will be equal to the head of liquid re-quired to have the stabilized air flow pass -through the apertures 24 and it will be noted that level 35 mus-t al-ways be less than the elevation of the air holes or aper-tures 24 above the base of component 32 otherwise air will be discharged below the base of component 32.
With the aeration commencing, reference should be made to Figure 3 which shows the location of the firs-t and second baffles 25 and 27 and the pattern of flow caused by the aeration and illustrated by the air bubbles entrained within the liquid between the baffles.
The specific gravity of the entrained air/liquid between the baffles is less than the specific gravity of the liquid alone so that this mixture rises upwardly and is diverted rearwardly by the second baffle 27. This creates an uplift and a horizontal force on the second baffle 27 and causes movement of the assembly in the direc-tion of arrow 26.
Figures 4 and 5 show -the forces acting per unit area upon the p:Lane of the baffle at point Z with force Pl being proportional to the head of l:iquid H3 existing between point Z and the water surface.
Force P2 is calculated as follows:
P2 equals Pl ~ ( x x H4) where H4 is the vertical head between point Z and the lower limit of the liquid, which contains entrained air, and x is the percentage by volume of air in the liquid in height H4.
P3 is the force acting vertically upon the second baffle 27 and is calcula-ted as follows-P3 equals P2 ~ Pl = 1OO x H4 as hereinbefore descri-bed.
Figure 4A shows the triangle of forces from the force P3 with PL being the vertical moment and P being the hori-zontal moment which causes rotation.
PR can be calculated as equalling P3 since ~ .
This horizontal force PR will cause the device to rotate in the direction of arrow 26 with advantages as fol-lows.
Firstly, complete aeration and mixing of any bot-tom deposits due to the scouring action and the liquid entrance between the first and second baffles indicatecl by arrows 36 and the fact that the dev:Lce is rotating.
~3~
Secondly, there is a longer retention of air bubbles in the tank than of any other device that discharges bubbles of the same size in the same depth of tank. This is because any fixed aeration device results in the formation of a cur-rent caused by the difference in specific gravity and this current carries the bubbles to the surface. In the present device, where the flow is directed by the baffle, there is a defined current. However, the device moves relative to the liquid and, where the aerated liquid leaves the trail-ing end of the second baffle 27, no well defined current can exist.
Thirdly, the only relative motion between any mecha-nical parts in the liquid container is between the fixed post 14 and sleeve 20. Sleeve 20 is a sealed sleeve and between the bearings 21 and 23 the area is filled with lubricant to protect same and, Eurther, when rotation occurs, there is no liquid in contact with the sleeve 20 and post 1 near the lower bearing 21 due to the air pocket formed in this area. Finally, it will be noted that there is no gland required between the rotating component 13 and -the air supply line 15.
Since various modiEications can be made in my inven-tion as hereinabove described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in -the ac-companying specification shall be interpreted as illustra-tive only and not in a limiting sense.
BACKGROUND OF THE INVE _IO
This invention relates to new and useful improvemen-ts in devices for aerating liquid in a circular tank for me-chanically mixing the liquid and scouring deposi-ts from the base of the tank.
Although it is primarily designed for the treatment of sewage, nevertheless it will be appreciated that it can be used with any other process in which a liquid requires aeration and mixing.
Conventionally, when compressed air is used for aera-tion the point a-t which bubbles are emitted is stationary and currents are used for mixing, or mechanical means are provided to rotate devices to improve aeration and mixing.
Such devices that require a separate source of power to cause rotation are by nature more complex to maintain, which is considered a disadvantage.
SUMMARY OF THE INVENTION
The present device overcomes these disadvantages by providing a device whi.ch aerates and mixes a liquid with the use of compressed air only, i-t being understood that the device is rotated no-t by the expulsion of je-t action of the compressed air from the arms but by utilizing the b~
~lw ~ t7~
change in specific gravi-ty oE the liquid when entrained with air, to provide a forward moment to the assembly so that it rotates due to this difference in specific gravi ties reacting against a curved baffle or vane.
The principal object and essence of the invention is to provide a device of the character herewithin des-cribed in which one or more arms is rotated by the release of air through the arm, into the liquid and utilizing the difference in specific gravity of the aerated liquid to provide the rotation to the air dis-tributing arm or armsO
Another object of the invention is to provide a device of the character herewithin described in which the only source of power is a source of compressed air.
Another object of the invention is to provide a device of -the character herewithin described which provides a self scouring action to the base of the enclosure without contact of the rotating component with the base.
A yet further object of the invention is to provide a device of the character herewithin described which pro-vides complete aeration and mixing of any bottom deposits due -to the scouring action at the entrance of the liquid between baf:Eles supported by the aeration pipes or arms.
Yet another object of the invention is to provide a device of the character herewithin described which provides a longer retention of air bubbles in the tank or enclosure than of other devices that discharge similar bubbles of the same size in the same depth of tank.
A ye-t further object of the invention is to provide a device of the charac-ter herewithin described in which -the only relative movement between any mechanical parts in the liquid enclosure is between the supporting post and a rota-table sleeve upon which the arms or pipes are supported.
A still further object of the invention is to provide a device of the character herewithin described which is sim-ple in construc-tion, economical in manufacture and o-therwise well suited to the purpose for which it is designed.
With the foregoing in view, and other advantages as will become apparent to those skilled in the art to which this invention relates as this specification proceeds, the invention is herein described by reference to the accompany-ing drawings forming a part hereof, which includes a des-cription of -the best mode known to the applicant and of the preferred typical embodiment of the principles of the present invention, in which:
DESCRIPTION OF THE DRAWINGS
.
Figure 1 is a cross section of a liquid carrying enclosure with the device installed therein.
Fig~re 2 is a fragmentary top plan view of Figure 1 3~
with the baffles removed for clarity.
Figure 3 is a cross sectional view of one of the pipes showing the baffles supported thereon.
Figure 4 is a schematic view illustrating the for-ces on the baffle at a specific point thereon.
Figure 4A is a triangle of forces resolved from Figure 4.
In the drawings like characters of reference indi-cate corresponding parts in the differen-t figures.
PRELIMINARY DESCRIPTION
Before proceeding with the description of -this inven-tion, it should be noted that the terms "aeration" and "compressed air" are used both in the specification and claims and although in the majority of instances, air will be used as the gas, nevertheless it must be understood that other gases could be used depending upon circumstances and in the attached claims, the terms "air" and "aeration" are presumed to include any other gases which may be utilized without affecting the scope of this invention.
DETAILED DESCR:[PTION
Proceeding therefore to describe the invention in detail, reference should be made to the drawings in which 10 illustrates a liquid enclosure such as a sewage tank which includes a vertically situated substantially cylin-drical wall 11 and a subs-tantially horizontal base 12.
A centrally located we:Ll 13 is formed within the base as illustra-ted in Figure 1 and a fixed vertically situated post 14 extends downwardly through this well and into the concrete or soil below the enclosure so -that the post is rigidly supported in the central vertical loca-tion.
Furthermore, a compressed air supply line 15 ex-tends from a source of compressed air shown schematically by reference character 16 and extends upwardly into the well 13 as will hereinaf-ter be described.
The aerator assembly collectively designated 17 is journalled for rotation upon the post 14 and in this embo-diment includes a pair of diametrically situated pipes 18 secured by the inner ends thereof to a shouldered cylin-drical portion 19 which in turn is secured to the lower end of a cylindrical sleeve 20.
A lower bearing assembly 21 is provided adjacen-t the lower end of the sleeve 20 and an upper bearing assem-bly 22 is provided adjacent -the upper end of the sleeve 20 toge-ther wi.-th a thrust bearing assembly 23.
The sleeve engages over -the Eixed post 14 wi-th the bear.ing assemblies 21, 22 and 23 rnoun-ting -the sleeve and the pi.pes 1~, for rotation within the enclosure 10 so that ~ 3 ~ ~
the pipes can rotate in a horizontal plane spaced just above the base 12 of the enclosure. Where the size of the tank and other factors make it economical, the fixed shaft supporting the bearings rnay be hlmg from a bridge or the like.
Air discharge means are provided within the pipes 18 and take the form, in this embodiment, of a plurality of relatively small apertures or drillings 24 formed through the wall of the pipes and directing compressed air outwardly in a substantially horizontal plane with the holes in one pipe 18 being on the opposite side there-of to the holes in the opposite pipe 18, as clearly shown in the drawings.
In the present drawings, no supports are shown between the outer ends of the pipes 18 and the central cylindrical sleeve 20, but if these pipes are of a con-siderable length, then obviously some form of support will be required. This support may take the Eorm of guy wires extending between the outer ends of the pipes 18 and the cylindrical sleeve 20 but as such support means are well known, it is not believed necessary to illus-trate or describe same Eurther.
A first baEfle 25 is secured to each oE the plpes 18 by we]ding or the like and this baffle is ar-cuately curved and extends upwardly and rearwardly rela--tlve to the direction of travel 26 as clearly illustra-ted in the cross sectional view of Figure 3.
3~
A second baffle 27 is also provided and is arcua-tely curved and is supported from the pipe 18 by means of struts 28 extending between the second baffle 27 and the pipe 18 and also between the second baffle 27 and the first baffle It will be observed that the second baffle is arcua-tely curved with substantially the same curvature as the first baffle 25 and that i-t is supported in spaced and sub-stantially parallel relationship with the first baffle 25.
E~owever, i-t will be observed tha-t the trailing side 2~ of the second baffle 27 extends considerably beyond the trail-ing edge 30 of the first baffle. Once again this is shown clearly in Figure 3.
The lower end or side 31 oE the second baffle 27 is enlarged slightly with a pear drop cross sectional construc-tion to assist in the movement of this baffle through the liquid as will hereinafter be described and it will also be observed that the first baffle 25 is wider at the base thereof than at the trailing edge 30 in order -to give sup-port to this baffle where it is attached -to the pipe 18.
An air in take component 32 is provided below the con-nection of the pipes 18 to the portion 19 o:f the assembly, said component being substantially cylind:rical and open based as illustrated by reference character 33. This cy-~3~
lind.rical component communicates with the interior of the pipes 18 and the lower open side 33 is situated spaced be-low the plane of the discharge apertures 24 within the pipes 18.
It will also be noted that the discharge end 34 of the compressed air supply line 15 engages through the open base 33 of the cylindrical component 32 and termina-tes with-in this cylindrical component, but once again, spaced below the plane of the apertures 24 within the pipes 18.
In operation, and with the enclosure fi.lled with liquid, the lower open portion or sleeve component 32 will be filled with liquid together with the pipes 18. Compressed air is fed through the supply line 15 with the following results.
The initial action of the compressed air entering within the component 32 will be to displace the liquid from the component 32 and to allow liquid in pipes 18 to drain through this component or to be expe].led through the aper-tures or dril]ings 24.
As soon as the apertures or d.rillings 24 are exposed to the compressed air, air will be forced through -these aper-tures and aeration of the liquid will commence.
As the pipes 18 are drained and the flow of compressed air is stabi.lized, the water elevation within the sleeve com-3~
ponen-t 32 will stabilize at an elevation "H2" below the communication of this component 32 with the pipes 18 and this lower elevation is indicated by reference character 35 with H2 illus-trating the change in elevation from the initial flooded condition to the stabilized condi-tion.
This elevation 35 will be set by -the flow of com-pressed air and will be equal to the head of liquid re-quired to have the stabilized air flow pass -through the apertures 24 and it will be noted that level 35 mus-t al-ways be less than the elevation of the air holes or aper-tures 24 above the base of component 32 otherwise air will be discharged below the base of component 32.
With the aeration commencing, reference should be made to Figure 3 which shows the location of the firs-t and second baffles 25 and 27 and the pattern of flow caused by the aeration and illustrated by the air bubbles entrained within the liquid between the baffles.
The specific gravity of the entrained air/liquid between the baffles is less than the specific gravity of the liquid alone so that this mixture rises upwardly and is diverted rearwardly by the second baffle 27. This creates an uplift and a horizontal force on the second baffle 27 and causes movement of the assembly in the direc-tion of arrow 26.
Figures 4 and 5 show -the forces acting per unit area upon the p:Lane of the baffle at point Z with force Pl being proportional to the head of l:iquid H3 existing between point Z and the water surface.
Force P2 is calculated as follows:
P2 equals Pl ~ ( x x H4) where H4 is the vertical head between point Z and the lower limit of the liquid, which contains entrained air, and x is the percentage by volume of air in the liquid in height H4.
P3 is the force acting vertically upon the second baffle 27 and is calcula-ted as follows-P3 equals P2 ~ Pl = 1OO x H4 as hereinbefore descri-bed.
Figure 4A shows the triangle of forces from the force P3 with PL being the vertical moment and P being the hori-zontal moment which causes rotation.
PR can be calculated as equalling P3 since ~ .
This horizontal force PR will cause the device to rotate in the direction of arrow 26 with advantages as fol-lows.
Firstly, complete aeration and mixing of any bot-tom deposits due to the scouring action and the liquid entrance between the first and second baffles indicatecl by arrows 36 and the fact that the dev:Lce is rotating.
~3~
Secondly, there is a longer retention of air bubbles in the tank than of any other device that discharges bubbles of the same size in the same depth of tank. This is because any fixed aeration device results in the formation of a cur-rent caused by the difference in specific gravity and this current carries the bubbles to the surface. In the present device, where the flow is directed by the baffle, there is a defined current. However, the device moves relative to the liquid and, where the aerated liquid leaves the trail-ing end of the second baffle 27, no well defined current can exist.
Thirdly, the only relative motion between any mecha-nical parts in the liquid container is between the fixed post 14 and sleeve 20. Sleeve 20 is a sealed sleeve and between the bearings 21 and 23 the area is filled with lubricant to protect same and, Eurther, when rotation occurs, there is no liquid in contact with the sleeve 20 and post 1 near the lower bearing 21 due to the air pocket formed in this area. Finally, it will be noted that there is no gland required between the rotating component 13 and -the air supply line 15.
Since various modiEications can be made in my inven-tion as hereinabove described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in -the ac-companying specification shall be interpreted as illustra-tive only and not in a limiting sense.
Claims
CLAIMS:
(1) In a liquid containing enclosure which includes a surrounding wall and a base and a source of compressed air, an aerator assembly, said assembly comprising in com-bination at least one substantially horizontally rotatable pipe, means to mount said pipe for rotation within said en-closure in a plane parallel to and spaced above the base of said enclosure, a plurality of air discharge means for-med along the length of said pipe and operatively connec-ted to the source of compressed air, first baffle means at-tached to said pipe and second baffle means supported in spaced and substantially parallel relationship to said first baffle means, said first and second baffle means ex-tending upwardly from said pipe and at an angle from the vertical, said air discharge means discharging air from said pipe between said first and second baffle means adja-cent the lower ends thereof, and entraining within the liquid in said enclosure and between said first and second baffle means and reacting upon said second baffle means thereby providing a horizontal moment against said second baffle means for applying rotation to said assembly.
(2) The assembly according to Claim 1 in which said first and second baffle means are arcuately curved.
(3) The assembly according to Claim 1 in which said second baffle means extending upwardly and rearwardly be-yond said first baffle means.
(4) The assembly according to Claim 2 in which said second baffle means extends upwardly and rearwardly be-yond said first baffle means.
(5) The assembly according to Claim 1 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(6) The assembly according to Claim 2 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(7) The assembly according to Claim 3 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(8) The assembly according to Claim 4 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(9) An aerator assembly for use within a liquid carrying enclosure which includes a surrounding wall and a base and a source of compressed air; said aerator assembly comprising in combination at least one substantially hori-zontally situated pipe, means to mount said pipe for rota-tion within said enclosure in a substantially horizontal plane spaced above the base of said enclosure, a plurality of air discharge means along the length of said pipe and means to operatively connect a source of compressed air with the interior of said pipe, a first arcuately curved baffle secured to and extending upwardly and rearwardly from said pipe, and a second arcuately curved baffle sup-ported upon said pipe and also curving upwardly and rear-wardly spaced and substantially parallel to said first baffle, said means to operatively connect said source of compressed air with the interior of said pipe including an open based air intake component operatively connected to said pipe and to said source of compressed air and extending below said means to mount said pipe, said open base being below said air discharge means, said source of compressed air communicating with said air intake compo-nent below said air discharge means.
(10) The assembly according to Claim 9 in which said second baffle means extends upwardly and rearwardly beyond said first baffle means.
(11) The assembly according to Claim 9 in which said assembly includes at least two pipes extending dia-metrically opposite one another, said means to mount said pipes including a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes.
(1) In a liquid containing enclosure which includes a surrounding wall and a base and a source of compressed air, an aerator assembly, said assembly comprising in com-bination at least one substantially horizontally rotatable pipe, means to mount said pipe for rotation within said en-closure in a plane parallel to and spaced above the base of said enclosure, a plurality of air discharge means for-med along the length of said pipe and operatively connec-ted to the source of compressed air, first baffle means at-tached to said pipe and second baffle means supported in spaced and substantially parallel relationship to said first baffle means, said first and second baffle means ex-tending upwardly from said pipe and at an angle from the vertical, said air discharge means discharging air from said pipe between said first and second baffle means adja-cent the lower ends thereof, and entraining within the liquid in said enclosure and between said first and second baffle means and reacting upon said second baffle means thereby providing a horizontal moment against said second baffle means for applying rotation to said assembly.
(2) The assembly according to Claim 1 in which said first and second baffle means are arcuately curved.
(3) The assembly according to Claim 1 in which said second baffle means extending upwardly and rearwardly be-yond said first baffle means.
(4) The assembly according to Claim 2 in which said second baffle means extends upwardly and rearwardly be-yond said first baffle means.
(5) The assembly according to Claim 1 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(6) The assembly according to Claim 2 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(7) The assembly according to Claim 3 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(8) The assembly according to Claim 4 in which said assembly includes at least two pipes extending diametrically opposite one another, said means to mount said pipes inclu-ding a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes, and an open based gas intake component supported on the lower end of said pipe support means and communicating with said air discharge means in said pipes, the lower end of said component being below said air discharge means, said source of compressed air communicating with the inte-rior of said component below the level of said air dis-charge means.
(9) An aerator assembly for use within a liquid carrying enclosure which includes a surrounding wall and a base and a source of compressed air; said aerator assembly comprising in combination at least one substantially hori-zontally situated pipe, means to mount said pipe for rota-tion within said enclosure in a substantially horizontal plane spaced above the base of said enclosure, a plurality of air discharge means along the length of said pipe and means to operatively connect a source of compressed air with the interior of said pipe, a first arcuately curved baffle secured to and extending upwardly and rearwardly from said pipe, and a second arcuately curved baffle sup-ported upon said pipe and also curving upwardly and rear-wardly spaced and substantially parallel to said first baffle, said means to operatively connect said source of compressed air with the interior of said pipe including an open based air intake component operatively connected to said pipe and to said source of compressed air and extending below said means to mount said pipe, said open base being below said air discharge means, said source of compressed air communicating with said air intake compo-nent below said air discharge means.
(10) The assembly according to Claim 9 in which said second baffle means extends upwardly and rearwardly beyond said first baffle means.
(11) The assembly according to Claim 9 in which said assembly includes at least two pipes extending dia-metrically opposite one another, said means to mount said pipes including a fixed vertical mounting post extending upwardly from the base of said enclosure, pipe support means journalled for rotation upon said post, said pipes being secured to said pipe support means by the inner ends of said pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000415859A CA1183972A (en) | 1982-11-18 | 1982-11-18 | Self-propelled rotating aerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000415859A CA1183972A (en) | 1982-11-18 | 1982-11-18 | Self-propelled rotating aerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183972A true CA1183972A (en) | 1985-03-12 |
Family
ID=4123970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000415859A Expired CA1183972A (en) | 1982-11-18 | 1982-11-18 | Self-propelled rotating aerator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1183972A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674573A (en) * | 2012-05-11 | 2012-09-19 | 孟祥凤 | Pneumatic rotary arm type aerator |
| US20190084896A1 (en) * | 2017-09-15 | 2019-03-21 | Daniel T. Scott | Aerobic Composting System |
-
1982
- 1982-11-18 CA CA000415859A patent/CA1183972A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674573A (en) * | 2012-05-11 | 2012-09-19 | 孟祥凤 | Pneumatic rotary arm type aerator |
| US20190084896A1 (en) * | 2017-09-15 | 2019-03-21 | Daniel T. Scott | Aerobic Composting System |
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