US3704009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turboventilator for the input of oxygen into liquids
Assignee: FMC Corp
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Filing: 1971-05-03
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Granted: 1972-11-28
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Expires: 1991-05-03
Abstract
Abstract A turbo ventilator for mechanically aerating sewage to activate the sludge during the biological purification is disclosed. A vertical shaft mounts a plurality of circumferentially spaced box-like jet formers which are rotated at the surface of the liquid. These jet formers supply upstanding radially spaced vanes extending between upper and lower enclosure plates to provide short, box-like jet forming tubes. As these jet formers are rotated in the surface layer of the tank, water is taken in a substantially horizontal plane and is accelerated to produce horizontally travelling jets that entrain bubbles of air. These jets are discrete enough and have enough momentum to reach the walls of the tank whereupon they are deflected downwardly to further oxygenate the body of water in the tank. The water is returned to the inlet sides of the jet former tubes from a whirlpool at the center of the tank and makes smooth and nonturbulent transition to a horizontal flow pattern before it re-enters the aerator jet formers.
Inventors
- 👤 Karl-Heinz Kalbskopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:44
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/14; C02F3/16; B; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/15; B01F23/00; B01F23/20; B01F23/23; B01F23/234; B01F23/2342; B01F23/23421; B01F23/234211; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
138 words
A mechanical aerator for introducing oxygen into a body of liquid comprising a generally vertical shaft, means for rotating said shaft, means mounting a plurality of circumferentially spaced, box-like jet formers on said shaft for rotation at the surface layer of liquid with the inlets and outlets of said jet formers partially submerged in the liquid; said jet formers comprising upstanding radially spaced vanes that are generally parallel, upper and lower closure plates for the vanes, said lower closure plates being circumferentially spaced to provide for the entry of liquid from below, the circumferential extent of said vanes being not substantially greater than twice the radial spacing of adjacent vanes, said vanes having their leading edges on a smaller radius of rotation than their trailing edges for horizontally accelerating the surface layer of liquid into diverging jet streams.
Claim 2
Dependent Claim
138 words
A mechanical aerator for introducing oxygen into a body of liquid comprising a generally vertical shaft, means for rotating said shaft, means mounting a plurality of circumferentially spaced, box-like jet formers on said shaft for rotation at the surface layer of liquid with the inlets and outlets of said jet formers partially submerged in the liquid; said jet formers comprising upstanding radially spaced vanes that are generally parallel, upper and lower closure plates for the vanes, said lower closure plates being circumferentially spaced to provide for the entry of liquid from below, the circumferential extent of said vanes being not substantially greater than twice the radial spacing of adjacent vanes, said vanes having their leading edges on a smaller radius of rotation than their trailing edges for horizontally accelerating the surface layer of liquid into diverging jet streams.
Claim 3
Dependent Claim
26 words
The aerator of claim 1, wherein said jet former closure plates are radially continuous with at least three substantially equally spaced vanes extending between the plates.
Claim 4
Dependent Claim
19 words
The aerator of claim 2, wherein the upper closure plates overhang the leading and trailing edges of said vanes.
Claim 5
Dependent Claim
17 words
The aerator of claim 3, wherein the lower closure plates are substantially horizontally coextensive with said vanes.
Claim 6
Dependent Claim
15 words
The aerator of claim 2, wherein said closure plates converge slightly toward their trailing edges.
Claim 7
Dependent Claim
16 words
The aerator of claim 2, wherein said vanes are curved with their concave faces facing forwardly.
Claim 8
Dependent Claim
14 words
The aerator of claim 6, wherein the leading portions of said vanes are straight.
Claim 9
Dependent Claim
29 words
The aerator of claim 1, wherein the circumferential extent of said vanes is in the range of about one half to one times the radial spacing of the vanes.
Claim 10
Dependent Claim
28 words
The aerator of claim 1, wherein the height of said vanes is in the range of about one to 1 1/2 times the radial spacing of the vanes.
Claim 11
Dependent Claim
28 words
The aerator of claim 8, wherein the height of said vanes is in the range of about one to 1 1/2 times the radial spacing of the vanes.
Claim 12
Dependent Claim
17 words
The aerator of claim 1, wherein the velocity of said vanes is about 10 - 20 feet/second.
Claim 13
Dependent Claim
27 words
The aerator of claim 1, wherein said jet formers are disposed so that the upper ends of said vanes are above the surface of the tank liquid.
Claim 14
Dependent Claim
100 words
An aerator for introducing oxygen into liquid in a tank comprising a generally vertical shaft, means for rotating said shaft, upper and lower hub discs on said shaft at the surface layer of liquid in the tank, a plurality of pairs of vertically spaced, spoke-like plates projecting radially from said discs, a plurality of liquid accelerating vanes extending generally vertically between each pair of plates to provide arms embodying box-like jet formers, said vanes having their leading edges on a smaller radius of rotation than their trailing edges for horizontally accelerating the surface layer of liquid into diverging jet streams.
Claim 15
Dependent Claim
100 words
An aerator for introducing oxygen into liquid in a tank comprising a generally vertical shaft, means for rotating said shaft, upper and lower hub discs on said shaft at the surface layer of liquid in the tank, a plurality of pairs of vertically spaced, spoke-like plates projecting radially from said discs, a plurality of liquid accelerating vanes extending generally vertically between each pair of plates to provide arms embodying box-like jet formers, said vanes having their leading edges on a smaller radius of rotation than their trailing edges for horizontally accelerating the surface layer of liquid into diverging jet streams.
Claim 16
Dependent Claim
16 words
The aerator of claim 13, wherein said hub discs are peripherally connected by a cylindrical baffle.
Claim 17
Dependent Claim
14 words
The aerator of claim 14, wherein said hub is watertight to form a float.
Claim 18
Dependent Claim
22 words
The aerator of claim 13, comprising a cone projecting down from the lower hub disc for controlling the whirlpool below the aerator.
Claim 19
Dependent Claim
24 words
The aerator of claim 13, wherein said jet former arms are inclined upwardly from their radially inner ends at about 10* to 30* .
Claim 20
Dependent Claim
100 words
A mechanical aerator for a large body of liquid comprising a vertical shaft, a plurality of relatively short, large cross section circumferentially extending jet forming tubes mounted on said shaft and at a substantial radial distance therefrom, said jet forming tubes having their sidewalls inclined from a tangent to their path of rotation so that their leading edges are closer to the shaft than their trailing edges, said tubes having a length that is not substantially more than twice their cross-sectional width, and means for rotating said shaft with the tubes at the surface layer of said body of liquid.
Claim 21
Dependent Claim
100 words
A mechanical aerator for a large body of liquid comprising a vertical shaft, a plurality of relatively short, large cross section circumferentially extending jet forming tubes mounted on said shaft and at a substantial radial distance therefrom, said jet forming tubes having their sidewalls inclined from a tangent to their path of rotation so that their leading edges are closer to the shaft than their trailing edges, said tubes having a length that is not substantially more than twice their cross-sectional width, and means for rotating said shaft with the tubes at the surface layer of said body of liquid.
Claim 22
Dependent Claim
22 words
The aerator of claim 18, wherein said tubes are inclined about 10* to 30* with said tangent to their paths of rotation.
Claim 23
Dependent Claim
29 words
The aerator of claim 1, wherein said upper and lower closure plates are substantially flat and parallel and with the upper closure plate being disposed above the liquid surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |