US3584840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixing device for introducing additives into a liquid
Assignee: Alfa Laval Inc
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Filing: 1968-09-26
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Granted: 1971-06-15
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Expires: 1988-09-26
Abstract
Abstract A mixing device for introducing additives, particularly gaseous additives into a liquid to produce mixtures, solutions, emulsions or suspensions, comprising a rotatable drive shaft immersible in the liquid, a rotatable mixing propeller driven by the drive shaft, a bore in the drive shaft and/or a separate carrier tube or tubes concentrically surrounding the drive shaft, through which the additives can be delivered and a stationary guide ring concentrically surrounding the mixing propeller at a radial distance from its outer edge.
Inventors
- 👤 Hubert Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:37
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; C02F3/205; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2334; B01F23/2331; B01F23/23311; B01F23/23312; B01F23/2336; B01F23/23362; B01F23/40; B01F23/43; B01F23/431; B01F23/23363; B01F27/00; B01F27/05; B01F27/11; B01F27/112; B01F27/1125; B01F27/114; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
39 words
A mixing device as claimed in claim 1, in which the stationary guide ring surrounding the mixing propeller and spaced therefrom is inclined so that it is substantially funnel-shaped with its inner edge at a level above the propeller.
Claim 2
Dependent Claim
22 words
A mixing device as claimed in claim 2, in which the stationary guide ring is in the form of a truncated cone.
Claim 3
Dependent Claim
18 words
A mixing device as claimed in claim 3, including a collar at the neck of the truncated cone.
Claim 4
Dependent Claim
17 words
A mixing device as claimed in claim 2, in which the guide ring is substantially inverted bell-shape.
Claim 5
Dependent Claim
17 words
A mixing device as claimed in claim 2, in which the guide ring has an aerofoil shape.
Claim 6
Dependent Claim
22 words
A mixing device as claimed in claim 1, in which the mixing propeller is multibladed having individual blades which are substantially spiral-shaped.
Claim 7
Dependent Claim
36 words
A mixing device as claimed in claim 7, in which the individual blades each correspond to a function expressed in polar coordinates having the general from r a/ psi +b, wherein a and b are constants.
Claim 8
Dependent Claim
48 words
A mixing device as claimed in claim 7, in which the individual blades correspond in their basic shape to an exponential function expressed in polar coordinates: r a +b or r a +b, wherein a and b are general constants and e is the base of natural logarithms.
Claim 9
Dependent Claim
69 words
A mixing device as claimed in claim 7, including a substantially horizontal guide web disposed, on the multibladed mixing propeller between adjacent spiral-shaped blades, the liquid to be treated flowing into a suction area formed at the underside of the guide web and the additives being delivered axially to the topside of the propeller and being drawn off radially from the mixing propeller with as little turbulence as possible.
Claim 10
Dependent Claim
60 words
A mixing device as claimed in claim 10, in which the horizontal guide web tapers wedgelike towards its outer edge, is concavely rounded on both sides and is extended further outwardly at the concave suction side (i.e. the inside) of one blade in the direction of rotation, than at the convex pressure side (i.e. the outside) of the following blade.
Claim 11
Dependent Claim
23 words
A mixing device as claimed in claim 7, in which the individual blades of the mixing propeller each gaper towards the outer edge.
Claim 12
Dependent Claim
43 words
A mixing device as claimed in claim 1, in which said carrier tube defining the passageway is a bore in the drive shaft of the mixing propeller and the drive shaft has a lateral orifice therein through which the additive can be delivered.
Claim 13
Dependent Claim
39 words
A mixing device as claimed in claim 1, said propeller having Blades, and radial discharge passages arranged in the hub of the mixing propellers, connected to the bore in the hollow drive shaft and opening between adjacent propeller blades
Claim 14
Dependent Claim
53 words
A mixing device as claimed in claim 1, in which the means defining the passageway is a stationary tube concentric with the drive shaft and spaced therefrom to form an annular space between the drive shaft and the tube, the space being in communication with a delivery pipe for delivery of an additive.
Claim 15
Dependent Claim
59 words
A mixing device as claimed in claim 15, including a shaft bearing for the drive shaft in the end of the stationary carrier tube adjacent the mixing propeller, the shaft bearing including apertures for the flow of additives therethrough, said apertures being directed obliquely toward the blades of the mixing propeller in the direction of rotation of the propeller.
Claim 16
Dependent Claim
32 words
A mixing device as claimed in claim 15, including a flow control member located in the delivery pipe which supplies additive to the annular space to meter the additives to be introduced.
Claim 17
Dependent Claim
104 words
A mixing device as claimed in claim 15, having at least two stationary delivery tubes arranged concentrically to the drive shaft, for supply of a corresponding number of additives, the concentric delivery tubes being flared at the discharge end; said propellar having blades and scoop-shape guide webs on the mixing propeller between adjacent blades at the upper edge thereof, each in alignment with a respective one of the two delivery tubes, the scoop-shaped guide webs each ending in a horizontal portion; and radially directed guide webs at a distance below the guide webs, concave on both sides and mounted directly on the propeller hub.
Claim 18
Dependent Claim
112 words
A mixing device as claimed in claim 15, having at least two stationary delivery tubes concentric to the drive shaft for supply of a corresponding number of additives, the concentric delivery tubes being stepped relative to each other at the discharge end, the steps rising outwardly, said propeller having blades being correspondingly stepped at their upper edges to engage over the open ends of the tubes; a respective horizontal guide web between adjacent propeller blades, adjacent to the discharge end of each delivery tube and at corresponding distances from each other; and at a distance below said horizontal guide web, a further guide web joined directly to the hub of the propeller.
Claim 19
Independent Claim
144 words
A method of adding a fluid particularly a gas such as air to a liquid such as water for facilitating its purification, comprising producing an upward liquid flow in the liquid below the surface thereof and then a radial outward flow of the liquid below the surface in a manner to create a respective pressure adjacent the radial outward flow, and permitting a fluid such as air to flow downwardly to the location of the radial outward flow under the influence of the pressure created by the radial outward flow, and deflecting both the incoming fluid and the liquid so that the flow remains in a general radial direction whereby to utilize the force of the gas and the liquid flow to move and to intermix the gas before the gas and the liquid flow is permitted to move the surface of the liquid.
Claim 20
Dependent Claim
25 words
A method, according to claim 20, wherein the gas and liquid flow is deflected substantially obliquely downwardly in respect to the surface of the liquid.
Claim 21
Dependent Claim
16 words
A method, according to claim 20, wherein the gas and liquid flow is deflected substantially radially.
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |