Patent US4679809A successfully refreshed from Google Patents.
Patent US3750940A successfully refreshed from Google Patents.
US3750940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means for self-discharging centrifuge
Assignee: Alfa Laval AB
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Filing: 1971-12-03
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Granted: 1973-08-07
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Expires: 1991-12-03
Abstract
Abstract The centrifugal rotor has an inlet for the mixture to be separated, a central outlet for a separated liquid component of the mixture, and peripheral outlets for separated sediment of the mixture, means being provided for alternately opening and closing the peripheral outlets. The rotor is charged with a special liquid having a density intermediate those of the separated liquid component and the separated sediment, whereby an interface is formed in the rotor between the separated liquid component and the special liquid; and means are provided for sensing when this interface has moved radially inward to a predetermined level in the rotor.
Inventors
- 👤 V Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:13
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/10; B04B1/14; B04B1/16; B04B1/18; B04B11/00; B04B11/02; B04B13/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A centrifugal separator comprising a rotor having a separating chamber provided with an inlet for a mixture to be separated, said mixture including a liquid component and sediment, the separating chamber having a central outlet for said liquid component separated from the mixture, said chamber also having peripheral outlets for said sediment separated from said mixture, control means for alternately closing and opening said pripheral outlets during operation of the rotor, a source of special liquid having a density greater than that of said liquid component but smaller than that of said sediment, and means for charging the separating chamber with said special liquid, whereby an interface is formed in said chamber between said separated liquid component and said special liquid, the separator being characterized by means for sensing when said interface has moved radially inward to a predetermined level in the separating chamber.
Claim 2
Dependent Claim
144 words
A centrifugal separator comprising a rotor having a separating chamber provided with an inlet for a mixture to be separated, said mixture including a liquid component and sediment, the separating chamber having a central outlet for said liquid component separated from the mixture, said chamber also having peripheral outlets for said sediment separated from said mixture, control means for alternately closing and opening said pripheral outlets during operation of the rotor, a source of special liquid having a density greater than that of said liquid component but smaller than that of said sediment, and means for charging the separating chamber with said special liquid, whereby an interface is formed in said chamber between said separated liquid component and said special liquid, the separator being characterized by means for sensing when said interface has moved radially inward to a predetermined level in the separating chamber.
Claim 3
Dependent Claim
30 words
A separator according to claim 1 comprising also means operatively connected to said sensing means, and responsive to said sensing, for actuating said control means to open said peripheral outlets.
Claim 4
Dependent Claim
25 words
A separator according to claim 1, in which said charging means are operable to feed said special liquid to the rotor at a predetermined rate.
Claim 5
Dependent Claim
22 words
A separator according to claim 1, in which said charging means are operable to feed said special liquid continuously to the rotor.
Claim 6
Dependent Claim
27 words
A separator according to claim 1, in which said sensing means include a device for sensing a difference between said separated liquid component and said special liquid.
Claim 7
Dependent Claim
28 words
A separator according to claim 5, in which said device is operable to sense a difference between the dielectric constants of said liquid component and said special Liquid.
Claim 8
Dependent Claim
50 words
A separator according to claim 1, in which the rotor includes a channel beginning at said predetermined level, the separator comprising also means for creating a liquid flow through said channel from said level, said sensing means being operable to sense a change in the liquid flowing through said channel.
Claim 9
Dependent Claim
29 words
A separator according to claim 7, comprising also a conduit for supplying said mixture to said rotor inlet, said channel having its outlet end in communication with said conduit.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |