Patent US3254481A successfully refreshed from Google Patents.
US3752389A
Expired / Lapsed
US
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Centrifugal separator with control means
Assignee: Alfa Laval AB
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Filing: 1971-12-03
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Granted: 1973-08-14
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Expires: 1991-12-03
Abstract
Abstract The rotor has a central outlet for a separated light liquid component, an intermittently opened peripheral outlet for separated sediment, and a third outlet for a separated heavy liquid component, there being a passage for conducting liquid from the third outlet to a reception place for heavy liquid component. Means are provided for controlling liquid flow to this reception place through said passage, and further means are provided for sensing when separated heavy liquid component is at a predetermined level in the rotor, said last means being operable upon such sensing to actuate the controlling means to effect liquid flow to the reception place through said passage.
Inventors
- 👤 V Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:16
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/10; B04B1/14; B04B1/16; B04B1/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
162 words
A centrifugal separator comprising a rotor provided with an inlet for a mixture to be separated, the rotor forming a separating chamber having three outlets for discharging from the rotor, namely, a central outlet for a separated light liquid component of the mixture, an intermittently opened outlet at the rotor periphery for separated sedimEnt, and a third outlet for a separated heavy liquid component of the mixture, said third outlet being located between the other two outlets, and means forming a passage for discharging liquid from said third outlet to a reception place for heavy liquid component, the separator being characterized by control means associated with said passage and operable to alternately prevent and allow liquid flow therethrough to said reception place, and means for sensing when separated heavy liquid component is at a predetermined level within the rotor and operable in response to such sensing to actuate said control means to allow liquid flow through said passage to the reception place.
Claim 2
Dependent Claim
162 words
A centrifugal separator comprising a rotor provided with an inlet for a mixture to be separated, the rotor forming a separating chamber having three outlets for discharging from the rotor, namely, a central outlet for a separated light liquid component of the mixture, an intermittently opened outlet at the rotor periphery for separated sedimEnt, and a third outlet for a separated heavy liquid component of the mixture, said third outlet being located between the other two outlets, and means forming a passage for discharging liquid from said third outlet to a reception place for heavy liquid component, the separator being characterized by control means associated with said passage and operable to alternately prevent and allow liquid flow therethrough to said reception place, and means for sensing when separated heavy liquid component is at a predetermined level within the rotor and operable in response to such sensing to actuate said control means to allow liquid flow through said passage to the reception place.
Claim 3
Dependent Claim
16 words
The separator of claim 1, in which said control means are a valve in said passage.
Claim 4
Dependent Claim
22 words
The separator of claim 1, comprising also means under control of said sensing means for opening said rotor outlet for separated sediment.
Claim 5
Dependent Claim
57 words
The separator of claim 1, in which said central outlet is adapted to maintain the liquid pressure therein constant, said third outlet being formed by a channel extending toward the rotor axis from a point in the separating chamber located radially outside said predetermined level, said sensing means being a pressure sensing device communicating with said channel.
Claim 6
Dependent Claim
23 words
The separator of claim 1, in which said sensing means are operable to sense a difference between such light and heavy liquid components.
Claim 7
Dependent Claim
27 words
The separator of claim 1, in which said sensing means are operable to sense a difference between the dielectric constants of said light and heavy liquid components.
Claim 8
Dependent Claim
61 words
The separator of claim 1, in which said third outlet is formed by a channel extending from a point in the separating chamber located substantially at said predetermined level, the separator comprising also means for creating a liquid flow through the channel from said point, said sensing means being operable to sense a change in the liquid flowing through said channel.
Claim 9
Dependent Claim
19 words
The separator of claim 1, comprising also means for returning liquid from said third outlet to said rotor inlet.
Claim 10
Dependent Claim
27 words
The separator of claim 8, in which said returning means lead from said passage at a region thereof located between said third outlet and said control means.
Claim 11
Dependent Claim
29 words
The separator of claim 8, comprising also a device for blocking liquid flow through said returning means in response to liquid flow through said passage to said reception place.
Claim 12
Dependent Claim
31 words
The separator of claim 9, comprising also a valve located in said returning means and operable to permit liquid flow therethrough only while a predetermined minimal pressure prevails in said passage.
Claim 13
Dependent Claim
52 words
The separator of claim 9, comprising also a throttle in said returning means, said control means being a valve having a greater throughflow capacity than the throttle, said sensing means being a pressure sensing device communicating with said passage at a region thereof located between said third outlet and said returning means.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |