US3642196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuge with sludge level sensing means
Assignee: Alfa Laval AB
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Filing: 1970-05-04
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Granted: 1972-02-15
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Expires: 1990-05-04
Abstract
Abstract The centrifugal rotor has a sludge-accumulating space from which an indicating channel extends inwardly to the region of the rotor axis. Clogging of the outer end of this channel by sludge is sensed by a device comprising a pressure signal amplifier, a pressure differential gage, a pressure-transmitting connection between one side of the amplifier and one side of the gage, a connection for transmitting a pressure of the liquid being separated, and a connection for transmitting a pressure of the liquid in the indicating channel, one of said last two connections leading to the other side of the amplifier and the other of said last two connections leading to the other side of said gage. Thus, the arrangement provides a measure of the difference between the pressure of the indicating liquid and the pressure of the separated liquid.
Inventors
- 👤 Vilgot Raymond Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:22
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/10; B04B1/14; B04B1/16; B04B1/18; B04B1/04; B04B1/08; B04B11/00; B04B11/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
In combination with a centrifuge comprising a centrifugal rotor having an inlet for sludge-containing liquid and also having an outlet for separated liquid and a sludge space for accumulating separated sludge, the rotor being provided with an indicating channel extending from said sludge space inwardly to the region of the rotor axis and rotating with the rotor, a device connected to said channel for sensing when sludge clogs the opening of the channel into the sludge space, said device comprising a pressure signal amplifier, a pressure differential gage, a pressure-transmitting connection between one side of the amplifier and one side of the gage, a connection for transmitting a pressure of the liquid being separated to one of said amplifier and gage, and a connection for transmitting to the other of said amplifier and gage a pressure of the liquid in the indicating channel, one of said last two connections leading to the other side of the amplifier and the other of said last two connections leading to the other side of said gage.
Claim 2
Dependent Claim
173 words
In combination with a centrifuge comprising a centrifugal rotor having an inlet for sludge-containing liquid and also having an outlet for separated liquid and a sludge space for accumulating separated sludge, the rotor being provided with an indicating channel extending from said sludge space inwardly to the region of the rotor axis and rotating with the rotor, a device connected to said channel for sensing when sludge clogs the opening of the channel into the sludge space, said device comprising a pressure signal amplifier, a pressure differential gage, a pressure-transmitting connection between one side of the amplifier and one side of the gage, a connection for transmitting a pressure of the liquid being separated to one of said amplifier and gage, and a connection for transmitting to the other of said amplifier and gage a pressure of the liquid in the indicating channel, one of said last two connections leading to the other side of the amplifier and the other of said last two connections leading to the other side of said gage.
Claim 3
Dependent Claim
35 words
The combination according to claim 1, comprising also stationary ducts connected to said rotor inlet and outlet, respectively, said connection for transmitting a pressure of the liquid being separated being connected to the rotor outlet.
Claim 4
Dependent Claim
29 words
The combination according to claim 1, in which said connection for transmitting a pressure of the liquid is separated being connected to said rotor outlet for the separated liquid.
Claim 5
Dependent Claim
13 words
The combination according to claim 1, in which said pressure-transmitting connections are pneumatic.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |