Patent US3563453A successfully refreshed from Google Patents.
US3563453A
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Method and apparatus for indicating sludge level in sludge centrifuge
Assignee: Alfa Laval AB
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Filing: 1969-02-20
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Granted: 1971-02-16
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Expires: 1989-02-20
Abstract
Abstract The centrifugal rotor is provided with a channel extending inwardly from the sludge space toward the axis of the rotor, and a reciprocating movement is imparted to a quantity of liquid in this channel. When the outer end of the channel becomes clogged by accumulated sludge, a substantial change occurs in the resistance to movement of the reciprocating liquid, and this change is sensed to indicate the sludge level.
Inventors
- 👤 Paul Kompert
- 👤 Carl-Goran Nilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:43
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/10; B04B1/14; Y; Y10; Y10S; Y10S494/00; Y10S494/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
In the operation of a sludge centrifuge having a rotor provided with a channel extending from the sludge-collecting space toward the rotor axis, a method of indicating the sludge level in said spacE, the method comprising the steps of imparting a reciprocating movement to a liquid quantity in said channel, and sensing a change in the resistance to said movement which occurs when sludge at least partly clogs the opening of said channel into the sludge-collecting space.
Claim 2
Dependent Claim
77 words
In the operation of a sludge centrifuge having a rotor provided with a channel extending from the sludge-collecting space toward the rotor axis, a method of indicating the sludge level in said spacE, the method comprising the steps of imparting a reciprocating movement to a liquid quantity in said channel, and sensing a change in the resistance to said movement which occurs when sludge at least partly clogs the opening of said channel into the sludge-collecting space.
Claim 3
Dependent Claim
91 words
In combination with a sludge centrifuge including a centrifugal rotor having a space for collecting separated sludge and also having a channel extending from said space toward the rotor axis, apparatus for indicating the sludge level in said space and comprising mean for imparting a reciprocating movement to a quantity of liquid in said channel, and means communicating with said channel for sensing a change which occurs in the resistance to said reciprocating movement in response to at least partial clogging of the opening of said channel into the sludge space.
Claim 4
Dependent Claim
91 words
In combination with a sludge centrifuge including a centrifugal rotor having a space for collecting separated sludge and also having a channel extending from said space toward the rotor axis, apparatus for indicating the sludge level in said space and comprising mean for imparting a reciprocating movement to a quantity of liquid in said channel, and means communicating with said channel for sensing a change which occurs in the resistance to said reciprocating movement in response to at least partial clogging of the opening of said channel into the sludge space.
Claim 5
Dependent Claim
15 words
The combination according to claim 2, in which said sensing means are pressure sensing means.
Claim 6
Dependent Claim
33 words
The combination according to claim 2, in which said means for imparting a reciprocating movement include a chamber communicating with said channel and having a movable wall, and means for reciprocating said wall.
Claim 7
Dependent Claim
67 words
The combination according to claim 2, in which said means for imparting a reciprocating movement include a chamber communicating with said channel and having a movable wall, means for reciprocating said wall to generate movement of the liquid quantity in one direction, and a centripetal pump located in the central portion of the rotor and operable to generate movement of said liquid quantity in the opposite direction.
Claim 8
Dependent Claim
24 words
The combination according to claim 2, comprising also means for maintaining a volume of gas through which the sensing means communicate with said channel.
Claim 9
Dependent Claim
36 words
The combination according to claim 2, in which said means for imparting a reciprocating movement include a gas-filled chamber communicating with said channel, and means for imparting pulsating pressure changes to the gas filling said chamber.
Claim 10
Dependent Claim
40 words
The combination according to claim 7, in which said sensing means include a level sensing means communicating with the channel and located in a central chamber in the rotor, said gas filling being a gas cushion in the central chamber.
References Cited (Backward Citations)
US3167509A
Cited
US3301476A
Cited
US3396910A
Cited
US3408000A
Cited
US3410479A
Cited
US3445061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |