US3864256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter centrifuge and method of operating same
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1974-06-17
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Granted: 1975-02-04
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Expires: 1994-06-17
Abstract
Abstract A filter centrifuge wherein a drum is rotated about a central axis at high speed so as to drive the liquid phase of a liquidsolid suspension out through a filter medium has a liquidcollecting chamber radially outside of the filter medium and provided with an outlet from which the liquid passing through the filter cake is expelled. A venturi pump in the drum has a suction side connected to the liquid-collecting compartment radially inwardly of the outlet thereof so as to produce a negativepressure gas head that serves to draw air and any remaining liquid through the filter cake after most of the liquid phase has been drawn off. In addition during operation of the filter centrifuge this venturi pump, which may be driven by the liquid phase as it issues from the compartment or by a fluid fed especially into the drum for this purpose, serves to maintain a predetermined negative pressure in the compartment under the filter medium.
Inventors
- 👤 Gunther Hultsch
- 👤 Kurt Zeppenfeld
- 👤 Peter Niedner
- 👤 Peter Ostermeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:38
CPC Classifications
B; B04; B04B; B04B15/00; B04B15/08; B01; B01D; B01D33/00; B01D33/06; B01D33/11; B01D33/70; B01D33/74; B01D33/80; B01D33/82; B04B11/00; B04B11/02; B04B11/08; B04B11/082; B04B3/00; B04B3/04; B01D2201/00; B01D2201/20; B01D2201/204; B01D2201/206; B01D2201/208; B01D2201/28; B01D2201/282; Y; Y10; Y10S; Y10S494/00; Y10S494/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
108 words
A FILTER CENTRIFUGE COMPRISING: A HOUSING; A DRUM ROTATABLE IN SAID HOUSING AND FORMED WITH A SUPPORT FOR A FILTER MEDIUM CENTERED ON THE AXIS OF ROTATION OF THE DRUM AND ADAPTED TO ACCUMULATE A FILTER CAKE UPON INTRODUCTION OF A SUSPENSION OF SOLIDS IN A LIQUID PHASE INTO SAID DRUM; MEANS FORMING A LIQUID-COLLECTING COMPARTMENT OUTWARDLY OF SAID FILTER MEDIUM IN SAID DRUM AND PROVIDED WITH AT LEAST ONE OUTLET RADIALLY OUTWARD OF SAID FILTER MEDIUM; AND PUMP MEANS INCLUDING A VENTURI IN SAID DRUM HAVING A SUCTION CONDUIT OPENING INTO SAID COMPARTMENT AT A LOCATION RADIALLY INWARD OF SAID OUTLET FOR SUCKING AIR FROM SAID COMPARTMENT.
Claim 2
Dependent Claim
108 words
A FILTER CENTRIFUGE COMPRISING: A HOUSING; A DRUM ROTATABLE IN SAID HOUSING AND FORMED WITH A SUPPORT FOR A FILTER MEDIUM CENTERED ON THE AXIS OF ROTATION OF THE DRUM AND ADAPTED TO ACCUMULATE A FILTER CAKE UPON INTRODUCTION OF A SUSPENSION OF SOLIDS IN A LIQUID PHASE INTO SAID DRUM; MEANS FORMING A LIQUID-COLLECTING COMPARTMENT OUTWARDLY OF SAID FILTER MEDIUM IN SAID DRUM AND PROVIDED WITH AT LEAST ONE OUTLET RADIALLY OUTWARD OF SAID FILTER MEDIUM; AND PUMP MEANS INCLUDING A VENTURI IN SAID DRUM HAVING A SUCTION CONDUIT OPENING INTO SAID COMPARTMENT AT A LOCATION RADIALLY INWARD OF SAID OUTLET FOR SUCKING AIR FROM SAID COMPARTMENT.
Claim 3
Dependent Claim
39 words
The centrifuge defined in claim 1 wherein said venturi has an outlet conduit, a chamber tapered toward said outlet conduit and away from said suction conduit, and an inlet aperture directed past said suction conduit toward said outlet conduit.
Claim 4
Dependent Claim
27 words
The centrifuge defined in claim 2 wherein said drum is provided with a feed conduit connected to said inlet aperture connectable to a source of pumping fluid.
Claim 5
Dependent Claim
55 words
The centrifuge defined in claim 3 wherein said drum is formed with a liquid-holding chamber adjacent said compartment and communicating therewith through said outlet thereof, said centrifuge further comprising means for alternatively maintaining in said holding chamber a liquid level relative to said axis inward of said venturi chamber and outward of said venturi chamber.
Claim 6
Dependent Claim
35 words
The centrifuge defined in claim 4 wherein said drum is formed with a radially inwardly open reservoir adapted to receive pumping fluid and with at least one passage extending between said reservoir and said venturi.
Claim 7
Dependent Claim
38 words
The centrifuge defined in claim 2 wherein said outlet of said compartment is in fluid communication with said inlet conduit of said venturi, whereby said liquid phase issuing from said outlet is the pumping fluid for said venturi.
Claim 8
Dependent Claim
54 words
The centrifuge defined in claim 6 wherein said drum is provided with tubes having radially inner ends at said medium and radially outer ends projecting radially beyond the radially inner surface of said compartment, said suction conduit opening into said compartment at a location radially spaced between said outer ends and said inner surface.
Claim 9
Dependent Claim
27 words
The centrifuge defined in claim 7, further comprising means for introducing air into said compartment at a location radially between said outer ends and said inner surface.
Claim 10
Independent Claim
124 words
A method of operating a filter centrifuge having a centrifuge drum rotatable about an axis and having a filter medium upon which a filter cake is adapted to form from the solid phase of a liquid-solid suspension, said method comprising the steps of: rotating said drum at a rate sufficient to induce passage of the liquid phase of said suspension outwardly through said medium into a liquid-collecting compartment therearound while allowing said liquid phase to issue from said compartment through an outlet radially outward of said medium; applying at said filter medium a hydrostatic pressure head controlling the passage of said liquid phase through said filter medium; and simultaneously applying suction to said chamber via a venturi pump location radially inward of said outlet.
Claim 11
Independent Claim
124 words
A method of operating a filter centrifuge having a centrifuge drum rotatable about an axis and having a filter medium upon which a filter cake is adapted to form from the solid phase of a liquid-solid suspension, said method comprising the steps of: rotating said drum at a rate sufficient to induce passage of the liquid phase of said suspension outwardly through said medium into a liquid-collecting compartment therearound while allowing said liquid phase to issue from said compartment through an outlet radially outward of said medium; applying at said filter medium a hydrostatic pressure head controlling the passage of said liquid phase through said filter medium; and simultaneously applying suction to said chamber via a venturi pump location radially inward of said outlet.
Claim 12
Dependent Claim
23 words
The method defined in claim 9, further comprising the step of introducing air into said compartment to create a negative-pressure gas head therein.
Claim 13
Dependent Claim
27 words
The method defined in claim 10 wherein said liquid phase is passed through a venturi pump having a suction side connected to said compartment at said location.
Claim 14
Dependent Claim
40 words
The method defined in claim 9, further comprising the step of applying suction to said compartment at said location after most of said liquid phase has passed through said filter medium to draw air through said cake and dry same.
Claim 15
Dependent Claim
38 words
The method defined in claim 12 wherein said suction is applied to said compartment by centrifugally forcing a stream of liquid through a venturi in said drum having a suction side connected to said compartment at said location.
Claim 16
Dependent Claim
83 words
The method defined in claim 12, further comprising the steps of: flowing said liquid phase from said outlet into a holding chamber on said drum adjacent said compartment; maintaining the liquid level in said chamber radially inward of said venturi pump until most of said liquid phase has passed through said filter medium and radially outwardly of said venturi pump when most of said liquid phase has passed through said filtering medium, said ventuRi pump having an outlet side opening into said chamber.
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |