Patent US4784633A successfully refreshed from Google Patents.
US4784633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuge with a drum having solids-extraction openings
Assignee: GEA Mechanical Equipment GmbH
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Filing: 1987-04-07
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Granted: 1988-11-15
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Expires: 2007-04-07
Abstract
Abstract A centrifuge drum is provided with a seal consisting of a narrow gap between the drum and centrifuge housing. The seal is located between the actual housing and the solids catch chamber. There is a pressure-compensation space at the drum in the vicinity of the seal. The exchange of air that occurs at the seal in a centrifuge without the compensation space between the solids catch chamber and the housing in accordance with the invention and that leads to deposits of solids in the housing is accordingly displaced into the compensation space.
Inventors
- 👤 Paul Bruning
- 👤 Helmut Figgener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
In a centrifuge including a rotatable drum having an axis of rotation and solids extraction openings, a stationary housing surrounding the drum and having a solids catch chamber in the vicinity of the openings, at least one seal in the catch chamber comprising means forming an annular gap between the housing and drum including a radially extending surface on the housing and a radially extending demarcating disk on the drum, the improvement comprising means forming a pressure compensation space in the vicinity of the at least one seal and between the demarcating disk and the radially extending housing surface including the demarcating disk having a radially outer surface extending outwardly from the drum at an acute angle to the axis of rotation.
Claim 2
Dependent Claim
122 words
In a centrifuge including a rotatable drum having an axis of rotation and solids extraction openings, a stationary housing surrounding the drum and having a solids catch chamber in the vicinity of the openings, at least one seal in the catch chamber comprising means forming an annular gap between the housing and drum including a radially extending surface on the housing and a radially extending demarcating disk on the drum, the improvement comprising means forming a pressure compensation space in the vicinity of the at least one seal and between the demarcating disk and the radially extending housing surface including the demarcating disk having a radially outer surface extending outwardly from the drum at an acute angle to the axis of rotation.
Claim 3
Dependent Claim
15 words
The centrifuge as in claim 1, wherein the acute angle is preferably at least 40°.
Claim 4
Dependent Claim
38 words
The centrifuge as in claim 1, wherein the pressure compensation space is disposed radially inwardly of the gap and has a flow cross-section at the gap which is precisely equal to the flow cross-section of the annular gap.
Claim 5
Dependent Claim
16 words
The centrifuge as in claim 1, wherein the demarcating disk is detachably connected to the drum.
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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |