US4496340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw centrifuge with a washing device
Assignee: Bayer AG
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Filing: 1983-04-19
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Granted: 1985-01-29
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Expires: 2003-04-19
Abstract
Abstract The screw centrifuge has a cylindrical clarifying part and a conical desiccating part which is provided with axial supply pipes for a washing liquid and with openings for the passage of the washing liquid into the chamber between the drum and the screw core. A substantial improvement in the washing effect is achieved in that the openings are connected to a liquid distributor which is positioned along a cylindrical helix and which charges the washing liquid regularly along the screw flank over at least one turn in the vicinity of the screw core. The liquid distributor either comprises an overflow channel which is positioned in or directly upstream of the screw flank, or it is formed from a compact series of nozzles which are directed at the screw flank. It is an essential feature of this arrangement that the solids which are pushed up by the screw flanks are covered and saturated regularly with the washing liquid.
Inventors
- 👤 Detmar Redeker
- 👤 Dieter Mrotzek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:46
CPC Classifications
B; B04; B04B; B04B15/00; B04B15/12; B04B1/00; B04B1/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
123 words
In a screw centrifuge having a drum and a screw core forming a cylindrical clarifying part and a conical desiccating part, an axial supply pipe into the screw core for a washing liquid and openings in the screw core for the passage of the washing liquid into a chamber between the drum and the screw core, the improvement comprising: liquid distributing means in communication with the openings and positioned around the screw core axis along a cylindrical helix for regularly distributing the washing liquid along the screw flank over at least one turn in the vicinity of the screw core, wherein the liquid distributing means comprises an overflow channel having a weir and wherein the overflow channel is positioned in the screw flank.
Claim 2
Dependent Claim
123 words
In a screw centrifuge having a drum and a screw core forming a cylindrical clarifying part and a conical desiccating part, an axial supply pipe into the screw core for a washing liquid and openings in the screw core for the passage of the washing liquid into a chamber between the drum and the screw core, the improvement comprising: liquid distributing means in communication with the openings and positioned around the screw core axis along a cylindrical helix for regularly distributing the washing liquid along the screw flank over at least one turn in the vicinity of the screw core, wherein the liquid distributing means comprises an overflow channel having a weir and wherein the overflow channel is positioned in the screw flank.
Claim 3
Dependent Claim
22 words
The screw centrifuge according to claim 1, wherein at least one of the overflow channel and the weir is sub-divided into segments
Claim 4
Dependent Claim
14 words
The screw centrifuge according to claim 1, wherein the weir has a jagged configuration.
Claim 5
Dependent Claim
22 words
The screw centrifuge according to claim 1, wherein the liquid distributing means further comprises axially-parallel driving ridges inserted into the overflow channel.
Claim 6
Dependent Claim
143 words
In a screw centrifuge having a drum and a screw core forming a cylindrical clarifying part and a conical desiccating part, an axial supply pipe into the screw core for a washing liquid and openings in the screw core for the passage of the washing liquid into a chamber between the drum and the screw core, the improvement comprising: liquid distributing means in communication with the openings and positioned around the screw core axis along a cylindrical helix for regularly distributing the washing liquid along the screw flank over at least one turn in the vicinity of the screw core, wherein the liquid distributing means comprises a compact series of nozzles positioned along a helix and directly upstream of the screw flank and which are directed at the screw flank to spray onto the joining line of the screw flank and screw core.
Claim 7
Dependent Claim
143 words
In a screw centrifuge having a drum and a screw core forming a cylindrical clarifying part and a conical desiccating part, an axial supply pipe into the screw core for a washing liquid and openings in the screw core for the passage of the washing liquid into a chamber between the drum and the screw core, the improvement comprising: liquid distributing means in communication with the openings and positioned around the screw core axis along a cylindrical helix for regularly distributing the washing liquid along the screw flank over at least one turn in the vicinity of the screw core, wherein the liquid distributing means comprises a compact series of nozzles positioned along a helix and directly upstream of the screw flank and which are directed at the screw flank to spray onto the joining line of the screw flank and screw core.
Claim 8
Dependent Claim
34 words
The screw centrifuge according to claim 5, wherein the liquid distributing means comprises an overflow channel and the openings to the overflow channel in the screw core are aligned on the same internal diameter.
Claim 9
Dependent Claim
16 words
The screw centrifuge according to claim 5, wherein the compact series of nozzles comprise wide-jet pipes
Claim 10
Dependent Claim
125 words
In a screw centrifuge having a drum and a screw core forming a cylindrical clarifying part and a conical desiccating part, an axial supply pipe into the screw core for a washing liquid and openings in the screw core for the passage of the washing liquid into a chamber between the drum and the screw core, the improvement comprising: liquid distributing means in communication with the openings and positioned around the screw core axis along a cylindrical helix for regularly distributing the washing liquid along the screw flank over at least one turn in the vicinity of the screw core, wherein the liquid distributing means comprises an overflow channel having a weir and wherein the overflow channel is positioned directly upstream of the screw flank.
Claim 11
Dependent Claim
125 words
In a screw centrifuge having a drum and a screw core forming a cylindrical clarifying part and a conical desiccating part, an axial supply pipe into the screw core for a washing liquid and openings in the screw core for the passage of the washing liquid into a chamber between the drum and the screw core, the improvement comprising: liquid distributing means in communication with the openings and positioned around the screw core axis along a cylindrical helix for regularly distributing the washing liquid along the screw flank over at least one turn in the vicinity of the screw core, wherein the liquid distributing means comprises an overflow channel having a weir and wherein the overflow channel is positioned directly upstream of the screw flank.
Claim 12
Dependent Claim
22 words
The screw centrifuge according to claim 8, wherein at least one of the overflow channel and the weir is sub-divided into segments.
Claim 13
Dependent Claim
14 words
The screw centrifuge according to claim 8, wherein the weir has a jagged configuration.
Claim 14
Dependent Claim
23 words
The screw centrifuge according to claim 8, wherein the liquid distributing means further comprises axially parallel driving ridges inserted into the overflow channel.
References Cited (Backward Citations)
US3348767A
Cited
US3971509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |