US4381849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solids-liquid slurry separating centrifuge
Assignee: Baker Hughes Holdings LLC
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Filing: 1981-06-29
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Granted: 1983-05-03
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Expires: 2001-06-29
Abstract
Abstract A solids-liquid slurry separating centrifuge has a rotary bowl, a conveyor rotatable coaxially therein, an outlet for solids, and a liquids outlet permitting retention in the bowl of a pool of slurry with an inner surface at or close to the axis of the bowl. Mechanism for discharging solids from the solids outlet includes a frusto-conical inner portion of the bowl and a coaxial frusto-conical hub on the conveyor within it having their smaller ends at the solids outlet, the hub being formed to a larger cone angle than the bowl portion such that the outlet end of the passage between them is wider than its inlet end and is approximately equal in cross-sectional area to the passage inlet. The hub has a conveyor blade helix of diminishing spacing between turns from the larger diameter end toward the smaller diameter end of the passage.
Inventors
- 👤 Lawrence D. Conant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/20; B04B1/2016
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
238 words
In a solids-liquid separating centrifuge having a rotary bowl, a rotary conveyor mounted coaxially therein, means for rotating said bowl and conveyor about their common axis in the same direction at a differential speed, means for feeding a solids liquid slurry into said bowl, an outlet for solids at an end portion of said bowl, and a separate outlet for liquid from said bowl constructed and arranged to permit the formation in said bowl of a pool of said slurry having its surface at least approximately as close to the bowl axis as said solids outlet; solids discharge mechanism for discharging solids through said bowl end portion to said solids outlet comprising a frusto-conical interior in said bowl end portion having its smaller diameter end at said solids outlet, a frusto-conical, helically bladed hub on said conveyor located coaxially within, and extending substantially the full length of, said frusto-conical interior and having a larger cone angle such as to define with said interior a frusto-conical passage which, at its smaller diameter end, is wider than at its larger diameter end and is approximately equal in cross-sectional area to its larger diameter end, said hub being helically bladed by at least one helically extending blade mounted on said hub to define a helix which has a diminishing spacing between successive turns thereof about said common axis from the larger diameter end toward the smaller diameter end of said passage.
Claim 2
Dependent Claim
238 words
In a solids-liquid separating centrifuge having a rotary bowl, a rotary conveyor mounted coaxially therein, means for rotating said bowl and conveyor about their common axis in the same direction at a differential speed, means for feeding a solids liquid slurry into said bowl, an outlet for solids at an end portion of said bowl, and a separate outlet for liquid from said bowl constructed and arranged to permit the formation in said bowl of a pool of said slurry having its surface at least approximately as close to the bowl axis as said solids outlet; solids discharge mechanism for discharging solids through said bowl end portion to said solids outlet comprising a frusto-conical interior in said bowl end portion having its smaller diameter end at said solids outlet, a frusto-conical, helically bladed hub on said conveyor located coaxially within, and extending substantially the full length of, said frusto-conical interior and having a larger cone angle such as to define with said interior a frusto-conical passage which, at its smaller diameter end, is wider than at its larger diameter end and is approximately equal in cross-sectional area to its larger diameter end, said hub being helically bladed by at least one helically extending blade mounted on said hub to define a helix which has a diminishing spacing between successive turns thereof about said common axis from the larger diameter end toward the smaller diameter end of said passage.
Claim 3
Dependent Claim
29 words
A centrifuge according to claim 1 wherein the tangent angle of said helix to the generatrix of one of the two opposite walls of said passage is substantially constant.
Claim 4
Dependent Claim
21 words
A centrifuge according to claim 2 wherein the cross-sectional area and volume between adjacent turns of said helix are substantially constant.
Claim 5
Dependent Claim
23 words
A centrifuge according to claim 1 wherein the cone angle of the exterior wall of said passage is between about 3° and 20°.
Claim 6
Dependent Claim
16 words
A centrifuge according to claim 4 wherein said cone angle is between about 7° and 16°.
Claim 7
Dependent Claim
24 words
A centrifuge according to any of claims 1 to 5 wherein said helix forms a continuation of a preceding bladed helix on said conveyor.
Claim 8
Dependent Claim
14 words
A centrifuge according to claim 6 wherein said preceding bladed helix is generally cylindrical.
Claim 9
Dependent Claim
37 words
A centrifuge according to any of claims 1 to 5 wherein means are provided for adjustably varying the rate of rotation of said hub relative to that of said bowl end portion while the centrifuge is operating.
References Cited (Backward Citations)
US775320A
Cited
US2867378A
Cited
US3143504A
Cited
US3379368A
Cited
US3734399A
Cited
US4303192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |