US5067939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyorless clarifier
Assignee: Bird Machine Co Inc
•
Filing: 1990-03-21
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Granted: 1991-11-26
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Expires: 2010-03-21
Abstract
Abstract A rotating bowl decanter centrifuge including a clarifier section and a beach section for separating a lighter phase from a heavier phase. The beach section includes a conveyor for conveying the heavier phase toward the exterior of the centrifuge. The centrifuge is without a conveyor in the effluent discharge end of the clarifier section. In a preferred embodiment, the clarifier section has an outward incline angle so that the clarifier wall bends away from the bowl's rotational axis. The beach section includes an inwardly inclined outer wall which bends towards the rotational axis of the bowl. It is preferred that the outward incline angle in the clarifier section be on the order of 5° or less.
Inventors
- 👤 Ascher H. Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:08
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/20
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
183 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a first portion without the conveyor from said effluent discharge end part way to said beach section, and having a second portion with the conveyor in the remaining portion of the clarifier adjacent to the beach section, and said outer wall of said clarifier having in the part without the conveyor an outward incline angle, Φ, sufficient to cause the heavier phase to be moved by centrifugal force along said wall to said beach section.
Claim 2
Dependent Claim
183 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a first portion without the conveyor from said effluent discharge end part way to said beach section, and having a second portion with the conveyor in the remaining portion of the clarifier adjacent to the beach section, and said outer wall of said clarifier having in the part without the conveyor an outward incline angle, Φ, sufficient to cause the heavier phase to be moved by centrifugal force along said wall to said beach section.
Claim 3
Dependent Claim
20 words
The centrifuge of claim 1 wherein the clarifier section has the conveyor in the last fifty percent of clarifier length.
Claim 4
Dependent Claim
20 words
The centrifuge of claim 1 wherein the clarifier section has the conveyor in the last thirty percent of clarifier length.
Claim 5
Dependent Claim
147 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a portion without a conveyor from said effluent discharge end at least part way to said beach section, said outer wall of said clarifier having in the portion without the conveyor an outward incline angle, Φ, less than 5°.
Claim 6
Dependent Claim
147 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a portion without a conveyor from said effluent discharge end at least part way to said beach section, said outer wall of said clarifier having in the portion without the conveyor an outward incline angle, Φ, less than 5°.
Claim 7
Dependent Claim
14 words
The centrifuge of claim 4 wherein the incline angle, Φ, is less than 3°.
Claim 8
Dependent Claim
20 words
The centrifuge of claim 5 wherein the clarifier section has the conveyor in the last fifty percent of clarifier length.
Claim 9
Dependent Claim
20 words
The centrifuge of claim 5 wherein the clarifier section has the conveyor in the last thirty percent of clarifier length.
Claim 10
Dependent Claim
14 words
The centrifuge of claim 5 wherein the clarifier section is fully without the conveyor.
Claim 11
Dependent Claim
14 words
The centrifuge of claim 5 wherein the incline angle, Φ, is less than 1°.
Claim 12
Dependent Claim
12 words
The centrifuge of claim 5 wherein the incline angle, Φ, is 0°.
Claim 13
Dependent Claim
32 words
The centrifuge of any one of claims 1-10 wherein the conveyorless portion of the clarifier has a rake with elements extending into the heavier phase for promoting fluidity of the heavier phase.
Claim 14
Dependent Claim
44 words
The centrifuge of claim 5 wherein said clarifier section, in operation, creates an interface between the heavier and lighter phases which is outwardly inclined by an angle, Φ eff , greater than 0° to promote movement of the heavier phase toward the beach section.
Claim 15
Dependent Claim
20 words
The clarifier of claim 12 wherein said incline angle, Φ, of said outer wall of said clarifier section is 0°.
Claim 16
Dependent Claim
151 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a portion without the conveyor from said effluent discharge end at least part way to said beach section, said conveyorless portion of said clarifier having one or more rakes with elements extending into the heavier phase for promoting fluidity of the heavier phase.
Claim 17
Dependent Claim
151 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a portion without the conveyor from said effluent discharge end at least part way to said beach section, said conveyorless portion of said clarifier having one or more rakes with elements extending into the heavier phase for promoting fluidity of the heavier phase.
Claim 18
Dependent Claim
19 words
The centrifuge of claim 14 wherein the clarifier has the conveyor in the last fifty percent of clarifier length.
Claim 19
Dependent Claim
19 words
The centrifuge of claim 14 wherein the clarifier has the conveyor in the last thirty percent of clarifier length.
Claim 20
Dependent Claim
13 words
The centrifuge of claim 14 wherein the clarifier is fully without the conveyor.
Claim 21
Dependent Claim
44 words
The centrifuge of claim 14 wherein said clarifier section, in operation, creates an interface between the heavier and lighter phases which is outwardly inclined by an angle, Φ eff , greater than 0° to promote movement of the heavier phase toward the beach section.
Claim 22
Dependent Claim
21 words
The centrifuge of claim 14 wherein said elements are attached to an axial shaft and rotated at the conveyor rotational velocity.
Claim 23
Dependent Claim
165 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a portion without the conveyor from said effluent discharge end at least part way to said beach section, and said centrifuge being configured to create an interface between the heavier and lighter phases that is outwardly inclined by an angle, Φ eff , greater than 0° to promote movement of the heavier phase toward the beach section.
Claim 24
Dependent Claim
165 words
A rotating bowl decanter centrifuge for continuous operation for separating a lighter phase from a heavier phase, said centrifuge comprising a clarifier section in which the heavier phase is separated from the lighter phase, said clarifier section having an effluent discharge end at which said lighter phase is discharged and an outer wall on which said heavier phase is deposited, a beach section downstream of said clarifier section, said beach section receiving the heavier phase from said clarifier and having an inwardly inclined outer wall as well as a conveyor for conveying the heavier phase toward the heavier phase discharge end of the centrifuge, said clarifier section having a portion without the conveyor from said effluent discharge end at least part way to said beach section, and said centrifuge being configured to create an interface between the heavier and lighter phases that is outwardly inclined by an angle, Φ eff , greater than 0° to promote movement of the heavier phase toward the beach section.
Claim 25
Dependent Claim
19 words
The centrifuge of claim 20 wherein the clarifier has the conveyor in the last fifty percent of clarifier length.
Claim 26
Dependent Claim
19 words
The centrifuge of claim 20 wherein the clarifier has the conveyor in the last thirty percent of clarifier length.
Claim 27
Dependent Claim
13 words
The centrifuge of claim 20 wherein the clarifier is fully without the conveyor.
References Cited (Backward Citations)
US631680A
Cited
US2593278A
Cited
US3423016A
Cited
SU439301A1
Cited
US3814307A
Cited
US4037781A
Cited
US4027820A
Cited
SU614803A1
Cited
US4240578A
Cited
SU747532A1
Cited
US4303192A
Cited
US4339072A
Cited
SU891570A1
Cited
US4530691A
Cited
US4642186A
Cited
US4714456A
Cited
GB2182869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |