Patent US3770131A successfully refreshed from Google Patents.
US3770131A
Expired / Lapsed
US
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Feedwell
Assignee: Envirotech Corp
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Filing: 1971-10-20
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Granted: 1973-11-06
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Expires: 1991-10-20
Abstract
Abstract A tubular feedwell is centrally located in a sedimentation pool and the feedwell wall is provided with a plurality of elongated passages through which influent passes from the interior of the feedwell into the surrounding sedimentation pool.
Inventors
- 👤 S Davis
- 👤 S Cottam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:09
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/24; B01D21/2405; B01D21/2416; B01D21/0006; B01D21/02; B01D21/04; B01D21/06; B01D21/2427; B01D21/245
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
191 words
In a sedimentation device which includes an open tank defined by a bottom and marginal sidewalls for containing a sedimentation pool, influent means for delivering liquid feed centrally into the tank, sediment discharge means adjacent the bottom for discharging settled material therefrom, and effluent discharge means located at the periphery of said tank, an improved feedwell comprising: a. a wall which is mounted generally centrally within the tank and which defines an enclosed space for receiving liquid feed from said influent means, said wall having generally regularly spaced-apart openings formed therethrough, a bottom closure member connected to the lower edge of side wall; b. conduit banks comprising a multipicity of straight conduits which are relatively short relative to the radius of the tank, arranged side by side and mounted in each of said openings with said conduits directed generally radially outwards relative to the tank to provide liquid flow communication between the interior of the feedwell and the interior of said tank and to convey the influent liquid into the tank in a generally radially uniform flow; and c. a solids discharge outlet in said bottom closure member of said feedwell.
Claim 2
Dependent Claim
191 words
In a sedimentation device which includes an open tank defined by a bottom and marginal sidewalls for containing a sedimentation pool, influent means for delivering liquid feed centrally into the tank, sediment discharge means adjacent the bottom for discharging settled material therefrom, and effluent discharge means located at the periphery of said tank, an improved feedwell comprising: a. a wall which is mounted generally centrally within the tank and which defines an enclosed space for receiving liquid feed from said influent means, said wall having generally regularly spaced-apart openings formed therethrough, a bottom closure member connected to the lower edge of side wall; b. conduit banks comprising a multipicity of straight conduits which are relatively short relative to the radius of the tank, arranged side by side and mounted in each of said openings with said conduits directed generally radially outwards relative to the tank to provide liquid flow communication between the interior of the feedwell and the interior of said tank and to convey the influent liquid into the tank in a generally radially uniform flow; and c. a solids discharge outlet in said bottom closure member of said feedwell.
Claim 3
Dependent Claim
32 words
The feedwell according to claim 1 wherein said solids discharge outlet comprises apertures formed through said bottom closure member so that feed solids which settle within the feedwell are discharged downward therefrom.
Claim 4
Dependent Claim
20 words
The feedwell according to claim 2 including rake means to urge solids toward said apertures in said bottom closure member.
Claim 5
Dependent Claim
40 words
The feedwell according to claim 1 wherein said bottom closure member is sloped from its center downwardly, and a generally peripheral gap is formed between the peripheral edge of said bottom closure member and the lower edge of said wall.
Claim 6
Dependent Claim
27 words
The feedwell according to claim 4 in which the total open area of said gap is less than the total open cross sectional area of said conduits.
Claim 7
Dependent Claim
15 words
The feedwell according to claim 5 including rake means to urge solids toward said gap.
Claim 8
Dependent Claim
21 words
The feedwell according to claim 1 wherein said conduits have a length to diameter ratio of at least 6.5 to 1.
Claim 9
Dependent Claim
35 words
The feedwell according to claim 1 including individual frames over said openings, said frames supporting said multiplicity of conduits so that said conduits are mounted in fluid flow relationship over said openings in said wall.
Claim 10
Dependent Claim
29 words
The feedwell according to claim 8 including mounting means to enable selective rotation of said individual frames to reverse the direction of the flow of liquid through said conduits.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |