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US4130478A Expired / Lapsed US ⏱️ 0.0 years remaining

Bowl shaped screening apparatus

Assignee: Sweco Inc
•
Filing: 1977-08-25
•
Granted: 1978-12-19
•
Expires: 1997-08-25
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Abstract

Abstract An apparatus having a bowl-shaped screen with a large opening at the upper end thereof and a smaller opening at the lower end thereof for screening annularly distributed influent. An influent manifold is located above the screen to distribute influent downwardly into the upper opening. An effluent receiver is positioned about the screen while a concentrate receiver is positioned below the lower opening of the screen. A distributor cone is positioned in the upper opening to direct influent outwardly and downwardly to the screen. The cone is vertically adjustable to vary the size of the annular opening between the cone and the screen. The cone is also rotatably mounted to aid in uniformity of distribution. A tangential influent feed is employed to induce rotation of the distribution cone. A rotatably mounted backspray manifold extends about the screen with nozzles directed to induce rotation of the manifold. A wiper blade extending to the lower opening of the screen is attached to the backspray manifold for inducing concentrate into the concentrate receiver.

Inventors

  • 👤 Douglas M. Swallow

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 09:20
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/06; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/25; B01D29/44; B01D29/46; B01D29/62; B01D29/64; B01D29/6469; B01D29/6476; B01D29/66; B01D29/68; B01D29/682; B01D29/88; B01D29/90; B01D29/902; B01D29/908; B01D2201/00; B01D2201/08; B01D2201/081; B01D2201/084; B01D2201/58; B01D2201/583

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 167 words
A screening apparatus having a support structure, a stationary screen fixedly mounted in said support structure, said screen being bowl-shaped with a first opening centrally located at the upper end thereof and a second, smaller opening centrally located at the lower end thereof, an influent passage located near the top of said support structure, an effluent receiver about said screen and a concentrate receiver below said second opening; wherein the improvement comprises, in combination, an influent manifold having an annular channel, a tangential inlet for said influent passage and an inner wall defining one side of said annular channel and extending to an edge over which influent can flow towards said screen; a distributor cone mounted to said support structure and positioned in said first opening to receive influent from said influent manifold and distribute the influent outwardly and downwardly to said screen, said distributor cone extending to near said screen forming an annular orifice therebetween; and means for rotatably mounting said cone to said support structure.
Claim 2
Dependent Claim 167 words
A screening apparatus having a support structure, a stationary screen fixedly mounted in said support structure, said screen being bowl-shaped with a first opening centrally located at the upper end thereof and a second, smaller opening centrally located at the lower end thereof, an influent passage located near the top of said support structure, an effluent receiver about said screen and a concentrate receiver below said second opening; wherein the improvement comprises, in combination, an influent manifold having an annular channel, a tangential inlet for said influent passage and an inner wall defining one side of said annular channel and extending to an edge over which influent can flow towards said screen; a distributor cone mounted to said support structure and positioned in said first opening to receive influent from said influent manifold and distribute the influent outwardly and downwardly to said screen, said distributor cone extending to near said screen forming an annular orifice therebetween; and means for rotatably mounting said cone to said support structure.
Claim 3
Dependent Claim 33 words
The screening apparatus of claim 1 wherein said distributor cone includes vanes thereon which are positioned such that influent from said influent manifold can impinge on said vanes to rotate said distributor cone.
Claim 4
Dependent Claim 75 words
The screening apparatus of claim 1 further including a backspray manifold rotatably mounted relative to said support structure and extending upwardly about said screen on the exterior thereof, nozzles on said backspray manifold directed to provide a tangential component of flow therefrom to induce rotation of said backspray manifold, and a wiper attached to said backspray manifold to rotate therewith, said wiper extending through said second opening to wipe the lower portion of said screen.

References Cited (Backward Citations)

CA678037A Cited
US1669029A Cited
US1675612A Cited
US2367961A Cited
US2857053A Cited
US3081873A Cited
US3501002A Cited
US3511374A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-12-18 1982-06-19 1982-12-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-12-18 1986-06-19 1986-12-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-12-18 1990-06-19 1990-12-19 $7700.00 Window Closed / Lapsed

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