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US 5,341,936 AGranted
Screening device for a fiber slurry, and a backwash means therefor
AssigneeIngersoll-Rand Company
InventorDouglas L. G. Young
Life of this patent
Estimating the term…
Abstract
A hydrofoil in close proximity to an outboard surface of a rotatable slurry screen, and a hydrofoil in close proximity to an inboard surface of the screen, cooperate to create high and low slurry pressures at the surfaces which result in causing the slurry to surge through the screen to backwash the latter, thereby dislodging slurry-borne substances which tend to clog apertures in the screen.
Claims12
A screening device for a fiber slurry, comprising:
- a screen having first and second opposite surfaces;
- first means, mounted in an adjacency to one of said screen surfaces, for causing slurry to surge through said screen from said one surface and exit onto the other of said surfaces;
- and
- second means, mounted in an adjacency to said other surface, for causing slurry to surge through said screen from said other surface for exiting thereof onto said one surface;
- and wherein
- said first and second means are in juxtaposition, and straddle said screen therebetween;
- and
- said first means further comprises means for causing said slurry to impinge against said second means.
5 more elements
A screening device for a fiber slurry, comprising:
- a screen having first and second opposite surfaces;
- and
- an elongate hydrofoil mounted in proximate adjacency to one of said screen surfaces for causing slurry to surge through said screen, from said hydrofoil and said one surface, and exit onto the other of said surfaces, wherein said hydrofoil has (a) a given width, (b) a relief formed therein through approximately half of said given width, and (c) a termination of said relief which defines a wall, and said wall extends substantially normal to said one surface and extends throughout the full length of said hydrofoil.
Backwash means, for a screening device for a fiber slurry, comprising:
- an elongate hydrofoil for mounting thereof in proximate adjacency to a fiber slurry screen of a screening device, wherein said hydrofoil has means formed thereon, and extending the full length thereof, defining a barrier to slurry flow therealong, and for causing slurry to flow away form sad hydrofoil, in a direction substantially normal to said hydrofoil.
A screening device for a fiber slurry, comprising:
- first means comprising a screen for screening fiber slurry;
- second means comprising a backwash generator, mounted in adjacency to said screen, for causing slurry to backwash through said screen;
- and
- means coupled to one of said first and second means for causing relative movement between said first and second means;
- wherein
- said screen has first and second, opposite surfaces;
- and
- said backwash generator comprises means disposed in juxtaposition adjacent to said opposite surfaces and straddling said screen for causing slurry to surge through said screen form said first surface to said second surface ad to impinge against a portion of said generator, and from said second surface to said first surface.
5 more elements
Dependencies are inferred from the claim text.