Fluidizing detrashing impeller

Details Fluidizing detrashing impeller Fluidizing detrashing impeller

1997-11-03

2000-01-04

Walsh, Donald P.

Classifying, separating, and assorting solids

Sifting

Drum sifters

209305, 209273, 210456, 162 4, B07B 104, B01D 120, D21B 2124, D21B 108

Patent

active

060100125

ABSTRACT:
A de-trashing unit has a rotor fabricated from steel blank. The rotor has two swept blades with blunt leading edges and relieved trailing edges. The rotor is driven to rotate over a trash screen with holes of between one-quarter and one-half inch in diameter. The blade is positioned with a clearance between the blade and the screen of between 0.005 and 0.010 inches. The relieved portions of the blades face the screen while the trailing edges of the blade are tapered between 18 and 30 degrees away from the screen surface. The blade taper creates a strong negative pressure pulse which keeps the screen clear. Holes drilled through the relieved portion of the blade allow circulation through the blade into the region of low pressure generated by the relieved portions passing over the screen. The circulation created by the holes creates microturbulence which keeps a water and paper fiber slurry fluidized.

REFERENCES:
patent: 3009656 (1961-11-01), Martindale
patent: 3953325 (1976-04-01), Nelson
patent: 4604193 (1986-08-01), Lamort
patent: 4919797 (1990-04-01), Chupka et al.
patent: 5476178 (1995-12-01), Lamor
patent: 5645724 (1997-07-01), Lamor
patent: 5798025 (1998-08-01), Iwashige

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