Presses – With drain means for expressed liquid – Drainage through or along pressure surface
Patent
1974-06-10
1976-02-17
Feldman, Peter
Presses
With drain means for expressed liquid
Drainage through or along pressure surface
100 90, 100112, 100145, 210225, B30B 914
Patent
active
039384349
ABSTRACT:
A filter-dewatering-expression apparatus. Rotating helical blades of a screw conveyor compress and squeeze liquid from the sludge within structure which permits the liquid to escape therefrom, and discharge the dewatered solids out the end. The filter-dewatering medium which is held rigid by a frame may be a series of hoops or rings, separated and closely spaced, or may be a continuous wire, semicircular in cross section, closely wound into a coil, or may be a perforated screen. An imperforate filtrate collection housing surrounds this medium, and a vacuum pump is connected to the filtrate housing. A coil-spring wiping or cleaning blade may be held on the outside edge of the helical blade of the screw conveyor for continuous contact with the inside surface of the filter-dewatering medium, cleaning solids therefrom. Cleaning nozzles project out radially from the outer edge of the helical blades of the screw conveyor, spaced to discharge under pressure, a forceful blast of the air or other gas, steam, or water into the open area of the medium, to positively dislodge material therein and keep the medium unplugged, non-blinded, clean, and open. Air or steam may be added to the sludge within the structure by ports located in the screw conveyor shaft. A removable spiral shaft wrap may be rotated over and wound around, covering the screw conveyor shaft within the structure, threading the helical blade, to vary the inside configuration of the dewatering press. A plural-section screw conveyor may be utilized within the press, each section being capable of being rotated at different speeds of rotation.
REFERENCES:
patent: 643891 (1900-02-01), Bussells
patent: 793267 (1905-06-01), Barth
patent: 808193 (1905-12-01), Bussells
patent: 1333249 (1920-03-01), Fiddyment
patent: 1876064 (1932-09-01), Lang
patent: 2355091 (1944-08-01), McDonald
patent: 2436064 (1948-02-01), Crosby
patent: 3126818 (1964-03-01), Koelsch
patent: 3188942 (1965-06-01), Wandel
patent: 3695173 (1972-10-01), Cox
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