SCREW EXTRACTOR FOR RAW PLANT MATERIAL Russian patent published in 1997 - IPC

FIELD: extraction of raw plant material by aqueous-alcoholic solution. SUBSTANCE: extractor has horizontal cylindrical housing with charging and discharge openings and perforated portion, charging hopper with feeder connected to housing charging opening, hollow annular extract collector, which embraces perforated portion, locking cone positioned for axial movement in discharge opening of housing, hollow drive screw mounted in housing and provided with perforated portion positioned between charging opening and perforated portion of housing. Collector is communicated through branch pipes with housing cavity at location between charging opening and perforated portion and with alcohol source. Water source is communicated with screw cavity through feeding pipe having perforated portion, with perforations of feeding pipe being positioned in common planes with perforations of screw in axial circles at unequal and aliquant pitch and provided with swirlers. Swirlers are also mounted in branch pipes. Perforations of screw and outlets of branch pipes are made in the form of Laval nozzles. EFFECT: increased efficiency, simplified construction and improved quality of extracted material. 4 dwg