MULTISTAGE AIR LIFT Russian patent published in 2004 - IPC

FIELD: mining industry. SUBSTANCE: invention relates to hydraulic lifts designed for transportation of hydraulic mixture along horizontal faces. Proposed multistage air lift contains stages arranged in tandem, each provided with vertical suction device arranged in liquid receiver, mixer arranged near lift pipe, air duct and air separator with drain pipe connected to receiver of following stage. Lift pipe of each stage is arranged at angle to axis of suction device not exceeding 60^o. Drain pipe has fall within 10 and 20%. Head with downwards widening curvilinear helical guides is installed on end of lift pipe. Bimetal polyhedron is provided inside head whose cross section is tetragon with two opposite sides made parallel, and two other sides square to each other. Flexible perforated ring is installed on end of drain pipe being placed on bottom of liquid receiver. Mixer is made in form of perforated member of semicylindrical shape. Suction device is arranged coaxially inside convergent nozzle. Convergent attachments with inner curvilinear helical jigs pointed to clearance between convergent nozzle and suction device are connected in tiers to inner surface of member. Said attachments are installed vertically within the limits of height of convergent nozzle. EFFECT: improved efficiency. 4 dwg