MULTISTAGE AIRCRAFT Russian patent published in 2001 - IPC

FIELD: hydraulic hoisting and transportation devices for discharge and transportation of hydraulic mixture over horizontal workings. SUBSTANCE: multistage airlift includes stages provided with vertical suction units located in liquid receivers, mixer, rising pipe, air duct and air separator with drain pipe at fall of 10 to 20%. Rising pipe of each stage is located at angle relative to axis of suction device not exceeding 60 deg. Mixer is made in form of perforated pipe located near rising pipe; it changes to converging nozzle with inner curvilinear helical grooves. Perforated pipe and nozzle are interconnected by means of bent clamp. End of rising pipe is provided with nozzle widening downward; it is provided with curvilinear helical guides. Arranged inside this nozzle is bimetallic polyhedron whose cross section has form of tetragon whose two opposite sides are parallel and two other sides are perpendicular to each other. Fitted at end of drain pipe is flexible perforated laid on bottom of liquid receiver. EFFECT: improved mixing of air with liquid being transported; enhanced operational efficiency. 5 dwg