MULTI-STAGE AIR LIFT Russian patent published in 2012 - IPC F04F1/18 

FIELD: mining.

SUBSTANCE: air lift includes in-series located stages each of which has vertical suction device 2, arranged in fluid receiver, mixer, lifting pipe 4, air duct 5 and air separator with drain pipe connected to receiver of the next stage. Mixer is made in the form of perforated pipe 9 located near pipe 4 changed into convergent nozzle 11 with inner curved grooves 12 connected by means of clamp 10. On pipe 4 end there installed is downward divergent head piece 13 with curved screw-shaped guides 14, and inside it there provided is bimetallic polyhedron 15. Grooves 12 in nozzle 11 have direction of tangent in clockwise movement direction, and guides 14 on inner surface of head piece 13 have counter-clockwise direction of tangent.

EFFECT: efficient operation during long periods due to preventing the sticking of solid contaminations in cavities of grooves and on surfaces of guides by formation of micro swirls and micro explosions at availability of two opposite directed swirled vortex flows.

6 dwg