MULTISTAGE AIR LIFT Russian patent published in 2003 - IPC

FIELD: power engineering, construction, mining industry. SUBSTANCE: receiving reservoir of each stage of multistage air lift, starting from second stage, is provided with vertical pipe whose lower end communicates with space of receiving reservoir. Upper end of vertical pipe communicates with atmosphere through throttling device. Height of each vertical pipe is always greater than height of lifting pipe of preceding stage. Lower ends of vertical pipes first two-three stages are arranged on one constant horizon. Invention makes it possible to lift liquid from low depth water reservoirs. EFFECT: reduced power consumption for lifting one unit of liquid. 1 tbl, 1 dwg