MULTISTAGE VANE PUMP Russian patent published in 2013 - IPC F04C2/356 F04C11/00 

FIELD: engines and pumps.

SUBSTANCE: multistage vane pump consists of stages fitted on common shaft. Pump every stage comprises rotor 5 fitted to displace axially on the shaft, stator 4, working chamber arranged between said rotor and stator, separation plates 6 displacing in grooves in centerline plane, lower cover 16 with inlets 21 and upper cover 17 with outlets 22. Rotor 5 is shaped to a cam. Stator 4 is composed of two concentric bushes and bottom 11 to make a circular clearance. Grooves 13 and 14 are made in inner bush and bottom 11. Separation plates 6 are engaged via sync element 7. Inlets 21 and 22 outlets in stage covers 16, 17 are arranged opposite its working chambers on different sides of separation plates 6. Ends of adjacent stage covers are coupled to make circular chamber communicated with circular clearance of previous stage.

EFFECT: higher reliability, simplified design, lower costs.

8 cl, 5 dwg