CENTRIFUGAL SCREW PUMP Russian patent published in 2003 - IPC

FIELD: mechanical engineering; pumps. SUBSTANCE: centrifugal inclined Archimedean screw pump consists of housing, fixed guide vane assemblies, screw prepump and centrifugal impellers with bushings and disks. Through holes are made in disks near bushing and channels are made at both sides which are uniformly distributed over circumference. Centrifugal impellers are closed, and channels are rectangular. Channels inlets are sharply pointed. Upper edge of channels is directed tangentially relative to inner surface of pump space before impellers. Through holes in impeller disk designed for flowing of liquid to other side of impellers are made at angle of 45...60^° to longitudinal axis of rotor being pointed in direction opposite to sense of rotation. Inlet of guide vane assemblies is made rounded (smooth). Sealing cup is installed on rotor shaft from side of drive. Space before cup is connected with space between screw prepump and first stage of pump. Grooves are made in impeller interchannel space. EFFECT: improved performance characteristics of pump and its design. 5 cl, 3 dwg