PUMP Russian patent published in 1994 - IPC

FIELD: pump engineering. SUBSTANCE: screw passage is made on inner conical surface of a case. The case is provided with a rotor with outer conical surface provided with working members. Diameters of outer surface of the rotor and inner surface of the case increase from the inlet to outlet of the pump. The working member of the rotor are made of dummy semicircular openings. The screw passage is formed of screw vanes with rounded or sharpened profiles. Inlet edge of the vane, which form the passage, is sharpened. EFFECT: enhanced efficiency. 2 cl, 3 dwg