AXIAL-DIAGONAL FLOW SCREW PUMP IMPELLER Russian patent published in 2008 - IPC F04D29/18 F04D3/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to pumps production and covers the design of the axial-diagonal screw pump impeller design. The pump impeller incorporates the blades fitted on a taper hollow sleeve with its inlet furnished with bypass channels and its outlet accommodating the elements of hydrodynamic or slot-like seal. The diameter of the impeller tapered outer surface, described by the running blades, increases from inlet to outlet, the taper angle being equal to 10°÷40°. The impeller smoothly bent blades form diffuser channels. The blade helical surfaces are designed with a variable pitch along the impeller radius and length in compliance with a certain relation defined by mathematical expressions.

EFFECT: higher efficiency of pumping over the liquids with higher viscosity and content of mechanical impurities.

4 dwg