METHOD FOR CENTRIFUGAL PUMP IMPELLER MANUFACTURING Russian patent published in 2020 - IPC B23P15/00 B21K1/36 F04D29/28 

FIELD: pumps.

SUBSTANCE: invention relates to production of impeller made from the main and covering discs. Blades and hub are made on the main disc. Projections are made on blades in area of discs interfacing. On the covering disk there made are reciprocating grooves mating ledges arranged along the diameter of the impeller in compliance with the blades location. Slots have shape repeating contour of blade 3 and are made parallel to impeller rotation axis. Along the perimeter of each groove on the outer side of the covering disk, the edge formed by the outer surface of the covering disc and the inner edges of the groove is cut, so that the cross-section of the edge cutting along the whole perimeter of the groove retains its shape.

EFFECT: resulting in minimized risk of impeller deformation from thermal welding stresses.

3 cl, 5 dwg