HYDRAULIC MACHINE IMPELLER, HYDRAULIC MACHINE CONTAINING SUCH IMPELLER, AND ENERGY CONVERSION PLANT EQUIPPED WITH SUCH HYDRAULIC MACHINE Russian patent published in 2015 - IPC F03B3/02 F03B13/12 

FIELD: machine building.

SUBSTANCE: group of inventions relates to the impeller of Francis impeller for the hydraulic machine through which the forced water flow shall pass. The Francis impeller for the hydraulic machine contains rim (1) with symmetrical rotation around the rotation axis (Z) of the impeller, ceiling (12) and multiple bent blades (21) secured with rim (1) and ceiling (12), each of them has peripherical edge (212). Edge (212) of at least one of the blades (21) is bent and its concavity looks outside the impeller. Distance measured between any point of the edge (212) and straight line passing from one side through first point of interface between the edge (212) and rim (1), and from the other side through the second point of interface between the edge (212) and ceiling (12) is maximum at level of the intermediate point of the edge (212). Radius of the intermediate point is strictly lower the radius of first interface point and radius of second interface point.

EFFECT: invention designs the impeller which geometry ensure stabilisation of the impeller rotation speed during transient start-up phases at relatively low fall heights.

15 cl, 10 dwg