HYDRAULIC MACHINE IMPELLER, HYDRAULIC MACHINE CONTAINING SUCH IMPELLER, AND ENERGY CONVERSION PLANT EQUIPPED WITH SUCH HYDRAULIC MACHINE Russian patent published in 2013 - IPC F03B3/02 F03B3/12 

FIELD: machine building.

SUBSTANCE: impeller of Francis type includes rim 1 with rotation symmetry about rotation axis Z of impeller and bent blades 21, 22, which are rigidly attached to rim 1, each of which includes external peripheral edge 212, 222 and internal central edge 211, 221. Connection points B₂₁, B₂₂ of rim 1 with internal central edges 211, 221 of blades 21, 22 are located on one and the same circle C₂₀ centred relative to above mentioned axis Z. Connection points A₂₁, A₂₂ of rim 1 with external peripheral edges 212, 222 of blades 21, 22 are located at least on two different circles C₂₁, C₂₂ centred relative to axis Z.

EFFECT: reduction of the cost of composite elements of devices owing to limiting their dimensions by reducing the action on them of radial stresses under unsteady conditions.

11 cl, 4 dwg