BLADE ROOT, CORRESPONDING BLADE, ROTOR DISC AND TURBOMACHINE UNIT Russian patent published in 2017 - IPC F01D5/30 

FIELD: machine building.

SUBSTANCE: blade root contains plurality of opposite projections pairs, plurality of opposite roundings pairs, plurality of side surfaces and blade root lower part. Projections and roundings are arranged in alternating order, and each of side surfaces is located between one of projections and one of roundings. First side surface from plurality of side surfaces facing away from lower part, has first planar surface section adjoining surface convex section and located in first plane. Projection surface convex section adjoins to surface first planar section, and rounding surface concave section adjoins to surface convex section. Surface convex section and rounding surface concave area adjacent to surface convex section, form local cavity relative to first plane. Another invention of group relates to blade, containing feather, flange and root, made as described above. One more invention of group relates to rotor disc, containing plurality of slots, each of which contains plurality of opposite projections pairs, plurality of opposite roundings pairs, plurality of side surfaces and disk slot lower part. Slot projections and slot roundings are arranged in alternating order, and each of slot side surfaces is located between one of projections and one of roundings. First slot side surface from plurality of slot side surfaces facing to slot lower part, has second surface planar section adjoining to convex transient section. Second surface planar section is located in first plane. Slot projection surface convex section adjoins to surface second planar section; and slot rounding surface concave section adjoins to convex transient section. Convex transient section and slot rounding surface concave area adjacent to convex transient section, form local cavity relative to first plane. Inventions of group are additionally relate to versions of turbo-machine unit containing above mentioned rotor disc and blade.

EFFECT: group of inventions allows to reduce stresses at disc and blade contact points.

15 cl, 8 dwg