TURBOMACHINE ROTATING BLADE Russian patent published in 1998 - IPC

FIELD: axial-flow turbomachines (gas and steam turbines and compressors) whose blades suffer high temperatures and stresses, as well as corrosion and erosion effect of working media. SUBSTANCE: blade has lock 1, feather 2, inner collar 4, peripheral collar 6, short superenclosures 3 and 5, primarily metal minienclosures , protective coatings, sliding side supports. Short superenclosures 3 and 5 secured to intermediate and peripheral collars, respectively, suffer much lower stresses under action of centrifugal forces of their masses than long monosuperenclosure secured on periphery. Total tensile stresses are also much lower in peripheral part of feather. Stack of minienclosures whose surfaces are covered with protective coatings ensure thermal protection of feather by reducing intensity of heat radiation fluxes, improving heat transfer and convection, thereby reducing temperature of feather metal and of minienclosure materials. Sliding side supports are made in the form of projections on inner surface of superenclosures which increases their bending strength and rigidity. EFFECT: improved strength, temperature conditions, erosion and corrosion protection of blade. 4 cl, 4 dwg