STEAM TURBINE, AND TURNING BLADE (VERSIONS) Russian patent published in 2013 - IPC F01D5/30 

FIELD: machine building.

SUBSTANCE: blade installed on the disc includes blade root and blade shank. Blade shank includes the first, the second and the third teeth and the first, the second and the third necks. Each tooth includes contact surface and non-contact surface. Angle between non-contact surface of the first tooth and contact surface of the second tooth and between non-contact surface of the second tooth and contact surface of the third tooth is optimised for reduction of local and average stresses and is symmetrical relative to the axis perpendicular to central line of blade shank. As per the other version of the blade, the above angle is approximately 70.6°. One more invention of the group refers to the turbine containing the blade and rotor disk. Rotor contact surfaces are located relative to non-contact surfaces of rotor at the angle that is equal to the angle of contact surfaces of blade and non-contact surface of blade; at that, angle is optimised to reduce local and average stresses between contact surfaces and is essentially symmetric relative to the axis perpendicular to central line of blade shank.

EFFECT: inventions allow decreasing local loads on rotor without increasing average values of stresses.

16 cl, 8 dwg