Rotor blades of steam turbines for SECTIONS OF LOW PRESSURE steam turbine

摘要

1. The rotor blade (20) of a steam turbine, comprising: portion (42) of the airfoil; ! section (44) of the shank fixed to one end portion (42) of the airfoil; ! section (40) in a dovetail protruding from the section (44) of the shank, wherein the section (40) into a dovetail portion includes a tapered dovetail with axial zavodki; ! section (46) ring attached to a portion (42) of the airfoil at the end opposite the section (44) of the shank; ! shroud flange (48) integrally formed as part of the section (46) ring; ! a shelf (50) attached at an intermediate portion of the section (42) of the airfoil between its ends; ! wherein the blade (20) has an annular outlet section area ratio of 4.43 m2 or more. ! 2. The blade according to claim 1, wherein the chamfered portion (40) in the form of a dovetail with axial winding of a taper angle of 19 °. ! 3. The blade according to claim 1, wherein the portion (42) of the airfoil has a length of approximately 68.1 cm or more. ! 4. The blade according to claim 1, wherein the shroud flange (48) comprises a planar section extending from the front edge (34) of a portion (42) of the airfoil at a predetermined distance from it toward the trailing edge (36) of a portion (42) of the airfoil, wherein the shroud flange (48) has a width decreasing substantially from the end located at a predetermined distance from the leading edge (34) to a location substantially in the center with respect to the trailing edge (36) and the front edge (34 ), and the width of the shroud flange (48) increases from the center (58) to the rear kro MKE (36), and the width of the shroud flange (48) at an end raspolozhennog