Patent ID: 8454306
Filing Date: 2013-06-04
Classification: F01D,F05D

Abstract:
1. A steam turbine for high-pressure range or intermediate-pressure ranges, the steam turbine comprising: an inner casing having radially extending stator blades; a rotor rotatably mounted around an axis and concentrically enclosed at a distance by the inner casing, the rotor including rotor blades and a balance piston; a flow passage formed between the rotor and the inner casing, the flow passage having an inlet axially delimited by the balance piston, the rotor blades and stator blades, alternating in the direction of flow, radially projecting into the flow passage; an inlet scroll at an entry of the flow passage through which steam can be guided from the outside radially inwards and deflected in a deflection region in the axial direction to the flow passage inlet, the inlet scroll being formed on the inner casing; a stress-relief slot in the deflection region upstream of a first rotor blade row configured and arranged to reduce stresses in a fastening slot of the first rotor blade row in the rotor; a heat shield in the region of the stress-relief slot configured and arranged to protect the rotor against high temperatures; and wherein the heat shield is fastened on the inner casing and merges into the stress-relief slot without direct contact with the rotor.