Patent ID: 6203274
Filing Date: 2001-03-20
Classification: F01D,F02C,F05D

Abstract:
A steam turbine comprising:a high-pressure turbine to which primary steam is supplied;a low-pressure turbine on a final-stage side of said high-pressure turbine and having last-stage turbine rotor blades;a turbine rotor formed as an integral rotor member by which said high-pressure turbine and said low-pressure turbine are coupled;an integral casing within which said high-pressure turbine and said low-pressure turbine are accommodated;a downward-exhaust type of exhaust chamber formed in said casing for exhausting in a downward direction exhaust steam that is expelled from said low-pressure turbine;a high-pressure-side journal bearing for supporting said turbine rotor in a rotatable manner on an initial-stage side of said high-pressure turbine; anda low-pressure-side journal bearing for supporting said turbine rotor in a rotatable manner on a final-stage side of said high-pressure turbine; wherein:said primary steam has a steam pressure of at least 100 kg/cm.sup.2 and a steam temperature of at least 500.degree. C.;said steam turbine has a rated power of at least 100 MW;said last-stage turbine rotor blades are rotor blades of an effective blade length of at least 36 inches rotating at 3000 rpm; andthe vertical cross-sectional shape of an inner wall of a conical portion forming a rear portion of said exhaust chamber is a shape generated by a single circular arc.