Patent ID: 6491495
Filing Date: 2002-12-10
Classification: F01D,F02C,F05D

Abstract:
A closed circuit blade cooled turbine having moving blades at a plurality of stages arranged in a flowing direction of a main gas of a gas turbine and fixed to the outer periphery of a rotor, supplying a refrigerant at least to the first stage and second stage moving blades from an upstream side among said moving blades at said plurality of stages, and collecting said refrigerant after cooling without discharging it into the main gas, whereinsaid turbine, inside said rotor, has a branch point of a refrigerant supply path for said first stage moving blades and a refrigerant supply path for said second stage moving blades and a junction of a refrigerant collection path for said first stage moving blades and a refrigerant collection path for said second stage moving blades, said refrigerant supply path and said refrigerant collection path for said first stage moving blades and said refrigerant supply path and said refrigerant collection path for said second stage moving blades have a plurality of parallel flow paths for refrigerant supply and a plurality of parallel flow paths for refrigerant collection to be connected to said respective refrigerant paths in said moving blades at each said stage between said branch point and said junction, first metal fittings having an internal flow path are arranged at any part of said plurality of parallel flow paths for refrigerant supply for said first stage moving blades, said plurality of parallel flow paths for refrigerant collection, and said respective refrigerant flow paths in said first stage moving blades, second metal fittings having an internal flow path are arranged at any part of said plurality of parallel flow paths for refrigerant supply for said second stage moving blades, said plurality of parallel flow paths for refrigerant collection, and said respective refrigerant flow paths in said second stage moving blades, and the sum of sectional areas of said internal flow paths of said second metal fittings is smaller than the sum of sectional areas of said internal flow paths of said first metal fittings.