Closed circuit blade-cooled turbine

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 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, wherein

• said 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, and
• the sum of minimum sectional areas of any parts in the neighborhood of connections of said plurality of parallel flow paths for refrigerant supply for said second stage moving blades and said respective refrigerant flow paths in said second stage moving blades and in the neighborhood of connections of said plurality of parallel flow paths for refrigerant collection for said second stage moving blades and said respective refrigerant flow paths in said second stage moving blades is always smaller than the sum of minimum sectional areas of any parts in the neighborhood of connections of said plurality of parallel flow paths for refrigerant supply for said first stage moving blades and said respective refrigerant flow paths in said first stage moving blades and in the neighborhood of connections of said plurality of parallel flow paths for refrigerant collection for said first stage moving blades and said respective refrigerant flow paths in said first stage moving blades.

A closed circuit blade cooled turbine having moving blades at a plurality of stages arranged in a flowing direction of main gas of a gas turbine and fixed to the outer periphery of a rotor, supplying a refrigerant at least to 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, wherein

• said 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, and 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;
• the sum of minimum sectional areas of any parts of said plurality of parallel flow paths for refrigerant supply for said second stage moving blades and said plurality of parallel flow paths for refrigerant collection and said respective refrigerant flow paths in said second stage moving blades is always smaller than the sum of minimum sectional areas of any parts of said plurality of parallel flow paths for refrigerant supply for said first stage moving blades and said plurality of parallel flow paths for refrigerant collection and said respective refrigerant flow paths in said first stage moving blades;
• and
• wherein members suppressing leakage of refrigerant are detachably mounted on refrigerant flow courses to adjust said minimum sectional areas.

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 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, wherein

• said 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;
• the sum of minimum sectional areas of any parts in the neighborhood of connections of said plurality of parallel flow paths for refrigerant supply for said second stage moving blades and said respective refrigerant flow paths in said second stage moving blades and in the neighborhood of connections of said plurality of parallel flow paths for refrigerant collection for said second stage moving blades and said respective refrigerant flow paths in said second stage moving blades is always smaller than the sum of minimum sectional areas of any parts in the neighborhood of connections of said plurality of parallel flow paths for refrigerant supply for said first stage moving blades and said respective refrigerant flow paths in said first stage moving blades and in the neighborhood of connections of said plurality of parallel flow paths for refrigerant collection for said first stage moving blades and said respective refrigerant flow paths in said first stage moving blades;
• and
• wherein members suppressing leakage of refrigerant are detachably mounted on refrigerant flow courses to adjust said minimum sectional areas.

A closed circuit blade cooled turbine having moving blades at a plurality of stages arranged in a flowing direction of main gas of a gas turbine and fixed to an outer periphery of a rotor, supplying a refrigerant at least to first stage and second stage moving blades from the upstream side among said moving blades at said plurality of stages, and collecting said refrigerant after cooling without discharging it into the main gas, wherein

• said rotor has inside a branch point of a refrigerant supply path for said first stage moving blades and 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,
• supply members or collection members each having inside an inner flow path are arranged at least second stage side connection portions of first stage side connection portions of said plurality of parallel flow paths for refrigerant supply and said plurality of parallel flow paths for refrigerant collection for said first stage moving blades to said respective refrigerant flow paths in said first stage moving blades, and second stage side connection portions of said plurality of parallel flow paths for refrigerant supply and said plurality of parallel flow paths for refrigerant collection for said second stage moving blades to said respective refrigerant flow paths in said second stage moving blades,
• the sum of minimum sectional areas of any parts of said plurality of parallel flow paths for refrigerant supply for said second stage moving blades and said plurality of parallel flow paths for refrigerant collection and said respective refrigerant flow paths in said second stage moving blades is always smaller than the sum of minimum sectional areas of any parts of said plurality of parallel flow paths for refrigerant supply for said first stage moving blades and said plurality of parallel flow paths for refrigerant collection and said respective refrigerant flow paths in said first stage moving blades, and
• said supply members or collection members, each having inside an inner flow path, are members detachably provided to suppress leakage of refrigerant.