Patent ID: 6341937
Filing Date: 2002-01-29
Classification: F01D

Abstract:
A steam turbine comprising:a rotor extending along a longitudinal axis and having at least two different pressure turbine portions disposed around and along the rotor, each of which has multiple stages; a casing for enclosing the rotor, the casing including at least one steam inlet; a dummy ring, provided stationarily around the rotor, for separating and sealing between the two different pressure turbine portions, the dummy ring defining a nozzle chamber for receiving the steam from the steam inlet port and a plurality of nozzles for directing the steam from the nozzle chamber toward the higher pressure turbine portion, the dummy ring and the casing defining a space therebetween, the space being fluidly connected to the higher pressure turbine portion; a first steam passage, extending between the space and a second steam passage downstream of the last stage of the higher pressure turbine portion, for allowing the steam within the space to flow to the second steam passage downstream of the last stage of the higher pressure turbine portion to cool the casing.