Patent ID: 6783321
Filing Date: 2004-08-31
Classification: F01D

Abstract:
Apparatus for coupling flowpaths of axially adjacent turbines to one another, comprising:first and second turbine coupled axially to one another along a flowpath with fluid flow along a first flowpath portion along the first turbine exhausting from said first turbine and into a second flowpath portion along the second turbine, said turbines having respective rotors and a coupling between said first and second rotors for coupling the turbines to one another; an inner cover extending between a final stage of said first turbine and a first stage of said second turbine and extending about and overlying the coupling between the rotors to isolate the rotor coupling from the flowpath and present a substantially smooth transition of the fluid flow from the first flowpath portion of said first turbine to the second flowpath portion of said second turbine; an outer wall defining an outer margin of the flowpath between the first and second turbines, said inner cover and said outer wall defining a diffuser between said first and second turbines and about said coupling; said outer wall forming part of a cast outer turbine shell.