GAS TURBINE INTERSTAGE SEAL MOUNTED ON TURBINE WHEEL COVER PLATE

摘要

PROBLEM TO BE SOLVED: To provide an improved interstage sealing system for a gas turbine.SOLUTION: A sealing system for a multi-stage turbine includes multiple first interstage seal subsystems disposed circumferentially about a rotor wheel shaft of the multi-stage turbine and extending axially between a first turbine stage and a second turbine stage of the multi-stage turbine. Each of the multiple first interstage seal subsystems includes multiple near flow path seal segments. The multiple first interstage seal subsystems also include a forward cover plate disposed axially between a first turbine wheel of the first turbine stage and the near flow path seal segments, and an aft cover plate disposed axially between the near flow path seal segments and a second turbine wheel of the second turbine stage. The forward cover plate and the aft cover plate extend radially to a first stage bucket and a second stage bucket respectively.SELECTED DRAWING: Figure 1