COOLING CIRCUIT FOR REDUCING THERMAL EXPANSION DIFFERENTIAL BETWEEN TURBINE ROTOR AND SHELL SUPPORTS

摘要

PROBLEM TO BE SOLVED: To achieve more uniform thermal expansion characteristics between a rotor and a shell to reduce leakage loss.SOLUTION: A pedestal part for supporting a turbine rotor and a turbine shell includes a bearing block including a housing enclosing bearing surfaces engageable by the turbine rotor. Turbine shell-arm supports are located on opposite sides of the housing, and each has a horizontal surface and one or more vertical surfaces adapted to be engaged by support arms of a turbine shell enclosing at least a portion of the turbine. An internal cooling/heating circuit is arranged to simultaneously cool or heat the bearing block and the turbine shell-arm supports, thereby reducing differential thermal expansion characteristics of the turbine rotor and turbine shell.