GAS TURBINE SPINDLE BOLT SEAL DEVICE

摘要

In gas turbine constructed such that steam is used for cooling of gas turbine high temperature portion to be then recovered, steam is prevented from leaking in spindle bolt portion of turbine disc. Seal hole 4 is formed in turbine disc 8 portion through which spindle bolt 1 passes. In the seal hole 4, seal piece 3 having smaller coefficient of linear expansion than the spindle bolt 1 and seal piece cover 5 for covering the seal piece 3 are disposed. The seal piece cover 5 is bored with pressure hole 6 through which high pressure side steam pressure is introduced into inner side of the seal piece cover 5 so that the seal piece 3 of inner side is urged on sheet surface 7 of the seal hole 4.