GAS TURBINE POWER GENERATOR AND ITS ASSEMBLING METHOD

摘要

A gas turbine power generator is provided with a tie−bolt (5) having a large−diameter portion (5a) and a small−diameter portion (5b) and serving as a spindle. A compressor (3) and a turbine (4) engage with the large−diameter portion (5a), and the rotor (14) of a power generator (13) is fitted on the small−diameter portion (5b) to constitute an integral rotating rotor (16). The tie−bolt (5) has a larger diameter at a portion relatively close to the turbine (3) and in a high−temperature environment, to retain a strength enough to stand high−speed rotation in the high−temperature environment. The rotor (14) in a relatively low−temperature environment is fitted to the small−diameter portion (5b) of the tie−bolt (5), and the diameter of a shaft hole (14e) extending through the small−diameter portion (5b). In short, the hoop stress acting on the rotor (14) is reduced to prevent the lifetime from becoming short. Therefore, it is possible to ensure the reliability of the tie−bolt (5) serving as the spindle sufficiently.