Mechanism to prevent over-revving of the turbine rotor of a gas turbine engine in the event of a broken shaft

摘要

The invention relates to a mechanism to prevent over-revving of the turbine rotor of a gas turbine engine in the event of a fracture of the shaft connecting the turbine rotor to a compressor rotor. The segments of a guide-wheel arranged downstream of a turbine rotor stage are mounted axially tiltable on their outer circumference and fixed on their inner circumference such that they can be unlocked. If, in the event of a broken shaft, the turbine rotor displaced axially backwards encounters the inner mounting structure of the guide wheel segments, the latter are unlocked on their inner circumference and can tip out axially into the orbit of the turbine rotor blades, as a result of which the rotor blades are destroyed and the turbine rotor is braked.