Gas turbine shaft and heat shield cooling arrangement

摘要

A heat shield pipe portion 12a formed in an air layer 21 to protcet a bearing member metal 16 from the heat of a cooling medium 16 and a seal shaft portion 12c for forming a labyrinth seal 14 to prevent a leakage of the cooling medium arc formed with one piece and they form a heat shield seal pipe 12. A component number for installing the components to a rear portion shaft 105 can be arranged as one and also a bolt connection portion can be deleted. Namely, the bearing member metal 16 can be constituted to protect the bearing member metal from the heat of the cooling medium and the construction of the gas turbine can be simple and the manufacture thereof performs easily and further during the operation time the generation of the vibrations according to the centering displacement can be reduced. In a gas turbine in which a cooling medium is cooled by communicating the cooling medium in a turbine rotor blade, a construction can be simple and a manufacture is easily and further during an operation time a generation of vibrations according to a centering displacement can be reduced. A gas turbine having a rotor driver by a shaft with a cooling medium passageway therein has a heat shield pipe portion mounted inside the passageway which forms an air layer with a wall of the passageway to protect a bearing member metal supporting the shaft from the heat of a cooling medium and a seal shaft portion for forming a labyrinth seal to prevent leakage of the cooling medium are formed as one piece and constitute a heat shied seal pipe.