| 摘要 |
PROBLEM TO BE SOLVED: To improve a cooling effect of a bearing by rotatably mounting a bore tube assembly having cooling and heat insulating systems around a rotor shaft of a turbine, and sectioning an air passage for cooling a bearing between an outer tube of the assembly and the bearing. SOLUTION: Four stages including turbine wheels 38, 40, 42, 44 are disposed on a turbine section 36 of a rotor shaft in a gas turbine for driving a power generator with generated power, and a bore tube assembly 48 having cooling and heat insulating systems is rotatably mounted around the rotor shaft. The bore tube assembly 48 is composed of an outer tube formed integratedly with a rear shaft 76 and an inner tube 52, a steam supplying flow passage for cooling is formed between the inner and outer tubes, and a steam return flow passage for cooling after use is formed in the inner tube 52. An air passage 100 for cooling is formed between a bearing 74 and the rear shaft 76, and is communicated with a radial direction passage 106 which is led to the bearing 74.
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