| 摘要 |
PROBLEM TO BE SOLVED: To prevent abrasion and damage by fixing, with simple structure, a heat shield pipe provided by being divided every disc shape member, and to provide a seal structure. SOLUTION: A cooling medium supply passage 7 is formed in a first stage turbine disc 11, and a counterbore 76 having a large inner diameter is formed to a backward opening part of the passage. A ring-shaped projection 71 capable of being closely fitted to the couterbore 76 is formed to a backward end part of the heat shield pipe 70, and an E-type seal member having a comparatively large elasticity is attached to an outer peripheral backward part of the ring- shaped projection 71, and is brought into contact with a front stacking surface of a spacer disc 15 between first and second stages. Since the ring-shaped projection is restricted in radial and axial directions, the abrasion and damage due to movement can be prevented. Further, the seal structure is provided in which stress concentration is prevented from increasing due to working. |
