| 摘要 |
PURPOSE:To prevent a shroud ring from cracking due to the temperature difference between its inner and outer circumferential surfaces, by providing a cover plate along the inner circumferential surface of the shroud ring to form a cooling air layer. CONSTITUTION:A cover plate 6 is provided along the inner circumferential surface of a shroud ring 2. A cooling air hole 8 is opened in the shroud ring 2 so that cooling air 7 is caused to flow in between the shroud ring and the cover plate 6. This results in reducing the temperature difference between the inner and outer circumferential surfaces of the shroud ring 2. |
