| 摘要 |
PURPOSE:To securely fix a predetermined blade in a moving blade having a columnar structure where each blade is inserted into an outer circumferential portion of a disc of a rotor, by arranging blades made of materials having a coefficient of thermal expansion greater than that of the disc at a suitable position of the moving blade. CONSTITUTION:A moving blade 3 has a columnar structure where each of blades 3a-3c is inserted into an outer circumferential portion of a disc of a rotor. A stopper blade 3a to be finally inserted is fixed by striking pins 5 between the same and adjacent blades 3b. Similarly, the pins 5 are struck between the blades 3b and adjacent blades 3c. The stopper blade 3a that is apt to be unstably fixed and the blades 3b and 3c that are subject to severe conditions in the viewpoint of strength are made of materials having a coefficient of thermal expansion greater than that of the disc. Thus, each of the blades 3a-3c is stably fixed, thereby achieving improvement in earthquake resistance and improvement in reliability. |
