| 摘要 |
PROBLEM TO BE SOLVED: To provide a seal between the inner ring 34 of a diaphragm nozzle segment 35 and the peripheral part of a rotor 16 in a steam turbine. SOLUTION: This seal comprises a honeycomb structure 40 brazed to the radial inner surface of an inner ring segment. A labyrinth toothed projection 46 on the rotor is cut in or rubbed on the surface of the honeycomb structure to form the seal 36. The honeycomb structure is desirably made of a cobalt-based nickel alloy having a multiple side-face cell brazed to the inner ring and opening to the rotor in the radial inner direction. In the seal, leaked steam flow between a high-pressure upstream side flow area and a downstream side low pressure area on both sides of a nozzle/rotor boundary surface is eliminated or minimized. COPYRIGHT: (C)2005,JPO&NCIPI |
