| 摘要 |
A segmented seal ring and spring system for steam turbines for minimizing leakage between rotating (11) and stationary (12) components, and preventing damage and wear thereto, including a segmented seal ring (13), with first springs (16) biased against the seal segments (13) to urge the segments radially outward toward a large clearance position of the seal ring with respect to the turbine shaft. The springs (16) urge the seal segments (13) into the large clearance position at low shaft speeds and small turbine loads, whereas at medium to high flows and high working pressure, working fluid will overcome the spring forces and urge the seal segments into a small clearance position. Special gravity springs (36) are provided in the lower half seal ring segments (13) with the lower end of such springs seated against the turbine casing (12) while the upper spring end is biased against the seal segment (13). |
