Method of fixing blades to axial-flow turbine rotors - peripheral lacing wire secures interlocking blades positively, root shoulder is peened over

摘要

To supplement the normal anchorage of the blades (3) in the rotor rim (2), the blade root shoulders (5) have grooves cut in them runnin peripherally on both sides continuous wire (9) is laid into these grooves and held there by rolling in the outer lip. To secure the blades even more firmly, the rotor rim (2) corners can be chamfered and the root shoulder peened over. The wire (9) can also be used to secure a peripheral sealing strip. In addition to holding the blades axially and damping axial vibrations, the wires carry centrifugal loads and shorten the effective blade length, which lowers various blade root stresses.