DEVICE FOR SEALING OF STEAM TURBINE STAGE CLEARANCE Russian patent published in 2003 - IPC

FIELD: power engineering industry; applicable in designing and modernization of cylinders of middle- pressure and low-pressure steam turbines. SUBSTANCE: device includes stator shell with circular chamber accommodating sealing segments. Segment is made integral with spring. In this case, spring is located on the first, in direction of rotation of rotor blades, end of sealing segment and its free end is connected to wall of circular chamber. The other end of sealing segment is pressed by spring of next in rotation of rotor blades sealing segment. Sealing segment is made in form of cellular member with impermeable sealing surface and side walls adjacent to internal walls of circular chamber and forming closed cavity together with said chamber. Hollows of cellular surface of sealing segment have slots. In addition, circular chamber walls have inlet pair of holes on side of high-pressure and outlet pair of holes on side low pressure. In this case, inlet holes are removed from sealing surface through distance larger than outlet holes. Sealing segment side wall adjacent to outlet holes has holes. EFFECT: higher reliability and economic efficiency of steam turbine stage. 4 cl, 7 dwg