LABYRINTH SHROUD SEAL FOR STEAM TURBINE Russian patent published in 2013 - IPC F01D11/08 

FIELD: machine building.

SUBSTANCE: labyrinth shroud seal for a steam turbine comprises sealing circular combs of the turbine rotor, sealing segments, including sealing units, attached to bodies of sealing units, which are V-shaped in the cross section, with dimensions making it possible to insert bodies of sealing units into a V-shaped slot of the turbine stator with a minimum gap and arranged between sealing stator combs made as integral with the bodies of sealing units, circular slots of the turbine stator, which are V-shaped in the longitudinal section of the turbine and a horizontal longitudinal joint. At the same time the sealing units are made of particles of run-in powder material that are adhesively connected to each other into a solid material, are V-shaped in the cross section, and inner surfaces of the sealing unit bodies are V-shaped in the cross section, corresponding to the sealing units, with dimensions making it possible to insert sealing blocks with a minimum gap into bodies of sealing units.

EFFECT: simultaneous provision of high running-in, mechanical strength and wear resistance of a seal, reduced labour intensiveness of its manufacturing.

25 cl, 2 dwg