FIELD: mechanical engineering; steam turbines.
SUBSTANCE: invention relates to labyrinth seals and it can be used in overband seals of steam turbine high pressure cylinders. Sealing holder with cellular inserts is secured in stator housing. Inserts are made stepped. Inserts enclosed ring sealing of band of rotor blades with clearance and band with fastening tenon to form left-hand and right-hand ring expansion chambers. Sealing holder is provided with ring sealing lips which enclose with axial clearance ring sealing strips of rotor blade band from outer side.
EFFECT: simplified design of seal, improved manufacturability and convenience at mounting and repair, increased efficiency of sealing.
2 dwg
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