LABYRINTH OVER-STRIP SEALING FOR STEAM TURBINE Russian patent published in 2009 - IPC F01D11/08 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to labyrinth over-strip sealing for steam turbine, containing compacting annular combs of turbine rotor, sealing segment, including close-meshed cellular units, soldered to cases of cellular units between sealing stator combs, implemented at one with cases of cellular units, annular grooves of turbine's stator, allowing V-shaped in longitudinal section of turbine shape and horizontal longitudinal connector. Sealing segments are implemented separately for each row of turbine rotor combs. Cases of cellular units are implemented of plastic alloyed steel and in cross-section allows V-shaped form. Dimensions provide to insert cases of cellular units in V-shaped groove of turbine's stator with minimal gap. Before mounting cases of cellular units allows in cross-section plate form, which during mounting, implemented by pushing of cases of cellular units from the side of horizontal socket lengthwise V-shaped groove of turbine's stator, assumes a shape curved in longitudinal section. Owing to received during mounting difference of radius of curvature of groove of turbine's stator and cases of cellular units, cases of cellular units are fixed in radial direction ensured by elasticity of cases' material.

EFFECT: such implementation of sealing provides cost reduction of its manufacturing and increase of maintainability.

4 dwg