Method for providing uniform radial clearance of labyrinth seals

Details Method for providing uniform radial clearance of labyrinth seals Method for providing uniform radial clearance of labyrinth seals

1992-11-25

1994-12-20

Cummings, Scott W.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 11, 277 54, F16J 15447

Patent

active

053740688

ABSTRACT:
Arcuate seal segments have radially directed seal faces forming part of a labyrinth seal in a turbine. The segments are adjustably spaced from the locating flanges of the groove formed on a stationary part of the turbine housing to compensate for any distortion of the groove through use. In a positive pressure, variable clearance labyrinth seal, side seals are disposed between the locating flanges of the groove and the flanges of the seal segments and have surfaces at circumferentially spaced positions which are adjustable to maintain concentricity of the seal faces of the seal segments, notwithstanding the distortion of eccentricity of the groove and its locating flanges. Where the locating flanges of the segments normally engage the locating flanges of the groove, variable clearances are provided between those flanges by the interposition of dowels, plugs or pads such that the seal faces of the segments are maintained concentric, notwithstanding distortion of the locating fits.

REFERENCES:
patent: 1792288 (1931-02-01), Dempster
patent: 2279863 (1942-04-01), Downer
patent: 2600991 (1952-06-01), Hargrove
patent: 3594010 (1971-07-01), Warth
patent: 4436311 (1984-03-01), Brandon
patent: 5002288 (1991-03-01), Morrison et al.
patent: 5181308 (1993-01-01), Gray et al.

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