Uniform clearance, temperature responsive, variable packing ring

Details Uniform clearance, temperature responsive, variable packing ring Uniform clearance, temperature responsive, variable packing ring

1998-04-15

2000-05-23

Brittain, James R.

Seal for a joint or juncture

Seal between relatively movable parts

Close proximity seal

277931, 277413, 277421, F16J 1544

Patent

active

060657545

ABSTRACT:
A variable clearance packing ring includes a plurality of circumferentially extending segments disposed in a generally dovetail-shaped slot in the stationary component of a machine having a rotor rotatable about an axis, the packing ring including an arcuate seal face in opposition to the rotor and axially extending flanges within the dovetail slot. Pins project axially from opposite sides of the stationary component for location between the flanges and sealing faces of the segments. A centering ring is mounted on the pins for each segment and has a coefficient of thermal expansion greater than the coefficient of thermal expansion of the segment. The centering rings engage the flanges of the segments at a first location, maintaining the segment seal face in a first clearance position relative to the rotor and engage the flanges at a second location in response to relative thermal expansion of the segment and the centering rings, enabling the segment to be displaced radially inwardly under the bias of a spring to locate the seal face in a second clearance position about the rotor radially inwardly of the first clearance position.

REFERENCES:
patent: 2600991 (1952-06-01), Hargrove
patent: 3964753 (1976-06-01), Junker et al.
patent: 4436311 (1984-03-01), Brandon
patent: 5374068 (1994-12-01), Jewett et al.
patent: 5395124 (1995-03-01), Brandon
patent: 5464226 (1995-11-01), Dalton

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