Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1988-12-14
1991-07-09
Shoap, Allan N.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 55, 4151745, F16J 15447
Patent
active
050298763
ABSTRACT:
A labyrinth seal system for reducing leakage flow of a compressible fluid between a rotating portion of a machine rotating relative to a stationary portion of the machine. A stator seal element is connected to the stationary portion of the machine and a rotor seal element is connected to the rotating portion of the machine. The rotor seal element defines a plurality of staggered cavities. Straight long teeth connected to the stator seal element define throttling clearances with the bottom walls of the staggered cavities of the rotor seal element, and short teeth connected to the stator seal element slanted upstream relative to the direction of leakage flow define throttling clearances with the rotor seal element. Undercuts can optionally be defined by the rotor seal element on the downstream side of the cavities. Optional straight teeth connected to the rotor seal element downstream of the cavities define throttling clearances with the stator seal element. The short teeth of the stator seal element can optionally be straight. Optionally all the teeth can be slanted in the direction of leakage flow. The configurations of the rotor seal element and the stator seal element can be reversed.
REFERENCES:
patent: 1794747 (1931-03-01), Wiberg
patent: 2123818 (1938-07-01), Wegmann
patent: 4351532 (1982-09-01), Laverty
"The Leakage of Steam Through Labyrinth Seals", by Adolf Egli, Transactions of The American Society of Mechanical Engineers, Fuel and Steam Power, vol. 57.
"Aerodynamic Performance of Conventional and Advanced Design Labyrinth Seals with Solid-Smooth, Abradable, and Honeycomb Lands", H. L. Stocker, D. M. Cox, G. F. Holle, NASA Lewis Research Center.
Johnston, Jr. Paul B.
Orlando Robert J.
General Electric Company
Shoap Allan N.
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