Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1982-05-10
1983-12-13
Ward, Jr., Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277134, 415172A, 415176, F16J 1544, F16J 1540, F01D 520
Patent
active
044201613
ABSTRACT:
Labyrinth sealing apparatus to prevent rotational instability in the rotor of a steam turbine wherein such instability is of the type induced by steam whirl within the labyrinth seals. In a preferred form, the apparatus includes a plurality of fixed, spaced-apart annular teeth surrounding the shaft of a steam turbine whereby each tooth has a radially inner edge in very close proximity to the rotor surface, and further includes a fixed circumferential row of spaced-apart flow directing vanes encircling the rotor on the upstream side of the annular teeth. Each vane of the row extends radially inward to within very close proximity of a raised annular land on the shaft surface just opposite the vane row. The row of flow directing vanes and the raised land cause substantially the entire quantity of steam which enters the seal to pass through the row of flow directing vanes. Steam flow within the seal is caused to have a retrograde component counter to the direction of shaft rotation. This produces stabilizing forces on the rotor to neutralize destabilizing forces.
REFERENCES:
patent: 790744 (1905-05-01), Parsons
patent: 1810370 (1931-06-01), Ray
patent: 3594010 (1971-07-01), Warth
patent: 4273510 (1981-06-01), Ambrosch et al.
NASA Conference Publication 2133, "Flow Induced Spring Coefficients of Labyrinth Seals for Application in Rotor Dynamics", May 12-14, H. Benckert et al.
Conference on Vibrations in Rotating Machinery I. Mech. E., Sep. 15-17, 1976 "Investigations into Load Dependent Vibrations of the High Pressure Rotor On Large Turbo-Generators", S. H. Greathead et al.
Paper No. C258/80 "Flow Induced Spring Constants of Labyrinth Seals", H. Benckert et al., 1980.
Paper No. C283/80 "Spring and Damping Coefficients of the Labyrinth Seals", M. Kurohashi et al., 1980.
Paper No. C311/80 "Further Investigations into Load Dependent Low Frequency Vibration of The High Pressure Rotor on Large Turbo-Generators", S. H. Greathead et al., 1980.
2nd International Conference on Vibrations in Rotating Machinery I. Mech. E., Sep. 1-4, 1980, Paper No. C258/80 "Flow Induced Spring Constants of Labyrinth Seals", H. Benckert et al.
Ahern John F.
General Electric Company
Kain, Jr. Robert C.
Ward, Jr. Robert S.
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