Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1988-10-13
1991-03-26
Shoap, Allan N.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 53, 277148, 4151745, F16J 1544
Patent
active
050022881
ABSTRACT:
An adjustable labyrinth seal for a steam turbine wherein the packing rings may be displaced from a larger diameter position, affording a relatively larger shaft clearance, to a smaller diameter position, affording a relatively smaller shaft clearance. Steam conduits are provided in the turbine casing communicating with the annular space between the individual packing rings and the grooves in which they are retained. The rings are provided with seals and are so configured as to maintain pressure- retaining contact with the sidewalls of the grooves. Steam, at a pressure in excess of the operating pressure of the individual seal, may be admitted to the annular space of the upstream ring to controllably effect the displacement thereof. Steam, at the turbine inlet pressure, is admitted to the annular spaces of the remaining rings to effect their displacement. In a further embodiment, one or more of the remaining rings may receive pressurized steam from an external source to control precisely the time at which they close.
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Tsunoda, Kikuchi, Ikeda: "Clearance Control System of Packing Rings for Steam Turbine", 12/1/87.
Morrison Bruce L.
Morson Alexander
Cummings Scott
General Electric Company
Shoap Allan N.
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