Retractable segmented packing ring for fluid turbines having gravity springs to neutralize packing segment weight forces
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United States of America Patent
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Aug 10, 1999
Grant Date -
N/A
app pub date -
May 27, 1997
filing date -
May 27, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A segmented seal ring and spring system for steam turbines for minimizing leakage between rotating and stationary components, and preventing damage and wear thereto, with a single gravity spring contained in the lower half seal ring segment to produce an upward force which neutralizes the downward force caused by the weight of all the packing segments; so that only a small fluid pressure force is required to close the lower seal segments; the various segment lenths being adjustable to optimize closure sequence; with pairs of adjacent seal ring segments being optionally hinged to optimize proper motion capability, and individual segments optionally having one or more seal teeth removed to optimize motion capability; with adjacent pairs of ring segments optionally being slideably pinned to force simultaneous radial motion.
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