Non retractable segmented packing ring for fluid turbines having special springs to reduce forces during shaft rubbing
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Jul 13, 1998
filing date -
Jul 13, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A segmented seal ring and spring system for very low pressure drop zones in steam turbines for minimizing leakage between rotating and stationary components, and preventing damage and wear thereto, including a segmented seal ring, with first springs biased against the seal segments to urge the segments radially inwardly toward a small clearance position of the seal ring with respect to the turbine shaft secondary springs to counter the weight of the segments; with the combination of said springs gently urging the seal segments into the small clearance position while allowing clearance enlargement with small resulting forces on the shaft during periods of misalignment and rubbing.
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