Piston ring assemblies for high temperature seals
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United States of America Patent
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-
May 28, 1996
Grant Date -
N/A
app pub date -
Jan 25, 1994
filing date -
Jan 25, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a turbine inclusive of:a turbine shaft having a longitudinal axis, a steam pipe, a shell circumadjacent the pipe, the pipe and shell being shiftable in vertical and transverse and axial directions relative to the longitudinal axis of the shaft, and a seal assembly disposed between the pipe and shell and comprising a stack of interdigitated relatively large and small piston rings, the improvement comprising: placement of the stack of large and small rings into a circular container which is inserted into the shell with adequate clearance to permit thermal expansion, the container being provided with a flexible seal to the shell and having thermal inertia similar to that of the rings and the pipe.
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