Variable clearance seal assembly

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member

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Details

277 56, 277 149, 4151733, F16J 1548, F01D 520

Patent

active

056035101

ABSTRACT:
This invention relates to an improved variable clearance, segmented seal ring assembly for preventing fluid flow between a stationary casing and a rotating shaft in a fluid dynamic system. The casing has a cavity for receiving and holding a portion of a seal ring segment. In the cavity, a helical spring biases the segment away from the casing and leaf springs bias the segment toward the casing so as to suspend the segment between the casing and the shaft. Advantageously, this assembly provides a seal between the shaft and casing which maintains system efficiency during normal operations by preventing damage during transient operations, i.e., minimum and maximum operating pressure conditions.

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"Steam Turbines", 3rd Edition, McGraw Hill Book Company, Inc. (1950) by E. F. Church.

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