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US 2015/0001812 A1Published application
Labyrinth seal for turbines
AssigneeALSTOM Technology Ltd
InventorsVasileios STEFANIS, Christos GEORGAKIS
Life of this patent
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Abstract
An improved labyrinth seal is described with the seal including a group of several fins forming circumferential barriers against the flow of a working fluid between stationary and rotating parts in a turbine, wherein within the group the volume between the penultimate fin and the last fin is altered compared to the average volume between other adjacent fins of the group.
Claims6
A labyrinth seal arrangement for an axial flow turbine comprising:
- a stationary part and a rotating part;
- an axial series of fins, distributed equidistantly along points of the stationary part and each extending from the stationary part towards the rotating part to a tip so as to form a circumferential barrier against a flow of a working fluid between the stationary part and the rotating part, and
- a groove in the stationary part located between a penultimate fin and a last fin wherein, as a result of the groove, a volume between the penultimate fin and the last fin is greater than the average volume of any other two adjacent fins of the series.
Dependencies are inferred from the claim text.