labyrinth seal

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labyrinth seal

[′lab·ə‚rinth ‚sēl]
(engineering)
A minimum-leakage seal that offers resistance to fluid flow while providing radial or axial clearance; a labyrinth of circumferential knives or touch points provides for successive expansion of the fluid being piped; used for gas pipes, steam engines, and turbines.

labyrinth seal

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A type of air and/or oil seal used around the main-shaft bearing in a gas turbine engine. The seal consists of a series of rotating blades that almost contact the seal land (the base of the seal). A small amount of air flows between the seal and the land and prevents oil from flowing past the seal. A gas seal between fixed and moving parts that compose a series of chambers, even though their sides do not quite touch, reduces the escape of gas to near zero.
References in periodicals archive ?
Description: Supply and installation of blades, shrouds, assembly materials, labyrinth seals and the parting plane studs and nuts for the HP cylinder of 30 MW Franco tosi steam turbines at Sitra Power and Water Station.
Kostyuk [1] performed the first comprehensive analysis for the aerodynamic forces of gas labyrinth seals excluding the influence of area change due to eccentricity on cross-coupled forces.
To design specific damping characteristics and frequency dependencies, sophisticated approaches use labyrinth seals which are the focus of this work.
The numerical simulations of the steam exciting force in labyrinth seals were proposed by Mooree et al.
A high carbon and graphite filled PTFE offers low coefficient of thermal expansion, making it ideal for the manufacture of water turbine bearings and labyrinth seals. Slightly less carbon graphite (a medium to high filler) won't offer the same thermal expansion properties, but will yield optimum wear rates, making it more beneficial to air compressor applications.
The rollers are engineered to absorb shocks and incorporate high-performance labyrinth seals to protect the ball bearings from damp and dusty environments.
Sealing of the drive shaft is in the form of wear-free labyrinth seals. On the output side, the housings are connected to the girth-gear hood by a flexible, oil-tight bridge.
This new line also includes labyrinth seals on each end of the motor, enhanced sealing around the lead exit, same size bearings on each end and a moisture resistant insulation system.
With the increasing parametric options of the working body of turbomachinery the research questions and rational design of the labyrinth seals are becoming more relevan, since an increase in initial pressure increases the leakages through all the labyrinth seals of the machine and reduces the benefits of working medium with high parameters [1].
* Labyrinth seals around the shaft to meet stringent IP69k ratings.
Through its Qualiseal Technology division it also produces a full range of face seals, labyrinth seals and mating rings.