Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1977-06-03
1978-07-11
Ward, Jr., Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
3081871, 415112, 277 53, 277 59, F16J 1540
Patent
active
040997278
ABSTRACT:
A dual labyrinth seal arrangement is provided for controlling the supply of sealing air to a bearing chamber of a gas turbine engine. The bearing chamber housing the bearing for a turbomachine shaft connecting a compressor stage with a gas generator turbine is surrounded by a second chamber. A first of the labyrinth seals is disposed between the shaft and the second chamber so as to reduce the pressure of a supply of high pressure sealing medium passing into the seal chamber. The second set of labyrinth seals are provided between the turbo shaft and the second chamber so as to reduce the pressure of sealing medium passing from the second chamber into the bearing chamber. In particularly preferred embodiments, a majority of the sealing medium is vented from the second chamber and supplied to the working cycle of the gas turbine engine, while the remaining smaller portion is supplied as sealing air into the bearing chamber via the second set of labyrinth seals.
REFERENCES:
patent: 1872251 (1932-08-01), Cowin
patent: 2640319 (1953-06-01), Wislicenus
patent: 2941852 (1960-06-01), Fuller
patent: 3351396 (1967-11-01), Dechslin
patent: 3537713 (1970-11-01), Matthews et al.
Motoren-und Turbinen-Union Munchen GmbH
Ward, Jr. Robert S.
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