US 6,142,729 AGranted

Sealing device for a turbomachine bearing chamber

AssigneeTechspace Aero S.A.

InventorsHung Quac Tran, Lorenzo Pacchioni

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Abstract

A sealing device for a turbomachine bearing chamber in which a bearing is mounted between a sleeve secured to a rotary shaft and a casing defining said bearing chamber, said sealing device comprising a labyrinth seal disposed on the sleeve at the junction with an adjacent air chamber, a static carbon ring which is not in contact with the shaft and is retained axially in position in a fixed annular support, and a rotary ring which is driven by the sleeve and which is centred without clamping on the sleeve by means of a ring seal and is retained axially in position by a flat annular spring, the rotary ring having a radial surface which faces and co-operates with a radial surface of the carbon ring and which is formed with lift grooves such that, during operation, a substantially frictionless sealing is effected between the two radial surfaces.

Claims7

Dependent claims

A sealing device for a bearing chamber in a turbomachine wherein a sleeve is rigidly secured to a rotary shaft and a rolling bearing is mounted between said sleeve and a casing defining an oil chamber in which said rolling bearing is located, said sealing device separating said oil chamber from an air chamber of said turbomachine and comprising:

a labyrinth seal mounted on a portion of said sleeve which is disposed adjacent said air chamber;
a static carbon ring having no contact with said shaft;
a fixed annular support on which said static carbon ring is axially located;
a first radial surface on said static carbon ring;
a rotary ring connected to said sleeve so as to rotate therewith;
a seal centering said rotary ring on said sleeve without clamping;
annular spring means for retaining said rotary ring axially in position on said sleeve;
and a second radial surface on said rotary ring facing and co-operating with said first radial surface on said static carbon ring;
said second radial surface being provided with lift grooves whereby, during operation, a substantially frictionless sealing is effected between said first and second radial surfaces.

6 more elements

Dependencies are inferred from the claim text.