Compound seal with pressure equalization aperture
AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
InventorsGuy d'Agostino, Andre Dhainaut, Daniel G. A. Kettler, Henry R. Leclerc
Life of this patent
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Abstract
A compound seal for affecting a seal on a translating shaft movable within a sleeve to separate high pressure and low pressure zones. The compound seal includes a sealing member and a clamping member disposed in a groove formed in one of the elements. The sealing member defines sealing sides which cooperate with one of the sides of the grooves and with the other of the elements. The clamping member cooperates with the bottom and the high pressure side of the groove, and with the sealing member so as to exert a force thereon extending substantially along the bisector of an angle defined by the sealing sides.
Claims17
A compound seal for effecting a seal between a shaft element having a longitudinal axis and a sleeve element wherein one of the elements is movable with respect to the other of the elements and defines a high pressure zone and a low pressure zone comprising:
- (a) an annular groove defined by one of the elements, the groove having a low pressure side, a bottom and a high pressure side;
- (b) a sealing member disposed in the annular groove, the sealing member having a first sealing side bearing against the low pressure side of the annular groove, a second sealing side bearing against the other of the elements and at least a third side extending substantially perpendicular to a bisector of an angle subtended by the first and second sides;
- (c) an annular clamping member bearing against the bottom and the high pressure side of the groove, and against the third side of the sealing member so as to exert a force on the sealing member in substantially the direction of the bisector so as to urge the first and second sides in sealing contact with the low pressure side and the other of the elements, respectively;
- and,
- (d) at least one aperture definded by the sealing member and extending in a generally radial direction on either side of the clamping member so as to allow equalization of pressure on either side of the clamping member.
Dependencies are inferred from the claim text.