Groove-mounted seals with integral antiextrusion device
OwnerLarry Russellinventor
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Abstract
The present invention relates to an elastomeric seal having an antiextrusion device molded integrally into or onto the low pressure side of the seal. The antiextrusion device is made of a corrugated strip integrally embedded into the elastomeric seal. One embodiment of the invention has the strip positioned with the midplane of its corrugations normal to the mating seal surfaces and parallel to the midplane of the seal groove. Another embodiment of the invention has the midplane of the corrugations canted within the seal. The antiextrusion device is applicable to annular seal rings, linear seals, or seals of more complex configuration.
Claims29
An antiextrusion device fully embedded and integral with an elastomeric seal mounted in an annular groove, the antiextrusion device comprising a rigid corrugated material substantially in a circular annular planar configuration and having multiple corrugations centered about a midplane of the antiextrusion device, whereby the corrugations enhance the bending strength of the antiextrusion device for loads normal to the plane of the device while reducing the circumferential stiffness of the antiextrusion device.
An antiextrusion device fully embedded and integral with an elastomeric seal mounted in an annular groove, the antiextrusion device comprising a rigid corrugated material substantially in a right frustoconical configuration and having multiple corrugations displaced about a frustoconical surface, whereby the corrugations enhance the transverse bending strength of the antiextrusion device while reducing the circumferential stiffness of the antiextrusion device.
An annular elastomeric seal comprising:
- an annular elastomeric body having a first surface for sealingly engaging a comating sealing surface to contain a pressure, two opposed end surfaces, wherein the elastomeric body is mountable in an annular groove having opposed sides for engaging the opposed end surfaces of the elastomeric body;
- and
- an antiextrusion device comprised of a rigid corrugated material having a repeatable uniform pattern of multiple corrugated alternating wave crests and troughs, said antiextrusion device fully embedded in and bonded to the elastomeric body such that individual wave crests lie in radial planes;
- whereby the corrugated wave crests and troughs cooperate with the elastomeric body to enhance a resistance of the seal to displacement parallel to the comating sealing surface in response to the contained pressure while reducing a circumferential stiffness of the seal.
A linear elastomeric seal comprising:
- a linear elastomeric body having a first surface for sealingly engaging a comating sealing surface to contain a pressure, two opposed lateral surfaces, wherein the elastomeric body is mountable in a groove having opposed sides for engaging the opposed lateral surfaces of the elastomeric body;
- and
- an antiextrusion device comprised of a rigid corrugated material having a repeatable uniform pattern of multiple corrugated alternating wave crests and troughs, said antiextrusion device fully embedded in and bonded to the elastomeric body such that individual wave crests are perpendicular to a linear axis of the seal;
- whereby the corrugated wave crests and troughs cooperate with the elastomeric body to enhance a resistance of the seal to displacement parallel to the first surface of the seal and normal to the linear axis of the seal in response to the contained pressure while reducing an axial stiffness and a lateral bending stiffness of the seal.
Dependencies are inferred from the claim text.