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Improved sealing system

IP.com Disclosure Number: IPCOM000241379D
Publication Date: 2015-Apr-21
Document File: 1 page(s) / 13K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention improves the performance of a coaxial MSE sealing system by taking advantage of the static side of the seal. Current assemblies tend to have active sealing components such as MSE jackets, cup seals or vee-rings that are essentially symmetrical across their cross section. For applications where the seal and mating parts remain motionless relative to each other, this geometry has been shown to be adequate. However, in cases where one of the sealing surfaces can be in motion relative to the seal, and especially if the motion can occur with significant differential pressure across the seal, the quasi-symmetric geometry is a weak point in the seal design which can lead to poor sealing performance and reduced seal life. The proposed invention takes advantage of the static side of a sealing system to increase the stability of the seal assembly components and increase the flexural range of the dynamic sealing lip of an MSE seal. The idea of the static side of a sealing element having a different geometry is not new. T-seals are an example of this, with the portion of the seal engaging the static side of the gland being very wide, and a slim section engaging the sealing surface that is subject to motion. By taking advantage of the static side by increasing to an interference fit and thereby forcing the cantilever spring to only accommodate variation on the dynamic side, the dynamic sealing leg is capable of greater flexure. The larger static side also can be used to eliminate ┬┐rocking┬┐ type instability of the MSE element in pressure and loading cases where the seal elements shift axially in the gland. While originally envisioned as a piston type seal where the I.D. of the seal assembly is restrained within a gland and the O.D. surface provides sealing against a movable surface, the configuration could be easily inverted so that the static portion of the seal assembly was on the O.D. and the I.D. surface would seal against a polished rod or similar.

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Improved sealing system

The invention improves the performance of a coaxial MSE sealing system by taking advantage of the static side of the seal.

Current assemblies tend to have active sealing components such as MSE jackets, cup seals or vee-rings that are essentially symmetrical across their cross section. For applications where the seal and mating parts remain motionless relative to each other, this geometry has been shown to be adequate. However, in cases where one of the sealing surfaces can be in motion relative to the seal, and especially if the motion can occur with significant differential pressure across the seal, the quasi-symmetric geometry is a weak point in the seal design which can lead to poor sealing performance and reduced seal life. The proposed invention takes advantage of the static side of a sealing system to increase the stability of the seal assembly components and increase the flexural range of the dynamic sealing lip of an MSE seal. The idea of the static side of a sealing element having a different geometry is not new. T-seals are an example of this, with the portion of the seal engaging the static side of the gland being very wide, and a slim section engaging the sealing surface that is subject to motion. By taking advantage of the static side by increasing to an interference fit and thereby forcing the cantilever spring to only accommodate variation on the dynamic side, the dynamic sealing leg is capable of greater flexure. The larger static side...