초록 ▼

A mechanical seal assembly comprising rotatable and stationary seal rings with faces opposing one another. Means are provided to insure a pressure balance on the outside surface and on the inside surface of the softer seal ring, so that this seal ring does not deflect and distort, and wear in an und

A mechanical seal assembly comprising rotatable and stationary seal rings with faces opposing one another. Means are provided to insure a pressure balance on the outside surface and on the inside surface of the softer seal ring, so that this seal ring does not deflect and distort, and wear in an undesirable manner.

대표청구항 ▼

A mechanical seal assembly for substantially preventing the flow of a fluid along a rotatable shaft from a high pressure region to a lower pressure region, said seal assembly being associated with a housing and comprising: a pair of relatively rotatable seal rings having opposed seal faces, one seal

A mechanical seal assembly for substantially preventing the flow of a fluid along a rotatable shaft from a high pressure region to a lower pressure region, said seal assembly being associated with a housing and comprising: a pair of relatively rotatable seal rings having opposed seal faces, one seal ring being connected to said shaft and the other seal ring being connected to said housing and spaced from said shaft; a back-up ring for one of said seal rings and spaced from said shaft, said back-up ring being constructed of a material having a different modulus of elasticity than said one of said seal rings, said one of said seal rings and said back-up ring having annular mating faces; a first zone communicating with said lower pressure region and bounded in part by the inner surfaces of said one seal ring and said back-up ring; a generally cylindrical member closely surrounding said one of said seal rings and said back-up ring and exposed at its outer surface to high pressure in said high pressure region, said member forming with the outer surfaces of said one of said seal rings and said back-up ring a second zone sealed from high pressure fluid; and passage means communicating said first zone and said second zone so that low pressure fluid exists on the inner and outer surfaces of said one seal ring and said back-up ring and thus substantially prevent distortion of said one of said seal rings and said back-up ring because of pressure differentials between their inner and outer surfaces.