Importance

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Abstract

A shaft sealing assembly containing a liquid lubricant uses an arrangementhich can accommodate shaft-eccentricities and vibratory movements which cause radial deflections of the shaft, without impairing the efficiency of sealing of the assembly. The assembly is of a type using a housing in which two flexible sealing rings are spaced apart from each other and mounted to be stationary on the shaft, at least one sealing ring being supported by a mounting ring. The mounting ring is capable of radially being displaced within the housing, when there is shaft-eccentricity, or when radial vibratory movements of the shaft occur. The mounting ring is nonrotatably supported from the inside of the housing by a resilient annular wall made of a sealing material. The arrangement comprises at least one inner annular chamber containing the liquid lubricant, and at least one outer annular chamber disposed radially outside the mounting ring, the two annular chambers being provided with a connecting fluid passage. Rotation of the shaft causes the lubricant from the inner chamber to be guided by deflectors into the outer chamber via the fluid passage. The lubricant is cooled in the outer chamber and led back into the inner chamber. The shaft sealing assembly is particularly useful as an aft-stern tube seal of a vessel, providing seal-safety and long seal-life.

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First Claim