Importance

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Abstract

Mechanical face seal has a first sealing mounted in fixed axial and rotational relationship and sealed with respect to a housing and a second sealing ring mounted in fixed rotational relationship but movable axially with respect to a shaft. The second sealing ring being sealed with respect to the shaft by means of a bellows unit. One end of the bellows unit being engaged by a first drive band which applies a radial load to the end of the bellows unit forcing it into driving and sealing engagement with the shaft and the other end of the bellows unit being engaged by a second drive band which applies a radial load to the end of the bellows unit forcing it into driving and sealing engagement with the second sealing ring. The inner ends of the drive bands are of equal diameter and have axially extending castellations, the castellations of one drive band intermeshing with the castellations of the other drive band, whereby the drive bands may be telescoped and torsional loads may be reacted between the shaft and the second sealing ring by the ends of the bellows unit and the drive bands. A spring acts between the drive bands to bias them apart and to urge opposed sealing faces of the first and second sealing rings into sealing engagement.

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First Claim