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Mechanical face seal with elastomeric bellows unit and intermeshing drive bands

  • US 5,725,219 A
  • Filed: 03/25/1997
  • Issued: 03/10/1998
  • Est. Priority Date: 03/30/1996
  • Status: Expired due to Term
First Claim
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1. A mechanical face seal for providing a fluid-tight seal between a pair of relatively rotatable components comprising a first sealing ring mounted in fixed axial and rotational relationship and sealed with respect to a first component and a second sealing ring mounted in fixed rotational relationship with respect to a second component, said second sealing ring being sealed with respect to said second component by means of an elastomeric bellows unit, whereby the second sealing ring is movable axially with respect to the second component, a pair of tubular drive bands being mounted coaxially of the bellows unit in axially spaced apart relationship to one another, the outer end of one drive band engaging one end of the bellows unit and applying a radial load thereto forcing it into driving and sealing engagement with said second component and the outer end of the other drive band engaging the other end of the bellows unit and applying a radial load thereto forcing it into driving and sealing engagement with the second sealing ring, the inner ends of the drive bands being of equal diameter and having 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 second component and the second sealing ring by the ends of the bellows unit and the drive bands, resilient means acting between the drive bands to bias them apart and urge opposed sealing faces of the first and second sealing rings into sealing engagement.

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