| 摘要 |
A mechanical seal assembly for sealing between a rotating shaft and a housing wall through which it passes with the mutually engageable rotating and stationary sealing surfaces being located in a radial plane with respect to the axis of the rotating shaft and said sealing surfaces being carried by sealing members on the shaft and wall respectively. The sealing member carried on the shaft is mounted on an anchoring member anchored to the shaft, and is telescopingly engaged with the anchoring member so as to rotate with the shaft at all times and be movable toward the stationary sealing surface to sealingly engage the same. This provides the primary seal. There are seals provided also between the anchoring member on the shaft and the shaft inself, and between the anchoring member on the shaft and the rotating sealing member that is telescopingly engaged therewith, one of these seals at least being in the form of two axially spaced O-rings. These O-rings serve the purpose of exerting a substantial and constant force to prevent cocking and insure alignment of the parts between which they seal relative to one another. The O-ring and O-ring groove nearest the primary seal and the entrapped air space between the two O-rings creates a thermal barrier that protects the other O-ring of the same pair from excessive heat and resulting deterioration.
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