Importance

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Abstract

A gas seal construction for use on a pump to create a seal between a relatively rotatable pump shaft and housing. A flow barrier arrangement is disposed in close surrounding relationship to the shaft and cooperates with the surrounding housing axially between the seal and the pump chamber for minimizing ingress of pump liquid into the seal chamber during both static and dynamic conditions. The barrier arrangement includes an annular barrier member nonrotatably secured to the shaft and cooperating with an annular shroud which is secured to the housing. The barrier member and shroud have opposed truncated conical surfaces which define a narrow annular passage therebetween which slopes outwardly away from the seal chamber toward the pumping chamber and, at the large diameter end thereof, communicates with an annular sealing zone or dam which is defined between the relatively rotatable barrier member and housing for further restricting ingress of pumping fluid into the seal chamber.

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First Claim