Biased air film riding seal with reduced leakage in event of housing breach for shared engine lubrication accessory gearboxes

摘要

A system (100) includes a case (146), a stator (142), a ring seal (152), and a rotor (172) and is configured to pump air out of a housing. The case (146) is mounted on the housing. The stator (142) is mounted within the case (146) and has two sides, an inner diameter (149) and an outer diameter (151), where the first side faces the case (146). The ring seal (152) is disposed between the stator first side and the case (146). The rotor (172) is mounted on a shaft (130) and has a side facing the stator first side. The rotor side has grooves (188), an inner and outer peripheral surfaces, and is configured to pump air from the outer peripheral surface to the inner peripheral surface to thereby pump air out of the housing. The stator inner diameter (149) is configured and the ring seal (152) is positioned such that separation forces are substantially equal to or less than closing forces during a system breach.