Patent ID: 6368077
Filing Date: 2002-04-09
Classification: F01D,F02C,F04D,F05D

Abstract:
A dual phase seal for limiting oil leakage from a lubricated bearing of a rotor support to a gas reacting wheel of a rotor operational over an extended speed range, said seal comprising:an outer cylinder on the rotor between the bearing and the wheel; an inner cylinder carried by tile rotor Support and surrounding the outer cylinder with close clearance; auger seal grooving formed in one of the cylinders a portion thereof toward the bearing, and the auger seal grooving comprising a multi-start helical thread cut in one of the cylinders; labyrinth seal grooving formed in one of the cylinders on a portion thereof toward the wheel; and a pressure air supply for supplying air to the labyrinth seal grooving at a pressure which is reduced at rotor speeds in a lower portion of the rotor speed range.