초록 ▼

A seal system for a four cycle engine turbocharger includes dual phase seals for limiting leakage from lubricated rotor support bearings to a turbine and/or compressor wheel of a rotor operational over an extended speed range. The dual phase seal combines features of a labyrinth seal, effective in a

A seal system for a four cycle engine turbocharger includes dual phase seals for limiting leakage from lubricated rotor support bearings to a turbine and/or compressor wheel of a rotor operational over an extended speed range. The dual phase seal combines features of a labyrinth seal, effective in a higher portion of the turbocharger rotor speed range, with features of an auger seal, found to be effective in a lower portion of the rotor speed range. The dual phase seals each include an outer cylinder on the rotor between a bearing and an associated wheel, an inner cylinder carried by a rotor support and surrounding the outer cylinder with close clearance, auger seal grooving formed in one of the cylinders on a portion thereof toward the bearing, labyrinth seal grooving formed in one of the cylinders on a portion thereof toward the wheel, and a pressure air supply to the labyrinth seal at a pressure which is reduced at rotor speeds in a lower portion of the speed range. Air pressure is supplied from an output of the compressor wheel to the labyrinth seal grooving for both the turbine and compressor ends of the rotor shaft. The dual phase seals operate without wear and provide cost effective and dependable rotor sealing at all rotor speeds without fragile or wearing parts, failure of which could cause damage to other components.

대표청구항 ▼

1. 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 Suppo

1. 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.