Secondary oil system

Details Secondary oil system Secondary oil system

1990-07-23

1991-09-10

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

With lubricators

184 611, 415175, F01M 118, F02C 706

Patent

active

050463063

ABSTRACT:
A secondary oil system for a gas turbine engine includes a reservoir in a bearing sump of the engine and a mist tube extending across the top of the reservoir and connected at one end to a compressed air source and at the other end to a nozzle in a bearing sump. A shut-off valve responsive to primary system oil pressure normally blocks the mist tube but unblocks the latter when primary system pressure is low. The compressed air pressurizes the reservoir when the shut-off valve is open and forces oil through a pick-up tube to another orifice in the mist tube located at a venturi passage. Oil issuing into the mist tube mixes with high velocity air in the venturi passage to form a mist which is conducted by the mist tube to the nozzle from which it is directed at a rotor shaft bearing. The orifice at the venturi passage is at a lower elevation than the pressurizing orifice relative to the bottom of the reservoir and defines the normally filled oil level in the reservoir.

REFERENCES:
patent: 3779345 (1973-12-01), Bernes et al.
patent: 4284174 (1981-08-01), Salvana et al.
patent: 4717000 (1988-01-01), Waddington et al.
patent: 4741155 (1988-05-01), McCarty
patent: 4858426 (1989-08-01), Holcomb
patent: 4858427 (1989-08-01), Provenzano
patent: 4888947 (1989-12-01), Thompson
patent: 4917218 (1990-04-01), Murray

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