Bearing chamber pressurization system for a machine

Details Bearing chamber pressurization system for a machine Bearing chamber pressurization system for a machine

1982-11-30

1985-02-05

Croyle, Carlton R.

Power plants

Reaction motor

Interrelated reaction motors

60 3908, 184 611, 277 3, 277 29, F02K 306, F02C 706

Patent

active

044971729

ABSTRACT:
A bearing chamber pressurization system for a ducted fan gas turbine engine uses fan delivery air at relatively low pressure and temperature for bearing chamber pressurization. In order to avoid the possibility of a flow reversal in the pressurization air when the fan speed is reduced, a second higher pressure air supply from the core engine is made available under the control of a valve and pressure sensing device, and which comes into operation when the ratio of the bearing chamber pressure and the supply pressure reaches a pre-determined minimum.

REFERENCES:
patent: 2672010 (1954-03-01), Newcomb
patent: 2834619 (1958-05-01), McNab
patent: 3041834 (1962-07-01), Davies et al.
patent: 3171354 (1965-03-01), Sohlemann
patent: 3740057 (1973-06-01), Doyle et al.
patent: 4402180 (1983-09-01), Reid et al.

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