Bearing chamber pressurization system for a machine
AssigneeROLLS-ROYCE plc
InventorStanley Smith
Life of this patent
Estimating the term…
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.
Claims9
A bearing chamber pressurization system for a machine comprising a bearing chamber, a first air supply means for supplying air at a first, relatively lower pressure, to the bearing chamber for pressurizing the bearing chamber, a second air supply means which is capable of supplying air at a second, relatively higher pressure, to the bearing chamber through a control valve, and a control means which senses the difference between the pressure in the bearing chamber and the first pressure and opens the control valve only when the difference in the two pressures is reduced to a pre-determined level.
Dependencies are inferred from the claim text.