Air purge system for gas turbine engines

Abstract From the Canadian patent

Apparatus is disclosed for automatically purging oil from the jets supplying lubricant to a selected group of bearings and seals in a turbine engine subsequent to a shutdown. Purging prevents oil from coking as a result of heat soak back after the engine stops. To accomplish this task pressurized, air is tapped from the air plenum just downstream of the engine compressor stage. To pressurized air is stored in a small tank using an air check valve in the incoming line so that the air tank is charged to the highest pressure achieved by the engine compressor during its operation. At the outlet of the air tank there is connected one end of an air supply line whose second end is in communication …