Emergency lubrication system for a gas turbine engine

摘要

An emergency lubrication system for a turbine engine includes a reservoir (50) containing a reserve quantity of lubricant (52) and having a lubricant inlet (54) and a lubricant outlet (56) . A lubricant supply line (62) and a lubricant outlet line (66) each have a respective valve (64,68) for regulating lubricant flow into and out of the reservoir. A fluid supply line (70) includes a valve (72) for selectively establishing communication between the reserve quantity of lubricant and a source of pressurized fluid. During normal operation the lubricant outlet valve (68) continuously releases lubricant at a normal rate to the component requiring lubrication while the lubricant inlet valve (64) concurrently admits fresh lubricant into the reservoir (50) . During abnormal operation, the lubricant inlet valve (64) closes in response to abnormally low lubricant pressure outside the reservoir thereby preventing backflow of reserve lubricant out of the reservoir. The fluid inlet valve (72) opens to admit pressurized fluid into the reservoir thus pressurizing the reserve lubricant. The lubricant outlet valve (68) opens or cycles open and closed in response to a command from a controller (26) so that the pressurized fluid forces lubricant through the outlet (56) as a subnormal rate, which persists until the lubricant reserve is substantially depleted.