Engine lubricating oil supply system

Abstract

The invention discloses an engine lubricating oil supply system which comprises a lubricating oil tank, an oil supply pump and an oil return pump. The system is characterized by further comprising anoil drawing pump arranged before the oil supply pump. The flow amount of the oil drawing pump is 50%-60% of that of the oil supply pump. Lubricating oil of the lubricating oil tank is supplied to an engine after being pressurized through the oil drawing pump and the oil supply pump, and drawn back through the oil return pump after lubricating and cooling a gear, a bearing and the like. A part of return oil of the engine enters the oil supply pump along a first flowing way 1 to continue circulating, a part of the return oil flows back to the lubricating oil tank along a second flowing way 2, the flow amount of the first flowing way 1 and the flow amount of the second flowing way 2 are adjusted through a flow limiting nozzle arranged on the second flowing way 2, and it is ensured that the flow amount of the second flowing way 2 accounts for 80%-90% of the total flow amount of the return oil. According to the engine lubricating oil supply system, the two-stage pump is adopted for pressurizing the lubricating oil, most return oil of the engine does not flow into the lubricating oil tank, and directly enters the oil supply pump to continue circulating, the circulating route is short, preheating of the lubricating oil is benefitted, and starting resistance of the lubricating system is reduced.

Description

technical field [0001] The invention relates to an aero-engine lubricating oil supply system, which is especially suitable for some engines working at high altitude and low Mach number for a long time. Background technique [0002] Aeroengines are mainly based on mechanical transmission of power, and a lubricating oil system needs to be designed to meet the needs of engine lubrication and cooling. Whether the lubricating oil system works normally is related to the safety of the entire engine. When the engine is working at high altitude, since the atmospheric pressure at high altitude decreases continuously with the increase of altitude, in order to ensure the normal operation of the lubricating oil system, measures must be taken to ensure sufficient pressure in the bearing cavity. However, when some engines work at high altitude and low Mach number, the inlet pressure of the engine decreases, the engine state is small, the internal pressure decreases, and the bleed air press...

AI Technical Summary

Problems solved by technology

[0005] Solve the problem that the fuel supply system cannot work normally due to low pressure in the bearing cavity when the aero-engine is working at high altitude

Images