Lubricating oil cooling system for aero-engine turbine support bearing and method thereof

The invention belongs to the technical field of cooling design of aero-engine turbine support bearings, and particularly relates to a lubricating oil cooling system for an aero-engine turbine support bearing and a method thereof, which are used for cooling lubricating oil for the turbine support bearing and can switch the system into a heat exchanger to switch into a working mode when a lubricating oil overtemperature alarm is given. In the working mode, the second lubricating oil heat exchanger is switched in, lubricating oil for the turbine supporting bearing is cooled through fuel oil of the circulating backflow fuel tank, the state of the aero-engine does not need to be improved, the fuel oil supply amount of a combustion chamber does not need to be increased any more, unconstrained operation of the state of the aero-engine can be achieved, mechanical faults are reduced, and flight safety is guaranteed. 本申请属于航空发动机涡轮支撑轴承冷却设计技术领域，具体涉及一种航空发动机涡轮支撑轴承用润滑油冷却系统及其方法，以其对涡轮支撑轴承用润滑油进行冷却，可在润滑油超温报警时，将系统切换为换热器切入工作模式，在该工