滑油密封兼容性对航空发动机的影响分析

为了探明不同级别的II型合成滑油密封兼容性对航空发动机的影响,通过对MIL-PRF-23699和SAE-AS-5780规范的解读,发现高温油在密封兼容性上的缺陷。将航空发动机橡胶类密封件浸泡在不同滑油中的实验说明了高温油中的密封件在超过120℃,1 800 h后更容易产生膨胀和降解现象。CFM56-5B/-7B 3号轴承前封严脱胶故障的分析表明,PTFE的脱落和发动机使用的高温油有关系,PTFE的脱落可导致发动机受到污染和大量漏滑油。

Influence of Oil Seal Compatibility on Aero-Engine

In order to clarify the effects of different levels of Type II synthetic oil seal compatibility on aero-engines, the defects of High Thermal Stability Grade (HTS) in oil seal compatibility were found through the interpretation of the MIL-PRF-23699 and SAE-AS-5780.The experiment of soaking the aero-engine rubber seal in different oils indicates that the seal in the High Thermal Stability Grade is more likely to cause expansion and degradation at temperatures in excess of 120 degrees Celsius and 1800 hours. The analysis of CFM56-5B/-7B NO.3 bearing forward seal PTFE disbond fault shows that PTFE disbond is related to the HTS oil, and it leads to engine pollution and oil leakage.