某微型车发动机排气管连接密封环结构优化

Structural Optimization of the Sealing Ring Connecting the Exhaust Pipe of a Micro Car Engine

针对某微型车的发动机排气岐管与三元催化器管连接位置(采用的镶嵌式密封环),在市场使用过程出现密封环烧蚀、漏气的现象,通过开发模拟密封环高温环境下的试验台、对压缩弹簧压紧力进行计算和耐久实验,得出了压缩弹簧力衰减、密封环石墨层耐高温性能不足的结论。对压缩弹簧材质和密封环结构进行优化改进,提高了弹簧压缩力、密封环高温的耐久的能力,经过市场验证措施有效。

Aiming at the connection position of the engine exhaust manifold and the three-way catalytic converter tube of a micro car(the inlaid sealing ring is used),the phenomenon of sealing ring ablation and air leakage occurred in the market use process.By developing a simulation of high temperature of the sealing ring,the test bench in the environment,the calculation of the compression force of the compression spring and the durability experiment,the conclusion is drawn that the compression spring force decays and the high temperature resistance of the graphite layer of the sealing ring is insufficient.The material of the compression spring and the structure of the sealing ring are optimized and improved to improve the compression force of the spring and the durability of the sealing ring at high temperature.The measures have been proven effective by the market.