The Research Of The Principle Of Heat Dissipation Of Lip Seal

The high working temperature of lip seal which caused by friction with shaft can result in invalidation of lip seal because of the material damage. Researching the principle of heat dissipation of lip seal helps to choose parameters properly. But now the principle hasn't been understood clearly because the process relates to the knowledge of different subjects. Aiming at the invalidation of lip seal with high temperature, the objective of the study is to optimize lip seal's frame about heat dissipation. An axsymmetric two-dimensional model was established to describe the heat dissipation between solid and fluid with Realizable k-εturbulence model by the FLUENT software. The influence of the structure parameters of lip seal on heat dissipation was also computed. In addition, an experimental system for heat dissipation was designed.The heat generated was imported by boundary condition. The results show that with the increase of shaft speed, the temperature on the surface of friction increases gradually, the highest temperature on the surface of friction appears at the center close to air area, while the lowest temperature appears on the endpoint near the engine oil. As a whole, the temperature distribution of air is higher than that of engine oil. The heat generated between lip seal and shaft is dissipated by engine oil and shaft mostly, heat dissipation by air can be neglected. The area which closed with the surface of friction has higher temperature, while the area away from the surface of friction has lower temperature. The temperature of shaft is wholly higher than that of air, which is higher than that of engine oil. The influence of the variation of convection heat transfer coefficient of air on heat dissipation of lip seal is very little,and can be given constant. As the contact width increases, the maximum temperature on the surface of friction decreases. With the increase of force against shaft, the maximum temperature on the surface of friction increases. With the increase of front-angle, the temperature distribution and the maximum temperature on the surface of friction decreases with little effect gradually, while the affect of back-angle variation on the temperature distribution and the maximum temperature on the surface of friction nearly can be ignored. With the increase of shaft hollow, the temperature on the surface of friction increases.