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| Investigation into sealing performance of lip seals with surface texture when considering temperature effect |
| ZHANG Fuying1,2, YANG Junmei1,2*, SHUI Haoche1,2, DONG Chengcheng1,2 |
| 1. College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China; 2. Key Laboratory of Integrated Design and on Line Monitoring of Light Industry and Food Engineering Machinery and Equipment in Tianjin, Tianjin 300222, China |
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Abstract Based on elastohydrodynamic lubrication theory and pumping mechanism of rotary shaft seal, a numerical mixed lubrication model of sealing area in an oil seal was established by comprehensively considering the influence of surface roughness and texture of seal lip. In the model, fluid mechanics, deformation analysis, contact mechanics, temperature and energy conservation equation and viscous-temperature equation are coupled. By solving the numerical equations iteratively, the temperature distributions in oil seal lips with different surface textures(circular, square, equilateral triangle)and the maximum temperatures of oil seal lip under different rotational speeds were obtained. The effects of surface texture on temperature of oil seal contact surfaces and the influences of temperature rise on the sealing performance of the oil sea such as pumping rate, oil film thickness, friction torque, etc were compared and analyzed. The results show that with the increase of rotational speed, the maximum lip temperature rises linearly, and the surface texture obviously raises the lip temperature. When the oil seal is working, the temperature of the friction surfaces rises sharply from both sides to the middle, and the temperature in the texture area increases noticeably, but there is no statistics significance between three textures. The temperature rise leads to a decrease in pumping rate, oil film thickness and lip sealing pressure in the oil seals with three textures, and significantly degrades their sealing perfor-mance.
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Received: 26 March 2019
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