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Pumping effect for rotary lip seal |
ZHANG Fuying<sup>1,2</sup>,CHEN Jianlei<sup>1*</sup>,DUAN Jingying<sup>1</sup>,SONG Nana<sup>1</sup> |
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 the microcosmic and macroscopic pumping principle of the rotary shaft lip seal, using the one-dimensional Reynolds equation of hydrodynamics and the oil film thickness expression, the pumping rate equation is deduced on the assumption that the contact pressure distribution of seal lip would be approximately triangular. The influence of installation parameters(contact width, axial force), structure parameters(oil side lip angle, air side lip angle)and operation parameters(rotational speed)on the pumping rate and sealing performance is calculated and analyzed. The results show that the pumping rate of the two oil seal models before and after optimization is greater than zero to meet the sealing requirement. When the axial force is constant, the pumping rate increases with the increase of contact width; when the contact width is unchanged, with the increase of the axial force, the friction torque of oil seal lip increases, the pumping rate gradually decreases and the amplitude of variation is small. For two rotary lip seal models, when the air side lip angle remains unchanged, the pumping rate significantly increases with the increase of oil side lip angle; when the oil lip angle is constant, the pumping rate gradually decreases as the air side lip angle increases. As the rotating speed increases, the dynamic pressure effect of oil seal lip increases, and the pumping rate increases. Compared with the two kinds of oil seals, the optimized oil seal has better pumping effect and sealing performance.
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