SIMULATION OF THERMAL PROCESS IN FLUOROPLASTIC SEALS OF THE ROTARY SHAFT FOR DETERMINING LIMITING LOAD-SPEED MODES
N. P. Starostin, M. A. Vasileva
The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia
Keywords: Mathematical modeling, temperature, seals, fluoroplastic, shaft rotation speed, heat exchange, contact
Abstract
The paper discusses the mathematical model for calculating a nonstationary temperature field in the lip seal of rotary shaft. Finite element method is used to compare mathematical models of thermal process with various assumptions. At the same time, function of frictional heat generation is modeled by set of concentrated heat sources. For a seal of filled fluoroplast-4, the validity of assumption on removing almost all heat released by friction into a steel shaft is shown. Calculations show that for seals operating in low temperature conditions, it is necessary to consider dependence of thermophysical properties of sealing material on temperature. A procedure is proposed for determining the load-speed regimes of polymer seals of rotary shaft according to temperature limiting, considering dependence of thermophysical properties on temperature and heat exchange coefficients on sliding speed.
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