20.10.2023 Estimating the contact temperature and the pumping rate of rotary shaft seals
New possibilities with an web application
In many applications of rotary shaft seals, engineers want to know about the risk of thermal damaging or leakage due to a low back pumping capability. Both aspects – thermal damaging as well as the back pumping capability – are affected by many influencing factors that also interact with each other. Therefore, precise and robust answers often require time-consuming and expensive test-runs. However, neglecting some influencing factors of minor importance, much faster but still valid answers can be obtained. With this objective, the web application IMA-InsECT has been developed as a free and easy-to-use tool.
Many applications require seals that retain lubricants or other fluids within machines and prevent the entry of dirt into these machines. In applications with rotating shafts, mostly rotary shaft lip-type seals are used [1, 2]. The rotary shaft seal, the surface of the shaft and the fluid, which has to be sealed (often oil), form a dynamic sealing system representing a tribological system [3] that is significantly affected by its periphery and the operating conditions. Elastomeric rotary shaft lip-type seals are standardised in national and international standards, [4, 5, 6]. They consist
of a metal insert to which a sealing lip is attached (Fig. 1). During assembly, the sealing lip and a garter spring are widened by the shaft. The garter spring provides the necessary contact pressure under all operating conditions. The sealing lip is pressed against the shaft surface, forming a slim contact area between its sealing edge and the shaft. The width of the contact area is approximately b = 0.1 to 0.2 mm. The average contact pressure in the contact area is about 1 MPa.
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