Article,

A New Approach to Analyze the Hydrodynamic Flow in Sealing Aids—PTFE-Lip Seals with Spiral Grooves

, and .
Tribology Transactions, Taylor & Francis, 50 (3): 435—443 (2008)317.2.
DOI: 10.1080/10402000701260955

Abstract

Elastomeric lip seals are frequent and reliable machine components. However, their range ofapplication is limited. Ifthese limits are reached, the seals are often replaced by PTFE sleevetype seals with spiral grooves (PTFE lip seals). The basic geometries and types ofgrooves have an empiric origin. An exact analysis and with it the knowledge of their function does not exist. This paper presents a project that aims to analyze and optimize the function and design ofthese grooves. A test rig developed at the Institute ofMachine Components at the University of Stuttgart visualizes the flow in PTFE lip seals and between hydrodynamic sealing aids of elastomeric lip seals. The flow is observed and recorded through a glass hollow shaft, which allows investigating the behavior in all directions and areas of the lip. This knowledge is essential to develop new geometries and to verify complex fluid dynamic analysis.

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