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Life tests of a rotary single-stage magnetic-fluid seal for shipbuilding applications

Abstract

Use of the magnetic fluid seal technology in water is much more difficult technological problem in comparison to gas or vacuum environment. Some seals constructed up to time been are designed as hybrid, two stage sealing structures with shields or mechanical seals used as protection measures to the magnetic fluid seal. Anyway, there is always problem with immediate contact between magnetic fluid and the environmental liquid. In the paper are presented results of experiments carried out with one stage rotating magnetic fluid seal operating in immediate contact with utility water. The special test procedures have been elaborated and practically used, with the aim to define main characteristics of magnetic fluid seals and to simplify experiments. These characteristics were: critical pressure, critical motion velocity and working life of the seal. Four grades of commercial, silicon based magnetic fluids of hydrophobic properties were tested in a single stage sealing system. The results of tests are presented in the form of tables and diagrams. It is concluded that hydrophobic commercial magnetic fluids could be efficiently used in rotating shaft seals however in a limited range of motion velocity.

Keywords:

shaft sealing, magnetic fluid, utility water, seal durability, critical pressure, critical motion velocity

Details

Issue
Vol. 18 No. 2(69) (2011)
Section
Latest Articles
Published
04-07-2011
DOI:
https://doi.org/10.2478/v10012-011-0012-0
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Open Access License

This journal provides immediate open access to its content under the Creative Commons BY 4.0 license. Authors who publish with this journal retain all copyrights and agree to the terms of the CC BY 4.0 license.

 

Authors

  • Leszek Matuszewski

    Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology
  • Zbigniew Szydło

    AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics

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