Design and analysis of combined standard ferrofluid and centrifugal seals

PurposeFerrofluid seals are known for their low friction torque and high tightness. However, they have some limitation due to the allowable rotational speed. The work presented here analyzes the performance of newly designed seals which are a combination of a ferrofluid and a centrifugal seal. The new seals can operate at high speeds. The purpose of this study is to theoretically predict the performance of combined seals.Design/methodology/approachThree seals were designed and selected for analysis. A version of the seals with a nonmagnetic insert is also considered, the purpose of which is to facilitate the installation and return of ferrofluid during low rotational speeds. The analyses were based on combining the results of numerical simulation of magnetic field distribution with mathematical models.FindingsA combination of ferrofluid sealing and centrifugal sealing is possible. Analyses showed that the combined seal could hold a minimum pressure of 190 kPa in the velocity range of 0-100 m/s. The problem with this type of seal is the temperature.Originality/valueNew seal designs are presented. Key parameters that affect the seal operation are discussed. A methodology that can be used in the design of such seals is presented.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2023-0221/.

Automated summary

A new type of seal that combines ferrofluid sealing and centrifugal sealing is analyzed and its performance is theoretically predicted. The results show that the combined seal can hold a minimum pressure of 190 kPa in the velocity range of 0-100 m/s.