Influence of Yield Stress on the Starting Torque of Magnetic Fluid Seal

HE Xinzhi;WANG Zhibin;LI Decai

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  • Sponsored by: China Association for Science and Technology (CAST)

    Editor-In-Chief: Xu Yida

    ISSN 1000-1093

    　

  • Hosted By: China Ordnance Society

    Published By: Acta Armamentarii

    CN 11-2176/TJ

Acta Armamentarii, a Chinese monthly journal, was first published in 1979. The journal is supervised by China Association for Science and Technology, sponsored by China Ordnance Society，and edited and published by Editorial Board of Acta Armamentarii. The Journal is included in all important domestic databases，and also collected by Engineering Index (EI, USA), Chemical Abstracts (CA, USA), Science Abstracts (SA, UK）, Abstract Journal (AJ, Russia), and Current Bibliography on Science and Technology(CBST).Acta Armamentarii has been selected into the journal Of Ordnance Science and Technology (Weapons Industry) Field Of High Quality Scientific and Technological Periodical Classification Catalogue (2022 edition), ranking T1, and the journal of Automotive Engineering Field of High Quality Scientific and technological Periodical classification Catalogue, ranking T2.
Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (4) : 892-898. DOI: 10.12382/bgxb.2021.0250
Paper

Influence of Yield Stress on the Starting Torque of Magnetic Fluid Seal

  • HE Xinzhi1， WANG Zhibin1， LI Decai2
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Abstract

Magnetic fluid seal is the most mature application of magnetic fluid. The sealing performance of magnetic fluid seal changes with the extension of standing time, especially the phenomenon that the starting torque of the magnetic fluid seal increases with the extension of standing time may cause difficulty in starting the seal or even damage. In order to explore the mechanism of this phenomenon, the relations among the starting torque of magnetic fluid seal with temperature, standing time, the amount of magnetic fluid injected and the pressure exerted on the magnetic fluid are experimentally studied, and the changing reasons of the starting torque of magnetic fluid seal are theoretically analyzed. The results show that the lower the temperature is, the longer the standing timeis , the greater the amount of magnetic fluid injected is, and/or the lower the pressure is, the greater the starting torque is. The essence of this phenomenon is thatthe particles in magnetic fluid form chain-like structures under the action of magnetic field. Yield stress needed to break chain-like structures is the cause of changing starting torque.

Key words

magneticfluidseal / yieldstress / startingtorque / chain-likestructure

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HE Xinzhi, WANG Zhibin, LI Decai. Influence of Yield Stress on the Starting Torque of Magnetic Fluid Seal. Acta Armamentarii. 2022, 43(4): 892-898 https://doi.org/10.12382/bgxb.2021.0250

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