Design and performance analysis of magnetic fluid dynamic seals for geotechnical centrifuge
With the continuous innovation and application of science and technology,the technical requirements of high-end equipment for dynamic seals are becoming more and more demanding,such as large gap,large size,and high line speed dynamic seal technology has become a hot spot of application research.In this paper,according to the requirements of geocentrifuge vacuum dynamic seal,the monodisperse Fe3O4 nanoparticles were prepared by thermal decomposition method,and the Fe3O4 nanoparticles were uniformly dispersed into the carrier fluid by high-speed emulsion dispersion technology,and the highly stable magnetic fluid was obtained.The morphology,size and magnetism of Fe3O4 nanoparticles were characterized by XRD,TEM and vibrating sample magnetometer.The influence of saturation magnetization of magnetic fluid on magnetic circuit and sealing ability was analyzed.After analyzing the test data,it is found that the magnetic saturation strength of the magnetic fluid is the key factor of the large gap seal.
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