Numerical Analysis And Experimental Study Of Metal Ferrofluidic Seal

Ferrofluidic seal is a kind of excellent rotary seal with high reliability,low power consumption and character of zero leakage.In view of the problem that the existing ferrofluidic seal cannot apply to a variety of liquid media and high temperature condition,a study to propose the metal ferrofluidic seal was carried out.The metal ferrofluidic seal can be applied to a variety of sealing media and high linear velocity conditions with low power dissipation.Suitable carrier liquid and magnetic particles of the magnetic fluid were chosen and metal ferrofluid was prepared.Not only the stability,evaporation characteristics,compatibility of media,magnetization properties were tested,but the change of viscosity with the temperature and fitting formulas were obtained.The existing ferrofluidic seal structure was improved to facilitate installation and a new structure of metal ferrofluidic seal was proposed.In order to compute sealing ability,the magnetic field strength and magnetic flux intensity distribution of metal ferrofluidic seal were analyzed with ANSYS.A study was carried out on the influence of rotational speed,tooth height,tooth width,sealing gap,thickness of rotating ring thickness and size of cooling tank on sealing capacity.The sealing ability increases at first then decreases as tooth height,tooth width and rotating ring thickness rise.Eventually,multi-parameter synthesis optimization result was attained which lays a foundation for structure design of experiment deviceThe heat transfer analysis model of metal ferrofluidic seal was built by FLUENT to analyze the temperature field distribution and heat generation rules.Besides,the friction heat and power consumption were studied.According to the analysis of the influence of the rotational speed,tooth height,tooth width and sealing gap on device,the variation of the temperature of metal ferrofluid and permanent magnet and power consumption with above parameters were obtained.It was found that the power consumption and temperature increase with the rise of speed and tooth width,but decrease with the growth of seal gap,while the change of tooth height makes no difference on them.Sealing test system was designed and manufactured to validate its application effect in actual working condition.At the same time,magnetic grease being used as a control,variation regularity of sealing ability and heat transfer performance was obtained,which was compared with the simulation results to verify the validity.In this paper,through the performance analysis and experimental study of metal ferrofluidic seal,the practical effect of which is verified.It can provide a certain research basis and ideas for the study of magnetic fluid carrier and accumulate experience for the improvement of the structure of ferrofluidic seal.Besides,the research can make some contribution to enhance the performance of ferrofluidic seal and broaden its industrial application.