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在磁流体液体动密封过程中,转轴的旋转引起磁流体与被密封液体的相对运动,在液-液界面处产生剪切力,使界面出现不稳定现象,易导致磁流体密封耐压能力下降。为进一步研究转轴转速对磁流体液体动密封耐压能力的影响,本文从理论上推导出液-液界面处磁流体所受的剪切力与转轴转速间的关系式,并设计出用于密封液体的磁流体密封结构,搭建了磁流体动密封实验台,实验研究磁流体密封液体的耐压值与转轴转速间的关系。实验表明,随着转轴转速的升高,磁流体密封液体耐压能力下降。转轴从静止到转轴转速为1500 r/min时,耐压值比较稳定,下降较小;转轴转速从1500到3000 r/min时,耐压值明显下降。
In the process of magnetic fluid dynamic sealing, the rotation of the rotating shaft causes the relative movement between the magnetic fluid and the liquid to be sealed, and the shear force is generated at the liquid-liquid interface to make the interface unstable and easily lead to the decrease of the magnetic fluid seal pressure resistance . In order to further study the influence of rotating speed of rotating shaft on the liquid pressure resistance of the liquid magnetic fluid seal, the relationship between the shear force and the rotating speed of the rotating shaft at the liquid-liquid interface is theoretically deduced. Liquid magnetic fluid seal structure, set up a magnetic fluid dynamic sealing test bench, the experimental study of magnetic fluid seal liquid pressure value and the relationship between the speed of the shaft. Experiments show that with the rotation speed of the shaft, the magnetic fluid seal liquid pressure resistance decreased. When the rotation speed of the rotating shaft is 1500 r / min from the standstill to the rotating shaft, the withstand voltage is relatively stable and the decrease is small; when the rotating speed of the rotating shaft is from 1500 to 3000 r / min, the withstand voltage obviously drops.