Numerical and experimental investigation of the converging embedded magnetic fluid seal with a large diameter shaft and large sealing gap

In order to enhance the pressure resistance of the ordinary magnetic fluid (MF) seal (MFS) with a large diameter shaft and large sealing gap, the converging embedded MFS (EMFS) device with a large diameter shaft and large sealing gap is designed in accordance with the principle of EMFS. A combination of numerical simulations and experimental studies is used to examine the effect of important factors such as the size of the sealing gap and the pole teeth (PT) number on the ability of the converging EMFS to pressure resistance. The findings indicate that the experimental pressure resistance of the converging EMFS with a large diameter shaft and large sealing gap is basically consistent with the theoretical pressure resistance. As the radial and axial sealing gaps increase, the pressure resistance of the converging EMFS decreases. With the increase of the number of radial PT, the pressure resistance of the converging EMFS first increases and then decreases. With the increase of the number of axial PT, the pressure resistance of the converging EMFS first increases, then decreases and then increases. The pressure resistance of the converging EMFS remains unchanged with the increase of the speed.