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Home > Issues > RetrieveSealing Behavior Research on the Radial Ferrofluid Seal Structure with Oblique Teeth
Journal of Magnetics, Volume 27, Number 1, 31 Mar 2022, Pages 79-87
Fang Yuan (School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University), Siqi Wang * 
(School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University), Decai Li (School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University), Long Chen (School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University)
(School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University), Decai Li (School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University), Long Chen (School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University)
Abstract
Considering various unstable factors when the large-diameter spindle operates at a high speed, such as eccentricity,
centrifugal force, etc., the ordinary ferrofluid seal structures will show poor sealing performance. This
paper proposes an axial-radial bidirectional ferrofluid seal structure with radial oblique teeth to improve the
sealing performance. The pressure resistance of the radial ferrofluid seal structure in the magnetic circuit is
theoretically analyzed. The magnetic flux distribution characteristic in the gap of the oblique teeth is studied by
magnetic field simulation. According to the analysis results of the magnetic induction intensity, to obtain the
larger theoretical pressure resistance, the optimal angle of oblique teeth is 77.87°, 64.28° and 62.81° under the
radial seal structure with different gaps of 0.1 mm, 0.15 mm and 0.2 mm, respectively. In addition, simulation
analysis is carried out to obtain the fluid pressure and velocity distribution of the radial ferrofluid seal structure
with different oblique teeth angles. When the oblique teeth angle is small, the pressure drops and gas flow
speeds in the ferrofluid area are all lower, and the pressure resistance is higher.
centrifugal force, etc., the ordinary ferrofluid seal structures will show poor sealing performance. This
paper proposes an axial-radial bidirectional ferrofluid seal structure with radial oblique teeth to improve the
sealing performance. The pressure resistance of the radial ferrofluid seal structure in the magnetic circuit is
theoretically analyzed. The magnetic flux distribution characteristic in the gap of the oblique teeth is studied by
magnetic field simulation. According to the analysis results of the magnetic induction intensity, to obtain the
larger theoretical pressure resistance, the optimal angle of oblique teeth is 77.87°, 64.28° and 62.81° under the
radial seal structure with different gaps of 0.1 mm, 0.15 mm and 0.2 mm, respectively. In addition, simulation
analysis is carried out to obtain the fluid pressure and velocity distribution of the radial ferrofluid seal structure
with different oblique teeth angles. When the oblique teeth angle is small, the pressure drops and gas flow
speeds in the ferrofluid area are all lower, and the pressure resistance is higher.
Keywords: ferrofluid seal; oblique tooth; magnetic field simulation; flow field simulation
DOI: https://doi.org/10.4283/JMAG.2022.27.1.079
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