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A finite element analysis of the impact of split pole shoes on magnetic liquid sealing performance

Liu Zhiguo
Liu Zhiguo
, 
Zhang Huitao
Zhang Huitao
 and 
Yang Li
Yang Li
   | Mar 22, 2021
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Published Online: Mar 22, 2021
Page range: 103 - 114
Received: Sep 16, 2020
Accepted: Dec 02, 2020
DOI: https://doi.org/10.2478/amns.2021.1.00017
Keywords
© 2021 Liu Zhiguo et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Fig. 1

Radial section diagram of seal structure.
Radial section diagram of seal structure.

Fig. 2

Axial sectional drawing of seal structure.
Axial sectional drawing of seal structure.

Fig. 3

Axial section diagram of optimised seal structure.
Axial section diagram of optimised seal structure.

Fig. 4

Equivalent magnetic circuit diagram of split pole shoe before structural optimisation.
Equivalent magnetic circuit diagram of split pole shoe before structural optimisation.

Fig. 5

Equivalent magnetic circuit diagram of split pole boot structure after optimisation.
Equivalent magnetic circuit diagram of split pole boot structure after optimisation.

Fig. 6

Magnetic force line model.
Magnetic force line model.

Fig. 7

The magnetisation curve of 2Cr13.
The magnetisation curve of 2Cr13.

Fig. 8

The distribution of magnetic field lines when ordinary sealant is used to bond the split pole shoes.
The distribution of magnetic field lines when ordinary sealant is used to bond the split pole shoes.

Fig. 9

Distribution of B in the seal gap between pole shoes and shaft using ordinary sealant to bond split pole shoes.
Distribution of B in the seal gap between pole shoes and shaft using ordinary sealant to bond split pole shoes.

Fig. 10

The distribution of magnetic field lines using magnetic sealant to bond the split pole shoes.
The distribution of magnetic field lines using magnetic sealant to bond the split pole shoes.

Fig. 11

Distribution of B in the seal gap between split pole shoes and shaft in the case when magnetic sealant is used to bond the split pole shoes.
Distribution of B in the seal gap between split pole shoes and shaft in the case when magnetic sealant is used to bond the split pole shoes.

Fig. 12

The distribution of magnetic field lines of the split pole shoes for the optimised structure.
The distribution of magnetic field lines of the split pole shoes for the optimised structure.

Fig. 13

Distribution of B in the seal gap between split pole shoes and shaft for the split pole shoes with optimised structure.
Distribution of B in the seal gap between split pole shoes and shaft for the split pole shoes with optimised structure.

Fig. 14

The comparison of the simulation and theoretical results of pressure resistance for the pole shoes in different conditions.
The comparison of the simulation and theoretical results of pressure resistance for the pole shoes in different conditions.

The parameter table for calculating magnetic field intensity in the seal gap of split pole shoe structure.

Parameter Symbol Value Unit
PM coercivity Hc 930,000 A/m
PM remanence Br 1.28 T
PM length Lm 0.008 M
PM sectional length La 0.314 M
PM sectional height Lb 0.01 M
Pole shoe's initial teeth width Lt 0.0002 M
Pole shoe's initial groove width Ls 0.0008 M
Initial gap lg 0.0002 M
Saturation magnetisation of magnetic liquid Ms 400 G
Permeability of vacuum μ0 4π × 10−7 T·m/A
Relative magnetic permeability of pole shoes μj 100
Relative magnetic permeability of ordinary sealant μp 1
Relative magnetic permeability of magnetic sealant μd 4
Remark In theoretical calculation, 1/3 of groove width added with 1/2 of teeth width is taken as the upper limit of integral, and 1/2 of teeth width is taken as the lower limit.
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