Experimental investigation of diverging stepped magnetic fluid seals with large sealing gap

2016 ◽  
Vol 50 (3) ◽  
pp. 407-415 ◽  
Author(s):  
Xiao Long Yang ◽  
De Cai Li
Keyword(s):  
Experimental Investigation ◽  
Magnetic Fluid ◽  
Sealing Gap

The Comparison of Magnetic Leakage of Different Teeth Structures in Magnetic Fluid Seal

2011 ◽  
Vol 197-198 ◽  
pp. 314-317 ◽  
Author(s):  
Fei Fei Xing ◽  
De Cai Li ◽  
Wen Ming Yang ◽  
Xiao Long Yang
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Model ◽  
Field Distribution ◽  
Magnetic Fluid ◽  
Magnetic Field Distribution ◽  
Two Sides ◽  
The Magnetic Field ◽  
Sealing Gap

Based on the theoretical model, magnetic field distribution of rectangular teeth, two-sides dilated shape and one-side dilated shape teeth structure with common other conditions were calculated using finite element method when the sealing gap was 0.1mm and 0.12mm. The comparison of their results with the same sealing gap showed that rectangular teeth structure had the highest magnetic leakage. Moreover, the magnetic field distribution of sealing structures with rectangular stages on both the shaft and pole pieces under the same design and sealing gap were also calculated using the same method, whose result was compared with rectangular stages on pole pieces only. The comparison showed that the former did not have higher pressure capability obviously but led to higher magnetic leakage.

Experimental investigation of nearly monodispersed ternary Mn0.5Zn0.5Fe2O4 magnetic fluid

2008 ◽  
Vol 44 (1) ◽  
pp. 19-26
Author(s):  
K. Parekh ◽  
R.V. Upadhyay ◽  
R.V. Mehta ◽  
V.K. Aswal
Keyword(s):  
Experimental Investigation ◽  
Magnetic Fluid

Numerical analysis and experimental verification of magnetic fluid sealing for air cylinder in Aerospace Engineering

2021 ◽  
pp. 1-17
Author(s):  
Chen Fan ◽  
Zhang Chongfeng ◽  
Yang Xiaolong
Keyword(s):  
Magnetic Field ◽  
Numerical Analysis ◽  
Service Life ◽  
Permanent Magnet ◽  
Magnetic Fluid ◽  
Slot Width ◽  
Aerospace Engineering ◽  
Pole Piece ◽  
The Magnetic Field ◽  
Sealing Gap

In order to solve the problem of short service life (2 months) and zero leakage of air cylinder in aerospace engineering, this paper innovatively designs a magnetic fluid sealing device of air cylinder in aerospace engineering through magnetic circuit analysis and magnetic fluid sealing theory. The magnetic field finite element method is used to calculate the magnetic field distribution in the sealing gap under different key parameters such as the number of pole teeth, the height of the radial sealing gap, the thickness of the permanent magnet, the slot width, the ratio of pole piece height to shaft. And numerical analysis of the number of pole teeth, the radial sealing gap height, permanent magnet thickness, slot width, the ratio of pole piece height to shaft and other key parameters on the magnetic fluid sealing performance. Finally, the reliability of the reciprocating magnetic fluid sealing withstand voltage is verified by experimental methods. Research indicates. The pressure capabilities of magnetic fluid sealing is increasing with the increase of the number of pole teeth. The pressure capabilities of magnetic fluid sealing is decreasing with the increase of the radial sealing gap. The sealing withstand voltage increases first and then decreases with the increase of the thickness of the permanent magnet, and finally increases, and the value of the withstand voltage is the largest when the thickness of the permanent magnet is 7.8 mm. The sealing pressure capabilities increases as the slot width increases. The sealing withstand voltage increases first and then decreases as the ratio of pole piece height to shaft increases, and when the ratio of pole piece height to shaft is 0.8, the sealing withstand voltage reaches a maximum value. The pressure test finally reaches the pressure value of 6 MPa, which can meet the pressure value demand of medium pressure cylinder, indicating that the magnetic fluid sealing technology can effectively solve the leakage problem existing in the air cylinder technology of Aerospace Engineering, and improve the reliability and service life of the air cylinder.

scholarly journals New Designs of Magnetic Fluid Seals for Reciprocating Motion

2021 ◽  
Vol 28 (4) ◽  
pp. 151-159
Author(s):  
Leszek Matuszewski ◽  
Piotr Bela
Keyword(s):  
Magnetic Fluid ◽  
Operating Conditions ◽  
Linear Motion ◽  
Practical Application ◽  
Reciprocating Motion ◽  
Seal Failure ◽  
Hydraulic Cylinders ◽  
Sealing Mechanism ◽  
Carry Over ◽  
Sealing Gap

Abstract The operating conditions of magnetic fluid seals during reciprocating motion are so different from those observed in rotating motion that the use of their conventional structures for reciprocating motion seals yields no good results. The analysis of the sealing mechanism of magnetic fluid seals in reciprocating motion shows that the operation of these seals is affected by the carry-over phenomenon and magnetic fluid film deformation in the sealing gap, which depends on the velocity of the reciprocating motion. The reduced amount of magnetic fluid in the sealing gap caused by the reciprocating motion of the shaft is the main reason for seal failures. The paper presents a short characterisation of magnetic fluid sealing technology, the principle of sealing, the operation of the magnetic fluid and the seal failure mechanism in linear motion of the shaft. Moreover, some new structural designs of hybrid seals, being combinations of typical hydraulic seals with magnetic fluid seals for reciprocating motion, and some examples of magnetic fluid sealing structures for hydraulic cylinders and piston compressors which have practical application values are presented.

Experimental investigation on plasma jet deflection with magnetic fluid control based on PIV measurement

2018 ◽  
Vol 21 (2) ◽  
pp. 025503 ◽  
Author(s):  
Kai ZHAO ◽  
Baigang SUN ◽  
Yongji LU ◽  
Feng LI ◽  
Yongbo LIU ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Magnetic Fluid ◽  
Plasma Jet ◽  
Piv Measurement ◽  
Fluid Control

Experimental Study of Large Gap Magnetic Fluid Static Sealing

2011 ◽  
Vol 492 ◽  
pp. 283-286 ◽  
Author(s):  
Fei Fei Xing ◽  
De Cai Li ◽  
Xiao Long Yang
Keyword(s):  
Experimental Study ◽  
Magnetic Fluid ◽  
Leak Rate ◽  
Experimental Station ◽  
Sealing Gap ◽  
Gap Structure

A large gap structure device of the magnetic fluid static sealing have been designed, and this structure was made to test the anti-pressure, the experimental station and process was discussed, the factors that affect the experiment result were also been analyzed. The pressure capacity and the size of the leak rate have been measured when the sealing gap were 0.4mm, 0.5mm, 0.6mm and 0.7mm respectively. Experiments show that the design of the sealing structure can solve the problem of large gaps in the magnetic sealing, and for the gap of 0.4mm, its anti-pressure capacity is 70 percent more than the pressure of the typical sealing gap (0.15mm).

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