Abstract
In order to solve the leakage problem of rotating machinery under the condition of large clearance, a new type of divergent magnetic fluid sealing device with secondary magnetic source was designed. The magnetic field distribution in the clearance of the magnetic fluid seal was simulated by the finite element method of magnetic field, and the theoretical value of the sealing pressure resistance was calculated according to the pressure resistance theory of the divergent magnetic fluid seal. The influences of the volume of magnetic fluid injection, the number of teeth, the clearance, and the eccentricity of the rotating shaft on the pressure resistance abilities of divergent magnetic fluid seal were studied by experimental method and compared with the pressure resistance experimental value of ordinary magnetic fluid seal. The results showed that when the injection volume of magnetic fluid is more than 3 ml, the sealing pressure resistance ability of the magnetic fluid does increase greatly and tends to be stable gradually. The saturated magnetic fluid injection volume of divergent magnetic fluid seal with large clearance is 3 ml. With the increase of radial teeth, the pressure resistance ability of magnetic fluid seal first increases and then decreases. With the increase of axial teeth, the pressure resistance ability of magnetic fluid seal also increases. With the increase of radial clearance, the pressure resistance value of magnetic fluid seal first increases and then decreases. With the increase of axial clearance, the pressure resistance value of magnetic fluid seal decreases. The pressure resistance ability of divergent magnetic fluid seal is significantly higher than that of ordinary magnetic fluid seal.
Highlights
Magnetic fluid seal plays a vital role in engineering because they have the advantages of simple structure, high reliability, and long service life [1,2,3]
In the field of magnetic fluid seal, the clearance that is less than or equal to 0.3 mm is small clearance, and the clearance which is larger than 0.3 mm is called large clearance. e magnetic fluid seal has high reliability under the condition of small clearance, but the larger seal clearance [4, 5] will reduce the pressure resistance ability of magnetic fluid seal, so how to improve the pressure resistance ability of magnetic fluid seal under large clearance is a difficult problem at the moment
Zhao et al carried out numerical analysis on the magnetic fluid seal with small clearance [6] and found that when the material and structure are the same, the magnetic fluid sealing ability decreases with the increase of the sealing clearance
Summary
Magnetic fluid seal plays a vital role in engineering because they have the advantages of simple structure, high reliability, and long service life [1,2,3]. E magnetic fluid seal has high reliability under the condition of small clearance, but the larger seal clearance [4, 5] will reduce the pressure resistance ability of magnetic fluid seal, so how to improve the pressure resistance ability of magnetic fluid seal under large clearance is a difficult problem at the moment. Szczech carried out an experimental study on the pressure distribution mechanism between stages of the magnetic fluid seal [7]. E abovementioned people mainly studied the magnetic fluid seal with small clearance. In order to improve the pressure resistance ability, Yang et al compared the pressure resistance ability of stepped magnetic fluid seal with large clearance and ordinary magnetic fluid seal and numerically and experimentally studied the influences of sealing clearance and leakage path on the pressure
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
