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Calculation of magnetic fluid sealing pressure and Experimental Research


Under the formula by the minimum magnetic field strength groove H-0 +24 H ... According to the magnetic circuit Theorem: A one K1 (BA +0.24 BA) (3) they know that: B A 3500G, A a (r2. A r1) A 675, AF a 2r. × 4-48.64, A a 2 × 3-148.8. Generation type (3) obtained: B a 1400G. Of course, this value is an approximation of the resultant seal pressure is also similar. For the permanent magnet flux density, magnetic induction due to measurement value is No. 4 27 9 Fluid mechanical strength of the highest point value, so taking = 2800G. According to the formula (1), when = 400G, it may be a single-stage sealing pressure △ P ... a 0.024MPa, so a 0,192 MPa △ P can be estimated using the same method the maximum sealing pressure of the device, apparently = 600G; seal clearance a 0.025mm, the permanent magnet when the magnetic induction sealing pressure for a 3500G largest, ie the maximum seal pressure is 0.608MPa3.2 experimental results and different terms of 3.2.1 when the magnetic seal gap, the magnetic field in the source of magnetic fluid seal Performance of experimental conditions: the pole shape and other dimensions shown in Figure 3, the gap g 0, respectively. i00, 0.50,0.025 mm. By changing the combination of permanent magnets to change the magnetic flux density magnetic source the source of magnetic induction, respectively 800,2400,2800,2500 G; magnetic fluid as the HS type (saturation magnetization of 400G); sealing medium is ammonia; a temperature f 25C; speed 2000r/rain; holding time for the 24h experimental results are shown in Table 1,[link widoczny dla zalogowanych], Table l the magnetic induction sealing pressure and the relationship between BG) 8oo a 0.100ram04 『than 40C280C35oig o. 91.01.2g = 0.05Omm1 ·. j1 · 92.02.5 (× 1oMPa) g = 0.025mm1 · 52.12 .527 Table 1 shows that, with the magnetic flux density increases,[link widoczny dla zalogowanych], the magnetic fluid sealing pressure corresponding increase in its rate of increase with the magnetic source The increase of magnetic induction to flatten 3.2.2 saturation magnetization of magnetic fluid sealing ability of the magnetic fluid in magnetic fluid seal plays a very important role, so magnetic fluid sealing ability of a significant effects,[link widoczny dla zalogowanych], in order to study this effect, taking 3 of the magnetic fluid as the research object, do the following comparative experiments when stationary seal gap 0.050,0.025 mm, magnetic field strength to take a different experiment, the results shown in Table 2 , 3 shown in Table 2,3 shows the different magnetic fluid sealing pressure to obtain different magnetic fluid with saturation magnetization increases,[link widoczny dla zalogowanych], the magnetic fluid sealing pressure corresponding increase in the magnetic fluid itself,[link widoczny dla zalogowanych], thus improving the performance but also improve the magnetic pressure of the fluid sealing an important way to Table 2 the saturation magnetization and magnetic fluid seal between the pressure (g - o05mm) magnetic fluid saturation magnetization (G) l400l480600 three :::}::。 maximum sealing pressure l':::::: l Queen III: only! Table 3 and the saturation magnetization of magnetic fluid seal between the pressure (a 0025ram) magnetic fluid saturation magnetization (G) 40048060CB a 3500G27323. B-E the maximum sealing pressure 2800G2.53.03.7 (× 10'MPa) B a 2400G212.53. i4 Conclusion (1) with the magnetic fluid seal capacity of the magnetic field in the magnetic source increased with the increase, but reaches a certain value, the increase rate tends to slow; (2) the magnetic fluid as the magnetic fluid seal capacity increase of saturation magnetization improved; (3) the method to calculate the magnetic Theorem magnetic fluid sealing pressure with the experimental results there are some differences, but considering the design safety margin is still valuable. References 1 Zouji Bin. The development of magnetic fluid seal and the status quo. Tribology. 1994; (7): 28O ~ 2852 Evergreen pool. Ferromagnetic fluid. Published by Beijing University of Aeronautics Du. 19933 Fangxian Qing. Bearing capacity of magnetic fluid seals calculations. Lubrication Engineering, 1995 {(6): 6 ~ 124 Music Zhicheng. Profile of the magnetic fluid seal of Mechanical Engineering, 1990; (12): 6O ~ 625 Jimmy Wong finite element method such as magnetic fluid seal gap magnetic field. Huazhong University of Technology t1991; (: 5 ~ 616 Bureau of Sai. Magnetic measurements. Electronics Industry Press, 1987g Li-ping Mei Long Road, Shanghai 200237, China East China University of machines

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