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The magnetic fluid and magnetic grease combination rotary Sealing structure device have been designed, and the experimental station and process of this structure was discussed. The results shows that,when the sealing gap were 0.3mm, 0.4mm, 0.5mm and 0.6mm respectively, the pressure capacity was mainly related with the sealing stage, magnetic field strength, magnetic fluid saturation magnetization and yield stress of magnetic grease. ( . So it is gradually turned to study the magnetic fluid sealing which is a new sealing method, it is very important to study the large gap under the magnetic fluid sealing technology. The pressure performance,the leakage rate of magnetic fluid sealing and the life of the sealing structure are very important performance indicators ) 5 ( .This paper presents a magnetic fluid and magnetic grease combination rotary sealing structure, the gap can be adjusted from 0.3mm to 0.7mm, it was also tested the pressure capacity and the leakage rate under the corresponding sealing gap. The results showed that the design of the combination sealing structure is not only can solve the large gap problems, but also improved the sealing pressure capability.

Experimental Study of Magnetic Fluid and Magnetic grease combination rotary Sealing