Study on the seal of tank panoramic sight with magnetic fluid

Because tank panoramic sight works in a harsh condition and its seal requires long life, high reliability, low friction and smooth operation, the seal of tank panoramic sight is a difficult problem. In order to solve this problem, the authors used magnetic fluid seal and designed the seal structure of tank panoramic sight. The authors theoretically calculated the magnetic filed distribution and the sustained pressure of the designed seal structure. The authors carried out the high-low temperature test, wet-hot test, saltfog test, and sustained pressure test for the designed structure. The experimental results indicated that the designed structure is correct and meet the practical requirement. The reliability of magnetic fluid seal of tank panoramic sight has been verified in practice.