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日本Rigaku公司已经研制了一种新型的回转轴磁封装置。在回转轴的园柱表面上敷上磁性液体,因为在回转轴的支承零件上有若干个环形磁铁且形成NS—SN—NS的磁场排列,因而就吸引了回转轴上的磁性液体而产生一种气体的密封屏障,这样就能阻止气态物质的泄漏。由于该种磁封装置较油封,橡皮密封和其它机械密封方法可靠得多,因而已开始应用于半导体,粮食加工,核动力装置以及医药等工业部门中需要极其可靠密封的场合中。该装置与美国制造的同素型磁封装置相比有下列优点: 1.能经得住大大高于2.5kg/cm~2的不均
Japan Rigaku company has developed a new type of rotary shaft magnetic sealing device. Magnetic fluid is applied to the surface of the cylindrical surface of the rotary shaft because a magnetic field of the NS-SN-NS is formed on the support member of the rotary shaft by a number of ring magnets, thereby attracting the magnetic fluid on the rotary shaft to produce a Gas seal barrier, which will prevent the leakage of gaseous substances. Because of their much greater reliability than oil seals, rubber seals, and other mechanical sealing methods, these magnetic sealing devices have been used in applications requiring extremely reliable sealing in the semiconductor, food processing, nuclear power plant, and pharmaceutical industries. The device has the following advantages compared with the same type of magnetic sealing device made in the USA: 1. Can withstand the unevenness greatly higher than 2.5kg / cm ~ 2