摘要
针对牛顿型磁性流体密封的密封间隙较小、适用温度较低的不足,提出了对磁性流体载液的改进。采用高黏度非牛顿润滑脂作为磁性流体的载液,制备成以Fe3O4为磁性颗粒的磁性润滑脂。在试验台上实际测定了该磁性润滑脂用于密封时在不同工况和不同密封结构下的密封压力、密封处的温度,并对影响密封压力和密封处温度的主要原因进行了分析。结果表明,高黏度非牛顿磁性润滑脂密封比牛顿型磁性流体密封的承压能力更高,温度适用范围更广,密封间隙可以大大提高,并允许旋转轴存在一定量的径向跳动;通过调节内摩擦影响因素,可以降低密封处温度,延长使用寿命。
For the universal Newtonian magnetic fluid seal can only seal a very small gap and only be used for the low temperature occasions, a kind of magnetic grease with Fe3O4 magnetic particles was prepared by replacing the Newtonian fluid with high viscosity grease. The sealing capacity of the magnetic grease used as seal fluid was measured on the experimental device under different conditions and structures, the changing tendency of the sealing pressure and the temperature of the magnetic grease was studied. The results indicate the non-Newtionian magnetic grease can bear high seal pressure and can be used in high temperature occasions, the seal gap can be larger so that the radial runout can be improved. The regulation of the inner friction factors can decrease the sealing temperature, so the life of the non-Newtonian magnetic grease seal can be much longer.
出处
《润滑与密封》
CAS
CSCD
北大核心
2010年第4期90-93,共4页
Lubrication Engineering
