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Theoretical Analysis and Experimental Study on Breakaway Torque of Large-diameter Magnetic Liquid Seal at Low Temperature 被引量:2
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作者 ZHANG Haina LI Decai +1 位作者 WANG Qinglei ZHANG Zhili 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第4期695-700,共6页
The existing researches of the magnetic liquid rotation seal have been mainly oriented to the seal at normal temperature and the seal with the smaller shaft diameter less than 100 mm. However, the large-diameter magne... The existing researches of the magnetic liquid rotation seal have been mainly oriented to the seal at normal temperature and the seal with the smaller shaft diameter less than 100 mm. However, the large-diameter magnetic liquid rotation seal at low temperature has not been reported both in theory and in application up to now. A key factor restricting the application of the large-diameter magnetic liquid rotation seal at low temperature is the high breakaway torque. In this paper, the factors that influence the breakaway torque including the number of seal stages, the injected quantity of magnetic liquid and the standing time at normal temperature are studied. Two kinds of magnetic liquid with variable content of large particles are prepared first, and a seal feedthrough with 140 mm shaft diameter is used in the experiments. All experiments are carried out in a low temperature chamber with a temperature range from 200℃ to -100℃. Different numbers of seal stages are tested under the same condition to study the relation between the breakaway torque and the number of seal stages. Variable quantity of magnetic liquid is injected in the seal gap to get the relation curve of the breakaway torque and the injecting quantity of magnetic liquid. In the experiment for studying the relation between the breakaway torque and the standing time at the normal temperature, the seal feedtrough is laid at normal temperature for different period of time before it is put in the low temperature chamber. The experimental results show that the breakaway torque is proportional to the number of seal stages, the injected quantity of magnetic liquid and the standing time at the normal temperature. Meanwhile, the experimental results are analyzed and the torque formula of magnetic liquid rotation seal at low temperature is deduced from the Navier-Stokes equation on the base of the model of magnetic liquid rotation seal. The presented research can make wider application of the magnetic liquid seal in general. And the large-diameter magnetic 展开更多
关键词 magnetic liquid breakaway torque low temperature large-diameter
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自润滑关节轴承游隙调节工序中的无载阻力矩在线测试技术
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作者 刘红宇 《机械工程与技术》 2018年第3期200-205,共6页
滚轧游隙是自润滑关节轴承调节无载启动力矩的一种工艺手段。在建立滚轧中被轧轴承的摩擦力矩关于滚轧力的双线性模型的基础上,提出了通过连续检测滚轧加载过程或卸载过程中被测轴承的摩擦力矩和相应的滚轧力,进行无载启动力矩的在线检... 滚轧游隙是自润滑关节轴承调节无载启动力矩的一种工艺手段。在建立滚轧中被轧轴承的摩擦力矩关于滚轧力的双线性模型的基础上,提出了通过连续检测滚轧加载过程或卸载过程中被测轴承的摩擦力矩和相应的滚轧力,进行无载启动力矩的在线检测的方法。本文提出的方法有助于提高自润滑关节轴承滚轧游隙的精度。 展开更多
关键词 自润滑关节轴承 无载启动力矩 在线检测
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