论文部分内容阅读
本文介绍了一种螺旋桨阴极保护用新型低电阻轴接地装置。它的滑环为铜-银复合结构,设计成两个半圆环;电刷选用银-石墨材料,能够调节和保持接触压力;支架可以使电刷在高度、轴向和径向三方向调整,保证电刷均匀地正压在滑环表面上。试验测得每个电刷的接触电阻:静态为17mΩ,动态(720rmp)为3.8mΩ。运转600小时后,接触电阻有所增加,静态增加一倍,动态增加两倍。电刷磨损速度平均为0.009mm/h。实船使用测量表明,安装该装置后可以使螺旋桨与船体的电位差由210mv降至13mv,基本处于短路状态,因此,只要船体处于良好保护状态,螺旋桨便可达到完全保护。
This paper presents a new type of low resistance shaft grounding device for propeller cathodic protection. Its slip ring is a copper-silver composite structure, designed as two semi-circular rings; brushed silver-graphite material is used to adjust and maintain contact pressure; brackets allow the brushes to be adjusted in three directions of height, axial and radial , To ensure that the brush evenly positive pressure on the slip ring surface. The test measured the contact resistance of each brush: static 17mΩ, dynamic (720rmp) of 3.8mΩ. After 600 hours of operation, the contact resistance has increased, the static doubled, the dynamic doubled. Brush wear rate average of 0.009mm / h. The measurements of actual ship use show that the installation of the device can reduce the potential difference between the propeller and the hull from 210mv to 13mv and is basically in a short-circuited state, so that the propeller can achieve complete protection as long as the hull is in good protection.