基于介电常数法的润滑油水含量测量装置设计

Design of measuring device for lubricating oil water content based on dielectric constant method

针对润滑油过高含水量会影响动力机械正常工作的问题,设计一种基于介电常数测量的双管式电容传感器及配套的检测系统。该传感器采用双管式设计,内管设计成表面均匀分布圆孔的空心圆筒,使润滑油能更快流通从而提高含水量在线测量的响应速度和准确度。通过Maxwell软件对传感器进行仿真求解,与不同含水量下的测量值进行对比实验,另外进行高温下的测试。实验结果表明:该套设备发现理论值和实验值误差小于5%,在恶劣的高温条件下依旧具有充足的重复性与稳定性,能够有效检测润滑油含水量,具有良好的使用价值。

Aiming at the problem that excessive water content of lubricating oil will affect the normal work of power machinery,a double-tube capacitive sensor based on the measurement of dielectric constant and a detection system are designed.The sensor adopts a double-tube design,and the inner tube is designed as a hollow cylinder with circular holes evenly distributed on the surface,so that the lubricating oil can flow more quickly,the response speed and accuracy of online measurement of water content can be improved.Maxwell software was used to simulate and solve the sensor,and the experiment was compared with the measured values under different water content.In addition,the test was carried out under high temperature.The experimental results show that the error between the theoretical value and the experimental value is less than 5%,and the equipment still has sufficient repeatability and stability under severe high temperature conditions,and can effectively detect the water content of lubricating oil,so it has good use value.