天蝶阀门电动执行器针对阀门的预测维护
electric actuator predictive maintenance of valves
操作人员可以借助电动执行器内置的数据存储器来记录阀门每次动作时力矩感应装置测得的数据，这些数据可以用来监测阀门运行的状态，可以提示阀门是否需要维修，也可以用这些数据来诊断阀门。
The operating personnel can use the built-in data memory of the electric actuator to record the data measured by the torque sensor at each action of the valve. These data can be used to monitor the state of valve operation and can indicate whether the valve needs to be repaired, and also can use these data to diagnose valves.
针对阀门电动执行器可以诊断如下数据:
The following data can be diagnosed for the valve of the electric actuator:
1.阀门密封或填料摩擦力
1.Valve seal or filler friction
2.阀杆、阀门轴承的摩擦力矩
2.Friction torque of valve stem and valve bearing
3.阀座摩擦力
3.Seat friction force
4.阀门运行中的摩擦力
4.Friction force in operation of valve
5.阀芯的所受的动态力
5.The dynamic force of the valve core
6.阀杆螺纹摩擦力
6.Friction force of stem thread
7.阀杆位置
7.Valve stem position
上述大部分数据存在于所有种类的阀门，但着重点不同，例如:对于蝶阀，阀门运行中的摩擦力是可以忽略的，但对于旋塞阀这个力数值却很大。不同的阀门具有不同的力矩运行曲线，例如:对于楔式闸饭，开启和关闭力矩都非常大，其它行程时只有填料摩擦力和螺纹摩擦力，关闭时，液体静压力作用在闸板上增加了阀座摩擦力，终楔紧效应使力矩迅速增大直到关闭到位。所以根据力矩曲线的变化可以预测出将会发生的故障，可以对预测性维护提供有价值的信息。
Most of the above data exist in all types of valves, but the focus is different. Such as butterfly valves, the friction in the operation of the valve is negligible, but the force value of the plug valve is very large. Different valves have different torque running curves. For example, wedge-type flashboard, the opening and closing moments are very large. In other strokes, there are only filler friction and thread friction. When closed, the static pressure of the liquid increases the seat friction on the gate, and the final wedge effect causes the torque to increase rapidly until it is closed. Therefore, according to the change of the torque curve can predict the faults that will occur, and can provide valuable information for predictive maintenance.
