混流式喷水推进泵叶轮刮擦故障诊断方法

Fault Diagnosis Method of Impeller Scratching in Mixed Flow Water Jet

针对喷水推进泵的叶顶间隙过大或者过小都会影响喷水推进船航速的问题,提出一种利用泵壳体振动和输入轴力矩参量对叶轮刮擦故障进行识别的方法。在介绍混流式喷水推进泵叶轮径向摩擦振动机理的基础上,对装有2台喷泵的某高速巡逻艇的实船试航,通过获取的靠近叶轮的壳体振动信号以及输入轴力矩信号分析,得到了具体的故障特征指标。该分析结果为使用人员及时对这类异常状态做出快速、准确的判断,及时调整叶轮安装的状态以防止更大事故的发生提供了参考。

For water jet pump tip clearance is too large or too small will affect the problem of the speed of the water jet propulsion boat, the impeller scratch fault identification method is put forward by vibration of the pump shell and shaft torque. Based on pump impeller radial vibration mechanism of friction, a real high-speed patrol boat which is equipped with two pumps is tested for trials, according to the impeller casing vibration signal and the input shaft torque signal analysis, the fault indicators of the specific characteristics are received. The analysis result can be make quickly, accurate judgments for the abnormal state, and also can provide the reference for prevent a greater accident by adjusting the impeller installed state.