矿用高速抢险泵推力盘作辅助叶轮的试验

Experiment of thrust disk as auxiliary impeller in a high-speed rescue pump

为了获得矿用高速抢险泵中推力盘作辅助叶轮的水力特性,搭建了多功能推力盘试验台,通过试验方法研究了推力盘作辅助叶轮不同转速、温度、出口情况下的水力性能和抗汽蚀性能.试验结果表明:区别于传统离心泵,转速变化定律对推力盘作辅助叶轮产生的扬程不适用,转速越高,扬程系数取值越小.推力盘作辅助叶轮的流量范围与自身结构特性相关,与转速没有明显关系.6种转速下,随着流量增大,扬程不断降低,最大和最小扬程分别为19.64 m和2.62 m;机组效率先增大再减小,最高机组效率为6.5%;功率曲线则缓慢降低.随着转速提高,推力盘作辅助叶轮流量覆盖范围有轻微增大;相同流量点下,扬程和功率数值都有提高.抗汽蚀性能方面,不同转速下,温度对推力盘作辅助叶轮汽蚀性能影响不同;不同流量下,小流量工况下推力盘作辅助叶轮抗汽蚀性能优于大流量工况.

In order to obtain the hydraulic characteristics of thrust disk as auxiliary impeller in the mine high-speed rescue pump,a multi-function thrust disk experimental platform was built.The hydraulic and anti-cavitation performance of the thrust disk as auxiliary impeller at different speeds and temperatures were studied through the experimental method.The results show that different from the traditional centrifugal pump,the law of speed variation is not applicable to the head generated by the thrust disk as auxiliary impeller.The higher the speed is,the smaller the head coefficient is.The flow range of the thrust disk is related to its own structural characteristics.Under six different speeds,the head decreases as the flow velocity increases,and the maximum and minimum heads are 19.64 m and 2.62 m,respectively;the efficiency increases first and then decreases,the maximum unit efficiency is 6.5%;the power decreases slowly.With the increase of rotating speed,the flow range of the thrust disk as auxiliary impeller increases slightly,and the head and power values increase at the same flow point.In terms of anti-cavitation performance,the influence of temperature on the cavitation perfor-mance is different at different speeds;while the anti-cavitation performance of the thrust disk as auxi-liary impeller under small flow condition is better than that under large flow condition.