改型环形灌注泵的径向力研究

Study on Radial Force of a Modified Centrifugal Charging Pump

为解决灌注泵的泄漏问题 ,对灌注泵的 3个特征及轴封泄漏量的解析式进行了分析 .认为轴封间隙过大是导致灌注泵泄漏的主要原因 ,而轴封间隙是由作用在叶轮上的径向力引起的 .普通离心泵径向力及轴封间隙过大因而不适合用作灌注泵 .设计出一种改型环形离心泵 ,其压水室由一段环形流道和一段螺旋形流道组成 .对环形压水室、螺旋形压水室及环形 -螺旋形压水室泵径向力的定性分析表明 :这种改型环形灌注泵的径向力小 ,且最小径向力点向小流量方向偏移 ,正好满足灌注泵小流量下小径向力的要求 .对这种改型环形泵的径向力进行了测试 ,并将结果与相同比转速下涡形泵和环形泵径向力的计算值进行了比较 。

In order to reduce the leakage of an ordinary centrifugal pump used as the charging pump of a triplex drilling pump, the characteristics of the pump and the analytic formula of the leakage are analyzed, and it is held that the leakage is mainly caused by the clearance of the bearing seal of the pump, and the clearance is caused by the radial force acting on the turbine wheel of the pump. The analyses show that the radial force and the clearance of the ordinary centrifugal pump are too great, so it is not suitable to using as the charging pump. The authors designed a modified centrifugal pump, and its water pressurizing room is composed of two sections: circular section and spiral section. The radial forces of the centrifugal pumps with circular, spiral and circular spiral pressurizing water rooms separately are qualitatively analyzed, and it is shown that the radial force of the modified pump with circular spiral pressurizing water room is little, and the minimum radial force appears under little flow rate. This characteristic of the pump meets just the right requirement of a charging pump. The radial force of the pump is measured, and the measured data are compared with the calculated results of a circular pump and a volutex pump under the same specific speed. The same conclusion as the qualitative analysis above is drawn out.