在小化肥厂生产尿素系统中,常以二台3BA-9铝镁合金泵串联或用塑料泵输送碳酸氢铵母液,这两种泵的寿命均较短。经常一、二个月就停机维修,更换零件。经常损坏零件有叶轮螺母止退垫圈,因为它很薄只有1毫米厚,材料是A3的。很快腐蚀掉,因此叶轮运转中在轴向力作用下游动。同时也经常腐蚀坏键和轴。为了提高泵的耐腐蚀寿命,我们在3BA-9型铝镁合金泵的基础上,重新设计和试制了3BH-5型铝镁合金耐腐蚀泵(性能参数见表1),采取了下列措施 In a small fertilizer plant urea system, often with two sets of 3BA-9 aluminum-magnesium alloy pump or in series with plastic pump ammonium bicarbonate mother liquor, both pumps have a shorter life expectancy. Often one or two months downtime maintenance, replacement parts. Often damaged parts have impeller nut washers, because it is only 1mm thin and the material is A3. Quickly corroded, so impeller operation in the axial force under the action. Corrosion keys and shafts are also often corroded at the same time. In order to improve the corrosion-resistant pump life, we based on the 3BA-9-type aluminum-magnesium alloy pump, redesigned and trial-produced 3BH-5-type magnesium alloy corrosion resistant pump (performance parameters in Table 1), to take the following measures