立式屏蔽泵的轴向力及石墨轴承耐磨性试验研究

Experimental research on axial thrust and the wearability of graphite bearing of a vertical canned motor pump

对影响立式屏蔽泵使用寿命的两个关键问题——泵的轴向力和石墨轴承的耐磨性进行了研究。建立了轴向力测量装置,研究屏蔽泵的密封环结构形式和运行工况对轴向力的影响关系,发现双端面密封和平衡孔配合使用可以有效减少轴向力;在Falex摩擦磨损机上对普通石墨材料和浸润树脂石墨材料进行了磨损实验,并利用CSM950扫描电子显微镜对其磨损表面作了形貌分析,试验表明,浸润树脂石墨材料的耐磨性能明显高于普通石墨材料。以上的研究结果对屏蔽泵的设计有指导作用。

This research dealt with the axial thrust and the wearability of graphite bearing of a vertical canned motor pump, which are the two critical problems about the pump's working life. A measuring apparatus was established to find out the influence of the structure of seal ring and the operating point of the pump on the axial thrust, and these tests indicate that if double mechanical end face seal and balance holes are used, axial thrust will be greatly reduced. A series of abrasive experiments on the common graphite material and the infiltration epoxide resin graphite material were made by using Falex tribology test equipment, and CSM950, a scanning electron microscope(SEM) equipment, was used to analyze the fracture morphology on their surface. It is found out that the wearability of the infiltration epoxide resin graphite material is better than that of the common graphite material. These experimental results provide some references for the design of canned motor pumps.