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介绍可输送含颗粒介质的工程塑料液下泵的新型结构设计，着重论述液下深度２～３ｍ的液下泵导轴承、背叶片等结构及压力继电器的采用。
This paper introduces the new structure design of submerged pump of engineering plastic which can transport pellet - containing medium. Emphatically discusses the structure of submerged pump guide bearing and back vane under pressure of 2 ~ 3m and the adoption of pressure relay.