背靠背叶轮泵 pump with opposed impellers ; Back-to-back Impeller Pump
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背叶轮泵 back-to-back impeller pump
该类型泵特别适合于低比重介质的工况， 在这种情况下背对背的设计及中间衬套可以产生自然的轴向平衡和附加的轴支撑。
They are particularly suited to low specific gravity applications where the back-to-back design and center bush provide natural axial balance and additional shaft support.
结果表明，大尺寸的非金属夹杂和背帽外缘的点焊是引起泵轴过早断裂的主要原因。
The fracture of the pump shaft is mainly caused by large size non metallic inclusions and point welding between the lock nut and the pump shaft.
该型泵叶轮采用偶数设计方案，全部叶轮轴向成对称分布，背对背安装；
The impeller of the pump is designed to even number, and all impeller shafts are symmetrically distributed and installed back to back.
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