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.
如果面对面或背对背配置的相配圆锥滚子轴承对与第三个轴承安装在一起，轴承配置为静态不确定。
If matched pairs of tapered roller bearings arranged face-to-face or back-to-back are mounted together with a third bearing, the bearing arrangement is statically indeterminate.
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