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讨论了回转式容积泵内动密封间隙的一般确定方法和泵可靠吸入的保障条件，给出了最佳间隙和泵转速的导出途径，提出了回转式容积泵汽蚀余量的引出方式。
The general method of determining the dynamic seal clearance in the rotary displacement pump and the safeguarded condition of reliable suction of the pump are discussed. The optimal clearance and the derivation of the pump speed are given. The way of withdrawing the NPSH of the rotary displacement pump is proposed.