通过对三叶外环流活塞泵工作原理的研究，得出了它的封液条件和不干涉条件，并给出了设计方法和有关公式。
The operating principle of three--vane external circulating current piston pump was studied and the conditions of liquid seal and non--interferrence of the pump were got.
针对外环流活塞泵运转时出现的汽蚀、震动问题，从理论上分析了转子型线与闭死容积、流速变化和发生汽蚀的内在关系；
To the problem of cavitation and shock that appears in the outside circulation piston pump running, the relation-ship between rotor profile and dead volume, flow rate and cavitation were analyzed.
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