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.
一种带油污洗涤装置的抽油烟机，由罩壳、电机、叶轮、洗涤循环泵、集油槽、集液容器和进风口封盖组成。
A smoke extractor with an oil-stain cleaning device consists of a shell, a motor, an impeller, a cleaning circulation pump, an oil sump, a liquor-collecting container and an air inlet cap.
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