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双联叶片泵　　
单作用：叶片是镶嵌在槽里的，可以自由滑动，当旋转产生时，叶片在离心作用下甩到泵壳上，叶片泵是容积泵，相邻的两个叶片运动到下边时与泵壳和转子封闭的容积zui小，在上边时zui大，当转子顺时针转动时，相邻两叶片经历从zui下边到zui上边的过程就是容积增大过程，所以吸油（从第四象限到第二象限）；从zui上到zui下是容积减小过程，所以压油（从第二到第四象限）。 　　双作用：当电机带动转子沿转动时，叶片在离心力和叶片泵