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是一种常用的液压油泵，具有噪声低、工作效率高、造价相对较低等优点。散热型变量叶片泵是一种典型变量叶片泵，比普通的叶片泵具有更多的优点，散热性好好，高温环境下使用更利于降低变量叶片泵中的热量，保护变量叶片泵和电机不被高温给烧坏力士乐Rexroth PV7系列 变量叶片泵 变量叶片泵的定子内表面是一个圆形，转子与定子间有偏心距，在配油盘上只开有一个吸油窗口和一个压油窗口。当转子在电动机驱动下按图示箭头方向旋转时，叶片经定子下半部时，在离心力的作用下，从叶片槽中伸出，两叶片间的密封容积增大，实现吸油；叶片经定子上半部时，被定子内表面逐渐压入叶片槽内，密封容积减少，实现压油。泵的转子每转一转，每个密封容积吸、压油各一次。改变定子和转子间的偏心量，便可改变泵的排量，故称为变量叶片泵，1.为了使叶片泵可靠地吸油，其转速必须在500～1500r/min的范围，转速太低时，叶片不能紧压定子的内表面和吸油；转速太高则造成泵的“吸空”现象，泵的工作不正常。油的粘度要选用适当，粘度太大，吸油阻力增大；油液过稀，间隙影响，真空度不够，会对吸油造成不良影响。
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