力士乐叶片泵PVQ4-1X/098RA15UMC

力士乐叶片泵R900932961 PVQ4-1X/098RA15UMC

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叶片泵转子旋转时，叶片在离心力和压力油的作用下，尖部紧贴在定子内表面上。这样两个叶片与转子和定子内表面所构成的工作容积，先由小到大吸油后再由大到小排油，叶片旋转一周时，完成一次吸油与排油。

一、单作用叶片泵的工作原理

泵由转子1、定子2、叶片3、配油盘和端盖等部件所组成。定子的内表面是圆柱形孔。转子和定子之间存在着偏心。叶片在转子的槽内可灵活滑动，在转子转动时的离心力以及通入叶片根部压力油的作用下，叶片顶部贴紧在定子内表面上，于是两相邻叶片、配油盘、定子和转子间便形成了一个个密封的工作腔。当转子按逆时针方向旋转时，图右侧的叶片向外伸出，密封工作腔容积逐渐加大，产生真空，于是通过吸油口6和配油盘5上窗口将油吸入。而在图的左侧。叶片往里缩进，密封腔的容积逐渐缩小，密封腔中的油液经配油盘另一窗口和压油口1被压出而输出到系统中去。这种泵在转子转一转过程中，吸油压油各一次，故称单作用泵。转子受到径向液压不平衡作用力，故又称非平衡式泵，其轴承负载较大。改变定子和转子间的偏心量，便可改变泵的排量，故这种泵都是变量泵。

二、双作用叶片泵的工作原理

它的作用原理和单作用叶片泵相似，不同之处只在于定子表面是由两段长半径圆弧、两段短半径圆弧和四段过渡曲线八个部分组成，且定子和转子是同心的。在图示转子顺时针方向旋转的情况下，密封工作腔的容积在左上角和右下角处逐渐加大，为吸油区，在左下角和右上角处逐渐减小，为压油区；吸油区和压油区之间有一段封油区把它们隔开。这种泵的转子每转一转，每个密封工作腔完成吸油和压油动作各两次，所以称为双作用叶片泵。泵的两个吸油区和两个压油区是径向对称的，作用在转子上的液压力径向平衡，所以又称为平衡式叶片泵。

双作用叶片泵的瞬时流量是脉动的，当叶片数为4的倍数时脉动率小。为此，双作用叶片泵的叶片数一般都取12或16。

注意事项编辑

叶片泵的管理要点除需防干转和过载、防吸入空气和吸入真空度过大外，还应注意：

1．泵转向改变，则其吸排方向也改变叶片泵都有规定的转向，不允许反。因为转子叶槽有倾斜，叶片有倒角，叶片底部与排油腔通，配油盘上的节流槽和吸、排口是按既定转向设计。可逆转的叶片泵必须专门设计。2．叶片泵装配 配油盘与定子用定位销正确定位，叶片、转子、配油盘都不得装反，定子内表面吸入区部分较易磨损，必要时可将其翻转安装，以使原吸入区变为排出区而继续使用。3．拆装 注意工作表面清洁，工作时油液应很好过滤。4. 叶片在叶槽中的间隙太大会使漏泄增加，太小则叶片不能自由伸缩，会导致工作失常。5．叶片泵的轴向间隙 对ηv影响很大。1)小型泵-0.015～0.03mm2)中型泵-0.02～0.045mm6．油液的温度和粘度 一般不宜超过55℃，粘度要求在17～37mm2/s之间。粘度太大则吸油困难；粘度太小则漏泄严重。作为泵产品，叶片泵更多地指滑片泵。叶片泵几乎全部指滑片泵。

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