力士乐叶片泵PV7-1X/06-14RA01MA0-04
性能特点
叶片泵压力脉动小，因磨损而产生的工作压力下降车小运转平稳、噪音较小，结构紧凑，起动转矩小。但吸人条件较差，运动部件的工作可靠性较低。
1.流量较均匀，运转平稳，噪声较低。
2.双作用叶片泵转子所受径向力是平衡的，轴承寿命长;它的内部密封性也较好，容积效率较高;因此，一般额定排出压力较高，可达7MPa左右。
3.结构紧凑，尺寸较小而流量较大。
4.对工作条件要求较严。叶片抗冲击较差，较容易卡住，对油液的清洁程度和粘度都比较敏感。端面间隙或叶槽间隙不合适都会影响正常工作。转速一-般在500~2000r /道范围内，太低则叶片可能因离心力不够而不能压紧在定了表面，而太高则吸人时会产生“气穴现象”；
5.结构较复杂，零件制造精度要求较高。
内反馈限压式变量明片贷
原理:利用泵本身输出油对定子产生不平衡液压力的反馈作用来自动调节偏心距从而达到改变流量的目的。
限压式变量叶片泵适用于工作机构要求快速轻载和慢速重载要求的液压系统中。
快速轻载时，变量泵工作在曲线AB段，此时泵的压力小于限定压力，定子在流量调节螺钉.上，泵的流量大。
慢速重载时，变量泵工作在曲线BC段，此时泵的压力大于限定压力，泵的流量降低。
与定量泵相比优点:
减少功率损耗，降低油液温升。
叶片泵
双作泵工作原理:它由定子、转子、叶片和配油盘等组成。定子内壁近似椭圆形。叶片安装在转子径向槽内并可沿槽滑动,转子与定子同心安装。当转子转动时,叶片在离心力的作用下压向定子内表面，并随定子内表面曲线的变化而被迫在转子槽内往复滑动，相邻两叶片间的密封工作腔就发生增大和缩小的变化。叶片由小半径圆弧向大半径圆弧处滑移时,密封工作腔随之逐渐增大形成局部真空，于是油箱中油液通过配油盘上吸油腔吸入;反之将油压出。转子每转一-周 ，叶片在槽内往复滑移2次,完成2次吸油和2次压油,并且油压所产生的径向力是平衡的,故称双作用式,也称平衡式。
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