力士乐油泵PV7-1A/16-30RE01MC0-08

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力士乐油泵PV7-1A/16-30RE01MC0-08

力士乐油泵PV7-1A/16-30RE01MC0-08，德国REXROTH叶片泵；
单作用叶片泵
单作用叶片泵的定义:叶片在离力和压力油的作用下，尖部紧贴在定子内表面上。通过改变两个叶片与转子和定子内表面所构成的工作容积大小变化，完成吸油排油过程，且叶片旋转一周，完成一次吸油与排油的叶片泵。
特点:
1.泵每转一转，每个密封腔吸油压油一次
2.转子上受液压不平衡力，为非平衡式泵
3.改变偏心距大小，可改变排量，为变量泵

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，右侧的叶片向外伸出，密封工作腔容积逐渐增大，产生真空，于是通过吸油口和配油盘上窗口将油吸入。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。

工作过程分析
单作用叶片泵的定子具有圆柱形内表面，定子和转子间有偏心距。若有Z个叶片，则定子圆周被分成Z部分。这里用r表示转子外圆半径，用R表示定子内表面半径。在垂直于转子轴的平面内，s1表示密封工作空间的小值(即叶片滑出的距离短)，它在半径方向的尺寸为[(R-e)-r]; S2表示密封工作空间的大值(即叶片滑出的距离长)，它在半径方向的尺寸为[(R+e)-r]。

利用等效法推导计算公式
从单作用叶片泵的工作过程可以看出，在离心力的作用下，叶片的一直与定子内壁接触，由于定子内表面半径为R，则其周长为2πR，而叶片的行程为2e,故在转子转动一周的过程中，任意相邻的两个叶片所围成的工作腔，在半径方向上的变化幅度都等于2e.在计算单作用叶片泵的排量时，可将其工作过程等效视为:叶片的先集中在长度为2πR 直线段上，然后同时沿着定子圆周的法线方向移动2e的距离。则密封容积几何尺寸的变化量可以等效长方体体积。

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R987066162 PV7-17/16-20RE01MC016+V7/10-14RE01MC016
R987046365 PV7-17/16-20RE01MC016+V7/16-20RE01MC16
R900592237 PV7-17/16-20RE01MC3-16
比例电磁铁的类型按照工作原理主要分为
如下几类:
(1)力控制型
这类电磁铁的行程短，只有1 5mm,输出力与输入电流成正比,常用在比例阀的先导控制级
上:
(2)行程控制型
由力控制型加负载弹簧共同组成，电磁铁输出的力通过弹簧转换成输出位移,输出位移与输入电流成正比，工作行程达3mm,线性好，可以用在直控式比例阀上;
(3)位置调节型
衔铁的位置由传感器检测后,发出一个阀内反馈信号,在阀内进行比较后重新调节衔铁的位置。阀内形成闭环控制,精度高,衔铁的位置与力
无关，精度高的比例阀如德国的博世意大利的阿托斯等都采用这种结构。
比例阀与放大器配套使用放大器采用电流负反馈,设置斜坡信号发生器阶跃函数发生器、PD调节器反向器等,控制升压降压时间或运动加速度及减速度。断电时, 能使阀芯处于安全位置。
比例电磁铁和液压阀组成电液比例阀。由于比例电磁铁可以在不同的电流下得到不同的力(或行程),因此可以无级改变压力、流量。故比例电磁铁是比例阀的关键元件。

(1)比例环节
比例环节也称为无惯性环节,对液压缸或马达，忽略液压油的可压缩性和泄漏,液压缸的流量Q= VA。其中V为活塞速度;A为活塞面积。其传递函数为: g(s)= V (s)/Q(s)= 1/A =式中K为比例环节放大系数或增益,表示输入量经过放大K倍后输出。
(2)比例控制系统
比例控制系统根据有无反馈分为开环控制和闭环控制。如比例阀控制液压缸或马达系统可以实现速度位移转速和转矩等的控制。
由于开环控制系统的精度比较低,无级调节系统输入量就可以无级调节系统输出量力速度以及加减速度等。这种控制系统的结构组成简单,系统的输出端和输入端不存在反馈回路,系统输出量对系统输入控制作用没有影响,没有自动纠正偏差的能力,其控制精度主要取决于关键元器件的特性和系统调整精度，所以只能应用在精度要求不高并且不存在内外干扰的场合。开环控制系统一.般不存在所谓稳定性问题。
闭环控制系统(即反馈控制系统)的优点是对内部和外部干扰不敏感，系统工作原理是反馈控制原理或按偏差调整原理。这种控制系统有通
过负反馈控制自动纠正偏差的能力。但反馈带来了系统的稳定性问题，只要系统稳定，闭环控制系统可以保持较高的精度。因此, 目前普遍采用闭环控制系统。

(1)根据用途和被控对象选择比例阀的类型;
(2)正确了解比例阀的动静态指标主要有额定输出流量、起始电流滞环重复精度额定压力损失温飘、响应特性频率特性等;
(3)根据执行器的工作精度要求选择比例阀的精度,内含反馈闭环阀的稳态性动态品质好。如果比例阀的固有特性如滞环非线性等无法使被控系统达到理想的效果时,可以使用软件程序改善系统的性能;
(4)如果选择带先导阀的比例阀，要注意先导阀对油液污染度的要求。-般应符合ISO 18/5标准,并在油路上加装过滤精度为10um以下的进油过滤器;
(5)比例阀的通径应按执行器在高速度时通过的流量来确定,通径选得过大，会使系统的分辨率降低:
(6)比例阀使用与之配套的放大器,阀与放大器的距离应尽可能地短。

电液比例阀是采用了比例控制技术,介于开关型液压阀和电液伺服阀之间的-种液压元件,在工业生产中获得了广泛的应用,输入的电信号有模拟式和数字式两大类,可以用于控制位置(转角)、速度(转速)、加速度(角加速度)、压力(压差)、力(力矩)等参数。电液比例阀等元件可以组成如下三类控制回路和系统
(1)电液比例压力控制回路和系统。例如:用于带钢热连轧机卷取机液压辅助系统的电液比例压力控制回路,用于板带轧机辊缝控制的液压推上系统电液比例压力控制回路,用于带材卷取设备恒张力的闭环电液比例压力控制回路;
(2)电液比例流量控制回路和系统。例如:用于带钢热连轧机精轧机平衡液压系统的电液比例压力控制回路,用于机床微进给的电液比例控制回路,用于旋压机折板机同步的电液比例控制回路,用于电梯的电液比例控制回路;
(3)电液比例多参数控制回路和系统。例如:用于带钢热连轧机精轧换辊液压系统的电液比例压力控制回路,用于液压缸垂直配置而采用wI型阀芯的比例控制回路,用于热轧钢卷步进链式运输机的速度、加减速度控制回路。