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液压放大器是指以压力油作为传动介质,通过对输入端的小功率的控制信号的调节实现对输出端大功率液压功率进行控制的功率放大装置。
三端口元件:输入端,能源,输出端
放大的特征:
用小功率的输入信号控制大功率的液压功率输出
输出端的功率来自能源,输出端液压功率的大小受输入信号控制
放大器的效率等于放大器的输出功率与能源输送给放大器功率的比值。
分类:节流式液压放大元件(阀控式)
容积式液压放大元件(排量控制式)
阀控式:滑阀式,喷嘴挡板式,射流管式
容积式:变量泵,变量马达
液压控制阀,在阀控式放大器中,直接对执行元件的力和速度进行控制;在容积式放大元件中,它直接控制着变量机构,通过控制排量的方法间接控制执行元件的力和速度。
液压控制阀是基本、重要的液压放大器。
阀对流量的控制可以分为两种:
一种是开关控制:要么全开、要么全关,流量要么大、要么小,没有中间状态,如普通的电磁直通阀、电磁换向阀、电液换向阀。
另一种是连续控制:阀口可以根据需要打开任意一个开度,由此控制通过流量的大小,这类阀有手动控制的,如节流阀,也有电控的,如比例阀、伺服阀。
所以使用比例阀或伺服阀的目的就是:以电控方式实现对流量的节流控制(当然经过结构上的改动也可实现压力控制等),既然是节流控制,就必然有能量损失,伺服阀和其它阀不同的是,它的能量损失更大一些,因为它需要一定的流量来维持前置级控制油路的工作。
液控伺服阀主要是指电液伺服阀,它在接受电气模拟信号后,相应输出调制的流量和压力。它既是电液转换元件,也是功率放大元件,它能够将小功率的微弱电气输入信号转换为大功率的液压能(流量和压力)输出。在电液伺服系统中,它将电气部分与液压部分连接起来,实现电液信号的转换与液压放大。电液伺服阀是电液伺服系统控制的核心。
液控伺服阀是在伺服系统中将电信号输入转换为功率较大的压力或流量压力信号输出的执行元件。它是一种电液转换和功率放大元件。伺服阀的灵敏度高,快速性好,能将很小的电信号(例如10毫安)转换成很大的液压功率(如几十匹马力以上),可以驱动多种类型的负载。过去人们曾把喷嘴档板阀、射流管或滑阀伺服马达等液压放大装置都列入伺服阀范围内。20世纪70年代以来,伺服阀一般仅指电液伺服阀。
电液伺服阀广泛地应用于电液位置,速度,加速度,力伺服系统,以及伺服振动发生器中.它具有体积小,结构紧凑,功率放大系数高,控制精度高,直线性好,死区小,灵敏度高,动态性能好以及响应速度快等优点。
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