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浅谈液压系统蓄能器的结构形式及其分类
由蓄能器工作原理可知,活塞上部的气体实际上是为了给蓄能器加载用的,这种液压缸蓄能器叫气体加载式。按加载方法的不同蓄能器还有重锤式和弹簧式。
蓄能器的结构形式如图5所示。

1.重锤式蓄能器
图5(a)为重锤式液压缸蓄能器的工作原理图。其结构类似于柱塞缸,重物的重力作用在柱塞上。当蓄能器充油时,压力油通过柱塞将重物顶起,当蓄能器与液动机接通时,液压油在重物的作用下排出蓄能器,去液动机做功。这种蓄能器结构简单、压力稳定,但体积大、笨重、运动惯性大,有摩擦损失,一般在大型固定设备中采用。
2.弹簧式蓄能器
图5(b)为弹簧式液压缸蓄能器。弹簧力作用在活塞上,蓄能器充油时,弹簧被压缩,弹力增大,油压升高。当蓄能器与液动机相连时,活塞在弹簧的作用下下移,将油液排出蓄能器,去液动机做功。这种蓄能器结构简单、反应灵敏,但容积小,且不易用于高压。另外,因弹簧易振动,故此种蓄能器也不适用于工作循环频率高的场合。
3.气体加载式蓄能器
图5(c)、(d)都是气体加载液压缸蓄能器,加载用气体一般都为氮气。图5- 32(c)为活塞式,其中的气体和油液由活塞隔开,a为液压油口。其特点是工作可靠、寿命长,但动作不够灵敏、容积小、缸体与活塞的配合面加工要求高。图5 - 32(d)为气囊式,气体储存在气囊里,其特点是结构紧凑、反应灵敏,但气囊及壳体制造都较困难。
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