REXROTH溢流阀DB10-1-52/315

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DB/DBW型先导溢流阀

1.结构和工作原理

DB型阀是先导控制式的溢流阀; DBW型阀是先导控制式的电磁溢阀。DB

型阀是用来控制液压系统的压力; DBW型阀也可以控制液压系统的压力，并且能在任意时刻使系统卸荷。

DB型阀主要是由先导阀和主阀组成。DBW型阀是由电磁换向阀、先导阀和主阀组成。

DB型溢流阀:

阀腔的压力油作用在主阀芯下端的同时，通过阻尼器和通道作用在主阀芯上端和先导阀的锥阀上。当系统压力超过弹簧的调定值时，锥阀被打开。同时主阀芯上端的压力油通过阻尼器、通道、弹簧腔及通道流回B腔(控制油内排型)或通过外排口流回油箱(控制油外排型)。这样，当压力油通过阻尼器时在主阀芯上产生了一个压力差，主阀芯在这个压差的作用下打开，这样在调定的工作压力下压力油从A腔流到B腔(即卸荷)。

DBW型电磁溢流阀:

此阀工作原理与DB型阀相同，只是可通过安装在先导阀上的电磁换向阀使系统在任意时刻卸荷。

DB/DBW型阀均设有控制油内部供油道和内部排油道控制油外供口和外排口。这样就可根据控制油供给和排出的不同形式的组合内供内排、外供内排、内供外排和外供外排4种型式。

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这两种蓄能器因为其局限性已经很少采用。但值得注意的是，有些研究部门从经济角度考虑在这两种蓄能器的结构上做一些改进，在一定程度上克服了其缺点。比如国内某厂采用改进弹簧式蓄能器的结构。加大弹簧外径（大于液压腔直径）、限定弹簧行程（将弹簧大载荷限定在许用极限载荷以内）的方法提高了蓄能器的工作压力和容量，降低了成本。

气体式

它以波义尔定律（PVn=K=常数）为基础，通过压缩气体完成能量转化，使用时首先向蓄能器充入预定压力的气体。当系统压力超过蓄能器内部压力时，油液压缩气体，将油液中的压力转化为气体内能；当系统压力低于蓄能器内部压力时，蓄能器中的油在高压气体的作用下流向外部系统，释放能量。选择适当的充气压力是这种蓄能器的关键。这类蓄能器按结构可分为管路消振器、气液直接接触式、活塞式、隔膜式、气囊式等。

蓄能器有两种用途。①当低速运动时载荷需要的流量小于液压泵流量，液压泵多余的流量储入蓄能器，当载荷要求流量大于液压泵流量时，液体从蓄能器放出来，以补液压泵流量之不足。②当停机但仍需维持一定压力时，可以停止液压泵而由蓄能器补偿系统的泄漏，以保持系统的压力。

蓄能器也可用来吸收液压泵的压力脉动或吸收系统中产生的液压冲击压力。蓄能器中的压力可以用压缩气体、重锤或弹簧来产生，相应地蓄能器分为气体式、重锤式和弹簧式。气体式蓄能器中的气体与液体直接接触者，称为接触式，其结构简单，容量大，但液体中容易混入气体，常用于水压机上。气体与液体不接触的称为隔离式，常用皮囊和隔膜来隔离，皮囊体积变化量大，隔膜体积变化量小，常用于吸收压力脉动。重锤式容量较大，常用于轧机等系统中，供蓄能用。