液压系统中的工作油液,既是传递动力的介质,又具有携带污物及清洗系统的作用。油液带着外界侵入和从系统中清洗下来的污物,流到元件的各敏感部位,造成各种危害。因此,从油液中清除污物是一项十分重要的工作。清除油液中污物的方法有两种。一种是过滤,主要清除固体污物。另一种是净化,主要清除水、空气等非固态污物。由于固体污物在油液中数量较多,危害较大,因此是清除的主要对象。本文着重介绍有关过滤方面的知识。一、过滤器的原理和类型 Working fluid in hydraulic system is not only the medium of power transmission, but also has the function of carrying dirt and cleaning system. Oil with the outside world invaded and washed away from the system of dirt, flow to the sensitive parts of the components, causing a variety of hazards. Therefore, the removal of dirt from the oil is a very important task. There are two ways to remove dirt in the oil. One is filtration, the main removal of solid dirt. The other is purification, the main removal of water, air and other non-solid dirt. As the solid dirt in the oil in a larger number, more harmful, it is the main target of removal. This article focuses on the filtering aspects of knowledge. First, the filter principle and type