抄録
Contamination control is a technology to keep working fluids clean. Using a hydraulic filter is the commonest means of keeping the working fluid clean. The contamination level of a fluid exiting a filter increases with the operating time of the filter. The pressure loss across a filter element increases when the element retains contaminants. To describe these variations with operating time, this paper proposes:(1) a filter clogging model with an effective opening area;(2) a pressureloss model related to the effective opening area;(3) a filtration model concerned with the effective opening area and the mean lodging time of particles;(4) a quasi-single-pass test method for evaluating the filtration performance of a filter. The paper also shows a system of equations describing contamination levels in fluid power systems and discusses the relevant industrial standards which are presently widely used.
