工程机械用比例减压阀冲蚀磨损特性研究OA

Electro-hydraulic proportional pressure-reducing valves are core components in the electro-hydraulic control systems of construction machinery.Their performance degradation directly affects system reliability,and erosion wear is one of the primary failure modes of such valves.Taking a typical proportional pressure-reducing valve as the research object,we adopt computational fluid dynamics and the Discrete Phase Model and combine with the Oka erosion model,to simulate the fluid-solid two-phase flow characteristics and erosion wear distribution inside the valve under different spool clearances,opening degrees and inlet-outlet pressure differentials.The rationality of the simulation results is verified through experiments.The study shows that erosion wear mainly concentrates on the throttling edge region of port P;the wear rate peaks at a spool clearance of approximately 15 μm and a pressure differential of 2.8 MPa;as the clearance continues to increase or the pressure differential further rises,erosion wear exhibits a decreasing trend.Valve port erosion leads to reduced pressure gain and increased internal leakage,which is the main cause of performance degradation.This research provides a theoretical basis for the failure analysis,life prediction and structural optimization of proportional pressure-reducing valves.