摘要:
在液压随动系统中,广泛采用了喷嘴-挡板式液压放大器.本文通过一系列的实验,研究了喷嘴-挡板元件的力特性.实验中采用了不同内径的尖锐稜边喷嘴及具有不同端面外径与内径比值(相对直径)的非尖锐稜边喷嘴. 实验和理论分析结果表明,对于尖锐稜边的喷嘴,作用在挡板上的力与工作压力成比例关系,而与喷嘴和挡板之间的位移关系很小;对于非尖锐稜边喷嘴,力、位移和工作压力之间的实验特性曲线是非线性的和不对称的. 作者认为在功率控制液压放大器中,采用尖锐稜边的喷嘴是最适宜的.
Abstract:
The flapper-and-nozzle valve has been widely used as an amplifier in hydraulic servo-mechanisms. By means of a series of experimental studies, the force characteristics of flapper-and-nozzle valves are investigated. Sharp-edged nozzle and flat-faced nozzle with different ratios of outside diameter to inside diameter are used in these experiments.Results based on experiments and theoretical analysis show that, for sharp-edged nozzles, the force acting on the flapper is proportional to the working pressure, and the influence of the distance between nozzle and flapper is very small. For flat-faced nozzles, experimental characteristics curves of force, displacement and pressure are departed from linearity and symmetry.The sharp-edged nozzle-and-flapper combination is considered more suitable for power control amplifier.
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