Study on Water Hydraulic 2/2 Directional Valve with Plane Piston Structure
Due to its fire resistance and environmental compatibility, using water as the working fluid in hydraulic circuits is receiving an increasing attention by both manufactures and users. Water hydraulics that offers components and systems for general commercial use is quite young. The water hydraulic components are being developed thoroughly. Materials, machining technology ,structures and so on must be examined for whether or not they are compatible with water when the components are designed.The internal leakage is normally a harmful phenomenon which should be minimized by the right design. This is emphasized especially in water hydraulics due to the low viscosity of the media. This paper introduce a water hydraulic 2/2 directional valve and its principle(Figl). The valve is composed of a hydraulically operated seat valve and a magnetic 3/2 direction valve. Aimed at the serious leakage and impact generating easily in reversing suddenly, an improved structure of water hydraulic directional valve is developed. When new water hydraulic directional valve is designed and manufactured, traditional space seal is changed to direct seal, compaction force between main valve spool and main valve pocket was logically designed and damper in pilot valve port is matched with sensitive cavity in main valve(Fig2).From the view of flow control, the methods of cavitation resistance of the directional water hydraulic valve are investigated. The computational fluid dynamics (CFD) approaches are applied to obtain static pressure distributions and cavitation images in the channel of the main stage of the valve with two kinds of structure(Fig3, Fig4, Fig5, Fig6, Fig7, Fig8). The results show that the method of optimized spout can effectively restrain cavitation. The work provides some useful reference for developing water hydraulic control valve with the lower noise and lower vibration.The structural parameters are optimized on the basis of information obtained from simulation. The experiments are carried out. Static test, dynamic test and life test are accomplished(Fig9, Fig10). The results show that the water hydraulic directional valve possess good property,its pressure loss is 1.1MPa lower, the switching time is shorter than 0.025s, strike crest is 0.8MPa lower(Figll, Figl2). The valve possess fine dynamic performance with the characteristic rapidly action and lower implusion. The life experiments are carried in normal condition, and the primary part arent shattered(Fig13). The performance of the water hydraulic directional valve has achieved the level of traditional directional valve.
water hydraulic directional valve Structure Optimization Flow Field Analysis.
Gong Yongjun Yang Huayong Wang Zuwen
The Laboratory of Fluid Power Transmission and Control, Dalian Maritime University,DaLian, 116026, C The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University,Hangzhou, 3100
国际会议
北戴河
英文
134-140
2007-06-06（万方平台首次上网日期，不代表论文的发表时间）