Abstract：To solve the problems, such as large pressure drop and high energyconsuming in the flow channels in the multiway valve which centralizes control on multiactuator, and the motor for right travel is not sensitive enough etc, the hydraulic oil flow in the channel of the valve was analyzed and the effect of the channel structure on the minor pressure drop was clarified. In doing so, the geometry model of the right travel link of the multiway valve in an excavator was built by using Pro/E and the turbulent flow in the model was simulated by means of CFD SIMPLEC techniques. The results showed that in addition to the pressure drop in both the main valve port and the conduit between the inlet and the check valve, there is a significant pressure drop in the passage between the check valve port and the outlet. The pressure drop is proportional to the axial length of the passage; however, it is less affected by the angle of the passage. The drop is inversely proportional to the eddy scale and the number of vortex cores. The pressure drop in the multiway valve is measured as well, and the predicted drop is consistent with the experimental observations, suggesting the findings based on the analyzed results are reliable.
［1］杨华勇,曹剑,徐兵,等.多路换向阀的发展历程与研究展望［J］.机械工程学报,2005,41(10):1-5.Yang Huayong, Cao Jian, Xu Bing, et al. Progress in the evolution of directional control valves and future trends ［J］. Chinese Journal of Mechanical Engineering, 2005, 41(10): 1-5. (in Chinese)［2］冀宏, 傅新, 杨华勇.内流道形状对溢流阀气穴噪声影响的研究［J］.机械工程学报, 2002,38(8):19-22.Ji Hong, Fu Xin, Yang Huayong. Effects of internal structure on cavitating noise of hydraulic relief valve ［J］. Chinese Journal of Mechanical Engineering, 2002, 38(8): 19-22. (in Chinese)［3］刘荣,王宣银.GPCM控制阀内流道流场仿真［J］.农业机械学报［J］.2005,36(4):72-74.Liu Rong,Wang Xuanyin. Simulation study on flow field of gallery of GPCM control valve［J］. Transactions of the Chinese Society for Agricultural Machinery,2005,36(4):72-74.(in Chinese)［4］仇宝云,林海江,袁寿其,等.大型水泵出水流道优化水力设计［J］. 机械工程学报,2006,42(12):47-51.Qiu Baoyun,Lin Haijiang,Yuan Shouqi, et al. Optimum hydraulic design for discharge of passage of lager pump ［J］. Chinese Journal of Mechanical Engineering, 2006， 42(12): 47-51.(in Chinese)［5］陈松山,葛强,周正富,等.大型泵站双向进水流道三维紊流数值模拟［J］.江苏大学学报:自然科学版, 2005,26(2):102-105.Chen Songshan, Ge Qiang, Zhou Zhengfu,et al. Numerical simulation of threedimensional turbulent flow for reversible intake passage in large pumping stations［J］. Journal of Jiangsu University: Natural Science Edition, 2005,26(2):102-105. (in Chinese)［6］Wang Youjie, Gao Dianrong,Zhang Dajie,et al. Simulation and analysis on the flow field of the novel axial piston motor pump［C］∥Proceedings of the 7th International Conference on Fluid Power Transmission and Control. Hanzhou: World Publishing Corporation, 2009: 798-802.［7］Franco N, Rosado T E, Dorantes G O,et al. CFD performance evaluation and runner blades design optimization in a Francis turbine ［C］∥Proceedings of the ASME Fluids Engineering Division Summer Conference. New York: Amer Soc Mechanical Engineers, 2009: 2253-2259.［8］Amirante R, Del V G, Lippolis A. Evaluation of the flow forces on an open centre directional control valve by means of a computational fluid dynamic analysis ［J］. Energy Conversion and Management, 2006, 47(13／14): 1748-1760.［9］胡国清.多路换向阀流道的优化计算方法——代数应力模型［J］.机床与液压,1995,23(4):203-206.Hu Guoqing. Multiple directional control valve port optimization calculation method—Algebraic stress model［J］. Machine Tool and Hydraulic, 1995,23(4): 203-206. (in Chinese)［10］赵阳,郑政宝.基于流场仿真的多路阀流道结构优化设计［J］.流体传动与控制,2007(3):23-25.Zhao Yang, Zheng Zhengbao. Optimum design of flow passage in directional control valve based on flow simulation ［J］. Fluid Power Transmission and Control, 2007(3): 23-25. (in Chinese)
