|
|
Twostep throttle properties of hydraulic valve ports |
YUAN Shi-Hao, YIN Chen-Bo, LIU Shi-Hao |
(1.Institute of Automobile and Construction Machinery, Nanjing University of Technology, Nanjing, Jiangsu 210009, China; 2.Institute of Electrical and Mechanical Enginering, Hainan University, Haikou, Hainan 570228, China) |
|
|
Abstract The geometrical features of the U and V ports as well as their combinations (U-U, U-V and V-V) were analyzed, and then the throttle areas of those ports were calculated in a simplified manner so as to investigate two-step throttle properties of hydraulic valve ports. The ratio of throttling areas in terms of valve opening was obtained, and it was observed that the location of the minimum throttle area of U port varies; however, this is not true for V port. The cavitation functions of U and V ports against opening were obtained and the cavitation curves also were plotted by using cavitation number σ. According to the cavitation functions, it was observed that the severe cavitation zone in U port varies with opening, but that in V port is fixed. When the inlet and outlet of throttling port are reversed, there is an obvious change in cavitation number at the same opening. The stiffness analytical formulas for U and V orifices were derived and the stiffness curves were calculated under various pressure differentials across a port and openings. For a lower pressure differential and a smaller opening, a stiffer stiffness can be achieved.
|
Received: 05 March 2012
Published: 30 November 2012
|
|
|
|
[1]Ye Qifang, Chen Jiangping. Dynamic analysis of a pilotoperated twostage solenoid valve used in pneumatic system[J].Simulation Modeling Practice and Theory, 2009,17(5):794-816.[2]Dasgupta K, Karmakar R. Modeling and dynamics of singlestage pressure relief valve with directional damping[J]. Simulation Modeling Practice and Theory, 2002,10(1/2):51-67.[3]Choi JinKeun, Jayaprakash Arvind, Chahine Georges L. Scaling of cavitation erosion progression with cavitation intensity and cavitation source[J]. Wear, 2012(278/279):53-61.[4]Jazi A, Masjedian, Rahimzadeh H.Waveform analysis of cavitation in a globe valve[J].Ultrasonics, 2009(49): 577-582.[5]Catania A E, Ferrari A, Spessa E.Temperature variations in the simulation of highpressure injectionsystem transient flows under cavitation[J].International Journal of Heat and Mass Transfer,2008,51:2090-2107.[6]Li Zhang, Jing Luo, Yuan Ruibo, et al. The CFD analysis of twin flappernozzle valve in pure water hydraulic[J].Procedia Engineering, 2012,31:220-227.[7]Fu Xin, Du Xuewen, Zou Jun, et al.Simulation and experiment of bubbly flow inside throttling groove [J]. Chinese Journal of Mechanical Engineering, 2007, 20(5):37-41.[8]施卫东,张启华,陆伟刚.新型井泵水力设计及内部流动的数值模拟[J].江苏大学学报: 自然科学版,2006,27(6):528-531.Shi Weidong, Zhang Qihua, Lu Weigang. Hydraulic design of newtype deep well pump and its flow calculation [J].Journal of Jiangsu University: Natural Science Edition, 2006,27(6):528-531. (in Chinese)[9]冀宏,张继环,王东升,等.滑阀矩形节流槽阀口的流量系数[C]//第六届全国流体传动与控制学术会议. 兰州:兰州理工大学, 2010:74-77.[10]冀宏,王东升,刘小平,等.滑阀节流槽阀口的流量控制特性[J].农业机械学报, 2009, 40(1):198-202.Ji Hong, Wang Dongsheng, Liu Xiaoping, et al. Flow control characteristic of the orifice in spool valve with notches [J].Transactions of the Chinese Society of Agricultural Machinery, 2009, 40(1):198-202. (in Chinese) |
|
|
|