Structure optimization and flow field simulation of plate type high speed on-off valve

Abstract

There is a relatively complex flow state inside the high speed on-off valve, which often produces low pressure area and oil reflux in the high-speed opening and closing process of the spool, causing cavitation and vortex and other phenomena. These phenomena will affect the stability of the internal flow field of the plate valve and the flow characteristics of the high speed on-off valve. Aiming at the problems of small flow rate and instability of internal flow field, a new spool structure was designed. The flow field models of two-hole and three-hole plate spools with different openings were established, and software Ansys Workbench was chosen to mesh the model. The standard k-ε turbulence model was selected for numerical simulation using Fluent software. The pressure distribution and velocity distribution under the same pressure and different opening degree were obtained. The structure and parameters of the optimization model were also obtained. The stability analysis of flow field under different pressure was carried out. The results demonstrate that the three-hole spool has a similar flow field change with the two-hole spool, but it does not create a low pressure zone, and the three-hole spool can work stably at 2 MPa or less. This method improves the appearance of low pressure area and oil backflow in the process of high speed opening and closing of spool. The stability of flow field and the flow rate of high speed switch valve are improved. Finally, the products designed in this paper are compared with existing hydraulic valve products. The results show that the three-hole plate type high speed on-off valve designed in this paper maintains the stability of the internal flow field under the condition of 200 Hz and large opening degree, and realizes the increase of flow rate.

Keywords

high speed on-off valve / flow field simulation / pressure and flow characteristics

References

[1] TuH C, RannowM B, WangM, LiP Y. Design, modeling, and validation of a high-speed rotary pulse-width-modulation on/off hydraulic valve [J]. Journal of Dynamic Systems, Measurement, and Control, 2012, 134: 1-13

[2] RannowM B, TuH C, WangM, LiP YThe advantages and feasibility of externally actuating a highspeed rotary on/off valve [C], 2011526537

[3] MauroV, AldoS. Hardware-in-the-loop (HIL) testing of ESP (Electronic Stability Program) commercial hydraulic units and implementation of new control strategies [J]. SAE Transactions, 2004, 113(6): 1177-1185

[4] MauroVA methodology to investigate the dynamic characteristics of ESP and EHB hydraulic units [C], 20061349513509

[5] MauroV, AldoSHardware-in-the-loop (HIL) testing of ESP (Electronic stability program) commercial hydraulic units and implementation of new control strategies [C], 2004111

[6] HuJ-x, LiJ-j, ZhongD-qing. High speed on-off valve and its development trend [J]. Development & Innovation of Machinery & Electrical Products, 2009, 22: 60-62

[7] TangB, LiuY-h, SiG-l, YangG-lai. Research on key technology of pilot type high flow high speed on-off valve [J]. Chinese Hydraulics & Pneumatics, 2018, 10: 76-83

[8] TianX-min. Electro-hydraulic valve timing mechanism without camshaft [J]. Foreign Internal Combustion Engine, 2000, 1: 62-63

[9] LeatiE, ScheidlR, PloeckingerAOn the dynamic behavior of check valves for high frequency oscillation pumps [C], 2013

[10] CaoB-g, GuoM-y, ShiW-x, KazuoN. Boundary element method analysis of flow field of cone valve [J]. Machine Tool & Hydraulics, 1991, 36: 2-10

[11] TangZ-y, CaoB-g, ShiW-xiang. Discussion on steady-state wave dynamic compensation method of hydraulic control valve-casing movement method [J]. Machine Tool & Hydraulics, 1995, 5: 91-95

[12] DengC-x, PanD-lin. Finite element analysis and optimization design of hydraulic cone valve [J]. General Machinery, 2004, 10: 61-63

[13] BatdorffM A, LumkesJ HFast-acting fluid control valve, 2010

[14] FangZ, LiZ-g, LiJun. Study on the influence of geometric parameters on the characteristics of hole seal leakage and blast heating [J]. Journal of Xi'an Jiaotong University, 2019, 53(1): 1-7

[15] SrikanthC, BhaskerC. Flow analysis in valve with moving grids through CFD techniques [J]. Advances in Engineering Software, 2009, 40(3): 193-201

[16] MiglioriniP J, UntaroiuA, WoodH G. A numerical study on the influence of hole depth on the static and dynamic performance of hole-pattern seals [J]. ASME Journal of Tribology, 2015, 137(1): 259-263

[17] ChildsD W, ArthurS, MehtaN JThe impact of hole depth on the rotor dynamic and leakage characteristics of hole-pattern-stator gas annular seals [C]//, 2013

[18] GuoC-shengSimulation of pressure regulating valve flow field and analysis of spool motion based on moving grid [D], 2013, Chongqing, Chongqing University

[19] HeQ-z, LiuY-c, ZhaoX-d, LiuJia. Opening characteristics of tri-eccentric butterfly valve based on CFD dynamic mesh technique [J]. Journal of Drainage and Irrigation Machinery Engineering, 2018, 12(5): 1-4

[20] LiPengApplication of unstructured dynamic mesh technique in flow field simulation of submunitions separation [D], 2013, Nanjing, Nanjing University of Science and Technology

[21] YangY, ZhangYi. Dynamic characteristics analysis of poppet valve and ball valve hydraulic valve based on AMESim [J]. Coal Mine Machinery, 2015, 36: 154-155

[22] FengY-j, JiangJ, CaiZ, ZhuH-xiang. Research on anti-pollution structure of hydraulic valve [J]. Construction Machinery, 2018, 49: 38-41

[23] ManG-jiaSimulation and experimental study on cavitation and noise of hydraulic cone valve [D], 2018, Harbin, Harbin University of Science and Technology

[24] XuJ-jinANSYS 13.0 Workbench numerical simulation technology [M], 2012, Beijing, China Water & Power Press

[25] WangX-j, ShenZ-q, ManG-jia. Simulation and experiment of cavitation phenomenon two-phase flow of hydraulic cone valve [J]. Journal of Harbin Institute of Technology, 2019, 51(7): 144-153

[26] MouJ-g, DaiD-s, GuY-q, LiuJ, WuD-h, MaYi. Influences of impeller ring structure on performance and flow field of centrifugal pump [J]. Journal of Central South University (Science and Technology), 2017, 48(6): 1522-1529