Optimum Design of Direct Relief Valve with Air Gap Combination of Permanent Magnet Spring

doi:10.3901/JME.2018.20.297

Abstract

Abstract: The characteristics of aerospace servo system with high pressure and large flow put higher requirements on the reliability, precision and the thrust weight ratio of relief valve. However, the spiral compression spring with large thrust is generally large, and there are some failure modes such as stuck, fatigue fracture and plastic deformation during the service period, which brings hidden safety troubles to the servo system. A direct relief valve structure with air gap combination of permanent magnet spring is presented. The above-mentioned failures can be avoided because of non-contact permanent magnetic spring. By optimization design of air gap combination the ideal stiffness curve and thrust weight ratio can be effectively improved. Besides, the pressure fluctuation at opening due to large stiffness is reduced at the same time. Furthermore, the flange structure is designed accurately by finite element analysis to compensate the hydrodynamic force. The stabilized pressure precision is further improved. The simulation results show that this novel relief valve has good dynamic and static performance, and its design method provides reference for the application of the permanent magnet spring in the hydraulic system.

Key words: air gap combination, compensation of hydrodynamic force, permanent magnet spring, relief valve

CLC Number:

TH137

DANG Kunyuan, YANG Liman, LI Yunhua, SI Guolei, CHEN Junhui, WANG Wenjie, LIU Yuhui, QUAN Long, ZHAO Bin. Optimum Design of Direct Relief Valve with Air Gap Combination of Permanent Magnet Spring[J]. Journal of Mechanical Engineering, 2018, 54(20): 297-303.

References

[1] 金双峰,程鹏,姜膺,等. 弹簧的失效分析与预防技术[J]. 金属热处理,2011(增刊1):140-144. JIN Shuangfeng,CHENG Peng,JIANG Ying,et al. Spring failure analysis and prevention technology[J].Heat Treatment of Metals,2011(Suppl.1):140-144.
[2] YANG H,WU Q. The influence factor of valve spring rupture and reasons analysis[J]. Internal Combustion Engines,2010,4(2):37-40.
[3] FU C,YANG L,SI G,et al. Design and mechanical performance analysis of relief valve with permanent magnet spring[C]//International Conference on Aircraft Utility Systems,IEEE,2016:961-966.
[4] DANG K,YANG L,LI Y,et al. Design and analysis of relief valve with permanent magnet spring with steady flow force compensation[C]//The 9th International Conference on Fluid Power Transmission and Control,2017:392-398.
[5] NOVAK M,ERNOHORSKY J C,KOSEK M. Detailed measurement and simulation of FeNdB permanent magnet used for magnetic spring[C]//15th International Power Electronics and Motion Control Conference,IEEE,2013:DS1c.2-1-DS1c.2-8.
[6] 杨超君,孔令营,张涛,等. 调磁式异步磁力联轴器三维气隙磁场研究[J]. 机械工程学报,2016,52(8):8-15. YANG Chaojun,KONG Lingying,ZHANG Tao. Research on 3D air-gap magnetic field of field modulated asynchronous magnetic couplings[J]. Journal of Mechanical Engineering,2016,52(8):8-15.
[7] MIKOLANDA T,KOŠEK M,RICHTER A. Modelling and measurement of permanent magnets[J]. Acta Technica Csav,2010,55(1):63-81.
[8] YANG X,ZHANG B,LI J,et al. Model and experimental research on an electromagnetic vibration-powered generator with annular permanent magnet spring[J]. IEEE Transactions on Applied Superconductivity,2012,22(3):501-504.
[9] STEFAN G,LIENHARD P. Pressure relief valve with permanent magnets. IECON 2011-37th Annual Conference on IEEE Industrial Electronics Society,2012,6854(5):4074-4077.
[10] WANG Q,YANG F,YANG Q,et al. Study of a permanent magnet spring mechanism and its application to hydraulic valves[J]. Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2010,224(6):1229-1303.
[11] 蔡胜年,王勇,徐承韬. 永磁式喷油阀磁路优化设计及动态特性分析[J]. 机床与液压,2016,44(5):175-178. CAI Shengnian,WANG Yong,XU Chengtao. Optimization design and dynamic characteristic analysis of permanent-magnet injection valve magnetic circuit[J]. Machine Tool & Hydraulics,2016,44(5):175-178.
[12] 司国雷,杨逢瑜,王文杰,等.永磁压缩弹簧式溢流阀的设计与试验研究[J]. 排灌机械工程学报,2012,30(2):214-218. SI Guolei,YANG Fengyu,WANG Wenjie,et al. Design and experimental study on relief valve with permanent magnetic compression spring[J]. Journal of Drainage and Irrigation Machinery Engineering,2012,30(2):214-218.
[13] 李壮云. 液压元件与系统[M]. 北京:机械工业出版社,2011. LI Zhuangyun. Hydraulic components and systems[M]. Beijing:China Machine Press,2011.