Characteristics of Airborne 2D Electro-hydraulic Servo Flow Valve

ZUO Xiqing;LIU Guowen;JIANG Haibin;RUAN Jian;ZHAO Jiantao;ZHU Zhaoliang;Key Laboratory of Special Purpose Equipment and Advanced Processing Technology,Ministry of Education,Zhejiang University of Technology;Department of Mechanical and Electrical Engineering,Huzhou Vocational & Technical College;College of Mechanical Engineering,Quzhou University;

proportional rotary electromagnet;;servo flow valve;;variable transmission ratio;;lever-fork;;dynamic characteristic

With the widespread application of servo system in major equipment of industrial,military,aerospace and other important areas,there is a great demand for the electro-hydraulic servo flow valve which can response fast under the condition of high pressure and high flow. So the novel design project plan of 2D( two-dimensional) electro-hydraulic servo flow valve was made. The angular displacement of the proportional rotary electromagnet was detected by HALL sensor in this project,and compared with the input control signal to realize closed-feedback of angular displacement's signal. Variable transmission ratio lever-fork structure was adopted. In order to enhance the valve's control precision and anti-pollution capability,the rotary electromagnet angular displacement was proportionally converted into spool axial displacement by 2D technology which realized a closed-feedback of the chute sensitive channel. The mathematical model of the valve was established,and the simulation analysis was carried out on the whole system. Based on the analysis of the valve's mathematical model and system parameters, sample equipment was manufactured and the experimental study was carried out. When the system pressure was35 MPa and the spool displacement was 0. 8 mm,the valve's bandwidth was about 120 Hz,dynamic response time was about 5 ms,and the flow rate of 6 mm spool diameter was 60 L / min. The valve had a small and simple bodies,its weight was only one third of the same level valves. It also had low power consumption,and easy to realize closed-loop control,its static and dynamic performance was superior;therefore,the research result showed that it worked very well for airborne hydraulic system.