Design And Research Of Airborne Two-dimensional(2D) Electro-hydraulic Directional Valve And Its Electromechanical Converter

In the development of modern aviation technology,electro-hydraulic reversing valve is one of the essential electro-hydraulic control components in the entire airborne hydraulic system,which has an important impact on the performance and reliability of the entire system.Compared with the traditional directly push type onboard electro-hydraulic control valve,the two-dimensional(2D)structure of the electro-hydraulic control valve avoids the electromagnet directly driving the main spool to move,but uses the driving spool to adjust the spool sensitive cavity.The high-pressure oil inside drives the main spool to move,so it has the advantages of small weight,high pressure resistance,high work-to-weight ratio,convenient driving,high antipollution level,etc.,and has been widely used in the aerospace field in recent years.Based on the actual needs,this paper designs two technical solutions by using the technical advantages of 2D valves and studies them follows:(1)Two airborne 2D electro-hydraulic reversing valves are designed according to the corresponding technical requirements.In order to realize its predetermined function,two electro-hydraulic reversing valve design schemes with different working principles are proposing and completing.And finished the structural design of the valve body structure and electromechanical converter modules.(2)The corresponding mathematical models are established for the electromechanical converters of the two valves,and the magnetic field simulation research is carried out by using Maxwell software.The variable parameters are simulated by the factors affecting the distribution structure of the magnetic circuit,so as to improve the output torque.At the same time,the thermal stability of the two electromechanical converters under extreme conditions is not more than 85 °C.(3)The important structure and components of the pilot body 2D electro-hydraulic directional control were calculated and checked such as valve body pressure strength,valve opening degree,main spool driving force,return spring,etc.While the flow field structure of the valve body was simulated.(4)A corresponding experimental scheme for the working principle of the pilot 2D electrohydraulic reversing valve was designed,The pressure flow characteristics and dynamic response characteristics of the valve,as well as the output characteristics and step response characteristics of the valve electromagnet were experimentally studied.The maximum outlet flow rate reached 112 L/min,and other experimental results met the design requirements.The pilot-mounted airborne two-dimensional(2D)electro-hydraulic reversing valve studied in this paper has the advantages of simple structure,large flow,high work-to-weight ratio,strong anti-pollution ability,etc.,and greatly improve the weight-to-weight ratio of the whole valve under the premise of ensuring reliability which is particularly suitable for use in the hydraulic system of an aircraft.