Linear Solenoid Valve For Missile Engine Fuel Tank Control Technology Research

With the progress of computer control technology in today’s society,pneumatic control solenoid valve technology has been developed tremendously,because of its fast response,good repeatability,reliable operation,low impact by temperature,low power consumption and other advantages,currently has a wide range of application prospects,involving all walks of life,such as military products,construction machinery,automotive,instrumentation and other fields.As an important part of the missile tank pressurization system,the performance of the pneumatic linear control valve directly affects the stability of the gas pressure in the tank.Currently,most of the existing pneumatic control solenoid valves in the bomb tank system use pulse width modulation(PWM)control,which has a single control mode and may lead to the relative instability of the gas in the bomb tank,thus affecting its control accuracy.In order to solve this problem,this paper proposes to study a new type of pneumatic linear control solenoid valve for bomb tank pressurization,and a series of research works are carried out for this new pneumatic control valve,including theoretical analysis,modeling simulation,structure optimization and performance test.Through the working principle of the pneumatic linear control valve for ammunition,the research scheme and the model selection were determined,and the structure and parameters were calculated,including the sealing sub,spring,flow mask and the number of turns of the coil.Maxwell electromagnetic force simulation software was used to simulate the electromagnetic force of the integrated anisotropic isolation structure in the pneumatic linear control valve for ammunition at four representative positions,and the electromagnetic force characteristic curve of the armature at full stroke was obtained.It can be seen from the curves that the electromagnetic force on the armature tends to be stable with the change of spool opening when the anisotropic magnetic isolation mechanism is at the position of the lower middle of the coil;for the inlet pressure of2 MPa and 5MPa of the pneumatic linear control valve,the flow field is simulated numerically using Fluent fluid analysis software to obtain the magnitude of the airflow force under the full stroke of the spool.The simulated electromagnetic force,airflow force and calculated spring force provide data to support the study of the key control technology "electromagnetic force = airflow force + spring force" in the pneumatic valve for ammunition.Finally,the following performance of the outlet pressure change and tank pressure is studied by AMESim software,and the results show that the following performance is good without obvious hysteresis.The test system platform was built to test the static characteristics of pressure following of the pneumatic linear control valve for ammunition,and the test results show that the valve has good following performance and high control accuracy;finally,the valve was tested for mechanical vibration and high and low temperature environment,and after retesting,the valve still maintains good following characteristics.