气动增压阀流量特性研究

为气动增压阀的优化设计及气动增压阀选型提供理论基础,针对气动增压阀的工作过程,综合考虑活塞摩擦、空气热交换等因素,利用热力学第一定律、气体状态方程、连续性方程、能量方程、动量方程建立气动增压阀的非线性微分方程组,利用MATLAB/simulink进行模拟仿真,得到气动增压阀工作过程中增压腔、驱动腔内空气的流量及压力变化规律.最后对其流量特性进行实验研究,发现气动增压阀在输出0.5、0.6、0.7 MPa压力空气时最大耗气量、排气量随着增压比的增加而降低;排气效率为50%左右、效率为60%～70%.

Flow characteristics of pneumatic booster regulator

For the purpose of providing theoretical foundation for the optimization and selection of pneumatic boost regulator,and considering of the working process of pneumatic boosting regulator,piston friction,air heat exchange and other factors non-linear differential equations were set up by using first law of thermodynamics,gas state equation,continuity equation,energy equation and momentum equation,and by MATLAB/simulink,the variation of pressure and the flow of air in boosting chambers and driving chambers were obtained.According to the principle of simulation,pneumatic regulator was studied experimentally,and the curves of exhaust flow and pressure of air in tank were got.The simulation results are in good agreement with the experimental results,which show that the maximum air consumption and exhaust go down with the increase of boosting rate,and the air exhaust rate is about 50% while the efficiency is between 60%-70%.