限制器型线对舌簧阀动态应力影响的数值研究  

Numerical Investigation of Reed-type Valve Dynamic Stress With Different Lift Limiter Shapes

作　　者：马晶晶 孙金菊[1] 樊宏周[1] 王胜利 龚宇 MA Jingjing;SUN Jinju;FAN Hongzhou;WANG Shengli;GONG Yu(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《工程热物理学报》2022年第6期1528-1534,共7页Journal of Engineering Thermophysics

摘　　要：为探讨往复式压缩机升程限制器型线对阀片动应力的影响,将阀片的单质点模型与压缩机热力学模型相结合,其中前者包括微分形式的阀片运动方程,后者包括气体工质的质量守恒方程和能量守恒方程。采用四阶龙格–库塔法对模型方程组进行耦合求解,并发展相应Fortran程序,预测了排气阀片上的动态压差。将获得的动态压差作为输入数据,利用ANSYS/LS-DYNA软件对阀片变形进行预测。在阀片与限制器碰撞瞬间,通过圆弧与直线的曲线拟合逼近阀片变形曲线,进而获得复合型限制器型线。分别对新设计的圆弧–直线型限制器和传统直线型限制器及圆弧型限制器的阀片动应力进行模拟预测。数值结果表明:新设计的圆弧–直线型升程限制器有效降低了动应力集中,利于提升阀片使用寿命。To explore the influence of lift limiter shape of reciprocating compressor on reed-type valve dynamic stress,a one-degree-of-freedom model of valve plate is incorporated with the compressor thermodynamic model,where the former includes the differential equations of the valve plate motion and the latter includes the mass and energy conservation equations for the working medium of air.The fourth-order Runge-Kutta algorithm is used to solve the coupled equations and a corresponding Fortran code is developed.With which,the dynamic pressure difference over the discharge valve plate is predicted.With the obtained dynamic pressure difference over the valve plate acting as input data,the valve plate deformation is predicted with ANSYS/LS-DYNA package.At collision instant of the valve plate and lift limiter,the arc-linear limiter is designed through the curve-fitting of an arc and straight line by allowing for the valve plate deformation.Dynamic stresses of the valve plate are predicted respectively for the newly designed arc-linear limiter and the conventional linear and arc limiters.The numerical results show that the newly designed arc-linear lift limiter significantly reduces the dynamic stress concentration and it is favorable for enhancing the valve plate life span.

关 键 词：往复式压缩机 舌簧阀 升程限制器型线 动态应力 

分 类 号：TK45[动力工程及工程热物理—动力机械及工程]