基于三维流固耦合的簧片阀振动与碰撞分析

Analysis of Vibration and Impact of Reed Valve Based on 3D Fluid Structure Interaction

簧片阀广泛应用于微型压缩机上,由于工作中频繁动作并与阀座发生碰撞,易出现疲劳断裂。为评估簧片阀的工作可靠性,需分析阀片的振动、碰撞过程。阀片用壳单元离散,在阀片和阀座之间建立接触约束关系,通过三维流固耦合方法模拟簧片阀的动力过程。对某压缩机一级的工作过程进行仿真,获得了吸、排气阀的运动曲线、运动速度和动应力分布。计算结果表明:簧片阀工作过程中的振动主要为一阶弯曲,阀片开启时最大应力在根部,关闭时最大应力在阀孔中心处,阀片与阀座碰撞反弹系数在0.4~0.6之间。

Reed valves are widely used in micro-compressors,but they are prone to fatigue fracture due to bend vibration and collision with the valve seat during operation.In order to evaluate the valve reliability,it is necessary to investigate the vibration and collision of reed valve.Valve plate is discretized with shell element,and contact constraint is established between valve plate and valve seat.The valve dynamics is analyzed by 3D FSI(Fluid Structure Interaction)method.The displacement,velocity and dynamic stress of the suction and discharge valves are obtained through simulation for the first stage of a compressor.The calculation result shows that the vibration of the reed valve is mainly the first-order bending.The maximum stress is at the root when the valve is opening and at the center of the valve hole when it is closing.The rebound coefficient is between 0.4 and 0.6 when the valve plate impacting the valve seat.