为揭示高压隔膜泵单向阀开合过程中流场与阀芯运动耦合机理，基于6DOF模型和动网格算法，构建单向阀流场与阀芯运动的耦合仿真模型。通过数值模拟，对单向阀的流场速度、压力分布及脉动特性进行分析，获得流场域随时间演变的速度和压力云图、全开度下的流场分布以及压力脉动时频域信息，并探讨弹簧参数及流体性质对阀芯运动的影响规律。结果表明：在单向阀一个开合周期内，位于阀隙流场处的流体流速激增，高速流体与腔内低速流体相接触形成剪切流动，在阀芯的周围流场形成大尺度漩涡特征；阀芯两侧流场存在较大压差，入口侧形成高压区，阀隙流场处呈现大幅度压力梯度变化且振幅波动显著，压力脉冲峰值频率集中在低频段内；随着弹簧刚度及预紧力增大，阀芯升程高度减小，回座撞击作用加剧，且预紧力对阀芯振荡影响较为显著；随着入口流量增大，阀芯升程高度增大，上升及回座速度增大，振荡幅度增大。

To reveal the coupling mechanism between the flow field and the valve disc motion during the opening and closing process of the check valve in a high-pressure diaphragm pump, a coupled simulation model of the flow field and the valve disc motion of the check valve was constructed based on the 6DOF model and the dynamic mesh algorithm. Through numerical simulations, an analysis was conducted on the flow field velocity, pressure distribution, and pulsation characteristics of the check valve. This analysis provided velocity and pressure contours that evolved over time, the flow field distribution at full opening, and the time-frequency domain information of pressure pulsation. Furthermore, the influence of spring parameters and fluid properties on the valve disc motion was explored. The results showed that during a single opening and closing cycle of the check valve, the fluid velocity in the valve gap increased significantly. The high-speed fluid contacted the low-speed fluid within the cavity, forming shear flow and large-scale vortex characteristics in the flow field around the valve disc. There was a significant pressure difference between the flow fields on both sides of the valve disc, with a high-pressure zone forming on the inlet side. The flow field at the valve gap exhibits large changes in pressure gradient and significant amplitude fluctuations, The peak frequency of pressure pulses is concentrated in the low-frequency range. With the increase in spring stiffness and preload, the lift height of the valve disc decreased, and the impact of the seat-back collision intensified. Furthermore, the preload had a more significant influence on the valve disc oscillation. As the inlet flow rate increased, the lift height of the valve disc also increased, resulting in an increase in the speed of both ascending and seat-back movements, as well as an increase in the oscillation amplitude.