考虑瞬态流固耦合的高压隔膜泵单向阀冲击特性研究OA

To reveal the fluid-structure interaction characteristics and valve core impact failure mechanism of high-pressure diaphragm pump check valve,the fluid structure coupling model and valve core motion transient fluid structure coupling model during the opening and closing process of the check valve were constructed by integrating the fluid structure coupling and explicit dynamics theory,the variation rules of valve core structural deformation and equivalent stress were explored,and the impact response characteristics of the valve core during the reseating process were analyzed.The results show that:during the opening and closing process of the check valve,the deformation and equivalent stress of the valve core first increases and then decreases as time progresses,and the maximum deformation occurs at the rubber pad position of about 0.11 mm;the stress concentration phenomenon is observed at the end edge of the guide rod,and the maximum equivalent stress is 14.115 MPa.During the process of valve core reseating,the displacement along the axial direction of the valve core presents attenuation oscillation characteristics,and the final downward displacement is about 0.7 mm.At the moment of impact,the maximum equivalent stress at the junction of the gland and the valve cone is 37.6 MPa,which has a strong impact on the valve core structure,and is the main cause of structural fatigue;The stress of the valve seat increases first and then decreases along the inner cone,and the maximum equivalent stress on the upper contact surface between the valve seat and the rubber pad is 1.931 1 MPa,which makes the valve seat in this area form a double cone feature and affects the air tightness of the check valve.