Study On Dynamic Characteristics Of Damping Chamber Of Quick Opening And Closing Valve

With the improvement of the mechanical industry system safety,the valve pipeline system is developing towards the direction of resist shock,vibration and corrosion.Due to the large mass and rapid action of the quick opening-closing valve disc,valve disc often causes severe impact and vibration,which makes the system unstable and even causes the failure of the sealing element,meanwhile affecting the lifetime of valves when moving to the stroke terminal.Therefore,improving the impact resistance of valves have great significance for the safe operation of quick opening and closing valves and similar pipeline systems in the mechanical industry.At present,there are a few studies on the valves based on the existing buffer mechanism and buffer structure of slender holes.The design system is unperfect and the mechanism of the porous structures on the dynamic characteristics are still unclear.In this paper,we research the existing damping chamber structure of quick opening-closing valve.Firstly,the dynamic model of the single-hole damping chamber is established based on the energy equation for the straight valve.Then,the dynamic numerical simulation of the flow field in the single-hole damping chamber and the porous damping chamber are carried out.Finally,a new U-hole damping structure is proposed based on the rotary valve.The main research contents are as follows:(1)Based on the research backgrounds and significances of this article,we introduce the importance of control valves in the machinery industry and the hazards caused by the impact of valves in special fields.We also put forward the necessity of researching the existing valve damping chamber structure and explaining the current research status about valve shock and damping mechanism,This subject uses theoretical models and numerical simulations to research the dynamic characteristics of valve damping chambers.(2)The dynamic model of single-hole damping chamber is established based on the energy equation.Calculation results of the theoretical models are analyzed though the known parameters.The accuracy of the dynamic model was verified by the experimental results.(3)Established numerical calculation models of single-hole damping chamber and porous damping chamber.Using Fluent dynamic mesh technology and user-defined programming to study the dynamic characteristics of damping chamber.The numerical simulation results of damping chamber with different chambers of holes and different holes are analyzed.The numerical results of 14 mm single-hole damping chambers are compared with the dynamic model and experimental results.(4)Based on the research,the dynamic model of U-shaped damping chamber is established according to the angular momentum equation,and using the calculation results of this model to analyze the pressure change in the damping chamber and damping plate rotation.(5)The research could provide references for structural design innovation of internal damping chamber of valve and theoretical guidances for the structural design and optimization of valve chack and damping chamber which improves the overall reliability of the valve;It has certain significance for practical engineering application.