Research On High Frequency Vibration Mechanism And Structure Optimization Of Metal Sealing Wear-Resisting Ball Valve In Coal Chemical Industry

In the coal chemical industry in the delivery of high temperature,high pressure,high flow velocity and contains solid particles in the medium of the pipeline valve conditions are the worst.In coal liquefaction devices used in most of the metal sealing wear-resisting ball valve adopts of imported products,although the imported products are relatively mature,but the quality is uneven.And the valve is expensive,long supply cycle,it is difficult to meet the needs of the market.The domestic valve such as the vibration resistance,wear resistance and sealing performance can not be guaranteed to be resolved.On this important subject,based on the coal chemical metal sealing wear-resisting ball valve localization as the background,to delve into the core component of the valve structure,and carry on the optimization of structure,so as to solve metal sealing ball valve technical problems such as high frequency vibration,realize the localization of the valve.This paper first theoretical analysis of metal sealing wear-resisting ball valve vibration mechanism,and establish the mathematical model.Under the guidance of the theory,through calculation,get the inherent frequency equation and the resonance condition.Analysis of metal sealing wear-resisting ball valve structure parameters and flow parameters on the natural frequency of the influence law,by adjusting the structure,size and change the natural frequency,to prevent to produce resonance,so as to optimize the structure of the metal seal valve wear.According to the working condition of coal chemical industry requirements,designed a kind of square channel metal sealing wear-resistant ball valve.Ball and seat with a unique 360 degree gradually mirror surface grinding technology,can make the mirror of a vacuum formed between a sphere and valve seat,its sealing performance after frequent switch can still guaranteed.In addition,ball and seat using diamond spraying technology,can significantly improve the hardness and corrosion resistance.Through to the metal sealing wear-resisting ball valve key structure optimization design,and strength and vibration resistance respectively,to determine the valve structure,size and to ensure that the valve using performance as well as the continuous and stable operation in the coal chemical industry.Found through numerical simulation,this topic design party heart-shaped metal sealing ball valve in the same condition,the wear-resisting different opening of valve ball,seat keyparts by impact than ordinary round metal sealing ball valve decreasing,wear resistance was improved,prolong its service life greatly.In addition,through the numerical simulation of vibration characteristics,get the inherent frequency of the fluid value does not satisfy the resonance condition of the valve,and further verify the correctness of the theoretical research on the vibration characteristics of the valve,reduce the high frequency vibration on the impact of the valve and the damage of the use of the valve performance was improved.Finally,the pressure test and simulation condition test.The experimental results show that the design of the valve under the working condition of coal chemical industry wear-resisting,valve flexible motion resistance,no card.Ball and seat sealing pair of sealing performance and valve stem combination packing seal performance of flexible graphite ring.Spray coating abrasion conditions without shedding has good resistance to erosion and wear ability.And the valve in the pipeline system running smoothly for three months,not resonance occurs,to achieve the development of high-performance valve design requirements.