Prediction Model And Control Method Of Leakage Rate Of Gate Sealing Structure

In recent years, with the rapid development of modern industry, agriculture and science technology, people request on the performance of the static sealing device more strictly. As the typical sealing part, the gate is usually the weakest link in the security shell, To maintain the integrity of the gate sealing structure can avoid the occurrence of disaster. Bolt-flange-gasket structure is the most typical sealing device of the gate. It is of importance to study the sealing performance of this device. In the paper, based on the tightness theory, evaluation of influence factors of sealing structure leakage has been made, then, new leakage rate prediction model based on porous media seepage theory has been proposed. Combined with the finite element method, a complete set of leakage rate analysis scheme for this seal structure was presented.In order to evaluate the influence factors of sealing structure leakage, an analysis and comparison of the major influence factors of sealing structure leakage was made based on the tightness analysis method. By analyzing the influence of four main factors on leakage rate, the optimization collocation of the main factors was achieved through the orthogonal experiment method. The results showed that width of the gasket and the Medium pressure are relatively obvious impact on the leakage.Due to the limitations of the theoretical analysis, based on the new leakage rate prediction model proposed by the combination of porous media seepage theory and Hertz contact theory, quantitative analysis of sealing performance of circular gate was made. The main method to get the variation law of leakage rate with load was to combine leakage rate prediction model with mechanical analysis of gate sealing elements through the finite element way. the contact mean stress and actual contact width under different loads was brought into the model. The method could make a coupling analysis of the influence of interface microscopic structure and material mechanical behaviors. Finally, the leakage rate could be calculated independent with any experimental data.The model and method can not only be applied to the gate seal structure mentioned in this paper, but also can be used for the seal leakage analysis of the seal structure such as the isolation valve, ball valve and electric penetration piece. The prediction model has the characteristics of wide application prospect, strong applicability, accurate prediction, and it is worth popularizing.