Study Of The Large Diameter Butterfly Valve Design And Hydrodynamic Torque Characteristics Based On IOT

Hydroelectric power as an important green energy in the world, it has been widely used; turbine units was main body of energy conversion, inlet valve was important auxiliary equipment for safety, butterfly valve is one of the important structure type for inlet valve. Research Content and innovation of this study, summarized as follows:(1) The structure and component of the hydropower system was summarized, it described the component and working conditions of the turbine inlet valve; the evolved trend and problems of large diameter butterfly valve as turbine inlet valve were discussed.(2) The DN5300 butterfly valve as the research object, the overall scheme of design of large diameter hydraulic control butterfly valve, we determine the appropriate structural design, which is the double eccentric truss over-flow type disc and closed valve by counterweight.(3) The three-dimensional model of the body and disc were established, the structure dimension of DN5300 body and disc were obtained by finite element analysis; Modal analysis was done by FEM for disc and the Karman vortex street frequency calculation for disc. Providing the sectional profiles of trailing-edge of disc, Effectively avoiding the structural damage caused by resonance,the optimization scheme for preventing and erasing the Karman vortex shedding resonance. Through the pressure test in factory and field conditions test, the above design method is feasible to verify the reliability of the calculation model.(4) CFD analysis model is established, the flow resistance coefficient, hydrodynamic torque coefficient and hydrodynamic force coefficient were obtained on the double eccentric truss and over-flow type butterfly valve in different opening degree; It comparison with the design manual coefficient corresponding, obtained both similarities and differences. To verify the design scheme used in this article and CFD analysis method is correct by the hydropower station working condition test that included emergency shutdown valve and open valve, so the method is proved have engineering practical value.(5) Study on the calculation method of damping oil pressure of dynamic emergency shutdown butterfly valve, through the field of emergency shutdown experiment and the inherent characteristics coefficient of CFD simulation were calculate the damping oil pressure. Comparison with the experimental tests, the change tendency is consistent on the damping oil pressure, the range of both error is acceptable for engineering design; the difference between the result of the experiment and CFD simulation data, and given measures to improve precision. By the site test results verify the correctness of CFD simulation model, the flow resistance coefficient, hydrodynamic torque coefficient and hydrodynamic force coefficient are accurate and reliable, and has engineering practical value.(6) The butterfly valve is designed with IOT module, through monitoring data provided by the IOT modules, extracts relevant data of its opening and closing process, Hydrodynamic torque and other data of product can be obtained in the actual operation, which support for optimization design of the new product. Thus, we obtain a new model of butterfly valve design process, namely: Valve finite element design ? the measurement of existing product valve at working condition ? data extraction and analysis based on IOT ? New product simulation optimization ? the measurement of new product at working condition. Through the cycle of process optimization iterations, accelerated the process of product optimization. Because the method can save the manufacture of the physical model, fluid test bench test process, improve the development speed and reduces the development costs.Based on the IOT intelligent valve control system, the operation of the valve data obtained through the cloud computing services, through data analysis for operation maintenance, fault alarm and diagnosis to provide the basis. In this article, a new method of design, can greatly save the cost, improve the product performance of R&D has the profound significance and wide engineering application prospects.