| The difference between large diameter multi-stage energy dissipation fixed cone valve and ordinary fixed cone valve is that the former is equipped with a specially designed guided flow dome. Large diameter multi-stage energy dissipation fixed cone valve has several innovative designs. It has all the characteristics of ordinary fixed cone valve, in addition to all occasions available for ordinary fixed cone valve, it can also be applied to high differential pressure occasion and energy dissipation in pipeline occasion.There is not enough study in large diameter multi-stage energy dissipation fixed cone valve structure optimization design. In this paper, the structure optimization theory and finite element method are optimized for fixed cone valve. It can improve the reliability of the product, reduce manufacture costs. The flow coefficient and the effect of energy dissipation of fixed cone valve are calculated by CFD numerical simulation.Research and conclusion of this paper is mainly reflected in the following aspects:(1)The structure and principle of fixed cone valves were analyzed. Through Combining with a power plant project and analyzing the working conditions, this paper proposes a new multi-stage energy dissipation structure guided flow dome which is applied to energy dissipation in pipeline.(2)Use finite element analysis software Solid Works Simulation to calculator and optimize the preliminary design valve in work conditions, test its strength and seal tests, the valve has reached requirements of lightweight. Testing and inspection the finally optimization product, make strain test and displacement test, evaluate of the valve, and then compare and analysis the stress with the finite element calculator, finally got the conclusion that the FEA result keep the same with the fact test. Results of optimized design meet the requirements, in order to verify the accuracy of the finite element method. It can be used for the design of guidance.(3)Through the CFD numerical analysis and comparison of three kinds of valves and specially designed guided flow dome, select optimum structure.(4)Propose a method of model test and manufacturing shrunken proportions DN250 PN16 fixed cone valve and guided flow dome in accordance with the similarity theory. Energy dissipation test that similarity conditions was complete. Compare the test results with the calculated flow coefficient by CFD software value; prove the correctness of the principles of CFD calculation method and related formulas.In this paper, based on studies for large diameter fixed cone valve with multi-stage energy dissipation structure, established a set of design optimization method for fixed cone valve, flow coefficient calculation, stress and strain and displacement. And build the experimental model. Comparing the experiments data and the analysis data, we got some valuable conclusions and provide a set of feasible design and research method for large diameter fixed cone valve with multi-stage energy dissipation structure. This study not only short the design cycle and save manufacturing costs, but also has profound significance for the design of fixed cone valve. |
