Research On Structure And Properties Of Pure Water Safety Valve Used In Coal Mine Hydraulic Supporter

Water hydraulic will be widely used in some industrial areas,such as food,paper and metallurgy for its advantage of fine condition,safety and cleanness. With the development of material science and modern processing technology, developing water hydraulic component become possible.And human devoting much attention to saving energy and protecting environment,water hydraulic techonolgy become research focus at home and abroad. The thesis firstly analyses the water hydraulic on the safety valve of coal mine hydralic supporter.In the thesis,water safety valve is systematically and deeply researched by combining theory analysis and computer simulation together. Considered the physical and chemical characteristics of water sufficiently, the key technical problems existing in the water valve were analyzed and solved from the aspects of material, seal form, new structures.Concrete structure of Water safety valve used in coal mine hydraulic supporter are presented for the first time. Computational fluid dynamics methods were applied to simulate in the water safety valve spool internal with different structure parameters.Through flow equations of safety valve and force equations of valve core, dynamic performance of safety valve was analyzed.In the thesis, present status of water hydraulic and safety valve is introduced.Key technologies of water safety valve are expounded and solutions are proposed.The structure and working principle of safety valve are analysed,which takes the slide-valve structure,with the valve being made of austenitic stainless steel, valve core and seat made of corrosion resistant materials having the best anti-cavitation performance and its main sizes are designed. FLUENT is used to simulate the flow in water safety valve,the simulation results show that the negative pressure appears in the left edge of the valve hole, which ,moreover,is focused on one point.From the aspect of cavitation,the valve core with 6 holes has a minimum negative pressure and is less likely to get cavitation,.thus being the best choice. the structural preformance of water safety valve is built and its dynamic performance studied.Dynamic performance of water safety valve is simulated using mathematical model.Then the main factors which affects the stability of valve work are obtained. The simulation results indicate that the water relief valve has good performance and can be adopted in practical application.Finally a brief summary on research work of this thesis is provided. Also some researches that need to do by next step are pointed out.