Flow Field Analysis And Structure Improvement Of Self-sealing Refuelling Main Valve

As a terminal device for energy output in a fueling system,a refueling gun plays a role of using conveniently,controllability,and high reliability of oil delivery in the process of filling fuel tank.With the development of modernization,the high efficiency of energy and the development of new energy have gradually become the mainstream in current life.At present,in the environment where energy is gradually lacking,higher requirements are placed on the energy efficiency,environmental protection,and safety of fueling.On the basis of traditional oil guns,we have gradually developed more convenient self-sealing refueling guns and oil-gas recovery refueling guns,which have dominated the mainstream of domestic and foreign refuelling guns.However,the traditional self-styled oil guns in the market have the problem of low flow,self-sealing,and large flow and allergy.In order to solve this problem,this dissertation takes the main valve of XIDE80-B self-sealing oil gun as the research object,and mainly does the following works:1.According to the existing research status and the problems existing in the self-sealing oil gun,the purpose and significance of the research to be studied are clarified.Based on the theory of fluid mechanics and fluid dynamics,and based on the theory of computational fluid dynamics simulation software CFD,the calculation methods and methods used in the text are determined and a mathematical model is established.2.2.Steady state analysis of existing main valve structure,establishment of relevant equations based on fluid mechanics basis,and calculation of the relationship between the degree of vacuum generated within the main valve and the opening of the valve opening and the flow rate through steady state.The factors affecting the pressure distribution in the main valve's internal flow field are discussed.The main factors that affect the internal pressure distribution of the main valve are obtained by determining the valve core taper angle and the valve seat throat length,and the optimal valve core taper angle and valve seat throat are determined.Department length.3.The numerical calculation of the cavitation caused by the internal vacuum of the main valve was done.The influence of the main valve opening,the valve cone angle and the throat length on the cavitation was analyzed.In order to explains the relationship between changes in pressure distributionand cavitation in the valve furtherly.4.Transient analysis is performed on the main valve of the fueling gun using dynamic mesh and UDF technology.The vacuum degree is changed with the law of the movement of the valve core and the main valve response is 0.124 s when it is turned on and 0.1s when it is closed to meet the refueling gun.Within 0.3s the standard of skipping gun;set the damping in the valve seat,analyze the influence of the structure after adding the orifice on the vacuum degree of the main valve internal flow channel,and determine the optimal orifice diameter of 0.66 mm,and then the optimal orifice The model below was verified to ensure that it reached its intended purpose.