| Mine ventilator is the main electromechanical equipment of mine ventilation system,and its safety performance is closely related to mine safety production.The traditional calculation model of fan strength calibration has been greatly simplified,which can not meet the reliability requirements of fan.However,with the rapid development of computer numerical simulation technology and finite element software,the use of numerical calculation software can make up for this deficiency.In this paper,a FBCDZ-6-№28 counter-rotating axial flow main fan is taken as the research object,considering the influence of fluid-solid coupling,the finite element simulation of fluid-solid coupling and the analysis of vibration response characteristics of the mine fan are carried out.The equivalent stress distribution and vibration response characteristic curve of the fan under different working conditions are obtained to help identify the potential risk parts of the mine fan,It provides data reference for fault analysis and optimization design.Firstly,In this paper,3D modeling software is used to establish a 1:1 3D model of a mine axial flow fan and a 3D model of the fan flow field.Using the ANSYS Mechanical APDL/FLUENT data coupling platform,the weak coupling method is used to analyze the fluid-structure interaction of the fan,and the numerical simulation results of the fluid-structure interaction of the main fan with three wheel-to-hub ratios are obtained.The equivalent stress distribution under different working conditions and loads is analyzed.It is found that the maximum equivalent stress points of the blades of the fan are located at the blade handle and the contact hub,and the maximum equivalent stress points of the overall structure of the impeller are located in the recesses of the impeller hub installation groove.According to the simulation result,the strength of the impeller hub and blades of the main fan was checked,and it was found that only Q235 A could not meet the strength requirements of the impeller.According to the conclusion of the fluid-structure coupling simulation of the fan at the design speed of 740 rpm,the fluid-structure coupling simulation analysis of the fan under the working condition of 1000 rpm was carried out,and compared with the simulation results at the speed of 740 rpm,it was found that the wind pressure of the main fan was increased.The lift with equivalent stress is huge.Secondly,the modal analysis of the ventilator was carried out by using Hypermesh software,and the modal natural frequencies and vibration shapes of the 1-12 th order modal of the main ventilator with three wheel-to-hub ratios were obtained.Through frequency analysis,it is found that the 9th-order modal frequency of the fan is close to the fundamental frequency,so attention should be paid to the frequency modulation process.Thirdly,using LS-DYNA software,the vibration characteristics of three kinds of hub ratio main fans were analyzed at 740 rpm design speed and 1000 rpm elevated speed,and the stress fluctuation curves and vibration speed curves of three kinds of wheel hub ratio main fans were obtained.The fatigue strength and vibration speed of the maximum stress point were checked,and the results showed that at 740 rpm,Q235A and Q345 A steels could meet the fatigue strength requirements of three wheel-to-hub ratios,and the vibration speeds of the three wheel-to-hub ratios in three directions were all in line with rigid support prescribed standards.At 1000 rpm,the Q235 A steel cannot meet the fatigue strength requirements of the main fan with a hub ratio of 0.65,while the Q345 A steel can meet the fatigue strength requirements of the three wheel hubs.The root mean square value of the Z-direction vibration velocity of the wheel hub ratio of 0.54 and 0.60 does not meet the rigidity.Bearing standard,but fully compliant with flexible bearing standard.Finally,the vibration response experiment is carried out on the experimental platform of fan company.The experimental results are compared with the simulation results.The results show that the deviation between the experimental results and the simulation results in three directions is less than 10%,which proves that the simulation results are more reliable. |
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