| Mine emergency rescue submersible pump is a special fluid mechanical equipment,widely used in the coal mining industry,mine emergency rescue submersible pump generally has high hydraulic performance,but in the coal mine water seepage accident emergency conditions,in addition to the need to meet the normal hydraulic characteristics,Also need to ensure small volume,light weight,simple structure,good portability,smooth operation and other characteristics and good axial force balance ability,at the same time to meet the structural strength and vibration characteristics to meet the allowable requirements.Therefore,in order to improve the hydraulic characteristics of the mine emergency rescue submersible pump and have the above-mentioned advantages,this paper first introduces the research status of the mine submersible pump at home and abroad,summarizes the shortcomings of the submersible pump structure,combined with the special use environment and design requirements of the submersible pump,draw on the advantages of the existing structure at home and abroad,A two-stage mine emergency rescue submersible pump structure is proposed as the research object.The main contents are as follows:The center hole structure is introduced into the motor rotor of the high-speed submersible pump,and the symmetrical impeller is arranged.Based on CFturbo and Solidworks,the threedimensional solid model diagram and the full flow channel fluid domain model of the two-stage mining emergency submersible pump are drawn.According to the whole flow field of submersible pump grid division and numerical simulation,the submersible pump external characteristics analysis and hydraulic characteristics numerical simulation analysis;Based on the steady-state characteristic analysis,the distribution characteristics of static pressure,flow velocity and turbulent kinetic energy in the whole flow field of two-stage mine emergency submersible pump under different working conditions are obtained.At the same time,the cavitation allowance and internal static pressure under cavitation of submersible pump are analyzed.The numerical simulation results show that compared with the designed performance index,the outlet pressure is increased by about 0.4MPa,the head is increased by about 40 m,and at the same time,it has a certain high speed emergency overload capacity.The pressure pulsation of mine emergency rescue pump is studied by means of transient characteristics,and the pulsation value at each monitoring point is studied in time-frequency and time-domain,the results showed that 6 times in the highest pressure pulsation amplitude near pressure impulses,the rotor hole fluid field of the pressure pulsation is higher,but the interior of the pump flow smooth operation and reliable;Based on the fluid-structure coupling characteristics of ANSYS,the stress and strain of the impeller and rotor under rated working conditions were analyzed,and the modal analysis was conducted under four kinds of prestressed conditions.The results showed that the structural strength of the impeller and rotor met the requirements,the firstorder natural frequency was ten times higher than the main frequency of the impeller 83.33 Hz,and the vibration amplitude of the impeller and rotor system was low.Meet the normal working requirements of mine emergency submersible pump. |
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