Design And Analysis Of Heat Dissipation Structure Of Mine High-voltage Frequency Conversion Unit

The conditions of the coal face are bad,transportation,installation and maintenance are difficult,and large-scale equipment is difficult to enter the well,which seriously restricts the exploitation and utilization of coal seam.The inverter unit is small in size,light in weight,low in system failure rate,small in electromagnetic interference and low in energy consumption,which reduces the system cost and the difficulty in equipment maintenance,and can fully meet the needs of coal mines.However,after integrating the inverter and the inverter motor,there are still some difficulties in the design of heat dissipation.In this thesis,the heat dissipation of the high-voltage frequency conversion unit for mining is studied,so as to improve the heat dissipation performance of the frequency conversion unit and solve the heat dissipation problem during the operation of the machine.In this thesis,3300V/1600kW mine high-voltage inverter unit is taken as the prototype.Firstly,the design of the heat dissipation structure of the inverter unit and the finite element calculation method of each part of the temperature field are studied,the simulation software ANSYS and its fluid theory system are described.Secondly,it describes the heat dissipation mode and heating mode of the frequency conversion unit,and uses the traditional calculation method to design and calculate the structure of the heat dissipation channel of the frequency conversion unit,and makes a brief comparison with the traditional channel.Then,the three-dimensional model of the variable frequency unit is established by Solidworks,and the flow field of the variable frequency unit,the reactance box and the motor is simulated by ANSYS Fluent,the purpose is to obtain the distribution results of pressure field,temperature field and velocity field of the cooling channel,the magnetic field of the motor is simulated by Maxwell simulation software,and the calculation results are introduced into the temperature field of each part for analysis and calculation,and then the temperature simulation results of each part of the inverter unit are obtained,the temperature simulation results of the frequency converter unit with and turnback cooling water channel are compared to verify the importance of cooling water channel to the heat dissipation of the frequency converter unit.Finally,the field test is carried out on the frequency conversion unit with and turnback cooling water channel,and the results of the two groups of text are compared,the comparison results further verily the importance of the spiral cooling channel.In addition,the field experimental data are compared with the simulation results,the error is smaller,the results show that the design of the water channel structure is more reasonable and meets the heat dissipation requirements of the inverter unit in mine.In this thesis,the heat-resistant grade,temperature change,circulating water flow and inlet and outlet temperature of each part of the high-voltage inverter unit are studied to determine the structure and length of the cooling water channel of the inverter unit;ANSYS Workbench simulation software is used to analyze the flow field of the cooling water channel,the magnetic loss of the motor part and the temperature field of the whole and each part of the inverter unit;in order to ensure the reliability of the design and theoretical analysis,the workshop load simulation experiment is carried out on the inverter unit,which verifies the rationality of the design;the research of this thesis has a certain guiding significance to solve the problems of heat dissipation of the high-voltage inverter unit for mining.