Research On Air Cooling System Of High Power Supply Cabinet

The Asphalt pavement in-place thermal regeneration technology is increasingly valued by the relevant departments due to its fast construction schedule,short construction cycle and low impact on traffic,which meets the current demand for asphalt pavement maintenance in the context of highway traffic flow.During the construction of the microwave in-place heater,the total power of the microwave power supply is as high as 470.4k W and the ambient temperature is high,so poor heat dissipation will cause the internal components of the power supply to become too hot and the output power to drop.To address these issues,this paper uses a combination of thermal simulation analysis and experimental research to conduct an in-depth study of the air-cooled cooling system of high-power supply cabinets.A single microwave power supply model is built,thermal simulation analysis is carried out and the accuracy of the simulation model is verified through experiments,providing a basis for the design of air-cooled heat dissipation in the microwave in-place heating machine power supply cabinet.The air duct structure of the power supply cabinet was designed and analysed in a simulation model of the power supply unit.The reasonableness of the boundary conditions for the velocity inlet and the inlet fan was investigated and the results showed that the inlet fan boundary conditions were more reasonable.The influence of two factors on the cooling effect of the power supply cabinet,namely the angle of the induced air and the width of the air duct,is analysed and the influence law is obtained,on the basis of which a reasonable cooling duct structure is determined.A model of the air-cooled heat dissipation system of the high-power supply cabinet was established and thermally simulated.The results show that under this power supply cabinet heat dissipation duct structure,the continued increase of the axial fan speed has a limited improvement on the heat dissipation effect of the power supply cabinet.In order to further improve the proposed power cabinet cooling effect,a solution of adding ventilation holes in the cooling duct was proposed,and the results showed that this solution could improve the cooling performance of the power cabinet.Field test research on high-power supply cabinet cooling system,microwave power supply can work continuously for a long time under the ambient temperature of 50 ℃,the output power does not drop,high-power supply cabinet air-cooled cooling system to meet the design requirements.