高速列车牵引变流器中IGBT的相变冷却实验研究

Phase Change Experiment of IGBT in Traction Converter of High Speed Train

以CRH2型动车组的牵引变流器冷却系统为研究依据,确定了牵引变流器中功率元件IGBT的冷却方案以及功率元件IGBT的冷却系统结构,利用CAD平面制图软件绘制相变冷却系统的零件结构,借助Solid Works三维造型软件构建相变冷却系统模型,最终确定了冷却物理模型,建立了牵引变流器功率元件IGBT相变冷却系统实验台。对安装有微槽结构形式冷却基板并充入制冷剂的圆管散热器进行了在不同加热功率及不同风速条件下的散热性能测试,获得了不同工况下相变冷却系统的总传热系数及冷板下表面温度在不同风速下的变化,证明了加热功率和风速对系统换热能力的影响。最终为相变冷却系统的设计提供了设计思路,也为工质相变产生机理提供了研究依据。

Based on the cooling system of China Railways CRH2 traction converter, cooling solution and structure of cooling system of power component IGBT in traction converter are determined, The parts＇ structures of phase change cooling system are drawn by CAD and the models are built by using Solid Works, Finally, the cooling physical models are established, test bench of IGBT power component＇s phase change cooling system is built, cooling performance of the tube radiator which is filled with refrigerant and installed in small groove forms of different heating power and wind conditions. Over coefficient of heat transfer and temperature of cold plate＇s lower surface in different conditions is obtained, the affect of heating power and air speed on the heat transfer of system is proved, finally, design idea is provided for phase cooling system, and is also provided research basis for mechanism about refrigerant phase change.