台阶型旋转热管传热性能的试验研究

AN INVESTIGATION OF HEAT TRANSFER PERFORMANCE OF STEPPED-WALL ROTATING HEAT PIPE

利用具有自蒸发循环的旋转热管冷却技术对旋转零部件 ,如电机主轴、切削刀具、混炼机转子、机床主轴等进行冷却 ,可大大减少转轴的热应力 ,提高转轴的使用寿命。设计了一种便于旋转热管内部工质既能顺利进行自蒸发循环 ,又利于制造加工的台阶型内部结构 ,介绍了实验装置 ,对台阶型旋转热管的启动性能、表面均温性能、最佳充液量和导热性能进行了试验研究。结果表明 ,台阶型旋转热管在 1min之内能迅速启动起来 ,表面均温性良好、没有过热点 ;其导热性能与旋转热管内部工质的流型、充液比V+ 、工作温度θ、转速n等因素有关。自蒸发循环旋转热管冷却技术与其他循环水冷却系统相比 ,具有良好的表面均温性、高效的导热性、无泄露 ,节约用水等优点。

Cooling the rotating machine, such as shaft of electric machine and machine tool, cutting tool, rotor of continuous mixer by using the self-evaporating circular cooling technique of rotating heat pipe (RHP) will greatly increase the service life of rotating machine by reducing stresses and high temperature degradation. The inner structure with stepped wall that help the working fluid carry through the self-evaporation circular smoothly and is manufacture fasily is designed. The experimental devices were introduced and the experimental research of the start-up performance, well-distribution of wall temperature,the optimum charge of working fluid and the heat transfer performance for stepped- wall rotating heat pipe was conducted. The experimental result shows that the rotating heat pipe can be started up in one minute with good distribution of wall temperature and with no over-heat. The heat transfer performances are influenced by the flow pattern of working fluid, the charge of working fluid(V^+), working temperature(θ)and rotational speed(n). Compared with other circular cooling technique, the self-evaporating one has many advantages such as high efficient heat conduction, good distribution of wall temperature of the rotor, no leak and saving water.