印刷电路板式换热器流道结构优化研究

Study on Channel Structure Optimization of Printed Circuit Heat Exchanger

印刷电路板式换热器(PCHE)采用扩散焊进行焊接,焊接压力沿换热板片的传递易出现中断,导致流道中部出现未焊合区。为提高焊合质量,本研究进行了流道结构优化,结果表明:增大矩形流道倒角有利于提高焊合质量,将冷热流道进行错位(使下层流道肋板处于上层流道中间),也可以改变板间轴向应力分布,提高焊合质量。

The printed circuit heat exchanger(PCHE)is welded by diffusion welding,but the existence of the heat exchange flow channel causes the interruption of the transmission of welding pressure along the heat exchange plate,resulting in the non-welding in the middle of the flow channel.In order to improve the welding quality,the optimization of the runner structure is carried out.The research results show that increasing the chamfer of the rectangular runner is beneficial to improve the welding quality.Dislocation of the hot and cold runners(to place the lower runner aid plate in the middle of the upper runner)can also change the axial stress distribution between the plates to improve the welding quality.