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1.问题的提出 我公司生产的管壳式水冷冷凝器是制冷系统中的主要热交换器,设计上选用的换热管材料为纯铜管(材料代号T2,管径16mm,壁厚1.5mm),换热管与管板之间采用机械胀管连接。为提高换热管的热效率,除胀接部分余留一定长度外,其余部分均轧制成高肋螺纹。其外径大于换热管的原始外径和管板孔的孔径,因此,在组装完毕后换热管是不能更换的。否则,高肋螺纹部分将断裂成铜屑掉进冷凝器壳体内部,严重地影响系统的正常工作。 但在实际生产中,由于换热管轧制后没有严格试压或漏检,在组装焊接、胀管完毕后,试压过程中换热管单根或多根泄漏的现象屡有发生。此时,如果采用将两端堵塞的办法,将严重影响冷凝器的换热效果;否则只有报废处理,损失较大,两者都
1 issue put forward My company’s shell and tube water-cooled condenser refrigeration system is the main heat exchanger, the design of the selected heat pipe material is pure copper tube (material code T2, diameter 16mm, wall thickness 1.5mm ), Heat exchange tube and tube plate between the mechanical expansion pipe connection. In order to increase the thermal efficiency of the heat exchange tube, the remaining part is rolled into a high rib thread except for a certain length of the expanded section. Its outer diameter is larger than the original outer diameter of the heat exchange tube and the diameter of the tube plate hole, therefore, the heat exchange tube can not be replaced after the assembly is completed. Otherwise, the high rib thread will break into copper pieces into the condenser shell, seriously affecting the normal operation of the system. However, in actual production, there is no strict pressure test or missing test after the heat exchange tube is rolled. After the welding and expansion are completed, the single or multiple leaks of the heat exchange tube occur frequently during the pressure test. At this point, if both ends of the blockage approach, will have a serious impact on the heat exchanger effect of the condenser; otherwise only scrapped, the loss is greater, both