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目前生产高效率热交换器,要求使用外径20—40毫米和筋与套管壁厚1到2毫米的内筋管。用挤压方法生产这种带纵向径向隔板的管材,由于工具复杂和强度不足是困难的[1]。因此,用组合结构代替整体结构是合理的。组合管的外部用铜或铝合金挤压成圆形套管,而内部用铝合金挤压成带筋的芯管。接着将套管带有间隙地套在芯管上,以拉伸的方法减径[2]。所研究的管材在芯管筋与套管间的边界处应特别结实地连接起来。这样才能保证热交换管接触区的气密性、最小的热阻力和高的使用性能。
Current production of high efficiency heat exchangers requires the use of inner tendons with outer diameters of 20-40 mm and ribs and casing wall thicknesses of 1 to 2 mm. It is difficult to produce such a pipe with a longitudinal radial partition by the extrusion method because of the complexity and lack of strength of the tool [1]. Therefore, the use of composite structure instead of the overall structure is reasonable. The outer part of the composite pipe is extruded into a round bushing with copper or aluminum alloy, while the inner part is extruded with aluminum alloy into a ribbed core pipe. Then the sleeve with a gap set in the core tube to stretch the method of reducing diameter [2]. The pipe under study should be particularly well-connected at the boundary between the core pipe and the bushing. In order to ensure the heat exchange tube contact area of the air tightness, minimum thermal resistance and high performance.