Heat exchanger tube with expanded ends

摘要

The larger diameter (C) of the expanded tube ends (1) exceeds the diameter (A) of the finned portions of the tubes. The small diameter of the tube in turn exceeds the tube diameter. In this, the ratio of the tube end diameters (1) (C:D) is larger than 3:1. The floor plate of the tube (3) is broached by passages (5) via interposed flexible seals made of plastics or rubber inserts (6), flexibly setting sealing paste eg. silicon paste etc. Diameter (D) is locally expanded (7) in the flat (11) sector of the tube to prevent this being pulled out