| 摘要 |
<p>A method of assembling a heat exchanger unit (12) that involves an expansion technique for securing a heat exchanger tube (18) to a number of fins (24) without physical intrusion into the tube passage. The method includes forming the tube (18) to have substantially parallel tube portions (26). Pairs of tubes portions (26) may be connected by a bend or an elbow (28) to yield a serpentine tube configuration. Each of the fins (24) is formed to include one or more apertures that are sized to receive the tube portions (26). The fins (24) are then arranged to form a fin pack (22), so that their apertures are aligned to form an aggregate passage through the fin pack (22). The tube portions (26) are then inserted into the aggregate passage, such that the elbow (28) (if present) and/or the ends of the tube (18) remain outside the fin pack (22). Finally, the tube portions (26) are expanded to contact and become mechanically secured to the fins (24) through the application of a compressive force in a longitudinal direction to the tube portions (26).</p> |
