| 摘要 |
The present invention comprises an improved heat exchanger finned tube and method and apparatus for producing elongated segments of the finned tube comprising knurling the outside surface of a central tube of heat conductive material, forming strip stock material into a continuous fin and spirally winding the fin about the outer knurled surface of the central tube. The fin comprises a foot portion to form a substantially L-shaped cross-section, the foot portion being in contact with the central tube and having a heel portion slightly overlapping a toe portion of the next succeeding fin wrap. A second knurling operation over the outer surface of the foot of the fin forces the foot portion to be deformed into the knurling present on the outer surface of the central tube and interlocking with the next succeeding fin wrap. The method and apparatus further comprises a transversely operated saw for cutting the finned tube to a desired length, automatic ejection of a tube pilot guide member and return of the pilot guide member to the operator.
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