Finned tube useful for heat exchangers
AssigneeSharp Kabushiki Kaisha
InventorsEtsutaro Miyata, Toshiya Tonomura
Life of this patent
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Abstract
A length of a tubing is helically wound with a fin made of a heat-radiating strip and which is corrugated to provide a series of transverse crimps. A base is provided by flattening a portion of the crimps with the use of pressure rollers at one edge of the strip when the section of the fin is "L" shaped, or at the middle of the strip when the section of the fin is "U" shaped in order to cling closely to the tubing. The fin is bent at the boundary area between the flattened portion and the crimped portion when the fin is helically wound around the tubing.
Claims8
A finned tube useful for heat exchangers comprising:
- a hollow tube;
- a "U" shaped fin made of a heat-radiating material and helically wound around said hollow tube;
- a plurality of radially extending corrugated crimps formed on the fin portion of the "U" shaped fin;
- and
- a base formed by flattening the crimps provided on the bottom of the "U" shaped fin, the base being forced into contact with the periphery of the tube.
Dependencies are inferred from the claim text.