Finned metal tube and method for making the same

Details Finned metal tube and method for making the same Finned metal tube and method for making the same

1977-12-22

1981-11-17

Richter, Sheldon

Heat exchange

Tubular structure

With discrete heat transfer means

F28F 138

Patent

active

043006302

ABSTRACT:
A heat exchanger element has a metal tube with fins disposed radially and in rows, to increase the heat exchange surface. The improvement of the invention is that the fins are of elliptical cross section and are arranged in rows which are equally spaced, the major axes of the respective cross sections of the fins in a row being parallel, and being parallel to or at 90.degree. or at 45.degree. to the tube axis, each fin in a row being staggered with respect to the corresponding fins of the adjoining rows. For welding such fins to the tube, there is used a hollow electrode having its inner cavity of substantially cross-like shape and corresponding to the combined outline of two fins having the major axes of their cross section inclined at 90.degree..

REFERENCES:
patent: 1929444 (1933-10-01), Murray et al.
patent: 2004252 (1935-06-01), Sorensen
patent: 2181927 (1939-12-01), Townsend
patent: 2566318 (1951-09-01), Dalin et al.
patent: 3041262 (1962-06-01), Jens
patent: 3930941 (1976-01-01), Meerwald et al.

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