Tubular heat exchanger and method for bending tubes

Details Tubular heat exchanger and method for bending tubes Tubular heat exchanger and method for bending tubes

1992-06-03

1993-06-29

Flanigan, Allen J.

Heat exchange

Side-by-side tubular structures or tube sections

126109, F28F 100

Patent

active

052225526

ABSTRACT:
The method of bending relatively thin wall tubing to form a tubular heat exchanger that has relatively tight bends with controlled wrinkles. For example, 1.75-inch outer diameter stainless steel tube may have a wall thickness of 0.035 inches and be bent using a controlled-wrinkle bend die to a 180.degree. bend having a centerline radius of 2.5 inches. The relatively high tube collapse that results from bending in such manner without the use of a ball mandrel does not detract from performance of the heat exchanger in a relatively low flow rate furnace application.

REFERENCES:
patent: 3438238 (1969-04-01), Crowe et al.
patent: 4464923 (1984-08-01), Boggs et al.
patent: 4877014 (1989-10-01), Beasley

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