Inner ribbed tube of hard metal and method

Details Inner ribbed tube of hard metal and method Inner ribbed tube of hard metal and method

1996-06-25

1997-11-25

Leo, Leonard R.

Heat exchange

With coated, roughened or polished surface

165179, 165184, F28F 142

Patent

active

056901674

ABSTRACT:
A heat exchanger inner spiral-ribbed tube made of a hard metal such as stainless steel, titanium, or an iron-nickel alloy, and method of manufacture therefor for use in making a heat exchanger. The tube has an annular wall having an inner ribbed surface and an outer waved surface. The inner surface has a plurality of inner spiral ribs, each having a spiral angle. The spiral angle is about 18 degrees in the described embodiment. The tube-making method includes multiple steps in forming the outer waves and inner ribs simultaneously, progressively increasing the rib height while continuously pulling the tube in an axial direction.

REFERENCES:
patent: 3523577 (1970-08-01), Milton
patent: 3847212 (1974-11-01), Withers, Jr. et al.
patent: 4366859 (1983-01-01), Keyes
patent: 4938282 (1990-07-01), Zohler

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