Double-walled finned heat transfer tube

Details Double-walled finned heat transfer tube Double-walled finned heat transfer tube

1980-07-11

1982-09-14

Husar, Francis S.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

165 70, 165183, 165184, 138104, 285 13, 291574, B23P 1526

Patent

active

043487947

ABSTRACT:
A double-walled finned heat transfer tube is provided for use in heat exchangers. The heat transfer tube includes an inner tube inserted within an externally finned outer tube. The assembly is subjected to a crimping operation which produces radial convexities along the length of the outer tube which serve to lock the inner tube and outer tube together in intimate heat conducting relationship and which produces radial concavities between the inner and outer tubes which serve as leakage channels. The crimping operation also produces grooves in the external finned surface which improves heat transfer between the assembly and an external medium.

REFERENCES:
patent: 2238798 (1941-04-01), Lenk
patent: 2365515 (1944-12-01), Baudry
patent: 2529545 (1950-11-01), Edwards
patent: 2586653 (1952-02-01), Hill
patent: 2724979 (1955-11-01), Cross
patent: 2913009 (1959-11-01), Kuthe
patent: 2981072 (1961-04-01), Brewington
patent: 3696863 (1972-10-01), Kim
patent: 3750444 (1973-08-01), Bittner
patent: 3777343 (1973-12-01), Onofrio
patent: 4232735 (1980-11-01), Kim

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