Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1981-08-10
1984-06-05
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Assembling or joining
29506, 29516, 291573R, 291574, 29455R, 165177, 165178, 165141, 138114, B23P 1526
Patent
active
044519664
ABSTRACT:
A heat transfer tube assembly comprising a pair of fluid circulation tubes disposed co-axially one within the other, the inner tube being held substantially concentric within the outer tube by a plurality of pairs of diametrally opposed depressions or dimples formed in the peripheral surface of the outer tube at regular intervals. Each depression or dimple projects inwardly such as to engage and indent the peripheral surface of the inner tube and to cause a corresponding portion of the inner tube to bulge inwardly during forming of the dimples in the periphery of the outer tube by forming punches or, preferably, by two pairs of diametrally opposed rolls, each provided with an appropriate dome-shaped protuberance on its peripheral surface for roll forming the dimples as a result of longitudinally feeding the outer tube, with the inner tube disposed within the outer tube, between the rotating rolls. Preferably, the inner tube is double-walled and the axes of consecutive pair of opposite dimples are disposed at right angle to each other. The inner tube is thus coaxially supported within and assembled to the outer tube by the dimples, and a fluid may be circulated through the inner tube while another fluid is circulated in the annular space between the peripheral surface of the inner tube and the inner surface of the outer tube with the result that, when the fluids are at different temperatures, heat may be transferred from one fluid to the other through the wall of the inner tube.
REFERENCES:
patent: 1186572 (1916-06-01), Guibert
patent: 1618611 (1927-02-01), Trout
patent: 2174010 (1939-09-01), Patterson
patent: 3242558 (1966-03-01), Selig
patent: 3386497 (1968-06-01), Feldmeier
Goldberg Howard N.
H & H Tube & Mfg. Co.
Rising V. K.
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