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Vented heat transfer tube assembly
| Details |
Inventors: Lee, Marlow;
Assignee: Ateliers des Charmilles S.A. (Geneva, CH)
Primary Examiner: Scott; Samuel
Assistant Examiner: Focarino; Margaret A.
Attorney, Agent or Firm: Hauke and Patalidis
A vented heat transfer tube assembly comprising a pair of fluid circulation tubes disposed co-axially one within the other, the inner tube being double-walled and 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. The double-walled 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 double wall of the inner tube. The double-walled inner tube is made of coaxially disposed tubes or conduits, at least one of which is provided with longitudinal bulges forming fluted passageways or channels vented to the ambient, such that accidental leakage of fluid circulating in the inner tube, or of fluid circulating between the inner tube and the outer tube, is vented to the ambient, rather than causing intermixing of fluids. The venting passageways or channels may be filled with a chemically inert good heat conductive material, preferably in the form of a gel, and the two coaxially disposed tubes are in tight surface contact with each other between the fluted passageways or channels. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawing, and more particularly to FIGS.
1-3, a heat transfer tube 10 according to the present invention comprises a metallic elongated tubular conduit member or tube 12 having a second elongated tubular conduit member or tube 14 rigidly mounted concentrically within the outer tube 12, such that a generally annular space 16 is formed between the interior wall surface 18 of the outer tube 12 and the peripheral surface 20 of the inner tube 14.
The inner tube 14 is held substantially concentric to the outer tube 12 as a result of the outer tube 12 being provided with a plurality of concave indentations of dimples 22 projecting inwardly and radially such as to form a domed surface 24, FIGS.
2 and 3, engaged into a conforming inwardly directed depression or recess 26 formed in the peripheral surface 20 of the inner tube 14.
Preferably, a pair of diametrally disposed dimples 22 are formed at regular intervals, the axis of the dimples in each pair being at a right angle to the axis of the next consecutive pair of dimples 22.
In this manner, the inner tube 14 is held co-axially within the larger outer tube 12, without requiring any welding, brazing or other assembly arrangement, and an appropriate fluid, such as a liquid, may be longitudinally circulated through the annular space 16, while another fluid may be circulated through the interior 28 of the inner tube 14.
The inner tube 14 is made of welded-seam or, preferably, seamless metallic tube such as copper tubing and the like, providing good heat transfer from the interior 28 of the inner tube 14 through its wall to the annular space 16 surrounding its peripheral surface 20.
The outer tube 12 is also made of metallic seamless or welded-seam tubing, preferably of the same material as the inner tube 14 to prevent electrolytic corrosion of the wetted surface, especially where the surfaces are proximate or in firm contact with each other, for example where the domed surface 24 of the dimples 22 formed in the outer tube 12 engages the surface of the recess 26 formed in the peripheral surface 20 of the inner tube 14
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