| 摘要 |
<p>1520941 Heat exchanger PEERLESS OF AMERICA Inc 7 Jan 1976 [14 Jan 1975] 00420/76 Heading F4S [Also in Division B3] A heat transfer element (e.g. of aluminium) comprises fins with openings 29 therethrough, the fins having deen formed by making cuts at an acute angle into a tubular member 2 with openings 23 in the surface thereof and turning the cut portions outwardly. The interior of the tubular member as shown is formed by a plurality of longitudinal openings 12-15 but in a modification (not shown) there is only one. As shown in Fig. 1, separate fins 4 have been formed across the tubular body portion 3 by cutting into ribs 11 of the tubular member 2. As shown in Fig. 5, each fin extends entirely across the tubular body portion. In both Figs 1 and 5, some fins have notches 30 in their edges and some do not. The fins may have a height of ¢ inch and a thickness of 2-thousandths to # inch. The openings 23 may have been made by rollers (25, 26), Fig. 2 (not shown), with conical teeth, the rollers simultaneously moving the tube in the direction of arrow 24.</p> |
