| 摘要 |
<p>A steam heated dryer drum having one or more spoiler bars secured against its inner shell wall to extend longitudinally and substantially parallel with the axis of rotation. The spoiler bars generate turbulence in the condensate to lower the resistance to heat transfer through the shell wall. No screws, bolts, rivets or the like, which would necessitate penetration of the shell wall, are required or used to secure the bars. In one embodiment, the bars themselves have a bridge-shaped cross sectional configuration and are made of a magnetic material. Their bridge legs form the north and south poles of the magnetic bar and have their ends contoured to correspond to the drum shell radius of curvature. In another embodiment, magnets having a bridgeshaped cross section are used. These magnets'are of a relatively short, finite length which is considerably less than either the spoiler bar or the drum shell lengths and have their inner bridge opening contoured to fit over and hold the spoiler bar which is non-magnetic and extends longitudinally along the roll shell wall for as far as desired. The magnets are then spaced along the bar so that less magnetic material can be used.</p> |
