| 摘要 |
<p>A sheathed electrical resistance heater (10) comprises a metal corrugated resistance heating element (14) located within a surrounding metal sheath (12) and separated from the sheath (12) by a compacted insulating material (16) (e.g., magnesium oxide). The corrugated resistance element (10) is a flat strip corrugated by passing the strip through the nip of a pair of gears.(24) The corrugated strip resistance element (14) is thicker than a foil and can provide sheathed electrical resistance heaters where it is too difficult to wind large diameter wires on a small arbor to form a coiled resistance element.</p> |
