| 摘要 |
<p>Panel for electric heating formed of an outer hermetic aluminium shell comprising an inner shell with a rectangular base and a cover, inside which is an ohmic resistance in the shape of a planar serpentine, formed of a series of U-bends and having two pseudo-circular endings that extend to the inside of a hermetic contact module integrated with the outer shell. The serpentine is made of a rigid bar of stainless AISI 304 steel having a rectangular section, constant width and thickness, and a width-to-thickness ratio of less than 3. Two sheets of mica in contact with the inner shell and with the cover, one on each face of the serpentine, insulate it from the outer shell and minimize the free internal spaces. The base of the inner shell incorporates a thick layer of oxide, black in colour, formed by hard anodizing, favouring infrared irradiation. An internal thermal insulator hinders the flow of heat towards the cover. The contact model includes two brass columns with widened circular bases, connected by screws in the base to the feed wiring and to the endings of the serpentine. A probe measures the temperature in contact with the serpentine.</p> |
