| 摘要 |
<p>The element (1) has a longitudinal spiral carrier (2) made of a heat resistant, electrically insulating material and receiving a spiral heating wire (3). The heating wire is held outside on the carrier, and is enclosed by a cladding tube (4) e.g. mica tube and ceramic tube, which is made of a heat resistant material. The spiral heating wire and the cladding tube define an air duct (5). The spiral carrier has two spiral carrier shell parts extending symmetrically to a center axis of the heating element in a longitudinal direction of the spiral carrier, where the parts lie on one another.</p> |
