| 摘要 |
PURPOSE:To average the output of heat of conical cylindrical exothermic bodies, by changing the thicknesses of the electrical resistance materials of the heating bodies continuously or stepwise from the end surfaces of larger hole diameter to the end surfaces of smaller hole diameter of the heating bodies. CONSTITUTION:The thicknesses of exothermic bodies 28, 29 become larger continuously or stepwise from the end surfaces 28a, 29a of larger hole diameter to the end surfaces 28b, 29b of smaller hole diameters. The electrical resistance is inversely proportional to the thickness, i.e. the cross-sectional area of the conductor and is proportional to the hole diameter. As the joule heat is propor tional to I<2>R, the calorific value becomes small with decrease in the hole diame ter. Overheat of the parts close to the end surfaces with the smaller hole diameters of exothermic bodies 28, 29 where overheating tends to occur can be thereby avoided and no shortage of the total summed calorific value occurs.
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