| 摘要 |
<p>PURPOSE:To form a safety device, quick in response and sure in operation, by a method wherein the temperature rise of a ceramic heater itself, as an instantaneous heating means, is detected to suppress the temperature rise of the ceramic heater. CONSTITUTION:The ceramic heater 12, as the instantaneous heating means, is consisting of a ceramic heating element A5, in which a heating resistor A1 and a detecting resistor A2 are pinched between a ceramic sheet A3 and a ceramic base A4 and are fomed integrally, thereafter, they are calcined. The temperature rise of the ceramic heater 12 itself is detected by employing the detecting resistor A2 and an electric input into the ceramic heater 12 is restricted so that the temperature of the ceramic heater 12 is not increased to a temperature higher than some temperature determined by the flow condition of the fluid to be heated. In this case, if the temperature of the detecting resistor A2, obtaining a temperature near the surface temperature of the ceramic heater 12, is controlled so as to become lower than a set temperature, the upper limit of the discharging hot-water temperature may be restricted even when the flow amount or the like of the hot-water is fluctuated. Accordingly, an abnormal input inputted in the order of 1.1-1.5 times with respect to a specified input may be detected and restricted.</p> |
