| 摘要 |
PURPOSE:To enable automatic control of a preheating time of a heating burner, by providing a pair of thermocouples on a control circuit of the heating burner which activates a catalyst. CONSTITUTION:A pair of thermocouples 9 and 11 are provided on a safety valve 5 of a heating burner 7 and a pair of thermocouples 8 and 10 are provided on the coil 12 of a main cock 2. When gas is supplied, the burner 7 is ignited and a whole area of a catalyst mat 4 is started to burn. Then, electromotive force is coccurred even on the thermocouples 8 and 9 with the lapse of time, the thermocouple 8 acts so as to increase electromotive force of the thermocouple 10 and the thermocouple 9 acts so as to decrease electromotive force of the thermocouple 11. With this a safety valve 5 is closed and a heating burner 7 is extinguished at last, on the one hand an open state of the main cook 2 is maintained as it is. |
