| 摘要 |
PROBLEM TO BE SOLVED: To prevent the overheating of air containing steam in a duct and the overheating around an air feed port. SOLUTION: A circular cylindrical-pipe-shaped boiling duct 26 is arranged at the lower part of a mixing duct 24 where an air feed port 28A is provided at an upper-end part for mutually jointing, the ducts are jointed, and a boiling pot 22 is fixed at the lower part of the boiling duct 26. A motor 38 where a rotator 36 being used as a fan 40 is mounted is arranged on the right of the mixing duct 24, and a fan blade 36A is provided on the upper surface of the rotator 36. On the left of the boiling duct 26, an on-off valve 70 is provided, where the on-off valve 70 is opened by pressure for allowing the air of the fan 40 to blow into when the air feed part 28A is blocked. According to change in the input of the light of the light reception part of a photo sensor 96, the opening and closing of the on-off valve 70 is detected, and a power supply 92 of a heater 32 is turned on and off by a controlling device 94. |
