| 摘要 |
PURPOSE:To stabilize the burning at the time of ignition and to simplify the structure by providing a detecting device such as thermostat to realize a structure in which the amount of air for burning is increased as the temperature rises. CONSTITUTION:When the ignition occurs above flame holes 4 by the electrical discharge of an ignitor 12, the burning is started. The temperature at a thermostat 13 rises, and a damper 15 is expanded by a lever 14 to allow a large amount of aif to be drawn from air holes 3 by the blowing pressure of nozzle 1 and the drawing pressure of fan 9 to increase the primary air ratio. In this instance, the blowing intensity of the fan 9 is attained at the same speed from pre-purge to continued burning to on-and-off burning stage by means of a room temperature thermostat 10, which allows a simplified control. Further, a drawback that the variance in the blowing intensity is aggravated as the fan speed is reduced in the case of the fan speed control is eliminated. |
