| 摘要 |
PURPOSE:To set a material to be heated to a desired temperature by detecting the temperature of a material to be heated by a heat sensitive element, and transmitting the movement of an operational point of the heat sensitive element to a valve thereby to control the flow rate of a gas. CONSTITUTION:When the temperature of a material to be heated 20 gradually rises up, the position of the operational point 2 of a temperature detector 1 moves toward the direction indicated by A, and connection means 3 pushed by the operational point 2 revolves in the direction C and assumes a position 3a. Further, a valve spindle 8 connected by connection means 3 moves in the direction E, a valve 11a moves in the direction H, and the position of the valve 11a rapidly approaches a through port 24. Thus, an interval 12 between the through port 24 and the valve 11a is narrowed. By this movement, the flow of a gas from a primary chamber 26 to a secondary chamber 25 is limited, and a flame 19 is diminished, the quantity of heat received by a material to be heated 20 is reduced. When the quantity of heat discharged from the material to be heated 20 becomes equal to the quantity of heat received thereby, the rise in the temperature of the material to be heated is stopped and also the change of the operational point 2 is stopped. Therefore, the temperature of the material to be heated 20 is maintained at a predetermined value. |
