| 摘要 |
PURPOSE:To eliminate back phenomenon on ignition and obtain certain ignition by arranging a back preventing element in the vicinity of the top end of an inner cylinder, in a safety device which stops gas feeding prior to the reduction of oxygen concentration and the formation of the state of oxygen deficiency. CONSTITUTION:After a flange 11 is contacted with the upper surface of the flange part 7 of an outer cylinder 3, an inner cylinder 2 is fastened by a nut 13 which screws on the screw part 12 of the inner cylinder 2. In the vicinity of a primary flame port 9, a thermocouple 16 is arranged through a fitting cylinder 8, and a back preventing rod 17 is arranged at the same height to the primary flame port 9 or a little in a mixing pipe. Thus, back phenomenon on ignition is prevented, and the lift in oxygen deficiency is facilitated by increasing the rate of flow, and certain ignition at proper timing can be obtained, and the characterisitics in oxygen deficiency can be improved. |
