| 摘要 |
PURPOSE:To operate a flapper valve smoothly without dividing an apparatus itself, by constituting the flapper valve, which opens and closes a plurality of feeding ports for feeding air for combustion by a plurality of divided pieces. CONSTITUTION:A flapper valve 9 is constituted by a plurality of ring shaped divided pieces 9a, 9b and 9c. The devided pieces 9a, 9b and 9c are arranged in a concentric pattern, At the time of combustion, the flapper valve 9 is opened and closed. Since the flapper valve 9 is constituted by a plurality of the divided pieces 9a, 9b and 9c, the weight of each of the divided pieces 9a, 9b and 9c is light. The divided pieces are operated smoothly following the pulse oscillation. Since the plurality of the divided pieces 9a, 9b and 9c are concentrically arranged, the gap between each of the divided pieces 9a, 9b and 9c becomes small, and the configuration is made compact. Even though the jetted air becomes a drifted state, the operation is uniform and the burning characteristics can be maintained excellently. |
