| 摘要 |
PURPOSE:To contrive the reducing of burning noise of the titled device by a method wherein two discharging pipes from a burner are connected each other, and said pipes different in each length are arranged to invert the sound wave phases passing through each pipe at the connecting part of two discharging pipes. CONSTITUTION:A sound wave 14 passing through the inside of a discharging pipe 2 and a sound wave 15 passing through the inside of a discharging pipe 3 are collided at the connecting part 16 where two discharging pipes are connected. The two discharging pipes 2, 3 are formed to be different in length for inverting said two sound wave phases. Thereby, a pulse burner producing low burning noise can be obtained, and especially successive effect at low frequency sound range can be achieved. Further, the excellent burning characteristic can be maintained without disturbance of the flowing by providing, at said connecting part, the sound permeable wall 10 having the property which intercepts the flow of fluid and permeates only the sound. |
