| 摘要 |
PURPOSE:To protect a furnace from the lowering of pressure and obtain an oil heater capable of preventing an influence by outdoor wind by setting a circulating variable means for varying its circulating cross area at a chimney and making its circulating cross section smaller as the burning control is made smaller. CONSTITUTION:When a pulse motor 10 is driven, a valve 9 is rotated and its control is so effected that as the combustion becomes small, the circulating area of an exhaust pipe 8 is lessened. When the circulating area 8 of the exhaust pipe 8 is varied, the pressure resistance of exhaust of the exhaust pipe 8 is varied. In other words, since the less the circulating area is, the larger will be the pressure resistance of the exhaust, its wind pressure reversely becomes large even if the air quantity in the combustion chamber 7 is lessened when combustion is controlled to lessen. Therefore, the wind pressure of the combustion chamber 7 is not influenced by its strong wind and incomplete combustion is not produced even if there is strong wind outdoors. |
