| 摘要 |
PURPOSE:To prevent a poor combustion caused by the clogging in a combustion surface by a method wherein a zero governer arranged in fuel gas supplying passage is controlled in response to a static pressure in the combustion air passage. CONSTITUTION:Combustion gas supplying passage 11 is connected to a passage 6 for supplying gas to a combustion surface 4, a zero governer 12 is arranged in the supplying passage 11, and there is provided a communication passage 13 for applying the static pressure found between a fan 8 and an orifice 9 to the zero governer 12 so as to adjust a degree of opening of the zero governer. With this arrangement, even if any cloggings are produced in the porous body for forming the combustion surface 4, a mixing ratio between the air and the fuel may always be kept at a constant value under a cooperative relation between the throttling action of the orifice 9 and the adjusting operation of the zero governer 12, resulting in that no back fire and no incomplete combustion etc. may be occurred and a superior and positive surface combustion may be kept for a long period of time. |
