| 摘要 |
PURPOSE:To prevent deformation and raise the durability in a burner case that forms a combustion chamber. CONSTITUTION:A burner case 36 is provided at the outer circumference of a burner head 24 to one end of which a carburetor 28 is connected. An outer circumferential wall 39 is provided which surrounds the outer circumference of the burner case 36 and the carburetor 28 through an air channel 38, and, further, a combustion fan 41 is provided near the carburetor 28 or on the side opposite to the carburetor 28. With this constitution the burner case 36 is cooled by a large volume of the primary air or secondary air during the combustion so that overheating and deformation due to the combustion heat are prevented. |
