| 摘要 |
PURPOSE:To prevent a rapid deterioration of exhaust gas characteristics under low intensity combustion conditions or oxygen-deficient conditions by disposing certain flow controlling tubes inside an inner lame tube and disposing a flange which extends circumferentially outwardly from a flow controlling tube above a connecting hole which is open to a flow controlling zone. CONSTITUTION:A flow controlling tube 26 disposed inside an inner flame tube 6 extends upwardly from a level nearly corresponding to the top of the wick 1, and has its bottom in a flow controlling zone 22 formed across the inner flame tube 6. A connecting hole 23 is disposed in the lower middle part of the wall of a flow controlling tube 21, and a flange 24 divides the flow controlling zone 22 into the lower flow controlling zone 25 and upper flow controlling zone 26 immediately above the connecting hole 23. The flange 24 is formed by causing the flow controlling tube 21 to protrude circumferentially outwardly by applying the beading or flaring. In the presence of the flange 24 which divides the flow controlling zone into the upper and lower halves, combustion gas flowing into the flow controlling tube above the flame becomes gas in the advanced stage of combustion, thus preventing a large quantity of CO from being released. Further, enough amount of air can be supplied from the connecting hole into the combustion chamber to promote the combustion in the lower part of the combustion chamber.
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