| 摘要 |
PURPOSE:To raise a heat efficiency by providing a first exhaust gas convergence means for collecting a combustion exhaust gas on a surface of the upstream side of a flow of the exhaust gas with respect to a water passing tube, and a second exhaust gas convergence means for exhausting the combustion exhaust gas from the first exhaust gas convergence means after collecting it at the downstream side surface of the exhaust gas flow with respect to the water passing tube. CONSTITUTION:As guide plates 5, 5 are each other made to be in a closely contact state, a combustion exhaust gas sent into a heat exchanging section 1b executes an inflow from an open section 51, contacts the upper face of a water passing tube 11 and executes an inflow among a guide plate 5, a water passing tube 11 and a fin 12. This combustion exhaust gas is exhausted from an open section 52 at the underside direction of the water passing tube 11, and contacts the underface of the water passing tube 11 at this time. Accordingly, a combustion gas is condensed, in a heat exchanging section 1b, by a contact action of the combustion exhaust gas over all circumferential periphery of the water passing tube 11 and the fin 12 and a heat efficiency is raised. A drain adhering to the upper section of an outside wall of the guide plate 5 enters the inside through a pierced hole 55 and flows downwards from the open section 52. |
