| 摘要 |
PURPOSE:To prevent moisture condensation and corrosion in a hot-water boiler with an air supply fan by introducing part of the combustion air from the circumferential wall at the bottom section of the combustion chamber into the combustion chamber formed in the inner cylinder of a boiler body. CONSTITUTION:The fuel jetted out of a fuel jet nozzle 15 is mixed in the combustion chamber 12 with the combustion air sent from an air supply fan 17 and burns. The combustion gas makes heat exchange with the boiler water din the inner cylinder 3 of a hot water boiler and ascends and it is then discharged out of the boiler body from the connection 11. On the other hand the air jetted out of a bypass opening 22 is distributed on the whole circumference at the bottom face along the concave section 27 which is of inverted stair shape, and ascends through the gap 22 to enter the combustion chamber. With this constitution the combustion gas will not invade into the corner section 28 on the bottom face of the boiler body 1 and the moisture condensation can be avoided.
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