HEATING BOILER

PROBLEM TO BE SOLVED: To improve a heat exchanging efficiency at a heating boiler provided with a hollow cylindrical heat exchanging boiler.SOLUTION: This invention comprises a burner 1 for igniting fuel; an inner cylinder 33 in which combustion heat from the burner 1 passes; an outer cylinder 34 arranged outside the inner cylinder 33; space 37 for receiving heat medium formed between the inner cylinder 33 and the outer cylinder 34; and a hollow cylindrical heat exchanging boiler 31 arranged in a vertical direction. A central hollow portion of the heat exchanging boiler 31 is red heated by combustion heat from the burner 1 to heat the heat exchanging boiler 31 from inside and at the same time there is provided a baffle 38 for guiding the combustion heat from the lower burner 1 to flow toward the inner wall side of the inner cylinder 33 of the heat exchanging boiler 31, the baffle being suspended down; and black coating 40 is applied over an entire circumference to form some fine irregularities 39 at the inner wall of the inner cylinder 33 of the heat exchanging boiler 31.SELECTED DRAWING: Figure 1 【課題】中空円筒状の熱交換缶体を備える暖房用ボイラにおいて、熱交換効率を向上させる。【解決手段】燃料を燃焼させるバーナ１と、前記バーナ１の燃焼熱が内側を通る内筒３３、および該内筒３３の外側に配置される外筒３４を有し、前記内筒３３と前記外筒３４との間に熱媒体を受容する空間３７が形成され、鉛直方向に設置される中空円筒状の熱交換缶体３１と、を備え、前記熱交換缶体３１の中央の中空部分には、バーナ１からの燃焼熱で赤熱して該熱交換缶体３１を内側から加熱すると共に、下方のバーナ１からの燃焼熱を熱交換缶体３１の内筒３３内壁側へ流れるように案内するバッフル３８を上方から垂下して備え、更に前記熱交換缶体３１の内筒３３内壁には、微細な凹凸３９が形成されるように黒色系の塗料４０を全周に塗布したものである。【選択図】図１