MANUFACTURING METHOD OF FIN TUBE TYPE HEAT EXCHANGER AND COMBUSTION DEVICE HAVING FIN TUBE HEAT EXCHANGER

PROBLEM TO BE SOLVED: To provide a manufacturing method of a fin tube type heat exchanger which can use a pipe expansion device for a long period of a life, and improves productivity, and a combustion chamber having the fin tube type heat exchanger.SOLUTION: A manufacturing method of a fin tube type heat exchanger (51) includes a pipe expansion process for inserting a pipe expansion device (100) into a heat transmission pipe (21) which is inserted into a pipe penetration hole (20) of a heat transmission fin (2), and expanding the heat transmission pipe (21). The pipe expansion process has a first process for bringing the pipe expansion device (100) into a pipe-expanded state by expanding the heat expansion pipe (21) to a pipe expansion direction in a state that the pipe expansion device is stopped within a prescribed pipe expansion-scheduled range (22) in the heat transmission pipe (21), and makes the pipe expansion-scheduled range (22) adhere to the pipe penetration hole (20), and a second process for releasing the expansion of the pipe expansion device (100) to the pipe expansion direction, and moving the pipe expansion device (100) to a succeeding pipe expansion-scheduled range (22) in the heat transmission pipe (21). The manufacturing method repeatedly and alternately performs the first process and the second process.SELECTED DRAWING: Figure 4 【課題】拡管装置を長寿命に使用でき、生産性を向上させるフィンチューブ式熱交換器の製造方法及びフィンチューブ式熱交換器を備える燃焼装置を提供する。【解決手段】フィンチューブ式熱交換器(51)の製造方法は、伝熱フィン(2)の管貫挿孔(20)に貫挿させた伝熱管(21)内に拡管装置(100)を挿入し伝熱管(21)を拡管する拡管工程を含む。拡管工程は、拡管装置(100)を伝熱管(21)内の所定の拡径予定範囲(22)に停止させた状態で伝熱管(21)の管径方向に拡大させて拡径状態にして拡径予定範囲(22)を管貫挿孔(20)と密着するように拡管させる第１工程と、拡管装置(100)の管径方向への拡大を解除し縮径状態で拡管装置(100)を伝熱管(21)内の次の拡径予定範囲(22)へ移動させる第２工程とを有し、前記第１工程と前記第２工程とを交互に繰り返し実行する。【選択図】図４