| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving its heat exchanging efficiency while making the entire structure simple and compact. <P>SOLUTION: This heat exchanger A1 wherein a coil-shaped tube body portion 40 having a plurality of loop portions 40a is mounted in a can body 2, and a combustion gas introduced into a spatial portion 3 surrounded by the coil-shaped tube body portion 40 or generated in the spatial portion 3 is moved to a combustion gas passage 32 through a clearance 31 of the coil-shaped tube body portion 40, includes at least one additional coil-shaped tube body portion 40 different from the coil-shaped tube body portion 40 in diameter or width of each loop portion 40a, and comprises a tube body lap winding structural portion SC where the plurality of coil-shaped tube body portions are lap wound in a state that the plurality of loop portions 40a are arranged in the axial direction of the can body 2 and in the direction crossing the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT |
