| 摘要 |
PURPOSE:To prevent heating medium stagnating in one pipe from being overheated when the heating medium in one pipe stops circulating, by closely arranging two kinds of pipes which are respectively contacted to the walls of a combustion chamber, which composes passages for combustion gas, with the straight-lined part of each pipe forming the shape of a teardrop. CONSTITUTION:A pipe 21 for feed hot-water and a pipe 22 for air for heating rooms, being made in the shape of a teardrop respectively, are reversely combined with each other to form an oblong circle when their straight-lined parts are contacted to each other. Each pair of pipes 21 and 22 are inserted into the hole of a fain 4 which is punched to fit on the pair of pipes 21 and 22. The pipe 21 is located on the upstream side of the direction of flow of combustion gas. On the other hand, the straight-lined parts between both ends of each pipe 21a and 22a are contacted to each other in the same manner as the pair of pipes 21 and 22 being inserted into the hole of a fin 4. The pipe 21a for feed hot-water is contacted to the wall 3 of a combustion chamber with its straight-lined part, while the pipe 22a for air for heating rooms is contacted to the wall 3 with its wider end part of a teardrop shape. Because the straight-lined parts of each pair of pipes 21 and 22, and 21a and 22a are contacted to each other in such a manner as mentioned above, heat can be conducted well between each pair of pipes, so that the number of pipes in a heat exchanger can be decreased, as well as to prevent heating medium stagnating in pipes from being overheated. |
