| 摘要 |
PURPOSE:To uniformalize air speed distribution and improve cooling efficiency and then facilitate modification of a shape by bending a tube in a multiple row lengthwise and increasing the fin pitch of the tube row as it is separated from a cleaning fan. CONSTITUTION:A tube 10 is bent and arranged in a multiple row lengthwise and is arranged in a hood lock space F by varying the height dimension and being separated from the space F. Besides, the pitch of the waveform fin 11A of a tube row separated from a cleaning fan that is not illustrated is set higher than the pitch of the waveform fin 11B of the tube row near the fan. Furthermore, each of the fins 11A and 11B has the same pitch in the same row. As a result of this structure, air speed distribution becomes flat and cooling efficiency is improved, and since the fin pitch in each row is the same, assembly and manufacturing are facilitated. |
