| 摘要 |
PURPOSE:To improve efficiency of a heat exchanger and to prevent a noise from occurring, by making the titled device into constitution that a plurality of spiral cases is arranged at equi-spaced intervals, whose exhaust port is opened within an air duct so that the exhaust port faces against the heat exchanger at equi- spaced intervals, and about a half of the total number of impellers is connected with each of two independent rotary shafts of electric motors respectively. CONSTITUTION:Air to be dischaged from an exhaust port 13 of a special case 8 can perform highly efficient heat exchange as it is distributed evenly within an air duct 9 and touched evenly to the whole of a heat exchanger 4. Highly precise assembling can be performed easily as a half of a plurality of impellers 7 is connected with each of rotary shafts 10a and 10b of electric motors 11a and 11b which are connected with each of support plates 5 and are independent respectively. Then, a noise can be reduced as air pressure in the air duct 9 becomes evny and a lengthy rotary shaft is not employed. |
