| 摘要 |
PURPOSE:To exchange sufficiently heat through the whole range of the main plate and improve the efficiency thereof by the method wherein at one side of the main plate of the first fan, the fluid is sent from its center side to its outer periphery side, in addition, at the other side of this main plate the fluid is sent from the outer periphery side to the center side. CONSTITUTION:When the first and the second fans 2, 10 are rotated, by the use of the first fan 2 a heated air stream in a drum is sucked from a suction port 7 into a flowing path 5 through a passage of the arrow mark A and is sent to the outer periphery side, then it is delivered from a outlet 8 to return into the drum. Further in a passage 6, the hot air stream is sent from the center side to the outer periphery side, therefore, the pressure at a opening part between a plate terminal unit 14 and a boss unit 11 becomes negative. By the effect of this negative pressure, as indicated in the arrow mark B an open air with a low temperature is sucked from a suction port 17 and passing along a main plate 3 to the center side, subsequently the air is passed through the fan blade 13 and is delivered from a outlet port 18. With this flow movement process, the heated air and the open cold air are exchanged in heat through the main plate 3. Therefore, it is possible to obtain surely a temperature difference between the heated air and the open air at the respective sides of the center and the outer periphery, thereby, a sufficient heat exchanging performance is obtainable over the whole range of the main plate 3, which contributes to improvement of the heat exchanging efficiency.
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