| 摘要 |
PURPOSE:To realize miniaturization and a high wind quantity, by arranging respectively an inner and outer air changeover mechanism on the upper wall surface of a scroll casing and a centrifugal fan motor at the bottom wall surface, and forming an auxiliary inner air take-in opening at a motor-fitting surface. CONSTITUTION:The drive motor 9 of a centrifugal fan 10 is provided at the bottom wall surface 7b of a scroll casing 7 and at the same time, an auxiliary inner air take-in opening 12 is formed at the bottom wall surface 7b. As a result, when inner and outer air changeover doors 5, 6 are in an inner air suction state, the auxiliary inner air take-in opening 12 is opened through the linkage of the 2nd door 13 provided on the motor-fitting side of the casing 7 and the take-in of an auxiliary wind (inner air) is done. Accordingly, making up for the lowering of the quantity of air can be realized, and also, an suction wind quantity allotment per one opening on an air take-in side against the quantity of discharge wind can be lowered, and the resistance of suction is decreased, and the efficiency of suction is improved. Thus, miniaturization and a high wind quantity are realized. |
