| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an engagement structure of a casing, achieving easy attachment/detachment when designing of a serial axial flow fan is changed or the combination of the axial flow fan is changed during operation. Ž<P>SOLUTION: A frame of the serial axial flow fan includes a first housing 23 and a second housing 33. A first axial locking mechanism and a first unlocking mechanism are provided at the lower end of the first housing, and a second axial locking mechanism and a second unlocking mechanism are provided at the upper end of the second housing. The axial locking mechanisms are locked against each other through their movement along the axial direction of the axial flow fan. The first and second unlocking mechanisms unlock the first and second housings with a twisting force equal to or greater than a predetermined value when the first and second housings are relatively twisted in a predetermined direction. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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