Fan and fan housing thereof having flapper
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[0028]With reference to FIGS. 5 and 7 showing the second embodiment of a fan 3 according to the present invention. The fan 3 includes a motor base 22, an impeller with a plurality of blades 41 (not shown), a motor (not shown) and a fan housing 21. The fan 3 can be an axial-flow fan or a centrifugal fan. The fan 3 is similar to fan 2 as above described except that each of the flappers 321 is pivotally connected to a corner of the fan housing 21 via the connecting element 322, and the shape of the flappers 321 corresponds to the shape of the opening 2111 without covering the motor base 22 when the fan 3 malfunctions or stops. The flapper 321 is connected to a corner of the fan housing 21 by the way of, for example but not limited to, pivoting, locking, clipping or wedging.
[0029]The flapper 321 can be also connected to the nearby fixing aperture 316 at the four corners of the fan housing 21. The fan housing 21 further comprises a cylindrical portion 213 and an outwardly expanding porti...
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