| CPC F04D 25/0693 (2013.01) [F04D 25/08 (2013.01); H02K 5/10 (2013.01); H02K 5/225 (2013.01); H02K 7/14 (2013.01); F04D 19/002 (2013.01)] | 7 Claims |
|
1. A cooling fan comprising:
a fan housing having an air outlet for discharging air, formed on a front surface thereof and an air inlet for introducing air, formed on a rear surface thereof;
a rotation shaft having a lower portion rotatably supported by the fan housing;
a rotor fixed to an upper portion of the rotation shaft;
a stator arranged inside the rotor with a predetermined gap with respect to the rotor;
an impeller connected to an outer periphery of the rotor and rotated together with the rotor; and
a protective net having a plurality of holes formed in the upper side thereof to block foreign materials from penetrating through the air outlet of the upper side of the impeller,
wherein the protection net further includes a plurality of ring-shaped coupling rings which extend downward from a side surface of an outermost concentric portion forming a plurality of holes, and the fan housing includes a plurality of coupling holes to which the coupling rings are coupled, and
wherein each of the coupling rings has a step structure in which an outer diameter decreases toward a lower end of the outer periphery thereof, each of the coupling holes has a step structure in which an inner diameter decreases from an upper portion thereof to a lower portion thereof, in correspondence to the step structure of the outer periphery of each of the coupling rings, and each coupling ring is press-fitted to an upper portion of each coupling hole.
|