Patent ID: 7322792

Claim:
A cooling fan without returning flow comprising: a motor stator being a disk with a bearing sleeve extending from the center of the disk to receive and support a bearing and a coil being disposed to surround the bearing sleeve; a frame with an inlet side and an outlet having a hollow space and being joined to the stator at the inlet side with a support device; and a motor rotor being disposed at the inlet side to face the stator, having a channel shaped cross section with an open side and a closed side for receiving the bearing sleeve and the coil, and providing an inner circumferential wall surface for being attached to a ring shaped magnet; characterized in that an accommodating space is formed between the stator and the inlet side for receiving the rotor and a fan blade set with a plurality of fan blades is integrally joined to the closed side of the rotor laterally such that the fan blade set is disposed in the hollow space of the frame and both of the stator and the rotor are disposed outside the inlet side of the frame; whereby, when the fan runs, airflow is capable of moving outward smoothly via the outlet side without producing a stagnation zone at the outlet side for enhancing the effect of heat dissipation and attenuating sound level of noise.