Patent ID: 8834135
Filing Date: 2014-09-16
Classification: F04D,G06F

Abstract:
1. A heat-dissipation fan comprising: a hollow cylinder body having a bottom plate, a ring wall disposed around the bottom plate and an accommodating space formed between the ring wall and the bottom plate; a fixing pillar having a fixing end and a free end, the fixing end is fixed at the bottom plate of the hollow cylinder body, and wherein the free end protrudes beyond a top surface of the ring wall of the hollow cylinder body and comprises a supporting surface; a stator installed at the ring wall; a fan wheel having a top plate, an outer ring wall, an inner ring wall, a penetration hole formed at the top plate, a ring-shaped magnet, a first accommodating slot formed between the outer ring wall and the top plate, and a second accommodating slot formed between the inner ring wall and the top plate, wherein the top plate comprises a bottom surface and a top surface, the outer ring wall and the inner ring wall are disposed at the bottom surface of the top plate, the inner ring wall is located within the first accommodating slot and surrounds the penetration hole, the hollow cylinder body and the stator are covered with the fan wheel, the inner ring wall is fitted into the accommodating space of the hollow cylinder body, the ring wall and the stator are located between the outer ring wall and the inner ring wall; a bearing disposed within the second accommodating slot, wherein said bearing comprises a coupling hole, the fixing pillar penetrates through the coupling hole and the penetration hole of the fan wheel, wherein the free end of the fixing pillar protrudes beyond the top surface of the top plate, and wherein the supporting surface and the top surface are spaced apart from each other by a first spacing; a bearing plate having an insertion hole, wherein the hollow cylinder body is fixed at the insertion hole; and a case, wherein the supporting surface of the free end and the case are spaced apart from each other by a second spacing, wherein the second spacing is smaller than the first spacing.