Patent ID: 7958796

Claim:
A screw-driven fan device comprising: a screw comprising a rolling groove on an external edge thereof, and an axial groove disposed with the rolling groove; a screw nut, disposed on the screw, comprising a linking portion located on one end thereof; a fan comprising a rotary axle with a hole formed thereon for the screw passing through and at least one blade surrounding the rotary axle, wherein the hole has a flange formed on an interior side thereof, and the flange is engaged with the axial groove such that when the screw rotates, the coordination of the flange and the axial groove causes the fan to rotate simultaneously with the screw; and a connecting unit having a space and one side mounted on the linking portion of the screw nut so that the screw nut is attached to the connecting unit; wherein the fan is placed in the space, wherein the fan and the screw nut move axially together.