Patent ID: 8245765

Claim:
A heat dissipation device for dissipating heat from a heat-generating electronic element, the heat dissipation device comprising: a canister filled with a phase-changeable working fluid and adapted for receiving heat from the heat-generating electronic component; a housing hermetically fixed to a top of the canister and communicating with the canister; a fan located above a top of the housing, comprising a roller having an opening facing the housing and a plurality of blades extending outwardly from a circumference of the roller; and an impeller comprising a driving member received in the housing and an axle extending through a centre of the driving member, with a lower end extending downwardly through a bottom of the housing to a centre of the top of the canister and an upper end extending upwardly through a top of the housing to engage the fan; wherein the impeller further comprises a rotor mounted on the axle, the rotor is received in the roller of the fan and has a plurality of vertical anti-slip tapes projecting outwardly from a circumference thereof, the anti-slip tapes of the rotor engage an inner sidewall of the roller, a top of the rotor engages a top of the roller, and the fan is rotated by the impeller via the rotor; and wherein when the working fluid is heated by the heat-generating electronic element and vaporized to move into the housing, the driving member is impelled to rotate by the vaporized working fluid and correspondingly rotates the fan synchronously.