Patent ID: 7487824

Claim:
A liquid cooling device comprising: a base enclosing working fluid therein and adapted for absorbing heat from a heat-generating electronic component; a heat sink adapted for dissipating the heat generated by the heat-generating electronic component having closed top and bottom ends which are closed via first and second covering plates attached thereto, and comprising an outer tube and an inner tube disposed in the outer tube, wherein first and second receiving chambers are respectively formed in the inner tube and between an inner surface of the outer tube and an outer surface of the inner tube for receiving the working fluid therein, the first receiving chamber communicating with the second receiving chamber at an end thereof so that the working fluid can flow from the first receiving chamber to the second receiving chamber; and a pump driving the working fluid to circulate between the base and the heat sink, wherein when the pump operates, the working fluid flows from the base to the first receiving chamber, then the second receiving chamber and finally back to the base; wherein the outer tube comprises a main body, a plurality of inner fins extending from the main body into the second receiving chamber, and a plurality of outer fins extending from the main body into a surrounding environment; and wherein the inner tube comprises a plurality of inner fins extending into the first receiving chamber, and a plurality of outer fins extending into the second receiving chamber.