Patent ID: 7694721

Claim:
A liquid cooling device, comprising: a casing comprising a base adapted for being attached on a heat-generating electronic component for absorbing heat generated by the electronic component, an outer wall mounted on the base and a top cover mounted on the outer wall, a receiving space being enclosed by the casing, the outer wall forming an inlet and an outlet thereon both intercommunicating with the receiving space and adapted for connecting with a liquid source; a heat-absorbing member received in the receiving space and attached on the base for exchanging heat with liquid in the casing; an impeller rotatably mounted in the receiving space and above the heat-absorbing member, wherein when the impeller rotates the liquid is driven to flow into the liquid cooling device via the inlet and then flow through the heat-absorbing member and finally flow out of the liquid cooling device via the outlet, a magnet being attached to the impeller; and a motor driving unit received in the casing and interacting with the magnet for driving the impeller to rotate; wherein the heat-absorbing member consists of a plurality of annular flakes coaxially stacked together, a plurality of channels being defined between the flakes for providing passage for the liquid to flow through the heat-absorbing member; and wherein each of the annular flakes defines a through hole at a center thereof and comprises alternating first and second portions, each first portion defining an elongated aperture extending along a radial direction of the each flake, each second portion defining a pair of symmetrical elongated apertures extending along the radial direction and communicating with the through hole.