Patent ID: 7729118

Claim:
A liquid cooling device, comprising: a casing having an outer wall, a bottom base attached to a bottom end of the outer wall and a top cover attached to a top end of the outer wall, the casing comprising a liquid inlet, a liquid outlet above the liquid inlet and a receiving space therein; an impeller rotatably mounted in the receiving space, wherein when the impeller rotates liquid is driven to flow into the receiving space via the liquid inlet and out of the receiving space via the liquid outlet, a magnet is attached to the impeller; a sealed chamber defined in the casing and isolated from the receiving space; a motor driving unit received in the sealed chamber and magnetically interacting with the magnet attached to the impeller to drive the impeller to rotate, the motor driving unit comprising a motor having a stator and a printed circuit board electrically connecting with the stator, a plurality of electronic components mounted on the printed circuit board; and a mask received in the casing and comprising a top plate and a cylindrical sidewall extending from an edge of the top plate, the cylindrical sidewall defining an aperture corresponding to the inlet; wherein the top cover covers the motor driving unit and contacts with the electronic components of the printed circuit board for dissipating heat generated by the electronic components when the motor driving unit is operated.