Patent ID: 6466442
Filing Date: 2002-10-15
Classification: F28D,F28F,H01L

Abstract:
A heat dissipating means for cooling central processing unit comprising:a barrel having a bottom wall contiguous to and thermally conductive with a central processing unit (CPU), and having an end cover distal from said bottom wall for capping a side wall circumferentially formed on said bottom wall for confining a chamber among said bottom wall, said side wall and said end cover of said barrel; a plurality of fins formed on said barrel; a cooling fan contiguous to said fins and said barrel for driving a cooling air for cooling said barrel and said fins; a vaporizable coolant filled into said barrel as evacuated to form vacuum in said chamber; a guiding means provided in said chamber in said barrel for guiding vapor of the coolant as vaporized when absorbing heat from the CPU towards an inside wall of said barrel to be cooled and condensed as a liquid coolant; and a capillary means formed on the inside wall in said barrel for capillarily osmetically draining the liquid coolant as condensed on the inside wall of the barrel towards the bottom wall for automatically recirculatively completing liquid-vapor two phase change of the coolant for efficiently dissipating heat from the CPU; said guiding means including: a hood portion retained to the bottom wall of the barrel having a plurality of inlet holes formed in a bottom portion of the hood portion to drain a liquid coolant from the side wall into the hood portion through the inlet holes; and a nozzle tapered from the hood portion towards the end cover having a plurality of perforations formed in the nozzle for guiding vapor, which is vaporized from the liquid coolant in the hood portion when heated by heat transferred from CPU, towards the end cover and the side wall of the barrel to be cooled and condensed at the inside wall of the end cover and the side wall of the barrel.