Patent ID: 6857466

Claim:
A cooling apparatus comprising: a refrigerant tank defining an evaporating region for reserving a refrigerant to be boiled and vaporized by heat of a heating body; a radiator defining a condensing region for releasing heat of the refrigerant vaporized in said refrigerant tank to an external fluid; a first boiling area increasing means disposed in said evaporating region of said refrigerant tank, said first boiling area increasing means arranged at a lower side of said refrigerant tank for dividing an inside of said evaporating region of said refrigerant tank into a plurality of first vertically extending passages, and a second boiling area increasing means disposed in said evaporating region of said refrigerant tank, said second boiling area increasing means arranged at an upper side of said refrigerant tank for dividing the inside of said evaporating region of said refrigerant tank into a plurality of second vertically extending passages, wherein said second boiling area increasing means horizontally offsets from said first boiling area increasing means for allowing said first vertically extending passages to communicate with said second vertically extending passages, said refrigerant tank is substantially vertically arranged, and an average open area of said second vertically extending passages is larger than an average open area of said first vertically extending passages.