Patent ID: 7337829
Filing Date: 2008-03-04
Classification: F28D,H01L

Abstract:
1. A cooling unit comprising: a heat receiving unit that receives heat from a body radiating heat; a radiator disposed at a distance from the heat receiving unit and radiating recovered heat; a liquid coolant transporting heat generated at the heat receiving unit to the radiator; and two distinct hollow tubes disposed so that the liquid coolant circulates between the heat receiving unit and the radiator, each of the hollow tubes forming a separate fluid path between the heat receiving unit and the radiator, the liquid coolant in one tube flowing from the heat receiving unit to the radiator, and the liquid coolant in the other tube flowing from the radiator to the heat receiving unit, a circulating flow of the liquid coolant formed by an elevating force of air bubbles generated from the heat received at the heat receiving unit, the radiator having an air pocket forming one part of the circulation path of the liquid coolant together with the hollow tubes and capable of collecting the air bubbles, wherein the heat receiving unit includes a heat sink forming one part of the circulation path of the liquid coolant together with the hollow tubes and the radiator and having a cross-sectional area larger than a cross-sectional area of each hollow tube so as to be capable of collecting a predetermined amount of the liquid coolant so that a portion of the collected liquid coolant turns into air bubbles and flows into one of the hollow tubes and causes liquid coolant to flow with the air bubbles, wherein said circulating flow of liquid coolant may flow in either of two directions, said flow direction being determined by which direction offers the least internal resistance, and wherein said two hollow tubes connecting the heat sink and the radiator are connected at positions of the same height so that the coolant can flow in either of the two directions.