Patent ID: 7445039
Filing Date: 2008-11-04
Classification: F28D

Abstract:
1. A heat pipe comprising: a casing having an inner wall therein and defining an evaporating section for receiving heat and a condensing section for releasing the heat; a working fluid received in the casing and evaporated into vapor in the evaporating section and condensed into liquid in the condensing section; a capillary wick received in the casing and extending in an axial direction of the casing, the capillary wick defining a liquid channel therein; a plurality of vapor passages defined by the capillary wick; and at least a tube arranged in at lease one of the plurality of vapor passages and attached to a surface of the capillary wick; wherein the at least one of the vapor passages is separated from the capillary wick by the at least a tube, the working fluid in vapor and liquid states respectively flowing along the vapor passages and the liquid channel from one end towards an opposing end of the casing in opposite directions; wherein the capillary wick comprises first capillary wicks provided in opposite ends of the casing and a second capillary wick interconnecting with the first capillary wicks; and wherein the first capillary wick at the evaporating section is attached to the inner wall of the casing and has an outer periphery with a gradually decreased thickness towards an adiabatic section of the casing disposed between the evaporating section and the condensing section of the casing.