Patent ID: 7520315
Filing Date: 2009-04-21
Classification: F28D

Abstract:
1. A heat pipe comprising: a metal casing containing a working fluid therein, the casing comprising an evaporating section and a condensing section at an opposite end thereof, and a central section located between the evaporating section and the condensing section; and a capillary wick arranged at an inner surface of the casing; wherein a thickness of the capillary wick formed at the condensing section in a radial direction of the casing is smaller than that of the capillary wick formed in the central section of the casing; wherein the thickness of the capillary wick formed at the condensing section gradually decreases towards an extreme end of the metal casing remote from the evaporating section in a lengthwise direction of the casing; wherein the thickness of the capillary wick formed at the evaporating section gradually increases towards the condensing section in a lengthwise direction of the casing; and wherein an average thickness of the capillary wick formed at the evaporating section is greater than that of the capillary wick formed at the condensing section.