Heat pipe

Abstract

A heat pipe is provided. The heat pipe includes a body, a first capillary structure, and a second capillary structure. The body has a hollow structure. The first capillary structure is disposed inside the body, extends in an axial direction of the body, and has a 3D structure. The second capillary structure surrounds the first capillary structure, is attached to a pipe wall of the body, and has a 2D structure. The first and second capillary structures are bonded together outside the body, and then they are disposed inside the hollow structure. The second capillary structure has an opening, from which the first capillary structure is exposed. The exposed portion of the first capillary structure is in contact with the pipe wall.

What is claimed is: 
     
         1 . A heat pipe, comprising:
 a body having a hollow structure;   a first capillary structure, disposed inside the body, extending in an axial direction of the body, and having a 3D structure; and   a second capillary structure, surrounding the first capillary structure, attached to a pipe wall of the body, and having a 2D structure;   wherein the first and second capillary structures are bonded together outside the body, and then disposed inside the hollow structure;   wherein the second capillary structure has an opening, from which the first capillary structure is exposed, and the exposed portion of the first capillary structure is in contact with the pipe wall.   
     
     
         2 . The heat pipe as claimed in  claim 1 , wherein the length of the second capillary structure extending along the pipe wall is three quarters of the circumference of a cross-section of the body in a direction that is perpendicular to the axial direction. 
     
     
         3 . The heat pipe as claimed in  claim 1 , wherein the body includes one evaporating section and two condensing sections, wherein the evaporating section is located between the two condensing sections, and the evaporating section corresponds to one or more heat sources outside the heat pipe. 
     
     
         4 . The heat pipe as claimed in  claim 3 , wherein the first capillary structure is located at the evaporating section and the two condensing sections, and the second capillary structure is located only at the evaporating section. 
     
     
         5 . The heat pipe as claimed in  claim 4 , wherein the portions of the first capillary structure that are located at the two condensing sections only contact the pipe wall on one side. 
     
     
         6 . The heat pipe as claimed in  claim 5 , wherein the two condensing sections, the first capillary structure, and the second capillary structure are all symmetrical to a centerline of the evaporating section. 
     
     
         7 . The heat pipe as claimed in  claim 3 , wherein a length of the opening of the second capillary structure in the axial direction corresponds to a length of the one or more heat sources. 
     
     
         8 . The heat pipe as claimed in  claim 7 , wherein a width of the opening of the second capillary structure in a direction perpendicular to the axial direction is greater than a diameter of the first capillary structure. 
     
     
         9 . The heat pipe as claimed in  claim 1 , wherein the second capillary structure further comprises a supporting portion that is disposed at the middle portion of the opening, dividing the opening into a first opening and a second opening. 
     
     
         10 . The heat pipe as claimed in  claim 9 , wherein the lengths of the first and second openings in the axial direction are different, respectively corresponding to lengths of a plurality of heat sources outside the heat pipe.