Heat pipe

Abstract

A heat pipe including a pipe body, a first capillary structure and a second capillary structure. The pipe body has an evaporation portion and a condensation portion. The condensation portion is connected to the evaporation portion. The first capillary structure is disposed in the evaporation portion. The second capillary structure is disposed in the condensation portion and is connected to an end of the condensation portion that is located away from the evaporation portion. The second capillary structure is not in direct contact with the first capillary structure.

What is claimed is: 
     
         1 . A heat pipe, comprising:
 a pipe body having an evaporation portion and a condensation portion that are arranged along an axial direction of the pipe body so that the evaporation portion is connected to the condensation portion, the condensation portion includes a condensation end wall, a condensation sidewall, and a first transition portion that connects the condensation end wall and the condensation sidewall;   a first wick that is disposed in the pipe body having an inner surface and that extends along the axial direction of the pipe body from the evaporation portion into the condensation portion, the first wick being spaced apart from the condensation end wall and partially disposed on the first transition portion;   at least a second wick that is disposed in the condensation portion and that extends along the axial direction of the pipe body from the condensation end wall towards the evaporation portion so that the second wick is alongside the first wick in the axial direction, but is not in direct contact therewith, the second wick is in direct contact with the condensation end wall; and   a third wick disposed in the evaporation portion, that extends along the inner surface of the first wick in the axial direction of the pipe body towards the condensation portion, but is not alongside the second wick in the axial direction.   
     
     
         2 . The heat pipe according to  claim 1 , wherein a first portion of the second wick is in contact with the first transition portion, the first portion of the second wick is facing away from the evaporation portion. 
     
     
         3 . The heat pipe according to  claim 1 , wherein the evaporation portion comprises an evaporation sidewall, an evaporation end wall, and a second transition portion, the evaporation sidewall is connected to the condensation sidewall of the condensation portion via the second transition portion, the evaporation end wall is located on a side of the evaporation sidewall that is facing away from the condensation portion, and the first wick is in direct contact with the evaporation sidewall and partially disposed on the second transition portion. 
     
     
         4 . The heat pipe according to  claim 1 , further comprising a third wick, wherein the third wick is stacked on the first wick and is not in direct contact with the second wick. 
     
     
         5 . The heat pipe according to  claim 1 , wherein the heat pipe comprises two second wicks and the two second wicks are spaced apart from each other. 
     
     
         6 . The heat pipe according to  claim 1 , wherein the heat pipe comprises two second wicks and the two second wicks are connected to each other. 
     
     
         7 . The heat pipe according to  claim 1 , wherein an extending direction of the evaporation portion is substantially perpendicular to an extension direction of the condensation portion so that a bent portion is formed between the evaporation portion and the condensation portion. 
     
     
         8 . The heat pipe according to  claim 7 , wherein an end of the second wick that is located close to the evaporation portion is located on an end of the bent portion. 
     
     
         9 . A heat pipe, comprising:
 a pipe body having an evaporation portion and a condensation portion that are arranged along an axial direction of the pipe body so that the evaporation portion is connected to the condensation portion, the pipe body having a sidewall, a first end wall located in the evaporation portion and a second end wall located in the condensation portion, the first end wall and the second end wall connect to respective ends of the sidewall;   a first wick disposed on the sidewall of pipe body within the evaporation portion;   a second wick disposed on the second end wall extending along the axial direction of the pipe body from the condensation end wall towards the evaporation portion without contacting with the first wick; and   a working fluid,   wherein a gap between the second wick and the sidewall allows the working fluid flow back to the evaporation portion.