US2013160976A1PendingUtilityA1

Heat pipe with composite wick structure

51
Assignee: Wu jia-hongPriority: Dec 27, 2011Filed: Oct 24, 2012Published: Jun 27, 2013
Est. expiryDec 27, 2031(~5.4 yrs left)· nominal 20-yr term from priority
Inventors:Jia-Hong WuNien-Tien Cheng
F28D 15/0233F28D 15/046
51
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Claims

Abstract

An exemplary heat pipe includes an elongated casing, a first wick structure, a second wick structure, and working medium filled in the casing. The heat pipe has an evaporating section and a condensing section. The first wick structure is located within an inner wall of the casing and defines a window at the evaporating section of the heat pipe. The first wick structure has a first pore size. The second wick structure is received in the window of the first wick structure. The second wick structure is in direct physical contact with the inner wall of the evaporating section of the casing and the first wick structure. The second wick structure has a second pore size smaller than the first pore size of the first wick structure. The working medium saturates the first wick structure and the second wick structure.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A heat pipe, comprising:
 an elongated casing having an evaporating section and a condensing section;   a first wick structure located within an inner wall of the casing, the first wick structure defining a window at the evaporating section of the heat pipe, the first wick structure having a first pore size;   a second wick structure received in the window of the first wick structure, the second wick structure being in direct physical contact with the inner wall of the evaporating section of the casing and the first wick structure, the second wick structure having a second pore size smaller than the first pore size of the first wick structure; and   working medium filled in the casing and saturating the first wick structure and the second wick structure.   
     
     
         2 . The heat pipe of  claim 1 , wherein the first wick structure is screen mesh and the second structure is sintered powder wick structure. 
     
     
         3 . The heat pipe of  claim 1 , wherein the heat pipe is a flat-type heat pipe, a width of the casing being larger than a height of the casing. 
     
     
         4 . The heat pipe of  claim 3 , wherein the height of the casing is not larger than 2 mm. 
     
     
         5 . The heat pipe of  claim 1 , wherein the first wick structure defines at least one additional window. 
     
     
         6 . The heat pipe of  claim 1 , wherein the window of the first wick structure is rectangular. 
     
     
         7 . The heat pipe of  claim 1 , wherein an area of the second wick structure is the same as an area of the window of the first wick structure. 
     
     
         8 . A heat pipe, comprising:
 an elongated casing having an evaporating section and a condensing section;   a composite wick structure comprising a screen mesh wick structure and a sintered powder wick structure located at an inner wall of the casing, the screen mesh defining a window at the evaporating section of the heat pipe, the sintered powder wick structure being received in the window of the screen mesh wick structure, the sintered powder wick structure being in direct physical contact with the inner wall of the evaporating section of the casing and the screen mesh wick structure, the sintered powder wick structure having a pore size smaller than a pore size of the screen mesh wick structure; and   working medium filled in the casing and saturating the screen mesh wick structure and the sintered powder wick structure.   
     
     
         9 . The heat pipe of  claim 8 , wherein the heat pipe is a flat-type heat pipe, a width of the casing being larger than a height of the casing. 
     
     
         10 . The heat pipe of  claim 9 , wherein the height of the casing is not larger than 2 mm. 
     
     
         11 . The heat pipe of  claim 8 , wherein the screen mesh wick structure defines at least one additional window. 
     
     
         12 . The heat pipe of  claim 8 , wherein the window of the screen mesh wick structure is rectangular. 
     
     
         13 . The heat pipe of  claim 8 , wherein an area of the sintered powder wick structure is the same as an area of the window of the screen mesh wick structure.

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