Heat pipe and manufacturing method thereof

Abstract

A heat pipe includes a sealed hollow casing, a wick structure lining an inner surface of the casing and a working medium contained in an interior of the casing. The casing includes an elongated main body having an elongated opening extending axially in the main body and a transparent cover fixed onto the main body and sealing the opening of the main body. The wick structure is provided by only lining an inner surface of the main body of the casing.

1 . A heat pipe comprising:
 a sealed hollow casing comprising an elongated main body having an elongated opening extending axially in the main body and a transparent cover fixed onto the main body and sealing the opening of the main body;   a wick structure lining an inner surface of the main body of the casing; and   a working medium contained in an interior of the casing.   
     
     
         2 . The heat pipe as described in  claim 1 , wherein the transparent cover is made of glass or acryl. 
     
     
         3 . The heat pipe as described in  claim 1 , wherein a cross-section of the casing is “D” shaped. 
     
     
         4 . The heat pipe as described in  claim 1 , wherein a cross-section of the main body is “C” shaped, and the transparent cover is planar. 
     
     
         5 . The heat pipe as described in  claim 1 , wherein an outline of the opening has two linear portions extending axially and parallel to each other and two arced portions respectively connected between two opposite ends of the two linear portions. 
     
     
         6 . The heat pipe as described in  claim 1 , wherein a width of the opening is smaller than a diameter of the main body of the casing. 
     
     
         7 . A method of manufacturing a heat pipe, comprising:
 providing a rudimentary rounded hollow pipe body with a wick structure lining against an inner surface thereof;   cutting a part of the pipe body along an axial direction of the pipe body out of the pipe body, an opening being formed on a remaining part of the pipe body;   releasing residual stresses of the remaining part of the pipe body;   providing a transparent cover having a shape corresponding to the opening of the main body, and affixing the cover to the remaining part of the pipe body for sealing the opening, cooperatively the remaining part of the pipe body and the cover forming a casing;   injecting a working medium into the casing; and   vacuuming and hermetically sealing the casing.   
     
     
         8 . The heat pipe as described in  claim 7 , wherein the pipe body is made of copper or aluminum, and the transparent cover is made of glass or acryl. 
     
     
         9 . The heat pipe as described in  claim 7 , wherein the part has a cross-section smaller than a half cross-section of the pipe body. 
     
     
         10 . The heat pipe as described in  claim 7 , wherein the transparent cover is plate shaped. 
     
     
         11 . The heat pipe as described in  claim 10 , wherein a cross-section of the casing is “D” shaped.