Ultra-thin heat pipe and manufacturing method thereof

Abstract

An ultra-thin heat pipe and a manufacturing method thereof are provided. The ultra-thin heat pipe includes a flat pipe body and a powder-sintered portion. The flat pipe body has an internal wall, a first groove set and a second groove set, wherein the first groove set and the second groove set are disposed on the internal wall and spaced apart from each other, and each groove of the first groove set and the second groove set is extended along an extension direction of the flat pipe body. The powder-sintered portion is disposed within the flat pipe body and connects both the first groove set and the second groove set for forming at least one vapor channel with the internal wall.

1 . An ultra-thin heat pipe, comprising:
 a flat pipe body having an internal wall, a first groove set and a second groove set, wherein the first groove set and the second groove set are disposed on the internal wall and spaced apart from each other, and each groove of the first groove set and the second groove set is extended along an extension direction of the flat pipe body; and   a powder-sintered portion disposed within the flat pipe body, connecting both the first groove set and the second groove set for forming at least one vapor channel with the internal wall.   
     
     
         2 . The heat pipe according to  claim 1 , wherein the segments of the internal wall between the first groove set and the second groove set are smooth. 
     
     
         3 . The heat pipe according to  claim 2 , wherein the shape of the cross-section of the flat pipe body on at least one of the segments is semicircular. 
     
     
         4 . The heat pipe according to  claim 1 , wherein the first groove set is disposed on one planar surface of the internal wall. 
     
     
         5 . The heat pipe according to  claim 1 , wherein the first groove set is disposed on one curved surface of the internal wall. 
     
     
         6 . The heat pipe according to  claim 1 , wherein the grooves of the first groove set are spaced with the same interval. 
     
     
         7 . The heat pipe according to  claim 1 , wherein the powder-sintered portion comprises a plurality of powders sintered together, and the diameter of at least one of the powders is larger than the width of each groove. 
     
     
         8 . The heat pipe according to  claim 1 , wherein the powder-sintered portion comprises a plurality of powders sintered together and divided into a first sintered block and a second sintered block, the first sintered block connects the first groove set, and the second sintered block connects the second groove set. 
     
     
         9 . The heat pipe according to  claim 8 , wherein the first sintered block and the second sintered block are spaced apart from each other. 
     
     
         10 . The heat pipe according to  claim 8 , wherein the first sintered block aligns with the second sintered block. 
     
     
         11 . The heat pipe according to  claim 8 , wherein the first sintered block is disposed staggered with respect to the second sintered block. 
     
     
         12 . The heat pipe according to  claim 1 , wherein the thickness of the shell of the flat pipe body is about 0.3 millimeter (mm). 
     
     
         13 . The heat pipe according to  claim 1 , wherein the distance between any two adjacent grooves is less than 0.1 mm. 
     
     
         14 . The heat pipe according to  claim 1 , further comprising:
 a plurality of burnable lines disposed in the powder-sintered portion, wherein the burnable lines are removable by burning for increasing the number of holes of the powder-sintered portion.   
     
     
         15 . The heat pipe according to  claim 14 , wherein the material of the burnable lines is nylon or cotton. 
     
     
         16 . The heat pipe according to  claim 1 , further comprising:
 a working liquid partially filled in the flat pipe body.   
     
     
         17 . A manufacturing method of ultra-thin heat pipe, comprising:
 providing a pipe body having a first groove set and a second groove set on an internal wall of the pipe body;   cutting the pipe body for forming a cut pipe body with a first end and a second end opposite to the first end;   sealing the first end of the cut pipe body;   providing a plurality of to-be-sintered powders;   filling in the cut pipe body with the to-be-sintered powders;   sintering the powders within the cut pipe body for forming a powder-sintered portion connecting both the first groove set and the second groove set;   filling in the cut pipe body with a working liquid;   vacuuming the cut pipe body; and   sealing the second end of the cut pipe body.   
     
     
         18 . The method according to  claim 17 , further comprising:
 flattening the cut pipe body for forming a flat pipe body.   
     
     
         19 . The method according to  claim 17 , before the step of filling in the to-be-sintered powders, further comprising:
 inserting a stick into the cut pipe body, wherein the stick has two non-curved surfaces corresponding to the first groove set and a second groove set.   
     
     
         20 . The method according to  claim 19 , after the step of sintering the powders, further comprising:
 removing the stick out of the cut pipe body.   
     
     
         21 . The method according to  claim 17 , wherein the step of providing the pipe body comprises:
 providing an empty pipe material; and   using a mold pillar having a first tooth set and a second tooth set to groove the empty pipe material for forming the first groove set and the second groove set.   
     
     
         22 . The method according to  claim 21 , wherein an extension direction of each tooth of the first tooth set and the second tooth set is identical with an extension direction of each groove of the first groove set and the second groove set.