Method for manufacturing a plate-type heat pipe

Abstract

A method for manufacturing a plate-type heat pipe including providing a mold including a first cavity and a plurality of second cavities located above and communicating with the first cavity and depositing cores into the first cavity. First and second metal powder are injected into the mold by using a double-mode injection molder. The first metal powder securely adheres to the cores, and the second metal powder fills up the first and second cavities except the first metal powder located, thereby forming a green piece. The cores are removed from the green piece to define chambers in the green piece. The green piece is heated to obtain a sintered product with an outer wall, fins extending from the outer wall and a wick structure adhering inner surfaces of the outer wall.

1 . A method for manufacturing a plate-type heat pipe comprising:
 providing a mold comprising a first cavity and a plurality of second cavities located at a top of the first cavity and communicating with the first cavity;   depositing a plurality of cores into the first cavity of the mold;   filling a first metal powder and a second metal powder respectively into the first and second cavities of the mold in such a manner that the first metal powder covers the cores, and the second metal powder fills the first and second cavities except the first metal powder located, thereby forming a green piece;   removing the cores from the green piece to define a plurality of chambers therein;   sintering the green piece with the chambers defined therein to obtain a sintered workpiece, wherein the sintered workpiece has an outer wall and a plurality of fins extending upwardly from a top side of the outer wall;   vacuuming the chambers;   injecting a working fluid into the chambers via a port in the sintered workpiece; and   sealing the port of the sintered workpiece.   
   
   
       2 . The method for manufacturing a plate-type heat pipe as in  claim 1 , the first and second metal powder are filled in the mold by using a double-mode injection molder. 
   
   
       3 . The method for manufacturing a plate-type heat pipe as in  claim 1 , wherein each of the second cavities of the mold has one of following configurations: a cuboidal configuration, a cone-shaped configuration, a round rod-shaped configuration, a rectangular rod-shaped configuration, a rhombus rod-shaped configuration and a circular frustum-shaped configuration, and the second cavities are spaced from each other. 
   
   
       4 . The method for manufacturing a plate-type heat pipe as in  claim 3 , wherein each of the second cavities has a configuration of a rhombus rod-shaped configuration, the second cavities are arranged in a matrix having a plurality of rows and columns, a space between two neighboring second cavities of a same column is smaller than that between two neighboring second cavities of a same row. 
   
   
       5 . The method for manufacturing a plate-type heat pipe as in  claim 1 , wherein the second cavities of the mold are arranged in to a matrix. 
   
   
       6 . The method for manufacturing a plate-type heat pipe as in  claim 1 , wherein the first cavity of the mold is cuboidal. 
   
   
       7 . The method for manufacturing a plate-type heat pipe as in  claim 6 , wherein the cores disposed in the first cavity of the mold are spaced from each other. 
   
   
       8 . The method for manufacturing a plate-type heat pipe as in  claim 1 , wherein a particle size of the first metal powder is larger than that of the second metal powder. 
   
   
       9 . The method for manufacturing a plate-type heat pipe as in  claim 1 , wherein each of the cores is made of one of a polymer material and a waxy material. 
   
   
       10 . The method for manufacturing a plate-type heat pipe as in  claim 1 , wherein each of the cores is removed from the green piece by one of thermal cracking and chemical reaction. 
   
   
       11 . A plate-type heat pipe comprising:
 a hermetic outer wall;   a plurality of spaced fins extending upwardly from a top surface of the outer wall, wherein the outer wall and the fins are of a same metal and integrally formed as a single piece;   a wick structure contacting with inner surfaces of the outer wall;   at least a chamber defined in the wick structure; and   a working liquid received in the at least a chamber.   
   
   
       12 . The plate-type heat pipe as in  claim 11 , wherein a plurality of spaced supporting poles is formed by the wick structure and located between top and bottom ends of the outer wall. 
   
   
       13 . The plate-type heat pipe as in  claim 12 , wherein the supporting poles and the wick structure are porous. 
   
   
       14 . The plate-type heat pipe as in  claim 11 , wherein each of the fins has one of following configurations: a cuboidal configuration, a cone-shaped configuration, a round rod-shaped configuration, a rectangular rod-shaped configuration, a rhombus rod-shaped configuration and a circular frustum-shaped configuration, and the fins are spaced from each other. 
   
   
       15 . The plate-type heat pipe as in  claim 14 , wherein each of the fins has a configuration of a rhombus rod-shaped configuration, the fins are arranged in a matrix having a plurality of rows and columns, a space between two neighboring fins of a same column is smaller than that between two neighboring fins of a same row.