Heat sink with thermally conductive cover

Abstract

A heat sink includes a base, two heat pipes, a fin assembly, and two thermally conductive cover. The heat pipes are thermally connected to the base. Each of the heat pipes includes a cylindrical body and an ineffective end portion distal from the base. The ineffective end portion is connected to the cylindrical body. A diameter of the ineffective end portion is smaller than that of the body. The fin assembly is thermally coupled to the two heat pipes. Each of the thermally conductive covers envelops the ineffective end portion and is in thermal contact with the ineffective end portion and the fin assembly.

1 . A heat sink, comprising:
 a base;   at least one heat pipe thermally connected to the base, the at least one heat pipe comprising a cylindrical body and an ineffective end portion distal from the base, the ineffective end portion connected to the cylindrical body, a diameter of the ineffective end portion being smaller than that of the body;   a fin assembly thermally coupled to the at least one heat pipe; and   at least one thermally conductive cover enveloping the ineffective end portion and in thermal contact with the ineffective end portion and the fin assembly.   
     
     
         2 . The heat sink of  claim 1 , wherein the fin assembly comprises a plurality of parallel fin, the fins defining a plurality of through holes for extension of the at least one heat pipe therethrough. 
     
     
         3 . The heat sink of  claim 1 , wherein the at least one heat pipe comprises two heat pipes, each of the heat pipes being U-shaped. 
     
     
         4 . The heat sink of  claim 3 , wherein the base comprises a first surface and an opposing second surface, the first surface configured for being in thermal contact with a heat source, two grooves being defined in the second surface and each configured for receiving the corresponding heat pipe. 
     
     
         5 . The heat sink of  claim 1 , further comprising a plurality of fasteners configured for securing the base. 
     
     
         6 . The heat sink of  claim 5 , wherein each of the fasteners comprises a bolt and a compression spring, the base defining a plurality of base through holes, the bolt extending through the compression spring and the base through hole, each compression spring compressed between the base and a cap of the corresponding bolt. 
     
     
         7 . The heat sink of  claim 2 , further comprising a plurality of supports each connected to a corresponding corner of the fin and the base. 
     
     
         8 . The heat sink of  claim 1 , wherein the thermally conductive cover is in thermal contact with an end face of the ineffective end portion. 
     
     
         9 . The heat sink of  claim 1 , wherein the thermally conductive cover is in thermal contact with an outer circumferential surface of the ineffective end portion.