Heat sink

Abstract

An exemplary heat sink includes a base plate and a fin unit including a plurality of fins arranged on the base plate. One of the base plate and fin unit includes a protruding member, and the other one of the base plate and the fin unit defines a groove corresponding to the protruding member. The protruding member is interferingly fitted in the groove thereby connecting the fin unit and the base plate together.

1 . A heat sink, comprising:
 a base plate; and   a fin unit comprising a plurality of fins arranged on the base plate;   wherein one of the base plate and fin unit comprises a protruding member, the other one of the base plate and the fin unit defines a groove corresponding to the protruding member, and the protruding member is interferingly fitted in the groove thereby connecting the fin unit and the base plate together.   
     
     
         2 . The heat sink of  claim 1 , wherein the protruding member extends upwardly from one side surface of the base plate, each of the fins defines a cutout thereof, the cutouts of the fins cooperatively forming the groove. 
     
     
         3 . The heat sink of  claim 2 , wherein the protruding member has a substantially trapezoid cross section. 
     
     
         4 . The heat sink of  claim 2 , wherein the protruding member comprises a top face spaced from the side surface of the base plate and two lateral faces obliquely depending from the top face to connect the side surface of the base plate, the protruding member having a width increasing gradually from the side surface of base plate to the top face. 
     
     
         5 . The heat sink of  claim 4 , wherein an arced chamfer is formed between each of the lateral faces and the top face. 
     
     
         6 . The heat sink of  claim 2 , wherein each of the fins comprises a main body and a flange extending outward from an upper edge of the main body, the cutout being defined in a lower end of the main body, a hem extending along a periphery of the cutout angling outward from the main body, the hem being oriented along the same axis as the flange. 
     
     
         7 . The heat sink of  claim 6 , wherein a main central portion of the hem is parallel to the flange, and a length of the main central portion of the hem is less than a length of the flange. 
     
     
         8 . The heat sink of  claim 6 , wherein the hems of the fins contact an outer surface of the protruding member. 
     
     
         9 . The heat sink of  claim 1 , wherein the groove is defined in one side surface of the base plate, each of the fins comprising a protrusion thereof, the protrusions of the fins cooperatively forming the protruding member. 
     
     
         10 . The heat sink of  claim 9 , wherein a cross section defined by the groove of the base plate is substantially trapezoid shaped. 
     
     
         11 . The heat sink of  claim 9 , wherein each of the fins comprises a main body and a flange extending outward from an upper edge of the main body, the protrusion depending from a lower edge of the main body, a hem extending along a periphery of the protrusion angling outward from the main body, the hem being oriented along the same axis as the flange. 
     
     
         12 . The heat sink of  claim 11 , wherein a main central portion of the hem is parallel to the flange, and a length of the main central portion of the hem is less than a length of the flange. 
     
     
         13 . The heat sink of  claim 11 , wherein the hems of the fins abut an inner surface of the base plate in the groove. 
     
     
         14 . A heat sink, comprising:
 a base plate comprising a protruding member extending upward from a top surface thereof; and   a fin unit comprising a plurality of fins arranged on the base plate, each of the fins defining a cutout in a bottom thereof, each of the cutouts having the same shape as a cross section of the protruding member of the base plate and a size substantially the same as that of the cross section of the protruding member;   wherein the fins are attached to the base plate with the protruding member interference fitted in the cutouts such that the fin unit and the base plate are connected together.   
     
     
         15 . The heat sink of  claim 14 , wherein the protruding member comprises a top face spaced from the top surface of the base plate and two lateral faces obliquely depending from the top face to connect the side surface of the base plate, the protruding member having a width increasing gradually from the top surface of base plate to the top face. 
     
     
         16 . The heat sink of  claim 14 , wherein each of the fins comprises a main body and a flange extending outward from an upper edge of the main body, the cutout being defined in a lower end of the main body, a hem extending along a periphery of the cutout angling outward from the main body, the hem being oriented along the same axis as the flange. 
     
     
         17 . The heat sink of  claim 16 , wherein the cutouts of the fins cooperatively form a groove corresponding to the protruding member of the base plate. 
     
     
         18 . A heat sink, comprising:
 a base plate defining a groove recessed from a top surface thereof; and   a fin unit comprising a plurality of fins arranged on the base plate, each of the fins comprising a protrusion, the protrusion having the same shape as a cross section defined by the groove of the base plate and a size substantially the same as that of the cross section of the groove;   wherein the fins are attached to the base plate with the protrusions interference fitted in the groove such that the fin unit and the base plate are connected together.   
     
     
         19 . The heat sink of  claim 18 , wherein each of the fins comprises a main body and a flange extending outward from an upper edge of the main body, the protrusion depending from a lower edge of the main body, a hem extending along a periphery of the protrusion angling outward from the main body, the hem being oriented along the same axis as the flange. 
     
     
         20 . The heat sink of  claim 18 , wherein the protrusions of the fins cooperatively form a protruding member corresponding to the groove of the base plate.