Heat sink with columnar heat dissipating structure

Abstract

A heat sink includes a base and a heat dissipating structure composed of columnar heat dissipating units integrally formed on the base. Air stream gaps communicating with the dissipating units, each having opposite first and second sides, are formed. The first side is an arced surface structure, and the second side has a flow-guide projection. Furthermore, the dissipating units facing the same direction are arranged in an array. Alternatively, first sides of the outermost layer of the dissipating units face directions away from the inner layer of the dissipating units, and the corresponding directions of the first sides of the dissipating units from the outer to inner layers gradually deflect. The air streams flowing in various directions have the higher possibility of entering the dissipating structure and are dispersed. Thus, the time and possibility for the air to contact the dissipating units are increased, and the dissipation efficiency is increased.

1 . A heat sink, comprising:
 a base; and   a heat dissipating structure comprising a plurality of heat dissipating units being integrally formed with the base and standing on the base, wherein:   the heat dissipating units are columnar, an air stream gap is formed between the neighboring heat dissipating units and the air stream gaps communicate with one another; and   the heat dissipating unit has a first side and a second side, the first side is an arced surface structure, and the second side is disposed opposite the first side.   
     
     
         2 . The heat sink according to  claim 1 , wherein the heat dissipating units of the heat dissipating structure are arranged in an array, and the first sides of the heat dissipating units face the same direction. 
     
     
         3 . The heat sink according to  claim 1 , wherein the heat dissipating units of the heat dissipating structure are arranged in an N-layer phalanx comprising an outermost layer defined as a first layer, and an innermost layer defined as an N th  layer, and the first sides of the first layer of the heat dissipating units in various facing directions face directions away from the N th  layer of the heat dissipating units. 
     
     
         4 . The heat sink according to  claim 3 , wherein the first sides of the heat dissipating units from the first layer to the N th  layer gradually deflect to change corresponding directions of the first sides of the heat dissipating units. 
     
     
         5 . The heat sink according to  claim 4 , wherein facing directions of the first sides of the first layer of the heat dissipating units of the heat dissipating structure in the same facing direction differ from facing directions of the first sides of the N th  layer of the heat dissipating units by 90 degrees. 
     
     
         6 . The heat sink according to  claim 1 , wherein a bottom of the second side of the heat dissipating unit has a flow-guide projection having two opposite convex flow-guide surfaces connected together. 
     
     
         7 . The heat sink according to  claim 1 , wherein two flow-guide inclined surfaces are formed between the first side and the second side of the heat dissipating unit, and the flow-guide inclined surface connects the first side to the second side. 
     
     
         8 . The heat sink according to  claim 1 , wherein the base is an upper lamp shell of a LED road lamp.