Heat dissipation apparatus having heat pipes inserted therein

Abstract

A heat dissipation apparatus includes a base, a heat sink on the base, two heat pipes thermally connecting the base and the heat sink and a fan mounted in the heat sink. The heat sink comprises a first fin group placed on the base and a second fin group located on the first fin group. Each heat pipe comprises an evaporation section connected to the base, a condensation section and an adiabatic section interconnecting the evaporation section and the condensation section. The condensation sections of the heat pipes are sandwiched between the first and second fin groups and surround the fan.

1 . A heat dissipation apparatus, comprising:
 a base;   a heat sink comprising a first fin group placed on the base and a second fin group located on the first fin group, each of the first and second fin groups having a circular configuration with a breached sector, the breached sectors being aligned with each other;   two heat pipes each comprising an evaporation section connected to the base, a condensation section and an adiabatic section interconnecting the evaporation section and the condensation section; and   a fan embedded in the heat sink;   wherein the condensation sections of the heat pipes are sandwiched between the first and second fin groups and surround the fan.   
   
   
       2 . The heat dissipation apparatus of  claim 1 , wherein the heat sink defines a concave space in a top thereof for receiving the fan therein. 
   
   
       3 . The heat dissipation apparatus of  claim 1 , wherein the condensation sections of the heat pipes curve away from each other from the adiabatic sections along a periphery direction of the heat sink and join each other at ends thereof distant from the adiabatic sections of the heat pipes to thereby form a circle surrounding the fan. 
   
   
       4 . The heat dissipation apparatus of  claim 1 , wherein the first fin group defines a concave part in a central part thereof for receiving the fan and an annular top face surrounding the fan. 
   
   
       5 . The heat dissipation apparatus of  claim 4 , wherein the first fin group defines a through hole in a center of a bottom the concave part for allowing airflow generated by the fan to flow downwardly therethrough and comprises a plurality of first fins extending outwardly from the through hole along a radial direction. 
   
   
       6 . The heat dissipation apparatus of  claim 5 , wherein the second fin group surrounding the fan is a ring-shaped and has an annular bottom face engaging the annular top face of the first fin group. 
   
   
       7 . The heat dissipation apparatus of  claim 6 , wherein two curving grooves are respectively defined in the annular top face of the first fin group and the annular bottom face of the second fin group, the condensation sections of the heat pipes being received in the grooves. 
   
   
       8 . The heat dissipation apparatus of  claim 7 , wherein the second fin group comprises a plurality of second fins arranged in a radial direction, the annular top face of the first fin group and the annular bottom face of the second fin group are formed by a plurality of flanges extending perpendicularly from upper ends of the first fins and lower ends of the second fins. 
   
   
       9 . The heat dissipation apparatus of  claim 1 , wherein the two adiabatic sections of the two heat pipes are received in the breached sectors. 
   
   
       10 . The heat dissipation apparatus of  claim 9 , wherein the breached sector of the second fin cooperates with the breached sector of the first fin group to form a breached sector of the heat sink. 
   
   
       11 . The heat dissipation apparatus of  claim 1 , further comprising a cover mounted on a top of the heat sink, a top of the fan being engaged with a bottom of the cover to suspend the fan inside the heat sink. 
   
   
       12 . The heat dissipation apparatus of  claim 11 , wherein the cover comprises an annular frame engaging with an periphery of the second fin group and a circular lattice window formed on a top of the frame and engaging the top of the fan. 
   
   
       13 . The heat dissipation apparatus of  claim 1 , wherein the base comprises a first base on which the heat sink is placed and a second plate attached to a bottom of the first plate, and the evaporation sections of the heat pipes are sandwiched between the first and second plates. 
   
   
       14 . A heat dissipation apparatus, comprising:
 a base;   a heat sink defining a concave space in a top thereof and comprising a first fin group placed on the base and a second fin group located on the first fin group and surrounding the concave space;   two heat pipes each comprising an evaporation section connected to the base, a condensation section sandwich between the first and second fin groups and an adiabatic section interconnecting the evaporation section and the condensation section; and   a fan received in the concave space of the heat sink and surrounded by the condensation sections of the heat pipes.   
   
   
       15 . The heat dissipation apparatus of  claim 14 , wherein the condensation sections of the heat pipes curve away from each other from the adiabatic sections of the heat pipes along a periphery direction of the heat sink and join each other at ends distant from the adiabatic sections of the heat pipes to thereby form a circle surrounding the fan. 
   
   
       16 . The heat dissipation apparatus of  claim 14 , wherein the first fin group defines an annular top face surrounding the fan. 
   
   
       17 . The heat dissipation apparatus of  claim 16 , wherein the second fin group surrounding the fan is a ring-shaped and has an annular bottom face engaged with the annular top face of the first fin group. 
   
   
       18 . The heat dissipation apparatus of  claim 17 , wherein two curving grooves are respectively defined in the annular top face of the first fin group and the annular bottom face of the second fin group and cooperate with each other to form a circular channel receiving the condensation sections of the heat pipes therein. 
   
   
       19 . The heat dissipation apparatus of  claim 14 , further comprising a lattice window covers a top of the second fin group and is connected to a top of the fan to suspend the fan in the concave space of the heat sink.