Heat pipe

Abstract

A heat pipe ( 10 ) includes a hollow metal casing ( 110 ). The casing has an evaporating section ( 120 ) and a condensing section ( 160 ) at opposing ends thereof, and an adiabatic section ( 140 ) located between the evaporating section and the condensing section. A capillary wick structure ( 130 ) is arranged at an inner surface of the hollow metal casing. A vapor channel ( 150 ) is defined along an axial direction of the heat pipe and surrounded by the capillary wick structure. The vapor channel includes a nozzle ( 154 ) defined at a boundary between the evaporating section and the adiabatic section, wherein the nozzle has a cross section which gradually reduces towards the condensing section.

1 . A heat pipe comprising:
 a hollow metal casing having an evaporating section and a condensing section at respective opposite ends thereof, and an adiabatic section located between the evaporating section and the condensing section, the evaporating section being for receiving heat and the condensing section being for releasing the heat;   a capillary wick structure arranged at an inner surface of the hollow metal casing; and   a vapor channel defined along an axial direction of the heat pipe and surrounded by the capillary wick structure, the vapor channel including a nozzle defined at a boundary between the evaporating section and the adiabatic section, wherein the nozzle has a cross section which gradually reduces towards the condensing section.   
   
   
       2 . The heat pipe of  claim 1 , wherein the vapor channel further comprises a diffusing channel extending from a minimum end of the nozzle to a boundary between the adiabatic section and the condensing section, the diffusing channel has a cross section which gradually increases towards the condensing section. 
   
   
       3 . The heat pipe of  claim 2 , wherein the vapor channel further comprises a pair of straight channels, one of the straight channels is located at the evaporating section and the other of the straight channels is located at the condensing section. 
   
   
       4 . The heat pipe of  claim 3 , wherein thickness of the capillary wick structure corresponding to the pair of straight channels is uniform and of the same thickness as the straight channels. 
   
   
       5 . The heat pipe of  claim 2 , wherein thickness of the capillary wick structure of the evaporating section is larger than that of the condensing section. 
   
   
       6 . The heat pipe of  claim 2 , wherein thickness of the capillary wick structure of the condensing section is larger than that of the evaporating section. 
   
   
       7 . The heat pipe of  claim 1 , wherein a tube is attached to the inner surface of the capillary wick structure to form a vapor-liquid isolation structure. 
   
   
       8 . The heat pipe of  claim 1 , wherein the tube extends from the nozzle to the condensing section. 
   
   
       9 . A heat pipe comprising:
 a hollow metal casing having an evaporating section and a condensing section at respective opposite ends thereof, and an adiabatic section located between the evaporating section and the condensing section, the evaporating section being for receiving heat and the condensing section being for releasing the heat;   a capillary wick structure arranged at an inner surface of the hollow metal casing; and   a vapor channel defined along an axial direction of the heat pipe and surrounded by the capillary wick structure, the vapor channel including a nozzle having a cross section and a diffusing channel having a cross section, wherein the cross section of the nozzle gradually reduces towards the condensing section and the cross section of the diffusing channel gradually increases towards the condensing section, the nozzle being located between the evaporating section and the diffusing channel.   
   
   
       10 . The heat pipe of  claim 9  wherein the diffusing channel is defined at a boundary between the evaporating section and the adiabatic section. 
   
   
       11 . The heat pipe of  claim 10 , wherein diffusing channel extends from a minimum end of the nozzle to a boundary between the adiabatic section and the condensing section. 
   
   
       12 . The heat pipe of  claim 9 , wherein the vapor channel further comprises a pair of straight channels, one of the straight channels is located at the evaporating section and the other of the straight channels is located at the condensing section. 
   
   
       13 . The heat pipe of  claim 12 , wherein thickness of the capillary wick structure corresponding to the pair of straight channels is uniform and of the same thickness as the straight channels. 
   
   
       14 . The heat pipe of  claim 12 , wherein thickness of the capillary wick structure of the evaporating section is larger than that of the condensing section. 
   
   
       15 . The heat pipe of  claim 12 , wherein thickness of the capillary wick structure of the condensing section is larger than that of the evaporating section. 
   
   
       16 . The heat pipe of  claim 9 , wherein a tube is attached to the inner surface of the capillary wick structure to form a vapor-liquid isolation structure. 
   
   
       17 . The heat pipe of  claim 16 , wherein the tube extends from the nozzle to the condensing section.