Heat pipe

Abstract

A heat pipe including an outer pipe, a composite capillary structure and an inner pipe. The outer pipe includes a vaporization section, a condensation section and a transmission section. The vaporization section and the condensation section are connected to two opposite sides of the transmission section. The outer pipe has an accommodating chamber. The accommodating chamber extends from the vaporization section to the condensation section. The composite capillary structure is located in the accommodating chamber of the outer pipe. The inner pipe is located in the accommodating chamber in the transmission section. The inner pipe divides the accommodating chamber in the transmission section into an inner channel and an outer channel. The inner channel and the outer channel are in fluid communication with the accommodating chamber in the vaporization section and the condensation section. The composite capillary structure is partially located in the outer channel.

What is claimed is: 
     
         1 . A heat pipe, comprising:
 an outer pipe, comprising a vaporization section, a condensation section and a transmission section, wherein the vaporization section and the condensation section are connected to two opposite sides of the transmission section, the outer pipe has an accommodating chamber, and the accommodating chamber extends from the vaporization section to the condensation section;   a composite capillary structure, located in the accommodating chamber of the outer pipe, wherein the composite capillary structure comprises a first capillary structure and a second capillary structure, the first capillary structure is stacked on the second capillary structure, the second capillary structure is stacked on the outer pipe, and the first capillary structure is at least disposed in the vaporization section of the outer pipe; and   at least one inner pipe, located in a portion of the accommodating chamber in the transmission section, wherein the at least one inner pipe divides the portion of the accommodating chamber in the transmission section into at least one inner channel and at least one outer channel, the at least one inner channel and the at least one outer channel are in fluid communication with other portions of the accommodating chamber in the vaporization section and the condensation section, and the composite capillary structure is partially located in the at least one outer channel.   
     
     
         2 . The heat pipe according to  claim 1 , wherein the first capillary structure is a metal mesh, a sintered powder structure or a sintered ceramic structure. 
     
     
         3 . The heat pipe according to  claim 2 , wherein the second capillary structure is a microgroove, a metal mesh, a sintered powder structure or a sintered ceramic structure. 
     
     
         4 . The heat pipe according to  claim 1 , wherein a thickness of the portion of the composite capillary structure in the vaporization section is different from a thickness of the portion of the composite capillary structure in the condensation section. 
     
     
         5 . The heat pipe according to  claim 1 , wherein a capillary force of the portion of the composite capillary structure in the vaporization section is greater than a capillary force of the portion of the composite capillary structure in the condensation section. 
     
     
         6 . The heat pipe according to  claim 1 , wherein a porosity of the portion of the composite capillary structure in the vaporization section is less than a porosity of the portion of the composite capillary structure in the condensation section. 
     
     
         7 . The heat pipe according to  claim 1 , wherein the at least one inner pipe has a plurality of through holes, and the at least one inner channel is in fluid communication with the at least one outer channel through the plurality of through holes. 
     
     
         8 . The heat pipe according to  claim 1 , wherein the heat pipe comprises two inner pipes, diameters of the two inner pipes are equal to each other, and the two inner pipes are arranged side by side. 
     
     
         9 . The heat pipe according to  claim 1 , wherein the heat pipe comprises three inner pipes, diameters of the three inner pipes are equal to each other, and the three inner pipes are in contact with one another. 
     
     
         10 . The heat pipe according to  claim 1 , wherein the at least one inner pipe comprises a first pipe, two second pipes and a third pipe, a diameter of the first pipe is greater than diameters of the two second pipes, the diameters of the two second pipes are greater than a diameter of the third pipe, and the two second pipes are located between the first pipe and the third pipe. 
     
     
         11 . The heat pipe according to  claim 1 , wherein the at least one inner pipe is offset from a center of the portion of the accommodating chamber in the transmission section. 
     
     
         12 . The heat pipe according to  claim 1 , wherein a percentage of a ratio of a cross-sectional area of the at least one inner pipe to a cross-sectional area of the outer pipe is greater than or equal to 30%. 
     
     
         13 . The heat pipe according to  claim 1 , wherein a length of the at least one inner pipe is less than or equal to a length of the transmission section. 
     
     
         14 . The heat pipe according to  claim 1 , wherein a length of the at least one inner pipe is less than or equal to a sum of a length of the transmission section and a predetermined length, and the predetermined length is 5 millimeters (mm) to 15 mm.