Heat pipe

Abstract

A heat pipe comprises a first pipe and at least a second pipe. The first pipe includes an evaporator, a heat insulator and a condenser communicating with each other to define a hollow chamber. Two ends of first pipe along an axial direction of the heat pipe are sealed. The second pipe is disposed in the hollow chamber and includes an accommodating space and a first capillary structure disposed in one end of the accommodating space closer to the evaporator. The hollow chamber of the first pipe is mainly a channel for vapor, the second pipe is mainly a channel for working fluid, the vapor is driven by the vapor pressure difference to move in the first pipe and from the evaporator to the condenser, and the working fluid is driven by the vapor pressure difference to flow in the second pipe and from the condenser to the evaporator.

What is claimed is: 
     
         1 . A heat pipe, comprising:
 a first pipe including an evaporator, a heat insulator and a condenser which communicate with each other to define a hollow chamber, wherein two ends of the first pipe along an axial direction of the heat pipe are sealed; and   at least a second pipe disposed in the hollow chamber and including an accommodating space and a first capillary structure disposed in one end of the accommodating space closer to the evaporator;   wherein the hollow chamber of the first pipe is mainly a channel for vapor, the second pipe is mainly a channel for working fluid, the vapor is driven by the vapor pressure difference to move in the first pipe and from the evaporator to the condenser, and the working fluid is driven by the vapor pressure difference to flow in the second pipe and from the condenser to the evaporator.   
     
     
         2 . The heat pipe as recited in  claim 1 , wherein the second pipe is located in a part of the evaporator, a part of the condenser and the whole heat insulator. 
     
     
         3 . The heat pipe as recited in  claim 1 , wherein the second pipe is just located in a part of the condenser and the whole heat insulator. 
     
     
         4 . The heat pipe as recited in  claim 1 , wherein a section of the first pipe along a radial direction of the first pipe is a uniform section. 
     
     
         5 . The heat pipe as recited in  claim 1 , wherein the first capillary structure is made by metal sintering powder, fiber, mesh or their any combination. 
     
     
         6 . The heat pipe as recited in  claim 1 , wherein the first pipe further includes a second capillary structure disposed in the hollow chamber closer to the evaporator. 
     
     
         7 . The heat pipe as recited in  claim 6 , wherein the second capillary structure is made by metal sintering powder, fiber, mesh or their any combination. 
     
     
         8 . The heat pipe as recited in  claim 6 , wherein the first capillary structure and the second capillary structure connect to each other or overlap each other. 
     
     
         9 . The heat pipe as recited in  claim 6 , wherein the second capillary structure contacts a part of an inner wall of the first pipe located at the evaporator and/or a part of an outer wall of the second pipe located at the evaporator. 
     
     
         10 . The heat pipe as recited in  claim 6 , wherein the first capillary structure in the second pipe is extended to the outside of the second pipe, and when the heat pipe is flattened, the second capillary structure outside the second pipe entirely or partially covers the first capillary structure extended to the outside of the second pipe. 
     
     
         11 . The heat pipe as recited in  claim 1 , wherein the first capillary structure closer to the evaporator is filled in the second pipe. 
     
     
         12 . The heat pipe as recited in  claim 1 , wherein an inner wall of the first pipe contacts an outer wall of the second pipe. 
     
     
         13 . The heat pipe as recited in  claim 1 , further comprising:
 a plurality of second pipes disposed adjacent to each other in the first pipe.