Loop heat pipe

Abstract

A loop heat pipe for heat dissipating to a heat source including a first pipe, a first capillary structure, a second capillary structure, a second pipe, and a working fluid is provided. The first pipe has an evaporating portion adjacent to the heat source and a condensing portion. The first capillary structure is disposed on an inner surface of the first pipe and extends from the evaporating portion to the condensing portion. The second capillary structure is disposed on the inner surface and located within the evaporating portion. The second pipe is connected between the evaporating portion and the condensing portion. The working fluid disposed in the first pipe and the second pipe is capable of being transferred from the evaporating portion to the condensing portion via the second pipe, and is capable of being transferred from the condensing portion to the evaporating portion in the first.

1 . A loop heat pipe, suitable for heat dissipating to a heat source; the loop heat pipe comprising:
 a first pipe, having an evaporating portion and a condensing portion, wherein the evaporating portion is adjacent to the heat source;   a first capillary structure, disposed on an inner surface of the first pipe and extending from the evaporating portion to the condensing portion;   a second capillary structure, disposed on the inner surface and located in the evaporating portion;   a second pipe, connected between the evaporating portion and the condensing portion; and   a working fluid, disposed in the first pipe and the second pipe, wherein the working fluid is capable of being transferred from the evaporating portion to the condensing portion via the second pipe and is capable of being transferred from the condensing portion to the evaporating portion in the first pipe.   
   
   
       2 . The loop heat pipe according to  claim 1 , wherein the first capillary structure is a plurality of grooves formed on the inner surface, and the second capillary structure is a sintering structure. 
   
   
       3 . The loop heat pipe according to  claim 1 , wherein the first capillary structure and the second capillary structure are formed as an integrative sintering structure. 
   
   
       4 . The loop heat pipe according to  claim 1 , wherein the second capillary structure has an exhaust end and a reflux end, and the heat source and the second pipe are adjacent to the exhaust end. 
   
   
       5 . The loop heat pipe according to  claim 4 , wherein the exhaust end is an open end and the reflux end is a close end. 
   
   
       6 . The loop heat pipe according to  claim 4 , wherein the thickness of the exhaust end is less than the thickness of the reflux end.