Heat pipe

Abstract

A heat pipe includes a casing having an inner wall. A plurality of protrusions are radially formed on the inner wall of the casing. The plurality of protrusions are spaced from each other and extend longitudinally from one end of the casing to the other end of the casing. A main groove is defined between every two adjacent protrusions. The protrusions each define a plurality of first auxiliary grooves and a plurality of second auxiliary grooves being alternatively arranged with respect to each other along a longitudinal direction of the casing. The first auxiliary and the second auxiliary grooves each communicate two adjacent main grooves. The first auxiliary grooves each are inclined at an angle with respect to a longitudinal axis of the casing, and the second auxiliary grooves each are inclined at another different angle with respect to the longitudinal axis of the casing.

1 . A heat pipe comprising:
 a casing having an inner wall;   a plurality of protrusions radially formed on the inner wall of the casing, the plurality of protrusions being spaced from each other and extending longitudinally from one end of the casing to another end of the casing, a main groove being defined between every two adjacent protrusions, the protrusions each defining a plurality of first auxiliary grooves and a plurality of second auxiliary grooves therein, the first auxiliary grooves and the second auxiliary grooves in each of the protrusions being alternately arranged with respect to each other along a longitudinal direction of the casing, each of the first auxiliary grooves and the second auxiliary grooves communicating a main groove with an adjacent main groove, the first auxiliary grooves each being inclined at an angle with respect to a longitudinal axis of the casing, the second auxiliary grooves each being inclined at another different angle with respect to the longitudinal axis of the casing.   
     
     
         2 . The heat pipe as claimed in  claim 1 , wherein the first auxiliary grooves and the second auxiliary grooves are inclinedly extended to two oppositely different directions along the longitudinal axis of the casing from the one end of the casing to the another end of the casing. 
     
     
         3 . The heat pipe as claimed in  claim 1 , wherein the angle of the first auxiliary grooves is smaller than 90 degrees, and the another different angle of the second auxiliary grooves is larger than 90 degrees. 
     
     
         4 . The heat pipe as claimed in  claim 1 , wherein the angle of the first auxiliary grooves is complementary to the another different angle of the second auxiliary grooves. 
     
     
         5 . The heat pipe as claimed in  claim 1 , wherein each of the first auxiliary grooves and the second auxiliary grooves has a greater depth than the main groove. 
     
     
         6 . A heat pipe comprising:
 a casing having an inner wall;   a plurality of protrusions formed on the inner wall of the casing, the plurality of protrusions being spaced from each other and extending longitudinally through two opposite ends of the casing, a main groove being defined between two adjacent protrusions, a plurality of first annular auxiliary channels and a plurality of second annular auxiliary channels being defined in the plurality of protrusions, the first annular auxiliary channels and the second annular auxiliary channels being alternately arranged with respect to each other along a longitudinal direction of the casing, each of the first annular auxiliary channels comprising a plurality of first auxiliary grooves being circumferentially defined in the plurality of protrusions, each of the second annular auxiliary channels comprising a plurality of second auxiliary grooves being circumferentially defined in the plurality of protrusions, the first auxiliary grooves each being inclined at an angle with respect to a longitudinal axis of the casing, the second auxiliary grooves each being inclined at another different angle with respect to the longitudinal axis of the casing.   
     
     
         7 . The heat pipe as claimed in  claim 6 , wherein the first auxiliary grooves and the second auxiliary grooves are inclinedly extended to two oppositely different directions along the longitudinal direction of the casing. 
     
     
         8 . The heat pipe as claimed in  claim 6 , wherein the angle of the first auxiliary grooves is smaller than 90 degrees, the another different angle of the second auxiliary grooves is larger than 90 degrees. 
     
     
         9 . The heat pipe as claimed in  claim 6 , wherein the angle of the first auxiliary grooves is complementary to the another different angle of the second auxiliary grooves. 
     
     
         10 . The heat pipe as claimed in  claim 6 , wherein each of the first auxiliary and second auxiliary grooves has a greater depth than the main groove.