A grooved tube

Abstract

The present disclosure presents a seamless grooved tube. The inner surface of the tube is grooved into a pattern, the pattern including at least one rib ( 1 ). At least a part of the at least one rib is roughened.

1 . A grooved tube, wherein the inner surface of the tube is grooved into a pattern, the pattern including at least one rib, wherein at least a part of the at least one rib is roughened. 
     
     
         2 . The grooved tube according to  claim 1 , wherein the grooved tube is seamless. 
     
     
         3 . The grooved tube according to  claim 1 , wherein the roughened part of the at least one rib comprises a plurality of recesses, the plurality of recesses are dimensioned such that the depths of the recesses range from 0.0001 mm to 0.01 mm and the sizes of the openings of the recesses at the plane of the bottom of the rib range from 0.0001 mm to 0.01 mm. 
     
     
         4 . The grooved tube according to  claim 3 , wherein the depths of the recesses are in the range of 0.001 mm to 0.005 mm and the sizes of the openings of the recesses at the plane of the bottom of the rib are in the range of 0.001 mm to 0.005 mm. 
     
     
         5 . The grooved tube according to  claim 1 , wherein the roughened part of the at least one rib comprises a plurality of protrusions, the plurality of protrusions are dimensioned such that heights of the protrusions range from 0.0001 mm to 0.01 mm and the sizes of the cross-sections at the bases of the protrusions range from 0.0001 to 0.01 mm. 
     
     
         6 . The grooved tube according to  claim 5 , wherein the heights of the protrusions are in the range of 0.001 mm to 0.005 mm and the sizes of the cross-sections at the bases of the protrusions are in the range of 0.001 mm to 0.005 mm. 
     
     
         7 . The grooved tube according to  claim 1 , wherein the at least one rib has a top, side surfaces, and a bottom, the top and the side surfaces of the at least one rib are smooth, and at least a portion of the bottom of the at least one rib is roughened. 
     
     
         8 . The grooved tube according to  claim 1 , wherein the tube is made of copper or copper alloy. 
     
     
         9 . The grooved tube according to  claim 1 , wherein the at least one rib is configured as a helix on the inner surface of the tube. 
     
     
         10 . The grooved tube according to  claim 3 , wherein the roughened part of the at least one rib is made by drawing the tube through a die, at least a part of the surface of the die being roughened so as to roughen the at least a part of the at least one rib during drawing. 
     
     
         11 . The grooved tube according to  claim 7 , wherein the roughened part of the at least one rib is made by sintering metal particles onto the part of the at least one rib to be roughened.