Patent ID: 9234709
Filing Date: 2016-01-12
CPC Classification: B21C,B21H,B23P,F28F,Y10T

Claim Text:
1. A heat exchanger tube ( 1 ) with a tube axis (A), with a tube wall ( 2 ), with a tube outside ( 21 ) and with a tube inside ( 22 ), continuously running, axially parallel or helically circling inner ribs ( each inner rib ( a continuously extending groove ( the rib tip ( the elevations ( characterized in that the rib flanks ( 31 ) of the inner ribs ( 3 ) are raised in the radial direction on the contour line which is defined by the transitional edge of a rib flank ( 31 ) to the rib tip ( 32 ), in that protuberances ( 37 ) advancing out of the rib flank ( 31 ) in the radial direction are formed in this region and said protuberances ( 37 ) have side surfaces that are coplanar with a surface of the rib flank ( 31 ).