Method of making an internal grooved tube

Details Method of making an internal grooved tube Method of making an internal grooved tube

2005-07-05

2005-07-05

Duong, Tho V (Department: 3743)

Heat exchange

Tubular structure

With discrete heat transfer means

C165S133000, C029S890043, C072S077000, C072S283000

Reexamination Certificate

active

06913074

ABSTRACT:
A method of manufacturing an internal grooved tube according to the present invention includes the steps of inserting a grooved plug into a blank tube rotatably, and then pressing the blank tube against the outside surface of the grooved tube with several balls revolving both around the circumference of the blank tube and on its axis in location of the grooved plug inserted, while drawing out the blank tube longitudinally in one direction, wherein the number of balls is limited to 2 to 3. A lead angle θ of the grooves to the tube axis is preferably limited to 26 to 45 degrees.

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