Method of manufacturing internally grooved tubes for heat exchangers
AssigneeAlcatel Kabel AG & Co.
InventorGerhard Ziemek
Life of this patent
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Abstract
In a method for producing internally grooved tubes for heat exchangers, a smooth metal tape is drawn from a circular supply, a rolling mill provides it with a number of grooves that are parallel to each other and run at an angle of 15.degree. to 45.degree. with respect to the lengthwise direction of the tape, the tape is continuously formed into a tube with a lengthwise slot, and the slot is welded. At least two groups of parallel grooves are rolled into the surface of the metal tape so that the grooves form a herringbone pattern.
Claims3
A method for producing internally grooved tubes for heat exchangers, the method comprising the steps of:
- (a) drawing a smooth metal tape from a circular supply;
- (b) forming at least two groups of parallel running grooves into the metal tape so that the grooves extend in the form of a herringbone pattern, the grooves in each group of grooves in the tape are parallel to each other and run at an angle of 15.degree. to 45.degree. with respect to a lengthwise center line of the tape;
- (c) forming the metal tape continuously into a tube with a lengthwise slot;
- and
- (d) welding the slot.
Dependencies are inferred from the claim text.