Heat transfer surface

Patent metadata

Field	Value
Publication number	US-11221185-B2
Application number	US-201916522072-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Jan 4, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A method for forming features in an exterior surface of a heat transfer tube includes forming a plurality of channels into the surface, where the channels are substantially parallel to one another and extend at a first angle to a longitudinal axis to the tube. A plurality of cuts are then made into the surface substantially parallel to one another and extend at a second angle to a longitudinal axis to the tube different from the first angle. Individual fin segments extend from the surface and are separated from one another by the channels and the cuts. The fin segments have a first channel-adjacent edge adjacent substantially parallel to the channel, a first cut-adjacent edge substantially parallel to the cut, and a corner formed by a second channel-adjacent edge and a second cut-adjacent edge. A tube formed using this method can be used as a condenser tube.

First claim

What is claimed is:

1. A method for forming features in an exterior surface of a heat transfer tube, the method comprising the steps of:
forming a plurality of channels into the surface, the channels being parallel to one another and extending at a first angle to a longitudinal axis of the tube; and
cutting a plurality of cuts into the surface, the cuts being parallel to one another and extending at a second angle to a longitudinal axis of the tube, the second angle being different from the first angle, the cutting step forming individual fin segments extending from the surface, the fin segments being separated from one another by the channels and the cuts;
wherein the fin segments comprise a first channel-adjacent edge parallel to the channel, a first cut-adjacent edge parallel to the cut, and a corner formed by a second channel-adjacent edge and a second cut-adjacent edge, the corner rising upward from a channel floor and partially extending into the channel.

2. The method of claim 1 , further comprising a step of compressing the fin segments with a roller, causing an edge of the fin segments to bend at least partially over the cuts.

3. The method of claim 2 , wherein the step of compressing the fin segments further causes an edge of the fin segments to extend at least partially over the channels.

4. The method of claim 1 , wherein the first angle is between 86 and 89.5 degrees.

5. The method of claim 1 , wherein the second angle is between 10 and 35 degrees.

6. The method of claim 1 , wherein the second angle is 15 degrees.

7. The method of claim 2 , wherein the step of compressing the fin segments results in a wider stem near the fin segment cuts.

8. The method of claim 2 , wherein the step of compressing the fin segments further forms a boiling pore formed between each fin segment edge, a stem of each fin segment, and the cut.

9. The method of claim 2 , wherein the first angle is between 86 and 89.5 degrees.

10. The method of claim 2 , wherein the second angle is between 10 and 35 degrees.

11. The method of claim 2 , wherein the second angle is 15 degrees.

Assignees

• Wieland Werke Ag

Inventors

• Gorgy Evraam

Classifications

• B21C37/205 Primary

  with annular guides · CPC title

• F28D21/00

  Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00 · CPC title

• F28F13/187 Primary

  especially adapted for evaporator surfaces or condenser surfaces, e.g. with nucleation sites · CPC title

• B21C37/207

  with helical guides · CPC title

• F28D2021/0064

  Vaporizers, e.g. evaporators · CPC title