Flat tube and heat exchanger having a flat tube of said type

Patent metadata

Field	Value
Publication number	US-10267572-B2
Application number	US-201414584356-A
Country	US
Kind code	B2
Filing date	Dec 29, 2014
Priority date	Jun 29, 2012
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A flat tube, in particular for a heat exchanger, is provided that has an areal material strip with two mutually opposite first and second side walls which are connected to one another via third and fourth side walls, wherein the third side wall is formed by two sections of the material strip that are laid one against the other in double-layer form, wherein an internal fin is arranged in the interior of the flat tube, which fin, at the end sides, bears against the third side wall and against the fourth side wall, and which fin, between the third side wall and the fourth side wall, is supported alternately against the first side wall and against the second side wall.

First claim

What is claimed is:

1. A flat tube for a heat exchanger, the flat tube comprising:
a flat material strip having two mutually opposing first and second side walls that are connected to one another via third and fourth side walls, the third side wall being formed by two sections of the material strip that are positioned one against the other in a double-layer; and
an internal fin arranged in an interior of the flat tube, the internal fin at the end sides is positioned against the third side wall and against the fourth side wall, and the internal fin, between the third side wall and the fourth side wall, is supported alternately against the first side wall and against the second side wall,
wherein the internal fin at one end region is curved or angled and is positioned against the third side wall and at the other end region is curved or angled and is positioned against the fourth side wall,
wherein the third side wall is formed with an inner material strip that extends from the first side wall and an outer material strip that extends from the second side wall, the inner material strip being positioned between the outer material strip and the one end region of the internal fin,
wherein, in a transition region from the first side wall to the inner material strip of the third side wall, an arc, step, or incline is provided on the inner material strip, and wherein the outer material strip is positioned against the inner material strip and a distal end of the outer material strip terminates in a region of the arc, step, or incline of the inner material strip, the distal end of the outer material strip being tapered to fit the contour of the inner material strip in the region of the arc, step or incline to form a flush closure,
wherein the one end region of the internal fin has a first portion having a same contour as the inner material strip of the third side wall and has a second portion having an arc, step or incline that has a same contour as the arc, step or incline of the transition region from the first side wall to the inner material strip, and
wherein an entirety of the arc, step or incline of the second portion of the internal fin is positioned against and directly contacts the arc, step or incline of the transition region between the first side wall and the inner material strip of the third side wall.

2. The flat tube according to claim 1 , wherein the third side wall has an angled or curved contour.

3. The flat tube according to claim 1 , wherein the fourth side wall has an angled or curved contour.

4. The flat tube according to claim 1 , wherein one end region of the internal fin is accommodated between two sections of the material strip that form the third side wall and that are positioned against one another in a double layer.

5. The flat tube according to claim 1 , wherein the flat tube has a tube width between 9 mm and 60 mm, and/or a tube height between 1.5 mm and 30 mm, and/or a wall thickness for the material strip between 160 μm and 500 μm, and a wall thickness for the inner fin between 60 and 200 μm.

6. The flat tube according to claim 1 , wherein, prior to insertion into the material strip, dimensions of the inner fin are smaller than or equal to the inner dimensions of the material strip such that the inner fin is inserted without pre-stress into the material strip.

7. A heat exchanger with a tube fin block having a plurality of flat tubes that are arranged between collecting spaces and are in fluid communication therewith, wherein corrugated fins are arranged between the flat tubes of the tube fin block, and wherein at least one of the flat tubes is a flat tube according to claim 1 .

8. The flat tube according to claim 1 , wherein the one end region of the internal fin is curved and the third side wall has a curved contour, such that the curved one end region of the internal fin is positioned against the curved contour of the third side wall, and wherein the other end region of the internal fin is curved and the fourth side wall has a curved contour, such that the curved other end region of the internal fin is positioned against the curved contour of the fourth side wall.

Assignees

• Mahle Int Gmbh

Inventors

• Kaestle Christoph
• Marx Steffen

Classifications

• F28D1/0391 Primary

  a single plate being bent to form one or more conduits · CPC title

• F28F3/025

  the means being corrugated, plate-like elements · CPC title

• F28F1/12 Primary

  the means being only outside the tubular element · CPC title

• F28F1/42 Primary

  the means being both outside and inside the tubular element · CPC title