Corrugated fin and method for producing it
A corrugated fin, in particular for a heat exchanger, having a substantially corrugated design, having a plurality of fin surfaces, wherein adjoining fin surfaces are connected to one another by means of a fin arch in such a way that a medium can flow through an intermediate space between adjoining fin surfaces, wherein the fin surfaces are arranged at an angle with respect to one another perpendicularly with respect to a throughflow direction for the medium, wherein the fin surface has at least one bulge which protrudes out of the plane of the fin surface, wherein the extent of the bulge in a direction perpendicularly with respect to the air throughflow direction is smaller than the extent of the fin surface in said direction.
1. A corrugated fin for a heat exchanger with a substantially corrugated design, the corrugated fin comprising:
a plurality of fin surfaces, wherein adjacent fin surfaces are connected to one another via a fin arch such that a medium is adapted to flow through an intermediate space between adjacent fin surfaces, wherein the fin surfaces are arranged at an angle with respect to one another perpendicular to a throughflow direction for the medium; and
at least one bulge arranged on the fin surface, the at least one bulge protruding out of a plane of the fin surface, wherein an extent of the bulge in a direction perpendicular to the air throughflow direction is smaller than an extent of the fin surface in the direction,
wherein the bulge is formed as a corrugated embossing on one or on opposite fin surfaces,
wherein an arcuate embossing is provided on the fin surface, the arcuate embossing surrounding the corrugated embossing above and below, such that the arcuate embossing is provided above and below the corrugated embossing,
wherein, in the air throughflow direction, the arcuate embossing extends as a continuous band above and a continuous band below the corrugated embossing,
wherein, in the air throughflow direction, the arcuate embossing alternates between a first size arcuate embossing and a second size arcuate embossing, the first size arcuate embossing being larger than the second size arcuate embossing, and
wherein each of the first size arcuate embossing and the second size arcuate embossing have an arc shape, such that the first size arcuate embossing and the second size arcuate embossing of the continuous band extending above the corrugated embossing each create a convex curve in a direction towards the fin arch provided at an upper edge of the fin surface, and the first size arcuate embossing and the second size arcuate embossing of the continuous band extending below the corrugated embossing each create a convex curve in a direction towards the fin arch provided at a lower edge of the fin surface.
2. The corrugated fin according to claim 1 , wherein the bulge is spaced apart from an end region of the fin surface, which is adjacent to a fin arch, or from both end regions of the fin surface, said region each adjacent to a fin arch.
3. The corrugated fin according to claim 1 , wherein a plurality of bulges are formed and arranged per fin surface, and wherein a first portion of bulges of a fin surface protrude toward a first side and a second portion of bulges protrude toward a second side with respect to the plane of the fin surface.
4. The corrugated fin according to claim 3 , wherein the first and second portion of bulges touch one another or merge into one another.
5. The corrugated fin according to claim 1 , wherein the corrugated embossings on opposite fin surfaces are formed projecting in the same direction.
6. The corrugated fin according to claim 1 , wherein the corrugated embossing extends along the fin surface in the flow direction.
7. The corrugated fin according to claim 1 , wherein the corrugated embossing modulates the fin surface perpendicular to the flow direction.
8. The corrugated fin according to claim 1 , wherein the arcuate embossings form a band, running parallel to the corrugated embossing.
9. The corrugated fin according to claim 1 , wherein a bulge depth of the corrugated embossings and the arcuate embossings is formed constant or variable over the height of the fin.
10. The corrugated fin according to claim 1 , wherein a bulge out of a trapezoidal fin surface in a region of a trapezoid base is smaller than a bulge in a region of a trapezoid top.
11. The corrugated fin according to claim 1 , wherein a bulge into a trapezoidal fin surface in a region of a trapezoid base is larger than a bulge in a region of a trapezoid top.
12. The corrugated fin according to claim 1 , wherein a bulge height is between 60% and 95% of the fin height or wherein the bulge height is 80% of the fin height.
13. The corrugated fin according to claim 1 , wherein a counter-bulge is formed in at least one or in each trough or peak of the corrugated embossing.
14. A heat exchanger having fluid channels with side surfaces of the fluid channels, with spatial regions between adjacent side surfaces, wherein a corrugated fin according to claim 1 is arranged between adjacent side surfaces such that it lies against one of the side surfaces via opposite fin arches.
15. The corrugated fin according to claim 1 , wherein the arcuate embossing merges into the corrugated embossing.