Reinforced heat exchanger plate

1. A plate suitable for acting as a bulkhead between two fluids flowing in a plate heat exchanger, the plate possessing edges meeting at two corners and a diagonal joining the two corners, the plate possessing an outer periphery and comprising:

a plurality of corrugations each having a bottom crest line and a top crest line, all of the bottom crest lines and all of the top crest lines of the plate being parallel to one another;

at least some of the corrugations of the plate locally comprising stiffeners formed by a local reduction of the height of the top crest line from a first height of the top crest line;

the stiffeners being arranged in a first group of stiffeners distributed on the plate along at least one first line parallel to the diagonal of the plate, the diagonal being perpendicular to the crest lines of the corrugations;

the stiffeners of the first group being alternately arranged on either side of the first line on each consecutive corrugation;

the distance measured perpendicularly to the first line from the center of the stiffeners of the first group to the first line being the same for each stiffener of the first group; and

each of the corrugations that includes a stiffener arranged on one side of the first line at the perpendicular distance from the first line possessing a height equal to the first height on the other side of the first line at the perpendicular distance from the first line.

2. The plate according to claim 1 , wherein the distance between the center of each stiffener of the first group and the first line is equal to half a pitch of the corrugations.

3. The plate according to claim 1 , wherein the first line is arranged on the diagonal.

4. The plate according to claim 1 , wherein the stiffeners are arranged in a second group of stiffeners distributed on the plate along a second line parallel to the crest lines of the corrugations, the stiffeners of the second group being alternately arranged on either side of the second line on each consecutive corrugation, the distance measured perpendicularly to the second line between the center of the stiffeners of the second group and the second line being the same for each stiffener of the second group.

5. The plate according to claim 4 , wherein the second line is arranged symmetrically about the first line by a 90 degrees rotation about the center of the plate.

6. The plate according to claim 1 , wherein the stiffeners have a zero height above the bottom crest line.

7. The plate according to claim 1 , further comprising at least one third group of stiffeners alternately arranged on either side of a third line parallel to the first line.

8. The plate according to claim 7 , further comprising a fourth group of stiffeners arranged on either side of a fourth line and symmetrically about the third group by a 90 degrees rotation about the center of the plate.

9. The plate according to claim 7 , wherein distances measured perpendicularly between adjacent parallel lines of stiffeners are the same for each line.

10. The plate according to claim 8 , wherein distances measured perpendicularly between adjacent parallel lines of stiffeners are the same for each line.

11. The plate according to claim 1 , wherein the corrugations include corrugations of varying lengths.