Heat exchanger plate

Abstract

A heat exchanger plate (1) is described comprising an edge (2), a groove (3) running along the edge (2), and a corrugated area (4) having tops (5) and valleys (6) between the groove (3) and the edge (2), wherein the tops (5) run substantially perpendicular to the edge (2) and the groove (3) comprises an external wall (7) adjacent to the corrugated area (4) and an internal wall (8). Using such a heat exchanger plate (1) it should be possible to produce a reliable plate-type heat exchanger of simple construction. To this end the external wall (7) is in form of a wavy shape.

Claims

1. A heat exchanger comprising: an upper heat exchange plate positioned above a lower heat exchanger plate, each heat exchanger plate having: an edge extending in a first direction, a groove running in the first direction, the groove comprising an external wall and an internal wall, and an edge area extending between the external wall of the groove and the edge, wherein the external wall is in the form of a wavy shape having crests and troughs, and wherein when the upper heat exchanger plate is arranged above the lower heat exchanger plate, the crests of the external wall of the upper heat exchanger plate are offset in the first direction from the crests of the external wall of the lower heat exchanger plate.

2. The heat exchanger according to claim 1, wherein the edge area is a corrugated area having tops and valleys extending between the external wall of the groove and the edge, and wherein the crests are closer to the edge than the troughs and wherein at least in a middle section of the edge there is an equal number of crests and of tops.

3. The heat exchanger according to claim 2, wherein the crests are arranged in a region of the tops.

4. The heat exchanger according to claim 3, wherein the crests extend at least to an internal border of the corrugated area.

5. The heat exchanger according to claim 1, wherein the groove comprises a varying width.

6. The heat exchanger according to claim 1, wherein the internal wall is straight at least over a part of a length of the internal wall.

7. The heat exchanger according to claim 1, wherein the internal wall is not straight at least over a part of a length of the internal wall.

8. The heat exchanger according to claim 1, wherein the crests and troughs are rounded.

9. The heat exchanger according to claim 8, wherein the crests and troughs are in the form of a sinusoidal wave.

10. The heat exchanger according to claim 8, wherein the crests and troughs are squared.

11. The heat exchanger according to claim 4, wherein the groove comprises a varying width.

12. The heat exchanger according to claim 2, wherein the internal wall is straight at least over a part of a length of the internal wall.

13. The heat exchanger according to claim 3, wherein the internal wall is straight at least over a part of a length of the internal wall.

14. The heat exchanger according to claim 4, wherein the internal wall is straight at least over a part of a length of the internal wall.

15. The heat exchanger according to claim 5, wherein the internal wall is straight at least over a part of a length of the internal wall.

16. The heat exchanger according to claim 2, wherein the internal wall is not straight at least over a part of a length of the internal wall.

17. The heat exchanger according to claim 3, wherein the internal wall is not straight at least over a part of a length of the internal wall.

18. The heat exchanger according to claim 4, wherein the internal wall is not straight at least over a part of a length of the internal wall.

19. The heat exchanger according to claim 5, wherein the internal wall is not straight at least over a part of a length of the internal wall.

20. The heat exchanger according to claim 2, wherein the valleys of the upper heat exchanger plate are arranged above the tops of the lower heat exchanger plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) An embodiment of the invention will now be described in more detail with reference to the drawing, wherein:

(2) FIG. 1 shows a perspective view of an edge section of a heat exchanger plate,

(3) FIG. 2 shows a top view of the edge section of the heat exchanger plate according to FIG. 1,

(4) FIG. 3 shows a perspective view of edge sections of two heat exchanger plates during assembling,

(5) FIG. 4 schematically illustrates a relation between a corrugated area at the edge and the wave shape of the external wall,

(6) FIG. 5a schematically shows the relation of the crests and tops of the assembly of two heat exchanger plates 1a, 1b of a second embodiment according to FIG. 4,

(7) FIG. 5b shows sectional views along the lines A-A and B-B of FIG. 5a,

(8) FIG. 6a schematically shows a top view of a third embodiment according to FIG. 4, and

(9) FIG. 6b shows sectional views along lines A-A and B-B of FIG. 6a.

DETAILED DESCRIPTION

(10) In all Figures the same elements are denoted with the same reference numerals.

(11) FIG. 1 shows in a perspective view an edge section of a heat exchanger plate 1 comprising an edge 2, a groove 3 running parallel to the edge 2, and a corrugated area 4 having tops 5 and valleys 6 between the groove 3 and the edge 2.

(12) The tops 5 run substantially perpendicular to the edge 2. The groove 3 comprises an external wall 7 adjacent to the corrugated area 4 and an internal wall 8 on the opposite side of the external wall 7.

(13) The external wall 7 is in form of a wavy shape, i.e. it is ondulated. The external wall 7 comprises crests 9 and troughs 10. The crests 9 are closer to the edge 2 than the troughs 10.

(14) At least in a middle section of the edge 2 the number of crests 9 corresponds to the number of tops 5.

(15) Crests 9 are arranged in the region of the tops 5. In a preferred embodiment a point of the crests 9 closest to the edge 2 corresponds to a middle (in a direction parallel to the edge 2) of the top 5.

(16) The crests 9 extend as close as possible to the top 5. In the embodiment shown, there is a small distance A between an internal border 11 of the corrugated area 4 and the crests 9 of the internal wall 7. However, it is possible that the crests 9 extend at least to the internal border 11 of the corrugated area 4.

(17) Due to the wave shape of the external border 7 the width of the groove 3 varies. In other words, the distance between the external wall 7 and the internal wall 8 varies.

(18) In the embodiment shown, the internal wall 8 is straight. However, it is possible to use an internal wall 8 which is straight only over a part of its length or which is not straight. It is in addition possible to combine sections of the internal wall 8 being straight and sections of the internal wall which are not straight.

(19) The crests 9 and troughs 10 are rounded. It is possible to design the external wall 7 in form of a sinusoidal wave or to design the external wall in a succession of squares or rectangles.

(20) FIG. 2 shows in addition a heat exchanging area 12 of the heat exchanger plate 1 having a herring bone pattern 13.

(21) FIG. 3 shows schematically, how two heat exchanger plates 1a, 1b are mounted to each other. The valleys 6a of the upper heat exchange plate 1a are mounted onto the tops 5b of the lower heat exchanger plate 1b.

(22) FIG. 4 schematically shows the relation of the crests and tops of the assembly of the two heat exchanger plates 1a, 1b. Parts of the upper heat exchanger plate 1a are shown with dotted lines and the corresponding parts of the lower heat exchanger plate 1b are shown in full lines.

(23) It can be seen that the crests 9b of the external wall 7b of the lower heat exchanger plate 1b extend to the tops 5b of the lower heat exchanger plate 1b, whereas the crests 9a of the external wall 7a of the upper heat exchanger plate 1a extend to the tops 5a of the upper heat exchanger plate 1a.

(24) The distance A mentioned above is chosen to be so small that a gasket which is arranged in the groove 3 cannot be pressed through the gap. The smaller the distance A, the smaller the gap and the lower is the risk that leakages occur.

(25) FIG. 5a shows the relation of the crests and tops of the assembly of two heat exchanger plates 1a, 1b of a second embodiment. Parts of the upper heat exchanger plate 1a are shown with dotted lines and the corresponding parts of the lower heat exchanger plate 1b are shown in full lines.

(26) The wavy shape of the external wall 7 is squared or almost squared rather than sine-shaped, like in FIG. 4.

(27) FIG. 5b shows sectional views along the lines A-A and B-B of FIG. 5a. It can be seen that in section A-A the gap has disappeared.

(28) FIG. 6 shows schematically the relation of the crests and tops of the assembly of two heat exchanger plates 1a, 1b of a third embodiment.

(29) FIG. 6a shows a top view and FIG. 6b shows sectional views along lines A-A and B-B of FIG. 6a.

(30) The shape of the border lines 7a, 7b are illustrated as squared, but can also be of a sin-shape or any other curvy form. The shapes are shifted.

(31) It can be seen that the gap 14 between the two plates 1a, 1b have almost disappeared and is so small that there is no risk that a gasket will be pressed through. In this embodiment the two border lines 7a, 7b are at least almost identical. In other words, the border lines are shifted in relation to each other when compared to the embodiment of FIGS. 4 and 5.

(32) While the present disclosure has been illustrated and described with respect to a particular embodiment thereof, it should be appreciated by those of ordinary skill in the art that various modifications to this disclosure may be made without departing from the spirit and scope of the present disclosure.