Heat exchanger device and a method for manufacturing the same

Plate heat exchanger (1) device advantageously intended for use with a gas turbine, said plate heat exchanger (1) device comprising:

• a number of corrugated plates (2), each one with a first edge part (3) with an opposing second edge part (4), a third edge part (5) with an opposing fourth edge part (6), in which first and second flow channels (7, 8) are arranged between the corrugated plates (2), every first flow channel being arranged to have a through flow of a heat-emitting medium (9) and every second being arranged to have a through flow of a heat absorbing medium (10), the first flow channels for one of the mediums, advantageously the heat absorbing medium (10) are, via first inlet openings (11) and first outlet openings (12), respectively, connected essentially parallel to in-going and out-going junction channels (13, 14) for said heat absorbing medium (10), wherein that the plates (2) are fitted to each other in pairs, forming cells (15) comprising an inner spacing element (16) welded to and in-going between the plates, where the inner spacing element (16) extends along the edge parts (3–6) with interruption for the first inlet opening (11) and the first outlet opening (13) for one of the mediums, advantageously the heat-absorbing medium (10), where outer spacing elements (17) are welded to the plates (2) on the sides of the plates (2) facing away from each other, along at least two of the edge parts (3–6), the cells (15) are stacked against each other and joined together by welding via the outer spacing elements (17), and said in-going and out-going junction channels (13, 14) are welded to said first inlet opening (11) and first outlet opening (12), respectively;
• said first outlet opening (12) is wider than the first inlet opening (11);
• said inner spacing element (16) of the cell (15) consists of a first inner spacing element (18) along the first edge part (3) and the fourth edge part (6) and a second inner spacing element (19) along the second edge part (4) and the third edge part (5), the first inner spacing element (18) has a first end section (20) thinner than the rest of the first spacing element (18), where the first end section (20) is pleated along the extension of the first inlet opening (11), and the second inner spacing element (19) has a second end section (21) thinner than the rest of the second spacing element (19), where the second end section (21) is pleated along the extension of the first outlet opening (12);
• each of the pleated end sections (20, 21) of the first and second inner spacing elements (18, 19), has a first and a second pleating height, respectively (22, 23), which allows the pleated end sections (20, 21) to act as spacing elements in the first inlet opening (11) and the first outlet opening (12), respectively;
• said corrugated plates (2) are divided into first plates (24) with a first side (25) and a second side (26), corrugated with a first pattern (27), and second plates (28) with a third side (29) and a fourth side (30) corrugated with a second pattern (31), which first and second plates (24, 28) are assembled in pairs with the second side (26) towards the third side (29);
• and
• said first plates (24) are corrugated in such a way that each of the first plates has first depressions (32) and first ridges (33) on the first side, and correspondingly second depressions (34) and second ridges (35) on the second side (26), diagonally from the third edge part (5) to the fourth edge part (6), with the first and the fourth edge parts (3, 6) constituting catheti in an imaginary triangle with the diagonal first depressions (32) as hypotenuse, and in that each of the second plates (28) has third depressions (36) and third ridges (37) on the third side (29), and correspondingly fourth depressions (38) and fourth ridges (39) on the fourth side (30), diagonally from the fourth edge part (6) to the third edge part (5), with the first and third edge parts (3, 5) constituting catheti in an imaginary triangle with the diagonal third depressions (36) as hypotenuse.