Patent ID: 6662862
Filing Date: 2003-12-16
Classification: B23K,F28D,F28F

Abstract:
A plate heat exchanger comprising at least one stack of plate elements each of which plate elements has a central heat transferring part and a surrounding edge part (15), the heat transferring parts of the plate elements being permanently joined with each other in a plurality of points having spaced apart areas and between each other limiting flow spaces for at least two heat exchanging fluids (F1, F2) and each plate element being of a double wall construction comprising two heat transferring plates (1, 5; 2, 6; 3, 7; 4, 8) of substantially the same size and pressed to substantially the same form which heat transferring plates are in contact with each other but allow a heat exchanging fluid (F1, F2) that is leaking out through a hole (101) in one of the two heat transferring plates (1, 5; 2, 6; 3, 7; 4, 8) to be led between the heat transferring plates to the edge parts (15) of the plate elements, whereinfor each one of the plate elements the heat transferring plates (1, 5; 2, 6; 3, 7; 4, 8) are tightly in contact with each other except right at at least one of the points with spaced apart areas.