Patent ID: 8091619
Filing Date: 2012-01-10
Classification: F28F

Abstract:
1. A fully brazed heat exchanger comprising a plurality of pairs of heat exchanger plates, each heat exchanger plate formed of pressed sheet metal disposed along a central plane with a pattern comprising at least one section with bulges extending from the central plane in a first direction normal to the central plane and hollows extending in a second direction from the central plane, the second direction being opposite the first direction, said bulges and hollows having flat tops and bottoms and each of the bulges and hollows including a substantially parabolic-shaped flank, wherein each pair of the heat exchanger plates is fully brazed together, with the flat tops of the bulges of one of the pair of heat exchanger plates abutting and firmly brazed to the corresponding flat bottoms of the hollows of the other of the pair of heat exchanger plates, the surface area of each of said tops and bottoms having a size in relation to the distance between said tops and bottoms such that channels for flow of a medium are formed between pairs of adjacent bulges, the channels including substantially flat areas at locations between adjacent bulges, the substantially flat areas being substantially parallel to the flat tops and bottoms of the bulges and hollows, wherein the substantially flat areas are not joined with an adjacent heat exchanger plate, wherein the flanks of the bulges and hollows have an edge angle of approximately 45°, and wherein each heat exchanger plate includes a saddle-shaped area of freely deformed pressed sheet metal between adjacent flat bottoms of the bulges and flat tops of the hollows, the flat tops and bottoms being circular, the surface areas of said tops and bottoms each having a radius that is optimized in size in relation to the distance between the tops and bottoms, whereby a strength of the heat exchanger is increased by means of the optimized radius, and the radius of each of the tops and the bottoms being within the range of 0.5×a to 1×a, wherein a is the distance from an edge of the top to an edge of the bottom.