Heat exchanger

F - Mech Eng,Light,Heat,Weapons – 28 – D

Patent

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Details

F28D 9/00 (2006.01) F28F 3/02 (2006.01) F28F 3/08 (2006.01)

Patent

CA 2335011

The invention provides an improved heat exchanger of the so-called "pin-fin" type. The heat exchanger comprises a stack of parallel perforated plates (10, 20, 30, 70, 80), each plate (10, 20, 30, 70, 80) of the stack having perforations (15A), characterised in that the perforations (15A) define an array of spaced column precursors (16, 21, 31), of thickness equal to the plate thickness, the column precursors (16, 21, 31) being joined together by ligaments (17, 22A, 22B, 32, 33), each ligament extending between a pair of adjacent column precursors, the ligaments (17, 22A, 22B, 32, 33) having a thickness less than the plate thickness, the column precursors (16, 21, 31) of any one plate being coincident in the stack with the column precursors (16, 21, 31) of any adjacent plate whereby the stack is provided with an array of individual columns, each column extending perpendicularly to the plane of the plates (10, 20, 30, 70, 80), whereby fluid flowing through the stack is forced to follow a tortuous flow path to flow around the columns.

L'invention concerne un échangeur de chaleur amélioré du type "à aiguilles", qui comprend une pile de plaques perforées parallèles (10, 20, 30, 70, 80). Les perforations (15A) de chaque plaque (10, 20, 30, 70, 80) se caractérisent en ce qu'elles délimitent un réseau de précurseurs en colonne espacés dont l'épaisseur est égale à celle des plaques. Les précurseurs en colonne (16, 21, 31) sont reliés ensemble par des ligaments (17, 22A, 22B, 32, 33), chaque ligament s'étendant entre une paire de précurseurs adjacents. Les ligaments (17, 22A, 22B, 32, 33) ont une épaisseur inférieure à celle des plaques. Les précurseurs en colonne (16, 21, 31) d'une quelconque plaque coincident dans la pile avec les précurseurs en colonne d'une quelconque plaque adjacente. La pile est munie d'un réseau de colonnes individuelles qui s'étendent chacune perpendiculairement au plan des plaques (10, 20, 30, 70, 80), si bien qu'un liquide s'écoulant à travers la pile est forcé de suivre un trajet tortueux autour des colonnes.

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