Heat exchanger

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

Patent

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Details

F28D 9/00 (2006.01) F28F 9/00 (2006.01)

Patent

CA 2268706

In the case where a partition for partitioning a combustion gas passage inlet (11) from an air passage outlet (16) is defined by a plate (8) attached by brazing to end faces of a plurality of heat exchanger plates (S1, S2) in a heat exchanger (2), durability of the brazed portions are prevented from being degraded due to a load F acting on the plate (8) by a pressure differential between a combustion gas and air. Thus a joint substrate (26) is attached by brazing to the end faces of the heat exchanger plates (S1, S2) with the front surface of the joint substrate (26) brazed to the rear surface of a joint flange (28), which is formed by bending an end of the plate (8) by right angles, and a joint flange (27) having an L-shaped cross section is attached by brazing to an underside of the plate (8) and the front surface of the joint substrate (26). Accordingly, the joint portions are increased in rigidity to ease stress concentration, thus enhancing durability.

Cette invention concerne un échangeur de chaleur dans lequel une cloison assure la séparation entre l'entrée (11) du passage des gaz de combustion et la sortie (16) du passage de l'air. Cette cloison consiste en une plaque (8) qui est fixée par brasage aux faces extrêmes de plusieurs plaques d'échange thermique (S1, S2) situées dans l'échangeur de chaleur (2). Le différentiel de pression entre les gaz de combustion et l'air va générer une charge (F) s'exerçant sur la plaque (8), ce qui permet d'accroître la durabilité des parties brasées. Un substrat d'assemblage (26) est fixé par brasage aux faces extrêmes des plaques (S1, S2) de l'échangeur de chaleur. La surface avant dudit substrat (26) est brasée sur la surface arrière d'un rebord d'assemblage (28) qui est formé en pliant une extrémité de la plaque (8) à angle droit. Un rebord d'assemblage (27) possédant une section en forme de L est en outre fixé par brasage au dessous de la plaque (8) et à la surface avant du substrat d'assemblage (26). Les parties assemblées possèdent ainsi une rigidité accrue qui permet de soulager les concentrations de contraintes et, partant, d'accroître la durabilité.

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Profile ID: LFCA-PAI-O-1742008

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