Exhaust gas heat exchanger

F - Mech Eng,Light,Heat,Weapons – 02 – M

Patent

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Details

F02M 25/07 (2006.01) F28D 7/16 (2006.01) F28F 27/02 (2006.01)

Patent

CA 2474065

The invention relates to an exhaust gas heat exchanger (2) comprising a bundle of pipes (21) consisting of exhaust gas pipes (22) and a bypass channel (23) in a common housing. The pipe bundle is arranged in a first chamber that is crossflown by a liquid coolant and the bypass channel is arranged in a second, separate chamber. The pipe bundle and the bypass channel lead into a common exhaust gas inlet area and a common exhaust gas outlet area in which an exhaust gas valve actuated by a servo-drive is arranged, said valve guiding the exhaust gas flow through the pipe bundle or the bypass channel. According to the invention, the exhaust gas valve has a movable closing organ that is resistant to bending, said organ being preferably embodied as a pivoting semi- flap (27) that is fixed with a longitudinal side (28) to a drive shaft (30) that is arranged crosswise relative to the exhaust gas flow (A).

L'invention concerne un échangeur thermique de gaz d'échappement (20), comprenant dans un boîtier commun un faisceau de tubes (21) constitué de tubes d'échappement (22) et un canal de dérivation (23). Le faisceau de tubes est installé dans une première chambre traversée par un liquide de refroidissement et le canal de dérivation est installé dans une deuxième chambre séparée. Ce faisceau tubulaire et ce canal de dérivation débouchent dans une zone d'entrée des gaz d'échappement commune et une zone de sortie des gaz d'échappement commune, dans laquelle est située une soupape d'échappement actionnée par un mécanisme de commande et dirigeant le flux d'échappement à travers le faisceau de tubes ou le canal de dérivation. Selon la présente invention, cette soupape d'échappement présente un organe de fermeture mobile résistant à la flexion, conçu de préférence sous la forme d'un demi-clapet pivotant (27), fixé au niveau d'un côté longitudinal (28) sur un arbre de transmission (30) placé perpendiculairement au flux d'échappement (A).

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