Tube bundle heat exchanger comprising tubes with expanded...

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

Patent

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Details

F28D 1/053 (2006.01) F02M 25/07 (2006.01) F28D 7/16 (2006.01) F28F 1/00 (2006.01) F28F 9/02 (2006.01)

Patent

CA 2443496

A heat exchanger useful for high temperature applications such as EGR cooling and fuel reformer applications comprises a tube bundle made up of a plurality of tubes, each having at least one end expanded to an enlarged polygonal cross-section, and having central portions with a generally smaller cross section. When the tubes are formed into a bundle, the enlarged end portions nest with one another and interstitial spaces are provided between the central portions of the tube. The enlarged end portions are preferably retained by a header ring having a multifaceted inner peripheral sidewall which is adapted to form brazed lap joints with the outward facing surfaces of the peripheral tubes end portions in the tube bundle. In one preferred arrangement, axially aligned enlarged portions are provided intermediate the ends of at least some of the tubes. These enlarged intermediate portions nest with one another and eliminate or reduce the need for baffle plates.

Un échangeur de chaleur utile pour les applications à haute température, comme les applications de refroidissement EGR (recirculation des gaz d'échappement) et de dispositif de modification de carburant, comprennent un faisceau de tubes constitué de tubes multiples. Chaque tube présente au moins une extrémité élargie en une section polygonale agrandie, et il comporte des parties médianes avec une section généralement plus petite. Lorsque les tubes forment un faisceau, les parties extrêmes agrandies épousent leur parties homologues et des espaces interstitiels séparent les parties médianes du tube. Les parties extrêmes agrandies sont de préférence retenues par une couronne dont la paroi latérale périphérique intérieure à facettes est adaptée pour former des joints à recouvrement assemblés par brasage fort avec les surfaces faisant face vers l'extérieur des parties extrêmes des tubes périphériques du faisceau de tubes. Dans un montage préféré, des parties agrandies alignées axialement occupent les emplacements intermédiaires des extrémités d'au moins certains des tubes. Ces parties intermédiaires agrandies épousent leurs parties homologues, et elles éliminent ou diminuent le besoin d'installer des chicanes.

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