Heat exchanger with tube bundle

Abstract

A heat exchanger includes a tube bundle including a plurality of heat exchanger tubes, each of the heat exchanger tubes having an inlet, an outlet, an outer surface, and a generally U-shaped bend region disposed between at least two straight tube ends, wherein at least a portion of the at least two straight tube ends includes flat tubes, a jacket part disposed around the tube bundle to enclose at least a portion of the tube bundle, wherein an interior is formed between the tube bundle and the jacket part to receive a coolant around the outer surface of each of the heat exchanger tubes, and a casing cover coupled to the jacket part to form a fluid tight seal therebetween, wherein the inlet and the outlet of each of the heat exchanger tubes fluid-tightly passes through the casing cover and extends outside of the casing cover.

1 . A heat exchanger comprising:
 a tube bundle including a plurality of heat exchanger tubes, each of the heat exchanger tubes having an inlet, an outlet, an outer surface, and a generally U-shaped bend region disposed between at least two straight tube ends, wherein at least a portion of the at least two straight tube ends includes flat tubes;   a jacket part disposed around the tube bundle to enclose at least a portion of the tube bundle, wherein an interior is formed between the tube bundle and the jacket part to receive a coolant around the outer surface of each of the heat exchanger tubes; and   a casing cover coupled to the jacket part to form a fluid tight seal therebetween, wherein the inlet and the outlet of each of the heat exchanger tubes fluid-tightly passes through the casing cover and extends outside of the casing cover.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the bend region of at least one of the heat exchanger tubes has a cross-sectional shape different from a cross-sectional shape of the straight tube ends. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein the straight tube ends are arranged such that a narrow side of each of the flat tubes of adjacent ones of the straight tube ends oppose each other. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein the straight tube ends are arranged such that a wide side of each of the flat tubes of adjacent ones of the straight tube ends oppose each other. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein the bend region of at least one of the heat exchanger tubes has a circular cross-sectional shape. 
     
     
         6 . The heat exchanger according to  claim 1 , wherein the bend region of at least one of the heat exchanger tubes has a rectangular cross-sectional shape. 
     
     
         7 . The heat exchanger according to  claim 1 , wherein the bend region of at least one of the heat exchanger tubes has an oval cross-sectional shape. 
     
     
         8 . The heat exchanger according to  claim 1 , wherein at least one of the heat exchanger tubes is provided with a structured surface. 
     
     
         9 . The heat exchanger according to  claim 1 , wherein the heat exchanger tubes are coupled to each other. 
     
     
         10 . The heat exchanger according to  claim 1 , wherein the bend region of each of a first pair of adjacent ones of the heat exchanger tubes have a generally equal radius with each other and the straight tube ends of each of the first adjacent pair of the heat exchanger tubes have a generally equal length with each other, wherein the bend region of each of a second pair of adjacent ones of the heat exchanger tubes have a different radius from each other. 
     
     
         11 . The heat exchanger according to  claim 1 , wherein the bend regions of adjacent ones of the heat exchanger tubes are arranged in an alternating offset arrangement. 
     
     
         12 . The heat exchanger according to  claim 1 , wherein the casing cover establishes an interface for a connection of the heat exchanger to a exhaust gas system of a motor vehicle. 
     
     
         13 . The heat exchanger according to  claim 1 , wherein each of the heat exchanger tubes is fluidically switched in parallel. 
     
     
         14 . The heat exchanger according to  claim 1 , wherein the casing cover includes a coolant inlet and a coolant outlet. 
     
     
         15 . The heat exchanger according to  claim 1 , wherein the jacket part of the casing is formed from a material with a melting temperature of below 1000° C. 
     
     
         16 . The heat exchanger according to  claim 1 , further comprising a partition wall coupled to the casing cover and projecting into the bend region of the one of the heat exchanger tubes with the smallest radius. 
     
     
         17 . The heat exchanger according to  claim 1 , wherein at least one of the heat exchanger tubes includes a plurality of spaced part recesses in the outside surface thereof. 
     
     
         18 . The heat exchanger according to  claim 17 , wherein the recesses have a generally square shape. 
     
     
         19 . The heat exchanger according to  claim 1 , wherein at least one of the heat exchanger tubes includes a groove formed in the outside surface thereof. 
     
     
         20 . A heat exchanger comprising:
 a tube bundle including a plurality of heat exchanger tubes, each of the heat exchanger tubes having an inlet, an outlet, a structured outer surface, and a generally U-shaped bend region disposed between at least two straight tube ends, wherein at least a portion of the at least two straight tube ends includes flat tubes, and wherein a bend region of at least one of the heat exchanger tubes has at least one of a generally circular cross-sectional shape, a generally oval cross-sectional shape, and a generally rectangular cross-sectional shape;   a jacket part disposed around the tube bundle to enclose at least a portion of the tube bundle, wherein an interior is formed between the tube bundle and the jacket part to receive a coolant around the outer surface of each of the heat exchanger tubes; and   a casing cover coupled to the jacket part to form a fluid tight seal therebetween, wherein the inlet and the outlet of each of the heat exchanger tubes fluid-tightly passes through the casing cover and extends outside of the casing cover.