Heat exchanger

Abstract

A heat exchanger may include an exhaust gas pipe having a plurality of bypass holes formed at an exterior circumference of one end and a valve mounted at another end, exhaust gas selectively flowing into the bypass holes, a case forming a radial outer flowing space, and having coolant exhaust and inflow ports, first and second headers dividing the flowing space, a first connecting member adapted to receive the exhaust gas through the bypass hole, a second connecting member, an oil flowing section including an inner pipe, an outer pipe and an oil line formed between the inner pipe and the outer pipe, and at least one heat radiating unit disposed between the exhaust pipe and the oil flowing section provided with at least one coupling pipe adapted to connect the first header with the second header.

1 . The heat exchanger of  claim 15 , wherein the protruding portion is integrally formed at the plate by pressing. 
     
     
         2 . The heat exchanger of  claim 15 , wherein the protruding portion is provided with an exterior circumference and an interior circumference formed with semi-circular shape and is disposed as spiral shape along a length direction of the plate. 
     
     
         3 . The heat exchanger of  claim 2 , wherein both ends of the heat radiating unit are inserted respectively in the first header and the second header, and the protruding portion is not formed at the both ends of the heat radiating unit. 
     
     
         4 . The heat exchanger of  claim 15 , wherein the coupling pipe is a circular pipe formed by a plurality of protruding portions, and an interior circumference and an exterior circumference of the coupling pipe are formed as spiral shape such that vortex is generated at the exhaust gas flowing in the connecting line by rotation of the exhaust gas and the coolant passing the outside of the connecting line is caused to form turbulence. 
     
     
         5 . The heat exchanger of  claim 15 , wherein the coupling pipe, in a state that protruding portions of a pair of plates are disposed so as to be protruded toward the outside, is formed by coupling the pair of plates. 
     
     
         6 . The heat exchanger of  claim 15 , wherein the number of the coupling pipes included in the heat radiating unit is changed according to a diameter of the exhaust pipe and sizes of the first header and the second header. 
     
     
         7 . The heat exchanger of  claim 6 , wherein the coupling pipes of one heat radiating unit are releasably assembled with each other. 
     
     
         8 . The heat exchanger of  claim 15 , wherein a plurality of rows of protruding portions is formed at one plate, and the one plate is folded to form the heat radiating unit such that one row of protruding portions is connected to another row of protruding portions so as to form the coupling pipe. 
     
     
         9 . The heat exchanger of  claim 15 , wherein the heat radiating unit encloses an exterior circumference of the exhaust pipe between the exterior circumference of the exhaust pipe and the inner pipe of the oil flowing section. 
     
     
         10 . The heat exchanger of  claim 15 , wherein the heat radiating units are disposed apart from each other between the outer pipe of the oil flowing section and the case. 
     
     
         11 . The heat exchanger of  claim 15 , wherein the plate is provided with at least one flowing hole formed between the coupling pipes. 
     
     
         12 . The heat exchanger of  claim 15 , wherein a plurality of first and second mounting holes is formed at the first and second headers, and the both ends of the heat radiating unit are inserted in the first and second mounting holes, respectively. 
     
     
         13 . The heat exchanger of  claim 15 , wherein the oil exhaust port and the oil inflow port are formed at a side and the other sided of the case corresponding to the coolant exhaust port and the coolant inflow port, respectively. 
     
     
         14 . The heat exchanger of  claim 15 , wherein a flowing direction of the exhaust gas passing through the connecting line is opposite to that of the transmission oil passing through the oil line and that of the coolant passing through the flowing space of the case. 
     
     
         15 . A heat exchanger comprising:
 an exhaust gas pipe having a plurality of circumferential bypass holes formed at one end and a valve mounted at another end, wherein an exhaust gas selectively flows into the bypass holes when the valve is closed;   a outer radial case forming an annular flowing space between the case and the exhaust gas pipe, the case having a coolant exhaust port formed on one side thereof and a coolant inflow port formed on another side thereof;   first and second headers mounted respectively at opposing ends of the case and dividing the flowing space;   a first connecting member interconnecting one end of the case to the one end of the exhaust gas pipe to receive exhaust gas through the bypass holes;   a second connecting member having one end connected to another end of the case;   an oil flowing section formed between the exhaust gas pipe and the case, and including   an inner pipe, an outer pipe and an oil line formed between the inner pipe and the outer pipe, the oil line being fluidly connected to an oil inflow port and an oil exhaust port; and   at least one heat radiating unit disposed between the exhaust pipe and the oil flowing section, and at least another heat radiating unit disposed between the case and the oil flowing section, each provided with at least one coupling pipe formed by coupling at least one plate at which at least one protruding portion is formed along a length direction, and adapted to connect the first header with the second header;   wherein a connecting line is formed in the coupling pipe so as for the exhaust gas flowing into the first connecting member to flow therein, and the exhaust gas flowing in the connecting line exchanges heat with coolant and transmission oil passing an outside of the coupling pipe.