Heat exchanger, especially gas cooler

Abstract

The invention relates to a heat exchanger, especially a gas cooler for a CO2 coolant circuit of a motor vehicle air conditioning unit, comprising at least one collecting box that is divided into two longitudinal ducts by means of a longitudinal partition, and a series of flat tubes that are provided with ends which are accommodated within openings located in the collecting box and are fluidically connected to the longitudinal ducts.

1 . A heat exchanger, especially gas cooler for a CO2 coolant circuit of a motor vehicle air conditioning system, having at least one collecting box ( 2 ) which is divided into two longitudinal ducts ( 5 ,  6 ) by a longitudinal dividing wall ( 7 ), and a series of flat tubes ( 3 ) with flat tube ends ( 3   a ) which are accommodated in openings ( 4 ) in the collecting box ( 2 ), and are fluidically connected to the longitudinal ducts ( 5 ,  6 ), wherein the collecting box ( 2 ) with the longitudinal ducts ( 5 ,  6 ) is bent from a prepared sheet metal strip ( 8 ) with longitudinal edges ( 9 ,  10 ) having tongues ( 11 ,  12 ) and a central connecting region ( 14 ) having cutouts ( 13 ), the longitudinal edges ( 9 ,  10 ) forming the longitudinal dividing wall ( 7 ) and being anchored in the cutouts ( 13 ) via the tongues ( 11 ,  12 ).  
   
   
       2 . The heat exchanger as claimed in  claim 1 , wherein the tongues ( 11 ,  12 ) and cutouts ( 13 ) are arranged on the side of the collecting box ( 2 ) facing the flat tubes ( 3 ).  
   
   
       3 . The heat exchanger as claimed in  claim 1 , wherein the tongues ( 23 ) and the cutouts ( 24 ) are arranged on the side of the collecting box ( 21 ) facing away from the flat tubes ( 22 ).  
   
   
       4 . The heat exchanger as claimed in  claim 1 , wherein the longitudinal dividing wall ( 7 ,  25 ) has notches ( 15 ,  27 ) in which the flat tube ends ( 3   a ,  22   a ) engage.  
   
   
       5 . The heat exchanger as claimed in  claim 1 , wherein the collecting box or parts of the collecting box are provided with corresponding shaped portions, integrally formed-on portions and/or beads which serve as stops for the tubes.  
   
   
       6 . The heat exchanger as claimed in  claim 4 , wherein gaps ( 16 ,  28 ) are left between the notches ( 15 ,  27 ) and the flat tube ends ( 3   a ,  22   a ).  
   
   
       7 . The heat exchanger as claimed in  claim 6 , wherein the gaps ( 16 ) are formed in a U shape.  
   
   
       8 . The heat exchanger as claimed in  claim 6 , wherein the gaps are arranged laterally and the notches form a stop for the tube ends.  
   
   
       9 . The heat exchanger as claimed in  claim 6 , wherein gaps ( 28 ) are arranged above and/or below the flat tube ends ( 22   a ,  22   b ).  
   
   
       10 . The heat exchanger as claimed in  claim 1 , wherein the tongues ( 11 ,  12 ;  23 ) and cutouts ( 13 ,  24 ) are arranged between the n-th flat tube ( 3 ,  22 ), where n=1, 2, 3, 4, 5, . . . .  
   
   
       11 . The heat exchanger as claimed in  claim 1 , wherein the cross sections of the longitudinal ducts ( 5 ,  6 ;  23 ,  24 ;  36 ,  37 ) are of approximately circular design, in particular over a circumferential range of at least 270 degrees.  
   
   
       12 . The heat exchanger as claimed in  claim 11 , wherein the central connecting region ( 35 ) which accommodates the tongues ( 34 ) is stepped back in the direction of the longitudinal dividing wall ( 33 ) by an amount x and is curved toward the outside.  
   
   
       13 . The heat exchanger as claimed in  claim 1 , wherein the cross sections of the longitudinal ducts are different in shape and/or size.  
   
   
       14 . The heat exchanger as claimed in  claim 1 , wherein the longitudinal dividing wall has at least one opening or notch or overflow opening.