Heat exchanger for a motor vehicle

Abstract

The invention relates to a heat exchanger ( 100 ) for a motor vehicle, comprising a first circuit ( 110 ) comprising at least one first group of chambers ( 75 ) and one second group of chambers ( 76 ) intended to be traversed by a heat transfer fluid, and a second circuit ( 120 ) intended to be traversed by a coolant, the heat exchanger ( 100 ) being configured to implement an exchange of heat between the heat transfer fluid and the coolant, the heat exchanger ( 100 ) comprising at least one component ( 155 ) for differentiating the flow of heat transfer fluid circulating in the first group of chambers ( 75 ) from the flow of heat transfer fluid circulating in the second group of chambers ( 76 ) of the first circuit ( 110 ).

1 . A heat exchanger for a motor vehicle comprising:
 a first circuit through which a heat-transport liquid is intended to pass and which comprises a first inlet header via which the heat-transport liquid is admitted to the first circuit and a first outlet header via which the heat-transport liquid leaves the first circuit,   the first circuit comprising a plurality of chambers which are fluidically connected to the first inlet header and to the first outlet header and are split into at least a first group of chambers and a second group of chambers; and   a second circuit through which a refrigerant fluid is configured to pass and which comprises a second inlet header via which the refrigerant fluid is admitted into the heat exchanger and a second outlet header via which the refrigerant fluid leaves the heat exchanger, the second circuit comprising at least two successive passes,   the heat exchanger being configured to perform an exchange of heat between the heat-transport liquid circulating in at least one of the groups of chambers and at least one of the passes of the second circuit,   wherein the heat exchanger comprises at least one differentiation member for differentiating the per-chamber flowrate of heat-transport liquid circulating in the first group of chambers from the per-chamber flowrate of heat-transport liquid circulating in the second group of chambers of the first circuit.   
     
     
         2 . The heat exchanger as claimed in  claim 1 , wherein each chamber is delimited by at least two plates, each plate comprising a bottom wall surrounded by a turned-up edge, the bottom wall being provided with at least one opening which at least in part delimits the first inlet header, the two plates being positioned one inside the other. 
     
     
         3 . The heat exchanger as claimed in  claim 1 , wherein the first inlet header comprises a first conduit supplying the first group of chambers and a second conduit supplying the second group of chambers, the differentiation member involving a second bore section of the second conduit that is smaller than a first bore section of the first conduit. 
     
     
         4 . The heat exchanger as claimed in  claim 3 , wherein a ratio between the second bore section of the second conduit and the first bore section of the first conduit is comprised between 0.4 and 0.8. 
     
     
         5 . The heat exchanger as claimed in  claim 2 , wherein the bottom walls of the at least two plates each comprise at least a first opening and a second opening, which respectively make up the first conduit and the second conduit of the first inlet header. 
     
     
         6 . The heat exchanger as claimed in  claim 4 , wherein the differentiation member is formed of at least a second opening that makes up the second conduit. 
     
     
         7 . The heat exchanger as claimed in  claim 5 , wherein the differentiation member comprises all of the second openings of the second conduit. 
     
     
         7 . The heat exchanger as claimed in  claim 1 , comprising at least one heat-transport-liquid supply unit, the supply unit being fluidically connected to the first inlet header which comprises a first conduit supplying the first group of chambers and a second conduit supplying the second group of chambers. 
     
     
         8 . The heat exchanger as claimed in  claim 7 , wherein the supply unit comprises a first duct supplying the first conduit and a second duct supplying the second conduit of the first inlet header, the differentiation member involving a second bore section of the second duct that is smaller than a first bore section of the first duct. 
     
     
         9 . The heat exchanger as claimed in  claim 3 , wherein the first heat-transport liquid circuit comprises a third group of chambers which are fluidically connected to the first conduit of the first inlet header and to the first outlet header successively to the first group of chambers, the heat-transport liquid flowrate differentiation member comprising at least a third bore section of the first conduit, positioned between the first group of chambers and the third group of chambers, the third bore section being smaller than the first bore section of the first conduit. 
     
     
         10 . A thermal conditioning system for a motor vehicle comprising at least one heat exchanger as claimed in  claim 1 .