Heat exchanger

Abstract

The invention relates to a heat exchanger ( 5 ) comprising a block ( 2 ) which is provided with parallel ducts and can be penetrated in opposite directions in at least two passages ( 2 a, 2 b ) by a medium that is to be cooled. A bypass duct ( 6 ) which be penetrated by the medium that is to be cooled is assigned o the first passage ( 2 a ).

1 . A heat exchanger comprising a core having flow channels arranged parallel to one another which can receive a throughflow of a medium to be cooled in at least a first passage and a second passage in opposite directions, and a bypass channel for the supply of the medium, which can receive a throughflow of the medium to be cooled, wherein the bypass channel is associated with the first passage. 
   
   
       2 . The heat exchanger according to  claim 1 , wherein a first collection box is associated with the core; the collection box having an inlet chamber for the first passage and an outlet chamber for the second passage. 
   
   
       3 . The heat exchanger according to  claim 1 , wherein a second collection box is associated with the core as a deflection box for the first and second passages. 
   
   
       4 . Heat exchanger according to  claim 1 , wherein the bypass channel is branched off before entry into core. 
   
   
       5 . heat exchanger according to  claim 4 , wherein the bypass channel is branched off from the inlet chamber. 
   
   
       6 . The heat exchanger according to  claim 3 , wherein the bypass channel discharges into the deflection box. 
   
   
       7 . The heat exchanger according to  claim 2 , wherein the inlet chamber and the outlet chamber are separated from one another by a separation wall. 
   
   
       8 . The heat exchanger according to  claim 1 , wherein the passages have flow channels having cross sections which behave in a 1:1 ratio for the first and the second passages. 
   
   
       9 . The heat exchanger according to  claim 7 , wherein the bypass channel discharges into an inlet opening of the deflection box. 
   
   
       10 . The heat exchanger according to  claim 9 , wherein the inlet opening is located in an area (b) of a line (m) marking the position of the separation wall and that the area (b) deviates to either side of the line (m) by approximately 15% of the width of the core. 
   
   
       11 . The heat exchanger according to  claim 1 , wherein the bypass channel is a separate bypass line. 
   
   
       12 . The heat exchanger according to  claim 1 , wherein the bypass channel is integrated into the heat exchanger. 
   
   
       13 . The heat exchanger according to  claim 12 , wherein the heat exchanger has at least one side part, arranged parallel to flow channels in the first passage, which is designed as a flow channel and can receive a throughflow as the bypass channel. 
   
   
       14 . A coolant/air radiator for the coolant circulation of an internal combustion engine for a motor vehicle comprising the heat exchanger according to  claim 1 . 
   
   
       15 . The heat exchanger according to  claim 10 , wherein the bypass line has a diameter of 7 to 16 mm. 
   
   
       16 . The radiator according to  claim 14 , wherein the proportion of the throughput through the bypass channel can be established at 10 to 25% of the throughput through the radiator. 
   
   
       17 . The radiator according to  claim 16 , wherein the flow rate of the coolant in the bypass channel is higher than the flow rate in flow channels of the first passage. 
   
   
       18 . The radiator of  claim 17 , wherein the flow channels are designed as tubes, and the cored is designed as a tube/fin core. 
   
   
       19 . The heat exchanger according to  claim 3 , wherein the bypass channel projects at least in part into the deflection box by means of an introduction tube.