Heat exchanger and integrated-type heat exchanger

Abstract

A heat exchanger 10 cools an air-conditioning refrigerant by means of cooling air. The heat exchanger 10 includes a first heat exchanger core 20 and a second heat exchanger core 30 placed forward and backward with respect to a flowing direction of the cooling air 60 . The heat exchanger 10 further includes a first header tank 40 that is provided in a lower portion of the heat exchanger, and has two independent tank portions 43 and 44 , one of the two tank portions located on a leeward side of the cooling air 60 being in communication with a refrigerant-inlet side of the second heat exchanger core 30 , and the other one of the tank portions located on a windward side being in communication of a refrigerant-outlet side of the first heat exchanger core 20 , the first header tank 40 introducing the refrigerant from the tank portion 43 located on the leeward side, and discharging the refrigerant from the tank portion 44 located on the windward side. The heat exchanger 10 also includes a second header tank 50 that is provided in an upper portion of the heat exchanger, that is in communication with a refrigerant-outlet side of the second heat exchanger core 30 and a refrigerant-inlet side of the first heat exchanger core 20 , and that flows the refrigerant having passed through the second heat exchanger core 30 into the first heat exchanger core 20.

1 - 4 . (canceled) 
   
   
       5 . A heat exchanger that uses CO2 as a refrigerant, that is used in a refrigeration cycle having a high pressure side equal to or higher than a critical point of the refrigerant, and that cools the refrigerant on the high pressure side of the refrigeration cycle by means of cooling air, the heat exchanger comprising:
 a first heat exchanger core and a second heat exchanger core placed forward and backward with respect to a flowing direction of the cooling air;   a first header tank that is provided in a lower portion of the heat exchanger, and has two independent tank portions, one of the two tank portions located on a leeward side of the cooling air being in communication with a refrigerant-inlet side of the second heat exchanger core, and the other one of the tank portions located on a windward side being in communication of a refrigerant-outlet side of the first heat exchanger core, the first header tank introducing the refrigerant from the tank portion located on the leeward side, and discharging the refrigerant from the tank portion located on the windward side; and   a second header tank that is provided in an upper portion of the heat exchanger, that is in communication with a refrigerant-outlet side of the second heat exchanger core and a refrigerant-inlet side of the first heat exchanger core, and that flows the refrigerant having passed through the second heat exchanger core into the first heat exchanger core.   
   
   
       6 . The heat exchanger according to  claim 5 , wherein the two independent tank portions are separated from each other forward and backward as viewed from the flowing direction of the cooling air. 
   
   
       7 . The heat exchanger according to  claim 5 , wherein the first header tank is provided with a slit between the two independent tank portions along a longitudinal direction of the first header tank, and the two tank portions are connected to each other in at least one position. 
   
   
       8 . An integrated-type heat exchanger in which a radiator that cools engine cooling water is integrally provided on a leeward side of the heat exchanger according to  claim 5 . 
   
   
       9 . The heat exchanger according to  claim 6 , wherein the first header tank is provided with a slit between the two independent tank portions along a longitudinal direction of the first header tank, and the two tank portions are connected to each other in at least one position. 
   
   
       10 . An integrated-type heat exchanger in which a radiator that cools engine cooling water is integrally provided on a leeward side of the heat exchanger according to  claim 6 . 
   
   
       11 . An integrated-type heat exchanger in which a radiator that cools engine cooling water is integrally provided on a leeward side of the heat exchanger according to  claim 7 .