Heat exchanger

Abstract

A heat exchanger includes a first stack portion and a second stack portion. The first stack portion has a plurality of plates which are stacked, and a first refrigerant passage and a first coolant passage are formed between the plurality of plates. The second stack portion has a plurality of receiver components which are stacked, and a refrigerant retaining portion leading to the first refrigerant passage is formed in the plurality of receiver components. The second stack portion is stacked on the first stack portion in the same direction as a stacking direction in which the plurality of plates are stacked.

What is claimed is: 
     
         1 . A heat exchanger comprising:
 a first stack portion including a plurality of plates which are stacked, a first refrigerant passage and a first coolant passage being formed between the plurality of plates;   a second stack portion including a plurality of receiver components which are stacked, a refrigerant retaining portion leading to the first refrigerant passage being formed in the plurality of receiver components, the second stack portion being stacked on the first stack portion in the same direction as a stacking direction in which the plurality of plates are stacked; and   a third stack portion for subcooling including a plurality of subcool plates which are stacked, a second refrigerant passage for subcooling and a second coolant passage for subcooling being formed between the plurality of subcool plates, the third stack portion being further stacked on one of the first stack portion and the second stack portion, which are stacked.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein each of the plurality of receiver components has a plate shape or a window frame shape. 
     
     
         3 . The heat exchanger according to  claim 2 , wherein a size of each of the plurality of plates in the stacking direction of the plurality of plates is identical to a size of each of the plurality of receiver components in a stacking direction in which the plurality of receiver components are stacked. 
     
     
         4 . The heat exchanger according to  claim 2 , wherein a shape and a size of each of the plurality of plates in an outline obtained by an orthogonal projection onto a surface perpendicular to the stacking direction of the plurality of plates are identical to a shape and a size of each of the plurality of receiver components in an outline obtained by an orthogonal projection onto a surface perpendicular to the stacking direction of the plurality of receiver components. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein the first stack portion, the second stack portion, and the third stack portion are stacked in this order, and the refrigerant retaining portion has a liquid-phase refrigerant retaining portion leading to the second refrigerant passage.