Heat exchanger having superheated coolant bypass passage

Abstract

A heat exchanger includes a flow passage formed by stacking a plurality of laminated plates, cooling fins installed between the plates, and a tank part prepared on top of the plates and connected to a coolant inlet and a coolant outlet. The tank part has a bypass means for allowing the coolant in a gas state to move toward the coolant outlet without returning to the flow passage.

What is claimed is:  
     
         1 . A heat exchanger including a flow passage formed by stacking a plurality of plates with cooling fins installed between the plates and a tank part located on top of the plates and connected to a coolant inlet and a coolant outlet, wherein heat exchange is performed between air and a coolant through cooling fins when the coolant circulates through the flow passage formed by the plates, the tank part comprising: 
 a bypass means for allowing the coolant in a gas state to move to the coolant outlet without returning to the flow passage.    
     
     
         2 . The heat exchanger of  claim 1 , wherein the bypass means is a plurality of bypass holes formed at the upper portion of the tank part in a zigzag pattern.  
     
     
         3 . The heat exchanger of  claim 1 , wherein the bypass means is formed by expanding an upper portion of the tank part.