Stack type heat exchanger

Abstract

The heat exchanger performance of a stack type heat exchanger used as an aircraft engine oil cooler or the like is increased. U-turn type layered hot fluid passages having corrugated fins and U-turn type layered cold fluid passages having corrugated fins are alternately stacked to configure a stacked core. Mixing headers are provided to both side surfaces of the stacked core so as to pass a hot fluid which circulates on a first half side and a return path side through the mixing headers outside of the stacked core. The mixing headers mix the hot fluid which circulates in the inside portion of the U-turn passage and the hot fluid which circulates in the outside portion thereof. The hot fluids are mixed between the plural stacked hot fluid passages. The temperature distribution of the hot fluid in the first half and in the passage width direction is made uniform.

1 . A stack type heat exchanger comprising:
 a stacked core in which U-turn type layered hot fluid passages through which a hot fluid circulates and U-turn type layered cold fluid passages through which a cold fluid circulates are alternately stacked,   wherein each of the outer surfaces of the stacked core on the first half side and on the return path side has a mixing header which communicates with each of the hot fluid passages in the stacking direction,   wherein each of the hot fluid passages has therein a fluid draw-in/draw-out passage that passes the hot fluid circulating in each of the passages through the mixing header.   
     
     
         2 . The stack type heat exchanger according to  claim 1 , wherein the fluid draw-in/draw-out passage passes the hot fluid circulating in the entire area in the width direction from the outside to the inside of the U-turn passage through the mixing header. 
     
     
         3 . The stack type heat exchanger according to  claim 1  or  2 , wherein the mixing header on the first half side serves as the bypass header.