Heat exchanger capable of preventing heat stress

Abstract

The object of the present invention is to provide a heat exchanger which can prevent the tubes from being damaged by the heat stress caused by the temperature difference between the reinforcement members and the tubes of the core portion. A heat exchanger comprises a core portion having a plurality of tubes 12 a and fins 12 b which are arrange so as to be alternately laid in layers. In the core portion 12 , the tubes 12 a are arranged at the outermost ends in the piling direction V of the tubes 12 a and the fins 12 b and the inserts ( 14 ) which reinforce the core portion 12 are fixed to the tubes ( 12 a ) and tanks ( 11, 13 ).

1 . A heat exchanger comprising: 
 a core portion having a plurality of tubes through which a first fluid flows and which are arrange so as to be laid in layers, and fins arranged between a plurality of the tubes and for promoting heat exchanging between the first fluid and a second fluid flowing through a space between the tubes; and    tanks arranged at ends of the tubes and communicating with a plurality of the tubes; and    reinforcement members fixed to the tanks and for reinforcing peripheries of the core portion as well as the tanks; wherein    the reinforcement members and the tubes of a plurality of the tubes arranged at the outermost ends in a piling direction of the tubes are arrange so that the tube and the reinforcement member come into contact with each other.    
   
   
       2 . The heat exchanger as set forth in  claim 1 , wherein the reinforcement members are integrally fixed to the tubes of the core portion.  
   
   
       3 . The heat exchanger as set forth in  claim 1 , wherein the reinforcement members and the tubes are independently and respectively fixed to the tanks.  
   
   
       4 . The heat exchanger as set forth in  claim 1;  wherein 
 the reinforcement members are formed in a recess shape a sectional area of which in a direction perpendicular to a longitudinal direction of the reinforcement members has a bottom portion and an opening; wherein    on the bottom portion of the recess shape a protrusion protruding toward an outside of the reinforcement member is formed; and wherein    the protrusion and the tube are formed so as to come into contact with each other.    
   
   
       5 . The heat exchanger as set forth in  claim 1;  wherein 
 in a state in which the reinforcement member and the tube are integrally fixed to each other, when viewing from a direction in which the second fluid flows into spaces between the tubes, the reinforcement member is formed to have fixing portions at which the reinforcement member is in contact with the tube and separated portions at which the reinforcement member is separated from the tube.    
   
   
       6 . The heat exchanger as set forth in  claim 1 , wherein at least a part of the reinforcement member is made of a material larger in an iodization tendency than that of the tubes.  
   
   
       7 . The heat exchanger as set forth in  claim 1 , wherein the reinforcement member is attached with a sacrificial member made of a material larger in an iodization tendency than that of the tubes.  
   
   
       8 . The heat exchanger as set forth in  claim 1 , wherein the tubes have a thickness of 0.3 mm or less.  
   
   
       9 . The heat exchanger as set forth in  claim 1 , wherein the tube and the reinforcement member are in contact with each other in a range of more than half the length in a flowing direction of the second fluid in the tube.  
   
   
       10 . The heat exchanger as set forth in  claim 9 , wherein the reinforcement member is formed so that a section of the reinforcement member perpendicular to a longitudinal direction of the reinforcement member becomes a U shape having a bottom portion and an opening portion and the bottom portion is formed to come into contact with the tube.  
   
   
       11 . The heat exchanger as set forth in  claim 10  wherein, on a bottom portion of the reinforcement member, holes penetrating through the bottom portion are formed.