Heat exchanger

Abstract

A heat exchanger includes core portions are overlapped in an air-flow direction, each having a pair of header tanks facing with each other and tubes configured to connect the header tanks and to perform heat exchange between a heat transfer medium flowing inside the tubes and air flowing around the tubes. A passage forming member is between first and second header tanks. Each of these header tanks has, at a mutually facing portion thereof, a tank side hole, the passage forming member has the communication hole, the communication hole allowing mutually facing tank side holes to communicate with each other. The first hole of the tank side hole and the communication hole is the elongated hole longer than the second hole of the tank side hole and the communication hole in the header tank length direction. The first hole communicates with the second hole in a plurality of number.

1 . A heat exchanger configured to perform heat exchange between air and a heat transfer medium undergoing a phase change between a liquid phase and a gaseous phase, the heat exchanger comprising:
 core portions provided such that a plurality of core portions are overlapped in an air-flow direction, the core portions each having header tanks provided as a pair facing with each other and a plurality of tubes configured to connect the header tanks to each other and to perform the heat exchange between the heat transfer medium flowing inside the tubes and the air flowing around the tubes; and   a passage forming member provided between a first header tank of the header tanks, which is arranged so as to be overlapped, and a second header tank of the header tanks, which is arranged so as to be overlapped, wherein   the first header tank and the second header tank each has, at a mutually facing portion thereof, a tank side hole,   the passage forming member has a communication hole, the communication hole being configured to allow mutually facing tank side holes of the tank side hole to communicate with each other, and   a first hole of the tank side hole and the communication hole is an elongated hole having a length longer than a length of a second hole of the tank side hole and the communication hole in the tank-length direction, the first hole being configured to communicate with the second hole in a plurality of number.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the header tanks have a plurality of tube insertion ports into which the tubes are respectively inserted, the header tanks being formed to have a tubular shape elongated in an arrangement direction of the tubes, and   when an imaginary region extending in a circumferential direction of the header tanks through a connecting portion provided between adjacent tank side holes of the tank side hole is assumed, the tube insertion ports include a tube insertion port opening in the imaginary region.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 a length dimension of the first hole is longer than a length dimension from a first end to a second end of the second holes in adjacent positions as a pair.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the first core portion and the second core portion, which are arranged so as to be overlapped, each has a plurality of divided core portions, the divided core portions being formed by being divided in an the arrangement direction of the tubes and each having independent flow path of the heat transfer medium, and   the passage forming member is provided between the header tanks of the respective divided core portions, which are arranged so as to be overlapped.