Heat exchanger

Abstract

A heat exchanger 10 includes a first block and a second block. The first block includes a first tank T 1 having a refrigerant inlet through which the refrigerant flows in, a plurality of first tubes 21 into which the refrigerant having flowed into the first tank T 1 is distributed and flows therein, and a second tank T 2 in which the refrigerant flowing in the first tubes 21 merges. The second block includes a third tank T 3 into which the refrigerant having merged in the second tank T 2 flows therein, a plurality of second tubes 22 into which the refrigerant having flowed into the third tank T 3 is distributed and flows, and a fourth tank T 4 in which the refrigerant flowing in the second tube merges, and having a refrigerant outlet through which the merged refrigerant flows out. A refrigerant passage 43 h through which the refrigerant flows from the second tank T 2 into the third tank T 3 is locally placed on the opposite side of the refrigerant inlet.

1 . A heat exchanger in which a refrigerant successively passes through a first block and a second block and flows out of the second block,
 wherein the first block includes a first tank having a refrigerant inlet through which the refrigerant flows in, a plurality of first tubes into which the refrigerant having flowed into the first tank is distributed and flows therein, and a second tank in which the refrigerant flowing in the first tubes merges,   the second block includes a third tank into which the refrigerant having merged in the second tank flows, a plurality of second tubes into which the refrigerant having flowed into the third tank is distributed and flows therein, and a fourth tank in which the refrigerant flowing in the second tube merges, and having a refrigerant outlet through which the merged refrigerant flows out, and   a refrigerant passage through which the refrigerant flows from the second tank into the third tank is locally placed on the opposite side of the refrigerant inlet.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the first block and the second block are placed in parallel with each other,
 the first tank and the fourth tank are placed on a vertically upper side, and   the second tank and the third tank are placed on a vertically lower side.   
     
     
         3 . The heat exchanger according to  claim 1  or  2 , wherein the refrigerant passage through which the refrigerant flows from the second tank into the third tank is formed by providing a plurality of holes in a partition member provided between the second tank and the third tank. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein the third tank includes at least one resistor against the refrigerant, and
 the resistor is placed on a rear side of the refrigerant passage in a flow direction of the refrigerant.   
     
     
         5 . The heat exchanger according to  claim 4 , wherein the third tank includes a plurality of the resistors. 
     
     
         6 . The heat exchanger according to  claim 5 , wherein the third tank includes a first resistor, and a second resistor placed on a rear side of the first resistor in the flow direction of the refrigerant, and
 an opening rate of the second resistor is equal to or lower than an opening rate of the first resistor.   
     
     
         7 . The heat exchanger according to  claim 2 , wherein a refrigerant channel area in the fourth tank that constitutes the second block is larger than a refrigerant channel area in the first tank that constitutes the first block. 
     
     
         8 . The heat exchanger according to  claim 2 , wherein a refrigerant channel area in the third tank that constitutes the second block is larger than a refrigerant channel area in the second tank that constitutes the first block. 
     
     
         9 . The heat exchanger according to  claim 1 , wherein a refrigerant channel area of the second tube that constitutes the second block is larger than a refrigerant channel area of the first tube that constitutes the first block.