Patent ID: 7013952

Claim:
A stack type heat exchanger, comprising: a plurality of unit frames stacked on one another, each unit frame including a pair of first and second tubes which are parallel to and independent of each other, each of the first and second tubes comprising a pair of plates combined with each other and forming a path for refrigerant, first and second tanks which are disposed at and connected to lower ends of the first and second tubes, respectively, and are independent of each other, and third and fourth tanks which are disposed at and connected to upper ends of the first and second tubes, respectively, and are independent of each other; radiation fins provided between the tubes of the stacked unit frames; an inlet pipe and an outlet pipe which are provided at one side of the stacked unit frames and through which the refrigerant enters and is exhausted, respectively; first burrs which are formed in the first and second tanks and protrude in a direction opposite to a direction in which the refrigerant flows so as to provide resistance to the refrigerant flows in the first and second tanks; and second burrs which are formed in the third and fourth tanks and protrude in the same direction in which the refrigerant flows so as to protrude the refrigerant flows in the third and fourth tanks; wherein, in each of said unit frames, the first and fourth tanks are diagonally arranged with respect to each other, and the second and third tanks are diagonally arranged with respect to each other, and the first burr formed in the first tank protrudes in the same direction as the second burr formed in the fourth tank, and the first burr formed in the second tank protrudes in the same direction as the second burr formed in the third tank.