Heat exchanger

A heat exchanger comprising:

• a core configured by stacking a plurality of plates and configured to allow a heat exchange medium to exchange heat;
• a top plate disposed above the core;
• and
• a connection flange provided on the top plate,
• wherein the connection flange comprises:
• a body;
• an inlet pipe formed at one side of the body and configured such that a refrigerant introduced through the inlet pipe;
• and
• an outlet pipe formed at the other side of the body and configured such that the refrigerant is discharged through the outlet pipe,
• wherein the core is configured such that the refrigerant introduced into the core through the inlet pipe of the connection flange flows in the core and then is discharged through the outlet pipe of the connection flange,
• wherein a first refrigerant flow path, which is vertically formed at one side of the core and allows the refrigerant to flow therethrough in a plate stacking direction, a second refrigerant flow path, which is vertically formed at another side of the core and allows the refrigerant to flow therethrough in the plate stacking direction, and a third refrigerant flow path, which is vertically formed at the other side of the core and allows the refrigerant to flow therethrough in the plate stacking direction, are formed in the core, and
• wherein a blocking structure is provided in the first refrigerant flow path and prevents the refrigerant between the first refrigerant flow path and the third refrigerant flow path from being introduced into the opposite flow paths through a space between the two adjacent plates.