Refrigerant evaporator with refrigerant distribution

An evaporator for performing heat exchange between refrigerant flowing therethrough and outside fluid flowing outside said evaporator, said evaporator comprising:

• a first upstream core having a plurality of first upstream tubes through which refrigerant flows in a longitudinal direction of said first upstream tubes, said first upstream tubes being arranged parallel to each other in a line in a width direction perpendicular to both of a flow direction of said outside fluid and said longitudinal direction of said first upstream tubes;
• a second upstream core adjacent said first upstream core in said width direction, said second upstream core having a plurality of second upstream tubes through which refrigerant flows in a longitudinal direction of said second upstream tubes, said first and second upstream tubes being arranged parallel to each other in a line in said width direction;
• a first downstream core disposed at a direction downstream side of said first upstream core in said flow direction of said outside fluid, said first downstream core having a plurality of first downstream tubes through which refrigerant flows in a longitudinal direction of said first downstream tubes, said first downstream tubes being arranged parallel to each other in a line in said width direction;
• a second downstream core disposed at a direct downstream side of said second upstream core in said flow direction of said outside fluid to be adjacent to said first downstream core in said width direction, said second downstream core having a plurality of second downstream tubes through which refrigerant flows in a longitudinal direction of said second downstream tubes, said first and second downstream tubes being arranged parallel to each other in a line in said width direction;
• first and second upstream tanks for distributing refrigerant into said first and second upstream tubes and for collecting refrigerant from said first and second upstream tubes, said first upstream tank being connected to one longitudinal end of said first and second upstream tubes, and said second upstream tank being connected to the other longitudinal end of said first and second upstream tubes;
• and
• first and second downstream tanks for distributing refrigerant into said first and second downstream tubes and for collecting refrigerant from said first and second downstream tubes, said first downstream tank being connected to one longitudinal end of said first and second downstream tubes, and said second downstream tank being connected to the other longitudinal end of said first and second downstream tubes, wherein:
• said first downstream tank connected to said first downstream tubes of said first downstream core has an inlet for introducing refrigerant at an end side in said width direction, and said first upstream tank connected to said first upstream tubes of said first upstream core has an outlet for discharging refrigerant at said end side in said width direction;
• said first downstream tank connected to said second downstream tubes of said second downstream core and said first upstream tank connected to said second upstream tubes of said second upstream core have a plurality of communication holes through which said first downstream tank and said first upstream tank communicate with each other;
• said second downstream tank connected to said second downstream tubes, has therein a throttle for reducing a refrigerant passage area;
• and
• said first and second downstream tanks and said first and second upstream tanks are disposed in such manner that refrigerant introduced from said inlet flows through said first downstream tank connected to said first downstream tubes, said first downstream tubes, said second downstream tank, said second downstream tubes, said first downstream tank connected to said second downstream tubes, said communication holes, said first upstream tank, and is discharged to an outside from said outlet.