| 主权项 |
1. A refrigerant evaporator that exchanges heat between fluid flowing outside to be cooled and refrigerant, comprising
a first evaporation unit and a second evaporation unit disposed in series in a flow direction of the fluid, wherein: each of the first evaporation unit and the second evaporation unit has
a heat-exchanging core portion in which a plurality of tubes are stacked, the refrigerant flowing through the plurality of tubes, anda pair of tank portions connected to both ends of the plurality of tubes to collect or distribute the refrigerant flowing through the plurality of tubes; the heat-exchanging core portion of the first evaporation unit has a first core portion defined by a part of the plurality of tubes and a second core portion defined by a rest of the plurality of tubes; the heat-exchanging core portion of the second evaporation unit has a third core portion defined by a part of the plurality of tubes opposing at least a part of the first core portion in the flow direction of the fluid and a forth core portion defined by a part of the plurality of tubes opposing at least a part of the second core portion in the flow direction of the fluid; of the pair of tank portions of the first evaporation unit, one tank portion includes a first refrigerant collection portion to collect the refrigerant from the first core portion and a second refrigerant collection portion to collect the refrigerant from the second core portion; of the pair of tank portions of the second evaporation unit, one tank portion includes a first refrigerant distribution portion to distribute the refrigerant to the third core portion and a second refrigerant distribution portion to distribute the refrigerant to the fourth core portion; the first evaporation unit and the second evaporation unit are coupled via a refrigerant interchanging portion having a first communication portion that introduces refrigerant from the first refrigerant collection portion to the second refrigerant distribution portion and a second communication portion that introduces refrigerant from the second refrigerant collection portion to the first refrigerant distribution portion; of the pair of tank portions of the first evaporation unit, the other tank portion includes a first partition member that divides a tank internal space of the other tank portion to a first tank internal space and a second tank internal space in a longitudinal direction of the tube; the first partition member has a first communication hole to let the first tank internal space and the second tank internal space communicate with each other; of the pair of tank portions of the second evaporation unit, the other tank portion includes a second partition member that divides a tank internal space of the other tank portion to a third tank internal space and a fourth tank internal space in a longitudinal direction of the tube; the second partition member has a second communication hole to let the third tank internal space and the fourth tank internal space communicate with each other; and the first communication hole and the second communication hole are disposed asymmetrically with respect to a virtual line perpendicular to the flow direction of the fluid and passing a center between the other tank portion of the first evaporation unit and the other tank portion of the second evaporation unit. |
