REFRIGERANT EVAPORATOR

摘要

A refrigerant evaporator includes four core portions. A part of the refrigerant passes through a first core portion and a fourth core portion. The other part of the refrigerant passes through a second core portion and a third core portion. An exchanging unit exchanges the positions where the refrigerant flows. A passage through which the second core portion communicates with the third core portion includes a throttle passage in the intermediate tank unit. The throttle passage and the end portion of the intermediate tank unit reverse the refrigerant flow toward a partitioning member. Since the distribution of a liquid-phase refrigerant is adjusted by the throttle passage, a concentration of the liquid-phase refrigerant on a position in the vicinity of an outlet of the third core portion is suppressed. Accordingly, the concentration of the liquid-phase refrigerant in the core portions located downstream of the refrigerant flow is suppressed.

主权项

1. A refrigerant evaporator in which heat exchange is performed between a subject-to-cooling fluid and a refrigerant, the refrigerant evaporator comprising:
a first core portion having a plurality of tubes in which the refrigerant flows, a heat exchange being performed between a part of the subject-to-cooling fluid and a part of the refrigerant in the first core portion; a second core portion having a plurality of tubes in which the refrigerant flows, a heat exchange being performed between another part of the subject-to-cooling fluid and another part of the refrigerant in the second core portion; a third core portion having a plurality of tubes in which the refrigerant flows, and being disposed to overlap at least partly with the first core portion in a flow direction of the subject-to-cooling fluid, a heat exchange being performed between another part of the subject-to-cooling fluid and another part of the refrigerant in the third core portion; a fourth core portion having a plurality of tubes in which the refrigerant flows, and being disposed to overlap at least partly with the second core portion in the flow direction of the subject-to-cooling fluid, a heat exchange is performed between a part of the subject-to-cooling fluid and a part of the refrigerant in the fourth core portion; a first collecting portion provided at refrigerant-downstream ends of the plurality of tubes of the first core portion, the refrigerant being collected in the first collecting portion after passing through the first core portion; a second collecting portion provided at refrigerant-downstream ends of the plurality of tubes of the second core portion, the refrigerant being collected in the second collecting portion after passing through the second core portion; a first distributing portion provided at a refrigerant-upstream end of the third core portion, the refrigerant being distributed from the first distributing portion to the plurality of tubes of the third core portion; a second distributing portion provided at a refrigerant-upstream end of the fourth core portion, the refrigerant being distributed from the second distributing portion to the plurality of tubes of the fourth core portion; and an intermediate tank unit having a first passage through which the first collecting portion and the second distributing portion communicate with each other, and a second passage through which the second collecting portion and the first distributing portion communicate with each other, wherein the intermediate tank unit extends along the first distributing portion, the second passage includes:
a throttle passage through which the refrigerant flows toward an end portion of the intermediate tank unit in an extending direction of the intermediate tank unit; andan end passage provided downstream of the throttle passage, the end passage having a cross-sectional area larger than that of the throttle passage with respect to a refrigerant flow in the throttle passage, and communicating with the first distributing portion, the first distributing portion is longer than the end passage in a flow direction of the refrigerant flowing in the throttle passage and extends adjacently to both the end passage and the throttle passage, and the throttle passage is directed toward a wall surface of the end portion in the end passage in the extending direction.