| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger that enables a heat-exchange medium to flow in such a direction as to reduce flow passage resistance of a heat-exchange flow passage, and enables the heat-exchange medium to flow uniformly through plural laminated heat-exchange tubes.SOLUTION: In a heat-exchange flow passage of a heat-exchange tube 12, a refrigerant flows from one-side side edge portion 244 to an other-side side edge portion 245. Accordingly, the a flow passage cross-sectional area of the whole plural heat-exchange flow passages is increased, and thereby a refrigerant can be made to flow in such a direction as to reduce flow passage resistance of the heat-exchange flow passage at a tube intermediate portion 24. Furthermore, a throttle portion 251 of an entrance communication portion 25 throttles refrigerant flow from an entrance portion 20 and then makes the refrigerant flow to the one-side side edge portion 244 of the tube intermediate portion 24, so that the flow passage resistance can be easily applied to a flow-in side to the heat-exchange flow passage in conformity with the reduced flow passage resistance of the heat-exchange flow passage. Therefore, the refrigerant can be made to uniformly flow through the plural heat-exchange tubes 12.SELECTED DRAWING: Figure 4 |
