| 主权项 |
1. A heat exchanger comprising:
at least one heat exchanger unit including a plurality of vertically arranged flat tubes, fins joined to the flat tubes, a first header collection pipe connected to one of ends of each of the flat tubes, and a second header collection pipe connected to the other end of each of the flat tubes, the heat exchanger unit being divided into a plurality of vertically arranged heat exchange regions, and the plurality of heat exchange regions being connected in series when the heat exchanger functions as an evaporator, the heat exchanger allowing a refrigerant flowing through the flat tubes and air to exchange heat, wherein each of the heat exchange regions is further divided into a plurality of vertically arranged heat exchange sections, communicating spaces each communicating with the plurality of flat tubes are formed in each of the first and second header collection pipes in a one-to-one relationship with the heat exchange sections, and in two of the heat exchange regions connected to each other when the heat exchanger functions as an evaporator, a downstream one of the heat exchange regions has the heat exchange sections not less than the heat exchange sections of an upstream one of the heat exchange regions, and a most downstream one of the heat exchange regions has more heat exchange sections than a most upstream one of the heat exchange regions. |
