Heat exchanger and air conditioning device

A heat exchanger comprising:

• a plurality of flat tubes arranged in a mutually spaced arrangement;
• a header collecting tube connected to ends of the flat tubes, the header collection tube extending in a vertical direction;
• and
• a plurality of fins joined to the flat tubes,
• the header collecting tube having a loop structure including partition members partitioning internal spaces into first spaces where the flat tubes are connected, and second spaces disposed to a side opposite from where the flat tubes are connected to the first spaces,
• inflow ports located in lower parts of the first spaces, the inflow ports prompting inflow of refrigerant so as to give rise to an ascending flow within the first spaces when the heat exchanger functions as a refrigerant evaporator,
• upper communicating passages located in upper parts of the first spaces and the second spaces, the upper communicating passages providing communication between the upper parts of the first spaces and the second spaces in order to guide the refrigerant that has ascended within the first spaces into the second spaces, and
• lower communicating passages located in lower parts of the first spaces and the second spaces, the lower communicating passages providing communication between the lower parts of the first spaces and the second spaces, guiding the refrigerant in a direction other than a vertical direction from the second spaces towards spaces above the inflow ports in the first spaces in order to guide the refrigerant from the first spaces to the second spaces, and returning the refrigerant having descended through the second spaces from the second spaces to the first spaces.