Multi-air conditioner capable of performing simultaneous cooling and heating

A multi-air conditioner capable of simultaneous cooling and heating, comprising:.

• an outdoor unit having therein a compressor and an outdoor heat exchanger;
• a plurality of indoor units, each having therein an electronic expansion valve and an indoor heat exchanger;
• a distributor provided between the outdoor unit and the indoor unit and distributing a refrigerant introduced from the outdoor unit to the plurality of indoor units;
• a duct unit including a first duct connecting the distributor to a discharge side of the compressor, having the outdoor heat exchanger in the middle and guiding a refrigerant discharged from the compressor toward the indoor heat exchanger, and a second duct diverged from the first duct, connected to the distributor and guiding a refrigerant discharged from the compressor toward the indoor heat exchanger;
• and
• an oil accumulation portion formed to have a height difference at a certain section of the second duct in order to prevent oil, which is introduced to the second duct from the compressor together with a refrigerant, from being accumulated within the second duct.