Compressor and refrigeration cycle apparatus

A refrigeration cycle apparatus comprising:

• a refrigerant circuit including a compressor, an outdoor heat exchanger being configured to serve as a condenser during cooling, and an expansion mechanism, the outdoor heat exchanger and the expansion mechanism being connected by at least one pipe, the compressor including a first member and a second member, the first member formed of a base metal, the base metal being steel, the first member including a first contact portion, the second member including a second contact portion configured to be in contact with the first contact portion of the first member in a slidable manner;
• a refrigerant mixture inclusive of 1,1,2-trifluoroethylene and used in the refrigerant circuit;
• and
• a refrigerating machine oil that is free of phosphoric ester in the refrigerant circuit, and includes 2% or more by weight of an acid scavenger,
• wherein the base metal of the first member of the compressor is exposed at the first contact portion of the first member,
• the outdoor heat exchanger includes a refrigerant flow path configured such that the refrigerant mixture flows through the refrigerant flow path,
• an expanded pipe portion is one of the at least one pipe, the expanded pipe portion starts at an outlet of the outdoor heat exchanger configured to serve as the condenser, ends at an inlet of the expansion mechanism, and extends an entire length of the at least one pipe between the outlet and the inlet, the expanded pipe portion having a greater flow path cross-section from the outlet of the outdoor heat exchanger to the inlet of the expansion mechanism, than a first refrigerant flow path, the first refrigerant flow path being defined as a portion from an inlet of the refrigerant flow path of the refrigerant mixture to 50% of a total length of the refrigerant flow path, the at least one pipe being included in a second refrigerant flow path, the second refrigerant flow path being defined as a portion of the refrigerant flow path downstream of the first refrigerant flow path in a refrigerant mixture flow direction, and
• the expanded pipe portion is disposed downstream of the first refrigerant flow path of the outdoor heat exchanger configured to serve as the condenser.