Compressor and refrigeration apparatus

A compressor comprising:

• a casing having an internal space, the internal space including a first space and a second space;
• a motor that includes a stator having a cylindrical shape, a rotor in the stator, a refrigerant descending passage, and a refrigerant ascending passage, the motor being in the internal space;
• a compression mechanism in the first space, the first space being between the compression mechanism and the motor, the compression mechanism being configured to compress a refrigerant;
• an oil reservoir in the second space, the second space being between the oil reservoir and the motor;
• a crankshaft configured to transmit rotation of the rotor to the compression mechanism;
• a rotary member in the second space, the rotary member being configured to rotate together with the rotor and having an outer diameter larger than an inner diameter of the stator;
• and
• a discharge pipe in the first space,
• wherein the refrigerant descending passage provides a flow path for the refrigerant to pass from the first space to the second space, and
• wherein the refrigerant ascending passage provides a flow path for the refrigerant to pass from the second space to the first space.