Rotary compressor with silicon dioxide

A rotary compressor comprising:

• a vertically-positioned airtight compressor housing having an upper section in which a discharge portion of a refrigerant is provided and a lower section in which an inlet unit of the refrigerant is provided and lubricant oil is stored;
• a compressing unit that is disposed in the lower section of the compressor housing and that compresses the refrigerant sucked in via the inlet unit and discharges the refrigerant from the discharge portion;
• a motor that is disposed in the upper section of the compressor housing and drives the compressing unit via a rotation shaft;
• and
• an accumulator that is attached to a side section of the compressor housing and is connected to the inlet unit of the refrigerant, wherein
• copper ions are eluted from a refrigerant piping into the lubricant oil in the rotary compressor, and
• placed inside the accumulator and/or inside the compressor housing is,
• silicon dioxide having a crystal structure which contains a vacancy into which the copper ions become trapped, the vacancy having a diameter equal to or greater than a diameter of the copper ions and a diameter equal to or less than a diameter of a water molecule, or
• a composite which includes silicon dioxide having a crystal structure which contains a vacancy into which the copper ions become trapped, the vacancy having a diameter equal to or greater than a diameter of the copper ions and a diameter equal to or less than the diameter of the water molecule.