Scroll compressor for carbon dioxide supplied with a lubricant

A scroll compressor comprising a spiral lap of a fixed scroll part and a spiral lap of a turning scroll part which are meshed with each other to form a compression chamber, a rotation-restraining mechanism which restrains said turning scroll part from rotating to turn the turning scroll part along a circular orbit, a compression chamber formed between the spiral lap of said fixed scroll part and the spiral lap of said turning scroll part which moves while changing a volume of said compression chamber, thereby compressing sucked refrigerant and discharging the refrigerant, wherein carbon dioxide is used as said refrigerant,

• wherein said turning scroll part comprises a communication passage provided in the turning scroll part, and a throttle hole through which lubricant flows to a back pressure chamber adjusted to said turning scroll part, said back pressure chamber at least intermittently communicating with said sucked refrigerant,
• wherein a diameter of said throttle hole is adjusted such that an amount of the lubricant supplied into said compression chamber is set to a ratio of 2% by weight or more and less than 20% by weight of an amount of the lubricant to the refrigerant trapped in said compression chamber when a suction stroke of said refrigerant is completed.