Patent ID: 8721309

Claim:
An airtight compressor comprising: an airtight container having an airtight space with a gas retention space in which a compressed gas medium is temporarily retained in an upper part of the airtight space; a compression mechanism disposed inside the airtight container in a position below the gas retention space, the compression mechanism having an intake chamber as a first space, and a second space partitioned from the intake chamber by a seal surface of a piston and that is located on an opposite side of the piston from the intake chamber, the compression mechanism being arranged to compress the gas medium in the intake chamber and then to expel the gas medium to the gas retention space; an oil reservoir disposed inside the airtight container in a position below the compression mechanism, the oil reservoir being arranged to retain oil used to lubricate the compression mechanism; an oil supply passage arranged to supply the oil from the oil reservoir both to the gas retention space and to a sliding portion of the compression mechanism in the second space, and to communicate the gas retention space and the second space; and a second channel which is a channel that is different from the oil supply passage, the second channel being arranged to enable the gas medium to flow from the gas retention space to the second space, a passage resistance when the gas medium flows through the second channel is less than a passage resistance when the gas medium flows through the oil supply passage.