Patent ID: 7563081

Claim:
A gas compressor, comprising: a housing formed with a suction port and a discharge port, a partition wall member disposed in the housing and configured to define a suction chamber communicating with the suction port, and a gas-compressing mechanism housed in the housing on a side of the housing opposite to the suction chamber and adapted to compress a gas sucked through the suction port and to discharge the compressed gas through the discharge port, said gas-compressing mechanism comprising a cylinder, said cylinder including a wall which defines a cylinder chamber having a circular or elliptical cross-sectional shape, said cylinder being provided with a suction inlet for sucking the gas to be compressed into the cylinder chamber and a discharge outlet adapted for discharging the compressed gas from the cylinder chamber, said suction inlet and said discharge outlet being opened in a peripheral wall of the cylinder chamber, a discharge passage extending along a center axis of the cylinder chamber, a suction passage formed in the partition wall member along an outer periphery of the discharge passage and including a first passage portion and a second passage portion, wherein the suction passage is provided in a lower portion of the partition wall member, said suction inlet communicating with the suction port via the suction passage, said discharge outlet communicating with a peripheral wall of the discharge passage and communicating with the discharge port via the discharge passage, said suction inlet communicating with the cylinder chamber, said discharge outlet communicating with the cylinder chamber, wherein said discharge passage, which communicates with the discharge outlet, is provided in the cylinder, wherein said discharge passage is formed completely within the wall of the cylinder so that the discharge passage extends through the cylinder from one end of the cylinder to another end thereof along a central axis of the cylinder chamber.