Compressor having concentrically walled damper

A compressor comprising:

• a housing having at least one compression chamber, a suction chamber, and a discharge chamber;
• a compression mechanism including a drive shaft and members movable with said drive shaft to cause a gas to be sucked from said suction chamber, compressed in said compression chamber, and discharged into said discharge chamber;
• a valve device arranged between said suction chamber and said compression chamber;
• a gas passage connected to said suction chamber;
• and
• a damping device arranged in said gas passage for damping compression waves transmitted from a vibration source by a gas in the gas passage, said damping device comprising at least one passage component, said passage component comprising:
• a first cylindrical wall defining a first passage portion therein;
• a second cylindrical wall arranged outside and parallel to said first cylindrical wall, said first and second cylindrical walls defining a second passage portion between them;
• a closure wall closing one end of said first passage portion and a corresponding end of said second passage portion;
• and
• a third passage portion arranged near said closure wall and connecting said first passage portion to said second passage portion;
• wherein said first passage portion is located on the upstream side of said second passage portion with respect to the transmitting direction of compression waves from said vibration source, and a cross-sectional area of said second passage portion is greater than a cross-sectional area of said first passage portion.