To provide a highly reliable multicylinder compressor not having the thermal effect in welding of the gas-liquid separator on the compression mechanism part, so as to solve problems that, when a gas-liquid separator is welded in a two-cylinder compressor, a connection pipe and a connection outer pipe are expanded or contracted caused by thermal effect to give excessive load on a compression mechanism part, thereby resulting in mechanical distortion and eccentricity to deteriorate the performance and lower the reliability.
Upper and lower connection pipes 6 or the lower connection pipe 6 have/has a press-fit part(s) with smaller outer diameter at a certain distance from a tip. Even if displacement of the connection pipe is generated because of expansion and contraction in a length direction in the welding, its contact length with a suction port is kept to be constant, variation in press-fit load in assembly is suppressed, and increase in load caused by the thermal effect is avoided.
MATSUNAGA HIROSHI
Tomoyasu Sakaguchi
Hiroki Naito