MULTISTAGE COMPRESSOR

PROBLEM TO BE SOLVED: To provide a multistage compressor that secures withstanding pressure intensity while reducing the thickness of a discharge pipe system as much as possible and reduces the risk of gas leakage even when a high-pressure refrigerant like a CO2 refrigerant is used.SOLUTION: A low-stage compression mechanism and a high-stage compression mechanism are provided in a sealed housing 10. The low-stage compression mechanism compresses the low-pressure gas to middle pressure. The high-stage compression mechanism compresses the middle pressure gas to high pressure in two stages, and discharges it into a chamber. The high-pressure gas in the discharge chamber is discharged out via a connector pipe 47 and a discharge pipe 43 which pass through the sealed housing 10. In the multistage compressor where the interior of the sealed housing 10 is a middle pressure atmosphere, the connector pipe 47 is provided in an outer pipe 49 which passes through the sealed housing 10. The connection part between the connector pipe 47 and a discharge pipe 43 is provided on the inner side than the outer end of the outer pipe 49.