Centrifugal compressor

A centrifugal compressor comprising:

• a rotary shaft;
• a compression mechanism that compresses fluid with rotation of the rotary shaft;
• a motor that rotates the rotary shaft;
• an inverter that drives the motor;
• a housing in which the motor, the compression mechanism, and the inverter arranged in this order in an axial direction of the rotary shaft are accommodated;
• and
• a wiring unit through which the motor and the inverter are electrically connected to each other,
• the compression mechanism including:
• an impeller that rotates integrally with the rotary shaft;
• a suction chamber that is located closer to the inverter than the impeller in the axial direction;
• a diffuser that is disposed downstream of the impeller in a direction in which the fluid flows;
• and
• a volute that communicates with an outlet of the diffuser and is located outward with respect to the diffuser in a radial direction of the rotary shaft, wherein
• the housing has:
• a motor housing member in which the motor is accommodated;
• an impeller housing member in which the impeller is accommodated and that defines the diffuser and the volute;
• a suction housing member that defines the suction chamber;
• and
• an inverter housing member in which the inverter is accommodated,
• the motor housing member, the impeller housing member, the suction housing member, and the inverter housing member are arranged in this order in the axial direction,
• the housing has a through hole that extends in the axial direction to an inside of the inverter housing member from the motor housing member through the impeller housing member and the suction housing member,
• the wiring unit is disposed in the housing and inserted in the through hole,
• the through hole is disposed away from the volute, and
• a suction passage through which the suction chamber is connected to an outside of the housing is located away from the through hole in a circumferential direction of the rotary shaft.