Centrifugal compressor

A centrifugal compressor comprising:

• a rotor including a shaft rotatably supported in a casing and an impeller secured to an outer periphery of the shaft;
• a diaphragm surrounding the impeller from an outer peripheral side;
• a suction side casing head disposed so as to be spaced apart from the diaphragm on a side where a fluid is suctioned;
• a temperature adjusting mechanism that is provided in the suction side casing head and configured to adjust a temperature of environment by flow of a heat medium;
• a heat shield that is provided between the suction side casing head and the diaphragm and defines, together with the impeller, a suction flow path through which the fluid is introduced to the impeller;
• and
• a plurality of straightening vanes that are provided in the suction flow path and configured to straighten the fluid flowing through the suction flow path,
• wherein even if the straightening vanes are displaced in a direction away from the heat shield, an interference state between the straightening vanes and the heat shield is maintained.