DRIVE SHAFT STRUCTURE, TURBO COMPRESSOR, AND TURBO REFRIGERATOR

摘要

PROBLEM TO BE SOLVED: To provide a drive shaft structure that prevents damage to a seal member during disassembly/assembly of a drive shaft and the seal member, a turbo compressor, and a turbo refrigerator.

SOLUTION: The drive shaft structure 40 includes: a drive shaft 41 for transmitting driving force; and a seal member 42b provided so as to closely contact with the outer-peripheral surface 41a of the drive shaft 41. The drive shaft 41 includes a second surface 41b located closer to the radial inside than the outer peripheral surface 41a. The second surface 41b has an index mark 41c used to confirm information regarding the rotation of the drive shaft 41 or information regarding the axial displacement of the drive shaft.

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