| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal compressor capable of shortening processing time by providing an expanded part inside an air circulation passage in a shroud wall, and inhibiting occurrence of surging. SOLUTION: This centrifugal compressor 10 includes a rotatably supported impeller 12, and a shroud wall 14 extended from a periphery of the impeller 12 to an upstream side and forming a suction port 13. The shroud wall 14 includes a first opening part 21 provided at a section facing the impeller 12, a second opening part 22 provided at an outer circumference of an upstream suction port 13 displaced from an installation position of the impeller 12, and an air circulation passage 20 comprising a communication channel 23 connecting the first opening part 21 with the second opening part 22. The expanded part 23a with a section area expanded is formed in the communication channel 23. COPYRIGHT: (C)2010,JPO&INPIT
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