| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal compressor and a turbocharger capable of reducing a manufacturing cost by manufacturing a structure of a shroud wall forming an air circulation passage in an inexpensive casting method.SOLUTION: A centrifugal compressor 10 includes an impeller 12 which is rotatably and pivotally supported, and a shroud wall 14 which extends to the upstream side from the circumference of the impeller 12 to form an inlet 13. The shroud wall 14 is provided with an air circulation passage 20 including a first opening 21 formed at a part opposing to the impeller 12, a second opening 22 formed in the outer circumferential part of the inlet 13 on the upstream side of a position of installation of the impeller 12, and a communication flow passage 23 for communicating the first opening 21 with the second opening 22. At least a part on the communication flow passage 23 side of an inner circumferential side wall 24 of the communication flow passage 23 in the shroud wall 14 is formed of an inner cylindrical member 26. |
