主权项 |
1. A centrifugal compressor comprising:
an impeller; and a casing accommodating the impeller, wherein the casing includes:
an inlet;an impeller-accommodating portion, the impeller being disposed in the impeller-accommodating portion;an annular flow passageway formed around the impeller;an outlet communicating with the annular flow passageway; andan annular chamber formed around at least one of the inlet and the impeller-accommodating portion, and wherein an inner circumferential surface of the casing facing the impeller-accommodating portion is provided with a groove which communicates the impeller-accommodating portion and the annular chamber with each other and the groove is formed over an entire circumference of the inner circumferential surface, and the annular chamber communicates with another space only through the groove. |