Centrifugal compressor for surge suppression by adjusting the flow rate and shifting the impeller axially

摘要

The centrifugal compressor (22) for the chiller (10) includes a casing (30), an inlet guide vane (32), an impeller (34) downstream of the inlet guide vane (32), a motor (38), and a diffuser. (36). The casing (30) has an inlet part (31a) and an outlet part (31b), and an inlet guide vane (32) is arranged in the inlet part (31a). The impeller (34) is rotatable about a rotation axis that defines an axial direction, and the impeller (34) is a casing (30) along the axial direction at least between the first flow rate position and the second flow rate position. It is provided in an adjustable manner. The motor (38) rotates the impeller (34). The diffuser (36) is disposed in the outlet part (31b) downstream of the impeller (34), and the outlet port (37) of the outlet part (31b) is located between the impeller (34) and the diffuser (36). ing.