| 摘要 |
A compressor (140) comprising a housing having an axial intake defining an intake passage and an annular outlet volute defining an annular outlet volute passage, an impeller (145) mounted on a shaft for rotation about a shaft axis between the axial intake and the annular outlet volute, the impeller having a plurality of blades, a diffuser defining an annular diffuser passage surrounding the impeller, the annular diffuser passage having a diffuser inlet downstream of said plurality of blades, the tips of the blades sweeping across said diffuser inlet during use, and a diffuser outlet communicating with the annular outlet volute passage, the annular diffuser passage being defined by first and second radially extending surfaces, wherein the compressor further comprises at least two vane members (134, 135), each vane member having at least one vane (127, 128) arranged to be receivable in the diffuser passage and an actuator (158) is coupled to the at least two vane members so as to move each vane member such that the axial length of it's at least one vane within the diffuser passage is varied. |
