| 摘要 |
PROBLEM TO BE SOLVED: To provide a small chord-pitch ratio diffuser capable of keeping the effect of secondary flow of the small chord-pitch ratio diffuser, suppressing separation of guide vanes near a blade wall surface, and further suppressing generation of surging, generation of noise due to interference of a centrifugal impeller with the guide vanes, and generation of stall in revolution, and to provide a centrifugal compressor and a blower including the diffuser.SOLUTION: In a diffuser 4, a flow channel of a fluid sent from a centrifugal impeller 2 is formed between two side walls 4a and 4b, a plurality of guide vanes 5 for rectifying the fluid flowing in the flow channel, are formed to have a small chord-pitch ratio, and front edge portions 5a of the guide vanes 5 are disposed separately from a peripheral edge portion 2a of the centrifugal impeller 2. The guide vanes 5 are provided with extending portions 6 extending toward the peripheral edge portion 2a of the centrifugal impeller 2 from a side of the front edge portions 5 while connected with one of the side walls 4a and 4b. A centrifugal compressor 1 or a blower includes the diffuser 4. |
