Centrifugal fan with adjustable air inlet

The utility model discloses a centrifugal fan with an adjustable air inlet. The centrifugal fan with the adjustable air inlet comprises a volute and an impeller installed in the volute, wherein an air inlet ring is arranged at the position of the air inlet end face of the impeller. The centrifugal fan is characterized in that the air inlet ring can be an irregular-shaped air inlet ring capable of rotating on the plane of the air inlet under the driving of a driving mechanism, and the shape of the air inlet is correspondingly changed along with rotation of the irregular-shaped air inlet ring and meets the air inlet requirements of the fan in different outlet pressure environments. Compared with the prior art, the centrifugal fan has the advantages that the centrifugal fan with the adjustable air inlet is provided with the irregular-shaped air inlet ring capable of rotating on the plane of the air inlet under the driving of the driving mechanism, and the shape of the air inlet can be adjusted after the irregular-shaped air inlet ring rotates, so that the shape of the air inlet meets the inlet requirements of the fan in different outlet pressure environments, and the effects of increasing flow in an outlet low-pressure environment and decreasing backflow in an outlet high-pressure environment are achieved.