An impeller with a bevelled blade top structure and a shallow volute centrifugal fan using the same

Abstract

The present application relates to the technical field of centrifugal fan, especially relates to a impeller with bevelled blade top structure and a shallow volute tongue centrifugal fan using the same, wherein the centrifugal fan is optimized through the "shallow volute tongue structure + impeller bevelled design", and solves the technical problems of air flow backflow at the volute tongue, sharp increase of noise, deformation and distortion of flow channel, deterioration of fan performance and the like under high speed of the centrifugal fan of the mobile air conditioner in the background technology. The shallow volute tongue centrifugal fan is designed according to specific steps, the radius, the circumferential angle and the length of each arc segment are precisely controlled, the air outlet trajectory of the impeller is fitted, the backflow and vortex are reduced; the blades of the impeller are bevelled, the air inlet area is increased, the rotating speed under the same air volume is reduced, the air inlet capacity difference of different parts of the blade is reduced, the air outlet imbalance problem is reduced, the clearance between the volute and the impeller is optimized, the air volume and the fan efficiency are improved, and the noise is significantly reduced.

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