Impeller assembly for centrifugal fan

Abstract

The invention discloses an impeller assembly for a centrifugal fan. A middle disc is included. The impeller assembly has the axis. The middle disc has the center and comprises a wheel disc installingpart located in the middle, a connecting part located on the periphery of the wheel disc installing part and a blade installing part located on the periphery of the connecting part, and the blade installing part is provided with blade inserting grooves. The impeller assembly is characterized in that the wheel disc installing part integrally protrudes in the axis direction relative to the connecting position with the connecting part, the protruding height is H2, and H2 is larger than or equal to 2 and smaller than or equal to 10 mm. Compared with the prior art, the impeller assembly has the advantages that by adoption of shallow profiling, the impeller center air inlet space can be enlarged, flow resistance is reduced, few materials are used for shallow profiling, and cost can be reduced; and due to forward and reverse profiling, the problems about flat plate poor rigidity and unevenness can be solved; and due to regular and orderly ventilation holes, the adaptation degree of differentfront and back air inlet proportions under different work conditions can be better achieved, and the air inlet proportion is automatically balanced.

Description

technical field [0001] The invention relates to power equipment, in particular to an impeller assembly for a centrifugal fan. Background technique [0002] Centrifugal fans, relying on the input mechanical energy, use the high-speed rotating impeller to accelerate the gas entering the impeller in the axial direction, then decelerate, change direction, flow out of the impeller radially, and finally exit through the air outlet of the volute. The air volume and air pressure of the multi-blade centrifugal impeller is high, and the small impeller outlet diameter can achieve large air volume and air pressure, low speed and low noise, and is often used in range hoods, suction and exhaust and other fields. [0003] At present, the double-suction impeller is mainly composed of front and rear end rings, a middle plate and uniformly distributed blades around the ring. For example, the Chinese patent application number 201710305931.6 discloses an impeller for range hoods, including a f...

AI Technical Summary

Problems solved by technology

[0004] In this kind of existing impeller, the center plate mostly adopts the structure of the deep-pressure type with bosses. The higher the stretch of the bosses, the more material loss, and it will occupy the air inlet space in the center of the impeller, and it is easy to cause circumferential quality during the forming process. Uneven, resulting in poor dynamic balance of the impeller

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