Novel multi-blade centrifugal fan

Abstract

The invention discloses a novel multi-blade centrifugal fan. The novel multi-blade centrifugal fan comprises a volute, a volute tongue and a plurality of fan blades fixed in the volute, wherein one lateral side of the volute tongue is fixed on the inner lateral side of the air outlet of the volute, the other lateral side of the volute tongue is a concave face, a plurality of air guide grooves are formed in the concave face, the two end faces of each fan blade are arc-shaped faces, a zigzag structure is arranged on one arc-shaped face of each fan blade, a bionic non-smooth structure is arranged on the other arc-shaped face of each fan blade, and airflow sequentially passes the bionic non-smooth structures and the zigzag structures and then is discharged from the air outlet of the volute. The novel multi-blade centrifugal fan has the advantages that the air quantity and air pressure of the fan are increased effectively, the noise of the fan is lowered effectively, and the efficiency of the fan is increased effectively.

Description

technical field [0001] The invention relates to a centrifugal fan, in particular to a novel multi-wing centrifugal fan. Background technique [0002] The multi-blade centrifugal fan has the characteristics of large flow coefficient, high pressure coefficient and compact structure, and has been widely used in industrial products. At present, most of the fans in the range hood industry use multi-blade centrifugal fans. In addition, they are also widely used in household in the air conditioner. The noise and efficiency of air conditioners and range hoods, which are closely related to people's lives, have become two performance indicators that have attracted much attention. The main causes of airflow noise include: first, the pressure pulsation on the surface of the blade caused by the turbulent boundary layer generated when the airflow passes through the blade surface; The resulting vortex shedding occurs at the trailing edge of the cochlear tongue, which increases the noise ...

AI Technical Summary

Problems solved by technology

However, since the surface of the volute tongue is flat, there is no special treatment. Due to the high flow velocity in the middle, the airflow in the middle and the airflow on both sides reach the volute tongue at the same time, resulting in the superposition of noise.

In addition, this volute tongue simply uses a straight volute tongue to carry out the concave rounding in the middle, so that the airflow in the concave part in the middle is reduced, but the vortex on both sides cannot be eliminated. Therefore, the improvement of the working efficiency of the fan is not ideal.

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