Volute tongue, blower and exhaust hood

Abstract

The invention discloses a volute tongue. The volute tongue comprises a volute tongue support and a rotation part, wherein the rotation part can be rotationally arranged on the volute tongue support. Fluid which is guided on the volute tongue support is suitable for passing through the rotation part, and the rotation part is suitable for actively rotating or being driven by the fluid to rotate. According to the volute tongue in the embodiment, noise can be reduced.

Description

technical field [0001] The invention relates to the technical field of airflow drive, in particular to a volute tongue, a fan with the volute tongue and a range hood with the fan. Background technique [0002] In the range hood, the main function of the volute tongue of the fan used in the range hood is to intercept the flow (to prevent the impeller from idling and not to go out). Generally speaking, the volute tongue can be divided into sharp tongue, deep tongue, short tongue and flat tongue. For the traditional straight volute tongue, the deeper the volute tongue, the smaller the gap between it and the impeller, the efficiency is improved, but the noise is increased. In the related art, the volute tongue is a fixed structure, which is only fixedly installed at the beginning of the involute of the volute as a shut-off component. The disadvantage of this design is that the airflow hits the volute tongue without any cushioning, and the airflow hits the solid structure direct...

AI Technical Summary

Problems solved by technology

The disadvantage of this design is that the airflow hits the volute tongue without any cushioning, and the airflow hits the solid structure directly into noise

The eddy current noise cannot be effectively eliminated or weakened. In addition, the radius of the volute tongue can also be adjusted through an active control system, but it cannot be widely used in range hoods due to problems such as complex structure, high cost, and poor reliability.

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