Noise reduction volute tongue structure and centrifugal fan

Abstract

The invention discloses a noise reduction volute tongue structure and a centrifugal fan. The volute tongue structure comprises a volute tongue body formed by a volute and a shell wall at the joint ofan air outlet, and a plurality of protruding blocks at the top of the volute tongue body, wherein the plurality of protruding blocks are sequentially distributed in the axis direction of the volute, and an airflow channel for airflow to pass through is arranged between every two adjacent protruding blocks. According to the noise reduction volute tongue structure and the centrifugal fan, the distance between the volute tongue and an impeller blade is reduced by the protruding blocks, so that the effect of reducing the continuous rotation of the airflow along with an impeller is achieved, the airflow is prevented from continuously circulating in a cavity part of the volute, and then the working efficiency of the centrifugal fan is improved; and gaps between the protruding blocks can be usedas the airflow channels, when the airflow leaves the tail end of the impeller blade, the impact of the outlet airflow on the volute tongue structure is reduced, the pressure gradient of the airflow near the volute tongue is reduced to a certain extent, the effective flow area of the airflow is increased, the superposition of noise in the volute tongue area is inhibited, and therefore the aerodynamic noise of the centrifugal fan can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of centrifugal fans, and in particular relates to a noise-reducing volute tongue and a centrifugal fan. Background technique [0002] Centrifugal fans often have a "tongue-like" structure formed by the shell wall at the connection between the volute and the air outlet, which is called a volute tongue. Such as figure 1 shown. [0003] The volute tongue structure directly interacts with the wake air flow of the rotating impeller in the volute, which can prevent the gas from circulating in the casing. It is directly related to the aerodynamic performance and noise characteristics of the centrifugal fan. During the working process of the fan, when each blade passes through the volute tongue, the airflow from the blade outlet will impact on the volute tongue at the same time, and the volute tongue bears a very large pulse force to generate rotational noise . The distance between the worm tongue and the edge o...

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a noise-reducing volute tongue and a centrifugal fan to solve the problem that the volute tongue structure in the existing centrifugal fan is difficult to coordinate efficiency and noise, so that the efficiency of the centrifugal fan is low and the noise increases The problem

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