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Noise reduction volute tongue structure and centrifugal fan

A volute and noise volute technology, applied in the field of noise reduction volute and centrifugal fan, can solve the problems of low efficiency of centrifugal fan, difficulty in coordinating efficiency and noise, increase in noise, etc., so as to increase the effective flow area, suppress superposition, Impact reduction effect

Active Publication Date: 2020-11-27
华电章丘发电有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Noise reduction volute tongue structure and centrifugal fan
  • Noise reduction volute tongue structure and centrifugal fan
  • Noise reduction volute tongue structure and centrifugal fan

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Embodiment 1

[0033] This embodiment discloses a noise reduction volute tongue structure, such as image 3 As shown, the volute tongue structure includes a volute tongue body 31 formed by the shell wall at the junction of the volute case 1 and the air outlet 2 and a plurality of protrusions 32 arranged on the top of the volute tongue body 31 . The volute tongue body 31 in this embodiment is a relatively common volute tongue structure currently on the market. A plurality of protruding blocks 32 are distributed sequentially along the axial direction of the volute 1 , and an air flow channel 33 for air flow is provided between adjacent protruding blocks 32 . The setting of the protruding block 32 can effectively prevent the airflow from continuing to circulate inside the cavity, causing the loss of the flow rate and reducing the efficiency of the fan. At the same time, the setting of the airflow channel 33 can reduce the impact of the airflow on the volute tongue structure, effectively reducin...

Embodiment 2

[0041] This embodiment discloses a noise reduction centrifugal fan, such as figure 1 As shown, the centrifugal fan includes a volute 1, an air outlet 2, an impeller blade 4 and an impeller shaft arranged in the volute, and a volute tongue 3 is provided at the connection between the volute and the air outlet, and the volute tongue 3 is the embodiment 1 Documented noise-reducing cochlear tongue structure. The fixing positions of the first protruding piece 321 and the second protruding piece 322 in the volute tongue are set according to the dimensions and distances described in Embodiment 1.

[0042] The centrifugal fan of this embodiment is tested in actual engineering practice, and the test results show that, compared with the centrifugal fan with the traditional volute tongue structure, the noise of the centrifugal fan can be reduced by 100% when the outlet pressure and operating efficiency remain unchanged. 15-20dB; under the condition that the noise of the centrifugal fan i...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66
CPCF04D29/422F04D29/4226F04D29/661
Inventor 王承亮吴建勋盛虎王继松周海涛杜延伟武帅闫中前高勇陈永康张碧霄卢佳王琪李海平杨祖旺张轩谭厚科冯欣
Owner 华电章丘发电有限公司
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