A noise reduction volute tongue structure and a centrifugal fan

A centrifugal fan and noise reduction technology, which is applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of low efficiency of centrifugal fans, difficulty in coordinating efficiency with noise, and increased noise, so as to increase the effective flow area, The effect of suppressing stacking and reducing impact

Active Publication Date: 2022-06-07
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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  • A noise reduction volute tongue structure and a centrifugal fan
  • A noise reduction volute tongue structure and a centrifugal fan
  • A noise reduction volute tongue structure and a 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 connection between the volute case 1 and the air outlet 2 , and a plurality of protruding blocks 32 arranged on the top of the volute tongue body 31 . The volute-lingual body 31 in this embodiment is a relatively common volute-lingual structure on the market. A plurality of protruding blocks 32 are sequentially distributed along the axial direction of the volute 1 , and an airflow channel 33 for air to pass through is provided between adjacent protruding blocks 32 . The arrangement of the protruding blocks 32 can effectively prevent the airflow from continuing to circulate inside the cavity, resulting in a loss of flow rate and reducing the efficiency of the fan. The noise generated by the airflow impacting the volute 1.

[0034] Specifically, the protruding block 32 is a square blo...

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 3 is provided at the connection between the volute and the air outlet, and the volute 3 is Embodiment 1 Documented noise reduction volute tongue structure. The fixing positions of the first protruding block 321 and the second protruding block 322 in the volute tongue are set according to the dimensions and distances described in the first embodiment.

[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 and tongue structure, the noise of the centrifugal fan can be reduced under the condition that the outlet pressure and operating efficiency remain unchanged. 15 ~ 20dB; under the condition that the noise of the centrifugal...

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Abstract

The invention discloses a noise-reducing volute tongue structure and a centrifugal fan. The volute tongue structure includes a volute tongue body formed by the shell wall at the junction of the volute case and the air outlet, a plurality of protruding blocks on the top of the volute tongue body, and a plurality of The protruding blocks are distributed sequentially along the axial direction of the volute, and an air flow passage for air flow is provided between adjacent protruding blocks. The raised block of the present invention reduces the distance between the volute tongue and the blades of the impeller, which plays a role in reducing the continuous rotation of the airflow with the impeller, avoids the continuous circulation of the airflow in the cavity of the volute, and improves the working efficiency of the centrifugal fan; The gap between the blocks can be used as an airflow channel. When the airflow leaves the end of the impeller blade, it reduces the impact of the outlet airflow on the volute tongue structure, reduces the pressure gradient of the airflow near the volute tongue to a certain extent, increases the effective flow area of ​​the airflow, and suppresses the The superposition of noise in the volute tongue area can effectively reduce the aerodynamic noise of the centrifugal fan.

Description

technical field [0001] The invention belongs to the technical field of centrifugal fans, in particular to a noise reduction volute and a centrifugal fan. Background technique [0002] The centrifugal fan often has a "tongue-like" structure formed by the shell wall at the connection between its volute and the air outlet, which is called a volute tongue. like figure 1 shown. [0003] The volute tongue structure directly interacts with the airflow in the wake 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, each blade passes through the volute tongue, and the airflow at the outlet of the blade 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 volute tongue and the edge of the i...

Claims

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Application Information

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Patent Type & Authority Patents(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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