Bionic coupling noise elimination noise reduction spiral tougue

A volute tongue and noise reduction technology, which is applied to components of pumping devices for elastic fluids, non-variable pumps, machines/engines, etc., can solve the problems of complex processing, complex structure, and inconvenient wide application. Achieve the effect of simple processing and reduce eddy current shedding

Inactive Publication Date: 2009-08-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the existing patented technologies, CN00115736.1 discloses a "Designing Stepped Volute Tongue Noise Reduction on the Volute", which reduces the noise to a certain extent compared with its prior art, but does not silence the noise, and the processing process is complicated
PUB.NO.JP 6002699 Published discloses a noise reduction method of "installing a plate on the main volute tongue as an auxiliary volute tongue". This method needs to change the shape of the volute tongue or add auxiliary devices, and the structure is relatively complicated. The cost of mold design will increase, which is inconvenient for wide application

Method used

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  • Bionic coupling noise elimination noise reduction spiral tougue
  • Bionic coupling noise elimination noise reduction spiral tougue
  • Bionic coupling noise elimination noise reduction spiral tougue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]First measure the size of the fan volute tongue, determine the installation position of the bionic coupling noise reduction and noise reduction volute tongue, and then process the bionic coupling noise reduction volute tongue micro-slit plate layer 4 according to the measured size of the fan volute tongue, and the bionic coupling noise reduction volute tongue The thickness of the tongue micro-slit layer 4 is 1mm, the width of the micro-slit is 0.5mm, the center distance of the micro-slit is 4mm, and the opening rate is 3%. The vertical distance from the top of the curved surface of the micro-slit plate layer 4 to the micro-perforated plate layer 5 of the bionic coupling sound-absorbing volute tongue is the radius of the micro-slit plate layer 4 of the bionic coupling sound-absorbing volute tongue, and the length of the micro-perforated plate layer 5 of the bionic coupling sound-absorbing volute tongue is The diameter of the micro-slit plate layer 4 of the bionic coupling ...

Embodiment 2

[0038] First measure the size of the fan volute tongue, determine the installation position of the bionic coupling noise reduction and noise reduction volute tongue, and then process the bionic coupling noise reduction volute tongue micro-slit plate layer 4 according to the measured size of the fan volute tongue, and the bionic coupling noise reduction volute tongue The thickness of the tongue micro-slit layer 4 is 2mm, the width of the micro-slit is 0.5mm, the center distance of the micro-slit is 6mm, and the opening rate is 5%. The vertical distance from the top of the curved surface of the micro-slit plate layer 4 to the micro-perforated plate layer 5 of the bionic coupling sound-absorbing volute tongue is the radius of the micro-slit plate layer 4 of the bionic coupling sound-absorbing volute tongue, and the length of the micro-perforated plate layer 5 of the bionic coupling sound-absorbing volute tongue is The diameter of the micro-slit plate layer 4 of the bionic coupling...

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Abstract

The invention relates to a bionic coupling noise elimination volute tongue controlled by the aerodynamic noise of a centrifugal fan. The bionic coupling noise elimination volute tongue is arranged at a volute mouth of a volute casing. The bionic coupling noise elimination wolute tongue comprises a bionic coupling noise elimination volute tongue micro-gap ply, a bionic coupling noise elimination volute tongue micro-punch ply and an air chamber backing plate. A bionic coupling noise elimination volute tongue thin cavity layer is arranged between the bionic coupling noise elimination volute tongue micro-punch ply and the air chamber backing plate which is connected with the volute casing in a rivet welding way. The bionic coupling noise elimination volute tongue is simply processed and has the effects of sound absorption and noise reduction and rectification and noise reduction without needing changing the outline of the original fan volute casing. When air current flows through the surface of the bionic coupling noise elimination volute tongue, the bionic micro-gap ply contacted with the air current has the function of rectification and reducing the surface eddy shedding of the volute tongue. Experiments proves that the rotating speed of the fan selects the rotating speed of the working condition which is 1800r / min, for the original fan with higher noise lever, the noise can be reduced about by 3-5db (A), the noise reduction rate is 5%, for the original fan with lower noise lever, the noise can be reduced by 2-3db (A), and the noise reduction rate is 4.5%.

Description

technical field [0001] The invention relates to acoustics, engineering bionics and fluid machinery, in particular to an aerodynamic noise control device for a centrifugal fan. technical background [0002] Centrifugal fans and other high-speed rotating machinery will produce greater noise, which is caused by the impact, friction and other interactions between the moving parts and the environmental medium in contact with them. This kind of harmful noise can be transmitted through the medium and pollute the environment, such as blower, car water tank fan, air conditioner fan noise, etc. Therefore, reducing the start-up noise generated by rotating machinery such as centrifugal fans is of great significance for reducing noise pollution. [0003] Among the existing patented technologies, CN00115736.1 discloses a "Noise Reduction by Designing Stepped Volute Tongues on the Volute". This invention reduces the noise to a certain extent compared with its prior art, but it does not eli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/66F04D29/42
Inventor 任露泉刘庆平孙少明徐成宇周长海
Owner JILIN UNIV
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