Low-noise centrifugal ventilator casing

A centrifugal fan technology, applied in the direction of machines/engines, mechanical equipment, non-variable pumps, etc., can solve the problems of high cost, difficulty, and complexity, and achieve the effect of light weight, reduced use, and simple structure

Inactive Publication Date: 2013-04-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many noise reduction methods are relatively complicated to implement on site, and even involve the transformation of important fan structures. The cost is high, and it is very difficult to be widely used in actual fan noise reduction; One of the important issues in the working environment and the living environment of the surrounding residents

Method used

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  • Low-noise centrifugal ventilator casing
  • Low-noise centrifugal ventilator casing

Examples

Experimental program
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Effect test

Embodiment

[0012] Numerical simulation is used to calculate the noise of the measuring point of a certain centrifugal fan. The noise of the original fan model is about 83 dB. It is composed of 10mm acoustic wipe fabric, 30mm porous foam metal plate, 10mm outer sound-absorbing wipe fabric and 10mm carbon structural steel outer layer. The noise of the fan is reduced to 72 dB, and the noise reduction effect is very significant, which improves the working environment of operators.

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Abstract

The invention discloses a low-noise centrifugal ventilator casing belonging to the technical field of noise reduction for ventilators. The ventilator casing is formed by sequentially compositing a carbon structural steel inner layer, an inner-layer sound absorption plaster material, a porous foam metal plate, an outer-layer sound absorption plaster material and a carbon structural steel outer layer. The invention provides the low-noise casing which is simple in structure, light in weigh and good in noise reduction effect, and has certain stiffness. The amount of used metal materials is reduced, the cost is lowered, and the noise is reduced to about 10dB.

Description

technical field [0001] The invention belongs to the technical field of fan noise reduction, in particular to a low-noise centrifugal fan casing. Specifically, it is a centrifugal fan casing made of multi-layer noise-reducing materials. Background technique [0002] During the operation of the fan, the rotation, vortex, turbulence and mechanical vibration of the blades will generate noise. Large centrifugal fans generate a lot of noise during operation, and the noise of large centrifugal fans used in power stations is as high as about 100dB. Such high noise not only seriously affects the physical and mental health of operating personnel, but long-term work in such an environment may lead to deafness , and the disputes caused by the impact of fan noise on the work and life of surrounding residents are also increasing. At present, the noise reduction methods of fans are mostly focused on the transformation of the fan structure, such as installing deflectors at the inlet and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66F04D29/02B32B15/14B32B3/24
Inventor 李春曦叶学民尹攀李新颖
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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