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Sound absorption structure of volute and volute air inlet of noise reduction centrifugal fan

A technology of centrifugal fan and air inlet, which is applied in the direction of mechanical equipment, machine/engine, liquid fuel engine, etc. It can solve the problems of difficult calculation and limited noise reduction effect, so as to achieve safe and reliable structure, obvious sound absorption effect, and unique Secondary effect

Pending Publication Date: 2020-05-22
ANSHAN GANGFENG FAN
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AI Technical Summary

Problems solved by technology

However, the secondary vortex that appears inside the volute, especially near the volute tongue, is often very difficult to solve and calculate. Moreover, the structure design with fixed parameters is adopted for the volute with different pressures and flows, and the noise reduction effect is expected to change. very limited

Method used

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  • Sound absorption structure of volute and volute air inlet of noise reduction centrifugal fan
  • Sound absorption structure of volute and volute air inlet of noise reduction centrifugal fan
  • Sound absorption structure of volute and volute air inlet of noise reduction centrifugal fan

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the examples, but the implementation scope of the present invention is not limited only to the following examples.

[0037] Such as Figure 1-Figure 12 As shown, a sound-absorbing structure of a noise-reducing centrifugal fan volute and its air inlet, the sound-absorbing plate is fixed on the volute side plate 5 through the mounting plate 6, and a sound-absorbing plate is formed between the sound-absorbing plate and the volute side plate 5 Anechoic chamber; several web sound-absorbing panels 2 are evenly arranged horizontally and vertically on the volute web 1; several obliquely arranged arc-shaped guides are arranged on the arc-shaped side wall of the air inlet 7 of the volute piece.

[0038] Such as Figure 1-Figure 3 As shown, the sound-absorbing panels include two types: the sound-absorbing panel I4 and the sound-absorbing panel II3, and the sound-absorbing panel I4 and the sound-absorbing...

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Abstract

The invention relates to a sound absorption structure of a volute and volute air inlet of a noise reduction centrifugal fan. According to the sound absorption structure, a sound absorption plate is fixed to a volute side plate through a mounting plate, and a silencing cavity is formed between the sound absorption plate and the volute side plate; a plurality of web sound absorption plates are uniformly arranged on a volute web in the transverse and longitudinal directions; and a plurality of arc-shaped flow guide blocks which are obliquely arranged are arranged on the arc-shaped side wall of avolute air inlet. Compared with the prior art, the sound absorption structure has the following beneficial effects that the design of a spatial sound absorption structure is adopted, so that the effective sound absorption area is greatly increased, and the noise reduction effect is good; the structure is safe and reliable, and repeated maintenance and replacement are not needed in the service cycle; a sound absorption material has small influence on the performance of the fan, and the influence on the fan efficiency is less than 1%; and the sound absorption structure can be widely applied to ventilation and air supply industries with higher requirements on environmental comfort (low noise).

Description

technical field [0001] The invention relates to the field of large centrifugal fans, in particular to a noise-reducing centrifugal fan volute and a sound-absorbing structure for an air inlet thereof. Background technique [0002] The centrifugal fan uses the high-speed rotating impeller (centrifugal force) to do work on the gas medium. By changing the flow direction and flow speed of the medium, the kinetic energy of the medium is converted into potential energy (pressure energy). Fans are used in a wide range of fields, such as construction engineering, boilers, chemicals, petroleum and environmental protection industries, with promising application prospects. However, its working noise has always been "criticized" by everyone, mainly because this kind of noise seriously affects people's production and living comfort, and even endangers people's health. Therefore, fan noise has an impact that cannot be ignored. With the enhancement of people's awareness of environmental pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66F04D29/44F04D29/02
CPCF04D29/023F04D29/4213F04D29/4233F04D29/441F04D29/663F04D29/664F04D29/667
Inventor 王洪磊战阳
Owner ANSHAN GANGFENG FAN
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