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Compound silencing device for air suction of high speed centrifugal fan

A technology of muffler and high-speed centrifugation, which is applied to the components of pumping devices for elastic fluid, mechanical equipment, non-variable-capacity pumps, etc. and other problems, to achieve the effect of anechoic frequency bandwidth, simple manufacturing process and simple structure

Pending Publication Date: 2020-09-11
NANJING CIGU TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing high-speed centrifugal fan inlet noise reduction technology has the following problems: 1. The noise reduction frequency band is narrow, the noise reduction is low, and the manufacturing process is complicated; 2. The high-frequency failure is serious. unable to effectively control

Method used

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  • Compound silencing device for air suction of high speed centrifugal fan
  • Compound silencing device for air suction of high speed centrifugal fan
  • Compound silencing device for air suction of high speed centrifugal fan

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Embodiment Construction

[0022] The present invention will be more clearly and completely described below by way of a preferred embodiment with reference to the accompanying drawings, but the present invention is not limited to the scope of the described embodiment.

[0023] like figure 1 Shown is a composite muffler for the air intake of a high-speed centrifugal fan provided by the present invention, including an inlet flange 1, a first expander 2, a second expander 3, a muffler 4, an upper end cover 5, The lower end cover 6 and the outlet flange 7; the small end of the first expander 2 is connected to the inlet flange 1, and the large end is connected to the upper end cover 5; the muffler device is fixed between the upper end cover 5 and the lower end cover 6; as figure 2 As shown, the muffler device includes a housing 9 and a muffler channel 8, the muffler channels 8 are arranged side by side in the housing 9, and the cross-sectional shape of the muffler channel 8 is a regular hexagon.

[0024] T...

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Abstract

The invention discloses a compound silencing device for air suction of a high speed centrifugal fan. The compound silencing device comprises an inlet flange, a first diverging tube, a second divergingtube, a silencing device, an upper end cover, a lower end cover and an outlet flange, wherein the small end of the first diverging tube is connected to the inlet flange and the large end of the firstdiverging tuber is connected to one surface of the upper end cover, the silencing device is mounted between the upper end cover and the lower end cover, the other surface of the lower end cover is connected to the large end of the second diverging tube, the small end of the second diverging tube is connected to the outlet flange, and the outlet flange is connected to an air inlet of the fan; thesilencing device comprises a silencing channel and a housing, the silencing channel is arranged in the housing and comprises a perforating plate, a surface cover layer and a sound absorption material,and the surface cover layer is located between the perforating plate and the sound absorption material. Based on expanding and resistant silencing principles, noises at low, intermediate and high frequency bands are eliminated effectively, and the silencing frequency band is wide. A high frequency failure problem of a conventional silencer is solved. The compound silencing device is simple in structure, simple in manufacturing process, easy to manufacture and convenient to maintain and mount.

Description

technical field [0001] The invention relates to the field of fan noise control, in particular to a composite noise reduction device for air intake of a high-speed centrifugal fan. Background technique [0002] High-speed centrifugal fans are widely used in medicine, environmental protection, chemical industry, petroleum and other industries. During the operation of the fan, there are mainly aerodynamic noise, mechanical noise, motor noise and basic vibration noise, and the noise presents a broadband characteristic, and the noise energy in the middle and high frequency bands is relatively high, and the intake noise mainly comes from the fundamental frequency of the fan impeller rotation. Noise and intake air pulsation sound, or a mixture of the two, the intake air pulsation sound is mainly low frequency, the intake air pulsation sound is mainly low frequency 125Hz, 500Hz, and 1000Hz octave bands are more prominent, causing people to be restless Heart abnormalities. The exis...

Claims

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Application Information

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IPC IPC(8): F04D29/66
CPCF04D29/663F04D29/664F04D29/667
Inventor 方健余知义吴立华董继勇
Owner NANJING CIGU TECH CORP LTD
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