CN216487283U

CN216487283U - Impedance composite noise suppression structure for large-flow high-speed air duct

Info

Publication number: CN216487283U
Application number: CN202122687082.XU
Authority: CN
Inventors: 魏东超; 李涛
Original assignee: Bomesc Offshore Engineering Co Ltd
Current assignee: Bomesc Offshore Engineering Co Ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-05-10
Anticipated expiration: 2031-11-04

Abstract

The utility model discloses a high-flow high-speed air duct impedance composite noise suppression structure which comprises an expansion chamber, a V-shaped perforated plate, a vertical perforated plate and a wedge-shaped sound-absorbing cotton block, wherein the expansion chamber is connected with an air inlet duct and an air outlet duct, the outer side of the expansion chamber is wrapped by a layer of sound-absorbing cotton, the V-shaped perforated plate and the vertical perforated plate in the expansion chamber form two resonant cavities, and energy of vibration of wind is consumed through multiple reflection and collision of wind. The utility model realizes vibration and noise reduction of the high-flow high-speed air duct, improves the effect of inhibiting the noise of the high-flow air duct, and weakens the harm of the noise to operators and the influence on work.

Description

Impedance composite noise suppression structure for large-flow high-speed air duct

Technical Field

The utility model relates to a noise reduction structure of a heating ventilation air conditioner, in particular to a high-flow high-speed air duct impedance composite noise suppression structure.

Background

The medium flow in the air duct is usually unstable, and although the air duct cavity has the function of stabilizing the medium flow in the air duct, certain pulsation is generated, so that vibration of the air duct is easily caused, and noise is generated in the air duct. The structure of the noise reduction device of most of the existing large-flow air channels is as follows: the noise suppression effect is relatively limited by utilizing the resistance of resonance in the expansion chamber or utilizing the resistance of the sound absorption material.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a high-flow high-speed air duct impedance composite noise suppression structure which can better meet the noise reduction requirement of a high-flow air duct.

In order to realize the purpose, the utility model adopts the technical scheme that:

the utility model relates to a high-flow high-speed air duct impedance composite noise suppression structure, which comprises an expansion chamber, wherein soundproof cotton is wrapped on the outer wall of the expansion chamber, the air inlet side of the expansion chamber is connected with an air inlet duct through a bolt and a nut, the air outlet side of the expansion chamber is connected with an air outlet duct through a bolt and a nut, a vertical perforated plate is fixed in the middle of the expansion chamber along the vertical direction to divide the expansion chamber into a left chamber and a right chamber which are independent of each other, a V-shaped perforated plate is installed in the left chamber, the opening of the V-shaped perforated plate faces the air inlet duct, the upper end and the lower end of the V-shaped perforated plate are respectively and fixedly connected with the upper side and the lower side of the left end of the left chamber, the tip of the V-shaped perforated plate is fixedly connected with the vertical perforated plate, an upper resonant cavity and a lower resonant cavity are formed among the vertical perforated plate, the V-shaped perforated plate and the outer wall of the left chamber, and sound absorption cotton blocks are respectively fixed on the top wall and the bottom wall in the right chamber, inhale the cotton piece of sound be the wedge, two inclined planes of inhaling the cotton piece of sound from top to bottom incline towards the central horizontal plane direction of expansion chamber from vertical perforated plate to air outlet flue direction.

The utility model realizes vibration and noise reduction of the high-flow high-speed air duct, improves the suppression effect on the noise of the high-flow air duct, and weakens the influence of the noise on operating personnel.

Drawings

FIG. 1 is a schematic view of a structure for suppressing noise in a high flow rate and high speed air duct according to the present invention;

FIG. 2 is a schematic structural diagram of a noise suppressing structure of a high flow rate and high speed air duct according to the present invention;

fig. 3 is a schematic view of the working principle of the expansion chamber in the structure shown in fig. 2.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments.

As shown in the attached drawing, the impedance composite noise suppression structure of the large-flow high-speed air channel comprises an expansion chamber 4, wherein sound insulation cotton 5 is wrapped on the outer wall of the expansion chamber 4. The air inlet side of the expansion chamber 4 is connected with the air inlet channel 1 through bolts and nuts, and the air outlet side of the expansion chamber 4 is connected with the air outlet channel 7 through bolts and nuts. Expansion chamber 4 in the middle of along vertical direction be fixed with a vertical perforated plate 3 and separate expansion chamber 4 for independent left room and right room each other the left side indoor install a V-arrangement perforated

plate

2, 2 openings of V-arrangement perforated plate respectively with the left side of the left side both sides fixed link to each other about air inlet duct 1 and the upper and lower tip, the most advanced of V-arrangement perforated plate and vertical perforated plate 3 fixed link to each other. And an upper resonant cavity and a lower resonant cavity are formed among the vertical porous plate 3, the V-shaped porous plate and the outer wall of the left chamber.

The cotton piece 6 of inhaling the sound is fixed with respectively on roof and the diapire in the right side indoor, the cotton piece 6 of inhaling the sound be the wedge, two upper and lower inclined planes of inhaling the cotton piece 6 of sound are followed vertical perforated plate 3 to 7 directions of exhaust passage and are towards the central horizontal plane direction slope of expansion chamber 4.

The working principle of the device is as follows:

after entering the expansion chamber 4 through the air inlet duct 1, high-speed large-flow wind respectively enters an upper resonant cavity and a lower resonant cavity formed by the V-shaped porous plate 2 and the porous plate 3 through two halves of the V-shaped porous plate 2, and is converged through the vertical porous plate 3 after being reflected for multiple times in the resonant cavities, and the multiple reflections in the resonant cavities and the collision of the converged wind consume energy of the vibration of the wind to weaken noise. The inclined plane formed by the wedge-shaped sound absorption cotton block 6 avoids the vibration generated by the direct impact of wind on the windward wall surface and can absorb part of noise. The soundproof cotton 5 wrapped outside the expansion chamber 4 weakens the noise transmitted by the vibration of the air duct wall, and plays the effects of vibration reduction and noise reduction.

Claims

1. The utility model provides a large-traffic high-speed wind channel impedance composite noise restraines structure which characterized in that: including the expansion chamber the outer wall of expansion chamber on the parcel have soundproof cotton, the air inlet side of expansion chamber links to each other with the air inlet duct through bolt and nut, the play wind side of expansion chamber passes through bolt and nut and goes out the wind channel link to each other expansion chamber in the middle of be fixed with a vertical perforated plate along vertical direction and separate the expansion chamber for independent left room and right room each other the left room in install a V-arrangement perforated plate, V-arrangement perforated plate opening towards air inlet duct and upper and lower tip do not link to each other with the upper and lower both sides of left room left end are fixed, the pointed end of V-arrangement perforated plate link to each other with vertical perforated plate is fixed, vertical perforated plate, V-arrangement perforated plate and left room's outer wall between constitute two upper and lower resonant cavities the right indoor roof and diapire of inhaling the sound cotton piece on be fixed with respectively, inhale the sound cotton piece and be the wedge, two horizontal plane inclined planes of inhaling the sound cotton piece from vertical perforated plate to play wind channel direction towards the center direction slope of expansion chamber .