CN201347784Y

CN201347784Y - Silencer with acoustic wedge

Info

Publication number: CN201347784Y
Application number: CNU2008202235124U
Authority: CN
Inventors: 周代莹; 李德宏
Original assignee: SICHUAN KENTPHK-ENLIER Ltd
Current assignee: SICHUAN KENTPHK-ENLIER Ltd
Priority date: 2008-12-18
Filing date: 2008-12-18
Publication date: 2009-11-18
Anticipated expiration: 2018-12-18

Abstract

A silencer with acoustic wedge belongs to a noise controlling component and aims at solving the problems that an existing industrial silencer does not have an acoustic wedge, the noise silencing amount is small, and the adapted noise frequency is not wide. The silencer comprises a shell which is respectively provided with a sound inlet and a sound outlet on two ends, wherein acoustic wedges are arranged in the shell, the acoustic wedges are in pyramid shapes with sealing plates on one side, perforated plates are connected with the sealing plates, first noise absorbing materials are arranged in the other surfaces which are connected with the sealing plate, second noise absorbing materials are arranged in the pyramid space of the acoustic wedges, the shell is in a drum shape with a convex middle part, two ends are respectively connected with flanges through connecting pipes, a plurality of acoustic wedges with different lengths, different thicknesses and different closed angles are arranged in the shell, and the length of each acoustic wedge is one fourth of the sound wave length of to-be-controlled noise. The silencer with acoustic wedge has wide adapted frequency and can realize the purpose of wide adapted noise frequency only through using the acoustic wedges.

Description

Silencing apparatus with wedge absorber

Technical field

The utility model belongs to a kind of noise abatement device, particularly a kind of silencing apparatus.

Background technique

Wedge absorber is that a kind of effective noise is administered element, when its length be wave length of sound 1/4 the time, its acoustic absorptivity can reach more than 0.98, it is present more than a times of other sound absorbing element, because the wedge absorber manufacture difficulty is big, it is big to take up room, and only uses in experiment is eliminated the noise in the sound absorption of noise research.

The silencing apparatus of industrial application is that the reactive muffler of adaptation medium and low frequency noise or the dissipative muffler that adapts to medium-high frequency all do not have Wedge structure and use wedge absorber.

The model utility content

The purpose of this utility model is to solve that existing industrial silencing apparatus does not have wedge absorber and sound deadening capacity is little, adapt to the not wide problem of noise frequency, a kind of improved silencing apparatus with wedge absorber is provided, can absorb more acoustic energy, the noise of different wave length is absorbed, makes acoustic wave filter structure compacter.

The purpose of this utility model realizes by following technical proposals:

Silencing apparatus with wedge absorber comprises that two ends are respectively arranged with the housing of voice entry and sound outlet, are provided with wedge absorber in the described housing.

Described wedge absorber is pyramid shape, and one side is a shrouding, and what be connected with shrouding has a perforated plate, and is provided with first sound-absorbing material in the another side that shrouding is connected, is provided with second sound-absorbing material in the pyramid space of wedge absorber.

Described housing is the cydariform that protrude at the middle part, and two ends are connected with flange by taking over respectively.

Be provided with the wedge absorber of several different lengths, different-thickness, different wedge angles in the described housing.

The length of described wedge absorber is administered 1/4 of noise wave length of sound.

The utility model adopts said structure, wedge absorber in the silencing apparatus constitutes air-flow path, air flows produces the aerodynamic noise, noise waves makes that air column statuary column plug equally vibrates in the hole on the wedge absorber perforated plate, air and hole wall friction are converted into heat energy dissipation with acoustic energy and fall, the routine once more sound-absorbing material vibration of the sound wave that is attenuated is further decayed; When the length of wedge absorber be wavelength 1/4 the time, sound wave and these vibration resonances, decay is maximum, acoustically effective is best; The spatial area that wedge absorber is surrounded in suppressor case is in continuous variation, air is at continuous dilatation or capacity reducing, vertical dilatational wave of air is constantly decayed, spatial volume in the wedge absorber also is stepless variation, the horizontal dilatational wave that is absorbed also constantly is attenuated, just sound wave has been disappeared, because the area of the volume of air flow in the wedge absorber also is stepless variation, so the sound wave of each wavelength all can be absorbed decay, thereby silencing apparatus adaptation frequency of the present utility model is wide, only just can realize adapting to the wide purpose of noise frequency with wedge absorber without other structure.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the structural representation of the wedge absorber in the utility model;

Number in the figure: the 1st, flange, the 2nd, take over, 3～10 is respectively first～the 8th wedge absorber, the 11st, housing, the 12nd, shrouding, the 13rd, perforated plate, 14 is first sound-absorbing materials, 15 is second sound-absorbing materials.

Embodiment

Below in conjunction with specific embodiments and the drawings the utility model is further described.

As shown in Figure 1, the silencing apparatus with wedge absorber comprises the drum-shaped shell 11 that protrude at the middle part, and the two ends of housing 11 are connected with flange 1 by taking over 2 respectively, export to form sound wave inlet and sound wave respectively, and flange 1 conveniently is installed in silencing apparatus on the noise source.

Be respectively arranged with first～the 8th wedge absorber 3～10 (the parts sequence number in the present embodiment does not have special implication, only in order to express easily) of different length, different-thickness, different amount in the housing 11.

Each wedge absorber is pyramid shape, and one side is a shrouding 12, and what be connected with shrouding 12 has a perforated plate 13, is distributed with through hole on the perforated plate 13.

Be provided with first sound-absorbing material 14 in the another side that shrouding 12 is connected, be provided with second sound-absorbing material 15 in the pyramid space of wedge absorber.

The length of wedge absorber is according to the wavelength of noise sound wave and be set to 1/4 of each frequency wavelength respectively.

The noise sound wave enters from the sound wave inlet, wedge absorber in the silencing apparatus constitutes air-flow path, air flows produces the aerodynamic noise, noise waves equally vibrates the via hollow gas column statuary column plug on the wedge absorber perforated plate 13, air and hole wall friction are converted into heat energy dissipation with acoustic energy and fall, the sound wave that is attenuated makes the sound-absorbing material vibration once more, is further decayed; When the length of wedge absorber be wavelength 1/4 the time, sound wave and these vibration resonances, decay is maximum, acoustically effective is best; The spatial area that wedge absorber is surrounded in suppressor case is in continuous variation, air is at continuous dilatation or capacity reducing, vertical dilatational wave of air is constantly decayed, spatial volume in the wedge absorber also is stepless variation, the horizontal dilatational wave that is absorbed also constantly is attenuated, just sound wave has been disappeared, because the area of the volume of air flow in the wedge absorber also is stepless variation, so the sound wave of each wavelength all can be absorbed decay, thereby the silencing apparatus of present embodiment adaptation frequency is wide, only just can realize adapting to the wide purpose of noise frequency with wedge absorber without other structure.

Claims

1, the silencing apparatus that has wedge absorber comprises that two ends are respectively arranged with the housing of voice entry and sound outlet (11), it is characterized in that, is provided with wedge absorber in the described housing.

2, the silencing apparatus that has wedge absorber according to claim 1, it is characterized in that, described wedge absorber is pyramid shape, one side is shrouding (12), what be connected with shrouding (12) has a perforated plate (13), with be provided with first sound-absorbing material (14) in the another side that shrouding (12) is connected, be provided with second sound-absorbing material (15) in the pyramid space of wedge absorber.

3, have the silencing apparatus of wedge absorber as claimed in claim 1 or 2, it is characterized in that, the cydariform that described housing (11) protrudes for the middle part, two ends are connected with flange (1) by taking over (2) respectively.

4, have the silencing apparatus of wedge absorber as claimed in claim 1 or 2, it is characterized in that, be provided with the wedge absorber of several different lengths, different-thickness, different wedge angles in the described housing (11).

5, have the silencing apparatus of wedge absorber according to claim 1, it is characterized in that, the length of described wedge absorber is administered 1/4 of noise wave length of sound.

6, as having the silencing apparatus of wedge absorber as described in the claim 4, it is characterized in that the length of described wedge absorber is administered 1/4 of noise wave length of sound.