CN103089712B - A kind of denoising structure on axial flow mechanical pipe - Google Patents
A kind of denoising structure on axial flow mechanical pipe Download PDFInfo
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- CN103089712B CN103089712B CN201110349035.2A CN201110349035A CN103089712B CN 103089712 B CN103089712 B CN 103089712B CN 201110349035 A CN201110349035 A CN 201110349035A CN 103089712 B CN103089712 B CN 103089712B
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Abstract
The present invention relates to a kind of denoising structure on axial flow mechanical pipe, described axial flow machinery is blade type rotating machinery, the impeller both sides of axial flow machinery are communicated with by arranging bypass line by the outside of described axial flow mechanical pipe, the liquid be full of in this bypass tube is identical with the liquid in axial flow machinery, and the joint of the two ends of described bypass tube and the housing of axial flow mechanical pipe is by separating fluid every stream sound-penetrating apparatus.Described bypass tube is circulating line or right angle type pipeline.Describedly be mounted on original axial flow mechanical hull every stream sound-penetrating apparatus, can stop and flow through housing, and sound wave be propagated smoothly wherein, thus the device that fluid machinery upstream and downstream sound field is communicated with can be made.The present invention, by the device every stream entrant sound, sets up acoustics from offsetting passage at axial flow machinery upstream and downstream, makes the sound wave partial offset that same of axial flow machinery upstream and downstream anti-phase, thus reduces the hydrodynamic noise of axial flow machinery.
Description
Technical field
The present invention relates to the control technique of pipeline Axial-Flow mechanical flow noise, particularly a kind of denoising structure on axial flow mechanical pipe, is controlled axial flow turbomachine hydrodynamic noise from principle of cancellation by acoustics.
Background technique
There is very strong hydrodynamic noise in existing axial flow machinery (fan, water pump), is the important noise source of pipe-line system, not only have impact on operational site and surrounding environment, also had a strong impact on physical and mental health and the working efficiency of people.
Current noise control in duct mainly contains and fixes a silencer, lays sound-absorbing material and ACTIVE CONTROL three kinds of approach.In order to reduce the hydrodynamic noise of axial flow machinery, people such as generally to fix a silencer at the noise reducing apparatus in pipe-line system, but due to the restriction of size, especially in water piping system, silencing apparatus can not effectively reduce the low-frequency noise of axial flow machinery.Lay in the duct sound-absorbing material mainly for be high-frequency noises, to low-frequency noise not obvious control effects.ACTIVE CONTROL, as the noise control method grown up in recent years, also has many problems to need to overcome, also has some distances from practical application in algorithm stability and secondary source.
Neise (1992) summarizes the mechanism of production of rotary fluid machine hydrodynamic noise.Rotary fluid machine hydrodynamic noise is mainly due to the fluid motion of vane rotary driving mechanical inside, and fluid and impeller, housing etc. periodically interact and the turbulent flow of fluid itself causes.Rotary fluid machine hydrodynamic noise shows as the superposition of discrete noise and broadband noise, and its energy mainly concentrates on discrete noise place.Discrete noise interacts primarily of fluid and impeller and produces, and have obvious dipole characteristics, namely the sound wave of the upstream and downstream of fluid machinery has equal and opposite in direction, the feature that phase is 180 °.The dipole characteristics of people to pipeline fan noise source such as Baade (1977), Margetts (1987) and Abom (1995) have given experimental verification.
But in the practical application of axial flow machinery, the upstream and downstream of axial flow machinery separated by usual needs, in order to meet the needs of hydrodynamic characteristic, under this service condition, because the sound field of upstream and downstream is separated, originally be the axial flow machinery of sound source of the dipole, all become monopole radiation at upstream and downstream, thus cause serious hydrodynamic noise problem.
The people such as Bolton (2006) replace original wall to the material used around the fan in electronic equipment every stream entrant sound, have been communicated with the sound field of fan upstream and downstream, thus have reduced the radiated noise of fan.
Bypass tube is a kind of common duct attenuation device.Both at home and abroad the acoustic characteristics of bypass tube is conducted in-depth research.The people such as the people such as Selamet (1994) and Dai Genhua, Tian Rui (1995) have studied the sound transmission characteristic of common bypass tube by Plane wave theory, then the people (1997) such as Selamet continues have studied the transmission characteristics of the bypass tube of multiple parallel connection when only considering plane wave.The people (1997) such as the steps of Torregrosa etc. (2000) and domestic Zhu have studied the transmission characteristics of bypass tube in stream situation.Brady (2002) considers the impact of high order mode on bypass tube acoustically effective, and multiple bypass tube is applied to aeroengine noise reduction.Panigrah and Munjal (2005) gives the general algorithm of the device transmission characteristics with various different bypass tube.Poirier etc. (2011) have studied transmission characteristics when existing bypass tube in pipeline also lays sound-absorbing material.
The impact on low-frequency noise when but never someone studied impeller both sides bypass tube being connected on fluid machinery.
In a word, the productive life of hydrodynamic noise problem to people of fluid machinery has a significant impact, and fixes a silencer almost not act on low frequency part, and the method distance practical application of active noise controlling also has some problems to need to solve.
Summary of the invention
The object of the invention is to, for overcoming above-mentioned the problems of the prior art, thus providing a kind of denoising structure on axial flow mechanical pipe.
For achieving the above object, a kind of denoising structure on axial flow mechanical pipe provided by the invention, described axial flow machinery is blade type rotating machinery, it is characterized in that: the impeller both sides of axial flow machinery are communicated with by arranging a circulating line by the outside of described axial flow mechanical pipe, the liquid be full of in this circulating line is identical with the liquid in axial flow machinery, and the joint of the two ends of described circulating line and the housing of axial flow mechanical pipe is by separating fluid every stream sound-penetrating apparatus.Describedly be mounted on original axial flow mechanical hull every stream sound-penetrating apparatus, can stop and flow through housing, and sound wave be propagated smoothly wherein, thus the device that fluid machinery upstream and downstream sound field is communicated with can be made.
One as technique scheme is improved, and described axial flow machinery is axial fan or axial-flow pump.
As another improvement of technique scheme, described is sheet sound transmitting rubber every flowing sound-penetrating apparatus.
The hydrodynamic noise source of axial flow machinery and the interaction of impeller, fluid and housing are typical sound source of the dipole.But in actual applications, axial flow machinery is always connected with pipeline, due to the restriction of pipeline, axial flow machinery upstream and downstream becomes respectively with an anti-phase monopole sound source.The present invention, according to the dipole characteristics of pipeline Axial-Flow mechanical radiative sound field, by the sound field of sound source upstream and downstream being communicated with to get up every stream sound-penetrating apparatus, thus making to cancel out each other with an anti-phase sound wave part, reaching the object reducing noise radiation.
The invention has the advantages that, the present invention, by the device every stream entrant sound, sets up acoustics from offsetting passage at axial flow machinery upstream and downstream, makes the sound wave partial offset that same of axial flow machinery upstream and downstream anti-phase, thus reduces the hydrodynamic noise of axial flow machinery.And this technological scheme is implemented simple and easy, can effectively reduce the hydrodynamic noise of pipeline Axial-Flow machinery, especially low-frequency flow moving noise.
Accompanying drawing explanation
Fig. 1 is that inventive pipeline Axial-Flow mechanical flow noise is from the schematic diagram of offsetting control structure;
Fig. 2 is the contrast schematic diagram of the present invention from the insertion loss simulation result of cancellation control method;
Fig. 3 is that inventive pipeline Axial-Flow mechanical flow noise is from another schematic diagram of offsetting control structure;
Accompanying drawing identifies
1, axial flow mechanical pipe 2, bypass tube 3, impeller
4, every stream sound-penetrating apparatus
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.Of the present invention by with reference to the accompanying drawings to the detailed description of the embodiment of the present invention, above and other feature of the present invention and advantage will become clearer, wherein:
As shown in Figure 1, be a specific embodiment of the present invention.This structure is communicated with by axial flow mechanical pipe 1 at the impeller 3 both sides circulating line 2 of axial flow machinery, consistent with axial flow machinery of liquid in the by-pass line be communicated with, the joint being communicated with axial flow mechanical pipe 1 at circulating line 2 is with every stream sound-penetrating apparatus 4, in this example, adopt rubber, fluid is separated.Sound wave so not only can be made to pass through smoothly but also ensured the dynamics of fluid machinery.
As shown in Figure 2, be the insertion loss result that structure of the present invention adopts from cancellation control method.Axial flow mechanical pipe sectional area 0.01m
2, sound source is dipole source, annular connecting pipe length 0.8m, sectional area 0.01m
2, the main pipeline length between annular connecting pipe is 1m, and medium is water.Fig. 2 represent use Fig. 1 from cancellation control method and traditional by-pass line controlling method 0 to 500Hz hydrodynamic noise insertion loss contrast.Transverse axis represents frequency, and the longitudinal axis represents insertion loss.Solid line is the result from offsetting by-pass line, and dotted line is the result of common by-pass line, can find out that method of the present invention has the insertion loss of about 5dB under traditional noise countermeasure almost helpless extremely low frequency situation in figure.
Because common by-pass line be pipeline in the upstream of fluid machinery or downstream directly an external segment pipe to reach the object of Noise measarement, common by-pass line has obvious soundproof effect when the length difference of bypass tube and main pipeline be the odd-multiple of half-wavelength and the length sum of by-pass line and main pipeline is the integral multiple of wavelength, level off to zero extremely low frequency time, because now wave length of sound is very long, almost without any soundproof effect.And the present invention is when being placed on axial flow mechanical impellor both sides respectively the two ends of by-pass line, make use of the doublet sound radiation characteristic of axial flow machinery own, the sound wave of both sides can be cancelled out each other, and also have good soundproof effect at extremely low frequency place.
In this enforcement, although the vertical sectional shape of connecting pipe is annular, the vertical sectional shape of connecting pipe of the present invention is not limited to this.Other shape, such as right angle type can be changed into, the another kind of mode of execution of this method as shown in Figure 3 according to concrete engineer applied.
In this enforcement, although adopt sheet sound transmitting rubber every the material of stream sound-penetrating apparatus, the material every stream sound-penetrating apparatus of the present invention is not limited to this, such as, can adopt the acoustic window materials such as polyurethane.
It should be noted last that, above embodiment is only in order to illustrate technological scheme of the present invention and unrestricted.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, modify to technological scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. the denoising structure on axial flow mechanical pipe, described axial flow machinery is blade type rotating machinery, it is characterized in that: the impeller both sides of axial flow machinery are communicated with by arranging bypass line by the outside of described axial flow mechanical pipe, fluid-phase in the fluid be full of in this bypass tube and axial flow machinery with, the joint of the two ends of described bypass tube and the housing of axial flow mechanical pipe is by separating fluid every flowing sound-penetrating apparatus.
2. the denoising structure on axial flow mechanical pipe according to claim 1, is characterized in that, described axial flow machinery is axial-flow pump.
3. the denoising structure on axial flow mechanical pipe according to claim 1, is characterized in that, described is sheet sound transmitting rubber or polyurethane every flowing sound-penetrating apparatus.
4. the denoising structure on axial flow mechanical pipe according to claim 1, is characterized in that, described bypass tube is circulating line or right angle type pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110349035.2A CN103089712B (en) | 2011-11-07 | 2011-11-07 | A kind of denoising structure on axial flow mechanical pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110349035.2A CN103089712B (en) | 2011-11-07 | 2011-11-07 | A kind of denoising structure on axial flow mechanical pipe |
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| Publication Number | Publication Date |
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| CN103089712A CN103089712A (en) | 2013-05-08 |
| CN103089712B true CN103089712B (en) | 2015-11-04 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7069950B1 (en) * | 2005-03-30 | 2006-07-04 | Dresser, Inc. | Noise abatement module using Herschel-Quincke tubes |
| CN101198302A (en) * | 2005-05-25 | 2008-06-11 | 普渡研究基金会 | Fan noise control apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6112514A (en) * | 1997-11-05 | 2000-09-05 | Virginia Tech Intellectual Properties, Inc. | Fan noise reduction from turbofan engines using adaptive Herschel-Quincke tubes |
| WO2002059474A2 (en) * | 2000-10-02 | 2002-08-01 | Rohr, Inc. | Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive herschel-quincke tubes |
| WO2009014780A2 (en) * | 2007-04-26 | 2009-01-29 | Lord Corporation | Noise controlled turbine engine with aircraft engine adaptive noise control tubes |
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2011
- 2011-11-07 CN CN201110349035.2A patent/CN103089712B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7069950B1 (en) * | 2005-03-30 | 2006-07-04 | Dresser, Inc. | Noise abatement module using Herschel-Quincke tubes |
| CN101198302A (en) * | 2005-05-25 | 2008-06-11 | 普渡研究基金会 | Fan noise control apparatus |
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| CN103089712A (en) | 2013-05-08 |
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