CN107218108A - A kind of wideband high frequency silencing noise unit - Google Patents
A kind of wideband high frequency silencing noise unit Download PDFInfo
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- CN107218108A CN107218108A CN201710361052.5A CN201710361052A CN107218108A CN 107218108 A CN107218108 A CN 107218108A CN 201710361052 A CN201710361052 A CN 201710361052A CN 107218108 A CN107218108 A CN 107218108A
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/02—Tubes being perforated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/12—Tubes being corrugated
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention discloses a kind of wideband high frequency silencing noise unit, it includes air inlet pipe, bellows and escape pipe.Air inlet pipe and escape pipe are uiform section straight tube, are connected to the two ends of bellows, form an independent muffling unit.The bellows is U-shaped bellows, is made up of the different ripple of multiple wave heights, and each bellows height linearly rule of constant concentration increasing or decreasing.The present invention is rational in infrastructure, can work in hot environment, the acoustic characteristicses with independent wideband high frequency noise.The present invention provides a kind of wideband high frequency silencing noise unit, and the internal combustion engine exhaust silencer is provided with bellows, by reasonably designing, effectively increases the noise elimination bandwidth and sound deadening capacity of high frequency exhaust noise.
Description
Technical field
The present invention relates to Vehicular silencer technical field, more particularly to a kind of wideband high frequency silencing noise unit.
Background technology
Silencer is mounted on air powered equipment gas channel or in inlet and exhaust system, to reduce the device of noise,
It can both be caused air flow through, and noise can be effectively reduced again, be the effective tool for controlling noise, and being should in noise control technique
With at most most wide noise reducing apparatus.
By taking internal combustion engine as an example, exhaust silencer used in current internal combustion engine is based on reactive muffler, such silencer
Air inlet pipe and escape pipe connect expansion cavity, gas enters silencer from air inlet pipe, then from escape pipe discharge.This resistance disappears
Sound device is reflection and interference effect using sound wave etc., by changing the propagation characteristic of sound wave, hinders acoustic wave energy outwards to propagate.
However, due to the presence of the intrinsic upper cut-off frequency of reactive muffler itself, the frequency band more than cut-off frequency
It is interior, the very unobtainable preferable acoustic attenuation performance of reactive muffler.It is generally anti-using perforated pipe and the lifting of sound-absorbing material two ways
Property silencer is in cut-off frequency with the acoustic attenuation performance of super band.But, the use of both modes can dramatically increase silencer
Volume, and then silencer global design can be influenceed.How not change or reduce muffler volume and do not dramatically increase noise elimination
Under conditions of the device pressure loss, the acoustic attenuation performance of lifting reactive muffler on a wide frequency band then becomes reactive muffler design
Difficult point.
In view of this, internal combustion engine exhaust silencer internal structure how is improved, is improved from structure and wideband high-frequency noise is disappeared
Sound effective value, is those skilled in the art's technical problem urgently to be resolved hurrily.
The content of the invention
In order to solve above-mentioned problem, the present invention provides a kind of wideband high frequency silencing noise unit, the internal combustion engine
Silencer be provided with bellows, by reasonably designing, effectively increase the noise elimination bandwidth and sound deadening capacity of high frequency exhaust noise, for up to
This purpose, the present invention provides a kind of wideband high frequency silencing noise unit, including air inlet pipe, bellows, fixed plate and outlet
The two ends that pipe, the air inlet pipe and escape pipe are connected to bellows form an independent muffling unit, the bellows
Including at least two ripple pipe unit, each ripple pipe unit is fixed to form bellows by the fixation plate of both sides, each ripple
The linear increasing or decreasing other structures size of wave height of pipe unit is identical or the linear increasing or decreasing of waviness width its
His physical dimension is identical.
Further improvement of the present invention, the bound frequency and its bandwidth formula of effective noise elimination frequency band of the muffling unit
It is as follows：
Wherein dcmaxFor the maximum wave height of ripple pipe unit, dcminFor the minimal ripple height of ripple pipe unit, lcFor
The width of ripple pipe unit ripple, wcFor ripple interval, c0For the velocity of sound, fLFor the lower frequency limit of effective noise elimination frequency band, fHFor the upper limit
Cut-off frequency, BwFor noise elimination bandwidth.
Further improvement of the present invention, the ripple pipe unit is U-shaped, and the present invention commonly uses U-shaped ripple pipe unit.
20db (A) bandwidth is lost in further improvement of the present invention, described wideband high frequency silencing noise unit transmission
More than 2000Hz is reached, the bandwidth of wideband high frequency silencing noise unit transmission loss of the present invention can reach more than 2000Hz.
A kind of wideband high frequency silencing noise unit of the present invention, has the beneficial effect that compared with prior art：Profit of the invention
Combined with multiple U-shaped ripples in the way of specific rule, the noise elimination frequency band of each ripple is formed complementary and sound deadening capacity and formed
Superposition, and then the noise elimination bandwidth and sound deadening capacity of high-frequency noise can be effectively improved.Contrast in the prior art using sound-absorbing material and
Perforated pipe improves the mode eliminated the noise to high-frequency noise, and the present invention will not bring the increase of muffler volume.In addition, of the invention
Noise elimination bandwidth and sound deadening capacity will not be influenceed by greasy dirt and the obstruction of carbon particle in engine exhaust.And perforated pipe and sound absorption
Material is then sensitive to greasy dirt and carbon particle, easily therefore causes sound deadening capacity reduction or even fails, the present invention is not in similar
Situation, thus service life is more permanent, use environment is more extensive.It is of the invention for high-power large-duty engine and limited
Muffler desing under the conditions of installing space is particularly important.
Brief description of the drawings
Fig. 1 is front view of the present invention；
Fig. 2 is right view of the present invention；
Fig. 3 is parameter schematic diagram of the present invention；
Fig. 4 is the transmission loss curve map one of the embodiment of the present invention；
Fig. 5 is the transmission loss curve map two of the embodiment of the present invention；
Illustrate：
Wherein, plate, 4 escape pipes are fixed in 1 air inlet pipe, 2 ripple pipe units, 3.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
The present invention provides a kind of wideband high frequency silencing noise unit, and the internal combustion engine exhaust silencer is provided with bellows, by closing
The design of reason, effectively increases the noise elimination bandwidth and sound deadening capacity of high frequency exhaust noise.
Fig. 1-3, Fig. 1-3 be refer to for a kind of embodiment of wideband high frequency silencing noise unit provided by the present invention
Structural representation.
Wideband high frequency silencing noise unit in the embodiment, with air inlet pipe 1, bellows, fixed plate 3 and outlet
Pipe 4.The air inlet pipe 1 and escape pipe 4 are connected to the bellows two ends；The fixed plate 3 is used to fix bellows
Unit 2, prevents its recurring structure from deforming and influenceing acoustic attenuation performance.The wave height of the ripple pipe unit 2 be linearly incremented by or
Successively decrease, other structures size is identical.
Specifically, shown in Fig. 1 air inlet pipe 1 and the internal diameter of escape pipe 4 is 55mm, and the ripple pipe unit 2 is U faces ripple
Line pipe, is combined by 8 different ripples of wave height.The ripple of the ripple pipe unit 2 is by four fixed plates 3 along institute
State ripple pipe unit 2 to be axially evenly arranged, to fixed each ripple position.The maximum wave height of the ripple pipe unit 2
Dcmax and minimal ripple height dcmin are respectively 50mm and 15mm, and the wave height difference of adjacent corrugations is 5mm.The bellows
The width lc of ripple is 12.5mm, and ripple interval wc is 8mm.Can be pre- according to these physical dimensions and formula (1) and formula (2)
Estimate the bound frequency and its bandwidth of effective noise elimination frequency band of embodiment illustrated in fig. 1.
According to formula (1), it is 340m/s, the lower frequency limit fL of effective noise elimination frequency band of embodiment illustrated in fig. 1 to take velocity of sound c0
About 1292Hz, upper cut-off frequency fH are about 4271Hz, thus effective noise elimination frequency band of embodiment illustrated in fig. 1 for 1292Hz~
4271Hz, noise elimination bandwidth B w are 2979Hz, it is possible to achieve acoustic attenuation performance of the embodiment illustrated in fig. 1 to wideband high frequency noise.Though
Right formula (1) is the empirical equation for being applied to the present invention that inventor proposes, there is certain predicated error, but can be this hair
The design of other bright specific embodiments provides design considerations.
In use, the air inlet pipe 1 and escape pipe 4 can be exchanged, according to mounting means of the muffling unit in silencer
Depending on, the acoustic attenuation performance of the present invention is not influenceed.By taking embodiment shown in Fig. 1 as an example, noise signal enters from air inlet pipe 1, from a left side
To right each ripple for sequentially passing through bellows, the wideband from noise elimination frequency band lower frequency limit to noise elimination frequency band upper limiting frequency is realized
Band is eliminated the noise.Below by emulation experiment, there is good wideband high frequency noise come a kind of muffling unit for proving the present invention
Acoustic attenuation performance.Emulation experiment is using commercialization LMS Virtual.Lab simulation softwares.Fig. 4 loses for the transmission of embodiment illustrated in fig. 1
Curve.Figure 4, it is seen that effective noise elimination frequency band of the muffling unit of embodiment illustrated in fig. 1 be 1039.49Hz~
4004.185Hz, effective noise elimination bandwidth B w is about 2965Hz.Exemplified by transmitting loss 20dB (A), as shown in figure 5, real shown in Fig. 1
The noise elimination bandwidth B w about 2564Hz of example are applied, the acoustic attenuation performance of the wideband high frequency noise of structure of the present invention is also ensure that.Therefore,
Drawn from emulation experiment, the acoustic attenuation performance of wideband high frequency noise can be realized using the muffling unit of structure of the present invention.
During design, the noise elimination frequency band of designed muffling unit can be first estimated according to formula (1), in conjunction with emulation experiment
As a result the physical dimension to the muffling unit of design is adjusted, with the sound deadening capacity and noise elimination bandwidth needed for reaching.
The above described is only a preferred embodiment of the present invention, being not the limit for making any other form to the present invention
System, and any modification made according to technical spirit of the invention or equivalent variations, still fall within model claimed of the invention
Enclose.
Claims (4)
1. a kind of wideband high frequency silencing noise unit, including air inlet pipe (1), bellows, fixed plate (3) and escape pipe (4),
It is characterized in that：The two ends that the air inlet pipe (1) and escape pipe (4) are connected to bellows form an independent noise elimination list
Member, the bellows includes at least two ripple pipe unit (2), and each ripple pipe unit (2) is entered by the fixation plate (3) of both sides
Row is fixed to form bellows, the linear increasing or decreasing other structures size of wave height of each ripple pipe unit (2) it is identical or
The linear increasing or decreasing other structures size of waviness width is identical.
2. a kind of wideband high frequency silencing noise unit according to claim 1, it is characterised in that：The muffling unit
The bound frequency and its bandwidth formula of effective noise elimination frequency band are as follows：
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Wherein dcmaxFor the maximum wave height of ripple pipe unit, dcminFor the minimal ripple height of ripple pipe unit, lcFor ripple
The width of pipe unit ripple, wcFor ripple interval, c0For the velocity of sound, fLFor the lower frequency limit of effective noise elimination frequency band, fHEnd for the upper limit
Frequency, BwFor noise elimination bandwidth.
3. a kind of wideband high frequency silencing noise unit according to claim 1, it is characterised in that：The ripple pipe unit
(2) to be U-shaped.
4. a kind of wideband high frequency silencing noise unit according to claim 1 or 2 or 3, it is characterised in that：Described width
Frequency band high-frequency noise muffling unit transmission loss 20db (A) bandwidth reaches more than 2000Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361052.5A CN107218108A (en) | 2017-05-22 | 2017-05-22 | A kind of wideband high frequency silencing noise unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361052.5A CN107218108A (en) | 2017-05-22 | 2017-05-22 | A kind of wideband high frequency silencing noise unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107218108A true CN107218108A (en) | 2017-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710361052.5A Pending CN107218108A (en) | 2017-05-22 | 2017-05-22 | A kind of wideband high frequency silencing noise unit |
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| Country | Link |
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| CN (1) | CN107218108A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981022A (en) * | 2018-08-17 | 2018-12-11 | 珠海格力电器股份有限公司 | Vibration absorber and multi-online air-conditioning system equipped with it |
| CN114215669A (en) * | 2021-12-24 | 2022-03-22 | 安徽江淮汽车集团股份有限公司 | Method for eliminating air inlet broadband noise and expansion cavity structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3493076A (en) * | 1967-11-21 | 1970-02-03 | Rhone Poulenc Sa | Apparatus for smoothing pressure variations in gaseous flow |
| KR20140060923A (en) * | 2012-11-13 | 2014-05-21 | 이정대 | Bellows type resonator for engine and method of manufacturing same |
| CN205036479U (en) * | 2015-08-26 | 2016-02-17 | 安徽省锦瑞汽车部件有限公司 | Connecting pipe resonant cavity device admits air |
| CN205503250U (en) * | 2016-03-29 | 2016-08-24 | 重庆工商职业学院 | A device of making an uproar falls for automobile engine |
-
2017
- 2017-05-22 CN CN201710361052.5A patent/CN107218108A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3493076A (en) * | 1967-11-21 | 1970-02-03 | Rhone Poulenc Sa | Apparatus for smoothing pressure variations in gaseous flow |
| KR20140060923A (en) * | 2012-11-13 | 2014-05-21 | 이정대 | Bellows type resonator for engine and method of manufacturing same |
| CN205036479U (en) * | 2015-08-26 | 2016-02-17 | 安徽省锦瑞汽车部件有限公司 | Connecting pipe resonant cavity device admits air |
| CN205503250U (en) * | 2016-03-29 | 2016-08-24 | 重庆工商职业学院 | A device of making an uproar falls for automobile engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981022A (en) * | 2018-08-17 | 2018-12-11 | 珠海格力电器股份有限公司 | Vibration absorber and multi-online air-conditioning system equipped with it |
| CN114215669A (en) * | 2021-12-24 | 2022-03-22 | 安徽江淮汽车集团股份有限公司 | Method for eliminating air inlet broadband noise and expansion cavity structure |
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Application publication date: 20170929 |
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