CN106468197B - A kind of wideband noise-reducing silencer - Google Patents
A kind of wideband noise-reducing silencer Download PDFInfo
- Publication number
- CN106468197B CN106468197B CN201610917090.XA CN201610917090A CN106468197B CN 106468197 B CN106468197 B CN 106468197B CN 201610917090 A CN201610917090 A CN 201610917090A CN 106468197 B CN106468197 B CN 106468197B
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- baffle
- punch block
- chamber
- shell
- sound
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Classifications
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- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
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- 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
- F01N13/20—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 having flared outlets, e.g. of fish-tail shape
-
- 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
- F01N2210/00—Combination of methods of silencing
Abstract
The invention belongs to motor vehicle exhaustion system technical fields, more particularly to a kind of wideband noise-reducing silencer, including shell, it is arranged in the intracorporal baffle of shell and chamber, baffle includes the first baffle set gradually, second baffle and third baffle, chamber includes first chamber, second chamber, third chamber and the 4th chamber, the front end face through shell is equipped in chamber, the air inlet pipe of first baffle and second baffle, through first baffle, second baffle, third baffle, with the escape pipe of the rear end face of shell, first baffle, the first punch block is respectively equipped on second baffle and third baffle, second punch block and third punch block, air inlet pipe, which is located on the tube wall of first chamber and second chamber, is respectively equipped with the 4th punch block and the 5th punch block, first sleeve is arranged on 4th punch block, the tube wall that escape pipe is located at second chamber is equipped with the 6th Punch block is arranged with the second casing on the 6th punch block, is equipped with sound-absorbing material in first sleeve, the second casing and the 4th chamber.
Description
Technical field
The invention belongs to motor vehicle exhaustion system technical field more particularly to a kind of wideband noise-reducing silencers.
Background technique
With the development of communications and transportation, the problem of noise pollution of automobile becomes increasingly conspicuous, it has also become the world today is most important
Pollution source of noise.Wherein, exhaust noise is one of most important noise source in automobile noise, and the quality of Study of Acoustic Performance of Exhaust Muffler is straight
Connect the acoustic quality for influencing automobile.In automotive muffler field, mainly there are the common silencer of three classes, i.e. resistance noise reduction at present
Device, reactive muffler and impedance composite muffler.
Dissipative muffler is a kind of absorption-type silencer, it be using sound wave propagated in porous sound-absorbing material when, because
Friction can convert thermal energy for sound and dissipate, to achieve the purpose that noise elimination.The acoustic attenuation performance of material is similar in circuit
Resistance consumes electrical power, to gain the name.It is, in general, that dissipative muffler has good high frequency acoustic attenuation performance, eliminate the noise to low frequency
Performance is poor.
Reactive muffler is different from dissipative muffler, it does not use sound-absorbing material, but rely on pipeline section mutation or
Resonant cavity etc. cause the change of impedance during acoustic propagation and generation sound can reflection, interference and resonance sound-absorbing eliminate the noise to reduce
Device reaches noise elimination purpose to the sound energy of external radiation.In terms of energy point of view, dissipative muffler comes using the method that energy is converted
The sound energy at muffler outlet is reduced, and reactive muffler is mainly reduced at muffler outlet using the method that sound can shift
Sound energy.Reactive muffler centering, low-frequency noise inhibitory effect are preferable, but high frequency acoustic attenuation performance is poor.
The structure of impedance composite muffler incorporates the characteristics of first two silencer, and can both be absorbed sound material by porosity
High-frequency sound energy is converted thermal energy by material, but can by sound can reflection, interference and resonance come in inhibiting, the biography of low-frequency sound wave
It passs, there is wider deadening frequency band.Such silencer is widely used in automobile exhaust system.
Existing impedance composite muffler is come often through the quantity of simply regulating fender, interpolation pipe and resistance element
Performance is improved, there is no to the volume of chamber, piercing aperture and number, sound-absorbing material type and its physical characteristic (thickness, material
Density, bulk density etc.) etc. optimize, the practical noise elimination frequency band of these silencers can not cover all vehicle operating conditions
Broadband noise under (such as idling, high speed and climbing), in addition these silencers often have ignored the stream of air-flow at the beginning of design
To and the pressure loss.
In view of the above shortcomings, the designer, is actively subject to research and innovation, to found a kind of wideband noise reduction sound-deadening
Device makes it with more the utility value in industry.
Summary of the invention
In order to solve the above technical problems, there is good sound the object of the present invention is to provide a kind of wideband noise-reducing silencer
Learn performance, can the broadband noise to all engine speed ranges effectively inhibited.
A kind of broadband muffler proposed by the present invention, including shell, setting are in the intracorporal baffle of the shell and chamber, it is described
Baffle includes the first baffle, second baffle and third baffle set gradually, and the chamber includes by the first baffle, second
First chamber, second chamber, third chamber and the 4th chamber that baffle and third baffle successively separate, interior be equipped with of the shell are passed through
Wear the front end face of the shell, the air inlet pipe of first baffle and second baffle, through the first baffle, second baffle, third
The escape pipe of the rear end face of baffle and shell is respectively equipped with the first perforation in the first baffle, second baffle and third baffle
Area, the second punch block and third punch block, the air inlet pipe is located on the tube wall of the first chamber and second chamber to be set respectively
There are the 4th punch block and the 5th punch block, be arranged with first sleeve on the 4th punch block, the escape pipe is located at described the
The tube wall of two chambers is equipped with the 6th punch block, is arranged with the second casing, the first sleeve, second on the 6th punch block
Sound-absorbing material is equipped in casing and the 4th chamber.
Further, the exhaust port of the air inlet pipe is in horn-like.
Further, the escape pipe positioned at the third chamber sets that there are two be greater than 90 ° of bending angle.
Further, the front and back end ports of the first sleeve are welded on the outer wall of the air inlet pipe, second casing
Front and back end ports be respectively welded on the first baffle and second baffle.
Further, the material of the sound-absorbing material is ultra-fine fibre glass cotton, density of material 1000kg/m3~
1200kg/m3, the bulk density of material is 100kg/m3~150kg/m3。
Further, it is recessed to be set as spherical for the both ends of the surface of first punch block, the second punch block and third punch block
It is convex staggered.
Further, first punch block, the second punch block, third punch block, the 4th punch block, the 5th punch block and
6th punch block is respectively equipped with 211,178,125,448,288 and 288 perforation, and the aperture of the perforation is 3.5mm.
Further, the longest spacing between the front end face of the shell and the first baffle is 262 ± 2mm, described
Spacing between first baffle and the second baffle is 194 ± 2mm, between the second baffle and the third baffle between
Away from for 114 ± 2mm, the spacing between the third baffle and the rear end face of the shell is 92 ± 2mm.
Further, the outer diameter of the air inlet pipe is 50mm, wall thickness 1.2mm.
Further, the outer diameter of the escape pipe is 50mm, wall thickness 1.2mm.
According to the above aspect of the present invention, the present invention has at least the following advantages: the silencer of wideband noise reduction proposed by the present invention passes through
Multiple chambers, baffle and punch block guide the movement and propagation of air-flow and sound wave, increase the propagation path of sound wave, and complete
Multiple 180 ° of air-flows revolutions, enable the sound obtain biggish decaying；Positioned at the 4th punch block of first chamber, first sleeve
And the sound-absorbing material being arranged in first sleeve has collectively constituted a dissipative muffler, can be effectively reduced medium, high frequency and make an uproar
Sound；The 6th punch block, the second casing and the sound-absorbing material being arranged in the second casing positioned at second chamber have collectively constituted separately
An outer dissipative muffler, for inhibiting the noise again of the air-flow inside exhaust system especially silencer；4th chamber and third
Third punch block on baffle has collectively constituted a Helmholtz resonator, by adjusting the piercing aperture on third punch block
The noise under specific frequency can be dramatically reduced with punching rate and the geometric dimension of the 4th cavity；In order in increasing,
High frequency acoustic attenuation performance is provided with the sound-absorbing material of specific bulk density in the 4th chamber；It can be by the way that the second chamber be rationally arranged
The piercing aperture and punching rate of indoor 5th punch block make to allow the pressure loss to maintain in the case where guaranteeing acoustical behavior
In one zone of reasonableness.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 be in Fig. 1 A to schematic diagram；
Fig. 3 be in Fig. 1 B to schematic diagram；
Fig. 4 be in Fig. 1 C to schematic diagram.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Referring to Fig. 1 to 4, a kind of broadband muffler proposed by the present invention of a preferred embodiment of the present invention, including shell 1,
Baffle and chamber in shell 1 are set, and chamber is polymorphic structure.Baffle includes first baffle 2, the second baffle set gradually
3 and third baffle 4, chamber include the first chamber 5, second successively separated by first baffle 2, second baffle 3 and third baffle 4
Chamber 6, third chamber 7 and the 4th chamber 8.The front end face through shell 1, first baffle 2 and second baffle 3 are equipped in shell
Air inlet pipe 9, through first baffle 2, second baffle 3, third baffle 4 and shell 1 rear end face escape pipe 10, air inlet pipe 9
For exhaust port in horn-like, horn-like structure significantly reduces exhaust back pressure under the premise of guaranteeing acoustical behavior, positioned at the
The escape pipe 10 of three chambers 7 is set there are two the bending angle for being greater than 90 °, and " Z " shape is presented, the two bending angles can increase sound wave
Reflection, the propagation of acoustic energy attenuation amount, increase noise elimination effect.
The first punch block 11, the second punch block 12 and are respectively equipped in first baffle 2, second baffle 3 and third baffle 4
Three punch blocks 13, air inlet pipe 9, which is located on the tube wall of first chamber 5 and second chamber 6, is respectively equipped with the 4th punch block 14 and the 5th
Punch block 15, first sleeve 16 is arranged on the 4th punch block 14, and the front and back end ports of first sleeve 16 are welded on the outer of air inlet pipe 9
On wall, the tube wall that escape pipe 10 is located at second chamber 6 is equipped with the 6th punch block 17, is arranged with second set on the 6th punch block 17
The front and back end ports of pipe 18, the second casing 18 are respectively welded on first baffle 2 and second baffle 3.First sleeve 16, the second casing
18 and the 4th are equipped with sound-absorbing material 19 in chamber 8, and the 4th punch block 14,17 and of the 6th punch block is completely covered in sound-absorbing material 19
4th chamber 8.The material of sound-absorbing material 19 is ultra-fine fibre glass cotton, density of material 1000kg/m3~1200kg/m3, material
Bulk density be 100kg/m3~150kg/m3, which can realize high frequency sound absorption effect in the case where low cost
Maximization.
First punch block 11, the second punch block 12 and third punch block 13 are respectively equipped with 211,178,125 perforation, and
It is staggered that the both ends of the surface of one punch block 11, the second punch block 12 and third punch block 13 are set as spherical bumps, the type face by
Punch forming forms.4th punch block 14 arranges fork arrangement according to 16 rows 28 and has set 448 perforation, and the 5th punch block 15 is according to 16 rows
18 column fork arrangements have set 288 perforation, and the 6th punch block 17 arranges fork arrangement according to 16 rows 18 and set 288 perforation.Above-mentioned perforation
Aperture be 3.5mm.
The length of chamber is 662 ± 5mm, wherein the longest spacing between the front end face and first baffle 2 of shell 1 is 262
± 2mm, the spacing between first baffle 2 and second baffle 3 are 194 ± 2mm, the spacing between second baffle 3 and third baffle 4
For 114 ± 2mm, the spacing between third baffle 4 and the rear end face of shell 1 is 92 ± 2mm.The cavity of different length can be passed through
Generate the acoustic characteristics with different frequency range, especially play the role of eliminating expansion cavity by frequency.Outside air inlet pipe 9
Diameter is 50mm, wall thickness 1.2mm.The outer diameter of escape pipe 10 is 50mm, wall thickness 1.2mm.
The working principle of above-mentioned wideband noise-reducing silencer is: exhaust gas is flowed into from air inlet pipe 9, is flowed through then along air inlet pipe 9
The 4th punch block 14 on tube wall, because being filled with sound-absorbing material 19 between first sleeve 16 and air inlet pipe 9, and first sleeve 16
Both ends and the outer wall of air inlet pipe 9 weld together, therefore almost all of exhaust gas is moved on all along air inlet pipe 9, and one at this time
High-frequency noise is divided to enter in sound-absorbing material 19 by the 4th punch block 14, in sound wave reflection process, the sound energy quilt of high-frequency noise
It is converted into thermal energy.When exhaust gas flows through five punch block 15 of air inlet pipe 9, in, low-frequency sound wave expanded at perforation and by
Decaying, a part of sound wave can repeatedly to further be decayed, another part sound wave be logical for reflection in second chamber 6
Perforation is crossed to return in air inlet pipe 9.When the horn structure of air-flow and acoustic wave movement to air inlet pipe 9, sound wave is due to impedance unbalance
It is reflected, air-flow is gently diffused into third chamber 7 under the guide functions of horn structure, it can be seen that, the horn structure
With preferable acoustical behavior and aerodynamic performance.In third chamber 7, when sound wave encounters second baffle 3 and third baffle 4
It can reflect, the smoothness of the size and its surface of reflection case and baffle is directly related, when concave-convex staggered type face size
When equal to or less than wave length of sound, diffusing reflection occurs for sound wave, and irreflexive sound wave is mutually collided, reduced by multiple reflections
Sound energy, to achieve the effect that reduce low frequency noise.When sound wave enters in the 4th chamber 8, sound-absorbing material 19 is by high-frequency noise
It is converted to thermal energy, " diffusing reflection " on resonator and third baffle 4 that the 4th chamber 8 is formed with third punch block 13 is made jointly
Used in, low frequency noise, it is made to be effectively suppressed.When air-flow and sound wave are entered by the second punch block 12 on second baffle 3
When second chamber 6, in, low frequency noise further decayed because of the expansion perforated on second baffle 3 and " diffusing reflection ".Equally
, when air-flow and sound wave are in first chamber 5, because of the expansion and " diffusing reflection " effect perforated on first baffle 2, in, low frequency makes an uproar
Sound is attenuated again.Sound-absorbing when air-flow and sound wave flow through the 6th punch block 17 along escape pipe 10, in the second casing 18
By the air-flow in silencer, noise eliminates material 19 again, to reduce the high-frequency noise of the exhaust port of escape pipe 10.
In conclusion wideband noise-reducing silencer proposed by the present invention has the advantage that (1) passes through multiple chambers, baffle
And punch block guides the movement and propagation of air-flow and sound wave, increases the propagation path of sound wave, and complete multiple 180 °
Air-flow revolution, enables sound to have obtained biggish decaying；(2) it positioned at the 4th punch block 14 of first chamber 5, first sleeve 16 and sets
It sets the sound-absorbing material 19 in first sleeve 16 and has collectively constituted a dissipative muffler, medium, high frequency can be effectively reduced and made an uproar
Sound；(3) it is located at the 6th punch block 17, the second casing 18 and the sound-absorbing material 19 being arranged in the second casing 18 of second chamber 6
Another dissipative muffler is collectively constituted, for inhibiting the noise again of the air-flow inside exhaust system especially silencer；The
The front and back end ports of two casings 18 are respectively welded on first baffle 2 and second baffle 3, can increase the dissipative muffler in this way
The length of second casing 18 is extended to both ends baffle position here, further increases sound wave and sound-absorbing material 19 by noise elimination effect
Contact area and volume, the second casing 18 is welded on two baffles to the rigidity that can increase second chamber 6, reduces sound wave
The risk to resonate with shell 1 reduces the radiated noise of shell 1；(4) the 4th chambers 8 are perforated with the third in third baffle 4
Area 13 has collectively constituted a Helmholtz resonator, by adjusting on third punch block 13 piercing aperture and punching rate and
The geometric dimension of 4th chamber 8 can dramatically reduce the noise under specific frequency；(4) it eliminates the noise to increase medium, high frequency
Performance is provided with the sound-absorbing material 19 of specific bulk density in the 4th chamber 8；It (5) can be by the way that second chamber 6 be rationally arranged
The piercing aperture and punching rate of the 5th interior punch block 15 make to allow the pressure loss to maintain in the case where guaranteeing acoustical behavior
In one zone of reasonableness；(6) by the way that the length of each chamber and the caliber of disengaging tracheae 10 is reasonably arranged, 3 is formd and is disappeared
The different expansion cavity of acoustic performance, the inhibition for different frequency range noise；(7) air inlet pipe 9 is provided with one in third chamber 7
The exhaust port of " loudspeaker " type reduces local pressure loss, reduces and start for guiding the diffusion from 9 air-flow of air inlet pipe
The power loss of machine；(8) from technique and at originally, each components of the silencer belong to conventional type, manufacturing process letter
Single, cost is relatively low, suitable for mass production.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of broadband muffler, it is characterised in that: including shell, be arranged in the intracorporal baffle of the shell and chamber, the gear
Plate includes the first baffle, second baffle and third baffle set gradually, and the chamber includes by the first baffle, second gear
First chamber, second chamber, third chamber and the 4th chamber that plate and third baffle successively separate, interior be equipped with of the shell are run through
The front end face of the shell, first baffle and second baffle air inlet pipe, run through the first baffle, second baffle, third gear
The escape pipe of the rear end face of plate and shell is respectively equipped with the first perforation in the first baffle, second baffle and third baffle
Area, the second punch block and third punch block, the air inlet pipe is located on the tube wall of the first chamber and second chamber to be set respectively
There are the 4th punch block and the 5th punch block, be arranged with first sleeve on the 4th punch block, the escape pipe is located at described the
The tube wall of two chambers is equipped with the 6th punch block, is arranged with the second casing, the first sleeve, second on the 6th punch block
Sound-absorbing material is equipped in casing and the 4th chamber.
2. broadband muffler according to claim 1, it is characterised in that: the exhaust port of the air inlet pipe is in horn-like.
3. broadband muffler according to claim 1, it is characterised in that: the escape pipe positioned at the third chamber is set
There are two the bending angles for being greater than 90 °.
4. broadband muffler according to claim 1, it is characterised in that: the front and back end ports of the first sleeve are welded on institute
It states on the outer wall of air inlet pipe, the front and back end ports of second casing are respectively welded on the first baffle and second baffle.
5. broadband muffler according to claim 1, it is characterised in that: the material of the sound-absorbing material is that superfine glass is fine
Vinylon and cotton blend, density of material 1000kg/m3~1200kg/m3, the bulk density of material is 100kg/m3~150kg/m3。
6. broadband muffler according to claim 1, it is characterised in that: first punch block, the second punch block and
It is staggered that the both ends of the surface of three punch blocks are set as spherical bumps.
7. broadband muffler according to claim 1, it is characterised in that: first punch block, the second punch block, third
Punch block, the 4th punch block, the 5th punch block and the 6th punch block are respectively equipped with 211,178,125,448,288 and 288 and wear
Hole, the aperture of the perforation are 3.5mm.
8. broadband muffler according to claim 1, it is characterised in that: the front end face of the shell and the first baffle
Between longest spacing be 262 ± 2mm, spacing between the first baffle and the second baffle is 194 ± 2mm, described
Spacing between second baffle and the third baffle is 114 ± 2mm, between the third baffle and the rear end face of the shell
Spacing be 92 ± 2mm.
9. broadband muffler according to claim 1, it is characterised in that: the outer diameter of the air inlet pipe is 50mm, and wall thickness is
1.2mm。
10. broadband muffler according to claim 1, it is characterised in that: the outer diameter of the escape pipe is 50mm, and wall thickness is
1.2mm。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610917090.XA CN106468197B (en) | 2016-10-21 | 2016-10-21 | A kind of wideband noise-reducing silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610917090.XA CN106468197B (en) | 2016-10-21 | 2016-10-21 | A kind of wideband noise-reducing silencer |
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| CN106468197A CN106468197A (en) | 2017-03-01 |
| CN106468197B true CN106468197B (en) | 2019-02-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139190A (en) * | 2017-06-19 | 2019-01-04 | 上海天纳克排气系统有限公司 | Silencer |
| CN108224740A (en) * | 2018-03-09 | 2018-06-29 | 中建安装工程有限公司 | A kind of multistage impedance composite silencer and sound reduction method |
| CN108591017B (en) * | 2018-03-13 | 2020-03-10 | 北京化工大学 | Broadband pulsation attenuator |
| US11434794B2 (en) * | 2019-06-06 | 2022-09-06 | Caterpillar Inc. | Exhaust sound attenuation device |
| CN110375351B (en) * | 2019-06-27 | 2021-05-18 | 宁波方太厨具有限公司 | Smoke exhaust pipe suitable for range hood |
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|---|---|---|---|---|
| US5025890A (en) * | 1989-02-23 | 1991-06-25 | Mazda Motor Corporation | Engine exhaust apparatus |
| KR20020015115A (en) * | 2000-08-21 | 2002-02-27 | 이계안 | Muffler |
| CN201412209Y (en) * | 2009-05-08 | 2010-02-24 | 柳州利和排气控制系统有限公司 | Automobile muffler |
| CN104948267A (en) * | 2015-06-15 | 2015-09-30 | 柳州利和排气控制系统有限公司 | Motor vehicle silencer |
| CN204716346U (en) * | 2015-04-09 | 2015-10-21 | 北京市通州迪拉汽车附件有限公司 | Complex muffler |
| CN206338099U (en) * | 2016-10-21 | 2017-07-18 | 无锡红湖消声器有限公司 | A kind of wideband noise-reducing silencer |
-
2016
- 2016-10-21 CN CN201610917090.XA patent/CN106468197B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5025890A (en) * | 1989-02-23 | 1991-06-25 | Mazda Motor Corporation | Engine exhaust apparatus |
| KR20020015115A (en) * | 2000-08-21 | 2002-02-27 | 이계안 | Muffler |
| CN201412209Y (en) * | 2009-05-08 | 2010-02-24 | 柳州利和排气控制系统有限公司 | Automobile muffler |
| CN204716346U (en) * | 2015-04-09 | 2015-10-21 | 北京市通州迪拉汽车附件有限公司 | Complex muffler |
| CN104948267A (en) * | 2015-06-15 | 2015-09-30 | 柳州利和排气控制系统有限公司 | Motor vehicle silencer |
| CN206338099U (en) * | 2016-10-21 | 2017-07-18 | 无锡红湖消声器有限公司 | A kind of wideband noise-reducing silencer |
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| CN106468197A (en) | 2017-03-01 |
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