CN106523071A - Exhaust silencer with automatic following under two working conditions for internal combustion engine - Google Patents
Exhaust silencer with automatic following under two working conditions for internal combustion engine Download PDFInfo
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- CN106523071A CN106523071A CN201611076079.1A CN201611076079A CN106523071A CN 106523071 A CN106523071 A CN 106523071A CN 201611076079 A CN201611076079 A CN 201611076079A CN 106523071 A CN106523071 A CN 106523071A
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- pipeline
- resonant cavity
- cylinder
- combustion engine
- internal combustion
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 44
- 230000003584 silencer Effects 0.000 title claims description 29
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000010453 quartz Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 230000008030 elimination Effects 0.000 description 10
- 238000003379 elimination reaction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
Two automatic exhaust muffler that follow of operating mode of internal-combustion engine, including one section pipeline 1 and pipeline 1 outer inclosed first resonance chamber 21, its characterized in that: a first round hole 13 is formed in the wall surface of the pipeline 1, and the first round hole 13 is communicated with the inner cavity of the pipeline 1 and a first resonant cavity 21; a first cylinder 11 is arranged on the inner wall of the pipeline 1 opposite to the first round hole 13, and the first cylinder 11 extends into the first round hole 13; the expansion coefficient of the material used for the first cylinder 11 is smaller than the expansion coefficient of the materials used for the pipe 1 and the first resonant cavity 21.
Description
Technical field
The present invention relates to a kind of exhaust silencer for internal-combustion engine.
Technical background
, used as power, in recent years, people are for the vibration noise of internal combustion engine for engineering machinery and the widely used internal combustion engine of vehicle
The requirement of control is also increasingly stricter, and the noise control Related product that has been increasingly becoming is into the technology barriers in market.Internal combustion engine
Total noise of centrifuge is mainly derived from the exhaust noise of electromotor, and it is in waste pipe to reduce exhaust noise most common method
Exhaust silencer is installed in road system, exhaust silencer can allow air-flow to pass through, effectively can prevent again or decrease sound
Can outwards propagate, be the simply effective method of one kind for controlling exhaust noise.Obtain extensive in noise control engineering
Using.Acoustic filter species is a lot, can be divided into dissipative muffler, reactive muffler, impedance complex formula according to noise-cancelling theory and structure
Three class of acoustic filter.Reactive muffler can be divided into expansion muffler and RESONANT CAVITY MUFFLER, and RESONANT CAVITY MUFFLER is using resonance
The impedance of structure causes the reflection of sound wave and is eliminated the noise.It is made up of aperture plate and resonant cavity, a diameter of φ d of aperture, hole
The effective length of neck is Lk, the volume of resonant cavity is V, and the velocity of sound is c, and its structure is as shown in Figure 1.
The noise elimination mechanism of RESONANT CAVITY MUFFLER：RESONANT CAVITY MUFFLER is outer one by one section of pipeline and pipe for being provided with some apertures
Closed cavity is constituted, and pipeline and cavity are connected by aperture.Aperture and cavity constitute a cavity vibration system, work as gas
When the resonant frequency of the frequency of sound wave and cavity vibration system of stream is close, system can occur resonance, certain matter in aperture pore-throat
The air column flowing velocity of amount is accelerated, frictional resistance increase, and a large amount of acoustic energy are converted into heat energy and consume, so as to reach noise elimination
Purpose.The resonant frequency of RESONANT CAVITY MUFFLER can be calculated by formula：
F in formula0Resonance cavity resonant frequency；
The c velocities of sound；
S0Orifice cross sectional area；
V resonant cavity volumes；
LkThe effective length of pore-throat.
From formula (1), each resonant structure has certain resonant frequency, and this resonant frequency is by orifice cross sectional
Area, resonant cavity volume, the effective length of pore-throat are determined, so the certain RESONANT CAVITY MUFFLER resonant frequency of structural parameters is logical
It is often specific, its sound deadening capacity is higher near resonant frequency, soundproof effect is good, when noise frequency differs larger with resonant frequency
When, sound deadening capacity drastically declines, and soundproof effect is poor, and the acoustic characteristicses of resonance exhaust silencer are as shown in Figure 2.
As shown in Figure 2, the characteristics of RESONANT CAVITY MUFFLER has frequency selectivity strong, is typically only capable to meet internal combustion engine a certain kind
Noise elimination requirement under operating mode, but it is in the criterion for noise control of engineering machinery and vehicle with internal combustion engine as power or related
In the test and measurement of noise control specification, idling and high speed are often most important two kinds of tests and the works for measuring and evaluating
Condition.Under idling and high-speed working condition, the main frequency of its noise is differed internal combustion engine so that employ the aerofluxuss of structure of resonant cavity
Acoustic filter can not be taken into account and meet internal combustion engine noise elimination requirement under idling and at a high speed both operating modes.
The content of the invention
The present invention to be overcome prior art only near its resonant frequency lower soundproof effect it is good, can only be under specific operation
The shortcoming effectively eliminated the noise, there is provided the exhaust silencer that a kind of two operating mode of internal combustion engine is followed automatically, can have under two kinds of operating modes
Good acoustic attenuation performance.
As engine conditions are different, the acoustic filter of the present invention can correspond to different resonant frequencies respectively, can take into account
Meet idling and noise elimination under both operating modes at a high speed to require, making an uproar under can solve the problem that existing RESONANT CAVITY MUFFLER only to a kind of operating mode
The problem that sound effectively can be eliminated the noise.
One outside the exhaust silencer that follows automatically of two operating mode of internal combustion engine of the present invention, including a segment pipe 1 and pipeline 1
The first closed resonant cavity 21, it is characterised in that：The first circular hole 13 is provided with the wall of described pipeline 1, the first circular hole 13 connects
Thread a pipe 1 inner chamber and the first resonant cavity 21；The inwall relative with the first described circular hole 13 of pipeline 1 is provided with the first cylinder
11, the first cylinder 11 stretches into the first circular hole 13；The coefficient of expansion of the material used by the first cylinder 11 is less than pipeline 1 and the first resonance
The coefficient of expansion of the material used by chamber 21.
Further, the side relative to the first resonant cavity 21 on described pipeline 1 is provided with the second resonant cavity 22, described
The second circular hole 14, the inner chamber and the second resonant cavity 22 of 14 connecting pipe 1 of the second circular hole are provided with the wall of pipeline 1；Pipeline 1 with
The relative inwall of the second described circular hole 14 is provided with the second cylinder 12, and the second cylinder 12 stretches into 14 hole of the first circle；Second cylinder
Linear expansion coefficient of the linear expansion coefficient of the material used by 12 less than the material used by pipeline 1 and the second resonant cavity 22.
Preferably, the first cylinder 11 and the second cylinder 12 are using the less quartz material manufacture of linear expansion coefficient, 1 He of pipeline
First resonant cavity 21, the second resonant cavity 22 are using the larger aluminum alloy materials manufacture of linear expansion coefficient.
The acoustic filter of the present invention in acoustic filter manufacture material, from the material of specific linear expansion coefficient, and reasonable design
The structure of resonant cavity parameter of acoustic filter.Under idling and high-speed working condition, the difference of delivery temperature causes the work of acoustic filter to internal combustion engine
Make that temperature is also different, due to the thermal deformation of material, make effective length Lk and orifice cross sectional area S0 of pore-throat that large change to occur,
Understand that according to formula (1) resonant frequency of acoustic filter also changes therewith, correspond to that idling is different with two kinds under high-speed working condition is total to respectively
Vibration frequency, so as to internal combustion engine can meet the requirement for reducing exhaust noise under idling and at a high speed both operating modes.
RESONANT CAVITY MUFFLER in the present invention is a kind of acoustic filter of simple structure, internal combustion engine under idling operation, temperature
Relatively low, the effective length of resonance exhaust silencer pore-throat is larger, orifice cross sectional area is less, and corresponding resonant frequency is little；Internal combustion engine exists
Under high-speed working condition, temperature is higher, as acoustic filter material occurs thermal deformation phenomenon, makes some knots of impact acoustic filter resonant frequency
Structure parameter size there occurs change, and the effective length of wherein resonance exhaust silencer pore-throat is less, orifice cross sectional area is larger, by formula
(1) show that resonant frequency increases, so as to the noise elimination function for realizing being followed under two operating mode of internal combustion engine automatically.
The I. C. engine exhaust RESONANT CAVITY MUFFLER of present invention design is different with engine conditions, corresponds to respectively different
Resonant frequency, only the soundproof effect under a kind of operating mode is good to solve the problems, such as existing RESONANT CAVITY MUFFLER.
On RESONANT CAVITY MUFFLER of the present invention manufactures and designs, according to internal combustion engine under different operating modes, the work temperature of acoustic filter
Degree is different, using the thermal expansion character of material, makes the structure of acoustic filter resonant cavity that thermal deformation to some extent, resonant cavity knot to occur
The size of structure parameter there occurs change, and resonant frequency size is finally taken into account and meets internal combustion engine in idling and high speed also with change
Eliminate the noise under both operating modes and require, realize the noise elimination function for being followed under two operating mode of internal combustion engine automatically.
It is an advantage of the invention that：General structure fix the usual resonant frequency of exhaust silencer for internal-combustion engine be it is specific, no
Can take into account idling is met with noise elimination requirement under both operating modes at a high speed.The exhaust silencer for internal-combustion engine of the present invention, using internal combustion engine
Idling is different with the delivery temperature of both operating modes at a high speed, and correspondingly the operating temperature of acoustic filter also has two kinds, as manufacture disappears
The thermal deformation of sound equipment material is different, makes the size of structure of resonant cavity parameter there occurs change, understands the resonance frequency of system by formula (1)
Rate also has two kinds, so internal combustion engine has two kinds of different resonant frequencies under idling with two kinds of operating modes at a high speed, can realize
There is preferable acoustic attenuation performance under two kinds of operating modes.
Description of the drawings：
Fig. 1 is existing resonance exhaust silencer；
Fig. 2 is the acoustic characteristicses schematic diagram of existing resonance exhaust silencer；
Fig. 3 is the structural representation of the present invention；
In figure：1 pipeline, 11 cylinders；2. pipeline；3. resonant cavity；
Fig. 4 is the acoustic characteristicses schematic diagram of the present invention.
Specific embodiment
Automatically the exhaust silencer followed referring to Fig. 3,4 pairs of two operating modes of inventive combustion engine is described further.
One outside the exhaust silencer that follows automatically of two operating mode of internal combustion engine of the present invention, including a segment pipe 1 and pipeline 1
The first closed resonant cavity 21.Be provided with the first circular hole 13 on the wall of described pipeline 1,13 connecting pipe 1 of the first circular hole it is interior
Chamber and the first resonant cavity 21；The inwall relative with the first described circular hole 13 of pipeline 1 is provided with the first cylinder 11, the first cylinder
11 stretch into the first circular hole 13；The coefficient of expansion of the material used by the first cylinder 11 is less than used by pipeline 1 and the first resonant cavity 21
The coefficient of expansion of material.
Side relative to the first resonant cavity 21 on described pipeline 1 is provided with the second resonant cavity 22, described pipeline 1
The second circular hole 14, the inner chamber and the second resonant cavity 22 of 14 connecting pipe 1 of the second circular hole are provided with wall；Pipeline 1 with it is described
The relative inwall of second circular hole 14 is provided with the second cylinder 12, and the second cylinder 12 stretches into 14 hole of the first circle；Used by second cylinder 12
The linear expansion coefficient of material be less than the linear expansion coefficient of pipeline 1 and the material used by the second resonant cavity 22.
, using the less quartz material manufacture of linear expansion coefficient, pipeline 1 and first is common for first cylinder 11 and the second cylinder 12
Chamber 21, the second resonant cavity 22 shake using the larger aluminum alloy materials manufacture of linear expansion coefficient.
During certain internal combustion engine, according to actual measurement：Under idling operation, the topmost noise frequency of exhaust noise is about
178Hz, about 97 DEG C of the operating temperature of exhaust silencer；Under high-speed working condition, the topmost noise frequency of exhaust noise is about
270Hz, about 270 DEG C of the operating temperature of exhaust silencer.
The present embodiment sets up a structure of resonant cavity, the inner tube of resonant cavity on the basis of the original acoustic filter of the internal combustion engine
Circular hole is opened on road, and the little cylinder of thermal coefficient of expansion is installed in pipe, and (appropriate depth in circular hole is stretched in one end of cylinder, circle
The other end of cylinder is fixed on interior conduit).Resonance chamber enclosure that acoustic filter is set up and interior conduit using linear expansion coefficient compared with
Big material manufacture, the cylinder in pipeline is from the minimum material manufacture of linear expansion coefficient.
When certain internal combustion engine works under idling operation, now certain depth in the circular hole on interior conduit is stretched in one end of cylinder
At degree, between circular hole and cylinder, effective cross-sectional area S0 of slit gap is less, and effective length Lk of pore-throat is larger, according to formula
(1) understand, under idling operation, the resonant frequency of exhaust silencer is less；Under high-speed working condition, the operating temperature of exhaust silencer
Raise, relatively significantly dilatancy occurs using the resonance chamber enclosure and interior conduit of the larger material manufacture of linear expansion coefficient, now
The cylinder that one end is fixed on interior conduit exits circular hole with the thermal expansion of interior conduit, subtracts effective length Lk of little pore-throat
It is little, while effective cross-sectional area S0 of hole increases because of the thermal expansion deformation of interior conduit between circular hole and cylinder, by formula (1)
Understand, the resonant frequency increase of exhaust silencer under high-speed working condition.The work of internal combustion engine acoustic filter under two kinds of different operating modes
Temperature is different, using the thermal expansion character of material, makes the structure of acoustic filter resonant cavity that thermal deformation to some extent to occur, changes
The size of structure of resonant cavity parameter, is understood that by formula (1) resonant frequency of system also has two kinds, so internal combustion engine is in idling and high speed
Two kinds of different resonant frequencies are had under two kinds of operating modes, the noise elimination function for being followed under two operating mode of internal combustion engine automatically is realized.
The resonance chamber enclosure and interior conduit of the exhaust silencer of present invention design is closed using the larger aluminum of linear expansion coefficient
Golden material manufacture, the cylinder in pipeline is from the minimum quartz material manufacture of linear expansion coefficient, the interior conduit in 20 DEG C of room temperature
On Circularhole diameter φ d be 10.00mm, the cylinder diameter φ d in pipe be 9.50mm, thickness of pipe wall is 1.00mm, such as
Shown in Fig. 3.The resonant frequency of this RESONANT CAVITY MUFFLER is calculated and should comply with formula (1) in theory, but due to the circle on interior conduit
Between hole and cylinder, effective length Lk of effective cross-sectional area S0 and hole of hole is difficult accurate description so that this is altogether
The resonant frequency of chamber acoustic filter of shaking to be adopted formula (1) to carry out calculating and have very big difficulty, and excessively simplification can also produce larger
Error.Here, can calculate using acoustics finite element emulation software that acoustics simulation calculation is carried out, to obtain the RESONANT CAVITY MUFFLER
Resonant frequency.According to idling for internal combustion engine working condition, its acoustic filter delivery temperature is 97 DEG C, by the aluminum that linear expansion coefficient is larger
There is thermal deformation in the interior conduit and resonance chamber enclosure that alloy material is manufactured, the Circularhole diameter φ d on interior conduit are 10.02mm, round
Cylinder is stretched in circular hole at 0.14mm, and the cylinder in pipe is manufactured by the minimum quartz material of linear expansion coefficient, several
There is no thermal deformation, so cylinder diameter φ d are still 9.50mm, the thermal deformation of interior conduit causes cylinder to stretch into inner tube
On road in circular hole at 0.07mm, it is 178Hz to calculate resonant frequency with acoustics finite element emulation software；According to internal combustion engine high speed work
Condition condition, its acoustic filter delivery temperature are 270 DEG C, and the big interior conduit of linear expansion coefficient and resonance chamber enclosure occur thermal deformation, interior
Circularhole diameter φ d on pipeline are 10.05mm, and the minimum quartz cylinder of linear expansion coefficient almost do not occur thermal deformation, institute
With cylinder diameter φ d still as 9.50mm, now, the thermal deformation of interior conduit causes cylinder to exit circular hole on interior conduit, circular hole
Distance is 0.43mm between cylinder, and it is 270Hz, idling and high speed to calculate its resonant frequency with acoustics finite element emulation software
The resonance exhaust silencer acoustic characteristicses curve of the acoustics finite element simulation under two kinds of operating modes is as shown in figure 4, the corresponding frequency of peak of curve
Rate is the resonant frequency of certain exhaust silencer for internal-combustion engine.The different operating modes of internal combustion engine, using the thermal expansion character of material, make to disappear
There is thermal deformation to some extent in the structure of sound device resonant cavity, the size of structure of resonant cavity parameter there occurs change, make internal combustion engine
Exhaust silencer has two kinds of different resonant frequencies under two kinds of different operating modes, respectively with certain internal combustion engine in idling and high speed
The main noise frequency that the exhaust noise for obtaining is surveyed under operating mode is close, realizes the noise elimination work(for being followed under two operating mode of internal combustion engine automatically
Can, the criteria of noise control under two operating mode of internal combustion engine can be met.(during acoustics finite element simulation, in order to consider temperature pair
The impact of velocity of sound size, under different temperatures, velocity of sound size is by C0(t DEG C)=331.5+0.6t1 can be obtained, under idling operation, aerofluxuss
The temperature of acoustic filter is 97 DEG C, and the velocity of sound is 390.67m/s；Under high-speed working condition, the temperature of exhaust silencer is 270 DEG C, the velocity of sound
For 496.2m/s).
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, the protection of the present invention
Scope is not construed as being only limitted to the concrete form stated by embodiment, and protection scope of the present invention is also and in art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (3)
1. the exhaust silencer that two operating mode of internal combustion engine is followed automatically, including a segment pipe (1) and pipeline (1) outward one is closed
First resonant cavity (21), it is characterised in that：The first circular hole (13), the first circular hole (13) are provided with the wall of described pipeline (1)
The inner chamber and the first resonant cavity (21) of connecting pipe (1)；Set on the inwall relative with described the first circular hole (13) of pipeline (1)
There is the first cylinder (11), the first cylinder (11) stretches into the first circular hole (13)；The coefficient of expansion of the material used by the first cylinder (11)
Less than the coefficient of expansion of the material used by pipeline (1) and the first resonant cavity (21).
2. the exhaust silencer that two operating mode of internal combustion engine as claimed in claim 1 is followed automatically, it is characterised in that：In described pipe
Side on road (1) relative to the first resonant cavity (21) is provided with the second resonant cavity (22), is provided with the wall of described pipeline (1)
Second circular hole (14), the inner chamber and the second resonant cavity (22) of the second circular hole (14) connecting pipe (1)；Pipeline (1) with it is described
The relative inwall of second circular hole (14) is provided with the second cylinder (12), and the second cylinder (12) stretches into the first circular hole (14)；Second circle
Line expansion system of the linear expansion coefficient of the material used by post (12) less than the material used by pipeline (1) and the second resonant cavity (22)
Number.
3. the exhaust silencer that two operating mode of internal combustion engine as claimed in claim 2 is followed automatically, it is characterised in that：First cylinder
(11) and the second cylinder (12) using the manufacture of linear expansion coefficient less quartz material, pipeline (1) and the first resonant cavity (21), the
Two resonant cavities (22) are using the larger aluminum alloy materials manufacture of linear expansion coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611076079.1A CN106523071B (en) | 2016-11-30 | 2016-11-30 | Exhaust silencer with automatic following under two working conditions for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611076079.1A CN106523071B (en) | 2016-11-30 | 2016-11-30 | Exhaust silencer with automatic following under two working conditions for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106523071A true CN106523071A (en) | 2017-03-22 |
| CN106523071B CN106523071B (en) | 2019-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201611076079.1A Active CN106523071B (en) | 2016-11-30 | 2016-11-30 | Exhaust silencer with automatic following under two working conditions for internal combustion engine |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985164A (en) * | 2019-11-19 | 2020-04-10 | 华侨大学 | Vibration-damping heat-insulating silencer |
| CN113294223A (en) * | 2021-06-15 | 2021-08-24 | 金华欧仑催化科技有限公司 | Exhaust silencer with automatic following under two working conditions for internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1253748A (en) * | 1959-04-10 | 1961-02-10 | Sulzer Ag | Resonator |
| CN204436550U (en) * | 2014-12-24 | 2015-07-01 | 北京汽车研究总院有限公司 | A kind of tailpipe and vehicle |
| US20160097315A1 (en) * | 2014-10-01 | 2016-04-07 | GM Global Technology Operations LLC | Silencer |
| CN105863784A (en) * | 2016-05-06 | 2016-08-17 | 隆鑫通用动力股份有限公司 | Enhancement type silencer |
| CN206280124U (en) * | 2016-11-30 | 2017-06-27 | 浙江工业大学 | The exhaust silencer that the operating mode of internal combustion engine two is followed automatically |
-
2016
- 2016-11-30 CN CN201611076079.1A patent/CN106523071B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1253748A (en) * | 1959-04-10 | 1961-02-10 | Sulzer Ag | Resonator |
| US20160097315A1 (en) * | 2014-10-01 | 2016-04-07 | GM Global Technology Operations LLC | Silencer |
| CN204436550U (en) * | 2014-12-24 | 2015-07-01 | 北京汽车研究总院有限公司 | A kind of tailpipe and vehicle |
| CN105863784A (en) * | 2016-05-06 | 2016-08-17 | 隆鑫通用动力股份有限公司 | Enhancement type silencer |
| CN206280124U (en) * | 2016-11-30 | 2017-06-27 | 浙江工业大学 | The exhaust silencer that the operating mode of internal combustion engine two is followed automatically |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985164A (en) * | 2019-11-19 | 2020-04-10 | 华侨大学 | Vibration-damping heat-insulating silencer |
| CN113294223A (en) * | 2021-06-15 | 2021-08-24 | 金华欧仑催化科技有限公司 | Exhaust silencer with automatic following under two working conditions for internal combustion engine |
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| Publication number | Publication date |
|---|---|
| CN106523071B (en) | 2019-04-09 |
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