CN208153095U - SCR postprocessor and its silencing apparatus - Google Patents
SCR postprocessor and its silencing apparatus Download PDFInfo
- Publication number
- CN208153095U CN208153095U CN201820389486.6U CN201820389486U CN208153095U CN 208153095 U CN208153095 U CN 208153095U CN 201820389486 U CN201820389486 U CN 201820389486U CN 208153095 U CN208153095 U CN 208153095U
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- gas
- silencing apparatus
- partition
- guide tube
- porous plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Exhaust Silencers (AREA)
Abstract
The utility model discloses a kind of silencing apparatus of SCR postprocessor, the gas-guide tube being connect including shell, porous plate, silencing cotton, tailpipe, perforated panel, partition and both ends with partition and perforated panel, porous plate and silencing cotton are installed in shell, the side wall of gas-guide tube is equipped with the first gas port, the side wall and partition side wall of perforated panel are connect with the inner wall of shell, perforated panel is equipped with the first air inlet being connected to gas-guide tube, along gas discharge direction, between perforated panel and porous plate, porous plate is located in front of partition partition.Silencing apparatus provided by the present application significantly reduces exhaust noise.The invention also discloses a kind of SCR postprocessors including above-mentioned silencing apparatus.
Description
Technical field
The utility model relates to Reducing Internal Combustion Engine Noise technical field, in particular to a kind of silencing apparatus of SCR postprocessor.This
Utility model further relates to a kind of SCR postprocessor including above-mentioned silencing apparatus.
Background technique
Main device of the SCR postprocessor as harmful components in purifying exhaust gas of internal combustion engine, while realizing that reduction exhaust is made an uproar
The purpose of sound, wherein SCR postprocessor is gone the harmful NOx substance reduction in exhaust gases of internal combustion engines by Chemoselective reduction
It removes, meets national emission regulation demands.
As shown in Figure 1, SCR postprocessor, when realizing noise reduction, exhaust is come out by air inlet pipe 01, occur by catalyst 02
Enter discharge chamber after catalysis reaction, then gas successively passes through porous plate 03, silencing cotton 04 and the row being mounted on rear end cap 05
Gas tail pipe 06 is discharged.
However, SCR postprocessor when carrying out noise reduction, is mainly eliminated the noise by resistive material, erasure effect is poor, nothing
Method realizes high noise reduction demand.
Therefore, how exhaust noise is reduced, is those skilled in the art's technical problem urgently to be resolved.
Utility model content
The purpose of the utility model is to provide a kind of silencing apparatus of SCR postprocessor, to reduce exhaust noise.This is practical
Novel another object is to provide a kind of SCR postprocessor including above-mentioned silencing apparatus.
To achieve the above object, the utility model provides a kind of silencing apparatus of SCR postprocessor, including shell, porous
Plate, silencing cotton and tailpipe, the porous plate and the silencing cotton are installed in the shell, further include perforated panel, every
The side wall of the gas-guide tube that plate and both ends are connect with the partition and the perforated panel, the gas-guide tube is equipped with the first gas port, institute
The side wall and the partition side wall for stating perforated panel are connect with the inner wall of the shell, and the perforated panel is equipped with and the air guide
First air inlet of pipe connection, along gas discharge direction, the partition is described between the perforated panel and the porous plate
Porous plate is located in front of the partition.
Preferably, resonant cavity, the porous plate are formed between the porous plate, the partition and the outer wall of the gas-guide tube
On offer the second air inlet being connected to the resonant cavity.
Preferably, the gas-guide tube is multiple, and multiple gas-guide tubes are in array distribution.
It preferably, further include the porous sound absorbing layer being fitted on the perforated panel on the side wall of the gas-guide tube.
Preferably, arranged for interval between the partition and the porous plate, it is the partition, the gas-guide tube, described porous
Expansion chambers are formed between plate and the tailpipe.
Preferably, the silencing cotton is distributed around the tailpipe side wall, on the tailpipe just with the silencing cotton
Contraposition has installed the second gas port.
Preferably, second gas port is multiple, and multiple second gas ports are circumferential along the tailpipe side wall
It is uniformly distributed.
Preferably, first gas port is multiple, and multiple first gas ports are circumferential along the side wall of the gas-guide tube
It is uniformly distributed.
Preferably, the perforated panel and the uniform integrated formed structure of the gas-guide tube.
Including air inlet pipe and the silencing apparatus of the air inlet pipe outlet side, the noise elimination is arranged in a kind of SCR postprocessor
Device is silencing apparatus described in any of the above embodiments.
In the above-mentioned technical solutions, the silencing apparatus of SCR postprocessor provided by the utility model include shell, it is porous
The gas-guide tube that plate, silencing cotton, tailpipe, perforated panel, partition and both ends are connect with partition and perforated panel, porous plate and silencing cotton
It is installed in shell, the side wall of gas-guide tube is equipped with the first gas port, and the side wall and partition side wall of perforated panel are interior with shell
Wall connection, perforated panel is equipped with the first air inlet for be connected to gas-guide tube, along gas discharge direction, partition be located at perforated panel with it is more
Between orifice plate, porous plate is located in front of partition.
As can be seen from the above description, in silencing apparatus provided by the present application, at work, gas passes through more silencing apparatus
First air inlet of orifice plate enters the first gas-guide tube, and portion gas passes through where the first air guide gas inlet hole gas-guide tube outer wall and shell
Space, when sound field incident acoustic wave frequency f is equal with the resonant cavity intrinsic frequency, the air column in the first gas port is just due to altogether
Shake and generate violent vibration, in vibration air column and the first gas port aperture sidewall friction and sound can be consumed, play and disappear
Sound effect, remaining portion gas are absorbed sound by silencing cotton, significantly reduce exhaust noise.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the structural schematic diagram of the silencing apparatus of traditional SCR postprocessor；
Fig. 2 is the structural schematic diagram of SCR postprocessor provided by the utility model embodiment；
Fig. 3 is the structural schematic diagram of silencing apparatus provided by the utility model embodiment；
Fig. 4 is the partial structural diagram of silencing apparatus provided by the utility model embodiment；
Fig. 5 is the partial 3 d structure chart of silencing apparatus shown in Fig. 4.
Wherein in Fig. 1-5：01- air inlet pipe, 02- catalyst, 03- porous plate, 04- silencing cotton, 05- rear end cap, 06- exhaust
Tail pipe；
1- air inlet pipe, 2- carrier, 3- perforated panel, 4- porous sound absorbing layer, 5- resonant cavity, 6- gas-guide tube, 7- partition, 8- expansion
Chamber, 9- porous plate, 10- silencing cotton, 11- tailpipe.
Specific embodiment
The core of the utility model is to provide a kind of silencing apparatus of SCR postprocessor, to reduce exhaust noise.This is practical
Novel another core is to provide a kind of SCR postprocessor of silencing apparatus including above-mentioned SCR postprocessor.
It is with reference to the accompanying drawing and real in order to make those skilled in the art more fully understand the technical solution of the utility model
Applying mode, the utility model is described in further detail.
Fig. 2 to Fig. 5 is please referred to, in a specific embodiment, after the SCR that the utility model specific embodiment provides
Reason device silencing apparatus include shell, porous plate 9, silencing cotton 10, tailpipe, perforated panel 3, partition 7 and both ends and partition 7 and
The gas-guide tube 6 that perforated panel 3 connects, porous plate 9 and silencing cotton 10 be installed in the shell, and the side wall of gas-guide tube 6 is equipped with the
One gas port, the side wall and 7 side wall of partition of perforated panel 3 are connect with the inner wall of shell, and perforated panel 3 is equipped with to be connected with gas-guide tube 6
The first logical air inlet, along gas discharge direction, for partition 7 between perforated panel 3 and porous plate 9, porous plate 9 is located at partition 7,
Helmholz resonance device has been actually formed by the first gas port and cavity between perforated panel 3, gas-guide tube 6 and partition 7.
Silencing cotton 10 is porous material, and inside has countless microscopic spaces, is penetrated through each other between gap.When sound wave incident to material
When expecting surface, a part reflects, and a part penetrates material internal and propagates forward, and air between hole is caused to be transported in communication process
It is dynamic, it rubs between hole wall, due to viscosity and heat-conduction effect, sound can be changed into thermal energy and dissipated.
As can be seen from the above description, in the silencing apparatus provided by the application specific embodiment, silencing apparatus is working
When, gas enters gas-guide tube 6 by the first air inlet of porous plate 9, and portion gas passes through outside the first air guide gas inlet hole gas-guide tube 6
Space where wall and shell, when sound field incident acoustic wave frequency f is equal with 5 intrinsic frequency of resonant cavity, in the first gas port
Air column just generates violent vibration due to resonance, in vibration air column and aperture sidewall friction and sound can be consumed, rise
It is acted on to noise elimination, remaining portion gas is absorbed sound by silencing cotton 10, significantly reduces exhaust noise.
In order to further increase noise reduction effect, it is preferable that form resonance between porous plate 9, partition 7 and the outer wall of gas-guide tube 6
Chamber 5 offers the second air inlet being connected to resonant cavity 5 on porous plate 9.
Preferably, as shown in figure 4, gas-guide tube 6 be it is multiple, multiple gas-guide tubes 6 be in array distribution.In order to further increase drop
It makes an uproar effect, it is preferable that there are angles for the axis of multiple gas-guide tubes 6.
Further, which further includes the porous sound absorbing layer being fitted on perforated panel 3 on the side wall of gas-guide tube 6
4, it is specifically as follows sound-absorbing material-structure.Increase damping by sticking porous sound absorbing layer 4 after perforated panel 3, improves so more
The acoustic absorptivity of orifice plate 9, and effective sound sucting band width has been widened, enhance sound absorption effect.
Arranged for interval between partition 7 and porous plate 9 is formed between partition 7, gas-guide tube 6, porous plate 9 and tailpipe 11
Expansion chambers, in the entrance and exit position of expansion chambers, since discontinuous structure acoustic impedance generates change, sound wave is because of acoustic impedance
Change cause to reflect, to achieve the purpose that noise elimination.There are better effects to Middle and low frequency noise by resonant chamber and expansion chambers, hinders
Property eliminate the noise to high-frequency noises and have a better effects, it is comprehensive using then noise elimination value with higher and wider frequency of noise elimination range,
There is sufficiently large sound deadening capacity within the scope of required frequency of noise elimination, meets requirement of the vehicle by noise.It is provided by the present application to disappear
Acoustic device forms resonant chamber, expansion cavity 8 and the sound absorption three-level noise elimination structure of silencing cotton 10, and sound wave is by that time, there will be a systems
The effective damping capacities such as column resonance, reflection and Friction dissipation.Resonance noise-reducing structure, expansion noise-reducing structure and resistance in this way
The three-level combined type of property noise-reducing structure can improve SCR acoustic characteristics very well.
In order to further increase noise elimination effect, it is preferable that silencing cotton 10 is distributed around 11 side wall of tailpipe, on tailpipe 11
The second gas port is equipped with 10 face position of silencing cotton.More preferably, the second gas port is multiple, multiple second gas ports edge
Gas-guide tube side wall is circumferentially uniformly distributed.
Further, the first gas port is multiple, and multiple first gas ports are circumferentially uniformly distributed along the side wall of tailpipe 11,
Further increase noise elimination effect.
On the basis of above-mentioned each scheme, it is preferable that perforated panel 3 and the uniform integrated formed structure of gas-guide tube 6 are effectively reduced
The assembling difficulty of silencing apparatus.
Middle and low frequency noise can be effectively reduced in silencing means provided by the present application, resonant chamber noise elimination structure, especially altogether
Acoustic absorptivity is big in the frequency band of vibration frequency two sides, and erasure effect is obvious.By additional porous material, widened noise elimination frequency band and
Acoustic absorptivity.Expansion chambers noise elimination structure causes sound wave to reflect by changing acoustic impedance, is effectively reduced Middle and low frequency noise.Porous material
The silencing cotton 10 that material is constituted forms resistance noise reduction structure, and high-frequency noises are effectively reduced.10 chamber of resonant chamber, expansion chambers and silencing cotton
It is the noise elimination constituted respectively with reactive muffling unit and sound-absorbing material combination that three-level, which is coupled together and to form impedance composite muffler,
Device, resistant, dissipative muffler common feature have good noise elimination effect to basic, normal, high frequency noise.
On the other hand, structure is simple, and production cost is low, and high mechanical strength, service life is longer, is convenient for mass production,
Simultaneously because overall structure small volume, can satisfy a variety of vehicle complete vehicle arrangements and requires, application range is wider.
A kind of SCR postprocessor provided by the present application includes air inlet pipe 1 and the noise elimination dress that 1 outlet side of air inlet pipe is arranged in
It sets, wherein silencing apparatus is any of the above-described kind of silencing apparatus.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (10)
1. a kind of silencing apparatus of SCR postprocessor, including shell, porous plate (9), silencing cotton (10) and tailpipe (11),
The porous plate (9) and the silencing cotton (10) are installed in the shell, which is characterized in that further include perforated panel (3), every
The gas-guide tube (6) that plate (7) and both ends are connect with the partition (7) and the perforated panel (3), the side wall of the gas-guide tube (6) are set
There is the first gas port, the side wall and the partition (7) side wall of the perforated panel (3) are connect with the inner wall of the shell, described
Perforated panel (3) is equipped with the first air inlet being connected to the gas-guide tube (6), and along gas discharge direction, the partition (7) is located at
Between the perforated panel (3) and the porous plate (9), the porous plate (9) is located in front of the partition (7).
2. silencing apparatus according to claim 1, which is characterized in that the porous plate (9), the partition (7) and described
Resonant cavity (5) are formed between the outer wall of gas-guide tube (6), the be connected to the resonant cavity (5) is offered on the porous plate (9)
Two air inlets.
3. silencing apparatus according to claim 2, which is characterized in that the gas-guide tube (6) is multiple, multiple air guides
Managing (6) is in array distribution.
4. silencing apparatus according to claim 1, which is characterized in that further include be fitted in it is close on the perforated panel (3)
Porous sound absorbing layer (4) on the side wall of the gas-guide tube (6).
5. silencing apparatus according to claim 1, which is characterized in that between the partition (7) and the porous plate (9)
Expansion is formed between arrangement, the partition (7), the gas-guide tube (6), the porous plate (9) and the tailpipe (11)
Room.
6. silencing apparatus according to claim 1, which is characterized in that the silencing cotton (10) is around the tailpipe (11)
Side wall is distributed, and is equipped with the second gas port with the silencing cotton (10) face position on the tailpipe (11).
7. silencing apparatus according to claim 6, which is characterized in that second gas port be it is multiple, multiple described the
Two gas ports are circumferentially uniformly distributed along the tailpipe (11) side wall.
8. silencing apparatus according to claim 1, which is characterized in that first gas port be it is multiple, multiple described the
One gas port is circumferentially uniformly distributed along the side wall of the gas-guide tube (6).
9. silencing apparatus according to claim 1 to 8, which is characterized in that the perforated panel (3) and described lead
Tracheae (6) uniform integrated formed structure.
10. a kind of SCR postprocessor, silencing apparatus including air inlet pipe (1) and setting in the air inlet pipe (1) outlet side,
It is characterized in that, the silencing apparatus is silencing apparatus of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820389486.6U CN208153095U (en) | 2018-03-21 | 2018-03-21 | SCR postprocessor and its silencing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820389486.6U CN208153095U (en) | 2018-03-21 | 2018-03-21 | SCR postprocessor and its silencing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208153095U true CN208153095U (en) | 2018-11-27 |
Family
ID=64392276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820389486.6U Active CN208153095U (en) | 2018-03-21 | 2018-03-21 | SCR postprocessor and its silencing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208153095U (en) |
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2018
- 2018-03-21 CN CN201820389486.6U patent/CN208153095U/en active Active
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