CN108979793A - The silencer of vehicle exhaust can be purified - Google Patents
The silencer of vehicle exhaust can be purified Download PDFInfo
- Publication number
- CN108979793A CN108979793A CN201811124909.2A CN201811124909A CN108979793A CN 108979793 A CN108979793 A CN 108979793A CN 201811124909 A CN201811124909 A CN 201811124909A CN 108979793 A CN108979793 A CN 108979793A
- Authority
- CN
- China
- Prior art keywords
- muffler section
- shell
- section
- air inlet
- muffler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003584 silencer Effects 0.000 title claims description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 230000001413 cellular effect Effects 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims abstract description 8
- 230000030279 gene silencing Effects 0.000 claims description 23
- 230000008030 elimination Effects 0.000 claims description 5
- 238000003379 elimination reaction Methods 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
- F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Ceramic Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Abstract
This application discloses the silencers that one kind can purify vehicle exhaust, including shell and it is staggered in the air inlet pipe at the shell both ends, exhaust pipe, it include the resonant cavity being made of two side partitions and inner walls in the shell, the resonant cavity center is equipped with intermediate bulkhead, the air inlet pipe includes integrally formed first linkage section and the first muffler section, first muffler section is located in the resonant cavity, the exhaust pipe includes integrally formed second linkage section and the second muffler section, second muffler section is set in the shell, the air inlet pipe is in the intracorporal one end of the shell through the resonant cavity, the exhaust pipe is in the intracorporal one end of the shell through the intermediate bulkhead, first muffler section and the second muffler section offer several cellular through-holes, the inside and outside wall of first muffler section and the second muffler section is all provided with There is catalyst coat.This application structure is simple, vehicle exhaust noise is effectively reduced, while converting innocuous gas for the pollutant in tail gas.
Description
Technical field
This application involves tail gas clean-up technical field, in particular to a kind of silencer that can purify vehicle exhaust.
Background technique
The dirty tail gas and noise that car combustion engine generates are environomental pollution sources.Cleaning of off-gas and elimination noise generally use
Different technical measures.There are two types of the approach of cleaning of off-gas is general, one is emission controls by improving combustion: catalyst being added in machine, makes to fire
Oily full combustion can eliminate partial contamination.Another kind is external purification: excluding position in tail gas and increases exhaust gas cleaner or suction
Adsorption device, at present by the solid absorbent formed using carbon granule or carbon granule and other materials, the disadvantage is that adsorption capacity is low, high temperature
It is also easy to produce sintering, to block exhaust gas passes, the method for eliminating noise mainly uses mechanical means, such as current much disappears
Sound device uses the design of anechoic chamber, and sound is made to decay through repeatedly reflecting so that disappearing in anechoic chamber.Furthermore also have using suction
Attached method makees silencer outer wall using quieter material.It needs to take and different silencing apparatus and cleaning of off-gas device is set, reach both
The vent gas treatment requirement that purification is eliminated the noise again, causes that structure is complicated.So needing to propose to improve.
Summary of the invention
The purpose of the present invention is to provide one kind can purify the silencer of vehicle exhaust, with overcome it is in the prior art not
Foot.
To achieve the above object, the invention provides the following technical scheme:
The embodiment of the present application discloses a kind of silencer that can purify vehicle exhaust, including shell and is staggered in institute
Air inlet pipe, the exhaust pipe at shell both ends are stated, includes the resonant cavity being made of two side partitions and inner walls in the shell, it is described
Resonant cavity center is equipped with intermediate bulkhead, and the air inlet pipe includes integrally formed first linkage section and the first muffler section, and described the
One muffler section is located in the resonant cavity, and the exhaust pipe includes integrally formed second linkage section and the second muffler section, described
Second muffler section is set in the shell, and the air inlet pipe is in the intracorporal one end of the shell and runs through the resonant cavity, described
Exhaust pipe is in the intracorporal one end of the shell through the intermediate bulkhead, and first muffler section and the second muffler section offer
The inside and outside wall of several cellular first through hole, first muffler section and the second muffler section is equipped with the first catalyst coat.
Preferably, in the above-mentioned silencer that can purify vehicle exhaust, institute's first muffler section and second is eliminated the noise
Section outer wall is successively arranged with the first silencing plate of tubulose and the second silencing plate.
Preferably, in the above-mentioned silencer that can purify vehicle exhaust, first silencing plate is noise elimination cotton.
Preferably, in the above-mentioned silencer that can purify vehicle exhaust, second silencing plate, air inlet pipe and exhaust
Guan Jun is made of ceramic, and offers several cellular second through-holes in second silencing plate, inside and outside second silencing plate
Wall is equipped with the second catalyst coat.
Preferably, in the above-mentioned silencer that can purify vehicle exhaust, close to the side partition of the exhaust pipe
Third through-hole is successively offered away from the air inlet pipe.
Compared with the prior art, the advantages of the present invention are as follows: the acoustic wave filter structure that can purify vehicle exhaust is simple, has
Effect reduces vehicle exhaust noise, while converting innocuous gas for the pollutant in tail gas, protects environment.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 show in the specific embodiment of the invention structural schematic diagram that can purify the silencer of vehicle exhaust.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out detailed retouch
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, those of ordinary skill in the art's every other implementation obtained without making creative work
Example, shall fall within the protection scope of the present invention.
Join shown in Fig. 1, the silencer that can purify vehicle exhaust in the present embodiment, including shell 100 and is staggered
Air inlet pipe 200, exhaust pipe 300 in 100 both ends of shell include by 100 inner wall group of two side partitions 110 and shell in shell 100
At resonant cavity 120,120 center of resonant cavity be equipped with intermediate bulkhead 130, air inlet pipe 200 include integrally formed first linkage section
210 and first muffler section 220, the first muffler section 220 be located in resonant cavity 120, exhaust pipe 300 includes integrally formed second connecting
Section 310 and the second muffler section 320 are connect, the second muffler section 320 is set in shell 100, and air inlet pipe 200 is in shell 100
One end through-resonance chamber 120, exhaust pipe 300 are in one end in shell 100 through intermediate bulkhead 130,220 He of the first muffler section
Second muffler section 320 offers several cellular first through hole (not shown), the first muffler section 220 and the second muffler section
320 inside and outside wall is equipped with the first catalyst coat (not shown).
In the technical solution, vehicle exhaust, which enters this by air inlet pipe, to be purified in the silencer of vehicle exhaust, then lead to
The first through hole for crossing the first muffler section enters resonant cavity, is then discharged by the first through hole disengaging exhaust pipe of the second muffler section,
In the process, reflection and interference occur when propagating for sound wave, reduce acoustic energy and reach noise elimination purpose.Tail gas itself carries simultaneously
Amount of heat reacts under the effect of the catalyst, converts innocuous gas for the pollutant in tail gas.
Further, the first muffler section 220 and 320 outer wall of the second muffler section are successively arranged with the first silencing plate of tubulose 400
With the second silencing plate 500.
Further, the first silencing plate 400 is noise elimination cotton.
Further, the second silencing plate 500, air inlet pipe 200 and exhaust pipe 300 are made of ceramic, in the second silencing plate
Several cellular second through-holes (not shown) are offered, the second silencing plate inside and outside wall, which is equipped with the second catalyst coat, (does not scheme
Show).
In above-mentioned three technical solution, resonant cavity and cellular first through hole and the second through-hole form reactive muffler, disappear
Sound cotton is as dissipative muffler, with the use of can reduce basic, normal, high frequency noise simultaneously；Second silencing plate, air inlet pipe and exhaust pipe
It is made of ceramics (MgO2, Al2O3, SiO2), wherein the second silencing plate, the first muffler section and the second muffler section are urged as carrying
The inertia physical structure of agent coating, in order to there is biggish catalytic surface in lesser volume, the second silencing plate, first are eliminated the noise
Section and the second muffler section are machined with cellular hole, and the ingredient of the first catalyst coat and the second catalyst coat is identical,
Second silencing plate, the first muffler section and the second muffler section inside and outside wall can first apply one layer of extremely loose active layer, it is with metal
Based on oxide γ-AL2O3, since surface is very coarse, this makes the real area of wall surface increase about 7000 times, greatly increases
Add the active surface of the first catalyst coat and the second catalyst coat and stores the ability of oxygen.First catalyst coat and
The main component of the ingredient of two catalyst coats includes the cocatalyst of the elements such as Zr containing zirconium and cerium Ce, and contains rhodium Rh, palladium Pd, platinum
The major catalyst of the noble metals such as Pt.
Further, third through-hole is successively offered away from air inlet pipe 200 close to the side partition 110 of exhaust pipe 300
111。
In the technical solution, tail gas enters the second muffler section after can passing through third through-hole by resonant cavity, and increasing this can be with
Purify the silencer processing capacity of vehicle exhaust.
In conclusion the acoustic wave filter structure that can purify vehicle exhaust is simple, vehicle exhaust noise is effectively reduced, simultaneously
Innocuous gas is converted by the pollutant in tail gas, protects environment.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the specific embodiment of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection scope of the application.
Claims (5)
1. one kind can purify the silencer of vehicle exhaust, including shell and be staggered in the shell both ends air inlet pipe,
Exhaust pipe includes the resonant cavity being made of two side partitions and inner walls in the shell, and the resonant cavity center is equipped with centre
Partition, the air inlet pipe include integrally formed first linkage section and the first muffler section, and first muffler section is located at described total
It shakes intracavitary, the exhaust pipe includes integrally formed second linkage section and the second muffler section, and second muffler section is set to institute
It states in shell, the air inlet pipe is in the intracorporal one end of the shell through the resonant cavity, and the exhaust pipe is in the shell
The intermediate bulkhead is run through in interior one end, and it is logical that first muffler section and the second muffler section offer several cellular first
The inside and outside wall of hole, first muffler section and the second muffler section is equipped with the first catalyst coat.
2. the silencer according to claim 1 that vehicle exhaust can be purified, it is characterised in that: first muffler section and
Second muffler section outer wall is successively arranged with the first silencing plate of tubulose and the second silencing plate.
3. the silencer according to claim 2 that vehicle exhaust can be purified, it is characterised in that: first silencing plate is
Noise elimination cotton.
4. the silencer according to claim 2 that vehicle exhaust can be purified, it is characterised in that: second silencing plate,
Air inlet pipe and exhaust pipe are made of ceramic, and offer several cellular second through-holes in second silencing plate, and described
Two silencing plate inside and outside walls are equipped with the second catalyst coat.
5. the silencer according to claim 4 that vehicle exhaust can be purified, it is characterised in that: close to the exhaust pipe
The side partition successively offers third through-hole away from the air inlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811124909.2A CN108979793A (en) | 2018-09-26 | 2018-09-26 | The silencer of vehicle exhaust can be purified |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811124909.2A CN108979793A (en) | 2018-09-26 | 2018-09-26 | The silencer of vehicle exhaust can be purified |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108979793A true CN108979793A (en) | 2018-12-11 |
Family
ID=64542925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811124909.2A Pending CN108979793A (en) | 2018-09-26 | 2018-09-26 | The silencer of vehicle exhaust can be purified |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108979793A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008274869A (en) * | 2007-04-27 | 2008-11-13 | Fujitsubo Giken Kogyo Kk | Muffler for automobile |
| CN201461034U (en) * | 2009-08-14 | 2010-05-12 | 诸城市海得威机械有限公司 | Exhaust silencer for light-weight cars |
| CN202431336U (en) * | 2012-01-11 | 2012-09-12 | 比亚迪股份有限公司 | Automotive exhaust silencer |
| CN104975909A (en) * | 2015-07-08 | 2015-10-14 | 中国船舶重工集团公司第七一九研究所 | Automobile exhaust silencer with air purifying function |
| CN207795339U (en) * | 2017-12-06 | 2018-08-31 | 杭州腾略科技有限公司 | A kind of automobile exhaust muffler |
| CN208885362U (en) * | 2018-09-26 | 2019-05-21 | 江苏七天环保科技有限公司 | The silencer of vehicle exhaust can be purified |
-
2018
- 2018-09-26 CN CN201811124909.2A patent/CN108979793A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008274869A (en) * | 2007-04-27 | 2008-11-13 | Fujitsubo Giken Kogyo Kk | Muffler for automobile |
| CN201461034U (en) * | 2009-08-14 | 2010-05-12 | 诸城市海得威机械有限公司 | Exhaust silencer for light-weight cars |
| CN202431336U (en) * | 2012-01-11 | 2012-09-12 | 比亚迪股份有限公司 | Automotive exhaust silencer |
| CN104975909A (en) * | 2015-07-08 | 2015-10-14 | 中国船舶重工集团公司第七一九研究所 | Automobile exhaust silencer with air purifying function |
| CN207795339U (en) * | 2017-12-06 | 2018-08-31 | 杭州腾略科技有限公司 | A kind of automobile exhaust muffler |
| CN208885362U (en) * | 2018-09-26 | 2019-05-21 | 江苏七天环保科技有限公司 | The silencer of vehicle exhaust can be purified |
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