CN107120165A - A kind of twin exhaust pipes silencer - Google Patents
A kind of twin exhaust pipes silencer Download PDFInfo
- Publication number
- CN107120165A CN107120165A CN201710563220.9A CN201710563220A CN107120165A CN 107120165 A CN107120165 A CN 107120165A CN 201710563220 A CN201710563220 A CN 201710563220A CN 107120165 A CN107120165 A CN 107120165A
- Authority
- CN
- China
- Prior art keywords
- dividing plate
- chamber
- mozzle
- hole
- silencer
- 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.)
- Granted
Links
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
- 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
- F01N13/007—Apparatus used as intake or exhaust silencer
-
- 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
- F01N1/023—Helmholtz resonators
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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
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members
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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
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention discloses a kind of twin exhaust pipes silencer, it includes housing, it is individually fixed in first end cap and the second end cap at the housing two ends, it is arranged at the first dividing plate in the housing, second partition and the 3rd dividing plate, air inlet pipe, left bank tracheae, right blast pipe and some mozzles, the air inlet pipe is L-shaped, including the first body with the housing diameter parallel, second body of vertical first body and the first mozzle for being welded on the first body terminus inner, second mozzle and the 3rd mozzle, the left bank tracheae is each passed through and is fixed on first dividing plate and the first end is covered, two ends are respectively communicated with the second chamber and outside atmosphere；The right blast pipe is each passed through and is fixed on the second partition, on the 3rd dividing plate and the second end cap, and two ends are respectively communicated with the second chamber and outside atmosphere.Excellent noise reduction effect of the present invention, while airflow is smooth, the pressure loss is smaller, and exhaust back pressure disclosure satisfy that related request.
Description
Technical field
The present invention relates to a kind of twin exhaust pipes silencer, belong to engine exhaust post-processing technology field.
Background technology
At present, automobile exhaust noise has turned into one of Main Noise Sources of influence environment, and it is control to install exhaust silencer additional
The main method of exhaust noise processed.Due to the limitation of installing space, it can not generally ensure sufficiently large muffler volume, smaller
In the case of noise elimination volume, in order to ensure good soundproof effect, generally silencer indoor design need to be obtained very complicated, so as to lead
Exhaust back pressure increase is caused, engine power loss increase, economy reduction greatly reduces the reliability of silencer work.
The content of the invention
The purpose of the present invention is that there is provided one kind, the soundproof effect in whole frequency range is good for existing technical problem,
While the relatively small automobile exhaust muffler of exhaust resistance.
The present invention is achieved through the following technical solutions：
A kind of twin exhaust pipes silencer, it include housing, the first end cap and the second end cap that are individually fixed in the housing two ends,
The first dividing plate in the housing, second partition and the 3rd dividing plate, air inlet pipe, left exhaust are arranged at intervals at along housing axial direction
Pipe, right blast pipe and some mozzles, form first chamber, described first between first end cap and first dividing plate
Second chamber is formed between dividing plate and the second partition, the 3rd chamber is formed between the second partition and the 3rd dividing plate
Room, forms the 4th chamber between the 3rd dividing plate and second end cap；The air inlet pipe is L-shaped, including with the housing
First body of diameter parallel, the second body of vertical first body and it is welded on the first body terminus inner
First mozzle, the second mozzle and the 3rd mozzle, second body are located in the first chamber, first body
Extend through first dividing plate, the second partition and connect the 4th chamber with the 3rd dividing plate；First dividing plate
On also extend through and be fixed with the 4th mozzle that two ends connect the first chamber and the 4th chamber；Described the first dividing plate,
Also extended through on second partition and the 3rd dividing plate and be fixed with the 5th water conservancy diversion that two ends connect the first chamber and the second chamber
Pipe；The left bank tracheae is each passed through and is fixed on first dividing plate and the first end is covered, and two ends are respectively communicated with described
Second chamber and outside atmosphere；The right blast pipe is each passed through and is fixed on the second partition, the 3rd dividing plate and institute
State on the second end cap, two ends are respectively communicated with the second chamber and outside atmosphere；The left bank tracheae is in place in first chamber
Some first through hole are evenly arranged on indoor tube wall, the right blast pipe is equal on the tube wall in the 4th chamber
Even to be disposed with some second through holes, the left bank tracheae is arranged with the first acoustical cotton cover, the right side in the first through hole position
Blast pipe is arranged with the second acoustical cotton cover, the first acoustical cotton cover, the second acoustical cotton cover in second lead to the hole site
With in the 3rd chamber be filled with acoustical cotton.
As further improved technical scheme of the present invention, first body, left bank tracheae, right blast pipe and each water conservancy diversion
Pipe is each parallel to housing axis, and the purpose be arrangeding in parallel is the installation for facilitating each noise elimination pipeline.
As further improved technical scheme of the present invention, first dividing plate, second partition and the 3rd dividing plate
Edge is provided with flange, and the purpose and effect for setting flange are to be conducive to dividing plate being fixedly welded in suppressor case.
As further improved technical scheme of the present invention, first mozzle, second mozzle and described
Three mozzle external diameters are equal and tangent two-by-two.
As further improved technical scheme of the present invention, the external diameter of the 5th mozzle is less than the 4th mozzle
External diameter, purpose and effect are to make more air-flows to flow into second chamber by the third through-hole on the first dividing plate, are conducive to disappearing
Except low-frequency noise.
As further improved technical scheme of the present invention, the first through hole and the external diameter and quantity of second through hole
Equal, purpose and effect are to can use same set of mold cavity, reduce production cost.
As further improved technical scheme of the present invention, it is respectively equipped with first dividing plate and the 3rd dividing plate
The third through-hole and fourth hole of even distribution, and diameter of the diameter more than the fourth hole of the third through-hole.Purpose and
The air-flow that effect is to make the air-flow in silencer first chamber to be flowed into by third through-hole in second chamber, the 4th chamber passes through
Fourth hole flows into the 3rd chamber；The diameter of fourth hole is smaller, more has utilization to eliminate high-frequency noise.
As further improved technical scheme of the present invention, divide on the first acoustical cotton cover and the second acoustical cotton cover
Not She You some equally distributed fifth holes and the 6th through hole, purpose and effect are to make the air-flow entered in acoustical cotton cover to lead to
Cross fifth hole and the discharge of the 6th through hole.
As further improved technical scheme of the present invention, the cross section of described housing is oval, can be on the whole
Reduce volume and the occupy-place of silencer.
Compared to prior art, the present invention, can by setting three mozzles in the first body of air inlet pipe terminus inner
Low-frequency noise is effectively reduced, tail pipe pinking is prevented；5th mozzle and second chamber collective effect, disappear equivalent to He Ermuzi
Sound device, is mainly used in low frequency noise reduction；Air inlet pipe, mozzle and blast pipe interact, and form three pipe labyrinth silencers, can be very well
Ground eliminates high-frequency noises；The sound-absorbing material can effectively reduce high-frequency noise；Twin exhaust pipes is set, and air-flow can be more suitable
Freely discharge, effectively the pressure loss of reduction silencer.It is arranged such, the noise of each frequency can be eliminated effectively, eliminates the noise
Scope is wide, excellent noise reduction effect, while the circulation of silencer interior air-flow is smooth, the pressure loss is smaller, and exhaust back pressure disclosure satisfy that correlation
It is required that.
Brief description of the drawings
Fig. 1 is silencer sectional view provided in an embodiment of the present invention.
Fig. 2 is A-A profiles in Fig. 1.
Fig. 3 is B-B profiles in Fig. 1.
Fig. 4 is C-C profiles in Fig. 1.
Fig. 5 is the sectional view of the first acoustical cotton cover.
Fig. 6 is the sectional view of the second acoustical cotton cover.
Wherein, 1- housings, the end caps of 2- first, the end caps of 3- second, the dividing plates of 4- first, 4-1- third through-holes, 5- second partitions,
The dividing plates of 6- the 3rd, 6-1- fourth holes, 7- first chambers, 8- second chambers, the chambers of 9- the 3rd, the chambers of 10- the 4th, 11- air inlets
Pipe, the bodys of 11-1- first, the bodys of 11-2- second, the mozzles of 12- the 5th, the mozzles of 13- the 4th, 14- left bank tracheaes, 14-1-
First through hole, the right blast pipes of 15-, the through holes of 15-1- second, 16- the first acoustical cotton covers, 16-1- fifth holes, the sound-absorbings of 17- second
Cotton cover, the through holes of 17-1- the 6th, the mozzles of 18- first, the mozzles of 19- second, the mozzles of 20- the 3rd.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description：
As shown in figure 1, the present invention is a kind of twin exhaust pipes silencer, including the oval housing 1 in a cross section, fix respectively
The first end cap 2 and the second end cap 3 in the two ends of housing 1, it is arranged at intervals in the housing 1 along the axial direction of housing 1
First dividing plate 4, the dividing plate 6 of second partition 5 and the 3rd, air inlet pipe 11, left bank tracheae 14, right blast pipe 15, some mozzles.Its
In, the edge of first dividing plate 4, the second partition 5 and the 3rd dividing plate 6 is equipped with flange, the He of the first dividing plate 4
Equally distributed third through-hole 4-1 (see Fig. 2) and fourth hole 6-1 (see Fig. 4), wherein institute are additionally provided with 3rd dividing plate 6
The diameter for stating third through-hole 4-1 is more than the diameter of the fourth hole 6-1.Between first end cap 2 and first dividing plate 4
First chamber 7 is formed, second chamber 8, the second partition 5 and institute are formed between first dividing plate 4 and the second partition 5
The 3rd chamber 9 of formation between the 3rd dividing plate 6 is stated, the 4th chamber 10 is formed between the 3rd dividing plate 6 and second end cap 3.
The air inlet pipe 11 is L-shaped, and it is included with the first body 11-1 of the diameter parallel of housing 1, perpendicular to described
First body 11-1 the second body 11-2 and it is welded on the first mozzle 18 of the first body 11-1 terminus inners,
Two mozzles 19, the 3rd mozzle 20 (see Fig. 3).Wherein, the second body 11-2 is in the first chamber 7, and described
One body 11-1 extends through first dividing plate 4, the second partition 5 and connects the 4th chamber with the 3rd dividing plate 6
10.First mozzle 18, second mozzle 19 and the external diameter of the 3rd mozzle 20 are equal and tangent two-by-two, energy
Low-frequency noise is enough effectively reduced, tail pipe pinking is prevented.
Two ends connection described the is fixed with to realize to also extend through on good middle low frequency soundproof effect, first dividing plate 4
4th mozzle 13 of one chamber 7 and the 4th chamber 10；On described the first dividing plate 4, the dividing plate 6 of second partition 5 and the 3rd
Also extend through and be fixed with the 5th mozzle 12 that two ends connect the first chamber 7 and the second chamber 8；Wherein,
The external diameter of 5th mozzle 12 is less than the external diameter of the 4th mozzle 13.Air-flow enters institute from the air inlet pipe 11
The 4th chamber 10 is stated, then the air-flow flowed into through the 4th mozzle 13 in the first chamber 7, the first chamber 7 passes through
The third through-hole 4-1 and the 5th mozzle 12 on first dividing plate 4 enter the second chamber 8, finally from institute
State left bank tracheae 14 and the right blast pipe 15 flows out.5th mozzle 12 and the collective effect of second chamber 8, quite
In He Ermuzi silencers, it is mainly used in low frequency noise reduction；This part constitutes three pipe labyrinth silencers, contributes to low-frequency range in eliminating
Noise.
The left bank tracheae 14 is each passed through and is fixed on first dividing plate 4 and first end cap 2, two ends difference
Connect the second chamber 8 and outside atmosphere, the right blast pipe 15 is each passed through and provided in the second partition 5, described
On 3rd dividing plate 6 and second end cap 3, two ends are respectively communicated with the second chamber 8 and outside atmosphere.The left bank tracheae
12nd, the right blast pipe 15, the second body 11-2 and each mozzle are parallel.The left bank tracheae 14 is positioned at described
First through hole 14-1 is disposed with tube wall in first chamber 7, the right blast pipe 15 is in the 4th chamber 10
The second through hole 15-1, the first through hole 14-1 and the aperture of the second through hole 15-1 are disposed with tube wall and quantity is homogeneous
Deng.The left bank tracheae 14 is arranged with the first acoustical cotton cover 16 in the first through hole 14-1 positions, and the right blast pipe 15 exists
The second through hole 15-1 positions are arranged with the second acoustical cotton cover 17.The first acoustical cotton cover 16 is provided with equally distributed the
Five through hole 16-1 (see Fig. 5), the second acoustical cotton cover 17 is provided with equally distributed 6th through hole 17-1 (see Fig. 6).It is described
Acoustical cotton is filled with first acoustical cotton cover 16, the second acoustical cotton cover 17 and the 3rd chamber 9, in can effectively eliminating
High-frequency noise.
The technical concept and feature of above example only to illustrate the invention, are not intended to limit the protection model of the present invention
Enclose, those skilled in the art can modify or equivalent substitution to the present invention easily, and these embodiments all include
Within protection scope of the present invention.
Claims (9)
1. a kind of twin exhaust pipes silencer, it includes housing, the first end cap for being individually fixed in the housing two ends and the second end
The first dividing plate, second partition and the 3rd dividing plate, air inlet pipe, the left side cover, being arranged at intervals at along housing axial direction in the housing
Blast pipe, right blast pipe and some mozzles, first chamber is formed between first end cap and first dividing plate, described
Second chamber is formed between first dividing plate and the second partition, the 3rd is formed between the second partition and the 3rd dividing plate
Chamber, forms the 4th chamber between the 3rd dividing plate and second end cap；It is characterized in that：The air inlet pipe is L-shaped, bag
Include the first body with the housing diameter parallel, the second body of vertical first body and be welded on first pipe
The first mozzle, the second mozzle and the 3rd mozzle of body terminus inner, second body are located in the first chamber,
First body extends through first dividing plate, the second partition and connects the 4th chamber with the 3rd dividing plate；
Also extended through on first dividing plate and be fixed with the 4th mozzle that two ends connect the first chamber and the 4th chamber；It is described
The first dividing plate, second partition and the 3rd dividing plate on also extend through and be fixed with two ends and connect the first chamber and the second chamber
The 5th mozzle；The left bank tracheae is each passed through and is fixed on first dividing plate and the first end is covered, two ends point
The second chamber and outside atmosphere are not connected；The right blast pipe is each passed through and is fixed on the second partition, described
On three dividing plates and second end cap, two ends are respectively communicated with the second chamber and outside atmosphere；The left bank tracheae it is in place in
Some first through hole are evenly arranged on tube wall in the first chamber, the right blast pipe is in the 4th chamber
Tube wall on be evenly arranged some second through holes, the left bank tracheae is arranged with the first acoustical cotton in the first through hole position
Cover, the right blast pipe is arranged with the second acoustical cotton cover, the first acoustical cotton cover, described second in second lead to the hole site
Acoustical cotton is filled with acoustical cotton cover and the 3rd chamber.
2. twin exhaust pipes silencer as claimed in claim 1, it is characterised in that：First body, left bank tracheae, right exhaust
Pipe and each mozzle are each parallel to housing axis.
3. twin exhaust pipes silencer as claimed in claim 1, it is characterised in that：First dividing plate, second partition and described
The edge of 3rd dividing plate is provided with flange.
4. twin exhaust pipes silencer as claimed in claim 1 or 2, it is characterised in that：First mozzle, described second are led
Flow tube and the 3rd mozzle external diameter are equal and tangent two-by-two.
5. twin exhaust pipes silencer as claimed in claim 1, it is characterised in that：The external diameter of 5th mozzle is less than described
The external diameter of 4th mozzle.
6. the twin exhaust pipes silencer as any one of claim 1 to 5, it is characterised in that：The first through hole and institute
The external diameter for stating the second through hole is equal with quantity.
7. twin exhaust pipes silencer as claimed in claim 1, it is characterised in that：On first dividing plate and the 3rd dividing plate
Equally distributed third through-hole and fourth hole are respectively equipped with, and states the diameter of third through-hole and is more than the straight of the fourth hole
Footpath.
8. twin exhaust pipes silencer as claimed in claim 1, it is characterised in that：The first acoustical cotton cover and described second is inhaled
Some equally distributed fifth holes and the 6th through hole are respectively equipped with sound cotton cover.
9. twin exhaust pipes silencer as claimed in claim 1, it is characterised in that：The cross section of described housing is oval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710563220.9A CN107120165B (en) | 2017-07-11 | 2017-07-11 | Double exhaust pipe muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710563220.9A CN107120165B (en) | 2017-07-11 | 2017-07-11 | Double exhaust pipe muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107120165A true CN107120165A (en) | 2017-09-01 |
| CN107120165B CN107120165B (en) | 2023-05-23 |
Family
ID=59730967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710563220.9A Active CN107120165B (en) | 2017-07-11 | 2017-07-11 | Double exhaust pipe muffler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107120165B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104904A (en) * | 2018-01-18 | 2018-06-01 | 河南中盛汽配科技股份有限公司 | A kind of silencer with regulatory function |
| CN108590811A (en) * | 2018-04-12 | 2018-09-28 | 柳州利和排气控制系统有限公司 | Motor vehicle exhaust muffler |
| CN112145463A (en) * | 2020-09-24 | 2020-12-29 | 江苏徐工工程机械研究院有限公司 | Fan assembly, air cooling system and electric transmission engineering machinery |
| CN116733717A (en) * | 2023-08-08 | 2023-09-12 | 连云港市运国环保设备有限公司 | Sound-absorbing silencer |
Citations (5)
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| US20130213734A1 (en) * | 2012-02-16 | 2013-08-22 | Hyundai Motor Company | Horizontally installed muffler having sporty tone |
| CN103867276A (en) * | 2012-12-12 | 2014-06-18 | 起亚自动车株式会社 | Dual muffler |
| 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 |
| CN204716340U (en) * | 2015-04-09 | 2015-10-21 | 北京市通州迪拉汽车附件有限公司 | Five cavity impedance complex mufflers |
| CN207033563U (en) * | 2017-07-11 | 2018-02-23 | 华南理工大学 | A kind of twin exhaust pipes silencer |
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2017
- 2017-07-11 CN CN201710563220.9A patent/CN107120165B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130213734A1 (en) * | 2012-02-16 | 2013-08-22 | Hyundai Motor Company | Horizontally installed muffler having sporty tone |
| CN103867276A (en) * | 2012-12-12 | 2014-06-18 | 起亚自动车株式会社 | Dual muffler |
| CN204716340U (en) * | 2015-04-09 | 2015-10-21 | 北京市通州迪拉汽车附件有限公司 | Five cavity impedance complex mufflers |
| 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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104904A (en) * | 2018-01-18 | 2018-06-01 | 河南中盛汽配科技股份有限公司 | A kind of silencer with regulatory function |
| CN108590811A (en) * | 2018-04-12 | 2018-09-28 | 柳州利和排气控制系统有限公司 | Motor vehicle exhaust muffler |
| CN112145463A (en) * | 2020-09-24 | 2020-12-29 | 江苏徐工工程机械研究院有限公司 | Fan assembly, air cooling system and electric transmission engineering machinery |
| CN112145463B (en) * | 2020-09-24 | 2022-04-01 | 江苏徐工工程机械研究院有限公司 | Fan assembly, air cooling system and electric transmission engineering machinery |
| CN116733717A (en) * | 2023-08-08 | 2023-09-12 | 连云港市运国环保设备有限公司 | Sound-absorbing silencer |
| CN116733717B (en) * | 2023-08-08 | 2023-10-20 | 连云港市运国环保设备有限公司 | Sound-absorbing silencer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107120165B (en) | 2023-05-23 |
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