CN107120165B - Double exhaust pipe muffler - Google Patents
Double exhaust pipe muffler Download PDFInfo
- Publication number
- CN107120165B CN107120165B CN201710563220.9A CN201710563220A CN107120165B CN 107120165 B CN107120165 B CN 107120165B CN 201710563220 A CN201710563220 A CN 201710563220A CN 107120165 B CN107120165 B CN 107120165B
- Authority
- CN
- China
- Prior art keywords
- pipe
- exhaust pipe
- partition plate
- flow guide
- holes
- 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.)
- Active
Links
Images
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
- 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
-
- 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
-
- 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 double-exhaust-pipe muffler, which comprises a shell, a first end cover, a second end cover, a first partition plate, a second partition plate, a third partition plate, an air inlet pipe, a left exhaust pipe, a right exhaust pipe and a plurality of flow guide pipes, wherein the first end cover and the second end cover are respectively fixed at two ends of the shell; the right exhaust pipe penetrates through and is fixed on the second partition board, the third partition board and the second end cover respectively, and two ends of the right exhaust pipe are communicated with the second chamber and the external atmosphere respectively. The invention has good noise reduction effect, smooth airflow circulation, smaller pressure loss and exhaust back pressure meeting the related requirements.
Description
Technical Field
The invention relates to a double exhaust pipe muffler, and belongs to the technical field of engine exhaust aftertreatment.
Background
At present, automobile exhaust noise has become one of the main noise sources affecting the environment, and the addition of an exhaust muffler is a main method for controlling the exhaust noise. Because of the limitation of installation space, the muffler volume which is large enough cannot be ensured generally, under the condition of smaller muffler volume, in order to ensure good muffler effect, the interior of the muffler is usually required to be designed to be complex, so that the exhaust back pressure is increased, the power loss of the engine is increased, the economical efficiency is reduced, and the working reliability of the muffler is greatly reduced.
Disclosure of Invention
The invention aims at solving the prior technical problems and provides the automobile exhaust muffler with good noise elimination effect in the whole frequency range and relatively small exhaust resistance.
The invention is realized by the following technical scheme:
the double exhaust pipe muffler comprises a shell, a first end cover, a second end cover, a first partition plate, a second partition plate, a third partition plate, an air inlet pipe, a left exhaust pipe, a right exhaust pipe and a plurality of flow guide pipes, wherein the first end cover and the second end cover are respectively fixed at two ends of the shell; the air inlet pipe is L-shaped and comprises a first pipe body parallel to the axis of the shell, a second pipe body perpendicular to the first pipe body, and a first flow guide pipe, a second flow guide pipe and a third flow guide pipe which are welded inside the tail end of the first pipe body, wherein the second pipe body is positioned in the first cavity, and the first pipe body penetrates through the first partition plate, the second partition plate and the third partition plate respectively to be communicated with the fourth cavity; the first baffle plate is also fixedly penetrated by a fourth flow guide pipe with two ends communicated with the first chamber and the fourth chamber; the first baffle plate, the second baffle plate and the third baffle plate are also fixedly penetrated by a fifth flow guide pipe with two ends communicated with the first chamber and the second chamber; the left exhaust pipe penetrates through and is fixed on the first partition board and the first end cover respectively, and two ends of the left exhaust pipe are communicated with the second chamber and the external atmosphere respectively; the right exhaust pipe penetrates through and is fixed on the second partition board, the third partition board and the second end cover respectively, and two ends of the right exhaust pipe are communicated with the second chamber and the external atmosphere respectively; the left exhaust pipe is located a plurality of first through holes are evenly arranged on the pipe wall in the first cavity, the right exhaust pipe is located a plurality of second through holes are evenly arranged on the pipe wall in the fourth cavity, the left exhaust pipe is sleeved with a first sound-absorbing cotton cover at the position of the first through hole, the right exhaust pipe is sleeved with a second sound-absorbing cotton cover at the position of the second through hole, and the first sound-absorbing cotton cover, the second sound-absorbing cotton cover and the third cavity are filled with sound-absorbing cotton.
As a further improved technical scheme of the invention, the first pipe body, the left exhaust pipe, the right exhaust pipe and the flow guiding pipes are parallel to the axis of the shell, and the parallel arrangement aims at facilitating the installation of the silencing pipelines.
As a further improved technical scheme of the invention, the edges of the first baffle plate, the second baffle plate and the third baffle plate are provided with turned edges, and the purpose and the function of the turned edges are favorable for welding and fixing the baffle plates in the muffler shell.
As a further improved technical scheme of the invention, the outer diameters of the first guide pipe, the second guide pipe and the third guide pipe are equal and tangential to each other.
As a further improved technical scheme of the invention, the outer diameter of the fifth flow guide pipe is smaller than that of the fourth flow guide pipe, and the purpose and effect are that more air flows into the second cavity through the third through holes on the first partition plate, so that low-frequency noise can be eliminated.
As a further improved technical scheme of the invention, the outer diameters and the number of the first through holes and the second through holes are equal, and the purpose and the effect are that the same set of die can be used for punching holes, so that the production cost is reduced.
As a further improved technical scheme of the invention, the first partition plate and the third partition plate are respectively provided with a third through hole and a fourth through hole which are uniformly distributed, and the diameter of the third through hole is larger than that of the fourth through hole. The purpose and the function are that the air flow in the first chamber of the muffler flows into the second chamber through the third through hole, and the air flow in the fourth chamber flows into the third chamber through the fourth through hole; the fourth through hole has a smaller diameter and is more useful for eliminating high frequency noise.
As a further improved technical scheme of the invention, the first sound-absorbing cotton cover and the second sound-absorbing cotton cover are respectively provided with a plurality of fifth through holes and sixth through holes which are uniformly distributed, and the aim and the effect are to enable the air flow entering the sound-absorbing cotton cover to be discharged through the fifth through holes and the sixth through holes.
As a further improved technical scheme of the invention, the cross section of the shell is elliptical, so that the volume and the occupied space of the muffler can be reduced as a whole.
Compared with the prior art, the invention can effectively reduce low-frequency noise and prevent tail pipe knocking by arranging the three guide pipes inside the tail end of the first pipe body of the air inlet pipe; the fifth flow guide pipe and the second cavity act together and are equivalent to a Helmholtz silencer and are mainly used for low-frequency silencing; the air inlet pipe, the honeycomb duct and the exhaust pipe interact to form a three-pipe labyrinth muffler, so that middle-high frequency noise can be well eliminated; the sound absorption material can effectively reduce high-frequency noise; the double exhaust pipes are arranged, so that air flow can be discharged more smoothly, and the pressure loss of the muffler is effectively reduced. The noise of each frequency can be effectively eliminated, the noise elimination range is wide, the noise reduction effect is good, meanwhile, the air flow in the muffler is smooth, the pressure loss is small, and the back pressure of exhaust can meet the related requirements.
Drawings
Fig. 1 is a cross-sectional view of a muffler provided by an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1.
FIG. 3 is a cross-sectional view of B-B in FIG. 1.
Fig. 4 is a cross-sectional view of fig. 1 taken along line C-C.
Fig. 5 is a cross-sectional view of a first sound absorbing cotton cover.
Fig. 6 is a cross-sectional view of a second sound absorbing cotton cover.
The sound-absorbing foam cover comprises a 1-shell, a 2-first end cover, a 3-second end cover, a 4-first partition board, a 4-1-third through hole, a 5-second partition board, a 6-third partition board, a 6-1-fourth through hole, a 7-first cavity, an 8-second cavity, a 9-third cavity, a 10-fourth cavity, an 11-air inlet pipe, an 11-1-first pipe body, an 11-2-second pipe body, a 12-fifth pipe body, a 13-fourth pipe body, a 14-left exhaust pipe, a 14-1-first through hole, a 15-right exhaust pipe, a 15-1-second through hole, a 16-first sound-absorbing foam cover, a 16-1-fifth through hole, a 17-second sound-absorbing foam cover, a 17-1-sixth through hole, an 18-first pipe body, a 19-second pipe body and a 20-third pipe body.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
as shown in fig. 1, the present invention is a muffler with double exhaust pipes, comprising a casing 1 with an oval cross section, a first end cover 2 and a second end cover 3 respectively fixed at two ends of the casing 1, a first partition plate 4, a second partition plate 5, a third partition plate 6, an air inlet pipe 11, a left exhaust pipe 14, a right exhaust pipe 15 and a plurality of flow guiding pipes which are arranged in the casing 1 at intervals along the axial direction of the casing 1. The edges of the first partition board 4, the second partition board 5 and the third partition board 6 are respectively provided with a flanging, and the first partition board 4 and the third partition board 6 are also provided with third through holes 4-1 (see fig. 2) and fourth through holes 6-1 (see fig. 4) which are uniformly distributed, wherein the diameter of the third through holes 4-1 is larger than that of the fourth through holes 6-1. A first chamber 7 is formed between the first end cover 2 and the first partition board 4, a second chamber 8 is formed between the first partition board 4 and the second partition board 5, a third chamber 9 is formed between the second partition board 5 and the third partition board 6, and a fourth chamber 10 is formed between the third partition board 6 and the second end cover 3.
The air inlet pipe 11 is L-shaped and comprises a first pipe body 11-1 parallel to the axis of the shell 1, a second pipe body 11-2 perpendicular to the first pipe body 11-1, and a first flow guiding pipe 18, a second flow guiding pipe 19 and a third flow guiding pipe 20 welded inside the tail end of the first pipe body 11-1 (see fig. 3). Wherein the second pipe 11-2 is located in the first chamber 7, and the first pipe 11-1 penetrates through the first partition board 4, the second partition board 5 and the third partition board 6 to be communicated with the fourth chamber 10. The outer diameters of the first guide pipe 18, the second guide pipe 19 and the third guide pipe 20 are equal and tangential to each other, so that low-frequency noise can be effectively reduced, and tail pipe knocking is prevented.
In order to achieve a good middle-low frequency silencing effect, a fourth flow guide pipe 13 with two ends communicated with the first chamber 7 and the fourth chamber 10 is fixedly penetrated on the first partition board 4; the first baffle plate 4, the second baffle plate 5 and the third baffle plate 6 are also fixedly penetrated by a fifth flow guide pipe 12 with two ends communicated with the first chamber 7 and the second chamber 8; wherein, the liquid crystal display device comprises a liquid crystal display device,
the outer diameter of the fifth guide pipe 12 is smaller than the outer diameter of the fourth guide pipe 13. The air flow enters the fourth chamber 10 from the air inlet pipe 11, flows into the first chamber 7 through the fourth flow guide pipe 13, flows into the second chamber 8 through the third through hole 4-1 and the fifth flow guide pipe 12 on the first partition board 4, and finally flows out of the left exhaust pipe 14 and the right exhaust pipe 15. The fifth guide pipe 12 and the second chamber 8 cooperate to be equal to a helmz muffler, and is mainly used for low-frequency noise reduction; this part constitutes three-pipe labyrinth muffler, helps eliminating middle-low frequency band noise.
The left exhaust pipe 14 passes through and is fixed on the first partition board 4 and the first end cover 2, two ends of the left exhaust pipe are respectively communicated with the second chamber 8 and the external atmosphere, the right exhaust pipe 15 passes through and is regulated on the second partition board 5, the third partition board 6 and the second end cover 3, and two ends of the right exhaust pipe are respectively communicated with the second chamber 8 and the external atmosphere. The left exhaust pipe 12, the right exhaust pipe 15, the second pipe body 11-2 and the flow guiding pipes are all parallel. The left exhaust pipe 14 is provided with a first through hole 14-1 on the pipe wall positioned in the first chamber 7, the right exhaust pipe 15 is provided with a second through hole 15-1 on the pipe wall positioned in the fourth chamber 10, and the apertures and the numbers of the first through hole 14-1 and the second through hole 15-1 are equal. The left exhaust pipe 14 is sleeved with a first sound-absorbing cotton cover 16 at the position of the first through hole 14-1, and the right exhaust pipe 15 is sleeved with a second sound-absorbing cotton cover 17 at the position of the second through hole 15-1. The first sound-absorbing cotton cover 16 is provided with uniformly distributed fifth through holes 16-1 (see fig. 5), and the second sound-absorbing cotton cover 17 is provided with uniformly distributed sixth through holes 17-1 (see fig. 6). The first sound-absorbing cotton cover 16, the second sound-absorbing cotton cover 17 and the third chamber 9 are filled with sound-absorbing cotton, so that middle-high frequency noise can be effectively eliminated.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention, and those skilled in the art may easily modify or substitute the present invention, and these embodiments are included in the scope of the present invention.
Claims (10)
1. The double exhaust pipe muffler comprises a shell, a first end cover, a second end cover, a first partition plate, a second partition plate, a third partition plate, an air inlet pipe, a left exhaust pipe, a right exhaust pipe and a plurality of flow guide pipes, wherein the first end cover and the second end cover are respectively fixed at two ends of the shell; the method is characterized in that: the air inlet pipe is L-shaped and comprises a first pipe body parallel to the axis of the shell, a second pipe body perpendicular to the first pipe body, and a first flow guide pipe, a second flow guide pipe and a third flow guide pipe which are welded inside the tail end of the first pipe body, wherein the second pipe body is positioned in the first cavity, and the first pipe body penetrates through the first partition plate, the second partition plate and the third partition plate respectively to be communicated with the fourth cavity; the first partition plate is also fixedly penetrated by a fifth flow guide pipe with two ends communicated with the first cavity and the second cavity, and the fifth flow guide pipe and the second cavity are jointly used for low-frequency silencing; the first baffle plate, the second baffle plate and the third baffle plate are also fixedly penetrated by a fourth flow guide pipe with two ends communicated with the first chamber and the fourth chamber; the left exhaust pipe penetrates through and is fixed on the first partition board and the first end cover respectively, and two ends of the left exhaust pipe are communicated with the second chamber and the external atmosphere respectively; the right exhaust pipe penetrates through and is fixed on the second partition board, the third partition board and the second end cover respectively, and two ends of the right exhaust pipe are communicated with the second chamber and the external atmosphere respectively; the left exhaust pipe is located a plurality of first through holes are evenly arranged on the pipe wall in the first cavity, the right exhaust pipe is located a plurality of second through holes are evenly arranged on the pipe wall in the fourth cavity, the left exhaust pipe is sleeved with a first sound-absorbing cotton cover at the position of the first through hole, the right exhaust pipe is sleeved with a second sound-absorbing cotton cover at the position of the second through hole, and sound-absorbing cotton used for eliminating medium-high frequency noise is filled in the first sound-absorbing cotton cover, the second sound-absorbing cotton cover and the third cavity.
2. The double exhaust muffler as defined in claim 1, wherein: the first pipe body, the left exhaust pipe, the right exhaust pipe and the honeycomb ducts are all parallel to the axis of the shell.
3. The double exhaust muffler as defined in claim 1, wherein: the edges of the first baffle, the second baffle and the third baffle are provided with flanging.
4. The double exhaust muffler as claimed in claim 1 or 2, wherein: the outer diameters of the first guide pipe, the second guide pipe and the third guide pipe are equal and tangential to each other.
5. The double exhaust muffler as defined in claim 1, wherein: the outer diameter of the fifth flow guide pipe is smaller than that of the fourth flow guide pipe.
6. The double exhaust muffler according to any one of claims 1 to 3 and claim 5, wherein: the outer diameters and the number of the first through holes and the second through holes are equal.
7. The double exhaust muffler as defined in claim 4, wherein: the outer diameters and the number of the first through holes and the second through holes are equal.
8. The double exhaust muffler as defined in claim 1, wherein: the first partition plate and the third partition plate are respectively provided with a third through hole and a fourth through hole which are uniformly distributed, and the diameter of the third through hole is larger than that of the fourth through hole.
9. The double exhaust muffler as defined in claim 1, wherein: the first sound-absorbing cotton cover and the second sound-absorbing cotton cover are respectively provided with a plurality of fifth through holes and sixth through holes which are uniformly distributed.
10. The double exhaust muffler as defined in claim 1, wherein: the cross section of the shell is elliptic.
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 CN107120165A (en) | 2017-09-01 |
| CN107120165B true 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) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104904B (en) * | 2018-01-18 | 2020-09-11 | 河南中盛汽配科技股份有限公司 | Silencer with adjusting function |
| CN108590811A (en) * | 2018-04-12 | 2018-09-28 | 柳州利和排气控制***有限公司 | Motor vehicle exhaust muffler |
| 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 |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101262612B1 (en) * | 2012-02-16 | 2013-05-08 | 현대자동차주식회사 | Horizontally installed muffer having sporty tone |
| KR20140080644A (en) * | 2012-12-12 | 2014-07-01 | 기아자동차주식회사 | 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 |
| CN207033563U (en) * | 2017-07-11 | 2018-02-23 | 华南理工大学 | A kind of twin exhaust pipes silencer |
-
2017
- 2017-07-11 CN CN201710563220.9A patent/CN107120165B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107120165A (en) | 2017-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107120165B (en) | Double exhaust pipe muffler | |
| CN111777043A (en) | Mute oxygen generator | |
| CN104265409A (en) | High-frequency-removal exhaust silencer | |
| CN212450621U (en) | Mute oxygen generator | |
| CN207033563U (en) | A kind of twin exhaust pipes silencer | |
| CN210134990U (en) | Silencer, exhaust equipment and exhaust system with dynamic sound | |
| CN209855880U (en) | Exhaust silencer for racing car | |
| CN116292180A (en) | Muffler for compressor and compressor | |
| CN210509512U (en) | Air compressor exhaust muffler | |
| CN111075537A (en) | Silencing device for cold end of automobile exhaust system | |
| CN102606268A (en) | Reactive muffler for engineering machine | |
| CN108386253B (en) | Loader amortization mechanism | |
| CN211874577U (en) | Exhaust silencer for formula car | |
| KR101692579B1 (en) | Muffler for Vehicle with Multi Path | |
| CN204175364U (en) | A kind of circular automobile exhaust gas Sound Attenuator | |
| CN216666042U (en) | Noise elimination structure and ventilation treatment equipment | |
| CN204591406U (en) | A kind of passenger car premuffler | |
| CN210977634U (en) | Exhaust silencer with double-air-outlet multi-pipe labyrinth structure | |
| CN212538245U (en) | Microporous plate pipeline silencer | |
| CN211116191U (en) | Silencer | |
| CN210921758U (en) | Air conditioner silencer | |
| CN218118142U (en) | Noise silencer | |
| CN216110919U (en) | Low smoke type automobile silencer assembly | |
| CN217685828U (en) | Silencer and air conditioner with same | |
| CN212717402U (en) | Bypass silencer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |