CN111335983A - Diesel engine tail gas treatment device - Google Patents
Diesel engine tail gas treatment device Download PDFInfo
- Publication number
- CN111335983A CN111335983A CN202010331485.8A CN202010331485A CN111335983A CN 111335983 A CN111335983 A CN 111335983A CN 202010331485 A CN202010331485 A CN 202010331485A CN 111335983 A CN111335983 A CN 111335983A
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- China
- Prior art keywords
- pipe
- incineration
- tail gas
- communicated
- melting
- 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.)
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
-
- 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
- F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
-
- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
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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
- 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
-
- 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
- F01N3/18—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 methods of operation; Control
- F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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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
- 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
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F01N2230/00—Combination of silencers and other devices
- F01N2230/04—Catalytic converters
-
- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/04—Combinations of different methods of purification afterburning and catalytic conversion
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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
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention discloses a diesel engine tail gas treatment device, which comprises a tail gas pipe arranged on an incineration pipe, wherein an igniter, a smoke detector and a one-way gas inlet pipe are fixedly arranged on the incineration pipe, an injection pipe positioned in the incineration pipe is fixedly arranged on the igniter through a guide pipe, a filter screen is fixedly arranged on the incineration pipe through a gas guide pipe, a melting pipe communicated with the gas guide pipe is arranged on the combustion pipe through a fixing mechanism, two heating mechanisms are arranged in the melting pipe, the melting pipe is communicated with two spraying pipes through a feed pipe, the melting pipe is communicated with a silencing pipe through a gas transmission pipe, and the silencing pipe is provided with a gas exhaust pipe through a plurality of condensing mechanisms. Has the advantages that: reasonable in design, simple structure can effectual processing carbon particle and the oxynitrides that contain in the tail gas to can reduce noise and the high temperature that the diesel engine during operation produced, the suitability is strong, practical wide range.
Description
Technical Field
The invention relates to the technical field of diesel tail gas treatment, in particular to a diesel tail gas treatment device.
Background
The diesel engine uses diesel oil as fuel, can produce a large amount of industrial tail gas during its work, for avoiding directly discharging the pollution that causes the air, can utilize tail gas processing apparatus to handle tail gas before discharging.
The treatment effect of current tail gas processing apparatus is comparatively single, and the tail gas treatment effect is not ideal enough, and partial device is emphatically handled oxynitrides in the tail gas, and the effect of carbon particle processing to containing in the tail gas is not good, and another partial device is emphatically handled carbon particle and has ignored the processing to oxynitride, and the noise that the diesel engine during operation produced has the part to conduct to the external world along the tail gas pipe, produces noise pollution, consequently need to design a diesel engine tail gas processing apparatus to solve above-mentioned problem urgently.
Disclosure of Invention
The invention aims to solve the problem of single treatment effect in the prior art, and provides a diesel engine tail gas treatment device.
In order to achieve the purpose, the invention adopts the following technical scheme: the invention discloses a diesel engine tail gas treatment device, which comprises a tail gas pipe arranged on an incineration pipe, wherein an igniter, a smoke detector and a one-way gas inlet pipe are fixedly arranged on the incineration pipe, an injection pipe positioned in the incineration pipe is fixedly arranged on the igniter through a guide pipe, a filter screen is fixedly arranged on the incineration pipe through a gas guide pipe, a dissolving pipe communicated with the gas guide pipe is arranged on the combustion pipe through a fixing mechanism, two heating mechanisms are arranged in the dissolving pipe, the dissolving pipe is communicated with two spraying pipes through a feed pipe, a silencing pipe is communicated with the dissolving pipe through a gas transmission pipe, and a gas exhaust pipe is arranged on the silencing pipe through a plurality of condensing mechanisms.
In foretell diesel engine tail gas processing apparatus, fixed establishment is including respectively fixed mounting burn the pipe with dissolve a plurality of fixed blocks on the pipe, and all set up the through-hole on a plurality of fixed blocks, fixes through bolt and nut between two fixed blocks that the position is corresponding.
In the diesel engine exhaust gas treatment device, the heating mechanism is composed of a plurality of heating rods.
In the diesel engine tail gas treatment device, the condensing mechanism comprises an air outlet pipe communicated with the air transmission pipe, the air outlet pipe is composed of an inner pipe and an outer pipe, the outer pipe is filled with the condensate, and one end of the air outlet pipe, which is far away from the air transmission pipe, is communicated with the exhaust pipe.
In the diesel engine exhaust gas treatment device, the spray pipe consists of the water pipe and the spray head, and the spray head is provided with a plurality of pores.
Has the advantages that: the invention has reasonable design and simple structure, can effectively treat carbon particles and oxynitride in tail gas, can reduce noise and high temperature generated during the operation of a diesel engine, and has strong applicability and wide practical range.
Compared with the prior art, the invention has the advantages that:
(1) through setting up burning pipe and some firearms, tail gas can get into in the burning pipe after the tail gas pipe is discharged, and some firearms are igniteed by controller control, can turn into the less carbon dioxide of harm with the not complete burning carbon particle burning that contains in the tail gas, can reduce the pollution to the environment.
(2) Through setting up heating mechanism and spray pipe, heating mechanism can rise to suitable temperature with the temperature that melts in the pipe, can play catalytic reaction's effect, and the spray pipe can spray out the tail gas treatment liquid, can contact the reaction with the oxynitrides in the tail gas after handling via the burning pipe, makes it turn into the less nitrogen gas of harm and oxygen to can play the effect that reduces pollution.
(3) Through setting up hush pipe and condensation mechanism, the cotton effectual noise absorption of inhaling of filling in the hush pipe, and the temperature in the tail gas that condensation mechanism can effectual reduction to can reduce the produced noise of diesel engine during operation and the influence of high temperature to the environment.
Drawings
FIG. 1 is a schematic structural diagram of a diesel engine exhaust treatment device according to the present invention;
FIG. 2 is a side view of the muffler pipe of FIG. 1;
fig. 3 is a schematic perspective view of the spray pipe and the feed pipe.
In the figure: the device comprises a tail gas pipe 1, an incineration pipe 2, a controller 3, an igniter 4, an injection pipe 5, a smoke detector 6, an air guide pipe 7, a fixed block 8, a filter screen 9, a melting pipe 10, a heating mechanism 11, a spraying pipe 12, a feeding pipe 13, an air transmission pipe 14, a silencing pipe 15, an air outlet pipe 16, an air outlet pipe 17 and sound absorption cotton 18.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1-3, the diesel engine tail gas treatment device of the present invention comprises a tail gas pipe 1 installed on an incineration pipe 2, an igniter 4, a smoke detector 6, and a one-way gas inlet pipe are fixedly installed on the incineration pipe 2, an injection pipe 5 located in the incineration pipe 2 is fixedly installed on the igniter 4 through a conduit, a filter screen 9 is fixedly installed on the incineration pipe 2 through a gas conduit 7, a melting pipe 10 communicated with the gas conduit 7 is installed on the incineration pipe 2 through a fixing mechanism, two heating mechanisms 11 are installed in the melting pipe 10, two spraying pipes 12 are communicated in the melting pipe 10 through a feed pipe 13, a silencing pipe 15 is communicated on the melting pipe 10 through a gas conduit 14, sound absorbing cotton 18 is filled in the silencing pipe 15, and a gas exhaust pipe 17 is installed on the silencing pipe 15 through a plurality of condensing mechanisms.
The controller 3 is electrically connected with the igniter 4 and the smoke detector 6, the smoke detector 6 can detect the content of carbon particles contained in the tail gas, the controller 6 can select whether the igniter 4 works or not according to the content of the carbon particles, and the igniter 4 can generate flame and combust the carbon particles to convert the carbon particles into carbon dioxide with less pollution.
The feeding pipe 13 can be communicated with an external tail gas treatment liquid water storage tank, and the tail gas treatment liquid can be in contact reaction with oxynitride in tail gas to convert the tail gas treatment liquid into harmless nitrogen and water vapor.
The incineration pipe 2 is provided with a one-way air inlet pipe for supplementing oxygen in the incineration pipe 2 and preventing insufficient air from occurring during combustion to ensure incomplete combustion, the melting pipe 10 is internally and fixedly provided with a downcomer for recovering unused treatment liquid, and the structure in the incineration pipe 2 is a fireproof and heat-resistant structure.
Fixing mechanism is including respectively fixed mounting burn pipe 2 and dissolve a plurality of fixed blocks 8 on the pipe 10, and all sets up the through-hole on a plurality of fixed blocks 8, fixes through bolt and nut between two fixed blocks 8 that the position is corresponding, and burns pipe 2 and dissolves the part that pipe 10 contacted and install the sealing washer, and fixing mechanism makes burn pipe 2 and dissolves and be detachable installation between the pipe 10, can dismantle it and get off and carry out maintenance and washing respectively.
The spraying pipe 12 is composed of a water pipe and a nozzle, and the nozzle is provided with a plurality of pores, so that the liquid nitrogen treatment liquid can be sprayed out in a atomized state, the contact range of the treatment liquid and the tail gas can be enlarged, and the treatment is more thorough.
The heating mechanism 11 is composed of a plurality of heating rods, which can increase the temperature in the melting pipe 10 and generate a catalytic effect, so that the reaction of the exhaust gas treatment liquid and the oxynitride in the exhaust gas is more sufficient and thorough.
The condensing mechanism comprises an air outlet pipe 16 communicated with the air transfer pipe 14, the air outlet pipe 16 is composed of an inner pipe and an outer pipe, condensate is filled in the outer pipe, one end, far away from the air transfer pipe 14, of the air outlet pipe 16 is communicated with an exhaust pipe 17, tail gas enters from the inner pipe, the condensate absorbs heat contained in the tail gas, the temperature of the tail gas can be reduced, and therefore the greenhouse effect is reduced.
The silencing pipe 15 is filled with sound absorbing cotton 18, and the noise conducted from the exhaust pipe finally enters the silencing pipe 15 through the incineration pipe 2 and the melting pipe 10 and is absorbed by the sound absorbing cotton 18 to a certain extent, so that the noise pollution to the environment can be reduced.
The controller 3 is a PLC controller, the igniter 4 is preferably of the type XXJ-920, the smoke detector 6 is preferably of the type CST-SM2214-C,
in the invention, tail gas enters the incineration pipe 2 through the tail gas pipe 1, at the moment, the concentration of carbon particles contained in the tail gas is detected by the smoke detector 6, if the concentration is too high, a signal is transmitted into the controller 3, the controller 3 controls the igniter 4 to start the ejecting flame to support combustion, the carbon particles are burnt into carbon dioxide and enter the melting pipe 10 together with the rest tail gas, the heating mechanism 11 is used for heating, the treatment liquid is ejected from the spraying pipe 12 through the feeding pipe 13 and fully contacts and reacts with oxynitride in the tail gas, so that the oxynitride is converted into nitrogen and carbon dioxide and enters the gas outlet pipe 16 in the silencing pipe 15 from the gas transmission pipe 14, and the tail gas after silencing treatment by the sound absorption cotton 18 and heat absorption treatment by the condensate is finally discharged to the outside from the gas outlet pipe 17.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A diesel engine tail gas treatment device comprises a tail gas pipe (1) arranged on an incineration pipe (2), it is characterized in that an igniter (4), a smoke detector (6) and a one-way air inlet pipe are fixedly arranged on the incineration pipe (2), an injection pipe (5) positioned in the incineration pipe (2) is fixedly arranged on the igniter (4) through a guide pipe, a filter screen (9) is fixedly arranged on the incineration pipe (2) through an air duct (7), a melting pipe (10) communicated with the gas guide pipe (7) is arranged on the incineration pipe (2) through a fixing mechanism, two heating mechanisms (11) are arranged in the melting pipe (10), two spraying pipes (12) are communicated in the melting pipe (10) through a feeding pipe (13), the melting pipe (10) is communicated with a silencing pipe (15) through an air transmission pipe (14), and the silencing pipe (15) is provided with an exhaust pipe (17) through a plurality of condensing mechanisms.
2. The diesel engine exhaust gas treatment device according to claim 1, wherein the fixing mechanism comprises a plurality of fixing blocks (8) respectively fixedly installed on the incineration pipe (2) and the melting pipe (10), each fixing block (8) is provided with a through hole, and two fixing blocks (8) corresponding to the fixing mechanisms are fixed by bolts and nuts.
3. A diesel exhaust gas treatment device according to claim 1, characterized in that the heating means (11) are constituted by a plurality of heating rods.
4. The diesel engine tail gas treatment device according to claim 1, characterized in that the condensation mechanism comprises an outlet pipe (16) communicated with the gas transmission pipe (14), the outlet pipe (16) is formed by an inner pipe and an outer pipe, the outer pipe is filled with condensate, and one end of the outlet pipe (16) far away from the gas transmission pipe (14) is communicated with an exhaust pipe (17).
5. The diesel engine exhaust gas treatment device according to claim 1, wherein the spray pipe (12) is composed of a water pipe and a nozzle, and the nozzle has a plurality of fine holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010331485.8A CN111335983A (en) | 2020-04-24 | 2020-04-24 | Diesel engine tail gas treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010331485.8A CN111335983A (en) | 2020-04-24 | 2020-04-24 | Diesel engine tail gas treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111335983A true CN111335983A (en) | 2020-06-26 |
Family
ID=71181143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010331485.8A Withdrawn CN111335983A (en) | 2020-04-24 | 2020-04-24 | Diesel engine tail gas treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111335983A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914971A (en) * | 2021-08-16 | 2022-01-11 | 宁波亿超消音科技有限公司 | Silencer |
-
2020
- 2020-04-24 CN CN202010331485.8A patent/CN111335983A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914971A (en) * | 2021-08-16 | 2022-01-11 | 宁波亿超消音科技有限公司 | Silencer |
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Application publication date: 20200626 |
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| WW01 | Invention patent application withdrawn after publication |