CN110671182B - Tail gas noise treatment device for fuel automobile - Google Patents

Tail gas noise treatment device for fuel automobile Download PDF

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Publication number
CN110671182B
CN110671182B CN201910899569.9A CN201910899569A CN110671182B CN 110671182 B CN110671182 B CN 110671182B CN 201910899569 A CN201910899569 A CN 201910899569A CN 110671182 B CN110671182 B CN 110671182B
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China
Prior art keywords
exhaust pipe
end surface
conical
conical barrel
circular ring
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CN201910899569.9A
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Chinese (zh)
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CN110671182A (en
Inventor
唐�谦
任世平
孙小刚
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Hunan Institute of Engineering
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Hunan Institute of Engineering
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Priority to CN201910899569.9A priority Critical patent/CN110671182B/en
Publication of CN110671182A publication Critical patent/CN110671182A/en
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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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • 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
    • 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
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/18—Silencing apparatus characterised by method of silencing by using movable parts having rotary movement
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
    • 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
    • F01N2240/06—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 an inertial, e.g. centrifugal, device
    • 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
    • F01N2240/20—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 flow director or deflector
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure

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  • 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 relates to a tail gas noise treatment device for a fuel oil automobile, which comprises an exhaust pipe of the automobile, wherein a plurality of first through holes are uniformly distributed on the side surface of the exhaust pipe, a first conical cylinder is arranged on the inner side of the exhaust pipe, the large end surface of the first conical cylinder is in contact fit with the inside of the exhaust pipe, a second conical cylinder is arranged on the inner side of the first conical cylinder, the small end surface of a third conical cylinder is fixedly connected with a sleeve, and a plurality of countersunk holes are uniformly formed on the outer side of the third conical cylinder. The efficiency of engine is promoted, energy saving and emission reduction, and the exhaust pipe can also be protected to a certain extent to the reduction tail gas noise.

Description

Tail gas noise treatment device for fuel automobile
Technical Field
The invention belongs to the field of noise treatment devices, and particularly relates to a tail gas noise treatment device for a fuel automobile.
Background
The quantity of automobiles in China is getting larger, people's requirements on automobiles are no longer only vehicles, the automobiles are more required to be energy-saving, environment-friendly, attractive and comfortable, the traffic noise of motor vehicles is a main source of urban road noise, noise regulations for automobiles are stricter, however, when general silencers are produced and processed, resistive silencers and reactive silencers which are mainly applied in the market at present can only treat high-frequency or medium-low-frequency noise independently, the application range is not wide, and in terms of the resistive silencers: in the gas with high temperature, vapor and corrosive action on sound absorption materials, the muffler has short service life and poor effect on low-frequency noise; the biggest disadvantage is that the power loss of the silencer is overlarge; moreover, the filtering holes of a common single silencer have unobvious noise treatment effect, thereby influencing the efficiency of the whole silencing process.
Disclosure of Invention
The invention provides a tail gas noise treatment device for a fuel automobile, which is used for solving the defects in the prior art.
The invention is realized by the following technical scheme:
a tail gas noise processing device for a fuel oil automobile comprises an exhaust pipe of the automobile, wherein a plurality of first through holes are uniformly distributed on the side surface of the exhaust pipe along the axis direction, a first conical barrel is arranged on the inner side of the exhaust pipe, the small end surface of the first conical barrel faces backwards, the large end surface of the first conical barrel is in contact fit with the inside of the exhaust pipe, a second conical barrel is arranged on the inner side of the first conical barrel, the large end surface of the second conical barrel is fixedly connected with the small end surface of the first conical barrel, the small end surface of the second conical barrel faces forwards, a plurality of threaded holes are uniformly formed in the middle of the side surface of the first conical barrel, a plurality of second through holes are uniformly formed in the side surface of the second conical barrel, a rotating shaft is arranged on the small end surface of the second conical barrel, the small end surface of the second conical barrel is connected with the front end of the rotating shaft through a bearing, the rear end of, the end face rotates with the big terminal surface of second toper section of thick bamboo before first ring inboard to be connected, blast pipe inboard installation second ring, the inboard fixed connection of second blade and second ring is passed through in the first ring outside, the second blade is the acute angle for first ring terminal surface, the second ring outside rotates with the blast pipe inboard to be connected, blast pipe outside bottom fixed mounting sleeve, sleeve top installation third toper section of thick bamboo, the little terminal surface of third toper section of thick bamboo and sleeve fixed connection, several counter sink hole is evenly seted up in the third toper section of thick bamboo outside, mounting bolt in the counter sink, the bolt is through the first through-hole that corresponds, with the screw hole fastening connection that corresponds.
According to the tail gas noise treatment device for the fuel-oil automobile, the sleeve is fixedly connected with the exhaust pipe through the threads.
According to the tail gas noise treatment device for the fuel automobile, the plurality of circular grooves are uniformly distributed on the inner side surface of the first conical cylinder.
According to the tail gas noise processing device for the fuel automobile, the fourth conical cylinder is installed at the bottom of the sleeve, the large end face of the fourth conical cylinder is fixedly connected with the sleeve, and the small end face of the fourth conical cylinder faces downwards.
According to the exhaust gas noise treatment device for the fuel-powered automobile, the surface of the fourth conical cylinder is plated with chrome.
The invention has the advantages that: the invention is suitable for reducing noise of tail gas of an automobile, air is blown into the device from the large end surface of a third conical cylinder in the running process of the automobile and reaches an exhaust pipe through a first through hole, the air blows through a second blade in the middle of a circular ring, the second blade is driven to rotate when the air blows because the second blade is inclined along the axial direction, the second blade rotates to drive the circular ring to rotate, the circular ring drives a rotating shaft through a connecting rod, the rotating shaft rotates to drive the first blade to rotate, because the tail gas is discharged outwards in the running process of the automobile, the first blade rotates to suck the waste gas discharged from the exhaust pipe of the automobile, the tail gas can be discharged better, the waste gas discharged from an engine is discharged from the exhaust pipe through a pipeline in the using process of the automobile, the power output of the engine can be influenced when the tail gas is discharged smoothly, and the resistance of the tail gas discharge can be reduced by sucking the tail gas, thereby reducing the work of the engine to overcome the exhaust emission, improving the output power of the engine, the power of the engine can be improved, the energy-saving effect can be realized, the discharged tail gas passes through the large end surface of the first conical cylinder, the tail gas passes through the middle of the circular ring through the second through hole, then the noise is discharged into the atmosphere and follows the tail gas, the noise passes through the rotating first blade, the energy of the sound wave is reduced, the sound wave is reflected in the first conical barrel, the energy of the sound wave is reduced again, thereby reducing the noise, when needing to be disassembled, screwing out the bolt, taking down the sleeve, taking out the circular ring, the first conical barrel, the second conical barrel and the rotating shaft in the exhaust pipe, the device simple structure makes things convenient for the dismouting, can improve the emission of tail gas, promotes the efficiency of engine, and energy saving and emission reduction reduces the tail gas noise and can also protect the blast pipe to a certain extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention; fig. 2 is a partially enlarged view of fig. 1 taken along line a-a.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
A tail gas noise processing device for a fuel oil automobile comprises an exhaust pipe 1 of the automobile, wherein a plurality of first through holes 2 are uniformly distributed on the side surface of the exhaust pipe 1 along the axis direction, a first conical barrel 3 is arranged on the inner side of the exhaust pipe 1, the small end surface of the first conical barrel 3 faces backwards, the large end surface of the first conical barrel 1 is in contact fit with the inside of the exhaust pipe 1, a second conical barrel 4 is arranged on the inner side of the first conical barrel 3, the large end surface of the second conical barrel 4 is fixedly connected with the small end surface of the first conical barrel 3, the small end surface of the second conical barrel 4 faces forwards, a plurality of threaded holes 5 are uniformly formed in the middle part of the side surface of the first conical barrel 3, a plurality of second through holes 6 are uniformly formed in the side surface of the second conical barrel 4, a rotating shaft 7 is arranged on the small end surface of the second conical barrel 4, the small end surface of the second conical barrel 4 is, a first circular ring 9 is installed at the bottom of a rotating shaft 7, the inner side of the first circular ring 9 is fixedly connected with the bottom of the rotating shaft 7 through uniformly distributed connecting rods 10, the front end face of the inner side of the first circular ring 9 is rotatably connected with the large end face of a second conical cylinder 4, a second circular ring 17 is installed on the inner side of an exhaust pipe 1, the outer side of the first circular ring 9 is fixedly connected with the inner side of the second circular ring 17 through second blades 11, the second blades 11 are acute-angled relative to the end face of the first circular ring 9, the outer side of the second circular ring 17 is rotatably connected with the inner side of the exhaust pipe 1, a sleeve 12 is fixedly installed at the bottom of the outer side of the exhaust pipe 1, a third conical cylinder 13 is installed at the top of the sleeve 12, the small end face of the third conical cylinder 13 is fixedly connected with the sleeve 12, a plurality of countersunk holes 14 are uniformly formed in the outer side of the third conical cylinder 13, bolts. The invention is suitable for reducing noise of automobile exhaust, air is blown into the device from the large end face of the third conical cylinder 13 in the running process of an automobile and reaches the exhaust pipe 1 through the first through hole 2, the air blows through the second blade 11 in the middle of the circular ring 9, the second blade 11 is driven to rotate when the air blows because the second blade 11 inclines along the axial direction, the rotation of the second blade 11 drives the circular ring 9 to rotate, the circular ring 9 drives the rotating shaft 7 through the connecting rod 10, the rotating shaft 7 drives the first blade 8 to rotate, because the automobile exhausts the exhaust in the running process, the exhaust emitted from the exhaust pipe 1 is sucked out by the rotation of the first blade 8, the exhaust can be exhausted better, the exhaust gas emitted from an engine is exhausted from the exhaust pipe through a pipeline in the use process of the motor vehicle, when the exhaust gas is exhausted smoothly, the power output of the engine can be influenced, the device can reduce the resistance of exhaust gas exhaust by sucking the exhaust gas, thereby reducing the work of the engine to overcome the exhaust gas exhaust, thereby improving the output power of the engine, improving the power of the engine, and realizing the energy-saving effect, the exhaust gas passes through the large end surface of the first conical barrel 3, the exhaust gas passes through the middle of the circular ring 9 through the second through hole 6 and is exhausted to the atmosphere, following the exhaust gas exhaust, the noise is also exhausted through the rotating first blade 8, the sound wave energy is reduced, the sound wave energy is reflected in the first conical barrel 3, the sound wave energy is reduced again, thereby reducing the noise, when needing to be disassembled, the bolt 15 is screwed out, the sleeve 12 is taken out, then the circular ring 9 in the exhaust pipe, the first conical barrel 3, the second conical barrel 4 and the rotating shaft 7 are taken out, the device has simple structure, is convenient to disassemble and assemble, and can improve the exhaust gas exhaust, the efficiency of engine is promoted, energy saving and emission reduction, and the exhaust pipe can also be protected to a certain extent to the reduction tail gas noise.
Specifically, as shown in the drawing, the sleeve 12 according to the present embodiment is fixedly connected to the exhaust pipe 1 by a screw. The device can be guaranteed to be convenient to assemble and disassemble through the design.
Specifically, as shown in the figure, a plurality of circular grooves are uniformly distributed on the inner side surface of the first conical cylinder 3. This design can let the sound wave reflection round trip better, will weaken the absorption from the noise that tail gas exhaust comes.
Further, as shown in the figure, a fourth tapered cylinder 16 is installed at the bottom of the sleeve 12 in the embodiment, a large end face of the fourth tapered cylinder 16 is fixedly connected with the sleeve 12, and a small end face of the fourth tapered cylinder 16 faces downward. This design can play limiting displacement, guarantees that the device is better fixes on blast pipe 1.
Further, as shown, the fourth tapered barrel 16 of the present embodiment is chrome plated. The surface of the exhaust pipe 1 can be better protected through the design, and the design is more attractive.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (4)

1. The utility model provides a tail gas noise processing apparatus for fuel automobile which characterized in that: comprises an exhaust pipe (1) of an automobile, a plurality of first through holes (2) are uniformly distributed on the side surface of the exhaust pipe (1) along the axis direction, a first conical barrel (3) is arranged on the inner side of the exhaust pipe (1), the small end surface of the first conical barrel (3) faces backwards, the large end surface of the first conical barrel (1) is in contact fit with the interior of the exhaust pipe (1), a second conical barrel (4) is arranged on the inner side of the first conical barrel (3), the large end surface of the second conical barrel (4) is fixedly connected with the small end surface of the first conical barrel (3), the small end surface of the second conical barrel (4) faces forwards, a plurality of threaded holes (5) are uniformly formed in the middle part of the side surface of the first conical barrel (3), a plurality of second through holes (6) are uniformly formed in the side surface of the second conical barrel (4), a rotating shaft (7) is arranged on the small end surface of the second conical barrel (4), the small end surface of the second conical barrel, the top of the rotating shaft (7) is uniformly and fixedly provided with a first blade (8), the bottom of the rotating shaft (7) is provided with a first circular ring (9), the inner side of the first circular ring (9) is fixedly connected with the bottom of the rotating shaft (7) through uniformly distributed connecting rods (10), the front end surface of the inner side of the first circular ring (9) is rotatably connected with the large end surface of the second conical cylinder (4), the inner side of the exhaust pipe (1) is provided with a second circular ring (17), the outer side of the first circular ring (9) is fixedly connected with the inner side of the second circular ring (17) through a second blade (11), the second blade (11) is in an acute angle relative to the end surface of the first circular ring (9), the outer side of the second circular ring (17) is rotatably connected with the inner side of the exhaust pipe (1), the bottom of the outer side of the exhaust pipe (1) is fixedly provided with a sleeve (12), the top of the sleeve (12) is provided with a third conical cylinder (13), the small end surface of the third conical cylinder (13) is fixedly connected, bolts (15) are installed in the counter bores (14), the bolts (15) are fixedly connected with corresponding threaded holes (5) through corresponding first through holes (2), and the sleeves (12) are fixedly connected with the exhaust pipe (1) through threads.
2. The exhaust gas noise processing device for the fuel-powered automobile according to claim 1, characterized in that: a plurality of circular grooves are uniformly distributed on the inner side surface of the first conical cylinder (3).
3. The exhaust gas noise processing device for the fuel-powered automobile according to claim 1, characterized in that: the bottom of the sleeve (12) is provided with a fourth conical cylinder (16), the large end face of the fourth conical cylinder (16) is fixedly connected with the sleeve (12), and the small end face of the fourth conical cylinder (16) faces downwards.
4. The exhaust gas noise processing device for the fuel-powered automobile according to claim 3, characterized in that: the surface of the fourth conical cylinder (16) is plated with chrome.
CN201910899569.9A 2019-09-23 2019-09-23 Tail gas noise treatment device for fuel automobile Active CN110671182B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910899569.9A CN110671182B (en) 2019-09-23 2019-09-23 Tail gas noise treatment device for fuel automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910899569.9A CN110671182B (en) 2019-09-23 2019-09-23 Tail gas noise treatment device for fuel automobile

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CN110671182A CN110671182A (en) 2020-01-10
CN110671182B true CN110671182B (en) 2021-04-23

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2089077U (en) * 1991-04-11 1991-11-20 林贞群 Tail pipe of engine with tail gas exhausting function
CN1865677A (en) * 2006-01-23 2006-11-22 王勇 Multifunctional silencer
CN201246206Y (en) * 2008-05-21 2009-05-27 周杨明 Internal combustion engine spiral vortex horn type silencer
CN201412208Y (en) * 2009-06-09 2010-02-24 郑邑明 Muffler
CN106640285A (en) * 2016-12-06 2017-05-10 济南吉美乐电源技术有限公司 Air-discharging, flow-mixing and cooling infrared stealth device for electric power plant with internal combustion engine
CN107288846A (en) * 2017-08-15 2017-10-24 芜湖通全科技有限公司 One kind turns to cut frequency type muffler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2089077U (en) * 1991-04-11 1991-11-20 林贞群 Tail pipe of engine with tail gas exhausting function
CN1865677A (en) * 2006-01-23 2006-11-22 王勇 Multifunctional silencer
CN201246206Y (en) * 2008-05-21 2009-05-27 周杨明 Internal combustion engine spiral vortex horn type silencer
CN201412208Y (en) * 2009-06-09 2010-02-24 郑邑明 Muffler
CN106640285A (en) * 2016-12-06 2017-05-10 济南吉美乐电源技术有限公司 Air-discharging, flow-mixing and cooling infrared stealth device for electric power plant with internal combustion engine
CN107288846A (en) * 2017-08-15 2017-10-24 芜湖通全科技有限公司 One kind turns to cut frequency type muffler

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