CN111043437A - Throttling pressure reduction-impedance composite exhaust emptying silencer - Google Patents
Throttling pressure reduction-impedance composite exhaust emptying silencer Download PDFInfo
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- CN111043437A CN111043437A CN201911306454.0A CN201911306454A CN111043437A CN 111043437 A CN111043437 A CN 111043437A CN 201911306454 A CN201911306454 A CN 201911306454A CN 111043437 A CN111043437 A CN 111043437A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02709—Throttle passages in the form of perforated plates
- F16L55/02718—Throttle passages in the form of perforated plates placed transversely
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0336—Noise absorbers by means of sound-absorbing materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Exhaust Silencers (AREA)
Abstract
本发明公开了一种节流降压‑阻抗复合型排气放空消声器，包括进气部分、消声部分和出气部分，消声部分包括壳体，壳体内沿气体流动方向依次设置节流降压消声腔、抗性共振吸声腔和阻性吸声腔，壳体底部开设排水孔；节流降压消声腔包括设置于进气口处的节流降压管一和节流降压管二，节流降压管二套设于节流降压管一的外部，节流降压管一和节流降压管二的顶端封闭，上半部分开孔，节流降压管一内部水平设置多孔挡板；抗性共振吸声腔内进气端设置一个进气微穿孔管，出气端设置多个出气微穿孔管；阻性吸声腔内设置圆筒形吸声材料。本发明所公开的消声器结构相对简单，适用频带宽，消声量大，吸声材料防水防尘且易于更换。
The invention discloses a throttling and pressure reduction-impedance compound exhaust and venting muffler, which comprises an air inlet part, a muffler part and an air outlet part; The anechoic cavity, the resistive resonance sound absorbing cavity and the resistive sound absorbing cavity are provided with drainage holes at the bottom of the shell; the throttling and decompression muffling cavity includes a throttling and decompression pipe 1 and a throttling and decompression pipe 2 arranged at the air inlet. , the second throttling and pressure-reducing pipe is set outside the first throttling and pressure-reducing pipe, the tops of the first and second throttling and pressure-reducing pipe are closed, the upper part is open, and the inner part of the throttling and pressure-reducing pipe is horizontal Porous baffles are arranged; an inlet micro-perforated tube is arranged at the inlet end of the resistive resonance sound-absorbing cavity, and a plurality of outlet micro-perforated tubes are arranged at the gas outlet; a cylindrical sound-absorbing material is arranged in the resistive sound-absorbing cavity. The muffler disclosed by the invention is relatively simple in structure, has a wide applicable frequency band, a large amount of noise reduction, and the sound absorbing material is waterproof and dustproof, and is easy to replace.
Description
Technical Field
The invention belongs to the technical field of silencers, and particularly relates to a throttling and voltage-reducing-impedance composite exhaust emptying silencer.
Background
The air separation tower top exhaust pipe mouth of the oxygen making plant regularly discharges and makes gases such as compressed air, steam, because the gas velocity of flow is big, the pressure is high, produces very big emptying noise in the exhaust process, makes the interior or even outside the factory environmental noise exceed standard, harms the safety of worker in the factory, the off-site resident. When the noise reaches five decibels and sixty decibels, people feel uncomfortable and influence thinking and mental concentration; above eight and ninety decibels, the health of the person is affected: prolonged exposure to loud noise can also lead to hearing loss or noise-induced deafness, and even to certain diseases, affecting daily life. The noise frequency spectrum is wide, the intensity is large, the transmission range is wide, the high-frequency characteristic is very outstanding, but the influence of medium-low frequency noise is also large.
In the existing exhaust emptying muffler, in order to pursue high noise reduction, a throttling pressure reduction and resistive composite muffler is often adopted, but the structure is very complex and the process is complicated. The resistance sound absorption material is not easy to replace, and cannot be rain-proof and dustproof, so that the sound absorption performance of the resistance sound absorption material is further reduced along with the time change, more importantly, the sound absorption material cannot have a good noise elimination effect on the middle and low frequency noise, and the requirement of exhausting, emptying and noise reduction of an air separation tower of an oxygen plant cannot be met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a throttling pressure reduction-impedance composite exhaust emptying silencer so as to achieve the purposes of relatively simple structure, wide applicable frequency band, large silencing quantity, waterproof and dustproof sound absorption materials and easiness in replacement.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a throttling pressure reduction-impedance composite exhaust emptying silencer comprises an air inlet part, a silencing part and an air outlet part, wherein the silencing part comprises a shell, a throttling pressure reduction silencing cavity, a resistant resonance silencing cavity and a resistant silencing cavity are sequentially arranged in the shell along the air flowing direction, and a drain hole is formed in the bottom of the shell;
the throttling pressure reducing and silencing cavity comprises a throttling pressure reducing pipe I and a throttling pressure reducing pipe II which are arranged at an air inlet, the throttling pressure reducing pipe II is sleeved outside the throttling pressure reducing pipe I, the top ends of the throttling pressure reducing pipe I and the throttling pressure reducing pipe II are closed, the upper half part of the throttling pressure reducing pipe I is provided with a hole, and a porous baffle is horizontally arranged inside the throttling pressure reducing pipe I;
an air inlet micro perforated pipe is arranged at the air inlet end in the resistant resonance sound absorption cavity, and a plurality of air outlet micro perforated pipes are arranged at the air outlet end;
and a cylindrical sound absorption material is arranged in the resistive sound absorption cavity.
In the scheme, the air inlet part comprises a conical expansion pipe connected with the throttling depressurization pipe I, the bottom of the conical expansion pipe is provided with a connecting flange, the air outlet part comprises a conical contraction pipe connected with the shell, and the top of the conical contraction pipe is provided with a rain shield.
In a further technical scheme, the diameter of an air outlet at the top of the conical expansion pipe is 1.5 times of that of an air inlet at the bottom, and the diameter of an air inlet at the bottom of the conical contraction pipe is 1.5 times of that of the air outlet at the top.
In the above scheme, the casing inside wall sets up the perforation mask pipe, be equipped with the sound absorbing layer between casing and the perforation mask pipe.
In a further technical scheme, the cylindrical sound absorption material comprises a cylindrical aluminum alloy thin-wall pipe and centrifugal glass wool arranged in the cylindrical aluminum alloy thin-wall pipe, the wall thickness of the cylindrical aluminum alloy thin-wall pipe is 1mm, and the density of the centrifugal glass wool is 36kg/m3The centrifugal glass wool is externally coated with glass fiber cloth and polyethylene film.
In a further technical scheme, the bottom of the cylindrical aluminum alloy thin-wall pipe is welded on the perforated protective surface pipe through a cross support frame, and the top support frame is connected on the perforated protective surface pipe through a bolt.
In the scheme, the first throttling depressurization pipe is provided with a hole with the diameter of 5mm, and the perforation rate is 20%; and the second throttling depressurization pipe is provided with holes with the diameter of 10mm, and the perforation rate is 30%.
In the scheme, the porous baffle is a steel porous plate with the thickness of 1mm, the aperture is 10mm, and the perforation rate is 20%.
In the scheme, the aperture of the inlet micro-perforated pipe and the aperture of the outlet micro-perforated pipe are both 1mm, and the perforation rate is both 5%.
In the scheme, the first throttling depressurization pipe and the second throttling depressurization pipe share the same axis with the shell, the distance between the two pipe walls is 60mm, and the bottom ends of the two pipes are welded with the bottom of the shell.
Through the technical scheme, the throttling decompression-impedance composite exhaust emptying muffler provided by the invention has the following beneficial effects:
1. the conical expansion pipe decelerates the high-speed gas before it enters the muffler barrel.
2. The silencer is provided with the multi-stage throttling pressure reducing pipes, so that the airflow jetting noise can be obviously reduced.
3. The resistance resonance sound absorption cavity can obviously reduce the middle and low frequency noise in the exhaust emptying noise, so that the exhaust pressure is further reduced.
4. The resistive sound absorption cavity and the sound absorption layer on the inner wall of the shell greatly improve high-frequency noise in exhaust noise, and meanwhile, the flowing direction of air flow tends to be stable.
5. The resistive sound absorption cavity sound absorption material is coated with the rainproof film, so that the material is waterproof and dustproof, and the service life of the material can be prolonged.
6. The opening of the air outlet pipeline of the silencer is provided with the rain baffle plate which can shield most of rainwater, and the bottom of the silencer shell is provided with the drain hole which can enable a small amount of rainwater entering the silencer to be discharged in time so as not to block the sound-absorbing material on the inner wall of the shell and influence the sound-absorbing effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic view of an external structure of a throttle pressure reduction-impedance composite exhaust and evacuation muffler according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the interior of the throttle step-down-impedance hybrid exhaust venting muffler as disclosed in an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 2;
fig. 5 is a schematic structural diagram of a reactive resonance sound absorption cavity.
In the figure, 1, a housing; 2. a connecting flange; 3. a conical expansion tube; 4. a U-shaped support; 5. a conical shrink tube; 6. a porous baffle; 7. a first throttling perforated pipe; 8. a second throttling perforated pipe; 9. perforating a surface protection pipe; 10. a sound absorbing layer; 11. an air inlet microperforated tube; 12. an air outlet micro-perforated pipe; 13. a cross support frame; 14. a resistive acoustic cavity; 15. a rain shield; 16. a resistant resonant acoustic cavity; 17. a resonant cavity partition; 18. a drain hole; 19. a support frame; 20. a throttling pressure-reducing silencing cavity; 21. a cylindrical aluminum alloy thin-walled tube; 22. and (4) centrifuging the glass wool.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a throttling pressure reduction-impedance composite exhaust emptying silencer, which is relatively simple in structure, wide in applicable frequency band, large in silencing quantity, waterproof and dustproof in sound absorption material and easy to replace, as shown in figure 1.
As shown in fig. 1, a throttle pressure reduction-impedance composite exhaust and evacuation muffler comprises an air inlet part, a sound elimination part and an air outlet part. The air inlet part comprises a conical expansion pipe 3, the bottom of the conical expansion pipe 3 is provided with a connecting flange 2, the air outlet part comprises a conical contraction pipe 5, and the top of the conical contraction pipe 5 is provided with a square rain shield 15. In the embodiment, the diameter of an air outlet at the top of the conical expansion pipe 3 is 1.5 times that of an air inlet at the bottom, and the top of the conical expansion pipe is connected with a first throttling and pressure reducing pipe 7; the diameter of the air inlet at the bottom of the conical shrinkage pipe 5 is 1.5 times of that of the air outlet at the top, the air outlet at the top of the conical shrinkage pipe is externally connected with a square rain shield 15, and the thickness of the plate is 2 mm.
As shown in fig. 2, the sound-absorbing part includes a housing 1, a throttling pressure-reducing sound-absorbing cavity 20, a resistant resonance sound-absorbing cavity 16 and a resistive sound-absorbing cavity 14 are sequentially arranged in the housing 1 along the gas flow direction, a drain hole 18 is formed at the bottom of the housing 1, and a small amount of water enters the housing 1 and is discharged through the drain hole 18, so as to prevent the resistive sound-absorbing material from being soaked in water and losing efficacy. Two sides of the middle part of the shell 1 are provided with U-shaped supports 4 for installation and fixation.
The inner side wall of the shell 1 is provided with a perforated protective pipe 9, the perforated protective pipe 9 and the shell 1 are coaxial, and the bottom of the perforated protective pipe 9 is welded with the bottom of the shell 1. A sound absorption layer 10 with a thickness of 50mm is arranged between the shell 1 and the perforated facing pipe 9, the used material is centrifugal glass wool, and the density is 36kg/m3The glass wool is externally coated by glass fiber cloth and polyethylene films, the glass wool is designed between the perforated protective pipe 9 and the shell 1, and the sound absorption performance is further enhanced.
As shown in fig. 3, the throttling pressure-reducing muffling cavity 20 includes a first throttling pressure-reducing pipe 7 and a second throttling pressure-reducing pipe 8, which are disposed at the air inlet, the second throttling pressure-reducing pipe 8 is sleeved outside the first throttling pressure-reducing pipe 7, the first throttling pressure-reducing pipe 7 and the second throttling pressure-reducing pipe 8 share the same axis with the casing 1, the distance between the two pipe walls is 60mm, and the bottom ends of the two pipes are welded to the bottom of the casing 1. The tops of the first throttling pressure reducing pipe 7 and the second throttling pressure reducing pipe 8 are in an ellipsoidal shape, so that sound waves incident in different directions can be reflected, and exhaust noise is reduced.
The top ends of the first throttling pressure reducing pipe 7 and the second throttling pressure reducing pipe 8 are closed, the upper half part is provided with a hole, and the lower half part and the top end are not provided with holes. A hole with the diameter of 5mm is formed in the throttling depressurization pipe I7, and the perforation rate is 20%; the second throttling depressurization pipe 8 is provided with a hole with the diameter of 10mm, and the perforation rate is 30 percent. A porous baffle 6 is horizontally arranged in the first throttling depressurization pipe 7, the porous baffle 6 is a steel porous plate with the thickness of 1mm, the aperture is 10mm, and the perforation rate is 20%.
The shell 1, the conical expansion pipe 3 and the conical contraction pipe 5 of the silencer are all made of galvanized steel plates with the thickness of 5 mm. The conical expansion pipe 3 can expand and reduce the speed of gas before the gas enters the silencer, and impact of high-speed airflow on the throttling pressure reduction pipe is reduced.
The high-speed airflow passes through the porous baffle 6, the throttling pressure reducing pipe I7 and the throttling pressure reducing pipe II 8 in sequence and undergoes twice throttling and speed reduction, so that the airflow speed and the gas impact noise are reduced primarily.
As shown in fig. 5, an air inlet micro perforated pipe 11 is arranged at an air inlet end in the resistant resonance sound absorption cavity 16, and a plurality of air outlet micro perforated pipes 12 are arranged at an air outlet end; inlet microperforated tube 11 and outlet microperforated tube 12 are secured to resonator chamber partition 17. The aperture of the inlet micro-perforated pipe 11 and the aperture of the outlet micro-perforated pipe 12 are both 1mm, and the perforation rate is both 5%. The inner wall of the resistant resonance sound absorption chamber 16 is welded to the perforated facing tube 9. The flow velocity of the air flow after the three-stage speed reduction and expansion is about 5m/s basically, so the resistant resonance sound absorption cavity 16 mainly has the function of reducing the noise generated during the pressure reduction and expansion of the air flow, particularly the low-frequency noise. When the sound wave enters the air inlet micro-perforated pipe 11 of the resistant resonance sound absorption cavity, because the impedance of the joint of the air inlet micro-perforated pipe 11 is low near the resonance frequency, the impedance of the sound wave is mismatched at the position, most sound energy is reflected back along the sound source direction, a part of sound energy is converted into heat energy to be absorbed due to the friction damping effect of the micropores, and only a small part of sound energy continues to propagate.
As shown in fig. 4, a cylindrical sound absorbing material is provided in the resistive sound absorbing chamber 14. The cylindrical sound absorption material comprises a cylindrical aluminum alloy thin-wall pipe 21 and centrifugal glass wool 22 arranged in the cylindrical aluminum alloy thin-wall pipe 21, the wall thickness of the cylindrical aluminum alloy thin-wall pipe 21 is 1mm, and the density of the centrifugal glass wool is 36kg/m3The centrifugal glass wool is wrapped by glass fiber cloth and polyethylene film, so that broken glass wool can be prevented from falling into the channel in the pipe and being damped, and the service life of the pipe is shortened. The bottom of the cylindrical aluminum alloy thin-wall pipe is welded on the perforated protective surface pipe 9 through a cross support frame 13, and a top support frame 19 is connected on the perforated protective surface pipe 9 through a bolt, so that the invalid centrifugal glass wool can be conveniently taken out for replacement.
The silencer structure of the invention adopts a multi-stage throttling pressure-reducing silencer, and is assisted with resonance silencing and resistance sound absorption, so that the speed and the pressure of the air flowing through the silencer are greatly reduced, the noise level is obviously reduced, the fluidity of the air flow tends to be stable, and the noise reduction can reach more than 30dB (A).
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A throttling pressure reduction-impedance composite exhaust emptying silencer comprises an air inlet part, a silencing part and an air outlet part, and is characterized in that the silencing part comprises a shell, a throttling pressure reduction silencing cavity, a resistant resonance sound absorbing cavity and a resistant sound absorbing cavity are sequentially arranged in the shell along the air flowing direction, and a drain hole is formed in the bottom of the shell;
the throttling pressure reducing and silencing cavity comprises a throttling pressure reducing pipe I and a throttling pressure reducing pipe II which are arranged at an air inlet, the throttling pressure reducing pipe II is sleeved outside the throttling pressure reducing pipe I, the top ends of the throttling pressure reducing pipe I and the throttling pressure reducing pipe II are closed, the upper half part of the throttling pressure reducing pipe I is provided with a hole, and a porous baffle is horizontally arranged inside the throttling pressure reducing pipe I;
an air inlet micro perforated pipe is arranged at the air inlet end in the resistant resonance sound absorption cavity, and a plurality of air outlet micro perforated pipes are arranged at the air outlet end;
and a cylindrical sound absorption material is arranged in the resistive sound absorption cavity.
2. The exhaust muffler of claim 1, wherein the inlet portion comprises a conical expansion pipe connected to the first throttle pressure reducing pipe, a connecting flange is disposed at the bottom of the conical expansion pipe, the outlet portion comprises a conical contraction pipe connected to the housing, and a rain shield is disposed at the top of the conical contraction pipe.
3. The exhaust muffler of claim 2, wherein the diameter of the top outlet of the conical expanding tube is 1.5 times the diameter of the bottom inlet, and the diameter of the bottom inlet of the conical contracting tube is 1.5 times the diameter of the top outlet.
4. The muffler of claim 1, wherein a perforated pipe is disposed on the inner side wall of the housing, and a sound absorbing layer is disposed between the housing and the perforated pipe.
5. The throttle pressure reduction-impedance composite exhaust and exhaust muffler according to claim 4, wherein the cylindrical sound absorption material comprises a cylindrical aluminum alloy thin-wall pipe and centrifugal glass wool arranged inside the cylindrical aluminum alloy thin-wall pipe, the wall thickness of the cylindrical aluminum alloy thin-wall pipe is 1mm, and the density of the centrifugal glass wool is 36kg/m3The centrifugal glass wool is externally coated with glass fiber cloth and polyethylene film.
6. The muffler of claim 5, wherein the bottom of the cylindrical aluminum alloy thin-walled tube is welded to the perforated facing tube by a cross support bracket, and the top support bracket is connected to the perforated facing tube by a bolt.
7. The exhaust and exhaust muffler of claim 1, wherein the first throttle pressure reducing pipe is provided with a hole with a diameter of 5mm, and the perforation rate is 20%; and the second throttling depressurization pipe is provided with holes with the diameter of 10mm, and the perforation rate is 30%.
8. The exhaust muffler of claim 1, wherein the perforated baffle is a perforated steel plate with a thickness of 1mm, the diameter of the perforated steel plate is 10mm, and the perforation rate is 20%.
9. The exhaust muffler of claim 1, wherein the inlet microperforated pipe and the outlet microperforated pipe each have an opening diameter of 1mm and a perforation rate of 5%.
10. The exhaust and exhaust muffler of claim 1, wherein the first throttle pressure reducing pipe and the second throttle pressure reducing pipe are coaxial with the housing, the distance between the two pipe walls is 60mm, and the bottom ends of the two pipes are welded to the bottom of the housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911306454.0A CN111043437A (en) | 2019-12-18 | 2019-12-18 | Throttling pressure reduction-impedance composite exhaust emptying silencer |
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| CN201911306454.0A CN111043437A (en) | 2019-12-18 | 2019-12-18 | Throttling pressure reduction-impedance composite exhaust emptying silencer |
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| CN111043437A true CN111043437A (en) | 2020-04-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915441A (en) * | 2021-10-14 | 2022-01-11 | 哈尔滨理工大学 | A ventilation duct muffler |
| CN113931719A (en) * | 2021-08-20 | 2022-01-14 | 潘泉方 | An exhaust muffler for a high-power diesel engine or an internal combustion engine |
| CN114688379A (en) * | 2020-12-30 | 2022-07-01 | 无锡世一电力环保有限公司 | A duplex muffler |
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| CN209685834U (en) * | 2019-03-04 | 2019-11-26 | 尹振亭 | A kind of blast furnace pressure-equalizing and discharging purification filtering silencer |
| CN211450029U (en) * | 2019-12-18 | 2020-09-08 | 青岛理工大学 | Throttling pressure reduction-impedance composite exhaust emptying silencer |
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| WO2002050407A1 (en) * | 2000-12-20 | 2002-06-27 | Quiet Storm, Llc | Method and apparatus for improved noise attenuation in a dissipative internal combustion engine exhaust muffler |
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| CN204791946U (en) * | 2015-07-21 | 2015-11-18 | 青岛理工大学 | Sound absorption and insulation device for moving sound source and frequency division sound absorption and insulation cover comprising same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688379A (en) * | 2020-12-30 | 2022-07-01 | 无锡世一电力环保有限公司 | A duplex muffler |
| CN113931719A (en) * | 2021-08-20 | 2022-01-14 | 潘泉方 | An exhaust muffler for a high-power diesel engine or an internal combustion engine |
| CN113915441A (en) * | 2021-10-14 | 2022-01-11 | 哈尔滨理工大学 | A ventilation duct muffler |
| CN113915441B (en) * | 2021-10-14 | 2022-08-12 | 哈尔滨理工大学 | A ventilation duct muffler |
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