CN107631106A - Discharge duct and its sound reduction method - Google Patents
Discharge duct and its sound reduction method Download PDFInfo
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- CN107631106A CN107631106A CN201710735211.3A CN201710735211A CN107631106A CN 107631106 A CN107631106 A CN 107631106A CN 201710735211 A CN201710735211 A CN 201710735211A CN 107631106 A CN107631106 A CN 107631106A
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- 230000009467 reduction Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008030 elimination Effects 0.000 claims abstract description 17
- 238000003379 elimination reaction Methods 0.000 claims abstract description 17
- 230000010363 phase shift Effects 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
Discharge duct and its sound reduction method provided by the invention, it is related to noise control noise elimination technique field.The discharge duct includes main channel, and main channel is discharged for gas, and main channel is provided with branch line, and branch line connects with main channel.Branch line is provided with hush tube, and hush tube includes beeline channel and camber line passage, and the both ends of camber line passage connect with the both ends of beeline channel respectively.Gas enters branch line through main channel, then by the hush tube on branch line, hush tube is used to carry out noise elimination noise reduction to gas, in order to which the noise of the gas of discharge reaches defined noise emission standards.The exhaust pipe structure is simple, and manufacturing cost is relatively low, excellent noise reduction effect.Discharge duct sound reduction method provided by the invention, using two-way acoustic phase difference and sound wave principle of stacking, there is good noise elimination noise reduction effect.
Description
Technical field
The present invention relates to noise control noise elimination technique field, in particular to a kind of discharge duct and its sound reduction method.
Background technology
In blast pipe, with a large amount of discharges of gas, noisy, ear-piercing sound, the generation of these noises are frequently accompanied by
Many inconvenience and puzzlement are brought to the production and living of people.Traditional sound reduction method has resistance noise reduction and reactive muffling.
Resistance noise reduction is eliminated the noise using sound-absorbing material, and sound-absorbing material is fixed on gas channel inwall or by certain way
Line up in the duct, just constitute dissipative muffler.Dissipative muffler is eliminated the noise mainly for medium-high frequency, and for all-bottom sound
Ripple, effect are poor.
Reactive muffling is eliminated the noise by controlling the size of acoustic reactance, and it is the pipeline section that the abrupt change of cross-section is connect on pipeline
Or resonant cavity, using acoustic impedance mismatch, phenomena such as making the sound wave of some frequencies be reflected at the interface that acoustic impedance is mutated, so as to
Reach noise elimination purpose.Reactive muffler is for a certain audio frequency particular design, mainly for pulse sound source.
Because traditional sound reduction method use range is limited, some are only applicable to the sound source of specific acoustic wave frequency, it is impossible to compared with
The good noise reduction that meets removes the needs of making an uproar, it is therefore necessary to studies new sound reduction method, it is therefore an objective to plays complementary work to tradition noise elimination
With, meet all trades and professions to reduce noise the needs of.
In view of this, design and manufacture a kind of discharge duct, there is noise reduction to remove the function made an uproar, and manufacturing cost is low, can be with
Simple in construction suitable for the sound wave of different frequency scope, excellent noise reduction effect is to be badly in need of improving in current noise control noise elimination technique field
Technical problem.
The content of the invention
It is an object of the invention to provide a kind of discharge duct, the discharge duct has noise reduction except the characteristics of making an uproar, structure
Simply, manufacturing cost is relatively low, and use range is wide, available in various exhaust equipments.Made an uproar moreover, the discharge duct noise reduction removes
Frequency of sound wave scope it is wide, noise reduction can be carried out to the sound wave of low frequency, intermediate frequency, high frequency, acoustic energy attenuation, excellent noise reduction effect, have pole
Big application value.
The present invention also aims to provide a kind of discharge duct sound reduction method, by the way that the sound wave of gas is passed through into multichannel
Shunting, the sound wave before shunting is same-phase, and the sound wave for making again to converge after shunting has phase difference and opposite in phase, is utilized
Sound wave principle of stacking, due to phase difference, the wave amplitude of the sound wave after synthesis is the difference of original wave amplitude, with reach acoustic energy attenuation,
Noise reduction removes the effect of sound.This method will not bad student's secondary noise pollution, noise-reduction works well, and there is wide market to apply
Prospect.
The present invention, which improves its technical problem, to be realized using following technical scheme.
A kind of discharge duct provided by the invention, the discharge duct include main channel, and the main channel is arranged for gas
Put, the main channel is provided with branch line, and the branch line connects with the main channel.
The branch line is provided with hush tube, and the hush tube includes beeline channel and camber line passage, and the camber line leads to
Both ends of the both ends in road respectively with the beeline channel connect.
The gas enters the branch line through the main channel, then by the noise elimination on the branch line
Pipe, the hush tube are used to carry out noise elimination noise reduction to the gas, in order to which the noise of the gas of discharge reaches defined
Noise emission standards.
Further, the cross-sectional area of the beeline channel is equal with the cross-sectional area of the camber line passage, so that into
The capacity of the beeline channel is equal with the capacity for entering the camber line passage, is advantageous to the sound wave in the beeline channel
The decay of energy after converging with the sound wave in the camber line passage.
Further, the length of the beeline channel is represented with L, and the length of the camber line passage is represented with H, the camber line
The difference of the length of passage and the length of the beeline channel is the half for the wave length of sound that the gas produces noise.
I.e.：
H-L=λ/2,
Wherein, λ represents that the gas of discharge produces the wave length of sound of noise.
Further, the beeline channel is on the branch line, the axis of the beeline channel and the branch
The axis of pipeline overlaps.
Further, the beeline channel is integrally formed with the branch line.
Further, the camber line passage is welded or is integrally formed with the branch line.
Further, the branch line is provided with multiple hush tubes, and multiple hush tubes are arranged at intervals.
Further, the main channel is provided with multiple branch lines, is all provided with each branch line
Hush tube is stated, the energy of the sound wave for the different frequency scope that can decay.
Further, audio frequency device is installed, the audio frequency device is used for the sound wave for analyzing the gas on the branch line
Frequency.
A kind of discharge duct sound reduction method provided by the invention, applied to above-mentioned discharge duct, the discharge duct disappears
Method for acoustic uses audio frequency phase shift noise-cancelling theory；
The sound wave of the gas enters the import intersection of the beeline channel and the camber line passage from the main channel
When be same-phase, after the beeline channel and the camber line corridor diversion, the outlet for reaching the camber line passage crosses
During place, two-way sound wave is that tool is dephased, and the opposite in phase of the two-way sound wave after phase shift, and it is dry that sound wave superposition occurs
Relate to, the net amplitude of the sound wave is the difference of the wave amplitude of the two-way sound wave, and to reach the energy for the sound wave of decaying, noise elimination removes
The purpose made an uproar.
Discharge duct and its sound reduction method provided by the invention have the beneficial effect of the following aspects：
Discharge duct provided by the invention, by setting branch line on main channel, set and eliminate the noise on branch line
Pipe, by the hush tube behind main channel into branch line, hush tube has the function that noise reduction removes to gas and made an uproar the gas of discharge.
The exhaust pipe structure is simple, and manufacturing cost is relatively low, and use range is wide, available in various exhaust equipments.Moreover, the row
Feed channel noise reduction is wide except the frequency of sound wave scope made an uproar, and can carry out noise reduction, acoustic energy attenuation, noise reduction to the sound wave of low frequency, intermediate frequency, high frequency
Effect is good, has great application value.
Discharge duct sound reduction method provided by the invention, by the way that the sound wave of gas is shunted by multichannel, before shunting
Sound wave is same-phase, and the sound wave for making again to converge after shunting has phase difference and opposite in phase, using sound wave principle of stacking,
Because with phase difference, the wave amplitude of the sound wave after synthesis is the difference of original wave amplitude, to reach acoustic energy attenuation, noise reduction removes the work of sound
With.This method will not bad student's secondary noise pollution, noise-reduction works well, and has wide market application foreground.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the first structural representation for the discharge duct that the specific embodiment of the invention provides；
Fig. 2 is the structural representation of the hush tube for the discharge duct that the specific embodiment of the invention provides；
Fig. 3 is second of structural representation of the discharge duct that the specific embodiment of the invention provides；
Fig. 4 is the phase shift noise-cancelling theory schematic diagram for the discharge duct that the specific embodiment of the invention provides.
Icon：100- discharge ducts；110- main channels；120- branch lines；130- hush tubes；131- beeline channels；
133- camber line passages.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.The present invention implementation being generally described and illustrated herein in the accompanying drawings
The component of example can be configured to arrange and design with a variety of.
Therefore, below the detailed description of the embodiments of the invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
In the description of the invention, it is to be understood that the orientation or position relationship of the instruction such as term " on ", " under " are base
In orientation shown in the drawings or position relationship, or product of the present invention using when the orientation usually put or position relationship, or
Person is the orientation or position relationship that those skilled in the art usually understand, is for only for ease of the description present invention and simplifies description,
Rather than instruction or imply signified equipment or element must have specific orientation, with specific azimuth configuration and operation, because
This is not considered as limiting the invention.
" first ", " second " etc. of the present invention, is used only for being distinguish between in description, not special implication.
In the description of the invention, it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ",
" installation " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can be
It is joined directly together, can also be indirectly connected by intermediary.For the ordinary skill in the art, can be with concrete condition
Understand the concrete meaning of above-mentioned term in the present invention.
Fig. 1 is the first structural representation for the discharge duct 100 that the specific embodiment of the invention provides, and refer to Fig. 1.
A kind of discharge duct 100 that the present embodiment provides, discharge duct 100 include main channel 110, and main channel 110 is used for
Gas discharges, and main channel 110 is provided with branch line 120, and branch line 120 connects with main channel 110.
Branch line 120 is provided with hush tube 130, and hush tube 130 includes beeline channel 131 and camber line passage 133, camber line
Both ends of the both ends of passage 133 respectively with beeline channel 131 connect.
Direction in figure shown in arrow is the flow direction of gas.Gas enters branch line 120 through main channel 110, then passes through
Hush tube 130 on branch line 120, hush tube 130 is used to carry out noise elimination noise reduction to gas, in order to the gas of discharge
Noise reach defined noise emission standards.
Fig. 2 is the structural representation of the hush tube 130 for the discharge duct 100 that the specific embodiment of the invention provides, and be refer to
Fig. 2.
The cross-sectional area of beeline channel 131 is equal with the cross-sectional area of camber line passage 133, so that into beeline channel 131
Capacity with enter camber line passage 133 capacity it is equal, this ensures that frequency identical sound wave, two parts after phase shift
The synthetic quantity of acoustic energy is roughly equal, is advantageous to the energy after the sound wave in the sound wave in beeline channel 131 and camber line passage 133 converges
The decay of amount.
Preferably, the length of beeline channel 131 is represented with L, the length of camber line passage 133 is represented with H, camber line passage
The difference of 133 length and the length of beeline channel 131 is the half for the wave length of sound that gas produces noise.I.e.：
H-L=λ/2,
Wherein, λ represents that the gas of discharge produces the wave length of sound of noise.
Main channel 110 is provided with multiple branch lines 120, and hush tube 130 is equipped with each branch line 120, can
The energy of the sound wave for the different frequency scope that decays.
In the present embodiment, main channel 110 is provided with three branch lines 120, the bifurcated mouth position of three branch lines 120
In same place, certainly, it is not limited to that, bifurcated mouth can also be arranged on different places.On each branch line 120
Provided with a hush tube 130, the gas discharge progress flat on each branch line 120 is removed made an uproar respectively.Each branch line
The length of the beeline channel 131 of hush tube 130 on 120 is different, the length of camber line passage 133 is also different, can distinguish
The sound wave of different frequency scope is eliminated the noise, the energy for sound wave of decaying.
It should be noted that H and L difference can be gas wave length of sound half or 1/3rd, four points
First-class, according to the noise elimination of reality requirement, H and L difference can set difference.The quantity of branch line 120 is also not necessarily limited to three
It is individual, can be one, two, four or more.
Specifically, beeline channel 131 is on branch line 120, axis and the branch line 120 of beeline channel 131
Axis overlaps.
Beeline channel 131 is integrally formed with branch line 120, it is preferable that beeline channel 131 is branch line 120
A part, simplify the structure and production and processing step of whole discharge duct 100.Camber line passage 133 welds with branch line 120
Or be integrally formed, a bypass flow path of the camber line passage 133 as beeline channel 131, both ends and the straight line of camber line passage 133 lead to
The place that road 131 connects, one end is the import intersection of the sound wave of gas, and one end is the outlet intersection of sound wave.
Fig. 3 is second of structural representation of the discharge duct 100 that the specific embodiment of the invention provides, and refer to Fig. 3.
Branch line 120 is provided with multiple hush tubes 130, and multiple hush tubes 130 are arranged at intervals, and being formed has multistage eliminate the noise
The discharge duct 100 of function.Alternatively, two or three hush tubes 130 are set on same branch line 120, discharge
Gas often passes through a hush tube 130, and acoustic wave energy is decayed once, after multiple hush tubes 130, you can to the energy of sound wave
Repeatedly decayed, so as to which the decibel of gas noise be even lower, meet the noise elimination requirement under various harsh environments.
Alternatively, hush tube 130 can also be set on main channel 110, carry out pre- noise reduction processing, on branch line 120
Hush tube 130 carries out further decay to noise and weakened again.Audio frequency device, sound are installed on branch line 120 or main channel 110
Frequency device is used for the frequency of sound wave for analyzing gas noise.According to the frequency of the actual noise sound wave measured, the optimal noise elimination of reselection
Pipe 130 is matching, and erasure effect is more preferably.Certainly, the camber line passage 133 that can be adjusted using arc length is also possible,
And it is more convenient for being arranged to the difference of the length of camber line passage 133 and straight length to treat the two of noise reduction wave length of sound in practical application
/ mono-, to reach optimal erasure effect.
Fig. 4 is the phase shift noise-cancelling theory schematic diagram for the discharge duct 100 that the specific embodiment of the invention provides, and refer to Fig. 1
And Fig. 4.
A kind of discharge duct sound reduction method provided by the invention, applied to above-mentioned discharge duct 100, discharge duct is eliminated the noise
Method uses audio frequency phase shift noise-cancelling theory.Fig. 4 is indicated after beeline channel 131 and camber line passage 133 shunt, due to phase
Potential difference, sound wave synthesis schematic diagram when two-way sound wave converges.Curve A be camber line passage 133 acoustic waveform schematic diagram, curve B
For the acoustic waveform schematic diagram of beeline channel 131.The cycle of two oscillograms is the half of wave length of sound, i.e. T=λ/2.
It is same phase when the sound wave of gas is from main channel 110 into the import intersection of beeline channel 131 and camber line passage 133
Position, but after beeline channel 131 and camber line passage 133 shunt, just occur during the outlet intersection for reaching camber line passage 133
Phase difference, by the sound wave of camber line passage 133 lags behind the part sound wave by beeline channel 131.When camber line passage 133
Arc length and beeline channel 131 length difference be equal to the frequency sound waves half wavelength when, pass through camber line passage 133
The frequency sound waves and the phase difference that half of cycle just occurs by the sound wave of beeline channel 131, two parts sound wave after phase shift
Phase causes to weaken mutually just on the contrary, sound wave superposition interference occurs, the net amplitude of sound wave for two-way sound wave wave amplitude it
Difference, so as to the purpose for reaching the energy of decay sound wave, suppressing exhaust noise.
In summary, discharge duct 100 provided by the invention and its method have the beneficial effect of the following aspects：
Discharge duct 100 provided by the invention, by setting branch line 120 on main channel 110, in branch line
Hush tube 130 is set on 120, and hush tube 130 uses multi-channel flow passage, and the gas of discharge is by entering branch behind main channel 110
The hush tube 130 of pipeline 120, the hush tube 130 of multichannel have the function that noise reduction removes to gas and made an uproar.The knot of discharge duct 100
Structure is simple, and manufacturing cost is relatively low, and use range is wide, available in various exhaust equipments.Moreover, the discharge duct 100 disappears
Sound removes that the frequency of sound wave scope made an uproar is wide, can carry out noise reduction to the sound wave of low frequency, intermediate frequency, high frequency, acoustic energy attenuation, excellent noise reduction effect,
With great application value.
Discharge duct sound reduction method provided by the invention, by the way that the sound wave of gas is shunted by multichannel, before shunting
Sound wave is same-phase, and the sound wave for making again to converge after shunting has phase difference and opposite in phase, using sound wave principle of stacking,
Because with phase difference, the wave amplitude of the sound wave after synthesis is the difference of original wave amplitude, to reach acoustic energy attenuation, noise reduction removes the work of sound
With.This method will not bad student's secondary noise pollution, noise-reduction works well, and has wide market application foreground.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various changes, combination and change.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. discharge duct, it is characterised in that the discharge duct includes main channel, and the main channel is discharged for gas, The main channel is provided with branch line, and the branch line connects with the main channel；The branch line is provided with hush tube, and the hush tube includes beeline channel and camber line passage, the camber line passage Both ends of the both ends respectively with the beeline channel connect；The gas enters the branch line through the main channel, then by the hush tube on the branch line, institute State hush tube to be used to carry out noise elimination noise reduction to the gas, in order to which the noise of the gas of discharge reaches defined noise row Put standard.
- 2. discharge duct according to claim 1, it is characterised in that the cross-sectional area of the beeline channel and the camber line The cross-sectional area of passage is equal, so that the capacity into the beeline channel and the capacity phase into the camber line passage Deng being advantageous to the decay of the energy after the sound wave in the sound wave in the beeline channel and the camber line passage converges.
- 3. discharge duct according to claim 1, it is characterised in that the length of the beeline channel represents with L, the arc The length of line passage represents that the difference of the length of the camber line passage and the length of the beeline channel is produced for the gas with H The half of the wave length of sound of raw noise；I.e.：H-L=λ/2,Wherein, λ represents that the gas of discharge produces the wave length of sound of noise.
- 4. discharge duct according to claim 1, it is characterised in that the beeline channel is located on the branch line, The axis of the beeline channel overlaps with the axis of the branch line.
- 5. discharge duct according to claim 4, it is characterised in that the beeline channel and the branch line one into Type.
- 6. discharge duct according to claim 1, it is characterised in that the camber line passage and the branch line weld or It is integrally formed.
- 7. discharge duct according to claim 1, it is characterised in that the branch line is provided with multiple noise eliminations Pipe, multiple hush tubes are arranged at intervals.
- 8. discharge duct according to claim 1, it is characterised in that the main channel is provided with multiple branched pipes Road, the hush tube each is equipped with the branch line, the energy of the sound wave for the different frequency scope that can decay.
- 9. discharge duct according to claim 1, it is characterised in that audio frequency device is installed on the branch line, it is described Audio frequency device is used for the frequency of sound wave for analyzing the gas.
- 10. a kind of discharge duct sound reduction method, it is characterised in that applied to the blast pipe any one of claim 1 to 9 Road, the discharge duct sound reduction method use audio frequency phase shift noise-cancelling theory；It is when the sound wave of the gas is from the main channel into the import intersection of the beeline channel and the camber line passage Same-phase, after the beeline channel and the camber line corridor diversion, when reaching the outlet intersection of the camber line passage, Two-way sound wave is that tool is dephased, and the opposite in phase of the two-way sound wave after phase shift, and sound wave superposition interference occurs, described The net amplitude of sound wave is the difference of the wave amplitude of the two-way sound wave, and to reach the energy for the sound wave of decaying, noise elimination removes the mesh made an uproar 's.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710735211.3A CN107631106A (en) | 2017-08-24 | 2017-08-24 | Discharge duct and its sound reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710735211.3A CN107631106A (en) | 2017-08-24 | 2017-08-24 | Discharge duct and its sound reduction method |
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| CN107631106A true CN107631106A (en) | 2018-01-26 |
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| CN201710735211.3A Pending CN107631106A (en) | 2017-08-24 | 2017-08-24 | Discharge duct and its sound reduction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810409A (en) * | 2020-07-15 | 2020-10-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Pump body and compressor |
| CN116085572A (en) * | 2021-01-14 | 2023-05-09 | 哈尔滨工程大学 | Electroacoustic coupling-based pipeline low-frequency noise control device |
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| JPH06249387A (en) * | 1993-02-25 | 1994-09-06 | Hitachi Zosen Corp | Muffler |
| KR19980047233U (en) * | 1996-12-28 | 1998-09-25 | 양재신 | Variable Muffler Device of Car |
| JP2003106134A (en) * | 2001-09-28 | 2003-04-09 | Takasago Thermal Eng Co Ltd | Reactive type muffler |
| JP2005240635A (en) * | 2004-02-25 | 2005-09-08 | Calsonic Kansei Corp | Automobile resonator structure |
| CN203717463U (en) * | 2014-01-23 | 2014-07-16 | 浙江兴益风机电器有限公司 | Energy-efficient low-noise outer-rotor centrifugal fan |
| CN104454104A (en) * | 2014-11-21 | 2015-03-25 | 桂林新艺制冷设备有限责任公司 | Exhaust pipe for automobile |
| CN105587689A (en) * | 2014-10-22 | 2016-05-18 | 练逸夫 | Pipeline silencing device |
| CN106015818A (en) * | 2016-07-06 | 2016-10-12 | 南京常荣声学股份有限公司 | Noise elimination energy-saving pipeline |
| CN207122672U (en) * | 2017-08-24 | 2018-03-20 | 江西泰豪军工集团有限公司 | Discharge duct |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3568791A (en) * | 1968-02-27 | 1971-03-09 | Univ Sydney | Air ducting |
| JPH0527222U (en) * | 1991-09-20 | 1993-04-09 | 日産車体株式会社 | Engine exhaust system |
| JPH06249387A (en) * | 1993-02-25 | 1994-09-06 | Hitachi Zosen Corp | Muffler |
| KR19980047233U (en) * | 1996-12-28 | 1998-09-25 | 양재신 | Variable Muffler Device of Car |
| JP2003106134A (en) * | 2001-09-28 | 2003-04-09 | Takasago Thermal Eng Co Ltd | Reactive type muffler |
| JP2005240635A (en) * | 2004-02-25 | 2005-09-08 | Calsonic Kansei Corp | Automobile resonator structure |
| CN203717463U (en) * | 2014-01-23 | 2014-07-16 | 浙江兴益风机电器有限公司 | Energy-efficient low-noise outer-rotor centrifugal fan |
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| CN104454104A (en) * | 2014-11-21 | 2015-03-25 | 桂林新艺制冷设备有限责任公司 | Exhaust pipe for automobile |
| CN106015818A (en) * | 2016-07-06 | 2016-10-12 | 南京常荣声学股份有限公司 | Noise elimination energy-saving pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810409A (en) * | 2020-07-15 | 2020-10-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Pump body and compressor |
| CN116085572A (en) * | 2021-01-14 | 2023-05-09 | 哈尔滨工程大学 | Electroacoustic coupling-based pipeline low-frequency noise control device |
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Application publication date: 20180126 |