CN104165083B - Noise reduction device of exhaust pipe - Google Patents
Noise reduction device of exhaust pipe Download PDFInfo
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- CN104165083B CN104165083B CN201410099821.5A CN201410099821A CN104165083B CN 104165083 B CN104165083 B CN 104165083B CN 201410099821 A CN201410099821 A CN 201410099821A CN 104165083 B CN104165083 B CN 104165083B
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- air
- noise reduction
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- pore
- air inlet
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- 230000009467 reduction Effects 0.000 title abstract description 44
- 230000030279 gene silencing Effects 0.000 claims description 34
- 239000011148 porous material Substances 0.000 claims description 33
- 229920000742 Cotton Polymers 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000005192 partition Methods 0.000 abstract 4
- 238000009423 ventilation Methods 0.000 abstract 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000012216 screening Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 241000973497 Siphonognathus argyrophanes Species 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses a noise reduction device of an exhaust pipe. The noise reduction device of the exhaust pipe comprises a barrel. A noise reduction cavity is formed in the barrel. The two ends of the barrel are provided with an air inlet and an air outlet respectively. Two partition plates and two baffles are installed in the noise reduction cavity sequentially in the direction of the air outlet. A connection pipe penetrates through the upper portions of the two partition plates and penetrates through the lower portions of the two baffles. The lower portion of each partition plate is provided with a plurality of through holes. A plurality of air holes are formed in the upper portion of each baffle. A ventilation pipe is connected between the air outlet and the air inlet and penetrates through the partition plates and the baffles. A pneumatic control valve is arranged at the connecting position between the ventilation pipe and the air inlet. When the flow of air flowing in from the air inlet is small, noise generated by air flow correspondingly is low, the pneumatic control valve is closed directly, the air flow is directly exhausted from the ventilation pipe via the air outlet, the possibility of residual air flow in the noise reduction cavity is decreased, and the service life of the noise reduction device can be prolonged.
Description
Technical field
The present invention relates to a kind of deafener, specifically refer to the silencing means of exhaustor.
Background technology
In urban environment, traffic noise is to radiate the polluter the strongest, impact is the widest.In motor vehicles noise, aerofluxuss are made an uproar
Sound is one of main noise sound source, and its reduction is mainly passed through to install exhaust silencer, necessarily to starting after installing acoustic filter
Machine produces a very large impact；The power loss of general acoustic filter 3% ~ 8%, allows larger power loss when sound deadening capacity is larger；
The acoustic filter of coupling low-powered engine more requires relatively low power loss.
The car owning amount of China is increasing, and the requirement to automobile for the people is only no longer the vehicles, more will
Ask the energy-conserving and environment-protective of car, attractive in appearance and comfortable.The traffic noise of motor vehicles is the main source of urban road noise, for automobile
Legislations for noise will be constantly strict.But in general deafener production and processing, that mainly applies on the market at present is resistive
Acoustic filter and reactive muffler, can only individually be processed to the noise of high frequency or medium and low frequency, the scope of application is not wide, and
For dissipative muffler: in high temperature, vapor and the gas having corrosiveness to sound-absorbing material, the use longevity of acoustic filter
Life is short, poor to low-frequency noise effect；Maximum the drawbacks of is exactly that acoustic filter power loss is excessive.
Content of the invention
It is an object of the invention to provide the silencing means of exhaustor, reduce the infringement to deafener for the air-flow, reduce and eliminate the noise
The loss power of device.
The purpose of the present invention is achieved through the following technical solutions:
The silencing means of exhaustor, including cylinder, are provided with silencing cavity, the two ends of cylinder are respectively provided with described cylinder
There are air inlet and gas outlet, be sequentially installed with two demarcation strips and baffle plate, connecting tube in described noise reduction intracavity along gas outlet direction
Run through the top of two demarcation strips, connecting tube runs through the bottom of two baffle plates, the bottom of demarcation strip is provided with multiple through holes, baffle plate
Top be provided with multiple pores, be also associated with breather between described gas outlet and air inlet, described breather runs through point
Dividing plate and baffle plate, are provided with pneumatic control valve in breather and air inlet junction.Traditional acoustic filter is when using, no matter gas
Uninterrupted, air-flow all can pass through to carry out noise reduction process in deafener internal structure, and is blended in miscellaneous on a small quantity in air-flow
Matter or corrosive deposit can rest on inside deafener for a long time, can its internal structure be caused necessarily damage, reduce deafener
Power；When the present invention uses, air-flow is passed in breather by air inlet, is arranged on the pneumatic control valve energy at air inlet
Size according to throughput controlling the flow direction of air-flow, when throughput exceedes certain limit, pneumatic control valve open so that
Air-flow enters directly in the space that first demarcation strip is constituted with noise reduction cavity wall by air inlet, and most air-flow is by connecting tube
Enter into second space between demarcation strip and baffle plate, the air-flow of remainder is by the through hole on two demarcation strips step by step to it
Carry out noise reduction process, the air-flow being passed through by air inlet enters in larger space environment suddenly in less spatial environmentss, only
The sound wave having the minority frequency near through hole natural frequency could reach second sky between demarcation strip and baffle plate by through hole
Between, and the sound wave of other minority frequency then can not pass through through hole, the space that can only collectively form with silencing cavity end in demarcation strip
Constantly reflect, until air-flow momentum disappears, that is, complete the noise reduction operation of first stage；
After the noise reduction operation of first stage, the overall momentum of air-flow has been consumed major part, continues to start second-order
The noise reduction operation of section, and the noise reduction mode of first stage is similar with the noise reduction mode of second stage, the air-flow significantly being weakened
In most of connecting tube entering between two baffle plates, finally discharged by gas outlet, remainder is near pore natural frequency
The sound wave of minority frequency gas outlet could be reached by pore, and the sound wave of other minority frequency then can not pass through pore,
The space that can be collectively formed with silencing cavity other end end in second baffle plate is constantly reflected, until air-flow momentum disappears, that is, complete
Become the noise reduction operation of second stage, be finally reached good noise reduction purpose, and move quickly through the air-flow residue very small amount of silencing cavity
Part remain in noise reduction intracavity, reduce residual fraction air-flow to the impact within deafener or corrosion, reduce noise elimination
The loss power of device；
And when the throughput being flowed into by air inlet is less, the corresponding noise producing of air-flow is less, pneumatic control valve is direct
Close, air-flow directly has breather to discharge through gas outlet, reduces the probability of silencing cavity interior air-flow residual, is conducive to raising to disappear
The service life of sound device.
Away from the pore on the baffle plate of gas outlet with diameter greater than near gas outlet baffle plate on pore diameter.Through hole
Play the effect of the noise sound wave of screening through hole natural frequency in main noise reduction operation in the first stage, and pore is then second
The effect of the noise sound wave of screening pore natural frequency is played in stage noise reduction operation, after first stage noise reduction operation terminates,
When the air-flow entering into second stage noise reduction operation is through air passing hole, the frequency spectrum of noise will shift to high frequency or hyperfrequency, makes frequency spectrum
In audible sound composition substantially reduce, thus reducing to the interference of people and injury；The aperture of through hole is more than the aperture of pore, both
Itself intrinsic frequency is different, can successively the sound wave of different frequency be eliminated it is ensured that after the airflow passes present invention, quiet
Harmlessly discharge.
The connecting tube mouth of pipe between described demarcation strip is just to pore position.The big portion of air-flow through first stage noise reduction operation
Divide and be passed in the spatial joint clearance between the second demarcation strip and first baffle plate by the connecting tube mouth of pipe, the connecting tube mouth of pipe is just to pore
Position so that the air-flow flowing fast through connecting tube is directly screened by pore, and remaining air-flow is connected by baffle plate bottom again
The connecting tube connecing is discharged, and increases the efficiency that pore screens sound wave.
The diameter of described pore is successively decreased along gas outlet direction.Second stage noise reduction operation is to noise sound wave in air-flow
Final process, to air inlet to second baffle plate in gas outlet direction on aperture be less than first baffle plate aperture so that
Air-flow is graded process again, through the screening twice of second stage noise reduction operation, can thoroughly ensure the noise in air-flow
It is completely eliminated.
Also include being arranged at the silencing cotton of cylinder inboard wall.When the noise in air-flow passes through first stage and second stage completely
After noise reduction operation, the sound wave of low and medium frequency is thoroughly processed, and remaining high frequency sound wave is absorbed by the numerous spaces on silencing cotton, warp
Constantly transmitting with absorption after it is ensured that in air-flow noise be eliminated completely.
The present invention compared with prior art, has such advantages as and beneficial effect:
1st, the silencing means of exhaustor of the present invention, when the throughput being flowed into by air inlet is less, the corresponding generation of air-flow
Noise is less, and pneumatic control valve directly cuts out, and air-flow directly has breather to discharge through gas outlet, reduces silencing cavity interior air-flow residual
The probability stayed, is conducive to improving the service life of deafener；
2nd, the silencing means of exhaustor of the present invention, second stage noise reduction operation is the final place to noise sound wave in air-flow
Reason, to air inlet to second baffle plate in gas outlet direction on aperture be less than first baffle plate aperture so that air-flow is another
Secondary be graded process, through the screening twice of second stage noise reduction operation, can thoroughly ensure that the noise in air-flow is disappeared completely
Remove.
3rd, the silencing means of exhaustor of the present invention, when the noise in air-flow passes through first stage and second stage noise reduction completely
After operation, the sound wave of low and medium frequency is thoroughly processed, and remaining high frequency sound wave is absorbed by the numerous spaces on silencing cotton, through constantly
Ground transmitting with absorption after it is ensured that in air-flow noise be eliminated completely.
Brief description
Accompanying drawing described herein is used for providing the embodiment of the present invention is further understood, and constitutes of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is present configuration schematic diagram；
Labelling and corresponding parts title in accompanying drawing:
1- cylinder, 2- silencing cavity, 3- air inlet, 4- gas outlet, 5- demarcation strip, 6- baffle plate, 7- connecting tube, 8- through hole, 9-
Pore, 10- breather, 11- pneumatic control valve, 12- silencing cotton.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and the exemplary embodiment of the present invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
As shown in figure 1, the silencing means of exhaustor of the present invention, including cylinder 1, in described cylinder 1, it is provided with silencing cavity
2, the two ends of cylinder 1 are respectively arranged with air inlet 3 and gas outlet 4, install successively along gas outlet 4 direction in described silencing cavity 2
There are two demarcation strips 5 and baffle plate 6, connecting tube 7 runs through the top of two demarcation strips 5, connecting tube 7 runs through the bottom of two baffle plates 6,
The bottom of demarcation strip 5 is provided with multiple through holes 8, and the top of baffle plate 6 is provided with multiple pores 9, in described gas outlet 4 and air inlet
It is also associated with breather 10, described breather 10 runs through demarcation strip 5 and baffle plate 6, is connected with air inlet 3 in breather 10 between 3
Place is provided with pneumatic control valve 11；The aperture of described through hole 8 is more than the diameter of pore 9；Connecting tube 7 between described demarcation strip 5
The mouth of pipe just to pore 9 position, away from the pore 9 on the baffle plate 6 of gas outlet 4 with diameter greater than on the baffle plate 6 of gas outlet 4
The diameter of pore 9；Also include being arranged at the silencing cotton 12 of cylinder 1 inwall.
When the present invention uses, air-flow is passed in breather 10 by air inlet 3, is arranged on the pneumatic control at air inlet 3
Valve 11 processed can control the flow direction of air-flow, when throughput exceedes certain limit, pneumatic control valve 11 according to the size of throughput
Door is opened so that air-flow enters directly in the space that first demarcation strip 5 is constituted with silencing cavity 2 wall by air inlet 3, most of
Air-flow space between second demarcation strip 5 and baffle plate 6 is entered into by connecting tube 7, the air-flow of remainder is separated by two
Through hole 8 on plate 5 carries out noise reduction process to it step by step, and the air-flow being passed through by air inlet 3 enters suddenly in less spatial environmentss
Enter in larger space environment, the sound wave of the only minority frequency near through hole 8 natural frequency could pass through through hole 8 and reach second
Space between individual demarcation strip 5 and baffle plate 6, and the sound wave of other minority frequency then can not pass through through hole 8, can only be in demarcation strip 5
The space being collectively formed with silencing cavity 2 end is constantly reflected, until air-flow momentum disappears, that is, completes the noise reduction work of first stage
Sequence；
After the noise reduction operation of first stage, the overall momentum of air-flow has been consumed major part, continues to start second-order
The noise reduction operation of section, and the noise reduction mode of first stage is similar with the noise reduction mode of second stage, the air-flow significantly being weakened
In most of connecting tube 7 entering between two baffle plates 6, finally discharged by gas outlet 4, remainder is in pore 9 natural frequency
The sound wave of neighbouring minority frequency could pass through pore 9 and reach gas outlet 4, and the sound wave of other minority frequency then can not pass through gas
Hole 9, the space that can only be collectively formed with silencing cavity 2 other end end in second baffle plate 6 is constantly reflected, until air-flow momentum disappears
Lose, that is, complete the noise reduction operation of second stage, be finally reached good noise reduction purpose, and the air-flow moving quickly through silencing cavity 2 remains
Remaining minimal amount of part remains in silencing cavity 2, reduces residual fraction air-flow to the impact within deafener or corrosion, drops
The low loss power of acoustic filter；And when the throughput being flowed into by air inlet 3 is less, the corresponding noise producing of air-flow is less,
Pneumatic control valve 11 directly cuts out, and air-flow directly has breather 10 to discharge through gas outlet 4.
The effect of the noise sound wave of screening through hole 8 natural frequency is played in the main noise reduction operation in the first stage of through hole 8, and
Pore 9 is then the effect of the noise sound wave playing screening pore 9 natural frequency in second stage noise reduction operation, works as the first stage
After noise reduction operation terminates, when the air-flow that enters into second stage noise reduction operation is through air passing hole 9, the frequency spectrum of noise will shift to high frequency
Or hyperfrequency, so that the audible sound composition in frequency spectrum is substantially reduced, thus reducing the interference to people and injury；The aperture of through hole 8 is big
In the aperture of pore 9, both itself intrinsic frequencies are different, can successively the sound wave of different frequency be eliminated it is ensured that gas
After stream flows through the present invention, peace and quiet are harmlessly discharged；Led to by connecting tube 7 mouth of pipe through the air-flow major part of first stage noise reduction operation
Enter in the spatial joint clearance between the second demarcation strip 5 and first baffle plate 6, the position just to pore 9 for connecting tube 7 mouth of pipe so that
The air-flow flowing fast through connecting tube 7 is directly screened by pore 9, and the connection that remaining air-flow is connected by baffle plate 6 bottom again
Pipe 7 is discharged, and increases the efficiency that pore 9 screens sound wave；Second stage noise reduction operation is the final place to noise sound wave in air-flow
Reason, to air inlet 3 to second baffle plate 6 in gas outlet 4 direction on aperture be less than the aperture of first baffle plate 6 so that air-flow
It is graded process again, through the screening twice of second stage noise reduction operation, can thoroughly ensure that the noise in air-flow is complete
Totally disappeared and remove.
When the noise in air-flow is completely after first stage and second stage noise reduction operation, the sound wave of low and medium frequency is thorough
Bottom is managed, and remaining high frequency sound wave absorbed by the numerous spaces on silencing cotton 12, through constantly transmitting with absorb after it is ensured that gas
In stream, noise is eliminated completely.
Above-described specific embodiment, has been carried out to the purpose of the present invention, technical scheme and beneficial effect further
Describe in detail, be should be understood that the specific embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc., all should comprise
Within protection scope of the present invention.
Claims (3)
1. the silencing means of exhaustor, including cylinder (1), are provided with silencing cavity (2) in described cylinder (1), and the two of cylinder (1)
End be respectively arranged with air inlet (3) and gas outlet (4) it is characterised in that: along gas outlet (4) direction in described silencing cavity (2)
It is sequentially installed with two demarcation strips (5) and baffle plate (6), connecting tube (7) runs through the top of two demarcation strips (5), connecting tube (7) is passed through
Wear the bottom of two baffle plates (6), the bottom of demarcation strip (5) is provided with multiple through holes (8), the top of baffle plate (6) is provided with multiple
Pore (9), is also associated with breather (10) between described gas outlet (4) and air inlet (3), and described breather (10) is run through point
Dividing plate (5) and baffle plate (6), are provided with pneumatic control valve (11) in breather (10) and air inlet (3) junction；Described through hole
(8) aperture is more than the diameter of pore (9), and connecting tube (7) mouth of pipe between described demarcation strip (5) is just to pore (9) position.
2. exhaustor according to claim 1 silencing means it is characterised in that: on the baffle plate (6) away from gas outlet (4)
Pore (9) with diameter greater than near gas outlet (4) baffle plate (6) on pore (9) diameter.
3. exhaustor according to claim 1 and 2 silencing means it is characterised in that: also include being arranged in cylinder (1)
The silencing cotton (12) of wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099821.5A CN104165083B (en) | 2014-03-18 | 2014-03-18 | Noise reduction device of exhaust pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099821.5A CN104165083B (en) | 2014-03-18 | 2014-03-18 | Noise reduction device of exhaust pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104165083A CN104165083A (en) | 2014-11-26 |
| CN104165083B true CN104165083B (en) | 2017-01-18 |
Family
ID=51909046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410099821.5A Active CN104165083B (en) | 2014-03-18 | 2014-03-18 | Noise reduction device of exhaust pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN104165083B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847449A (en) * | 2015-04-13 | 2015-08-19 | 成都陵川特种工业有限责任公司 | Noise weakening processing method for exhaust gas emission pipe |
| CN104863681A (en) * | 2015-04-13 | 2015-08-26 | 成都陵川特种工业有限责任公司 | Exhaust pipe silencing method |
| CN108231051A (en) * | 2016-12-15 | 2018-06-29 | 詹志光 | A kind of titanium alloy hush tube |
| CN110552756A (en) * | 2018-05-30 | 2019-12-10 | 上海天纳克排气系统有限公司 | Silencing bag |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5984045A (en) * | 1997-02-14 | 1999-11-16 | Nissan Motor Co., Ltd. | Engine exhaust noise suppressor |
| CN101372909A (en) * | 2007-08-21 | 2009-02-25 | 比亚迪股份有限公司 | Silencer for automobile |
| CN203189093U (en) * | 2013-03-27 | 2013-09-11 | 杨悟英 | Silencer |
| CN203452880U (en) * | 2013-07-25 | 2014-02-26 | 成都陵川特种工业有限责任公司 | Automobile noise reduction drum |
| CN203742737U (en) * | 2014-03-18 | 2014-07-30 | 成都陵川常友汽车部件制造有限公司 | Silencing structure of exhaust pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100957147B1 (en) * | 2007-12-07 | 2010-05-11 | 현대자동차주식회사 | Muffler of vehicle and exhaust apparatus using the same |
-
2014
- 2014-03-18 CN CN201410099821.5A patent/CN104165083B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5984045A (en) * | 1997-02-14 | 1999-11-16 | Nissan Motor Co., Ltd. | Engine exhaust noise suppressor |
| CN101372909A (en) * | 2007-08-21 | 2009-02-25 | 比亚迪股份有限公司 | Silencer for automobile |
| CN203189093U (en) * | 2013-03-27 | 2013-09-11 | 杨悟英 | Silencer |
| CN203452880U (en) * | 2013-07-25 | 2014-02-26 | 成都陵川特种工业有限责任公司 | Automobile noise reduction drum |
| CN203742737U (en) * | 2014-03-18 | 2014-07-30 | 成都陵川常友汽车部件制造有限公司 | Silencing structure of exhaust pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104165083A (en) | 2014-11-26 |
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