CN201610782U - Noise canceller for tail gas emission of diesel engine - Google Patents
Noise canceller for tail gas emission of diesel engine Download PDFInfo
- Publication number
- CN201610782U CN201610782U CN2009202866959U CN200920286695U CN201610782U CN 201610782 U CN201610782 U CN 201610782U CN 2009202866959 U CN2009202866959 U CN 2009202866959U CN 200920286695 U CN200920286695 U CN 200920286695U CN 201610782 U CN201610782 U CN 201610782U
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- cylindrical shell
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- diesel engine
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Abstract
The utility model discloses a noise canceller for tail gas emission of a diesel engine, which comprises a filtering element and a sound deadening element, wherein one end of the filtering element is hermetically connected with an exhaust discharge hole of the diesel engine, and the other end thereof is integrally connected with the sound deadening element. The filtering element can cancel high-frequency noise and intermediate-frequency noise while filtering carbon black particles in tail gas exhausted by the diesel engine, and also has lower cost; and after the filtered tail gas enters the sound deadening part, the sound deadening part conducts reflection on the noise under the condition that pressure loss of a pipeline is very small and divides energy of the transmitted noise together with sound wave in the air, thus playing a role in suppressing intermediate-frequency noise and low-frequency noise.
Description
Technical field
The utility model relates to that soot in the exhaust emissions of diesel engine captures and the technology of NR noise reduction, more particularly relates to a kind of noise elimination apparatus of exhaust emissions of diesel engine.
Background technique
In the exhaust emissions of diesel engine process, adopt different devices respectively for the removal of soot and the noise elimination of tail gas.At present, the method for removal soot mainly is to adopt honeycomb ceramic filter, wire gaze or ceramic fiber etc. as capturing the soot particulate media.The honeycomb ceramic filter filter has the high advantage of filter efficiency, but cost is higher, needs dependence on import; Ceramic fiber filter also is like this.The wire diameter of wire gauze filter is thinner, and coiling density is bigger, because circulation area is less, the phenomenon of scaling loss the wire gaze local superheating also appears and in trap particulate matter finite capacity easily.And mainly adopt reactive muffler for the noise elimination of diesel engine vent gas, two kinds of dissipative mufflers, reactive muffler is an appropriate combination of utilizing the pipeline or the so-called resonant cavity of different shape, size, impedance mismatching when causing sound wave in system, to propagate, make sound wave that reflection and interference take place in pipeline and resonant cavity, thereby it is reduced the acoustic energy of its output, mainly be applicable to the noise that reduces low frequency and Low Medium Frequency section, but relatively poor for the noise elimination effect of high frequency.Dissipative muffler is the purpose that reaches noise elimination for the sound absorption of sound-absorbing material such as glass wool, rock wool or felt or sound absorption structure by means of for example being contained on the tube wall, dissipative muffler has the effect of eliminating the noise preferably to high-frequency noises, but to low-frequency noise noise elimination weak effect, and sound-absorbing material is very easy is melted by high-temperature exhaust air, or is stopped up by the charcoal cigarette and acoustic attenuation performance is descended.Simultaneously, existing capture granule technology shows that the granule capturing rate is also relevant with pressure reduction, and the pressure reduction high capture rate that heals is higher, but this adverse effect that can cause exhaust back pressure to increase, for example, the exhaust back pressure increasing amount can rise to 0.02MPa from 0.005MPa; On the other hand, for reaching the effect of exhausting silencer, tail gas have the pressure loss of 0.01-0.02MPa, result to make the exhaust back pressure increasing amount double again by silencing apparatus or more than, like this can reduce the output of engine power, when serious even flame-out phenomenon occurs.
The model utility content
At the problem that can not be well under the very little situation of the pressure reduction that exists in the prior art noise of each frequency range in the diesel engine vent gas be reduced, the purpose of this utility model provides a kind of noise elimination apparatus of exhaust emissions of diesel engine, can well eliminate the noise of each frequency range.
For achieving the above object, the utility model adopts following technological scheme:
A kind of noise elimination apparatus of exhaust emissions of diesel engine comprises filter element and muffler part, and an end of filter element and the tail gas exhaust port of diesel engine are tightly connected, and the other end is connected with the muffler part one.
Described filter element comprises filtration barrel body and foamed ceramics, and the two ends of filtration barrel body offer vent, and foamed ceramics is located in the filtration barrel body and axial vertical with filtration barrel body, and the profile of foamed ceramics and filtration barrel body inboard shape are suitable.
Described muffler part comprises noise elimination cylindrical shell and flexible hush tube, and the two ends of noise elimination cylindrical shell offer vent, flexible hush tube be located in the noise elimination cylindrical shell and along the noise elimination cylindrical shell axially with the vent perforation at noise elimination cylindrical shell two ends.
Described muffler part comprises noise elimination cylindrical shell and flexible hush tube, the two ends of noise elimination cylindrical shell offer vent, flexible hush tube be located in the noise elimination cylindrical shell and along the noise elimination cylindrical shell axially with the vent perforation at noise elimination cylindrical shell two ends, the vent of noise elimination cylindrical shell is connected with the vent shape of filtration barrel body is suitable and airtight.
Described flexible hush tube comprises pipe and flexible membrane, and flexible membrane is located at the pipe inboard.
In technique scheme, the noise elimination apparatus of a kind of exhaust emissions of diesel engine of the present utility model comprises filter element and muffler part, and an end of filter element and the tail gas exhaust port of diesel engine are tightly connected, and the other end is connected with the muffler part one.Owing to adopted filter element, make the noise of the simultaneously all right cancellation high frequency of its soot particulate in filtering diesel engine vent gas, intermediate frequency, and cost be lower; After filtered tail gas enters muffler part, under the very little situation of duct pressure loss, noise is reflected, and cut apart the energy that is transmitted noise, play in the inhibition, the effect of low-frequency noise with airborne sound wave by muffler part.
Description of drawings
Fig. 1 is the structural representation of the noise elimination apparatus of a kind of exhaust emissions of diesel engine of the utility model.
Embodiment
Further specify the technical solution of the utility model below in conjunction with drawings and Examples.
See also the noise elimination apparatus 10 of a kind of exhaust emissions of diesel engine shown in Figure 1, comprise filter element 11 and muffler part 12, an end of filter element 11 and the tail gas exhaust port of diesel engine are tightly connected, and the other end is connected with muffler part 12 one.Filter element 11 comprises filtration barrel body 111 and foamed ceramics 112, the two ends of filtration barrel body 111 offer vent, foamed ceramics 112 is located in the filtration barrel body 111 and axial vertical with filtration barrel body 111, and the profile of foamed ceramics 112 and filtration barrel body 111 inboard shapes are suitable.Foamed ceramics not only has very high capture effect to soot particulate, thereby and the porous structure of foamed ceramics can realize the elimination of high frequency, mid-frequency noise is reached the effect of high sound deadening capacity, low pressure loss, and the cost of foamed ceramics is low, and is effective.Muffler part 12 comprises noise elimination cylindrical shell 121 and flexible hush tube 122, the two ends of noise elimination cylindrical shell 121 offer vent, flexible hush tube 122 is located in the noise elimination cylindrical shell 121 and axially offseting and perforation mutually with the vents at noise elimination cylindrical shell 121 two ends along noise elimination cylindrical shell 121, the vent of noise elimination cylindrical shell 121 is connected with the vent shape of filtration barrel body 111 is suitable and airtight, the internal diameter of flexible hush tube 122 is corresponding with the internal diameter of noise elimination cylindrical shell 122 two ends vents, seamless link by flexible hush tube 122, make the vent at noise elimination cylindrical shell 122 two ends connect, and in noise elimination cylindrical shell 121, form airtight back of the body chamber 123.Flexible hush tube 122 comprises aluminum pipe (not shown) and flexible membrane (not shown), and flexible membrane is located at the pipe inboard.Because during the acoustic reflection that flexible membrane produces has suppressed, the low frequency duct noise, when sound wave incides the flexible membrane surface, acoustic wave segment comes from the flexible membrane return reflection surface, cuts apart the energy that is transmitted ripple with airborne sound wave, plays the effect that weakens the incoming flow sound wave.The acoustic reflection that flexible membrane produces suppresses the medium and low frequency duct noise to be realized under cross-section area, the zero pressure drop condition deciding fully.Above-mentioned structure has also met " duct attenuation uniform section sound reflection principle ".
During use, the tail gas 20 that motor is discharged filters soot particulate through foamed ceramics 112, and enter flexible hush tube 122 behind the part of the cancellation simultaneously high-frequency noise, cause the vibration of flexible membrane because noise and flexible membrane interact, consequent reflected wave and ducted sound wave are interfered counteracting mutually.After the sound wave that has part to see through flexible membrane therebetween enters back of the body chamber 123, also the sound wave that produces with the flexible membrane vibration of back of the body chamber 123 1 sides interacts and eliminates, also have a small amount of sound wave of not eliminating in back of the body chamber 123, to get back in the pipeline once more at last, and repeating above-mentioned process, the medium and low frequency noise reduces significantly the most at last.In the process of whole noise elimination, because the air-flow of tail gas 20 does not see through flexible membrane all the time, so the pressure loss of pipeline is very little almost near zero.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating purpose of the present invention, and be not as limitation of the invention, as long as in essential scope of the present invention, all will drop in the scope of claim of the present invention the above embodiment's variation, modification.
Claims (5)
1. the noise elimination apparatus of an exhaust emissions of diesel engine, it is characterized in that: comprise filter element and muffler part, an end of filter element and the tail gas exhaust port of diesel engine are tightly connected, and the other end is connected with the muffler part one.
2. noise elimination apparatus as claimed in claim 1 is characterized in that:
Described filter element comprises filtration barrel body and foamed ceramics, and the two ends of filtration barrel body offer vent, and foamed ceramics is located in the filtration barrel body and axial vertical with filtration barrel body, and the profile of foamed ceramics and filtration barrel body inboard shape are suitable.
3. noise elimination apparatus as claimed in claim 1 is characterized in that:
Described muffler part comprises noise elimination cylindrical shell and flexible hush tube, and the two ends of noise elimination cylindrical shell offer vent, flexible hush tube be located in the noise elimination cylindrical shell and along the noise elimination cylindrical shell axially with the vent perforation at noise elimination cylindrical shell two ends.
4. noise elimination apparatus as claimed in claim 2 is characterized in that:
Described muffler part comprises noise elimination cylindrical shell and flexible hush tube, the two ends of noise elimination cylindrical shell offer vent, flexible hush tube be located in the noise elimination cylindrical shell and along the noise elimination cylindrical shell axially with the vent perforation at noise elimination cylindrical shell two ends, the vent of noise elimination cylindrical shell is connected with the vent shape of filtration barrel body is suitable and airtight.
5. as claim 3 or 4 described noise elimination apparatus, it is characterized in that:
Described flexible hush tube comprises pipe and flexible membrane, and flexible membrane is located at the pipe inboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202866959U CN201610782U (en) | 2009-12-29 | 2009-12-29 | Noise canceller for tail gas emission of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202866959U CN201610782U (en) | 2009-12-29 | 2009-12-29 | Noise canceller for tail gas emission of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201610782U true CN201610782U (en) | 2010-10-20 |
Family
ID=42961414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202866959U Expired - Fee Related CN201610782U (en) | 2009-12-29 | 2009-12-29 | Noise canceller for tail gas emission of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201610782U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106090521A (en) * | 2016-05-26 | 2016-11-09 | 哈尔滨工程大学 | Liquid-filling pipe low frequency drum-type active-passive composite sound-attenuating system |
| CN108836630A (en) * | 2018-06-28 | 2018-11-20 | 广东工业大学 | A kind of noise elimination structure noiseproof earplug |
| CN110861628A (en) * | 2019-11-29 | 2020-03-06 | 安徽江淮汽车集团股份有限公司 | Airflow silencer and unloading valve with same |
| CN114922714A (en) * | 2022-05-24 | 2022-08-19 | 深圳市市政工程总公司 | Silencer for reducing noise of construction vehicle engine |
-
2009
- 2009-12-29 CN CN2009202866959U patent/CN201610782U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106090521A (en) * | 2016-05-26 | 2016-11-09 | 哈尔滨工程大学 | Liquid-filling pipe low frequency drum-type active-passive composite sound-attenuating system |
| CN108836630A (en) * | 2018-06-28 | 2018-11-20 | 广东工业大学 | A kind of noise elimination structure noiseproof earplug |
| CN110861628A (en) * | 2019-11-29 | 2020-03-06 | 安徽江淮汽车集团股份有限公司 | Airflow silencer and unloading valve with same |
| CN114922714A (en) * | 2022-05-24 | 2022-08-19 | 深圳市市政工程总公司 | Silencer for reducing noise of construction vehicle engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101020 Termination date: 20101229 |