CN203742738U - Noise treatment device for exhaust pipe - Google Patents
Noise treatment device for exhaust pipe Download PDFInfo
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- CN203742738U CN203742738U CN201420121692.0U CN201420121692U CN203742738U CN 203742738 U CN203742738 U CN 203742738U CN 201420121692 U CN201420121692 U CN 201420121692U CN 203742738 U CN203742738 U CN 203742738U
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- air
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- air outlet
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Abstract
The utility model discloses a noise treatment device for an exhaust pipe. The noise treatment device comprises a barrel, a noise reduction cavity is formed in the barrel, an air inlet and an air outlet are formed in the two ends of the barrel respectively, two separation plates and baffles are sequentially arranged in the noise reduction cavity in the direction of the air outlet, the upper portions of the two separation plates are communicated with the lower portions of the two baffles respectively through connecting pipes, a plurality of through holes are formed in the lower portions of the separation plates, a plurality of air holes are formed in the upper portions of the baffles, a vent pipe is connected between the air inlet and the air outlet and penetrates through the separation plates and the baffles, a pneumatic control valve is arranged at the connecting position of the vent pipe and the air inlet, hollow noise reduction protrusions are further included, and the noise reduction protrusions are arranged on the through holes opposite to the direction of the air inlet. When air flow flowing into the air inlet is small, noise correspondingly generated by the air flow is small, the pneumatic control valve is directly closed, the air flow is directly exhausted out of the vent pipe through the air outlet, and the service life of a noise reduction device is prolonged.
Description
Technical field
The utility model relates to a kind of baffler, specifically refers to outlet pipe noise treatment device.
Background technique
In urban environment, traffic noise is the pollution sources that radiation is the strongest, impact is the widest.In motor vehicle noise, exhaust sound is one of main noise sound source, and its reduction is mainly by exhaust silencer being installed, must being produced a very large impact motor after fixing a silencer; The power loss of general silencing apparatus, 3% ~ 8%, allows larger power loss when sound deadening capacity is larger; The silencing apparatus of coupling low-powered engine more requires lower power loss.
The car owning amount of China is increasing, and people are no longer only the traffic tool to the requirement of automobile, more require the energy-conserving and environment-protective of car, attractive in appearance and comfortable.The traffic noise of motor vehicle is main sources of urban road noise, will be constantly strict for the legislations for noise of automobile.But in the time of general baffler production and processing, dissipative muffler and the reactive muffler mainly applied on the market at present, can only process high frequency or the noise of medium and low frequency individually, Applicable scope is wideless, and with regard to dissipative muffler: at high temperature, water vapour and sound-absorbing material is had in the gas of corrosive action, the working life of silencing apparatus is short, to low-frequency noise weak effect; Maximum drawback is exactly that silencing apparatus power loss is excessive; And not obvious to the treatment effect of noise at general single baffler filter opening, and then have influence on the efficiency of whole noise reduction operation.
Model utility content
The purpose of this utility model is to provide outlet pipe noise treatment device, reduces the infringement of air-flow to baffler, reduces the loss power of silencing apparatus.
The purpose of this utility model is achieved through the following technical solutions:
Outlet pipe noise treatment device, comprise cylindrical shell, in described cylindrical shell, be provided with silencing cavity, the two ends of cylindrical shell are respectively arranged with suction port and air outlet, in described silencing cavity, along air outlet direction, two demarcation strips and baffle plate are installed successively, connecting tube runs 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, the top of baffle plate is provided with multiple pores, between described air outlet and suction port, be also connected with breathing pipe, described breathing pipe runs through demarcation strip and baffle plate, be provided with pneumatic control valve at breathing pipe and suction port joint, also comprise the noise reduction projection of hollow, described noise reduction projection is arranged on through hole and is positioned at away from suction port direction.Traditional silencing apparatus in use, no matter throughput size, air-flow all can pass to carry out noise reduction processing in baffler internal structure, and a small amount of impurity or the corrosive deposit that are blended in air-flow can rest on baffler inside for a long time, can cause certain damage to its internal structure, reduce the power of baffler, when the utility model uses, air-flow is passed in breathing pipe by suction port, the pneumatic control valve that is arranged on suction port place can be controlled according to the size of throughput the flow direction of air-flow, in the time that throughput exceedes certain limit, pneumatic control valve is opened, air-flow is directly entered in the space that first demarcation strip and silencing cavity wall form by suction port, most air-flow enters into the space between second demarcation strip and baffle plate by connecting tube, the air-flow of remainder carries out noise reduction processing to it step by step by the through hole on two demarcation strips, the air-flow being passed into by suction port place enters in larger space environment suddenly in less space environment, only have near the sound wave of the minority frequency of through hole natural frequency to arrive the space between second demarcation strip and baffle plate by through hole, the sound wave of minority frequency can not pass through through hole in addition, can only constantly reflect in the common space forming of demarcation strip and silencing cavity end, until air-flow momentum disappears, 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, continue to start the noise reduction operation of second stage, and the noise reduction mode of first stage and the noise reduction mode of second stage are similar, the air-flow major part significantly being weakened enters in two connecting tubes between baffle plate, finally discharged by air outlet, near the sound wave of the minority frequency of remainder pore natural frequency could arrive air outlet by pore, the sound wave of minority frequency can not pass through pore in addition, can only constantly reflect in the common space forming of second baffle plate and silencing cavity the other end end, until air-flow momentum disappears, complete the noise reduction operation of second stage, finally reach good noise reduction object, and the part of the air-flow residue minute quantity of process silencing cavity remains in silencing cavity fast, reduce impact or the corrosion of residual fraction air-flow to baffler inside, reduce the loss power of silencing apparatus,
And when the throughput that be flowed into by suction port hour, the noise of the corresponding generation of air-flow is less, and pneumatic control valve directly cuts out, and air-flow directly has breathing pipe to discharge through air outlet, reduce the residual possibility of air-flow in silencing cavity, the working life that is conducive to improve baffler; Be arranged on the noise reduction projection of hollow on through hole, can carry out noise reduction processing to the noise being filtered by through hole, the sudden change that air-flow produces airflow volume in the noise reduction projection of being flowed through by through hole time, there is certain expansion in air-flow, in gas expansion self with energy just reduce gradually, and then increase the utility model at the treatment effect of the noise reduction operation of first stage.
Described noise reduction projection comprises taper round platform, and has spiral chute on taper round platform inwall.The taper round platform of hollow is arranged on through hole, the diameter of taper round platform increases gradually, and the minimum diameter of taper round platform is identical with through-hole diameter, therefore air-flow is entering after through hole, can directly in taper round platform, repeatedly expand, in inflation process, the kinetic energy of air-flow self can corresponding minimizing each time, and the spiral chute having on inwall can accelerate the minimizing of air-flow kinetic energy in inflation process, and then reduce pressure, speed and the density that air-flow passes through, reach the object of noise reduction processing.
The aperture of described through hole is greater than the diameter of pore.Through hole mainly plays the effect of the noise sound wave of screening through hole natural frequency in first stage noise reduction operation, pore is the effect of playing the noise sound wave of screening pore natural frequency in second stage noise reduction operation, after first stage noise reduction operation finishes, enter into the air-flow of second stage noise reduction operation in the time of air passing hole, the frequency spectrum of noise will be shifted to high frequency or ultra-high frequency, audible sound composition in frequency spectrum is obviously reduced, thereby reduce interference and injury to people; The aperture of through hole is greater than the aperture of pore, and both self intrinsic frequency difference can successively be eliminated the sound wave of different frequency, ensures that after airflow passes the utility model, peace and quiet are harmlessly discharged.
Be greater than the diameter near the pore on the baffle plate of air outlet away from the diameter of the pore on the baffle plate of air outlet.Second stage noise reduction operation is the final processing to noise sound wave in air-flow, aperture on second baffle plate to suction port to air outlet direction is less than the aperture of first baffle plate, make air-flow be graded again processing, through twice screening of second stage noise reduction operation, can thoroughly ensure that the noise in air-flow is completely eliminated.
Also comprise the silencing cotton that is arranged at cylinder inboard wall.After the noise in air-flow is completely by first stage and second stage noise reduction operation, the sound wave of low and medium frequency is thoroughly processed, remaining high frequency sound wave is absorbed by the numerous spaces on silencing cotton, after constantly transmitting and absorbing, ensures that in air-flow, noise is eliminated completely.
The utility model compared with prior art, has following advantage and beneficial effect:
1, the utility model outlet pipe noise treatment device, when the throughput being flowed into by suction port hour, the noise of the corresponding generation of air-flow is less, pneumatic control valve directly cuts out, air-flow directly has breathing pipe to discharge through air outlet, reduce the residual possibility of air-flow in silencing cavity, the working life that is conducive to improve baffler; Be arranged on the noise reduction projection of hollow on through hole, can carry out noise reduction processing to the noise being filtered by through hole, the sudden change that air-flow produces airflow volume in the noise reduction projection of being flowed through by through hole time, there is certain expansion in air-flow, in gas expansion self with energy just reduce gradually, and then increase the utility model at the treatment effect of the noise reduction operation of first stage;
2, the utility model outlet pipe noise treatment device, second stage noise reduction operation is the final processing to noise sound wave in air-flow, aperture on second baffle plate to suction port to air outlet direction is less than the aperture of first baffle plate, make air-flow be graded again processing, through twice screening of second stage noise reduction operation, can thoroughly ensure that the noise in air-flow is completely eliminated.
3, the utility model outlet pipe noise treatment device, after the noise in air-flow is completely by first stage and second stage noise reduction operation, the sound wave of low and medium frequency is thoroughly processed, remaining high frequency sound wave is absorbed by the numerous spaces on silencing cotton, after constantly transmitting and absorbing, ensure that in air-flow, noise is eliminated completely.
Brief description of the drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model embodiment, forms the application's a part, does not form the restriction to the utility model embodiment.In the accompanying drawings:
Fig. 1 is the utility model structural representation;
Fig. 2 is the structural representation of noise reduction projection;
Mark and corresponding component title in accompanying drawing:
1-cylindrical shell, 2-silencing cavity, 3-suction port, 4-air outlet, 5-demarcation strip, 6-baffle plate, 7-connecting tube, 8-through hole, 9-pore, 10-breathing pipe, 11-pneumatic control valve, 12-silencing cotton, 13-taper round platform, 14-spiral chute.
Embodiment
For making the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, exemplary embodiment of the present utility model and explanation thereof are only for explaining the utility model, and conduct is not to restriction of the present utility model.
Embodiment 1
As depicted in figs. 1 and 2, the utility model outlet pipe noise treatment device, comprise cylindrical shell 1, in described cylindrical shell 1, be provided with silencing cavity 2, the two ends of cylindrical shell 1 are respectively arranged with suction port 3 and air outlet 4, along air outlet 4 directions, two demarcation strips 5 and baffle plate 6 are installed successively described silencing cavity 2 is interior, 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, the top of baffle plate 6 is provided with multiple pores 9, between described air outlet 4 and suction port 3, be also connected with breathing pipe 10, described breathing pipe 10 runs through demarcation strip 5 and baffle plate 6, be provided with pneumatic control valve 11 in breathing pipe 10 and suction port 3 joints, also comprise the noise reduction projection of hollow, described noise reduction projection is arranged on through hole 8 and is positioned at away from suction port 3 directions, described noise reduction projection comprises taper round platform 13, and has spiral chute 14 on taper round platform 13 inwalls, the aperture of described through hole 8 is greater than the diameter of pore 9, be greater than the diameter near the pore 9 on the baffle plate 6 of air outlet 4 away from the diameter of the pore 9 on the baffle plate 6 of air outlet 4, also comprise the silencing cotton 12 that is arranged at cylindrical shell 1 inwall.
When the utility model uses, air-flow is passed in breathing pipe 10 by suction port 3, the pneumatic control valve 11 that is arranged on suction port 3 places can be controlled according to the size of throughput the flow direction of air-flow, in the time that throughput exceedes certain limit, 11 of pneumatic control valves are opened, air-flow is directly entered in the space that first demarcation strip 5 and silencing cavity 2 walls form by suction port 3, most air-flow enters into the space between second demarcation strip 5 and baffle plate 6 by connecting tube 7, the air-flow of remainder carries out noise reduction processing to it step by step by the through hole 8 on two demarcation strips 5, the air-flow being passed into by suction port 3 places enters in larger space environment suddenly in less space environment, only have near the sound wave of the minority frequency of through hole 8 natural frequencys to arrive the space between second demarcation strip 5 and baffle plate 6 by through hole 8, the sound wave of minority frequency can not pass through through hole 8 in addition, can only constantly reflect in the common space forming in demarcation strip 5 and silencing cavity 2 ends, until air-flow momentum disappears, 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, continue to start the noise reduction operation of second stage, and the noise reduction mode of first stage and the noise reduction mode of second stage are similar, the air-flow major part significantly being weakened enters in two connecting tubes 7 between baffle plate 6, finally discharged by air outlet 4, near the sound wave of the minority frequency of remainder pore 9 natural frequencys could arrive air outlet 4 by pore 9, the sound wave of minority frequency can not pass through pore 9 in addition, can only constantly reflect in the common space forming in second baffle plate 6 and silencing cavity 2 the other end ends, until air-flow momentum disappears, complete the noise reduction operation of second stage, finally reach good noise reduction object, and the part of the air-flow residue minute quantity of process silencing cavity 2 remains in silencing cavity 2 fast, reduce impact or the corrosion of residual fraction air-flow to baffler inside, reduce the loss power of silencing apparatus, and when the throughput that be flowed into by suction port 3 hour, the noise of the corresponding generation of air-flow is less, pneumatic control valve 11 directly cuts out, air-flow directly has breathing pipe 10 to discharge through air outlet 4,
Through hole 8 mainly plays the effect of the noise sound wave of screening through hole 8 natural frequencys in first stage noise reduction operation, pore 9 is the effect of playing the noise sound wave of screening pore 9 natural frequencys in second stage noise reduction operation, after first stage noise reduction operation finishes, enter into the air-flow of second stage noise reduction operation in the time of air passing hole 9, the frequency spectrum of noise will be shifted to high frequency or ultra-high frequency, audible sound composition in frequency spectrum is obviously reduced, thereby reduce interference and injury to people; The aperture of through hole 8 is greater than the aperture of pore 9, and both self intrinsic frequency difference can successively be eliminated the sound wave of different frequency, ensures that after airflow passes the utility model, peace and quiet are harmlessly discharged; Air-flow major part through first stage noise reduction operation is passed in the spatial joint clearance between the second demarcation strip 5 and first baffle plate 6 by connecting tube 7 mouths of pipe, the just position to pore 9 of connecting tube 7 mouths of pipe, the air-flow that makes Rapid Flow cross connecting tube 7 is directly screened by pore 9, and the connecting tube 7 that remaining air-flow is connected by baffle plate 6 bottoms is again discharged, increase the efficiency that pore 9 screens sound wave; Second stage noise reduction operation is the final processing to noise sound wave in air-flow, aperture on second baffle plate 6 to suction port 3 to air outlet 4 directions is less than the aperture of first baffle plate 6, make air-flow be graded again processing, through twice screening of second stage noise reduction operation, can thoroughly ensure that the noise in air-flow is completely eliminated; The taper round platform 13 of hollow is arranged on through hole 8, the diameter of taper round platform 13 increases gradually, and the minimum diameter of taper round platform 13 is identical with through hole 8 diameters, therefore air-flow is entering after through hole 8, can directly in taper round platform 13, repeatedly expand, in inflation process, the kinetic energy of air-flow self can corresponding minimizing each time, and the spiral chute 14 having on inwall can accelerate the minimizing of air-flow kinetic energy in inflation process, and then reduce pressure, speed and the density that air-flow passes through, reach the object of noise reduction processing.
After the noise in air-flow is completely by first stage and second stage noise reduction operation, the sound wave of low and medium frequency is thoroughly processed, remaining high frequency sound wave is absorbed by the numerous spaces on silencing cotton 12, after constantly transmitting and absorbing, ensures that in air-flow, noise is eliminated completely.
Above-described embodiment; the purpose of this utility model, technological scheme and beneficial effect are further described; institute is understood that; the foregoing is only embodiment of the present utility model; and be not used in limit protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. outlet pipe noise treatment device, comprise cylindrical shell (1), in described cylindrical shell (1), be provided with silencing cavity (2), the two ends of cylindrical shell (1) are respectively arranged with suction port (3) and air outlet (4), it is characterized in that: in described silencing cavity (2), along air outlet, (4) direction is provided with two demarcation strips (5) and baffle plate (6) successively, the top of (7) two demarcation strips of connecting tube (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), the top of baffle plate (6) is provided with multiple pores (9), between described air outlet (4) and suction port (3), be also connected with breathing pipe (10), described breathing pipe (10) runs through demarcation strip (5) and baffle plate (6), be provided with pneumatic control valve (11) in breathing pipe (10) and suction port (3) joint, also comprise the noise reduction projection of hollow, described noise reduction projection is arranged on through hole (8) above and is positioned at away from suction port (3) direction.
2. outlet pipe noise treatment device according to claim 1, is characterized in that: described noise reduction projection comprises taper round platform (13), and has spiral chute (14) on taper round platform (13) inwall.
3. outlet pipe noise treatment device according to claim 1, is characterized in that: the aperture of described through hole (8) is greater than the diameter of pore (9).
4. outlet pipe noise treatment device according to claim 1, is characterized in that: be greater than the diameter near the pore (9) on the baffle plate (6) of air outlet (4) away from the diameter of the pore (9) on the baffle plate (6) of air outlet (4).
5. according to the outlet pipe noise treatment device described in claim 1 ~ 4 any one, it is characterized in that: also comprise the silencing cotton (12) that is arranged at cylindrical shell (1) inwall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121692.0U CN203742738U (en) | 2014-03-18 | 2014-03-18 | Noise treatment device for exhaust pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121692.0U CN203742738U (en) | 2014-03-18 | 2014-03-18 | Noise treatment device for exhaust pipe |
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| Publication Number | Publication Date |
|---|---|
| CN203742738U true CN203742738U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420121692.0U Expired - Fee Related CN203742738U (en) | 2014-03-18 | 2014-03-18 | Noise treatment device for exhaust pipe |
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| Country | Link |
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| CN (1) | CN203742738U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153849A (en) * | 2014-03-18 | 2014-11-19 | 成都陵川常友汽车部件制造有限公司 | Tail gas and noise processing mechanism |
| 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 |
| CN106593579A (en) * | 2016-12-15 | 2017-04-26 | 重庆泽创机电有限公司 | Muffler main body assembly |
-
2014
- 2014-03-18 CN CN201420121692.0U patent/CN203742738U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153849A (en) * | 2014-03-18 | 2014-11-19 | 成都陵川常友汽车部件制造有限公司 | Tail gas and noise processing mechanism |
| 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 |
| CN106593579A (en) * | 2016-12-15 | 2017-04-26 | 重庆泽创机电有限公司 | Muffler main body assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20150318 |
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| EXPY | Termination of patent right or utility model |