CN103114888A - Noise elimination unit of silencer and silencer using noise elimination unit - Google Patents
Noise elimination unit of silencer and silencer using noise elimination unit Download PDFInfo
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- CN103114888A CN103114888A CN2013100403563A CN201310040356A CN103114888A CN 103114888 A CN103114888 A CN 103114888A CN 2013100403563 A CN2013100403563 A CN 2013100403563A CN 201310040356 A CN201310040356 A CN 201310040356A CN 103114888 A CN103114888 A CN 103114888A
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- dividing plate
- noise elimination
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Abstract
The invention discloses a noise elimination unit of a silencer and the silencer using the noise elimination unit. The noise elimination unit comprises a noise elimination cotton layer for absorbing high-frequency noise which enters into an exhausting cavity and a noise elimination clapboard which is in top press fit with the front end of the noise elimination cotton layer, wherein the material of the noise elimination clapboard is foamed aluminium for absorbing parts of low and medium frequency noise. The noise elimination unit further comprises a limiting clapboard which is in top press fit with the front end of the noise elimination cotton layer, wherein a vent hole for tail gas passing and a socketing hole for an air outlet pipe penetrating are formed in the limiting clapboard, and the limiting clapboard is used for being arranged in an interval mode with a rear end cover of a barrel to enable a part of the exhausting cavity between the clapboard and the rear end cover to form a rear end air resonant cavity for absorbing medium frequency noise. The noise elimination unit and the silencer using the noise elimination unit can well weaken tail gas noise of every frequency range and have good absorbing effect as a whole.
Description
Technical field
The present invention relates to the vent systems of passenger cars diesel engines, be specifically related to two kinds of silencing apparatuss, wherein a kind of broadband muffler for having more excellent silencing noise performance, another kind of for having the integrated form SCR catalyzed conversion silencing apparatus of more excellent silencing noise performance and catalytic conversion performance concurrently.
Background technique
The diesel motor exhaust post-processing technology is the catalyzer that adheres on the inside cavity integrated catalytic agent carrier of silencing apparatus and carrier, be selective catalytic reduction technology (SCR), adopt the silencing apparatus of this technology for reaching state's IV and above emission standard, must arrange the catalyst carrier greater than certain-length, so that when allowing tail gas by carrier can and the carrier space on the catalyzer that adheres to the sufficient haptoreaction time is arranged, guarantee that harmful gas and catalyzer in tail gas fully react the generation innocuous gas, thereby make motor exhaust can satisfy discharging standards.The carrier of laying in existing noise elimination cavity and catalyzer have taken larger space in the noise elimination cavity, thereby affect the soundproof effect of certain silencing apparatus volume.Simultaneously, motor exhaust has increased the exhaust back pressure of motor by with the carrier in space the time, has lost engine power, causes reduction and the energy waste of engine performance.
Application number is that 201020539583.2 Chinese patent discloses a kind of SCR catalytic muffler, in the cylindrical shell of this silencing apparatus along its axially successively the interval be furnished with air distribution plate, catalyst unit and muffling unit, cylinder lumen is divided into air-inlet cavity from front to back successively like this, turbulent flow is regulated chamber and exhaust cavity, wherein, muffling unit is positioned at exhaust cavity, consisted of by noise elimination dividing plate and the cotton layer of eliminating the noise, axially be fitted with suction tude in air-inlet cavity, axially be fitted with outlet pipe in exhaust cavity; Contained nitrogen oxide during the SCR catalyst selectivity ground reduction of catalyst unit and removing are discarded, reach the purpose of tail gas clean-up, evenly be provided with some dispensing orifices on air distribution plate, being conducive to like this tail gas enters in catalyst unit uniformly, reduce simultaneously the tail gas airspeed, increase tail gas in the holdup time of catalyst unit, improve catalytic efficiency.This silencing apparatus has guaranteed tail gas and the abundant haptoreaction of catalyzer by air distribution plate is installed, and therefore can reduce accordingly the length of catalyst unit, and then reduce the length of whole silencing apparatus; And after the tail gas of catalysis enters in exhaust cavity, partial tail gas directly enters outlet pipe through outlet pipe air inlet port, separately there is partial tail gas to enter outlet pipe through the hole of noise elimination dividing plate, the areole of eliminate the noise cotton layer and outlet pipe, the cotton layer of eliminating the noise adopts fiber glass material, be installed between noise elimination dividing plate and cylinder back-end lid, tail gas passes the cotton layer of noise elimination and causes the glass fibre vibration, the part that dissipated high-frequency noise.But because the cotton layer of eliminating the noise can only the absorbing high-frequency noise, in can't absorbing, low-frequency noise, so this silencing apparatus can't weaken the tail gas noise of each frequency range, still Shortcomings part.
Summary of the invention
The purpose of this invention is to provide a kind of muffling unit that can weaken the tail gas different frequency range noise in silencing apparatus, two kinds of silencing apparatuss that use this muffling unit are provided simultaneously, wherein a kind of is integrated form catalyzed conversion silencing apparatus, and another kind is broadband muffler.
integrated form catalyzed conversion silencing apparatus of the present invention adopts following technological scheme: a kind of integrated form catalyzed conversion silencing apparatus, comprise have before, the cylindrical shell of rear end cover, be arranged at intervals with successively from front to back in cylindrical shell cylinder lumen is divided into air-inlet cavity, turbulent flow is regulated the chamber, the air distribution plate of exhaust cavity and catalyst unit, comprise that also an end is inserted in exhaust cavity, axis is along the outlet pipe of fore-and-aft direction, also be provided with muffling unit in described exhaust cavity, muffling unit comprise for the cotton layer of the noise elimination of absorbing high-frequency noise and with the noise elimination dividing plate of the cotton layer front end top press fit of eliminating the noise, the material of described noise elimination dividing plate is for being used for the foamed aluminium of absorption portion Middle and low frequency noise, muffling unit also comprises the spacing dividing plate with the front end top press fit of the cotton layer of eliminating the noise, spacing dividing plate has the vent that passes through for tail gas and the spliced eye that passes for outlet pipe, and spacing dividing plate and rear end cover interval are arranged so that between the two exhaust cavity partly is formed for absorbing the tail end air resonance chamber of mid-frequency noise, also be distributed with the perforation that is communicated with described tail end air resonance chamber on the sidewall of described outlet pipe.
Described catalyst unit comprises that the gap is inserted into the carrier of the cordierite in cylindrical shell and is attached to the interior catalyzer of carrier honeycomb hole, is fitted with the carrier fixed bolster in the gap between carrier and cylindrical shell.
The material of described air distribution plate is foamed aluminium.
This silencing apparatus also comprise an end be inserted in described air-inlet cavity, axis is perpendicular to the suction tude of fore-and-aft direction.
broadband muffler of the present invention adopts following technological scheme: a kind of broadband muffler, comprise the cylindrical shell with rear end cover, be provided with muffling unit in the exhaust cavity of cylindrical shell, muffling unit comprise for the cotton layer of the noise elimination of absorbing high-frequency noise and with the noise elimination dividing plate of the cotton layer front end top press fit of eliminating the noise, the material of described noise elimination dividing plate is for being used for the foamed aluminium of absorption portion Middle and low frequency noise, muffling unit also comprises the spacing dividing plate with the front end top press fit of the cotton layer of eliminating the noise, spacing dividing plate has the vent that passes through for tail gas and the spliced eye that passes for outlet pipe, and spacing dividing plate and rear end cover interval are arranged so that between the two exhaust cavity partly is formed for absorbing the tail end air resonance chamber of mid-frequency noise, also be distributed with the perforation that is communicated with described tail end air resonance chamber on the sidewall of described outlet pipe.
the muffling unit of silencing apparatus of the present invention adopts following technological scheme: a kind of muffling unit of silencing apparatus, comprise for absorption enter the high-frequency noise in exhaust cavity the cotton layer of noise elimination and with the noise elimination dividing plate of the cotton layer front end top press fit of eliminating the noise, the material of described noise elimination dividing plate is for being used for the foamed aluminium of absorption portion Middle and low frequency noise, muffling unit also comprises the spacing dividing plate with the front end top press fit of the cotton layer of eliminating the noise, spacing dividing plate has the vent that passes through for tail gas and the spliced eye that passes for outlet pipe, and spacing dividing plate is used for covering the interval with cylinder back-end and is arranged so that exhaust cavity between the two partly forms the tail end air resonance chamber that absorbs mid-frequency noise.
Adopt said structure silencing apparatus muffling unit and use the silencing apparatus of this muffling unit, due to muffling unit except the cotton layer of eliminating the noise, also comprise the tail end air resonance chamber between spacing dividing plate and cylinder back-end lid, add that the noise elimination dividing plate adopts foamed aluminium, make like this muffling unit have three kinds of acoustic impedance mediums that density of material is different with acoustic propagation velocity, be foamed aluminium, glass fibre and air, the process that noise sees through them forms multistage refraction and reflection, can well weaken the tail gas noise of each frequency range.Wherein, foamed aluminium can cancellation part Middle and low frequency noise, the glass fibre vibrational energy dissipative part high-frequency noise that tail gas causes by the cotton layer of eliminating the noise, and the resonance that tail gas produces by tail end air resonance chamber can be eliminated the mid-frequency noise of special frequency channel.Therefore, this muffling unit and use the silencing apparatus of this muffling unit can well weaken the tail gas noise of each frequency range, and good assimilation effect is arranged on the whole.
Further, be fitted with the carrier fixed bolster in the carrier of catalyst unit and the gap between cylindrical shell, carrier fixedly is lined with certain cushioning effect, can further fall low noise generation.
Further, air distribution plate also adopts the foamed aluminium material, can enter the turbulent part Middle and low frequency noise of regulating in the process of chamber by air-inlet cavity by cancellation tail gas equally.
Description of drawings
Fig. 1 is the external structure schematic diagram of integrated form catalyzed conversion silencing apparatus of the present invention;
Fig. 2 is the sectional view of Fig. 1;
Fig. 3 is the structural representation of the noise elimination dividing plate in Fig. 2;
Fig. 4 is the structural representation of the spacing dividing plate in Fig. 2;
Fig. 5 is the structural representation of the catalyst unit carrier in Fig. 2;
Fig. 6 is the embodiment's of broadband muffler of the present invention structural representation.
Embodiment
The embodiment of integrated form catalyzed conversion silencing apparatus of the present invention: as shown in Fig. 1-5, comprise cylindrical shell 3, suction tude 4, air distribution plate 10, catalyst unit, muffling unit and outlet pipe 1, the rear and front end of cylindrical shell 3 is sealed respectively and is provided with front cover 5 and rear end cover 2, air distribution plate 10 and catalyst unit from front to back successively the interval be arranged in cylindrical shell 3, with cylinder lumen be divided into successively air-inlet cavity 11, turbulent flow is regulated chamber 13 and exhaust cavity 15.Wherein, muffling unit is arranged on the rearward end of exhaust cavity 15, and the exhaust cavity between muffling unit and catalyst unit has partly formed expansion cavity like this; One end of suction tude 4 radially is inserted in air-inlet cavity 11 along cylindrical shell 3, is distributed with suction tude perforation 12 on the wall portion of the insertion air-inlet cavity 11 of suction tude 4; One end of outlet pipe 1 is inserted in expansion cavity after cylindrical shell 3 axially passes muffling unit, is distributed with on the wall portion of the insertion exhaust cavity 15 of outlet pipe 1 and the partially communicating outlet pipe perforation 17 of muffling unit place exhaust cavity.Before and after muffling unit comprises spaced apart noise elimination dividing plate 8 and spacing dividing plate 6 and be installed in noise elimination dividing plate 8 and spacing dividing plate 6 between the cotton layer 7 of noise elimination, the cotton layer 7 of eliminating the noise adopts fiber glass material, spacing dividing plate 6 arranges with rear end cover 2 intervals, makes like this exhaust cavity between spacing dividing plate 6 and rear end cover 2 partly form tail end air resonance chamber 16.Because outlet pipe 1 radially passes muffling unit, has the noise elimination partition board hole 81 that passes for outlet pipe 1 on the end face of noise elimination dividing plate 8, have the noise elimination cotton layer hole of passing for outlet pipe 1 on the end face of the cotton layer 7 of noise elimination, have the spacing partition board hole 62 that passes for outlet pipe 1 on the end face of spacing dividing plate 6; In addition, noise elimination dividing plate 8 adopts the foamed aluminium material, also offer vent 61 on the end face of spacing dividing plate 6, guarantee to enter smoothly after tail gas is through the cotton layer 7 of eliminating the noise tail end air resonance chamber 16, and outlet pipe perforation 17 exhaust cavity part and tail end air resonance chamber 16 connections corresponding with the cotton layer 7 of eliminating the noise respectively.
The tail gas that diesel engine is discharged is entered by suction tude 4, then regulate chamber 13, catalyst unit and exhaust cavity 15 through air-inlet cavity 11, air distribution plate 10, turbulent flow successively, in exhaust cavity 15, partial tail gas enters outlet pipe 1 through muffling unit, because muffling unit adopts three kinds of acoustic impedance mediums that density of material is different with acoustic propagation velocity, be foamed aluminium, glass fibre and air, tail gas differs larger Propagation and produces refraction and reflection in these three kinds of impedance, thereby can reach the purpose that weakens tail gas different frequency range noise.In this process, tail gas passes noise elimination dividing plate 8 cancellation part Middle and low frequency noises, eliminate the noise cotton layer 7 and cause that its glass fibre vibration part high-frequency noises that dissipated, tail gas finally enter tail end air resonance chamber 16 and resonance occur and eliminate the mid-frequency noise of special frequency channel thereby tail gas passes.
In the present embodiment, catalyst unit comprises that the gap is inserted into the carrier 9 in cylindrical shell 3 and is inserted into carrier fixed bolster 14 in carrier 9 and cylindrical shell 3 gaps, carrier 9 adopts the steinheilite with honeycomb porous structure, be attached with catalyzer on the inwall of honeycomb hole, during tail gas process carrier 9, react with catalyzer and be reduced into innocuous gas, meanwhile, the carrier fixed bolster 14 that is inserted between carrier 9 and cylindrical shell 3 has certain cushioning effect, thereby reduces the noise of carrier 9 and cylindrical shell 3 vibrations generations.In addition, air distribution plate 10 also adopts the foamed aluminium material, the space of foamed aluminium can reduce airspeed, thereby extend tail gas through the time of carrier, tail gas is fully contacted with catalyzer, improve catalyzer to the reduction conversion ratio of tail gas, finally improve catalytic effect, and foamed aluminium can also cancellation tail gas part Middle and low frequency noise during by air distribution plate 10.
During above-described embodiment specific works, the tail gas of diesel engine emissions is entered in air-inlet cavity 11 by suction tude 4 perforation, eliminated the part low-frequency noise in the interior gas flaring process of air-inlet cavity 11, then tail gas passes air distribution plate 10 and enters the turbulent chamber 13 of regulating, owing to being covered with the space on air distribution plate 10 and orientation is inconsistent, thereby can reduce the airspeed of tail gas; Then under the effect of pressure difference, tail gas is by catalyst unit, and the reduction of airspeed has simultaneously fully extended reaction time of tail gas and catalyzer, has improved catalytic efficiency; After catalyst unit, tail gas enters in exhaust cavity 15, in the expansion cavity of exhaust cavity 15, most of tail gas is directly discharged by the exhaust port of outlet pipe 1, separately there is partial tail gas to enter in tail end air resonance chamber 16 through noise elimination dividing plate 8, the cotton layer 7 of eliminating the noise, spacing dividing plate 6 successively, and enters the interior discharge of outlet pipe 1 by outlet pipe perforation 17.
The embodiment of broadband muffler of the present invention: as shown in Figure 6, the difference of the integrated form catalyzed conversion silencing apparatus of the present embodiment and above-described embodiment is: catalyst unit is not set in cylindrical shell 31, described air distribution plate 101 is divided into air-inlet cavity and exhaust cavity with cylinder lumen, muffling unit still is arranged in exhaust cavity, the structure of the muffling unit in the structure of muffling unit and above-described embodiment is consistent, and its content does not repeat them here.
The embodiment of the muffling unit of silencing apparatus of the present invention: as shown in Fig. 2,3,4, the structure of the muffling unit in the structure of the muffling unit of the present embodiment and above-mentioned two embodiments is all consistent, and its content does not repeat them here.
Claims (6)
1. integrated form catalyzed conversion silencing apparatus, comprise have before, the cylindrical shell of rear end cover, be arranged at intervals with successively from front to back in cylindrical shell cylinder lumen is divided into air-inlet cavity, turbulent flow is regulated the chamber, the air distribution plate of exhaust cavity and catalyst unit, comprise that also an end is inserted in exhaust cavity, axis is along the outlet pipe of fore-and-aft direction, also be provided with muffling unit in described exhaust cavity, muffling unit comprise for the cotton layer of the noise elimination of absorbing high-frequency noise and with the noise elimination dividing plate of the cotton layer front end top press fit of eliminating the noise, it is characterized in that: the material of described noise elimination dividing plate is for being used for the foamed aluminium of absorption portion Middle and low frequency noise, muffling unit also comprises the spacing dividing plate with the front end top press fit of the cotton layer of eliminating the noise, spacing dividing plate has the vent that passes through for tail gas and the spliced eye that passes for outlet pipe, and spacing dividing plate and rear end cover interval are arranged so that between the two exhaust cavity partly is formed for absorbing the tail end air resonance chamber of mid-frequency noise, also be distributed with the perforation that is communicated with described tail end air resonance chamber on the sidewall of described outlet pipe.
2. integrated form catalyzed conversion silencing apparatus according to claim 1, it is characterized in that: described catalyst unit comprises that the gap is inserted into the carrier of the cordierite in cylindrical shell and is attached to the interior catalyzer of carrier honeycomb hole, is fitted with the carrier fixed bolster in the gap between carrier and cylindrical shell.
3. integrated form catalyzed conversion silencing apparatus according to claim 1, it is characterized in that: the material of described air distribution plate is foamed aluminium.
4. according to claim 1 and 2 or 3 described integrated form catalyzed conversion silencing apparatuss is characterized in that: this silencing apparatus also comprise an end be inserted in described air-inlet cavity, axis is perpendicular to the suction tude of fore-and-aft direction.
5. broadband muffler, comprise the cylindrical shell with rear end cover, be provided with muffling unit in the exhaust cavity of cylindrical shell, muffling unit comprise for the cotton layer of the noise elimination of absorbing high-frequency noise and with the noise elimination dividing plate of the cotton layer front end top press fit of eliminating the noise, it is characterized in that: the material of described noise elimination dividing plate is for being used for the foamed aluminium of absorption portion Middle and low frequency noise, muffling unit also comprises the spacing dividing plate with the front end top press fit of the cotton layer of eliminating the noise, spacing dividing plate has the vent that passes through for tail gas and the spliced eye that passes for outlet pipe, and spacing dividing plate and rear end cover interval are arranged so that between the two exhaust cavity partly is formed for absorbing the tail end air resonance chamber of mid-frequency noise, also be distributed with the perforation that is communicated with described tail end air resonance chamber on the sidewall of described outlet pipe.
6. the muffling unit of a silencing apparatus, comprise for absorption enter the high-frequency noise in exhaust cavity the cotton layer of noise elimination and with the noise elimination dividing plate of the cotton layer front end top press fit of eliminating the noise, it is characterized in that: the material of described noise elimination dividing plate is for being used for the foamed aluminium of absorption portion Middle and low frequency noise, muffling unit also comprises the spacing dividing plate with the front end top press fit of the cotton layer of eliminating the noise, spacing dividing plate has the vent that passes through for tail gas and the spliced eye that passes for outlet pipe, and spacing dividing plate is used for covering the interval with cylinder back-end and is arranged so that exhaust cavity between the two partly forms the tail end air resonance chamber that absorbs mid-frequency noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310040356.3A CN103114888B (en) | 2013-02-01 | 2013-02-01 | The muffling unit of sourdine and use the sourdine of this muffling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310040356.3A CN103114888B (en) | 2013-02-01 | 2013-02-01 | The muffling unit of sourdine and use the sourdine of this muffling unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103114888A true CN103114888A (en) | 2013-05-22 |
| CN103114888B CN103114888B (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310040356.3A Expired - Fee Related CN103114888B (en) | 2013-02-01 | 2013-02-01 | The muffling unit of sourdine and use the sourdine of this muffling unit |
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| Country | Link |
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| CN (1) | CN103114888B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523074A (en) * | 2016-12-27 | 2017-03-22 | 江苏英田专用车制造有限公司 | Front silencer for passenger car |
| CN109899132A (en) * | 2017-12-11 | 2019-06-18 | 郑州宇通客车股份有限公司 | Exhaust pipe preprocessor and vehicle |
| CN112696257A (en) * | 2020-12-29 | 2021-04-23 | 湖南中联重科智能高空作业机械有限公司 | Exhaust muffler device and off-road work system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08319817A (en) * | 1995-05-29 | 1996-12-03 | Fujitsubo Giken Kogyo Kk | Muffler for vehicle |
| CN2646393Y (en) * | 2003-08-27 | 2004-10-06 | 洛阳西苑车辆与动力检验所有限公司 | Four-chamber impedance composite type exhaust muffler of engine |
| CN201723278U (en) * | 2010-05-28 | 2011-01-26 | 东北大学 | Foamed-aluminum silencer |
| CN201874642U (en) * | 2010-09-25 | 2011-06-22 | 苏州派格力减排系统有限公司 | SCR (Selective Catalytic Reduction) catalyzing muffler |
| CN203230480U (en) * | 2013-02-01 | 2013-10-09 | 郑州宇通客车股份有限公司 | Silencer noise abatement unit and silencer using noise abatement unit |
-
2013
- 2013-02-01 CN CN201310040356.3A patent/CN103114888B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08319817A (en) * | 1995-05-29 | 1996-12-03 | Fujitsubo Giken Kogyo Kk | Muffler for vehicle |
| CN2646393Y (en) * | 2003-08-27 | 2004-10-06 | 洛阳西苑车辆与动力检验所有限公司 | Four-chamber impedance composite type exhaust muffler of engine |
| CN201723278U (en) * | 2010-05-28 | 2011-01-26 | 东北大学 | Foamed-aluminum silencer |
| CN201874642U (en) * | 2010-09-25 | 2011-06-22 | 苏州派格力减排系统有限公司 | SCR (Selective Catalytic Reduction) catalyzing muffler |
| CN203230480U (en) * | 2013-02-01 | 2013-10-09 | 郑州宇通客车股份有限公司 | Silencer noise abatement unit and silencer using noise abatement unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523074A (en) * | 2016-12-27 | 2017-03-22 | 江苏英田专用车制造有限公司 | Front silencer for passenger car |
| CN109899132A (en) * | 2017-12-11 | 2019-06-18 | 郑州宇通客车股份有限公司 | Exhaust pipe preprocessor and vehicle |
| CN112696257A (en) * | 2020-12-29 | 2021-04-23 | 湖南中联重科智能高空作业机械有限公司 | Exhaust muffler device and off-road work system |
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| Publication number | Publication date |
|---|---|
| CN103114888B (en) | 2016-06-01 |
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