CN107701264B - Integrated exhaust purification muffler for improving sound quality - Google Patents
Integrated exhaust purification muffler for improving sound quality Download PDFInfo
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- CN107701264B CN107701264B CN201711198418.8A CN201711198418A CN107701264B CN 107701264 B CN107701264 B CN 107701264B CN 201711198418 A CN201711198418 A CN 201711198418A CN 107701264 B CN107701264 B CN 107701264B
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- muffler
- expansion cavity
- end cover
- pipe
- cavity
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- 238000000746 purification Methods 0.000 title claims abstract description 17
- 238000005192 partition Methods 0.000 claims abstract description 39
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000004202 carbamide Substances 0.000 claims abstract description 37
- 230000003197 catalytic effect Effects 0.000 claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003584 silencer Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 230000030279 gene silencing Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001743 silencing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention relates to an integrated exhaust purification muffler for improving sound quality, which comprises an air inlet pipe, a muffler shell, a front end cover, a rear end cover, an air outlet pipe, a urea nozzle, a urea mixing structure, a first partition plate, a second partition plate, a first catalytic converter, a second catalytic converter, a perforated short pipe and a resonance pipe, wherein the air inlet pipe is connected with the front end cover; the air inlet pipe and the urea nozzle are welded on the front end cover, the first expansion cavity is formed by the primary catalytic converter and the front end cover, and the urea mixing structure is positioned in the first expansion cavity; a second expansion cavity is formed between the two-stage catalytic converters, a third expansion cavity is formed between the two-stage catalytic converters and the first partition board, a fourth expansion cavity is formed between the first partition board and the second partition board, and the perforated short pipe is communicated with the third expansion cavity and the fourth expansion cavity; the second partition plate and the rear end cover form a resonant cavity, and the resonant tube is communicated with the third expansion cavity and the resonant cavity; the air outlet pipe is communicated with the fourth expansion cavity and the external atmosphere. The invention has compact structure, better control effect on low-frequency order noise and can effectively improve the quality of exhaust sound.
Description
Technical Field
The invention relates to the field of commercial vehicle exhaust systems, in particular to an integrated exhaust purification muffler capable of effectively improving the quality of exhaust sound.
Background
With the increasing sales of automobiles, the problem of exhaust emission and noise pollution of automobiles becomes a worldwide environmental problem which plagues the healthy development of various cities. Domestic diesel vehicles have low specific gravity in the total amount of automobiles, but the emission of main pollutants in two atmospheres of nitrogen oxides (NOx) and Particulate Matters (PM) mainly comes from diesel vehicles, so that the emission standards of multiple countries are continuously improved in recent years. Meanwhile, in the main noise source of urban traffic in China, the noise radiation acoustic energy of commercial vehicles is generally several times that of common passenger vehicles, wherein the noise outside the diesel buses and heavy-duty trucks is 20 to 50 times that of common sedans, so that strict standards are formulated for the noise limit value outside the heavy-duty commercial vehicles in various countries, and the requirements are improved year by year. Stringent diesel emission standards and noise limits place higher design demands on exhaust aftertreatment systems. The exhaust system of the existing diesel engine is developed towards an integrated direction, namely, an exhaust gas purifying treatment system and an exhaust muffler structure are integrated together, so that the requirements of light weight and space arrangement are met. However, the existing integrated exhaust purification muffler is lack of a mature design scheme, and the designed scheme has poor middle and low frequency silencing performance, especially has insufficient reduction of order noise of an engine, and seriously affects the sound quality of the whole vehicle.
Disclosure of Invention
The invention aims to provide an integrated exhaust purification muffler for improving sound quality, which solves the problems of insufficient low-frequency noise control capability and poor sound quality of exhaust noise of the existing integrated purification muffler for diesel engines. The muffler has reasonable structural design and simple process, and can effectively control the low-frequency order noise of the exhaust of the engine, thereby improving the quality of exhaust sound. Meanwhile, the design scheme can meet the national exhaust emission standard requirement, has compact structure and high integration, and is beneficial to the space arrangement of an exhaust system.
The invention adopts the following technical scheme:
an integrated exhaust purification muffler for improving sound quality comprises a flange, an air inlet pipe, a muffler shell, a front end cover, a rear end cover, an air outlet pipe, a urea nozzle, a urea mixing structure, a first partition plate, a second partition plate, a primary catalytic converter, a secondary catalytic converter, a perforated short pipe and a resonance pipe; the flange is welded with the front end of the air inlet pipe and is used for connecting the exhaust purification muffler with the exhaust pipe; the muffler shell, the front end cover and the rear end cover form the outer boundary of the muffler to determine the total volume of the muffler; the air inlet pipe and the urea nozzle are welded on the front end cover; the front end of the primary catalytic converter, the front end cover and the muffler shell form a first expansion cavity; the urea mixing structure is positioned in the first expansion cavity and is used for disturbing the airflow sprayed into the cavity through the air inlet pipe, so that urea spray and the airflow are uniformly mixed, and the conversion efficiency of tail gas is improved; the first catalytic converter and the second catalytic converter are separated by a certain distance to form a second expansion cavity; the rear end face of the secondary catalytic converter, the first partition plate and the muffler shell form a third expansion cavity; the first partition plate, the second partition plate and the muffler shell form a fourth expansion cavity; the perforated short pipe is welded and fixed on the first partition board and the second partition board and is used for communicating the third expansion cavity and the fourth expansion cavity; the second partition plate, the rear end cover and the muffler shell form a resonant cavity; the resonance tube is welded and fixed on the first partition board and the second partition board and is communicated with the third expansion cavity and the resonance cavity; the air outlet pipe is welded and fixed on the second partition plate and the rear end cover and communicated with the fourth expansion cavity and the external atmosphere.
As a further scheme of the invention, the exhaust purification muffler further comprises a sensor mounting seat, wherein the sensor mounting seat is welded with the muffler shell and is used for mounting a detection sensor of the aftertreatment system and feeding back an exhaust state signal.
As the preferable scheme of the invention, the urea mixing structure consists of a front supporting plate, a rear supporting plate and a perforated rough circular tube; the front support plate and the rear support plate are welded at two ends of the perforated thick circular tube and are fixedly welded with the muffler shell, and are used for supporting the whole urea mixing structure.
As a preferable scheme of the invention, the perforated short pipe is composed of two short pipes with the same structure, the central axes of the muffler are symmetrically distributed, and the rear end of the perforated short pipe is sealed by an end cover, so that the air flow of the third expansion cavity flows into the fourth expansion cavity from the perforations on the perforated section of the short pipe.
As a preferable mode of the invention, the resonance tube is bent to 90 degrees, and the bent portion is positioned in the resonance cavity.
As a preferable scheme of the invention, the front half part of the air outlet pipe is a perforated straight pipe section, and the outer side of the perforated straight pipe section is wrapped with a resistive bag for absorbing sound; the rear half part of the air outlet pipe is a bent pipe section which is bent by a certain angle, so that the exhaust air is discharged to the rear lower part.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the integrated exhaust purification muffler provided by the invention has a better control effect on middle-low frequency exhaust noise elimination, especially on low-frequency order noise of an engine, and can effectively improve the sound quality of the exhaust noise;
2. the integrated exhaust purification muffler can efficiently catalyze and convert exhaust pollutants, meets the requirements of the tail gas emission standard regulated in the current stage of China, and simultaneously has reasonable exhaust back pressure and meets the power requirements of a diesel engine;
3. the integrated exhaust purification muffler has the advantages of compact structure, small occupied space, easy realization of a manufacturing process and low cost, is suitable for the requirement of mass production, and effectively improves the market competitiveness of enterprises.
Drawings
Fig. 1 is a schematic sectional view of an integrated exhaust gas purifying muffler according to the present invention.
Fig. 2 is a schematic perspective view of a urea mixing structure of the integrated exhaust purifying muffler of the present invention.
Fig. 3 is a schematic view of the structure of the perforated pipe nipple of the integrated exhaust purifying muffler of the present invention.
Fig. 4 is a schematic view of the resonance tube structure of the integrated exhaust purifying muffler of the present invention.
Fig. 5 is a schematic view of the structure of an outlet pipe of the integrated exhaust purifying muffler of the present invention.
Fig. 6 is a graph showing the transmission loss with frequency according to one embodiment of the present invention.
In the figure: 1 is a flange; 2 is an air inlet pipe; 3 is a urea nozzle; 4 is a front end cover; 5 is a first expansion chamber; 6 is a urea mixing structure; 7 is a sensor mounting seat; 8 is a primary catalytic converter; 9 is a second expansion chamber; 10 is a two-stage catalytic converter; 11 is a third expansion chamber; 12 is a first separator; 13 is a fourth expansion chamber; 14 is a second separator; 15 is a resonant cavity; 16 is a rear end cover; 17 is an air outlet pipe; 18 is a resonance tube; 19 is a perforated short tube; 20 is a muffler shell; 6-1 is a front support plate; 6-2 is a perforated thick round tube; 6-3 is a rear supporting plate; 19-1 is a short tube perforation section; 19-2 is an end cover; 17-1 is a perforated straight pipe section; 17-2 is a resistive packet; 17-3 are curved pipe sections.
Detailed description of the preferred embodiments
Specific embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in fig. 1, the integrated exhaust purifying muffler of the present invention is shown. The invention mainly comprises a flange (1), a silencer shell (20), a front end cover (4), a rear end cover (16), an air inlet pipe (2), an air outlet pipe (17), a urea nozzle (3), a sensor mounting seat (7), a urea mixing structure (6), a first partition plate (12), a second partition plate (14), a primary catalytic converter (8), a secondary catalytic converter (10), a perforated short pipe (19) and a resonance pipe (18). The flange (1) is welded with the front end of the air inlet pipe (2) and is used for connecting the exhaust muffler with the exhaust pipe; the muffler shell (20), the front end cover (4) and the rear end cover (16) form the outer boundary of the muffler to determine the total volume of the muffler; the air inlet pipe (2) and the urea nozzle (3) are welded on the front end cover; the sensor mounting seat (7) is welded at a proper position on the muffler shell (20) and is used for mounting a detection sensor of the aftertreatment system and feeding back an exhaust state signal; the front end of the primary catalytic converter (8), the front end cover (4) and the muffler shell (20) form a first expansion cavity (5); the urea mixing structure (6) is positioned in the first expansion cavity (5) and is used for disturbing the air flow sprayed into the cavity through the air inlet pipe (2), so that urea spray and the air flow are uniformly mixed, and the conversion efficiency of tail gas is improved; the first catalytic converter (8) and the second catalytic converter (10) are separated by a certain distance to form a second expansion cavity (9); the rear end face of the secondary catalytic converter (10), the first partition board (12) and the muffler shell (20) form a third expansion cavity (11); the first partition plate (12), the second partition plate (14) and the muffler shell (20) form a fourth expansion cavity (13); the perforated short pipe (19) is welded and fixed on the first partition board (12) and the second partition board (14) and is used for communicating the third expansion cavity (11) and the fourth expansion cavity (13); the second partition plate (14), the rear end cover (16) and the muffler shell (20) form a resonant cavity (15); the resonance tube (18) is welded and fixed on the first partition board (12) and the second partition board (14) and communicated with the third expansion cavity (11) and the resonance cavity (15); the air outlet pipe (17) is welded and fixed on the second partition plate (14) and the rear end cover (16) and communicated with the fourth expansion cavity (13) and the external atmosphere.
As shown in fig. 2, a urea mixing structure (6) of the integrated exhaust purifying muffler of the present invention is shown. The urea mixing structure (6) consists of a front supporting plate (6-1), a perforated rough pipe (6-2) and a rear supporting plate (6-3). Wherein the front supporting plate (6-1) and the rear supporting plate (6-2) are welded at two ends of the perforated rough circular tube (6-2) and are welded and fixed with the muffler shell (20) for supporting the whole urea mixing structure (6); the front supporting plate (6-1) is an annular plate, and the perforations are concentrated on one side of the ring; the perforated rough round tube (6-2) is of a full perforated structure; the rear supporting plate (6-3) is of a circular plate structure, the area opposite to the perforated thick circular tube (6-2) is of a small-diameter dense perforated structure, and the other annular areas are of a large-diameter thin perforated structure; the urea mixing structure (6) is designed into the structural form, so that the exhaust air flow and urea spray are fully mixed in the first expansion cavity (5), urea crystallization is reduced, and the conversion efficiency of pollutants in tail gas is improved.
As shown in fig. 3, a perforated pipe nipple (19) of the integrated exhaust purifying muffler of the present invention. The perforated short pipe (19) is composed of a short pipe perforated section (19-1) and an end cover (19-2); the exhaust purification muffler is composed of two perforated short pipes (19) with the same structure, the central axes of the muffler are symmetrically distributed, the rear ends of the perforated short pipes (19) are sealed by end covers (19-2), and air flow of the third expansion cavity (11) flows into the fourth expansion cavity (13) through perforations on the perforated section (19-1) of the short pipes.
As shown in fig. 4, a resonance tube (18) of the integrated exhaust purifying muffler of the present invention. The resonance tube (18) is bent to 90 degrees, and the bent part is positioned in the resonance cavity (15), so that low-frequency order noise can be effectively controlled.
As shown in fig. 5, an outlet pipe (17) of the integrated exhaust purifying muffler of the present invention is shown. The front half part of the air outlet pipe (17) is a perforated straight pipe section (17-1), and the outer side of the perforated straight pipe section (17-1) is wrapped with a resistive bag (17-2) for sound absorption; the rear half part of the air outlet pipe is a bent pipe section (17-3) which is bent at a certain angle to discharge the exhaust air to the rear lower part.
As shown in fig. 6, a graph of transmission loss versus frequency for one embodiment of the present invention is shown. The silencer structure of the invention has larger silencing capacity in the middle and low frequency bands, thereby better controlling low frequency noise and improving the sound quality of exhaust noise.
The working principle of the integrated exhaust purifying muffler of the present invention is described in detail below with reference to fig. 1 to 6 and specific embodiments.
The integrated exhaust purification muffler is connected with an exhaust pipe through a flange (1), diesel engine exhaust flows into a first expansion cavity (5) through an air inlet pipe (2) with the diameter of 77mm, the length of the first expansion cavity (5) is 265mm, and the diameter is 205mm of a muffler shell (20); the urea nozzle (3) is welded on the front end cover (4) and forms a 15-degree included angle with the air inlet pipe (2) so that sprayed urea spray meets air inlet flow and then flows into the urea mixing structure (6), and the urea spray and the exhaust flow are fully and uniformly mixed through the turbulence effect of the perforations on the perforated rough round pipe (6-2) and the rear supporting plate (6-3), so that a foundation is laid for the subsequent full catalytic conversion of exhaust pollutants. The mixed exhaust gas flow then flows into the primary catalytic converter (8) to perform catalytic decomposition of exhaust pollutants, while high-frequency noise in a portion of the exhaust gas flow can be reduced. The first catalytic converter (8) and the second catalytic converter (10) are separated by 20mm to form a second expansion cavity (9) with small volume, and certain silencing effect can be generated when airflow flows through the cavity. The mixed air flows into the two-stage catalytic converter (10) to continuously carry out catalytic decomposition of exhaust pollutants, and the exhaust gas after the two-stage catalytic conversion reaches the national exhaust emission standard requirement. Meanwhile, the detection sensors arranged on the sensor mounting seats (7) at the two sides of the catalytic converter can sense the change of the content of specific components of the exhaust gas and feed back related signals for controlling the front-end urea injection quantity, so that the optimal emission control can be achieved under any working condition.
The purified exhaust air flow flows into the third expansion cavity (11), the cavity length is 42mm, and the exhaust air flow flows into the fourth expansion cavity (13) through the perforation with the diameter of 4mm on the perforation short pipe (19), and the middle-low frequency exhaust noise can be effectively attenuated through two expansion processes in the process; meanwhile, the resonance tube (18) and the resonance cavity (15) form a Helmholtz resonator, and the resonance tube (18) has a length increased due to a bending structure, and the cavity length of the resonance cavity (15) is 155mm and has a large volume, so that the resonance tube has a good control effect on low-frequency order noise.
The exhaust air flow flows into the air outlet pipe (17) from the fourth expansion cavity (13), and the perforated straight pipe section (17-1) of the air outlet pipe (17) and the resistive bag (17-2) are mutually matched to form a resistive silencing structure, so that middle-high frequency band noise in exhaust noise can be effectively eliminated; finally, the exhaust air flow is discharged into the atmosphere through the bent pipe section (17-3).
When the exhaust air flow passes through the structure, the exhaust pollutants are eliminated through catalytic conversion, and the exhaust noise is eliminated through the expansion, resonance and resistance structure, so that the exhaust can finally meet the national current-stage emission regulation requirement, the exhaust noise can be effectively controlled, and the effect of improving the exhaust sound quality is achieved.
The present invention has been described in detail with the purpose of enabling those skilled in the art to understand and practice the present invention, but not to limit the scope of the present invention, and the present invention is not limited to the above-described embodiments, and all equivalent changes or modifications according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (4)
1. An integrated exhaust purifying muffler for improving sound quality, characterized by: the silencer comprises a flange, an air inlet pipe, a silencer shell, a front end cover, a rear end cover, an air outlet pipe, a urea nozzle, a urea mixing structure, a first partition plate, a second partition plate, a first catalytic converter, a second catalytic converter, a perforated short pipe and a resonance pipe; the flange is welded with the front end of the air inlet pipe and is used for connecting the exhaust purification muffler with the exhaust pipe; the muffler shell, the front end cover and the rear end cover form the outer boundary of the muffler to determine the total volume of the muffler; the air inlet pipe and the urea nozzle are welded on the front end cover; the front end of the primary catalytic converter, the front end cover and the muffler shell form a first expansion cavity; the urea mixing structure is positioned in the first expansion cavity and is used for disturbing the airflow sprayed into the cavity through the air inlet pipe, so that urea spray and the airflow are uniformly mixed, and the conversion efficiency of tail gas is improved; the first catalytic converter and the second catalytic converter are separated by a certain distance to form a second expansion cavity; the rear end face of the secondary catalytic converter, the first partition plate and the muffler shell form a third expansion cavity; the first partition plate, the second partition plate and the muffler shell form a fourth expansion cavity; the perforated short pipe is welded and fixed on the first partition board and the second partition board and is used for communicating the third expansion cavity and the fourth expansion cavity; the second partition plate, the rear end cover and the muffler shell form a resonant cavity; the resonance tube is welded and fixed on the first partition board and the second partition board and is communicated with the third expansion cavity and the resonance cavity; the air outlet pipe is welded and fixed on the second partition plate and the rear end cover and communicated with the fourth expansion cavity and the external atmosphere; the resonance tube is bent to 90 degrees, and the bent part is positioned in the resonance cavity; the front half part of the air outlet pipe is a perforated straight pipe section, and the outer side of the perforated straight pipe section is wrapped with a resistive bag for sound absorption; the rear half part of the air outlet pipe is a bent pipe section which is bent by a certain angle, so that the exhaust air is discharged to the rear lower part.
2. The integrated exhaust gas purifying muffler for improving sound quality according to claim 1, wherein: the exhaust purification muffler further comprises a sensor mounting seat, wherein the sensor mounting seat is welded with the muffler shell and is used for mounting a detection sensor of the aftertreatment system and feeding back an exhaust state signal.
3. The integrated exhaust gas purifying muffler for improving sound quality according to claim 1, wherein: the urea mixing structure consists of a front supporting plate, a rear supporting plate and a perforated thick circular tube; the front support plate and the rear support plate are welded at two ends of the perforated thick circular tube and are fixedly welded with the muffler shell, and are used for supporting the whole urea mixing structure.
4. The integrated exhaust gas purifying muffler for improving sound quality according to claim 1, wherein: the perforated short pipe is composed of two short pipes with the same structure, the central axes of the muffler are symmetrically distributed, and the rear end of the perforated short pipe is sealed by an end cover, so that air flow of the third expansion cavity flows into the fourth expansion cavity through the perforations on the perforated section of the short pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711198418.8A CN107701264B (en) | 2017-11-25 | 2017-11-25 | Integrated exhaust purification muffler for improving sound quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711198418.8A CN107701264B (en) | 2017-11-25 | 2017-11-25 | Integrated exhaust purification muffler for improving sound quality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107701264A CN107701264A (en) | 2018-02-16 |
| CN107701264B true CN107701264B (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711198418.8A Active CN107701264B (en) | 2017-11-25 | 2017-11-25 | Integrated exhaust purification muffler for improving sound quality |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108952914A (en) * | 2018-06-22 | 2018-12-07 | 力帆实业(集团)股份有限公司 | Exhaust system for motorcycle |
| CN108894859B (en) * | 2018-07-25 | 2023-10-24 | 一汽解放汽车有限公司 | Post-processor assembly of cylindrical integrated detachable urea nozzle |
| CN109826699A (en) * | 2019-02-28 | 2019-05-31 | 武汉理工大学 | A kind of exhaust system applied to electrothermic type hybrid vehicle |
| CN116480439B (en) * | 2023-06-16 | 2023-08-29 | 华东交通大学 | Integrated exhaust purification muffler |
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|---|---|---|---|---|
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