CN203570390U - Integrated type SCR box sound attenuation unit - Google Patents

Integrated type SCR box sound attenuation unit Download PDF

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Publication number
CN203570390U
CN203570390U CN201320640854.7U CN201320640854U CN203570390U CN 203570390 U CN203570390 U CN 203570390U CN 201320640854 U CN201320640854 U CN 201320640854U CN 203570390 U CN203570390 U CN 203570390U
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CN
China
Prior art keywords
perforated plate
cavity
perforated
outlet pipe
chamber
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Active
Application number
CN201320640854.7U
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Chinese (zh)
Inventor
张中业
翟旭茂
史美丽
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Priority to CN201320640854.7U priority Critical patent/CN203570390U/en
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Abstract

The utility model discloses an integrated type SCR box sound attenuation unit which comprises a barrel body. The front end of the barrel body is provided with an air inlet pipe, the back end of the barrel body is provided with an air outlet pipe, a front perforated plate and a back perforated plate are arranged in the barrel body, the barrel body is sequentially divided by the front perforated plate and the back perforated plate into an expansion cavity, a tail cavity and a perforated cavity, a hollow throat pipe for being communicated with the expansion cavity and the tail cavity is arranged on the upper portion of the front perforated plate, the air outlet pipe penetrates through the perforated cavity and the back perforated plate to enter the tail cavity, through holes are formed in the parts, located in the perforated cavity and the tail cavity, of the air outlet pipe, the cross sections of the pipes are suddenly changed through the expansion cavity, the tail cavity and the perforated cavity to cause sound impedance changes to enable part of sound waves transmitted along the pipes to be reflected to a sound source, transmitted sound energy is reduced, and the low-frequency acoustical performance is improved. A double-throat-pipe structure is adopted, so that the air flowing area is large, the air resistance is small, caused pressure losses are relatively fewer, and the exhaust back pressure can be effectively reduced. The air outlet pipe is of a reed pipe structure, and high-frequency noise and regenerative noise are reduced.

Description

Integrated form SCR case silencer element
Technical field
The utility model relates to a kind of integrated form SCR case silencer element.
Background technique
Increasingly stringent along with Abgasgesetz, Diesel Engine After-treatment Technology urea selective catalytic reduction worldwide obtains applying more and more widely, diesel engine urea-SCR system need to add SCR catalytic converter in original diesel engine exhaust system, the general integrated form SCR box-shaped formula that SCR catalytic converter and diesel engine exhaust muffler are integrated that adopts in actual applications, in existing SCR silencing apparatus, SCR casing body is because the reason of carrier makes diesel exhaust gas back pressure larger, and then power loss is increased, for diesel engine power loss ratio and exhaust back pressure are reduced, often sacrifice its acoustical behavior, make insertion loss not reach designing requirement, SCR silencing apparatus acoustical behavior is poor, in addition, the air displacement of motor mainly concentrates on low, Mid Frequency, and high band also has higher energy, in limited silencing apparatus space range, can not be low again, in, in high wide frequency range, obtain good soundproof effect.
What China's diesel exhaust gas was eliminated the noise main employing at present is the anti-silencing apparatus that perforated pipe adds expansion chamber various combination, the problem that ubiquity acoustic attenuation performance is poor, exhaust resistance is large, especially relative less with pressure loss comprehensive study work to integrated form SCR case acoustical behavior, when development and Design integrated form SCR case, do not consider noise elimination effect, the vent systems pressure loss and the performance impact to SCR system thereof of silencing apparatus, cause SCR case noise reduction level not meet design needs.
Model utility content
The technical problems to be solved in the utility model is for above-mentioned defect, and a kind of integrated form SCR case silencer element that can effectively reduce exhaust back pressure loss, good muffling effect is provided.
In order to solve the problems of the technologies described above, the utility model comprises that front end is provided with the cylindrical shell that suction tude, rear end are provided with steam outlet pipe, in described cylindrical shell, be provided with front perforated plate and rear perforated plate, front perforated plate and rear perforated plate are separated into expansion cavity, last chamber and perforated chamber successively by cylindrical shell, its structural feature is that the top of described front perforated plate is provided with the trunnion that is communicated with expansion cavity and last chamber, described trunnion is at least one, described steam outlet pipe enters last chamber through perforated chamber and rear perforated plate, and the part that described steam outlet pipe is positioned at perforated chamber and last chamber is evenly equipped with through hole.
Described front perforated plate top is interval with two trunnions that be arranged in parallel.
The end that described steam outlet pipe is positioned at last chamber is provided with flow-guiding mouth.
Described steam outlet pipe is that reed is not managed.
Described front perforated plate is doubling plate, has clamped acoustical cotton between two-ply.
In described perforated chamber, be filled with silencing cotton.
Adopt the integrated form SCR case silencer element of such scheme compared with prior art to have the following advantages: for the utility model, expansion cavity, last chamber and perforated chamber make the abrupt change of cross-section of pipeline cause that acoustic impedance changes, make a part along the acoustic reflection echogenicity of pipe transmmision, transmission acoustic energy reduces, and improves its frequency acoustic performance; Adopt two throat tubular constructions to make gas flow area large, resistance of air is little, and the pressure loss causing is relatively little, can effectively reduce exhaust back pressure; Steam outlet pipe adopts not tubular construction of reed, reduces high-frequency noise and regenerated noise; Consider temperature and the acoustically effective of outlet pipe, select resistant to elevated temperatures super glass wool as sound-absorbing material, this material can at high temperature normally be worked, and soundproof effect is good; Fill silencing cotton in perforated chamber, can increase thickness and the density of muffler material, in raising, the soundproof effect of low frequency; The silencing cotton clamping in front perforated plate is thinner, can prevent from forming larger exhaust back pressure, the silencing cotton adopting in perforated chamber is thicker, both can make compact structure, the weight saving of whole silencing apparatus, good soundproof effect can be obtained again, and larger exhaust back pressure can not be produced.And the utility model is simple in structure, easy to use, excellent noise reduction effect.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail:
Fig. 1 is structural representation of the present utility model;
Fig. 2 be in Fig. 1 A-A to sectional view.
Embodiment
As depicted in figs. 1 and 2, this integrated form SCR case silencer element comprises that front end is provided with suction tude, rear end is provided with the cylindrical shell 1 of steam outlet pipe 14, in cylindrical shell 1, be provided with front perforated plate 13 and rear perforated plate 11, front perforated plate 13 and rear perforated plate 11 are separated into expansion cavity 3 successively by cylindrical shell 1, chamber 12, end and perforated chamber 8, the top of front perforated plate 13 is provided with the trunnion 5 that is communicated with expansion cavity 3 and last chamber 12, trunnion 5 is at least one, before in the present embodiment, perforated plate 13 tops are interval with two trunnions that be arranged in parallel 5, two trunnions 5 make gas flow area large, resistance of air is little, the pressure loss causing is relatively little, can effectively reduce exhaust back pressure.Steam outlet pipe 14 enters last chamber 12 through perforated chamber 8 and rear perforated plate 11, and the part that steam outlet pipe 14 is positioned at perforated chamber 8 and last chamber 12 is evenly equipped with through hole 9.Through hole 9 can reduce high-frequency air flow regenerated noise composition.In perforated chamber 8 between rear perforated plate 11 and cylindrical shell 1 end wall, be filled with silencing cotton 10, silencing cotton 10 is thicker, both can make compact structure, the weight saving of whole silencing apparatus, can obtain good soundproof effect again, and can not produce larger exhaust back pressure.The end that steam outlet pipe 14 is positioned at last chamber 12 is provided with flow-guiding mouth 7, and flow-guiding mouth 7 can reduce regenerated noise.Front perforated plate 13 inner clips are equipped with acoustical cotton 6, and front perforated plate 13 is comprised of two boards, are evenly equipped with respectively through hole on two boards, and acoustical cotton 6 is contained between two plates, and rear perforated plate 11 is veneer, and is evenly equipped with through hole on plate face.In the present embodiment, steam outlet pipe 14 is not managed for reed, and reed is not managed the concentric tube that is provided with through hole for middle part.
In the present embodiment, acoustical cotton is elected super glass wool as, and super glass wool can normally be worked under the high temperature of 1000 ℃, and good muffling effect.
The utility model is to use like this: air-flow enters expansion cavity 3 by suction tude, the noise reduction of resonating, most of air-flow after resonance noise reduction enters last chamber 12 by two trunnions 5, two trunnions 5 effectively reduce the pressure loss, increase airflow area, fraction air-flow enters last chamber 12 through front perforated plate 13 and silencing cotton 13, the porosity of perforated plate 13 is high, aperture is little, by acoustic reflection and friction, can effectively reduce high frequency sound wave energy, chamber 12, end facilitates low-frequency sound wave reflection and medium-high frequency sound wave to mix, an air-flow part in chamber 12, end enters perforated chamber 8 by rear perforated plate 11, and carry out noise reduction by 10 pairs of high-frequency noises of the silencing cotton in perforated chamber 8 and regenerated noise, air-flow is entered steam outlet pipe 14 and is discharged by the through hole 9 on steam outlet pipe 14 after silencing cotton 10 noise reductions, air-flow another part in chamber 12, end enters steam outlet pipe 14 by the through hole 9 on flow-guiding mouth 7 and steam outlet pipe 14, the air-flow part entering after steam outlet pipe 14 is directly discharged, another part is discharged after entering silencing cotton 10 noise reductions by through hole 9.
The utility model is not limited to above-mentioned embodiment, and those skilled in the art, not departing under the prerequisite of spirit and scope of the present utility model, can do some changes and modification.Protection domain of the present utility model should be as the criterion with claim of the present utility model.

Claims (6)

1. an integrated form SCR case silencer element, comprise that front end is provided with suction tude, rear end is provided with the cylindrical shell (1) of steam outlet pipe (14), in described cylindrical shell (1), be provided with front perforated plate (13) and rear perforated plate (11), front perforated plate (13) and rear perforated plate (11) are separated into expansion cavity (3) successively by cylindrical shell (1), chamber (12), end and perforated chamber (8), the top that it is characterized in that described front perforated plate (13) is provided with the trunnion (5) that is communicated with expansion cavity (3) and last chamber (12), described trunnion (5) is at least one, described steam outlet pipe (14) enters last chamber (12) through perforated chamber (8) and rear perforated plate (11), the part that described steam outlet pipe (14) is positioned at perforated chamber (8) and last chamber (12) is evenly equipped with through hole (9).
2. integrated form SCR case silencer element according to claim 1, is characterized in that described front perforated plate (13) top is interval with two trunnions that be arranged in parallel (5).
3. according to the integrated form SCR case silencer element described in any one in claim 1-2, it is characterized in that the end that described steam outlet pipe (14) is positioned at last chamber (12) is provided with flow-guiding mouth (7).
4. integrated form SCR case silencer element according to claim 1, is characterized in that described steam outlet pipe (14) not manages for reed.
5. integrated form SCR case silencer element according to claim 1, is characterized in that described front perforated plate (13) is doubling plate, has clamped acoustical cotton (6) between two-ply.
6. integrated form SCR case silencer element according to claim 1, is characterized in that being filled with in described perforated chamber (8) silencing cotton (10).
CN201320640854.7U 2013-10-17 2013-10-17 Integrated type SCR box sound attenuation unit Active CN203570390U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320640854.7U CN203570390U (en) 2013-10-17 2013-10-17 Integrated type SCR box sound attenuation unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320640854.7U CN203570390U (en) 2013-10-17 2013-10-17 Integrated type SCR box sound attenuation unit

Publications (1)

Publication Number Publication Date
CN203570390U true CN203570390U (en) 2014-04-30

Family

ID=50538124

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320640854.7U Active CN203570390U (en) 2013-10-17 2013-10-17 Integrated type SCR box sound attenuation unit

Country Status (1)

Country Link
CN (1) CN203570390U (en)

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