CN209724449U - Noise wideband processing unit - Google Patents

Abstract

The utility model relates to a kind of noise wideband processing unit, including shell, air inlet pipe and exhaust pipe, relatively independent the first cavity and the second cavity are formed in the shell；The exhaust pipe is two and respectively corresponds and be connected to first cavity and the second cavity, and the air inlet pipe is connected to the first cavity or the second cavity；Communicating passage is equipped between first cavity and the second cavity；The noise wideband processing unit has double-exhaust channel, airflow channel has dual path, it can be under the premise of not sacrificing power performance, pass through a variety of noise reduction modes of expanding, reflect and interfere and resonate, it is designed in conjunction with each pipe fitting and cavity body structure, realize the elimination to Kuanping Terrane, more effectively reduction exhaust noise；The composition for generating half order in exhaust noise can be made by the appropriate adjusting to two-way electrical path length simultaneously, allow the exhaust sound of single cylinder engine to generate the effect of twin-tub machine, effectively improve the exhaust sound quality of motorcycle；The noise wideband processing unit compact layout, easy processing manufacture.

Description

Noise wideband processing unit

Technical field

The utility model relates to a kind of noise treatment device more particularly to a kind of noise wideband processing units.

Background technique

Muffler is a kind of device that can be hindered sound transmission and air-flow is allowed to pass through, and is to reduce internal combustion engine exhaust noise Important component, the quality of performance directly affect the size of engine noise, and the power loss to engine, oil consumption, torque Etc. performances have larger impact.Wherein, expansion chamber muffler because structure it is simple, noise reduction bandwidth, sound-damping qualities are high, easy to process Manufacture is widely used in the exhaust noise control of motorcycle.

In the prior art, the acoustic wave filter structure that motorcycle generallys use include shell, resonator, tail pipe, from the front to the back according to Secondary to be set to the intracorporal chamber of shell, two chambers and three chambers, the exhaust gas of engine discharge is usually to first pass through a chamber to turn back again to two chambers One chamber is finally discharged via three chambers；The muffler structure of the above structure of multi-cavity structure especially three chambers is complicated, and vapour lock increases, and moves Power loss increases, and there are the bad problems of acoustic damping characteristic of certain middle low frequencies；And single-chamber muffler is primarily present certain frequencies Acoustic damping characteristic is poor, high frequency sound-damping qualities very minor issue.

Based on problem above, the utility model provides a kind of noise wideband processing unit.Noise wideband processing unit tool There is double-exhaust channel, airflow channel has dual path, can be under the premise of not sacrificing power performance, by expanding, reflecting and interfere And resonance various ways, Kuanping Terrane is eliminated in conjunction with each pipe fitting and cavity body structure design, effectively reduces exhaust noise；Meanwhile It can make to generate half order ingredient in exhaust noise by suitably adjusting two-way electrical path length, the exhaust sound of single cylinder engine is allowed to generate twin-tub The effect of machine effectively improves the exhaust sound quality of motorcycle, and compact-sized, easy to process.

Utility model content

In view of this, the present invention provides a kind of noise wideband processing units, have double-exhaust channel, airflow channel tool There is dual path, it can be under the premise of not sacrificing power performance, by expanding, reflecting and interfere and the various ways that resonate, in conjunction with each pipe Kuanping Terrane is eliminated in part and cavity body structure design, effectively reduces exhaust noise；Meanwhile it can by suitably adjusting two-way electrical path length Make to generate half order ingredient in exhaust noise, allows the exhaust sound of single cylinder engine to generate the effect of twin-tub machine, effectively improve motorcycle Exhaust sound quality, and it is compact-sized, it is easy to process.

The noise wideband processing unit of the utility model, including shell, air inlet pipe and exhaust pipe, the shell is interior to form phase To independent first cavity and the second cavity；The exhaust pipe is two and respectively corresponds and be connected to first cavity and second Cavity, the air inlet pipe are connected to the first cavity or the second cavity；It is logical that connection is equipped between first cavity and the second cavity Road；The noise wideband processing unit is after silencer, and front end is connected with preceding muffler, air-flow via preceding muffler exhaust Pipe enter the noise wideband processing unit air inlet pipe, into the second cavity pneumatic noise it is stretched, reflection with interference noise reduction After processing, a part is discharged via the exhaust pipe of the second cavity, and another part enters the first cavity via communicating passage and is total to It is discharged after vibration noise reduction and further expansion, reflection and interference noise reduction processing；Wideband herein refers to wide frequency range；Herein Expansion, reflection and interference noise reduction refer to that the pneumatic noise sound wave into explosion after more large cavity is encountered on cavity wall and tube wall When can generate reflection, when between back wave and pneumatic noise sound wave formed phase difference especially form 180 ° of phase difference when can generate Interfere and cancels out each other；Resonance noise reduction herein refers to can generate when the frequency of air-flow sound wave is identical as the intrinsic frequency of cavity Covibration, conducive to the elimination of low frequency noise, at this moment amplitude is maximum, and friction loss is maximum, and sound deadening capacity is also maximum；The noise wideband There is processing unit Dual gas flow diameter and double-exhaust port to design, and topology layout is compact, conducive to the noise level of air-flow is being improved Meanwhile increasing air-flow process, increase the energy and fricting resistance loss of air-flow, the especially design of the second airflow channel, is conducive to The acoustical behavior for improving high frequency treatment improves the drag characteristic of muffler, reduces power loss；The noise wideband processing unit is The material selection of metal material, such as carbon steel or stainless steel, muffler belongs to the prior art, and details are not described herein；The noise The connection of each component of wideband processing unit belongs to the prior art, such as welding, and details are not described herein.

Further, second cavity is relative to the first cavity along discharge directions arranged in parallel；The outlet of the air inlet pipe Mouth is located in the second cavity；

Further, the exhaust pipe includes exhaust pipe I and exhaust pipe II；The exhaust pipe I is connected to the second cavity, described Exhaust pipe II passes through the second cavity and is connected to the first cavity；The air inlet pipe passes through the first cavity and is connected to the second cavity；It is described Between first cavity and the second cavity by partition divide and it is relatively independent, be provided with across partition and be used to form communicating passage Communicating pipe；First cavity is connected to the second cavity by communicating pipe；The air inlet pipe connects via the second cavity and exhaust pipe I Logical to constitute the first airflow channel, the air inlet pipe is successively connected to via the second cavity, communicating pipe and the first cavity with exhaust pipe II Constitute the second airflow channel；The Position Design of the air inlet pipe, communicating pipe and exhaust pipe II is advisable in favor of feasible process；It is preferred that The air inlet pipe and exhaust pipe II are set to communicating pipe two sides, conducive to the air-flow after the interference noise reduction of the second cavity is entered by air inlet pipe By communicating pipe enter the first cavity before will not too much by exhaust pipe II barrier, conducive to second channel gas circulate, Conducive to the drag characteristic and power loss for guaranteeing muffler；It is preferred that the exhaust pipe I with respect to exhaust pipe II closer to air inlet pipe side, Barrier that will not too much by exhaust pipe II when being discharged conducive to the intracorporal air-flow of the second chamber via exhaust pipe I, it is logical to be conducive to first The gas in road circulates, and is further conducive to guarantee the drag characteristic and power loss of muffler；

Further, the cross section of the shell is round or oval, preferably circular；

Further, the air inlet pipe is 1:4 to 1 in the ratio between the interpolation length of the second cavity and the second cavity axial length: 10, preferably 1:4；Interpolation pipe structure can improve in low frequency noise acoustic characteristics；Sound of the noise air-flow along air-flow direction of advance It forms phase difference between back wave on wave and internal chamber wall and tube wall to generate interference and cancel out each other, especially when air inlet pipe is second When the interpolation length of cavity is the second cavity axial length a quarter, pass through frequency conducive to elimination even-multiple wavelength；Due to Noise air-flow explosion after entering the second bigger cavity of radial section product, causes portion gas to expand rapidly in inner radial It dissipates and collision, air inlet pipe interpolation length is shorter at this time, and the second cavity axial length is bigger, is more conducive to the diffusion of gas and touches It hits, is particularly advantageous for certain in the energy and fricting resistance loss for increasing air-flow to a certain degree conducive to the elimination of broadband noise The elimination of middle low frequency and high frequency noise；The ratio between cross-sectional area and the cross-sectional area of air inlet pipe of second cavity are greater than 5, preferably It is 6.25；The ratio between second cavity cross-sectional area and air inlet pipe cross-sectional area herein are divergence ratio, and divergence ratio increase is conducive to gas The reflection and interference for flowing sound wave are offset, and sound-damping qualities are improved, and divergence ratio can be obtained apparent sound-damping qualities and be conducive to air-flow when being greater than 5 Drag characteristic；The transverse direction refers to perpendicular to air inlet pipe axially direction；

Further, the communicating pipe is 1:2 to 1 in the ratio between the interpolation length of the first cavity and the first cavity axial length: 5, preferably 1:4；The communicating pipe is 1:2 to 1:5 in the ratio between the interpolation length of the second cavity and the second cavity axial length, excellent It is selected as 1:4；The further reflection and interference absorption of the pneumatic noise that do not eliminate in more conducively the second cavity in the first cavity, increase Add the noise elimination amount of corresponding frequencies；It is conducive to adjust the process of air-flow simultaneously, increases the fricting resistance loss of air-flow, be conducive to eliminate High frequency treatment noise；The cross-sectional area of communicating pipe designs premised on it is with air inlet pipe and the layout feasible process of exhaust pipe II i.e. It can；The transverse direction refers to perpendicular to communicating pipe axially direction；

Further, the ratio between the exhaust pipe I interpolation length and the second cavity axial length are 1:2 to 1:3；It is preferred that 2:5；It should Under optimal proportion, it is more conducive to flow through the elimination of the noise of wider frequency range in the air-flow sound wave of first passage, reduces exhaust Noise throughput in pipe I；It is preferred that length of the exhaust pipe I outside shell is the half of the interpolation length of exhaust pipe I, it is further sharp In the elimination of air-flow sonic noise and the compact-sized layout of muffler；

Further, the exhaust pipe II the ratio between the interpolation length of the first cavity and the first cavity axial length be 1:7 extremely 1:10, preferably 1:8.5；The postposition interpolation method of exhaust pipe is not likely to produce dead space, conducive to the first cavity interior air-flow noise It further eliminates, reduces the noise throughput in exhaust pipe II, since sound wave can't pass muffler, biography is not gone out, to reach To noise reduction purpose；The cross-sectional area of the exhaust pipe II designs premised on it is with air inlet pipe and the layout feasible process of communicating pipe ；

Further, the exhaust pipe I and the equal reduced pipe of exhaust pipe II, the Large Diameter Pipeline part of the reduced pipe is prolonged inwardly It stretches, tubule path portion passes outwards through the second cavity tail end cover, and the tubule path portion passes through smooth loudspeaker to Large Diameter Pipeline part Mouth forms transition, and the reducing ratio of exhaust pipe I and exhaust pipe II is 0.7 to 0.8, and preferably 0.78；Bell shape Smooth transition design, conducive to guiding air-flow and keeping air-flow more smooth in the flowing of pipeline；The reducing of exhaust pipe I and exhaust pipe II Than the diameter proportion for reduced pipe small-and-middle diameter with major diameter, when reducing ratio is 0.78, more conducively reduction resistance make smooth gas discharge and Reduce pneumatic noise；

Further, the exhaust pipe I is transversely arranged in a staggered manner with air inlet pipe, and the spacing that is staggered accounts for the second cavity and is staggered at this 0.2 to 0.3 of lateral dimension on direction, preferably 0.25；It is more conducive to improve the transmitting loss of muffler high frequency under the optimal proportion And further it is conducive to the elimination of Kuanping Terrane；The axial line spacing that distance is exhaust pipe I and air inlet pipe that is staggered；Work as exhaust pipe I and when the not parallel axial line of air inlet pipe, the more conducively elimination to high frequency treatment noise.

The beneficial effects of the utility model are: the noise wideband processing unit of the utility model has double-exhaust channel, gas Circulation road has dual path, can be under the premise of not sacrificing power performance, by expanding, reflecting and interference noise reduction and resonance noise reduction Various ways are designed in conjunction with each pipe fitting and cavity body structure, realize the elimination to Kuanping Terrane, more effectively reduction exhaust noise； The composition of half order can be made to generate in exhaust noise by appropriate adjust to two-way electrical path length simultaneously, allow the exhaust of single cylinder engine Sound generates the effect of twin-tub machine, effectively improves the exhaust sound quality of motorcycle；The noise wideband processing unit compact layout, easily Processing and manufacturing.

Detailed description of the invention

The utility model is further described with reference to the accompanying drawings and examples:

Fig. 1 is the perspective structure schematic diagram of the utility model.

In Fig. 1,1- shell, the first cavity of 2-, the second cavity of 3-, 4- air inlet pipe, 5- communicating pipe, 6- exhaust pipe, 7- exhaust Pipe.

Specific embodiment

Fig. 1 is the perspective structure schematic diagram of the utility model, as shown in the figure: a kind of noise wideband of the present embodiment handles dress It sets, including shell 1, air inlet pipe 4 and exhaust pipe, forms relatively independent the first cavity 2 and the second cavity 3 in the shell 1；Institute Exhaust pipe is stated as two and is respectively corresponded and is connected to first cavity 2 and the second cavity 3, the air inlet pipe 4 is connected to first Cavity 2 or the second cavity 3；Communicating passage is equipped between first cavity 2 and the second cavity 3；The noise wideband processing dress It is set to after silencer, front end is connected with preceding muffler, and air-flow is handled via the exhaust pipe of preceding muffler into the noise wideband The air inlet pipe 4 of device, into the second cavity 3 pneumatic noise is stretched, reflection is with after interference noise reduction processing, a part is via the The exhaust pipe of two cavitys 3 is discharged, and another part enters the first cavity 2 via communicating passage and carries out resonance noise reduction and further expansion It is discharged after opening, reflecting and interfering noise reduction processing；Wideband herein refers to wide frequency range；Expansion, reflection and interference herein disappears Sound refers to that the pneumatic noise sound wave into explosion after more large cavity can generate reflection when encountering on cavity wall and tube wall, when anti- Interference can be generated and cancel out each other by being formed when phase difference especially forms 180 ° of phase difference between ejected wave and pneumatic noise sound wave；This The resonance noise reduction at place, which refers to, can generate covibration when the frequency of air-flow sound wave is identical as the intrinsic frequency of cavity, be conducive to low frequency The elimination of noise, at this moment amplitude is maximum, and friction loss is maximum, and sound deadening capacity is also maximum；The noise wideband processing unit has double gas Flow path and double-exhaust port design, topology layout is compact, conducive to while improving the noise level of air-flow, increases air-flow stream Journey increases the energy and fricting resistance loss of air-flow, the especially design of the second airflow channel, conducive to the acoustics for improving high frequency treatment Performance improves the drag characteristic of muffler, reduces power loss；The noise wideband processing unit is metal material, such as carbon steel Or stainless steel etc., the material selection of muffler belong to the prior art, details are not described herein；Each portion of noise wideband processing unit The connection of part belongs to the prior art, such as welding, and details are not described herein.

In the present embodiment, as shown, second cavity 3 is relative to the first cavity 2 along discharge directions arranged in parallel；Institute The gas outlet for stating air inlet pipe 4 is located in the second cavity 3.

In the present embodiment, the exhaust pipe includes exhaust pipe I6 and exhaust pipe II7；As shown, the exhaust pipe I6 connects The second cavity 3 is passed through, the exhaust pipe II7 passes through the second cavity 3 and is connected to the first cavity 2；The air inlet pipe 4 passes through the first chamber Body 2 is connected to the second cavity 3；Between first cavity 2 and the second cavity 3 by partition divide and it is relatively independent, pass through every Plate is provided with the communicating pipe 5 for being used to form communicating passage；First cavity 2 is with the second cavity 3 by being connected to communicating pipe 5；Institute It states air inlet pipe 4 and is connected to the first airflow channel of composition with exhaust pipe I6 via the second cavity 3, the air inlet pipe 4 is successively via second Cavity 3, communicating pipe 5 and the first cavity 2 are connected to exhaust pipe II7 constitutes the second airflow channel；The air inlet pipe 4, communicating pipe 5 and The Position Design of exhaust pipe II7 is advisable in favor of feasible process；It is preferred that the air inlet pipe 4 and exhaust pipe II7 are set to communicating pipe 5 Two sides, being entered conducive to the air-flow entered after the interference noise reduction of the second cavity 3 by air inlet pipe 4 by communicating pipe 5 will not before first cavity 2 Barrier by exhaust pipe II7 too much is circulated conducive to the gas of second channel, conducive to the drag characteristic and function for guaranteeing muffler Rate loss；It is preferred that the exhaust pipe I6 with respect to exhaust pipe II7 closer to 4 side of air inlet pipe, conducive to the air-flow in the second cavity 3 via Barrier that will not too much by exhaust pipe II7 when exhaust pipe I6 discharge is further conducive to conducive to the gas circulation of first passage Guarantee the drag characteristic and power loss of muffler.

In the present embodiment, as shown, the cross section of the shell 1 is circle, first cavity 2 and the second cavity 3 Volumetric ratio be 1:1 to 1:1.5, preferably 1:1.3；When cavity axial length is the quarter-wave odd-multiple of sound wave, In There is preferable erasure effect in these frequencies；By the adjusting to 3 volumetric ratio of the first cavity 2 and the second cavity, especially when this When volumetric ratio is 1:1.3, the resonant frequency of pneumatic noise is more conducively adjusted, realizes the elimination of Kuanping Terrane.

In the present embodiment, the air inlet pipe 4 is in the ratio between interpolation length and 3 axial length of the second cavity of the second cavity 3 1:4 to 1:10, preferably 1:4；Interpolation pipe structure can improve in low frequency noise acoustic characteristics；Noise air-flow is along air-flow advance side To sound wave and internal chamber wall and tube wall on back wave between formed phase difference generate interference and cancel out each other, especially work as air inlet pipe 4 when the interpolation length of the second cavity 3 is 3 axial length a quarter of the second cavity, conducive to passing through for even-multiple wavelength is eliminated Frequency；Since noise air-flow is into explosion after the second bigger cavity 3 of radial section product, cause portion gas in inside Radial diffusion rapidly and collision, 4 interpolation length of air inlet pipe is shorter at this time, and 3 axial length of the second cavity is bigger, is more conducive to gas Diffusion and collision, in the energy and fricting resistance loss for increasing air-flow to a certain degree, conducive to the elimination of broadband noise, especially Its elimination for being conducive to certain middle low frequencies and high frequency noise；The cross-sectional area of second cavity 3 and the cross-sectional area of air inlet pipe 4 it Than being greater than 5, preferably 6.25；The ratio between 3 cross-sectional area of the second cavity and 4 cross-sectional area of air inlet pipe herein are divergence ratio, are expanded It opens and is conducive to the reflection of air-flow sound wave and interferes offset than increasing, improve sound-damping qualities, divergence ratio can be obtained when being greater than 5 significantly to disappear Volume and the drag characteristic for being conducive to air-flow；The transverse direction refers to perpendicular to 4 axially direction of air inlet pipe.

In the present embodiment, the communicating pipe 5 is in the ratio between interpolation length and 2 axial length of the first cavity of the first cavity 2 1:2 to 1:5, preferably 1:4；The communicating pipe 5 is in the ratio between interpolation length and 3 axial length of the second cavity of the second cavity 3 1:2 to 1:5, preferably 1:4；Further reflection of the pneumatic noise that do not eliminated in more conducively the second cavity 3 in the first cavity 2 It is absorbed with interference, increases the noise elimination amount of corresponding frequencies；It is conducive to adjust the process of air-flow simultaneously, increases the frictional resistance of air-flow Loss is conducive to eliminate high frequency treatment noise；The cross-sectional area of communicating pipe 5 is designed with the layout work of itself and air inlet pipe 4 and exhaust pipe II7 Premised on skill is feasible；The transverse direction refers to perpendicular to 5 axially direction of communicating pipe.

In the present embodiment, the ratio between the exhaust pipe I6 interpolation length and 3 axial length of the second cavity are 1:2 to 1:3；It is preferred that 2:5；It under the optimal proportion, is more conducive to flow through the elimination of the noise of wider frequency range in the air-flow sound wave of first passage, drop Noise throughput in low exhaust pipe I6；It is preferred that length of the exhaust pipe I6 outside shell 1 is the one of the interpolation length of exhaust pipe I6 Half, further conducive to the elimination of air-flow sonic noise and the compact-sized layout of muffler.

In the present embodiment, the exhaust pipe II7 is in the ratio between the interpolation length of the first cavity 2 and 2 axial length of the first cavity For 1:7 to 1:10, preferably 1:8.5；The postposition interpolation method of exhaust pipe is not likely to produce dead space, is conducive to gas in the first cavity 2 The further elimination of noise is flowed, the noise throughput reduced in exhaust pipe II7 can not passed since sound wave can't pass muffler It goes, to reach noise reduction purpose；The cross-sectional area of the exhaust pipe II7 is designed with the layout work of itself and air inlet pipe 4 and communicating pipe 5 Premised on skill is feasible.

In the present embodiment, the exhaust pipe I6 and the equal reduced pipe of exhaust pipe II7, as shown, the big pipe of the reduced pipe Path portion extends inwardly, and tubule path portion passes outwards through 3 tail end cover of the second cavity, and the tubule path portion is to Large Diameter Pipeline part By smooth toroidal at transition, and the reducing ratio of exhaust pipe I6 and exhaust pipe II7 is 0.7 to 0.8, preferably 0.78；The smooth transition of bell shape designs, conducive to guiding air-flow and keeping air-flow more smooth in the flowing of pipeline；Exhaust pipe The reducing of I6 and exhaust pipe II7 are more conducive to subtract than the diameter proportion for reduced pipe small-and-middle diameter with major diameter when reducing ratio is 0.78 Slight drag makes smooth gas discharge and reduces pneumatic noise.

In the present embodiment, as shown, the exhaust pipe I6 is transversely arranged in a staggered manner with air inlet pipe 4, and the spacing that is staggered is accounted for Second cavity 3 is staggered 0.2 to 0.3 of the lateral dimension on direction, preferably 0.25 at this；It is more conducive to improve under the optimal proportion to disappear Sound device high frequency transmitting loss and the elimination for being further conducive to Kuanping Terrane；The distance that is staggered is exhaust pipe I6 and air inlet pipe 4 Axial line spacing；When the axial line of exhaust pipe I6 and air inlet pipe 4 are not parallel, the more conducively elimination to high frequency treatment noise.

In the present embodiment, as shown, air inlet pipe 4 uses curved design in inlet, it is conducive to noise wideband processing unit Compact layout.

Finally, it is stated that above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng The utility model is described in detail according to preferred embodiment, those skilled in the art should understand that, it can be to this The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model It encloses, should all cover in the scope of the claims of the utility model.

Claims (10)

1. a kind of noise wideband processing unit, including shell, air inlet pipe and exhaust pipe, it is characterised in that: formed in the shell Relatively independent the first cavity and the second cavity；The exhaust pipe is two and respectively corresponds and be connected to first cavity and the Two cavitys, the air inlet pipe are connected to the first cavity or the second cavity；Connection is equipped between first cavity and the second cavity Channel.

2. noise wideband processing unit according to claim 1, it is characterised in that: second cavity is relative to the first chamber Body is along discharge directions arranged in parallel；The gas outlet of the air inlet pipe is located in the second cavity.

3. noise wideband processing unit according to claim 2, it is characterised in that: the exhaust pipe include exhaust pipe I and Exhaust pipe II；The exhaust pipe I is connected to the second cavity, and the exhaust pipe II passes through the second cavity and is connected to the first cavity；Institute It states air inlet pipe and is connected to the second cavity across the first cavity；Pass through partition segmentation and phase between first cavity and the second cavity To independence, the communicating pipe for being used to form communicating passage is provided with across partition.

4. noise wideband processing unit according to claim 1, it is characterised in that: the cross section of the shell be it is round or Ellipse.

5. noise wideband processing unit according to claim 3, it is characterised in that: the air inlet pipe is in the second cavity Inserting the ratio between length and the second cavity axial length is 1:4 to 1:10；The cross-sectional area of second cavity and air inlet pipe it is transversal Area ratio is greater than 5.

6. noise wideband processing unit according to claim 3, it is characterised in that: the communicating pipe is in the first cavity Inserting the ratio between length and the first cavity axial length is 1:2 to 1:5；The communicating pipe the second cavity interpolation length and the second chamber The ratio between body axial length is 1:2 to 1:5.

7. noise wideband processing unit according to claim 3, it is characterised in that: the exhaust pipe I interpolation length and the The ratio between two cavity axial lengths are 1:2 to 1:3.

8. noise wideband processing unit according to claim 3, it is characterised in that: the exhaust pipe II is in the first cavity The ratio between interpolation length and the first cavity axial length are 1:7 to 1:10.

9. noise wideband processing unit according to claim 3, it is characterised in that: the exhaust pipe I and exhaust pipe II are equal The Large Diameter Pipeline part of reduced pipe, the reduced pipe extends inwardly, and tubule path portion passes outwards through the second cavity tail end cover, described Tubule path portion to Large Diameter Pipeline part by smooth toroidal at transition, and the reducing of exhaust pipe I and exhaust pipe II are than equal It is 0.7 to 0.8.

10. noise wideband processing unit according to claim 3, it is characterised in that: the exhaust pipe I and air inlet pipe are along horizontal To being arranged in a staggered manner, and the spacing that is staggered accounts for the second cavity the 0.2 to 0.3 of the lateral dimension being staggered on direction.