CN206158820U - Impedance combined silencer - Google Patents
Impedance combined silencer Download PDFInfo
- Publication number
- CN206158820U CN206158820U CN201621146668.8U CN201621146668U CN206158820U CN 206158820 U CN206158820 U CN 206158820U CN 201621146668 U CN201621146668 U CN 201621146668U CN 206158820 U CN206158820 U CN 206158820U
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- baffle
- chamber
- punch block
- perforation
- pipe
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Abstract
The utility model belongs to the technical field of motor vehicle exhaust system, especially, relate to an impedance combined silencer, which comprises an outer shell, baffle and the cavity of setting in the shell, the baffle is including the first baffle that sets gradually, second baffle and third baffle, the cavity includes by first baffle, the first cavity that second baffle and third baffle separate in proper order, the second cavity, third cavity and fourth cavity, the shell includes front end housing and rear end cap, be equipped with in the cavity and run through the front end housing, first baffle, the intake pipe of second baffle, run through first baffle, the second baffle, the outlet duct of third baffle and rear end cap, run through on the third baffle and be equipped with interior intubate, be equipped with first punch block and second punch block on first baffle and the second baffle respectively, the intake pipe is located and is equipped with third punch block and fourth punch block on the pipe wall of first cavity and second cavity respectively, the cover is equipped with the sleeve pipe on the fourth punch block, the intraductal sound absorbing material that is equipped with of cover, the outlet duct is located and is equipped with the 5th punch block on the pipe wall of second cavity.
Description
Technical field
This utility model belongs to motor vehicle exhaustion system technical field, more particularly to a kind of impedance composite muffler.
Background technology
With the development of transportation, the problem of noise pollution of automobile becomes increasingly conspicuous, it has also become the world today is topmost
Pollution source of noise.And exhaust noise is one of topmost noise source in automobile noise, the quality of Study of Acoustic Performance of Exhaust Muffler is directly
Have influence on the acoustic quality of automobile.In automotive muffler field, mainly there are the conventional acoustic filter of three classes, i.e. resistance noise reduction at present
Device, reactive muffler and impedance composite muffler.
Dissipative muffler is a kind of absorption-type acoustic filter, when it is propagated in porous sound-absorbing material using sound wave, because
Acoustic energy is converted into heat energy and is dissipated by friction, so as to reach the purpose of noise elimination.The acoustic attenuation performance of material is similar in circuit
Resistance consumes electrical power, so as to gain the name.It is, in general, that dissipative muffler has good medium-high frequency acoustic attenuation performance, low frequency is disappeared
Acoustic performance is poor.
Reactive muffler is different from dissipative muffler, and it does not use sound-absorbing material, but the mutation by pipeline section or
Business connects resonant cavity etc. and causes the change of impedance during acoustic propagation and produce the reflection of acoustic energy, interfere and resonance sound-absorbing is reducing
Acoustic filter reaches noise elimination purpose to extraradial acoustic energy.From in terms of energy point of view, dissipative muffler uses the side of energy conversion
Method is reducing the acoustic energy at muffler outlet, and the method that reactive muffler is mainly shifted using acoustic energy is reducing muffler outlet
The acoustic energy at place.Reactive muffler centering, low-frequency noise inhibition are preferable, but high frequency acoustic attenuation performance is poor.
The characteristics of structure of impedance composite muffler incorporates first two acoustic filter, both can be absorbed sound material by porous
High-frequency sound energy is converted into heat energy by material, again can by the reflection of acoustic energy, interfere and resonate come in suppressing, the biography of low-frequency sound wave
Pass, with wider deadening frequency band.
Because impedance composite muffler overcomes the shortcoming of reactive muffler and dissipative muffler, its acoustic attenuation performance and automobile
The spectral characteristic of exhaust noise can preferably keep symmetrical, therefore such acoustic filter has been obtained widely in automobile exhaust system
Using.One good complex muffler wants comprehensive acoustic attenuation performance, aerodynamic quality, mechanical performance, technique and cost etc. many
Aspect factor.The design of complex muffler will select suitable noise elimination structure by certain suitable according to the characteristic of noise source itself
Sequence combines, on this basis optimum structural parameter, to reach optimal combination property.However, existing most impedances are multiple
Box-like acoustic filter does not consider in design from above-mentioned many aspects, more only considers acoustic attenuation performance or cost etc.
Aspect, therefore acoustic filter often occurs that back pressure is too high, power loss is big, structural strength is low or the low problem of reliability.In addition,
Existing general acoustic filter carries out performance improvement often through the quantity of simply regulating fender, interpolation pipe and resistance element,
Volume not to chamber, piercing aperture and number, sound-absorbing material type and its physical characteristics (thickness, density of material, accumulation
Density etc.) etc. aspect be optimized, the actual acoustic attenuation performance of these acoustic filters is unsatisfactory.
In view of above-mentioned defect, the design people, actively in addition research and innovation, eliminates the noise to founding a kind of impedance complex formula
Device so as to more the value in industry.
Utility model content
To solve above-mentioned technical problem, the purpose of this utility model is to provide a kind of impedance composite muffler, by many
Guiding the motion of air-flow and sound wave, the propagation path for making sound wave increases, and completes multiple for individual chamber, baffle plate and punch block
180 ° of air-flow revolution, largely reduces acoustic energy.
The utility model proposes a kind of impedance composite muffler, including shell, be arranged on the baffle plate of the inside the shell
And chamber, the baffle plate includes the first baffle, second baffle and the third baffle that set gradually, and the chamber is included by described the
First chamber, second chamber, the 3rd chamber and the 4th chamber that one baffle plate, second baffle and third baffle separate successively, it is described
Shell includes drive end bearing bracket and rear end cap, the within the chamber be provided with through the drive end bearing bracket, first baffle, second baffle air inlet
Pipe, on the escape pipe of the first baffle, second baffle, third baffle and rear end cap, the third baffle through being provided with
Interpolation pipe, is respectively equipped with the first punch block and the second punch block on the first baffle and second baffle, the air inlet pipe is located at
The 3rd punch block and the 4th punch block are respectively equipped with the tube wall of the first chamber and second chamber, on the 4th punch block
Sleeve pipe is arranged with, sound-absorbing material is provided with described sleeve pipe, the escape pipe is located at the tube wall of the second chamber and is provided with the 5th
Punch block.
Further, first punch block and the second punch block including 114 first perforation, its a diameter of 6 ±
1mm, first perforation distributions in four regions, arrange according to 3 rows 3 respectively, 7 rows 4 are arranged, 3 rows 3 are arranged and 7 row 4 row carry out in-line arrangement cloth
If.
Further, the 3rd punch block includes 8 second perforation, and its a diameter of 4 ± 1mm, second perforation is enclosed
Arrange within one week around the air inlet pipe.
Further, the 4th punch block includes 264 the 3rd perforation, its a diameter of 4 ± 1mm, the 3rd perforation
Lay according to the row in-line arrangement of 24 row 11.
Further, the 5th punch block includes 72 the 4th perforation, and its a diameter of 5 ± 1mm, the 4th perforation is pressed
Set according to the row fork arrangement of 18 row 4.
Further, the interpolation pipe is connected with reinforcement with the exhaust port of the air inlet pipe.
Further, the front and back end portses of described sleeve pipe are shut respectively by the first baffle and second baffle.
Further, the material of the sound-absorbing material is ultra-fine fibre glass cotton, and density of material is 1000kg/m3~
1200kg/m3, the bulk density of material is 100kg/m3～200kg/m3。
Further, the length of the chamber is 535 ± 5mm, and its cross section is ellipse, and the oval major axis sets
It is set to 235 ± 3mm, short axle and is set to 172 ± 3mm.
Further, the length of the first chamber is 132 ± 2mm, and the length of the second chamber is 161 ± 2mm, institute
The length for stating the 3rd chamber is 124 ± 2mm, and the length of the 4th chamber is 118 ± 2mm.
By such scheme, this utility model at least has advantages below：The impedance composite muffler, by multiple chambers
Room, baffle plate and punch block complete multiple 180 ° guiding the motion of air-flow and sound wave, the propagation path for making sound wave to increase
Air-flow is turned round, and largely reduces acoustic energy, and each parts of the acoustic filter belong to conventional type, manufacturing process letter
Single, cost is relatively low, is adapted to batch production.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of description, with preferred embodiment of the present utility model and coordinate accompanying drawing detailed below
Describe in detail bright as after.
Description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 be in Fig. 1 A to schematic diagram；
Fig. 3 be in Fig. 1 B to schematic diagram；
Fig. 4 be in Fig. 1 C to schematic diagram.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate this utility model, but is not limited to scope of the present utility model.
Referring to Fig. 1 to 4, a kind of preferably described impedance composite muffler of this utility model one, including shell 1, setting
Baffle plate and chamber in shell 1.Baffle plate includes first baffle 2, second baffle 3 and the third baffle 4 for setting gradually, chamber bag
Include first chamber 5, second chamber 6, the 3rd chamber 7 and separated successively by first baffle 2, second baffle 3 and third baffle 4
Four chambers 8.Shell 1 includes drive end bearing bracket 11 and rear end cap 12, and within the chamber is provided with through drive end bearing bracket 11, first baffle 2, second baffle
3 air inlet pipe 9, through the escape pipe 10 of first baffle 2, second baffle 3, third baffle 4 and rear end cap 12.In third baffle 4
Through interpolation pipe 13 is provided with, interpolation pipe 13 is fastenedly connected with reinforcement 14 with the exhaust port of air inlet pipe 9.
The first punch block 15 and the second punch block 16 are respectively equipped with first baffle 2 and second baffle 3, air inlet pipe 9 is located at
The 3rd punch block 17 and the 4th punch block 18 are respectively equipped with the tube wall of first chamber 5 and second chamber 6, on the 4th punch block 18
Sleeve pipe 19 is arranged with, sleeve pipe 19 is perpendicularly fixed between first baffle 2 and second baffle 3, coaxial with air inlet pipe 9, and before it
Rear port is shut respectively by first baffle 2 and second baffle 3, is provided with sound-absorbing material in sleeve pipe 19, and sound-absorbing material is completely covered the
Four punch blocks 18, the material of sound-absorbing material is ultra-fine fibre glass cotton, and density of material is 1000kg/m3～1200kg/m3, material
Bulk density be 100kg/m3～200kg/m3, the sound-absorbing material can realize high frequency acoustically effective in the case of low cost
Maximization, escape pipe 10 be located at second chamber 6 tube wall be provided with the 5th punch block 20.
First punch block 15 and the second punch block 16 are including 114 first perforation, its a diameter of 6 ± 1mm, the first perforation
Be distributed in four regions, arrange according to 3 rows 3 respectively, 7 rows 4 are arranged, 3 rows 3 are arranged and 7 row 4 row carry out in-line arrangement laying.The two punch blocks
Aperture and it is above-mentioned first perforation lay array both served certain soundproof effect, in turn ensure that the flowing of waste gas is unimpeded
Property, make the pressure loss in the reasonable scope.
3rd punch block 17 includes 8 second perforation, and its a diameter of 4 ± 1mm, the second perforation is arranged for 9 one weeks around air inlet pipe
Cloth.Biperforate aperture and its laying array cause sound wave to generate interference in the 3rd punch block 17, make making an uproar for characteristic frequency
Sound is suppressed.
4th punch block 18 includes 264 the 3rd perforation, and its a diameter of 4 ± 1mm, the 3rd perforation is surrounded according to the row of 24 row 11
9 one weeks in-line arrangements of air inlet pipe are laid.The aperture of the 3rd perforation and its laying array enable a large amount of high frequency sound waves to enter sound absorber
The inside of material, and acoustic energy and hot transformation of energy are carried out wherein.
5th punch block 20 includes 72 the 4th perforation, and its a diameter of 5 ± 1mm, the 4th perforation is surrounded out according to the row of 18 row 4
The fork arrangement of trachea 10 sets.On the one hand the aperture of the 4th perforation and its laying array cause substantial amounts of noise in exhaustor to pass through the 5th
Punch block 20 enters second chamber 6, produces impedance unbalance, causes the weakening of noise, and on the other hand, the 5th punch block 20 is larger
Local flow resistance inhibits waste gas stream to enter in second chamber 6, reduces the pressure loss of air-flow.
The length of chamber is 535 ± 5mm, and its cross section is ellipse, and oval major axis is set to 235 ± 3mm, short axle
It is set to 172 ± 3mm.The length of first chamber 5 is 132 ± 2mm, and the length of second chamber 6 is 161 ± 2mm, the 3rd chamber 7
Length be 124 ± 2mm, the length of the 4th chamber 8 is 118 ± 2mm.Can be produced by the chamber of different length with not
With the acoustic characteristicses of frequency range, the effect by frequency for eliminating expansion cavity is particularly served.
The impedance composite muffler operation principle is as follows：Waste gas is entered from air inlet pipe 9, then pass through air inlet pipe 9 and its
During three punch block 17 on tube wall, few portion is entered in first chamber 5 by the 3rd punch block 17, and the overwhelming majority is useless
Gas is moved forward by air inlet pipe 9, the 4th punch block 18 through on the tube wall of air inlet pipe 9, because sleeve pipe 19 and the 4th is bored a hole
Sound-absorbing material is filled between area 18, and the rear and front end of sleeve pipe 19 is shut by first baffle 2 and second baffle 3, thus it is all of
Waste gas moves in air inlet pipe 9, and now most high-frequency noises are entered inside sound-absorbing material, in sound by the 4th punch block 18
During wave reflection, the acoustic energy of high-frequency noise has been converted into heat energy.Waste gas flows through the exhaust port of air inlet pipe 9 and enters the 3rd chamber
Sufficiently expanded during room 7 and expanded, sound wave now has been carried out reflection because of impedance unbalance, interfered, so as to suppress
The transmission of acoustic wave segment.4th chamber 8 constitutes a Helmholz resonance device with interpolation pipe 13, and the low frequency of characteristic frequency is made an uproar
Sound carries out generation resonance repeatedly in resonator and is weakened.
Waste gas stream is entered after the intramedullary expansion of the 3rd chamber 7 and expansion by the second punch block 16 laid on second baffle 3
Second chamber 6, now small part waste gas stream escape pipe 10 is entered by the 5th punch block 20 laid on escape pipe 10, and along
The chamber of escape pipe 10 and outflow acoustic filter, most of waste gas stream is entered by the first punch block 15 laid on first baffle 2
In first chamber 5, the transmitting of the 3rd punch block 17 that now noise of some characteristic frequency is laid in air inlet pipe 9 is interfered and is cut
Weak, the waste gas stream of diffusion is shunk in the air inlet port of escape pipe 10, and discharges the chamber of acoustic filter along escape pipe 10, this
When, noise causes impedance unbalance because of the contraction of the air inlet port of exhaustor in first chamber 5, so as to inhibit the biography of sound wave
Pass.Because the 5th punch block 20 laid on escape pipe 10 constitutes an expansion cavity in second chamber 6, noise is in the expansion cavity
Inside further weakened.
In sum, impedance composite muffler proposed by the present invention considers acoustic attenuation performance, aerodynamic comprehensively
The aspect factor such as energy, mechanical performance, technique and cost, by reasonable Arrangement and design each chamber, baffle plate, punch block, turnover
Trachea and sound-absorbing material etc., finally propose a kind of preferable acoustic filter of combination property, and the acoustic filter compensate in prior art
Some defects for existing and deficiency, the market value with high industrial, it has advantages below：(1) the impedance complex formula
Acoustic filter guides the motion of air-flow and sound wave by multiple chambers, baffle plate and punch block, and the propagation path for making sound wave increases, and
Multiple 180 ° of air-flow revolution is completed, acoustic energy is largely reduced；(2) by reasonably arranging the length of each chamber
With the length for entering escape pipe, 3 different expansion cavities of acoustic attenuation performance are defined, for the suppression of different frequency range noise；(3) basis
" quarter-wave " principle arranges the 3rd punch block 17 as one on the tube wall of the air inlet pipe 9 in first chamber 5
Individual interference muffling unit, for the suppression of characteristic frequency noise；(4) one has been collectively constituted by the chamber 7 of interpolation pipe 13 and the 3rd
Helmholtz resonator, can dramatically be cut by the physical dimension of the physical dimension and the 3rd cavity that adjust interpolation pipe 13
Subtract the noise under characteristic frequency；(5) collectively constituted by the 4th punch block 18 in second chamber 6, sleeve pipe 19 and sound-absorbing material
Dissipative muffler, by rationally arranging the performance parameter of the perforation of the 4th punch block 18 (such as piercing aperture, punching rate and extent of perforation
Deng) and sound-absorbing material performance parameter (material of sound-absorbing material, density of material, bulk density and thickness etc.), can be effectively
Reduce high-frequency noise；(6) reinforcement 14 is tightened together air inlet pipe 9 and interpolation pipe 13 by bridge joint effect, is greatly improved
The strength and stiffness of interpolation pipe 13 so as to which reliability increases, reduce the risk for producing vibration noise；(7) by reasonably
The piercing aperture and hole count and the caliber and pipe of air inlet pipe 9 and escape pipe 10 of the first punch block 15 and the second punch block 16 are set
It is long, make air current flow smooth, vortex amount is reduced, finally allow the pressure loss to maintain in a zone of reasonableness；(8) from technique and into
Originally saw, each parts of acoustic filter belong to conventional type, and manufacturing process is simple, and cost is relatively low, is adapted to batch production.
The above is only preferred implementation of the present utility model, is not limited to this utility model, it is noted that
For those skilled in the art, on the premise of without departing from this utility model know-why, can also do
Go out some improvement and modification, these are improved and modification also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of impedance composite muffler, it is characterised in that：Including shell, the baffle plate and chamber of the inside the shell are arranged on,
The baffle plate includes the first baffle, second baffle and the third baffle that set gradually, the chamber include by the first baffle,
First chamber, second chamber, the 3rd chamber and the 4th chamber that second baffle and third baffle separate successively, the shell includes
Drive end bearing bracket and rear end cap, the within the chamber be provided with through the drive end bearing bracket, first baffle, the air inlet pipe of second baffle, through institute
The escape pipe of first baffle, second baffle, third baffle and rear end cap is stated, runs through being provided with interpolation pipe in the third baffle, institute
State and the first punch block and the second punch block are respectively equipped with first baffle and second baffle, the air inlet pipe is located at first chamber
The 3rd punch block and the 4th punch block are respectively equipped with the tube wall of room and second chamber, on the 4th punch block set is arranged with
Pipe, is provided with sound-absorbing material in described sleeve pipe, the escape pipe is located at the tube wall of the second chamber and is provided with the 5th punch block.
2. impedance composite muffler according to claim 1, it is characterised in that：First punch block and the second perforation
Qu Jun include 114 first perforation, its a diameter of 6 ± 1mm, first perforation distributions in four regions, respectively according to 3 rows 3
Row, 7 rows 4 are arranged, 3 rows 3 are arranged and the row of 7 row 4 carry out in-line arrangement laying.
3. impedance composite muffler according to claim 1, it is characterised in that：3rd punch block includes 8 the
Two perforation, its a diameter of 4 ± 1mm, second perforation is arranged for one week around the air inlet pipe.
4. impedance composite muffler according to claim 1, it is characterised in that：4th punch block includes 264
3rd perforation, its a diameter of 4 ± 1mm, the 3rd perforation is laid according to the row in-line arrangement of 24 row 11.
5. impedance composite muffler according to claim 1, it is characterised in that：5th punch block includes 72 the
Four perforation, its a diameter of 5 ± 1mm, the 4th perforation sets according to the row fork arrangement of 18 row 4.
6. impedance composite muffler according to claim 1, it is characterised in that：The interpolation pipe and the air inlet pipe
Exhaust port is connected with reinforcement.
7. impedance composite muffler according to claim 1, it is characterised in that：The front and back end portses of described sleeve pipe respectively by
The first baffle and second baffle are shut.
8. impedance composite muffler according to claim 1, it is characterised in that：The material of the sound-absorbing material is ultra-fine
Glass fibre cotton, density of material is 1000kg/m3～1200kg/m3, the bulk density of material is 100kg/m3～200kg/m3。
9. impedance composite muffler according to claim 1, it is characterised in that：The length of the chamber be 535 ±
5mm, its cross section is ellipse, and the oval major axis is set to 235 ± 3mm, short axle and is set to 172 ± 3mm.
10. impedance composite muffler according to claim 1, it is characterised in that：The length of the first chamber is 132
± 2mm, the length of the second chamber is 161 ± 2mm, and the length of the 3rd chamber is 124 ± 2mm, the 4th chamber
Length be 118 ± 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621146668.8U CN206158820U (en) | 2016-10-21 | 2016-10-21 | Impedance combined silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621146668.8U CN206158820U (en) | 2016-10-21 | 2016-10-21 | Impedance combined silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206158820U true CN206158820U (en) | 2017-05-10 |
Family
ID=58655421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621146668.8U Expired - Fee Related CN206158820U (en) | 2016-10-21 | 2016-10-21 | Impedance combined silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206158820U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898443A (en) * | 2021-10-09 | 2022-01-07 | 宿州学院 | Exhaust damping and silencing device of agricultural machinery |
-
2016
- 2016-10-21 CN CN201621146668.8U patent/CN206158820U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898443A (en) * | 2021-10-09 | 2022-01-07 | 宿州学院 | Exhaust damping and silencing device of agricultural machinery |
| CN113898443B (en) * | 2021-10-09 | 2023-02-17 | 宿州学院 | Exhaust damping and silencing device of agricultural machinery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170510 Termination date: 20211021 |
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| CF01 | Termination of patent right due to non-payment of annual fee |