CN210343465U - High-efficient blast pipe of noise that falls - Google Patents
High-efficient blast pipe of noise that falls Download PDFInfo
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- CN210343465U CN210343465U CN201920958830.3U CN201920958830U CN210343465U CN 210343465 U CN210343465 U CN 210343465U CN 201920958830 U CN201920958830 U CN 201920958830U CN 210343465 U CN210343465 U CN 210343465U
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- resonant cavity
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- expansion chamber
- noise reduction
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Abstract
The utility model relates to a high-efficient blast pipe of noise that falls, including barrel, intake pipe, outlet duct and hush pipe, be provided with expansion chamber, first resonant cavity, second resonant cavity and third resonant cavity in the barrel, the intake pipe communicates in expansion chamber, the outlet duct communicates in the third resonant cavity, hush pipe sets up in first resonant cavity, and both ends communicate respectively in expansion chamber and third resonant cavity, the last first hole that is provided with of hush pipe; one part of the air outlet pipe extends into the second resonant cavity from the third resonant cavity, the part is provided with a second outlet hole, and the other part of the air outlet pipe passes through the third resonant cavity from the second resonant cavity to the outer side of the cylinder. The utility model discloses in gaseous through expansion chamber, first resonant cavity, second resonant cavity and third resonant cavity treatment process, the motion stroke greatly increased of noise to slow down the time that the noise propagated, improved the noise reduction effect.
Description
Technical Field
The utility model relates to an automobile exhaust pipe technical field, in particular to blast pipe of high-efficient noise that falls.
Background
The exhaust pipe of a motor vehicle has been one of the main sources of noise for the vehicle. The noise is generally caused by instability of the high velocity air flow. The flowing air flow has the characteristics of high temperature, high pressure and high speed, the intensity of the discharged noise is high, the frequency spectrum is wide, the spread range is wide, and the physical health of drivers and passengers and the production and life of residents are seriously influenced.
For example: the utility model discloses a chinese utility model patent of application number 201220053248.0 discloses a vehicle vent-pipe of making an uproar falls, including the blast pipe, the blast pipe divide into top connection, lower clutch and barrel triplex, top connection, lower clutch are hourglass hopper-shaped, the blast pipe is equipped with a plurality of silencer and thin wall inner bag, and its thin wall inner bag is small in quantity, and the noise reduction effect is limited, and the through-hole on the thin wall inner bag blocks up easily moreover, hinders the air current and flows.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a blast pipe of high-efficient noise reduction improves the sound effect fruit of making an uproar that falls of blast pipe.
The above object of the present invention can be achieved by the following technical solutions: an exhaust pipe capable of efficiently reducing noise comprises a cylinder body, an air inlet pipe, an air outlet pipe and a silencing pipe, wherein an expansion cavity, a first resonant cavity, a second resonant cavity and a third resonant cavity are arranged in the cylinder body; one part of the gas outlet pipe extends into the second resonant cavity from the third resonant cavity, the part is provided with a second outlet hole, and the other part of the gas outlet pipe passes through the third resonant cavity from the second resonant cavity to the outer side of the cylinder.
Preferably, the sleeve is sleeved on the outer side of the silencing pipe, and silencing materials are filled between the outer wall of the silencing pipe and the inner wall of the sleeve.
Preferably, the inner diameter of the silencing tube gradually increases from the two ends to the middle to form a drum-shaped structure.
Preferably, the inner wall of the third resonant cavity is of a hollow structure and is divided into multiple layers of resonant regions by an inner wall plate, and the inner wall plate is provided with a through hole for communicating the third resonant cavity with the resonant regions.
And after the sound waves enter the resonance area of each layer through the through holes, the sound waves are continuously reflected by the inner wall plate until the sound waves are consumed.
Preferably, the hole diameter of the through-hole in the inner wall panel located on the inner side is larger than the hole diameter of the through-hole in the inner wall panel located on the outer side.
Preferably, the surface of the inner wall plate located in the resonance region is provided with protrusions protruding from the surface, and the surface located between two adjacent protrusions is provided with a sound-absorbing blind hole.
The protrusions and the sound-absorbing blind holes can change the reflection path of sound waves and prolong the reflection time of the sound waves.
Preferably, the expansion cavity is divided into a plurality of expansion chambers by partition plates, the expansion chambers comprise a first expansion chamber, a second expansion chamber and a third expansion chamber which are sequentially arranged, two adjacent expansion chambers are communicated through a filtering hole, the air inlet pipe penetrates through the first expansion chamber and the second expansion chamber and then extends into the third expansion chamber, and one end of the silencing pipe is communicated with the second expansion chamber.
Preferably, a third outlet hole is provided in the air inlet pipe located in the first extension chamber, and the first extension chamber is filled with a sound absorbing material.
When the air current gets into in the inlet tube, most high frequency sound wave gets into first expansion indoor through the third export to by the absorption material absorption in the first expansion indoor, accomplish preliminary amortization.
Preferably, the baffle is divided into a fixed baffle and a floating baffle, the fixed baffle is positioned between the first expansion chamber and the second expansion chamber and fixed in the expansion chamber, the floating baffle is positioned between the second expansion chamber and the third expansion chamber, the floating baffle is sleeved on the air inlet pipe, and an elastic resetting piece for pushing the floating baffle to move in the direction away from the baffle is arranged in the second expansion chamber.
When the airflow in the air inlet pipe is large, the airflow enters the third expansion chamber and pushes the floating partition plate to move reversely, so that the space of the third expansion chamber is enlarged, noise sound waves are reflected and absorbed in the large space, and only sound waves with a few frequencies near the natural frequency of the filter holes can enter the second expansion chamber through the filter holes; when the air current reduces, the noise that correspondingly produces is less, and the baffle that floats this moment restores to the throne under the effect of elasticity piece that restores to the throne, and third expansion chamber space reduces, and the air current gets into the second expansion chamber after passing through the third expansion chamber fast.
The utility model discloses following beneficial effect has:
1. in the treatment process of gas passing through the expansion cavity, the first resonant cavity, the second resonant cavity and the third resonant cavity, the movement stroke of noise is greatly increased, so that the time for noise propagation is reduced, and the noise reduction effect is improved;
2. the inner wall of the third resonant cavity is of a hollow structure, sound waves enter the resonant regions of each layer through the through holes and are continuously reflected by the inner wall plates, and the reflection time of the sound waves is prolonged until the sound waves are consumed;
3. the movable floating partition can move along with the change of the strength of the airflow, so that the space size of the third expansion chamber is adaptively changed.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a schematic structural diagram of embodiment 2 of the present invention;
in the figure: 1-cylinder, 11-expansion cavity, 111-first expansion chamber, 112-second expansion chamber, 113-third expansion chamber, 12-first resonance cavity, 13-second resonance cavity, 14-third resonance cavity, 15-partition plate, 15A-fixed partition plate, 15B-floating partition plate, 16-filtering hole, 17-elastic resetting piece, 2-air inlet pipe, 21-third outlet hole, 3-air outlet pipe, 31-second outlet hole, 4-silencing pipe, 41-first outlet hole, 5-sleeve, 6-inner wall plate, 61-through hole, 62-bulge, 63-sound-absorbing blind hole and 7-resonance region.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws within the scope of the claims of the present invention.
Example 1: as shown in fig. 1 and 2, an exhaust pipe for efficiently reducing noise includes a cylinder 1, an air inlet pipe 2, an air outlet pipe 3, and a muffler pipe 4, wherein an expansion chamber 11, a first resonant chamber 12, a second resonant chamber 13, and a third resonant chamber 14 are disposed in the cylinder 1, the expansion chamber 11 and the third resonant chamber 14 are disposed at two ends of the cylinder 1, and the first resonant chamber 12 and the second resonant chamber 13 are disposed in the middle of the cylinder 1.
The air inlet pipe 2 is communicated with the expansion cavity 11, the air outlet pipe 3 is communicated with the third resonant cavity 14, the silencing pipe 4 is arranged in the first resonant cavity 12, two ends of the silencing pipe are respectively communicated with the expansion cavity 11 and the third resonant cavity 14, a first outlet hole 41 is formed in the silencing pipe 4, and the silencing pipe 4 is communicated with the first resonant cavity 12 through the first outlet hole 41.
The outlet pipe 3 is in a U-shaped bent structure, a portion of which extends from the third resonant cavity 14 into the second resonant cavity 13 and is provided with a second outlet hole 31, the outlet pipe 3 is communicated with the second resonant cavity 13 through the second outlet hole 31, and the other portion of which passes through the third resonant cavity 14 from the second resonant cavity 13 to the outside of the cylinder 1.
The sleeve 5 is sleeved on the outer side of the silencing pipe 4, and the sleeve 5 wraps the outer side of the first outlet 41. And a silencing material is filled between the outer wall of the silencing pipe 4 and the inner wall of the sleeve 5, and is foamed aluminum.
As shown in FIG. 2, the inner wall of the third resonant cavity 14 is hollow and is divided into multiple layers of resonant regions 7 by the inner wall plate 6, and the inner wall plate 6 is provided with a through hole 61 for communicating the third resonant cavity 14 with the resonant regions 7. The through-hole 61 in the inner wall plate 6 on the inner side has a larger hole diameter than the through-hole 61 in the inner wall plate 6 on the outer side. The inner wall plate 6 is provided with protrusions 62 protruding from the plate surface on the plate surface located in the resonance region 7, and a sound-absorbing blind hole 63 is arranged on the plate surface located between two adjacent protrusions 62.
The expansion cavity 11 is divided into a plurality of expansion chambers by partition boards 15, and comprises a first expansion chamber 111, a second expansion chamber 112 and a third expansion chamber 113 which are sequentially arranged, two adjacent expansion chambers are communicated through a filtering hole 16, the air inlet pipe 2 penetrates through the first expansion chamber 111 and the second expansion chamber 112 and then extends into the third expansion chamber 113, and one end of the silencing pipe 4 is communicated with the second expansion chamber 112. The air inlet pipe 2 in the first expansion chamber 111 is provided with a third outlet 21, the first expansion chamber 111 is filled with a sound absorption material, the sound absorption material is glass fiber yarns and felts, and the glass fiber yarns and the felts are distributed in a staggered and laminated manner along the length direction of the cylinder 1.
When the air flow enters the expansion cavity 11 from the air inlet pipe 2, the high-frequency sound waves enter the first expansion chamber 111 through the third outlet hole 21, and the primary noise reduction is performed by the sound absorption material of the first expansion chamber 111; the airflow enters the third expansion chamber 113, only a few frequency sound waves near the natural frequency of the through hole 8 can reach the second expansion chamber 112 through the through hole 8, and the other few frequency sound waves cannot pass through the filter hole 16 and can be continuously reflected in the third expansion chamber 113 only until the momentum of the airflow disappears, so that secondary noise reduction is completed; the air flow in the second expansion chamber 112 enters the third resonance chamber 14 through the muffler pipe 4, and when passing through the muffler pipe 4, the sound wave is noise-reduced three times through the sleeve 5 outside the first outlet hole 41; the gas entering the third resonant cavity 14 passes through the hollow inner wall of the third resonant cavity 14, so that the sound waves with various frequencies are reflected and absorbed in the resonant regions 7 of each layer, and four times of noise reduction is completed; the third resonance chamber 14 is then discharged through the outlet duct 3, before being discharged, part of the gas flow enters the second resonance chamber 13 through the second outlet orifice 31, where five noise reductions are accomplished in the second resonance chamber 13.
Example 2: as shown in fig. 3, the difference from embodiment 1 is that the inner diameter of the silencer duct 4 is gradually increased from both ends to the middle to form a drum-shaped structure.
The baffle 15 is divided into a fixed baffle 15A and a floating baffle 15B, the fixed baffle 15A is positioned between the first expansion chamber 111 and the second expansion chamber 112 and fixed in the expansion cavity 11, the floating baffle 15B is positioned between the second expansion chamber 112 and the third expansion chamber 113, the floating baffle 15B is sleeved on the air inlet pipe 2, an elastic reset piece 17 for pushing the floating baffle 15B to move towards the direction far away from the baffle 15 is arranged in the second expansion chamber 112, and the elastic reset piece 17 is a spring.
Claims (9)
1. The utility model provides an exhaust pipe of high-efficient noise reduction, includes barrel (1), intake pipe (2), outlet duct (3) and hush pipe (4), its characterized in that: an expansion cavity (11), a first resonant cavity (12), a second resonant cavity (13) and a third resonant cavity (14) are arranged in the cylinder (1), the air inlet pipe (2) is communicated with the expansion cavity (11), the air outlet pipe (3) is communicated with the third resonant cavity (14), the silencing pipe (4) is arranged in the first resonant cavity (12), two ends of the silencing pipe are respectively communicated with the expansion cavity (11) and the third resonant cavity (14), and a first outlet hole (41) is formed in the silencing pipe (4); one part of the air outlet pipe (3) extends into the second resonant cavity (13) from the third resonant cavity (14), and is provided with a second outlet hole (31), and the other part of the air outlet pipe passes through the third resonant cavity (14) from the second resonant cavity (13) to the outer side of the cylinder (1).
2. The exhaust pipe with high noise reduction efficiency as claimed in claim 1, wherein: the sleeve (5) is sleeved on the outer side of the silencing pipe (4), and silencing materials are filled between the outer wall of the silencing pipe (4) and the inner wall of the sleeve (5).
3. The exhaust pipe with high noise reduction efficiency as claimed in claim 1, wherein: the inner diameter of the silencing pipe (4) is gradually increased from two ends to the middle to form a drum-shaped structure.
4. The exhaust pipe with high noise reduction efficiency as claimed in claim 1, wherein: the inner wall of the third resonant cavity (14) is of a hollow structure and is divided into a plurality of layers of resonant regions (7) through an inner wall plate (6), and through holes (61) for communicating the third resonant cavity (14) with the resonant regions (7) are formed in the inner wall plate (6).
5. The exhaust pipe with high noise reduction efficiency as claimed in claim 4, wherein: the diameter of the through-hole (61) in the inner wall panel (6) on the inner side is larger than the diameter of the through-hole (61) in the inner wall panel (6) on the outer side.
6. The exhaust pipe with high noise reduction efficiency as claimed in claim 4, wherein: the panel that is located resonance area (7) of interior wallboard (6) is provided with arch (62) of protrusion in the panel, is located to be provided with on the panel between two adjacent arch (62) and inhales sound blind hole (63).
7. The exhaust pipe with high noise reduction efficiency as claimed in claim 1, wherein: expand chamber (11) and separate into a plurality of expansion rooms through baffle (15), including first expansion room (111), second expansion room (112) and third expansion room (113) that arrange in proper order, communicate through filtration pore (16) between two adjacent expansion rooms, intake pipe (2) are stretched into in third expansion room (113) after passing first expansion room (111) and second expansion room (112), the one end of amortization pipe (4) communicates in second expansion room (112).
8. The exhaust pipe with high noise reduction efficiency as claimed in claim 7, wherein: and a third outlet hole (21) is formed in the air inlet pipe (2) in the first expansion chamber (111), and a sound absorption material is filled in the first expansion chamber (111).
9. The exhaust pipe with high noise reduction efficiency as claimed in claim 7, wherein: baffle (15) divide into fixed baffle (15A) and floating baffle (15B), fixed baffle (15A) are located between first expansion chamber (111) and second expansion chamber (112) and fix in expansion chamber (11), floating baffle (15B) are located between second expansion chamber (112) and third expansion chamber (113), floating baffle (15B) suit is on intake pipe (2), be provided with the elasticity that promotes floating baffle (15B) and remove to keeping away from baffle (15) direction in the second expansion chamber (112) and reset piece (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920958830.3U CN210343465U (en) | 2019-06-25 | 2019-06-25 | High-efficient blast pipe of noise that falls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920958830.3U CN210343465U (en) | 2019-06-25 | 2019-06-25 | High-efficient blast pipe of noise that falls |
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| Publication Number | Publication Date |
|---|---|
| CN210343465U true CN210343465U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920958830.3U Active CN210343465U (en) | 2019-06-25 | 2019-06-25 | High-efficient blast pipe of noise that falls |
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| CN (1) | CN210343465U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230532A (en) * | 2019-06-25 | 2019-09-13 | 湖州新兴汽车部件有限公司 | A kind of exhaust pipe of high-efficient noise-reducing sound |
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2019
- 2019-06-25 CN CN201920958830.3U patent/CN210343465U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230532A (en) * | 2019-06-25 | 2019-09-13 | 湖州新兴汽车部件有限公司 | A kind of exhaust pipe of high-efficient noise-reducing sound |
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