CN219529115U

CN219529115U - Silencer

Info

Publication number: CN219529115U
Application number: CN202320904404.8U
Authority: CN
Inventors: 蒋亨雷; 李东彪
Original assignee: Zhejiang Junhe Technology Co ltd
Current assignee: Zhejiang Junhe Technology Co ltd
Priority date: 2023-04-15
Filing date: 2023-04-15
Publication date: 2023-08-15
Anticipated expiration: 2033-04-15

Abstract

The utility model relates to the field of silencing devices for automobiles, in particular to a silencer, which comprises an outer shell and an inner shell, wherein the outer shell is sleeved on the inner shell, a closed cavity is formed between the outer shell and the inner shell, a first partition plate and a second partition plate are arranged outside the inner shell, the first partition plate and the second partition plate divide the closed cavity into a first cavity, a second cavity and a third cavity along the sound transmission direction, noise reduction holes are formed in the inner shell, and a sound absorbing layer is arranged in the first cavity. The utility model can improve the silencing effect on the multi-band noise of the turbocharger.

Description

Silencer

Technical Field

The utility model relates to the field of silencing devices for automobiles, in particular to a silencer.

Background

The exhaust gas turbocharger is a device installed near the exhaust pipe and used for increasing the air inflow by compressing air, and the principle is that the inertial impulse of the exhaust gas discharged by the engine is utilized to push the turbine in the turbine chamber, the turbine drives the coaxial impeller, and the impeller presses and pumps the air sent by the air filter pipeline to be pressurized into the cylinder, so that the effect of increasing the output power of the engine is achieved. The turbocharger can generate various noises in the running process, so that urban noise pollution is aggravated, and the common noise reduction mode is to install a silencer at the air outlet end of the turbocharger so as to play a role in reducing noise.

The traditional silencer mainly comprises an inner shell and an outer shell, wherein a cavity is arranged between the inner shell and the outer shell, a plurality of round holes are formed in the inner shell, when exhaust gas passes through the inner shell, the round holes in the inner shell can weaken sound, and the noise frequency which can be restrained by the silencer is mainly medium and low frequency; because the noise frequency that produces when turbo charger operating speed is different also is different, when the noise frequency that produces is high frequency, traditional muffler is to the noise elimination of this frequency channel, suppression effect is relatively poor.

Disclosure of Invention

The utility model provides a silencer for further improving the silencing effect of multi-frequency band noise generated by a turbocharger.

The silencer provided by the utility model adopts the following technical scheme:

the utility model provides a muffler, includes shell and inner shell, the shell cover is established on the inner shell, form sealed cavity between shell and the inner shell, be provided with first baffle and second baffle outside the inner shell, first baffle and second baffle will sealed cavity divide into first cavity, second cavity and third cavity along the direction of sound transmission, be provided with the hole of making an uproar that falls on the inner shell, be provided with the sound absorbing layer in the first cavity.

Through adopting above-mentioned technical scheme, when noise passes through this muffler along with waste gas, the sound wave can get into first cavity, second cavity and third cavity respectively through the hole of making an uproar that falls, gets into the sound wave in the first cavity, and the middle-high frequency band noise of wherein is absorbed by the sound absorbing layer to realize the amortization of middle-high frequency band noise. Noise in the middle and low frequency bands is reflected and interfered with each other in the first cavity, and then noise in the middle and low frequency bands can be reduced through reflection and interference in the second cavity and the third cavity, so that the noise reducing effect is better.

Optionally, the plurality of noise reduction holes are formed in the inner shell, the noise reduction holes corresponding to the first cavity are first noise reduction holes, the noise reduction holes corresponding to the second cavity are second noise reduction holes, and the noise reduction holes corresponding to the third cavity are third noise reduction holes; at least two first noise reduction holes are formed along the direction of sound transmission.

Through adopting above-mentioned technical scheme, noise gets into first cavity, second cavity and third cavity in proper order in the transmission in-process, and wherein, the noise that gets into in the first cavity is strongest, through setting up first cavity to a plurality of, can be weakened by the primary weakening when the sound wave passes through a plurality of first noise reduction holes, breaks up sound wave energy.

Optionally, the noise reduction holes are arranged in a long strip shape.

Through adopting above-mentioned technical scheme, when noise frequency is higher, if the hole of making an uproar falls sets up to aperture form, the sound wave produces the phenomenon of howling easily through the hole of making an uproar falls, through say the hole of making an uproar and set up to rectangular shape, can effectively avoid the production of the phenomenon of howling.

Optionally, the second chamber and the third chamber are respectively located at two sides of the second partition board, the second partition board is connected to the inner shell, a gap is formed between the second partition board and the outer shell, and a communication channel is formed, and the second chamber and the third chamber are communicated through the communication channel.

By adopting the technical scheme, the sound wave can enter the third cavity after being reflected in the second cavity and interfere with the sound wave entering the third noise reduction hole, so that the effect of mutual cancellation of the sound is achieved.

Optionally, the sound absorbing layer is attached to the housing, and is installed corresponding to the first noise reduction hole.

By adopting the technical scheme, the sound absorption layer is arranged on the shell, so that the installation is more convenient; meanwhile, sound waves entering the first cavity through the first noise reduction holes can directly collide on the sound absorption layer, and the sound absorption effect is better.

Optionally, the sound absorbing layer includes a plurality of sound absorbing parts, and adjacent sound absorbing parts are arranged at intervals.

Through adopting above-mentioned technical scheme, noise can cause air vibration at reflection in-process, and partial acoustic energy can be converted into heat energy, and waste gas carries the heat simultaneously, can lead to this muffler temperature higher, will inhale the sound portion interval setting, more is favorable to the heat dissipation.

Optionally, the side surface of the sound absorbing part, which is close to the inner shell, is provided with a plurality of grooves.

By adopting the technical scheme, the surface of the sound absorbing part forms a porous structure, and the sound absorbing effect is better.

Optionally, the groove includes a reduced mouth portion and a flared mouth portion, the groove presenting an expanding trend from the reduced mouth portion to the flared mouth portion, the reduced mouth portion being disposed proximate to the inner shell.

By adopting the technical scheme, when the sound waves are incident to the sound absorption part, most of the sound waves enter the grooves and are reflected and transmitted in the grooves, so that the sound waves are consumed.

Drawings

Fig. 1 is an overall cross-sectional view of a muffler according to an embodiment of the present utility model.

Fig. 2 is a schematic structural view of the inner shell in the embodiment of the present utility model.

Fig. 3 is an enlarged schematic view at a in fig. 1.

Fig. 4 is a schematic structural view for showing the positional relationship between the first noise reduction hole and the sound absorbing portion.

Reference numerals illustrate:

1. a housing; 11. a first chamber; 12. a second chamber; 13. a third chamber; 14. a communication passage; 2. an inner case; 21. a first noise reduction hole; 22. a second noise reduction hole; 23. a third noise reduction hole; 31. a first separator; 32. a second separator; 4. a sound absorbing layer; 41. a sound absorbing section; 411. a groove; 4111. a pinch portion; 4112. a flared portion.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-3.

The embodiment of the utility model discloses a silencer. Referring to fig. 1, the muffler is cylindrical as a whole, and comprises an outer shell 1 and an inner shell 2, wherein the outer shell 1 is sleeved on the inner shell 2, and a closed cavity is formed between the outer shell 1 and the inner shell 2; the length direction of the axis of the silencer is a first direction, two ends of the silencer along the first direction are respectively a first end and a second end, the first end is provided with a mounting structure, the silencer is connected with the turbocharger through the mounting structure, and waste gas passes through the inner shell 2 and flows to the second end from the first end of the silencer; a silencing structure is arranged in the closed cavity between the outer shell 1 and the inner shell 2, and can inhibit sound when the sound passes through the inner shell 2 along with the waste gas.

Referring to fig. 1 and 2, a first partition plate 31 and a second partition plate 32 are disposed in the closed cavity, and the first partition plate 31 and the second partition plate 32 are disposed between the first end and the second end of the muffler in a first direction, so that the closed cavity is divided into a first chamber 11, a second chamber 12 and a third chamber 13; the inner shell 2 is provided with a plurality of noise reduction holes, the noise reduction holes are respectively arranged corresponding to the first chamber 11, the second chamber 12 and the third chamber 13, and are respectively the first noise reduction hole 21, the second noise reduction hole 22 and the third noise reduction hole 23, when sound is transmitted along the first direction, sound waves can sequentially enter the first chamber 11, the second chamber 12 and the third chamber 13 through the noise reduction holes, and the noise reduction holes collide and refract with the outer shell 1 and the inner shell 2 for a plurality of times, so that the noise reduction purpose is achieved.

Referring to fig. 1 and 2, the first partition plate and the second partition plate are integrally formed with the inner shell 2, and one side of the first partition plate away from the inner shell 2 is attached to the inner wall of the outer shell 1, so that the first chamber 11 and the second chamber 12 are mutually independent; a gap is arranged between the side of the second partition plate away from the inner shell 2 and the outer shell 1, the gap is a communication channel 14, and the second chamber 12 and the third chamber 13 can be mutually communicated through the communication channel 14.

Referring to fig. 1 and 2, the first noise reduction holes 21 are elongated and extend along the circumferential direction of the inner casing 2, the length of the first noise reduction holes 21 is greater than three-fourths and less than one-half of the circumference of the outer wall of the inner casing 2, and the first noise reduction holes 21 are oppositely arranged in two and one group along the circumferential direction of the inner casing 2; the first noise reduction holes 21 are uniformly provided with four groups along the first direction by taking the groups as units, sound waves are primarily scattered and weakened when passing through the four groups of first noise reduction holes 21, then enter the first chamber 11 and are incident to the inner wall of the shell 1 body to be reflected, and the reflected sound waves interfere with the sound waves entering the first chamber 11, so that the purpose of noise reduction can be achieved.

Referring to fig. 1 and 2, the second noise reduction hole 22 is formed at a middle position of the second chamber 12 in the first direction, the second noise reduction hole 22 also extends in the circumferential direction of the inner case 2, two second noise reduction holes 22 are oppositely arranged in the circumferential direction of the inner case 2, the length of the second noise reduction hole 22 is smaller than that of the first noise reduction hole 21, and sound waves can enter the second chamber 12 through the second noise reduction hole 22. The third noise reduction holes 23 and the second noise reduction holes 22 have the same shape and size, two third noise reduction holes 23 are also formed along the circumferential direction of the inner shell 2, and sound waves can enter the third chamber 13 through the third noise reduction holes 23.

Referring to fig. 1 and 2, after noise is attenuated by the first chamber 11, the noise can enter the second chamber 12 through the second noise reduction hole 22 and be attenuated again, the attenuated sound wave can enter the third chamber 13 through the communication channel 14, during the noise transmission process, the sound wave is reflected on the inner wall of the housing 1, the reflected sound wave interferes with the sound wave entering the closed cavity through the second noise reduction hole 22 and the third noise reduction hole 23, and during the reflection and interference process, the sound wave is attenuated for multiple times.

Referring to fig. 1 and 3, in order to further improve the sound deadening effect of the muffler, particularly to suppress middle-high frequency noise, a sound absorbing layer 4 is provided in the first chamber 11, and the sound absorbing layer 4 may be fixed to the inner wall of the housing 1 by glue; the sound absorbing layer 4 comprises two sound absorbing parts 41, the sound absorbing parts 41 are rectangular, and the two sound absorbing parts 41 are oppositely arranged at two sides of the inner shell 2 and respectively correspond to the first noise reducing holes 21 at two sides of the inner shell 2; the four first noise reduction holes 21 that the same side of the inner shell 2 set up are corresponding to a sound absorption portion 41, and when noise passes through by the inner shell 2, sound waves can enter the first cavity 11 through the four first noise reduction holes 21 and are reflected on the sound absorption portion 41, so that the sound absorption portion 41 can absorb the noise in the middle-high frequency band better, and the noise reduction effect can be further improved.

Referring to fig. 3 and 4, in this embodiment, the sound absorbing layer 4 is made of a polyester fiber board, which has good sound absorbing and high temperature resistant properties; the sound absorbing portion 41 is provided with a plurality of grooves 411 on a surface close to the inner shell 2, specifically, the grooves 411 include a necking portion 4111 and a flaring portion 4112, the necking portion 4111 and the flaring portion 4112 are both in a circular hole shape, the aperture of the necking portion 4111 is smaller than that of the flaring portion 4112, and the necking portion 4111 is arranged close to the inner shell 2; after entering the flared portion 4112 through the necking portion 4111, the sound wave is transferred in the flared portion 4112 and vibrates with air in the flared portion 4112, so that part of sound energy is converted into heat energy, and the effect of noise consumption is achieved. The plurality of grooves 411 are uniformly distributed on the surface of the sound absorbing portion 41, thereby forming a porous structure, and the effect of absorbing and suppressing noise is better. In other application scenarios, the recess 411 may also be provided in a regular polygon shape.

The implementation principle of the silencer provided by the embodiment of the utility model is as follows: after the noise enters the inner shell 2, the sound wave enters the first cavity 11 from the first noise reduction hole 21 and collides with the sound absorption layer 4, the sound absorption layer 4 can absorb the middle and high frequency band part in the noise, and then the sound wave is reflected and interferes with the sound wave entering the first cavity 11 so as to weaken the noise; then sound waves enter the second chamber 12 and the third chamber 13 through the third noise reduction holes 23 of the second noise reduction holes 22, the sound waves are reflected and interfered in the second chamber 12 and the third chamber 13 in the same way, and the noise in the middle and low frequency bands can be weakened in the repeated reflection and interference processes, so that the noise reduction process of the noise in different frequency bands can be realized, and the noise reduction effect is better.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims

1. The utility model provides a muffler, includes shell (1) and inner shell (2), shell (1) cover is established on inner shell (2), form closed cavity, its characterized in that between shell (1) and inner shell (2): the sound-absorbing structure is characterized in that a first partition plate (31) and a second partition plate (32) are arranged outside the inner shell (2), the first partition plate (31) and the second partition plate (32) divide the closed cavity into a first cavity (11), a second cavity (12) and a third cavity (13) along the direction of sound transmission, noise-reducing holes are formed in the inner shell (2), and a sound-absorbing layer (4) is arranged in the first cavity (11).

2. The muffler of claim 1, wherein: the inner shell (2) is provided with a plurality of noise reduction holes, the noise reduction holes corresponding to the first cavity (11) are first noise reduction holes (21), the noise reduction holes corresponding to the second cavity (12) are second noise reduction holes (22), and the noise reduction holes corresponding to the third cavity (13) are third noise reduction holes (23); at least two first noise reduction holes (21) are arranged along the direction of sound transmission.

3. The muffler of claim 2, wherein: the noise reduction holes are arranged in a long strip shape.

4. The muffler of claim 2, wherein: the second chamber (12) and the third chamber (13) are respectively positioned at two sides of the second partition board (32), the second partition board (32) is connected to the inner shell (2), a gap is formed between the second partition board (32) and the outer shell (1), a communication channel (14) is formed, and the second chamber (12) and the third chamber (13) are communicated through the communication channel (14).

5. The muffler of claim 2, wherein: the sound absorbing layer (4) is attached to the shell (1) and is installed in a mode of corresponding to the first noise reduction hole (21).

6. The muffler of claim 5, wherein: the sound absorbing layer (4) comprises a plurality of sound absorbing parts (41), and the sound absorbing parts (41) are arranged adjacently at intervals.

7. The muffler of claim 6, wherein: the side surface of the sound absorbing part (41) close to the inner shell (2) is provided with a plurality of grooves (411).

8. The muffler of claim 7, wherein: the groove (411) comprises a shrinkage opening part (4111) and a flaring part (4112), the groove (411) is formed by the shrinkage opening part (4111) to show an expansion trend to the flaring part (4112), and the shrinkage opening part (4111) is arranged close to the inner shell (2).