CN214616729U

CN214616729U - Novel multilayer impedance gradual change composite sound absorption structure

Info

Publication number: CN214616729U
Application number: CN202022627662.5U
Authority: CN
Inventors: 许平洋; 潘海彬; 游余林; 董非; 王金兰
Original assignee: Jiangsu Bona Automobile Components Co ltd
Current assignee: Jiangsu Bona Automobile Components Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-11-05
Anticipated expiration: 2030-11-13

Abstract

The utility model discloses a novel multilayer impedance gradual change composite sound absorption structure, which comprises an air inlet pipeline, an air outlet pipeline and an impedance sound absorption structure; the impedance sound absorption structure comprises a silencing sleeve, a sound insulation plate and a sound absorption sheet ring; the silencing sleeve is sleeved on the periphery of the pipeline along the length direction of the pipeline, the inner wall of the silencing sleeve is divided into a plurality of annular steps in a stepped manner, and the annular steps divide the silencing sleeve into a plurality of step cavities; a plurality of sound release pipes are arranged on the periphery of the pipeline and are perpendicular to the pipe wall, and a plurality of through holes are formed on the periphery of each sound release pipe; the sound release pipe is arranged at the boundary of the adjacent ring step steps; the sound insulation boards and the sound absorption sheet rings are arranged inside the silencing sleeve, and the sound insulation boards and the sound absorption sheet rings are sequentially and alternately sleeved on the pipeline along the length direction of the pipeline; the sound insulation plate is arranged in the step cavity, and the sound absorption sheet ring is arranged at the boundary of adjacent ring step steps and wraps the sound leakage pipe; the hexagonal honeycomb arrangement sound-resisting holes are arranged, so that the noise can be reflected for multiple times, and the noise absorption effect is improved.

Description

Novel multilayer impedance gradual change composite sound absorption structure

Technical Field

The utility model relates to a technical field of making an uproar falls especially relates to a novel compound sound absorbing structure of multilayer impedance gradual change.

Background

The sound absorption technology is widely applied to various fields of industrial products, transportation, national defense, civil buildings and the like, and is mainly applied to environmental protection sound absorption and noise reduction and sound quality control of architectural acoustics from the aspect of acoustics. Since the fifties of the twentieth century, particularly the seventies, in China, along with the development of economy, the noises of industry, traffic, construction and the like are higher and higher, noise pollution is formed, the noises become one of three public hazards, and the gradual attention of all aspects is attracted. The domestic successively developed or introduced foreign advanced sound-absorbing material and structure and applied to engineering practice makes sound-absorbing technology developed rapidly. At present, the requirements of sound absorption materials and structures in the market are that the original main characteristics of high sound absorption coefficient and convenient installation are achieved, factors such as attractive appearance, environment-friendly materials, fire prevention, dust prevention and the like are important considered, and the sound absorption materials especially suitable for special frequency characteristic sound fields have great requirements.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the deficiencies in the prior art, the utility model provides a novel compound sound absorbing structure of multilayer impedance gradual change can effectively reduce engine noise.

The technical scheme is as follows: in order to achieve the above object, the utility model discloses a novel multilayer impedance gradual change composite sound absorption structure, which comprises an air inlet pipeline, an air outlet pipeline and an impedance sound absorption structure; the air inlet pipeline is communicated with the impedance sound absorption structure through a corrugated pipe, and the air outlet end of the impedance sound absorption structure is connected with the air inlet end of the air outlet pipeline; the impedance sound absorption structure comprises a silencing sleeve, a sound insulation plate and a sound absorption sheet ring; the silencing sleeve is sleeved on the periphery of the pipeline along the length direction of the pipeline, the inner wall of the silencing sleeve is divided into a plurality of annular steps in a stepped manner, and the annular steps divide the silencing sleeve into a plurality of step cavities; a plurality of sound release pipes are arranged on the periphery of the pipeline and are perpendicular to the pipe wall, and a plurality of through holes are formed on the periphery of each sound release pipe; the sound release pipe is arranged at the boundary of the adjacent ring step steps; the sound insulation boards and the sound absorption sheet rings are arranged inside the silencing sleeve, and the sound insulation boards and the sound absorption sheet rings are sequentially and alternately sleeved on the pipeline along the length direction of the pipeline; the acoustic celotex board is located rank intracavity portion, sound absorbing sheet circle is located adjacent ring steps boundary department and is wrapped up and let out the sound pipe.

Furthermore, the sound insulation board is provided with a plurality of sound resisting holes; the sound resisting holes are arranged along the radius direction of the sound insulation board to form a sound resisting hole group, and the sound resisting hole groups are annularly arranged along the circumferential direction of the sound insulation board; the sound resisting hole is of a hexagonal structure, the inner wall of the sound resisting hole is provided with six sound absorbing surfaces, the sound absorbing surfaces are provided with square grooves, and a plurality of square pipes are arranged inside the square grooves; the square pipe orifice is perpendicular to the bottom of the square groove, and the sound-absorbing material is filled inside the square pipe.

Furthermore, the adjacent sound insulation boards are arranged in a rotating angle mode, so that the sound resisting holes of the adjacent sound insulation boards are not in positive correspondence.

Furthermore, the lengths of the sound leaking pipes are gradually reduced along the flow direction of the gas in the pipeline; the through-hole is embedded to have the foil, foil reduces to interior circle direction thickness from the outer lane gradually, open at the foil center has the air vent.

Has the advantages that: the utility model discloses a novel multilayer impedance gradual change composite sound absorption structure which can effectively reduce the noise of an engine; including but not limited to the following technical effects:

1) the noise insulation board can block the reflected noise and prevent the noise from propagating along a straight line, thereby reducing the noise;

2) through setting up the anti sound hole and adopting plane inner wall, hexagonal honeycomb arranges and can make the noise multiple reflection in finite space, improves the noise absorption effect.

Drawings

FIG. 1 is a structural diagram of the present invention;

fig. 2 is a structural diagram of the impedance sound absorption structure of the present invention;

FIG. 3 is a structural diagram of the sound-resisting hole of the present invention;

fig. 4 is a structural diagram of the sound venting pipe of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in figures 1-4: a novel multilayer impedance gradual change composite sound absorption structure comprises an air inlet pipeline 51, an air outlet pipeline 52 and an impedance sound absorption structure; the air inlet pipeline 51 is communicated with the impedance sound absorption structure through a corrugated pipe, and the air outlet end of the impedance sound absorption structure is connected with the air inlet end of the air outlet pipeline 52; the impedance sound absorption structure comprises a silencing sleeve 1, a sound insulation plate 2 and a sound absorption sheet ring 3; the silencing sleeve 1 is sleeved on the periphery of the pipeline 4 along the length direction of the pipeline 4, the inner wall of the silencing sleeve 1 is divided into a plurality of annular steps 11 in a stepped manner, and the silencing sleeve 1 is divided into a plurality of step cavities 12 by the annular steps 11; a plurality of sound release pipes 41 are arranged on the periphery of the pipeline 4 and are perpendicular to the pipe wall, and a plurality of through holes 42 are formed on the periphery of each sound release pipe 41; the sound release pipe 41 is arranged at the step boundary of the adjacent ring steps 11; the sound insulation boards 2 and the sound absorption sheet rings 3 are arranged inside the silencing sleeve 1, and the sound insulation boards 2 and the sound absorption sheet rings 3 are alternately sleeved on the pipeline 4 in sequence; the sound insulation board 2 is arranged in the step cavity 12, and the sound absorbing sheet ring 3 is arranged at the step boundary of the adjacent ring step 11 and wraps the sound leakage pipe 41;

the sound absorption sheet ring 3 adopts sound absorption materials with different densities, the structure adopts a three-layer or more-layer composite mode, loose sound absorption materials are firstly placed, then the most compact sound absorption materials are placed in front of the loose sound absorption materials, then the loose sound absorption materials are placed in front of the most compact sound absorption materials, after the arrangement is finished, a protective layer protection structure is added outside the first layer of sound absorption materials to form the loose-compact-loose type multilayer composite sound absorption materials, the market multilayer composite sound absorption structure adopts the most compact sound absorption materials to be placed on the outermost layer, when the loose sound absorption materials are arranged on the back of the dense-loose type multilayer composite sound absorption materials, the low-frequency sound absorption effect is very good, but the medium-high frequency sound absorption performance is very poor, the multilayer composite sound absorption structure researched and developed by the project adopts the loose-compact-loose type multilayer composite sound absorption materials, and has good sound absorption performance at low frequency, the high-frequency sound absorption effect is ensured;

experimental research shows that: the frequency of the sound absorption peak value of the 'compact-loose' type composite sound absorption material is about 500Hz, the frequency of the sound absorption peak value of the 'loose-compact-loose' type multilayer composite sound absorption material is about 800Hz, the low-frequency sound absorption performance of the 'compact-loose' type multilayer composite sound absorption material is better than that of the 'loose-compact-loose' type multilayer composite sound absorption material, but the high-frequency sound absorption effect is poor, and the sound absorption coefficient is reduced along with the increase of the frequency;

the frequency of the sound absorption peak value of the loose-compact multilayer composite sound absorption material is near 1300Hz, and the frequency of the sound absorption peak value of the test using the loose-compact-loose multilayer composite sound absorption material is reduced by about 500Hz compared with the former, the low-frequency sound absorption bandwidth is higher than that of the loose-compact multilayer composite sound absorption material, and the sound absorption coefficient is also higher.

The ring step 11 can divide the interior of the silencing sleeve 1 into a plurality of sub-cavities in stages, and different gradients reflect and absorb noises with different frequencies, so that the application range of the silencer is expanded; the noise in the pipeline 4 is firstly transmitted to the sound absorbing sheet ring 3 through the through hole 42 of the sound leakage pipe 41 and absorbed with partial energy, then enters the step cavity 12 and is reflected by a plurality of edges of the ring step 11, the reflected noise is transmitted to the sound absorbing sheet ring 3 again, and the efficiency of absorbing the noise can be effectively improved; the baffle 2 can block and reflect the noise in the cavities 12 with different orders, and a blocking surface is manufactured in the space as much as possible to prevent the noise from propagating along a straight line.

The sound insulation board 2 is provided with a plurality of sound resisting holes 21; the sound resisting holes 21 are arranged along the radius direction of the sound insulation board 2 to form sound resisting hole groups, and the sound resisting hole groups are annularly arranged along the circumferential direction of the sound insulation board 2; the sound resisting hole 21 is of a hexagonal structure, the inner wall of the sound resisting hole 21 is provided with six sound absorbing surfaces 211, the sound absorbing surfaces 211 are provided with square grooves 212, and a plurality of square pipes 213 are arranged inside the square grooves 212; the pipe orifice of the square pipe 213 is vertical to the bottom of the square groove 212, and the sound-absorbing material is filled in the square pipe 213; the sound resisting holes 21 are plane inner walls, compared with curved walls, noise can be better reflected, and due to the hexagonal honeycomb arrangement, the noise can be reflected for multiple times in a limited space, so that the noise absorption effect is improved; the square groove 212 and the square tube 213 increase a reflection surface. Further improving the sound absorption capacity.

The adjacent sound insulation boards 2 are arranged in a rotating angle manner, so that the sound resisting holes 21 of the adjacent sound insulation boards 2 are not in positive correspondence; adjacent sound insulation board 2 staggers and puts and can make the noise in the space can't follow straight line remote propagation, makes more blockings in the noise propagation direction, improves noise reduction effect.

The lengths of the sound leaking pipes 41 are gradually reduced along the flow direction of the gas in the pipeline 4; a metal sheet 421 is embedded in the through hole 42, the thickness of the metal sheet 421 gradually decreases from the outer ring to the inner ring, and a vent 422 is formed in the center of the metal sheet 421; when noise enters the sound discharging pipe 41 from the pipeline 4, the energy is highest, so that the noise firstly passes through the metal sheet 421 and makes the metal sheet vibrate to consume part of the energy, the material of the central part of the metal sheet 421 is the thinnest, the vibration is most easily generated, and the noise energy can be consumed by continuously absorbing the noise and vibrating.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a novel compound sound absorbing structure of multilayer impedance gradual change which characterized in that: comprises an air inlet pipeline (51), an air outlet pipeline (52) and an impedance sound absorption structure; the air inlet pipeline (51) is communicated with the impedance sound absorption structure through a corrugated pipe, and the air outlet end of the impedance sound absorption structure is connected with the air inlet end of the air outlet pipeline (52); the impedance sound absorption structure comprises a silencing sleeve (1), a sound insulation plate (2) and a sound absorption sheet ring (3); the silencing sleeve (1) is sleeved on the periphery of the pipeline (4) along the length direction of the pipeline (4), the inner wall of the silencing sleeve (1) is divided into a plurality of annular steps (11) in a stepped mode, and the silencing sleeve (1) is divided into a plurality of step cavities (12) by the annular steps (11); a plurality of sound release pipes (41) are arranged on the periphery of the pipeline (4) and are perpendicular to the pipe wall, and a plurality of through holes (42) are formed on the periphery of each sound release pipe (41); the sound release pipe (41) is arranged at the step boundary of the adjacent ring steps (11); the sound insulation boards (2) and the sound absorption sheet rings (3) are arranged inside the silencing sleeve (1), and the sound insulation boards (2) and the sound absorption sheet rings (3) are sequentially and alternately sleeved on the pipeline (4) along the length direction of the pipeline (4); inside rank chamber (12) were located in acoustic celotex board (2), sound absorbing sheet circle (3) are located adjacent ring rank (11) step boundary department and are wrapped up and let out sound pipe (41).

2. The novel multilayer impedance gradual change composite sound absorbing structure of claim 1, wherein: the sound insulation board (2) is provided with a plurality of sound resisting holes (21); the sound resisting holes (21) are arranged along the radius direction of the sound insulation board (2) to form sound resisting hole groups, and the sound resisting hole groups are annularly arranged along the circumferential direction of the sound insulation board (2); the sound resisting hole (21) is of a hexagonal structure, the inner wall of the sound resisting hole (21) is provided with six sound absorbing surfaces (211), the sound absorbing surfaces (211) are provided with square grooves (212), and a plurality of square pipes (213) are arranged inside the square grooves (212); the mouth of the square pipe (213) is perpendicular to the bottom of the square groove (212), and the square pipe (213) is filled with sound-absorbing material.

3. The novel multilayer impedance gradual change composite sound absorbing structure of claim 2, wherein: the sound insulation boards (2) are arranged at a rotating angle, so that the sound resisting holes (21) of the adjacent sound insulation boards (2) are not in positive correspondence.

4. The novel multilayer impedance-grading composite sound absorbing structure as claimed in claim 1, wherein: the lengths of the sound leakage pipes (41) are gradually reduced along the flowing direction of the gas in the pipeline (4); the through-hole (42) is embedded to have foil (421), foil (421) from the outer lane to interior circle direction thickness taper reduction, open at foil (421) center has air vent (422).