CN114120946A

CN114120946A - Acoustic panel and noise reduction box

Info

Publication number: CN114120946A
Application number: CN202111536733.3A
Authority: CN
Inventors: 郭勇; 武伟涛; 赫明礼; 李宣秋; 肖娜
Original assignee: Shantui Chutian Construction Machinery Co Ltd
Current assignee: Shantui Chutian Construction Machinery Co Ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-03-01

Abstract

The invention relates to the technical field of sound-absorbing boards, and particularly discloses a sound-absorbing board and a noise reduction box, wherein the sound-absorbing board comprises a sound-absorbing board body and a sound-transmitting board, a plurality of sound absorbers are concavely arranged on the sound-absorbing board body at intervals, each sound absorber comprises a sound-deadening cavity and a sound-absorbing opening communicated with the sound-deadening cavity, and each sound-absorbing opening is of a necking structure; a plurality of through sound inlet holes are formed in the sound transmission plate at intervals, and the sound transmission plate is arranged at the sound absorption port and fixedly connected with the sound absorption plate body. The suction device and the sound-transmitting plate in the sound-absorbing plate can reduce the intensity of noise in the box body and cannot influence the high-efficiency work of equipment.

Description

Acoustic panel and noise reduction box

Technical Field

The invention relates to the technical field of sound-absorbing boards, in particular to a sound-absorbing board and a noise reduction box.

Background

The reason for the vibration of the gears is that when the gears are driven, the noise is repeatedly generated due to friction and contact generated during the operation process due to inevitable errors such as tooth pitch and tooth profile. The gear transmission noise exists for a long time, which not only affects the production environment, but also can cause harm to the personal health of operators, therefore, it is very important to find a reasonable method to reduce the gear transmission noise.

Based on the noise generated by mechanical transmission, the conventional noise reduction method is generally implemented by reducing the load, reducing the vibration frequency, reducing the gear friction and the like. However, these methods usually affect the transmission of power and the working efficiency of the equipment.

Disclosure of Invention

The invention aims to: the utility model provides an abatvoix and noise reduction box to solve among the relevant art can reduce the problem of the driven noise of gear in the gear box, do not influence the normal work of equipment again.

In one aspect, the present invention provides an acoustic panel comprising:

the sound absorption board comprises a sound absorption board body, wherein a plurality of sound absorbers are concavely arranged on the sound absorption board body at intervals, each sound absorber comprises a sound attenuation cavity and a sound absorption opening communicated with the sound attenuation cavity, and each sound absorption opening is of a necking structure;

the sound-transmitting plate is provided with a plurality of sound inlet holes which are communicated at intervals, and the sound-transmitting plate is arranged at the sound inlet and fixedly connected with the sound-absorbing plate body.

As the preferred technical scheme of the sound absorption plate, the sound attenuation cavity is of a curved surface structure.

As a preferable embodiment of the sound-absorbing panel, the sound-transmitting panel has elasticity.

As the preferable technical scheme of the sound absorption plate, the sound absorption plate further comprises a damping piece, wherein the damping piece comprises a plurality of elastic rods, and the elastic rods are fixedly arranged on the sound transmission plate at intervals and are positioned in the sound attenuation cavity.

As the preferred technical scheme of acoustic panel, the damper still includes a plurality of collision balls, and is a plurality of collision balls one-to-one rigid coupling is in a plurality of the elastic plate is kept away from the one end of sound transmission board.

As a preferable technical scheme of the sound absorption plate, the lengths of the elastic rods are different.

As the preferable technical scheme of the sound-absorbing board, a connecting lug is arranged on the sound-absorbing board body, and a bolt hole is formed in the connecting lug.

On the other hand, the invention provides a noise reduction box, and the sound absorption plate in any scheme is applied, and is fixed on the inner wall of the noise reduction box.

As the preferred technical scheme of the noise reduction box, the inner wall of the noise reduction box is concavely provided with a mounting groove, and the sound absorption board body is arranged in the mounting groove and abutted against the wall of the mounting groove.

As a preferred technical scheme of the noise reduction box, a connecting lug is arranged on the sound absorption plate body, and a bolt hole is formed in the connecting lug;

and the bolt penetrates through the bolt hole and is in threaded connection with the inner wall of the noise reduction box.

The invention has the beneficial effects that:

the invention provides an acoustic board, which comprises an acoustic board body and a sound transmission board, wherein a plurality of sound absorbers are concavely arranged on the acoustic board body at intervals, each sound absorber comprises a sound attenuation cavity and a sound absorption port communicated with the sound attenuation cavity, and each sound absorption port is of a necking structure; a plurality of through sound inlet holes are formed in the sound transmission plate at intervals, and the sound transmission plate is arranged at the sound absorption port and fixedly connected with the sound absorption plate body. When producing the noise in the box, on the abatvoix body of setting at the box inner wall was propagated to the noise in the box, the noise entered the amortization chamber through the sound inlet hole on the sound-transmitting plate, and the noise that is arranged in the amortization chamber constantly reflects in the chamber wall, and most noise is at constantly reflecting the in-process, and along with the loss of energy and disappearance gradually. In the process of reflecting noise in the silencing cavity, some noise can be emitted to the sound absorption port, and the sound transmission plate can block part of the noise emitted to the sound absorption port. Therefore, the device can reduce the intensity of noise in the box body under the condition of not changing the performance of equipment.

Drawings

FIG. 1 is a top view of an acoustic panel in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an acoustic panel in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an acoustic panel according to an embodiment of the present invention;

FIG. 4 is a schematic view showing the structure of a sound absorber, a sound-transmitting panel and a shock-absorbing member according to an embodiment of the present invention;

FIG. 5 is a first schematic view illustrating the assembly of the inner wall of the noise reduction box and the sound-absorbing plate according to the embodiment of the invention;

FIG. 6 is a second schematic view illustrating the assembly of the inner wall of the noise reduction box and the sound-absorbing board in the embodiment of the present invention.

In the figure:

1. a sound-absorbing panel body; 11. a sound absorber; 111. a sound-deadening chamber; 112. a sound absorption port; 12. connecting lugs; 121. bolt holes;

2. a sound-transmitting panel; 21. a sound inlet hole;

3. a shock absorbing member; 31. an elastic rod; 32. a collision ball;

4. the inner wall of the noise reduction box; 41. and (4) mounting the groove.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The box body is made of cast iron, sound of the box body is mainly caused by excitation of a transmission part, a gear meshing area is a box body excitation source, part of generated sound energy is transmitted to a shaft through solid-state sound and then transmitted to a box wall, and the other part of the generated sound energy is transmitted through air.

As shown in fig. 1 to 4, the present embodiment provides a sound-absorbing panel, which includes a sound-absorbing panel body 1 and a sound-transmitting panel 2, wherein a plurality of sound absorbers 11 are concavely disposed on the sound-absorbing panel body 1 at intervals, each sound absorber 11 includes a sound-deadening cavity 111 and a sound-absorbing opening 112 communicating with the sound-deadening cavity 111, and the sound-absorbing opening 112 is of a throat structure; a plurality of sound inlet holes 21 are formed in the sound transmitting plate 2 at intervals, and the sound transmitting plate 2 is arranged at the sound absorbing port 112 and is fixedly connected with the sound absorbing plate body 1. When noise is generated in the box body, the noise in the box body is transmitted to the sound absorption board body 1 arranged on the inner wall of the box body, the noise enters the sound attenuation cavity 111 through the sound inlet hole 21 on the sound transmission board 2, the noise in the sound attenuation cavity 111 is continuously reflected in the cavity wall, and most of the noise disappears gradually along with energy loss in the continuous reflection process. While the noise is reflected in the sound-deadening chamber 111, there is some noise directed to the sound-absorbing port 112, and the sound-transmitting panel 2 can block part of the noise directed to the sound-absorbing port 112. Therefore, the device can reduce the intensity of noise in the box body under the condition of not changing the performance of equipment.

Specifically, in order to prevent noise in the sound-deadening chamber 111 from being emitted from the sound-absorbing port 112, the sound-absorbing port 112 is optionally provided in a throat structure. In this embodiment, the sound-absorbing opening 112 is formed in a constricted structure, which reduces the transmission of noise from the sound-absorbing opening 112, which is located in the sound-deadening chamber 111.

Meanwhile, in order to prevent the noise in the sound-deadening chamber 111 from being emitted to the sound-absorbing opening 112, the sound-deadening chamber 111 has a curved surface structure, in this embodiment, the sound wave can be reduced from flowing out from the sound-absorbing opening 112 by setting the sound-deadening chamber 111 to have the curved surface structure, and specifically, the curved surface parameter is related to the noise sound wave and needs to be calculated specifically. Preferably, the sound-deadening chamber 111 is a jar-shaped structure, and when sound waves enter the structure, the sound waves can be transmitted in the sound-deadening chamber 111 and are not easy to be transmitted from the sound-absorbing opening due to the small opening and the large chamber body.

Optionally, the sound-transmitting panel 2 is elastic. In this embodiment, since the sound-transmitting panel 2 has elasticity, when sound waves act on the sound-transmitting panel 2, the sound-transmitting panel 2 vibrates. And the sound-transmitting panel 2 can convert part of the sound wave energy into vibration. And part of the noise can be consumed. Meanwhile, in the long-term use process, impurities such as dust easily enter the sound inlet hole 21 of the sound transmission plate 2, but the sound transmission plate 2 can vibrate under the action of sound waves, so that the sound transmission plate 2 can vibrate the impurities such as dust in the sound inlet hole 21 out of the sound inlet hole 21, and further ensure that noise can smoothly enter the sound attenuation cavity 111 from the sound inlet hole 21.

Alternatively, the sound-transmitting panel 2 is a sheet structure having elasticity. In this embodiment, the sound-transmitting panel 2 is a thin sheet structure having elasticity, and can vibrate slightly under the driving of noise.

For the specific material of the sound transmission plate 2, optionally, the sound transmission plate 2 is made of calcium silicate material, in this embodiment, since the inside of the box body is a high-temperature and humid environment, in order to ensure the normal operation of the sound transmission plate 2, the sound transmission plate 2 is made of calcium silicate, which has the functions of fire prevention and moisture prevention.

Since the noise generation and the vibration are inseparable, the noise generation can be further reduced by reducing the vibration. Optionally, to further enhance the noise reduction effect of the sound-absorbing panel. The sound absorbing plate further comprises a damping member 3, the damping member 3 comprises a plurality of elastic rods 31, and the plurality of elastic rods 31 are fixedly arranged on the sound transmitting plate 2 at intervals and are positioned in the sound attenuation cavity 111. In this embodiment, when the box takes place to vibrate, abatvoix body 1 can be along with the box together vibrates, and then abatvoix body 1 drives the elastic rod 31 that is located on sound transmission plate 2 and vibrates, because elastic rod 31 has elasticity, so elastic rod 31 takes place the in-process of deformation and can collide each other, and this in-process again, elastic rod 31 can produce reverse vibration, and then absorbs partial abatvoix body 1's vibration, and then noise reduction.

To further increase the magnitude of the deformation of the elastic rod 31, the shock absorbing capability of the elastic rod 31 is increased. The damping member 3 further includes a plurality of collision balls 32, and the collision balls 32 are fixedly connected to one end of the elastic rods 31 far away from the sound-transmitting plate 2. In this embodiment, the elastic rod 31 is driven by the collision ball 32 to swing to a large extent, and in this process, the collision ball 32 and the elastic rod 31 fixedly connected thereto collide with the adjacent collision ball 32 and the elastic rod 31 fixedly connected thereto, so that part of vibration energy can be absorbed, and noise generated by vibration can be reduced.

As for the length of the elastic rod 31, alternatively, the lengths of the plurality of elastic rods 31 are different from each other. In this embodiment, since the noise reduction box has different vibration frequencies, the vibration frequencies transmitted to the sound-absorbing panel body 1 are also different, and therefore, the elastic plates 31 having different lengths can absorb the vibrations of different frequencies on the noise reduction box. Meanwhile, the arrangement can ensure that the arrangement density of the shock absorbing members 3 is increased under the condition that a plurality of shock absorbing members 3 are spaced from each other.

Note also that the collision ball 32 and the elastic rod 31 are provided on the sound transmitting plate 2 at an interval, and thus the sound waves in the sound deadening chamber 111 can be blocked from being emitted from the sound inlet hole 21.

In order to facilitate the installation of the sound-absorbing plate, optionally, the sound-absorbing plate body 1 is provided with a connecting lug 12, and the connecting lug 12 is provided with a bolt hole 121. In this embodiment, the engaging lug 12 can be fixed to the member to be sound-insulated by a bolt.

Alternatively, the sound-absorbing panel body 1 is integrally formed. In this embodiment, the sound-absorbing plate body 1 may be manufactured by a casting or 3D printing process, and in other embodiments, the sound-absorbing plate may be manufactured by digging the sound absorbers 11 on a flat plate.

As shown in fig. 5 and 6, the present embodiment also provides a noise reduction box, which comprises the sound-absorbing board of the above scheme, and the sound-absorbing board is fixed on the inner wall 4 of the noise reduction box. Noise generated in the noise reduction box can be absorbed by the sound-absorbing plate fixed to the inner wall 4 of the noise reduction box.

In order to prevent that the sound-absorbing board can occupy the volume inside the noise reduction box after the noise reduction box is attached with the sound-absorbing board, optionally, the noise reduction box inner wall 4 is concavely provided with a mounting groove 41, and the sound-absorbing board body 1 is arranged in the mounting groove 41 and is abutted against the groove wall of the mounting groove 41. In this embodiment, the noise reduction box inner wall 4 is concavely provided with a mounting groove 41, and the sound absorption board body 1 is directly mounted in the mounting groove 41. The acoustic panel body 1 does not occupy the original volume in the noise reduction box.

For the processing of the mounting groove 41, the mounting groove 41 can be directly dug on the inner wall 4 of the noise reduction box, or the mounting groove 41 can be released and reserved in an injection molding process when the noise reduction box is processed.

As to how the sound-absorbing board body 1 is fixed in the mounting groove 41, optionally, the sound-absorbing board body 1 is provided with a connecting lug 12, and the connecting lug 12 is provided with a bolt hole 121; the bolt passes through the bolt hole 121 and is screwed with the noise reduction box inner wall 4. In other embodiments, the connecting lug 12 may be fixed to the noise reduction box inner wall 4 by riveting.

As for the thickness of the noise reduction box inner wall 4, optionally, the thickness of the noise reduction box inner wall 4 is 10 mm. In this embodiment, since the sound absorption performance of the noise reduction box inner wall 4 is closely related to the thickness of the material, if the material is too thin, the sound absorption effect cannot be effectively achieved. The conditions to be absorbed are different because of the different frequencies of sound. High frequency sounds are short in wavelength and can be easily absorbed, while low frequency sounds are long in wavelength and can easily penetrate through obstacles. For low frequency sounds, it is difficult not only to insulate sound but also to absorb it. However, as long as the material thickness of the inner wall of the case is sufficient, low frequencies above 130Hz can be absorbed. Therefore, to achieve a desired sound absorption effect, the thickness of the inner wall of the cabinet is at least greater than 10mm, otherwise the cabinet cannot be used as a sound absorption structure.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An acoustic panel, comprising:

the sound absorption board comprises a sound absorption board body (1), wherein a plurality of sound absorbers (11) are concavely arranged on the sound absorption board body (1) at intervals, each sound absorber (11) comprises a silencing cavity (111) and a sound absorption opening (112) communicated with the silencing cavity (111), and each sound absorption opening (112) is of a necking structure;

the sound-absorbing plate comprises a sound-transmitting plate (2), wherein a plurality of sound inlet holes (21) which are communicated with each other are formed in the sound-transmitting plate (2) at intervals, and the sound-transmitting plate (2) is arranged at a sound-absorbing opening (112) and fixedly connected with a sound-absorbing plate body (1).

2. The sound-absorbing panel as claimed in claim 1, characterized in that said muffling chamber (111) is of curved configuration.

3. The sound-absorbing panel according to claim 1, characterized in that said sound-transmitting panel (2) is elastic.

4. The sound-absorbing panel according to claim 1, further comprising a shock-absorbing member (3), said shock-absorbing member (3) comprising a plurality of elastic rods (31), said plurality of elastic rods (31) being fixed at intervals to said sound-transmitting panel (2) and being located inside said sound-deadening chamber (111).

5. The sound-absorbing panel according to claim 4, wherein said shock-absorbing member (3) further comprises a plurality of impact balls (32), and said impact balls (32) are fixedly connected to one end of said elastic rods (31) away from said sound-transmitting panel (2) in a one-to-one correspondence.

6. The sound-absorbing panel according to claim 4, characterized in that said plurality of elastic bars (31) are all of different lengths.

7. The sound-absorbing panel as claimed in claim 1, wherein the sound-absorbing panel body (1) is provided with attachment lugs (12), and the attachment lugs (12) are provided with bolt holes (121).

8. A noise damping box, characterized in that it uses the sound-absorbing panel according to any one of claims 1-7, which is fixed to the inner wall (4) of the box.

9. The noise reduction box according to claim 8, wherein the noise reduction box inner wall (4) is concavely provided with a mounting groove (41), and the sound absorption board body (1) is arranged in the mounting groove (41) and is abutted with the groove wall of the mounting groove (41).

10. The noise reduction box according to claim 9, characterized in that said sound-absorbing panel body (1) is provided with coupling lugs (12), said coupling lugs (12) being provided with bolt holes (121);

and the bolt penetrates through the bolt hole (121) and is in threaded connection with the inner wall (4) of the noise reduction box.