CN210052517U

CN210052517U - Acoustic radial silencing unit, silencing module and silencing structure

Info

Publication number: CN210052517U
Application number: CN201920536727.XU
Authority: CN
Inventors: 陈兴
Original assignee: Sichuan Wuhuan Petrochemical Equipment Co Ltd
Current assignee: Sichuan Wuhuan Petrochemical Equipment Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2020-02-11
Anticipated expiration: 2029-04-19

Abstract

The utility model provides a radial amortization unit of acoustics, amortization module and amortization structure, the amortization unit includes: the first orifice plate is provided with at least one first hole; the second orifice plate is provided with at least one second hole and is arranged opposite to the first orifice plate; the side wall, the first pore plate and the second pore plate are combined together to form a flat hollow cavity structure; the structural size of the silencing cavity satisfies the relation: d is more than or equal to 0.8L, D is more than L, and D/D is more than or equal to 2.0, wherein D is the equivalent size of the first hole or the second hole, D is the equivalent size of the cross section of the main body of the silencing cavity, and L is the equivalent length of the main body of the silencing cavity. The utility model discloses be a platykurtic with the compression of traditional amortization unit to with the exit equivalent dimension of amortization chamber, the equivalent dimension of cross section, the equivalent length in amortization chamber carries out the data optimization back, has reduced fluid pressure loss, has increased low frequency noise's transmission loss, has formed a amortization unit who is fit for low frequency noise.

Description

Acoustic radial silencing unit, silencing module and silencing structure

Technical Field

The utility model relates to an amortization technical field, in particular to amortization unit and module suitable for low frequency noise.

Background

Low frequency noise generally refers to sound having a frequency of 200 hertz (octave) or less, and mainly relates to a compressor, an exhaust fan, a blower, a cooling tower, a boiler, a chiller, a transformer, a washing machine, a refrigerator, an automobile, an iron bridge, a tunnel, and the like.

For low frequency noise, such as 50Hz sound having a wavelength of 6.8m, below this 50Hz, the acoustic absorption coefficient of typical acoustic materials is low and the amount of sound insulation is low. If a higher sound-deadening volume is required, the thickness of the sound-absorbing material is required to be increased greatly, which inevitably results in a relatively bulky acoustic structure that is difficult to implement. In recent years, although the invention of acoustic metamaterials, such as the patent named acoustic energy absorption metamaterial (with the application number of CN201210490610.5), has made a better improvement on low-frequency noise reduction, the structures have high manufacturing cost, fragile structures and narrow frequency ranges.

As can be seen from the above, in the prior art, in order to increase the noise reduction amount of low frequencies, conventionally, the length of the noise reduction cavity is increased greatly, or the noise reduction amount of the wide frequency range of the noise reducer is increased by increasing the number of bent barriers of the internal channel of the noise reducer with multiple cavities, but this will make the length of the noise reducer very long or very high, which will consume materials, increase the manufacturing cost of the noise reducer, and increase the transportation and installation costs. Too prominent muffler height also increases the difficulty of resisting strong wind pressure, causes structural instability. The multi-chamber design also greatly increases fluid pressure loss.

Disclosure of Invention

The utility model aims at developing a amortization unit that is suitable for low frequency noise, it is little to make it have fluid pressure loss, stable in structure, low cost's advantage.

The utility model discloses a following technical scheme realizes:

an acoustic radial muffler unit comprising:

a first orifice plate having at least one first orifice therein;

the second orifice plate is provided with at least one second hole and is arranged opposite to the first orifice plate;

the side wall is positioned between the first orifice plate and the second orifice plate and is combined with the first orifice plate and the second orifice plate to form a flat hollow cavity structure, and a silencing cavity is formed inside the hollow cavity structure;

the structural size of the silencing cavity satisfies the relation: d is more than or equal to 0.8L, D is more than L, and D/D is more than or equal to 2.0, wherein D is the equivalent size of the first hole or the second hole, D is the equivalent size of the cross section of the main body of the silencing cavity, and L is the equivalent length of the main body of the silencing cavity.

In an alternative embodiment, the cross section of the cavity structure is circular, and the first hole and the second hole are also circular.

In an alternative embodiment, at least one of said first holes is arranged concentrically with at least one of said second holes.

In an optional embodiment, the sound-deadening unit further comprises a perforated pipe, the perforated pipe is connected between the first hole and the second hole, and is provided with a plurality of perforations for communicating the perforated pipe with the sound-deadening chamber, the aperture of each perforation is 3mm-6mm, and the perforation rate of each perforation is 40% -50%.

The silencing module at least comprises more than one acoustic radial silencing units, the acoustic radial silencing units are sequentially connected in series and assembled together, and the holes among the silencing units correspond to each other. The holes are a first hole and a second hole.

In an alternative embodiment, the acoustic radial silencing units are assembled in series from small to large according to a rule.

The acoustic radial silencing unit is integrally embedded and installed in the building wall to form the silencing structure; or the silencing module is partially or completely embedded and installed in the building wall.

The utility model has the advantages that:

1. the utility model discloses be a platykurtic with the compression of traditional amortization unit to with the maximum dimension of the exit size of amortization chamber, cross section, the length in amortization chamber carries out the data optimization back, has reduced fluid pressure loss, has increased low frequency noise's transmission loss, has formed a amortization unit who is fit for low frequency noise.

2. The utility model connects the silencing units in series to form a silencing module, which has the characteristics of wide frequency and high silencing volume, and the silencing bandwidth can exceed 3 frequency doubling bands; low cost and wide application range.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a view showing a structure of a conventional muffler;

FIG. 2 is a schematic structural diagram of an embodiment of a muffler unit of the present application;

FIG. 3 is a schematic structural diagram of another embodiment of a muffler unit according to the present application;

FIG. 4 is a schematic structural diagram of another embodiment of a muffler unit according to the present application;

FIG. 5 is a schematic structural diagram of a silencer module according to the present application;

FIG. 6 is an experimental diagram of an acoustic simulation of the sound attenuating unit of the present application;

FIG. 7 is a graph of an acoustic simulation experiment comparing a muffler unit of the present application with a conventional muffler unit of the prior art;

fig. 8 is an acoustic simulation test chart of the silencer module of the present application.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, in the design of the conventional reactive muffler or resistive muffler, the ratio of the length L of the main body of the muffling chamber to the diameter d of the inlet and outlet of the muffling chamber, i.e., L/d >1, especially to increase the amount of low-frequency muffling, the length L of the main body of the muffling chamber is conventionally increased greatly, or the amount of bending and blocking of the internal channel of the muffler is increased by using multiple chambers to increase the amount of muffling in the wide frequency range of the muffler, but this will make the length of the muffler very long or very high, which consumes materials, increases the manufacturing cost of the muffler, and also increases the transportation and installation cost. Too prominent muffler height also increases the difficulty of resisting strong wind pressure, causes structural instability. The multi-chamber design also greatly increases fluid pressure loss, will significantly reduce the efficiency of the engine or blower,

the acoustic radial muffler unit 100 disclosed in the embodiments of the present application, referring to fig. 2, the muffler unit 100 is in a regular shape,

the method comprises the following steps:

a first orifice plate 10 having at least one first orifice 11 therein;

a second orifice plate 20 having at least one second orifice 21 and disposed opposite to the first orifice plate 10;

and the side wall 30 is located between the first orifice plate 10 and the second orifice plate 20, and combines with the first orifice plate 10 and the second orifice plate 20 to form a flat hollow cavity structure, and a sound attenuation cavity is formed inside the hollow cavity structure.

In this embodiment, the cross section of the cavity structure is circular, and the first hole 11 and the second hole 21 are also circular.

It is understood that in an alternative embodiment, there is at least one first hole 11, and similarly, there is at least one second hole 21, and the first hole 11 and the second hole 21 are all or partially arranged concentrically. Fig. 2 shows only one embodiment in which the first holes 11 and the second holes 21 are concentrically arranged, and other variations that are equally extendable by those skilled in the art in light of the above-mentioned drawings, such as the structure shown in fig. 3, in which the number of the first holes 11 is one, and the number of the second holes 21 is three, will not be repeated.

Referring to fig. 3, in a preferred embodiment, the sound-deadening unit 100 further includes a perforated pipe 40, the perforated pipe 10 is connected between the first hole 11 and the second hole 21, and has a plurality of perforations communicating the perforated pipe 40 with the sound-deadening chamber, the diameter of the perforations is 3mm to 6mm, and the perforation rate of the perforations is 40% to 50%.

It will be appreciated that one alternative embodiment is: the number of the perforated pipes 40 can be adjusted according to the number of the first holes 11 and the second holes 21, and the perforation aperture and the perforation rate of the perforated pipes 40 can be adjusted adaptively according to the overall size of the sound-deadening unit.

Referring to fig. 3, in the sound-deadening unit 100 disclosed in the embodiment of the present application, the structural size of the sound-deadening chamber satisfies the relationship: d is more than or equal to 0.8L, D is more than L, and D/D is more than or equal to 2.0, wherein D is the equivalent size of the first hole or the second hole, D is the equivalent size of the cross section of the main body of the silencing cavity, and L is the equivalent length of the main body of the silencing cavity.

Generally, the equivalent size is equivalent to several corresponding actual data sizes, and when the sound attenuating unit 100 has a regular shape, the equivalent size may be the actual data size. The conversion relationship between the equivalent size and the actual data size is common knowledge and can be obtained by referring to relevant textbooks, and the embodiment of the application is not described in detail.

The shape of the sound-deadening unit 100 according to the embodiment of the present application is a flat cylindrical shape, so that the sound-deadening modules described below are also described by taking a cylindrical shape as an example, and it is understood that the sound-deadening unit and the sound-deadening modules are not limited to the cylindrical shape described above, and may have other shapes, such as a rectangular shape or other polygonal structures.

The silencing module 200 disclosed in the embodiment of the present application at least includes more than one acoustic radial silencing units 100, the acoustic radial silencing units 100 are sequentially connected in series and assembled together, and the holes between the silencing units 100 correspond to each other. The acoustic radial silencing units 100 may be assembled in series from small to large according to a rule, or may be assembled irregularly. However, the connection is usually made in accordance with the convenience and practicability of installation, and the connection is preferably made in sequence according to a rule.

Referring specifically to fig. 5, fig. 5 shows a sound-deadening module 200 including only one first hole 11 and also including the hole pipe 40, and the sound-deadening module 200 is assembled by 4 sound-deadening units 100, it is understood that, if there are a plurality of sound-deadening units 100, it is allowable. In addition, when the muffler unit 100 is in a structural form including a plurality of perforated pipes 40, the muffler module 200 in the embodiment is also changed accordingly, and a separate drawing example is not given in this application.

The embodiment of the application also provides a silencing structure, wherein the silencing structure is formed by integrally embedding and installing the acoustic radial silencing unit 100 in a building wall; or formed by embedding the aforementioned sound attenuation module 200 partially or completely in the building wall. The silencing unit or the silencing module is arranged in the wall body, the flat characteristic of the silencing cavity is utilized, the building is ingeniously combined, and the wall body is used as a part of the silencing cavity, so that the space is fully utilized.

FIG. 6 shows a set of experimental data for a shaped sound attenuating unit 100, where D ₁Is a dimension in one direction on the cross section of the main body of the sound-deadening chamber, D ₂The dimension of the main body of the sound-deadening chamber in the other direction in the cross section, D ₁And D ₂The dimension in both directions can be equivalent to D, i.e. the equivalent dimension is D; in the same way, L ₁Is a main body of a silencing cavityMaximum dimension of length, L ₂Is the minimum dimension of the length of the main body of the sound-deadening chamber, L ₁And L ₂Is L.

When the cross section of the main body of the silencing cavity is D ₁Fixed at 600mm, D ₂Taking 200mm, 250mm, 300mm, L ₁Respectively 200mm,300mm,500mm and L ₂When 50mm is taken, 9 kinds of test data are combined, and the results of the frequency spectrum calculation of the sound deadening volume (transmission loss) are shown in the following graph in which the horizontal axis represents frequency Hz and the vertical axis represents sound deadening volume dB.

Change D ₂,L ₁After the proportional relationship (D value is temporarily fixed), the corresponding equivalent dimensions D and L also change, and for convenience of description, the embodiment is described with the corresponding equivalent dimensions.

When the proportion of dl and dd increases gradually and surpasss a critical point respectively, the vertical modal conversion of acoustics to the radial modal of acoustics of sound attenuation unit 100 has taken place the modal variation this moment, has produced radial modal in the low frequency range, very big improvement the noise elimination volume of low frequency range this moment, the noise elimination volume of comparison traditional noise attenuation unit, the utility model discloses the noise elimination volume of muffler can additionally increase 20 decibels.

FIG. 7 shows a set of experimental data for another profiled sound attenuating unit 100, wherein:

the values of the embodiment of the application are as follows: d ₁＝700mm、D ₂＝200mm、L ₁＝200mm，L ₂＝20mm；

The value of the existing traditional silencing unit is as follows: d ₁＝700mm、D ₂＝200mm、L ₁＝1000mm，L ₂＝20mm；

By varying only the length L ₁It can be seen that, when the acoustic mode has a lateral or radial variation, it is obvious that the sound attenuation amount of the embodiment of the present application in the low frequency range is far higher than the maximum sound attenuation amount of the conventional sound attenuation unit by about 30 db and has a better bandwidth.

Fig. 8 shows experimental data of an acoustic simulation of a sound-deadening module 200 according to an embodiment of the present invention, and it can be seen that the sound-deadening module 200 greatly increases the sound-deadening volume at low frequencies to more than 50dB, and the present embodiment has not only higher sound-deadening volume at low frequency range, but also better bandwidth, so that the bandwidth of the sound-deadening device can be greatly increased through the combination design of different sound-deadening units 100.

From the above, it can be seen that:

the embodiment of the application has abandoned the vertical modal amortization of acoustics in the traditional design of amortization unit, and has adopted the radial modal amortization of acoustics, has just also abandoned the design of traditional last L > D, L > D, and adopts the radial modal of acoustics, and amortization unit body appearance is the shape of flat form, just also only under D > > L condition, and the radial modal of acoustics embodies comparatively obviously. The main silencing frequency range can be controlled by utilizing the proportion of D/D, and compared with the traditional design L > D, the invention greatly improves the silencing volume in the low-frequency range.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.

Claims

1. Acoustic radial silencing unit, characterized in that it comprises:

a first orifice plate having at least one first orifice therein;

2. The acoustic radial muffler unit of claim 1, wherein the cross-section of the chamber structure is circular, and the first and second apertures are also circular.

3. An acoustic radial muffler unit as claimed in claim 1, wherein at least one of said first apertures is arranged concentrically with at least one of said second apertures.

4. An acoustic radial muffler unit as claimed in any one of claims 1 to 3, further comprising a perforated pipe connected between the first and second holes and having a plurality of perforations communicating the perforated pipe with the muffler chamber, wherein the perforations have a diameter of 3mm to 6mm and a perforation rate of 40% to 50%.

5. The sound-deadening module is characterized by comprising at least one acoustic radial sound-deadening unit as set forth in any one of claims 1 to 4, wherein the acoustic radial sound-deadening units are sequentially connected in series and assembled together, and the holes between the sound-deadening units correspond to each other.

6. The muffler module of claim 5, wherein the acoustic radial muffler units are assembled together in a regular series from small to large.

7. The sound-deadening structure characterized in that it is formed by embedding and installing the acoustic radial sound-deadening unit of any one of claims 1 to 4 integrally in a building wall; or formed by partial or complete embedded installation of the sound attenuating module of any one of claims 5 to 6 in a building wall.