CN112863471A - Sound insulation device - Google Patents
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- CN112863471A CN112863471A CN202110046040.XA CN202110046040A CN112863471A CN 112863471 A CN112863471 A CN 112863471A CN 202110046040 A CN202110046040 A CN 202110046040A CN 112863471 A CN112863471 A CN 112863471A
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- 238000009413 insulation Methods 0.000 title claims abstract description 71
- 239000012528 membrane Substances 0.000 claims abstract description 46
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 4
- 239000004626 polylactic acid Substances 0.000 claims description 4
- 229920002379 silicone rubber Polymers 0.000 claims description 4
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 description 34
- 230000000694 effects Effects 0.000 description 12
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- 229910000831 Steel Inorganic materials 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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Abstract
The embodiment provides a sound insulation device which comprises a first grating, a second grating and an elastic film, wherein a plurality of first through holes are formed in the first grating; the second grid is provided with a plurality of second through holes which are in one-to-one correspondence with the first through holes; the elastic film is clamped between the first grating and the second grating and is tensioned in advance, the first grating and the second grating divide the elastic film into a plurality of elastic film units with discontinuous tension, and the elastic film units correspond to the first through holes one to one; each first through hole, each second through hole and the elastic membrane unit arranged between the first through hole and the second through hole form a sound insulation unit. The sound insulation device of the embodiment can effectively absorb low-frequency noise.
Description
Technical Field
The application relates to the technical field of noise control, in particular to a sound insulation device.
Background
In recent years, with the scientific and technological progress and the rapid development of national economy, the traditional environmental pollution problems (such as air pollution, water pollution and the like) are greatly improved. However, with the rapid development of some high and new technology (such as high-speed rail, aerospace, automobile and the like) industries, low-frequency noise pollution is becoming serious day by day, and the low-frequency noise pollution gradually becomes an important factor for restricting the development of national economy.
In the related technical scheme, the sound insulation materials are generally made of materials with higher hardness, such as steel plates, and the sound insulation materials follow the law of quality control, so that the sound insulation effect can be improved only by increasing the thickness of the materials on the premise of keeping the density unchanged; and these sound insulation materials are better to the sound insulation effect of high frequency channel, but to the noise sound insulation effect of low frequency channel very poor, sometimes can even because of the resonance of self, lead to producing the amplification to the noise, play a suitable opposite effect. Therefore, it is urgently needed to develop a sound insulation device specially aiming at low-frequency noise.
Disclosure of Invention
The embodiment of the application provides a sound insulation device which is mainly used for solving the problem that the sound insulation effect of the sound insulation device on low-frequency noise in the related technology is poor.
An embodiment of the present application provides a sound insulation device, including:
the first grating is provided with a plurality of first through holes;
the second grating is opposite to the first grating, and a plurality of second through holes which are in one-to-one correspondence with the first through holes are formed in the second grating;
the elastic film is clamped between the first grid and the second grid, the elastic film is tensioned in advance, the elastic film is divided into a plurality of elastic film units with discontinuous tension by the first grid and the second grid, and the elastic film units correspond to the first through holes and the second through holes one to one;
each of the first through hole, the second through hole and the elastic membrane unit arranged between the first through hole and the second through hole form a sound insulation unit.
A sound-insulating device as described above, optionally with one or more of said elastic membranes disposed between said first and second grids.
The sound insulation device as described above, optionally, the thickness of the elastic membrane unit in each sound insulation unit is the same or different.
The sound insulation device as described above, optionally, the elastic membrane is a silicone rubber membrane, and the thickness of the elastic membrane is 0.05 to 0.4 mm.
The sound insulation device as described above, optionally, the elastic membrane unit is bonded with a mass block, the mass block is bonded on two sides of the elastic membrane unit, and the mass block is disposed at a geometric center position of the elastic membrane unit.
Optionally, the mass block is cylindrical, the mass block is a sintered neodymium iron boron mass block, and the density of the mass block is 7.5kg/m3。
Optionally, a plurality of first fixing holes are formed around the first through hole, a plurality of second fixing holes corresponding to the first fixing holes one to one are formed around the second through hole, a third through hole corresponding to the first fixing hole one to one is formed in the elastic film, and a fastener penetrates through the first fixing hole, the third through hole and the second fixing hole in sequence to fixedly connect the first grating, the second grating and the elastic film.
Optionally, the second fixing hole is internally provided with threads, and the fastening piece is a screw.
Optionally, the first and second grids are polylactic acid gridsThe density is 1200-1300 kg/m3The flexural modulus is 100-150MPa, the elastic modulus is 3-4GPa, and the Rockwell hardness is 88.
A sound-proof device as described above, optionally, the thickness of the first grating and the thickness of the second grating are both less than or equal to 5 mm; the wall thickness between two adjacent first through holes is smaller than or equal to 1.2 mm; the wall thickness between two adjacent second through holes is less than or equal to 1.2 mm; the area of the first through hole and the area of the second through hole are both smaller than or equal to 400mm2。
The embodiment of the application provides a sound insulation device which comprises a first grating, a second grating and an elastic film, wherein a plurality of first through holes are formed in the first grating; the second grating is opposite to the first grating, and a plurality of second through holes which are in one-to-one correspondence with the first through holes are formed in the second grating; the elastic film is clamped between the first grating and the second grating and is tensioned in advance, the elastic film is divided into a plurality of elastic film units with discontinuous tension by the first grating and the second grating, and the elastic film units correspond to the first through holes and the second through holes one to one; each first through hole, each second through hole and the elastic membrane unit arranged between the first through hole and the second through hole form a sound insulation unit. The sound insulation device comprises a plurality of sound insulation units, and the tension of the elastic film units in two adjacent sound insulation units is discontinuous, so that each sound insulation unit can independently play a sound insulation role, and the sound insulation device can effectively absorb low-frequency noise.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic view of a sound-proof device according to an embodiment of the present application;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
fig. 3 shows an exploded view of a sound-proof device according to an embodiment of the present application;
FIG. 4 is an enlarged view of a portion B of FIG. 3;
FIG. 5 is an enlarged view of a portion C of FIG. 3;
FIG. 6 is a simplified structural diagram of a first grid according to an embodiment of the present application;
FIG. 7 is an enlarged view of a portion D of FIG. 6;
fig. 8 is a view showing an assembly process of a sound-proof device according to an embodiment of the present application;
FIG. 9 is an enlarged view of a portion E of FIG. 8;
fig. 10 shows the amount of attenuation of noise of a sound-proof device according to an embodiment of the present application;
fig. 11 shows an insertion loss of a sound-proof device according to an embodiment of the present application;
fig. 12 shows the sound insulation amount and the equivalent areal density calculated by simulation of a sound-proof device according to an embodiment of the present application.
Reference numerals:
1-a sound-insulating device;
10-a sound insulation unit;
100-a first grid; 110 — a first via; 120-a first fixation hole;
200-a second grid; 210-a second via; 220-a second fixing hole;
300-an elastic film; 310-a third via;
400-mass block;
500-a fastener;
600-installing the tool.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 1 is a schematic view of a sound-proof device according to an embodiment of the present application; FIG. 2 is an enlarged view of a portion A of FIG. 1; fig. 3 shows an exploded view of a sound-proof device according to an embodiment of the present application; FIG. 4 is an enlarged view of a portion B of FIG. 3; FIG. 5 is an enlarged view of a portion C of FIG. 3; FIG. 6 is a simplified structural diagram of a first grid according to an embodiment of the present application; FIG. 7 is an enlarged view of a portion D of FIG. 6; fig. 8 is a view showing an assembly process of a sound-proof device according to an embodiment of the present application; FIG. 9 is an enlarged view of a portion E of FIG. 8; please refer to fig. 1-9.
The embodiment provides a sound insulation device 1, which comprises a first grid 100, a second grid 200 and an elastic film 300, wherein the first grid 100 is provided with a plurality of first through holes 110; the second grid 200 is arranged opposite to the first grid 100, and a plurality of second through holes 210 corresponding to the first through holes 110 one to one are arranged on the second grid 200; the elastic film 300 is clamped between the first grid 100 and the second grid 200, the elastic film 300 is pre-tensioned, the first grid 100 and the second grid 200 divide the elastic film 300 into a plurality of elastic film units with discontinuous tension, and the elastic film units correspond to the first through holes 110 and the second through holes 210 one by one; each of the first through-hole 110, the second through-hole 210, and the elastic membrane unit disposed between the first through-hole 110 and the second through-hole 210 constitutes one sound-proof unit 10.
Specifically, the shape of the first grid 100 is similar to the shape of the second grid 200 in this embodiment; preferably, as shown in fig. 3, the two are identical in shape to form a front-to-back overlapping structure. The shapes of the first through holes 110 and the second through holes 210 are also identical and correspond to each other one by one, and the specific shape of the through holes can be selected according to actual needs, for example, the through holes can be circular, square, triangular, and the like.
In this embodiment, the first grid 100 and the second grid 200 are preferably both polylactic acid grids having a density of 1200 to 1300kg/m3The flexural modulus is 100-150MPa, the elastic modulus is 3-4GPa, and the Rockwell hardness is 88. Preferably, on the basis of the above embodiment, the first through hole 11 of the present embodiment0 and second through-hole 210 all adopt the mode processing of 3D printing to form to guaranteed the machining precision, reduced the manufacturing degree of difficulty, when making the wall thickness between two adjacent through-holes on same grid be less than certain numerical value, whole grid still has great rigidity.
The elastic membrane 300 is sandwiched between the first grid 100 and the second grid 200, and preferably has the same area as the first grid 100 and the second grid 200, so that the absorption frequency of the sound insulation device 1 can be adjusted by only adjusting the tension degree and thickness of the elastic membrane 300 and the specification parameters of the mass sheet 400, and a device capable of adapting to various noises with different frequencies can be manufactured conveniently.
Alternatively, the elastic membrane 300 may be sandwiched between the first and second grids 100 and 200 by a pressing force therebetween, and divided into a plurality of elastic membrane units discontinuous with each other by the grid walls around the first through holes 110 and the corresponding grid walls around the second through holes 210. The pre-tension of the elastic membrane 300 can be calculated according to the noise frequency range, the target sound insulation amount, and the like, and the pre-tension of the elastic membrane 300 can be characterized by the strain.
As shown in fig. 1 and 2, each of the first through hole 110, the second through hole 210, and the elastic membrane unit disposed between the first through hole 110 and the second through hole 210 form a basic sound insulation unit 10, tension of the elastic membrane unit in two adjacent sound insulation units 10 is discontinuous, and a mass 400 is bonded to the elastic membrane unit in the sound insulation unit 10. In order to ensure that the sound insulation device can better absorb low-frequency noise, each sound insulation unit 10 is small enough, and the wall thickness between two adjacent sound insulation units 10 is narrow enough; preferably, the thickness of the first grid 100 and the thickness of the second grid 200 are both less than or equal to 5mm in the present embodiment; the area of the first through hole 110 and the area of the second through hole 210 in the sound insulation unit 10 are both smaller than or equal to 400mm2The wall thickness between two adjacent first through holes 110 is less than or equal to 1.2mm, and the wall thickness between two adjacent second through holes 210 is less than or equal to 1.2 mm. Sound-proof device 1 includes a plurality of sound-proof units 10, thereby enabling sound-proof device 1 to effectively absorb low-frequency noise.
The elastic membrane 300 in this embodiment is preferably a silicon rubber membrane, and the thickness of the elastic membrane 300 is preferably 0.05 to 0.4 mm.
In an optional embodiment, in this embodiment, the mass blocks 400 are disposed on both sides of the elastic membrane unit in the sound insulation unit 10, the mass blocks 400 are disposed at the geometric center of the elastic membrane unit, and during installation, the installation tool 600 as shown in fig. 8 and 9 may be used to perform auxiliary installation, the shape of the installation tool 600 is similar to the first through hole 110, the installation tool 600 is embedded in the first through hole and abuts against the elastic membrane unit, the center of the installation tool 600 is provided with an installation hole, and the mass blocks 400 are disposed in the installation hole, that is, the mass blocks 400 are disposed at the geometric center of the elastic membrane unit. Preferably, the mass 400 is cylindrical, the mass 400 is a sintered NdFeB mass 400, and the density of the mass 400 is 7.5kg/m3. The two masses 400 have strong magnetism in the axial direction and no magnetism in the radial direction, and thus are attracted to each other to be fixed at both sides of the elastic membrane unit. Parameters such as mass, diameter, and thickness of the mass sheet 400 in this embodiment can be determined according to the target sound insulation frequency range and sound insulation amount.
The sound insulation device 1 of the embodiment comprises a plurality of sound insulation units 10, and the tension of the elastic film unit in two adjacent sound insulation units 10 is discontinuous, so that each sound insulation unit 10 can independently play a sound insulation role, and the sound insulation device 1 can effectively absorb low-frequency noise.
Further, one or more layers of elastic films 300 may be disposed between the first grid 100 and the second grid 200 in this embodiment, and the specific number of layers may be determined according to actual needs. Moreover, the thicknesses of the elastic film units in each sound insulation unit 10 are the same or different, and when the thicknesses of the elastic film units in the sound insulation units 10 are different, each sound insulation unit 10 can absorb low-frequency noise with different frequencies, so that the overall sound insulation performance of the sound insulation device 1 is improved.
In an optional embodiment, as shown in fig. 3 to 5, a plurality of first fixing holes 120 are disposed around the first through hole 110 of this embodiment, a plurality of second fixing holes 220 corresponding to the first fixing holes 120 one by one are disposed around the second through hole 210, a third through hole 310 corresponding to the first fixing hole 120 one by one is disposed on the elastic film 300, and the fastening member 500 sequentially passes through the first fixing hole 120, the third through hole 310 and the second fixing hole 220 to fixedly connect the first grid 100, the second grid 200 and the elastic film 300. Fastener 500 may apply sufficient axial pressure to break the continuity of the elastic membrane cell tension within each sound-proof cell 10.
Preferably, in this embodiment, the first fixing hole 120 is a through hole, a thread is disposed in the corresponding second fixing hole 220, the fastening member 500 is a screw, the fastening member 500 is threaded to the second fixing hole 220 after passing through the first fixing hole 120, and the fastening member 500 is connected to a spring washer and a nut after passing through the second fixing hole 220, so as to fasten with the second grid 200.
The sound-insulating device 1 of the present embodiment can be manufactured by:
a noise frequency range in the environment is obtained. The noise frequency range in the environment can be directly measured with the associated acoustic instruments.
And setting a target noise frequency, and obtaining the noise attenuation according to the difference value of the acquired environmental noise frequency and the target noise frequency.
A simulation calculation model of the sound insulating device 1 was created in ANSYS or COMSOL software, in which the first grating 100 and the second grating 200 each employ the polylactic acid grating in the above-described embodiment, and the grating density, young's modulus, mechanical parameters, and the like were determined. The target noise frequency may be reached by adjusting a partially undetermined parameter. The tension of the elastic film 300 and the density of the mass sheet 400 should be selected to be appropriate values, i.e., the median value of the actual selectable range, and the maximum value cannot be selected.
Reversely pushing according to the result of the simulation calculation to determine the prestress of the elastic membrane 300 (the silicon rubber membrane in the above embodiment is selected) and the area density of the mass sheet 400; the surface density of the mass sheet 400 can be determined by adjusting the thickness of the mass sheet 400, and the rule is that the larger the surface density of the mass sheet 400 is, the smaller the thickness and the diameter are, and the better the sound insulation effect is.
The tensile strength of the elastic film 300 is measured on a tensile machine, and the thickness of the elastic film 300 and the required number of layers of the elastic film 300 are calculated and determined according to the prestress of the elastic film 300 obtained in the above steps and the measured tensile strength of the elastic film 300. The anti-aging and anti-tearing capabilities of the sound insulation device can be improved by increasing the number of the layers of the elastic film 300, and meanwhile, the sound insulation effect is improved through a larger damping effect.
Selecting a proper screw according to the sizes of the first fixing hole 120 and the second fixing hole 220; the screw should have sufficient pre-stress strength to ensure the independence of the sound insulation unit.
The specification of the mass sheet 400 is determined according to the areal density of the mass sheet 400 obtained in the above steps, and the specification of the mass sheet 400 includes the mass, diameter and height of the mass sheet 400, and generally, standard parts are selected.
The areas of the first and second grids 100 and 200 and the area of the elastic membrane 300 are calculated and determined. The areas of the first grating 100 and the second grating 200 are generally determined according to the environment where sound insulation and noise reduction are needed, but in order to ensure the sound insulation effect, the areas of the first grating 100 and the second grating 200 have the minimum value, and the minimum value is determined by the noise frequency range and the field environment.
The first and second grids 100 and 200 are processed using a 3D printing technique according to the areas of the first and second grids 100 and 200 obtained in the above steps.
The pre-strain of the elastic membrane 300 is calculated from the pre-stress of the elastic membrane 300 and the elastic membrane 300 is tensioned. Wherein the pre-strain of the elastic film 300 is derived according to the following formula:
wherein σ represents stress in Pa; y represents Young's modulus in Pa; ε represents the prestrain.
The first grill 100, the second grill 200, the elastic thin film 300, and the mass plate 400 were assembled together, the noise attenuation (the sound pressure level difference between certain points inside and outside the sound insulating material) and the insertion loss (the sound pressure level difference between certain points on the sound wave transmitting side before and after the sound insulating material was installed) of the sound insulating device were measured, and the prestrain of the elastic thin film 300 and the specification parameters of the mass plate 400 were adjusted according to the test results.
Here, the mass plate 400 may be mounted as shown in fig. 8 and 9. Namely, corresponding installation tools are designed according to the specific shapes of the first through hole and the second through hole, and the mass plate 400 is positioned at the geometric centers of the first through hole and the second through hole. The shape of the first through-hole and the second through-hole of this embodiment is square behind the chamfer, therefore the installation frock also is square behind the chamfer, and installation frock diameter slightly is less than the diameter of first through-hole and second through-hole, convenient quick installation and dismantlement. During assembly, the mounting tool is firstly placed, and then the quality piece 400 is placed.
In this embodiment, the noise attenuation amount and the insertion loss are measured only by measuring the sound pressure level of the relevant point with a sound level meter and calculating the difference between them. Different from the sound insulation quantity, from the test effect, the measurement results of the noise attenuation quantity and the insertion loss are the field practical factors such as the field environment, the lateral sound transmission, the system sound leakage and the like, and the noise intensity of the human ear in the practical environment can be better represented.
Fig. 10 shows the amount of attenuation of noise in a sound-proof device according to an example of the present application. The results shown in the figure were obtained by using a hexahedral test chamber, one side of which was opened and the sound insulator of this example was attached, and then measuring the noise attenuation amounts at P2 and P3, respectively. Wherein the P2 is 380mm away from the sound source, and the P3 is 1000mm away from the sound source. The noise frequency range is 60 Hz-500 Hz, and the step length is 5 Hz.
Fig. 11 shows an insertion loss of a sound-proof device according to an embodiment of the present application. The result shown in the figure is that the noise insertion loss at the geometric center of the sound-insulating device is measured at a distance of 5mm from the sound-insulating device after the sound-insulating device of the present embodiment is attached to a hexahedral test box with one side open. The noise frequency range is 60 Hz-500 Hz, and the step length is 5 Hz.
Fig. 12 shows the sound insulation amount and the equivalent areal density calculated by simulation of a sound-proof device according to an embodiment of the present application. In simulation software, the sound insulation device of the present embodiment is placed in a rectangular parallelepiped, the front and rear surfaces serve as a sound wave incident surface and a sound wave transmitting surface, and the remaining four surfaces serve as a hard sound field for completely reflecting sound, and the sound insulation amount STL (the sound energy ratio of noise passing through the front and rear surfaces of the material) is obtained by calculation, and can be calculated by the following formula.
Wherein
In this embodiment, the defined incident sound pressure PinIs 1 Pa; poutThe transmission sound pressure can be obtained through calculation; rho0C0Is an acoustic impedance; s1、S2The areas of the acoustic wave incident surface and the acoustic wave transmission surface respectively; the scanning frequency range is 60 Hz-500 Hz; the step size is 1 Hz.
ρ represents the equivalent areal density of this example in kg/m2(ii) a Referring to fig. 12, the STL valley is the same as the frequency when ρ is 0, and the STL peak is the same as the frequency when the absolute value of ρ is maximum.
When rho is 0, the sound insulation device generates resonance, and under the action of incident sound pressure, the acceleration of the device in the incident sound pressure direction is large, and at the moment, the sound insulation device vibrates most violently, so the sound insulation effect is the worst.
When the absolute value of rho is maximum, the result shows that the acceleration amplitude of the sound insulation device in the incident sound pressure direction is at the minimum value under the action of incident sound pressure, and the vibration is least severe at the moment, so that the sound insulation effect is best.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application.
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 application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A sound-insulating device, comprising:
the first grating is provided with a plurality of first through holes;
the second grating is opposite to the first grating, and a plurality of second through holes which are in one-to-one correspondence with the first through holes are formed in the second grating;
the elastic film is clamped between the first grid and the second grid, the elastic film is tensioned in advance, the elastic film is divided into a plurality of elastic film units with discontinuous tension by the first grid and the second grid, and the elastic film units correspond to the first through holes and the second through holes one to one;
each of the first through hole, the second through hole and the elastic membrane unit arranged between the first through hole and the second through hole form a sound insulation unit.
2. A sound-insulating device according to claim 1, characterized in that one or more of said elastic membranes are arranged between said first and second grids.
3. The sound-insulating device according to claim 1, wherein the thickness of the elastic membrane unit in each sound-insulating unit is the same or different.
4. A sound-insulating device according to claim 1, characterized in that the elastic membrane is a silicone rubber membrane, the thickness of which is 0.05-0.4 mm.
5. The sound-insulating device according to claim 1, wherein a mass is bonded to the elastic membrane unit, the mass being bonded to both sides of the elastic membrane unit, the mass being disposed at a geometric center of the elastic membrane unit.
6. The sound insulation device of claim 5 wherein the mass is cylindrical and is a sintered NdFeB mass having a density of 7.5kg/m3。
7. The sound insulation device according to any one of claims 1 to 6, wherein a plurality of first fixing holes are formed around the first through hole, a plurality of second fixing holes corresponding to the first fixing holes one by one are formed around the second through hole, a third through hole corresponding to the first fixing holes one by one is formed in the elastic membrane, and a fastening member passes through the first fixing holes, the third through holes and the second fixing holes in sequence to fixedly connect the first grating, the second grating and the elastic membrane.
8. The sound-insulating device of claim 7, wherein the second fixing hole is threaded and the fastener is a screw.
9. The sound-insulating device according to claim 1, characterized in that the first and second grids are polylactic acid grids having a density of 1200-1300 kg/m3The flexural modulus is 100-150MPa, the elastic modulus is 3-4GPa, and the Rockwell hardness is 88.
10. The sound-insulating device according to claim 1, characterized in that the thickness of the first grid and the thickness of the second grid are each less than or equal to 5 mm; the wall thickness between two adjacent first through holes is smaller than or equal to 1.2 mm; the wall thickness between two adjacent second through holes is less than or equal to 1.2 mm; the area of the first through hole and the area of the second through hole are both smaller than or equal to 400mm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110046040.XA CN112863471A (en) | 2021-01-14 | 2021-01-14 | Sound insulation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110046040.XA CN112863471A (en) | 2021-01-14 | 2021-01-14 | Sound insulation device |
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| CN112863471A true CN112863471A (en) | 2021-05-28 |
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