CN117116239A - Noise reduction structure and noise reduction assembly - Google Patents

Abstract

The application provides a noise reduction structure and a noise reduction assembly, relates to the technical field of noise reduction, and aims to solve the problem that the traditional structure cannot effectively achieve ventilation and noise reduction. The noise reduction structure provided by the application comprises a cavity, wherein a cavity is formed in the cavity, and a first outer surface and a second outer surface which are arranged in a mutually deviating manner are arranged on the outer surface of the cavity; the cavity is also provided with a channel for air circulation, the channel is provided with a first port and a second port, the first port is positioned on the first outer surface, and the second port is positioned on the second outer surface; the side wall of the channel is provided with a through hole, and the channel is communicated with the cavity through the through hole. The structure formed by the cavity and the through hole can be understood as a Helmholtz resonator, and sound waves passing through the channel can be effectively weakened, so that the effect of noise reduction is achieved.

Description

Noise reduction structure and noise reduction assembly

Technical Field

The application relates to the technical field of noise reduction, in particular to a noise reduction structure and a noise reduction assembly.

Background

Noise pollution has obvious influence on living environment and physical health of residents, and researches show that when people live in the environment polluted by noise for a long time, hearing of people can be reduced, people can be easy to be irritated, and the like. With the continued development of the urban process, more and more people begin to work and live in the urban environment. Taking a residential building as an example, noise faced by the residential building mainly includes natural noise and artificial noise. Wherein the natural noise may include thunder, animal call, etc. The artificial noise may include engine noise of a vehicle, road noise generated when the vehicle is running, voice of a person speaking, noise of an air conditioner external unit, voice generated by sound, and the like, and the source of the noise is wide and the frequency band is wide.

At present, closing doors and windows is the most common method for people to reduce noise, but after the doors and windows are closed, air between the indoor space and the outside space cannot circulate, so that the indoor air quality can be reduced, and if the doors and windows are ventilated, the noise cannot be blocked. Therefore, the opening and closing of the window are the problems facing people, namely that the traditional doors and windows do not have the functions of noise reduction and ventilation.

Disclosure of Invention

The application provides a noise reduction structure and a noise reduction assembly which can have noise reduction and ventilation functions.

In one aspect, the present application provides a noise reduction structure that may include a cavity having a cavity therein and having a first outer surface and a second outer surface disposed away from each other on an outer surface of the cavity. Wherein the first outer surface and the second outer surface are not strictly opposed outer surfaces. The cavity also has a passageway for air flow therethrough, the passageway having a first port located on the first outer surface and a second port located on the second outer surface. I.e. by providing channels, air can circulate from the side facing the first outer surface to the side facing the second outer surface. The side wall of the channel is provided with a through hole, and the channel is communicated with the cavity through the through hole. The structure formed by the cavity and the through hole can be understood as a Helmholtz resonator, and sound waves passing through the channel can be effectively weakened, so that the effect of noise reduction is achieved.

In general terms, air may be channeled through the noise reducing structure, and thus the noise reducing structure has a ventilation function. In addition, when sound waves pass through the channel, the structure formed by the cavity and the through hole can effectively weaken the sound waves, so that the noise reduction structure has the function of noise reduction.

In one example, the noise reduction structure may also include a sound attenuation conduit. The silencing pipeline may include a first end and a second end, wherein the first end is an open end, the second end is a sealed end, and the first end may be in communication with the passage. Wherein the first end may be in direct communication with the channel, e.g., the first end may be disposed at a side wall of the channel. Alternatively, the first end may be in indirect communication with the channel, e.g., the first end may be located within the cavity, through which the first end may communicate with the channel.

The sound absorption principle of the silencing pipeline is that when sound enters the silencing pipeline from the first end and propagates in the silencing pipeline, a medium (such as air) in the silencing pipeline and the inner wall of the silencing pipeline rub against each other to generate a thermal viscous effect, so that the energy of sound waves is converted into heat energy to be consumed.

Through setting up amortization pipeline in the structure of making an uproar falls, can utilize the thermal viscous effect to consume the sound to be favorable to promoting the noise reduction function of the structure of making an uproar falls.

When specifically arranged, the natural frequency of the silencing pipeline and the natural frequency of the cavity can be the same. When the silencing pipeline generates resonance, the cavity can be excited to generate resonance, so that the noise reduction effect of the noise reduction structure is effectively improved.

The arrangement mode of the silencing pipeline can be various. For example, the muffler line may be formed by providing a partition within the cavity. Alternatively, the pipe may be provided in the cavity, i.e. the inner space of the pipe forms a sound deadening line.

In addition, when specifically setting up, amortization pipeline can set up along the outline of cavity, consequently, can make amortization pipeline have great length dimension, be favorable to promoting the amortization effect of amortization pipeline. In addition, the silencing pipeline does not occupy excessive space, so that the volume of the cavity is not obviously reduced, and the isolation effect of the noise reduction structure on sound waves in lower frequency bands is guaranteed.

Or, the silencing pipeline can be arranged in a folding (or S-shaped) mode, so that the occupied volume of the silencing pipeline is reduced, the volume of the cavity is not obviously reduced, and the isolation effect of the noise reduction structure on sound waves in lower frequency bands is guaranteed. In addition, the silencing pipeline can be made to have a larger length dimension, and the silencing effect of the silencing pipeline is improved.

The silencing pipeline can be arranged on one side, far away from the through hole, of the cavity so as to ensure that sound waves can smoothly enter the cavity from the through hole.

Of course, one silencing pipeline may be provided in the noise reduction structure, and two or more silencing pipelines may be provided.

Wherein each of the muffler pipes may be independent of each other. Alternatively, at least two of the silencing lines may communicate with each other so that sound waves in the two silencing lines are consumed by each other.

The number of cavities may be one, two or more.

For example, the noise reduction structure may include a partition disposed within the cavity, which may divide the cavity into at least two sub-cavities, and each sub-cavity may communicate with the channel through a correspondingly disposed through-hole.

The volume of each subcavity may be the same or approximately the same for a particular application. I.e. the partition plate may equally divide the space within the cavity. Alternatively, at least two of the sub-cavities may have different volumes.

When the volumes of the cavities (or sub-cavities) are different, the sound waves in different frequency bands can be well isolated. Therefore, when the cavity is divided into a plurality of sub-cavities, the volume of each sub-cavity can be different, so that good isolation effect is achieved on sound waves in different frequency bands. Of course, in practical application, the sound waves in different frequency bands can be well isolated by adjusting the aperture of the through hole.

In one example, the noise reduction structure may further include a filter screen for covering the channel, thereby performing filtering or blocking functions. For example, the filter screen can filter impurities such as dust, pollen, batting and the like to play a certain role in purification. Or, the filter screen can also effectively block mosquitoes.

Alternatively, in some examples, the noise reduction structure may also include a volume-expanding material. The volume-expanding material may include gel, porous ceramic, foam, or the like. The volume-expanding material can be filled in the cavity (or the sub-cavity) to change the noise reduction characteristics of the noise reduction structure, so that the noise reduction performance of the noise reduction structure can be optimized.

When the noise reduction structure is applied specifically, the shape and the specific size of the noise reduction structure can be flexibly set according to different requirements.

For example, the cavity may be a square sheet, and the side dimension of the cavity may be greater than or equal to 50mm and less than or equal to 65mm. The width dimension of the cavity is greater than or equal to 2mm and less than or equal to 15mm. So that the noise reduction structure can effectively block the sound in the range from 800Hz to 5000 Hz.

In addition, the area of the first port on the first outer surface is 10% to 50%. The area ratio of the second port on the second outer surface is 10% to 50%, or the diameter of the channel is greater than or equal to 2mm. So that the noise reduction structure can effectively give consideration to ventilation and noise reduction effects.

On the other hand, the application also provides a noise reduction assembly, which comprises a connecting structure and any noise reduction structure, wherein two adjacent noise reduction structures can be connected through the connecting structure. It can be understood that in practical application, the plurality of noise reduction structures can form a whole through the connection structure, so that convenience in use is improved, and the noise reduction structure is widely applied to different application scenes.

When specifically arranged, the cavity may have a connecting portion, the connecting portion being located between the first outer surface and the second outer surface, the connecting structure being connected with the connecting portion.

Of course, the connection portion may be located on the first outer surface or the second outer surface. I.e. the connection structure may be connected to the first outer surface or to the second outer surface.

In particular applications, the connection structure may be a rigid connection, a flexible connection, a collapsible connection, or the like. I.e. the relative position between two adjacent noise reducing structures is relatively stable, or the relative position between two adjacent noise reducing structures can be flexibly adjusted.

Alternatively, the connecting member may be a filter screen, and the filter screen may be attached to the first outer surface or the second outer surface. I.e. the connection structure 31 may have both connection and filtering functions.

In one example, the noise reduction assembly may further include a frame, and the plurality of noise reduction structures may be secured in a profile defined by the frame.

The noise reduction component can be a window screen, a partition board, a wallboard, a screen or a door curtain. That is, the noise reduction assembly can be applied to a plurality of different scenes and has wide applicability.

Drawings

Fig. 1 is a schematic diagram of an application scenario of a noise reduction structure according to an embodiment of the present application;

FIG. 2 is a perspective view of a noise reduction structure according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view along the plane A in FIG. 2;

fig. 4 is a schematic cross-sectional structure of a helmholtz resonator according to an embodiment of the present application;

fig. 5 is a simulation data diagram of a noise reduction effect of a noise reduction structure according to an embodiment of the present application;

FIG. 6 is a perspective view of another noise reduction structure provided by an embodiment of the present application;

FIG. 7 is a schematic view of the cross-sectional structure along the B-plane in FIG. 6;

FIG. 8 is a perspective view of another noise reduction structure provided by an embodiment of the present application;

FIG. 9 is a perspective view of another noise reduction structure provided by an embodiment of the present application;

FIG. 10 is a diagram of simulated data for comparing the noise reduction effects of two noise reduction structures according to an embodiment of the present application;

FIG. 11 is a schematic cross-sectional view of a muffler pipe according to an embodiment of the present application;

FIG. 12 is a perspective view of a noise reduction structure according to an embodiment of the present application;

FIG. 13 is a schematic view of the cross-sectional structure along the plane C in FIG. 12;

FIG. 14 is a perspective view of a noise reduction structure according to an embodiment of the present application;

FIG. 15 is a schematic view of the cross-sectional structure along the D-plane in FIG. 14;

FIG. 16 is a schematic cross-sectional view of another noise reduction structure according to an embodiment of the present application;

FIG. 17 is a simulated data diagram of a noise reduction effect of a noise reduction structure according to an embodiment of the present application;

FIG. 18 is a simulated data diagram of the noise reduction effect of another noise reduction structure provided by an embodiment of the present application;

FIG. 19 is a simulated data diagram of a noise reduction effect of another noise reduction structure according to an embodiment of the present application;

FIG. 20 is a perspective view of another noise reduction structure provided in accordance with an embodiment of the present application;

fig. 21 is a schematic perspective view of a noise reduction assembly according to an embodiment of the present application;

FIG. 22 is a schematic perspective view of another noise reduction assembly according to an embodiment of the present application;

FIG. 23 is a schematic plan view of another noise reduction assembly according to an embodiment of the present application;

FIG. 24 is a schematic view of another noise reduction assembly according to an embodiment of the present application in a tiled state;

FIG. 25 is a schematic view of another noise reduction assembly according to an embodiment of the present application in a folded state;

fig. 26 is a schematic perspective view of a window screening according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.

While the description of the application will be presented in connection with certain embodiments, it is not intended to limit the features of this application to only this embodiment. Rather, the purpose of the description in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the application. The following description contains many specific details for the purpose of providing a thorough understanding of the present application. The application may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

In embodiments of the present application, the terms "first," "second," "third," "fourth" 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 defining "a first", "a second", "a third" and a fourth "may explicitly or implicitly include one or more such feature.

In the embodiment of the present application, "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In describing embodiments of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and for example, the terms "connected" may be removably connected or non-removably connected; may be directly connected or indirectly connected through an intermediate medium. References to directional terms in the embodiments of the present application, such as "upper", "lower", "left", "right", "inner", "outer", etc., are merely with reference to the directions of the drawings, and thus, the directional terms are used in order to better and more clearly describe and understand the embodiments of the present application, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application. "plurality" means at least two. In order to facilitate understanding of the noise reduction structure provided by the embodiment of the present application, an application scenario thereof is first described below.

In order to facilitate understanding of the noise reduction structure provided by the embodiment of the present application, an application scenario thereof is first described below.

The noise reduction structure provided by the embodiment of the application can be applied to products such as screen windows, door curtains, baffles and the like, and can simultaneously give consideration to ventilation and noise reduction effects. It should be noted that ventilation refers to allowing air to pass through, and of course, the noise reduction structure may also allow fluid media such as water to pass through. In summary, the noise reduction structure provided by the embodiment of the application can also allow air or water and other fluids to pass through on the basis of having a noise reduction function.

As shown in fig. 1, in an application scenario provided in an embodiment of the present application, the noise reduction structure 10 may be applied to a screen window 20. Specifically, the screen window 20 may include a window frame 21, and a plurality of noise reduction structures 10 (10×8=80 are shown in the figure) may be sequentially connected, for example, a plurality of noise reduction structures 10 are arranged in an array, connected to each other, and installed in a contour surrounded by the window frame 21.

In addition, the noise reducing structure 10 may be installed inside the pipe or at one end of the pipe. The pipeline can be a ventilation pipeline, a water flow pipeline and the like.

In practical applications, the noise reduction structure 10 can be applied to a door curtain, a screen, a skylight baffle, a station baffle or a fresh air system, and can reduce noise and ventilate, which is not described herein.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings and specific embodiments.

The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include, for example, "one or more" such forms of expression, unless the context clearly indicates to the contrary. It should also be understood that in the following embodiments of the present application, "at least one" means one, two, or more than two.

Reference in the specification to "one embodiment" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more, but not all, embodiments" unless expressly specified otherwise. The terms "comprising," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

As shown in fig. 2 and 3, in one example provided by the present application, the noise reduction structure 10 may include a cavity 11, where the cavity 11 has a cavity 111 therein, and a first outer surface 112 and a second outer surface 113 disposed away from each other on an outer surface of the cavity 11. The chamber 11 also has a passage 114 for air to circulate, the passage 114 having a first port 114a and a second port 114b, the first port 114a being located on the first outer surface 112 and the second port 114b being located on the second outer surface 113. That is, by providing the channels 114, air may circulate from the side facing the first outer surface 112 to the side facing the second outer surface 113. The side wall 115 of the channel 114 has a through hole 116, and the channel 114 communicates with the cavity 111 through the through hole 116. The structure formed by the cavity 111 and the through hole 116 can be understood as a helmholtz resonator, and can effectively attenuate the sound wave passing through the channel 114, thereby playing a role in noise reduction.

In order to facilitate understanding of the technical scheme of the present application, first, the working principle of the helmholtz resonator will be described.

As shown in fig. 4, a schematic cross-sectional structure of a helmholtz resonator 01 is shown, and the helmholtz resonator 01 is a cavity 011. The cavity 011 has a neck 013 and a cavity 012. Wherein the area of the opening of the neck 013 is much smaller than the area of the cavity 012.

The air in the neck 013 can be considered as a column of air, and when there is a disturbance of the ambient air at the opening (e.g., there is a sound wave propagating in the air), the column of air in the neck 013 will move a little distance into the cavity 012, thereby compressing the air in the cavity 012 and increasing the pressure in the cavity 012. The increased pressure in turn pushes the column of air outwardly (upward in fig. 4) and when the column of air returns to the starting position, the column of air moves a bit further outwardly under the influence of inertia, which in turn expands the gas in cavity 012, reduces the pressure in cavity 012, and the resulting pressure differential moves the column of air into cavity 012. When air turbulence at the opening is always present, the air column of the neck 013 always oscillates back and forth.

Please refer to fig. 3 and fig. 4 in combination. In the present application, in providing the noise reduction structure 10, the structure composed of the cavity 111 and the through hole 116 can be understood as a helmholtz resonator 01. Wherein the through hole 116 can be regarded as a neck 013 and the cavity 111 can be regarded as a cavity 012. When sound waves exist in the air in the channel 114, the air column in the through hole 116 can vibrate reciprocally, so that acoustic resistance is formed in the channel 114, sound waves passing through the channel 114 are effectively weakened, and accordingly noise reduction effect is achieved. In practical applications, when the cross-sectional area of the through hole 116 is smaller than the area of the cavity 111, the structure formed by the through hole 116 and the cavity 111 can form the helmholtz resonator 01, and of course, the relative proportions of the through hole 116 and the cavity 111 are adopted in the application.

In addition, as shown in fig. 2 and fig. 3, in the noise reduction structure 10 provided by the application, since the side wall 115 exists between the cavity 111 and the channel 114, and the through hole 116 is formed in the side wall 115, the noise reduction structure 10 (or cavity) can effectively isolate the sound wave of the lower frequency band under the condition of having a smaller size.

To demonstrate this benefit, the noise reduction structure 10 shown in fig. 3 and 4 will be specifically described below as an example.

The cavity 11 may be a substantially square sheet, and the cavity 11 has a thin-walled structure. Wherein, the side length dimension of the cavity 11 is L, and the width dimension is H. The cavity 11 forms a cavity 111 inside. Where the walls of the cavity 11 are thin, the dimensions of the walls are negligible. Thus, the side dimension L of the cavity 11 is approximately equal to the side dimension of the cavity 111, and the width dimension H of the cavity 11 is approximately equal to the width dimension of the cavity 111. The channel 114 is generally circular in cross-section and the side wall 115 of the channel 114 has a square through hole 116. Where the diameter of the channel 114 is R and the side length of the through hole 116 is d.

As shown in fig. 5, a simulated data diagram of the noise reduction effect of the noise reduction structure shown in fig. 2 is provided.

In fig. 5, the abscissa indicates the frequency of sound in Hz. The ordinate indicates the sound insulation in dB. S1 to S4 represent simulation curves of noise reduction structures 10 of different sizes, respectively.

Specifically, the size of the noise reduction structure 10 corresponding to S1 is: l=50 mm, h=8 mm, r=20 mm, d=1.5 mm.

The size of the noise reduction structure 10 corresponding to S2 is: l=55 mm, h=8 mm, r=20 mm, d=1 mm.

The size of the noise reduction structure 10 corresponding to S3 is: l=60 mm, h=8 mm, r=20 mm, d=1.5 mm.

The size of the noise reduction structure 10 corresponding to S4 is: l=65 mm, h=8 mm, r=20 mm, d=1 mm.

From a comprehensive view in fig. 5, the noise reduction structure 10 provided by the embodiment of the application can obviously isolate sound waves above 800 Hz.

In addition, comparing S1 and S3, or S2 and S4, it can be known that, if the size of L is increased appropriately, the isolation effect of the noise reduction structure 10 on the sound wave of the lower frequency band can be improved under the condition that other size parameters are unchanged. Therefore, in practical applications, the isolation effect of the noise reduction structure 10 on the lower frequency band sound can be improved by increasing the volume of the cavity 111.

In addition, based on S1 and S3, it is known by comparing S2 that if the d size is reduced appropriately, the isolation effect of the noise reduction structure 10 on the sound wave of the lower frequency band can be improved. Therefore, in practical applications, the isolation effect of the noise reduction structure 10 on the lower frequency band sound can be improved by increasing the volume of the cavity 111.

Alternatively, it will be appreciated that if the side wall 115 and the through hole 116 are not provided between the cavity 111 and the channel 114, the side length and width of the cavity 11 need to be greater than 10cm to provide good isolation of sound waves around 800 Hz. The overall size of the cavity 11 is large and requires more material to make. When the 3D printing process is adopted for manufacturing, a large 3D printer is required, so that the manufacturing cost is increased significantly. In transportation, a large space is required, and thus, transportation costs are increased. When in use, the method can only be used in larger application scenes, has larger limitation and is not beneficial to wide application. For example, if the noise reducing structure 10 is to be used in a window frame, the window frame needs to be sized larger than the cavity 11. Alternatively, when the noise reduction structure 10 is applied to a duct of a fresh air system, the cross-sectional size of the duct needs to be larger than the size of the cavity 11.

In the noise reduction structure 10 provided by the application, the material consumption and the manufacturing cost can be saved due to the smaller size, and in addition, the transportation cost can be reduced, so that the noise reduction structure can be widely applied in smaller scenes.

It will be appreciated that in practical applications, the size of the noise reduction structure 10 may be reasonably set according to practical requirements.

For example, the side dimension L of the cavity 11 may be greater than or equal to 50mm and less than or equal to 65mm. The width dimension H of the cavity 11 may be greater than or equal to 2mm and less than or equal to 15mm. The diameter of the channel 114 may be greater than 2mm, for example, the diameter of the channel 114 may be greater than or equal to 10mm and less than or equal to 30mm. In addition, the side length or diameter of the through hole 116 may be less than or equal to H. The area of the first port 114a of the channel 114 may have an area ratio of 1% to 80% at the first outer surface 112. Of course, to achieve both ventilation and noise reduction, the cross-sectional area of the first port 114a of the channel 114 may be 10% to 50% of the area of the first outer surface 112. Accordingly, the area ratio of the cross-sectional area of the second port 114b of the channel 114 at the second outer surface 113 may be 1% to 80%. Of course, the area ratio of the sectional area of the second port 114b of the passage 114 at the second outer surface 113 may be 10% to 50% in order to achieve both ventilation and noise reduction effects. In general, the larger the cross-sectional area of the channel 114, the better the ventilation effect, but the noise reduction effect of the noise reduction structure 10 is reduced. Accordingly, the smaller the cross-sectional area of the channel 114 is, the ventilation effect is reduced, but the noise reduction effect of the noise reduction structure 10 is improved, so that in practical application, the size of the channel 114 can be reasonably set according to the actual requirement, which is not described herein.

In a specific application, the cavity 11 may include one cavity 111, or may include two or more cavities 111.

For example, as shown in fig. 6 and 7, in another example provided by the present application, a partition 117 is provided in the cavity (not shown in the drawings), and the partition 117 divides the cavity into four cavities. For convenience of explanation, the four cavities are hereinafter described as sub-cavity 111a, sub-cavity 111b, sub-cavity 111c, and sub-cavity 111d, respectively.

In addition, four through holes are provided, which are through hole 116a, through hole 116b, through hole 116d, and through hole 116d, respectively. Wherein the subcavities 111a communicate with the channel 114 through the through holes 116 a; the subcavities 111b communicate with the channels 114 through the through holes 116 b; the subcavities 111c communicate with the channel 114 through the through holes 116 c; the subcavities 111d communicate with the channels 114 through the through holes 116d.

The volumes of the four subcavities may be the same or substantially the same for a particular application. I.e. the partition 17 may equally divide the space within the cavity 11. Alternatively, at least two of the four subcavities may have different volumes. For example, the volumes of the sub-cavities 111a, 111b, 111c, and 111d may be the same. Alternatively, the volume of the sub-cavity 111a may be greater than or less than the volumes of the sub-cavity 111b, the sub-cavity 111c, and the sub-cavity 111d.

It should be noted that, the structures formed by the cavities (e.g., sub-cavity 111 a) and the through holes (e.g., through hole 116 a) with different dimensions have different natural frequencies, and resonance is induced when external vibration is the same as or close to the natural frequency of the structure formed by the cavities and the through holes. In practical applications, when external disturbance (such as sound wave) is the same as or close to the natural frequency of the structure formed by the cavity and the through hole, the structure formed by the cavity and the through hole can effectively isolate the frequency and the sound wave near the frequency.

For example, as shown in fig. 5, in the noise reduction structure 10 corresponding to S1, the natural frequency of the noise reduction structure 10 is about 1500Hz. Therefore, the noise reduction structure 10 has obvious isolation effect on sound waves with the frequency of about 1500Hz, and the sound insulation amount can reach 32dB.

In the noise reduction structure 10 corresponding to S2, the natural frequency of the noise reduction structure 10 is about 1000Hz. Therefore, the noise reduction structure 10 has obvious isolation effect on sound waves with the frequency of about 1000Hz, and the sound insulation amount can reach 43dB.

In the noise reduction structure 10 corresponding to S3, the natural frequency of the noise reduction structure 10 is about 1200Hz. Therefore, the noise reduction structure 10 has obvious isolation effect on sound waves with the frequency of about 1200Hz, and the sound insulation amount can reach 22dB.

In the noise reduction structure 10 corresponding to S4, the natural frequency of the noise reduction structure 10 is about 800Hz. Therefore, the noise reduction structure 10 has obvious isolation effect on sound waves with the frequency of about 800Hz, and the sound insulation amount can reach 18dB.

Therefore, in the embodiment provided by the application, when the cavity 11 includes a plurality of cavities 111, and the volumes of the cavities 111 are different, a good isolation effect can be achieved for sound waves in different frequency bands. When the volumes of the plurality of cavities 111 are the same, the isolation effect of sound waves of a specific frequency band can be increased. It should be noted that, the structure formed by the cavity 111 and the through hole 116 forms a helmholtz resonator, and when the sizes of the cavity 111 and the through hole 116 are different, the resonance frequency of the formed helmholtz resonator also changes, so in practical application, a good isolation effect on sound waves of different frequency bands can be achieved by adjusting the aperture of the through hole 116. Alternatively, the volume of the cavity 111 and the aperture of the through hole 116 may be simultaneously adjusted to obtain a desired noise reduction effect.

In general, in practical applications, the cavity 11 may include one cavity 111, or may include two, three, or more cavities 111, where each cavity 111 may communicate with the channel 114 through a corresponding through hole 116. In addition, when two or more cavities 111 are included in the cavity 11, the volumes of the cavities 111 may be the same or different. The apertures of the through holes 116 may be the same or different.

In the above examples, the cavity 11 is square, and the cross section of the channel 114 is circular, so that the shape of the noise reduction structure 10 may be varied in specific applications.

For example, as shown in FIG. 8, in another example provided by the present application, the cross-sectional shape of the channel 114 may be square.

Alternatively, as shown in fig. 9, in another example provided by the present application, the cavity 11 may be a generally triangular sheet structure, with the cross-sectional shape of the channel 114 being triangular. The cavity 11 includes three cavities (not shown) therein, and the shape of the dummy surface of each cavity is triangular.

In general, in practical applications, the cavity 11 may be a square, triangle, rectangle or other polygonal sheet structure, or may be a round, oval or irregular sheet structure, and the shape of the cavity 11 is not limited in the present application.

The cross-sectional shape of the channel 114 may be square, triangular, rectangular or other polygonal shape, or may be circular, elliptical or irregular, and the cross-sectional shape of the channel 114 is not limited in the present application.

The number of the cavities 111 may be at least two, and the number and shape of the cavities 111 are not limited in the present application.

The cross-sectional shape of the through hole 116 may be square, triangular, rectangular, or other polygonal shape, or may be circular, elliptical, or irregular, and the cross-sectional shape of the through hole 116 is not limited in the present application.

In practice, the cavity 111 may not be filled with a medium. Alternatively, the medium within the cavity 111 may be the same as the medium of the fluid of the noise reduction structure 10 in the application scenario. For example, when the noise reducing structure 10 is used in a scene such as a door or window, the medium within the cavity 111 may be air. When the noise reducing structure 10 is applied in a waterway, the medium within the cavity 111 may be water.

Of course, in other embodiments, the cavity 111 may be filled with other media. For example, the cavity 111 may be filled with a volume-expanding material to alter the sound-insulating properties of the noise reduction structure 10. The capacity-expanding material may include porous materials such as gel, porous ceramics, foam, etc., and may also include materials with a material density lower than that of the cavity 11.

As shown in fig. 10, an embodiment of the present application provides a simulation data diagram of the sound insulation amount after the cavity 111 of the noise reduction structure 10 is filled with the capacity-expanding material and when the capacity-expanding material is not filled.

In fig. 10, the abscissa indicates the frequency of sound in Hz. The ordinate indicates the sound insulation in dB. S5 represents a simulation curve of the noise reduction structure 10 without the capacity-expanding material filled. S6 represents a simulation curve of the noise reduction structure 10 after filling the dilatant material.

As is evident from a comparison of S5 and S6, the low frequency range of the noise reducing structure 10 may extend from above 800Hz to above 600Hz when filled with a volume-expanding material. That is, the capacity-expanding material is filled in the cavity 111, so that the isolation effect of the noise reduction structure 10 on the lower frequency band sound can be effectively improved. Or, it can be understood that, since the volume of the cavity 111 is reduced, the isolation effect on the lower frequency band sound is weakened, and when the volume-expanding material is used, the problem that the isolation effect on the lower frequency band sound is reduced due to the reduced volume of the cavity 111 can be neutralized, that is, the size of the noise-reducing structure 10 can be smaller by using the volume-expanding material, and the noise-reducing effect is better.

Of course, in practical applications, when the noise reduction structure 10 includes two or more cavities 111, the capacity-expanding material may be selectively filled in at least one cavity 111, which is not described herein.

In other embodiments, other structures may be added to the noise reduction structure 10 to improve the noise reduction effect.

For example, a sound deadening line may be provided in the noise reducing structure 10.

Specifically, as shown in fig. 11, sound deadening line 118 may include a first end 1181 and a second end 1182, wherein first end 1181 is an open end and second end 1182 is a closed end. The sound absorption principle of the sound absorption pipeline 118 is that when sound enters the sound absorption pipeline 118 from the first end 1181 and propagates in the sound absorption pipeline 118, a medium (such as air) in the sound absorption pipeline 118 and the inner wall of the sound absorption pipeline 118 rub against each other, so that a thermal viscous effect is generated, and energy of sound waves is converted into heat energy to be consumed. The faster the medium molecules move, the more pronounced the resulting thermal viscous effect. Thus, in practice, the cross-sectional area of sound-deadening line 118 may be relatively small, for example, when the cross-sectional shape of sound-deadening line 118 is circular, the cross-sectional diameter may be less than 1mm. In addition, the longer the length of the muffler pipe 118, the larger the friction area between the medium and the muffler pipe 118, and the more remarkable the muffler effect. Therefore, in practical applications, the length of the muffler pipe 118 may be set relatively long. Of course, the present application is not limited to the cross-sectional shape and length of the acoustic line 118. In addition, when the frequency of the sound wave is the same as or close to the natural frequency of the sound-deadening line 118, resonance is induced, and at this time, friction between the medium and the inner wall of the sound-deadening line 118 is strong, and the sound absorption effect of the sound-deadening line 118 is remarkable. Parameters such as the cross-sectional area, the length, the shape and the like of the sound-deadening line 118 affect the natural frequency of the sound-deadening line 118, so in practical application, the parameters such as the cross-sectional area, the length, the shape and the like of the sound-deadening line 118 can be designed and adjusted accordingly according to practical requirements.

In a specific noise reduction structure, the noise reduction pipe 118 may be directly connected to the channel 114, or may be connected to the channel 114 through the cavity 111.

For example, as shown in fig. 12 and 13, in one example provided by the present application, the muffler line may be in direct communication with the passage 114. Specifically, the noise reduction structure 10 includes four sub-cavities and four silencing pipelines. The four sub-cavities are a sub-cavity 111a, a sub-cavity 111b, a sub-cavity 111c and a sub-cavity 111d respectively; the four silencer lines are silencer line 118a, silencer line 118b, silencer line 118c and silencer line 118d, respectively. Taking sound deadening line 118a and subcavity 111a as an example, sound deadening line 118a has an open first end 1181a and a closed second end 1182a. First end 1181a of sound deadening line 118a communicates with passage 114, i.e., first end 1181a of sound deadening line 118a is located on side wall 115 of passage 114. As the sound waves pass through the channel 114, a portion of the sound waves enter the sound attenuating conduit 118a from the first end 1181a for propagation, and thus the sound attenuating conduit 118a may attenuate the propagation of the sound waves. In addition, the silencing pipeline 118a may be disposed along the outer contour of the sub-cavity 111a, so that the silencing pipeline 118a may have a larger length, which is beneficial to enhancing the silencing effect of the silencing pipeline 118 a. In addition, the silencing pipeline 118a does not occupy too much space, so that the volume of the sub-cavity 111a is not significantly reduced, which is beneficial to ensuring the isolation effect of the noise reduction structure 10 on the sound waves of lower frequency band.

In addition, as shown in fig. 14 and 15, in another example provided by the present application, the muffler pipe may communicate with the passage through the cavity. Specifically, the noise reducing structure 10 may include four sub-cavities and eight silencing lines. The four sub-cavities are a sub-cavity 111a, a sub-cavity 111b, a sub-cavity 111c and a sub-cavity 111d respectively; the eight muffler pipes are muffler pipe 118a, muffler pipe 118b, muffler pipe 118c, muffler pipe 118d, muffler pipe 118e, muffler pipe 118f, muffler pipe 118g, and muffler pipe 118h, respectively.

Take as an example, muffler line 118a, muffler line 118h, and subcavity 111 a. Muffler line 118a has an open first end 1181a and a closed second end 1182a, and muffler line 118h has an open first end 1181h and a closed second end 1182h. First end 1181a of sound deadening line 118a, first end 1181h of sound deadening line 118h are located within subcavity 111 a. I.e., first end 1181a of sound deadening line 118a and first end 1181h of sound deadening line 118h may be in communication with pipe 114 through subcavity 111 a. When the sound wave propagates in the sub-cavity 111a, a part of the sound wave enters the sound-deadening line 118a from the first end 1181a to propagate, and a part of the sound wave enters the sound-deadening line 118h from the first end 1181h to propagate, so that the sound-deadening lines 118a and 118h can attenuate the propagation of the sound wave.

In addition, the sub-cavity 111a is configured to reduce noise by using the resonance principle, so in practical application, the natural frequency of the noise reduction pipe 118a and the resonance frequency of the sub-cavity 111a may be the same or substantially the same, so as to enhance the resonance of the sub-cavity 111a, thereby enhancing the isolation effect of the noise reduction structure 10 on the sound wave.

When the sound-deadening line 118a is provided, the sound-deadening line 118a may be provided on the side of the sub-cavity 111a away from the through hole 116a, so as to ensure that sound waves can smoothly enter the sub-cavity 111a through the through hole 116 a.

In addition, the silencing pipeline 118a may be arranged in a folded (or S-shaped) manner, so as to reduce the volume occupied by the silencing pipeline 118a, so that the volume of the sub-cavity 111a is not significantly reduced, and the isolation effect of the noise reduction structure 10 on the sound waves of the lower frequency band is advantageously ensured. In addition, the length of the silencing pipeline 118a can be larger, which is beneficial to improving the silencing effect of the silencing pipeline 118 a.

It should be noted that, in the above exemplary description taking the silencing line 118a and the sub-cavity 111a as an example, when other silencing lines and sub-cavities are set, the same or similar setting may be performed according to the above silencing line 118a and sub-cavity 111a as an example, which is not described herein.

It will be appreciated that the noise reduction is achieved by using the thermal viscous effect of the noise reduction circuit, and therefore, in practical applications, the sound wave is not completely consumed, i.e. there is a residual sound wave. Thus, in some embodiments, two sound attenuating lines may be in communication, allowing the residual sound waves to be consumed by each other.

Specifically, as shown in fig. 16, by way of example, muffler line 118a and muffler line 118h, in the example provided by the present application, muffler line 118a and muffler line 118h communicate with each other.

Referring to fig. 15 and 16 in combination, in fig. 16, it can also be understood that the partition 17 in fig. 15 is eliminated.

It will be appreciated that in the example of fig. 15 and 16, a first end (e.g., first end 1181 a) of each of the sound attenuating conduits (e.g., sound attenuating conduit 118 a) is located within a subcavity (e.g., 111 a). I.e., each muffler pipe may be in communication with the passage 114 through a subcavity.

Of course, please refer to fig. 13 and fig. 15 in combination. In other embodiments, the first end of at least one of the muffler pipes (e.g., muffler pipe 118a in fig. 13) may be located on side wall 115 of passage 114. In general terms, the first end of each silencer duct may be located on the side wall of the channel or may be located in the sub-cavity. Alternatively, there may be a case where the first end of at least one silencing pipe is located at the side wall of the passage and the first end of at least one silencing pipe is located in the sub-cavity.

It should be noted that, in practical applications, the noise reduction structure 10 may include one cavity 111, or may include two or more cavities 111. In addition, the noise reduction structure 10 may include one noise reduction pipe 118, or may include two or more noise reduction pipes 118, where the number of the cavities 111 and the noise reduction pipes 118 may be the same or different, which is not described herein.

Further, the muffler pipe 118 may be formed by providing a partition plate in the cavity 111. Or may be formed of a separate tube disposed within the cavity 111. The specific manner in which the damper conduit 118 is formed is not limited by the present application.

In addition, the noise reducing structure 10 may rely on the cavity 111 to isolate sound when specifically configured. Alternatively, the sound insulation characteristics of the noise reduction structure 10 may be adjusted by filling the cavity 111 with a volume-expanding material. Alternatively, the sound isolation characteristics of the noise reduction structure 10 may be adjusted by the sound attenuation line 118. It should be noted that, when the noise reduction structure 10 includes both the noise reduction pipe 118 and the capacity-expanding material, the capacity-expanding material may be disposed only in the cavity 111. Because the noise reduction pipeline 118 is noise reduced by the thermal viscous effect, the pipe diameter of the noise reduction pipeline 118 is small, and the capacity-expanding material is difficult to fill in the noise reduction pipeline 118. In addition, when the volume-expanding material is filled in the muffler pipe 118, propagation of sound waves in the muffler pipe 118 is hindered, and thus, the sound absorption effect of the muffler pipe 118 may be reduced. Of course, in other embodiments, the capacity-expanding material may be filled in the silencing pipe 118 according to actual requirements, which is not limited by the present application.

As shown in fig. 17 to 19, the embodiment of the present application also provides simulated data graphs of the noise reduction effect of three different noise reduction structures 10. In fig. 17 to 19, the abscissa indicates the frequency of sound in Hz. The ordinate indicates the sound insulation in dB.

Shown in fig. 17 is a simulated data diagram of the noise reduction effect of the noise reduction structure 10 that relies solely on the cavity to isolate sound. The specific structure of the noise reduction structure 10 may refer to fig. 7, and will not be described herein.

Shown in fig. 18 is a simulated data diagram of the noise reduction effect of the noise reduction structure 10 with a cavity filled with a volume-expanding material. The specific structure of the noise reduction structure 10 may refer to fig. 7, and each sub-cavity is filled with a capacity-expanding material.

Shown in fig. 19 is a simulated data diagram of the noise reduction effect of the noise reduction structure 10 having a cavity and a sound deadening line. The specific structure of the noise reduction structure 10 may refer to fig. 16, and will not be described herein.

That is, in practical application, the structure of the noise reduction structure 10 may be specifically designed according to practical requirements, so as to obtain the required noise reduction characteristics.

In addition, as shown in fig. 20, in an example provided by the present application, the noise reduction structure 10 may further include a filter screen 119, where the filter screen 119 is used to cover a channel (not shown in the drawing), so as to perform functions such as filtering or blocking. For example, the filter 119 may filter impurities such as dust, pollen, lint, etc. to perform a certain cleaning function. Alternatively, the screen 119 may also provide an effective barrier to mosquitoes.

When specifically configured, as shown in fig. 20, a screen 119 may be disposed within the channel and connected to the side wall 115 of the channel.

Of course, in other embodiments, the filter screen 119 may be attached to the first outer surface 112 or the second outer surface 113 of the cavity 11, or may be disposed on both the first outer surface 112 and the second outer surface 113. The present application is not limited in the arrangement and connection between the screen 119 and the chamber 11.

In addition, in practical applications, a plurality of noise reduction structures 10 may be used as a noise reduction assembly.

For example, as shown in fig. 21, in a noise reduction assembly 30 provided by the present application, a connection structure 31, a noise reduction structure 10a, and a noise reduction structure 10b are included. Wherein the noise reduction structure 10a and the noise reduction structure 10b are connected by a connection structure 31.

Specifically, taking the noise reduction structure 10a as an example, the cavity 11a has a connection portion 110a, and the connection portion 110a is located between the first outer surface 112a and the second outer surface 113a, the connection portion 110a is located at one side of the cavity 11a, and the connection structure 31 is connected to the connection portion 110 a. The connection portion 110a may be an area of the side edge, and glue may be applied to the area to achieve connection between the connection structure 31 and the connection portion 110 a. Alternatively, the connection portion 110a may have some structures with a connection function, such as a buckle or a screw hole, and the connection structure 31 and the connection portion 110a may be connected by a snap connection or a screw connection. It is to be understood that the specific shape structure of the connection portion 110a and the connection manner between the connection structure 31 and the noise reduction structure 10a are not limited in the present application.

The connection structure 31 may be a rigid connection, a flexible connection or a foldable structure.

For example, when the connection structure 31 is a rigid connection member, the connection structure 31 may be a connection member having good structural strength such as a metal plate. I.e. the noise reducing structures 10a and 10b may be firmly connected by the connection structure 31 to ensure a relative position between the noise reducing structures 10a and 10 b.

Alternatively, when the connection structure 31 is a foldable structure, the connection structure 31 may be a hinge or the like. I.e. the relative position between the noise reducing structures 10a and 10b may be varied.

Alternatively, when the connection structure 31 is a flexible connection, the connection structure 31 may be a film, a wire, a string, or the like. I.e. the relative position between the noise reducing structures 10a and 10b may be varied.

As shown in fig. 21, when the connection structure 31 is a film, the connection structure 31 may be connected to the side edges of the noise reduction structures 10a and 10 b.

Alternatively, as shown in fig. 22, the connection structure 31 may be attached to the first outer surface 112a and the first outer surface 112b. Of course, in other embodiments, films may be attached to the second outer surface 113a and the second outer surface 113b.

Alternatively, the connection structure 31 may completely cover the first outer surface 112a and the first outer surface 112b, so as to facilitate mass production. For example, in making, a plurality of noise reduction structures may be arranged in a desired location, and the first outer surface of each noise reduction structure may lie in the same plane. A film is then attached to the first outer surface of each noise reduction structure.

It should be noted that, through holes with a cross-sectional area larger than that of the channels may be formed at positions of the thin film corresponding to the channels (such as the channels 114), so as to avoid the thin film from blocking the channels. Alternatively, a plurality of small through holes may be formed at the position of the thin film corresponding to the channel to form a filter screen structure.

Alternatively, as shown in fig. 23, the connection structure 31 may be a filter screen, that is, the connection structure 31 may have both functions of connection and filtration.

It will be appreciated that in the above example, only two noise reduction structures are taken as an example, and in practical application, the number of noise reduction structures 10 included in the noise reduction assembly 30 may be reasonably adjusted according to practical requirements.

For example, as shown in fig. 24, in a noise reduction assembly 30 provided by the present application, a plurality of noise reduction structures 10 (8×10=80) are included, the plurality of noise reduction structures 10 are arranged in a rectangular array, and two adjacent noise reduction structures 10 are connected by a connection structure (not shown in the figure). Wherein the connection structure may be a flexible connection or a foldable structure. I.e. the position between two adjacent noise reducing structures 10 may be varied.

In fig. 24, the noise reduction assembly 30 is in a tiled state. As shown in fig. 25, the noise reduction assembly 30 is in a folded state. When the noise reduction assembly 30 is carried, the occupied area of the noise reduction assembly 30 can be effectively reduced, so that the convenience in carrying can be improved. In addition, the use space can be reduced, and the flexibility in use is improved.

In practice, the noise reducing structure 10 may be used in a workstation bulkhead, a wall panel, a screen, a door curtain, or a sunroof panel in a vehicle.

Alternatively, the noise reduction structure 10 can be applied to a pipeline of a fresh air system.

Alternatively, the noise reducing structure 10 may be used as a window screen.

For example, as shown in fig. 26, in a window screen 20 provided by the present application, a window frame 21 and a noise reduction assembly (not shown) are included. The window frame 21 includes an upper fixed frame 211 and a lower movable frame 212, and the movable frame 212 can slide up and down with respect to the fixed frame 211. The upper end of the noise reduction assembly is connected with the fixed frame 211, and the lower end thereof can be connected with the movable frame 212. The noise reduction assembly may be folded when the movable frame 212 slides upward. The noise reduction assembly may be deployed when the movable frame 212 slides down.

The movable frame 212 may slide by the action of a human hand, or may slide by a driving device such as a motor. Of course, in specific application, the driving device such as the motor can be connected into the scene of the smart home to realize intelligent adjustment on the folding or unfolding state of the noise reduction assembly, which is not described herein.

The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (20)

1. A noise reduction structure, comprising:

the cavity is provided with a cavity, and the cavity is provided with a first outer surface and a second outer surface which are opposite;

the cavity also has a channel with a first port and a second port, the first port being located on the first outer surface and the second port being located on the second outer surface;

the side wall of the channel is provided with a through hole, and the channel and the cavity are communicated through the through hole.

2. The noise reducing structure of claim 1, further comprising a sound attenuating conduit comprising a first end and a second end, the first end being an open end and the second end being a closed end;

the first end is in communication with the channel.

3. The noise reducing structure of claim 2, wherein the first end is located at a side wall of the channel or the first end is located within the cavity.

4. A noise reducing structure according to claim 2 or 3, wherein the sound attenuating conduit is arranged along the outer contour of the cavity.

5. A noise reducing structure according to claim 2 or 3, wherein the sound attenuating conduit is located on a side of the cavity remote from the through hole.

6. The noise reducing structure of claim 5, wherein the sound attenuating conduit is S-shaped.

7. The noise reducing structure according to any one of claims 2 to 6, wherein a natural frequency of the sound deadening line is the same as a natural frequency of the cavity.

8. The noise reducing structure according to any one of claims 2 to 7, wherein the noise reducing structure includes at least two of the muffler pipes, and at least two of the muffler pipes communicate with each other.

9. The noise reducing structure of any one of claims 1 to 8, further comprising a baffle disposed within the cavity and dividing the cavity into at least two subcavities.

10. The noise reducing structure of claim 9, wherein at least two of said sub-cavities differ in volume among said at least two sub-cavities.

11. The noise reducing structure of any one of claims 1 to 10, further comprising a screen that covers the channel.

12. The noise reducing structure of any one of claims 1 to 11, further comprising a volume-expanding material filled within the cavity.

13. The noise reducing structure of claim 12, wherein the volume-expanding material comprises at least one of a gel, a porous ceramic, or a foam.

14. The noise reducing structure according to any one of claims 1 to 13, wherein the cavity is a square sheet, and a side length dimension of the cavity is greater than or equal to 50mm and less than or equal to 65mm; and/or the number of the groups of groups,

the width dimension of the cavity is greater than or equal to 2mm and less than or equal to 15mm.

15. The noise reducing structure of any one of claims 1 to 14, wherein the area ratio of the first port at the first outer surface is 10% to 50%; and/or the number of the groups of groups,

the area of the second port on the second outer surface is 10% to 50%.

16. The noise reducing structure of any of claims 1-15, wherein the diameter of the channel is greater than or equal to 2mm.

17. A noise reduction assembly comprising a connection structure and at least two noise reduction structures as claimed in any one of claims 1 to 16;

the two adjacent noise reduction structures are connected through the connecting structure.

18. The noise reduction assembly of claim 17, wherein the cavity has a connection portion between the first outer surface and the second outer surface, the connection structure being connected to the connection portion; and/or the number of the groups of groups,

the connection structure is connected to the first outer surface or the second outer surface.

19. The noise reduction assembly of claim 17 or 18, wherein the connection structure comprises: any of a rigid connection, a flexible connection, or a collapsible structure.

20. The noise reduction assembly of any one of claims 17 to 19, wherein the noise reduction structure is: partition, wall panel, screen, door curtain or window screening.