Sealing strip and automobile

Abstract

The invention relates to a sealing strip and an automobile, and the sealing strip comprises a sealing part and an acoustic metamaterial structure; the sealing part forms an accommodating cavity; the acoustic metamaterial structure is arranged in the accommodating cavity; the acoustic metamaterial structure comprises a cavity structure and an acoustic metamaterial unit arranged on one side of the cavity structure; wherein the cavity structure is provided with a resonant cavity, and the resonant cavity is provided with a first opening close to the acoustic metamaterial unit; the acoustic metamaterial unit comprises a film and a mass block, the film blocks the first opening of the resonant cavity, and the mass block is arranged on the side, away from the resonant cavity, of the film. The sound insulation and noise reduction capacity of the sealing strip is high.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, and in particular to a sealing strip and an automobile. Background Art

[0002] With the development of automobile industry technology, people have higher and higher requirements for various performance of automobiles, and pay more attention to comfort and quality. As a direct impression of automobile quality, the sound of closing the door has become one of the hot topics of the entire industry. Studies have shown that door locks, sealing strips, damping blocks and interior panels have a direct impact on the quality of door closing sound, and sealing strips have a more significant impact on the quality of door closing sound. As an important component of the car body, the door sealing strip plays a key role in maintaining the quietness of the vehicle's internal environment and providing the necessary dustproof, waterproof and windproof functions. Most of the existing sealing strips have a relatively simple structure, which has a certain effect on the quality of door closing sound, but the effect of sound insulation and noise reduction is poor. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the sound insulation and noise reduction effect of the sealing strip is poor.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] According to a first aspect of the present application, a sealing strip is provided, comprising: a sealing portion and an acoustic metamaterial structure; the sealing portion forms a containing cavity; the acoustic metamaterial structure is arranged in the containing cavity; the acoustic metamaterial structure comprises a cavity structure and an acoustic metamaterial unit arranged on one side of the cavity structure; wherein the cavity structure has a resonance cavity, and the resonance cavity has a first opening close to the acoustic metamaterial unit; the acoustic metamaterial unit comprises a film and a mass block, the film blocks the first opening of the resonance cavity, and the mass block is arranged on a side of the film away from the resonance cavity.

[0006] According to the above technical means, since the mass block is arranged on the side of the film away from the resonance cavity, the mass block can change the original amplitude of the film, so that the sound wave resonates with the film, and the amplitude of the film is increased, thereby converting the sound wave energy into the mechanical vibration energy of the film, thereby consuming a large amount of sound wave energy and improving the sound absorption and noise reduction performance of the acoustic metamaterial structure. In addition, the film blocks the first opening of the resonance cavity in the cavity structure, so that when the sound wave is incident on the acoustic metamaterial structure, the sound wave will be transmitted between the resonance cavity and the film, and the sound wave will not only vibrate the film, but also vibrate the air in the resonance cavity. When the vibration frequency of the air in the resonance cavity matches the vibration frequency of the resonance cavity, the air in the resonance cavity resonates with the resonance cavity, and the vibration of the resonance cavity interacts with the vibration of the film to achieve coupling, change the natural frequency of the acoustic metamaterial structure, and distribute the energy of the sound wave between the vibration of the film and the resonance cavity, thereby consuming a large amount of sound wave energy, so that the sealing strip can achieve the effect of sound insulation and noise reduction.

[0007] In a possible implementation, the acoustic metamaterial structure includes at least two acoustic metamaterial units; and the at least two acoustic metamaterial units are stacked in sequence on one side of the cavity structure.

[0008] According to the above technical means, the sealing strip provided by the present application, by arranging at least two acoustic metamaterial units in the acoustic metamaterial structure, the structural parameters of the at least two acoustic metamaterial units can be set to be different, so that the acoustic metamaterial structure has different sound insulation effects, and the sound absorption effect and sound insulation effect between the at least two acoustic metamaterial units can complement each other, which can not only improve the overall sound absorption effect and sound insulation effect of the sealing strip, but also ensure the reliability of the sound absorption effect and sound insulation effect of the sealing strip during long-term use.

[0009] In a possible implementation manner, the tensions of the films of at least two of the acoustic metamaterial units are equal.

[0010] According to the above technical means, the sealing strip provided by the present application has equal tensions of the films of at least two of the acoustic metamaterial units, so that at least two films have consistent responses to sound waves of the same frequency, and the vibration modes and amplitudes at the same frequency are more matched, which helps to maintain uniform acoustic performance throughout the acoustic metamaterial structure and helps to enhance the overall sound insulation effect of the acoustic metamaterial structure. And because the tension of the film may change due to environmental factors such as temperature and humidity, if the tensions of the two films are equal, then the degree to which they are affected by environmental factors may also be closer, which helps to maintain the stability of the entire acoustic metamaterial structure.

[0011] In a possible implementation, in one of the acoustic metamaterial units, the number of the mass block is 1, which is located at the center of the film.

[0012] According to the above technical means, the sealing strip provided by the present application has a mass block arranged in an acoustic metamaterial unit and located at the center of the film, so that such a mass block can serve as a clear vibration node, so that the acoustic metamaterial unit resonates at a specific frequency. This resonance helps to improve the acoustic performance of the acoustic metamaterial unit within the target frequency range, thereby improving the sound absorption or sound insulation effect.

[0013] In a possible implementation, at least two of the acoustic metamaterial units include a first acoustic metamaterial unit and a second acoustic metamaterial unit; the first acoustic metamaterial unit includes a first film, on which a first mass block is disposed; the second acoustic metamaterial unit includes a second film, on which a second mass block is disposed; the tension of the first film is equal to the tension of the second film, and the masses of the first mass block and the second mass block are unequal.

[0014] According to the above technical means, the sealing strip provided by the present application, under the condition that the tension of the first film and the tension of the second film are equal, by making the masses of the first mass block and the second mass block unequal, not only makes the sound wave manipulation effect more obvious and stable, but also makes the frequency control means more flexible. The masses of the first mass block and the second mass block are unequal, thereby making the first acoustic metamaterial unit and the second acoustic metamaterial unit have different resonance frequencies, thereby enabling the acoustic metamaterial structure to achieve effective sound wave control within a wide frequency range, which can optimize the acoustic performance of the acoustic metamaterial structure at different frequencies and improve the sound absorption or sound insulation effect within a specific frequency range.

[0015] In a possible implementation manner, the shape of the mass block includes a cylinder or a cube.

[0016] According to the above-mentioned technical means, the sealing strip provided by the present application has a mass block whose shape includes a cylinder or a cube, so that the stress distribution of the mass block on the film can be uniform and local stress concentration can be avoided; it is also beneficial to make the mass block easier to position and fix on the film, which helps to achieve precise assembly and layout.

[0017] In a possible implementation, the acoustic metamaterial unit further includes: two fixing frames, respectively disposed on two sides of the film, for fixing the edge of the film so that the film is in a tensioned state.

[0018] According to the above-mentioned technical means, the sealing strip provided in the present application fixes and tensions the edge of the film through two fixed frames, so that the film can better exert its elastic material characteristics. When sound waves act on the film, it can more effectively generate resonance and dissipate the energy of the sound waves. It can also effectively prevent the film from loosening or deforming during use, thereby enhancing the stability and durability of the overall structure of the acoustic metamaterial unit.

[0019] In a possible implementation, the acoustic metamaterial structure includes at least two acoustic metamaterial units, and there is one fixing frame between the films of two adjacent acoustic metamaterial units.

[0020] According to the above technical means, the sealing strip provided by the present application, the acoustic metamaterial structure includes at least two of the acoustic metamaterial units, and the films of two adjacent acoustic metamaterial units share a fixed frame, which not only reduces the amount of material used in the fixed frame and reduces the manufacturing cost; it also helps to enhance the stability of the connection between the two adjacent acoustic metamaterial units and prevent relative displacement or deformation between the two adjacent acoustic metamaterial units, thereby improving the durability and reliability of the overall structure; in addition, the volume of the acoustic metamaterial structure is also reduced, which is conducive to integrating the acoustic metamaterial structure into various applications.

[0021] In a possible implementation, a first through hole is provided on a side wall of the cavity structure, and a second through hole is provided on a side wall of the accommodating cavity, and axes of the first through hole and the second through hole coincide with each other.

[0022] According to the above technical means, the sealing strip provided in the present application is provided with a first through hole on the side wall of the cavity structure so that the cavity structure forms a Helmholtz resonance cavity. On this basis, the parameters of the Helmholtz resonance cavity are adjusted, such as the size of the first through hole or the volume of the Helmholtz resonance cavity, so as to obtain a specific resonance frequency to match the frequency of the sound wave to be absorbed. In this way, the noise reduction effect can be optimized, so that when the sound wave frequency is consistent with the resonance frequency of the film and the Helmholtz resonance cavity, the acoustic metamaterial structure will undergo a strong resonance phenomenon, so that the film and the Helmholtz resonance cavity will absorb and disperse a large amount of sound wave energy, thereby reducing the noise level.

[0023] In a possible implementation, the sealing portion includes a bottom wall; the resonance cavity has a second opening away from the acoustic metamaterial unit, and the bottom wall blocks the second opening of the resonance cavity.

[0024] According to the above technical means, the sealing strip provided by the present application uses the bottom wall of the sealing part to block the second opening of the resonance cavity, which helps to form a closed acoustic environment for the resonance cavity. In the closed resonance cavity, it is more conducive to the sound waves to effectively interact with the acoustic metamaterial unit, so that the sound waves are transmitted between the resonance cavity and the film of the acoustic metamaterial unit, and the sound wave energy is gradually converted into mechanical vibration energy, thereby dissipating the sound wave energy and improving the sound absorption effect of the sealing strip.

[0025] In a possible implementation, there are multiple acoustic metamaterial structures, and the multiple acoustic metamaterial structures are arranged in at least one row or at least one column in the accommodation cavity.

[0026] According to the above-mentioned technical means, in the sealing strip provided by the present application, there are multiple acoustic metamaterial structures, so that the sound absorption effect and sound insulation effect between the multiple acoustic metamaterial structures can complement each other, which is beneficial to improve the overall sound absorption effect and sound insulation effect of the sealing strip and meet the needs of different application scenarios. Multiple acoustic metamaterial structures can also ensure the reliability of the sound absorption effect and sound insulation effect of the sealing strip during long-term use.

[0027] In a possible implementation, the sealing portion and the cavity structure are both made of polyurethane.

[0028] According to the above-mentioned technical means, the materials of the sealing part and the cavity structure in the sealing strip provided in the present application both include polyurethane. Since polyurethane has a high Young's modulus and excellent mechanical properties, when the sealing strip is subjected to a collision, the stability of the accommodating cavity and the cavity structure can be maintained, thereby avoiding the sound absorption performance of the sealing strip from being reduced due to deformation of the accommodating cavity and the cavity structure, which not only improves the service life of the sealing strip, but also ensures its long-term stable noise suppression effect. In addition, the molecular chain activity of polyurethane materials is large, the molecular structure is highly designable, and the manufacturing process is simple, thereby reducing the production cost of the sealing strip and improving the production efficiency of the sealing strip.

[0029] According to a second aspect of the present application, there is provided an automobile, comprising: the sealing strip described in any one of the above embodiments, arranged on a door frame of the automobile.

[0030] Beneficial effects of the present invention:

[0031] (1) The sealing strip of the present application converts the sound wave energy into the mechanical vibration energy of the film and the resonance cavity, thereby consuming a large amount of sound wave energy and improving the sound insulation and noise reduction effect of the sealing strip.

[0032] (2) The sealing strip of the present application has good reliability in sound absorption and sound insulation effects during long-term use.

[0033] (3) The acoustic metamaterial structure in the sealing strip of the present application has good stability.

[0034] (4) The sealing strip of the present application is helpful to improve the acoustic performance of the acoustic metamaterial unit within the target frequency range, thereby helping to improve the sound absorption or sound insulation effect of the sealing strip.

[0035] (5) The sealing strip of the present application can achieve effective sound wave control within a wide frequency range, can optimize the acoustic performance of the acoustic metamaterial structure at different frequencies, and improve the sound absorption or sound insulation effect of the sealing strip within a specific frequency range.

[0036] (6) The sealing strip of the present application can more effectively generate resonance and dissipate the energy of sound waves; it can also effectively prevent the film from loosening or deforming during use, thereby enhancing the stability and durability of the overall structure of the acoustic metamaterial unit.

[0037] (7) The sealing strip of the present application can not only reduce the production cost of the sealing strip and improve the production efficiency of the sealing strip, but also maintain the stability of the accommodating cavity and the cavity structure when subjected to a collision.

[0038] It should be noted that the technical effects brought about by the implementation method of the second aspect of the present application can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0039] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Shown is a structural diagram of a sealing strip shown as an exemplary embodiment;

[0041] Figure 2 Shown is a structural diagram of an acoustic metamaterial structure shown as an exemplary embodiment;

[0042] Figure 3 A cross-sectional view of an acoustic metamaterial structure is shown as an exemplary embodiment;

[0043] Figure 4 An exploded view of an acoustic metamaterial structure is shown as an exemplary embodiment;

[0044] Figure 5 A structural diagram of another sealing strip is shown as an exemplary embodiment;

[0045] Figure 6 An exploded view of another acoustic metamaterial structure is shown as an exemplary embodiment;

[0046] In the figure, 100-sealing strip, M-sealing part, 10-acoustic metamaterial structure, 20-cavity structure, 30-acoustic metamaterial unit, D-resonance cavity, K1-first opening, K2-second opening, 31-film, 32-mass block, 301-first acoustic metamaterial unit, 302-second acoustic metamaterial unit, 311-first film, 321-first mass block, 312-second film, 321-second mass block, 33-fixing frame, g1-first through hole, g2-second through hole. DETAILED DESCRIPTION

[0047] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or relative positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is met.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In the present application, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0052] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0053] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0054] When closing the door while riding in a car, the contact between the door and the car body often produces a lot of noise, which affects the comfort of the ride. The door sealing strip mainly plays the role of sealing, waterproofing, dustproofing, vibration reduction and sound insulation. The car sealing strips in some embodiments are not only complex in structure and have high requirements for production, but also have large structural dimensions, which restricts installation and cannot be used in certain application scenarios. The sealing strips in some embodiments, due to their single material and simple structure, have poor noise suppression effect on low-frequency noise, especially noise in the low-frequency band below 500Hz, and it is difficult to effectively absorb the low-frequency sound waves generated when the door is closed.

[0055] To solve the above technical problems, refer to Figure 1 The embodiment of the present disclosure provides a sealing strip 100, comprising: a sealing portion M and an acoustic metamaterial structure 10; the sealing portion M forms a receiving cavity Q, and the acoustic metamaterial structure 10 is disposed in the receiving cavity Q. Figure 2 and Figure 3 The acoustic metamaterial structure 10 includes a cavity structure 20 and an acoustic metamaterial unit 30 arranged on one side of the cavity structure 20; wherein the cavity structure 20 has a resonance cavity D, and the resonance cavity D has a first opening K1 close to the acoustic metamaterial unit 30; the acoustic metamaterial unit 30 includes a film 31 and a mass block 32, the film 31 blocks the first opening K1 of the resonance cavity D, and the mass block 32 is arranged on a side of the film 31 away from the resonance cavity D.

[0056] In the sealing strip 100 provided in this embodiment, since the mass block 32 is arranged on the side of the film 31 away from the resonance cavity D, the mass block 32 can change the original amplitude of the film 31, so that the sound wave resonates with the film 31 and the amplitude of the film 31 is increased. The sound wave energy is converted into the mechanical vibration energy of the film 31, thereby consuming a large amount of sound wave energy and improving the sound absorption and noise reduction performance of the acoustic metamaterial structure 10. In addition, the film 31 blocks the first opening K1 of the resonance cavity D in the cavity structure 20, so that when the sound wave is incident on the acoustic metamaterial structure 10, the sound wave will be transmitted between the resonance cavity D and the film 31, and the sound wave will not only make the film 31 vibrate, but also make the air in the resonance cavity D vibrate. When the vibration frequency of the air in the resonance cavity D matches the vibration frequency of the resonance cavity D, the air in the resonance cavity D resonates with the resonance cavity D, and the vibration of the resonance cavity D interacts with the vibration of the film 31 to achieve coupling, thereby changing the natural frequency of the acoustic metamaterial structure 10, so that the energy of the sound wave is distributed between the vibration of the film 31 and the resonance cavity D, thereby consuming a large amount of sound wave energy, so that the sealing strip 100 can achieve the effect of sound insulation and noise reduction.

[0057] In some embodiments, the height of the acoustic metamaterial structure 10 is 4.45 mm. In other embodiments, the specific height of the acoustic metamaterial structure 10 can be designed according to the space size of the accommodating cavity Q in the sealing portion M, which is not limited in this embodiment.

[0058] In some embodiments, the density ρ of the mass block 32 is 2650 kg / m 3 ~2780kg / m 3 , for example 2650kg / m 3 、2700kg / m 3 、2750kg / m 3 or 2780kg / m 3 The elastic modulus E of the mass block 32 is 6.5×10 10 Pa~7.5×10 10 Pa, for example 6.5×10 10 Pa, 7×10 10 Pa, 7.2×10 10 Pa or 7.5×10 10 Pa. The Poisson's ratio v of the mass block 32 is 0.32-0.35, for example, 0.32, 0.33 or 0.35.

[0059] Exemplarily, the material of the mass block 32 includes aluminum. In other embodiments, the mass block 32 may also include other materials with a density ρ between 2650 kg / m 3 ~2780kg / m 3 In the range of elastic modulus E is 6.5×10 10 Pa~7.5×10 10 Pa range, and other materials with Poisson's ratio v in the range of 0.32 to 0.35.

[0060] In some embodiments, the material of the film 31 includes polyethylene. In other embodiments, the material of the film 31 may also include other elastic materials.

[0061] In some embodiments, the thickness of the film 31 is 0.70 mm to 0.80 mm, such as 0.70 mm, 0.72 mm, 0.75 mm or 0.80 mm. The thickness of the film 31 within this range can ensure that the film is relatively light and thin while meeting certain strength requirements.

[0062] The mass block 32 can be glued to the surface of the film 31. Other methods can also be used to bond the mass block 32 to the film 31.

[0063] In some embodiments, in conjunction with reference Figure 3 and Figure 4The acoustic metamaterial unit 30 further includes: two fixing frames 33, which are respectively arranged on both sides of the film 31 and are used to fix the edges of the film 31 so that the film 31 is in a tensioned state. The edges of the film 31 are fixed and tensioned by the two fixing frames 33, so that the film 31 can better exert its elastic material properties. When sound waves act on the film 31, it can more effectively generate resonance and dissipate the energy of the sound waves; it can also effectively prevent the film 31 from loosening or deforming during use, thereby enhancing the stability and durability of the overall structure of the acoustic metamaterial unit 30.

[0064] refer to Figure 4 The shape of the fixed frame 33 includes a circular ring, and the inner radius of the two fixed frames 33 located on both sides of the same film 31 is equal, and the outer radius is also equal, which can improve the efficiency of preparing the fixed frame 33.

[0065] In some embodiments, the material density ρ of the fixing frame 33 is 1180 kg / m 3 ~1195kg / m 3 , for example 1180kg / m 3 、1185kg / m 3 、1190kg / m 3 or 1195kg / m 3 The elastic modulus E of the fixed frame 33 is 2.0 GPa to 2.5 GPa, such as 2.0 GPa, 2.2 GPa, 2.3 GPa or 2.5 GPa. The Poisson's ratio v is 0.365 to 0.385, such as 0.365, 0.375 or 0.385. In this way, the fixed frame 33 can ensure that it is relatively light and thin while meeting certain strength requirements, and is easy to use in various occasions.

[0066] For example, the material of the fixing frame 33 may be an ABS resin material including butadiene, styrene, and acrylonitrile. In other embodiments, the material of the fixing frame 33 may also include other materials that are relatively light and thin but have high strength.

[0067] In some embodiments, the acoustic metamaterial structure 10 includes at least two acoustic metamaterial units 30, and the fixing frame 33 between the films 31 of two adjacent acoustic metamaterial units 30 is one, which can be referred to as Figure 4 This not only reduces the amount of material used in the fixing frame 33 and reduces the manufacturing cost, but also helps to enhance the stability of the connection between two adjacent acoustic metamaterial units 30, prevents relative displacement or deformation between two adjacent acoustic metamaterial units 30, and thus improves the durability and reliability of the overall structure. In addition, the volume of the acoustic metamaterial structure 10 is also reduced, which is conducive to integrating the acoustic metamaterial structure 10 into various applications.

[0068] In some embodiments, in conjunction with reference Figure 2 and Figure 3 The acoustic metamaterial structure 10 includes at least two acoustic metamaterial units 30; the at least two acoustic metamaterial units 30 are stacked in sequence on one side of the cavity structure D. By arranging at least two acoustic metamaterial units 30 in the acoustic metamaterial structure 10, the structural parameters of the at least two acoustic metamaterial units 30 can be set to be different, so that the acoustic metamaterial structure 10 has different sound insulation effects, and the sound absorption effect and sound insulation effect between the at least two acoustic metamaterial units 30 can complement each other. For example, by designing at least two acoustic metamaterial units 30 with different acoustic characteristics, effective sound wave control can be achieved in a wider frequency range, which can not only improve the overall sound absorption effect and sound insulation effect of the sealing strip 100, but also ensure the reliability of the sound absorption effect and sound insulation effect of the sealing strip 100 during long-term use.

[0069] Exemplary, with reference to Figure 2 and Figure 3 , the acoustic metamaterial structure 10 includes two acoustic metamaterial units 30, and the two acoustic metamaterial units 30 are stacked in sequence on one side of the cavity structure D. In other embodiments, the number of acoustic metamaterial units 30 in the acoustic metamaterial structure 10 can also be 3, 4, 5 or other integers greater than 2. The specific number can be designed according to the size of the space of the accommodating cavity Q in the sealing portion M.

[0070] In some embodiments, when the acoustic metamaterial structure includes at least two acoustic metamaterial units, the tension of the films of at least two of the acoustic metamaterial units is equal. The tension of the films of at least two of the acoustic metamaterial units is equal, so that at least two films have consistent responses to sound waves of the same frequency, and the vibration mode and amplitude at the same frequency are more matched, which helps to maintain uniform acoustic performance throughout the acoustic metamaterial structure and helps to enhance the overall sound insulation effect of the acoustic metamaterial structure. And because the tension of the film may change due to environmental factors such as temperature and humidity, if the tension of the two films is equal, then the degree to which they are affected by environmental factors may also be closer, which helps to maintain the stability of the entire acoustic metamaterial structure.

[0071] In some embodiments, in one acoustic metamaterial unit 30, the number of the mass block 32 is one, which is disposed at the center of the film 31. Such a mass block 32 can serve as a clear vibration node, so that the acoustic metamaterial unit 30 resonates at a specific frequency, and this resonance helps to improve the acoustic performance of the acoustic metamaterial unit 30 within the target frequency range, thereby improving the sound absorption or sound insulation effect.

[0072] In some embodiments, in conjunction with reference Figure 3 and Figure 4, at least two acoustic metamaterial units 30 include a first acoustic metamaterial unit 301 and a second acoustic metamaterial unit 302; the first acoustic metamaterial unit 301 includes a first film 311, on which a first mass block 321 is disposed; the second acoustic metamaterial unit 302 includes a second film 312, on which a second mass block 322 is disposed; the tension of the first film 311 and the tension of the second film 312 are equal, and the masses of the first mass block 321 and the second mass block 322 are unequal. Under the condition that the tension of the first film 311 and the tension of the second film 312 are equal, by making the masses of the first mass block 321 and the second mass block 322 unequal, not only the sound wave manipulation effect is made more obvious and stable, but also the frequency control means is made more flexible. The masses of the first mass block 321 and the second mass block 322 are unequal, thereby making the first acoustic metamaterial unit 301 and the second acoustic metamaterial unit 302 have different resonance frequencies, thereby making the acoustic metamaterial structure 10 able to achieve effective sound wave control in a wide frequency range, and can optimize the acoustic performance of the acoustic metamaterial structure at different frequencies, and improve the sound absorption or sound insulation effect in a specific frequency range.

[0073] In some embodiments, the shape of the mass block 32 includes a cylindrical or a cubic shape. In this way, the contact area between the mass block 32 and the film 31 is relatively uniform, so that the stress distribution of the mass block 32 on the film 31 is uniform, avoiding local stress concentration; it is also beneficial to make it easier to position and fix the mass block 32 on the film 31, which helps to achieve accurate assembly and layout.

[0074] In some embodiments, reference Figure 1 , the sealing portion M includes a bottom wall M1; combined with reference Figure 3 and Figure 1 The resonance cavity D has a second opening K2 away from the acoustic metamaterial unit 30; the axis of the second opening K2 coincides with the axis of the first opening K1, and the bottom wall M1 blocks the second opening K2 of the resonance cavity D. This helps to form a closed acoustic environment in the resonance cavity D. In the closed resonance cavity D, it is more conducive for the sound waves to effectively interact with the acoustic metamaterial unit 30, so that the sound waves are transmitted between the resonance cavity D and the film 31 of the acoustic metamaterial unit 30, and the sound wave energy is gradually converted into mechanical vibration energy, thereby dissipating the sound wave energy and improving the sound absorption effect of the sealing strip M.

[0075] refer to Figure 4 , the height H of the cavity structure 20 can be 2.75 mm. It is understandable that the height H of the cavity structure 20 can also be other parameters, which can be specifically set according to the size of the accommodating cavity Q, as long as the bottom wall M1 can block the second opening K2 of the resonance cavity D.

[0076] In some embodiments, the sealing strip 100 includes a plurality of acoustic metamaterial structures 10 , and the plurality of acoustic metamaterial structures 10 are arranged in the accommodating cavity Q in at least one row or at least one column.

[0077] Exemplarily, multiple acoustic metamaterial structures 10 are arranged in multiple rows in the accommodating cavity Q. In this case, the structural parameters of the acoustic metamaterial units in the multiple acoustic metamaterial structures 10 can be set to be different, so that the sealing strip M has different sound insulation effects, and the sound absorption effect and sound insulation effect between the multiple acoustic metamaterial structures 10 can complement each other, which can improve the overall sound absorption effect and sound insulation effect of the sealing strip.

[0078] Exemplary, reference Figure 1 , multiple acoustic metamaterial structures 10 are arranged in a row in the accommodating cavity Q. In this way, when the sealing strip is arranged on the door frame of the car, no additional installation space is added, and the existing door structure space layout is not changed.

[0079] In this embodiment, the acoustic metamaterial structure 10 adopts a combination of a cavity structure 20 and an acoustic metamaterial unit 30, which can improve the peak and valley problems of the film 31 and the mass block 32 in low-frequency sound insulation, so that the sealing strip 100 can effectively absorb and consume low-frequency sound waves, thereby improving the low-frequency sound absorption performance of the sealing strip 100.

[0080] In some embodiments, the first acoustic metamaterial unit 301 has a first sound insulation peak frequency f 1 , the second acoustic metamaterial unit 302 has a second sound insulation peak frequency f 2 The sound insulation performance of the sealing strip is selected in the range of 100Hz-200Hz, and the number of sound insulation peaks is selected as 2. According to the principle of equal spacing, the frequency of the first sound insulation peak f 1 It can be 130Hz, the second sound insulation peak frequency f 2 It can be 160Hz.

[0081] In this case, you can refer to Figure 3 and Figure 4 The first acoustic metamaterial unit 301 includes a first film 311, on which a first mass block 321 is disposed, and the first mass block 321 is disposed at the center of the first film 311; the second acoustic metamaterial unit 302 includes a second film 312, on which a second mass block 322 is disposed, and the second mass block 322 is disposed at the center of the second film 312.

[0082] The shape of the first mass block 321 is cylindrical, and the mass m of the first mass block 321 is 1 is 0.0143 g. In this case, the radius r of the first mass block 321 is 1is 1.5 mm, the height is 0.75 mm, the radius a of the first film 311 1 is 6 mm (here, the radius of the first film 311 refers to the inner radius of the fixing frame 33 located on both sides of the first film 311). In order to make the first sound insulation peak frequency f 1 At 130 Hz, the tension T of the first film 311 1 It can be 0.9N / m.

[0083] The tension T of the first film 311 1 The calculation formula is: 1 =2πm 1 f 1 2 log(a 1 / r 1 ).

[0084] When the tension T of the second film 312 2 The tension T of the first film 311 1 In order to make the second sound insulation peak frequency f 2 At 160 Hz, at this time, the mass m of the second mass block 322 2 It is 0.0094g.

[0085] The mass m of the second mass block 322 2 The calculation formula is Among them, a 2 is the radius of the second film 312, r 2 is the radius of the second mass block 322. The radius of the second film 312 is equal to that of the first film 311, both of which are 6 mm. The radius of the second mass block 322 is equal to that of the first mass block 321, both of which are 1.5 mm.

[0086] Since the radius of the film 31 in the acoustic metamaterial unit 30 is determined by the inner radius of the fixed frame 33 and is difficult to adjust, and the radius of the mass block 32 has little effect on the sound insulation peak frequency, in this embodiment, the sound insulation peak of the acoustic metamaterial unit 30 is mainly adjusted by changing the tension of the film 31 in the acoustic metamaterial unit 30 and the mass of the mass block 32.

[0087] In other embodiments, the first sound insulation peak frequency f 1 and the second sound insulation peak frequency f 2 Other frequencies within the frequency range of 100Hz-200Hz can also be selected, such as 120Hz, 160Hz or 180Hz. The structure after the superposition of multiple metamaterials with different sound insulation peak frequencies will produce multiple sound insulation peaks, broadening the sound insulation frequency band, solving the problem that the original single metamaterial has a narrow sound insulation range and is difficult to apply.

[0088] When the number of the acoustic metamaterial units 30 in the acoustic metamaterial structure 10 is an integer greater than 2, such as 3, 4 or 5, the acoustic metamaterial structure 10 can have a plurality of different sound insulation peak frequencies, which will generate a plurality of sound insulation peaks, broaden the sound insulation frequency band, and solve the problem that the original single metamaterial has a narrow sound insulation range and is difficult to apply.

[0089] It should be noted that the sound insulation performance of the sealing strip can be set according to actual needs, and can be other frequency ranges below 500Hz, such as 300Hz to 400Hz, or other frequencies less than 100Hz. The adjustment of the sound insulation peak frequency can also be adjusted according to other parameters.

[0090] In some embodiments, the sealing portion M and the cavity structure 20 can both have a density ρ of 1000 kg / m 3 ~1120kg / m 3 The material of the sealing part M and the cavity structure 20 has a density, Young's modulus and Poisson's ratio within the range of 45MPa to 55MPa, and a Poisson's ratio v within the range of 0.48 to 0.50. The density, Young's modulus and Poisson's ratio of the sealing part M and the cavity structure 20 are within this range, so that the sealing part M and the cavity structure 20 have a higher Young's modulus and excellent mechanical properties, and when the sealing strip is hit, the stability of the accommodating cavity Q and the cavity structure 20 can be maintained. For example, when the sealing strip is applied to the door frame of an automobile, the sealing strip can better maintain the stability of the cavity structure 20 at the moment when the door is closed.

[0091] For example, the density ρ of the sealing portion M and the cavity structure 20 can be selected to be 1000 kg / m 3 , 1100kg / m 3 、1115kg / m 3 or 1120kg / m 3 ; Materials with Young's modulus E of 45 MPa, 50 MPa or 55 MPa and Poisson's ratio v of 0.45, 0.48 or 0.50.

[0092] Exemplarily, the materials of the sealing portion M and the cavity structure 20 both include polyurethane. Since polyurethane has a high Young's modulus and excellent mechanical properties, when the sealing strip is hit, the stability of the accommodating cavity Q and the cavity structure 20 can be maintained, and the sound absorption performance of the sealing strip 100 can be prevented from decreasing due to deformation of the accommodating cavity Q and the cavity structure 20, which not only improves the service life of the sealing strip 100, but also ensures its long-term stable noise suppression effect. In addition, the molecular chain activity of polyurethane materials is large, the molecular structure is highly designable, and the manufacturing process is simple, thereby reducing the production cost of the sealing strip 100 and improving the production efficiency of the sealing strip 100.

[0093] In some embodiments, the inner radius of the cavity structure 20 is equal to the inner radius of the fixed frame 33, which is beneficial for the transmission of sound waves between the resonance cavity and the film.

[0094] For example, when the inner radius of the fixing frame 33 is 6 mm, the inner radius of the cavity structure 20 is also 6 mm.

[0095] In the sealing strip 100 provided in this embodiment, the acoustic metamaterial structure 10 includes a cavity structure 20 and an acoustic metamaterial unit 30, wherein the acoustic metamaterial unit 30 is a new type of acoustic material or structure composed of specially designed artificial acoustic microstructure units periodically arranged in an elastic medium. The acoustic metamaterial unit 30 can achieve efficient sound insulation performance through its unique microstructure design. These materials can control the propagation and reflection of sound waves, effectively prevent sound waves from passing through a specific frequency range, thereby reducing the propagation of noise. Traditional sound insulation materials often have good sound insulation effects only within a specific frequency range, while the acoustic metamaterial unit 30 can achieve broadband sound insulation capabilities. That is, the acoustic metamaterial unit 30 can effectively isolate noise within a wider frequency range, improving the comprehensiveness and reliability of the sound insulation effect. This broadband sound insulation capability enables the acoustic metamaterial structure 10 to have better adaptability in complex noise environments. Therefore, the structure of the acoustic metamaterial structure 10 is simple and easy to make, and the size of the acoustic metamaterial structure 10 can also be designed according to actual needs to meet the application requirements of different scenarios. The acoustic metamaterial unit 30 uses lightweight materials and a thin design, which makes the acoustic metamaterial structure 10 more portable and easy to install in sound insulation and noise reduction applications. Compared with traditional sound insulation materials, the acoustic metamaterial structure 10 is lighter, easier to process and install, and can reduce preparation costs and improve preparation efficiency. When the acoustic metamaterial unit 30 is applied to a car door, it can effectively improve the sound insulation and noise reduction capabilities of the sealing strip and improve the comfort of opening and closing the car door.

[0096] In some embodiments, in conjunction with reference Figure 5 and Figure 6 The side wall of the cavity structure 20 is provided with a first through hole g1, and the side wall of the accommodating cavity Q is provided with a second through hole g2, and the axes of the first through hole g1 and the second through hole g2 coincide. By providing the first through hole g1 on the side wall of the cavity structure 20, the cavity structure 20 forms a Helmholtz resonance cavity, and on this basis, the parameters of the Helmholtz resonance cavity are adjusted, such as the size of the first through hole g1 or the volume of the Helmholtz resonance cavity, to obtain a specific resonance frequency to match the frequency of the sound wave to be absorbed, so that the noise reduction effect can be optimized, so that when the sound wave frequency is consistent with the natural frequency of the film and the Helmholtz resonance cavity, the acoustic metamaterial structure 10 will have a strong resonance phenomenon, so that the film and the Helmholtz resonance cavity will absorb and disperse a large amount of sound wave energy, thereby reducing the noise level.

[0097] In some embodiments, the radius of the first through hole g1 may be 0.6 mm. The radius of the first through hole g1 may be set according to the resonance frequency of the structure of the Helmholtz resonance cavity, without limitation.

[0098] In the case where the side wall of the cavity structure 20 is provided with a first through hole g1, the air mass M in the first through hole g1 is 0 S r L r ; The equivalent stiffness of the cavity structure 20 is:

[0099] Among them, ρ 0 Refers to the gas density inside the cavity structure 20, C 0 is the speed of sound waves in air, L r is the length of the first through hole g1 after correction, S r is the cross-sectional area of ​​the first through hole g1, V is the volume of the cavity structure 20, and L r The calculation process of L is as follows: r =L+δ+ε, where L is the actual length of the first through hole g1, δ is the internal correction length of the connection between the first through hole g1 and the cavity structure 20, and ε is the external correction length of the first through hole g1.

[0100] When the acoustic metamaterial structure 10 includes a plurality of acoustic metamaterial units 30, L r =L+1.7r 0 , where r 0 is the radius of the first through hole g1.

[0101] When the air in the first through hole g1 resonates, the formula K is satisfied. r -W 2 M=0, that is Where W = 2πf r , W is the angular frequency. Therefore, the calculation formula for the resonance frequency of the cavity structure 20 can be obtained as follows:

[0102] Therefore, the parameters of the first through hole g1 and the parameters of the cavity structure 20 can be set according to the above formula, so that the resonance frequency of the cavity structure 20 reaches the target frequency.

[0103] It should be noted that the sealing strip structure provided in this embodiment is illustrated by taking a P-type sealing strip as an example, and other sealing strips of similar shapes are also within the protection scope of the present invention. In addition, the specific parameters of the cavity structure 20 and the acoustic metamaterial structure 10 in the sealing strip structure are not limited to those described herein, and other types of sealing strips can adjust the structural parameters of the cavity structure 20 and the acoustic metamaterial structure 10 according to specific dimensions and noise reduction requirements.

[0104] An embodiment of the present disclosure further provides an automobile, comprising: a sealing strip as described in any of the above embodiments, wherein the sealing strip is arranged on a door frame of the automobile.

[0105] The sealing strip includes: a sealing part and an acoustic metamaterial structure; the sealing part forms a receiving cavity; since the acoustic metamaterial structure is arranged in the receiving cavity and has a compact structure, there is no need to add additional installation space, nor to change the spatial arrangement of the existing door structure. In addition, the acoustic metamaterial structure is not only light in structure, easy to process and install, but also can reduce the preparation cost and improve the preparation efficiency, and is also convenient for rapid replacement and upgrading in the existing door sealing system without making major changes to the door structure.

[0106] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A sealing strip (100), characterized in that: include: A sealing portion (M), wherein the sealing portion (M) forms a receiving cavity (Q); An acoustic metamaterial structure (10) is arranged in the accommodating cavity (Q); the acoustic metamaterial structure (10) comprises a cavity structure (20) and an acoustic metamaterial unit (30) arranged on one side of the cavity structure (20); The cavity structure (20) has a resonance cavity (D), and the resonance cavity (D) has a first opening (K1) close to the acoustic metamaterial unit (30); The acoustic metamaterial unit (30) comprises a film (31) and a mass block (32); the film (31) blocks the first opening (K1) of the resonance cavity (D); and the mass block (32) is arranged on a side of the film (31) away from the resonance cavity (D).

2. The sealing strip (100) according to claim 1, characterized in that: The acoustic metamaterial structure (10) comprises at least two acoustic metamaterial units (30); the at least two acoustic metamaterial units (30) are stacked in sequence on one side of the cavity structure (20).

3. The sealing strip (100) according to claim 2, characterized in that: The tensions of the films (31) of at least two of the acoustic metamaterial units (30) are equal.

4. The sealing strip (100) according to claim 2, characterized in that: In one of the acoustic metamaterial units (30), the number of the mass block (32) is one and is arranged at the center of the film (31).

5. The sealing strip (100) according to claim 4, characterized in that: The at least two acoustic metamaterial units (30) include a first acoustic metamaterial unit (301) and a second acoustic metamaterial unit (302); The first acoustic metamaterial unit (301) comprises a first film (311), on which a first mass block (321) is disposed; the second acoustic metamaterial unit (302) comprises a second film (312), on which a second mass block (322) is disposed; The tension of the first film (311) and the tension of the second film (312) are equal, and the masses of the first mass block (321) and the second mass block (322) are unequal.

6. The sealing strip (100) according to any one of claims 1 to 5, characterized in that: The shape of the mass block (32) includes a cylinder or a cube.

7. The sealing strip (100) according to any one of claims 1 to 5, characterized in that: The acoustic metamaterial unit (30) further comprises: two fixing frames (33) respectively arranged on two sides of the film (31) and used for fixing the edge of the film (31) so that the film (31) is in a tensioned state.

8. The sealing strip (100) according to claim 7, characterized in that: The acoustic metamaterial structure (10) comprises at least two acoustic metamaterial units (30), and there is one fixing frame (33) between the films (31) of two adjacent acoustic metamaterial units (30).

9. The sealing strip (100) according to any one of claims 1 to 5, characterized in that: A first through hole (g1) is provided on the side wall of the cavity structure (20), and a second through hole (g2) is provided on the side wall of the accommodating cavity (Q), and the axes of the first through hole (g1) and the second through hole (g2) coincide with each other.

10. The sealing strip (100) according to any one of claims 1 to 5, characterized in that: The sealing portion (M) comprises a bottom wall (M1); The resonance cavity (D) has a second opening (K2) far away from the acoustic metamaterial unit (30), and the bottom wall (M1) blocks the second opening (K2) of the resonance cavity (D).

11. The sealing strip (100) according to any one of claims 1 to 5, characterized in that: The number of the acoustic metamaterial structures (10) is multiple, and the multiple acoustic metamaterial structures (10) are arranged in at least one row or at least one column in the accommodating cavity (Q).

12. The sealing strip (100) according to any one of claims 1 to 5, characterized in that: The sealing portion (M) and the cavity structure (20) are both made of polyurethane.

13. A car, characterized in that: include: The sealing strip according to any one of claims 1 to 12 is arranged on a door frame of an automobile.

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