Sealing strips and automobiles

Abstract

This invention relates to a sealing strip and an automobile. The sealing strip includes a sealing portion and an acoustic metamaterial structure. The sealing portion forms a receiving cavity. The acoustic metamaterial structure is disposed within the receiving cavity. The acoustic metamaterial structure includes a cavity structure and an acoustic metamaterial unit disposed on one side of the cavity structure. The cavity structure has a resonant cavity with a first opening near the acoustic metamaterial unit. The acoustic metamaterial unit includes a thin film and a mass block. The thin film seals the first opening of the resonant cavity, and the mass block is disposed on the side of the thin film away from the resonant cavity. The sealing strip has high sound insulation and noise reduction capabilities.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, specifically to a sealing strip and an automobile. Background Technology

[0002] With the development of automotive technology, people have increasingly higher requirements for the performance of cars, paying more attention to comfort and quality. The sound of a door closing, as a direct indicator of a car's quality, has become a focus of attention across the industry. Research shows that door locks, weatherstripping, damping blocks, and interior panels all directly affect the quality of the door closing sound, with weatherstripping having a particularly significant impact. As a crucial component of the car body, door weatherstripping plays a key role in maintaining a quiet interior environment and providing necessary dust, water, and wind protection. Most existing weatherstripping designs are relatively simple, offering some improvement in door closing sound quality, but their sound insulation and noise reduction effects are poor. Summary of the Invention

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

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] According to a first aspect of this application, a sealing strip is provided, comprising: a sealing portion and an acoustic metamaterial structure; the sealing portion forming a receiving cavity; the acoustic metamaterial structure disposed within the receiving cavity; the acoustic metamaterial structure comprising a cavity structure and an acoustic metamaterial unit disposed on one side of the cavity structure; wherein the cavity structure has a resonant cavity, the resonant cavity having a first opening near the acoustic metamaterial unit; the acoustic metamaterial unit comprising a thin film and a mass block, the thin film sealing the first opening of the resonant cavity, and the mass block disposed on the side of the thin film away from the resonant cavity.

[0006] According to the aforementioned technical means, since the mass block is located on the side of the thin film away from the resonant cavity, the mass block can change the original amplitude of the thin film, causing the sound wave to resonate with the thin film and increasing the amplitude of the thin film. This converts the sound wave energy into the mechanical vibration energy of the thin film, thereby consuming a large amount of sound wave energy and improving the sound absorption and noise reduction performance of the acoustic metamaterial structure. Furthermore, the thin film seals the first opening of the resonant cavity in the cavity structure. When sound waves are incident on the acoustic metamaterial structure, they are transmitted between the resonant cavity and the thin film. The sound waves not only cause the thin film to vibrate but also the air in the resonant cavity to vibrate. When the vibration frequency of the air in the resonant cavity matches the vibration frequency of the resonant cavity, the air in the resonant cavity resonates with the resonant cavity. The vibration of the resonant cavity interacts with the vibration of the thin film, thus achieving coupling and changing the natural frequency of the acoustic metamaterial structure. This allows the sound wave energy to be distributed between the vibration of the thin film and the resonant cavity, thereby consuming a large amount of sound wave energy and enabling the sealing strip to achieve the effect of sound insulation and noise reduction.

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

[0008] Based on the aforementioned technical means, the sealing strip provided in this application, by setting at least two acoustic metamaterial units in the acoustic metamaterial structure, can have different structural parameters, thus giving the acoustic metamaterial structure different sound insulation effects. The sound absorption and sound insulation effects between the at least two acoustic metamaterial units can complement each other, which not only improves the overall sound absorption and sound insulation effects of the sealing strip, but also ensures the reliability of the sound absorption and sound insulation effects of the sealing strip during long-term use.

[0009] In one possible implementation, the thin films of at least two of the acoustic metamaterial units have equal tension.

[0010] Based on the aforementioned technical means, the sealing strip provided in this application ensures that the tension of the films of at least two of the acoustic metamaterial units is equal. This means that at least two films respond consistently to sound waves of the same frequency, and their vibration modes and amplitudes at the same frequency are more matched. This helps maintain uniform acoustic performance throughout the entire acoustic metamaterial structure and enhances the overall sound insulation effect. Furthermore, since the tension of the films may change due to environmental factors such as temperature and humidity, equal tension in two films means that their susceptibility to environmental factors is likely to be more similar, contributing to the stability of the entire acoustic metamaterial structure.

[0011] In one possible implementation, one of the acoustic metamaterial units comprises one mass block located at the center of the thin film.

[0012] According to the above-mentioned technical means, the sealing strip provided in this application has a mass block set in the center of the film in an acoustic metamaterial unit. Such a mass block can serve as a specific vibration node, so that the acoustic metamaterial unit can resonate at a specific frequency. This resonance helps to improve the acoustic performance of the acoustic metamaterial unit in the target frequency range, thereby improving the sound absorption or sound insulation effect.

[0013] In one 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 thin film with a first mass block disposed thereon; the second acoustic metamaterial unit includes a second thin film with a second mass block disposed thereon; the tension of the first thin film and the tension of the second thin film are equal, and the masses of the first mass block and the second mass block are unequal.

[0014] According to the above-mentioned technical means, the sealing strip provided in this 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. Moreover, the unequal masses of the first mass block and the second mass block make the first acoustic metamaterial unit and the second acoustic metamaterial unit have different resonant frequencies, thereby enabling the acoustic metamaterial structure to achieve effective sound wave control over a wide frequency range. It 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 one possible implementation, the mass block may be cylindrical or cubic in shape.

[0016] Based on the above-mentioned technical means, the sealing strip provided in this application has a mass block in the shape of a cylinder or a cube, which can make the stress distribution of the mass block on the film uniform and avoid local stress concentration; it also makes it easier to position and fix the mass block on the film, which helps to achieve precise assembly and layout.

[0017] In one possible implementation, the acoustic metamaterial unit further includes two fixing frames, respectively disposed on both sides of the film, for fixing the edges of the film and keeping the film in a tensioned state.

[0018] Based on the above-mentioned technical means, the sealing strip provided in this application fixes and tensions the edge of the film through two fixed frames. This allows the film to better exert the properties of its elastic material. 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, and enhance the stability and durability of the overall structure of the acoustic metamaterial unit.

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

[0020] Based on the aforementioned technical means, the sealing strip provided in this application comprises an acoustic metamaterial structure including at least two acoustic metamaterial units. 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 lowers manufacturing costs, but also helps to enhance the stability of the connection between two adjacent acoustic metamaterial units, preventing relative displacement or deformation between the two adjacent acoustic metamaterial units, thereby improving the durability and reliability of the overall structure. In addition, it also reduces the volume of the acoustic metamaterial structure, which is beneficial for integrating the acoustic metamaterial structure into various applications.

[0021] In one possible implementation, the sidewall of the cavity structure is provided with a first through hole, and the sidewall of the receiving cavity is provided with a second through hole, wherein the axes of the first through hole and the second through hole coincide.

[0022] According to the above-mentioned technical means, the sealing strip provided in this application forms a Helmholtz resonant cavity by providing a first through hole on the side wall of the cavity structure. Based on this, by adjusting the parameters of the Helmholtz resonant cavity, such as the size of the first through hole or the volume of the Helmholtz resonant cavity, a specific resonant frequency can be obtained to match the sound wave frequency that needs to be absorbed. This can optimize the noise reduction effect, so that when the sound wave frequency is consistent with the resonant frequency of the thin film and the Helmholtz resonant cavity, the acoustic metamaterial structure will undergo a strong resonance phenomenon. In this way, the thin film and the Helmholtz resonant cavity will absorb and disperse a large amount of sound wave energy, thereby reducing the noise level.

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

[0024] According to the above-mentioned technical means, the sealing strip provided in this application uses the bottom wall of the sealing part to block the second opening of the resonant cavity. This helps to form a closed acoustic environment in the resonant cavity. In the closed resonant cavity, it is more conducive to the effective interaction between the sound waves and the acoustic metamaterial unit, so that the sound waves are transmitted between the resonant cavity and the thin film of the acoustic metamaterial unit, gradually converting the sound wave energy into mechanical vibration energy, thereby dissipating the sound wave energy and improving the sound absorption effect of the sealing strip.

[0025] In one possible implementation, the number of acoustic metamaterial structures is multiple, and the multiple acoustic metamaterial structures are arranged in at least one row or at least one column in the receiving cavity.

[0026] Based on the above-mentioned technical means, the sealing strip provided in this application has multiple acoustic metamaterial structures. In this way, the sound absorption and sound insulation effects of multiple acoustic metamaterial structures can complement each other, which is conducive to improving the overall sound absorption and sound insulation effects of the sealing strip, meeting the needs of different application scenarios. Multiple acoustic metamaterial structures can also ensure the reliability of the sound absorption and sound insulation effects of the sealing strip during long-term use.

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

[0028] Based on the aforementioned technical means, the sealing part and cavity structure of the sealing strip provided in this application are both made of polyurethane. Due to the high Young's modulus and excellent mechanical properties of polyurethane, it can maintain the stability of the cavity and cavity structure when the sealing strip is subjected to impact, thus avoiding the decrease in the sound absorption performance of the sealing strip due to deformation of the cavity and cavity structure. This not only improves the service life of the sealing strip but also ensures its long-term stable noise suppression effect. In addition, polyurethane materials have high molecular chain activity, strong molecular structure designability, and simple manufacturing process, 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 this application, an automobile is provided, comprising: the sealing strip described in any of the above embodiments, disposed on the automobile door frame.

[0030] The beneficial effects of this invention are:

[0031] (1) The sealing strip of this application converts sound wave energy into mechanical vibration energy between the thin film and the resonant 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 this application has good reliability in sound absorption and sound insulation during long-term use.

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

[0034] (4) The sealing strip of this application is beneficial to improving the acoustic performance of the acoustic metamaterial unit in the target frequency range, thereby improving the sound absorption or sound insulation effect of the sealing strip.

[0035] (5) The sealing strip of this application can achieve effective sound wave control over a wide frequency range, 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 in a specific frequency range.

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

[0037] (7) The sealing strip of this 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 cavity and cavity structure when it is subjected to collision.

[0038] It should be noted that the technical effects of the second aspect of this application can be found in the technical effects of the corresponding implementation in the first aspect, and will not be repeated here.

[0039] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

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

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

[0042] Figure 3 The diagram shown is a cross-sectional view of an acoustic metamaterial structure as an exemplary embodiment.

[0043] Figure 4 The diagram shown is an exploded view of an acoustic metamaterial structure as an exemplary embodiment.

[0044] Figure 5 The diagram shown is a structural diagram of another sealing strip as illustrated in an exemplary embodiment;

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

[0046] In the diagram, 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-fixed frame, g1-first through hole, g2-second through hole. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0048] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0049] In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0052] In the embodiments of this 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 this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

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

[0054] When a car door is closed, the contact between the door and the car body often generates significant noise, affecting passenger comfort. Door sealing strips primarily function to seal, waterproof, prevent dust, and reduce vibration and sound. Some embodiments of automotive sealing strips are not only structurally complex, requiring high-quality manufacturing, but also large in size, limiting installation and making them unsuitable for certain applications. Furthermore, some sealing strips, due to their simple materials and structure, are ineffective at suppressing low-frequency noise, especially noise below 500Hz, and struggle to effectively absorb the low-frequency sound waves generated when the door closes.

[0055] To solve the above technical problems, refer to Figure 1 This disclosure provides a sealing strip 100, including 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 within the receiving cavity Q. (Referring to the reference...) Figure 2 and Figure 3 The acoustic metamaterial structure 10 includes a cavity structure 20 and an acoustic metamaterial unit 30 disposed on one side of the cavity structure 20; wherein, the cavity structure 20 has a resonant cavity D, and the resonant cavity D has a first opening K1 near the acoustic metamaterial unit 30; the acoustic metamaterial unit 30 includes a thin film 31 and a mass block 32, the thin film 31 blocks the first opening K1 of the resonant cavity D, and the mass block 32 is disposed on the side of the thin film 31 away from the resonant cavity D.

[0056] The sealing strip 100 provided in this embodiment has a mass block 32 located on the side of the diaphragm 31 away from the resonant cavity D. In this way, the mass block 32 can change the original amplitude of the diaphragm 31, so that the sound wave resonates with the diaphragm 31 and increases the amplitude of the diaphragm 31. Thus, the sound wave energy is converted into the mechanical vibration energy of the diaphragm 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. Furthermore, the thin film 31 seals the first opening K1 of the resonant cavity D in the cavity structure 20. When sound waves are incident on the acoustic metamaterial structure 10, they will be transmitted between the resonant cavity D and the thin film 31. The sound waves not only cause the thin film 31 to vibrate, but also cause the air in the resonant cavity D to vibrate. When the vibration frequency of the air in the resonant cavity D matches the vibration frequency of the resonant cavity D, the air in the resonant cavity D resonates with the resonant cavity D. The vibration of the resonant cavity D interacts with the vibration of the thin film 31 to achieve coupling, changing the natural frequency of the acoustic metamaterial structure 10. This allows the energy of the sound waves to be distributed between the vibration of the thin film 31 and the resonant cavity D, thereby consuming a large amount of sound wave energy and enabling the sealing strip 100 to 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 size of the cavity Q in the sealing part M. This embodiment does not limit this.

[0058] In some embodiments, the density ρ of the mass block 32 is 2650 kg / m³. 3 ~2780kg / m 3 For example, 2650kg / m 3 2700kg / m 3 2750kg / m 3 Or 2780kg / m 3 The elastic modulus E of mass block 32 is 6.5 × 10⁻⁶. 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 mass block 32 is 0.32 to 0.35, for example 0.32, 0.33 or 0.35.

[0059] For example, the material of mass block 32 includes aluminum. In other embodiments, mass block 32 may also include other materials with a density ρ of 2650 kg / m³. 3 ~2780kg / m 3 Within the range, the elastic modulus E is 6.5 × 10⁻⁶. 10 Pa ~ 7.5 × 10 10 Other materials within the Pa range, and those with a Poisson's ratio v in the range of 0.32 to 0.35.

[0060] In some embodiments, the material of film 31 includes polyethylene. In other embodiments, the material of 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, for example, 0.70 mm, 0.72 mm, 0.75 mm, or 0.80 mm. The thickness of the film 31 is within this range, ensuring a relatively thin and lightweight design while still meeting certain strength requirements.

[0062] The mass block 32 can be glued to the surface of the film 31. Alternatively, other methods can 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 also includes two fixing frames 33, respectively disposed on both sides of the thin film 31, for fixing the edges of the thin film 31 and keeping the thin film 31 in a tensioned state. By fixing and tensioning the edges of the thin film 31 with the two fixing frames 33, the thin film 31 can better exert the properties of its elastic material. When sound waves act on the thin film 31, it can more effectively generate resonance and dissipate the energy of the sound waves; it can also effectively prevent the thin film 31 from loosening or deforming during use, enhancing the overall stability and durability of the acoustic metamaterial unit 30.

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

[0065] In some embodiments, the material density ρ of the fixed frame 33 is 1180 kg / m³. 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, for example, 2.0 GPa, 2.2 GPa, 2.3 GPa, or 2.5 GPa. The Poisson's ratio v is 0.365 to 0.385, for example, 0.365, 0.375, or 0.385. This ensures that the fixed frame 33 is relatively lightweight and thin while meeting certain strength requirements, making it suitable for use in various applications.

[0066] For example, the material of the fixing frame 33 may be ABS resin material including butadiene, styrene, and acrylonitrile. In other embodiments, the material of the fixing frame 33 may also include other lightweight and high-strength materials.

[0067] In some embodiments, the acoustic metamaterial structure 10 includes at least two acoustic metamaterial units 30, and the fixing frame 33 between the thin films 31 of two adjacent acoustic metamaterial units 30 is one, which can be referred to Figure 4 This not only reduces the amount of material used in the fixed frame 33, lowering manufacturing costs, but also helps enhance the stability of the connection between two adjacent acoustic metamaterial units 30, preventing relative displacement or deformation between them, thereby improving the overall structure's durability and reliability. Furthermore, it reduces the volume of the acoustic metamaterial structure 10, facilitating its integration 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 sequentially on one side of the cavity structure D. By setting 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. The sound absorption and sound insulation effects 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 properties, effective sound wave control can be achieved in a wider frequency range. This not only improves the overall sound absorption and sound insulation effect of the sealing strip 100, but also ensures the reliability of the sound absorption and sound insulation effect of the sealing strip 100 during long-term use.

[0069] For example, in conjunction with reference Figure 2 and Figure 3 The acoustic metamaterial structure 10 includes two acoustic metamaterial units 30, which are stacked sequentially 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 be 3, 4, 5, or other integers greater than 2. The specific number can be designed according to the size of the cavity Q in the sealing part M.

[0070] In some embodiments, when the acoustic metamaterial structure comprises at least two acoustic metamaterial units, the tension of the films of at least two of the acoustic metamaterial units is equal. Equal tension of the films of at least two of the acoustic metamaterial units ensures that at least two films respond consistently to sound waves of the same frequency, and their vibration modes and amplitudes at the same frequency are more matched. This helps maintain uniform acoustic performance throughout the acoustic metamaterial structure and enhances its overall sound insulation effect. Furthermore, since the tension of the films may change due to environmental factors such as temperature and humidity, equal tension in two films means that their susceptibility to environmental factors is likely to be more similar, contributing to the stability of the entire acoustic metamaterial structure.

[0071] In some embodiments, an acoustic metamaterial unit 30 has one mass block 32 located at the center of the thin film 31. Such a mass block 32 can serve as a defined vibration node, causing the acoustic metamaterial unit 30 to resonate at a specific frequency. This resonance helps to improve the acoustic performance of the acoustic metamaterial unit 30 within a target frequency range, thereby improving the sound absorption or sound insulation effect.

[0072] In some embodiments, in conjunction with reference Figure 3 and Figure 4At 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 thin film 311, on which a first mass block 321 is disposed; the second acoustic metamaterial unit 302 includes a second thin film 312, on which a second mass block 322 is disposed; the tension of the first thin film 311 and the tension of the second thin film 312 are equal, and the masses of the first mass block 321 and the second mass block 322 are not equal. 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 is the sound wave manipulation effect more obvious and stable, but the frequency control means are also more flexible. Moreover, the unequal masses of the first mass block 321 and the second mass block 322 enable the first acoustic metamaterial unit 301 and the second acoustic metamaterial unit 302 to have different resonant frequencies, thereby enabling the acoustic metamaterial structure 10 to achieve effective sound wave control over a wide frequency range. This 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.

[0073] In some embodiments, the mass block 32 is cylindrical or cubic in shape. This results in a more uniform contact area between the mass block 32 and the film 31, which can make the stress distribution of the mass block 32 on the film 31 more uniform and avoid local stress concentration; it also makes it easier to position and fix the mass block 32 on the film 31, which helps to achieve precise assembly and layout.

[0074] In some embodiments, reference Figure 1 The sealing part M includes a bottom wall M1; referring to the reference Figure 3 and Figure 1 The resonant cavity D has a second opening K2 located away from the acoustic metamaterial unit 30. The axis of the second opening K2 coincides with that of the first opening K1, and the bottom wall M1 seals the second opening K2 of the resonant cavity D. This helps to create a closed acoustic environment in the resonant cavity D. Within the closed resonant cavity D, it is more conducive to the effective interaction of sound waves with the acoustic metamaterial unit 30, allowing sound waves to be transmitted between the resonant cavity D and the thin film 31 of the acoustic metamaterial unit 30, gradually converting sound wave energy into mechanical vibration energy, thereby dissipating 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 set according to the size of the cavity Q, as long as the bottom wall M1 can block the second opening K2 of the resonant cavity D.

[0076] In some embodiments, the number of acoustic metamaterial structures 10 in the sealing strip 100 is multiple, and the multiple acoustic metamaterial structures 10 are arranged in at least one row or at least one column in the receiving cavity Q.

[0077] For example, multiple acoustic metamaterial structures 10 are arranged in multiple rows in the receiving 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. The sound absorption and sound insulation effects of the multiple acoustic metamaterial structures 10 can complement each other, which can improve the overall sound absorption and sound insulation effects of the sealing strip.

[0078] For example, refer to Figure 1 Multiple acoustic metamaterial structures 10 are arranged in a row within the receiving cavity Q. This ensures that when the sealing strip is installed on the car door frame, no additional installation space is required, nor is the existing door structure spatial arrangement altered.

[0079] In this embodiment, the acoustic metamaterial structure 10 adopts a combination of cavity structure 20 and acoustic metamaterial unit 30, which can improve the peak and valley problems generated by the thin film 31 and mass block 32 in low-frequency sound insulation, so that the sealing strip 100 can effectively absorb and consume low-frequency sound waves and improve 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 f1, and the second acoustic metamaterial unit 302 has a second sound insulation peak frequency f2. 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 first sound insulation peak frequency f1 can be 130Hz, and the second sound insulation peak frequency f2 can be 160Hz.

[0081] In this case, references can be consulted. Figure 3 and Figure 4 The first acoustic metamaterial unit 301 includes a first thin 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 thin film 311; the second acoustic metamaterial unit 302 includes a second thin 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 thin film 312.

[0082] The first mass block 321 is cylindrical in shape, and its mass m1 is 0.0143g. In this case, the radius r1 of the first mass block 321 is 1.5mm, and its height is 0.75mm. The radius a1 of the first film 311 is 6mm (here, the radius of the first film 311 refers to the inner radius of the fixed frame 33 located on both sides of the first film 311). In order to make the first sound insulation peak frequency f1 at 130Hz, the tension T1 of the first film 311 can be 0.9N / m.

[0083] The formula for calculating the tension T1 of the first thin film 311 is: T1=2πm1f1 2 log(a1 / r1).

[0084] When the tension T2 of the second film 312 is equal to the tension T1 of the first film 311, in order to make the second sound insulation peak frequency f2 at 160Hz, the mass m2 of the second mass block 322 is 0.0094g.

[0085] The formula for calculating the mass m2 of the second mass block 322 is as follows: Where a2 is the radius of the second film 312 and r2 is the radius of the second mass block 322. The radius of the second film 312 is equal to the radius of the first film 311, both being 6 mm, and the radius of the second mass block 322 is equal to the radius of the first mass block 321, both being 1.5 mm.

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

[0087] In other embodiments, the first sound insulation peak frequency f1 and the second sound insulation peak frequency f2 can also be selected from other frequencies within the range of 100Hz-200Hz, such as 120Hz, 160Hz, or 180Hz. The structure resulting from the superposition of multiple metamaterials with different sound insulation peak frequencies generates multiple sound insulation peaks, broadening the sound insulation bandwidth and solving the problem that the original single metamaterial had a narrow sound insulation range and was difficult to apply.

[0088] When the number of 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 multiple different sound insulation peak frequencies. This will generate multiple sound insulation peaks, broaden the sound insulation frequency band, and solve the problem that the original single metamaterial had a narrow sound insulation range and was difficult to apply.

[0089] It should be noted that the sound insulation performance of the sealing strip can be set according to actual needs. It can be any frequency range below 500Hz, such as 300Hz to 400Hz, or any frequency below 100Hz. Furthermore, the peak sound insulation frequency can also be adjusted according to other parameters.

[0090] In some embodiments, both the sealing part M and the cavity structure 20 can be made of materials with a density ρ of 1000 kg / m³. 3 ~1120kg / m 3 The material has an elastic modulus E in the range of 45 MPa to 55 MPa and a Poisson's ratio v in the range of 0.48 to 0.50. When the density, Young's modulus, and Poisson's ratio of the materials for the sealing part M and the cavity structure 20 are within this range, the sealing part M and the cavity structure 20 can possess a high Young's modulus and excellent mechanical properties, maintaining the stability of the accommodating cavity Q and the cavity structure 20 even when the sealing strip is subjected to impact. For example, when the sealing strip is applied to an automotive door frame, it can better maintain the stability of the cavity structure 20 at the moment the door closes.

[0091] For example, the sealing part M and the cavity structure 20 can be selected with a density ρ of 1000 kg / m³. 3 1100kg / m 3 1115kg / m 3 Or 1120kg / m 3 Materials with a Young's modulus E of 45 MPa, 50 MPa, or 55 MPa and a Poisson's ratio v of 0.45, 0.48, or 0.50.

[0092] For example, both the sealing part M and the cavity structure 20 are made of polyurethane. Because polyurethane has a high Young's modulus and excellent mechanical properties, it can maintain the stability of the receiving cavity Q and the cavity structure 20 when the sealing strip is subjected to impact. This prevents the sound absorption performance of the sealing strip 100 from decreasing due to deformation of the receiving cavity Q and the cavity structure 20, thus not only improving the service life of the sealing strip 100 but also ensuring its long-term stable noise suppression effect. Furthermore, polyurethane materials have high molecular chain activity, strong molecular structure designability, and simple manufacturing processes, thereby reducing the production cost of the sealing strip 100 and improving its production efficiency.

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

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

[0095] In this embodiment, the sealing strip 100 includes an acoustic metamaterial structure 10 comprising a cavity structure 20 and acoustic metamaterial units 30. The acoustic metamaterial unit 30 is a novel acoustic material or structure composed of specially designed artificial acoustic microstructure units periodically arranged in an elastic medium. Through its unique microstructure design, the acoustic metamaterial unit 30 achieves highly efficient sound insulation performance. These materials can control the propagation and reflection of sound waves, effectively preventing sound waves from passing through specific frequency ranges, thereby reducing noise propagation. Traditional sound insulation materials often only have good sound insulation effects 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 over a wider frequency range, improving the comprehensiveness and reliability of the sound insulation effect. This broadband sound insulation capability makes the acoustic metamaterial structure 10 more adaptable to complex noise environments. Therefore, the acoustic metamaterial structure 10 has a simple structure and is easy to manufacture. 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 utilizes lightweight materials and a thin design, making the acoustic metamaterial structure 10 more portable and easier to install in sound insulation and noise reduction applications. Compared to traditional sound insulation materials, the acoustic metamaterial structure 10 is lighter, easier to process and install, reducing manufacturing costs and improving manufacturing efficiency. When applied to car doors, the acoustic metamaterial unit 30 can effectively improve the sound insulation and noise reduction capabilities of the sealing strip, enhancing the comfort of opening and closing car doors.

[0096] In some embodiments, in conjunction with reference Figure 5 and Figure 6 The cavity structure 20 has a first through hole g1 on its sidewall and a second through hole g2 on its sidewall accommodating the cavity Q. The axes of the first through hole g1 and the second through hole g2 coincide. By providing the first through hole g1 on the sidewall of the cavity structure 20, the cavity structure 20 forms a Helmholtz resonant cavity. Based on this, by adjusting the parameters of the Helmholtz resonant cavity, such as the size of the first through hole g1 or the volume of the Helmholtz resonant cavity, a specific resonant frequency can be obtained to match the sound wave frequency that needs to be absorbed. This can optimize the noise reduction effect, so that when the sound wave frequency is consistent with the natural frequency of the thin film and the Helmholtz resonant cavity, the acoustic metamaterial structure 10 will undergo a strong resonance phenomenon. In this way, the thin film and the Helmholtz resonant 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 can be 0.6 mm. The radius of the first through hole g1 can be set according to the resonant frequency of the Helmholtz resonant cavity structure and is not limited.

[0098] When a first through hole g1 is provided on the side wall of the cavity structure 20, the air mass M in the first through hole g1 is M = ρ0Sr L r The equivalent stiffness of cavity structure 20 is:

[0099] Where ρ0 refers to the gas density inside cavity structure 20, C0 is the speed of sound in air, and L r S is the corrected length of the first through hole g1. r V is the cross-sectional area of ​​the first through hole g1, and L is the volume of the cavity structure 20. r The calculation process is as follows: L r =L+δ+ε, where L is the actual length of the first through hole g1, δ is the internal correction length at 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 multiple acoustic metamaterial units 30, then L r =L+1.7r0, where r0 is the radius of the first through hole g1.

[0101] When air resonance occurs within the first through-hole g1, the formula K is satisfied. r -W 2 M=0, which means Where W = 2πf r W is the angular frequency. Therefore, the formula for calculating the resonant frequency of the cavity structure 20 is:

[0102] Therefore, the parameters of the first through hole g1 and 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 using a P-type sealing strip as an example. Other sealing strips with similar shapes are also within the scope of protection of this invention. Furthermore, 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. Other types of sealing strips can have their structural parameters of the cavity structure 20 and the acoustic metamaterial structure 10 adjusted according to specific dimensions and noise reduction requirements.

[0104] Embodiments of this disclosure also provide an automobile, including: a sealing strip as described in any of the above embodiments, the sealing strip being disposed on the automobile door frame.

[0105] The sealing strip comprises a sealing portion and an acoustic metamaterial structure. The sealing portion forms a receiving cavity. Because the acoustic metamaterial structure is housed within the receiving cavity, its compact structure eliminates the need for additional installation space or alterations to the existing door structure's spatial arrangement. Furthermore, the acoustic metamaterial structure is not only lightweight, easy to process and install, but also reduces manufacturing costs and improves manufacturing efficiency. It also facilitates rapid replacement and upgrades within existing door sealing systems without requiring significant modifications to the door structure.

[0106] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A sealing strip (100), characterized in that, include: A sealing portion (M) forms a receiving cavity (Q); An acoustic metamaterial structure (10) is disposed within the cavity (Q); the acoustic metamaterial structure (10) includes a cavity structure (20) and an acoustic metamaterial unit (30) disposed on one side of the cavity structure (20); The cavity structure (20) has a resonant cavity (D), which has a first opening (K1) near the acoustic metamaterial unit (30); The acoustic metamaterial unit (30) includes a thin film (31) and a mass block (32). The thin film (31) blocks the first opening (K1) of the resonant cavity (D), and the mass block (32) is located on the side of the thin film (31) away from the resonant cavity (D).

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

3. The sealing strip (100) according to claim 2, characterized in that, The tension of the thin film (31) of at least two of the acoustic metamaterial units (30) is equal.

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

5. The sealing strip (100) according to claim 4, characterized in that, At least two of the 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 thin film (311) on which a first mass block (321) is disposed; the second acoustic metamaterial unit (302) includes a second thin film (312) on which a second mass block (322) is disposed. The tension of the first film (311) is equal to the tension of the second film (312), and the masses of the first mass block (321) and the second mass block (322) are not equal.

6. The sealing strip (100) according to any one of claims 1 to 5, characterized in that, The mass block (32) may be cylindrical or cubic in shape.

7. The sealing strip (100) according to any one of claims 1 to 5, characterized in that, The acoustic metamaterial unit (30) further includes two fixing frames (33), which are respectively disposed on both sides of the film (31) to fix 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) includes at least two acoustic metamaterial units (30), and the fixing frame (33) between the thin films (31) of two adjacent acoustic metamaterial units (30) is one.

9. The sealing strip (100) according to any one of claims 1 to 5, characterized in that, The cavity structure (20) has a first through hole (g1) on its side wall and the receiving cavity (Q) has a second through hole (g2) on its side wall. The axes of the first through hole (g1) and the second through hole (g2) coincide.

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

11. The sealing strip (100) according to any one of claims 1 to 5, characterized in that, The number of 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 receiving cavity (Q).

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

13. A car, characterized in that, include: The sealing strip as described in any one of claims 1 to 12 is provided on the car door frame.

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