An acoustic metamaterial device and a hair dryer

Abstract

This utility model discloses an acoustic metamaterial device and a blower. The key technical features include a resonant cavity body, an internal cavity, and a through hole communicating with the cavity on the surface of the resonant cavity body. A diaphragm is fitted onto the surface of the resonant cavity body, covering the through hole. The diaphragm vibrates under the excitation of airflow and / or sound waves, thereby inducing air resonance in the cavity through the through hole. This utility model utilizes the principle of cavity diaphragm resonance to excite the diaphragm at the cavity opening within a limited space under the coupling of high-speed airflow and external sound. This causes internal vibration and air vibration, generating a thermal effect, thereby producing sound energy loss and ultimately achieving broadband noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of acoustic metamaterials technology, and more specifically to an acoustic metamaterial device and a hair dryer. Background Technology

[0002] With the rapid development of modern society and electronic technology, various consumer electronics, home appliances and portable devices have improved people's convenience and entertainment experience. At the same time, people are paying more and more attention to environmental noise and electrical product noise. The degree of noise reduction has gradually become a selling point and one of the most powerful competitive advantages of products.

[0003] However, in pursuit of portability and aesthetics, the internal structure of modern electronic products is becoming increasingly compact, leaving extremely limited space for acoustic design. Traditional noise reduction solutions (such as porous sound-absorbing materials or sound insulation structures) often fall short in limited spaces, especially when dealing with low-frequency broadband noise, and struggle to achieve the desired noise reduction target. Furthermore, in devices involving high-speed airflow, such as high-speed hair dryers, drones, and fans, noise generation is accompanied by complex airflow-sound coupling effects, which further diminishes the effectiveness of traditional passive noise reduction materials and may even generate additional noise due to airflow impact.

[0004] Therefore, there is an urgent need in this field for a solution that can still achieve noise reduction in a confined space, especially in harsh acoustic environments with high-speed airflow. Utility Model Content

[0005] The purpose of this invention is to provide a novel acoustic metamaterial device that, through a cavity resonant membrane structure arrangement design, utilizes the principle of membrane resonance to reduce broadband noise frequencies, thereby improving the practical value of the product and enhancing the user experience. To achieve the above objectives, this invention provides the following technical solution:

[0006] An acoustic metamaterial device includes a resonant cavity body, an interior cavity, a through hole communicating with the cavity on the surface of the resonant cavity body, a diaphragm covering the through hole on the surface of the resonant cavity body, and the diaphragm vibrating under the excitation of airflow and / or sound waves, thereby inducing air resonance in the cavity through the through hole.

[0007] The present invention is further configured such that: a positioning groove is provided inwardly on the surface of the resonant cavity body, the positioning groove is formed around the circumference of the resonant cavity body, and the diaphragm is disposed in the positioning groove.

[0008] The present invention is further configured such that: the diaphragm is breathable, and the diaphragm is made of a flexible material with damping effect.

[0009] The present invention is further configured such that: a plurality of through holes are provided on the surface of the resonant cavity body, and the plurality of through holes are arranged at equal intervals along the circumferential direction of the resonant cavity body.

[0010] This utility model also proposes a hair dryer, including a housing, a hair dryer motor inside the housing, an air inlet and an air outlet at both ends of the housing, and the aforementioned acoustic metamaterial device, with the resonant cavity body disposed between the hair dryer motor and the air outlet.

[0011] The present invention is further configured such that the front end of the resonant cavity body gradually contracts towards the air outlet.

[0012] The present invention is further configured such that: a cross-shaped positioning post is provided at the front end of the resonant cavity body, and the resonant cavity body is fixed in the shell by the cross-shaped positioning post.

[0013] Compared with the prior art, the present invention has at least the following advantages:

[0014] 1. Utilizing the principle of cavity membrane resonance, within a confined cavity, under the coupling of high-speed airflow and external sound, the membrane at the cavity opening is excited to resonate, causing internal and air vibrations that generate a thermal effect, thereby producing sound energy loss and ultimately achieving broadband noise reduction. Compared to conventional noise reduction methods, it is more suitable for electronic devices in small spaces, and it does not affect the flow rate or generate additional wind noise in high-speed airflow environments, thus improving the practical value of the product and enhancing the user experience.

[0015] 2. By setting positioning grooves on the surface of the resonant cavity body, a precise and stable mounting base is provided for the diaphragm. This structure can effectively prevent the diaphragm from shifting or falling off under the impact of high-speed airflow, ensuring the long-term reliability and consistency of the resonant unit, while also facilitating rapid assembly in industrial production.

[0016] 3. By periodically arranging multiple through holes along the circumference of the resonant diaphragm cavity, and with multiple through holes working simultaneously, the acoustic coupling within the high-speed air duct generates a fixed frequency resonance in the diaphragm region corresponding to each through hole, thereby producing a wide-band noise reduction and achieving the purpose of wide-band noise reduction. When used inside small-sized devices, the above-mentioned frequency resonance is achieved by sharing a cavity, improving the space utilization rate in electronic devices. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the resonant cavity body in this embodiment;

[0018] Figure 2 This is an exploded view of the resonant cavity body of this embodiment;

[0019] Figure 3 This is a cross-sectional view of a hair dryer.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Resonance cavity body; 2. Cavity; 3. Through hole; 4. Diaphragm; 5. Positioning groove; 6. Housing; 7. Air inlet; 8. Air outlet; 9. Blower motor; 10. Air concentrator; 11. Positioning column. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0023] like Figure 1 and Figure 2 As shown, an acoustic metamaterial device includes a resonant cavity body 1, with a closed cavity 2 formed inside. A through-hole 3 communicating with the cavity 2 is formed on the surface of the resonant cavity body 1. A diaphragm 4 is fitted onto the surface of the resonant cavity body 1, covering the through-hole 3. The diaphragm 4 vibrates under airflow and / or sound wave excitation, thereby inducing air resonance within the cavity 2 through the through-hole 3. This internal air vibration generates a thermal effect, resulting in sound energy loss and converting sound energy into heat energy, ultimately achieving broadband noise reduction. Compared to existing noise reduction methods (such as porous sound-absorbing materials or sound insulation structures), this method is more suitable for high-speed airflow scenarios, does not affect the flow rate of the high-speed airflow, and does not generate additional wind noise.

[0024] The resonant cavity body 1 includes a cylindrical section. A positioning groove 5 is recessed inward on the surface of the cylindrical section. The positioning groove 5 is formed around the circumference of the resonant cavity body 1. A through hole 3 is also formed in the positioning groove 5 and communicates with it. A diaphragm 4 is annularly fitted inside the positioning groove 5 and covers the through hole 3. The front and rear ends of the diaphragm 4 are respectively attached to the ends of the positioning groove 5. The positioning groove 5 effectively prevents the diaphragm 4 from shifting or falling off under the impact of high-speed airflow, ensuring the long-term reliability and consistency of the resonant unit. Furthermore, when the diaphragm 4 is fitted inside the positioning groove 5, its surface is flush with the surface of the resonant cavity body 1, and it does not affect the flow rate of the high-speed airflow.

[0025] In this embodiment, multiple through holes 3 are formed on the surface of the resonant cavity body 1, and the multiple through holes 3 are arranged at equal intervals along the circumference of the resonant cavity body 1. The multiple through holes 3 share a diaphragm 4. By non-uniformly generating a fixed frequency resonance on the surface of the diaphragm 4, a wide-band noise reduction can be generated, thereby achieving the purpose of wideband noise reduction. In other embodiments, only one through hole 3 can be formed on the surface of the resonant cavity body 1, and the same wideband noise reduction effect can be achieved by periodically arranging multiple resonant cavity bodies 1.

[0026] The membrane 4 is made of a flexible material with a certain degree of breathability and damping effect. For example, it can be a waterproof and breathable membrane with strong tensile strength, or a material such as SAATI or HD7 with a strength greater than 1000 MKS.

[0027] like Figure 3 As shown, this embodiment also provides a hair dryer, including a housing 6, a hair dryer motor 9 inside the housing 6, and an air inlet 7 and an air outlet 8 at both ends of the housing 6, respectively. The hair dryer motor 9 draws in fresh air from the air inlet 7 and blows it out towards the air outlet 8. A resonant cavity body 1 is provided inside the housing 6, and the resonant cavity body 1 is disposed between the hair dryer motor 9 and the air outlet 8, so that when the high-speed airflow blows past the periphery of the resonant cavity body 1, noise reduction is achieved, while not affecting the airflow speed of the hair dryer and not generating additional wind noise.

[0028] A cross-shaped positioning post 11 is also connected between the resonant cavity body 1 and the housing 6 to improve the stability of the resonant cavity body 1 within the housing 6. The front end of the housing 6 has a concentrator 10, the opening of which gradually narrows forward, with the air outlet 8 located at the front end of the concentrator 10. The front end of the resonant cavity body 1 also gradually narrows towards the air outlet 8, corresponding to the shape of the concentrator 10, thereby reducing wind resistance and making it more suitable for high-speed airflow scenarios in hair dryers.

[0029] The noise reduction principle of this hair dryer is as follows:

[0030] The blower motor 9 blows air towards the air outlet 8. When the high-speed airflow passes through the resonant cavity body 1, the diaphragm 4 is excited to vibrate under the coupling of the high-speed airflow and sound noise, causing the air in the cavity 2 to resonate and generate a thermal effect, thereby converting sound energy into heat energy and generating sound energy loss. Furthermore, through the periodic arrangement of multiple resonant cavity bodies 1 (in this embodiment, multiple through holes 3 are periodically arranged on one resonant cavity body 1), the effect of wideband noise reduction is finally achieved.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An acoustic metamaterial device, characterized in that: The device includes a resonant cavity body, which forms a cavity inside. A through hole communicating with the cavity is opened on the surface of the resonant cavity body. A diaphragm is fitted on the surface of the resonant cavity body, covering the through hole. The diaphragm vibrates under the excitation of airflow and / or sound waves, thereby inducing air resonance in the cavity through the through hole.

2. The acoustic metamaterial device according to claim 1, characterized in that: The resonant cavity body has a positioning groove recessed inward on its surface. The positioning groove is formed around the circumference of the resonant cavity body, and the diaphragm is disposed in the positioning groove.

3. The acoustic metamaterial device according to claim 1, characterized in that: The diaphragm is breathable and is made of a flexible material with damping effect.

4. The acoustic metamaterial device according to claim 1, characterized in that: The resonant cavity body has multiple through holes on its surface, and the multiple through holes are arranged at equal intervals along the circumference of the resonant cavity body.

5. A hair dryer, comprising a housing, wherein a hair dryer motor is disposed within the housing, and an air inlet and an air outlet are respectively provided at both ends of the housing, characterized in that: It also includes an acoustic metamaterial device as described in any one of claims 2-4, wherein the resonant cavity body is disposed between the blower motor and the air outlet.

6. A hair dryer according to claim 5, characterized in that: The front end of the resonant cavity body gradually contracts towards the air outlet.

7. A hair dryer according to claim 5, characterized in that: A cross-shaped positioning post is provided at the front end of the resonant cavity body, and the resonant cavity body is fixed in the shell by the cross-shaped positioning post.

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