Integrated airflow high-power sound source

Abstract

This invention provides an integrated airflow-type high-intensity sound source, relating to the field of sound wave transducer equipment. It includes a motor, with one end of the motor shaft connected to an air pump and the other end connected to a sound source rotor via a reducer. The sound source rotor is rotatably mounted within a sound source stator, which has a sound source port. The sound source rotor has a hollow cavity, and the air pump outlet is connected to the cavity of the sound source rotor via an air guide pipe. Multiple frequency modulation ports are located on the outer wall of the sound source rotor, intermittently aligned with the sound source port. The sound source port is connected to an emitter with a horn-shaped nozzle. When the frequency modulation port is aligned with the sound source port, sound is emitted. Through the deep coupling design of the air compression mechanism and the acoustic modulation structure, the performance bottleneck of traditional high-intensity sound wave generators is overcome, demonstrating irreplaceable technical advantages in the field of acoustic applications. In the field of meteorological intervention, it can successfully output low-frequency sound waves of 30-100Hz, enabling meteorological intervention applications such as artificial rain enhancement and fog dispersal.

Description

Technical Field

[0001] This invention relates to the field of acoustic transducer equipment, and in particular to an integrated airflow-type high-intensity acoustic source. Background Technology

[0002] In recent years, high-intensity acoustic wave (HIAW) technology has shown broad application prospects in meteorological control, public safety, and ecological intervention. For example, using HIAW at specific frequencies and sound pressure levels to achieve functions such as artificial rainmaking, fog and haze dispersal, bird control, and crowd evacuation alerts has become a hot topic in multidisciplinary research. However, traditional HIAW generators typically rely on large electroacoustic transducers or explosive shockwave sources, which are not only bulky, energy-intensive, and slow-responding, but also have significant limitations in terms of structural integration, system stability, and mobile deployment capabilities. For example, the solution described in patent document CN101242683. To address these technical problems, researchers have recently attempted to develop airflow-modulated sound source technology, which generates sound waves by periodically perturbing high-speed airflow. This technology boasts high energy conversion efficiency, simple mechanical structure, and good reliability, and has the potential to achieve lightweight, modular, and low-power operation. However, most of these technologies still face problems such as insufficient sound pressure output, difficulty in frequency control, and low far-field radiation efficiency, making it difficult to meet the demands of high-intensity, long-distance controllable sound wave fields in practical applications. To address the aforementioned issues, there is an urgent need to develop an integrated, unified high-intensity acoustic wave transducer technology that can simultaneously achieve functions such as compressed air supply, frequency modulation, acoustic energy amplification, and directional radiation. This technology would be suitable for dynamic platforms, such as vehicles, aircraft, and drones, enabling rapid deployment and efficient operation in complex environments. This would also promote the practical application of high-intensity acoustic wave technology in the fields of novel meteorological intervention and public safety assurance. Summary of the Invention

[0003] The technical problem this invention aims to solve is to provide an integrated airflow-type high-intensity sound source that can generate a high-intensity sound source through purely mechanical drive. It has wide applicability, and the integrated design reduces overall size and redundant equipment. The use of a variable-speed motor allows for speed matching, overcoming the limitations of existing high-intensity sound source equipment such as large size, high energy consumption, and complex control. Its lightweight design allows the device to be mounted on a vehicle for operations such as rain enhancement, fog dispersal, or bird deterrence. In a preferred embodiment, the frequency of the sound source can be controlled by adjusting the flow cross-section.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an integrated airflow type strong sound source, including a motor, one end of the motor shaft is connected to an air pump, and the other end is connected to the sound source rotor of the sound source mechanism through a reducer; The sound source rotor is rotatably located inside the sound source stator. The sound source stator is provided with a sound source port, and the sound source rotor is provided with a hollow cavity. The outlet of the air pump is connected to the cavity of the sound source rotor through an air guide pipe. Multiple frequency modulation ports are provided on the outer wall of the sound source rotor. The positions of the frequency modulation ports are intermittently aligned with the sound source ports. The sound source ports are connected to an emitter with a horn-shaped nozzle. When the frequency modulation ports are aligned with the sound source ports, the sound source is emitted.

[0005] In the preferred embodiment, the motor is a speed-regulating motor.

[0006] In a preferred embodiment, the air pump is a centrifugal air pump, with the motor shaft connected to the impeller of the centrifugal air pump. The impeller is located inside the volute, with an air inlet at the center of the volute and an outlet at the edge of the volute, the outlet being connected to the air guide pipe.

[0007] In a preferred embodiment, the volute has an involute-shaped cavity, a step is provided near the edge of the cavity, and the outer edge of the impeller has an impeller edge extension located within the step. The impeller edge extension penetrates the inner wall of the volute edge cavity.

[0008] In a preferred embodiment, both ends of the motor shaft are supported within the motor housing by bearings, wherein the bearings are floating bearings.

[0009] In a preferred embodiment, the motor housing is provided with a cooling structure, which includes heat sinks and / or a circulating water jacket.

[0010] In a preferred embodiment, the reducer is a two-stage planetary reducer or an RV reducer.

[0011] In a preferred embodiment, a pressure stabilizing chamber is provided on one side of the hollow cavity of the sound source rotor, the pressure stabilizing chamber is connected to the hollow cavity, and the air guide pipe is connected to the pressure stabilizing chamber.

[0012] In the preferred embodiment, the frequency modulation port of the hollow cavity of the sound source rotor is also equipped with a sound source adjustment mechanism; The sound source adjustment mechanism includes a fixed adjustment frame with an opening at the top and sliding plates on both sides of the adjustment frame. The sliding plates are connected to the adjustment frame by tension springs. As the rotor speed of the sound source increases, the opening cross-section of the adjustment frame increases under the action of centrifugal force.

[0013] In the preferred embodiment, the cross-section of the adjusting frame is triangular, a top rod is provided at the top of the adjusting frame, one end of the tension spring is connected to the sliding plate, and the other end of the tension spring is connected to the top rod; The adjustment frame is provided with a slide groove, and the slide plate is provided with a slider. The slider slides within the slide groove, and a limit block is provided within the slide groove.

[0014] Existing high-power sound source transducers are mainly divided into two categories: one is electroacoustic high-power sound sources, such as high-power loudspeaker arrays and ultrasonic transducer arrays, which rely on electrical signals to drive the vibration of piezoelectric ceramics or electromagnetic coils to generate sound; the other is deflagration or shock wave sound sources, which generate high-intensity shock waves by instantaneously releasing energy from fuel. Although these two types of technologies can achieve high sound pressure output in specific scenarios, they generally suffer from drawbacks such as large size, high power consumption, slow response, complex structure, unstable frequency, and unsafe operation, making them difficult to meet the application requirements of high mobility, controllability, and reliability. In recent years, fluid modulation sound sources have gradually attracted attention due to their simple structure, high reliability, high sound pressure level, and high sound power. Some studies have proposed methods to generate sound waves by modulating high-pressure airflow through structures such as slits and nozzles, but these devices usually have problems such as the separation of the air compression system and the airflow modulation system, loose structure, large overall size and weight of the equipment, complex assembly, and complex operation. They also lack the technical conditions for one-button start-up or unattended operation, which restricts their practical application. Based on existing technologies, this invention proposes an integrated airflow-type high-power sound source structure that combines air compression, frequency modulation, and sound energy radiation enhancement. It innovatively integrates an air compression system and an airflow modulation system, and introduces a built-in airflow modulation cavity structure and a gradually expanding cylindrical coupled emitter design. This invention uses a single high-efficiency motor to achieve efficient air compression, sound wave modulation, and far-field radiation amplification, effectively improving sound energy conversion efficiency and controllability. It boasts comprehensive advantages such as compact structure, adjustable frequency, high sound pressure, and long-range radiation. The impeller features an extended impeller edge structure to increase the impeller outer diameter and a high-precision impeller coupling structure, increasing the air delivery linear velocity and significantly improving air pressure. A compact airflow path reduces energy loss. The sound source adjustment mechanism dynamically adjusts the sound source frequency according to the motor speed to meet the needs of different operating conditions.

[0015] The integrated airflow-type high-intensity sound source technology proposed in this invention, through the deep coupling design of the air compressor mechanism and the acoustic modulation structure, breaks through the performance bottleneck of traditional high-intensity sound wave generators, demonstrating irreplaceable technical advantages in the field of acoustic applications. In the field of meteorological intervention (artificial rain / snow enhancement, fog / haze reduction), this invention can successfully output low-frequency sound waves of 30-100Hz, with an effective height of up to 5000 meters and a coverage area of ​​10-30km², more than twice that of traditional technologies. It can realize meteorological intervention applications such as artificial rain enhancement and fog dispersal, with significantly enhanced sound wave penetration, providing meteorological departments with a new, efficient, and safe operational tool.

[0016] In the field of public safety (crowd dispersal, bird deterrence with sound waves), this invention achieves adjustable sound wave output across the entire frequency band from 30-3000Hz, with a sound pressure level controlled at 150-160dB and an effective range of up to 1000 meters, significantly improving performance compared to traditional equipment. Particularly in border protection scenarios, the 30-3000Hz wide-range sound barrier can cover areas beyond the attack range of conventional weapons, effectively blocking illegal intrusion and achieving "silent deterrence and precise control."

[0017] In the field of high-intensity sound laboratories, this invention achieves full-frequency testing capability from 20Hz to 2000Hz, with a stable sound pressure level of 155-160dB, which is 4-6dB higher than the world's most advanced high-intensity sound equipment. This not only meets the basic research needs of metal fatigue testing, sound-absorbing material evaluation, and acoustic metamaterial development, but also supports the entire chain of applications from laboratory research to engineering verification through modular design, significantly improving the efficiency of laboratory configuration.

[0018] Technological breakthrough advantages: The greatest advantage of this technology lies in the high integration of the airflow-modulated acoustic system. Previously separate air compression and airflow modulation modules are integrated and assembled using a single rotating shaft, making the system more compact, with fewer components, and more reliable in operation. Simultaneously, the system deployment is more flexible, with the overall volume reduced by at least one-third. This allows the equipment to be adapted to various mobile platforms, such as vehicle-mounted platforms (1.5m³ space), drones, and unmanned boats, achieving rapid deployment and efficient operation. This significantly enhances the portability and practicality of the equipment, effectively solving the drawbacks of traditional airflow modulation sound source systems, such as loose assembly, complex assembly, and difficulty in mobile deployment.

[0019] In terms of sound modulation, this invention employs a sound source adjustment mechanism based on centrifugal force. This mechanism can adjust sound intensity and frequency by changing the rotational speed. Through a "dual-dimensional dynamic balance" mechanism—that is, as the rotational speed increases, the air pressure and flow rate increase, and the opening of the frequency modulation port also increases accordingly—coordinated control of noise intensity and frequency is achieved. By replacing springs with different elastic moduli, the sound frequency and intensity can be adjusted in a targeted manner, thus enhancing the flexibility of the invention's application scenarios.

[0020] This invention not only solves the core problems of traditional high-intensity sound wave generators, such as complex structure, high energy consumption, and difficulty in frequency control, but also optimizes the acoustic structure through integrated design, achieving a balance between acoustic performance and system compactness. It forms a technological barrier in multiple fields, including meteorological intervention, public safety, and high-intensity sound experimental research, opening up a new dimension for acoustic applications. Its technological advancement and practical value have been recognized, providing a solid foundation for large-scale industrialization. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is the front view of the present invention.

[0022] Figure 2 yes Figure 1 Sectional view at point B.

[0023] Figure 3 This is a partially enlarged schematic diagram of the sound source rotor.

[0024] Figure 4 This is a front view of a preferred embodiment of the present invention.

[0025] Figure 5 yes Figure 4 Sectional view at point C.

[0026] Figure 6 This is a partially enlarged schematic diagram of the preferred scheme for the sound source rotor.

[0027] Figure 7 yes Figure 1 Sectional view at point A.

[0028] In the figure, impeller 1, impeller edge extension 101, volute 2, end cover 3, bearing 4, motor housing 5, motor stator 6, motor rotor 7, motor shaft 8, reducer 9, auxiliary ejector 10, sound source stator 11, sound source rotor 12, pressure stabilizing chamber 13, air guide pipe 14, planetary gear 15, planetary carrier 16, output disk 17, sun gear 18, frequency modulation port 19, sound source housing 20, sound source adjustment mechanism 21, push rod 211, tension spring 212, opening 213, slide plate 214, adjustment frame 215, slide groove 216, slider 217, internal gear ring 22, sound source port 23. Detailed Implementation

[0029] Example 1: like Figures 1-3 In 7, an integrated airflow-type strong sound source includes a motor, one end of the motor shaft 8 is connected to an air pump, and the other end is connected to the sound source rotor 12 of the sound source mechanism through a reducer 9. The sound source rotor 12 is rotatably disposed inside the sound source stator 11. The sound source stator 11 is provided with a sound source port 23. The sound source rotor 12 is provided with a hollow cavity. The outlet of the air pump is connected to the cavity of the sound source rotor 12 through the air guide pipe 14. Multiple frequency tuning ports 19 are provided on the outer wall of the sound source rotor 12. The positions of the frequency tuning ports 19 are intermittently aligned with the sound source ports 23. The sound source ports 23 are connected to an emitter 10 with a horn-shaped nozzle. When the frequency tuning ports 19 are aligned with the sound source ports 23, a sound source is emitted. With this structure, the rotation of the motor shaft 8 drives the air pump to generate compressed air. The compressed air enters the sound source rotor 12, and the rotation of the motor shaft 8 also drives the sound source rotor 12 to rotate. The positions of the frequency tuning ports 19 and the sound source ports 23 are intermittently aligned, and the compressed air is intermittently ejected from the emitter 10, generating a strong sound source. The advantage of this invention is its integrated structure, which facilitates arrangement and movement.

[0030] Preferred solutions include Figure 2 , 3 In this invention, the motor is a speed-regulating motor. Preferably, it is a variable-frequency permanent magnet DC motor. The variable-frequency permanent magnet DC motor has an adjustable speed from 500 rpm to 8000 rpm, enabling the invention to dynamically adjust the input air source pressure and flow rate, and precisely control the spectral characteristics, sound pressure level, and directivity of the acoustic output. When the rotor rotates, the frequency modulation port 19 and the sound source port 23 periodically align or misalign, forming a pulsed airflow. Interruption of the airflow causes a sudden pressure change. During the conduction phase, the airflow passes through the sound source port 23 at high speed, causing a sudden drop in local pressure. During the blocking phase, the airflow is cut off, and the pressure recovers instantaneously. This periodic pressure change forms the fundamental frequency of the sound wave, with the frequency f calculated as follows: f = ; Where m: number of circumferential openings on the frequency-modulated rotor, n: speed of the high-speed permanent magnet motor (RPM), and k: speed ratio of the transmission.

[0031] Preferred solutions include Figure 1 In this design, the air pump is a centrifugal air pump. The motor shaft 8 is connected to the impeller 1 of the centrifugal air pump. The impeller 1 is located inside the volute 2. The volute 2 has an air inlet at its center and an outlet at its edge, which is connected to the air guide pipe 14. The high-speed rotation of the impeller 1 generates continuous compressed air.

[0032] Example 2: Preferred solutions include Figure 4 In the design, the volute 2 has an involute-shaped cavity with a stepped section near the edge of the cavity. The impeller 1 has an impeller edge extension 101 on its outer edge, which is located within the stepped section. This structure improves the coupling accuracy between the impeller and the volute, and by suppressing flow losses under high-speed conditions, it achieves a nonlinear improvement in aerodynamic efficiency, enabling the invention to obtain synergistic gains in wind pressure and flow rate at high speeds.

[0033] The impeller edge extension 101 penetrates the inner wall of the edge cavity of the volute 2. This structure increases the diameter of the impeller 1 and improves the air compression ratio.

[0034] Preferred solutions include Figure 4 In this configuration, both ends of the motor shaft 8 are supported within the motor housing 5 by bearings 4, which are floating bearings. Preferably, magnetic levitation bearings are used.

[0035] Preferred solutions include Figure 4 In this example, the motor housing 5 is equipped with a cooling structure, which includes heat sinks and / or a circulating water jacket. The example uses a structure consisting of heat sinks and a circulating water jacket.

[0036] Preferred solutions include Figure 4 , 7 In this example, the reducer 9 is a two-stage planetary reducer or an RV reducer. A two-stage planetary reducer is used in this example.

[0037] Preferred solutions include Figure 4 In the process, a pressure stabilizing chamber 13 is provided on one side of the hollow cavity of the sound source rotor 12. The pressure stabilizing chamber 13 is connected to the hollow cavity, and the air guide pipe 14 is connected to the pressure stabilizing chamber 13.

[0038] Preferred solutions include Figures 4-6 In the hollow cavity of the sound source rotor 12, the frequency modulation port 19 is also provided with a sound source adjustment mechanism 21; The sound source adjustment mechanism 21 includes a fixed adjustment frame 215, with an opening at the top of the adjustment frame 215 and sliding plates 214 on both sides of the adjustment frame 215. The sliding plates 214 are connected to the adjustment frame 215 by a tension spring 212. Preferred solutions include Figure 5 In this design, the regulating frame 215 has a triangular cross-section, resembling a gantry frame. Fixed baffles are located near the bottom of the regulating frame 215, with the opening between the baffles larger than the flow cross-section of the frequency modulation port 19 or the sound source port 23. The regulating frame 215 itself has minimal impact on airflow. A top rod 211 is located at the top of the regulating frame 215. One end of a tension spring 212 is connected to a sliding plate 214, and the other end of the tension spring 212 is connected to the top rod 211. During rotation, the sliding plates 214, under the influence of centrifugal force, move towards the edge of the cavity of the sound source rotor 12, thereby increasing the distance between the sliding plates 214 and thus increasing the opening between them. Consequently, the flow cross-section between the frequency modulation port 19 and the sound source port 23 increases.

[0039] A sliding groove 216 is provided on the adjusting frame 215, and a slider 217 is provided on the sliding plate 214. The slider 217 slides within the sliding groove 216, and a limiting block is provided within the sliding groove 216 to limit the stroke of the slider 217. As the rotational speed of the sound source rotor 12 increases, the opening cross-section of the adjusting frame 215 increases under the action of centrifugal force. That is, the higher the motor speed, the larger the flow cross-section between the frequency modulation port 19 and the sound source port 23, thus achieving coordinated control of noise intensity and frequency.

[0040] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely illustrative descriptions of the application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of the claims and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. An integrated airflow-type high-intensity sound source, including a motor, characterized in that: One end of the motor shaft (8) of the motor is connected to the air pump, and the other end is connected to the sound source rotor (12) of the sound source mechanism through the reducer (9); The sound source rotor (12) is rotatably disposed inside the sound source stator (11). The sound source stator (11) is provided with a sound source port (23). The sound source rotor (12) is provided with a hollow cavity. The outlet of the air pump is connected to the cavity of the sound source rotor (12) through the air guide pipe (14). Multiple frequency modulation ports (19) are provided on the outer wall of the sound source rotor (12). The positions of the frequency modulation ports (19) are intermittently aligned with the sound source port (23). The sound source port (23) is connected to the emitter (10) with a horn mouth. When the frequency modulation port (19) is aligned with the sound source port (23), the sound source is emitted.

2. The integrated airflow-type high-intensity sound source according to claim 1, characterized in that: The motor mentioned is a speed-regulating motor.

3. The integrated airflow-type high-intensity sound source according to claim 1, characterized in that: The air pump is a centrifugal air pump. The motor shaft (8) is connected to the impeller (1) of the centrifugal air pump. The impeller (1) is located inside the volute (2). The center of the volute (2) is provided with an air inlet, and the edge of the volute (2) is provided with an outlet. The outlet is connected to the air guide pipe (14).

4. The integrated airflow-type high-intensity sound source according to claim 3, characterized in that: The volute (2) has an involute-shaped cavity and a step is provided near the edge of the cavity. The outer edge of the impeller (1) has an impeller edge extension (101) located inside the step. The impeller edge extension (101) penetrates the inner wall of the edge cavity of the volute (2).

5. The integrated airflow-type high-intensity sound source according to claim 1, characterized in that: The two ends of the motor shaft (8) are supported in the motor housing (5) by bearings (4), and the bearings (4) are floating bearings.

6. The integrated airflow-type high-intensity sound source according to claim 5, characterized in that: The motor housing (5) is provided with a cooling structure, which includes heat sinks and / or a circulating water jacket.

7. The integrated airflow-type high-intensity sound source according to claim 1, characterized in that: The speed reducer (9) is a two-stage planetary speed reducer or an RV speed reducer.

8. The integrated airflow-type high-intensity sound source according to claim 1 or 3, characterized in that: A pressure stabilizing chamber (13) is provided on one side of the hollow cavity of the sound source rotor (12). The pressure stabilizing chamber (13) is connected to the hollow cavity, and the air guide pipe (14) is connected to the pressure stabilizing chamber (13).

9. The integrated airflow-type high-intensity sound source according to claim 8, characterized in that: The frequency modulation port (19) of the hollow cavity of the sound source rotor (12) is also provided with a sound source adjustment mechanism (21). The sound source adjustment mechanism (21) includes a fixed adjustment frame (215), the top of the adjustment frame (215) is provided with an opening, and the two sides of the adjustment frame (215) are provided with sliding plates (214), which are connected to the adjustment frame (215) by a tension spring (212); As the rotational speed of the sound source rotor (12) increases, the sliding plate (214) increases the opening cross section of the adjusting frame (215) under the action of centrifugal force.

10. The integrated airflow-type high-intensity sound source according to claim 1 or 3, characterized in that: The cross-section of the adjustment frame (215) is triangular. A top rod (211) is provided at the top of the adjustment frame (215). One end of the tension spring (212) is connected to the slide plate (214), and the other end of the tension spring (212) is connected to the top rod (211). A slide groove (216) is provided on the adjustment frame (215), and a slider (217) is provided on the slide plate (214). The slider (217) slides within the slide groove (216), and a limiting block is provided within the slide groove (216).

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