Circumferential radiation multi-element oscillator efficient electrodynamic transducer

Abstract

The invention provides a multi-element oscillator efficient electrodynamic transducer with circumferential radiation, and belongs to the field of underwater acoustic transducers. The problems that in the prior art, a plurality of electric transducers are arranged, the occupied space is large, and installation is complex are solved. The invention discloses a multi-vibrator pressure balance air bag which comprises a shell, a plurality of driving vibrators and a pressure balance air bag, the shell comprises a center ring body and a plurality of vibrator cover plates, the center ring body is provided with a plurality of containing holes at intervals in the circumferential direction, the vibrator cover plates cover one ends of the containing holes, the plurality of driving vibrators are located in the plurality of containing holes in a one-to-one correspondence mode, the plurality of driving vibrators are electrically connected, and the pressure balance air bag is arranged between the plurality of driving vibrators. The same-amplitude and same-phase current is loaded on the multiple driving vibrators to generate radial sound radiation, the pressure balance air bag is arranged on the inner wall of a center hole of the center ring body, gas in the pressure balance air bag is communicated with gas in the multiple driving vibrators, and the vibrator cover plate and the pressure balance air bag are located at the two ends of the driving vibrators respectively. The device can improve the radiation sound power and the electroacoustic efficiency, is convenient to install, and does not occupy the internal space of the unmanned underwater vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater acoustic transducers, and in particular relates to a multi-element vibrator high-efficiency electric transducer with circular radiation. Background Art

[0002] Sound waves are the only energy carrier that can propagate over long distances in seawater. Acoustic methods are the main means for humans to explore and develop the ocean. Transducers are key equipment in underwater acoustic research. According to different working conditions, transducers are divided into two categories: one is the transmitting transducer, which converts electrical signals into mechanical energy and drives the radiation medium to vibrate, and then converts electrical signals into acoustic signals and transmits information to the outside; the other is the receiving transducer, which receives external acoustic signals and converts them into electrical signals, and identifies the information in the acoustic signals after amplification and processing.

[0003] Transducers include piezoelectric transducers, electric transducers, rare earth transducers, etc. There is a theoretical contradiction between piezoelectric transducers in small size, low frequency and high power sound emission. For example, in order to keep the transducer at a high emission efficiency and radiated sound power during operation, the transducer usually operates in a resonant state, and the resonant frequency of a common piezoelectric transducer is inversely proportional to the size of its functional material, that is, a lower resonant frequency means a larger and heavier transducer. In addition, since the radiated sound power is positively correlated with the radiation resistance and the vibration velocity of the radiation surface, and the radiation resistance is positively correlated with the area of ​​the radiation surface and the vibration frequency, under the premise of keeping the vibration velocity of the radiation surface unchanged, reducing the operating frequency and reducing the size of the radiation surface will greatly reduce the radiated sound power. Therefore, while reducing the size of the transducer and reducing the operating frequency, in order to keep the radiated sound power of the transducer unchanged or increase it, the vibration velocity of the radiation surface must be greatly increased to obtain sufficient volume velocity, but due to the limitations of the driving module power and the mechanical strength of the transducer itself, it is often difficult to achieve the purpose of low frequency, small size and high power emission by greatly increasing the vibration velocity of the radiation surface.

[0004] The electrodynamic transducer is a kind of ultra-low frequency transmitting transducer commonly used in the field of underwater acoustic technology. Its working mechanism is similar to that of the dynamic loudspeaker commonly used in air. Unlike common piezoelectric and rare earth transducers, the working frequency of the electrodynamic transducer does not depend on its own structural size, but is related to the stiffness of the suspension spring in the transducer and the mass of the movable parts. Therefore, by using a more flexible suspension spring, the resonant frequency of the transducer can be set at tens of hertz or even more than ten hertz, so that the lower limit of the working frequency of the electrodynamic transducer can be extended to several hertz. Therefore, the electrodynamic transducer has the characteristics of small size, ultra-low frequency, and ultra-wideband transmission; the mechanical vibration model of the electrodynamic transducer can be regarded as a single-degree-of-freedom mass-spring-damper mechanical vibration system, and the sound radiation model can be regarded as a single-sided piston sound radiation under low-frequency conditions. The electrodynamic transducer has a flat sound source level response in a fairly wide frequency band above the resonant frequency. These performance characteristics make the electrodynamic transducer often used in underwater acoustic countermeasure equipment such as ship radiation noise simulators, acoustic decoys, sonar calibration systems, and pipeline anechoic experiments.

[0005] However, in the prior art, due to the extremely low radiation resistance of the electric transducer in the low frequency band, the electroacoustic efficiency of a single electric transducer is low, usually less than 1%. By rationally utilizing the mutual radiation effect of multiple electric transducers in close proximity, the low-frequency radiation resistance can be improved, thereby improving the radiated sound power and electroacoustic efficiency. However, arranging multiple electric transducers in close proximity not only takes up a large space, but also is complicated to install. Summary of the invention

[0006] In view of this, in order to solve the problem in the prior art that the low-frequency radiation resistance is improved by reasonably utilizing the mutual radiation effect of multiple electric transducers in close proximity, but the close arrangement of multiple electric transducers not only occupies a large space but is also complicated to install, the present invention proposes a circularly radiating multi-element high-efficiency electric transducer.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A circular radiation multi-element vibrator high-efficiency electrodynamic transducer, comprising:

[0009] The housing comprises a central ring body and a plurality of vibrator cover plates, wherein the central ring body is provided with a plurality of accommodating holes spaced apart along its circumferential direction, wherein the plurality of accommodating holes correspond to the plurality of vibrator cover plates one by one, and the vibrator cover plates are covered at one end of the accommodating holes;

[0010] A plurality of driving vibrators, the plurality of driving vibrators are located in the plurality of accommodating holes in a one-to-one correspondence, the plurality of driving vibrators are electrically connected, and currents of the same amplitude and phase are loaded on the plurality of driving vibrators to generate radial sound radiation;

[0011] A pressure-balancing airbag, wherein the central ring body has a central hole, the pressure-balancing airbag is arranged on the inner wall of the central hole, and the gas inside the pressure-balancing airbag is connected to the gas inside multiple driving vibrators, and the vibrator cover and the pressure-balancing airbag are respectively located at both ends of the driving vibrator.

[0012] As a preferred solution of the above-mentioned circularly radiating multi-vibrator high-efficiency electric transducer, the driving vibrator includes a radiating surface, a positioning rod, a spring, an upper magnetic circuit, a permanent magnet magnetic ring, a coil, an outer magnetic circuit, an exciter base and a central filling piece. The outer magnetic circuit is fixedly arranged on the exciter base, the central filling body is fixedly connected to the exciter base, the upper magnetic circuit and the permanent magnet magnetic ring are both located between the outer magnetic circuit and the central filling body, the coil is located between the upper magnetic circuit and the outer magnetic circuit, one end of the positioning rod is fixedly connected to the radiating surface, and the other end is slidably connected to the exciter base, and the spring is sleeved on the positioning rod.

[0013] As a preferred solution of the above-mentioned circular radiation multi-element high-efficiency electrodynamic transducer, the positioning rod is connected to the exciter base via a linear bearing.

[0014] As a preferred solution of the above-mentioned circular radiation multi-element vibrator high-efficiency electrodynamic transducer, the vibrator cover is provided with a plurality of first through holes.

[0015] As a preferred solution of the above-mentioned circular radiation multi-vibrator high-efficiency electrodynamic transducer, a rubber membrane is provided between the driving vibrator and the vibrator cover.

[0016] As a preferred solution of the above-mentioned circularly radiating multi-element high-efficiency electric transducer, the circularly radiating multi-element high-efficiency electric transducer also includes two side cover plates, both of which are fixedly connected to the central ring body, and the two side cover plates are respectively covered at both ends of the central hole.

[0017] As a preferred solution of the above-mentioned circular radiation multi-element high-efficiency electrodynamic transducer, a plurality of second through holes are provided on the side cover plate.

[0018] As a preferred solution of the above-mentioned circular radiation multi-element high-efficiency electrodynamic transducer, a handle is fixedly provided on the central ring body.

[0019] As a preferred solution of the above-mentioned circularly radiating multi-element high-efficiency electric transducer, the pressure-balancing airbag is a thin-walled rubber bag.

[0020] As a preferred solution of the above-mentioned circular radiation multi-element vibrator high-efficiency electrodynamic transducer, a circular hole is provided on the side of the central ring body, and the circular hole can realize the connection between the driving vibrator and the transmission cable.

[0021] Compared with the prior art, the circular radiation multi-element high-efficiency electrodynamic transducer provided by the present invention has the following beneficial effects:

[0022] 1. The present invention provides a circularly radiating multi-vibrator high-efficiency electric transducer, wherein the central ring body is the transducer frame, a relatively large central hole is provided in the middle of the central ring body for accommodating a pressure-balancing airbag, and a plurality of relatively small accommodating holes are provided along the circumferential direction for accommodating driving vibrators and connecting the driving vibrators and the gas environment of the pressure-balancing airbag. The function of the pressure-balancing airbag is to maintain the pressure balance between the outside of the radiation surface of each driving vibrator and the inside of the central hole, that is, to maintain the pressure balance above and below the driving vibrator, thereby ensuring that the radiation surface works in a balanced position. The size of the pressure-balancing airbag determines the maximum working depth of the electric transducer. A plurality of driving vibrators are embedded in the annular central ring body along the circumferential direction, and share the pressure-balancing airbag.

[0023] 2. The present invention provides a circularly radiating multi-vibrator high-efficiency electric transducer, wherein the number of driving vibrators of the circularly radiating multi-vibrator high-efficiency electric transducer is N, where N≥2. When the circularly radiating multi-vibrator high-efficiency electric transducer operates in a low-frequency band, the spacing between the driving vibrators is much smaller than the wavelength, and the mutual radiation effect between the driving vibrators is strong, resulting in a large mutual radiation resistance. The radiation resistance of each driving vibrator is N times that of when it radiates alone, and the radiated sound power and electroacoustic efficiency both become N times that of when it radiates alone at the same vibration speed. The low-frequency radiated sound power of the entire circularly radiating multi-vibrator high-efficiency electric transducer is N times that of when a single driving vibrator radiates alone. 2 times, the sound source level of the transducer can be increased by 20lgN.

[0024] This circularly radiating multi-vibrator high-efficiency electric transducer utilizes the small size and low-frequency acoustic emission characteristics of the electric transducer, and utilizes the strong mutual radiation effect between multiple driving vibrators to greatly improve the radiation resistance of the driving vibrator in the low-frequency band, and significantly improves the radiated acoustic power and electroacoustic efficiency of the electric transducer in the low-frequency band.

[0025] 3. The present invention provides a circularly radiating multi-element high-efficiency electric transducer. The circularly radiating multi-element high-efficiency electric transducer can be used as a compartment of an underwater vehicle and can be conformally installed between two compartments of an underwater unmanned vehicle (UUV). It does not increase the resistance of the underwater vehicle and makes reasonable use of the internal volume of the underwater unmanned vehicle. It is easy to install and does not occupy the internal space of the underwater unmanned vehicle.

[0026] This circular radiation multi-element high-efficiency electric transducer can be used in underwater ship radiation noise simulators, acoustic decoys, noise jammers and other water acoustic countermeasure equipment, as well as sonar calibration systems and pipeline anechoic experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 is a cross-sectional view of a multi-element high-efficiency electrodynamic transducer with circular radiation provided by a specific embodiment of the present invention;

[0029] Figure 2 It is a schematic structural diagram of a driving vibrator of a circular radiation multi-vibrator high-efficiency electrodynamic transducer provided by a specific embodiment of the present invention;

[0030] Figure 3 It is a structural schematic diagram of a multi-element high-efficiency electrodynamic transducer with circular radiation provided by a specific embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the installation position of a circular radiation multi-element high-efficiency electrodynamic transducer provided in a specific embodiment of the present invention.

[0032] In the figure:

[0033] 1. Driving vibrator; 2. Center ring body; 3. Pressure balance airbag; 4. Radiating surface; 5. Positioning rod; 6. Upper magnetic circuit; 7. Permanent magnet ring; 8. Vibrator cover; 9. Coil; 10. External magnetic circuit; 11. Exciter base; 12. Center filling piece; 13. Spring; 14. Round hole; 15. Handle; 16. Side cover;

[0034] 100. The compartment of an underwater vehicle. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] See also Figure 1-4 To describe this embodiment, the present invention provides a circularly radiating multi-vibrator high-efficiency electric transducer, which comprises a shell, a plurality of driving vibrators 1 and a pressure-balancing airbag 3. The shell comprises a central ring body 2 and a plurality of vibrator covers 8. The central ring body 2 is provided with a plurality of accommodating holes spaced apart along its circumferential direction. The plurality of accommodating holes correspond to the plurality of vibrator covers 8 one-to-one. The vibrator cover 8 is covered at one end of the accommodating holes. The plurality of driving vibrators 1 are located in the plurality of accommodating holes one-to-one. The plurality of driving vibrators 1 are electrically connected. Currents of the same amplitude and phase are loaded on the plurality of driving vibrators 1 to generate radial sound radiation. The central ring body 2 has a central hole. The pressure-balancing airbag 3 is arranged on the inner wall of the central hole. The gas inside the pressure-balancing airbag 3 is connected to the gas inside the plurality of driving vibrators 1. The vibrator cover 8 and the pressure-balancing airbag 3 are respectively located at the two ends of the driving vibrator 1.

[0040] The multi-vibrator high-efficiency electric transducer with circumferential radiation, the central ring body 2 is the transducer frame, a large central hole is provided in the middle of the central ring body 2, which is used to place the pressure balance airbag 3, and a plurality of smaller accommodating holes are provided along the circumferential direction, which are used to place the driving vibrator 1 and connect the gas environment of the driving vibrator 1 and the pressure balance airbag 3. The function of the pressure balance airbag 3 is to maintain the pressure balance between the radiation surface 4 outside the driving vibrator 1 and the center hole, that is, to maintain the pressure balance above and below the driving vibrator 1, thereby ensuring that the radiation surface 4 works in a balanced position. The size of the pressure balance airbag 3 determines the maximum working depth of the electric transducer. Multiple driving vibrators 1 are embedded in the annular central ring body 2 along the circumferential direction, and share the pressure balance airbag 3. When multiple driving vibrators 1 are arranged at a close distance, according to the mutual radiation principle in the sound field, the radiated sound power of each driving vibrator 1 is multiple times that of a single sound radiation, and the electroacoustic efficiency of the driving vibrator 1 also becomes multiple times that of a single radiation. Therefore, the electrodynamic transducer composed of a plurality of driving vibrators 1 has the characteristic of efficient emission, which improves the radiated sound power and electroacoustic efficiency of the electrodynamic transducer.

[0041] The circularly radiated multi-element high-efficiency electrodynamic transducer, such as Figure 4 As shown, it can be used as a compartment of an underwater vehicle and can be conformally installed between two compartments of an underwater unmanned vehicle (UUV), without increasing the resistance of the underwater vehicle and making reasonable use of the internal volume of the underwater unmanned vehicle. It is easy to install and does not occupy the internal space of the underwater unmanned vehicle.

[0042] This circular radiation multi-element high-efficiency electric transducer can be used in underwater ship radiation noise simulators, acoustic decoys, noise jammers and other water acoustic countermeasure equipment, as well as sonar calibration systems and pipeline anechoic experiments.

[0043] In this embodiment, the number of driving vibrators 1 is N, where N≥2. When the circular radiation multi-vibrator high-efficiency electrodynamic transducer works in the low frequency band, the spacing between the driving vibrators 1 is much smaller than the wavelength, and the mutual radiation effect between the driving vibrators 1 is strong, resulting in a large mutual radiation resistance. The radiation resistance of each driving vibrator 1 is N times that of a single radiation, and the radiation sound power and electroacoustic efficiency are both N times that of a single radiation at the same vibration speed. The low-frequency radiation sound power of the entire circular radiation multi-vibrator high-efficiency electrodynamic transducer is N times that of a single driving vibrator 1 when it radiates alone. 2 times, the sound source level of the transducer can be increased by 20lgN.

[0044] The circularly radiating multi-vibrator high-efficiency electric transducer utilizes the small size and low-frequency sound emission characteristics of the electric transducer, and utilizes the strong mutual radiation effect between multiple driving vibrators 1 to greatly improve the radiation resistance of the driving vibrator 1 in the low-frequency band, and significantly improves the radiated sound power and electroacoustic efficiency of the electric transducer in the low-frequency band.

[0045] It can be understood that the electrical connection between the multiple driving vibrators 1 can be a series connection, a parallel connection, or a series connection of several and then a parallel connection.

[0046] In this embodiment, the receiving hole is T-shaped, and the driving vibrator 1 is also T-shaped. After the driving vibrator 1 is inserted into the T-shaped receiving hole, the vibrator cover plate 8 is covered, and bolts are used to fix each driving vibrator 1 to the central ring body 2. While ensuring the water tightness of the driving vibrator 1, the pressure balance airbag 3 is fully in contact with the water environment.

[0047] Alternatively, if Figure 2 As shown, the driving vibrator 1 includes a radiation surface 4, a positioning rod 5, a spring 13, an upper magnetic circuit 6, a permanent magnet ring 7, a coil 9, an outer magnetic circuit 10, an exciter base 11 and a central filling member 12. The outer magnetic circuit 10 is fixedly arranged on the exciter base 11, the central filling member is fixedly connected to the exciter base 11, the upper magnetic circuit 6 and the permanent magnet ring 7 are both located between the outer magnetic circuit 10 and the central filling member, the coil 9 is located between the upper magnetic circuit 6 and the outer magnetic circuit 10, one end of the positioning rod 5 is fixedly connected to the radiation surface 4, and the other end is slidably connected to the exciter base 11, and the spring 13 is sleeved on the positioning rod 5. Among them, the radiation surface 4 uses the positioning rod 5 to realize axial reciprocating vibration, and the radiation surface 4 and the exciter base 11 are connected by a spring 13 to provide a restoring force.

[0048] Optionally, a rubber film is provided between the driving vibrator 1 and the vibrator cover 8. The rubber film is vulcanized at the edge of the radiation surface 4, and the outer edge of the rubber film is pressed by the vibrator cover 8 and the external magnetic circuit 10, which plays a role in watertightness and airtightness of the inside of the transducer. While ensuring the watertightness of the driving vibrator 1, the pressure balancing airbag 3 and the rubber film wrapped on the radiation surface 4 of each driving vibrator 1 are fully in contact with the water environment.

[0049] Optionally, the positioning rod 5 is connected to the exciter base 11 via a linear bearing.

[0050] Optionally, the vibrator cover plate 8 is provided with a plurality of first through holes. The vibrator cover plate 8 is provided with densely packed circular first through holes in the center thereof, which play a role of sound transmission. The vibrator cover plate 8 protects the radiation surface 4 and the rubber membrane while making the rubber membrane fully contact with the external water environment. The periphery of the vibrator cover plate 8 is connected to the central ring body 2 by bolts.

[0051] Optionally, the circular radiation multi-element high-efficiency electric transducer further includes two side cover plates 16, both of which are fixedly connected to the central ring body 2, and the two side cover plates 16 are respectively covered at both ends of the central hole. The side cover plates 16 are connected to the central ring body 2 by bolts, and the pressure balance airbag 3 is located between the two side cover plates 16, and the side cover plates 16 play a role in protecting the pressure balance airbag 3.

[0052] Optionally, a plurality of second through holes are provided on the side cover plate 16. The center of the side cover plate 16 is also provided with densely packed circular second through holes, so that the side cover plate 16 can protect the pressure balancing airbag 3 while allowing the pressure balancing airbag 3 to fully contact with the external water environment.

[0053] Optionally, the central ring body 2 is fixedly provided with a handle 15. It is understandable that a base is welded to the side of the central ring body 2, and a handle 15 is welded to the base. In this embodiment, two sets of handles 15 are provided on the central ring body 2.

[0054] Optionally, a circular hole 14 pointing to the center of the circle is provided on the side of the central ring body 2 for installing a plug-in underwater connector to connect each driving vibrator 1 to a transmission cable.

[0055] Optionally, the pressure balancing airbag 3 is a thin-walled rubber bag. The pressure balancing airbag 3 is attached to the inner wall of the central hole of the central ring body 2 after vulcanization.

[0056] Optionally, the central ring body 2 is made of corrosion-resistant metal material. The central ring body 2 can be made of corrosion-resistant metal such as stainless steel, titanium alloy, etc.

[0057] Optionally, the vibrator cover plate 8 is made of a corrosion-resistant metal such as a titanium alloy, and the side cover plate 16 is made of a corrosion-resistant metal such as a titanium alloy.

[0058] Obviously, the embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can understand and use the present invention well. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A multi-element high-efficiency electrodynamic transducer with circular radiation, characterized in that: include: The shell comprises a central ring body (2) and a plurality of vibrator cover plates (8), wherein the central ring body (2) is provided with a plurality of accommodating holes spaced apart along its circumferential direction, the plurality of accommodating holes and the plurality of vibrator cover plates (8) correspond one to one, and the vibrator cover plates (8) are covered at one end of the accommodating holes; A plurality of driving vibrators (1), the plurality of driving vibrators (1) being located in the plurality of accommodating holes in a one-to-one correspondence, the plurality of driving vibrators (1) being electrically connected, and the plurality of driving vibrators (1) being loaded with currents of the same amplitude and phase to generate radial sound radiation; A pressure-balancing airbag (3), wherein the central ring body (2) has a central hole, the pressure-balancing airbag (3) is arranged on the inner wall of the central hole, and the gas inside the pressure-balancing airbag (3) is connected to the gas inside the plurality of driving vibrators (1), and the vibrator cover plate (8) and the pressure-balancing airbag (3) are respectively located at two ends of the driving vibrator (1).

2. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 1, characterized in that: The driving vibrator (1) comprises a radiation surface (4), a positioning rod (5), a spring (13), an upper magnetic circuit (6), a permanent magnet ring (7), a coil (9), an external magnetic circuit (10), an exciter base (11) and a central filling member (12); the external magnetic circuit (10) is fixedly arranged on the exciter base (11); the central filling member is fixedly connected to the exciter base (11); the upper magnetic circuit (6) and the permanent magnet ring (7) are both located between the external magnetic circuit (10) and the central filling member; the coil (9) is located between the upper magnetic circuit (6) and the external magnetic circuit (10); one end of the positioning rod (5) is fixedly connected to the radiation surface (4); the other end is slidably connected to the exciter base (11); and the spring (13) is sleeved on the positioning rod (5).

3. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 2, characterized in that: The positioning rod (5) is connected to the vibration exciter base (11) via a linear bearing.

4. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 2, characterized in that: A circular hole (14) is provided on the side surface of the central ring body (2), and the circular hole (14) can realize the connection between the driving vibrator (1) and the transmission cable.

5. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 2, characterized in that: A rubber membrane is provided between the driving vibrator (1) and the vibrator cover plate (8).

6. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 1, characterized in that: The vibrator cover plate (8) is provided with a plurality of first through holes.

7. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 1, characterized in that: It also comprises two side cover plates (16), both of which are fixedly connected to the central ring body (2), and the two side cover plates (16) are respectively arranged to cover the two ends of the central hole.

8. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 7, characterized in that: The side cover plate (16) is provided with a plurality of second through holes.

9. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 1, characterized in that: The central ring body (2) is fixedly provided with a handle (15).

10. The multi-element high-efficiency electrodynamic transducer with circular radiation according to claim 1, characterized in that: The pressure balancing airbag (3) is a thin-walled rubber bag.

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