Multi-plate and shell flexural transducer

Abstract

The present invention provides a multi-plate shell flextensional transducer related to the fields of underwater acoustic detection, marine engineering and speaker technology, comprising a sound radiation shell and a functional material driving body, wherein the functional material driving body is connected to the inner cavity of the sound radiation shell; the sound radiation shell comprises a primary sound radiation plate, a secondary sound radiation plate, an upper end cover of the sound radiation shell and a lower end cover of the sound radiation shell, wherein the primary sound radiation plate and the secondary sound radiation plate are respectively located between the upper end cover of the sound radiation shell and the lower end cover of the sound radiation shell, and the primary sound radiation plate and the secondary sound radiation plate are arranged alternately; when the functional material driving body is working, the upper end cover of the sound radiation shell and the lower end cover of the sound radiation shell are pushed to vibrate, thereby driving the primary sound radiation plate and the secondary sound radiation plate to bend and deform to generate low-frequency sound waves. The present invention can obtain a flextensional transducer with a wider working frequency band, stronger low-frequency emission capability, deeper underwater working depth, smaller volume, weight and linearity.

Description

Technical Field

[0001] The invention relates to the technical fields of underwater acoustic detection, marine engineering and loudspeaker, and in particular to a multi-plate shell flextensional transducer. Background Art

[0002] In underwater acoustic detection, in order to increase the detection distance, low-frequency and high-power transmitting transducers are generally selected as active detection sound transmitters. Flextensional transducers use the bending vibration of plates and shells to generate low-frequency sound waves, and have the advantages of small size and high-power transmission, which is very suitable for long-distance underwater sound wave detection. For low-frequency transmitting transducers, it is usually hoped that their working bandwidth is sufficiently wide, the size and weight are small, and the sound field distribution is relatively uniform in the whole space. However, although the size of traditional flextensional transducers is small, the working bandwidth is not wide enough. In addition, for conventional flextensional transducers, when the working frequency reaches one octave, the distribution of sound radiation energy in space often has obvious directionality. In addition, there is a common problem that the working performance of low-frequency and small-sized underwater acoustic transducers changes sensitively with the underwater working depth. The above problems limit the application scope and applicable environment of low-frequency and small-sized sound sources. In view of this, the present invention proposes a new flextensional transducer based on multi-plate and shell sound radiation. This new flextensional transducer can significantly improve these problems faced by small-sized sound sources. At the same time, due to its own characteristics, it can also be used as a good speaker in the air.

[0003] Through the search of prior art patent documents, it is found that the Chinese invention patent publication number is CN103646643B, which discloses a flexural transducer using PVDF piezoelectric film, which belongs to the field of underwater acoustic detection technology and has the characteristics of low frequency, broadband, high receiving sensitivity, high-power sound radiation and horizontal omnidirectional directivity. It includes a piezoelectric ceramic chip stack and a PVDF film, the PVDF film surrounds the piezoelectric ceramic chip stack, and a connector is provided between the PVDF film and the piezoelectric ceramic chip stack, and further includes a device for prestressing the PVDF film. The present invention uses PVDF film to replace the metal shell of the traditional flexural transducer, and uses PVDF film and piezoelectric crystal stack as sensitive elements. The vibration of the PVDF film adopts the bending vibration mode of the film under the simply supported boundary condition, and the vibration of the piezoelectric crystal stack adopts the longitudinal vibration mode. A higher bandwidth can be obtained through modal coupling to realize broadband emission of sound waves. The present invention provides a multi-plate shell flexural transducer to solve the problems of insufficient working bandwidth, limited application scope and applicable environment. Therefore, the method introduced in this document and the present invention belongs to different inventive concepts. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a multi-plate shell flextensional transducer.

[0005] A multi-plate shell flextensional transducer provided by the present invention comprises a sound radiation shell and a functional material driver, wherein the functional material driver is connected to the inner cavity of the sound radiation shell;

[0006] The sound radiation shell includes a primary sound radiation plate, a secondary sound radiation plate, an upper end cover of the sound radiation shell and a lower end cover of the sound radiation shell, the primary sound radiation plate and the secondary sound radiation plate are respectively located between the upper end cover of the sound radiation shell and the lower end cover of the sound radiation shell, and the primary sound radiation plate and the secondary sound radiation plate are alternately arranged;

[0007] When the functional material driving body is working, it pushes the upper end cover and the lower end cover of the sound radiation shell to vibrate, thereby driving the first-level sound radiation plate and the second-level sound radiation plate to bend and deform, thereby generating low-frequency sound waves.

[0008] In some embodiments, the primary sound radiation plate is connected to the outer sides of the upper end cover of the sound radiation shell and the lower end cover of the sound radiation shell, and the secondary sound radiation plate is connected to the inner sides of the upper end cover of the sound radiation shell and the lower end cover of the sound radiation shell;

[0009] Alternatively, the secondary sound radiation plate is connected to the outer sides of the upper end cover of the sound radiation shell and the lower end cover of the sound radiation shell, and the primary sound radiation plate is connected to the inner sides of the upper end cover of the sound radiation shell and the lower end cover of the sound radiation shell;

[0010] The primary sound radiation panel and the secondary sound radiation panel are driven to be arranged in a staggered manner inside and outside.

[0011] In some embodiments, the primary sound radiation panels and the secondary sound radiation panels are alternately arranged in a circular ring or polygonal shape between the upper end cover and the lower end cover of the sound radiation shell.

[0012] In some embodiments, the functional material driving body includes an upper cover plate, a lower cover plate and a functional material driving rod, and the upper cover plate and the lower cover plate are respectively connected to the upper and lower sides of the functional material driving rod.

[0013] In some embodiments, the functional material driving body upper cover plate has screw threads on the outer surface, and the screw threads match the threaded holes of the upper end cover of the sound radiation shell;

[0014] The upper cover plate of the functional material driving body is screwed into the upper end cover of the sound radiation shell through the threaded hole.

[0015] In some embodiments, the functional material driving body upper cover plate is provided with evenly distributed signal line threading holes, and the number of the signal line threading holes is greater than or equal to 2.

[0016] In some embodiments, the diameter of the signal line threading hole is 1 mm.

[0017] In some embodiments, the lower cover plate of the functional material driving body is in the shape of a frustum, and the frustum of the lower cover plate of the functional material driving body matches the through hole of the lower end cover of the sound radiation shell;

[0018] The lower cover plate of the functional material driving body is coated with glue and fixed in the through hole of the lower end cover of the sound radiation shell.

[0019] In some embodiments, the diameter of the through hole of the lower end cover of the sound radiation shell is 0.1 mm larger than the diameter of the lower cover plate of the functional material driving body.

[0020] In some embodiments, the bending radius, wall thickness, width and material of the primary sound radiation panel and the secondary sound radiation panel are the same or different.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention can increase the number of low-frequency resonance peaks of the flextensional transducer by staggered arrangement of the primary sound radiation plates and the secondary sound radiation plates, thereby increasing the working bandwidth and enhancing the overall low-frequency emission capability within the working frequency band; the connection between the sound radiation shell and the functional material driver increases the working depth range of the flextensional transducer, reduces the volume and weight of the low-frequency broadband transducer, and thus reduces the manufacturing cost of the low-frequency broadband transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 It is a schematic diagram of the structure of the multi-plate shell flexural transducer in the present invention;

[0025] Figure 2 is a longitudinal cross-sectional view of a housing of a multi-plate shell flextensional transducer in the present invention;

[0026] Figure 3 is a radial cross-sectional view of the shell of the multi-plate shell flextensional transducer in the present invention;

[0027] Figure 4 It is a comparison of the emission voltage response of the multi-plate shell flextensional transducer in the present invention and the traditional flextensional transducer;

[0028] Figure 5 It is the axial radiation directivity diagram of the multi-plate shell flextensional transducer at 550Hz in the present invention;

[0029] Figure 6 This is the 1450Hz axial radiation directivity diagram of the multi-plate shell flextensional transducer in the present invention.

[0030] Numbers in the figure:

[0031] Sound radiation shell 100, primary sound radiation plate 1, secondary sound radiation plate 2, upper end cover 3 of sound radiation shell, lower end cover 4 of sound radiation shell, functional material driving body 200, upper cover plate 21 of functional material driving body, lower cover plate 22 of functional material driving body, and functional material driving rod 23. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] Example

[0034] According to a multi-plate shell flexural transducer provided by the present invention, Figure 1-3 As shown, it includes a sound radiation shell 100 and a functional material driving body 200, and the functional material driving body 200 is connected to the inner cavity of the sound radiation shell 100;

[0035] The sound radiation shell 100 includes a primary sound radiation plate 1, a secondary sound radiation plate 2, an upper end cover 3 of the sound radiation shell, and a lower end cover 4 of the sound radiation shell. The primary sound radiation plate 1 and the secondary sound radiation plate 2 are alternately arranged in a circular ring or polygonal shape between the upper end cover 3 of the sound radiation shell and the lower end cover 4 of the sound radiation shell. The primary sound radiation plate 1 is connected to the outer side of the upper end cover 3 of the sound radiation shell and the lower end cover 4 of the sound radiation shell, and the secondary sound radiation plate 2 is connected to the inner side of the upper end cover 3 of the sound radiation shell and the lower end cover 4 of the sound radiation shell; the primary sound radiation plate 1 and the secondary sound radiation plate 2 are driven to be arranged inside and outside in a staggered manner.

[0036] The functional material driver 200 includes an upper cover plate 21 of the functional material driver, a lower cover plate 22 of the functional material driver, and a functional material driver rod 23, wherein the upper cover plate 21 of the functional material driver and the lower cover plate 22 of the functional material driver are respectively connected to the upper and lower sides of the functional material driver rod 23. The upper cover plate 21 of the functional material driver has screw threads on its outer extension, and the screw threads match the threaded holes of the upper end cover 3 of the sound radiation shell. The upper cover plate 21 of the functional material driver has two evenly distributed signal line threading holes, and the diameter of the signal line threading holes is 1 mm. The lower cover plate 22 of the functional material driver is in the shape of a truncated cone, and the truncated cone of the lower cover plate 22 of the functional material driver matches the through hole of the lower end cover 4 of the sound radiation shell; the through hole diameter of the lower end cover 4 of the sound radiation shell is 0.1 mm larger than the diameter of the lower cover plate 22 of the functional material driver. The lower cover plate 22 of the functional material driving body is coated with 618 epoxy glue and fixed in the through hole of the lower end cover 4 of the sound radiation shell. Then, the upper cover plate 21 of the functional material driving body is screwed into the upper end cover 3 of the sound radiation shell through the threaded hole.

[0037] Working principle: When the functional material driving rod 23 is powered on, the upper cover plate 21 of the functional material driving body and the lower cover plate 22 of the functional material driving body respectively push the upper end cover 3 of the sound radiation shell and the lower end cover 4 of the sound radiation shell to vibrate, thereby driving the first-level sound radiation plate 1 and the second-level sound radiation plate 2 to bend and deform, thereby generating low-frequency sound waves.

[0038] More specifically, the functional material driving rod 23 is made of p8 or p4 piezoelectric functional material. The first-level sound radiation plate 1 uses 8 pieces of LY12 aluminum with a bending radius of 600mm and a wall thickness of 3mm; the second-level sound radiation plate 2 uses 8 pieces of 60Si2Mn steel with a bending radius of 300mm and a wall thickness of 5mm. As a result, the multi-plate shell flexural transducer has a diameter of 100mm, a height of 280mm, and a weight of 4kg. Figure 4-6 As shown, the present invention is set as a new type of flextensional transducer, from 550HZ-1450HZ, the radiation direction covers a wide range, and the emission voltage response curve is higher than that of the classic flextensional transducer. The present invention can broaden the working frequency band of the flextensional transducer, increase the low-frequency emission capability of the flextensional transducer, reduce the size and weight of the low-frequency broadband transducer, and increase the underwater working depth of the flextensional transducer, so that the production cost of the low-frequency broadband transducer is greatly reduced.

[0039] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A multi-plate shell flexural transducer, characterized in that: It comprises a sound radiation shell (100) and a functional material driver (200), wherein the functional material driver (200) is connected to the inner cavity of the sound radiation shell (100); The sound radiation shell (100) comprises a primary sound radiation plate (1), a secondary sound radiation plate (2), an upper end cover (3) of the sound radiation shell, and a lower end cover (4) of the sound radiation shell, wherein the primary sound radiation plate (1) and the secondary sound radiation plate (2) are respectively located between the upper end cover (3) of the sound radiation shell and the lower end cover (4) of the sound radiation shell, and the primary sound radiation plate (1) and the secondary sound radiation plate (2) are arranged alternately; When the functional material driving body (200) is working, it pushes the upper end cover (3) of the sound radiation shell and the lower end cover (4) of the sound radiation shell to vibrate, thereby driving the first-level sound radiation plate (1) and the second-level sound radiation plate (2) to bend and deform, thereby generating low-frequency sound waves.

2. The multi-plate shell flextensional transducer according to claim 1, characterized in that: The primary sound radiation plate (1) is connected to the outer sides of the upper end cover (3) of the sound radiation shell and the lower end cover (4) of the sound radiation shell, and the secondary sound radiation plate (2) is connected to the inner sides of the upper end cover (3) of the sound radiation shell and the lower end cover (4) of the sound radiation shell; Alternatively, the secondary sound radiation plate (2) is connected to the outer sides of the upper end cover (3) of the sound radiation shell and the lower end cover (4) of the sound radiation shell, and the primary sound radiation plate (1) is connected to the inner sides of the upper end cover (3) of the sound radiation shell and the lower end cover (4) of the sound radiation shell; The primary sound radiation panel (1) and the secondary sound radiation panel (2) are driven to be arranged in a staggered manner inside and outside.

3. The multi-plate shell flextensional transducer according to claim 2, characterized in that: The primary sound radiation panels (1) and the secondary sound radiation panels (2) are alternately arranged in a circular ring or polygonal shape between the upper end cover (3) of the sound radiation shell and the lower end cover (4) of the sound radiation shell.

4. The multi-plate shell flextensional transducer according to claim 3, characterized in that: The functional material driving body (200) comprises a functional material driving body upper cover plate (21), a functional material driving body lower cover plate (22) and a functional material driving rod (23); the functional material driving body upper cover plate (21) and the functional material driving body lower cover plate (22) are respectively connected to the upper and lower sides of the functional material driving rod (23).

5. The multi-plate shell flextensional transducer according to claim 4, characterized in that: The functional material driving body upper cover plate (21) has screw threads on the outside, and the screw threads match the threaded holes of the upper end cover (3) of the sound radiation shell; The functional material driving body upper cover plate (21) is screwed into the sound radiation shell upper end cover (3) through the threaded hole.

6. The multi-plate shell flextensional transducer according to claim 5, characterized in that: The functional material driving body upper cover plate (21) is provided with evenly distributed signal line threading holes, and the number of the signal line threading holes is greater than or equal to 2.

7. The multi-plate shell flextensional transducer according to claim 6, characterized in that: The diameter of the signal line threading hole is 1 mm.

8. The multi-plate shell flextensional transducer according to claim 4, characterized in that: The functional material driving body lower cover plate (22) is in the shape of a truncated cone, and the truncated cone of the functional material driving body lower cover plate (22) matches the through hole of the lower end cover (4) of the sound radiation shell; The functional material driving body lower cover plate (22) is glued and fixed in the through hole of the lower end cover (4) of the sound radiation shell.

9. The multi-plate shell flextensional transducer according to claim 8, characterized in that: The diameter of the through hole of the lower end cover (4) of the sound radiation shell is 0.1 mm larger than the diameter of the lower cover plate (22) of the functional material driving body.

10. The multi-plate shell flextensional transducer according to claim 1, characterized in that: The bending radius, wall thickness, width and material of the primary sound radiation plate (1) and the secondary sound radiation plate (2) are the same or different.

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