CN210304435U

CN210304435U - Underwater very low frequency broadband sound source

Info

Publication number: CN210304435U
Application number: CN201921157350.3U
Authority: CN
Inventors: 符益知; 徐伟; 刘亚雄
Original assignee: Changsha Kingsignal Defense Technology Co ltd
Current assignee: Changsha Kingsignal Defense Technology Co ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-04-14
Anticipated expiration: 2029-07-23

Abstract

An underwater very low frequency broadband sound source comprising an outer housing (2); a rear baffle (1) connected with one end of the outer shell (2); a front baffle (3) connected with the other end of the outer shell (2); a press ring (5) connected with the inner wall of the outer shell (2); an air bag (4) connected with the compression ring (5); the mounting sleeve (6) is positioned between the air bag (4) and the front baffle (3) and connected with the compression ring (5); a magnet (7) connected with the mounting sleeve (6); a cylindrical magnetic circuit block (8) connected with the end of the magnet (7) close to the front baffle (3); the coil sleeve (10) is positioned on the outer side of the cylindrical magnetic circuit block (8) and the outer side of the end close to the front baffle (3); the annular magnetic circuit block (9) is positioned on the outer side of the coil sleeve (10) and connected with the mounting sleeve (6); the radiation plate (11) is positioned on one side of the coil sleeve (10) close to the front baffle (3); and a rubber sealing plate (12) connected with the radiation plate (11) and the mounting sleeve (6).

Description

Underwater very low frequency broadband sound source

Technical Field

The utility model relates to a sound wave transmission technical field especially relates to a very low frequency broadband sound source under water.

Background

With the development of modern science and technology, the world sensing mode of people is more and more diversified and precise, and the development of technologies such as sound, light, electricity, magnetism, machinery, microelectronics, quantum and the like enables a brand-new and three-dimensional information interaction world to be presented to people. At present, the information interaction in water still mainly adopts the interaction of sound signals, and in many fields of underwater sound detection, marine geological exploration, underwater target simulation and the like, a very low frequency and broadband underwater sound source is required to be provided to be used as a detection target or a test sound source for carrying out performance measurement and performance calibration on an underwater sound hydrophone and a receiving array. It generally puts the following requirements on the sound source: the working frequency band is wide, the lower limit of the frequency is as low as possible, and the upper limit of the frequency is as high as possible, such as 200 Hz-2000 Hz; the horizontal radiation is omnidirectional and has no directivity, such as fluctuation of no more than 3 dB; the sound source level of the radiation signal meets the signal-to-noise ratio required by general measurement, such as more than 160 dB; the impedance, the sending voltage or the current response is flat, and the fluctuation does not exceed 10dB, so that the broadband complex signal radiation is easy to realize; the working depth has wide application range, such as 5 m-100 m; small size, light weight, such as diameter less than 500mm and weight less than 100kg, and convenient transportation and installation.

The underwater transmitting transducer is used as a basic component for generating acoustic signals and plays a crucial role in simulating and detecting underwater targets. CN 102075828A discloses an underwater very low frequency broadband sound source in 2011, 05, 25, which comprises a transducer housing, a vibration assembly, a guide assembly, a support and seal assembly, a magnetic circuit assembly, a seal and an electrical interface; the transducer shell consists of a front section shell, a middle section shell and a rear section shell, wherein the front section shell and the middle section shell are cylindrical with two open ends, and the rear section shell is cylindrical with one open end and a cover plate at one end; the opening end parts of the front section shell, the middle section shell and the rear section shell are processed with radial O-shaped ring grooves and end-to-end sealing grooves; the two parts are rigidly connected and sealed by metal screws and O-shaped sealing rings; the supporting and sealing assembly consists of a front supporting piece, a middle supporting piece and an air bag part; the inner edge of the front support is connected with the radiation end block, and the outer edge of the front support is connected with the front section shell; the middle supporting piece is connected with the outer peripheral segment block of the magnetic circuit in the magnetic circuit assembly through screws so as to be installed and positioned; the middle supporting piece is connected with the front guide piece and the middle guide piece through screws, and the front guide piece and the middle guide piece are connected for installation and positioning; the air bag is arranged in the rear section shell of the transducer shell, and the edge of the air bag is arranged in a sealing groove between the middle section shell and the rear section shell; after the transducer is assembled in the air, the air cavity formed inside is divided into a front cavity and a rear cavity by the magnetic circuit component, and the air in the two cavities is communicated with each other.

In order to adapt to the trend of the current sonar detection technology towards low frequency development, various types of transmitting transducers such as a overflow piezoelectric transducer, a multi-mode flextensional transducer, a moving-coil transmitting transducer and the like appear in the development of underwater acoustic transmitting transducers. The overflow piezoelectric transmitting transducer needs a liquid cavity with larger volume for realizing low-frequency transmission, and is difficult to realize for the transmission of very low-frequency signals below 200 Hz; the multimode flextensional transmitting transducer also needs larger volume space for transmitting low-frequency signals; the moving-coil transmitting transducer can easily realize the radiation of low-frequency and very-low-frequency complex broadband signals according to the working principle, and the volume of the moving-coil transmitting transducer is mainly influenced by the working depth and hydrostatic pressure balance mode. The traditional passive gas compensation mode is characterized in that an external air bag is used for pressure compensation, so that the air pressure in the moving coil is consistent with the hydrostatic pressure outside the moving coil, the mode is simple and easy to implement, but the volume of the external air bag is greatly increased when the working water depth of 100m is met, and the miniaturization development of a sound source is not facilitated. The active gas compensation mode is mainly characterized in that the pressure sensor is utilized to monitor the external pressure of the moving coil, and meanwhile, the circuit controls the high-pressure gas storage tank to compensate the pressure, so that the complexity of a sound source system can be increased, and the development of the sound source system which is not beneficial to miniaturization and multiple application platforms is facilitated. The hydraulic balance device is generally filled with liquid to achieve pressure balance, and the mode has certain influence on the acoustic characteristic of a sound source, so the hydraulic balance device is generally used less in a working depth range of 5-100 m.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to solve the technical problem of providing a small-size very low frequency broadband sound source.

In order to solve the technical problem, the utility model provides an underwater very low frequency broadband sound source, which comprises an outer shell; a tailgate connected to one end of the outer shell; the front baffle is connected with the other end of the outer shell; the compression ring is connected with the inner wall of the outer shell; the air bag is connected with the compression ring; the mounting sleeve is positioned between the air bag and the front baffle and connected with the compression ring; the magnet is connected with the mounting sleeve; the cylindrical magnetic circuit block is connected with the end, close to the front baffle, of the magnet; the coil sleeve is positioned on the outer side of the cylindrical magnetic circuit block and the outer side of the end close to the front baffle plate; the annular magnetic circuit block is positioned outside the coil sleeve and connected with the mounting sleeve; the radiation plate is positioned on one side of the coil sleeve close to the front baffle; and the rubber sealing plate is connected with the radiation plate and the mounting sleeve.

As a further improvement of the utility model, the utility model provides an underwater very low frequency broadband sound source, the clamping ring has the U type ring groove that supplies the installation gasbag, the gasbag have with U type ring groove matched with annular boss.

As a further improvement of the utility model, the utility model provides an underwater very low frequency broadband sound source, the coil cover is connected with annular magnetic circuit piece through two shell fragments.

The utility model provides a technical scheme, the vacant part in the cavity that installation cover and rubber seal board constitute is the cavity part promptly. Because the volume of the cavity is reduced to the utmost extent through design, the structural requirement of vibration is just met, and theoretically, the volume requirement of the air bag is in direct proportion to the volume of the cavity by N times, the volume of the air bag is greatly reduced, and the whole volume is greatly reduced.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this application, illustrating embodiments of the invention and description thereof for the purpose of explanation and are not intended to constitute an undue limitation on the invention. In the drawings:

FIG. 1 is a schematic diagram of an embodiment underwater very low frequency broadband sound source;

FIG. 2 is a schematic view of the structure of FIG. 1 along the line A-A;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic structural view of a vibrating portion in the embodiment;

FIG. 5 is a schematic cross-sectional view of FIG. 4;

FIG. 6 is a schematic structural view of a balloon portion in the embodiment;

fig. 7 is a schematic diagram of the cross-sectional structure of fig. 6.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1 to 7, the underwater very low frequency broadband sound source at least includes an outer shell 2, a rear baffle 1 connected to one end of the outer shell 2, a front baffle 3 connected to the other end of the outer shell 2, a pressure ring 5 connected to an inner wall of the outer shell 2, an air bag 4 connected to the pressure ring 5, a mounting sleeve 6 located between the air bag 4 and the front baffle 3 and connected to the pressure ring 5, a magnet 7 connected to the mounting sleeve 6, a cylindrical magnetic circuit block 8 connected to a end of the magnet 7 near the front baffle 3, a coil sleeve 10 located outside the cylindrical magnetic circuit block 8 and outside a end of the front baffle 3, an annular magnetic circuit block 9 located outside the coil sleeve 10 and connected to the mounting sleeve 6, a radiation plate 11 located on a side of the coil sleeve 10 near the front baffle 3, and a rubber sealing plate 12 connected to the radiation plate 11 and the mounting sleeve 6.

On the basis of above-mentioned scheme, optionally, the utility model provides a very low frequency broadband sound source under water, clamping ring 5 have the U type annular that supplies installation gasbag 4, and gasbag 4 has the annular boss with U type annular matched with.

On the basis of above-mentioned scheme, optionally, the utility model provides an underwater very low frequency broadband sound source, coil cover 10 are connected with annular magnetic circuit piece 9 through two shell fragments 13.

The utility model provides a technical scheme, installation cover 6, cylindricality magnetic circuit piece 8, magnet 7, annular magnetic circuit piece 9 form the magnetic circuit, and after the coil led to the alternating current, coil cover 10 drove radiation plate 11 and is up-and-down motion. The coil sleeve 10 is fixed on the annular magnetic circuit block 9 through two elastic sheets 13, and the elastic sheets 13 provide restoring force; the rubber sealing plate 12 is sealed by the inner pressure ring 14 and the outer pressure ring 15: the radiation plate 11 is pressed through an inner pressure ring 14, and the outer ring is pressed on the mounting sleeve 6 through an outer pressure ring 15; the air bag 4 is connected with the mounting sleeve 6 in a sealing way. The blank part in the cavity formed by the mounting sleeve 6 and the rubber sealing plate 12 is the cavity part. Because the volume of the cavity is reduced to the utmost extent through design, the structural requirement of vibration is just met, theoretically, the volume requirement of the air bag is in direct proportion to the volume of the cavity by N times (the N value is determined by the design use depth), so that the volume of the air bag is greatly reduced, and the whole volume is greatly reduced.

Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An underwater very low frequency broadband sound source, characterized by comprising an outer shell (2); a rear baffle (1) connected with one end of the outer shell (2); the front baffle (3) is connected with the other end of the outer shell (2); the compression ring (5) is connected with the inner wall of the outer shell (2); the air bag (4) is connected with the compression ring (5); the mounting sleeve (6) is positioned between the air bag (4) and the front baffle (3) and connected with the compression ring (5); a magnet (7) connected with the mounting sleeve (6); the cylindrical magnetic circuit block (8) is connected with the end, close to the front baffle (3), of the magnet (7); the coil sleeve (10) is positioned on the outer side of the cylindrical magnetic circuit block (8) and the outer side of the end close to the front baffle (3); the annular magnetic circuit block (9) is positioned on the outer side of the coil sleeve (10) and connected with the mounting sleeve (6); the radiation plate (11) is positioned on one side of the coil sleeve (10) close to the front baffle (3); and the rubber sealing plate (12) is connected with the radiation plate (11) and the mounting sleeve (6).

2. An underwater very low frequency broadband sound source according to claim 1, characterized in that the pressure ring (5) has a U-shaped ring groove for mounting the balloon (4), the balloon (4) having an annular boss cooperating with the U-shaped ring groove.

3. An underwater very low frequency broadband sound source according to claim 1, characterized in that the coil housing (10) is connected to the annular magnetic circuit block (9) by means of two spring plates (13).