Electromagnetic underwater sound source with conical shell

Abstract

The invention provides an electromagnetic underwater sound source with a conical shell. The underwater sound source comprises an electromagnetic drive composed of a longitudinal magnetic conductive iron core and a coil, the conical metal shell used for generating ultralow-frequency vibration, and an annular metal spring used for fixing and connecting the conical shell and providing rigidity and watertightness of a vibration system. According to the conical shell electromagnetic underwater sound source, ultralow-frequency underwater driving is constructed by adopting longitudinal electromagnetic driving, and large driving force and vibration displacement are provided for the sound source; longitudinal electromagnetic driving is adopted for excitation in the center of the conical shell, and center supporting bending vibration is applied to achieve miniaturization of an ultra-low-frequency underwater sound source.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater acoustic transducers, and in particular to a conical shell electromagnetic underwater sound source. The underwater sound source has the characteristics of ultra-low frequency, high power and high efficiency, and can be used as an ultra-low frequency sound source capable of emitting ultra-low frequency sound waves underwater and applied to ocean detection and communication equipment. Background Art

[0002] Low-frequency sound waves, especially ultra-low-frequency sound waves with a frequency below 100Hz, have a very huge utilization value. When sound waves propagate in water, the lower the frequency of the sound waves, the less attenuation. Therefore, ultra-low-frequency sound waves can propagate over long distances in water, which is conducive to increasing the effective distance of sonar and underwater acoustic communication equipment. In the civilian field, ultra-low-frequency sound waves are also widely used in the fields of ocean acoustic tomography and geoacoustic research.

[0003] The generation of ultra-low frequency sound waves in water depends on ultra-low frequency underwater acoustic transducers. Generally speaking, the lower the frequency of the transducer, the larger the size and weight. If the transducer made of traditional driving materials such as piezoelectric materials and magnetostrictive materials is to achieve ultra-low frequency emission, its size and weight are very large. Electromagnetic drive is an ideal ultra-low frequency transducer driving source. Its basic principle is based on electromagnetic interaction, and it has the characteristics of large vibration displacement and large driving force, which just meets the requirements of ultra-low frequency sound source for large driving vibration displacement. At the same time, electromagnetic drive is combined with bending vibration mode, and the bending vibration mode can achieve the characteristics of small-sized low-frequency vibration, thereby further reducing the working frequency of the sound source. Based on this, it is very suitable to construct an ultra-low frequency underwater sound source based on electromagnetic drive. Based on the above requirements, an ultra-low frequency underwater sound source based on a conical shell structure and using electromagnetic drive to provide the driving force of the sound source is proposed. The electromagnetic drive pair of the sound source adopts a longitudinal arrangement structure, and the electromagnetic drive stack is used to excite the central part of the conical shell, so as to realize the bending vibration of the conical shell to emit ultra-low frequency sound waves into the water. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of large volume and weight of existing ultra-low frequency sound sources, and to propose a conical shell electromagnetic underwater sound source. The underwater sound source generates electromagnetic force based on a longitudinal electromagnetic drive stack, and the drive stack excites the conical metal shell to achieve ultra-low frequency sound wave emission. The sound source has the characteristics of ultra-low frequency and compact structure.

[0005] The present invention is realized by the following technical scheme. The present invention proposes a conical shell electromagnetic underwater sound source, which includes an electromagnetic drive composed of a longitudinal magnetic conductive core and a coil, a conical metal shell for generating ultra-low frequency vibration, and a circular metal spring for fixing and connecting the conical shell and providing stiffness and watertightness of the vibration system;

[0006] The electromagnetic driven magnetic core is a coaxial cylindrical shape with an E-shaped cross section; and the magnetic core is slit.

[0007] Furthermore, the coil is composed of a coil frame and a wire wound thereon, the coil frame is constructed of an epoxy resin board, and is watertightly potted with potting epoxy to ensure insulation.

[0008] Furthermore, the electromagnetic drive is composed of two magnetic conductive cores and two coils arranged longitudinally; when current flows through the two coils in the drive, the electromagnetic drive generates an electromagnetic adsorption force.

[0009] Furthermore, the conical metal shell is made of aluminum alloy, and the apex of the cone is a plane structure with a cavity; the working frequency of the underwater sound source is adjusted by adjusting the maximum radius of the conical metal shell; the underwater sound source adopts two conical metal shells placed opposite to each other and ensuring a certain gap.

[0010] Furthermore, the annular metal spring connects the two conical metal shells by welding, which provides elastic stiffness to the system and prevents water from entering the interior of the sound source to achieve a watertight effect.

[0011] The present invention has the following beneficial effects:

[0012] The conical shell electromagnetic underwater sound source described in the present invention adopts longitudinal electromagnetic drive to construct an ultra-low frequency underwater drive, which provides a large driving force and vibration displacement for the sound source; the longitudinal electromagnetic drive is used to excite the center of the conical shell, and the central support bending vibration is applied to realize the miniaturization of the ultra-low frequency underwater sound source. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the basic model of the longitudinally arranged electromagnetic drive magnetic circuit of the present invention;

[0014] Figure 2 It is a schematic diagram of the magnetic conductive magnetic circuit and the magnetic circuit slit according to the present invention;

[0015] Figure 3 A schematic diagram of a coil skeleton according to the present invention;

[0016] Figure 4 It is a cross-sectional view of the metal conical shell of the present invention;

[0017] Figure 5 It is a cross-sectional view of the assembly of the conical housing and the magnetic conductive magnetic circuit of the present invention;

[0018] Figure 6 A schematic diagram of a conical shell electromagnetic underwater sound source according to the present invention;

[0019] Figure 7It is a cross-sectional view of the conical shell electromagnetic underwater sound source of the present invention;

[0020] Explanation of the reference numerals in the figure: 1-magnetic core, 2-coil, 3-core slit, 4-coil skeleton, 5-conical metal shell, 6-positioning hole, 7-bonding hole, 8-metal spring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 7 The present invention proposes a conical shell electromagnetic underwater sound source, which includes an electromagnetic drive composed of a longitudinal magnetic conductive core and a coil, a conical metal shell for generating ultra-low frequency vibration, and a circular metal spring for fixing and connecting the conical shell and providing stiffness and watertightness of the vibration system;

[0023] The electromagnetic driven magnetic core is a coaxial cylindrical shape with an E-shaped cross section. In order to reduce eddy current loss, the magnetic core is slit, which improves the uniformity and strength of the magnetic field in the magnetic gap of the driving stack and improves the working efficiency of the driving stack.

[0024] The coil consists of a coil frame and a wire wound on it. The coil frame is constructed of an epoxy resin board and is watertightly potted with potting epoxy to ensure insulation.

[0025] The electromagnetic drive is composed of two magnetic conductive cores and two coils arranged longitudinally; when current flows through the two coils in the drive, the electromagnetic drive generates electromagnetic adsorption force.

[0026] The conical metal shell is made of aluminum alloy, and the apex of the cone is a plane structure with a cavity; the working frequency of the underwater sound source is adjusted by adjusting the maximum radius of the conical metal shell; the underwater sound source adopts two conical metal shells placed opposite to each other and ensure a certain gap.

[0027] The annular metal spring connects two conical metal shells by welding, which provides elastic stiffness to the system and prevents water from entering the sound source to achieve watertightness.

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Figure 1It is a schematic diagram of the electromagnetic drive magnetic circuit model of the present invention, including a permeable core 1 and a coil 2. There is an air gap in the middle of the electromagnetic drive, and when current passes through the coil, the two sides of the electromagnetic drive attract each other.

[0030] Figure 2 It is a schematic diagram of the permeable core 1 and the core slit 3 in the present invention. The core slit 3 is to reduce the eddy current loss in the core. Since the eddy current always flows on the surface of the conductor, the surface area of ​​the core becomes larger after the slit is cut, resulting in a longer eddy current flow path, an increased eddy current flow resistance, and a reduced loss. In theory, the more slits there are, the better the eddy current suppression effect.

[0031] Figure 3 Schematic diagram of the coil frame 4 in the present invention. The coil frame is constructed of epoxy resin board to make the watertight effect of the potting solution more reliable.

[0032] Figure 4 It is a cross-sectional schematic diagram of the conical metal shell 5 in the present invention. The conical metal shell is made of aluminum alloy. The middle positioning hole 6 is used to cooperate with the clamp for positioning, and the bonding hole 7 is used to install the electromagnetic drive magnetic circuit.

[0033] Figure 5 It is a schematic cross-sectional view of the combination of the conical metal shell 5 and the magnetic conductive core 1 of the present invention. The magnetic conductive core 1 is inserted into the bonding hole 7 and bonded with epoxy resin.

[0034] Figure 6 is a schematic diagram of a conical shell electromagnetic underwater sound source of the present invention, Figure 7 The metal spring 8 is used to connect the upper and lower conical metal shells 5 containing the magnetic conductive core 1, and is connected to the conical metal shell 5 by epoxy bonding. The two coils 2 are connected in series in the circuit, and the two sub-drive stacks are connected in parallel in the circuit.

[0035] The above only expresses the preferred implementation mode of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A conical shell electromagnetic underwater sound source, characterized in that: The underwater sound source includes an electromagnetic drive composed of a longitudinal magnetic conductive core and a coil, a conical metal shell for generating ultra-low frequency vibration, and a circular metal spring for fixing and connecting the conical shell and providing stiffness and watertightness of the vibration system; The electromagnetic driven magnetic core is a coaxial cylindrical shape with an E-shaped cross section; and the magnetic core is slit.

2. The underwater sound source according to claim 1, characterized in that: The coil consists of a coil frame and a wire wound on it. The coil frame is constructed of an epoxy resin board and is watertightly potted with potting epoxy to ensure insulation.

3. The underwater sound source according to claim 1, characterized in that: The electromagnetic drive is composed of two magnetic conductive cores and two coils arranged longitudinally; when current flows through the two coils in the drive, the electromagnetic drive generates electromagnetic adsorption force.

4. The underwater sound source according to claim 1, characterized in that: The conical metal shell is made of aluminum alloy, and the apex of the cone is a plane structure with a cavity; the working frequency of the underwater sound source is adjusted by adjusting the maximum radius of the conical metal shell; the underwater sound source adopts two conical metal shells placed opposite to each other and ensure a certain gap.

5. The underwater sound source according to claim 4, characterized in that: The annular metal spring connects two conical metal shells by welding, which provides elastic stiffness to the system and prevents water from entering the sound source to achieve watertightness.

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