A magnetically concentrated flat-plate transducer based on the Boomer principle

Abstract

The present invention discloses a magnetically concentrated flat-plate transducer based on the Boomer principle. The transducer comprises an outer shell with a sealing cover on top. The outer shell has a coil positioner, a concentrator positioner, a powered coil, and a magnetic field concentrator located at the bottom inner portion of the shell. The magnetic field concentrator has radial slots extending from the center outward, and the magnetic field concentrator has a trapezoidal cross-section from the powered coil to the sealing cover. The side of the trapezoidal cross-section facing the powered coil is larger than the side facing the vibrating plate. The device provided by the present invention can improve the electromagnetic sound generation performance of the transducer, optimize its spectrum modulation capabilities, and thus enhance its application in ocean exploration and communications.

Description

Technical Field

[0001] The present invention belongs to the technical field of seabed topography detection, and in particular relates to a magnetic concentrated flat-plate transducer based on the Boomer principle. Background Art

[0002] With the rapid development of marine science and technology, the demand for efficient detection technologies is increasing in fields such as seabed resource exploration, underwater target detection, and marine communications. Traditionally, detection in these areas relies primarily on acoustic wave transmission, and the transmission and reception of acoustic waves rely on various transducers. As a bridge between electrical energy and acoustic energy, the performance of transducers directly determines the quality and propagation of acoustic waves.

[0003] Existing electromagnetic transducers often face a number of practical challenges. First, their generally low transmission power makes them ineffective for long-distance detection and difficult to meet the requirements of high-sensitivity detection. Second, traditional transducers have fixed spectral characteristics, lacking flexibility and unable to adjust their frequency to meet the requirements of different detection tasks. For example, in ocean exploration, the properties of targets and environmental conditions vary greatly, requiring transducers with adjustable spectral characteristics to adapt to different sound wave propagation requirements.

[0004] Furthermore, conventional transducers are typically bulky and heavy, making deployment and operation difficult in complex underwater environments. These larger devices not only increase the overall weight of the system but also limit their potential for use in confined spaces. More importantly, existing transducers are generally inefficient in terms of energy utilization, failing to fully utilize the electromagnetic field, thus limiting overall system performance.

[0005] Patent document CN112289290A discloses a membrane electromagnetic transducer, comprising a cylinder forming a watertight space, two membrane radiating elements, and a sealing element; the membrane radiating element is formed by interconnecting a cylindrical portion and an annular portion, and the height of the cylindrical portion is greater than the height of the annular portion; a partition is fixedly provided on the inner wall of the cylinder, and an excitation structure with a drive coil wound thereon is fixedly provided on both side surfaces of the partition, and an armature is fixedly provided on the end surface of the cylindrical portion facing the partition, and the armature and the excitation structure located in the same subspace are arranged relative to each other in the axial direction of the cylinder; the membrane electromagnetic transducer also includes K first fixing elements, K≥3, which fix the edge portion of the membrane radiating element to the cylinder; a reinforcement element is provided on the outer end surface of each membrane radiating element, and the reinforcement element is arranged along the radial direction of the outer end surface of the membrane radiating element and / or the reinforcement element is a symmetrical structure with the center of the outer end surface of the membrane radiating element as the center, and the reinforcement element is fixedly connected to the membrane radiating element or is an integral structure.

[0006] Patent document CN118539700A discloses a planar electromagnetic transducer, an energy collection device and an energy collection method. The planar electromagnetic transducer includes an electromagnetic module, including a shell, a coil group, a magnet group and a magnet frame, and a clamping strip is provided on the top of the magnet frame; a starting module includes a pressing block and a first wedge-shaped slider and a second wedge-shaped slider abutting against the two ends of the pressing block; a spring module includes a spring, and the magnet frame can abut against the spring and put the spring in a compressed state; a first torsion member and a second torsion member are provided inside the shell. By arranging the pressing block, the first wedge-shaped slider, the second wedge-shaped slider, the first torsion member, the second torsion member, the spring and the clamping strip, when the pressing block is subjected to downward pressure, the vertical displacement energy of the pressing block is converted into the lateral displacement of the first wedge-shaped slider and the second wedge-shaped slider, and the instantaneous impact kinetic energy is converted into the elastic potential energy of the first torsion member and the second torsion member through the starting module, thereby realizing pre-charging of potential energy and avoiding energy waste. Summary of the Invention

[0007] The object of the present invention is to provide a magnetically concentrated flat-plate transducer based on the Boomer principle, which can effectively enhance the radiation capability of sound waves when performing low-frequency excitation tasks.

[0008] To achieve the purpose of the present invention, the following technical solution is provided: a magnetically concentrated flat-plate transducer based on the Boomer principle, comprising an outer shell with a sealing cover on the top, a coil positioner, a concentrator positioner, an energized coil, and a magnetic field concentrator provided on the bottom of the outer shell;

[0009] The coil positioner is used to support the wound energized coil and is located at the bottom of the outer shell;

[0010] The concentrator positioner is used to suspend the magnetic field concentrator above the energized coil to ensure that there is a gap between the suspended magnetic field concentrator and the energized coil;

[0011] The opening ends of the outer shell corresponding to the sealing cover are provided with a vibration plate positioner for setting up the vibration plate above the magnetic field concentrator;

[0012] The magnetic field concentrator is provided with radial opening slots extending from the center outward. The cross section of the magnetic field concentrator along the direction from the energized coil to the sealing cover is a trapezoidal cross section, and the side of the trapezoidal cross section facing the energized coil is larger than the side of the trapezoidal cross section facing the vibration plate.

[0013] The present invention optimizes the magnetic field shape of the energized coil by arranging a magnetic field concentrator between the energized coil and the vibration plate. At the same time, the magnetic field concentrator is utilized to radially slot outward from the center, thereby interrupting the eddy current path and converging the current on the lower surface on the upper surface, thereby optimizing the magnetic field concentration efficiency generated by the magnetic field concentrator on the coil, thereby maximizing the utilization of the magnetic field energy.

[0014] Specifically, a rubber layer is provided on the side of the vibration plate facing the sealing cover to increase the rigidity of the vibration plate.

[0015] Specifically, the rubber layer is made of one or more of natural rubber, silicone rubber, fluororubber or chloroprene rubber.

[0016] Specifically, the vibration plate is made of a material with high electrical conductivity to ensure that it has excellent vibration characteristics and durability.

[0017] Specifically, the energized coil is wound with a high-conductivity wire, and the winding center vertically corresponds to the center of the magnetic field concentrator.

[0018] Specifically, insulating material is filled between the energized coils to prevent current short circuit.

[0019] Specifically, the ratio of the short bottom side of the trapezoidal cross section of the magnetic field concentrator to the length of the long bottom plate of the trapezoidal cross section is 1:4.

[0020] Specifically, a groove is provided on the vibration plate, and the shape and size of the groove are set based on the natural frequency corresponding to the sound radiation signal.

[0021] Specifically, the setting process of the vibration plate is as follows:

[0022] Step 1: Calculate the vibration modes and natural frequencies of each order of a specific vibration plate in a magnetically concentrated flat plate transducer;

[0023] Step 2: Select the corresponding frequency and mode node according to the characteristic requirements of the acoustic radiation signal;

[0024] Step 3: If the required frequency does not have a corresponding natural frequency, adjust the size or slot the vibration plate and repeat the modal calculation and frequency selection steps to ensure that the transducer can work effectively within the required frequency range;

[0025] Step 4: Align the top of the magnetic field concentrator with the modal node of the vibration plate to achieve optimal sound wave transmission.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] By setting a magnetic field concentrator, the magnetic field shape in the transducer is optimized, thereby improving the application performance of the transducer in ocean detection and communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of a magnetically concentrated flat-plate transducer based on the Boomer principle provided in this embodiment;

[0029] Figure 2A top view of the magnetically concentrated flat-plate transducer provided in this embodiment;

[0030] Figure 3 A schematic diagram of the winding of the energized coil provided in this embodiment;

[0031] Figure 4 A schematic structural diagram of the magnetic field concentrator provided in this embodiment;

[0032] Figure 5 Vibration mode diagrams of the vibration plate provided in this embodiment at different stages;

[0033] Figure 6 Performance analysis diagram for this embodiment without a magnetic field concentrator;

[0034] Figure 7 Performance analysis diagram of the magnetic field concentrator provided for this embodiment;

[0035] Figure 8 This is a graph showing the results before and after adjustment of the vibration plate provided in this embodiment;

[0036] In the figure, 1. outer shell; 2. vibration plate; 3. vibration plate positioner; 4. energized coil; 5. coil positioner; 6. magnetic field concentrator; 7. concentrator positioner; 8. fastening bolts; 9. sealing cover; 10. rubber layer; 11. sealing ring. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described 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. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] like Figure 1As shown, a magnetically concentrated flat-plate transducer based on the Boomer principle provided in this embodiment includes an outer shell 1 with a sealing cover 9 on the top, a coil positioner 5 and a powered coil 4 laid on the coil positioner 5 are provided at the bottom of the outer shell 1, and the powered coil 4 is provided with a magnetic field concentrator 6 and a vibration plate 2 in sequence facing the sealing cover 9. In this embodiment, a concentrator positioner 7 is used to provide support for the magnetic field concentrator 6 to ensure that the magnetic field concentrator 6 is suspended above the powered coil 4, and the vibration plate 2 is mounted above the magnetic field concentrator 6 through a vibration plate positioner 3 arranged in advance on the corresponding opening end face of the sealing cover 9.

[0039] The coil positioner 5 is used to adjust the distance between the energized coil 4 and the magnetic field concentrator 6 to optimize the magnetic field concentration efficiency generated by the magnetic field concentrator 6 on the energized coil 4, thereby maximizing the utilization of the magnetic field energy.

[0040] The concentrator positioner 7 is used to adjust the distance between the magnetic field concentrator 6 and the vibration plate 2 to optimize the secondary induced current density and magnetic field strength in the vibration plate 2, thereby improving the overall system performance.

[0041] In this embodiment, the vibration plate 2 is made of high-conductivity material to ensure that it has excellent vibration characteristics and durability. The thickness is 1 to 5 mm and the diameter is 1 to 1.2 times the diameter of the energized coil 4 to ensure full utilization of the magnetic field energy. More specifically, the high-conductivity material can be any one of copper, aluminum or aluminum alloy.

[0042] like Figure 2 , which is a top view of the magnetically concentrated flat-plate transducer provided in this embodiment, a rubber layer 10 is added on the upper portion of the vibration plate 2 to enhance the rigidity of the vibration plate 2 and improve its durability.

[0043] More specifically, the highly elastic waterproof material used in the rubber layer 10 can be any one of natural rubber, silicone rubber, fluororubber, and chloroprene rubber.

[0044] A sealing ring 11 is provided at the opening of the housing. The sealing ring 11 is made of pressure-resistant silicone rubber material to ensure good waterproof performance and adapt to the seabed environment.

[0045] The rubber layer 10 is fixed with a sealing cover 9 and fastening bolts, and a sealing ring 11 is added between the sealing cover 9 and the rubber layer 10 to ensure that the transducer has good waterproof performance.

[0046] like Figure 3 As shown, the energized coil provided in this embodiment is a planar spiral coil, and the winding center vertically corresponds to the center of the magnetic field concentrator 6.

[0047] like Figure 4Figure 1 shows a schematic diagram of the structure of a magnetic field concentrator provided in this embodiment. This magnetic field concentrator 6 is designed to effectively concentrate and optimize the magnetic field to improve the transducer's transmission efficiency. The component has parallel upper and lower surfaces, with the upper surface area being smaller than the lower surface. Radial notches are provided to interrupt the eddy current path, converge current on the lower surface onto the upper surface, and optimize magnetic field distribution. The thickness of the magnetic field concentrator should be at least equal to the skin depth of the operating current to prevent current cancellation and ensure that the induced magnetic field strength is not affected.

[0048] By adjusting the size of the radial opening slot of the magnetic field concentrator, the excitation position of the induced magnetic field can be changed to correspond to the nodes of the vibration mode of different orders of the vibration plate. The angle between the upper surface and the through hole should be acute to improve the magnetic concentration efficiency. This can maximize the amplitude at a specific vibration frequency and enhance the emission effect of the sound wave.

[0049] More specifically, the diameter of the central circular hole should not be too large to better address the insufficient magnetic field force at the center of the vibrating plate and improve magnetic field collection efficiency. Furthermore, for flat-plate magnetic field concentrators, when the diameter of the upper hole is smaller than that of the lower hole (forming an acute-angle structure), the current on the gap surface is more concentrated toward the working area, reducing leakage, increasing the effective current ratio, and achieving a more significant magnetic field collection effect. The smaller the ratio of the upper to lower surface area of ​​the magnetic field concentrator, the smaller the energy concentration area and the higher the peak electromagnetic force. However, when the ratio exceeds 1 / 4, energy loss increases significantly, and the increase in magnitude tends to be flat. Preferably, the upper surface area of ​​the magnetic field concentrator is 1 / 4 of the lower surface area to achieve good magnetic field concentration. The thickness of the magnetic field concentrator must be greater than the sum of the skin depths of the upper and lower surfaces, otherwise the currents on the upper and lower surfaces will cancel each other out, weakening the electromagnetic force. However, increasing the thickness increases eddy current losses and reduces magnetic field collection efficiency. Therefore, the thickness must be optimized to balance the skin effect and energy loss. The gap width affects the current path and magnetic field leakage. For the slits of the magnetic field concentrator, a narrow gap can reduce leakage current and concentrate the effective current; if the gap is wider, it will increase leakage magnetic flux and reduce the magnetic field collection effect.

[0050] For a magnetic field concentrator without slits, the current cannot be effectively conducted to the upper surface. In this case, the magnetic field concentrator acts as a shield and loses its magnetic field collection function.

[0051] In actual operation, when the coil is energized, an induced current is generated at the bottom of the magnetic field concentrator. Under the skin effect, this current converges to the top through the slot edge of the magnetic field concentrator, forming a new eddy current. At the corresponding position of the vibration plate, a secondary induced current is formed, which causes the vibration plate to vibrate and displace through the induced magnetic field, ultimately generating sound radiation. The efficiency of this process is affected by the design of the magnetic field concentrator, especially the size of the slot, the angle between the upper surface and the through-hole, and the ratio of the upper surface area to the lower surface area.

[0052] In this embodiment, the ratio of the short base of the trapezoidal cross section of the magnetic field concentrator to the long base length of the trapezoidal cross section is 1:4.

[0053] In this embodiment, in order to reduce the mass of the vibration plate 2 and adjust its resonant frequency, grooves can be formed on the vibration plate 2. The grooves can be circular, annular, or strip-shaped. The specific groove pattern is selected based on the desired vibration frequency and modal distribution. The specific process is as follows:

[0054] Step 1: Calculate the vibration modes and natural frequencies of the vibration plate in the magnetic concentrated flat plate transducer, such as Figure 5 The figure shows the first four vibration modes of the vibration plate, where Figure 5 (a) in the figure is a vibration mode of one stage. Figure 5 (b) in the figure is the second-stage vibration mode. Figure 5 (c) in the figure is the three-stage vibration mode. Figure 5 (d) in the figure is the four-stage vibration mode.

[0055] Step 2: Select the corresponding frequency and modal node based on the characteristic requirements of the acoustic radiation signal.

[0056] Step 3: If the required frequency does not have a corresponding natural frequency, the vibration plate is resized or slotted, and steps 1 and 2 are repeated. The shape of the slot can be diverse, including but not limited to circular, annular, and strip shapes.

[0057] Step 4: Place the top of the magnetic field concentrator in correspondence with the modal node position of the vibration plate, as shown in the following example: Figure 6 and Figure 7 As shown in Figure 2, after installing the magnetic field concentrator, the magnetic field strength is enhanced and concentrated at the required modal node position, where Figure 6 (a) is the curve of the radial component of magnetic induction intensity without adding a magnetic field concentrator. Figure 6 (b) is the curve of the axial component of magnetic induction intensity without adding a magnetic field concentrator. Figure 6 (c) is the total magnetic induction intensity curve without adding a magnetic field concentrator. Figure 6 (d) is the radial component curve of the current density without adding a magnetic field concentrator. Figure 7 (a) is the radial component curve of magnetic induction intensity with magnetic field concentrator. Figure 7 (b) is the curve of the axial component of magnetic induction intensity with a magnetic field concentrator. Figure 7 (c) is the total magnetic induction intensity curve with a magnetic field concentrator. Figure 7 (d) in the figure is a curve of the radial component of the current density with a magnetic field concentrator.

[0058] Step 5: After completing the assembly and fixing of other parts of the system, energize the coil 4 to excite the vibration plate 2 to generate sound radiation.

[0059] like Figure 8 As described above, it can be clearly seen that the frequency decreases and the intensity increases. Figure 8 (a) is the result curve before the vibration plate is adjusted. Figure 8 (b) in the figure is the result curve after the vibration plate is adjusted.

[0060] In summary, the magnetically concentrated flat-plate transducer based on the Boomer principle provided by the present invention has significant advantages over the existing technology. First, through optimized design, the emission efficiency of the transducer is improved, especially when excited at low frequencies, the radiation capacity of sound waves can be effectively enhanced. Secondly, the frequency modulation method enables the transducer to flexibly adjust the frequency to meet different detection needs, thereby broadening its application range. In addition, the transducer also has a high energy utilization rate. Through effective magnetic field concentration and energy transfer mechanism, it significantly improves energy utilization efficiency and reduces energy consumption. Finally, the reasonable structural design enhances the stability and reliability of the transducer in complex environments such as waves and tides, ensuring its performance in practical applications.

[0061] In addition, the terms "upper", "lower", "inner", "outer", "front", and "back" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the present invention.

[0062] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

[0063] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A magnetic concentrated flat-plate transducer based on the Boomer principle, characterized in that: It comprises an outer shell with a sealing cover on the top, and a coil positioner, a concentrator positioner, an energized coil and a magnetic field concentrator are provided at the bottom of the outer shell; The coil positioner is used to support the wound energized coil at the bottom of the outer shell, and the distance between the energized coil and the magnetic field concentrator is adjusted by the coil positioner; The concentrator positioner is used to suspend the magnetic field concentrator above the energized coil to ensure that there is a gap between the suspended magnetic field concentrator and the energized coil, and the distance between the magnetic field concentrator and the vibration plate is adjusted by the concentrator positioner; The opening ends of the outer shell corresponding to the sealing cover are provided with a vibration plate positioner for setting up the vibration plate above the magnetic field concentrator; The magnetic field concentrator is provided with radially open slots extending from the center outward, and the cross-section of the magnetic field concentrator along the direction from the energized coil to the sealing cover is a trapezoidal cross-section, wherein the side of the trapezoidal cross-section facing the energized coil is larger than the side of the trapezoidal cross-section facing the vibration plate, and the ratio of the short base of the trapezoidal cross-section to the long base of the trapezoidal cross-section of the magnetic field concentrator is 1:4; The vibration plate is provided with a groove, and the shape and size of the groove are set based on the natural frequency corresponding to the sound radiation signal.

2. The magnetic concentrated flat-plate transducer based on the Boomer principle according to claim 1, characterized in that: A rubber layer is provided on the side of the vibration plate facing the sealing cover.

3. The magnetic concentrated flat-plate transducer based on the Boomer principle according to claim 2, characterized in that: The rubber layer is made of one or more of natural rubber, silicone rubber, fluororubber or chloroprene rubber.

4. The magnetic concentrated flat-plate transducer based on the Boomer principle according to claim 1, characterized in that: The vibration plate is made of a material with high electrical conductivity.

5. The magnetic concentrated flat-plate transducer based on the Boomer principle according to claim 1, characterized in that: The energized coil is wound with a high-conductivity wire, and the winding center vertically corresponds to the center of the magnetic field concentrator.

6. The magnetic concentrated flat-plate transducer based on the Boomer principle according to claim 1 or 5, characterized in that: Insulating material is filled between the energized coils.

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