Magnetic centralized flat transducer based on Boomer principle

Abstract

The invention discloses a Boomer principle-based magnetic centralized flat transducer, which comprises an outer shell with a sealing cover at the top, and is characterized in that a coil positioner, a concentrator positioner, an electrified coil and a magnetic field concentrator are arranged at the bottom in the outer shell; the magnetic field concentrator is provided with a radial open slot penetrating up and down from the center to the outside, the cross section of the magnetic field concentrator in the direction from the electrified coil to the sealing cover is a trapezoidal cross section, and the side, facing the electrified coil, of the trapezoidal cross section is larger than the side, facing the vibration plate, of the trapezoidal cross section. According to the device provided by the invention, the electromagnetic sounding performance of the transducer can be improved, and the spectrum modulation capability is optimized, so that the application performance of the transducer in ocean exploration and communication is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of seabed terrain detection, and particularly relates to a magnetic centralized flat transducer based on the Boomer principle. Background Art

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

[0003] Existing electromagnetic transducers usually have a series of problems in practical applications. First, the transmission power is generally small, resulting in poor detection effects in long-distance detection and being difficult to meet the detection requirements of high sensitivity. Second, the spectral characteristics of traditional transducers are fixed and lack flexibility, and cannot be adjusted according to the requirements of different detection tasks. For example, in marine detection, the properties of the target object and environmental conditions vary greatly, and the transducer needs to have adjustable spectral characteristics to adapt to different acoustic wave propagation requirements.

[0004] In addition, the volume and weight of traditional transducers are usually large, which causes difficulties in deployment and operation in complex underwater environments. The large equipment not only increases the overall weight of the system but also limits its application potential in narrow spaces. More importantly, the energy utilization efficiency of existing transducers is generally not high, and the energy of the electromagnetic field cannot be fully utilized, restricting the performance of the overall system.

[0005] Patent document CN112289290A discloses a membrane-type electromagnetic transducer, which includes a cylinder body enclosing a watertight space, two membrane-type radiation members, and a sealing member; the membrane-type radiation member is formed by connecting a cylindrical portion and a circular ring portion, and the height of the cylindrical portion is greater than the height of the circular ring portion; a partition is fixedly arranged on the inner wall of the cylinder body, and excitation structures wound with drive coils are fixedly arranged on both side surfaces of the partition. An armature is fixedly arranged on the end surface of the cylindrical portion facing the partition, and the armature and the excitation structure located in the same sub-space are arranged opposite to each other in the axial direction of the cylinder body; the membrane-type electromagnetic transducer further includes K first fixing members for fixedly connecting the edge portion of the membrane-type radiation member to the cylinder body, where K≥3; a reinforcing member is arranged on the outer end surface of each membrane-type radiation member, the reinforcing member is arranged in the radial direction of the outer end surface of the membrane-type radiation member and / or the reinforcing member is a symmetric structure centered on the center of the outer end surface of the membrane-type radiation member, and the reinforcing member is fixedly connected to the membrane-type radiation member or is an integral structure.

[0006] Patent Document CN118539700A discloses a planar electromagnetic transducer, an energy harvesting device, and an energy harvesting method. The planar electromagnetic transducer includes an electromagnetic module, which comprises a housing, a coil group, a magnet group, and a magnet frame. A clamping strip is provided at the top of the magnet frame; a starting module, which includes a pressing block, a first wedge-shaped slider, and a second wedge-shaped slider that abut against both ends of the pressing block; a spring module includes a spring. The magnet frame can abut against the spring and keep the spring in a compressed state; a first twisting member and a second twisting member are arranged inside the housing. By providing the pressing block, the first wedge-shaped slider, the second wedge-shaped slider, the first twisting member, the second twisting member, the spring, and the clamping strip, when a downward pressure is applied to the pressing block, the vertical displacement of the pressing block can be 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 twisting member and the second twisting member through the starting module, realizing the pre-charging of potential energy and avoiding energy waste. Summary of the Invention

[0007] The object of the present invention is to provide a magnetic concentration flat transducer based on the Boomer principle, which can effectively enhance the radiation ability of sound waves when dealing with low-frequency excitation tasks.

[0008] To achieve the object of the present invention, the following technical solutions are provided: A magnetic concentration flat transducer based on the Boomer principle, which includes an outer housing with a sealing cover on the top. A coil locator, a concentrator locator, an energized coil, and a magnetic field concentrator are provided at the bottom inside the outer housing; The coil locator is used to support the coiled energized coil at the bottom inside the outer housing; The concentrator locator is used to suspend the magnetic field concentrator above the energized coil to ensure a gap is left between the suspended magnetic field concentrator and the energized coil; An opening end of the outer housing corresponding to the sealing cover is provided with a diaphragm locator for mounting the diaphragm above the magnetic field concentrator; The magnetic field concentrator is provided with a radially opening groove penetrating up and down from the center outwards. 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 diaphragm.

[0009] The present invention optimizes the magnetic field shape of the energized coil by setting a magnetic field concentrator between the energized coil and the diaphragm, and at the same time utilizes its structural characteristics and radially slots from the center outwards to interrupt the eddy current path, so that the current on the lower surface converges on the upper surface, optimizing the magnetic field concentration efficiency of the magnetic field concentrator on the coil generated magnetic field, thereby realizing the maximum utilization of magnetic field energy.

[0010] Specifically, a rubber layer is provided on the side of the diaphragm facing the sealing cover to increase the rigidity of the diaphragm.

[0011] Specifically, the rubber layer is made of one or more of natural rubber, silica gel, fluororubber or neoprene.

[0012] Specifically, the vibrating plate is made of a material with high electrical conductivity to ensure its excellent vibration characteristics and durability.

[0013] Specifically, the energized coil is wound with a high-conductivity wire, and the center of the winding is vertically corresponding to the center of the magnetic field concentrator.

[0014] Specifically, an insulating material is filled between the energized coils to prevent current short circuit.

[0015] Specifically, the ratio of the short bottom side to the long bottom side of the trapezoidal cross-section of the magnetic field concentrator is 1:4.

[0016] Specifically, grooves are provided on the vibrating plate, and the shape and size of the grooves are set based on the natural frequency corresponding to the acoustic radiation signal.

[0017] Specifically, the vibrating plate is set up as follows: Step 1: Calculate the vibration modes and natural frequencies of each order of a specific vibrating plate in the magnetic-concentrated flat transducer. Step 2: Select the corresponding frequencies and modal nodes according to the characteristic requirements of the acoustic radiation signal. Step 3: If there is no corresponding natural frequency for the required frequency, adjust the size of the vibrating plate or cut slots, and repeat the steps of modal calculation and frequency selection to ensure that the transducer can work effectively within the required frequency range. Step 4: Arrange the top of the magnetic field concentrator corresponding to the modal node position of the vibrating plate to achieve the best acoustic wave emission effect.

[0018] Compared with the prior art, the beneficial effects of the present invention are: By setting a magnetic field concentrator to optimize the magnetic field shape in the transducer, the application performance of the transducer in ocean exploration and communication is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the magnetic-concentrated flat transducer based on the Boomer principle provided in this embodiment; Figure 2 It is a top view of the magnetic-concentrated flat transducer provided in this embodiment; Figure 3 It is a winding schematic diagram of the energized coil provided in this embodiment; Figure 4 It is a schematic structural diagram of the magnetic field concentrator provided in this embodiment; Figure 5The vibration mode diagrams of the vibrating plate provided in this embodiment at different stages; Figure 6 The performance analysis diagram of the present embodiment without a magnetic field concentrator; Figure 7 The performance analysis diagram of the present embodiment with a magnetic field concentrator; Figure 8 The result curve diagram of the vibrating plate before and after adjustment provided in this embodiment; In the figure, 1. outer housing; 2. vibrating plate; 3. vibrating plate locator; 4. energized coil; 5. coil locator; 6. magnetic field concentrator; 7. concentrator locator; 8. fastening bolt; 9. sealing cover; 10. rubber layer; 11. sealing ring. Detailed implementation manners

[0020] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figure 1 shown, a magnetic field concentrated flat transducer based on the Boomer principle provided in this embodiment includes an outer housing 1 with a sealing cover 9 at the top. An inner bottom of the outer housing 1 is provided with a coil locator 5 and an energized coil 4 laid on the coil locator 5. A magnetic field concentrator 6 and a vibrating plate 2 are sequentially arranged in a direction facing the sealing cover 9. In this embodiment, a concentrator locator 7 is used to support the magnetic field concentrator 6 to ensure that the magnetic field concentrator 6 is suspended above the energized coil 4, and the vibrating plate 2 is erected above the magnetic field concentrator 6 through a vibrating plate locator 3 arranged in advance on a corresponding opening end face of the sealing cover 9.

[0022] The coil locator 7 is used to adjust the distance between the energized coil 4 and the magnetic field concentrator 6 to optimize the magnetic field concentration efficiency of the magnetic field concentrator 6 on the magnetic field generated by the energized coil 4, so as to maximize the utilization of magnetic field energy.

[0023] The concentrator locator 7 is used to adjust the distance between the magnetic field concentrator 6 and the vibrating plate 2 to optimize the secondary induced current density and magnetic field strength in the vibrating plate 2, so as to improve the overall system performance.

[0024] In this embodiment, the vibrating plate 2 is made of a material with high electrical conductivity to ensure excellent vibration characteristics and durability. Its thickness is 1 - 5 mm, and its diameter is 1 - 1.2 times the diameter of the energized coil 4 to ensure full utilization of the magnetic field energy. More specifically, the material with high electrical conductivity can be any one of copper, aluminum, or aluminum alloy.

[0025] As Figure 2 shown, it is a top view of the magnetic - concentrated flat transducer provided in this embodiment. A rubber layer 10 is added on the upper part of the vibrating plate 2 to enhance the rigidity of the vibrating plate 2 and improve its durability.

[0026] More specifically, the highly elastic waterproof material used for the rubber layer 10 can be any one of natural rubber, silicone rubber, fluororubber, or neoprene.

[0027] A sealing ring 11 is provided at the opening part 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.

[0028] Above the rubber layer 10, it is fixed using a sealing cover 9 and fastening bolts. 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.

[0029] As Figure 3 shown, the energized coil provided in this embodiment uses a planar spiral coil, and the winding center is vertically corresponding to the center of the magnetic field concentrator 6.

[0030] As Figure 4 shown, it is a structural schematic diagram of a magnetic field concentrator provided in this embodiment. The design of this magnetic field concentrator 6 aims to effectively concentrate and optimize the magnetic field to improve the emission efficiency of the transducer. This component has parallel upper and lower surfaces, and the area of the upper surface is smaller than that of the lower surface. Radial notches are opened on it to interrupt the eddy - current path and converge the current on the lower surface to the upper surface, optimizing the magnetic - field distribution. The thickness of the magnetic field concentrator should be at least equal to the skin depth of the working current to avoid current cancellation and ensure that the induced magnetic - field intensity is not affected.

[0031] By adjusting the size of the radial opening slots of the magnetic field concentrator, the excitation position of the induced magnetic field can be changed to correspond to the nodes of different - order vibration modes of the vibrating plate. The angle between the upper surface and the through - hole should be an acute angle to improve the magnetic - concentration efficiency. In this way, the amplitude at a specific vibration frequency can be maximized, enhancing the acoustic - wave emission effect.

[0032] More specifically, the diameter of the central circular hole should not be too large so as to better improve the insufficient magnetic field force at the center of the vibrating plate and enhance the magnetic collection efficiency. For a flat magnetic field concentrator, 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 flows more concentratedly towards the working area, reducing leakage and increasing the proportion of effective current, resulting in a more significant magnetic collection effect. The smaller the ratio of the upper surface area to the lower surface area of the magnetic field concentrator, the smaller the energy concentration area and the relatively higher the peak value of the electromagnetic force. However, when the ratio is greater than 1 / 4, the energy loss increases significantly and the increase rate tends to level off. Preferably, the upper surface area of the magnetic field concentrator is 1 / 4 of the lower surface area to achieve a good magnetic field concentration effect. The thickness of the magnetic field concentrator needs to 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 in the opposite direction, weakening the electromagnetic force. However, increasing the thickness will lead to an increase in eddy current loss and a decrease in magnetic collection efficiency. Therefore, the thickness needs to be optimized to balance the skin effect and energy loss. The gap width affects the current path and magnetic leakage. For the slit of the magnetic field concentrator, a narrow slit can reduce the leakage current and concentrate the effective current; if the slit is wider, it will increase the magnetic leakage and reduce the magnetic collection effect.

[0033] For a magnetic field concentrator without a slit, since the current cannot be effectively conducted to the upper surface, the magnetic field concentrator acts as a shield at this time and loses its magnetic collection function.

[0034] 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 slotted edge of the magnetic field concentrator to form a new eddy current. At the corresponding position of the vibrating plate, a secondary induced current is formed, and the vibration and displacement of the vibrating plate are caused 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.

[0035] In this embodiment, the ratio of the short bottom side length to the long bottom side length of the trapezoidal cross-section of the magnetic field concentrator is 1:4.

[0036] In this embodiment, in order to reduce the mass of the vibrating plate 2 and adjust its resonance frequency, the vibrating plate 2 can be slotted. The slotting forms include circular, circular ring-shaped, and strip-shaped. The specific slotting pattern is selected according to the required vibration frequency and modal distribution. The specific process is as follows: Step 1: Calculate the vibration modes and natural frequencies of each order of the vibrating plate in the magnetic-concentrating flat transducer, as Figure 5 shown are the first four vibration modes of the vibrating plate, where Figure 5 in (a) is the vibration mode of the first stage, Figure 5 in (b) is the vibration mode of the second stage, Figure 5 in (c) is the vibration mode of the third stage, Figure 5In (d), it is a four-stage vibration mode.

[0037] Step 2: According to the characteristic requirements of the acoustic radiation signal, select the corresponding frequency and modal nodes.

[0038] Step 3: If there is no corresponding natural frequency for the required frequency, adjust the size of the vibrating plate or make slots, and repeat Step 1 and Step 2. The shapes of the slots can be diversified, including but not limited to various forms such as circular, circular ring-shaped, and strip-shaped, etc.

[0039] Step 4: Arrange the top of the magnetic field concentrator corresponding to the modal node position of the vibrating plate, as Figure 6 and Figure 7 shown. After installing the magnetic field concentrator, the magnetic field intensity is enhanced and concentrated at the required modal node position. Among them, Figure 6 in (a) is the radial component curve graph of the magnetic induction intensity without adding the magnetic field concentrator, Figure 6 in (b) is the axial component curve graph of the magnetic induction intensity without adding the magnetic field concentrator, Figure 6 in (c) is the total magnetic induction intensity curve graph without adding the magnetic field concentrator, Figure 6 in (d) is the radial component curve graph of the current density without adding the magnetic field concentrator, Figure 7 in (a) is the radial component curve graph of the magnetic induction intensity with the magnetic field concentrator, Figure 7 in (b) is the axial component curve graph of the magnetic induction intensity with the magnetic field concentrator, Figure 7 in (c) is the total magnetic induction intensity curve graph with the magnetic field concentrator, Figure 7 in (d) is the radial component curve graph of the current density with the magnetic field concentrator.

[0040] Step 5: After completing the assembly and fixation of other parts of the system, energize the coil 4 to excite the vibrating plate 2 to generate acoustic radiation.

[0041] As Figure 8 described, it can be clearly seen that the frequency decreases and the intensity increases. Figure 8 In (a) is the result curve graph before adjusting the vibrating plate, Figure 8 in (b) is the result curve graph after adjusting the vibrating plate.

[0042] In summary, the magnetic centralized flat transducer based on the Boomer principle provided by the present invention has significant advantages over the prior art. First of all, through optimized design, the emission efficiency of the transducer is improved. Especially when excited at low frequencies, it can effectively enhance the radiation ability of sound waves. Secondly, the frequency modulation method enables the transducer to flexibly adjust the frequency to meet different detection requirements, thus broadening its application scope. In addition, the transducer also has high energy utilization efficiency. Through effective magnetic field concentration and energy transfer mechanisms, the energy utilization efficiency is significantly improved and the energy consumption is reduced. 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.

[0043] In addition, the terms "upper", "lower", "inner", "outer", "front", and "rear" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0044] Of course, the above are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes or modifications made according to 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.

[0045] Finally, it should be noted that the above embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, and are not intended to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes, or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A magnetic centralized flat transducer based on the Boomer principle, characterized in that, It includes a housing body with a sealing cover at the top. At the bottom inside the housing body, there are a coil locator, a concentrator locator, an energized coil, and a magnetic field concentrator; The coil locator is used to support the coiled energized coil at the bottom inside the housing body; The concentrator locator is used to suspend the magnetic field concentrator above the energized coil to ensure a gap is left between the suspended magnetic field concentrator and the energized coil; At the open end of the housing body corresponding to the sealing cover, there is a diaphragm locator for mounting the diaphragm above the magnetic field concentrator; The magnetic field concentrator is provided with a radially opening groove penetrating up and down from the center outwards. 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 diaphragm.

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

3. The magnetic centralized flat 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, silica gel, fluororubber, or neoprene.

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

5. The magnetic centralized flat transducer based on the Boomer principle according to claim 1, characterized in that, The energized coil is wound with a highly conductive wire, and the winding center is vertically corresponding to the center of the magnetic field concentrator.

6. The magnetic centralized flat transducer based on the Boomer principle according to claim 1 or 5, characterized in that, An insulating material is filled between the energized coils.

7. The magnetic centralized flat transducer based on the Boomer principle according to claim 1, characterized in that, The ratio of the length of the short bottom side to the length of the long bottom plate of the trapezoidal cross-section of the magnetic field concentrator is 1:

4.

8. The magnetic centralized flat transducer based on the Boomer principle according to claim 1, characterized in that, Grooves are provided on the diaphragm, and the shape and size of the grooves are set based on the natural frequency corresponding to the acoustic radiation signal.

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