A cylindrical electromagnetic transducer

Abstract

The present invention discloses a cylindrical electromagnetic transducer, comprising an outer shell and a vibration tube fixed in the outer shell; the vibration tube comprises a cylindrical shell and a fixing rod axially extending through the cylindrical shell, both ends of the fixing rod being fixed to the inner wall of the outer shell, the fixing rod being located in the cylindrical shell and wound with an energized coil and coaxially provided with a magnetic field concentrating mechanism, the magnetic field concentrating structure comprising a plurality of support rods arranged parallel to the fixing rod and a magnetic field concentrator, a plurality of support rods being arranged around the fixing rod to form an annular support frame, the magnetic field concentrator being sleeved on the annular support frame. Compared with traditional flat-plate electromagnetic transducers that have problems such as insufficient pressure resistance, non-compact structure, and low working efficiency under deep-sea high-pressure conditions, the device provided by the present invention has stronger pressure resistance and is suitable for detection environments under deep-sea high-pressure conditions.

Description

Technical Field

[0001] The present invention belongs to the field of deep-sea resource detection, and in particular relates to a cylindrical electromagnetic transducer. Background Art

[0002] In marine environments, sound waves are a crucial tool for marine communication, detection, and monitoring, suitable for transmitting information and detecting targets. Traditional electromagnetic transducers utilize flat coils to excite circular diaphragms, radiating sound from one or both sides. When used in high-pressure environments, the vibration displacement of traditional flat electromagnetic transducers is significantly suppressed, thereby reducing the sound source level.

[0003] Conventional flat-plate electromagnetic transducers have limited pressure resistance, making them susceptible to deformation and even damage in the high-pressure environments of deep seas, impacting their performance and reliability. Furthermore, to achieve a certain sound radiation area, flat-plate transducers are typically large, making their structure less compact.

[0004] Patent document CN117805881A discloses a deepwater Boomer source transducer and method, which includes a base, a transmitting plate, a pressurized cavity and a coil; the coil is arranged in a groove of the base; the edge of the transmitting plate is fixed to the base, and the coil corresponds to the middle of the transmitting plate. When the coil is energized, an induced current is generated inside the transmitting plate, and the two close ends generate the same magnetic field, causing the transmitting plate to radiate outward; the transmitting plate and the base are sealed so that the depression of the transmitting plate forms a pressurized cavity, and the base is provided with a pressurization port and a pressure relief port connected to the pressurized cavity, and the pressurization port and the pressure relief port are respectively connected to the external pressurization pipeline and the pressure relief pipeline; a first pressure sensor is provided in the pressurized cavity, and a second pressure sensor is provided outside the base.

[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. Summary of the Invention

[0006] The purpose of the present invention is to provide a cylindrical electromagnetic transducer. Compared with traditional flat-plate electromagnetic transducers that have problems such as insufficient pressure resistance, non-compact structure and low working efficiency under deep-sea high-pressure conditions, this device has stronger pressure resistance and is suitable for detection environments under deep-sea high-pressure conditions.

[0007] In order to achieve the purpose of the present invention, the following technical solution is provided: a cylindrical electromagnetic transducer, comprising an outer shell and a vibration tube fixed in the outer shell;

[0008] The vibration tube includes a cylindrical shell and a fixing rod that penetrates the cylindrical shell axially along the cylindrical shell. Both ends of the fixing rod are fixed to the inner wall of the outer shell. The fixing rod is located in the cylindrical shell and is wound with an energized coil and is coaxially provided with a magnetic field concentration mechanism. The magnetic field concentration structure includes several support rods arranged parallel to the fixing rod and a magnetic field concentrator. Several support rods are arranged around the fixing rod to form an annular support frame, and the magnetic field concentrator is sleeved on the annular support frame.

[0009] The present invention adopts a cylindrical spiral coil and a cylindrical vibration structure to realize electromagnetic force driving the radial vibration of the cylinder to generate sound waves.

[0010] Specifically, the outer shell is made of pressure-resistant sound-transmitting material, which mainly has good sound wave conduction characteristics and pressure resistance.

[0011] Specifically, the outer shell is filled with a coupling acoustic impedance medium to match the acoustic impedance of the transducer, thereby ensuring effective transmission of sound waves.

[0012] Specifically, an iron core hollow tube is provided between the fixing rod and the energized coil, and the inner tube wall of the iron core hollow tube is sleeved and fixed to the outer peripheral surface of the fixing rod.

[0013] Specifically, both the inner and outer surfaces of the cylindrical shell are provided with insulating layers to prevent high voltage discharge breakdown.

[0014] Specifically, the inner wall of the cylindrical shell is provided with a groove, and the length of the groove is smaller than the axial length of the cylindrical shell, so as to adjust its vibration mode and displacement amplitude and optimize the sound wave radiation effect.

[0015] Specifically, there are multiple grooves, and the multiple grooves are arranged along the circumference of the inner wall of the cylindrical shell, and the inner wall of the cylindrical shell retains a closed induction current loop along the circumference, ensuring that an effective induction current loop can still be formed when grooves of various shapes are opened, thereby ensuring the stability and efficiency of the transducer during operation.

[0016] Specifically, the fixing rod is provided with a pair of retaining rings for tightening the energized coil, so as to avoid the problem of the energized coil falling off due to vibration during the operation of the vibration tube.

[0017] Specifically, the vibration tube is further provided with a control unit and a power supply unit. The control unit generates corresponding control instructions according to a preset vibration frequency requirement, and the power supply unit supplies power to the energized coil according to the received control instructions.

[0018] Specifically, the magnetic field concentrator adopts a non-closed-loop circular ring with a slit, and is in sliding contact with the annular support frame through the inner ring wall of the non-closed-loop circular ring. The ratio of the length of the radial cross section of the non-closed-loop circular ring close to the cylindrical shell to the length of the radial cross section close to the fixed rod is 1:4.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The cylindrical structure has stronger pressure resistance and can maintain stable performance in deep-sea high-pressure environments, thereby improving the reliability and service life of the device.

[0021] The cylindrical structure can be designed to be more compact while maintaining the same radiation area, making it easier to integrate and apply in situations with strict space requirements;

[0022] Compared with the flat structure, the cylindrical structure has more uniform deformation and stress in the deep-sea high-pressure environment, so it can better adapt to the deep-sea environment and is more conducive to the manufacturing process of the corresponding pressure-resistant and sound-transparent shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a half-section structure of a cylindrical electromagnetic transducer provided in this embodiment;

[0024] Figure 2 A schematic cross-sectional view of the vibration tube provided in this embodiment;

[0025] Figure 3 A schematic structural diagram of the magnetic field concentration mechanism provided in this embodiment;

[0026] Figure 4 A schematic structural diagram of a cylindrical shell provided in this embodiment;

[0027] Figure 5 A schematic diagram of the magnetic field intensity streamlines and current density arrow cloud diagram provided in this embodiment;

[0028] Figure 6 A distribution curve diagram of magnetic induction intensity and current density along the axis of the vibrating tube provided in this embodiment;

[0029] In the figure, 1. energized coil; 2. cylindrical shell; 3. outer shell; 5. end cover; 6. magnetic field concentrator; 7. iron core hollow tube; 8. support rod; 9. rubber layer; 10. fixing rod; 11. retaining ring. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figure 1 and Figure 2 As shown, a cylindrical electromagnetic transducer provided by this embodiment includes an outer shell 3 and a vibration tube fixed in the outer shell 3. In this embodiment, the outer shell 3 adopts a cylindrical design and uses a pressure-resistant and sound-transmitting material (such as a carbon fiber composite material or a glass fiber composite material) with good sound wave conduction characteristics and pressure resistance. The interior of the outer shell 3 is filled with a coupling medium (such as seawater, insulating oil or gel) to match the acoustic impedance of the transducer, thereby ensuring the effective transmission of sound waves, and the two ends are sealed by end caps 5.

[0032] Compared to traditional flat-plate designs, its cylindrical structure demonstrates greater stability in deep-sea high-pressure environments, thereby enhancing equipment reliability and service life. Furthermore, while maintaining the same sound radiation area, the cylindrical design is more compact, making it suitable for space-constrained applications. Furthermore, its more uniform distribution of force and deformation under high-pressure conditions helps it adapt to complex deep-sea environments and optimizes the manufacturing process for pressure-resistant, sound-transparent enclosures.

[0033] More specifically, the vibration tube includes a cylindrical shell 2 and a fixing rod 10 axially extending through the cylindrical shell 2 . Both ends of the fixing rod 10 are fixed to the end caps 5 of the outer shell 3 to ensure that the vibration tube is fixed in the outer shell 3 .

[0034] The fixing rod 10 is located in the cylindrical shell 2 and is wound with the energized coil 1 and is coaxially provided with a magnetic field concentration mechanism, such as Figure 3 The figure shows a schematic structural diagram of the magnetic field concentrating mechanism, which includes a plurality of support rods 8 arranged parallel to the fixed rod 10 and a magnetic field concentrator 6. The plurality of support rods 8 are arranged around the fixed rod 10 to form an annular support frame, and the magnetic field concentrator 6 is sleeved on the annular support frame.

[0035] In this embodiment, the magnetic field concentrator 6 adopts a non-closed circular ring, and is in sliding contact with the annular bracket through the inner ring wall of the non-closed circular ring. More specifically, the ratio of the length of the radial cross section of the non-closed circular ring close to the cylindrical shell 2 to the length of the radial cross section close to the fixing rod 10 is 1:4, wherein the slit of the non-closed circular ring can form a current loop inside and outside the circular ring surface.

[0036] A pair of retaining rings 11 are provided on the fixing rod 10 , through which the energized coil 1 wound on the fixing rod 10 can be supported, so as to prevent the energized coil from falling off due to vibration during operation of the vibration tube.

[0037] In this embodiment, a plurality of magnetic field concentrators 6 are installed on the annular support frame, and the resonance position of the final vibrating tube is adjusted by changing the spacing between the magnetic field concentrators.

[0038] In this embodiment, an iron core hollow tube 7 is provided between the fixing rod 10 and the energized coil 1 , and the inner tube wall of the iron core hollow tube 7 is sleeved and fixed to the outer circumference of the fixing rod 10 .

[0039] like Figure 4 As shown, the cylindrical shell 2 mentioned in this embodiment is provided with a groove inside, and the shape of the groove includes one of a circle, annular ring or strip, so as to adjust the vibration mode, displacement amplitude and equipment weight of the final vibration tube.

[0040] In addition, a plurality of grooves are provided in the cylindrical shell 2, but the length of the grooves is less than the axial length of the cylindrical shell 2, thereby ensuring that the cylindrical shell 2 retains a closed induction current loop along the circumferential direction, ensuring that an effective induction current loop can still be formed in the case of grooves of various shapes, and ensuring the stability and efficiency of the transducer during operation.

[0041] An insulating layer is provided between the cylindrical shell 2 and the energized coil 1 to prevent high voltage discharge breakdown. In addition, the outer side of the cylindrical shell 2 can be covered with a rubber layer 9 to isolate the cylindrical shell 2 from the outer shell 3.

[0042] The cylindrical shell 2 is in the shape of a hollow tube and is coaxial with the energized coil 1. Grooves of various shapes (such as circular, annular, and strip-shaped) can be opened on its surface to adjust its vibration mode and displacement amplitude and optimize the sound wave radiation effect.

[0043] The vibrating tube provided in the above embodiment operates as follows: When a pulsed current or alternating current flows through the energized coil 1, an induced current is generated within the vibrating tube according to Lenz's law. According to the Biot-Savart law, the magnetic induction intensity (dB) generated by the current element Idl in the coil at a point P in space is proportional to the magnitude of the current element Idl and inversely proportional to the square of the distance between the current element Idl and point P. This causes the vibrating plate to vibrate due to the Lorentz force, resulting in acoustic radiation.

[0044] That is, when the energized coil 1 is energized, a magnetic field is formed, causing the vibration tube to vibrate under the action of the Lorentz force, thereby generating sound radiation. The direction of the magnetic field generated inside is coaxial with the vibration tube.

[0045] like Figure 5 As shown, Figure 5 (a) in the figure is the magnetic field intensity streamline and the current density arrow cloud diagram when there is no magnetic field concentrating mechanism, (b) in the figure 5 is the magnetic field intensity streamline and the current density arrow cloud diagram when there is one magnetic field concentrator, and (c) in the figure 5 is the magnetic field intensity streamline and the current density arrow cloud diagram when there are three magnetic field concentrators.

[0046] Depend on Figure 5 From (a) in the figure, it can be seen that the magnetic fields on both sides are arc-shaped, and there is basically no local strong magnetic field, which makes it impossible for the vibration tube to achieve a large volume change during operation.

[0047] Depend on Figure 5 From (b) in the figure, we can see that the magnetic fields on both sides initially form a local strong magnetic field. In actual work, this can increase the force on the vibrating tube during its reverse deformation, and can also achieve a large volume change.

[0048] Depend on Figure 5 From (c) in the figure, we can see that the magnetic fields on both sides form a relatively complete local strong magnetic field. In actual work, this is manifested as the vibration tube being able to achieve a large volume change, thereby being able to adapt to a wider range of resonant frequencies.

[0049] like Figure 6 As shown, Figure 6 (a) is the distribution curve of magnetic induction intensity along the axis of the vibrating tube. Figure 6 (b) is the distribution curve of current density along the axis of the vibrating tube.

[0050] Depend on Figure 6 As can be seen from the two graphs, adding a magnetic field concentrator can effectively increase the magnetic induction intensity in a specific area and ensure that the current density in a specific area increases.

[0051] In summary, the present invention, based on the above-mentioned design, enables the magnetic field concentrator to move freely outside the energized coil, thereby achieving adjustment of the resonant position. By changing the distance between the magnetic field concentrator and the energized coil, the resonant frequency can be affected. The magnetic field concentrator can be mounted on an annular support frame to achieve precise adjustment of the resonant position. The annular support frame can be a linear support frame or a curved support frame, depending on the required adjustment range and accuracy. This design enables the transducer to adapt to different working environments and frequency requirements, improving its flexibility and reliability. In addition, the magnetic field concentrator can be designed with different shapes and sizes to accommodate different resonant frequencies and magnetic field strengths.

[0052] 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.

[0053] 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.

[0054] 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 cylindrical electromagnetic transducer, characterized in that: It includes an outer shell and a vibration tube fixed in the outer shell; The vibration tube includes a cylindrical shell and a fixing rod that penetrates the cylindrical shell axially along the cylindrical shell, the two ends of the fixing rod are fixed to the inner wall of the shell, the fixing rod is located in the cylindrical shell and is wound with an energized coil and is coaxially provided with a magnetic field concentrating mechanism, the magnetic field concentrating structure includes a plurality of support rods arranged parallel to the fixing rod and a magnetic field concentrator, the plurality of support rods are arranged around the fixing rod to form an annular support frame, and the magnetic field concentrator is sleeved on the annular support frame; The inner wall of the cylindrical shell is provided with a groove, and the length of the groove is smaller than the axial length of the cylindrical shell; There are multiple grooves, and the multiple grooves are arranged along the circumference of the inner wall of the cylindrical shell, and the inner wall of the cylindrical shell retains a closed induction current loop along the circumference; The magnetic field concentrator adopts a non-closed-loop circular ring with a slit, and is in sliding contact with the annular support frame through the inner ring wall of the non-closed-loop circular ring. The ratio of the length of the radial cross section of the non-closed-loop circular ring close to the cylindrical shell to the length of the radial cross section close to the fixed rod is 1:

4.

2. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The outer shell is made of pressure-resistant sound-transmitting material.

3. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The outer shell is filled with a coupling acoustic impedance medium.

4. The cylindrical electromagnetic transducer according to claim 1, characterized in that: There are a plurality of magnetic field concentrators, which are arranged at intervals along the axial direction of the iron core hollow tube.

5. The cylindrical electromagnetic transducer according to claim 1, characterized in that: An iron core hollow tube is provided between the fixing rod and the energized coil, and the inner tube wall of the iron core hollow tube is sleeved and fixed to the outer peripheral surface of the fixing rod.

6. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The fixing rod is provided with a pair of retaining rings for tightening the energized coil.

7. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The vibration tube is further provided with a control unit and a power supply unit. The control unit generates corresponding control instructions according to the preset vibration frequency requirement, and the power supply unit supplies power to the energized coil according to the received control instructions.

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